2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/blkdev.h>
16 #include <linux/kthread.h>
17 #include <linux/export.h>
18 #include <linux/namei.h>
19 #include <linux/mount.h>
20 #include <linux/gfs2_ondisk.h>
21 #include <linux/quotaops.h>
22 #include <linux/lockdep.h>
23 #include <linux/module.h>
40 #include "trace_gfs2.h"
46 * gfs2_tune_init - Fill a gfs2_tune structure with default values
51 static void gfs2_tune_init(struct gfs2_tune *gt)
53 spin_lock_init(>->gt_spin);
55 gt->gt_quota_warn_period = 10;
56 gt->gt_quota_scale_num = 1;
57 gt->gt_quota_scale_den = 1;
58 gt->gt_new_files_jdata = 0;
59 gt->gt_max_readahead = 1 << 18;
60 gt->gt_complain_secs = 10;
63 static struct gfs2_sbd *init_sbd(struct super_block *sb)
66 struct address_space *mapping;
68 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
74 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
75 if (!sdp->sd_lkstats) {
80 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
81 gfs2_tune_init(&sdp->sd_tune);
83 init_waitqueue_head(&sdp->sd_glock_wait);
84 atomic_set(&sdp->sd_glock_disposal, 0);
85 init_completion(&sdp->sd_locking_init);
86 init_completion(&sdp->sd_wdack);
87 spin_lock_init(&sdp->sd_statfs_spin);
89 spin_lock_init(&sdp->sd_rindex_spin);
90 sdp->sd_rindex_tree.rb_node = NULL;
92 INIT_LIST_HEAD(&sdp->sd_jindex_list);
93 spin_lock_init(&sdp->sd_jindex_spin);
94 mutex_init(&sdp->sd_jindex_mutex);
96 INIT_LIST_HEAD(&sdp->sd_quota_list);
97 mutex_init(&sdp->sd_quota_mutex);
98 mutex_init(&sdp->sd_quota_sync_mutex);
99 init_waitqueue_head(&sdp->sd_quota_wait);
100 INIT_LIST_HEAD(&sdp->sd_trunc_list);
101 spin_lock_init(&sdp->sd_trunc_lock);
102 spin_lock_init(&sdp->sd_bitmap_lock);
104 mapping = &sdp->sd_aspace;
106 address_space_init_once(mapping);
107 mapping->a_ops = &gfs2_rgrp_aops;
108 mapping->host = sb->s_bdev->bd_inode;
110 mapping_set_gfp_mask(mapping, GFP_NOFS);
111 mapping->private_data = NULL;
112 mapping->backing_dev_info = sb->s_bdi;
113 mapping->writeback_index = 0;
115 spin_lock_init(&sdp->sd_log_lock);
116 atomic_set(&sdp->sd_log_pinned, 0);
117 INIT_LIST_HEAD(&sdp->sd_log_le_buf);
118 INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
119 INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
120 INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
121 spin_lock_init(&sdp->sd_ordered_lock);
123 init_waitqueue_head(&sdp->sd_log_waitq);
124 init_waitqueue_head(&sdp->sd_logd_waitq);
125 spin_lock_init(&sdp->sd_ail_lock);
126 INIT_LIST_HEAD(&sdp->sd_ail1_list);
127 INIT_LIST_HEAD(&sdp->sd_ail2_list);
129 init_rwsem(&sdp->sd_log_flush_lock);
130 atomic_set(&sdp->sd_log_in_flight, 0);
131 init_waitqueue_head(&sdp->sd_log_flush_wait);
133 INIT_LIST_HEAD(&sdp->sd_revoke_list);
140 * gfs2_check_sb - Check superblock
141 * @sdp: the filesystem
142 * @sb: The superblock
143 * @silent: Don't print a message if the check fails
145 * Checks the version code of the FS is one that we understand how to
146 * read and that the sizes of the various on-disk structures have not
150 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
152 struct gfs2_sb_host *sb = &sdp->sd_sb;
154 if (sb->sb_magic != GFS2_MAGIC ||
155 sb->sb_type != GFS2_METATYPE_SB) {
157 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
161 /* If format numbers match exactly, we're done. */
163 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
164 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
167 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
172 static void end_bio_io_page(struct bio *bio, int error)
174 struct page *page = bio->bi_private;
177 SetPageUptodate(page);
179 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
183 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
185 struct gfs2_sb_host *sb = &sdp->sd_sb;
186 struct super_block *s = sdp->sd_vfs;
187 const struct gfs2_sb *str = buf;
189 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
190 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
191 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
192 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
193 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
194 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
195 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
196 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
197 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
198 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
199 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
201 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
202 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
203 memcpy(s->s_uuid, str->sb_uuid, 16);
207 * gfs2_read_super - Read the gfs2 super block from disk
208 * @sdp: The GFS2 super block
209 * @sector: The location of the super block
210 * @error: The error code to return
212 * This uses the bio functions to read the super block from disk
213 * because we want to be 100% sure that we never read cached data.
