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 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 static 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 */ 151 152 static 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 } 173 174 static void end_bio_io_page(struct bio *bio) 175 { 176 struct page *page = bio->bi_private; 177 178 if (!bio->bi_error) 179 SetPageUptodate(page); 180 else 181 pr_warn("error %d reading superblock\n", bio->bi_error); 182 unlock_page(page); 183 } 184 185 static 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 */ 226 227 static 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 bio_set_op_attrs(bio, REQ_OP_READ, READ_SYNC | REQ_META); 250 submit_bio(bio); 251 wait_on_page_locked(page); 252 bio_put(bio); 253 if (!PageUptodate(page)) { 254 __free_page(page); 255 return -EIO; 256 } 257 p = kmap(page); 258 gfs2_sb_in(sdp, p); 259 kunmap(page); 260 __free_page(page); 261 return gfs2_check_sb(sdp, silent); 262 } 263 264 /** 265 * gfs2_read_sb - Read super block 266 * @sdp: The GFS2 superblock 267 * @silent: Don't print message if mount fails 268 * 269 */ 270 271 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 272 { 273 u32 hash_blocks, ind_blocks, leaf_blocks; 274 u32 tmp_blocks; 275 unsigned int x; 276 int error; 277 278 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 279 if (error) { 280 if (!silent) 281 fs_err(sdp, "can't read superblock\n"); 282 return error; 283 } 284 285 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 286 GFS2_BASIC_BLOCK_SHIFT; 287 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 288 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 289 sizeof(struct gfs2_dinode)) / sizeof(u64); 290 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 291 sizeof(struct gfs2_meta_header)) / sizeof(u64); 292 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 293 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 294 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 295 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 296 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 297 sizeof(struct gfs2_meta_header)) / 298 sizeof(struct gfs2_quota_change); 299 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 300 sizeof(struct gfs2_meta_header)) 301 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 302 303 /* Compute maximum reservation required to add a entry to a directory */ 304 305 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 306 sdp->sd_jbsize); 307 308 ind_blocks = 0; 309 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 310 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 311 ind_blocks += tmp_blocks; 312 } 313 314 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 315 316 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 317 318 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 319 sizeof(struct gfs2_dinode); 320 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 321 for (x = 2;; x++) { 322 u64 space, d; 323 u32 m; 324 325 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 326 d = space; 327 m = do_div(d, sdp->sd_inptrs); 328 329 if (d != sdp->sd_heightsize[x - 1] || m) 330 break; 331 sdp->sd_heightsize[x] = space; 332 } 333 sdp->sd_max_height = x; 334 sdp->sd_heightsize[x] = ~0; 335 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 336 337 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize - 338 sizeof(struct gfs2_dinode); 339 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs; 340 for (x = 2;; x++) { 341 u64 space, d; 342 u32 m; 343 344 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs; 345 d = space; 346 m = do_div(d, sdp->sd_inptrs); 347 348 if (d != sdp->sd_jheightsize[x - 