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(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 unlock_new_inode(inode); 908 return error; 909 910 fail_gunlock4: 911 glock_clear_object(ip->i_gl, ip); 912 glock_clear_object(io_gl, ip); 913 fail_gunlock3: 914 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 915 fail_gunlock2: 916 gfs2_glock_put(io_gl); 917 fail_dealloc_inode: 918 dealloc_error = 0; 919 if (ip->i_eattr) 920 dealloc_error = gfs2_ea_dealloc(ip, xattr_initialized); 921 clear_nlink(inode); 922 mark_inode_dirty(inode); 923 if (!dealloc_error) 924 dealloc_error = gfs2_dinode_dealloc(ip); 925 if (dealloc_error) 926 fs_warn(sdp, "%s: %d\n", __func__, dealloc_error); 927 ip->i_no_addr = 0; 928 fail_free_inode: 929 if (ip->i_gl) { 930 gfs2_glock_put(ip->i_gl); 931 ip->i_gl = NULL; 932 } 933 gfs2_rs_deltree(&ip->i_res); 934 gfs2_qa_put(ip); 935 fail_free_acls: 936 posix_acl_release(default_acl); 937 posix_acl_release(acl); 938 fail_gunlock: 939 gfs2_dir_no_add(&da); 940 gfs2_glock_dq_uninit(&d_gh); 941 if (!IS_ERR_OR_NULL(inode)) { 942 if (inode_state_read_once(inode) & I_NEW) 943 iget_failed(inode); 944 else 945 iput(inode); 946 } 947 if (gfs2_holder_initialized(&gh)) 948 gfs2_glock_dq_uninit(&gh); 949 fail: 950 gfs2_qa_put(dip); 951 return error; 952 } 953 954 /** 955 * gfs2_create - Create a file 956 * @idmap: idmap of the mount the inode was found from 957 * @dir: The directory in which to create the file 958 * @dentry: The dentry of the new file 959 * @mode: The mode of the new file 960 * @excl: Force fail if inode exists 961 * 962 * Returns: errno 963 */ 964 965 static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir, 966 struct dentry *dentry, umode_t mode, bool excl) 967 { 968 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 969 } 970 971 /** 972 * __gfs2_lookup - Look up a filename in a directory and return its inode 973 * @dir: The directory inode 974 * @dentry: The dentry of the new inode 975 * @file: File to be opened 976 * 977 * 978 * Returns: errno 979 */ 980 981 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 982 struct file *file) 983 { 984 struct inode *inode; 985 struct dentry *d; 986 struct gfs2_holder gh; 987 struct gfs2_glock *gl; 988 int error; 989 990 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 991 if (inode == NULL) { 992 d_add(dentry, NULL); 993 return NULL; 994 } 995 if (IS_ERR(inode)) 996 return ERR_CAST(inode); 997 998 gl = GFS2_I(inode)->i_gl; 999 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1000 if (error) { 1001 iput(inode); 1002 return ERR_PTR(error); 1003 } 1004 1005 d = d_splice_alias(inode, dentry); 1006 if (IS_ERR(d)) { 1007 gfs2_glock_dq_uninit(&gh); 1008 return d; 1009 } 1010 if (file && S_ISREG(inode->i_mode)) 1011 error = finish_open(file, dentry, gfs2_open_common); 1012 1013 gfs2_glock_dq_uninit(&gh); 1014 if (error) { 1015 dput(d); 1016 return ERR_PTR(error); 1017 } 1018 return d; 1019 } 1020 1021 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 1022 unsigned flags) 1023 { 1024 return __gfs2_lookup(dir, dentry, NULL); 1025 } 1026 1027 /** 1028 * gfs2_link - Link to a file 1029 * @old_dentry: The inode to link 1030 * @dir: Add link to this directory 1031 * @dentry: The name of the link 1032 * 1033 * Link the inode in "old_dentry" into the directory "dir" with the 1034 * name in "dentry". 1035 * 1036 * Returns: errno 1037 */ 1038 1039 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 1040 struct dentry *dentry) 1041 { 1042 struct gfs2_inode *dip = GFS2_I(dir); 1043 struct gfs2_sbd *sdp = GFS2_SB(dir); 1044 struct inode *inode = d_inode(old_dentry); 1045 struct gfs2_inode *ip = GFS2_I(inode); 1046 struct gfs2_holder d_gh, gh; 1047 struct buffer_head *dibh; 1048 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 1049 int error; 1050 1051 if (S_ISDIR(inode->i_mode)) 1052 return -EPERM; 1053 1054 error = gfs2_qa_get(dip); 1055 if (error) 1056 return error; 1057 1058 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1059 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1060 1061 error = gfs2_glock_nq(&d_gh); 1062 if (error) 1063 goto out_parent; 1064 1065 error = gfs2_glock_nq(&gh); 1066 if (error) 1067 goto out_child; 1068 1069 error = -ENOENT; 1070 if (inode->i_nlink == 0) 1071 goto out_gunlock; 1072 1073 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC); 1074 if (error) 1075 goto out_gunlock; 1076 1077 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 1078 switch (error) { 1079 case -ENOENT: 1080 break; 1081 case 0: 1082 error = -EEXIST; 1083 goto out_gunlock; 1084 default: 1085 goto out_gunlock; 1086 } 1087 1088 error = -EINVAL; 1089 if (!dip->i_inode.i_nlink) 1090 goto