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 int extra_flags = 0; 134 135 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, 136 &ip->i_gl); 137 if (unlikely(error)) 138 goto fail; 139 140 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, 141 &io_gl); 142 if (unlikely(error)) 143 goto fail; 144 145 if (blktype == GFS2_BLKST_UNLINKED) 146 extra_flags |= LM_FLAG_TRY; 147 else 148 gfs2_cancel_delete_work(io_gl); 149 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, 150 GL_EXACT | GL_NOPID | extra_flags, 151 &ip->i_iopen_gh); 152 gfs2_glock_put(io_gl); 153 if (unlikely(error)) 154 goto fail; 155 156 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { 157 /* 158 * The GL_SKIP flag indicates to skip reading the inode 159 * block. We read the inode when instantiating it 160 * after possibly checking the block type. 161 */ 162 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 163 GL_SKIP, &i_gh); 164 if (error) 165 goto fail; 166 167 error = -ESTALE; 168 if (no_formal_ino && 169 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) 170 goto fail; 171 172 if (blktype != GFS2_BLKST_FREE) { 173 error = gfs2_check_blk_type(sdp, no_addr, 174 blktype); 175 if (error) 176 goto fail; 177 } 178 } 179 180 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags); 181 182 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ 183 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); 184 inode->i_atime.tv_nsec = 0; 185 186 glock_set_object(ip->i_gl, ip); 187 188 if (type == DT_UNKNOWN) { 189 /* Inode glock must be locked already */ 190 error = gfs2_instantiate(&i_gh); 191 if (error) { 192 glock_clear_object(ip->i_gl, ip); 193 goto fail; 194 } 195 } else { 196 ip->i_no_formal_ino = no_formal_ino; 197 inode->i_mode = DT2IF(type); 198 } 199 200 if (gfs2_holder_initialized(&i_gh)) 201 gfs2_glock_dq_uninit(&i_gh); 202 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 203 204 gfs2_set_iop(inode); 205 unlock_new_inode(inode); 206 } 207 208 if (no_formal_ino && ip->i_no_formal_ino && 209 no_formal_ino != ip->i_no_formal_ino) { 210 iput(inode); 211 return ERR_PTR(-ESTALE); 212 } 213 214 return inode; 215 216 fail: 217 if (error == GLR_TRYFAILED) 218 error = -EAGAIN; 219 if (gfs2_holder_initialized(&ip->i_iopen_gh)) 220 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 221 if (gfs2_holder_initialized(&i_gh)) 222 gfs2_glock_dq_uninit(&i_gh); 223 iget_failed(inode); 224 return ERR_PTR(error); 225 } 226 227 /** 228 * gfs2_lookup_by_inum - look up an inode by inode number 229 * @sdp: The super block 230 * @no_addr: The inode number 231 * @no_formal_ino: The inode generation number (0 for any) 232 * @blktype: Requested block type (see gfs2_inode_lookup) 233 */ 234 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 235 u64 no_formal_ino, unsigned int blktype) 236 { 237 struct super_block *sb = sdp->sd_vfs; 238 struct inode *inode; 239 int error; 240 241 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 242 blktype); 243 if (IS_ERR(inode)) 244 return inode; 245 246 if (no_formal_ino) { 247 error = -EIO; 248 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 249 goto fail_iput; 250 } 251 return inode; 252 253 fail_iput: 254 iput(inode); 255 return ERR_PTR(error); 256 } 257 258 259 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 260 { 261 struct qstr qstr; 262 struct inode *inode; 263 gfs2_str2qstr(&qstr, name); 264 inode = gfs2_lookupi(dip, &qstr, 1); 265 /* gfs2_lookupi has inconsistent callers: vfs 266 * related routines expect NULL for no entry found, 267 * gfs2_lookup_simple callers expect ENOENT 268 * and do not check for NULL. 269 */ 270 if (inode == NULL) 271 return ERR_PTR(-ENOENT); 272 else 273 return inode; 274 } 275 276 277 /** 278 * gfs2_lookupi - Look up a filename in a directory and return its inode 279 * @dir: The inode of the directory containing the inode to look-up 280 * @name: The name of the inode to look for 281 * @is_root: If 1, ignore the caller's permissions 282 * 283 * This can be called via the VFS filldir function when NFS is doing 284 * a readdirplus and the inode which its intending to stat isn't 285 * already in cache. In this case we must not take the directory glock 286 * again, since the readdir call will have already taken that lock. 287 * 288 * Returns: errno 289 */ 290 291 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 292 int is_root) 293 { 294 struct super_block *sb = dir->i_sb; 295 struct gfs2_inode *dip = GFS2_I(dir); 296 struct gfs2_holder d_gh; 297 int error = 0; 298 struct inode *inode = NULL; 299 300 gfs2_holder_mark_uninitialized(&d_gh); 301 if (!name->len || name->len > GFS2_FNAMESIZE) 302 return ERR_PTR(-ENAMETOOLONG); 303 304 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 305 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 306 dir == d_inode(sb->s_root))) { 307 igrab(dir); 308 return dir; 309 } 310 311 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 312 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 313 if (error) 314 return ERR_PTR(error); 315 } 316 317 if (!is_root) { 318 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC); 319 if (error) 320 goto out; 321 } 322 323 inode = gfs2_dir_search(dir, name, false); 324 if (IS_ERR(inode)) 325 error = PTR_ERR(inode); 326 out: 327 if (gfs2_holder_initialized(&d_gh)) 328 gfs2_glock_dq_uninit(&d_gh); 329 if (error == -ENOENT) 330 return NULL; 331 return inode ? inode : ERR_PTR(error); 332 } 333 334 /** 335 * create_ok - OK to create a new on-disk inode here? 336 * @dip: Directory in which dinode is to be created 337 * @name: Name of new dinode 338 * @mode: 339 * 340 * Returns: errno 341 */ 342 343 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 344 umode_t mode) 345 { 346 int error; 347 348 error = gfs2_permission(&init_user_ns, &dip->i_inode, 349 MAY_WRITE | MAY_EXEC); 350 if (error) 351 return error; 352 353 /* Don't create entries in an unlinked directory */ 354 if (!dip->i_inode.i_nlink) 355 return -ENOENT; 356 357 if (dip->i_entries == (u32)-1) 358 return -EFBIG; 359 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 360 return -EMLINK; 361 362 return 0; 363 } 364 365 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 366 struct inode *inode) 367 { 368 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 369 (dip->i_inode.i_mode & S_ISUID) && 370 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 371 if (S_ISDIR(inode->i_mode)) 372 inode->i_mode |= S_ISUID; 373 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 374 inode->i_mode &= ~07111; 375 inode->i_uid = dip->i_inode.i_uid; 376 } else 377 inode->i_uid = current_fsuid(); 378 379 if (dip->i_inode.i_mode & S_ISGID) { 380 if (S_ISDIR(inode->i_mode)) 381 inode->i_mode |= S_ISGID; 382 inode->i_gid = dip->i_inode.i_gid; 383 } else 384 inode->i_gid = current_fsgid(); 