/fs/gfs2/ops_fstype.c
C | 1435 lines | 1081 code | 208 blank | 146 comment | 161 complexity | bc69232037900be5d940654441bd9e5b MD5 | raw file
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#include <linux/sched.h> 11#include <linux/slab.h> 12#include <linux/spinlock.h> 13#include <linux/completion.h> 14#include <linux/buffer_head.h> 15#include <linux/blkdev.h> 16#include <linux/kthread.h> 17#include <linux/export.h> 18#include <linux/namei.h> 19#include <linux/mount.h> 20#include <linux/gfs2_ondisk.h> 21#include <linux/quotaops.h> 22#include <linux/lockdep.h> 23 24#include "gfs2.h" 25#include "incore.h" 26#include "bmap.h" 27#include "glock.h" 28#include "glops.h" 29#include "inode.h" 30#include "recovery.h" 31#include "rgrp.h" 32#include "super.h" 33#include "sys.h" 34#include "util.h" 35#include "log.h" 36#include "quota.h" 37#include "dir.h" 38#include "trace_gfs2.h" 39 40#define DO 0 41#define UNDO 1 42 43/** 44 * gfs2_tune_init - Fill a gfs2_tune structure with default values 45 * @gt: tune 46 * 47 */ 48 49static void gfs2_tune_init(struct gfs2_tune *gt) 50{ 51 spin_lock_init(>->gt_spin); 52 53 gt->gt_quota_simul_sync = 64; 54 gt->gt_quota_warn_period = 10; 55 gt->gt_quota_scale_num = 1; 56 gt->gt_quota_scale_den = 1; 57 gt->gt_new_files_jdata = 0; 58 gt->gt_max_readahead = 1 << 18; 59 gt->gt_complain_secs = 10; 60} 61 62static struct gfs2_sbd *init_sbd(struct super_block *sb) 63{ 64 struct gfs2_sbd *sdp; 65 66 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); 67 if (!sdp) 68 return NULL; 69 70 sb->s_fs_info = sdp; 71 sdp->sd_vfs = sb; 72 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats); 73 if (!sdp->sd_lkstats) { 74 kfree(sdp); 75 return NULL; 76 } 77 78 set_bit(SDF_NOJOURNALID, &sdp->sd_flags); 79 gfs2_tune_init(&sdp->sd_tune); 80 81 init_waitqueue_head(&sdp->sd_glock_wait); 82 atomic_set(&sdp->sd_glock_disposal, 0); 83 init_completion(&sdp->sd_locking_init); 84 init_completion(&sdp->sd_wdack); 85 spin_lock_init(&sdp->sd_statfs_spin); 86 87 spin_lock_init(&sdp->sd_rindex_spin); 88 sdp->sd_rindex_tree.rb_node = NULL; 89 90 INIT_LIST_HEAD(&sdp->sd_jindex_list); 91 spin_lock_init(&sdp->sd_jindex_spin); 92 mutex_init(&sdp->sd_jindex_mutex); 93 94 INIT_LIST_HEAD(&sdp->sd_quota_list); 95 mutex_init(&sdp->sd_quota_mutex); 96 init_waitqueue_head(&sdp->sd_quota_wait); 97 INIT_LIST_HEAD(&sdp->sd_trunc_list); 98 spin_lock_init(&sdp->sd_trunc_lock); 99 100 spin_lock_init(&sdp->sd_log_lock); 101 atomic_set(&sdp->sd_log_pinned, 0); 102 INIT_LIST_HEAD(&sdp->sd_log_le_buf); 103 INIT_LIST_HEAD(&sdp->sd_log_le_revoke); 104 INIT_LIST_HEAD(&sdp->sd_log_le_databuf); 105 INIT_LIST_HEAD(&sdp->sd_log_le_ordered); 106 spin_lock_init(&sdp->sd_ordered_lock); 107 108 init_waitqueue_head(&sdp->sd_log_waitq); 109 init_waitqueue_head(&sdp->sd_logd_waitq); 110 spin_lock_init(&sdp->sd_ail_lock); 111 INIT_LIST_HEAD(&sdp->sd_ail1_list); 112 INIT_LIST_HEAD(&sdp->sd_ail2_list); 113 114 init_rwsem(&sdp->sd_log_flush_lock); 115 atomic_set(&sdp->sd_log_in_flight, 0); 116 init_waitqueue_head(&sdp->sd_log_flush_wait); 117 118 INIT_LIST_HEAD(&sdp->sd_revoke_list); 119 120 return sdp; 121} 122 123 124/** 125 * gfs2_check_sb - Check superblock 126 * @sdp: the filesystem 127 * @sb: The superblock 128 * @silent: Don't print a message if the check fails 129 * 130 * Checks the version code of the FS is one that we understand how to 131 * read and that the sizes of the various on-disk structures have not 132 * changed. 133 */ 134 135static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 136{ 137 struct gfs2_sb_host *sb = &sdp->sd_sb; 138 139 if (sb->sb_magic != GFS2_MAGIC || 140 sb->sb_type != GFS2_METATYPE_SB) { 141 if (!silent) 142 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n"); 143 return -EINVAL; 144 } 145 146 /* If format numbers match exactly, we're done. */ 147 148 if (sb->sb_fs_format == GFS2_FORMAT_FS && 149 sb->sb_multihost_format == GFS2_FORMAT_MULTI) 150 return 0; 151 152 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 153 154 return -EINVAL; 155} 156 157static void end_bio_io_page(struct bio *bio, int error) 158{ 159 struct page *page = bio->bi_private; 160 161 if (!error) 162 SetPageUptodate(page); 163 else 164 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error); 165 unlock_page(page); 166} 167 168static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 169{ 170 struct gfs2_sb_host *sb = &sdp->sd_sb; 171 struct super_block *s = sdp->sd_vfs; 172 const struct gfs2_sb *str = buf; 173 174 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 175 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 176 sb->sb_format = be32_to_cpu(str->sb_header.mh_format); 177 