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/namei.h> 18#include <linux/mount.h> 19#include <linux/gfs2_ondisk.h> 20#include <linux/quotaops.h> 21 22#include "gfs2.h" 23#include "incore.h" 24#include "bmap.h" 25#include "glock.h" 26#include "glops.h" 27#include "inode.h" 28#include "recovery.h" 29#include "rgrp.h" 30#include "super.h" 31#include "sys.h" 32#include "util.h" 33#include "log.h" 34#include "quota.h" 35#include "dir.h" 36#include "trace_gfs2.h" 37 38#define DO 0 39#define UNDO 1 40 41static const u32 gfs2_old_fs_formats[] = { 42 0 43}; 44 45static const u32 gfs2_old_multihost_formats[] = { 46 0 47}; 48 49/** 50 * gfs2_tune_init - Fill a gfs2_tune structure with default values 51 * @gt: tune 52 * 53 */ 54 55static void gfs2_tune_init(struct gfs2_tune *gt) 56{ 57 spin_lock_init(>->gt_spin); 58 59 gt->gt_quota_simul_sync = 64; 60 gt->gt_quota_warn_period = 10; 61 gt->gt_quota_scale_num = 1; 62 gt->gt_quota_scale_den = 1; 63 gt->gt_new_files_jdata = 0; 64 gt->gt_max_readahead = 1 << 18; 65 gt->gt_complain_secs = 10; 66} 67 68static struct gfs2_sbd *init_sbd(struct super_block *sb) 69{ 70 struct gfs2_sbd *sdp; 71 72 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); 73 if (!sdp) 74 return NULL; 75 76 sb->s_fs_info = sdp; 77 sdp->sd_vfs = sb; 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 spin_lock_init(&sdp->sd_statfs_spin); 84 85 spin_lock_init(&sdp->sd_rindex_spin); 86 mutex_init(&sdp->sd_rindex_mutex); 87 INIT_LIST_HEAD(&sdp->sd_rindex_list); 88 INIT_LIST_HEAD(&sdp->sd_rindex_mru_list); 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_rg); 105 INIT_LIST_HEAD(&sdp->sd_log_le_databuf); 106 INIT_LIST_HEAD(&sdp->sd_log_le_ordered); 107 108 init_waitqueue_head(&sdp->sd_log_waitq); 109 init_waitqueue_head(&sdp->sd_logd_waitq); 110 INIT_LIST_HEAD(&sdp->sd_ail1_list); 111 INIT_LIST_HEAD(&sdp->sd_ail2_list); 112 113 init_rwsem(&sdp->sd_log_flush_lock); 114 atomic_set(&sdp->sd_log_in_flight, 0); 115 init_waitqueue_head(&sdp->sd_log_flush_wait); 116 117 INIT_LIST_HEAD(&sdp->sd_revoke_list); 118 119 mutex_init(&sdp->sd_freeze_lock); 120 121 return sdp; 122} 123 124 125/** 126 * gfs2_check_sb - Check superblock 127 * @sdp: the filesystem 128 * @sb: The superblock 129 * @silent: Don't print a message if the check fails 130 * 131 * Checks the version code of the FS is one that we understand how to 132 * read and that the sizes of the various on-disk structures have not 133 * changed. 134 */ 135 136static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent) 137{ 138 unsigned int x; 139 140 if (sb->sb_magic != GFS2_MAGIC || 141 sb->sb_type != GFS2_METATYPE_SB) { 142 if (!silent) 143 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n"); 144 return -EINVAL; 145 } 146 147 /* If format numbers match exactly, we're done. */ 148 149 if (sb->sb_fs_format == GFS2_FORMAT_FS && 150 sb->sb_multihost_format == GFS2_FORMAT_MULTI) 151 return 0; 152 153 if (sb->sb_fs_format != GFS2_FORMAT_FS) { 154 for (x = 0; gfs2_old_fs_formats[x]; x++) 155 if (gfs2_old_fs_formats[x] == sb->sb_fs_format) 156 break; 157 158 if (!gfs2_old_fs_formats[x]) { 159 printk(KERN_WARNING 160 "GFS2: code version (%u, %u) is incompatible " 161 "with ondisk format (%u, %u)\n", 162 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI, 163 sb->sb_fs_format, sb->sb_multihost_format); 164 printk(KERN_WARNING 165 "GFS2: I don't know how to upgrade this FS\n"); 166 return -EINVAL; 167 } 168 } 169 170 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) { 171 for (x = 0; gfs2_old_multihost_formats[x]; x++) 172 if (gfs2_old_multihost_formats[x] == 173 sb->sb_multihost_format) 174 break; 175 176 if (!gfs2_old_multihost_formats[x]) { 177 printk(KERN_WARNING 178 "GFS2: code version (%u, %u) is incompatible " 179 "with ondisk format (%u, %u)\n", 180 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI, 181 sb->sb_fs_format, sb->sb_multihost_format); 182 printk(KERN_WARNING 183 "GFS2: I don't know how to upgrade this FS\n"); 184 return -EINVAL; 185 } 186 } 187 188 if (!sdp->sd_args.ar_upgrade) { 189 printk(KERN_WARNING 190 "GFS2: code version (%u, %u) is incompatible " 191 "with ondisk format (%u, %u)\n", 192 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI, 193 sb->sb_fs_format, sb->sb_multihost_format); 194 printk(KERN_INFO 195 "GFS2: Use the \"upgrade\" mount option to upgrade " 196 "the FS\n"); 197 printk(KERN_INFO "GFS2: See the manual for more details\n"); 198 return -EINVAL; 199 } 200 201 return 0; 202} 203 204static void end_bio_io_page(struct bio *bio, int error) 205{ 206 struct page *page = bio->bi_private; 207 208 if (!error) 209 SetPageUptodate(page); 210 else 211 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error); 212 unlock_page(page); 213} 214 215static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf) 216{ 217 const struct gfs2_sb *str = buf; 218 219 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 220 