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 /* 146 * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is 147 * delete_work_func(). Make sure not to cancel the delete work 148 * from within itself here. 149 */ 150 if (blktype == GFS2_BLKST_UNLINKED) 151 extra_flags |= LM_FLAG_TRY; 152 else 153 gfs2_cancel_delete_work(io_gl); 154 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, 155 GL_EXACT | GL_NOPID | extra_flags, 156 &ip->i_iopen_gh); 157 gfs2_glock_put(io_gl); 158 if (unlikely(error)) 159 goto fail; 160 161 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { 162 /* 163 * The GL_SKIP flag indicates to skip reading the inode 164 * block. We read the inode when instantiating it 165 * after possibly checking the block type. 166 */ 167 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 168 GL_SKIP, &i_gh); 169 if (error) 170 goto fail; 171 172 error = -ESTALE; 173 if (no_formal_ino && 174 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) 175 goto fail; 176 177 if (blktype != GFS2_BLKST_FREE) { 178 error = gfs2_check_blk_type(sdp, no_addr, 179 blktype); 180 if (error) 181 goto fail; 182 } 183 } 184 185 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags); 186 187 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ 188 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); 189 inode->i_atime.tv_nsec = 0; 190 191 glock_set_object(ip->i_gl, ip); 192 193 if (type == DT_UNKNOWN) { 194 /* Inode glock must be locked already */ 195 error = gfs2_instantiate(&i_gh); 196 if (error) { 197 glock_clear_object(ip->i_gl, ip); 198 goto fail; 199 } 200 } else { 201 ip->i_no_formal_ino = no_formal_ino; 202 inode->i_mode = DT2IF(type); 203 } 204 205 if (gfs2_holder_initialized(&i_gh)) 206 gfs2_glock_dq_uninit(&i_gh); 207 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 208 209 gfs2_set_iop(inode); 210 unlock_new_inode(inode); 211 } 212 213 if (no_formal_ino && ip->i_no_formal_ino && 214 no_formal_ino != ip->i_no_formal_ino) { 215 iput(inode); 216 return ERR_PTR(-ESTALE); 217 } 218 219 return inode; 220 221 fail: 222 if (error == GLR_TRYFAILED) 223 error = -EAGAIN; 224 if (gfs2_holder_initialized(&ip->i_iopen_gh)) 225 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 226 if (gfs2_holder_initialized(&i_gh)) 227 gfs2_glock_dq_uninit(&i_gh); 228 if (ip->i_gl) { 229 gfs2_glock_put(ip->i_gl); 230 ip->i_gl = NULL; 231 } 232 iget_failed(inode); 233 return ERR_PTR(error); 234 } 235 236 /** 237 * gfs2_lookup_by_inum - look up an inode by inode number 238 * @sdp: The super block 239 * @no_addr: The inode number 240 * @no_formal_ino: The inode generation number (0 for any) 241 * @blktype: Requested block type (see gfs2_inode_lookup) 242 */ 243 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 244 u64 no_formal_ino, unsigned int blktype) 245 { 246 struct super_block *sb = sdp->sd_vfs; 247 struct inode *inode; 248 int error; 249 250 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 251 blktype); 252 if (IS_ERR(inode)) 253 return inode; 254 255 if (no_formal_ino) { 256 error = -EIO; 257 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 258 goto fail_iput; 259 } 260 return inode; 261 262 fail_iput: 263 iput(inode); 264 return ERR_PTR(error); 265 } 266 267 268 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 269 { 270 struct qstr qstr; 271 struct inode *inode; 272 gfs2_str2qstr(&qstr, name); 273 inode = gfs2_lookupi(dip, &qstr, 1); 274 /* gfs2_lookupi has inconsistent callers: vfs 275 * related routines expect NULL for no entry found, 276 * gfs2_lookup_simple callers expect ENOENT 277 * and do not check for NULL. 278 */ 279 if (inode == NULL) 280 return ERR_PTR(-ENOENT); 281 else 282 return inode; 283 } 284 285 286 /** 287 * gfs2_lookupi - Look up a filename in a directory and return its inode 288 * @dir: The inode of the directory containing the inode to look-up 289 * @name: The name of the inode to look for 290 * @is_root: If 1, ignore the caller's permissions 291 * 292 * This can be called via the VFS filldir function when NFS is doing 293 * a readdirplus and the inode which its intending to stat isn't 294 * already in cache. In this case we must not take the directory glock 295 * again, since the readdir call will have already taken that lock. 296 * 297 * Returns: errno 298 */ 299 300 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 301 int is_root) 302 { 303 struct super_block *sb = dir->i_sb; 304 struct gfs2_inode *dip = GFS2_I(dir); 305 struct gfs2_holder d_gh; 306 int error = 0; 307 struct inode *inode = NULL; 308 309 gfs2_holder_mark_uninitialized(&d_gh); 310 if (!name->len || name->len > GFS2_FNAMESIZE) 311 return ERR_PTR(-ENAMETOOLONG); 312 313 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 314 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 315 dir == d_inode(sb->s_root))) { 316 igrab(dir); 317 return dir; 318 } 319 320 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 321 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 322 if (error) 323 return ERR_PTR(error); 324 } 325 326 if (!is_root) { 327 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC); 328 if (error) 329 goto out; 330 } 331 332 inode = gfs2_dir_search(dir, name, false); 333 if (IS_ERR(inode)) 334 error = PTR_ERR(inode); 335 out: 336 if (gfs2_holder_initialized(&d_gh)) 337 gfs2_glock_dq_uninit(&d_gh); 338 if (error == -ENOENT) 339 return NULL; 340 return inode ? inode : ERR_PTR(error); 341 } 342 343 /** 344 * create_ok - OK to create a new on-disk inode here? 345 * @dip: Directory in which dinode is to be created 346 * @name: Name of new dinode 347 * @mode: 348 * 349 * Returns: errno 350 */ 351 352 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 353 umode_t mode) 354 { 355 int error; 356 357 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 358 MAY_WRITE | MAY_EXEC); 359 if (error) 360 return error; 361 362 /* Don't create entries in an unlinked directory */ 363 if (!dip->i_inode.i_nlink) 364 return -ENOENT; 365 366 if (dip->i_entries == (u32)-1) 367 return -EFBIG; 368 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 369 return -EMLINK; 370 371 return 0; 372 } 373 374 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 375 struct inode *inode) 376 { 377 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 378 (dip->i_inode.i_mode & S_ISUID) && 379 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 380 if (S_ISDIR(inode->i_mode)) 381 inode->i_mode |= S_ISUID; 382 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 383 inode->i_mode &= ~07111; 384 inode->i_uid = dip->i_inode.i_uid; 385 } else 386 inode->i_uid = current_fsuid(); 387 388 if (dip->i_inode.i_mode & S_ISGID) { 389 if (S_ISDIR(inode->i_mode)) 390 inode->i_mode |= S_ISGID; 391 inode->i_gid = dip->i_inode.i_gid; 392 } else 393 inode->i_gid = current_fsgid(); 394 } 395 396 