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authorJosh Durgin <josh.durgin@dreamhost.com>2011-11-21 18:19:13 -0800
committerAlex Elder <elder@dreamhost.com>2012-03-22 10:47:47 -0500
commitcc9d734c3d1b39c6a557673469aea26364060226 (patch)
tree67cc35424a31e6be289f118732f45e15c9432dad /drivers/block
parent1dbb439913f0fc0bc30d36411a4a3b3202c0aab1 (diff)
rbd: use a single value of snap_name to mean no snap
There's already a constant for this anyway. Since rbd_header_set_snap() is only used to set the rbd device snap_name field, just do that within that function rather than having it take the snap_name as an argument. Signed-off-by: Alex Elder <elder@dreamhost.com> Signed-off-by: Sage Weil <sage@newdream.net> v2: Changed interface rbd_header_set_snap() so it explicitly updates the snap_name in the rbd_device. Also added a BUILD_BUG_ON() to verify the size of the snap_name field is sufficient for SNAP_HEAD_NAME.
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/rbd.c19
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index dcdfe8dbf4f..d8d052d4225 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -553,20 +553,18 @@ static int snap_by_name(struct rbd_image_header *header, const char *snap_name,
return i;
}
-static int rbd_header_set_snap(struct rbd_device *dev,
- const char *snap_name,
- u64 *size)
+static int rbd_header_set_snap(struct rbd_device *dev, u64 *size)
{
struct rbd_image_header *header = &dev->header;
struct ceph_snap_context *snapc = header->snapc;
int ret = -ENOENT;
+ BUILD_BUG_ON(sizeof (dev->snap_name) < sizeof (RBD_SNAP_HEAD_NAME));
+
down_write(&header->snap_rwsem);
- if (!snap_name ||
- !*snap_name ||
- strcmp(snap_name, "-") == 0 ||
- strcmp(snap_name, RBD_SNAP_HEAD_NAME) == 0) {
+ if (!memcmp(dev->snap_name, RBD_SNAP_HEAD_NAME,
+ sizeof (RBD_SNAP_HEAD_NAME))) {
if (header->total_snaps)
snapc->seq = header->snap_seq;
else
@@ -576,7 +574,7 @@ static int rbd_header_set_snap(struct rbd_device *dev,
if (size)
*size = header->image_size;
} else {
- ret = snap_by_name(header, snap_name, &snapc->seq, size);
+ ret = snap_by_name(header, dev->snap_name, &snapc->seq, size);
if (ret < 0)
goto done;
@@ -1729,7 +1727,7 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
if (rc)
return rc;
- rc = rbd_header_set_snap(rbd_dev, rbd_dev->snap_name, &total_size);
+ rc = rbd_header_set_snap(rbd_dev, &total_size);
if (rc)
return rc;
@@ -2215,7 +2213,8 @@ static ssize_t rbd_add(struct bus_type *bus,
}
if (rbd_dev->snap_name[0] == 0)
- rbd_dev->snap_name[0] = '-';
+ memcpy(rbd_dev->snap_name, RBD_SNAP_HEAD_NAME,
+ sizeof (RBD_SNAP_HEAD_NAME));
rbd_dev->obj_len = strlen(rbd_dev->obj);
snprintf(rbd_dev->obj_md_name, sizeof(rbd_dev->obj_md_name), "%s%s",