1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/namei.h> 15 #include <linux/mm.h> 16 #include <linux/xattr.h> 17 #include <linux/posix_acl.h> 18 #include <linux/gfs2_ondisk.h> 19 #include <linux/crc32.h> 20 #include <linux/fiemap.h> 21 #include <linux/security.h> 22 #include <asm/uaccess.h> 23 24 #include "gfs2.h" 25 #include "incore.h" 26 #include "acl.h" 27 #include "bmap.h" 28 #include "dir.h" 29 #include "xattr.h" 30 #include "glock.h" 31 #include "inode.h" 32 #include "meta_io.h" 33 #include "quota.h" 34 #include "rgrp.h" 35 #include "trans.h" 36 #include "util.h" 37 #include "super.h" 38 #include "glops.h" 39 40 struct gfs2_skip_data { 41 u64 no_addr; 42 int skipped; 43 int non_block; 44 }; 45 46 static int iget_test(struct inode *inode, void *opaque) 47 { 48 struct gfs2_inode *ip = GFS2_I(inode); 49 struct gfs2_skip_data *data = opaque; 50 51 if (ip->i_no_addr == data->no_addr) { 52 if (data->non_block && 53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) { 54 data->skipped = 1; 55 return 0; 56 } 57 return 1; 58 } 59 return 0; 60 } 61 62 static int iget_set(struct inode *inode, void *opaque) 63 { 64 struct gfs2_inode *ip = GFS2_I(inode); 65 struct gfs2_skip_data *data = opaque; 66 67 if (data->skipped) 68 return -ENOENT; 69 inode->i_ino = (unsigned long)(data->no_addr); 70 ip->i_no_addr = data->no_addr; 71 return 0; 72 } 73 74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block) 75 { 76 unsigned long hash = (unsigned long)no_addr; 77 struct gfs2_skip_data data; 78 79 data.no_addr = no_addr; 80 data.skipped = 0; 81 data.non_block = non_block; 82 return ilookup5(sb, hash, iget_test, &data); 83 } 84 85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr, 86 int non_block) 87 { 88 struct gfs2_skip_data data; 89 unsigned long hash = (unsigned long)no_addr; 90 91 data.no_addr = no_addr; 92 data.skipped = 0; 93 data.non_block = non_block; 94 return iget5_locked(sb, hash, iget_test, iget_set, &data); 95 } 96 97 /** 98 * gfs2_set_iop - Sets inode operations 99 * @inode: The inode with correct i_mode filled in 100 * 101 * GFS2 lookup code fills in vfs inode contents based on info obtained 102 * from directory entry inside gfs2_inode_lookup(). 103 */ 104 105 static void gfs2_set_iop(struct inode *inode) 106 { 107 struct gfs2_sbd *sdp = GFS2_SB(inode); 108 umode_t mode = inode->i_mode; 109 110 if (S_ISREG(mode)) { 111 inode->i_op = &gfs2_file_iops; 112 if (gfs2_localflocks(sdp)) 113 inode->i_fop = &gfs2_file_fops_nolock; 114 else 115 inode->i_fop = &gfs2_file_fops; 116 } else if (S_ISDIR(mode)) { 117 inode->i_op = &gfs2_dir_iops; 118 if (gfs2_localflocks(sdp)) 119 inode->i_fop = &gfs2_dir_fops_nolock; 120 else 121 inode->i_fop = &gfs2_dir_fops; 122 } else if (S_ISLNK(mode)) { 123 inode->i_op = &gfs2_symlink_iops; 124 } else { 125 inode->i_op = &gfs2_file_iops; 126 init_special_inode(inode, inode->i_mode, inode->i_rdev); 127 } 128 } 129 130 /** 131 * gfs2_inode_lookup - Lookup an inode 132 * @sb: The super block 133 * @no_addr: The inode number 134 * @type: The type of the inode 135 * non_block: Can we block on inodes that are being freed? 136 * 137 * Returns: A VFS inode, or an error 138 */ 139 140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 141 u64 no_addr, u64 no_formal_ino, int non_block) 142 { 143 struct inode *inode; 144 struct gfs2_inode *ip; 145 struct gfs2_glock *io_gl = NULL; 146 int error; 147 148 inode = gfs2_iget(sb, no_addr, non_block); 149 ip = GFS2_I(inode); 150 151 if (!inode) 152 return ERR_PTR(-ENOBUFS); 153 154 if (inode->i_state & I_NEW) { 155 struct gfs2_sbd *sdp = GFS2_SB(inode); 156 ip->i_no_formal_ino = no_formal_ino; 157 158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 159 if (unlikely(error)) 160 goto fail; 161 ip->i_gl->gl_object = ip; 162 163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 164 if (unlikely(error)) 165 goto fail_put; 166 167 set_bit(GIF_INVALID, &ip->i_flags); 168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 169 if (unlikely(error)) 170 goto fail_iopen; 171 172 ip->i_iopen_gh.gh_gl->gl_object = ip; 173 gfs2_glock_put(io_gl); 174 io_gl = NULL; 175 176 if (type == DT_UNKNOWN) { 177 /* Inode glock must be locked already */ 178 error = gfs2_inode_refresh(GFS2_I(inode)); 179 if (error) 180 goto fail_refresh; 181 } else { 182 inode->i_mode = DT2IF(type); 183 } 184 185 gfs2_set_iop(inode); 186 unlock_new_inode(inode); 187 } 188 189 return inode; 190 191 fail_refresh: 192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 193 ip->i_iopen_gh.gh_gl->gl_object = NULL; 194 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 195 fail_iopen: 196 if (io_gl) 197 gfs2_glock_put(io_gl); 198 fail_put: 199 ip->i_gl->gl_object = NULL; 200 gfs2_glock_put(ip->i_gl); 201 fail: 202 iget_failed(inode); 203 return ERR_PTR(error); 204 } 205 206 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 207 u64 *no_formal_ino, unsigned int blktype) 208 { 209 struct super_block *sb = sdp->sd_vfs; 210 struct gfs2_holder i_gh; 211 struct inode *inode = NULL; 212 int error; 213 214 /* Must not read in block until block type is verified */ 215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, 216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); 217 if (error) 218 return ERR_PTR(error); 219 220 error = gfs2_check_blk_type(sdp, no_addr, blktype); 221 if (error) 222 goto fail; 223 224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); 225 if (IS_ERR(inode)) 226 goto fail; 227 228 /* Two extra checks for NFS only */ 229 if (no_formal_ino) { 230 error = -ESTALE; 231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) 232 goto fail_iput; 233 234 error = -EIO; 235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 236 goto fail_iput; 237 238 error = 0; 239 } 240 241 fail: 242 gfs2_glock_dq_uninit(&i_gh); 243 return error ? ERR_PTR(error) : inode; 244 fail_iput: 245 iput(inode); 246 goto fail; 247 } 248 249 250 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 