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 178 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 179 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 180 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 181 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 182 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 183 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 184 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 185 186 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 187 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 188 memcpy(s->s_uuid, str->sb_uuid, 16); 189} 190 191/** 192 * gfs2_read_super - Read the gfs2 super block from disk 193 * @sdp: The GFS2 super block 194 * @sector: The location of the super block 195 * @error: The error code to return 196 * 197 * This uses the bio functions to read the super block from disk 198 * because we want to be 100% sure that we never read cached data. 199 * A super block is read twice only during each GFS2 mount and is 200 * never written to by the filesystem. The first time its read no 201 * locks are held, and the only details which are looked at are those 202 * relating to the locking protocol. Once locking is up and working, 203 * the sb is read again under the lock to establish the location of 204 * the master directory (contains pointers to journals etc) and the 205 * root directory. 206 * 207 * Returns: 0 on success or error 208 */ 209 210static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 211{ 212 struct super_block *sb = sdp->sd_vfs; 213 struct gfs2_sb *p; 214 struct page *page; 215 struct bio *bio; 216 217 page = alloc_page(GFP_NOFS); 218 if (unlikely(!page)) 219 return -ENOBUFS; 220 221 ClearPageUptodate(page); 222 ClearPageDirty(page); 223 lock_page(page); 224 225 bio = bio_alloc(GFP_NOFS, 1); 226 bio->bi_sector = sector * (sb->s_blocksize >> 9); 227 bio->bi_bdev = sb->s_bdev; 228 bio_add_page(bio, page, PAGE_SIZE, 0); 229 230 bio->bi_end_io = end_bio_io_page; 231 bio->bi_private = page; 232 submit_bio(READ_SYNC | REQ_META, bio); 233 wait_on_page_locked(page); 234 bio_put(bio); 235 if (!PageUptodate(page)) { 236 __free_page(page); 237 return -EIO; 238 } 239 p = kmap(page); 240 gfs2_sb_in(sdp, p); 241 kunmap(page); 242 __free_page(page); 243 return gfs2_check_sb(sdp, silent); 244} 245 246/** 247 * gfs2_read_sb - Read super block 248 * @sdp: The GFS2 superblock 249 * @silent: Don't print message if mount fails 250 * 251 */ 252 253static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 254{ 255 u32 hash_blocks, ind_blocks, leaf_blocks; 256 u32 tmp_blocks; 257 unsigned int x; 258 int error; 259 260 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 261 if (error) { 262 if (!silent) 263 fs_err(sdp, "can't read superblock\n"); 264 return error; 265 } 266 267 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 268 GFS2_BASIC_BLOCK_SHIFT; 269 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; 270 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 271 sizeof(struct gfs2_dinode)) / sizeof(u64); 272 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 273 sizeof(struct gfs2_meta_header)) / sizeof(u64); 274 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 275 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 276 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 277 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 278 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 279 sizeof(struct gfs2_meta_header)) / 280 sizeof(struct gfs2_quota_change); 281 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 282 sizeof(struct gfs2_meta_header)) 283 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 284 285 /* Compute maximum reservation required to add a entry to a directory */ 286 287 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH), 288 sdp->sd_jbsize); 289 290 ind_blocks = 0; 291 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 292 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 293 ind_blocks += tmp_blocks; 294 } 295 296 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 297 298 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 299 300 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 301 sizeof(struct gfs2_dinode); 302 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 303 for (x = 2;; x++) { 304 u64 space, d; 305 u32 m; 306 307 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 308 d = space; 309 m = do_div(d, sdp->sd_inptrs); 310 311 if (d != sdp->sd_heightsize[x - 1] || m) 312 break; 313 sdp->sd_heightsize[x] = space; 314 } 315 sdp->sd_max_height = x; 316 sdp->sd_heightsize[x] = ~0; 317 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 318 319 