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 INIT_LIST_HEAD(&sdp->sd_trunc_list); 110 spin_lock_init(&sdp->sd_trunc_lock); 111 spin_lock_init(&sdp->sd_bitmap_lock); 112 113 INIT_LIST_HEAD(&sdp->sd_sc_inodes_list); 114 115 mapping = &sdp->sd_aspace; 116 117 address_space_init_once(mapping); 118 mapping->a_ops = &gfs2_rgrp_aops; 119 mapping->host = sb->s_bdev->bd_inode; 120 mapping->flags = 0; 121 mapping_set_gfp_mask(mapping, GFP_NOFS); 122 mapping->private_data = NULL; 123 mapping->writeback_index = 0; 124 125 spin_lock_init(&sdp->sd_log_lock); 126 atomic_set(&sdp->sd_log_pinned, 0); 127 INIT_LIST_HEAD(&sdp->sd_log_revokes); 128 INIT_LIST_HEAD(&sdp->sd_log_ordered); 129 spin_lock_init(&sdp->sd_ordered_lock); 130 131 init_waitqueue_head(&sdp->sd_log_waitq); 132 init_waitqueue_head(&sdp->sd_logd_waitq); 133 spin_lock_init(&sdp->sd_ail_lock); 134 INIT_LIST_HEAD(&sdp->sd_ail1_list); 135 INIT_LIST_HEAD(&sdp->sd_ail2_list); 136 137 init_rwsem(&sdp->sd_log_flush_lock); 138 atomic_set(&sdp->sd_log_in_flight, 0); 139 init_waitqueue_head(&sdp->sd_log_flush_wait); 140 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 141 mutex_init(&sdp->sd_freeze_mutex); 142 143 return sdp; 144 145 fail: 146 free_sbd(sdp); 147 return NULL; 148 } 149 150 /** 151 * gfs2_check_sb - Check superblock 152 * @sdp: the filesystem 153 * @silent: Don't print a message if the check fails 154 * 155 * Checks the version code of the FS is one that we understand how to 156 * read and that the sizes of the various on-disk structures have not 157 * changed. 158 */ 159 160 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 161 { 162 struct gfs2_sb_host *sb = &sdp->sd_sb; 163 164 if (sb->sb_magic != GFS2_MAGIC || 165 sb->sb_type != GFS2_METATYPE_SB) { 166 if (!silent) 167 pr_warn("not a GFS2 filesystem\n"); 168 return -EINVAL; 169 } 170 171 if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN || 172 sb->sb_fs_format > GFS2_FS_FORMAT_MAX || 173 sb->sb_multihost_format != GFS2_FORMAT_MULTI) { 174 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 175 return -EINVAL; 176 } 177 178 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE || 179 (sb->sb_bsize & (sb->sb_bsize - 1))) { 180 pr_warn("Invalid block size\n"); 181 return -EINVAL; 182 } 183 184 return 0; 185 } 186 187 static void end_bio_io_page(struct bio *bio) 188 { 189 struct page *page = bio->bi_private; 190 191 if (!bio->bi_status) 192 SetPageUptodate(page); 193 else 194 pr_warn("error %d reading superblock\n", bio->bi_status); 195 unlock_page(page); 196 } 197 198 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 199 { 200 struct gfs2_sb_host *sb = &sdp->sd_sb; 201 struct super_block *s = sdp->sd_vfs; 202 const struct gfs2_sb *str = buf; 203 204 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 205 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 206 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 207 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 208 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 209 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 210 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 211 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 212 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 213 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 214 215 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 216 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 217 memcpy(&s->s_uuid, str->sb_uuid, 16); 218 } 219 220 /** 221 * gfs2_read_super - Read the gfs2 super block from disk 222 * @sdp: The GFS2 super block 223 * @sector: The location of the super block 224 * @silent: Don't print a message if the check fails 225 * 226 * This uses the bio functions to read the super block from disk 227 * because we want to be 100% sure that we never read cached data. 228 * A super block is read twice only during each GFS2 mount and is 229 * never written to by the filesystem. The first time its read no 230 * locks are held, and the only details which are looked at are those 231 * relating to the locking protocol. Once locking is up and working, 232 * the sb is read again under the lock to establish the location of 233 * the master directory (contains pointers to journals etc) and the 234 * root directory. 235 * 236 * Returns: 0 on success or error 237 */ 238 239 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 240 { 241 struct super_block *sb = sdp->sd_vfs; 242 struct gfs2_sb *p; 243 struct page *page; 244 struct bio *bio; 245 246 page = alloc_page(GFP_NOFS); 247 if (unlikely(!page)) 248 return -ENOMEM; 249 250 ClearPageUptodate(page); 251 ClearPageDirty(page); 252 lock_page(page); 253 254 bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS); 255 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 256 bio_add_page(bio, page, PAGE_SIZE, 0); 257 258 bio->bi_end_io = end_bio_io_page; 259 bio->bi_private = page; 260 submit_bio(bio); 261 wait_on_page_locked(page); 262 bio_put(bio); 263 if (!PageUptodate(page)) { 264 __free_page(page); 265 return -EIO; 266 } 267 p = kmap(page); 268 gfs2_sb_in(sdp, p); 269 kunmap(page); 270 __free_page(page); 271 return gfs2_check_sb(sdp, silent); 272 } 273 274 /** 275 * gfs2_read_sb - Read super block 276 * @sdp: The GFS2 superblock 277 * @silent: Don't print message if mount fails 278 * 279 */ 280 281 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 282 { 283 u32 hash_blocks, ind_blocks, leaf_blocks; 284 u32 tmp_blocks; 285 unsigned int x; 286 int error; 287 288 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 289 if (error) { 290 if (!silent) 291 fs_err(sdp, "can't read superblock\n"); 292 return error; 293 } 294 295 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 296 GFS2_BASIC_BLOCK_SHIFT; 297 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 298 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 299 sizeof(struct gfs2_dinode)) / sizeof(u64); 300 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 301 sizeof(struct gfs2_meta_header)) / sizeof(u64); 302 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize - 303 sizeof(struct gfs2_log_descriptor)) / sizeof(u64); 304 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 305 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 306 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 307 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 308 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 309 sizeof(struct gfs2_meta_header)) / 310 sizeof(struct gfs2_quota_change); 311 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 312 sizeof(struct gfs2_meta_header)) 313 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 314 315 /* 316 * We always keep at least one block reserved for revokes in 317 * transactions. This greatly simplifies allocating additional 318 * revoke blocks. 319 */ 320 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs); 321 322 /* Compute maximum reservation required to add a entry to a directory */ 323 324 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 325 sdp->sd_jbsize); 326 327 ind_blocks = 0; 328 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 329 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 330 ind_blocks += tmp_blocks; 331 } 332 333 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 334 335 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 336 337 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 338 sizeof(struct gfs2_dinode); 339 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 340 for (x = 2;; x++) { 341 u64 space, d; 342 u32 m; 343 344 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 345 d = space; 346 m = do_div(d, sdp->sd_inptrs); 347 348 if (d != sdp->sd_heightsize[x - 1] || m) 349 break; 350 sdp->sd_heightsize[x] = space; 351 } 352 sdp->sd_max_height = x; 353 sdp->sd_heightsize[x] = ~0; 354 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 355 356 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 357 sizeof(struct gfs2_leaf)) / 358 GFS2_MIN_DIRENT_SIZE; 359 return 0; 360 } 361 362 static int init_names(struct gfs2_sbd *sdp, int silent) 363 { 364 char *proto, *table; 365 int error = 0; 366 367 proto = sdp->sd_args.ar_lockproto; 368 table = sdp->sd_args.ar_locktable; 369 370 /* Try to autodetect */ 371 372 if (!proto[0] || !table[0]) { 373 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 374 if (error) 375 return error; 376 377 if (!proto[0]) 378 proto = sdp->sd_sb.sb_lockproto; 379 if (!table[0]) 380 table = sdp->sd_sb.sb_locktable; 381 } 382 383 if (!table[0]) 384 table = sdp->sd_vfs->s_id; 385 386 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 387 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 388 389 table = sdp->sd_table_name; 390 while ((table = strchr(table, '/'))) 391 *table = '_'; 392 393 return error; 394 } 395 396 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 397 int undo) 398 { 399 int error = 0; 400 401 if (undo) 402 goto fail_trans; 403 404 error = gfs2_glock_nq_num(sdp, 405 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 406 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 407 mount_gh); 408 if (error) { 409 fs_err(sdp, "can't acquire mount glock: %d\n", error); 410 goto fail; 411 } 412 413 error = gfs2_glock_nq_num(sdp, 414 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 415 LM_ST_SHARED, 416 LM_FLAG_NOEXP | GL_EXACT, 417 &sdp->sd_live_gh); 418 if (error) { 419 fs_err(sdp, "can't acquire live glock: %d\n", error); 420 goto fail_mount; 421 } 422 423 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 424 CREATE, &sdp->sd_rename_gl); 425 if (error) { 426 fs_err(sdp, "can't create rename glock: %d\n", error); 427 goto fail_live; 428 } 429 430 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 431 CREATE, &sdp->sd_freeze_gl); 432 if (error) { 433 fs_err(sdp, "can't create transaction glock: %d\n", error); 434 goto fail_rename; 435 } 436 437 return 0; 438 439 fail_trans: 440 gfs2_glock_put(sdp->sd_freeze_gl); 441 fail_rename: 442 gfs2_glock_put(sdp->sd_rename_gl); 443 fail_live: 444 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 445 fail_mount: 446 gfs2_glock_dq_uninit(mount_gh); 447 fail: 448 return error; 449 } 450 451 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 452 u64 no_addr, const char *name) 453 { 454 struct gfs2_sbd *sdp = sb->s_fs_info; 455 struct dentry *dentry; 456 struct inode *inode; 457 458 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 459 GFS2_BLKST_FREE /* ignore */); 460 if (IS_ERR(inode)) { 461 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 462 return PTR_ERR(inode); 463 } 464 dentry = d_make_root(inode); 465 if (!dentry) { 466 fs_err(sdp, "can't alloc %s dentry\n", name); 467 return -ENOMEM; 468 } 469 *dptr = dentry; 470 return 0; 471 } 472 473 static int init_sb(struct gfs2_sbd *sdp, int silent) 474 { 475 struct super_block *sb = sdp->sd_vfs; 476 struct gfs2_holder sb_gh; 477 u64 no_addr; 478 int ret; 479 480 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 481 LM_ST_SHARED, 0, &sb_gh); 482 if (ret) { 483 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 484 return ret; 485 } 486 487 ret = gfs2_read_sb(sdp, silent); 488 if (ret) { 489 fs_err(sdp, "can't read superblock: %d\n", ret); 490 goto out; 491 } 492 493 switch(sdp->sd_sb.sb_fs_format) { 494 case GFS2_FS_FORMAT_MAX: 495 sb->s_xattr = gfs2_xattr_handlers_max; 496 break; 497 498 case GFS2_FS_FORMAT_MIN: 499 sb->s_xattr = gfs2_xattr_handlers_min; 500 break; 501 502 default: 503 BUG(); 504 } 505 506 /* Set up the buffer cache and SB for real */ 507 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 508 ret = -EINVAL; 509 fs_err(sdp, "FS block size (%u) is too small for device " 510 "block size (%u)\n", 511 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 512 goto out; 513 } 514 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 515 ret = -EINVAL; 516 fs_err(sdp, "FS block size (%u) is too big for machine " 517 "page size (%u)\n", 518 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 519 goto out; 520 } 521 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 522 523 /* Get the root inode */ 524 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 525 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 526 if (ret) 527 goto out; 528 529 /* Get the master inode */ 530 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 531 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 532 if (ret) { 533 dput(sdp->sd_root_dir); 534 goto out; 535 } 536 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 537 out: 538 gfs2_glock_dq_uninit(&sb_gh); 539 return ret; 540 } 541 542 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 543 { 544 char *message = "FIRSTMOUNT=Done"; 545 char *envp[] = { message, NULL }; 546 547 fs_info(sdp, "first mount done, others may mount\n"); 548 549 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 550 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 551 552 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 553 } 554 555 /** 556 * gfs2_jindex_hold - Grab a lock on the jindex 557 * @sdp: The GFS2 superblock 558 * @ji_gh: the holder for the jindex glock 559 * 560 * Returns: errno 561 */ 562 563 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 564 { 565 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 566 struct qstr name; 567 char buf[20]; 568 struct gfs2_jdesc *jd; 569 int error; 570 571 name.name = buf; 572 573 mutex_lock(&sdp->sd_jindex_mutex); 574 575 for (;;) { 576 struct gfs2_inode *jip; 577 578 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 579 if (error) 580 break; 581 582 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 583 name.hash = gfs2_disk_hash(name.name, name.len); 584 585 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 586 if (error == -ENOENT) { 587 error = 0; 588 break; 589 } 590 591 gfs2_glock_dq_uninit(ji_gh); 592 593 if (error) 594 break; 595 596 error = -ENOMEM; 597 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 598 if (!jd) 599 break; 600 601 INIT_LIST_HEAD(&jd->extent_list); 602 INIT_LIST_HEAD(&jd->jd_revoke_list); 603 604 INIT_WORK(&jd->jd_work, gfs2_recover_func); 605 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 606 if (IS_ERR_OR_NULL(jd->jd_inode)) { 607 if (!jd->jd_inode) 608 error = -ENOENT; 609 else 610 error = PTR_ERR(jd->jd_inode); 611 kfree(jd); 612 break; 613 } 614 615 d_mark_dontcache(jd->jd_inode); 616 spin_lock(&sdp->sd_jindex_spin); 617 jd->jd_jid = sdp->sd_journals++; 618 jip = GFS2_I(jd->jd_inode); 619 jd->jd_no_addr = jip->i_no_addr; 620 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 621 spin_unlock(&sdp->sd_jindex_spin); 622 } 623 624 mutex_unlock(&sdp->sd_jindex_mutex); 625 626 return error; 627 } 628 629 /** 630 * init_statfs - look up and initialize master and local (per node) statfs inodes 631 * @sdp: The GFS2 superblock 632 * 633 * This should be called after the jindex is initialized in init_journal() and 634 * before gfs2_journal_recovery() is called because we need to be able to write 635 * to these inodes during recovery. 636 * 637 * Returns: errno 638 */ 639 static int init_statfs(struct gfs2_sbd *sdp) 640 { 641 int error = 0; 642 struct inode *master = d_inode(sdp->sd_master_dir); 643 struct inode *pn = NULL; 644 char buf[30]; 645 struct gfs2_jdesc *jd; 646 struct gfs2_inode *ip; 647 648 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 649 if (IS_ERR(sdp->sd_statfs_inode)) { 650 error = PTR_ERR(sdp->sd_statfs_inode); 651 fs_err(sdp, "can't read in statfs inode: %d\n", error); 652 goto out; 653 } 654 if (sdp->sd_args.ar_spectator) 655 goto out; 656 657 pn = gfs2_lookup_simple(master, "per_node"); 658 if (IS_ERR(pn)) { 659 error = PTR_ERR(pn); 660 fs_err(sdp, "can't find per_node directory: %d\n", error); 661 goto put_statfs; 662 } 663 664 /* For each jid, lookup the corresponding local statfs inode in the 665 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */ 666 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 667 struct local_statfs_inode *lsi = 668 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS); 669 if (!lsi) { 670 error = -ENOMEM; 671 goto free_local; 672 } 673 sprintf(buf, "statfs_change%u", jd->jd_jid); 674 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf); 675 if (IS_ERR(lsi->si_sc_inode)) { 676 error = PTR_ERR(lsi->si_sc_inode); 677 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n", 678 jd->jd_jid, error); 679 kfree(lsi); 680 goto free_local; 681 } 682 lsi->si_jid = jd->jd_jid; 683 if (jd->jd_jid == sdp->sd_jdesc->jd_jid) 684 sdp->sd_sc_inode = lsi->si_sc_inode; 685 686 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list); 687 } 688 689 iput(pn); 690 pn = NULL; 691 ip = GFS2_I(sdp->sd_sc_inode); 692 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 693 &sdp->sd_sc_gh); 694 if (error) { 695 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 696 goto free_local; 697 } 698 /* read in the local statfs buffer - other nodes don't change it. */ 699 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh); 700 if (error) { 701 fs_err(sdp, "Cannot read in local statfs: %d\n", error); 702 goto unlock_sd_gh; 703 } 704 return 0; 705 706 unlock_sd_gh: 707 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 708 free_local: 709 free_local_statfs_inodes(sdp); 710 iput(pn); 711 put_statfs: 712 iput(sdp->sd_statfs_inode); 713 out: 714 return error; 715 } 716 717 /* Uninitialize and free up memory used by the list of statfs inodes */ 718 static void uninit_statfs(struct gfs2_sbd *sdp) 719 { 720 if (!sdp->sd_args.ar_spectator) { 