1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/sched.h> 10 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/blkdev.h> 15 #include <linux/kthread.h> 16 #include <linux/export.h> 17 #include <linux/namei.h> 18 #include <linux/mount.h> 19 #include <linux/gfs2_ondisk.h> 20 #include <linux/quotaops.h> 21 #include <linux/lockdep.h> 22 #include <linux/module.h> 23 #include <linux/backing-dev.h> 24 #include <linux/fs_parser.h> 25 26 #include "gfs2.h" 27 #include "incore.h" 28 #include "bmap.h" 29 #include "glock.h" 30 #include "glops.h" 31 #include "inode.h" 32 #include "recovery.h" 33 #include "rgrp.h" 34 #include "super.h" 35 #include "sys.h" 36 #include "util.h" 37 #include "log.h" 38 #include "quota.h" 39 #include "dir.h" 40 #include "meta_io.h" 41 #include "trace_gfs2.h" 42 #include "lops.h" 43 44 #define DO 0 45 #define UNDO 1 46 47 /** 48 * gfs2_tune_init - Fill a gfs2_tune structure with default values 49 * @gt: tune 50 * 51 */ 52 53 static void gfs2_tune_init(struct gfs2_tune *gt) 54 { 55 spin_lock_init(>->gt_spin); 56 57 gt->gt_quota_warn_period = 10; 58 gt->gt_quota_scale_num = 1; 59 gt->gt_quota_scale_den = 1; 60 gt->gt_new_files_jdata = 0; 61 gt->gt_max_readahead = BIT(18); 62 gt->gt_complain_secs = 10; 63 } 64 65 void free_sbd(struct gfs2_sbd *sdp) 66 { 67 if (sdp->sd_lkstats) 68 free_percpu(sdp->sd_lkstats); 69 kfree(sdp); 70 } 71 72 static struct gfs2_sbd *init_sbd(struct super_block *sb) 73 { 74 struct gfs2_sbd *sdp; 75 struct address_space *mapping; 76 77 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); 78 if (!sdp) 79 return NULL; 80 81 sdp->sd_vfs = sb; 82 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats); 83 if (!sdp->sd_lkstats) 84 goto fail; 85 sb->s_fs_info = sdp; 86 87 set_bit(SDF_NOJOURNALID, &sdp->sd_flags); 88 gfs2_tune_init(&sdp->sd_tune); 89 90 init_waitqueue_head(&sdp->sd_glock_wait); 91 init_waitqueue_head(&sdp->sd_async_glock_wait); 92 atomic_set(&sdp->sd_glock_disposal, 0); 93 init_completion(&sdp->sd_locking_init); 94 init_completion(&sdp->sd_wdack); 95 spin_lock_init(&sdp->sd_statfs_spin); 96 97 spin_lock_init(&sdp->sd_rindex_spin); 98 sdp->sd_rindex_tree.rb_node = NULL; 99 100 INIT_LIST_HEAD(&sdp->sd_jindex_list); 101 spin_lock_init(&sdp->sd_jindex_spin); 102 mutex_init(&sdp->sd_jindex_mutex); 103 init_completion(&sdp->sd_journal_ready); 104 105 INIT_LIST_HEAD(&sdp->sd_quota_list); 106 mutex_init(&sdp->sd_quota_mutex); 107 mutex_init(&sdp->sd_quota_sync_mutex); 108 init_waitqueue_head(&sdp->sd_quota_wait); 109 spin_lock_init(&sdp->sd_bitmap_lock); 110 111 INIT_LIST_HEAD(&sdp->sd_sc_inodes_list); 112 113 mapping = &sdp->sd_aspace; 114 115 address_space_init_once(mapping); 116 mapping->a_ops = &gfs2_rgrp_aops; 117 mapping->host = sb->s_bdev->bd_inode; 118 mapping->flags = 0; 119 mapping_set_gfp_mask(mapping, GFP_NOFS); 120 mapping->private_data = NULL; 121 mapping->writeback_index = 0; 122 123 spin_lock_init(&sdp->sd_log_lock); 124 atomic_set(&sdp->sd_log_pinned, 0); 125 INIT_LIST_HEAD(&sdp->sd_log_revokes); 126 INIT_LIST_HEAD(&sdp->sd_log_ordered); 127 spin_lock_init(&sdp->sd_ordered_lock); 128 129 init_waitqueue_head(&sdp->sd_log_waitq); 130 init_waitqueue_head(&sdp->sd_logd_waitq); 131 spin_lock_init(&sdp->sd_ail_lock); 132 INIT_LIST_HEAD(&sdp->sd_ail1_list); 133 INIT_LIST_HEAD(&sdp->sd_ail2_list); 134 135 init_rwsem(&sdp->sd_log_flush_lock); 136 atomic_set(&sdp->sd_log_in_flight, 0); 137 init_waitqueue_head(&sdp->sd_log_flush_wait); 138 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 139 mutex_init(&sdp->sd_freeze_mutex); 140 141 return sdp; 142 143 fail: 144 free_sbd(sdp); 145 return NULL; 146 } 147 148 /** 149 * gfs2_check_sb - Check superblock 150 * @sdp: the filesystem 151 * @silent: Don't print a message if the check fails 152 * 153 * Checks the version code of the FS is one that we understand how to 154 * read and that the sizes of the various on-disk structures have not 155 * changed. 156 */ 157 158 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 159 { 160 struct gfs2_sb_host *sb = &sdp->sd_sb; 161 162 if (sb->sb_magic != GFS2_MAGIC || 163 sb->sb_type != GFS2_METATYPE_SB) { 164 if (!silent) 165 pr_warn("not a GFS2 filesystem\n"); 166 return -EINVAL; 167 } 168 169 if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN || 170 sb->sb_fs_format > GFS2_FS_FORMAT_MAX || 171 sb->sb_multihost_format != GFS2_FORMAT_MULTI) { 172 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 173 return -EINVAL; 174 } 175 176 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE || 177 (sb->sb_bsize & (sb->sb_bsize - 1))) { 178 pr_warn("Invalid block size\n"); 179 return -EINVAL; 180 } 181 182 return 0; 183 } 184 185 static void end_bio_io_page(struct bio *bio) 186 { 187 struct page *page = bio->bi_private; 188 189 if (!bio->bi_status) 190 SetPageUptodate(page); 191 else 192 pr_warn("error %d reading superblock\n", bio->bi_status); 193 unlock_page(page); 194 } 195 196 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 197 { 198 struct gfs2_sb_host *sb = &sdp->sd_sb; 199 struct super_block *s = sdp->sd_vfs; 200 const struct gfs2_sb *str = buf; 201 202 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 203 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 204 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 205 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 206 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 207 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 208 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 209 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 210 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 211 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 212 213 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 214 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 215 memcpy(&s->s_uuid, str->sb_uuid, 16); 216 } 217 218 /** 219 * gfs2_read_super - Read the gfs2 super block from disk 220 * @sdp: The GFS2 super block 221 * @sector: The location of the super block 222 * @silent: Don't print a message if the check fails 223 * 224 * This uses the bio functions to read the super block from disk 225 * because we want to be 100% sure that we never read cached data. 226 * A super block is read twice only during each GFS2 mount and is 227 * never written to by the filesystem. The first time its read no 228 * locks are held, and the only details which are looked at are those 229 * relating to the locking protocol. Once locking is up and working, 230 * the sb is read again under the lock to establish the location of 231 * the master directory (contains pointers to journals etc) and the 232 * root directory. 