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>
19 #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_inoded_secs
= 15;
59 gt
->gt_quota_simul_sync
= 64;
60 gt
->gt_quota_warn_period
= 10;
61 gt
->gt_quota_scale_num
= 1;
62 gt
->gt_quota_scale_den
= 1;
63 gt
->gt_quota_cache_secs
= 300;
64 gt
->gt_quota_quantum
= 60;
65 gt
->gt_atime_quantum
= 3600;
66 gt
->gt_new_files_jdata
= 0;
67 gt
->gt_new_files_directio
= 0;
68 gt
->gt_max_atomic_write
= 4 << 20;
69 gt
->gt_max_readahead
= 1 << 18;
70 gt
->gt_lockdump_size
= 131072;
71 gt
->gt_stall_secs
= 600;
72 gt
->gt_complain_secs
= 10;
73 gt
->gt_reclaim_limit
= 5000;
74 gt
->gt_entries_per_readdir
= 32;
75 gt
->gt_prefetch_secs
= 10;
76 gt
->gt_greedy_default
= HZ
/ 10;
77 gt
->gt_greedy_quantum
= HZ
/ 40;
78 gt
->gt_greedy_max
= HZ
/ 4;
79 gt
->gt_statfs_quantum
= 30;
80 gt
->gt_statfs_slow
= 0;
84 * gfs2_check_sb - Check superblock
85 * @sdp: the filesystem
87 * @silent: Don't print a message if the check fails
89 * Checks the version code of the FS is one that we understand how to
90 * read and that the sizes of the various on-disk structures have not
94 int gfs2_check_sb(struct gfs2_sbd
*sdp
, struct gfs2_sb
*sb
, int silent
)
98 if (sb
->sb_header
.mh_magic
!= GFS2_MAGIC
||
99 sb
->sb_header
.mh_type
!= GFS2_METATYPE_SB
) {
101 printk(KERN_WARNING
"GFS2: not a GFS2 filesystem\n");
105 /* If format numbers match exactly, we're done. */
107 if (sb
->sb_fs_format
== GFS2_FORMAT_FS
&&
108 sb
->sb_multihost_format
== GFS2_FORMAT_MULTI
)
111 if (sb
->sb_fs_format
!= GFS2_FORMAT_FS
) {
112 for (x
= 0; gfs2_old_fs_formats
[x
]; x
++)
113 if (gfs2_old_fs_formats
[x
] == sb
->sb_fs_format
)
116 if (!gfs2_old_fs_formats
[x
]) {
118 "GFS2: code version (%u, %u) is incompatible "
119 "with ondisk format (%u, %u)\n",
120 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
121 sb
->sb_fs_format
, sb
->sb_multihost_format
);
123 "GFS2: I don't know how to upgrade this FS\n");
128 if (sb
->sb_multihost_format
!= GFS2_FORMAT_MULTI
) {
129 for (x
= 0; gfs2_old_multihost_formats
[x
]; x
++)
130 if (gfs2_old_multihost_formats
[x
] ==
131 sb
->sb_multihost_format
)
134 if (!gfs2_old_multihost_formats
[x
]) {
136 "GFS2: code version (%u, %u) is incompatible "
137 "with ondisk format (%u, %u)\n",
138 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
139 sb
->sb_fs_format
, sb
->sb_multihost_format
);
141 "GFS2: I don't know how to upgrade this FS\n");
146 if (!sdp
->sd_args
.ar_upgrade
) {
148 "GFS2: code version (%u, %u) is incompatible "
149 "with ondisk format (%u, %u)\n",
150 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
151 sb
->sb_fs_format
, sb
->sb_multihost_format
);
153 "GFS2: Use the \"upgrade\" mount option to upgrade "
155 printk(KERN_INFO
"GFS2: See the manual for more details\n");
163 * gfs2_read_sb - Read super block
164 * @sdp: The GFS2 superblock
165 * @gl: the glock for the superblock (assumed to be held)
166 * @silent: Don't print message if mount fails
170 int gfs2_read_sb(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
