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 /** 269 * gfs2_lookup_meta - Look up an inode in a metadata directory 270 * @dip: The directory 271 * @name: The name of the inode 272 */ 273 struct inode *gfs2_lookup_meta(struct inode *dip, const char *name) 274 { 275 struct qstr qstr; 276 struct inode *inode; 277 278 gfs2_str2qstr(&qstr, name); 279 inode = gfs2_lookupi(dip, &qstr, 1); 280 if (IS_ERR_OR_NULL(inode)) 281 return inode ? inode : ERR_PTR(-ENOENT); 282 283 /* 284 * Must not call back into the filesystem when allocating 285 * pages in the metadata inode's address space. 286 */ 287 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 288 289 return inode; 290 } 291 292 293 /** 294 * gfs2_lookupi - Look up a filename in a directory and return its inode 295 * @dir: The inode of the directory containing the inode to look-up 296 * @name: The name of the inode to look for 297 * @is_root: If 1, ignore the caller's permissions 298 * 299 * This can be called via the VFS filldir function when NFS is doing 300 * a readdirplus and the inode which its intending to stat isn't 301 * already in cache. In this case we must not take the directory glock 302 * again, since the readdir call will have already taken that lock. 303 * 304 * Returns: errno 305 */ 306 307 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 308 int is_root) 309 { 310 struct super_block *sb = dir->i_sb; 311 struct gfs2_inode *dip = GFS2_I(dir); 312 struct gfs2_holder d_gh; 313 int error = 0; 314 struct inode *inode = NULL; 315 316 gfs2_holder_mark_uninitialized(&d_gh); 317 if (!name->len || name->len > GFS2_FNAMESIZE) 318 return ERR_PTR(-ENAMETOOLONG); 319 320 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 321 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 322 dir == d_inode(sb->s_root))) { 323 igrab(dir); 324 return dir; 325 } 326 327 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 328 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 329 if (error) 330 return ERR_PTR(error); 331 } 332 333 if (!is_root) { 334 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC); 335 if (error) 336 goto out; 337 } 338 339 inode = gfs2_dir_search(dir, name, false); 340 if (IS_ERR(inode)) 341 error = PTR_ERR(inode); 342 out: 343 if (gfs2_holder_initialized(&d_gh)) 344 gfs2_glock_dq_uninit(&d_gh); 345 if (error == -ENOENT) 346 return NULL; 347 return inode ? inode : ERR_PTR(error); 348 } 349 350 /** 351 * create_ok - OK to create a new on-disk inode here? 352 * @dip: Directory in which dinode is to be created 353 * @name: Name of new dinode 354 * @mode: 355 * 356 * Returns: errno 357 */ 358 359 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 360 umode_t mode) 361 { 362 int error; 363 364 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 365 MAY_WRITE | MAY_EXEC); 366 if (error) 367 return error; 368 369 /* Don't create entries in an unlinked directory */ 370 if (!dip->i_inode.i_nlink) 371 return -ENOENT; 372 373 if (dip->i_entries == (u32)-1) 374 return -EFBIG; 375 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 376 return -EMLINK; 377 378 return 0; 379 } 380 381 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 382 struct inode *inode) 383 { 384 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 385 (dip->i_inode.i_mode & S_ISUID) && 386 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 387 if (S_ISDIR(inode->i_mode)) 388 inode->i_mode |= S_ISUID; 389 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 390 inode->i_mode &= ~07111; 391 inode->i_uid = dip->i_inode.i_uid; 392 } else 393 inode->i_uid = current_fsuid(); 394 395 if (dip->i_inode.i_mode & S_ISGID) { 396 if (S_ISDIR(inode->i_mode)) 397 inode->i_mode |= S_ISGID; 398 inode->i_gid = dip->i_inode.i_gid; 399 } else 400 inode->i_gid = current_fsgid(); 401 } 402 403 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 404 { 405 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 406 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 407 int error; 408 409 error = gfs2_quota_lock_check(ip, &ap); 410 if (error) 411 goto out; 412 413 error = gfs2_inplace_reserve(ip, &ap); 414 if (error) 415 goto out_quota; 416 417 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 418 if (error) 419 goto out_ipreserv; 420 421 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1); 422 if (error) 423 goto out_trans_end; 424 425 ip->i_no_formal_ino = ip->i_generation; 426 ip->i_inode.i_ino = ip->i_no_addr; 427 ip->i_goal = ip->i_no_addr; 428 if (*dblocks > 1) 429 ip->i_eattr = ip->i_no_addr + 1; 430 431 out_trans_end: 432 gfs2_trans_end(sdp); 433 out_ipreserv: 434 gfs2_inplace_release(ip); 435 out_quota: 436 gfs2_quota_unlock(ip); 437 out: 438 return error; 439 } 440 441 static void gfs2_init_dir(struct buffer_head *dibh, 442 const struct gfs2_inode *parent) 443 { 444 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 445 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 446 447 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 448 dent->de_inum = di->di_num; /* already GFS2 endian */ 449 dent->de_type = cpu_to_be16(DT_DIR); 450 451 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 452 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 453 gfs2_inum_out(parent, dent); 454 dent->de_type = cpu_to_be16(DT_DIR); 455 456 } 457 458 /** 459 * gfs2_init_xattr - Initialise an xattr block for a new inode 460 * @ip: The inode in question 461 * 462 * This sets up an empty xattr block for a new inode, ready to 463 * take any ACLs, LSM xattrs, etc. 464 */ 465 466 static void gfs2_init_xattr(struct gfs2_inode *ip) 467 { 468 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 469 struct buffer_head *bh; 470 struct gfs2_ea_header *ea; 471 472 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 473 gfs2_trans_add_meta(ip->i_gl, bh); 474 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 475 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 476 477 ea = GFS2_EA_BH2FIRST(bh); 478 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 479 ea->ea_type = GFS2_EATYPE_UNUSED; 480 ea->ea_flags = GFS2_EAFLAG_LAST; 481 482 brelse(bh); 483 } 484 485 /** 486 * init_dinode - Fill in a new dinode structure 487 * @dip: The directory this inode is being created in 488 * @ip: The inode 489 * @symname: The symlink destination (if a symlink) 490 * 491 */ 492 493 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 494 const char *symname) 495 { 496 struct gfs2_dinode *di; 497 struct buffer_head *dibh; 