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| author | Paolo Bonzini <pbonzini@redhat.com> | 2013-01-14 16:26:53 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-01-15 10:03:47 +0100 |
| commit | c85191e5c9e14d65cc4281ef3b31f480227aa6dd (patch) | |
| tree | c9089e4c0827f17b010e5603b660472d3911cf65 /block/raw-posix.c | |
| parent | 3d4fa43e648f3b169e7ab5dd4e21312e510805d7 (diff) | |
| download | qemu-c85191e5c9e14d65cc4281ef3b31f480227aa6dd.zip qemu-c85191e5c9e14d65cc4281ef3b31f480227aa6dd.tar.gz qemu-c85191e5c9e14d65cc4281ef3b31f480227aa6dd.tar.bz2 | |
raw-posix: remember whether discard failed
Avoid sending system calls repeatedly if they shall fail. This
does not apply to XFS: if the filesystem-specific ioctl fails,
something weird is happening.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/raw-posix.c')
| -rw-r--r-- | block/raw-posix.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/block/raw-posix.c b/block/raw-posix.c index e8d79af..b647cfb 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -141,6 +141,7 @@ typedef struct BDRVRawState { #ifdef CONFIG_XFS bool is_xfs : 1; #endif + bool has_discard : 1; } BDRVRawState; typedef struct BDRVRawReopenState { @@ -292,6 +293,7 @@ static int raw_open_common(BlockDriverState *bs, const char *filename, } #endif + s->has_discard = 1; #ifdef CONFIG_XFS if (platform_test_xfs_fd(s->fd)) { s->is_xfs = 1; @@ -1078,10 +1080,12 @@ static coroutine_fn int raw_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) { int ret = -EOPNOTSUPP; - -#if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_XFS) BDRVRawState *s = bs->opaque; + if (!s->has_discard) { + return 0; + } + #ifdef CONFIG_XFS if (s->is_xfs) { return xfs_discard(s, sector_num, nb_sectors); @@ -1099,7 +1103,6 @@ static coroutine_fn int raw_co_discard(BlockDriverState *bs, ret = -errno; #endif -#endif if (ret == -EOPNOTSUPP) { return 0; |