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 <jack@suse.cz>
Reviewd-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions