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(GFP_NOFS, 1); 255 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 256 bio_set_dev(bio, sb->s_bdev); 257 bio_add_page(bio, page, PAGE_SIZE, 0); 258 259 bio->bi_end_io = end_bio_io_page; 260 bio->bi_private = page; 261 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META); 262 submit_bio(bio); 263 wait_on_page_locked(page); 264 bio_put(bio); 265 if (!PageUptodate(page)) { 266 __free_page(page); 267 return -EIO; 268 } 269 p = kmap(page); 270 gfs2_sb_in(sdp, p); 271 kunmap(page); 272 __free_page(page); 273 return gfs2_check_sb(sdp, silent); 274 } 275 276 /** 277 * gfs2_read_sb - Read super block 278 * @sdp: The GFS2 superblock 279 * @silent: Don't print message if mount fails 280 * 281 */ 282 283 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 284 { 285 u32 hash_blocks, ind_blocks, leaf_blocks; 286 u32 tmp_blocks; 287 unsigned int x; 288 int error; 289 290 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 291 if (error) { 292 if (!silent) 293 fs_err(sdp, "can't read superblock\n"); 294 return error; 295 } 296 297 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 298 GFS2_BASIC_BLOCK_SHIFT; 299 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 300 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 301 sizeof(struct gfs2_dinode)) / sizeof(u64); 302 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 303 sizeof(struct gfs2_meta_header)) / sizeof(u64); 304 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize - 305 sizeof(struct gfs2_log_descriptor)) / sizeof(u64); 306 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 307 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 308 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 309 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 310 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 311 sizeof(struct gfs2_meta_header)) / 312 sizeof(struct gfs2_quota_change); 313 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 314 sizeof(struct gfs2_meta_header)) 315 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 316 317 /* 318 * We always keep at least one block reserved for revokes in 319 * transactions. This greatly simplifies allocating additional 320 * revoke blocks. 321 */ 322 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs); 323 324 /* Compute maximum reservation required to add a entry to a directory */ 325 326 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 327 sdp->sd_jbsize); 328 329 ind_blocks = 0; 330 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 331 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 332 ind_blocks += tmp_blocks; 333 } 334 335 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 336 337 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 338 339 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 340 sizeof(struct gfs2_dinode); 341 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 342 for (x = 2;; x++) { 343 u64 space, d; 344 u32 m; 345 346 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 347 d = space; 348 m = do_div(d, sdp->sd_inptrs); 349 350 if (d != sdp->sd_heightsize[x - 1] || m) 351 break; 352 sdp->sd_heightsize[x] = space; 353 } 354 sdp->sd_max_height = x; 355 sdp->sd_heightsize[x] = ~0; 356 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 357 358 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 359 sizeof(struct gfs2_leaf)) / 360 GFS2_MIN_DIRENT_SIZE; 361 return 0; 362 } 363 364 static int init_names(struct gfs2_sbd *sdp, int silent) 365 { 366 char *proto, *table; 367 int error = 0; 368 369 proto = sdp->sd_args.ar_lockproto; 370 table = sdp->sd_args.ar_locktable; 371 372 /* Try to autodetect */ 373 374 if (!proto[0] || !table[0]) { 375 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 376 if (error) 377 return error; 378 379 if (!proto[0]) 380 proto = sdp->sd_sb.sb_lockproto; 381 if (!table[0]) 382 table = sdp->sd_sb.sb_locktable; 383 } 384 385 if (!table[0]) 386 table = sdp->sd_vfs->s_id; 387 388 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 389 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 390 391 table = sdp->sd_table_name; 392 while ((table = strchr(table, '/'))) 393 *table = '_'; 394 395 return error; 396 } 397 398 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 399 int undo) 400 { 401 int error = 0; 402 403 if (undo) 404 goto fail_trans; 405 406 error = gfs2_glock_nq_num(sdp, 407 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 408 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 409 mount_gh); 410 if (error) { 411 fs_err(sdp, "can't acquire mount glock: %d\n", error); 412 goto fail; 413 } 414 415 error = gfs2_glock_nq_num(sdp, 416 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 417 LM_ST_SHARED, 418 LM_FLAG_NOEXP | GL_EXACT, 419 &sdp->sd_live_gh); 420 if (error) { 421 fs_err(sdp, "can't acquire live glock: %d\n", error); 422 goto fail_mount; 423 } 424 425 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 426 CREATE, &sdp->sd_rename_gl); 427 if (error) { 428 fs_err(sdp, "can't create rename glock: %d\n", error); 429 goto fail_live; 430 } 431 432 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 433 CREATE, &sdp->sd_freeze_gl); 434 if (error) { 435 fs_err(sdp, "can't create transaction