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>
24 #include <linux/fs_parser.h>
41 #include "trace_gfs2.h"
48 * gfs2_tune_init - Fill a gfs2_tune structure with default values
53 static void gfs2_tune_init(struct gfs2_tune *gt)
55 spin_lock_init(>->gt_spin);
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;
65 void free_sbd(struct gfs2_sbd *sdp)
68 free_percpu(sdp->sd_lkstats);
72 static struct gfs2_sbd *init_sbd(struct super_block *sb)
75 struct address_space *mapping;
77 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
82 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
87 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
88 gfs2_tune_init(&sdp->sd_tune);
90 init_waitqueue_head(&sdp->sd_glock_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);
97 spin_lock_init(&sdp->sd_rindex_spin);
98 sdp->sd_rindex_tree.rb_node = NULL;
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);
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 INIT_LIST_HEAD(&sdp->sd_trunc_list);
110 spin_lock_init(&sdp->sd_trunc_lock);
111 spin_lock_init(&sdp->sd_bitmap_lock);
113 mapping = &sdp->sd_aspace;
115 address_space_init_once(mapping);
116 mapping->a_ops = &gfs2_rgrp_aops;
117 mapping->host = sb->s_bdev->bd_inode;
119 mapping_set_gfp_mask(mapping, GFP_NOFS);
120 mapping->private_data = NULL;
121 mapping->writeback_index = 0;
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);
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);
135 init_rwsem(&sdp->sd_log_flush_lock);
136 atomic_set(&sdp->sd_log_in_flight, 0);
137 atomic_set(&sdp->sd_reserving_log, 0);
138 init_waitqueue_head(&sdp->sd_reserving_log_wait);
139 init_waitqueue_head(&sdp->sd_log_flush_wait);
140 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
141 mutex_init(&sdp->sd_freeze_mutex);
151 * gfs2_check_sb - Check superblock
152 * @sdp: the filesystem
153 * @sb: The superblock
154 * @silent: Don't print a message if the check fails
156 * Checks the version code of the FS is one that we understand how to
157 * read and that the sizes of the various on-disk structures have not
161 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
163 struct gfs2_sb_host *sb = &sdp->sd_sb;
165 if (sb->sb_magic != GFS2_MAGIC ||
166 sb->sb_type != GFS2_METATYPE_SB) {
168 pr_warn("not a GFS2 filesystem\n");
172 /* If format numbers match exactly, we're done. */
174 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
175 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
178 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
183 static void end_bio_io_page(struct bio *bio)
185 struct page *page = bio->bi_private;
188 SetPageUptodate(page);
190 pr_warn("error %d reading superblock\n", bio->bi_status);
194 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
196 struct gfs2_sb_host *sb = &sdp->sd_sb;
197 struct super_block *s = sdp->sd_vfs;
198 const struct gfs2_sb *str = buf;
200 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
201 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
202 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
203 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
204 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
205 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
206 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
207 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
208 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
209 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
210 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
212 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
213 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
214 memcpy(&s->s_uuid, str->sb_uuid, 16);
218 * gfs2_read_super - Read the gfs2 super block from disk
219 * @sdp: The GFS2 super block
220 * @sector: The location of the super block
221 * @error: The error code to return
223 * This uses the bio functions to read the super block from disk
224 * because we want to be 100% sure that we never read cached data.
