1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/sched.h> 10 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/blkdev.h> 15 #include <linux/kthread.h> 16 #include <linux/export.h> 17 #include <linux/namei.h> 18 #include <linux/mount.h> 19 #include <linux/gfs2_ondisk.h> 20 #include <linux/quotaops.h> 21 #include <linux/lockdep.h> 22 #include <linux/module.h> 23 #include <linux/backing-dev.h> 24 #include <linux/fs_parser.h> 25 26 #include "gfs2.h" 27 #include "incore.h" 28 #include "bmap.h" 29 #include "glock.h" 30 #include "glops.h" 31 #include "inode.h" 32 #include "recovery.h" 33 #include "rgrp.h" 34 #include "super.h" 35 #include "sys.h" 36 #include "util.h" 37 #include "log.h" 38 #include "quota.h" 39 #include "dir.h" 40 #include "meta_io.h" 41 #include "trace_gfs2.h" 42 #include "lops.h" 43 44 #define DO 0 45 #define UNDO 1 46 47 /** 48 * gfs2_tune_init - Fill a gfs2_tune structure with default values 49 * @gt: tune 50 * 51 */ 52 53 static void gfs2_tune_init(struct gfs2_tune *gt) 54 { 55 spin_lock_init(>->gt_spin); 56 57 gt->gt_quota_warn_period = 10; 58 gt->gt_quota_scale_num = 1; 59 gt->gt_quota_scale_den = 1; 60 gt->gt_new_files_jdata = 0; 61 gt->gt_max_readahead = BIT(18); 62 gt->gt_complain_secs = 10; 63 } 64 65 void free_sbd(struct gfs2_sbd *sdp) 66 { 67 if (sdp->sd_lkstats) 68 free_percpu(sdp->sd_lkstats); 69 kfree(sdp); 70 } 71 72 static struct gfs2_sbd *init_sbd(struct super_block *sb) 73 { 74 struct gfs2_sbd *sdp; 75 struct address_space *mapping; 76 77 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); 78 if (!sdp) 79 return NULL; 80 81 sdp->sd_vfs = sb; 82 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats); 83 if (!sdp->sd_lkstats) 84 goto fail; 85 sb->s_fs_info = sdp; 86 87 set_bit(SDF_NOJOURNALID, &sdp->sd_flags); 88 gfs2_tune_init(&sdp->sd_tune); 89 90 init_waitqueue_head(&sdp->sd_kill_wait); 91 init_waitqueue_head(&sdp->sd_async_glock_wait); 92 atomic_set(&sdp->sd_glock_disposal, 0); 93 init_completion(&sdp->sd_locking_init); 94 init_completion(&sdp->sd_wdack); 95 spin_lock_init(&sdp->sd_statfs_spin); 96 97 spin_lock_init(&sdp->sd_rindex_spin); 98 sdp->sd_rindex_tree.rb_node = NULL; 99 100 INIT_LIST_HEAD(&sdp->sd_jindex_list); 101 spin_lock_init(&sdp->sd_jindex_spin); 102 mutex_init(&sdp->sd_jindex_mutex); 103 init_completion(&sdp->sd_journal_ready); 104 105 INIT_LIST_HEAD(&sdp->sd_quota_list); 106 mutex_init(&sdp->sd_quota_mutex); 107 mutex_init(&sdp->sd_quota_sync_mutex); 108 init_waitqueue_head(&sdp->sd_quota_wait); 109 spin_lock_init(&sdp->sd_bitmap_lock); 110 111 INIT_LIST_HEAD(&sdp->sd_sc_inodes_list); 112 113 mapping = &sdp->sd_aspace; 114 115 address_space_init_once(mapping); 116 mapping->a_ops = &gfs2_rgrp_aops; 117 mapping->host = sb->s_bdev->bd_inode; 118 mapping->flags = 0; 119 mapping_set_gfp_mask(mapping, GFP_NOFS); 120 mapping->private_data = NULL; 121 mapping->writeback_index = 0; 122 123 spin_lock_init(&sdp->sd_log_lock); 124 atomic_set(&sdp->sd_log_pinned, 0); 125 INIT_LIST_HEAD(&sdp->sd_log_revokes); 126 INIT_LIST_HEAD(&sdp->sd_log_ordered); 127 spin_lock_init(&sdp->sd_ordered_lock); 128 129 init_waitqueue_head(&sdp->sd_log_waitq); 130 init_waitqueue_head(&sdp->sd_logd_waitq); 131 spin_lock_init(&sdp->sd_ail_lock); 132 INIT_LIST_HEAD(&sdp->sd_ail1_list); 133 INIT_LIST_HEAD(&sdp->sd_ail2_list); 134 135 init_rwsem(&sdp->sd_log_flush_lock); 136 atomic_set(&sdp->sd_log_in_flight, 0); 137 init_waitqueue_head(&sdp->sd_log_flush_wait); 138 mutex_init(&sdp->sd_freeze_mutex); 139 140 return sdp; 141 142 fail: 143 free_sbd(sdp); 144 return NULL; 145 } 146 147 /** 148 * gfs2_check_sb - Check superblock 149 * @sdp: the filesystem 150 * @silent: Don't print a message if the check fails 151 * 152 * Checks the version code of the FS is one that we understand how to 153 * read and that the sizes of the various on-disk structures have not 154 * changed. 155 */ 156 157 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 158 { 159 struct gfs2_sb_host *sb = &sdp->sd_sb; 160 161 if (sb->sb_magic != GFS2_MAGIC || 162 sb->sb_type != GFS2_METATYPE_SB) { 163 if (!silent) 164 pr_warn("not a GFS2 filesystem\n"); 165 return -EINVAL; 166 } 167 168 if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN || 169 sb->sb_fs_format > GFS2_FS_FORMAT_MAX || 170 sb->sb_multihost_format != GFS2_FORMAT_MULTI) { 171 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 172 return -EINVAL; 173 } 174 175 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE || 176 (sb->sb_bsize & (sb->sb_bsize - 1))) { 177 pr_warn("Invalid block size\n"); 178 return -EINVAL; 179 } 180 if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) { 181 pr_warn("Invalid block size shift\n"); 182 return -EINVAL; 183 } 184 return 0; 185 } 186 187 static void end_bio_io_page(struct bio *bio) 188 { 189 struct page *page = bio->bi_private; 190 191 if (!bio->bi_status) 192 SetPageUptodate(page); 193 else 194 pr_warn("error %d reading superblock\n", bio->bi_status); 195 unlock_page(page); 196 } 197 198 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 199 { 200 struct gfs2_sb_host *sb = &sdp->sd_sb; 201 struct super_block *s = sdp->sd_vfs; 202 const struct gfs2_sb *str = buf; 203 204 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 205 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 206 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 207 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 208 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 209 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 210 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 211 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 212 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 213 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 214 215 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 216 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 217 memcpy(&s->s_uuid, str->sb_uuid, 16); 218 } 219 220 /** 221 * gfs2_read_super - Read the gfs2 super block from disk 222 * @sdp: The GFS2 super block 223 * @sector: The location of the super block 224 * @silent: Don't print a message if the check fails 225 * 226 * This uses the bio functions to read the super block from disk 227 * because we want to be 100% sure that we never read cached data. 228 * A super block is read twice only during each GFS2 mount and is 229 * never written to by the filesystem. The first time its read no 230 * locks are held, and the only details which are looked at are those 231 * relating to the locking protocol. Once locking is up and working, 232 * the sb is read again under the lock to establish the location of 233 * the master directory (contains pointers to journals etc) and the 234 * root directory. 