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 ghs[2]; 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, ghs); 957 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 958 959 error = gfs2_glock_nq(ghs); /* parent */ 960 if (error) 961 goto out_parent; 962 963 error = gfs2_glock_nq(ghs + 1); /* child */ 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 = -EINVAL; 996 if (!ip->i_inode.i_nlink) 997 goto out_gunlock; 998 error = -EMLINK; 999 if (ip->i_inode.i_nlink == (u32)-1) 1000 goto out_gunlock; 1001 1002 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 1003 if (error < 0) 1004 goto out_gunlock; 1005 1006 if (da.nr_blocks) { 1007 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1008 error = gfs2_quota_lock_check(dip, &ap); 1009 if (error) 1010 goto out_gunlock; 1011 1012 error = gfs2_inplace_reserve(dip, &ap); 1013 if (error) 1014 goto out_gunlock_q; 1015 1016 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1017 if (error) 1018 goto out_ipres; 1019 } else { 1020 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1021 if (error) 1022 goto out_ipres; 1023 } 1024 1025 error = gfs2_meta_inode_buffer(ip, &dibh); 1026 if (error) 1027 goto out_end_trans; 1028 1029 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1030 if (error) 1031 goto out_brelse; 1032 1033 gfs2_trans_add_meta(ip->i_gl, dibh); 1034 inc_nlink(&ip->i_inode); 1035 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1036 ihold(inode); 1037 d_instantiate(dentry, inode); 1038 mark_inode_dirty(inode); 1039 1040 out_brelse: 1041 brelse(dibh); 1042 out_end_trans: 1043 gfs2_trans_end(sdp); 1044 out_ipres: 1045 if (da.nr_blocks) 1046 gfs2_inplace_release(dip); 1047 out_gunlock_q: 1048 if (da.nr_blocks) 1049 gfs2_quota_unlock(dip); 1050 out_gunlock: 1051 gfs2_dir_no_add(&da); 1052 gfs2_glock_dq(ghs + 1); 1053 out_child: 1054 gfs2_glock_dq(ghs); 1055 out_parent: 1056 gfs2_qa_put(dip); 1057 gfs2_holder_uninit(ghs); 1058 gfs2_holder_uninit(ghs + 1); 1059 return error; 1060 } 1061 1062 /* 1063 * gfs2_unlink_ok - check to see that a inode is still in a directory 1064 * @dip: the directory 1065 * @name: the name of the file 1066 * @ip: the inode 1067 * 1068 * Assumes that the lock on (at least) @dip is held. 1069 * 1070 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1071 */ 1072 1073 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1074 const struct gfs2_inode *ip) 1075 { 1076 int error; 1077 1078 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1079 return -EPERM; 1080 1081 if ((dip->i_inode.i_mode & S_ISVTX) && 1082 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1083 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1084 return -EPERM; 1085 1086 if (IS_APPEND(&dip->i_inode)) 1087 return -EPERM; 1088 1089 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 1090 MAY_WRITE | MAY_EXEC); 1091 if (error) 1092 return error; 1093 1094 return gfs2_dir_check(&dip->i_inode, name, ip); 1095 } 1096 1097 /** 1098 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1099 * @dip: The parent directory 1100 * @dentry: The dentry to unlink 1101 * 1102 * Called with all the locks and in a transaction. This will only be 1103 * called for a directory after it has been checked to ensure it is empty. 1104 * 1105 * Returns: 0 on success, or an error 1106 */ 1107 1108 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1109 const struct dentry *dentry) 1110 { 1111 struct inode *inode = d_inode(dentry); 1112 struct gfs2_inode *ip = GFS2_I(inode); 1113 int error; 1114 1115 error = gfs2_dir_del(dip, dentry); 1116 if (error) 1117 return error; 1118 1119 ip->i_entries = 0; 1120 inode->i_ctime = current_time(inode); 1121 if (S_ISDIR(inode->i_mode)) 1122 clear_nlink(inode); 1123 else 1124 drop_nlink(inode); 1125 mark_inode_dirty(inode); 1126 if (inode->i_nlink == 0) 1127 gfs2_unlink_di(inode); 1128 return 0; 1129 } 1130 1131 1132 /** 1133 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1134 * @dir: The inode of the directory containing the inode to unlink 1135 * @dentry: The file itself 1136 * 1137 * This routine uses the type of the inode as a flag to figure out 1138 * whether this is an unlink or an rmdir. 