225 * A super block is read twice only during each GFS2 mount and is
226 * never written to by the filesystem. The first time its read no
227 * locks are held, and the only details which are looked at are those
228 * relating to the locking protocol. Once locking is up and working,
229 * the sb is read again under the lock to establish the location of
230 * the master directory (contains pointers to journals etc) and the
233 * Returns: 0 on success or error
236 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
238 struct super_block *sb = sdp->sd_vfs;
243 page = alloc_page(GFP_NOFS);
247 ClearPageUptodate(page);
248 ClearPageDirty(page);
251 bio = bio_alloc(GFP_NOFS, 1);
252 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
253 bio_set_dev(bio, sb->s_bdev);
254 bio_add_page(bio, page, PAGE_SIZE, 0);
256 bio->bi_end_io = end_bio_io_page;
257 bio->bi_private = page;
258 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
260 wait_on_page_locked(page);
262 if (!PageUptodate(page)) {
270 return gfs2_check_sb(sdp, silent);
274 * gfs2_read_sb - Read super block
275 * @sdp: The GFS2 superblock
276 * @silent: Don't print message if mount fails
280 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
282 u32 hash_blocks, ind_blocks, leaf_blocks;
287 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
290 fs_err(sdp, "can't read superblock\n");
294 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
295 GFS2_BASIC_BLOCK_SHIFT;
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 */
314 /* Compute maximum reservation required to add a entry to a directory */
316 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
320 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
321 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
322 ind_blocks += tmp_blocks;
325 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
327 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
329 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
330 sizeof(struct gfs2_dinode);
331 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
336 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
338 m = do_div(d, sdp->sd_inptrs);
340 if (d != sdp->sd_heightsize[x - 1] || m)
342 sdp->sd_heightsize[x] = space;
344 sdp->sd_max_height = x;
345 sdp->sd_heightsize[x] = ~0;
346 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
348 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
349 sizeof(struct gfs2_leaf)) /
350 GFS2_MIN_DIRENT_SIZE;
354 static int init_names(struct gfs2_sbd *sdp, int silent)
359 proto = sdp->sd_args.ar_lockproto;
360 table = sdp->sd_args.ar_locktable;
362 /* Try to autodetect */
364 if (!proto[0] || !table[0]) {
365 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
370 proto = sdp->sd_sb.sb_lockproto;
372 table = sdp->sd_sb.sb_locktable;
376 table = sdp->sd_vfs->s_id;
378 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
379 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
381 table = sdp->sd_table_name;
382 while ((table = strchr(table, '/')))
388 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
396 error = gfs2_glock_nq_num(sdp,
397 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
398 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
401 fs_err(sdp, "can't acquire mount glock: %d\n", error);
405 error = gfs2_glock_nq_num(sdp,
406 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
408 LM_FLAG_NOEXP | GL_EXACT,
411 fs_err(sdp, "can't acquire live glock: %d\n", error);
415 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
416 CREATE, &sdp->sd_rename_gl);
418 fs_err(sdp, "can't create rename glock: %d\n", error);
422 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
423 CREATE, &sdp->sd_freeze_gl);
425 fs_err(sdp, "can't create transaction glock: %d\n", error);
432 gfs2_glock_put(sdp->sd_freeze_gl);
434 gfs2_glock_put(sdp->sd_rename_gl);
436 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
438 gfs2_glock_dq_uninit(mount_gh);
443 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
444 u64 no_addr, const char *name)
446 struct gfs2_sbd *sdp = sb->s_fs_info;
447 struct dentry *dentry;
450 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
451 GFS2_BLKST_FREE /* ignore */);
453 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
454 return PTR_ERR(inode);
456 dentry = d_make_root(inode);
458 fs_err(sdp, "can't alloc %s dentry\n", name);
465 static int init_sb(struct gfs2_sbd *sdp, int silent)
467 struct super_block *sb = sdp->sd_vfs;
468 struct gfs2_holder sb_gh;
472 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
473 LM_ST_SHARED, 0, &sb_gh);
475 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
479 ret = gfs2_read_sb(sdp, silent);
481 fs_err(sdp, "can't read superblock: %d\n", ret);
485 /* Set up the buffer cache and SB for real */
486 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
488 fs_err(sdp, "FS block size (%u) is too small for device "
490 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
493 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
495 fs_err(sdp, "FS block size (%u) is too big for machine "
497 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
500 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
502 /* Get the root inode */
503 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
504 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
508 /* Get the master inode */
509 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
510 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
512 dput(sdp->sd_root_dir);
515 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
517 gfs2_glock_dq_uninit(&sb_gh);
521 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
523 char *message = "FIRSTMOUNT=Done";
524 char *envp[] = { message, NULL };
526 fs_info(sdp, "first mount done, others may mount\n");
528 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
529 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
531 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
535 * gfs2_jindex_hold - Grab a lock on the jindex
536 * @sdp: The GFS2 superblock
537 * @ji_gh: the holder for the jindex glock
542 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
544 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
547 struct gfs2_jdesc *jd;
552 mutex_lock(&sdp->sd_jindex_mutex);
555 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
559 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
560 name.hash = gfs2_disk_hash(name.name, name.len);
562 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
563 if (error == -ENOENT) {
568 gfs2_glock_dq_uninit(ji_gh);
574 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
578 INIT_LIST_HEAD(&jd->extent_list);
579 INIT_LIST_HEAD(&jd->jd_revoke_list);
581 INIT_WORK(&jd->jd_work, gfs2_recover_func);
582 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
583 if (IS_ERR_OR_NULL(jd->jd_inode)) {
587 error = PTR_ERR(jd->jd_inode);
592 spin_lock(&sdp->sd_jindex_spin);
593 jd->jd_jid = sdp->sd_journals++;
594 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
595 spin_unlock(&sdp->sd_jindex_spin);
598 mutex_unlock(&sdp->sd_jindex_mutex);
604 * check_journal_clean - Make sure a journal is clean for a spectator mount
605 * @sdp: The GFS2 superblock
606 * @jd: The journal descriptor
608 * Returns: 0 if the journal is clean or locked, else an error
610 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
613 struct gfs2_holder j_gh;
614 struct gfs2_log_header_host head;
615 struct gfs2_inode *ip;
617 ip = GFS2_I(jd->jd_inode);
618 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
619 GL_EXACT | GL_NOCACHE, &j_gh);
621 fs_err(sdp, "Error locking journal for spectator mount.\n");
624 error = gfs2_jdesc_check(jd);
626 fs_err(sdp, "Error checking journal for spectator mount.\n");
629 error = gfs2_find_jhead(jd, &head, false);
631 fs_err(sdp, "Error parsing journal for spectator mount.\n");
634 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
636 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
637 "must not be a spectator.\n", jd->jd_jid);
641 gfs2_glock_dq_uninit(&j_gh);
645 static int init_journal(struct gfs2_sbd *sdp, int undo)
647 struct inode *master = d_inode(sdp->sd_master_dir);
648 struct gfs2_holder ji_gh;
649 struct gfs2_inode *ip;
658 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
659 if (IS_ERR(sdp->sd_jindex)) {
660 fs_err(sdp, "can't lookup journal index: %d\n", error);
661 return PTR_ERR(sdp->sd_jindex);
664 /* Load in the journal index special file */
666 error = gfs2_jindex_hold(sdp, &ji_gh);
668 fs_err(sdp, "can't read journal index: %d\n", error);
673 if (!gfs2_jindex_size(sdp)) {
674 fs_err(sdp, "no journals!\n");
678 atomic_set(&sdp->sd_log_blks_needed, 0);
679 if (sdp->sd_args.ar_spectator) {
680 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
681 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
682 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
683 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
685 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
686 fs_err(sdp, "can't mount journal #%u\n",
687 sdp->sd_lockstruct.ls_jid);
688 fs_err(sdp, "there are only %u journals (0 - %u)\n",
689 gfs2_jindex_size(sdp),
690 gfs2_jindex_size(sdp) - 1);
693 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
695 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