out_gunlock; 1091 error = -EFBIG; 1092 if (dip->i_entries == (u32)-1) 1093 goto out_gunlock; 1094 error = -EPERM; 1095 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1096 goto out_gunlock; 1097 error = -EMLINK; 1098 if (ip->i_inode.i_nlink == (u32)-1) 1099 goto out_gunlock; 1100 1101 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 1102 if (error < 0) 1103 goto out_gunlock; 1104 1105 if (da.nr_blocks) { 1106 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1107 error = gfs2_quota_lock_check(dip, &ap); 1108 if (error) 1109 goto out_gunlock; 1110 1111 error = gfs2_inplace_reserve(dip, &ap); 1112 if (error) 1113 goto out_gunlock_q; 1114 1115 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1116 if (error) 1117 goto out_ipres; 1118 } else { 1119 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1120 if (error) 1121 goto out_ipres; 1122 } 1123 1124 error = gfs2_meta_inode_buffer(ip, &dibh); 1125 if (error) 1126 goto out_end_trans; 1127 1128 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1129 if (error) 1130 goto out_brelse; 1131 1132 gfs2_trans_add_meta(ip->i_gl, dibh); 1133 inc_nlink(&ip->i_inode); 1134 inode_set_ctime_current(&ip->i_inode); 1135 ihold(inode); 1136 d_instantiate(dentry, inode); 1137 mark_inode_dirty(inode); 1138 1139 out_brelse: 1140 brelse(dibh); 1141 out_end_trans: 1142 gfs2_trans_end(sdp); 1143 out_ipres: 1144 if (da.nr_blocks) 1145 gfs2_inplace_release(dip); 1146 out_gunlock_q: 1147 if (da.nr_blocks) 1148 gfs2_quota_unlock(dip); 1149 out_gunlock: 1150 gfs2_dir_no_add(&da); 1151 gfs2_glock_dq(&gh); 1152 out_child: 1153 gfs2_glock_dq(&d_gh); 1154 out_parent: 1155 gfs2_qa_put(dip); 1156 gfs2_holder_uninit(&d_gh); 1157 gfs2_holder_uninit(&gh); 1158 return error; 1159 } 1160 1161 /* 1162 * gfs2_unlink_ok - check to see that a inode is still in a directory 1163 * @dip: the directory 1164 * @name: the name of the file 1165 * @ip: the inode 1166 * 1167 * Assumes that the lock on (at least) @dip is held. 1168 * 1169 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1170 */ 1171 1172 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1173 const struct gfs2_inode *ip) 1174 { 1175 int error; 1176 1177 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1178 return -EPERM; 1179 1180 if ((dip->i_inode.i_mode & S_ISVTX) && 1181 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1182 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1183 return -EPERM; 1184 1185 if (IS_APPEND(&dip->i_inode)) 1186 return -EPERM; 1187 1188 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 1189 MAY_WRITE | MAY_EXEC); 1190 if (error) 1191 return error; 1192 1193 return gfs2_dir_check(&dip->i_inode, name, ip); 1194 } 1195 1196 /** 1197 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1198 * @dip: The parent directory 1199 * @dentry: The dentry to unlink 1200 * 1201 * Called with all the locks and in a transaction. This will only be 1202 * called for a directory after it has been checked to ensure it is empty. 1203 * 1204 * Returns: 0 on success, or an error 1205 */ 1206 1207 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1208 const struct dentry *dentry) 1209 { 1210 struct inode *inode = d_inode(dentry); 1211 struct gfs2_inode *ip = GFS2_I(inode); 1212 int error; 1213 1214 error = gfs2_dir_del(dip, dentry); 1215 if (error) 1216 return error; 1217 1218 ip->i_entries = 0; 1219 inode_set_ctime_current(inode); 1220 if (S_ISDIR(inode->i_mode)) 1221 clear_nlink(inode); 1222 else 1223 drop_nlink(inode); 1224 mark_inode_dirty(inode); 1225 if (inode->i_nlink == 0) 1226 gfs2_unlink_di(inode); 1227 return 0; 1228 } 1229 1230 1231 /** 1232 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1233 * @dir: The inode of the directory containing the inode to unlink 1234 * @dentry: The file itself 1235 * 1236 * This routine uses the type of the inode as a flag to figure out 1237 * whether this is an unlink or an rmdir. 1238 * 1239 * Returns: errno 1240 */ 1241 1242 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1243 { 1244 struct gfs2_inode *dip = GFS2_I(dir); 1245 struct gfs2_sbd *sdp = GFS2_SB(dir); 1246 struct inode *inode = d_inode(dentry); 1247 struct gfs2_inode *ip = GFS2_I(inode); 1248 struct gfs2_holder d_gh, r_gh, gh; 1249 struct gfs2_rgrpd *rgd; 1250 int error; 1251 1252 error = gfs2_rindex_update(sdp); 1253 if (error) 1254 return error; 1255 1256 error = -EROFS; 1257 1258 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1259 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1260 1261 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1262 if (!rgd) 1263 goto out_inodes; 1264 1265 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh); 1266 1267 1268 error = gfs2_glock_nq(&d_gh); 1269 if (error) 1270 goto out_parent; 1271 1272 error = gfs2_glock_nq(&gh); 1273 if (error) 1274 goto out_child; 1275 1276 error = -ENOENT; 1277 if (inode->i_nlink == 0) 1278 goto out_rgrp; 1279 1280 if (S_ISDIR(inode->i_mode)) { 1281 error = -ENOTEMPTY; 1282 if (ip->i_entries > 2 || inode->i_nlink > 2) 1283 goto out_rgrp; 1284 } 1285 1286 error = gfs2_glock_nq(&r_gh); /* rgrp */ 1287 if (error) 1288 goto out_rgrp; 1289 1290 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1291 if (error) 1292 goto out_gunlock; 1293 1294 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1295 if (error) 1296 goto out_gunlock; 1297 1298 error = gfs2_unlink_inode(dip, dentry); 1299 gfs2_trans_end(sdp); 1300 1301 out_gunlock: 1302 gfs2_glock_dq(&r_gh); 1303 out_rgrp: 1304 gfs2_glock_dq(&gh); 1305 out_child: 1306 gfs2_glock_dq(&d_gh); 1307 out_parent: 1308 gfs2_holder_uninit(&r_gh); 1309 out_inodes: 1310 gfs2_holder_uninit(&gh); 1311 gfs2_holder_uninit(&d_gh); 1312 return error; 1313 } 1314 1315 /** 1316 * gfs2_symlink - Create a symlink 1317 * @idmap: idmap of the mount the inode was found from 1318 * @dir: The directory to create the symlink in 1319 * @dentry: The dentry to put the symlink in 1320 * @symname: The thing which the link points to 1321 * 1322 * Returns: errno 1323 */ 1324 1325 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir, 1326 struct dentry *dentry, const char *symname) 1327 { 1328 unsigned int size; 1329 1330 size = strlen(symname); 1331 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1332 return -ENAMETOOLONG; 1333 1334 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1335 } 1336 1337 /** 1338 * gfs2_mkdir - Make a directory 1339 * @idmap: idmap of the mount the inode was found from 1340 * @dir: The parent directory of the new one 1341 * @dentry: The dentry of the new directory 1342 * @mode: The mode of the new directory 1343 * 1344 * Returns: the dentry, or ERR_PTR(errno) 1345 */ 1346 1347 static struct dentry *gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1348 struct dentry *dentry, umode_t mode) 1349 { 1350 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1351 1352 return ERR_PTR(gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0)); 1353 } 1354 1355 /** 1356 * gfs2_mknod - Make a special file 1357 * @idmap: idmap of the mount the inode was found from 1358 * @dir: The directory in which the special file will reside 1359 * @dentry: The dentry of the special file 1360 * @mode: The mode of the special file 1361 * @dev: The device specification of the special file 1362 * 1363 */ 1364 1365 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir, 1366 struct dentry *dentry, umode_t mode, dev_t dev) 1367 { 1368 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1369 } 1370 1371 /** 1372 * gfs2_atomic_open - Atomically open a file 1373 * @dir: The directory 1374 * @dentry: The proposed new entry 1375 * @file: The proposed new struct file 1376 * @flags: open flags 1377 * @mode: File mode 1378 * 1379 * Returns: error code or 0 for success 1380 */ 1381 1382 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1383 struct file *file, unsigned flags, 1384 umode_t mode) 1385 { 1386 bool excl = !!(flags & O_EXCL); 1387 1388 if (d_in_lookup(dentry)) { 1389 struct dentry *d = __gfs2_lookup(dir, dentry, file); 1390 if (file->f_mode & FMODE_OPENED) { 1391 if (IS_ERR(d)) 1392 return PTR_ERR(d); 1393 dput(d); 1394 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1395 } 1396 if (d || d_really_is_positive(dentry)) 1397 return finish_no_open(file, d); 1398 } 1399 if (!(flags & O_CREAT)) 1400 return -ENOENT; 1401 1402 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1403 } 1404 1405 /* 1406 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1407 * @this: move this 1408 * @to: to here 1409 * 1410 * Follow @to back to the root and make sure we don't encounter @this 1411 * Assumes we already hold the rename lock. 1412 * 1413 * Returns: errno 1414 */ 1415 1416 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1417 { 1418 struct inode *dir = &to->i_inode; 1419 struct super_block *sb = dir->i_sb; 1420 struct inode *tmp; 1421 int error = 0; 1422 1423 igrab(dir); 1424 1425 for (;;) { 1426 if (dir == &this->i_inode) { 1427 error = -EINVAL; 1428 break; 1429 } 1430 if (dir == d_inode(sb->s_root)) { 1431 error = 0; 1432 break; 1433 } 1434 1435 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1436 if (!tmp) { 1437 error = -ENOENT; 1438 break; 1439 } 1440 if (IS_ERR(tmp)) { 1441 error = PTR_ERR(tmp); 1442 break; 1443 } 1444 1445 iput(dir); 1446 dir = tmp; 1447 } 1448 1449 iput(dir); 1450 1451 return error; 1452 } 1453 1454 /** 1455 * update_moved_ino - Update