721 brelse(sdp->sd_sc_bh); 722 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 723 free_local_statfs_inodes(sdp); 724 } 725 iput(sdp->sd_statfs_inode); 726 } 727 728 static int init_journal(struct gfs2_sbd *sdp, int undo) 729 { 730 struct inode *master = d_inode(sdp->sd_master_dir); 731 struct gfs2_holder ji_gh; 732 struct gfs2_inode *ip; 733 int jindex = 1; 734 int error = 0; 735 736 if (undo) { 737 jindex = 0; 738 goto fail_statfs; 739 } 740 741 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 742 if (IS_ERR(sdp->sd_jindex)) { 743 fs_err(sdp, "can't lookup journal index: %d\n", error); 744 return PTR_ERR(sdp->sd_jindex); 745 } 746 747 /* Load in the journal index special file */ 748 749 error = gfs2_jindex_hold(sdp, &ji_gh); 750 if (error) { 751 fs_err(sdp, "can't read journal index: %d\n", error); 752 goto fail; 753 } 754 755 error = -EUSERS; 756 if (!gfs2_jindex_size(sdp)) { 757 fs_err(sdp, "no journals!\n"); 758 goto fail_jindex; 759 } 760 761 atomic_set(&sdp->sd_log_blks_needed, 0); 762 if (sdp->sd_args.ar_spectator) { 763 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 764 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 765 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 766 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 767 } else { 768 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 769 fs_err(sdp, "can't mount journal #%u\n", 770 sdp->sd_lockstruct.ls_jid); 771 fs_err(sdp, "there are only %u journals (0 - %u)\n", 772 gfs2_jindex_size(sdp), 773 gfs2_jindex_size(sdp) - 1); 774 goto fail_jindex; 775 } 776 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 777 778 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 779 &gfs2_journal_glops, 780 LM_ST_EXCLUSIVE, 781 LM_FLAG_NOEXP | GL_NOCACHE, 782 &sdp->sd_journal_gh); 783 if (error) { 784 fs_err(sdp, "can't acquire journal glock: %d\n", error); 785 goto fail_jindex; 786 } 787 788 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 789 sdp->sd_jinode_gl = ip->i_gl; 790 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 791 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 792 &sdp->sd_jinode_gh); 793 if (error) { 794 fs_err(sdp, "can't acquire journal inode glock: %d\n", 795 error); 796 goto fail_journal_gh; 797 } 798 799 error = gfs2_jdesc_check(sdp->sd_jdesc); 800 if (error) { 801 fs_err(sdp, "my journal (%u) is bad: %d\n", 802 sdp->sd_jdesc->jd_jid, error); 803 goto fail_jinode_gh; 804 } 805 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 806 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 807 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 808 809 /* Map the extents for this journal's blocks */ 810 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 811 } 812 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 813 814 /* Lookup statfs inodes here so journal recovery can use them. */ 815 error = init_statfs(sdp); 816 if (error) 817 goto fail_jinode_gh; 818 819 if (sdp->sd_lockstruct.ls_first) { 820 unsigned int x; 821 for (x = 0; x < sdp->sd_journals; x++) { 822 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 823 824 if (sdp->sd_args.ar_spectator) { 825 error = check_journal_clean(sdp, jd, true); 826 if (error) 827 goto fail_statfs; 828 continue; 829 } 830 error = gfs2_recover_journal(jd, true); 831 if (error) { 832 fs_err(sdp, "error recovering journal %u: %d\n", 833 x, error); 834 goto fail_statfs; 835 } 836 } 837 838 gfs2_others_may_mount(sdp); 839 } else if (!sdp->sd_args.ar_spectator) { 840 error = gfs2_recover_journal(sdp->sd_jdesc, true); 841 if (error) { 842 fs_err(sdp, "error recovering my journal: %d\n", error); 843 goto fail_statfs; 844 } 845 } 846 847 sdp->sd_log_idle = 1; 848 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 849 gfs2_glock_dq_uninit(&ji_gh); 850 jindex = 0; 851 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 852 return 0; 853 854 fail_statfs: 855 uninit_statfs(sdp); 856 fail_jinode_gh: 857 /* A withdraw may have done dq/uninit so now we need to check it */ 858 if (!sdp->sd_args.ar_spectator && 859 gfs2_holder_initialized(&sdp->sd_jinode_gh)) 860 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 861 fail_journal_gh: 862 if (!sdp->sd_args.ar_spectator && 863 gfs2_holder_initialized(&sdp->sd_journal_gh)) 864 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 865 fail_jindex: 866 gfs2_jindex_free(sdp); 867 if (jindex) 868 gfs2_glock_dq_uninit(&ji_gh); 869 fail: 870 iput(sdp->sd_jindex); 871 return error; 872 } 873 874 static struct lock_class_key gfs2_quota_imutex_key; 875 876 static int init_inodes(struct gfs2_sbd *sdp, int undo) 877 { 878 int error = 0; 879 struct inode *master = d_inode(sdp->sd_master_dir); 880 881 if (undo) 882 goto fail_qinode; 883 884 error = init_journal(sdp, undo); 885 complete_all(&sdp->sd_journal_ready); 886 if (error) 887 goto fail; 888 889 /* Read in the resource index inode */ 890 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 891 if (IS_ERR(sdp->sd_rindex)) { 892 error = PTR_ERR(sdp->sd_rindex); 893 fs_err(sdp, "can't get resource index inode: %d\n", error); 894 goto fail_journal; 895 } 896 sdp->sd_rindex_uptodate = 0; 897 898 /* Read in the quota inode */ 899 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 900 if (IS_ERR(sdp->sd_quota_inode)) { 901 error = PTR_ERR(sdp->sd_quota_inode); 902 fs_err(sdp, "can't get quota file inode: %d\n", error); 903 goto fail_rindex; 904 } 905 /* 906 * i_rwsem on quota files is special. Since this inode is hidden system 907 * file, we are safe to define locking ourselves. 