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 221 sb->sb_format = be32_to_cpu(str->sb_header.mh_format); 222 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 223 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 224 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 225 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 226 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 227 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 228 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 229 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 230 231 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 232 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 233 memcpy(sb->sb_uuid, str->sb_uuid, 16); 234} 235 236/** 237 * gfs2_read_super - Read the gfs2 super block from disk 238 * @sdp: The GFS2 super block 239 * @sector: The location of the super block 240 * @error: The error code to return 241 * 242 * This uses the bio functions to read the super block from disk 243 * because we want to be 100% sure that we never read cached data. 244 * A super block is read twice only during each GFS2 mount and is 245 * never written to by the filesystem. The first time its read no 246 * locks are held, and the only details which are looked at are those 247 * relating to the locking protocol. Once locking is up and working, 248 * the sb is read again under the lock to establish the location of 249 * the master directory (contains pointers to journals etc) and the 250 * root directory. 251 * 252 * Returns: 0 on success or error 253 */ 254 255static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector) 256{ 257 struct super_block *sb = sdp->sd_vfs; 258 struct gfs2_sb *p; 259 struct page *page; 260 struct bio *bio; 261 262 page = alloc_page(GFP_NOFS); 263 if (unlikely(!page)) 264 return -ENOBUFS; 265 266 ClearPageUptodate(page); 267 ClearPageDirty(page); 268 lock_page(page); 269 270 bio = bio_alloc(GFP_NOFS, 1); 271 bio->bi_sector = sector * (sb->s_blocksize >> 9); 272 bio->bi_bdev = sb->s_bdev; 273 bio_add_page(bio, page, PAGE_SIZE, 0); 274 275 bio->bi_end_io = end_bio_io_page; 276 bio->bi_private = page; 277 submit_bio(READ_SYNC | REQ_META, bio); 278 wait_on_page_locked(page); 279 bio_put(bio); 280 if (!PageUptodate(page)) { 281 __free_page(page); 282 return -EIO; 283 } 284 p = kmap(page); 285 gfs2_sb_in(&sdp->sd_sb, p); 286 kunmap(page); 287 __free_page(page); 288 return 0; 289} 290 291/** 292 * gfs2_read_sb - Read super block 293 * @sdp: The GFS2 superblock 294 * @silent: Don't print message if mount fails 295 * 296 */ 297 298static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 299{ 300 u32 hash_blocks, ind_blocks, leaf_blocks; 301 u32 tmp_blocks; 302 unsigned int x; 303 int error; 304 305 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift); 306 if (error) { 307 if (!silent) 308 fs_err(sdp, "can't read superblock\n"); 309 return error; 310 } 311 312 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent); 313 if (error) 314 return error; 315 316 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 317 GFS2_BASIC_BLOCK_SHIFT; 318 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; 319 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 320 sizeof(struct gfs2_dinode)) / sizeof(u64); 321 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 322 sizeof(struct gfs2_meta_header)) / sizeof(u64); 323 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 324 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 325 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 326 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 327 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 328 sizeof(struct gfs2_meta_header)) / 329 sizeof(struct gfs2_quota_change); 330 331 /* Compute maximum reservation required to add a entry to a directory */ 332 333 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH), 334 sdp->sd_jbsize); 335 336 ind_blocks = 0; 337 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 338 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 339 ind_blocks += tmp_blocks; 340 } 341 342 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 343 344 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 345 346 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 347 sizeof(struct gfs2_dinode); 348 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 349 for (x = 2;; x++) { 350 u64 space, d; 351 u32 m; 352 353 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 354 d = space; 355 m = do_div(d, sdp->sd_inptrs); 356 357 if (d != sdp->sd_heightsize[x - 1] || m) 358 break; 359 sdp->sd_heightsize[x] = space; 360 } 361 sdp->sd_max_height = x; 362 sdp->sd_heightsize[x] = ~0; 363 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 364 365 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize - 366 sizeof(struct gfs2_dinode); 367 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs; 368 for (x = 2;; x++) { 369 u64 