diff options
| author | Christoph Hellwig <hch@lst.de> | 2025-05-20 15:54:20 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-29 11:03:17 +0200 |
| commit | cd7f022296972daf35b750c3fa71a6bc9ebc0abf (patch) | |
| tree | 14e3d4e26832a1ec2fde5f6e9aab7c4c6b886546 | |
| parent | f6f5e9c8cb680c3cb9771fd9fa114319cbc4f514 (diff) | |
loop: don't require ->write_iter for writable files in loop_configure
[ Upstream commit 355341e4359b2d5edf0ed5e117f7e9e7a0a5dac0 ]
Block devices can be opened read-write even if they can't be written to
for historic reasons. Remove the check requiring file->f_op->write_iter
when the block devices was opened in loop_configure. The call to
loop_check_backing_file just below ensures the ->write_iter is present
for backing files opened for writing, which is the only check that is
actually needed.
Fixes: f5c84eff634b ("loop: Add sanity check for read/write_iter")
Reported-by: Christian Hesse <mail@eworm.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20250520135420.1177312-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/block/loop.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index fa9c77b8f4d2..0843d229b0f7 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -969,9 +969,6 @@ static int loop_configure(struct loop_device *lo, blk_mode_t mode, if (!file) return -EBADF; - if ((mode & BLK_OPEN_WRITE) && !file->f_op->write_iter) - return -EINVAL; - error = loop_check_backing_file(file); if (error) return error; |