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loop: Add LOOP_SET_DIRECT_IO to compat ioctl

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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 <[email protected]>
Signed-off-by: Alessio Balsini <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Alessio Balsini 2019-08-07 01:48:28 +01:00 • committed by Jens Axboe
commit fdbe4eeeb1
1 changed files with 1 additions and 0 deletions
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1
drivers/block/loop.c
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@ -1755,6 +1755,7 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode,
case LOOP_SET_FD:
case LOOP_CHANGE_FD:
case LOOP_SET_BLOCK_SIZE:
case LOOP_SET_DIRECT_IO:
err = lo_ioctl(bdev, mode, cmd, arg);
break;
default: