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
);
55 gt
->gt_ilimit_tries
= 3;
56 gt
->gt_ilimit_min
= 1;
57 gt
->gt_demote_secs
= 300;
58 gt
->gt_incore_log_blocks
= 1024;
59 gt
->gt_log_flush_secs
= 60;
60 gt
->gt_jindex_refresh_secs
= 60;
61 gt
->gt_scand_secs
= 15;
62 gt
->gt_recoverd_secs
= 60;
64 gt
->gt_quotad_secs
= 5;
65 gt
->gt_quota_simul_sync
= 64;
66 gt
->gt_quota_warn_period
= 10;
67 gt
->gt_quota_scale_num
= 1;
68 gt
->gt_quota_scale_den
= 1;
69 gt
->gt_quota_cache_secs
= 300;
70 gt
->gt_quota_quantum
= 60;
71 gt
->gt_atime_quantum
= 3600;
72 gt
->gt_new_files_jdata
= 0;
73 gt
->gt_new_files_directio
= 0;
74 gt
->gt_max_readahead
= 1 << 18;
75 gt
->gt_lockdump_size
= 131072;
76 gt
->gt_stall_secs
= 600;
77 gt
->gt_complain_secs
= 10;
78 gt
->gt_reclaim_limit
= 5000;
79 gt
->gt_entries_per_readdir
= 32;
80 gt
->gt_greedy_default
= HZ
/ 10;
81 gt
->gt_greedy_quantum
= HZ
/ 40;
82 gt
->gt_greedy_max
= HZ
/ 4;
83 gt
->gt_statfs_quantum
= 30;
84 gt
->gt_statfs_slow
= 0;
88 * gfs2_check_sb - Check superblock
89 * @sdp: the filesystem
91 * @silent: Don't print a message if the check fails
93 * Checks the version code of the FS is one that we understand how to
94 * read and that the sizes of the various on-disk structures have not
98 int gfs2_check_sb(struct gfs2_sbd
*sdp
, struct gfs2_sb_host
*sb
, int silent
)
102 if (sb
->sb_header
.mh_magic
!= GFS2_MAGIC
||
103 sb
->sb_header
.mh_type
!= GFS2_METATYPE_SB
) {
105 printk(KERN_WARNING
"GFS2: not a GFS2 filesystem\n");
109 /* If format numbers match exactly, we're done. */
111 if (sb
->sb_fs_format
== GFS2_FORMAT_FS
&&
112 sb
->sb_multihost_format
== GFS2_FORMAT_MULTI
)
115 if (sb
->sb_fs_format
!= GFS2_FORMAT_FS
) {
116 for (x
= 0; gfs2_old_fs_formats
[x
]; x
++)
117 if (gfs2_old_fs_formats
[x
] == sb
->sb_fs_format
)
120 if (!gfs2_old_fs_formats
[x
]) {
122 "GFS2: code version (%u, %u) is incompatible "
123 "with ondisk format (%u, %u)\n",
124 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
125 sb
->sb_fs_format
, sb
->sb_multihost_format
);
127 "GFS2: I don't know how to upgrade this FS\n");
132 if (sb
->sb_multihost_format
!= GFS2_FORMAT_MULTI
) {
133 for (x
= 0; gfs2_old_multihost_formats
[x
]; x
++)
134 if (gfs2_old_multihost_formats
[x
] ==
135 sb
->sb_multihost_format
)
138 if (!gfs2_old_multihost_formats
[x
]) {
140 "GFS2: code version (%u, %u) is incompatible "
141 "with ondisk format (%u, %u)\n",
142 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
143 sb
->sb_fs_format
, sb
->sb_multihost_format
);
145 "GFS2: I don't know how to upgrade this FS\n");
150 if (!sdp
->sd_args
.ar_upgrade
) {
152 "GFS2: code version (%u, %u) is incompatible "
153 "with ondisk format (%u, %u)\n",
154 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
155 sb
->sb_fs_format
, sb
->sb_multihost_format
);
157 "GFS2: Use the \"upgrade\" mount option to upgrade "
159 printk(KERN_INFO
"GFS2: See the manual for more details\n");
167 static int end_bio_io_page(struct bio
*bio
, unsigned int bytes_done
, int error
)
169 struct page
*page
= bio
->bi_private
;
174 SetPageUptodate(page
);
176 printk(KERN_WARNING
"gfs2: error %d reading superblock\n", error
);
182 * gfs2_read_super - Read the gfs2 super block from disk
183 * @sb: The VFS super block
184 * @sector: The location of the super block
186 * This uses the bio functions to read the super block from disk
187 * because we want to be 100% sure that we never read cached data.
