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_set_atime(inode, 189 1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1), 190 0); 191 192 glock_set_object(ip->i_gl, ip); 193 194 if (type == DT_UNKNOWN) { 195 /* Inode glock must be locked already */ 196 error = gfs2_instantiate(&i_gh); 197 if (error) { 198 glock_clear_object(ip->i_gl, ip); 199 goto fail; 200 } 201 } else { 202 ip->i_no_formal_ino = no_formal_ino; 203 inode->i_mode = DT2IF(type); 204 } 205 206 if (gfs2_holder_initialized(&i_gh)) 207 gfs2_glock_dq_uninit(&i_gh); 208 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 209 210 gfs2_set_iop(inode); 211 unlock_new_inode(inode); 212 } 213 214 if (no_formal_ino && ip->i_no_formal_ino && 215 no_formal_ino != ip->i_no_formal_ino) { 216 iput(inode); 217 return ERR_PTR(-ESTALE); 218 } 219 220 return inode; 221 222 fail: 223 if (error == GLR_TRYFAILED) 224 error = -EAGAIN; 225 if (gfs2_holder_initialized(&ip->i_iopen_gh)) 226 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 227 if (gfs2_holder_initialized(&i_gh)) 228 gfs2_glock_dq_uninit(&i_gh); 229 if (ip->i_gl) { 230 gfs2_glock_put(ip->i_gl); 231 ip->i_gl = NULL; 232 } 233 iget_failed(inode); 234 return ERR_PTR(error); 235 } 236 237 /** 238 * gfs2_lookup_by_inum - look up an inode by inode number 239 * @sdp: The super block 240 * @no_addr: The inode number 241 * @no_formal_ino: The inode generation number (0 for any) 242 * @blktype: Requested block type (see gfs2_inode_lookup) 243 */ 244 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 245 u64 no_formal_ino, unsigned int blktype) 246 { 247 struct super_block *sb = sdp->sd_vfs; 248 struct inode *inode; 249 int error; 250 251 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 252 blktype); 253 if (IS_ERR(inode)) 254 return inode; 255 256 if (no_formal_ino) { 257 error = -EIO; 258 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 259 goto fail_iput; 260 } 261 return inode; 262 263 fail_iput: 264 iput(inode); 265 return ERR_PTR(error); 266 } 267 268 269 /** 270 * gfs2_lookup_meta - Look up an inode in a metadata directory 271 * @dip: The directory 272 * @name: The name of the inode 273 */ 274 struct inode *gfs2_lookup_meta(struct inode *dip, const char *name) 275 { 276 struct qstr qstr; 277 struct inode *inode; 278 279 gfs2_str2qstr(&qstr, name); 280 inode = gfs2_lookupi(dip, &qstr, 1); 281 if (IS_ERR_OR_NULL(inode)) 282 return inode ? inode : ERR_PTR(-ENOENT); 283 284 /* 285 * Must not call back into the filesystem when allocating 286 * pages in the metadata inode's address space. 287 */ 288 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 289 290 return inode; 291 } 292 293 294 /** 295 * gfs2_lookupi - Look up a filename in a directory and return its inode 296 * @dir: The inode of the directory containing the inode to look-up 297 * @name: The name of the inode to look for 298 * @is_root: If 1, ignore the caller's permissions 299 * 300 * This can be called via the VFS filldir function when NFS is doing 301 * a readdirplus and the inode which its intending to stat isn't 302 * already in cache. In this case we must not take the directory glock 303 * again, since the readdir call will have already taken that lock. 304 * 305 * Returns: errno 306 */ 307 308 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 309 int is_root) 310 { 311 struct super_block *sb = dir->i_sb; 312 struct gfs2_inode *dip = GFS2_I(dir); 313 struct gfs2_holder d_gh; 314 int error = 0; 315 struct inode *inode = NULL; 316 317 gfs2_holder_mark_uninitialized(&d_gh); 318 if (!name->len || name->len > GFS2_FNAMESIZE) 319 return ERR_PTR(-ENAMETOOLONG); 320 321 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 322 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 323 dir == d_inode(sb->s_root))) { 324 igrab(dir); 325 return dir; 326 } 327 328 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 329 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 330 if (error) 331 return ERR_PTR(error); 332 } 333 334 if (!is_root) { 335 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC); 336 if (error) 337 goto out; 338 } 339 340 inode = gfs2_dir_search(dir, name, false); 341 if (IS_ERR(inode)) 342 error = PTR_ERR(inode); 343 out: 344 if (gfs2_holder_initialized(&d_gh)) 345 gfs2_glock_dq_uninit(&d_gh); 346 if (error == -ENOENT) 347 return NULL; 348 return inode ? inode : ERR_PTR(error); 349 } 350 351 /** 352 * create_ok - OK to create a new on-disk inode here? 353 * @dip: Directory in which dinode is to be created 354 * @name: Name of new dinode 355 * @mode: 356 * 357 * Returns: errno 358 */ 359 360 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 361 umode_t mode) 362 { 363 int error; 364 365 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 366 MAY_WRITE | MAY_EXEC); 367 if (error) 368 return error; 369 370 /* Don't create entries in an unlinked directory */ 371 if (!dip->i_inode.i_nlink) 372 return -ENOENT; 373 374 if (dip->i_entries == (u32)-1) 375 return -EFBIG; 376 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 377 return -EMLINK; 378 379 return 0; 380 } 381 382 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 383 struct inode *inode) 384 { 385 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 386 (dip->i_inode.i_mode & S_ISUID) && 387 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 388 if (S_ISDIR(inode->i_mode)) 389 inode->i_mode |= S_ISUID; 390 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 391 inode->i_mode &= ~07111; 392 inode->i_uid = dip->i_inode.i_uid; 393 } else 394 inode->i_uid = current_fsuid(); 395 396 if (dip->i_inode.i_mode & S_ISGID) { 397 if (S_ISDIR(inode->i_mode)) 398 inode->i_mode |= S_ISGID; 399 inode->i_gid = dip->i_inode.i_gid; 400 } else 401 inode->i_gid = current_fsgid(); 402 } 403 404 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 405 { 406 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 407 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 408 int error; 409 410 error = gfs2_quota_lock_check(ip, &ap); 411 if (error) 412 goto out; 413 414 error = gfs2_inplace_reserve(ip, &ap); 415 if (error) 416 goto out_quota; 417 418 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 419 if (error) 420 goto out_ipreserv; 421 422 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1); 423 if (error) 424 goto out_trans_end; 425 426 ip->i_no_formal_ino = ip->i_generation; 427 ip->i_inode.i_ino = ip->i_no_addr; 428 ip->i_goal = ip->i_no_addr; 429 if (*dblocks > 1) 430 ip->i_eattr = ip->i_no_addr + 1; 431 432 out_trans_end: 433 gfs2_trans_end(sdp); 434 out_ipreserv: 435 gfs2_inplace_release(ip); 436 out_quota: 437 gfs2_quota_unlock(ip); 438 out: 439 return error; 440 } 441 442 static void gfs2_final_release_pages(struct gfs2_inode *ip) 443 { 444 struct inode *inode = &ip->i_inode; 445 struct gfs2_glock *gl = ip->i_gl; 446 447 if (unlikely(!gl)) { 448 /* This can only happen during incomplete inode creation. */ 449 BUG_ON(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)); 450 return; 