214 * A super block is read twice only during each GFS2 mount and is
215 * never written to by the filesystem. The first time its read no
216 * locks are held, and the only details which are looked at are those
217 * relating to the locking protocol. Once locking is up and working,
218 * the sb is read again under the lock to establish the location of
219 * the master directory (contains pointers to journals etc) and the
222 * Returns: 0 on success or error
225 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
227 struct super_block *sb = sdp->sd_vfs;
232 page = alloc_page(GFP_NOFS);
236 ClearPageUptodate(page);
237 ClearPageDirty(page);
240 bio = bio_alloc(GFP_NOFS, 1);
241 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
242 bio->bi_bdev = sb->s_bdev;
243 bio_add_page(bio, page, PAGE_SIZE, 0);
245 bio->bi_end_io = end_bio_io_page;
246 bio->bi_private = page;
247 submit_bio(READ_SYNC | REQ_META, bio);
248 wait_on_page_locked(page);
250 if (!PageUptodate(page)) {
258 return gfs2_check_sb(sdp, silent);
262 * gfs2_read_sb - Read super block
263 * @sdp: The GFS2 superblock
264 * @silent: Don't print message if mount fails
268 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
270 u32 hash_blocks, ind_blocks, leaf_blocks;
275 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
278 fs_err(sdp, "can't read superblock\n");
282 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
283 GFS2_BASIC_BLOCK_SHIFT;
284 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
285 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
286 sizeof(struct gfs2_dinode)) / sizeof(u64);
287 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
288 sizeof(struct gfs2_meta_header)) / sizeof(u64);
289 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
290 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
291 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
292 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
293 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
294 sizeof(struct gfs2_meta_header)) /
295 sizeof(struct gfs2_quota_change);
296 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
297 sizeof(struct gfs2_meta_header))
298 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
300 /* Compute maximum reservation required to add a entry to a directory */
302 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
306 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
307 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
308 ind_blocks += tmp_blocks;
311 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
313 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
315 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
316 sizeof(struct gfs2_dinode);
317 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
322 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
324 m = do_div(d, sdp->sd_inptrs);
326 if (d != sdp->sd_heightsize[x - 1] || m)
328 sdp->sd_heightsize[x] = space;
330 sdp->sd_max_height = x;
331 sdp->sd_heightsize[x] = ~0;
332 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
334 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
335 sizeof(struct gfs2_dinode);
336 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
341 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
343 m = do_div(d, sdp->sd_inptrs);
345 if (d != sdp->sd_jheightsize[x - 1] || m)
347 sdp->sd_jheightsize[x] = space;
349 sdp->sd_max_jheight = x;
350 sdp->sd_jheightsize[x] = ~0;
351 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
