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_reclaim_limit
= 5000;
74 gt
->gt_statfs_quantum
= 30;
75 gt
->gt_statfs_slow
= 0;
79 * gfs2_check_sb - Check superblock
80 * @sdp: the filesystem
82 * @silent: Don't print a message if the check fails
84 * Checks the version code of the FS is one that we understand how to
85 * read and that the sizes of the various on-disk structures have not
89 int gfs2_check_sb(struct gfs2_sbd
*sdp
, struct gfs2_sb_host
*sb
, int silent
)
93 if (sb
->sb_magic
!= GFS2_MAGIC
||
94 sb
->sb_type
!= GFS2_METATYPE_SB
) {
96 printk(KERN_WARNING
"GFS2: not a GFS2 filesystem\n");
100 /* If format numbers match exactly, we're done. */
102 if (sb
->sb_fs_format
== GFS2_FORMAT_FS
&&
103 sb
->sb_multihost_format
== GFS2_FORMAT_MULTI
)
106 if (sb
->sb_fs_format
!= GFS2_FORMAT_FS
) {
107 for (x
= 0; gfs2_old_fs_formats
[x
]; x
++)
108 if (gfs2_old_fs_formats
[x
] == sb
->sb_fs_format
)
111 if (!gfs2_old_fs_formats
[x
]) {
113 "GFS2: code version (%u, %u) is incompatible "
114 "with ondisk format (%u, %u)\n",
115 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
116 sb
->sb_fs_format
, sb
->sb_multihost_format
);
118 "GFS2: I don't know how to upgrade this FS\n");
123 if (sb
->sb_multihost_format
!= GFS2_FORMAT_MULTI
) {
124 for (x
= 0; gfs2_old_multihost_formats
[x
]; x
++)
125 if (gfs2_old_multihost_formats
[x
] ==
126 sb
->sb_multihost_format
)
129 if (!gfs2_old_multihost_formats
[x
]) {
131 "GFS2: code version (%u, %u) is incompatible "
132 "with ondisk format (%u, %u)\n",
133 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
134 sb
->sb_fs_format
, sb
->sb_multihost_format
);
136 "GFS2: I don't know how to upgrade this FS\n");
141 if (!sdp
->sd_args
.ar_upgrade
) {
143 "GFS2: code version (%u, %u) is incompatible "
144 "with ondisk format (%u, %u)\n",
145 GFS2_FORMAT_FS
, GFS2_FORMAT_MULTI
,
146 sb
->sb_fs_format
, sb
->sb_multihost_format
);
148 "GFS2: Use the \"upgrade\" mount option to upgrade "
150 printk(KERN_INFO
"GFS2: See the manual for more details\n");
158 static void end_bio_io_page(struct bio
*bio
, int error
)
160 struct page
*page
= bio
->bi_private
;
163 SetPageUptodate(page
);
165 printk(KERN_WARNING
"gfs2: error %d reading superblock\n", error
);
169 static void gfs2_sb_in(struct gfs2_sb_host
*sb
, const void *buf
)
171 const struct gfs2_sb
*str
= buf
;
173 sb
->sb_magic
= be32_to_cpu(str
->sb_header
.mh_magic
);
174 sb
->sb_type
= be32_to_cpu(str
->sb_header
.mh_type
);
175 sb
->sb_format
= be32_to_cpu(str
->sb_header
.mh_format
);
176 sb
->sb_fs_format
= be32_to_cpu(str
->sb_fs_format
);
177 sb
->sb_multihost_format
= be32_to_cpu(str
->sb_multihost_format
);
178 sb
->sb_bsize
= be32_to_cpu(str
->sb_bsize
);
179 sb
->sb_bsize_shift
= be32_to_cpu(str
->sb_bsize_shift
);
180 sb
->sb_master_dir
.no_addr
= be64_to_cpu(str
->sb_master_dir
.no_addr
);
181 sb
->sb_master_dir
.no_formal_ino
= be64_to_cpu(str
->sb_master_dir
.no_formal_ino
);
182 sb
->sb_root_dir
.no_addr
= be64_to_cpu(str
->sb_root_dir
.no_addr
);
183 sb
->sb_root_dir
.no_formal_ino
= be64_to_cpu(str
->sb_root_dir
.no_formal_ino
);
185 memcpy(sb
->sb_lockproto
, str
->sb_lockproto
, GFS2_LOCKNAME_LEN
);
186 memcpy(sb
->sb_locktable
, str
->sb_locktable
, GFS2_LOCKNAME_LEN
);
190 * gfs2_read_super - Read the gfs2 super block from disk
191 * @sdp: The GFS2 super block
192 * @sector: The location of the super block
193 * @error: The error code to return
195 * This uses the bio functions to read the super block from disk
196 * because we want to be 100% sure that we never read cached data.