188 * A super block is read twice only during each GFS2 mount and is
189 * never written to by the filesystem. The first time its read no
190 * locks are held, and the only details which are looked at are those
191 * relating to the locking protocol. Once locking is up and working,
192 * the sb is read again under the lock to establish the location of
193 * the master directory (contains pointers to journals etc) and the
196 * Returns: A page containing the sb or NULL
199 struct page
*gfs2_read_super(struct super_block
*sb
, sector_t sector
)
204 page
= alloc_page(GFP_KERNEL
);
208 ClearPageUptodate(page
);
209 ClearPageDirty(page
);
212 bio
= bio_alloc(GFP_KERNEL
, 1);
213 if (unlikely(!bio
)) {
218 bio
->bi_sector
= sector
* (sb
->s_blocksize
>> 9);
219 bio
->bi_bdev
= sb
->s_bdev
;
220 bio_add_page(bio
, page
, PAGE_SIZE
, 0);
222 bio
->bi_end_io
= end_bio_io_page
;
223 bio
->bi_private
= page
;
224 submit_bio(READ_SYNC
| (1 << BIO_RW_META
), bio
);
225 wait_on_page_locked(page
);
227 if (!PageUptodate(page
)) {
235 * gfs2_read_sb - Read super block
236 * @sdp: The GFS2 superblock
237 * @gl: the glock for the superblock (assumed to be held)
238 * @silent: Don't print message if mount fails
242 int gfs2_read_sb(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
, int silent
)
244 u32 hash_blocks
, ind_blocks
, leaf_blocks
;
251 page
= gfs2_read_super(sdp
->sd_vfs
, GFS2_SB_ADDR
>> sdp
->sd_fsb2bb_shift
);
254 fs_err(sdp
, "can't read superblock\n");
258 gfs2_sb_in(&sdp
->sd_sb
, sb
);
262 error
= gfs2_check_sb(sdp
, &sdp
->sd_sb
, silent
);
266 sdp
->sd_fsb2bb_shift
= sdp
->sd_sb
.sb_bsize_shift
-
267 GFS2_BASIC_BLOCK_SHIFT
;
268 sdp
->sd_fsb2bb
= 1 << sdp
->sd_fsb2bb_shift
;
269 sdp
->sd_diptrs
= (sdp
->sd_sb
.sb_bsize
-
270 sizeof(struct gfs2_dinode
)) / sizeof(u64
);
271 sdp
->sd_inptrs
= (sdp
->sd_sb
.sb_bsize
-
272 sizeof(struct gfs2_meta_header
)) / sizeof(u64
);
273 sdp
->sd_jbsize
= sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_meta_header
);
274 sdp
->sd_hash_bsize
= sdp
->sd_sb
.sb_bsize
/ 2;
275 sdp
->sd_hash_bsize_shift
= sdp
->sd_sb
.sb_bsize_shift
- 1;
276 sdp
->sd_hash_ptrs
= sdp
->sd_hash_bsize
/ sizeof(u64
);
277 sdp
->sd_qc_per_block
= (sdp
->sd_sb
.sb_bsize
-
278 sizeof(struct gfs2_meta_header
)) /
279 sizeof(struct gfs2_quota_change
);
281 /* Compute maximum reservation required to add a entry to a directory */
283 hash_blocks
= DIV_ROUND_UP(sizeof(u64
) * (1 << GFS2_DIR_MAX_DEPTH
),
287 for (tmp_blocks
= hash_blocks
; tmp_blocks
> sdp
->sd_diptrs
;) {
288 tmp_blocks
= DIV_ROUND_UP(tmp_blocks
, sdp
->sd_inptrs
);
289 ind_blocks
+= tmp_blocks
;
292 leaf_blocks
= 2 + GFS2_DIR_MAX_DEPTH
;
294 sdp
->sd_max_dirres
= hash_blocks
+ ind_blocks
+ leaf_blocks
;
296 sdp
->sd_heightsize
[0] = sdp
->sd_sb
.sb_bsize
-
297 sizeof(struct gfs2_dinode
);
298 sdp
->sd_heightsize
[1] = sdp
->sd_sb
.sb_bsize
* sdp
->sd_diptrs
;
303 space
= sdp
->sd_heightsize
[x
- 1] * sdp
->sd_inptrs
;
305 m
= do_div(d
, sdp
->sd_inptrs
);
307 if (d
!= sdp
->sd_heightsize
[x
- 1] || m
)
309 sdp
->sd_heightsize
[x
] = space
;
311 sdp
->sd_max_height
= x
;
312 gfs2_assert(sdp
, sdp
->sd_max_height
<= GFS2_MAX_META_HEIGHT
);
314 sdp
->sd_jheightsize
[0] = sdp
->sd_sb
.sb_bsize