233 * 234 * Returns: 0 on success or error 235 */ 236 237 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 238 { 239 struct super_block *sb = sdp->sd_vfs; 240 struct gfs2_sb *p; 241 struct page *page; 242 struct bio *bio; 243 244 page = alloc_page(GFP_NOFS); 245 if (unlikely(!page)) 246 return -ENOMEM; 247 248 ClearPageUptodate(page); 249 ClearPageDirty(page); 250 lock_page(page); 251 252 bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS); 253 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 254 bio_add_page(bio, page, PAGE_SIZE, 0); 255 256 bio->bi_end_io = end_bio_io_page; 257 bio->bi_private = page; 258 submit_bio(bio); 259 wait_on_page_locked(page); 260 bio_put(bio); 261 if (!PageUptodate(page)) { 262 __free_page(page); 263 return -EIO; 264 } 265 p = kmap(page); 266 gfs2_sb_in(sdp, p); 267 kunmap(page); 268 __free_page(page); 269 return gfs2_check_sb(sdp, silent); 270 } 271 272 /** 273 * gfs2_read_sb - Read super block 274 * @sdp: The GFS2 superblock 275 * @silent: Don't print message if mount fails 276 * 277 */ 278 279 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 280 { 281 u32 hash_blocks, ind_blocks, leaf_blocks; 282 u32 tmp_blocks; 283 unsigned int x; 284 int error; 285 286 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 287 if (error) { 288 if (!silent) 289 fs_err(sdp, "can't read superblock\n"); 290 return error; 291 } 292 293 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 294 GFS2_BASIC_BLOCK_SHIFT; 295 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 296 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 297 sizeof(struct gfs2_dinode)) / sizeof(u64); 298 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 299 sizeof(struct gfs2_meta_header)) / sizeof(u64); 300 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize - 301 sizeof(struct gfs2_log_descriptor)) / sizeof(u64); 302 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 303 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 304 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 305 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 306 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 307 sizeof(struct gfs2_meta_header)) / 308 sizeof(struct gfs2_quota_change); 309 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 310 sizeof(struct gfs2_meta_header)) 311 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 312 313 /* 314 * We always keep at least one block reserved for revokes in 315 * transactions. This greatly simplifies allocating additional 316 * revoke blocks. 317 */ 318 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs); 319 320 /* Compute maximum reservation required to add a entry to a directory */ 321 322 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 323 sdp->sd_jbsize); 324 325 ind_blocks = 0; 326 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 327 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 328 ind_blocks += tmp_blocks; 329 } 330 331 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 332 333 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 334 335 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 336 sizeof(struct gfs2_dinode); 337 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 338 for (x = 2;; x++) { 339 u64 space, d; 340 u32 m; 341 342 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 343 d = space; 344 m = do_div(d, sdp->sd_inptrs); 345 346 if (d != sdp->sd_heightsize[x - 1] || m) 347 break; 348 sdp->sd_heightsize[x] = space; 349 } 350 sdp->sd_max_height = x; 351 sdp->sd_heightsize[x] = ~0; 352 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 353 354 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 355 sizeof(struct gfs2_leaf)) / 356 GFS2_MIN_DIRENT_SIZE; 357 return 0; 358 } 359 360 static int init_names(struct gfs2_sbd *sdp, int silent) 361 { 362 char *proto, *table; 363 int error = 0; 364 365 proto = sdp->sd_args.ar_lockproto; 366 table = sdp->sd_args.ar_locktable; 367 368 /* Try to autodetect */ 369 370 if (!proto[0] || !table[0]) { 371 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 372 if (error) 373 return error; 374 375 if (!proto[0]) 376 proto = sdp->sd_sb.sb_lockproto; 377 if (!table[0]) 378 table = sdp->sd_sb.sb_locktable; 379 } 380 381 if (!table[0]) 382 table = sdp->sd_vfs->s_id; 383 384 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 385 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 386 387 table = sdp->sd_table_name; 388 while ((table = strchr(table, '/'))) 389 *table = '_'; 390 391 return error; 392 } 393 394 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 395 int undo) 396 { 397 int error = 0; 398 399 if (undo) 400 goto fail_trans; 401 402 error = gfs2_glock_nq_num(sdp, 403 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 404 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 405 mount_gh); 406 if (error) { 407 fs_err(sdp, "can't acquire mount glock: %d\n", error); 408 goto fail; 409 } 410 411 error = gfs2_glock_nq_num(sdp, 412 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 413 LM_ST_SHARED, 414 LM_FLAG_NOEXP | GL_EXACT, 415 &sdp->sd_live_gh); 416 if (error) { 417 fs_err(sdp, "can't acquire live glock: %d\n", error); 418 goto fail_mount; 419 } 420 421 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 422 CREATE, &sdp->sd_rename_gl); 423 if (error) { 424 fs_err(sdp, "can't create rename glock: %d\n", error); 425 goto fail_live; 426 } 427 428 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 429 CREATE, &sdp->sd_freeze_gl); 430 if (error) { 431 fs_err(sdp, "can't create transaction glock: %d\n", error); 432 goto fail_rename; 433 } 434 435 return 