235 * 236 * Returns: 0 on success or error 237 */ 238 239 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 240 { 241 struct super_block *sb = sdp->sd_vfs; 242 struct gfs2_sb *p; 243 struct page *page; 244 struct bio *bio; 245 246 page = alloc_page(GFP_NOFS); 247 if (unlikely(!page)) 248 return -ENOMEM; 249 250 ClearPageUptodate(page); 251 ClearPageDirty(page); 252 lock_page(page); 253 254 bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS); 255 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 256 __bio_add_page(bio, page, PAGE_SIZE, 0); 257 258 bio->bi_end_io = end_bio_io_page; 259 bio->bi_private = page; 260 submit_bio(bio); 261 wait_on_page_locked(page); 262 bio_put(bio); 263 if (!PageUptodate(page)) { 264 __free_page(page); 265 return -EIO; 266 } 267 p = kmap(page); 268 gfs2_sb_in(sdp, p); 269 kunmap(page); 270 __free_page(page); 271 return gfs2_check_sb(sdp, silent); 272 } 273 274 /** 275 * gfs2_read_sb - Read super block 276 * @sdp: The GFS2 superblock 277 * @silent: Don't print message if mount fails 278 * 279 */ 280 281 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 282 { 283 u32 hash_blocks, ind_blocks, leaf_blocks; 284 u32 tmp_blocks; 285 unsigned int x; 286 int error; 287 288 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 289 if (error) { 290 if (!silent) 291 fs_err(sdp, "can't read superblock\n"); 292 return error; 293 } 294 295 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 296 GFS2_BASIC_BLOCK_SHIFT; 297 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 298 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 299 sizeof(struct gfs2_dinode)) / sizeof(u64); 300 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 301 sizeof(struct gfs2_meta_header)) / sizeof(u64); 302 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize - 303 sizeof(struct gfs2_log_descriptor)) / sizeof(u64); 304 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 305 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 306 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 307 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 308 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 309 sizeof(struct gfs2_meta_header)) / 310 sizeof(struct gfs2_quota_change); 311 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 312 sizeof(struct gfs2_meta_header)) 313 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 314 315 /* 316 * We always keep at least one block reserved for revokes in 317 * transactions. This greatly simplifies allocating additional 318 * revoke blocks. 319 */ 320 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs); 321 322 /* Compute maximum reservation required to add a entry to a directory */ 323 324 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 325 sdp->sd_jbsize); 326 327 ind_blocks = 0; 328 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 329 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 330 ind_blocks += tmp_blocks; 331 } 332 333 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 334 335 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 336 337 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 338 sizeof(struct gfs2_dinode); 339 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 340 for (x = 2;; x++) { 341 u64 space, d; 342 u32 m; 343 344 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 345 d = space; 346 m = do_div(d, sdp->sd_inptrs); 347 348 if (d != sdp->sd_heightsize[x - 1] || m) 349 break; 350 sdp->sd_heightsize[x] = space; 351 } 352 sdp->sd_max_height = x; 353 sdp->sd_heightsize[x] = ~0; 354 gfs2_assert(sdp, sdp->sd_max_height <= 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 BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN); 387 388 strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN); 389 strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN); 390 391 table = sdp->sd_table_name; 392 while ((table = strchr(table, '/'))) 393 *table = '_'; 394 395 return error; 396 } 397 398 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 399 int undo) 400 { 401 int error = 0; 402 403 if (undo) 404 goto fail_trans; 405 406 error = gfs2_glock_nq_num(sdp, 407 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 408 LM_ST_EXCLUSIVE, 409 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID, 410 mount_gh); 411 if (error) { 412 fs_err(sdp, "can't acquire mount glock: %d\n", error); 413 goto fail; 414 } 415 416 error = gfs2_glock_nq_num(sdp, 417 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 418 LM_ST_SHARED, 419 LM_FLAG_NOEXP | GL_EXACT | GL_NOPID, 420 &sdp->sd_live_gh); 421 if (error) { 422 fs_err(sdp, "can't acquire live glock: %d\n", error); 423 goto fail_mount; 424 } 425 426 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 427 CREATE, &sdp->sd_rename_gl); 428 if (error) { 429 fs_err(sdp, "can't create rename glock: %d\n", error); 430 goto fail_live; 431 } 432 433 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 434 CREATE, &sdp->sd_freeze_gl); 435 if (error) { 436 fs_err(sdp, "can't create freeze glock: %d\n", error); 437 goto fail_rename; 438 } 439 440 return 0; 441 442 fail_trans: 443 gfs2_glock_put(sdp->sd_freeze_gl); 444 fail_rename: 445 gfs2_glock_put(sdp->sd_rename_gl); 446 fail_live: 447 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 448 fail_mount: 449 gfs2_glock_dq_uninit(mount_gh); 450 fail: 451 return error; 452 } 453 454 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 455 u64 no_addr, const char *name) 456 { 457 struct gfs2_sbd *sdp = sb->s_fs_info; 458 struct dentry *dentry; 459 struct inode *inode; 460 461 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 462 GFS2_BLKST_FREE /* ignore */); 463 if (IS_ERR(inode)) { 464 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 465 return PTR_ERR(inode); 466 } 467 dentry = d_make_root(inode); 468 if (!dentry) { 469 fs_err(sdp, "can't alloc %s dentry\n", name); 470 return -ENOMEM; 471 } 472 *dptr = dentry; 473 return 0; 474 } 475 476 static int init_sb(struct gfs2_sbd *sdp, int silent) 477 { 478 struct super_block *sb = sdp->sd_vfs; 479 struct gfs2_holder sb_gh; 480 u64 no_addr; 481 int ret; 482 483 