251 { 252 struct qstr qstr; 253 struct inode *inode; 254 gfs2_str2qstr(&qstr, name); 255 inode = gfs2_lookupi(dip, &qstr, 1); 256 /* gfs2_lookupi has inconsistent callers: vfs 257 * related routines expect NULL for no entry found, 258 * gfs2_lookup_simple callers expect ENOENT 259 * and do not check for NULL. 260 */ 261 if (inode == NULL) 262 return ERR_PTR(-ENOENT); 263 else 264 return inode; 265 } 266 267 268 /** 269 * gfs2_lookupi - Look up a filename in a directory and return its inode 270 * @d_gh: An initialized holder for the directory glock 271 * @name: The name of the inode to look for 272 * @is_root: If 1, ignore the caller's permissions 273 * @i_gh: An uninitialized holder for the new inode glock 274 * 275 * This can be called via the VFS filldir function when NFS is doing 276 * a readdirplus and the inode which its intending to stat isn't 277 * already in cache. In this case we must not take the directory glock 278 * again, since the readdir call will have already taken that lock. 279 * 280 * Returns: errno 281 */ 282 283 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 284 int is_root) 285 { 286 struct super_block *sb = dir->i_sb; 287 struct gfs2_inode *dip = GFS2_I(dir); 288 struct gfs2_holder d_gh; 289 int error = 0; 290 struct inode *inode = NULL; 291 int unlock = 0; 292 293 if (!name->len || name->len > GFS2_FNAMESIZE) 294 return ERR_PTR(-ENAMETOOLONG); 295 296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 298 dir == sb->s_root->d_inode)) { 299 igrab(dir); 300 return dir; 301 } 302 303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 305 if (error) 306 return ERR_PTR(error); 307 unlock = 1; 308 } 309 310 if (!is_root) { 311 error = gfs2_permission(dir, MAY_EXEC); 312 if (error) 313 goto out; 314 } 315 316 inode = gfs2_dir_search(dir, name, false); 317 if (IS_ERR(inode)) 318 error = PTR_ERR(inode); 319 out: 320 if (unlock) 321 gfs2_glock_dq_uninit(&d_gh); 322 if (error == -ENOENT) 323 return NULL; 324 return inode ? inode : ERR_PTR(error); 325 } 326 327 /** 328 * create_ok - OK to create a new on-disk inode here? 329 * @dip: Directory in which dinode is to be created 330 * @name: Name of new dinode 331 * @mode: 332 * 333 * Returns: errno 334 */ 335 336 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 337 umode_t mode) 338 { 339 int error; 340 341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 342 if (error) 343 return error; 344 345 /* Don't create entries in an unlinked directory */ 346 if (!dip->i_inode.i_nlink) 347 return -ENOENT; 348 349 if (dip->i_entries == (u32)-1) 350 return -EFBIG; 351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 352 return -EMLINK; 353 354 return 0; 355 } 356 357 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 358 struct inode *inode) 359 { 360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 361 (dip->i_inode.i_mode & S_ISUID) && 362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 363 if (S_ISDIR(inode->i_mode)) 364 inode->i_mode |= S_ISUID; 365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 366 inode->i_mode &= ~07111; 367 inode->i_uid = dip->i_inode.i_uid; 368 } else 369 inode->i_uid = current_fsuid(); 370 371 if (dip->i_inode.i_mode & S_ISGID) { 372 if (S_ISDIR(inode->i_mode)) 373 inode->i_mode |= S_ISGID; 374 inode->i_gid = dip->i_inode.i_gid; 375 } else 376 inode->i_gid = current_fsgid(); 377 } 378 379 static int alloc_dinode(struct gfs2_inode *ip, u32 flags) 380 { 381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 382 int error; 383 int dblocks = 1; 384 385 error = gfs2_quota_lock_check(ip); 386 if (error) 387 goto out; 388 389 error = gfs2_inplace_reserve(ip, RES_DINODE, flags); 390 if (error) 391 goto out_quota; 392 393 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0); 394 if (error) 395 goto out_ipreserv; 396 397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation); 398 ip->i_no_formal_ino = ip->i_generation; 399 ip->i_inode.i_ino = ip->i_no_addr; 400 ip->i_goal = ip->i_no_addr; 401 402 gfs2_trans_end(sdp); 403 404 out_ipreserv: 405 gfs2_inplace_release(ip); 406 out_quota: 407 gfs2_quota_unlock(ip); 408 out: 409 return error; 410 } 411 412 static void gfs2_init_dir(struct buffer_head *dibh, 413 const struct gfs2_inode *parent) 414 { 415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 417 418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 419 dent->de_inum = di->di_num; /* already GFS2 endian */ 420 dent->de_type = cpu_to_be16(DT_DIR); 421 422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 424 gfs2_inum_out(parent, dent); 425 dent->de_type = cpu_to_be16(DT_DIR); 426 427 } 428 429 /** 430 * init_dinode - Fill in a new dinode structure 431 * @dip: The directory this inode is being created in 432 * @ip: The inode 433 * @symname: The symlink destination (if a symlink) 434 * @bhp: The buffer head (returned to caller) 435 * 436 */ 437 438 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 439 const char *symname) 440 { 441 struct gfs2_dinode *di; 442 struct buffer_head *dibh; 443 444 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 445 gfs2_trans_add_meta(ip->i_gl, dibh); 446 di = (struct gfs2_dinode *)dibh->b_data; 447 gfs2_dinode_out(ip, di); 448 449 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 450 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 451 di->__pad1 = 0; 452 di->__pad2 = 0; 453 di->__pad3 = 0; 454 memset(&di->__pad4, 0, sizeof(di->__pad4)); 455 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 456 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 457 458 switch(ip->i_inode.i_mode & S_IFMT) { 459 case S_IFDIR: 460 gfs2_init_dir(dibh, dip); 461 break; 462 case S_IFLNK: 463 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 464 break; 465 } 466 467 set_buffer_uptodate(dibh); 468 brelse(dibh); 469 } 470 471 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 472 struct gfs2_inode *ip, int arq) 473 { 474 