1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
40 #include "trace_gfs2.h"
47 * gfs2_tune_init - Fill a gfs2_tune structure with default values
52 static void gfs2_tune_init(struct gfs2_tune *gt)
54 spin_lock_init(>->gt_spin);
56 gt->gt_quota_warn_period = 10;
57 gt->gt_quota_scale_num = 1;
58 gt->gt_quota_scale_den = 1;
59 gt->gt_new_files_jdata = 0;
60 gt->gt_max_readahead = BIT(18);
61 gt->gt_complain_secs = 10;
64 void free_sbd(struct gfs2_sbd *sdp)
67 free_percpu(sdp->sd_lkstats);
71 static struct gfs2_sbd *init_sbd(struct super_block *sb)
74 struct address_space *mapping;
76 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
81 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
86 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
87 gfs2_tune_init(&sdp->sd_tune);
89 init_waitqueue_head(&sdp->sd_glock_wait);
90 atomic_set(&sdp->sd_glock_disposal, 0);
91 init_completion(&sdp->sd_locking_init);
92 init_completion(&sdp->sd_wdack);
93 spin_lock_init(&sdp->sd_statfs_spin);
95 spin_lock_init(&sdp->sd_rindex_spin);
96 sdp->sd_rindex_tree.rb_node = NULL;
98 INIT_LIST_HEAD(&sdp->sd_jindex_list);
99 spin_lock_init(&sdp->sd_jindex_spin);
100 mutex_init(&sdp->sd_jindex_mutex);
101 init_completion(&sdp->sd_journal_ready);
103 INIT_LIST_HEAD(&sdp->sd_quota_list);
104 mutex_init(&sdp->sd_quota_mutex);
105 mutex_init(&sdp->sd_quota_sync_mutex);
106 init_waitqueue_head(&sdp->sd_quota_wait);
107 INIT_LIST_HEAD(&sdp->sd_trunc_list);
108 spin_lock_init(&sdp->sd_trunc_lock);
109 spin_lock_init(&sdp->sd_bitmap_lock);
111 mapping = &sdp->sd_aspace;
113 address_space_init_once(mapping);
114 mapping->a_ops = &gfs2_rgrp_aops;
115 mapping->host = sb->s_bdev->bd_inode;
117 mapping_set_gfp_mask(mapping, GFP_NOFS);
118 mapping->private_data = NULL;
119 mapping->writeback_index = 0;
121 spin_lock_init(&sdp->sd_log_lock);
122 atomic_set(&sdp->sd_log_pinned, 0);
123 INIT_LIST_HEAD(&sdp->sd_log_revokes);
124 INIT_LIST_HEAD(&sdp->sd_log_ordered);
125 spin_lock_init(&sdp->sd_ordered_lock);
127 init_waitqueue_head(&sdp->sd_log_waitq);
128 init_waitqueue_head(&sdp->sd_logd_waitq);
129 spin_lock_init(&sdp->sd_ail_lock);
130 INIT_LIST_HEAD(&sdp->sd_ail1_list);
131 INIT_LIST_HEAD(&sdp->sd_ail2_list);
133 init_rwsem(&sdp->sd_log_flush_lock);
134 atomic_set(&sdp->sd_log_in_flight, 0);
135 atomic_set(&sdp->sd_reserving_log, 0);
136 init_waitqueue_head(&sdp->sd_reserving_log_wait);
137 init_waitqueue_head(&sdp->sd_log_flush_wait);
138 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
139 mutex_init(&sdp->sd_freeze_mutex);
149 * gfs2_check_sb - Check superblock
150 * @sdp: the filesystem
151 * @sb: The superblock
152 * @silent: Don't print a message if the check fails
154 * Checks the version code of the FS is one that we understand how to
155 * read and that the sizes of the various on-disk structures have not
159 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
161 struct gfs2_sb_host *sb = &sdp->sd_sb;
163 if (sb->sb_magic != GFS2_MAGIC ||
164 sb->sb_type != GFS2_METATYPE_SB) {
166 pr_warn("not a GFS2 filesystem\n");
170 /* If format numbers match exactly, we're done. */
172 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
173 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
176 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
181 static void end_bio_io_page(struct bio *bio)
183 struct page *page = bio->bi_private;
186 SetPageUptodate(page);
188 pr_warn("error %d reading superblock\n", bio->bi_status);
192 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
194 struct gfs2_sb_host *sb = &sdp->sd_sb;
195 struct super_block *s = sdp->sd_vfs;
196 const struct gfs2_sb *str = buf;
198 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
199 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
200 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
201 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
202 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
203 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
204 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
205 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
206 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
207 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
208 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
210 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
211 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
212 memcpy(&s->s_uuid, str->sb_uuid, 16);
216 * gfs2_read_super - Read the gfs2 super block from disk
217 * @sdp: The GFS2 super block
218 * @sector: The location of the super block
219 * @error: The error code to return
221 * This uses the bio functions to read the super block from disk
222 * because we want to be 100% sure that we never read cached data.