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 484 LM_ST_SHARED, 0, &sb_gh); 485 if (ret) { 486 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 487 return ret; 488 } 489 490 ret = gfs2_read_sb(sdp, silent); 491 if (ret) { 492 fs_err(sdp, "can't read superblock: %d\n", ret); 493 goto out; 494 } 495 496 switch(sdp->sd_sb.sb_fs_format) { 497 case GFS2_FS_FORMAT_MAX: 498 sb->s_xattr = gfs2_xattr_handlers_max; 499 break; 500 501 case GFS2_FS_FORMAT_MIN: 502 sb->s_xattr = gfs2_xattr_handlers_min; 503 break; 504 505 default: 506 BUG(); 507 } 508 509 /* Set up the buffer cache and SB for real */ 510 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 511 ret = -EINVAL; 512 fs_err(sdp, "FS block size (%u) is too small for device " 513 "block size (%u)\n", 514 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 515 goto out; 516 } 517 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 518 ret = -EINVAL; 519 fs_err(sdp, "FS block size (%u) is too big for machine " 520 "page size (%u)\n", 521 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 522 goto out; 523 } 524 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 525 526 /* Get the root inode */ 527 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 528 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 529 if (ret) 530 goto out; 531 532 /* Get the master inode */ 533 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 534 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 535 if (ret) { 536 dput(sdp->sd_root_dir); 537 goto out; 538 } 539 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 540 out: 541 gfs2_glock_dq_uninit(&sb_gh); 542 return ret; 543 } 544 545 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 546 { 547 char *message = "FIRSTMOUNT=Done"; 548 char *envp[] = { message, NULL }; 549 550 fs_info(sdp, "first mount done, others may mount\n"); 551 552 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 553 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 554 555 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 556 } 557 558 /** 559 * gfs2_jindex_hold - Grab a lock on the jindex 560 * @sdp: The GFS2 superblock 561 * @ji_gh: the holder for the jindex glock 562 * 563 * Returns: errno 564 */ 565 566 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 567 { 568 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 569 struct qstr name; 570 char buf[20]; 571 struct gfs2_jdesc *jd; 572 int error; 573 574 name.name = buf; 575 576 mutex_lock(&sdp->sd_jindex_mutex); 577 578 for (;;) { 579 struct gfs2_inode *jip; 580 581 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 582 if (error) 583 break; 584 585 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 586 name.hash = gfs2_disk_hash(name.name, name.len); 587 588 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 589 if (error == -ENOENT) { 590 error = 0; 591 break; 592 } 593 594 gfs2_glock_dq_uninit(ji_gh); 595 596 if (error) 597 break; 598 599 error = -ENOMEM; 600 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 601 if (!jd) 602 break; 603 604 INIT_LIST_HEAD(&jd->extent_list); 605 INIT_LIST_HEAD(&jd->jd_revoke_list); 606 607 INIT_WORK(&jd->jd_work, gfs2_recover_func); 608 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 609 if (IS_ERR_OR_NULL(jd->jd_inode)) { 610 if (!jd->jd_inode) 611 error = -ENOENT; 612 else 613 error = PTR_ERR(jd->jd_inode); 614 kfree(jd); 615 break; 616 } 617 618 d_mark_dontcache(jd->jd_inode); 619 spin_lock(&sdp->sd_jindex_spin); 620 jd->jd_jid = sdp->sd_journals++; 621 jip = GFS2_I(jd->jd_inode); 622 jd->jd_no_addr = jip->i_no_addr; 623 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 624 spin_unlock(&sdp->sd_jindex_spin); 625 } 626 627 mutex_unlock(&sdp->sd_jindex_mutex); 628 629 return error; 630 } 631 632 /** 633 * init_statfs - look up and initialize master and local (per node) statfs inodes 634 * @sdp: The GFS2 superblock 635 * 636 * This should be called after the jindex is initialized in init_journal() and 637 * before gfs2_journal_recovery() is called because we need to be able to write 638 * to these inodes during recovery. 639 * 640 * Returns: errno 641 */ 642 static int init_statfs(struct gfs2_sbd *sdp) 643 { 644 int error = 0; 645 struct inode *master = d_inode(sdp->sd_master_dir); 646 struct inode *pn = NULL; 647 char buf[30]; 648 struct gfs2_jdesc *jd; 649 struct gfs2_inode *ip; 650 651 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 652 if (IS_ERR(sdp->sd_statfs_inode)) { 653 error = PTR_ERR(sdp->sd_statfs_inode); 654 fs_err(sdp, "can't read in statfs inode: %d\n", error); 655 goto out; 656 } 657 if (sdp->sd_args.ar_spectator) 658 goto out; 659 660 pn = gfs2_lookup_simple(master, "per_node"); 661 if (IS_ERR(pn)) { 662 error = PTR_ERR(pn); 663 fs_err(sdp, "can't find per_node directory: %d\n", error); 664 goto put_statfs; 665 } 666 667 /* For each jid, lookup the corresponding local statfs inode in the 668 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */ 669 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 670 struct local_statfs_inode *lsi = 671 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS); 672 if (!lsi) { 673 error = -ENOMEM; 674 goto free_local; 675 } 676 sprintf(buf, "statfs_change%u", jd->jd_jid); 677 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf); 678 if (IS_ERR(lsi->si_sc_inode)) { 679 error = PTR_ERR(lsi->si_sc_inode); 680 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n", 681 jd->jd_jid, error); 682 kfree(lsi); 683 goto free_local; 684 } 685 lsi->si_jid = jd->jd_jid; 686 if (jd->jd_jid == sdp->sd_jdesc->jd_jid) 687 sdp->sd_sc_inode = lsi->si_sc_inode; 688 689 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list); 690 } 691 692 iput(pn); 693 pn = NULL; 694 ip = GFS2_I(sdp->sd_sc_inode); 695 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID, 696 &sdp->sd_sc_gh); 697 if (error) { 698 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 699 goto free_local; 700 } 701 /* read in the local statfs buffer - other nodes don't change it. */ 702 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh); 703 if (error) { 704 fs_err(sdp, "Cannot read in local statfs: %d\n", error); 705 goto unlock_sd_gh; 706 } 707 return 0; 708 709 unlock_sd_gh: 710 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 711 free_local: 712 free_local_statfs_inodes(sdp); 713 iput(pn); 714 put_statfs: 715 iput(sdp->sd_statfs_inode); 716 out: 717 return error; 718 } 719 