0; 436 437 fail_trans: 438 gfs2_glock_put(sdp->sd_freeze_gl); 439 fail_rename: 440 gfs2_glock_put(sdp->sd_rename_gl); 441 fail_live: 442 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 443 fail_mount: 444 gfs2_glock_dq_uninit(mount_gh); 445 fail: 446 return error; 447 } 448 449 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 450 u64 no_addr, const char *name) 451 { 452 struct gfs2_sbd *sdp = sb->s_fs_info; 453 struct dentry *dentry; 454 struct inode *inode; 455 456 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 457 GFS2_BLKST_FREE /* ignore */); 458 if (IS_ERR(inode)) { 459 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 460 return PTR_ERR(inode); 461 } 462 dentry = d_make_root(inode); 463 if (!dentry) { 464 fs_err(sdp, "can't alloc %s dentry\n", name); 465 return -ENOMEM; 466 } 467 *dptr = dentry; 468 return 0; 469 } 470 471 static int init_sb(struct gfs2_sbd *sdp, int silent) 472 { 473 struct super_block *sb = sdp->sd_vfs; 474 struct gfs2_holder sb_gh; 475 u64 no_addr; 476 int ret; 477 478 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 479 LM_ST_SHARED, 0, &sb_gh); 480 if (ret) { 481 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 482 return ret; 483 } 484 485 ret = gfs2_read_sb(sdp, silent); 486 if (ret) { 487 fs_err(sdp, "can't read superblock: %d\n", ret); 488 goto out; 489 } 490 491 switch(sdp->sd_sb.sb_fs_format) { 492 case GFS2_FS_FORMAT_MAX: 493 sb->s_xattr = gfs2_xattr_handlers_max; 494 break; 495 496 case GFS2_FS_FORMAT_MIN: 497 sb->s_xattr = gfs2_xattr_handlers_min; 498 break; 499 500 default: 501 BUG(); 502 } 503 504 /* Set up the buffer cache and SB for real */ 505 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 506 ret = -EINVAL; 507 fs_err(sdp, "FS block size (%u) is too small for device " 508 "block size (%u)\n", 509 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 510 goto out; 511 } 512 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 513 ret = -EINVAL; 514 fs_err(sdp, "FS block size (%u) is too big for machine " 515 "page size (%u)\n", 516 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 517 goto out; 518 } 519 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 520 521 /* Get the root inode */ 522 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 523 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 524 if (ret) 525 goto out; 526 527 /* Get the master inode */ 528 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 529 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 530 if (ret) { 531 dput(sdp->sd_root_dir); 532 goto out; 533 } 534 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 535 out: 536 gfs2_glock_dq_uninit(&sb_gh); 537 return ret; 538 } 539 540 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 541 { 542 char *message = "FIRSTMOUNT=Done"; 543 char *envp[] = { message, NULL }; 544 545 fs_info(sdp, "first mount done, others may mount\n"); 546 547 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 548 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 549 550 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 551 } 552 553 /** 554 * gfs2_jindex_hold - Grab a lock on the jindex 555 * @sdp: The GFS2 superblock 556 * @ji_gh: the holder for the jindex glock 557 * 558 * Returns: errno 559 */ 560 561 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 562 { 563 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 564 struct qstr name; 565 char buf[20]; 566 struct gfs2_jdesc *jd; 567 int error; 568 569 name.name = buf; 570 571 mutex_lock(&sdp->sd_jindex_mutex); 572 573 for (;;) { 574 struct gfs2_inode *jip; 575 576 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 577 if (error) 578 break; 579 580 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 581 name.hash = gfs2_disk_hash(name.name, name.len); 582 583 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 584 if (error == -ENOENT) { 585 error = 0; 586 break; 587 } 588 589 gfs2_glock_dq_uninit(ji_gh); 590 591 if (error) 592 break; 593 594 error = -ENOMEM; 595 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 596 if (!jd) 597 break; 598 599 INIT_LIST_HEAD(&jd->extent_list); 600 INIT_LIST_HEAD(&jd->jd_revoke_list); 601 602 INIT_WORK(&jd->jd_work, gfs2_recover_func); 603 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 604 if (IS_ERR_OR_NULL(jd->jd_inode)) { 605 if (!jd->jd_inode) 606 error = -ENOENT; 607 else 608 error = PTR_ERR(jd->jd_inode); 609 kfree(jd); 610 break; 611 } 612 613 d_mark_dontcache(jd->jd_inode); 614 spin_lock(&sdp->sd_jindex_spin); 615 jd->jd_jid = sdp->sd_journals++; 616 jip = GFS2_I(jd->jd_inode); 617 jd->jd_no_addr = jip->i_no_addr; 618 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 619 spin_unlock(&sdp->sd_jindex_spin); 620 } 621 622 mutex_unlock(&sdp->sd_jindex_mutex); 623 624 return error; 625 } 626 627 /** 628 * init_statfs - look up and initialize master and local (per node) statfs inodes 629 * @sdp: The GFS2 superblock 630 * 631 * This should be called after the jindex is initialized in init_journal() and 632 * before gfs2_journal_recovery() is called because we need to be able to write 633 * to these inodes during recovery. 634 * 635 * Returns: errno 636 */ 637 static int init_statfs(struct gfs2_sbd *sdp) 638 { 639 int error = 0; 640 struct inode *master = d_inode(sdp->sd_master_dir); 641 struct inode *pn = NULL; 642 char buf[30]; 643 struct gfs2_jdesc *jd; 644 struct gfs2_inode *ip; 645 646 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 647 if (IS_ERR(sdp->sd_statfs_inode)) { 648 error = PTR_ERR(sdp->sd_statfs_inode); 649 fs_err(sdp, "can't read in statfs inode: %d\n", error); 650 goto out; 651 } 652 if (sdp->sd_args.ar_spectator) 653 goto out; 654 655 pn = gfs2_lookup_simple(master, "per_node"); 656 if (IS_ERR(pn)) { 657 error = PTR_ERR(pn); 658 fs_err(sdp, "can't find per_node directory: %d\n", error); 659 goto put_statfs; 660 } 661 662 /* For each jid, lookup the corresponding local statfs inode in the 663 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */ 664 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 665 struct local_statfs_inode *lsi = 666 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS); 