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 /** 44 * gfs2_set_iop - Sets inode operations 45 * @inode: The inode with correct i_mode filled in 46 * 47 * GFS2 lookup code fills in vfs inode contents based on info obtained 48 * from directory entry inside gfs2_inode_lookup(). 49 */ 50 51 static void gfs2_set_iop(struct inode *inode) 52 { 53 struct gfs2_sbd *sdp = GFS2_SB(inode); 54 umode_t mode = inode->i_mode; 55 56 if (S_ISREG(mode)) { 57 inode->i_op = &gfs2_file_iops; 58 if (gfs2_localflocks(sdp)) 59 inode->i_fop = &gfs2_file_fops_nolock; 60 else 61 inode->i_fop = &gfs2_file_fops; 62 } else if (S_ISDIR(mode)) { 63 inode->i_op = &gfs2_dir_iops; 64 if (gfs2_localflocks(sdp)) 65 inode->i_fop = &gfs2_dir_fops_nolock; 66 else 67 inode->i_fop = &gfs2_dir_fops; 68 } else if (S_ISLNK(mode)) { 69 inode->i_op = &gfs2_symlink_iops; 70 } else { 71 inode->i_op = &gfs2_file_iops; 72 init_special_inode(inode, inode->i_mode, inode->i_rdev); 73 } 74 } 75 76 static int iget_test(struct inode *inode, void *opaque) 77 { 78 u64 no_addr = *(u64 *)opaque; 79 80 return GFS2_I(inode)->i_no_addr == no_addr; 81 } 82 83 static int iget_set(struct inode *inode, void *opaque) 84 { 85 u64 no_addr = *(u64 *)opaque; 86 87 GFS2_I(inode)->i_no_addr = no_addr; 88 inode->i_ino = no_addr; 89 return 0; 90 } 91 92 /** 93 * gfs2_inode_lookup - Lookup an inode 94 * @sb: The super block 95 * @type: The type of the inode 96 * @no_addr: The inode number 97 * @no_formal_ino: The inode generation number 98 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; 99 * GFS2_BLKST_FREE to indicate not to verify) 100 * 101 * If @type is DT_UNKNOWN, the inode type is fetched from disk. 102 * 103 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a 104 * placeholder because it doesn't otherwise make sense), the on-disk block type 105 * is verified to be @blktype. 106 * 107 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE) 108 * if it detects that @no_formal_ino doesn't match the actual inode generation 109 * number. However, it doesn't always know unless @type is DT_UNKNOWN. 110 * 111 * Returns: A VFS inode, or an error 112 */ 113 114 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 115 u64 no_addr, u64 no_formal_ino, 116 unsigned int blktype) 117 { 118 struct inode *inode; 119 struct gfs2_inode *ip; 120 struct gfs2_holder i_gh; 121 int error; 122 123 gfs2_holder_mark_uninitialized(&i_gh); 124 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr); 125 if (!inode) 126 return ERR_PTR(-ENOMEM); 127 128 ip = GFS2_I(inode); 129 130 if (inode->i_state & I_NEW) { 131 struct gfs2_sbd *sdp = GFS2_SB(inode); 132 struct gfs2_glock *io_gl; 133 134 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 135 if (unlikely(error)) 136 goto fail; 137 138 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { 139 /* 140 * The GL_SKIP flag indicates to skip reading the inode 141 * block. We read the inode when instantiating it 142 * after possibly checking the block type. 143 */ 144 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 145 GL_SKIP, &i_gh); 146 if (error) 147 goto fail; 148 149 error = -ESTALE; 150 if (no_formal_ino && 151 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) 152 goto fail; 153 154 if (blktype != GFS2_BLKST_FREE) { 155 error = gfs2_check_blk_type(sdp, no_addr, 156 blktype); 157 if (error) 158 goto fail; 159 } 160 } 161 162 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags); 163 164 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 165 if (unlikely(error)) 166 goto fail; 167 if (blktype != GFS2_BLKST_UNLINKED) 168 gfs2_cancel_delete_work(io_gl); 169 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 170 gfs2_glock_put(io_gl); 171 if (unlikely(error)) 172 goto fail; 173 174 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ 175 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); 176 inode->i_atime.tv_nsec = 0; 177 178 glock_set_object(ip->i_gl, ip); 179 180 if (type == DT_UNKNOWN) { 181 /* Inode glock must be locked already */ 182 error = gfs2_instantiate(&i_gh); 183 if (error) { 184 glock_clear_object(ip->i_gl, ip); 185 goto fail; 186 } 187 } else { 188 ip->i_no_formal_ino = no_formal_ino; 189 inode->i_mode = DT2IF(type); 190 } 191 192 if (gfs2_holder_initialized(&i_gh)) 193 gfs2_glock_dq_uninit(&i_gh); 194 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 195 196 gfs2_set_iop(inode); 197 unlock_new_inode(inode); 198 } 199 200 if (no_formal_ino && ip->i_no_formal_ino && 201 no_formal_ino != ip->i_no_formal_ino) { 202 iput(inode); 203 return ERR_PTR(-ESTALE); 204 } 205 206 return inode; 207 208 fail: 209 if (gfs2_holder_initialized(&ip->i_iopen_gh)) 210 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 211 if (gfs2_holder_initialized(&i_gh)) 212 gfs2_glock_dq_uninit(&i_gh); 213 iget_failed(inode); 214 return ERR_PTR(error); 215 } 216 217 /** 218 * gfs2_lookup_by_inum - look up an inode by inode number 219 * @sdp: The super block 220 * @no_addr: The inode number 221 * @no_formal_ino: The inode generation number (0 for any) 222 * @blktype: Requested block type (see gfs2_inode_lookup) 223 */ 224 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 225 u64 no_formal_ino, unsigned int blktype) 226 { 227 struct super_block *sb = sdp->sd_vfs; 228 struct inode *inode; 229 int error; 230 231 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 232 blktype); 233 if (IS_ERR(inode)) 234 return inode; 235 236 if (no_formal_ino) { 237 error = -EIO; 238 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 239 goto fail_iput; 240 } 241 return inode; 242 243 fail_iput: 244 iput(inode); 245 return ERR_PTR(error); 246 } 247 248 249 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 250 { 251 struct qstr qstr; 252 struct inode *inode; 253 gfs2_str2qstr(&qstr, name); 254 inode = gfs2_lookupi(dip, &qstr, 1); 255 /* gfs2_lookupi has inconsistent callers: vfs 256 * related routines expect NULL for no entry found, 257 * gfs2_lookup_simple callers expect ENOENT 258 * and do not check for NULL. 259 */ 260 if (inode == NULL) 261 return ERR_PTR(-ENOENT); 262 else 263 return inode; 264 } 265 266 267 /** 268 * gfs2_lookupi - Look up a filename in a directory and return its inode 269 * @dir: The inode of the directory containing the inode to look-up 270 * @name: The name of the inode to look for 271 * @is_root: If 1, ignore the caller's permissions 272 * 273 * This can be called via the VFS filldir function when NFS is doing 274 * a readdirplus and the inode which its intending to stat isn't 275 * already in cache. In this case we must not take the directory glock 276 * again, since the readdir call will have already taken that lock. 277 * 278 * Returns: errno 279 */ 280 281 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 282 int is_root) 283 { 284 struct super_block *sb = dir->i_sb; 285 struct gfs2_inode *dip = GFS2_I(dir); 286 struct gfs2_holder d_gh; 287 int error = 0; 288 struct inode *inode = NULL; 289 290 gfs2_holder_mark_uninitialized(&d_gh); 291 if (!name->len || name->len > GFS2_FNAMESIZE) 292 return ERR_PTR(-ENAMETOOLONG); 293 294 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 