On 2013年11月27日 10:15, Hu Tao wrote:
Signed-off-by: Hu Tao <hu...@cn.fujitsu.com>
---
block/raw-posix.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index f836c8e..c563073 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1050,6 +1050,39 @@ static int64_t
raw_get_allocated_file_size(BlockDriverState *bs)
return (int64_t)st.st_blocks * 512;
}
+#ifdef __linux__
+static int raw_preallocate2(int fd, int64_t offset, int64_t length)
+{
+ int ret = -1;
+
+ ret = fallocate(fd, 0, offset, length);
+
+ /* fallback to posix_fallocate() if fallocate() is not supported */
+ if (ret < 0 && (errno == ENOSYS || errno == EOPNOTSUPP)) {
+ ret = posix_fallocate(fd, offset, length);
+ }
+
+ return ret;
+}
+#else
+static int raw_preallocate2(int fd, int64_t offset, int64_t length)
+{
+ return posix_fallocate(fd, offset, length);
+}
+#endif
+
+static int raw_preallocate(BlockDriverState *bs, int64_t offset, int64_t
length)
+{
+ BDRVRawState *s = bs->opaque;
+ int64_t len = bdrv_getlength(bs);
+
+ if (offset + length < 0 || offset + length > len) {
+ return -1;
-EINVAL
Fam
+ }
+
+ return raw_preallocate2(s->fd, offset, length);
+}
+
static int raw_create(const char *filename, QEMUOptionParameter *options,
Error **errp)
{
@@ -1221,6 +1254,7 @@ static BlockDriver bdrv_file = {
.bdrv_close = raw_close,
.bdrv_create = raw_create,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
+ .bdrv_preallocate = raw_preallocate,
.bdrv_co_get_block_status = raw_co_get_block_status,
.bdrv_aio_readv = raw_aio_readv,