498 499 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 500 gfs2_trans_add_meta(ip->i_gl, dibh); 501 di = (struct gfs2_dinode *)dibh->b_data; 502 gfs2_dinode_out(ip, di); 503 504 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 505 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 506 di->__pad1 = 0; 507 di->__pad2 = 0; 508 di->__pad3 = 0; 509 memset(&di->__pad4, 0, sizeof(di->__pad4)); 510 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 511 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 512 513 switch(ip->i_inode.i_mode & S_IFMT) { 514 case S_IFDIR: 515 gfs2_init_dir(dibh, dip); 516 break; 517 case S_IFLNK: 518 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 519 break; 520 } 521 522 set_buffer_uptodate(dibh); 523 brelse(dibh); 524 } 525 526 /** 527 * gfs2_trans_da_blks - Calculate number of blocks to link inode 528 * @dip: The directory we are linking into 529 * @da: The dir add information 530 * @nr_inodes: The number of inodes involved 531 * 532 * This calculate the number of blocks we need to reserve in a 533 * transaction to link @nr_inodes into a directory. In most cases 534 * @nr_inodes will be 2 (the directory plus the inode being linked in) 535 * but in case of rename, 4 may be required. 536 * 537 * Returns: Number of blocks 538 */ 539 540 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 541 const struct gfs2_diradd *da, 542 unsigned nr_inodes) 543 { 544 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 545 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 546 } 547 548 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 549 struct gfs2_inode *ip, struct gfs2_diradd *da) 550 { 551 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 552 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 553 int error; 554 555 if (da->nr_blocks) { 556 error = gfs2_quota_lock_check(dip, &ap); 557 if (error) 558 goto fail_quota_locks; 559 560 error = gfs2_inplace_reserve(dip, &ap); 561 if (error) 562 goto fail_quota_locks; 563 564 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 565 if (error) 566 goto fail_ipreserv; 567 } else { 568 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 569 if (error) 570 goto fail_quota_locks; 571 } 572 573 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 574 575 gfs2_trans_end(sdp); 576 fail_ipreserv: 577 gfs2_inplace_release(dip); 578 fail_quota_locks: 579 gfs2_quota_unlock(dip); 580 return error; 581 } 582 583 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 584 void *fs_info) 585 { 586 const struct xattr *xattr; 587 int err = 0; 588 589 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 590 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 591 xattr->value_len, 0, 592 GFS2_EATYPE_SECURITY); 593 if (err < 0) 594 break; 595 } 596 return err; 597 } 598 599 /** 600 * gfs2_create_inode - Create a new inode 601 * @dir: The parent directory 602 * @dentry: The new dentry 603 * @file: If non-NULL, the file which is being opened 604 * @mode: The permissions on the new inode 605 * @dev: For device nodes, this is the device number 606 * @symname: For symlinks, this is the link destination 607 * @size: The initial size of the inode (ignored for directories) 608 * @excl: Force fail if inode exists 609 * 610 * FIXME: Change to allocate the disk blocks and write them out in the same 611 * transaction. That way, we can no longer end up in a situation in which an 612 * inode is allocated, the node crashes, and the block looks like a valid 613 * inode. (With atomic creates in place, we will also no longer need to zero 614 * the link count and dirty the inode here on failure.) 615 * 616 * Returns: 0 on success, or error code 617 */ 618 619 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 620 struct file *file, 621 umode_t mode, dev_t dev, const char *symname, 622 unsigned int size, int excl) 623 { 624 const struct qstr *name = &dentry->d_name; 625 struct posix_acl *default_acl, *acl; 626 struct gfs2_holder d_gh, gh; 627 struct inode *inode = NULL; 628 struct gfs2_inode *dip = GFS2_I(dir), *ip; 629 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 630 struct gfs2_glock *io_gl; 631 int error; 632 u32 aflags = 0; 633 unsigned blocks = 1; 634 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 635 636 if (!name->len || name->len > GFS2_FNAMESIZE) 637 return -ENAMETOOLONG; 638 639 error = gfs2_qa_get(dip); 640 if (error) 641 return error; 642 643 error = gfs2_rindex_update(sdp); 644 if (error) 645 goto fail; 646 647 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 648 if (error) 649 goto fail; 650 gfs2_holder_mark_uninitialized(&gh); 651 652 error = create_ok(dip, name, mode); 653 if (error) 654 goto fail_gunlock; 655 656 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 657 error = PTR_ERR(inode); 658 if (!IS_ERR(inode)) { 659 if (S_ISDIR(inode->i_mode)) { 660 iput(inode); 661 inode = ERR_PTR(-EISDIR); 662 goto fail_gunlock; 663 } 664 d_instantiate(dentry, inode); 665 error = 0; 666 if (file) { 667 if (S_ISREG(inode->i_mode)) 668 error = finish_open(file, dentry, gfs2_open_common); 669 else 670 error = finish_no_open(file, NULL); 671 } 672 gfs2_glock_dq_uninit(&d_gh); 673 goto fail; 674 } else if (error != -ENOENT) { 675 goto fail_gunlock; 676 } 677 678 error = gfs2_diradd_alloc_required(dir, name, &da); 679 if (error < 0) 680 goto fail_gunlock; 681 682 inode = new_inode(sdp->sd_vfs); 683 error = -ENOMEM; 684 if (!inode) 685 goto fail_gunlock; 686 ip = GFS2_I(inode); 687 688 error = posix_acl_create(dir, &mode, &default_acl, &acl); 689 if (error) 690 goto fail_gunlock; 691 692 error = gfs2_qa_get(ip); 693 if (error) 694 goto fail_free_acls; 695 696 inode->i_mode = mode; 697 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 698 inode->i_rdev = dev; 699 inode->i_size = size; 700 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); 701 munge_mode_uid_gid(dip, inode); 702 check_and_update_goal(dip); 703 ip->i_goal = dip->i_goal; 704 ip->i_diskflags = 0; 705 ip->i_eattr = 0; 706 ip->i_height = 0; 707 ip->i_depth = 0; 708 ip->i_entries = 0; 709 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 710 711 switch(mode & S_IFMT) { 712 case S_IFREG: 713 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 714 gfs2_tune_get(sdp, gt_new_files_jdata)) 715 ip->i_diskflags |= GFS2_DIF_JDATA; 716 gfs2_set_aops(inode); 717 break; 718 case S_IFDIR: 719 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 720 ip->i_diskflags |= GFS2_DIF_JDATA; 721 