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 * @dir: The inode of the directory containing the inode to look-up 289 * @name: The name of the inode to look for 290 * @is_root: If 1, ignore the caller's permissions 291 * 292 * This can be called via the VFS filldir function when NFS is doing 293 * a readdirplus and the inode which its intending to stat isn't 294 * already in cache. In this case we must not take the directory glock 295 * again, since the readdir call will have already taken that lock. 296 * 297 * Returns: errno 298 */ 299 300 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 301 int is_root) 302 { 303 struct super_block *sb = dir->i_sb; 304 struct gfs2_inode *dip = GFS2_I(dir); 305 struct gfs2_holder d_gh; 306 int error = 0; 307 struct inode *inode = NULL; 308 309 gfs2_holder_mark_uninitialized(&d_gh); 310 if (!name->len || name->len > GFS2_FNAMESIZE) 311 return ERR_PTR(-ENAMETOOLONG); 312 313 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 314 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 315 dir == d_inode(sb->s_root))) { 316 igrab(dir); 317 return dir; 318 } 319 320 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 321 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 322 if (error) 323 return ERR_PTR(error); 324 } 325 326 if (!is_root) { 327 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC); 328 if (error) 329 goto out; 330 } 331 332 inode = gfs2_dir_search(dir, name, false); 333 if (IS_ERR(inode)) 334 error = PTR_ERR(inode); 335 out: 336 if (gfs2_holder_initialized(&d_gh)) 337 gfs2_glock_dq_uninit(&d_gh); 338 if (error == -ENOENT) 339 return NULL; 340 return inode ? inode : ERR_PTR(error); 341 } 342 343 /** 344 * create_ok - OK to create a new on-disk inode here? 345 * @dip: Directory in which dinode is to be created 346 * @name: Name of new dinode 347 * @mode: 348 * 349 * Returns: errno 350 */ 351 352 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 353 umode_t mode) 354 { 355 int error; 356 357 error = gfs2_permission(&init_user_ns, &dip->i_inode, 358 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 * 479 */ 480 481 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 482 const char *symname) 483 { 484 struct gfs2_dinode *di; 485 struct buffer_head *dibh; 486 487 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 488 gfs2_trans_add_meta(ip->i_gl, dibh); 489 di = (struct gfs2_dinode *)dibh->b_data; 490 gfs2_dinode_out(ip, di); 491 492 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 493 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 494 di->__pad1 = 0; 495 di->__pad2 = 0; 496 di->__pad3 = 0; 497 memset(&di->__pad4, 0, sizeof(di->__pad4)); 498 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 499 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 500 501 switch(ip->i_inode.i_mode & S_IFMT) { 502 case S_IFDIR: 503 gfs2_init_dir(dibh, dip); 504 break; 505 case S_IFLNK: 506 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 507 break; 508 } 509 510 set_buffer_uptodate(dibh); 511 brelse(dibh); 512 } 513 514 /** 515 * gfs2_trans_da_blks - Calculate number of blocks to link inode 516 * @dip: The directory we are linking into 517 * @da: The dir add information 518 * @nr_inodes: The number of inodes involved 519 * 520 * This calculate the number of blocks we need to reserve in a 521 * transaction to link @nr_inodes into a directory. In most cases 522 * @nr_inodes will be 2 (the directory plus the inode being linked in) 523 * but in case of rename, 4 may be required. 524 * 525 * Returns: Number of blocks 526 */ 527 528 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 529 const struct gfs2_diradd *da, 530 unsigned nr_inodes) 531 { 532 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 533 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 534 } 535 536 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 537 struct gfs2_inode *ip, struct gfs2_diradd *da) 538 { 539 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 540 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 541 int error; 542 543 if (da->nr_blocks) { 544 error = gfs2_quota_lock_check(dip, &ap); 545 if (error) 546 goto fail_quota_locks; 547 548 error = gfs2_inplace_reserve(dip, &ap); 549 if (error) 550 goto fail_quota_locks; 551 552 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 553 if (error) 554 goto fail_ipreserv; 555 } else { 556 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 557 if (error) 558 goto fail_quota_locks; 559 } 560 561 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 562 563 gfs2_trans_end(sdp); 564 fail_ipreserv: 565 gfs2_inplace_release(dip); 566 fail_quota_locks: 567 gfs2_quota_unlock(dip); 568 return error; 569 } 570 571 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 572 void *fs_info) 573 { 574 const struct xattr *xattr; 575 int err = 0; 576 577 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 578 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 579 xattr->value_len, 0, 580 GFS2_EATYPE_SECURITY); 581 if (err < 0) 582 break; 583 } 584 return err; 585 } 586 587 /** 588 * gfs2_create_inode - Create