an inode that's being moved 1456 * @ip: The inode being moved 1457 * @ndip: The parent directory of the new filename 1458 * @dir_rename: True of ip is a directory 1459 * 1460 * Returns: errno 1461 */ 1462 1463 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1464 int dir_rename) 1465 { 1466 if (dir_rename) 1467 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1468 1469 inode_set_ctime_current(&ip->i_inode); 1470 mark_inode_dirty_sync(&ip->i_inode); 1471 return 0; 1472 } 1473 1474 1475 /** 1476 * gfs2_rename - Rename a file 1477 * @odir: Parent directory of old file name 1478 * @odentry: The old dentry of the file 1479 * @ndir: Parent directory of new file name 1480 * @ndentry: The new dentry of the file 1481 * 1482 * Returns: errno 1483 */ 1484 1485 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1486 struct inode *ndir, struct dentry *ndentry) 1487 { 1488 struct gfs2_inode *odip = GFS2_I(odir); 1489 struct gfs2_inode *ndip = GFS2_I(ndir); 1490 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1491 struct gfs2_inode *nip = NULL; 1492 struct gfs2_sbd *sdp = GFS2_SB(odir); 1493 struct gfs2_holder ghs[4], r_gh, rd_gh; 1494 struct gfs2_rgrpd *nrgd; 1495 unsigned int num_gh; 1496 int dir_rename = 0; 1497 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1498 unsigned int retries = 0, x; 1499 int error; 1500 1501 gfs2_holder_mark_uninitialized(&r_gh); 1502 gfs2_holder_mark_uninitialized(&rd_gh); 1503 if (d_really_is_positive(ndentry)) { 1504 nip = GFS2_I(d_inode(ndentry)); 1505 if (ip == nip) 1506 return 0; 1507 } 1508 1509 error = gfs2_rindex_update(sdp); 1510 if (error) 1511 return error; 1512 1513 error = gfs2_qa_get(ndip); 1514 if (error) 1515 return error; 1516 1517 if (odip != ndip) { 1518 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1519 0, &r_gh); 1520 if (error) 1521 goto out; 1522 1523 if (S_ISDIR(ip->i_inode.i_mode)) { 1524 dir_rename = 1; 1525 /* don't move a directory into its subdir */ 1526 error = gfs2_ok_to_move(ip, ndip); 1527 if (error) 1528 goto out_gunlock_r; 1529 } 1530 } 1531 1532 num_gh = 1; 1533 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1534 if (odip != ndip) { 1535 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1536 ghs + num_gh); 1537 num_gh++; 1538 } 1539 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1540 num_gh++; 1541 1542 if (nip) { 1543 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1544 ghs + num_gh); 1545 num_gh++; 1546 } 1547 1548 again: 1549 for (x = 0; x < num_gh; x++) { 1550 error = gfs2_glock_nq(ghs + x); 1551 if (error) 1552 goto out_gunlock; 1553 } 1554 error = gfs2_glock_async_wait(num_gh, ghs, retries); 1555 if (error == -ESTALE) { 1556 retries++; 1557 goto again; 1558 } 1559 if (error) 1560 goto out_gunlock; 1561 1562 if (nip) { 1563 /* Grab the resource group glock for unlink flag twiddling. 1564 * This is the case where the target dinode already exists 1565 * so we unlink before doing the rename. 1566 */ 1567 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1568 if (!nrgd) { 1569 error = -ENOENT; 1570 goto out_gunlock; 1571 } 1572 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1573 LM_FLAG_NODE_SCOPE, &rd_gh); 1574 if (error) 1575 goto out_gunlock; 1576 } 1577 1578 error = -ENOENT; 1579 if (ip->i_inode.i_nlink == 0) 1580 goto out_gunlock; 1581 1582 /* Check out the old directory */ 1583 1584 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1585 if (error) 1586 goto out_gunlock; 1587 1588 /* Check out the new directory */ 1589 1590 if (nip) { 1591 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1592 if (error) 1593 goto out_gunlock; 1594 1595 if (nip->i_inode.i_nlink == 0) { 1596 error = -EAGAIN; 1597 goto out_gunlock; 1598 } 1599 1600 if (S_ISDIR(nip->i_inode.i_mode)) { 1601 if (nip->i_entries < 2) { 1602 gfs2_consist_inode(nip); 1603 error = -EIO; 1604 goto out_gunlock; 1605 } 1606 if (nip->i_entries > 2) { 1607 error = -ENOTEMPTY; 1608 goto out_gunlock; 1609 } 1610 } 1611 } else { 1612 error = gfs2_permission(&nop_mnt_idmap, ndir, 1613 MAY_WRITE | MAY_EXEC); 1614 if (error) 1615 goto out_gunlock; 1616 1617 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1618 switch (error) { 1619 case -ENOENT: 1620 error = 0; 1621 break; 1622 case 0: 1623 error = -EEXIST; 1624 goto out_gunlock; 1625 default: 1626 goto out_gunlock; 1627 } 1628 1629 if (odip != ndip) { 1630 if (!ndip->i_inode.i_nlink) { 1631 error = -ENOENT; 1632 goto out_gunlock; 1633 } 1634 if (ndip->i_entries == (u32)-1) { 1635 error = -EFBIG; 1636 goto out_gunlock; 1637 } 1638 if (S_ISDIR(ip->i_inode.i_mode) && 1639 ndip->i_inode.i_nlink == (u32)-1) { 1640 error = -EMLINK; 1641 goto out_gunlock; 1642 } 1643 } 1644 } 1645 