glock: %d\n", error); 436 goto fail_rename; 437 } 438 439 return 0; 440 441 fail_trans: 442 gfs2_glock_put(sdp->sd_freeze_gl); 443 fail_rename: 444 gfs2_glock_put(sdp->sd_rename_gl); 445 fail_live: 446 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 447 fail_mount: 448 gfs2_glock_dq_uninit(mount_gh); 449 fail: 450 return error; 451 } 452 453 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 454 u64 no_addr, const char *name) 455 { 456 struct gfs2_sbd *sdp = sb->s_fs_info; 457 struct dentry *dentry; 458 struct inode *inode; 459 460 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 461 GFS2_BLKST_FREE /* ignore */); 462 if (IS_ERR(inode)) { 463 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 464 return PTR_ERR(inode); 465 } 466 dentry = d_make_root(inode); 467 if (!dentry) { 468 fs_err(sdp, "can't alloc %s dentry\n", name); 469 return -ENOMEM; 470 } 471 *dptr = dentry; 472 return 0; 473 } 474 475 static int init_sb(struct gfs2_sbd *sdp, int silent) 476 { 477 struct super_block *sb = sdp->sd_vfs; 478 struct gfs2_holder sb_gh; 479 u64 no_addr; 480 int ret; 481 482 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 483 LM_ST_SHARED, 0, &sb_gh); 484 if (ret) { 485 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 486 return ret; 487 } 488 489 ret = gfs2_read_sb(sdp, silent); 490 if (ret) { 491 fs_err(sdp, "can't read superblock: %d\n", ret); 492 goto out; 493 } 494 495 switch(sdp->sd_sb.sb_fs_format) { 496 case GFS2_FS_FORMAT_MAX: 497 sb->s_xattr = gfs2_xattr_handlers_max; 498 break; 499 500 case GFS2_FS_FORMAT_MIN: 501 sb->s_xattr = gfs2_xattr_handlers_min; 502 break; 503 504 default: 505 BUG(); 506 } 507 508 /* Set up the buffer cache and SB for real */ 509 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 510 ret = -EINVAL; 511 fs_err(sdp, "FS block size (%u) is too small for device " 512 "block size (%u)\n", 513 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 514 goto out; 515 } 516 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 517 ret = -EINVAL; 518 fs_err(sdp, "FS block size (%u) is too big for machine " 519 "page size (%u)\n", 520 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 521 goto out; 522 } 523 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 524 525 /* Get the root inode */ 526 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 527 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 528 if (ret) 529 goto out; 530 531 /* Get the master inode */ 532 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 533 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 534 if (ret) { 535 dput(sdp->sd_root_dir); 536 goto out; 537 } 538 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 539 out: 540 gfs2_glock_dq_uninit(&sb_gh); 541 return ret; 542 } 543 544 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 545 { 546 char *message = "FIRSTMOUNT=Done"; 547 char *envp[] = { message, NULL }; 548 549 fs_info(sdp, "first mount done, others may mount\n"); 550 551 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 552 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 553 554 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 555 } 556 557 /** 558 * gfs2_jindex_hold - Grab a lock on the jindex 559 * @sdp: The GFS2 superblock 560 * @ji_gh: the holder for the jindex glock 561 * 562 * Returns: errno 563 */ 564 565 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 566 { 567 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 568 struct qstr name; 569 char buf[20]; 570 struct gfs2_jdesc *jd; 571 int error; 572 573 name.name = buf; 574 575 mutex_lock(&sdp->sd_jindex_mutex); 576 577 for (;;) { 578 struct gfs2_inode *jip; 579 580 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 581 if (error) 582 break; 583 584 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 585 name.hash = gfs2_disk_hash(name.name, name.len); 586 587 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 588 if (error == -ENOENT) { 589 error = 0; 590 break; 591 } 592 593 gfs2_glock_dq_uninit(ji_gh); 594 595 if (error) 596 break; 597 598 error = -ENOMEM; 599 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 600 if (!jd) 601 break; 602 603 INIT_LIST_HEAD(&jd->extent_list); 604 INIT_LIST_HEAD(&jd->jd_revoke_list); 605 606 INIT_WORK(&jd->jd_work, gfs2_recover_func); 607 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 608 if (IS_ERR_OR_NULL(jd->jd_inode)) { 609 if (!jd->jd_inode) 610 error = -ENOENT; 611 else 612 error = PTR_ERR(jd->jd_inode); 613 kfree(jd); 614 break; 615 } 616 617 d_mark_dontcache(jd->jd_inode); 618 spin_lock(&sdp->sd_jindex_spin); 619 jd->jd_jid = sdp->sd_journals++; 620 jip = GFS2_I(jd->jd_inode); 621 jd->jd_no_addr = jip->i_no_addr; 622 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 623 spin_unlock(&sdp->sd_jindex_spin); 624 } 625 626 mutex_unlock(&sdp->sd_jindex_mutex); 627 628 return error; 629 } 630 631 /** 632 * init_statfs - look up and initialize master and local (per node) statfs inodes 633 * @sdp: The GFS2 superblock 634 * 635 * This should be called after the jindex is initialized in init_journal() and 636 * before gfs2_journal_recovery() is called because we need to be able to write 637 * to these inodes during recovery. 