a new inode 589 * @dir: The parent directory 590 * @dentry: The new dentry 591 * @file: If non-NULL, the file which is being opened 592 * @mode: The permissions on the new inode 593 * @dev: For device nodes, this is the device number 594 * @symname: For symlinks, this is the link destination 595 * @size: The initial size of the inode (ignored for directories) 596 * @excl: Force fail if inode exists 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 * @mnt_userns: User namespace of the mount the inode was found from 840 * @dir: The directory in which to create the file 841 * @dentry: The dentry of the new file 842 * @mode: The mode of the new file 843 * @excl: Force fail if inode exists 844 * 845 * Returns: errno 846 */ 847 848 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir, 849 struct dentry *dentry, umode_t mode, bool excl) 850 { 851 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 852 } 853 854 /** 855 * __gfs2_lookup - Look up a filename in a directory and return its inode 856 * @dir: The directory inode 857 * @dentry: The dentry of the new inode 858 * @file: File to be opened 859 * 860 * 861 * Returns: errno 862 */ 863 864 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 865 struct file *file) 866 { 867 struct inode *inode; 868 struct dentry *d; 869 struct gfs2_holder gh; 870 struct gfs2_glock *gl; 871 int error; 872 873 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 874 if (inode == NULL) { 875 d_add(dentry, NULL); 876 return NULL; 877 } 878 if (IS_ERR(inode)) 879 return ERR_CAST(inode); 880 881 gl = GFS2_I(inode)->i_gl; 882 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 883 if (error) { 884 iput(inode); 885 return ERR_PTR(error); 886 } 887 888 d = d_splice_alias(inode, dentry); 889 if (IS_ERR(d)) { 890 gfs2_glock_dq_uninit(&gh); 891 return d; 892 } 893 if (file && S_ISREG(inode->i_mode)) 894 error = finish_open(file, dentry, gfs2_open_common); 895 896 gfs2_glock_dq_uninit(&gh); 897 if (error) { 898 dput(d); 899 return ERR_PTR(error); 900 } 901 return d; 902 } 903 904 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 905 unsigned flags) 906 { 907 return __gfs2_lookup(dir, dentry, NULL); 908 } 909 910 /** 911 * gfs2_link - Link to a file 912 * @old_dentry: The inode to link 913 * @dir: Add link to this directory 914 * @dentry: The name of the link 915 * 916 * Link the inode in "old_dentry" into the directory "dir" with the 917 * name in "dentry". 918 * 919 * Returns: errno 920 */ 921 922 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 923 struct dentry *dentry) 924 { 925 struct gfs2_inode *dip = GFS2_I(dir); 926 struct gfs2_sbd *sdp = GFS2_SB(dir); 927 struct inode *inode = d_inode(old_dentry); 928 struct gfs2_inode *ip = GFS2_I(inode); 929 struct gfs2_holder ghs[2]; 930 struct buffer_head *dibh; 931 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 932 int error; 933 934 if (S_ISDIR(inode->i_mode)) 935 return -EPERM; 936 937 error = gfs2_qa_get(dip); 938 if (error) 939 return error; 940 941 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 942 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 943 944 error = gfs2_glock_nq(ghs); /* parent */ 945 if (error) 946 goto out_parent; 947 948 error = gfs2_glock_nq(ghs + 1); /* child */ 949 if (error) 950 goto out_child; 951 952 error = -ENOENT; 953 if (inode->i_nlink == 0) 954 goto out_gunlock; 955 956 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 957 if (error) 958 goto out_gunlock; 959 960 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 961 switch (error) { 962 case -ENOENT: 963 break; 964 case 0: 965 error = -EEXIST; 966 goto out_gunlock; 967 default: 968 goto out_gunlock; 969 } 970 971 error = -EINVAL; 972 if (!dip->i_inode.i_nlink) 973 goto out_gunlock; 974 error = -EFBIG; 975 if (dip->i_entries == (u32)-1) 976 goto out_gunlock; 977 error = -EPERM; 978 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 979 goto out_gunlock; 980 error = -EINVAL; 981 if (!ip->i_inode.i_nlink) 982 goto out_gunlock; 983 error = -EMLINK; 984 if (ip->i_inode.i_nlink == (u32)-1) 985 goto out_gunlock; 986 987 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 988 if (error < 0) 989 goto out_gunlock; 990 991 if (da.nr_blocks) { 992 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 993 error = gfs2_quota_lock_check(dip, &ap); 994 if (error) 995 goto out_gunlock; 996 997 error = gfs2_inplace_reserve(dip, &ap); 998 if (error) 999 goto out_gunlock_q; 1000 1001 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1002 if (error) 1003 goto out_ipres; 1004 } else { 1005 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1006 if (error) 1007 goto out_ipres; 1008 } 1009 1010 error = gfs2_meta_inode_buffer(ip, &dibh); 1011 if (error) 1012 goto out_end_trans; 1013 1014 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1015 if (error) 1016 goto out_brelse; 1017 1018 gfs2_trans_add_meta(ip->i_gl, dibh); 1019 inc_nlink(&ip->i_inode); 1020 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1021 ihold(inode); 1022 d_instantiate(dentry, inode); 1023 mark_inode_dirty(inode); 1024 1025 out_brelse: 1026 brelse(dibh); 