385 } 386 387 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 388 { 389 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 390 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 391 int error; 392 393 error = gfs2_quota_lock_check(ip, &ap); 394 if (error) 395 goto out; 396 397 error = gfs2_inplace_reserve(ip, &ap); 398 if (error) 399 goto out_quota; 400 401 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 402 if (error) 403 goto out_ipreserv; 404 405 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); 406 ip->i_no_formal_ino = ip->i_generation; 407 ip->i_inode.i_ino = ip->i_no_addr; 408 ip->i_goal = ip->i_no_addr; 409 410 gfs2_trans_end(sdp); 411 412 out_ipreserv: 413 gfs2_inplace_release(ip); 414 out_quota: 415 gfs2_quota_unlock(ip); 416 out: 417 return error; 418 } 419 420 static void gfs2_init_dir(struct buffer_head *dibh, 421 const struct gfs2_inode *parent) 422 { 423 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 424 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 425 426 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 427 dent->de_inum = di->di_num; /* already GFS2 endian */ 428 dent->de_type = cpu_to_be16(DT_DIR); 429 430 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 431 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 432 gfs2_inum_out(parent, dent); 433 dent->de_type = cpu_to_be16(DT_DIR); 434 435 } 436 437 /** 438 * gfs2_init_xattr - Initialise an xattr block for a new inode 439 * @ip: The inode in question 440 * 441 * This sets up an empty xattr block for a new inode, ready to 442 * take any ACLs, LSM xattrs, etc. 443 */ 444 445 static void gfs2_init_xattr(struct gfs2_inode *ip) 446 { 447 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 448 struct buffer_head *bh; 449 struct gfs2_ea_header *ea; 450 451 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 452 gfs2_trans_add_meta(ip->i_gl, bh); 453 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 454 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 455 456 ea = GFS2_EA_BH2FIRST(bh); 457 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 458 ea->ea_type = GFS2_EATYPE_UNUSED; 459 ea->ea_flags = GFS2_EAFLAG_LAST; 460 461 brelse(bh); 462 } 463 464 /** 465 * init_dinode - Fill in a new dinode structure 466 * @dip: The directory this inode is being created in 467 * @ip: The inode 468 * @symname: The symlink destination (if a symlink) 469 * 470 */ 471 472 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 473 const char *symname) 474 { 475 struct gfs2_dinode *di; 476 struct buffer_head *dibh; 477 478 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 479 gfs2_trans_add_meta(ip->i_gl, dibh); 480 di = (struct gfs2_dinode *)dibh->b_data; 481 gfs2_dinode_out(ip, di); 482 483 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 484 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 485 di->__pad1 = 0; 486 di->__pad2 = 0; 487 di->__pad3 = 0; 488 memset(&di->__pad4, 0, sizeof(di->__pad4)); 489 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 490 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 491 492 switch(ip->i_inode.i_mode & S_IFMT) { 493 case S_IFDIR: 494 gfs2_init_dir(dibh, dip); 495 break; 496 case S_IFLNK: 497 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 498 break; 499 } 500 501 set_buffer_uptodate(dibh); 502 brelse(dibh); 503 } 504 505 /** 506 * gfs2_trans_da_blks - Calculate number of blocks to link inode 507 * @dip: The directory we are linking into 508 * @da: The dir add information 509 * @nr_inodes: The number of inodes involved 510 * 511 * This calculate the number of blocks we need to reserve in a 512 * transaction to link @nr_inodes into a directory. In most cases 513 * @nr_inodes will be 2 (the directory plus the inode being linked in) 514 * but in case of rename, 4 may be required. 515 * 516 * Returns: Number of blocks 517 */ 518 519 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 520 const struct gfs2_diradd *da, 521 unsigned nr_inodes) 522 { 523 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 524 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 525 } 526 527 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 528 struct gfs2_inode *ip, struct gfs2_diradd *da) 529 { 530 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 531 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 532 int error; 533 534 if (da->nr_blocks) { 535 error = gfs2_quota_lock_check(dip, &ap); 536 if (error) 537 goto fail_quota_locks; 538 539 error = gfs2_inplace_reserve(dip, &ap); 540 if (error) 541 goto fail_quota_locks; 542 543 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 544 if (error) 545 goto fail_ipreserv; 546 } else { 547 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 548 if (error) 549 goto fail_quota_locks; 550 } 551 552 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 553 554 gfs2_trans_end(sdp); 555 fail_ipreserv: 556 gfs2_inplace_release(dip); 557 fail_quota_locks: 558 gfs2_quota_unlock(dip); 559 return error; 560 } 561 562 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 563 void *fs_info) 564 { 565 const struct xattr *xattr; 566 int err = 0; 567 568 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 569 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 570 xattr->value_len, 0, 571 GFS2_EATYPE_SECURITY); 572 if (err < 0) 573 break; 574 } 575 return err; 576 } 577 578 /** 579 * gfs2_create_inode - Create a new inode 580 * @dir: The parent directory 581 * @dentry: The new dentry 582 * @file: If non-NULL, the file which is being opened 583 * @mode: The permissions on the new inode 584 * @dev: For device nodes, this is the device number 585 * @symname: For symlinks, this is the link destination 586 * @size: The initial size of the inode (ignored for directories) 587 * @excl: Force fail if inode exists 588 * 589 * Returns: 0 on success, or error code 590 */ 591 592 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 593 struct file *file, 594 umode_t mode, dev_t dev, const char *symname, 595 unsigned int size, int excl) 596 { 597 const struct qstr *name = &dentry->d_name; 598 struct posix_acl *default_acl, *acl; 599 struct gfs2_holder ghs[2]; 600 struct inode *inode = NULL; 601 struct gfs2_inode *dip = GFS2_I(dir), *ip; 602 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 603 struct gfs2_glock *io_gl; 604 int error, free_vfs_inode = 1; 605 u32 aflags = 0; 606 unsigned blocks = 1; 607 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 608 609 if (!name->len || name->len > GFS2_FNAMESIZE) 610 return -ENAMETOOLONG; 611 612 error = gfs2_qa_get(dip); 613 if (error) 614 return error; 615 616 error = gfs2_rindex_update(sdp); 617 if (error) 618 goto fail; 619 620 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 621 if (error) 622 goto fail; 623 gfs2_holder_mark_uninitialized(ghs + 1); 624 625 error = create_ok(dip, name, mode); 626 if (error) 627 goto fail_gunlock; 628 629 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 630 error = PTR_ERR(inode); 631 if (!IS_ERR(inode)) { 632 if (S_ISDIR(inode->i_mode)) { 633 iput(inode); 634 inode = ERR_PTR(-EISDIR); 635 goto fail_gunlock; 636 } 637 d_instantiate(dentry, inode); 638 error = 0; 639 if (file) { 640 if (S_ISREG(inode->i_mode)) 641 error = finish_open(file, dentry, gfs2_open_common); 642 else 643 error = finish_no_open(file, NULL); 644 } 645 gfs2_glock_dq_uninit(ghs); 646 goto fail; 647 } else if (error != -ENOENT) { 648 goto fail_gunlock; 649 } 650 651 error = gfs2_diradd_alloc_required(dir, name, &da); 652 if (error < 0) 653 goto fail_gunlock; 654 655 inode = new_inode(sdp->sd_vfs); 656 error = -ENOMEM; 657 if (!inode) 658 goto fail_gunlock; 659 660 error = posix_acl_create(dir, &mode, &default_acl, &acl); 661 if (error) 662 goto fail_gunlock; 663 664 ip = GFS2_I(inode); 665 error = gfs2_qa_get(ip); 666 if (error) 667 goto fail_free_acls; 668 669 inode->i_mode = mode; 670 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 671 inode->i_rdev = dev; 672 inode->i_size = size; 673 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 674 munge_mode_uid_gid(dip, inode); 675 check_and_update_goal(dip); 676 ip->i_goal = dip->i_goal; 677 ip->i_diskflags = 0; 678 ip->i_eattr = 0; 679 ip->i_height = 0; 680 ip->i_depth = 0; 681 ip->i_entries = 0; 682 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 683 684 switch(mode & S_IFMT) { 685 case S_IFREG: 686 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 687 gfs2_tune_get(sdp, gt_new_files_jdata)) 688 ip->i_diskflags |= GFS2_DIF_JDATA; 689 gfs2_set_aops(inode); 690 break; 691 case S_IFDIR: 692 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 693 ip->i_diskflags |= GFS2_DIF_JDATA; 694 ip->i_entries = 2; 695 break; 696 } 697 698 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 699 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 700 ip->i_diskflags |= GFS2_DIF_SYSTEM; 701 702 gfs2_set_inode_flags(inode); 703 704 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 705 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 706 aflags |= GFS2_AF_ORLOV; 707 708 if (default_acl || acl) 709 blocks++; 710 711 error = alloc_dinode(ip, aflags, &blocks); 712 if (error) 713 goto fail_free_inode; 714 715 gfs2_set_inode_blocks(inode, blocks); 716 717 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 718 if (error) 719 goto fail_free_inode; 720 721 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 722 if (error) 723 goto fail_free_inode; 724 gfs2_cancel_delete_work(io_gl); 725 726 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); 727 BUG_ON(error); 728 729 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID, 730 &ip->i_iopen_gh); 731 if (error) 732 goto fail_gunlock2; 733 734 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 735 if (error) 736 goto fail_gunlock3; 737 738 error = gfs2_trans_begin(sdp, blocks, 0); 739 if (error) 740 goto fail_gunlock3; 741 742 if (blocks > 1) { 743 ip->i_eattr = ip->i_no_addr + 1; 744 gfs2_init_xattr(ip); 745 } 746 init_dinode(dip, ip, symname); 747 gfs2_trans_end(sdp); 748 749 glock_set_object(ip->i_gl, ip); 750 glock_set_object(io_gl, ip); 751 gfs2_set_iop(inode); 752 753 free_vfs_inode = 0; /* After this point, the inode is no longer 754 considered free. Any failures need to undo 755 the gfs2 structures. */ 756 if (default_acl) { 757 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 758 if (error) 759 goto fail_gunlock4; 760 posix_acl_release(default_acl); 761 default_acl = NULL; 762 } 763 if (acl) { 764 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 765 if (error) 766 goto fail_gunlock4; 767 posix_acl_release(acl); 768 acl = NULL; 769 } 770 771 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 772 &gfs2_initxattrs, NULL); 773 if (error) 774 goto fail_gunlock4; 775 776 error = link_dinode(dip, name, ip, &da); 777 if (error) 778 goto fail_gunlock4; 779 780 mark_inode_dirty(inode); 781 d_instantiate(dentry, inode); 782 /* After instantiate, errors should result in evict which will destroy 783 * both inode and iopen glocks properly. */ 784 if (file) { 785 file->f_mode |= FMODE_CREATED; 786 error = finish_open(file, dentry, gfs2_open_common); 787 } 788 gfs2_glock_dq_uninit(ghs); 789 gfs2_qa_put(ip); 790 gfs2_glock_dq_uninit(ghs + 1); 791 gfs2_glock_put(io_gl); 792 gfs2_qa_put(dip); 793 unlock_new_inode(inode); 794 return error; 795 796 fail_gunlock4: 797 glock_clear_object(ip->i_gl, ip); 798 glock_clear_object(io_gl, ip); 799 fail_gunlock3: 800 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 801 fail_gunlock2: 802 gfs2_glock_put(io_gl); 803 fail_free_inode: 804 if (ip->i_gl) { 805 if (free_vfs_inode) /* else evict will do the put for us */ 806 gfs2_glock_put(ip->i_gl); 807 } 808 gfs2_rs_deltree(&ip->i_res); 809 gfs2_qa_put(ip); 810 fail_free_acls: 811 posix_acl_release(default_acl); 812 posix_acl_release(acl); 813 fail_gunlock: 814 gfs2_dir_no_add(&da); 815 gfs2_glock_dq_uninit(ghs); 816 if (!IS_ERR_OR_NULL(inode)) { 817 clear_nlink(inode); 818 if (!free_vfs_inode) 819 mark_inode_dirty(inode); 820 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 821 &GFS2_I(inode)->i_flags); 822 if (inode->i_state & I_NEW) 823 iget_failed(inode); 824 else 825 iput(inode); 826 } 827 if (gfs2_holder_initialized(ghs + 1)) 828 gfs2_glock_dq_uninit(ghs + 1); 829 fail: 830 gfs2_qa_put(dip); 831 return error; 832 } 833 834 /** 835 * gfs2_create - Create a file 836 * @mnt_userns: User namespace of the mount the inode was found from 837 * @dir: The directory in which to create the file 838 * @dentry: The dentry of the new file 839 * @mode: The mode of the new file 840 * @excl: Force fail if inode exists 841 * 842 * Returns: errno 843 */ 844 845 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir, 846 struct dentry *dentry, umode_t mode, bool excl) 847 { 848 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 849 } 850 851 /** 852 * __gfs2_lookup - Look up a filename in a directory and return its inode 853 * @dir: The directory inode 854 * @dentry: The dentry of the new inode 855 * @file: File to be opened 856 * 857 * 858 * Returns: errno 859 */ 860 861 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 862 struct file *file) 863 { 864 struct inode *inode; 865 struct dentry *d; 866 struct gfs2_holder gh; 867 struct gfs2_glock *gl; 868 int error; 869 870 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 871 if (inode == NULL) { 872 d_add(dentry, NULL); 873 return NULL; 874 } 875 if (IS_ERR(inode)) 876 return ERR_CAST(inode); 877 878 gl = GFS2_I(inode)->i_gl; 879 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 880 if (error) { 881 iput(inode); 882 return ERR_PTR(error); 883 } 884 885 d = d_splice_alias(inode, dentry); 886 if (IS_ERR(d)) { 887 gfs2_glock_dq_uninit(&gh); 888 return d; 889 } 890 if (file && S_ISREG(inode->i_mode)) 891 error = finish_open(file, dentry, gfs2_open_common); 892 893 gfs2_glock_dq_uninit(&gh); 894 if (error) { 895 dput(d); 896 return ERR_PTR(error); 897 } 898 return d; 899 } 900 901 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 902 unsigned flags) 903 { 904 return __gfs2_lookup(dir, dentry, NULL); 905 } 906 907 /** 908 * gfs2_link - Link to a file 909 * @old_dentry: The inode to link 910 * @dir: Add link to this directory 911 * @dentry: The name of the link 912 * 913 * Link the inode in "old_dentry" into the directory "dir" with the 914 * name in "dentry". 