356 static int init_names(struct gfs2_sbd *sdp, int silent)
361 proto = sdp->sd_args.ar_lockproto;
362 table = sdp->sd_args.ar_locktable;
364 /* Try to autodetect */
366 if (!proto[0] || !table[0]) {
367 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
372 proto = sdp->sd_sb.sb_lockproto;
374 table = sdp->sd_sb.sb_locktable;
378 table = sdp->sd_vfs->s_id;
380 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
381 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
383 table = sdp->sd_table_name;
384 while ((table = strchr(table, '/')))
390 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
398 error = gfs2_glock_nq_num(sdp,
399 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
400 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
403 fs_err(sdp, "can't acquire mount glock: %d\n", error);
407 error = gfs2_glock_nq_num(sdp,
408 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
410 LM_FLAG_NOEXP | GL_EXACT,
413 fs_err(sdp, "can't acquire live glock: %d\n", error);
417 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
418 CREATE, &sdp->sd_rename_gl);
420 fs_err(sdp, "can't create rename glock: %d\n", error);
424 error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
425 CREATE, &sdp->sd_trans_gl);
427 fs_err(sdp, "can't create transaction glock: %d\n", error);
434 gfs2_glock_put(sdp->sd_trans_gl);
436 gfs2_glock_put(sdp->sd_rename_gl);
438 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
440 gfs2_glock_dq_uninit(mount_gh);
445 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
446 u64 no_addr, const char *name)
448 struct gfs2_sbd *sdp = sb->s_fs_info;
449 struct dentry *dentry;
452 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
454 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
455 return PTR_ERR(inode);
457 dentry = d_make_root(inode);
459 fs_err(sdp, "can't alloc %s dentry\n", name);
466 static int init_sb(struct gfs2_sbd *sdp, int silent)
468 struct super_block *sb = sdp->sd_vfs;
469 struct gfs2_holder sb_gh;
473 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
474 LM_ST_SHARED, 0, &sb_gh);
476 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
480 ret = gfs2_read_sb(sdp, silent);
482 fs_err(sdp, "can't read superblock: %d\n", ret);
486 /* Set up the buffer cache and SB for real */
487 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
489 fs_err(sdp, "FS block size (%u) is too small for device "
491 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
494 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
496 fs_err(sdp, "FS block size (%u) is too big for machine "
498 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
501 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
503 /* Get the root inode */
504 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
505 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
509 /* Get the master inode */
510 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
511 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
513 dput(sdp->sd_root_dir);
516 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
518 gfs2_glock_dq_uninit(&sb_gh);
523 * map_journal_extents - create a reusable "extent" mapping from all logical
524 * blocks to all physical blocks for the given journal. This will save
525 * us time when writing journal blocks. Most journals will have only one
526 * extent that maps all their logical blocks. That's because gfs2.mkfs
527 * arranges the journal blocks sequentially to maximize performance.
528 * So the extent would map the first block for the entire file length.