, int silent
)
172 struct buffer_head
*bh
;
173 uint32_t hash_blocks
, ind_blocks
, leaf_blocks
;
178 error
= gfs2_meta_read(gl
, GFS2_SB_ADDR
>> sdp
->sd_fsb2bb_shift
,
179 DIO_FORCE
| DIO_START
| DIO_WAIT
, &bh
);
182 fs_err(sdp
, "can't read superblock\n");
186 gfs2_assert(sdp
, sizeof(struct gfs2_sb
) <= bh
->b_size
);
187 gfs2_sb_in(&sdp
->sd_sb
, bh
->b_data
);
190 error
= gfs2_check_sb(sdp
, &sdp
->sd_sb
, silent
);
194 sdp
->sd_fsb2bb_shift
= sdp
->sd_sb
.sb_bsize_shift
-
195 GFS2_BASIC_BLOCK_SHIFT
;
196 sdp
->sd_fsb2bb
= 1 << sdp
->sd_fsb2bb_shift
;
197 sdp
->sd_diptrs
= (sdp
->sd_sb
.sb_bsize
-
198 sizeof(struct gfs2_dinode
)) / sizeof(uint64_t);
199 sdp
->sd_inptrs
= (sdp
->sd_sb
.sb_bsize
-
200 sizeof(struct gfs2_meta_header
)) / sizeof(uint64_t);
201 sdp
->sd_jbsize
= sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_meta_header
);
202 sdp
->sd_hash_bsize
= sdp
->sd_sb
.sb_bsize
/ 2;
203 sdp
->sd_hash_bsize_shift
= sdp
->sd_sb
.sb_bsize_shift
- 1;
204 sdp
->sd_hash_ptrs
= sdp
->sd_hash_bsize
/ sizeof(uint64_t);
205 sdp
->sd_ut_per_block
= (sdp
->sd_sb
.sb_bsize
-
206 sizeof(struct gfs2_meta_header
)) /
207 sizeof(struct gfs2_unlinked_tag
);
208 sdp
->sd_qc_per_block
= (sdp
->sd_sb
.sb_bsize
-
209 sizeof(struct gfs2_meta_header
)) /
210 sizeof(struct gfs2_quota_change
);
212 /* Compute maximum reservation required to add a entry to a directory */
214 hash_blocks
= DIV_ROUND_UP(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH
),
218 for (tmp_blocks
= hash_blocks
; tmp_blocks
> sdp
->sd_diptrs
;) {
219 tmp_blocks
= DIV_ROUND_UP(tmp_blocks
, sdp
->sd_inptrs
);
220 ind_blocks
+= tmp_blocks
;
223 leaf_blocks
= 2 + GFS2_DIR_MAX_DEPTH
;
225 sdp
->sd_max_dirres
= hash_blocks
+ ind_blocks
+ leaf_blocks
;
227 sdp
->sd_heightsize
[0] = sdp
->sd_sb
.sb_bsize
-
228 sizeof(struct gfs2_dinode
);
229 sdp
->sd_heightsize
[1] = sdp
->sd_sb
.sb_bsize
* sdp
->sd_diptrs
;
234 space
= sdp
->sd_heightsize
[x
- 1] * sdp
->sd_inptrs
;
236 m
= do_div(d
, sdp
->sd_inptrs
);
238 if (d
!= sdp
->sd_heightsize
[x
- 1] || m
)
240 sdp
->sd_heightsize
[x
] = space
;
242 sdp
->sd_max_height
= x
;
243 gfs2_assert(sdp
, sdp
->sd_max_height
<= GFS2_MAX_META_HEIGHT
);
245 sdp
->sd_jheightsize
[0] = sdp
->sd_sb
.sb_bsize
-
246 sizeof(struct gfs2_dinode
);
247 sdp
->sd_jheightsize
[1] = sdp
->sd_jbsize
* sdp
->sd_diptrs
;
252 space
= sdp
->sd_jheightsize
[x
- 1] * sdp
->sd_inptrs
;
254 m
= do_div(d
, sdp
->sd_inptrs
);
256 if (d
!= sdp
->sd_jheightsize
[x
- 1] || m
)
258 sdp
->sd_jheightsize
[x
] = space
;
260 sdp
->sd_max_jheight
= x
;
261 gfs2_assert(sdp
, sdp
->sd_max_jheight
<= GFS2_MAX_META_HEIGHT
);
267 * gfs2_jindex_hold - Grab a lock on the jindex
268 * @sdp: The GFS2 superblock
269 * @ji_gh: the holder for the jindex glock
271 * This is very similar to the gfs2_rindex_hold() function, except that
272 * in general we hold the jindex lock for longer periods of time and
273 * we grab it far less frequently (in general) then the rgrp lock.