915 * 916 * Returns: errno 917 */ 918 919 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 920 struct dentry *dentry) 921 { 922 struct gfs2_inode *dip = GFS2_I(dir); 923 struct gfs2_sbd *sdp = GFS2_SB(dir); 924 struct inode *inode = d_inode(old_dentry); 925 struct gfs2_inode *ip = GFS2_I(inode); 926 struct gfs2_holder ghs[2]; 927 struct buffer_head *dibh; 928 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 929 int error; 930 931 if (S_ISDIR(inode->i_mode)) 932 return -EPERM; 933 934 error = gfs2_qa_get(dip); 935 if (error) 936 return error; 937 938 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 939 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 940 941 error = gfs2_glock_nq(ghs); /* parent */ 942 if (error) 943 goto out_parent; 944 945 error = gfs2_glock_nq(ghs + 1); /* child */ 946 if (error) 947 goto out_child; 948 949 error = -ENOENT; 950 if (inode->i_nlink == 0) 951 goto out_gunlock; 952 953 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 954 if (error) 955 goto out_gunlock; 956 957 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 958 switch (error) { 959 case -ENOENT: 960 break; 961 case 0: 962 error = -EEXIST; 963 goto out_gunlock; 964 default: 965 goto out_gunlock; 966 } 967 968 error = -EINVAL; 969 if (!dip->i_inode.i_nlink) 970 goto out_gunlock; 971 error = -EFBIG; 972 if (dip->i_entries == (u32)-1) 973 goto out_gunlock; 974 error = -EPERM; 975 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 976 goto out_gunlock; 977 error = -EINVAL; 978 if (!ip->i_inode.i_nlink) 979 goto out_gunlock; 980 error = -EMLINK; 981 if (ip->i_inode.i_nlink == (u32)-1) 982 goto out_gunlock; 983 984 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 985 if (error < 0) 986 goto out_gunlock; 987 988 if (da.nr_blocks) { 989 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 990 error = gfs2_quota_lock_check(dip, &ap); 991 if (error) 992 goto out_gunlock; 993 994 error = gfs2_inplace_reserve(dip, &ap); 995 if (error) 996 goto out_gunlock_q; 997 998 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 999 if (error) 1000 goto out_ipres; 1001 } else { 1002 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1003 if (error) 1004 goto out_ipres; 1005 } 1006 1007 error = gfs2_meta_inode_buffer(ip, &dibh); 1008 if (error) 1009 goto out_end_trans; 1010 1011 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1012 if (error) 1013 goto out_brelse; 1014 1015 gfs2_trans_add_meta(ip->i_gl, dibh); 1016 inc_nlink(&ip->i_inode); 1017 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1018 ihold(inode); 1019 d_instantiate(dentry, inode); 1020 mark_inode_dirty(inode); 1021 1022 out_brelse: 1023 brelse(dibh); 1024 out_end_trans: 1025 gfs2_trans_end(sdp); 1026 out_ipres: 1027 if (da.nr_blocks) 1028 gfs2_inplace_release(dip); 1029 out_gunlock_q: 1030 if (da.nr_blocks) 1031 gfs2_quota_unlock(dip); 1032 out_gunlock: 1033 gfs2_dir_no_add(&da); 1034 gfs2_glock_dq(ghs + 1); 1035 out_child: 1036 gfs2_glock_dq(ghs); 1037 out_parent: 1038 gfs2_qa_put(dip); 1039 gfs2_holder_uninit(ghs); 1040 gfs2_holder_uninit(ghs + 1); 1041 return error; 1042 } 1043 1044 /* 1045 * gfs2_unlink_ok - check to see that a inode is still in a directory 1046 * @dip: the directory 1047 * @name: the name of the file 1048 * @ip: the inode 1049 * 1050 * Assumes that the lock on (at least) @dip is held. 1051 * 1052 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1053 */ 1054 1055 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1056 const struct gfs2_inode *ip) 1057 { 1058 int error; 1059 1060 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1061 return -EPERM; 1062 1063 if ((dip->i_inode.i_mode & S_ISVTX) && 1064 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1065 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1066 return -EPERM; 1067 1068 if (IS_APPEND(&dip->i_inode)) 1069 return -EPERM; 1070 1071 error = gfs2_permission(&init_user_ns, &dip->i_inode, 1072 MAY_WRITE | MAY_EXEC); 1073 if (error) 1074 return error; 1075 1076 return gfs2_dir_check(&dip->i_inode, name, ip); 1077 } 1078 1079 /** 1080 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1081 * @dip: The parent directory 1082 * @dentry: The dentry to unlink 1083 * 1084 * Called with all the locks and in a transaction. This will only be 1085 * called for a directory after it has been checked to ensure it is empty. 1086 * 1087 * Returns: 0 on success, or an error 1088 */ 1089 1090 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1091 const struct dentry *dentry) 1092 { 1093 struct inode *inode = d_inode(dentry); 1094 struct gfs2_inode *ip = GFS2_I(inode); 1095 int error; 1096 1097 error = gfs2_dir_del(dip, dentry); 1098 if (error) 1099 return error; 1100 1101 ip->i_entries = 0; 1102 inode->i_ctime = current_time(inode); 1103 if (S_ISDIR(inode->i_mode)) 1104 clear_nlink(inode); 1105 else 1106 drop_nlink(inode); 1107 mark_inode_dirty(inode); 1108 if (inode->i_nlink == 0) 1109 gfs2_unlink_di(inode); 1110 return 0; 1111 } 1112 1113 1114 /** 1115 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1116 * @dir: The inode of the directory containing the inode to unlink 1117 * @dentry: The file itself 1118 * 1119 * This routine uses the type of the inode as a flag to figure out 1120 * whether this is an unlink or an rmdir. 