1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * Portions of this source code were derived from Berkeley 4.3 BSD 31 * under license from the Regents of the University of California. 32 */ 33 34 #pragma ident "%Z%%M% %I% %E% SMI" 35 36 #include <sys/types.h> 37 #include <sys/t_lock.h> 38 #include <sys/ksynch.h> 39 #include <sys/param.h> 40 #include <sys/time.h> 41 #include <sys/systm.h> 42 #include <sys/sysmacros.h> 43 #include <sys/resource.h> 44 #include <sys/signal.h> 45 #include <sys/cred.h> 46 #include <sys/user.h> 47 #include <sys/buf.h> 48 #include <sys/vfs.h> 49 #include <sys/vfs_opreg.h> 50 #include <sys/vnode.h> 51 #include <sys/proc.h> 52 #include <sys/disp.h> 53 #include <sys/file.h> 54 #include <sys/fcntl.h> 55 #include <sys/flock.h> 56 #include <sys/atomic.h> 57 #include <sys/kmem.h> 58 #include <sys/uio.h> 59 #include <sys/dnlc.h> 60 #include <sys/conf.h> 61 #include <sys/mman.h> 62 #include <sys/pathname.h> 63 #include <sys/debug.h> 64 #include <sys/vmsystm.h> 65 #include <sys/cmn_err.h> 66 #include <sys/filio.h> 67 #include <sys/policy.h> 68 69 #include <sys/fs/ufs_fs.h> 70 #include <sys/fs/ufs_lockfs.h> 71 #include <sys/fs/ufs_filio.h> 72 #include <sys/fs/ufs_inode.h> 73 #include <sys/fs/ufs_fsdir.h> 74 #include <sys/fs/ufs_quota.h> 75 #include <sys/fs/ufs_log.h> 76 #include <sys/fs/ufs_snap.h> 77 #include <sys/fs/ufs_trans.h> 78 #include <sys/fs/ufs_panic.h> 79 #include <sys/fs/ufs_bio.h> 80 #include <sys/dirent.h> /* must be AFTER <sys/fs/fsdir.h>! */ 81 #include <sys/errno.h> 82 #include <sys/fssnap_if.h> 83 #include <sys/unistd.h> 84 #include <sys/sunddi.h> 85 86 #include <sys/filio.h> /* _FIOIO */ 87 88 #include <vm/hat.h> 89 #include <vm/page.h> 90 #include <vm/pvn.h> 91 #include <vm/as.h> 92 #include <vm/seg.h> 93 #include <vm/seg_map.h> 94 #include <vm/seg_vn.h> 95 #include <vm/seg_kmem.h> 96 #include <vm/rm.h> 97 #include <sys/swap.h> 98 99 #include <fs/fs_subr.h> 100 101 #include <sys/fs/decomp.h> 102 103 static struct instats ins; 104 105 static int ufs_getpage_ra(struct vnode *, u_offset_t, struct seg *, caddr_t); 106 static int ufs_getpage_miss(struct vnode *, u_offset_t, size_t, struct seg *, 107 caddr_t, struct page **, size_t, enum seg_rw, int); 108 static int ufs_open(struct vnode **, int, struct cred *, caller_context_t *); 109 static int ufs_close(struct vnode *, int, int, offset_t, struct cred *, 110 caller_context_t *); 111 static int ufs_read(struct vnode *, struct uio *, int, struct cred *, 112 struct caller_context *); 113 static int ufs_write(struct vnode *, struct uio *, int, struct cred *, 114 struct caller_context *); 115 static int ufs_ioctl(struct vnode *, int, intptr_t, int, struct cred *, 116 int *, caller_context_t *); 117 static int ufs_getattr(struct vnode *, struct vattr *, int, struct cred *, 118 caller_context_t *); 119 static int ufs_setattr(struct vnode *, struct vattr *, int, struct cred *, 120 caller_context_t *); 121 static int ufs_access(struct vnode *, int, int, struct cred *, 122 caller_context_t *); 123 static int ufs_lookup(struct vnode *, char *, struct vnode **, 124 struct pathname *, int, struct vnode *, struct cred *, 125 caller_context_t *, int *, pathname_t *); 126 static int ufs_create(struct vnode *, char *, struct vattr *, enum vcexcl, 127 int, struct vnode **, struct cred *, int, 128 caller_context_t *, vsecattr_t *); 129 static int ufs_remove(struct vnode *, char *, struct cred *, 130 caller_context_t *, int); 131 static int ufs_link(struct vnode *, struct vnode *, char *, struct cred *, 132 caller_context_t *, int); 133 static int ufs_rename(struct vnode *, char *, struct vnode *, char *, 134 struct cred *, caller_context_t *, int); 135 static int ufs_mkdir(struct vnode *, char *, struct vattr *, struct vnode **, 136 struct cred *, caller_context_t *, int, vsecattr_t *); 137 static int ufs_rmdir(struct vnode *, char *, struct vnode *, struct cred *, 138 caller_context_t *, int); 139 static int ufs_readdir(struct vnode *, struct uio *, struct cred *, int *, 140 caller_context_t *, int); 141 static int ufs_symlink(struct vnode *, char *, struct vattr *, char *, 142 struct cred *, caller_context_t *, int); 143 static int ufs_readlink(struct vnode *, struct uio *, struct cred *, 144 caller_context_t *); 145 static int ufs_fsync(struct vnode *, int, struct cred *, caller_context_t *); 146 static void ufs_inactive(struct vnode *, struct cred *, caller_context_t *); 147 static int ufs_fid(struct vnode *, struct fid *, caller_context_t *); 148 static int ufs_rwlock(struct vnode *, int, caller_context_t *); 149 static void ufs_rwunlock(struct vnode *, int, caller_context_t *); 150 static int ufs_seek(struct vnode *, offset_t, offset_t *, caller_context_t *); 151 static int ufs_frlock(struct vnode *, int, struct flock64 *, int, offset_t, 152 struct flk_callback *, struct cred *, 153 caller_context_t *); 154 static int ufs_space(struct vnode *, int, struct flock64 *, int, offset_t, 155 cred_t *, caller_context_t *); 156 static int ufs_getpage(struct vnode *, offset_t, size_t, uint_t *, 157 struct page **, size_t, struct seg *, caddr_t, 158 enum seg_rw, struct cred *, caller_context_t *); 159 static int ufs_putpage(struct vnode *, offset_t, size_t, int, struct cred *, 160 caller_context_t *); 161 static int ufs_putpages(struct vnode *, offset_t, size_t, int, struct cred *); 162 static int ufs_map(struct vnode *, offset_t, struct as *, caddr_t *, size_t, 163 uchar_t, uchar_t, uint_t, struct cred *, caller_context_t *); 164 static int ufs_addmap(struct vnode *, offset_t, struct as *, caddr_t, size_t, 165 uchar_t, uchar_t, uint_t, struct cred *, caller_context_t *); 166 static int ufs_delmap(struct vnode *, offset_t, struct as *, caddr_t, size_t, 167 uint_t, uint_t, uint_t, struct cred *, caller_context_t *); 168 static int ufs_poll(vnode_t *, short, int, short *, struct pollhead **, 169 caller_context_t *); 170 static int ufs_dump(vnode_t *, caddr_t, offset_t, offset_t, 171 caller_context_t *); 172 static int ufs_l_pathconf(struct vnode *, int, ulong_t *, struct cred *, 173 caller_context_t *); 174 static int ufs_pageio(struct vnode *, struct page *, u_offset_t, size_t, int, 175 struct cred *, caller_context_t *); 176 static int ufs_dumpctl(vnode_t *, int, offset_t *, caller_context_t *); 177 static daddr32_t *save_dblks(struct inode *, struct ufsvfs *, daddr32_t *, 178 daddr32_t *, int, int); 179 static int ufs_getsecattr(struct vnode *, vsecattr_t *, int, struct cred *, 180 caller_context_t *); 181 static int ufs_setsecattr(struct vnode *, vsecattr_t *, int, struct cred *, 182 caller_context_t *); 183 extern int as_map_locked(struct as *, caddr_t, size_t, int ((*)()), void *); 184 185 /* 186 * For lockfs: ulockfs begin/end is now inlined in the ufs_xxx functions. 187 * 188 * XXX - ULOCKFS in fs_pathconf and ufs_ioctl is not inlined yet. 189 */ 190 struct vnodeops *ufs_vnodeops; 191 192 /* NOTE: "not blkd" below means that the operation isn't blocked by lockfs */ 193 const fs_operation_def_t ufs_vnodeops_template[] = { 194 VOPNAME_OPEN, { .vop_open = ufs_open }, /* not blkd */ 195 VOPNAME_CLOSE, { .vop_close = ufs_close }, /* not blkd */ 196 VOPNAME_READ, { .vop_read = ufs_read }, 197 VOPNAME_WRITE, { .vop_write = ufs_write }, 198 VOPNAME_IOCTL, { .vop_ioctl = ufs_ioctl }, 199 VOPNAME_GETATTR, { .vop_getattr = ufs_getattr }, 200 VOPNAME_SETATTR, { .vop_setattr = ufs_setattr }, 201 VOPNAME_ACCESS, { .vop_access = ufs_access }, 202 VOPNAME_LOOKUP, { .vop_lookup = ufs_lookup }, 203 VOPNAME_CREATE, { .vop_create = ufs_create }, 204 VOPNAME_REMOVE, { .vop_remove = ufs_remove }, 205 VOPNAME_LINK, { .vop_link = ufs_link }, 206 VOPNAME_RENAME, { .vop_rename = ufs_rename }, 207 VOPNAME_MKDIR, { .vop_mkdir = ufs_mkdir }, 208 VOPNAME_RMDIR, { .vop_rmdir = ufs_rmdir }, 209 VOPNAME_READDIR, { .vop_readdir = ufs_readdir }, 210 VOPNAME_SYMLINK, { .vop_symlink = ufs_symlink }, 211 VOPNAME_READLINK, { .vop_readlink = ufs_readlink }, 212 VOPNAME_FSYNC, { .vop_fsync = ufs_fsync }, 213 VOPNAME_INACTIVE, { .vop_inactive = ufs_inactive }, /* not blkd */ 214 VOPNAME_FID, { .vop_fid = ufs_fid }, 215 VOPNAME_RWLOCK, { .vop_rwlock = ufs_rwlock }, /* not blkd */ 216 VOPNAME_RWUNLOCK, { .vop_rwunlock = ufs_rwunlock }, /* not blkd */ 217 VOPNAME_SEEK, { .vop_seek = ufs_seek }, 218 VOPNAME_FRLOCK, { .vop_frlock = ufs_frlock }, 219 VOPNAME_SPACE, { .vop_space = ufs_space }, 220 VOPNAME_GETPAGE, { .vop_getpage = ufs_getpage }, 221 VOPNAME_PUTPAGE, { .vop_putpage = ufs_putpage }, 222 VOPNAME_MAP, { .vop_map = ufs_map }, 223 VOPNAME_ADDMAP, { .vop_addmap = ufs_addmap }, /* not blkd */ 224 VOPNAME_DELMAP, { .vop_delmap = ufs_delmap }, /* not blkd */ 225 VOPNAME_POLL, { .vop_poll = ufs_poll }, /* not blkd */ 226 VOPNAME_DUMP, { .vop_dump = ufs_dump }, 227 VOPNAME_PATHCONF, { .vop_pathconf = ufs_l_pathconf }, 228 VOPNAME_PAGEIO, { .vop_pageio = ufs_pageio }, 229 VOPNAME_DUMPCTL, { .vop_dumpctl = ufs_dumpctl }, 230 VOPNAME_GETSECATTR, { .vop_getsecattr = ufs_getsecattr }, 231 VOPNAME_SETSECATTR, { .vop_setsecattr = ufs_setsecattr }, 232 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 233 NULL, NULL 234 }; 235 236 #define MAX_BACKFILE_COUNT 9999 237 238 /* 239 * Created by ufs_dumpctl() to store a file's disk block info into memory. 240 * Used by ufs_dump() to dump data to disk directly. 241 */ 242 struct dump { 243 struct inode *ip; /* the file we contain */ 244 daddr_t fsbs; /* number of blocks stored */ 245 struct timeval32 time; /* time stamp for the struct */ 246 daddr32_t dblk[1]; /* place holder for block info */ 247 }; 248 249 static struct dump *dump_info = NULL; 250 251 /* 252 * Previously there was no special action required for ordinary files. 253 * (Devices are handled through the device file system.) 254 * Now we support Large Files and Large File API requires open to 255 * fail if file is large. 256 * We could take care to prevent data corruption 257 * by doing an atomic check of size and truncate if file is opened with 258 * FTRUNC flag set but traditionally this is being done by the vfs/vnode 259 * layers. So taking care of truncation here is a change in the existing 260 * semantics of VOP_OPEN and therefore we chose not to implement any thing 261 * here. The check for the size of the file > 2GB is being done at the 262 * vfs layer in routine vn_open(). 263 */ 264 265 /* ARGSUSED */ 266 static int 267 ufs_open(struct vnode **vpp, int flag, struct cred *cr, caller_context_t *ct) 268 { 269 return (0); 270 } 271 272 /*ARGSUSED*/ 273 static int 274 ufs_close(struct vnode *vp, int flag, int count, offset_t offset, 275 struct cred *cr, caller_context_t *ct) 276 { 277 cleanlocks(vp, ttoproc(curthread)->p_pid, 0); 278 cleanshares(vp, ttoproc(curthread)->p_pid); 279 280 /* 281 * Push partially filled cluster at last close. 282 * ``last close'' is approximated because the dnlc 283 * may have a hold on the vnode. 284 * Checking for VBAD here will also act as a forced umount check. 285 */ 286 if (vp->v_count <= 2 && vp->v_type != VBAD) { 287 struct inode *ip = VTOI(vp); 288 if (ip->i_delaylen) { 289 ins.in_poc.value.ul++; 290 (void) ufs_putpages(vp, ip->i_delayoff, ip->i_delaylen, 291 B_ASYNC | B_FREE, cr); 292 ip->i_delaylen = 0; 293 } 294 } 295 296 return (0); 297 } 298 299 /*ARGSUSED*/ 300 static int 301 ufs_read(struct vnode *vp, struct uio *uiop, int ioflag, struct cred *cr, 302 struct caller_context *ct) 303 { 304 struct inode *ip = VTOI(vp); 305 struct ufsvfs *ufsvfsp; 306 struct ulockfs *ulp = NULL; 307 int error = 0; 308 int intrans = 0; 309 310 ASSERT(RW_READ_HELD(&ip->i_rwlock)); 311 312 /* 313 * Mandatory locking needs to be done before ufs_lockfs_begin() 314 * and TRANS_BEGIN_SYNC() calls since mandatory locks can sleep. 315 */ 316 if (MANDLOCK(vp, ip->i_mode)) { 317 /* 318 * ufs_getattr ends up being called by chklock 319 */ 320 error = chklock(vp, FREAD, uiop->uio_loffset, 321 uiop->uio_resid, uiop->uio_fmode, ct); 322 if (error) 323 goto out; 324 } 325 326 ufsvfsp = ip->i_ufsvfs; 327 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_READ_MASK); 328 if (error) 329 goto out; 330 331 /* 332 * In the case that a directory is opened for reading as a file 333 * (eg "cat .") with the O_RSYNC, O_SYNC and O_DSYNC flags set. 334 * The locking order had to be changed to avoid a deadlock with 335 * an update taking place on that directory at the same time. 336 */ 337 if ((ip->i_mode & IFMT) == IFDIR) { 338 339 rw_enter(&ip->i_contents, RW_READER); 340 error = rdip(ip, uiop, ioflag, cr); 341 rw_exit(&ip->i_contents); 342 343 if (error) { 344 if (ulp) 345 ufs_lockfs_end(ulp); 346 goto out; 347 } 348 349 if (ulp && (ioflag & FRSYNC) && (ioflag & (FSYNC | FDSYNC)) && 350 TRANS_ISTRANS(ufsvfsp)) { 351 rw_exit(&ip->i_rwlock); 352 TRANS_BEGIN_SYNC(ufsvfsp, TOP_READ_SYNC, TOP_READ_SIZE, 353 error); 354 ASSERT(!error); 355 TRANS_END_SYNC(ufsvfsp, error, TOP_READ_SYNC, 356 TOP_READ_SIZE); 357 rw_enter(&ip->i_rwlock, RW_READER); 358 } 359 } else { 360 /* 361 * Only transact reads to files opened for sync-read and 362 * sync-write on a file system that is not write locked. 363 * 364 * The ``not write locked'' check prevents problems with 365 * enabling/disabling logging on a busy file system. E.g., 366 * logging exists at the beginning of the read but does not 367 * at the end. 368 * 369 */ 370 if (ulp && (ioflag & FRSYNC) && (ioflag & (FSYNC | FDSYNC)) && 371 TRANS_ISTRANS(ufsvfsp)) { 372 TRANS_BEGIN_SYNC(ufsvfsp, TOP_READ_SYNC, TOP_READ_SIZE, 373 error); 374 ASSERT(!error); 375 intrans = 1; 376 } 377 378 rw_enter(&ip->i_contents, RW_READER); 379 error = rdip(ip, uiop, ioflag, cr); 380 rw_exit(&ip->i_contents); 381 382 if (intrans) { 383 TRANS_END_SYNC(ufsvfsp, error, TOP_READ_SYNC, 384 TOP_READ_SIZE); 385 } 386 } 387 388 if (ulp) { 389 ufs_lockfs_end(ulp); 390 } 391 out: 392 393 return (error); 394 } 395 396 extern int ufs_HW; /* high water mark */ 397 extern int ufs_LW; /* low water mark */ 398 int ufs_WRITES = 1; /* XXX - enable/disable */ 399 int ufs_throttles = 0; /* throttling count */ 400 int ufs_allow_shared_writes = 1; /* directio shared writes */ 401 402 static int 403 ufs_check_rewrite(struct inode *ip, struct uio *uiop, int ioflag) 404 { 405 int shared_write; 406 407 /* 408 * If the FDSYNC flag is set then ignore the global 409 * ufs_allow_shared_writes in this case. 410 */ 411 shared_write = (ioflag & FDSYNC) | ufs_allow_shared_writes; 412 413 /* 414 * Filter to determine if this request is suitable as a 415 * concurrent rewrite. This write must not allocate blocks 416 * by extending the file or filling in holes. No use trying 417 * through FSYNC descriptors as the inode will be synchronously 418 * updated after the write. The uio structure has not yet been 419 * checked for sanity, so assume nothing. 420 */ 421 return (((ip->i_mode & IFMT) == IFREG) && !(ioflag & FAPPEND) && 422 (uiop->uio_loffset >= (offset_t)0) && 423 (uiop->uio_loffset < ip->i_size) && (uiop->uio_resid > 0) && 424 ((ip->i_size - uiop->uio_loffset) >= uiop->uio_resid) && 425 !(ioflag & FSYNC) && !bmap_has_holes(ip) && 426 shared_write); 427 } 428 429 /*ARGSUSED*/ 430 static int 431 ufs_write(struct vnode *vp, struct uio *uiop, int ioflag, cred_t *cr, 432 caller_context_t *ct) 433 { 434 struct inode *ip = VTOI(vp); 435 struct ufsvfs *ufsvfsp; 436 struct ulockfs *ulp; 437 int retry = 1; 438 int error, resv, resid = 0; 439 int directio_status; 440 int exclusive; 441 int rewriteflg; 442 long start_resid = uiop->uio_resid; 443 444 ASSERT(RW_LOCK_HELD(&ip->i_rwlock)); 445 446 retry_mandlock: 447 /* 448 * Mandatory locking needs to be done before ufs_lockfs_begin() 449 * and TRANS_BEGIN_[A]SYNC() calls since mandatory locks can sleep. 450 * Check for forced unmounts normally done in ufs_lockfs_begin(). 451 */ 452 if ((ufsvfsp = ip->i_ufsvfs) == NULL) { 453 error = EIO; 454 goto out; 455 } 456 if (MANDLOCK(vp, ip->i_mode)) { 457 458 ASSERT(RW_WRITE_HELD(&ip->i_rwlock)); 459 460 /* 461 * ufs_getattr ends up being called by chklock 462 */ 463 error = chklock(vp, FWRITE, uiop->uio_loffset, 464 uiop->uio_resid, uiop->uio_fmode, ct); 465 if (error) 466 goto out; 467 } 468 469 /* i_rwlock can change in chklock */ 470 exclusive = rw_write_held(&ip->i_rwlock); 471 rewriteflg = ufs_check_rewrite(ip, uiop, ioflag); 472 473 /* 474 * Check for fast-path special case of directio re-writes. 475 */ 476 if ((ip->i_flag & IDIRECTIO || ufsvfsp->vfs_forcedirectio) && 477 !exclusive && rewriteflg) { 478 479 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_WRITE_MASK); 480 if (error) 481 goto out; 482 483 rw_enter(&ip->i_contents, RW_READER); 484 error = ufs_directio_write(ip, uiop, ioflag, 1, cr, 485 &directio_status); 486 if (directio_status == DIRECTIO_SUCCESS) { 487 uint_t i_flag_save; 488 489 if (start_resid != uiop->uio_resid) 490 error = 0; 491 /* 492 * Special treatment of access times for re-writes. 493 * If IMOD is not already set, then convert it 494 * to IMODACC for this operation. This defers 495 * entering a delta into the log until the inode 496 * is flushed. This mimics what is done for read 497 * operations and inode access time. 498 */ 499 mutex_enter(&ip->i_tlock); 500 i_flag_save = ip->i_flag; 501 ip->i_flag |= IUPD | ICHG; 502 ip->i_seq++; 503 ITIMES_NOLOCK(ip); 504 if ((i_flag_save & IMOD) == 0) { 505 ip->i_flag &= ~IMOD; 506 ip->i_flag |= IMODACC; 507 } 508 mutex_exit(&ip->i_tlock); 509 rw_exit(&ip->i_contents); 510 if (ulp) 511 ufs_lockfs_end(ulp); 512 goto out; 513 } 514 rw_exit(&ip->i_contents); 515 if (ulp) 516 ufs_lockfs_end(ulp); 517 } 518 519 if (!exclusive && !rw_tryupgrade(&ip->i_rwlock)) { 520 rw_exit(&ip->i_rwlock); 521 rw_enter(&ip->i_rwlock, RW_WRITER); 522 /* 523 * Mandatory locking could have been enabled 524 * after dropping the i_rwlock. 525 */ 526 if (MANDLOCK(vp, ip->i_mode)) 527 goto retry_mandlock; 528 } 529 530 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_WRITE_MASK); 531 if (error) 532 goto out; 533 534 /* 535 * Amount of log space needed for this write 536 */ 537 if (!rewriteflg || !(ioflag & FDSYNC)) 538 TRANS_WRITE_RESV(ip, uiop, ulp, &resv, &resid); 539 540 /* 541 * Throttle writes. 542 */ 543 if (ufs_WRITES && (ip->i_writes > ufs_HW)) { 544 mutex_enter(&ip->i_tlock); 545 while (ip->i_writes > ufs_HW) { 546 ufs_throttles++; 547 cv_wait(&ip->i_wrcv, &ip->i_tlock); 548 } 549 mutex_exit(&ip->i_tlock); 550 } 551 552 /* 553 * Enter Transaction 554 * 555 * If the write is a rewrite there is no need to open a transaction 556 * if the FDSYNC flag is set and not the FSYNC. In this case just 557 * set the IMODACC flag to modify do the update at a later time 558 * thus avoiding the overhead of the logging transaction that is 559 * not required. 560 */ 561 if (ioflag & (FSYNC|FDSYNC)) { 562 if (ulp) { 563 if (rewriteflg) { 564 uint_t i_flag_save; 565 566 rw_enter(&ip->i_contents, RW_READER); 567 mutex_enter(&ip->i_tlock); 568 i_flag_save = ip->i_flag; 569 ip->i_flag |= IUPD | ICHG; 570 ip->i_seq++; 571 ITIMES_NOLOCK(ip); 572 if ((i_flag_save & IMOD) == 0) { 573 ip->i_flag &= ~IMOD; 574 ip->i_flag |= IMODACC; 575 } 576 mutex_exit(&ip->i_tlock); 577 rw_exit(&ip->i_contents); 578 } else { 579 int terr = 0; 580 TRANS_BEGIN_SYNC(ufsvfsp, TOP_WRITE_SYNC, resv, 581 terr); 582 ASSERT(!terr); 583 } 584 } 585 } else { 586 if (ulp) 587 TRANS_BEGIN_ASYNC(ufsvfsp, TOP_WRITE, resv); 588 } 589 590 /* 591 * Write the file 592 */ 593 rw_enter(&ufsvfsp->vfs_dqrwlock, RW_READER); 594 rw_enter(&ip->i_contents, RW_WRITER); 595 if ((ioflag & FAPPEND) != 0 && (ip->i_mode & IFMT) == IFREG) { 596 /* 597 * In append mode start at end of file. 598 */ 599 uiop->uio_loffset = ip->i_size; 600 } 601 602 /* 603 * Mild optimisation, don't call ufs_trans_write() unless we have to 604 * Also, suppress file system full messages if we will retry. 605 */ 606 if (retry) 607 ip->i_flag |= IQUIET; 608 if (resid) { 609 TRANS_WRITE(ip, uiop, ioflag, error, ulp, cr, resv, resid); 610 } else { 611 error = wrip(ip, uiop, ioflag, cr); 612 } 613 ip->i_flag &= ~IQUIET; 614 615 rw_exit(&ip->i_contents); 616 rw_exit(&ufsvfsp->vfs_dqrwlock); 617 618 /* 619 * Leave Transaction 620 */ 621 if (ulp) { 622 if (ioflag & (FSYNC|FDSYNC)) { 623 if (!rewriteflg) { 624 int terr = 0; 625 626 TRANS_END_SYNC(ufsvfsp, terr, TOP_WRITE_SYNC, 627 resv); 628 if (error == 0) 629 error = terr; 630 } 631 } else { 632 TRANS_END_ASYNC(ufsvfsp, TOP_WRITE, resv); 633 } 634 ufs_lockfs_end(ulp); 635 } 636 out: 637 if ((error == ENOSPC) && retry && TRANS_ISTRANS(ufsvfsp)) { 638 /* 639 * Any blocks tied up in pending deletes? 640 */ 641 ufs_delete_drain_wait(ufsvfsp, 1); 642 retry = 0; 643 goto retry_mandlock; 644 } 645 646 if (error == ENOSPC && (start_resid != uiop->uio_resid)) 647 error = 0; 648 649 return (error); 650 } 651 652 /* 653 * Don't cache write blocks to files with the sticky bit set. 654 * Used to keep swap files from blowing the page cache on a server. 655 */ 656 int stickyhack = 1; 657 658 /* 659 * Free behind hacks. The pager is busted. 660 * XXX - need to pass the information down to writedone() in a flag like B_SEQ 661 * or B_FREE_IF_TIGHT_ON_MEMORY. 662 */ 663 int freebehind = 1; 664 int smallfile = 0; 665 u_offset_t smallfile64 = 32 * 1024; 666 667 /* 668 * While we should, in most cases, cache the pages for write, we 669 * may also want to cache the pages for read as long as they are 670 * frequently re-usable. 671 * 672 * If cache_read_ahead = 1, the pages for read will go to the tail 673 * of the cache list when they are released, otherwise go to the head. 674 */ 675 int cache_read_ahead = 0; 676 677 /* 678 * Freebehind exists so that as we read large files sequentially we 679 * don't consume most of memory with pages from a few files. It takes 680 * longer to re-read from disk multiple small files as it does reading 681 * one large one sequentially. As system memory grows customers need 682 * to retain bigger chunks of files in memory. The advent of the 683 * cachelist opens up of the possibility freeing pages to the head or 684 * tail of the list. 685 * 686 * Not freeing a page is a bet that the page will be read again before 687 * it's segmap slot is needed for something else. If we loose the bet, 688 * it means some other thread is burdened with the page free we did 689 * not do. If we win we save a free and reclaim. 690 * 691 * Freeing it at the tail vs the head of cachelist is a bet that the 692 * page will survive until the next read. It's also saying that this 693 * page is more likely to be re-used than a page freed some time ago 694 * and never reclaimed. 695 * 696 * Freebehind maintains a range of file offset [smallfile1; smallfile2] 697 * 698 * 0 < offset < smallfile1 : pages are not freed. 699 * smallfile1 < offset < smallfile2 : pages freed to tail of cachelist. 700 * smallfile2 < offset : pages freed to head of cachelist. 701 * 702 * The range is computed at most once per second and depends on 703 * freemem and ncpus_online. Both parameters are bounded to be 704 * >= smallfile && >= smallfile64. 