1646 /* Check out the dir to be renamed */ 1647 1648 if (dir_rename) { 1649 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry), 1650 MAY_WRITE); 1651 if (error) 1652 goto out_gunlock; 1653 } 1654 1655 if (nip == NULL) { 1656 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1657 if (error) 1658 goto out_gunlock; 1659 } 1660 1661 if (da.nr_blocks) { 1662 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1663 error = gfs2_quota_lock_check(ndip, &ap); 1664 if (error) 1665 goto out_gunlock; 1666 1667 error = gfs2_inplace_reserve(ndip, &ap); 1668 if (error) 1669 goto out_gunlock_q; 1670 1671 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1672 4 * RES_LEAF + 4, 0); 1673 if (error) 1674 goto out_ipreserv; 1675 } else { 1676 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1677 5 * RES_LEAF + 4, 0); 1678 if (error) 1679 goto out_gunlock; 1680 } 1681 1682 /* Remove the target file, if it exists */ 1683 1684 if (nip) 1685 error = gfs2_unlink_inode(ndip, ndentry); 1686 1687 error = update_moved_ino(ip, ndip, dir_rename); 1688 if (error) 1689 goto out_end_trans; 1690 1691 error = gfs2_dir_del(odip, odentry); 1692 if (error) 1693 goto out_end_trans; 1694 1695 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1696 if (error) 1697 goto out_end_trans; 1698 1699 out_end_trans: 1700 gfs2_trans_end(sdp); 1701 out_ipreserv: 1702 if (da.nr_blocks) 1703 gfs2_inplace_release(ndip); 1704 out_gunlock_q: 1705 if (da.nr_blocks) 1706 gfs2_quota_unlock(ndip); 1707 out_gunlock: 1708 gfs2_dir_no_add(&da); 1709 if (gfs2_holder_initialized(&rd_gh)) 1710 gfs2_glock_dq_uninit(&rd_gh); 1711 1712 while (x--) { 1713 if (gfs2_holder_queued(ghs + x)) 1714 gfs2_glock_dq(ghs + x); 1715 gfs2_holder_uninit(ghs + x); 1716 } 1717 out_gunlock_r: 1718 if (gfs2_holder_initialized(&r_gh)) 1719 gfs2_glock_dq_uninit(&r_gh); 1720 out: 1721 gfs2_qa_put(ndip); 1722 return error; 1723 } 1724 1725 /** 1726 * gfs2_exchange - exchange two files 1727 * @odir: Parent directory of old file name 1728 * @odentry: The old dentry of the file 1729 * @ndir: Parent directory of new file name 1730 * @ndentry: The new dentry of the file 1731 * @flags: The rename flags 1732 * 1733 * Returns: errno 1734 */ 1735 1736 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1737 struct inode *ndir, struct dentry *ndentry, 1738 unsigned int flags) 1739 { 1740 struct gfs2_inode *odip = GFS2_I(odir); 1741 struct gfs2_inode *ndip = GFS2_I(ndir); 1742 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1743 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1744 struct gfs2_sbd *sdp = GFS2_SB(odir); 1745 struct gfs2_holder ghs[4], r_gh; 1746 unsigned int num_gh; 1747 unsigned int retries = 0, x; 1748 umode_t old_mode = oip->i_inode.i_mode; 1749 umode_t new_mode = nip->i_inode.i_mode; 1750 int error; 1751 1752 gfs2_holder_mark_uninitialized(&r_gh); 1753 error = gfs2_rindex_update(sdp); 1754 if (error) 1755 return error; 1756 1757 if (odip != ndip) { 1758 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1759 0, &r_gh); 1760 if (error) 1761 goto out; 1762 1763 if (S_ISDIR(old_mode)) { 1764 /* don't move a directory into its subdir */ 1765 error = gfs2_ok_to_move(oip, ndip); 1766 if (error) 1767 goto out_gunlock_r; 1768 } 1769 1770 if (S_ISDIR(new_mode)) { 1771 /* don't move a directory into its subdir */ 1772 error = gfs2_ok_to_move(nip, odip); 1773 if (error) 1774 goto out_gunlock_r; 1775 } 1776 } 1777 1778 num_gh = 1; 1779 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1780 if (odip != ndip) { 1781 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1782 ghs + num_gh); 1783 num_gh++; 1784 } 1785 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1786 num_gh++; 1787 1788 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1789 num_gh++; 1790 1791 again: 1792 for (x = 0; x < num_gh; x++) { 1793 error = gfs2_glock_nq(ghs + x); 1794 if (error) 1795 goto out_gunlock; 1796 } 1797 1798 error = gfs2_glock_async_wait(num_gh, ghs, retries); 1799 if (error == -ESTALE) { 1800 retries++; 1801 goto again; 1802 } 1803 if (error) 1804 goto out_gunlock; 1805 1806 error = -ENOENT; 1807 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1808 goto out_gunlock; 1809 1810 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1811 if (error) 1812 goto out_gunlock; 1813 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1814 if (error) 1815 goto out_gunlock; 1816 1817 if (S_ISDIR(old_mode)) { 1818 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode, 1819 MAY_WRITE); 1820 if (error) 1821 goto out_gunlock; 1822 } 1823 if (S_ISDIR(new_mode)) { 1824 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode, 1825 MAY_WRITE); 1826 if (error) 1827 goto out_gunlock; 