908 */ 909 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 910 &gfs2_quota_imutex_key); 911 912 error = gfs2_rindex_update(sdp); 913 if (error) 914 goto fail_qinode; 915 916 return 0; 917 918 fail_qinode: 919 iput(sdp->sd_quota_inode); 920 fail_rindex: 921 gfs2_clear_rgrpd(sdp); 922 iput(sdp->sd_rindex); 923 fail_journal: 924 init_journal(sdp, UNDO); 925 fail: 926 return error; 927 } 928 929 static int init_per_node(struct gfs2_sbd *sdp, int undo) 930 { 931 struct inode *pn = NULL; 932 char buf[30]; 933 int error = 0; 934 struct gfs2_inode *ip; 935 struct inode *master = d_inode(sdp->sd_master_dir); 936 937 if (sdp->sd_args.ar_spectator) 938 return 0; 939 940 if (undo) 941 goto fail_qc_gh; 942 943 pn = gfs2_lookup_simple(master, "per_node"); 944 if (IS_ERR(pn)) { 945 error = PTR_ERR(pn); 946 fs_err(sdp, "can't find per_node directory: %d\n", error); 947 return error; 948 } 949 950 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 951 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 952 if (IS_ERR(sdp->sd_qc_inode)) { 953 error = PTR_ERR(sdp->sd_qc_inode); 954 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 955 goto fail_ut_i; 956 } 957 958 iput(pn); 959 pn = NULL; 960 961 ip = GFS2_I(sdp->sd_qc_inode); 962 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 963 &sdp->sd_qc_gh); 964 if (error) { 965 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 966 goto fail_qc_i; 967 } 968 969 return 0; 970 971 fail_qc_gh: 972 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 973 fail_qc_i: 974 iput(sdp->sd_qc_inode); 975 fail_ut_i: 976 iput(pn); 977 return error; 978 } 979 980 static const match_table_t nolock_tokens = { 981 { Opt_jid, "jid=%d", }, 982 { Opt_err, NULL }, 983 }; 984 985 static const struct lm_lockops nolock_ops = { 986 .lm_proto_name = "lock_nolock", 987 .lm_put_lock = gfs2_glock_free, 988 .lm_tokens = &nolock_tokens, 989 }; 990 991 /** 992 * gfs2_lm_mount - mount a locking protocol 993 * @sdp: the filesystem 994 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 995 * 996 * Returns: errno 997 */ 998 999 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 1000 { 1001 const struct lm_lockops *lm; 1002 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 1003 struct gfs2_args *args = &sdp->sd_args; 1004 const char *proto = sdp->sd_proto_name; 1005 const char *table = sdp->sd_table_name; 1006 char *o, *options; 1007 int ret; 1008 1009 if (!strcmp("lock_nolock", proto)) { 1010 lm = &nolock_ops; 1011 sdp->sd_args.ar_localflocks = 1; 1012 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 1013 } else if (!strcmp("lock_dlm", proto)) { 1014 lm = &gfs2_dlm_ops; 1015 #endif 1016 } else { 1017 pr_info("can't find protocol %s\n", proto); 1018 return -ENOENT; 1019 } 1020 1021 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 1022 1023 ls->ls_ops = lm; 1024 ls->ls_first = 1; 1025 1026 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 1027 substring_t tmp[MAX_OPT_ARGS]; 1028 int token, option; 1029 1030 if (!o || !*o) 1031 continue; 1032 1033 token = match_token(o, *lm->lm_tokens, tmp); 1034 switch (token) { 1035 case Opt_jid: 1036 ret = match_int(&tmp[0], &option); 1037 if (ret || option < 0) 1038 goto hostdata_error; 1039 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 1040 ls->ls_jid = option; 1041 break; 1042 case Opt_id: 1043 case Opt_nodir: 1044 /* Obsolete, but left for backward compat purposes */ 1045 break; 1046 case Opt_first: 1047 ret = match_int(&tmp[0], &option); 1048 if (ret || (option != 0 && option != 1)) 1049 goto hostdata_error; 1050 ls->ls_first = option; 1051 break; 1052 case Opt_err: 1053 default: 1054 hostdata_error: 1055 fs_info(sdp, "unknown hostdata (%s)\n", o); 1056 return -EINVAL; 1057 } 1058 } 1059 1060 if (lm->lm_mount == NULL) { 1061 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format); 1062 complete_all(&sdp->sd_locking_init); 1063 return 0; 1064 } 1065 ret = lm->lm_mount(sdp, table); 1066 if (ret == 0) 1067 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n", 1068 sdp->sd_sb.sb_fs_format); 1069 complete_all(&sdp->sd_locking_init); 1070 return ret; 1071 } 1072 1073 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1074 { 1075 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1076 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount) 1077 lm->lm_unmount(sdp); 1078 } 1079 1080 static int wait_on_journal(struct gfs2_sbd *sdp) 1081 { 1082 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1083 return 0; 1084 1085 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1086 ? -EINTR : 0; 1087 } 1088 1089 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1090 { 1091 struct super_block *sb = sdp->sd_vfs; 1092 char ro[20]; 1093 char spectator[20]; 1094 char *envp[] = { ro, spectator, NULL }; 1095 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1096 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1097 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1098 } 1099 1100 static int init_threads(struct gfs2_sbd *sdp) 1101 { 1102 struct task_struct *p; 1103 int error = 0; 1104 1105 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 1106 if (IS_ERR(p)) { 1107 error = PTR_ERR(p); 1108 fs_err(sdp, "can't start logd thread: %d\n", error); 1109 return error; 1110 } 1111 sdp->sd_logd_process = p; 1112 1113 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 1114 if (IS_ERR(p)) { 1115 error = PTR_ERR(p); 1116 fs_err(sdp, "can't start quotad thread: %d\n", error); 1117 goto fail; 1118 } 1119 sdp->sd_quotad_process = p; 1120 return 0; 1121 1122 fail: 1123 kthread_stop(sdp->sd_logd_process); 1124 sdp->sd_logd_process = NULL; 1125 return error; 1126 } 1127 1128 /** 1129 * gfs2_fill_super - Read in superblock 1130 * @sb: The VFS superblock 1131 * @fc: Mount options and flags 1132 * 1133 * Returns: -errno 1134 */ 1135 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1136 { 1137 struct gfs2_args *args = fc->fs_private; 1138 int silent = fc->sb_flags & SB_SILENT; 1139 struct gfs2_sbd *sdp; 1140 struct gfs2_holder mount_gh; 1141 struct gfs2_holder freeze_gh; 1142 int error; 1143 1144 sdp = init_sbd(sb); 1145 if (!sdp) { 1146 