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"
37 * gfs2_tune_init - Fill a gfs2_tune structure with default values
42 void gfs2_tune_init(struct gfs2_tune
*gt
)
44 spin_lock_init(>
->gt_spin
);
47 gt
->gt_ilimit_tries
= 3;
48 gt
->gt_ilimit_min
= 1;
49 gt
->gt_demote_secs
= 300;
50 gt
->gt_incore_log_blocks
= 1024;
51 gt
->gt_log_flush_secs
= 60;
52 gt
->gt_jindex_refresh_secs
= 60;
53 gt
->gt_scand_secs
= 15;
54 gt
->gt_recoverd_secs
= 60;
56 gt
->gt_quotad_secs
= 5;
57 gt
->gt_quota_simul_sync
= 64;
58 gt
->gt_quota_warn_period
= 10;
59 gt
->gt_quota_scale_num
= 1;
60 gt
->gt_quota_scale_den
= 1;
61 gt
->gt_quota_cache_secs
= 300;
62 gt
->gt_quota_quantum
= 60;
63 gt
->gt_atime_quantum
= 3600;
64 gt
->gt_new_files_jdata
= 0;
65 gt
->gt_new_files_directio
= 0;
66 gt
->gt_max_atomic_write
= 4 << 20;
67 gt
->gt_max_readahead
= 1 << 18;
68 gt
->gt_lockdump_size
= 131072;
69 gt
->gt_stall_secs
= 600;
70 gt
->gt_complain_secs
= 10;
71 gt
->gt_reclaim_limit
= 5000;
72 gt
->gt_entries_per_readdir
= 32;
73 gt
->gt_prefetch_secs
= 10;
74 gt
->gt_greedy_default
= HZ
/ 10;
75 gt
->gt_greedy_quantum
= HZ
/ 40;
76 gt
->gt_greedy_max
= HZ
/ 4;
77 gt
->gt_statfs_quantum
= 30;
78 gt
->gt_statfs_slow
= 0;
82 * gfs2_check_sb - Check superblock
83 * @sdp: the filesystem
85 * @silent: Don't print a message if the check fails
87 * Checks the version code of the FS is one that we understand how to
88 * read and that the sizes of the various on-disk structures have not
92 int gfs2_check_sb(struct gfs2_sbd
*sdp
, struct gfs2_sb
*sb
, int silent
)
96 if (sb
->sb_header
.mh_magic
!= GFS2_MAGIC
||
97 sb
->sb_header
.mh_type
!= GFS2_METATYPE_SB
) {
99 printk(KERN_WARNING
"GFS2: not a GFS2 filesystem\n");
103 /* If format numbers match exactly, we're done. */
105 if (sb
->sb_fs_format
== GFS2_FORMAT_FS
&&
106 sb
->sb_multihost_format
== GFS2_FORMAT_MULTI
)
109 if (sb
->sb_fs_format
!= GFS2_FORMAT_FS
) {
110 for (x
= 0; gfs2_old_fs_formats
[x
]; x
++)
111 if (gfs2_old_fs_formats
[x
] == sb
->sb_fs_format
)
114 if (!gfs2_old_fs_formats
[x
]) {
116 "GFS2: code version (%u, %u) is incompatible "
117 "with ondisk format (%u, %u)\n",
118 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
119 sb
->sb_fs_format
, sb
->sb_multihost_format
);
121 "GFS2: I don't know how to upgrade this FS\n");
126 if (sb
->sb_multihost_format
!= GFS2_FORMAT_MULTI
) {
127 for (x
= 0; gfs2_old_multihost_formats
[x
]; x
++)
128 if (gfs2_old_multihost_formats
[x
] ==
129 sb
->sb_multihost_format
)
132 if (!gfs2_old_multihost_formats
[x
]) {
134 "GFS2: code version (%u, %u) is incompatible "
135 "with ondisk format (%u, %u)\n",
136 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
137 sb
->sb_fs_format
, sb
->sb_multihost_format
);
139 "GFS2: I don't know how to upgrade this FS\n");
144 if (!sdp
->sd_args
.ar_upgrade
) {
146 "GFS2: code version (%u, %u) is incompatible "
147 "with ondisk format (%u, %u)\n",
148 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
149 sb
->sb_fs_format
, sb
->sb_multihost_format
);
151 "GFS2: Use the \"upgrade\" mount option to upgrade "
153 printk(KERN_INFO
