1/* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12#include <linux/sched.h> 13#include <linux/slab.h> 14#include <linux/spinlock.h> 15#include <linux/completion.h> 16#include <linux/buffer_head.h> 17#include <linux/blkdev.h> 18#include <linux/kthread.h> 19#include <linux/export.h> 20#include <linux/namei.h> 21#include <linux/mount.h> 22#include <linux/gfs2_ondisk.h> 23#include <linux/quotaops.h> 24#include <linux/lockdep.h> 25#include <linux/module.h> 26 27#include "gfs2.h" 28#include "incore.h" 29#include "bmap.h" 30#include "glock.h" 31#include "glops.h" 32#include "inode.h" 33#include "recovery.h" 34#include "rgrp.h" 35#include "super.h" 36#include "sys.h" 37#include "util.h" 38#include "log.h" 39#include "quota.h" 40#include "dir.h" 41#include "meta_io.h" 42#include "trace_gfs2.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 53static 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 = 1 << 18; 62 gt->gt_complain_secs = 10; 63} 64 65static struct gfs2_sbd *init_sbd(struct super_block *sb) 66{ 67 struct gfs2_sbd *sdp; 68 struct address_space *mapping; 69 70 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); 71 if (!sdp) 72 return NULL; 73 74 sb->s_fs_info = sdp; 75 sdp->sd_vfs = sb; 76 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats); 77 if (!sdp->sd_lkstats) { 78 kfree(sdp); 79 return NULL; 80 } 81 82 set_bit(SDF_NOJOURNALID, &sdp->sd_flags); 83 gfs2_tune_init(&sdp->sd_tune); 84 85 init_waitqueue_head(&sdp->sd_glock_wait); 86 atomic_set(&sdp->sd_glock_disposal, 0); 87 init_completion(&sdp->sd_locking_init); 88 init_completion(&sdp->sd_wdack); 89 spin_lock_init(&sdp->sd_statfs_spin); 90 91 spin_lock_init(&sdp->sd_rindex_spin); 92 sdp->sd_rindex_tree.rb_node = NULL; 93 94 INIT_LIST_HEAD(&sdp->sd_jindex_list); 95 spin_lock_init(&sdp->sd_jindex_spin); 96 mutex_init(&sdp->sd_jindex_mutex); 97 init_completion(&sdp->sd_journal_ready); 98 99 INIT_LIST_HEAD(&sdp->sd_quota_list); 100 mutex_init(&sdp->sd_quota_mutex); 101 mutex_init(&sdp->sd_quota_sync_mutex); 102 init_waitqueue_head(&sdp->sd_quota_wait); 103 INIT_LIST_HEAD(&sdp->sd_trunc_list); 104 spin_lock_init(&sdp->sd_trunc_lock); 105 spin_lock_init(&sdp->sd_bitmap_lock); 106 107 mapping = &sdp->sd_aspace; 108 109 address_space_init_once(mapping); 110 mapping->a_ops = &gfs2_rgrp_aops; 111 mapping->host = sb->s_bdev->bd_inode; 112 mapping->flags = 0; 113 mapping_set_gfp_mask(mapping, GFP_NOFS); 114 mapping->private_data = NULL; 115 mapping->writeback_index = 0; 116 117 spin_lock_init(&sdp->sd_log_lock); 118 atomic_set(&sdp->sd_log_pinned, 0); 119 INIT_LIST_HEAD(&sdp->sd_log_le_revoke); 120 INIT_LIST_HEAD(&sdp->sd_log_le_ordered); 121 spin_lock_init(&sdp->sd_ordered_lock); 122 123 init_waitqueue_head(&sdp->sd_log_waitq); 124 init_waitqueue_head(&sdp->sd_logd_waitq); 125 spin_lock_init(&sdp->sd_ail_lock); 126 INIT_LIST_HEAD(&sdp->sd_ail1_list); 127 INIT_LIST_HEAD(&sdp->sd_ail2_list); 128 129 init_rwsem(&sdp->sd_log_flush_lock); 130 atomic_set(&sdp->sd_log_in_flight, 0); 131 atomic_set(&sdp->sd_reserving_log, 0); 132 init_waitqueue_head(&sdp->sd_reserving_log_wait); 133 init_waitqueue_head(&sdp->sd_log_flush_wait); 134 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 135 mutex_init(&sdp->sd_freeze_mutex); 136 137 return sdp; 138} 139 140 141/** 142 * gfs2_check_sb - Check superblock 143 * @sdp: the filesystem 144 * @sb: The superblock 145 * @silent: Don't print a message if the check fails 146 * 147 * Checks the version code of the FS is one that we understand how to 148 * read and that the sizes of the various on-disk structures have not 149 * changed. 150 */ 151 152static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 153{ 154 struct gfs2_sb_host *sb = &sdp->sd_sb; 155 156 if (sb->sb_magic != GFS2_MAGIC || 157 sb->sb_type != GFS2_METATYPE_SB) { 158 if (!silent) 159 pr_warn("not a GFS2 filesystem\n"); 160 return -EINVAL; 161 } 162 163 /* If format numbers match exactly, we're done. */ 164 165 if (sb->sb_fs_format == GFS2_FORMAT_FS && 166 sb->sb_multihost_format == GFS2_FORMAT_MULTI) 167 return 0; 168 169 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 170 171 return -EINVAL; 172} 173 174static void end_bio_io_page(struct bio *bio, int error) 175{ 176 struct page *page = bio->bi_private; 177 178 if (!error) 179 SetPageUptodate(page); 180 else 181 pr_warn("error %d reading superblock\n", error); 182 unlock_page(page); 183} 184 185static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 186{ 187 struct gfs2_sb_host *sb = &sdp->sd_sb; 188 struct super_block *s = sdp->sd_vfs; 189 const struct gfs2_sb *str = buf; 190 191 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 192 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 193 sb->sb_format = be32_to_cpu(str->sb_header.mh_format); 194 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 195 