1828 } 1829 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1830 if (error) 1831 goto out_gunlock; 1832 1833 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1834 if (error) 1835 goto out_end_trans; 1836 1837 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1838 if (error) 1839 goto out_end_trans; 1840 1841 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1842 IF2DT(old_mode)); 1843 if (error) 1844 goto out_end_trans; 1845 1846 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1847 IF2DT(new_mode)); 1848 if (error) 1849 goto out_end_trans; 1850 1851 if (odip != ndip) { 1852 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1853 inc_nlink(&odip->i_inode); 1854 drop_nlink(&ndip->i_inode); 1855 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1856 inc_nlink(&ndip->i_inode); 1857 drop_nlink(&odip->i_inode); 1858 } 1859 } 1860 mark_inode_dirty(&ndip->i_inode); 1861 if (odip != ndip) 1862 mark_inode_dirty(&odip->i_inode); 1863 1864 out_end_trans: 1865 gfs2_trans_end(sdp); 1866 out_gunlock: 1867 while (x--) { 1868 if (gfs2_holder_queued(ghs + x)) 1869 gfs2_glock_dq(ghs + x); 1870 gfs2_holder_uninit(ghs + x); 1871 } 1872 out_gunlock_r: 1873 if (gfs2_holder_initialized(&r_gh)) 1874 gfs2_glock_dq_uninit(&r_gh); 1875 out: 1876 return error; 1877 } 1878 1879 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir, 1880 struct dentry *odentry, struct inode *ndir, 1881 struct dentry *ndentry, unsigned int flags) 1882 { 1883 flags &= ~RENAME_NOREPLACE; 1884 1885 if (flags & ~RENAME_EXCHANGE) 1886 return -EINVAL; 1887 1888 if (flags & RENAME_EXCHANGE) 1889 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1890 1891 return gfs2_rename(odir, odentry, ndir, ndentry); 1892 } 1893 1894 /** 1895 * gfs2_get_link - Follow a symbolic link 1896 * @dentry: The dentry of the link 1897 * @inode: The inode of the link 1898 * @done: destructor for return value 1899 * 1900 * This can handle symlinks of any size. 1901 * 1902 * Returns: 0 on success or error code 1903 */ 1904 1905 static const char *gfs2_get_link(struct dentry *dentry, 1906 struct inode *inode, 1907 struct delayed_call *done) 1908 { 1909 struct gfs2_inode *ip = GFS2_I(inode); 1910 struct gfs2_holder i_gh; 1911 struct buffer_head *dibh; 1912 unsigned int size; 1913 char *buf; 1914 int error; 1915 1916 if (!dentry) 1917 return ERR_PTR(-ECHILD); 1918 1919 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1920 error = gfs2_glock_nq(&i_gh); 1921 if (error) { 1922 gfs2_holder_uninit(&i_gh); 1923 return ERR_PTR(error); 1924 } 1925 1926 size = (unsigned int)i_size_read(&ip->i_inode); 1927 if (size == 0) { 1928 gfs2_consist_inode(ip); 1929 buf = ERR_PTR(-EIO); 1930 goto out; 1931 } 1932 1933 error = gfs2_meta_inode_buffer(ip, &dibh); 1934 if (error) { 1935 buf = ERR_PTR(error); 1936 goto out; 1937 } 1938 1939 buf = kzalloc(size + 1, GFP_NOFS); 1940 if (!buf) 1941 buf = ERR_PTR(-ENOMEM); 1942 else 1943 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1944 brelse(dibh); 1945 out: 1946 gfs2_glock_dq_uninit(&i_gh); 1947 if (!IS_ERR(buf)) 1948 set_delayed_call(done, kfree_link, buf); 1949 return buf; 1950 } 1951 1952 /** 1953 * gfs2_permission 1954 * @idmap: idmap of the mount the inode was found from 1955 * @inode: The inode 1956 * @mask: The mask to be tested 1957 * 1958 * This may be called from the VFS directly, or from within GFS2 with the 1959 * inode locked, so we look to see if the glock is already locked and only 1960 * lock the glock if its not already been done. 1961 * 1962 * Returns: errno 1963 */ 1964 1965 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode, 1966 int mask) 1967 { 1968 int may_not_block = mask & MAY_NOT_BLOCK; 1969 struct gfs2_inode *ip; 1970 struct gfs2_holder i_gh; 1971 struct gfs2_glock *gl; 1972 int error; 1973 1974 gfs2_holder_mark_uninitialized(&i_gh); 1975 ip = GFS2_I(inode); 1976 gl = rcu_dereference_check(ip->i_gl, !may_not_block); 1977 if (unlikely(!gl)) { 1978 /* inode is getting torn down, must be RCU mode */ 1979 WARN_ON_ONCE(!may_not_block); 1980 return -ECHILD; 1981 } 1982 if (gfs2_glock_is_locked_by_me(gl) == NULL) { 1983 if (may_not_block) 1984 return -ECHILD; 1985 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1986 if (error) 1987 return error; 1988 } 1989 1990 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1991 error = -EPERM; 1992 else 1993 error = generic_permission(&nop_mnt_idmap, inode, mask); 1994 if (gfs2_holder_initialized(&i_gh)) 1995 gfs2_glock_dq_uninit(&i_gh); 1996 1997 return error; 1998 } 1999 2000 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 2001 { 2002 setattr_copy(&nop_mnt_idmap, inode, attr); 2003 mark_inode_dirty(inode); 2004 return 0; 2005 } 2006 