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 397 { 398 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 399 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 400 int error; 401 402 error = gfs2_quota_lock_check(ip, &ap); 403 if (error) 404 goto out; 405 406 error = gfs2_inplace_reserve(ip, &ap); 407 if (error) 408 goto out_quota; 409 410 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 411 if (error) 412 goto out_ipreserv; 413 414 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); 415 if (error) 416 goto out_trans_end; 417 418 ip->i_no_formal_ino = ip->i_generation; 419 ip->i_inode.i_ino = ip->i_no_addr; 420 ip->i_goal = ip->i_no_addr; 421 if (*dblocks > 1) 422 ip->i_eattr = ip->i_no_addr + 1; 423 424 out_trans_end: 425 gfs2_trans_end(sdp); 426 out_ipreserv: 427 gfs2_inplace_release(ip); 428 out_quota: 429 gfs2_quota_unlock(ip); 430 out: 431 return error; 432 } 433 434 static void gfs2_init_dir(struct buffer_head *dibh, 435 const struct gfs2_inode *parent) 436 { 437 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 438 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 439 440 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 441 dent->de_inum = di->di_num; /* already GFS2 endian */ 442 dent->de_type = cpu_to_be16(DT_DIR); 443 444 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 445 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 446 gfs2_inum_out(parent, dent); 447 dent->de_type = cpu_to_be16(DT_DIR); 448 449 } 450 451 /** 452 * gfs2_init_xattr - Initialise an xattr block for a new inode 453 * @ip: The inode in question 454 * 455 * This sets up an empty xattr block for a new inode, ready to 456 * take any ACLs, LSM xattrs, etc. 457 */ 458 459 static void gfs2_init_xattr(struct gfs2_inode *ip) 460 { 461 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 462 struct buffer_head *bh; 463 struct gfs2_ea_header *ea; 464 465 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 466 gfs2_trans_add_meta(ip->i_gl, bh); 467 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 468 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 469 470 ea = GFS2_EA_BH2FIRST(bh); 471 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 472 ea->ea_type = GFS2_EATYPE_UNUSED; 473 ea->ea_flags = GFS2_EAFLAG_LAST; 474 475 brelse(bh); 476 } 477 478 /** 479 * init_dinode - Fill in a new dinode structure 480 * @dip: The directory this inode is being created in 481 * @ip: The inode 482 * @symname: The symlink destination (if a symlink) 483 * 484 */ 485 486 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 487 const char *symname) 488 { 489 struct gfs2_dinode *di; 490 struct buffer_head *dibh; 491 492 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 493 gfs2_trans_add_meta(ip->i_gl, dibh); 494 di = (struct gfs2_dinode *)dibh->b_data; 495 gfs2_dinode_out(ip, di); 496 497 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 498 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 499 di->__pad1 = 0; 500 di->__pad2 = 0; 501 di->__pad3 = 0; 502 memset(&di->__pad4, 0, sizeof(di->__pad4)); 503 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 504 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 505 506 switch(ip->i_inode.i_mode & S_IFMT) { 507 case S_IFDIR: 508 gfs2_init_dir(dibh, dip); 509 break; 510 case S_IFLNK: 511 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 512 break; 513 } 514 515 set_buffer_uptodate(dibh); 516 brelse(dibh); 517 } 518 519 /** 520 * gfs2_trans_da_blks - Calculate number of blocks to link inode 521 * @dip: The directory we are linking into 522 * @da: The dir add information 523 * @nr_inodes: The number of inodes involved 524 * 525 * This calculate the number of blocks we need to reserve in a 526 * transaction to link @nr_inodes into a directory. In most cases 527 * @nr_inodes will be 2 (the directory plus the inode being linked in) 528 * but in case of rename, 4 may be required. 529 * 530 * Returns: Number of blocks 531 */ 532 533 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 534 const struct gfs2_diradd *da, 535 unsigned nr_inodes) 536 { 537 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 538 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 539 } 540 541 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 542 struct gfs2_inode *ip, struct gfs2_diradd *da) 543 { 544 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 545 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 546 int error; 547 548 if (da->nr_blocks) { 549 error = gfs2_quota_lock_check(dip, &ap); 550 if (error) 551 goto fail_quota_locks; 552 553 error = gfs2_inplace_reserve(dip, &ap); 554 if (error) 555 goto fail_quota_locks; 556 557 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 558 if (error) 559 goto fail_ipreserv; 560 } else { 561 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 562 if (error) 563 goto fail_quota_locks; 564 } 565 566 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 567 568 gfs2_trans_end(sdp); 569 fail_ipreserv: 570 gfs2_inplace_release(dip); 571 fail_quota_locks: 572 gfs2_quota_unlock(dip); 573 return error; 574 } 575 576 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 577 void *fs_info) 578 { 579 const struct xattr *xattr; 580 int err = 0; 581 582 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 583 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 584 xattr->value_len, 0, 585 GFS2_EATYPE_SECURITY); 586 if (err < 0) 587 break; 588 } 589 return err; 590 } 591 592 /** 593 * gfs2_create_inode - Create a new inode 594 * @dir: The parent directory 595 * @dentry: The new dentry 596 * @file: If non-NULL, the file which is being opened 597 * @mode: The permissions on the new inode 598 * @dev: For device nodes, this is the device number 599 * @symname: For symlinks, this is the link destination 600 * @size: The initial size of the inode (ignored for directories) 601 * @excl: Force fail if inode exists 602 * 603 * FIXME: Change to allocate the disk blocks and write them out in the same 604 * transaction. That way, we can no longer end up in a situation in which an 605 * inode is allocated, the node crashes, and the block looks like a valid 606 * inode. (With atomic creates in place, we will also no longer need to zero 607 * the link count and dirty the inode here on failure.) 