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 196 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 197 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 198 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 199 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 200 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 201 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 202 203 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 204 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 205 memcpy(s->s_uuid, str->sb_uuid, 16); 206} 207 208/** 209 * gfs2_read_super - Read the gfs2 super block from disk 210 * @sdp: The GFS2 super block 211 * @sector: The location of the super block 212 * @error: The error code to return 213 * 214 * This uses the bio functions to read the super block from disk 215 * because we want to be 100% sure that we never read cached data. 216 * A super block is read twice only during each GFS2 mount and is 217 * never written to by the filesystem. The first time its read no 218 * locks are held, and the only details which are looked at are those 219 * relating to the locking protocol. Once locking is up and working, 220 * the sb is read again under the lock to establish the location of 221 * the master directory (contains pointers to journals etc) and the 222 * root directory. 223 * 224 * Returns: 0 on success or error 225 */ 226 227static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 228{ 229 struct super_block *sb = sdp->sd_vfs; 230 struct gfs2_sb *p; 231 struct page *page; 232 struct bio *bio; 233 234 page = alloc_page(GFP_NOFS); 235 if (unlikely(!page)) 236 return -ENOMEM; 237 238 ClearPageUptodate(page); 239 ClearPageDirty(page); 240 lock_page(page); 241 242 bio = bio_alloc(GFP_NOFS, 1); 243 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 244 bio->bi_bdev = sb->s_bdev; 245 bio_add_page(bio, page, PAGE_SIZE, 0); 246 247 bio->bi_end_io = end_bio_io_page; 248 bio->bi_private = page; 249 submit_bio(READ_SYNC | REQ_META, bio); 250 wait_on_page_locked(page); 251 bio_put(bio); 252 if (!PageUptodate(page)) { 253 __free_page(page); 254 return -EIO; 255 } 256 p = kmap(page); 257 gfs2_sb_in(sdp, p); 258 kunmap(page); 259 __free_page(page); 260 return gfs2_check_sb(sdp, silent); 261} 262 263/** 264 * gfs2_read_sb - Read super block 265 * @sdp: The GFS2 superblock 266 * @silent: Don't print message if mount fails 267 * 268 */ 269 270static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 271{ 272 u32 hash_blocks, ind_blocks, leaf_blocks; 273 u32 tmp_blocks; 274 unsigned int x; 275 int error; 276 277 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 278 if (error) { 279 if (!silent) 280 fs_err(sdp, "can't read superblock\n"); 281 return error; 282 } 283 284 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 285 GFS2_BASIC_BLOCK_SHIFT; 286 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; 287 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 288 sizeof(struct gfs2_dinode)) / sizeof(u64); 289 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 290 sizeof(struct gfs2_meta_header)) / sizeof(u64); 291 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 292 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 293 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 294 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 295 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 296 sizeof(struct gfs2_meta_header)) / 297 sizeof(struct gfs2_quota_change); 298 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 299 sizeof(struct gfs2_meta_header)) 300 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 301 302 /* Compute maximum reservation required to add a entry to a directory */ 303 304 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH), 305 sdp->sd_jbsize); 306 307 ind_blocks = 0; 308 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 309 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 310 ind_blocks += tmp_blocks; 311 } 312 313 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 314 315 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 316 317 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 318 sizeof(struct gfs2_dinode); 319 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 320 for (x = 2;; x++) { 321 u64 space, d; 322 u32 m; 323 324 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 325 d = space; 326 m = do_div(d, sdp->sd_inptrs); 327 328 if (d != sdp->sd_heightsize[x - 1] || m) 329 break; 330 sdp->sd_heightsize[x] = space; 331 } 332 sdp->sd_max_height = x; 333 sdp->sd_heightsize[x] = ~0; 334 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 335 336 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize - 337 sizeof(struct gfs2_dinode); 338 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs; 339 for (x = 2;; x++) { 340 u64 space, d; 341 u32 m; 342 343 