720 /* Uninitialize and free up memory used by the list of statfs inodes */ 721 static void uninit_statfs(struct gfs2_sbd *sdp) 722 { 723 if (!sdp->sd_args.ar_spectator) { 724 brelse(sdp->sd_sc_bh); 725 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 726 free_local_statfs_inodes(sdp); 727 } 728 iput(sdp->sd_statfs_inode); 729 } 730 731 static int init_journal(struct gfs2_sbd *sdp, int undo) 732 { 733 struct inode *master = d_inode(sdp->sd_master_dir); 734 struct gfs2_holder ji_gh; 735 struct gfs2_inode *ip; 736 int error = 0; 737 738 gfs2_holder_mark_uninitialized(&ji_gh); 739 if (undo) 740 goto fail_statfs; 741 742 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 743 if (IS_ERR(sdp->sd_jindex)) { 744 fs_err(sdp, "can't lookup journal index: %d\n", error); 745 return PTR_ERR(sdp->sd_jindex); 746 } 747 748 /* Load in the journal index special file */ 749 750 error = gfs2_jindex_hold(sdp, &ji_gh); 751 if (error) { 752 fs_err(sdp, "can't read journal index: %d\n", error); 753 goto fail; 754 } 755 756 error = -EUSERS; 757 if (!gfs2_jindex_size(sdp)) { 758 fs_err(sdp, "no journals!\n"); 759 goto fail_jindex; 760 } 761 762 atomic_set(&sdp->sd_log_blks_needed, 0); 763 if (sdp->sd_args.ar_spectator) { 764 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 765 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 766 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 767 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 768 } else { 769 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 770 fs_err(sdp, "can't mount journal #%u\n", 771 sdp->sd_lockstruct.ls_jid); 772 fs_err(sdp, "there are only %u journals (0 - %u)\n", 773 gfs2_jindex_size(sdp), 774 gfs2_jindex_size(sdp) - 1); 775 goto fail_jindex; 776 } 777 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 778 779 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 780 &gfs2_journal_glops, 781 LM_ST_EXCLUSIVE, 782 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID, 783 &sdp->sd_journal_gh); 784 if (error) { 785 fs_err(sdp, "can't acquire journal glock: %d\n", error); 786 goto fail_jindex; 787 } 788 789 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 790 sdp->sd_jinode_gl = ip->i_gl; 791 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 792 LM_FLAG_NOEXP | GL_EXACT | 793 GL_NOCACHE | GL_NOPID, 794 &sdp->sd_jinode_gh); 795 if (error) { 796 fs_err(sdp, "can't acquire journal inode glock: %d\n", 797 error); 798 goto fail_journal_gh; 799 } 800 801 error = gfs2_jdesc_check(sdp->sd_jdesc); 802 if (error) { 803 fs_err(sdp, "my journal (%u) is bad: %d\n", 804 sdp->sd_jdesc->jd_jid, error); 805 goto fail_jinode_gh; 806 } 807 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 808 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 809 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 810 811 /* Map the extents for this journal's blocks */ 812 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 813 } 814 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 815 816 /* Lookup statfs inodes here so journal recovery can use them. */ 817 error = init_statfs(sdp); 818 if (error) 819 goto fail_jinode_gh; 820 821 if (sdp->sd_lockstruct.ls_first) { 822 unsigned int x; 823 for (x = 0; x < sdp->sd_journals; x++) { 824 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 825 826 if (sdp->sd_args.ar_spectator) { 827 error = check_journal_clean(sdp, jd, true); 828 if (error) 829 goto fail_statfs; 830 continue; 831 } 832 error = gfs2_recover_journal(jd, true); 833 if (error) { 834 fs_err(sdp, "error recovering journal %u: %d\n", 835 x, error); 836 goto fail_statfs; 837 } 838 } 839 840 gfs2_others_may_mount(sdp); 841 } else if (!sdp->sd_args.ar_spectator) { 842 error = gfs2_recover_journal(sdp->sd_jdesc, true); 843 if (error) { 844 fs_err(sdp, "error recovering my journal: %d\n", error); 845 goto fail_statfs; 846 } 847 } 848 849 sdp->sd_log_idle = 1; 850 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 851 gfs2_glock_dq_uninit(&ji_gh); 852 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 853 return 0; 854 855 fail_statfs: 856 uninit_statfs(sdp); 857 fail_jinode_gh: 858 /* A withdraw may have done dq/uninit so now we need to check it */ 859 if (!sdp->sd_args.ar_spectator && 860 gfs2_holder_initialized(&sdp->sd_jinode_gh)) 861 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 862 fail_journal_gh: 863 if (!sdp->sd_args.ar_spectator && 864 gfs2_holder_initialized(&sdp->sd_journal_gh)) 865 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 866 fail_jindex: 867 gfs2_jindex_free(sdp); 868 if (gfs2_holder_initialized(&ji_gh)) 869 gfs2_glock_dq_uninit(&ji_gh); 870 fail: 871 iput(sdp->sd_jindex); 872 return error; 873 } 874 875 static struct lock_class_key gfs2_quota_imutex_key; 876 877 static int init_inodes(struct gfs2_sbd *sdp, int undo) 878 { 879 int error = 0; 880 struct inode *master = d_inode(sdp->sd_master_dir); 881 882 if (undo) 883 goto fail_qinode; 884 885 error = init_journal(sdp, undo); 886 complete_all(&sdp->sd_journal_ready); 887 if (error) 888 goto fail; 889 890 /* Read in the resource index inode */ 891 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 892 if (IS_ERR(sdp->sd_rindex)) { 893 error = PTR_ERR(sdp->sd_rindex); 894 fs_err(sdp, "can't get resource index inode: %d\n", error); 895 goto fail_journal; 896 } 897 sdp->sd_rindex_uptodate = 0; 898 899 /* Read in the quota inode */ 900 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 901 if (IS_ERR(sdp->sd_quota_inode)) { 902 error = PTR_ERR(sdp->sd_quota_inode); 903 fs_err(sdp, "can't get quota file inode: %d\n", error); 904 goto fail_rindex; 905 } 906 /* 907 * i_rwsem on quota files is special. Since this inode is hidden system 908 * file, we are safe to define locking ourselves. 