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 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/crc32.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/bio.h>
18 #include <linux/lm_interface.h>
36 static const u32 gfs2_old_fs_formats[] = {
40 static const u32 gfs2_old_multihost_formats[] = {
45 * gfs2_tune_init - Fill a gfs2_tune structure with default values
50 void gfs2_tune_init(struct gfs2_tune *gt)
52 spin_lock_init(>->gt_spin);
54 gt->gt_demote_secs = 300;
55 gt->gt_incore_log_blocks = 1024;
56 gt->gt_log_flush_secs = 60;
57 gt->gt_jindex_refresh_secs = 60;
58 gt->gt_recoverd_secs = 60;
60 gt->gt_quotad_secs = 5;
61 gt->gt_quota_simul_sync = 64;
62 gt->gt_quota_warn_period = 10;
63 gt->gt_quota_scale_num = 1;
64 gt->gt_quota_scale_den = 1;
65 gt->gt_quota_cache_secs = 300;
66 gt->gt_quota_quantum = 60;
67 gt->gt_atime_quantum = 3600;
68 gt->gt_new_files_jdata = 0;
69 gt->gt_new_files_directio = 0;
70 gt->gt_max_readahead = 1 << 18;
71 gt->gt_stall_secs = 600;
72 gt->gt_complain_secs = 10;
73 gt->gt_statfs_quantum = 30;
74 gt->gt_statfs_slow = 0;
78 * gfs2_check_sb - Check superblock
79 * @sdp: the filesystem
81 * @silent: Don't print a message if the check fails
83 * Checks the version code of the FS is one that we understand how to
84 * read and that the sizes of the various on-disk structures have not
88 int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
92 if (sb->sb_magic != GFS2_MAGIC ||
93 sb->sb_type != GFS2_METATYPE_SB) {
95 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
99 /* If format numbers match exactly, we're done. */
101 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
102 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
105 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
106 for (x = 0; gfs2_old_fs_formats[x]; x++)
107 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
110 if (!gfs2_old_fs_formats[x]) {
112 "GFS2: code version (%u, %u) is incompatible "
113 "with ondisk format (%u, %u)\n",
114 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
115 sb->sb_fs_format, sb->sb_multihost_format);
117 "GFS2: I don't know how to upgrade this FS\n");
122 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
123 for (x = 0; gfs2_old_multihost_formats[x]; x++)
124 if (gfs2_old_multihost_formats[x] ==
125 sb->sb_multihost_format)
128 if (!gfs2_old_multihost_formats[x]) {
130 "GFS2: code version (%u, %u) is incompatible "
131 "with ondisk format (%u, %u)\n",
132 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
133 sb->sb_fs_format, sb->sb_multihost_format);
135 "GFS2: I don't know how to upgrade this FS\n");
140 if (!sdp->sd_args.ar_upgrade) {
142 "GFS2: code version (%u, %u) is incompatible "
143 "with ondisk format (%u, %u)\n",
144 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
145 sb->sb_fs_format, sb->sb_multihost_format);
147 "GFS2: Use the \"upgrade\" mount option to upgrade "
149 printk(KERN_INFO "GFS2: See the manual for more details\n");
157 static void end_bio_io_page(struct bio *bio, int error)
159 struct page *page = bio->bi_private;
162 SetPageUptodate(page);
164 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
168 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
170 const struct gfs2_sb *str = buf;
172 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
173 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
174 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
175 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
176 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
177 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
178 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
179 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
180 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
181 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
182 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
184 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
185 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
189 * gfs2_read_super - Read the gfs2 super block from disk
190 * @sdp: The GFS2 super block
191 * @sector: The location of the super block
192 * @error: The error code to return
194 * This uses the bio functions to read the super block from disk
195 * because we want to be 100% sure that we never read cached data.
