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 const struct inode_operations gfs2_file_iops; 40 static const struct inode_operations gfs2_dir_iops; 41 static const struct inode_operations gfs2_symlink_iops; 42 43 static int iget_test(struct inode *inode, void *opaque) 44 { 45 u64 no_addr = *(u64 *)opaque; 46 47 return GFS2_I(inode)->i_no_addr == no_addr; 48 } 49 50 static int iget_set(struct inode *inode, void *opaque) 51 { 52 u64 no_addr = *(u64 *)opaque; 53 54 GFS2_I(inode)->i_no_addr = no_addr; 55 inode->i_ino = no_addr; 56 return 0; 57 } 58 59 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) 60 { 61 struct inode *inode; 62 63 repeat: 64 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr); 65 if (!inode) 66 return inode; 67 if (is_bad_inode(inode)) { 68 iput(inode); 69 goto repeat; 70 } 71 return inode; 72 } 73 74 /** 75 * gfs2_set_iop - Sets inode operations 76 * @inode: The inode with correct i_mode filled in 77 * 78 * GFS2 lookup code fills in vfs inode contents based on info obtained 79 * from directory entry inside gfs2_inode_lookup(). 80 */ 81 82 static void gfs2_set_iop(struct inode *inode) 83 { 84 struct gfs2_sbd *sdp = GFS2_SB(inode); 85 umode_t mode = inode->i_mode; 86 87 if (S_ISREG(mode)) { 88 inode->i_op = &gfs2_file_iops; 89 if (gfs2_localflocks(sdp)) 90 inode->i_fop = &gfs2_file_fops_nolock; 91 else 92 inode->i_fop = &gfs2_file_fops; 93 } else if (S_ISDIR(mode)) { 94 inode->i_op = &gfs2_dir_iops; 95 if (gfs2_localflocks(sdp)) 96 inode->i_fop = &gfs2_dir_fops_nolock; 97 else 98 inode->i_fop = &gfs2_dir_fops; 99 } else if (S_ISLNK(mode)) { 100 inode->i_op = &gfs2_symlink_iops; 101 } else { 102 inode->i_op = &gfs2_file_iops; 103 init_special_inode(inode, inode->i_mode, inode->i_rdev); 104 } 105 } 106 107 /** 108 * gfs2_inode_lookup - Lookup an inode 109 * @sb: The super block 110 * @type: The type of the inode 111 * @no_addr: The inode number 112 * @no_formal_ino: The inode generation number 113 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; 114 * GFS2_BLKST_FREE to indicate not to verify) 115 * 116 * If @type is DT_UNKNOWN, the inode type is fetched from disk. 117 * 118 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a 119 * placeholder because it doesn't otherwise make sense), the on-disk block type 120 * is verified to be @blktype. 121 * 122 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE) 123 * if it detects that @no_formal_ino doesn't match the actual inode generation 124 * number. However, it doesn't always know unless @type is DT_UNKNOWN. 125 * 126 * Returns: A VFS inode, or an error 127 */ 128 129 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 130 u64 no_addr, u64 no_formal_ino, 131 unsigned int blktype) 132 { 133 struct inode *inode; 134 struct gfs2_inode *ip; 135 struct gfs2_glock *io_gl = NULL; 136 struct gfs2_holder i_gh; 137 int error; 138 139 gfs2_holder_mark_uninitialized(&i_gh); 140 inode = gfs2_iget(sb, no_addr); 141 if (!inode) 142 return ERR_PTR(-ENOMEM); 143 144 ip = GFS2_I(inode); 145 146 if (inode->i_state & I_NEW) { 147 struct gfs2_sbd *sdp = GFS2_SB(inode); 148 149 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 150 if (unlikely(error)) 151 goto fail; 152 flush_delayed_work(&ip->i_gl->gl_work); 153 154 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 155 if (unlikely(error)) 156 goto fail; 157 if (blktype != GFS2_BLKST_UNLINKED) 158 gfs2_cancel_delete_work(io_gl); 159 160 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { 161 /* 162 * The GL_SKIP flag indicates to skip reading the inode 163 * block. We read the inode with gfs2_inode_refresh 164 * after possibly checking the block type. 165 */ 166 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 167 GL_SKIP, &i_gh); 168 if (error) 169 goto fail; 170 171 error = -ESTALE; 172 if (no_formal_ino && 173 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) 174 goto fail; 175 176 if (blktype != GFS2_BLKST_FREE) { 177 error = gfs2_check_blk_type(sdp, no_addr, 178 blktype); 179 if (error) 180 goto fail; 181 } 182 } 183 184 glock_set_object(ip->i_gl, ip); 185 set_bit(GIF_INVALID, &ip->i_flags); 186 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 187 if (unlikely(error)) 188 goto fail; 189 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 190 gfs2_glock_put(io_gl); 191 io_gl = NULL; 192 193 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ 194 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); 195 inode->i_atime.tv_nsec = 0; 196 197 if (type == DT_UNKNOWN) { 198 /* Inode glock must be locked already */ 199 error = gfs2_inode_refresh(GFS2_I(inode)); 200 if (error) 201 goto fail; 202 } else { 203 ip->i_no_formal_ino = no_formal_ino; 204 inode->i_mode = DT2IF(type); 205 } 206 207 if (gfs2_holder_initialized(&i_gh)) 208 gfs2_glock_dq_uninit(&i_gh); 209 210 gfs2_set_iop(inode); 211 } 212 213 if (no_formal_ino && ip->i_no_formal_ino && 214 no_formal_ino != ip->i_no_formal_ino) { 215 error = -ESTALE; 216 if (inode->i_state & I_NEW) 217 goto fail; 218 iput(inode); 219 return ERR_PTR(error); 220 } 221 222 if (inode->i_state & I_NEW) 223 unlock_new_inode(inode); 224 225 return inode; 226 227 fail: 228 if (io_gl) 229 gfs2_glock_put(io_gl); 230 if (gfs2_holder_initialized(&i_gh)) 231 gfs2_glock_dq_uninit(&i_gh); 232 iget_failed(inode); 233 return ERR_PTR(error); 234 } 235 236 /** 237 * gfs2_lookup_by_inum - look up an inode by inode number 238 * @sdp: The super block 239 * @no_addr: The inode number 240 * @no_formal_ino: The inode generation number (0 for any) 241 * @blktype: Requested block type (see gfs2_inode_lookup) 242 */ 243 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 244 u64 no_formal_ino, unsigned int blktype) 245 { 246 struct super_block *sb = sdp->sd_vfs; 247 struct inode *inode; 248 int error; 249 250 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 251 blktype); 252 if (IS_ERR(inode)) 253 return inode; 254 255 if (no_formal_ino) { 256 error = -EIO; 257 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 258 goto fail_iput; 259 } 260 return inode; 261 262 fail_iput: 263 iput(inode); 264 return ERR_PTR(error); 265 } 266 267 268 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 269 { 270 struct qstr qstr; 271 struct inode *inode; 272 gfs2_str2qstr(&qstr, name); 273 inode = gfs2_lookupi(dip, &qstr, 1); 274 /* gfs2_lookupi has inconsistent callers: vfs 275 * related routines expect NULL for no entry found, 276 * gfs2_lookup_simple callers expect ENOENT 277 * and do not check for NULL. 278 */ 279 if (inode == NULL) 280 return ERR_PTR(-ENOENT); 281 else 282 return inode; 283 } 284 285 286 /** 287 * gfs2_lookupi - Look up a filename in a directory and return its inode 288 * @d_gh: An initialized holder for the directory glock 289 * @name: The name of the inode to look for 290 * @is_root: If 1, ignore the caller's permissions 291 * @i_gh: An uninitialized holder for the new inode glock 292 * 293 * This can be called via the VFS filldir function when NFS is doing 294 * a readdirplus and the inode which its intending to stat