909 */ 910 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 911 &gfs2_quota_imutex_key); 912 913 error = gfs2_rindex_update(sdp); 914 if (error) 915 goto fail_qinode; 916 917 return 0; 918 919 fail_qinode: 920 iput(sdp->sd_quota_inode); 921 fail_rindex: 922 gfs2_clear_rgrpd(sdp); 923 iput(sdp->sd_rindex); 924 fail_journal: 925 init_journal(sdp, UNDO); 926 fail: 927 return error; 928 } 929 930 static int init_per_node(struct gfs2_sbd *sdp, int undo) 931 { 932 struct inode *pn = NULL; 933 char buf[30]; 934 int error = 0; 935 struct gfs2_inode *ip; 936 struct inode *master = d_inode(sdp->sd_master_dir); 937 938 if (sdp->sd_args.ar_spectator) 939 return 0; 940 941 if (undo) 942 goto fail_qc_gh; 943 944 pn = gfs2_lookup_simple(master, "per_node"); 945 if (IS_ERR(pn)) { 946 error = PTR_ERR(pn); 947 fs_err(sdp, "can't find per_node directory: %d\n", error); 948 return error; 949 } 950 951 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 952 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 953 if (IS_ERR(sdp->sd_qc_inode)) { 954 error = PTR_ERR(sdp->sd_qc_inode); 955 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 956 goto fail_ut_i; 957 } 958 959 iput(pn); 960 pn = NULL; 961 962 ip = GFS2_I(sdp->sd_qc_inode); 963 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID, 964 &sdp->sd_qc_gh); 965 if (error) { 966 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 967 goto fail_qc_i; 968 } 969 970 return 0; 971 972 fail_qc_gh: 973 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 974 fail_qc_i: 975 iput(sdp->sd_qc_inode); 976 fail_ut_i: 977 iput(pn); 978 return error; 979 } 980 981 static const match_table_t nolock_tokens = { 982 { Opt_jid, "jid=%d", }, 983 { Opt_err, NULL }, 984 }; 985 986 static const struct lm_lockops nolock_ops = { 987 .lm_proto_name = "lock_nolock", 988 .lm_put_lock = gfs2_glock_free, 989 .lm_tokens = &nolock_tokens, 990 }; 991 992 /** 993 * gfs2_lm_mount - mount a locking protocol 994 * @sdp: the filesystem 995 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 996 * 997 * Returns: errno 998 */ 999 1000 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 1001 { 1002 const struct lm_lockops *lm; 1003 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 1004 struct gfs2_args *args = &sdp->sd_args; 1005 const char *proto = sdp->sd_proto_name; 1006 const char *table = sdp->sd_table_name; 1007 char *o, *options; 1008 int ret; 1009 1010 if (!strcmp("lock_nolock", proto)) { 1011 lm = &nolock_ops; 1012 sdp->sd_args.ar_localflocks = 1; 1013 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 1014 } else if (!strcmp("lock_dlm", proto)) { 1015 lm = &gfs2_dlm_ops; 1016 #endif 1017 } else { 1018 pr_info("can't find protocol %s\n", proto); 1019 return -ENOENT; 1020 } 1021 1022 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 1023 1024 ls->ls_ops = lm; 1025 ls->ls_first = 1; 1026 1027 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 1028 substring_t tmp[MAX_OPT_ARGS]; 1029 int token, option; 1030 1031 if (!o || !*o) 1032 continue; 1033 1034 token = match_token(o, *lm->lm_tokens, tmp); 1035 switch (token) { 1036 case Opt_jid: 1037 ret = match_int(&tmp[0], &option); 1038 if (ret || option < 0) 1039 goto hostdata_error; 1040 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 1041 ls->ls_jid = option; 1042 break; 1043 case Opt_id: 1044 case Opt_nodir: 1045 /* Obsolete, but left for backward compat purposes */ 1046 break; 1047 case Opt_first: 1048 ret = match_int(&tmp[0], &option); 1049 if (ret || (option != 0 && option != 1)) 1050 goto hostdata_error; 1051 ls->ls_first = option; 1052 break; 1053 case Opt_err: 1054 default: 1055 hostdata_error: 1056 fs_info(sdp, "unknown hostdata (%s)\n", o); 1057 return -EINVAL; 1058 } 1059 } 1060 1061 if (lm->lm_mount == NULL) { 1062 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format); 1063 complete_all(&sdp->sd_locking_init); 1064 return 0; 1065 } 1066 ret = lm->lm_mount(sdp, table); 1067 if (ret == 0) 1068 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n", 1069 sdp->sd_sb.sb_fs_format); 1070 complete_all(&sdp->sd_locking_init); 1071 return ret; 1072 } 1073 1074 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1075 { 1076 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1077 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount) 1078 lm->lm_unmount(sdp); 1079 } 1080 1081 static int wait_on_journal(struct gfs2_sbd *sdp) 1082 { 1083 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1084 return 0; 1085 1086 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1087 ? -EINTR : 0; 1088 } 1089 1090 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1091 { 1092 struct super_block *sb = sdp->sd_vfs; 1093 char ro[20]; 1094 char spectator[20]; 1095 char *envp[] = { ro, spectator, NULL }; 1096 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1097 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1098 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1099 } 1100 1101 static int init_threads(struct gfs2_sbd *sdp) 1102 { 1103 struct task_struct *p; 1104 int error = 0; 1105 1106 p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname); 1107 if (IS_ERR(p)) { 1108 error = PTR_ERR(p); 1109 fs_err(sdp, "can't create logd thread: %d\n", error); 1110 return error; 1111 } 1112 get_task_struct(p); 1113 sdp->sd_logd_process = p; 1114 1115 p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname); 1116 if (IS_ERR(p)) { 1117 error = PTR_ERR(p); 1118 fs_err(sdp, "can't create quotad thread: %d\n", error); 1119 goto fail; 1120 } 1121 get_task_struct(p); 1122 sdp->sd_quotad_process = p; 1123 1124 wake_up_process(sdp->sd_logd_process); 1125 wake_up_process(sdp->sd_quotad_process); 1126 return 0; 1127 1128 fail: 1129 kthread_stop(sdp->sd_logd_process); 1130 put_task_struct(sdp->sd_logd_process); 1131 sdp->sd_logd_process = NULL; 1132 return error; 1133 } 1134 1135 void gfs2_destroy_threads(struct gfs2_sbd *sdp) 1136 { 1137 if (sdp->sd_logd_process) { 1138 kthread_stop(sdp->sd_logd_process); 1139 put_task_struct(sdp->sd_logd_process); 1140 sdp->sd_logd_process = NULL; 1141 } 1142 if (sdp->sd_quotad_process) { 1143 kthread_stop(sdp->sd_quotad_process); 1144 put_task_struct(sdp->sd_quotad_process); 1145 sdp->sd_quotad_process = NULL; 1146 } 1147 } 1148 1149 /** 1150 * gfs2_fill_super - Read in superblock 1151 * @sb: The VFS superblock 1152 * @fc: Mount options and flags 1153 * 1154 * Returns: -errno 1155 */ 1156 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1157 { 1158 struct gfs2_args *args = fc->fs_private; 1159 int silent = fc->sb_flags & SB_SILENT; 1160 struct gfs2_sbd *sdp; 1161 struct gfs2_holder mount_gh; 1162 int error; 1163 1164 sdp = init_sbd(sb); 1165 if (!sdp) { 1166 pr_warn("can't alloc struct gfs2_sbd\n"); 1167 return -ENOMEM; 1168 } 1169 sdp->sd_args = *args; 1170 1171 if (sdp->sd_args.ar_spectator) { 1172 sb->s_flags |= SB_RDONLY; 1173 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1174 } 1175 if (sdp->sd_args.ar_posix_acl) 1176 sb->s_flags |= SB_POSIXACL; 1177 if (sdp->sd_args.ar_nobarrier) 1178 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1179 