608 * 609 * Returns: 0 on success, or error code 610 */ 611 612 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 613 struct file *file, 614 umode_t mode, dev_t dev, const char *symname, 615 unsigned int size, int excl) 616 { 617 const struct qstr *name = &dentry->d_name; 618 struct posix_acl *default_acl, *acl; 619 struct gfs2_holder d_gh, gh; 620 struct inode *inode = NULL; 621 struct gfs2_inode *dip = GFS2_I(dir), *ip; 622 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 623 struct gfs2_glock *io_gl; 624 int error; 625 u32 aflags = 0; 626 unsigned blocks = 1; 627 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 628 629 if (!name->len || name->len > GFS2_FNAMESIZE) 630 return -ENAMETOOLONG; 631 632 error = gfs2_qa_get(dip); 633 if (error) 634 return error; 635 636 error = gfs2_rindex_update(sdp); 637 if (error) 638 goto fail; 639 640 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 641 if (error) 642 goto fail; 643 gfs2_holder_mark_uninitialized(&gh); 644 645 error = create_ok(dip, name, mode); 646 if (error) 647 goto fail_gunlock; 648 649 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 650 error = PTR_ERR(inode); 651 if (!IS_ERR(inode)) { 652 if (S_ISDIR(inode->i_mode)) { 653 iput(inode); 654 inode = ERR_PTR(-EISDIR); 655 goto fail_gunlock; 656 } 657 d_instantiate(dentry, inode); 658 error = 0; 659 if (file) { 660 if (S_ISREG(inode->i_mode)) 661 error = finish_open(file, dentry, gfs2_open_common); 662 else 663 error = finish_no_open(file, NULL); 664 } 665 gfs2_glock_dq_uninit(&d_gh); 666 goto fail; 667 } else if (error != -ENOENT) { 668 goto fail_gunlock; 669 } 670 671 error = gfs2_diradd_alloc_required(dir, name, &da); 672 if (error < 0) 673 goto fail_gunlock; 674 675 inode = new_inode(sdp->sd_vfs); 676 error = -ENOMEM; 677 if (!inode) 678 goto fail_gunlock; 679 ip = GFS2_I(inode); 680 681 error = posix_acl_create(dir, &mode, &default_acl, &acl); 682 if (error) 683 goto fail_gunlock; 684 685 error = gfs2_qa_get(ip); 686 if (error) 687 goto fail_free_acls; 688 689 inode->i_mode = mode; 690 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 691 inode->i_rdev = dev; 692 inode->i_size = size; 693 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 694 munge_mode_uid_gid(dip, inode); 695 check_and_update_goal(dip); 696 ip->i_goal = dip->i_goal; 697 ip->i_diskflags = 0; 698 ip->i_eattr = 0; 699 ip->i_height = 0; 700 ip->i_depth = 0; 701 ip->i_entries = 0; 702 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 703 704 switch(mode & S_IFMT) { 705 case S_IFREG: 706 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 707 gfs2_tune_get(sdp, gt_new_files_jdata)) 708 ip->i_diskflags |= GFS2_DIF_JDATA; 709 gfs2_set_aops(inode); 710 break; 711 case S_IFDIR: 712 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 713 ip->i_diskflags |= GFS2_DIF_JDATA; 714 ip->i_entries = 2; 715 break; 716 } 717 718 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 719 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 720 ip->i_diskflags |= GFS2_DIF_SYSTEM; 721 722 gfs2_set_inode_flags(inode); 723 724 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 725 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 726 aflags |= GFS2_AF_ORLOV; 727 728 if (default_acl || acl) 729 blocks++; 730 731 error = alloc_dinode(ip, aflags, &blocks); 732 if (error) 733 goto fail_free_inode; 734 735 gfs2_set_inode_blocks(inode, blocks); 736 737 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 738 if (error) 739 goto fail_free_inode; 740 741 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 742 if (error) 743 goto fail_free_inode; 744 gfs2_cancel_delete_work(io_gl); 745 746 retry: 747 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); 748 if (error == -EBUSY) 749 goto retry; 750 if (error) 751 goto fail_gunlock2; 752 753 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID, 754 &ip->i_iopen_gh); 755 if (error) 756 goto fail_gunlock2; 757 758 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 759 if (error) 760 goto fail_gunlock3; 761 762 error = gfs2_trans_begin(sdp, blocks, 0); 763 if (error) 764 goto fail_gunlock3; 765 766 if (blocks > 1) 767 gfs2_init_xattr(ip); 768 init_dinode(dip, ip, symname); 769 gfs2_trans_end(sdp); 770 771 glock_set_object(ip->i_gl, ip); 772 glock_set_object(io_gl, ip); 773 gfs2_set_iop(inode); 774 775 if (default_acl) { 776 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 777 if (error) 778 goto fail_gunlock4; 779 posix_acl_release(default_acl); 780 default_acl = NULL; 781 } 782 if (acl) { 783 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 784 if (error) 785 goto fail_gunlock4; 786 posix_acl_release(acl); 787 acl = NULL; 788 } 789 790 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 791 &gfs2_initxattrs, NULL); 792 if (error) 793 goto fail_gunlock4; 794 795 error = link_dinode(dip, name, ip, &da); 796 if (error) 797 goto fail_gunlock4; 798 799 mark_inode_dirty(inode); 800 d_instantiate(dentry, inode); 801 /* After instantiate, errors should result in evict which will destroy 802 * both inode and iopen glocks properly. */ 803 if (file) { 804 file->f_mode |= FMODE_CREATED; 805 error = finish_open(file, dentry, gfs2_open_common); 806 } 807 gfs2_glock_dq_uninit(&d_gh); 808 gfs2_qa_put(ip); 809 gfs2_glock_dq_uninit(&gh); 810 gfs2_glock_put(io_gl); 811 gfs2_qa_put(dip); 812 unlock_new_inode(inode); 813 return error; 814 815 fail_gunlock4: 816 glock_clear_object(ip->i_gl, ip); 817 glock_clear_object(io_gl, ip); 818 fail_gunlock3: 819 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 820 fail_gunlock2: 821 gfs2_glock_put(io_gl); 822 fail_free_inode: 823 if (ip->i_gl) { 824 gfs2_glock_put(ip->i_gl); 825 ip->i_gl = NULL; 826 } 827 gfs2_rs_deltree(&ip->i_res); 828 gfs2_qa_put(ip); 829 fail_free_acls: 830 posix_acl_release(default_acl); 831 posix_acl_release(acl); 832 fail_gunlock: 833 gfs2_dir_no_add(&da); 834 gfs2_glock_dq_uninit(&d_gh); 835 if (!IS_ERR_OR_NULL(inode)) { 836 set_bit(GIF_ALLOC_FAILED, &ip->i_flags); 837 clear_nlink(inode); 838 if (ip->i_no_addr) 839 mark_inode_dirty(inode); 840 if (inode->i_state & I_NEW) 841 iget_failed(inode); 842 else 843 iput(inode); 844 } 845 if (gfs2_holder_initialized(&gh)) 846 gfs2_glock_dq_uninit(&gh); 847 fail: 848 gfs2_qa_put(dip); 849 return error; 850 } 851 852 /** 853 * gfs2_create - Create a file 854 * @idmap: idmap of the mount the inode was found from 855 * @dir: The directory in which to create the file 856 * @dentry: The dentry of the new file 857 * @mode: The mode of the new file 858 * @excl: Force fail if inode exists 859 * 860 * Returns: errno 861 */ 862 863 static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir, 864 struct dentry *dentry, umode_t mode, bool excl) 865 { 866 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 867 } 868 869 /** 870 * __gfs2_lookup - Look up a filename in a directory and return its inode 871 * @dir: The directory inode 872 * @dentry: The dentry of the new inode 873 * @file: File to be opened 874 * 875 * 876 * Returns: errno 877 */ 878 879 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 880 struct file *file) 881 { 882 struct inode *inode; 883 struct dentry *d; 884 struct gfs2_holder gh; 885 struct gfs2_glock *gl; 886 int error; 887 888 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 889 if (inode == NULL) { 890 d_add(dentry, NULL); 891 return NULL; 892 } 893 if (IS_ERR(inode)) 894 return ERR_CAST(inode); 895 896 gl = GFS2_I(inode)->i_gl; 897 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 898 if (error) { 899 iput(inode); 900 return ERR_PTR(error); 901 } 902 903 d = d_splice_alias(inode, dentry); 904 if (IS_ERR(d)) { 905 gfs2_glock_dq_uninit(&gh); 906 return d; 907 } 908 if (file && S_ISREG(inode->i_mode)) 909 error = finish_open(file, dentry, gfs2_open_common); 910 911 gfs2_glock_dq_uninit(&gh); 912 if (error) { 913 dput(d); 914 return ERR_PTR(error); 915 } 916 return d; 917 } 918 919 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 920 unsigned flags) 921 { 922 return __gfs2_lookup(dir, dentry, NULL); 923 } 924 925 /** 926 * gfs2_link - Link to a file 927 * @old_dentry: The inode to link 928 * @dir: Add link to this directory 929 * @dentry: The name of the link 930 * 931 * Link the inode in "old_dentry" into the directory "dir" with the 932 * name in "dentry". 