-
315 sizeof(struct gfs2_dinode
);
316 sdp
->sd_jheightsize
[1] = sdp
->sd_jbsize
* sdp
->sd_diptrs
;
321 space
= sdp
->sd_jheightsize
[x
- 1] * sdp
->sd_inptrs
;
323 m
= do_div(d
, sdp
->sd_inptrs
);
325 if (d
!= sdp
->sd_jheightsize
[x
- 1] || m
)
327 sdp
->sd_jheightsize
[x
] = space
;
329 sdp
->sd_max_jheight
= x
;
330 gfs2_assert(sdp
, sdp
->sd_max_jheight
<= GFS2_MAX_META_HEIGHT
);
336 * gfs2_jindex_hold - Grab a lock on the jindex
337 * @sdp: The GFS2 superblock
338 * @ji_gh: the holder for the jindex glock
340 * This is very similar to the gfs2_rindex_hold() function, except that
341 * in general we hold the jindex lock for longer periods of time and
342 * we grab it far less frequently (in general) then the rgrp lock.
347 int gfs2_jindex_hold(struct gfs2_sbd
*sdp
, struct gfs2_holder
*ji_gh
)
349 struct gfs2_inode
*dip
= GFS2_I(sdp
->sd_jindex
);
352 struct gfs2_jdesc
*jd
;
357 mutex_lock(&sdp
->sd_jindex_mutex
);
360 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
,
361 GL_LOCAL_EXCL
, ji_gh
);
365 name
.len
= sprintf(buf
, "journal%u", sdp
->sd_journals
);
366 name
.hash
= gfs2_disk_hash(name
.name
, name
.len
);
368 error
= gfs2_dir_search(sdp
->sd_jindex
, &name
, NULL
, NULL
);
369 if (error
== -ENOENT
) {
374 gfs2_glock_dq_uninit(ji_gh
);
380 jd
= kzalloc(sizeof(struct gfs2_jdesc
), GFP_KERNEL
);
384 jd
->jd_inode
= gfs2_lookupi(sdp
->sd_jindex
, &name
, 1, NULL
);
385 if (!jd
->jd_inode
|| IS_ERR(jd
->jd_inode
)) {
389 error
= PTR_ERR(jd
->jd_inode
);
394 spin_lock(&sdp
->sd_jindex_spin
);
395 jd
->jd_jid
= sdp
->sd_journals
++;
396 list_add_tail(&jd
->jd_list
, &sdp
->sd_jindex_list
);
397 spin_unlock(&sdp
->sd_jindex_spin
);
400 mutex_unlock(&sdp
->sd_jindex_mutex
);
406 * gfs2_jindex_free - Clear all the journal index information
407 * @sdp: The GFS2 superblock
411 void gfs2_jindex_free(struct gfs2_sbd
*sdp
)
413 struct list_head list
;
414 struct gfs2_jdesc
*jd
;
416 spin_lock(&sdp
->sd_jindex_spin
);
417 list_add(&list
, &sdp
->sd_jindex_list
);
418 list_del_init(&sdp
->sd_jindex_list
);
419 sdp
->sd_journals
= 0;
420 spin_unlock(&sdp
->sd_jindex_spin
);
422 while (!list_empty(&list
)) {
423 jd
= list_entry(list
.next
, struct gfs2_jdesc
, jd_list
);
424 list_del(&jd
->jd_list
);
430 static struct gfs2_jdesc
*jdesc_find_i(struct list_head
*head
, unsigned int jid
)
432 struct gfs2_jdesc
*jd
;
435 list_for_each_entry(jd
, head
, jd_list
) {
436 if (jd
->jd_jid
== jid
) {
448 struct gfs2_jdesc
*gfs2_jdesc_find(struct gfs2_sbd
*sdp
, unsigned int jid
)
450 struct gfs2_jdesc
*jd
;
452 spin_lock(&sdp
->sd_jindex_spin
);
453 jd
= jdesc_find_i(&sdp
->sd_jindex_list
, jid
);
454 spin_unlock(&sdp
->sd_jindex_spin
);
459 void gfs2_jdesc_make_dirty(struct gfs2_sbd
*sdp
, unsigned int jid
)
461 struct gfs2_jdesc
*jd
;
463 spin_lock(&sdp
->sd_jindex_spin
);
464 jd
= jdesc_find_i(&sdp
->sd_jindex_list
, jid
);
467 spin_unlock(&sdp
->sd_jindex_spin
);
470 struct gfs2_jdesc
*gfs2_jdesc_find_dirty(struct gfs2_sbd
*sdp
)
472 struct gfs2_jdesc
*jd
;
475 spin_lock(&sdp
->sd_jindex_spin
);
477 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
484 spin_unlock(&sdp
->sd_jindex_spin
);
492 int gfs2_jdesc_check(struct gfs2_jdesc
*jd
)
494 struct gfs2_inode
*ip
