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 53static void gfs2_tune_init(struct gfs2_tune *gt) 54{ 55 spin_lock_init(>->gt_spin); 56 57 gt->gt_quota_warn_period = 10; 58 gt->gt_quota_scale_num = 1; 59 gt->gt_quota_scale_den = 1; 60 gt->gt_new_files_jdata = 0; 61 gt->gt_max_readahead = BIT(18); 62 gt->gt_complain_secs = 10; 63} 64 65void free_sbd(struct gfs2_sbd *sdp) 66{ 67 if (sdp->sd_lkstats) 68 free_percpu(sdp->sd_lkstats); 69 kfree(sdp); 70} 71 72static 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->i_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 142fail: 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 157static 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 187static 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 198static 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 super_set_uuid(s, 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 239static 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 281static 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 - 9; 296 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 297 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 298 sizeof(struct gfs2_dinode)) / sizeof(u64); 299 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 300 sizeof(struct gfs2_meta_header)) / sizeof(u64); 301 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize - 302 sizeof(struct gfs2_log_descriptor)) / sizeof(u64); 303 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 304 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 305 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 306 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 307 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 308 sizeof(struct gfs2_meta_header)) / 309 sizeof(struct gfs2_quota_change); 310 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 311 sizeof(struct gfs2_meta_header)) 312 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 313 314 /* 315 * We always keep at least one block reserved for revokes in 316 * transactions. This greatly simplifies allocating additional 317 * revoke blocks. 318 */ 319 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs); 320 321 /* Compute maximum reservation required to add a entry to a directory */ 322 323 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 324 sdp->sd_jbsize); 325 326 ind_blocks = 0; 327 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 328 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 329 ind_blocks += tmp_blocks; 330 } 331 332 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 333 334 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 335 336 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 337 sizeof(struct gfs2_dinode); 338 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 339 for (x = 2;; x++) { 340 u64 space, d; 341 u32 m; 342 343 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 344 d = space; 345 m = do_div(d, sdp->sd_inptrs); 346 347 if (d != sdp->sd_heightsize[x - 1] || m) 348 break; 349 sdp->sd_heightsize[x] = space; 350 } 351 sdp->sd_max_height = x; 352 sdp->sd_heightsize[x] = ~0; 353 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 354 355 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 356 sizeof(struct gfs2_leaf)) / 357 GFS2_MIN_DIRENT_SIZE; 358 return 0; 359} 360 361static int init_names(struct gfs2_sbd *sdp, int silent) 362{ 363 char *proto, *table; 364 int error = 0; 365 366 proto = sdp->sd_args.ar_lockproto; 367 table = sdp->sd_args.ar_locktable; 368 369 /* Try to autodetect */ 370 371 if (!proto[0] || !table[0]) { 372 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 373 if (error) 374 return error; 375 376 if (!proto[0]) 377 proto = sdp->sd_sb.sb_lockproto; 378 if (!table[0]) 379 table = sdp->sd_sb.sb_locktable; 380 } 381 382 if (!table[0]) 383 table = sdp->sd_vfs->s_id; 384 385 BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN); 386 387 strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN); 388 strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN); 389 390 table = sdp->sd_table_name; 391 while ((table = strchr(table, '/'))) 392 *table = '_'; 393 394 return error; 395} 396 397static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 398 int undo) 399{ 400 int error = 0; 401 402 if (undo) 403 goto fail_trans; 404 405 error = gfs2_glock_nq_num(sdp, 406 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 407 LM_ST_EXCLUSIVE, 408 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID, 409 mount_gh); 410 if (error) { 411 fs_err(sdp, "can't acquire mount glock: %d\n", error); 412 goto fail; 413 } 414 415 error = gfs2_glock_nq_num(sdp, 416 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 417 LM_ST_SHARED, 418 LM_FLAG_NOEXP | GL_EXACT | GL_NOPID, 419 &sdp->sd_live_gh); 420 if (error) { 421 fs_err(sdp, "can't acquire live glock: %d\n", error); 422 goto fail_mount; 423 } 424 425 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 426 CREATE, &sdp->sd_rename_gl); 427 if (error) { 428 fs_err(sdp, "can't create rename glock: %d\n", error); 429 goto fail_live; 430 } 431 432 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 433 CREATE, &sdp->sd_freeze_gl); 434 if (error) { 435 fs_err(sdp, "can't create freeze glock: %d\n", error); 436 goto fail_rename; 437 } 438 439 return 0; 440 441fail_trans: 442 gfs2_glock_put(sdp->sd_freeze_gl); 443fail_rename: 444 gfs2_glock_put(sdp->sd_rename_gl); 445fail_live: 446 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 447fail_mount: 448 gfs2_glock_dq_uninit(mount_gh); 449fail: 450 return error; 