2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 v.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/crc32.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/bio.h>
20 #include "lm_interface.h"
38 * gfs2_tune_init - Fill a gfs2_tune structure with default values
43 void gfs2_tune_init(struct gfs2_tune *gt)
45 spin_lock_init(>->gt_spin);
48 gt->gt_ilimit_tries = 3;
49 gt->gt_ilimit_min = 1;
50 gt->gt_demote_secs = 300;
51 gt->gt_incore_log_blocks = 1024;
52 gt->gt_log_flush_secs = 60;
53 gt->gt_jindex_refresh_secs = 60;
54 gt->gt_scand_secs = 15;
55 gt->gt_recoverd_secs = 60;
57 gt->gt_quotad_secs = 5;
58 gt->gt_quota_simul_sync = 64;
59 gt->gt_quota_warn_period = 10;
60 gt->gt_quota_scale_num = 1;
61 gt->gt_quota_scale_den = 1;
62 gt->gt_quota_cache_secs = 300;
63 gt->gt_quota_quantum = 60;
64 gt->gt_atime_quantum = 3600;
65 gt->gt_new_files_jdata = 0;
66 gt->gt_new_files_directio = 0;
67 gt->gt_max_atomic_write = 4 << 20;
68 gt->gt_max_readahead = 1 << 18;
69 gt->gt_lockdump_size = 131072;
70 gt->gt_stall_secs = 600;
71 gt->gt_complain_secs = 10;
72 gt->gt_reclaim_limit = 5000;
73 gt->gt_entries_per_readdir = 32;
74 gt->gt_prefetch_secs = 10;
75 gt->gt_greedy_default = HZ / 10;
76 gt->gt_greedy_quantum = HZ / 40;
77 gt->gt_greedy_max = HZ / 4;
78 gt->gt_statfs_quantum = 30;
79 gt->gt_statfs_slow = 0;
83 * gfs2_check_sb - Check superblock
84 * @sdp: the filesystem
86 * @silent: Don't print a message if the check fails
88 * Checks the version code of the FS is one that we understand how to
89 * read and that the sizes of the various on-disk structures have not
93 int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb *sb, int silent)
97 if (sb->sb_header.mh_magic != GFS2_MAGIC ||
98 sb->sb_header.mh_type != GFS2_METATYPE_SB) {
100 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
104 /* If format numbers match exactly, we're done. */
106 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
107 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
110 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
111 for (x = 0; gfs2_old_fs_formats[x]; x++)
112 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
115 if (!gfs2_old_fs_formats[x]) {
117 "GFS2: code version (%u, %u) is incompatible "
118 "with ondisk format (%u, %u)\n",
119 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
120 sb->sb_fs_format, sb->sb_multihost_format);
122 "GFS2: I don't know how to upgrade this FS\n");
127 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
128 for (x = 0; gfs2_old_multihost_formats[x]; x++)
129 if (gfs2_old_multihost_formats[x] ==
130 sb->sb_multihost_format)
133 if (!gfs2_old_multihost_formats[x]) {
135 "GFS2: code version (%u, %u) is incompatible "
136 "with ondisk format (%u, %u)\n",
137 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
138 sb->sb_fs_format, sb->sb_multihost_format);
140 "GFS2: I don't know how to upgrade this FS\n");
145 if (!sdp->sd_args.ar_upgrade) {
147 "GFS2: code version (%u, %u) is incompatible "
148 "with ondisk format (%u, %u)\n",
149 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
150 sb->sb_fs_format, sb->sb_multihost_format);
152 "GFS2: Use the \"upgrade\" mount option to upgrade "
154 printk(KERN_INFO "GFS2: See the manual for more details\n");
162 static int end_bio_io_page(struct bio *bio, unsigned int bytes_done, int error)
164 struct page *page = bio->bi_private;
169 SetPageUptodate(page);
174 static struct page *gfs2_read_super(struct super_block *sb, sector_t sector)
179 page = alloc_page(GFP_KERNEL);
183 ClearPageUptodate(page);
184 ClearPageDirty(page);
187 bio = bio_alloc(GFP_KERNEL, 1);
188 if (unlikely(!bio)) {
193 bio->bi_sector = sector;
194 bio->bi_bdev = sb->s_bdev;
195 bio_add_page(bio, page, PAGE_SIZE, 0);
197 bio->bi_end_io = end_bio_io_page;
198 bio->bi_private = page;
199 submit_bio(READ | BIO_RW_SYNC, bio);
200 wait_on_page_locked(page);
202 if (!PageUptodate(page)) {
210 * gfs2_read_sb - Read super block
211 * @sdp: The GFS2 superblock
212 * @gl: the glock for the superblock (assumed to be held)
213 * @silent: Don't print message if mount fails
217 int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
219 uint32_t hash_blocks, ind_blocks, leaf_blocks;
226 page = gfs2_read_super(sdp->sd_vfs, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
229 fs_err(sdp, "can't read superblock\n");
233 gfs2_sb_in(&sdp->sd_sb, sb);
237 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
241 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
242 GFS2_BASIC_BLOCK_SHIFT;
243 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
244 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
245 sizeof(struct gfs2_dinode)) / sizeof(uint64_t);
246 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
247 sizeof(struct gfs2_meta_header)) / sizeof(uint64_t);
248 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
249 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
250 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
251 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(uint64_t);
252 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