ip->i_entries = 2; 722 break; 723 } 724 725 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 726 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 727 ip->i_diskflags |= GFS2_DIF_SYSTEM; 728 729 gfs2_set_inode_flags(inode); 730 731 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 732 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 733 aflags |= GFS2_AF_ORLOV; 734 735 if (default_acl || acl) 736 blocks++; 737 738 error = alloc_dinode(ip, aflags, &blocks); 739 if (error) 740 goto fail_free_inode; 741 742 gfs2_set_inode_blocks(inode, blocks); 743 744 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 745 if (error) 746 goto fail_free_inode; 747 748 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 749 if (error) 750 goto fail_free_inode; 751 gfs2_cancel_delete_work(io_gl); 752 753 retry: 754 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); 755 if (error == -EBUSY) 756 goto retry; 757 if (error) 758 goto fail_gunlock2; 759 760 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID, 761 &ip->i_iopen_gh); 762 if (error) 763 goto fail_gunlock2; 764 765 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 766 if (error) 767 goto fail_gunlock3; 768 769 error = gfs2_trans_begin(sdp, blocks, 0); 770 if (error) 771 goto fail_gunlock3; 772 773 if (blocks > 1) 774 gfs2_init_xattr(ip); 775 init_dinode(dip, ip, symname); 776 gfs2_trans_end(sdp); 777 778 glock_set_object(ip->i_gl, ip); 779 glock_set_object(io_gl, ip); 780 gfs2_set_iop(inode); 781 782 if (default_acl) { 783 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 784 if (error) 785 goto fail_gunlock4; 786 posix_acl_release(default_acl); 787 default_acl = NULL; 788 } 789 if (acl) { 790 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 791 if (error) 792 goto fail_gunlock4; 793 posix_acl_release(acl); 794 acl = NULL; 795 } 796 797 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 798 &gfs2_initxattrs, NULL); 799 if (error) 800 goto fail_gunlock4; 801 802 error = link_dinode(dip, name, ip, &da); 803 if (error) 804 goto fail_gunlock4; 805 806 mark_inode_dirty(inode); 807 d_instantiate(dentry, inode); 808 /* After instantiate, errors should result in evict which will destroy 809 * both inode and iopen glocks properly. */ 810 if (file) { 811 file->f_mode |= FMODE_CREATED; 812 error = finish_open(file, dentry, gfs2_open_common); 813 } 814 gfs2_glock_dq_uninit(&d_gh); 815 gfs2_qa_put(ip); 816 gfs2_glock_dq_uninit(&gh); 817 gfs2_glock_put(io_gl); 818 gfs2_qa_put(dip); 819 unlock_new_inode(inode); 820 return error; 821 822 fail_gunlock4: 823 glock_clear_object(ip->i_gl, ip); 824 glock_clear_object(io_gl, ip); 825 fail_gunlock3: 826 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 827 fail_gunlock2: 828 gfs2_glock_put(io_gl); 829 fail_free_inode: 830 if (ip->i_gl) { 831 gfs2_glock_put(ip->i_gl); 832 ip->i_gl = NULL; 833 } 834 gfs2_rs_deltree(&ip->i_res); 835 gfs2_qa_put(ip); 836 fail_free_acls: 837 posix_acl_release(default_acl); 838 posix_acl_release(acl); 839 fail_gunlock: 840 gfs2_dir_no_add(&da); 841 gfs2_glock_dq_uninit(&d_gh); 842 if (!IS_ERR_OR_NULL(inode)) { 843 set_bit(GIF_ALLOC_FAILED, &ip->i_flags); 844 clear_nlink(inode); 845 if (ip->i_no_addr) 846 mark_inode_dirty(inode); 847 if (inode->i_state & I_NEW) 848 iget_failed(inode); 849 else 850 iput(inode); 851 } 852 if (gfs2_holder_initialized(&gh)) 853 gfs2_glock_dq_uninit(&gh); 854 fail: 855 gfs2_qa_put(dip); 856 return error; 857 } 858 859 /** 860 * gfs2_create - Create a file 861 * @idmap: idmap of the mount the inode was found from 862 * @dir: The directory in which to create the file 863 * @dentry: The dentry of the new file 864 * @mode: The mode of the new file 865 * @excl: Force fail if inode exists 866 * 867 * Returns: errno 868 */ 869 870 static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir, 871 struct dentry *dentry, umode_t mode, bool excl) 872 { 873 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 874 } 875 876 /** 877 * __gfs2_lookup - Look up a filename in a directory and return its inode 878 * @dir: The directory inode 879 * @dentry: The dentry of the new inode 880 * @file: File to be opened 881 * 882 * 883 * Returns: errno 884 */ 885 886 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 887 struct file *file) 888 { 889 struct inode *inode; 890 struct dentry *d; 891 struct gfs2_holder gh; 892 struct gfs2_glock *gl; 893 int error; 894 895 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 896 if (inode == NULL) { 897 d_add(dentry, NULL); 898 return NULL; 899 } 900 if (IS_ERR(inode)) 901 return ERR_CAST(inode); 902 903 gl = GFS2_I(inode)->i_gl; 904 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 905 if (error) { 906 iput(inode); 907 return ERR_PTR(error); 908 } 909 910 d = d_splice_alias(inode, dentry); 911 if (IS_ERR(d)) { 912 gfs2_glock_dq_uninit(&gh); 913 return d; 914 } 915 if (file && S_ISREG(inode->i_mode)) 916 error = finish_open(file, dentry, gfs2_open_common); 917 918 gfs2_glock_dq_uninit(&gh); 919 if (error) { 920 dput(d); 921 return ERR_PTR(error); 922 } 923 return d; 924 } 925 926 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 927 unsigned flags) 928 { 929 return __gfs2_lookup(dir, dentry, NULL); 930 } 931 932 /** 933 * gfs2_link - Link to a file 934 * @old_dentry: The inode to link 935 * @dir: Add link to this directory 936 * @dentry: The name of the link 937 * 938 * Link the inode in "old_dentry" into the directory "dir" with the 939 * name in "dentry". 940 * 941 * Returns: errno 942 */ 943 944 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 945 struct dentry *dentry) 946 { 947 struct gfs2_inode *dip = GFS2_I(dir); 948 struct gfs2_sbd *sdp = GFS2_SB(dir); 949 struct inode *inode = d_inode(old_dentry); 950 struct gfs2_inode *ip = GFS2_I(inode); 951 struct gfs2_holder d_gh, gh; 952 struct buffer_head *dibh; 953 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 954 int error; 955 956 if (S_ISDIR(inode->i_mode)) 957 return -EPERM; 958 959 error = gfs2_qa_get(dip); 960 if (error) 961 return error; 962 963 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 964 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 965 966 error = gfs2_glock_nq(&d_gh); 967 if (error) 968 goto out_parent; 969 970 error = gfs2_glock_nq(&gh); 971 if (error) 972 goto out_child; 973 974 error = -ENOENT; 975 if (inode->i_nlink == 0) 976 goto out_gunlock; 977 978 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC); 979 if (error) 980 goto out_gunlock; 981 982 