705 * 706 * smallfile1 = (free memory / ncpu) / 1000 707 * smallfile2 = (free memory / ncpu) / 10 708 * 709 * A few examples values: 710 * 711 * Free Mem (in Bytes) [smallfile1; smallfile2] [smallfile1; smallfile2] 712 * ncpus_online = 4 ncpus_online = 64 713 * ------------------ ----------------------- ----------------------- 714 * 1G [256K; 25M] [32K; 1.5M] 715 * 10G [2.5M; 250M] [156K; 15M] 716 * 100G [25M; 2.5G] [1.5M; 150M] 717 * 718 */ 719 720 #define SMALLFILE1_D 1000 721 #define SMALLFILE2_D 10 722 static u_offset_t smallfile1 = 32 * 1024; 723 static u_offset_t smallfile2 = 32 * 1024; 724 static clock_t smallfile_update = 0; /* lbolt value of when to recompute */ 725 uint_t smallfile1_d = SMALLFILE1_D; 726 uint_t smallfile2_d = SMALLFILE2_D; 727 728 /* 729 * wrip does the real work of write requests for ufs. 730 */ 731 int 732 wrip(struct inode *ip, struct uio *uio, int ioflag, struct cred *cr) 733 { 734 rlim64_t limit = uio->uio_llimit; 735 u_offset_t off; 736 u_offset_t old_i_size; 737 struct fs *fs; 738 struct vnode *vp; 739 struct ufsvfs *ufsvfsp; 740 caddr_t base; 741 long start_resid = uio->uio_resid; /* save starting resid */ 742 long premove_resid; /* resid before uiomove() */ 743 uint_t flags; 744 int newpage; 745 int iupdat_flag, directio_status; 746 int n, on, mapon; 747 int error, pagecreate; 748 int do_dqrwlock; /* drop/reacquire vfs_dqrwlock */ 749 int32_t iblocks; 750 int new_iblocks; 751 752 /* 753 * ip->i_size is incremented before the uiomove 754 * is done on a write. If the move fails (bad user 755 * address) reset ip->i_size. 756 * The better way would be to increment ip->i_size 757 * only if the uiomove succeeds. 758 */ 759 int i_size_changed = 0; 760 o_mode_t type; 761 int i_seq_needed = 0; 762 763 vp = ITOV(ip); 764 765 /* 766 * check for forced unmount - should not happen as 767 * the request passed the lockfs checks. 768 */ 769 if ((ufsvfsp = ip->i_ufsvfs) == NULL) 770 return (EIO); 771 772 fs = ip->i_fs; 773 774 ASSERT(RW_WRITE_HELD(&ip->i_contents)); 775 776 /* check for valid filetype */ 777 type = ip->i_mode & IFMT; 778 if ((type != IFREG) && (type != IFDIR) && (type != IFATTRDIR) && 779 (type != IFLNK) && (type != IFSHAD)) { 780 return (EIO); 781 } 782 783 /* 784 * the actual limit of UFS file size 785 * is UFS_MAXOFFSET_T 786 */ 787 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T) 788 limit = MAXOFFSET_T; 789 790 if (uio->uio_loffset >= limit) { 791 proc_t *p = ttoproc(curthread); 792 793 mutex_enter(&p->p_lock); 794 (void) rctl_action(rctlproc_legacy[RLIMIT_FSIZE], p->p_rctls, 795 p, RCA_UNSAFE_SIGINFO); 796 mutex_exit(&p->p_lock); 797 return (EFBIG); 798 } 799 800 /* 801 * if largefiles are disallowed, the limit is 802 * the pre-largefiles value of 2GB 803 */ 804 if (ufsvfsp->vfs_lfflags & UFS_LARGEFILES) 805 limit = MIN(UFS_MAXOFFSET_T, limit); 806 else 807 limit = MIN(MAXOFF32_T, limit); 808 809 if (uio->uio_loffset < (offset_t)0) { 810 return (EINVAL); 811 } 812 if (uio->uio_resid == 0) { 813 return (0); 814 } 815 816 if (uio->uio_loffset >= limit) 817 return (EFBIG); 818 819 ip->i_flag |= INOACC; /* don't update ref time in getpage */ 820 821 if (ioflag & (FSYNC|FDSYNC)) { 822 ip->i_flag |= ISYNC; 823 iupdat_flag = 1; 824 } 825 /* 826 * Try to go direct 827 */ 828 if (ip->i_flag & IDIRECTIO || ufsvfsp->vfs_forcedirectio) { 829 uio->uio_llimit = limit; 830 error = ufs_directio_write(ip, uio, ioflag, 0, cr, 831 &directio_status); 832 /* 833 * If ufs_directio wrote to the file or set the flags, 834 * we need to update i_seq, but it may be deferred. 835 */ 836 if (start_resid != uio->uio_resid || 837 (ip->i_flag & (ICHG|IUPD))) { 838 i_seq_needed = 1; 839 ip->i_flag |= ISEQ; 840 } 841 if (directio_status == DIRECTIO_SUCCESS) 842 goto out; 843 } 844 845 /* 846 * Behavior with respect to dropping/reacquiring vfs_dqrwlock: 847 * 848 * o shadow inodes: vfs_dqrwlock is not held at all 849 * o quota updates: vfs_dqrwlock is read or write held 850 * o other updates: vfs_dqrwlock is read held 851 * 852 * The first case is the only one where we do not hold 853 * vfs_dqrwlock at all while entering wrip(). 854 * We must make sure not to downgrade/drop vfs_dqrwlock if we 855 * have it as writer, i.e. if we are updating the quota inode. 856 * There is no potential deadlock scenario in this case as 857 * ufs_getpage() takes care of this and avoids reacquiring 858 * vfs_dqrwlock in that case. 859 * 860 * This check is done here since the above conditions do not change 861 * and we possibly loop below, so save a few cycles. 862 */ 863 if ((type == IFSHAD) || 864 (rw_owner(&ufsvfsp->vfs_dqrwlock) == curthread)) { 865 do_dqrwlock = 0; 866 } else { 867 do_dqrwlock = 1; 868 } 869 870 /* 871 * Large Files: We cast MAXBMASK to offset_t 872 * inorder to mask out the higher bits. Since offset_t 873 * is a signed value, the high order bit set in MAXBMASK 874 * value makes it do the right thing by having all bits 1 875 * in the higher word. May be removed for _SOLARIS64_. 876 */ 877 878 fs = ip->i_fs; 879 do { 880 u_offset_t uoff = uio->uio_loffset; 881 off = uoff & (offset_t)MAXBMASK; 882 mapon = (int)(uoff & (offset_t)MAXBOFFSET); 883 on = (int)blkoff(fs, uoff); 884 n = (int)MIN(fs->fs_bsize - on, uio->uio_resid); 885 new_iblocks = 1; 886 887 if (type == IFREG && uoff + n >= limit) { 888 if (uoff >= limit) { 889 error = EFBIG; 890 goto out; 891 } 892 /* 893 * since uoff + n >= limit, 894 * therefore n >= limit - uoff, and n is an int 895 * so it is safe to cast it to an int 896 */ 897 n = (int)(limit - (rlim64_t)uoff); 898 } 899 if (uoff + n > ip->i_size) { 900 /* 901 * We are extending the length of the file. 902 * bmap is used so that we are sure that 903 * if we need to allocate new blocks, that it 904 * is done here before we up the file size. 905 */ 906 error = bmap_write(ip, uoff, (int)(on + n), 907 mapon == 0, NULL, cr); 908 /* 909 * bmap_write never drops i_contents so if 910 * the flags are set it changed the file. 911 */ 912 if (ip->i_flag & (ICHG|IUPD)) { 913 i_seq_needed = 1; 914 ip->i_flag |= ISEQ; 915 } 916 if (error) 917 break; 918 /* 919 * There is a window of vulnerability here. 920 * The sequence of operations: allocate file 921 * system blocks, uiomove the data into pages, 922 * and then update the size of the file in the 923 * inode, must happen atomically. However, due 924 * to current locking constraints, this can not 925 * be done. 926 */ 927 ASSERT(ip->i_writer == NULL); 928 ip->i_writer = curthread; 929 i_size_changed = 1; 930 /* 931 * If we are writing from the beginning of 932 * the mapping, we can just create the 933 * pages without having to read them. 934 */ 935 pagecreate = (mapon == 0); 936 } else if (n == MAXBSIZE) { 937 /* 938 * Going to do a whole mappings worth, 939 * so we can just create the pages w/o 940 * having to read them in. But before 941 * we do that, we need to make sure any 942 * needed blocks are allocated first. 943 */ 944 iblocks = ip->i_blocks; 945 error = bmap_write(ip, uoff, (int)(on + n), 946 BI_ALLOC_ONLY, NULL, cr); 947 /* 948 * bmap_write never drops i_contents so if 949 * the flags are set it changed the file. 950 */ 951 if (ip->i_flag & (ICHG|IUPD)) { 952 i_seq_needed = 1; 953 ip->i_flag |= ISEQ; 954 } 955 if (error) 956 break; 957 pagecreate = 1; 958 /* 959 * check if the new created page needed the 960 * allocation of new disk blocks. 961 */ 962 if (iblocks == ip->i_blocks) 963 new_iblocks = 0; /* no new blocks allocated */ 964 } else { 965 pagecreate = 0; 966 /* 967 * In sync mode flush the indirect blocks which 968 * may have been allocated and not written on 969 * disk. In above cases bmap_write will allocate 970 * in sync mode. 971 */ 972 if (ioflag & (FSYNC|FDSYNC)) { 973 error = ufs_indirblk_sync(ip, uoff); 974 if (error) 975 break; 976 } 977 } 978 979 /* 980 * At this point we can enter ufs_getpage() in one 981 * of two ways: 982 * 1) segmap_getmapflt() calls ufs_getpage() when the 983 * forcefault parameter is true (pagecreate == 0) 984 * 2) uiomove() causes a page fault. 985 * 986 * We have to drop the contents lock to prevent the VM 987 * system from trying to reacquire it in ufs_getpage() 988 * should the uiomove cause a pagefault. 989 * 990 * We have to drop the reader vfs_dqrwlock here as well. 991 */ 992 rw_exit(&ip->i_contents); 993 if (do_dqrwlock) { 994 ASSERT(RW_LOCK_HELD(&ufsvfsp->vfs_dqrwlock)); 995 ASSERT(!(RW_WRITE_HELD(&ufsvfsp->vfs_dqrwlock))); 996 rw_exit(&ufsvfsp->vfs_dqrwlock); 997 } 998 999 newpage = 0; 1000 premove_resid = uio->uio_resid; 1001 if (vpm_enable) { 1002 /* 1003 * Copy data. If new pages are created, part of 1004 * the page that is not written will be initizliazed 1005 * with zeros. 1006 */ 1007 error = vpm_data_copy(vp, (off + mapon), (uint_t)n, 1008 uio, !pagecreate, &newpage, 0, S_WRITE); 1009 } else { 1010 1011 base = segmap_getmapflt(segkmap, vp, (off + mapon), 1012 (uint_t)n, !pagecreate, S_WRITE); 1013 1014 /* 1015 * segmap_pagecreate() returns 1 if it calls 1016 * page_create_va() to allocate any pages. 1017 */ 1018 1019 if (pagecreate) 1020 newpage = segmap_pagecreate(segkmap, base, 1021 (size_t)n, 0); 1022 1023 error = uiomove(base + mapon, (long)n, UIO_WRITE, uio); 1024 } 1025 1026 /* 1027 * If "newpage" is set, then a new page was created and it 1028 * does not contain valid data, so it needs to be initialized 1029 * at this point. 1030 * Otherwise the page contains old data, which was overwritten 1031 * partially or as a whole in uiomove. 1032 * If there is only one iovec structure within uio, then 1033 * on error uiomove will not be able to update uio->uio_loffset 1034 * and we would zero the whole page here! 1035 * 1036 * If uiomove fails because of an error, the old valid data 1037 * is kept instead of filling the rest of the page with zero's. 1038 */ 1039 if (!vpm_enable && newpage && 1040 uio->uio_loffset < roundup(off + mapon + n, PAGESIZE)) { 1041 /* 1042 * We created pages w/o initializing them completely, 1043 * thus we need to zero the part that wasn't set up. 1044 * This happens on most EOF write cases and if 1045 * we had some sort of error during the uiomove. 1046 */ 1047 int nzero, nmoved; 1048 1049 nmoved = (int)(uio->uio_loffset - (off + mapon)); 1050 ASSERT(nmoved >= 0 && nmoved <= n); 1051 nzero = roundup(on + n, PAGESIZE) - nmoved; 1052 ASSERT(nzero > 0 && mapon + nmoved + nzero <= MAXBSIZE); 1053 (void) kzero(base + mapon + nmoved, (uint_t)nzero); 1054 } 1055 1056 /* 1057 * Unlock the pages allocated by page_create_va() 1058 * in segmap_pagecreate() 1059 */ 1060 if (!vpm_enable && newpage) 1061 segmap_pageunlock(segkmap, base, (size_t)n, S_WRITE); 1062 1063 /* 1064 * If the size of the file changed, then update the 1065 * size field in the inode now. This can't be done 1066 * before the call to segmap_pageunlock or there is 1067 * a potential deadlock with callers to ufs_putpage(). 1068 * They will be holding i_contents and trying to lock 1069 * a page, while this thread is holding a page locked 1070 * and trying to acquire i_contents. 1071 */ 1072 if (i_size_changed) { 1073 rw_enter(&ip->i_contents, RW_WRITER); 1074 old_i_size = ip->i_size; 1075 UFS_SET_ISIZE(uoff + n, ip); 1076 TRANS_INODE(ufsvfsp, ip); 1077 /* 1078 * file has grown larger than 2GB. Set flag 1079 * in superblock to indicate this, if it 1080 * is not already set. 1081 */ 1082 if ((ip->i_size > MAXOFF32_T) && 1083 !(fs->fs_flags & FSLARGEFILES)) { 1084 ASSERT(ufsvfsp->vfs_lfflags & UFS_LARGEFILES); 1085 mutex_enter(&ufsvfsp->vfs_lock); 1086 fs->fs_flags |= FSLARGEFILES; 1087 ufs_sbwrite(ufsvfsp); 1088 mutex_exit(&ufsvfsp->vfs_lock); 1089 } 1090 mutex_enter(&ip->i_tlock); 1091 ip->i_writer = NULL; 1092 cv_broadcast(&ip->i_wrcv); 1093 mutex_exit(&ip->i_tlock); 1094 rw_exit(&ip->i_contents); 1095 } 1096 1097 if (error) { 1098 /* 1099 * If we failed on a write, we may have already 1100 * allocated file blocks as well as pages. It's 1101 * hard to undo the block allocation, but we must 1102 * be sure to invalidate any pages that may have 1103 * been allocated. 1104 * 1105 * If the page was created without initialization 1106 * then we must check if it should be possible 1107 * to destroy the new page and to keep the old data 1108 * on the disk. 1109 * 1110 * It is possible to destroy the page without 1111 * having to write back its contents only when 1112 * - the size of the file keeps unchanged 1113 * - bmap_write() did not allocate new disk blocks 1114 * it is possible to create big files using "seek" and 1115 * write to the end of the file. A "write" to a 1116 * position before the end of the file would not 1117 * change the size of the file but it would allocate 1118 * new disk blocks. 1119 * - uiomove intended to overwrite the whole page. 1120 * - a new page was created (newpage == 1). 1121 */ 1122 1123 if (i_size_changed == 0 && new_iblocks == 0 && 1124 newpage) { 1125 1126 /* unwind what uiomove eventually last did */ 1127 uio->uio_resid = premove_resid; 1128 1129 /* 1130 * destroy the page, do not write ambiguous 1131 * data to the disk. 1132 */ 1133 flags = SM_DESTROY; 1134 } else { 1135 /* 1136 * write the page back to the disk, if dirty, 1137 * and remove the page from the cache. 1138 */ 1139 flags = SM_INVAL; 1140 } 1141 1142 if (vpm_enable) { 1143 /* 1144 * Flush pages. 1145 */ 1146 (void) vpm_sync_pages(vp, off, n, flags); 1147 } else { 1148 (void) segmap_release(segkmap, base, flags); 1149 } 1150 } else { 1151 flags = 0; 1152 /* 1153 * Force write back for synchronous write cases. 1154 */ 1155 if ((ioflag & (FSYNC|FDSYNC)) || type == IFDIR) { 1156 /* 1157 * If the sticky bit is set but the 1158 * execute bit is not set, we do a 1159 * synchronous write back and free 1160 * the page when done. We set up swap 1161 * files to be handled this way to 1162 * prevent servers from keeping around 1163 * the client's swap pages too long. 1164 * XXX - there ought to be a better way. 1165 */ 1166 if (IS_SWAPVP(vp)) { 1167 flags = SM_WRITE | SM_FREE | 1168 SM_DONTNEED; 1169 iupdat_flag = 0; 1170 } else { 1171 flags = SM_WRITE; 1172 } 1173 } else if (n + on == MAXBSIZE || IS_SWAPVP(vp)) { 1174 /* 1175 * Have written a whole block. 1176 * Start an asynchronous write and 1177 * mark the buffer to indicate that 1178 * it won't be needed again soon. 1179 */ 1180 flags = SM_WRITE | SM_ASYNC | SM_DONTNEED; 1181 } 1182 if (vpm_enable) { 1183 /* 1184 * Flush pages. 1185 */ 1186 error = vpm_sync_pages(vp, off, n, flags); 1187 } else { 1188 error = segmap_release(segkmap, base, flags); 1189 } 1190 /* 1191 * If the operation failed and is synchronous, 1192 * then we need to unwind what uiomove() last 1193 * did so we can potentially return an error to 1194 * the caller. If this write operation was 1195 * done in two pieces and the first succeeded, 1196 * then we won't return an error for the second 1197 * piece that failed. However, we only want to 1198 * return a resid value that reflects what was 1199 * really done. 1200 * 1201 * Failures for non-synchronous operations can 1202 * be ignored since the page subsystem will 1203 * retry the operation until it succeeds or the 1204 * file system is unmounted. 1205 */ 1206 if (error) { 1207 if ((ioflag & (FSYNC | FDSYNC)) || 1208 type == IFDIR) { 1209 uio->uio_resid = premove_resid; 1210 } else { 1211 error = 0; 1212 } 1213 } 1214 } 1215 1216 /* 1217 * Re-acquire contents lock. 1218 * If it was dropped, reacquire reader vfs_dqrwlock as well. 1219 */ 1220 if (do_dqrwlock) 1221 rw_enter(&ufsvfsp->vfs_dqrwlock, RW_READER); 1222 rw_enter(&ip->i_contents, RW_WRITER); 1223 1224 /* 1225 * If the uiomove() failed or if a synchronous 1226 * page push failed, fix up i_size. 1227 */ 1228 if (error) { 1229 if (i_size_changed) { 1230 /* 1231 * The uiomove failed, and we 1232 * allocated blocks,so get rid 1233 * of them. 1234 */ 1235 (void) ufs_itrunc(ip, old_i_size, 0, cr); 1236 } 1237 } else { 1238 /* 1239 * XXX - Can this be out of the loop? 1240 */ 1241 ip->i_flag |= IUPD | ICHG; 1242 /* 1243 * Only do one increase of i_seq for multiple 1244 * pieces. Because we drop locks, record 1245 * the fact that we changed the timestamp and 1246 * are deferring the increase in case another thread 1247 * pushes our timestamp update. 1248 */ 1249 i_seq_needed = 1; 1250 ip->i_flag |= ISEQ; 1251 if (i_size_changed) 1252 ip->i_flag |= IATTCHG; 1253 if ((ip->i_mode & (IEXEC | (IEXEC >> 3) | 1254 (IEXEC >> 6))) != 0 && 1255 (ip->i_mode & (ISUID | ISGID)) != 0 && 1256 secpolicy_vnode_setid_retain(cr, 1257 (ip->i_mode & ISUID) != 0 && ip->i_uid == 0) != 0) { 1258 /* 1259 * Clear Set-UID & Set-GID bits on 1260 * successful write if not privileged 1261 * and at least one of the execute bits 1262 * is set. If we always clear Set-GID, 1263 * mandatory file and record locking is 1264 * unuseable. 1265 */ 1266 ip->i_mode &= ~(ISUID | ISGID); 1267 } 1268 } 1269 /* 1270 * In the case the FDSYNC flag is set and this is a 1271 * "rewrite" we won't log a delta. 1272 * The FSYNC flag overrides all cases. 1273 */ 1274 if (!ufs_check_rewrite(ip, uio, ioflag) || !(ioflag & FDSYNC)) { 1275 TRANS_INODE(ufsvfsp, ip); 1276 } 1277 } while (error == 0 && uio->uio_resid > 0 && n != 0); 1278 1279 out: 1280 /* 1281 * Make sure i_seq is increased at least once per write 1282 */ 1283 if (i_seq_needed) { 1284 ip->i_seq++; 1285 ip->i_flag &= ~ISEQ; /* no longer deferred */ 1286 } 1287 1288 /* 1289 * Inode is updated according to this table - 1290 * 1291 * FSYNC FDSYNC(posix.4) 1292 * -------------------------- 1293 * always@ IATTCHG|IBDWRITE 1294 * 1295 * @ - If we are doing synchronous write the only time we should 1296 * not be sync'ing the ip here is if we have the stickyhack 1297 * activated, the file is marked with the sticky bit and 1298 * no exec bit, the file length has not been changed and 1299 * no new blocks have been allocated during this write. 1300 */ 1301 1302 if ((ip->i_flag & ISYNC) != 0) { 1303 /* 1304 * we have eliminated nosync 1305 */ 1306 if ((ip->i_flag & (IATTCHG|IBDWRITE)) || 1307 ((ioflag & FSYNC) && iupdat_flag)) { 1308 ufs_iupdat(ip, 1); 1309 } 1310 } 1311 1312 /* 1313 * If we've already done a partial-write, terminate 1314 * the write but return no error unless the error is ENOSPC 1315 * because the caller can detect this and free resources and 1316 * try again. 1317 */ 1318 if ((start_resid != uio->uio_resid) && (error != ENOSPC)) 1319 error = 0; 1320 1321 ip->i_flag &= ~(INOACC | ISYNC); 1322 ITIMES_NOLOCK(ip); 1323 return (error); 1324 } 1325 1326 /* 1327 * rdip does the real work of read requests for ufs. 1328 */ 1329 int 1330 rdip(struct inode *ip, struct uio *uio, int ioflag, cred_t *cr) 1331 { 1332 u_offset_t off; 1333 caddr_t base; 1334 struct fs *fs; 1335 struct ufsvfs *ufsvfsp; 1336 struct vnode *vp; 1337 long oresid = uio->uio_resid; 1338 u_offset_t n, on, mapon; 1339 int error = 0; 1340 int doupdate = 1; 1341 uint_t flags; 1342 int dofree, directio_status; 1343 krw_t rwtype; 1344 o_mode_t type; 1345 1346 vp = ITOV(ip); 1347 1348 ASSERT(RW_LOCK_HELD(&ip->i_contents)); 1349 1350 ufsvfsp = ip->i_ufsvfs; 1351 1352 if (ufsvfsp == NULL) 1353 return (EIO); 1354 1355 fs = ufsvfsp->vfs_fs; 1356 1357 /* check for valid filetype */ 1358 type = ip->i_mode & IFMT; 1359 if ((type != IFREG) && (type != IFDIR) && (type != IFATTRDIR) && 1360 (type != IFLNK) && (type != IFSHAD)) { 1361 return (EIO); 1362 } 1363 1364 if (uio->uio_loffset > UFS_MAXOFFSET_T) { 1365 error = 0; 1366 goto out; 1367 } 1368 if (uio->uio_loffset < (offset_t)0) { 1369 return (EINVAL); 1370 } 1371 if (uio->uio_resid == 0) { 1372 return (0); 1373 } 1374 1375 if (!ULOCKFS_IS_NOIACC(ITOUL(ip)) && (fs->fs_ronly == 0) && 1376 (!ufsvfsp->vfs_noatime)) { 1377 mutex_enter(&ip->i_tlock); 1378 ip->i_flag |= IACC; 1379 mutex_exit(&ip->i_tlock); 1380 } 1381 /* 1382 * Try to go direct 1383 */ 1384 if (ip->i_flag & IDIRECTIO || ufsvfsp->vfs_forcedirectio) { 1385 error = ufs_directio_read(ip, uio, cr, &directio_status); 1386 if (directio_status == DIRECTIO_SUCCESS) 1387 goto out; 1388 } 1389 1390 rwtype = (rw_write_held(&ip->i_contents)?RW_WRITER:RW_READER); 1391 1392 do { 1393 offset_t diff; 1394 u_offset_t uoff = uio->uio_loffset; 1395 off = uoff & (offset_t)MAXBMASK; 1396 mapon = (u_offset_t)(uoff & (offset_t)MAXBOFFSET); 1397 on = (u_offset_t)blkoff(fs, uoff); 1398 n = MIN((u_offset_t)fs->fs_bsize - on, 1399 (u_offset_t)uio->uio_resid); 1400 1401 diff = ip->i_size - uoff; 1402 1403 if (diff <= (offset_t)0) { 1404 error = 0; 1405 goto out; 1406 } 1407 if (diff < (offset_t)n) 1408 n = (int)diff; 1409 1410 /* 1411 * We update smallfile2 and smallfile1 at most every second. 1412 */ 1413 if (lbolt >= smallfile_update) { 1414 uint64_t percpufreeb; 1415 if (smallfile1_d == 0) smallfile1_d = SMALLFILE1_D; 1416 if (smallfile2_d == 0) smallfile2_d = SMALLFILE2_D; 1417 percpufreeb = ptob((uint64_t)freemem) / ncpus_online; 1418 smallfile1 = percpufreeb / smallfile1_d; 1419 smallfile2 = percpufreeb / smallfile2_d; 1420 smallfile1 = MAX(smallfile1, smallfile); 1421 smallfile1 = MAX(smallfile1, smallfile64); 1422 smallfile2 = MAX(smallfile1, smallfile2); 1423 smallfile_update = lbolt + hz; 1424 } 1425 1426 dofree = freebehind && 1427 ip->i_nextr == (off & PAGEMASK) && off > smallfile1; 1428 1429 /* 1430 * At this point we can enter ufs_getpage() in one of two 1431 * ways: 1432 * 1) segmap_getmapflt() calls ufs_getpage() when the 1433 * forcefault parameter is true (value of 1 is passed) 1434 * 2) uiomove() causes a page fault. 1435 * 1436 * We cannot hold onto an i_contents reader lock without 1437 * risking deadlock in ufs_getpage() so drop a reader lock. 1438 * The ufs_getpage() dolock logic already allows for a 1439 * thread holding i_contents as writer to work properly 1440 * so we keep a writer lock. 1441 */ 1442 if (rwtype == RW_READER) 1443 rw_exit(&ip->i_contents); 1444 1445 if (vpm_enable) { 1446 /* 1447 * Copy data. 1448 */ 1449 error = vpm_data_copy(vp, (off + mapon), (uint_t)n, 1450 uio, 1, NULL, 0, S_READ); 1451 } else { 1452 base = segmap_getmapflt(segkmap, vp, (off + mapon), 1453 (uint_t)n, 1, S_READ); 1454 error = uiomove(base + mapon, (long)n, UIO_READ, uio); 1455 } 1456 1457 flags = 0; 1458 if (!error) { 1459 /* 1460 * If reading sequential we won't need this 1461 * buffer again soon. For offsets in range 1462 * [smallfile1, smallfile2] release the pages 1463 * at the tail of the cache list, larger 1464 * offsets are released at the head. 1465 */ 1466 if (dofree) { 1467 flags = SM_FREE | SM_ASYNC; 1468 if ((cache_read_ahead == 0) && 1469 (off > smallfile2)) 1470 flags |= SM_DONTNEED; 1471 } 1472 /* 1473 * In POSIX SYNC (FSYNC and FDSYNC) read mode, 1474 * we want to make sure that the page which has 1475 * been read, is written on disk if it is dirty. 