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_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_host
*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 static int end_bio_io_page(struct bio
*bio
, unsigned int bytes_done
, int error
)
166 struct page
*page
= bio
->bi_private
;
171 SetPageUptodate(page
);
173 printk(KERN_WARNING
"gfs2: error %d reading superblock\n", error
);
179 * gfs2_read_super - Read the gfs2 super block from disk
180 * @sb: The VFS super block
181 * @sector: The location of the super block
183 * This uses the bio functions to read the super block from disk
184 * because we want to be 100% sure that we never read cached data.
185 * A super block is read twice only during each GFS2 mount and is
186 * never written to by the filesystem. The first time its read no
187 * locks are held, and the only details which are looked at are those
188 * relating to the locking protocol. Once locking is up and working,
189 * the sb is read again under the lock to establish the location of
190 * the master directory (contains pointers to journals etc) and the
193 * Returns: A page containing the sb or NULL
196 struct page
*gfs2_read_super(struct super_block
*sb
, sector_t sector
)
201 page
= alloc_page(GFP_KERNEL
);
205 ClearPageUptodate(page
);
206 ClearPageDirty(page
);
209 bio
= bio_alloc(GFP_KERNEL
, 1);
210 if (unlikely(!bio
)) {
215 bio
->bi_sector
= sector
* (sb
->s_blocksize
>> 9);
216 bio
->bi_bdev
= sb
->s_bdev
;
217 bio_add_page(bio
, page
, PAGE_SIZE
, 0);
219 bio
->bi_end_io
= end_bio_io_page
;
220 bio
->bi_private
= page
;
221 submit_bio(READ_SYNC
| (1 << BIO_RW_META
), bio
);
222 wait_on_page_locked(page
);
224 if (!PageUptodate(page
)) {
232 * gfs2_read_sb - Read super block
233 * @sdp: The GFS2 superblock
234 * @gl: the glock for the superblock (assumed to be held)
235 * @silent: Don't print message if mount fails
239 int gfs2_read_sb(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
, int silent
)
241 u32 hash_blocks
, ind_blocks
, leaf_blocks
;
248 page
= gfs2_read_super(sdp
->sd_vfs
, GFS2_SB_ADDR
>> sdp
->sd_fsb2bb_shift
);
251 fs_err(sdp
, "can't read superblock\n");
255 gfs2_sb_in(&sdp
->sd_sb
, sb
);
259 error
= gfs2_check_sb(sdp
, &sdp
->sd_sb
, silent
);
263 sdp
->sd_fsb2bb_shift
= sdp
->sd_sb
.sb_bsize_shift
-
264 GFS2_BASIC_BLOCK_SHIFT
;
265 sdp
->sd_fsb2bb
= 1 << sdp
->sd_fsb2bb_shift
;
266 sdp
->sd_diptrs
= (sdp
->sd_sb
.sb_bsize
-
267 sizeof(struct gfs2_dinode
)) / sizeof(u64
);
268 sdp
->sd_inptrs
= (sdp
->sd_sb
.sb_bsize
-
269 sizeof(struct gfs2_meta_header
)) / sizeof(u64
);
270 sdp
->sd_jbsize
= sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_meta_header
);
271 sdp
->sd_hash_bsize
= sdp
->sd_sb
.sb_bsize
/ 2;
272 sdp
->sd_hash_bsize_shift
= sdp
->sd_sb
.sb_bsize_shift
- 1;
273 sdp
->sd_hash_ptrs
= sdp
->sd_hash_bsize
/ sizeof(u64
);
274 sdp
->sd_qc_per_block
= (sdp
->sd_sb
.sb_bsize
-
275 sizeof(struct gfs2_meta_header
)) /
276 sizeof(struct gfs2_quota_change
);
278 /* Compute maximum reservation required to add a entry to a directory */
280 hash_blocks
= DIV_ROUND_UP(sizeof(u64
) * (1 << GFS2_DIR_MAX_DEPTH
),
284 for (tmp_blocks
= hash_blocks
; tmp_blocks
> sdp
->sd_diptrs
;) {
285 tmp_blocks
= DIV_ROUND_UP(tmp_blocks
, sdp
->sd_inptrs
);
286 ind_blocks
+= tmp_blocks
;
289 leaf_blocks
= 2 + GFS2_DIR_MAX_DEPTH
;
291 sdp
->sd_max_dirres
