2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 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 <asm/semaphore.h>
20 #include "lm_interface.h"
39 * gfs2_tune_init - Fill a gfs2_tune structure with default values
44 void gfs2_tune_init(struct gfs2_tune *gt)
46 spin_lock_init(>->gt_spin);
49 gt->gt_ilimit_tries = 3;
50 gt->gt_ilimit_min = 1;
51 gt->gt_demote_secs = 300;
52 gt->gt_incore_log_blocks = 1024;
53 gt->gt_log_flush_secs = 60;
54 gt->gt_jindex_refresh_secs = 60;
55 gt->gt_scand_secs = 15;
56 gt->gt_recoverd_secs = 60;
58 gt->gt_quotad_secs = 5;
59 gt->gt_inoded_secs = 15;
60 gt->gt_quota_simul_sync = 64;
61 gt->gt_quota_warn_period = 10;
62 gt->gt_quota_scale_num = 1;
63 gt->gt_quota_scale_den = 1;
64 gt->gt_quota_cache_secs = 300;
65 gt->gt_quota_quantum = 60;
66 gt->gt_atime_quantum = 3600;
67 gt->gt_new_files_jdata = 0;
68 gt->gt_new_files_directio = 0;
69 gt->gt_max_atomic_write = 4 << 20;
70 gt->gt_max_readahead = 1 << 18;
71 gt->gt_lockdump_size = 131072;
72 gt->gt_stall_secs = 600;
73 gt->gt_complain_secs = 10;
74 gt->gt_reclaim_limit = 5000;
75 gt->gt_entries_per_readdir = 32;
76 gt->gt_prefetch_secs = 10;
77 gt->gt_greedy_default = HZ / 10;
78 gt->gt_greedy_quantum = HZ / 40;
79 gt->gt_greedy_max = HZ / 4;
80 gt->gt_statfs_quantum = 30;
81 gt->gt_statfs_slow = 0;
85 * gfs2_check_sb - Check superblock
86 * @sdp: the filesystem
88 * @silent: Don't print a message if the check fails
90 * Checks the version code of the FS is one that we understand how to
91 * read and that the sizes of the various on-disk structures have not
95 int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb *sb, int silent)
99 if (sb->sb_header.mh_magic != GFS2_MAGIC ||
100 sb->sb_header.mh_type != GFS2_METATYPE_SB) {
102 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
106 /* If format numbers match exactly, we're done. */
108 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
109 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
112 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
113 for (x = 0; gfs2_old_fs_formats[x]; x++)
114 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
117 if (!gfs2_old_fs_formats[x]) {
119 "GFS2: code version (%u, %u) is incompatible "
120 "with ondisk format (%u, %u)\n",
121 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
122 sb->sb_fs_format, sb->sb_multihost_format);
124 "GFS2: I don't know how to upgrade this FS\n");
129 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
130 for (x = 0; gfs2_old_multihost_formats[x]; x++)
131 if (gfs2_old_multihost_formats[x] ==
132 sb->sb_multihost_format)
135 if (!gfs2_old_multihost_formats[x]) {
137 "GFS2: code version (%u, %u) is incompatible "
138 "with ondisk format (%u, %u)\n",
139 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
140 sb->sb_fs_format, sb->sb_multihost_format);
142 "GFS2: I don't know how to upgrade this FS\n");
147 if (!sdp->sd_args.ar_upgrade) {
149 "GFS2: code version (%u, %u) is incompatible "
150 "with ondisk format (%u, %u)\n",
151 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
152 sb->sb_fs_format, sb->sb_multihost_format);
154 "GFS2: Use the \"upgrade\" mount option to upgrade "
156 printk(KERN_INFO "GFS2: See the manual for more details\n");
164 * gfs2_read_sb - Read super block
165 * @sdp: The GFS2 superblock
166 * @gl: the glock for the superblock (assumed to be held)
167 * @silent: Don't print message if mount fails
171 int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
173 struct buffer_head *bh;
174 uint32_t hash_blocks, ind_blocks, leaf_blocks;
179 error = gfs2_meta_read(gl, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift,
180 DIO_FORCE | DIO_START | DIO_WAIT, &bh);
183 fs_err(sdp, "can't read superblock\n");
187 gfs2_assert(sdp, sizeof(struct gfs2_sb) <= bh->b_size);
188 gfs2_sb_in(&sdp->sd_sb, bh->b_data);
191 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
195 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
196 GFS2_BASIC_BLOCK_SHIFT;
197 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
198 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
199 sizeof(struct gfs2_dinode)) / sizeof(uint64_t);
200 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
201 sizeof(struct gfs2_meta_header)) / sizeof(uint64_t);
202 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
203 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
204 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
205 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(uint64_t);
206 sdp->sd_ut_per_block = (sdp->sd_sb.sb_bsize -
207 sizeof(struct gfs2_meta_header)) /
208 sizeof(struct gfs2_unlinked_tag);
209 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
210 sizeof(struct gfs2_meta_header)) /
211 sizeof(struct gfs2_quota_change);
213 /* Compute maximum reservation required to add a entry to a directory */
215 hash_blocks = DIV_ROUND_UP(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH),
219 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
220 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