451 } 452 453 truncate_inode_pages(gfs2_glock2aspace(gl), 0); 454 truncate_inode_pages(&inode->i_data, 0); 455 456 if (atomic_read(&gl->gl_revokes) == 0) { 457 clear_bit(GLF_LFLUSH, &gl->gl_flags); 458 clear_bit(GLF_DIRTY, &gl->gl_flags); 459 } 460 } 461 462 int gfs2_dinode_dealloc(struct gfs2_inode *ip) 463 { 464 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 465 struct gfs2_rgrpd *rgd; 466 struct gfs2_holder gh; 467 int error; 468 469 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 470 gfs2_consist_inode(ip); 471 return -EIO; 472 } 473 474 gfs2_rindex_update(sdp); 475 476 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 477 if (error) 478 return error; 479 480 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 481 if (!rgd) { 482 gfs2_consist_inode(ip); 483 error = -EIO; 484 goto out_qs; 485 } 486 487 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 488 LM_FLAG_NODE_SCOPE, &gh); 489 if (error) 490 goto out_qs; 491 492 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 493 sdp->sd_jdesc->jd_blocks); 494 if (error) 495 goto out_rg_gunlock; 496 497 gfs2_free_di(rgd, ip); 498 499 gfs2_final_release_pages(ip); 500 501 gfs2_trans_end(sdp); 502 503 out_rg_gunlock: 504 gfs2_glock_dq_uninit(&gh); 505 out_qs: 506 gfs2_quota_unhold(ip); 507 return error; 508 } 509 510 static void gfs2_init_dir(struct buffer_head *dibh, 511 const struct gfs2_inode *parent) 512 { 513 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 514 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 515 516 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 517 dent->de_inum = di->di_num; /* already GFS2 endian */ 518 dent->de_type = cpu_to_be16(DT_DIR); 519 520 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 521 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 522 gfs2_inum_out(parent, dent); 523 dent->de_type = cpu_to_be16(DT_DIR); 524 525 } 526 527 /** 528 * gfs2_init_xattr - Initialise an xattr block for a new inode 529 * @ip: The inode in question 530 * 531 * This sets up an empty xattr block for a new inode, ready to 532 * take any ACLs, LSM xattrs, etc. 533 */ 534 535 static void gfs2_init_xattr(struct gfs2_inode *ip) 536 { 537 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 538 struct buffer_head *bh; 539 struct gfs2_ea_header *ea; 540 541 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 542 gfs2_trans_add_meta(ip->i_gl, bh); 543 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 544 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 545 546 ea = GFS2_EA_BH2FIRST(bh); 547 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 548 ea->ea_type = GFS2_EATYPE_UNUSED; 549 ea->ea_flags = GFS2_EAFLAG_LAST; 550 551 brelse(bh); 552 } 553 554 /** 555 * init_dinode - Fill in a new dinode structure 556 * @dip: The directory this inode is being created in 557 * @ip: The inode 558 * @symname: The symlink destination (if a symlink) 559 * 560 */ 561 562 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 563 const char *symname) 564 { 565 struct gfs2_dinode *di; 566 struct buffer_head *dibh; 567 568 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 569 gfs2_trans_add_meta(ip->i_gl, dibh); 570 di = (struct gfs2_dinode *)dibh->b_data; 571 gfs2_dinode_out(ip, di); 572 573 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 574 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 575 di->__pad1 = 0; 576 di->__pad2 = 0; 577 di->__pad3 = 0; 578 memset(&di->__pad4, 0, sizeof(di->__pad4)); 579 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 580 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 581 582 switch(ip->i_inode.i_mode & S_IFMT) { 583 case S_IFDIR: 584 gfs2_init_dir(dibh, dip); 585 break; 586 case S_IFLNK: 587 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 588 break; 589 } 590 591 set_buffer_uptodate(dibh); 592 brelse(dibh); 593 } 594 595 /** 596 * gfs2_trans_da_blks - Calculate number of blocks to link inode 597 * @dip: The directory we are linking into 598 * @da: The dir add information 599 * @nr_inodes: The number of inodes involved 600 * 601 * This calculate the number of blocks we need to reserve in a 602 * transaction to link @nr_inodes into a directory. In most cases 603 * @nr_inodes will be 2 (the directory plus the inode being linked in) 604 * but in case of rename, 4 may be required. 605 * 606 * Returns: Number of blocks 607 */ 608 609 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 610 const struct gfs2_diradd *da, 611 unsigned nr_inodes) 612 { 613 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 614 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 615 } 616 617 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 618 struct gfs2_inode *ip, struct gfs2_diradd *da) 619 { 620 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 621 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 622 int error; 623 624 if (da->nr_blocks) { 625 error = gfs2_quota_lock_check(dip, &ap); 626 if (error) 627 goto fail_quota_locks; 628 629 error = gfs2_inplace_reserve(dip, &ap); 630 if (error) 631 goto fail_quota_locks; 632 633 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 634 if (error) 635 goto fail_ipreserv; 636 } else { 637 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 638 if (error) 639 goto fail_quota_locks; 640 } 641 642 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 643 644 gfs2_trans_end(sdp); 645 fail_ipreserv: 646 gfs2_inplace_release(dip); 647 fail_quota_locks: 648 gfs2_quota_unlock(dip); 649 return error; 650 } 651 652 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 653 void *fs_info) 654 { 655 const struct xattr *xattr; 656 int err = 0; 657 658 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 659 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 660 xattr->value_len, 0, 661 GFS2_EATYPE_SECURITY); 662 if (err < 0) 663 break; 664 } 665 return err; 666 } 667 668 /** 669 * gfs2_create_inode - Create a new inode 670 * @dir: The parent directory 671 * @dentry: The new dentry 672 * @file: If non-NULL, the file which is being opened 673 * @mode: The permissions on the new inode 674 * @dev: For device nodes, this is the device number 675 * @symname: For symlinks, this is the link destination 676 * @size: The initial size of the inode (ignored for directories) 677 * @excl: Force fail if inode exists 678 * 679 * FIXME: Change to allocate the disk blocks and write them out in the same 680 * transaction. That way, we can no longer end up in a situation in which an 681 * inode is allocated, the node crashes, and the block looks like a valid 682 * inode. (With atomic creates in place, we will also no longer need to zero 683 * the link count and dirty the inode here on failure.) 