933 * 934 * Returns: errno 935 */ 936 937 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 938 struct dentry *dentry) 939 { 940 struct gfs2_inode *dip = GFS2_I(dir); 941 struct gfs2_sbd *sdp = GFS2_SB(dir); 942 struct inode *inode = d_inode(old_dentry); 943 struct gfs2_inode *ip = GFS2_I(inode); 944 struct gfs2_holder d_gh, gh; 945 struct buffer_head *dibh; 946 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 947 int error; 948 949 if (S_ISDIR(inode->i_mode)) 950 return -EPERM; 951 952 error = gfs2_qa_get(dip); 953 if (error) 954 return error; 955 956 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 957 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 958 959 error = gfs2_glock_nq(&d_gh); 960 if (error) 961 goto out_parent; 962 963 error = gfs2_glock_nq(&gh); 964 if (error) 965 goto out_child; 966 967 error = -ENOENT; 968 if (inode->i_nlink == 0) 969 goto out_gunlock; 970 971 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC); 972 if (error) 973 goto out_gunlock; 974 975 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 976 switch (error) { 977 case -ENOENT: 978 break; 979 case 0: 980 error = -EEXIST; 981 goto out_gunlock; 982 default: 983 goto out_gunlock; 984 } 985 986 error = -EINVAL; 987 if (!dip->i_inode.i_nlink) 988 goto out_gunlock; 989 error = -EFBIG; 990 if (dip->i_entries == (u32)-1) 991 goto out_gunlock; 992 error = -EPERM; 993 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 994 goto out_gunlock; 995 error = -EMLINK; 996 if (ip->i_inode.i_nlink == (u32)-1) 997 goto out_gunlock; 998 999 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 1000 if (error < 0) 1001 goto out_gunlock; 1002 1003 if (da.nr_blocks) { 1004 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1005 error = gfs2_quota_lock_check(dip, &ap); 1006 if (error) 1007 goto out_gunlock; 1008 1009 error = gfs2_inplace_reserve(dip, &ap); 1010 if (error) 1011 goto out_gunlock_q; 1012 1013 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1014 if (error) 1015 goto out_ipres; 1016 } else { 1017 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1018 if (error) 1019 goto out_ipres; 1020 } 1021 1022 error = gfs2_meta_inode_buffer(ip, &dibh); 1023 if (error) 1024 goto out_end_trans; 1025 1026 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1027 if (error) 1028 goto out_brelse; 1029 1030 gfs2_trans_add_meta(ip->i_gl, dibh); 1031 inc_nlink(&ip->i_inode); 1032 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1033 ihold(inode); 1034 d_instantiate(dentry, inode); 1035 mark_inode_dirty(inode); 1036 1037 out_brelse: 1038 brelse(dibh); 1039 out_end_trans: 1040 gfs2_trans_end(sdp); 1041 out_ipres: 1042 if (da.nr_blocks) 1043 gfs2_inplace_release(dip); 1044 out_gunlock_q: 1045 if (da.nr_blocks) 1046 gfs2_quota_unlock(dip); 1047 out_gunlock: 1048 gfs2_dir_no_add(&da); 1049 gfs2_glock_dq(&gh); 1050 out_child: 1051 gfs2_glock_dq(&d_gh); 1052 out_parent: 1053 gfs2_qa_put(dip); 1054 gfs2_holder_uninit(&d_gh); 1055 gfs2_holder_uninit(&gh); 1056 return error; 1057 } 1058 1059 /* 1060 * gfs2_unlink_ok - check to see that a inode is still in a directory 1061 * @dip: the directory 1062 * @name: the name of the file 1063 * @ip: the inode 1064 * 1065 * Assumes that the lock on (at least) @dip is held. 1066 * 1067 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1068 */ 1069 1070 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1071 const struct gfs2_inode *ip) 1072 { 1073 int error; 1074 1075 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1076 return -EPERM; 1077 1078 if ((dip->i_inode.i_mode & S_ISVTX) && 1079 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1080 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1081 return -EPERM; 1082 1083 if (IS_APPEND(&dip->i_inode)) 1084 return -EPERM; 1085 1086 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 1087 MAY_WRITE | MAY_EXEC); 1088 if (error) 1089 return error; 1090 1091 return gfs2_dir_check(&dip->i_inode, name, ip); 1092 } 1093 1094 /** 1095 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1096 * @dip: The parent directory 1097 * @dentry: The dentry to unlink 1098 * 1099 * Called with all the locks and in a transaction. This will only be 1100 * called for a directory after it has been checked to ensure it is empty. 1101 * 1102 * Returns: 0 on success, or an error 1103 */ 1104 1105 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1106 const struct dentry *dentry) 1107 { 1108 struct inode *inode = d_inode(dentry); 1109 struct gfs2_inode *ip = GFS2_I(inode); 1110 int error; 1111 1112 error = gfs2_dir_del(dip, dentry); 1113 if (error) 1114 return error; 1115 1116 ip->i_entries = 0; 1117 inode->i_ctime = current_time(inode); 1118 if (S_ISDIR(inode->i_mode)) 1119 clear_nlink(inode); 1120 else 1121 drop_nlink(inode); 1122 mark_inode_dirty(inode); 1123 if (inode->i_nlink == 0) 1124 gfs2_unlink_di(inode); 1125 return 0; 1126 } 1127 1128 1129 /** 1130 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1131 * @dir: The inode of the directory containing the inode to unlink 1132 * @dentry: The file itself 1133 * 1134 * This routine uses the type of the inode as a flag to figure out 1135 * whether this is an unlink or an rmdir. 