= GFS2_I(jd
->jd_inode
);
495 struct gfs2_sbd
*sdp
= GFS2_SB(jd
->jd_inode
);
499 if (ip
->i_di
.di_size
< (8 << 20) || ip
->i_di
.di_size
> (1 << 30) ||
500 (ip
->i_di
.di_size
& (sdp
->sd_sb
.sb_bsize
- 1))) {
501 gfs2_consist_inode(ip
);
504 jd
->jd_blocks
= ip
->i_di
.di_size
>> sdp
->sd_sb
.sb_bsize_shift
;
506 error
= gfs2_write_alloc_required(ip
, 0, ip
->i_di
.di_size
, &ar
);
508 gfs2_consist_inode(ip
);
516 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
517 * @sdp: the filesystem
522 int gfs2_make_fs_rw(struct gfs2_sbd
*sdp
)
524 struct gfs2_inode
*ip
= GFS2_I(sdp
->sd_jdesc
->jd_inode
);
525 struct gfs2_glock
*j_gl
= ip
->i_gl
;
526 struct gfs2_holder t_gh
;
527 struct gfs2_log_header_host head
;
530 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
,
531 GL_LOCAL_EXCL
, &t_gh
);
535 gfs2_meta_cache_flush(ip
);
536 j_gl
->gl_ops
->go_inval(j_gl
, DIO_METADATA
);
538 error
= gfs2_find_jhead(sdp
->sd_jdesc
, &head
);
542 if (!(head
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
548 /* Initialize some head of the log stuff */
549 sdp
->sd_log_sequence
= head
.lh_sequence
+ 1;
550 gfs2_log_pointers_init(sdp
, head
.lh_blkno
);
552 error
= gfs2_quota_init(sdp
);
556 set_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
558 gfs2_glock_dq_uninit(&t_gh
);
563 t_gh
.gh_flags
|= GL_NOCACHE
;
564 gfs2_glock_dq_uninit(&t_gh
);
570 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
571 * @sdp: the filesystem
576 int gfs2_make_fs_ro(struct gfs2_sbd
*sdp
)
578 struct gfs2_holder t_gh
;
581 gfs2_quota_sync(sdp
);
582 gfs2_statfs_sync(sdp
);
584 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
,
585 GL_LOCAL_EXCL
| GL_NOCACHE
,
587 if (error
&& !test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
))
590 gfs2_meta_syncfs(sdp
);
591 gfs2_log_shutdown(sdp
);
593 clear_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
596 gfs2_glock_dq_uninit(&t_gh
);
598 gfs2_quota_cleanup(sdp
);
603 int gfs2_statfs_init(struct gfs2_sbd
*sdp
)
605 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_statfs_inode
);
606 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
607 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
608 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
609 struct buffer_head
*m_bh
, *l_bh
;
610 struct gfs2_holder gh
;
613 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
618 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
622 if (sdp
->sd_args
.ar_spectator
) {
623 spin_lock(&sdp
->sd_statfs_spin
);
624 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
625 sizeof(struct gfs2_dinode
));
626 spin_unlock(&sdp
->sd_statfs_spin
);
628 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
632 spin_lock(&sdp
->sd_statfs_spin
);
633 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
634 sizeof(struct gfs2_dinode
));
635 gfs2_statfs_change_in(l_sc
, l_bh
->b_data
+
636 sizeof(struct gfs2_dinode
));
637 spin_unlock(&sdp
->sd_statfs_spin
);
645 gfs2_glock_dq_uninit(&gh
);
649 void gfs2_statfs_change(struct gfs2_sbd
*sdp
, s64 total
, s64 free
,
652 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
653 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
654 struct buffer_head
*l_bh
;
657 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
