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fs: open block device after superblock creation

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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>
This commit is contained in:
Jan Kara 2023-07-24 10:51:45 -07:00 • committed by Christian Brauner
parent a4f64a300a
commit aca740cecb
3 changed files with 107 additions and 99 deletions
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10
fs/romfs/super.c
View file

@ -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
}