1027 out_end_trans: 1028 gfs2_trans_end(sdp); 1029 out_ipres: 1030 if (da.nr_blocks) 1031 gfs2_inplace_release(dip); 1032 out_gunlock_q: 1033 if (da.nr_blocks) 1034 gfs2_quota_unlock(dip); 1035 out_gunlock: 1036 gfs2_dir_no_add(&da); 1037 gfs2_glock_dq(ghs + 1); 1038 out_child: 1039 gfs2_glock_dq(ghs); 1040 out_parent: 1041 gfs2_qa_put(dip); 1042 gfs2_holder_uninit(ghs); 1043 gfs2_holder_uninit(ghs + 1); 1044 return error; 1045 } 1046 1047 /* 1048 * gfs2_unlink_ok - check to see that a inode is still in a directory 1049 * @dip: the directory 1050 * @name: the name of the file 1051 * @ip: the inode 1052 * 1053 * Assumes that the lock on (at least) @dip is held. 1054 * 1055 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1056 */ 1057 1058 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1059 const struct gfs2_inode *ip) 1060 { 1061 int error; 1062 1063 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1064 return -EPERM; 1065 1066 if ((dip->i_inode.i_mode & S_ISVTX) && 1067 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1068 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1069 return -EPERM; 1070 1071 if (IS_APPEND(&dip->i_inode)) 1072 return -EPERM; 1073 1074 error = gfs2_permission(&init_user_ns, &dip->i_inode, 1075 MAY_WRITE | MAY_EXEC); 1076 if (error) 1077 return error; 1078 1079 return gfs2_dir_check(&dip->i_inode, name, ip); 1080 } 1081 1082 /** 1083 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1084 * @dip: The parent directory 1085 * @dentry: The dentry to unlink 1086 * 1087 * Called with all the locks and in a transaction. This will only be 1088 * called for a directory after it has been checked to ensure it is empty. 1089 * 1090 * Returns: 0 on success, or an error 1091 */ 1092 1093 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1094 const struct dentry *dentry) 1095 { 1096 struct inode *inode = d_inode(dentry); 1097 struct gfs2_inode *ip = GFS2_I(inode); 1098 int error; 1099 1100 error = gfs2_dir_del(dip, dentry); 1101 if (error) 1102 return error; 1103 1104 ip->i_entries = 0; 1105 inode->i_ctime = current_time(inode); 1106 if (S_ISDIR(inode->i_mode)) 1107 clear_nlink(inode); 1108 else 1109 drop_nlink(inode); 1110 mark_inode_dirty(inode); 1111 if (inode->i_nlink == 0) 1112 gfs2_unlink_di(inode); 1113 return 0; 1114 } 1115 1116 1117 /** 1118 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1119 * @dir: The inode of the directory containing the inode to unlink 1120 * @dentry: The file itself 1121 * 1122 * This routine uses the type of the inode as a flag to figure out 1123 * whether this is an unlink or an rmdir. 1124 * 1125 * Returns: errno 1126 */ 1127 1128 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1129 { 1130 struct gfs2_inode *dip = GFS2_I(dir); 1131 struct gfs2_sbd *sdp = GFS2_SB(dir); 1132 struct inode *inode = d_inode(dentry); 1133 struct gfs2_inode *ip = GFS2_I(inode); 1134 struct gfs2_holder ghs[3]; 1135 struct gfs2_rgrpd *rgd; 1136 int error; 1137 1138 error = gfs2_rindex_update(sdp); 1139 if (error) 1140 return error; 1141 1142 error = -EROFS; 1143 1144 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1145 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1146 1147 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1148 if (!rgd) 1149 goto out_inodes; 1150 1151 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2); 1152 1153 1154 error = gfs2_glock_nq(ghs); /* parent */ 1155 if (error) 1156 goto out_parent; 1157 1158 error = gfs2_glock_nq(ghs + 1); /* child */ 1159 if (error) 1160 goto out_child; 1161 1162 error = -ENOENT; 1163 if (inode->i_nlink == 0) 1164 goto out_rgrp; 1165 1166 if (S_ISDIR(inode->i_mode)) { 1167 error = -ENOTEMPTY; 1168 if (ip->i_entries > 2 || inode->i_nlink > 2) 1169 goto out_rgrp; 1170 } 1171 1172 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1173 if (error) 1174 goto out_rgrp; 1175 1176 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1177 if (error) 1178 goto out_gunlock; 1179 1180 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1181 if (error) 1182 goto out_gunlock; 1183 1184 error = gfs2_unlink_inode(dip, dentry); 1185 gfs2_trans_end(sdp); 1186 1187 out_gunlock: 1188 gfs2_glock_dq(ghs + 2); 1189 out_rgrp: 1190 gfs2_glock_dq(ghs + 1); 1191 out_child: 1192 gfs2_glock_dq(ghs); 1193 out_parent: 1194 gfs2_holder_uninit(ghs + 2); 1195 out_inodes: 1196 gfs2_holder_uninit(ghs + 1); 1197 gfs2_holder_uninit(ghs); 1198 return error; 1199 } 1200 1201 /** 1202 * gfs2_symlink - Create a symlink 1203 * @mnt_userns: User namespace of the mount the inode was found from 1204 * @dir: The directory to create the symlink in 1205 * @dentry: The dentry to put the symlink in 1206 * @symname: The thing which the link points to 1207 * 1208 * Returns: errno 1209 */ 1210 1211 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1212 struct dentry *dentry, const char *symname) 1213 { 1214 unsigned int size; 1215 1216 size = strlen(symname); 1217 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1218 return -ENAMETOOLONG; 1219 1220 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1221 } 1222 1223 /** 1224 * gfs2_mkdir - Make a directory 1225 * @mnt_userns: User namespace of the mount the inode was found from 1226 * @dir: The parent directory of the new one 1227 * @dentry: The dentry of the new directory 1228 * @mode: The mode of the new directory 1229 * 1230 * Returns: errno 1231 */ 1232 1233 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 1234 struct dentry *dentry, umode_t mode) 1235 { 1236 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1237 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1238 } 1239 1240 /** 1241 * gfs2_mknod - Make a special file 1242 * @mnt_userns: User namespace of the mount the inode was found from 1243 * @dir: The directory in which the special file will reside 1244 * @dentry: The dentry of the special file 1245 * @mode: The mode of the special file 1246 * @dev: The device specification of the special file 1247 * 1248 */ 1249 1250 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1251 struct dentry *dentry, umode_t mode, dev_t dev) 1252 { 1253 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1254 } 1255 1256 /** 1257 * gfs2_atomic_open - Atomically open a file 1258 * @dir: The directory 1259 * @dentry: The proposed new entry 1260 * @file: The proposed new struct file 1261 * @flags: open flags 1262 * @mode: File mode 1263 * 1264 * Returns: error code or 0 for success 1265 */ 1266 1267 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1268 struct file *file, unsigned flags, 1269 umode_t mode) 1270 { 1271 struct dentry *d; 1272 bool excl = !!(flags & O_EXCL); 1273 1274 if (!d_in_lookup(dentry)) 1275 goto skip_lookup; 1276 1277 d = __gfs2_lookup(dir, dentry, file); 1278 if (IS_ERR(d)) 1279 return PTR_ERR(d); 1280 if (d != NULL) 1281 dentry = d; 1282 if (d_really_is_positive(dentry)) { 1283 if (!(file->f_mode & FMODE_OPENED)) 1284 return finish_no_open(file, d); 1285 dput(d); 1286 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1287 } 1288 1289 BUG_ON(d != NULL); 1290 1291 skip_lookup: 1292 if (!(flags & O_CREAT)) 1293 return -ENOENT; 1294 1295 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1296 } 1297 1298 /* 1299 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1300 * @this: move this 1301 * @to: to here 1302 * 1303 * Follow @to back to the root and make sure we don't encounter @this 1304 * Assumes we already hold the rename lock. 1305 * 1306 * Returns: errno 1307 */ 1308 1309 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1310 { 1311 struct inode *dir = &to->i_inode; 1312 struct super_block *sb = dir->i_sb; 1313 struct inode *tmp; 1314 int error = 0; 1315 1316 igrab(dir); 1317 1318 for (;;) { 1319 if (dir == &this->i_inode) { 1320 error = -EINVAL; 1321 break; 1322 } 1323 if (dir == d_inode(sb->s_root)) { 1324 error = 0; 1325 break; 1326 } 1327 1328 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1329 if (!tmp) { 1330 error = -ENOENT; 1331 break; 1332 } 1333 if (IS_ERR(tmp)) { 1334 error = PTR_ERR(tmp); 1335 break; 1336 } 1337 1338 iput(dir); 1339 dir = tmp; 1340 } 1341 1342 iput(dir); 1343 1344 return error; 1345 } 1346 1347 /** 1348 * update_moved_ino - Update an inode that's being moved 1349 * @ip: The inode being moved 1350 * @ndip: The parent directory of the new filename 1351 * @dir_rename: True of ip is a directory 1352 * 1353 * Returns: errno 1354 */ 1355 1356 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1357 int dir_rename) 1358 { 1359 if (dir_rename) 1360 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1361 1362 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1363 mark_inode_dirty_sync(&ip->i_inode); 1364 return 0; 1365 } 1366 1367 1368 /** 1369 * gfs2_rename - Rename a file 1370 * @odir: Parent directory of old file name 1371 * @odentry: The old dentry of the file 1372 * @ndir: Parent directory of new file name 1373 * @ndentry: The new dentry of the file 1374 * 1375 * Returns: errno 1376 */ 1377 1378 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1379 struct inode *ndir, struct dentry *ndentry) 1380 { 1381 struct gfs2_inode *odip = GFS2_I(odir); 1382 struct gfs2_inode *ndip = GFS2_I(ndir); 1383 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1384 struct gfs2_inode *nip = NULL; 1385 struct gfs2_sbd *sdp = GFS2_SB(odir); 1386 struct gfs2_holder ghs[4], r_gh, rd_gh; 1387 struct gfs2_rgrpd *nrgd; 1388 unsigned int num_gh; 1389 int dir_rename = 0; 1390 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1391 unsigned int x; 1392 int error; 1393 1394 gfs2_holder_mark_uninitialized(&r_gh); 1395 gfs2_holder_mark_uninitialized(&rd_gh); 1396 if (d_really_is_positive(ndentry)) { 1397 nip = GFS2_I(d_inode(ndentry)); 1398 if (ip == nip) 1399 return 0; 1400 } 1401 1402 error = gfs2_rindex_update(sdp); 1403 if (error) 1404 return error; 1405 1406 error = gfs2_qa_get(ndip); 1407 if (error) 1408 return error; 1409 1410 if (odip != ndip) { 1411 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1412 0, &r_gh); 1413 if (error) 1414 goto out; 1415 1416 if (S_ISDIR(ip->i_inode.i_mode)) { 1417 dir_rename = 1; 1418 /* don't move a directory into its subdir */ 1419 error = gfs2_ok_to_move(ip, ndip); 1420 if (error) 1421 goto out_gunlock_r; 1422 } 1423 } 1424 1425 num_gh = 1; 1426 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1427 if (odip != ndip) { 1428 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1429 ghs + num_gh); 1430 num_gh++; 1431 } 1432 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1433 num_gh++; 1434 1435 if (nip) { 1436 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1437 ghs + num_gh); 1438 num_gh++; 1439 } 1440 1441 for (x = 0; x < num_gh; x++) { 1442 error = gfs2_glock_nq(ghs + x); 1443 if (error) 1444 goto out_gunlock; 1445 } 1446 error = gfs2_glock_async_wait(num_gh, ghs); 1447 if (error) 1448 goto out_gunlock; 1449 1450 if (nip) { 1451 /* Grab the resource group glock for unlink flag twiddling. 