684 * 685 * Returns: 0 on success, or error code 686 */ 687 688 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 689 struct file *file, 690 umode_t mode, dev_t dev, const char *symname, 691 unsigned int size, int excl) 692 { 693 const struct qstr *name = &dentry->d_name; 694 struct posix_acl *default_acl, *acl; 695 struct gfs2_holder d_gh, gh; 696 struct inode *inode = NULL; 697 struct gfs2_inode *dip = GFS2_I(dir), *ip; 698 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 699 struct gfs2_glock *io_gl; 700 int error, dealloc_error; 701 u32 aflags = 0; 702 unsigned blocks = 1; 703 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 704 bool xattr_initialized = false; 705 706 if (!name->len || name->len > GFS2_FNAMESIZE) 707 return -ENAMETOOLONG; 708 709 error = gfs2_qa_get(dip); 710 if (error) 711 return error; 712 713 error = gfs2_rindex_update(sdp); 714 if (error) 715 goto fail; 716 717 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 718 if (error) 719 goto fail; 720 gfs2_holder_mark_uninitialized(&gh); 721 722 error = create_ok(dip, name, mode); 723 if (error) 724 goto fail_gunlock; 725 726 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 727 error = PTR_ERR(inode); 728 if (!IS_ERR(inode)) { 729 if (S_ISDIR(inode->i_mode)) { 730 iput(inode); 731 inode = NULL; 732 error = -EISDIR; 733 goto fail_gunlock; 734 } 735 d_instantiate(dentry, inode); 736 error = 0; 737 if (file) { 738 if (S_ISREG(inode->i_mode)) 739 error = finish_open(file, dentry, gfs2_open_common); 740 else 741 error = finish_no_open(file, NULL); 742 } 743 gfs2_glock_dq_uninit(&d_gh); 744 goto fail; 745 } else if (error != -ENOENT) { 746 goto fail_gunlock; 747 } 748 749 error = gfs2_diradd_alloc_required(dir, name, &da); 750 if (error < 0) 751 goto fail_gunlock; 752 753 inode = new_inode(sdp->sd_vfs); 754 error = -ENOMEM; 755 if (!inode) 756 goto fail_gunlock; 757 ip = GFS2_I(inode); 758 759 error = posix_acl_create(dir, &mode, &default_acl, &acl); 760 if (error) 761 goto fail_gunlock; 762 763 error = gfs2_qa_get(ip); 764 if (error) 765 goto fail_free_acls; 766 767 inode->i_mode = mode; 768 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 769 inode->i_rdev = dev; 770 inode->i_size = size; 771 simple_inode_init_ts(inode); 772 munge_mode_uid_gid(dip, inode); 773 check_and_update_goal(dip); 774 ip->i_goal = dip->i_goal; 775 ip->i_diskflags = 0; 776 ip->i_eattr = 0; 777 ip->i_height = 0; 778 ip->i_depth = 0; 779 ip->i_entries = 0; 780 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 781 782 switch(mode & S_IFMT) { 783 case S_IFREG: 784 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 785 gfs2_tune_get(sdp, gt_new_files_jdata)) 786 ip->i_diskflags |= GFS2_DIF_JDATA; 787 gfs2_set_aops(inode); 788 break; 789 case S_IFDIR: 790 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 791 ip->i_diskflags |= GFS2_DIF_JDATA; 792 ip->i_entries = 2; 793 break; 794 } 795 796 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 797 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 798 ip->i_diskflags |= GFS2_DIF_SYSTEM; 799 800 gfs2_set_inode_flags(inode); 801 802 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 803 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 804 aflags |= GFS2_AF_ORLOV; 805 806 if (default_acl || acl) 807 blocks++; 808 809 error = alloc_dinode(ip, aflags, &blocks); 810 if (error) 811 goto fail_free_inode; 812 813 gfs2_set_inode_blocks(inode, blocks); 814 815 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 816 if (error) 817 goto fail_dealloc_inode; 818 819 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 820 if (error) 821 goto fail_dealloc_inode; 822 gfs2_cancel_delete_work(io_gl); 823 io_gl->gl_no_formal_ino = ip->i_no_formal_ino; 824 825 retry: 826 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); 827 if (error == -EBUSY) 828 goto retry; 829 if (error) 830 goto fail_gunlock2; 831 832 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID, 833 &ip->i_iopen_gh); 834 if (error) 835 goto fail_gunlock2; 836 837 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 838 if (error) 839 goto fail_gunlock3; 840 clear_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags); 841 842 error = gfs2_trans_begin(sdp, blocks, 0); 843 if (error) 844 goto fail_gunlock3; 845 846 if (blocks > 1) { 847 gfs2_init_xattr(ip); 848 xattr_initialized = true; 849 } 850 init_dinode(dip, ip, symname); 851 gfs2_trans_end(sdp); 852 853 glock_set_object(ip->i_gl, ip); 854 glock_set_object(io_gl, ip); 855 gfs2_set_iop(inode); 856 857 if (default_acl) { 858 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 859 if (error) 860 goto fail_gunlock4; 861 posix_acl_release(default_acl); 862 default_acl = NULL; 863 } 864 if (acl) { 865 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 866 if (error) 867 goto fail_gunlock4; 868 posix_acl_release(acl); 869 acl = NULL; 870 } 871 872 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 873 &gfs2_initxattrs, NULL); 874 if (error) 875 goto fail_gunlock4; 876 877 error = link_dinode(dip, name, ip, &da); 878 if (error) 879 goto fail_gunlock4; 880 881 mark_inode_dirty(inode); 882 d_instantiate(dentry, inode); 883 /* After instantiate, errors should result in evict which will destroy 884 * both inode and iopen glocks properly. */ 885 if (file) { 886 file->f_mode |= FMODE_CREATED; 887 error = finish_open(file, dentry, gfs2_open_common); 888 } 889 gfs2_glock_dq_uninit(&d_gh); 890 gfs2_qa_put(ip); 891 gfs2_glock_dq_uninit(&gh); 892 gfs2_glock_put(io_gl); 893 gfs2_qa_put(dip); 894 unlock_new_inode(inode); 895 return error; 896 897 fail_gunlock4: 898 glock_clear_object(ip->i_gl, ip); 899 glock_clear_object(io_gl, ip); 900 fail_gunlock3: 901 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 902 fail_gunlock2: 903 gfs2_glock_put(io_gl); 904 fail_dealloc_inode: 905 set_bit(GIF_ALLOC_FAILED, &ip->i_flags); 906 dealloc_error = 0; 907 if (ip->i_eattr) 908 dealloc_error = gfs2_ea_dealloc(ip, xattr_initialized); 909 clear_nlink(inode); 910 mark_inode_dirty(inode); 911 if (!dealloc_error) 912 dealloc_error = gfs2_dinode_dealloc(ip); 913 if (dealloc_error) 914 fs_warn(sdp, "%s: %d\n", __func__, dealloc_error); 915 ip->i_no_addr = 0; 916 fail_free_inode: 917 if (ip->i_gl) { 918 gfs2_glock_put(ip->i_gl); 919 ip->i_gl = NULL; 920 } 921 gfs2_rs_deltree(&ip->i_res); 922 gfs2_qa_put(ip); 923 fail_free_acls: 924 posix_acl_release(default_acl); 925 posix_acl_release(acl); 926 fail_gunlock: 927 gfs2_dir_no_add(&da); 928 gfs2_glock_dq_uninit(&d_gh); 929 if (!IS_ERR_OR_NULL(inode)) { 930 if (inode->i_state & I_NEW) 931 iget_failed(inode); 932 else 933 iput(inode); 934 } 935 if (gfs2_holder_initialized(&gh)) 936 gfs2_glock_dq_uninit(&gh); 937 fail: 938 gfs2_qa_put(dip); 939 return error; 940 } 941 942 /** 943 * gfs2_create - Create a file 944 * @idmap: idmap of the mount the inode was found from 945 * @dir: The directory in which to create the file 946 * @dentry: The dentry of the new file 947 * @mode: The mode of the new file 948 * @excl: Force fail if inode exists 949 * 950 * Returns: errno 951 */ 952 953 static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir, 954 struct dentry *dentry, umode_t mode, bool excl) 955 { 956 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 957 } 958 959 /** 960 * __gfs2_lookup - Look up a