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs; 344 d = space; 345 m = do_div(d, sdp->sd_inptrs); 346 347 if (d != sdp->sd_jheightsize[x - 1] || m) 348 break; 349 sdp->sd_jheightsize[x] = space; 350 } 351 sdp->sd_max_jheight = x; 352 sdp->sd_jheightsize[x] = ~0; 353 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT); 354 355 return 0; 356} 357 358static int init_names(struct gfs2_sbd *sdp, int silent) 359{ 360 char *proto, *table; 361 int error = 0; 362 363 proto = sdp->sd_args.ar_lockproto; 364 table = sdp->sd_args.ar_locktable; 365 366 /* Try to autodetect */ 367 368 if (!proto[0] || !table[0]) { 369 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 370 if (error) 371 return error; 372 373 if (!proto[0]) 374 proto = sdp->sd_sb.sb_lockproto; 375 if (!table[0]) 376 table = sdp->sd_sb.sb_locktable; 377 } 378 379 if (!table[0]) 380 table = sdp->sd_vfs->s_id; 381 382 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 383 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 384 385 table = sdp->sd_table_name; 386 while ((table = strchr(table, '/'))) 387 *table = '_'; 388 389 return error; 390} 391 392static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 393 int undo) 394{ 395 int error = 0; 396 397 if (undo) 398 goto fail_trans; 399 400 error = gfs2_glock_nq_num(sdp, 401 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 402 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 403 mount_gh); 404 if (error) { 405 fs_err(sdp, "can't acquire mount glock: %d\n", error); 406 goto fail; 407 } 408 409 error = gfs2_glock_nq_num(sdp, 410 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 411 LM_ST_SHARED, 412 LM_FLAG_NOEXP | GL_EXACT, 413 &sdp->sd_live_gh); 414 if (error) { 415 fs_err(sdp, "can't acquire live glock: %d\n", error); 416 goto fail_mount; 417 } 418 419 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 420 CREATE, &sdp->sd_rename_gl); 421 if (error) { 422 fs_err(sdp, "can't create rename glock: %d\n", error); 423 goto fail_live; 424 } 425 426 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 427 CREATE, &sdp->sd_freeze_gl); 428 if (error) { 429 fs_err(sdp, "can't create transaction glock: %d\n", error); 430 goto fail_rename; 431 } 432 433 return 0; 434 435fail_trans: 436 gfs2_glock_put(sdp->sd_freeze_gl); 437fail_rename: 438 gfs2_glock_put(sdp->sd_rename_gl); 439fail_live: 440 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 441fail_mount: 442 gfs2_glock_dq_uninit(mount_gh); 443fail: 444 return error; 445} 446 447static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 448 u64 no_addr, const char *name) 449{ 450 struct gfs2_sbd *sdp = sb->s_fs_info; 451 struct dentry *dentry; 452 struct inode *inode; 453 454 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0); 455 if (IS_ERR(inode)) { 456 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 457 return PTR_ERR(inode); 458 } 459 dentry = d_make_root(inode); 460 if (!dentry) { 461 fs_err(sdp, "can't alloc %s dentry\n", name); 462 return -ENOMEM; 463 } 464 *dptr = dentry; 465 return 0; 466} 467 468static int init_sb(struct gfs2_sbd *sdp, int silent) 469{ 470 struct super_block *sb = sdp->sd_vfs; 471 struct gfs2_holder sb_gh; 472 u64 no_addr; 473 int ret; 474 475 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 476 LM_ST_SHARED, 0, &sb_gh); 477 if (ret) { 478 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 479 return ret; 480 } 481 482 ret = gfs2_read_sb(sdp, silent); 483 if (ret) { 484 fs_err(sdp, "can't read superblock: %d\n", ret); 485 goto out; 486 } 487 488 /* Set up the buffer cache and SB for real */ 489 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 490 ret = -EINVAL; 491 fs_err(sdp, "FS block size (%u) is too small for device " 492 "block size (%u)\n", 493 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 494 goto out; 495 } 496 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 497 ret = -EINVAL; 498 fs_err(sdp, "FS block size (%u) is too big for machine " 499 "page size (%u)\n", 500 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 501 goto out; 502 } 503 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 504 505 /* Get the root inode */ 506 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 507 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 508 if (ret) 509 goto out; 510 511 /* Get the master inode */ 512 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 513 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 514 if (ret) { 515 dput(sdp->sd_root_dir); 516 goto out; 517 } 518 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 519out: 520 gfs2_glock_dq_uninit(&sb_gh); 521 return ret; 522} 523 524static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 525{ 526 char *message = "FIRSTMOUNT=Done"; 527 char *envp[] = { message, NULL }; 528 529 fs_info(sdp, "first mount done, others may mount\n"); 530 