253 sizeof(struct gfs2_meta_header)) /
254 sizeof(struct gfs2_quota_change);
256 /* Compute maximum reservation required to add a entry to a directory */
258 hash_blocks = DIV_ROUND_UP(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH),
262 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
263 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
264 ind_blocks += tmp_blocks;
267 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
269 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
271 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
272 sizeof(struct gfs2_dinode);
273 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
278 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
280 m = do_div(d, sdp->sd_inptrs);
282 if (d != sdp->sd_heightsize[x - 1] || m)
284 sdp->sd_heightsize[x] = space;
286 sdp->sd_max_height = x;
287 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
289 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
290 sizeof(struct gfs2_dinode);
291 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
296 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
298 m = do_div(d, sdp->sd_inptrs);
300 if (d != sdp->sd_jheightsize[x - 1] || m)
302 sdp->sd_jheightsize[x] = space;
304 sdp->sd_max_jheight = x;
305 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
311 * gfs2_jindex_hold - Grab a lock on the jindex
312 * @sdp: The GFS2 superblock
313 * @ji_gh: the holder for the jindex glock
315 * This is very similar to the gfs2_rindex_hold() function, except that
316 * in general we hold the jindex lock for longer periods of time and
317 * we grab it far less frequently (in general) then the rgrp lock.
322 int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
324 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
327 struct gfs2_jdesc *jd;
332 mutex_lock(&sdp->sd_jindex_mutex);
335 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED,
336 GL_LOCAL_EXCL, ji_gh);
340 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
341 name.hash = gfs2_disk_hash(name.name, name.len);
343 error = gfs2_dir_search(sdp->sd_jindex, &name, NULL, NULL);
344 if (error == -ENOENT) {
349 gfs2_glock_dq_uninit(ji_gh);
355 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
359 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
360 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
364 error = PTR_ERR(jd->jd_inode);
369 spin_lock(&sdp->sd_jindex_spin);
370 jd->jd_jid = sdp->sd_journals++;
371 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
372 spin_unlock(&sdp->sd_jindex_spin);
375 mutex_unlock(&sdp->sd_jindex_mutex);
381 * gfs2_jindex_free - Clear all the journal index information
382 * @sdp: The GFS2 superblock
386 void gfs2_jindex_free(struct gfs2_sbd *sdp)
388 struct list_head list;
389 struct gfs2_jdesc *jd;
391 spin_lock(&sdp->sd_jindex_spin);
392 list_add(&list, &sdp->sd_jindex_list);
393 list_del_init(&sdp->sd_jindex_list);
394 sdp->sd_journals = 0;
395 spin_unlock(&sdp->sd_jindex_spin);
397 while (!list_empty(&list)) {
398 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
399 list_del(&jd->jd_list);
405 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
407 struct gfs2_jdesc *jd;
410 list_for_each_entry(jd, head, jd_list) {
411 if (jd->jd_jid == jid) {
423 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
425 struct gfs2_jdesc *jd;
427 spin_lock(&sdp->sd_jindex_spin);
428 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
429 spin_unlock(&sdp->sd_jindex_spin);
434 void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
436 struct gfs2_jdesc *jd;
438 spin_lock(&sdp->sd_jindex_spin);
439 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
442 spin_unlock(&sdp->sd_jindex_spin);
445 struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
447 struct gfs2_jdesc *jd;
450 spin_lock(&sdp->sd_jindex_spin);
452 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
459 spin_unlock(&sdp->sd_jindex_spin);
467 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
469 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
470 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
474 if (ip->i_di.di_size < (8 << 20) || ip->i_di.di_size > (1 << 30) ||
475 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
476 gfs2_consist_inode(ip);
479 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
481 error = gfs2_write_alloc_required(ip, 0, ip->i_di.di_size, &ar);
483 gfs2_consist_inode(ip);
491 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
492 * @sdp: the filesystem
497 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
499 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
500 struct gfs2_glock *j_gl = ip->i_gl;
501 struct gfs2_holder t_gh;
502 struct gfs2_log_header head;
505 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
506 GL_LOCAL_EXCL, &t_gh);
510 gfs2_meta_cache_flush(ip);
511 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
513 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
517 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
523 /* Initialize some head of the log stuff */
524 sdp->sd_log_sequence = head.lh_sequence + 1;
