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 void gfs2_setup_inode(struct inode *inode) 93 { 94 gfp_t gfp_mask; 95 96 /* 97 * Ensure all page cache allocations are done from GFP_NOFS context to 98 * prevent direct reclaim recursion back into the filesystem and blowing 99 * stacks or deadlocking. 100 */ 101 gfp_mask = mapping_gfp_mask(inode->i_mapping); 102 mapping_set_gfp_mask(inode->i_mapping, gfp_mask & ~__GFP_FS); 103 } 104 105 /** 106 * gfs2_inode_lookup - Lookup an inode 107 * @sb: The super block 108 * @type: The type of the inode 109 * @no_addr: The inode number 110 * @no_formal_ino: The inode generation number 111 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; 112 * GFS2_BLKST_FREE to indicate not to verify) 113 * 114 * If @type is DT_UNKNOWN, the inode type is fetched from disk. 115 * 116 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a 117 * placeholder because it doesn't otherwise make sense), the on-disk block type 118 * is verified to be @blktype. 119 * 120 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE) 121 * if it detects that @no_formal_ino doesn't match the actual inode generation 122 * number. However, it doesn't always know unless @type is DT_UNKNOWN. 123 * 124 * Returns: A VFS inode, or an error 125 */ 126 127 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 128 u64 no_addr, u64 no_formal_ino, 129 unsigned int blktype) 130 { 131 struct inode *inode; 132 struct gfs2_inode *ip; 133 struct gfs2_holder i_gh; 134 int error; 135 136 gfs2_holder_mark_uninitialized(&i_gh); 137 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr); 138 if (!inode) 139 return ERR_PTR(-ENOMEM); 140 141 ip = GFS2_I(inode); 142 143 if (inode_state_read_once(inode) & I_NEW) { 144 struct gfs2_sbd *sdp = GFS2_SB(inode); 145 struct gfs2_glock *io_gl; 146 int extra_flags = 0; 147 148 gfs2_setup_inode(inode); 149 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, 150 &ip->i_gl); 151 if (unlikely(error)) 152 goto fail; 153 154 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, 155 &io_gl); 156 if (unlikely(error)) 157 goto fail; 158 159 /* 160 * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is 161 * delete_work_func(). Make sure not to cancel the delete work 162 * from within itself here. 163 */ 164 if (blktype == GFS2_BLKST_UNLINKED) 165 extra_flags |= LM_FLAG_TRY; 166 else 167 gfs2_cancel_delete_work(io_gl); 168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, 169 GL_EXACT | GL_NOPID | extra_flags, 170 &ip->i_iopen_gh); 171 gfs2_glock_put(io_gl); 172 if (unlikely(error)) 173 goto fail; 174 175 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { 176 /* 177 * The GL_SKIP flag indicates to skip reading the inode 178 * block. We read the inode when instantiating it 179 * after possibly checking the block type. 180 */ 181 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 182 GL_SKIP, &i_gh); 183 if (error) 184 goto fail; 185 186 error = -ESTALE; 187 if (no_formal_ino && 188 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) 189 goto fail; 190 191 if (blktype != GFS2_BLKST_FREE) { 192 error = gfs2_check_blk_type(sdp, no_addr, 193 blktype); 194 if (error) 195 goto fail; 196 } 197 } 198 199 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags); 200 201 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ 202 inode_set_atime(inode, 203 1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1), 204 0); 205 206 glock_set_object(ip->i_gl, ip); 207 208 if (type == DT_UNKNOWN) { 209 /* Inode glock must be locked already */ 210 error = gfs2_instantiate(&i_gh); 211 if (error) { 212 glock_clear_object(ip->i_gl, ip); 213 goto fail; 214 } 215 } else { 216 ip->i_no_formal_ino = no_formal_ino; 217 inode->i_mode = DT2IF(type); 218 } 219 220 if (gfs2_holder_initialized(&i_gh)) 221 gfs2_glock_dq_uninit(&i_gh); 222 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 223 224 gfs2_set_iop(inode); 225 unlock_new_inode(inode); 226 } 227 228 if (no_formal_ino && ip->i_no_formal_ino && 229 no_formal_ino != ip->i_no_formal_ino) { 230 iput(inode); 231 return ERR_PTR(-ESTALE); 232 } 233 234 return inode; 235 236 fail: 237 if (error == GLR_TRYFAILED) 238 error = -EAGAIN; 239 if (gfs2_holder_initialized(&ip->i_iopen_gh)) 240 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 241 if (gfs2_holder_initialized(&i_gh)) 242 gfs2_glock_dq_uninit(&i_gh); 243 if (ip->i_gl) { 244 gfs2_glock_put(ip->i_gl); 245 ip->i_gl = NULL; 246 } 247 iget_failed(inode); 248 return ERR_PTR(error); 249 } 250 251 /** 252 * gfs2_lookup_by_inum - look up an inode by inode number 253 * @sdp: The super block 254 * @no_addr: The inode number 255 * @no_formal_ino: The inode generation number (0 for any) 256 * @blktype: Requested block type (see gfs2_inode_lookup) 257 */ 258 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 259 u64 no_formal_ino, unsigned int blktype) 260 { 261 struct super_block *sb = sdp->sd_vfs; 262 struct inode *inode; 263 int error; 264 265 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 266 blktype); 267 if (IS_ERR(inode)) 268 return inode; 269 270 if (no_formal_ino) { 271 error = -EIO; 272 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 273 goto fail_iput; 274 } 275 return inode; 276 277 fail_iput: 278 iput(inode); 279 return ERR_PTR(error); 280 } 281 282 283 /** 284 * gfs2_lookup_meta - Look up an inode in a metadata directory 285 * @dip: The directory 286 * @name: The name of the inode 287 */ 288 struct inode *gfs2_lookup_meta(struct inode *dip, const char *name) 289 { 290 struct qstr qstr; 291 struct inode *inode; 292 293 gfs2_str2qstr(&qstr, name); 294 inode = gfs2_lookupi(dip, &qstr, 1); 295 if (IS_ERR_OR_NULL(inode)) 296 return inode ? inode : ERR_PTR(-ENOENT); 297 298 /* 299 * Must not call back into the filesystem when allocating 300 * pages in the metadata inode's address space. 301 */ 302 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 303 304 return inode; 305 } 306 307 308 /** 309 * gfs2_lookupi - Look up a filename in a directory and return its inode 310 * @dir: The inode of the directory containing the inode to look-up 311 * @name: The name of the inode to look for 312 * @is_root: If 1, ignore the caller's permissions 313 * 314 * This can be called via the VFS filldir function when NFS is doing 315 * a readdirplus and the inode which its intending to stat isn't 316 * already in cache. In this case we must not take the directory glock 317 * again, since the readdir call will have already taken that lock. 318 * 319 * Returns: errno 320 */ 321 322 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 323 int is_root) 324 { 325 struct super_block *sb = dir->i_sb; 326 struct gfs2_inode *dip = GFS2_I(dir); 327 struct gfs2_holder d_gh; 328 int error = 0; 329 struct inode *inode = NULL; 330 331 gfs2_holder_mark_uninitialized(&d_gh); 332 if (!name->len || name->len > GFS2_FNAMESIZE) 333 return ERR_PTR(-ENAMETOOLONG); 334 335 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 336 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 337 dir == d_inode(sb->s_root))) { 338 igrab(dir); 339 return dir; 340 } 341 342 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 343 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 344 if (error) 345 return ERR_PTR(error); 346 } 347 348 if (!is_root) { 349 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC); 350 if (error) 351 goto out; 352 } 353 354 inode = gfs2_dir_search(dir, name, false); 355 if (IS_ERR(inode)) 356 error = PTR_ERR(inode); 