From 822d87bc520fee8d95448c0aa3c728a4c1a595af Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Tue, 16 Jun 2026 13:58:15 +0200 Subject: block: split bdev_yield_claim() out of bdev_fput() bdev_fput() yields the holder claim and then closes the file, which is a deferred operation. Split the yield half into bdev_yield_claim() so a caller can give up the holder while the file - and therefore the block device - is still open, act on the device, and only then bdev_fput(). A filesystem that made a device unfreezable for a membership change with bdev_deny_freeze() undoes the deny on release with bdev_yield_claim(bdev_file); bdev_allow_freeze(file_bdev(bdev_file)); bdev_fput(bdev_file); Re-allowing only after the holder is yielded avoids stranding the filesystem on a racing freeze, and doing it while the file is still open avoids touching the block device after bdev_fput(). bdev_fput() yields again, which is a no-op once the claim has already been given up. Link: https://patch.msgid.link/20260616-work-super-freeze_deny_upstream-v2-2-b3567c7f994b@kernel.org Reviewed-by: Jan Kara Reviewd-by: Johannes Thumshirn Signed-off-by: Christian Brauner (Amutable) --- include/linux/blkdev.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index c419117be083..f4e5eca5a91f 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1840,6 +1840,7 @@ int bdev_thaw(struct block_device *bdev); int bdev_deny_freeze(struct block_device *bdev); void bdev_allow_freeze(struct block_device *bdev); void bdev_fput(struct file *bdev_file); +void bdev_yield_claim(struct file *bdev_file); struct io_comp_batch { struct rq_list req_list; -- cgit v1.2.3