1121 * 1122 * Returns: errno 1123 */ 1124 1125 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1126 { 1127 struct gfs2_inode *dip = GFS2_I(dir); 1128 struct gfs2_sbd *sdp = GFS2_SB(dir); 1129 struct inode *inode = d_inode(dentry); 1130 struct gfs2_inode *ip = GFS2_I(inode); 1131 struct gfs2_holder ghs[3]; 1132 struct gfs2_rgrpd *rgd; 1133 int error; 1134 1135 error = gfs2_rindex_update(sdp); 1136 if (error) 1137 return error; 1138 1139 error = -EROFS; 1140 1141 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1142 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1143 1144 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1145 if (!rgd) 1146 goto out_inodes; 1147 1148 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2); 1149 1150 1151 error = gfs2_glock_nq(ghs); /* parent */ 1152 if (error) 1153 goto out_parent; 1154 1155 error = gfs2_glock_nq(ghs + 1); /* child */ 1156 if (error) 1157 goto out_child; 1158 1159 error = -ENOENT; 1160 if (inode->i_nlink == 0) 1161 goto out_rgrp; 1162 1163 if (S_ISDIR(inode->i_mode)) { 1164 error = -ENOTEMPTY; 1165 if (ip->i_entries > 2 || inode->i_nlink > 2) 1166 goto out_rgrp; 1167 } 1168 1169 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1170 if (error) 1171 goto out_rgrp; 1172 1173 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1174 if (error) 1175 goto out_gunlock; 1176 1177 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1178 if (error) 1179 goto out_gunlock; 1180 1181 error = gfs2_unlink_inode(dip, dentry); 1182 gfs2_trans_end(sdp); 1183 1184 out_gunlock: 1185 gfs2_glock_dq(ghs + 2); 1186 out_rgrp: 1187 gfs2_glock_dq(ghs + 1); 1188 out_child: 1189 gfs2_glock_dq(ghs); 1190 out_parent: 1191 gfs2_holder_uninit(ghs + 2); 1192 out_inodes: 1193 gfs2_holder_uninit(ghs + 1); 1194 gfs2_holder_uninit(ghs); 1195 return error; 1196 } 1197 1198 /** 1199 * gfs2_symlink - Create a symlink 1200 * @mnt_userns: User namespace of the mount the inode was found from 1201 * @dir: The directory to create the symlink in 1202 * @dentry: The dentry to put the symlink in 1203 * @symname: The thing which the link points to 1204 * 1205 * Returns: errno 1206 */ 1207 1208 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1209 struct dentry *dentry, const char *symname) 1210 { 1211 unsigned int size; 1212 1213 size = strlen(symname); 1214 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1215 return -ENAMETOOLONG; 1216 1217 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1218 } 1219 1220 /** 1221 * gfs2_mkdir - Make a directory 1222 * @mnt_userns: User namespace of the mount the inode was found from 1223 * @dir: The parent directory of the new one 1224 * @dentry: The dentry of the new directory 1225 * @mode: The mode of the new directory 1226 * 1227 * Returns: errno 1228 */ 1229 1230 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 1231 struct dentry *dentry, umode_t mode) 1232 { 1233 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1234 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1235 } 1236 1237 /** 1238 * gfs2_mknod - Make a special file 1239 * @mnt_userns: User namespace of the mount the inode was found from 1240 * @dir: The directory in which the special file will reside 1241 * @dentry: The dentry of the special file 1242 * @mode: The mode of the special file 1243 * @dev: The device specification of the special file 1244 * 1245 */ 1246 1247 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1248 struct dentry *dentry, umode_t mode, dev_t dev) 1249 { 1250 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1251 } 1252 1253 /** 1254 * gfs2_atomic_open - Atomically open a file 1255 * @dir: The directory 1256 * @dentry: The proposed new entry 1257 * @file: The proposed new struct file 1258 * @flags: open flags 1259 * @mode: File mode 1260 * 1261 * Returns: error code or 0 for success 1262 */ 1263 1264 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1265 struct file *file, unsigned flags, 1266 umode_t mode) 1267 { 1268 struct dentry *d; 1269 bool excl = !!(flags & O_EXCL); 1270 1271 if (!d_in_lookup(dentry)) 1272 goto skip_lookup; 1273 1274 d = __gfs2_lookup(dir, dentry, file); 1275 if (IS_ERR(d)) 1276 return PTR_ERR(d); 1277 if (d != NULL) 1278 dentry = d; 1279 if (d_really_is_positive(dentry)) { 1280 if (!(file->f_mode & FMODE_OPENED)) 1281 return finish_no_open(file, d); 1282 dput(d); 1283 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1284 } 1285 1286 BUG_ON(d != NULL); 1287 1288 skip_lookup: 1289 if (!(flags & O_CREAT)) 1290 return -ENOENT; 1291 1292 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1293 } 1294 1295 /* 1296 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1297 * @this: move this 1298 * @to: to here 1299 * 1300 * Follow @to back to the root and make sure we don't encounter @this 1301 * Assumes we already hold the rename lock. 1302 * 1303 * Returns: errno 1304 */ 1305 1306 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1307 { 1308 struct inode *dir = &to->i_inode; 1309 struct super_block *sb = dir->i_sb; 1310 struct inode *tmp; 1311 int error = 0; 1312 1313 igrab(dir); 1314 1315 for (;;) { 1316 if (dir == &this->i_inode) { 1317 error = -EINVAL; 1318 break; 1319 } 1320 if (dir == d_inode(sb->s_root)) { 1321 error = 0; 1322 break; 1323 } 1324 1325 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1326 if (!tmp) { 1327 error = -ENOENT; 1328 break; 1329 } 1330 if (IS_ERR(tmp)) { 1331 error = PTR_ERR(tmp); 1332 break; 1333 } 1334 1335 iput(dir); 1336 dir = tmp; 1337 } 1338 1339 iput(dir); 1340 1341 return error; 1342 } 1343 1344 /** 1345 * update_moved_ino - Update an inode that's being moved 1346 * @ip: The inode being moved 1347 * @ndip: The parent directory of the new filename 1348 * @dir_rename: True of ip is a directory 1349 * 1350 * Returns: errno 1351 */ 1352 1353 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1354 int dir_rename) 1355 { 1356 if (dir_rename) 1357 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1358 1359 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1360 mark_inode_dirty_sync(&ip->i_inode); 1361 return 0; 1362 } 1363 1364 1365 /** 1366 * gfs2_rename - Rename a file 1367 * @odir: Parent directory of old file name 1368 * @odentry: The old dentry of the file 1369 * @ndir: Parent directory of new file name 1370 * @ndentry: The new dentry of the file 1371 * 1372 * Returns: errno 1373 */ 1374 1375 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1376 struct inode *ndir, struct dentry *ndentry) 1377 { 1378 struct gfs2_inode *odip = GFS2_I(odir); 1379 struct gfs2_inode *ndip = GFS2_I(ndir); 1380 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1381 struct gfs2_inode *nip = NULL; 1382 struct gfs2_sbd *sdp = GFS2_SB(odir); 1383 struct gfs2_holder ghs[4], r_gh, rd_gh; 1384 struct gfs2_rgrpd *nrgd; 1385 unsigned int num_gh; 1386 int dir_rename = 0; 1387 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1388 unsigned int x; 1389 int error; 1390 1391 gfs2_holder_mark_uninitialized(&r_gh); 1392 gfs2_holder_mark_uninitialized(&rd_gh); 1393 if (d_really_is_positive(ndentry)) { 1394 nip = GFS2_I(d_inode(ndentry)); 1395 if (ip == nip) 1396 return 0; 1397 } 1398 1399 error = gfs2_rindex_update(sdp); 1400 if (error) 1401 return error; 1402 1403 error = gfs2_qa_get(ndip); 1404 if (error) 1405 return error; 1406 1407 if (odip != ndip) { 1408 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1409 0, &r_gh); 1410 if (error) 1411 goto out; 1412 1413 if (S_ISDIR(ip->i_inode.i_mode)) { 1414 dir_rename = 1; 1415 /* don't move a directory into its subdir */ 1416 error = gfs2_ok_to_move(ip, ndip); 1417 if (error) 1418 goto out_gunlock_r; 1419 } 1420 } 1421 1422 num_gh = 1; 1423 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1424 if (odip != ndip) { 1425 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1426 ghs + num_gh); 1427 num_gh++; 1428 } 1429 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1430 num_gh++; 1431 1432 if (nip) { 1433 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1434 ghs + num_gh); 1435 num_gh++; 1436 } 1437 1438 for (x = 0; x < num_gh; x++) { 1439 error = gfs2_glock_nq(ghs + x); 1440 if (error) 1441 goto out_gunlock; 1442 } 1443 error = gfs2_glock_async_wait(num_gh, ghs); 1444 if (error) 1445 goto out_gunlock; 1446 1447 if (nip) { 1448 /* Grab the resource group glock for unlink flag twiddling. 1449 * This is the case where the target dinode already exists 1450 * so we unlink before doing the rename. 1451 */ 1452 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1453 if (!nrgd) { 1454 error = -ENOENT; 1455 goto out_gunlock; 1456 } 1457 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1458 LM_FLAG_NODE_SCOPE, &rd_gh); 1459 if (error) 1460 goto out_gunlock; 1461 } 1462 1463 error = -ENOENT; 1464 if (ip->i_inode.i_nlink == 0) 1465 goto out_gunlock; 1466 1467 /* Check out the old directory */ 1468 1469 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1470 if (error) 1471 goto out_gunlock; 1472 1473 /* Check out the new directory */ 1474 1475 if (nip) { 1476 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1477 if (error) 1478 goto out_gunlock; 1479 1480 if (nip->i_inode.i_nlink == 0) { 1481 error = -EAGAIN; 1482 goto out_gunlock; 1483 } 1484 1485 if (S_ISDIR(nip->i_inode.i_mode)) { 1486 if (nip->i_entries < 2) { 1487 gfs2_consist_inode(nip); 1488 error = -EIO; 1489 goto out_gunlock; 1490 } 1491 if (nip->i_entries > 2) { 1492 error = -ENOTEMPTY; 1493 goto out_gunlock; 1494 } 1495 } 1496 } else { 1497 error = gfs2_permission(&init_user_ns, ndir, 1498 MAY_WRITE | MAY_EXEC); 1499 if (error) 1500 goto out_gunlock; 1501 1502 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1503 switch (error) { 1504 case -ENOENT: 1505 error = 0; 1506 break; 1507 case 0: 1508 error = -EEXIST; 1509 goto out_gunlock; 1510 default: 1511 goto out_gunlock; 1512 } 1513 1514 if (odip != ndip) { 1515 if (!ndip->i_inode.i_nlink) { 1516 error = -ENOENT; 1517 goto out_gunlock; 1518 } 1519 if (ndip->i_entries == (u32)-1) { 1520 error = -EFBIG; 1521 goto out_gunlock; 1522 } 1523 if (S_ISDIR(ip->i_inode.i_mode) && 1524 ndip->i_inode.i_nlink == (u32)-1) { 1525 error = -EMLINK; 1526 goto out_gunlock; 1527 } 1528 } 1529 } 1530 1531 /* Check out the dir to be renamed */ 1532 1533 if (dir_rename) { 1534 error = gfs2_permission(&init_user_ns, d_inode(odentry), 1535 MAY_WRITE); 1536 if (error) 1537 goto out_gunlock; 1538 } 1539 1540 if (nip == NULL) { 1541 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1542 if (error) 1543 goto out_gunlock; 1544 } 1545 1546 if (da.nr_blocks) { 1547 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1548 error = gfs2_quota_lock_check(ndip, &ap); 1549 if (error) 1550 goto out_gunlock; 1551 1552 error = gfs2_inplace_reserve(ndip, &ap); 1553 if (error) 1554 goto out_gunlock_q; 1555 1556 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1557 4 * RES_LEAF + 4, 0); 1558 if (error) 1559 goto out_ipreserv; 1560 } else { 1561 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1562 5 * RES_LEAF + 4, 0); 1563 if (error) 1564 goto out_gunlock; 1565 } 1566 1567 /* Remove the target file, if it exists */ 1568 1569 if (nip) 1570 error = gfs2_unlink_inode(ndip, ndentry); 1571 1572 error = update_moved_ino(ip, ndip, dir_rename); 1573 if (error) 1574 goto out_end_trans; 1575 1576 error = gfs2_dir_del(odip, odentry); 1577 if (error) 1578 goto out_end_trans; 1579 1580 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1581 if (error) 1582 goto out_end_trans; 1583 1584 out_end_trans: 1585 gfs2_trans_end(sdp); 1586 out_ipreserv: 1587 if (da.nr_blocks) 1588 gfs2_inplace_release(ndip); 1589 out_gunlock_q: 1590 if (da.nr_blocks) 1591 gfs2_quota_unlock(ndip); 1592 out_gunlock: 1593 gfs2_dir_no_add(&da); 1594 if (gfs2_holder_initialized(&rd_gh)) 1595 gfs2_glock_dq_uninit(&rd_gh); 1596 1597 while (x--) { 1598 if (gfs2_holder_queued(ghs + x)) 1599 gfs2_glock_dq(ghs + x); 1600 gfs2_holder_uninit(ghs + x); 1601 } 1602 out_gunlock_r: 1603 if (gfs2_holder_initialized(&r_gh)) 1604 gfs2_glock_dq_uninit(&r_gh); 1605 out: 1606 gfs2_qa_put(ndip); 1607 return error; 1608 } 1609 1610 /** 1611 * gfs2_exchange - exchange two files 1612 * @odir: Parent directory of old file name 1613 * @odentry: The old dentry of the file 1614 * @ndir: Parent directory of new file name 1615 * @ndentry: The new dentry of the file 1616 * @flags: The rename flags 1617 * 1618 * Returns: errno 1619 */ 1620 1621 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1622 struct inode *ndir, struct dentry *ndentry, 1623 unsigned int flags) 1624 { 1625 struct gfs2_inode *odip = GFS2_I(odir); 1626 struct gfs2_inode *ndip = GFS2_I(ndir); 1627 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1628 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1629 struct gfs2_sbd *sdp = GFS2_SB(odir); 1630 struct gfs2_holder ghs[4], r_gh; 1631 unsigned int num_gh; 1632 unsigned int x; 1633 umode_t old_mode = oip->i_inode.i_mode; 1634 umode_t new_mode = nip->i_inode.i_mode; 1635 int error; 1636 1637 gfs2_holder_mark_uninitialized(&r_gh); 1638 error = gfs2_rindex_update(sdp); 1639 if (error) 1640 return error; 1641 1642 if (odip != ndip) { 1643 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1644 0, &r_gh); 1645 if (error) 1646 goto out; 1647 1648 if (S_ISDIR(old_mode)) { 1649 /* don't move a directory into its subdir */ 1650 error = gfs2_ok_to_move(oip, ndip); 1651 if (error) 1652 goto out_gunlock_r; 1653 } 1654 1655 if (S_ISDIR(new_mode)) { 1656 /* don't move a directory into its subdir */ 1657 error = gfs2_ok_to_move(nip, odip); 1658 if (error) 1659 goto out_gunlock_r; 1660 } 1661 } 1662 1663 num_gh = 1; 1664 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1665 if (odip != ndip) { 1666 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1667 ghs + num_gh); 1668 num_gh++; 1669 } 1670 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1671 num_gh++; 1672 1673 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1674 num_gh++; 1675 1676 for (x = 0; x < num_gh; x++) { 1677 error = gfs2_glock_nq(ghs + x); 1678 if (error) 1679 goto out_gunlock; 1680 } 1681 1682 error = gfs2_glock_async_wait(num_gh, ghs); 1683 if (error) 1684 goto out_gunlock; 1685 1686 error = -ENOENT; 1687 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1688 goto out_gunlock; 1689 1690 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1691 if (error) 1692 goto out_gunlock; 1693 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1694 if (error) 