295 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 296 dir == d_inode(sb->s_root))) { 297 igrab(dir); 298 return dir; 299 } 300 301 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 302 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 303 if (error) 304 return ERR_PTR(error); 305 } 306 307 if (!is_root) { 308 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC); 309 if (error) 310 goto out; 311 } 312 313 inode = gfs2_dir_search(dir, name, false); 314 if (IS_ERR(inode)) 315 error = PTR_ERR(inode); 316 out: 317 if (gfs2_holder_initialized(&d_gh)) 318 gfs2_glock_dq_uninit(&d_gh); 319 if (error == -ENOENT) 320 return NULL; 321 return inode ? inode : ERR_PTR(error); 322 } 323 324 /** 325 * create_ok - OK to create a new on-disk inode here? 326 * @dip: Directory in which dinode is to be created 327 * @name: Name of new dinode 328 * @mode: 329 * 330 * Returns: errno 331 */ 332 333 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 334 umode_t mode) 335 { 336 int error; 337 338 error = gfs2_permission(&init_user_ns, &dip->i_inode, 339 MAY_WRITE | MAY_EXEC); 340 if (error) 341 return error; 342 343 /* Don't create entries in an unlinked directory */ 344 if (!dip->i_inode.i_nlink) 345 return -ENOENT; 346 347 if (dip->i_entries == (u32)-1) 348 return -EFBIG; 349 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 350 return -EMLINK; 351 352 return 0; 353 } 354 355 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 356 struct inode *inode) 357 { 358 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 359 (dip->i_inode.i_mode & S_ISUID) && 360 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 361 if (S_ISDIR(inode->i_mode)) 362 inode->i_mode |= S_ISUID; 363 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 364 inode->i_mode &= ~07111; 365 inode->i_uid = dip->i_inode.i_uid; 366 } else 367 inode->i_uid = current_fsuid(); 368 369 if (dip->i_inode.i_mode & S_ISGID) { 370 if (S_ISDIR(inode->i_mode)) 371 inode->i_mode |= S_ISGID; 372 inode->i_gid = dip->i_inode.i_gid; 373 } else 374 inode->i_gid = current_fsgid(); 375 } 376 377 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 378 { 379 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 380 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 381 int error; 382 383 error = gfs2_quota_lock_check(ip, &ap); 384 if (error) 385 goto out; 386 387 error = gfs2_inplace_reserve(ip, &ap); 388 if (error) 389 goto out_quota; 390 391 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 392 if (error) 393 goto out_ipreserv; 394 395 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); 396 ip->i_no_formal_ino = ip->i_generation; 397 ip->i_inode.i_ino = ip->i_no_addr; 398 ip->i_goal = ip->i_no_addr; 399 400 gfs2_trans_end(sdp); 401 402 out_ipreserv: 403 gfs2_inplace_release(ip); 404 out_quota: 405 gfs2_quota_unlock(ip); 406 out: 407 return error; 408 } 409 410 static void gfs2_init_dir(struct buffer_head *dibh, 411 const struct gfs2_inode *parent) 412 { 413 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 414 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 415 416 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 417 dent->de_inum = di->di_num; /* already GFS2 endian */ 418 dent->de_type = cpu_to_be16(DT_DIR); 419 420 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 421 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 422 gfs2_inum_out(parent, dent); 423 dent->de_type = cpu_to_be16(DT_DIR); 424 425 } 426 427 /** 428 * gfs2_init_xattr - Initialise an xattr block for a new inode 429 * @ip: The inode in question 430 * 431 * This sets up an empty xattr block for a new inode, ready to 432 * take any ACLs, LSM xattrs, etc. 433 */ 434 435 static void gfs2_init_xattr(struct gfs2_inode *ip) 436 { 437 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 438 struct buffer_head *bh; 439 struct gfs2_ea_header *ea; 440 441 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 442 gfs2_trans_add_meta(ip->i_gl, bh); 443 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 444 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 445 446 ea = GFS2_EA_BH2FIRST(bh); 447 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 448 ea->ea_type = GFS2_EATYPE_UNUSED; 449 ea->ea_flags = GFS2_EAFLAG_LAST; 450 451 brelse(bh); 452 } 453 454 /** 455 * init_dinode - Fill in a new dinode structure 456 * @dip: The directory this inode is being created in 457 * @ip: The inode 458 * @symname: The symlink destination (if a symlink) 459 * 460 */ 461 462 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 463 const char *symname) 464 { 465 struct gfs2_dinode *di; 466 struct buffer_head *dibh; 467 468 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 469 gfs2_trans_add_meta(ip->i_gl, dibh); 470 di = (struct gfs2_dinode *)dibh->b_data; 471 gfs2_dinode_out(ip, di); 472 473 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 474 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 475 di->__pad1 = 0; 476 di->__pad2 = 0; 477 di->__pad3 = 0; 478 memset(&di->__pad4, 0, sizeof(di->__pad4)); 479 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 480 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 481 482 switch(ip->i_inode.i_mode & S_IFMT) { 483 case S_IFDIR: 484 gfs2_init_dir(dibh, dip); 485 break; 486 case S_IFLNK: 487 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 488 break; 489 } 490 491 set_buffer_uptodate(dibh); 492 brelse(dibh); 493 } 494 495 /** 496 * gfs2_trans_da_blks - Calculate number of blocks to link inode 497 * @dip: The directory we are linking into 498 * @da: The dir add information 499 * @nr_inodes: The number of inodes involved 500 * 501 * This calculate the number of blocks we need to reserve in a 502 * transaction to link @nr_inodes into a directory. In most cases 503 * @nr_inodes will be 2 (the directory plus the inode being linked in) 504 * but in case of rename, 4 may be required. 505 * 506 * Returns: Number of blocks 507 */ 508 509 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 510 const struct gfs2_diradd *da, 511 unsigned nr_inodes) 512 { 513 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 514 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 515 } 516 517 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 518 struct gfs2_inode *ip, struct gfs2_diradd *da) 519 { 520 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 521 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 522 int error; 523 524 if (da->nr_blocks) { 525 error = gfs2_quota_lock_check(dip, &ap); 526 if (error) 527 goto fail_quota_locks; 528 529 error = gfs2_inplace_reserve(dip, &ap); 530 if (error) 531 goto fail_quota_locks; 532 533 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 534 if (error) 535 goto fail_ipreserv; 536 } else { 537 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 538 if (error) 539 goto fail_quota_locks; 540 } 541 542 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 543 544 gfs2_trans_end(sdp); 545 fail_ipreserv: 546 gfs2_inplace_release(dip); 547 fail_quota_locks: 548 gfs2_quota_unlock(dip); 549 return error; 550 } 551 552 