196 * A super block is read twice only during each GFS2 mount and is
197 * never written to by the filesystem. The first time its read no
198 * locks are held, and the only details which are looked at are those
199 * relating to the locking protocol. Once locking is up and working,
200 * the sb is read again under the lock to establish the location of
201 * the master directory (contains pointers to journals etc) and the
204 * Returns: 0 on success or error
207 int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
209 struct super_block *sb = sdp->sd_vfs;
214 page = alloc_page(GFP_KERNEL);
218 ClearPageUptodate(page);
219 ClearPageDirty(page);
222 bio = bio_alloc(GFP_KERNEL, 1);
223 if (unlikely(!bio)) {
228 bio->bi_sector = sector * (sb->s_blocksize >> 9);
229 bio->bi_bdev = sb->s_bdev;
230 bio_add_page(bio, page, PAGE_SIZE, 0);
232 bio->bi_end_io = end_bio_io_page;
233 bio->bi_private = page;
234 submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
235 wait_on_page_locked(page);
237 if (!PageUptodate(page)) {
242 gfs2_sb_in(&sdp->sd_sb, p);
249 * gfs2_read_sb - Read super block
250 * @sdp: The GFS2 superblock
251 * @gl: the glock for the superblock (assumed to be held)
252 * @silent: Don't print message if mount fails
256 int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
258 u32 hash_blocks, ind_blocks, leaf_blocks;
263 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
266 fs_err(sdp, "can't read superblock\n");
270 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
274 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
275 GFS2_BASIC_BLOCK_SHIFT;
276 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
277 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
278 sizeof(struct gfs2_dinode)) / sizeof(u64);
279 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
280 sizeof(struct gfs2_meta_header)) / sizeof(u64);
281 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
282 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
283 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
284 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
285 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
286 sizeof(struct gfs2_meta_header)) /
287 sizeof(struct gfs2_quota_change);
289 /* Compute maximum reservation required to add a entry to a directory */
291 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
295 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
296 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
297 ind_blocks += tmp_blocks;
300 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
302 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
304 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
305 sizeof(struct gfs2_dinode);
306 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
311 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
313 m = do_div(d, sdp->sd_inptrs);
315 if (d != sdp->sd_heightsize[x - 1] || m)
317 sdp->sd_heightsize[x] = space;
319 sdp->sd_max_height = x;
320 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
322 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
323 sizeof(struct gfs2_dinode);
324 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
329 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
331 m = do_div(d, sdp->sd_inptrs);
333 if (d != sdp->sd_jheightsize[x - 1] || m)
335 sdp->sd_jheightsize[x] = space;
337 sdp->sd_max_jheight = x;
338 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
344 * gfs2_jindex_hold - Grab a lock on the jindex
345 * @sdp: The GFS2 superblock
346 * @ji_gh: the holder for the jindex glock
348 * This is very similar to the gfs2_rindex_hold() function, except that
349 * in general we hold the jindex lock for longer periods of time and
350 * we grab it far less frequently (in general) then the rgrp lock.
355 int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
357 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
360 struct gfs2_jdesc *jd;
365 mutex_lock(&sdp->sd_jindex_mutex);
368 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
372 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
373 name.hash = gfs2_disk_hash(name.name, name.len);
375 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
376 if (error == -ENOENT) {
381 gfs2_glock_dq_uninit(ji_gh);
387 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
391 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
392 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
396 error = PTR_ERR(jd->jd_inode);
401 spin_lock(&sdp->sd_jindex_spin);
402 jd->jd_jid = sdp->sd_journals++;
403 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
404 spin_unlock(&sdp->sd_jindex_spin);
407 mutex_unlock(&sdp->sd_jindex_mutex);
413 * gfs2_jindex_free - Clear all the journal index information
414 * @sdp: The GFS2 superblock
418 void gfs2_jindex_free(struct gfs2_sbd *sdp)
420 struct list_head list;
421 struct gfs2_jdesc *jd;
423 spin_lock(&sdp->sd_jindex_spin);
424 list_add(&list, &sdp->sd_jindex_list);
425 list_del_init(&sdp->sd_jindex_list);
426 sdp->sd_journals = 0;
427 spin_unlock(&sdp->sd_jindex_spin);
429 while (!list_empty(&list)) {
430 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
431 list_del(&jd->jd_list);
437 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
439 struct gfs2_jdesc *jd;
442 list_for_each_entry(jd, head, jd_list) {
443 if (jd->jd_jid == jid) {
455 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
457 struct gfs2_jdesc *jd;
459 spin_lock(&sdp->sd_jindex_spin);
460 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
461 spin_unlock(&sdp->sd_jindex_spin);
466 void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
468 struct gfs2_jdesc *jd;
470 spin_lock(&sdp->sd_jindex_spin);
471 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
474 spin_unlock(&sdp->sd_jindex_spin);
477 struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
479 struct gfs2_jdesc *jd;
482 spin_lock(&sdp->sd_jindex_spin);
484 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
491 spin_unlock(&sdp->sd_jindex_spin);
499 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
501 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
502 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
506 if (ip->i_di.di_size < (8 << 20) || ip->i_di.di_size > (1 << 30) ||
507 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