isn't 295 * already in cache. In this case we must not take the directory glock 296 * again, since the readdir call will have already taken that lock. 297 * 298 * Returns: errno 299 */ 300 301 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 302 int is_root) 303 { 304 struct super_block *sb = dir->i_sb; 305 struct gfs2_inode *dip = GFS2_I(dir); 306 struct gfs2_holder d_gh; 307 int error = 0; 308 struct inode *inode = NULL; 309 310 gfs2_holder_mark_uninitialized(&d_gh); 311 if (!name->len || name->len > GFS2_FNAMESIZE) 312 return ERR_PTR(-ENAMETOOLONG); 313 314 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 315 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 316 dir == d_inode(sb->s_root))) { 317 igrab(dir); 318 return dir; 319 } 320 321 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 322 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 323 if (error) 324 return ERR_PTR(error); 325 } 326 327 if (!is_root) { 328 error = gfs2_permission(dir, MAY_EXEC); 329 if (error) 330 goto out; 331 } 332 333 inode = gfs2_dir_search(dir, name, false); 334 if (IS_ERR(inode)) 335 error = PTR_ERR(inode); 336 out: 337 if (gfs2_holder_initialized(&d_gh)) 338 gfs2_glock_dq_uninit(&d_gh); 339 if (error == -ENOENT) 340 return NULL; 341 return inode ? inode : ERR_PTR(error); 342 } 343 344 /** 345 * create_ok - OK to create a new on-disk inode here? 346 * @dip: Directory in which dinode is to be created 347 * @name: Name of new dinode 348 * @mode: 349 * 350 * Returns: errno 351 */ 352 353 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 354 umode_t mode) 355 { 356 int error; 357 358 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 359 if (error) 360 return error; 361 362 /* Don't create entries in an unlinked directory */ 363 if (!dip->i_inode.i_nlink) 364 return -ENOENT; 365 366 if (dip->i_entries == (u32)-1) 367 return -EFBIG; 368 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 369 return -EMLINK; 370 371 return 0; 372 } 373 374 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 375 struct inode *inode) 376 { 377 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 378 (dip->i_inode.i_mode & S_ISUID) && 379 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 380 if (S_ISDIR(inode->i_mode)) 381 inode->i_mode |= S_ISUID; 382 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 383 inode->i_mode &= ~07111; 384 inode->i_uid = dip->i_inode.i_uid; 385 } else 386 inode->i_uid = current_fsuid(); 387 388 if (dip->i_inode.i_mode & S_ISGID) { 389 if (S_ISDIR(inode->i_mode)) 390 inode->i_mode |= S_ISGID; 391 inode->i_gid = dip->i_inode.i_gid; 392 } else 393 inode->i_gid = current_fsgid(); 394 } 395 396 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 397 { 398 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 399 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 400 int error; 401 402 error = gfs2_quota_lock_check(ip, &ap); 403 if (error) 404 goto out; 405 406 error = gfs2_inplace_reserve(ip, &ap); 407 if (error) 408 goto out_quota; 409 410 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 411 if (error) 412 goto out_ipreserv; 413 414 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); 415 ip->i_no_formal_ino = ip->i_generation; 416 ip->i_inode.i_ino = ip->i_no_addr; 417 ip->i_goal = ip->i_no_addr; 418 419 gfs2_trans_end(sdp); 420 421 out_ipreserv: 422 gfs2_inplace_release(ip); 423 out_quota: 424 gfs2_quota_unlock(ip); 425 out: 426 return error; 427 } 428 429 static void gfs2_init_dir(struct buffer_head *dibh, 430 const struct gfs2_inode *parent) 431 { 432 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 433 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 434 435 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 436 dent->de_inum = di->di_num; /* already GFS2 endian */ 437 dent->de_type = cpu_to_be16(DT_DIR); 438 439 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 440 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 441 gfs2_inum_out(parent, dent); 442 dent->de_type = cpu_to_be16(DT_DIR); 443 444 } 445 446 /** 447 * gfs2_init_xattr - Initialise an xattr block for a new inode 448 * @ip: The inode in question 449 * 450 * This sets up an empty xattr block for a new inode, ready to 451 * take any ACLs, LSM xattrs, etc. 452 */ 453 454 static void gfs2_init_xattr(struct gfs2_inode *ip) 455 { 456 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 457 struct buffer_head *bh; 458 struct gfs2_ea_header *ea; 459 460 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 461 gfs2_trans_add_meta(ip->i_gl, bh); 462 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 463 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 464 465 ea = GFS2_EA_BH2FIRST(bh); 466 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 467 ea->ea_type = GFS2_EATYPE_UNUSED; 468 ea->ea_flags = GFS2_EAFLAG_LAST; 469 470 brelse(bh); 471 } 472 473 /** 474 * init_dinode - Fill in a new dinode structure 475 * @dip: The directory this inode is being created in 476 * @ip: The inode 477 * @symname: The symlink destination (if a symlink) 478 * @bhp: The buffer head (returned to caller) 479 * 480 */ 481 482 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 483 const char *symname) 484 { 485 struct gfs2_dinode *di; 486 struct buffer_head *dibh; 487 488 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 489 gfs2_trans_add_meta(ip->i_gl, dibh); 490 di = (struct gfs2_dinode *)dibh->b_data; 491 gfs2_dinode_out(ip, di); 492 493 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 494 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 495 di->__pad1 = 0; 496 di->__pad2 = 0; 497 di->__pad3 = 0; 498 memset(&di->__pad4, 0, sizeof(di->__pad4)); 499 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 500 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 501 502 switch(ip->i_inode.i_mode & S_IFMT) { 503 case S_IFDIR: 504 gfs2_init_dir(dibh, dip); 505 break; 506 case S_IFLNK: 507 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 508 break; 509 } 510 511 set_buffer_uptodate(dibh); 512 brelse(dibh); 513 } 514 515 /** 516 * gfs2_trans_da_blocks - Calculate number of blocks to link inode 517 * @dip: The directory we are linking into 518 * @da: The dir add information 519 * @nr_inodes: The number of inodes involved 520 * 521 * This calculate the number of blocks we need to reserve in a 522 * transaction to link @nr_inodes into a directory. In most cases 523 * @nr_inodes will be 2 (the directory plus the inode being linked in) 524 * but in case of rename, 4 may be required. 