223 * A super block is read twice only during each GFS2 mount and is
224 * never written to by the filesystem. The first time its read no
225 * locks are held, and the only details which are looked at are those
226 * relating to the locking protocol. Once locking is up and working,
227 * the sb is read again under the lock to establish the location of
228 * the master directory (contains pointers to journals etc) and the
231 * Returns: 0 on success or error
234 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
236 struct super_block *sb = sdp->sd_vfs;
241 page = alloc_page(GFP_NOFS);
245 ClearPageUptodate(page);
246 ClearPageDirty(page);
249 bio = bio_alloc(GFP_NOFS, 1);
250 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
251 bio_set_dev(bio, sb->s_bdev);
252 bio_add_page(bio, page, PAGE_SIZE, 0);
254 bio->bi_end_io = end_bio_io_page;
255 bio->bi_private = page;
256 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
258 wait_on_page_locked(page);
260 if (!PageUptodate(page)) {
268 return gfs2_check_sb(sdp, silent);
272 * gfs2_read_sb - Read super block
273 * @sdp: The GFS2 superblock
274 * @silent: Don't print message if mount fails
278 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
280 u32 hash_blocks, ind_blocks, leaf_blocks;
285 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
288 fs_err(sdp, "can't read superblock\n");
292 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
293 GFS2_BASIC_BLOCK_SHIFT;
294 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
295 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
296 sizeof(struct gfs2_dinode)) / sizeof(u64);
297 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
298 sizeof(struct gfs2_meta_header)) / sizeof(u64);
299 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
300 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
301 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
302 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
303 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
304 sizeof(struct gfs2_meta_header)) /
305 sizeof(struct gfs2_quota_change);
306 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
307 sizeof(struct gfs2_meta_header))
308 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
310 /* Compute maximum reservation required to add a entry to a directory */
312 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
316 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
317 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
318 ind_blocks += tmp_blocks;
321 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
323 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
325 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
326 sizeof(struct gfs2_dinode);
327 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
332 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
334 m = do_div(d, sdp->sd_inptrs);
336 if (d != sdp->sd_heightsize[x - 1] || m)
338 sdp->sd_heightsize[x] = space;
340 sdp->sd_max_height = x;
341 sdp->sd_heightsize[x] = ~0;
342 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
344 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
345 sizeof(struct gfs2_leaf)) /
346 GFS2_MIN_DIRENT_SIZE;
350 static int init_names(struct gfs2_sbd *sdp, int silent)
355 proto = sdp->sd_args.ar_lockproto;
356 table = sdp->sd_args.ar_locktable;
358 /* Try to autodetect */
360 if (!proto[0] || !table[0]) {
361 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
366 proto = sdp->sd_sb.sb_lockproto;
368 table = sdp->sd_sb.sb_locktable;
372 table = sdp->sd_vfs->s_id;
374 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
375 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
377 table = sdp->sd_table_name;
378 while ((table = strchr(table, '/')))
384 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
392 error = gfs2_glock_nq_num(sdp,
393 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
394 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
397 fs_err(sdp, "can't acquire mount glock: %d\n", error);
401 error = gfs2_glock_nq_num(sdp,
402 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
404 LM_FLAG_NOEXP | GL_EXACT,
407 fs_err(sdp, "can't acquire live glock: %d\n", error);
411 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
412 CREATE, &sdp->sd_rename_gl);
414 fs_err(sdp, "can't create rename glock: %d\n", error);