508 gfs2_consist_inode(ip);
511 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
513 error = gfs2_write_alloc_required(ip, 0, ip->i_di.di_size, &ar);
515 gfs2_consist_inode(ip);
523 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
524 * @sdp: the filesystem
529 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
531 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
532 struct gfs2_glock *j_gl = ip->i_gl;
533 struct gfs2_holder t_gh;
534 struct gfs2_log_header_host head;
537 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
541 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
543 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
547 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
553 /* Initialize some head of the log stuff */
554 sdp->sd_log_sequence = head.lh_sequence + 1;
555 gfs2_log_pointers_init(sdp, head.lh_blkno);
557 error = gfs2_quota_init(sdp);
561 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
563 gfs2_glock_dq_uninit(&t_gh);
568 t_gh.gh_flags |= GL_NOCACHE;
569 gfs2_glock_dq_uninit(&t_gh);
575 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
576 * @sdp: the filesystem
581 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
583 struct gfs2_holder t_gh;
586 gfs2_quota_sync(sdp);
587 gfs2_statfs_sync(sdp);
589 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
591 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
594 gfs2_meta_syncfs(sdp);
595 gfs2_log_shutdown(sdp);
597 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
600 gfs2_glock_dq_uninit(&t_gh);
602 gfs2_quota_cleanup(sdp);
607 static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
609 const struct gfs2_statfs_change *str = buf;
611 sc->sc_total = be64_to_cpu(str->sc_total);
612 sc->sc_free = be64_to_cpu(str->sc_free);
613 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
616 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
618 struct gfs2_statfs_change *str = buf;
620 str->sc_total = cpu_to_be64(sc->sc_total);
621 str->sc_free = cpu_to_be64(sc->sc_free);
622 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
625 int gfs2_statfs_init(struct gfs2_sbd *sdp)
627 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
628 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
629 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
630 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
631 struct buffer_head *m_bh, *l_bh;
632 struct gfs2_holder gh;
635 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
640 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
644 if (sdp->sd_args.ar_spectator) {
645 spin_lock(&sdp->sd_statfs_spin);
646 gfs2_statfs_change_in(m_sc, m_bh->b_data +
647 sizeof(struct gfs2_dinode));
648 spin_unlock(&sdp->sd_statfs_spin);
650 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
654 spin_lock(&sdp->sd_statfs_spin);
655 gfs2_statfs_change_in(m_sc, m_bh->b_data +
656 sizeof(struct gfs2_dinode));
657 gfs2_statfs_change_in(l_sc, l_bh->b_data +
658 sizeof(struct gfs2_dinode));
659 spin_unlock(&sdp->sd_statfs_spin);
667 gfs2_glock_dq_uninit(&gh);
671 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
674 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
675 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
676 struct buffer_head *l_bh;
679 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
683 mutex_lock(&sdp->sd_statfs_mutex);
684 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
685 mutex_unlock(&sdp->sd_statfs_mutex);
687 spin_lock(&sdp->sd_statfs_spin);
688 l_sc->sc_total += total;
689 l_sc->sc_free += free;
690 l_sc->sc_dinodes += dinodes;
691 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
692 spin_unlock(&sdp->sd_statfs_spin);
697 int gfs2_statfs_sync(struct gfs2_sbd *sdp)
699 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
700 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
701 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
702 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
703 struct gfs2_holder gh;
704 struct buffer_head *m_bh, *l_bh;
707 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
712 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
716 spin_lock(&sdp->sd_statfs_spin);
717 gfs2_statfs_change_in(m_sc, m_bh->b_data +
718 sizeof(struct gfs2_dinode));
719 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
720 spin_unlock(&sdp->sd_statfs_spin);
723 spin_unlock(&sdp->sd_statfs_spin);
725 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
729 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
733 mutex_lock(&sdp->sd_statfs_mutex);
734 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
735 mutex_unlock(&sdp->sd_statfs_mutex);
737 spin_lock(&sdp->sd_statfs_spin);
738 m_sc->sc_total += l_sc->sc_total;
739 m_sc->sc_free += l_sc->sc_free;
740 m_sc->sc_dinodes += l_sc->sc_dinodes;
741 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
742 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
743 0, sizeof(struct gfs2_statfs_change));
744 spin_unlock(&sdp->sd_statfs_spin);
746 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
747 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
756 gfs2_glock_dq_uninit(&gh);
761 * gfs2_statfs_i - Do a statfs
762 * @sdp: the filesystem
763 * @sg: the sg structure
768 int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
770 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
771 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
773 spin_lock(&sdp->sd_statfs_spin);
776 sc->sc_total += l_sc->sc_total;
777 sc->sc_free += l_sc->sc_free;
778 sc->sc_dinodes += l_sc->sc_dinodes;
780 spin_unlock(&sdp->sd_statfs_spin);
784 if (sc->sc_free > sc->sc_total)
785 sc->sc_free = sc->sc_total;
786 if (sc->sc_dinodes < 0)
793 * statfs_fill - fill in the sg for a given RG
795 * @sc: the sc structure
797 * Returns: 0 on success, -ESTALE if the LVB is invalid
800 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
801 struct gfs2_statfs_change_host *sc)
803 gfs2_rgrp_verify(rgd);
804 sc->sc_total += rgd->rd_data;
805 sc->sc_free += rgd->rd_rg.rg_free;
806 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
811 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
812 * @sdp: the filesystem
813 * @sc: the sc info that will be returned
815 * Any error (other than a signal) will cause this routine to fall back
816 * to the synchronous version.