525 * 526 * Returns: Number of blocks 527 */ 528 529 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 530 const struct gfs2_diradd *da, 531 unsigned nr_inodes) 532 { 533 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 534 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 535 } 536 537 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 538 struct gfs2_inode *ip, struct gfs2_diradd *da) 539 { 540 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 541 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 542 int error; 543 544 if (da->nr_blocks) { 545 error = gfs2_quota_lock_check(dip, &ap); 546 if (error) 547 goto fail_quota_locks; 548 549 error = gfs2_inplace_reserve(dip, &ap); 550 if (error) 551 goto fail_quota_locks; 552 553 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 554 if (error) 555 goto fail_ipreserv; 556 } else { 557 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 558 if (error) 559 goto fail_quota_locks; 560 } 561 562 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 563 564 gfs2_trans_end(sdp); 565 fail_ipreserv: 566 gfs2_inplace_release(dip); 567 fail_quota_locks: 568 gfs2_quota_unlock(dip); 569 return error; 570 } 571 572 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 573 void *fs_info) 574 { 575 const struct xattr *xattr; 576 int err = 0; 577 578 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 579 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 580 xattr->value_len, 0, 581 GFS2_EATYPE_SECURITY); 582 if (err < 0) 583 break; 584 } 585 return err; 586 } 587 588 /** 589 * gfs2_create_inode - Create a new inode 590 * @dir: The parent directory 591 * @dentry: The new dentry 592 * @file: If non-NULL, the file which is being opened 593 * @mode: The permissions on the new inode 594 * @dev: For device nodes, this is the device number 595 * @symname: For symlinks, this is the link destination 596 * @size: The initial size of the inode (ignored for directories) 597 * 598 * Returns: 0 on success, or error code 599 */ 600 601 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 602 struct file *file, 603 umode_t mode, dev_t dev, const char *symname, 604 unsigned int size, int excl) 605 { 606 const struct qstr *name = &dentry->d_name; 607 struct posix_acl *default_acl, *acl; 608 struct gfs2_holder ghs[2]; 609 struct inode *inode = NULL; 610 struct gfs2_inode *dip = GFS2_I(dir), *ip; 611 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 612 struct gfs2_glock *io_gl; 613 int error, free_vfs_inode = 1; 614 u32 aflags = 0; 615 unsigned blocks = 1; 616 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 617 618 if (!name->len || name->len > GFS2_FNAMESIZE) 619 return -ENAMETOOLONG; 620 621 error = gfs2_qa_get(dip); 622 if (error) 623 return error; 624 625 error = gfs2_rindex_update(sdp); 626 if (error) 627 goto fail; 628 629 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 630 if (error) 631 goto fail; 632 gfs2_holder_mark_uninitialized(ghs + 1); 633 634 error = create_ok(dip, name, mode); 635 if (error) 636 goto fail_gunlock; 637 638 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 639 error = PTR_ERR(inode); 640 if (!IS_ERR(inode)) { 641 if (S_ISDIR(inode->i_mode)) { 642 iput(inode); 643 inode = ERR_PTR(-EISDIR); 644 goto fail_gunlock; 645 } 646 d_instantiate(dentry, inode); 647 error = 0; 648 if (file) { 649 if (S_ISREG(inode->i_mode)) 650 error = finish_open(file, dentry, gfs2_open_common); 651 else 652 error = finish_no_open(file, NULL); 653 } 654 gfs2_glock_dq_uninit(ghs); 655 goto fail; 656 } else if (error != -ENOENT) { 657 goto fail_gunlock; 658 } 659 660 error = gfs2_diradd_alloc_required(dir, name, &da); 661 if (error < 0) 662 goto fail_gunlock; 663 664 inode = new_inode(sdp->sd_vfs); 665 error = -ENOMEM; 666 if (!inode) 667 goto fail_gunlock; 668 669 error = posix_acl_create(dir, &mode, &default_acl, &acl); 670 if (error) 671 goto fail_gunlock; 672 673 ip = GFS2_I(inode); 674 error = gfs2_qa_get(ip); 675 if (error) 676 goto fail_free_acls; 677 678 inode->i_mode = mode; 679 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 680 inode->i_rdev = dev; 681 inode->i_size = size; 682 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 683 munge_mode_uid_gid(dip, inode); 684 check_and_update_goal(dip); 685 ip->i_goal = dip->i_goal; 686 ip->i_diskflags = 0; 687 ip->i_eattr = 0; 688 ip->i_height = 0; 689 ip->i_depth = 0; 690 ip->i_entries = 0; 691 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 692 693 switch(mode & S_IFMT) { 694 case S_IFREG: 695 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 696 gfs2_tune_get(sdp, gt_new_files_jdata)) 697 ip->i_diskflags |= GFS2_DIF_JDATA; 698 gfs2_set_aops(inode); 699 break; 700 case S_IFDIR: 701 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 702 ip->i_diskflags |= GFS2_DIF_JDATA; 703 ip->i_entries = 2; 704 break; 705 } 706 707 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 708 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 709 ip->i_diskflags |= GFS2_DIF_SYSTEM; 710 711 gfs2_set_inode_flags(inode); 712 713 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 714 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 715 aflags |= GFS2_AF_ORLOV; 716 717 if (default_acl || acl) 718 blocks++; 719 720 error = alloc_dinode(ip, aflags, &blocks); 721 if (error) 722 goto fail_free_inode; 723 724 gfs2_set_inode_blocks(inode, blocks); 725 726 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 727 if (error) 728 goto fail_free_inode; 729 flush_delayed_work(&ip->i_gl->gl_work); 730 glock_set_object(ip->i_gl, ip); 731 732 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 733 if (error) 734 goto fail_free_inode; 735 gfs2_cancel_delete_work(io_gl); 736 glock_set_object(io_gl, ip); 737 738 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 739 if (error) 740 goto fail_gunlock2; 741 742 error = gfs2_trans_begin(sdp, blocks, 0); 743 if (error) 744 goto fail_gunlock2; 745 746 if (blocks > 1) { 747 ip->i_eattr = ip->i_no_addr + 1; 748 gfs2_init_xattr(ip); 749 } 750 init_dinode(dip, ip, symname); 751 gfs2_trans_end(sdp); 752 753 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 754 if (error) 755 goto fail_gunlock2; 756 757 gfs2_set_iop(inode); 758 insert_inode_hash(inode); 759 760 free_vfs_inode = 0; /* After this point, the inode is no longer 761 considered free. Any failures need to undo 762 the gfs2 structures. */ 763 if (default_acl) { 764 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 765 if (error) 766 goto fail_gunlock3; 767 posix_acl_release(default_acl); 768 default_acl = NULL; 769 } 770 if (acl) { 771 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 772 if (error) 773 goto fail_gunlock3; 774 posix_acl_release(acl); 775 acl = NULL; 776 } 777 778 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 779 &gfs2_initxattrs, NULL); 780 if (error) 781 goto fail_gunlock3; 782 783 error = link_dinode(dip, name, ip, &da); 784 if (error) 785 goto fail_gunlock3; 786 787 mark_inode_dirty(inode); 788 d_instantiate(dentry, inode); 789 /* After instantiate, errors should result in evict which will destroy 790 * both inode and iopen glocks properly. */ 791 if (file) { 792 file->f_mode |= FMODE_CREATED; 793 error = finish_open(file, dentry, gfs2_open_common); 794 } 795 gfs2_glock_dq_uninit(ghs); 796 gfs2_qa_put(ip); 797 gfs2_glock_dq_uninit(ghs + 1); 798 gfs2_glock_put(io_gl); 799 gfs2_qa_put(dip); 800 return error; 801 802 fail_gunlock3: 803 glock_clear_object(io_gl, ip); 804 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 805 fail_gunlock2: 806 