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>
#ifdef CONFIG_XFS
bool is_xfs : 1;
#endif
+ bool has_discard : 1;
} BDRVRawState;
typedef struct BDRVRawReopenState {
}
#endif
+ s->has_discard = 1;
#ifdef CONFIG_XFS
if (platform_test_xfs_fd(s->fd)) {
s->is_xfs = 1;
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);
ret = -errno;
#endif
-#endif
if (ret == -EOPNOTSUPP) {
return 0;