418 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
419 CREATE, &sdp->sd_freeze_gl);
421 fs_err(sdp, "can't create transaction glock: %d\n", error);
428 gfs2_glock_put(sdp->sd_freeze_gl);
430 gfs2_glock_put(sdp->sd_rename_gl);
432 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
434 gfs2_glock_dq_uninit(mount_gh);
439 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
440 u64 no_addr, const char *name)
442 struct gfs2_sbd *sdp = sb->s_fs_info;
443 struct dentry *dentry;
446 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
447 GFS2_BLKST_FREE /* ignore */);
449 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
450 return PTR_ERR(inode);
452 dentry = d_make_root(inode);
454 fs_err(sdp, "can't alloc %s dentry\n", name);
461 static int init_sb(struct gfs2_sbd *sdp, int silent)
463 struct super_block *sb = sdp->sd_vfs;
464 struct gfs2_holder sb_gh;
468 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
469 LM_ST_SHARED, 0, &sb_gh);
471 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
475 ret = gfs2_read_sb(sdp, silent);
477 fs_err(sdp, "can't read superblock: %d\n", ret);
481 /* Set up the buffer cache and SB for real */
482 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
484 fs_err(sdp, "FS block size (%u) is too small for device "
486 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
489 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
491 fs_err(sdp, "FS block size (%u) is too big for machine "
493 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
496 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
498 /* Get the root inode */
499 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
500 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
504 /* Get the master inode */
505 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
506 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
508 dput(sdp->sd_root_dir);
511 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
513 gfs2_glock_dq_uninit(&sb_gh);
517 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
519 char *message = "FIRSTMOUNT=Done";
520 char *envp[] = { message, NULL };
522 fs_info(sdp, "first mount done, others may mount\n");
524 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
525 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
527 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
531 * gfs2_jindex_hold - Grab a lock on the jindex
532 * @sdp: The GFS2 superblock
533 * @ji_gh: the holder for the jindex glock
538 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
540 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
543 struct gfs2_jdesc *jd;
548 mutex_lock(&sdp->sd_jindex_mutex);
551 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
555 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
556 name.hash = gfs2_disk_hash(name.name, name.len);
558 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
559 if (error == -ENOENT) {
564 gfs2_glock_dq_uninit(ji_gh);
570 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
574 INIT_LIST_HEAD(&jd->extent_list);
575 INIT_LIST_HEAD(&jd->jd_revoke_list);
577 INIT_WORK(&jd->jd_work, gfs2_recover_func);
578 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
579 if (IS_ERR_OR_NULL(jd->jd_inode)) {
583 error = PTR_ERR(jd->jd_inode);
588 spin_lock(&sdp->sd_jindex_spin);
589 jd->jd_jid = sdp->sd_journals++;
590 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
591 spin_unlock(&sdp->sd_jindex_spin);
594 mutex_unlock(&sdp->sd_jindex_mutex);
600 * check_journal_clean - Make sure a journal is clean for a spectator mount
601 * @sdp: The GFS2 superblock
602 * @jd: The journal descriptor
604 * Returns: 0 if the journal is clean or locked, else an error
606 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
609 struct gfs2_holder j_gh;
610 struct gfs2_log_header_host head;
611 struct gfs2_inode *ip;
613 ip = GFS2_I(jd->jd_inode);
614 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
615 GL_EXACT | GL_NOCACHE, &j_gh);
617 fs_err(sdp, "Error locking journal for spectator mount.\n");
620 error = gfs2_jdesc_check(jd);
622 fs_err(sdp, "Error checking journal for spectator mount.\n");
625 error = gfs2_find_jhead(jd, &head, false);
627 fs_err(sdp, "Error parsing journal for spectator mount.\n");
630 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