197 * A super block is read twice only during each GFS2 mount and is
198 * never written to by the filesystem. The first time its read no
199 * locks are held, and the only details which are looked at are those
200 * relating to the locking protocol. Once locking is up and working,
201 * the sb is read again under the lock to establish the location of
202 * the master directory (contains pointers to journals etc) and the
205 * Returns: 0 on success or error
208 int gfs2_read_super(struct gfs2_sbd
*sdp
, sector_t sector
)
210 struct super_block
*sb
= sdp
->sd_vfs
;
215 page
= alloc_page(GFP_KERNEL
);
219 ClearPageUptodate(page
);
220 ClearPageDirty(page
);
223 bio
= bio_alloc(GFP_KERNEL
, 1);
224 if (unlikely(!bio
)) {
229 bio
->bi_sector
= sector
* (sb
->s_blocksize
>> 9);
230 bio
->bi_bdev
= sb
->s_bdev
;
231 bio_add_page(bio
, page
, PAGE_SIZE
, 0);
233 bio
->bi_end_io
= end_bio_io_page
;
234 bio
->bi_private
= page
;
235 submit_bio(READ_SYNC
| (1 << BIO_RW_META
), bio
);
236 wait_on_page_locked(page
);
238 if (!PageUptodate(page
)) {
243 gfs2_sb_in(&sdp
->sd_sb
, p
);
250 * gfs2_read_sb - Read super block
251 * @sdp: The GFS2 superblock
252 * @gl: the glock for the superblock (assumed to be held)
253 * @silent: Don't print message if mount fails
257 int gfs2_read_sb(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
, int silent
)
259 u32 hash_blocks
, ind_blocks
, leaf_blocks
;
264 error
= gfs2_read_super(sdp
, GFS2_SB_ADDR
>> sdp
->sd_fsb2bb_shift
);
267 fs_err(sdp
, "can't read superblock\n");
271 error
= gfs2_check_sb(sdp
, &sdp
->sd_sb
, silent
);
275 sdp
->sd_fsb2bb_shift
= sdp
->sd_sb
.sb_bsize_shift
-
276 GFS2_BASIC_BLOCK_SHIFT
;
277 sdp
->sd_fsb2bb
= 1 << sdp
->sd_fsb2bb_shift
;
278 sdp
->sd_diptrs
= (sdp
->sd_sb
.sb_bsize
-
279 sizeof(struct gfs2_dinode
)) / sizeof(u64
);
280 sdp
->sd_inptrs
= (sdp
->sd_sb
.sb_bsize
-
281 sizeof(struct gfs2_meta_header
)) / sizeof(u64
);
282 sdp
->sd_jbsize
= sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_meta_header
);
283 sdp
->sd_hash_bsize
= sdp
->sd_sb
.sb_bsize
/ 2;
284 sdp
->sd_hash_bsize_shift
= sdp
->sd_sb
.sb_bsize_shift
- 1;
285 sdp
->sd_hash_ptrs
= sdp
->sd_hash_bsize
/ sizeof(u64
);
286 sdp
->sd_qc_per_block
= (sdp
->sd_sb
.sb_bsize
-
287 sizeof(struct gfs2_meta_header
)) /
288 sizeof(struct gfs2_quota_change
);
290 /* Compute maximum reservation required to add a entry to a directory */
292 hash_blocks
= DIV_ROUND_UP(sizeof(u64
) * (1 << GFS2_DIR_MAX_DEPTH
),
296 for (tmp_blocks
= hash_blocks
; tmp_blocks
> sdp
->sd_diptrs
;) {
297 tmp_blocks
= DIV_ROUND_UP(tmp_blocks
, sdp
->sd_inptrs
);
298 ind_blocks
+= tmp_blocks
;
301 leaf_blocks
= 2 + GFS2_DIR_MAX_DEPTH
;
303 sdp