451} 452 453static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 454 u64 no_addr, const char *name) 455{ 456 struct gfs2_sbd *sdp = sb->s_fs_info; 457 struct dentry *dentry; 458 struct inode *inode; 459 460 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 461 GFS2_BLKST_FREE /* ignore */); 462 if (IS_ERR(inode)) { 463 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 464 return PTR_ERR(inode); 465 } 466 dentry = d_make_root(inode); 467 if (!dentry) { 468 fs_err(sdp, "can't alloc %s dentry\n", name); 469 return -ENOMEM; 470 } 471 *dptr = dentry; 472 return 0; 473} 474 475static int init_sb(struct gfs2_sbd *sdp, int silent) 476{ 477 struct super_block *sb = sdp->sd_vfs; 478 struct gfs2_holder sb_gh; 479 u64 no_addr; 480 int ret; 481 482 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 483 LM_ST_SHARED, 0, &sb_gh); 484 if (ret) { 485 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 486 return ret; 487 } 488 489 ret = gfs2_read_sb(sdp, silent); 490 if (ret) { 491 fs_err(sdp, "can't read superblock: %d\n", ret); 492 goto out; 493 } 494 495 switch(sdp->sd_sb.sb_fs_format) { 496 case GFS2_FS_FORMAT_MAX: 497 sb->s_xattr = gfs2_xattr_handlers_max; 498 break; 499 500 case GFS2_FS_FORMAT_MIN: 501 sb->s_xattr = gfs2_xattr_handlers_min; 502 break; 503 504 default: 505 BUG(); 506 } 507 508 /* Set up the buffer cache and SB for real */ 509 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 510 ret = -EINVAL; 511 fs_err(sdp, "FS block size (%u) is too small for device " 512 "block size (%u)\n", 513 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 514 goto out; 515 } 516 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 517 ret = -EINVAL; 518 fs_err(sdp, "FS block size (%u) is too big for machine " 519 "page size (%u)\n", 520 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 521 goto out; 522 } 523 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 524 525 /* Get the root inode */ 526 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 527 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 528 if (ret) 529 goto out; 530 531 /* Get the master inode */ 532 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 533 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 534 if (ret) { 535 dput(sdp->sd_root_dir); 536 goto out; 537 } 538 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 539out: 540 gfs2_glock_dq_uninit(&sb_gh); 541 return ret; 542} 543 544static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 545{ 546 char *message = "FIRSTMOUNT=Done"; 547 char *envp[] = { message, NULL }; 548 549 fs_info(sdp, "first mount done, others may mount\n"); 550 551 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 552 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 553 554 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 555} 556 557/** 558 * gfs2_jindex_hold - Grab a lock on the jindex 559 * @sdp: The GFS2 superblock 560 * @ji_gh: the holder for the jindex glock 561 * 562 * Returns: errno 563 */ 564 565static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 566{ 567 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 568 struct qstr name; 569 char buf[20]; 570 struct gfs2_jdesc *jd; 571 int error; 572 573 name.name = buf; 574 575 mutex_lock(&sdp->sd_jindex_mutex); 576 577 for (;;) { 578 struct gfs2_inode *jip; 579 580 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 581 if (error) 582 break; 583 584 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 585 name.hash = gfs2_disk_hash(name.name, name.len); 586 587 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 588 if (error == -ENOENT) { 589 error = 0; 590 break; 591 } 592 593 gfs2_glock_dq_uninit(ji_gh); 594 595 if (error) 596 break; 597 598 error = -ENOMEM; 599 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 600 if (!jd) 601 break; 602 603 INIT_LIST_HEAD(&jd->extent_list); 604 INIT_LIST_HEAD(&jd->jd_revoke_list); 605 606 INIT_WORK(&jd->jd_work, gfs2_recover_func); 607 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 608 if (IS_ERR_OR_NULL(jd->jd_inode)) { 609 if (!jd->jd_inode) 610 error = -ENOENT; 611 else 612 error = PTR_ERR(jd->jd_inode); 613 kfree(jd); 614 break; 615 } 616 617 d_mark_dontcache(jd->jd_inode); 618 spin_lock(&sdp->sd_jindex_spin); 619 jd->jd_jid = sdp->sd_journals++; 620 jip = GFS2_I(jd->jd_inode); 621 jd->jd_no_addr = jip->i_no_addr; 622 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 623 spin_unlock(&sdp->sd_jindex_spin); 624 } 625 626 mutex_unlock(&sdp->sd_jindex_mutex); 627 628 return error; 629} 630 631/** 632 * init_statfs - look up and initialize master and local (per node) statfs inodes 633 * @sdp: The GFS2 superblock 634 * 635 * This should be called after the jindex is initialized in init_journal() and 636 * before gfs2_journal_recovery() is called because we need to be able to write 637 * to these inodes during recovery. 