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| author | Ming Lei | 2015-11-17 15:32:47 +0100 |
|---|---|---|
| committer | Karel Zak | 2015-11-19 11:27:36 +0100 |
| commit | 64c3bb3cb7ead2faa97aa6d400d65f392df3dba8 (patch) | |
| tree | c4d0d92ea1f494c3d981d3614b79b1f033f9a75f /include/loopdev.h | |
| parent | blkid: don't mark zfs as RAID (diff) | |
| download | kernel-qcow2-util-linux-64c3bb3cb7ead2faa97aa6d400d65f392df3dba8.tar.gz kernel-qcow2-util-linux-64c3bb3cb7ead2faa97aa6d400d65f392df3dba8.tar.xz kernel-qcow2-util-linux-64c3bb3cb7ead2faa97aa6d400d65f392df3dba8.zip | |
losetup: support ioctl cmd of LOOP_SET_DIRECT_IO
From v4.4, linux kernel starts to support direct I/O and
AIO to backing file for loop driver, so allow losetup to
enable the feature by using LOOP_SET_DIRECT_IO ioctl cmd.
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Diffstat (limited to 'include/loopdev.h')
| -rw-r--r-- | include/loopdev.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/loopdev.h b/include/loopdev.h index 573a5699d..9a7f6ba69 100644 --- a/include/loopdev.h +++ b/include/loopdev.h @@ -23,6 +23,7 @@ #define LOOP_GET_STATUS64 0x4C05 /* #define LOOP_CHANGE_FD 0x4C06 */ #define LOOP_SET_CAPACITY 0x4C07 +#define LOOP_SET_DIRECT_IO 0x4C08 /* /dev/loop-control interface */ #ifndef LOOP_CTL_ADD @@ -164,6 +165,7 @@ extern int loopcxt_next(struct loopdev_cxt *lc); extern int loopcxt_setup_device(struct loopdev_cxt *lc); extern int loopcxt_delete_device(struct loopdev_cxt *lc); extern int loopcxt_set_capacity(struct loopdev_cxt *lc); +extern int loopcxt_set_dio(struct loopdev_cxt *lc, unsigned long use_dio); int loopcxt_set_offset(struct loopdev_cxt *lc, uint64_t offset); int loopcxt_set_sizelimit(struct loopdev_cxt *lc, uint64_t sizelimit); |