632 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
633 "must not be a spectator.\n", jd->jd_jid);
637 gfs2_glock_dq_uninit(&j_gh);
641 static int init_journal(struct gfs2_sbd *sdp, int undo)
643 struct inode *master = d_inode(sdp->sd_master_dir);
644 struct gfs2_holder ji_gh;
645 struct gfs2_inode *ip;
654 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
655 if (IS_ERR(sdp->sd_jindex)) {
656 fs_err(sdp, "can't lookup journal index: %d\n", error);
657 return PTR_ERR(sdp->sd_jindex);
660 /* Load in the journal index special file */
662 error = gfs2_jindex_hold(sdp, &ji_gh);
664 fs_err(sdp, "can't read journal index: %d\n", error);
669 if (!gfs2_jindex_size(sdp)) {
670 fs_err(sdp, "no journals!\n");
674 atomic_set(&sdp->sd_log_blks_needed, 0);
675 if (sdp->sd_args.ar_spectator) {
676 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
677 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
678 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
679 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
681 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
682 fs_err(sdp, "can't mount journal #%u\n",
683 sdp->sd_lockstruct.ls_jid);
684 fs_err(sdp, "there are only %u journals (0 - %u)\n",
685 gfs2_jindex_size(sdp),
686 gfs2_jindex_size(sdp) - 1);
689 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
691 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
693 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
694 &sdp->sd_journal_gh);
696 fs_err(sdp, "can't acquire journal glock: %d\n", error);
700 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
701 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
702 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
705 fs_err(sdp, "can't acquire journal inode glock: %d\n",
707 goto fail_journal_gh;
710 error = gfs2_jdesc_check(sdp->sd_jdesc);
712 fs_err(sdp, "my journal (%u) is bad: %d\n",
713 sdp->sd_jdesc->jd_jid, error);
716 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
717 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
718 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
720 /* Map the extents for this journal's blocks */
721 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
723 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
725 if (sdp->sd_lockstruct.ls_first) {
727 for (x = 0; x < sdp->sd_journals; x++) {
728 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
730 if (sdp->sd_args.ar_spectator) {
731 error = check_journal_clean(sdp, jd);
736 error = gfs2_recover_journal(jd, true);
738 fs_err(sdp, "error recovering journal %u: %d\n",
744 gfs2_others_may_mount(sdp);
745 } else if (!sdp->sd_args.ar_spectator) {
746 error = gfs2_recover_journal(sdp->sd_jdesc, true);
748 fs_err(sdp, "error recovering my journal: %d\n", error);
753 sdp->sd_log_idle = 1;
754 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
755 gfs2_glock_dq_uninit(&ji_gh);
757 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
761 if (!sdp->sd_args.ar_spectator)
762 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
764 if (!sdp->sd_args.ar_spectator)
765 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
767 gfs2_jindex_free(sdp);
769 gfs2_glock_dq_uninit(&ji_gh);
771 iput(sdp->sd_jindex);
775 static struct lock_class_key gfs2_quota_imutex_key;
777 static int init_inodes(struct gfs2_sbd *sdp, int undo)
780 struct inode *master = d_inode(sdp->sd_master_dir);
785 error = init_journal(sdp, undo);
786 complete_all(&sdp->sd_journal_ready);
790 /* Read in the master statfs inode */
791 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
792 if (IS_ERR(sdp->sd_statfs_inode)) {
793 error = PTR_ERR(sdp->sd_statfs_inode);
794 fs_err(sdp, "can't read in statfs inode: %d\n", error);
798 /* Read in the resource index inode */
799 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
800 if (IS_ERR(sdp->sd_rindex)) {
801 error = PTR_ERR(sdp->sd_rindex);
802 fs_err(sdp, "can't get resource index inode: %d\n", error);
805 sdp->sd_rindex_uptodate = 0;
807 /* Read in the quota inode */
808 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
809 if (IS_ERR(sdp->sd_quota_inode)) {
810 error = PTR_ERR(sdp->sd_quota_inode);
811 fs_err(sdp, "can't get quota file inode: %d\n", error);
815 * i_rwsem on quota files is special. Since this inode is hidden system
816 * file, we are safe to define locking ourselves.