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 553 void *fs_info) 554 { 555 const struct xattr *xattr; 556 int err = 0; 557 558 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 559 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 560 xattr->value_len, 0, 561 GFS2_EATYPE_SECURITY); 562 if (err < 0) 563 break; 564 } 565 return err; 566 } 567 568 /** 569 * gfs2_create_inode - Create a new inode 570 * @dir: The parent directory 571 * @dentry: The new dentry 572 * @file: If non-NULL, the file which is being opened 573 * @mode: The permissions on the new inode 574 * @dev: For device nodes, this is the device number 575 * @symname: For symlinks, this is the link destination 576 * @size: The initial size of the inode (ignored for directories) 577 * @excl: Force fail if inode exists 578 * 579 * Returns: 0 on success, or error code 580 */ 581 582 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 583 struct file *file, 584 umode_t mode, dev_t dev, const char *symname, 585 unsigned int size, int excl) 586 { 587 const struct qstr *name = &dentry->d_name; 588 struct posix_acl *default_acl, *acl; 589 struct gfs2_holder ghs[2]; 590 struct inode *inode = NULL; 591 struct gfs2_inode *dip = GFS2_I(dir), *ip; 592 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 593 struct gfs2_glock *io_gl; 594 int error, free_vfs_inode = 1; 595 u32 aflags = 0; 596 unsigned blocks = 1; 597 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 598 599 if (!name->len || name->len > GFS2_FNAMESIZE) 600 return -ENAMETOOLONG; 601 602 error = gfs2_qa_get(dip); 603 if (error) 604 return error; 605 606 error = gfs2_rindex_update(sdp); 607 if (error) 608 goto fail; 609 610 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 611 if (error) 612 goto fail; 613 gfs2_holder_mark_uninitialized(ghs + 1); 614 615 error = create_ok(dip, name, mode); 616 if (error) 617 goto fail_gunlock; 618 619 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 620 error = PTR_ERR(inode); 621 if (!IS_ERR(inode)) { 622 if (S_ISDIR(inode->i_mode)) { 623 iput(inode); 624 inode = ERR_PTR(-EISDIR); 625 goto fail_gunlock; 626 } 627 d_instantiate(dentry, inode); 628 error = 0; 629 if (file) { 630 if (S_ISREG(inode->i_mode)) 631 error = finish_open(file, dentry, gfs2_open_common); 632 else 633 error = finish_no_open(file, NULL); 634 } 635 gfs2_glock_dq_uninit(ghs); 636 goto fail; 637 } else if (error != -ENOENT) { 638 goto fail_gunlock; 639 } 640 641 error = gfs2_diradd_alloc_required(dir, name, &da); 642 if (error < 0) 643 goto fail_gunlock; 644 645 inode = new_inode(sdp->sd_vfs); 646 error = -ENOMEM; 647 if (!inode) 648 goto fail_gunlock; 649 650 error = posix_acl_create(dir, &mode, &default_acl, &acl); 651 if (error) 652 goto fail_gunlock; 653 654 ip = GFS2_I(inode); 655 error = gfs2_qa_get(ip); 656 if (error) 657 goto fail_free_acls; 658 659 inode->i_mode = mode; 660 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 661 inode->i_rdev = dev; 662 inode->i_size = size; 663 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 664 munge_mode_uid_gid(dip, inode); 665 check_and_update_goal(dip); 666 ip->i_goal = dip->i_goal; 667 ip->i_diskflags = 0; 668 ip->i_eattr = 0; 669 ip->i_height = 0; 670 ip->i_depth = 0; 671 ip->i_entries = 0; 672 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 673 674 switch(mode & S_IFMT) { 675 case S_IFREG: 676 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 677 gfs2_tune_get(sdp, gt_new_files_jdata)) 678 ip->i_diskflags |= GFS2_DIF_JDATA; 679 gfs2_set_aops(inode); 680 break; 681 case S_IFDIR: 682 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 683 ip->i_diskflags |= GFS2_DIF_JDATA; 684 ip->i_entries = 2; 685 break; 686 } 687 688 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 689 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 690 ip->i_diskflags |= GFS2_DIF_SYSTEM; 691 692 gfs2_set_inode_flags(inode); 693 694 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 695 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 696 aflags |= GFS2_AF_ORLOV; 697 698 if (default_acl || acl) 699 blocks++; 700 701 error = alloc_dinode(ip, aflags, &blocks); 702 if (error) 703 goto fail_free_inode; 704 705 gfs2_set_inode_blocks(inode, blocks); 706 707 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 708 if (error) 709 goto fail_free_inode; 710 711 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 712 if (error) 713 goto fail_free_inode; 714 gfs2_cancel_delete_work(io_gl); 715 716 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); 717 BUG_ON(error); 718 719 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 720 if (error) 721 goto fail_gunlock2; 722 723 error = gfs2_trans_begin(sdp, blocks, 0); 724 if (error) 725 goto fail_gunlock2; 726 727 if (blocks > 1) { 728 ip->i_eattr = ip->i_no_addr + 1; 729 gfs2_init_xattr(ip); 730 } 731 init_dinode(dip, ip, symname); 732 gfs2_trans_end(sdp); 733 734 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 735 if (error) 736 goto fail_gunlock2; 737 738 glock_set_object(ip->i_gl, ip); 739 glock_set_object(io_gl, ip); 740 gfs2_set_iop(inode); 741 742 free_vfs_inode = 0; /* After this point, the inode is no longer 743 considered free. Any failures need to undo 744 the gfs2 structures. */ 745 if (default_acl) { 746 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 747 if (error) 748 goto fail_gunlock3; 749 posix_acl_release(default_acl); 750 default_acl = NULL; 751 } 752 if (acl) { 753 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 754 if (error) 755 goto fail_gunlock3; 756 posix_acl_release(acl); 757 acl = NULL; 758 } 759 760 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 761 &gfs2_initxattrs, NULL); 762 if (error) 763 goto fail_gunlock3; 764 765 error = link_dinode(dip, name, ip, &da); 766 if (error) 767 goto fail_gunlock3; 768 769 mark_inode_dirty(inode); 770 d_instantiate(dentry, inode); 771 /* After instantiate, errors should result in evict which will destroy 772 * both inode and iopen glocks properly. */ 773 if (file) { 774 file->f_mode |= FMODE_CREATED; 775 error = finish_open(file, dentry, gfs2_open_common); 776 } 777 gfs2_glock_dq_uninit(ghs); 778 gfs2_qa_put(ip); 779 gfs2_glock_dq_uninit(ghs + 1); 780 gfs2_glock_put(io_gl); 781 gfs2_qa_put(dip); 782 unlock_new_inode(inode); 783 return error; 784 785 fail_gunlock3: 786 glock_clear_object(ip->i_gl, ip); 787 glock_clear_object(io_gl, ip); 788 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 789 fail_gunlock2: 790 gfs2_glock_put(io_gl); 791 fail_free_inode: 792 if (ip->i_gl) { 793 if (free_vfs_inode) /* else evict will do the put for us */ 794 gfs2_glock_put(ip->i_gl); 795 } 796 gfs2_rs_delete(ip, NULL); 797 gfs2_qa_put(ip); 798 fail_free_acls: 799 posix_acl_release(default_acl); 800 posix_acl_release(acl); 801 fail_gunlock: 802 gfs2_dir_no_add(&da); 803 gfs2_glock_dq_uninit(ghs); 804 if (!IS_ERR_OR_NULL(inode)) { 805 clear_nlink(inode); 806 if (!free_vfs_inode) 807 mark_inode_dirty(inode); 808 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 809 &GFS2_I(inode)->i_flags); 810 if (inode->i_state & I_NEW) 811 iget_failed(inode); 812 