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f2fs: add the flush_merge handle in the remount flow 

Add the *remount* handle of flush_merge option, so that the users
can enable flush_merge in the runtime, such as the underlying device
handles the cache_flush command relatively slowly.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Gu Zheng 2014-04-11 17:50:00 +08:00 committed by Jaegeuk Kim
parent 8abfb36ab3
commit 876dc59eb1
3 changed files with 45 additions and 3 deletions
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1
fs/f2fs/f2fs.h
View File

@ -1177,6 +1177,7 @@ void destroy_node_manager_caches(void);
*/
void f2fs_balance_fs(struct f2fs_sb_info *);
void f2fs_balance_fs_bg(struct f2fs_sb_info *);
int issue_flush_thread(void *);
int f2fs_issue_flush(struct f2fs_sb_info *);
void invalidate_blocks(struct f2fs_sb_info *, block_t);
void refresh_sit_entry(struct f2fs_sb_info *, block_t, block_t);

2
fs/f2fs/segment.c
View File

@ -197,7 +197,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
f2fs_sync_fs(sbi->sb, true);
}
static int issue_flush_thread(void *data)
int issue_flush_thread(void *data)
{
struct f2fs_sb_info *sbi = data;
struct f2fs_sm_info *sm_i = SM_I(sbi);

45
fs/f2fs/super.c
View File

@ -594,6 +594,8 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
struct f2fs_sb_info *sbi = F2FS_SB(sb);
struct f2fs_mount_info org_mount_opt;
int err, active_logs;
bool need_restart_gc = false;
bool need_stop_gc = false;
sync_filesystem(sb);
@ -611,7 +613,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
/*
* Previous and new state of filesystem is RO,
* so no point in checking GC conditions.
* so skip checking GC and FLUSH_MERGE conditions.
*/
if ((sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
goto skip;
@ -625,18 +627,57 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
if (sbi->gc_thread) {
stop_gc_thread(sbi);
f2fs_sync_fs(sb, 1);
need_restart_gc = true;
}
} else if (test_opt(sbi, BG_GC) && !sbi->gc_thread) {
err = start_gc_thread(sbi);
if (err)
goto restore_opts;
need_stop_gc = true;
}
/*
* We stop issue flush thread if FS is mounted as RO
* or if flush_merge is not passed in mount option.
*/
if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
struct f2fs_sm_info *sm_info = sbi->sm_info;
if (sm_info->f2fs_issue_flush)
kthread_stop(sm_info->f2fs_issue_flush);
sm_info->issue_list = sm_info->dispatch_list = NULL;
sm_info->f2fs_issue_flush = NULL;
} else if (test_opt(sbi, FLUSH_MERGE)) {
struct f2fs_sm_info *sm_info = sbi->sm_info;
if (!sm_info->f2fs_issue_flush) {
dev_t dev = sbi->sb->s_bdev->bd_dev;
spin_lock_init(&sm_info->issue_lock);
init_waitqueue_head(&sm_info->flush_wait_queue);
sm_info->f2fs_issue_flush =
kthread_run(issue_flush_thread, sbi,
"f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
if (IS_ERR(sm_info->f2fs_issue_flush)) {
err = PTR_ERR(sm_info->f2fs_issue_flush);
sm_info->f2fs_issue_flush = NULL;
goto restore_gc;
}
}
}
skip:
/* Update the POSIXACL Flag */
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
return 0;
restore_gc:
if (need_restart_gc) {
if (start_gc_thread(sbi))
f2fs_msg(sbi->sb, KERN_WARNING,
"background gc thread is stop");
} else if (need_stop_gc) {
stop_gc_thread(sbi);
}
restore_opts:
sbi->mount_opt = org_mount_opt;
sbi->active_logs = active_logs;