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author | Christian Brauner <brauner@kernel.org> | 2024-03-14 15:24:13 +0100 |
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committer | Christian Brauner <brauner@kernel.org> | 2024-03-18 10:32:44 +0100 |
commit | 59a55a63c24624c7ad268f12c8f82d142ef6a6d4 (patch) | |
tree | 95f2bb37ccdb6db29f06645c68946f3f2c7d4c8c /fs/super.c | |
parent | afs: Fix occasional rmdir-then-VNOVNODE with generic/011 (diff) | |
download | linux-59a55a63c24624c7ad268f12c8f82d142ef6a6d4.tar.xz linux-59a55a63c24624c7ad268f12c8f82d142ef6a6d4.zip |
fs,block: get holder during claim
Now that we open block devices as files we need to deal with the
realities that closing is a deferred operation. An operation on the
block device such as e.g., freeze, thaw, or removal that runs
concurrently with umount, tries to acquire a stable reference on the
holder. The holder might already be gone though. Make that reliable by
grabbing a passive reference to the holder during bdev_open() and
releasing it during bdev_release().
Fixes: f3a608827d1f ("bdev: open block device as files") # mainline only
Reported-by: Christoph Hellwig <hch@infradead.org>
Link: https://lore.kernel.org/r/ZfEQQ9jZZVes0WCZ@infradead.org
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@infradead.org>
Tested-by: Yi Zhang <yi.zhang@redhat.com>
Reported-by: https://lore.kernel.org/r/CAHj4cs8tbDwKRwfS1=DmooP73ysM__xAb2PQc6XsAmWR+VuYmg@mail.gmail.com
Link: https://lore.kernel.org/r/20240315-freibad-annehmbar-ca68c375af91@brauner
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/super.c')
-rw-r--r-- | fs/super.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c index ee05ab6b37e7..71d9779c42b1 100644 --- a/fs/super.c +++ b/fs/super.c @@ -1515,11 +1515,29 @@ static int fs_bdev_thaw(struct block_device *bdev) return error; } +static void fs_bdev_super_get(void *data) +{ + struct super_block *sb = data; + + spin_lock(&sb_lock); + sb->s_count++; + spin_unlock(&sb_lock); +} + +static void fs_bdev_super_put(void *data) +{ + struct super_block *sb = data; + + put_super(sb); +} + const struct blk_holder_ops fs_holder_ops = { .mark_dead = fs_bdev_mark_dead, .sync = fs_bdev_sync, .freeze = fs_bdev_freeze, .thaw = fs_bdev_thaw, + .get_holder = fs_bdev_super_get, + .put_holder = fs_bdev_super_put, }; EXPORT_SYMBOL_GPL(fs_holder_ops); |