else 813 iput(inode); 814 } 815 if (gfs2_holder_initialized(ghs + 1)) 816 gfs2_glock_dq_uninit(ghs + 1); 817 fail: 818 gfs2_qa_put(dip); 819 return error; 820 } 821 822 /** 823 * gfs2_create - Create a file 824 * @mnt_userns: User namespace of the mount the inode was found from 825 * @dir: The directory in which to create the file 826 * @dentry: The dentry of the new file 827 * @mode: The mode of the new file 828 * @excl: Force fail if inode exists 829 * 830 * Returns: errno 831 */ 832 833 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir, 834 struct dentry *dentry, umode_t mode, bool excl) 835 { 836 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 837 } 838 839 /** 840 * __gfs2_lookup - Look up a filename in a directory and return its inode 841 * @dir: The directory inode 842 * @dentry: The dentry of the new inode 843 * @file: File to be opened 844 * 845 * 846 * Returns: errno 847 */ 848 849 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 850 struct file *file) 851 { 852 struct inode *inode; 853 struct dentry *d; 854 struct gfs2_holder gh; 855 struct gfs2_glock *gl; 856 int error; 857 858 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 859 if (inode == NULL) { 860 d_add(dentry, NULL); 861 return NULL; 862 } 863 if (IS_ERR(inode)) 864 return ERR_CAST(inode); 865 866 gl = GFS2_I(inode)->i_gl; 867 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 868 if (error) { 869 iput(inode); 870 return ERR_PTR(error); 871 } 872 873 d = d_splice_alias(inode, dentry); 874 if (IS_ERR(d)) { 875 gfs2_glock_dq_uninit(&gh); 876 return d; 877 } 878 if (file && S_ISREG(inode->i_mode)) 879 error = finish_open(file, dentry, gfs2_open_common); 880 881 gfs2_glock_dq_uninit(&gh); 882 if (error) { 883 dput(d); 884 return ERR_PTR(error); 885 } 886 return d; 887 } 888 889 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 890 unsigned flags) 891 { 892 return __gfs2_lookup(dir, dentry, NULL); 893 } 894 895 /** 896 * gfs2_link - Link to a file 897 * @old_dentry: The inode to link 898 * @dir: Add link to this directory 899 * @dentry: The name of the link 900 * 901 * Link the inode in "old_dentry" into the directory "dir" with the 902 * name in "dentry". 903 * 904 * Returns: errno 905 */ 906 907 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 908 struct dentry *dentry) 909 { 910 struct gfs2_inode *dip = GFS2_I(dir); 911 struct gfs2_sbd *sdp = GFS2_SB(dir); 912 struct inode *inode = d_inode(old_dentry); 913 struct gfs2_inode *ip = GFS2_I(inode); 914 struct gfs2_holder ghs[2]; 915 struct buffer_head *dibh; 916 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 917 int error; 918 919 if (S_ISDIR(inode->i_mode)) 920 return -EPERM; 921 922 error = gfs2_qa_get(dip); 923 if (error) 924 return error; 925 926 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 927 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 928 929 error = gfs2_glock_nq(ghs); /* parent */ 930 if (error) 931 goto out_parent; 932 933 error = gfs2_glock_nq(ghs + 1); /* child */ 934 if (error) 935 goto out_child; 936 937 error = -ENOENT; 938 if (inode->i_nlink == 0) 939 goto out_gunlock; 940 941 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 942 if (error) 943 goto out_gunlock; 944 945 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 946 switch (error) { 947 case -ENOENT: 948 break; 949 case 0: 950 error = -EEXIST; 951 goto out_gunlock; 952 default: 953 goto out_gunlock; 954 } 955 956 error = -EINVAL; 957 if (!dip->i_inode.i_nlink) 958 goto out_gunlock; 959 error = -EFBIG; 960 if (dip->i_entries == (u32)-1) 961 goto out_gunlock; 962 error = -EPERM; 963 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 964 goto out_gunlock; 965 error = -EINVAL; 966 if (!ip->i_inode.i_nlink) 967 goto out_gunlock; 968 error = -EMLINK; 969 if (ip->i_inode.i_nlink == (u32)-1) 970 goto out_gunlock; 971 972 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 973 if (error < 0) 974 goto out_gunlock; 975 976 if (da.nr_blocks) { 977 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 978 error = gfs2_quota_lock_check(dip, &ap); 979 if (error) 980 goto out_gunlock; 981 982 error = gfs2_inplace_reserve(dip, &ap); 983 if (error) 984 goto out_gunlock_q; 985 986 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 987 if (error) 988 goto out_ipres; 989 } else { 990 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 991 if (error) 992 goto out_ipres; 993 } 994 995 error = gfs2_meta_inode_buffer(ip, &dibh); 996 if (error) 997 goto out_end_trans; 998 999 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1000 if (error) 1001 goto out_brelse; 1002 1003 gfs2_trans_add_meta(ip->i_gl, dibh); 1004 inc_nlink(&ip->i_inode); 1005 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1006 ihold(inode); 1007 d_instantiate(dentry, inode); 1008 mark_inode_dirty(inode); 1009 1010 out_brelse: 1011 brelse(dibh); 1012 out_end_trans: 1013 gfs2_trans_end(sdp); 1014 out_ipres: 1015 if (da.nr_blocks) 1016 gfs2_inplace_release(dip); 1017 out_gunlock_q: 1018 if (da.nr_blocks) 1019 gfs2_quota_unlock(dip); 1020 out_gunlock: 1021 gfs2_dir_no_add(&da); 1022 gfs2_glock_dq(ghs + 1); 1023 out_child: 1024 gfs2_glock_dq(ghs); 1025 out_parent: 1026 gfs2_qa_put(dip); 1027 gfs2_holder_uninit(ghs); 1028 gfs2_holder_uninit(ghs + 1); 1029 return error; 1030 } 1031 1032 /* 1033 * gfs2_unlink_ok - check to see that a inode is still in a directory 1034 * @dip: the directory 1035 * @name: the name of the file 1036 * @ip: the inode 1037 * 1038 * Assumes that the lock on (at least) @dip is held. 1039 * 1040 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1041 */ 1042 1043 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1044 const struct gfs2_inode *ip) 1045 { 1046 int error; 1047 1048 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1049 return -EPERM; 1050 1051 if ((dip->i_inode.i_mode & S_ISVTX) && 1052 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1053 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1054 return -EPERM; 1055 1056 if (IS_APPEND(&dip->i_inode)) 1057 return -EPERM; 1058 1059 error = gfs2_permission(&init_user_ns, &dip->i_inode, 1060 MAY_WRITE | MAY_EXEC); 1061 if (error) 1062 return error; 1063 1064 return gfs2_dir_check(&dip->i_inode, name, ip); 1065 } 1066 1067 /** 1068 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1069 * @dip: The parent directory 1070 * @dentry: The dentry to unlink 1071 * 1072 * Called with all the locks and in a transaction. This will only be 1073 * called for a directory after it has been checked to ensure it is empty. 1074 * 1075 * Returns: 0 on success, or an error 1076 */ 1077 1078 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1079 const struct dentry *dentry) 1080 { 1081 struct inode *inode = d_inode(dentry); 1082 struct gfs2_inode *ip = GFS2_I(inode); 1083 int error; 1084 1085 error = gfs2_dir_del(dip, dentry); 1086 if (error) 1087 return error; 1088 1089 ip->i_entries = 0; 1090 inode->i_ctime = current_time(inode); 1091 if (S_ISDIR(inode->i_mode)) 1092 clear_nlink(inode); 1093 else 1094 drop_nlink(inode); 1095 mark_inode_dirty(inode); 1096 if (inode->i_nlink == 0) 1097 gfs2_unlink_di(inode); 1098 return 0; 1099 } 1100 1101 1102 /** 1103 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1104 * @dir: The inode of the directory containing the inode to unlink 1105 * @dentry: The file itself 1106 * 1107 * This routine uses the type of the inode as a flag to figure out 1108 * whether this is an unlink or an rmdir. 