->sd_max_dirres
= hash_blocks
+ ind_blocks
+ leaf_blocks
;
305 sdp
->sd_heightsize
[0] = sdp
->sd_sb
.sb_bsize
-
306 sizeof(struct gfs2_dinode
);
307 sdp
->sd_heightsize
[1] = sdp
->sd_sb
.sb_bsize
* sdp
->sd_diptrs
;
312 space
= sdp
->sd_heightsize
[x
- 1] * sdp
->sd_inptrs
;
314 m
= do_div(d
, sdp
->sd_inptrs
);
316 if (d
!= sdp
->sd_heightsize
[x
- 1] || m
)
318 sdp
->sd_heightsize
[x
] = space
;
320 sdp
->sd_max_height
= x
;
321 gfs2_assert(sdp
, sdp
->sd_max_height
<= GFS2_MAX_META_HEIGHT
);
323 sdp
->sd_jheightsize
[0] = sdp
->sd_sb
.sb_bsize
-
324 sizeof(struct gfs2_dinode
);
325 sdp
->sd_jheightsize
[1] = sdp
->sd_jbsize
* sdp
->sd_diptrs
;
330 space
= sdp
->sd_jheightsize
[x
- 1] * sdp
->sd_inptrs
;
332 m
= do_div(d
, sdp
->sd_inptrs
);
334 if (d
!= sdp
->sd_jheightsize
[x
- 1] || m
)
336 sdp
->sd_jheightsize
[x
] = space
;
338 sdp
->sd_max_jheight
= x
;
339 gfs2_assert(sdp
, sdp
->sd_max_jheight
<= GFS2_MAX_META_HEIGHT
);
345 * gfs2_jindex_hold - Grab a lock on the jindex
346 * @sdp: The GFS2 superblock
347 * @ji_gh: the holder for the jindex glock
349 * This is very similar to the gfs2_rindex_hold() function, except that
350 * in general we hold the jindex lock for longer periods of time and
351 * we grab it far less frequently (in general) then the rgrp lock.
356 int gfs2_jindex_hold(struct gfs2_sbd
*sdp
, struct gfs2_holder
*ji_gh
)
358 struct gfs2_inode
*dip
= GFS2_I(sdp
->sd_jindex
);
361 struct gfs2_jdesc
*jd
;
366 mutex_lock(&sdp
->sd_jindex_mutex
);
369 error
= gfs2_glock_nq_init(dip
->i_gl
, LM_ST_SHARED
, 0, ji_gh
);
373 name
.len
= sprintf(buf
, "journal%u", sdp
->sd_journals
);
374 name
.hash
= gfs2_disk_hash(name
.name
, name
.len
);
376 error
= gfs2_dir_check(sdp
->sd_jindex
, &name
, NULL
);
377 if (error
== -ENOENT
) {
382 gfs2_glock_dq_uninit(ji_gh
);
388 jd
= kzalloc(sizeof(struct gfs2_jdesc
), GFP_KERNEL
);
392 jd
->jd_inode
= gfs2_lookupi(sdp
->sd_jindex
, &name
, 1, NULL
);
393 if (!jd
->jd_inode
|| IS_ERR(jd
->jd_inode
)) {
397 error
= PTR_ERR(jd
->jd_inode
);
402 spin_lock(&sdp
->sd_jindex_spin
);
403 jd
->jd_jid
= sdp
->sd_journals
++;
404 list_add_tail(&jd
->jd_list
, &sdp
->sd_jindex_list
);
405 spin_unlock(&sdp
->sd_jindex_spin
);
408 mutex_unlock(&sdp
->sd_jindex_mutex
);
414 * gfs2_jindex_free - Clear all the journal index information
415 * @sdp: The GFS2 superblock
419 void gfs2_jindex_free(struct gfs2_sbd
*sdp
)
421 struct list_head list
;
422 struct gfs2_jdesc
*jd
;
424 spin_lock(&sdp
->sd_jindex_spin
);
425 list_add(&list
, &sdp
->sd_jindex_list
);
426 list_del_init(&sdp
->sd_jindex_list
);
427 sdp
->sd_journals
= 0;
428 spin_unlock(&sdp
->sd_jindex_spin
);
430 while (!list_empty(&list
)) {