1476 * And corresponding indirect blocks should also 1477 * be flushed out. 1478 */ 1479 if ((ioflag & FRSYNC) && (ioflag & (FSYNC|FDSYNC))) { 1480 flags &= ~SM_ASYNC; 1481 flags |= SM_WRITE; 1482 } 1483 if (vpm_enable) { 1484 error = vpm_sync_pages(vp, off, n, flags); 1485 } else { 1486 error = segmap_release(segkmap, base, flags); 1487 } 1488 } else { 1489 if (vpm_enable) { 1490 (void) vpm_sync_pages(vp, off, n, flags); 1491 } else { 1492 (void) segmap_release(segkmap, base, flags); 1493 } 1494 } 1495 1496 if (rwtype == RW_READER) 1497 rw_enter(&ip->i_contents, rwtype); 1498 } while (error == 0 && uio->uio_resid > 0 && n != 0); 1499 out: 1500 /* 1501 * Inode is updated according to this table if FRSYNC is set. 1502 * 1503 * FSYNC FDSYNC(posix.4) 1504 * -------------------------- 1505 * always IATTCHG|IBDWRITE 1506 */ 1507 /* 1508 * The inode is not updated if we're logging and the inode is a 1509 * directory with FRSYNC, FSYNC and FDSYNC flags set. 1510 */ 1511 if (ioflag & FRSYNC) { 1512 if (TRANS_ISTRANS(ufsvfsp) && ((ip->i_mode & IFMT) == IFDIR)) { 1513 doupdate = 0; 1514 } 1515 if (doupdate) { 1516 if ((ioflag & FSYNC) || 1517 ((ioflag & FDSYNC) && 1518 (ip->i_flag & (IATTCHG|IBDWRITE)))) { 1519 ufs_iupdat(ip, 1); 1520 } 1521 } 1522 } 1523 /* 1524 * If we've already done a partial read, terminate 1525 * the read but return no error. 1526 */ 1527 if (oresid != uio->uio_resid) 1528 error = 0; 1529 ITIMES(ip); 1530 1531 return (error); 1532 } 1533 1534 /* ARGSUSED */ 1535 static int 1536 ufs_ioctl( 1537 struct vnode *vp, 1538 int cmd, 1539 intptr_t arg, 1540 int flag, 1541 struct cred *cr, 1542 int *rvalp, 1543 caller_context_t *ct) 1544 { 1545 struct lockfs lockfs, lockfs_out; 1546 struct ufsvfs *ufsvfsp = VTOI(vp)->i_ufsvfs; 1547 char *comment, *original_comment; 1548 struct fs *fs; 1549 struct ulockfs *ulp; 1550 offset_t off; 1551 extern int maxphys; 1552 int error; 1553 int issync; 1554 int trans_size; 1555 1556 1557 /* 1558 * forcibly unmounted 1559 */ 1560 if (ufsvfsp == NULL) { 1561 return (EIO); 1562 } 1563 1564 fs = ufsvfsp->vfs_fs; 1565 1566 if (cmd == Q_QUOTACTL) { 1567 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_QUOTA_MASK); 1568 if (error) 1569 return (error); 1570 1571 if (ulp) { 1572 TRANS_BEGIN_ASYNC(ufsvfsp, TOP_QUOTA, 1573 TOP_SETQUOTA_SIZE(fs)); 1574 } 1575 1576 error = quotactl(vp, arg, flag, cr); 1577 1578 if (ulp) { 1579 TRANS_END_ASYNC(ufsvfsp, TOP_QUOTA, 1580 TOP_SETQUOTA_SIZE(fs)); 1581 ufs_lockfs_end(ulp); 1582 } 1583 return (error); 1584 } 1585 1586 switch (cmd) { 1587 case _FIOLFS: 1588 /* 1589 * file system locking 1590 */ 1591 if (secpolicy_fs_config(cr, ufsvfsp->vfs_vfs) != 0) 1592 return (EPERM); 1593 1594 if ((flag & DATAMODEL_MASK) == DATAMODEL_NATIVE) { 1595 if (copyin((caddr_t)arg, &lockfs, 1596 sizeof (struct lockfs))) 1597 return (EFAULT); 1598 } 1599 #ifdef _SYSCALL32_IMPL 1600 else { 1601 struct lockfs32 lockfs32; 1602 /* Translate ILP32 lockfs to LP64 lockfs */ 1603 if (copyin((caddr_t)arg, &lockfs32, 1604 sizeof (struct lockfs32))) 1605 return (EFAULT); 1606 lockfs.lf_lock = (ulong_t)lockfs32.lf_lock; 1607 lockfs.lf_flags = (ulong_t)lockfs32.lf_flags; 1608 lockfs.lf_key = (ulong_t)lockfs32.lf_key; 1609 lockfs.lf_comlen = (ulong_t)lockfs32.lf_comlen; 1610 lockfs.lf_comment = 1611 (caddr_t)(uintptr_t)lockfs32.lf_comment; 1612 } 1613 #endif /* _SYSCALL32_IMPL */ 1614 1615 if (lockfs.lf_comlen) { 1616 if (lockfs.lf_comlen > LOCKFS_MAXCOMMENTLEN) 1617 return (ENAMETOOLONG); 1618 comment = 1619 kmem_alloc(lockfs.lf_comlen, KM_SLEEP); 1620 if (copyin(lockfs.lf_comment, comment, 1621 lockfs.lf_comlen)) { 1622 kmem_free(comment, lockfs.lf_comlen); 1623 return (EFAULT); 1624 } 1625 original_comment = lockfs.lf_comment; 1626 lockfs.lf_comment = comment; 1627 } 1628 if ((error = ufs_fiolfs(vp, &lockfs, 0)) == 0) { 1629 lockfs.lf_comment = original_comment; 1630 1631 if ((flag & DATAMODEL_MASK) == 1632 DATAMODEL_NATIVE) { 1633 (void) copyout(&lockfs, (caddr_t)arg, 1634 sizeof (struct lockfs)); 1635 } 1636 #ifdef _SYSCALL32_IMPL 1637 else { 1638 struct lockfs32 lockfs32; 1639 /* Translate LP64 to ILP32 lockfs */ 1640 lockfs32.lf_lock = 1641 (uint32_t)lockfs.lf_lock; 1642 lockfs32.lf_flags = 1643 (uint32_t)lockfs.lf_flags; 1644 lockfs32.lf_key = 1645 (uint32_t)lockfs.lf_key; 1646 lockfs32.lf_comlen = 1647 (uint32_t)lockfs.lf_comlen; 1648 lockfs32.lf_comment = 1649 (uint32_t)(uintptr_t) 1650 lockfs.lf_comment; 1651 (void) copyout(&lockfs32, (caddr_t)arg, 1652 sizeof (struct lockfs32)); 1653 } 1654 #endif /* _SYSCALL32_IMPL */ 1655 1656 } else { 1657 if (lockfs.lf_comlen) 1658 kmem_free(comment, lockfs.lf_comlen); 1659 } 1660 return (error); 1661 1662 case _FIOLFSS: 1663 /* 1664 * get file system locking status 1665 */ 1666 1667 if ((flag & DATAMODEL_MASK) == DATAMODEL_NATIVE) { 1668 if (copyin((caddr_t)arg, &lockfs, 1669 sizeof (struct lockfs))) 1670 return (EFAULT); 1671 } 1672 #ifdef _SYSCALL32_IMPL 1673 else { 1674 struct lockfs32 lockfs32; 1675 /* Translate ILP32 lockfs to LP64 lockfs */ 1676 if (copyin((caddr_t)arg, &lockfs32, 1677 sizeof (struct lockfs32))) 1678 return (EFAULT); 1679 lockfs.lf_lock = (ulong_t)lockfs32.lf_lock; 1680 lockfs.lf_flags = (ulong_t)lockfs32.lf_flags; 1681 lockfs.lf_key = (ulong_t)lockfs32.lf_key; 1682 lockfs.lf_comlen = (ulong_t)lockfs32.lf_comlen; 1683 lockfs.lf_comment = 1684 (caddr_t)(uintptr_t)lockfs32.lf_comment; 1685 } 1686 #endif /* _SYSCALL32_IMPL */ 1687 1688 if (error = ufs_fiolfss(vp, &lockfs_out)) 1689 return (error); 1690 lockfs.lf_lock = lockfs_out.lf_lock; 1691 lockfs.lf_key = lockfs_out.lf_key; 1692 lockfs.lf_flags = lockfs_out.lf_flags; 1693 lockfs.lf_comlen = MIN(lockfs.lf_comlen, 1694 lockfs_out.lf_comlen); 1695 1696 if ((flag & DATAMODEL_MASK) == DATAMODEL_NATIVE) { 1697 if (copyout(&lockfs, (caddr_t)arg, 1698 sizeof (struct lockfs))) 1699 return (EFAULT); 1700 } 1701 #ifdef _SYSCALL32_IMPL 1702 else { 1703 /* Translate LP64 to ILP32 lockfs */ 1704 struct lockfs32 lockfs32; 1705 lockfs32.lf_lock = (uint32_t)lockfs.lf_lock; 1706 lockfs32.lf_flags = (uint32_t)lockfs.lf_flags; 1707 lockfs32.lf_key = (uint32_t)lockfs.lf_key; 1708 lockfs32.lf_comlen = (uint32_t)lockfs.lf_comlen; 1709 lockfs32.lf_comment = 1710 (uint32_t)(uintptr_t)lockfs.lf_comment; 1711 if (copyout(&lockfs32, (caddr_t)arg, 1712 sizeof (struct lockfs32))) 1713 return (EFAULT); 1714 } 1715 #endif /* _SYSCALL32_IMPL */ 1716 1717 if (lockfs.lf_comlen && 1718 lockfs.lf_comment && lockfs_out.lf_comment) 1719 if (copyout(lockfs_out.lf_comment, 1720 lockfs.lf_comment, lockfs.lf_comlen)) 1721 return (EFAULT); 1722 return (0); 1723 1724 case _FIOSATIME: 1725 /* 1726 * set access time 1727 */ 1728 1729 /* 1730 * if mounted w/o atime, return quietly. 1731 * I briefly thought about returning ENOSYS, but 1732 * figured that most apps would consider this fatal 1733 * but the idea is to make this as seamless as poss. 1734 */ 1735 if (ufsvfsp->vfs_noatime) 1736 return (0); 1737 1738 error = ufs_lockfs_begin(ufsvfsp, &ulp, 1739 ULOCKFS_SETATTR_MASK); 1740 if (error) 1741 return (error); 1742 1743 if (ulp) { 1744 trans_size = (int)TOP_SETATTR_SIZE(VTOI(vp)); 1745 TRANS_BEGIN_CSYNC(ufsvfsp, issync, 1746 TOP_SETATTR, trans_size); 1747 } 1748 1749 error = ufs_fiosatime(vp, (struct timeval *)arg, 1750 flag, cr); 1751 1752 if (ulp) { 1753 TRANS_END_CSYNC(ufsvfsp, error, issync, 1754 TOP_SETATTR, trans_size); 1755 ufs_lockfs_end(ulp); 1756 } 1757 return (error); 1758 1759 case _FIOSDIO: 1760 /* 1761 * set delayed-io 1762 */ 1763 return (ufs_fiosdio(vp, (uint_t *)arg, flag, cr)); 1764 1765 case _FIOGDIO: 1766 /* 1767 * get delayed-io 1768 */ 1769 return (ufs_fiogdio(vp, (uint_t *)arg, flag, cr)); 1770 1771 case _FIOIO: 1772 /* 1773 * inode open 1774 */ 1775 error = ufs_lockfs_begin(ufsvfsp, &ulp, 1776 ULOCKFS_VGET_MASK); 1777 if (error) 1778 return (error); 1779 1780 error = ufs_fioio(vp, (struct fioio *)arg, flag, cr); 1781 1782 if (ulp) { 1783 ufs_lockfs_end(ulp); 1784 } 1785 return (error); 1786 1787 case _FIOFFS: 1788 /* 1789 * file system flush (push w/invalidate) 1790 */ 1791 if ((caddr_t)arg != NULL) 1792 return (EINVAL); 1793 return (ufs_fioffs(vp, NULL, cr)); 1794 1795 case _FIOISBUSY: 1796 /* 1797 * Contract-private interface for Legato 1798 * Purge this vnode from the DNLC and decide 1799 * if this vnode is busy (*arg == 1) or not 1800 * (*arg == 0) 1801 */ 1802 if (secpolicy_fs_config(cr, ufsvfsp->vfs_vfs) != 0) 1803 return (EPERM); 1804 error = ufs_fioisbusy(vp, (int *)arg, cr); 1805 return (error); 1806 1807 case _FIODIRECTIO: 1808 return (ufs_fiodirectio(vp, (int)arg, cr)); 1809 1810 case _FIOTUNE: 1811 /* 1812 * Tune the file system (aka setting fs attributes) 1813 */ 1814 error = ufs_lockfs_begin(ufsvfsp, &ulp, 1815 ULOCKFS_SETATTR_MASK); 1816 if (error) 1817 return (error); 1818 1819 error = ufs_fiotune(vp, (struct fiotune *)arg, cr); 1820 1821 if (ulp) 1822 ufs_lockfs_end(ulp); 1823 return (error); 1824 1825 case _FIOLOGENABLE: 1826 if (secpolicy_fs_config(cr, ufsvfsp->vfs_vfs) != 0) 1827 return (EPERM); 1828 return (ufs_fiologenable(vp, (void *)arg, cr, flag)); 1829 1830 case _FIOLOGDISABLE: 1831 if (secpolicy_fs_config(cr, ufsvfsp->vfs_vfs) != 0) 1832 return (EPERM); 1833 return (ufs_fiologdisable(vp, (void *)arg, cr, flag)); 1834 1835 case _FIOISLOG: 1836 return (ufs_fioislog(vp, (void *)arg, cr, flag)); 1837 1838 case _FIOSNAPSHOTCREATE_MULTI: 1839 { 1840 struct fiosnapcreate_multi fc, *fcp; 1841 size_t fcm_size; 1842 1843 if (copyin((void *)arg, &fc, sizeof (fc))) 1844 return (EFAULT); 1845 if (fc.backfilecount > MAX_BACKFILE_COUNT) 1846 return (EINVAL); 1847 fcm_size = sizeof (struct fiosnapcreate_multi) + 1848 (fc.backfilecount - 1) * sizeof (int); 1849 fcp = (struct fiosnapcreate_multi *) 1850 kmem_alloc(fcm_size, KM_SLEEP); 1851 if (copyin((void *)arg, fcp, fcm_size)) { 1852 kmem_free(fcp, fcm_size); 1853 return (EFAULT); 1854 } 1855 error = ufs_snap_create(vp, fcp, cr); 1856 /* 1857 * Do copyout even if there is an error because 1858 * the details of error is stored in fcp. 1859 */ 1860 if (copyout(fcp, (void *)arg, fcm_size)) 1861 error = EFAULT; 1862 kmem_free(fcp, fcm_size); 1863 return (error); 1864 } 1865 1866 case _FIOSNAPSHOTDELETE: 1867 { 1868 struct fiosnapdelete fc; 1869 1870 if (copyin((void *)arg, &fc, sizeof (fc))) 1871 return (EFAULT); 1872 error = ufs_snap_delete(vp, &fc, cr); 1873 if (!error && copyout(&fc, (void *)arg, sizeof (fc))) 1874 error = EFAULT; 1875 return (error); 1876 } 1877 1878 case _FIOGETSUPERBLOCK: 1879 if (copyout(fs, (void *)arg, SBSIZE)) 1880 return (EFAULT); 1881 return (0); 1882 1883 case _FIOGETMAXPHYS: 1884 if (copyout(&maxphys, (void *)arg, sizeof (maxphys))) 1885 return (EFAULT); 1886 return (0); 1887 1888 /* 1889 * The following 3 ioctls are for TSufs support 1890 * although could potentially be used elsewhere 1891 */ 1892 case _FIO_SET_LUFS_DEBUG: 1893 if (secpolicy_fs_config(cr, ufsvfsp->vfs_vfs) != 0) 1894 return (EPERM); 1895 lufs_debug = (uint32_t)arg; 1896 return (0); 1897 1898 case _FIO_SET_LUFS_ERROR: 1899 if (secpolicy_fs_config(cr, ufsvfsp->vfs_vfs) != 0) 1900 return (EPERM); 1901 TRANS_SETERROR(ufsvfsp); 1902 return (0); 1903 1904 case _FIO_GET_TOP_STATS: 1905 { 1906 fio_lufs_stats_t *ls; 1907 ml_unit_t *ul = ufsvfsp->vfs_log; 1908 1909 ls = kmem_zalloc(sizeof (*ls), KM_SLEEP); 1910 ls->ls_debug = ul->un_debug; /* return debug value */ 1911 /* Copy stucture if statistics are being kept */ 1912 if (ul->un_logmap->mtm_tops) { 1913 ls->ls_topstats = *(ul->un_logmap->mtm_tops); 1914 } 1915 error = 0; 1916 if (copyout(ls, (void *)arg, sizeof (*ls))) 1917 error = EFAULT; 1918 kmem_free(ls, sizeof (*ls)); 1919 return (error); 1920 } 1921 1922 case _FIO_SEEK_DATA: 1923 case _FIO_SEEK_HOLE: 1924 if (ddi_copyin((void *)arg, &off, sizeof (off), flag)) 1925 return (EFAULT); 1926 /* offset paramater is in/out */ 1927 error = ufs_fio_holey(vp, cmd, &off); 1928 if (error) 1929 return (error); 1930 if (ddi_copyout(&off, (void *)arg, sizeof (off), flag)) 1931 return (EFAULT); 1932 return (0); 1933 1934 case _FIO_COMPRESSED: 1935 { 1936 /* 1937 * This is a project private ufs ioctl() to mark 1938 * the inode as that belonging to a compressed 1939 * file. This is used to mark individual 1940 * files in a miniroot archive for SPARC boot. 1941 * The files compressed in this manner are 1942 * automatically decompressed by the dcfs filesystem 1943 * (via an interception in ufs_lookup - see decompvp()) 1944 * which is layered on top of ufs on a system running 1945 * the new archive booted SPARC system. See 1946 * uts/common/fs/dcfs for details. 1947 * This ioctl only marks the file as compressed - the 1948 * actual compression is done by fiocompress (a 1949 * userland utility) which invokes this ioctl(). 1950 */ 1951 struct inode *ip = VTOI(vp); 1952 1953 error = ufs_lockfs_begin(ufsvfsp, &ulp, 1954 ULOCKFS_SETATTR_MASK); 1955 if (error) 1956 return (error); 1957 1958 if (ulp) { 1959 TRANS_BEGIN_ASYNC(ufsvfsp, TOP_IUPDAT, 1960 TOP_IUPDAT_SIZE(ip)); 1961 } 1962 1963 error = ufs_mark_compressed(vp); 1964 1965 if (ulp) { 1966 TRANS_END_ASYNC(ufsvfsp, TOP_IUPDAT, 1967 TOP_IUPDAT_SIZE(ip)); 1968 ufs_lockfs_end(ulp); 1969 } 1970 1971 return (error); 1972 1973 } 1974 1975 default: 1976 return (ENOTTY); 1977 } 1978 } 1979 1980 1981 /* ARGSUSED */ 1982 static int 1983 ufs_getattr(struct vnode *vp, struct vattr *vap, int flags, 1984 struct cred *cr, caller_context_t *ct) 1985 { 1986 struct inode *ip = VTOI(vp); 1987 struct ufsvfs *ufsvfsp; 1988 int err; 1989 1990 if (vap->va_mask == AT_SIZE) { 1991 /* 1992 * for performance, if only the size is requested don't bother 1993 * with anything else. 1994 */ 1995 UFS_GET_ISIZE(&vap->va_size, ip); 1996 return (0); 1997 } 1998 1999 /* 2000 * inlined lockfs checks 2001 */ 2002 ufsvfsp = ip->i_ufsvfs; 2003 if ((ufsvfsp == NULL) || ULOCKFS_IS_HLOCK(&ufsvfsp->vfs_ulockfs)) { 2004 err = EIO; 2005 goto out; 2006 } 2007 2008 rw_enter(&ip->i_contents, RW_READER); 2009 /* 2010 * Return all the attributes. This should be refined so 2011 * that it only returns what's asked for. 2012 */ 2013 2014 /* 2015 * Copy from inode table. 2016 */ 2017 vap->va_type = vp->v_type; 2018 vap->va_mode = ip->i_mode & MODEMASK; 2019 /* 2020 * If there is an ACL and there is a mask entry, then do the 2021 * extra work that completes the equivalent of an acltomode(3) 2022 * call. According to POSIX P1003.1e, the acl mask should be 2023 * returned in the group permissions field. 2024 * 2025 * - start with the original permission and mode bits (from above) 2026 * - clear the group owner bits 2027 * - add in the mask bits. 2028 */ 2029 if (ip->i_ufs_acl && ip->i_ufs_acl->aclass.acl_ismask) { 2030 vap->va_mode &= ~((VREAD | VWRITE | VEXEC) >> 3); 2031 vap->va_mode |= 2032 (ip->i_ufs_acl->aclass.acl_maskbits & PERMMASK) << 3; 2033 } 2034 vap->va_uid = ip->i_uid; 2035 vap->va_gid = ip->i_gid; 2036 vap->va_fsid = ip->i_dev; 2037 vap->va_nodeid = (ino64_t)ip->i_number; 2038 vap->va_nlink = ip->i_nlink; 2039 vap->va_size = ip->i_size; 2040 if (vp->v_type == VCHR || vp->v_type == VBLK) 2041 vap->va_rdev = ip->i_rdev; 2042 else 2043 vap->va_rdev = 0; /* not a b/c spec. */ 2044 mutex_enter(&ip->i_tlock); 2045 ITIMES_NOLOCK(ip); /* mark correct time in inode */ 2046 vap->va_seq = ip->i_seq; 2047 vap->va_atime.tv_sec = (time_t)ip->i_atime.tv_sec; 2048 vap->va_atime.tv_nsec = ip->i_atime.tv_usec*1000; 2049 vap->va_mtime.tv_sec = (time_t)ip->i_mtime.tv_sec; 2050 vap->va_mtime.tv_nsec = ip->i_mtime.tv_usec*1000; 2051 vap->va_ctime.tv_sec = (time_t)ip->i_ctime.tv_sec; 2052 vap->va_ctime.tv_nsec = ip->i_ctime.tv_usec*1000; 2053 mutex_exit(&ip->i_tlock); 2054 2055 switch (ip->i_mode & IFMT) { 2056 2057 case IFBLK: 2058 vap->va_blksize = MAXBSIZE; /* was BLKDEV_IOSIZE */ 2059 break; 2060 2061 case IFCHR: 2062 vap->va_blksize = MAXBSIZE; 2063 break; 2064 2065 default: 2066 vap->va_blksize = ip->i_fs->fs_bsize; 2067 break; 2068 } 2069 vap->va_nblocks = (fsblkcnt64_t)ip->i_blocks; 2070 rw_exit(&ip->i_contents); 2071 err = 0; 2072 2073 out: 2074 return (err); 2075 } 2076 2077 /*ARGSUSED4*/ 2078 static int 2079 ufs_setattr( 2080 struct vnode *vp, 2081 struct vattr *vap, 2082 int flags, 2083 struct cred *cr, 2084 caller_context_t *ct) 2085 { 2086 struct inode *ip = VTOI(vp); 2087 struct ufsvfs *ufsvfsp = ip->i_ufsvfs; 2088 struct fs *fs; 2089 struct ulockfs *ulp; 2090 char *errmsg1; 2091 char *errmsg2; 2092 long blocks; 2093 long int mask = vap->va_mask; 2094 size_t len1, len2; 2095 int issync; 2096 int trans_size; 2097 int dotrans; 2098 int dorwlock; 2099 int error; 2100 int owner_change; 2101 int dodqlock; 2102 timestruc_t now; 2103 vattr_t oldva; 2104 int retry = 1; 2105 int indeadlock; 2106 2107 /* 2108 * Cannot set these attributes. 2109 */ 2110 if ((mask & AT_NOSET) || (mask & AT_XVATTR)) 2111 return (EINVAL); 2112 2113 /* 2114 * check for forced unmount 2115 */ 2116 if (ufsvfsp == NULL) 2117 return (EIO); 2118 2119 fs = ufsvfsp->vfs_fs; 2120 if (fs->fs_ronly != 0) 2121 return (EROFS); 2122 2123 again: 2124 errmsg1 = NULL; 2125 errmsg2 = NULL; 2126 dotrans = 0; 2127 dorwlock = 0; 2128 dodqlock = 0; 2129 2130 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_SETATTR_MASK); 2131 if (error) 2132 goto out; 2133 2134 /* 2135 * Acquire i_rwlock before TRANS_BEGIN_CSYNC() if this is a file. 2136 * This follows the protocol for read()/write(). 2137 */ 2138 if (vp->v_type != VDIR) { 2139 /* 2140 * ufs_tryirwlock uses rw_tryenter and checks for SLOCK to 2141 * avoid i_rwlock, ufs_lockfs_begin deadlock. If deadlock 2142 * possible, retries the operation. 2143 */ 2144 ufs_tryirwlock(&ip->i_rwlock, RW_WRITER, retry_file); 2145 if (indeadlock) { 2146 if (ulp) 2147 ufs_lockfs_end(ulp); 2148 goto again; 2149 } 2150 dorwlock = 1; 2151 } 2152 2153 /* 2154 * Truncate file. Must have write permission and not be a directory. 2155 */ 2156 if (mask & AT_SIZE) { 2157 rw_enter(&ip->i_contents, RW_WRITER); 2158 if (vp->v_type == VDIR) { 2159 error = EISDIR; 2160 goto update_inode; 2161 } 2162 if (error = ufs_iaccess(ip, IWRITE, cr)) 2163 goto update_inode; 2164 2165 rw_exit(&ip->i_contents); 2166 error = TRANS_ITRUNC(ip, vap->va_size, 0, cr); 2167 if (error) { 2168 rw_enter(&ip->i_contents, RW_WRITER); 2169 goto update_inode; 2170 } 2171 } 2172 2173 if (ulp) { 2174 trans_size = (int)TOP_SETATTR_SIZE(ip); 2175 TRANS_BEGIN_CSYNC(ufsvfsp, issync, TOP_SETATTR, trans_size); 2176 ++dotrans; 2177 } 2178 2179 /* 2180 * Acquire i_rwlock after TRANS_BEGIN_CSYNC() if this is a directory. 2181 * This follows the protocol established by 2182 * ufs_link/create/remove/rename/mkdir/rmdir/symlink. 2183 */ 2184 if (vp->v_type == VDIR) { 2185 ufs_tryirwlock_trans(&ip->i_rwlock, RW_WRITER, TOP_SETATTR, 2186 retry_dir); 2187 if (indeadlock) 2188 goto again; 2189 dorwlock = 1; 2190 } 2191 2192 /* 2193 * Grab quota lock if we are changing the file's owner. 2194 */ 2195 if (mask & AT_UID) { 2196 rw_enter(&ufsvfsp->vfs_dqrwlock, RW_READER); 2197 dodqlock = 1; 2198 } 2199 rw_enter(&ip->i_contents, RW_WRITER); 2200 2201 oldva.va_mode = ip->i_mode; 2202 oldva.va_uid = ip->i_uid; 2203 oldva.va_gid = ip->i_gid; 2204 2205 vap->va_mask &= ~AT_SIZE; 2206 /* 2207 * ufs_iaccess is "close enough"; that's because it doesn't 2208 * map the defines. 2209 */ 2210 error = secpolicy_vnode_setattr(cr, vp, vap, &oldva, flags, 2211 ufs_iaccess, ip); 2212 if (error) 2213 goto update_inode; 2214 2215 mask = vap->va_mask; 2216 2217 /* 2218 * Change file access modes. 2219 */ 2220 if (mask & AT_MODE) { 2221 ip->i_mode = (ip->i_mode & IFMT) | (vap->va_mode & ~IFMT); 2222 TRANS_INODE(ufsvfsp, ip); 2223 ip->i_flag |= ICHG; 2224 if (stickyhack) { 2225 mutex_enter(&vp->v_lock); 2226 if ((ip->i_mode & (ISVTX | IEXEC | IFDIR)) == ISVTX) 2227 vp->v_flag |= VSWAPLIKE; 2228 else 2229 vp->v_flag &= ~VSWAPLIKE; 2230 mutex_exit(&vp->v_lock); 2231 } 2232 } 2233 if (mask & (AT_UID|AT_GID)) { 2234 if (mask & AT_UID) { 2235 /* 2236 * Don't change ownership of the quota inode. 2237 */ 2238 if (ufsvfsp->vfs_qinod == ip) { 2239 ASSERT(ufsvfsp->vfs_qflags & MQ_ENABLED); 2240 error = EINVAL; 2241 goto update_inode; 2242 } 2243 2244 /* 2245 * No real ownership change. 2246 */ 2247 if (ip->i_uid == vap->va_uid) { 2248 blocks = 0; 2249 owner_change = 0; 2250 } 2251 /* 2252 * Remove the blocks and the file, from the old user's 2253 * quota. 2254 */ 2255 else { 2256 blocks = ip->i_blocks; 2257 owner_change = 1; 2258 2259 (void) chkdq(ip, -blocks, /* force */ 1, cr, 2260 (char **)NULL, (size_t *)NULL); 2261 (void) chkiq(ufsvfsp, /* change */ -1, ip, 2262 (uid_t)ip->i_uid, /* force */ 1, cr, 2263 (char **)NULL, (size_t *)NULL); 2264 dqrele(ip->i_dquot); 2265 } 2266 2267 ip->i_uid = vap->va_uid; 2268 2269 /* 2270 * There is a real ownership change. 2271 */ 2272 if (owner_change) { 2273 /* 2274 * Add the blocks and the file to the new 2275 * user's quota. 2276 */ 2277 ip->i_dquot = getinoquota(ip); 2278 (void) chkdq(ip, blocks, /* force */ 1, cr, 2279 &errmsg1, &len1); 2280 (void) chkiq(ufsvfsp, /* change */ 1, 2281 (struct inode *)NULL, (uid_t)ip->i_uid, 2282 /* force */ 1, cr, &errmsg2, &len2); 2283 } 2284 } 2285 if (mask & AT_GID) { 2286 ip->i_gid = vap->va_gid; 2287 } 2288 TRANS_INODE(ufsvfsp, ip); 2289 ip->i_flag |= ICHG; 2290 } 2291 /* 2292 * Change file access or modified times. 2293 */ 2294 if (mask & (AT_ATIME|AT_MTIME)) { 2295 /* Check that the time value is within ufs range */ 2296 if (((mask & AT_ATIME) && TIMESPEC_OVERFLOW(&vap->va_atime)) || 2297 ((mask & AT_MTIME) && TIMESPEC_OVERFLOW(&vap->va_mtime))) { 2298 error = EOVERFLOW; 2299 goto update_inode; 2300 } 2301 2302 /* 2303 * if the "noaccess" mount option is set and only atime 2304 * update is requested, do nothing. No error is returned. 2305 */ 2306 if ((ufsvfsp->vfs_noatime) && 2307 ((mask & (AT_ATIME|AT_MTIME)) == AT_ATIME)) 2308 goto skip_atime; 2309 2310 if (mask & AT_ATIME) { 2311 ip->i_atime.tv_sec = vap->va_atime.tv_sec; 2312 ip->i_atime.tv_usec = vap->va_atime.tv_nsec / 1000; 2313 ip->i_flag &= ~IACC; 2314 } 2315 if (mask & AT_MTIME) { 2316 ip->i_mtime.tv_sec = vap->va_mtime.tv_sec; 2317 ip->i_mtime.tv_usec = vap->va_mtime.tv_nsec / 1000; 2318 gethrestime(&now); 2319 if (now.tv_sec > TIME32_MAX) { 2320 /* 2321 * In 2038, ctime sticks forever.. 2322 */ 2323 ip->i_ctime.tv_sec = TIME32_MAX; 2324 ip->i_ctime.tv_usec = 0; 2325 } else { 2326 ip->i_ctime.tv_sec = now.tv_sec; 2327 ip->i_ctime.tv_usec = now.tv_nsec / 1000; 2328 } 2329 ip->i_flag &= ~(IUPD|ICHG); 2330 ip->i_flag |= IMODTIME; 2331 } 2332 TRANS_INODE(ufsvfsp, ip); 2333 ip->i_flag |= IMOD; 2334 } 2335 2336 skip_atime: 2337 /* 2338 * The presence of a shadow inode may indicate an ACL, but does 2339 * not imply an ACL. Future FSD types should be handled here too 2340 * and check for the presence of the attribute-specific data 2341 * before referencing it. 2342 */ 2343 if (ip->i_shadow) { 2344 /* 2345 * XXX if ufs_iupdat is changed to sandbagged write fix 2346 * ufs_acl_setattr to push ip to keep acls consistent 2347 * 2348 * Suppress out of inodes messages if we will retry. 2349 */ 2350 if (retry) 2351 ip->i_flag |= IQUIET; 2352 error = ufs_acl_setattr(ip, vap, cr); 2353 ip->i_flag &= ~IQUIET; 2354 } 2355 2356 update_inode: 2357 /* 2358 * Setattr always increases the sequence number 2359 */ 2360 ip->i_seq++; 2361 2362 /* 2363 * if nfsd and not logging; push synchronously 2364 */ 2365 if ((curthread->t_flag & T_DONTPEND) && !TRANS_ISTRANS(ufsvfsp)) { 2366 ufs_iupdat(ip, 1); 2367 } else { 2368 ITIMES_NOLOCK(ip); 2369 } 2370 2371 rw_exit(&ip->i_contents); 2372 if (dodqlock) { 2373 rw_exit(&ufsvfsp->vfs_dqrwlock); 2374 } 2375 if (dorwlock) 2376 rw_exit(&ip->i_rwlock); 2377 2378 if (ulp) { 2379 if (dotrans) { 2380 int terr = 0; 2381 TRANS_END_CSYNC(ufsvfsp, terr, issync, TOP_SETATTR, 2382 trans_size); 2383 if (error == 0) 2384 error = terr; 2385 } 2386 ufs_lockfs_end(ulp); 2387 } 2388 out: 2389 /* 2390 * If out of inodes or blocks, see if we can free something 2391 * up from the delete queue. 