667 if (!lsi) { 668 error = -ENOMEM; 669 goto free_local; 670 } 671 sprintf(buf, "statfs_change%u", jd->jd_jid); 672 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf); 673 if (IS_ERR(lsi->si_sc_inode)) { 674 error = PTR_ERR(lsi->si_sc_inode); 675 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n", 676 jd->jd_jid, error); 677 kfree(lsi); 678 goto free_local; 679 } 680 lsi->si_jid = jd->jd_jid; 681 if (jd->jd_jid == sdp->sd_jdesc->jd_jid) 682 sdp->sd_sc_inode = lsi->si_sc_inode; 683 684 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list); 685 } 686 687 iput(pn); 688 pn = NULL; 689 ip = GFS2_I(sdp->sd_sc_inode); 690 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 691 &sdp->sd_sc_gh); 692 if (error) { 693 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 694 goto free_local; 695 } 696 /* read in the local statfs buffer - other nodes don't change it. */ 697 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh); 698 if (error) { 699 fs_err(sdp, "Cannot read in local statfs: %d\n", error); 700 goto unlock_sd_gh; 701 } 702 return 0; 703 704 unlock_sd_gh: 705 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 706 free_local: 707 free_local_statfs_inodes(sdp); 708 iput(pn); 709 put_statfs: 710 iput(sdp->sd_statfs_inode); 711 out: 712 return error; 713 } 714 715 /* Uninitialize and free up memory used by the list of statfs inodes */ 716 static void uninit_statfs(struct gfs2_sbd *sdp) 717 { 718 if (!sdp->sd_args.ar_spectator) { 719 brelse(sdp->sd_sc_bh); 720 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 721 free_local_statfs_inodes(sdp); 722 } 723 iput(sdp->sd_statfs_inode); 724 } 725 726 static int init_journal(struct gfs2_sbd *sdp, int undo) 727 { 728 struct inode *master = d_inode(sdp->sd_master_dir); 729 struct gfs2_holder ji_gh; 730 struct gfs2_inode *ip; 731 int jindex = 1; 732 int error = 0; 733 734 if (undo) { 735 jindex = 0; 736 goto fail_statfs; 737 } 738 739 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 740 if (IS_ERR(sdp->sd_jindex)) { 741 fs_err(sdp, "can't lookup journal index: %d\n", error); 742 return PTR_ERR(sdp->sd_jindex); 743 } 744 745 /* Load in the journal index special file */ 746 747 error = gfs2_jindex_hold(sdp, &ji_gh); 748 if (error) { 749 fs_err(sdp, "can't read journal index: %d\n", error); 750 goto fail; 751 } 752 753 error = -EUSERS; 754 if (!gfs2_jindex_size(sdp)) { 755 fs_err(sdp, "no journals!\n"); 756 goto fail_jindex; 757 } 758 759 atomic_set(&sdp->sd_log_blks_needed, 0); 760 if (sdp->sd_args.ar_spectator) { 761 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 762 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 763 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 764 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 765 } else { 766 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 767 fs_err(sdp, "can't mount journal #%u\n", 768 sdp->sd_lockstruct.ls_jid); 769 fs_err(sdp, "there are only %u journals (0 - %u)\n", 770 gfs2_jindex_size(sdp), 771 gfs2_jindex_size(sdp) - 1); 772 goto fail_jindex; 773 } 774 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 775 776 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 777 &gfs2_journal_glops, 778 LM_ST_EXCLUSIVE, 779 LM_FLAG_NOEXP | GL_NOCACHE, 780 &sdp->sd_journal_gh); 781 if (error) { 782 fs_err(sdp, "can't acquire journal glock: %d\n", error); 783 goto fail_jindex; 784 } 785 786 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 787 sdp->sd_jinode_gl = ip->i_gl; 788 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 789 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 790 &sdp->sd_jinode_gh); 791 if (error) { 792 fs_err(sdp, "can't acquire journal inode glock: %d\n", 793 error); 794 goto fail_journal_gh; 795 } 796 797 error = gfs2_jdesc_check(sdp->sd_jdesc); 798 if (error) { 799 fs_err(sdp, "my journal (%u) is bad: %d\n", 800 sdp->sd_jdesc->jd_jid, error); 801 goto fail_jinode_gh; 802 } 803 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 804 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 805 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 806 807 /* Map the extents for this journal's blocks */ 808 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 809 } 810 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 811 812 /* Lookup statfs inodes here so journal recovery can use them. */ 813 error = init_statfs(sdp); 814 if (error) 815 goto fail_jinode_gh; 816 817 if (sdp->sd_lockstruct.ls_first) { 818 unsigned int x; 819 for (x = 0; x < sdp->sd_journals; x++) { 820 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 821 822 if (sdp->sd_args.ar_spectator) { 823 error = check_journal_clean(sdp, jd, true); 824 if (error) 825 goto fail_statfs; 826 continue; 827 } 828 error = gfs2_recover_journal(jd, true); 829 if (error) { 830 fs_err(sdp, "error recovering journal %u: %d\n", 831 x, error); 832 goto fail_statfs; 833 } 834 } 835 836 gfs2_others_may_mount(sdp); 837 } else if (!sdp->sd_args.ar_spectator) { 838 error = gfs2_recover_journal(sdp->sd_jdesc, true); 839 if (error) { 840 fs_err(sdp, "error recovering my journal: %d\n", error); 841 goto fail_statfs; 842 } 843 } 844 845 sdp->sd_log_idle = 1; 846 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 847 gfs2_glock_dq_uninit(&ji_gh); 848 jindex = 0; 849 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 850 return 0; 851 852 fail_statfs: 853 uninit_statfs(sdp); 854 fail_jinode_gh: 855 /* A withdraw may have done dq/uninit so now we need to check it */ 856 if (!sdp->sd_args.ar_spectator && 857 gfs2_holder_initialized(&sdp->sd_jinode_gh)) 858 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 859 fail_journal_gh: 860 if (!sdp->sd_args.ar_spectator && 861 gfs2_holder_initialized(&sdp->sd_journal_gh)) 862 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 863 fail_jindex: 864 gfs2_jindex_free(sdp); 865 if (jindex) 866 gfs2_glock_dq_uninit(&ji_gh); 867 fail: 868 iput(sdp->sd_jindex); 869 return error; 870 } 871 872 static struct lock_class_key gfs2_quota_imutex_key; 873 874 static int init_inodes(struct gfs2_sbd *sdp, int undo) 875 { 876 int error = 0; 877 struct inode *master = d_inode(sdp->sd_master_dir); 878 879 if (undo) 880 goto fail_qinode; 881 882 error = init_journal(sdp, undo); 883 complete_all(&sdp->sd_journal_ready); 884 if (error) 885 goto fail; 886 887 /* Read in the resource index inode */ 888 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 889 if (IS_ERR(sdp->sd_rindex)) { 890 error = PTR_ERR(sdp->sd_rindex); 891 fs_err(sdp, "can't get resource index inode: %d\n", error); 892 goto fail_journal; 893 } 894 sdp->sd_rindex_uptodate = 0; 895 896 /* Read in the quota inode */ 897 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 898 if (IS_ERR(sdp->sd_quota_inode)) { 899 error = PTR_ERR(sdp->sd_quota_inode); 900 fs_err(sdp, "can't get quota file inode: %d\n", error); 901 goto fail_rindex; 902 } 903 /* 904 * i_rwsem on quota files is special. Since this inode is hidden system 905 * file, we are safe to define locking ourselves. 