1109 * 1110 * Returns: errno 1111 */ 1112 1113 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1114 { 1115 struct gfs2_inode *dip = GFS2_I(dir); 1116 struct gfs2_sbd *sdp = GFS2_SB(dir); 1117 struct inode *inode = d_inode(dentry); 1118 struct gfs2_inode *ip = GFS2_I(inode); 1119 struct gfs2_holder ghs[3]; 1120 struct gfs2_rgrpd *rgd; 1121 int error; 1122 1123 error = gfs2_rindex_update(sdp); 1124 if (error) 1125 return error; 1126 1127 error = -EROFS; 1128 1129 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1130 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1131 1132 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1133 if (!rgd) 1134 goto out_inodes; 1135 1136 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2); 1137 1138 1139 error = gfs2_glock_nq(ghs); /* parent */ 1140 if (error) 1141 goto out_parent; 1142 1143 error = gfs2_glock_nq(ghs + 1); /* child */ 1144 if (error) 1145 goto out_child; 1146 1147 error = -ENOENT; 1148 if (inode->i_nlink == 0) 1149 goto out_rgrp; 1150 1151 if (S_ISDIR(inode->i_mode)) { 1152 error = -ENOTEMPTY; 1153 if (ip->i_entries > 2 || inode->i_nlink > 2) 1154 goto out_rgrp; 1155 } 1156 1157 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1158 if (error) 1159 goto out_rgrp; 1160 1161 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1162 if (error) 1163 goto out_gunlock; 1164 1165 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1166 if (error) 1167 goto out_gunlock; 1168 1169 error = gfs2_unlink_inode(dip, dentry); 1170 gfs2_trans_end(sdp); 1171 1172 out_gunlock: 1173 gfs2_glock_dq(ghs + 2); 1174 out_rgrp: 1175 gfs2_glock_dq(ghs + 1); 1176 out_child: 1177 gfs2_glock_dq(ghs); 1178 out_parent: 1179 gfs2_holder_uninit(ghs + 2); 1180 out_inodes: 1181 gfs2_holder_uninit(ghs + 1); 1182 gfs2_holder_uninit(ghs); 1183 return error; 1184 } 1185 1186 /** 1187 * gfs2_symlink - Create a symlink 1188 * @mnt_userns: User namespace of the mount the inode was found from 1189 * @dir: The directory to create the symlink in 1190 * @dentry: The dentry to put the symlink in 1191 * @symname: The thing which the link points to 1192 * 1193 * Returns: errno 1194 */ 1195 1196 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1197 struct dentry *dentry, const char *symname) 1198 { 1199 unsigned int size; 1200 1201 size = strlen(symname); 1202 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1203 return -ENAMETOOLONG; 1204 1205 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1206 } 1207 1208 /** 1209 * gfs2_mkdir - Make a directory 1210 * @mnt_userns: User namespace of the mount the inode was found from 1211 * @dir: The parent directory of the new one 1212 * @dentry: The dentry of the new directory 1213 * @mode: The mode of the new directory 1214 * 1215 * Returns: errno 1216 */ 1217 1218 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 1219 struct dentry *dentry, umode_t mode) 1220 { 1221 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1222 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1223 } 1224 1225 /** 1226 * gfs2_mknod - Make a special file 1227 * @mnt_userns: User namespace of the mount the inode was found from 1228 * @dir: The directory in which the special file will reside 1229 * @dentry: The dentry of the special file 1230 * @mode: The mode of the special file 1231 * @dev: The device specification of the special file 1232 * 1233 */ 1234 1235 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1236 struct dentry *dentry, umode_t mode, dev_t dev) 1237 { 1238 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1239 } 1240 1241 /** 1242 * gfs2_atomic_open - Atomically open a file 1243 * @dir: The directory 1244 * @dentry: The proposed new entry 1245 * @file: The proposed new struct file 1246 * @flags: open flags 1247 * @mode: File mode 1248 * 1249 * Returns: error code or 0 for success 1250 */ 1251 1252 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1253 struct file *file, unsigned flags, 1254 umode_t mode) 1255 { 1256 struct dentry *d; 1257 bool excl = !!(flags & O_EXCL); 1258 1259 if (!d_in_lookup(dentry)) 1260 goto skip_lookup; 1261 1262 d = __gfs2_lookup(dir, dentry, file); 1263 if (IS_ERR(d)) 1264 return PTR_ERR(d); 1265 if (d != NULL) 1266 dentry = d; 1267 if (d_really_is_positive(dentry)) { 1268 if (!(file->f_mode & FMODE_OPENED)) 1269 return finish_no_open(file, d); 1270 dput(d); 1271 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1272 } 1273 1274 BUG_ON(d != NULL); 1275 1276 skip_lookup: 1277 if (!(flags & O_CREAT)) 1278 return -ENOENT; 1279 1280 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1281 } 1282 1283 /* 1284 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1285 * @this: move this 1286 * @to: to here 1287 * 1288 * Follow @to back to the root and make sure we don't encounter @this 1289 * Assumes we already hold the rename lock. 1290 * 1291 * Returns: errno 1292 */ 1293 1294 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1295 { 1296 struct inode *dir = &to->i_inode; 1297 struct super_block *sb = dir->i_sb; 1298 struct inode *tmp; 1299 int error = 0; 1300 1301 igrab(dir); 1302 1303 for (;;) { 1304 if (dir == &this->i_inode) { 1305 error = -EINVAL; 1306 break; 1307 } 1308 if (dir == d_inode(sb->s_root)) { 1309 error = 0; 1310 break; 1311 } 1312 1313 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1314 if (!tmp) { 1315 error = -ENOENT; 1316 break; 1317 } 1318 if (IS_ERR(tmp)) { 1319 error = PTR_ERR(tmp); 1320 break; 1321 } 1322 1323 iput(dir); 1324 dir = tmp; 1325 } 1326 1327 iput(dir); 1328 1329 return error; 1330 } 1331 1332 /** 1333 * update_moved_ino - Update an inode that's being moved 1334 * @ip: The inode being moved 1335 * @ndip: The parent directory of the new filename 1336 * @dir_rename: True of ip is a directory 1337 * 1338 * Returns: errno 1339 */ 1340 1341 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1342 int dir_rename) 1343 { 1344 if (dir_rename) 1345 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1346 1347 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1348 mark_inode_dirty_sync(&ip->i_inode); 1349 return 0; 1350 } 1351 1352 1353 /** 1354 * gfs2_rename - Rename a file 1355 * @odir: Parent directory of old file name 1356 * @odentry: The old dentry of the file 1357 * @ndir: Parent directory of new file name 1358 * @ndentry: The new dentry of the file 1359 * 1360 * Returns: errno 1361 */ 1362 1363 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1364 struct inode *ndir, struct dentry *ndentry) 1365 { 1366 struct gfs2_inode *odip = GFS2_I(odir); 1367 struct gfs2_inode *ndip = GFS2_I(ndir); 1368 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1369 struct gfs2_inode *nip = NULL; 1370 struct gfs2_sbd *sdp = GFS2_SB(odir); 1371 struct gfs2_holder ghs[4], r_gh, rd_gh; 