531 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 532 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 533 534 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 535} 536 537/** 538 * gfs2_jindex_hold - Grab a lock on the jindex 539 * @sdp: The GFS2 superblock 540 * @ji_gh: the holder for the jindex glock 541 * 542 * Returns: errno 543 */ 544 545static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 546{ 547 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 548 struct qstr name; 549 char buf[20]; 550 struct gfs2_jdesc *jd; 551 int error; 552 553 name.name = buf; 554 555 mutex_lock(&sdp->sd_jindex_mutex); 556 557 for (;;) { 558 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 559 if (error) 560 break; 561 562 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 563 name.hash = gfs2_disk_hash(name.name, name.len); 564 565 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 566 if (error == -ENOENT) { 567 error = 0; 568 break; 569 } 570 571 gfs2_glock_dq_uninit(ji_gh); 572 573 if (error) 574 break; 575 576 error = -ENOMEM; 577 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 578 if (!jd) 579 break; 580 581 INIT_LIST_HEAD(&jd->extent_list); 582 INIT_LIST_HEAD(&jd->jd_revoke_list); 583 584 INIT_WORK(&jd->jd_work, gfs2_recover_func); 585 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 586 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { 587 if (!jd->jd_inode) 588 error = -ENOENT; 589 else 590 error = PTR_ERR(jd->jd_inode); 591 kfree(jd); 592 break; 593 } 594 595 spin_lock(&sdp->sd_jindex_spin); 596 jd->jd_jid = sdp->sd_journals++; 597 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 598 spin_unlock(&sdp->sd_jindex_spin); 599 } 600 601 mutex_unlock(&sdp->sd_jindex_mutex); 602 603 return error; 604} 605 606/** 607 * check_journal_clean - Make sure a journal is clean for a spectator mount 608 * @sdp: The GFS2 superblock 609 * @jd: The journal descriptor 610 * 611 * Returns: 0 if the journal is clean or locked, else an error 612 */ 613static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) 614{ 615 int error; 616 struct gfs2_holder j_gh; 617 struct gfs2_log_header_host head; 618 struct gfs2_inode *ip; 619 620 ip = GFS2_I(jd->jd_inode); 621 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | 622 GL_EXACT | GL_NOCACHE, &j_gh); 623 if (error) { 624 fs_err(sdp, "Error locking journal for spectator mount.\n"); 625 return -EPERM; 626 } 627 error = gfs2_jdesc_check(jd); 628 if (error) { 629 fs_err(sdp, "Error checking journal for spectator mount.\n"); 630 goto out_unlock; 631 } 632 error = gfs2_find_jhead(jd, &head); 633 if (error) { 634 fs_err(sdp, "Error parsing journal for spectator mount.\n"); 635 goto out_unlock; 636 } 637 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 638 error = -EPERM; 639 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " 640 "must not be a spectator.\n", jd->jd_jid); 641 } 642 643out_unlock: 644 gfs2_glock_dq_uninit(&j_gh); 645 return error; 646} 647 648static int init_journal(struct gfs2_sbd *sdp, int undo) 649{ 650 struct inode *master = d_inode(sdp->sd_master_dir); 651 struct gfs2_holder ji_gh; 652 struct gfs2_inode *ip; 653 int jindex = 1; 654 int error = 0; 655 656 if (undo) { 657 jindex = 0; 658 goto fail_jinode_gh; 659 } 660 661 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 662 if (IS_ERR(sdp->sd_jindex)) { 663 fs_err(sdp, "can't lookup journal index: %d\n", error); 664 return PTR_ERR(sdp->sd_jindex); 665 } 666 667 /* Load in the journal index special file */ 668 669 error = gfs2_jindex_hold(sdp, &ji_gh); 670 if (error) { 671 fs_err(sdp, "can't read journal index: %d\n", error); 672 goto fail; 673 } 674 675 error = -EUSERS; 676 if (!gfs2_jindex_size(sdp)) { 677 fs_err(sdp, "no journals!\n"); 678 goto fail_jindex; 679 } 680 681 if (sdp->sd_args.ar_spectator) { 682 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 683 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 684 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 685 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 686 } else { 687 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 688 fs_err(sdp, "can't mount journal #%u\n", 689 sdp->sd_lockstruct.ls_jid); 690 fs_err(sdp, "there are only %u journals (0 - %u)\n", 691 gfs2_jindex_size(sdp), 692 gfs2_jindex_size(sdp) - 1); 693 goto fail_jindex; 694 } 695 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 696 697 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 698 &gfs2_journal_glops, 699 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, 700 &sdp->sd_journal_gh); 701 if (error) { 702 fs_err(sdp, "can't acquire journal glock: %d\n", error); 703 goto fail_jindex; 704 } 705 706 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 707 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 708 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 