1180 sb->s_flags |= SB_NOSEC; 1181 sb->s_magic = GFS2_MAGIC; 1182 sb->s_op = &gfs2_super_ops; 1183 sb->s_d_op = &gfs2_dops; 1184 sb->s_export_op = &gfs2_export_ops; 1185 sb->s_qcop = &gfs2_quotactl_ops; 1186 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1187 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1188 sb->s_time_gran = 1; 1189 sb->s_maxbytes = MAX_LFS_FILESIZE; 1190 1191 /* Set up the buffer cache and fill in some fake block size values 1192 to allow us to read-in the on-disk superblock. */ 1193 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1194 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1195 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1196 GFS2_BASIC_BLOCK_SHIFT; 1197 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1198 1199 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1200 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1201 if (sdp->sd_args.ar_statfs_quantum) { 1202 sdp->sd_tune.gt_statfs_slow = 0; 1203 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1204 } else { 1205 sdp->sd_tune.gt_statfs_slow = 1; 1206 sdp->sd_tune.gt_statfs_quantum = 30; 1207 } 1208 1209 error = init_names(sdp, silent); 1210 if (error) 1211 goto fail_free; 1212 1213 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1214 1215 sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s", 1216 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0, sdp->sd_fsname); 1217 error = -ENOMEM; 1218 if (!sdp->sd_delete_wq) 1219 goto fail_free; 1220 1221 error = gfs2_sys_fs_add(sdp); 1222 if (error) 1223 goto fail_delete_wq; 1224 1225 gfs2_create_debugfs_file(sdp); 1226 1227 error = gfs2_lm_mount(sdp, silent); 1228 if (error) 1229 goto fail_debug; 1230 1231 error = init_locking(sdp, &mount_gh, DO); 1232 if (error) 1233 goto fail_lm; 1234 1235 error = init_sb(sdp, silent); 1236 if (error) 1237 goto fail_locking; 1238 1239 /* Turn rgrplvb on by default if fs format is recent enough */ 1240 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801) 1241 sdp->sd_args.ar_rgrplvb = 1; 1242 1243 error = wait_on_journal(sdp); 1244 if (error) 1245 goto fail_sb; 1246 1247 /* 1248 * If user space has failed to join the cluster or some similar 1249 * failure has occurred, then the journal id will contain a 1250 * negative (error) number. This will then be returned to the 1251 * caller (of the mount syscall). We do this even for spectator 1252 * mounts (which just write a jid of 0 to indicate "ok" even though 1253 * the jid is unused in the spectator case) 1254 */ 1255 if (sdp->sd_lockstruct.ls_jid < 0) { 1256 error = sdp->sd_lockstruct.ls_jid; 1257 sdp->sd_lockstruct.ls_jid = 0; 1258 goto fail_sb; 1259 } 1260 1261 if (sdp->sd_args.ar_spectator) 1262 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1263 sdp->sd_table_name); 1264 else 1265 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1266 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1267 1268 error = init_inodes(sdp, DO); 1269 if (error) 1270 goto fail_sb; 1271 1272 error = init_per_node(sdp, DO); 1273 if (error) 1274 goto fail_inodes; 1275 1276 error = gfs2_statfs_init(sdp); 1277 if (error) { 1278 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1279 goto fail_per_node; 1280 } 1281 1282 if (!sb_rdonly(sb)) { 1283 error = init_threads(sdp); 1284 if (error) { 1285 gfs2_withdraw_delayed(sdp); 1286 goto fail_per_node; 1287 } 1288 } 1289 1290 error = gfs2_freeze_lock_shared(sdp); 1291 if (error) 1292 goto fail_per_node; 1293 1294 if (!sb_rdonly(sb)) 1295 error = gfs2_make_fs_rw(sdp); 1296 1297 if (error) { 1298 gfs2_freeze_unlock(&sdp->sd_freeze_gh); 1299 gfs2_destroy_threads(sdp); 1300 fs_err(sdp, "can't make FS RW: %d\n", error); 1301 goto fail_per_node; 1302 } 1303 gfs2_glock_dq_uninit(&mount_gh); 1304 gfs2_online_uevent(sdp); 1305 return 0; 1306 1307 fail_per_node: 1308 init_per_node(sdp, UNDO); 1309 fail_inodes: 1310 init_inodes(sdp, UNDO); 1311 fail_sb: 1312 if (sdp->sd_root_dir) 1313 dput(sdp->sd_root_dir); 1314 if (sdp->sd_master_dir) 1315 dput(sdp->sd_master_dir); 1316 if (sb->s_root) 1317 dput(sb->s_root); 1318 sb->s_root = NULL; 1319 fail_locking: 1320 init_locking(sdp, &mount_gh, UNDO); 1321 fail_lm: 1322 complete_all(&sdp->sd_journal_ready); 1323 gfs2_gl_hash_clear(sdp); 1324 gfs2_lm_unmount(sdp); 1325 fail_debug: 1326 gfs2_delete_debugfs_file(sdp); 1327 gfs2_sys_fs_del(sdp); 1328 fail_delete_wq: 1329 destroy_workqueue(sdp->sd_delete_wq); 1330 fail_free: 1331 free_sbd(sdp); 1332 sb->s_fs_info = NULL; 1333 return error; 1334 } 1335 1336 /** 1337 * gfs2_get_tree - Get the GFS2 superblock and root directory 1338 * @fc: The filesystem context 1339 * 1340 * Returns: 0 or -errno on error 1341 */ 1342 static int gfs2_get_tree(struct fs_context *fc) 1343 { 1344 struct gfs2_args *args = fc->fs_private; 1345 struct gfs2_sbd *sdp; 1346 int error; 1347 1348 error = get_tree_bdev(fc, gfs2_fill_super); 1349 if (error) 1350 return error; 1351 1352 sdp = fc->root->d_sb->s_fs_info; 1353 dput(fc->root); 1354 if (args->ar_meta) 1355 fc->root = dget(sdp->sd_master_dir); 1356 else 1357 fc->root = dget(sdp->sd_root_dir); 1358 return 0; 1359 } 1360 1361 static void gfs2_fc_free(struct fs_context *fc) 1362 { 1363 struct gfs2_args *args = fc->fs_private; 1364 1365 kfree(args); 1366 } 1367 1368 enum gfs2_param { 1369 Opt_lockproto, 1370 Opt_locktable, 1371 Opt_hostdata, 1372 Opt_spectator, 1373 Opt_ignore_local_fs, 1374 Opt_localflocks, 1375 Opt_localcaching, 1376 Opt_debug, 1377 Opt_upgrade, 1378 Opt_acl, 1379 Opt_quota, 1380 Opt_quota_flag, 1381 Opt_suiddir, 1382 Opt_data, 1383 Opt_meta, 1384 Opt_discard, 1385 Opt_commit, 1386 Opt_errors, 1387 Opt_statfs_quantum, 1388 Opt_statfs_percent, 1389 Opt_quota_quantum, 1390 Opt_barrier, 1391 Opt_rgrplvb, 1392 Opt_loccookie, 1393 }; 1394 1395 static const struct constant_table gfs2_param_quota[] = { 1396 {"off", GFS2_QUOTA_OFF}, 1397 {"account", GFS2_QUOTA_ACCOUNT}, 1398 {"on", GFS2_QUOTA_ON}, 1399 {"quiet", GFS2_QUOTA_QUIET}, 1400 {} 1401 }; 1402 1403 enum opt_data { 1404 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1405 Opt_data_ordered = GFS2_DATA_ORDERED, 1406 }; 1407 1408 static const struct constant_table gfs2_param_data[] = { 1409 {"writeback", Opt_data_writeback }, 1410 {"ordered", Opt_data_ordered }, 1411 {} 1412 }; 1413 1414 enum opt_errors { 1415 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1416 Opt_errors_panic = GFS2_ERRORS_PANIC, 1417 }; 1418 1419 static