431 jd
= list_entry(list
.next
, struct gfs2_jdesc
, jd_list
);
432 list_del(&jd
->jd_list
);
438 static struct gfs2_jdesc
*jdesc_find_i(struct list_head
*head
, unsigned int jid
)
440 struct gfs2_jdesc
*jd
;
443 list_for_each_entry(jd
, head
, jd_list
) {
444 if (jd
->jd_jid
== jid
) {
456 struct gfs2_jdesc
*gfs2_jdesc_find(struct gfs2_sbd
*sdp
, unsigned int jid
)
458 struct gfs2_jdesc
*jd
;
460 spin_lock(&sdp
->sd_jindex_spin
);
461 jd
= jdesc_find_i(&sdp
->sd_jindex_list
, jid
);
462 spin_unlock(&sdp
->sd_jindex_spin
);
467 void gfs2_jdesc_make_dirty(struct gfs2_sbd
*sdp
, unsigned int jid
)
469 struct gfs2_jdesc
*jd
;
471 spin_lock(&sdp
->sd_jindex_spin
);
472 jd
= jdesc_find_i(&sdp
->sd_jindex_list
, jid
);
475 spin_unlock(&sdp
->sd_jindex_spin
);
478 struct gfs2_jdesc
*gfs2_jdesc_find_dirty(struct gfs2_sbd
*sdp
)
480 struct gfs2_jdesc
*jd
;
483 spin_lock(&sdp
->sd_jindex_spin
);
485 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
492 spin_unlock(&sdp
->sd_jindex_spin
);
500 int gfs2_jdesc_check(struct gfs2_jdesc
*jd
)
502 struct gfs2_inode
*ip
= GFS2_I(jd
->jd_inode
);
503 struct gfs2_sbd
*sdp
= GFS2_SB(jd
->jd_inode
);
507 if (ip
->i_di
.di_size
< (8 << 20) || ip
->i_di
.di_size
> (1 << 30) ||
508 (ip
->i_di
.di_size
& (sdp
->sd_sb
.sb_bsize
- 1))) {
509 gfs2_consist_inode(ip
);
512 jd
->jd_blocks
= ip
->i_di
.di_size
>> sdp
->sd_sb
.sb_bsize_shift
;
514 error
= gfs2_write_alloc_required(ip
, 0, ip
->i_di
.di_size
, &ar
);
516 gfs2_consist_inode(ip
);
524 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
525 * @sdp: the filesystem
530 int gfs2_make_fs_rw(struct gfs2_sbd
*sdp
)
532 struct gfs2_inode
*ip
= GFS2_I(sdp
->sd_jdesc
->jd_inode
);
533 struct gfs2_glock
*j_gl
= ip
->i_gl
;
534 struct gfs2_holder t_gh
;
535 struct gfs2_log_header_host head
;
538 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
, 0, &t_gh
);
542 j_gl
->gl_ops
->go_inval(j_gl
, DIO_METADATA
);
544 error
= gfs2_find_jhead(sdp
->sd_jdesc
, &head
);
548 if (!(head
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
554 /* Initialize some head of the log stuff */
555 sdp
->sd_log_sequence
= head
.lh_sequence
+ 1;
556 gfs2_log_pointers_init(sdp
, head
.lh_blkno
);
558 error
= gfs2_quota_init(sdp
);
562 set_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
564 gfs2_glock_dq_uninit(&t_gh
);
569 t_gh
.gh_flags
|= GL_NOCACHE
;
570 gfs2_glock_dq_uninit(&t_gh
);
576 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
577 * @sdp: the filesystem
582 int gfs2_make_fs_ro(struct gfs2_sbd
*sdp
)
584 struct gfs2_holder t_gh
;
587 gfs2_quota_sync(sdp
);
588 gfs2_statfs_sync(sdp
);
590 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
, GL_NOCACHE
,