221 ind_blocks += tmp_blocks;
224 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
226 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
228 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
229 sizeof(struct gfs2_dinode);
230 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
235 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
237 m = do_div(d, sdp->sd_inptrs);
239 if (d != sdp->sd_heightsize[x - 1] || m)
241 sdp->sd_heightsize[x] = space;
243 sdp->sd_max_height = x;
244 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
246 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
247 sizeof(struct gfs2_dinode);
248 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
253 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
255 m = do_div(d, sdp->sd_inptrs);
257 if (d != sdp->sd_jheightsize[x - 1] || m)
259 sdp->sd_jheightsize[x] = space;
261 sdp->sd_max_jheight = x;
262 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
267 int gfs2_do_upgrade(struct gfs2_sbd *sdp, struct gfs2_glock *sb_gl)
273 * gfs2_jindex_hold - Grab a lock on the jindex
274 * @sdp: The GFS2 superblock
275 * @ji_gh: the holder for the jindex glock
277 * This is very similar to the gfs2_rindex_hold() function, except that
278 * in general we hold the jindex lock for longer periods of time and
279 * we grab it far less frequently (in general) then the rgrp lock.
284 int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
286 struct gfs2_inode *dip = sdp->sd_jindex->u.generic_ip;
289 struct gfs2_jdesc *jd;
294 mutex_lock(&sdp->sd_jindex_mutex);
297 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED,
298 GL_LOCAL_EXCL, ji_gh);
302 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
303 name.hash = gfs2_disk_hash(name.name, name.len);
305 error = gfs2_dir_search(sdp->sd_jindex,
307 if (error == -ENOENT) {
312 gfs2_glock_dq_uninit(ji_gh);
318 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
322 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
323 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
327 error = PTR_ERR(jd->jd_inode);
332 spin_lock(&sdp->sd_jindex_spin);
333 jd->jd_jid = sdp->sd_journals++;
334 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
335 spin_unlock(&sdp->sd_jindex_spin);
338 mutex_unlock(&sdp->sd_jindex_mutex);
344 * gfs2_jindex_free - Clear all the journal index information
345 * @sdp: The GFS2 superblock
349 void gfs2_jindex_free(struct gfs2_sbd *sdp)
351 struct list_head list;
352 struct gfs2_jdesc *jd;
354 spin_lock(&sdp->sd_jindex_spin);
355 list_add(&list, &sdp->sd_jindex_list);
356 list_del_init(&sdp->sd_jindex_list);
357 sdp->sd_journals = 0;
358 spin_unlock(&sdp->sd_jindex_spin);
360 while (!list_empty(&list)) {
361 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
362 list_del(&jd->jd_list);
368 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
370 struct gfs2_jdesc *jd;
373 list_for_each_entry(jd, head, jd_list) {
374 if (jd->jd_jid == jid) {
386 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
388 struct gfs2_jdesc *jd;
390 spin_lock(&sdp->sd_jindex_spin);
391 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
392 spin_unlock(&sdp->sd_jindex_spin);
397 void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
399 struct gfs2_jdesc *jd;
401 spin_lock(&sdp->sd_jindex_spin);
402 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
405 spin_unlock(&sdp->sd_jindex_spin);
408 struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
410 struct gfs2_jdesc *jd;
413 spin_lock(&sdp->sd_jindex_spin);
415 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
422 spin_unlock(&sdp->sd_jindex_spin);
430 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
432 struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
433 struct gfs2_sbd *sdp = ip->i_sbd;
437 if (ip->i_di.di_size < (8 << 20) ||
438 ip->i_di.di_size > (1 << 30) ||
439 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
440 gfs2_consist_inode(ip);
443 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
445 error = gfs2_write_alloc_required(ip,
449 gfs2_consist_inode(ip);
457 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
458 * @sdp: the filesystem
463 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
465 struct gfs2_inode *ip = sdp->sd_jdesc->jd_inode->u.generic_ip;
466 struct gfs2_glock *j_gl = ip->i_gl;
467 struct gfs2_holder t_gh;
468 struct gfs2_log_header head;
471 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
472 GL_LOCAL_EXCL | GL_NEVER_RECURSE, &t_gh);
476 gfs2_meta_cache_flush(ip);
477 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
479 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
483 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
489 /* Initialize some head of the log stuff */
490 sdp->sd_log_sequence = head.lh_sequence + 1;
491 gfs2_log_pointers_init(sdp, head.lh_blkno);
493 error = gfs2_unlinked_init(sdp);
496 error = gfs2_quota_init(sdp);
500 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
502 gfs2_glock_dq_uninit(&t_gh);
507 gfs2_unlinked_cleanup(sdp);