1] || m) 349 break; 350 sdp->sd_jheightsize[x] = space; 351 } 352 sdp->sd_max_jheight = x; 353 sdp->sd_jheightsize[x] = ~0; 354 gfs2_assert(sdp, sdp->sd_max_jheight <= 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 /* Set up the buffer cache and SB for real */ 494 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 495 ret = -EINVAL; 496 fs_err(sdp, "FS block size (%u) is too small for device " 497 "block size (%u)\n", 498 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 499 goto out; 500 } 501 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 502 ret = -EINVAL; 503 fs_err(sdp, "FS block size (%u) is too big for machine " 504 "page size (%u)\n", 505 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 506 goto out; 507 } 508 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 509 510 /* Get the root inode */ 511 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 512 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 513 if (ret) 514 goto out; 515 516 /* Get the master inode */ 517 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 518 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 519 if (ret) { 520 dput(sdp->sd_root_dir); 521 goto out; 522 } 523 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 524 out: 525 gfs2_glock_dq_uninit(&sb_gh); 526 return ret; 527 } 528 529 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 530 { 531 char *message = "FIRSTMOUNT=Done"; 532 char *envp[] = { message, NULL }; 533 534 fs_info(sdp, "first mount done, others may mount\n"); 535 536 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 537 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 538 539 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 540 } 541 542 /** 543 * gfs2_jindex_hold - Grab a lock on the jindex 544 * @sdp: The GFS2 superblock 545 * @ji_gh: the holder for the jindex glock 546 * 547 * Returns: errno 548 */ 549 550 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 551 { 552 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 553 struct qstr name; 554 char buf[20]; 555 struct gfs2_jdesc *jd; 556 int error; 557 558 name.name = buf; 559 560 mutex_lock(&sdp->sd_jindex_mutex); 561 562 for (;;) { 563 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 564 if (error) 565 break; 566 567 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 568 name.hash = gfs2_disk_hash(name.name, name.len); 569 570 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 571 if (error == -ENOENT) { 572 error = 0; 573 break; 574 } 575 576 gfs2_glock_dq_uninit(ji_gh); 577 578 if (error) 579 break; 580 581 error = -ENOMEM; 582 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 583 if (!jd) 584 break; 585 586 INIT_LIST_HEAD(&jd->extent_list); 587 INIT_LIST_HEAD(&jd->jd_revoke_list); 588 589 INIT_WORK(&jd->jd_work, gfs2_recover_func); 590 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 591 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { 592 if (!jd->jd_inode) 593 error = -ENOENT; 594 else 595 error = PTR_ERR(jd->jd_inode); 596 kfree(jd); 597 break; 598 } 599 600 spin_lock(&sdp->sd_jindex_spin); 601 jd->jd_jid = sdp->sd_journals++; 602 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 603 spin_unlock(&sdp->sd_jindex_spin); 604 } 605 606 mutex_unlock(&sdp->sd_jindex_mutex); 607 608 return error; 609 } 610 611 /** 612 * check_journal_clean - Make sure a journal is clean for a spectator mount 613 * @sdp: The GFS2 superblock 614 * @jd: The journal descriptor 615 * 616 * Returns: 0 if the journal is clean or locked, else an error 617 */ 618 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) 619 { 620 int error; 621 struct gfs2_holder j_gh; 622 struct gfs2_log_header_host head; 623 struct gfs2_inode *ip; 624 625 ip = GFS2_I(jd->jd_inode); 626 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | 627 GL_EXACT | GL_NOCACHE, &j_gh); 628 if (error) { 629 fs_err(sdp, "Error locking journal for spectator mount.