818 * FIXME: This really shouldn't busy wait like this.
823 int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
825 struct gfs2_holder ri_gh;
826 struct gfs2_rgrpd *rgd_next;
827 struct gfs2_holder *gha, *gh;
828 unsigned int slots = 64;
833 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
834 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
838 error = gfs2_rindex_hold(sdp, &ri_gh);
842 rgd_next = gfs2_rgrpd_get_first(sdp);
847 for (x = 0; x < slots; x++) {
850 if (gh->gh_gl && gfs2_glock_poll(gh)) {
851 err = gfs2_glock_wait(gh);
853 gfs2_holder_uninit(gh);
857 error = statfs_slow_fill(
858 gh->gh_gl->gl_object, sc);
859 gfs2_glock_dq_uninit(gh);
865 else if (rgd_next && !error) {
866 error = gfs2_glock_nq_init(rgd_next->rd_gl,
870 rgd_next = gfs2_rgrpd_get_next(rgd_next);
874 if (signal_pending(current))
875 error = -ERESTARTSYS;
884 gfs2_glock_dq_uninit(&ri_gh);
892 struct list_head list;
893 struct gfs2_holder gh;
897 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
899 * @sdp: the file system
900 * @state: the state to put the transaction lock into
901 * @t_gh: the hold on the transaction lock
906 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
907 struct gfs2_holder *t_gh)
909 struct gfs2_inode *ip;
910 struct gfs2_holder ji_gh;
911 struct gfs2_jdesc *jd;
914 struct gfs2_log_header_host lh;
917 error = gfs2_jindex_hold(sdp, &ji_gh);
921 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
922 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
927 ip = GFS2_I(jd->jd_inode);
928 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
933 list_add(&lfcc->list, &list);
936 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
937 LM_FLAG_PRIORITY | GL_NOCACHE,
940 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
941 error = gfs2_jdesc_check(jd);
944 error = gfs2_find_jhead(jd, &lh);
947 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
954 gfs2_glock_dq_uninit(t_gh);
957 while (!list_empty(&list)) {
958 lfcc = list_entry(list.next, struct lfcc, list);
959 list_del(&lfcc->list);
960 gfs2_glock_dq_uninit(&lfcc->gh);
963 gfs2_glock_dq_uninit(&ji_gh);
968 * gfs2_freeze_fs - freezes the file system
969 * @sdp: the file system
971 * This function flushes data and meta data for all machines by
972 * aquiring the transaction log exclusively. All journals are
973 * ensured to be in a clean state as well.
978 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
982 mutex_lock(&sdp->sd_freeze_lock);
984 if (!sdp->sd_freeze_count++) {
985 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
987 sdp->sd_freeze_count--;
990 mutex_unlock(&sdp->sd_freeze_lock);
996 * gfs2_unfreeze_fs - unfreezes the file system
997 * @sdp: the file system
999 * This function allows the file system to proceed by unlocking
1000 * the exclusively held transaction lock. Other GFS2 nodes are
1001 * now free to acquire the lock shared and go on with their lives.
1005 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
1007 mutex_lock(&sdp->sd_freeze_lock);
1009 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
1010 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1012 mutex_unlock(&sdp->sd_freeze_lock);