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 983 switch (error) { 984 case -ENOENT: 985 break; 986 case 0: 987 error = -EEXIST; 988 goto out_gunlock; 989 default: 990 goto out_gunlock; 991 } 992 993 error = -EINVAL; 994 if (!dip->i_inode.i_nlink) 995 goto out_gunlock; 996 error = -EFBIG; 997 if (dip->i_entries == (u32)-1) 998 goto out_gunlock; 999 error = -EPERM; 1000 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1001 goto out_gunlock; 1002 error = -EMLINK; 1003 if (ip->i_inode.i_nlink == (u32)-1) 1004 goto out_gunlock; 1005 1006 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 1007 if (error < 0) 1008 goto out_gunlock; 1009 1010 if (da.nr_blocks) { 1011 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1012 error = gfs2_quota_lock_check(dip, &ap); 1013 if (error) 1014 goto out_gunlock; 1015 1016 error = gfs2_inplace_reserve(dip, &ap); 1017 if (error) 1018 goto out_gunlock_q; 1019 1020 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1021 if (error) 1022 goto out_ipres; 1023 } else { 1024 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1025 if (error) 1026 goto out_ipres; 1027 } 1028 1029 error = gfs2_meta_inode_buffer(ip, &dibh); 1030 if (error) 1031 goto out_end_trans; 1032 1033 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1034 if (error) 1035 goto out_brelse; 1036 1037 gfs2_trans_add_meta(ip->i_gl, dibh); 1038 inc_nlink(&ip->i_inode); 1039 inode_set_ctime_current(&ip->i_inode); 1040 ihold(inode); 1041 d_instantiate(dentry, inode); 1042 mark_inode_dirty(inode); 1043 1044 out_brelse: 1045 brelse(dibh); 1046 out_end_trans: 1047 gfs2_trans_end(sdp); 1048 out_ipres: 1049 if (da.nr_blocks) 1050 gfs2_inplace_release(dip); 1051 out_gunlock_q: 1052 if (da.nr_blocks) 1053 gfs2_quota_unlock(dip); 1054 out_gunlock: 1055 gfs2_dir_no_add(&da); 1056 gfs2_glock_dq(&gh); 1057 out_child: 1058 gfs2_glock_dq(&d_gh); 1059 out_parent: 1060 gfs2_qa_put(dip); 1061 gfs2_holder_uninit(&d_gh); 1062 gfs2_holder_uninit(&gh); 1063 return error; 1064 } 1065 1066 /* 1067 * gfs2_unlink_ok - check to see that a inode is still in a directory 1068 * @dip: the directory 1069 * @name: the name of the file 1070 * @ip: the inode 1071 * 1072 * Assumes that the lock on (at least) @dip is held. 1073 * 1074 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1075 */ 1076 1077 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1078 const struct gfs2_inode *ip) 1079 { 1080 int error; 1081 1082 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1083 return -EPERM; 1084 1085 if ((dip->i_inode.i_mode & S_ISVTX) && 1086 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1087 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1088 return -EPERM; 1089 1090 if (IS_APPEND(&dip->i_inode)) 1091 return -EPERM; 1092 1093 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 1094 MAY_WRITE | MAY_EXEC); 1095 if (error) 1096 return error; 1097 1098 return gfs2_dir_check(&dip->i_inode, name, ip); 1099 } 1100 1101 /** 1102 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1103 * @dip: The parent directory 1104 * @dentry: The dentry to unlink 1105 * 1106 * Called with all the locks and in a transaction. This will only be 1107 * called for a directory after it has been checked to ensure it is empty. 1108 * 1109 * Returns: 0 on success, or an error 1110 */ 1111 1112 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1113 const struct dentry *dentry) 1114 { 1115 struct inode *inode = d_inode(dentry); 1116 struct gfs2_inode *ip = GFS2_I(inode); 1117 int error; 1118 1119 error = gfs2_dir_del(dip, dentry); 1120 if (error) 1121 return error; 1122 1123 ip->i_entries = 0; 1124 inode_set_ctime_current(inode); 1125 if (S_ISDIR(inode->i_mode)) 1126 clear_nlink(inode); 1127 else 1128 drop_nlink(inode); 1129 mark_inode_dirty(inode); 1130 if (inode->i_nlink == 0) 1131 gfs2_unlink_di(inode); 1132 return 0; 1133 } 1134 1135 1136 /** 1137 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1138 * @dir: The inode of the directory containing the inode to unlink 1139 * @dentry: The file itself 1140 * 1141 * This routine uses the type of the inode as a flag to figure out 1142 * whether this is an unlink or an rmdir. 1143 * 1144 * Returns: errno 1145 */ 1146 1147 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1148 { 1149 struct gfs2_inode *dip = GFS2_I(dir); 1150 struct gfs2_sbd *sdp = GFS2_SB(dir); 1151 struct inode *inode = d_inode(dentry); 1152 struct gfs2_inode *ip = GFS2_I(inode); 1153 struct gfs2_holder d_gh, r_gh, gh; 1154 struct gfs2_rgrpd *rgd; 1155 int error; 1156 1157 error = gfs2_rindex_update(sdp); 1158 if (error) 1159 return error; 1160 1161 error = -EROFS; 1162 1163 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1164 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1165 1166 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1167 if (!rgd) 1168 goto out_inodes; 1169 1170 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh); 1171 1172 1173 error = gfs2_glock_nq(&d_gh); 1174 if (error) 1175 goto out_parent; 1176 1177 error = gfs2_glock_nq(&gh); 1178 if (error) 1179 goto out_child; 1180 1181 error = -ENOENT; 1182 if (inode->i_nlink == 0) 1183 goto out_rgrp; 1184 1185 if (S_ISDIR(inode->i_mode)) { 1186 error = -ENOTEMPTY; 1187 if (ip->i_entries > 2 || inode->i_nlink > 2) 1188 goto out_rgrp; 1189 } 1190 1191 error = gfs2_glock_nq(&r_gh); /* rgrp */ 1192 if (error) 1193 goto out_rgrp; 1194 1195 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1196 if (error) 1197 goto out_gunlock; 1198 1199 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1200 if (error) 1201 goto out_gunlock; 1202 1203 error = gfs2_unlink_inode(dip, dentry); 1204 gfs2_trans_end(sdp); 1205 1206 out_gunlock: 1207 gfs2_glock_dq(&r_gh); 1208 out_rgrp: 1209 gfs2_glock_dq(&gh); 1210 out_child: 1211 gfs2_glock_dq(&d_gh); 1212 out_parent: 1213 gfs2_holder_uninit(&r_gh); 1214 out_inodes: 1215 gfs2_holder_uninit(&gh); 1216 gfs2_holder_uninit(&d_gh); 1217 return error; 1218 } 1219 1220 /** 1221 * gfs2_symlink - Create a symlink 1222 * @idmap: idmap of the mount the inode was found from 1223 * @dir: The directory to create the symlink in 1224 * @dentry: The dentry to put the symlink in 1225 * @symname: The thing which the link points to 1226 * 1227 * Returns: errno 1228 */ 1229 1230 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir, 1231 struct dentry *dentry, const char *symname) 1232 { 1233 unsigned int size; 1234 1235 size = strlen(symname); 1236 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1237 return -ENAMETOOLONG; 1238 1239 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1240 } 1241 1242 /** 1243 * gfs2_mkdir - Make a directory 1244 * @idmap: idmap of the mount the inode was found from 1245 * @dir: The parent directory of the new one 1246 * @dentry: The dentry of the new directory 1247 * @mode: The mode of the new directory 1248 * 1249 * Returns: errno 1250 */ 1251 1252 static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1253 struct dentry *dentry, umode_t mode) 1254 { 1255 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1256 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1257 } 1258 1259 /** 1260 * gfs2_mknod - Make a special file 1261 * @idmap: idmap of the mount the inode was found from 1262 * @dir: The directory in which the special file will reside 1263 * @dentry: The dentry of the special file 1264 * @mode: The mode of the special file 1265 * @dev: The device specification of the special file 1266 * 1267 */ 1268 1269 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir, 1270 struct dentry *dentry, umode_t mode, dev_t dev) 1271 { 1272 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1273 } 1274 1275 /** 1276 * gfs2_atomic_open - Atomically open a file 1277 * @dir: The directory 1278 * @dentry: The proposed new entry 1279 * @file: The proposed new struct file 1280 * @flags: open flags 1281 * @mode: File mode 1282 * 1283 * Returns: error code or 0 for success 1284 */ 1285 1286 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1287 struct file *file, unsigned flags, 1288 umode_t mode) 1289 { 1290 struct dentry *d; 1291 bool excl = !!(flags & O_EXCL); 1292 1293 if (!d_in_lookup(dentry)) 1294 goto skip_lookup; 1295 1296 d = __gfs2_lookup(dir, dentry, file); 1297 if (IS_ERR(d)) 1298 return PTR_ERR(d); 1299 if (d != NULL) 1300 dentry = d; 1301 if (d_really_is_positive(dentry)) { 1302 if (!(file->f_mode & FMODE_OPENED)) 1303 return finish_no_open(file, d); 1304 dput(d); 1305 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1306 } 1307 1308 BUG_ON(d != NULL); 1309 1310 skip_lookup: 1311 if (!(flags & O_CREAT)) 1312 return -ENOENT; 1313 1314 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1315 } 1316 1317 /* 1318 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1319 * @this: move this 1320 * @to: to here 1321 * 1322 * Follow @to back to the root and make sure we don't encounter @this 1323 * Assumes we already hold the rename lock. 1324 * 1325 * Returns: errno 1326 */ 1327 1328 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1329 { 1330 struct inode *dir = &to->i_inode; 1331 struct super_block *sb = dir->i_sb; 1332 struct inode *tmp; 1333 int error = 0; 1334 1335 igrab(dir); 1336 1337 for (;;) { 1338 if (dir == &this->i_inode) { 1339 error = -EINVAL; 1340 break; 1341 } 1342 if (dir == d_inode(sb->s_root)) { 1343 error = 0; 1344 break; 1345 } 1346 1347 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1348 if (!tmp) { 1349 error = -ENOENT; 1350 break; 1351 } 1352 if (IS_ERR(tmp)) { 1353 error = PTR_ERR(tmp); 1354 break; 1355 } 1356 1357 iput(dir); 1358 dir = tmp; 1359 } 1360 1361 iput(dir); 1362 1363 return error; 1364 } 1365 1366 /** 1367 * update_moved_ino - Update an inode that's being moved 1368 * @ip: The inode being moved 1369 * @ndip: The parent directory of the new filename 1370 * @dir_rename: True of ip is a directory 1371 * 1372 * Returns: errno 1373 */ 1374 1375 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1376 int dir_rename) 1377 { 1378 if (dir_rename) 1379 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1380 1381 inode_set_ctime_current(&ip->i_inode); 1382 mark_inode_dirty_sync(&ip->i_inode); 1383 return 0; 1384 } 1385 1386 1387 /** 1388 * gfs2_rename - Rename a file 1389 * @odir: Parent directory of old file name 1390 * @odentry: The old dentry of the file 1391 * @ndir: Parent directory of new file name 1392 * @ndentry: The new dentry of the file 1393 * 1394 * Returns: errno 1395 */ 1396 1397 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1398 struct inode *ndir, struct dentry *ndentry) 1399 { 1400 struct gfs2_inode *odip = GFS2_I(odir); 1401 struct gfs2_inode *ndip = GFS2_I(ndir); 1402 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1403 struct gfs2_inode *nip = NULL; 1404 struct gfs2_sbd *sdp = GFS2_SB(odir); 1405 struct gfs2_holder ghs[4], r_gh, rd_gh; 1406 struct gfs2_rgrpd *nrgd; 1407 unsigned int num_gh; 1408 int dir_rename = 0; 1409 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1410 unsigned int x; 1411 int error; 1412 1413 gfs2_holder_mark_uninitialized(&r_gh); 1414 gfs2_holder_mark_uninitialized(&rd_gh); 1415 if (d_really_is_positive(ndentry)) { 1416 nip = GFS2_I(d_inode(ndentry)); 1417 if (ip == nip) 1418 return 0; 1419 } 1420 1421 error = gfs2_rindex_update(sdp); 1422 if (error) 1423 return error; 1424 1425 error = gfs2_qa_get(ndip); 1426 if (error) 1427 return error; 1428 1429 if (odip != ndip) { 1430 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1431 0, &r_gh); 1432 if (error) 1433 goto out; 1434 1435 if (S_ISDIR(ip->i_inode.i_mode)) { 1436 dir_rename = 1; 1437 /* don't move a directory into its subdir */ 1438 error = gfs2_ok_to_move(ip, ndip); 1439 if (error) 1440 goto out_gunlock_r; 1441 } 1442 } 1443 1444 num_gh = 1; 1445 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1446 if (odip != ndip) { 1447 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1448 ghs + num_gh); 1449 num_gh++; 1450 } 1451 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1452 num_gh++; 1453 1454 if (nip) { 1455 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1456 ghs + num_gh); 1457 num_gh++; 1458 } 1459 1460 for (x = 0; x < num_gh; x++) { 1461 error = gfs2_glock_nq(ghs + x); 1462 if (error) 1463 goto out_gunlock; 1464 } 1465 error = gfs2_glock_async_wait(num_gh, ghs); 1466 if (error) 1467 goto out_gunlock; 1468 1469 if (nip) { 1470 /* Grab the resource group glock for unlink flag twiddling. 1471 * This is the case where the target dinode already exists 1472 * so we unlink before doing the rename. 