\n"); 630 return -EPERM; 631 } 632 error = gfs2_jdesc_check(jd); 633 if (error) { 634 fs_err(sdp, "Error checking journal for spectator mount.\n"); 635 goto out_unlock; 636 } 637 error = gfs2_find_jhead(jd, &head); 638 if (error) { 639 fs_err(sdp, "Error parsing journal for spectator mount.\n"); 640 goto out_unlock; 641 } 642 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 643 error = -EPERM; 644 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " 645 "must not be a spectator.\n", jd->jd_jid); 646 } 647 648 out_unlock: 649 gfs2_glock_dq_uninit(&j_gh); 650 return error; 651 } 652 653 static int init_journal(struct gfs2_sbd *sdp, int undo) 654 { 655 struct inode *master = d_inode(sdp->sd_master_dir); 656 struct gfs2_holder ji_gh; 657 struct gfs2_inode *ip; 658 int jindex = 1; 659 int error = 0; 660 661 if (undo) { 662 jindex = 0; 663 goto fail_jinode_gh; 664 } 665 666 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 667 if (IS_ERR(sdp->sd_jindex)) { 668 fs_err(sdp, "can't lookup journal index: %d\n", error); 669 return PTR_ERR(sdp->sd_jindex); 670 } 671 672 /* Load in the journal index special file */ 673 674 error = gfs2_jindex_hold(sdp, &ji_gh); 675 if (error) { 676 fs_err(sdp, "can't read journal index: %d\n", error); 677 goto fail; 678 } 679 680 error = -EUSERS; 681 if (!gfs2_jindex_size(sdp)) { 682 fs_err(sdp, "no journals!\n"); 683 goto fail_jindex; 684 } 685 686 if (sdp->sd_args.ar_spectator) { 687 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 688 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 689 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 690 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 691 } else { 692 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 693 fs_err(sdp, "can't mount journal #%u\n", 694 sdp->sd_lockstruct.ls_jid); 695 fs_err(sdp, "there are only %u journals (0 - %u)\n", 696 gfs2_jindex_size(sdp), 697 gfs2_jindex_size(sdp) - 1); 698 goto fail_jindex; 699 } 700 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 701 702 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 703 &gfs2_journal_glops, 704 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, 705 &sdp->sd_journal_gh); 706 if (error) { 707 fs_err(sdp, "can't acquire journal glock: %d\n", error); 708 goto fail_jindex; 709 } 710 711 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 712 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 713 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 714 &sdp->sd_jinode_gh); 715 if (error) { 716 fs_err(sdp, "can't acquire journal inode glock: %d\n", 717 error); 718 goto fail_journal_gh; 719 } 720 721 error = gfs2_jdesc_check(sdp->sd_jdesc); 722 if (error) { 723 fs_err(sdp, "my journal (%u) is bad: %d\n", 724 sdp->sd_jdesc->jd_jid, error); 725 goto fail_jinode_gh; 726 } 727 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 728 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 729 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 730 731 /* Map the extents for this journal's blocks */ 732 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 733 } 734 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 735 736 if (sdp->sd_lockstruct.ls_first) { 737 unsigned int x; 738 for (x = 0; x < sdp->sd_journals; x++) { 739 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 740 741 if (sdp->sd_args.ar_spectator) { 742 error = check_journal_clean(sdp, jd); 743 if (error) 744 goto fail_jinode_gh; 745 continue; 746 } 747 error = gfs2_recover_journal(jd, true); 748 if (error) { 749 fs_err(sdp, "error recovering journal %u: %d\n", 750 x, error); 751 goto fail_jinode_gh; 752 } 753 } 754 755 gfs2_others_may_mount(sdp); 756 } else if (!sdp->sd_args.ar_spectator) { 757 error = gfs2_recover_journal(sdp->sd_jdesc, true); 758 if (error) { 759 fs_err(sdp, "error recovering my journal: %d\n", error); 760 goto fail_jinode_gh; 761 } 762 } 763 764 sdp->sd_log_idle = 1; 765 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 766 gfs2_glock_dq_uninit(&ji_gh); 767 jindex = 0; 768 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 769 return 0; 770 771 fail_jinode_gh: 772 if (!sdp->sd_args.ar_spectator) 773 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 774 fail_journal_gh: 775 if (!sdp->sd_args.ar_spectator) 776 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 777 fail_jindex: 778 gfs2_jindex_free(sdp); 779 if (jindex) 780 gfs2_glock_dq_uninit(&ji_gh); 781 fail: 782 iput(sdp->sd_jindex); 783 return error; 784 } 785 786 static struct lock_class_key gfs2_quota_imutex_key; 787 788 static int init_inodes(struct gfs2_sbd *sdp, int undo) 789 { 790 int error = 0; 791 struct inode *master = d_inode(sdp->sd_master_dir); 792 793 if (undo) 794 goto fail_qinode; 795 796 error = init_journal(sdp, undo); 797 complete_all(&sdp->sd_journal_ready); 798 if (error) 799 goto fail; 800 801 /* Read in the master statfs inode */ 802 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 803 if (IS_ERR(sdp->sd_statfs_inode)) { 804 error = PTR_ERR(sdp->sd_statfs_inode); 805 fs_err(sdp, "can't read in statfs inode: %d\n", error); 806 goto fail_journal; 807 } 808 809 /* Read in the resource index inode */ 810 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 811 if (IS_ERR(sdp->sd_rindex)) { 812 error = PTR_ERR(sdp->sd_rindex); 813 fs_err(sdp, "can't get resource index inode: %d\n", error); 814 goto fail_statfs; 815 } 816 sdp->sd_rindex_uptodate = 0; 817 818 /* Read in the quota inode */ 819 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 820 if (IS_ERR(sdp->sd_quota_inode)) { 821 error = PTR_ERR(sdp->sd_quota_inode); 822 fs_err(sdp, "can't get quota file inode: %d\n", error); 823 goto fail_rindex; 824 } 825 /* 826 * i_mutex on quota files is special. Since this inode is hidden system 827 * file, we are safe to define locking ourselves. 828 */ 829 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 830 &gfs2_quota_imutex_key); 831 832 error = gfs2_rindex_update(sdp); 833 if (error) 834 goto fail_qinode; 835 836 return 0; 837 838 fail_qinode: 839 iput(sdp->sd_quota_inode); 840 fail_rindex: 841 gfs2_clear_rgrpd(sdp); 842 iput(sdp->sd_rindex); 843 fail_statfs: 844 iput(sdp->sd_statfs_inode); 845 fail_journal: 846 init_journal(sdp, UNDO); 847 fail: 848 return error; 849 } 850 851 static int init_per_node(struct gfs2_sbd *sdp, int undo) 852 { 853 struct inode *pn = NULL; 854 char buf[30]; 855 int error = 0; 856 struct gfs2_inode *ip; 857 struct inode *master = d_inode(sdp->sd_master_dir); 858 859 if (sdp->sd_args.ar_spectator) 860 return 0; 861 862 if (undo) 863 goto fail_qc_gh; 864 865 pn = gfs2_lookup_simple(master, "per_node"); 866 if (IS_ERR(pn)) { 867 error = PTR_ERR(pn); 868 fs_err(sdp, "can't find per_node directory: %d\n", error); 869 return error; 870 } 871 872 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 873 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 874 if (IS_ERR(sdp->sd_sc_inode)) { 875 error = PTR_ERR(sdp->sd_sc_inode); 876 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 877 goto fail; 878 } 879 880 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 881 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 882 if (IS_ERR(sdp->sd_qc_inode)) { 883 