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| author | Alessio Balsini <balsini@android.com> | 2019-10-23 20:17:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-29 11:15:09 +0300 |
| commit | 6303b51d182a269dc676e6350911321cb1350fa8 (patch) | |
| tree | 9108558aa667e0e5bc74ad9b3bdac9232293bad3 /drivers/block | |
| parent | 75d52a1d100c21aecb0aae6045a159af7d542507 (diff) | |
| download | linux-6303b51d182a269dc676e6350911321cb1350fa8.tar.xz | |
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 9f840d9fdfcb..f236b7984b94 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1546,6 +1546,7 @@ 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: |