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 475 int error; 476 477 if (arq) { 478 error = gfs2_quota_lock_check(dip); 479 if (error) 480 goto fail_quota_locks; 481 482 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); 483 if (error) 484 goto fail_quota_locks; 485 486 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 487 dip->i_rgd->rd_length + 488 2 * RES_DINODE + 489 RES_STATFS + RES_QUOTA, 0); 490 if (error) 491 goto fail_ipreserv; 492 } else { 493 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 494 if (error) 495 goto fail_quota_locks; 496 } 497 498 error = gfs2_dir_add(&dip->i_inode, name, ip); 499 if (error) 500 goto fail_end_trans; 501 502 fail_end_trans: 503 gfs2_trans_end(sdp); 504 fail_ipreserv: 505 gfs2_inplace_release(dip); 506 fail_quota_locks: 507 gfs2_quota_unlock(dip); 508 return error; 509 } 510 511 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 512 void *fs_info) 513 { 514 const struct xattr *xattr; 515 int err = 0; 516 517 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 518 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 519 xattr->value_len, 0, 520 GFS2_EATYPE_SECURITY); 521 if (err < 0) 522 break; 523 } 524 return err; 525 } 526 527 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 528 const struct qstr *qstr) 529 { 530 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 531 &gfs2_initxattrs, NULL); 532 } 533 534 /** 535 * gfs2_create_inode - Create a new inode 536 * @dir: The parent directory 537 * @dentry: The new dentry 538 * @file: If non-NULL, the file which is being opened 539 * @mode: The permissions on the new inode 540 * @dev: For device nodes, this is the device number 541 * @symname: For symlinks, this is the link destination 542 * @size: The initial size of the inode (ignored for directories) 543 * 544 * Returns: 0 on success, or error code 545 */ 546 547 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 548 struct file *file, 549 umode_t mode, dev_t dev, const char *symname, 550 unsigned int size, int excl, int *opened) 551 { 552 const struct qstr *name = &dentry->d_name; 553 struct gfs2_holder ghs[2]; 554 struct inode *inode = NULL; 555 struct gfs2_inode *dip = GFS2_I(dir), *ip; 556 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 557 struct gfs2_glock *io_gl; 558 struct dentry *d; 559 int error; 560 u32 aflags = 0; 561 int arq; 562 563 if (!name->len || name->len > GFS2_FNAMESIZE) 564 return -ENAMETOOLONG; 565 566 error = gfs2_rs_alloc(dip); 567 if (error) 568 return error; 569 570 error = gfs2_rindex_update(sdp); 571 if (error) 572 return error; 573 574 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 575 if (error) 576 goto fail; 577 578 error = create_ok(dip, name, mode); 579 if (error) 580 goto fail_gunlock; 581 582 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 583 error = PTR_ERR(inode); 584 if (!IS_ERR(inode)) { 585 d = d_splice_alias(inode, dentry); 586 error = 0; 587 if (file && !IS_ERR(d)) { 588 if (d == NULL) 589 d = dentry; 590 if (S_ISREG(inode->i_mode)) 591 error = finish_open(file, d, gfs2_open_common, opened); 592 else 593 error = finish_no_open(file, d); 594 } 595 gfs2_glock_dq_uninit(ghs); 596 if (IS_ERR(d)) 597 return PTR_RET(d); 598 return error; 599 } else if (error != -ENOENT) { 600 goto fail_gunlock; 601 } 602 603 arq = error = gfs2_diradd_alloc_required(dir, name); 604 if (error < 0) 605 goto fail_gunlock; 606 607 inode = new_inode(sdp->sd_vfs); 608 error = -ENOMEM; 609 if (!inode) 610 goto fail_gunlock; 611 612 ip = GFS2_I(inode); 613 error = gfs2_rs_alloc(ip); 614 if (error) 615 goto fail_free_inode; 616 617 inode->i_mode = mode; 618 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 619 inode->i_rdev = dev; 620 inode->i_size = size; 621 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 622 gfs2_set_inode_blocks(inode, 1); 623 munge_mode_uid_gid(dip, inode); 624 ip->i_goal = dip->i_goal; 625 ip->i_diskflags = 0; 626 ip->i_eattr = 0; 627 ip->i_height = 0; 628 ip->i_depth = 0; 629 ip->i_entries = 0; 630 631 switch(mode & S_IFMT) { 632 case S_IFREG: 633 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 634 gfs2_tune_get(sdp, gt_new_files_jdata)) 635 ip->i_diskflags |= GFS2_DIF_JDATA; 636 gfs2_set_aops(inode); 637 break; 638 case S_IFDIR: 639 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 640 ip->i_diskflags |= GFS2_DIF_JDATA; 641 ip->i_entries = 2; 642 break; 643 } 644 gfs2_set_inode_flags(inode); 645 646 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 647 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 648 aflags |= GFS2_AF_ORLOV; 649 650 error = alloc_dinode(ip, aflags); 651 if (error) 652 goto fail_free_inode; 653 654 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 655 if (error) 656 goto fail_free_inode; 657 658 ip->i_gl->gl_object = ip; 659 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 660 if (error) 661 goto fail_free_inode; 662 663 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 664 if (error) 665 goto fail_gunlock2; 666 667 init_dinode(dip, ip, symname); 668 gfs2_trans_end(sdp); 669 670 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 671 if (error) 672 goto fail_gunlock2; 673 674 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 675 if (error) 676 goto fail_gunlock2; 677 678 ip->i_iopen_gh.gh_gl->gl_object = ip; 679 gfs2_glock_put(io_gl); 680 gfs2_set_iop(inode); 681 insert_inode_hash(inode); 682 683 error = gfs2_acl_create(dip, inode); 684 if (error) 685 goto fail_gunlock3; 686 687 error = gfs2_security_init(dip, ip, name); 688 if (error) 689 goto fail_gunlock3; 690 691 error = link_dinode(dip, name, ip, arq); 692 if (error) 693 goto fail_gunlock3; 694 695 mark_inode_dirty(inode); 696 d_instantiate(dentry, inode); 697 if (file) 698 error = finish_open(file, dentry, gfs2_open_common, opened); 699 gfs2_glock_dq_uninit(ghs); 700 gfs2_glock_dq_uninit(ghs + 1); 701 return error; 702 703 fail_gunlock3: 704 