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authorHitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>2014-06-06 13:35:12 +0900
committerStefan Hajnoczi <stefanha@redhat.com>2014-06-06 14:54:43 +0200
commit5d039baba411ef90b53150ae394575b25c9bfb74 (patch)
tree89f7a8a1c53c281ed194175c07a30a5f4f53cebc
parentb544c1aba8681c2fe5d6715fbd37cf6caf1bc7bb (diff)
sheepdog: reload only header in a case of live snapshot
sheepdog driver doesn't need to read data_vdi_id[] when a live snapshot is created. Cc: Kevin Wolf <kwolf@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Cc: Liu Yuan <namei.unix@gmail.com> Cc: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
-rw-r--r--block/sheepdog.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 5f7e025b61..1fa19399f0 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -200,6 +200,8 @@ typedef struct SheepdogInode {
uint32_t data_vdi_id[MAX_DATA_OBJS];
} SheepdogInode;
+#define SD_INODE_HEADER_SIZE offsetof(SheepdogInode, data_vdi_id)
+
/*
* 64 bit FNV-1a non-zero initial basis
*/
@@ -1287,7 +1289,7 @@ static int reload_inode(BDRVSheepdogState *s, uint32_t snapid, const char *tag)
return -EIO;
}
- inode = g_malloc(sizeof(s->inode));
+ inode = g_malloc(SD_INODE_HEADER_SIZE);
ret = find_vdi_name(s, s->name, snapid, tag, &vid, false, &local_err);
if (ret) {
@@ -1297,13 +1299,14 @@ static int reload_inode(BDRVSheepdogState *s, uint32_t snapid, const char *tag)
}
ret = read_object(fd, s->aio_context, (char *)inode, vid_to_vdi_oid(vid),
- s->inode.nr_copies, sizeof(*inode), 0, s->cache_flags);
+ s->inode.nr_copies, SD_INODE_HEADER_SIZE, 0,
+ s->cache_flags);
if (ret < 0) {
goto out;
}
if (inode->vdi_id != s->inode.vdi_id) {
- memcpy(&s->inode, inode, sizeof(s->inode));
+ memcpy(&s->inode, inode, SD_INODE_HEADER_SIZE);
}
out: