2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 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/statfs.h>
16 #include <linux/seq_file.h>
17 #include <linux/mount.h>
18 #include <linux/kthread.h>
19 #include <linux/delay.h>
20 #include <linux/gfs2_ondisk.h>
21 #include <linux/crc32.h>
22 #include <linux/lm_interface.h>
23 #include <linux/time.h>
44 * gfs2_write_inode - Make sure the inode is stable on the disk
46 * @sync: synchronous write flag
51 static int gfs2_write_inode(struct inode
*inode
, int sync
)
53 struct gfs2_inode
*ip
= GFS2_I(inode
);
54 struct gfs2_sbd
*sdp
= GFS2_SB(inode
);
55 struct gfs2_holder gh
;
56 struct buffer_head
*bh
;
57 struct timespec atime
;
58 struct gfs2_dinode
*di
;
61 /* Check this is a "normal" inode, etc */
62 if (!test_bit(GIF_USER
, &ip
->i_flags
) ||
63 (current
->flags
& PF_MEMALLOC
))
65 ret
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &gh
);
68 ret
= gfs2_trans_begin(sdp
, RES_DINODE
, 0);
71 ret
= gfs2_meta_inode_buffer(ip
, &bh
);
73 di
= (struct gfs2_dinode
*)bh
->b_data
;
74 atime
.tv_sec
= be64_to_cpu(di
->di_atime
);
75 atime
.tv_nsec
= be32_to_cpu(di
->di_atime_nsec
);
76 if (timespec_compare(&inode
->i_atime
, &atime
) > 0) {
77 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
78 gfs2_dinode_out(ip
, bh
->b_data
);
84 gfs2_glock_dq_uninit(&gh
);
87 gfs2_log_flush(GFS2_SB(inode
), ip
->i_gl
);
92 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
93 * @sdp: the filesystem
98 static int gfs2_make_fs_ro(struct gfs2_sbd
*sdp
)
100 struct gfs2_holder t_gh
;
103 gfs2_quota_sync(sdp
);
104 gfs2_statfs_sync(sdp
);
106 error
= gfs2_glock_nq_init(sdp
->sd_trans_gl
, LM_ST_SHARED
, GL_NOCACHE
,
108 if (error
&& !test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
))
111 gfs2_meta_syncfs(sdp
);
112 gfs2_log_shutdown(sdp
);
114 clear_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
);
117 gfs2_glock_dq_uninit(&t_gh
);
119 gfs2_quota_cleanup(sdp
);
125 * gfs2_put_super - Unmount the filesystem
126 * @sb: The VFS superblock
130 static void gfs2_put_super(struct super_block
*sb
)
132 struct gfs2_sbd
*sdp
= sb
->s_fs_info
;
135 /* Unfreeze the filesystem, if we need to */
137 mutex_lock(&sdp
->sd_freeze_lock
);
138 if (sdp
->sd_freeze_count
)
139 gfs2_glock_dq_uninit(&sdp
->sd_freeze_gh
);
140 mutex_unlock(&sdp
->sd_freeze_lock
);
142 kthread_stop(sdp
->sd_quotad_process
);
143 kthread_stop(sdp
->sd_logd_process
);
144 kthread_stop(sdp
->sd_recoverd_process
);
146 if (!(sb
->s_flags
& MS_RDONLY
)) {
147 error
= gfs2_make_fs_ro(sdp
);
151 /* At this point, we're through modifying the disk */
155 iput(sdp
->sd_jindex
);
156 iput(sdp
->sd_inum_inode
);
157 iput(sdp
->sd_statfs_inode
);
158 iput(sdp
->sd_rindex
);
159 iput(sdp
->sd_quota_inode
);
161 gfs2_glock_put(sdp
->sd_rename_gl
);
162 gfs2_glock_put(sdp
->sd_trans_gl
);
164 if (!sdp
->sd_args
.ar_spectator
) {
165 gfs2_glock_dq_uninit(&sdp
->sd_journal_gh
);
166 gfs2_glock_dq_uninit(&sdp
->sd_jinode_gh
);
167 gfs2_glock_dq_uninit(&sdp
->sd_ir_gh
);
168 gfs2_glock_dq_uninit(&sdp
->sd_sc_gh
);
169 gfs2_glock_dq_uninit(&sdp
->sd_qc_gh
);
170 iput(sdp
->sd_ir_inode
);
171 iput(sdp
->sd_sc_inode
);
172 iput(sdp
->sd_qc_inode
);
175 gfs2_glock_dq_uninit(&sdp
->sd_live_gh
);
176 gfs2_clear_rgrpd(sdp
);
177 gfs2_jindex_free(sdp
);
178 /* Take apart glock structures and buffer lists */
179 gfs2_gl_hash_clear(sdp
);
180 /* Unmount the locking protocol */
181 gfs2_lm_unmount(sdp
);
183 /* At this point, we're through participating in the lockspace */
184 gfs2_sys_fs_del(sdp
);
190 * @sb: the superblock
194 static void gfs2_write_super(struct super_block
*sb
)
200 * gfs2_sync_fs - sync the filesystem
201 * @sb: the superblock
203 * Flushes the log to disk.
206 static int gfs2_sync_fs(struct super_block
*sb
, int wait
)
209 if (wait
&& sb
->s_fs_info
)
210 gfs2_log_flush(sb
->s_fs_info
, NULL
);
215 * gfs2_write_super_lockfs - prevent further writes to the filesystem
216 * @sb: the VFS structure for the filesystem
220 static void gfs2_write_super_lockfs(struct super_block
*sb
)
222 struct gfs2_sbd
*sdp
= sb
->s_fs_info
;
225 if (test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
))
229 error
= gfs2_freeze_fs(sdp
);
235 fs_err(sdp
, "waiting for recovery before freeze\n");
239 fs_err(sdp
, "error freezing FS: %d\n", error
);
243 fs_err(sdp
, "retrying...\n");
249 * gfs2_unlockfs - reallow writes to the filesystem
250 * @sb: the VFS structure for the filesystem
254 static void gfs2_unlockfs(struct super_block
*sb
)
256 gfs2_unfreeze_fs(sb
->s_fs_info
);
260 * statfs_fill - fill in the sg for a given RG
262 * @sc: the sc structure
264 * Returns: 0 on success, -ESTALE if the LVB is invalid
267 static int statfs_slow_fill(struct gfs2_rgrpd
*rgd
,
268 struct gfs2_statfs_change_host
*sc
)
270 gfs2_rgrp_verify(rgd
);
271 sc
->sc_total
+= rgd
->rd_data
;
272 sc
->sc_free
+= rgd
->rd_free
;
273 sc
->sc_dinodes
+= rgd
->rd_dinodes
;
278 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
279 * @sdp: the filesystem
280 * @sc: the sc info that will be returned
282 * Any error (other than a signal) will cause this routine to fall back
283 * to the synchronous version.
285 * FIXME: This really shouldn't busy wait like this.
290 static int gfs2_statfs_slow(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change_host
*sc
)
292 struct gfs2_holder ri_gh
;
293 struct gfs2_rgrpd
*rgd_next
;
294 struct gfs2_holder
*gha
, *gh
;
295 unsigned int slots
= 64;
300 memset(sc
, 0, sizeof(struct gfs2_statfs_change_host
));
301 gha
= kcalloc(slots
, sizeof(struct gfs2_holder
), GFP_KERNEL
);
305 error
= gfs2_rindex_hold(sdp
, &ri_gh
);
309 rgd_next
= gfs2_rgrpd_get_first(sdp
);
314 for (x
= 0; x
< slots
; x
++) {
317 if (gh
->gh_gl
&& gfs2_glock_poll(gh
)) {
318 err
= gfs2_glock_wait(gh
);
320 gfs2_holder_uninit(gh
);
324 error
= statfs_slow_fill(
325 gh
->gh_gl
->gl_object
, sc
);
326 gfs2_glock_dq_uninit(gh
);
332 else if (rgd_next
&& !error
) {
333 error
= gfs2_glock_nq_init(rgd_next
->rd_gl
,
337 rgd_next
= gfs2_rgrpd_get_next(rgd_next
);
341 if (signal_pending(current
))
342 error
= -ERESTARTSYS
;
351 gfs2_glock_dq_uninit(&ri_gh
);
359 * gfs2_statfs_i - Do a statfs
360 * @sdp: the filesystem
361 * @sg: the sg structure
366 static int gfs2_statfs_i(struct gfs2_sbd
*sdp
, struct gfs2_statfs_change_host
*sc
)
368 struct gfs2_statfs_change_host
*m_sc
= &sdp
->sd_statfs_master
;
369 struct gfs2_statfs_change_host
*l_sc
= &sdp
->sd_statfs_local
;
371 spin_lock(&sdp
->sd_statfs_spin
);
374 sc
->sc_total
+= l_sc
->sc_total
;
375 sc
->sc_free
+= l_sc
->sc_free
;
376 sc
->sc_dinodes
+= l_sc
->sc_dinodes
;
378 spin_unlock(&sdp
->sd_statfs_spin
);
382 if (sc
->sc_free
> sc
->sc_total
)
383 sc
->sc_free
= sc
->sc_total
;
384 if (sc
->sc_dinodes
< 0)
391 * gfs2_statfs - Gather and return stats about the filesystem
392 * @sb: The superblock
393 * @statfsbuf: The buffer
395 * Returns: 0 on success or error code
398 static int gfs2_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
400 struct super_block
*sb
= dentry
->d_inode
->i_sb
;
401 struct gfs2_sbd
*sdp
= sb
->s_fs_info
;
402 struct gfs2_statfs_change_host sc
;
405 if (gfs2_tune_get(sdp
, gt_statfs_slow
))
406 error
= gfs2_statfs_slow(sdp
, &sc
);
408 error
= gfs2_statfs_i(sdp
, &sc
);
413 buf
->f_type
= GFS2_MAGIC
;
414 buf
->f_bsize
= sdp
->sd_sb
.sb_bsize
;
415 buf
->f_blocks
= sc
.sc_total
;
416 buf
->f_bfree
= sc
.sc_free
;
417 buf
->f_bavail
= sc
.sc_free
;
418 buf
->f_files
= sc
.sc_dinodes
+ sc
.sc_free
;
419 buf
->f_ffree
= sc
.sc_free
;
420 buf
->f_namelen
= GFS2_FNAMESIZE
;
426 * gfs2_remount_fs - called when the FS is remounted
427 * @sb: the filesystem
428 * @flags: the remount flags