2392 */ 2393 if ((error == ENOSPC) && retry && TRANS_ISTRANS(ufsvfsp)) { 2394 ufs_delete_drain_wait(ufsvfsp, 1); 2395 retry = 0; 2396 if (errmsg1 != NULL) 2397 kmem_free(errmsg1, len1); 2398 if (errmsg2 != NULL) 2399 kmem_free(errmsg2, len2); 2400 goto again; 2401 } 2402 if (errmsg1 != NULL) { 2403 uprintf(errmsg1); 2404 kmem_free(errmsg1, len1); 2405 } 2406 if (errmsg2 != NULL) { 2407 uprintf(errmsg2); 2408 kmem_free(errmsg2, len2); 2409 } 2410 return (error); 2411 } 2412 2413 /*ARGSUSED*/ 2414 static int 2415 ufs_access(struct vnode *vp, int mode, int flags, struct cred *cr, 2416 caller_context_t *ct) 2417 { 2418 struct inode *ip = VTOI(vp); 2419 int error; 2420 2421 if (ip->i_ufsvfs == NULL) 2422 return (EIO); 2423 2424 rw_enter(&ip->i_contents, RW_READER); 2425 2426 /* 2427 * The ufs_iaccess function wants to be called with 2428 * mode bits expressed as "ufs specific" bits. 2429 * I.e., VWRITE|VREAD|VEXEC do not make sense to 2430 * ufs_iaccess() but IWRITE|IREAD|IEXEC do. 2431 * But since they're the same we just pass the vnode mode 2432 * bit but just verify that assumption at compile time. 2433 */ 2434 #if IWRITE != VWRITE || IREAD != VREAD || IEXEC != VEXEC 2435 #error "ufs_access needs to map Vmodes to Imodes" 2436 #endif 2437 error = ufs_iaccess(ip, mode, cr); 2438 2439 rw_exit(&ip->i_contents); 2440 2441 return (error); 2442 } 2443 2444 /* ARGSUSED */ 2445 static int 2446 ufs_readlink(struct vnode *vp, struct uio *uiop, struct cred *cr, 2447 caller_context_t *ct) 2448 { 2449 struct inode *ip = VTOI(vp); 2450 struct ufsvfs *ufsvfsp; 2451 struct ulockfs *ulp; 2452 int error; 2453 int fastsymlink; 2454 2455 if (vp->v_type != VLNK) { 2456 error = EINVAL; 2457 goto nolockout; 2458 } 2459 2460 /* 2461 * If the symbolic link is empty there is nothing to read. 2462 * Fast-track these empty symbolic links 2463 */ 2464 if (ip->i_size == 0) { 2465 error = 0; 2466 goto nolockout; 2467 } 2468 2469 ufsvfsp = ip->i_ufsvfs; 2470 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_READLINK_MASK); 2471 if (error) 2472 goto nolockout; 2473 /* 2474 * The ip->i_rwlock protects the data blocks used for FASTSYMLINK 2475 */ 2476 again: 2477 fastsymlink = 0; 2478 if (ip->i_flag & IFASTSYMLNK) { 2479 rw_enter(&ip->i_rwlock, RW_READER); 2480 rw_enter(&ip->i_contents, RW_READER); 2481 if (ip->i_flag & IFASTSYMLNK) { 2482 if (!ULOCKFS_IS_NOIACC(ITOUL(ip)) && 2483 (ip->i_fs->fs_ronly == 0) && 2484 (!ufsvfsp->vfs_noatime)) { 2485 mutex_enter(&ip->i_tlock); 2486 ip->i_flag |= IACC; 2487 mutex_exit(&ip->i_tlock); 2488 } 2489 error = uiomove((caddr_t)&ip->i_db[1], 2490 MIN(ip->i_size, uiop->uio_resid), 2491 UIO_READ, uiop); 2492 ITIMES(ip); 2493 ++fastsymlink; 2494 } 2495 rw_exit(&ip->i_contents); 2496 rw_exit(&ip->i_rwlock); 2497 } 2498 if (!fastsymlink) { 2499 ssize_t size; /* number of bytes read */ 2500 caddr_t basep; /* pointer to input data */ 2501 ino_t ino; 2502 long igen; 2503 struct uio tuio; /* temp uio struct */ 2504 struct uio *tuiop; 2505 iovec_t tiov; /* temp iovec struct */ 2506 char kbuf[FSL_SIZE]; /* buffer to hold fast symlink */ 2507 int tflag = 0; /* flag to indicate temp vars used */ 2508 2509 ino = ip->i_number; 2510 igen = ip->i_gen; 2511 size = uiop->uio_resid; 2512 basep = uiop->uio_iov->iov_base; 2513 tuiop = uiop; 2514 2515 rw_enter(&ip->i_rwlock, RW_WRITER); 2516 rw_enter(&ip->i_contents, RW_WRITER); 2517 if (ip->i_flag & IFASTSYMLNK) { 2518 rw_exit(&ip->i_contents); 2519 rw_exit(&ip->i_rwlock); 2520 goto again; 2521 } 2522 2523 /* can this be a fast symlink and is it a user buffer? */ 2524 if (ip->i_size <= FSL_SIZE && 2525 (uiop->uio_segflg == UIO_USERSPACE || 2526 uiop->uio_segflg == UIO_USERISPACE)) { 2527 2528 bzero(&tuio, sizeof (struct uio)); 2529 /* 2530 * setup a kernel buffer to read link into. this 2531 * is to fix a race condition where the user buffer 2532 * got corrupted before copying it into the inode. 2533 */ 2534 size = ip->i_size; 2535 tiov.iov_len = size; 2536 tiov.iov_base = kbuf; 2537 tuio.uio_iov = &tiov; 2538 tuio.uio_iovcnt = 1; 2539 tuio.uio_offset = uiop->uio_offset; 2540 tuio.uio_segflg = UIO_SYSSPACE; 2541 tuio.uio_fmode = uiop->uio_fmode; 2542 tuio.uio_extflg = uiop->uio_extflg; 2543 tuio.uio_limit = uiop->uio_limit; 2544 tuio.uio_resid = size; 2545 2546 basep = tuio.uio_iov->iov_base; 2547 tuiop = &tuio; 2548 tflag = 1; 2549 } 2550 2551 error = rdip(ip, tuiop, 0, cr); 2552 if (!(error == 0 && ip->i_number == ino && ip->i_gen == igen)) { 2553 rw_exit(&ip->i_contents); 2554 rw_exit(&ip->i_rwlock); 2555 goto out; 2556 } 2557 2558 if (tflag == 0) 2559 size -= uiop->uio_resid; 2560 2561 if ((tflag == 0 && ip->i_size <= FSL_SIZE && 2562 ip->i_size == size) || (tflag == 1 && 2563 tuio.uio_resid == 0)) { 2564 error = kcopy(basep, &ip->i_db[1], ip->i_size); 2565 if (error == 0) { 2566 ip->i_flag |= IFASTSYMLNK; 2567 /* 2568 * free page 2569 */ 2570 (void) VOP_PUTPAGE(ITOV(ip), 2571 (offset_t)0, PAGESIZE, 2572 (B_DONTNEED | B_FREE | B_FORCE | B_ASYNC), 2573 cr, ct); 2574 } else { 2575 int i; 2576 /* error, clear garbage left behind */ 2577 for (i = 1; i < NDADDR; i++) 2578 ip->i_db[i] = 0; 2579 for (i = 0; i < NIADDR; i++) 2580 ip->i_ib[i] = 0; 2581 } 2582 } 2583 if (tflag == 1) { 2584 /* now, copy it into the user buffer */ 2585 error = uiomove((caddr_t)kbuf, 2586 MIN(size, uiop->uio_resid), 2587 UIO_READ, uiop); 2588 } 2589 rw_exit(&ip->i_contents); 2590 rw_exit(&ip->i_rwlock); 2591 } 2592 out: 2593 if (ulp) { 2594 ufs_lockfs_end(ulp); 2595 } 2596 nolockout: 2597 return (error); 2598 } 2599 2600 /* ARGSUSED */ 2601 static int 2602 ufs_fsync(struct vnode *vp, int syncflag, struct cred *cr, 2603 caller_context_t *ct) 2604 { 2605 struct inode *ip = VTOI(vp); 2606 struct ufsvfs *ufsvfsp = ip->i_ufsvfs; 2607 struct ulockfs *ulp; 2608 int error; 2609 2610 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_FSYNC_MASK); 2611 if (error) 2612 return (error); 2613 2614 if (TRANS_ISTRANS(ufsvfsp)) { 2615 /* 2616 * First push out any data pages 2617 */ 2618 if (vn_has_cached_data(vp) && !(syncflag & FNODSYNC) && 2619 (vp->v_type != VCHR) && !(IS_SWAPVP(vp))) { 2620 error = VOP_PUTPAGE(vp, (offset_t)0, (size_t)0, 2621 0, CRED(), ct); 2622 if (error) 2623 goto out; 2624 } 2625 2626 /* 2627 * Delta any delayed inode times updates 2628 * and push inode to log. 2629 * All other inode deltas will have already been delta'd 2630 * and will be pushed during the commit. 2631 */ 2632 if (!(syncflag & FDSYNC) && 2633 ((ip->i_flag & (IMOD|IMODACC)) == IMODACC)) { 2634 if (ulp) { 2635 TRANS_BEGIN_ASYNC(ufsvfsp, TOP_FSYNC, 2636 TOP_SYNCIP_SIZE); 2637 } 2638 rw_enter(&ip->i_contents, RW_READER); 2639 mutex_enter(&ip->i_tlock); 2640 ip->i_flag &= ~IMODTIME; 2641 mutex_exit(&ip->i_tlock); 2642 ufs_iupdat(ip, I_SYNC); 2643 rw_exit(&ip->i_contents); 2644 if (ulp) { 2645 TRANS_END_ASYNC(ufsvfsp, TOP_FSYNC, 2646 TOP_SYNCIP_SIZE); 2647 } 2648 } 2649 2650 /* 2651 * Commit the Moby transaction 2652 * 2653 * Deltas have already been made so we just need to 2654 * commit them with a synchronous transaction. 2655 * TRANS_BEGIN_SYNC() will return an error 2656 * if there are no deltas to commit, for an 2657 * empty transaction. 2658 */ 2659 if (ulp) { 2660 TRANS_BEGIN_SYNC(ufsvfsp, TOP_FSYNC, TOP_COMMIT_SIZE, 2661 error); 2662 if (error) { 2663 error = 0; /* commit wasn't needed */ 2664 goto out; 2665 } 2666 TRANS_END_SYNC(ufsvfsp, error, TOP_FSYNC, 2667 TOP_COMMIT_SIZE); 2668 } 2669 } else { /* not logging */ 2670 if (!(IS_SWAPVP(vp))) 2671 if (syncflag & FNODSYNC) { 2672 /* Just update the inode only */ 2673 TRANS_IUPDAT(ip, 1); 2674 error = 0; 2675 } else if (syncflag & FDSYNC) 2676 /* Do data-synchronous writes */ 2677 error = TRANS_SYNCIP(ip, 0, I_DSYNC, TOP_FSYNC); 2678 else 2679 /* Do synchronous writes */ 2680 error = TRANS_SYNCIP(ip, 0, I_SYNC, TOP_FSYNC); 2681 2682 rw_enter(&ip->i_contents, RW_WRITER); 2683 if (!error) 2684 error = ufs_sync_indir(ip); 2685 rw_exit(&ip->i_contents); 2686 } 2687 out: 2688 if (ulp) { 2689 ufs_lockfs_end(ulp); 2690 } 2691 return (error); 2692 } 2693 2694 /*ARGSUSED*/ 2695 static void 2696 ufs_inactive(struct vnode *vp, struct cred *cr, caller_context_t *ct) 2697 { 2698 ufs_iinactive(VTOI(vp)); 2699 } 2700 2701 /* 2702 * Unix file system operations having to do with directory manipulation. 2703 */ 2704 int ufs_lookup_idle_count = 2; /* Number of inodes to idle each time */ 2705 /* ARGSUSED */ 2706 static int 2707 ufs_lookup(struct vnode *dvp, char *nm, struct vnode **vpp, 2708 struct pathname *pnp, int flags, struct vnode *rdir, struct cred *cr, 2709 caller_context_t *ct, int *direntflags, pathname_t *realpnp) 2710 { 2711 struct inode *ip; 2712 struct inode *sip; 2713 struct inode *xip; 2714 struct ufsvfs *ufsvfsp; 2715 struct ulockfs *ulp; 2716 struct vnode *vp; 2717 int error; 2718 2719 /* 2720 * Check flags for type of lookup (regular file or attribute file) 2721 */ 2722 2723 ip = VTOI(dvp); 2724 2725 if (flags & LOOKUP_XATTR) { 2726 2727 /* 2728 * If not mounted with XATTR support then return EINVAL 2729 */ 2730 2731 if (!(ip->i_ufsvfs->vfs_vfs->vfs_flag & VFS_XATTR)) 2732 return (EINVAL); 2733 /* 2734 * We don't allow recursive attributes... 2735 * Maybe someday we will. 2736 */ 2737 if ((ip->i_cflags & IXATTR)) { 2738 return (EINVAL); 2739 } 2740 2741 if ((vp = dnlc_lookup(dvp, XATTR_DIR_NAME)) == NULL) { 2742 error = ufs_xattr_getattrdir(dvp, &sip, flags, cr); 2743 if (error) { 2744 *vpp = NULL; 2745 goto out; 2746 } 2747 2748 vp = ITOV(sip); 2749 dnlc_update(dvp, XATTR_DIR_NAME, vp); 2750 } 2751 2752 /* 2753 * Check accessibility of directory. 2754 */ 2755 if (vp == DNLC_NO_VNODE) { 2756 VN_RELE(vp); 2757 error = ENOENT; 2758 goto out; 2759 } 2760 if ((error = ufs_iaccess(VTOI(vp), IEXEC, cr)) != 0) { 2761 VN_RELE(vp); 2762 goto out; 2763 } 2764 2765 *vpp = vp; 2766 return (0); 2767 } 2768 2769 /* 2770 * Check for a null component, which we should treat as 2771 * looking at dvp from within it's parent, so we don't 2772 * need a call to ufs_iaccess(), as it has already been 2773 * done. 2774 */ 2775 if (nm[0] == 0) { 2776 VN_HOLD(dvp); 2777 error = 0; 2778 *vpp = dvp; 2779 goto out; 2780 } 2781 2782 /* 2783 * Check for "." ie itself. this is a quick check and 2784 * avoids adding "." into the dnlc (which have been seen 2785 * to occupy >10% of the cache). 2786 */ 2787 if ((nm[0] == '.') && (nm[1] == 0)) { 2788 /* 2789 * Don't return without checking accessibility 2790 * of the directory. We only need the lock if 2791 * we are going to return it. 2792 */ 2793 if ((error = ufs_iaccess(ip, IEXEC, cr)) == 0) { 2794 VN_HOLD(dvp); 2795 *vpp = dvp; 2796 } 2797 goto out; 2798 } 2799 2800 /* 2801 * Fast path: Check the directory name lookup cache. 2802 */ 2803 if (vp = dnlc_lookup(dvp, nm)) { 2804 /* 2805 * Check accessibility of directory. 2806 */ 2807 if ((error = ufs_iaccess(ip, IEXEC, cr)) != 0) { 2808 VN_RELE(vp); 2809 goto out; 2810 } 2811 if (vp == DNLC_NO_VNODE) { 2812 VN_RELE(vp); 2813 error = ENOENT; 2814 goto out; 2815 } 2816 xip = VTOI(vp); 2817 ulp = NULL; 2818 goto fastpath; 2819 } 2820 2821 /* 2822 * Keep the idle queue from getting too long by 2823 * idling two inodes before attempting to allocate another. 2824 * This operation must be performed before entering 2825 * lockfs or a transaction. 2826 */ 2827 if (ufs_idle_q.uq_ne > ufs_idle_q.uq_hiwat) 2828 if ((curthread->t_flag & T_DONTBLOCK) == 0) { 2829 ins.in_lidles.value.ul += ufs_lookup_idle_count; 2830 ufs_idle_some(ufs_lookup_idle_count); 2831 } 2832 2833 retry_lookup: 2834 ufsvfsp = ip->i_ufsvfs; 2835 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_LOOKUP_MASK); 2836 if (error) 2837 goto out; 2838 2839 error = ufs_dirlook(ip, nm, &xip, cr, 1); 2840 2841 fastpath: 2842 if (error == 0) { 2843 ip = xip; 2844 *vpp = ITOV(ip); 2845 2846 /* 2847 * If vnode is a device return special vnode instead. 2848 */ 2849 if (IS_DEVVP(*vpp)) { 2850 struct vnode *newvp; 2851 2852 newvp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, 2853 cr); 2854 VN_RELE(*vpp); 2855 if (newvp == NULL) 2856 error = ENOSYS; 2857 else 2858 *vpp = newvp; 2859 } else if (ip->i_cflags & ICOMPRESS) { 2860 struct vnode *newvp; 2861 2862 /* 2863 * Compressed file, substitute dcfs vnode 2864 */ 2865 newvp = decompvp(*vpp, cr, ct); 2866 VN_RELE(*vpp); 2867 if (newvp == NULL) 2868 error = ENOSYS; 2869 else 2870 *vpp = newvp; 2871 } 2872 } 2873 if (ulp) { 2874 ufs_lockfs_end(ulp); 2875 } 2876 2877 if (error == EAGAIN) 2878 goto retry_lookup; 2879 2880 out: 2881 return (error); 2882 } 2883 2884 /*ARGSUSED*/ 2885 static int 2886 ufs_create(struct vnode *dvp, char *name, struct vattr *vap, enum vcexcl excl, 2887 int mode, struct vnode **vpp, struct cred *cr, int flag, 2888 caller_context_t *ct, vsecattr_t *vsecp) 2889 { 2890 struct inode *ip; 2891 struct inode *xip; 2892 struct inode *dip; 2893 struct vnode *xvp; 2894 struct ufsvfs *ufsvfsp; 2895 struct ulockfs *ulp; 2896 int error; 2897 int issync; 2898 int truncflag; 2899 int trans_size; 2900 int noentry; 2901 int defer_dip_seq_update = 0; /* need to defer update of dip->i_seq */ 2902 int retry = 1; 2903 int indeadlock; 2904 2905 again: 2906 ip = VTOI(dvp); 2907 ufsvfsp = ip->i_ufsvfs; 2908 truncflag = 0; 2909 2910 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_CREATE_MASK); 2911 if (error) 2912 goto out; 2913 2914 if (ulp) { 2915 trans_size = (int)TOP_CREATE_SIZE(ip); 2916 TRANS_BEGIN_CSYNC(ufsvfsp, issync, TOP_CREATE, trans_size); 2917 } 2918 2919 if ((vap->va_mode & VSVTX) && secpolicy_vnode_stky_modify(cr) != 0) 2920 vap->va_mode &= ~VSVTX; 2921 2922 if (*name == '\0') { 2923 /* 2924 * Null component name refers to the directory itself. 2925 */ 2926 VN_HOLD(dvp); 2927 /* 2928 * Even though this is an error case, we need to grab the 2929 * quota lock since the error handling code below is common. 2930 */ 2931 rw_enter(&ufsvfsp->vfs_dqrwlock, RW_READER); 2932 rw_enter(&ip->i_contents, RW_WRITER); 2933 error = EEXIST; 2934 } else { 2935 xip = NULL; 2936 noentry = 0; 2937 /* 2938 * ufs_tryirwlock_trans uses rw_tryenter and checks for SLOCK 2939 * to avoid i_rwlock, ufs_lockfs_begin deadlock. If deadlock 2940 * possible, retries the operation. 2941 */ 2942 ufs_tryirwlock_trans(&ip->i_rwlock, RW_WRITER, TOP_CREATE, 2943 retry_dir); 2944 if (indeadlock) 2945 goto again; 2946 2947 xvp = dnlc_lookup(dvp, name); 2948 if (xvp == DNLC_NO_VNODE) { 2949 noentry = 1; 2950 VN_RELE(xvp); 2951 xvp = NULL; 2952 } 2953 if (xvp) { 2954 rw_exit(&ip->i_rwlock); 2955 if (error = ufs_iaccess(ip, IEXEC, cr)) { 2956 VN_RELE(xvp); 2957 } else { 2958 error = EEXIST; 2959 xip = VTOI(xvp); 2960 } 2961 } else { 2962 /* 2963 * Suppress file system full message if we will retry 2964 */ 2965 error = ufs_direnter_cm(ip, name, DE_CREATE, 2966 vap, &xip, cr, (noentry | (retry ? IQUIET : 0))); 2967 if (error == EAGAIN) { 2968 if (ulp) { 2969 TRANS_END_CSYNC(ufsvfsp, error, issync, 2970 TOP_CREATE, trans_size); 2971 ufs_lockfs_end(ulp); 2972 } 2973 goto again; 2974 } 2975 rw_exit(&ip->i_rwlock); 2976 } 2977 ip = xip; 2978 if (ip != NULL) { 2979 rw_enter(&ufsvfsp->vfs_dqrwlock, RW_READER); 2980 rw_enter(&ip->i_contents, RW_WRITER); 2981 } 2982 } 2983 2984 /* 2985 * If the file already exists and this is a non-exclusive create, 2986 * check permissions and allow access for non-directories. 2987 * Read-only create of an existing directory is also allowed. 2988 * We fail an exclusive create of anything which already exists. 2989 */ 2990 if (error == EEXIST) { 2991 dip = VTOI(dvp); 2992 if (excl == NONEXCL) { 2993 if ((((ip->i_mode & IFMT) == IFDIR) || 2994 ((ip->i_mode & IFMT) == IFATTRDIR)) && 2995 (mode & IWRITE)) 2996 error = EISDIR; 2997 else if (mode) 2998 error = ufs_iaccess(ip, mode, cr); 2999 else 3000 error = 0; 3001 } 3002 if (error) { 3003 rw_exit(&ip->i_contents); 3004 rw_exit(&ufsvfsp->vfs_dqrwlock); 3005 VN_RELE(ITOV(ip)); 3006 goto unlock; 3007 } 3008 /* 3009 * If the error EEXIST was set, then i_seq can not 3010 * have been updated. The sequence number interface 3011 * is defined such that a non-error VOP_CREATE must 3012 * increase the dir va_seq it by at least one. If we 3013 * have cleared the error, increase i_seq. Note that 3014 * we are increasing the dir i_seq and in rare cases 3015 * ip may actually be from the dvp, so we already have 3016 * the locks and it will not be subject to truncation. 3017 * In case we have to update i_seq of the parent 3018 * directory dip, we have to defer it till we have 3019 * released our locks on ip due to lock ordering requirements. 3020 */ 3021 if (ip != dip) 3022 defer_dip_seq_update = 1; 3023 else 3024 ip->i_seq++; 3025 3026 if (((ip->i_mode & IFMT) == IFREG) && 3027 (vap->va_mask & AT_SIZE) && vap->va_size == 0) { 3028 /* 3029 * Truncate regular files, if requested by caller. 3030 * Grab i_rwlock to make sure no one else is 3031 * currently writing to the file (we promised 3032 * bmap we would do this). 3033 * Must get the locks in the correct order. 3034 */ 3035 if (ip->i_size == 0) { 3036 ip->i_flag |= ICHG | IUPD; 3037 ip->i_seq++; 3038 TRANS_INODE(ufsvfsp, ip); 3039 } else { 3040 /* 3041 * Large Files: Why this check here? 3042 * Though we do it in vn_create() we really 3043 * want to guarantee that we do not destroy 3044 * Large file data by atomically checking 3045 * the size while holding the contents 3046 * lock. 3047 */ 3048 if (flag && !(flag & FOFFMAX) && 3049 ((ip->i_mode & IFMT) == IFREG) && 3050 (ip->i_size > (offset_t)MAXOFF32_T)) { 3051 rw_exit(&ip->i_contents); 3052 rw_exit(&ufsvfsp->vfs_dqrwlock); 3053 error = EOVERFLOW; 3054 goto unlock; 3055 } 3056 if (TRANS_ISTRANS(ufsvfsp)) 3057 truncflag++; 3058 else { 3059 rw_exit(&ip->i_contents); 3060 rw_exit(&ufsvfsp->vfs_dqrwlock); 3061 ufs_tryirwlock_trans(&ip->i_rwlock, 3062 RW_WRITER, TOP_CREATE, 3063 retry_file); 3064 if (indeadlock) { 3065 VN_RELE(ITOV(ip)); 3066 goto again; 3067 } 3068 rw_enter(&ufsvfsp->vfs_dqrwlock, 3069 RW_READER); 3070 rw_enter(&ip->i_contents, RW_WRITER); 3071 (void) ufs_itrunc(ip, (u_offset_t)0, 0, 3072 cr); 3073 rw_exit(&ip->i_rwlock); 3074 } 3075 3076 } 3077 if (error == 0) { 3078 vnevent_create(ITOV(ip), ct); 3079 } 3080 } 3081 } 3082 3083 if (error) { 3084 if (ip != NULL) { 3085 rw_exit(&ufsvfsp->vfs_dqrwlock); 3086 rw_exit(&ip->i_contents); 3087 } 3088 goto unlock; 3089 } 3090 3091 *vpp = ITOV(ip); 3092 ITIMES(ip); 3093 rw_exit(&ip->i_contents); 3094 rw_exit(&ufsvfsp->vfs_dqrwlock); 3095 3096 /* 3097 * If vnode is a device return special vnode instead. 3098 */ 3099 if (!error && IS_DEVVP(*vpp)) { 3100 struct vnode *newvp; 3101 3102 newvp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr); 3103 VN_RELE(*vpp); 3104 if (newvp == NULL) { 3105 error = ENOSYS; 3106 goto unlock; 3107 } 3108 truncflag = 0; 3109 *vpp = newvp; 3110 } 3111 unlock: 3112 3113 /* 3114 * Do the deferred update of the parent directory's sequence 3115 * number now. 3116 */ 3117 if (defer_dip_seq_update == 1) { 3118 rw_enter(&dip->i_contents, RW_READER); 3119 mutex_enter(&dip->i_tlock); 3120 dip->i_seq++; 3121 mutex_exit(&dip->i_tlock); 3122 rw_exit(&dip->i_contents); 3123 } 3124 3125 if (ulp) { 3126 int terr = 0; 3127 3128 TRANS_END_CSYNC(ufsvfsp, terr, issync, TOP_CREATE, 3129 trans_size); 3130 3131 /* 3132 * If we haven't had a more interesting failure 3133 * already, then anything that might've happened 3134 * here should be reported. 3135 */ 3136 if (error == 0) 3137 error = terr; 3138 } 3139 3140 if (!error && truncflag) { 3141 ufs_tryirwlock(&ip->i_rwlock, RW_WRITER, retry_trunc); 3142 if (indeadlock) { 3143 if (ulp) 3144 ufs_lockfs_end(ulp); 3145 VN_RELE(ITOV(ip)); 3146 goto again; 3147 } 3148 (void) TRANS_ITRUNC(ip, (u_offset_t)0, 0, cr); 3149 rw_exit(&ip->i_rwlock); 3150 } 3151 3152 if (ulp) 3153 ufs_lockfs_end(ulp); 3154 3155 /* 3156 * If no inodes available, try to free one up out of the 3157 * pending delete queue. 3158 */ 3159 if ((error == ENOSPC) && retry && TRANS_ISTRANS(ufsvfsp)) { 3160 ufs_delete_drain_wait(ufsvfsp, 1); 3161 retry = 0; 3162 goto again; 3163 } 3164 3165 out: 3166 return (error); 3167 } 3168 3169 extern int ufs_idle_max; 3170 /*ARGSUSED*/ 3171 static int 3172 ufs_remove(struct vnode *vp, char *nm, struct cred *cr, 3173 caller_context_t *ct, int flags) 3174 { 3175 struct inode *ip = VTOI(vp); 3176 struct ufsvfs *ufsvfsp = ip->i_ufsvfs; 3177 struct ulockfs *ulp; 3178 vnode_t *rmvp = NULL; /* Vnode corresponding to name being removed */ 3179 int indeadlock; 3180 int error; 3181 int issync; 3182 int trans_size; 3183 3184 /* 3185 * don't let the delete queue get too long 3186 */ 3187 if (ufsvfsp == NULL) { 3188 error = EIO; 3189 goto out; 3190 } 3191 if (ufsvfsp->vfs_delete.uq_ne > ufs_idle_max) 3192 ufs_delete_drain(vp->v_vfsp, 1, 1); 3193 3194 retry_remove: 3195 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_REMOVE_MASK); 3196 if (error) 3197 goto out; 3198 3199 if (ulp) 3200 TRANS_BEGIN_CSYNC(ufsvfsp, issync, TOP_REMOVE, 3201 trans_size = (int)TOP_REMOVE_SIZE(VTOI(vp))); 3202 3203 /* 3204 * ufs_tryirwlock_trans uses rw_tryenter and checks for SLOCK 3205 * to avoid i_rwlock, ufs_lockfs_begin deadlock. If deadlock 3206 * possible, retries the operation. 3207 */ 3208 ufs_tryirwlock_trans(&ip->i_rwlock, RW_WRITER, TOP_REMOVE, retry); 3209 if (indeadlock) 3210 goto retry_remove; 3211 error = ufs_dirremove(ip, nm, (struct inode *)0, (struct vnode *)0, 3212 DR_REMOVE, cr, &rmvp); 3213 rw_exit(&ip->i_rwlock); 3214 3215 if (ulp) { 3216 TRANS_END_CSYNC(ufsvfsp, error, issync, TOP_REMOVE, trans_size); 3217 ufs_lockfs_end(ulp); 3218 } 3219 3220 /* 3221 * This must be called after the remove transaction is closed. 3222 */ 3223 if (rmvp != NULL) { 3224 /* Only send the event if there were no errors */ 3225 if (error == 0) 3226 vnevent_remove(rmvp, vp, nm, ct); 3227 VN_RELE(rmvp); 3228 } 3229 out: 3230 return (error); 3231 } 3232 3233 /* 3234 * Link a file or a directory. Only privileged processes are allowed to 3235 * make links to directories. 3236 */ 3237 /*ARGSUSED*/ 3238 static int 3239 ufs_link(struct vnode *tdvp, struct vnode *svp, char *tnm, struct cred *cr, 3240 caller_context_t *ct, int flags) 3241 { 3242 struct inode *sip; 3243 struct inode *tdp = VTOI(tdvp); 3244 struct ufsvfs *ufsvfsp = tdp->i_ufsvfs; 3245 struct ulockfs *ulp; 3246 struct vnode *realvp; 3247 int error; 3248 int issync; 3249 int trans_size; 3250 int isdev; 3251 int indeadlock; 3252 3253 retry_link: 3254 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_LINK_MASK); 3255 if (error) 3256 goto out; 3257 3258 if (ulp) 3259 TRANS_BEGIN_CSYNC(ufsvfsp, issync, TOP_LINK, 3260 trans_size = (int)TOP_LINK_SIZE(VTOI(tdvp))); 3261 3262 if (VOP_REALVP(svp, &realvp, ct) == 0) 3263 svp = realvp; 3264 3265 /* 3266 * Make sure link for extended attributes is valid 3267 * We only support hard linking of attr in ATTRDIR to ATTRDIR 3268 * 3269 * Make certain we don't attempt to look at a device node as 3270 * a ufs inode. 