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| 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/cramfs | |
| parent | a4f64a300a299f884a1da55d99c97a87061201cd (diff) | |
| download | linux-aca740cecbe57b12bd9c1fc632092af5ebacda0c.tar.gz linux-aca740cecbe57b12bd9c1fc632092af5ebacda0c.tar.bz2 linux-aca740cecbe57b12bd9c1fc632092af5ebacda0c.zip | |
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/cramfs')
| -rw-r--r-- | fs/cramfs/inode.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c index 27c6597aa1be..bc99d0fb8ad4 100644 --- a/fs/cramfs/inode.c +++ b/fs/cramfs/inode.c @@ -485,12 +485,16 @@ static void cramfs_kill_sb(struct super_block *sb) { struct cramfs_sb_info *sbi = CRAMFS_SB(sb); + generic_shutdown_super(sb); + if (IS_ENABLED(CONFIG_CRAMFS_MTD) && sb->s_mtd) { if (sbi && sbi->mtd_point_size) mtd_unpoint(sb->s_mtd, 0, sbi->mtd_point_size); - kill_mtd_super(sb); + put_mtd_device(sb->s_mtd); + sb->s_mtd = NULL; } else if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV) && sb->s_bdev) { - kill_block_super(sb); + sync_blockdev(sb->s_bdev); + blkdev_put(sb->s_bdev, sb->s_type); } kfree(sbi); } |