filename in a directory and return its inode 961 * @dir: The directory inode 962 * @dentry: The dentry of the new inode 963 * @file: File to be opened 964 * 965 * 966 * Returns: errno 967 */ 968 969 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 970 struct file *file) 971 { 972 struct inode *inode; 973 struct dentry *d; 974 struct gfs2_holder gh; 975 struct gfs2_glock *gl; 976 int error; 977 978 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 979 if (inode == NULL) { 980 d_add(dentry, NULL); 981 return NULL; 982 } 983 if (IS_ERR(inode)) 984 return ERR_CAST(inode); 985 986 gl = GFS2_I(inode)->i_gl; 987 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 988 if (error) { 989 iput(inode); 990 return ERR_PTR(error); 991 } 992 993 d = d_splice_alias(inode, dentry); 994 if (IS_ERR(d)) { 995 gfs2_glock_dq_uninit(&gh); 996 return d; 997 } 998 if (file && S_ISREG(inode->i_mode)) 999 error = finish_open(file, dentry, gfs2_open_common); 1000 1001 gfs2_glock_dq_uninit(&gh); 1002 if (error) { 1003 dput(d); 1004 return ERR_PTR(error); 1005 } 1006 return d; 1007 } 1008 1009 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 1010 unsigned flags) 1011 { 1012 return __gfs2_lookup(dir, dentry, NULL); 1013 } 1014 1015 /** 1016 * gfs2_link - Link to a file 1017 * @old_dentry: The inode to link 1018 * @dir: Add link to this directory 1019 * @dentry: The name of the link 1020 * 1021 * Link the inode in "old_dentry" into the directory "dir" with the 1022 * name in "dentry". 1023 * 1024 * Returns: errno 1025 */ 1026 1027 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 1028 struct dentry *dentry) 1029 { 1030 struct gfs2_inode *dip = GFS2_I(dir); 1031 struct gfs2_sbd *sdp = GFS2_SB(dir); 1032 struct inode *inode = d_inode(old_dentry); 1033 struct gfs2_inode *ip = GFS2_I(inode); 1034 struct gfs2_holder d_gh, gh; 1035 struct buffer_head *dibh; 1036 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 1037 int error; 1038 1039 if (S_ISDIR(inode->i_mode)) 1040 return -EPERM; 1041 1042 error = gfs2_qa_get(dip); 1043 if (error) 1044 return error; 1045 1046 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1047 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1048 1049 error = gfs2_glock_nq(&d_gh); 1050 if (error) 1051 goto out_parent; 1052 1053 error = gfs2_glock_nq(&gh); 1054 if (error) 1055 goto out_child; 1056 1057 error = -ENOENT; 1058 if (inode->i_nlink == 0) 1059 goto out_gunlock; 1060 1061 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC); 1062 if (error) 1063 goto out_gunlock; 1064 1065 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 1066 switch (error) { 1067 case -ENOENT: 1068 break; 1069 case 0: 1070 error = -EEXIST; 1071 goto out_gunlock; 1072 default: 1073 goto out_gunlock; 1074 } 1075 1076 error = -EINVAL; 1077 if (!dip->i_inode.i_nlink) 1078 goto out_gunlock; 1079 error = -EFBIG; 1080 if (dip->i_entries == (u32)-1) 1081 goto out_gunlock; 1082 error = -EPERM; 1083 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1084 goto out_gunlock; 1085 error = -EMLINK; 1086 if (ip->i_inode.i_nlink == (u32)-1) 1087 goto out_gunlock; 1088 1089 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 1090 if (error < 0) 1091 goto out_gunlock; 1092 1093 if (da.nr_blocks) { 1094 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1095 error = gfs2_quota_lock_check(dip, &ap); 1096 if (error) 1097 goto out_gunlock; 1098 1099 error = gfs2_inplace_reserve(dip, &ap); 1100 if (error) 1101 goto out_gunlock_q; 1102 1103 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1104 if (error) 1105 goto out_ipres; 1106 } else { 1107 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1108 if (error) 1109 goto out_ipres; 1110 } 1111 1112 error = gfs2_meta_inode_buffer(ip, &dibh); 1113 if (error) 1114 goto out_end_trans; 1115 1116 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1117 if (error) 1118 goto out_brelse; 1119 1120 gfs2_trans_add_meta(ip->i_gl, dibh); 1121 inc_nlink(&ip->i_inode); 1122 inode_set_ctime_current(&ip->i_inode); 1123 ihold(inode); 1124 d_instantiate(dentry, inode); 1125 mark_inode_dirty(inode); 1126 1127 out_brelse: 1128 brelse(dibh); 1129 out_end_trans: 1130 gfs2_trans_end(sdp); 1131 out_ipres: 1132 if (da.nr_blocks) 1133 gfs2_inplace_release(dip); 1134 out_gunlock_q: 1135 if (da.nr_blocks) 1136 gfs2_quota_unlock(dip); 1137 out_gunlock: 1138 gfs2_dir_no_add(&da); 1139 gfs2_glock_dq(&gh); 1140 out_child: 1141 gfs2_glock_dq(&d_gh); 1142 out_parent: 1143 gfs2_qa_put(dip); 1144 gfs2_holder_uninit(&d_gh); 1145 gfs2_holder_uninit(&gh); 1146 return error; 1147 } 1148 1149 /* 1150 * gfs2_unlink_ok - check to see that a inode is still in a directory 1151 * @dip: the directory 1152 * @name: the name of the file 1153 * @ip: the inode 1154 * 1155 * Assumes that the lock on (at least) @dip is held. 1156 * 1157 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1158 */ 1159 1160 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1161 const struct gfs2_inode *ip) 1162 { 1163 int error; 1164 1165 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1166 return -EPERM; 1167 1168 if ((dip->i_inode.i_mode & S_ISVTX) && 1169 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1170 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1171 return -EPERM; 1172 1173 if (IS_APPEND(&dip->i_inode)) 1174 return -EPERM; 1175 1176 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 1177 MAY_WRITE | MAY_EXEC); 1178 if (error) 1179 return error; 1180 1181 return gfs2_dir_check(&dip->i_inode, name, ip); 1182 } 1183 1184 /** 1185 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1186 * @dip: The parent directory 1187 * @dentry: The dentry to unlink 1188 * 1189 * Called with all the locks and in a transaction. This will only be 1190 * called for a directory after it has been checked to ensure it is empty. 1191 * 1192 * Returns: 0 on success, or an error 1193 */ 1194 1195 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1196 const struct dentry *dentry) 1197 { 1198 struct inode *inode = d_inode(dentry); 1199 struct gfs2_inode *ip = GFS2_I(inode); 1200 int error; 1201 1202 error = gfs2_dir_del(dip, dentry); 1203 if (error) 1204 return error; 1205 1206 ip->i_entries = 0; 1207 inode_set_ctime_current(inode); 1208 if (S_ISDIR(inode->i_mode)) 1209 clear_nlink(inode); 1210 else 1211 drop_nlink(inode); 1212 mark_inode_dirty(inode); 1213 if (inode->i_nlink == 0) 1214 gfs2_unlink_di(inode); 1215 return 0; 1216 } 1217 1218 1219 /** 1220 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1221 * @dir: The inode of the directory containing the inode to unlink 1222 * @dentry: The file itself 1223 * 1224 * This routine uses the type of the inode as a flag to figure out 1225 * whether this is an unlink or an rmdir. 