= hash_blocks
+ ind_blocks
+ leaf_blocks
;
293 sdp
->sd_heightsize
[0] = sdp
->sd_sb
.sb_bsize
-
294 sizeof(struct gfs2_dinode
);
295 sdp
->sd_heightsize
[1] = sdp
->sd_sb
.sb_bsize
* sdp
->sd_diptrs
;
300 space
= sdp
->sd_heightsize
[x
- 1] * sdp
->sd_inptrs
;
302 m
= do_div(d
, sdp
->sd_inptrs
);
304 if (d
!= sdp
->sd_heightsize
[x
- 1] || m
)
306 sdp
->sd_heightsize
[x
] = space
;
308 sdp
->sd_max_height
= x
;
309 gfs2_assert(sdp
, sdp
->sd_max_height
<= GFS2_MAX_META_HEIGHT
);
311 sdp
->sd_jheightsize
[0] = sdp
->sd_sb
.sb_bsize
-
312 sizeof(struct gfs2_dinode
);
313 sdp
->sd_jheightsize
[1] = sdp
->sd_jbsize
* sdp
->sd_diptrs
;
318 space
= sdp
->sd_jheightsize
[x
- 1] * sdp
->sd_inptrs
;
320 m
= do_div(d
, sdp
->sd_inptrs
);
322 if (d
!= sdp
->sd_jheightsize
[x
- 1] || m
)
324 sdp
->sd_jheightsize
[x
] = space
;
326 sdp
->sd_max_jheight
= x
;
327 gfs2_assert(sdp
, sdp
->sd_max_jheight
<= GFS2_MAX_META_HEIGHT
);
333 * gfs2_jindex_hold - Grab a lock on the jindex
334 * @sdp: The GFS2 superblock
335 * @ji_gh: the holder for the jindex glock
337 * This is very similar to the gfs2_rindex_hold() function, except that
338 * in general we hold the jindex lock for longer periods of time and
339 * we grab it far less frequently (in general) then the rgrp lock.
344 int gfs2_jindex_hold(struct gfs2_sbd
*sdp
, struct gfs2_holder
*ji_gh
)
346 struct gfs2_inode
*dip
= GFS2_I(sdp
->sd_jindex
);
349 struct gfs2_jdesc
*jd
;
354 mutex_lock(&sdp
->sd_jindex_mutex
);
357 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
, 0, ji_gh
);
361 name
.len
= sprintf(buf
, "journal%u", sdp
->sd_journals
);
362 name
.hash
= gfs2_disk_hash(name
.name
, name
.len
);
364 error
= gfs2_dir_search(sdp
->sd_jindex
, &name
, NULL
, NULL
);
365 if (error
== -ENOENT
) {
370 gfs2_glock_dq_uninit(ji_gh
);
376 jd
= kzalloc(sizeof(struct gfs2_jdesc
), GFP_KERNEL
);
380 jd
->jd_inode
= gfs2_lookupi(sdp
->sd_jindex
, &name
, 1, NULL
);
381 if (!jd
->jd_inode
|| IS_ERR(jd
->jd_inode
)) {
385 error
= PTR_ERR(jd
->jd_inode
);
390 spin_lock(&sdp
->sd_jindex_spin
);
391 jd
->jd_jid
= sdp
->sd_journals
++;
392 list_add_tail(&jd
->jd_list
, &sdp
->sd_jindex_list
);
393 spin_unlock(&sdp
->sd_jindex_spin
);
396 mutex_unlock(&sdp
->sd_jindex_mutex
);
402 * gfs2_jindex_free - Clear all the journal index information
403 * @sdp: The GFS2 superblock
407 void gfs2_jindex_free(struct gfs2_sbd
*sdp
)
409 struct list_head list
;
410 struct gfs2_jdesc
*jd
;
412 spin_lock(&sdp
->sd_jindex_spin
);
413 list_add(&list
, &sdp
->sd_jindex_list
);
414 list_del_init(&sdp
->sd_jindex_list
);
415 sdp
->sd_journals
= 0;
416 spin_unlock(&sdp
->sd_jindex_spin
);
418 while (!list_empty(&list
)) {
419 jd
= list_entry(list
.next
, struct gfs2_jdesc
, jd_list
);
420 list_del(&jd
->jd_list
);
426 static struct gfs2_jdesc
*jdesc_find_i(struct list_head
*head
, unsigned int jid
)
428 struct gfs2_jdesc
*jd
;
431 list_for_each_entry(jd
, head
, jd_list
) {
432 if (jd
->jd_jid
== jid
) {
444 struct gfs2_jdesc
*gfs2_jdesc_find(struct gfs2_sbd
*sdp
, unsigned int jid
)
446 struct gfs2_jdesc
*jd
;
448 spin_lock(&sdp
->sd_jindex_spin
);
449 jd
= jdesc_find_i(&sdp
->sd_jindex_list
, jid
);
450 spin_unlock(&sdp
->sd_jindex_spin
);
455 void gfs2_jdesc_make_dirty(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
);
463 spin_unlock(&sdp
->sd_jindex_spin
);
466 struct gfs2_jdesc