pr_warn("can't alloc struct gfs2_sbd\n"); 1147 return -ENOMEM; 1148 } 1149 sdp->sd_args = *args; 1150 1151 if (sdp->sd_args.ar_spectator) { 1152 sb->s_flags |= SB_RDONLY; 1153 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1154 } 1155 if (sdp->sd_args.ar_posix_acl) 1156 sb->s_flags |= SB_POSIXACL; 1157 if (sdp->sd_args.ar_nobarrier) 1158 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1159 1160 sb->s_flags |= SB_NOSEC; 1161 sb->s_magic = GFS2_MAGIC; 1162 sb->s_op = &gfs2_super_ops; 1163 sb->s_d_op = &gfs2_dops; 1164 sb->s_export_op = &gfs2_export_ops; 1165 sb->s_qcop = &gfs2_quotactl_ops; 1166 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1167 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1168 sb->s_time_gran = 1; 1169 sb->s_maxbytes = MAX_LFS_FILESIZE; 1170 1171 /* Set up the buffer cache and fill in some fake block size values 1172 to allow us to read-in the on-disk superblock. */ 1173 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1174 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1175 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1176 GFS2_BASIC_BLOCK_SHIFT; 1177 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1178 1179 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1180 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1181 if (sdp->sd_args.ar_statfs_quantum) { 1182 sdp->sd_tune.gt_statfs_slow = 0; 1183 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1184 } else { 1185 sdp->sd_tune.gt_statfs_slow = 1; 1186 sdp->sd_tune.gt_statfs_quantum = 30; 1187 } 1188 1189 error = init_names(sdp, silent); 1190 if (error) 1191 goto fail_free; 1192 1193 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1194 1195 error = gfs2_sys_fs_add(sdp); 1196 if (error) 1197 goto fail_free; 1198 1199 gfs2_create_debugfs_file(sdp); 1200 1201 error = gfs2_lm_mount(sdp, silent); 1202 if (error) 1203 goto fail_debug; 1204 1205 error = init_locking(sdp, &mount_gh, DO); 1206 if (error) 1207 goto fail_lm; 1208 1209 error = init_sb(sdp, silent); 1210 if (error) 1211 goto fail_locking; 1212 1213 /* Turn rgrplvb on by default if fs format is recent enough */ 1214 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801) 1215 sdp->sd_args.ar_rgrplvb = 1; 1216 1217 error = wait_on_journal(sdp); 1218 if (error) 1219 goto fail_sb; 1220 1221 /* 1222 * If user space has failed to join the cluster or some similar 1223 * failure has occurred, then the journal id will contain a 1224 * negative (error) number. This will then be returned to the 1225 * caller (of the mount syscall). We do this even for spectator 1226 * mounts (which just write a jid of 0 to indicate "ok" even though 1227 * the jid is unused in the spectator case) 1228 */ 1229 if (sdp->sd_lockstruct.ls_jid < 0) { 1230 error = sdp->sd_lockstruct.ls_jid; 1231 sdp->sd_lockstruct.ls_jid = 0; 1232 goto fail_sb; 1233 } 1234 1235 if (sdp->sd_args.ar_spectator) 1236 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1237 sdp->sd_table_name); 1238 else 1239 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1240 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1241 1242 error = init_inodes(sdp, DO); 1243 if (error) 1244 goto fail_sb; 1245 1246 error = init_per_node(sdp, DO); 1247 if (error) 1248 goto fail_inodes; 1249 1250 error = gfs2_statfs_init(sdp); 1251 if (error) { 1252 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1253 goto fail_per_node; 1254 } 1255 1256 if (!sb_rdonly(sb)) { 1257 error = init_threads(sdp); 1258 if (error) { 1259 gfs2_withdraw_delayed(sdp); 1260 goto fail_per_node; 1261 } 1262 } 1263 1264 error = gfs2_freeze_lock(sdp, &freeze_gh, 0); 1265 if (error) 1266 goto fail_per_node; 1267 1268 if (!sb_rdonly(sb)) 1269 error = gfs2_make_fs_rw(sdp); 1270 1271 gfs2_freeze_unlock(&freeze_gh); 1272 if (error) { 1273 if (sdp->sd_quotad_process) 1274 kthread_stop(sdp->sd_quotad_process); 1275 sdp->sd_quotad_process = NULL; 1276 if (sdp->sd_logd_process) 1277 kthread_stop(sdp->sd_logd_process); 1278 sdp->sd_logd_process = NULL; 1279 fs_err(sdp, "can't make FS RW: %d\n", error); 1280 goto fail_per_node; 1281 } 1282 gfs2_glock_dq_uninit(&mount_gh); 1283 gfs2_online_uevent(sdp); 1284 return 0; 1285 1286 fail_per_node: 1287 init_per_node(sdp, UNDO); 1288 fail_inodes: 1289 init_inodes(sdp, UNDO); 1290 fail_sb: 1291 if (sdp->sd_root_dir) 1292 dput(sdp->sd_root_dir); 1293 if (sdp->sd_master_dir) 1294 dput(sdp->sd_master_dir); 1295 if (sb->s_root) 1296 dput(sb->s_root); 1297 sb->s_root = NULL; 1298 fail_locking: 1299 init_locking(sdp, &mount_gh, UNDO); 1300 fail_lm: 1301 complete_all(&sdp->sd_journal_ready); 1302 gfs2_gl_hash_clear(sdp); 1303 gfs2_lm_unmount(sdp); 1304 fail_debug: 1305 gfs2_delete_debugfs_file(sdp); 1306 gfs2_sys_fs_del(sdp); 1307 fail_free: 1308 free_sbd(sdp); 1309 sb->s_fs_info = NULL; 1310 return error; 1311 } 1312 1313 /** 1314 * gfs2_get_tree - Get the GFS2 superblock and root directory 1315 * @fc: The filesystem context 1316 * 1317 * Returns: 0 or -errno on error 1318 */ 1319 static int gfs2_get_tree(struct fs_context *fc) 1320 { 1321 struct gfs2_args *args = fc->fs_private; 1322 struct gfs2_sbd *sdp; 1323 int error; 1324 1325 error = get_tree_bdev(fc, gfs2_fill_super); 1326 if (error) 1327 return error; 1328 1329 sdp = fc->root->d_sb->s_fs_info; 1330 dput(fc->root); 1331 if (args->ar_meta) 1332 fc->root = dget(sdp->sd_master_dir); 1333 else 1334 fc->root = dget(sdp->sd_root_dir); 1335 return 0; 1336 } 1337 1338 static void gfs2_fc_free(struct fs_context *fc) 1339 { 1340 struct gfs2_args *args = fc->fs_private; 1341 1342 kfree(args); 1343 } 1344 1345 enum gfs2_param { 1346 Opt_lockproto, 1347 Opt_locktable, 1348 Opt_hostdata, 1349 Opt_spectator, 1350 Opt_ignore_local_fs, 1351 Opt_localflocks, 1352 Opt_localcaching, 1353 Opt_debug, 1354 Opt_upgrade, 1355 Opt_acl, 1356 Opt_quota, 1357 Opt_quota_flag, 1358 Opt_suiddir, 1359 