1136 * 1137 * Returns: errno 1138 */ 1139 1140 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1141 { 1142 struct gfs2_inode *dip = GFS2_I(dir); 1143 struct gfs2_sbd *sdp = GFS2_SB(dir); 1144 struct inode *inode = d_inode(dentry); 1145 struct gfs2_inode *ip = GFS2_I(inode); 1146 struct gfs2_holder d_gh, r_gh, gh; 1147 struct gfs2_rgrpd *rgd; 1148 int error; 1149 1150 error = gfs2_rindex_update(sdp); 1151 if (error) 1152 return error; 1153 1154 error = -EROFS; 1155 1156 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1157 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1158 1159 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1160 if (!rgd) 1161 goto out_inodes; 1162 1163 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh); 1164 1165 1166 error = gfs2_glock_nq(&d_gh); 1167 if (error) 1168 goto out_parent; 1169 1170 error = gfs2_glock_nq(&gh); 1171 if (error) 1172 goto out_child; 1173 1174 error = -ENOENT; 1175 if (inode->i_nlink == 0) 1176 goto out_rgrp; 1177 1178 if (S_ISDIR(inode->i_mode)) { 1179 error = -ENOTEMPTY; 1180 if (ip->i_entries > 2 || inode->i_nlink > 2) 1181 goto out_rgrp; 1182 } 1183 1184 error = gfs2_glock_nq(&r_gh); /* rgrp */ 1185 if (error) 1186 goto out_rgrp; 1187 1188 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1189 if (error) 1190 goto out_gunlock; 1191 1192 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1193 if (error) 1194 goto out_gunlock; 1195 1196 error = gfs2_unlink_inode(dip, dentry); 1197 gfs2_trans_end(sdp); 1198 1199 out_gunlock: 1200 gfs2_glock_dq(&r_gh); 1201 out_rgrp: 1202 gfs2_glock_dq(&gh); 1203 out_child: 1204 gfs2_glock_dq(&d_gh); 1205 out_parent: 1206 gfs2_holder_uninit(&r_gh); 1207 out_inodes: 1208 gfs2_holder_uninit(&gh); 1209 gfs2_holder_uninit(&d_gh); 1210 return error; 1211 } 1212 1213 /** 1214 * gfs2_symlink - Create a symlink 1215 * @idmap: idmap of the mount the inode was found from 1216 * @dir: The directory to create the symlink in 1217 * @dentry: The dentry to put the symlink in 1218 * @symname: The thing which the link points to 1219 * 1220 * Returns: errno 1221 */ 1222 1223 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir, 1224 struct dentry *dentry, const char *symname) 1225 { 1226 unsigned int size; 1227 1228 size = strlen(symname); 1229 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1230 return -ENAMETOOLONG; 1231 1232 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1233 } 1234 1235 /** 1236 * gfs2_mkdir - Make a directory 1237 * @idmap: idmap of the mount the inode was found from 1238 * @dir: The parent directory of the new one 1239 * @dentry: The dentry of the new directory 1240 * @mode: The mode of the new directory 1241 * 1242 * Returns: errno 1243 */ 1244 1245 static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1246 struct dentry *dentry, umode_t mode) 1247 { 1248 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1249 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1250 } 1251 1252 /** 1253 * gfs2_mknod - Make a special file 1254 * @idmap: idmap of the mount the inode was found from 1255 * @dir: The directory in which the special file will reside 1256 * @dentry: The dentry of the special file 1257 * @mode: The mode of the special file 1258 * @dev: The device specification of the special file 1259 * 1260 */ 1261 1262 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir, 1263 struct dentry *dentry, umode_t mode, dev_t dev) 1264 { 1265 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1266 } 1267 1268 /** 1269 * gfs2_atomic_open - Atomically open a file 1270 * @dir: The directory 1271 * @dentry: The proposed new entry 1272 * @file: The proposed new struct file 1273 * @flags: open flags 1274 * @mode: File mode 1275 * 1276 * Returns: error code or 0 for success 1277 */ 1278 1279 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1280 struct file *file, unsigned flags, 1281 umode_t mode) 1282 { 1283 struct dentry *d; 1284 bool excl = !!(flags & O_EXCL); 1285 1286 if (!d_in_lookup(dentry)) 1287 goto skip_lookup; 1288 1289 d = __gfs2_lookup(dir, dentry, file); 1290 if (IS_ERR(d)) 1291 return PTR_ERR(d); 1292 if (d != NULL) 1293 dentry = d; 1294 if (d_really_is_positive(dentry)) { 1295 if (!(file->f_mode & FMODE_OPENED)) 1296 return finish_no_open(file, d); 1297 dput(d); 1298 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1299 } 1300 1301 BUG_ON(d != NULL); 1302 1303 skip_lookup: 1304 if (!(flags & O_CREAT)) 1305 return -ENOENT; 1306 1307 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1308 } 1309 1310 /* 1311 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1312 * @this: move this 1313 * @to: to here 1314 * 1315 * Follow @to back to the root and make sure we don't encounter @this 1316 * Assumes we already hold the rename lock. 1317 * 1318 * Returns: errno 1319 */ 1320 1321 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1322 { 1323 struct inode *dir = &to->i_inode; 1324 struct super_block *sb = dir->i_sb; 1325 struct inode *tmp; 1326 int error = 0; 1327 1328 igrab(dir); 1329 1330 for (;;) { 1331 if (dir == &this->i_inode) { 1332 error = -EINVAL; 1333 break; 1334 } 1335 if (dir == d_inode(sb->s_root)) { 1336 error = 0; 1337 break; 1338 } 1339 1340 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1341 if (!tmp) { 1342 error = -ENOENT; 1343 break; 1344 } 1345 if (IS_ERR(tmp)) { 1346 error = PTR_ERR(tmp); 1347 break; 1348 } 1349 1350 iput(dir); 1351 dir = tmp; 1352 } 1353 1354 iput(dir); 1355 1356 return error; 1357 } 1358 1359 /** 1360 * update_moved_ino - Update an inode that's being moved 1361 * @ip: The inode being moved 1362 * @ndip: The parent directory of the new filename 1363 * @dir_rename: True of ip is a directory 1364 * 1365 * Returns: errno 1366 */ 1367 1368 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1369 int dir_rename) 1370 { 1371 if (dir_rename) 1372 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1373 1374 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1375 mark_inode_dirty_sync(&ip->i_inode); 1376 return 0; 1377 } 1378 1379 1380 /** 1381 * gfs2_rename - Rename a file 1382 * @odir: Parent directory of old file name 1383 * @odentry: The old dentry of the file 1384 * @ndir: Parent directory of new file name 1385 * @ndentry: The new dentry of the file 1386 * 1387 * Returns: errno 1388 */ 1389 1390 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1391 struct inode *ndir, struct dentry *ndentry) 1392 { 1393 struct gfs2_inode *odip = GFS2_I(odir); 1394 struct gfs2_inode *ndip = GFS2_I(ndir); 1395 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1396 struct gfs2_inode *nip = NULL; 1397 struct gfs2_sbd *sdp = GFS2_SB(odir); 1398 struct gfs2_holder ghs[4], r_gh, rd_gh; 1399 struct gfs2_rgrpd *nrgd; 1400 unsigned int num_gh; 1401 int dir_rename = 0; 1402 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1403 unsigned int x; 1404 int error; 1405 1406 gfs2_holder_mark_uninitialized(&r_gh); 1407 gfs2_holder_mark_uninitialized(&rd_gh); 1408 if (d_really_is_positive(ndentry)) { 1409 nip = GFS2_I(d_inode(ndentry)); 1410 if (ip == nip) 1411 return 0; 1412 } 1413 1414 error = gfs2_rindex_update(sdp); 1415 if (error) 1416 return error; 1417 1418 error = gfs2_qa_get(ndip); 1419 if (error) 1420 return error; 1421 1422 if (odip != ndip) { 1423 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1424 0, &r_gh); 1425 if (error) 1426 goto out; 1427 1428 if (S_ISDIR(ip->i_inode.i_mode)) { 1429 dir_rename = 1; 1430 /* don't move a directory into its subdir */ 1431 error = gfs2_ok_to_move(ip, ndip); 1432 if (error) 1433 goto out_gunlock_r; 1434 } 1435 } 1436 1437 num_gh = 1; 1438 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1439 if (odip != ndip) { 1440 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1441 ghs + num_gh); 1442 num_gh++; 1443 } 1444 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1445 num_gh++; 1446 1447 if (nip) { 1448 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1449 ghs + num_gh); 1450 num_gh++; 1451 } 1452 1453 for (x = 0; x < num_gh; x++) { 1454 error = gfs2_glock_nq(ghs + x); 1455 if (error) 1456 goto out_gunlock; 1457 } 1458 error = gfs2_glock_async_wait(num_gh, ghs); 1459 if (error) 1460 goto out_gunlock; 1461 1462 if (nip) { 1463 /* Grab the resource group glock for unlink flag twiddling. 