space, d; 370 u32 m; 371 372 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs; 373 d = space; 374 m = do_div(d, sdp->sd_inptrs); 375 376 if (d != sdp->sd_jheightsize[x - 1] || m) 377 break; 378 sdp->sd_jheightsize[x] = space; 379 } 380 sdp->sd_max_jheight = x; 381 sdp->sd_jheightsize[x] = ~0; 382 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT); 383 384 return 0; 385} 386 387static int init_names(struct gfs2_sbd *sdp, int silent) 388{ 389 char *proto, *table; 390 int error = 0; 391 392 proto = sdp->sd_args.ar_lockproto; 393 table = sdp->sd_args.ar_locktable; 394 395 /* Try to autodetect */ 396 397 if (!proto[0] || !table[0]) { 398 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift); 399 if (error) 400 return error; 401 402 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent); 403 if (error) 404 goto out; 405 406 if (!proto[0]) 407 proto = sdp->sd_sb.sb_lockproto; 408 if (!table[0]) 409 table = sdp->sd_sb.sb_locktable; 410 } 411 412 if (!table[0]) 413 table = sdp->sd_vfs->s_id; 414 415 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 416 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 417 418 table = sdp->sd_table_name; 419 while ((table = strchr(table, '/'))) 420 *table = '_'; 421 422out: 423 return error; 424} 425 426static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 427 int undo) 428{ 429 int error = 0; 430 431 if (undo) 432 goto fail_trans; 433 434 error = gfs2_glock_nq_num(sdp, 435 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 436 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 437 mount_gh); 438 if (error) { 439 fs_err(sdp, "can't acquire mount glock: %d\n", error); 440 goto fail; 441 } 442 443 error = gfs2_glock_nq_num(sdp, 444 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 445 LM_ST_SHARED, 446 LM_FLAG_NOEXP | GL_EXACT, 447 &sdp->sd_live_gh); 448 if (error) { 449 fs_err(sdp, "can't acquire live glock: %d\n", error); 450 goto fail_mount; 451 } 452 453 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 454 CREATE, &sdp->sd_rename_gl); 455 if (error) { 456 fs_err(sdp, "can't create rename glock: %d\n", error); 457 goto fail_live; 458 } 459 460 error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops, 461 CREATE, &sdp->sd_trans_gl); 462 if (error) { 463 fs_err(sdp, "can't create transaction glock: %d\n", error); 464 goto fail_rename; 465 } 466 467 return 0; 468 469fail_trans: 470 gfs2_glock_put(sdp->sd_trans_gl); 471fail_rename: 472 gfs2_glock_put(sdp->sd_rename_gl); 473fail_live: 474 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 475fail_mount: 476 gfs2_glock_dq_uninit(mount_gh); 477fail: 478 return error; 479} 480 481static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 482 u64 no_addr, const char *name) 483{ 484 struct gfs2_sbd *sdp = sb->s_fs_info; 485 struct dentry *dentry; 486 struct inode *inode; 487 488 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0); 489 if (IS_ERR(inode)) { 490 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 491 return PTR_ERR(inode); 492 } 493 dentry = d_alloc_root(inode); 494 if (!dentry) { 495 fs_err(sdp, "can't alloc %s dentry\n", name); 496 iput(inode); 497 return -ENOMEM; 498 } 499 dentry->d_op = &gfs2_dops; 500 *dptr = dentry; 501 return 0; 502} 503 504static int init_sb(struct gfs2_sbd *sdp, int silent) 505{ 506 struct super_block *sb = sdp->sd_vfs; 507 struct gfs2_holder sb_gh; 508 u64 no_addr; 509 int ret; 510 511 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 512 LM_ST_SHARED, 0, &sb_gh); 513 if (ret) { 514 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 515 return ret; 516 } 517 518 ret = gfs2_read_sb(sdp, silent); 519 if (ret) { 520 fs_err(sdp, "can't read superblock: %d\n", ret); 521 goto out; 522 } 523 524 /* Set up the buffer cache and SB for real */ 525 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 526 ret = -EINVAL; 527 fs_err(sdp, "FS block size (%u) is too small for device " 528 "block size (%u)\n", 529 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 530 goto out; 531 } 532 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 533 ret = -EINVAL; 534 fs_err(sdp, "FS block size (%u) is too big for machine " 535 "page size (%u)\n", 536 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 537 goto out; 538 } 539 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 540 541 /* Get the root inode */ 542 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 543 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 544 if (ret) 545 goto out; 546 547 /* Get the master inode */ 548 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 549 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 550 if (ret) { 551 dput(sdp->sd_root_dir); 552 goto out; 553 } 554 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 555out: 556 gfs2_glock_dq_uninit(&sb_gh); 557 return ret; 558} 559 560/** 561 * map_journal_extents - create a reusable "extent" mapping from all logical 562 * blocks to all physical blocks for the given journal. This will save 563 * us time when writing journal blocks. Most journals will have only one 564 * extent that maps all their logical blocks. That's because gfs2.mkfs 565 * arranges the journal blocks sequentially to maximize performance. 566 * So the extent would map the first block for the entire file length. 567 * However, gfs2_jadd can happen while file activity is happening, so 568 * those journals may not be sequential. Less likely is the case where 569 * the users created their own journals by mounting the metafs and 570 * laying it out. But it's still possible. These journals might have 571 * several extents. 572 * 573 * TODO: This should be done in bigger chunks rather than one block at a time, 574 * but since it's only done at mount time, I'm not worried about the 575 * time it takes. 576 */ 577static int map_journal_extents(struct gfs2_sbd *sdp) 578{ 579 struct gfs2_jdesc *jd = sdp->sd_jdesc; 580 unsigned int lb; 581 u64 db, prev_db; /* logical block, disk block, prev disk block */ 582 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 583 struct gfs2_journal_extent *jext = NULL; 584 struct buffer_head bh; 585 int rc = 0; 586 587 prev_db = 0; 588 589 for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) { 590 bh.b_state = 0; 591 bh.b_blocknr = 0; 592 bh.b_size = 1 << ip->i_inode.i_blkbits; 593 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0); 594 db = bh.b_blocknr; 595 if (rc || !db) { 596 printk(KERN_INFO "GFS2 journal mapping error %d: lb=" 597 "%u db=%llu\n", rc, lb, (unsigned long long)db); 598 break; 599 } 600 if (!prev_db || db != prev_db + 1) { 601 jext = kzalloc(sizeof(struct gfs2_journal_extent), 602 GFP_KERNEL); 603 if (!jext) { 604 printk(KERN_INFO "GFS2 error: out of memory " 605 "mapping journal extents.\n"); 606 rc = -ENOMEM; 607 break; 608 } 609 jext->dblock = db; 610 jext->lblock = lb; 611 jext->blocks = 1; 612 list_add_tail(&jext->extent_list, &jd->extent_list); 613 } else { 614 jext->blocks++; 615 } 616 prev_db = db; 617 } 618 return rc; 619} 620 621static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 622{ 623 char *message = "FIRSTMOUNT=Done"; 624 char *envp[] = { message, NULL }; 625 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 626 ls->ls_first_done = 1; 627 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 628} 629 630/** 631 * gfs2_jindex_hold - Grab a lock on the jindex 632 * @sdp: The GFS2 superblock 633 * @ji_gh: the holder for the jindex glock 634 * 635 * Returns: errno 636 */ 637 638static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 639{ 640 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 641 struct qstr name; 642 char buf[20]; 643 struct gfs2_jdesc *jd; 644 int error; 645 646 name.name = buf; 647 648 mutex_lock(&sdp->sd_jindex_mutex); 649 650 for (;;) { 651 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 652 if (error) 653 break; 654 655 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 656 name.hash = gfs2_disk_hash(name.name, name.len); 657 658 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 659 if (error == -ENOENT) { 660 error = 0; 661 break; 662 } 663 664 gfs2_glock_dq_uninit(ji_gh); 665 666 if (error) 667 break; 668 669 error = -ENOMEM; 670 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 671 if (!jd) 672 break; 673 674 INIT_LIST_HEAD(&jd->extent_list); 675 INIT_WORK(&jd->jd_work, gfs2_recover_func); 676 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 677 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { 678 if (!jd->jd_inode) 679 error = -ENOENT; 680 else 681 error = PTR_ERR(jd->jd_inode); 682 kfree(jd); 683 break; 684 } 685 686 spin_lock(&sdp->sd_jindex_spin); 687 jd->jd_jid = sdp->sd_journals++; 688 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 689 spin_unlock(&sdp->sd_jindex_spin); 690 } 691 692 mutex_unlock(&sdp->sd_jindex_mutex); 693 694 return error; 695} 696 697static int init_journal(struct gfs2_sbd *sdp, int undo) 698{ 699 struct inode *master = sdp->sd_master_dir->d_inode; 700 struct gfs2_holder ji_gh; 701 struct gfs2_inode *ip; 702 int jindex = 1; 703 int error = 0; 704 705 if (undo) { 706 jindex = 0; 707 goto fail_jinode_gh; 708 } 709 710 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 711 if (IS_ERR(sdp->sd_jindex)) { 712 fs_err(sdp, "can't lookup journal index: %d\n", error); 713 return PTR_ERR(sdp->sd_jindex); 714 } 715 ip = GFS2_I(sdp->sd_jindex); 716 717 /* Load in the journal index special file */ 718 719 error = gfs2_jindex_hold(sdp, &ji_gh); 720 if (error) { 721 fs_err(sdp, "can't read journal index: %d\n", error); 722 goto fail; 723 } 724 725 error = -EUSERS; 726 if (!gfs2_jindex_size(sdp)) { 727 fs_err(sdp, "no journals!