638 * 639 * Returns: errno 640 */ 641 static int init_statfs(struct gfs2_sbd *sdp) 642 { 643 int error = 0; 644 struct inode *master = d_inode(sdp->sd_master_dir); 645 struct inode *pn = NULL; 646 char buf[30]; 647 struct gfs2_jdesc *jd; 648 struct gfs2_inode *ip; 649 650 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 651 if (IS_ERR(sdp->sd_statfs_inode)) { 652 error = PTR_ERR(sdp->sd_statfs_inode); 653 fs_err(sdp, "can't read in statfs inode: %d\n", error); 654 goto out; 655 } 656 if (sdp->sd_args.ar_spectator) 657 goto out; 658 659 pn = gfs2_lookup_simple(master, "per_node"); 660 if (IS_ERR(pn)) { 661 error = PTR_ERR(pn); 662 fs_err(sdp, "can't find per_node directory: %d\n", error); 663 goto put_statfs; 664 } 665 666 /* For each jid, lookup the corresponding local statfs inode in the 667 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */ 668 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 669 struct local_statfs_inode *lsi = 670 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS); 671 if (!lsi) { 672 error = -ENOMEM; 673 goto free_local; 674 } 675 sprintf(buf, "statfs_change%u", jd->jd_jid); 676 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf); 677 if (IS_ERR(lsi->si_sc_inode)) { 678 error = PTR_ERR(lsi->si_sc_inode); 679 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n", 680 jd->jd_jid, error); 681 kfree(lsi); 682 goto free_local; 683 } 684 lsi->si_jid = jd->jd_jid; 685 if (jd->jd_jid == sdp->sd_jdesc->jd_jid) 686 sdp->sd_sc_inode = lsi->si_sc_inode; 687 688 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list); 689 } 690 691 iput(pn); 692 pn = NULL; 693 ip = GFS2_I(sdp->sd_sc_inode); 694 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 695 &sdp->sd_sc_gh); 696 if (error) { 697 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 698 goto free_local; 699 } 700 /* read in the local statfs buffer - other nodes don't change it. */ 701 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh); 702 if (error) { 703 fs_err(sdp, "Cannot read in local statfs: %d\n", error); 704 goto unlock_sd_gh; 705 } 706 return 0; 707 708 unlock_sd_gh: 709 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 710 free_local: 711 free_local_statfs_inodes(sdp); 712 iput(pn); 713 put_statfs: 714 iput(sdp->sd_statfs_inode); 715 out: 716 return error; 717 } 718 719 /* Uninitialize and free up memory used by the list of statfs inodes */ 720 static void uninit_statfs(struct gfs2_sbd *sdp) 721 { 722 if (!sdp->sd_args.ar_spectator) { 723 brelse(sdp->sd_sc_bh); 724 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 725 free_local_statfs_inodes(sdp); 726 } 727 iput(sdp->sd_statfs_inode); 728 } 729 730 static int init_journal(struct gfs2_sbd *sdp, int undo) 731 { 732 struct inode *master = d_inode(sdp->sd_master_dir); 733 struct gfs2_holder ji_gh; 734 struct gfs2_inode *ip; 735 int jindex = 1; 736 int error = 0; 737 738 if (undo) { 739 jindex = 0; 740 goto fail_statfs; 741 } 742 743 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 744 if (IS_ERR(sdp->sd_jindex)) { 745 fs_err(sdp, "can't lookup journal index: %d\n", error); 746 return PTR_ERR(sdp->sd_jindex); 747 } 748 749 /* Load in the journal index special file */ 750 751 error = gfs2_jindex_hold(sdp, &ji_gh); 752 if (error) { 753 fs_err(sdp, "can't read journal index: %d\n", error); 754 goto fail; 755 } 756 757 error = -EUSERS; 758 if (!gfs2_jindex_size(sdp)) { 759 fs_err(sdp, "no journals!\n"); 760 goto fail_jindex; 761 } 762 763 atomic_set(&sdp->sd_log_blks_needed, 0); 764 if (sdp->sd_args.ar_spectator) { 765 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 766 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 767 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 768 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 769 } else { 770 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 771 fs_err(sdp, "can't mount journal #%u\n", 772 sdp->sd_lockstruct.ls_jid); 773 fs_err(sdp, "there are only %u journals (0 - %u)\n", 774 gfs2_jindex_size(sdp), 775 gfs2_jindex_size(sdp) - 1); 776 goto fail_jindex; 777 } 778 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 779 780 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 781 &gfs2_journal_glops, 782 LM_ST_EXCLUSIVE, 783 LM_FLAG_NOEXP | GL_NOCACHE, 784 &sdp->sd_journal_gh); 785 if (error) { 786 fs_err(sdp, "can't acquire journal glock: %d\n", error); 787 goto fail_jindex; 788 } 789 790 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 791 sdp->sd_jinode_gl = ip->i_gl; 792 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 793 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 794 &sdp->sd_jinode_gh); 795 if (error) { 796 fs_err(sdp, "can't acquire journal inode glock: %d\n", 797 error); 798 goto fail_journal_gh; 799 } 800 801 error = gfs2_jdesc_check(sdp->sd_jdesc); 802 if (error) { 803 fs_err(sdp, "my journal (%u) is bad: %d\n", 804 sdp->sd_jdesc->jd_jid, error); 805 goto fail_jinode_gh; 806 } 807 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 808 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 809 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 810 811 /* Map the extents for this journal's blocks */ 812 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 813 } 814 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 815 816 /* Lookup statfs inodes here so journal