1695 goto out_gunlock; 1696 1697 if (S_ISDIR(old_mode)) { 1698 error = gfs2_permission(&init_user_ns, odentry->d_inode, 1699 MAY_WRITE); 1700 if (error) 1701 goto out_gunlock; 1702 } 1703 if (S_ISDIR(new_mode)) { 1704 error = gfs2_permission(&init_user_ns, ndentry->d_inode, 1705 MAY_WRITE); 1706 if (error) 1707 goto out_gunlock; 1708 } 1709 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1710 if (error) 1711 goto out_gunlock; 1712 1713 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1714 if (error) 1715 goto out_end_trans; 1716 1717 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1718 if (error) 1719 goto out_end_trans; 1720 1721 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1722 IF2DT(old_mode)); 1723 if (error) 1724 goto out_end_trans; 1725 1726 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1727 IF2DT(new_mode)); 1728 if (error) 1729 goto out_end_trans; 1730 1731 if (odip != ndip) { 1732 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1733 inc_nlink(&odip->i_inode); 1734 drop_nlink(&ndip->i_inode); 1735 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1736 inc_nlink(&ndip->i_inode); 1737 drop_nlink(&odip->i_inode); 1738 } 1739 } 1740 mark_inode_dirty(&ndip->i_inode); 1741 if (odip != ndip) 1742 mark_inode_dirty(&odip->i_inode); 1743 1744 out_end_trans: 1745 gfs2_trans_end(sdp); 1746 out_gunlock: 1747 while (x--) { 1748 if (gfs2_holder_queued(ghs + x)) 1749 gfs2_glock_dq(ghs + x); 1750 gfs2_holder_uninit(ghs + x); 1751 } 1752 out_gunlock_r: 1753 if (gfs2_holder_initialized(&r_gh)) 1754 gfs2_glock_dq_uninit(&r_gh); 1755 out: 1756 return error; 1757 } 1758 1759 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir, 1760 struct dentry *odentry, struct inode *ndir, 1761 struct dentry *ndentry, unsigned int flags) 1762 { 1763 flags &= ~RENAME_NOREPLACE; 1764 1765 if (flags & ~RENAME_EXCHANGE) 1766 return -EINVAL; 1767 1768 if (flags & RENAME_EXCHANGE) 1769 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1770 1771 return gfs2_rename(odir, odentry, ndir, ndentry); 1772 } 1773 1774 /** 1775 * gfs2_get_link - Follow a symbolic link 1776 * @dentry: The dentry of the link 1777 * @inode: The inode of the link 1778 * @done: destructor for return value 1779 * 1780 * This can handle symlinks of any size. 1781 * 1782 * Returns: 0 on success or error code 1783 */ 1784 1785 static const char *gfs2_get_link(struct dentry *dentry, 1786 struct inode *inode, 1787 struct delayed_call *done) 1788 { 1789 struct gfs2_inode *ip = GFS2_I(inode); 1790 struct gfs2_holder i_gh; 1791 struct buffer_head *dibh; 1792 unsigned int size; 1793 char *buf; 1794 int error; 1795 1796 if (!dentry) 1797 return ERR_PTR(-ECHILD); 1798 1799 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1800 error = gfs2_glock_nq(&i_gh); 1801 if (error) { 1802 gfs2_holder_uninit(&i_gh); 1803 return ERR_PTR(error); 1804 } 1805 1806 size = (unsigned int)i_size_read(&ip->i_inode); 1807 if (size == 0) { 1808 gfs2_consist_inode(ip); 1809 buf = ERR_PTR(-EIO); 1810 goto out; 1811 } 1812 1813 error = gfs2_meta_inode_buffer(ip, &dibh); 1814 if (error) { 1815 buf = ERR_PTR(error); 1816 goto out; 1817 } 1818 1819 buf = kzalloc(size + 1, GFP_NOFS); 1820 if (!buf) 1821 buf = ERR_PTR(-ENOMEM); 1822 else 1823 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1824 brelse(dibh); 1825 out: 1826 gfs2_glock_dq_uninit(&i_gh); 1827 if (!IS_ERR(buf)) 1828 set_delayed_call(done, kfree_link, buf); 1829 return buf; 1830 } 1831 1832 /** 1833 * gfs2_permission 1834 * @mnt_userns: User namespace of the mount the inode was found from 1835 * @inode: The inode 1836 * @mask: The mask to be tested 1837 * 1838 * This may be called from the VFS directly, or from within GFS2 with the 1839 * inode locked, so we look to see if the glock is already locked and only 1840 * lock the glock if its not already been done. 1841 * 1842 * Returns: errno 1843 */ 1844 1845 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode, 1846 int mask) 1847 { 1848 struct gfs2_inode *ip; 1849 struct gfs2_holder i_gh; 1850 int error; 1851 1852 gfs2_holder_mark_uninitialized(&i_gh); 1853 ip = GFS2_I(inode); 1854 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1855 if (mask & MAY_NOT_BLOCK) 1856 return -ECHILD; 1857 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1858 if (error) 1859 return error; 1860 } 1861 1862 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1863 error = -EPERM; 1864 else 1865 error = generic_permission(&init_user_ns, inode, mask); 1866 if (gfs2_holder_initialized(&i_gh)) 1867 gfs2_glock_dq_uninit(&i_gh); 1868 1869 return error; 1870 } 1871 1872 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1873 { 1874 setattr_copy(&init_user_ns, inode, attr); 1875 mark_inode_dirty(inode); 1876 return 0; 1877 } 1878 1879 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1880 { 1881 int error; 1882 1883 if (current->journal_info) 1884 return __gfs2_setattr_simple(inode, attr); 1885 1886 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1887 if (error) 1888 return error; 1889 1890 error = __gfs2_setattr_simple(inode, attr); 1891 gfs2_trans_end(GFS2_SB(inode)); 1892 return error; 1893 } 1894 1895 static int setattr_chown(struct inode *inode, struct iattr *attr) 1896 { 1897 struct gfs2_inode *ip = GFS2_I(inode); 1898 struct gfs2_sbd *sdp = GFS2_SB(inode); 1899 kuid_t ouid, nuid; 1900 kgid_t ogid, ngid; 1901 int error; 1902 struct gfs2_alloc_parms ap; 1903 1904 ouid = inode->i_uid; 1905 ogid = inode->i_gid; 1906 nuid = attr->ia_uid; 1907 ngid = attr->ia_gid; 1908 1909 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1910 ouid = nuid = NO_UID_QUOTA_CHANGE; 1911 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1912 ogid = ngid = NO_GID_QUOTA_CHANGE; 1913 error = gfs2_qa_get(ip); 1914 if (error) 1915 return error; 1916 1917 error = gfs2_rindex_update(sdp); 1918 if (error) 1919 goto out; 1920 1921 error = gfs2_quota_lock(ip, nuid, ngid); 1922 if (error) 1923 goto out; 1924 1925 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1926 1927 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1928 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1929 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1930 if (error) 1931 goto out_gunlock_q; 1932 } 1933 1934 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1935 if (error) 1936 goto out_gunlock_q; 1937 1938 error = gfs2_setattr_simple(inode, attr); 1939 if (error) 1940 goto out_end_trans; 1941 1942 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1943 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1944 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1945 gfs2_quota_change(ip, ap.target, nuid, ngid); 1946 } 1947 1948 out_end_trans: 1949 gfs2_trans_end(sdp); 1950 out_gunlock_q: 1951 gfs2_quota_unlock(ip); 1952 out: 1953 gfs2_qa_put(ip); 1954 return