357 out: 358 if (gfs2_holder_initialized(&d_gh)) 359 gfs2_glock_dq_uninit(&d_gh); 360 if (error == -ENOENT) 361 return NULL; 362 return inode ? inode : ERR_PTR(error); 363 } 364 365 /** 366 * create_ok - OK to create a new on-disk inode here? 367 * @dip: Directory in which dinode is to be created 368 * @name: Name of new dinode 369 * @mode: 370 * 371 * Returns: errno 372 */ 373 374 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 375 umode_t mode) 376 { 377 int error; 378 379 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 380 MAY_WRITE | MAY_EXEC); 381 if (error) 382 return error; 383 384 /* Don't create entries in an unlinked directory */ 385 if (!dip->i_inode.i_nlink) 386 return -ENOENT; 387 388 if (dip->i_entries == (u32)-1) 389 return -EFBIG; 390 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 391 return -EMLINK; 392 393 return 0; 394 } 395 396 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 397 struct inode *inode) 398 { 399 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 400 (dip->i_inode.i_mode & S_ISUID) && 401 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 402 if (S_ISDIR(inode->i_mode)) 403 inode->i_mode |= S_ISUID; 404 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 405 inode->i_mode &= ~07111; 406 inode->i_uid = dip->i_inode.i_uid; 407 } else 408 inode->i_uid = current_fsuid(); 409 410 if (dip->i_inode.i_mode & S_ISGID) { 411 if (S_ISDIR(inode->i_mode)) 412 inode->i_mode |= S_ISGID; 413 inode->i_gid = dip->i_inode.i_gid; 414 } else 415 inode->i_gid = current_fsgid(); 416 } 417 418 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 419 { 420 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 421 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 422 int error; 423 424 error = gfs2_quota_lock_check(ip, &ap); 425 if (error) 426 goto out; 427 428 error = gfs2_inplace_reserve(ip, &ap); 429 if (error) 430 goto out_quota; 431 432 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 433 if (error) 434 goto out_ipreserv; 435 436 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1); 437 if (error) 438 goto out_trans_end; 439 440 ip->i_no_formal_ino = ip->i_generation; 441 ip->i_inode.i_ino = ip->i_no_addr; 442 ip->i_goal = ip->i_no_addr; 443 if (*dblocks > 1) 444 ip->i_eattr = ip->i_no_addr + 1; 445 446 out_trans_end: 447 gfs2_trans_end(sdp); 448 out_ipreserv: 449 gfs2_inplace_release(ip); 450 out_quota: 451 gfs2_quota_unlock(ip); 452 out: 453 return error; 454 } 455 456 static void gfs2_final_release_pages(struct gfs2_inode *ip) 457 { 458 struct inode *inode = &ip->i_inode; 459 struct gfs2_glock *gl = ip->i_gl; 460 461 /* This can only happen during incomplete inode creation. */ 462 if (unlikely(!gl)) 463 return; 464 465 truncate_inode_pages(gfs2_glock2aspace(gl), 0); 466 truncate_inode_pages(&inode->i_data, 0); 467 468 if (atomic_read(&gl->gl_revokes) == 0) { 469 clear_bit(GLF_LFLUSH, &gl->gl_flags); 470 clear_bit(GLF_DIRTY, &gl->gl_flags); 471 } 472 } 473 474 int gfs2_dinode_dealloc(struct gfs2_inode *ip) 475 { 476 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 477 struct gfs2_rgrpd *rgd; 478 struct gfs2_holder gh; 479 int error; 480 481 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 482 gfs2_consist_inode(ip); 483 return -EIO; 484 } 485 486 gfs2_rindex_update(sdp); 487 488 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 489 if (error) 490 return error; 491 492 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 493 if (!rgd) { 494 gfs2_consist_inode(ip); 495 error = -EIO; 496 goto out_qs; 497 } 498 499 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 500 LM_FLAG_NODE_SCOPE, &gh); 501 if (error) 502 goto out_qs; 503 504 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 505 sdp->sd_jdesc->jd_blocks); 506 if (error) 507 goto out_rg_gunlock; 508 509 gfs2_free_di(rgd, ip); 510 511 gfs2_final_release_pages(ip); 512 513 gfs2_trans_end(sdp); 514 515 out_rg_gunlock: 516 gfs2_glock_dq_uninit(&gh); 517 out_qs: 518 gfs2_quota_unhold(ip); 519 return error; 520 } 521 522 static void gfs2_init_dir(struct buffer_head *dibh, 523 const struct gfs2_inode *parent) 524 { 525 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 526 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 527 528 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 529 dent->de_inum = di->di_num; /* already GFS2 endian */ 530 dent->de_type = cpu_to_be16(DT_DIR); 531 532 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 533 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 534 gfs2_inum_out(parent, dent); 535 dent->de_type = cpu_to_be16(DT_DIR); 536 537 } 538 539 /** 540 * gfs2_init_xattr - Initialise an xattr block for a new inode 541 * @ip: The inode in question 542 * 543 * This sets up an empty xattr block for a new inode, ready to 544 * take any ACLs, LSM xattrs, etc. 545 */ 546 547 static void gfs2_init_xattr(struct gfs2_inode *ip) 548 { 549 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 550 struct buffer_head *bh; 551 struct gfs2_ea_header *ea; 552 553 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 554 gfs2_trans_add_meta(ip->i_gl, bh); 555 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 556 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 557 558 ea = GFS2_EA_BH2FIRST(bh); 559 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 560 ea->ea_type = GFS2_EATYPE_UNUSED; 561 ea->ea_flags = GFS2_EAFLAG_LAST; 562 563 brelse(bh); 564 } 565 566 /** 567 * init_dinode - Fill in a new dinode structure 568 * @dip: The directory this inode is being created in 569 * @ip: The inode 570 * @symname: The symlink destination (if a symlink) 571 * 572 */ 573 574 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 575 const char *symname) 576 { 577 struct gfs2_dinode *di; 578 struct buffer_head *dibh; 579 580 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 581 gfs2_trans_add_meta(ip->i_gl, dibh); 582 di = (struct gfs2_dinode *)dibh->b_data; 583 gfs2_dinode_out(ip, di); 584 585 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 586 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 587 di->__pad1 = 0; 588 di->__pad2 = 0; 589 di->__pad3 = 0; 590 memset(&di->__pad4, 0, sizeof(di->__pad4)); 591 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 592 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 593 594 switch(ip->i_inode.i_mode & S_IFMT) { 595 case S_IFDIR: 596 gfs2_init_dir(dibh, dip); 597 break; 598 case S_IFLNK: 599 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 600 break; 601 } 602 603 set_buffer_uptodate(dibh); 604 brelse(dibh); 605 } 606 607 /** 608 * gfs2_trans_da_blks - Calculate number of blocks to link inode 609 * @dip: The directory we are linking into 610 * @da: The dir add information 611 * @nr_inodes: The number of inodes involved 612 * 613 * This calculate the number of blocks we need to reserve in a 614 * transaction to link @nr_inodes into a directory. In most cases 615 * @nr_inodes will be 2 (the directory plus the inode being linked in) 616 * but in case of rename, 4 may be required. 