818 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
819 &gfs2_quota_imutex_key);
821 error = gfs2_rindex_update(sdp);
828 iput(sdp->sd_quota_inode);
830 gfs2_clear_rgrpd(sdp);
831 iput(sdp->sd_rindex);
833 iput(sdp->sd_statfs_inode);
835 init_journal(sdp, UNDO);
840 static int init_per_node(struct gfs2_sbd *sdp, int undo)
842 struct inode *pn = NULL;
845 struct gfs2_inode *ip;
846 struct inode *master = d_inode(sdp->sd_master_dir);
848 if (sdp->sd_args.ar_spectator)
854 pn = gfs2_lookup_simple(master, "per_node");
857 fs_err(sdp, "can't find per_node directory: %d\n", error);
861 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
862 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
863 if (IS_ERR(sdp->sd_sc_inode)) {
864 error = PTR_ERR(sdp->sd_sc_inode);
865 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
869 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
870 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
871 if (IS_ERR(sdp->sd_qc_inode)) {
872 error = PTR_ERR(sdp->sd_qc_inode);
873 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
880 ip = GFS2_I(sdp->sd_sc_inode);
881 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
884 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
888 ip = GFS2_I(sdp->sd_qc_inode);
889 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
892 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
899 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
901 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
903 iput(sdp->sd_qc_inode);
905 iput(sdp->sd_sc_inode);
911 static const match_table_t nolock_tokens = {
912 { Opt_jid, "jid=%d\n", },
916 static const struct lm_lockops nolock_ops = {
917 .lm_proto_name = "lock_nolock",
918 .lm_put_lock = gfs2_glock_free,
919 .lm_tokens = &nolock_tokens,
923 * gfs2_lm_mount - mount a locking protocol
924 * @sdp: the filesystem
925 * @args: mount arguments
926 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
931 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
933 const struct lm_lockops *lm;
934 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
935 struct gfs2_args *args = &sdp->sd_args;
936 const char *proto = sdp->sd_proto_name;
937 const char *table = sdp->sd_table_name;
941 if (!strcmp("lock_nolock", proto)) {
943 sdp->sd_args.ar_localflocks = 1;
944 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
945 } else if (!strcmp("lock_dlm", proto)) {
949 pr_info("can't find protocol %s\n", proto);
953 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
958 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
959 substring_t tmp[MAX_OPT_ARGS];
965 token = match_token(o, *lm->lm_tokens, tmp);
968 ret = match_int(&tmp[0], &option);
969 if (ret || option < 0)
971 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
976 /* Obsolete, but left for backward compat purposes */
979 ret = match_int(&tmp[0], &option);
980 if (ret || (option != 0 && option != 1))
982 ls->ls_first = option;
987 fs_info(sdp, "unknown hostdata (%s)\n", o);
992 if (lm->lm_mount == NULL) {
993 fs_info(sdp, "Now mounting FS...\n");
994 complete_all(&sdp->sd_locking_init);
997 ret = lm->lm_mount(sdp, table);
999 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1000 complete_all(&sdp->sd_locking_init);
1004 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1006 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1007 if (likely(!test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) &&
1009 lm->lm_unmount(sdp);
1012 static int wait_on_journal(struct gfs2_sbd *sdp)
1014 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1017 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1021 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1023 struct super_block *sb = sdp->sd_vfs;
1026 char *envp[] = { ro, spectator, NULL };
1027 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1028 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1029 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1033 * fill_super - Read in superblock
1034 * @sb: The VFS superblock
1035 * @data: Mount options
1036 * @silent: Don't complain if it's not a GFS2 filesystem
1041 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1043 struct gfs2_sbd *sdp;
1044 struct gfs2_holder mount_gh;
1049 pr_warn("can't alloc struct gfs2_sbd\n");
1052 sdp->sd_args = *args;
1054 if (sdp->sd_args.ar_spectator) {
1055 sb->s_flags |= SB_RDONLY;
1056 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1058 if (sdp->sd_args.ar_posix_acl)
1059 sb->s_flags |= SB_POSIXACL;
1060 if (sdp->sd_args.ar_nobarrier)
1061 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1063 sb->s_flags |= SB_NOSEC;
1064 sb->s_magic = GFS2_MAGIC;
1065 sb->s_op = &gfs2_super_ops;
1066 sb->s_d_op = &gfs2_dops;
1067 sb->s_export_op = &gfs2_export_ops;
1068 sb->s_xattr = gfs2_xattr_handlers;
1069 sb->s_qcop = &gfs2_quotactl_ops;
1070 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1071 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1072 sb->s_time_gran = 1;
1073 sb->s_maxbytes = MAX_LFS_FILESIZE;
1075 /* Set up the buffer cache and fill in some fake block size values
1076 to allow us to read-in the on-disk superblock. */
1077 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1078 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1079 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1080 GFS2_BASIC_BLOCK_SHIFT;
1081 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1083 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1084 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1085 if (sdp->sd_args.ar_statfs_quantum) {
1086 sdp->sd_tune.gt_statfs_slow = 0;
1087 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1089 sdp->sd_tune.gt_statfs_slow = 1;
1090 sdp->sd_tune.gt_statfs_quantum = 30;
1093 error = init_names(sdp, silent);
1095 /* In this case, we haven't initialized sysfs, so we have to
1096 manually free the sdp. */
1098 sb->s_fs_info = NULL;
1102 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1104 error = gfs2_sys_fs_add(sdp);
1106 * If we hit an error here, gfs2_sys_fs_add will have called function
1107 * kobject_put which causes the sysfs usage count to go to zero, which
1108 * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1109 * Subsequent error paths here will call gfs2_sys_fs_del, which also
1110 * kobject_put to free sdp.