697 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
698 &sdp->sd_journal_gh);
700 fs_err(sdp, "can't acquire journal glock: %d\n", error);
704 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
705 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
706 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
709 fs_err(sdp, "can't acquire journal inode glock: %d\n",
711 goto fail_journal_gh;
714 error = gfs2_jdesc_check(sdp->sd_jdesc);
716 fs_err(sdp, "my journal (%u) is bad: %d\n",
717 sdp->sd_jdesc->jd_jid, error);
720 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
721 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
722 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
724 /* Map the extents for this journal's blocks */
725 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
727 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
729 if (sdp->sd_lockstruct.ls_first) {
731 for (x = 0; x < sdp->sd_journals; x++) {
732 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
734 if (sdp->sd_args.ar_spectator) {
735 error = check_journal_clean(sdp, jd);
740 error = gfs2_recover_journal(jd, true);
742 fs_err(sdp, "error recovering journal %u: %d\n",
748 gfs2_others_may_mount(sdp);
749 } else if (!sdp->sd_args.ar_spectator) {
750 error = gfs2_recover_journal(sdp->sd_jdesc, true);
752 fs_err(sdp, "error recovering my journal: %d\n", error);
757 sdp->sd_log_idle = 1;
758 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
759 gfs2_glock_dq_uninit(&ji_gh);
761 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
765 if (!sdp->sd_args.ar_spectator)
766 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
768 if (!sdp->sd_args.ar_spectator)
769 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
771 gfs2_jindex_free(sdp);
773 gfs2_glock_dq_uninit(&ji_gh);
775 iput(sdp->sd_jindex);
779 static struct lock_class_key gfs2_quota_imutex_key;
781 static int init_inodes(struct gfs2_sbd *sdp, int undo)
784 struct inode *master = d_inode(sdp->sd_master_dir);
789 error = init_journal(sdp, undo);
790 complete_all(&sdp->sd_journal_ready);
794 /* Read in the master statfs inode */
795 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
796 if (IS_ERR(sdp->sd_statfs_inode)) {
797 error = PTR_ERR(sdp->sd_statfs_inode);
798 fs_err(sdp, "can't read in statfs inode: %d\n", error);
802 /* Read in the resource index inode */
803 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
804 if (IS_ERR(sdp->sd_rindex)) {
805 error = PTR_ERR(sdp->sd_rindex);
806 fs_err(sdp, "can't get resource index inode: %d\n", error);
809 sdp->sd_rindex_uptodate = 0;
811 /* Read in the quota inode */
812 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
813 if (IS_ERR(sdp->sd_quota_inode)) {
814 error = PTR_ERR(sdp->sd_quota_inode);
815 fs_err(sdp, "can't get quota file inode: %d\n", error);
819 * i_rwsem on quota files is special. Since this inode is hidden system
820 * file, we are safe to define locking ourselves.
822 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
823 &gfs2_quota_imutex_key);
825 error = gfs2_rindex_update(sdp);
832 iput(sdp->sd_quota_inode);
834 gfs2_clear_rgrpd(sdp);
835 iput(sdp->sd_rindex);
837 iput(sdp->sd_statfs_inode);
839 init_journal(sdp, UNDO);
844 static int init_per_node(struct gfs2_sbd *sdp, int undo)
846 struct inode *pn = NULL;
849 struct gfs2_inode *ip;
850 struct inode *master = d_inode(sdp->sd_master_dir);
852 if (sdp->sd_args.ar_spectator)
858 pn = gfs2_lookup_simple(master, "per_node");
861 fs_err(sdp, "can't find per_node directory: %d\n", error);
865 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
866 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
867 if (IS_ERR(sdp->sd_sc_inode)) {
868 error = PTR_ERR(sdp->sd_sc_inode);
869 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
873 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
874 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
875 if (IS_ERR(sdp->sd_qc_inode)) {
876 error = PTR_ERR(sdp->sd_qc_inode);
877 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
884 ip = GFS2_I(sdp->sd_sc_inode);
885 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
888 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
892 ip = GFS2_I(sdp->sd_qc_inode);
893 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
896 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
903 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
905 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
907 iput(sdp->sd_qc_inode);
909 iput(sdp->sd_sc_inode);
915 static const match_table_t nolock_tokens = {
916 { Opt_jid, "jid=%d\n", },
920 static const struct lm_lockops nolock_ops = {
921 .lm_proto_name = "lock_nolock",