glock_clear_object(io_gl, ip); 807 gfs2_glock_put(io_gl); 808 fail_free_inode: 809 if (ip->i_gl) { 810 glock_clear_object(ip->i_gl, ip); 811 if (free_vfs_inode) /* else evict will do the put for us */ 812 gfs2_glock_put(ip->i_gl); 813 } 814 gfs2_rs_delete(ip, NULL); 815 gfs2_qa_put(ip); 816 fail_free_acls: 817 posix_acl_release(default_acl); 818 posix_acl_release(acl); 819 fail_gunlock: 820 gfs2_dir_no_add(&da); 821 gfs2_glock_dq_uninit(ghs); 822 if (!IS_ERR_OR_NULL(inode)) { 823 clear_nlink(inode); 824 if (!free_vfs_inode) 825 mark_inode_dirty(inode); 826 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 827 &GFS2_I(inode)->i_flags); 828 iput(inode); 829 } 830 if (gfs2_holder_initialized(ghs + 1)) 831 gfs2_glock_dq_uninit(ghs + 1); 832 fail: 833 gfs2_qa_put(dip); 834 return error; 835 } 836 837 /** 838 * gfs2_create - Create a file 839 * @dir: The directory in which to create the file 840 * @dentry: The dentry of the new file 841 * @mode: The mode of the new file 842 * 843 * Returns: errno 844 */ 845 846 static int gfs2_create(struct inode *dir, struct dentry *dentry, 847 umode_t mode, bool excl) 848 { 849 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 850 } 851 852 /** 853 * __gfs2_lookup - Look up a filename in a directory and return its inode 854 * @dir: The directory inode 855 * @dentry: The dentry of the new inode 856 * @file: File to be opened 857 * 858 * 859 * Returns: errno 860 */ 861 862 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 863 struct file *file) 864 { 865 struct inode *inode; 866 struct dentry *d; 867 struct gfs2_holder gh; 868 struct gfs2_glock *gl; 869 int error; 870 871 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 872 if (inode == NULL) { 873 d_add(dentry, NULL); 874 return NULL; 875 } 876 if (IS_ERR(inode)) 877 return ERR_CAST(inode); 878 879 gl = GFS2_I(inode)->i_gl; 880 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 881 if (error) { 882 iput(inode); 883 return ERR_PTR(error); 884 } 885 886 d = d_splice_alias(inode, dentry); 887 if (IS_ERR(d)) { 888 gfs2_glock_dq_uninit(&gh); 889 return d; 890 } 891 if (file && S_ISREG(inode->i_mode)) 892 error = finish_open(file, dentry, gfs2_open_common); 893 894 gfs2_glock_dq_uninit(&gh); 895 if (error) { 896 dput(d); 897 return ERR_PTR(error); 898 } 899 return d; 900 } 901 902 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 903 unsigned flags) 904 { 905 return __gfs2_lookup(dir, dentry, NULL); 906 } 907 908 /** 909 * gfs2_link - Link to a file 910 * @old_dentry: The inode to link 911 * @dir: Add link to this directory 912 * @dentry: The name of the link 913 * 914 * Link the inode in "old_dentry" into the directory "dir" with the 915 * name in "dentry". 916 * 917 * Returns: errno 918 */ 919 920 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 921 struct dentry *dentry) 922 { 923 struct gfs2_inode *dip = GFS2_I(dir); 924 struct gfs2_sbd *sdp = GFS2_SB(dir); 925 struct inode *inode = d_inode(old_dentry); 926 struct gfs2_inode *ip = GFS2_I(inode); 927 struct gfs2_holder ghs[2]; 928 struct buffer_head *dibh; 929 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 930 int error; 931 932 if (S_ISDIR(inode->i_mode)) 933 return -EPERM; 934 935 error = gfs2_qa_get(dip); 936 if (error) 937 return error; 938 939 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 940 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 941 942 error = gfs2_glock_nq(ghs); /* parent */ 943 if (error) 944 goto out_parent; 945 946 error = gfs2_glock_nq(ghs + 1); /* child */ 947 if (error) 948 goto out_child; 949 950 error = -ENOENT; 951 if (inode->i_nlink == 0) 952 goto out_gunlock; 953 954 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 955 if (error) 956 goto out_gunlock; 957 958 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 959 switch (error) { 960 case -ENOENT: 961 break; 962 case 0: 963 error = -EEXIST; 964 default: 965 goto out_gunlock; 966 } 967 968 error = -EINVAL; 969 if (!dip->i_inode.i_nlink) 970 goto out_gunlock; 971 error = -EFBIG; 972 if (dip->i_entries == (u32)-1) 973 goto out_gunlock; 974 error = -EPERM; 975 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 976 goto out_gunlock; 977 error = -EINVAL; 978 if (!ip->i_inode.i_nlink) 979 goto out_gunlock; 980 error = -EMLINK; 981 if (ip->i_inode.i_nlink == (u32)-1) 982 goto out_gunlock; 983 984 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 985 if (error < 0) 986 goto out_gunlock; 987 988 if (da.nr_blocks) { 989 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 990 error = gfs2_quota_lock_check(dip, &ap); 991 if (error) 992 goto out_gunlock; 993 994 error = gfs2_inplace_reserve(dip, &ap); 995 if (error) 996 goto out_gunlock_q; 997 998 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 999 if (error) 1000 goto out_ipres; 1001 } else { 1002 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1003 if (error) 1004 goto out_ipres; 1005 } 1006 1007 error = gfs2_meta_inode_buffer(ip, &dibh); 1008 if (error) 1009 goto out_end_trans; 1010 1011 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1012 if (error) 1013 goto out_brelse; 1014 1015 gfs2_trans_add_meta(ip->i_gl, dibh); 1016 inc_nlink(&ip->i_inode); 1017 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1018 ihold(inode); 1019 d_instantiate(dentry, inode); 1020 mark_inode_dirty(inode); 1021 1022 out_brelse: 1023 brelse(dibh); 1024 out_end_trans: 1025 gfs2_trans_end(sdp); 1026 out_ipres: 1027 if (da.nr_blocks) 1028 gfs2_inplace_release(dip); 1029 out_gunlock_q: 1030 if (da.nr_blocks) 1031 gfs2_quota_unlock(dip); 1032 out_gunlock: 1033 gfs2_dir_no_add(&da); 1034 gfs2_glock_dq(ghs + 1); 1035 out_child: 1036 gfs2_glock_dq(ghs); 1037 out_parent: 1038 gfs2_qa_put(dip); 1039 gfs2_holder_uninit(ghs); 1040 gfs2_holder_uninit(ghs + 1); 1041 return error; 1042 } 1043 1044 /* 1045 * gfs2_unlink_ok - check to see that a inode is still in a directory 1046 * @dip: the directory 1047 * @name: the name of the file 1048 * @ip: the inode 1049 * 1050 * Assumes that the lock on (at least) @dip is held. 1051 * 1052 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1053 */ 1054 1055 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1056 const struct gfs2_inode *ip) 1057 { 1058 int error; 1059 1060 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1061 return -EPERM; 1062 1063 if ((dip->i_inode.i_mode & S_ISVTX) && 1064 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1065 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1066 return -EPERM; 1067 1068 if (IS_APPEND(&dip->i_inode)) 1069 return -EPERM; 1070 1071 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 1072 if (error) 1073 return error; 1074 1075 return gfs2_dir_check(&dip->i_inode, name, ip); 1076 } 1077 1078 /** 1079 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1080 * @dip: The parent directory 1081 * @name: The name of the entry in the parent directory 1082 * @inode: The inode to be removed 1083 * 1084 * Called with all the locks and in a transaction. This will only be 1085 * called for a directory after it has been checked to ensure it is empty. 