recovery can use them. */ 817 error = init_statfs(sdp); 818 if (error) 819 goto fail_jinode_gh; 820 821 if (sdp->sd_lockstruct.ls_first) { 822 unsigned int x; 823 for (x = 0; x < sdp->sd_journals; x++) { 824 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 825 826 if (sdp->sd_args.ar_spectator) { 827 error = check_journal_clean(sdp, jd, true); 828 if (error) 829 goto fail_statfs; 830 continue; 831 } 832 error = gfs2_recover_journal(jd, true); 833 if (error) { 834 fs_err(sdp, "error recovering journal %u: %d\n", 835 x, error); 836 goto fail_statfs; 837 } 838 } 839 840 gfs2_others_may_mount(sdp); 841 } else if (!sdp->sd_args.ar_spectator) { 842 error = gfs2_recover_journal(sdp->sd_jdesc, true); 843 if (error) { 844 fs_err(sdp, "error recovering my journal: %d\n", error); 845 goto fail_statfs; 846 } 847 } 848 849 sdp->sd_log_idle = 1; 850 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 851 gfs2_glock_dq_uninit(&ji_gh); 852 jindex = 0; 853 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 854 return 0; 855 856 fail_statfs: 857 uninit_statfs(sdp); 858 fail_jinode_gh: 859 /* A withdraw may have done dq/uninit so now we need to check it */ 860 if (!sdp->sd_args.ar_spectator && 861 gfs2_holder_initialized(&sdp->sd_jinode_gh)) 862 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 863 fail_journal_gh: 864 if (!sdp->sd_args.ar_spectator && 865 gfs2_holder_initialized(&sdp->sd_journal_gh)) 866 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 867 fail_jindex: 868 gfs2_jindex_free(sdp); 869 if (jindex) 870 gfs2_glock_dq_uninit(&ji_gh); 871 fail: 872 iput(sdp->sd_jindex); 873 return error; 874 } 875 876 static struct lock_class_key gfs2_quota_imutex_key; 877 878 static int init_inodes(struct gfs2_sbd *sdp, int undo) 879 { 880 int error = 0; 881 struct inode *master = d_inode(sdp->sd_master_dir); 882 883 if (undo) 884 goto fail_qinode; 885 886 error = init_journal(sdp, undo); 887 complete_all(&sdp->sd_journal_ready); 888 if (error) 889 goto fail; 890 891 /* Read in the resource index inode */ 892 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 893 if (IS_ERR(sdp->sd_rindex)) { 894 error = PTR_ERR(sdp->sd_rindex); 895 fs_err(sdp, "can't get resource index inode: %d\n", error); 896 goto fail_journal; 897 } 898 sdp->sd_rindex_uptodate = 0; 899 900 /* Read in the quota inode */ 901 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 902 if (IS_ERR(sdp->sd_quota_inode)) { 903 error = PTR_ERR(sdp->sd_quota_inode); 904 fs_err(sdp, "can't get quota file inode: %d\n", error); 905 goto fail_rindex; 906 } 907 /* 908 * i_rwsem on quota files is special. Since this inode is hidden system 909 * file, we are safe to define locking ourselves. 910 */ 911 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 912 &gfs2_quota_imutex_key); 913 914 error = gfs2_rindex_update(sdp); 915 if (error) 916 goto fail_qinode; 917 918 return 0; 919 920 fail_qinode: 921 iput(sdp->sd_quota_inode); 922 fail_rindex: 923 gfs2_clear_rgrpd(sdp); 924 iput(sdp->sd_rindex); 925 fail_journal: 926 init_journal(sdp, UNDO); 927 fail: 928 return error; 929 } 930 931 static int init_per_node(struct gfs2_sbd *sdp, int undo) 932 { 933 struct inode *pn = NULL; 934 char buf[30]; 935 int error = 0; 936 struct gfs2_inode *ip; 937 struct inode *master = d_inode(sdp->sd_master_dir); 938 939 if (sdp->sd_args.ar_spectator) 940 return 0; 941 942 if (undo) 943 goto fail_qc_gh; 944 945 pn = gfs2_lookup_simple(master, "per_node"); 946 if (IS_ERR(pn)) { 947 error = PTR_ERR(pn); 948 fs_err(sdp, "can't find per_node directory: %d\n", error); 949 return error; 950 } 951 952 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 953 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 954 if (IS_ERR(sdp->sd_qc_inode)) { 955 error = PTR_ERR(sdp->sd_qc_inode); 956 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 957 goto fail_ut_i; 958 } 959 960 iput(pn); 961 pn = NULL; 962 963 ip = GFS2_I(sdp->sd_qc_inode); 964 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 965 &sdp->sd_qc_gh); 966 if (error) { 967 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 968 goto fail_qc_i; 969 } 970 971 return 0; 972 973 fail_qc_gh: 974 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 975 fail_qc_i: 976 iput(sdp->sd_qc_inode); 977 fail_ut_i: 978 iput(pn); 979 return error; 980 } 981 982 static const match_table_t nolock_tokens = { 983 { Opt_jid, "jid=%d", }, 984 { Opt_err, NULL }, 985 }; 986 987 static const struct lm_lockops nolock_ops = { 988 .lm_proto_name = "lock_nolock", 989 .lm_put_lock = gfs2_glock_free, 990 .lm_tokens = &nolock_tokens, 991 }; 992 993 /** 994 * gfs2_lm_mount - mount a locking protocol 995 * @sdp: the filesystem 996 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 997 * 998 * Returns: errno 999 */ 1000 1001 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 1002 { 1003 const struct lm_lockops *lm; 1004 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 1005 struct gfs2_args *args = &sdp->sd_args; 1006 const char *proto = sdp->sd_proto_name; 1007 const char *table = sdp->sd_table_name; 1008 char *o, *options; 1009 int ret; 1010 1011 if (!strcmp("lock_nolock", proto)) { 1012 lm = &nolock_ops; 1013 sdp->sd_args.ar_localflocks = 1; 1014 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 1015 } else if (!strcmp("lock_dlm", proto)) { 1016 lm = &gfs2_dlm_ops; 1017 #endif 1018 } else { 1019 pr_info("can't find protocol %s\n", proto); 1020 return -ENOENT; 1021 } 1022 1023 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 1024 1025 ls->ls_ops = lm; 1026 ls->ls_first = 1; 1027 1028 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 1029 substring_t tmp[MAX_OPT_ARGS]; 1030 int token, option; 1031 1032 if (!o || !