906 */ 907 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 908 &gfs2_quota_imutex_key); 909 910 error = gfs2_rindex_update(sdp); 911 if (error) 912 goto fail_qinode; 913 914 return 0; 915 916 fail_qinode: 917 iput(sdp->sd_quota_inode); 918 fail_rindex: 919 gfs2_clear_rgrpd(sdp); 920 iput(sdp->sd_rindex); 921 fail_journal: 922 init_journal(sdp, UNDO); 923 fail: 924 return error; 925 } 926 927 static int init_per_node(struct gfs2_sbd *sdp, int undo) 928 { 929 struct inode *pn = NULL; 930 char buf[30]; 931 int error = 0; 932 struct gfs2_inode *ip; 933 struct inode *master = d_inode(sdp->sd_master_dir); 934 935 if (sdp->sd_args.ar_spectator) 936 return 0; 937 938 if (undo) 939 goto fail_qc_gh; 940 941 pn = gfs2_lookup_simple(master, "per_node"); 942 if (IS_ERR(pn)) { 943 error = PTR_ERR(pn); 944 fs_err(sdp, "can't find per_node directory: %d\n", error); 945 return error; 946 } 947 948 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 949 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 950 if (IS_ERR(sdp->sd_qc_inode)) { 951 error = PTR_ERR(sdp->sd_qc_inode); 952 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 953 goto fail_ut_i; 954 } 955 956 iput(pn); 957 pn = NULL; 958 959 ip = GFS2_I(sdp->sd_qc_inode); 960 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 961 &sdp->sd_qc_gh); 962 if (error) { 963 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 964 goto fail_qc_i; 965 } 966 967 return 0; 968 969 fail_qc_gh: 970 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 971 fail_qc_i: 972 iput(sdp->sd_qc_inode); 973 fail_ut_i: 974 iput(pn); 975 return error; 976 } 977 978 static const match_table_t nolock_tokens = { 979 { Opt_jid, "jid=%d", }, 980 { Opt_err, NULL }, 981 }; 982 983 static const struct lm_lockops nolock_ops = { 984 .lm_proto_name = "lock_nolock", 985 .lm_put_lock = gfs2_glock_free, 986 .lm_tokens = &nolock_tokens, 987 }; 988 989 /** 990 * gfs2_lm_mount - mount a locking protocol 991 * @sdp: the filesystem 992 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 993 * 994 * Returns: errno 995 */ 996 997 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 998 { 999 const struct lm_lockops *lm; 1000 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 1001 struct gfs2_args *args = &sdp->sd_args; 1002 const char *proto = sdp->sd_proto_name; 1003 const char *table = sdp->sd_table_name; 1004 char *o, *options; 1005 int ret; 1006 1007 if (!strcmp("lock_nolock", proto)) { 1008 lm = &nolock_ops; 1009 sdp->sd_args.ar_localflocks = 1; 1010 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 1011 } else if (!strcmp("lock_dlm", proto)) { 1012 lm = &gfs2_dlm_ops; 1013 #endif 1014 } else { 1015 pr_info("can't find protocol %s\n", proto); 1016 return -ENOENT; 1017 } 1018 1019 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 1020 1021 ls->ls_ops = lm; 1022 ls->ls_first = 1; 1023 1024 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 1025 substring_t tmp[MAX_OPT_ARGS]; 1026 int token, option; 1027 1028 if (!o || !*o) 1029 continue; 1030 1031 token = match_token(o, *lm->lm_tokens, tmp); 1032 switch (token) { 1033 case Opt_jid: 1034 ret = match_int(&tmp[0], &option); 1035 if (ret || option < 0) 1036 goto hostdata_error; 1037 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 1038 ls->ls_jid = option; 1039 break; 1040 case Opt_id: 1041 case Opt_nodir: 1042 /* Obsolete, but left for backward compat purposes */ 1043 break; 1044 case Opt_first: 1045 ret = match_int(&tmp[0], &option); 1046 if (ret || (option != 0 && option != 1)) 1047 goto hostdata_error; 1048 ls->ls_first = option; 1049 break; 1050 case Opt_err: 1051 default: 1052 hostdata_error: 1053 fs_info(sdp, "unknown hostdata (%s)\n", o); 1054 return -EINVAL; 1055 } 1056 } 1057 1058 if (lm->lm_mount == NULL) { 1059 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format); 1060 complete_all(&sdp->sd_locking_init); 1061 return 0; 1062 } 1063 ret = lm->lm_mount(sdp, table); 1064 if (ret == 0) 1065 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n", 1066 sdp->sd_sb.sb_fs_format); 1067 complete_all(&sdp->sd_locking_init); 1068 return ret; 1069 } 1070 1071 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1072 { 1073 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1074 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount) 1075 lm->lm_unmount(sdp); 1076 } 1077 1078 static int wait_on_journal(struct gfs2_sbd *sdp) 1079 { 1080 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1081 return 0; 1082 1083 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1084 ? -EINTR : 0; 1085 } 1086 1087 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1088 { 1089 struct super_block *sb = sdp->sd_vfs; 1090 char ro[20]; 1091 char spectator[20]; 1092 char *envp[] = { ro, spectator, NULL }; 1093 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1094 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1095 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1096 } 1097 1098 static int init_threads(struct gfs2_sbd *sdp) 1099 { 1100 struct task_struct *p; 1101 int error = 0; 1102 1103 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 1104 if (IS_ERR(p)) { 1105 error = PTR_ERR(p); 1106 fs_err(sdp, "can't start logd thread: %d\n", error); 1107 return error; 1108 } 1109 sdp->sd_logd_process = p; 1110 1111 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 1112 if (IS_ERR(p)) { 1113 error = PTR_ERR(p); 1114 fs_err(sdp, "can't start quotad thread: %d\n", error); 1115 goto fail; 1116 } 1117 sdp->sd_quotad_process = p; 1118 return 0; 1119 1120 fail: 1121 kthread_stop(sdp->sd_logd_process); 1122 sdp->sd_logd_process = NULL; 1123 return error; 1124 } 1125 1126 /** 1127 * gfs2_fill_super - Read in superblock 1128 * @sb: The VFS superblock 1129 * @fc: Mount options and flags 1130 * 1131 * Returns: -errno 1132 */ 1133 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1134 { 1135 struct gfs2_args *args = fc->fs_private; 1136 int silent = fc->sb_flags & SB_SILENT; 1137 struct gfs2_sbd *sdp; 1138 struct gfs2_holder mount_gh; 1139 struct gfs2_holder freeze_gh; 1140 int error; 1141 1142 sdp = init_sbd(sb); 1143 if (!sdp) { 1144 pr_warn("can't alloc struct gfs2_sbd\n"); 1145 return -ENOMEM; 1146 } 1147 sdp->sd_args = *args; 1148 1149 if (sdp->sd_args.ar_spectator) { 1150 sb->s_flags |= SB_RDONLY; 1151 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1152 } 1153 if (sdp->sd_args.ar_posix_acl) 1154 sb->s_flags |= SB_POSIXACL; 1155 if (sdp->sd_args.ar_nobarrier) 1156 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1157 1158 sb->s_flags |= SB_NOSEC; 1159 sb->s_magic = GFS2_MAGIC; 1160 sb->s_op = &gfs2_super_ops; 1161 sb->s_d_op = &gfs2_dops; 1162 sb->s_export_op = &gfs2_export_ops; 1163 sb->s_qcop = &gfs2_quotactl_ops; 1164 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1165 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1166 sb->s_time_gran = 1; 1167 sb->s_maxbytes = MAX_LFS_FILESIZE; 1168 1169 /* Set up the buffer cache and fill in some fake block size values 1170 to allow us to read-in the on-disk superblock. */ 1171 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1172 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1173 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1174 GFS2_BASIC_BLOCK_SHIFT; 1175 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1176 1177 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1178 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1179 if (sdp->sd_args.ar_statfs_quantum) { 1180 sdp->sd_tune.gt_statfs_slow = 0; 1181 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1182 } else { 1183 sdp->sd_tune.gt_statfs_slow = 1; 1184 sdp->sd_tune.gt_statfs_quantum = 30; 1185 } 1186 1187 error = init_names(sdp, silent); 1188 if (error) 1189 goto fail_free; 1190 1191 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1192 1193 error = gfs2_sys_fs_add(sdp); 1194 if (error) 1195 goto fail_free; 1196 1197 gfs2_create_debugfs_file(sdp); 1198 1199 error = gfs2_lm_mount(sdp, silent); 1200 if (error) 1201 goto fail_debug; 1202 1203 error = init_locking(sdp, &mount_gh, DO); 1204 if (error) 1205 goto fail_lm; 1206 1207 error = init_sb(sdp, silent); 1208 if (error) 1209 goto fail_locking; 1210 1211 /* Turn rgrplvb on by default if fs format is recent enough */ 1212 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801) 1213 sdp->sd_args.ar_rgrplvb = 1; 1214 1215 error = wait_on_journal(sdp); 1216 if (error) 1217 goto fail_sb; 1218 1219 /* 1220 * If user space has failed to join the cluster or some similar 1221 * failure has occurred, then the journal id will contain a 1222 * negative (error) number. This will then be returned to the 1223 * caller (of the mount syscall). We do this even for spectator 1224 * mounts (which just write a jid of 0 to indicate "ok" even though 1225 * the jid is unused in the spectator case) 1226 */ 1227 if (sdp->sd_lockstruct.ls_jid < 0) { 1228 error = sdp->sd_lockstruct.ls_jid; 1229 sdp->sd_lockstruct.ls_jid = 0; 1230 goto fail_sb; 1231 } 1232 1233 if (sdp->sd_args.ar_spectator) 1234 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1235 sdp->sd_table_name); 1236 else 1237 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1238 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1239 1240 error = init_inodes(sdp, DO); 1241 if (error) 1242 goto fail_sb; 1243 1244 error = init_per_node(sdp, DO); 1245 if (error) 1246 goto fail_inodes; 1247 1248 error = gfs2_statfs_init(sdp); 1249 if (error) { 1250 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1251 goto fail_per_node; 1252 } 1253 1254 if (!sb_rdonly(sb)) { 1255 error = init_threads(sdp); 1256 if (error) { 1257 gfs2_withdraw_delayed(sdp); 1258 goto fail_per_node; 1259 } 1260 } 1261 1262 error = gfs2_freeze_lock(sdp, &freeze_gh, 0); 1263 if (error) 1264 goto fail_per_node; 1265 1266 if (!sb_rdonly(sb)) 1267 error = gfs2_make_fs_rw(sdp); 1268 1269 gfs2_freeze_unlock(&freeze_gh); 1270 if (error) { 1271 if (sdp->sd_quotad_process) 1272 kthread_stop(sdp->sd_quotad_process); 1273 sdp->sd_quotad_process = NULL; 1274 if (sdp->sd_logd_process) 1275 kthread_stop(sdp->sd_logd_process); 1276 sdp->sd_logd_process = NULL; 1277 fs_err(sdp, "can't make FS RW: %d\n", error); 1278 goto fail_per_node; 1279 } 1280 gfs2_glock_dq_uninit(&mount_gh); 1281 gfs2_online_uevent(sdp); 1282 return 0; 1283 1284 fail_per_node: 1285 init_per_node(sdp, UNDO); 1286 fail_inodes: 1287 init_inodes(sdp, UNDO); 1288 fail_sb: 1289 if (sdp->sd_root_dir) 1290 dput(sdp->sd_root_dir); 1291 if (sdp->sd_master_dir) 1292 dput(sdp->sd_master_dir); 1293 if (sb->s_root) 1294 dput(sb->s_root); 1295 sb->s_root = NULL; 1296 fail_locking: 1297 init_locking(sdp, &mount_gh, UNDO); 1298 fail_lm: 1299 complete_all(&sdp->sd_journal_ready); 1300 gfs2_gl_hash_clear(sdp); 1301 gfs2_lm_unmount(sdp); 1302 fail_debug: 1303 gfs2_delete_debugfs_file(sdp); 1304 gfs2_sys_fs_del(sdp); 1305 fail_free: 1306 free_sbd(sdp); 1307 sb->s_fs_info = NULL; 1308 return error; 1309 } 1310 1311 /** 1312 * gfs2_get_tree - Get the GFS2 superblock and root directory 1313 * @fc: The filesystem context 1314 * 1315 * Returns: 0 or -errno on error 1316 */ 1317 static int gfs2_get_tree(struct fs_context *fc) 1318 { 1319 struct gfs2_args *args = fc->fs_private; 1320 struct gfs2_sbd *sdp; 1321 int error; 1322 1323 error = get_tree_bdev(fc, gfs2_fill_super); 1324 if (error) 1325 return error; 1326 1327 sdp = fc->root->d_sb->s_fs_info; 