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