Commit 87efb390 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

fs: add a method to shut down the file system 



Add a new ->shutdown super operation that can be used to tell the file
system to shut down, and call it from newly created holder ops when the
block device under a file system shuts down.

This only covers the main block device for "simple" file systems using
get_tree_bdev / mount_bdev.  File systems their own get_tree method
or opening additional devices will need to set up their own
blk_holder_ops.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarChristian Brauner <brauner@kernel.org>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarDarrick J. Wong <djwong@kernel.org>
Acked-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
Link: https://lore.kernel.org/r/20230601094459.1350643-12-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent f55e017c

fs/super.c

+19 −2
Original line number Diff line number Diff line
@@ -1206,6 +1206,22 @@ int get_tree_keyed(struct fs_context *fc, 
EXPORT_SYMBOL(get_tree_keyed);



#ifdef CONFIG_BLOCK

static void fs_mark_dead(struct block_device *bdev)

{

	struct super_block *sb;



	sb = get_super(bdev);

	if (!sb)

		return;



	if (sb->s_op->shutdown)

		sb->s_op->shutdown(sb);

	drop_super(sb);

}



static const struct blk_holder_ops fs_holder_ops = {

	.mark_dead		= fs_mark_dead,

};



static int set_bdev_super(struct super_block *s, void *data)

{
@@ -1248,7 +1264,8 @@ int get_tree_bdev(struct fs_context *fc, 
	if (!fc->source)

		return invalf(fc, "No source specified");



	bdev = blkdev_get_by_path(fc->source, mode, fc->fs_type, NULL);

	bdev = blkdev_get_by_path(fc->source, mode, fc->fs_type,

				  &fs_holder_ops);

	if (IS_ERR(bdev)) {

		errorf(fc, "%s: Can't open blockdev", fc->source);

		return PTR_ERR(bdev);
@@ -1333,7 +1350,7 @@ struct dentry *mount_bdev(struct file_system_type *fs_type, 
	if (!(flags & SB_RDONLY))

		mode |= FMODE_WRITE;



	bdev = blkdev_get_by_path(dev_name, mode, fs_type, NULL);

	bdev = blkdev_get_by_path(dev_name, mode, fs_type, &fs_holder_ops);

	if (IS_ERR(bdev))

		return ERR_CAST(bdev);

include/linux/fs.h

+1 −0
Original line number Diff line number Diff line
@@ -1932,6 +1932,7 @@ struct super_operations { 
				  struct shrink_control *);

	long (*free_cached_objects)(struct super_block *,

				    struct shrink_control *);

	void (*shutdown)(struct super_block *sb);

};



/*