"GFS2: See the manual for more details\n");
161 * gfs2_read_sb - Read super block
162 * @sdp: The GFS2 superblock
163 * @gl: the glock for the superblock (assumed to be held)
164 * @silent: Don't print message if mount fails
168 int gfs2_read_sb(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
, int silent
)
170 struct buffer_head
*bh
;
171 uint32_t hash_blocks
, ind_blocks
, leaf_blocks
;
176 error
= gfs2_meta_read(gl
, GFS2_SB_ADDR
>> sdp
->sd_fsb2bb_shift
,
177 DIO_FORCE
| DIO_START
| DIO_WAIT
, &bh
);
180 fs_err(sdp
, "can't read superblock\n");
184 gfs2_assert(sdp
, sizeof(struct gfs2_sb
) <= bh
->b_size
);
185 gfs2_sb_in(&sdp
->sd_sb
, bh
->b_data
);
188 error
= gfs2_check_sb(sdp
, &sdp
->sd_sb
, silent
);
192 sdp
->sd_fsb2bb_shift
= sdp
->sd_sb
.sb_bsize_shift
-
193 GFS2_BASIC_BLOCK_SHIFT
;
194 sdp
->sd_fsb2bb
= 1 << sdp
->sd_fsb2bb_shift
;
195 sdp
->sd_diptrs
= (sdp
->sd_sb
.sb_bsize
-
196 sizeof(struct gfs2_dinode
)) / sizeof(uint64_t);
197 sdp
->sd_inptrs
= (sdp
->sd_sb
.sb_bsize
-
198 sizeof(struct gfs2_meta_header
)) / sizeof(uint64_t);
199 sdp
->sd_jbsize
= sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_meta_header
);
200 sdp
->sd_hash_bsize
= sdp
->sd_sb
.sb_bsize
/ 2;
201 sdp
->sd_hash_bsize_shift
= sdp
->sd_sb
.sb_bsize_shift
- 1;
202 sdp
->sd_hash_ptrs
= sdp
->sd_hash_bsize
/ sizeof(uint64_t);
203 sdp
->sd_qc_per_block
= (sdp
->sd_sb
.sb_bsize
-
204 sizeof(struct gfs2_meta_header
)) /
205 sizeof(struct gfs2_quota_change
);
207 /* Compute maximum reservation required to add a entry to a directory */
209 hash_blocks
= DIV_ROUND_UP(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH
),
213 for (tmp_blocks
= hash_blocks
; tmp_blocks
> sdp
->sd_diptrs
;) {
214 tmp_blocks
= DIV_ROUND_UP(tmp_blocks
, sdp
->sd_inptrs
);
215 ind_blocks
+= tmp_blocks
;
218 leaf_blocks
= 2 + GFS2_DIR_MAX_DEPTH
;
220 sdp
->sd_max_dirres
= hash_blocks
+ ind_blocks
+ leaf_blocks
;
222 sdp
->sd_heightsize
[0] = sdp
->sd_sb
.sb_bsize
-
223 sizeof(struct gfs2_dinode
);
224 sdp
->sd_heightsize
[1] = sdp
->sd_sb
.sb_bsize
* sdp
->sd_diptrs
;
229 space
= sdp
->sd_heightsize
[x
- 1] * sdp
->sd_inptrs
;
231 m
= do_div(d
, sdp
->sd_inptrs
);
233 if (d
!= sdp
->sd_heightsize
[x
- 1] || m
)
235 sdp
->sd_heightsize
[x
] = space
;
237 sdp
->sd_max_height
= x
;
238 gfs2_assert(sdp
, sdp
->sd_max_height
<= GFS2_MAX_META_HEIGHT
);
240 sdp
->sd_jheightsize
[0] = sdp
->sd_sb
.sb_bsize
-
241 sizeof(struct gfs2_dinode
);
242 sdp
->sd_jheightsize
[1] = sdp
->sd_jbsize
* sdp
->sd_diptrs
;
247 space
= sdp
->sd_jheightsize
[x
- 1] * sdp
->sd_inptrs
;
249 m
= do_div(d
, sdp
->sd_inptrs
);
251 if (d
!= sdp
->sd_jheightsize
[x
- 1] || m
)
253 sdp
->sd_jheightsize
[x
] = space
;
255 sdp
->sd_max_jheight
= x
;
256 gfs2_assert(sdp
, sdp
->sd_max_jheight
<= GFS2_MAX_META_HEIGHT
);
262 * gfs2_jindex_hold - Grab a lock on the jindex
263 * @sdp: The GFS2 superblock
264 * @ji_gh: the holder for the jindex glock
266 * This is very similar to the gfs2_rindex_hold() function, except that
267 * in general we hold the jindex lock for longer periods of time and
268 * we grab it far less frequently (in general) then the rgrp lock.