1328 dput(fc->root); 1329 if (args->ar_meta) 1330 fc->root = dget(sdp->sd_master_dir); 1331 else 1332 fc->root = dget(sdp->sd_root_dir); 1333 return 0; 1334 } 1335 1336 static void gfs2_fc_free(struct fs_context *fc) 1337 { 1338 struct gfs2_args *args = fc->fs_private; 1339 1340 kfree(args); 1341 } 1342 1343 enum gfs2_param { 1344 Opt_lockproto, 1345 Opt_locktable, 1346 Opt_hostdata, 1347 Opt_spectator, 1348 Opt_ignore_local_fs, 1349 Opt_localflocks, 1350 Opt_localcaching, 1351 Opt_debug, 1352 Opt_upgrade, 1353 Opt_acl, 1354 Opt_quota, 1355 Opt_quota_flag, 1356 Opt_suiddir, 1357 Opt_data, 1358 Opt_meta, 1359 Opt_discard, 1360 Opt_commit, 1361 Opt_errors, 1362 Opt_statfs_quantum, 1363 Opt_statfs_percent, 1364 Opt_quota_quantum, 1365 Opt_barrier, 1366 Opt_rgrplvb, 1367 Opt_loccookie, 1368 }; 1369 1370 static const struct constant_table gfs2_param_quota[] = { 1371 {"off", GFS2_QUOTA_OFF}, 1372 {"account", GFS2_QUOTA_ACCOUNT}, 1373 {"on", GFS2_QUOTA_ON}, 1374 {} 1375 }; 1376 1377 enum opt_data { 1378 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1379 Opt_data_ordered = GFS2_DATA_ORDERED, 1380 }; 1381 1382 static const struct constant_table gfs2_param_data[] = { 1383 {"writeback", Opt_data_writeback }, 1384 {"ordered", Opt_data_ordered }, 1385 {} 1386 }; 1387 1388 enum opt_errors { 1389 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1390 Opt_errors_panic = GFS2_ERRORS_PANIC, 1391 }; 1392 1393 static const struct constant_table gfs2_param_errors[] = { 1394 {"withdraw", Opt_errors_withdraw }, 1395 {"panic", Opt_errors_panic }, 1396 {} 1397 }; 1398 1399 static const struct fs_parameter_spec gfs2_fs_parameters[] = { 1400 fsparam_string ("lockproto", Opt_lockproto), 1401 fsparam_string ("locktable", Opt_locktable), 1402 fsparam_string ("hostdata", Opt_hostdata), 1403 fsparam_flag ("spectator", Opt_spectator), 1404 fsparam_flag ("norecovery", Opt_spectator), 1405 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1406 fsparam_flag ("localflocks", Opt_localflocks), 1407 fsparam_flag ("localcaching", Opt_localcaching), 1408 fsparam_flag_no("debug", Opt_debug), 1409 fsparam_flag ("upgrade", Opt_upgrade), 1410 fsparam_flag_no("acl", Opt_acl), 1411 fsparam_flag_no("suiddir", Opt_suiddir), 1412 fsparam_enum ("data", Opt_data, gfs2_param_data), 1413 fsparam_flag ("meta", Opt_meta), 1414 fsparam_flag_no("discard", Opt_discard), 1415 fsparam_s32 ("commit", Opt_commit), 1416 fsparam_enum ("errors", Opt_errors, gfs2_param_errors), 1417 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1418 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1419 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1420 fsparam_flag_no("barrier", Opt_barrier), 1421 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1422 fsparam_flag_no("loccookie", Opt_loccookie), 1423 /* quota can be a flag or an enum so it gets special treatment */ 1424 fsparam_flag_no("quota", Opt_quota_flag), 1425 fsparam_enum("quota", Opt_quota, gfs2_param_quota), 1426 {} 1427 }; 1428 1429 /* Parse a single mount parameter */ 1430 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1431 { 1432 struct gfs2_args *args = fc->fs_private; 1433 struct fs_parse_result result; 1434 int o; 1435 1436 o = fs_parse(fc, gfs2_fs_parameters, param, &result); 1437 if (o < 0) 1438 return o; 1439 1440 switch (o) { 1441 case Opt_lockproto: 1442 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1443 break; 1444 case Opt_locktable: 1445 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1446 break; 1447 case Opt_hostdata: 1448 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1449 break; 1450 case Opt_spectator: 1451 args->ar_spectator = 1; 1452 break; 1453 case Opt_ignore_local_fs: 1454 /* Retained for backwards compat only */ 1455 break; 1456 case Opt_localflocks: 1457 args->ar_localflocks = 1; 1458 break; 1459 case Opt_localcaching: 1460 /* Retained for backwards compat only */ 1461 break; 1462 case Opt_debug: 1463 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1464 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1465 args->ar_debug = result.boolean; 1466 break; 1467 case Opt_upgrade: 1468 /* Retained for backwards compat only */ 1469 break; 1470 case Opt_acl: 1471 args->ar_posix_acl = result.boolean; 1472 break; 1473 case Opt_quota_flag: 1474 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; 1475 break; 1476 case Opt_quota: 1477 args->ar_quota = result.int_32; 1478 break; 1479 case Opt_suiddir: 1480 args->ar_suiddir = result.boolean; 1481 break; 1482 case Opt_data: 1483 /* The uint_32 result maps directly to GFS2_DATA_* */ 1484 args->ar_data = result.uint_32; 1485 break; 1486 case Opt_meta: 1487 args->ar_meta = 1; 1488 break; 1489 case Opt_discard: 1490 args->ar_discard = result.boolean; 1491 break; 1492 case Opt_commit: 1493 if (result.int_32 <= 0) 1494 return invalfc(fc, "commit mount option requires a positive numeric argument"); 1495 args->ar_commit = result.int_32; 1496 break; 1497 case Opt_statfs_quantum: 1498 if (result.int_32 < 0) 1499 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); 1500 args->ar_statfs_quantum = result.int_32; 1501 break; 1502 case Opt_quota_quantum: 1503 if (result.int_32 <= 0) 1504 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); 1505 args->ar_quota_quantum = result.int_32; 1506 break; 1507 case Opt_statfs_percent: 1508 if (result.int_32 < 0 || result.int_32 > 100) 1509 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); 1510 args->ar_statfs_percent = result.int_32; 1511 break; 1512 case Opt_errors: 1513 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1514 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1515 args->ar_errors = result.uint_32; 1516 break; 1517 case Opt_barrier: 1518 args->ar_nobarrier = result.boolean; 1519 break; 1520 case Opt_rgrplvb: 1521 args->ar_rgrplvb = result.boolean; 1522 args->ar_got_rgrplvb = 1; 1523 break; 1524 case Opt_loccookie: 1525 args->ar_loccookie = result.boolean; 1526 break; 1527 default: 1528 return invalfc(fc, "invalid mount option: %s", param->key); 1529 } 1530 return 0; 1531 } 1532 1533 static int gfs2_reconfigure(struct fs_context *fc) 1534 { 1535 struct