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