2007 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 2008 { 2009 int error; 2010 2011 if (current->journal_info) 2012 return __gfs2_setattr_simple(inode, attr); 2013 2014 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 2015 if (error) 2016 return error; 2017 2018 error = __gfs2_setattr_simple(inode, attr); 2019 gfs2_trans_end(GFS2_SB(inode)); 2020 return error; 2021 } 2022 2023 static int setattr_chown(struct inode *inode, struct iattr *attr) 2024 { 2025 struct gfs2_inode *ip = GFS2_I(inode); 2026 struct gfs2_sbd *sdp = GFS2_SB(inode); 2027 kuid_t ouid, nuid; 2028 kgid_t ogid, ngid; 2029 int error; 2030 struct gfs2_alloc_parms ap = {}; 2031 2032 ouid = inode->i_uid; 2033 ogid = inode->i_gid; 2034 nuid = attr->ia_uid; 2035 ngid = attr->ia_gid; 2036 2037 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 2038 ouid = nuid = NO_UID_QUOTA_CHANGE; 2039 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 2040 ogid = ngid = NO_GID_QUOTA_CHANGE; 2041 error = gfs2_qa_get(ip); 2042 if (error) 2043 return error; 2044 2045 error = gfs2_rindex_update(sdp); 2046 if (error) 2047 goto out; 2048 2049 error = gfs2_quota_lock(ip, nuid, ngid); 2050 if (error) 2051 goto out; 2052 2053 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 2054 2055 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 2056 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 2057 error = gfs2_quota_check(ip, nuid, ngid, &ap); 2058 if (error) 2059 goto out_gunlock_q; 2060 } 2061 2062 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 2063 if (error) 2064 goto out_gunlock_q; 2065 2066 error = gfs2_setattr_simple(inode, attr); 2067 if (error) 2068 goto out_end_trans; 2069 2070 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 2071 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 2072 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 2073 gfs2_quota_change(ip, ap.target, nuid, ngid); 2074 } 2075 2076 out_end_trans: 2077 gfs2_trans_end(sdp); 2078 out_gunlock_q: 2079 gfs2_quota_unlock(ip); 2080 out: 2081 gfs2_qa_put(ip); 2082 return error; 2083 } 2084 2085 /** 2086 * gfs2_setattr - Change attributes on an inode 2087 * @idmap: idmap of the mount the inode was found from 2088 * @dentry: The dentry which is changing 2089 * @attr: The structure describing the change 2090 * 2091 * The VFS layer wants to change one or more of an inodes attributes. Write 2092 * that change out to disk. 2093 * 2094 * Returns: errno 2095 */ 2096 2097 static int gfs2_setattr(struct mnt_idmap *idmap, 2098 struct dentry *dentry, struct iattr *attr) 2099 { 2100 struct inode *inode = d_inode(dentry); 2101 struct gfs2_inode *ip = GFS2_I(inode); 2102 struct gfs2_holder i_gh; 2103 int error; 2104 2105 error = gfs2_qa_get(ip); 2106 if (error) 2107 return error; 2108 2109 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 2110 if (error) 2111 goto out; 2112 2113 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid); 2114 if (error) 2115 goto error; 2116 2117 error = setattr_prepare(&nop_mnt_idmap, dentry, attr); 2118 if (error) 2119 goto error; 2120 2121 if (attr->ia_valid & ATTR_SIZE) 2122 error = gfs2_setattr_size(inode, attr->ia_size); 2123 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2124 error = setattr_chown(inode, attr); 2125 else { 2126 error = gfs2_setattr_simple(inode, attr); 2127 if (!error && attr->ia_valid & ATTR_MODE) 2128 error = posix_acl_chmod(&nop_mnt_idmap, dentry, 2129 inode->i_mode); 2130 } 2131 2132 error: 2133 if (!error) 2134 mark_inode_dirty(inode); 2135 gfs2_glock_dq_uninit(&i_gh); 2136 out: 2137 gfs2_qa_put(ip); 2138 return error; 2139 } 2140 2141 /** 2142 * gfs2_getattr - Read out an inode's attributes 2143 * @idmap: idmap of the mount the inode was found from 2144 * @path: Object to query 2145 * @stat: The inode's stats 2146 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2147 * @flags: AT_STATX_xxx setting 2148 * 2149 * This may be called from the VFS directly, or from within GFS2 with the 2150 * inode locked, so we look to see if the glock is already locked and only 2151 * lock the glock if its not already been done. Note that its the NFS 2152 * readdirplus operation which causes this to be called (from filldir) 2153 * with the glock already held. 2154 * 2155 * Returns: errno 2156 */ 2157 2158 static int gfs2_getattr(struct mnt_idmap *idmap, 2159 const struct path *path, struct kstat *stat, 2160 u32 request_mask, unsigned int flags) 2161 { 2162 struct inode *inode = d_inode(path->dentry); 2163 struct gfs2_inode *ip = GFS2_I(inode); 2164 struct gfs2_holder gh; 2165 u32 gfsflags; 2166 int error; 2167 2168 gfs2_holder_mark_uninitialized(&gh); 2169 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2170 