1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 5 */ 6 7 #include <linux/slab.h> 8 #include <linux/spinlock.h> 9 #include <linux/completion.h> 10 #include <linux/buffer_head.h> 11 #include <linux/namei.h> 12 #include <linux/mm.h> 13 #include <linux/cred.h> 14 #include <linux/xattr.h> 15 #include <linux/posix_acl.h> 16 #include <linux/gfs2_ondisk.h> 17 #include <linux/crc32.h> 18 #include <linux/iomap.h> 19 #include <linux/security.h> 20 #include <linux/fiemap.h> 21 #include <linux/uaccess.h> 22 23 #include "gfs2.h" 24 #include "incore.h" 25 #include "acl.h" 26 #include "bmap.h" 27 #include "dir.h" 28 #include "xattr.h" 29 #include "glock.h" 30 #include "inode.h" 31 #include "meta_io.h" 32 #include "quota.h" 33 #include "rgrp.h" 34 #include "trans.h" 35 #include "util.h" 36 #include "super.h" 37 #include "glops.h" 38 39 static int iget_test(struct inode *inode, void *opaque) 40 { 41 u64 no_addr = *(u64 *)opaque; 42 43 return GFS2_I(inode)->i_no_addr == no_addr; 44 } 45 46 static int iget_set(struct inode *inode, void *opaque) 47 { 48 u64 no_addr = *(u64 *)opaque; 49 50 GFS2_I(inode)->i_no_addr = no_addr; 51 inode->i_ino = no_addr; 52 return 0; 53 } 54 55 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) 56 { 57 struct inode *inode; 58 59 repeat: 60 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr); 61 if (!inode) 62 return inode; 63 if (is_bad_inode(inode)) { 64 iput(inode); 65 goto repeat; 66 } 67 return inode; 68 } 69 70 /** 71 * gfs2_set_iop - Sets inode operations 72 * @inode: The inode with correct i_mode filled in 73 * 74 * GFS2 lookup code fills in vfs inode contents based on info obtained 75 * from directory entry inside gfs2_inode_lookup(). 76 */ 77 78 static void gfs2_set_iop(struct inode *inode) 79 { 80 struct gfs2_sbd *sdp = GFS2_SB(inode); 81 umode_t mode = inode->i_mode; 82 83 if (S_ISREG(mode)) { 84 inode->i_op = &gfs2_file_iops; 85 if (gfs2_localflocks(sdp)) 86 inode->i_fop = &gfs2_file_fops_nolock; 87 else 88 inode->i_fop = &gfs2_file_fops; 89 } else if (S_ISDIR(mode)) { 90 inode->i_op = &gfs2_dir_iops; 91 if (gfs2_localflocks(sdp)) 92 inode->i_fop = &gfs2_dir_fops_nolock; 93 else 94 inode->i_fop = &gfs2_dir_fops; 95 } else if (S_ISLNK(mode)) { 96 inode->i_op = &gfs2_symlink_iops; 97 } else { 98 inode->i_op = &gfs2_file_iops; 99 init_special_inode(inode, inode->i_mode, inode->i_rdev); 100 } 101 } 102 103 /** 104 * gfs2_inode_lookup - Lookup an inode 105 * @sb: The super block 106 * @type: The type of the inode 107 * @no_addr: The inode number 108 * @no_formal_ino: The inode generation number 109 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; 110 * GFS2_BLKST_FREE to indicate not to verify) 111 * 112 * If @type is DT_UNKNOWN, the inode type is fetched from disk. 113 * 114 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a 115 * placeholder because it doesn't otherwise make sense), the on-disk block type 116 * is verified to be @blktype. 117 * 118 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE) 119 * if it detects that @no_formal_ino doesn't match the actual inode generation 120 * number. However, it doesn't always know unless @type is DT_UNKNOWN. 121 * 122 * Returns: A VFS inode, or an error 123 */ 124 125 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 126 u64 no_addr, u64 no_formal_ino, 127 unsigned int blktype) 128 { 129 struct inode *inode; 130 struct gfs2_inode *ip; 131 struct gfs2_glock *io_gl = NULL; 132 struct gfs2_holder i_gh; 133 int error; 134 135 gfs2_holder_mark_uninitialized(&i_gh); 136 inode = gfs2_iget(sb, no_addr); 137 if (!inode) 138 return ERR_PTR(-ENOMEM); 139 140 ip = GFS2_I(inode); 141 142 if (inode->i_state & I_NEW) { 143 struct gfs2_sbd *sdp = GFS2_SB(inode); 144 145 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 146 if (unlikely(error)) 147 goto fail; 148 flush_delayed_work(&ip->i_gl->gl_work); 149 150 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 151 if (unlikely(error)) 152 goto fail; 153 154 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { 155 /* 156 * The GL_SKIP flag indicates to skip reading the inode 157 * block. We read the inode with gfs2_inode_refresh 158 * after possibly checking the block type. 159 */ 160 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 161 GL_SKIP, &i_gh); 162 if (error) 163 goto fail; 164 165 error = -ESTALE; 166 if (no_formal_ino && 167 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) 168 goto fail; 169 170 if (blktype != GFS2_BLKST_FREE) { 171 error = gfs2_check_blk_type(sdp, no_addr, 172 blktype); 173 if (error) 174 goto fail; 175 } 176 } 177 178 glock_set_object(ip->i_gl, ip); 179 set_bit(GIF_INVALID, &ip->i_flags); 180 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 181 if (unlikely(error)) 182 goto fail; 183 gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl); 184 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 185 gfs2_glock_put(io_gl); 186 io_gl = NULL; 187 188 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ 189 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); 190 inode->i_atime.tv_nsec = 0; 191 192 if (type == DT_UNKNOWN) { 193 /* Inode glock must be locked already */ 194 error = gfs2_inode_refresh(GFS2_I(inode)); 195 if (error) 196 goto fail; 197 } else { 198 ip->i_no_formal_ino = no_formal_ino; 199 inode->i_mode = DT2IF(type); 200 } 201 202 if (gfs2_holder_initialized(&i_gh)) 203 gfs2_glock_dq_uninit(&i_gh); 204 205 gfs2_set_iop(inode); 206 } 207 208 if (no_formal_ino && ip->i_no_formal_ino && 209 no_formal_ino != ip->i_no_formal_ino) { 210 error = -ESTALE; 211 if (inode->i_state & I_NEW) 212 goto fail; 213 iput(inode); 214 return ERR_PTR(error); 215 } 216 217 if (inode->i_state & I_NEW) 218 unlock_new_inode(inode); 219 220 return inode; 221 222 fail: 223 if (io_gl) 224 gfs2_glock_put(io_gl); 225 if (gfs2_holder_initialized(&i_gh)) 226 gfs2_glock_dq_uninit(&i_gh); 227 iget_failed(inode); 228 return ERR_PTR(error); 229 } 230 231 /** 232 * gfs2_lookup_by_inum - look up an inode by inode number 233 * @sdp: The super block 234 * @no_addr: The inode number 235 * @no_formal_ino: The inode generation number (0 for any) 236 * @blktype: Requested block type (see gfs2_inode_lookup) 237 */ 238 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 239 u64 no_formal_ino, unsigned int blktype) 240 { 241 struct super_block *sb = sdp->sd_vfs; 242 struct inode *inode; 243 int error; 244 245 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 246 blktype); 247 if (IS_ERR(inode)) 248 return inode; 249 250 if (no_formal_ino) { 251 error = -EIO; 252 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 253 goto fail_iput; 254 } 255 return inode; 256 257 fail_iput: 258 iput(inode); 259 return ERR_PTR(error); 260 } 261 262 263 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 264 { 265 struct qstr qstr; 266 struct inode *inode; 267 gfs2_str2qstr(&qstr, name); 268 inode = gfs2_lookupi(dip, &qstr, 1); 269 /* gfs2_lookupi has inconsistent callers: vfs 270 * related routines expect NULL for no entry found, 271 * gfs2_lookup_simple callers expect ENOENT 272 * and do not check for NULL. 273 */ 274 if (inode == NULL) 275 return ERR_PTR(-ENOENT); 276 else 277 return inode; 278 } 279 280 281 /** 282 * gfs2_lookupi - Look up a filename in a directory and return its inode 283 * @d_gh: An initialized holder for the directory glock 284 * @name: The name of the inode to look for 285 * @is_root: If 1, ignore the caller's permissions 286 * @i_gh: An uninitialized holder for the new inode glock 287 * 288 * This can be called via the VFS filldir function when NFS is doing 289 * a readdirplus and the inode which its intending to stat isn't 290 * already in cache. In this case we must not take the directory glock 291 * again, since the readdir call will have already taken that lock. 292 * 293 * Returns: errno 294 */ 295 296 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 297 int is_root) 298 { 299 struct super_block *sb = dir->i_sb; 300 struct gfs2_inode *dip = GFS2_I(dir); 301 struct gfs2_holder d_gh; 302 int error = 0; 303 struct inode *inode = NULL; 304 305 gfs2_holder_mark_uninitialized(&d_gh); 306 if (!name->len || name->len > GFS2_FNAMESIZE) 307 return ERR_PTR(-ENAMETOOLONG); 308 309 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 310 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 311 dir == d_inode(sb->s_root))) { 312 igrab(dir); 313 return dir; 314 } 315 316 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 317 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 318 if (error) 319 return ERR_PTR(error); 320 } 321 322 if (!is_root) { 323 error = gfs2_permission(dir, MAY_EXEC); 324 if (error) 325 goto out; 326 } 327 328 inode = gfs2_dir_search(dir, name, false); 329 if (IS_ERR(inode)) 330 error = PTR_ERR(inode); 331 out: 332 if (gfs2_holder_initialized(&d_gh)) 333 gfs2_glock_dq_uninit(&d_gh); 334 if (error == -ENOENT) 335 return NULL; 336 return inode ? inode : ERR_PTR(error); 337 } 338 339 /** 340 * create_ok - OK to create a new on-disk inode here? 341 * @dip: Directory in which dinode is to be created 342 * @name: Name of new dinode 343 * @mode: 344 * 345 * Returns: errno 346 */ 347 348 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 349 umode_t mode) 350 { 351 int error; 352 353 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 354 if (error) 355 return error; 356 357 /* Don't create entries in an unlinked directory */ 358 if (!dip->i_inode.i_nlink) 359 return -ENOENT; 360 361 if (dip->i_entries == (u32)-1) 362 return -EFBIG; 363 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 364 return -EMLINK; 365 366 return 0; 367 } 368 369 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 370 struct inode *inode) 371 { 372 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 373 (dip->i_inode.i_mode & S_ISUID) && 374 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 375 if (S_ISDIR(inode->i_mode)) 376 inode->i_mode |= S_ISUID; 377 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 378 inode->i_mode &= ~07111; 379 inode->i_uid = dip->i_inode.i_uid; 380 } else 381 inode->i_uid = current_fsuid(); 382 383 if (dip->i_inode.i_mode & S_ISGID) { 384 if (S_ISDIR(inode->i_mode)) 385 inode->i_mode |= S_ISGID; 386 inode->i_gid = dip->i_inode.i_gid; 387 } else 388 inode->i_gid = current_fsgid(); 389 } 390 391 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 392 { 393 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 394 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 395 int error; 396 397 error = gfs2_quota_lock_check(ip, &ap); 398 if (error) 399 goto out; 400 401 error = gfs2_inplace_reserve(ip, &ap); 402 if (error) 403 goto out_quota; 404 405 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 406 if (error) 407 goto out_ipreserv; 408 409 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); 410 ip->i_no_formal_ino = ip->i_generation; 411 ip->i_inode.i_ino = ip->i_no_addr; 412 ip->i_goal = ip->i_no_addr; 413 414 gfs2_trans_end(sdp); 415 416 out_ipreserv: 417 gfs2_inplace_release(ip); 418 out_quota: 419 gfs2_quota_unlock(ip); 420 out: 421 return error; 422 } 423 424 static void gfs2_init_dir(struct buffer_head *dibh, 425 const struct gfs2_inode *parent) 426 { 427 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 428 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 429 430 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 431 dent->de_inum = di->di_num; /* already GFS2 endian */ 432 dent->de_type = cpu_to_be16(DT_DIR); 433 434 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 435 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 436 gfs2_inum_out(parent, dent); 437 dent->de_type = cpu_to_be16(DT_DIR); 438 439 } 440 441 /** 442 * gfs2_init_xattr - Initialise an xattr block for a new inode 443 * @ip: The inode in question 444 * 445 * This sets up an empty xattr block for a new inode, ready to 446 * take any ACLs, LSM xattrs, etc. 447 */ 448 449 static void gfs2_init_xattr(struct gfs2_inode *ip) 450 { 451 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 452 struct buffer_head *bh; 453 struct gfs2_ea_header *ea; 454 455 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 456 gfs2_trans_add_meta(ip->i_gl, bh); 457 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 458 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 459 460 ea = GFS2_EA_BH2FIRST(bh); 461 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 462 ea->ea_type = GFS2_EATYPE_UNUSED; 463 ea->ea_flags = GFS2_EAFLAG_LAST; 464 465 brelse(bh); 466 } 467 468 /** 469 * init_dinode - Fill in a new dinode structure 470 * @dip: The directory this inode is being created in 471 * @ip: The inode 472 * @symname: The symlink destination (if a symlink) 473 * @bhp: The buffer head (returned to caller) 474 * 475 */ 476 477 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 478 const char *symname) 479 { 480 struct gfs2_dinode *di; 481 struct buffer_head *dibh; 482 483 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 484 gfs2_trans_add_meta(ip->i_gl, dibh); 485 di = (struct gfs2_dinode *)dibh->b_data; 486 gfs2_dinode_out(ip, di); 487 488 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 489 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 490 di->__pad1 = 0; 491 di->__pad2 = 0; 492 di->__pad3 = 0; 493 memset(&di->__pad4, 0, sizeof(di->__pad4)); 494 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 495 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 496 497 switch(ip->i_inode.i_mode & S_IFMT) { 498 case S_IFDIR: 499 gfs2_init_dir(dibh, dip); 500 break; 501 case S_IFLNK: 502 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 503 break; 504 } 505 506 set_buffer_uptodate(dibh); 507 brelse(dibh); 508 } 509 510 /** 511 * gfs2_trans_da_blocks - Calculate number of blocks to link inode 512 * @dip: The directory we are linking into 513 * @da: The dir add information 514 * @nr_inodes: The number of inodes involved 515 * 516 * This calculate the number of blocks we need to reserve in a 517 * transaction to link @nr_inodes into a directory. In most cases 518 * @nr_inodes will be 2 (the directory plus the inode being linked in) 519 * but in case of rename, 4 may be required. 520 * 521 * Returns: Number of blocks 522 */ 523 524 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 525 const struct gfs2_diradd *da, 526 unsigned nr_inodes) 527 { 528 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 529 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 530 } 531 532 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 533 struct gfs2_inode *ip, struct gfs2_diradd *da) 534 { 535 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 536 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 537 int error; 538 539 if (da->nr_blocks) { 540 error = gfs2_quota_lock_check(dip, &ap); 541 if (error) 542 goto fail_quota_locks; 543 544 error = gfs2_inplace_reserve(dip, &ap); 545 if (error) 546 goto fail_quota_locks; 547 548 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 549 if (error) 550 goto fail_ipreserv; 551 } else { 552 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 553 if (error) 554 goto fail_quota_locks; 555 } 556 557 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 558 559 gfs2_trans_end(sdp); 560 fail_ipreserv: 561 gfs2_inplace_release(dip); 562 fail_quota_locks: 563 gfs2_quota_unlock(dip); 564 return error; 565 } 566 567 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 568 void *fs_info) 569 { 570 const struct xattr *xattr; 571 int err = 0; 572 573 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 574 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 575 xattr->value_len, 0, 576 GFS2_EATYPE_SECURITY); 577 if (err < 0) 578 break; 579 } 580 return err; 581 } 582 583 /** 584 * gfs2_create_inode - Create a new inode 585 * @dir: The parent directory 586 * @dentry: The new dentry 587 * @file: If non-NULL, the file which is being opened 588 * @mode: The permissions on the new inode 589 * @dev: For device nodes, this is the device number 590 * @symname: For symlinks, this is the link destination 591 * @size: The initial size of the inode (ignored for directories) 592 * 593 * Returns: 0 on success, or error code 594 */ 595 596 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 597 struct file *file, 598 umode_t mode, dev_t dev, const char *symname, 599 unsigned int size, int excl) 600 { 601 const struct qstr *name = &dentry->d_name; 602 struct posix_acl *default_acl, *acl; 603 struct gfs2_holder ghs[2]; 604 struct inode *inode = NULL; 605 struct gfs2_inode *dip = GFS2_I(dir), *ip; 606 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 607 struct gfs2_glock *io_gl = NULL; 608 int error, free_vfs_inode = 1; 609 u32 aflags = 0; 610 unsigned blocks = 1; 611 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 612 613 if (!name->len || name->len > GFS2_FNAMESIZE) 614 return -ENAMETOOLONG; 615 616 error = gfs2_qa_get(dip); 617 if (error) 618 return error; 619 620 error = gfs2_rindex_update(sdp); 621 if (error) 622 goto fail; 623 624 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 625 if (error) 626 goto fail; 627 gfs2_holder_mark_uninitialized(ghs + 1); 628 629 error = create_ok(dip, name, mode); 630 if (error) 631 goto fail_gunlock; 632 633 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 634 error = PTR_ERR(inode); 635 if (!IS_ERR(inode)) { 636 if (S_ISDIR(inode->i_mode)) { 637 iput(inode); 638 inode = ERR_PTR(-EISDIR); 639 goto fail_gunlock; 640 } 641 d_instantiate(dentry, inode); 642 error = 0; 643 if (file) { 644 if (S_ISREG(inode->i_mode)) 645 error = finish_open(file, dentry, gfs2_open_common); 646 else 647 error = finish_no_open(file, NULL); 648 } 649 gfs2_glock_dq_uninit(ghs); 650 goto fail; 651 } else if (error != -ENOENT) { 652 goto fail_gunlock; 653 } 654 655 error = gfs2_diradd_alloc_required(dir, name, &da); 656 if (error < 0) 657 goto fail_gunlock; 658 659 inode = new_inode(sdp->sd_vfs); 660 error = -ENOMEM; 661 if (!inode) 662 goto fail_gunlock; 663 664 error = posix_acl_create(dir, &mode, &default_acl, &acl); 665 if (error) 666 goto fail_gunlock; 667 668 ip = GFS2_I(inode); 669 error = gfs2_qa_get(ip); 670 if (error) 671 goto fail_free_acls; 672 673 inode->i_mode = mode; 674 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 675 inode->i_rdev = dev; 676 inode->i_size = size; 677 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 678 munge_mode_uid_gid(dip, inode); 679 check_and_update_goal(dip); 680 ip->i_goal = dip->i_goal; 681 ip->i_diskflags = 0; 682 ip->i_eattr = 0; 683 ip->i_height = 0; 684 ip->i_depth = 0; 685 ip->i_entries = 0; 686 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 687 688 switch(mode & S_IFMT) { 689 case S_IFREG: 690 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 691 gfs2_tune_get(sdp, gt_new_files_jdata)) 692 ip->i_diskflags |= GFS2_DIF_JDATA; 693 gfs2_set_aops(inode); 694 break; 695 case S_IFDIR: 696 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 697 ip->i_diskflags |= GFS2_DIF_JDATA; 698 ip->i_entries = 2; 699 break; 700 } 701 702 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 703 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 704 ip->i_diskflags |= GFS2_DIF_SYSTEM; 705 706 gfs2_set_inode_flags(inode); 707 708 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 709 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 710 aflags |= GFS2_AF_ORLOV; 711 712 if (default_acl || acl) 713 blocks++; 714 715 error = alloc_dinode(ip, aflags, &blocks); 716 if (error) 717 goto fail_free_inode; 718 719 gfs2_set_inode_blocks(inode, blocks); 720 721 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 722 if (error) 723 goto fail_free_inode; 724 flush_delayed_work(&ip->i_gl->gl_work); 725 glock_set_object(ip->i_gl, ip); 726 727 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 728 if (error) 729 goto fail_free_inode; 730 731 error = gfs2_trans_begin(sdp, blocks, 0); 732 if (error) 733 goto fail_free_inode; 734 735 if (blocks > 1) { 736 ip->i_eattr = ip->i_no_addr + 1; 737 gfs2_init_xattr(ip); 738 } 739 init_dinode(dip, ip, symname); 740 gfs2_trans_end(sdp); 741 742 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 743 if (error) 744 goto fail_free_inode; 745 746 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags)); 747 748 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 749 if (error) 750 goto fail_gunlock2; 751 752 gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl); 753 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 754 gfs2_set_iop(inode); 755 insert_inode_hash(inode); 756 757 free_vfs_inode = 0; /* After this point, the inode is no longer 758 considered free. Any failures need to undo 759 the gfs2 structures. */ 760 if (default_acl) { 761 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 762 if (error) 763 goto fail_gunlock3; 764 posix_acl_release(default_acl); 765 default_acl = NULL; 766 } 767 if (acl) { 768 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 769 if (error) 770 goto fail_gunlock3; 771 posix_acl_release(acl); 772 acl = NULL; 773 } 774 775 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 776 &gfs2_initxattrs, NULL); 777 if (error) 778 goto fail_gunlock3; 779 780 error = link_dinode(dip, name, ip, &da); 781 if (error) 782 goto fail_gunlock3; 783 784 mark_inode_dirty(inode); 785 d_instantiate(dentry, inode); 786 /* After instantiate, errors should result in evict which will destroy 787 * both inode and iopen glocks properly. */ 788 if (file) { 789 file->f_mode |= FMODE_CREATED; 790 error = finish_open(file, dentry, gfs2_open_common); 791 } 792 gfs2_glock_dq_uninit(ghs); 793 gfs2_qa_put(ip); 794 gfs2_glock_dq_uninit(ghs + 1); 795 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags); 796 gfs2_glock_put(io_gl); 797 gfs2_qa_put(dip); 798 return error; 799 800 fail_gunlock3: 801 glock_clear_object(io_gl, ip); 802 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 803 fail_gunlock2: 804 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags); 805 gfs2_glock_put(io_gl); 806 fail_free_inode: 807 if (ip->i_gl) { 808 glock_clear_object(ip->i_gl, ip); 809 if (free_vfs_inode) /* else evict will do the put for us */ 810 gfs2_glock_put(ip->i_gl); 811 } 812 gfs2_rs_delete(ip, NULL); 813 gfs2_qa_put(ip); 814 fail_free_acls: 815 posix_acl_release(default_acl); 816 posix_acl_release(acl); 817 fail_gunlock: 818 gfs2_dir_no_add(&da); 819 gfs2_glock_dq_uninit(ghs); 820 if (!IS_ERR_OR_NULL(inode)) { 821 clear_nlink(inode); 822 if (!free_vfs_inode) 823 mark_inode_dirty(inode); 824 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 825 &GFS2_I(inode)->i_flags); 826 iput(inode); 827 } 828 if (gfs2_holder_initialized(ghs + 1)) 829 gfs2_glock_dq_uninit(ghs + 1); 830 fail: 831 gfs2_qa_put(dip); 832 return error; 833 } 834 835 /** 836 * gfs2_create - Create a file 837 * @dir: The directory in which to create the file 838 * @dentry: The dentry of the new file 839 * @mode: The mode of the new file 840 * 841 * Returns: errno 842 */ 843 844 static int gfs2_create(struct inode *dir, struct dentry *dentry, 845 umode_t mode, bool excl) 846 { 847 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 848 } 849 850 /** 851 * __gfs2_lookup - Look up a filename in a directory and return its inode 852 * @dir: The directory inode 853 * @dentry: The dentry of the new inode 854 * @file: File to be opened 855 * 856 * 857 * Returns: errno 858 */ 859 860 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 861 struct file *file) 862 { 863 struct inode *inode; 864 struct dentry *d; 865 struct gfs2_holder gh; 866 struct gfs2_glock *gl; 867 int error; 868 869 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 870 if (inode == NULL) { 871 d_add(dentry, NULL); 872 return NULL; 873 } 874 if (IS_ERR(inode)) 875 return ERR_CAST(inode); 876 877 gl = GFS2_I(inode)->i_gl; 878 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 879 if (error) { 880 iput(inode); 881 return ERR_PTR(error); 882 } 883 884 d = d_splice_alias(inode, dentry); 885 if (IS_ERR(d)) { 886 gfs2_glock_dq_uninit(&gh); 887 return d; 888 } 889 if (file && S_ISREG(inode->i_mode)) 890 error = finish_open(file, dentry, gfs2_open_common); 891 892 gfs2_glock_dq_uninit(&gh); 893 if (error) { 894 dput(d); 895 return ERR_PTR(error); 896 } 897 return d; 898 } 899 900 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 901 unsigned flags) 902 { 903 return __gfs2_lookup(dir, dentry, NULL); 904 } 905 906 /** 907 * gfs2_link - Link to a file 908 * @old_dentry: The inode to link 909 * @dir: Add link to this directory 910 * @dentry: The name of the link 911 * 912 * Link the inode in "old_dentry" into the directory "dir" with the 913 * name in "dentry". 914 * 915 * Returns: errno 916 */ 917 918 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 919 struct dentry *dentry) 920 { 921 struct gfs2_inode *dip = GFS2_I(dir); 922 struct gfs2_sbd *sdp = GFS2_SB(dir); 923 struct inode *inode = d_inode(old_dentry); 924 struct gfs2_inode *ip = GFS2_I(inode); 925 struct gfs2_holder ghs[2]; 926 struct buffer_head *dibh; 927 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 928 int error; 929 930 if (S_ISDIR(inode->i_mode)) 931 return -EPERM; 932 933 error = gfs2_qa_get(dip); 934 if (error) 935 return error; 936 937 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 938 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 939 940 error = gfs2_glock_nq(ghs); /* parent */ 941 if (error) 942 goto out_parent; 943 944 error = gfs2_glock_nq(ghs + 1); /* child */ 945 if (error) 946 goto out_child; 947 948 error = -ENOENT; 949 if (inode->i_nlink == 0) 950 goto out_gunlock; 951 952 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 953 if (error) 954 goto out_gunlock; 955 956 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 957 switch (error) { 958 case -ENOENT: 959 break; 960 case 0: 961 error = -EEXIST; 962 default: 963 goto out_gunlock; 964 } 965 966 error = -EINVAL; 967 if (!dip->i_inode.i_nlink) 968 goto out_gunlock; 969 error = -EFBIG; 970 if (dip->i_entries == (u32)-1) 971 goto out_gunlock; 972 error = -EPERM; 973 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 974 goto out_gunlock; 975 error = -EINVAL; 976 if (!ip->i_inode.i_nlink) 977 goto out_gunlock; 978 error = -EMLINK; 979 if (ip->i_inode.i_nlink == (u32)-1) 980 goto out_gunlock; 981 982 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 983 if (error < 0) 984 goto out_gunlock; 985 986 if (da.nr_blocks) { 987 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 988 error = gfs2_quota_lock_check(dip, &ap); 989 if (error) 990 goto out_gunlock; 991 992 error = gfs2_inplace_reserve(dip, &ap); 993 if (error) 994 goto out_gunlock_q; 995 996 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 997 if (error) 998 goto out_ipres; 999 } else { 1000 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1001 if (error) 1002 goto out_ipres; 1003 } 1004 1005 error = gfs2_meta_inode_buffer(ip, &dibh); 1006 if (error) 1007 goto out_end_trans; 1008 1009 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1010 if (error) 1011 goto out_brelse; 1012 1013 gfs2_trans_add_meta(ip->i_gl, dibh); 1014 inc_nlink(&ip->i_inode); 1015 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1016 ihold(inode); 1017 d_instantiate(dentry, inode); 1018 mark_inode_dirty(inode); 1019 1020 out_brelse: 1021 brelse(dibh); 1022 out_end_trans: 1023 gfs2_trans_end(sdp); 1024 out_ipres: 1025 if (da.nr_blocks) 1026 gfs2_inplace_release(dip); 1027 out_gunlock_q: 1028 if (da.nr_blocks) 1029 gfs2_quota_unlock(dip); 1030 out_gunlock: 1031 gfs2_dir_no_add(&da); 1032 gfs2_glock_dq(ghs + 1); 1033 out_child: 1034 gfs2_glock_dq(ghs); 1035 out_parent: 1036 gfs2_qa_put(dip); 1037 gfs2_holder_uninit(ghs); 1038 gfs2_holder_uninit(ghs + 1); 1039 return error; 1040 } 1041 1042 /* 1043 * gfs2_unlink_ok - check to see that a inode is still in a directory 1044 * @dip: the directory 1045 * @name: the name of the file 1046 * @ip: the inode 1047 * 1048 * Assumes that the lock on (at least) @dip is held. 1049 * 1050 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1051 */ 1052 1053 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1054 const struct gfs2_inode *ip) 1055 { 1056 int error; 1057 1058 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1059 return -EPERM; 1060 1061 if ((dip->i_inode.i_mode & S_ISVTX) && 1062 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1063 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1064 return -EPERM; 1065 1066 if (IS_APPEND(&dip->i_inode)) 1067 return -EPERM; 1068 1069 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 1070 if (error) 1071 return error; 1072 1073 return gfs2_dir_check(&dip->i_inode, name, ip); 1074 } 1075 1076 /** 1077 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1078 * @dip: The parent directory 1079 * @name: The name of the entry in the parent directory 1080 * @inode: The inode to be removed 1081 * 1082 * Called with all the locks and in a transaction. This will only be 1083 * called for a directory after it has been checked to ensure it is empty. 1084 * 1085 * Returns: 0 on success, or an error 1086 */ 1087 1088 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1089 const struct dentry *dentry) 1090 { 1091 struct inode *inode = d_inode(dentry); 1092 struct gfs2_inode *ip = GFS2_I(inode); 1093 int error; 1094 1095 error = gfs2_dir_del(dip, dentry); 1096 if (error) 1097 return error; 1098 1099 ip->i_entries = 0; 1100 inode->i_ctime = current_time(inode); 1101 if (S_ISDIR(inode->i_mode)) 1102 clear_nlink(inode); 1103 else 1104 drop_nlink(inode); 1105 mark_inode_dirty(inode); 1106 if (inode->i_nlink == 0) 1107 gfs2_unlink_di(inode); 1108 return 0; 1109 } 1110 1111 1112 /** 1113 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1114 * @dir: The inode of the directory containing the inode to unlink 1115 * @dentry: The file itself 1116 * 1117 * This routine uses the type of the inode as a flag to figure out 1118 * whether this is an unlink or an rmdir. 1119 * 1120 * Returns: errno 1121 */ 1122 1123 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1124 { 1125 struct gfs2_inode *dip = GFS2_I(dir); 1126 struct gfs2_sbd *sdp = GFS2_SB(dir); 1127 struct inode *inode = d_inode(dentry); 1128 struct gfs2_inode *ip = GFS2_I(inode); 1129 struct gfs2_holder ghs[3]; 1130 struct gfs2_rgrpd *rgd; 1131 int error; 1132 1133 error = gfs2_rindex_update(sdp); 1134 if (error) 1135 return error; 1136 1137 error = -EROFS; 1138 1139 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1140 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1141 1142 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1143 if (!rgd) 1144 goto out_inodes; 1145 1146 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1147 1148 1149 error = gfs2_glock_nq(ghs); /* parent */ 1150 if (error) 1151 goto out_parent; 1152 1153 error = gfs2_glock_nq(ghs + 1); /* child */ 1154 if (error) 1155 goto out_child; 1156 1157 error = -ENOENT; 1158 if (inode->i_nlink == 0) 1159 goto out_rgrp; 1160 1161 if (S_ISDIR(inode->i_mode)) { 1162 error = -ENOTEMPTY; 1163 if (ip->i_entries > 2 || inode->i_nlink > 2) 1164 goto out_rgrp; 1165 } 1166 1167 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1168 if (error) 1169 goto out_rgrp; 1170 1171 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1172 if (error) 1173 goto out_gunlock; 1174 1175 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1176 if (error) 1177 goto out_gunlock; 1178 1179 error = gfs2_unlink_inode(dip, dentry); 1180 gfs2_trans_end(sdp); 1181 1182 out_gunlock: 1183 gfs2_glock_dq(ghs + 2); 1184 out_rgrp: 1185 gfs2_glock_dq(ghs + 1); 1186 out_child: 1187 gfs2_glock_dq(ghs); 1188 out_parent: 1189 gfs2_holder_uninit(ghs + 2); 1190 out_inodes: 1191 gfs2_holder_uninit(ghs + 1); 1192 gfs2_holder_uninit(ghs); 1193 return error; 1194 } 1195 1196 /** 1197 * gfs2_symlink - Create a symlink 1198 * @dir: The directory to create the symlink in 1199 * @dentry: The dentry to put the symlink in 1200 * @symname: The thing which the link points to 1201 * 1202 * Returns: errno 1203 */ 1204 1205 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1206 const char *symname) 1207 { 1208 unsigned int size; 1209 1210 size = strlen(symname); 1211 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1212 return -ENAMETOOLONG; 1213 1214 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1215 } 1216 1217 /** 1218 * gfs2_mkdir - Make a directory 1219 * @dir: The parent directory of the new one 1220 * @dentry: The dentry of the new directory 1221 * @mode: The mode of the new directory 1222 * 1223 * Returns: errno 1224 */ 1225 1226 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1227 { 1228 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1229 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1230 } 1231 1232 /** 1233 * gfs2_mknod - Make a special file 1234 * @dir: The directory in which the special file will reside 1235 * @dentry: The dentry of the special file 1236 * @mode: The mode of the special file 1237 * @dev: The device specification of the special file 1238 * 1239 */ 1240 1241 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1242 dev_t dev) 1243 { 1244 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1245 } 1246 1247 /** 1248 * gfs2_atomic_open - Atomically open a file 1249 * @dir: The directory 1250 * @dentry: The proposed new entry 1251 * @file: The proposed new struct file 1252 * @flags: open flags 1253 * @mode: File mode 1254 * 1255 * Returns: error code or 0 for success 1256 */ 1257 1258 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1259 struct file *file, unsigned flags, 1260 umode_t mode) 1261 { 1262 struct dentry *d; 1263 bool excl = !!(flags & O_EXCL); 1264 1265 if (!d_in_lookup(dentry)) 1266 goto skip_lookup; 1267 1268 d = __gfs2_lookup(dir, dentry, file); 1269 if (IS_ERR(d)) 1270 return PTR_ERR(d); 1271 if (d != NULL) 1272 dentry = d; 1273 if (d_really_is_positive(dentry)) { 1274 if (!(file->f_mode & FMODE_OPENED)) 1275 return finish_no_open(file, d); 1276 dput(d); 1277 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1278 } 1279 1280 BUG_ON(d != NULL); 1281 1282 skip_lookup: 1283 if (!(flags & O_CREAT)) 1284 return -ENOENT; 1285 1286 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1287 } 1288 1289 /* 1290 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1291 * @this: move this 1292 * @to: to here 1293 * 1294 * Follow @to back to the root and make sure we don't encounter @this 1295 * Assumes we already hold the rename lock. 1296 * 1297 * Returns: errno 1298 */ 1299 1300 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1301 { 1302 struct inode *dir = &to->i_inode; 1303 struct super_block *sb = dir->i_sb; 1304 struct inode *tmp; 1305 int error = 0; 1306 1307 igrab(dir); 1308 1309 for (;;) { 1310 if (dir == &this->i_inode) { 1311 error = -EINVAL; 1312 break; 1313 } 1314 if (dir == d_inode(sb->s_root)) { 1315 error = 0; 1316 break; 1317 } 1318 1319 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1320 if (!tmp) { 1321 error = -ENOENT; 1322 break; 1323 } 1324 if (IS_ERR(tmp)) { 1325 error = PTR_ERR(tmp); 1326 break; 1327 } 1328 1329 iput(dir); 1330 dir = tmp; 1331 } 1332 1333 iput(dir); 1334 1335 return error; 1336 } 1337 1338 /** 1339 * update_moved_ino - Update an inode that's being moved 1340 * @ip: The inode being moved 1341 * @ndip: The parent directory of the new