*gfs2_jdesc_find_dirty(struct gfs2_sbd
*sdp
)
468 struct gfs2_jdesc
*jd
;
471 spin_lock(&sdp
->sd_jindex_spin
);
473 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
480 spin_unlock(&sdp
->sd_jindex_spin
);
488 int gfs2_jdesc_check(struct gfs2_jdesc
*jd
)
490 struct gfs2_inode
*ip
= GFS2_I(jd
->jd_inode
);
491 struct gfs2_sbd
*sdp
= GFS2_SB(jd
->jd_inode
);
495 if (ip
->i_di
.di_size
< (8 << 20) || ip
->i_di
.di_size
> (1 << 30) ||
496 (ip
->i_di
.di_size
& (sdp
->sd_sb
.sb_bsize
- 1))) {
497 gfs2_consist_inode(ip
);
500 jd
->jd_blocks
= ip
->i_di
.di_size
>> sdp
->sd_sb
.sb_bsize_shift
;
502 error
= gfs2_write_alloc_required(ip
, 0, ip
->i_di
.di_size
, &ar
);
504 gfs2_consist_inode(ip
);
512 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
513 * @sdp: the filesystem
518 int gfs2_make_fs_rw(struct gfs2_sbd
*sdp
)
520 struct gfs2_inode
*ip
= GFS2_I(sdp
->sd_jdesc
->jd_inode
);
521 struct gfs2_glock
*j_gl
= ip
->i_gl
;
522 struct gfs2_holder t_gh
;
523 struct gfs2_log_header_host head
;
526 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
, 0, &t_gh
);
530 gfs2_meta_cache_flush(ip
);
531 j_gl
->gl_ops
->go_inval(j_gl
, DIO_METADATA
);
533 error
= gfs2_find_jhead(sdp
->sd_jdesc
, &head
);
537 if (!(head
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
543 /* Initialize some head of the log stuff */
544 sdp
->sd_log_sequence
= head
.lh_sequence
+ 1;
545 gfs2_log_pointers_init(sdp
, head
.lh_blkno
);
547 error
= gfs2_quota_init(sdp
);
551 set_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
553 gfs2_glock_dq_uninit(&t_gh
);
558 t_gh
.gh_flags
|= GL_NOCACHE
;
559 gfs2_glock_dq_uninit(&t_gh
);
565 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
566 * @sdp: the filesystem
571 int gfs2_make_fs_ro(struct gfs2_sbd
*sdp
)
573 struct gfs2_holder t_gh
;
576 gfs2_quota_sync(sdp
);
577 gfs2_statfs_sync(sdp
);
579 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
, GL_NOCACHE
,
581 if (error
&& !test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
))
584 gfs2_meta_syncfs(sdp
);
585 gfs2_log_shutdown(sdp
);
587 clear_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
590 gfs2_glock_dq_uninit(&t_gh
);
592 gfs2_quota_cleanup(sdp
);
597 int gfs2_statfs_init(struct gfs2_sbd
*sdp
)
599 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_statfs_inode
);
600 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
601 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
602 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
603 struct buffer_head
*m_bh
, *l_bh
;
604 struct gfs2_holder gh
;
607 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
612 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
616 if (sdp
->sd_args
.ar_spectator
) {
617 spin_lock(&sdp
->sd_statfs_spin
);
618 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
619 sizeof(struct gfs2_dinode
));
620 spin_unlock(&sdp
->sd_statfs_spin
);
622 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
626 spin_lock(&sdp
->sd_statfs_spin
);
627 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
628 sizeof(struct gfs2_dinode
));
629 gfs2_statfs_change_in(l_sc
, l_bh
->b_data
+
630 sizeof(struct gfs2_dinode
));
631 spin_unlock(&sdp
->sd_statfs_spin
);
639 gfs2_glock_dq_uninit(&gh
);
643 void gfs2_statfs_change(struct gfs2_sbd
*sdp
, s64 total
, s64 free
,
646 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