1086 * 1087 * Returns: 0 on success, or an error 1088 */ 1089 1090 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1091 const struct dentry *dentry) 1092 { 1093 struct inode *inode = d_inode(dentry); 1094 struct gfs2_inode *ip = GFS2_I(inode); 1095 int error; 1096 1097 error = gfs2_dir_del(dip, dentry); 1098 if (error) 1099 return error; 1100 1101 ip->i_entries = 0; 1102 inode->i_ctime = current_time(inode); 1103 if (S_ISDIR(inode->i_mode)) 1104 clear_nlink(inode); 1105 else 1106 drop_nlink(inode); 1107 mark_inode_dirty(inode); 1108 if (inode->i_nlink == 0) 1109 gfs2_unlink_di(inode); 1110 return 0; 1111 } 1112 1113 1114 /** 1115 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1116 * @dir: The inode of the directory containing the inode to unlink 1117 * @dentry: The file itself 1118 * 1119 * This routine uses the type of the inode as a flag to figure out 1120 * whether this is an unlink or an rmdir. 1121 * 1122 * Returns: errno 1123 */ 1124 1125 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1126 { 1127 struct gfs2_inode *dip = GFS2_I(dir); 1128 struct gfs2_sbd *sdp = GFS2_SB(dir); 1129 struct inode *inode = d_inode(dentry); 1130 struct gfs2_inode *ip = GFS2_I(inode); 1131 struct gfs2_holder ghs[3]; 1132 struct gfs2_rgrpd *rgd; 1133 int error; 1134 1135 error = gfs2_rindex_update(sdp); 1136 if (error) 1137 return error; 1138 1139 error = -EROFS; 1140 1141 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1142 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1143 1144 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1145 if (!rgd) 1146 goto out_inodes; 1147 1148 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1149 1150 1151 error = gfs2_glock_nq(ghs); /* parent */ 1152 if (error) 1153 goto out_parent; 1154 1155 error = gfs2_glock_nq(ghs + 1); /* child */ 1156 if (error) 1157 goto out_child; 1158 1159 error = -ENOENT; 1160 if (inode->i_nlink == 0) 1161 goto out_rgrp; 1162 1163 if (S_ISDIR(inode->i_mode)) { 1164 error = -ENOTEMPTY; 1165 if (ip->i_entries > 2 || inode->i_nlink > 2) 1166 goto out_rgrp; 1167 } 1168 1169 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1170 if (error) 1171 goto out_rgrp; 1172 1173 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1174 if (error) 1175 goto out_gunlock; 1176 1177 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1178 if (error) 1179 goto out_gunlock; 1180 1181 error = gfs2_unlink_inode(dip, dentry); 1182 gfs2_trans_end(sdp); 1183 1184 out_gunlock: 1185 gfs2_glock_dq(ghs + 2); 1186 out_rgrp: 1187 gfs2_glock_dq(ghs + 1); 1188 out_child: 1189 gfs2_glock_dq(ghs); 1190 out_parent: 1191 gfs2_holder_uninit(ghs + 2); 1192 out_inodes: 1193 gfs2_holder_uninit(ghs + 1); 1194 gfs2_holder_uninit(ghs); 1195 return error; 1196 } 1197 1198 /** 1199 * gfs2_symlink - Create a symlink 1200 * @dir: The directory to create the symlink in 1201 * @dentry: The dentry to put the symlink in 1202 * @symname: The thing which the link points to 1203 * 1204 * Returns: errno 1205 */ 1206 1207 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1208 const char *symname) 1209 { 1210 unsigned int size; 1211 1212 size = strlen(symname); 1213 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1214 return -ENAMETOOLONG; 1215 1216 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1217 } 1218 1219 /** 1220 * gfs2_mkdir - Make a directory 1221 * @dir: The parent directory of the new one 1222 * @dentry: The dentry of the new directory 1223 * @mode: The mode of the new directory 1224 * 1225 * Returns: errno 1226 */ 1227 1228 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1229 { 1230 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1231 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1232 } 1233 1234 /** 1235 * gfs2_mknod - Make a special file 1236 * @dir: The directory in which the special file will reside 1237 * @dentry: The dentry of the special file 1238 * @mode: The mode of the special file 1239 * @dev: The device specification of the special file 1240 * 1241 */ 1242 1243 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1244 dev_t dev) 1245 { 1246 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1247 } 1248 1249 /** 1250 * gfs2_atomic_open - Atomically open a file 1251 * @dir: The directory 1252 * @dentry: The proposed new entry 1253 * @file: The proposed new struct file 1254 * @flags: open flags 1255 * @mode: File mode 1256 * 1257 * Returns: error code or 0 for success 1258 */ 1259 1260 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1261 struct file *file, unsigned flags, 1262 umode_t mode) 1263 { 1264 struct dentry *d; 1265 bool excl = !!(flags & O_EXCL); 1266 1267 if (!d_in_lookup(dentry)) 1268 goto skip_lookup; 1269 1270 d = __gfs2_lookup(dir, dentry, file); 1271 if (IS_ERR(d)) 1272 return PTR_ERR(d); 1273 if (d != NULL) 1274 dentry = d; 1275 if (d_really_is_positive(dentry)) { 1276 if (!(file->f_mode & FMODE_OPENED)) 1277 return finish_no_open(file, d); 1278 dput(d); 1279 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1280 } 1281 1282 BUG_ON(d != NULL); 1283 1284 skip_lookup: 1285 if (!(flags & O_CREAT)) 1286 return -ENOENT; 1287 1288 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1289 } 1290 1291 /* 1292 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1293 * @this: move this 1294 * @to: to here 1295 * 1296 * Follow @to back to the root and make sure we don't encounter @this 1297 * Assumes we already hold the rename lock. 1298 * 1299 * Returns: errno 1300 */ 1301 1302 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1303 { 1304 struct inode *dir = &to->i_inode; 1305 struct super_block *sb = dir->i_sb; 1306 struct inode *tmp; 1307 int error = 0; 1308 1309 igrab(dir); 1310 1311 for (;;) { 1312 if (dir == &this->i_inode) { 1313 error = -EINVAL; 1314 break; 1315 } 1316 if (dir == d_inode(sb->s_root)) { 1317 error = 0; 1318 break; 1319 } 1320 1321 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1322 if (!tmp) { 1323 error = -ENOENT; 1324 break; 1325 } 1326 if (IS_ERR(tmp)) { 1327 error = PTR_ERR(tmp); 1328 break; 1329 } 1330 1331 iput(dir); 1332 dir = tmp; 1333 } 1334 1335 iput(dir); 1336 1337 return error; 1338 } 1339 1340 /** 1341 * update_moved_ino - Update an inode that's being moved 1342 * @ip: The inode being moved 1343 * @ndip: The parent directory of the new filename 1344 * @dir_rename: True of ip is a directory 1345 * 1346 * Returns: errno 1347 */ 1348 1349 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1350 int dir_rename) 1351 { 1352 if (dir_rename) 1353 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1354 1355 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1356 mark_inode_dirty_sync(&ip->i_inode); 1357 return 0; 1358 } 1359 1360 1361 /** 1362 * gfs2_rename - Rename a file 1363 * @odir: Parent directory of old file name 1364 * @odentry: The old dentry of the file 1365 * @ndir: Parent directory of new file name 1366 * @ndentry: The new dentry of the file 1367 * 1368 * Returns: errno 1369 */ 1370 1371 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1372 