\n"); 728 goto fail_jindex; 729 } 730 731 if (sdp->sd_args.ar_spectator) { 732 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 733 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 734 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 735 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 736 } else { 737 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 738 fs_err(sdp, "can't mount journal #%u\n", 739 sdp->sd_lockstruct.ls_jid); 740 fs_err(sdp, "there are only %u journals (0 - %u)\n", 741 gfs2_jindex_size(sdp), 742 gfs2_jindex_size(sdp) - 1); 743 goto fail_jindex; 744 } 745 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 746 747 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 748 &gfs2_journal_glops, 749 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, 750 &sdp->sd_journal_gh); 751 if (error) { 752 fs_err(sdp, "can't acquire journal glock: %d\n", error); 753 goto fail_jindex; 754 } 755 756 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 757 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 758 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 759 &sdp->sd_jinode_gh); 760 if (error) { 761 fs_err(sdp, "can't acquire journal inode glock: %d\n", 762 error); 763 goto fail_journal_gh; 764 } 765 766 error = gfs2_jdesc_check(sdp->sd_jdesc); 767 if (error) { 768 fs_err(sdp, "my journal (%u) is bad: %d\n", 769 sdp->sd_jdesc->jd_jid, error); 770 goto fail_jinode_gh; 771 } 772 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 773 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 774 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 775 776 /* Map the extents for this journal's blocks */ 777 map_journal_extents(sdp); 778 } 779 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 780 781 if (sdp->sd_lockstruct.ls_first) { 782 unsigned int x; 783 for (x = 0; x < sdp->sd_journals; x++) { 784 error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x), 785 true); 786 if (error) { 787 fs_err(sdp, "error recovering journal %u: %d\n", 788 x, error); 789 goto fail_jinode_gh; 790 } 791 } 792 793 gfs2_others_may_mount(sdp); 794 } else if (!sdp->sd_args.ar_spectator) { 795 error = gfs2_recover_journal(sdp->sd_jdesc, true); 796 if (error) { 797 fs_err(sdp, "error recovering my journal: %d\n", error); 798 goto fail_jinode_gh; 799 } 800 } 801 802 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 803 gfs2_glock_dq_uninit(&ji_gh); 804 jindex = 0; 805 806 return 0; 807 808fail_jinode_gh: 809 if (!sdp->sd_args.ar_spectator) 810 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 811fail_journal_gh: 812 if (!sdp->sd_args.ar_spectator) 813 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 814fail_jindex: 815 gfs2_jindex_free(sdp); 816 if (jindex) 817 gfs2_glock_dq_uninit(&ji_gh); 818fail: 819 iput(sdp->sd_jindex); 820 return error; 821} 822 823 824static int init_inodes(struct gfs2_sbd *sdp, int undo) 825{ 826 int error = 0; 827 struct gfs2_inode *ip; 828 struct inode *master = sdp->sd_master_dir->d_inode; 829 830 if (undo) 831 goto fail_qinode; 832 833 error = init_journal(sdp, undo); 834 if (error) 835 goto fail; 836 837 /* Read in the master statfs inode */ 838 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 839 if (IS_ERR(sdp->sd_statfs_inode)) { 840 error = PTR_ERR(sdp->sd_statfs_inode); 841 fs_err(sdp, "can't read in statfs inode: %d\n", error); 842 goto fail_journal; 843 } 844 845 /* Read in the resource index inode */ 846 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 847 if (IS_ERR(sdp->sd_rindex)) { 848 error = PTR_ERR(sdp->sd_rindex); 849 fs_err(sdp, "can't get resource index inode: %d\n", error); 850 goto fail_statfs; 851 } 852 ip = GFS2_I(sdp->sd_rindex); 853 sdp->sd_rindex_uptodate = 0; 854 855 /* Read in the quota inode */ 856 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 857 if (IS_ERR(sdp->sd_quota_inode)) { 858 error = PTR_ERR(sdp->sd_quota_inode); 859 fs_err(sdp, "can't get quota file inode: %d\n", error); 860 goto fail_rindex; 861 } 862 return 0; 863 864fail_qinode: 865 iput(sdp->sd_quota_inode); 866fail_rindex: 867 gfs2_clear_rgrpd(sdp); 868 iput(sdp->sd_rindex); 869fail_statfs: 870 iput(sdp->sd_statfs_inode); 871fail_journal: 872 init_journal(sdp, UNDO); 873fail: 874 return error; 875} 876 877static int init_per_node(struct gfs2_sbd *sdp, int undo) 878{ 879 struct inode *pn = NULL; 880 char buf[30]; 881 int error = 0; 882 struct gfs2_inode *ip; 883 struct inode *master = sdp->sd_master_dir->d_inode; 884 885 if (sdp->sd_args.ar_spectator) 886 return 0; 887 888 if (undo) 889 goto fail_qc_gh; 890 891 pn = gfs2_lookup_simple(master, "per_node"); 892 if (IS_ERR(pn)) { 893 error = PTR_ERR(pn); 894 fs_err(sdp, "can't find per_node directory: %d\n", error); 895 return error; 896 } 897 898 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 899 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 900 if (IS_ERR(sdp->sd_sc_inode)) { 901 error = PTR_ERR(sdp->sd_sc_inode); 902 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 903 goto fail; 904 } 905 906 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 907 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 908 if (IS_ERR(sdp->sd_qc_inode)) { 909 error = PTR_ERR(sdp->sd_qc_inode); 910 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 911 goto fail_ut_i; 912 } 913 914 iput(pn); 915 pn = NULL; 916 917 ip = GFS2_I(sdp->sd_sc_inode); 918 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 919 &sdp->sd_sc_gh); 920 if (error) { 921 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 922 goto fail_qc_i; 923 } 924 925 ip = GFS2_I(sdp->sd_qc_inode); 926 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 927 &sdp->sd_qc_gh); 928 if (error) { 929 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 930 goto fail_ut_gh; 931 } 932 933 return 0; 934 935fail_qc_gh: 936 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 937fail_ut_gh: 938 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 939fail_qc_i: 940 iput(sdp->sd_qc_inode); 941fail_ut_i: 942 iput(sdp->sd_sc_inode); 943fail: 944 if (pn) 945 iput(pn); 946 return error; 947} 948 949static int init_threads(struct gfs2_sbd *sdp, int undo) 950{ 951 struct task_struct *p; 952 int error = 0; 953 954 if (undo) 955 goto fail_quotad; 956 957 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 958 error = IS_ERR(p); 959 if (error) { 960 fs_err(sdp, "can't start logd thread: %d\n", error); 961 return error; 962 } 963 sdp->sd_logd_process = p; 964 965 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 966 error = IS_ERR(p); 967 if (error) { 968 fs_err(sdp, "can't start quotad thread: %d\n", error); 969 goto fail; 970 } 971 sdp->sd_quotad_process = p; 972 973 return 0; 974 975 976fail_quotad: 977 kthread_stop(sdp->sd_quotad_process); 978fail: 979 kthread_stop(sdp->sd_logd_process); 980 return error; 981} 982 983static const match_table_t nolock_tokens = { 984 { Opt_jid, "jid=%d\n", }, 985 { Opt_err, NULL }, 986}; 987 988static void nolock_put_lock(struct kmem_cache *cachep, struct gfs2_glock *gl) 989{ 990 struct gfs2_sbd *sdp = gl->gl_sbd; 991 kmem_cache_free(cachep, gl); 992 if (atomic_dec_and_test(&sdp->sd_glock_disposal)) 993 wake_up(&sdp->sd_glock_wait); 994} 995 996static const struct lm_lockops nolock_ops = { 997 .lm_proto_name = "lock_nolock", 998 .lm_put_lock = nolock_put_lock, 999 .lm_tokens = &nolock_tokens, 1000}; 1001 1002/** 1003 * gfs2_lm_mount - mount a locking protocol 1004 * @sdp: the filesystem 1005 * @args: mount arguments 1006 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 1007 * 1008 * Returns: errno 1009 */ 1010 1011static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 1012{ 1013 const struct lm_lockops *lm; 1014 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 1015 struct gfs2_args *args = &sdp->sd_args; 1016 const char *proto = sdp->sd_proto_name; 1017 const char *table = sdp->sd_table_name; 1018 const char *fsname; 1019 char *o, *options; 1020 int ret; 1021 1022 if (!strcmp("lock_nolock", proto)) { 1023 lm = &nolock_ops; 1024 sdp->sd_args.ar_localflocks = 1; 1025 sdp->sd_args.ar_localcaching = 1; 1026#ifdef CONFIG_GFS2_FS_LOCKING_DLM 1027 } else if (!strcmp("lock_dlm", proto)) { 1028 lm = &gfs2_dlm_ops; 1029#endif 1030 } else { 1031 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto); 1032 return -ENOENT; 1033 } 1034 1035 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 1036 1037 ls->ls_ops = lm; 1038 ls->ls_first = 1; 1039 1040 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 1041 substring_t tmp[MAX_OPT_ARGS]; 1042 int token, option; 1043 1044 if (!o || !*o) 1045 continue; 1046 1047 token = match_token(o, *lm->lm_tokens, tmp); 1048 switch (token) { 1049 case Opt_jid: 1050 ret = match_int(&tmp[0], &option); 1051 if (ret || option < 0) 1052 goto hostdata_error; 1053 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 1054 ls->ls_jid = option; 1055 break; 1056 case Opt_id: 1057 /* Obsolete, but left for backward compat purposes */ 1058 break; 1059 case Opt_first: 1060 ret = match_int(&tmp[0], &option); 1061 if (ret || (option != 0 && option != 1)) 1062 goto hostdata_error; 1063 ls->ls_first = option; 1064 break; 1065 case Opt_nodir: 1066 ret = match_int(&tmp[0], &option); 1067 if (ret || (option != 0 && option != 1)) 1068 goto hostdata_error; 1069 ls->ls_nodir = option; 1070 break; 1071 case Opt_err: 1072 default: 1073hostdata_error: 1074 fs_info(sdp, "unknown hostdata (%s)\n", o); 1075 return -EINVAL; 1076 } 1077 } 1078 1079 if (sdp->sd_args.ar_spectator) 1080 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table); 1081 else 1082 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table, 1083 sdp->sd_lockstruct.ls_jid); 1084 1085 fsname = strchr(table, ':'); 1086 if (fsname) 1087 fsname++; 1088 if (lm->lm_mount == NULL) { 1089 fs_info(sdp, "Now mounting FS...