1464 * This is the case where the target dinode already exists 1465 * so we unlink before doing the rename. 1466 */ 1467 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1468 if (!nrgd) { 1469 error = -ENOENT; 1470 goto out_gunlock; 1471 } 1472 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1473 LM_FLAG_NODE_SCOPE, &rd_gh); 1474 if (error) 1475 goto out_gunlock; 1476 } 1477 1478 error = -ENOENT; 1479 if (ip->i_inode.i_nlink == 0) 1480 goto out_gunlock; 1481 1482 /* Check out the old directory */ 1483 1484 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1485 if (error) 1486 goto out_gunlock; 1487 1488 /* Check out the new directory */ 1489 1490 if (nip) { 1491 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1492 if (error) 1493 goto out_gunlock; 1494 1495 if (nip->i_inode.i_nlink == 0) { 1496 error = -EAGAIN; 1497 goto out_gunlock; 1498 } 1499 1500 if (S_ISDIR(nip->i_inode.i_mode)) { 1501 if (nip->i_entries < 2) { 1502 gfs2_consist_inode(nip); 1503 error = -EIO; 1504 goto out_gunlock; 1505 } 1506 if (nip->i_entries > 2) { 1507 error = -ENOTEMPTY; 1508 goto out_gunlock; 1509 } 1510 } 1511 } else { 1512 error = gfs2_permission(&nop_mnt_idmap, ndir, 1513 MAY_WRITE | MAY_EXEC); 1514 if (error) 1515 goto out_gunlock; 1516 1517 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1518 switch (error) { 1519 case -ENOENT: 1520 error = 0; 1521 break; 1522 case 0: 1523 error = -EEXIST; 1524 goto out_gunlock; 1525 default: 1526 goto out_gunlock; 1527 } 1528 1529 if (odip != ndip) { 1530 if (!ndip->i_inode.i_nlink) { 1531 error = -ENOENT; 1532 goto out_gunlock; 1533 } 1534 if (ndip->i_entries == (u32)-1) { 1535 error = -EFBIG; 1536 goto out_gunlock; 1537 } 1538 if (S_ISDIR(ip->i_inode.i_mode) && 1539 ndip->i_inode.i_nlink == (u32)-1) { 1540 error = -EMLINK; 1541 goto out_gunlock; 1542 } 1543 } 1544 } 1545 1546 /* Check out the dir to be renamed */ 1547 1548 if (dir_rename) { 1549 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry), 1550 MAY_WRITE); 1551 if (error) 1552 goto out_gunlock; 1553 } 1554 1555 if (nip == NULL) { 1556 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1557 if (error) 1558 goto out_gunlock; 1559 } 1560 1561 if (da.nr_blocks) { 1562 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1563 error = gfs2_quota_lock_check(ndip, &ap); 1564 if (error) 1565 goto out_gunlock; 1566 1567 error = gfs2_inplace_reserve(ndip, &ap); 1568 if (error) 1569 goto out_gunlock_q; 1570 1571 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1572 4 * RES_LEAF + 4, 0); 1573 if (error) 1574 goto out_ipreserv; 1575 } else { 1576 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1577 5 * RES_LEAF + 4, 0); 1578 if (error) 1579 goto out_gunlock; 1580 } 1581 1582 /* Remove the target file, if it exists */ 1583 1584 if (nip) 1585 error = gfs2_unlink_inode(ndip, ndentry); 1586 1587 error = update_moved_ino(ip, ndip, dir_rename); 1588 if (error) 1589 goto out_end_trans; 1590 1591 error = gfs2_dir_del(odip, odentry); 1592 if (error) 1593 goto out_end_trans; 1594 1595 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1596 if (error) 1597 goto out_end_trans; 1598 1599 out_end_trans: 1600 gfs2_trans_end(sdp); 1601 out_ipreserv: 1602 if (da.nr_blocks) 1603 gfs2_inplace_release(ndip); 1604 out_gunlock_q: 1605 if (da.nr_blocks) 1606 gfs2_quota_unlock(ndip); 1607 out_gunlock: 1608 gfs2_dir_no_add(&da); 1609 if (gfs2_holder_initialized(&rd_gh)) 1610 gfs2_glock_dq_uninit(&rd_gh); 1611 1612 while (x--) { 1613 if (gfs2_holder_queued(ghs + x)) 1614 gfs2_glock_dq(ghs + x); 1615 gfs2_holder_uninit(ghs + x); 1616 } 1617 out_gunlock_r: 1618 if (gfs2_holder_initialized(&r_gh)) 1619 gfs2_glock_dq_uninit(&r_gh); 1620 out: 1621 gfs2_qa_put(ndip); 1622 return error; 1623 } 1624 1625 /** 1626 * gfs2_exchange - exchange two files 1627 * @odir: Parent directory of old file name 1628 * @odentry: The old dentry of the file 1629 * @ndir: Parent directory of new file name 1630 * @ndentry: The new dentry of the file 1631 * @flags: The rename flags 1632 * 1633 * Returns: errno 1634 */ 1635 1636 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1637 struct inode *ndir, struct dentry *ndentry, 1638 unsigned int flags) 1639 { 1640 struct gfs2_inode *odip = GFS2_I(odir); 1641 struct gfs2_inode *ndip = GFS2_I(ndir); 1642 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1643 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1644 struct gfs2_sbd *sdp = GFS2_SB(odir); 1645 struct gfs2_holder ghs[4], r_gh; 1646 unsigned int num_gh; 1647 unsigned int x; 1648 umode_t old_mode = oip->i_inode.i_mode; 1649 umode_t new_mode = nip->i_inode.i_mode; 1650 int error; 1651 1652 gfs2_holder_mark_uninitialized(&r_gh); 1653 error = gfs2_rindex_update(sdp); 1654 if (error) 1655 return error; 1656 1657 if (odip != ndip) { 1658 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1659 0, &r_gh); 1660 if (error) 1661 goto out; 1662 1663 if (S_ISDIR(old_mode)) { 1664 /* don't move a directory into its subdir */ 1665 error = gfs2_ok_to_move(oip, ndip); 1666 if (error) 1667 goto out_gunlock_r; 1668 } 1669 1670 if (S_ISDIR(new_mode)) { 1671 /* don't move a directory into its subdir */ 1672 error = gfs2_ok_to_move(nip, odip); 1673 if (error) 1674 goto out_gunlock_r; 1675 } 1676 } 1677 1678 num_gh = 1; 1679 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1680 if (odip != ndip) { 1681 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1682 ghs + num_gh); 1683 num_gh++; 1684 } 1685 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1686 num_gh++; 1687 1688 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1689 num_gh++; 1690 1691 for (x = 0; x < num_gh; x++) { 1692 error = gfs2_glock_nq(ghs + x); 1693 if (error) 1694 goto out_gunlock; 1695 } 1696 1697 error = gfs2_glock_async_wait(num_gh, ghs); 1698 if (error) 1699 goto out_gunlock; 1700 1701 error = -ENOENT; 1702 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1703 goto out_gunlock; 1704 1705 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1706 if (error) 1707 goto out_gunlock; 1708 