638 * 639 * Returns: errno 640 */ 641static int init_statfs(struct gfs2_sbd *sdp) 642{ 643 int error = 0; 644 struct inode *master = d_inode(sdp->sd_master_dir); 645 struct inode *pn = NULL; 646 char buf[30]; 647 struct gfs2_jdesc *jd; 648 struct gfs2_inode *ip; 649 650 sdp->sd_statfs_inode = gfs2_lookup_meta(master, "statfs"); 651 if (IS_ERR(sdp->sd_statfs_inode)) { 652 error = PTR_ERR(sdp->sd_statfs_inode); 653 fs_err(sdp, "can't read in statfs inode: %d\n", error); 654 goto out; 655 } 656 if (sdp->sd_args.ar_spectator) 657 goto out; 658 659 pn = gfs2_lookup_meta(master, "per_node"); 660 if (IS_ERR(pn)) { 661 error = PTR_ERR(pn); 662 fs_err(sdp, "can't find per_node directory: %d\n", error); 663 goto put_statfs; 664 } 665 666 /* For each jid, lookup the corresponding local statfs inode in the 667 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */ 668 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 669 struct local_statfs_inode *lsi = 670 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS); 671 if (!lsi) { 672 error = -ENOMEM; 673 goto free_local; 674 } 675 sprintf(buf, "statfs_change%u", jd->jd_jid); 676 lsi->si_sc_inode = gfs2_lookup_meta(pn, buf); 677 if (IS_ERR(lsi->si_sc_inode)) { 678 error = PTR_ERR(lsi->si_sc_inode); 679 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n", 680 jd->jd_jid, error); 681 kfree(lsi); 682 goto free_local; 683 } 684 lsi->si_jid = jd->jd_jid; 685 if (jd->jd_jid == sdp->sd_jdesc->jd_jid) 686 sdp->sd_sc_inode = lsi->si_sc_inode; 687 688 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list); 689 } 690 691 iput(pn); 692 pn = NULL; 693 ip = GFS2_I(sdp->sd_sc_inode); 694 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID, 695 &sdp->sd_sc_gh); 696 if (error) { 697 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 698 goto free_local; 699 } 700 /* read in the local statfs buffer - other nodes don't change it. */ 701 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh); 702 if (error) { 703 fs_err(sdp, "Cannot read in local statfs: %d\n", error); 704 goto unlock_sd_gh; 705 } 706 return 0; 707 708unlock_sd_gh: 709 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 710free_local: 711 free_local_statfs_inodes(sdp); 712 iput(pn); 713put_statfs: 714 iput(sdp->sd_statfs_inode); 715out: 716 return error; 717} 718 719/* Uninitialize and free up memory used by the list of statfs inodes */ 720static void uninit_statfs(struct gfs2_sbd *sdp) 721{ 722 if (!sdp->sd_args.ar_spectator) { 723 brelse(sdp->sd_sc_bh); 724 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 725 free_local_statfs_inodes(sdp); 726 } 727 iput(sdp->sd_statfs_inode); 728} 729 730static int init_journal(struct gfs2_sbd *sdp, int undo) 731{ 732 struct inode *master = d_inode(sdp->sd_master_dir); 733 struct gfs2_holder ji_gh; 734 struct gfs2_inode *ip; 735 int error = 0; 736 737 gfs2_holder_mark_uninitialized(&ji_gh); 738 if (undo) 739 goto fail_statfs; 740 741 sdp->sd_jindex = gfs2_lookup_meta(master, "jindex"); 742 if (IS_ERR(sdp->sd_jindex)) { 743 fs_err(sdp, "can't lookup journal index: %d\n", error); 744 return PTR_ERR(sdp->sd_jindex); 745 } 746 747 /* Load in the journal index special file */ 748 749 error = gfs2_jindex_hold(sdp, &ji_gh); 750 if (error) { 751 fs_err(sdp, "can't read journal index: %d\n", error); 752 goto fail; 753 } 754 755 error = -EUSERS; 756 if (!gfs2_jindex_size(sdp)) { 757 fs_err(sdp, "no journals!\n"); 758 goto fail_jindex; 759 } 760 761 atomic_set(&sdp->sd_log_blks_needed, 0); 762 if (sdp->sd_args.ar_spectator) { 763 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 764 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 765 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 766 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 767 } else { 768 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 769 fs_err(sdp, "can't mount journal #%u\n", 770 sdp->sd_lockstruct.ls_jid); 771 fs_err(sdp, "there are only %u journals (0 - %u)\n", 772 gfs2_jindex_size(sdp), 773 gfs2_jindex_size(sdp) - 1); 774 goto fail_jindex; 775 } 776 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 777 778 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 779 &gfs2_journal_glops, 780 LM_ST_EXCLUSIVE, 781 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID, 782 &sdp->sd_journal_gh); 783 if (error) { 784 fs_err(sdp, "can't acquire journal glock: %d\n", error); 785 goto fail_jindex; 786 } 787 788 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 789 sdp->sd_jinode_gl = ip->i_gl; 790 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 791 LM_FLAG_NOEXP | GL_EXACT | 792 GL_NOCACHE | GL_NOPID, 793 &sdp->sd_jinode_gh); 794 if (error) { 795 fs_err(sdp, "can't acquire journal inode glock: %d\n", 796 error); 797 goto fail_journal_gh; 798 } 799 800 error = gfs2_jdesc_check(sdp->sd_jdesc); 801 if (error) { 802 fs_err(sdp, "my journal (%u) is bad: %d\n", 803 sdp->sd_jdesc->jd_jid, error); 804 goto fail_jinode_gh; 805 } 806 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 807 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 808 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 809 810 /* Map the extents for this journal's blocks */ 811 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 812 } 813 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 814 815 /* Lookup statfs inodes here so journal recovery can use them. */ 816 error = init_statfs(sdp); 817 if (error) 818 goto fail_jinode_gh; 819 820 if (sdp->sd_lockstruct.ls_first) { 821 unsigned int x; 822 for (x = 0; x < sdp->sd_journals; x++) { 823 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 824 825 if (sdp->sd_args.ar_spectator) { 826 error = check_journal_clean(sdp, jd, true); 827 if (error) 828 goto fail_statfs; 829 continue; 830 } 831 error = gfs2_recover_journal(jd, true); 832 if (error) { 833 fs_err(sdp, "error recovering journal %u: %d\n", 834 x, error); 835 goto fail_statfs; 836 } 837 } 838 839 gfs2_others_may_mount(sdp); 840 } else if (!sdp->sd_args.ar_spectator) { 841 error = gfs2_recover_journal(sdp->sd_jdesc, true); 842 if (error) { 843 fs_err(sdp, "error recovering my journal: %d\n", error); 844 goto fail_statfs; 845 } 846 } 847 848 sdp->sd_log_idle = 1; 849 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 850 