gfs2_glock_dq_uninit(ghs + 1); 705 if (ip->i_gl) 706 gfs2_glock_put(ip->i_gl); 707 goto fail_gunlock; 708 709 fail_gunlock2: 710 gfs2_glock_dq_uninit(ghs + 1); 711 fail_free_inode: 712 if (ip->i_gl) 713 gfs2_glock_put(ip->i_gl); 714 gfs2_rs_delete(ip); 715 free_inode_nonrcu(inode); 716 inode = NULL; 717 fail_gunlock: 718 gfs2_glock_dq_uninit(ghs); 719 if (inode && !IS_ERR(inode)) { 720 clear_nlink(inode); 721 mark_inode_dirty(inode); 722 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 723 iput(inode); 724 } 725 fail: 726 return error; 727 } 728 729 /** 730 * gfs2_create - Create a file 731 * @dir: The directory in which to create the file 732 * @dentry: The dentry of the new file 733 * @mode: The mode of the new file 734 * 735 * Returns: errno 736 */ 737 738 static int gfs2_create(struct inode *dir, struct dentry *dentry, 739 umode_t mode, bool excl) 740 { 741 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 742 } 743 744 /** 745 * __gfs2_lookup - Look up a filename in a directory and return its inode 746 * @dir: The directory inode 747 * @dentry: The dentry of the new inode 748 * @file: File to be opened 749 * @opened: atomic_open flags 750 * 751 * 752 * Returns: errno 753 */ 754 755 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 756 struct file *file, int *opened) 757 { 758 struct inode *inode; 759 struct dentry *d; 760 struct gfs2_holder gh; 761 struct gfs2_glock *gl; 762 int error; 763 764 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 765 if (!inode) 766 return NULL; 767 if (IS_ERR(inode)) 768 return ERR_CAST(inode); 769 770 gl = GFS2_I(inode)->i_gl; 771 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 772 if (error) { 773 iput(inode); 774 return ERR_PTR(error); 775 } 776 777 d = d_splice_alias(inode, dentry); 778 if (file && S_ISREG(inode->i_mode)) 779 error = finish_open(file, dentry, gfs2_open_common, opened); 780 781 gfs2_glock_dq_uninit(&gh); 782 if (error) 783 return ERR_PTR(error); 784 return d; 785 } 786 787 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 788 unsigned flags) 789 { 790 return __gfs2_lookup(dir, dentry, NULL, NULL); 791 } 792 793 /** 794 * gfs2_link - Link to a file 795 * @old_dentry: The inode to link 796 * @dir: Add link to this directory 797 * @dentry: The name of the link 798 * 799 * Link the inode in "old_dentry" into the directory "dir" with the 800 * name in "dentry". 801 * 802 * Returns: errno 803 */ 804 805 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 806 struct dentry *dentry) 807 { 808 struct gfs2_inode *dip = GFS2_I(dir); 809 struct gfs2_sbd *sdp = GFS2_SB(dir); 810 struct inode *inode = old_dentry->d_inode; 811 struct gfs2_inode *ip = GFS2_I(inode); 812 struct gfs2_holder ghs[2]; 813 struct buffer_head *dibh; 814 int alloc_required; 815 int error; 816 817 if (S_ISDIR(inode->i_mode)) 818 return -EPERM; 819 820 error = gfs2_rs_alloc(dip); 821 if (error) 822 return error; 823 824 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 825 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 826 827 error = gfs2_glock_nq(ghs); /* parent */ 828 if (error) 829 goto out_parent; 830 831 error = gfs2_glock_nq(ghs + 1); /* child */ 832 if (error) 833 goto out_child; 834 835 error = -ENOENT; 836 if (inode->i_nlink == 0) 837 goto out_gunlock; 838 839 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 840 if (error) 841 goto out_gunlock; 842 843 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 844 switch (error) { 845 case -ENOENT: 846 break; 847 case 0: 848 error = -EEXIST; 849 default: 850 goto out_gunlock; 851 } 852 853 error = -EINVAL; 854 if (!dip->i_inode.i_nlink) 855 goto out_gunlock; 856 error = -EFBIG; 857 if (dip->i_entries == (u32)-1) 858 goto out_gunlock; 859 error = -EPERM; 860 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 861 goto out_gunlock; 862 error = -EINVAL; 863 if (!ip->i_inode.i_nlink) 864 goto out_gunlock; 865 error = -EMLINK; 866 if (ip->i_inode.i_nlink == (u32)-1) 867 goto out_gunlock; 868 869 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 870 if (error < 0) 871 goto out_gunlock; 872 error = 0; 873 874 if (alloc_required) { 875 error = gfs2_quota_lock_check(dip); 876 if (error) 877 goto out_gunlock; 878 879 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); 880 if (error) 881 goto out_gunlock_q; 882 883 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 884 gfs2_rg_blocks(dip, sdp->sd_max_dirres) + 885 2 * RES_DINODE + RES_STATFS + 886 RES_QUOTA, 0); 887 if (error) 888 goto out_ipres; 889 } else { 890 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 891 if (error) 892 goto out_ipres; 893 } 894 895 error = gfs2_meta_inode_buffer(ip, &dibh); 896 if (error) 897 goto out_end_trans; 898 899 error = gfs2_dir_add(dir, &dentry->d_name, ip); 900 if (error) 901 goto out_brelse; 902 903 gfs2_trans_add_meta(ip->i_gl, dibh); 904 inc_nlink(&ip->i_inode); 905 ip->i_inode.i_ctime = CURRENT_TIME; 906 ihold(inode); 907 d_instantiate(dentry, inode); 908 mark_inode_dirty(inode); 909 910 out_brelse: 911 brelse(dibh); 912 out_end_trans: 913 gfs2_trans_end(sdp); 914 out_ipres: 915 if (alloc_required) 916 gfs2_inplace_release(dip); 917 out_gunlock_q: 918 if (alloc_required) 919 gfs2_quota_unlock(dip); 920 out_gunlock: 921 gfs2_glock_dq(ghs + 1); 922 out_child: 923 gfs2_glock_dq(ghs); 924 out_parent: 925 gfs2_holder_uninit(ghs); 926 gfs2_holder_uninit(ghs + 1); 927 return error; 928 } 929 930 /* 931 * gfs2_unlink_ok - check to see that a inode is still in a directory 932 * @dip: the directory 933 * @name: the name of the file 934 * @ip: the inode 935 * 936 * Assumes that the lock on (at least) @dip is held. 937 * 938 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 939 */ 940 941 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 942 const struct gfs2_inode *ip) 943 { 944 int error; 945 946 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 947 return -EPERM; 948 949 if ((dip->i_inode.i_mode & S_ISVTX) && 950 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 951 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 952 return -EPERM; 953 954 if (IS_APPEND(&dip->i_inode)) 955 return -EPERM; 956 957 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 958 if (error) 959 return error; 960 961 error = gfs2_dir_check(&dip->i_inode, name, ip); 962 if (error) 963 return error; 964 965 return 0; 966 } 967 968 /** 969 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 970 * @dip: The parent directory 971 * @name: The name of the entry in the parent directory 972 * @inode: The inode to be removed 973 * 974 * Called with all the locks and in a transaction. This will only be 975 * called for a directory after it has been checked to ensure it is empty. 