617 * 618 * Returns: Number of blocks 619 */ 620 621 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 622 const struct gfs2_diradd *da, 623 unsigned nr_inodes) 624 { 625 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 626 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 627 } 628 629 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 630 struct gfs2_inode *ip, struct gfs2_diradd *da) 631 { 632 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 633 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 634 int error; 635 636 if (da->nr_blocks) { 637 error = gfs2_quota_lock_check(dip, &ap); 638 if (error) 639 goto fail_quota_locks; 640 641 error = gfs2_inplace_reserve(dip, &ap); 642 if (error) 643 goto fail_quota_locks; 644 645 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 646 if (error) 647 goto fail_ipreserv; 648 } else { 649 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 650 if (error) 651 goto fail_quota_locks; 652 } 653 654 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 655 656 gfs2_trans_end(sdp); 657 fail_ipreserv: 658 gfs2_inplace_release(dip); 659 fail_quota_locks: 660 gfs2_quota_unlock(dip); 661 return error; 662 } 663 664 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 665 void *fs_info) 666 { 667 const struct xattr *xattr; 668 int err = 0; 669 670 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 671 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 672 xattr->value_len, 0, 673 GFS2_EATYPE_SECURITY); 674 if (err < 0) 675 break; 676 } 677 return err; 678 } 679 680 /** 681 * gfs2_create_inode - Create a new inode 682 * @dir: The parent directory 683 * @dentry: The new dentry 684 * @file: If non-NULL, the file which is being opened 685 * @mode: The permissions on the new inode 686 * @dev: For device nodes, this is the device number 687 * @symname: For symlinks, this is the link destination 688 * @size: The initial size of the inode (ignored for directories) 689 * @excl: Force fail if inode exists 690 * 691 * FIXME: Change to allocate the disk blocks and write them out in the same 692 * transaction. That way, we can no longer end up in a situation in which an 693 * inode is allocated, the node crashes, and the block looks like a valid 694 * inode. (With atomic creates in place, we will also no longer need to zero 695 * the link count and dirty the inode here on failure.) 696 * 697 * Returns: 0 on success, or error code 698 */ 699 700 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 701 struct file *file, 702 umode_t mode, dev_t dev, const char *symname, 703 unsigned int size, int excl) 704 { 705 const struct qstr *name = &dentry->d_name; 706 struct posix_acl *default_acl, *acl; 707 struct gfs2_holder d_gh, gh; 708 struct inode *inode = NULL; 709 struct gfs2_inode *dip = GFS2_I(dir), *ip; 710 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 711 struct gfs2_glock *io_gl; 712 int error, dealloc_error; 713 u32 aflags = 0; 714 unsigned blocks = 1; 715 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 716 bool xattr_initialized = false; 717 718 if (!name->len || name->len > GFS2_FNAMESIZE) 719 return -ENAMETOOLONG; 720 721 error = gfs2_qa_get(dip); 722 if (error) 723 return error; 724 725 error = gfs2_rindex_update(sdp); 726 if (error) 727 goto fail; 728 729 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 730 if (error) 731 goto fail; 732 gfs2_holder_mark_uninitialized(&gh); 733 734 error = create_ok(dip, name, mode); 735 if (error) 736 goto fail_gunlock; 737 738 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 739 error = PTR_ERR(inode); 740 if (!IS_ERR(inode)) { 741 if (S_ISDIR(inode->i_mode)) { 742 iput(inode); 743 inode = NULL; 744 error = -EISDIR; 745 goto fail_gunlock; 746 } 747 d_instantiate(dentry, inode); 748 error = 0; 749 if (file) { 750 if (S_ISREG(inode->i_mode)) 751 error = finish_open(file, dentry, gfs2_open_common); 752 else 753 error = finish_no_open(file, NULL); 754 } 755 gfs2_glock_dq_uninit(&d_gh); 756 goto fail; 757 } else if (error != -ENOENT) { 758 goto fail_gunlock; 759 } 760 761 error = gfs2_diradd_alloc_required(dir, name, &da); 762 if (error < 0) 763 goto fail_gunlock; 764 765 inode = new_inode(sdp->sd_vfs); 766 error = -ENOMEM; 767 if (!inode) 768 goto fail_gunlock; 769 gfs2_setup_inode(inode); 770 ip = GFS2_I(inode); 771 772 error = posix_acl_create(dir, &mode, &default_acl, &acl); 773 if (error) 774 goto fail_gunlock; 775 776 error = gfs2_qa_get(ip); 777 if (error) 778 goto fail_free_acls; 779 780 inode->i_mode = mode; 781 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 782 inode->i_rdev = dev; 783 inode->i_size = size; 784 simple_inode_init_ts(inode); 785 munge_mode_uid_gid(dip, inode); 786 check_and_update_goal(dip); 787 ip->i_goal = dip->i_goal; 788 ip->i_diskflags = 0; 789 ip->i_eattr = 0; 790 ip->i_height = 0; 791 ip->i_depth = 0; 792 ip->i_entries = 0; 793 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 794 795 switch(mode & S_IFMT) { 796 case S_IFREG: 797 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 798 gfs2_tune_get(sdp, gt_new_files_jdata)) 799 ip->i_diskflags |= GFS2_DIF_JDATA; 800 gfs2_set_aops(inode); 801 break; 802 case S_IFDIR: 803 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 804 ip->i_diskflags |= GFS2_DIF_JDATA; 805 ip->i_entries = 2; 806 break; 807 } 808 809 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 810 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 811 ip->i_diskflags |= GFS2_DIF_SYSTEM; 812 813 gfs2_set_inode_flags(inode); 814 815 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 816 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 817 aflags |= GFS2_AF_ORLOV; 818 819 if (default_acl || acl) 820 blocks++; 821 822 error = alloc_dinode(ip, aflags, &blocks); 823 if (error) 824 goto fail_free_inode; 825 826 gfs2_set_inode_blocks(inode, blocks); 827 828 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 829 if (error) 830 goto fail_dealloc_inode; 831 832 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 833 if (error) 834 goto fail_dealloc_inode; 835 gfs2_cancel_delete_work(io_gl); 836 io_gl->gl_no_formal_ino = ip->i_no_formal_ino; 837 838 retry: 839 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); 840 if (error == -EBUSY) 841 goto retry; 842 if (error) 843 goto fail_gunlock2; 844 845 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID, 846 &ip->i_iopen_gh); 847 if (error) 848 goto fail_gunlock2; 849 850 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 851 if (error) 852 goto fail_gunlock3; 853 clear_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags); 854 855 error = gfs2_trans_begin(sdp, blocks, 0); 856 if (error) 857 goto fail_gunlock3; 858 859 if (blocks > 1) { 860 gfs2_init_xattr(ip); 861 xattr_initialized = true; 862 } 863 init_dinode(dip, ip, symname); 864 gfs2_trans_end(sdp); 865 866 glock_set_object(ip->i_gl, ip); 867 glock_set_object(io_gl, ip); 868 gfs2_set_iop(inode); 869 870 if (default_acl) { 871 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 872 if (error) 873 goto fail_gunlock4; 874 posix_acl_release(default_acl); 875 default_acl = NULL; 876 } 877 if (acl) { 878 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 879 if (error) 880 goto fail_gunlock4; 881 posix_acl_release(acl); 882 acl = NULL; 883 } 884 885 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 886 &gfs2_initxattrs, NULL); 887 if (error) 888 goto fail_gunlock4; 889 890 error = link_dinode(dip, name, ip, &da); 891 if (error) 892 goto fail_gunlock4; 893 894 mark_inode_dirty(inode); 895 d_instantiate_new(dentry, inode); 896 /* After instantiate, errors should result in evict which will destroy 897 * both inode and iopen glocks properly. */ 898 if (file) { 899 file->f_mode |= FMODE_CREATED; 900 error = finish_open(file, dentry, gfs2_open_common); 901 } 902 gfs2_glock_dq_uninit(&d_gh); 903 gfs2_qa_put(ip); 904 gfs2_glock_dq_uninit(&gh); 905 gfs2_glock_put(io_gl); 906 gfs2_qa_put(dip); 907 return error; 908 909 fail_gunlock4: 910 glock_clear_object(ip->i_gl, ip); 911 glock_clear_object(io_gl, ip); 912 fail_gunlock3: 913 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 914 fail_gunlock2: 915 gfs2_glock_put(io_gl); 916 fail_dealloc_inode: 917 dealloc_error = 0; 918 if (ip->i_eattr) 919 dealloc_error = gfs2_ea_dealloc(ip, xattr_initialized); 920 clear_nlink(inode); 921 mark_inode_dirty(inode); 922 if (!dealloc_error) 923 dealloc_error = gfs2_dinode_dealloc(ip); 924 if (dealloc_error) 925 fs_warn(sdp, "%s: %d\n", __func__, dealloc_error); 926 ip->i_no_addr = 0; 927 fail_free_inode: 928 if (ip->i_gl) { 929 gfs2_glock_put(ip->i_gl); 930 ip->i_gl = NULL; 931 } 932 gfs2_rs_deltree(&ip->i_res); 933 gfs2_qa_put(ip); 934 fail_free_acls: 935 posix_acl_release(default_acl); 936 posix_acl_release(acl); 937 fail_gunlock: 938 gfs2_dir_no_add(&da); 939 gfs2_glock_dq_uninit(&d_gh); 940 if (!IS_ERR_OR_NULL(inode)) { 941 if (inode_state_read_once(inode) & I_NEW) 942 iget_failed(inode); 943 else 944 iput(inode); 945 } 946 if (gfs2_holder_initialized(&gh)) 947 gfs2_glock_dq_uninit(&gh); 948 fail: 949 gfs2_qa_put(dip); 950 return error; 951 } 952 953 /** 954 * gfs2_create - Create a file 955 * @idmap: idmap of the mount the inode was found from 956 * @dir: The directory in which to create the file 957 * @dentry: The dentry of the new file 958 * @mode: The mode of the new file 959 * @excl: Force fail if inode exists 960 * 961 * Returns: errno 962 */ 963 964 static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir, 965 struct dentry *dentry, umode_t mode, bool excl) 966 { 967 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 968 } 969 970 /** 971 * __gfs2_lookup - Look up a filename in a directory and return its inode 972 * @dir: The directory inode 973 * @dentry: The dentry of the new inode 974 * @file: File to be opened 975 * 976 * 977 * Returns: errno 978 */ 979 980 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 981 struct file *file) 982 { 983 struct inode *inode; 984 struct dentry *d; 985 struct gfs2_holder gh; 986 struct gfs2_glock *gl; 987 int error; 988 989 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 990 if (inode == NULL) { 991 d_add(dentry, NULL); 992 return NULL; 993 } 994 if (IS_ERR(inode)) 995 return ERR_CAST(inode); 996 997 gl = GFS2_I(inode)->i_gl; 998 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 999 if (error) { 1000 iput(inode); 1001 return ERR_PTR(error); 1002 } 1003 1004 d = d_splice_alias(inode, dentry); 1005 if (IS_ERR(d)) { 1006 gfs2_glock_dq_uninit(&gh); 1007 return d; 1008 } 1009 if (file && S_ISREG(inode->i_mode)) 1010 error = finish_open(file, dentry, gfs2_open_common); 1011 1012 gfs2_glock_dq_uninit(&gh); 1013 if (error) { 1014 dput(d); 1015 return ERR_PTR(error); 1016 } 1017 return d; 1018 } 1019 1020 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 1021 unsigned flags) 1022 { 1023 return __gfs2_lookup(dir, dentry, NULL); 1024 } 1025 1026 /** 1027 * gfs2_link - Link to a file 1028 * @old_dentry: The inode to link 1029 * @dir: Add link to this directory 1030 * @dentry: The name of the link 1031 * 1032 * Link the inode in "old_dentry" into the directory "dir" with the 1033 * name in "dentry". 1034 * 1035 * Returns: errno 1036 */ 1037 1038 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 1039 struct dentry *dentry) 1040 { 1041 struct gfs2_inode *dip = GFS2_I(dir); 1042 struct gfs2_sbd *sdp = GFS2_SB(dir); 1043 struct inode *inode = d_inode(old_dentry); 1044 struct gfs2_inode *ip = GFS2_I(inode); 1045 struct gfs2_holder d_gh, gh; 1046 struct buffer_head *dibh; 1047 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 1048 int error; 1049 1050 if (S_ISDIR(inode->i_mode)) 1051 return -EPERM; 1052 1053 error = gfs2_qa_get(dip); 1054 if (error) 1055 return error; 1056 1057 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1058 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1059 1060 error = gfs2_glock_nq(&d_gh); 1061 if (error) 1062 goto out_parent; 1063 1064 error = gfs2_glock_nq(&gh); 1065 if (error) 1066 goto out_child; 1067 1068 error = -ENOENT; 1069 if (inode->i_nlink == 0) 1070 goto out_gunlock; 1071 1072 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC); 1073 if (error) 1074 goto out_gunlock; 1075 1076 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 1077 switch (error) { 1078 case -ENOENT: 1079 break; 1080 case 0: 1081 error = -EEXIST; 1082 goto out_gunlock; 1083 default: 1084 goto out_gunlock; 1085 } 1086 1087 error = -EINVAL; 1088 if (!dip->i_inode.i_nlink) 1089 goto out_gunlock; 1090 error = -EFBIG; 1091 if (dip->i_entries == (u32)-1) 1092 goto out_gunlock; 1093 error = -EPERM; 1094 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1095 goto out_gunlock; 1096 error = -EMLINK; 1097 if (ip->i_inode.i_nlink == (u32)-1) 1098 goto out_gunlock; 1099 1100 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 1101 if (error < 0) 1102 goto out_gunlock; 1103 1104 if (da.nr_blocks) { 1105 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1106 error = gfs2_quota_lock_check(dip, &ap); 1107 if (error) 1108 goto out_gunlock; 1109 1110 error = gfs2_inplace_reserve(dip, &ap); 1111 if (error) 1112 goto out_gunlock_q; 1113 1114 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1115 if (error) 1116 goto out_ipres; 1117 } else { 1118 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1119 if (error) 1120 goto out_ipres; 1121 } 1122 1123 error = gfs2_meta_inode_buffer(ip, &dibh); 1124 if (error) 1125 goto out_end_trans; 1126 1127 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1128 if (error) 1129 goto out_brelse; 1130 1131 gfs2_trans_add_meta(ip->i_gl, dibh); 1132 inc_nlink(&ip->i_inode); 1133 inode_set_ctime_current(&ip->i_inode); 1134 ihold(inode); 1135 d_instantiate(dentry, inode); 1136 mark_inode_dirty(inode); 1137 1138 out_brelse: 1139 brelse(dibh); 1140 out_end_trans: 1141 gfs2_trans_end(sdp); 1142 out_ipres: 1143 if (da.nr_blocks) 1144 gfs2_inplace_release(dip); 1145 out_gunlock_q: 1146 if (da.nr_blocks) 1147 gfs2_quota_unlock(dip); 1148 out_gunlock: 1149 gfs2_dir_no_add(&da); 1150 gfs2_glock_dq(&gh); 1151 out_child: 1152 gfs2_glock_dq(&d_gh); 1153 out_parent: 1154 gfs2_qa_put(dip); 1155 gfs2_holder_uninit(&d_gh); 1156 gfs2_holder_uninit(&gh); 1157 return error; 1158 } 1159 1160 /* 1161 * gfs2_unlink_ok - check to see that a inode is still in a directory 1162 * @dip: the directory 1163 * @name: the name of the file 1164 * @ip: the inode 1165 * 1166 * Assumes that the lock on (at least) @dip is held. 1167 * 1168 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1169 */ 1170 1171 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1172 const struct gfs2_inode *ip) 1173 { 1174 int error; 1175 1176 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1177 return -EPERM; 1178 1179 if ((dip->i_inode.i_mode & S_ISVTX) && 1180 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1181 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1182 return -EPERM; 1183 1184 if (IS_APPEND(&dip->i_inode)) 1185 return -EPERM; 1186 1187 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 1188 MAY_WRITE | MAY_EXEC); 1189 if (error) 1190 return error; 1191 1192 return gfs2_dir_check(&dip->i_inode, name, ip); 1193 } 1194 1195 /** 1196 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1197 * @dip: The parent directory 1198 * @dentry: The dentry to unlink 1199 * 1200 * Called with all the locks and in a transaction. This will only be 1201 * called for a directory after it has been checked to ensure it is empty. 