gfs2_glock_dq_uninit(&ji_gh); 851 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 852 return 0; 853 854fail_statfs: 855 uninit_statfs(sdp); 856fail_jinode_gh: 857 /* A withdraw may have done dq/uninit so now we need to check it */ 858 if (!sdp->sd_args.ar_spectator && 859 gfs2_holder_initialized(&sdp->sd_jinode_gh)) 860 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 861fail_journal_gh: 862 if (!sdp->sd_args.ar_spectator && 863 gfs2_holder_initialized(&sdp->sd_journal_gh)) 864 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 865fail_jindex: 866 gfs2_jindex_free(sdp); 867 if (gfs2_holder_initialized(&ji_gh)) 868 gfs2_glock_dq_uninit(&ji_gh); 869fail: 870 iput(sdp->sd_jindex); 871 return error; 872} 873 874static struct lock_class_key gfs2_quota_imutex_key; 875 876static int init_inodes(struct gfs2_sbd *sdp, int undo) 877{ 878 int error = 0; 879 struct inode *master = d_inode(sdp->sd_master_dir); 880 881 if (undo) 882 goto fail_qinode; 883 884 error = init_journal(sdp, undo); 885 complete_all(&sdp->sd_journal_ready); 886 if (error) 887 goto fail; 888 889 /* Read in the resource index inode */ 890 sdp->sd_rindex = gfs2_lookup_meta(master, "rindex"); 891 if (IS_ERR(sdp->sd_rindex)) { 892 error = PTR_ERR(sdp->sd_rindex); 893 fs_err(sdp, "can't get resource index inode: %d\n", error); 894 goto fail_journal; 895 } 896 sdp->sd_rindex_uptodate = 0; 897 898 /* Read in the quota inode */ 899 sdp->sd_quota_inode = gfs2_lookup_meta(master, "quota"); 900 if (IS_ERR(sdp->sd_quota_inode)) { 901 error = PTR_ERR(sdp->sd_quota_inode); 902 fs_err(sdp, "can't get quota file inode: %d\n", error); 903 goto fail_rindex; 904 } 905 /* 906 * i_rwsem on quota files is special. Since this inode is hidden system 907 * file, we are safe to define locking ourselves. 908 */ 909 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 910 &gfs2_quota_imutex_key); 911 912 error = gfs2_rindex_update(sdp); 913 if (error) 914 goto fail_qinode; 915 916 return 0; 917 918fail_qinode: 919 iput(sdp->sd_quota_inode); 920fail_rindex: 921 gfs2_clear_rgrpd(sdp); 922 iput(sdp->sd_rindex); 923fail_journal: 924 init_journal(sdp, UNDO); 925fail: 926 return error; 927} 928 929static int init_per_node(struct gfs2_sbd *sdp, int undo) 930{ 931 struct inode *pn = NULL; 932 char buf[30]; 933 int error = 0; 934 struct gfs2_inode *ip; 935 struct inode *master = d_inode(sdp->sd_master_dir); 936 937 if (sdp->sd_args.ar_spectator) 938 return 0; 939 940 if (undo) 941 goto fail_qc_gh; 942 943 pn = gfs2_lookup_meta(master, "per_node"); 944 if (IS_ERR(pn)) { 945 error = PTR_ERR(pn); 946 fs_err(sdp, "can't find per_node directory: %d\n", error); 947 return error; 948 } 949 950 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 951 sdp->sd_qc_inode = gfs2_lookup_meta(pn, buf); 952 if (IS_ERR(sdp->sd_qc_inode)) { 953 error = PTR_ERR(sdp->sd_qc_inode); 954 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 955 goto fail_ut_i; 956 } 957 958 iput(pn); 959 pn = NULL; 960 961 ip = GFS2_I(sdp->sd_qc_inode); 962 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID, 963 &sdp->sd_qc_gh); 964 if (error) { 965 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 966 goto fail_qc_i; 967 } 968 969 return 0; 970 971fail_qc_gh: 972 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 973fail_qc_i: 974 iput(sdp->sd_qc_inode); 975fail_ut_i: 976 iput(pn); 977 return error; 978} 979 980static const match_table_t nolock_tokens = { 981 { Opt_jid, "jid=%d", }, 982 { Opt_err, NULL }, 983}; 984 985static const struct lm_lockops nolock_ops = { 986 .lm_proto_name = "lock_nolock", 987 .lm_put_lock = gfs2_glock_free, 988 .lm_tokens = &nolock_tokens, 989}; 990 991/** 992 * gfs2_lm_mount - mount a locking protocol 993 * @sdp: the filesystem 994 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 995 * 996 * Returns: errno 997 */ 998 999static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 1000{ 1001 const struct lm_lockops *lm; 1002 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 1003 struct gfs2_args *args = &sdp->sd_args; 1004 const char *proto = sdp->sd_proto_name; 1005 const char *table = sdp->sd_table_name; 1006 char *o, *options; 1007 int ret; 1008 1009 if (!strcmp("lock_nolock", proto)) { 1010 lm = &nolock_ops; 1011 sdp->sd_args.ar_localflocks = 1; 1012#ifdef CONFIG_GFS2_FS_LOCKING_DLM 1013 } else if (!strcmp("lock_dlm", proto)) { 1014 lm = &gfs2_dlm_ops; 1015#endif 1016 } else { 1017 pr_info("can't find protocol %s\n", proto); 1018 return -ENOENT; 1019 } 1020 1021 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 1022 1023 ls->ls_ops = lm; 1024 ls->ls_first = 1; 1025 1026 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 1027 substring_t tmp[MAX_OPT_ARGS]; 1028 int token, option; 1029 1030 if (!o || !