976 * 977 * Returns: 0 on success, or an error 978 */ 979 980 static int gfs2_unlink_inode(struct gfs2_inode *dip, 981 const struct dentry *dentry) 982 { 983 struct inode *inode = dentry->d_inode; 984 struct gfs2_inode *ip = GFS2_I(inode); 985 int error; 986 987 error = gfs2_dir_del(dip, dentry); 988 if (error) 989 return error; 990 991 ip->i_entries = 0; 992 inode->i_ctime = CURRENT_TIME; 993 if (S_ISDIR(inode->i_mode)) 994 clear_nlink(inode); 995 else 996 drop_nlink(inode); 997 mark_inode_dirty(inode); 998 if (inode->i_nlink == 0) 999 gfs2_unlink_di(inode); 1000 return 0; 1001 } 1002 1003 1004 /** 1005 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1006 * @dir: The inode of the directory containing the inode to unlink 1007 * @dentry: The file itself 1008 * 1009 * This routine uses the type of the inode as a flag to figure out 1010 * whether this is an unlink or an rmdir. 1011 * 1012 * Returns: errno 1013 */ 1014 1015 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1016 { 1017 struct gfs2_inode *dip = GFS2_I(dir); 1018 struct gfs2_sbd *sdp = GFS2_SB(dir); 1019 struct inode *inode = dentry->d_inode; 1020 struct gfs2_inode *ip = GFS2_I(inode); 1021 struct gfs2_holder ghs[3]; 1022 struct gfs2_rgrpd *rgd; 1023 int error; 1024 1025 error = gfs2_rindex_update(sdp); 1026 if (error) 1027 return error; 1028 1029 error = -EROFS; 1030 1031 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1032 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1033 1034 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1035 if (!rgd) 1036 goto out_inodes; 1037 1038 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1039 1040 1041 error = gfs2_glock_nq(ghs); /* parent */ 1042 if (error) 1043 goto out_parent; 1044 1045 error = gfs2_glock_nq(ghs + 1); /* child */ 1046 if (error) 1047 goto out_child; 1048 1049 error = -ENOENT; 1050 if (inode->i_nlink == 0) 1051 goto out_rgrp; 1052 1053 if (S_ISDIR(inode->i_mode)) { 1054 error = -ENOTEMPTY; 1055 if (ip->i_entries > 2 || inode->i_nlink > 2) 1056 goto out_rgrp; 1057 } 1058 1059 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1060 if (error) 1061 goto out_rgrp; 1062 1063 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1064 if (error) 1065 goto out_gunlock; 1066 1067 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1068 if (error) 1069 goto out_end_trans; 1070 1071 error = gfs2_unlink_inode(dip, dentry); 1072 1073 out_end_trans: 1074 gfs2_trans_end(sdp); 1075 out_gunlock: 1076 gfs2_glock_dq(ghs + 2); 1077 out_rgrp: 1078 gfs2_glock_dq(ghs + 1); 1079 out_child: 1080 gfs2_glock_dq(ghs); 1081 out_parent: 1082 gfs2_holder_uninit(ghs + 2); 1083 out_inodes: 1084 gfs2_holder_uninit(ghs + 1); 1085 gfs2_holder_uninit(ghs); 1086 return error; 1087 } 1088 1089 /** 1090 * gfs2_symlink - Create a symlink 1091 * @dir: The directory to create the symlink in 1092 * @dentry: The dentry to put the symlink in 1093 * @symname: The thing which the link points to 1094 * 1095 * Returns: errno 1096 */ 1097 1098 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1099 const char *symname) 1100 { 1101 struct gfs2_sbd *sdp = GFS2_SB(dir); 1102 unsigned int size; 1103 1104 size = strlen(symname); 1105 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1106 return -ENAMETOOLONG; 1107 1108 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1109 } 1110 1111 /** 1112 * gfs2_mkdir - Make a directory 1113 * @dir: The parent directory of the new one 1114 * @dentry: The dentry of the new directory 1115 * @mode: The mode of the new directory 1116 * 1117 * Returns: errno 1118 */ 1119 1120 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1121 { 1122 struct gfs2_sbd *sdp = GFS2_SB(dir); 1123 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1124 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1125 } 1126 1127 /** 1128 * gfs2_mknod - Make a special file 1129 * @dir: The directory in which the special file will reside 1130 * @dentry: The dentry of the special file 1131 * @mode: The mode of the special file 1132 * @dev: The device specification of the special file 1133 * 1134 */ 1135 1136 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1137 dev_t dev) 1138 { 1139 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1140 } 1141 1142 /** 1143 * gfs2_atomic_open - Atomically open a file 1144 * @dir: The directory 1145 * @dentry: The proposed new entry 1146 * @file: The proposed new struct file 1147 * @flags: open flags 1148 * @mode: File mode 1149 * @opened: Flag to say whether the file has been opened or not 1150 * 1151 * Returns: error code or 0 for success 1152 */ 1153 1154 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1155 struct file *file, unsigned flags, 1156 umode_t mode, int *opened) 1157 { 1158 struct dentry *d; 1159 bool excl = !!(flags & O_EXCL); 1160 1161 d = __gfs2_lookup(dir, dentry, file, opened); 1162 if (IS_ERR(d)) 1163 return PTR_ERR(d); 1164 if (d == NULL) 1165 d = dentry; 1166 if (d->d_inode) { 1167 if (!(*opened & FILE_OPENED)) 1168 return finish_no_open(file, d); 1169 return 0; 1170 } 1171 1172 if (!(flags & O_CREAT)) 1173 return -ENOENT; 1174 1175 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1176 } 1177 1178 /* 1179 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1180 * @this: move this 1181 * @to: to here 1182 * 1183 * Follow @to back to the root and make sure we don't encounter @this 1184 * Assumes we already hold the rename lock. 1185 * 1186 * Returns: errno 1187 */ 1188 1189 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1190 { 1191 struct inode *dir = &to->i_inode; 1192 struct super_block *sb = dir->i_sb; 1193 struct inode *tmp; 1194 int error = 0; 1195 1196 igrab(dir); 1197 1198 for (;;) { 1199 if (dir == &this->i_inode) { 1200 error = -EINVAL; 1201 break; 1202 } 1203 if (dir == sb->s_root->d_inode) { 1204 error = 0; 1205 break; 1206 } 1207 1208 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1209 if (IS_ERR(tmp)) { 1210 error = PTR_ERR(tmp); 1211 break; 1212 } 1213 1214 iput(dir); 1215 dir = tmp; 1216 } 1217 1218 iput(dir); 1219 1220 return error; 1221 } 1222 1223 /** 1224 * gfs2_rename - Rename a file 1225 * @odir: Parent directory of old file name 1226 * @odentry: The old dentry of the file 1227 * @ndir: Parent directory of new file name 1228 * @ndentry: The new dentry of the file 1229 * 1230 * Returns: errno 1231 */ 1232 1233 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1234 struct inode *ndir, struct dentry *ndentry) 1235 { 1236 struct gfs2_inode *odip = GFS2_I(odir); 1237 struct gfs2_inode *ndip = GFS2_I(ndir); 1238 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1239 struct gfs2_inode *nip = NULL; 1240 struct gfs2_sbd *sdp = GFS2_SB(odir); 1241 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1242 struct gfs2_rgrpd *nrgd; 1243 unsigned int num_gh; 1244 int dir_rename = 0; 1245 int alloc_required = 0; 1246 unsigned int x; 1247 int error; 1248 1249 if (ndentry->d_inode) { 1250 nip = GFS2_I(ndentry->d_inode); 1251 if (ip == nip) 1252 return 0; 1253 } 1254 1255 error = gfs2_rindex_update(sdp); 1256 if (error) 1257 return error; 1258 1259 error = gfs2_rs_alloc(ndip); 1260 if (error) 1261 return error; 1262 1263 if (odip != ndip) { 1264 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1265 0, &r_gh); 1266 if (error) 1267 goto out; 1268 1269 if (S_ISDIR(ip->i_inode.i_mode)) { 1270 dir_rename = 1; 1271 /* don't move a dirctory into it's subdir */ 1272 error = gfs2_ok_to_move(ip, ndip); 1273 if (error) 1274 goto out_gunlock_r; 1275 } 1276 } 1277 1278 num_gh = 1; 1279 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1280 if (odip != ndip) { 1281 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1282 num_gh++; 1283 } 1284 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1285 num_gh++; 1286 1287 if (nip) { 1288 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1289 num_gh++; 1290 /* grab the resource lock for unlink flag twiddling 1291 * this is the case of the target file already existing 1292 * so we unlink before doing the rename 1293 */ 1294 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1295 if (nrgd) 1296 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1297 } 1298 1299 for (x = 0; x < num_gh; x++) { 1300 error = gfs2_glock_nq(ghs + x); 1301 if (error) 1302 goto out_gunlock; 1303 } 1304 1305 error = -ENOENT; 1306 if (ip->i_inode.i_nlink == 0) 1307 goto out_gunlock; 1308 1309 /* Check out the old directory */ 1310 1311 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1312 if (error) 1313 goto out_gunlock; 1314 1315 /* Check out the new directory */ 1316 1317 if (nip) { 1318 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1319 if (error) 1320 goto out_gunlock; 1321 1322 if (nip->i_inode.i_nlink == 0) { 1323 error = -EAGAIN; 1324 goto out_gunlock; 1325 } 1326 1327 if (S_ISDIR(nip->i_inode.i_mode)) { 1328 if (nip->i_entries < 2) { 1329 gfs2_consist_inode(nip); 1330 error = -EIO; 1331 goto out_gunlock; 1332 } 1333 if (nip->i_entries > 2) { 1334 error = -ENOTEMPTY; 1335 goto out_gunlock; 1336 } 1337 } 1338 } else { 1339 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1340 if (error) 1341 goto out_gunlock; 1342 1343 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1344 switch (error) { 1345 case -ENOENT: 1346 error = 0; 1347 break; 1348 case 0: 1349 error = -EEXIST; 1350 default: 1351 goto out_gunlock; 1352 }; 1353 1354 if (odip != ndip) { 1355 if (!ndip->i_inode.i_nlink) { 1356 error = -ENOENT; 1357 goto out_gunlock; 1358 } 1359 if (ndip->i_entries == (u32)-1) { 1360 error = -EFBIG; 1361 goto out_gunlock; 1362 } 1363 if (S_ISDIR(ip->i_inode.i_mode) && 1364 ndip->i_inode.i_nlink == (u32)-1) { 1365 error = -EMLINK; 1366 goto out_gunlock; 1367 } 1368 } 1369 } 1370 1371 /* Check out the dir to be renamed */ 1372 1373 if (dir_rename) { 1374 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1375 if (error) 1376 goto out_gunlock; 1377 } 1378 1379 if (nip == NULL) 1380 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1381 error = alloc_required; 1382 if (error < 0) 1383 goto out_gunlock; 1384 1385 if (alloc_required) { 1386 error = gfs2_quota_lock_check(ndip); 1387 if (error) 1388 goto out_gunlock; 1389 1390 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0); 1391 if (error) 1392 goto out_gunlock_q; 1393 1394 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1395 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) + 1396 4 * RES_DINODE + 4 * RES_LEAF + 1397 RES_STATFS + RES_QUOTA + 4, 0); 1398 if (error) 1399 goto out_ipreserv; 1400 } else { 1401 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1402 5 * RES_LEAF + 4, 0); 1403 if (error) 1404 goto out_gunlock; 1405 } 1406 1407 /* Remove the target file, if it exists */ 1408 1409 if (nip) 1410 error = gfs2_unlink_inode(ndip, ndentry); 1411 1412 if (dir_rename) { 1413 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1414 if (error) 1415 goto out_end_trans; 1416 } else { 1417 struct buffer_head *dibh; 1418 error = gfs2_meta_inode_buffer(ip, &dibh); 1419 if (error) 1420 goto out_end_trans; 1421 ip->i_inode.i_ctime = CURRENT_TIME; 1422 gfs2_trans_add_meta(ip->i_gl, dibh); 1423 gfs2_dinode_out(ip, dibh->b_data); 1424 brelse(dibh); 1425 } 1426 1427 error = gfs2_dir_del(odip, odentry); 1428 if (error) 1429 goto out_end_trans; 1430 1431 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1432 if (error) 1433 goto out_end_trans; 1434 1435 out_end_trans: 1436 gfs2_trans_end(sdp); 1437 out_ipreserv: 1438 if (alloc_required) 1439 gfs2_inplace_release(ndip); 1440 out_gunlock_q: 1441 if (alloc_required) 1442 gfs2_quota_unlock(ndip); 1443 out_gunlock: 1444 while (x--) { 1445 gfs2_glock_dq(ghs + x); 1446 gfs2_holder_uninit(ghs + x); 1447 } 1448 out_gunlock_r: 1449 if (r_gh.gh_gl) 1450 gfs2_glock_dq_uninit(&r_gh); 1451 out: 1452 return error; 1453 } 1454 1455 /** 1456 * gfs2_follow_link - Follow a symbolic link 1457 * @dentry: The dentry of the link 1458 * @nd: Data that we pass to vfs_follow_link() 1459 * 1460 * This can handle symlinks of any size. 1461 * 1462 * Returns: 0 on success or error code 1463 */ 1464 1465 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1466 { 1467 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1468 struct gfs2_holder i_gh; 1469 struct buffer_head *dibh; 1470 unsigned int size; 1471 char *buf; 1472 int error; 1473 1474 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1475 error = gfs2_glock_nq(&i_gh); 1476 if (error) { 1477 gfs2_holder_uninit(&i_gh); 1478 nd_set_link(nd, ERR_PTR(error)); 1479 return NULL; 1480 } 1481 1482 size = (unsigned int)i_size_read(&ip->i_inode); 1483 if (size == 0) { 1484 gfs2_consist_inode(ip); 1485 buf = ERR_PTR(-EIO); 1486 goto out; 1487 } 1488 1489 error = gfs2_meta_inode_buffer(ip, &dibh); 1490 if (error) { 1491 buf = ERR_PTR(error); 1492 goto out; 1493 } 1494 1495 buf = kzalloc(size + 1, GFP_NOFS); 1496 if (!buf) 1497 buf = ERR_PTR(-ENOMEM); 1498 else 1499 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1500 brelse(dibh); 1501 out: 1502 gfs2_glock_dq_uninit(&i_gh); 1503 nd_set_link(nd, buf); 1504 return NULL; 1505 } 1506 1507 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1508 { 1509 char *s = nd_get_link(nd); 1510 if (!IS_ERR(s)) 1511 kfree(s); 1512 } 1513 1514 /** 1515 * gfs2_permission - 1516 * @inode: The inode 1517 * @mask: The mask to be tested 1518 * @flags: Indicates whether this is an RCU path walk or not 1519 * 1520 * This may be called from the VFS directly, or from within GFS2 with the 1521 * inode locked, so we look to see if the glock is already locked and only 1522 * lock the glock if its not already been done. 1523 * 1524 * Returns: errno 1525 */ 1526 1527 int gfs2_permission(struct inode *inode, int mask) 1528 { 1529 struct gfs2_inode *ip; 1530 struct gfs2_holder i_gh; 1531 int error; 1532 int unlock = 0; 1533 1534 1535 ip = GFS2_I(inode); 1536 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1537 if (mask & MAY_NOT_BLOCK) 1538 return -ECHILD; 1539 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1540 if (error) 1541 return error; 1542 unlock = 1; 1543 } 1544 1545 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1546 error = -EACCES; 1547 else 1548 error = generic_permission(inode, mask); 1549 if (unlock) 1550 gfs2_glock_dq_uninit(&i_gh); 1551 1552 return error; 1553 } 1554 1555 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1556 { 1557 setattr_copy(inode, attr); 1558 mark_inode_dirty(inode); 1559 return 0; 1560 } 1561 1562 /** 1563 * gfs2_setattr_simple - 1564 * @ip: 1565 * @attr: 1566 * 1567 * Returns: errno 1568 */ 1569 1570 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1571 { 1572 int error; 1573 1574 if (current->journal_info) 1575 return __gfs2_setattr_simple(inode, attr); 1576 1577 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1578 if (error) 1579 return error; 1580 1581 error = __gfs2_setattr_simple(inode, attr); 1582 gfs2_trans_end(GFS2_SB(inode)); 1583 return error; 1584 } 1585 1586 static int setattr_chown(struct inode *inode, struct iattr *attr) 1587 { 1588 struct gfs2_inode *ip = GFS2_I(inode); 1589 struct gfs2_sbd *sdp = GFS2_SB(inode); 1590 kuid_t ouid, nuid; 1591 kgid_t ogid, ngid; 1592 int error; 1593 1594 ouid = inode->i_uid; 1595 ogid = inode->i_gid; 1596 nuid = attr->ia_uid; 1597 ngid = attr->ia_gid; 1598 1599 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1600 ouid = nuid = NO_UID_QUOTA_CHANGE; 1601 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1602 ogid = ngid = NO_GID_QUOTA_CHANGE; 1603 1604 error = gfs2_quota_lock(ip, nuid, ngid); 1605 if (error) 1606 return error; 1607 1608 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1609 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1610 error = gfs2_quota_check(ip, nuid, ngid); 1611 if (error) 1612 goto out_gunlock_q; 1613 } 1614 1615 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1616 if (error) 1617 goto out_gunlock_q; 1618 1619 error = gfs2_setattr_simple(inode, attr); 1620 if (error) 1621 goto out_end_trans; 1622 1623 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1624 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1625 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1626 gfs2_quota_change(ip, -blocks, ouid, ogid); 1627 gfs2_quota_change(ip, blocks, nuid, ngid); 1628 } 1629 1630 out_end_trans: 1631 gfs2_trans_end(sdp); 1632 out_gunlock_q: 1633 gfs2_quota_unlock(ip); 1634 return error; 1635 } 1636 1637 /** 1638 * gfs2_setattr - Change attributes on an inode 1639 * @dentry: The dentry which is changing 1640 * @attr: The structure describing the change 1641 * 1642 * The VFS layer wants to change one or more of an inodes attributes. Write 1643 * that change out to disk. 1644 * 1645 * Returns: errno 1646 */ 1647 1648 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1649 { 1650 struct inode *inode = dentry->d_inode; 1651 struct gfs2_inode *ip = GFS2_I(inode); 1652 struct gfs2_holder i_gh; 1653 int error; 1654 1655 error = gfs2_rs_alloc(ip); 1656 if (error) 1657 return error; 1658 1659 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1660 if (error) 1661 return error; 1662 1663 error = -EPERM; 1664 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1665 goto out; 1666 1667 error = inode_change_ok(inode, attr); 1668 if (error) 1669 goto out; 1670 1671 if (attr->ia_valid & ATTR_SIZE) 1672 error = gfs2_setattr_size(inode, attr->ia_size); 1673 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1674 error = setattr_chown(inode, attr); 1675 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1676 error = gfs2_acl_chmod(ip, attr); 1677 else 1678 error = gfs2_setattr_simple(inode, attr); 1679 1680 out: 1681 if (!error) 1682 mark_inode_dirty(inode); 1683 gfs2_glock_dq_uninit(&i_gh); 1684 return error; 1685 } 1686 1687 /** 1688 * gfs2_getattr - Read out an inode's attributes 1689 * @mnt: The vfsmount the inode is being accessed from 1690 * @dentry: The dentry to stat 1691 * @stat: The inode's stats 1692 * 1693 * This may be called from the VFS directly, or from within GFS2 with the 1694 * inode locked, so we look to see if the glock is already locked and only 1695 * lock the glock if its not already been done. Note that its the NFS 1696 * readdirplus operation which causes this to be called (from filldir) 1697 * with the glock already held. 1698 * 1699 * Returns: errno 1700 */ 1701 1702 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1703 struct kstat *stat) 1704 { 1705 struct inode *inode = dentry->d_inode; 1706 struct gfs2_inode *ip = GFS2_I(inode); 1707 struct gfs2_holder gh; 1708 int error; 1709 int unlock = 0; 1710 1711 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1712 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1713 if (error) 1714 return error; 1715 unlock = 1; 1716 } 1717 1718 generic_fillattr(inode, stat); 1719 if (unlock) 1720 gfs2_glock_dq_uninit(&gh); 1721 1722 return 0; 1723 } 1724 1725 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1726 const void *data, size_t size, int flags) 1727 { 1728 struct inode *inode = dentry->d_inode; 1729 struct gfs2_inode *ip = GFS2_I(inode); 1730 struct gfs2_holder gh; 1731 int ret; 1732 1733 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1734 ret = gfs2_glock_nq(&gh); 1735 if (ret == 0) { 1736 ret = gfs2_rs_alloc(ip); 1737 if (ret == 0) 1738 ret = generic_setxattr(dentry, name, data, size, flags); 1739 gfs2_glock_dq(&gh); 1740 } 1741 gfs2_holder_uninit(&gh); 1742 return ret; 1743 } 1744 1745 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1746 void *data, size_t size) 1747 { 1748 struct inode *inode = dentry->d_inode; 1749 struct gfs2_inode *ip = GFS2_I(inode); 1750 struct gfs2_holder gh; 1751 int ret; 1752 1753 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1754 ret = gfs2_glock_nq(&gh); 1755 if (ret == 0) { 1756 ret = generic_getxattr(dentry, name, data, size); 1757 gfs2_glock_dq(&gh); 1758 } 1759 gfs2_holder_uninit(&gh); 1760 return ret; 1761 } 1762 1763 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1764 { 1765 struct inode *inode = dentry->d_inode; 1766 struct gfs2_inode *ip = GFS2_I(inode); 1767 struct gfs2_holder gh; 1768 int ret; 1769 1770 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1771 ret = gfs2_glock_nq(&gh); 1772 if (ret == 0) { 1773 ret = gfs2_rs_alloc(ip); 1774 if (ret == 0) 1775 ret = generic_removexattr(dentry, name); 1776 gfs2_glock_dq(&gh); 1777 } 1778 gfs2_holder_uninit(&gh); 1779 return ret; 1780 } 1781 1782 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1783 u64 start, u64 len) 1784 { 1785 struct gfs2_inode *ip = GFS2_I(inode); 1786 struct gfs2_holder gh; 1787 int ret; 1788 1789 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1790 if (ret) 1791 return ret; 1792 1793 mutex_lock(&inode->i_mutex); 1794 1795 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1796 if (ret) 1797 goto out; 1798 1799 if (gfs2_is_stuffed(ip)) { 1800 u64 phys = ip->i_no_addr << inode->i_blkbits; 1801 u64 size = i_size_read(inode); 1802 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1803 FIEMAP_EXTENT_DATA_INLINE; 1804 phys += sizeof(struct gfs2_dinode); 1805 phys += start; 1806 if (start + len > size) 1807 len = size - start; 1808 if (start < size) 1809 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1810 len, flags); 1811 if (ret == 1) 1812 ret = 0; 1813 } else { 1814 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1815 gfs2_block_map); 1816 } 1817 1818 gfs2_glock_dq_uninit(&gh); 1819 out: 1820 mutex_unlock(&inode->i_mutex); 1821 return ret; 1822 } 1823 1824 const struct inode_operations gfs2_file_iops = { 1825 .permission = gfs2_permission, 1826 .setattr = gfs2_setattr, 1827 .getattr = gfs2_getattr, 1828 .setxattr = gfs2_setxattr, 1829 .getxattr = gfs2_getxattr, 1830 .listxattr = gfs2_listxattr, 1831 .removexattr = gfs2_removexattr, 1832 .fiemap = gfs2_fiemap, 1833 .get_acl = gfs2_get_acl, 1834 }; 1835 1836 const struct inode_operations gfs2_dir_iops = { 1837 .create = gfs2_create, 1838 .lookup = gfs2_lookup, 1839 .link = gfs2_link, 1840 .unlink = gfs2_unlink, 1841 .symlink = gfs2_symlink, 1842 .mkdir = gfs2_mkdir, 1843 .rmdir = gfs2_unlink, 1844 .mknod = gfs2_mknod, 1845 .rename = gfs2_rename, 1846 .permission = gfs2_permission, 1847 .setattr = gfs2_setattr, 1848 .getattr = gfs2_getattr, 1849 .setxattr = gfs2_setxattr, 1850 .getxattr = gfs2_getxattr, 1851 .listxattr = gfs2_listxattr, 1852 .removexattr = gfs2_removexattr, 1853 .fiemap = gfs2_fiemap, 1854 .get_acl = gfs2_get_acl, 1855 .atomic_open = gfs2_atomic_open, 1856 }; 1857 1858 const struct inode_operations gfs2_symlink_iops = { 1859 .readlink = generic_readlink, 1860 .follow_link = gfs2_follow_link, 1861 .put_link = gfs2_put_link, 1862 .permission = gfs2_permission, 1863 .setattr = gfs2_setattr, 1864 .getattr = gfs2_getattr, 1865 .setxattr = gfs2_setxattr, 1866 .getxattr = gfs2_getxattr, 1867 .listxattr = gfs2_listxattr, 1868 .removexattr = gfs2_removexattr, 1869 .fiemap = gfs2_fiemap, 1870 .get_acl = gfs2_get_acl, 1871 }; 1872 1873