From 5d039baba411ef90b53150ae394575b25c9bfb74 Mon Sep 17 00:00:00 2001 From: Hitoshi Mitake Date: Fri, 6 Jun 2014 13:35:12 +0900 Subject: [PATCH] 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 Cc: Stefan Hajnoczi Cc: Liu Yuan Cc: MORITA Kazutaka Signed-off-by: Hitoshi Mitake Signed-off-by: Stefan Hajnoczi --- block/sheepdog.c | 9 ++++++--- 1 file 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: -- 2.11.0