filename 1342 * @dir_rename: True of ip is a directory 1343 * 1344 * Returns: errno 1345 */ 1346 1347 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1348 int dir_rename) 1349 { 1350 if (dir_rename) 1351 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1352 1353 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1354 mark_inode_dirty_sync(&ip->i_inode); 1355 return 0; 1356 } 1357 1358 1359 /** 1360 * gfs2_rename - Rename a file 1361 * @odir: Parent directory of old file name 1362 * @odentry: The old dentry of the file 1363 * @ndir: Parent directory of new file name 1364 * @ndentry: The new dentry of the file 1365 * 1366 * Returns: errno 1367 */ 1368 1369 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1370 struct inode *ndir, struct dentry *ndentry) 1371 { 1372 struct gfs2_inode *odip = GFS2_I(odir); 1373 struct gfs2_inode *ndip = GFS2_I(ndir); 1374 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1375 struct gfs2_inode *nip = NULL; 1376 struct gfs2_sbd *sdp = GFS2_SB(odir); 1377 struct gfs2_holder ghs[4], r_gh, rd_gh; 1378 struct gfs2_rgrpd *nrgd; 1379 unsigned int num_gh; 1380 int dir_rename = 0; 1381 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1382 unsigned int x; 1383 int error; 1384 1385 gfs2_holder_mark_uninitialized(&r_gh); 1386 gfs2_holder_mark_uninitialized(&rd_gh); 1387 if (d_really_is_positive(ndentry)) { 1388 nip = GFS2_I(d_inode(ndentry)); 1389 if (ip == nip) 1390 return 0; 1391 } 1392 1393 error = gfs2_rindex_update(sdp); 1394 if (error) 1395 return error; 1396 1397 error = gfs2_qa_get(ndip); 1398 if (error) 1399 return error; 1400 1401 if (odip != ndip) { 1402 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1403 0, &r_gh); 1404 if (error) 1405 goto out; 1406 1407 if (S_ISDIR(ip->i_inode.i_mode)) { 1408 dir_rename = 1; 1409 /* don't move a directory into its subdir */ 1410 error = gfs2_ok_to_move(ip, ndip); 1411 if (error) 1412 goto out_gunlock_r; 1413 } 1414 } 1415 1416 num_gh = 1; 1417 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1418 if (odip != ndip) { 1419 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1420 ghs + num_gh); 1421 num_gh++; 1422 } 1423 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1424 num_gh++; 1425 1426 if (nip) { 1427 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1428 ghs + num_gh); 1429 num_gh++; 1430 } 1431 1432 for (x = 0; x < num_gh; x++) { 1433 error = gfs2_glock_nq(ghs + x); 1434 if (error) 1435 goto out_gunlock; 1436 } 1437 error = gfs2_glock_async_wait(num_gh, ghs); 1438 if (error) 1439 goto out_gunlock; 1440 1441 if (nip) { 1442 /* Grab the resource group glock for unlink flag twiddling. 1443 * This is the case where the target dinode already exists 1444 * so we unlink before doing the rename. 1445 */ 1446 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1447 if (!nrgd) { 1448 error = -ENOENT; 1449 goto out_gunlock; 1450 } 1451 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, 1452 &rd_gh); 1453 if (error) 1454 goto out_gunlock; 1455 } 1456 1457 error = -ENOENT; 1458 if (ip->i_inode.i_nlink == 0) 1459 goto out_gunlock; 1460 1461 /* Check out the old directory */ 1462 1463 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1464 if (error) 1465 goto out_gunlock; 1466 1467 /* Check out the new directory */ 1468 1469 if (nip) { 1470 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1471 if (error) 1472 goto out_gunlock; 1473 1474 if (nip->i_inode.i_nlink == 0) { 1475 error = -EAGAIN; 1476 goto out_gunlock; 1477 } 1478 1479 if (S_ISDIR(nip->i_inode.i_mode)) { 1480 if (nip->i_entries < 2) { 1481 gfs2_consist_inode(nip); 1482 error = -EIO; 1483 goto out_gunlock; 1484 } 1485 if (nip->i_entries > 2) { 1486 error = -ENOTEMPTY; 1487 goto out_gunlock; 1488 } 1489 } 1490 } else { 1491 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1492 if (error) 1493 goto out_gunlock; 1494 1495 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1496 switch (error) { 1497 case -ENOENT: 1498 error = 0; 1499 break; 1500 case 0: 1501 error = -EEXIST; 1502 default: 1503 goto out_gunlock; 1504 } 1505 1506 if (odip != ndip) { 1507 if (!ndip->i_inode.i_nlink) { 1508 error = -ENOENT; 1509 goto out_gunlock; 1510 } 1511 if (ndip->i_entries == (u32)-1) { 1512 error = -EFBIG; 1513 goto out_gunlock; 1514 } 1515 if (S_ISDIR(ip->i_inode.i_mode) && 1516 ndip->i_inode.i_nlink == (u32)-1) { 1517 error = -EMLINK; 1518 goto out_gunlock; 1519 } 1520 } 1521 } 1522 1523 /* Check out the dir to be renamed */ 1524 1525 if (dir_rename) { 1526 error = gfs2_permission(d_inode(odentry), MAY_WRITE); 1527 if (error) 1528 goto out_gunlock; 1529 } 1530 1531 if (nip == NULL) { 1532 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1533 if (error) 1534 goto out_gunlock; 1535 } 1536 1537 if (da.nr_blocks) { 1538 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1539 error = gfs2_quota_lock_check(ndip, &ap); 1540 if (error) 1541 goto out_gunlock; 1542 1543 error = gfs2_inplace_reserve(ndip, &ap); 1544 if (error) 1545 goto out_gunlock_q; 1546 1547 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1548 4 * RES_LEAF + 4, 0); 1549 if (error) 1550 goto out_ipreserv; 1551 } else { 1552 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1553 5 * RES_LEAF + 4, 0); 1554 if (error) 1555 goto out_gunlock; 1556 } 1557 1558 /* Remove the target file, if it exists */ 1559 1560 if (nip) 1561 error = gfs2_unlink_inode(ndip, ndentry); 1562 1563 error = update_moved_ino(ip, ndip, dir_rename); 1564 if (error) 1565 goto out_end_trans; 1566 1567 error = gfs2_dir_del(odip, odentry); 1568 if (error) 1569 goto out_end_trans; 1570 1571 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1572 if (error) 1573 goto out_end_trans; 1574 1575 out_end_trans: 1576 gfs2_trans_end(sdp); 1577 out_ipreserv: 1578 if (da.nr_blocks) 1579 gfs2_inplace_release(ndip); 1580 out_gunlock_q: 1581 if (da.nr_blocks) 1582 gfs2_quota_unlock(ndip); 1583 out_gunlock: 1584 gfs2_dir_no_add(&da); 1585 if (gfs2_holder_initialized(&rd_gh)) 1586 gfs2_glock_dq_uninit(&rd_gh); 1587 1588 while (x--) { 1589 if (gfs2_holder_queued(ghs + x)) 1590 gfs2_glock_dq(ghs + x); 1591 gfs2_holder_uninit(ghs + x); 1592 } 1593 out_gunlock_r: 1594 if (gfs2_holder_initialized(&r_gh)) 1595 gfs2_glock_dq_uninit(&r_gh); 1596 out: 1597 gfs2_qa_put(ndip); 1598 return error; 1599 } 1600 1601 /** 1602 * gfs2_exchange - exchange two files 1603 * @odir: Parent directory of old file name 1604 * @odentry: The old dentry of the file 1605 * @ndir: Parent directory of new file name 1606 * @ndentry: The new dentry of the file 1607 * @flags: The rename flags 1608 * 1609 * Returns: errno 1610 */ 1611 1612 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1613 struct inode *ndir, struct dentry *ndentry, 1614 unsigned int flags) 1615 { 1616 struct gfs2_inode *odip = GFS2_I(odir); 1617 struct gfs2_inode *ndip = GFS2_I(ndir); 1618 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1619 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1620 struct gfs2_sbd *sdp = GFS2_SB(odir); 1621 struct gfs2_holder ghs[4], r_gh; 1622 unsigned int num_gh; 