1115 gfs2_create_debugfs_file(sdp);
1117 error = gfs2_lm_mount(sdp, silent);
1121 error = init_locking(sdp, &mount_gh, DO);
1125 error = init_sb(sdp, silent);
1129 error = wait_on_journal(sdp);
1134 * If user space has failed to join the cluster or some similar
1135 * failure has occurred, then the journal id will contain a
1136 * negative (error) number. This will then be returned to the
1137 * caller (of the mount syscall). We do this even for spectator
1138 * mounts (which just write a jid of 0 to indicate "ok" even though
1139 * the jid is unused in the spectator case)
1141 if (sdp->sd_lockstruct.ls_jid < 0) {
1142 error = sdp->sd_lockstruct.ls_jid;
1143 sdp->sd_lockstruct.ls_jid = 0;
1147 if (sdp->sd_args.ar_spectator)
1148 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1149 sdp->sd_table_name);
1151 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1152 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1154 error = init_inodes(sdp, DO);
1158 error = init_per_node(sdp, DO);
1162 error = gfs2_statfs_init(sdp);
1164 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1168 if (!sb_rdonly(sb)) {
1169 error = gfs2_make_fs_rw(sdp);
1171 fs_err(sdp, "can't make FS RW: %d\n", error);
1176 gfs2_glock_dq_uninit(&mount_gh);
1177 gfs2_online_uevent(sdp);
1181 init_per_node(sdp, UNDO);
1183 init_inodes(sdp, UNDO);
1185 if (sdp->sd_root_dir)
1186 dput(sdp->sd_root_dir);
1187 if (sdp->sd_master_dir)
1188 dput(sdp->sd_master_dir);
1193 init_locking(sdp, &mount_gh, UNDO);
1195 complete_all(&sdp->sd_journal_ready);
1196 gfs2_gl_hash_clear(sdp);
1197 gfs2_lm_unmount(sdp);
1199 gfs2_delete_debugfs_file(sdp);
1200 /* gfs2_sys_fs_del must be the last thing we do, since it causes
1201 * sysfs to call function gfs2_sbd_release, which frees sdp. */
1202 gfs2_sys_fs_del(sdp);
1203 sb->s_fs_info = NULL;
1207 static int set_gfs2_super(struct super_block *s, void *data)
1210 s->s_dev = s->s_bdev->bd_dev;
1211 s->s_bdi = bdi_get(s->s_bdev->bd_bdi);
1215 static int test_gfs2_super(struct super_block *s, void *ptr)
1217 struct block_device *bdev = ptr;
1218 return (bdev == s->s_bdev);
1222 * gfs2_mount - Get the GFS2 superblock
1223 * @fs_type: The GFS2 filesystem type
1224 * @flags: Mount flags
1225 * @dev_name: The name of the device
1226 * @data: The mount arguments
1228 * Q. Why not use get_sb_bdev() ?