1226 * 1227 * Returns: errno 1228 */ 1229 1230 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1231 { 1232 struct gfs2_inode *dip = GFS2_I(dir); 1233 struct gfs2_sbd *sdp = GFS2_SB(dir); 1234 struct inode *inode = d_inode(dentry); 1235 struct gfs2_inode *ip = GFS2_I(inode); 1236 struct gfs2_holder d_gh, r_gh, gh; 1237 struct gfs2_rgrpd *rgd; 1238 int error; 1239 1240 error = gfs2_rindex_update(sdp); 1241 if (error) 1242 return error; 1243 1244 error = -EROFS; 1245 1246 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1247 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1248 1249 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1250 if (!rgd) 1251 goto out_inodes; 1252 1253 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh); 1254 1255 1256 error = gfs2_glock_nq(&d_gh); 1257 if (error) 1258 goto out_parent; 1259 1260 error = gfs2_glock_nq(&gh); 1261 if (error) 1262 goto out_child; 1263 1264 error = -ENOENT; 1265 if (inode->i_nlink == 0) 1266 goto out_rgrp; 1267 1268 if (S_ISDIR(inode->i_mode)) { 1269 error = -ENOTEMPTY; 1270 if (ip->i_entries > 2 || inode->i_nlink > 2) 1271 goto out_rgrp; 1272 } 1273 1274 error = gfs2_glock_nq(&r_gh); /* rgrp */ 1275 if (error) 1276 goto out_rgrp; 1277 1278 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1279 if (error) 1280 goto out_gunlock; 1281 1282 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1283 if (error) 1284 goto out_gunlock; 1285 1286 error = gfs2_unlink_inode(dip, dentry); 1287 gfs2_trans_end(sdp); 1288 1289 out_gunlock: 1290 gfs2_glock_dq(&r_gh); 1291 out_rgrp: 1292 gfs2_glock_dq(&gh); 1293 out_child: 1294 gfs2_glock_dq(&d_gh); 1295 out_parent: 1296 gfs2_holder_uninit(&r_gh); 1297 out_inodes: 1298 gfs2_holder_uninit(&gh); 1299 gfs2_holder_uninit(&d_gh); 1300 return error; 1301 } 1302 1303 /** 1304 * gfs2_symlink - Create a symlink 1305 * @idmap: idmap of the mount the inode was found from 1306 * @dir: The directory to create the symlink in 1307 * @dentry: The dentry to put the symlink in 1308 * @symname: The thing which the link points to 1309 * 1310 * Returns: errno 1311 */ 1312 1313 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir, 1314 struct dentry *dentry, const char *symname) 1315 { 1316 unsigned int size; 1317 1318 size = strlen(symname); 1319 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1320 return -ENAMETOOLONG; 1321 1322 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1323 } 1324 1325 /** 1326 * gfs2_mkdir - Make a directory 1327 * @idmap: idmap of the mount the inode was found from 1328 * @dir: The parent directory of the new one 1329 * @dentry: The dentry of the new directory 1330 * @mode: The mode of the new directory 1331 * 1332 * Returns: the dentry, or ERR_PTR(errno) 1333 */ 1334 1335 static struct dentry *gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1336 struct dentry *dentry, umode_t mode) 1337 { 1338 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1339 1340 return ERR_PTR(gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0)); 1341 } 1342 1343 /** 1344 * gfs2_mknod - Make a special file 1345 * @idmap: idmap of the mount the inode was found from 1346 * @dir: The directory in which the special file will reside 1347 * @dentry: The dentry of the special file 1348 * @mode: The mode of the special file 1349 * @dev: The device specification of the special file 1350 * 1351 */ 1352 1353 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir, 1354 struct dentry *dentry, umode_t mode, dev_t dev) 1355 { 1356 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1357 } 1358 1359 /** 1360 * gfs2_atomic_open - Atomically open a file 1361 * @dir: The directory 1362 * @dentry: The proposed new entry 1363 * @file: The proposed new struct file 1364 * @flags: open flags 1365 * @mode: File mode 1366 * 1367 * Returns: error code or 0 for success 1368 */ 1369 1370 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1371 struct file *file, unsigned flags, 1372 umode_t mode) 1373 { 1374 struct dentry *d; 1375 bool excl = !!(flags & O_EXCL); 1376 1377 if (!d_in_lookup(dentry)) 1378 goto skip_lookup; 1379 1380 d = __gfs2_lookup(dir, dentry, file); 1381 if (IS_ERR(d)) 1382 return PTR_ERR(d); 1383 if (d != NULL) 1384 dentry = d; 1385 if (d_really_is_positive(dentry)) { 1386 if (!(file->f_mode & FMODE_OPENED)) 1387 return finish_no_open(file, d); 1388 dput(d); 1389 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1390 } 1391 1392 BUG_ON(d != NULL); 1393 1394 skip_lookup: 1395 if (!(flags & O_CREAT)) 1396 return -ENOENT; 1397 1398 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1399 } 1400 1401 /* 1402 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1403 * @this: move this 1404 * @to: to here 1405 * 1406 * Follow @to back to the root and make sure we don't encounter @this 1407 * Assumes we already hold the rename lock. 1408 * 1409 * Returns: errno 1410 */ 1411 1412 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1413 { 1414 struct inode *dir = &to->i_inode; 1415 struct super_block *sb = dir->i_sb; 1416 struct inode *tmp; 1417 int error = 0; 1418 1419 igrab(dir); 1420 1421 for (;;) { 1422 if (dir == &this->i_inode) { 1423 error = -EINVAL; 1424 break; 1425 } 1426 if (dir == d_inode(sb->s_root)) { 1427 error = 0; 1428 break; 1429 } 1430 1431 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1432 if (!tmp) { 1433 error = -ENOENT; 1434 break; 1435 } 1436 if (IS_ERR(tmp)) { 1437 error = PTR_ERR(tmp); 1438 break; 1439 } 1440 1441 iput(dir); 1442 dir = tmp; 1443 } 1444 1445 iput(dir); 1446 1447 return error; 1448 } 1449 1450 /** 1451 * update_moved_ino - Update an inode that's being moved 1452 * @ip: The inode being moved 1453 * @ndip: The parent directory of the new filename 1454 * @dir_rename: True of ip is a directory 1455 * 1456 * Returns: errno 1457 */ 1458 1459 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1460 int dir_rename) 1461 { 1462 if (dir_rename) 1463 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1464 1465 inode_set_ctime_current(&ip->i_inode); 1466 mark_inode_dirty_sync(&ip->i_inode); 1467 return 0; 1468 } 1469 1470 1471 /** 1472 * gfs2_rename - Rename a file 1473 * @odir: Parent directory of old file name 1474 * @odentry: The old dentry of the file 1475 * @ndir: Parent directory of new file name 1476 * @ndentry: The new dentry of the file 1477 * 1478 * Returns: errno 1479 */ 1480 1481 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1482 struct inode *ndir, struct dentry *ndentry) 1483 { 1484 struct gfs2_inode *odip = GFS2_I(odir); 1485 struct gfs2_inode *ndip = GFS2_I(ndir); 1486 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1487 struct gfs2_inode *nip = NULL; 1488 struct gfs2_sbd *sdp = GFS2_SB(odir); 1489 struct gfs2_holder ghs[4], r_gh, rd_gh; 1490 struct gfs2_rgrpd *nrgd; 1491 unsigned int num_gh; 1492 int dir_rename = 0; 1493 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1494 unsigned int x; 1495 int error; 1496 1497 gfs2_holder_mark_uninitialized(&r_gh); 1498 gfs2_holder_mark_uninitialized(&rd_gh); 1499 if (d_really_is_positive(ndentry)) { 1500 nip = GFS2_I(d_inode(ndentry)); 1501 if (ip == nip) 1502 return 0; 1503 } 1504 1505 error = gfs2_rindex_update(sdp); 1506 if (error) 1507 return error; 1508 1509 error = gfs2_qa_get(ndip); 1510 if (error) 1511 