429 * @data: extra data passed in (not used right now)
434 static int gfs2_remount_fs(struct super_block
*sb
, int *flags
, char *data
)
436 struct gfs2_sbd
*sdp
= sb
->s_fs_info
;
439 error
= gfs2_mount_args(sdp
, data
, 1);
443 if (sdp
->sd_args
.ar_spectator
)
446 if (*flags
& MS_RDONLY
) {
447 if (!(sb
->s_flags
& MS_RDONLY
))
448 error
= gfs2_make_fs_ro(sdp
);
449 } else if (!(*flags
& MS_RDONLY
) &&
450 (sb
->s_flags
& MS_RDONLY
)) {
451 error
= gfs2_make_fs_rw(sdp
);
459 * gfs2_drop_inode - Drop an inode (test for remote unlink)
460 * @inode: The inode to drop
462 * If we've received a callback on an iopen lock then its because a
463 * remote node tried to deallocate the inode but failed due to this node
464 * still having the inode open. Here we mark the link count zero
465 * since we know that it must have reached zero if the GLF_DEMOTE flag
466 * is set on the iopen glock. If we didn't do a disk read since the
467 * remote node removed the final link then we might otherwise miss
468 * this event. This check ensures that this node will deallocate the
469 * inode's blocks, or alternatively pass the baton on to another
470 * node for later deallocation.
473 static void gfs2_drop_inode(struct inode
*inode
)
475 struct gfs2_inode
*ip
= GFS2_I(inode
);
477 if (test_bit(GIF_USER
, &ip
->i_flags
) && inode
->i_nlink
) {
478 struct gfs2_glock
*gl
= ip
->i_iopen_gh
.gh_gl
;
479 if (gl
&& test_bit(GLF_DEMOTE
, &gl
->gl_flags
))
482 generic_drop_inode(inode
);
486 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
487 * @inode: The VFS inode
491 static void gfs2_clear_inode(struct inode
*inode
)
493 struct gfs2_inode
*ip
= GFS2_I(inode
);
495 /* This tells us its a "real" inode and not one which only
496 * serves to contain an address space (see rgrp.c, meta_io.c)
497 * which therefore doesn't have its own glocks.
499 if (test_bit(GIF_USER
, &ip
->i_flags
)) {
500 ip
->i_gl
->gl_object
= NULL
;
501 gfs2_glock_put(ip
->i_gl
);
503 if (ip
->i_iopen_gh
.gh_gl
) {
504 ip
->i_iopen_gh
.gh_gl
->gl_object
= NULL
;
505 gfs2_glock_dq_uninit(&ip
->i_iopen_gh
);
510 static int is_ancestor(const struct dentry
*d1
, const struct dentry
*d2
)
516 } while (!IS_ROOT(d1
));
521 * gfs2_show_options - Show mount options for /proc/mounts
522 * @s: seq_file structure
525 * Returns: 0 on success or error code
528 static int gfs2_show_options(struct seq_file
*s
, struct vfsmount
*mnt
)
530 struct gfs2_sbd
*sdp
= mnt
->mnt_sb
->s_fs_info
;
531 struct gfs2_args
*args
= &sdp
->sd_args
;
533 if (is_ancestor(mnt
->mnt_root
, sdp
->sd_master_dir
))
534 seq_printf(s
, ",meta");
535 if (args
->ar_lockproto
[0])
536 seq_printf(s
, ",lockproto=%s", args
->ar_lockproto
);
537 if (args
->ar_locktable
[0])
538 seq_printf(s
, ",locktable=%s", args
->ar_locktable
);
539 if (args
->ar_hostdata
[0])
540 seq_printf(s
, ",hostdata=%s", args
->ar_hostdata
);
541 if (args
->ar_spectator
)
542 seq_printf(s
, ",spectator");
543 if (args
->ar_ignore_local_fs
)
544 seq_printf(s
, ",ignore_local_fs");
545 if (args
->ar_localflocks
)
546 seq_printf(s
, ",localflocks");
547 if (args
->ar_localcaching
)
548 seq_printf(s
, ",localcaching");
550 seq_printf(s
, ",debug");
551 if (args
->ar_upgrade
)
552 seq_printf(s
, ",upgrade");
553 if (args
->ar_posix_acl
)
554 seq_printf(s
, ",acl");
555 if (args
->ar_quota
!= GFS2_QUOTA_DEFAULT
) {
557 switch (args
->ar_quota
) {
561 case GFS2_QUOTA_ACCOUNT
:
571 seq_printf(s
, ",quota=%s", state
);
573 if (args
->ar_suiddir
)
574 seq_printf(s
, ",suiddir");
575 if (args
->ar_data
!= GFS2_DATA_DEFAULT
) {
577 switch (args
->ar_data
) {
578 case GFS2_DATA_WRITEBACK
:
581 case GFS2_DATA_ORDERED
:
588 seq_printf(s
, ",data=%s", state
);
595 * We have to (at the moment) hold the inodes main lock to cover
596 * the gap between unlocking the shared lock on the iopen lock and
597 * taking the exclusive lock. I'd rather do a shared -> exclusive
598 * conversion on the iopen lock, but we can change that later. This
599 * is safe, just less efficient.