529 * However, gfs2_jadd can happen while file activity is happening, so
530 * those journals may not be sequential. Less likely is the case where
531 * the users created their own journals by mounting the metafs and
532 * laying it out. But it's still possible. These journals might have
535 * TODO: This should be done in bigger chunks rather than one block at a time,
536 * but since it's only done at mount time, I'm not worried about the
539 static int map_journal_extents(struct gfs2_sbd *sdp)
541 struct gfs2_jdesc *jd = sdp->sd_jdesc;
543 u64 db, prev_db; /* logical block, disk block, prev disk block */
544 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
545 struct gfs2_journal_extent *jext = NULL;
546 struct buffer_head bh;
551 for (lb = 0; lb < i_size_read(jd->jd_inode) >> sdp->sd_sb.sb_bsize_shift; lb++) {
554 bh.b_size = 1 << ip->i_inode.i_blkbits;
555 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
558 printk(KERN_INFO "GFS2 journal mapping error %d: lb="
559 "%u db=%llu\n", rc, lb, (unsigned long long)db);
562 if (!prev_db || db != prev_db + 1) {
563 jext = kzalloc(sizeof(struct gfs2_journal_extent),
566 printk(KERN_INFO "GFS2 error: out of memory "
567 "mapping journal extents.\n");
574 list_add_tail(&jext->extent_list, &jd->extent_list);
583 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
585 char *message = "FIRSTMOUNT=Done";
586 char *envp[] = { message, NULL };
588 fs_info(sdp, "first mount done, others may mount\n");
590 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
591 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
593 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
597 * gfs2_jindex_hold - Grab a lock on the jindex
598 * @sdp: The GFS2 superblock
599 * @ji_gh: the holder for the jindex glock
604 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
606 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
609 struct gfs2_jdesc *jd;
614 mutex_lock(&sdp->sd_jindex_mutex);
617 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
621 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
622 name.hash = gfs2_disk_hash(name.name, name.len);
624 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
625 if (error == -ENOENT) {
630 gfs2_glock_dq_uninit(ji_gh);
636 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
640 INIT_LIST_HEAD(&jd->extent_list);
641 INIT_WORK(&jd->jd_work, gfs2_recover_func);
642 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
643 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
647 error = PTR_ERR(jd->jd_inode);
652 spin_lock(&sdp->sd_jindex_spin);
653 jd->jd_jid = sdp->sd_journals++;
654 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
655 spin_unlock(&sdp->sd_jindex_spin);
658 mutex_unlock(&sdp->sd_jindex_mutex);
664 * check_journal_clean - Make sure a journal is clean for a spectator mount
665 * @sdp: The GFS2 superblock
666 * @jd: The journal descriptor
668 * Returns: 0 if the journal is clean or locked, else an error
670 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
673 struct gfs2_holder j_gh;
674 struct gfs2_log_header_host head;
675 struct gfs2_inode *ip;
677 ip = GFS2_I(jd->jd_inode);
678 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
679 GL_EXACT | GL_NOCACHE, &j_gh);
681 fs_err(sdp, "Error locking journal for spectator mount.\n");
684 error = gfs2_jdesc_check(jd);
686 fs_err(sdp, "Error checking journal for spectator mount.\n");
689 error = gfs2_find_jhead(jd, &head);
691 fs_err(sdp, "Error parsing journal for spectator mount.\n");
694 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
696 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
697 "must not be a spectator.\n", jd->jd_jid);
701 gfs2_glock_dq_uninit(&j_gh);
705 static int init_journal(struct gfs2_sbd *sdp, int undo)
707 struct inode *master = sdp->sd_master_dir->d_inode;
708 struct gfs2_holder ji_gh;
709 struct gfs2_inode *ip;
718 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
719 if (IS_ERR(sdp->sd_jindex)) {
720 fs_err(sdp, "can't lookup journal index: %d\n", error);
721 return PTR_ERR(sdp->sd_jindex);
724 /* Load in the journal index special file */
726 error = gfs2_jindex_hold(sdp, &ji_gh);
728 fs_err(sdp, "can't read journal index: %d\n", error);
733 if (!gfs2_jindex_size(sdp)) {
734 fs_err(sdp, "no journals!\n");
738 if (sdp->sd_args.ar_spectator) {
739 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
740 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
741 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
742 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
744 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
745 fs_err(sdp, "can't mount journal #%u\n",
746 sdp->sd_lockstruct.ls_jid);
747 fs_err(sdp, "there are only %u journals (0 - %u)\n",