647 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
648 struct buffer_head
*l_bh
;
651 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
655 mutex_lock(&sdp
->sd_statfs_mutex
);
656 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
657 mutex_unlock(&sdp
->sd_statfs_mutex
);
659 spin_lock(&sdp
->sd_statfs_spin
);
660 l_sc
->sc_total
+= total
;
661 l_sc
->sc_free
+= free
;
662 l_sc
->sc_dinodes
+= dinodes
;
663 gfs2_statfs_change_out(l_sc
, l_bh
->b_data
+ sizeof(struct gfs2_dinode
));
664 spin_unlock(&sdp
->sd_statfs_spin
);
669 int gfs2_statfs_sync(struct gfs2_sbd
*sdp
)
671 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_statfs_inode
);
672 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
673 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
674 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
675 struct gfs2_holder gh
;
676 struct buffer_head
*m_bh
, *l_bh
;
679 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
684 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
688 spin_lock(&sdp
->sd_statfs_spin
);
689 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
690 sizeof(struct gfs2_dinode
));
691 if (!l_sc
->sc_total
&& !l_sc
->sc_free
&& !l_sc
->sc_dinodes
) {
692 spin_unlock(&sdp
->sd_statfs_spin
);
695 spin_unlock(&sdp
->sd_statfs_spin
);
697 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
701 error
= gfs2_trans_begin(sdp
, 2 * RES_DINODE
, 0);
705 mutex_lock(&sdp
->sd_statfs_mutex
);
706 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
707 mutex_unlock(&sdp
->sd_statfs_mutex
);
709 spin_lock(&sdp
->sd_statfs_spin
);
710 m_sc
->sc_total
+= l_sc
->sc_total
;
711 m_sc
->sc_free
+= l_sc
->sc_free
;
712 m_sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
713 memset(l_sc
, 0, sizeof(struct gfs2_statfs_change
));
714 memset(l_bh
->b_data
+ sizeof(struct gfs2_dinode
),
715 0, sizeof(struct gfs2_statfs_change
));
716 spin_unlock(&sdp
->sd_statfs_spin
);
718 gfs2_trans_add_bh(m_ip
->i_gl
, m_bh
, 1);
719 gfs2_statfs_change_out(m_sc
, m_bh
->b_data
+ sizeof(struct gfs2_dinode
));
728 gfs2_glock_dq_uninit(&gh
);
733 * gfs2_statfs_i - Do a statfs
734 * @sdp: the filesystem
735 * @sg: the sg structure
740 int gfs2_statfs_i(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change_host
*sc
)
742 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
743 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
745 spin_lock(&sdp
->sd_statfs_spin
);
748 sc
->sc_total
+= l_sc
->sc_total
;
749 sc
->sc_free
+= l_sc
->sc_free
;
750 sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
752 spin_unlock(&sdp
->sd_statfs_spin
);
756 if (sc
->sc_free
> sc
->sc_total
)
757 sc
->sc_free
= sc
->sc_total
;
758 if (sc
->sc_dinodes
< 0)
765 * statfs_fill - fill in the sg for a given RG
767 * @sc: the sc structure
769 * Returns: 0 on success, -ESTALE if the LVB is invalid
772 static int statfs_slow_fill(struct gfs2_rgrpd
*rgd
,
773 struct gfs2_statfs_change_host
*sc
)
775 gfs2_rgrp_verify(rgd
);
776 sc
->sc_total
+= rgd
->rd_ri
.ri_data
;
777 sc
->sc_free
+= rgd
->rd_rg
.rg_free
;
778 sc
->sc_dinodes
+= rgd
->rd_rg
.rg_dinodes
;
783 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
784 * @sdp: the filesystem
785 * @sc: the sc info that will be returned
787 * Any error (other than a signal) will cause this routine to fall back
788 * to the synchronous version.