1623 unsigned int x; 1624 umode_t old_mode = oip->i_inode.i_mode; 1625 umode_t new_mode = nip->i_inode.i_mode; 1626 int error; 1627 1628 gfs2_holder_mark_uninitialized(&r_gh); 1629 error = gfs2_rindex_update(sdp); 1630 if (error) 1631 return error; 1632 1633 if (odip != ndip) { 1634 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1635 0, &r_gh); 1636 if (error) 1637 goto out; 1638 1639 if (S_ISDIR(old_mode)) { 1640 /* don't move a directory into its subdir */ 1641 error = gfs2_ok_to_move(oip, ndip); 1642 if (error) 1643 goto out_gunlock_r; 1644 } 1645 1646 if (S_ISDIR(new_mode)) { 1647 /* don't move a directory into its subdir */ 1648 error = gfs2_ok_to_move(nip, odip); 1649 if (error) 1650 goto out_gunlock_r; 1651 } 1652 } 1653 1654 num_gh = 1; 1655 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1656 if (odip != ndip) { 1657 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1658 ghs + num_gh); 1659 num_gh++; 1660 } 1661 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1662 num_gh++; 1663 1664 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1665 num_gh++; 1666 1667 for (x = 0; x < num_gh; x++) { 1668 error = gfs2_glock_nq(ghs + x); 1669 if (error) 1670 goto out_gunlock; 1671 } 1672 1673 error = gfs2_glock_async_wait(num_gh, ghs); 1674 if (error) 1675 goto out_gunlock; 1676 1677 error = -ENOENT; 1678 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1679 goto out_gunlock; 1680 1681 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1682 if (error) 1683 goto out_gunlock; 1684 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1685 if (error) 1686 goto out_gunlock; 1687 1688 if (S_ISDIR(old_mode)) { 1689 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1690 if (error) 1691 goto out_gunlock; 1692 } 1693 if (S_ISDIR(new_mode)) { 1694 error = gfs2_permission(ndentry->d_inode, MAY_WRITE); 1695 if (error) 1696 goto out_gunlock; 1697 } 1698 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1699 if (error) 1700 goto out_gunlock; 1701 1702 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1703 if (error) 1704 goto out_end_trans; 1705 1706 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1707 if (error) 1708 goto out_end_trans; 1709 1710 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1711 IF2DT(old_mode)); 1712 if (error) 1713 goto out_end_trans; 1714 1715 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1716 IF2DT(new_mode)); 1717 if (error) 1718 goto out_end_trans; 1719 1720 if (odip != ndip) { 1721 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1722 inc_nlink(&odip->i_inode); 1723 drop_nlink(&ndip->i_inode); 1724 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1725 inc_nlink(&ndip->i_inode); 1726 drop_nlink(&odip->i_inode); 1727 } 1728 } 1729 mark_inode_dirty(&ndip->i_inode); 1730 if (odip != ndip) 1731 mark_inode_dirty(&odip->i_inode); 1732 1733 out_end_trans: 1734 gfs2_trans_end(sdp); 1735 out_gunlock: 1736 while (x--) { 1737 if (gfs2_holder_queued(ghs + x)) 1738 gfs2_glock_dq(ghs + x); 1739 gfs2_holder_uninit(ghs + x); 1740 } 1741 out_gunlock_r: 1742 if (gfs2_holder_initialized(&r_gh)) 1743 gfs2_glock_dq_uninit(&r_gh); 1744 out: 1745 return error; 1746 } 1747 1748 static int gfs2_rename2(struct inode *odir, struct dentry *odentry, 1749 struct inode *ndir, struct dentry *ndentry, 1750 unsigned int flags) 1751 { 1752 flags &= ~RENAME_NOREPLACE; 1753 1754 if (flags & ~RENAME_EXCHANGE) 1755 return -EINVAL; 1756 1757 if (flags & RENAME_EXCHANGE) 1758 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1759 1760 return gfs2_rename(odir, odentry, ndir, ndentry); 1761 } 1762 1763 /** 1764 * gfs2_get_link - Follow a symbolic link 1765 * @dentry: The dentry of the link 1766 * @inode: The inode of the link 1767 * @done: destructor for return value 1768 * 1769 * This can handle symlinks of any size. 1770 * 1771 * Returns: 0 on success or error code 1772 */ 1773 1774 static const char *gfs2_get_link(struct dentry *dentry, 1775 struct inode *inode, 1776 struct delayed_call *done) 1777 { 1778 struct gfs2_inode *ip = GFS2_I(inode); 1779 struct gfs2_holder i_gh; 1780 struct buffer_head *dibh; 1781 unsigned int size; 1782 char *buf; 1783 int error; 1784 1785 if (!dentry) 1786 return ERR_PTR(-ECHILD); 1787 1788 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1789 error = gfs2_glock_nq(&i_gh); 1790 if (error) { 1791 gfs2_holder_uninit(&i_gh); 1792 return ERR_PTR(error); 1793 } 1794 1795 size = (unsigned int)i_size_read(&ip->i_inode); 1796 if (size == 0) { 1797 gfs2_consist_inode(ip); 1798 buf = ERR_PTR(-EIO); 1799 goto out; 1800 } 1801 1802 error = gfs2_meta_inode_buffer(ip, &dibh); 1803 if (error) { 1804 buf = ERR_PTR(error); 1805 goto out; 1806 } 1807 1808 buf = kzalloc(size + 1, GFP_NOFS); 1809 if (!buf) 1810 buf = ERR_PTR(-ENOMEM); 1811 else 1812 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1813 brelse(dibh); 1814 out: 1815 gfs2_glock_dq_uninit(&i_gh); 1816 if (!IS_ERR(buf)) 1817 set_delayed_call(done, kfree_link, buf); 1818 return buf; 1819 } 1820 1821 /** 1822 * gfs2_permission - 1823 * @inode: The inode 1824 * @mask: The mask to be tested 1825 * @flags: Indicates whether this is an RCU path walk or not 1826 * 1827 * This may be called from the VFS directly, or from within GFS2 with the 1828 * inode locked, so we look to see if the glock is already locked and only 1829 * lock the glock if its not already been done. 1830 * 1831 * Returns: errno 1832 */ 1833 1834 int gfs2_permission(struct inode *inode, int mask) 1835 { 1836 struct gfs2_inode *ip; 1837 struct gfs2_holder i_gh; 1838 int error; 1839 1840 gfs2_holder_mark_uninitialized(&i_gh); 1841 ip = GFS2_I(inode); 1842 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1843 if (mask & MAY_NOT_BLOCK) 1844 return -ECHILD; 1845 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1846 if (error) 1847 return error; 1848 } 1849 1850 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1851 error = -EPERM; 1852 else 1853 error = generic_permission(inode, mask); 1854 if (gfs2_holder_initialized(&i_gh)) 1855 gfs2_glock_dq_uninit(&i_gh); 1856 1857 return error; 1858 } 1859 1860 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1861 { 1862 setattr_copy(inode, attr); 1863 mark_inode_dirty(inode); 1864 return 0; 1865 } 1866 1867 /** 1868 * gfs2_setattr_simple - 1869 * @ip: 1870 * @attr: 1871 * 1872 * Returns: errno 1873 */ 1874 1875 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1876 { 1877 int error; 1878 1879 if (current->journal_info) 1880 return __gfs2_setattr_simple(inode, attr); 1881 1882 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1883 if (error) 1884 return error; 1885 1886 error = __gfs2_setattr_simple(inode, attr); 1887 gfs2_trans_end(GFS2_SB(inode)); 1888 return error; 1889 } 1890 1891 static int setattr_chown(struct inode *inode, struct iattr *attr) 1892 { 1893 struct gfs2_inode *ip = GFS2_I(inode); 1894 struct gfs2_sbd *sdp = GFS2_SB(inode); 1895 kuid_t ouid, nuid; 1896 kgid_t ogid, ngid; 1897 int error; 1898 struct gfs2_alloc_parms ap; 1899 1900 ouid = inode->i_uid; 1901 ogid = inode->i_gid; 