error = PTR_ERR(sdp->sd_qc_inode); 884 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 885 goto fail_ut_i; 886 } 887 888 iput(pn); 889 pn = NULL; 890 891 ip = GFS2_I(sdp->sd_sc_inode); 892 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 893 &sdp->sd_sc_gh); 894 if (error) { 895 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 896 goto fail_qc_i; 897 } 898 899 ip = GFS2_I(sdp->sd_qc_inode); 900 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 901 &sdp->sd_qc_gh); 902 if (error) { 903 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 904 goto fail_ut_gh; 905 } 906 907 return 0; 908 909 fail_qc_gh: 910 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 911 fail_ut_gh: 912 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 913 fail_qc_i: 914 iput(sdp->sd_qc_inode); 915 fail_ut_i: 916 iput(sdp->sd_sc_inode); 917 fail: 918 iput(pn); 919 return error; 920 } 921 922 static const match_table_t nolock_tokens = { 923 { Opt_jid, "jid=%d\n", }, 924 { Opt_err, NULL }, 925 }; 926 927 static const struct lm_lockops nolock_ops = { 928 .lm_proto_name = "lock_nolock", 929 .lm_put_lock = gfs2_glock_free, 930 .lm_tokens = &nolock_tokens, 931 }; 932 933 /** 934 * gfs2_lm_mount - mount a locking protocol 935 * @sdp: the filesystem 936 * @args: mount arguments 937 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 938 * 939 * Returns: errno 940 */ 941 942 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 943 { 944 const struct lm_lockops *lm; 945 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 946 struct gfs2_args *args = &sdp->sd_args; 947 const char *proto = sdp->sd_proto_name; 948 const char *table = sdp->sd_table_name; 949 char *o, *options; 950 int ret; 951 952 if (!strcmp("lock_nolock", proto)) { 953 lm = &nolock_ops; 954 sdp->sd_args.ar_localflocks = 1; 955 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 956 } else if (!strcmp("lock_dlm", proto)) { 957 lm = &gfs2_dlm_ops; 958 #endif 959 } else { 960 pr_info("can't find protocol %s\n", proto); 961 return -ENOENT; 962 } 963 964 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 965 966 ls->ls_ops = lm; 967 ls->ls_first = 1; 968 969 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 970 substring_t tmp[MAX_OPT_ARGS]; 971 int token, option; 972 973 if (!o || !*o) 974 continue; 975 976 token = match_token(o, *lm->lm_tokens, tmp); 977 switch (token) { 978 case Opt_jid: 979 ret = match_int(&tmp[0], &option); 980 if (ret || option < 0) 981 goto hostdata_error; 982 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 983 ls->ls_jid = option; 984 break; 985 case Opt_id: 986 case Opt_nodir: 987 /* Obsolete, but left for backward compat purposes */ 988 break; 989 case Opt_first: 990 ret = match_int(&tmp[0], &option); 991 if (ret || (option != 0 && option != 1)) 992 goto hostdata_error; 993 ls->ls_first = option; 994 break; 995 case Opt_err: 996 default: 997 hostdata_error: 998 fs_info(sdp, "unknown hostdata (%s)\n", o); 999 return -EINVAL; 1000 } 1001 } 1002 1003 if (lm->lm_mount == NULL) { 1004 fs_info(sdp, "Now mounting FS...\n"); 1005 complete_all(&sdp->sd_locking_init); 1006 return 0; 1007 } 1008 ret = lm->lm_mount(sdp, table); 1009 if (ret == 0) 1010 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1011 complete_all(&sdp->sd_locking_init); 1012 return ret; 1013 } 1014 1015 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1016 { 1017 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1018 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && 1019 lm->lm_unmount) 1020 lm->lm_unmount(sdp); 1021 } 1022 1023 static int wait_on_journal(struct gfs2_sbd *sdp) 1024 { 1025 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1026 return 0; 1027 1028 