661 mutex_lock(&sdp
->sd_statfs_mutex
);
662 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
663 mutex_unlock(&sdp
->sd_statfs_mutex
);
665 spin_lock(&sdp
->sd_statfs_spin
);
666 l_sc
->sc_total
+= total
;
667 l_sc
->sc_free
+= free
;
668 l_sc
->sc_dinodes
+= dinodes
;
669 gfs2_statfs_change_out(l_sc
, l_bh
->b_data
+ sizeof(struct gfs2_dinode
));
670 spin_unlock(&sdp
->sd_statfs_spin
);
675 int gfs2_statfs_sync(struct gfs2_sbd
*sdp
)
677 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_statfs_inode
);
678 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
679 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
680 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
681 struct gfs2_holder gh
;
682 struct buffer_head
*m_bh
, *l_bh
;
685 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
690 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
694 spin_lock(&sdp
->sd_statfs_spin
);
695 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
696 sizeof(struct gfs2_dinode
));
697 if (!l_sc
->sc_total
&& !l_sc
->sc_free
&& !l_sc
->sc_dinodes
) {
698 spin_unlock(&sdp
->sd_statfs_spin
);
701 spin_unlock(&sdp
->sd_statfs_spin
);
703 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
707 error
= gfs2_trans_begin(sdp
, 2 * RES_DINODE
, 0);
711 mutex_lock(&sdp
->sd_statfs_mutex
);
712 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
713 mutex_unlock(&sdp
->sd_statfs_mutex
);
715 spin_lock(&sdp
->sd_statfs_spin
);
716 m_sc
->sc_total
+= l_sc
->sc_total
;
717 m_sc
->sc_free
+= l_sc
->sc_free
;
718 m_sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
719 memset(l_sc
, 0, sizeof(struct gfs2_statfs_change
));
720 memset(l_bh
->b_data
+ sizeof(struct gfs2_dinode
),
721 0, sizeof(struct gfs2_statfs_change
));
722 spin_unlock(&sdp
->sd_statfs_spin
);
724 gfs2_trans_add_bh(m_ip
->i_gl
, m_bh
, 1);
725 gfs2_statfs_change_out(m_sc
, m_bh
->b_data
+ sizeof(struct gfs2_dinode
));
734 gfs2_glock_dq_uninit(&gh
);
739 * gfs2_statfs_i - Do a statfs
740 * @sdp: the filesystem
741 * @sg: the sg structure
746 int gfs2_statfs_i(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change_host
*sc
)
748 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
749 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
751 spin_lock(&sdp
->sd_statfs_spin
);
754 sc
->sc_total
+= l_sc
->sc_total
;
755 sc
->sc_free
+= l_sc
->sc_free
;
756 sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
758 spin_unlock(&sdp
->sd_statfs_spin
);
762 if (sc
->sc_free
> sc
->sc_total
)
763 sc
->sc_free
= sc
->sc_total
;
764 if (sc
->sc_dinodes
< 0)
771 * statfs_fill - fill in the sg for a given RG
773 * @sc: the sc structure
775 * Returns: 0 on success, -ESTALE if the LVB is invalid
778 static int statfs_slow_fill(struct gfs2_rgrpd
*rgd
,
779 struct gfs2_statfs_change_host
*sc
)
781 gfs2_rgrp_verify(rgd
);
782 sc
->sc_total
+= rgd
->rd_ri
.ri_data
;
783 sc
->sc_free
+= rgd
->rd_rg
.rg_free
;
784 sc
->sc_dinodes
+= rgd
->rd_rg
.rg_dinodes
;
789 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
790 * @sdp: the filesystem
791 * @sc: the sc info that will be returned
793 * Any error (other than a signal) will cause this routine to fall back
794 * to the synchronous version.
