diff options
| author | Jan Kara <jack@suse.cz> | 2023-07-24 10:51:45 -0700 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-08-10 10:34:56 +0200 |
| commit | aca740cecbe57b12bd9c1fc632092af5ebacda0c (patch) | |
| tree | f428c673f3260b06ad92c897fe70bc81c4150a31 /fs/romfs | |
| parent | a4f64a300a299f884a1da55d99c97a87061201cd (diff) | |
fs: open block device after superblock creation
Currently get_tree_bdev and mount_bdev open the block device before
committing to allocating a super block. That creates problems for
restricting the number of writers to a device, and also leads to a
unusual and not very helpful holder (the fs_type).
Reorganize the super block code to first look whether the superblock for
a particular device does already exist and open the block device only if
it doesn't.
[hch: port to before the bdev_handle changes,
duplicate the bdev read-only check from blkdev_get_by_path,
extend the fsfree_mutex coverage to protect against freezes,
fix an open bdev leak when the bdev is frozen,
use the bdev local variable more,
rename the s variable to sb to be more descriptive]
[brauner: remove references to mounts as they're mostly irrelevant]
[brauner & hch: fold fixes for romfs and cramfs for
syzbot+2faac0423fdc9692822b@syzkaller.appspotmail.com]
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Message-Id: <20230724175145.201318-1-hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/romfs')
| -rw-r--r-- | fs/romfs/super.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/romfs/super.c b/fs/romfs/super.c index c59b230d55b4..42d7a344472f 100644 --- a/fs/romfs/super.c +++ b/fs/romfs/super.c @@ -583,16 +583,18 @@ static int romfs_init_fs_context(struct fs_context *fc) */ static void romfs_kill_sb(struct super_block *sb) { + generic_shutdown_super(sb); + #ifdef CONFIG_ROMFS_ON_MTD if (sb->s_mtd) { - kill_mtd_super(sb); - return; + put_mtd_device(sb->s_mtd); + sb->s_mtd = NULL; } #endif #ifdef CONFIG_ROMFS_ON_BLOCK if (sb->s_bdev) { - kill_block_super(sb); - return; + sync_blockdev(sb->s_bdev); + blkdev_put(sb->s_bdev, sb->s_type); } #endif } |