*o) 1031 continue; 1032 1033 token = match_token(o, *lm->lm_tokens, tmp); 1034 switch (token) { 1035 case Opt_jid: 1036 ret = match_int(&tmp[0], &option); 1037 if (ret || option < 0) 1038 goto hostdata_error; 1039 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 1040 ls->ls_jid = option; 1041 break; 1042 case Opt_id: 1043 case Opt_nodir: 1044 /* Obsolete, but left for backward compat purposes */ 1045 break; 1046 case Opt_first: 1047 ret = match_int(&tmp[0], &option); 1048 if (ret || (option != 0 && option != 1)) 1049 goto hostdata_error; 1050 ls->ls_first = option; 1051 break; 1052 case Opt_err: 1053 default: 1054hostdata_error: 1055 fs_info(sdp, "unknown hostdata (%s)\n", o); 1056 return -EINVAL; 1057 } 1058 } 1059 1060 if (lm->lm_mount == NULL) { 1061 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format); 1062 complete_all(&sdp->sd_locking_init); 1063 return 0; 1064 } 1065 ret = lm->lm_mount(sdp, table); 1066 if (ret == 0) 1067 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n", 1068 sdp->sd_sb.sb_fs_format); 1069 complete_all(&sdp->sd_locking_init); 1070 return ret; 1071} 1072 1073void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1074{ 1075 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1076 if (!gfs2_withdrawing_or_withdrawn(sdp) && lm->lm_unmount) 1077 lm->lm_unmount(sdp); 1078} 1079 1080static int wait_on_journal(struct gfs2_sbd *sdp) 1081{ 1082 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1083 return 0; 1084 1085 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1086 ? -EINTR : 0; 1087} 1088 1089void gfs2_online_uevent(struct gfs2_sbd *sdp) 1090{ 1091 struct super_block *sb = sdp->sd_vfs; 1092 char ro[20]; 1093 char spectator[20]; 1094 char *envp[] = { ro, spectator, NULL }; 1095 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1096 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1097 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1098} 1099 1100static int init_threads(struct gfs2_sbd *sdp) 1101{ 1102 struct task_struct *p; 1103 int error = 0; 1104 1105 p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname); 1106 if (IS_ERR(p)) { 1107 error = PTR_ERR(p); 1108 fs_err(sdp, "can't create logd thread: %d\n", error); 1109 return error; 1110 } 1111 get_task_struct(p); 1112 sdp->sd_logd_process = p; 1113 1114 p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname); 1115 if (IS_ERR(p)) { 1116 error = PTR_ERR(p); 1117 fs_err(sdp, "can't create quotad thread: %d\n", error); 1118 goto fail; 1119 } 1120 get_task_struct(p); 1121 sdp->sd_quotad_process = p; 1122 1123 wake_up_process(sdp->sd_logd_process); 1124 wake_up_process(sdp->sd_quotad_process); 1125 return 0; 1126 1127fail: 1128 kthread_stop_put(sdp->sd_logd_process); 1129 sdp->sd_logd_process = NULL; 1130 return error; 1131} 1132 1133void gfs2_destroy_threads(struct gfs2_sbd *sdp) 1134{ 1135 if (sdp->sd_logd_process) { 1136 kthread_stop_put(sdp->sd_logd_process); 1137 sdp->sd_logd_process = NULL; 1138 } 1139 if (sdp->sd_quotad_process) { 1140 kthread_stop_put(sdp->sd_quotad_process); 1141 sdp->sd_quotad_process = NULL; 1142 } 1143} 1144 1145/** 1146 * gfs2_fill_super - Read in superblock 1147 * @sb: The VFS superblock 1148 * @fc: Mount options and flags 1149 * 1150 * Returns: -errno 1151 */ 1152static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1153{ 1154 struct gfs2_args *args = fc->fs_private; 1155 int silent = fc->sb_flags & SB_SILENT; 1156 struct gfs2_sbd *sdp; 1157 struct gfs2_holder mount_gh; 1158 int error; 1159 1160 sdp = init_sbd(sb); 1161 if (!sdp) { 1162 pr_warn("can't alloc struct gfs2_sbd\n"); 1163 return -ENOMEM; 1164 } 1165 sdp->sd_args = *args; 1166 1167 if (sdp->sd_args.ar_spectator) { 1168 sb->s_flags |= SB_RDONLY; 1169 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1170 } 1171 if (sdp->sd_args.ar_posix_acl) 1172 sb->s_flags |= SB_POSIXACL; 1173 if (sdp->sd_args.ar_nobarrier) 1174 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1175 1176 sb->s_flags |= SB_NOSEC; 1177 sb->s_magic = GFS2_MAGIC; 1178 sb->s_op = &gfs2_super_ops; 1179 sb->s_d_op = &gfs2_dops; 1180 sb->s_export_op = &gfs2_export_ops; 1181 sb->s_qcop = &gfs2_quotactl_ops; 1182 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1183 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1184 sb->s_time_gran = 1; 1185 sb->s_maxbytes = MAX_LFS_FILESIZE; 1186 1187 /* Set up the buffer cache and fill in some fake block size values 1188 to allow us to read-in the on-disk superblock. */ 1189 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, 512); 1190 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1191 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 9; 1192 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1193 1194 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1195 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1196 if (sdp->sd_args.ar_statfs_quantum) { 1197 sdp->sd_tune.gt_statfs_slow = 0; 1198 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1199 } else { 1200 sdp->sd_tune.gt_statfs_slow = 1; 1201 sdp->sd_tune.gt_statfs_quantum = 30; 1202 } 1203 1204 error = init_names(sdp, silent); 1205 if (error) 1206 goto fail_free; 1207 1208 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1209 1210 sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s", 1211 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0, sdp->sd_fsname); 1212 error = -ENOMEM; 1213 if (!sdp->sd_delete_wq) 1214 goto fail_free; 1215 1216 error = gfs2_sys_fs_add(sdp); 1217 if (error) 1218 goto fail_delete_wq; 1219 1220 gfs2_create_debugfs_file(sdp); 1221 1222 error = gfs2_lm_mount(sdp, silent); 1223 if (error) 1224 goto fail_debug; 1225 1226 error = init_locking(sdp, &mount_gh, DO); 1227 if (error) 1228 goto fail_lm; 1229 1230 error = init_sb(sdp, silent); 1231 if (error) 1232 goto fail_locking; 1233 1234 /* Turn rgrplvb on by default if fs format is recent enough */ 1235 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801) 1236 sdp->sd_args.ar_rgrplvb = 1; 1237 1238 error = wait_on_journal(sdp); 1239 if (error) 1240 goto fail_sb; 1241 1242 /* 1243 * If user space has failed to join the cluster or some similar 1244 * failure has occurred, then the journal id will contain a 1245 * negative (error) number. This will then be returned to the 1246 * caller (of the mount syscall). We do this even for spectator 1247 * mounts (which just write a jid of 0 to indicate "ok" even