3271 */ 3272 3273 isdev = IS_DEVVP(svp); 3274 if (((isdev == 0) && ((VTOI(svp)->i_cflags & IXATTR) == 0) && 3275 ((tdp->i_mode & IFMT) == IFATTRDIR)) || 3276 ((isdev == 0) && (VTOI(svp)->i_cflags & IXATTR) && 3277 ((tdp->i_mode & IFMT) == IFDIR))) { 3278 error = EINVAL; 3279 goto unlock; 3280 } 3281 3282 sip = VTOI(svp); 3283 if ((svp->v_type == VDIR && 3284 secpolicy_fs_linkdir(cr, ufsvfsp->vfs_vfs) != 0) || 3285 (sip->i_uid != crgetuid(cr) && secpolicy_basic_link(cr) != 0)) { 3286 error = EPERM; 3287 goto unlock; 3288 } 3289 3290 /* 3291 * ufs_tryirwlock_trans uses rw_tryenter and checks for SLOCK 3292 * to avoid i_rwlock, ufs_lockfs_begin deadlock. If deadlock 3293 * possible, retries the operation. 3294 */ 3295 ufs_tryirwlock_trans(&tdp->i_rwlock, RW_WRITER, TOP_LINK, retry); 3296 if (indeadlock) 3297 goto retry_link; 3298 error = ufs_direnter_lr(tdp, tnm, DE_LINK, (struct inode *)0, 3299 sip, cr, NULL); 3300 rw_exit(&tdp->i_rwlock); 3301 3302 unlock: 3303 if (ulp) { 3304 TRANS_END_CSYNC(ufsvfsp, error, issync, TOP_LINK, trans_size); 3305 ufs_lockfs_end(ulp); 3306 } 3307 3308 if (!error) { 3309 vnevent_link(svp, ct); 3310 } 3311 out: 3312 return (error); 3313 } 3314 3315 uint64_t ufs_rename_retry_cnt; 3316 uint64_t ufs_rename_upgrade_retry_cnt; 3317 uint64_t ufs_rename_dircheck_retry_cnt; 3318 clock_t ufs_rename_backoff_delay = 1; 3319 3320 /* 3321 * Rename a file or directory. 3322 * We are given the vnode and entry string of the source and the 3323 * vnode and entry string of the place we want to move the source 3324 * to (the target). The essential operation is: 3325 * unlink(target); 3326 * link(source, target); 3327 * unlink(source); 3328 * but "atomically". Can't do full commit without saving state in 3329 * the inode on disk, which isn't feasible at this time. Best we 3330 * can do is always guarantee that the TARGET exists. 3331 */ 3332 3333 /*ARGSUSED*/ 3334 static int 3335 ufs_rename( 3336 struct vnode *sdvp, /* old (source) parent vnode */ 3337 char *snm, /* old (source) entry name */ 3338 struct vnode *tdvp, /* new (target) parent vnode */ 3339 char *tnm, /* new (target) entry name */ 3340 struct cred *cr, 3341 caller_context_t *ct, 3342 int flags) 3343 { 3344 struct inode *sip = NULL; /* source inode */ 3345 struct inode *ip = NULL; /* check inode */ 3346 struct inode *sdp; /* old (source) parent inode */ 3347 struct inode *tdp; /* new (target) parent inode */ 3348 struct vnode *tvp = NULL; /* target vnode, if it exists */ 3349 struct vnode *realvp; 3350 struct ufsvfs *ufsvfsp; 3351 struct ulockfs *ulp; 3352 struct ufs_slot slot; 3353 timestruc_t now; 3354 int error; 3355 int issync; 3356 int trans_size; 3357 krwlock_t *first_lock; 3358 krwlock_t *second_lock; 3359 krwlock_t *reverse_lock; 3360 3361 sdp = VTOI(sdvp); 3362 slot.fbp = NULL; 3363 ufsvfsp = sdp->i_ufsvfs; 3364 retry_rename: 3365 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_RENAME_MASK); 3366 if (error) 3367 goto out; 3368 3369 if (ulp) 3370 TRANS_BEGIN_CSYNC(ufsvfsp, issync, TOP_RENAME, 3371 trans_size = (int)TOP_RENAME_SIZE(sdp)); 3372 3373 if (VOP_REALVP(tdvp, &realvp, ct) == 0) 3374 tdvp = realvp; 3375 3376 tdp = VTOI(tdvp); 3377 3378 3379 /* 3380 * We only allow renaming of attributes from ATTRDIR to ATTRDIR. 3381 */ 3382 if ((tdp->i_mode & IFMT) != (sdp->i_mode & IFMT)) { 3383 error = EINVAL; 3384 goto unlock; 3385 } 3386 3387 /* 3388 * Look up inode of file we're supposed to rename. 3389 */ 3390 gethrestime(&now); 3391 if (error = ufs_dirlook(sdp, snm, &sip, cr, 0)) { 3392 if (error == EAGAIN) { 3393 if (ulp) { 3394 TRANS_END_CSYNC(ufsvfsp, error, issync, 3395 TOP_RENAME, trans_size); 3396 ufs_lockfs_end(ulp); 3397 } 3398 goto retry_rename; 3399 } 3400 3401 goto unlock; 3402 } 3403 3404 /* 3405 * Lock both the source and target directories (they may be 3406 * the same) to provide the atomicity semantics that was 3407 * previously provided by the per file system vfs_rename_lock 3408 * 3409 * with vfs_rename_lock removed to allow simultaneous renames 3410 * within a file system, ufs_dircheckpath can deadlock while 3411 * traversing back to ensure that source is not a parent directory 3412 * of target parent directory. This is because we get into 3413 * ufs_dircheckpath with the sdp and tdp locks held as RW_WRITER. 3414 * If the tdp and sdp of the simultaneous renames happen to be 3415 * in the path of each other, it can lead to a deadlock. This 3416 * can be avoided by getting the locks as RW_READER here and then 3417 * upgrading to RW_WRITER after completing the ufs_dircheckpath. 3418 * 3419 * We hold the target directory's i_rwlock after calling 3420 * ufs_lockfs_begin but in many other operations (like ufs_readdir) 3421 * VOP_RWLOCK is explicitly called by the filesystem independent code 3422 * before calling the file system operation. In these cases the order 3423 * is reversed (i.e i_rwlock is taken first and then ufs_lockfs_begin 3424 * is called). This is fine as long as ufs_lockfs_begin acts as a VOP 3425 * counter but with ufs_quiesce setting the SLOCK bit this becomes a 3426 * synchronizing object which might lead to a deadlock. So we use 3427 * rw_tryenter instead of rw_enter. If we fail to get this lock and 3428 * find that SLOCK bit is set, we call ufs_lockfs_end and restart the 3429 * operation. 3430 */ 3431 retry: 3432 first_lock = &tdp->i_rwlock; 3433 second_lock = &sdp->i_rwlock; 3434 retry_firstlock: 3435 if (!rw_tryenter(first_lock, RW_READER)) { 3436 /* 3437 * We didn't get the lock. Check if the SLOCK is set in the 3438 * ufsvfs. If yes, we might be in a deadlock. Safer to give up 3439 * and wait for SLOCK to be cleared. 3440 */ 3441 3442 if (ulp && ULOCKFS_IS_SLOCK(ulp)) { 3443 TRANS_END_CSYNC(ufsvfsp, error, issync, TOP_RENAME, 3444 trans_size); 3445 ufs_lockfs_end(ulp); 3446 goto retry_rename; 3447 3448 } else { 3449 /* 3450 * SLOCK isn't set so this is a genuine synchronization 3451 * case. Let's try again after giving them a breather. 3452 */ 3453 delay(RETRY_LOCK_DELAY); 3454 goto retry_firstlock; 3455 } 3456 } 3457 /* 3458 * Need to check if the tdp and sdp are same !!! 3459 */ 3460 if ((tdp != sdp) && (!rw_tryenter(second_lock, RW_READER))) { 3461 /* 3462 * We didn't get the lock. Check if the SLOCK is set in the 3463 * ufsvfs. If yes, we might be in a deadlock. Safer to give up 3464 * and wait for SLOCK to be cleared. 3465 */ 3466 3467 rw_exit(first_lock); 3468 if (ulp && ULOCKFS_IS_SLOCK(ulp)) { 3469 TRANS_END_CSYNC(ufsvfsp, error, issync, TOP_RENAME, 3470 trans_size); 3471 ufs_lockfs_end(ulp); 3472 goto retry_rename; 3473 3474 } else { 3475 /* 3476 * So we couldn't get the second level peer lock *and* 3477 * the SLOCK bit isn't set. Too bad we can be 3478 * contentding with someone wanting these locks otherway 3479 * round. Reverse the locks in case there is a heavy 3480 * contention for the second level lock. 3481 */ 3482 reverse_lock = first_lock; 3483 first_lock = second_lock; 3484 second_lock = reverse_lock; 3485 ufs_rename_retry_cnt++; 3486 goto retry_firstlock; 3487 } 3488 } 3489 3490 if (sip == tdp) { 3491 error = EINVAL; 3492 goto errout; 3493 } 3494 /* 3495 * Make sure we can delete the source entry. This requires 3496 * write permission on the containing directory. 3497 * Check for sticky directories. 3498 */ 3499 rw_enter(&sdp->i_contents, RW_READER); 3500 rw_enter(&sip->i_contents, RW_READER); 3501 if ((error = ufs_iaccess(sdp, IWRITE, cr)) != 0 || 3502 (error = ufs_sticky_remove_access(sdp, sip, cr)) != 0) { 3503 rw_exit(&sip->i_contents); 3504 rw_exit(&sdp->i_contents); 3505 goto errout; 3506 } 3507 3508 /* 3509 * If this is a rename of a directory and the parent is 3510 * different (".." must be changed), then the source 3511 * directory must not be in the directory hierarchy 3512 * above the target, as this would orphan everything 3513 * below the source directory. Also the user must have 3514 * write permission in the source so as to be able to 3515 * change "..". 3516 */ 3517 if ((((sip->i_mode & IFMT) == IFDIR) || 3518 ((sip->i_mode & IFMT) == IFATTRDIR)) && sdp != tdp) { 3519 ino_t inum; 3520 3521 if ((error = ufs_iaccess(sip, IWRITE, cr))) { 3522 rw_exit(&sip->i_contents); 3523 rw_exit(&sdp->i_contents); 3524 goto errout; 3525 } 3526 inum = sip->i_number; 3527 rw_exit(&sip->i_contents); 3528 rw_exit(&sdp->i_contents); 3529 if ((error = ufs_dircheckpath(inum, tdp, sdp, cr))) { 3530 /* 3531 * If we got EAGAIN ufs_dircheckpath detected a 3532 * potential deadlock and backed out. We need 3533 * to retry the operation since sdp and tdp have 3534 * to be released to avoid the deadlock. 3535 */ 3536 if (error == EAGAIN) { 3537 rw_exit(&tdp->i_rwlock); 3538 if (tdp != sdp) 3539 rw_exit(&sdp->i_rwlock); 3540 delay(ufs_rename_backoff_delay); 3541 ufs_rename_dircheck_retry_cnt++; 3542 goto retry; 3543 } 3544 goto errout; 3545 } 3546 } else { 3547 rw_exit(&sip->i_contents); 3548 rw_exit(&sdp->i_contents); 3549 } 3550 3551 3552 /* 3553 * Check for renaming '.' or '..' or alias of '.' 3554 */ 3555 if (strcmp(snm, ".") == 0 || strcmp(snm, "..") == 0 || sdp == sip) { 3556 error = EINVAL; 3557 goto errout; 3558 } 3559 3560 /* 3561 * Simultaneous renames can deadlock in ufs_dircheckpath since it 3562 * tries to traverse back the file tree with both tdp and sdp held 3563 * as RW_WRITER. To avoid that we have to hold the tdp and sdp locks 3564 * as RW_READERS till ufs_dircheckpath is done. 3565 * Now that ufs_dircheckpath is done with, we can upgrade the locks 3566 * to RW_WRITER. 3567 */ 3568 if (!rw_tryupgrade(&tdp->i_rwlock)) { 3569 /* 3570 * The upgrade failed. We got to give away the lock 3571 * as to avoid deadlocking with someone else who is 3572 * waiting for writer lock. With the lock gone, we 3573 * cannot be sure the checks done above will hold 3574 * good when we eventually get them back as writer. 3575 * So if we can't upgrade we drop the locks and retry 3576 * everything again. 3577 */ 3578 rw_exit(&tdp->i_rwlock); 3579 if (tdp != sdp) 3580 rw_exit(&sdp->i_rwlock); 3581 delay(ufs_rename_backoff_delay); 3582 ufs_rename_upgrade_retry_cnt++; 3583 goto retry; 3584 } 3585 if (tdp != sdp) { 3586 if (!rw_tryupgrade(&sdp->i_rwlock)) { 3587 /* 3588 * The upgrade failed. We got to give away the lock 3589 * as to avoid deadlocking with someone else who is 3590 * waiting for writer lock. With the lock gone, we 3591 * cannot be sure the checks done above will hold 3592 * good when we eventually get them back as writer. 3593 * So if we can't upgrade we drop the locks and retry 3594 * everything again. 3595 */ 3596 rw_exit(&tdp->i_rwlock); 3597 rw_exit(&sdp->i_rwlock); 3598 delay(ufs_rename_backoff_delay); 3599 ufs_rename_upgrade_retry_cnt++; 3600 goto retry; 3601 } 3602 } 3603 3604 /* 3605 * Now that all the locks are held check to make sure another thread 3606 * didn't slip in and take out the sip. 3607 */ 3608 slot.status = NONE; 3609 if ((sip->i_ctime.tv_usec * 1000) > now.tv_nsec || 3610 sip->i_ctime.tv_sec > now.tv_sec) { 3611 rw_enter(&sdp->i_ufsvfs->vfs_dqrwlock, RW_READER); 3612 rw_enter(&sdp->i_contents, RW_WRITER); 3613 error = ufs_dircheckforname(sdp, snm, strlen(snm), &slot, 3614 &ip, cr, 0); 3615 rw_exit(&sdp->i_contents); 3616 rw_exit(&sdp->i_ufsvfs->vfs_dqrwlock); 3617 if (error) { 3618 goto errout; 3619 } 3620 if (ip == NULL) { 3621 error = ENOENT; 3622 goto errout; 3623 } else { 3624 /* 3625 * If the inode was found need to drop the v_count 3626 * so as not to keep the filesystem from being 3627 * unmounted at a later time. 3628 */ 3629 VN_RELE(ITOV(ip)); 3630 } 3631 3632 /* 3633 * Release the slot.fbp that has the page mapped and 3634 * locked SE_SHARED, and could be used in in 3635 * ufs_direnter_lr() which needs to get the SE_EXCL lock 3636 * on said page. 3637 */ 3638 if (slot.fbp) { 3639 fbrelse(slot.fbp, S_OTHER); 3640 slot.fbp = NULL; 3641 } 3642 } 3643 3644 /* 3645 * Link source to the target. If a target exists, return its 3646 * vnode pointer in tvp. We'll release it after sending the 3647 * vnevent. 3648 */ 3649 if (error = ufs_direnter_lr(tdp, tnm, DE_RENAME, sdp, sip, cr, &tvp)) { 3650 /* 3651 * ESAME isn't really an error; it indicates that the 3652 * operation should not be done because the source and target 3653 * are the same file, but that no error should be reported. 3654 */ 3655 if (error == ESAME) 3656 error = 0; 3657 goto errout; 3658 } 3659 3660 /* 3661 * Unlink the source. 3662 * Remove the source entry. ufs_dirremove() checks that the entry 3663 * still reflects sip, and returns an error if it doesn't. 3664 * If the entry has changed just forget about it. Release 3665 * the source inode. 3666 */ 3667 if ((error = ufs_dirremove(sdp, snm, sip, (struct vnode *)0, 3668 DR_RENAME, cr, NULL)) == ENOENT) 3669 error = 0; 3670 3671 errout: 3672 if (slot.fbp) 3673 fbrelse(slot.fbp, S_OTHER); 3674 3675 rw_exit(&tdp->i_rwlock); 3676 if (sdp != tdp) { 3677 rw_exit(&sdp->i_rwlock); 3678 } 3679 3680 unlock: 3681 if (ulp) { 3682 TRANS_END_CSYNC(ufsvfsp, error, issync, TOP_RENAME, trans_size); 3683 ufs_lockfs_end(ulp); 3684 } 3685 3686 /* 3687 * If no errors, send the appropriate events on the source 3688 * and destination (a.k.a, target) vnodes, if they exist. 3689 * This has to be done after the rename transaction has closed. 3690 */ 3691 if (error == 0) { 3692 if (tvp != NULL) 3693 vnevent_rename_dest(tvp, tdvp, tnm, ct); 3694 3695 /* 3696 * Notify the target directory of the rename event 3697 * if source and target directories are not same. 3698 */ 3699 if (sdvp != tdvp) 3700 vnevent_rename_dest_dir(tdvp, ct); 3701 3702 /* 3703 * Note that if ufs_direnter_lr() returned ESAME then 3704 * this event will still be sent. This isn't expected 3705 * to be a problem for anticipated usage by consumers. 3706 */ 3707 if (sip != NULL) 3708 vnevent_rename_src(ITOV(sip), sdvp, snm, ct); 3709 } 3710 3711 if (tvp != NULL) 3712 VN_RELE(tvp); 3713 3714 if (sip != NULL) 3715 VN_RELE(ITOV(sip)); 3716 3717 out: 3718 return (error); 3719 } 3720 3721 /*ARGSUSED*/ 3722 static int 3723 ufs_mkdir(struct vnode *dvp, char *dirname, struct vattr *vap, 3724 struct vnode **vpp, struct cred *cr, caller_context_t *ct, int flags, 3725 vsecattr_t *vsecp) 3726 { 3727 struct inode *ip; 3728 struct inode *xip; 3729 struct ufsvfs *ufsvfsp; 3730 struct ulockfs *ulp; 3731 int error; 3732 int issync; 3733 int trans_size; 3734 int indeadlock; 3735 int retry = 1; 3736 3737 ASSERT((vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE)); 3738 3739 /* 3740 * Can't make directory in attr hidden dir 3741 */ 3742 if ((VTOI(dvp)->i_mode & IFMT) == IFATTRDIR) 3743 return (EINVAL); 3744 3745 again: 3746 ip = VTOI(dvp); 3747 ufsvfsp = ip->i_ufsvfs; 3748 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_MKDIR_MASK); 3749 if (error) 3750 goto out; 3751 if (ulp) 3752 TRANS_BEGIN_CSYNC(ufsvfsp, issync, TOP_MKDIR, 3753 trans_size = (int)TOP_MKDIR_SIZE(ip)); 3754 3755 /* 3756 * ufs_tryirwlock_trans uses rw_tryenter and checks for SLOCK 3757 * to avoid i_rwlock, ufs_lockfs_begin deadlock. If deadlock 3758 * possible, retries the operation. 3759 */ 3760 ufs_tryirwlock_trans(&ip->i_rwlock, RW_WRITER, TOP_MKDIR, retry); 3761 if (indeadlock) 3762 goto again; 3763 3764 error = ufs_direnter_cm(ip, dirname, DE_MKDIR, vap, &xip, cr, 3765 (retry ? IQUIET : 0)); 3766 if (error == EAGAIN) { 3767 if (ulp) { 3768 TRANS_END_CSYNC(ufsvfsp, error, issync, TOP_MKDIR, 3769 trans_size); 3770 ufs_lockfs_end(ulp); 3771 } 3772 goto again; 3773 } 3774 3775 rw_exit(&ip->i_rwlock); 3776 if (error == 0) { 3777 ip = xip; 3778 *vpp = ITOV(ip); 3779 } else if (error == EEXIST) 3780 VN_RELE(ITOV(xip)); 3781 3782 if (ulp) { 3783 int terr = 0; 3784 TRANS_END_CSYNC(ufsvfsp, terr, issync, TOP_MKDIR, trans_size); 3785 ufs_lockfs_end(ulp); 3786 if (error == 0) 3787 error = terr; 3788 } 3789 out: 3790 if ((error == ENOSPC) && retry && TRANS_ISTRANS(ufsvfsp)) { 3791 ufs_delete_drain_wait(ufsvfsp, 1); 3792 retry = 0; 3793 goto again; 3794 } 3795 3796 return (error); 3797 } 3798 3799 /*ARGSUSED*/ 3800 static int 3801 ufs_rmdir(struct vnode *vp, char *nm, struct vnode *cdir, struct cred *cr, 3802 caller_context_t *ct, int flags) 3803 { 3804 struct inode *ip = VTOI(vp); 3805 struct ufsvfs *ufsvfsp = ip->i_ufsvfs; 3806 struct ulockfs *ulp; 3807 vnode_t *rmvp = NULL; /* Vnode of removed directory */ 3808 int error; 3809 int issync; 3810 int trans_size; 3811 int indeadlock; 3812 3813 /* 3814 * don't let the delete queue get too long 3815 */ 3816 if (ufsvfsp == NULL) { 3817 error = EIO; 3818 goto out; 3819 } 3820 if (ufsvfsp->vfs_delete.uq_ne > ufs_idle_max) 3821 ufs_delete_drain(vp->v_vfsp, 1, 1); 3822 3823 retry_rmdir: 3824 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_RMDIR_MASK); 3825 if (error) 3826 goto out; 3827 3828 if (ulp) 3829 TRANS_BEGIN_CSYNC(ufsvfsp, issync, TOP_RMDIR, 3830 trans_size = TOP_RMDIR_SIZE); 3831 3832 /* 3833 * ufs_tryirwlock_trans uses rw_tryenter and checks for SLOCK 3834 * to avoid i_rwlock, ufs_lockfs_begin deadlock. If deadlock 3835 * possible, retries the operation. 3836 */ 3837 ufs_tryirwlock_trans(&ip->i_rwlock, RW_WRITER, TOP_RMDIR, retry); 3838 if (indeadlock) 3839 goto retry_rmdir; 3840 error = ufs_dirremove(ip, nm, (struct inode *)0, cdir, DR_RMDIR, cr, 3841 &rmvp); 3842 rw_exit(&ip->i_rwlock); 3843 3844 if (ulp) { 3845 TRANS_END_CSYNC(ufsvfsp, error, issync, TOP_RMDIR, 3846 trans_size); 3847 ufs_lockfs_end(ulp); 3848 } 3849 3850 /* 3851 * This must be done AFTER the rmdir transaction has closed. 3852 */ 3853 if (rmvp != NULL) { 3854 /* Only send the event if there were no errors */ 3855 if (error == 0) 3856 vnevent_rmdir(rmvp, vp, nm, ct); 3857 VN_RELE(rmvp); 3858 } 3859 out: 3860 return (error); 3861 } 3862 3863 /* ARGSUSED */ 3864 static int 3865 ufs_readdir( 3866 struct vnode *vp, 3867 struct uio *uiop, 3868 struct cred *cr, 3869 int *eofp, 3870 caller_context_t *ct, 3871 int flags) 3872 { 3873 struct iovec *iovp; 3874 struct inode *ip; 3875 struct direct *idp; 3876 struct dirent64 *odp; 3877 struct fbuf *fbp; 3878 struct ufsvfs *ufsvfsp; 3879 struct ulockfs *ulp; 3880 caddr_t outbuf; 3881 size_t bufsize; 3882 uint_t offset; 3883 uint_t bytes_wanted, total_bytes_wanted; 3884 int incount = 0; 3885 int outcount = 0; 3886 int error; 3887 3888 ip = VTOI(vp); 3889 ASSERT(RW_READ_HELD(&ip->i_rwlock)); 3890 3891 if (uiop->uio_loffset >= MAXOFF32_T) { 3892 if (eofp) 3893 *eofp = 1; 3894 return (0); 3895 } 3896 3897 /* 3898 * Check if we have been called with a valid iov_len 3899 * and bail out if not, otherwise we may potentially loop 3900 * forever further down. 3901 */ 3902 if (uiop->uio_iov->iov_len <= 0) { 3903 error = EINVAL; 3904 goto out; 3905 } 3906 3907 /* 3908 * Large Files: When we come here we are guaranteed that 3909 * uio_offset can be used safely. The high word is zero. 3910 */ 3911 3912 ufsvfsp = ip->i_ufsvfs; 3913 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_READDIR_MASK); 3914 if (error) 3915 goto out; 3916 3917 iovp = uiop->uio_iov; 3918 total_bytes_wanted = iovp->iov_len; 3919 3920 /* Large Files: directory files should not be "large" */ 3921 3922 ASSERT(ip->i_size <= MAXOFF32_T); 3923 3924 /* Force offset to be valid (to guard against bogus lseek() values) */ 3925 offset = (uint_t)uiop->uio_offset & ~(DIRBLKSIZ - 1); 3926 3927 /* Quit if at end of file or link count of zero (posix) */ 3928 if (offset >= (uint_t)ip->i_size || ip->i_nlink <= 0) { 3929 if (eofp) 3930 *eofp = 1; 3931 error = 0; 3932 goto unlock; 3933 } 3934 3935 /* 3936 * Get space to change directory entries into fs independent format. 3937 * Do fast alloc for the most commonly used-request size (filesystem 3938 * block size). 3939 */ 3940 if (uiop->uio_segflg != UIO_SYSSPACE || uiop->uio_iovcnt != 1) { 3941 bufsize = total_bytes_wanted; 3942 outbuf = kmem_alloc(bufsize, KM_SLEEP); 3943 odp = (struct dirent64 *)outbuf; 3944 } else { 3945 bufsize = total_bytes_wanted; 3946 odp = (struct dirent64 *)iovp->iov_base; 3947 } 3948 3949 nextblk: 3950 bytes_wanted = total_bytes_wanted; 3951 3952 /* Truncate request to file size */ 3953 if (offset + bytes_wanted > (int)ip->i_size) 3954 bytes_wanted = (int)(ip->i_size - offset); 3955 3956 /* Comply with MAXBSIZE boundary restrictions of fbread() */ 3957 if ((offset & MAXBOFFSET) + bytes_wanted > MAXBSIZE) 3958 bytes_wanted = MAXBSIZE - (offset & MAXBOFFSET); 3959 3960 /* 3961 * Read in the next chunk. 3962 * We are still holding the i_rwlock. 3963 */ 3964 error = fbread(vp, (offset_t)offset, bytes_wanted, S_OTHER, &fbp); 3965 3966 if (error) 3967 goto update_inode; 3968 if (!ULOCKFS_IS_NOIACC(ITOUL(ip)) && (ip->i_fs->fs_ronly == 0) && 3969 (!ufsvfsp->vfs_noatime)) { 3970 ip->i_flag |= IACC; 3971 } 3972 incount = 0; 3973 idp = (struct direct *)fbp->fb_addr; 3974 if (idp->d_ino == 0 && idp->d_reclen == 0 && idp->d_namlen == 0) { 3975 cmn_err(CE_WARN, "ufs_readdir: bad dir, inumber = %llu, " 3976 "fs = %s\n", 3977 (u_longlong_t)ip->i_number, ufsvfsp->vfs_fs->fs_fsmnt); 3978 fbrelse(fbp, S_OTHER); 3979 error = ENXIO; 3980 goto update_inode; 3981 } 3982 /* Transform to file-system independent format */ 3983 while (incount < bytes_wanted) { 3984 /* 3985 * If the current directory entry is mangled, then skip 3986 * to the next block. It would be nice to set the FSBAD 3987 * flag in the super-block so that a fsck is forced on 3988 * next reboot, but locking is a problem. 3989 */ 3990 if (idp->d_reclen & 0x3) { 3991 offset = (offset + DIRBLKSIZ) & ~(DIRBLKSIZ-1); 3992 break; 3993 } 3994 3995 /* Skip to requested offset and skip empty entries */ 3996 if (idp->d_ino != 0 && offset >= (uint_t)uiop->uio_offset) { 3997 ushort_t this_reclen = 3998 DIRENT64_RECLEN(idp->d_namlen); 3999 /* Buffer too small for any entries */ 4000 if (!outcount && this_reclen > bufsize) { 4001 fbrelse(fbp, S_OTHER); 4002 error = EINVAL; 4003 goto update_inode; 4004 } 4005 /* If would overrun the buffer, quit */ 4006 if (outcount + this_reclen > bufsize) { 4007 break; 4008 } 4009 /* Take this entry */ 4010 odp->d_ino = (ino64_t)idp->d_ino; 4011 odp->d_reclen = (ushort_t)this_reclen; 4012 odp->d_off = (offset_t)(offset + idp->d_reclen); 4013 4014 /* use strncpy(9f) to zero out uninitialized bytes */ 4015 4016 ASSERT(strlen(idp->d_name) + 1 <= 4017 DIRENT64_NAMELEN(this_reclen)); 4018 (void) strncpy(odp->d_name, idp->d_name, 4019 DIRENT64_NAMELEN(this_reclen)); 4020 outcount += odp->d_reclen; 4021 odp = (struct dirent64 *) 4022 ((intptr_t)odp + odp->d_reclen); 4023 ASSERT(outcount <= bufsize); 4024 } 4025 if (idp->d_reclen) { 4026 incount += idp->d_reclen; 4027 offset += idp->d_reclen; 4028 idp = (struct direct *)((intptr_t)idp + idp->d_reclen); 4029 } else { 4030 offset = (offset + DIRBLKSIZ) & ~(DIRBLKSIZ-1); 4031 break; 4032 } 4033 } 4034 /* Release the chunk */ 4035 fbrelse(fbp, S_OTHER); 4036 4037 /* Read whole block, but got no entries, read another if not eof */ 4038 4039 /* 4040 * Large Files: casting i_size to int here is not a problem 4041 * because directory sizes are always less than MAXOFF32_T. 4042 * See assertion above. 