1452 * This is the case where the target dinode already exists 1453 * so we unlink before doing the rename. 1454 */ 1455 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1456 if (!nrgd) { 1457 error = -ENOENT; 1458 goto out_gunlock; 1459 } 1460 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1461 LM_FLAG_NODE_SCOPE, &rd_gh); 1462 if (error) 1463 goto out_gunlock; 1464 } 1465 1466 error = -ENOENT; 1467 if (ip->i_inode.i_nlink == 0) 1468 goto out_gunlock; 1469 1470 /* Check out the old directory */ 1471 1472 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1473 if (error) 1474 goto out_gunlock; 1475 1476 /* Check out the new directory */ 1477 1478 if (nip) { 1479 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1480 if (error) 1481 goto out_gunlock; 1482 1483 if (nip->i_inode.i_nlink == 0) { 1484 error = -EAGAIN; 1485 goto out_gunlock; 1486 } 1487 1488 if (S_ISDIR(nip->i_inode.i_mode)) { 1489 if (nip->i_entries < 2) { 1490 gfs2_consist_inode(nip); 1491 error = -EIO; 1492 goto out_gunlock; 1493 } 1494 if (nip->i_entries > 2) { 1495 error = -ENOTEMPTY; 1496 goto out_gunlock; 1497 } 1498 } 1499 } else { 1500 error = gfs2_permission(&init_user_ns, ndir, 1501 MAY_WRITE | MAY_EXEC); 1502 if (error) 1503 goto out_gunlock; 1504 1505 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1506 switch (error) { 1507 case -ENOENT: 1508 error = 0; 1509 break; 1510 case 0: 1511 error = -EEXIST; 1512 goto out_gunlock; 1513 default: 1514 goto out_gunlock; 1515 } 1516 1517 if (odip != ndip) { 1518 if (!ndip->i_inode.i_nlink) { 1519 error = -ENOENT; 1520 goto out_gunlock; 1521 } 1522 if (ndip->i_entries == (u32)-1) { 1523 error = -EFBIG; 1524 goto out_gunlock; 1525 } 1526 if (S_ISDIR(ip->i_inode.i_mode) && 1527 ndip->i_inode.i_nlink == (u32)-1) { 1528 error = -EMLINK; 1529 goto out_gunlock; 1530 } 1531 } 1532 } 1533 1534 /* Check out the dir to be renamed */ 1535 1536 if (dir_rename) { 1537 error = gfs2_permission(&init_user_ns, d_inode(odentry), 1538 MAY_WRITE); 1539 if (error) 1540 goto out_gunlock; 1541 } 1542 1543 if (nip == NULL) { 1544 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1545 if (error) 1546 goto out_gunlock; 1547 } 1548 1549 if (da.nr_blocks) { 1550 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1551 error = gfs2_quota_lock_check(ndip, &ap); 1552 if (error) 1553 goto out_gunlock; 1554 1555 error = gfs2_inplace_reserve(ndip, &ap); 1556 if (error) 1557 goto out_gunlock_q; 1558 1559 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1560 4 * RES_LEAF + 4, 0); 1561 if (error) 1562 goto out_ipreserv; 1563 } else { 1564 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1565 5 * RES_LEAF + 4, 0); 1566 if (error) 1567 goto out_gunlock; 1568 } 1569 1570 /* Remove the target file, if it exists */ 1571 1572 if (nip) 1573 error = gfs2_unlink_inode(ndip, ndentry); 1574 1575 error = update_moved_ino(ip, ndip, dir_rename); 1576 if (error) 1577 goto out_end_trans; 1578 1579 error = gfs2_dir_del(odip, odentry); 1580 if (error) 1581 goto out_end_trans; 1582 1583 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1584 if (error) 1585 goto out_end_trans; 1586 1587 out_end_trans: 1588 gfs2_trans_end(sdp); 1589 out_ipreserv: 1590 if (da.nr_blocks) 1591 gfs2_inplace_release(ndip); 1592 out_gunlock_q: 1593 if (da.nr_blocks) 1594 gfs2_quota_unlock(ndip); 1595 out_gunlock: 1596 gfs2_dir_no_add(&da); 1597 if (gfs2_holder_initialized(&rd_gh)) 1598 gfs2_glock_dq_uninit(&rd_gh); 1599 1600 while (x--) { 1601 if (gfs2_holder_queued(ghs + x)) 1602 gfs2_glock_dq(ghs + x); 1603 gfs2_holder_uninit(ghs + x); 1604 } 1605 out_gunlock_r: 1606 if (gfs2_holder_initialized(&r_gh)) 1607 gfs2_glock_dq_uninit(&r_gh); 1608 out: 1609 gfs2_qa_put(ndip); 1610 return error; 1611 } 1612 1613 /** 1614 * gfs2_exchange - exchange two files 1615 * @odir: Parent directory of old file name 1616 * @odentry: The old dentry of the file 1617 * @ndir: Parent directory of new file name 1618 * @ndentry: The new dentry of the file 1619 * @flags: The rename flags 1620 * 1621 * Returns: errno 1622 */ 1623 1624 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1625 struct inode *ndir, struct dentry *ndentry, 1626 unsigned int flags) 1627 { 1628 struct gfs2_inode *odip = GFS2_I(odir); 1629 struct gfs2_inode *ndip = GFS2_I(ndir); 1630 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1631 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1632 