though 1248 * the jid is unused in the spectator case) 1249 */ 1250 if (sdp->sd_lockstruct.ls_jid < 0) { 1251 error = sdp->sd_lockstruct.ls_jid; 1252 sdp->sd_lockstruct.ls_jid = 0; 1253 goto fail_sb; 1254 } 1255 1256 if (sdp->sd_args.ar_spectator) 1257 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1258 sdp->sd_table_name); 1259 else 1260 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1261 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1262 1263 error = init_inodes(sdp, DO); 1264 if (error) 1265 goto fail_sb; 1266 1267 error = init_per_node(sdp, DO); 1268 if (error) 1269 goto fail_inodes; 1270 1271 error = gfs2_statfs_init(sdp); 1272 if (error) { 1273 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1274 goto fail_per_node; 1275 } 1276 1277 if (!sb_rdonly(sb)) { 1278 error = init_threads(sdp); 1279 if (error) 1280 goto fail_per_node; 1281 } 1282 1283 error = gfs2_freeze_lock_shared(sdp); 1284 if (error) 1285 goto fail_per_node; 1286 1287 if (!sb_rdonly(sb)) 1288 error = gfs2_make_fs_rw(sdp); 1289 1290 if (error) { 1291 gfs2_freeze_unlock(&sdp->sd_freeze_gh); 1292 gfs2_destroy_threads(sdp); 1293 fs_err(sdp, "can't make FS RW: %d\n", error); 1294 goto fail_per_node; 1295 } 1296 gfs2_glock_dq_uninit(&mount_gh); 1297 gfs2_online_uevent(sdp); 1298 return 0; 1299 1300fail_per_node: 1301 init_per_node(sdp, UNDO); 1302fail_inodes: 1303 init_inodes(sdp, UNDO); 1304fail_sb: 1305 if (sdp->sd_root_dir) 1306 dput(sdp->sd_root_dir); 1307 if (sdp->sd_master_dir) 1308 dput(sdp->sd_master_dir); 1309 if (sb->s_root) 1310 dput(sb->s_root); 1311 sb->s_root = NULL; 1312fail_locking: 1313 init_locking(sdp, &mount_gh, UNDO); 1314fail_lm: 1315 complete_all(&sdp->sd_journal_ready); 1316 gfs2_gl_hash_clear(sdp); 1317 gfs2_lm_unmount(sdp); 1318fail_debug: 1319 gfs2_delete_debugfs_file(sdp); 1320 gfs2_sys_fs_del(sdp); 1321fail_delete_wq: 1322 destroy_workqueue(sdp->sd_delete_wq); 1323fail_free: 1324 free_sbd(sdp); 1325 sb->s_fs_info = NULL; 1326 return error; 1327} 1328 1329/** 1330 * gfs2_get_tree - Get the GFS2 superblock and root directory 1331 * @fc: The filesystem context 1332 * 1333 * Returns: 0 or -errno on error 1334 */ 1335static int gfs2_get_tree(struct fs_context *fc) 1336{ 1337 struct gfs2_args *args = fc->fs_private; 1338 struct gfs2_sbd *sdp; 1339 int error; 1340 1341 error = get_tree_bdev(fc, gfs2_fill_super); 1342 if (error) 1343 return error; 1344 1345 sdp = fc->root->d_sb->s_fs_info; 1346 dput(fc->root); 1347 if (args->ar_meta) 1348 fc->root = dget(sdp->sd_master_dir); 1349 else 1350 fc->root = dget(sdp->sd_root_dir); 1351 return 0; 1352} 1353 1354static void gfs2_fc_free(struct fs_context *fc) 1355{ 1356 struct gfs2_args *args = fc->fs_private; 1357 1358 kfree(args); 1359} 1360 1361enum gfs2_param { 1362 Opt_lockproto, 1363 Opt_locktable, 1364 Opt_hostdata, 1365 Opt_spectator, 1366 Opt_ignore_local_fs, 1367 Opt_localflocks, 1368 Opt_localcaching, 1369 Opt_debug, 1370 Opt_upgrade, 1371 Opt_acl, 1372 Opt_quota, 1373 Opt_quota_flag, 1374 Opt_suiddir, 1375 Opt_data, 1376 Opt_meta, 1377 Opt_discard, 1378 Opt_commit, 1379 Opt_errors, 1380 Opt_statfs_quantum, 1381 Opt_statfs_percent, 1382 Opt_quota_quantum, 1383 Opt_barrier, 1384 Opt_rgrplvb, 1385 Opt_loccookie, 1386}; 1387 1388static const struct constant_table gfs2_param_quota[] = { 1389 {"off", GFS2_QUOTA_OFF}, 1390 {"account", GFS2_QUOTA_ACCOUNT}, 1391 {"on", GFS2_QUOTA_ON}, 1392 {"quiet", GFS2_QUOTA_QUIET}, 1393 {} 1394}; 1395 1396enum opt_data { 1397 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1398 Opt_data_ordered = GFS2_DATA_ORDERED, 1399}; 1400 1401static const struct constant_table gfs2_param_data[] = { 1402 {"writeback", Opt_data_writeback }, 1403 {"ordered", Opt_data_ordered }, 1404 {} 1405}; 1406 1407enum opt_errors { 1408 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1409 Opt_errors_panic = GFS2_ERRORS_PANIC, 1410}; 1411 1412static const struct constant_table gfs2_param_errors[] = { 1413 {"withdraw", Opt_errors_withdraw }, 1414 {"panic", Opt_errors_panic }, 1415 {} 1416}; 1417 1418static const struct fs_parameter_spec gfs2_fs_parameters[] = { 1419 fsparam_string ("lockproto", Opt_lockproto), 1420 fsparam_string ("locktable", Opt_locktable), 1421 fsparam_string ("hostdata", Opt_hostdata), 1422 fsparam_flag ("spectator", Opt_spectator), 1423 fsparam_flag ("norecovery", Opt_spectator), 1424 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1425 fsparam_flag ("localflocks", Opt_localflocks), 1426 fsparam_flag ("localcaching", Opt_localcaching), 1427 fsparam_flag_no("debug", Opt_debug), 1428 fsparam_flag ("upgrade", Opt_upgrade), 1429 fsparam_flag_no("acl", Opt_acl), 1430 fsparam_flag_no("suiddir", Opt_suiddir), 1431 fsparam_enum ("data", Opt_data, gfs2_param_data), 1432 fsparam_flag ("meta", Opt_meta), 1433 fsparam_flag_no("discard", Opt_discard), 1434 fsparam_s32 ("commit", Opt_commit), 1435 fsparam_enum ("errors", Opt_errors, gfs2_param_errors), 1436 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1437 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1438 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1439 fsparam_flag_no("barrier", Opt_barrier), 1440 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1441 fsparam_flag_no("loccookie", Opt_loccookie), 1442 /* quota can be a flag or an enum so it gets special treatment */ 1443 fsparam_flag_no("quota", Opt_quota_flag), 1444 fsparam_enum("quota", Opt_quota, gfs2_param_quota), 1445 {} 1446}; 1447 1448/* Parse a single mount parameter */ 1449static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1450{ 1451 struct