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authorJan Kara <jack@suse.cz>2012-07-03 16:45:30 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-22 23:58:41 +0400
commitb3de653105180b57af90ef2f5b8441f085f4ff56 (patch)
treee7581933fbb53210620d4181ba2bf16c9d82502c
parenta1177825719ccef3f76ef39bbfd5ebb6087d53c7 (diff)
vfs: Reorder operations during sys_sync
Change the order of operations during sync from for_each_sb { writeback_inodes_sb(); sync_fs(nowait); __sync_blockdev(nowait); } for_each_sb { sync_inodes_sb(); sync_fs(wait); __sync_blockdev(wait); } to for_each_sb writeback_inodes_sb(); for_each_sb sync_fs(nowait); for_each_sb __sync_blockdev(nowait); for_each_sb sync_inodes_sb(); for_each_sb sync_fs(wait); for_each_sb __sync_blockdev(wait); This is a preparation for the following patches in this series. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/sync.c46
1 files changed, 34 insertions, 12 deletions
diff --git a/fs/sync.c b/fs/sync.c
index 66acd2ba91c..490e9020113 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -67,18 +67,28 @@ int sync_filesystem(struct super_block *sb)
}
EXPORT_SYMBOL_GPL(sync_filesystem);
-static void sync_one_sb(struct super_block *sb, void *arg)
+static void sync_inodes_one_sb(struct super_block *sb, void *arg)
{
if (!(sb->s_flags & MS_RDONLY))
- __sync_filesystem(sb, *(int *)arg);
+ sync_inodes_sb(sb);
}
-/*
- * Sync all the data for all the filesystems (called by sys_sync() and
- * emergency sync)
- */
-static void sync_filesystems(int wait)
+
+static void writeback_inodes_one_sb(struct super_block *sb, void *arg)
{
- iterate_supers(sync_one_sb, &wait);
+ if (!(sb->s_flags & MS_RDONLY))
+ writeback_inodes_sb(sb, WB_REASON_SYNC);
+}
+
+static void sync_fs_one_sb(struct super_block *sb, void *arg)
+{
+ if (!(sb->s_flags & MS_RDONLY) && sb->s_op->sync_fs)
+ sb->s_op->sync_fs(sb, *(int *)arg);
+}
+
+static void sync_blkdev_one_sb(struct super_block *sb, void *arg)
+{
+ if (!(sb->s_flags & MS_RDONLY))
+ __sync_blockdev(sb->s_bdev, *(int *)arg);
}
/*
@@ -87,9 +97,15 @@ static void sync_filesystems(int wait)
*/
SYSCALL_DEFINE0(sync)
{
+ int nowait = 0, wait = 1;
+
wakeup_flusher_threads(0, WB_REASON_SYNC);
- sync_filesystems(0);
- sync_filesystems(1);
+ iterate_supers(writeback_inodes_one_sb, NULL);
+ iterate_supers(sync_fs_one_sb, &nowait);
+ iterate_supers(sync_blkdev_one_sb, &nowait);
+ iterate_supers(sync_inodes_one_sb, NULL);
+ iterate_supers(sync_fs_one_sb, &wait);
+ iterate_supers(sync_blkdev_one_sb, &wait);
if (unlikely(laptop_mode))
laptop_sync_completion();
return 0;
@@ -97,12 +113,18 @@ SYSCALL_DEFINE0(sync)
static void do_sync_work(struct work_struct *work)
{
+ int nowait = 0;
+
/*
* Sync twice to reduce the possibility we skipped some inodes / pages
* because they were temporarily locked
*/
- sync_filesystems(0);
- sync_filesystems(0);
+ iterate_supers(sync_inodes_one_sb, &nowait);
+ iterate_supers(sync_fs_one_sb, &nowait);
+ iterate_supers(sync_blkdev_one_sb, &nowait);
+ iterate_supers(sync_inodes_one_sb, &nowait);
+ iterate_supers(sync_fs_one_sb, &nowait);
+ iterate_supers(sync_blkdev_one_sb, &nowait);
printk("Emergency Sync complete\n");
kfree(work);
}