1202 * 1203 * Returns: 0 on success, or an error 1204 */ 1205 1206 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1207 const struct dentry *dentry) 1208 { 1209 struct inode *inode = d_inode(dentry); 1210 struct gfs2_inode *ip = GFS2_I(inode); 1211 int error; 1212 1213 error = gfs2_dir_del(dip, dentry); 1214 if (error) 1215 return error; 1216 1217 ip->i_entries = 0; 1218 inode_set_ctime_current(inode); 1219 if (S_ISDIR(inode->i_mode)) 1220 clear_nlink(inode); 1221 else 1222 drop_nlink(inode); 1223 mark_inode_dirty(inode); 1224 if (inode->i_nlink == 0) 1225 gfs2_unlink_di(inode); 1226 return 0; 1227 } 1228 1229 1230 /** 1231 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1232 * @dir: The inode of the directory containing the inode to unlink 1233 * @dentry: The file itself 1234 * 1235 * This routine uses the type of the inode as a flag to figure out 1236 * whether this is an unlink or an rmdir. 1237 * 1238 * Returns: errno 1239 */ 1240 1241 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1242 { 1243 struct gfs2_inode *dip = GFS2_I(dir); 1244 struct gfs2_sbd *sdp = GFS2_SB(dir); 1245 struct inode *inode = d_inode(dentry); 1246 struct gfs2_inode *ip = GFS2_I(inode); 1247 struct gfs2_holder d_gh, r_gh, gh; 1248 struct gfs2_rgrpd *rgd; 1249 int error; 1250 1251 error = gfs2_rindex_update(sdp); 1252 if (error) 1253 return error; 1254 1255 error = -EROFS; 1256 1257 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1258 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1259 1260 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1261 if (!rgd) 1262 goto out_inodes; 1263 1264 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh); 1265 1266 1267 error = gfs2_glock_nq(&d_gh); 1268 if (error) 1269 goto out_parent; 1270 1271 error = gfs2_glock_nq(&gh); 1272 if (error) 1273 goto out_child; 1274 1275 error = -ENOENT; 1276 if (inode->i_nlink == 0) 1277 goto out_rgrp; 1278 1279 if (S_ISDIR(inode->i_mode)) { 1280 error = -ENOTEMPTY; 1281 if (ip->i_entries > 2 || inode->i_nlink > 2) 1282 goto out_rgrp; 1283 } 1284 1285 error = gfs2_glock_nq(&r_gh); /* rgrp */ 1286 if (error) 1287 goto out_rgrp; 1288 1289 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1290 if (error) 1291 goto out_gunlock; 1292 1293 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1294 if (error) 1295 goto out_gunlock; 1296 1297 error = gfs2_unlink_inode(dip, dentry); 1298 gfs2_trans_end(sdp); 1299 1300 out_gunlock: 1301 gfs2_glock_dq(&r_gh); 1302 out_rgrp: 1303 gfs2_glock_dq(&gh); 1304 out_child: 1305 gfs2_glock_dq(&d_gh); 1306 out_parent: 1307 gfs2_holder_uninit(&r_gh); 1308 out_inodes: 1309 gfs2_holder_uninit(&gh); 1310 gfs2_holder_uninit(&d_gh); 1311 return error; 1312 } 1313 1314 /** 1315 * gfs2_symlink - Create a symlink 1316 * @idmap: idmap of the mount the inode was found from 1317 * @dir: The directory to create the symlink in 1318 * @dentry: The dentry to put the symlink in 1319 * @symname: The thing which the link points to 1320 * 1321 * Returns: errno 1322 */ 1323 1324 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir, 1325 struct dentry *dentry, const char *symname) 1326 { 1327 unsigned int size; 1328 1329 size = strlen(symname); 1330 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1331 return -ENAMETOOLONG; 1332 1333 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1334 } 1335 1336 /** 1337 * gfs2_mkdir - Make a directory 1338 * @idmap: idmap of the mount the inode was found from 1339 * @dir: The parent directory of the new one 1340 * @dentry: The dentry of the new directory 1341 * @mode: The mode of the new directory 1342 * 1343 * Returns: the dentry, or ERR_PTR(errno) 1344 */ 1345 1346 static struct dentry *gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1347 struct dentry *dentry, umode_t mode) 1348 { 1349 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1350 1351 return ERR_PTR(gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0)); 1352 } 1353 1354 /** 1355 * gfs2_mknod - Make a special file 1356 * @idmap: idmap of the mount the inode was found from 1357 * @dir: The directory in which the special file will reside 1358 * @dentry: The dentry of the special file 1359 * @mode: The mode of the special file 1360 * @dev: The device specification of the special file 1361 * 1362 */ 1363 1364 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir, 1365 struct dentry *dentry, umode_t mode, dev_t dev) 1366 { 1367 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1368 } 1369 1370 /** 1371 * gfs2_atomic_open - Atomically open a file 1372 * @dir: The directory 1373 * @dentry: The proposed new entry 1374 * @file: The proposed new struct file 1375 * @flags: open flags 1376 * @mode: File mode 1377 * 1378 * Returns: error code or 0 for success 1379 */ 1380 1381 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1382 struct file *file, unsigned flags, 1383 umode_t mode) 1384 { 1385 bool excl = !!(flags & O_EXCL); 1386 1387 if (d_in_lookup(dentry)) { 1388 struct dentry *d = __gfs2_lookup(dir, dentry, file); 1389 if (file->f_mode & FMODE_OPENED) { 1390 if (IS_ERR(d)) 1391 return PTR_ERR(d); 1392 dput(d); 1393 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1394 } 1395 if (d || d_really_is_positive(dentry)) 1396 return finish_no_open(file, d); 1397 } 1398 if (!(flags & O_CREAT)) 1399 return -ENOENT; 1400 1401 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1402 } 1403 1404 /* 1405 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1406 * @this: move this 1407 * @to: to here 1408 * 1409 * Follow @to back to the root and make sure we don't encounter @this 1410 * Assumes we already hold the rename lock. 1411 * 1412 * Returns: errno 1413 */ 1414 1415 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1416 { 1417 struct inode *dir = &to->i_inode; 1418 struct super_block *sb = dir->i_sb; 1419 struct inode *tmp; 1420 int error = 0; 1421 1422 igrab(dir); 1423 1424 for (;;) { 1425 if (dir == &this->i_inode) { 1426 error = -EINVAL; 1427 break; 1428 } 1429 if (dir == d_inode(sb->s_root)) { 1430 error = 0; 1431 break; 1432 } 1433 1434 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1435 if (!tmp) { 1436 error = -ENOENT; 1437 break; 1438 } 1439 if (IS_ERR(tmp)) { 1440 error = PTR_ERR(tmp); 1441 break; 1442 } 1443 1444 iput(dir); 1445 dir = tmp; 1446 } 1447 1448 iput(dir); 1449 1450 return error; 1451 } 1452 1453 /** 1454 * update_moved_ino - Update an inode that's being moved 1455 * @ip: The inode being moved 1456 * @ndip: The parent directory of the new filename 1457 * @dir_rename: True of ip is a directory 1458 * 1459 * Returns: errno 1460 */ 1461 1462 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1463 int dir_rename) 1464 { 1465 if (dir_rename) 1466 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1467 1468 inode_set_ctime_current(&ip->i_inode); 1469 mark_inode_dirty_sync(&ip->i_inode); 1470 return 0; 1471 } 1472 1473 1474 /** 1475 * gfs2_rename - Rename a file 1476 * @odir: Parent directory of old file name 1477 * @odentry: The old dentry of the file 1478 * @ndir: Parent directory of new file name 1479 * @ndentry: The new dentry of the file 1480 * 1481 * Returns: errno 1482 */ 1483 1484 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1485 struct inode *ndir, struct dentry *ndentry) 1486 { 1487 struct gfs2_inode *odip = GFS2_I(odir); 1488 struct gfs2_inode *ndip = GFS2_I(ndir); 1489 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1490 