1473 */ 1474 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1475 if (!nrgd) { 1476 error = -ENOENT; 1477 goto out_gunlock; 1478 } 1479 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1480 LM_FLAG_NODE_SCOPE, &rd_gh); 1481 if (error) 1482 goto out_gunlock; 1483 } 1484 1485 error = -ENOENT; 1486 if (ip->i_inode.i_nlink == 0) 1487 goto out_gunlock; 1488 1489 /* Check out the old directory */ 1490 1491 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1492 if (error) 1493 goto out_gunlock; 1494 1495 /* Check out the new directory */ 1496 1497 if (nip) { 1498 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1499 if (error) 1500 goto out_gunlock; 1501 1502 if (nip->i_inode.i_nlink == 0) { 1503 error = -EAGAIN; 1504 goto out_gunlock; 1505 } 1506 1507 if (S_ISDIR(nip->i_inode.i_mode)) { 1508 if (nip->i_entries < 2) { 1509 gfs2_consist_inode(nip); 1510 error = -EIO; 1511 goto out_gunlock; 1512 } 1513 if (nip->i_entries > 2) { 1514 error = -ENOTEMPTY; 1515 goto out_gunlock; 1516 } 1517 } 1518 } else { 1519 error = gfs2_permission(&nop_mnt_idmap, ndir, 1520 MAY_WRITE | MAY_EXEC); 1521 if (error) 1522 goto out_gunlock; 1523 1524 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1525 switch (error) { 1526 case -ENOENT: 1527 error = 0; 1528 break; 1529 case 0: 1530 error = -EEXIST; 1531 goto out_gunlock; 1532 default: 1533 goto out_gunlock; 1534 } 1535 1536 if (odip != ndip) { 1537 if (!ndip->i_inode.i_nlink) { 1538 error = -ENOENT; 1539 goto out_gunlock; 1540 } 1541 if (ndip->i_entries == (u32)-1) { 1542 error = -EFBIG; 1543 goto out_gunlock; 1544 } 1545 if (S_ISDIR(ip->i_inode.i_mode) && 1546 ndip->i_inode.i_nlink == (u32)-1) { 1547 error = -EMLINK; 1548 goto out_gunlock; 1549 } 1550 } 1551 } 1552 1553 /* Check out the dir to be renamed */ 1554 1555 if (dir_rename) { 1556 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry), 1557 MAY_WRITE); 1558 if (error) 1559 goto out_gunlock; 1560 } 1561 1562 if (nip == NULL) { 1563 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1564 if (error) 1565 goto out_gunlock; 1566 } 1567 1568 if (da.nr_blocks) { 1569 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1570 error = gfs2_quota_lock_check(ndip, &ap); 1571 if (error) 1572 goto out_gunlock; 1573 1574 error = gfs2_inplace_reserve(ndip, &ap); 1575 if (error) 1576 goto out_gunlock_q; 1577 1578 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1579 4 * RES_LEAF + 4, 0); 1580 if (error) 1581 goto out_ipreserv; 1582 } else { 1583 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1584 5 * RES_LEAF + 4, 0); 1585 if (error) 1586 goto out_gunlock; 1587 } 1588 1589 /* Remove the target file, if it exists */ 1590 1591 if (nip) 1592 error = gfs2_unlink_inode(ndip, ndentry); 1593 1594 error = update_moved_ino(ip, ndip, dir_rename); 1595 if (error) 1596 goto out_end_trans; 1597 1598 error = gfs2_dir_del(odip, odentry); 1599 if (error) 1600 goto out_end_trans; 1601 1602 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1603 if (error) 1604 goto out_end_trans; 1605 1606 out_end_trans: 1607 gfs2_trans_end(sdp); 1608 out_ipreserv: 1609 if (da.nr_blocks) 1610 gfs2_inplace_release(ndip); 1611 out_gunlock_q: 1612 if (da.nr_blocks) 1613 gfs2_quota_unlock(ndip); 1614 out_gunlock: 1615 gfs2_dir_no_add(&da); 1616 if (gfs2_holder_initialized(&rd_gh)) 1617 gfs2_glock_dq_uninit(&rd_gh); 1618 1619 while (x--) { 1620 if (gfs2_holder_queued(ghs + x)) 1621 gfs2_glock_dq(ghs + x); 1622 gfs2_holder_uninit(ghs + x); 1623 } 1624 out_gunlock_r: 1625 if (gfs2_holder_initialized(&r_gh)) 1626 gfs2_glock_dq_uninit(&r_gh); 1627 out: 1628 gfs2_qa_put(ndip); 1629 return error; 1630 } 1631 1632 /** 1633 * gfs2_exchange - exchange two files 1634 * @odir: Parent directory of old file name 1635 * @odentry: The old dentry of the file 1636 * @ndir: Parent directory of new file name 1637 * @ndentry: The new dentry of the file 1638 * @flags: The rename flags 1639 * 1640 * Returns: errno 1641 */ 1642 1643 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1644 struct inode *ndir, struct dentry *ndentry, 1645 unsigned int flags) 1646 { 1647 struct gfs2_inode *odip = GFS2_I(odir); 1648 struct gfs2_inode *ndip = GFS2_I(ndir); 1649 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1650 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1651 struct gfs2_sbd *sdp = GFS2_SB(odir); 1652 struct gfs2_holder ghs[4], r_gh; 1653 unsigned int num_gh; 1654 unsigned int x; 1655 umode_t old_mode = oip->i_inode.i_mode; 1656 umode_t new_mode = nip->i_inode.i_mode; 1657 int error; 1658 1659 gfs2_holder_mark_uninitialized(&r_gh); 1660 error = gfs2_rindex_update(sdp); 1661 if (error) 1662 return error; 1663 1664 if (odip != ndip) { 1665 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1666 0, &r_gh); 1667 if (error) 1668 goto out; 1669 1670 if (S_ISDIR(old_mode)) { 1671 /* don't move a directory into its subdir */ 1672 error = gfs2_ok_to_move(oip, ndip); 1673 if (error) 1674 goto out_gunlock_r; 1675 } 1676 1677 if (S_ISDIR(new_mode)) { 1678 /* don't move a directory into its subdir */ 1679 error = gfs2_ok_to_move(nip, odip); 1680 if (error) 1681 goto out_gunlock_r; 1682 } 1683 } 1684 1685 num_gh = 1; 1686 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1687 if (odip != ndip) { 1688 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1689 ghs + num_gh); 1690 num_gh++; 1691 } 1692 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1693 num_gh++; 1694 1695 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1696 num_gh++; 1697 1698 for (x = 0; x < num_gh; x++) { 1699 error = gfs2_glock_nq(ghs + x); 1700 if (error) 1701 goto out_gunlock; 1702 } 1703 1704 error = gfs2_glock_async_wait(num_gh, ghs); 1705 if (error) 1706 goto out_gunlock; 1707 1708 error = -ENOENT; 1709 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1710 goto out_gunlock; 1711 1712 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1713 if (error) 1714 goto out_gunlock; 1715 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1716 if (error) 1717 goto out_gunlock; 1718 1719 if (S_ISDIR(old_mode)) { 1720 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode, 1721 MAY_WRITE); 1722 if (error) 1723 goto out_gunlock; 1724 } 1725 if (S_ISDIR(new_mode)) { 1726 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode, 1727 MAY_WRITE); 1728 if (error) 1729 goto out_gunlock; 1730 } 1731 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1732 if (error) 1733 goto out_gunlock; 1734 1735 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1736 if (error) 1737 goto out_end_trans; 1738 1739 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1740 if (error) 1741 goto out_end_trans; 1742 1743 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1744 IF2DT(old_mode)); 1745 if (error) 1746 goto out_end_trans; 1747 1748 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1749 IF2DT(new_mode)); 1750 if (error) 1751 goto