748 gfs2_jindex_size(sdp),
749 gfs2_jindex_size(sdp) - 1);
752 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
754 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
756 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
757 &sdp->sd_journal_gh);
759 fs_err(sdp, "can't acquire journal glock: %d\n", error);
763 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
764 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
765 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
768 fs_err(sdp, "can't acquire journal inode glock: %d\n",
770 goto fail_journal_gh;
773 error = gfs2_jdesc_check(sdp->sd_jdesc);
775 fs_err(sdp, "my journal (%u) is bad: %d\n",
776 sdp->sd_jdesc->jd_jid, error);
779 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
780 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
781 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
783 /* Map the extents for this journal's blocks */
784 map_journal_extents(sdp);
786 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
788 if (sdp->sd_lockstruct.ls_first) {
790 for (x = 0; x < sdp->sd_journals; x++) {
791 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
793 if (sdp->sd_args.ar_spectator) {
794 error = check_journal_clean(sdp, jd);
799 error = gfs2_recover_journal(jd, true);
801 fs_err(sdp, "error recovering journal %u: %d\n",
807 gfs2_others_may_mount(sdp);
808 } else if (!sdp->sd_args.ar_spectator) {
809 error = gfs2_recover_journal(sdp->sd_jdesc, true);
811 fs_err(sdp, "error recovering my journal: %d\n", error);
816 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
817 gfs2_glock_dq_uninit(&ji_gh);
823 if (!sdp->sd_args.ar_spectator)
824 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
826 if (!sdp->sd_args.ar_spectator)
827 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
829 gfs2_jindex_free(sdp);
831 gfs2_glock_dq_uninit(&ji_gh);
833 iput(sdp->sd_jindex);
837 static struct lock_class_key gfs2_quota_imutex_key;
839 static int init_inodes(struct gfs2_sbd *sdp, int undo)
842 struct inode *master = sdp->sd_master_dir->d_inode;
847 error = init_journal(sdp, undo);
851 /* Read in the master statfs inode */
852 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
853 if (IS_ERR(sdp->sd_statfs_inode)) {
854 error = PTR_ERR(sdp->sd_statfs_inode);
855 fs_err(sdp, "can't read in statfs inode: %d\n", error);
859 /* Read in the resource index inode */
860 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
861 if (IS_ERR(sdp->sd_rindex)) {
862 error = PTR_ERR(sdp->sd_rindex);
863 fs_err(sdp, "can't get resource index inode: %d\n", error);
866 sdp->sd_rindex_uptodate = 0;
868 /* Read in the quota inode */
869 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
870 if (IS_ERR(sdp->sd_quota_inode)) {
871 error = PTR_ERR(sdp->sd_quota_inode);
872 fs_err(sdp, "can't get quota file inode: %d\n", error);
876 * i_mutex on quota files is special. Since this inode is hidden system
877 * file, we are safe to define locking ourselves.
879 lockdep_set_class(&sdp->sd_quota_inode->i_mutex,
880 &gfs2_quota_imutex_key);
882 error = gfs2_rindex_update(sdp);
889 iput(sdp->sd_quota_inode);
891 gfs2_clear_rgrpd(sdp);
892 iput(sdp->sd_rindex);
894 iput(sdp->sd_statfs_inode);
896 init_journal(sdp, UNDO);
901 static int init_per_node(struct gfs2_sbd *sdp, int undo)
903 struct inode *pn = NULL;
906 struct gfs2_inode *ip;
907 struct inode *master = sdp->sd_master_dir->d_inode;
909 if (sdp->sd_args.ar_spectator)
915 pn = gfs2_lookup_simple(master, "per_node");
918 fs_err(sdp, "can't find per_node directory: %d\n", error);
922 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
923 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
924 if (IS_ERR(sdp->sd_sc_inode)) {
925 error = PTR_ERR(sdp->sd_sc_inode);
926 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
930 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
931 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
932 if (IS_ERR(sdp->sd_qc_inode)) {
933 error = PTR_ERR(sdp->sd_qc_inode);
934 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
941 ip = GFS2_I(sdp->sd_sc_inode);
942 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
945 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
949 ip = GFS2_I(sdp->sd_qc_inode);
950 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
953 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
960 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
962 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
964 iput(sdp->sd_qc_inode);
966 iput(sdp->sd_sc_inode);
973 static const match_table_t nolock_tokens = {
974 { Opt_jid, "jid=%d\n", },
978 static const struct lm_lockops nolock_ops = {
979 .lm_proto_name = "lock_nolock",
980 .lm_put_lock = gfs2_glock_free,