709 &sdp->sd_jinode_gh); 710 if (error) { 711 fs_err(sdp, "can't acquire journal inode glock: %d\n", 712 error); 713 goto fail_journal_gh; 714 } 715 716 error = gfs2_jdesc_check(sdp->sd_jdesc); 717 if (error) { 718 fs_err(sdp, "my journal (%u) is bad: %d\n", 719 sdp->sd_jdesc->jd_jid, error); 720 goto fail_jinode_gh; 721 } 722 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 723 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 724 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 725 726 /* Map the extents for this journal's blocks */ 727 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 728 } 729 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 730 731 if (sdp->sd_lockstruct.ls_first) { 732 unsigned int x; 733 for (x = 0; x < sdp->sd_journals; x++) { 734 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 735 736 if (sdp->sd_args.ar_spectator) { 737 error = check_journal_clean(sdp, jd); 738 if (error) 739 goto fail_jinode_gh; 740 continue; 741 } 742 error = gfs2_recover_journal(jd, true); 743 if (error) { 744 fs_err(sdp, "error recovering journal %u: %d\n", 745 x, error); 746 goto fail_jinode_gh; 747 } 748 } 749 750 gfs2_others_may_mount(sdp); 751 } else if (!sdp->sd_args.ar_spectator) { 752 error = gfs2_recover_journal(sdp->sd_jdesc, true); 753 if (error) { 754 fs_err(sdp, "error recovering my journal: %d\n", error); 755 goto fail_jinode_gh; 756 } 757 } 758 759 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 760 gfs2_glock_dq_uninit(&ji_gh); 761 jindex = 0; 762 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 763 return 0; 764 765fail_jinode_gh: 766 if (!sdp->sd_args.ar_spectator) 767 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 768fail_journal_gh: 769 if (!sdp->sd_args.ar_spectator) 770 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 771fail_jindex: 772 gfs2_jindex_free(sdp); 773 if (jindex) 774 gfs2_glock_dq_uninit(&ji_gh); 775fail: 776 iput(sdp->sd_jindex); 777 return error; 778} 779 780static struct lock_class_key gfs2_quota_imutex_key; 781 782static int init_inodes(struct gfs2_sbd *sdp, int undo) 783{ 784 int error = 0; 785 struct inode *master = d_inode(sdp->sd_master_dir); 786 787 if (undo) 788 goto fail_qinode; 789 790 error = init_journal(sdp, undo); 791 complete_all(&sdp->sd_journal_ready); 792 if (error) 793 goto fail; 794 795 /* Read in the master statfs inode */ 796 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 797 if (IS_ERR(sdp->sd_statfs_inode)) { 798 error = PTR_ERR(sdp->sd_statfs_inode); 799 fs_err(sdp, "can't read in statfs inode: %d\n", error); 800 goto fail_journal; 801 } 802 803 /* Read in the resource index inode */ 804 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 805 if (IS_ERR(sdp->sd_rindex)) { 806 error = PTR_ERR(sdp->sd_rindex); 807 fs_err(sdp, "can't get resource index inode: %d\n", error); 808 goto fail_statfs; 809 } 810 sdp->sd_rindex_uptodate = 0; 811 812 /* Read in the quota inode */ 813 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 814 if (IS_ERR(sdp->sd_quota_inode)) { 815 error = PTR_ERR(sdp->sd_quota_inode); 816 fs_err(sdp, "can't get quota file inode: %d\n", error); 817 goto fail_rindex; 818 } 819 /* 820 * i_mutex on quota files is special. Since this inode is hidden system 821 * file, we are safe to define locking ourselves. 822 */ 823 lockdep_set_class(&sdp->sd_quota_inode->i_mutex, 824 &gfs2_quota_imutex_key); 825 826 error = gfs2_rindex_update(sdp); 827 if (error) 828 goto fail_qinode; 829 830 return 0; 831 832fail_qinode: 833 iput(sdp->sd_quota_inode); 834fail_rindex: 835 gfs2_clear_rgrpd(sdp); 836 iput(sdp->sd_rindex); 837fail_statfs: 838 iput(sdp->sd_statfs_inode); 839fail_journal: 840 init_journal(sdp, UNDO); 841fail: 842 return error; 843} 844 845static int init_per_node(struct gfs2_sbd *sdp, int undo) 846{ 847 struct inode *pn = NULL; 848 char buf[30]; 849 int error = 0; 850 struct gfs2_inode *ip; 851 struct inode *master = d_inode(sdp->sd_master_dir); 852 853 if (sdp->sd_args.ar_spectator) 854 return 0; 855 856 if (undo) 857 goto fail_qc_gh; 858 859 pn = gfs2_lookup_simple(master, "per_node"); 860 if (IS_ERR(pn)) { 861 error = PTR_ERR(pn); 862 fs_err(sdp, "can't find per_node directory: %d\n", error); 863 return error; 864 } 865 866 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 867 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 868 if (IS_ERR(sdp->sd_sc_inode)) { 869 error = PTR_ERR(sdp->sd_sc_inode); 870 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 871 goto fail; 872 } 873 874 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 875 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 876 if (IS_ERR(sdp->sd_qc_inode)) { 877 error = PTR_ERR(sdp->sd_qc_inode); 878 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 879 goto fail_ut_i; 880 } 881 882 iput(pn); 883 pn = NULL; 884 885 ip = GFS2_I(sdp->sd_sc_inode); 886 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 887 &sdp->sd_sc_gh); 888 if (error) { 889 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 890 goto fail_qc_i; 891 } 892 893 ip = GFS2_I(sdp->sd_qc_inode); 894 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 895 &sdp->sd_qc_gh); 896 if (error) { 897 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 898 goto fail_ut_gh; 899 } 900 901 return 0; 902 903fail_qc_gh: 904 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 905fail_ut_gh: 906 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 907fail_qc_i: 908 iput(sdp->sd_qc_inode); 909fail_ut_i: 910 iput(sdp->sd_sc_inode); 911fail: 912 if (pn) 913 iput(pn); 914 return error; 915} 916 917static const match_table_t nolock_tokens = { 918 { Opt_jid, "jid=%d\n", }, 919 { Opt_err, NULL }, 920}; 921 922static const struct lm_lockops nolock_ops = { 923 .lm_proto_name = "lock_nolock", 924 .lm_put_lock = gfs2_glock_free, 925 .lm_tokens = &nolock_tokens, 926}; 927 928/** 929 * gfs2_lm_mount - mount a locking protocol 930 * @sdp: the filesystem 931 * @args: mount arguments 932 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 933 * 934 * Returns: errno 935 */ 936 937static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 938{ 939 const struct lm_lockops *lm; 940 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 941 struct gfs2_args *args = &sdp->sd_args; 942 const char *proto = sdp->sd_proto_name; 943 const char *table = sdp->sd_table_name; 944 char *o, *options; 945 int ret; 946 947 if (!strcmp("lock_nolock", proto)) { 948 lm = &nolock_ops; 949 sdp->sd_args.ar_localflocks = 1; 950#ifdef CONFIG_GFS2_FS_LOCKING_DLM 951 } else if (!strcmp("lock_dlm", proto)) { 952 lm = &gfs2_dlm_ops; 953#endif 954 } else { 955 pr_info("can't find protocol %s\n", proto); 956 return -ENOENT; 957 } 958 959 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 960 961 ls->ls_ops = lm; 962 ls->ls_first = 1; 963 964 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 965 substring_t tmp[MAX_OPT_ARGS]; 966 int token, option; 967 968 if (!o || !*o) 969 continue; 970 971 token = match_token(o, *lm->lm_tokens, tmp); 972 switch (token) { 973 case Opt_jid: 974 ret = match_int(&tmp[0], &option); 975 if (ret || option < 0) 976 goto hostdata_error; 977 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 978 ls->ls_jid = option; 979 break; 980 case Opt_id: 981 case Opt_nodir: 982 /* Obsolete, but left for backward compat purposes */ 983 break; 984 case Opt_first: 985 ret = match_int(&tmp[0], &option); 986 if (ret || (option != 0 && option != 1)) 987 goto hostdata_error; 988 ls->ls_first = option; 989 break; 990 case Opt_err: 991 default: 992hostdata_error: 993 fs_info(sdp, "unknown hostdata (%s)\n", o); 994 return -EINVAL; 995 } 996 } 997 998 if (lm->lm_mount == NULL) { 999 fs_info(sdp, "Now mounting FS...\n"); 1000 complete_all(&sdp->sd_locking_init); 1001 return 0; 1002 } 1003 ret = lm->lm_mount(sdp, table); 1004 if (ret == 0) 1005 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1006 complete_all(&sdp->sd_locking_init); 1007 return ret; 1008} 1009 1010void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1011{ 1012 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1013 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && 1014 lm->lm_unmount) 1015 lm->lm_unmount(sdp); 1016} 1017 1018static int wait_on_journal(struct gfs2_sbd *sdp) 1019{ 1020 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1021 return 0; 1022 1023 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1024 ? -EINTR : 0; 1025} 1026 1027void gfs2_online_uevent(struct gfs2_sbd *sdp) 1028{ 1029 struct super_block *sb = sdp->sd_vfs; 1030 char ro[20]; 1031 char spectator[20]; 1032 char *envp[] = { ro, spectator, NULL }; 1033 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 1034 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1035 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1036} 1037 1038/** 1039 * fill_super - Read in superblock 1040 * @sb: The VFS superblock 1041 * @data: Mount options 1042 * @silent: Don't complain if it's not a GFS2 filesystem 1043 * 1044 * Returns: errno 1045 */ 1046 1047static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent) 1048{ 1049 struct gfs2_sbd *sdp; 1050 struct gfs2_holder mount_gh; 1051 int error; 1052 1053 sdp = init_sbd(sb); 1054 if (!sdp) { 1055 pr_warn("can't alloc struct gfs2_sbd\n"); 1056 return -ENOMEM; 1057 } 1058 sdp->sd_args = *args; 1059 1060 if (sdp->sd_args.ar_spectator) { 1061 sb->s_flags |= MS_RDONLY; 1062 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1063 } 1064 if (sdp->sd_args.ar_posix_acl) 1065 sb->s_flags |= MS_POSIXACL; 1066 if (sdp->sd_args.ar_nobarrier) 1067 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1068 1069 sb->s_flags |= MS_NOSEC; 1070 sb->s_magic = GFS2_MAGIC; 1071 