922 .lm_put_lock = gfs2_glock_free,
923 .lm_tokens = &nolock_tokens,
927 * gfs2_lm_mount - mount a locking protocol
928 * @sdp: the filesystem
929 * @args: mount arguments
930 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
935 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
937 const struct lm_lockops *lm;
938 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
939 struct gfs2_args *args = &sdp->sd_args;
940 const char *proto = sdp->sd_proto_name;
941 const char *table = sdp->sd_table_name;
945 if (!strcmp("lock_nolock", proto)) {
947 sdp->sd_args.ar_localflocks = 1;
948 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
949 } else if (!strcmp("lock_dlm", proto)) {
953 pr_info("can't find protocol %s\n", proto);
957 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
962 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
963 substring_t tmp[MAX_OPT_ARGS];
969 token = match_token(o, *lm->lm_tokens, tmp);
972 ret = match_int(&tmp[0], &option);
973 if (ret || option < 0)
975 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
980 /* Obsolete, but left for backward compat purposes */
983 ret = match_int(&tmp[0], &option);
984 if (ret || (option != 0 && option != 1))
986 ls->ls_first = option;
991 fs_info(sdp, "unknown hostdata (%s)\n", o);
996 if (lm->lm_mount == NULL) {
997 fs_info(sdp, "Now mounting FS...\n");
998 complete_all(&sdp->sd_locking_init);
1001 ret = lm->lm_mount(sdp, table);
1003 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1004 complete_all(&sdp->sd_locking_init);
1008 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1010 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1011 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1012 lm->lm_unmount(sdp);
1015 static int wait_on_journal(struct gfs2_sbd *sdp)
1017 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1020 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1024 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1026 struct super_block *sb = sdp->sd_vfs;
1029 char *envp[] = { ro, spectator, NULL };
1030 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1031 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1032 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1036 * gfs2_fill_super - Read in superblock
1037 * @sb: The VFS superblock
1038 * @args: Mount options
1039 * @silent: Don't complain if it's not a GFS2 filesystem
1043 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1045 struct gfs2_args *args = fc->fs_private;
1046 int silent = fc->sb_flags & SB_SILENT;
1047 struct gfs2_sbd *sdp;
1048 struct gfs2_holder mount_gh;
1053 pr_warn("can't alloc struct gfs2_sbd\n");
1056 sdp->sd_args = *args;
1058 if (sdp->sd_args.ar_spectator) {
1059 sb->s_flags |= SB_RDONLY;
1060 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1062 if (sdp->sd_args.ar_posix_acl)
1063 sb->s_flags |= SB_POSIXACL;
1064 if (sdp->sd_args.ar_nobarrier)
1065 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1067 sb->s_flags |= SB_NOSEC;
1068 sb->s_magic = GFS2_MAGIC;
1069 sb->s_op = &gfs2_super_ops;
1070 sb->s_d_op = &gfs2_dops;
1071 sb->s_export_op = &gfs2_export_ops;
1072 sb->s_xattr = gfs2_xattr_handlers;
1073 sb->s_qcop = &gfs2_quotactl_ops;
1074 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1075 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1076 sb->s_time_gran = 1;
1077 sb->s_maxbytes = MAX_LFS_FILESIZE;
1079 /* Set up the buffer cache and fill in some fake block size values
1080 to allow us to read-in the on-disk superblock. */
1081 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1082 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1083 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1084 GFS2_BASIC_BLOCK_SHIFT;
1085 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1087 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1088 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1089 if (sdp->sd_args.ar_statfs_quantum) {
1090 sdp->sd_tune.gt_statfs_slow = 0;
1091 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1093 sdp->sd_tune.gt_statfs_slow = 1;
1094 sdp->sd_tune.gt_statfs_quantum = 30;
1097 error = init_names(sdp, silent);
1099 /* In this case, we haven't initialized sysfs, so we have to
1100 manually free the sdp. */
1102 sb->s_fs_info = NULL;
1106 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1108 error = gfs2_sys_fs_add(sdp);
1110 * If we hit an error here, gfs2_sys_fs_add will have called function
1111 * kobject_put which causes the sysfs usage count to go to zero, which
1112 * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1113 * Subsequent error paths here will call gfs2_sys_fs_del, which also
1114 * kobject_put to free sdp.