4043 */ 4044 4045 if (offset < (int)ip->i_size && !outcount) 4046 goto nextblk; 4047 4048 /* Copy out the entry data */ 4049 if (uiop->uio_segflg == UIO_SYSSPACE && uiop->uio_iovcnt == 1) { 4050 iovp->iov_base += outcount; 4051 iovp->iov_len -= outcount; 4052 uiop->uio_resid -= outcount; 4053 uiop->uio_offset = offset; 4054 } else if ((error = uiomove(outbuf, (long)outcount, UIO_READ, 4055 uiop)) == 0) 4056 uiop->uio_offset = offset; 4057 update_inode: 4058 ITIMES(ip); 4059 if (uiop->uio_segflg != UIO_SYSSPACE || uiop->uio_iovcnt != 1) 4060 kmem_free(outbuf, bufsize); 4061 4062 if (eofp && error == 0) 4063 *eofp = (uiop->uio_offset >= (int)ip->i_size); 4064 unlock: 4065 if (ulp) { 4066 ufs_lockfs_end(ulp); 4067 } 4068 out: 4069 return (error); 4070 } 4071 4072 /*ARGSUSED*/ 4073 static int 4074 ufs_symlink( 4075 struct vnode *dvp, /* ptr to parent dir vnode */ 4076 char *linkname, /* name of symbolic link */ 4077 struct vattr *vap, /* attributes */ 4078 char *target, /* target path */ 4079 struct cred *cr, /* user credentials */ 4080 caller_context_t *ct, 4081 int flags) 4082 { 4083 struct inode *ip, *dip = VTOI(dvp); 4084 struct ufsvfs *ufsvfsp = dip->i_ufsvfs; 4085 struct ulockfs *ulp; 4086 int error; 4087 int issync; 4088 int trans_size; 4089 int residual; 4090 int ioflag; 4091 int retry = 1; 4092 4093 /* 4094 * No symlinks in attrdirs at this time 4095 */ 4096 if ((VTOI(dvp)->i_mode & IFMT) == IFATTRDIR) 4097 return (EINVAL); 4098 4099 again: 4100 ip = (struct inode *)NULL; 4101 vap->va_type = VLNK; 4102 vap->va_rdev = 0; 4103 4104 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_SYMLINK_MASK); 4105 if (error) 4106 goto out; 4107 4108 if (ulp) 4109 TRANS_BEGIN_CSYNC(ufsvfsp, issync, TOP_SYMLINK, 4110 trans_size = (int)TOP_SYMLINK_SIZE(dip)); 4111 4112 /* 4113 * We must create the inode before the directory entry, to avoid 4114 * racing with readlink(). ufs_dirmakeinode requires that we 4115 * hold the quota lock as reader, and directory locks as writer. 4116 */ 4117 4118 rw_enter(&dip->i_rwlock, RW_WRITER); 4119 rw_enter(&ufsvfsp->vfs_dqrwlock, RW_READER); 4120 rw_enter(&dip->i_contents, RW_WRITER); 4121 4122 /* 4123 * Suppress any out of inodes messages if we will retry on 4124 * ENOSP 4125 */ 4126 if (retry) 4127 dip->i_flag |= IQUIET; 4128 4129 error = ufs_dirmakeinode(dip, &ip, vap, DE_SYMLINK, cr); 4130 4131 dip->i_flag &= ~IQUIET; 4132 4133 rw_exit(&dip->i_contents); 4134 rw_exit(&ufsvfsp->vfs_dqrwlock); 4135 rw_exit(&dip->i_rwlock); 4136 4137 if (error) 4138 goto unlock; 4139 4140 /* 4141 * OK. The inode has been created. Write out the data of the 4142 * symbolic link. Since symbolic links are metadata, and should 4143 * remain consistent across a system crash, we need to force the 4144 * data out synchronously. 4145 * 4146 * (This is a change from the semantics in earlier releases, which 4147 * only created symbolic links synchronously if the semi-documented 4148 * 'syncdir' option was set, or if we were being invoked by the NFS 4149 * server, which requires symbolic links to be created synchronously.) 4150 * 4151 * We need to pass in a pointer for the residual length; otherwise 4152 * ufs_rdwri() will always return EIO if it can't write the data, 4153 * even if the error was really ENOSPC or EDQUOT. 4154 */ 4155 4156 ioflag = FWRITE | FDSYNC; 4157 residual = 0; 4158 4159 rw_enter(&ufsvfsp->vfs_dqrwlock, RW_READER); 4160 rw_enter(&ip->i_contents, RW_WRITER); 4161 4162 /* 4163 * Suppress file system full messages if we will retry 4164 */ 4165 if (retry) 4166 ip->i_flag |= IQUIET; 4167 4168 error = ufs_rdwri(UIO_WRITE, ioflag, ip, target, strlen(target), 4169 (offset_t)0, UIO_SYSSPACE, &residual, cr); 4170 4171 ip->i_flag &= ~IQUIET; 4172 4173 if (error) { 4174 rw_exit(&ip->i_contents); 4175 rw_exit(&ufsvfsp->vfs_dqrwlock); 4176 goto remove; 4177 } 4178 4179 /* 4180 * If the link's data is small enough, we can cache it in the inode. 4181 * This is a "fast symbolic link". We don't use the first direct 4182 * block because that's actually used to point at the symbolic link's 4183 * contents on disk; but we know that none of the other direct or 4184 * indirect blocks can be used because symbolic links are restricted 4185 * to be smaller than a file system block. 4186 */ 4187 4188 ASSERT(MAXPATHLEN <= VBSIZE(ITOV(ip))); 4189 4190 if (ip->i_size > 0 && ip->i_size <= FSL_SIZE) { 4191 if (kcopy(target, &ip->i_db[1], ip->i_size) == 0) { 4192 ip->i_flag |= IFASTSYMLNK; 4193 } else { 4194 int i; 4195 /* error, clear garbage left behind */ 4196 for (i = 1; i < NDADDR; i++) 4197 ip->i_db[i] = 0; 4198 for (i = 0; i < NIADDR; i++) 4199 ip->i_ib[i] = 0; 4200 } 4201 } 4202 4203 rw_exit(&ip->i_contents); 4204 rw_exit(&ufsvfsp->vfs_dqrwlock); 4205 4206 /* 4207 * OK. We've successfully created the symbolic link. All that 4208 * remains is to insert it into the appropriate directory. 4209 */ 4210 4211 rw_enter(&dip->i_rwlock, RW_WRITER); 4212 error = ufs_direnter_lr(dip, linkname, DE_SYMLINK, NULL, ip, cr, NULL); 4213 rw_exit(&dip->i_rwlock); 4214 4215 /* 4216 * Fall through into remove-on-error code. We're either done, or we 4217 * need to remove the inode (if we couldn't insert it). 4218 */ 4219 4220 remove: 4221 if (error && (ip != NULL)) { 4222 rw_enter(&ip->i_contents, RW_WRITER); 4223 ip->i_nlink--; 4224 ip->i_flag |= ICHG; 4225 ip->i_seq++; 4226 ufs_setreclaim(ip); 4227 rw_exit(&ip->i_contents); 4228 } 4229 4230 unlock: 4231 if (ip != NULL) 4232 VN_RELE(ITOV(ip)); 4233 4234 if (ulp) { 4235 int terr = 0; 4236 4237 TRANS_END_CSYNC(ufsvfsp, terr, issync, TOP_SYMLINK, 4238 trans_size); 4239 ufs_lockfs_end(ulp); 4240 if (error == 0) 4241 error = terr; 4242 } 4243 4244 /* 4245 * We may have failed due to lack of an inode or of a block to 4246 * store the target in. Try flushing the delete queue to free 4247 * logically-available things up and try again. 4248 */ 4249 if ((error == ENOSPC) && retry && TRANS_ISTRANS(ufsvfsp)) { 4250 ufs_delete_drain_wait(ufsvfsp, 1); 4251 retry = 0; 4252 goto again; 4253 } 4254 4255 out: 4256 return (error); 4257 } 4258 4259 /* 4260 * Ufs specific routine used to do ufs io. 4261 */ 4262 int 4263 ufs_rdwri(enum uio_rw rw, int ioflag, struct inode *ip, caddr_t base, 4264 ssize_t len, offset_t offset, enum uio_seg seg, int *aresid, 4265 struct cred *cr) 4266 { 4267 struct uio auio; 4268 struct iovec aiov; 4269 int error; 4270 4271 ASSERT(RW_LOCK_HELD(&ip->i_contents)); 4272 4273 bzero((caddr_t)&auio, sizeof (uio_t)); 4274 bzero((caddr_t)&aiov, sizeof (iovec_t)); 4275 4276 aiov.iov_base = base; 4277 aiov.iov_len = len; 4278 auio.uio_iov = &aiov; 4279 auio.uio_iovcnt = 1; 4280 auio.uio_loffset = offset; 4281 auio.uio_segflg = (short)seg; 4282 auio.uio_resid = len; 4283 4284 if (rw == UIO_WRITE) { 4285 auio.uio_fmode = FWRITE; 4286 auio.uio_extflg = UIO_COPY_DEFAULT; 4287 auio.uio_llimit = curproc->p_fsz_ctl; 4288 error = wrip(ip, &auio, ioflag, cr); 4289 } else { 4290 auio.uio_fmode = FREAD; 4291 auio.uio_extflg = UIO_COPY_CACHED; 4292 auio.uio_llimit = MAXOFFSET_T; 4293 error = rdip(ip, &auio, ioflag, cr); 4294 } 4295 4296 if (aresid) { 4297 *aresid = auio.uio_resid; 4298 } else if (auio.uio_resid) { 4299 error = EIO; 4300 } 4301 return (error); 4302 } 4303 4304 /*ARGSUSED*/ 4305 static int 4306 ufs_fid(struct vnode *vp, struct fid *fidp, caller_context_t *ct) 4307 { 4308 struct ufid *ufid; 4309 struct inode *ip = VTOI(vp); 4310 4311 if (ip->i_ufsvfs == NULL) 4312 return (EIO); 4313 4314 if (fidp->fid_len < (sizeof (struct ufid) - sizeof (ushort_t))) { 4315 fidp->fid_len = sizeof (struct ufid) - sizeof (ushort_t); 4316 return (ENOSPC); 4317 } 4318 4319 ufid = (struct ufid *)fidp; 4320 bzero((char *)ufid, sizeof (struct ufid)); 4321 ufid->ufid_len = sizeof (struct ufid) - sizeof (ushort_t); 4322 ufid->ufid_ino = ip->i_number; 4323 ufid->ufid_gen = ip->i_gen; 4324 4325 return (0); 4326 } 4327 4328 /* ARGSUSED2 */ 4329 static int 4330 ufs_rwlock(struct vnode *vp, int write_lock, caller_context_t *ctp) 4331 { 4332 struct inode *ip = VTOI(vp); 4333 struct ufsvfs *ufsvfsp; 4334 int forcedirectio; 4335 4336 /* 4337 * Read case is easy. 4338 */ 4339 if (!write_lock) { 4340 rw_enter(&ip->i_rwlock, RW_READER); 4341 return (V_WRITELOCK_FALSE); 4342 } 4343 4344 /* 4345 * Caller has requested a writer lock, but that inhibits any 4346 * concurrency in the VOPs that follow. Acquire the lock shared 4347 * and defer exclusive access until it is known to be needed in 4348 * other VOP handlers. Some cases can be determined here. 4349 */ 4350 4351 /* 4352 * If directio is not set, there is no chance of concurrency, 4353 * so just acquire the lock exclusive. Beware of a forced 4354 * unmount before looking at the mount option. 4355 */ 4356 ufsvfsp = ip->i_ufsvfs; 4357 forcedirectio = ufsvfsp ? ufsvfsp->vfs_forcedirectio : 0; 4358 if (!(ip->i_flag & IDIRECTIO || forcedirectio) || 4359 !ufs_allow_shared_writes) { 4360 rw_enter(&ip->i_rwlock, RW_WRITER); 4361 return (V_WRITELOCK_TRUE); 4362 } 4363 4364 /* 4365 * Mandatory locking forces acquiring i_rwlock exclusive. 4366 */ 4367 if (MANDLOCK(vp, ip->i_mode)) { 4368 rw_enter(&ip->i_rwlock, RW_WRITER); 4369 return (V_WRITELOCK_TRUE); 4370 } 4371 4372 /* 4373 * Acquire the lock shared in case a concurrent write follows. 4374 * Mandatory locking could have become enabled before the lock 4375 * was acquired. Re-check and upgrade if needed. 4376 */ 4377 rw_enter(&ip->i_rwlock, RW_READER); 4378 if (MANDLOCK(vp, ip->i_mode)) { 4379 rw_exit(&ip->i_rwlock); 4380 rw_enter(&ip->i_rwlock, RW_WRITER); 4381 return (V_WRITELOCK_TRUE); 4382 } 4383 return (V_WRITELOCK_FALSE); 4384 } 4385 4386 /*ARGSUSED*/ 4387 static void 4388 ufs_rwunlock(struct vnode *vp, int write_lock, caller_context_t *ctp) 4389 { 4390 struct inode *ip = VTOI(vp); 4391 4392 rw_exit(&ip->i_rwlock); 4393 } 4394 4395 /* ARGSUSED */ 4396 static int 4397 ufs_seek(struct vnode *vp, offset_t ooff, offset_t *noffp, 4398 caller_context_t *ct) 4399 { 4400 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); 4401 } 4402 4403 /* ARGSUSED */ 4404 static int 4405 ufs_frlock(struct vnode *vp, int cmd, struct flock64 *bfp, int flag, 4406 offset_t offset, struct flk_callback *flk_cbp, struct cred *cr, 4407 caller_context_t *ct) 4408 { 4409 struct inode *ip = VTOI(vp); 4410 4411 if (ip->i_ufsvfs == NULL) 4412 return (EIO); 4413 4414 /* 4415 * If file is being mapped, disallow frlock. 4416 * XXX I am not holding tlock while checking i_mapcnt because the 4417 * current locking strategy drops all locks before calling fs_frlock. 4418 * So, mapcnt could change before we enter fs_frlock making is 4419 * meaningless to have held tlock in the first place. 4420 */ 4421 if (ip->i_mapcnt > 0 && MANDLOCK(vp, ip->i_mode)) 4422 return (EAGAIN); 4423 return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct)); 4424 } 4425 4426 /* ARGSUSED */ 4427 static int 4428 ufs_space(struct vnode *vp, int cmd, struct flock64 *bfp, int flag, 4429 offset_t offset, cred_t *cr, caller_context_t *ct) 4430 { 4431 struct ufsvfs *ufsvfsp = VTOI(vp)->i_ufsvfs; 4432 struct ulockfs *ulp; 4433 int error; 4434 4435 if ((error = convoff(vp, bfp, 0, offset)) == 0) { 4436 if (cmd == F_FREESP) { 4437 error = ufs_lockfs_begin(ufsvfsp, &ulp, 4438 ULOCKFS_SPACE_MASK); 4439 if (error) 4440 return (error); 4441 error = ufs_freesp(vp, bfp, flag, cr); 4442 } else if (cmd == F_ALLOCSP) { 4443 error = ufs_lockfs_begin(ufsvfsp, &ulp, 4444 ULOCKFS_FALLOCATE_MASK); 4445 if (error) 4446 return (error); 4447 error = ufs_allocsp(vp, bfp, cr); 4448 } else 4449 return (EINVAL); /* Command not handled here */ 4450 4451 if (ulp) 4452 ufs_lockfs_end(ulp); 4453 4454 } 4455 return (error); 4456 } 4457 4458 /* 4459 * Used to determine if read ahead should be done. Also used to 4460 * to determine when write back occurs. 4461 */ 4462 #define CLUSTSZ(ip) ((ip)->i_ufsvfs->vfs_ioclustsz) 4463 4464 /* 4465 * A faster version of ufs_getpage. 4466 * 4467 * We optimize by inlining the pvn_getpages iterator, eliminating 4468 * calls to bmap_read if file doesn't have UFS holes, and avoiding 4469 * the overhead of page_exists(). 4470 * 4471 * When files has UFS_HOLES and ufs_getpage is called with S_READ, 4472 * we set *protp to PROT_READ to avoid calling bmap_read. This approach 4473 * victimizes performance when a file with UFS holes is faulted 4474 * first in the S_READ mode, and then in the S_WRITE mode. We will get 4475 * two MMU faults in this case. 4476 * 4477 * XXX - the inode fields which control the sequential mode are not 4478 * protected by any mutex. The read ahead will act wild if 4479 * multiple processes will access the file concurrently and 4480 * some of them in sequential mode. One particulary bad case 4481 * is if another thread will change the value of i_nextrio between 4482 * the time this thread tests the i_nextrio value and then reads it 4483 * again to use it as the offset for the read ahead. 4484 */ 4485 /*ARGSUSED*/ 4486 static int 4487 ufs_getpage(struct vnode *vp, offset_t off, size_t len, uint_t *protp, 4488 page_t *plarr[], size_t plsz, struct seg *seg, caddr_t addr, 4489 enum seg_rw rw, struct cred *cr, caller_context_t *ct) 4490 { 4491 u_offset_t uoff = (u_offset_t)off; /* type conversion */ 4492 u_offset_t pgoff; 4493 u_offset_t eoff; 4494 struct inode *ip = VTOI(vp); 4495 struct ufsvfs *ufsvfsp = ip->i_ufsvfs; 4496 struct fs *fs; 4497 struct ulockfs *ulp; 4498 page_t **pl; 4499 caddr_t pgaddr; 4500 krw_t rwtype; 4501 int err; 4502 int has_holes; 4503 int beyond_eof; 4504 int seqmode; 4505 int pgsize = PAGESIZE; 4506 int dolock; 4507 int do_qlock; 4508 int trans_size; 4509 4510 ASSERT((uoff & PAGEOFFSET) == 0); 4511 4512 if (protp) 4513 *protp = PROT_ALL; 4514 4515 /* 4516 * Obey the lockfs protocol 4517 */ 4518 err = ufs_lockfs_begin_getpage(ufsvfsp, &ulp, seg, 4519 rw == S_READ || rw == S_EXEC, protp); 4520 if (err) 4521 goto out; 4522 4523 fs = ufsvfsp->vfs_fs; 4524 4525 if (ulp && (rw == S_CREATE || rw == S_WRITE) && 4526 !(vp->v_flag & VISSWAP)) { 4527 /* 4528 * Try to start a transaction, will return if blocking is 4529 * expected to occur and the address space is not the 4530 * kernel address space. 4531 */ 4532 trans_size = TOP_GETPAGE_SIZE(ip); 4533 if (seg->s_as != &kas) { 4534 TRANS_TRY_BEGIN_ASYNC(ufsvfsp, TOP_GETPAGE, 4535 trans_size, err) 4536 if (err == EWOULDBLOCK) { 4537 /* 4538 * Use EDEADLK here because the VM code 4539 * can normally never see this error. 4540 */ 4541 err = EDEADLK; 4542 ufs_lockfs_end(ulp); 4543 goto out; 4544 } 4545 } else { 4546 TRANS_BEGIN_ASYNC(ufsvfsp, TOP_GETPAGE, trans_size); 4547 } 4548 } 4549 4550 if (vp->v_flag & VNOMAP) { 4551 err = ENOSYS; 4552 goto unlock; 4553 } 4554 4555 seqmode = ip->i_nextr == uoff && rw != S_CREATE; 4556 4557 rwtype = RW_READER; /* start as a reader */ 4558 dolock = (rw_owner(&ip->i_contents) != curthread); 4559 /* 4560 * If this thread owns the lock, i.e., this thread grabbed it 4561 * as writer somewhere above, then we don't need to grab the 4562 * lock as reader in this routine. 4563 */ 4564 do_qlock = (rw_owner(&ufsvfsp->vfs_dqrwlock) != curthread); 4565 4566 retrylock: 4567 if (dolock) { 4568 /* 4569 * Grab the quota lock if we need to call 4570 * bmap_write() below (with i_contents as writer). 4571 */ 4572 if (do_qlock && rwtype == RW_WRITER) 4573 rw_enter(&ufsvfsp->vfs_dqrwlock, RW_READER); 4574 rw_enter(&ip->i_contents, rwtype); 4575 } 4576 4577 /* 4578 * We may be getting called as a side effect of a bmap using 4579 * fbread() when the blocks might be being allocated and the 4580 * size has not yet been up'ed. In this case we want to be 4581 * able to return zero pages if we get back UFS_HOLE from 4582 * calling bmap for a non write case here. We also might have 4583 * to read some frags from the disk into a page if we are 4584 * extending the number of frags for a given lbn in bmap(). 4585 * Large Files: The read of i_size here is atomic because 4586 * i_contents is held here. If dolock is zero, the lock 4587 * is held in bmap routines. 4588 */ 4589 beyond_eof = uoff + len > 4590 ((ip->i_size + PAGEOFFSET) & (uintptr_t)PAGEMASK); 4591 if (beyond_eof && seg != segkmap) { 4592 if (dolock) { 4593 rw_exit(&ip->i_contents); 4594 if (do_qlock && rwtype == RW_WRITER) 4595 rw_exit(&ufsvfsp->vfs_dqrwlock); 4596 } 4597 err = EFAULT; 4598 goto unlock; 4599 } 4600 4601 /* 4602 * Must hold i_contents lock throughout the call to pvn_getpages 4603 * since locked pages are returned from each call to ufs_getapage. 4604 * Must *not* return locked pages and then try for contents lock 4605 * due to lock ordering requirements (inode > page) 4606 */ 4607 4608 has_holes = bmap_has_holes(ip); 4609 4610 if ((rw == S_WRITE || rw == S_CREATE) && has_holes && !beyond_eof) { 4611 int blk_size; 4612 u_offset_t offset; 4613 4614 /* 4615 * We must acquire the RW_WRITER lock in order to 4616 * call bmap_write(). 4617 */ 4618 if (dolock && rwtype == RW_READER) { 4619 rwtype = RW_WRITER; 4620 4621 /* 4622 * Grab the quota lock before 4623 * upgrading i_contents, but if we can't grab it 4624 * don't wait here due to lock order: 4625 * vfs_dqrwlock > i_contents. 4626 */ 4627 if (do_qlock && 4628 rw_tryenter(&ufsvfsp->vfs_dqrwlock, RW_READER) 4629 == 0) { 4630 rw_exit(&ip->i_contents); 4631 goto retrylock; 4632 } 4633 if (!rw_tryupgrade(&ip->i_contents)) { 4634 rw_exit(&ip->i_contents); 4635 if (do_qlock) 4636 rw_exit(&ufsvfsp->vfs_dqrwlock); 4637 goto retrylock; 4638 } 4639 } 4640 4641 /* 4642 * May be allocating disk blocks for holes here as 4643 * a result of mmap faults. write(2) does the bmap_write 4644 * in rdip/wrip, not here. We are not dealing with frags 4645 * in this case. 4646 */ 4647 /* 4648 * Large Files: We cast fs_bmask field to offset_t 4649 * just as we do for MAXBMASK because uoff is a 64-bit 4650 * data type. fs_bmask will still be a 32-bit type 4651 * as we cannot change any ondisk data structures. 4652 */ 4653 4654 offset = uoff & (offset_t)fs->fs_bmask; 4655 while (offset < uoff + len) { 4656 blk_size = (int)blksize(fs, ip, lblkno(fs, offset)); 4657 err = bmap_write(ip, offset, blk_size, 4658 BI_NORMAL, NULL, cr); 4659 if (ip->i_flag & (ICHG|IUPD)) 4660 ip->i_seq++; 4661 if (err) 4662 goto update_inode; 4663 offset += blk_size; /* XXX - make this contig */ 4664 } 4665 } 4666 4667 /* 4668 * Can be a reader from now on. 4669 */ 4670 if (dolock && rwtype == RW_WRITER) { 4671 rw_downgrade(&ip->i_contents); 4672 /* 4673 * We can release vfs_dqrwlock early so do it, but make 4674 * sure we don't try to release it again at the bottom. 4675 */ 4676 if (do_qlock) { 4677 rw_exit(&ufsvfsp->vfs_dqrwlock); 4678 do_qlock = 0; 4679 } 4680 } 4681 4682 /* 4683 * We remove PROT_WRITE in cases when the file has UFS holes 4684 * because we don't want to call bmap_read() to check each 4685 * page if it is backed with a disk block. 4686 */ 4687 if (protp && has_holes && rw != S_WRITE && rw != S_CREATE) 4688 *protp &= ~PROT_WRITE; 4689 4690 err = 0; 4691 4692 /* 4693 * The loop looks up pages in the range [off, off + len). 4694 * For each page, we first check if we should initiate an asynchronous 4695 * read ahead before we call page_lookup (we may sleep in page_lookup 4696 * for a previously initiated disk read). 4697 */ 4698 eoff = (uoff + len); 4699 for (pgoff = uoff, pgaddr = addr, pl = plarr; 4700 pgoff < eoff; /* empty */) { 4701 page_t *pp; 4702 u_offset_t nextrio; 4703 se_t se; 4704 int retval; 4705 4706 se = ((rw == S_CREATE || rw == S_OTHER) ? SE_EXCL : SE_SHARED); 4707 4708 /* Handle async getpage (faultahead) */ 4709 if (plarr == NULL) { 4710 ip->i_nextrio = pgoff; 4711 (void) ufs_getpage_ra(vp, pgoff, seg, pgaddr); 4712 pgoff += pgsize; 4713 pgaddr += pgsize; 4714 continue; 4715 } 4716 /* 4717 * Check if we should initiate read ahead of next cluster. 4718 * We call page_exists only when we need to confirm that 4719 * we have the current page before we initiate the read ahead. 4720 */ 4721 nextrio = ip->i_nextrio; 4722 if (seqmode && 4723 pgoff + CLUSTSZ(ip) >= nextrio && pgoff <= nextrio && 4724 nextrio < ip->i_size && page_exists(vp, pgoff)) { 4725 retval = ufs_getpage_ra(vp, pgoff, seg, pgaddr); 4726 /* 4727 * We always read ahead the next cluster of data 4728 * starting from i_nextrio. If the page (vp,nextrio) 4729 * is actually in core at this point, the routine 4730 * ufs_getpage_ra() will stop pre-fetching data 4731 * until we read that page in a synchronized manner 4732 * through ufs_getpage_miss(). So, we should increase 4733 * i_nextrio if the page (vp, nextrio) exists. 4734 */ 4735 if ((retval == 0) && page_exists(vp, nextrio)) { 4736 ip->i_nextrio = nextrio + pgsize; 4737 } 4738 } 4739 4740 if ((pp = page_lookup(vp, pgoff, se)) != NULL) { 4741 /* 4742 * We found the page in the page cache. 4743 */ 4744 *pl++ = pp; 4745 pgoff += pgsize; 4746 pgaddr += pgsize; 4747 len -= pgsize; 4748 plsz -= pgsize; 4749 } else { 4750 /* 4751 * We have to create the page, or read it from disk. 4752 */ 4753 if (err = ufs_getpage_miss(vp, pgoff, len, seg, pgaddr, 4754 pl, plsz, rw, seqmode)) 4755 goto error; 4756 4757 while (*pl != NULL) { 4758 pl++; 4759 pgoff += pgsize; 4760 pgaddr += pgsize; 4761 len -= pgsize; 4762 plsz -= pgsize; 4763 } 4764 } 4765 } 4766 4767 /* 4768 * Return pages up to plsz if they are in the page cache. 4769 * We cannot return pages if there is a chance that they are 4770 * backed with a UFS hole and rw is S_WRITE or S_CREATE. 4771 */ 4772 if (plarr && !(has_holes && (rw == S_WRITE || rw == S_CREATE))) { 4773 4774 ASSERT((protp == NULL) || 4775 !(has_holes && (*protp & PROT_WRITE))); 4776 4777 eoff = pgoff + plsz; 4778 while (pgoff < eoff) { 4779 page_t *pp; 4780 4781 if ((pp = page_lookup_nowait(vp, pgoff, 4782 SE_SHARED)) == NULL) 4783 break; 4784 4785 *pl++ = pp; 4786 pgoff += pgsize; 4787 plsz -= pgsize; 4788 } 4789 } 4790 4791 if (plarr) 4792 *pl = NULL; /* Terminate page list */ 4793 ip->i_nextr = pgoff; 4794 4795 error: 4796 if (err && plarr) { 4797 /* 4798 * Release any pages we have locked. 4799 */ 4800 while (pl > &plarr[0]) 4801 page_unlock(*--pl); 4802 4803 plarr[0] = NULL; 4804 } 4805 4806 update_inode: 4807 /* 4808 * If the inode is not already marked for IACC (in rdip() for read) 4809 * and the inode is not marked for no access time update (in wrip() 4810 * for write) then update the inode access time and mod time now. 4811 */ 4812 if ((ip->i_flag & (IACC | INOACC)) == 0) { 4813 if ((rw != S_OTHER) && (ip->i_mode & IFMT) != IFDIR) { 4814 if (!ULOCKFS_IS_NOIACC(ITOUL(ip)) && 4815 (fs->fs_ronly == 0) && 4816 (!ufsvfsp->vfs_noatime)) { 4817 mutex_enter(&ip->i_tlock); 4818 ip->i_flag |= IACC; 4819 ITIMES_NOLOCK(ip); 4820 mutex_exit(&ip->i_tlock); 4821 } 4822 } 4823 } 4824 4825 if (dolock) { 4826 rw_exit(&ip->i_contents); 4827 if (do_qlock && rwtype == RW_WRITER) 4828 rw_exit(&ufsvfsp->vfs_dqrwlock); 4829 } 4830 4831 unlock: 4832 if (ulp) { 4833 if ((rw == S_CREATE || rw == S_WRITE) && 4834 !(vp->v_flag & VISSWAP)) { 4835 TRANS_END_ASYNC(ufsvfsp, TOP_GETPAGE, trans_size); 4836 } 4837 ufs_lockfs_end(ulp); 4838 } 4839 out: 4840 return (err); 4841 } 4842 4843 /* 4844 * ufs_getpage_miss is called when ufs_getpage missed the page in the page 4845 * cache. The page is either read from the disk, or it's created. 