const struct constant_table gfs2_param_errors[] = { 1420 {"withdraw", Opt_errors_withdraw }, 1421 {"panic", Opt_errors_panic }, 1422 {} 1423 }; 1424 1425 static const struct fs_parameter_spec gfs2_fs_parameters[] = { 1426 fsparam_string ("lockproto", Opt_lockproto), 1427 fsparam_string ("locktable", Opt_locktable), 1428 fsparam_string ("hostdata", Opt_hostdata), 1429 fsparam_flag ("spectator", Opt_spectator), 1430 fsparam_flag ("norecovery", Opt_spectator), 1431 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1432 fsparam_flag ("localflocks", Opt_localflocks), 1433 fsparam_flag ("localcaching", Opt_localcaching), 1434 fsparam_flag_no("debug", Opt_debug), 1435 fsparam_flag ("upgrade", Opt_upgrade), 1436 fsparam_flag_no("acl", Opt_acl), 1437 fsparam_flag_no("suiddir", Opt_suiddir), 1438 fsparam_enum ("data", Opt_data, gfs2_param_data), 1439 fsparam_flag ("meta", Opt_meta), 1440 fsparam_flag_no("discard", Opt_discard), 1441 fsparam_s32 ("commit", Opt_commit), 1442 fsparam_enum ("errors", Opt_errors, gfs2_param_errors), 1443 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1444 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1445 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1446 fsparam_flag_no("barrier", Opt_barrier), 1447 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1448 fsparam_flag_no("loccookie", Opt_loccookie), 1449 /* quota can be a flag or an enum so it gets special treatment */ 1450 fsparam_flag_no("quota", Opt_quota_flag), 1451 fsparam_enum("quota", Opt_quota, gfs2_param_quota), 1452 {} 1453 }; 1454 1455 /* Parse a single mount parameter */ 1456 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1457 { 1458 struct gfs2_args *args = fc->fs_private; 1459 struct fs_parse_result result; 1460 int o; 1461 1462 o = fs_parse(fc, gfs2_fs_parameters, param, &result); 1463 if (o < 0) 1464 return o; 1465 1466 switch (o) { 1467 case Opt_lockproto: 1468 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1469 break; 1470 case Opt_locktable: 1471 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1472 break; 1473 case Opt_hostdata: 1474 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1475 break; 1476 case Opt_spectator: 1477 args->ar_spectator = 1; 1478 break; 1479 case Opt_ignore_local_fs: 1480 /* Retained for backwards compat only */ 1481 break; 1482 case Opt_localflocks: 1483 args->ar_localflocks = 1; 1484 break; 1485 case Opt_localcaching: 1486 /* Retained for backwards compat only */ 1487 break; 1488 case Opt_debug: 1489 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1490 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1491 args->ar_debug = result.boolean; 1492 break; 1493 case Opt_upgrade: 1494 /* Retained for backwards compat only */ 1495 break; 1496 case Opt_acl: 1497 args->ar_posix_acl = result.boolean; 1498 break; 1499 case Opt_quota_flag: 1500 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; 1501 break; 1502 case Opt_quota: 1503 args->ar_quota = result.int_32; 1504 break; 1505 case Opt_suiddir: 1506 args->ar_suiddir = result.boolean; 1507 break; 1508 case Opt_data: 1509 /* The uint_32 result maps directly to GFS2_DATA_* */ 1510 args->ar_data = result.uint_32; 1511 break; 1512 case Opt_meta: 1513 args->ar_meta = 1; 1514 break; 1515 case Opt_discard: 1516 args->ar_discard = result.boolean; 1517 break; 1518 case Opt_commit: 1519 if (result.int_32 <= 0) 1520 return invalfc(fc, "commit mount option requires a positive numeric argument"); 1521 args->ar_commit = result.int_32; 1522 break; 1523 case Opt_statfs_quantum: 1524 if (result.int_32 < 0) 1525 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); 1526 args->ar_statfs_quantum = result.int_32; 1527 break; 1528 case Opt_quota_quantum: 1529 if (result.int_32 <= 0) 1530 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); 1531 args->ar_quota_quantum = result.int_32; 1532 break; 1533 case Opt_statfs_percent: 1534 if (result.int_32 < 0 || result.int_32 > 100) 1535 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); 1536 args->ar_statfs_percent = result.int_32; 1537 break; 1538 case Opt_errors: 1539 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1540 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1541 args->ar_errors = result.uint_32; 1542 break; 1543 case Opt_barrier: 1544 args->ar_nobarrier = result.boolean; 1545 break; 1546 case Opt_rgrplvb: 1547 args->ar_rgrplvb = result.boolean; 1548 args->ar_got_rgrplvb = 1; 1549 break; 1550 case Opt_loccookie: 1551 args->ar_loccookie = result.boolean; 1552 break; 1553 default: 1554 return invalfc(fc, "invalid mount option: %s", param->key); 1555 } 1556 return 0; 1557 } 1558 1559 static int gfs2_reconfigure(struct fs_context *fc) 1560 { 1561 struct super_block *sb = fc->root->d_sb; 1562 struct gfs2_sbd *sdp = sb->s_fs_info; 1563 struct gfs2_args *oldargs = &sdp->sd_args; 1564 struct gfs2_args *newargs = fc->fs_private; 1565 struct gfs2_tune *gt = &sdp->sd_tune; 1566 int error = 0; 1567 1568 sync_filesystem(sb); 1569 1570 spin_lock(>->gt_spin); 1571 oldargs->ar_commit = gt->gt_logd_secs; 1572 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1573 if (gt->gt_statfs_slow) 1574 oldargs->ar_statfs_quantum = 0; 1575 else 1576 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1577 spin_unlock(>->gt_spin); 1578 1579 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1580 errorfc(fc, "reconfiguration of locking protocol not allowed"); 1581 return -EINVAL; 1582 } 1583 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1584 errorfc(fc, "reconfiguration of lock table not allowed"); 1585 return -EINVAL; 1586 } 1587 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1588 errorfc(fc, "reconfiguration of host data not allowed"); 1589 return -EINVAL; 1590 } 1591 if (newargs->ar_spectator != oldargs->ar_spectator) { 1592 errorfc(fc, "reconfiguration of spectator mode not allowed"); 1593 return -EINVAL; 1594 } 1595 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1596 errorfc(fc, "reconfiguration of localflocks not allowed"); 1597 return -EINVAL; 1598 } 1599 if (newargs->ar_meta != oldargs->ar_meta) { 1600 errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); 1601 return -EINVAL; 1602 } 1603 if (oldargs->ar_spectator) 1604 fc->sb_flags |= SB_RDONLY; 1605 1606 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1607 if (fc->sb_flags & SB_RDONLY) { 1608 gfs2_make_fs_ro(sdp); 1609 } else { 1610 error = gfs2_make_fs_rw(sdp); 1611 if (error) 1612 