\n"); 1090 return 0; 1091 } 1092 ret = lm->lm_mount(sdp, fsname); 1093 if (ret == 0) 1094 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1095 return ret; 1096} 1097 1098void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1099{ 1100 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1101 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && 1102 lm->lm_unmount) 1103 lm->lm_unmount(sdp); 1104} 1105 1106static int gfs2_journalid_wait(void *word) 1107{ 1108 if (signal_pending(current)) 1109 return -EINTR; 1110 schedule(); 1111 return 0; 1112} 1113 1114static int wait_on_journal(struct gfs2_sbd *sdp) 1115{ 1116 if (sdp->sd_args.ar_spectator) 1117 return 0; 1118 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1119 return 0; 1120 1121 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE); 1122} 1123 1124void gfs2_online_uevent(struct gfs2_sbd *sdp) 1125{ 1126 struct super_block *sb = sdp->sd_vfs; 1127 char ro[20]; 1128 char spectator[20]; 1129 char *envp[] = { ro, spectator, NULL }; 1130 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 1131 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1132 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1133} 1134 1135/** 1136 * fill_super - Read in superblock 1137 * @sb: The VFS superblock 1138 * @data: Mount options 1139 * @silent: Don't complain if it's not a GFS2 filesystem 1140 * 1141 * Returns: errno 1142 */ 1143 1144static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent) 1145{ 1146 struct gfs2_sbd *sdp; 1147 struct gfs2_holder mount_gh; 1148 int error; 1149 1150 sdp = init_sbd(sb); 1151 if (!sdp) { 1152 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n"); 1153 return -ENOMEM; 1154 } 1155 sdp->sd_args = *args; 1156 1157 if (sdp->sd_args.ar_spectator) { 1158 sb->s_flags |= MS_RDONLY; 1159 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 1160 } 1161 if (sdp->sd_args.ar_posix_acl) 1162 sb->s_flags |= MS_POSIXACL; 1163 if (sdp->sd_args.ar_nobarrier) 1164 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1165 1166 sb->s_magic = GFS2_MAGIC; 1167 sb->s_op = &gfs2_super_ops; 1168 sb->s_export_op = &gfs2_export_ops; 1169 sb->s_xattr = gfs2_xattr_handlers; 1170 sb->s_qcop = &gfs2_quotactl_ops; 1171 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1172 sb->s_time_gran = 1; 1173 sb->s_maxbytes = MAX_LFS_FILESIZE; 1174 1175 /* Set up the buffer cache and fill in some fake block size values 1176 to allow us to read-in the on-disk superblock. */ 1177 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1178 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1179 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1180 GFS2_BASIC_BLOCK_SHIFT; 1181 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; 1182 1183 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1184 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1185 if (sdp->sd_args.ar_statfs_quantum) { 1186 sdp->sd_tune.gt_statfs_slow = 0; 1187 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1188 } 1189 else { 1190 sdp->sd_tune.gt_statfs_slow = 1; 1191 sdp->sd_tune.gt_statfs_quantum = 30; 1192 } 1193 1194 error = init_names(sdp, silent); 1195 if (error) 1196 goto fail; 1197 1198 gfs2_create_debugfs_file(sdp); 1199 1200 error = gfs2_sys_fs_add(sdp); 1201 if (error) 1202 goto fail; 1203 1204 error = gfs2_lm_mount(sdp, silent); 1205 if (error) 1206 goto fail_sys; 1207 1208 error = init_locking(sdp, &mount_gh, DO); 1209 if (error) 1210 goto fail_lm; 1211 1212 error = init_sb(sdp, silent); 1213 if (error) 1214 goto fail_locking; 1215 1216 error = wait_on_journal(sdp); 1217 if (error) 1218 goto fail_sb; 1219 1220 error = init_inodes(sdp, DO); 1221 if (error) 1222 goto fail_sb; 1223 1224 error = init_per_node(sdp, DO); 1225 if (error) 1226 goto fail_inodes; 1227 1228 error = gfs2_statfs_init(sdp); 1229 if (error) { 1230 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1231 goto fail_per_node; 1232 } 1233 1234 error = init_threads(sdp, DO); 1235 if (error) 1236 goto fail_per_node; 1237 1238 if (!(sb->s_flags & MS_RDONLY)) { 1239 error = gfs2_make_fs_rw(sdp); 1240 if (error) { 1241 fs_err(sdp, "can't make FS RW: %d\n", error); 1242 goto fail_threads; 1243 } 1244 } 1245 1246 gfs2_glock_dq_uninit(&mount_gh); 1247 gfs2_online_uevent(sdp); 1248 return 0; 1249 1250fail_threads: 1251 init_threads(sdp, UNDO); 1252fail_per_node: 1253 init_per_node(sdp, UNDO); 1254fail_inodes: 1255 init_inodes(sdp, UNDO); 1256fail_sb: 1257 if (sdp->sd_root_dir) 1258 dput(sdp->sd_root_dir); 1259 if (sdp->sd_master_dir) 1260 dput(sdp->sd_master_dir); 1261 if (sb->s_root) 1262 dput(sb->s_root); 1263 sb->s_root = NULL; 1264fail_locking: 1265 init_locking(sdp, &mount_gh, UNDO); 1266fail_lm: 1267 invalidate_inodes(sb); 1268 gfs2_gl_hash_clear(sdp); 1269 gfs2_lm_unmount(sdp); 1270fail_sys: 1271 gfs2_sys_fs_del(sdp); 1272fail: 1273 gfs2_delete_debugfs_file(sdp); 1274 kfree(sdp); 1275 sb->s_fs_info = NULL; 1276 return error; 1277} 1278 1279static int set_gfs2_super(struct super_block *s, void *data) 1280{ 1281 s->s_bdev = data; 1282 s->s_dev = s->s_bdev->bd_dev; 1283 1284 /* 1285 * We set the bdi here to the queue backing, file systems can 1286 * overwrite this in ->fill_super() 1287 */ 1288 s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info; 1289 return 0; 1290} 1291 1292static int test_gfs2_super(struct super_block *s, void *ptr) 1293{ 1294 struct block_device *bdev = ptr; 1295 return (bdev == s->s_bdev); 1296} 1297 1298/** 1299 * gfs2_get_sb - Get the GFS2 superblock 1300 * @fs_type: The GFS2 filesystem type 1301 * @flags: Mount flags 1302 * @dev_name: The name of the device 1303 * @data: The mount arguments 1304 * @mnt: The vfsmnt for this mount 1305 * 1306 * Q. Why not use get_sb_bdev() ? 