525 gfs2_log_pointers_init(sdp, head.lh_blkno);
527 error = gfs2_quota_init(sdp);
531 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
533 gfs2_glock_dq_uninit(&t_gh);
540 t_gh.gh_flags |= GL_NOCACHE;
541 gfs2_glock_dq_uninit(&t_gh);
547 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
548 * @sdp: the filesystem
553 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
555 struct gfs2_holder t_gh;
558 gfs2_quota_sync(sdp);
559 gfs2_statfs_sync(sdp);
561 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
562 GL_LOCAL_EXCL | GL_NOCACHE,
564 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
567 gfs2_meta_syncfs(sdp);
568 gfs2_log_shutdown(sdp);
570 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
573 gfs2_glock_dq_uninit(&t_gh);
575 gfs2_quota_cleanup(sdp);
580 int gfs2_statfs_init(struct gfs2_sbd *sdp)
582 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
583 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
584 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
585 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
586 struct buffer_head *m_bh, *l_bh;
587 struct gfs2_holder gh;
590 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
595 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
599 if (sdp->sd_args.ar_spectator) {
600 spin_lock(&sdp->sd_statfs_spin);
601 gfs2_statfs_change_in(m_sc, m_bh->b_data +
602 sizeof(struct gfs2_dinode));
603 spin_unlock(&sdp->sd_statfs_spin);
605 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
609 spin_lock(&sdp->sd_statfs_spin);
610 gfs2_statfs_change_in(m_sc, m_bh->b_data +
611 sizeof(struct gfs2_dinode));
612 gfs2_statfs_change_in(l_sc, l_bh->b_data +
613 sizeof(struct gfs2_dinode));
614 spin_unlock(&sdp->sd_statfs_spin);
623 gfs2_glock_dq_uninit(&gh);
628 void gfs2_statfs_change(struct gfs2_sbd *sdp, int64_t total, int64_t free,
631 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
632 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
633 struct buffer_head *l_bh;
636 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
640 mutex_lock(&sdp->sd_statfs_mutex);
641 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
642 mutex_unlock(&sdp->sd_statfs_mutex);
644 spin_lock(&sdp->sd_statfs_spin);
645 l_sc->sc_total += total;
646 l_sc->sc_free += free;
647 l_sc->sc_dinodes += dinodes;
648 gfs2_statfs_change_out(l_sc, l_bh->b_data +
649 sizeof(struct gfs2_dinode));
650 spin_unlock(&sdp->sd_statfs_spin);
655 int gfs2_statfs_sync(struct gfs2_sbd *sdp)
657 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
658 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
659 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
660 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
661 struct gfs2_holder gh;
662 struct buffer_head *m_bh, *l_bh;
665 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
670 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
674 spin_lock(&sdp->sd_statfs_spin);
675 gfs2_statfs_change_in(m_sc, m_bh->b_data +
676 sizeof(struct gfs2_dinode));
677 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
678 spin_unlock(&sdp->sd_statfs_spin);
681 spin_unlock(&sdp->sd_statfs_spin);
683 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
687 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
691 mutex_lock(&sdp->sd_statfs_mutex);
692 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
693 mutex_unlock(&sdp->sd_statfs_mutex);
695 spin_lock(&sdp->sd_statfs_spin);
696 m_sc->sc_total += l_sc->sc_total;
697 m_sc->sc_free += l_sc->sc_free;
698 m_sc->sc_dinodes += l_sc->sc_dinodes;
699 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
700 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
701 0, sizeof(struct gfs2_statfs_change));
702 spin_unlock(&sdp->sd_statfs_spin);
704 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
705 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
716 gfs2_glock_dq_uninit(&gh);
722 * gfs2_statfs_i - Do a statfs
723 * @sdp: the filesystem
724 * @sg: the sg structure
729 int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
731 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
732 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
734 spin_lock(&sdp->sd_statfs_spin);
737 sc->sc_total += l_sc->sc_total;
738 sc->sc_free += l_sc->sc_free;
739 sc->sc_dinodes += l_sc->sc_dinodes;
741 spin_unlock(&sdp->sd_statfs_spin);
745 if (sc->sc_free > sc->sc_total)
746 sc->sc_free = sc->sc_total;
747 if (sc->sc_dinodes < 0)
754 * statfs_fill - fill in the sg for a given RG
756 * @sc: the sc structure
758 * Returns: 0 on success, -ESTALE if the LVB is invalid
761 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
762 struct gfs2_statfs_change *sc)
764 gfs2_rgrp_verify(rgd);
765 sc->sc_total += rgd->rd_ri.ri_data;
766 sc->sc_free += rgd->rd_rg.rg_free;
767 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
772 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
773 * @sdp: the filesystem
774 * @sc: the sc info that will be returned
776 * Any error (other than a signal) will cause this routine to fall back
777 * to the synchronous version.