1139 * 1140 * Returns: errno 1141 */ 1142 1143 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1144 { 1145 struct gfs2_inode *dip = GFS2_I(dir); 1146 struct gfs2_sbd *sdp = GFS2_SB(dir); 1147 struct inode *inode = d_inode(dentry); 1148 struct gfs2_inode *ip = GFS2_I(inode); 1149 struct gfs2_holder ghs[3]; 1150 struct gfs2_rgrpd *rgd; 1151 int error; 1152 1153 error = gfs2_rindex_update(sdp); 1154 if (error) 1155 return error; 1156 1157 error = -EROFS; 1158 1159 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1160 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1161 1162 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1163 if (!rgd) 1164 goto out_inodes; 1165 1166 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2); 1167 1168 1169 error = gfs2_glock_nq(ghs); /* parent */ 1170 if (error) 1171 goto out_parent; 1172 1173 error = gfs2_glock_nq(ghs + 1); /* child */ 1174 if (error) 1175 goto out_child; 1176 1177 error = -ENOENT; 1178 if (inode->i_nlink == 0) 1179 goto out_rgrp; 1180 1181 if (S_ISDIR(inode->i_mode)) { 1182 error = -ENOTEMPTY; 1183 if (ip->i_entries > 2 || inode->i_nlink > 2) 1184 goto out_rgrp; 1185 } 1186 1187 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1188 if (error) 1189 goto out_rgrp; 1190 1191 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1192 if (error) 1193 goto out_gunlock; 1194 1195 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1196 if (error) 1197 goto out_gunlock; 1198 1199 error = gfs2_unlink_inode(dip, dentry); 1200 gfs2_trans_end(sdp); 1201 1202 out_gunlock: 1203 gfs2_glock_dq(ghs + 2); 1204 out_rgrp: 1205 gfs2_glock_dq(ghs + 1); 1206 out_child: 1207 gfs2_glock_dq(ghs); 1208 out_parent: 1209 gfs2_holder_uninit(ghs + 2); 1210 out_inodes: 1211 gfs2_holder_uninit(ghs + 1); 1212 gfs2_holder_uninit(ghs); 1213 return error; 1214 } 1215 1216 /** 1217 * gfs2_symlink - Create a symlink 1218 * @idmap: idmap of the mount the inode was found from 1219 * @dir: The directory to create the symlink in 1220 * @dentry: The dentry to put the symlink in 1221 * @symname: The thing which the link points to 1222 * 1223 * Returns: errno 1224 */ 1225 1226 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir, 1227 struct dentry *dentry, const char *symname) 1228 { 1229 unsigned int size; 1230 1231 size = strlen(symname); 1232 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1233 return -ENAMETOOLONG; 1234 1235 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1236 } 1237 1238 /** 1239 * gfs2_mkdir - Make a directory 1240 * @idmap: idmap of the mount the inode was found from 1241 * @dir: The parent directory of the new one 1242 * @dentry: The dentry of the new directory 1243 * @mode: The mode of the new directory 1244 * 1245 * Returns: errno 1246 */ 1247 1248 static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1249 struct dentry *dentry, umode_t mode) 1250 { 1251 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1252 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1253 } 1254 1255 /** 1256 * gfs2_mknod - Make a special file 1257 * @idmap: idmap of the mount the inode was found from 1258 * @dir: The directory in which the special file will reside 1259 * @dentry: The dentry of the special file 1260 * @mode: The mode of the special file 1261 * @dev: The device specification of the special file 1262 * 1263 */ 1264 1265 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir, 1266 struct dentry *dentry, umode_t mode, dev_t dev) 1267 { 1268 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1269 } 1270 1271 /** 1272 * gfs2_atomic_open - Atomically open a file 1273 * @dir: The directory 1274 * @dentry: The proposed new entry 1275 * @file: The proposed new struct file 1276 * @flags: open flags 1277 * @mode: File mode 1278 * 1279 * Returns: error code or 0 for success 1280 */ 1281 1282 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1283 struct file *file, unsigned flags, 1284 umode_t mode) 1285 { 1286 struct dentry *d; 1287 bool excl = !!