gfs2_args *args = fc->fs_private; 1452 struct fs_parse_result result; 1453 int o; 1454 1455 o = fs_parse(fc, gfs2_fs_parameters, param, &result); 1456 if (o < 0) 1457 return o; 1458 1459 switch (o) { 1460 case Opt_lockproto: 1461 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1462 break; 1463 case Opt_locktable: 1464 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1465 break; 1466 case Opt_hostdata: 1467 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1468 break; 1469 case Opt_spectator: 1470 args->ar_spectator = 1; 1471 break; 1472 case Opt_ignore_local_fs: 1473 /* Retained for backwards compat only */ 1474 break; 1475 case Opt_localflocks: 1476 args->ar_localflocks = 1; 1477 break; 1478 case Opt_localcaching: 1479 /* Retained for backwards compat only */ 1480 break; 1481 case Opt_debug: 1482 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1483 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1484 args->ar_debug = result.boolean; 1485 break; 1486 case Opt_upgrade: 1487 /* Retained for backwards compat only */ 1488 break; 1489 case Opt_acl: 1490 args->ar_posix_acl = result.boolean; 1491 break; 1492 case Opt_quota_flag: 1493 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; 1494 break; 1495 case Opt_quota: 1496 args->ar_quota = result.int_32; 1497 break; 1498 case Opt_suiddir: 1499 args->ar_suiddir = result.boolean; 1500 break; 1501 case Opt_data: 1502 /* The uint_32 result maps directly to GFS2_DATA_* */ 1503 args->ar_data = result.uint_32; 1504 break; 1505 case Opt_meta: 1506 args->ar_meta = 1; 1507 break; 1508 case Opt_discard: 1509 args->ar_discard = result.boolean; 1510 break; 1511 case Opt_commit: 1512 if (result.int_32 <= 0) 1513 return invalfc(fc, "commit mount option requires a positive numeric argument"); 1514 args->ar_commit = result.int_32; 1515 break; 1516 case Opt_statfs_quantum: 1517 if (result.int_32 < 0) 1518 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); 1519 args->ar_statfs_quantum = result.int_32; 1520 break; 1521 case Opt_quota_quantum: 1522 if (result.int_32 <= 0) 1523 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); 1524 args->ar_quota_quantum = result.int_32; 1525 break; 1526 case Opt_statfs_percent: 1527 if (result.int_32 < 0 || result.int_32 > 100) 1528 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); 1529 args->ar_statfs_percent = result.int_32; 1530 break; 1531 case Opt_errors: 1532 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1533 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1534 args->ar_errors = result.uint_32; 1535 break; 1536 case Opt_barrier: 1537 args->ar_nobarrier = result.boolean; 1538 break; 1539 case Opt_rgrplvb: 1540 args->ar_rgrplvb = result.boolean; 1541 args->ar_got_rgrplvb = 1; 1542 break; 1543 case Opt_loccookie: 1544 args->ar_loccookie = result.boolean; 1545 break; 1546 default: 1547 return invalfc(fc, "invalid mount option: %s", param->key); 1548 } 1549 return 0; 1550} 1551 1552static int gfs2_reconfigure(struct fs_context *fc) 1553{ 1554 struct super_block *sb = fc->root->d_sb; 1555 struct gfs2_sbd *sdp = sb->s_fs_info; 1556 struct gfs2_args *oldargs = &sdp->sd_args; 1557 struct gfs2_args *newargs = fc->fs_private; 1558 struct gfs2_tune *gt = &sdp->sd_tune; 1559 int error = 0; 1560 1561 sync_filesystem(sb); 1562 1563 spin_lock(>->gt_spin); 1564 oldargs->ar_commit = gt->gt_logd_secs; 1565 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1566 if (gt->gt_statfs_slow) 1567 oldargs->ar_statfs_quantum = 0; 1568 else 1569 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1570 spin_unlock(>->gt_spin); 1571 1572 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1573 errorfc(fc, "reconfiguration of locking protocol not allowed"); 1574 return -EINVAL; 1575 } 1576 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1577 errorfc(fc, "reconfiguration of lock table not allowed"); 1578 return -EINVAL; 1579 } 1580 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1581 errorfc(fc, "reconfiguration of host data not allowed"); 1582 return -EINVAL; 1583 } 1584 if (newargs->ar_spectator != oldargs->ar_spectator) { 1585 errorfc(fc, "reconfiguration of spectator mode not allowed"); 1586 return -EINVAL; 1587 } 1588 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1589 errorfc(fc, "reconfiguration of localflocks not allowed"); 1590 return -EINVAL; 1591 } 1592 if (newargs->ar_meta != oldargs->ar_meta) { 1593 errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); 1594 return -EINVAL; 1595 } 1596 if (oldargs->ar_spectator) 1597 fc->sb_flags |= SB_RDONLY; 1598 1599 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1600 if (fc->sb_flags & SB_RDONLY) { 1601 gfs2_make_fs_ro(sdp); 1602 } else { 1603 error = gfs2_make_fs_rw(sdp); 1604 if (error) 1605 errorfc(fc, "unable to remount read-write"); 1606 } 1607 } 1608 sdp->sd_args = *newargs; 1609 1610 if (sdp->sd_args.ar_posix_acl) 1611 sb->s_flags |= SB_POSIXACL; 1612 else 1613 sb->s_flags &= ~SB_POSIXACL; 1614 if (sdp->sd_args.ar_nobarrier) 1615 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1616 else 1617 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1618 spin_lock(>->gt_spin); 1619 gt->gt_logd_secs = newargs->ar_commit; 1620 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1621 if (newargs->ar_statfs_quantum) { 1622 gt->gt_statfs_slow = 0; 1623 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1624 } 1625 else { 1626 gt->gt_statfs_slow = 1; 1627 gt->gt_statfs_quantum = 30; 1628 } 1629 spin_unlock(>->gt_spin); 1630 1631 gfs2_online_uevent(sdp); 1632 return error; 1633} 1634 1635static