273 int gfs2_jindex_hold(struct gfs2_sbd
*sdp
, struct gfs2_holder
*ji_gh
)
275 struct gfs2_inode
*dip
= GFS2_I(sdp
->sd_jindex
);
278 struct gfs2_jdesc
*jd
;
283 mutex_lock(&sdp
->sd_jindex_mutex
);
286 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
,
287 GL_LOCAL_EXCL
, ji_gh
);
291 name
.len
= sprintf(buf
, "journal%u", sdp
->sd_journals
);
292 name
.hash
= gfs2_disk_hash(name
.name
, name
.len
);
294 error
= gfs2_dir_search(sdp
->sd_jindex
, &name
, NULL
, NULL
);
295 if (error
== -ENOENT
) {
300 gfs2_glock_dq_uninit(ji_gh
);
306 jd
= kzalloc(sizeof(struct gfs2_jdesc
), GFP_KERNEL
);
310 jd
->jd_inode
= gfs2_lookupi(sdp
->sd_jindex
, &name
, 1, NULL
);
311 if (!jd
->jd_inode
|| IS_ERR(jd
->jd_inode
)) {
315 error
= PTR_ERR(jd
->jd_inode
);
320 spin_lock(&sdp
->sd_jindex_spin
);
321 jd
->jd_jid
= sdp
->sd_journals
++;
322 list_add_tail(&jd
->jd_list
, &sdp
->sd_jindex_list
);
323 spin_unlock(&sdp
->sd_jindex_spin
);
326 mutex_unlock(&sdp
->sd_jindex_mutex
);
332 * gfs2_jindex_free - Clear all the journal index information
333 * @sdp: The GFS2 superblock
337 void gfs2_jindex_free(struct gfs2_sbd
*sdp
)
339 struct list_head list
;
340 struct gfs2_jdesc
*jd
;
342 spin_lock(&sdp
->sd_jindex_spin
);
343 list_add(&list
, &sdp
->sd_jindex_list
);
344 list_del_init(&sdp
->sd_jindex_list
);
345 sdp
->sd_journals
= 0;
346 spin_unlock(&sdp
->sd_jindex_spin
);
348 while (!list_empty(&list
)) {
349 jd
= list_entry(list
.next
, struct gfs2_jdesc
, jd_list
);
350 list_del(&jd
->jd_list
);
356 static struct gfs2_jdesc
*jdesc_find_i(struct list_head
*head
, unsigned int jid
)
358 struct gfs2_jdesc
*jd
;
361 list_for_each_entry(jd
, head
, jd_list
) {
362 if (jd
->jd_jid
== jid
) {
374 struct gfs2_jdesc
*gfs2_jdesc_find(struct gfs2_sbd
*sdp
, unsigned int jid
)
376 struct gfs2_jdesc
*jd
;
378 spin_lock(&sdp
->sd_jindex_spin
);
379 jd
= jdesc_find_i(&sdp
->sd_jindex_list
, jid
);
380 spin_unlock(&sdp
->sd_jindex_spin
);
385 void gfs2_jdesc_make_dirty(struct gfs2_sbd
*sdp
, unsigned int jid
)
387 struct gfs2_jdesc
*jd
;
389 spin_lock(&sdp
->sd_jindex_spin
);
390 jd
= jdesc_find_i(&sdp
->sd_jindex_list
, jid
);
393 spin_unlock(&sdp
->sd_jindex_spin
);
396 struct gfs2_jdesc
*gfs2_jdesc_find_dirty(struct gfs2_sbd
*sdp
)
398 struct gfs2_jdesc
*jd
;
401 spin_lock(&sdp
->sd_jindex_spin
);
403 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
410 spin_unlock(&sdp
->sd_jindex_spin
);
418 int gfs2_jdesc_check(struct gfs2_jdesc
*jd
)
420 struct gfs2_inode
*ip
= GFS2_I(jd
->jd_inode
);
421 struct gfs2_sbd
*sdp
= GFS2_SB(jd
->jd_inode
);
425 if (ip
->i_di
.di_size
< (8 << 20) || ip
->i_di
.di_size
> (1 << 30) ||
426 (ip
->i_di
.di_size
& (sdp
->sd_sb
.sb_bsize
- 1))) {
427 gfs2_consist_inode(ip
);
430 jd
->jd_blocks
= ip
->i_di
.di_size
>> sdp
->sd_sb
.sb_bsize_shift
;
432 error
= gfs2_write_alloc_required(ip
, 0, ip
->i_di
.di_size
, &ar
);
434 gfs2_consist_inode(ip
);
442 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
443 * @sdp: the filesystem