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize - 320 sizeof(struct gfs2_dinode); 321 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs; 322 for (x = 2;; x++) { 323 u64 space, d; 324 u32 m; 325 326 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs; 327 d = space; 328 m = do_div(d, sdp->sd_inptrs); 329 330 if (d != sdp->sd_jheightsize[x - 1] || m) 331 break; 332 sdp->sd_jheightsize[x] = space; 333 } 334 sdp->sd_max_jheight = x; 335 sdp->sd_jheightsize[x] = ~0; 336 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT); 337 338 return 0; 339} 340 341static int init_names(struct gfs2_sbd *sdp, int silent) 342{ 343 char *proto, *table; 344 int error = 0; 345 346 proto = sdp->sd_args.ar_lockproto; 347 table = sdp->sd_args.ar_locktable; 348 349 /* Try to autodetect */ 350 351 if (!proto[0] || !table[0]) { 352 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 353 if (error) 354 return error; 355 356 if (!proto[0]) 357 proto = sdp->sd_sb.sb_lockproto; 358 if (!table[0]) 359 table = sdp->sd_sb.sb_locktable; 360 } 361 362 if (!table[0]) 363 table = sdp->sd_vfs->s_id; 364 365 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 366 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 367 368 table = sdp->sd_table_name; 369 while ((table = strchr(table, '/'))) 370 *table = '_'; 371 372 return error; 373} 374 375static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 376 int undo) 377{ 378 int error = 0; 379 380 if (undo) 381 goto fail_trans; 382 383 error = gfs2_glock_nq_num(sdp, 384 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 385 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 386 mount_gh); 387 if (error) { 388 fs_err(sdp, "can't acquire mount glock: %d\n", error); 389 goto fail; 390 } 391 392 error = gfs2_glock_nq_num(sdp, 393 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 394 LM_ST_SHARED, 395 LM_FLAG_NOEXP | GL_EXACT, 396 &sdp->sd_live_gh); 397 if (error) { 398 fs_err(sdp, "can't acquire live glock: %d\n", error); 399 goto fail_mount; 400 } 401 402 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 403 CREATE, &sdp->sd_rename_gl); 404 if (error) { 405 fs_err(sdp, "can't create rename glock: %d\n", error); 406 goto fail_live; 407 } 408 409 error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops, 410 CREATE, &sdp->sd_trans_gl); 411 if (error) { 412 fs_err(sdp, "can't create transaction glock: %d\n", error); 413 goto fail_rename; 414 } 415 416 return 0; 417 418fail_trans: 419 gfs2_glock_put(sdp->sd_trans_gl); 420fail_rename: 421 gfs2_glock_put(sdp->sd_rename_gl); 422fail_live: 423 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 424fail_mount: 425 gfs2_glock_dq_uninit(mount_gh); 426fail: 427 return error; 428} 429 430static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 431 u64 no_addr, const char *name) 432{ 433 struct gfs2_sbd *sdp = sb->s_fs_info; 434 struct dentry *dentry; 435 struct inode *inode; 436 437 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0); 438 if (IS_ERR(inode)) { 439 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 440 return PTR_ERR(inode); 441 } 442 dentry = d_make_root(inode); 443 if (!dentry) { 444 fs_err(sdp, "can't alloc %s dentry\n", name); 445 return -ENOMEM; 446 } 447 *dptr = dentry; 448 return 0; 449} 450 451static int init_sb(struct gfs2_sbd *sdp, int silent) 452{ 453 struct super_block *sb = sdp->sd_vfs; 454 struct gfs2_holder sb_gh; 455 u64 no_addr; 456 int ret; 457 458 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 459 LM_ST_SHARED, 0, &sb_gh); 460 if (ret) { 461 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 462 return ret; 463 } 464 465 ret = gfs2_read_sb(sdp, silent); 466 if (ret) { 467 fs_err(sdp, "can't read superblock: %d\n", ret); 468 goto out; 469 } 470 471 /* Set up the buffer cache and SB for real */ 472 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 473 ret = -EINVAL; 474 fs_err(sdp, "FS block size (%u) is too small for device " 475 "block size (%u)\n", 476 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 477 goto out; 478 } 479 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 480 ret = -EINVAL; 481 fs_err(sdp, "FS block size (%u) is too big for machine " 482 "page size (%u)\n", 483 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 484 goto out; 485 } 486 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 487 488 /* Get the root inode */ 489 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 490 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 491 if (ret) 492 goto out; 493 494 /* Get the master inode */ 495 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 496 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 497 if (ret) { 498 dput(sdp->sd_root_dir); 499 goto out; 500 } 501 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 502out: 503 gfs2_glock_dq_uninit(&sb_gh); 504 return ret; 505} 506 507/** 508 * map_journal_extents - create a reusable "extent" mapping from all logical 509 * blocks to all physical blocks for the given journal. This will save 510 * us time when writing journal blocks. Most journals will have only one 511 * extent that maps all their logical blocks. That's because gfs2.mkfs 512 * arranges the journal blocks sequentially to maximize performance. 