1119 gfs2_create_debugfs_file(sdp);
1121 error = gfs2_lm_mount(sdp, silent);
1125 error = init_locking(sdp, &mount_gh, DO);
1129 error = init_sb(sdp, silent);
1133 error = wait_on_journal(sdp);
1138 * If user space has failed to join the cluster or some similar
1139 * failure has occurred, then the journal id will contain a
1140 * negative (error) number. This will then be returned to the
1141 * caller (of the mount syscall). We do this even for spectator
1142 * mounts (which just write a jid of 0 to indicate "ok" even though
1143 * the jid is unused in the spectator case)
1145 if (sdp->sd_lockstruct.ls_jid < 0) {
1146 error = sdp->sd_lockstruct.ls_jid;
1147 sdp->sd_lockstruct.ls_jid = 0;
1151 if (sdp->sd_args.ar_spectator)
1152 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1153 sdp->sd_table_name);
1155 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1156 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1158 error = init_inodes(sdp, DO);
1162 error = init_per_node(sdp, DO);
1166 error = gfs2_statfs_init(sdp);
1168 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1172 if (!sb_rdonly(sb)) {
1173 error = gfs2_make_fs_rw(sdp);
1175 fs_err(sdp, "can't make FS RW: %d\n", error);
1180 gfs2_glock_dq_uninit(&mount_gh);
1181 gfs2_online_uevent(sdp);
1185 init_per_node(sdp, UNDO);
1187 init_inodes(sdp, UNDO);
1189 if (sdp->sd_root_dir)
1190 dput(sdp->sd_root_dir);
1191 if (sdp->sd_master_dir)
1192 dput(sdp->sd_master_dir);
1197 init_locking(sdp, &mount_gh, UNDO);
1199 complete_all(&sdp->sd_journal_ready);
1200 gfs2_gl_hash_clear(sdp);
1201 gfs2_lm_unmount(sdp);
1203 gfs2_delete_debugfs_file(sdp);
1204 /* gfs2_sys_fs_del must be the last thing we do, since it causes
1205 * sysfs to call function gfs2_sbd_release, which frees sdp. */
1206 gfs2_sys_fs_del(sdp);
1207 sb->s_fs_info = NULL;
1212 * gfs2_get_tree - Get the GFS2 superblock and root directory
1213 * @fc: The filesystem context
1215 * Returns: 0 or -errno on error
1217 static int gfs2_get_tree(struct fs_context *fc)
1219 struct gfs2_args *args = fc->fs_private;
1220 struct gfs2_sbd *sdp;
1223 error = get_tree_bdev(fc, gfs2_fill_super);
1227 sdp = fc->root->d_sb->s_fs_info;
1230 fc->root = dget(sdp->sd_master_dir);
1232 fc->root = dget(sdp->sd_root_dir);
1236 static void gfs2_fc_free(struct fs_context *fc)
1238 struct gfs2_args *args = fc->fs_private;
1248 Opt_ignore_local_fs,
1270 Opt_quota_unset = 0,
1276 static const unsigned int opt_quota_values[] = {
1277 [Opt_quota_off] = GFS2_QUOTA_OFF,
1278 [Opt_quota_account] = GFS2_QUOTA_ACCOUNT,
1279 [Opt_quota_on] = GFS2_QUOTA_ON,
1283 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1284 Opt_data_ordered = GFS2_DATA_ORDERED,
1288 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1289 Opt_errors_panic = GFS2_ERRORS_PANIC,
1292 static const struct fs_parameter_spec gfs2_param_specs[] = {
1293 fsparam_string ("lockproto", Opt_lockproto),
1294 fsparam_string ("locktable", Opt_locktable),
1295 fsparam_string ("hostdata", Opt_hostdata),
1296 fsparam_flag ("spectator", Opt_spectator),
1297 fsparam_flag ("norecovery", Opt_spectator),
1298 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1299 fsparam_flag ("localflocks", Opt_localflocks),
1300 fsparam_flag ("localcaching", Opt_localcaching),
1301 fsparam_flag_no("debug", Opt_debug),
1302 fsparam_flag ("upgrade", Opt_upgrade),
1303 fsparam_flag_no("acl", Opt_acl),
1304 fsparam_flag_no("suiddir", Opt_suiddir),
1305 fsparam_enum ("data", Opt_data),
1306 fsparam_flag ("meta", Opt_meta),
1307 fsparam_flag_no("discard", Opt_discard),
1308 fsparam_s32 ("commit", Opt_commit),
1309 fsparam_enum ("errors", Opt_errors),
1310 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1311 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1312 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1313 fsparam_flag_no("barrier", Opt_barrier),
1314 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1315 fsparam_flag_no("loccookie", Opt_loccookie),
1316 /* quota can be a flag or an enum so it gets special treatment */
1317 __fsparam(fs_param_is_enum, "quota", Opt_quota, fs_param_neg_with_no|fs_param_v_optional),
