diff options
| author | Alessio Balsini <balsini@android.com> | 2019-10-23 18:17:36 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-29 09:13:21 +0100 |
| commit | 896bb98754dca4ee08e20a6eb2457f1710258ee8 (patch) | |
| tree | 6aa811e3643d72e60b856ca4dd2e285c7950735a /drivers/block | |
| parent | 27add8a99692aa0fb6452c35e49db4ae55feb25f (diff) | |
loop: Add LOOP_SET_DIRECT_IO to compat ioctl
[ Upstream commit fdbe4eeeb1aac219b14f10c0ed31ae5d1123e9b8 ]
Enabling Direct I/O with loop devices helps reducing memory usage by
avoiding double caching. 32 bit applications running on 64 bits systems
are currently not able to request direct I/O because is missing from the
lo_compat_ioctl.
This patch fixes the compatibility issue mentioned above by exporting
LOOP_SET_DIRECT_IO as additional lo_compat_ioctl() entry.
The input argument for this ioctl is a single long converted to a 1-bit
boolean, so compatibility is preserved.
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Alessio Balsini <balsini@android.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/loop.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index da3902ac16c8..8aadd4d0c3a8 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1557,6 +1557,7 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode, arg = (unsigned long) compat_ptr(arg); case LOOP_SET_FD: case LOOP_CHANGE_FD: + case LOOP_SET_DIRECT_IO: err = lo_ioctl(bdev, mode, cmd, arg); break; default: |