out_end_trans; 1752 1753 if (odip != ndip) { 1754 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1755 inc_nlink(&odip->i_inode); 1756 drop_nlink(&ndip->i_inode); 1757 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1758 inc_nlink(&ndip->i_inode); 1759 drop_nlink(&odip->i_inode); 1760 } 1761 } 1762 mark_inode_dirty(&ndip->i_inode); 1763 if (odip != ndip) 1764 mark_inode_dirty(&odip->i_inode); 1765 1766 out_end_trans: 1767 gfs2_trans_end(sdp); 1768 out_gunlock: 1769 while (x--) { 1770 if (gfs2_holder_queued(ghs + x)) 1771 gfs2_glock_dq(ghs + x); 1772 gfs2_holder_uninit(ghs + x); 1773 } 1774 out_gunlock_r: 1775 if (gfs2_holder_initialized(&r_gh)) 1776 gfs2_glock_dq_uninit(&r_gh); 1777 out: 1778 return error; 1779 } 1780 1781 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir, 1782 struct dentry *odentry, struct inode *ndir, 1783 struct dentry *ndentry, unsigned int flags) 1784 { 1785 flags &= ~RENAME_NOREPLACE; 1786 1787 if (flags & ~RENAME_EXCHANGE) 1788 return -EINVAL; 1789 1790 if (flags & RENAME_EXCHANGE) 1791 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1792 1793 return gfs2_rename(odir, odentry, ndir, ndentry); 1794 } 1795 1796 /** 1797 * gfs2_get_link - Follow a symbolic link 1798 * @dentry: The dentry of the link 1799 * @inode: The inode of the link 1800 * @done: destructor for return value 1801 * 1802 * This can handle symlinks of any size. 1803 * 1804 * Returns: 0 on success or error code 1805 */ 1806 1807 static const char *gfs2_get_link(struct dentry *dentry, 1808 struct inode *inode, 1809 struct delayed_call *done) 1810 { 1811 struct gfs2_inode *ip = GFS2_I(inode); 1812 struct gfs2_holder i_gh; 1813 struct buffer_head *dibh; 1814 unsigned int size; 1815 char *buf; 1816 int error; 1817 1818 if (!dentry) 1819 return ERR_PTR(-ECHILD); 1820 1821 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1822 error = gfs2_glock_nq(&i_gh); 1823 if (error) { 1824 gfs2_holder_uninit(&i_gh); 1825 return ERR_PTR(error); 1826 } 1827 1828 size = (unsigned int)i_size_read(&ip->i_inode); 1829 if (size == 0) { 1830 gfs2_consist_inode(ip); 1831 buf = ERR_PTR(-EIO); 1832 goto out; 1833 } 1834 1835 error = gfs2_meta_inode_buffer(ip, &dibh); 1836 if (error) { 1837 buf = ERR_PTR(error); 1838 goto out; 1839 } 1840 1841 buf = kzalloc(size + 1, GFP_NOFS); 1842 if (!buf) 1843 buf = ERR_PTR(-ENOMEM); 1844 else 1845 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1846 brelse(dibh); 1847 out: 1848 gfs2_glock_dq_uninit(&i_gh); 1849 if (!IS_ERR(buf)) 1850 set_delayed_call(done, kfree_link, buf); 1851 return buf; 1852 } 1853 1854 /** 1855 * gfs2_permission 1856 * @idmap: idmap of the mount the inode was found from 1857 * @inode: The inode 1858 * @mask: The mask to be tested 1859 * 1860 * This may be called from the VFS directly, or from within GFS2 with the 1861 * inode locked, so we look to see if the glock is already locked and only 1862 * lock the glock if its not already been done. 1863 * 1864 * Returns: errno 1865 */ 1866 1867 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode, 1868 int mask) 1869 { 1870 int may_not_block = mask & MAY_NOT_BLOCK; 1871 struct gfs2_inode *ip; 1872 struct gfs2_holder i_gh; 1873 struct gfs2_glock *gl; 1874 int error; 1875 1876 gfs2_holder_mark_uninitialized(&i_gh); 1877 ip = GFS2_I(inode); 1878 gl = rcu_dereference_check(ip->i_gl, !may_not_block); 1879 if (unlikely(!gl)) { 1880 /* inode is getting torn down, must be RCU mode */ 1881 WARN_ON_ONCE(!may_not_block); 1882 return -ECHILD; 1883 } 1884 if (gfs2_glock_is_locked_by_me(gl) == NULL) { 1885 if (may_not_block) 1886 return -ECHILD; 1887 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1888 if (error) 1889 return error; 1890 } 1891 1892 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1893 error = -EPERM; 1894 else 1895 error = generic_permission(&nop_mnt_idmap, inode, mask); 1896 if (gfs2_holder_initialized(&i_gh)) 1897 gfs2_glock_dq_uninit(&i_gh); 1898 1899 return error; 1900 } 1901 1902 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1903 { 1904 setattr_copy(&nop_mnt_idmap, inode, attr); 1905 mark_inode_dirty(inode); 1906 return 0; 1907 } 1908 1909 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1910 { 1911 int error; 1912 1913 if (current->journal_info) 1914 return __gfs2_setattr_simple(inode, attr); 1915 1916 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1917 if (error) 1918 return error; 1919 1920 error = __gfs2_setattr_simple(inode, attr); 1921 gfs2_trans_end(GFS2_SB(inode)); 1922 return error; 1923 } 1924 1925 static int setattr_chown(struct inode *inode, struct iattr *attr) 1926 { 1927 struct gfs2_inode *ip = GFS2_I(inode); 1928 struct gfs2_sbd *sdp = GFS2_SB(inode); 1929 kuid_t ouid, nuid; 1930 kgid_t ogid, ngid; 1931 int error; 1932 struct gfs2_alloc_parms ap; 1933 1934 ouid = inode->i_uid; 1935 ogid = inode->i_gid; 1936 nuid = attr->ia_uid; 1937 ngid = attr->ia_gid; 1938 1939 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1940 ouid = nuid = NO_UID_QUOTA_CHANGE; 1941 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1942 ogid = ngid = NO_GID_QUOTA_CHANGE; 1943 error = gfs2_qa_get(ip); 1944 if (error) 1945 return error; 1946 1947 error = gfs2_rindex_update(sdp); 1948 if (error) 1949 goto out; 1950 1951 error = gfs2_quota_lock(ip, nuid, ngid); 1952 if (error) 1953 goto out; 1954 1955 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1956 1957 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1958 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1959 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1960 if (error) 1961 goto out_gunlock_q; 1962 } 1963 1964 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1965 if (error) 1966 goto out_gunlock_q; 1967 1968 error = gfs2_setattr_simple(inode, attr); 1969 if (error) 1970 goto out_end_trans; 1971 1972 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1973 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1974 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1975 gfs2_quota_change(ip, ap.target, nuid, ngid); 1976 } 1977 1978 out_end_trans: 1979 gfs2_trans_end(sdp); 1980 out_gunlock_q: 1981 gfs2_quota_unlock(ip); 1982 out: 1983 gfs2_qa_put(ip); 1984 return error; 1985 } 1986 1987 /** 1988 * gfs2_setattr - Change attributes on an inode 1989 * @idmap: idmap of the mount the inode was found from 1990 * @dentry: The dentry which is changing 1991 * @attr: The structure describing the change 1992 * 1993 * The VFS layer wants to change one or more