790 * FIXME: This really shouldn't busy wait like this.
795 int gfs2_statfs_slow(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change_host
*sc
)
797 struct gfs2_holder ri_gh
;
798 struct gfs2_rgrpd
*rgd_next
;
799 struct gfs2_holder
*gha
, *gh
;
800 unsigned int slots
= 64;
805 memset(sc
, 0, sizeof(struct gfs2_statfs_change_host
));
806 gha
= kcalloc(slots
, sizeof(struct gfs2_holder
), GFP_KERNEL
);
810 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
814 rgd_next
= gfs2_rgrpd_get_first(sdp
);
819 for (x
= 0; x
< slots
; x
++) {
822 if (gh
->gh_gl
&& gfs2_glock_poll(gh
)) {
823 err
= gfs2_glock_wait(gh
);
825 gfs2_holder_uninit(gh
);
829 error
= statfs_slow_fill(
830 gh
->gh_gl
->gl_object
, sc
);
831 gfs2_glock_dq_uninit(gh
);
837 else if (rgd_next
&& !error
) {
838 error
= gfs2_glock_nq_init(rgd_next
->rd_gl
,
842 rgd_next
= gfs2_rgrpd_get_next(rgd_next
);
846 if (signal_pending(current
))
847 error
= -ERESTARTSYS
;
856 gfs2_glock_dq_uninit(&ri_gh
);
864 struct list_head list
;
865 struct gfs2_holder gh
;
869 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
871 * @sdp: the file system
872 * @state: the state to put the transaction lock into
873 * @t_gh: the hold on the transaction lock
878 static int gfs2_lock_fs_check_clean(struct gfs2_sbd
*sdp
,
879 struct gfs2_holder
*t_gh
)
881 struct gfs2_inode
*ip
;
882 struct gfs2_holder ji_gh
;
883 struct gfs2_jdesc
*jd
;
886 struct gfs2_log_header_host lh
;
889 error
= gfs2_jindex_hold(sdp
, &ji_gh
);
893 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
894 lfcc
= kmalloc(sizeof(struct lfcc
), GFP_KERNEL
);
899 ip
= GFS2_I(jd
->jd_inode
);
900 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, 0, &lfcc
->gh
);
905 list_add(&lfcc
->list
, &list
);
908 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_DEFERRED
,
909 LM_FLAG_PRIORITY
| GL_NOCACHE
,
912 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
913 error
= gfs2_jdesc_check(jd
);
916 error
= gfs2_find_jhead(jd
, &lh
);
919 if (!(lh
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
926 gfs2_glock_dq_uninit(t_gh
);
929 while (!list_empty(&list
)) {
930 lfcc
= list_entry(list
.next
, struct lfcc
, list
);
931 list_del(&lfcc
->list
);
932 gfs2_glock_dq_uninit(&lfcc
->gh
);
935 gfs2_glock_dq_uninit(&ji_gh
);
940 * gfs2_freeze_fs - freezes the file system
941 * @sdp: the file system
943 * This function flushes data and meta data for all machines by
944 * aquiring the transaction log exclusively. All journals are
945 * ensured to be in a clean state as well.
950 int gfs2_freeze_fs(struct gfs2_sbd
*sdp
)
954 mutex_lock(&sdp
->sd_freeze_lock
);
956 if (!sdp
->sd_freeze_count
++) {
957 error
= gfs2_lock_fs_check_clean(sdp
, &sdp
->sd_freeze_gh
);
959 sdp
->sd_freeze_count
--;
962 mutex_unlock(&sdp
->sd_freeze_lock
);
968 * gfs2_unfreeze_fs - unfreezes the file system
969 * @sdp: the file system
971 * This function allows the file system to proceed by unlocking
972 * the exclusively held transaction lock. Other GFS2 nodes are
973 * now free to acquire the lock shared and go on with their lives.
977 void gfs2_unfreeze_fs(struct gfs2_sbd
*sdp
)
979 mutex_lock(&sdp
->sd_freeze_lock
);
981 if (sdp
->sd_freeze_count
&& !--sdp
->sd_freeze_count
)
982 gfs2_glock_dq_uninit(&sdp
->sd_freeze_gh
);
984 mutex_unlock(&sdp
->sd_freeze_lock
);