The snapshot/subvolume deletion might spend lots of time, it would make
the remount task wait for a long time. This patch improve this problem,
we will break the deletion if the fs is remounted to be R/O. It will make
the users happy.
Cc: David Sterba <dste...@suse.cz>
Signed-off-by: Miao Xie <mi...@cn.fujitsu.com>
---
fs/btrfs/ctree.h | 12 ++++++++++++
fs/btrfs/disk-io.c | 15 ++-------------
fs/btrfs/extent-tree.c | 2 +-
3 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index df9824b..067233f 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3318,6 +3318,18 @@ static inline int btrfs_fs_closing(struct btrfs_fs_info
*fs_info)
smp_mb();
return fs_info->closing;
}
+
+/*
+ * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
+ * anything except sleeping. This function is used to check the status of
+ * the fs.
+ */
+static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root)
+{
+ return (root->fs_info->sb->s_flags & MS_RDONLY ||
+ btrfs_fs_closing(root->fs_info));
+}
+
static inline void free_fs_info(struct btrfs_fs_info *fs_info)
{
kfree(fs_info->balance_ctl);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c69ff46..78e2dfb 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1676,17 +1676,6 @@ static void end_workqueue_fn(struct btrfs_work *work)
bio_endio(bio, error);
}
-/*
- * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
- * anything except sleeping. This function is used to check the status of
- * the fs.
- */
-static inline int need_cleaner_sleep(struct btrfs_root *root)
-{
- return (root->fs_info->sb->s_flags & MS_RDONLY ||
- btrfs_fs_closing(root->fs_info));
-}
-
static int cleaner_kthread(void *arg)
{
struct btrfs_root *root = arg;
@@ -1696,7 +1685,7 @@ static int cleaner_kthread(void *arg)
again = 0;
/* Make the cleaner go to sleep early. */
- if (need_cleaner_sleep(root))
+ if (btrfs_need_cleaner_sleep(root))
goto sleep;
if (!mutex_trylock(&root->fs_info->cleaner_mutex))
@@ -1706,7 +1695,7 @@ static int cleaner_kthread(void *arg)
* Avoid the problem that we change the status of the fs
* during the above check and trylock.
*/
- if (need_cleaner_sleep(root)) {
+ if (btrfs_need_cleaner_sleep(root)) {
mutex_unlock(&root->fs_info->cleaner_mutex);
goto sleep;
}
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index fbeb0c0..455117a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7378,7 +7378,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(root);
while (1) {
- if (!for_reloc && btrfs_fs_closing(root->fs_info)) {
+ if (!for_reloc && btrfs_need_cleaner_sleep(root)) {
pr_debug("btrfs: drop snapshot early exit\n");
err = -EAGAIN;
goto out_end_trans;
--
1.8.1.4
--
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