sb->s_op = &gfs2_super_ops; 1072 sb->s_d_op = &gfs2_dops; 1073 sb->s_export_op = &gfs2_export_ops; 1074 sb->s_xattr = gfs2_xattr_handlers; 1075 sb->s_qcop = &gfs2_quotactl_ops; 1076 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1077 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1078 sb->s_time_gran = 1; 1079 sb->s_maxbytes = MAX_LFS_FILESIZE; 1080 1081 /* Set up the buffer cache and fill in some fake block size values 1082 to allow us to read-in the on-disk superblock. */ 1083 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1084 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1085 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1086 GFS2_BASIC_BLOCK_SHIFT; 1087 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; 1088 1089 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1090 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1091 if (sdp->sd_args.ar_statfs_quantum) { 1092 sdp->sd_tune.gt_statfs_slow = 0; 1093 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1094 } else { 1095 sdp->sd_tune.gt_statfs_slow = 1; 1096 sdp->sd_tune.gt_statfs_quantum = 30; 1097 } 1098 1099 error = init_names(sdp, silent); 1100 if (error) { 1101 /* In this case, we haven't initialized sysfs, so we have to 1102 manually free the sdp. */ 1103 free_percpu(sdp->sd_lkstats); 1104 kfree(sdp); 1105 sb->s_fs_info = NULL; 1106 return error; 1107 } 1108 1109 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name); 1110 1111 error = gfs2_sys_fs_add(sdp); 1112 /* 1113 * If we hit an error here, gfs2_sys_fs_add will have called function 1114 * kobject_put which causes the sysfs usage count to go to zero, which 1115 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1116 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1117 * kobject_put to free sdp. 1118 */ 1119 if (error) 1120 return error; 1121 1122 gfs2_create_debugfs_file(sdp); 1123 1124 error = gfs2_lm_mount(sdp, silent); 1125 if (error) 1126 goto fail_debug; 1127 1128 error = init_locking(sdp, &mount_gh, DO); 1129 if (error) 1130 goto fail_lm; 1131 1132 error = init_sb(sdp, silent); 1133 if (error) 1134 goto fail_locking; 1135 1136 error = wait_on_journal(sdp); 1137 if (error) 1138 goto fail_sb; 1139 1140 /* 1141 * If user space has failed to join the cluster or some similar 1142 * failure has occurred, then the journal id will contain a 1143 * negative (error) number. This will then be returned to the 1144 * caller (of the mount syscall). We do this even for spectator 1145 * mounts (which just write a jid of 0 to indicate "ok" even though 1146 * the jid is unused in the spectator case) 1147 */ 1148 if (sdp->sd_lockstruct.ls_jid < 0) { 1149 error = sdp->sd_lockstruct.ls_jid; 1150 sdp->sd_lockstruct.ls_jid = 0; 1151 goto fail_sb; 1152 } 1153 1154 if (sdp->sd_args.ar_spectator) 1155 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", 1156 sdp->sd_table_name); 1157 else 1158 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", 1159 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1160 1161 error = init_inodes(sdp, DO); 1162 if (error) 1163 goto fail_sb; 1164 1165 error = init_per_node(sdp, DO); 1166 if (error) 1167 goto fail_inodes; 1168 1169 error = gfs2_statfs_init(sdp); 1170 if (error) { 1171 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1172 goto fail_per_node; 1173 } 1174 1175 if (!(sb->s_flags & MS_RDONLY)) { 1176 error = gfs2_make_fs_rw(sdp); 1177 if (error) { 1178 fs_err(sdp, "can't make FS RW: %d\n", error); 1179 goto fail_per_node; 1180 } 1181 } 1182 1183 gfs2_glock_dq_uninit(&mount_gh); 1184 gfs2_online_uevent(sdp); 1185 return 0; 1186 1187fail_per_node: 1188 init_per_node(sdp, UNDO); 1189fail_inodes: 1190 init_inodes(sdp, UNDO); 1191fail_sb: 1192 if (sdp->sd_root_dir) 1193 dput(sdp->sd_root_dir); 1194 if (sdp->sd_master_dir) 1195 dput(sdp->sd_master_dir); 1196 if (sb->s_root) 1197 dput(sb->s_root); 1198 sb->s_root = NULL; 1199fail_locking: 1200 init_locking(sdp, &mount_gh, UNDO); 1201fail_lm: 1202 complete_all(&sdp->sd_journal_ready); 1203 gfs2_gl_hash_clear(sdp); 1204 gfs2_lm_unmount(sdp); 1205fail_debug: 1206 gfs2_delete_debugfs_file(sdp); 1207 free_percpu(sdp->sd_lkstats); 1208 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1209 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1210 gfs2_sys_fs_del(sdp); 1211 sb->s_fs_info = NULL; 1212 return error; 1213} 1214 1215static int set_gfs2_super(struct super_block *s, void *data) 1216{ 1217 s->s_bdev = data; 1218 s->s_dev = s->s_bdev->bd_dev; 1219 1220 /* 1221 * We set the bdi here to the queue backing, file systems can 1222 * overwrite this in ->fill_super() 1223 */ 1224 s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info; 1225 return 0; 1226} 1227 1228static int test_gfs2_super(struct super_block *s, void *ptr) 1229{ 1230 struct block_device *bdev = ptr; 1231 return (bdev == s->s_bdev); 1232} 1233 1234/** 1235 * gfs2_mount - Get the GFS2 superblock 1236 * @fs_type: The GFS2 filesystem type 1237 * @flags: Mount flags 1238 * @dev_name: The name of the device 1239 * @data: The mount arguments 1240 * 1241 * Q. Why not use get_sb_bdev() ? 