1229 * A. We need to select one of two root directories to mount, independent
1230 * of whether this is the initial, or subsequent, mount of this sb
1232 * Returns: 0 or -ve on error
1235 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
1236 const char *dev_name, void *data)
1238 struct block_device *bdev;
1239 struct super_block *s;
1240 fmode_t mode = FMODE_READ | FMODE_EXCL;
1242 struct gfs2_args args;
1243 struct gfs2_sbd *sdp;
1245 if (!(flags & SB_RDONLY))
1246 mode |= FMODE_WRITE;
1248 bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1250 return ERR_CAST(bdev);
1253 * once the super is inserted into the list by sget, s_umount
1254 * will protect the lockfs code from trying to start a snapshot
1255 * while we are mounting
1257 mutex_lock(&bdev->bd_fsfreeze_mutex);
1258 if (bdev->bd_fsfreeze_count > 0) {
1259 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1263 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev);
1264 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1271 * s_umount nests inside bd_mutex during
1272 * __invalidate_device(). blkdev_put() acquires
1273 * bd_mutex and can't be called under s_umount. Drop
1274 * s_umount temporarily. This is safe as we're
1275 * holding an active reference.
1277 up_write(&s->s_umount);
1278 blkdev_put(bdev, mode);
1279 down_write(&s->s_umount);
1281 /* s_mode must be set before deactivate_locked_super calls */
1285 memset(&args, 0, sizeof(args));
1286 args.ar_quota = GFS2_QUOTA_DEFAULT;
1287 args.ar_data = GFS2_DATA_DEFAULT;
1288 args.ar_commit = 30;
1289 args.ar_statfs_quantum = 30;
1290 args.ar_quota_quantum = 60;
1291 args.ar_errors = GFS2_ERRORS_DEFAULT;
1293 error = gfs2_mount_args(&args, data);
1295 pr_warn("can't parse mount arguments\n");
1301 if ((flags ^ s->s_flags) & SB_RDONLY)
1304 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
1305 sb_set_blocksize(s, block_size(bdev));
1306 error = fill_super(s, &args, flags & SB_SILENT ? 1 : 0);
1309 s->s_flags |= SB_ACTIVE;
1315 return dget(sdp->sd_master_dir);
1317 return dget(sdp->sd_root_dir);
1320 deactivate_locked_super(s);
1321 return ERR_PTR(error);
1323 blkdev_put(bdev, mode);
1324 return ERR_PTR(error);
1327 static int set_meta_super(struct super_block *s, void *ptr)
1332 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
1333 int flags, const char *dev_name, void *data)
1335 struct super_block *s;
1336 struct gfs2_sbd *sdp;
1340 if (!dev_name || !*dev_name)
1341 return ERR_PTR(-EINVAL);
1343 error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1345 pr_warn("path_lookup on %s returned error %d\n",
1347 return ERR_PTR(error);
1349 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
1350 path.dentry->d_sb->s_bdev);
1353 pr_warn("gfs2 mount does not exist\n");
1356 if ((flags ^ s->s_flags) & SB_RDONLY) {
1357 deactivate_locked_super(s);
1358 return ERR_PTR(-EBUSY);
1361 return dget(sdp->sd_master_dir);
1364 static void gfs2_kill_sb(struct super_block *sb)
1366 struct gfs2_sbd *sdp = sb->s_fs_info;
1369 kill_block_super(sb);
1373 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1374 dput(sdp->sd_root_dir);
1375 dput(sdp->sd_master_dir);
1376 sdp->sd_root_dir = NULL;
1377 sdp->sd_master_dir = NULL;
1378 shrink_dcache_sb(sb);
1379 kill_block_super(sb);
1382 struct file_system_type gfs2_fs_type = {
1384 .fs_flags = FS_REQUIRES_DEV,
1385 .mount = gfs2_mount,
1386 .kill_sb = gfs2_kill_sb,
1387 .owner = THIS_MODULE,
1389 MODULE_ALIAS_FS("gfs2");
1391 struct file_system_type gfs2meta_fs_type = {
1393 .fs_flags = FS_REQUIRES_DEV,
1394 .mount = gfs2_mount_meta,
1395 .owner = THIS_MODULE,
1397 MODULE_ALIAS_FS("gfs2meta");