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authorGu Zheng <guz.fnst@cn.fujitsu.com>2014-04-11 17:50:00 +0800
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2014-05-07 10:21:55 +0900
commit876dc59eb1f0131c092803d0d206d47dd0119dfe (patch)
treeaab91a229ed656fa30000c5112b52206cc69cfbe
parent8abfb36ab396377ea712cd640c525fd5535d1dc9 (diff)
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>
-rw-r--r--fs/f2fs/f2fs.h1
-rw-r--r--fs/f2fs/segment.c2
-rw-r--r--fs/f2fs/super.c45
3 files changed, 45 insertions, 3 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index d3180f8c0f97..55152de1118c 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -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);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9993f94848fc..f6816e18db98 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -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);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 5e20d2a36eac..bea642aec0fe 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -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;