510 t_gh.gh_flags |= GL_NOCACHE;
511 gfs2_glock_dq_uninit(&t_gh);
517 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
518 * @sdp: the filesystem
523 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
525 struct gfs2_holder t_gh;
528 gfs2_unlinked_dealloc(sdp);
529 gfs2_quota_sync(sdp);
530 gfs2_statfs_sync(sdp);
532 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
533 GL_LOCAL_EXCL | GL_NEVER_RECURSE | GL_NOCACHE,
535 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
538 gfs2_meta_syncfs(sdp);
539 gfs2_log_shutdown(sdp);
541 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
544 gfs2_glock_dq_uninit(&t_gh);
546 gfs2_unlinked_cleanup(sdp);
547 gfs2_quota_cleanup(sdp);
552 int gfs2_statfs_init(struct gfs2_sbd *sdp)
554 struct gfs2_inode *m_ip = sdp->sd_statfs_inode->u.generic_ip;
555 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
556 struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip;
557 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
558 struct buffer_head *m_bh, *l_bh;
559 struct gfs2_holder gh;
562 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
567 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
571 if (sdp->sd_args.ar_spectator) {
572 spin_lock(&sdp->sd_statfs_spin);
573 gfs2_statfs_change_in(m_sc, m_bh->b_data +
574 sizeof(struct gfs2_dinode));
575 spin_unlock(&sdp->sd_statfs_spin);
577 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
581 spin_lock(&sdp->sd_statfs_spin);
582 gfs2_statfs_change_in(m_sc, m_bh->b_data +
583 sizeof(struct gfs2_dinode));
584 gfs2_statfs_change_in(l_sc, l_bh->b_data +
585 sizeof(struct gfs2_dinode));
586 spin_unlock(&sdp->sd_statfs_spin);
595 gfs2_glock_dq_uninit(&gh);
600 void gfs2_statfs_change(struct gfs2_sbd *sdp, int64_t total, int64_t free,
603 struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip;
604 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
605 struct buffer_head *l_bh;
608 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
612 mutex_lock(&sdp->sd_statfs_mutex);
613 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
614 mutex_unlock(&sdp->sd_statfs_mutex);
616 spin_lock(&sdp->sd_statfs_spin);
617 l_sc->sc_total += total;
618 l_sc->sc_free += free;
619 l_sc->sc_dinodes += dinodes;
620 gfs2_statfs_change_out(l_sc, l_bh->b_data +
621 sizeof(struct gfs2_dinode));
622 spin_unlock(&sdp->sd_statfs_spin);
627 int gfs2_statfs_sync(struct gfs2_sbd *sdp)
629 struct gfs2_inode *m_ip = sdp->sd_statfs_inode->u.generic_ip;
630 struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip;
631 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
632 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
633 struct gfs2_holder gh;
634 struct buffer_head *m_bh, *l_bh;
637 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
642 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
646 spin_lock(&sdp->sd_statfs_spin);
647 gfs2_statfs_change_in(m_sc, m_bh->b_data +
648 sizeof(struct gfs2_dinode));
649 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
650 spin_unlock(&sdp->sd_statfs_spin);
653 spin_unlock(&sdp->sd_statfs_spin);
655 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
659 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
663 mutex_lock(&sdp->sd_statfs_mutex);
664 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
665 mutex_unlock(&sdp->sd_statfs_mutex);
667 spin_lock(&sdp->sd_statfs_spin);
668 m_sc->sc_total += l_sc->sc_total;
669 m_sc->sc_free += l_sc->sc_free;
670 m_sc->sc_dinodes += l_sc->sc_dinodes;
671 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
672 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
673 0, sizeof(struct gfs2_statfs_change));
674 spin_unlock(&sdp->sd_statfs_spin);
676 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
677 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
688 gfs2_glock_dq_uninit(&gh);
694 * gfs2_statfs_i - Do a statfs
695 * @sdp: the filesystem
696 * @sg: the sg structure
701 int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
703 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
704 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
706 spin_lock(&sdp->sd_statfs_spin);
709 sc->sc_total += l_sc->sc_total;
710 sc->sc_free += l_sc->sc_free;
711 sc->sc_dinodes += l_sc->sc_dinodes;
713 spin_unlock(&sdp->sd_statfs_spin);
717 if (sc->sc_free > sc->sc_total)
718 sc->sc_free = sc->sc_total;
719 if (sc->sc_dinodes < 0)
726 * statfs_fill - fill in the sg for a given RG
728 * @sc: the sc structure
730 * Returns: 0 on success, -ESTALE if the LVB is invalid
733 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
734 struct gfs2_statfs_change *sc)
736 gfs2_rgrp_verify(rgd);
737 sc->sc_total += rgd->rd_ri.ri_data;
738 sc->sc_free += rgd->rd_rg.rg_free;
739 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
744 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
745 * @sdp: the filesystem
746 * @sc: the sc info that will be returned
748 * Any error (other than a signal) will cause this routine to fall back
749 * to the synchronous version.