(flags & O_EXCL); 1288 1289 if (!d_in_lookup(dentry)) 1290 goto skip_lookup; 1291 1292 d = __gfs2_lookup(dir, dentry, file); 1293 if (IS_ERR(d)) 1294 return PTR_ERR(d); 1295 if (d != NULL) 1296 dentry = d; 1297 if (d_really_is_positive(dentry)) { 1298 if (!(file->f_mode & FMODE_OPENED)) 1299 return finish_no_open(file, d); 1300 dput(d); 1301 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1302 } 1303 1304 BUG_ON(d != NULL); 1305 1306 skip_lookup: 1307 if (!(flags & O_CREAT)) 1308 return -ENOENT; 1309 1310 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1311 } 1312 1313 /* 1314 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1315 * @this: move this 1316 * @to: to here 1317 * 1318 * Follow @to back to the root and make sure we don't encounter @this 1319 * Assumes we already hold the rename lock. 1320 * 1321 * Returns: errno 1322 */ 1323 1324 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1325 { 1326 struct inode *dir = &to->i_inode; 1327 struct super_block *sb = dir->i_sb; 1328 struct inode *tmp; 1329 int error = 0; 1330 1331 igrab(dir); 1332 1333 for (;;) { 1334 if (dir == &this->i_inode) { 1335 error = -EINVAL; 1336 break; 1337 } 1338 if (dir == d_inode(sb->s_root)) { 1339 error = 0; 1340 break; 1341 } 1342 1343 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1344 if (!tmp) { 1345 error = -ENOENT; 1346 break; 1347 } 1348 if (IS_ERR(tmp)) { 1349 error = PTR_ERR(tmp); 1350 break; 1351 } 1352 1353 iput(dir); 1354 dir = tmp; 1355 } 1356 1357 iput(dir); 1358 1359 return error; 1360 } 1361 1362 /** 1363 * update_moved_ino - Update an inode that's being moved 1364 * @ip: The inode being moved 1365 * @ndip: The parent directory of the new filename 1366 * @dir_rename: True of ip is a directory 1367 * 1368 * Returns: errno 1369 */ 1370 1371 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1372 int dir_rename) 1373 { 1374 if (dir_rename) 1375 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1376 1377 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1378 mark_inode_dirty_sync(&ip->i_inode); 1379 return 0; 1380 } 1381 1382 1383 /** 1384 * gfs2_rename - Rename a file 1385 * @odir: Parent directory of old file name 1386 * @odentry: The old dentry of the file 1387 * @ndir: Parent directory of new file name 1388 * @ndentry: The new dentry of the file 1389 * 1390 * Returns: errno 1391 */ 1392 1393 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1394 struct inode *ndir, struct dentry *ndentry) 1395 { 1396 struct gfs2_inode *odip = GFS2_I(odir); 1397 struct gfs2_inode *ndip = GFS2_I(ndir); 1398 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1399 struct gfs2_inode *nip = NULL; 1400 struct gfs2_sbd *sdp = GFS2_SB(odir); 1401 struct gfs2_holder ghs[4], r_gh, rd_gh; 1402 struct gfs2_rgrpd *nrgd; 1403 unsigned int num_gh; 1404 int dir_rename = 0; 1405 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1406 unsigned int x; 1407 int error; 1408 1409 gfs2_holder_mark_uninitialized(&r_gh); 1410 gfs2_holder_mark_uninitialized(&rd_gh); 1411 if (d_really_is_positive(ndentry)) { 1412 nip = GFS2_I(d_inode(ndentry)); 1413 if (ip == nip) 1414 return 0; 1415 } 1416 1417 error = gfs2_rindex_update(sdp); 1418 if (error) 1419 return error; 1420 1421 error = gfs2_qa_get(ndip); 1422 if (error) 1423 return error; 1424 1425 if (odip != ndip) { 1426 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1427 0, &r_gh); 1428 if (error) 1429 goto out; 1430 1431 if (S_ISDIR(ip->i_inode.i_mode)) { 1432 dir_rename = 1; 1433 /* don't move a directory into its subdir */ 1434 error = gfs2_ok_to_move(ip, ndip); 1435 if (error) 1436 goto out_gunlock_r; 1437 } 1438 } 1439 1440 num_gh = 1; 1441 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1442 if (odip != ndip) { 1443 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1444 ghs + num_gh); 1445 num_gh++; 1446 } 1447 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1448 num_gh++; 1449 1450 if (nip) { 1451 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1452 ghs + num_gh); 1453 num_gh++; 1454 } 1455 1456 for (x = 0; x < num_gh; x++) { 1457 error = gfs2_glock_nq(ghs + x); 1458 if (error) 1459 goto out_gunlock; 1460 } 1461 error = gfs2_glock_async_wait(num_gh, ghs); 1462 if (error) 1463 goto out_gunlock; 1464 1465 if (nip) { 1466 /* Grab the resource group glock for unlink flag twiddling. 