1321 static const struct fs_parameter_enum gfs2_param_enums[] = {
1322 { Opt_quota, "off", Opt_quota_off },
1323 { Opt_quota, "account", Opt_quota_account },
1324 { Opt_quota, "on", Opt_quota_on },
1325 { Opt_data, "writeback", Opt_data_writeback },
1326 { Opt_data, "ordered", Opt_data_ordered },
1327 { Opt_errors, "withdraw", Opt_errors_withdraw },
1328 { Opt_errors, "panic", Opt_errors_panic },
1332 static const struct fs_parameter_description gfs2_fs_parameters = {
1334 .specs = gfs2_param_specs,
1335 .enums = gfs2_param_enums,
1338 /* Parse a single mount parameter */
1339 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1341 struct gfs2_args *args = fc->fs_private;
1342 struct fs_parse_result result;
1345 o = fs_parse(fc, &gfs2_fs_parameters, param, &result);
1351 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1354 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1357 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1360 args->ar_spectator = 1;
1362 case Opt_ignore_local_fs:
1363 /* Retained for backwards compat only */
1365 case Opt_localflocks:
1366 args->ar_localflocks = 1;
1368 case Opt_localcaching:
1369 /* Retained for backwards compat only */
1372 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1373 return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
1374 args->ar_debug = result.boolean;
1377 /* Retained for backwards compat only */
1380 args->ar_posix_acl = result.boolean;
1383 /* The quota option can be a flag or an enum. A non-zero int_32
1384 result means that we have an enum index. Otherwise we have
1385 to rely on the 'negated' flag to tell us whether 'quota' or
1386 'noquota' was specified. */
1388 args->ar_quota = GFS2_QUOTA_OFF;
1389 else if (result.int_32 > 0)
1390 args->ar_quota = opt_quota_values[result.int_32];
1392 args->ar_quota = GFS2_QUOTA_ON;
1395 args->ar_suiddir = result.boolean;
1398 /* The uint_32 result maps directly to GFS2_DATA_* */
1399 args->ar_data = result.uint_32;
1405 args->ar_discard = result.boolean;
1408 if (result.int_32 <= 0)
1409 return invalf(fc, "gfs2: commit mount option requires a positive numeric argument");
1410 args->ar_commit = result.int_32;
1412 case Opt_statfs_quantum:
1413 if (result.int_32 < 0)
1414 return invalf(fc, "gfs2: statfs_quantum mount option requires a non-negative numeric argument");
1415 args->ar_statfs_quantum = result.int_32;
1417 case Opt_quota_quantum:
1418 if (result.int_32 <= 0)
1419 return invalf(fc, "gfs2: quota_quantum mount option requires a positive numeric argument");
1420 args->ar_quota_quantum = result.int_32;
1422 case Opt_statfs_percent:
1423 if (result.int_32 < 0 || result.int_32 > 100)
1424 return invalf(fc, "gfs2: statfs_percent mount option requires a numeric argument between 0 and 100");
1425 args->ar_statfs_percent = result.int_32;
1428 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1429 return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
1430 args->ar_errors = result.uint_32;
1433 args->ar_nobarrier = result.boolean;
1436 args->ar_rgrplvb = result.boolean;
1439 args->ar_loccookie = result.boolean;
1442 return invalf(fc, "gfs2: invalid mount option: %s", param->key);
1447 static int gfs2_reconfigure(struct fs_context *fc)
1449 struct super_block *sb = fc->root->d_sb;
1450 struct gfs2_sbd *sdp = sb->s_fs_info;
1451 struct gfs2_args *oldargs = &sdp->sd_args;
1452 struct gfs2_args *newargs = fc->fs_private;
1453 struct gfs2_tune *gt = &sdp->sd_tune;
1456 sync_filesystem(sb);
1458 spin_lock(>->gt_spin);
1459 oldargs->ar_commit = gt->gt_logd_secs;
1460 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1461 if (gt->gt_statfs_slow)
1462 oldargs->ar_statfs_quantum = 0;
1464 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1465 spin_unlock(>->gt_spin);
1467 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1468 errorf(fc, "gfs2: reconfiguration of locking protocol not allowed");
1471 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1472 errorf(fc, "gfs2: reconfiguration of lock table not allowed");
1475 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1476 errorf(fc, "gfs2: reconfiguration of host data not allowed");