448 int gfs2_make_fs_rw(struct gfs2_sbd
*sdp
)
450 struct gfs2_inode
*ip
= GFS2_I(sdp
->sd_jdesc
->jd_inode
);
451 struct gfs2_glock
*j_gl
= ip
->i_gl
;
452 struct gfs2_holder t_gh
;
453 struct gfs2_log_header head
;
456 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
,
457 GL_LOCAL_EXCL
, &t_gh
);
461 gfs2_meta_cache_flush(ip
);
462 j_gl
->gl_ops
->go_inval(j_gl
, DIO_METADATA
| DIO_DATA
);
464 error
= gfs2_find_jhead(sdp
->sd_jdesc
, &head
);
468 if (!(head
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
474 /* Initialize some head of the log stuff */
475 sdp
->sd_log_sequence
= head
.lh_sequence
+ 1;
476 gfs2_log_pointers_init(sdp
, head
.lh_blkno
);
478 error
= gfs2_quota_init(sdp
);
482 set_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
484 gfs2_glock_dq_uninit(&t_gh
);
491 t_gh
.gh_flags
|= GL_NOCACHE
;
492 gfs2_glock_dq_uninit(&t_gh
);
498 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
499 * @sdp: the filesystem
504 int gfs2_make_fs_ro(struct gfs2_sbd
*sdp
)
506 struct gfs2_holder t_gh
;
509 gfs2_quota_sync(sdp
);
510 gfs2_statfs_sync(sdp
);
512 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
,
513 GL_LOCAL_EXCL
| GL_NOCACHE
,
515 if (error
&& !test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
))
518 gfs2_meta_syncfs(sdp
);
519 gfs2_log_shutdown(sdp
);
521 clear_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
524 gfs2_glock_dq_uninit(&t_gh
);
526 gfs2_quota_cleanup(sdp
);
531 int gfs2_statfs_init(struct gfs2_sbd
*sdp
)
533 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_statfs_inode
);
534 struct gfs2_statfs_change
*m_sc
= &sdp
->sd_statfs_master
;
535 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
536 struct gfs2_statfs_change
*l_sc
= &sdp
->sd_statfs_local
;
537 struct buffer_head
*m_bh
, *l_bh
;
538 struct gfs2_holder gh
;
541 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
546 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
550 if (sdp
->sd_args
.ar_spectator
) {
551 spin_lock(&sdp
->sd_statfs_spin
);
552 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
553 sizeof(struct gfs2_dinode
));
554 spin_unlock(&sdp
->sd_statfs_spin
);
556 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
560 spin_lock(&sdp
->sd_statfs_spin
);
561 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
562 sizeof(struct gfs2_dinode
));
563 gfs2_statfs_change_in(l_sc
, l_bh
->b_data
+
564 sizeof(struct gfs2_dinode
));
565 spin_unlock(&sdp
->sd_statfs_spin
);
574 gfs2_glock_dq_uninit(&gh
);
579 void gfs2_statfs_change(struct gfs2_sbd
*sdp
, int64_t total
, int64_t free
,
582 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
583 struct gfs2_statfs_change
*l_sc
= &sdp
->sd_statfs_local
;
584 struct buffer_head
*l_bh
;
587 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
591 mutex_lock(&sdp
->sd_statfs_mutex
);
592 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
593 mutex_unlock(&sdp
->sd_statfs_mutex
);
595 spin_lock(&sdp
->sd_statfs_spin
);
596 l_sc
->sc_total
+= total
;
597 l_sc