return error; 1512 1513 if (odip != ndip) { 1514 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1515 0, &r_gh); 1516 if (error) 1517 goto out; 1518 1519 if (S_ISDIR(ip->i_inode.i_mode)) { 1520 dir_rename = 1; 1521 /* don't move a directory into its subdir */ 1522 error = gfs2_ok_to_move(ip, ndip); 1523 if (error) 1524 goto out_gunlock_r; 1525 } 1526 } 1527 1528 num_gh = 1; 1529 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1530 if (odip != ndip) { 1531 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1532 ghs + num_gh); 1533 num_gh++; 1534 } 1535 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1536 num_gh++; 1537 1538 if (nip) { 1539 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1540 ghs + num_gh); 1541 num_gh++; 1542 } 1543 1544 for (x = 0; x < num_gh; x++) { 1545 error = gfs2_glock_nq(ghs + x); 1546 if (error) 1547 goto out_gunlock; 1548 } 1549 error = gfs2_glock_async_wait(num_gh, ghs); 1550 if (error) 1551 goto out_gunlock; 1552 1553 if (nip) { 1554 /* Grab the resource group glock for unlink flag twiddling. 1555 * This is the case where the target dinode already exists 1556 * so we unlink before doing the rename. 1557 */ 1558 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1559 if (!nrgd) { 1560 error = -ENOENT; 1561 goto out_gunlock; 1562 } 1563 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1564 LM_FLAG_NODE_SCOPE, &rd_gh); 1565 if (error) 1566 goto out_gunlock; 1567 } 1568 1569 error = -ENOENT; 1570 if (ip->i_inode.i_nlink == 0) 1571 goto out_gunlock; 1572 1573 /* Check out the old directory */ 1574 1575 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1576 if (error) 1577 goto out_gunlock; 1578 1579 /* Check out the new directory */ 1580 1581 if (nip) { 1582 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1583 if (error) 1584 goto out_gunlock; 1585 1586 if (nip->i_inode.i_nlink == 0) { 1587 error = -EAGAIN; 1588 goto out_gunlock; 1589 } 1590 1591 if (S_ISDIR(nip->i_inode.i_mode)) { 1592 if (nip->i_entries < 2) { 1593 gfs2_consist_inode(nip); 1594 error = -EIO; 1595 goto out_gunlock; 1596 } 1597 if (nip->i_entries > 2) { 1598 error = -ENOTEMPTY; 1599 goto out_gunlock; 1600 } 1601 } 1602 } else { 1603 error = gfs2_permission(&nop_mnt_idmap, ndir, 1604 MAY_WRITE | MAY_EXEC); 1605 if (error) 1606 goto out_gunlock; 1607 1608 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1609 switch (error) { 1610 case -ENOENT: 1611 error = 0; 1612 break; 1613 case 0: 1614 error = -EEXIST; 1615 goto out_gunlock; 1616 default: 1617 goto out_gunlock; 1618 } 1619 1620 if (odip != ndip) { 1621 if (!ndip->i_inode.i_nlink) { 1622 error = -ENOENT; 1623 goto out_gunlock; 1624 } 1625 if (ndip->i_entries == (u32)-1) { 1626 error = -EFBIG; 1627 goto out_gunlock; 1628 } 1629 if (S_ISDIR(ip->i_inode.i_mode) && 1630 ndip->i_inode.i_nlink == (u32)-1) { 1631 error = -EMLINK; 1632 goto out_gunlock; 1633 } 1634 } 1635 } 1636 1637 /* Check out the dir to be renamed */ 1638 1639 if (dir_rename) { 1640 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry), 1641 MAY_WRITE); 1642 if (error) 1643 goto out_gunlock; 1644 } 1645 1646 if (nip == NULL) { 1647 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1648 if (error) 1649 goto out_gunlock; 1650 } 1651 1652 if (da.nr_blocks) { 1653 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1654 error = gfs2_quota_lock_check(ndip, &ap); 1655 if (error) 1656 goto out_gunlock; 1657 1658 error = gfs2_inplace_reserve(ndip, &ap); 1659 if (error) 1660 goto out_gunlock_q; 1661 1662 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1663 4 * RES_LEAF + 4, 0); 1664 if (error) 1665 goto out_ipreserv; 1666 } else { 1667 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1668 5 * RES_LEAF + 4, 0); 1669 if (error) 1670 goto out_gunlock; 1671 } 1672 1673 /* Remove the target file, if it exists */ 1674 1675 if (nip) 1676 error = gfs2_unlink_inode(ndip, ndentry); 1677 1678 error = update_moved_ino(ip, ndip, dir_rename); 1679 if (error) 1680 goto out_end_trans; 1681 1682 error = gfs2_dir_del(odip, odentry); 1683 if (error) 1684 goto out_end_trans; 1685 1686 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1687 if (error) 1688 goto out_end_trans; 1689 1690 out_end_trans: 1691 gfs2_trans_end(sdp); 1692 out_ipreserv: 1693 if (da.nr_blocks) 1694 gfs2_inplace_release(ndip); 1695 out_gunlock_q: 1696 if (da.nr_blocks) 1697 gfs2_quota_unlock(ndip); 1698 out_gunlock: 1699 gfs2_dir_no_add(&da); 1700 if (gfs2_holder_initialized(&rd_gh)) 1701 gfs2_glock_dq_uninit(&rd_gh); 1702 1703 while (x--) { 1704 if (gfs2_holder_queued(ghs + x)) 1705 gfs2_glock_dq(ghs + x); 1706 gfs2_holder_uninit(ghs + x); 1707 } 1708 out_gunlock_r: 1709 if (gfs2_holder_initialized(&r_gh)) 1710 gfs2_glock_dq_uninit(&r_gh); 1711 out: 1712 gfs2_qa_put(ndip); 1713 return error; 1714 } 1715 1716 /** 1717 * gfs2_exchange - exchange two files 1718 * @odir: Parent directory of old file name 1719 * @odentry: The old dentry of the file 1720 * @ndir: Parent directory of new file name 1721 * @ndentry: The new dentry of the file 1722 * @flags: The rename flags 1723 * 1724 * Returns: errno 1725 */ 1726 1727 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1728 struct inode *ndir, struct dentry *ndentry, 1729 unsigned int flags) 1730 { 1731 struct gfs2_inode *odip = GFS2_I(odir); 1732 struct gfs2_inode *ndip = GFS2_I(ndir); 1733 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1734 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1735 struct gfs2_sbd *sdp = GFS2_SB(odir); 1736 struct gfs2_holder ghs[4], r_gh; 1737 unsigned int num_gh; 1738 unsigned int x; 1739 umode_t old_mode = oip->i_inode.i_mode; 1740 umode_t new_mode = nip->i_inode.i_mode; 1741 int error; 1742 1743 gfs2_holder_mark_uninitialized(&r_gh); 1744 error = gfs2_rindex_update(sdp); 1745 if (error) 1746 return error; 1747 1748 if (odip != ndip) { 1749 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1750 0, &r_gh); 1751 if (error) 1752 goto out; 1753 1754 if (S_ISDIR(old_mode)) { 1755 /* don't move a directory into its subdir */ 1756 error = gfs2_ok_to_move(oip, ndip); 1757 if (error) 1758 goto out_gunlock_r; 1759 } 1760 1761 if (S_ISDIR(new_mode)) { 1762 /* don't move a directory into its subdir */ 1763 error = gfs2_ok_to_move(nip, odip); 1764 if (error) 1765 goto out_gunlock_r; 1766 } 1767 } 1768 1769 num_gh = 1; 1770 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1771 if (odip != ndip) { 1772 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1773 ghs + num_gh); 1774 num_gh++; 1775 } 1776 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1777 num_gh++; 1778 1779 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1780 num_gh++; 1781 1782 for (x = 0; x < num_gh; x++) { 1783 error = gfs2_glock_nq(ghs + x); 1784 if (error) 1785 goto out_gunlock; 1786 } 1787 1788 error = gfs2_glock_async_wait(num_gh, ghs); 1789 if (error) 1790 goto out_gunlock; 1791 1792 error = -ENOENT; 1793 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1794 goto out_gunlock; 1795 1796 