1372 struct gfs2_rgrpd *nrgd; 1373 unsigned int num_gh; 1374 int dir_rename = 0; 1375 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1376 unsigned int x; 1377 int error; 1378 1379 gfs2_holder_mark_uninitialized(&r_gh); 1380 gfs2_holder_mark_uninitialized(&rd_gh); 1381 if (d_really_is_positive(ndentry)) { 1382 nip = GFS2_I(d_inode(ndentry)); 1383 if (ip == nip) 1384 return 0; 1385 } 1386 1387 error = gfs2_rindex_update(sdp); 1388 if (error) 1389 return error; 1390 1391 error = gfs2_qa_get(ndip); 1392 if (error) 1393 return error; 1394 1395 if (odip != ndip) { 1396 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1397 0, &r_gh); 1398 if (error) 1399 goto out; 1400 1401 if (S_ISDIR(ip->i_inode.i_mode)) { 1402 dir_rename = 1; 1403 /* don't move a directory into its subdir */ 1404 error = gfs2_ok_to_move(ip, ndip); 1405 if (error) 1406 goto out_gunlock_r; 1407 } 1408 } 1409 1410 num_gh = 1; 1411 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1412 if (odip != ndip) { 1413 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1414 ghs + num_gh); 1415 num_gh++; 1416 } 1417 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1418 num_gh++; 1419 1420 if (nip) { 1421 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1422 ghs + num_gh); 1423 num_gh++; 1424 } 1425 1426 for (x = 0; x < num_gh; x++) { 1427 error = gfs2_glock_nq(ghs + x); 1428 if (error) 1429 goto out_gunlock; 1430 } 1431 error = gfs2_glock_async_wait(num_gh, ghs); 1432 if (error) 1433 goto out_gunlock; 1434 1435 if (nip) { 1436 /* Grab the resource group glock for unlink flag twiddling. 1437 * This is the case where the target dinode already exists 1438 * so we unlink before doing the rename. 1439 */ 1440 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1441 if (!nrgd) { 1442 error = -ENOENT; 1443 goto out_gunlock; 1444 } 1445 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1446 LM_FLAG_NODE_SCOPE, &rd_gh); 1447 if (error) 1448 goto out_gunlock; 1449 } 1450 1451 error = -ENOENT; 1452 if (ip->i_inode.i_nlink == 0) 1453 goto out_gunlock; 1454 1455 /* Check out the old directory */ 1456 1457 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1458 if (error) 1459 goto out_gunlock; 1460 1461 /* Check out the new directory */ 1462 1463 if (nip) { 1464 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1465 if (error) 1466 goto out_gunlock; 1467 1468 if (nip->i_inode.i_nlink == 0) { 1469 error = -EAGAIN; 1470 goto out_gunlock; 1471 } 1472 1473 if (S_ISDIR(nip->i_inode.i_mode)) { 1474 if (nip->i_entries < 2) { 1475 gfs2_consist_inode(nip); 1476 error = -EIO; 1477 goto out_gunlock; 1478 } 1479 if (nip->i_entries > 2) { 1480 error = -ENOTEMPTY; 1481 goto out_gunlock; 1482 } 1483 } 1484 } else { 1485 error = gfs2_permission(&init_user_ns, ndir, 1486 MAY_WRITE | MAY_EXEC); 1487 if (error) 1488 goto out_gunlock; 1489 1490 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1491 switch (error) { 1492 case -ENOENT: 1493 error = 0; 1494 break; 1495 case 0: 1496 error = -EEXIST; 1497 goto out_gunlock; 1498 default: 1499 goto out_gunlock; 1500 } 1501 1502 if (odip != ndip) { 1503 if (!ndip->i_inode.i_nlink) { 1504 error = -ENOENT; 1505 goto out_gunlock; 1506 } 1507 if (ndip->i_entries == (u32)-1) { 1508 error = -EFBIG; 1509 goto out_gunlock; 1510 } 1511 if (S_ISDIR(ip->i_inode.i_mode) && 1512 ndip->i_inode.i_nlink == (u32)-1) { 1513 error = -EMLINK; 1514 goto out_gunlock; 1515 } 1516 } 1517 } 1518 1519 /* Check out the dir to be renamed */ 1520 1521 if (dir_rename) { 1522 error = gfs2_permission(&init_user_ns, d_inode(odentry), 1523 MAY_WRITE); 1524 if (error) 1525 goto out_gunlock; 1526 } 1527 1528 if (nip == NULL) { 1529 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1530 if (error) 1531 goto out_gunlock; 1532 } 1533 1534 if (da.nr_blocks) { 1535 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1536 error = gfs2_quota_lock_check(ndip, &ap); 1537 if (error) 1538 goto out_gunlock; 1539 1540 error = gfs2_inplace_reserve(ndip, &ap); 1541 if (error) 1542 goto out_gunlock_q; 1543 1544 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1545 4 * RES_LEAF + 4, 0); 1546 if (error) 1547 goto out_ipreserv; 1548 } else { 1549 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1550 5 * RES_LEAF + 4, 0); 1551 if (error) 1552 goto out_gunlock; 1553 } 1554 1555 /* Remove the target file, if it exists */ 1556 1557 if (nip) 1558 error = gfs2_unlink_inode(ndip, ndentry); 1559 1560 error = update_moved_ino(ip, ndip, dir_rename); 1561 if (error) 1562 goto out_end_trans; 1563 1564 error = gfs2_dir_del(odip, odentry); 1565 if (error) 1566 goto out_end_trans; 1567 1568 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1569 if (error) 1570 goto out_end_trans; 1571 1572 out_end_trans: 1573 gfs2_trans_end(sdp); 1574 out_ipreserv: 1575 if (da.nr_blocks) 1576 gfs2_inplace_release(ndip); 1577 out_gunlock_q: 1578 if (da.nr_blocks) 1579 gfs2_quota_unlock(ndip); 1580 out_gunlock: 1581 gfs2_dir_no_add(&da); 1582 if (gfs2_holder_initialized(&rd_gh)) 1583 gfs2_glock_dq_uninit(&rd_gh); 1584 1585 while (x--) { 1586 if (gfs2_holder_queued(ghs + x)) 1587 gfs2_glock_dq(ghs + x); 1588 gfs2_holder_uninit(ghs + x); 1589 } 1590 out_gunlock_r: 1591 if (gfs2_holder_initialized(&r_gh)) 1592 gfs2_glock_dq_uninit(&r_gh); 1593 out: 1594 gfs2_qa_put(ndip); 1595 return error; 1596 } 1597 1598 /** 1599 * gfs2_exchange - exchange two files 1600 * @odir: Parent directory of old file name 1601 * @odentry: The old dentry of the file 1602 * @ndir: Parent directory of new file name 1603 * @ndentry: The new dentry of the file 1604 * @flags: The rename flags 1605 * 1606 * Returns: errno 1607 */ 1608 1609 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1610 struct inode *ndir, struct dentry *ndentry, 1611 unsigned int flags) 1612 { 1613 struct gfs2_inode *odip = GFS2_I(odir); 1614 struct gfs2_inode *ndip = GFS2_I(ndir); 1615 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1616 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1617 struct gfs2_sbd *sdp = GFS2_SB(odir); 1618 struct gfs2_holder ghs[4], r_gh; 1619 unsigned int num_gh; 1620 unsigned int x; 1621 umode_t old_mode = oip->i_inode.i_mode; 1622 umode_t new_mode = nip->i_inode.i_mode; 1623 int error; 1624 1625 gfs2_holder_mark_uninitialized(&r_gh); 1626 error = gfs2_rindex_update(sdp); 1627 if (error) 1628 return error; 1629 1630 if (odip != ndip) { 1631 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1632 0, &r_gh); 1633 if (error) 1634 goto out; 1635 1636 if (S_ISDIR(old_mode)) { 1637 /* don't move a directory into its subdir */ 1638 error = gfs2_ok_to_move(oip, ndip); 1639 if (error) 1640 goto out_gunlock_r; 1641 } 1642 1643 if (S_ISDIR(new_mode)) { 1644 /* don't move a directory into its subdir */ 1645 error = gfs2_ok_to_move(nip, odip); 1646 if (error) 1647 goto out_gunlock_r; 1648 } 1649 } 1650 1651 num_gh = 1; 1652 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1653 if (odip != ndip) { 1654 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1655 ghs + num_gh); 1656 num_gh++; 1657 } 1658 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1659 