*o) 1033 continue; 1034 1035 token = match_token(o, *lm->lm_tokens, tmp); 1036 switch (token) { 1037 case Opt_jid: 1038 ret = match_int(&tmp[0], &option); 1039 if (ret || option < 0) 1040 goto hostdata_error; 1041 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 1042 ls->ls_jid = option; 1043 break; 1044 case Opt_id: 1045 case Opt_nodir: 1046 /* Obsolete, but left for backward compat purposes */ 1047 break; 1048 case Opt_first: 1049 ret = match_int(&tmp[0], &option); 1050 if (ret || (option != 0 && option != 1)) 1051 goto hostdata_error; 1052 ls->ls_first = option; 1053 break; 1054 case Opt_err: 1055 default: 1056 hostdata_error: 1057 fs_info(sdp, "unknown hostdata (%s)\n", o); 1058 return -EINVAL; 1059 } 1060 } 1061 1062 if (lm->lm_mount == NULL) { 1063 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format); 1064 complete_all(&sdp->sd_locking_init); 1065 return 0; 1066 } 1067 ret = lm->lm_mount(sdp, table); 1068 if (ret == 0) 1069 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n", 1070 sdp->sd_sb.sb_fs_format); 1071 complete_all(&sdp->sd_locking_init); 1072 return ret; 1073 } 1074 1075 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1076 { 1077 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1078 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount) 1079 lm->lm_unmount(sdp); 1080 } 1081 1082 static int wait_on_journal(struct gfs2_sbd *sdp) 1083 { 1084 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1085 return 0; 1086 1087 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1088 ? -EINTR : 0; 1089 } 1090 1091 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1092 { 1093 struct super_block *sb = sdp->sd_vfs; 1094 char ro[20]; 1095 char spectator[20]; 1096 char *envp[] = { ro, spectator, NULL }; 1097 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1098 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1099 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1100 } 1101 1102 static int init_threads(struct gfs2_sbd *sdp) 1103 { 1104 struct task_struct *p; 1105 int error = 0; 1106 1107 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 1108 if (IS_ERR(p)) { 1109 error = PTR_ERR(p); 1110 fs_err(sdp, "can't start logd thread: %d\n", error); 1111 return error; 1112 } 1113 sdp->sd_logd_process = p; 1114 1115 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 1116 if (IS_ERR(p)) { 1117 error = PTR_ERR(p); 1118 fs_err(sdp, "can't start quotad thread: %d\n", error); 1119 goto fail; 1120 } 1121 sdp->sd_quotad_process = p; 1122 return 0; 1123 1124 fail: 1125 kthread_stop(sdp->sd_logd_process); 1126 sdp->sd_logd_process = NULL; 1127 return error; 1128 } 1129 1130 /** 1131 * gfs2_fill_super - Read in superblock 1132 * @sb: The VFS superblock 1133 * @fc: Mount options and flags 1134 * 1135 * Returns: -errno 1136 */ 1137 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1138 { 1139 struct gfs2_args *args = fc->fs_private; 1140 int silent = fc->sb_flags & SB_SILENT; 1141 struct gfs2_sbd *sdp; 1142 struct gfs2_holder mount_gh; 1143 struct gfs2_holder freeze_gh; 1144 int error; 1145 1146 sdp = init_sbd(sb); 1147 if (!sdp) { 1148 pr_warn("can't alloc struct gfs2_sbd\n"); 1149 return -ENOMEM; 1150 } 1151 sdp->sd_args = *args; 1152 1153 if (sdp->sd_args.ar_spectator) { 1154 sb->s_flags |= SB_RDONLY; 1155 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1156 } 1157 if (sdp->sd_args.ar_posix_acl) 1158 sb->s_flags |= SB_POSIXACL; 1159 if (sdp->sd_args.ar_nobarrier) 1160 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1161 1162 sb->s_flags |= SB_NOSEC; 1163 sb->s_magic = GFS2_MAGIC; 1164 sb->s_op = &gfs2_super_ops; 1165 sb->s_d_op = &gfs2_dops; 1166 sb->s_export_op = &gfs2_export_ops; 1167 sb->s_qcop = &gfs2_quotactl_ops; 1168 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1169 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1170 sb->s_time_gran = 1; 1171 sb->s_maxbytes = MAX_LFS_FILESIZE; 1172 1173 /* Set up the buffer cache and fill in some fake block size values 1174 to allow us to read-in the on-disk superblock. */ 1175 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1176 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1177 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1178 GFS2_BASIC_BLOCK_SHIFT; 1179 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1180 1181 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1182 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1183 if (sdp->sd_args.ar_statfs_quantum) { 1184 sdp->sd_tune.gt_statfs_slow = 0; 1185 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1186 } else { 1187 sdp->sd_tune.gt_statfs_slow = 1; 1188 sdp->sd_tune.gt_statfs_quantum = 30; 1189 } 1190 1191 error = init_names(sdp, silent); 1192 if (error) 1193 goto fail_free; 1194 1195 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1196 1197 error = gfs2_sys_fs_add(sdp); 