796 * FIXME: This really shouldn't busy wait like this.
801 int gfs2_statfs_slow(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change_host
*sc
)
803 struct gfs2_holder ri_gh
;
804 struct gfs2_rgrpd
*rgd_next
;
805 struct gfs2_holder
*gha
, *gh
;
806 unsigned int slots
= 64;
811 memset(sc
, 0, sizeof(struct gfs2_statfs_change_host
));
812 gha
= kcalloc(slots
, sizeof(struct gfs2_holder
), GFP_KERNEL
);
816 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
820 rgd_next
= gfs2_rgrpd_get_first(sdp
);
825 for (x
= 0; x
< slots
; x
++) {
828 if (gh
->gh_gl
&& gfs2_glock_poll(gh
)) {
829 err
= gfs2_glock_wait(gh
);
831 gfs2_holder_uninit(gh
);
835 error
= statfs_slow_fill(
836 gh
->gh_gl
->gl_object
, sc
);
837 gfs2_glock_dq_uninit(gh
);
843 else if (rgd_next
&& !error
) {
844 error
= gfs2_glock_nq_init(rgd_next
->rd_gl
,
848 rgd_next
= gfs2_rgrpd_get_next(rgd_next
);
852 if (signal_pending(current
))
853 error
= -ERESTARTSYS
;
862 gfs2_glock_dq_uninit(&ri_gh
);
870 struct list_head list
;
871 struct gfs2_holder gh
;
875 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
877 * @sdp: the file system
878 * @state: the state to put the transaction lock into
879 * @t_gh: the hold on the transaction lock
884 static int gfs2_lock_fs_check_clean(struct gfs2_sbd
*sdp
,
885 struct gfs2_holder
*t_gh
)
887 struct gfs2_inode
*ip
;
888 struct gfs2_holder ji_gh
;
889 struct gfs2_jdesc
*jd
;
892 struct gfs2_log_header_host lh
;
895 error
= gfs2_jindex_hold(sdp
, &ji_gh
);
899 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
900 lfcc
= kmalloc(sizeof(struct lfcc
), GFP_KERNEL
);
905 ip
= GFS2_I(jd
->jd_inode
);
906 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, 0, &lfcc
->gh
);
911 list_add(&lfcc
->list
, &list
);
914 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_DEFERRED
,
915 LM_FLAG_PRIORITY
| GL_NOCACHE
,
918 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
919 error
= gfs2_jdesc_check(jd
);
922 error
= gfs2_find_jhead(jd
, &lh
);
925 if (!(lh
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
932 gfs2_glock_dq_uninit(t_gh
);
935 while (!list_empty(&list
)) {
936 lfcc
= list_entry(list
.next
, struct lfcc
, list
);
937 list_del(&lfcc
->list
);
938 gfs2_glock_dq_uninit(&lfcc
->gh
);
941 gfs2_glock_dq_uninit(&ji_gh
);
946 * gfs2_freeze_fs - freezes the file system
947 * @sdp: the file system
949 * This function flushes data and meta data for all machines by
950 * aquiring the transaction log exclusively. All journals are
951 * ensured to be in a clean state as well.
956 int gfs2_freeze_fs(struct gfs2_sbd
*sdp
)
960 mutex_lock(&sdp
->sd_freeze_lock
);
962 if (!sdp
->sd_freeze_count
++) {
963 error
= gfs2_lock_fs_check_clean(sdp
, &sdp
->sd_freeze_gh
);
965 sdp
->sd_freeze_count
--;
968 mutex_unlock(&sdp
->sd_freeze_lock
);
974 * gfs2_unfreeze_fs - unfreezes the file system
975 * @sdp: the file system
977 * This function allows the file system to proceed by unlocking
978 * the exclusively held transaction lock. Other GFS2 nodes are
979 * now free to acquire the lock shared and go on with their lives.
983 void gfs2_unfreeze_fs(struct gfs2_sbd
*sdp
)
985 mutex_lock(&sdp
->sd_freeze_lock
);
987 if (sdp
->sd_freeze_count
&& !--sdp
->sd_freeze_count
)
988 gfs2_glock_dq_uninit(&sdp
->sd_freeze_gh
);
990 mutex_unlock(&sdp
->sd_freeze_lock
);