Currently we already have the super_operations::shutdown() callback,
which is called when the block device of a filesystem is marked dead.
However this is mostly for single(ish) block device filesystems.
For multi-device filesystems, they may afford a missing device, thus may
continue work without fully shutdown the filesystem.
So add a new super_operation::shutdown_bdev() callback, for mutli-device
filesystems like btrfs and bcachefs.
For now the only user is fs_holder_ops::mark_dead(), which will call
shutdown_bdev() if supported.
If not supported then fallback to the original shutdown() callback.
Btrfs is going to add the usage of shutdown_bdev() soon.
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
fs/super.c | 4 +++-
include/linux/fs.h | 10 ++++++++++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/fs/super.c b/fs/super.c
index 21799e213fd7..8242a03bd5ce 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1461,7 +1461,9 @@ static void fs_bdev_mark_dead(struct block_device *bdev, bool surprise)
sync_filesystem(sb);
shrink_dcache_sb(sb);
evict_inodes(sb);
- if (sb->s_op->shutdown)
+ if (sb->s_op->shutdown_bdev)
+ sb->s_op->shutdown_bdev(sb, bdev);
+ else if (sb->s_op->shutdown)
sb->s_op->shutdown(sb);
super_unlock_shared(sb);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 96c7925a6551..4f6b4b3cbe22 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2363,7 +2363,17 @@ struct super_operations {
struct shrink_control *);
long (*free_cached_objects)(struct super_block *,
struct shrink_control *);
+ /*
+ * For single-device filesystems. Called when the only block device is
+ * marked dead.
+ */
void (*shutdown)(struct super_block *sb);
+
+ /*
+ * For multi-device filesystems. Called when any of its block device is
+ * marked dead.
+ */
+ void (*shutdown_bdev)(struct super_block *sb, struct block_device *bdev);
};
/*
--
2.49.0
