diff options
| author | Josh Durgin <josh.durgin@dreamhost.com> | 2011-11-21 18:19:13 -0800 |
|---|---|---|
| committer | Alex Elder <elder@dreamhost.com> | 2012-03-22 10:47:47 -0500 |
| commit | cc9d734c3d1b39c6a557673469aea26364060226 (patch) | |
| tree | 67cc35424a31e6be289f118732f45e15c9432dad /drivers/block | |
| parent | 1dbb439913f0fc0bc30d36411a4a3b3202c0aab1 (diff) | |
| download | blackbird-op-linux-cc9d734c3d1b39c6a557673469aea26364060226.tar.gz blackbird-op-linux-cc9d734c3d1b39c6a557673469aea26364060226.zip | |
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.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index dcdfe8dbf4f1..d8d052d42258 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", |