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1709 if (error) 1710 goto out_gunlock; 1711 1712 if (S_ISDIR(old_mode)) { 1713 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode, 1714 MAY_WRITE); 1715 if (error) 1716 goto out_gunlock; 1717 } 1718 if (S_ISDIR(new_mode)) { 1719 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode, 1720 MAY_WRITE); 1721 if (error) 1722 goto out_gunlock; 1723 } 1724 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1725 if (error) 1726 goto out_gunlock; 1727 1728 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1729 if (error) 1730 goto out_end_trans; 1731 1732 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1733 if (error) 1734 goto out_end_trans; 1735 1736 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1737 IF2DT(old_mode)); 1738 if (error) 1739 goto out_end_trans; 1740 1741 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1742 IF2DT(new_mode)); 1743 if (error) 1744 goto out_end_trans; 1745 1746 if (odip != ndip) { 1747 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1748 inc_nlink(&odip->i_inode); 1749 drop_nlink(&ndip->i_inode); 1750 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1751 inc_nlink(&ndip->i_inode); 1752 drop_nlink(&odip->i_inode); 1753 } 1754 } 1755 mark_inode_dirty(&ndip->i_inode); 1756 if (odip != ndip) 1757 mark_inode_dirty(&odip->i_inode); 1758 1759 out_end_trans: 1760 gfs2_trans_end(sdp); 1761 out_gunlock: 1762 while (x--) { 1763 if (gfs2_holder_queued(ghs + x)) 1764 gfs2_glock_dq(ghs + x); 1765 gfs2_holder_uninit(ghs + x); 1766 } 1767 out_gunlock_r: 1768 if (gfs2_holder_initialized(&r_gh)) 1769 gfs2_glock_dq_uninit(&r_gh); 1770 out: 1771 return error; 1772 } 1773 1774 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir, 1775 struct dentry *odentry, struct inode *ndir, 1776 struct dentry *ndentry, unsigned int flags) 1777 { 1778 flags &= ~RENAME_NOREPLACE; 1779 1780 if (flags & ~RENAME_EXCHANGE) 1781 return -EINVAL; 1782 1783 if (flags & RENAME_EXCHANGE) 1784 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1785 1786 return gfs2_rename(odir, odentry, ndir, ndentry); 1787 } 1788 1789 /** 1790 * gfs2_get_link - Follow a symbolic link 1791 * @dentry: The dentry of the link 1792 * @inode: The inode of the link 1793 * @done: destructor for return value 1794 * 1795 * This can handle symlinks of any size. 1796 * 1797 * Returns: 0 on success or error code 1798 */ 1799 1800 static const char *gfs2_get_link(struct dentry *dentry, 1801 struct inode *inode, 1802 struct delayed_call *done) 1803 { 1804 struct gfs2_inode *ip = GFS2_I(inode); 1805 struct gfs2_holder i_gh; 1806 struct buffer_head *dibh; 1807 unsigned int size; 1808 char *buf; 1809 int error; 1810 1811 if (!dentry) 1812 return ERR_PTR(-ECHILD); 1813 1814 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1815 error = gfs2_glock_nq(&i_gh); 1816 if (error) { 1817 gfs2_holder_uninit(&i_gh); 1818 return ERR_PTR(error); 1819 } 1820 1821 size = (unsigned int)i_size_read(&ip->i_inode); 1822 if (size == 0) { 1823 gfs2_consist_inode(ip); 1824 buf = ERR_PTR(-EIO); 1825 goto out; 1826 } 1827 1828 error = gfs2_meta_inode_buffer(ip, &dibh); 1829 if (error) { 1830 buf = ERR_PTR(error); 1831 goto out; 1832 } 1833 1834 buf = kzalloc(size + 1, GFP_NOFS); 1835 if (!buf) 1836 buf = ERR_PTR(-ENOMEM); 1837 else 1838 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1839 brelse(dibh); 1840 out: 1841 gfs2_glock_dq_uninit(&i_gh); 1842 if (!IS_ERR(buf)) 1843 set_delayed_call(done, kfree_link, buf); 1844 return buf; 1845 } 1846 1847 /** 1848 * gfs2_permission 1849 * @idmap: idmap of the mount the inode was found from 1850 * @inode: The inode 1851 * @mask: The mask to be tested 1852 * 1853 * This may be called from the VFS directly, or from within GFS2 with the 1854 * inode locked, so we look to see if the glock is already locked and only 1855 * lock the glock if its not already been done. 1856 * 1857 * Returns: errno 1858 */ 1859 1860 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode, 1861 int mask) 1862 { 1863 struct gfs2_inode *ip; 1864 struct gfs2_holder i_gh; 1865 int error; 1866 1867 gfs2_holder_mark_uninitialized(&i_gh); 1868 ip = GFS2_I(inode); 1869 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1870 if (mask & MAY_NOT_BLOCK) 1871 return -ECHILD; 1872 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1873 if (error) 1874 return error; 1875 } 1876 1877 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1878 error = -EPERM; 1879 else 1880 error = generic_permission(&nop_mnt_idmap, inode, mask); 1881 if (gfs2_holder_initialized(&i_gh)) 1882 gfs2_glock_dq_uninit(&i_gh); 1883 1884 return error; 1885 } 1886 1887 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1888 { 1889 setattr_copy(&nop_mnt_idmap, inode, attr); 1890 mark_inode_dirty(inode); 1891 return 0; 1892 } 1893 1894 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1895 { 1896 int error; 1897 1898 if (current->journal_info) 1899 return __gfs2_setattr_simple(inode, attr); 1900 1901 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1902 if (error) 1903 return error; 1904 1905 error = __gfs2_setattr_simple(inode, attr); 1906 gfs2_trans_end(GFS2_SB(inode)); 1907 return error; 1908 } 1909 1910 static int setattr_chown(struct inode *inode, struct iattr *attr) 1911 { 1912 struct gfs2_inode *ip = GFS2_I(inode); 1913 struct gfs2_sbd *sdp = GFS2_SB(inode); 1914 kuid_t ouid, nuid; 1915 kgid_t ogid, ngid; 1916 int error; 1917 struct gfs2_alloc_parms ap; 1918 1919 ouid = inode->i_uid; 1920 ogid = inode->i_gid; 1921 nuid = attr->ia_uid; 1922 ngid = attr->ia_gid; 1923 1924 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1925 ouid = nuid = NO_UID_QUOTA_CHANGE; 1926 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1927 ogid = ngid = NO_GID_QUOTA_CHANGE; 1928 error = gfs2_qa_get(ip); 1929 if (error) 1930 return error; 1931 1932 error = gfs2_rindex_update(sdp); 1933 if (error) 1934 goto out; 1935 1936 error = gfs2_quota_lock(ip, nuid, ngid); 1937 if (error) 1938 goto out; 1939 1940 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1941 1942 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1943 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1944 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1945 if (error) 1946 goto out_gunlock_q; 1947 } 1948 1949 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1950 if (error) 1951 goto out_gunlock_q; 1952 1953 error = gfs2_setattr_simple(inode, attr); 1954 if (error) 1955 goto out_end_trans; 1956 1957 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1958 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1959 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1960 gfs2_quota_change(ip, ap.target, nuid, ngid); 1961 } 1962 1963 out_end_trans: 1964 gfs2_trans_end(sdp); 1965 out_gunlock_q: 1966 gfs2_quota_unlock(ip); 1967 