struct gfs2_inode *nip = NULL; 1491 struct gfs2_sbd *sdp = GFS2_SB(odir); 1492 struct gfs2_holder ghs[4], r_gh, rd_gh; 1493 struct gfs2_rgrpd *nrgd; 1494 unsigned int num_gh; 1495 int dir_rename = 0; 1496 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1497 unsigned int retries = 0, x; 1498 int error; 1499 1500 gfs2_holder_mark_uninitialized(&r_gh); 1501 gfs2_holder_mark_uninitialized(&rd_gh); 1502 if (d_really_is_positive(ndentry)) { 1503 nip = GFS2_I(d_inode(ndentry)); 1504 if (ip == nip) 1505 return 0; 1506 } 1507 1508 error = gfs2_rindex_update(sdp); 1509 if (error) 1510 return error; 1511 1512 error = gfs2_qa_get(ndip); 1513 if (error) 1514 return error; 1515 1516 if (odip != ndip) { 1517 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1518 0, &r_gh); 1519 if (error) 1520 goto out; 1521 1522 if (S_ISDIR(ip->i_inode.i_mode)) { 1523 dir_rename = 1; 1524 /* don't move a directory into its subdir */ 1525 error = gfs2_ok_to_move(ip, ndip); 1526 if (error) 1527 goto out_gunlock_r; 1528 } 1529 } 1530 1531 num_gh = 1; 1532 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1533 if (odip != ndip) { 1534 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1535 ghs + num_gh); 1536 num_gh++; 1537 } 1538 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1539 num_gh++; 1540 1541 if (nip) { 1542 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1543 ghs + num_gh); 1544 num_gh++; 1545 } 1546 1547 again: 1548 for (x = 0; x < num_gh; x++) { 1549 error = gfs2_glock_nq(ghs + x); 1550 if (error) 1551 goto out_gunlock; 1552 } 1553 error = gfs2_glock_async_wait(num_gh, ghs, retries); 1554 if (error == -ESTALE) { 1555 retries++; 1556 goto again; 1557 } 1558 if (error) 1559 goto out_gunlock; 1560 1561 if (nip) { 1562 /* Grab the resource group glock for unlink flag twiddling. 1563 * This is the case where the target dinode already exists 1564 * so we unlink before doing the rename. 1565 */ 1566 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1567 if (!nrgd) { 1568 error = -ENOENT; 1569 goto out_gunlock; 1570 } 1571 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1572 LM_FLAG_NODE_SCOPE, &rd_gh); 1573 if (error) 1574 goto out_gunlock; 1575 } 1576 1577 error = -ENOENT; 1578 if (ip->i_inode.i_nlink == 0) 1579 goto out_gunlock; 1580 1581 /* Check out the old directory */ 1582 1583 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1584 if (error) 1585 goto out_gunlock; 1586 1587 /* Check out the new directory */ 1588 1589 if (nip) { 1590 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1591 if (error) 1592 goto out_gunlock; 1593 1594 if (nip->i_inode.i_nlink == 0) { 1595 error = -EAGAIN; 1596 goto out_gunlock; 1597 } 1598 1599 if (S_ISDIR(nip->i_inode.i_mode)) { 1600 if (nip->i_entries < 2) { 1601 gfs2_consist_inode(nip); 1602 error = -EIO; 1603 goto out_gunlock; 1604 } 1605 if (nip->i_entries > 2) { 1606 error = -ENOTEMPTY; 1607 goto out_gunlock; 1608 } 1609 } 1610 } else { 1611 error = gfs2_permission(&nop_mnt_idmap, ndir, 1612 MAY_WRITE | MAY_EXEC); 1613 if (error) 1614 goto out_gunlock; 1615 1616 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1617 switch (error) { 1618 case -ENOENT: 1619 error = 0; 1620 break; 1621 case 0: 1622 error = -EEXIST; 1623 goto out_gunlock; 1624 default: 1625 goto out_gunlock; 1626 } 1627 1628 if (odip != ndip) { 1629 if (!ndip->i_inode.i_nlink) { 1630 error = -ENOENT; 1631 goto out_gunlock; 1632 } 1633 if (ndip->i_entries == (u32)-1) { 1634 error = -EFBIG; 1635 goto out_gunlock; 1636 } 1637 if (S_ISDIR(ip->i_inode.i_mode) && 1638 ndip->i_inode.i_nlink == (u32)-1) { 1639 error = -EMLINK; 1640 goto out_gunlock; 1641 } 1642 } 1643 } 1644 1645 /* Check out the dir to be renamed */ 1646 1647 if (dir_rename) { 1648 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry), 1649 MAY_WRITE); 1650 if (error) 1651 goto out_gunlock; 1652 } 1653 1654 if (nip == NULL) { 1655 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1656 if (error) 1657 goto out_gunlock; 1658 } 1659 1660 if (da.nr_blocks) { 1661 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1662 error = gfs2_quota_lock_check(ndip, &ap); 1663 if (error) 1664 goto out_gunlock; 1665 1666 error = gfs2_inplace_reserve(ndip, &ap); 1667 if (error) 1668 goto out_gunlock_q; 1669 1670 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1671 4 * RES_LEAF + 4, 0); 1672 if (error) 1673 goto out_ipreserv; 1674 } else { 1675 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1676 5 * RES_LEAF + 4, 0); 1677 if (error) 1678 goto out_gunlock; 1679 } 1680 1681 /* Remove the target file, if it exists */ 1682 1683 if (nip) 1684 error = gfs2_unlink_inode(ndip, ndentry); 1685 1686 error = update_moved_ino(ip, ndip, dir_rename); 1687 if (error) 1688 goto out_end_trans; 1689 1690 error = gfs2_dir_del(odip, odentry); 1691 if (error) 1692 goto out_end_trans; 1693 1694 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1695 if (error) 1696 goto out_end_trans; 1697 1698 out_end_trans: 1699 gfs2_trans_end(sdp); 1700 out_ipreserv: 1701 if (da.nr_blocks) 1702 gfs2_inplace_release(ndip); 1703 out_gunlock_q: 1704 if (da.nr_blocks) 1705 gfs2_quota_unlock(ndip); 1706 out_gunlock: 1707 gfs2_dir_no_add(&da); 1708 if (gfs2_holder_initialized(&rd_gh)) 1709 gfs2_glock_dq_uninit(&rd_gh); 1710 1711 while (x--) { 1712 if (gfs2_holder_queued(ghs + x)) 1713 gfs2_glock_dq(ghs + x); 1714 gfs2_holder_uninit(ghs + x); 1715 } 1716 out_gunlock_r: 1717 if (gfs2_holder_initialized(&r_gh)) 1718 gfs2_glock_dq_uninit(&r_gh); 1719 out: 1720 gfs2_qa_put(ndip); 1721 return error; 1722 } 1723 1724 /** 1725 * gfs2_exchange - exchange two files 1726 * @odir: Parent directory of old file name 1727 * @odentry: The old dentry of the file 1728 * @ndir: Parent directory of new file name 1729 * @ndentry: The new dentry of the file 1730 * @flags: The rename flags 1731 * 1732 * Returns: errno 1733 */ 1734 1735 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1736 struct inode *ndir, struct dentry *ndentry, 1737 unsigned int flags) 1738 { 1739 struct gfs2_inode *odip = GFS2_I(odir); 1740 struct gfs2_inode *ndip = GFS2_I(ndir); 1741 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1742 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1743 struct gfs2_sbd *sdp = GFS2_SB(odir); 1744 struct gfs2_holder ghs[4], r_gh; 1745 unsigned int num_gh; 1746 unsigned int retries = 0, x; 1747 umode_t old_mode = oip->i_inode.i_mode; 1748 umode_t new_mode = nip->i_inode.i_mode; 1749 int error; 1750 1751 gfs2_holder_mark_uninitialized(&r_gh); 1752 error = gfs2_rindex_update(sdp); 1753 if (error) 1754 return error; 1755 1756 if (odip != ndip) { 1757 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1758 0, &r_gh); 1759 if (error) 1760 goto out; 1761 1762 if (S_ISDIR(old_mode)) { 1763 /* don't move a directory into its subdir */ 1764 error = gfs2_ok_to_move(oip, ndip); 1765 if (error) 1766 goto out_gunlock_r; 1767 } 1768 1769 if (S_ISDIR(new_mode)) { 1770 /* don't move a directory into its subdir */ 1771 error = gfs2_ok_to_move(nip, odip); 1772 if (error) 1773 goto out_gunlock_r; 1774 } 1775 } 1776 1777 num_gh = 1; 1778 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1779 if (odip != ndip) { 1780 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1781 ghs + num_gh); 1782 num_gh++; 1783 } 1784 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1785 num_gh++; 1786 1787 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1788 num_gh++; 1789 1790 again: 1791 for (x = 0; x < num_gh; x++) { 1792 error = gfs2_glock_nq(ghs + x); 1793 if (error) 1794 goto out_gunlock; 1795 } 1796 1797 error = gfs2_glock_async_wait(num_gh, ghs, retries); 1798 if (error == -ESTALE) { 1799 retries++; 1800 goto again; 1801 } 1802 if (error) 1803 goto out_gunlock; 1804 1805 error = -ENOENT; 1806 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1807 goto out_gunlock; 1808 1809 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1810 if (error) 1811 goto out_gunlock; 1812 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1813 if (error) 1814 goto out_gunlock; 1815 1816 if (S_ISDIR(old_mode)) { 1817 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode, 1818 MAY_WRITE); 1819 if (error) 1820 goto out_gunlock; 1821 } 1822 if (S_ISDIR(new_mode)) { 1823 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode, 1824 MAY_WRITE); 1825 if (error) 1826 goto out_gunlock; 1827 } 1828 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1829 if (error) 1830 goto out_gunlock; 1831 1832 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1833 if (error) 1834 goto out_end_trans; 1835 1836 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1837 if (error) 1838 goto out_end_trans; 1839 1840 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1841 IF2DT(old_mode)); 1842 if (error) 1843 goto out_end_trans; 1844 1845 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1846 IF2DT(new_mode)); 1847 if (error) 1848 goto out_end_trans; 1849 1850 if (odip != ndip) { 1851 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1852 inc_nlink(&odip->i_inode); 1853 drop_nlink(&ndip->i_inode); 1854 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1855 inc_nlink(&ndip->i_inode); 1856 drop_nlink(&odip->i_inode); 1857 } 1858 } 1859 mark_inode_dirty(&ndip->i_inode); 1860 if (odip != ndip) 1861 mark_inode_dirty(&odip->i_inode); 1862 1863 out_end_trans: 1864 gfs2_trans_end(sdp); 1865 out_gunlock: 1866 while (x--) { 1867 if (gfs2_holder_queued(ghs + x)) 1868 gfs2_glock_dq(ghs + x); 1869 gfs2_holder_uninit(ghs + x); 1870 } 1871 out_gunlock_r: 1872 if (gfs2_holder_initialized(&r_gh)) 1873 gfs2_glock_dq_uninit(&r_gh); 1874 out: 1875 return error; 1876 } 1877 1878 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir, 1879 struct dentry *odentry, struct inode *ndir, 1880 struct dentry *ndentry, unsigned int flags) 1881 { 1882 flags &= ~RENAME_NOREPLACE; 1883 1884 if (flags & ~RENAME_EXCHANGE) 1885 return -EINVAL; 1886 1887 if (flags & RENAME_EXCHANGE) 1888 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1889 1890 return gfs2_rename(odir, odentry, ndir, ndentry); 1891 } 1892 1893 /** 1894 * gfs2_get_link - Follow a symbolic link 1895 * @dentry: The dentry of the link 1896 * @inode: The inode of the link 1897 * @done: destructor for return value 1898 * 1899 * This can handle symlinks of any size. 1900 * 1901 * Returns: 0 on success or error code 1902 */ 1903 1904 static const char *gfs2_get_link(struct dentry *dentry, 1905 struct inode *inode, 1906 struct delayed_call *done) 1907 { 1908 struct gfs2_inode *ip = GFS2_I(inode); 1909 struct gfs2_holder i_gh; 1910 struct buffer_head *dibh; 1911 unsigned int size; 1912 char *buf; 1913 int error; 1914 1915 if (!dentry) 1916 return ERR_PTR(-ECHILD); 1917 1918 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1919 error = gfs2_glock_nq(&i_gh); 1920 if (error) { 1921 gfs2_holder_uninit(&i_gh); 1922 return ERR_PTR(error); 1923 } 1924 1925 size = (unsigned int)i_size_read(&ip->i_inode); 1926 if (size == 0) { 1927 gfs2_consist_inode(ip); 1928 buf = ERR_PTR(-EIO); 1929 goto out; 1930 } 1931 1932 error = gfs2_meta_inode_buffer(ip, &dibh); 1933 if (error) { 1934 buf = ERR_PTR(error); 1935 goto out; 1936 } 1937 1938 buf = kzalloc(size + 1, GFP_NOFS); 1939 if (!buf) 1940 buf = ERR_PTR(-ENOMEM); 1941 else 1942 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1943 brelse(dibh); 1944 out: 1945 gfs2_glock_dq_uninit(&i_gh); 1946 if (!IS_ERR(buf)) 1947 set_delayed_call(done, kfree_link, buf); 1948 return buf; 1949 } 1950 1951 /** 1952 * gfs2_permission 1953 * @idmap: idmap of the mount the inode was found from 1954 * @inode: The inode 1955 * @mask: The mask to be tested 1956 * 1957 * This may be called from the VFS directly, or from within GFS2 with the 1958 * inode locked, so we look to see if the glock is already locked and only 1959 * lock the glock if its not already been done. 1960 * 1961 * Returns: errno 1962 */ 1963 1964 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode, 1965 int mask) 1966 { 1967 int may_not_block = mask & MAY_NOT_BLOCK; 1968 struct gfs2_inode *ip; 1969 struct gfs2_holder i_gh; 1970 struct gfs2_glock *gl; 1971 int error; 1972 1973 gfs2_holder_mark_uninitialized(&i_gh); 1974 ip = GFS2_I(inode); 1975 gl = rcu_dereference_check(ip->i_gl, !may_not_block); 1976 if (unlikely(!gl)) { 1977 /* inode is getting torn down, must be RCU mode */ 1978 WARN_ON_ONCE(!may_not_block); 1979 return -ECHILD; 1980 } 1981 if (gfs2_glock_is_locked_by_me(gl) == NULL) { 1982 if (may_not_block) 1983 return -ECHILD; 1984 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1985 if (error) 1986 return error; 1987 } 1988 1989 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1990 error = -EPERM; 1991 else 1992 error = generic_permission(&nop_mnt_idmap, inode, mask); 1993 if (gfs2_holder_initialized(&i_gh)) 1994 gfs2_glock_dq_uninit(&i_gh); 1995 1996 return error; 1997 } 1998 1999 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 2000 { 2001 setattr_copy(&nop_mnt_idmap, inode, attr); 2002 mark_inode_dirty(inode); 2003 return 0; 2004 } 2005 2006 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 2007 { 2008 int error; 2009 2010 if (current->journal_info) 2011 return __gfs2_setattr_simple(inode, attr); 2012 2013 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 2014 if (error) 2015 return error; 2016 2017 error = __gfs2_setattr_simple(inode, attr); 2018 gfs2_trans_end(GFS2_SB(inode)); 2019 return error; 2020 } 2021 2022 static int setattr_chown(struct inode *inode, struct iattr *attr) 2023 { 2024 struct gfs2_inode *ip = GFS2_I(inode); 2025 struct gfs2_sbd *sdp = GFS2_SB(inode); 2026 kuid_t ouid, nuid; 2027 kgid_t ogid, ngid; 2028 int error; 2029 struct gfs2_alloc_parms ap = {}; 2030 2031 ouid = inode->i_uid; 2032 ogid = inode->i_gid; 2033 nuid = attr->ia_uid; 2034 ngid = attr->ia_gid; 2035 2036 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 2037 ouid = nuid = NO_UID_QUOTA_CHANGE; 2038 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 2039 ogid = ngid = NO_GID_QUOTA_CHANGE; 2040 error = gfs2_qa_get(ip); 2041 if (error) 2042 return error; 2043 2044 error = gfs2_rindex_update(sdp); 2045 if (error) 2046 goto out; 2047 2048 error = gfs2_quota_lock(ip, nuid, ngid); 2049 if (error) 2050 goto out; 2051 2052 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 2053 2054 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 2055 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 2056 error = gfs2_quota_check(ip, nuid, ngid, &ap); 2057 if (error) 2058 goto out_gunlock_q; 2059 } 2060 2061 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 2062 if (error) 2063 goto out_gunlock_q; 2064 2065 error = gfs2_setattr_simple(inode, attr); 2066 if (error) 2067 goto out_end_trans; 2068 2069 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 2070 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 2071 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 2072 gfs2_quota_change(ip, ap.target, nuid, ngid); 