779 * FIXME: This really shouldn't busy wait like this.
784 int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
786 struct gfs2_holder ri_gh;
787 struct gfs2_rgrpd *rgd_next;
788 struct gfs2_holder *gha, *gh;
789 unsigned int slots = 64;
794 memset(sc, 0, sizeof(struct gfs2_statfs_change));
795 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
799 error = gfs2_rindex_hold(sdp, &ri_gh);
803 rgd_next = gfs2_rgrpd_get_first(sdp);
808 for (x = 0; x < slots; x++) {
811 if (gh->gh_gl && gfs2_glock_poll(gh)) {
812 err = gfs2_glock_wait(gh);
814 gfs2_holder_uninit(gh);
818 error = statfs_slow_fill(
819 gh->gh_gl->gl_object, sc);
820 gfs2_glock_dq_uninit(gh);
826 else if (rgd_next && !error) {
827 error = gfs2_glock_nq_init(rgd_next->rd_gl,
831 rgd_next = gfs2_rgrpd_get_next(rgd_next);
835 if (signal_pending(current))
836 error = -ERESTARTSYS;
845 gfs2_glock_dq_uninit(&ri_gh);
854 struct list_head list;
855 struct gfs2_holder gh;
859 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
861 * @sdp: the file system
862 * @state: the state to put the transaction lock into
863 * @t_gh: the hold on the transaction lock
868 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
869 struct gfs2_holder *t_gh)
871 struct gfs2_inode *ip;
872 struct gfs2_holder ji_gh;
873 struct gfs2_jdesc *jd;
876 struct gfs2_log_header lh;
879 error = gfs2_jindex_hold(sdp, &ji_gh);
883 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
884 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
889 ip = GFS2_I(jd->jd_inode);
890 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
895 list_add(&lfcc->list, &list);
898 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
899 LM_FLAG_PRIORITY | GL_NOCACHE,
902 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
903 error = gfs2_jdesc_check(jd);
906 error = gfs2_find_jhead(jd, &lh);
909 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
916 gfs2_glock_dq_uninit(t_gh);
919 while (!list_empty(&list)) {
920 lfcc = list_entry(list.next, struct lfcc, list);
921 list_del(&lfcc->list);
922 gfs2_glock_dq_uninit(&lfcc->gh);
925 gfs2_glock_dq_uninit(&ji_gh);
931 * gfs2_freeze_fs - freezes the file system
932 * @sdp: the file system
934 * This function flushes data and meta data for all machines by
935 * aquiring the transaction log exclusively. All journals are
936 * ensured to be in a clean state as well.
941 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
945 mutex_lock(&sdp->sd_freeze_lock);
947 if (!sdp->sd_freeze_count++) {
948 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
950 sdp->sd_freeze_count--;
953 mutex_unlock(&sdp->sd_freeze_lock);
959 * gfs2_unfreeze_fs - unfreezes the file system
960 * @sdp: the file system
962 * This function allows the file system to proceed by unlocking
963 * the exclusively held transaction lock. Other GFS2 nodes are
964 * now free to acquire the lock shared and go on with their lives.
968 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
970 mutex_lock(&sdp->sd_freeze_lock);
972 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
973 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
975 mutex_unlock(&sdp->sd_freeze_lock);