diff options
| author | Tony Breeds <tony@bakeyournoodle.com> | 2014-09-26 09:14:12 +1000 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2014-10-20 13:41:26 +0200 |
| commit | 7c15903789953ead14a417882657d52dc0c19a24 (patch) | |
| tree | 9e60d44c6875465077818bc74285f895c8321d87 /qemu-nbd.c | |
| parent | 38c4d0aea3e1264c86e282d99560330adf2b6e25 (diff) | |
| download | qemu-7c15903789953ead14a417882657d52dc0c19a24.zip | |
block/raw-posix: use seek_hole ahead of fiemap
try_fiemap() uses FIEMAP_FLAG_SYNC which has a significant performance
impact.
Prefer seek_hole() over fiemap() to avoid this impact where possible.
seek_hole is more widely used and, arguably, has potential to be
optimised in the kernel.
Reported-By: Michael Steffens <michael_steffens@posteo.de>
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Max Reitz <mreitz@redhat.com>
Cc: Pádraig Brady <pbrady@redhat.com>
Cc: Eric Blake <eblake@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qemu-nbd.c')
0 files changed, 0 insertions, 0 deletions