592 if (error
&& !test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
))
595 gfs2_meta_syncfs(sdp
);
596 gfs2_log_shutdown(sdp
);
598 clear_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
601 gfs2_glock_dq_uninit(&t_gh
);
603 gfs2_quota_cleanup(sdp
);
608 static void gfs2_statfs_change_in(struct gfs2_statfs_change_host
*sc
, const void *buf
)
610 const struct gfs2_statfs_change
*str
= buf
;
612 sc
->sc_total
= be64_to_cpu(str
->sc_total
);
613 sc
->sc_free
= be64_to_cpu(str
->sc_free
);
614 sc
->sc_dinodes
= be64_to_cpu(str
->sc_dinodes
);
617 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host
*sc
, void *buf
)
619 struct gfs2_statfs_change
*str
= buf
;
621 str
->sc_total
= cpu_to_be64(sc
->sc_total
);
622 str
->sc_free
= cpu_to_be64(sc
->sc_free
);
623 str
->sc_dinodes
= cpu_to_be64(sc
->sc_dinodes
);
626 int gfs2_statfs_init(struct gfs2_sbd
*sdp
)
628 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_statfs_inode
);
629 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
630 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
631 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
632 struct buffer_head
*m_bh
, *l_bh
;
633 struct gfs2_holder gh
;
636 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
641 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
645 if (sdp
->sd_args
.ar_spectator
) {
646 spin_lock(&sdp
->sd_statfs_spin
);
647 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
648 sizeof(struct gfs2_dinode
));
649 spin_unlock(&sdp
->sd_statfs_spin
);
651 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
655 spin_lock(&sdp
->sd_statfs_spin
);
656 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
657 sizeof(struct gfs2_dinode
));
658 gfs2_statfs_change_in(l_sc
, l_bh
->b_data
+
659 sizeof(struct gfs2_dinode
));
660 spin_unlock(&sdp
->sd_statfs_spin
);
668 gfs2_glock_dq_uninit(&gh
);
672 void gfs2_statfs_change(struct gfs2_sbd
*sdp
, s64 total
, s64 free
,
675 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
676 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
677 struct buffer_head
*l_bh
;
680 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
684 mutex_lock(&sdp
->sd_statfs_mutex
);
685 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
686 mutex_unlock(&sdp
->sd_statfs_mutex
);
688 spin_lock(&sdp
->sd_statfs_spin
);
689 l_sc
->sc_total
+= total
;
690 l_sc
->sc_free
+= free
;
691 l_sc
->sc_dinodes
+= dinodes
;
692 gfs2_statfs_change_out(l_sc
, l_bh
->b_data
+ sizeof(struct gfs2_dinode
));
693 spin_unlock(&sdp
->sd_statfs_spin
);
698 int gfs2_statfs_sync(struct gfs2_sbd
*sdp
)
700 struct gfs2_inode
*m_ip
= GFS2_I(sdp
->sd_statfs_inode
);
701 struct gfs2_inode
*l_ip
= GFS2_I(sdp
->sd_sc_inode
);
702 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
703 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
704 struct gfs2_holder gh
;
705 struct buffer_head
*m_bh
, *l_bh
;
708 error
= gfs2_glock_nq_init(m_ip
->i_gl
, LM_ST_EXCLUSIVE
, GL_NOCACHE
,
713 error
= gfs2_meta_inode_buffer(m_ip
, &m_bh
);
717 spin_lock(&sdp
->sd_statfs_spin
);
718 gfs2_statfs_change_in(m_sc
, m_bh
->b_data
+
719 sizeof(struct gfs2_dinode
));
720 if (!l_sc
->sc_total
&& !l_sc
->sc_free
&& !l_sc
->sc_dinodes
) {
721 spin_unlock(&sdp
->sd_statfs_spin
);
724 spin_unlock(&sdp
->sd_statfs_spin
);
726 error
= gfs2_meta_inode_buffer(l_ip
, &l_bh
);
730 error
= gfs2_trans_begin(sdp
, 2 * RES_DINODE
, 0);
734 mutex_lock(&sdp
->sd_statfs_mutex
);
735 gfs2_trans_add_bh(l_ip
->i_gl
, l_bh
, 1);
736 mutex_unlock(&sdp
->sd_statfs_mutex
);
738 spin_lock(&sdp
->sd_statfs_spin
);
739 m_sc
->sc_total
+= l_sc
->sc_total
;
740 m_sc
->sc_free
+= l_sc
->sc_free
;
741 m_sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
742 memset(l_sc
, 0, sizeof(struct gfs2_statfs_change
));
743 memset(l_bh
->b_data
+ sizeof(struct gfs2_dinode
),
744 0, sizeof(struct gfs2_statfs_change
));
745 spin_unlock(&sdp
->sd_statfs_spin
);
747 gfs2_trans_add_bh(m_ip
->i_gl
, m_bh
, 1);
748 gfs2_statfs_change_out(m_sc
, m_bh
->b_data
+ sizeof(struct gfs2_dinode
));
757 gfs2_glock_dq_uninit(&gh
);
762 * gfs2_statfs_i - Do a statfs
763 * @sdp: the filesystem
764 * @sg: the sg structure
769 int gfs2_statfs_i(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change_host
*sc
)
771 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
772 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
774 spin_lock(&sdp
->sd_statfs_spin
);
777 sc
->sc_total
+= l_sc
->sc_total
;
778 sc
->sc_free
+= l_sc
->sc_free
;
779 sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
781 spin_unlock(&sdp
->sd_statfs_spin
);
785 if (sc
->sc_free
> sc
->sc_total
)
786 sc
->sc_free
= sc
->sc_total
;
787 if (sc
->sc_dinodes
< 0)
794 * statfs_fill - fill in the sg for a given RG
796 * @sc: the sc structure
798 * Returns: 0 on success, -ESTALE if the LVB is invalid
801 static int statfs_slow_fill(struct gfs2_rgrpd
*rgd
,
802 struct gfs2_statfs_change_host
*sc
)
804 gfs2_rgrp_verify(rgd
);
805 sc
->sc_total
+= rgd
->rd_data
;
806 sc
->sc_free
+= rgd
->rd_rg
.rg_free
;
807 sc
->sc_dinodes
+= rgd
->rd_rg
.rg_dinodes
;
812 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
813 * @sdp: the filesystem
814 * @sc: the sc info that will be returned
816 * Any error (other than a signal) will cause this routine to fall back
817 * to the synchronous version.
819 * FIXME: This really shouldn't busy wait like this.