errorfc(fc, "unable to remount read-write"); 1613 } 1614 } 1615 sdp->sd_args = *newargs; 1616 1617 if (sdp->sd_args.ar_posix_acl) 1618 sb->s_flags |= SB_POSIXACL; 1619 else 1620 sb->s_flags &= ~SB_POSIXACL; 1621 if (sdp->sd_args.ar_nobarrier) 1622 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1623 else 1624 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1625 spin_lock(>->gt_spin); 1626 gt->gt_logd_secs = newargs->ar_commit; 1627 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1628 if (newargs->ar_statfs_quantum) { 1629 gt->gt_statfs_slow = 0; 1630 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1631 } 1632 else { 1633 gt->gt_statfs_slow = 1; 1634 gt->gt_statfs_quantum = 30; 1635 } 1636 spin_unlock(>->gt_spin); 1637 1638 gfs2_online_uevent(sdp); 1639 return error; 1640 } 1641 1642 static const struct fs_context_operations gfs2_context_ops = { 1643 .free = gfs2_fc_free, 1644 .parse_param = gfs2_parse_param, 1645 .get_tree = gfs2_get_tree, 1646 .reconfigure = gfs2_reconfigure, 1647 }; 1648 1649 /* Set up the filesystem mount context */ 1650 static int gfs2_init_fs_context(struct fs_context *fc) 1651 { 1652 struct gfs2_args *args; 1653 1654 args = kmalloc(sizeof(*args), GFP_KERNEL); 1655 if (args == NULL) 1656 return -ENOMEM; 1657 1658 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1659 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1660 1661 *args = sdp->sd_args; 1662 } else { 1663 memset(args, 0, sizeof(*args)); 1664 args->ar_quota = GFS2_QUOTA_DEFAULT; 1665 args->ar_data = GFS2_DATA_DEFAULT; 1666 args->ar_commit = 30; 1667 args->ar_statfs_quantum = 30; 1668 args->ar_quota_quantum = 60; 1669 args->ar_errors = GFS2_ERRORS_DEFAULT; 1670 } 1671 fc->fs_private = args; 1672 fc->ops = &gfs2_context_ops; 1673 return 0; 1674 } 1675 1676 static int set_meta_super(struct super_block *s, struct fs_context *fc) 1677 { 1678 return -EINVAL; 1679 } 1680 1681 static int test_meta_super(struct super_block *s, struct fs_context *fc) 1682 { 1683 return (fc->sget_key == s->s_bdev); 1684 } 1685 1686 static int gfs2_meta_get_tree(struct fs_context *fc) 1687 { 1688 struct super_block *s; 1689 struct gfs2_sbd *sdp; 1690 struct path path; 1691 int error; 1692 1693 if (!fc->source || !*fc->source) 1694 return -EINVAL; 1695 1696 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1697 if (error) { 1698 pr_warn("path_lookup on %s returned error %d\n", 1699 fc->source, error); 1700 return error; 1701 } 1702 fc->fs_type = &gfs2_fs_type; 1703 fc->sget_key = path.dentry->d_sb->s_bdev; 1704 s = sget_fc(fc, test_meta_super, set_meta_super); 1705 path_put(&path); 1706 if (IS_ERR(s)) { 1707 pr_warn("gfs2 mount does not exist\n"); 1708 return PTR_ERR(s); 1709 } 1710 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1711 deactivate_locked_super(s); 1712 return -EBUSY; 1713 } 1714 sdp = s->s_fs_info; 1715 fc->root = dget(sdp->sd_master_dir); 1716 return 0; 1717 } 1718 1719 static const struct fs_context_operations gfs2_meta_context_ops = { 1720 .free = gfs2_fc_free, 1721 .get_tree = gfs2_meta_get_tree, 1722 }; 1723 1724 static int gfs2_meta_init_fs_context(struct fs_context *fc) 1725 { 1726 int ret = gfs2_init_fs_context(fc); 1727 1728 if (ret) 1729 return ret; 1730 1731 fc->ops = &gfs2_meta_context_ops; 1732 return 0; 1733 } 1734 1735 /** 1736 * gfs2_evict_inodes - evict inodes cooperatively 1737 * @sb: the superblock 1738 * 1739 * When evicting an inode with a zero link count, we are trying to upgrade the 1740 * inode's iopen glock from SH to EX mode in order to determine if we can 1741 * delete the inode. The other nodes are supposed to evict the inode from 1742 * their caches if they can, and to poke the inode's inode glock if they cannot 1743 * do so. Either behavior allows gfs2_upgrade_iopen_glock() to proceed 1744 * quickly, but if the other nodes are not cooperating, the lock upgrading 1745 * attempt will time out. Since inodes are evicted sequentially, this can add 1746 * up quickly. 1747 * 1748 * Function evict_inodes() tries to keep the s_inode_list_lock list locked over 1749 * a long time, which prevents other inodes from being evicted concurrently. 1750 * This precludes the cooperative behavior we are looking for. This special 1751 * version of evict_inodes() avoids that. 1752 * 1753 * Modeled after drop_pagecache_sb(). 1754 */ 1755 static void gfs2_evict_inodes(struct super_block *sb) 1756 { 1757 struct inode *inode, *toput_inode = NULL; 1758 struct gfs2_sbd *sdp = sb->s_fs_info; 1759 1760 set_bit(SDF_EVICTING, &sdp->sd_flags); 1761 1762 spin_lock(&sb->s_inode_list_lock); 1763 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 1764 spin_lock(&inode->i_lock); 1765 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) && 1766 !need_resched()) { 1767 spin_unlock(&inode->i_lock); 1768 continue; 1769 } 1770 atomic_inc(&inode->i_count); 1771 spin_unlock(&inode->i_lock); 1772 spin_unlock(&sb->s_inode_list_lock); 1773 1774 iput(toput_inode); 1775 toput_inode = inode; 1776 1777 cond_resched(); 1778 spin_lock(&sb->s_inode_list_lock); 1779 } 1780 spin_unlock(&sb->s_inode_list_lock); 1781 iput(toput_inode); 1782 } 1783 1784 static void gfs2_kill_sb(struct super_block *sb) 1785 { 1786 struct gfs2_sbd *sdp = sb->s_fs_info; 1787 1788 if (sdp == NULL) { 1789 kill_block_super(sb); 1790 return; 1791 } 1792 1793 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1794 dput(sdp->sd_root_dir); 1795 dput(sdp->sd_master_dir); 1796 sdp->sd_root_dir = NULL; 1797 sdp->sd_master_dir = NULL; 1798 shrink_dcache_sb(sb); 1799 1800 gfs2_evict_inodes(sb); 1801 1802 /* 1803 * Flush and then drain the delete workqueue here (via 1804 * destroy_workqueue()) to ensure that any delete work that 1805 * may be running will also see the SDF_KILL flag. 1806 */ 1807 set_bit(SDF_KILL, &sdp->sd_flags); 1808 gfs2_flush_delete_work(sdp); 1809 destroy_workqueue(sdp->sd_delete_wq); 1810 1811 kill_block_super(sb); 1812 } 1813 1814 struct file_system_type gfs2_fs_type = { 1815 .name = "gfs2", 1816 .fs_flags = FS_REQUIRES_DEV, 1817 .init_fs_context = gfs2_init_fs_context, 1818 .parameters = gfs2_fs_parameters, 1819 .kill_sb = gfs2_kill_sb, 1820 .owner = THIS_MODULE, 1821 }; 1822 MODULE_ALIAS_FS("gfs2"); 1823 1824 struct file_system_type gfs2meta_fs_type = { 1825 .name = "gfs2meta", 1826 .fs_flags = FS_REQUIRES_DEV, 1827 .init_fs_context = gfs2_meta_init_fs_context, 1828 .owner = THIS_MODULE, 1829 }; 1830 MODULE_ALIAS_FS("gfs2meta"); 1831