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1797 if (error) 1798 goto out_gunlock; 1799 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1800 if (error) 1801 goto out_gunlock; 1802 1803 if (S_ISDIR(old_mode)) { 1804 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode, 1805 MAY_WRITE); 1806 if (error) 1807 goto out_gunlock; 1808 } 1809 if (S_ISDIR(new_mode)) { 1810 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode, 1811 MAY_WRITE); 1812 if (error) 1813 goto out_gunlock; 1814 } 1815 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1816 if (error) 1817 goto out_gunlock; 1818 1819 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1820 if (error) 1821 goto out_end_trans; 1822 1823 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1824 if (error) 1825 goto out_end_trans; 1826 1827 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1828 IF2DT(old_mode)); 1829 if (error) 1830 goto out_end_trans; 1831 1832 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1833 IF2DT(new_mode)); 1834 if (error) 1835 goto out_end_trans; 1836 1837 if (odip != ndip) { 1838 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1839 inc_nlink(&odip->i_inode); 1840 drop_nlink(&ndip->i_inode); 1841 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1842 inc_nlink(&ndip->i_inode); 1843 drop_nlink(&odip->i_inode); 1844 } 1845 } 1846 mark_inode_dirty(&ndip->i_inode); 1847 if (odip != ndip) 1848 mark_inode_dirty(&odip->i_inode); 1849 1850 out_end_trans: 1851 gfs2_trans_end(sdp); 1852 out_gunlock: 1853 while (x--) { 1854 if (gfs2_holder_queued(ghs + x)) 1855 gfs2_glock_dq(ghs + x); 1856 gfs2_holder_uninit(ghs + x); 1857 } 1858 out_gunlock_r: 1859 if (gfs2_holder_initialized(&r_gh)) 1860 gfs2_glock_dq_uninit(&r_gh); 1861 out: 1862 return error; 1863 } 1864 1865 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir, 1866 struct dentry *odentry, struct inode *ndir, 1867 struct dentry *ndentry, unsigned int flags) 1868 { 1869 flags &= ~RENAME_NOREPLACE; 1870 1871 if (flags & ~RENAME_EXCHANGE) 1872 return -EINVAL; 1873 1874 if (flags & RENAME_EXCHANGE) 1875 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1876 1877 return gfs2_rename(odir, odentry, ndir, ndentry); 1878 } 1879 1880 /** 1881 * gfs2_get_link - Follow a symbolic link 1882 * @dentry: The dentry of the link 1883 * @inode: The inode of the link 1884 * @done: destructor for return value 1885 * 1886 * This can handle symlinks of any size. 1887 * 1888 * Returns: 0 on success or error code 1889 */ 1890 1891 static const char *gfs2_get_link(struct dentry *dentry, 1892 struct inode *inode, 1893 struct delayed_call *done) 1894 { 1895 struct gfs2_inode *ip = GFS2_I(inode); 1896 struct gfs2_holder i_gh; 1897 struct buffer_head *dibh; 1898 unsigned int size; 1899 char *buf; 1900 int error; 1901 1902 if (!dentry) 1903 return ERR_PTR(-ECHILD); 1904 1905 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1906 error = gfs2_glock_nq(&i_gh); 1907 if (error) { 1908 gfs2_holder_uninit(&i_gh); 1909 return ERR_PTR(error); 1910 } 1911 1912 size = (unsigned int)i_size_read(&ip->i_inode); 1913 if (size == 0) { 1914 gfs2_consist_inode(ip); 1915 buf = ERR_PTR(-EIO); 1916 goto out; 1917 } 1918 1919 error = gfs2_meta_inode_buffer(ip, &dibh); 1920 if (error) { 1921 buf = ERR_PTR(error); 1922 goto out; 1923 } 1924 1925 buf = kzalloc(size + 1, GFP_NOFS); 1926 if (!buf) 1927 buf = ERR_PTR(-ENOMEM); 1928 else 1929 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1930 brelse(dibh); 1931 out: 1932 gfs2_glock_dq_uninit(&i_gh); 1933 if (!IS_ERR(buf)) 1934 set_delayed_call(done, kfree_link, buf); 1935 return buf; 1936 } 1937 1938 /** 1939 * gfs2_permission 1940 * @idmap: idmap of the mount the inode was found from 1941 * @inode: The inode 1942 * @mask: The mask to be tested 1943 * 1944 * This may be called from the VFS directly, or from within GFS2 with the 1945 * inode locked, so we look to see if the glock is already locked and only 1946 * lock the glock if its not already been done. 1947 * 1948 * Returns: errno 1949 */ 1950 1951 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode, 1952 int mask) 1953 { 1954 int may_not_block = mask & MAY_NOT_BLOCK; 1955 struct gfs2_inode *ip; 1956 struct gfs2_holder i_gh; 1957 struct gfs2_glock *gl; 1958 int error; 1959 1960 gfs2_holder_mark_uninitialized(&i_gh); 1961 ip = GFS2_I(inode); 1962 gl = rcu_dereference_check(ip->i_gl, !may_not_block); 1963 if (unlikely(!gl)) { 1964 /* inode is getting torn down, must be RCU mode */ 1965 WARN_ON_ONCE(!may_not_block); 1966 return -ECHILD; 1967 } 1968 if (gfs2_glock_is_locked_by_me(gl) == NULL) { 1969 if (may_not_block) 1970 return -ECHILD; 1971 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1972 if (error) 1973 return error; 1974 } 1975 1976 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1977 error = -EPERM; 1978 else 1979 error = generic_permission(&nop_mnt_idmap, inode, mask); 1980 if (gfs2_holder_initialized(&i_gh)) 1981 gfs2_glock_dq_uninit(&i_gh); 1982 1983 return error; 1984 } 1985 1986 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1987 { 1988 setattr_copy(&nop_mnt_idmap, inode, attr); 1989 mark_inode_dirty(inode); 1990 return 0; 1991 } 1992 1993 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1994 { 1995 int error; 1996 1997 if (current->journal_info) 1998 return __gfs2_setattr_simple(inode, attr); 1999 2000 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 2001 if (error) 2002 return error; 2003 2004 error = __gfs2_setattr_simple(inode, attr); 2005 gfs2_trans_end(GFS2_SB(inode)); 2006 return error; 2007 } 2008 2009 static int setattr_chown(struct inode *inode, struct iattr *attr) 2010 { 2011 struct gfs2_inode *ip = GFS2_I(inode); 2012 struct gfs2_sbd *sdp = GFS2_SB(inode); 2013 kuid_t ouid, nuid; 2014 kgid_t ogid, ngid; 2015 int error; 2016 struct gfs2_alloc_parms ap = {}; 2017 2018 ouid = inode->i_uid; 2019 ogid = inode->i_gid; 2020 nuid = attr->ia_uid; 2021 ngid = attr->ia_gid; 2022 2023 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 2024 ouid = nuid = NO_UID_QUOTA_CHANGE; 2025 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 2026 ogid = ngid = NO_GID_QUOTA_CHANGE; 2027 error = gfs2_qa_get(ip); 2028 if (error) 2029 return error; 2030 2031 error = gfs2_rindex_update(sdp); 2032 if (error) 2033 goto out; 2034 2035 error = gfs2_quota_lock(ip, nuid, ngid); 2036 if (error) 2037 goto out; 2038 2039 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 2040 2041 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 2042 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 2043 error = gfs2_quota_check(ip, nuid, ngid, &ap); 2044 if (error) 2045 goto out_gunlock_q; 2046 } 2047 2048 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 2049 if (error) 2050 goto out_gunlock_q; 2051 2052 error = gfs2_setattr_simple(inode, attr); 2053 if (error) 2054 goto out_end_trans; 2055 2056 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 2057 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 2058 