struct gfs2_sbd *sdp = GFS2_SB(odir); 1633 struct gfs2_holder ghs[4], r_gh; 1634 unsigned int num_gh; 1635 unsigned int x; 1636 umode_t old_mode = oip->i_inode.i_mode; 1637 umode_t new_mode = nip->i_inode.i_mode; 1638 int error; 1639 1640 gfs2_holder_mark_uninitialized(&r_gh); 1641 error = gfs2_rindex_update(sdp); 1642 if (error) 1643 return error; 1644 1645 if (odip != ndip) { 1646 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1647 0, &r_gh); 1648 if (error) 1649 goto out; 1650 1651 if (S_ISDIR(old_mode)) { 1652 /* don't move a directory into its subdir */ 1653 error = gfs2_ok_to_move(oip, ndip); 1654 if (error) 1655 goto out_gunlock_r; 1656 } 1657 1658 if (S_ISDIR(new_mode)) { 1659 /* don't move a directory into its subdir */ 1660 error = gfs2_ok_to_move(nip, odip); 1661 if (error) 1662 goto out_gunlock_r; 1663 } 1664 } 1665 1666 num_gh = 1; 1667 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1668 if (odip != ndip) { 1669 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1670 ghs + num_gh); 1671 num_gh++; 1672 } 1673 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1674 num_gh++; 1675 1676 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1677 num_gh++; 1678 1679 for (x = 0; x < num_gh; x++) { 1680 error = gfs2_glock_nq(ghs + x); 1681 if (error) 1682 goto out_gunlock; 1683 } 1684 1685 error = gfs2_glock_async_wait(num_gh, ghs); 1686 if (error) 1687 goto out_gunlock; 1688 1689 error = -ENOENT; 1690 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1691 goto out_gunlock; 1692 1693 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1694 if (error) 1695 goto out_gunlock; 1696 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1697 if (error) 1698 goto out_gunlock; 1699 1700 if (S_ISDIR(old_mode)) { 1701 error = gfs2_permission(&init_user_ns, odentry->d_inode, 1702 MAY_WRITE); 1703 if (error) 1704 goto out_gunlock; 1705 } 1706 if (S_ISDIR(new_mode)) { 1707 error = gfs2_permission(&init_user_ns, ndentry->d_inode, 1708 MAY_WRITE); 1709 if (error) 1710 goto out_gunlock; 1711 } 1712 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1713 if (error) 1714 goto out_gunlock; 1715 1716 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1717 if (error) 1718 goto out_end_trans; 1719 1720 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1721 if (error) 1722 goto out_end_trans; 1723 1724 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1725 IF2DT(old_mode)); 1726 if (error) 1727 goto out_end_trans; 1728 1729 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1730 IF2DT(new_mode)); 1731 if (error) 1732 goto out_end_trans; 1733 1734 if (odip != ndip) { 1735 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1736 inc_nlink(&odip->i_inode); 1737 drop_nlink(&ndip->i_inode); 1738 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1739 inc_nlink(&ndip->i_inode); 1740 drop_nlink(&odip->i_inode); 1741 } 1742 } 1743 mark_inode_dirty(&ndip->i_inode); 1744 if (odip != ndip) 1745 mark_inode_dirty(&odip->i_inode); 1746 1747 out_end_trans: 1748 gfs2_trans_end(sdp); 1749 out_gunlock: 1750 while (x--) { 1751 if (gfs2_holder_queued(ghs + x)) 1752 gfs2_glock_dq(ghs + x); 1753 gfs2_holder_uninit(ghs + x); 1754 } 1755 out_gunlock_r: 1756 if (gfs2_holder_initialized(&r_gh)) 1757 gfs2_glock_dq_uninit(&r_gh); 1758 out: 1759 return error; 1760 } 1761 1762 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir, 1763 struct dentry *odentry, struct inode *ndir, 1764 struct dentry *ndentry, unsigned int flags) 1765 { 1766 flags &= ~RENAME_NOREPLACE; 1767 1768 if (flags & ~RENAME_EXCHANGE) 1769 return -EINVAL; 1770 1771 if (flags & RENAME_EXCHANGE) 1772 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1773 1774 return gfs2_rename(odir, odentry, ndir, ndentry); 1775 } 1776 1777 /** 1778 * gfs2_get_link - Follow a symbolic link 1779 * @dentry: The dentry of the link 1780 * @inode: The inode of the link 1781 * @done: destructor for return value 1782 * 1783 * This can handle symlinks of any size. 1784 * 1785 * Returns: 0 on success or error code 1786 */ 1787 1788 static const char *gfs2_get_link(struct dentry *dentry, 1789 struct inode *inode, 1790 struct delayed_call *done) 1791 { 1792 struct gfs2_inode *ip = GFS2_I(inode); 1793 struct gfs2_holder i_gh; 1794 struct buffer_head *dibh; 1795 unsigned int size; 1796 char *buf; 1797 int error; 1798 1799 if (!dentry) 1800 return ERR_PTR(-ECHILD); 1801 1802 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1803 error = gfs2_glock_nq(&i_gh); 1804 if (error) { 1805 gfs2_holder_uninit(&i_gh); 1806 return ERR_PTR(error); 1807 } 1808 1809 size = (unsigned int)i_size_read(&ip->i_inode); 1810 if (size == 0) { 1811 gfs2_consist_inode(ip); 1812 buf = ERR_PTR(-EIO); 1813 goto out; 1814 } 1815 1816 error = gfs2_meta_inode_buffer(ip, &dibh); 1817 if (error) { 1818 buf = ERR_PTR(error); 1819 goto out; 1820 } 1821 1822 buf = kzalloc(size + 1, GFP_NOFS); 1823 if (!buf) 1824 buf = ERR_PTR(-ENOMEM); 1825 else 1826 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1827 brelse(dibh); 1828 out: 1829 gfs2_glock_dq_uninit(&i_gh); 1830 if (!IS_ERR(buf)) 1831 