num_gh++; 1660 1661 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1662 num_gh++; 1663 1664 for (x = 0; x < num_gh; x++) { 1665 error = gfs2_glock_nq(ghs + x); 1666 if (error) 1667 goto out_gunlock; 1668 } 1669 1670 error = gfs2_glock_async_wait(num_gh, ghs); 1671 if (error) 1672 goto out_gunlock; 1673 1674 error = -ENOENT; 1675 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1676 goto out_gunlock; 1677 1678 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1679 if (error) 1680 goto out_gunlock; 1681 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1682 if (error) 1683 goto out_gunlock; 1684 1685 if (S_ISDIR(old_mode)) { 1686 error = gfs2_permission(&init_user_ns, odentry->d_inode, 1687 MAY_WRITE); 1688 if (error) 1689 goto out_gunlock; 1690 } 1691 if (S_ISDIR(new_mode)) { 1692 error = gfs2_permission(&init_user_ns, ndentry->d_inode, 1693 MAY_WRITE); 1694 if (error) 1695 goto out_gunlock; 1696 } 1697 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1698 if (error) 1699 goto out_gunlock; 1700 1701 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1702 if (error) 1703 goto out_end_trans; 1704 1705 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1706 if (error) 1707 goto out_end_trans; 1708 1709 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1710 IF2DT(old_mode)); 1711 if (error) 1712 goto out_end_trans; 1713 1714 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1715 IF2DT(new_mode)); 1716 if (error) 1717 goto out_end_trans; 1718 1719 if (odip != ndip) { 1720 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1721 inc_nlink(&odip->i_inode); 1722 drop_nlink(&ndip->i_inode); 1723 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1724 inc_nlink(&ndip->i_inode); 1725 drop_nlink(&odip->i_inode); 1726 } 1727 } 1728 mark_inode_dirty(&ndip->i_inode); 1729 if (odip != ndip) 1730 mark_inode_dirty(&odip->i_inode); 1731 1732 out_end_trans: 1733 gfs2_trans_end(sdp); 1734 out_gunlock: 1735 while (x--) { 1736 if (gfs2_holder_queued(ghs + x)) 1737 gfs2_glock_dq(ghs + x); 1738 gfs2_holder_uninit(ghs + x); 1739 } 1740 out_gunlock_r: 1741 if (gfs2_holder_initialized(&r_gh)) 1742 gfs2_glock_dq_uninit(&r_gh); 1743 out: 1744 return error; 1745 } 1746 1747 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir, 1748 struct dentry *odentry, struct inode *ndir, 1749 struct dentry *ndentry, unsigned int flags) 1750 { 1751 flags &= ~RENAME_NOREPLACE; 1752 1753 if (flags & ~RENAME_EXCHANGE) 1754 return -EINVAL; 1755 1756 if (flags & RENAME_EXCHANGE) 1757 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1758 1759 return gfs2_rename(odir, odentry, ndir, ndentry); 1760 } 1761 1762 /** 1763 * gfs2_get_link - Follow a symbolic link 1764 * @dentry: The dentry of the link 1765 * @inode: The inode of the link 1766 * @done: destructor for return value 1767 * 1768 * This can handle symlinks of any size. 1769 * 1770 * Returns: 0 on success or error code 1771 */ 1772 1773 static const char *gfs2_get_link(struct dentry *dentry, 1774 struct inode *inode, 1775 struct delayed_call *done) 1776 { 1777 struct gfs2_inode *ip = GFS2_I(inode); 1778 struct gfs2_holder i_gh; 1779 struct buffer_head *dibh; 1780 unsigned int size; 1781 char *buf; 1782 int error; 1783 1784 if (!dentry) 1785 return ERR_PTR(-ECHILD); 1786 1787 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1788 error = gfs2_glock_nq(&i_gh); 1789 if (error) { 1790 gfs2_holder_uninit(&i_gh); 1791 return ERR_PTR(error); 1792 } 1793 1794 size = (unsigned int)i_size_read(&ip->i_inode); 1795 if (size == 0) { 1796 gfs2_consist_inode(ip); 1797 buf = ERR_PTR(-EIO); 1798 goto out; 1799 } 1800 1801 error = gfs2_meta_inode_buffer(ip, &dibh); 1802 if (error) { 1803 buf = ERR_PTR(error); 1804 goto out; 1805 } 1806 1807 buf = kzalloc(size + 1, GFP_NOFS); 1808 if (!buf) 1809 buf = ERR_PTR(-ENOMEM); 1810 else 1811 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1812 brelse(dibh); 1813 out: 1814 gfs2_glock_dq_uninit(&i_gh); 1815 if (!IS_ERR(buf)) 1816 set_delayed_call(done, kfree_link, buf); 1817 return buf; 1818 } 1819 1820 /** 1821 * gfs2_permission 1822 * @mnt_userns: User namespace of the mount the inode was found from 1823 * @inode: The inode 1824 * @mask: The mask to be tested 1825 * 1826 * This may be called from the VFS directly, or from within GFS2 with the 1827 * inode locked, so we look to see if the glock is already locked and only 1828 * lock the glock if its not already been done. 1829 * 1830 * Returns: errno 1831 */ 1832 1833 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode, 1834 int mask) 1835 { 1836 struct gfs2_inode *ip; 1837 struct gfs2_holder i_gh; 1838 int error; 1839 1840 gfs2_holder_mark_uninitialized(&i_gh); 1841 ip = GFS2_I(inode); 1842 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1843 if (mask & MAY_NOT_BLOCK) 1844 return -ECHILD; 1845 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1846 if (error) 1847 return error; 1848 } 1849 1850 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1851 error = -EPERM; 1852 else 1853 error = generic_permission(&init_user_ns, inode, mask); 1854 if (gfs2_holder_initialized(&i_gh)) 1855 gfs2_glock_dq_uninit(&i_gh); 1856 1857 return error; 1858 } 1859 1860 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1861 { 1862 setattr_copy(&init_user_ns, inode, attr); 1863 mark_inode_dirty(inode); 1864 return 0; 1865 } 1866 1867 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1868 { 1869 int error; 1870 1871 if (current->journal_info) 1872 return __gfs2_setattr_simple(inode, attr); 1873 1874 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1875 if (error) 1876 return error; 1877 1878 error = __gfs2_setattr_simple(inode, attr); 1879 gfs2_trans_end(GFS2_SB(inode)); 1880 return error; 1881 } 1882 1883 static int setattr_chown(struct inode *inode, struct iattr *attr) 1884 { 1885 struct gfs2_inode *ip = GFS2_I(inode); 1886 struct gfs2_sbd *sdp = GFS2_SB(inode); 1887 kuid_t ouid, nuid; 1888 kgid_t ogid, ngid; 1889 int error; 1890 struct gfs2_alloc_parms ap; 1891 1892 ouid = inode->i_uid; 1893 ogid = inode->i_gid; 1894 nuid = attr->ia_uid; 1895 ngid = attr->ia_gid; 1896 1897 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1898 ouid = nuid = NO_UID_QUOTA_CHANGE; 1899 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1900 ogid = ngid = NO_GID_QUOTA_CHANGE; 1901 error = gfs2_qa_get(ip); 1902 if (error) 1903 return error; 1904 1905 error = gfs2_rindex_update(sdp); 1906 if (error) 1907 goto out; 1908 1909 error = gfs2_quota_lock(ip, nuid, ngid); 1910 if (error) 1911 goto out; 1912 1913 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1914 1915 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1916 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1917 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1918 if (error) 1919 goto out_gunlock_q; 1920 } 1921 1922 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1923 if (error) 1924 goto out_gunlock_q; 1925 1926 error = gfs2_setattr_simple(inode, attr); 1927 if (error) 1928 goto out_end_trans; 1929 1930 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1931 