278 int gfs2_jindex_hold(struct gfs2_sbd
*sdp
, struct gfs2_holder
*ji_gh
)
280 struct gfs2_inode
*dip
= sdp
->sd_jindex
->u
.generic_ip
;
283 struct gfs2_jdesc
*jd
;
288 mutex_lock(&sdp
->sd_jindex_mutex
);
291 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
,
292 GL_LOCAL_EXCL
, ji_gh
);
296 name
.len
= sprintf(buf
, "journal%u", sdp
->sd_journals
);
297 name
.hash
= gfs2_disk_hash(name
.name
, name
.len
);
299 error
= gfs2_dir_search(sdp
->sd_jindex
,
301 if (error
== -ENOENT
) {
306 gfs2_glock_dq_uninit(ji_gh
);
312 jd
= kzalloc(sizeof(struct gfs2_jdesc
), GFP_KERNEL
);
316 jd
->jd_inode
= gfs2_lookupi(sdp
->sd_jindex
, &name
, 1, NULL
);
317 if (!jd
->jd_inode
|| IS_ERR(jd
->jd_inode
)) {
321 error
= PTR_ERR(jd
->jd_inode
);
326 spin_lock(&sdp
->sd_jindex_spin
);
327 jd
->jd_jid
= sdp
->sd_journals
++;
328 list_add_tail(&jd
->jd_list
, &sdp
->sd_jindex_list
);
329 spin_unlock(&sdp
->sd_jindex_spin
);
332 mutex_unlock(&sdp
->sd_jindex_mutex
);
338 * gfs2_jindex_free - Clear all the journal index information
339 * @sdp: The GFS2 superblock
343 void gfs2_jindex_free(struct gfs2_sbd
*sdp
)
345 struct list_head list
;
346 struct gfs2_jdesc
*jd
;
348 spin_lock(&sdp
->sd_jindex_spin
);
349 list_add(&list
, &sdp
->sd_jindex_list
);
350 list_del_init(&sdp
->sd_jindex_list
);
351 sdp
->sd_journals
= 0;
352 spin_unlock(&sdp
->sd_jindex_spin
);
354 while (!list_empty(&list
)) {
355 jd
= list_entry(list
.next
, struct gfs2_jdesc
, jd_list
);
356 list_del(&jd
->jd_list
);
362 static struct gfs2_jdesc
*jdesc_find_i(struct list_head
*head
, unsigned int jid
)
364 struct gfs2_jdesc
*jd
;
367 list_for_each_entry(jd
, head
, jd_list
) {
368 if (jd
->jd_jid
== jid
) {
380 struct gfs2_jdesc
*gfs2_jdesc_find(struct gfs2_sbd
*sdp
, unsigned int jid
)
382 struct gfs2_jdesc
*jd
;
384 spin_lock(&sdp
->sd_jindex_spin
);
385 jd
= jdesc_find_i(&sdp
->sd_jindex_list
, jid
);
386 spin_unlock(&sdp
->sd_jindex_spin
);
391 void gfs2_jdesc_make_dirty(struct gfs2_sbd
*sdp
, unsigned int jid
)
393 struct gfs2_jdesc
*jd
;
395 spin_lock(&sdp
->sd_jindex_spin
);
396 jd
= jdesc_find_i(&sdp
->sd_jindex_list
, jid
);
399 spin_unlock(&sdp
->sd_jindex_spin
);
402 struct gfs2_jdesc
*gfs2_jdesc_find_dirty(struct gfs2_sbd
*sdp
)
404 struct gfs2_jdesc
*jd
;
407 spin_lock(&sdp
->sd_jindex_spin
);
409 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
416 spin_unlock(&sdp
->sd_jindex_spin
);
424 int gfs2_jdesc_check(struct gfs2_jdesc
*jd
)
426 struct gfs2_inode
*ip
= jd
->jd_inode
->u
.generic_ip
;
427 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
431 if (ip
->i_di
.di_size
< (8 << 20) ||
432 ip
->i_di
.di_size
> (1 << 30) ||
433 (ip
->i_di
.di_size
& (sdp
->sd_sb
.sb_bsize
- 1))) {
434 gfs2_consist_inode(ip
);
437 jd
->jd_blocks
= ip
->i_di
.di_size
>> sdp
->sd_sb
.sb_bsize_shift
;
439 error
= gfs2_write_alloc_required(ip
,
443 gfs2_consist_inode(ip
);
451 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
452 * @sdp: the filesystem
457 int gfs2_make_fs_rw(struct gfs2_sbd
*sdp
)
459 struct gfs2_inode
*ip
= sdp