1902 nuid = attr->ia_uid; 1903 ngid = attr->ia_gid; 1904 1905 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1906 ouid = nuid = NO_UID_QUOTA_CHANGE; 1907 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1908 ogid = ngid = NO_GID_QUOTA_CHANGE; 1909 error = gfs2_qa_get(ip); 1910 if (error) 1911 return error; 1912 1913 error = gfs2_rindex_update(sdp); 1914 if (error) 1915 goto out; 1916 1917 error = gfs2_quota_lock(ip, nuid, ngid); 1918 if (error) 1919 goto out; 1920 1921 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1922 1923 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1924 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1925 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1926 if (error) 1927 goto out_gunlock_q; 1928 } 1929 1930 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1931 if (error) 1932 goto out_gunlock_q; 1933 1934 error = gfs2_setattr_simple(inode, attr); 1935 if (error) 1936 goto out_end_trans; 1937 1938 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1939 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1940 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1941 gfs2_quota_change(ip, ap.target, nuid, ngid); 1942 } 1943 1944 out_end_trans: 1945 gfs2_trans_end(sdp); 1946 out_gunlock_q: 1947 gfs2_quota_unlock(ip); 1948 out: 1949 gfs2_qa_put(ip); 1950 return error; 1951 } 1952 1953 /** 1954 * gfs2_setattr - Change attributes on an inode 1955 * @dentry: The dentry which is changing 1956 * @attr: The structure describing the change 1957 * 1958 * The VFS layer wants to change one or more of an inodes attributes. Write 1959 * that change out to disk. 1960 * 1961 * Returns: errno 1962 */ 1963 1964 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1965 { 1966 struct inode *inode = d_inode(dentry); 1967 struct gfs2_inode *ip = GFS2_I(inode); 1968 struct gfs2_holder i_gh; 1969 int error; 1970 1971 error = gfs2_qa_get(ip); 1972 if (error) 1973 return error; 1974 1975 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1976 if (error) 1977 goto out; 1978 1979 error = -EPERM; 1980 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1981 goto error; 1982 1983 error = setattr_prepare(dentry, attr); 1984 if (error) 1985 goto error; 1986 1987 if (attr->ia_valid & ATTR_SIZE) 1988 error = gfs2_setattr_size(inode, attr->ia_size); 1989 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1990 error = setattr_chown(inode, attr); 1991 else { 1992 error = gfs2_setattr_simple(inode, attr); 1993 if (!error && attr->ia_valid & ATTR_MODE) 1994 error = posix_acl_chmod(inode, inode->i_mode); 1995 } 1996 1997 error: 1998 if (!error) 1999 mark_inode_dirty(inode); 2000 gfs2_glock_dq_uninit(&i_gh); 2001 out: 2002 gfs2_qa_put(ip); 2003 return error; 2004 } 2005 2006 /** 2007 * gfs2_getattr - Read out an inode's attributes 2008 * @path: Object to query 2009 * @stat: The inode's stats 2010 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2011 * @flags: AT_STATX_xxx setting 2012 * 2013 * This may be called from the VFS directly, or from within GFS2 with the 2014 * inode locked, so we look to see if the glock is already locked and only 2015 * lock the glock if its not already been done. Note that its the NFS 2016 * readdirplus operation which causes this to be called (from filldir) 2017 * with the glock already held. 2018 * 2019 * Returns: errno 2020 */ 2021 2022 static int gfs2_getattr(const struct path *path, struct kstat *stat, 2023 u32 request_mask, unsigned int flags) 2024 { 2025 struct inode *inode = d_inode(path->dentry); 2026 struct gfs2_inode *ip = GFS2_I(inode); 2027 struct gfs2_holder gh; 2028 u32 gfsflags; 2029 int error; 2030 2031 gfs2_holder_mark_uninitialized(&gh); 2032 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2033 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2034 if (error) 2035 return error; 2036 } 2037 2038 gfsflags = ip->i_diskflags; 2039 if (gfsflags & GFS2_DIF_APPENDONLY) 2040 stat->attributes |= STATX_ATTR_APPEND; 2041 if (gfsflags & GFS2_DIF_IMMUTABLE) 2042 stat->attributes |= STATX_ATTR_IMMUTABLE; 2043 2044 stat->attributes_mask |= (STATX_ATTR_APPEND | 2045 STATX_ATTR_COMPRESSED | 2046 STATX_ATTR_ENCRYPTED | 2047 STATX_ATTR_IMMUTABLE | 2048 STATX_ATTR_NODUMP); 2049 2050 generic_fillattr(inode, stat); 2051 2052 if (gfs2_holder_initialized(&gh)) 2053 gfs2_glock_dq_uninit(&gh); 2054 2055 return 0; 2056 } 2057 2058 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2059 u64 start, u64 len) 2060 { 2061 struct gfs2_inode *ip = GFS2_I(inode); 2062 struct gfs2_holder gh; 2063 int ret; 2064 2065 inode_lock_shared(inode); 2066 2067 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2068 if (ret) 2069 goto out; 2070 2071 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2072 2073 gfs2_glock_dq_uninit(&gh); 2074 2075 out: 2076 inode_unlock_shared(inode); 2077 return ret; 2078 } 2079 2080 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2081 { 2082 struct inode *inode = file->f_mapping->host; 2083 struct gfs2_inode *ip = GFS2_I(inode); 2084 struct gfs2_holder gh; 2085 loff_t ret; 2086 2087 inode_lock_shared(inode); 2088 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2089 if (!ret) 2090 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2091 gfs2_glock_dq_uninit(&gh); 2092 inode_unlock_shared(inode); 2093 2094 if (ret < 0) 2095 return ret; 2096 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2097 } 2098 2099 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2100 { 2101 struct inode *inode = file->f_mapping->host; 2102 struct gfs2_inode *ip = GFS2_I(inode); 2103 struct gfs2_holder gh; 2104 loff_t ret; 2105 2106 inode_lock_shared(inode); 2107 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2108 if (!ret) 2109 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2110 gfs2_glock_dq_uninit(&gh); 2111 inode_unlock_shared(inode); 2112 2113 if (ret < 0) 2114 return ret; 2115 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2116 } 2117 2118 const struct inode_operations gfs2_file_iops = { 2119 .permission = gfs2_permission, 2120 .setattr = gfs2_setattr, 2121 .getattr = gfs2_getattr, 2122 .listxattr = gfs2_listxattr, 2123 .fiemap = gfs2_fiemap, 2124 .get_acl = gfs2_get_acl, 2125 .set_acl = gfs2_set_acl, 2126 }; 2127 2128 const struct inode_operations gfs2_dir_iops = { 2129 .create = gfs2_create, 2130 .lookup = gfs2_lookup, 2131 .link = gfs2_link, 2132 .unlink = gfs2_unlink, 2133 .symlink = gfs2_symlink, 2134 .mkdir = gfs2_mkdir, 2135 .rmdir = gfs2_unlink, 2136 .mknod = gfs2_mknod, 2137 .rename = gfs2_rename2, 2138 .permission = gfs2_permission, 2139 .setattr = gfs2_setattr, 2140 .getattr = gfs2_getattr, 2141 .listxattr = gfs2_listxattr, 2142 .fiemap = gfs2_fiemap, 2143 .get_acl = gfs2_get_acl, 2144 .set_acl = gfs2_set_acl, 2145 .atomic_open = gfs2_atomic_open, 2146 }; 2147 2148 const struct inode_operations gfs2_symlink_iops = { 2149 .get_link = gfs2_get_link, 2150 .permission = gfs2_permission, 2151 .setattr = gfs2_setattr, 2152 .getattr = gfs2_getattr, 2153 .listxattr = gfs2_listxattr, 2154 .fiemap = gfs2_fiemap, 2155 }; 2156 2157