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1932 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1933 gfs2_quota_change(ip, ap.target, nuid, ngid); 1934 } 1935 1936 out_end_trans: 1937 gfs2_trans_end(sdp); 1938 out_gunlock_q: 1939 gfs2_quota_unlock(ip); 1940 out: 1941 gfs2_qa_put(ip); 1942 return error; 1943 } 1944 1945 /** 1946 * gfs2_setattr - Change attributes on an inode 1947 * @mnt_userns: User namespace of the mount the inode was found from 1948 * @dentry: The dentry which is changing 1949 * @attr: The structure describing the change 1950 * 1951 * The VFS layer wants to change one or more of an inodes attributes. Write 1952 * that change out to disk. 1953 * 1954 * Returns: errno 1955 */ 1956 1957 static int gfs2_setattr(struct user_namespace *mnt_userns, 1958 struct dentry *dentry, struct iattr *attr) 1959 { 1960 struct inode *inode = d_inode(dentry); 1961 struct gfs2_inode *ip = GFS2_I(inode); 1962 struct gfs2_holder i_gh; 1963 int error; 1964 1965 error = gfs2_qa_get(ip); 1966 if (error) 1967 return error; 1968 1969 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1970 if (error) 1971 goto out; 1972 1973 error = may_setattr(&init_user_ns, inode, attr->ia_valid); 1974 if (error) 1975 goto error; 1976 1977 error = setattr_prepare(&init_user_ns, dentry, attr); 1978 if (error) 1979 goto error; 1980 1981 if (attr->ia_valid & ATTR_SIZE) 1982 error = gfs2_setattr_size(inode, attr->ia_size); 1983 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1984 error = setattr_chown(inode, attr); 1985 else { 1986 error = gfs2_setattr_simple(inode, attr); 1987 if (!error && attr->ia_valid & ATTR_MODE) 1988 error = posix_acl_chmod(&init_user_ns, inode, 1989 inode->i_mode); 1990 } 1991 1992 error: 1993 if (!error) 1994 mark_inode_dirty(inode); 1995 gfs2_glock_dq_uninit(&i_gh); 1996 out: 1997 gfs2_qa_put(ip); 1998 return error; 1999 } 2000 2001 /** 2002 * gfs2_getattr - Read out an inode's attributes 2003 * @mnt_userns: user namespace of the mount the inode was found from 2004 * @path: Object to query 2005 * @stat: The inode's stats 2006 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2007 * @flags: AT_STATX_xxx setting 2008 * 2009 * This may be called from the VFS directly, or from within GFS2 with the 2010 * inode locked, so we look to see if the glock is already locked and only 2011 * lock the glock if its not already been done. Note that its the NFS 2012 * readdirplus operation which causes this to be called (from filldir) 2013 * with the glock already held. 2014 * 2015 * Returns: errno 2016 */ 2017 2018 static int gfs2_getattr(struct user_namespace *mnt_userns, 2019 const struct path *path, struct kstat *stat, 2020 u32 request_mask, unsigned int flags) 2021 { 2022 struct inode *inode = d_inode(path->dentry); 2023 struct gfs2_inode *ip = GFS2_I(inode); 2024 struct gfs2_holder gh; 2025 u32 gfsflags; 2026 int error; 2027 2028 gfs2_holder_mark_uninitialized(&gh); 2029 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2030 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2031 if (error) 2032 return error; 2033 } 2034 2035 gfsflags = ip->i_diskflags; 2036 if (gfsflags & GFS2_DIF_APPENDONLY) 2037 stat->attributes |= STATX_ATTR_APPEND; 2038 if (gfsflags & GFS2_DIF_IMMUTABLE) 2039 stat->attributes |= STATX_ATTR_IMMUTABLE; 2040 2041 stat->attributes_mask |= (STATX_ATTR_APPEND | 2042 STATX_ATTR_COMPRESSED | 2043 STATX_ATTR_ENCRYPTED | 2044 STATX_ATTR_IMMUTABLE | 2045 STATX_ATTR_NODUMP); 2046 2047 generic_fillattr(&init_user_ns, inode, stat); 2048 2049 if (gfs2_holder_initialized(&gh)) 2050 gfs2_glock_dq_uninit(&gh); 2051 2052 return 0; 2053 } 2054 2055 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2056 u64 start, u64 len) 2057 { 2058 struct gfs2_inode *ip = GFS2_I(inode); 2059 struct gfs2_holder gh; 2060 int ret; 2061 2062 inode_lock_shared(inode); 2063 2064 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2065 if (ret) 2066 goto out; 2067 2068 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2069 2070 gfs2_glock_dq_uninit(&gh); 2071 2072 out: 2073 inode_unlock_shared(inode); 2074 return ret; 2075 } 2076 2077 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2078 { 2079 struct inode *inode = file->f_mapping->host; 2080 struct gfs2_inode *ip = GFS2_I(inode); 2081 struct gfs2_holder gh; 2082 loff_t ret; 2083 2084 inode_lock_shared(inode); 2085 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2086 if (!ret) 2087 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2088 gfs2_glock_dq_uninit(&gh); 2089 inode_unlock_shared(inode); 2090 2091 if (ret < 0) 2092 return ret; 2093 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2094 } 2095 2096 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2097 { 2098 struct inode *inode = file->f_mapping->host; 2099 struct gfs2_inode *ip = GFS2_I(inode); 2100 struct gfs2_holder gh; 2101 loff_t ret; 2102 2103 inode_lock_shared(inode); 2104 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2105 if (!ret) 2106 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2107 gfs2_glock_dq_uninit(&gh); 2108 inode_unlock_shared(inode); 2109 2110 if (ret < 0) 2111 return ret; 2112 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2113 } 2114 2115 static int gfs2_update_time(struct inode *inode, struct timespec64 *time, 2116 int flags) 2117 { 2118 struct gfs2_inode *ip = GFS2_I(inode); 2119 struct gfs2_glock *gl = ip->i_gl; 2120 struct gfs2_holder *gh; 2121 int error; 2122 2123 gh = gfs2_glock_is_locked_by_me(gl); 2124 if (gh && !gfs2_glock_is_held_excl(gl)) { 2125 gfs2_glock_dq(gh); 2126 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2127 error = gfs2_glock_nq(gh); 2128 if (error) 2129 return error; 2130 } 2131 return generic_update_time(inode, time, flags); 2132 } 2133 2134 static const struct inode_operations gfs2_file_iops = { 2135 .permission = gfs2_permission, 2136 .setattr = gfs2_setattr, 2137 .getattr = gfs2_getattr, 2138 .listxattr = gfs2_listxattr, 2139 .fiemap = gfs2_fiemap, 2140 .get_acl = gfs2_get_acl, 2141 .set_acl = gfs2_set_acl, 2142 .update_time = gfs2_update_time, 2143 .fileattr_get = gfs2_fileattr_get, 2144 .fileattr_set = gfs2_fileattr_set, 2145 }; 2146 2147 static const struct inode_operations gfs2_dir_iops = { 2148 .create = gfs2_create, 2149 .lookup = gfs2_lookup, 2150 .link = gfs2_link, 2151 .unlink = gfs2_unlink, 2152 .symlink = gfs2_symlink, 2153 .mkdir = gfs2_mkdir, 2154 .rmdir = gfs2_unlink, 2155 .mknod = gfs2_mknod, 2156 .rename = gfs2_rename2, 2157 .permission = gfs2_permission, 2158 .setattr = gfs2_setattr, 2159 .getattr = gfs2_getattr, 2160 .listxattr = gfs2_listxattr, 2161 .fiemap = gfs2_fiemap, 2162 .get_acl = gfs2_get_acl, 2163 .set_acl = gfs2_set_acl, 2164 .update_time = gfs2_update_time, 2165 .atomic_open = gfs2_atomic_open, 2166 .fileattr_get = gfs2_fileattr_get, 2167 .fileattr_set = gfs2_fileattr_set, 2168 }; 2169 2170 static const struct inode_operations gfs2_symlink_iops = { 2171 .get_link = gfs2_get_link, 2172 .permission = gfs2_permission, 2173 .setattr = gfs2_setattr, 2174 .getattr = gfs2_getattr, 2175 .listxattr = gfs2_listxattr, 2176 .fiemap = gfs2_fiemap, 2177 }; 2178 2179