->sd_jdesc
->jd_inode
->u
.generic_ip
;
460 struct gfs2_glock
*j_gl
= ip
->i_gl
;
461 struct gfs2_holder t_gh
;
462 struct gfs2_log_header head
;
465 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
,
466 GL_LOCAL_EXCL
, &t_gh
);
470 gfs2_meta_cache_flush(ip
);
471 j_gl
->gl_ops
->go_inval(j_gl
, DIO_METADATA
| DIO_DATA
);
473 error
= gfs2_find_jhead(sdp
->sd_jdesc
, &head
);
477 if (!(head
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
483 /* Initialize some head of the log stuff */
484 sdp
->sd_log_sequence
= head
.lh_sequence
+ 1;
485 gfs2_log_pointers_init(sdp
, head
.lh_blkno
);
487 error
= gfs2_unlinked_init(sdp
);
490 error
= gfs2_quota_init(sdp
);
494 set_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
496 gfs2_glock_dq_uninit(&t_gh
);
501 gfs2_unlinked_cleanup(sdp
);
504 t_gh
.gh_flags
|= GL_NOCACHE
;
505 gfs2_glock_dq_uninit(&t_gh
);
511 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
512 * @sdp: the filesystem
517 int gfs2_make_fs_ro(struct gfs2_sbd
*sdp
)
519 struct gfs2_holder t_gh
;
522 gfs2_unlinked_dealloc(sdp
);
523 gfs2_quota_sync(sdp
);
524 gfs2_statfs_sync(sdp
);
526 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
,
527 GL_LOCAL_EXCL
| GL_NOCACHE
,
529 if (error
&& !test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
))
532 gfs2_meta_syncfs(sdp
);
533 gfs2_log_shutdown(sdp
);
535 clear_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
538 gfs2_glock_dq_uninit(&t_gh
);
540 gfs2_unlinked_cleanup(sdp
);
541 gfs2_quota_cleanup(sdp
);
546 int gfs2_statfs_init(struct gfs2_sbd
*sdp
)
548 struct gfs2_inode
*m_ip
= sdp
->sd_statfs_inode
->u
.generic_ip
;
549 struct gfs2_statfs_change
*m_sc
= &sdp
->sd_statfs_master
;
550 struct gfs2_inode
*l_ip
= sdp
->sd_sc_inode
->u
.generic_ip
;
551 struct gfs2_statfs_change
*l_sc
= &sdp
->sd_statfs_local
;
552 struct buffer_head
*m_bh
, *l_bh
;
553 struct gfs2_holder gh
;
556 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
561 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
565 if (sdp
->sd_args
.ar_spectator
) {
566 spin_lock(&sdp
->sd_statfs_spin
);
567 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
568 sizeof(struct gfs2_dinode
));
569 spin_unlock(&sdp
->sd_statfs_spin
);
571 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
575 spin_lock(&sdp
->sd_statfs_spin
);
576 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
577 sizeof(struct gfs2_dinode
));
578 gfs2_statfs_change_in(l_sc
, l_bh
->b_data
+
579 sizeof(struct gfs2_dinode
));
580 spin_unlock(&sdp
->sd_statfs_spin
);
589 gfs2_glock_dq_uninit(&gh
);
594 void gfs2_statfs_change(struct gfs2_sbd
*sdp
, int64_t total
, int64_t free
,
597 struct gfs2_inode
*l_ip
= sdp
->sd_sc_inode
->u
.generic_ip
;
598 struct gfs2_statfs_change
*l_sc
= &sdp
->sd_statfs_local
;
599 struct buffer_head
*l_bh
;
602 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
606 mutex_lock(&sdp
->sd_statfs_mutex
);
607 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
608 mutex_unlock(&sdp
->sd_statfs_mutex
);
610 spin_lock(&sdp
->sd_statfs_spin
);