1198 if (error) 1199 goto fail_free; 1200 1201 gfs2_create_debugfs_file(sdp); 1202 1203 error = gfs2_lm_mount(sdp, silent); 1204 if (error) 1205 goto fail_debug; 1206 1207 error = init_locking(sdp, &mount_gh, DO); 1208 if (error) 1209 goto fail_lm; 1210 1211 error = init_sb(sdp, silent); 1212 if (error) 1213 goto fail_locking; 1214 1215 /* Turn rgrplvb on by default if fs format is recent enough */ 1216 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801) 1217 sdp->sd_args.ar_rgrplvb = 1; 1218 1219 error = wait_on_journal(sdp); 1220 if (error) 1221 goto fail_sb; 1222 1223 /* 1224 * If user space has failed to join the cluster or some similar 1225 * failure has occurred, then the journal id will contain a 1226 * negative (error) number. This will then be returned to the 1227 * caller (of the mount syscall). We do this even for spectator 1228 * mounts (which just write a jid of 0 to indicate "ok" even though 1229 * the jid is unused in the spectator case) 1230 */ 1231 if (sdp->sd_lockstruct.ls_jid < 0) { 1232 error = sdp->sd_lockstruct.ls_jid; 1233 sdp->sd_lockstruct.ls_jid = 0; 1234 goto fail_sb; 1235 } 1236 1237 if (sdp->sd_args.ar_spectator) 1238 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1239 sdp->sd_table_name); 1240 else 1241 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1242 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1243 1244 error = init_inodes(sdp, DO); 1245 if (error) 1246 goto fail_sb; 1247 1248 error = init_per_node(sdp, DO); 1249 if (error) 1250 goto fail_inodes; 1251 1252 error = gfs2_statfs_init(sdp); 1253 if (error) { 1254 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1255 goto fail_per_node; 1256 } 1257 1258 if (!sb_rdonly(sb)) { 1259 error = init_threads(sdp); 1260 if (error) { 1261 gfs2_withdraw_delayed(sdp); 1262 goto fail_per_node; 1263 } 1264 } 1265 1266 error = gfs2_freeze_lock(sdp, &freeze_gh, 0); 1267 if (error) 1268 goto fail_per_node; 1269 1270 if (!sb_rdonly(sb)) 1271 error = gfs2_make_fs_rw(sdp); 1272 1273 gfs2_freeze_unlock(&freeze_gh); 1274 if (error) { 1275 if (sdp->sd_quotad_process) 1276 kthread_stop(sdp->sd_quotad_process); 1277 sdp->sd_quotad_process = NULL; 1278 if (sdp->sd_logd_process) 1279 kthread_stop(sdp->sd_logd_process); 1280 sdp->sd_logd_process = NULL; 1281 fs_err(sdp, "can't make FS RW: %d\n", error); 1282 goto fail_per_node; 1283 } 1284 gfs2_glock_dq_uninit(&mount_gh); 1285 gfs2_online_uevent(sdp); 1286 return 0; 1287 1288 fail_per_node: 1289 init_per_node(sdp, UNDO); 1290 fail_inodes: 1291 init_inodes(sdp, UNDO); 1292 fail_sb: 1293 if (sdp->sd_root_dir) 1294 dput(sdp->sd_root_dir); 1295 if (sdp->sd_master_dir) 1296 dput(sdp->sd_master_dir); 1297 if (sb->s_root) 1298 dput(sb->s_root); 1299 sb->s_root = NULL; 1300 fail_locking: 1301 init_locking(sdp, &mount_gh, UNDO); 1302 fail_lm: 1303 complete_all(&sdp->sd_journal_ready); 1304 gfs2_gl_hash_clear(sdp); 1305 gfs2_lm_unmount(sdp); 1306 fail_debug: 1307 gfs2_delete_debugfs_file(sdp); 1308 gfs2_sys_fs_del(sdp); 1309 fail_free: 1310 free_sbd(sdp); 1311 sb->s_fs_info = NULL; 1312 return error; 1313 } 1314 1315 /** 1316 * gfs2_get_tree - Get the GFS2 superblock and root directory 1317 * @fc: The filesystem context 1318 * 1319 * Returns: 0 or -errno on error 1320 */ 1321 static int gfs2_get_tree(struct fs_context *fc) 1322 { 1323 struct gfs2_args *args = fc->fs_private; 1324 struct gfs2_sbd *sdp; 1325 int error; 1326 1327 error = get_tree_bdev(fc, gfs2_fill_super); 1328 if (error) 1329 return error; 1330 1331 sdp = fc->root->d_sb->s_fs_info; 1332 dput(fc->root); 1333 if (args->ar_meta) 1334 fc->root = dget(sdp->sd_master_dir); 1335 else 1336 fc->root = dget(sdp->sd_root_dir); 1337 return 0; 1338 } 1339 1340 static void gfs2_fc_free(struct fs_context *fc) 1341 { 1342 struct gfs2_args *args = fc->fs_private; 1343 1344 kfree(args); 1345 } 1346 1347 enum gfs2_param { 1348 Opt_lockproto, 1349 Opt_locktable, 1350 Opt_hostdata, 1351 Opt_spectator, 1352 Opt_ignore_local_fs, 1353 Opt_localflocks, 1354 Opt_localcaching, 1355 Opt_debug, 1356 Opt_upgrade, 1357 Opt_acl, 1358 Opt_quota, 1359 Opt_quota_flag, 1360 Opt_suiddir, 1361 Opt_data, 1362 Opt_meta, 1363 Opt_discard, 1364 Opt_commit, 1365 Opt_errors, 1366 Opt_statfs_quantum, 1367 Opt_statfs_percent, 1368 Opt_quota_quantum, 1369 Opt_barrier, 1370 Opt_rgrplvb, 1371 Opt_loccookie, 1372 }; 1373 1374 static const struct constant_table gfs2_param_quota[] = { 1375 {"off", GFS2_QUOTA_OFF}, 1376 {"account", GFS2_QUOTA_ACCOUNT}, 1377 {"on", GFS2_QUOTA_ON}, 1378 {} 1379 }; 1380 1381 enum opt_data { 1382 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1383 Opt_data_ordered = GFS2_DATA_ORDERED, 1384 }; 1385 1386 static const struct constant_table gfs2_param_data[] = { 1387 {"writeback", Opt_data_writeback }, 1388 {"ordered", Opt_data_ordered }, 1389 {} 1390 }; 1391 1392 enum opt_errors { 1393 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1394 Opt_errors_panic = GFS2_ERRORS_PANIC, 1395 }; 1396 1397 static const struct constant_table gfs2_param_errors[] = { 1398 {"withdraw", Opt_errors_withdraw }, 1399 {"panic", Opt_errors_panic }, 1400 {} 1401 }; 1402 1403 static const struct fs_parameter_spec gfs2_fs_parameters[] = { 1404 fsparam_string ("lockproto", Opt_lockproto), 1405 fsparam_string ("locktable", Opt_locktable), 1406 fsparam_string ("hostdata", Opt_hostdata), 1407 fsparam_flag ("spectator", Opt_spectator), 1408 fsparam_flag ("norecovery", Opt_spectator), 1409 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1410 fsparam_flag ("localflocks", Opt_localflocks), 1411 fsparam_flag ("localcaching", Opt_localcaching), 1412 fsparam_flag_no("debug", Opt_debug), 1413 fsparam_flag ("upgrade", Opt_upgrade), 1414 fsparam_flag_no("acl", Opt_acl), 1415 fsparam_flag_no("suiddir", Opt_suiddir), 1416 fsparam_enum ("data", Opt_data, gfs2_param_data), 1417 fsparam_flag ("meta", Opt_meta), 1418 fsparam_flag_no("discard", Opt_discard), 1419 fsparam_s32 ("commit", Opt_commit), 1420 fsparam_enum ("errors", Opt_errors, gfs2_param_errors), 1421 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1422 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1423 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1424 fsparam_flag_no("barrier", Opt_barrier), 1425 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1426 fsparam_flag_no("loccookie", Opt_loccookie), 1427 /* quota can be a flag or an enum so it gets special treatment */ 1428 fsparam_flag_no("quota", Opt_quota_flag), 1429 fsparam_enum("quota", Opt_quota, gfs2_param_quota), 1430 {} 1431 }; 1432 1433 /* Parse a single mount parameter */ 1434 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1435 { 1436 struct gfs2_args *args = fc->fs_private; 1437 struct fs_parse_result result; 1438 int o; 1439 1440 o = fs_parse(fc, gfs2_fs_parameters, param, &result); 1441 if (o < 0) 1442 return o; 1443 1444 switch (o) { 1445 case Opt_lockproto: 1446 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1447 break; 1448 case Opt_locktable: 1449 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1450 break; 1451 case Opt_hostdata: 1452 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1453 break; 1454 case Opt_spectator: 1455 args->ar_spectator = 1; 1456 break; 1457 case Opt_ignore_local_fs: 1458 /* Retained for backwards compat only */ 1459 break; 1460 case Opt_localflocks: 1461 args->ar_localflocks = 1; 1462 break; 1463 case Opt_localcaching: 1464 /* Retained for backwards compat only */ 1465 break; 1466 case Opt_debug: 1467 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1468 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1469 args->ar_debug = result.boolean; 1470 break; 1471 case Opt_upgrade: 1472 /* Retained for backwards compat only */ 1473 break; 1474 case Opt_acl: 1475 args->ar_posix_acl = result.boolean; 1476 break; 1477 case Opt_quota_flag: 1478 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; 1479 break; 1480 case Opt_quota: 1481 args->ar_quota = result.int_32; 1482 break; 1483 case Opt_suiddir: 1484 args->ar_suiddir = result.boolean; 1485 break; 1486 case Opt_data: 1487 /* The uint_32 result maps directly to GFS2_DATA_* */ 1488 args->ar_data = result.uint_32; 1489 break; 1490 case Opt_meta: 1491 args->ar_meta = 1; 1492 break; 1493 case Opt_discard: 1494 args->ar_discard = result.boolean; 1495 break; 1496 case Opt_commit: 1497 if (result.int_32 <= 0) 1498 return invalfc(fc, "commit mount option requires a positive numeric argument"); 1499 args->ar_commit = result.int_32; 1500 break; 1501 case Opt_statfs_quantum: 1502 if (result.int_32 < 0) 1503 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); 1504 args->ar_statfs_quantum = result.int_32; 1505 break; 1506 case Opt_quota_quantum: 1507 if (result.int_32 <= 0) 1508 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); 1509 args->ar_quota_quantum = result.int_32; 1510 break; 1511 case Opt_statfs_percent: 1512 if (result.int_32 < 0 || result.int_32 > 100) 1513 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); 1514 args->ar_statfs_percent = result.int_32; 1515 break; 1516 case Opt_errors: 1517 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1518 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1519 args->ar_errors = result.uint_32; 1520 break; 1521 case Opt_barrier: 1522 args->ar_nobarrier = result.boolean; 1523 break; 1524 case Opt_rgrplvb: 1525 args->ar_rgrplvb = result.boolean; 1526 args->ar_got_rgrplvb = 1; 1527 break; 1528 case Opt_loccookie: 1529 args->ar_loccookie = result.boolean; 1530 break; 1531 default: 1532 return invalfc(fc, "invalid mount option: %s", param->key); 1533 } 1534 return 0; 1535 } 1536 1537 static int gfs2_reconfigure(struct fs_context *fc) 1538 { 1539 struct super_block *sb = fc->root->d_sb; 1540 struct gfs2_sbd *sdp = sb->s_fs_info; 1541 struct gfs2_args *oldargs = &sdp->sd_args; 1542 struct gfs2_args *newargs = fc->fs_private; 1543 struct gfs2_tune *gt = &sdp->sd_tune; 1544 int error = 0; 1545 1546 sync_filesystem(sb); 1547 1548 spin_lock(>->gt_spin); 1549 oldargs->ar_commit = gt->gt_logd_secs; 1550 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1551 if (gt->gt_statfs_slow) 1552 oldargs->ar_statfs_quantum = 0; 1553 else 1554 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1555 spin_unlock(>->gt_spin); 1556 1557 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1558 errorfc(fc, "reconfiguration of locking protocol not allowed"); 1559 return -EINVAL; 1560 } 1561 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1562 errorfc(fc, "reconfiguration of lock table not allowed"); 1563 return -EINVAL; 