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Date: Fri, 11 Apr 2014 17:50:00 +0800
From: Gu Zheng <guz.fnst@...fujitsu.com>
To: Kim <jaegeuk.kim@...sung.com>
CC: f2fs <linux-f2fs-devel@...ts.sourceforge.net>,
fsdevel <linux-fsdevel@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/7] 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@...fujitsu.com>
---
fs/f2fs/f2fs.h | 1 +
fs/f2fs/segment.c | 2 +-
fs/f2fs/super.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
3 files changed, 45 insertions(+), 3 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 90109fa..1130f9c 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1174,6 +1174,7 @@ 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 6672570..5c30255 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 5e20d2a..bea642a 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;
--
1.7.7
--
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