const struct fs_context_operations gfs2_context_ops = { 1636 .free = gfs2_fc_free, 1637 .parse_param = gfs2_parse_param, 1638 .get_tree = gfs2_get_tree, 1639 .reconfigure = gfs2_reconfigure, 1640}; 1641 1642/* Set up the filesystem mount context */ 1643static int gfs2_init_fs_context(struct fs_context *fc) 1644{ 1645 struct gfs2_args *args; 1646 1647 args = kmalloc(sizeof(*args), GFP_KERNEL); 1648 if (args == NULL) 1649 return -ENOMEM; 1650 1651 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1652 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1653 1654 *args = sdp->sd_args; 1655 } else { 1656 memset(args, 0, sizeof(*args)); 1657 args->ar_quota = GFS2_QUOTA_DEFAULT; 1658 args->ar_data = GFS2_DATA_DEFAULT; 1659 args->ar_commit = 30; 1660 args->ar_statfs_quantum = 30; 1661 args->ar_quota_quantum = 60; 1662 args->ar_errors = GFS2_ERRORS_DEFAULT; 1663 } 1664 fc->fs_private = args; 1665 fc->ops = &gfs2_context_ops; 1666 return 0; 1667} 1668 1669static int set_meta_super(struct super_block *s, struct fs_context *fc) 1670{ 1671 return -EINVAL; 1672} 1673 1674static int test_meta_super(struct super_block *s, struct fs_context *fc) 1675{ 1676 return (fc->sget_key == s->s_bdev); 1677} 1678 1679static int gfs2_meta_get_tree(struct fs_context *fc) 1680{ 1681 struct super_block *s; 1682 struct gfs2_sbd *sdp; 1683 struct path path; 1684 int error; 1685 1686 if (!fc->source || !*fc->source) 1687 return -EINVAL; 1688 1689 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1690 if (error) { 1691 pr_warn("path_lookup on %s returned error %d\n", 1692 fc->source, error); 1693 return error; 1694 } 1695 fc->fs_type = &gfs2_fs_type; 1696 fc->sget_key = path.dentry->d_sb->s_bdev; 1697 s = sget_fc(fc, test_meta_super, set_meta_super); 1698 path_put(&path); 1699 if (IS_ERR(s)) { 1700 pr_warn("gfs2 mount does not exist\n"); 1701 return PTR_ERR(s); 1702 } 1703 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1704 deactivate_locked_super(s); 1705 return -EBUSY; 1706 } 1707 sdp = s->s_fs_info; 1708 fc->root = dget(sdp->sd_master_dir); 1709 return 0; 1710} 1711 1712static const struct fs_context_operations gfs2_meta_context_ops = { 1713 .free = gfs2_fc_free, 1714 .get_tree = gfs2_meta_get_tree, 1715}; 1716 1717static int gfs2_meta_init_fs_context(struct fs_context *fc) 1718{ 1719 int ret = gfs2_init_fs_context(fc); 1720 1721 if (ret) 1722 return ret; 1723 1724 fc->ops = &gfs2_meta_context_ops; 1725 return 0; 1726} 1727 1728/** 1729 * gfs2_evict_inodes - evict inodes cooperatively 1730 * @sb: the superblock 1731 * 1732 * When evicting an inode with a zero link count, we are trying to upgrade the 1733 * inode's iopen glock from SH to EX mode in order to determine if we can 1734 * delete the inode. The other nodes are supposed to evict the inode from 1735 * their caches if they can, and to poke the inode's inode glock if they cannot 1736 * do so. Either behavior allows gfs2_upgrade_iopen_glock() to proceed 1737 * quickly, but if the other nodes are not cooperating, the lock upgrading 1738 * attempt will time out. Since inodes are evicted sequentially, this can add 1739 * up quickly. 1740 * 1741 * Function evict_inodes() tries to keep the s_inode_list_lock list locked over 1742 * a long time, which prevents other inodes from being evicted concurrently. 1743 * This precludes the cooperative behavior we are looking for. This special 1744 * version of evict_inodes() avoids that. 1745 * 1746 * Modeled after drop_pagecache_sb(). 1747 */ 1748static void gfs2_evict_inodes(struct super_block *sb) 1749{ 1750 struct inode *inode, *toput_inode = NULL; 1751 struct gfs2_sbd *sdp = sb->s_fs_info; 1752 1753 set_bit(SDF_EVICTING, &sdp->sd_flags); 1754 1755 spin_lock(&sb->s_inode_list_lock); 1756 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 1757 spin_lock(&inode->i_lock); 1758 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) && 1759 !need_resched()) { 1760 spin_unlock(&inode->i_lock); 1761 continue; 1762 } 1763 atomic_inc(&inode->i_count); 1764 spin_unlock(&inode->i_lock); 1765 spin_unlock(&sb->s_inode_list_lock); 1766 1767 iput(toput_inode); 1768 toput_inode = inode; 1769 1770 cond_resched(); 1771 spin_lock(&sb->s_inode_list_lock); 1772 } 1773 spin_unlock(&sb->s_inode_list_lock); 1774 iput(toput_inode); 1775} 1776 1777static void gfs2_kill_sb(struct super_block *sb) 1778{ 1779 struct gfs2_sbd *sdp = sb->s_fs_info; 1780 1781 if (sdp == NULL) { 1782 kill_block_super(sb); 1783 return; 1784 } 1785 1786 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1787 dput(sdp->sd_root_dir); 1788 dput(sdp->sd_master_dir); 1789 sdp->sd_root_dir = NULL; 1790 sdp->sd_master_dir = NULL; 1791 shrink_dcache_sb(sb); 1792 1793 gfs2_evict_inodes(sb); 1794 1795 /* 1796 * Flush and then drain the delete workqueue here (via 1797 * destroy_workqueue()) to ensure that any delete work that 1798 * may be running will also see the SDF_KILL flag. 1799 */ 1800 set_bit(SDF_KILL, &sdp->sd_flags); 1801 gfs2_flush_delete_work(sdp); 1802 destroy_workqueue(sdp->sd_delete_wq); 1803 1804 kill_block_super(sb); 1805} 1806 1807struct file_system_type gfs2_fs_type = { 1808 .name = "gfs2", 1809 .fs_flags = FS_REQUIRES_DEV, 1810 .init_fs_context = gfs2_init_fs_context, 1811 .parameters = gfs2_fs_parameters, 1812 .kill_sb = gfs2_kill_sb, 1813 .owner = THIS_MODULE, 1814}; 1815MODULE_ALIAS_FS("gfs2"); 1816 1817struct file_system_type gfs2meta_fs_type = { 1818 .name = "gfs2meta", 1819 .fs_flags = FS_REQUIRES_DEV, 1820 .init_fs_context = gfs2_meta_init_fs_context, 1821 .owner = THIS_MODULE, 1822}; 1823MODULE_ALIAS_FS("gfs2meta"); 1824