diff options
| author | Hannes Reinecke <hare@suse.de> | 2017-06-08 13:46:45 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-06-08 08:40:00 -0600 |
| commit | f2c6df7dbf9a60e1cd9941f9fb376d4d9ad1e8dd (patch) | |
| tree | 79a9c0d9627fa253955532d6925e9606e1643f72 /include | |
| parent | 51001b7da364a24ed2464f3c22179efdc6b3a960 (diff) | |
loop: support 4k physical blocksize
When generating bootable VM images certain systems (most notably
s390x) require devices with 4k blocksize. This patch implements
a new flag 'LO_FLAGS_BLOCKSIZE' which will set the physical
blocksize to that of the underlying device, and allow to change
the logical blocksize for up to the physical blocksize.
Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/loop.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/linux/loop.h b/include/uapi/linux/loop.h index c8125ec1f4f2..a3960f98679c 100644 --- a/include/uapi/linux/loop.h +++ b/include/uapi/linux/loop.h @@ -22,6 +22,7 @@ enum { LO_FLAGS_AUTOCLEAR = 4, LO_FLAGS_PARTSCAN = 8, LO_FLAGS_DIRECT_IO = 16, + LO_FLAGS_BLOCKSIZE = 32, }; #include <asm/posix_types.h> /* for __kernel_old_dev_t */ @@ -59,6 +60,8 @@ struct loop_info64 { __u64 lo_init[2]; }; +#define LO_INFO_BLOCKSIZE(l) (l)->lo_init[0] + /* * Loop filter types */ |