of an inodes attributes. Write 1994 * that change out to disk. 1995 * 1996 * Returns: errno 1997 */ 1998 1999 static int gfs2_setattr(struct mnt_idmap *idmap, 2000 struct dentry *dentry, struct iattr *attr) 2001 { 2002 struct inode *inode = d_inode(dentry); 2003 struct gfs2_inode *ip = GFS2_I(inode); 2004 struct gfs2_holder i_gh; 2005 int error; 2006 2007 error = gfs2_qa_get(ip); 2008 if (error) 2009 return error; 2010 2011 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 2012 if (error) 2013 goto out; 2014 2015 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid); 2016 if (error) 2017 goto error; 2018 2019 error = setattr_prepare(&nop_mnt_idmap, dentry, attr); 2020 if (error) 2021 goto error; 2022 2023 if (attr->ia_valid & ATTR_SIZE) 2024 error = gfs2_setattr_size(inode, attr->ia_size); 2025 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2026 error = setattr_chown(inode, attr); 2027 else { 2028 error = gfs2_setattr_simple(inode, attr); 2029 if (!error && attr->ia_valid & ATTR_MODE) 2030 error = posix_acl_chmod(&nop_mnt_idmap, dentry, 2031 inode->i_mode); 2032 } 2033 2034 error: 2035 if (!error) 2036 mark_inode_dirty(inode); 2037 gfs2_glock_dq_uninit(&i_gh); 2038 out: 2039 gfs2_qa_put(ip); 2040 return error; 2041 } 2042 2043 /** 2044 * gfs2_getattr - Read out an inode's attributes 2045 * @idmap: idmap of the mount the inode was found from 2046 * @path: Object to query 2047 * @stat: The inode's stats 2048 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2049 * @flags: AT_STATX_xxx setting 2050 * 2051 * This may be called from the VFS directly, or from within GFS2 with the 2052 * inode locked, so we look to see if the glock is already locked and only 2053 * lock the glock if its not already been done. Note that its the NFS 2054 * readdirplus operation which causes this to be called (from filldir) 2055 * with the glock already held. 2056 * 2057 * Returns: errno 2058 */ 2059 2060 static int gfs2_getattr(struct mnt_idmap *idmap, 2061 const struct path *path, struct kstat *stat, 2062 u32 request_mask, unsigned int flags) 2063 { 2064 struct inode *inode = d_inode(path->dentry); 2065 struct gfs2_inode *ip = GFS2_I(inode); 2066 struct gfs2_holder gh; 2067 u32 gfsflags; 2068 int error; 2069 2070 gfs2_holder_mark_uninitialized(&gh); 2071 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2072 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2073 if (error) 2074 return error; 2075 } 2076 2077 gfsflags = ip->i_diskflags; 2078 if (gfsflags & GFS2_DIF_APPENDONLY) 2079 stat->attributes |= STATX_ATTR_APPEND; 2080 if (gfsflags & GFS2_DIF_IMMUTABLE) 2081 stat->attributes |= STATX_ATTR_IMMUTABLE; 2082 2083 stat->attributes_mask |= (STATX_ATTR_APPEND | 2084 STATX_ATTR_COMPRESSED | 2085 STATX_ATTR_ENCRYPTED | 2086 STATX_ATTR_IMMUTABLE | 2087 STATX_ATTR_NODUMP); 2088 2089 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 2090 2091 if (gfs2_holder_initialized(&gh)) 2092 gfs2_glock_dq_uninit(&gh); 2093 2094 return 0; 2095 } 2096 2097 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2098 u64 start, u64 len) 2099 { 2100 struct gfs2_inode *ip = GFS2_I(inode); 2101 struct gfs2_holder gh; 2102 int ret; 2103 2104 inode_lock_shared(inode); 2105 2106 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2107 if (ret) 2108 goto out; 2109 2110 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2111 2112 gfs2_glock_dq_uninit(&gh); 2113 2114 out: 2115 inode_unlock_shared(inode); 2116 return ret; 2117 } 2118 2119 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2120 { 2121 struct inode *inode = file->f_mapping->host; 2122 struct gfs2_inode *ip = GFS2_I(inode); 2123 struct gfs2_holder gh; 2124 loff_t ret; 2125 2126 inode_lock_shared(inode); 2127 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2128 if (!ret) 2129 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2130 gfs2_glock_dq_uninit(&gh); 2131 inode_unlock_shared(inode); 2132 2133 if (ret < 0) 2134 return ret; 2135 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2136 } 2137 2138 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2139 { 2140 struct inode *inode = file->f_mapping->host; 2141 struct gfs2_inode *ip = GFS2_I(inode); 2142 struct gfs2_holder gh; 2143 loff_t ret; 2144 2145 inode_lock_shared(inode); 2146 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2147 if (!ret) 2148 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2149 gfs2_glock_dq_uninit(&gh); 2150 inode_unlock_shared(inode); 2151 2152 if (ret < 0) 2153 return ret; 2154 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2155 } 2156 2157 static int gfs2_update_time(struct inode *inode, int flags) 2158 { 2159 struct gfs2_inode *ip = GFS2_I(inode); 2160 struct gfs2_glock *gl = ip->i_gl; 2161 struct gfs2_holder *gh; 2162 int error; 2163 2164 gh = gfs2_glock_is_locked_by_me(gl); 2165 if (gh && !gfs2_glock_is_held_excl(gl)) { 2166 gfs2_glock_dq(gh); 2167 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2168 error = gfs2_glock_nq(gh); 2169 if (error) 2170 return error; 2171 } 2172 generic_update_time(inode, flags); 2173 return 0; 2174 } 2175 2176 static const struct inode_operations gfs2_file_iops = { 2177 .permission = gfs2_permission, 2178 .setattr = gfs2_setattr, 2179 .getattr = gfs2_getattr, 2180 .listxattr = gfs2_listxattr, 2181 .fiemap = gfs2_fiemap, 2182 .get_inode_acl = gfs2_get_acl, 2183 .set_acl = gfs2_set_acl, 2184 .update_time = gfs2_update_time, 2185 .fileattr_get = gfs2_fileattr_get, 2186 .fileattr_set = gfs2_fileattr_set, 2187 }; 2188 2189 static const struct inode_operations gfs2_dir_iops = { 2190 .create = gfs2_create, 2191 .lookup = gfs2_lookup, 2192 .link = gfs2_link, 2193 .unlink = gfs2_unlink, 2194 .symlink = gfs2_symlink, 2195 .mkdir = gfs2_mkdir, 2196 .rmdir = gfs2_unlink, 2197 .mknod = gfs2_mknod, 2198 .rename = gfs2_rename2, 2199 .permission = gfs2_permission, 2200 .setattr = gfs2_setattr, 2201 .getattr = gfs2_getattr, 2202 .listxattr = gfs2_listxattr, 2203 .fiemap = gfs2_fiemap, 2204 .get_inode_acl = gfs2_get_acl, 2205 .set_acl = gfs2_set_acl, 2206 .update_time = gfs2_update_time, 2207 .atomic_open = gfs2_atomic_open, 2208 .fileattr_get = gfs2_fileattr_get, 2209 .fileattr_set = gfs2_fileattr_set, 2210 }; 2211 2212 static const struct inode_operations gfs2_symlink_iops = { 2213 .get_link = gfs2_get_link, 2214 .permission = gfs2_permission, 2215 .setattr = gfs2_setattr, 2216 .getattr = gfs2_getattr, 2217 .listxattr = gfs2_listxattr, 2218 .fiemap = gfs2_fiemap, 2219 }; 2220 2221