513 * So the extent would map the first block for the entire file length. 514 * However, gfs2_jadd can happen while file activity is happening, so 515 * those journals may not be sequential. Less likely is the case where 516 * the users created their own journals by mounting the metafs and 517 * laying it out. But it's still possible. These journals might have 518 * several extents. 519 * 520 * TODO: This should be done in bigger chunks rather than one block at a time, 521 * but since it's only done at mount time, I'm not worried about the 522 * time it takes. 523 */ 524static int map_journal_extents(struct gfs2_sbd *sdp) 525{ 526 struct gfs2_jdesc *jd = sdp->sd_jdesc; 527 unsigned int lb; 528 u64 db, prev_db; /* logical block, disk block, prev disk block */ 529 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 530 struct gfs2_journal_extent *jext = NULL; 531 struct buffer_head bh; 532 int rc = 0; 533 534 prev_db = 0; 535 536 for (lb = 0; lb < i_size_read(jd->jd_inode) >> sdp->sd_sb.sb_bsize_shift; lb++) { 537 bh.b_state = 0; 538 bh.b_blocknr = 0; 539 bh.b_size = 1 << ip->i_inode.i_blkbits; 540 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0); 541 db = bh.b_blocknr; 542 if (rc || !db) { 543 printk(KERN_INFO "GFS2 journal mapping error %d: lb=" 544 "%u db=%llu\n", rc, lb, (unsigned long long)db); 545 break; 546 } 547 if (!prev_db || db != prev_db + 1) { 548 jext = kzalloc(sizeof(struct gfs2_journal_extent), 549 GFP_KERNEL); 550 if (!jext) { 551 printk(KERN_INFO "GFS2 error: out of memory " 552 "mapping journal extents.\n"); 553 rc = -ENOMEM; 554 break; 555 } 556 jext->dblock = db; 557 jext->lblock = lb; 558 jext->blocks = 1; 559 list_add_tail(&jext->extent_list, &jd->extent_list); 560 } else { 561 jext->blocks++; 562 } 563 prev_db = db; 564 } 565 return rc; 566} 567 568static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 569{ 570 char *message = "FIRSTMOUNT=Done"; 571 char *envp[] = { message, NULL }; 572 573 fs_info(sdp, "first mount done, others may mount\n"); 574 575 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 576 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 577 578 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 579} 580 581/** 582 * gfs2_jindex_hold - Grab a lock on the jindex 583 * @sdp: The GFS2 superblock 584 * @ji_gh: the holder for the jindex glock 585 * 586 * Returns: errno 587 */ 588 589static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 590{ 591 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 592 struct qstr name; 593 char buf[20]; 594 struct gfs2_jdesc *jd; 595 int error; 596 597 name.name = buf; 598 599 mutex_lock(&sdp->sd_jindex_mutex); 600 601 for (;;) { 602 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 603 if (error) 604 break; 605 606 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 607 name.hash = gfs2_disk_hash(name.name, name.len); 608 609 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 610 if (error == -ENOENT) { 611 error = 0; 612 break; 613 } 614 615 gfs2_glock_dq_uninit(ji_gh); 616 617 if (error) 618 break; 619 620 error = -ENOMEM; 621 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 622 if (!jd) 623 break; 624 625 INIT_LIST_HEAD(&jd->extent_list); 626 INIT_WORK(&jd->jd_work, gfs2_recover_func); 627 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 628 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { 629 if (!jd->jd_inode) 630 error = -ENOENT; 631 else 632 error = PTR_ERR(jd->jd_inode); 633 kfree(jd); 634 break; 635 } 636 637 spin_lock(&sdp->sd_jindex_spin); 638 jd->jd_jid = sdp->sd_journals++; 639 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 640 spin_unlock(&sdp->sd_jindex_spin); 641 } 642 643 mutex_unlock(&sdp->sd_jindex_mutex); 644 645 return error; 646} 647 648static int init_journal(struct gfs2_sbd *sdp, int undo) 649{ 650 struct inode *master = sdp->sd_master_dir->d_inode; 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 map_journal_extents(sdp); 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 error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x), 735 true); 736 if (error) { 737 fs_err(sdp, "error recovering journal %u: %d\n", 738 