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 2059 gfs2_quota_change(ip, ap.target, nuid, ngid); 2060 } 2061 2062 out_end_trans: 2063 gfs2_trans_end(sdp); 2064 out_gunlock_q: 2065 gfs2_quota_unlock(ip); 2066 out: 2067 gfs2_qa_put(ip); 2068 return error; 2069 } 2070 2071 /** 2072 * gfs2_setattr - Change attributes on an inode 2073 * @idmap: idmap of the mount the inode was found from 2074 * @dentry: The dentry which is changing 2075 * @attr: The structure describing the change 2076 * 2077 * The VFS layer wants to change one or more of an inodes attributes. Write 2078 * that change out to disk. 2079 * 2080 * Returns: errno 2081 */ 2082 2083 static int gfs2_setattr(struct mnt_idmap *idmap, 2084 struct dentry *dentry, struct iattr *attr) 2085 { 2086 struct inode *inode = d_inode(dentry); 2087 struct gfs2_inode *ip = GFS2_I(inode); 2088 struct gfs2_holder i_gh; 2089 int error; 2090 2091 error = gfs2_qa_get(ip); 2092 if (error) 2093 return error; 2094 2095 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 2096 if (error) 2097 goto out; 2098 2099 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid); 2100 if (error) 2101 goto error; 2102 2103 error = setattr_prepare(&nop_mnt_idmap, dentry, attr); 2104 if (error) 2105 goto error; 2106 2107 if (attr->ia_valid & ATTR_SIZE) 2108 error = gfs2_setattr_size(inode, attr->ia_size); 2109 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2110 error = setattr_chown(inode, attr); 2111 else { 2112 error = gfs2_setattr_simple(inode, attr); 2113 if (!error && attr->ia_valid & ATTR_MODE) 2114 error = posix_acl_chmod(&nop_mnt_idmap, dentry, 2115 inode->i_mode); 2116 } 2117 2118 error: 2119 if (!error) 2120 mark_inode_dirty(inode); 2121 gfs2_glock_dq_uninit(&i_gh); 2122 out: 2123 gfs2_qa_put(ip); 2124 return error; 2125 } 2126 2127 /** 2128 * gfs2_getattr - Read out an inode's attributes 2129 * @idmap: idmap of the mount the inode was found from 2130 * @path: Object to query 2131 * @stat: The inode's stats 2132 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2133 * @flags: AT_STATX_xxx setting 2134 * 2135 * This may be called from the VFS directly, or from within GFS2 with the 2136 * inode locked, so we look to see if the glock is already locked and only 2137 * lock the glock if its not already been done. Note that its the NFS 2138 * readdirplus operation which causes this to be called (from filldir) 2139 * with the glock already held. 2140 * 2141 * Returns: errno 2142 */ 2143 2144 static int gfs2_getattr(struct mnt_idmap *idmap, 2145 const struct path *path, struct kstat *stat, 2146 u32 request_mask, unsigned int flags) 2147 { 2148 struct inode *inode = d_inode(path->dentry); 2149 struct gfs2_inode *ip = GFS2_I(inode); 2150 struct gfs2_holder gh; 2151 u32 gfsflags; 2152 int error; 2153 2154 gfs2_holder_mark_uninitialized(&gh); 2155 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2156 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2157 if (error) 2158 return error; 2159 } 2160 2161 gfsflags = ip->i_diskflags; 2162 if (gfsflags & GFS2_DIF_APPENDONLY) 2163 stat->attributes |= STATX_ATTR_APPEND; 2164 if (gfsflags & GFS2_DIF_IMMUTABLE) 2165 stat->attributes |= STATX_ATTR_IMMUTABLE; 2166 2167 stat->attributes_mask |= (STATX_ATTR_APPEND | 2168 STATX_ATTR_COMPRESSED | 2169 STATX_ATTR_ENCRYPTED | 2170 STATX_ATTR_IMMUTABLE | 2171 STATX_ATTR_NODUMP); 2172 2173 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 2174 2175 if (gfs2_holder_initialized(&gh)) 2176 gfs2_glock_dq_uninit(&gh); 2177 2178 return 0; 2179 } 2180 2181 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2182 u64 start, u64 len) 2183 { 2184 struct gfs2_inode *ip = GFS2_I(inode); 2185 struct gfs2_holder gh; 2186 int ret; 2187 2188 inode_lock_shared(inode); 2189 2190 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2191 if (ret) 2192 goto out; 2193 2194 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2195 2196 gfs2_glock_dq_uninit(&gh); 2197 2198 out: 2199 inode_unlock_shared(inode); 2200 return ret; 2201 } 2202 2203 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2204 { 2205 struct inode *inode = file->f_mapping->host; 2206 struct gfs2_inode *ip = GFS2_I(inode); 2207 struct gfs2_holder gh; 2208 loff_t ret; 2209 2210 inode_lock_shared(inode); 2211 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2212 if (!ret) 2213 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2214 gfs2_glock_dq_uninit(&gh); 2215 inode_unlock_shared(inode); 2216 2217 if (ret < 0) 2218 return ret; 2219 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2220 } 2221 2222 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2223 { 2224 struct inode *inode = file->f_mapping->host; 2225 struct gfs2_inode *ip = GFS2_I(inode); 2226 struct gfs2_holder gh; 2227 loff_t ret; 2228 2229 inode_lock_shared(inode); 2230 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2231 if (!ret) 2232 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2233 gfs2_glock_dq_uninit(&gh); 2234 inode_unlock_shared(inode); 2235 2236 if (ret < 0) 2237 return ret; 2238 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2239 } 2240 2241 static int gfs2_update_time(struct inode *inode, int flags) 2242 { 2243 struct gfs2_inode *ip = GFS2_I(inode); 2244 struct gfs2_glock *gl = ip->i_gl; 2245 struct gfs2_holder *gh; 2246 int error; 2247 2248 gh = gfs2_glock_is_locked_by_me(gl); 2249 if (gh && gl->gl_state != LM_ST_EXCLUSIVE) { 2250 gfs2_glock_dq(gh); 2251 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2252 error = gfs2_glock_nq(gh); 2253 if (error) 2254 return error; 2255 } 2256 generic_update_time(inode, flags); 2257 return 0; 2258 } 2259 2260 static const struct inode_operations gfs2_file_iops = { 2261 .permission = gfs2_permission, 2262 .setattr = gfs2_setattr, 2263 .getattr = gfs2_getattr, 2264 .listxattr = gfs2_listxattr, 2265 .fiemap = gfs2_fiemap, 2266 .get_inode_acl = gfs2_get_acl, 2267 .set_acl = gfs2_set_acl, 2268 .update_time = gfs2_update_time, 2269 .fileattr_get = gfs2_fileattr_get, 2270 .fileattr_set = gfs2_fileattr_set, 2271 }; 2272 2273 static const struct inode_operations gfs2_dir_iops = { 2274 .create = gfs2_create, 2275 .lookup = gfs2_lookup, 2276 .link = gfs2_link, 2277 .unlink = gfs2_unlink, 2278 .symlink = gfs2_symlink, 2279 .mkdir = gfs2_mkdir, 2280 .rmdir = gfs2_unlink, 2281 .mknod = gfs2_mknod, 2282 .rename = gfs2_rename2, 2283 .permission = gfs2_permission, 2284 .setattr = gfs2_setattr, 2285 .getattr = gfs2_getattr, 2286 .listxattr = gfs2_listxattr, 2287 .fiemap = gfs2_fiemap, 2288 .get_inode_acl = gfs2_get_acl, 2289 .set_acl = gfs2_set_acl, 2290 .update_time = gfs2_update_time, 2291 .atomic_open = gfs2_atomic_open, 2292 .fileattr_get = gfs2_fileattr_get, 2293 .fileattr_set = gfs2_fileattr_set, 2294 }; 2295 2296 static const struct inode_operations gfs2_symlink_iops = { 2297 .get_link = gfs2_get_link, 2298 .permission = gfs2_permission, 2299 .setattr = gfs2_setattr, 2300 .getattr = gfs2_getattr, 2301 .listxattr = gfs2_listxattr, 2302 .fiemap = gfs2_fiemap, 2303 }; 2304 2305