1307 * A. We need to select one of two root directories to mount, independent 1308 * of whether this is the initial, or subsequent, mount of this sb 1309 * 1310 * Returns: 0 or -ve on error 1311 */ 1312 1313static int gfs2_get_sb(struct file_system_type *fs_type, int flags, 1314 const char *dev_name, void *data, struct vfsmount *mnt) 1315{ 1316 struct block_device *bdev; 1317 struct super_block *s; 1318 fmode_t mode = FMODE_READ; 1319 int error; 1320 struct gfs2_args args; 1321 struct gfs2_sbd *sdp; 1322 1323 if (!(flags & MS_RDONLY)) 1324 mode |= FMODE_WRITE; 1325 1326 bdev = open_bdev_exclusive(dev_name, mode, fs_type); 1327 if (IS_ERR(bdev)) 1328 return PTR_ERR(bdev); 1329 1330 /* 1331 * once the super is inserted into the list by sget, s_umount 1332 * will protect the lockfs code from trying to start a snapshot 1333 * while we are mounting 1334 */ 1335 mutex_lock(&bdev->bd_fsfreeze_mutex); 1336 if (bdev->bd_fsfreeze_count > 0) { 1337 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1338 error = -EBUSY; 1339 goto error_bdev; 1340 } 1341 s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev); 1342 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1343 error = PTR_ERR(s); 1344 if (IS_ERR(s)) 1345 goto error_bdev; 1346 1347 memset(&args, 0, sizeof(args)); 1348 args.ar_quota = GFS2_QUOTA_DEFAULT; 1349 args.ar_data = GFS2_DATA_DEFAULT; 1350 args.ar_commit = 30; 1351 args.ar_statfs_quantum = 30; 1352 args.ar_quota_quantum = 60; 1353 args.ar_errors = GFS2_ERRORS_DEFAULT; 1354 1355 error = gfs2_mount_args(&args, data); 1356 if (error) { 1357 printk(KERN_WARNING "GFS2: can't parse mount arguments\n"); 1358 if (s->s_root) 1359 goto error_super; 1360 deactivate_locked_super(s); 1361 return error; 1362 } 1363 1364 if (s->s_root) { 1365 error = -EBUSY; 1366 if ((flags ^ s->s_flags) & MS_RDONLY) 1367 goto error_super; 1368 close_bdev_exclusive(bdev, mode); 1369 } else { 1370 char b[BDEVNAME_SIZE]; 1371 1372 s->s_flags = flags; 1373 s->s_mode = mode; 1374 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); 1375 sb_set_blocksize(s, block_size(bdev)); 1376 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0); 1377 if (error) { 1378 deactivate_locked_super(s); 1379 return error; 1380 } 1381 s->s_flags |= MS_ACTIVE; 1382 bdev->bd_super = s; 1383 } 1384 1385 sdp = s->s_fs_info; 1386 mnt->mnt_sb = s; 1387 if (args.ar_meta) 1388 mnt->mnt_root = dget(sdp->sd_master_dir); 1389 else 1390 mnt->mnt_root = dget(sdp->sd_root_dir); 1391 return 0; 1392 1393error_super: 1394 deactivate_locked_super(s); 1395error_bdev: 1396 close_bdev_exclusive(bdev, mode); 1397 return error; 1398} 1399 1400static int set_meta_super(struct super_block *s, void *ptr) 1401{ 1402 return -EINVAL; 1403} 1404 1405static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags, 1406 const char *dev_name, void *data, struct vfsmount *mnt) 1407{ 1408 struct super_block *s; 1409 struct gfs2_sbd *sdp; 1410 struct path path; 1411 int error; 1412 1413 error = kern_path(dev_name, LOOKUP_FOLLOW, &path); 1414 if (error) { 1415 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n", 1416 dev_name, error); 1417 return error; 1418 } 1419 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, 1420 path.dentry->d_inode->i_sb->s_bdev); 1421 path_put(&path); 1422 if (IS_ERR(s)) { 1423 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n"); 1424 return PTR_ERR(s); 1425 } 1426 if ((flags ^ s->s_flags) & MS_RDONLY) { 1427 deactivate_locked_super(s); 1428 return -EBUSY; 1429 } 1430 sdp = s->s_fs_info; 1431 mnt->mnt_sb = s; 1432 mnt->mnt_root = dget(sdp->sd_master_dir); 1433 return 0; 1434} 1435 1436static void gfs2_kill_sb(struct super_block *sb) 1437{ 1438 struct gfs2_sbd *sdp = sb->s_fs_info; 1439 1440 if (sdp == NULL) { 1441 kill_block_super(sb); 1442 return; 1443 } 1444 1445 gfs2_meta_syncfs(sdp); 1446 dput(sdp->sd_root_dir); 1447 dput(sdp->sd_master_dir); 1448 sdp->sd_root_dir = NULL; 1449 sdp->sd_master_dir = NULL; 1450 shrink_dcache_sb(sb); 1451 kill_block_super(sb); 1452 gfs2_delete_debugfs_file(sdp); 1453 kfree(sdp); 1454} 1455 1456struct file_system_type gfs2_fs_type = { 1457 .name = "gfs2", 1458 .fs_flags = FS_REQUIRES_DEV, 1459 .get_sb = gfs2_get_sb, 1460 .kill_sb = gfs2_kill_sb, 1461 .owner = THIS_MODULE, 1462}; 1463 1464struct file_system_type gfs2meta_fs_type = { 1465 .name = "gfs2meta", 1466 .fs_flags = FS_REQUIRES_DEV, 1467 .get_sb = gfs2_get_sb_meta, 1468 .owner = THIS_MODULE, 1469}; 1470