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1029 ? -EINTR : 0; 1030 } 1031 1032 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1033 { 1034 struct super_block *sb = sdp->sd_vfs; 1035 char ro[20]; 1036 char spectator[20]; 1037 char *envp[] = { ro, spectator, NULL }; 1038 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 1039 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1040 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1041 } 1042 1043 /** 1044 * fill_super - Read in superblock 1045 * @sb: The VFS superblock 1046 * @data: Mount options 1047 * @silent: Don't complain if it's not a GFS2 filesystem 1048 * 1049 * Returns: errno 1050 */ 1051 1052 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent) 1053 { 1054 struct gfs2_sbd *sdp; 1055 struct gfs2_holder mount_gh; 1056 int error; 1057 1058 sdp = init_sbd(sb); 1059 if (!sdp) { 1060 pr_warn("can't alloc struct gfs2_sbd\n"); 1061 return -ENOMEM; 1062 } 1063 sdp->sd_args = *args; 1064 1065 if (sdp->sd_args.ar_spectator) { 1066 sb->s_flags |= MS_RDONLY; 1067 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1068 } 1069 if (sdp->sd_args.ar_posix_acl) 1070 sb->s_flags |= MS_POSIXACL; 1071 if (sdp->sd_args.ar_nobarrier) 1072 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1073 1074 sb->s_flags |= MS_NOSEC; 1075 sb->s_magic = GFS2_MAGIC; 1076 sb->s_op = &gfs2_super_ops; 1077 sb->s_d_op = &gfs2_dops; 1078 sb->s_export_op = &gfs2_export_ops; 1079 sb->s_xattr = gfs2_xattr_handlers; 1080 sb->s_qcop = &gfs2_quotactl_ops; 1081 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1082 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1083 sb->s_time_gran = 1; 1084 sb->s_maxbytes = MAX_LFS_FILESIZE; 1085 1086 /* Set up the buffer cache and fill in some fake block size values 1087 to allow us to read-in the on-disk superblock. */ 1088 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1089 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1090 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1091 GFS2_BASIC_BLOCK_SHIFT; 1092 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1093 1094 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1095 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1096 if (sdp->sd_args.ar_statfs_quantum) { 1097 sdp->sd_tune.gt_statfs_slow = 0; 1098 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1099 } else { 1100 sdp->sd_tune.gt_statfs_slow = 1; 1101 sdp->sd_tune.gt_statfs_quantum = 30; 1102 } 1103 1104 error = init_names(sdp, silent); 1105 if (error) { 1106 /* In this case, we haven't initialized sysfs, so we have to 1107 manually free the sdp. */ 1108 free_percpu(sdp->sd_lkstats); 1109 kfree(sdp); 1110 sb->s_fs_info = NULL; 1111 return error; 1112 } 1113 1114 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name); 1115 1116 error = gfs2_sys_fs_add(sdp); 1117 /* 1118 * If we hit an error here, gfs2_sys_fs_add will have called function 1119 * kobject_put which causes the sysfs usage count to go to zero, which 1120 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1121 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1122 * kobject_put to free sdp. 1123 */ 1124 if (error) 1125 return error; 1126 1127 gfs2_create_debugfs_file(sdp); 1128 1129 error = gfs2_lm_mount(sdp, silent); 1130 if (error) 1131 goto fail_debug; 1132 1133 error = init_locking(sdp, &mount_gh, DO); 1134 if (error) 1135 goto fail_lm; 1136 1137 error = init_sb(sdp, silent); 1138 if (error) 1139 goto fail_locking; 1140 1141 error = wait_on_journal(sdp); 1142 if (error) 1143 goto fail_sb; 1144 1145 /* 1146 * If user space has failed to join the cluster or some similar 1147 * failure has occurred, then the journal id will contain a 1148 * negative (error) number. This will then be returned to the 1149 * caller (of the mount syscall). We do this even for spectator 1150 * mounts (which just write a jid of 0 to indicate "ok" even though 1151 * the jid is unused in the spectator case) 1152 */ 1153 if (sdp->sd_lockstruct.ls_jid < 0) { 1154 error = sdp->sd_lockstruct.ls_jid; 1155 sdp->sd_lockstruct.ls_jid = 0; 1156 goto fail_sb; 1157 } 1158 1159 if (sdp->sd_args.ar_spectator) 1160 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", 1161 sdp->sd_table_name); 1162 else 1163 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", 1164 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1165 1166 error = init_inodes(sdp, DO); 1167 if (error) 1168 goto fail_sb; 1169 1170 error = init_per_node(sdp, DO); 1171 if (error) 1172 goto fail_inodes; 1173 1174 error = gfs2_statfs_init(sdp); 1175 if (error) { 1176 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1177 goto fail_per_node; 1178 } 1179 1180 if (!(sb->s_flags & MS_RDONLY)) { 1181 error = gfs2_make_fs_rw(sdp); 1182 if (error) { 1183 fs_err(sdp, "can't make FS RW: %d\n", error); 1184 goto fail_per_node; 1185 } 1186 } 1187 1188 gfs2_glock_dq_uninit(&mount_gh); 1189 gfs2_online_uevent(sdp); 1190 return 0; 1191 1192 fail_per_node: 1193 init_per_node(sdp, UNDO); 1194 fail_inodes: 1195 init_inodes(sdp, UNDO); 1196 fail_sb: 1197 if (sdp->sd_root_dir) 1198 dput(sdp->sd_root_dir); 1199 if (sdp->sd_master_dir) 1200 dput(sdp->sd_master_dir); 1201 if (sb->s_root) 1202 dput(sb->s_root); 1203 sb->s_root = NULL; 1204 fail_locking: 1205 init_locking(sdp, &mount_gh, UNDO); 1206 fail_lm: 1207 complete_all(&sdp->sd_journal_ready); 1208 gfs2_gl_hash_clear(sdp); 1209 gfs2_lm_unmount(sdp); 1210 fail_debug: 1211 gfs2_delete_debugfs_file(sdp); 1212 free_percpu(sdp->sd_lkstats); 1213 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1214 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1215 gfs2_sys_fs_del(sdp); 1216 sb->s_fs_info = NULL; 1217 return error; 1218 } 1219 1220 static int set_gfs2_super(struct super_block *s, void *data) 1221 { 1222 s->s_bdev = data; 1223 s->s_dev = s->s_bdev->bd_dev; 1224 1225 /* 1226 * We set the bdi here to the queue backing, file systems can 1227 * overwrite this in ->fill_super() 1228 */ 1229 s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info; 1230 return 0; 1231 } 1232 1233 static int test_gfs2_super(struct super_block *s, void *ptr) 1234 { 1235 struct block_device *bdev = ptr; 1236 return (bdev == s->s_bdev); 1237 } 1238 1239 /** 1240 * gfs2_mount - Get the GFS2 superblock 1241 * @fs_type: The GFS2 filesystem type 1242 * @flags: Mount flags 1243 * @dev_name: The name of the device 1244 * @data: The mount arguments 1245 * 1246 * Q. Why not use get_sb_bdev() ? 1247 * A. We need to select one of two root directories to mount, independent 1248 * of whether this is the initial, or subsequent, mount of this sb 1249 * 1250 * Returns: 0 or -ve on error 1251 */ 1252 1253 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags, 1254 const char *dev_name, void *data) 1255 { 1256 struct block_device *bdev; 1257 struct super_block *s; 1258 fmode_t mode = FMODE_READ | FMODE_EXCL; 1259 int error; 1260 struct gfs2_args args; 1261 struct gfs2_sbd *sdp; 1262 1263 if (!