751 * FIXME: This really shouldn't busy wait like this.
756 int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
758 struct gfs2_holder ri_gh;
759 struct gfs2_rgrpd *rgd_next;
760 struct gfs2_holder *gha, *gh;
761 unsigned int slots = 64;
766 memset(sc, 0, sizeof(struct gfs2_statfs_change));
767 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
771 error = gfs2_rindex_hold(sdp, &ri_gh);
775 rgd_next = gfs2_rgrpd_get_first(sdp);
780 for (x = 0; x < slots; x++) {
783 if (gh->gh_gl && gfs2_glock_poll(gh)) {
784 err = gfs2_glock_wait(gh);
786 gfs2_holder_uninit(gh);
790 error = statfs_slow_fill(
791 gh->gh_gl->gl_object, sc);
792 gfs2_glock_dq_uninit(gh);
798 else if (rgd_next && !error) {
799 error = gfs2_glock_nq_init(rgd_next->rd_gl,
803 rgd_next = gfs2_rgrpd_get_next(rgd_next);
807 if (signal_pending(current))
808 error = -ERESTARTSYS;
817 gfs2_glock_dq_uninit(&ri_gh);
826 struct list_head list;
827 struct gfs2_holder gh;
831 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
833 * @sdp: the file system
834 * @state: the state to put the transaction lock into
835 * @t_gh: the hold on the transaction lock
840 int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, struct gfs2_holder *t_gh)
842 struct gfs2_inode *ip;
843 struct gfs2_holder ji_gh;
844 struct gfs2_jdesc *jd;
847 struct gfs2_log_header lh;
850 error = gfs2_jindex_hold(sdp, &ji_gh);
854 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
855 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
860 ip = jd->jd_inode->u.generic_ip;
861 error = gfs2_glock_nq_init(ip->i_gl,
868 list_add(&lfcc->list, &list);
871 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
872 LM_FLAG_PRIORITY | GL_NEVER_RECURSE | GL_NOCACHE,
875 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
876 error = gfs2_jdesc_check(jd);
879 error = gfs2_find_jhead(jd, &lh);
882 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
889 gfs2_glock_dq_uninit(t_gh);
892 while (!list_empty(&list)) {
893 lfcc = list_entry(list.next, struct lfcc, list);
894 list_del(&lfcc->list);
895 gfs2_glock_dq_uninit(&lfcc->gh);
898 gfs2_glock_dq_uninit(&ji_gh);
904 * gfs2_freeze_fs - freezes the file system
905 * @sdp: the file system
907 * This function flushes data and meta data for all machines by
908 * aquiring the transaction log exclusively. All journals are
909 * ensured to be in a clean state as well.
914 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
918 mutex_lock(&sdp->sd_freeze_lock);
920 if (!sdp->sd_freeze_count++) {
921 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
923 sdp->sd_freeze_count--;
926 mutex_unlock(&sdp->sd_freeze_lock);
932 * gfs2_unfreeze_fs - unfreezes the file system
933 * @sdp: the file system
935 * This function allows the file system to proceed by unlocking
936 * the exclusively held transaction lock. Other GFS2 nodes are
937 * now free to acquire the lock shared and go on with their lives.
941 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
943 mutex_lock(&sdp->sd_freeze_lock);
945 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
946 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
948 mutex_unlock(&sdp->sd_freeze_lock);