x, error); 739 goto fail_jinode_gh; 740 } 741 } 742 743 gfs2_others_may_mount(sdp); 744 } else if (!sdp->sd_args.ar_spectator) { 745 error = gfs2_recover_journal(sdp->sd_jdesc, true); 746 if (error) { 747 fs_err(sdp, "error recovering my journal: %d\n", error); 748 goto fail_jinode_gh; 749 } 750 } 751 752 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 753 gfs2_glock_dq_uninit(&ji_gh); 754 jindex = 0; 755 756 return 0; 757 758fail_jinode_gh: 759 if (!sdp->sd_args.ar_spectator) 760 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 761fail_journal_gh: 762 if (!sdp->sd_args.ar_spectator) 763 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 764fail_jindex: 765 gfs2_jindex_free(sdp); 766 if (jindex) 767 gfs2_glock_dq_uninit(&ji_gh); 768fail: 769 iput(sdp->sd_jindex); 770 return error; 771} 772 773static struct lock_class_key gfs2_quota_imutex_key; 774 775static int init_inodes(struct gfs2_sbd *sdp, int undo) 776{ 777 int error = 0; 778 struct inode *master = sdp->sd_master_dir->d_inode; 779 780 if (undo) 781 goto fail_qinode; 782 783 error = init_journal(sdp, undo); 784 if (error) 785 goto fail; 786 787 /* Read in the master statfs inode */ 788 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 789 if (IS_ERR(sdp->sd_statfs_inode)) { 790 error = PTR_ERR(sdp->sd_statfs_inode); 791 fs_err(sdp, "can't read in statfs inode: %d\n", error); 792 goto fail_journal; 793 } 794 795 /* Read in the resource index inode */ 796 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 797 if (IS_ERR(sdp->sd_rindex)) { 798 error = PTR_ERR(sdp->sd_rindex); 799 fs_err(sdp, "can't get resource index inode: %d\n", error); 800 goto fail_statfs; 801 } 802 sdp->sd_rindex_uptodate = 0; 803 804 /* Read in the quota inode */ 805 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 806 if (IS_ERR(sdp->sd_quota_inode)) { 807 error = PTR_ERR(sdp->sd_quota_inode); 808 fs_err(sdp, "can't get quota file inode: %d\n", error); 809 goto fail_rindex; 810 } 811 /* 812 * i_mutex on quota files is special. Since this inode is hidden system 813 * file, we are safe to define locking ourselves. 814 */ 815 lockdep_set_class(&sdp->sd_quota_inode->i_mutex, 816 &gfs2_quota_imutex_key); 817 818 error = gfs2_rindex_update(sdp); 819 if (error) 820 goto fail_qinode; 821 822 return 0; 823 824fail_qinode: 825 iput(sdp->sd_quota_inode); 826fail_rindex: 827 gfs2_clear_rgrpd(sdp); 828 iput(sdp->sd_rindex); 829fail_statfs: 830 iput(sdp->sd_statfs_inode); 831fail_journal: 832 init_journal(sdp, UNDO); 833fail: 834 return error; 835} 836 837static int init_per_node(struct gfs2_sbd *sdp, int undo) 838{ 839 struct inode *pn = NULL; 840 char buf[30]; 841 int error = 0; 842 struct gfs2_inode *ip; 843 struct inode *master = sdp->sd_master_dir->d_inode; 844 845 if (sdp->sd_args.ar_spectator) 846 return 0; 847 848 if (undo) 849 goto fail_qc_gh; 850 851 pn = gfs2_lookup_simple(master, "per_node"); 852 if (IS_ERR(pn)) { 853 error = PTR_ERR(pn); 854 fs_err(sdp, "can't find per_node directory: %d\n", error); 855 return error; 856 } 857 858 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 859 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 860 if (IS_ERR(sdp->sd_sc_inode)) { 861 error = PTR_ERR(sdp->sd_sc_inode); 862 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 863 goto fail; 864 } 865 866 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 867 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 868 if (IS_ERR(sdp->sd_qc_inode)) { 869 error = PTR_ERR(sdp->sd_qc_inode); 870 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 871 goto fail_ut_i; 872 } 873 874 iput(pn); 875 pn = NULL; 876 877 ip = GFS2_I(sdp->sd_sc_inode); 878 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 879 &sdp->sd_sc_gh); 880 if (error) { 881 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 882 goto fail_qc_i; 883 } 884 885 ip = GFS2_I(sdp->sd_qc_inode); 886 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 887 &sdp->sd_qc_gh); 888 if (error) { 889 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 890 goto fail_ut_gh; 891 } 892 893 return 0; 894 895fail_qc_gh: 896 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 897fail_ut_gh: 898 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 899fail_qc_i: 900 iput(sdp->sd_qc_inode); 901fail_ut_i: 902 iput(sdp->sd_sc_inode); 903fail: 904 if (pn) 905 iput(pn); 906 return error; 907} 908 909static int init_threads(struct gfs2_sbd *sdp, int undo) 910{ 911 struct task_struct *p; 912 int error = 0; 913 914 if (undo) 915 goto fail_quotad; 916 917 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 918 error = IS_ERR(p); 919 if (error) { 920 fs_err(sdp, "can't start logd thread: %d\n", error); 921 return error; 