824 int gfs2_statfs_slow(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change_host
*sc
)
826 struct gfs2_holder ri_gh
;
827 struct gfs2_rgrpd
*rgd_next
;
828 struct gfs2_holder
*gha
, *gh
;
829 unsigned int slots
= 64;
834 memset(sc
, 0, sizeof(struct gfs2_statfs_change_host
));
835 gha
= kcalloc(slots
, sizeof(struct gfs2_holder
), GFP_KERNEL
);
839 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
843 rgd_next
= gfs2_rgrpd_get_first(sdp
);
848 for (x
= 0; x
< slots
; x
++) {
851 if (gh
->gh_gl
&& gfs2_glock_poll(gh
)) {
852 err
= gfs2_glock_wait(gh
);
854 gfs2_holder_uninit(gh
);
858 error
= statfs_slow_fill(
859 gh
->gh_gl
->gl_object
, sc
);
860 gfs2_glock_dq_uninit(gh
);
866 else if (rgd_next
&& !error
) {
867 error
= gfs2_glock_nq_init(rgd_next
->rd_gl
,
871 rgd_next
= gfs2_rgrpd_get_next(rgd_next
);
875 if (signal_pending(current
))
876 error
= -ERESTARTSYS
;
885 gfs2_glock_dq_uninit(&ri_gh
);
893 struct list_head list
;
894 struct gfs2_holder gh
;
898 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
900 * @sdp: the file system
901 * @state: the state to put the transaction lock into
902 * @t_gh: the hold on the transaction lock
907 static int gfs2_lock_fs_check_clean(struct gfs2_sbd
*sdp
,
908 struct gfs2_holder
*t_gh
)
910 struct gfs2_inode
*ip
;
911 struct gfs2_holder ji_gh
;
912 struct gfs2_jdesc
*jd
;
915 struct gfs2_log_header_host lh
;
918 error
= gfs2_jindex_hold(sdp
, &ji_gh
);
922 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
923 lfcc
= kmalloc(sizeof(struct lfcc
), GFP_KERNEL
);
928 ip
= GFS2_I(jd
->jd_inode
);
929 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_SHARED
, 0, &lfcc
->gh
);
934 list_add(&lfcc
->list
, &list
);
937 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_DEFERRED
,
938 LM_FLAG_PRIORITY
| GL_NOCACHE
,
941 list_for_each_entry(jd
, &sdp
->sd_jindex_list
, jd_list
) {
942 error
= gfs2_jdesc_check(jd
);
945 error
= gfs2_find_jhead(jd
, &lh
);
948 if (!(lh
.lh_flags
& GFS2_LOG_HEAD_UNMOUNT
)) {
955 gfs2_glock_dq_uninit(t_gh
);
958 while (!list_empty(&list
)) {
959 lfcc
= list_entry(list
.next
, struct lfcc
, list
);
960 list_del(&lfcc
->list
);
961 gfs2_glock_dq_uninit(&lfcc
->gh
);
964 gfs2_glock_dq_uninit(&ji_gh
);
969 * gfs2_freeze_fs - freezes the file system
970 * @sdp: the file system
972 * This function flushes data and meta data for all machines by
973 * aquiring the transaction log exclusively. All journals are
974 * ensured to be in a clean state as well.
979 int gfs2_freeze_fs(struct gfs2_sbd
*sdp
)
983 mutex_lock(&sdp
->sd_freeze_lock
);
985 if (!sdp
->sd_freeze_count
++) {
986 error
= gfs2_lock_fs_check_clean(sdp
, &sdp
->sd_freeze_gh
);
988 sdp
->sd_freeze_count
--;
991 mutex_unlock(&sdp
->sd_freeze_lock
);
997 * gfs2_unfreeze_fs - unfreezes the file system
998 * @sdp: the file system
1000 * This function allows the file system to proceed by unlocking
1001 * the exclusively held transaction lock. Other GFS2 nodes are
1002 * now free to acquire the lock shared and go on with their lives.
1006 void gfs2_unfreeze_fs(struct gfs2_sbd
*sdp
)
1008 mutex_lock(&sdp
->sd_freeze_lock
);
1010 if (sdp
->sd_freeze_count
&& !--sdp
->sd_freeze_count
)
1011 gfs2_glock_dq_uninit(&sdp
->sd_freeze_gh
);
1013 mutex_unlock(&sdp
->sd_freeze_lock
);