611 l_sc
->sc_total
+= total
;
612 l_sc
->sc_free
+= free
;
613 l_sc
->sc_dinodes
+= dinodes
;
614 gfs2_statfs_change_out(l_sc
, l_bh
->b_data
+
615 sizeof(struct gfs2_dinode
));
616 spin_unlock(&sdp
->sd_statfs_spin
);
621 int gfs2_statfs_sync(struct gfs2_sbd
*sdp
)
623 struct gfs2_inode
*m_ip
= sdp
->sd_statfs_inode
->u
.generic_ip
;
624 struct gfs2_inode
*l_ip
= sdp
->sd_sc_inode
->u
.generic_ip
;
625 struct gfs2_statfs_change
*m_sc
= &sdp
->sd_statfs_master
;
626 struct gfs2_statfs_change
*l_sc
= &sdp
->sd_statfs_local
;
627 struct gfs2_holder gh
;
628 struct buffer_head
*m_bh
, *l_bh
;
631 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
636 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
640 spin_lock(&sdp
->sd_statfs_spin
);
641 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
642 sizeof(struct gfs2_dinode
));
643 if (!l_sc
->sc_total
&& !l_sc
->sc_free
&& !l_sc
->sc_dinodes
) {
644 spin_unlock(&sdp
->sd_statfs_spin
);
647 spin_unlock(&sdp
->sd_statfs_spin
);
649 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
653 error
= gfs2_trans_begin(sdp
, 2 * RES_DINODE
, 0);
657 mutex_lock(&sdp
->sd_statfs_mutex
);
658 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
659 mutex_unlock(&sdp
->sd_statfs_mutex
);
661 spin_lock(&sdp
->sd_statfs_spin
);
662 m_sc
->sc_total
+= l_sc
->sc_total
;
663 m_sc
->sc_free
+= l_sc
->sc_free
;
664 m_sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
665 memset(l_sc
, 0, sizeof(struct gfs2_statfs_change
));
666 memset(l_bh
->b_data
+ sizeof(struct gfs2_dinode
),
667 0, sizeof(struct gfs2_statfs_change
));
668 spin_unlock(&sdp
->sd_statfs_spin
);
670 gfs2_trans_add_bh(m_ip
->i_gl
, m_bh
, 1);
671 gfs2_statfs_change_out(m_sc
, m_bh
->b_data
+ sizeof(struct gfs2_dinode
));
682 gfs2_glock_dq_uninit(&gh
);
688 * gfs2_statfs_i - Do a statfs
689 * @sdp: the filesystem
690 * @sg: the sg structure
695 int gfs2_statfs_i(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change
*sc
)
697 struct gfs2_statfs_change
*m_sc
= &sdp
->sd_statfs_master
;
698 struct gfs2_statfs_change
*l_sc
= &sdp
->sd_statfs_local
;
700 spin_lock(&sdp
->sd_statfs_spin
);
703 sc
->sc_total
+= l_sc
->sc_total
;
704 sc
->sc_free
+= l_sc
->sc_free
;
705 sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
707 spin_unlock(&sdp
->sd_statfs_spin
);
711 if (sc
->sc_free
> sc
->sc_total
)
712 sc
->sc_free
= sc
->sc_total
;
713 if (sc
->sc_dinodes
< 0)
720 * statfs_fill - fill in the sg for a given RG
722 * @sc: the sc structure
724 * Returns: 0 on success, -ESTALE if the LVB is invalid
727 static int statfs_slow_fill(struct gfs2_rgrpd
*rgd
,
728 struct gfs2_statfs_change
*sc
)
730 gfs2_rgrp_verify(rgd
);
731 sc
->sc_total
+= rgd
->rd_ri
.ri_data
;
732 sc
->sc_free
+= rgd
->rd_rg
.rg_free
;
733 sc
->sc_dinodes
+= rgd
->rd_rg
.rg_dinodes
;
738 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
739 * @sdp: the filesystem
740 * @sc: the sc info that will be returned
742 * Any error (other than a signal) will cause this routine to fall back
743 * to the synchronous version.