super_block *sb = fc->root->d_sb; 1536 struct gfs2_sbd *sdp = sb->s_fs_info; 1537 struct gfs2_args *oldargs = &sdp->sd_args; 1538 struct gfs2_args *newargs = fc->fs_private; 1539 struct gfs2_tune *gt = &sdp->sd_tune; 1540 int error = 0; 1541 1542 sync_filesystem(sb); 1543 1544 spin_lock(>->gt_spin); 1545 oldargs->ar_commit = gt->gt_logd_secs; 1546 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1547 if (gt->gt_statfs_slow) 1548 oldargs->ar_statfs_quantum = 0; 1549 else 1550 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1551 spin_unlock(>->gt_spin); 1552 1553 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1554 errorfc(fc, "reconfiguration of locking protocol not allowed"); 1555 return -EINVAL; 1556 } 1557 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1558 errorfc(fc, "reconfiguration of lock table not allowed"); 1559 return -EINVAL; 1560 } 1561 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1562 errorfc(fc, "reconfiguration of host data not allowed"); 1563 return -EINVAL; 1564 } 1565 if (newargs->ar_spectator != oldargs->ar_spectator) { 1566 errorfc(fc, "reconfiguration of spectator mode not allowed"); 1567 return -EINVAL; 1568 } 1569 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1570 errorfc(fc, "reconfiguration of localflocks not allowed"); 1571 return -EINVAL; 1572 } 1573 if (newargs->ar_meta != oldargs->ar_meta) { 1574 errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); 1575 return -EINVAL; 1576 } 1577 if (oldargs->ar_spectator) 1578 fc->sb_flags |= SB_RDONLY; 1579 1580 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1581 struct gfs2_holder freeze_gh; 1582 1583 error = gfs2_freeze_lock(sdp, &freeze_gh, 0); 1584 if (error) 1585 return -EINVAL; 1586 1587 if (fc->sb_flags & SB_RDONLY) { 1588 gfs2_make_fs_ro(sdp); 1589 } else { 1590 error = gfs2_make_fs_rw(sdp); 1591 if (error) 1592 errorfc(fc, "unable to remount read-write"); 1593 } 1594 gfs2_freeze_unlock(&freeze_gh); 1595 } 1596 sdp->sd_args = *newargs; 1597 1598 if (sdp->sd_args.ar_posix_acl) 1599 sb->s_flags |= SB_POSIXACL; 1600 else 1601 sb->s_flags &= ~SB_POSIXACL; 1602 if (sdp->sd_args.ar_nobarrier) 1603 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1604 else 1605 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1606 spin_lock(>->gt_spin); 1607 gt->gt_logd_secs = newargs->ar_commit; 1608 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1609 if (newargs->ar_statfs_quantum) { 1610 gt->gt_statfs_slow = 0; 1611 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1612 } 1613 else { 1614 gt->gt_statfs_slow = 1; 1615 gt->gt_statfs_quantum = 30; 1616 } 1617 spin_unlock(>->gt_spin); 1618 1619 gfs2_online_uevent(sdp); 1620 return error; 1621 } 1622 1623 static const struct fs_context_operations gfs2_context_ops = { 1624 .free = gfs2_fc_free, 1625 .parse_param = gfs2_parse_param, 1626 .get_tree = gfs2_get_tree, 1627 .reconfigure = gfs2_reconfigure, 1628 }; 1629 1630 /* Set up the filesystem mount context */ 1631 static int gfs2_init_fs_context(struct fs_context *fc) 1632 { 1633 struct gfs2_args *args; 1634 1635 args = kmalloc(sizeof(*args), GFP_KERNEL); 1636 if (args == NULL) 1637 return -ENOMEM; 1638 1639 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1640 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1641 1642 *args = sdp->sd_args; 1643 } else { 1644 memset(args, 0, sizeof(*args)); 1645 args->ar_quota = GFS2_QUOTA_DEFAULT; 1646 args->ar_data = GFS2_DATA_DEFAULT; 1647 args->ar_commit = 30; 1648 args->ar_statfs_quantum = 30; 1649 args->ar_quota_quantum = 60; 1650 args->ar_errors = GFS2_ERRORS_DEFAULT; 1651 } 1652 fc->fs_private = args; 1653 fc->ops = &gfs2_context_ops; 1654 return 0; 1655 } 1656 1657 static int set_meta_super(struct super_block *s, struct fs_context *fc) 1658 { 1659 return -EINVAL; 1660 } 1661 1662 static int test_meta_super(struct super_block *s, struct fs_context *fc) 1663 { 1664 return (fc->sget_key == s->s_bdev); 1665 } 1666 1667 static int gfs2_meta_get_tree(struct fs_context *fc) 1668 { 1669 struct super_block *s; 1670 struct gfs2_sbd *sdp; 1671 struct path path; 1672 int error; 1673 1674 if (!fc->source || !*fc->source) 1675 return -EINVAL; 1676 1677 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1678 if (error) { 1679 pr_warn("path_lookup on %s returned error %d\n", 1680 fc->source, error); 1681 return error; 1682 } 1683 fc->fs_type = &gfs2_fs_type; 1684 fc->sget_key = path.dentry->d_sb->s_bdev; 1685 s = sget_fc(fc, test_meta_super, set_meta_super); 1686 path_put(&path); 1687 if (IS_ERR(s)) { 1688 pr_warn("gfs2 mount does not exist\n"); 1689 return PTR_ERR(s); 1690 } 1691 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1692 deactivate_locked_super(s); 1693 return -EBUSY; 1694 } 1695 sdp = s->s_fs_info; 1696 fc->root = dget(sdp->sd_master_dir); 1697 return 0; 1698 } 1699 1700 static const struct fs_context_operations gfs2_meta_context_ops = { 1701 .free = gfs2_fc_free, 1702 .get_tree = gfs2_meta_get_tree, 1703 }; 1704 1705 static int gfs2_meta_init_fs_context(struct fs_context *fc) 1706 { 1707 int ret = gfs2_init_fs_context(fc); 1708 1709 if (ret) 1710 return ret; 1711 1712 fc->ops = &gfs2_meta_context_ops; 1713 return 0; 1714 } 1715 1716 static void gfs2_kill_sb(struct super_block *sb) 1717 { 1718 struct gfs2_sbd *sdp = sb->s_fs_info; 1719 1720 if (sdp == NULL) { 1721 kill_block_super(sb); 1722 return; 1723 } 1724 1725 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1726 dput(sdp->sd_root_dir); 1727 dput(sdp->sd_master_dir); 1728 sdp->sd_root_dir = NULL; 1729 sdp->sd_master_dir = NULL; 1730 shrink_dcache_sb(sb); 1731 kill_block_super(sb); 1732 } 1733 1734 struct file_system_type gfs2_fs_type = { 1735 .name = "gfs2", 1736 .fs_flags = FS_REQUIRES_DEV, 1737 .init_fs_context = gfs2_init_fs_context, 1738 .parameters = gfs2_fs_parameters, 1739 .kill_sb = gfs2_kill_sb, 1740 .owner = THIS_MODULE, 1741 }; 1742 MODULE_ALIAS_FS("gfs2"); 1743 1744 struct file_system_type gfs2meta_fs_type = { 1745 .name = "gfs2meta", 1746 .fs_flags = FS_REQUIRES_DEV, 1747 .init_fs_context = gfs2_meta_init_fs_context, 1748 .owner = THIS_MODULE, 1749 }; 1750 MODULE_ALIAS_FS("gfs2meta"); 1751