4846 * A page is created (without disk read) if rw == S_CREATE, or if 4847 * the page is not backed with a real disk block (UFS hole). 4848 */ 4849 /* ARGSUSED */ 4850 static int 4851 ufs_getpage_miss(struct vnode *vp, u_offset_t off, size_t len, struct seg *seg, 4852 caddr_t addr, page_t *pl[], size_t plsz, enum seg_rw rw, int seq) 4853 { 4854 struct inode *ip = VTOI(vp); 4855 page_t *pp; 4856 daddr_t bn; 4857 size_t io_len; 4858 int crpage = 0; 4859 int err; 4860 int contig; 4861 int bsize = ip->i_fs->fs_bsize; 4862 4863 /* 4864 * Figure out whether the page can be created, or must be 4865 * must be read from the disk. 4866 */ 4867 if (rw == S_CREATE) 4868 crpage = 1; 4869 else { 4870 contig = 0; 4871 if (err = bmap_read(ip, off, &bn, &contig)) 4872 return (err); 4873 4874 crpage = (bn == UFS_HOLE); 4875 4876 /* 4877 * If its also a fallocated block that hasn't been written to 4878 * yet, we will treat it just like a UFS_HOLE and create 4879 * a zero page for it 4880 */ 4881 if (ISFALLOCBLK(ip, bn)) 4882 crpage = 1; 4883 } 4884 4885 if (crpage) { 4886 if ((pp = page_create_va(vp, off, PAGESIZE, PG_WAIT, seg, 4887 addr)) == NULL) { 4888 return (ufs_fault(vp, 4889 "ufs_getpage_miss: page_create == NULL")); 4890 } 4891 4892 if (rw != S_CREATE) 4893 pagezero(pp, 0, PAGESIZE); 4894 4895 io_len = PAGESIZE; 4896 } else { 4897 u_offset_t io_off; 4898 uint_t xlen; 4899 struct buf *bp; 4900 ufsvfs_t *ufsvfsp = ip->i_ufsvfs; 4901 4902 /* 4903 * If access is not in sequential order, we read from disk 4904 * in bsize units. 4905 * 4906 * We limit the size of the transfer to bsize if we are reading 4907 * from the beginning of the file. Note in this situation we 4908 * will hedge our bets and initiate an async read ahead of 4909 * the second block. 4910 */ 4911 if (!seq || off == 0) 4912 contig = MIN(contig, bsize); 4913 4914 pp = pvn_read_kluster(vp, off, seg, addr, &io_off, 4915 &io_len, off, contig, 0); 4916 4917 /* 4918 * Some other thread has entered the page. 4919 * ufs_getpage will retry page_lookup. 4920 */ 4921 if (pp == NULL) { 4922 pl[0] = NULL; 4923 return (0); 4924 } 4925 4926 /* 4927 * Zero part of the page which we are not 4928 * going to read from the disk. 4929 */ 4930 xlen = io_len & PAGEOFFSET; 4931 if (xlen != 0) 4932 pagezero(pp->p_prev, xlen, PAGESIZE - xlen); 4933 4934 bp = pageio_setup(pp, io_len, ip->i_devvp, B_READ); 4935 bp->b_edev = ip->i_dev; 4936 bp->b_dev = cmpdev(ip->i_dev); 4937 bp->b_blkno = bn; 4938 bp->b_un.b_addr = (caddr_t)0; 4939 bp->b_file = ip->i_vnode; 4940 bp->b_offset = off; 4941 4942 if (ufsvfsp->vfs_log) { 4943 lufs_read_strategy(ufsvfsp->vfs_log, bp); 4944 } else if (ufsvfsp->vfs_snapshot) { 4945 fssnap_strategy(&ufsvfsp->vfs_snapshot, bp); 4946 } else { 4947 ufsvfsp->vfs_iotstamp = lbolt; 4948 ub.ub_getpages.value.ul++; 4949 (void) bdev_strategy(bp); 4950 lwp_stat_update(LWP_STAT_INBLK, 1); 4951 } 4952 4953 ip->i_nextrio = off + ((io_len + PAGESIZE - 1) & PAGEMASK); 4954 4955 /* 4956 * If the file access is sequential, initiate read ahead 4957 * of the next cluster. 4958 */ 4959 if (seq && ip->i_nextrio < ip->i_size) 4960 (void) ufs_getpage_ra(vp, off, seg, addr); 4961 err = biowait(bp); 4962 pageio_done(bp); 4963 4964 if (err) { 4965 pvn_read_done(pp, B_ERROR); 4966 return (err); 4967 } 4968 } 4969 4970 pvn_plist_init(pp, pl, plsz, off, io_len, rw); 4971 return (0); 4972 } 4973 4974 /* 4975 * Read ahead a cluster from the disk. Returns the length in bytes. 4976 */ 4977 static int 4978 ufs_getpage_ra(struct vnode *vp, u_offset_t off, struct seg *seg, caddr_t addr) 4979 { 4980 struct inode *ip = VTOI(vp); 4981 page_t *pp; 4982 u_offset_t io_off = ip->i_nextrio; 4983 ufsvfs_t *ufsvfsp; 4984 caddr_t addr2 = addr + (io_off - off); 4985 struct buf *bp; 4986 daddr_t bn; 4987 size_t io_len; 4988 int err; 4989 int contig; 4990 int xlen; 4991 int bsize = ip->i_fs->fs_bsize; 4992 4993 /* 4994 * If the directio advisory is in effect on this file, 4995 * then do not do buffered read ahead. Read ahead makes 4996 * it more difficult on threads using directio as they 4997 * will be forced to flush the pages from this vnode. 4998 */ 4999 if ((ufsvfsp = ip->i_ufsvfs) == NULL) 5000 return (0); 5001 if (ip->i_flag & IDIRECTIO || ufsvfsp->vfs_forcedirectio) 5002 return (0); 5003 5004 /* 5005 * Is this test needed? 5006 */ 5007 if (addr2 >= seg->s_base + seg->s_size) 5008 return (0); 5009 5010 contig = 0; 5011 err = bmap_read(ip, io_off, &bn, &contig); 5012 /* 5013 * If its a UFS_HOLE or a fallocated block, do not perform 5014 * any read ahead's since there probably is nothing to read ahead 5015 */ 5016 if (err || bn == UFS_HOLE || ISFALLOCBLK(ip, bn)) 5017 return (0); 5018 5019 /* 5020 * Limit the transfer size to bsize if this is the 2nd block. 5021 */ 5022 if (io_off == (u_offset_t)bsize) 5023 contig = MIN(contig, bsize); 5024 5025 if ((pp = pvn_read_kluster(vp, io_off, seg, addr2, &io_off, 5026 &io_len, io_off, contig, 1)) == NULL) 5027 return (0); 5028 5029 /* 5030 * Zero part of page which we are not going to read from disk 5031 */ 5032 if ((xlen = (io_len & PAGEOFFSET)) > 0) 5033 pagezero(pp->p_prev, xlen, PAGESIZE - xlen); 5034 5035 ip->i_nextrio = (io_off + io_len + PAGESIZE - 1) & PAGEMASK; 5036 5037 bp = pageio_setup(pp, io_len, ip->i_devvp, B_READ | B_ASYNC); 5038 bp->b_edev = ip->i_dev; 5039 bp->b_dev = cmpdev(ip->i_dev); 5040 bp->b_blkno = bn; 5041 bp->b_un.b_addr = (caddr_t)0; 5042 bp->b_file = ip->i_vnode; 5043 bp->b_offset = off; 5044 5045 if (ufsvfsp->vfs_log) { 5046 lufs_read_strategy(ufsvfsp->vfs_log, bp); 5047 } else if (ufsvfsp->vfs_snapshot) { 5048 fssnap_strategy(&ufsvfsp->vfs_snapshot, bp); 5049 } else { 5050 ufsvfsp->vfs_iotstamp = lbolt; 5051 ub.ub_getras.value.ul++; 5052 (void) bdev_strategy(bp); 5053 lwp_stat_update(LWP_STAT_INBLK, 1); 5054 } 5055 5056 return (io_len); 5057 } 5058 5059 int ufs_delay = 1; 5060 /* 5061 * Flags are composed of {B_INVAL, B_FREE, B_DONTNEED, B_FORCE, B_ASYNC} 5062 * 5063 * LMXXX - the inode really ought to contain a pointer to one of these 5064 * async args. Stuff gunk in there and just hand the whole mess off. 5065 * This would replace i_delaylen, i_delayoff. 5066 */ 5067 /*ARGSUSED*/ 5068 static int 5069 ufs_putpage(struct vnode *vp, offset_t off, size_t len, int flags, 5070 struct cred *cr, caller_context_t *ct) 5071 { 5072 struct inode *ip = VTOI(vp); 5073 int err = 0; 5074 5075 if (vp->v_count == 0) { 5076 return (ufs_fault(vp, "ufs_putpage: bad v_count == 0")); 5077 } 5078 5079 /* 5080 * XXX - Why should this check be made here? 5081 */ 5082 if (vp->v_flag & VNOMAP) { 5083 err = ENOSYS; 5084 goto errout; 5085 } 5086 5087 if (ip->i_ufsvfs == NULL) { 5088 err = EIO; 5089 goto errout; 5090 } 5091 5092 if (flags & B_ASYNC) { 5093 if (ufs_delay && len && 5094 (flags & ~(B_ASYNC|B_DONTNEED|B_FREE)) == 0) { 5095 mutex_enter(&ip->i_tlock); 5096 /* 5097 * If nobody stalled, start a new cluster. 5098 */ 5099 if (ip->i_delaylen == 0) { 5100 ip->i_delayoff = off; 5101 ip->i_delaylen = len; 5102 mutex_exit(&ip->i_tlock); 5103 goto errout; 5104 } 5105 /* 5106 * If we have a full cluster or they are not contig, 5107 * then push last cluster and start over. 5108 */ 5109 if (ip->i_delaylen >= CLUSTSZ(ip) || 5110 ip->i_delayoff + ip->i_delaylen != off) { 5111 u_offset_t doff; 5112 size_t dlen; 5113 5114 doff = ip->i_delayoff; 5115 dlen = ip->i_delaylen; 5116 ip->i_delayoff = off; 5117 ip->i_delaylen = len; 5118 mutex_exit(&ip->i_tlock); 5119 err = ufs_putpages(vp, doff, dlen, 5120 flags, cr); 5121 /* LMXXX - flags are new val, not old */ 5122 goto errout; 5123 } 5124 /* 5125 * There is something there, it's not full, and 5126 * it is contig. 5127 */ 5128 ip->i_delaylen += len; 5129 mutex_exit(&ip->i_tlock); 5130 goto errout; 5131 } 5132 /* 5133 * Must have weird flags or we are not clustering. 5134 */ 5135 } 5136 5137 err = ufs_putpages(vp, off, len, flags, cr); 5138 5139 errout: 5140 return (err); 5141 } 5142 5143 /* 5144 * If len == 0, do from off to EOF. 5145 * 5146 * The normal cases should be len == 0 & off == 0 (entire vp list), 5147 * len == MAXBSIZE (from segmap_release actions), and len == PAGESIZE 5148 * (from pageout). 5149 */ 5150 /*ARGSUSED*/ 5151 static int 5152 ufs_putpages( 5153 struct vnode *vp, 5154 offset_t off, 5155 size_t len, 5156 int flags, 5157 struct cred *cr) 5158 { 5159 u_offset_t io_off; 5160 u_offset_t eoff; 5161 struct inode *ip = VTOI(vp); 5162 page_t *pp; 5163 size_t io_len; 5164 int err = 0; 5165 int dolock; 5166 5167 if (vp->v_count == 0) 5168 return (ufs_fault(vp, "ufs_putpages: v_count == 0")); 5169 /* 5170 * Acquire the readers/write inode lock before locking 5171 * any pages in this inode. 5172 * The inode lock is held during i/o. 5173 */ 5174 if (len == 0) { 5175 mutex_enter(&ip->i_tlock); 5176 ip->i_delayoff = ip->i_delaylen = 0; 5177 mutex_exit(&ip->i_tlock); 5178 } 5179 dolock = (rw_owner(&ip->i_contents) != curthread); 5180 if (dolock) { 5181 /* 5182 * Must synchronize this thread and any possible thread 5183 * operating in the window of vulnerability in wrip(). 5184 * It is dangerous to allow both a thread doing a putpage 5185 * and a thread writing, so serialize them. The exception 5186 * is when the thread in wrip() does something which causes 5187 * a putpage operation. Then, the thread must be allowed 5188 * to continue. It may encounter a bmap_read problem in 5189 * ufs_putapage, but that is handled in ufs_putapage. 5190 * Allow async writers to proceed, we don't want to block 5191 * the pageout daemon. 5192 */ 5193 if (ip->i_writer == curthread) 5194 rw_enter(&ip->i_contents, RW_READER); 5195 else { 5196 for (;;) { 5197 rw_enter(&ip->i_contents, RW_READER); 5198 mutex_enter(&ip->i_tlock); 5199 /* 5200 * If there is no thread in the critical 5201 * section of wrip(), then proceed. 5202 * Otherwise, wait until there isn't one. 5203 */ 5204 if (ip->i_writer == NULL) { 5205 mutex_exit(&ip->i_tlock); 5206 break; 5207 } 5208 rw_exit(&ip->i_contents); 5209 /* 5210 * Bounce async writers when we have a writer 5211 * working on this file so we don't deadlock 5212 * the pageout daemon. 5213 */ 5214 if (flags & B_ASYNC) { 5215 mutex_exit(&ip->i_tlock); 5216 return (0); 5217 } 5218 cv_wait(&ip->i_wrcv, &ip->i_tlock); 5219 mutex_exit(&ip->i_tlock); 5220 } 5221 } 5222 } 5223 5224 if (!vn_has_cached_data(vp)) { 5225 if (dolock) 5226 rw_exit(&ip->i_contents); 5227 return (0); 5228 } 5229 5230 if (len == 0) { 5231 /* 5232 * Search the entire vp list for pages >= off. 5233 */ 5234 err = pvn_vplist_dirty(vp, (u_offset_t)off, ufs_putapage, 5235 flags, cr); 5236 } else { 5237 /* 5238 * Loop over all offsets in the range looking for 5239 * pages to deal with. 5240 */ 5241 if ((eoff = blkroundup(ip->i_fs, ip->i_size)) != 0) 5242 eoff = MIN(off + len, eoff); 5243 else 5244 eoff = off + len; 5245 5246 for (io_off = off; io_off < eoff; io_off += io_len) { 5247 /* 5248 * If we are not invalidating, synchronously 5249 * freeing or writing pages, use the routine 5250 * page_lookup_nowait() to prevent reclaiming 5251 * them from the free list. 5252 */ 5253 if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) { 5254 pp = page_lookup(vp, io_off, 5255 (flags & (B_INVAL | B_FREE)) ? 5256 SE_EXCL : SE_SHARED); 5257 } else { 5258 pp = page_lookup_nowait(vp, io_off, 5259 (flags & B_FREE) ? SE_EXCL : SE_SHARED); 5260 } 5261 5262 if (pp == NULL || pvn_getdirty(pp, flags) == 0) 5263 io_len = PAGESIZE; 5264 else { 5265 u_offset_t *io_offp = &io_off; 5266 5267 err = ufs_putapage(vp, pp, io_offp, &io_len, 5268 flags, cr); 5269 if (err != 0) 5270 break; 5271 /* 5272 * "io_off" and "io_len" are returned as 5273 * the range of pages we actually wrote. 5274 * This allows us to skip ahead more quickly 5275 * since several pages may've been dealt 5276 * with by this iteration of the loop. 5277 */ 5278 } 5279 } 5280 } 5281 if (err == 0 && off == 0 && (len == 0 || len >= ip->i_size)) { 5282 /* 5283 * We have just sync'ed back all the pages on 5284 * the inode, turn off the IMODTIME flag. 5285 */ 5286 mutex_enter(&ip->i_tlock); 5287 ip->i_flag &= ~IMODTIME; 5288 mutex_exit(&ip->i_tlock); 5289 } 5290 if (dolock) 5291 rw_exit(&ip->i_contents); 5292 return (err); 5293 } 5294 5295 static void 5296 ufs_iodone(buf_t *bp) 5297 { 5298 struct inode *ip; 5299 5300 ASSERT((bp->b_pages->p_vnode != NULL) && !(bp->b_flags & B_READ)); 5301 5302 bp->b_iodone = NULL; 5303 5304 ip = VTOI(bp->b_pages->p_vnode); 5305 5306 mutex_enter(&ip->i_tlock); 5307 if (ip->i_writes >= ufs_LW) { 5308 if ((ip->i_writes -= bp->b_bcount) <= ufs_LW) 5309 if (ufs_WRITES) 5310 cv_broadcast(&ip->i_wrcv); /* wake all up */ 5311 } else { 5312 ip->i_writes -= bp->b_bcount; 5313 } 5314 5315 mutex_exit(&ip->i_tlock); 5316 iodone(bp); 5317 } 5318 5319 /* 5320 * Write out a single page, possibly klustering adjacent 5321 * dirty pages. The inode lock must be held. 5322 * 5323 * LMXXX - bsize < pagesize not done. 5324 */ 5325 /*ARGSUSED*/ 5326 int 5327 ufs_putapage( 5328 struct vnode *vp, 5329 page_t *pp, 5330 u_offset_t *offp, 5331 size_t *lenp, /* return values */ 5332 int flags, 5333 struct cred *cr) 5334 { 5335 u_offset_t io_off; 5336 u_offset_t off; 5337 struct inode *ip = VTOI(vp); 5338 struct ufsvfs *ufsvfsp = ip->i_ufsvfs; 5339 struct fs *fs; 5340 struct buf *bp; 5341 size_t io_len; 5342 daddr_t bn; 5343 int err; 5344 int contig; 5345 int dotrans; 5346 5347 ASSERT(RW_LOCK_HELD(&ip->i_contents)); 5348 5349 if (ufsvfsp == NULL) { 5350 err = EIO; 5351 goto out_trace; 5352 } 5353 5354 fs = ip->i_fs; 5355 ASSERT(fs->fs_ronly == 0); 5356 5357 /* 5358 * If the modified time on the inode has not already been 5359 * set elsewhere (e.g. for write/setattr) we set the time now. 5360 * This gives us approximate modified times for mmap'ed files 5361 * which are modified via stores in the user address space. 5362 */ 5363 if ((ip->i_flag & IMODTIME) == 0) { 5364 mutex_enter(&ip->i_tlock); 5365 ip->i_flag |= IUPD; 5366 ip->i_seq++; 5367 ITIMES_NOLOCK(ip); 5368 mutex_exit(&ip->i_tlock); 5369 } 5370 5371 /* 5372 * Align the request to a block boundry (for old file systems), 5373 * and go ask bmap() how contiguous things are for this file. 5374 */ 5375 off = pp->p_offset & (offset_t)fs->fs_bmask; /* block align it */ 5376 contig = 0; 5377 err = bmap_read(ip, off, &bn, &contig); 5378 if (err) 5379 goto out; 5380 if (bn == UFS_HOLE) { /* putpage never allocates */ 5381 /* 5382 * logging device is in error mode; simply return EIO 5383 */ 5384 if (TRANS_ISERROR(ufsvfsp)) { 5385 err = EIO; 5386 goto out; 5387 } 5388 /* 5389 * Oops, the thread in the window in wrip() did some 5390 * sort of operation which caused a putpage in the bad 5391 * range. In this case, just return an error which will 5392 * cause the software modified bit on the page to set 5393 * and the page will get written out again later. 5394 */ 5395 if (ip->i_writer == curthread) { 5396 err = EIO; 5397 goto out; 5398 } 5399 /* 5400 * If the pager is trying to push a page in the bad range 5401 * just tell him to try again later when things are better. 5402 */ 5403 if (flags & B_ASYNC) { 5404 err = EAGAIN; 5405 goto out; 5406 } 5407 err = ufs_fault(ITOV(ip), "ufs_putapage: bn == UFS_HOLE"); 5408 goto out; 5409 } 5410 5411 /* 5412 * If it is an fallocate'd block, reverse the negativity since 5413 * we are now writing to it 5414 */ 5415 if (ISFALLOCBLK(ip, bn)) { 5416 err = bmap_set_bn(vp, off, dbtofsb(fs, -bn)); 5417 if (err) 5418 goto out; 5419 5420 bn = -bn; 5421 } 5422 5423 /* 5424 * Take the length (of contiguous bytes) passed back from bmap() 5425 * and _try_ and get a set of pages covering that extent. 5426 */ 5427 pp = pvn_write_kluster(vp, pp, &io_off, &io_len, off, contig, flags); 5428 5429 /* 5430 * May have run out of memory and not clustered backwards. 5431 * off p_offset 5432 * [ pp - 1 ][ pp ] 5433 * [ block ] 5434 * We told bmap off, so we have to adjust the bn accordingly. 5435 */ 5436 if (io_off > off) { 5437 bn += btod(io_off - off); 5438 contig -= (io_off - off); 5439 } 5440 5441 /* 5442 * bmap was carefull to tell us the right size so use that. 5443 * There might be unallocated frags at the end. 5444 * LMXXX - bzero the end of the page? We must be writing after EOF. 5445 */ 5446 if (io_len > contig) { 5447 ASSERT(io_len - contig < fs->fs_bsize); 5448 io_len -= (io_len - contig); 5449 } 5450 5451 /* 5452 * Handle the case where we are writing the last page after EOF. 5453 * 5454 * XXX - just a patch for i-mt3. 5455 */ 5456 if (io_len == 0) { 5457 ASSERT(pp->p_offset >= 5458 (u_offset_t)(roundup(ip->i_size, PAGESIZE))); 5459 io_len = PAGESIZE; 5460 } 5461 5462 bp = pageio_setup(pp, io_len, ip->i_devvp, B_WRITE | flags); 5463 5464 ULOCKFS_SET_MOD(ITOUL(ip)); 5465 5466 bp->b_edev = ip->i_dev; 5467 bp->b_dev = cmpdev(ip->i_dev); 5468 bp->b_blkno = bn; 5469 bp->b_un.b_addr = (caddr_t)0; 5470 bp->b_file = ip->i_vnode; 5471 5472 /* 5473 * File contents of shadow or quota inodes are metadata, and updates 5474 * to these need to be put into a logging transaction. All direct 5475 * callers in UFS do that, but fsflush can come here _before_ the 5476 * normal codepath. An example would be updating ACL information, for 5477 * which the normal codepath would be: 5478 * ufs_si_store() 5479 * ufs_rdwri() 5480 * wrip() 5481 * segmap_release() 5482 * VOP_PUTPAGE() 5483 * Here, fsflush can pick up the dirty page before segmap_release() 5484 * forces it out. If that happens, there's no transaction. 5485 * We therefore need to test whether a transaction exists, and if not 5486 * create one - for fsflush. 5487 */ 5488 dotrans = 5489 (((ip->i_mode & IFMT) == IFSHAD || ufsvfsp->vfs_qinod == ip) && 5490 ((curthread->t_flag & T_DONTBLOCK) == 0) && 5491 (TRANS_ISTRANS(ufsvfsp))); 5492 5493 if (dotrans) { 5494 curthread->t_flag |= T_DONTBLOCK; 5495 TRANS_BEGIN_ASYNC(ufsvfsp, TOP_PUTPAGE, TOP_PUTPAGE_SIZE(ip)); 5496 } 5497 if (TRANS_ISTRANS(ufsvfsp)) { 5498 if ((ip->i_mode & IFMT) == IFSHAD) { 5499 TRANS_BUF(ufsvfsp, 0, io_len, bp, DT_SHAD); 5500 } else if (ufsvfsp->vfs_qinod == ip) { 5501 TRANS_DELTA(ufsvfsp, ldbtob(bn), bp->b_bcount, DT_QR, 5502 0, 0); 5503 } 5504 } 5505 if (dotrans) { 5506 TRANS_END_ASYNC(ufsvfsp, TOP_PUTPAGE, TOP_PUTPAGE_SIZE(ip)); 5507 curthread->t_flag &= ~T_DONTBLOCK; 5508 } 5509 5510 /* write throttle */ 5511 5512 ASSERT(bp->b_iodone == NULL); 5513 bp->b_iodone = (int (*)())ufs_iodone; 5514 mutex_enter(&ip->i_tlock); 5515 ip->i_writes += bp->b_bcount; 5516 mutex_exit(&ip->i_tlock); 5517 5518 if (bp->b_flags & B_ASYNC) { 5519 if (ufsvfsp->vfs_log) { 5520 lufs_write_strategy(ufsvfsp->vfs_log, bp); 5521 } else if (ufsvfsp->vfs_snapshot) { 5522 fssnap_strategy(&ufsvfsp->vfs_snapshot, bp); 5523 } else { 5524 ufsvfsp->vfs_iotstamp = lbolt; 5525 ub.ub_putasyncs.value.ul++; 5526 (void) bdev_strategy(bp); 5527 lwp_stat_update(LWP_STAT_OUBLK, 1); 5528 } 5529 } else { 5530 if (ufsvfsp->vfs_log) { 5531 lufs_write_strategy(ufsvfsp->vfs_log, bp); 5532 } else if (ufsvfsp->vfs_snapshot) { 5533 fssnap_strategy(&ufsvfsp->vfs_snapshot, bp); 5534 } else { 5535 ufsvfsp->vfs_iotstamp = lbolt; 5536 ub.ub_putsyncs.value.ul++; 5537 (void) bdev_strategy(bp); 5538 lwp_stat_update(LWP_STAT_OUBLK, 1); 5539 } 5540 err = biowait(bp); 5541 pageio_done(bp); 5542 pvn_write_done(pp, ((err) ? B_ERROR : 0) | B_WRITE | flags); 5543 } 5544 5545 pp = NULL; 5546 5547 out: 5548 if (err != 0 && pp != NULL) 5549 pvn_write_done(pp, B_ERROR | B_WRITE | flags); 5550 5551 if (offp) 5552 *offp = io_off; 5553 if (lenp) 5554 *lenp = io_len; 5555 out_trace: 5556 return (err); 5557 } 5558 5559 uint64_t ufs_map_alock_retry_cnt; 5560 uint64_t ufs_map_lockfs_retry_cnt; 5561 5562 /* ARGSUSED */ 5563 static int 5564 ufs_map(struct vnode *vp, 5565 offset_t off, 5566 struct as *as, 5567 caddr_t *addrp, 5568 size_t len, 5569 uchar_t prot, 5570 uchar_t maxprot, 5571 uint_t flags, 5572 struct cred *cr, 5573 caller_context_t *ct) 5574 { 5575 struct segvn_crargs vn_a; 5576 struct ufsvfs *ufsvfsp = VTOI(vp)->i_ufsvfs; 5577 struct ulockfs *ulp; 5578 int error, sig; 5579 k_sigset_t smask; 5580 caddr_t hint = *addrp; 5581 5582 if (vp->v_flag & VNOMAP) { 5583 error = ENOSYS; 5584 goto out; 5585 } 5586 5587 if (off < (offset_t)0 || (offset_t)(off + len) < (offset_t)0) { 5588 error = ENXIO; 5589 goto out; 5590 } 5591 5592 if (vp->v_type != VREG) { 5593 error = ENODEV; 5594 goto out; 5595 } 5596 5597 retry_map: 5598 *addrp = hint; 5599 /* 5600 * If file is being locked, disallow mapping. 5601 */ 5602 if (vn_has_mandatory_locks(vp, VTOI(vp)->i_mode)) { 5603 error = EAGAIN; 5604 goto out; 5605 } 5606 5607 as_rangelock(as); 5608 /* 5609 * Note that if we are retrying (because ufs_lockfs_trybegin failed in 5610 * the previous attempt), some other thread could have grabbed 5611 * the same VA range if MAP_FIXED is set. In that case, choose_addr 5612 * would unmap the valid VA range, that is ok. 5613 */ 5614 error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags); 5615 if (error != 0) { 5616 as_rangeunlock(as); 5617 goto out; 5618 } 5619 5620 /* 5621 * a_lock has to be acquired before entering the lockfs protocol 5622 * because that is the order in which pagefault works. Also we cannot 5623 * block on a_lock here because this waiting writer will prevent 5624 * further readers like ufs_read from progressing and could cause 5625 * deadlock between ufs_read/ufs_map/pagefault when a quiesce is 5626 * pending. 5627 */ 5628 while (!AS_LOCK_TRYENTER(as, &as->a_lock, RW_WRITER)) { 5629 ufs_map_alock_retry_cnt++; 5630 delay(RETRY_LOCK_DELAY); 5631 } 5632 5633 /* 5634 * We can't hold as->a_lock and wait for lockfs to succeed because 5635 * the proc tools might hang on a_lock, so call ufs_lockfs_trybegin() 5636 * instead. 5637 */ 5638 if (error = ufs_lockfs_trybegin(ufsvfsp, &ulp, ULOCKFS_MAP_MASK)) { 5639 /* 5640 * ufs_lockfs_trybegin() did not succeed. It is safer to give up 5641 * as->a_lock and wait for ulp->ul_fs_lock status to change. 