745 * FIXME: This really shouldn't busy wait like this.
750 int gfs2_statfs_slow(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change
*sc
)
752 struct gfs2_holder ri_gh
;
753 struct gfs2_rgrpd
*rgd_next
;
754 struct gfs2_holder
*gha
, *gh
;
755 unsigned int slots
= 64;
760 memset(sc
, 0, sizeof(struct gfs2_statfs_change
));
761 gha
= kcalloc(slots
, sizeof(struct gfs2_holder
), GFP_KERNEL
);
765 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
769 rgd_next
= gfs2_rgrpd_get_first(sdp
);
774 for (x
= 0; x
< slots
; x
++) {
777 if (gh
->gh_gl
&& gfs2_glock_poll(gh
)) {
778 err
= gfs2_glock_wait(gh
);
780 gfs2_holder_uninit(gh
);
784 error
= statfs_slow_fill(
785 gh
->gh_gl
->gl_object
, sc
);
786 gfs2_glock_dq_uninit(gh
);
792 else if (rgd_next
&& !error
) {
793 error
= gfs2_glock_nq_init(rgd_next
->rd_gl
,
797 rgd_next
= gfs2_rgrpd_get_next(rgd_next
);
801 if (signal_pending(current
))
802 error
= -ERESTARTSYS
;
811 gfs2_glock_dq_uninit(&ri_gh
);
820 struct list_head list
;
821 struct gfs2_holder gh
;
825 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
827 * @sdp: the file system
828 * @state: the state to put the transaction lock into
829 * @t_gh: the hold on the transaction lock
834 static int gfs2_lock_fs_check_clean(struct gfs2_sbd
*sdp
,
835 struct gfs2_holder
*t_gh
)
837 struct gfs2_inode
*ip
;
838 struct gfs2_holder ji_gh
;
839 struct gfs2_jdesc
*jd
;
842 struct gfs2_log_header lh
;
845 error
= gfs2_jindex_hold(sdp
, &ji_gh
);
849 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
850 lfcc
= kmalloc(sizeof(struct lfcc
), GFP_KERNEL
);
855 ip
= jd
->jd_inode
->u
.generic_ip
;
856 error
= gfs2_glock_nq_init(ip
->i_gl
,
863 list_add(&lfcc
->list
, &list
);
866 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_DEFERRED
,
867 LM_FLAG_PRIORITY
| GL_NOCACHE
,
870 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
871 error
= gfs2_jdesc_check(jd
);
874 error
= gfs2_find_jhead(jd
, &lh
);
877 if (!(lh
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
884 gfs2_glock_dq_uninit(t_gh
);
887 while (!list_empty(&list
)) {
888 lfcc
= list_entry(list
.next
, struct lfcc
, list
);
889 list_del(&lfcc
->list
);
890 gfs2_glock_dq_uninit(&lfcc
->gh
);
893 gfs2_glock_dq_uninit(&ji_gh
);
899 * gfs2_freeze_fs - freezes the file system
900 * @sdp: the file system
902 * This function flushes data and meta data for all machines by
903 * aquiring the transaction log exclusively. All journals are
904 * ensured to be in a clean state as well.
909 int gfs2_freeze_fs(struct gfs2_sbd
*sdp
)
913 mutex_lock(&sdp
->sd_freeze_lock
);
915 if (!sdp
->sd_freeze_count
++) {
916 error
= gfs2_lock_fs_check_clean(sdp
, &sdp
->sd_freeze_gh
);
918 sdp
->sd_freeze_count
--;
921 mutex_unlock(&sdp
->sd_freeze_lock
);
927 * gfs2_unfreeze_fs - unfreezes the file system
928 * @sdp: the file system
930 * This function allows the file system to proceed by unlocking
931 * the exclusively held transaction lock. Other GFS2 nodes are
932 * now free to acquire the lock shared and go on with their lives.
936 void gfs2_unfreeze_fs(struct gfs2_sbd
*sdp
)
938 mutex_lock(&sdp
->sd_freeze_lock
);
940 if (sdp
->sd_freeze_count
&& !--sdp
->sd_freeze_count
)
941 gfs2_glock_dq_uninit(&sdp
->sd_freeze_gh
);
943 mutex_unlock(&sdp
->sd_freeze_lock
);