922 } 923 sdp->sd_logd_process = p; 924 925 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 926 error = IS_ERR(p); 927 if (error) { 928 fs_err(sdp, "can't start quotad thread: %d\n", error); 929 goto fail; 930 } 931 sdp->sd_quotad_process = p; 932 933 return 0; 934 935 936fail_quotad: 937 kthread_stop(sdp->sd_quotad_process); 938fail: 939 kthread_stop(sdp->sd_logd_process); 940 return error; 941} 942 943static const match_table_t nolock_tokens = { 944 { Opt_jid, "jid=%d\n", }, 945 { Opt_err, NULL }, 946}; 947 948static const struct lm_lockops nolock_ops = { 949 .lm_proto_name = "lock_nolock", 950 .lm_put_lock = gfs2_glock_free, 951 .lm_tokens = &nolock_tokens, 952}; 953 954/** 955 * gfs2_lm_mount - mount a locking protocol 956 * @sdp: the filesystem 957 * @args: mount arguments 958 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 959 * 960 * Returns: errno 961 */ 962 963static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 964{ 965 const struct lm_lockops *lm; 966 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 967 struct gfs2_args *args = &sdp->sd_args; 968 const char *proto = sdp->sd_proto_name; 969 const char *table = sdp->sd_table_name; 970 char *o, *options; 971 int ret; 972 973 if (!strcmp("lock_nolock", proto)) { 974 lm = &nolock_ops; 975 sdp->sd_args.ar_localflocks = 1; 976#ifdef CONFIG_GFS2_FS_LOCKING_DLM 977 } else if (!strcmp("lock_dlm", proto)) { 978 lm = &gfs2_dlm_ops; 979#endif 980 } else { 981 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto); 982 return -ENOENT; 983 } 984 985 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 986 987 ls->ls_ops = lm; 988 ls->ls_first = 1; 989 990 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 991 substring_t tmp[MAX_OPT_ARGS]; 992 int token, option; 993 994 if (!o || !*o) 995 continue; 996 997 token = match_token(o, *lm->lm_tokens, tmp); 998 switch (token) { 999 case Opt_jid: 1000 ret = match_int(&tmp[0], &option); 1001 if (ret || option < 0) 1002 goto hostdata_error; 1003 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 1004 ls->ls_jid = option; 1005 break; 1006 case Opt_id: 1007 case Opt_nodir: 1008 /* Obsolete, but left for backward compat purposes */ 1009 break; 1010 case Opt_first: 1011 ret = match_int(&tmp[0], &option); 1012 if (ret || (option != 0 && option != 1)) 1013 goto hostdata_error; 1014 ls->ls_first = option; 1015 break; 1016 case Opt_err: 1017 default: 1018hostdata_error: 1019 fs_info(sdp, "unknown hostdata (%s)\n", o); 1020 return -EINVAL; 1021 } 1022 } 1023 1024 if (lm->lm_mount == NULL) { 1025 fs_info(sdp, "Now mounting FS...\n"); 1026 complete_all(&sdp->sd_locking_init); 1027 return 0; 1028 } 1029 ret = lm->lm_mount(sdp, table); 1030 if (ret == 0) 1031 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1032 complete_all(&sdp->sd_locking_init); 1033 return ret; 1034} 1035 1036void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1037{ 1038 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1039 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && 1040 lm->lm_unmount) 1041 lm->lm_unmount(sdp); 1042} 1043 1044static int gfs2_journalid_wait(void *word) 1045{ 1046 if (signal_pending(current)) 1047 return -EINTR; 1048 schedule(); 1049 return 0; 1050} 1051 1052static int wait_on_journal(struct gfs2_sbd *sdp) 1053{ 1054 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1055 return 0; 1056 1057 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE); 1058} 1059 1060void gfs2_online_uevent(struct gfs2_sbd *sdp) 1061{ 1062 struct super_block *sb = sdp->sd_vfs; 1063 char ro[20]; 1064 char spectator[20]; 1065 char *envp[] = { ro, spectator, NULL }; 1066 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 1067 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1068 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1069} 1070 1071/** 1072 * fill_super - Read in superblock 1073 * @sb: The VFS superblock 1074 * @data: Mount options 1075 * @silent: Don't complain if it's not a GFS2 filesystem 1076 * 1077 * Returns: errno 1078 */ 1079 1080static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent) 1081{ 1082 struct gfs2_sbd *sdp; 1083 struct gfs2_holder mount_gh; 1084 int error; 1085 1086 sdp = init_sbd(sb); 1087 if (!sdp) { 1088 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n"); 1089 return -ENOMEM; 1090 } 1091 sdp->sd_args = *args; 1092 1093 if (sdp->sd_args.ar_spectator) { 1094 sb->s_flags |= MS_RDONLY; 1095 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1096 } 1097 if (sdp->sd_args.ar_posix_acl) 1098 sb->s_flags |= MS_POSIXACL; 1099 if (sdp->sd_args.ar_nobarrier) 1100 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1101 1102 sb->s_flags |= MS_NOSEC; 1103 sb->s_magic = GFS2_MAGIC; 1104 sb->s_op = &gfs2_super_ops; 1105 sb->s_d_op = &gfs2_dops; 1106 sb->s_export_op = &gfs2_export_ops; 1107 sb->s_xattr = gfs2_xattr_handlers; 1108 sb->s_qcop = &gfs2_quotactl_ops; 1109 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1110 sb->s_time_gran = 1; 1111 sb->s_maxbytes = MAX_LFS_FILESIZE; 1112 1113 /* Set up the buffer cache and fill in some fake block size values 1114 to allow us to read-in the on-disk superblock. */ 1115 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1116 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1117 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1118 GFS2_BASIC_BLOCK_SHIFT; 1119 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; 1120 1121 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1122 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1123 if (sdp->sd_args.ar_statfs_quantum) { 1124 sdp->sd_tune.gt_statfs_slow = 0; 1125 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1126 } else { 1127 sdp->sd_tune.gt_statfs_slow = 1; 1128 sdp->sd_tune.gt_statfs_quantum = 30; 1129 } 1130 1131 error = init_names(sdp, silent); 1132 if (error) { 1133 /* In this case, we haven't initialized sysfs, so we have to 1134 manually free the sdp. */ 1135 free_percpu(sdp->sd_lkstats); 1136 kfree(sdp); 1137 sb->s_fs_info = NULL; 1138 return error; 1139 } 1140 1141 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name); 1142 1143 error = gfs2_sys_fs_add(sdp); 1144 /* 1145 * If we hit an error here, gfs2_sys_fs_add will have called function 1146 * kobject_put which causes the sysfs usage count to go to zero, which 1147 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1148 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1149 * kobject_put to free sdp. 1150 */ 1151 if (error) 1152 return error; 1153 1154 gfs2_create_debugfs_file(sdp); 1155 1156 error = gfs2_lm_mount(sdp, silent); 1157 if (error) 1158 goto fail_debug; 1159 1160 error = init_locking(sdp, &mount_gh, DO); 1161 if (error) 1162 goto fail_lm; 1163 1164 error = init_sb(sdp, silent); 1165 if (error) 1166 goto fail_locking; 1167 1168 error = wait_on_journal(sdp); 1169 if (error) 1170 goto fail_sb; 1171 1172 /* 1173 * If user space has failed to join the cluster or some similar 1174 * failure has occurred, then the journal id will contain a 1175 * negative (error) number. This will then be returned to the 1176 * caller (of the mount syscall). We do this even for spectator 1177 * mounts (which just write a jid of 0 to indicate "ok" even though 1178 * the jid is unused in the spectator case) 1179 */ 1180 if (sdp->sd_lockstruct.ls_jid < 0) { 1181 error = sdp->sd_lockstruct.ls_jid; 1182 sdp->sd_lockstruct.ls_jid = 0; 1183 goto fail_sb; 1184 } 1185 1186 if (sdp->sd_args.ar_spectator) 1187 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", 1188 sdp->sd_table_name); 1189 else 1190 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", 1191 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1192 1193 error = init_inodes(sdp, DO); 1194 if (error) 1195 goto fail_sb; 1196 1197 error = init_per_node(sdp, DO); 1198 if (error) 1199 goto fail_inodes; 1200 1201 error = gfs2_statfs_init(sdp); 1202 if (error) { 1203 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1204 goto fail_per_node; 1205 } 1206 1207 error = init_threads(sdp, DO); 1208 if (error) 1209 goto fail_per_node; 1210 1211 if (!(sb->s_flags & MS_RDONLY)) { 1212 error = gfs2_make_fs_rw(sdp); 1213 if (error) { 1214 fs_err(sdp, "can't make FS RW: %d\n", error); 1215 goto fail_threads; 1216 } 1217 } 1218 1219 gfs2_glock_dq_uninit(&mount_gh); 1220 gfs2_online_uevent(sdp); 1221 return 0; 1222 1223fail_threads: 1224 init_threads(sdp, UNDO); 1225fail_per_node: 1226 init_per_node(sdp, UNDO); 1227fail_inodes: 1228 init_inodes(sdp, UNDO); 1229fail_sb: 1230 if (sdp->sd_root_dir) 1231 dput(sdp->sd_root_dir); 1232 if (sdp->sd_master_dir) 1233 dput(sdp->sd_master_dir); 1234 if (sb->s_root) 1235 dput(sb->s_root); 1236 sb->s_root = NULL; 1237fail_locking: 1238 init_locking(sdp, &mount_gh, UNDO); 1239fail_lm: 1240 gfs2_gl_hash_clear(sdp); 1241 gfs2_lm_unmount(sdp); 1242fail_debug: 1243 gfs2_delete_debugfs_file(sdp); 1244 free_percpu(sdp->sd_lkstats); 1245 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1246 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1247 gfs2_sys_fs_del(sdp); 1248 sb->s_fs_info = NULL; 1249 return error; 1250} 1251 1252static int set_gfs2_super(struct super_block *s, void *data) 1253{ 1254 s->s_bdev = data; 1255 s->s_dev = s->s_bdev->bd_dev; 1256 1257 /* 1258 * We set the bdi here to the queue backing, file systems can 1259 * overwrite this in ->fill_super() 1260 */ 1261 s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info; 1262 return 0; 1263} 1264 1265static int test_gfs2_super(struct super_block *s, void *ptr) 1266{ 1267 struct block_device *bdev = ptr; 1268 return (bdev == s->s_bdev); 1269} 1270 1271/** 1272 * gfs2_mount - Get the GFS2 superblock 1273 * @fs_type: The GFS2 filesystem type 1274 * @flags: Mount flags 1275 * @dev_name: The name of the device 1276 * @data: The mount arguments 1277 * 1278 * Q. Why not use get_sb_bdev() ? 