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2171 if (error) 2172 return error; 2173 } 2174 2175 gfsflags = ip->i_diskflags; 2176 if (gfsflags & GFS2_DIF_APPENDONLY) 2177 stat->attributes |= STATX_ATTR_APPEND; 2178 if (gfsflags & GFS2_DIF_IMMUTABLE) 2179 stat->attributes |= STATX_ATTR_IMMUTABLE; 2180 2181 stat->attributes_mask |= (STATX_ATTR_APPEND | 2182 STATX_ATTR_COMPRESSED | 2183 STATX_ATTR_ENCRYPTED | 2184 STATX_ATTR_IMMUTABLE | 2185 STATX_ATTR_NODUMP); 2186 2187 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 2188 2189 if (gfs2_holder_initialized(&gh)) 2190 gfs2_glock_dq_uninit(&gh); 2191 2192 return 0; 2193 } 2194 2195 static bool fault_in_fiemap(struct fiemap_extent_info *fi) 2196 { 2197 struct fiemap_extent __user *dest = fi->fi_extents_start; 2198 size_t size = sizeof(*dest) * fi->fi_extents_max; 2199 2200 return fault_in_safe_writeable((char __user *)dest, size) == 0; 2201 } 2202 2203 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2204 u64 start, u64 len) 2205 { 2206 struct gfs2_inode *ip = GFS2_I(inode); 2207 struct gfs2_holder gh; 2208 int ret; 2209 2210 inode_lock_shared(inode); 2211 2212 retry: 2213 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2214 if (ret) 2215 goto out; 2216 2217 pagefault_disable(); 2218 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2219 pagefault_enable(); 2220 2221 gfs2_glock_dq_uninit(&gh); 2222 2223 if (ret == -EFAULT && fault_in_fiemap(fieinfo)) { 2224 fieinfo->fi_extents_mapped = 0; 2225 goto retry; 2226 } 2227 2228 out: 2229 inode_unlock_shared(inode); 2230 return ret; 2231 } 2232 2233 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2234 { 2235 struct inode *inode = file->f_mapping->host; 2236 struct gfs2_inode *ip = GFS2_I(inode); 2237 struct gfs2_holder gh; 2238 loff_t ret; 2239 2240 inode_lock_shared(inode); 2241 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2242 if (!ret) 2243 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2244 gfs2_glock_dq_uninit(&gh); 2245 inode_unlock_shared(inode); 2246 2247 if (ret < 0) 2248 return ret; 2249 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2250 } 2251 2252 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2253 { 2254 struct inode *inode = file->f_mapping->host; 2255 struct gfs2_inode *ip = GFS2_I(inode); 2256 struct gfs2_holder gh; 2257 loff_t ret; 2258 2259 inode_lock_shared(inode); 2260 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2261 if (!ret) 2262 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2263 gfs2_glock_dq_uninit(&gh); 2264 inode_unlock_shared(inode); 2265 2266 if (ret < 0) 2267 return ret; 2268 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2269 } 2270 2271 static int gfs2_update_time(struct inode *inode, enum fs_update_time type, 2272 unsigned int flags) 2273 { 2274 struct gfs2_inode *ip = GFS2_I(inode); 2275 struct gfs2_glock *gl = ip->i_gl; 2276 struct gfs2_holder *gh; 2277 int error; 2278 2279 if (flags & IOCB_NOWAIT) 2280 return -EAGAIN; 2281 2282 gh = gfs2_glock_is_locked_by_me(gl); 2283 if (gh && gl->gl_state != LM_ST_EXCLUSIVE) { 2284 gfs2_glock_dq(gh); 2285 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2286 error = gfs2_glock_nq(gh); 2287 if (error) 2288 return error; 2289 } 2290 return generic_update_time(inode, type, flags); 2291 } 2292 2293 static const struct inode_operations gfs2_file_iops = { 2294 .permission = gfs2_permission, 2295 .setattr = gfs2_setattr, 2296 .getattr = gfs2_getattr, 2297 .listxattr = gfs2_listxattr, 2298 .fiemap = gfs2_fiemap, 2299 .get_inode_acl = gfs2_get_acl, 2300 .set_acl = gfs2_set_acl, 2301 .update_time = gfs2_update_time, 2302 .fileattr_get = gfs2_fileattr_get, 2303 .fileattr_set = gfs2_fileattr_set, 2304 }; 2305 2306 static const struct inode_operations gfs2_dir_iops = { 2307 .create = gfs2_create, 2308 .lookup = gfs2_lookup, 2309 .link = gfs2_link, 2310 .unlink = gfs2_unlink, 2311 .symlink = gfs2_symlink, 2312 .mkdir = gfs2_mkdir, 2313 .rmdir = gfs2_unlink, 2314 .mknod = gfs2_mknod, 2315 .rename = gfs2_rename2, 2316 .permission = gfs2_permission, 2317 .setattr = gfs2_setattr, 2318 .getattr = gfs2_getattr, 2319 .listxattr = gfs2_listxattr, 2320 .fiemap = gfs2_fiemap, 2321 .get_inode_acl = gfs2_get_acl, 2322 .set_acl = gfs2_set_acl, 2323 .update_time = gfs2_update_time, 2324 .atomic_open = gfs2_atomic_open, 2325 .fileattr_get = gfs2_fileattr_get, 2326 .fileattr_set = gfs2_fileattr_set, 2327 }; 2328 2329 static const struct inode_operations gfs2_symlink_iops = { 2330 .get_link = gfs2_get_link, 2331 .permission = gfs2_permission, 2332 .setattr = gfs2_setattr, 2333 .getattr = gfs2_getattr, 2334 .listxattr = gfs2_listxattr, 2335 .fiemap = gfs2_fiemap, 2336 }; 2337 2338