1467 * This is the case where the target dinode already exists 1468 * so we unlink before doing the rename. 1469 */ 1470 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1471 if (!nrgd) { 1472 error = -ENOENT; 1473 goto out_gunlock; 1474 } 1475 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1476 LM_FLAG_NODE_SCOPE, &rd_gh); 1477 if (error) 1478 goto out_gunlock; 1479 } 1480 1481 error = -ENOENT; 1482 if (ip->i_inode.i_nlink == 0) 1483 goto out_gunlock; 1484 1485 /* Check out the old directory */ 1486 1487 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1488 if (error) 1489 goto out_gunlock; 1490 1491 /* Check out the new directory */ 1492 1493 if (nip) { 1494 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1495 if (error) 1496 goto out_gunlock; 1497 1498 if (nip->i_inode.i_nlink == 0) { 1499 error = -EAGAIN; 1500 goto out_gunlock; 1501 } 1502 1503 if (S_ISDIR(nip->i_inode.i_mode)) { 1504 if (nip->i_entries < 2) { 1505 gfs2_consist_inode(nip); 1506 error = -EIO; 1507 goto out_gunlock; 1508 } 1509 if (nip->i_entries > 2) { 1510 error = -ENOTEMPTY; 1511 goto out_gunlock; 1512 } 1513 } 1514 } else { 1515 error = gfs2_permission(&nop_mnt_idmap, ndir, 1516 MAY_WRITE | MAY_EXEC); 1517 if (error) 1518 goto out_gunlock; 1519 1520 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1521 switch (error) { 1522 case -ENOENT: 1523 error = 0; 1524 break; 1525 case 0: 1526 error = -EEXIST; 1527 goto out_gunlock; 1528 default: 1529 goto out_gunlock; 1530 } 1531 1532 if (odip != ndip) { 1533 if (!ndip->i_inode.i_nlink) { 1534 error = -ENOENT; 1535 goto out_gunlock; 1536 } 1537 if (ndip->i_entries == (u32)-1) { 1538 error = -EFBIG; 1539 goto out_gunlock; 1540 } 1541 if (S_ISDIR(ip->i_inode.i_mode) && 1542 ndip->i_inode.i_nlink == (u32)-1) { 1543 error = -EMLINK; 1544 goto out_gunlock; 1545 } 1546 } 1547 } 1548 1549 /* Check out the dir to be renamed */ 1550 1551 if (dir_rename) { 1552 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry), 1553 MAY_WRITE); 1554 if (error) 1555 goto out_gunlock; 1556 } 1557 1558 if (nip == NULL) { 1559 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1560 if (error) 1561 goto out_gunlock; 1562 } 1563 1564 if (da.nr_blocks) { 1565 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1566 error = gfs2_quota_lock_check(ndip, &ap); 1567 if (error) 1568 goto out_gunlock; 1569 1570 error = gfs2_inplace_reserve(ndip, &ap); 1571 if (error) 1572 goto out_gunlock_q; 1573 1574 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1575 4 * RES_LEAF + 4, 0); 1576 if (error) 1577 goto out_ipreserv; 1578 } else { 1579 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1580 5 * RES_LEAF + 4, 0); 1581 if (error) 1582 goto out_gunlock; 1583 } 1584 1585 /* Remove the target file, if it exists */ 1586 1587 if (nip) 1588 error = gfs2_unlink_inode(ndip, ndentry); 1589 1590 error = update_moved_ino(ip, ndip, dir_rename); 1591 if (error) 1592 goto out_end_trans; 1593 1594 error = gfs2_dir_del(odip, odentry); 1595 if (error) 1596 goto out_end_trans; 1597 1598 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1599 if (error) 1600 goto out_end_trans; 1601 1602 out_end_trans: 1603 gfs2_trans_end(sdp); 1604 out_ipreserv: 1605 if (da.nr_blocks) 1606 gfs2_inplace_release(ndip); 1607 out_gunlock_q: 1608 if (da.nr_blocks) 1609 gfs2_quota_unlock(ndip); 1610 out_gunlock: 1611 gfs2_dir_no_add(&da); 1612 if (gfs2_holder_initialized(&rd_gh)) 1613 gfs2_glock_dq_uninit(&rd_gh); 1614 1615 while (x--) { 1616 if (gfs2_holder_queued(ghs + x)) 1617 gfs2_glock_dq(ghs + x); 1618 gfs2_holder_uninit(ghs + x); 1619 } 1620 out_gunlock_r: 