->sc_free
+= free
;
598 l_sc
->sc_dinodes
+= dinodes
;
599 gfs2_statfs_change_out(l_sc
, l_bh
->b_data
+
600 sizeof(struct gfs2_dinode
));
601 spin_unlock(&sdp
->sd_statfs_spin
);
606 int gfs2_statfs_sync(struct gfs2_sbd
*sdp
)
608 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_statfs_inode
);
609 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
610 struct gfs2_statfs_change
*m_sc
= &sdp
->sd_statfs_master
;
611 struct gfs2_statfs_change
*l_sc
= &sdp
->sd_statfs_local
;
612 struct gfs2_holder gh
;
613 struct buffer_head
*m_bh
, *l_bh
;
616 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
621 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
625 spin_lock(&sdp
->sd_statfs_spin
);
626 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
627 sizeof(struct gfs2_dinode
));
628 if (!l_sc
->sc_total
&& !l_sc
->sc_free
&& !l_sc
->sc_dinodes
) {
629 spin_unlock(&sdp
->sd_statfs_spin
);
632 spin_unlock(&sdp
->sd_statfs_spin
);
634 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
638 error
= gfs2_trans_begin(sdp
, 2 * RES_DINODE
, 0);
642 mutex_lock(&sdp
->sd_statfs_mutex
);
643 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
644 mutex_unlock(&sdp
->sd_statfs_mutex
);
646 spin_lock(&sdp
->sd_statfs_spin
);
647 m_sc
->sc_total
+= l_sc
->sc_total
;
648 m_sc
->sc_free
+= l_sc
->sc_free
;
649 m_sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
650 memset(l_sc
, 0, sizeof(struct gfs2_statfs_change
));
651 memset(l_bh
->b_data
+ sizeof(struct gfs2_dinode
),
652 0, sizeof(struct gfs2_statfs_change
));
653 spin_unlock(&sdp
->sd_statfs_spin
);
655 gfs2_trans_add_bh(m_ip
->i_gl
, m_bh
, 1);
656 gfs2_statfs_change_out(m_sc
, m_bh
->b_data
+ sizeof(struct gfs2_dinode
));
667 gfs2_glock_dq_uninit(&gh
);
673 * gfs2_statfs_i - Do a statfs
674 * @sdp: the filesystem
675 * @sg: the sg structure
680 int gfs2_statfs_i(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change
*sc
)
682 struct gfs2_statfs_change
*m_sc
= &sdp
->sd_statfs_master
;
683 struct gfs2_statfs_change
*l_sc
= &sdp
->sd_statfs_local
;
685 spin_lock(&sdp
->sd_statfs_spin
);
688 sc
->sc_total
+= l_sc
->sc_total
;
689 sc
->sc_free
+= l_sc
->sc_free
;
690 sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
692 spin_unlock(&sdp
->sd_statfs_spin
);
696 if (sc
->sc_free
> sc
->sc_total
)
697 sc
->sc_free
= sc
->sc_total
;
698 if (sc
->sc_dinodes
< 0)
705 * statfs_fill - fill in the sg for a given RG
707 * @sc: the sc structure
709 * Returns: 0 on success, -ESTALE if the LVB is invalid
712 static int statfs_slow_fill(struct gfs2_rgrpd
*rgd
,
713 struct gfs2_statfs_change
*sc
)
715 gfs2_rgrp_verify(rgd
);
716 sc
->sc_total
+= rgd
->rd_ri
.ri_data
;
717 sc
->sc_free
+= rgd
->rd_rg
.rg_free
;
718 sc
->sc_dinodes
+= rgd
->rd_rg
.rg_dinodes
;
723 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
724 * @sdp: the filesystem
725 * @sc: the sc info that will be returned
727 * Any error (other than a signal) will cause this routine to fall back
728 * to the synchronous version.
730 * FIXME: This really shouldn't busy wait like this.
735 int gfs2_statfs_slow(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change
*sc
)
737 struct gfs2_holder ri_gh
;
738 struct gfs2_rgrpd
*rgd_next
;
739 struct gfs2_holder
*gha
, *gh
;
740 unsigned int slots
= 64;
745 memset(sc
, 0, sizeof(struct gfs2_statfs_change
));
746 gha
= kcalloc(slots
, sizeof(struct gfs2_holder
), GFP_KERNEL
);
750 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
754 rgd_next
= gfs2_rgrpd_get_first(sdp
);
759 for (x
= 0; x
< slots
; x
++) {
762 if (gh
->gh_gl
&& gfs2_glock_poll(gh
)) {
763 err
= gfs2_glock_wait(gh
);
765 gfs2_holder_uninit(gh
);
769 error
= statfs_slow_fill(
770 gh
->gh_gl
->gl_object
, sc
);
771 gfs2_glock_dq_uninit(gh
);
777 else if (rgd_next
&& !error
) {
778 error
= gfs2_glock_nq_init(rgd_next
->rd_gl
,
782 rgd_next
= gfs2_rgrpd_get_next(rgd_next
);
786 if (signal_pending(current
))
787 error
= -ERESTARTSYS
;
796 gfs2_glock_dq_uninit(&ri_gh
);
805 struct list_head list
;
806 struct gfs2_holder gh
;
810 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
812 * @sdp: the file system
813 * @state: the state to put the transaction lock into
814 * @t_gh: the hold on the transaction lock
819 static int gfs2_lock_fs_check_clean(struct gfs2_sbd
*sdp
,
820 struct gfs2_holder
*t_gh
)
822 struct gfs2_inode
*ip
;
823 struct gfs2_holder ji_gh
;
824 struct gfs2_jdesc
*jd
;
827 struct gfs2_log_header lh
;
830 error
= gfs2_jindex_hold(sdp
, &ji_gh
);
834 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
835 lfcc
= kmalloc(sizeof(struct lfcc
), GFP_KERNEL
);
840 ip
= GFS2_I(jd
->jd_inode
);
841 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, 0, &lfcc
->gh
);
846 list_add(&lfcc
->list
, &list
);
849 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_DEFERRED
,
850 LM_FLAG_PRIORITY
| GL_NOCACHE
,
853 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
854 error
= gfs2_jdesc_check(jd
);
857 error
= gfs2_find_jhead(jd
, &lh
);
860 if (!(lh
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
867 gfs2_glock_dq_uninit(t_gh
);
870 while (!list_empty(&list
)) {
871 lfcc
= list_entry(list
.next
, struct lfcc
, list
);
872 list_del(&lfcc
->list
);
873 gfs2_glock_dq_uninit(&lfcc
->gh
);
876 gfs2_glock_dq_uninit(&ji_gh
);
882 * gfs2_freeze_fs - freezes the file system
883 * @sdp: the file system
885 * This function flushes data and meta data for all machines by
886 * aquiring the transaction log exclusively. All journals are
887 * ensured to be in a clean state as well.
892 int gfs2_freeze_fs(struct gfs2_sbd
*sdp
)
896 mutex_lock(&sdp
->sd_freeze_lock
);
898 if (!sdp
->sd_freeze_count
++) {
899 error
= gfs2_lock_fs_check_clean(sdp
, &sdp
->sd_freeze_gh
);
901 sdp
->sd_freeze_count
--;
904 mutex_unlock(&sdp
->sd_freeze_lock
);
910 * gfs2_unfreeze_fs - unfreezes the file system
911 * @sdp: the file system
913 * This function allows the file system to proceed by unlocking
914 * the exclusively held transaction lock. Other GFS2 nodes are
915 * now free to acquire the lock shared and go on with their lives.
919 void gfs2_unfreeze_fs(struct gfs2_sbd
*sdp
)
921 mutex_lock(&sdp
->sd_freeze_lock
);
923 if (sdp
->sd_freeze_count
&& !--sdp
->sd_freeze_count
)
924 gfs2_glock_dq_uninit(&sdp
->sd_freeze_gh
);
926 mutex_unlock(&sdp
->sd_freeze_lock
);