1564 } 1565 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1566 errorfc(fc, "reconfiguration of host data not allowed"); 1567 return -EINVAL; 1568 } 1569 if (newargs->ar_spectator != oldargs->ar_spectator) { 1570 errorfc(fc, "reconfiguration of spectator mode not allowed"); 1571 return -EINVAL; 1572 } 1573 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1574 errorfc(fc, "reconfiguration of localflocks not allowed"); 1575 return -EINVAL; 1576 } 1577 if (newargs->ar_meta != oldargs->ar_meta) { 1578 errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); 1579 return -EINVAL; 1580 } 1581 if (oldargs->ar_spectator) 1582 fc->sb_flags |= SB_RDONLY; 1583 1584 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1585 struct gfs2_holder freeze_gh; 1586 1587 error = gfs2_freeze_lock(sdp, &freeze_gh, 0); 1588 if (error) 1589 return -EINVAL; 1590 1591 if (fc->sb_flags & SB_RDONLY) { 1592 gfs2_make_fs_ro(sdp); 1593 } else { 1594 error = gfs2_make_fs_rw(sdp); 1595 if (error) 1596 errorfc(fc, "unable to remount read-write"); 1597 } 1598 gfs2_freeze_unlock(&freeze_gh); 1599 } 1600 sdp->sd_args = *newargs; 1601 1602 if (sdp->sd_args.ar_posix_acl) 1603 sb->s_flags |= SB_POSIXACL; 1604 else 1605 sb->s_flags &= ~SB_POSIXACL; 1606 if (sdp->sd_args.ar_nobarrier) 1607 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1608 else 1609 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1610 spin_lock(>->gt_spin); 1611 gt->gt_logd_secs = newargs->ar_commit; 1612 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1613 if (newargs->ar_statfs_quantum) { 1614 gt->gt_statfs_slow = 0; 1615 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1616 } 1617 else { 1618 gt->gt_statfs_slow = 1; 1619 gt->gt_statfs_quantum = 30; 1620 } 1621 spin_unlock(>->gt_spin); 1622 1623 gfs2_online_uevent(sdp); 1624 return error; 1625 } 1626 1627 static const struct fs_context_operations gfs2_context_ops = { 1628 .free = gfs2_fc_free, 1629 .parse_param = gfs2_parse_param, 1630 .get_tree = gfs2_get_tree, 1631 .reconfigure = gfs2_reconfigure, 1632 }; 1633 1634 /* Set up the filesystem mount context */ 1635 static int gfs2_init_fs_context(struct fs_context *fc) 1636 { 1637 struct gfs2_args *args; 1638 1639 args = kmalloc(sizeof(*args), GFP_KERNEL); 1640 if (args == NULL) 1641 return -ENOMEM; 1642 1643 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1644 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1645 1646 *args = sdp->sd_args; 1647 } else { 1648 memset(args, 0, sizeof(*args)); 1649 args->ar_quota = GFS2_QUOTA_DEFAULT; 1650 args->ar_data = GFS2_DATA_DEFAULT; 1651 args->ar_commit = 30; 1652 args->ar_statfs_quantum = 30; 1653 args->ar_quota_quantum = 60; 1654 args->ar_errors = GFS2_ERRORS_DEFAULT; 1655 } 1656 fc->fs_private = args; 1657 fc->ops = &gfs2_context_ops; 1658 return 0; 1659 } 1660 1661 static int set_meta_super(struct super_block *s, struct fs_context *fc) 1662 { 1663 return -EINVAL; 1664 } 1665 1666 static int test_meta_super(struct super_block *s, struct fs_context *fc) 1667 { 1668 return (fc->sget_key == s->s_bdev); 1669 } 1670 1671 static int gfs2_meta_get_tree(struct fs_context *fc) 1672 { 1673 struct super_block *s; 1674 struct gfs2_sbd *sdp; 1675 struct path path; 1676 int error; 1677 1678 if (!fc->source || !*fc->source) 1679 return -EINVAL; 1680 1681 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1682 if (error) { 1683 pr_warn("path_lookup on %s returned error %d\n", 1684 fc->source, error); 1685 return error; 1686 } 1687 fc->fs_type = &gfs2_fs_type; 1688 fc->sget_key = path.dentry->d_sb->s_bdev; 1689 s = sget_fc(fc, test_meta_super, set_meta_super); 1690 path_put(&path); 1691 if (IS_ERR(s)) { 1692 pr_warn("gfs2 mount does not exist\n"); 1693 return PTR_ERR(s); 1694 } 1695 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1696 deactivate_locked_super(s); 1697 return -EBUSY; 1698 } 1699 sdp = s->s_fs_info; 1700 fc->root = dget(sdp->sd_master_dir); 1701 return 0; 1702 } 1703 1704 static const struct fs_context_operations gfs2_meta_context_ops = { 1705 .free = gfs2_fc_free, 1706 .get_tree = gfs2_meta_get_tree, 1707 }; 1708 1709 static int gfs2_meta_init_fs_context(struct fs_context *fc) 1710 { 1711 int ret = gfs2_init_fs_context(fc); 1712 1713 if (ret) 1714 return ret; 1715 1716 fc->ops = &gfs2_meta_context_ops; 1717 return 0; 1718 } 1719 1720 static void gfs2_kill_sb(struct super_block *sb) 1721 { 1722 struct gfs2_sbd *sdp = sb->s_fs_info; 1723 1724 if (sdp == NULL) { 1725 kill_block_super(sb); 1726 return; 1727 } 1728 1729 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1730 dput(sdp->sd_root_dir); 1731 dput(sdp->sd_master_dir); 1732 sdp->sd_root_dir = NULL; 1733 sdp->sd_master_dir = NULL; 1734 shrink_dcache_sb(sb); 1735 kill_block_super(sb); 1736 } 1737 1738 struct file_system_type gfs2_fs_type = { 1739 .name = "gfs2", 1740 .fs_flags = FS_REQUIRES_DEV, 1741 .init_fs_context = gfs2_init_fs_context, 1742 .parameters = gfs2_fs_parameters, 1743 .kill_sb = gfs2_kill_sb, 1744 .owner = THIS_MODULE, 1745 }; 1746 MODULE_ALIAS_FS("gfs2"); 1747 1748 struct file_system_type gfs2meta_fs_type = { 1749 .name = "gfs2meta", 1750 .fs_flags = FS_REQUIRES_DEV, 1751 .init_fs_context = gfs2_meta_init_fs_context, 1752 .owner = THIS_MODULE, 1753 }; 1754 MODULE_ALIAS_FS("gfs2meta"); 1755