struct inode *ndir, struct dentry *ndentry) 1373 { 1374 struct gfs2_inode *odip = GFS2_I(odir); 1375 struct gfs2_inode *ndip = GFS2_I(ndir); 1376 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1377 struct gfs2_inode *nip = NULL; 1378 struct gfs2_sbd *sdp = GFS2_SB(odir); 1379 struct gfs2_holder ghs[4], r_gh, rd_gh; 1380 struct gfs2_rgrpd *nrgd; 1381 unsigned int num_gh; 1382 int dir_rename = 0; 1383 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1384 unsigned int x; 1385 int error; 1386 1387 gfs2_holder_mark_uninitialized(&r_gh); 1388 gfs2_holder_mark_uninitialized(&rd_gh); 1389 if (d_really_is_positive(ndentry)) { 1390 nip = GFS2_I(d_inode(ndentry)); 1391 if (ip == nip) 1392 return 0; 1393 } 1394 1395 error = gfs2_rindex_update(sdp); 1396 if (error) 1397 return error; 1398 1399 error = gfs2_qa_get(ndip); 1400 if (error) 1401 return error; 1402 1403 if (odip != ndip) { 1404 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1405 0, &r_gh); 1406 if (error) 1407 goto out; 1408 1409 if (S_ISDIR(ip->i_inode.i_mode)) { 1410 dir_rename = 1; 1411 /* don't move a directory into its subdir */ 1412 error = gfs2_ok_to_move(ip, ndip); 1413 if (error) 1414 goto out_gunlock_r; 1415 } 1416 } 1417 1418 num_gh = 1; 1419 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1420 if (odip != ndip) { 1421 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1422 ghs + num_gh); 1423 num_gh++; 1424 } 1425 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1426 num_gh++; 1427 1428 if (nip) { 1429 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1430 ghs + num_gh); 1431 num_gh++; 1432 } 1433 1434 for (x = 0; x < num_gh; x++) { 1435 error = gfs2_glock_nq(ghs + x); 1436 if (error) 1437 goto out_gunlock; 1438 } 1439 error = gfs2_glock_async_wait(num_gh, ghs); 1440 if (error) 1441 goto out_gunlock; 1442 1443 if (nip) { 1444 /* Grab the resource group glock for unlink flag twiddling. 1445 * This is the case where the target dinode already exists 1446 * so we unlink before doing the rename. 1447 */ 1448 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1449 if (!nrgd) { 1450 error = -ENOENT; 1451 goto out_gunlock; 1452 } 1453 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, 1454 &rd_gh); 1455 if (error) 1456 goto out_gunlock; 1457 } 1458 1459 error = -ENOENT; 1460 if (ip->i_inode.i_nlink == 0) 1461 goto out_gunlock; 1462 1463 /* Check out the old directory */ 1464 1465 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1466 if (error) 1467 goto out_gunlock; 1468 1469 /* Check out the new directory */ 1470 1471 if (nip) { 1472 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1473 if (error) 1474 goto out_gunlock; 1475 1476 if (nip->i_inode.i_nlink == 0) { 1477 error = -EAGAIN; 1478 goto out_gunlock; 1479 } 1480 1481 if (S_ISDIR(nip->i_inode.i_mode)) { 1482 if (nip->i_entries < 2) { 1483 gfs2_consist_inode(nip); 1484 error = -EIO; 1485 goto out_gunlock; 1486 } 1487 if (nip->i_entries > 2) { 1488 error = -ENOTEMPTY; 1489 goto out_gunlock; 1490 } 1491 } 1492 } else { 1493 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1494 if (error) 1495 goto out_gunlock; 1496 1497 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1498 switch (error) { 1499 case -ENOENT: 1500 error = 0; 1501 break; 1502 case 0: 1503 error = -EEXIST; 1504 default: 1505 goto out_gunlock; 1506 } 1507 1508 if (odip != ndip) { 1509 if (!ndip->i_inode.i_nlink) { 1510 error = -ENOENT; 1511 goto out_gunlock; 1512 } 1513 if (ndip->i_entries == (u32)-1) { 1514 error = -EFBIG; 1515 goto out_gunlock; 1516 } 1517 if (S_ISDIR(ip->i_inode.i_mode) && 1518 ndip->i_inode.i_nlink == (u32)-1) { 1519 error = -EMLINK; 1520 goto out_gunlock; 1521 } 1522 } 1523 } 1524 1525 /* Check out the dir to be renamed */ 1526 1527 if (dir_rename) { 1528 error = gfs2_permission(d_inode(odentry), MAY_WRITE); 1529 if (error) 1530 goto out_gunlock; 1531 } 1532 1533 if (nip == NULL) { 1534 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1535 if (error) 1536 goto out_gunlock; 1537 } 1538 1539 if (da.nr_blocks) { 1540 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1541 error = gfs2_quota_lock_check(ndip, &ap); 1542 if (error) 1543 goto out_gunlock; 1544 1545 error = gfs2_inplace_reserve(ndip, &ap); 1546 if (error) 1547 goto out_gunlock_q; 1548 1549 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1550 4 * RES_LEAF + 4, 0); 1551 if (error) 1552 goto out_ipreserv; 1553 } else { 1554 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1555 5 * RES_LEAF + 4, 0); 1556 if (error) 1557 goto out_gunlock; 1558 } 1559 1560 /* Remove the target file, if it exists */ 1561 1562 if (nip) 1563 error = gfs2_unlink_inode(ndip, ndentry); 1564 1565 error = update_moved_ino(ip, ndip, dir_rename); 1566 if (error) 1567 goto out_end_trans; 1568 1569 error = gfs2_dir_del(odip, odentry); 1570 if (error) 1571 goto out_end_trans; 1572 1573 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1574 if (error) 1575 goto out_end_trans; 1576 1577 out_end_trans: 1578 gfs2_trans_end(sdp); 1579 out_ipreserv: 1580 if (da.nr_blocks) 1581 gfs2_inplace_release(ndip); 1582 out_gunlock_q: 1583 if (da.nr_blocks) 1584 gfs2_quota_unlock(ndip); 1585 out_gunlock: 1586 gfs2_dir_no_add(&da); 1587 if (gfs2_holder_initialized(&rd_gh)) 1588 gfs2_glock_dq_uninit(&rd_gh); 1589 1590 while (x--) { 1591 if (gfs2_holder_queued(ghs + x)) 1592 gfs2_glock_dq(ghs + x); 1593 gfs2_holder_uninit(ghs + x); 1594 } 1595 out_gunlock_r: 1596 if (gfs2_holder_initialized(&r_gh)) 1597 gfs2_glock_dq_uninit(&r_gh); 1598 out: 1599 gfs2_qa_put(ndip); 1600 return error; 1601 } 1602 1603 /** 1604 * gfs2_exchange - exchange two files 1605 * @odir: Parent directory of old file name 1606 * @odentry: The old dentry of the file 1607 * @ndir: Parent directory of new file name 1608 * @ndentry: The new dentry of the file 1609 * @flags: The rename flags 1610 * 1611 * Returns: errno 1612 */ 1613 1614 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1615 struct inode *ndir, struct dentry *ndentry, 1616 unsigned int flags) 1617 { 1618 struct gfs2_inode *odip = GFS2_I(odir); 1619 struct gfs2_inode *ndip = GFS2_I(ndir); 1620 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1621 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1622 struct gfs2_sbd *sdp = GFS2_SB(odir); 1623 struct gfs2_holder ghs[4], r_gh; 1624 unsigned int num_gh; 1625 unsigned int x; 1626 umode_t old_mode = oip->i_inode.i_mode; 1627 umode_t new_mode = nip->i_inode.i_mode; 1628 int error; 1629 1630 gfs2_holder_mark_uninitialized(&r_gh); 1631 error = gfs2_rindex_update(sdp); 1632 if (error) 1633 return error; 1634 1635 if (odip != ndip) { 1636 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1637 0, &r_gh); 1638 if (error) 1639 goto out; 1640 1641 if (S_ISDIR(old_mode)) { 1642 /* don't move a directory into its subdir */ 1643 error = gfs2_ok_to_move(oip, ndip); 1644 if (error) 1645 goto out_gunlock_r; 1646 } 1647 1648 if (S_ISDIR(new_mode)) { 1649 /* don't move a directory into its subdir */ 1650 error = gfs2_ok_to_move(nip, odip); 1651 