602 static void gfs2_delete_inode(struct inode
*inode
)
604 struct gfs2_sbd
*sdp
= inode
->i_sb
->s_fs_info
;
605 struct gfs2_inode
*ip
= GFS2_I(inode
);
606 struct gfs2_holder gh
;
609 if (!test_bit(GIF_USER
, &ip
->i_flags
))
612 error
= gfs2_glock_nq_init(ip
->i_gl
, LM_ST_EXCLUSIVE
, 0, &gh
);
613 if (unlikely(error
)) {
614 gfs2_glock_dq_uninit(&ip
->i_iopen_gh
);
618 gfs2_glock_dq_wait(&ip
->i_iopen_gh
);
619 gfs2_holder_reinit(LM_ST_EXCLUSIVE
, LM_FLAG_TRY_1CB
| GL_NOCACHE
, &ip
->i_iopen_gh
);
620 error
= gfs2_glock_nq(&ip
->i_iopen_gh
);
624 if (S_ISDIR(inode
->i_mode
) &&
625 (ip
->i_diskflags
& GFS2_DIF_EXHASH
)) {
626 error
= gfs2_dir_exhash_dealloc(ip
);
632 error
= gfs2_ea_dealloc(ip
);
637 if (!gfs2_is_stuffed(ip
)) {
638 error
= gfs2_file_dealloc(ip
);
643 error
= gfs2_dinode_dealloc(ip
);
648 error
= gfs2_trans_begin(sdp
, 0, sdp
->sd_jdesc
->jd_blocks
);
651 /* Needs to be done before glock release & also in a transaction */
652 truncate_inode_pages(&inode
->i_data
, 0);
656 if (test_bit(HIF_HOLDER
, &ip
->i_iopen_gh
.gh_iflags
))
657 gfs2_glock_dq(&ip
->i_iopen_gh
);
658 gfs2_holder_uninit(&ip
->i_iopen_gh
);
659 gfs2_glock_dq_uninit(&gh
);
660 if (error
&& error
!= GLR_TRYFAILED
)
661 fs_warn(sdp
, "gfs2_delete_inode: %d\n", error
);
663 truncate_inode_pages(&inode
->i_data
, 0);
667 static struct inode
*gfs2_alloc_inode(struct super_block
*sb
)
669 struct gfs2_inode
*ip
;
671 ip
= kmem_cache_alloc(gfs2_inode_cachep
, GFP_KERNEL
);
679 static void gfs2_destroy_inode(struct inode
*inode
)
681 kmem_cache_free(gfs2_inode_cachep
, inode
);
684 const struct super_operations gfs2_super_ops
= {
685 .alloc_inode
= gfs2_alloc_inode
,
686 .destroy_inode
= gfs2_destroy_inode
,
687 .write_inode
= gfs2_write_inode
,
688 .delete_inode
= gfs2_delete_inode
,
689 .put_super
= gfs2_put_super
,
690 .write_super
= gfs2_write_super
,
691 .sync_fs
= gfs2_sync_fs
,
692 .write_super_lockfs
= gfs2_write_super_lockfs
,
693 .unlockfs
= gfs2_unlockfs
,
694 .statfs
= gfs2_statfs
,
695 .remount_fs
= gfs2_remount_fs
,
696 .clear_inode
= gfs2_clear_inode
,
697 .drop_inode
= gfs2_drop_inode
,
698 .show_options
= gfs2_show_options
,