error; 1955 } 1956 1957 /** 1958 * gfs2_setattr - Change attributes on an inode 1959 * @mnt_userns: User namespace of the mount the inode was found from 1960 * @dentry: The dentry which is changing 1961 * @attr: The structure describing the change 1962 * 1963 * The VFS layer wants to change one or more of an inodes attributes. Write 1964 * that change out to disk. 1965 * 1966 * Returns: errno 1967 */ 1968 1969 static int gfs2_setattr(struct user_namespace *mnt_userns, 1970 struct dentry *dentry, struct iattr *attr) 1971 { 1972 struct inode *inode = d_inode(dentry); 1973 struct gfs2_inode *ip = GFS2_I(inode); 1974 struct gfs2_holder i_gh; 1975 int error; 1976 1977 error = gfs2_qa_get(ip); 1978 if (error) 1979 return error; 1980 1981 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1982 if (error) 1983 goto out; 1984 1985 error = may_setattr(&init_user_ns, inode, attr->ia_valid); 1986 if (error) 1987 goto error; 1988 1989 error = setattr_prepare(&init_user_ns, dentry, attr); 1990 if (error) 1991 goto error; 1992 1993 if (attr->ia_valid & ATTR_SIZE) 1994 error = gfs2_setattr_size(inode, attr->ia_size); 1995 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1996 error = setattr_chown(inode, attr); 1997 else { 1998 error = gfs2_setattr_simple(inode, attr); 1999 if (!error && attr->ia_valid & ATTR_MODE) 2000 error = posix_acl_chmod(&init_user_ns, inode, 2001 inode->i_mode); 2002 } 2003 2004 error: 2005 if (!error) 2006 mark_inode_dirty(inode); 2007 gfs2_glock_dq_uninit(&i_gh); 2008 out: 2009 gfs2_qa_put(ip); 2010 return error; 2011 } 2012 2013 /** 2014 * gfs2_getattr - Read out an inode's attributes 2015 * @mnt_userns: user namespace of the mount the inode was found from 2016 * @path: Object to query 2017 * @stat: The inode's stats 2018 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2019 * @flags: AT_STATX_xxx setting 2020 * 2021 * This may be called from the VFS directly, or from within GFS2 with the 2022 * inode locked, so we look to see if the glock is already locked and only 2023 * lock the glock if its not already been done. Note that its the NFS 2024 * readdirplus operation which causes this to be called (from filldir) 2025 * with the glock already held. 2026 * 2027 * Returns: errno 2028 */ 2029 2030 static int gfs2_getattr(struct user_namespace *mnt_userns, 2031 const struct path *path, struct kstat *stat, 2032 u32 request_mask, unsigned int flags) 2033 { 2034 struct inode *inode = d_inode(path->dentry); 2035 struct gfs2_inode *ip = GFS2_I(inode); 2036 struct gfs2_holder gh; 2037 u32 gfsflags; 2038 int error; 2039 2040 gfs2_holder_mark_uninitialized(&gh); 2041 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2042 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2043 if (error) 2044 return error; 2045 } 2046 2047 gfsflags = ip->i_diskflags; 2048 if (gfsflags & GFS2_DIF_APPENDONLY) 2049 stat->attributes |= STATX_ATTR_APPEND; 2050 if (gfsflags & GFS2_DIF_IMMUTABLE) 2051 stat->attributes |= STATX_ATTR_IMMUTABLE; 2052 2053 stat->attributes_mask |= (STATX_ATTR_APPEND | 2054 STATX_ATTR_COMPRESSED | 2055 STATX_ATTR_ENCRYPTED | 2056 STATX_ATTR_IMMUTABLE | 2057 STATX_ATTR_NODUMP); 2058 2059 generic_fillattr(&init_user_ns, inode, stat); 2060 2061 if (gfs2_holder_initialized(&gh)) 2062 gfs2_glock_dq_uninit(&gh); 2063 2064 return 0; 2065 } 2066 2067 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2068 u64 start, u64 len) 2069 { 2070 struct gfs2_inode *ip = GFS2_I(inode); 2071 struct gfs2_holder gh; 2072 int ret; 2073 2074 inode_lock_shared(inode); 2075 2076 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2077 if (ret) 2078 goto out; 2079 2080 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2081 2082 gfs2_glock_dq_uninit(&gh); 2083 2084 out: 2085 inode_unlock_shared(inode); 2086 return ret; 2087 } 2088 2089 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2090 { 2091 struct inode *inode = file->f_mapping->host; 2092 struct gfs2_inode *ip = GFS2_I(inode); 2093 struct gfs2_holder gh; 2094 loff_t ret; 2095 2096 inode_lock_shared(inode); 2097 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2098 if (!ret) 2099 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2100 gfs2_glock_dq_uninit(&gh); 2101 inode_unlock_shared(inode); 2102 2103 if (ret < 0) 2104 return ret; 2105 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2106 } 2107 2108 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2109 { 2110 struct inode *inode = file->f_mapping->host; 2111 struct gfs2_inode *ip = GFS2_I(inode); 2112 struct gfs2_holder gh; 2113 loff_t ret; 2114 2115 inode_lock_shared(inode); 2116 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2117 if (!ret) 2118 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2119 gfs2_glock_dq_uninit(&gh); 2120 inode_unlock_shared(inode); 2121 2122 if (ret < 0) 2123 return ret; 2124 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2125 } 2126 2127 static int gfs2_update_time(struct inode *inode, struct timespec64 *time, 2128 int flags) 2129 { 2130 struct gfs2_inode *ip = GFS2_I(inode); 2131 struct gfs2_glock *gl = ip->i_gl; 2132 struct gfs2_holder *gh; 2133 int error; 2134 2135 gh = gfs2_glock_is_locked_by_me(gl); 2136 if (gh && !gfs2_glock_is_held_excl(gl)) { 2137 gfs2_glock_dq(gh); 2138 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2139 error = gfs2_glock_nq(gh); 2140 if (error) 2141 return error; 2142 } 2143 return generic_update_time(inode, time, flags); 2144 } 2145 2146 static const struct inode_operations gfs2_file_iops = { 2147 .permission = gfs2_permission, 2148 .setattr = gfs2_setattr, 2149 .getattr = gfs2_getattr, 2150 .listxattr = gfs2_listxattr, 2151 .fiemap = gfs2_fiemap, 2152 .get_acl = gfs2_get_acl, 2153 .set_acl = gfs2_set_acl, 2154 .update_time = gfs2_update_time, 2155 .fileattr_get = gfs2_fileattr_get, 2156 .fileattr_set = gfs2_fileattr_set, 2157 }; 2158 2159 static const struct inode_operations gfs2_dir_iops = { 2160 .create = gfs2_create, 2161 .lookup = gfs2_lookup, 2162 .link = gfs2_link, 2163 .unlink = gfs2_unlink, 2164 .symlink = gfs2_symlink, 2165 .mkdir = gfs2_mkdir, 2166 .rmdir = gfs2_unlink, 2167 .mknod = gfs2_mknod, 2168 .rename = gfs2_rename2, 2169 .permission = gfs2_permission, 2170 .setattr = gfs2_setattr, 2171 .getattr = gfs2_getattr, 2172 .listxattr = gfs2_listxattr, 2173 .fiemap = gfs2_fiemap, 2174 .get_acl = gfs2_get_acl, 2175 .set_acl = gfs2_set_acl, 2176 .update_time = gfs2_update_time, 2177 .atomic_open = gfs2_atomic_open, 2178 .fileattr_get = gfs2_fileattr_get, 2179 .fileattr_set = gfs2_fileattr_set, 2180 }; 2181 2182 static const struct inode_operations gfs2_symlink_iops = { 2183 .get_link = gfs2_get_link, 2184 .permission = gfs2_permission, 2185 .setattr = gfs2_setattr, 2186 .getattr = gfs2_getattr, 2187 .listxattr = gfs2_listxattr, 2188 .fiemap = gfs2_fiemap, 2189 }; 2190 2191