if (error) 1652 goto out_gunlock_r; 1653 } 1654 } 1655 1656 num_gh = 1; 1657 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1658 if (odip != ndip) { 1659 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1660 ghs + num_gh); 1661 num_gh++; 1662 } 1663 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1664 num_gh++; 1665 1666 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1667 num_gh++; 1668 1669 for (x = 0; x < num_gh; x++) { 1670 error = gfs2_glock_nq(ghs + x); 1671 if (error) 1672 goto out_gunlock; 1673 } 1674 1675 error = gfs2_glock_async_wait(num_gh, ghs); 1676 if (error) 1677 goto out_gunlock; 1678 1679 error = -ENOENT; 1680 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1681 goto out_gunlock; 1682 1683 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1684 if (error) 1685 goto out_gunlock; 1686 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1687 if (error) 1688 goto out_gunlock; 1689 1690 if (S_ISDIR(old_mode)) { 1691 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1692 if (error) 1693 goto out_gunlock; 1694 } 1695 if (S_ISDIR(new_mode)) { 1696 error = gfs2_permission(ndentry->d_inode, MAY_WRITE); 1697 if (error) 1698 goto out_gunlock; 1699 } 1700 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1701 if (error) 1702 goto out_gunlock; 1703 1704 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1705 if (error) 1706 goto out_end_trans; 1707 1708 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1709 if (error) 1710 goto out_end_trans; 1711 1712 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1713 IF2DT(old_mode)); 1714 if (error) 1715 goto out_end_trans; 1716 1717 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1718 IF2DT(new_mode)); 1719 if (error) 1720 goto out_end_trans; 1721 1722 if (odip != ndip) { 1723 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1724 inc_nlink(&odip->i_inode); 1725 drop_nlink(&ndip->i_inode); 1726 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1727 inc_nlink(&ndip->i_inode); 1728 drop_nlink(&odip->i_inode); 1729 } 1730 } 1731 mark_inode_dirty(&ndip->i_inode); 1732 if (odip != ndip) 1733 mark_inode_dirty(&odip->i_inode); 1734 1735 out_end_trans: 1736 gfs2_trans_end(sdp); 1737 out_gunlock: 1738 while (x--) { 1739 if (gfs2_holder_queued(ghs + x)) 1740 gfs2_glock_dq(ghs + x); 1741 gfs2_holder_uninit(ghs + x); 1742 } 1743 out_gunlock_r: 1744 if (gfs2_holder_initialized(&r_gh)) 1745 gfs2_glock_dq_uninit(&r_gh); 1746 out: 1747 return error; 1748 } 1749 1750 static int gfs2_rename2(struct inode *odir, struct dentry *odentry, 1751 struct inode *ndir, struct dentry *ndentry, 1752 unsigned int flags) 1753 { 1754 flags &= ~RENAME_NOREPLACE; 1755 1756 if (flags & ~RENAME_EXCHANGE) 1757 return -EINVAL; 1758 1759 if (flags & RENAME_EXCHANGE) 1760 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1761 1762 return gfs2_rename(odir, odentry, ndir, ndentry); 1763 } 1764 1765 /** 1766 * gfs2_get_link - Follow a symbolic link 1767 * @dentry: The dentry of the link 1768 * @inode: The inode of the link 1769 * @done: destructor for return value 1770 * 1771 * This can handle symlinks of any size. 1772 * 1773 * Returns: 0 on success or error code 1774 */ 1775 1776 static const char *gfs2_get_link(struct dentry *dentry, 1777 struct inode *inode, 1778 struct delayed_call *done) 1779 { 1780 struct gfs2_inode *ip = GFS2_I(inode); 1781 struct gfs2_holder i_gh; 1782 struct buffer_head *dibh; 1783 unsigned int size; 1784 char *buf; 1785 int error; 1786 1787 if (!dentry) 1788 return ERR_PTR(-ECHILD); 1789 1790 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1791 error = gfs2_glock_nq(&i_gh); 1792 if (error) { 1793 gfs2_holder_uninit(&i_gh); 1794 return ERR_PTR(error); 1795 } 1796 1797 size = (unsigned int)i_size_read(&ip->i_inode); 1798 if (size == 0) { 1799 gfs2_consist_inode(ip); 1800 buf = ERR_PTR(-EIO); 1801 goto out; 1802 } 1803 1804 error = gfs2_meta_inode_buffer(ip, &dibh); 1805 if (error) { 1806 buf = ERR_PTR(error); 1807 goto out; 1808 } 1809 1810 buf = kzalloc(size + 1, GFP_NOFS); 1811 if (!buf) 1812 buf = ERR_PTR(-ENOMEM); 1813 else 1814 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1815 brelse(dibh); 1816 out: 1817 gfs2_glock_dq_uninit(&i_gh); 1818 if (!IS_ERR(buf)) 1819 set_delayed_call(done, kfree_link, buf); 1820 return buf; 1821 } 1822 1823 /** 1824 * gfs2_permission - 1825 * @inode: The inode 1826 * @mask: The mask to be tested 1827 * @flags: Indicates whether this is an RCU path walk or not 1828 * 1829 * This may be called from the VFS directly, or from within GFS2 with the 1830 * inode locked, so we look to see if the glock is already locked and only 1831 * lock the glock if its not already been done. 1832 * 1833 * Returns: errno 1834 */ 1835 1836 int gfs2_permission(struct inode *inode, int mask) 1837 { 1838 struct gfs2_inode *ip; 1839 struct gfs2_holder i_gh; 1840 int error; 1841 1842 gfs2_holder_mark_uninitialized(&i_gh); 1843 ip = GFS2_I(inode); 1844 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1845 if (mask & MAY_NOT_BLOCK) 1846 return -ECHILD; 1847 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1848 if (error) 1849 return error; 1850 } 1851 1852 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1853 error = -EPERM; 1854 else 1855 error = generic_permission(inode, mask); 1856 if (gfs2_holder_initialized(&i_gh)) 1857 gfs2_glock_dq_uninit(&i_gh); 1858 1859 return error; 1860 } 1861 1862 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1863 { 1864 setattr_copy(inode, attr); 1865 mark_inode_dirty(inode); 1866 return 0; 1867 } 1868 1869 /** 1870 * gfs2_setattr_simple - 1871 * @ip: 1872 * @attr: 1873 * 1874 * Returns: errno 1875 */ 1876 1877 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1878 { 1879 int error; 1880 1881 if (current->journal_info) 1882 return __gfs2_setattr_simple(inode, attr); 1883 1884 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1885 if (error) 1886 return error; 1887 1888 error = __gfs2_setattr_simple(inode, attr); 1889 gfs2_trans_end(GFS2_SB(inode)); 1890 return error; 1891 } 1892 1893 static int setattr_chown(struct inode *inode, struct iattr *attr) 1894 { 1895 struct gfs2_inode *ip = GFS2_I(inode); 1896 struct gfs2_sbd *sdp = GFS2_SB(inode); 1897 kuid_t ouid, nuid; 1898 kgid_t ogid, ngid; 1899 int error; 1900 struct gfs2_alloc_parms ap; 1901 1902 ouid = inode->i_uid; 1903 ogid = inode->i_gid; 1904 nuid = attr->ia_uid; 1905 ngid = attr->ia_gid; 1906 1907 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1908 ouid = nuid = NO_UID_QUOTA_CHANGE; 1909 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1910 ogid = ngid = NO_GID_QUOTA_CHANGE; 1911 error = gfs2_qa_get(ip); 1912 if (error) 1913 return error; 1914 1915 error = gfs2_rindex_update(sdp); 1916 if (error) 1917 goto out; 1918 1919 error = gfs2_quota_lock(ip, nuid, ngid); 1920 if (error) 1921 goto out; 1922 1923 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1924 1925 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1926 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1927 