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Btrfs: remove scrub_super_lock holding in btrfs_sync_log()

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Originally, we introduced scrub_super_lock to synchronize
tree log code with scrubbing super.

However we can replace scrub_super_lock with device_list_mutex,
because writing super will hold this mutex, this will reduce an extra
lock holding when writing supers in sync log code.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Wang Shilong
2013-10-25 19:12:02 +08:00
committed by Chris Mason
parent 7fdf4b608d
commit 9b011adfe1
5 changed files with 8 additions and 20 deletions
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18
fs/btrfs/scrub.c
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@ -2932,13 +2932,15 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
atomic_inc(&fs_info->scrubs_running);
mutex_unlock(&fs_info->scrub_lock);
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
if (!is_dev_replace) {
down_read(&fs_info->scrub_super_lock);
/*
* by holding device list mutex, we can
* kick off writing super in log tree sync.
*/
ret = scrub_supers(sctx, dev);
up_read(&fs_info->scrub_super_lock);
}
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
if (!ret)
ret = scrub_enumerate_chunks(sctx, dev, start, end,
@ -2988,16 +2990,6 @@ void btrfs_scrub_continue(struct btrfs_root *root)
wake_up(&fs_info->scrub_pause_wait);
}
void btrfs_scrub_pause_super(struct btrfs_root *root)
{
down_write(&root->fs_info->scrub_super_lock);
}
void btrfs_scrub_continue_super(struct btrfs_root *root)
{
up_write(&root->fs_info->scrub_super_lock);
}
int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info)
{
mutex_lock(&fs_info->scrub_lock);