1242 * A. We need to select one of two root directories to mount, independent 1243 * of whether this is the initial, or subsequent, mount of this sb 1244 * 1245 * Returns: 0 or -ve on error 1246 */ 1247 1248static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags, 1249 const char *dev_name, void *data) 1250{ 1251 struct block_device *bdev; 1252 struct super_block *s; 1253 fmode_t mode = FMODE_READ | FMODE_EXCL; 1254 int error; 1255 struct gfs2_args args; 1256 struct gfs2_sbd *sdp; 1257 1258 if (!(flags & MS_RDONLY)) 1259 mode |= FMODE_WRITE; 1260 1261 bdev = blkdev_get_by_path(dev_name, mode, fs_type); 1262 if (IS_ERR(bdev)) 1263 return ERR_CAST(bdev); 1264 1265 /* 1266 * once the super is inserted into the list by sget, s_umount 1267 * will protect the lockfs code from trying to start a snapshot 1268 * while we are mounting 1269 */ 1270 mutex_lock(&bdev->bd_fsfreeze_mutex); 1271 if (bdev->bd_fsfreeze_count > 0) { 1272 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1273 error = -EBUSY; 1274 goto error_bdev; 1275 } 1276 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev); 1277 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1278 error = PTR_ERR(s); 1279 if (IS_ERR(s)) 1280 goto error_bdev; 1281 1282 if (s->s_root) { 1283 /* 1284 * s_umount nests inside bd_mutex during 1285 * __invalidate_device(). blkdev_put() acquires 1286 * bd_mutex and can't be called under s_umount. Drop 1287 * s_umount temporarily. This is safe as we're 1288 * holding an active reference. 1289 */ 1290 up_write(&s->s_umount); 1291 blkdev_put(bdev, mode); 1292 down_write(&s->s_umount); 1293 } 1294 1295 memset(&args, 0, sizeof(args)); 1296 args.ar_quota = GFS2_QUOTA_DEFAULT; 1297 args.ar_data = GFS2_DATA_DEFAULT; 1298 args.ar_commit = 30; 1299 args.ar_statfs_quantum = 30; 1300 args.ar_quota_quantum = 60; 1301 args.ar_errors = GFS2_ERRORS_DEFAULT; 1302 1303 error = gfs2_mount_args(&args, data); 1304 if (error) { 1305 pr_warn("can't parse mount arguments\n"); 1306 goto error_super; 1307 } 1308 1309 if (s->s_root) { 1310 error = -EBUSY; 1311 if ((flags ^ s->s_flags) & MS_RDONLY) 1312 goto error_super; 1313 } else { 1314 char b[BDEVNAME_SIZE]; 1315 1316 s->s_mode = mode; 1317 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); 1318 sb_set_blocksize(s, block_size(bdev)); 1319 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0); 1320 if (error) 1321 goto error_super; 1322 s->s_flags |= MS_ACTIVE; 1323 bdev->bd_super = s; 1324 } 1325 1326 sdp = s->s_fs_info; 1327 if (args.ar_meta) 1328 return dget(sdp->sd_master_dir); 1329 else 1330 return dget(sdp->sd_root_dir); 1331 1332error_super: 1333 deactivate_locked_super(s); 1334 return ERR_PTR(error); 1335error_bdev: 1336 blkdev_put(bdev, mode); 1337 return ERR_PTR(error); 1338} 1339 1340static int set_meta_super(struct super_block *s, void *ptr) 1341{ 1342 return -EINVAL; 1343} 1344 1345static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type, 1346 int flags, const char *dev_name, void *data) 1347{ 1348 struct super_block *s; 1349 struct gfs2_sbd *sdp; 1350 struct path path; 1351 int error; 1352 1353 error = kern_path(dev_name, LOOKUP_FOLLOW, &path); 1354 if (error) { 1355 pr_warn("path_lookup on %s returned error %d\n", 1356 dev_name, error); 1357 return ERR_PTR(error); 1358 } 1359 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags, 1360 d_inode(path.dentry)->i_sb->s_bdev); 1361 path_put(&path); 1362 if (IS_ERR(s)) { 1363 pr_warn("gfs2 mount does not exist\n"); 1364 return ERR_CAST(s); 1365 } 1366 if ((flags ^ s->s_flags) & MS_RDONLY) { 1367 deactivate_locked_super(s); 1368 return ERR_PTR(-EBUSY); 1369 } 1370 sdp = s->s_fs_info; 1371 return dget(sdp->sd_master_dir); 1372} 1373 1374static void gfs2_kill_sb(struct super_block *sb) 1375{ 1376 struct gfs2_sbd *sdp = sb->s_fs_info; 1377 1378 if (sdp == NULL) { 1379 kill_block_super(sb); 1380 return; 1381 } 1382 1383 gfs2_log_flush(sdp, NULL, SYNC_FLUSH); 1384 dput(sdp->sd_root_dir); 1385 dput(sdp->sd_master_dir); 1386 sdp->sd_root_dir = NULL; 1387 sdp->sd_master_dir = NULL; 1388 shrink_dcache_sb(sb); 1389 gfs2_delete_debugfs_file(sdp); 1390 free_percpu(sdp->sd_lkstats); 1391 kill_block_super(sb); 1392} 1393 1394struct file_system_type gfs2_fs_type = { 1395 .name = "gfs2", 1396 .fs_flags = FS_REQUIRES_DEV, 1397 .mount = gfs2_mount, 1398 .kill_sb = gfs2_kill_sb, 1399 .owner = THIS_MODULE, 1400}; 1401MODULE_ALIAS_FS("gfs2"); 1402 1403struct file_system_type gfs2meta_fs_type = { 1404 .name = "gfs2meta", 1405 .fs_flags = FS_REQUIRES_DEV, 1406 .mount = gfs2_mount_meta, 1407 .owner = THIS_MODULE, 1408}; 1409MODULE_ALIAS_FS("gfs2meta"); 1410