981 .lm_tokens = &nolock_tokens,
985 * gfs2_lm_mount - mount a locking protocol
986 * @sdp: the filesystem
987 * @args: mount arguments
988 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
993 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
995 const struct lm_lockops *lm;
996 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
997 struct gfs2_args *args = &sdp->sd_args;
998 const char *proto = sdp->sd_proto_name;
999 const char *table = sdp->sd_table_name;
1003 if (!strcmp("lock_nolock", proto)) {
1005 sdp->sd_args.ar_localflocks = 1;
1006 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1007 } else if (!strcmp("lock_dlm", proto)) {
1011 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1015 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1020 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1021 substring_t tmp[MAX_OPT_ARGS];
1027 token = match_token(o, *lm->lm_tokens, tmp);
1030 ret = match_int(&tmp[0], &option);
1031 if (ret || option < 0)
1032 goto hostdata_error;
1033 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1034 ls->ls_jid = option;
1038 /* Obsolete, but left for backward compat purposes */
1041 ret = match_int(&tmp[0], &option);
1042 if (ret || (option != 0 && option != 1))
1043 goto hostdata_error;
1044 ls->ls_first = option;
1049 fs_info(sdp, "unknown hostdata (%s)\n", o);
1054 if (lm->lm_mount == NULL) {
1055 fs_info(sdp, "Now mounting FS...\n");
1056 complete_all(&sdp->sd_locking_init);
1059 ret = lm->lm_mount(sdp, table);
1061 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1062 complete_all(&sdp->sd_locking_init);
1066 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1068 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1069 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1071 lm->lm_unmount(sdp);
1074 static int gfs2_journalid_wait(void *word)
1076 if (signal_pending(current))
1082 static int wait_on_journal(struct gfs2_sbd *sdp)
1084 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1087 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
1090 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1092 struct super_block *sb = sdp->sd_vfs;
1095 char *envp[] = { ro, spectator, NULL };
1096 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1097 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1098 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1102 * fill_super - Read in superblock
1103 * @sb: The VFS superblock
1104 * @data: Mount options
1105 * @silent: Don't complain if it's not a GFS2 filesystem
1110 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1112 struct gfs2_sbd *sdp;
1113 struct gfs2_holder mount_gh;
1118 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1121 sdp->sd_args = *args;
1123 if (sdp->sd_args.ar_spectator) {
1124 sb->s_flags |= MS_RDONLY;
1125 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1127 if (sdp->sd_args.ar_posix_acl)
1128 sb->s_flags |= MS_POSIXACL;
1129 if (sdp->sd_args.ar_nobarrier)
1130 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1132 sb->s_flags |= MS_NOSEC;
1133 sb->s_magic = GFS2_MAGIC;
1134 sb->s_op = &gfs2_super_ops;
1135 sb->s_d_op = &gfs2_dops;
1136 sb->s_export_op = &gfs2_export_ops;
1137 sb->s_xattr = gfs2_xattr_handlers;
1138 sb->s_qcop = &gfs2_quotactl_ops;
1139 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1140 sb->s_time_gran = 1;
1141 sb->s_maxbytes = MAX_LFS_FILESIZE;
1143 /* Set up the buffer cache and fill in some fake block size values
1144 to allow us to read-in the on-disk superblock. */
1145 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1146 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1147 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1148 GFS2_BASIC_BLOCK_SHIFT;
1149 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1151 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1152 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1153 if (sdp->sd_args.ar_statfs_quantum) {
1154 sdp->sd_tune.gt_statfs_slow = 0;
1155 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1157 sdp->sd_tune.gt_statfs_slow = 1;
1158 sdp->sd_tune.gt_statfs_quantum = 30;
1161 error = init_names(sdp, silent);
1163 /* In this case, we haven't initialized sysfs, so we have to
1164 manually free the sdp. */
1165 free_percpu(sdp->sd_lkstats);
1167 sb->s_fs_info = NULL;
1171 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name);
1173 error = gfs2_sys_fs_add(sdp);
1175 * If we hit an error here, gfs2_sys_fs_add will have called function
1176 * kobject_put which causes the sysfs usage count to go to zero, which
1177 * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1178 * Subsequent error paths here will call gfs2_sys_fs_del, which also
1179 * kobject_put to free sdp.