set_delayed_call(done, kfree_link, buf); 1832 return buf; 1833 } 1834 1835 /** 1836 * gfs2_permission 1837 * @mnt_userns: User namespace of the mount the inode was found from 1838 * @inode: The inode 1839 * @mask: The mask to be tested 1840 * 1841 * This may be called from the VFS directly, or from within GFS2 with the 1842 * inode locked, so we look to see if the glock is already locked and only 1843 * lock the glock if its not already been done. 1844 * 1845 * Returns: errno 1846 */ 1847 1848 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode, 1849 int mask) 1850 { 1851 struct gfs2_inode *ip; 1852 struct gfs2_holder i_gh; 1853 int error; 1854 1855 gfs2_holder_mark_uninitialized(&i_gh); 1856 ip = GFS2_I(inode); 1857 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1858 if (mask & MAY_NOT_BLOCK) 1859 return -ECHILD; 1860 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1861 if (error) 1862 return error; 1863 } 1864 1865 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1866 error = -EPERM; 1867 else 1868 error = generic_permission(&init_user_ns, inode, mask); 1869 if (gfs2_holder_initialized(&i_gh)) 1870 gfs2_glock_dq_uninit(&i_gh); 1871 1872 return error; 1873 } 1874 1875 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1876 { 1877 setattr_copy(&init_user_ns, inode, attr); 1878 mark_inode_dirty(inode); 1879 return 0; 1880 } 1881 1882 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1883 { 1884 int error; 1885 1886 if (current->journal_info) 1887 return __gfs2_setattr_simple(inode, attr); 1888 1889 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1890 if (error) 1891 return error; 1892 1893 error = __gfs2_setattr_simple(inode, attr); 1894 gfs2_trans_end(GFS2_SB(inode)); 1895 return error; 1896 } 1897 1898 static int setattr_chown(struct inode *inode, struct iattr *attr) 1899 { 1900 struct gfs2_inode *ip = GFS2_I(inode); 1901 struct gfs2_sbd *sdp = GFS2_SB(inode); 1902 kuid_t ouid, nuid; 1903 kgid_t ogid, ngid; 1904 int error; 1905 struct gfs2_alloc_parms ap; 1906 1907 ouid = inode->i_uid; 1908 ogid = inode->i_gid; 1909 nuid = attr->ia_uid; 1910 ngid = attr->ia_gid; 1911 1912 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1913 ouid = nuid = NO_UID_QUOTA_CHANGE; 1914 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1915 ogid = ngid = NO_GID_QUOTA_CHANGE; 1916 error = gfs2_qa_get(ip); 1917 if (error) 1918 return error; 1919 1920 error = gfs2_rindex_update(sdp); 1921 if (error) 1922 goto out; 1923 1924 error = gfs2_quota_lock(ip, nuid, ngid); 1925 if (error) 1926 goto out; 1927 1928 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1929 1930 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1931 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1932 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1933 if (error) 1934 goto out_gunlock_q; 1935 } 1936 1937 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1938 if (error) 1939 goto out_gunlock_q; 1940 1941 error = gfs2_setattr_simple(inode, attr); 1942 if (error) 1943 goto out_end_trans; 1944 1945 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1946 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1947 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1948 gfs2_quota_change(ip, ap.target, nuid, ngid); 1949 } 1950 1951 out_end_trans: 1952 gfs2_trans_end(sdp); 1953 out_gunlock_q: 1954 gfs2_quota_unlock(ip); 1955 out: 1956 gfs2_qa_put(ip); 1957 return error; 1958 } 1959 1960 /** 1961 * gfs2_setattr - Change attributes on an inode 1962 * @mnt_userns: User namespace of the mount the inode was found from 1963 * @dentry: The dentry which is changing 1964 * @attr: The structure describing the change 1965 * 1966 * The VFS layer wants to change one or more of an inodes attributes. Write 1967 * that change out to disk. 1968 * 1969 * Returns: errno 1970 */ 1971 1972 static int gfs2_setattr(struct user_namespace *mnt_userns, 1973 struct dentry *dentry, struct iattr *attr) 1974 { 1975 struct inode *inode = d_inode(dentry); 1976 struct gfs2_inode *ip = GFS2_I(inode); 1977 struct gfs2_holder i_gh; 1978 int error; 1979 1980 error = gfs2_qa_get(ip); 1981 if (error) 1982 return error; 1983 1984 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1985 if (error) 1986 goto out; 1987 1988 error = may_setattr(&init_user_ns, inode, attr->ia_valid); 1989 if (error) 1990 goto error; 1991 1992 error = setattr_prepare(&init_user_ns, dentry, attr); 1993 if (error) 1994 goto error; 1995 1996 if (attr->ia_valid & ATTR_SIZE) 1997 error = gfs2_setattr_size(inode, attr->ia_size); 1998 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1999 error = setattr_chown(inode, attr); 2000 else { 2001 error = gfs2_setattr_simple(inode, attr); 2002 if (!error && attr->ia_valid & ATTR_MODE) 2003 error = posix_acl_chmod(&init_user_ns, inode, 2004 inode->i_mode); 2005 } 2006 2007 error: 2008 if (!error) 2009 mark_inode_dirty(inode); 2010 gfs2_glock_dq_uninit(&i_gh); 2011 out: 2012 gfs2_qa_put(ip); 2013 return error; 2014 } 2015 2016 /** 2017 * gfs2_getattr - Read out an inode's attributes 2018 * @mnt_userns: user namespace of the mount the inode was found from 