1621 if (gfs2_holder_initialized(&r_gh)) 1622 gfs2_glock_dq_uninit(&r_gh); 1623 out: 1624 gfs2_qa_put(ndip); 1625 return error; 1626 } 1627 1628 /** 1629 * gfs2_exchange - exchange two files 1630 * @odir: Parent directory of old file name 1631 * @odentry: The old dentry of the file 1632 * @ndir: Parent directory of new file name 1633 * @ndentry: The new dentry of the file 1634 * @flags: The rename flags 1635 * 1636 * Returns: errno 1637 */ 1638 1639 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1640 struct inode *ndir, struct dentry *ndentry, 1641 unsigned int flags) 1642 { 1643 struct gfs2_inode *odip = GFS2_I(odir); 1644 struct gfs2_inode *ndip = GFS2_I(ndir); 1645 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1646 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1647 struct gfs2_sbd *sdp = GFS2_SB(odir); 1648 struct gfs2_holder ghs[4], r_gh; 1649 unsigned int num_gh; 1650 unsigned int x; 1651 umode_t old_mode = oip->i_inode.i_mode; 1652 umode_t new_mode = nip->i_inode.i_mode; 1653 int error; 1654 1655 gfs2_holder_mark_uninitialized(&r_gh); 1656 error = gfs2_rindex_update(sdp); 1657 if (error) 1658 return error; 1659 1660 if (odip != ndip) { 1661 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1662 0, &r_gh); 1663 if (error) 1664 goto out; 1665 1666 if (S_ISDIR(old_mode)) { 1667 /* don't move a directory into its subdir */ 1668 error = gfs2_ok_to_move(oip, ndip); 1669 if (error) 1670 goto out_gunlock_r; 1671 } 1672 1673 if (S_ISDIR(new_mode)) { 1674 /* don't move a directory into its subdir */ 1675 error = gfs2_ok_to_move(nip, odip); 1676 if (error) 1677 goto out_gunlock_r; 1678 } 1679 } 1680 1681 num_gh = 1; 1682 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1683 if (odip != ndip) { 1684 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1685 ghs + num_gh); 1686 num_gh++; 1687 } 1688 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1689 num_gh++; 1690 1691 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1692 num_gh++; 1693 1694 for (x = 0; x < num_gh; x++) { 1695 error = gfs2_glock_nq(ghs + x); 1696 if (error) 1697 goto out_gunlock; 1698 } 1699 1700 error = gfs2_glock_async_wait(num_gh, ghs); 1701 if (error) 1702 goto out_gunlock; 1703 1704 error = -ENOENT; 1705 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1706 goto out_gunlock; 1707 1708 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1709 if (error) 1710 goto out_gunlock; 1711 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1712 if (error) 1713 goto out_gunlock; 1714 1715 if (S_ISDIR(old_mode)) { 1716 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode, 1717 MAY_WRITE); 1718 if (error) 1719 goto out_gunlock; 1720 } 1721 if (S_ISDIR(new_mode)) { 1722 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode, 1723 MAY_WRITE); 1724 if (error) 1725 goto out_gunlock; 1726 } 1727 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1728 if (error) 1729 goto out_gunlock; 1730 1731 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1732 if (error) 1733 goto out_end_trans; 1734 1735 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1736 if (error) 1737 goto out_end_trans; 1738 1739 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1740 IF2DT(old_mode)); 1741 if (error) 1742 goto out_end_trans; 1743 1744 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1745 IF2DT(new_mode)); 1746 if (error) 1747 goto out_end_trans; 1748 1749 if (odip != ndip) { 1750 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1751 inc_nlink(&odip->i_inode); 1752 drop_nlink(&ndip->i_inode); 1753 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1754 inc_nlink(&ndip->i_inode); 1755 drop_nlink(&odip->i_inode); 1756 } 1757 } 1758 mark_inode_dirty(&ndip->i_inode); 1759 if (odip != ndip) 1760 mark_inode_dirty(&odip->i_inode); 1761 1762 out_end_trans: 1763 gfs2_trans_end(sdp); 1764 out_gunlock: 1765 while (x--) { 1766 if (gfs2_holder_queued(ghs + x)) 1767 gfs2_glock_dq(ghs + x); 1768 gfs2_holder_uninit(ghs + x); 1769 } 1770 out_gunlock_r: 1771 if (gfs2_holder_initialized(&r_gh)) 1772 gfs2_glock_dq_uninit(&r_gh); 1773 out: 1774 return error; 1775 } 1776 1777 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir, 1778 struct dentry *odentry, struct inode *ndir, 1779 struct dentry *ndentry, unsigned int flags) 1780 { 1781 flags &= ~RENAME_NOREPLACE; 1782 1783 if (flags & ~RENAME_EXCHANGE) 1784 return -EINVAL; 1785 1786 if (flags & RENAME_EXCHANGE) 1787 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1788 1789 return gfs2_rename(odir, odentry, ndir, ndentry); 1790 } 1791 1792 /** 1793 * gfs2_get_link - Follow a symbolic link 1794 * @dentry: The dentry of the link 1795 * @inode: The inode of the link 1796 * @done: destructor for return value 1797 * 1798 * This can handle symlinks of any size. 1799 * 1800 * Returns: 0 on success or error code 1801 */ 1802 1803 static const char *gfs2_get_link(struct dentry *dentry, 1804 struct inode *inode, 1805 struct delayed_call *done) 1806 { 1807 struct gfs2_inode *ip = GFS2_I(inode); 1808 struct gfs2_holder i_gh; 1809 struct buffer_head *dibh; 1810 unsigned int size; 1811 char *buf; 1812 int error; 1813 1814 if (!dentry) 1815 return ERR_PTR(-ECHILD); 1816 1817 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1818 error = gfs2_glock_nq(&i_gh); 1819 if (error) { 1820 gfs2_holder_uninit(&i_gh); 1821 return ERR_PTR(error); 1822 } 1823 1824 size = (unsigned int)i_size_read(&ip->i_inode); 1825 if (size == 0) { 1826 gfs2_consist_inode(ip); 1827 buf = ERR_PTR(-EIO); 1828 goto out; 1829 } 1830 1831 error = gfs2_meta_inode_buffer(ip, &dibh); 1832 if (error) { 1833 buf = ERR_PTR(error); 1834 goto out; 1835 } 1836 1837 buf = kzalloc(size + 1, GFP_NOFS); 1838 if (!buf) 1839 buf = ERR_PTR(-ENOMEM); 1840 else 1841 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1842 brelse(dibh); 1843 out: 1844 gfs2_glock_dq_uninit(&i_gh); 1845 if (!IS_ERR(buf)) 1846 set_delayed_call(done, kfree_link, buf); 1847 return buf; 1848 } 1849 1850 /** 1851 * gfs2_permission 1852 * @idmap: idmap of the mount the inode was found from 1853 * @inode: The inode 1854 * @mask: The mask to be tested 1855 * 1856 * This may be called from the VFS directly, or from within GFS2 with the 1857 * inode locked, so we look to see if the glock is already locked and only 1858 * lock the glock if its not already been done. 1859 * 1860 * Returns: errno 1861 */ 1862 1863 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode, 1864 int mask) 1865 { 1866 struct gfs2_inode *ip; 1867 struct gfs2_holder i_gh; 1868 int error; 1869 1870 gfs2_holder_mark_uninitialized(&i_gh); 1871 ip = GFS2_I(inode); 1872 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1873 if (mask & MAY_NOT_BLOCK) 1874 return -ECHILD; 1875 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1876 if (error) 1877 return error; 1878 } 1879 1880 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1881 error = -EPERM; 1882 else 1883 error = generic_permission(&nop_mnt_idmap, inode, mask); 1884 if (gfs2_holder_initialized(&i_gh)) 1885 gfs2_glock_dq_uninit(&i_gh); 1886 1887 return error; 1888 } 1889 1890 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1891 { 1892 setattr_copy(&nop_mnt_idmap, inode, attr); 1893 mark_inode_dirty(inode); 1894 return 0; 1895 } 1896 1897 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1898 { 1899 int error; 1900 1901 if (current->journal_info) 1902 return __gfs2_setattr_simple(inode, attr); 1903 1904 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1905 if (error) 1906 return error; 1907 1908 error = __gfs2_setattr_simple(inode, attr); 1909 gfs2_trans_end(GFS2_SB(inode)); 1910 return error; 1911 } 1912 1913 static int setattr_chown(struct inode *inode, struct iattr *attr) 1914 { 1915 struct gfs2_inode *ip = GFS2_I(inode); 1916 struct gfs2_sbd *sdp = GFS2_SB(inode); 1917 kuid_t ouid, nuid; 1918 kgid_t ogid, ngid; 1919 int error; 1920 struct gfs2_alloc_parms ap; 1921 1922 ouid = inode->i_uid; 1923 ogid = inode->i_gid; 1924 nuid = attr->ia_uid; 1925 ngid = attr->ia_gid; 1926 1927 