Opt_data, 1360 Opt_meta, 1361 Opt_discard, 1362 Opt_commit, 1363 Opt_errors, 1364 Opt_statfs_quantum, 1365 Opt_statfs_percent, 1366 Opt_quota_quantum, 1367 Opt_barrier, 1368 Opt_rgrplvb, 1369 Opt_loccookie, 1370 }; 1371 1372 static const struct constant_table gfs2_param_quota[] = { 1373 {"off", GFS2_QUOTA_OFF}, 1374 {"account", GFS2_QUOTA_ACCOUNT}, 1375 {"on", GFS2_QUOTA_ON}, 1376 {} 1377 }; 1378 1379 enum opt_data { 1380 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1381 Opt_data_ordered = GFS2_DATA_ORDERED, 1382 }; 1383 1384 static const struct constant_table gfs2_param_data[] = { 1385 {"writeback", Opt_data_writeback }, 1386 {"ordered", Opt_data_ordered }, 1387 {} 1388 }; 1389 1390 enum opt_errors { 1391 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1392 Opt_errors_panic = GFS2_ERRORS_PANIC, 1393 }; 1394 1395 static const struct constant_table gfs2_param_errors[] = { 1396 {"withdraw", Opt_errors_withdraw }, 1397 {"panic", Opt_errors_panic }, 1398 {} 1399 }; 1400 1401 static const struct fs_parameter_spec gfs2_fs_parameters[] = { 1402 fsparam_string ("lockproto", Opt_lockproto), 1403 fsparam_string ("locktable", Opt_locktable), 1404 fsparam_string ("hostdata", Opt_hostdata), 1405 fsparam_flag ("spectator", Opt_spectator), 1406 fsparam_flag ("norecovery", Opt_spectator), 1407 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1408 fsparam_flag ("localflocks", Opt_localflocks), 1409 fsparam_flag ("localcaching", Opt_localcaching), 1410 fsparam_flag_no("debug", Opt_debug), 1411 fsparam_flag ("upgrade", Opt_upgrade), 1412 fsparam_flag_no("acl", Opt_acl), 1413 fsparam_flag_no("suiddir", Opt_suiddir), 1414 fsparam_enum ("data", Opt_data, gfs2_param_data), 1415 fsparam_flag ("meta", Opt_meta), 1416 fsparam_flag_no("discard", Opt_discard), 1417 fsparam_s32 ("commit", Opt_commit), 1418 fsparam_enum ("errors", Opt_errors, gfs2_param_errors), 1419 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1420 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1421 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1422 fsparam_flag_no("barrier", Opt_barrier), 1423 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1424 fsparam_flag_no("loccookie", Opt_loccookie), 1425 /* quota can be a flag or an enum so it gets special treatment */ 1426 fsparam_flag_no("quota", Opt_quota_flag), 1427 fsparam_enum("quota", Opt_quota, gfs2_param_quota), 1428 {} 1429 }; 1430 1431 /* Parse a single mount parameter */ 1432 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1433 { 1434 struct gfs2_args *args = fc->fs_private; 1435 struct fs_parse_result result; 1436 int o; 1437 1438 o = fs_parse(fc, gfs2_fs_parameters, param, &result); 1439 if (o < 0) 1440 return o; 1441 1442 switch (o) { 1443 case Opt_lockproto: 1444 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1445 break; 1446 case Opt_locktable: 1447 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1448 break; 1449 case Opt_hostdata: 1450 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1451 break; 1452 case Opt_spectator: 1453 args->ar_spectator = 1; 1454 break; 1455 case Opt_ignore_local_fs: 1456 /* Retained for backwards compat only */ 1457 break; 1458 case Opt_localflocks: 1459 args->ar_localflocks = 1; 1460 break; 1461 case Opt_localcaching: 1462 /* Retained for backwards compat only */ 1463 break; 1464 case Opt_debug: 1465 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1466 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1467 args->ar_debug = result.boolean; 1468 break; 1469 case Opt_upgrade: 1470 /* Retained for backwards compat only */ 1471 break; 1472 case Opt_acl: 1473 args->ar_posix_acl = result.boolean; 1474 break; 1475 case Opt_quota_flag: 1476 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; 1477 break; 1478 case Opt_quota: 1479 args->ar_quota = result.int_32; 1480 break; 1481 case Opt_suiddir: 1482 args->ar_suiddir = result.boolean; 1483 break; 1484 case Opt_data: 1485 /* The uint_32 result maps directly to GFS2_DATA_* */ 1486 args->ar_data = result.uint_32; 1487 break; 1488 case Opt_meta: 1489 args->ar_meta = 1; 1490 break; 1491 case Opt_discard: 1492 args->ar_discard = result.boolean; 1493 break; 1494 case Opt_commit: 1495 if (result.int_32 <= 0) 1496 return invalfc(fc, "commit mount option requires a positive numeric argument"); 1497 args->ar_commit = result.int_32; 1498 break; 1499 case Opt_statfs_quantum: 1500 if (result.int_32 < 0) 1501 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); 1502 args->ar_statfs_quantum = result.int_32; 1503 break; 1504 case Opt_quota_quantum: 1505 if (result.int_32 <= 0) 1506 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); 1507 args->ar_quota_quantum = result.int_32; 1508 break; 1509 case Opt_statfs_percent: 1510 if (result.int_32 < 0 || result.int_32 > 100) 1511 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); 1512 args->ar_statfs_percent = result.int_32; 1513 break; 1514 case Opt_errors: 1515 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1516 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1517 args->ar_errors = result.uint_32; 1518 break; 1519 case Opt_barrier: 1520 args->ar_nobarrier = result.boolean; 1521 break; 1522 case Opt_rgrplvb: 1523 args->ar_rgrplvb = result.boolean; 1524 args->ar_got_rgrplvb = 1; 1525 break; 1526 case Opt_loccookie: 1527 args->ar_loccookie = result.boolean; 1528 break; 1529 default: 1530 return invalfc(fc, "invalid mount option: %s", param->key); 1531 } 1532 return 0; 1533 } 1534 1535 static int gfs2_reconfigure(struct fs_context *fc) 1536 { 1537 struct super_block *sb = fc->root->d_sb; 1538 struct gfs2_sbd *sdp = sb->s_fs_info; 1539 struct gfs2_args *oldargs = &sdp->sd_args; 1540 struct gfs2_args *newargs = fc->fs_private; 1541 struct gfs2_tune *gt = &sdp->sd_tune; 1542 int error = 0; 1543 1544 sync_filesystem(sb); 1545 1546 spin_lock(>->gt_spin); 