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1928 if (error) 1929 goto out_gunlock_q; 1930 } 1931 1932 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1933 if (error) 1934 goto out_gunlock_q; 1935 1936 error = gfs2_setattr_simple(inode, attr); 1937 if (error) 1938 goto out_end_trans; 1939 1940 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1941 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1942 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1943 gfs2_quota_change(ip, ap.target, nuid, ngid); 1944 } 1945 1946 out_end_trans: 1947 gfs2_trans_end(sdp); 1948 out_gunlock_q: 1949 gfs2_quota_unlock(ip); 1950 out: 1951 gfs2_qa_put(ip); 1952 return error; 1953 } 1954 1955 /** 1956 * gfs2_setattr - Change attributes on an inode 1957 * @dentry: The dentry which is changing 1958 * @attr: The structure describing the change 1959 * 1960 * The VFS layer wants to change one or more of an inodes attributes. Write 1961 * that change out to disk. 1962 * 1963 * Returns: errno 1964 */ 1965 1966 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1967 { 1968 struct inode *inode = d_inode(dentry); 1969 struct gfs2_inode *ip = GFS2_I(inode); 1970 struct gfs2_holder i_gh; 1971 int error; 1972 1973 error = gfs2_qa_get(ip); 1974 if (error) 1975 return error; 1976 1977 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1978 if (error) 1979 goto out; 1980 1981 error = -EPERM; 1982 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1983 goto error; 1984 1985 error = setattr_prepare(dentry, attr); 1986 if (error) 1987 goto error; 1988 1989 if (attr->ia_valid & ATTR_SIZE) 1990 error = gfs2_setattr_size(inode, attr->ia_size); 1991 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1992 error = setattr_chown(inode, attr); 1993 else { 1994 error = gfs2_setattr_simple(inode, attr); 1995 if (!error && attr->ia_valid & ATTR_MODE) 1996 error = posix_acl_chmod(inode, inode->i_mode); 1997 } 1998 1999 error: 2000 if (!error) 2001 mark_inode_dirty(inode); 2002 gfs2_glock_dq_uninit(&i_gh); 2003 out: 2004 gfs2_qa_put(ip); 2005 return error; 2006 } 2007 2008 /** 2009 * gfs2_getattr - Read out an inode's attributes 2010 * @path: Object to query 2011 * @stat: The inode's stats 2012 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2013 * @flags: AT_STATX_xxx setting 2014 * 2015 * This may be called from the VFS directly, or from within GFS2 with the 2016 * inode locked, so we look to see if the glock is already locked and only 2017 * lock the glock if its not already been done. Note that its the NFS 2018 * readdirplus operation which causes this to be called (from filldir) 2019 * with the glock already held. 2020 * 2021 * Returns: errno 2022 */ 2023 2024 static int gfs2_getattr(const struct path *path, struct kstat *stat, 2025 u32 request_mask, unsigned int flags) 2026 { 2027 struct inode *inode = d_inode(path->dentry); 2028 struct gfs2_inode *ip = GFS2_I(inode); 2029 struct gfs2_holder gh; 2030 u32 gfsflags; 2031 int error; 2032 2033 gfs2_holder_mark_uninitialized(&gh); 2034 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2035 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2036 if (error) 2037 return error; 2038 } 2039 2040 gfsflags = ip->i_diskflags; 2041 if (gfsflags & GFS2_DIF_APPENDONLY) 2042 stat->attributes |= STATX_ATTR_APPEND; 2043 if (gfsflags & GFS2_DIF_IMMUTABLE) 2044 stat->attributes |= STATX_ATTR_IMMUTABLE; 2045 2046 stat->attributes_mask |= (STATX_ATTR_APPEND | 2047 STATX_ATTR_COMPRESSED | 2048 STATX_ATTR_ENCRYPTED | 2049 STATX_ATTR_IMMUTABLE | 2050 STATX_ATTR_NODUMP); 2051 2052 generic_fillattr(inode, stat); 2053 2054 if (gfs2_holder_initialized(&gh)) 2055 gfs2_glock_dq_uninit(&gh); 2056 2057 return 0; 2058 } 2059 2060 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2061 u64 start, u64 len) 2062 { 2063 struct gfs2_inode *ip = GFS2_I(inode); 2064 struct gfs2_holder gh; 2065 int ret; 2066 2067 inode_lock_shared(inode); 2068 2069 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2070 if (ret) 2071 goto out; 2072 2073 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2074 2075 gfs2_glock_dq_uninit(&gh); 2076 2077 out: 2078 inode_unlock_shared(inode); 2079 return ret; 2080 } 2081 2082 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2083 { 2084 struct inode *inode = file->f_mapping->host; 2085 struct gfs2_inode *ip = GFS2_I(inode); 2086 struct gfs2_holder gh; 2087 loff_t ret; 2088 2089 inode_lock_shared(inode); 2090 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2091 if (!ret) 2092 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2093 gfs2_glock_dq_uninit(&gh); 2094 inode_unlock_shared(inode); 2095 2096 if (ret < 0) 2097 return ret; 2098 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2099 } 2100 2101 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2102 { 2103 struct inode *inode = file->f_mapping->host; 2104 struct gfs2_inode *ip = GFS2_I(inode); 2105 struct gfs2_holder gh; 2106 loff_t ret; 2107 2108 inode_lock_shared(inode); 2109 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2110 if (!ret) 2111 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2112 gfs2_glock_dq_uninit(&gh); 2113 inode_unlock_shared(inode); 2114 2115 if (ret < 0) 2116 return ret; 2117 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2118 } 2119 2120 static int gfs2_update_time(struct inode *inode, struct timespec64 *time, 2121 int flags) 2122 { 2123 struct gfs2_inode *ip = GFS2_I(inode); 2124 struct gfs2_glock *gl = ip->i_gl; 2125 struct gfs2_holder *gh; 2126 int error; 2127 2128 gh = gfs2_glock_is_locked_by_me(gl); 2129 if (gh && !gfs2_glock_is_held_excl(gl)) { 2130 gfs2_glock_dq(gh); 2131 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2132 error = gfs2_glock_nq(gh); 2133 if (error) 2134 return error; 2135 } 2136 return generic_update_time(inode, time, flags); 2137 } 2138 2139 static const struct inode_operations gfs2_file_iops = { 2140 .permission = gfs2_permission, 2141 .setattr = gfs2_setattr, 2142 .getattr = gfs2_getattr, 2143 .listxattr = gfs2_listxattr, 2144 .fiemap = gfs2_fiemap, 2145 .get_acl = gfs2_get_acl, 2146 .set_acl = gfs2_set_acl, 2147 .update_time = gfs2_update_time, 2148 }; 2149 2150 static const struct inode_operations gfs2_dir_iops = { 2151 .create = gfs2_create, 2152 .lookup = gfs2_lookup, 2153 .link = gfs2_link, 2154 .unlink = gfs2_unlink, 2155 .symlink = gfs2_symlink, 2156 .mkdir = gfs2_mkdir, 2157 .rmdir = gfs2_unlink, 2158 .mknod = gfs2_mknod, 2159 .rename = gfs2_rename2, 2160 .permission = gfs2_permission, 2161 .setattr = gfs2_setattr, 2162 .getattr = gfs2_getattr, 2163 .listxattr = gfs2_listxattr, 2164 .fiemap = gfs2_fiemap, 2165 .get_acl = gfs2_get_acl, 2166 .set_acl = gfs2_set_acl, 2167 .update_time = gfs2_update_time, 2168 .atomic_open = gfs2_atomic_open, 2169 }; 2170 2171 static const struct inode_operations gfs2_symlink_iops = { 2172 .get_link = gfs2_get_link, 2173 .permission = gfs2_permission, 2174 .setattr = gfs2_setattr, 2175 .getattr = gfs2_getattr, 2176 .listxattr = gfs2_listxattr, 2177 .fiemap = gfs2_fiemap, 2178 }; 2179 2180