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1928 ouid = nuid = NO_UID_QUOTA_CHANGE; 1929 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1930 ogid = ngid = NO_GID_QUOTA_CHANGE; 1931 error = gfs2_qa_get(ip); 1932 if (error) 1933 return error; 1934 1935 error = gfs2_rindex_update(sdp); 1936 if (error) 1937 goto out; 1938 1939 error = gfs2_quota_lock(ip, nuid, ngid); 1940 if (error) 1941 goto out; 1942 1943 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1944 1945 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1946 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1947 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1948 if (error) 1949 goto out_gunlock_q; 1950 } 1951 1952 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1953 if (error) 1954 goto out_gunlock_q; 1955 1956 error = gfs2_setattr_simple(inode, attr); 1957 if (error) 1958 goto out_end_trans; 1959 1960 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1961 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1962 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1963 gfs2_quota_change(ip, ap.target, nuid, ngid); 1964 } 1965 1966 out_end_trans: 1967 gfs2_trans_end(sdp); 1968 out_gunlock_q: 1969 gfs2_quota_unlock(ip); 1970 out: 1971 gfs2_qa_put(ip); 1972 return error; 1973 } 1974 1975 /** 1976 * gfs2_setattr - Change attributes on an inode 1977 * @idmap: idmap of the mount the inode was found from 1978 * @dentry: The dentry which is changing 1979 * @attr: The structure describing the change 1980 * 1981 * The VFS layer wants to change one or more of an inodes attributes. Write 1982 * that change out to disk. 1983 * 1984 * Returns: errno 1985 */ 1986 1987 static int gfs2_setattr(struct mnt_idmap *idmap, 1988 struct dentry *dentry, struct iattr *attr) 1989 { 1990 struct inode *inode = d_inode(dentry); 1991 struct gfs2_inode *ip = GFS2_I(inode); 1992 struct gfs2_holder i_gh; 1993 int error; 1994 1995 error = gfs2_qa_get(ip); 1996 if (error) 1997 return error; 1998 1999 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 2000 if (error) 2001 goto out; 2002 2003 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid); 2004 if (error) 2005 goto error; 2006 2007 error = setattr_prepare(&nop_mnt_idmap, dentry, attr); 2008 if (error) 2009 goto error; 2010 2011 if (attr->ia_valid & ATTR_SIZE) 2012 error = gfs2_setattr_size(inode, attr->ia_size); 2013 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2014 error = setattr_chown(inode, attr); 2015 else { 2016 error = gfs2_setattr_simple(inode, attr); 2017 if (!error && attr->ia_valid & ATTR_MODE) 2018 error = posix_acl_chmod(&nop_mnt_idmap, dentry, 2019 inode->i_mode); 2020 } 2021 2022 error: 2023 if (!error) 2024 mark_inode_dirty(inode); 2025 gfs2_glock_dq_uninit(&i_gh); 2026 out: 2027 gfs2_qa_put(ip); 2028 return error; 2029 } 2030 2031 /** 2032 * gfs2_getattr - Read out an inode's attributes 2033 * @idmap: idmap of the mount the inode was found from 2034 * @path: Object to query 2035 * @stat: The inode's stats 2036 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2037 * @flags: AT_STATX_xxx setting 2038 * 2039 * This may be called from the VFS directly, or from within GFS2 with the 2040 * inode locked, so we look to see if the glock is already locked and only 2041 * lock the glock if its not already been done. Note that its the NFS 2042 * readdirplus operation which causes this to be called (from filldir) 2043 * with the glock already held. 2044 * 2045 * Returns: errno 2046 */ 2047 2048 static int gfs2_getattr(struct mnt_idmap *idmap, 2049 const struct path *path, struct kstat *stat, 2050 u32 request_mask, unsigned int flags) 2051 { 2052 struct inode *inode = d_inode(path->dentry); 2053 struct gfs2_inode *ip = GFS2_I(inode); 2054 struct gfs2_holder gh; 2055 u32 gfsflags; 2056 int error; 2057 2058 gfs2_holder_mark_uninitialized(&gh); 2059 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2060 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2061 if (error) 2062 return error; 2063 } 2064 2065 gfsflags = ip->i_diskflags; 2066 if (gfsflags & GFS2_DIF_APPENDONLY) 2067 stat->attributes |= STATX_ATTR_APPEND; 2068 if (gfsflags & GFS2_DIF_IMMUTABLE) 2069 stat->attributes |= STATX_ATTR_IMMUTABLE; 2070 2071 stat->attributes_mask |= (STATX_ATTR_APPEND | 2072 STATX_ATTR_COMPRESSED | 2073 STATX_ATTR_ENCRYPTED | 2074 STATX_ATTR_IMMUTABLE | 2075 STATX_ATTR_NODUMP); 2076 2077 generic_fillattr(&nop_mnt_idmap, inode, stat); 2078 2079 if (gfs2_holder_initialized(&gh)) 2080 gfs2_glock_dq_uninit(&gh); 2081 2082 return 0; 2083 } 2084 2085 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2086 u64 start, u64 len) 2087 { 2088 struct gfs2_inode *ip = GFS2_I(inode); 2089 struct gfs2_holder gh; 2090 int ret; 2091 2092 inode_lock_shared(inode); 2093 2094 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2095 if (ret) 2096 goto out; 2097 2098 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2099 2100 gfs2_glock_dq_uninit(&gh); 2101 2102 out: 2103 inode_unlock_shared(inode); 2104 return ret; 2105 } 2106 2107 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2108 { 2109 struct inode *inode = file->f_mapping->host; 2110 struct gfs2_inode *ip = GFS2_I(inode); 2111 struct gfs2_holder gh; 2112 loff_t ret; 2113 2114 inode_lock_shared(inode); 2115 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2116 if (!ret) 2117 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2118 gfs2_glock_dq_uninit(&gh); 2119 inode_unlock_shared(inode); 2120 2121 if (ret < 0) 2122 return ret; 2123 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2124 } 2125 2126 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2127 { 2128 struct inode *inode = file->f_mapping->host; 2129 struct gfs2_inode *ip = GFS2_I(inode); 2130 struct gfs2_holder gh; 2131 loff_t ret; 2132 2133 inode_lock_shared(inode); 2134 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2135 if (!ret) 2136 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2137 gfs2_glock_dq_uninit(&gh); 2138 inode_unlock_shared(inode); 2139 2140 if (ret < 0) 2141 return ret; 2142 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2143 } 2144 2145 static int gfs2_update_time(struct inode *inode, struct timespec64 *time, 2146 int flags) 2147 { 2148 struct gfs2_inode *ip = GFS2_I(inode); 2149 struct gfs2_glock *gl = ip->i_gl; 2150 struct gfs2_holder *gh; 2151 int error; 2152 2153 gh = gfs2_glock_is_locked_by_me(gl); 2154 if (gh && !gfs2_glock_is_held_excl(gl)) { 2155 gfs2_glock_dq(gh); 2156 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2157 error = gfs2_glock_nq(gh); 2158 if (error) 2159 return error; 2160 } 2161 return generic_update_time(inode, time, flags); 2162 } 2163 2164 static const struct inode_operations gfs2_file_iops = { 2165 .permission = gfs2_permission, 2166 .setattr = gfs2_setattr, 2167 .getattr = gfs2_getattr, 2168 .listxattr = gfs2_listxattr, 2169 .fiemap = gfs2_fiemap, 2170 .get_inode_acl = gfs2_get_acl, 2171 .set_acl = gfs2_set_acl, 2172 .update_time = gfs2_update_time, 2173 .fileattr_get = gfs2_fileattr_get, 2174 .fileattr_set = gfs2_fileattr_set, 2175 }; 2176 2177 static const struct inode_operations gfs2_dir_iops = { 2178 .create = gfs2_create, 2179 .lookup = gfs2_lookup, 2180 .link = gfs2_link, 2181 .unlink = gfs2_unlink, 2182 .symlink = gfs2_symlink, 2183 .mkdir = gfs2_mkdir, 2184 .rmdir = gfs2_unlink, 2185 .mknod = gfs2_mknod, 2186 .rename = gfs2_rename2, 2187 .permission = gfs2_permission, 2188 .setattr = gfs2_setattr, 2189 .getattr = gfs2_getattr, 2190 .listxattr = gfs2_listxattr, 2191 .fiemap = gfs2_fiemap, 2192 .get_inode_acl = gfs2_get_acl, 2193 .set_acl = gfs2_set_acl, 2194 .update_time = gfs2_update_time, 2195 .atomic_open = gfs2_atomic_open, 2196 .fileattr_get = gfs2_fileattr_get, 2197 .fileattr_set = gfs2_fileattr_set, 2198 }; 2199 2200 static const struct inode_operations gfs2_symlink_iops = { 2201 .get_link = gfs2_get_link, 2202 .permission = gfs2_permission, 2203 .setattr = gfs2_setattr, 2204 .getattr = gfs2_getattr, 2205 .listxattr = gfs2_listxattr, 2206 .fiemap = gfs2_fiemap, 2207 }; 2208 2209