2019 * @path: Object to query 2020 * @stat: The inode's stats 2021 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2022 * @flags: AT_STATX_xxx setting 2023 * 2024 * This may be called from the VFS directly, or from within GFS2 with the 2025 * inode locked, so we look to see if the glock is already locked and only 2026 * lock the glock if its not already been done. Note that its the NFS 2027 * readdirplus operation which causes this to be called (from filldir) 2028 * with the glock already held. 2029 * 2030 * Returns: errno 2031 */ 2032 2033 static int gfs2_getattr(struct user_namespace *mnt_userns, 2034 const struct path *path, struct kstat *stat, 2035 u32 request_mask, unsigned int flags) 2036 { 2037 struct inode *inode = d_inode(path->dentry); 2038 struct gfs2_inode *ip = GFS2_I(inode); 2039 struct gfs2_holder gh; 2040 u32 gfsflags; 2041 int error; 2042 2043 gfs2_holder_mark_uninitialized(&gh); 2044 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2045 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2046 if (error) 2047 return error; 2048 } 2049 2050 gfsflags = ip->i_diskflags; 2051 if (gfsflags & GFS2_DIF_APPENDONLY) 2052 stat->attributes |= STATX_ATTR_APPEND; 2053 if (gfsflags & GFS2_DIF_IMMUTABLE) 2054 stat->attributes |= STATX_ATTR_IMMUTABLE; 2055 2056 stat->attributes_mask |= (STATX_ATTR_APPEND | 2057 STATX_ATTR_COMPRESSED | 2058 STATX_ATTR_ENCRYPTED | 2059 STATX_ATTR_IMMUTABLE | 2060 STATX_ATTR_NODUMP); 2061 2062 generic_fillattr(&init_user_ns, inode, stat); 2063 2064 if (gfs2_holder_initialized(&gh)) 2065 gfs2_glock_dq_uninit(&gh); 2066 2067 return 0; 2068 } 2069 2070 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2071 u64 start, u64 len) 2072 { 2073 struct gfs2_inode *ip = GFS2_I(inode); 2074 struct gfs2_holder gh; 2075 int ret; 2076 2077 inode_lock_shared(inode); 2078 2079 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2080 if (ret) 2081 goto out; 2082 2083 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2084 2085 gfs2_glock_dq_uninit(&gh); 2086 2087 out: 2088 inode_unlock_shared(inode); 2089 return ret; 2090 } 2091 2092 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2093 { 2094 struct inode *inode = file->f_mapping->host; 2095 struct gfs2_inode *ip = GFS2_I(inode); 2096 struct gfs2_holder gh; 2097 loff_t ret; 2098 2099 inode_lock_shared(inode); 2100 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2101 if (!ret) 2102 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2103 gfs2_glock_dq_uninit(&gh); 2104 inode_unlock_shared(inode); 2105 2106 if (ret < 0) 2107 return ret; 2108 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2109 } 2110 2111 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2112 { 2113 struct inode *inode = file->f_mapping->host; 2114 struct gfs2_inode *ip = GFS2_I(inode); 2115 struct gfs2_holder gh; 2116 loff_t ret; 2117 2118 inode_lock_shared(inode); 2119 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2120 if (!ret) 2121 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2122 gfs2_glock_dq_uninit(&gh); 2123 inode_unlock_shared(inode); 2124 2125 if (ret < 0) 2126 return ret; 2127 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2128 } 2129 2130 static int gfs2_update_time(struct inode *inode, struct timespec64 *time, 2131 int flags) 2132 { 2133 struct gfs2_inode *ip = GFS2_I(inode); 2134 struct gfs2_glock *gl = ip->i_gl; 2135 struct gfs2_holder *gh; 2136 int error; 2137 2138 gh = gfs2_glock_is_locked_by_me(gl); 2139 if (gh && !gfs2_glock_is_held_excl(gl)) { 2140 gfs2_glock_dq(gh); 2141 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2142 error = gfs2_glock_nq(gh); 2143 if (error) 2144 return error; 2145 } 2146 return generic_update_time(inode, time, flags); 2147 } 2148 2149 static const struct inode_operations gfs2_file_iops = { 2150 .permission = gfs2_permission, 2151 .setattr = gfs2_setattr, 2152 .getattr = gfs2_getattr, 2153 .listxattr = gfs2_listxattr, 2154 .fiemap = gfs2_fiemap, 2155 .get_acl = gfs2_get_acl, 2156 .set_acl = gfs2_set_acl, 2157 .update_time = gfs2_update_time, 2158 .fileattr_get = gfs2_fileattr_get, 2159 .fileattr_set = gfs2_fileattr_set, 2160 }; 2161 2162 static const struct inode_operations gfs2_dir_iops = { 2163 .create = gfs2_create, 2164 .lookup = gfs2_lookup, 2165 .link = gfs2_link, 2166 .unlink = gfs2_unlink, 2167 .symlink = gfs2_symlink, 2168 .mkdir = gfs2_mkdir, 2169 .rmdir = gfs2_unlink, 2170 .mknod = gfs2_mknod, 2171 .rename = gfs2_rename2, 2172 .permission = gfs2_permission, 2173 .setattr = gfs2_setattr, 2174 .getattr = gfs2_getattr, 2175 .listxattr = gfs2_listxattr, 2176 .fiemap = gfs2_fiemap, 2177 .get_acl = gfs2_get_acl, 2178 .set_acl = gfs2_set_acl, 2179 .update_time = gfs2_update_time, 2180 .atomic_open = gfs2_atomic_open, 2181 .fileattr_get = gfs2_fileattr_get, 2182 .fileattr_set = gfs2_fileattr_set, 2183 }; 2184 2185 static const struct inode_operations gfs2_symlink_iops = { 2186 .get_link = gfs2_get_link, 2187 .permission = gfs2_permission, 2188 .setattr = gfs2_setattr, 2189 .getattr = gfs2_getattr, 2190 .listxattr = gfs2_listxattr, 2191 .fiemap = gfs2_fiemap, 2192 }; 2193 2194