diff options
| author | Martijn Coenen <maco@android.com> | 2019-09-04 22:49:01 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-10-01 18:36:01 +0300 |
| commit | 85560117d00f5d528e928918b8f61cadcefff98b (patch) | |
| tree | 56f84ad04027cb70b6536118004d519688c89cc6 /drivers/block/loop.c | |
| parent | 2d5ba0c71210ff51d58c9d6521ddd47b2953151c (diff) | |
| download | linux-85560117d00f5d528e928918b8f61cadcefff98b.tar.xz | |
loop: change queue block size to match when using DIO
The loop driver assumes that if the passed in fd is opened with
O_DIRECT, the caller wants to use direct I/O on the loop device.
However, if the underlying block device has a different block size than
the loop block queue, direct I/O can't be enabled. Instead of requiring
userspace to manually change the blocksize and re-enable direct I/O,
just change the queue block sizes to match, as well as the io_min size.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martijn Coenen <maco@android.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/loop.c')
| -rw-r--r-- | drivers/block/loop.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 1410fa893653..f6f77eaa7217 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -994,6 +994,16 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync) blk_queue_write_cache(lo->lo_queue, true, false); + if (io_is_direct(lo->lo_backing_file) && inode->i_sb->s_bdev) { + /* In case of direct I/O, match underlying block size */ + unsigned short bsize = bdev_logical_block_size( + inode->i_sb->s_bdev); + + blk_queue_logical_block_size(lo->lo_queue, bsize); + blk_queue_physical_block_size(lo->lo_queue, bsize); + blk_queue_io_min(lo->lo_queue, bsize); + } + loop_update_rotational(lo); loop_update_dio(lo); set_capacity(lo->lo_disk, size); |