5642 */ 5643 ufs_map_lockfs_retry_cnt++; 5644 AS_LOCK_EXIT(as, &as->a_lock); 5645 as_rangeunlock(as); 5646 if (error == EIO) 5647 goto out; 5648 5649 mutex_enter(&ulp->ul_lock); 5650 while (ulp->ul_fs_lock & ULOCKFS_MAP_MASK) { 5651 if (ULOCKFS_IS_SLOCK(ulp) || ufsvfsp->vfs_nointr) { 5652 cv_wait(&ulp->ul_cv, &ulp->ul_lock); 5653 } else { 5654 sigintr(&smask, 1); 5655 sig = cv_wait_sig(&ulp->ul_cv, &ulp->ul_lock); 5656 sigunintr(&smask); 5657 if (((ulp->ul_fs_lock & ULOCKFS_MAP_MASK) && 5658 !sig) || ufsvfsp->vfs_dontblock) { 5659 mutex_exit(&ulp->ul_lock); 5660 return (EINTR); 5661 } 5662 } 5663 } 5664 mutex_exit(&ulp->ul_lock); 5665 goto retry_map; 5666 } 5667 5668 vn_a.vp = vp; 5669 vn_a.offset = (u_offset_t)off; 5670 vn_a.type = flags & MAP_TYPE; 5671 vn_a.prot = prot; 5672 vn_a.maxprot = maxprot; 5673 vn_a.cred = cr; 5674 vn_a.amp = NULL; 5675 vn_a.flags = flags & ~MAP_TYPE; 5676 vn_a.szc = 0; 5677 vn_a.lgrp_mem_policy_flags = 0; 5678 5679 error = as_map_locked(as, *addrp, len, segvn_create, &vn_a); 5680 if (ulp) 5681 ufs_lockfs_end(ulp); 5682 as_rangeunlock(as); 5683 out: 5684 return (error); 5685 } 5686 5687 /* ARGSUSED */ 5688 static int 5689 ufs_addmap(struct vnode *vp, 5690 offset_t off, 5691 struct as *as, 5692 caddr_t addr, 5693 size_t len, 5694 uchar_t prot, 5695 uchar_t maxprot, 5696 uint_t flags, 5697 struct cred *cr, 5698 caller_context_t *ct) 5699 { 5700 struct inode *ip = VTOI(vp); 5701 5702 if (vp->v_flag & VNOMAP) { 5703 return (ENOSYS); 5704 } 5705 5706 mutex_enter(&ip->i_tlock); 5707 ip->i_mapcnt += btopr(len); 5708 mutex_exit(&ip->i_tlock); 5709 return (0); 5710 } 5711 5712 /*ARGSUSED*/ 5713 static int 5714 ufs_delmap(struct vnode *vp, offset_t off, struct as *as, caddr_t addr, 5715 size_t len, uint_t prot, uint_t maxprot, uint_t flags, 5716 struct cred *cr, caller_context_t *ct) 5717 { 5718 struct inode *ip = VTOI(vp); 5719 5720 if (vp->v_flag & VNOMAP) { 5721 return (ENOSYS); 5722 } 5723 5724 mutex_enter(&ip->i_tlock); 5725 ip->i_mapcnt -= btopr(len); /* Count released mappings */ 5726 ASSERT(ip->i_mapcnt >= 0); 5727 mutex_exit(&ip->i_tlock); 5728 return (0); 5729 } 5730 /* 5731 * Return the answer requested to poll() for non-device files 5732 */ 5733 struct pollhead ufs_pollhd; 5734 5735 /* ARGSUSED */ 5736 int 5737 ufs_poll(vnode_t *vp, short ev, int any, short *revp, struct pollhead **phpp, 5738 caller_context_t *ct) 5739 { 5740 struct ufsvfs *ufsvfsp; 5741 5742 *revp = 0; 5743 ufsvfsp = VTOI(vp)->i_ufsvfs; 5744 5745 if (!ufsvfsp) { 5746 *revp = POLLHUP; 5747 goto out; 5748 } 5749 5750 if (ULOCKFS_IS_HLOCK(&ufsvfsp->vfs_ulockfs) || 5751 ULOCKFS_IS_ELOCK(&ufsvfsp->vfs_ulockfs)) { 5752 *revp |= POLLERR; 5753 5754 } else { 5755 if ((ev & POLLOUT) && !ufsvfsp->vfs_fs->fs_ronly && 5756 !ULOCKFS_IS_WLOCK(&ufsvfsp->vfs_ulockfs)) 5757 *revp |= POLLOUT; 5758 5759 if ((ev & POLLWRBAND) && !ufsvfsp->vfs_fs->fs_ronly && 5760 !ULOCKFS_IS_WLOCK(&ufsvfsp->vfs_ulockfs)) 5761 *revp |= POLLWRBAND; 5762 5763 if (ev & POLLIN) 5764 *revp |= POLLIN; 5765 5766 if (ev & POLLRDNORM) 5767 *revp |= POLLRDNORM; 5768 5769 if (ev & POLLRDBAND) 5770 *revp |= POLLRDBAND; 5771 } 5772 5773 if ((ev & POLLPRI) && (*revp & (POLLERR|POLLHUP))) 5774 *revp |= POLLPRI; 5775 out: 5776 *phpp = !any && !*revp ? &ufs_pollhd : (struct pollhead *)NULL; 5777 5778 return (0); 5779 } 5780 5781 /* ARGSUSED */ 5782 static int 5783 ufs_l_pathconf(struct vnode *vp, int cmd, ulong_t *valp, struct cred *cr, 5784 caller_context_t *ct) 5785 { 5786 struct ufsvfs *ufsvfsp = VTOI(vp)->i_ufsvfs; 5787 struct ulockfs *ulp = NULL; 5788 struct inode *sip = NULL; 5789 int error; 5790 struct inode *ip = VTOI(vp); 5791 int issync; 5792 5793 error = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_PATHCONF_MASK); 5794 if (error) 5795 return (error); 5796 5797 switch (cmd) { 5798 /* 5799 * Have to handle _PC_NAME_MAX here, because the normal way 5800 * [fs_pathconf() -> VOP_STATVFS() -> ufs_statvfs()] 5801 * results in a lock ordering reversal between 5802 * ufs_lockfs_{begin,end}() and 5803 * ufs_thread_{suspend,continue}(). 5804 * 5805 * Keep in sync with ufs_statvfs(). 5806 */ 5807 case _PC_NAME_MAX: 5808 *valp = MAXNAMLEN; 5809 break; 5810 5811 case _PC_FILESIZEBITS: 5812 if (ufsvfsp->vfs_lfflags & UFS_LARGEFILES) 5813 *valp = UFS_FILESIZE_BITS; 5814 else 5815 *valp = 32; 5816 break; 5817 5818 case _PC_XATTR_EXISTS: 5819 if (vp->v_vfsp->vfs_flag & VFS_XATTR) { 5820 5821 error = 5822 ufs_xattr_getattrdir(vp, &sip, LOOKUP_XATTR, cr); 5823 if (error == 0 && sip != NULL) { 5824 /* Start transaction */ 5825 if (ulp) { 5826 TRANS_BEGIN_CSYNC(ufsvfsp, issync, 5827 TOP_RMDIR, TOP_RMDIR_SIZE); 5828 } 5829 /* 5830 * Is directory empty 5831 */ 5832 rw_enter(&sip->i_rwlock, RW_WRITER); 5833 rw_enter(&sip->i_contents, RW_WRITER); 5834 if (ufs_xattrdirempty(sip, 5835 sip->i_number, CRED())) { 5836 rw_enter(&ip->i_contents, RW_WRITER); 5837 ufs_unhook_shadow(ip, sip); 5838 rw_exit(&ip->i_contents); 5839 5840 *valp = 0; 5841 5842 } else 5843 *valp = 1; 5844 rw_exit(&sip->i_contents); 5845 rw_exit(&sip->i_rwlock); 5846 if (ulp) { 5847 TRANS_END_CSYNC(ufsvfsp, error, issync, 5848 TOP_RMDIR, TOP_RMDIR_SIZE); 5849 } 5850 VN_RELE(ITOV(sip)); 5851 } else if (error == ENOENT) { 5852 *valp = 0; 5853 error = 0; 5854 } 5855 } else { 5856 error = fs_pathconf(vp, cmd, valp, cr, ct); 5857 } 5858 break; 5859 5860 case _PC_ACL_ENABLED: 5861 *valp = _ACL_ACLENT_ENABLED; 5862 break; 5863 5864 case _PC_MIN_HOLE_SIZE: 5865 *valp = (ulong_t)ip->i_fs->fs_bsize; 5866 break; 5867 5868 case _PC_SATTR_ENABLED: 5869 case _PC_SATTR_EXISTS: 5870 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_XVATTR) && 5871 (vp->v_type == VREG || vp->v_type == VDIR); 5872 break; 5873 5874 default: 5875 error = fs_pathconf(vp, cmd, valp, cr, ct); 5876 } 5877 5878 if (ulp != NULL) { 5879 ufs_lockfs_end(ulp); 5880 } 5881 return (error); 5882 } 5883 5884 int ufs_pageio_writes, ufs_pageio_reads; 5885 5886 /*ARGSUSED*/ 5887 static int 5888 ufs_pageio(struct vnode *vp, page_t *pp, u_offset_t io_off, size_t io_len, 5889 int flags, struct cred *cr, caller_context_t *ct) 5890 { 5891 struct inode *ip = VTOI(vp); 5892 struct ufsvfs *ufsvfsp; 5893 page_t *npp = NULL, *opp = NULL, *cpp = pp; 5894 struct buf *bp; 5895 daddr_t bn; 5896 size_t done_len = 0, cur_len = 0; 5897 int err = 0; 5898 int contig = 0; 5899 int dolock; 5900 int vmpss = 0; 5901 struct ulockfs *ulp; 5902 5903 if ((flags & B_READ) && pp != NULL && pp->p_vnode == vp && 5904 vp->v_mpssdata != NULL) { 5905 vmpss = 1; 5906 } 5907 5908 dolock = (rw_owner(&ip->i_contents) != curthread); 5909 /* 5910 * We need a better check. Ideally, we would use another 5911 * vnodeops so that hlocked and forcibly unmounted file 5912 * systems would return EIO where appropriate and w/o the 5913 * need for these checks. 5914 */ 5915 if ((ufsvfsp = ip->i_ufsvfs) == NULL) 5916 return (EIO); 5917 5918 /* 5919 * For vmpss (pp can be NULL) case respect the quiesce protocol. 5920 * ul_lock must be taken before locking pages so we can't use it here 5921 * if pp is non NULL because segvn already locked pages 5922 * SE_EXCL. Instead we rely on the fact that a forced umount or 5923 * applying a filesystem lock via ufs_fiolfs() will block in the 5924 * implicit call to ufs_flush() until we unlock the pages after the 5925 * return to segvn. Other ufs_quiesce() callers keep ufs_quiesce_pend 5926 * above 0 until they are done. We have to be careful not to increment 5927 * ul_vnops_cnt here after forceful unmount hlocks the file system. 5928 * 5929 * If pp is NULL use ul_lock to make sure we don't increment 5930 * ul_vnops_cnt after forceful unmount hlocks the file system. 5931 */ 5932 if (vmpss || pp == NULL) { 5933 ulp = &ufsvfsp->vfs_ulockfs; 5934 if (pp == NULL) 5935 mutex_enter(&ulp->ul_lock); 5936 if (ulp->ul_fs_lock & ULOCKFS_GETREAD_MASK) { 5937 if (pp == NULL) { 5938 mutex_exit(&ulp->ul_lock); 5939 } 5940 return (vmpss ? EIO : EINVAL); 5941 } 5942 atomic_add_long(&ulp->ul_vnops_cnt, 1); 5943 if (pp == NULL) 5944 mutex_exit(&ulp->ul_lock); 5945 if (ufs_quiesce_pend) { 5946 if (!atomic_add_long_nv(&ulp->ul_vnops_cnt, -1)) 5947 cv_broadcast(&ulp->ul_cv); 5948 return (vmpss ? EIO : EINVAL); 5949 } 5950 } 5951 5952 if (dolock) { 5953 /* 5954 * segvn may call VOP_PAGEIO() instead of VOP_GETPAGE() to 5955 * handle a fault against a segment that maps vnode pages with 5956 * large mappings. Segvn creates pages and holds them locked 5957 * SE_EXCL during VOP_PAGEIO() call. In this case we have to 5958 * use rw_tryenter() to avoid a potential deadlock since in 5959 * lock order i_contents needs to be taken first. 5960 * Segvn will retry via VOP_GETPAGE() if VOP_PAGEIO() fails. 5961 */ 5962 if (!vmpss) { 5963 rw_enter(&ip->i_contents, RW_READER); 5964 } else if (!rw_tryenter(&ip->i_contents, RW_READER)) { 5965 if (!atomic_add_long_nv(&ulp->ul_vnops_cnt, -1)) 5966 cv_broadcast(&ulp->ul_cv); 5967 return (EDEADLK); 5968 } 5969 } 5970 5971 /* 5972 * Return an error to segvn because the pagefault request is beyond 5973 * PAGESIZE rounded EOF. 5974 */ 5975 if (vmpss && btopr(io_off + io_len) > btopr(ip->i_size)) { 5976 if (dolock) 5977 rw_exit(&ip->i_contents); 5978 if (!atomic_add_long_nv(&ulp->ul_vnops_cnt, -1)) 5979 cv_broadcast(&ulp->ul_cv); 5980 return (EFAULT); 5981 } 5982 5983 if (pp == NULL) { 5984 if (bmap_has_holes(ip)) { 5985 err = ENOSYS; 5986 } else { 5987 err = EINVAL; 5988 } 5989 if (dolock) 5990 rw_exit(&ip->i_contents); 5991 if (!atomic_add_long_nv(&ulp->ul_vnops_cnt, -1)) 5992 cv_broadcast(&ulp->ul_cv); 5993 return (err); 5994 } 5995 5996 /* 5997 * Break the io request into chunks, one for each contiguous 5998 * stretch of disk blocks in the target file. 5999 */ 6000 while (done_len < io_len) { 6001 ASSERT(cpp); 6002 contig = 0; 6003 if (err = bmap_read(ip, (u_offset_t)(io_off + done_len), 6004 &bn, &contig)) 6005 break; 6006 6007 if (bn == UFS_HOLE) { /* No holey swapfiles */ 6008 if (vmpss) { 6009 err = EFAULT; 6010 break; 6011 } 6012 err = ufs_fault(ITOV(ip), "ufs_pageio: bn == UFS_HOLE"); 6013 break; 6014 } 6015 6016 cur_len = MIN(io_len - done_len, contig); 6017 /* 6018 * Zero out a page beyond EOF, when the last block of 6019 * a file is a UFS fragment so that ufs_pageio() can be used 6020 * instead of ufs_getpage() to handle faults against 6021 * segvn segments that use large pages. 6022 */ 6023 page_list_break(&cpp, &npp, btopr(cur_len)); 6024 if ((flags & B_READ) && (cur_len & PAGEOFFSET)) { 6025 size_t xlen = cur_len & PAGEOFFSET; 6026 pagezero(cpp->p_prev, xlen, PAGESIZE - xlen); 6027 } 6028 6029 bp = pageio_setup(cpp, cur_len, ip->i_devvp, flags); 6030 ASSERT(bp != NULL); 6031 6032 bp->b_edev = ip->i_dev; 6033 bp->b_dev = cmpdev(ip->i_dev); 6034 bp->b_blkno = bn; 6035 bp->b_un.b_addr = (caddr_t)0; 6036 bp->b_file = ip->i_vnode; 6037 6038 ufsvfsp->vfs_iotstamp = lbolt; 6039 ub.ub_pageios.value.ul++; 6040 if (ufsvfsp->vfs_snapshot) 6041 fssnap_strategy(&(ufsvfsp->vfs_snapshot), bp); 6042 else 6043 (void) bdev_strategy(bp); 6044 6045 if (flags & B_READ) 6046 ufs_pageio_reads++; 6047 else 6048 ufs_pageio_writes++; 6049 if (flags & B_READ) 6050 lwp_stat_update(LWP_STAT_INBLK, 1); 6051 else 6052 lwp_stat_update(LWP_STAT_OUBLK, 1); 6053 /* 6054 * If the request is not B_ASYNC, wait for i/o to complete 6055 * and re-assemble the page list to return to the caller. 6056 * If it is B_ASYNC we leave the page list in pieces and 6057 * cleanup() will dispose of them. 6058 */ 6059 if ((flags & B_ASYNC) == 0) { 6060 err = biowait(bp); 6061 pageio_done(bp); 6062 if (err) 6063 break; 6064 page_list_concat(&opp, &cpp); 6065 } 6066 cpp = npp; 6067 npp = NULL; 6068 if (flags & B_READ) 6069 cur_len = P2ROUNDUP_TYPED(cur_len, PAGESIZE, size_t); 6070 done_len += cur_len; 6071 } 6072 ASSERT(err || (cpp == NULL && npp == NULL && done_len == io_len)); 6073 if (err) { 6074 if (flags & B_ASYNC) { 6075 /* Cleanup unprocessed parts of list */ 6076 page_list_concat(&cpp, &npp); 6077 if (flags & B_READ) 6078 pvn_read_done(cpp, B_ERROR); 6079 else 6080 pvn_write_done(cpp, B_ERROR); 6081 } else { 6082 /* Re-assemble list and let caller clean up */ 6083 page_list_concat(&opp, &cpp); 6084 page_list_concat(&opp, &npp); 6085 } 6086 } 6087 6088 if (vmpss && !(ip->i_flag & IACC) && !ULOCKFS_IS_NOIACC(ulp) && 6089 ufsvfsp->vfs_fs->fs_ronly == 0 && !ufsvfsp->vfs_noatime) { 6090 mutex_enter(&ip->i_tlock); 6091 ip->i_flag |= IACC; 6092 ITIMES_NOLOCK(ip); 6093 mutex_exit(&ip->i_tlock); 6094 } 6095 6096 if (dolock) 6097 rw_exit(&ip->i_contents); 6098 if (vmpss && !atomic_add_long_nv(&ulp->ul_vnops_cnt, -1)) 6099 cv_broadcast(&ulp->ul_cv); 6100 return (err); 6101 } 6102 6103 /* 6104 * Called when the kernel is in a frozen state to dump data 6105 * directly to the device. It uses a private dump data structure, 6106 * set up by dump_ctl, to locate the correct disk block to which to dump. 6107 */ 6108 /*ARGSUSED*/ 6109 static int 6110 ufs_dump(vnode_t *vp, caddr_t addr, offset_t ldbn, offset_t dblks, 6111 caller_context_t *ct) 6112 { 6113 u_offset_t file_size; 6114 struct inode *ip = VTOI(vp); 6115 struct fs *fs = ip->i_fs; 6116 daddr_t dbn, lfsbn; 6117 int disk_blks = fs->fs_bsize >> DEV_BSHIFT; 6118 int error = 0; 6119 int ndbs, nfsbs; 6120 6121 /* 6122 * forced unmount case 6123 */ 6124 if (ip->i_ufsvfs == NULL) 6125 return (EIO); 6126 /* 6127 * Validate the inode that it has not been modified since 6128 * the dump structure is allocated. 6129 */ 6130 mutex_enter(&ip->i_tlock); 6131 if ((dump_info == NULL) || 6132 (dump_info->ip != ip) || 6133 (dump_info->time.tv_sec != ip->i_mtime.tv_sec) || 6134 (dump_info->time.tv_usec != ip->i_mtime.tv_usec)) { 6135 mutex_exit(&ip->i_tlock); 6136 return (-1); 6137 } 6138 mutex_exit(&ip->i_tlock); 6139 6140 /* 6141 * See that the file has room for this write 6142 */ 6143 UFS_GET_ISIZE(&file_size, ip); 6144 6145 if (ldbtob(ldbn + dblks) > file_size) 6146 return (ENOSPC); 6147 6148 /* 6149 * Find the physical disk block numbers from the dump 6150 * private data structure directly and write out the data 6151 * in contiguous block lumps 6152 */ 6153 while (dblks > 0 && !error) { 6154 lfsbn = (daddr_t)lblkno(fs, ldbtob(ldbn)); 6155 dbn = fsbtodb(fs, dump_info->dblk[lfsbn]) + ldbn % disk_blks; 6156 nfsbs = 1; 6157 ndbs = disk_blks - ldbn % disk_blks; 6158 while (ndbs < dblks && fsbtodb(fs, dump_info->dblk[lfsbn + 6159 nfsbs]) == dbn + ndbs) { 6160 nfsbs++; 6161 ndbs += disk_blks; 6162 } 6163 if (ndbs > dblks) 6164 ndbs = dblks; 6165 error = bdev_dump(ip->i_dev, addr, dbn, ndbs); 6166 addr += ldbtob((offset_t)ndbs); 6167 dblks -= ndbs; 6168 ldbn += ndbs; 6169 } 6170 return (error); 6171 6172 } 6173 6174 /* 6175 * Prepare the file system before and after the dump operation. 6176 * 6177 * action = DUMP_ALLOC: 6178 * Preparation before dump, allocate dump private data structure 6179 * to hold all the direct and indirect block info for dump. 6180 * 6181 * action = DUMP_FREE: 6182 * Clean up after dump, deallocate the dump private data structure. 6183 * 6184 * action = DUMP_SCAN: 6185 * Scan dump_info for *blkp DEV_BSIZE blocks of contig fs space; 6186 * if found, the starting file-relative DEV_BSIZE lbn is written 6187 * to *bklp; that lbn is intended for use with VOP_DUMP() 6188 */ 6189 /*ARGSUSED*/ 6190 static int 6191 ufs_dumpctl(vnode_t *vp, int action, offset_t *blkp, caller_context_t *ct) 6192 { 6193 struct inode *ip = VTOI(vp); 6194 ufsvfs_t *ufsvfsp = ip->i_ufsvfs; 6195 struct fs *fs; 6196 daddr32_t *dblk, *storeblk; 6197 daddr32_t *nextblk, *endblk; 6198 struct buf *bp; 6199 int i, entry, entries; 6200 int n, ncontig; 6201 6202 /* 6203 * check for forced unmount 6204 */ 6205 if (ufsvfsp == NULL) 6206 return (EIO); 6207 6208 if (action == DUMP_ALLOC) { 6209 /* 6210 * alloc and record dump_info 6211 */ 6212 if (dump_info != NULL) 6213 return (EINVAL); 6214 6215 ASSERT(vp->v_type == VREG); 6216 fs = ufsvfsp->vfs_fs; 6217 6218 rw_enter(&ip->i_contents, RW_READER); 6219 6220 if (bmap_has_holes(ip)) { 6221 rw_exit(&ip->i_contents); 6222 return (EFAULT); 6223 } 6224 6225 /* 6226 * calculate and allocate space needed according to i_size 6227 */ 6228 entries = (int)lblkno(fs, blkroundup(fs, ip->i_size)); 6229 dump_info = kmem_alloc(sizeof (struct dump) + 6230 (entries - 1) * sizeof (daddr32_t), KM_NOSLEEP); 6231 if (dump_info == NULL) { 6232 rw_exit(&ip->i_contents); 6233 return (ENOMEM); 6234 } 6235 6236 /* Start saving the info */ 6237 dump_info->fsbs = entries; 6238 dump_info->ip = ip; 6239 storeblk = &dump_info->dblk[0]; 6240 6241 /* Direct Blocks */ 6242 for (entry = 0; entry < NDADDR && entry < entries; entry++) 6243 *storeblk++ = ip->i_db[entry]; 6244 6245 /* Indirect Blocks */ 6246 for (i = 0; i < NIADDR; i++) { 6247 int error = 0; 6248 6249 bp = UFS_BREAD(ufsvfsp, 6250 ip->i_dev, fsbtodb(fs, ip->i_ib[i]), fs->fs_bsize); 6251 if (bp->b_flags & B_ERROR) 6252 error = EIO; 6253 else { 6254 dblk = bp->b_un.b_daddr; 6255 if ((storeblk = save_dblks(ip, ufsvfsp, 6256 storeblk, dblk, i, entries)) == NULL) 6257 error = EIO; 6258 } 6259 6260 brelse(bp); 6261 6262 if (error != 0) { 6263 kmem_free(dump_info, sizeof (struct dump) + 6264 (entries - 1) * sizeof (daddr32_t)); 6265 rw_exit(&ip->i_contents); 6266 dump_info = NULL; 6267 return (error); 6268 } 6269 } 6270 /* and time stamp the information */ 6271 mutex_enter(&ip->i_tlock); 6272 dump_info->time = ip->i_mtime; 6273 mutex_exit(&ip->i_tlock); 6274 6275 rw_exit(&ip->i_contents); 6276 } else if (action == DUMP_FREE) { 6277 /* 6278 * free dump_info 6279 */ 6280 if (dump_info == NULL) 6281 return (EINVAL); 6282 entries = dump_info->fsbs - 1; 6283 kmem_free(dump_info, sizeof (struct dump) + 6284 entries * sizeof (daddr32_t)); 6285 dump_info = NULL; 6286 } else if (action == DUMP_SCAN) { 6287 /* 6288 * scan dump_info 6289 */ 6290 if (dump_info == NULL) 6291 return (EINVAL); 6292 6293 dblk = dump_info->dblk; 6294 nextblk = dblk + 1; 6295 endblk = dblk + dump_info->fsbs - 1; 6296 fs = ufsvfsp->vfs_fs; 6297 ncontig = *blkp >> (fs->fs_bshift - DEV_BSHIFT); 6298 6299 /* 6300 * scan dblk[] entries; contig fs space is found when: 6301 * ((current blkno + frags per block) == next blkno) 6302 */ 6303 n = 0; 6304 while (n < ncontig && dblk < endblk) { 6305 if ((*dblk + fs->fs_frag) == *nextblk) 6306 n++; 6307 else 6308 n = 0; 6309 dblk++; 6310 nextblk++; 6311 } 6312 6313 /* 6314 * index is where size bytes of contig space begins; 6315 * conversion from index to the file's DEV_BSIZE lbn 6316 * is equivalent to: (index * fs_bsize) / DEV_BSIZE 6317 */ 6318 if (n == ncontig) { 6319 i = (dblk - dump_info->dblk) - ncontig; 6320 *blkp = i << (fs->fs_bshift - DEV_BSHIFT); 6321 } else 6322 return (EFAULT); 6323 } 6324 return (0); 6325 } 6326 6327 /* 6328 * Recursive helper function for ufs_dumpctl(). It follows the indirect file 6329 * system blocks until it reaches the the disk block addresses, which are 6330 * then stored into the given buffer, storeblk. 6331 */ 6332 static daddr32_t * 6333 save_dblks(struct inode *ip, struct ufsvfs *ufsvfsp, daddr32_t *storeblk, 6334 daddr32_t *dblk, int level, int entries) 6335 { 6336 struct fs *fs = ufsvfsp->vfs_fs; 6337 struct buf *bp; 6338 int i; 6339 6340 if (level == 0) { 6341 for (i = 0; i < NINDIR(fs); i++) { 6342 if (storeblk - dump_info->dblk >= entries) 6343 break; 6344 *storeblk++ = dblk[i]; 6345 } 6346 return (storeblk); 6347 } 6348 for (i = 0; i < NINDIR(fs); i++) { 6349 if (storeblk - dump_info->dblk >= entries) 6350 break; 6351 bp = UFS_BREAD(ufsvfsp, 6352 ip->i_dev, fsbtodb(fs, dblk[i]), fs->fs_bsize); 6353 if (bp->b_flags & B_ERROR) { 6354 brelse(bp); 6355 return (NULL); 6356 } 6357 storeblk = save_dblks(ip, ufsvfsp, storeblk, bp->b_un.b_daddr, 6358 level - 1, entries); 6359 brelse(bp); 6360 6361 if (storeblk == NULL) 6362 return (NULL); 6363 } 6364 return (storeblk); 6365 } 6366 6367 /* ARGSUSED */ 6368 static int 6369 ufs_getsecattr(struct vnode *vp, vsecattr_t *vsap, int flag, 6370 struct cred *cr, caller_context_t *ct) 6371 { 6372 struct inode *ip = VTOI(vp); 6373 struct ulockfs *ulp; 6374 struct ufsvfs *ufsvfsp = ip->i_ufsvfs; 6375 ulong_t vsa_mask = vsap->vsa_mask; 6376 int err = EINVAL; 6377 6378 vsa_mask &= (VSA_ACL | VSA_ACLCNT | VSA_DFACL | VSA_DFACLCNT); 6379 6380 /* 6381 * Only grab locks if needed - they're not needed to check vsa_mask 6382 * or if the mask contains no acl flags. 6383 */ 6384 if (vsa_mask != 0) { 6385 if (err = ufs_lockfs_begin(ufsvfsp, &ulp, 6386 ULOCKFS_GETATTR_MASK)) 6387 return (err); 6388 6389 rw_enter(&ip->i_contents, RW_READER); 6390 err = ufs_acl_get(ip, vsap, flag, cr); 6391 rw_exit(&ip->i_contents); 6392 6393 if (ulp) 6394 ufs_lockfs_end(ulp); 6395 } 6396 return (err); 6397 } 6398 6399 /* ARGSUSED */ 6400 static int 6401 ufs_setsecattr(struct vnode *vp, vsecattr_t *vsap, int flag, struct cred *cr, 6402 caller_context_t *ct) 6403 { 6404 struct inode *ip = VTOI(vp); 6405 struct ulockfs *ulp = NULL; 6406 struct ufsvfs *ufsvfsp = VTOI(vp)->i_ufsvfs; 6407 ulong_t vsa_mask = vsap->vsa_mask; 6408 int err; 6409 int haverwlock = 1; 6410 int trans_size; 6411 int donetrans = 0; 6412 int retry = 1; 6413 6414 ASSERT(RW_LOCK_HELD(&ip->i_rwlock)); 6415 6416 /* Abort now if the request is either empty or invalid. */ 6417 vsa_mask &= (VSA_ACL | VSA_ACLCNT | VSA_DFACL | VSA_DFACLCNT); 6418 if ((vsa_mask == 0) || 6419 ((vsap->vsa_aclentp == NULL) && 6420 (vsap->vsa_dfaclentp == NULL))) { 6421 err = EINVAL; 6422 goto out; 6423 } 6424 6425 /* 6426 * Following convention, if this is a directory then we acquire the 6427 * inode's i_rwlock after starting a UFS logging transaction; 6428 * otherwise, we acquire it beforehand. Since we were called (and 6429 * must therefore return) with the lock held, we will have to drop it, 6430 * and later reacquire it, if operating on a directory. 6431 */ 6432 if (vp->v_type == VDIR) { 6433 rw_exit(&ip->i_rwlock); 6434 haverwlock = 0; 6435 } else { 6436 /* Upgrade the lock if required. */ 6437 if (!rw_write_held(&ip->i_rwlock)) { 6438 rw_exit(&ip->i_rwlock); 6439 rw_enter(&ip->i_rwlock, RW_WRITER); 6440 } 6441 } 6442 6443 again: 6444 ASSERT(!(vp->v_type == VDIR && haverwlock)); 6445 if (err = ufs_lockfs_begin(ufsvfsp, &ulp, ULOCKFS_SETATTR_MASK)) { 6446 ulp = NULL; 6447 retry = 0; 6448 goto out; 6449 } 6450 6451 /* 6452 * Check that the file system supports this operation. Note that 6453 * ufs_lockfs_begin() will have checked that the file system had 6454 * not been forcibly unmounted. 6455 */ 6456 if (ufsvfsp->vfs_fs->fs_ronly) { 6457 err = EROFS; 6458 goto out; 6459 } 6460 if (ufsvfsp->vfs_nosetsec) { 6461 err = ENOSYS; 6462 goto out; 6463 } 6464 6465 if (ulp) { 6466 TRANS_BEGIN_ASYNC(ufsvfsp, TOP_SETSECATTR, 6467 trans_size = TOP_SETSECATTR_SIZE(VTOI(vp))); 6468 donetrans = 1; 6469 } 6470 6471 if (vp->v_type == VDIR) { 6472 rw_enter(&ip->i_rwlock, RW_WRITER); 6473 haverwlock = 1; 6474 } 6475 6476 ASSERT(haverwlock); 6477 6478 /* Do the actual work. */ 6479 rw_enter(&ip->i_contents, RW_WRITER); 6480 /* 6481 * Suppress out of inodes messages if we will retry. 6482 */ 6483 if (retry) 6484 ip->i_flag |= IQUIET; 6485 err = ufs_acl_set(ip, vsap, flag, cr); 6486 ip->i_flag &= ~IQUIET; 6487 rw_exit(&ip->i_contents); 6488 6489 out: 6490 if (ulp) { 6491 if (donetrans) { 6492 /* 6493 * top_end_async() can eventually call 6494 * top_end_sync(), which can block. We must 6495 * therefore observe the lock-ordering protocol 6496 * here as well. 6497 */ 6498 if (vp->v_type == VDIR) { 6499 rw_exit(&ip->i_rwlock); 6500 haverwlock = 0; 6501 } 6502 TRANS_END_ASYNC(ufsvfsp, TOP_SETSECATTR, trans_size); 6503 } 6504 ufs_lockfs_end(ulp); 6505 } 6506 /* 6507 * If no inodes available, try scaring a logically- 6508 * free one out of the delete queue to someplace 6509 * that we can find it. 6510 */ 6511 if ((err == ENOSPC) && retry && TRANS_ISTRANS(ufsvfsp)) { 6512 ufs_delete_drain_wait(ufsvfsp, 1); 6513 retry = 0; 6514 if (vp->v_type == VDIR && haverwlock) { 6515 rw_exit(&ip->i_rwlock); 6516 haverwlock = 0; 6517 } 6518 goto again; 6519 } 6520 /* 6521 * If we need to reacquire the lock then it is safe to do so 6522 * as a reader. This is because ufs_rwunlock(), which will be 6523 * called by our caller after we return, does not differentiate 6524 * between shared and exclusive locks. 6525 */ 6526 if (!haverwlock) { 6527 ASSERT(vp->v_type == VDIR); 6528 rw_enter(&ip->i_rwlock, RW_READER); 6529 } 6530 6531 return (err); 6532 } 6533