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