out: 1968 gfs2_qa_put(ip); 1969 return error; 1970 } 1971 1972 /** 1973 * gfs2_setattr - Change attributes on an inode 1974 * @idmap: idmap of the mount the inode was found from 1975 * @dentry: The dentry which is changing 1976 * @attr: The structure describing the change 1977 * 1978 * The VFS layer wants to change one or more of an inodes attributes. Write 1979 * that change out to disk. 1980 * 1981 * Returns: errno 1982 */ 1983 1984 static int gfs2_setattr(struct mnt_idmap *idmap, 1985 struct dentry *dentry, struct iattr *attr) 1986 { 1987 struct inode *inode = d_inode(dentry); 1988 struct gfs2_inode *ip = GFS2_I(inode); 1989 struct gfs2_holder i_gh; 1990 int error; 1991 1992 error = gfs2_qa_get(ip); 1993 if (error) 1994 return error; 1995 1996 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1997 if (error) 1998 goto out; 1999 2000 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid); 2001 if (error) 2002 goto error; 2003 2004 error = setattr_prepare(&nop_mnt_idmap, dentry, attr); 2005 if (error) 2006 goto error; 2007 2008 if (attr->ia_valid & ATTR_SIZE) 2009 error = gfs2_setattr_size(inode, attr->ia_size); 2010 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2011 error = setattr_chown(inode, attr); 2012 else { 2013 error = gfs2_setattr_simple(inode, attr); 2014 if (!error && attr->ia_valid & ATTR_MODE) 2015 error = posix_acl_chmod(&nop_mnt_idmap, dentry, 2016 inode->i_mode); 2017 } 2018 2019 error: 2020 if (!error) 2021 mark_inode_dirty(inode); 2022 gfs2_glock_dq_uninit(&i_gh); 2023 out: 2024 gfs2_qa_put(ip); 2025 return error; 2026 } 2027 2028 /** 2029 * gfs2_getattr - Read out an inode's attributes 2030 * @idmap: idmap of the mount the inode was found from 2031 * @path: Object to query 2032 * @stat: The inode's stats 2033 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2034 * @flags: AT_STATX_xxx setting 2035 * 2036 * This may be called from the VFS directly, or from within GFS2 with the 2037 * inode locked, so we look to see if the glock is already locked and only 2038 * lock the glock if its not already been done. Note that its the NFS 2039 * readdirplus operation which causes this to be called (from filldir) 2040 * with the glock already held. 2041 * 2042 * Returns: errno 2043 */ 2044 2045 static int gfs2_getattr(struct mnt_idmap *idmap, 2046 const struct path *path, struct kstat *stat, 2047 u32 request_mask, unsigned int flags) 2048 { 2049 struct inode *inode = d_inode(path->dentry); 2050 struct gfs2_inode *ip = GFS2_I(inode); 2051 struct gfs2_holder gh; 2052 u32 gfsflags; 2053 int error; 2054 2055 gfs2_holder_mark_uninitialized(&gh); 2056 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2057 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2058 if (error) 2059 return error; 2060 } 2061 2062 gfsflags = ip->i_diskflags; 2063 if (gfsflags & GFS2_DIF_APPENDONLY) 2064 stat->attributes |= STATX_ATTR_APPEND; 2065 if (gfsflags & GFS2_DIF_IMMUTABLE) 2066 stat->attributes |= STATX_ATTR_IMMUTABLE; 2067 2068 stat->attributes_mask |= (STATX_ATTR_APPEND | 2069 STATX_ATTR_COMPRESSED | 2070 STATX_ATTR_ENCRYPTED | 2071 STATX_ATTR_IMMUTABLE | 2072 STATX_ATTR_NODUMP); 2073 2074 generic_fillattr(&nop_mnt_idmap, inode, stat); 2075 2076 if (gfs2_holder_initialized(&gh)) 2077 gfs2_glock_dq_uninit(&gh); 2078 2079 return 0; 2080 } 2081 2082 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2083 u64 start, u64 len) 2084 { 2085 struct gfs2_inode *ip = GFS2_I(inode); 2086 struct gfs2_holder gh; 2087 int ret; 2088 2089 inode_lock_shared(inode); 2090 2091 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2092 if (ret) 2093 goto out; 2094 2095 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2096 2097 gfs2_glock_dq_uninit(&gh); 2098 2099 out: 2100 inode_unlock_shared(inode); 2101 return ret; 2102 } 2103 2104 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2105 { 2106 struct inode *inode = file->f_mapping->host; 2107 struct gfs2_inode *ip = GFS2_I(inode); 2108 struct gfs2_holder gh; 2109 loff_t ret; 2110 2111 inode_lock_shared(inode); 2112 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2113 if (!ret) 2114 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2115 gfs2_glock_dq_uninit(&gh); 2116 inode_unlock_shared(inode); 2117 2118 if (ret < 0) 2119 return ret; 2120 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2121 } 2122 2123 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2124 { 2125 struct inode *inode = file->f_mapping->host; 2126 struct gfs2_inode *ip = GFS2_I(inode); 2127 struct gfs2_holder gh; 2128 loff_t ret; 2129 2130 inode_lock_shared(inode); 2131 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2132 if (!ret) 2133 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2134 gfs2_glock_dq_uninit(&gh); 2135 inode_unlock_shared(inode); 2136 2137 if (ret < 0) 2138 return ret; 2139 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2140 } 2141 2142 static int gfs2_update_time(struct inode *inode, struct timespec64 *time, 2143 int flags) 2144 { 2145 struct gfs2_inode *ip = GFS2_I(inode); 2146 struct gfs2_glock *gl = ip->i_gl; 2147 struct gfs2_holder *gh; 2148 int error; 2149 2150 gh = gfs2_glock_is_locked_by_me(gl); 2151 if (gh && !gfs2_glock_is_held_excl(gl)) { 2152 gfs2_glock_dq(gh); 2153 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2154 error = gfs2_glock_nq(gh); 2155 if (error) 2156 return error; 2157 } 2158 return generic_update_time(inode, time, flags); 2159 } 2160 2161 static const struct inode_operations gfs2_file_iops = { 2162 .permission = gfs2_permission, 2163 .setattr = gfs2_setattr, 2164 .getattr = gfs2_getattr, 2165 .listxattr = gfs2_listxattr, 2166 .fiemap = gfs2_fiemap, 2167 .get_inode_acl = gfs2_get_acl, 2168 .set_acl = gfs2_set_acl, 2169 .update_time = gfs2_update_time, 2170 .fileattr_get = gfs2_fileattr_get, 2171 .fileattr_set = gfs2_fileattr_set, 2172 }; 2173 2174 static const struct inode_operations gfs2_dir_iops = { 2175 .create = gfs2_create, 2176 .lookup = gfs2_lookup, 2177 .link = gfs2_link, 2178 .unlink = gfs2_unlink, 2179 .symlink = gfs2_symlink, 2180 .mkdir = gfs2_mkdir, 2181 .rmdir = gfs2_unlink, 2182 .mknod = gfs2_mknod, 2183 .rename = gfs2_rename2, 2184 .permission = gfs2_permission, 2185 .setattr = gfs2_setattr, 2186 .getattr = gfs2_getattr, 2187 .listxattr = gfs2_listxattr, 2188 .fiemap = gfs2_fiemap, 2189 .get_inode_acl = gfs2_get_acl, 2190 .set_acl = gfs2_set_acl, 2191 .update_time = gfs2_update_time, 2192 .atomic_open = gfs2_atomic_open, 2193 .fileattr_get = gfs2_fileattr_get, 2194 .fileattr_set = gfs2_fileattr_set, 2195 }; 2196 2197 static const struct inode_operations gfs2_symlink_iops = { 2198 .get_link = gfs2_get_link, 2199 .permission = gfs2_permission, 2200 .setattr = gfs2_setattr, 2201 .getattr = gfs2_getattr, 2202 .listxattr = gfs2_listxattr, 2203 .fiemap = gfs2_fiemap, 2204 }; 2205 2206