1184 gfs2_create_debugfs_file(sdp);
1186 error = gfs2_lm_mount(sdp, silent);
1190 error = init_locking(sdp, &mount_gh, DO);
1194 error = init_sb(sdp, silent);
1198 error = wait_on_journal(sdp);
1203 * If user space has failed to join the cluster or some similar
1204 * failure has occurred, then the journal id will contain a
1205 * negative (error) number. This will then be returned to the
1206 * caller (of the mount syscall). We do this even for spectator
1207 * mounts (which just write a jid of 0 to indicate "ok" even though
1208 * the jid is unused in the spectator case)
1210 if (sdp->sd_lockstruct.ls_jid < 0) {
1211 error = sdp->sd_lockstruct.ls_jid;
1212 sdp->sd_lockstruct.ls_jid = 0;
1216 if (sdp->sd_args.ar_spectator)
1217 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s",
1218 sdp->sd_table_name);
1220 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u",
1221 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1223 error = init_inodes(sdp, DO);
1227 error = init_per_node(sdp, DO);
1231 error = gfs2_statfs_init(sdp);
1233 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1237 if (!(sb->s_flags & MS_RDONLY)) {
1238 error = gfs2_make_fs_rw(sdp);
1240 fs_err(sdp, "can't make FS RW: %d\n", error);
1245 gfs2_glock_dq_uninit(&mount_gh);
1246 gfs2_online_uevent(sdp);
1250 init_per_node(sdp, UNDO);
1252 init_inodes(sdp, UNDO);
1254 if (sdp->sd_root_dir)
1255 dput(sdp->sd_root_dir);
1256 if (sdp->sd_master_dir)
1257 dput(sdp->sd_master_dir);
1262 init_locking(sdp, &mount_gh, UNDO);
1264 gfs2_gl_hash_clear(sdp);
1265 gfs2_lm_unmount(sdp);
1267 gfs2_delete_debugfs_file(sdp);
1268 free_percpu(sdp->sd_lkstats);
1269 /* gfs2_sys_fs_del must be the last thing we do, since it causes
1270 * sysfs to call function gfs2_sbd_release, which frees sdp. */
1271 gfs2_sys_fs_del(sdp);
1272 sb->s_fs_info = NULL;
1276 static int set_gfs2_super(struct super_block *s, void *data)
1279 s->s_dev = s->s_bdev->bd_dev;
1282 * We set the bdi here to the queue backing, file systems can
1283 * overwrite this in ->fill_super()
1285 s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1289 static int test_gfs2_super(struct super_block *s, void *ptr)
1291 struct block_device *bdev = ptr;
1292 return (bdev == s->s_bdev);
1296 * gfs2_mount - Get the GFS2 superblock
1297 * @fs_type: The GFS2 filesystem type
1298 * @flags: Mount flags
1299 * @dev_name: The name of the device
1300 * @data: The mount arguments
1302 * Q. Why not use get_sb_bdev() ?