(flags & MS_RDONLY)) 1264 mode |= FMODE_WRITE; 1265 1266 bdev = blkdev_get_by_path(dev_name, mode, fs_type); 1267 if (IS_ERR(bdev)) 1268 return ERR_CAST(bdev); 1269 1270 /* 1271 * once the super is inserted into the list by sget, s_umount 1272 * will protect the lockfs code from trying to start a snapshot 1273 * while we are mounting 1274 */ 1275 mutex_lock(&bdev->bd_fsfreeze_mutex); 1276 if (bdev->bd_fsfreeze_count > 0) { 1277 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1278 error = -EBUSY; 1279 goto error_bdev; 1280 } 1281 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev); 1282 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1283 error = PTR_ERR(s); 1284 if (IS_ERR(s)) 1285 goto error_bdev; 1286 1287 if (s->s_root) { 1288 /* 1289 * s_umount nests inside bd_mutex during 1290 * __invalidate_device(). blkdev_put() acquires 1291 * bd_mutex and can't be called under s_umount. Drop 1292 * s_umount temporarily. This is safe as we're 1293 * holding an active reference. 1294 */ 1295 up_write(&s->s_umount); 1296 blkdev_put(bdev, mode); 1297 down_write(&s->s_umount); 1298 } else { 1299 /* s_mode must be set before deactivate_locked_super calls */ 1300 s->s_mode = mode; 1301 } 1302 1303 memset(&args, 0, sizeof(args)); 1304 args.ar_quota = GFS2_QUOTA_DEFAULT; 1305 args.ar_data = GFS2_DATA_DEFAULT; 1306 args.ar_commit = 30; 1307 args.ar_statfs_quantum = 30; 1308 args.ar_quota_quantum = 60; 1309 args.ar_errors = GFS2_ERRORS_DEFAULT; 1310 1311 error = gfs2_mount_args(&args, data); 1312 if (error) { 1313 pr_warn("can't parse mount arguments\n"); 1314 goto error_super; 1315 } 1316 1317 if (s->s_root) { 1318 error = -EBUSY; 1319 if ((flags ^ s->s_flags) & MS_RDONLY) 1320 goto error_super; 1321 } else { 1322 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 1323 sb_set_blocksize(s, block_size(bdev)); 1324 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0); 1325 if (error) 1326 goto error_super; 1327 s->s_flags |= MS_ACTIVE; 1328 bdev->bd_super = s; 1329 } 1330 1331 sdp = s->s_fs_info; 1332 if (args.ar_meta) 1333 return dget(sdp->sd_master_dir); 1334 else 1335 return dget(sdp->sd_root_dir); 1336 1337 error_super: 1338 deactivate_locked_super(s); 1339 return ERR_PTR(error); 1340 error_bdev: 1341 blkdev_put(bdev, mode); 1342 return ERR_PTR(error); 1343 } 1344 1345 static int set_meta_super(struct super_block *s, void *ptr) 1346 { 1347 return -EINVAL; 1348 } 1349 1350 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type, 1351 int flags, const char *dev_name, void *data) 1352 { 1353 struct super_block *s; 1354 struct gfs2_sbd *sdp; 1355 struct path path; 1356 int error; 1357 1358 error = kern_path(dev_name, LOOKUP_FOLLOW, &path); 1359 if (error) { 1360 pr_warn("path_lookup on %s returned error %d\n", 1361 dev_name, error); 1362 return ERR_PTR(error); 1363 } 1364 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags, 1365 path.dentry->d_sb->s_bdev); 1366 path_put(&path); 1367 if (IS_ERR(s)) { 1368 pr_warn("gfs2 mount does not exist\n"); 1369 return ERR_CAST(s); 1370 } 1371 if ((flags ^ s->s_flags) & MS_RDONLY) { 1372 deactivate_locked_super(s); 1373 return ERR_PTR(-EBUSY); 1374 } 1375 sdp = s->s_fs_info; 1376 return dget(sdp->sd_master_dir); 1377 } 1378 1379 static void gfs2_kill_sb(struct super_block *sb) 1380 { 1381 struct gfs2_sbd *sdp = sb->s_fs_info; 1382 1383 if (sdp == NULL) { 1384 kill_block_super(sb); 1385 return; 1386 } 1387 1388 gfs2_log_flush(sdp, NULL, SYNC_FLUSH); 1389 dput(sdp->sd_root_dir); 1390 dput(sdp->sd_master_dir); 1391 sdp->sd_root_dir = NULL; 1392 sdp->sd_master_dir = NULL; 1393 shrink_dcache_sb(sb); 1394 gfs2_delete_debugfs_file(sdp); 1395 free_percpu(sdp->sd_lkstats); 1396 kill_block_super(sb); 1397 } 1398 1399 struct file_system_type gfs2_fs_type = { 1400 .name = "gfs2", 1401 .fs_flags = FS_REQUIRES_DEV, 1402 .mount = gfs2_mount, 1403 .kill_sb = gfs2_kill_sb, 1404 .owner = THIS_MODULE, 1405 }; 1406 MODULE_ALIAS_FS("gfs2"); 1407 1408 struct file_system_type gfs2meta_fs_type = { 1409 .name = "gfs2meta", 1410 .fs_flags = FS_REQUIRES_DEV, 1411 .mount = gfs2_mount_meta, 1412 .owner = THIS_MODULE, 1413 }; 1414 MODULE_ALIAS_FS("gfs2meta"); 1415