1547 oldargs->ar_commit = gt->gt_logd_secs; 1548 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1549 if (gt->gt_statfs_slow) 1550 oldargs->ar_statfs_quantum = 0; 1551 else 1552 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1553 spin_unlock(>->gt_spin); 1554 1555 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1556 errorfc(fc, "reconfiguration of locking protocol not allowed"); 1557 return -EINVAL; 1558 } 1559 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1560 errorfc(fc, "reconfiguration of lock table not allowed"); 1561 return -EINVAL; 1562 } 1563 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1564 errorfc(fc, "reconfiguration of host data not allowed"); 1565 return -EINVAL; 1566 } 1567 if (newargs->ar_spectator != oldargs->ar_spectator) { 1568 errorfc(fc, "reconfiguration of spectator mode not allowed"); 1569 return -EINVAL; 1570 } 1571 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1572 errorfc(fc, "reconfiguration of localflocks not allowed"); 1573 return -EINVAL; 1574 } 1575 if (newargs->ar_meta != oldargs->ar_meta) { 1576 errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); 1577 return -EINVAL; 1578 } 1579 if (oldargs->ar_spectator) 1580 fc->sb_flags |= SB_RDONLY; 1581 1582 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1583 struct gfs2_holder freeze_gh; 1584 1585 error = gfs2_freeze_lock(sdp, &freeze_gh, 0); 1586 if (error) 1587 return -EINVAL; 1588 1589 if (fc->sb_flags & SB_RDONLY) { 1590 gfs2_make_fs_ro(sdp); 1591 } else { 1592 error = gfs2_make_fs_rw(sdp); 1593 if (error) 1594 errorfc(fc, "unable to remount read-write"); 1595 } 1596 gfs2_freeze_unlock(&freeze_gh); 1597 } 1598 sdp->sd_args = *newargs; 1599 1600 if (sdp->sd_args.ar_posix_acl) 1601 sb->s_flags |= SB_POSIXACL; 1602 else 1603 sb->s_flags &= ~SB_POSIXACL; 1604 if (sdp->sd_args.ar_nobarrier) 1605 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1606 else 1607 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1608 spin_lock(>->gt_spin); 1609 gt->gt_logd_secs = newargs->ar_commit; 1610 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1611 if (newargs->ar_statfs_quantum) { 1612 gt->gt_statfs_slow = 0; 1613 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1614 } 1615 else { 1616 gt->gt_statfs_slow = 1; 1617 gt->gt_statfs_quantum = 30; 1618 } 1619 spin_unlock(>->gt_spin); 1620 1621 gfs2_online_uevent(sdp); 1622 return error; 1623 } 1624 1625 static const struct fs_context_operations gfs2_context_ops = { 1626 .free = gfs2_fc_free, 1627 .parse_param = gfs2_parse_param, 1628 .get_tree = gfs2_get_tree, 1629 .reconfigure = gfs2_reconfigure, 1630 }; 1631 1632 /* Set up the filesystem mount context */ 1633 static int gfs2_init_fs_context(struct fs_context *fc) 1634 { 1635 struct gfs2_args *args; 1636 1637 args = kmalloc(sizeof(*args), GFP_KERNEL); 1638 if (args == NULL) 1639 return -ENOMEM; 1640 1641 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1642 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1643 1644 *args = sdp->sd_args; 1645 } else { 1646 memset(args, 0, sizeof(*args)); 1647 args->ar_quota = GFS2_QUOTA_DEFAULT; 1648 args->ar_data = GFS2_DATA_DEFAULT; 1649 args->ar_commit = 30; 1650 args->ar_statfs_quantum = 30; 1651 args->ar_quota_quantum = 60; 1652 args->ar_errors = GFS2_ERRORS_DEFAULT; 1653 } 1654 fc->fs_private = args; 1655 fc->ops = &gfs2_context_ops; 1656 return 0; 1657 } 1658 1659 static int set_meta_super(struct super_block *s, struct fs_context *fc) 1660 { 1661 return -EINVAL; 1662 } 1663 1664 static int test_meta_super(struct super_block *s, struct fs_context *fc) 1665 { 1666 return (fc->sget_key == s->s_bdev); 1667 } 1668 1669 static int gfs2_meta_get_tree(struct fs_context *fc) 1670 { 1671 struct super_block *s; 1672 struct gfs2_sbd *sdp; 1673 struct path path; 1674 int error; 1675 1676 if (!fc->source || !*fc->source) 1677 return -EINVAL; 1678 1679 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1680 if (error) { 1681 pr_warn("path_lookup on %s returned error %d\n", 1682 fc->source, error); 1683 return error; 1684 } 1685 fc->fs_type = &gfs2_fs_type; 1686 fc->sget_key = path.dentry->d_sb->s_bdev; 1687 s = sget_fc(fc, test_meta_super, set_meta_super); 1688 path_put(&path); 1689 if (IS_ERR(s)) { 1690 pr_warn("gfs2 mount does not exist\n"); 1691 return PTR_ERR(s); 1692 } 1693 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1694 deactivate_locked_super(s); 1695 return -EBUSY; 1696 } 1697 sdp = s->s_fs_info; 1698 fc->root = dget(sdp->sd_master_dir); 1699 return 0; 1700 } 1701 1702 static const struct fs_context_operations gfs2_meta_context_ops = { 1703 .free = gfs2_fc_free, 1704 .get_tree = gfs2_meta_get_tree, 1705 }; 1706 1707 static int gfs2_meta_init_fs_context(struct fs_context *fc) 1708 { 1709 int ret = gfs2_init_fs_context(fc); 1710 1711 if (ret) 1712 return ret; 1713 1714 fc->ops = &gfs2_meta_context_ops; 1715 return 0; 1716 } 1717 1718 static void gfs2_kill_sb(struct super_block *sb) 1719 { 1720 struct gfs2_sbd *sdp = sb->s_fs_info; 1721 1722 if (sdp == NULL) { 1723 kill_block_super(sb); 1724 return; 1725 } 1726 1727 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1728 dput(sdp->sd_root_dir); 1729 dput(sdp->sd_master_dir); 1730 sdp->sd_root_dir = NULL; 1731 sdp->sd_master_dir = NULL; 1732 shrink_dcache_sb(sb); 1733 kill_block_super(sb); 1734 } 1735 1736 struct file_system_type gfs2_fs_type = { 1737 .name = "gfs2", 1738 .fs_flags = FS_REQUIRES_DEV, 1739 .init_fs_context = gfs2_init_fs_context, 1740 .parameters = gfs2_fs_parameters, 1741 .kill_sb = gfs2_kill_sb, 1742 .owner = THIS_MODULE, 1743 }; 1744 MODULE_ALIAS_FS("gfs2"); 1745 1746 struct file_system_type gfs2meta_fs_type = { 1747 .name = "gfs2meta", 1748 .fs_flags = FS_REQUIRES_DEV, 1749 .init_fs_context = gfs2_meta_init_fs_context, 1750 .owner = THIS_MODULE, 1751 }; 1752 MODULE_ALIAS_FS("gfs2meta"); 1753