1303 * A. We need to select one of two root directories to mount, independent
1304 * of whether this is the initial, or subsequent, mount of this sb
1306 * Returns: 0 or -ve on error
1309 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
1310 const char *dev_name, void *data)
1312 struct block_device *bdev;
1313 struct super_block *s;
1314 fmode_t mode = FMODE_READ | FMODE_EXCL;
1316 struct gfs2_args args;
1317 struct gfs2_sbd *sdp;
1319 if (!(flags & MS_RDONLY))
1320 mode |= FMODE_WRITE;
1322 bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1324 return ERR_CAST(bdev);
1327 * once the super is inserted into the list by sget, s_umount
1328 * will protect the lockfs code from trying to start a snapshot
1329 * while we are mounting
1331 mutex_lock(&bdev->bd_fsfreeze_mutex);
1332 if (bdev->bd_fsfreeze_count > 0) {
1333 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1337 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev);
1338 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1345 * s_umount nests inside bd_mutex during
1346 * __invalidate_device(). blkdev_put() acquires
1347 * bd_mutex and can't be called under s_umount. Drop
1348 * s_umount temporarily. This is safe as we're
1349 * holding an active reference.
1351 up_write(&s->s_umount);
1352 blkdev_put(bdev, mode);
1353 down_write(&s->s_umount);
1356 memset(&args, 0, sizeof(args));
1357 args.ar_quota = GFS2_QUOTA_DEFAULT;
1358 args.ar_data = GFS2_DATA_DEFAULT;
1359 args.ar_commit = 30;
1360 args.ar_statfs_quantum = 30;
1361 args.ar_quota_quantum = 60;
1362 args.ar_errors = GFS2_ERRORS_DEFAULT;
1364 error = gfs2_mount_args(&args, data);
1366 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1372 if ((flags ^ s->s_flags) & MS_RDONLY)
1375 char b[BDEVNAME_SIZE];
1378 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1379 sb_set_blocksize(s, block_size(bdev));
1380 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1383 s->s_flags |= MS_ACTIVE;
1389 return dget(sdp->sd_master_dir);
1391 return dget(sdp->sd_root_dir);
1394 deactivate_locked_super(s);
1395 return ERR_PTR(error);
1397 blkdev_put(bdev, mode);
1398 return ERR_PTR(error);
1401 static int set_meta_super(struct super_block *s, void *ptr)
1406 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
1407 int flags, const char *dev_name, void *data)
1409 struct super_block *s;
1410 struct gfs2_sbd *sdp;
1414 error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1416 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1418 return ERR_PTR(error);
1420 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
1421 path.dentry->d_inode->i_sb->s_bdev);
1424 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1427 if ((flags ^ s->s_flags) & MS_RDONLY) {
1428 deactivate_locked_super(s);
1429 return ERR_PTR(-EBUSY);
1432 return dget(sdp->sd_master_dir);
1435 static void gfs2_kill_sb(struct super_block *sb)
1437 struct gfs2_sbd *sdp = sb->s_fs_info;
1440 kill_block_super(sb);
1444 gfs2_meta_syncfs(sdp);
1445 dput(sdp->sd_root_dir);
1446 dput(sdp->sd_master_dir);
1447 sdp->sd_root_dir = NULL;
1448 sdp->sd_master_dir = NULL;
1449 shrink_dcache_sb(sb);
1450 gfs2_delete_debugfs_file(sdp);
1451 free_percpu(sdp->sd_lkstats);
1452 kill_block_super(sb);
1455 struct file_system_type gfs2_fs_type = {
1457 .fs_flags = FS_REQUIRES_DEV,
1458 .mount = gfs2_mount,
1459 .kill_sb = gfs2_kill_sb,
1460 .owner = THIS_MODULE,
1462 MODULE_ALIAS_FS("gfs2");
1464 struct file_system_type gfs2meta_fs_type = {
1466 .fs_flags = FS_REQUIRES_DEV,
1467 .mount = gfs2_mount_meta,
1468 .owner = THIS_MODULE,
1470 MODULE_ALIAS_FS("gfs2meta");