1279 * A. We need to select one of two root directories to mount, independent 1280 * of whether this is the initial, or subsequent, mount of this sb 1281 * 1282 * Returns: 0 or -ve on error 1283 */ 1284 1285static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags, 1286 const char *dev_name, void *data) 1287{ 1288 struct block_device *bdev; 1289 struct super_block *s; 1290 fmode_t mode = FMODE_READ | FMODE_EXCL; 1291 int error; 1292 struct gfs2_args args; 1293 struct gfs2_sbd *sdp; 1294 1295 if (!(flags & MS_RDONLY)) 1296 mode |= FMODE_WRITE; 1297 1298 bdev = blkdev_get_by_path(dev_name, mode, fs_type); 1299 if (IS_ERR(bdev)) 1300 return ERR_CAST(bdev); 1301 1302 /* 1303 * once the super is inserted into the list by sget, s_umount 1304 * will protect the lockfs code from trying to start a snapshot 1305 * while we are mounting 1306 */ 1307 mutex_lock(&bdev->bd_fsfreeze_mutex); 1308 if (bdev->bd_fsfreeze_count > 0) { 1309 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1310 error = -EBUSY; 1311 goto error_bdev; 1312 } 1313 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev); 1314 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1315 error = PTR_ERR(s); 1316 if (IS_ERR(s)) 1317 goto error_bdev; 1318 1319 if (s->s_root) 1320 blkdev_put(bdev, mode); 1321 1322 memset(&args, 0, sizeof(args)); 1323 args.ar_quota = GFS2_QUOTA_DEFAULT; 1324 args.ar_data = GFS2_DATA_DEFAULT; 1325 args.ar_commit = 30; 1326 args.ar_statfs_quantum = 30; 1327 args.ar_quota_quantum = 60; 1328 args.ar_errors = GFS2_ERRORS_DEFAULT; 1329 1330 error = gfs2_mount_args(&args, data); 1331 if (error) { 1332 printk(KERN_WARNING "GFS2: can't parse mount arguments\n"); 1333 goto error_super; 1334 } 1335 1336 if (s->s_root) { 1337 error = -EBUSY; 1338 if ((flags ^ s->s_flags) & MS_RDONLY) 1339 goto error_super; 1340 } else { 1341 char b[BDEVNAME_SIZE]; 1342 1343 s->s_mode = mode; 1344 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); 1345 sb_set_blocksize(s, block_size(bdev)); 1346 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0); 1347 if (error) 1348 goto error_super; 1349 s->s_flags |= MS_ACTIVE; 1350 bdev->bd_super = s; 1351 } 1352 1353 sdp = s->s_fs_info; 1354 if (args.ar_meta) 1355 return dget(sdp->sd_master_dir); 1356 else 1357 return dget(sdp->sd_root_dir); 1358 1359error_super: 1360 deactivate_locked_super(s); 1361 return ERR_PTR(error); 1362error_bdev: 1363 blkdev_put(bdev, mode); 1364 return ERR_PTR(error); 1365} 1366 1367static int set_meta_super(struct super_block *s, void *ptr) 1368{ 1369 return -EINVAL; 1370} 1371 1372static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type, 1373 int flags, const char *dev_name, void *data) 1374{ 1375 struct super_block *s; 1376 struct gfs2_sbd *sdp; 1377 struct path path; 1378 int error; 1379 1380 error = kern_path(dev_name, LOOKUP_FOLLOW, &path); 1381 if (error) { 1382 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n", 1383 dev_name, error); 1384 return ERR_PTR(error); 1385 } 1386 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags, 1387 path.dentry->d_inode->i_sb->s_bdev); 1388 path_put(&path); 1389 if (IS_ERR(s)) { 1390 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n"); 1391 return ERR_CAST(s); 1392 } 1393 if ((flags ^ s->s_flags) & MS_RDONLY) { 1394 deactivate_locked_super(s); 1395 return ERR_PTR(-EBUSY); 1396 } 1397 sdp = s->s_fs_info; 1398 return dget(sdp->sd_master_dir); 1399} 1400 1401static void gfs2_kill_sb(struct super_block *sb) 1402{ 1403 struct gfs2_sbd *sdp = sb->s_fs_info; 1404 1405 if (sdp == NULL) { 1406 kill_block_super(sb); 1407 return; 1408 } 1409 1410 gfs2_meta_syncfs(sdp); 1411 dput(sdp->sd_root_dir); 1412 dput(sdp->sd_master_dir); 1413 sdp->sd_root_dir = NULL; 1414 sdp->sd_master_dir = NULL; 1415 shrink_dcache_sb(sb); 1416 gfs2_delete_debugfs_file(sdp); 1417 free_percpu(sdp->sd_lkstats); 1418 kill_block_super(sb); 1419} 1420 1421struct file_system_type gfs2_fs_type = { 1422 .name = "gfs2", 1423 .fs_flags = FS_REQUIRES_DEV, 1424 .mount = gfs2_mount, 1425 .kill_sb = gfs2_kill_sb, 1426 .owner = THIS_MODULE, 1427}; 1428 1429struct file_system_type gfs2meta_fs_type = { 1430 .name = "gfs2meta", 1431 .fs_flags = FS_REQUIRES_DEV, 1432 .mount = gfs2_mount_meta, 1433 .owner = THIS_MODULE, 1434}; 1435