1479 if (newargs->ar_spectator != oldargs->ar_spectator) {
1480 errorf(fc, "gfs2: reconfiguration of spectator mode not allowed");
1483 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1484 errorf(fc, "gfs2: reconfiguration of localflocks not allowed");
1487 if (newargs->ar_meta != oldargs->ar_meta) {
1488 errorf(fc, "gfs2: switching between gfs2 and gfs2meta not allowed");
1491 if (oldargs->ar_spectator)
1492 fc->sb_flags |= SB_RDONLY;
1494 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1495 if (fc->sb_flags & SB_RDONLY) {
1496 error = gfs2_make_fs_ro(sdp);
1498 errorf(fc, "gfs2: unable to remount read-only");
1500 error = gfs2_make_fs_rw(sdp);
1502 errorf(fc, "gfs2: unable to remount read-write");
1505 sdp->sd_args = *newargs;
1507 if (sdp->sd_args.ar_posix_acl)
1508 sb->s_flags |= SB_POSIXACL;
1510 sb->s_flags &= ~SB_POSIXACL;
1511 if (sdp->sd_args.ar_nobarrier)
1512 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1514 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1515 spin_lock(>->gt_spin);
1516 gt->gt_logd_secs = newargs->ar_commit;
1517 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1518 if (newargs->ar_statfs_quantum) {
1519 gt->gt_statfs_slow = 0;
1520 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1523 gt->gt_statfs_slow = 1;
1524 gt->gt_statfs_quantum = 30;
1526 spin_unlock(>->gt_spin);
1528 gfs2_online_uevent(sdp);
1532 static const struct fs_context_operations gfs2_context_ops = {
1533 .free = gfs2_fc_free,
1534 .parse_param = gfs2_parse_param,
1535 .get_tree = gfs2_get_tree,
1536 .reconfigure = gfs2_reconfigure,
1539 /* Set up the filesystem mount context */
1540 static int gfs2_init_fs_context(struct fs_context *fc)
1542 struct gfs2_args *args;
1544 args = kmalloc(sizeof(*args), GFP_KERNEL);
1548 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1549 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1551 *args = sdp->sd_args;
1553 memset(args, 0, sizeof(*args));
1554 args->ar_quota = GFS2_QUOTA_DEFAULT;
1555 args->ar_data = GFS2_DATA_DEFAULT;
1556 args->ar_commit = 30;
1557 args->ar_statfs_quantum = 30;
1558 args->ar_quota_quantum = 60;
1559 args->ar_errors = GFS2_ERRORS_DEFAULT;
1561 fc->fs_private = args;
1562 fc->ops = &gfs2_context_ops;
1566 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1571 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1573 return (fc->sget_key == s->s_bdev);
1576 static int gfs2_meta_get_tree(struct fs_context *fc)
1578 struct super_block *s;
1579 struct gfs2_sbd *sdp;
1583 if (!fc->source || !*fc->source)
1586 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1588 pr_warn("path_lookup on %s returned error %d\n",
1592 fc->fs_type = &gfs2_fs_type;
1593 fc->sget_key = path.dentry->d_sb->s_bdev;
1594 s = sget_fc(fc, test_meta_super, set_meta_super);
1597 pr_warn("gfs2 mount does not exist\n");
1600 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1601 deactivate_locked_super(s);
1605 fc->root = dget(sdp->sd_master_dir);
1609 static const struct fs_context_operations gfs2_meta_context_ops = {
1610 .free = gfs2_fc_free,
1611 .get_tree = gfs2_meta_get_tree,
1614 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1616 int ret = gfs2_init_fs_context(fc);
1621 fc->ops = &gfs2_meta_context_ops;
1625 static void gfs2_kill_sb(struct super_block *sb)
1627 struct gfs2_sbd *sdp = sb->s_fs_info;
1630 kill_block_super(sb);
1634 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1635 dput(sdp->sd_root_dir);
1636 dput(sdp->sd_master_dir);
1637 sdp->sd_root_dir = NULL;
1638 sdp->sd_master_dir = NULL;
1639 shrink_dcache_sb(sb);
1640 kill_block_super(sb);
1643 struct file_system_type gfs2_fs_type = {
1645 .fs_flags = FS_REQUIRES_DEV,
1646 .init_fs_context = gfs2_init_fs_context,
1647 .parameters = &gfs2_fs_parameters,
1648 .kill_sb = gfs2_kill_sb,
1649 .owner = THIS_MODULE,
1651 MODULE_ALIAS_FS("gfs2");
1653 struct file_system_type gfs2meta_fs_type = {
1655 .fs_flags = FS_REQUIRES_DEV,
1656 .init_fs_context = gfs2_meta_init_fs_context,
1657 .owner = THIS_MODULE,
1659 MODULE_ALIAS_FS("gfs2meta");