2073 } 2074 2075 out_end_trans: 2076 gfs2_trans_end(sdp); 2077 out_gunlock_q: 2078 gfs2_quota_unlock(ip); 2079 out: 2080 gfs2_qa_put(ip); 2081 return error; 2082 } 2083 2084 /** 2085 * gfs2_setattr - Change attributes on an inode 2086 * @idmap: idmap of the mount the inode was found from 2087 * @dentry: The dentry which is changing 2088 * @attr: The structure describing the change 2089 * 2090 * The VFS layer wants to change one or more of an inodes attributes. Write 2091 * that change out to disk. 2092 * 2093 * Returns: errno 2094 */ 2095 2096 static int gfs2_setattr(struct mnt_idmap *idmap, 2097 struct dentry *dentry, struct iattr *attr) 2098 { 2099 struct inode *inode = d_inode(dentry); 2100 struct gfs2_inode *ip = GFS2_I(inode); 2101 struct gfs2_holder i_gh; 2102 int error; 2103 2104 error = gfs2_qa_get(ip); 2105 if (error) 2106 return error; 2107 2108 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 2109 if (error) 2110 goto out; 2111 2112 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid); 2113 if (error) 2114 goto error; 2115 2116 error = setattr_prepare(&nop_mnt_idmap, dentry, attr); 2117 if (error) 2118 goto error; 2119 2120 if (attr->ia_valid & ATTR_SIZE) 2121 error = gfs2_setattr_size(inode, attr->ia_size); 2122 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2123 error = setattr_chown(inode, attr); 2124 else { 2125 error = gfs2_setattr_simple(inode, attr); 2126 if (!error && attr->ia_valid & ATTR_MODE) 2127 error = posix_acl_chmod(&nop_mnt_idmap, dentry, 2128 inode->i_mode); 2129 } 2130 2131 error: 2132 if (!error) 2133 mark_inode_dirty(inode); 2134 gfs2_glock_dq_uninit(&i_gh); 2135 out: 2136 gfs2_qa_put(ip); 2137 return error; 2138 } 2139 2140 /** 2141 * gfs2_getattr - Read out an inode's attributes 2142 * @idmap: idmap of the mount the inode was found from 2143 * @path: Object to query 2144 * @stat: The inode's stats 2145 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2146 * @flags: AT_STATX_xxx setting 2147 * 2148 * This may be called from the VFS directly, or from within GFS2 with the 2149 * inode locked, so we look to see if the glock is already locked and only 2150 * lock the glock if its not already been done. Note that its the NFS 2151 * readdirplus operation which causes this to be called (from filldir) 2152 * with the glock already held. 2153 * 2154 * Returns: errno 2155 */ 2156 2157 static int gfs2_getattr(struct mnt_idmap *idmap, 2158 const struct path *path, struct kstat *stat, 2159 u32 request_mask, unsigned int flags) 2160 { 2161 struct inode *inode = d_inode(path->dentry); 2162 struct gfs2_inode *ip = GFS2_I(inode); 2163 struct gfs2_holder gh; 2164 u32 gfsflags; 2165 int error; 2166 2167 gfs2_holder_mark_uninitialized(&gh); 2168 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2169 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2170 if (error) 2171 return error; 2172 } 2173 2174 gfsflags = ip->i_diskflags; 2175 if (gfsflags & GFS2_DIF_APPENDONLY) 2176 stat->attributes |= STATX_ATTR_APPEND; 2177 if (gfsflags & GFS2_DIF_IMMUTABLE) 2178 stat->attributes |= STATX_ATTR_IMMUTABLE; 2179 2180 stat->attributes_mask |= (STATX_ATTR_APPEND | 2181 STATX_ATTR_COMPRESSED | 2182 STATX_ATTR_ENCRYPTED | 2183 STATX_ATTR_IMMUTABLE | 2184 STATX_ATTR_NODUMP); 2185 2186 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 2187 2188 if (gfs2_holder_initialized(&gh)) 2189 gfs2_glock_dq_uninit(&gh); 2190 2191 return 0; 2192 } 2193 2194 static bool fault_in_fiemap(struct fiemap_extent_info *fi) 2195 { 2196 struct fiemap_extent __user *dest = fi->fi_extents_start; 2197 size_t size = sizeof(*dest) * fi->fi_extents_max; 2198 2199 return fault_in_safe_writeable((char __user *)dest, size) == 0; 2200 } 2201 2202 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2203 u64 start, u64 len) 2204 { 2205 struct gfs2_inode *ip = GFS2_I(inode); 2206 struct gfs2_holder gh; 2207 int ret; 2208 2209 inode_lock_shared(inode); 2210 2211 retry: 2212 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2213 if (ret) 2214 goto out; 2215 2216 pagefault_disable(); 2217 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2218 pagefault_enable(); 2219 2220 gfs2_glock_dq_uninit(&gh); 2221 2222 if (ret == -EFAULT && fault_in_fiemap(fieinfo)) { 2223 fieinfo->fi_extents_mapped = 0; 2224 goto retry; 2225 } 2226 2227 out: 2228 inode_unlock_shared(inode); 2229 return ret; 2230 } 2231 2232 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2233 { 2234 struct inode *inode = file->f_mapping->host; 2235 struct gfs2_inode *ip = GFS2_I(inode); 2236 struct gfs2_holder gh; 2237 loff_t ret; 2238 2239 inode_lock_shared(inode); 2240 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2241 if (!ret) 2242 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2243 gfs2_glock_dq_uninit(&gh); 2244 inode_unlock_shared(inode); 2245 2246 if (ret < 0) 2247 return ret; 2248 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2249 } 2250 2251 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2252 { 2253 struct inode *inode = file->f_mapping->host; 2254 struct gfs2_inode *ip = GFS2_I(inode); 2255 struct gfs2_holder gh; 2256 loff_t ret; 2257 2258 inode_lock_shared(inode); 2259 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2260 if (!ret) 2261 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2262 gfs2_glock_dq_uninit(&gh); 2263 inode_unlock_shared(inode); 2264 2265 if (ret < 0) 2266 return ret; 2267 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2268 } 2269 2270 static int gfs2_update_time(struct inode *inode, enum fs_update_time type, 2271 unsigned int flags) 2272 { 2273 struct gfs2_inode *ip = GFS2_I(inode); 2274 struct gfs2_glock *gl = ip->i_gl; 2275 struct gfs2_holder *gh; 2276 int error; 2277 2278 if (flags & IOCB_NOWAIT) 2279 return -EAGAIN; 2280 2281 gh = gfs2_glock_is_locked_by_me(gl); 2282 if (gh && gl->gl_state != LM_ST_EXCLUSIVE) { 2283 gfs2_glock_dq(gh); 2284 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2285 error = gfs2_glock_nq(gh); 2286 if (error) 2287 return error; 2288 } 2289 return generic_update_time(inode, type, flags); 2290 } 2291 2292 static const struct inode_operations gfs2_file_iops = { 2293 .permission = gfs2_permission, 2294 .setattr = gfs2_setattr, 2295 .getattr = gfs2_getattr, 2296 .listxattr = gfs2_listxattr, 2297 .fiemap = gfs2_fiemap, 2298 .get_inode_acl = gfs2_get_acl, 2299 .set_acl = gfs2_set_acl, 2300 .update_time = gfs2_update_time, 2301 .fileattr_get = gfs2_fileattr_get, 2302 .fileattr_set = gfs2_fileattr_set, 2303 }; 2304 2305 static const struct inode_operations gfs2_dir_iops = { 2306 .create = gfs2_create, 2307 .lookup = gfs2_lookup, 2308 .link = gfs2_link, 2309 .unlink = gfs2_unlink, 2310 .symlink = gfs2_symlink, 2311 .mkdir = gfs2_mkdir, 2312 .rmdir = gfs2_unlink, 2313 .mknod = gfs2_mknod, 2314 .rename = gfs2_rename2, 2315 .permission = gfs2_permission, 2316 .setattr = gfs2_setattr, 2317 .getattr = gfs2_getattr, 2318 .listxattr = gfs2_listxattr, 2319 .fiemap = gfs2_fiemap, 2320 .get_inode_acl = gfs2_get_acl, 2321 .set_acl = gfs2_set_acl, 2322 .update_time = gfs2_update_time, 2323 .atomic_open = gfs2_atomic_open, 2324 .fileattr_get = gfs2_fileattr_get, 2325 .fileattr_set = gfs2_fileattr_set, 2326 }; 2327 2328 static const struct inode_operations gfs2_symlink_iops = { 2329 .get_link = gfs2_get_link, 2330 .permission = gfs2_permission, 2331 .setattr = gfs2_setattr, 2332 .getattr = gfs2_getattr, 2333 .listxattr = gfs2_listxattr, 2334 .fiemap = gfs2_fiemap, 2335 }; 2336 2337