Reviewed-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
On 10/09/2012 02:00 PM, Alex Elder wrote:
Define a new function rbd_dev_v2_refresh() to update/refresh the
snapshot context for a format version 2 rbd image. This function
will update anything that is not fixed for the life of an rbd
image--at the moment this is mainly the snapshot context and (for
a base mapping) the size.
Update rbd_refresh_header() so it selects which function to use
based on the image format.
Rename __rbd_refresh_header() to be rbd_dev_v1_refresh()
to be consistent with the naming of its version 2 counterpart.
Similarly rename rbd_refresh_header() to be rbd_dev_refresh().
Unrelated--we use rbd_image_format_valid() here. Delete the other
use of it, which was primarily put in place to ensure that function
was referenced at the time it was defined.
Signed-off-by: Alex Elder <elder@xxxxxxxxxxx>
---
Changes in v2:
- also fetch size when refereshing image
- drop "snapc" from refresh function names
drivers/block/rbd.c | 55
+++++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 47 insertions(+), 8 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index d36e6d7..23f3beb 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -268,7 +268,8 @@ static void rbd_put_dev(struct rbd_device *rbd_dev)
put_device(&rbd_dev->dev);
}
-static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver);
+static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver);
+static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver);
static int rbd_open(struct block_device *bdev, fmode_t mode)
{
@@ -1304,7 +1305,7 @@ static void rbd_watch_cb(u64 ver, u64 notify_id,
u8 opcode, void *data)
dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n",
rbd_dev->header_name, (unsigned long long) notify_id,
(unsigned int) opcode);
- rc = rbd_refresh_header(rbd_dev, &hver);
+ rc = rbd_dev_refresh(rbd_dev, &hver);
if (rc)
pr_warning(RBD_DRV_NAME "%d got notification but failed to "
" update snaps: %d\n", rbd_dev->major, rc);
@@ -1729,7 +1730,7 @@ static void rbd_update_size(struct rbd_device
*rbd_dev)
/*
* only read the first part of the ondisk header, without the snaps info
*/
-static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver)
+static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver)
{
int ret;
struct rbd_image_header h;
@@ -1772,12 +1773,16 @@ static int __rbd_refresh_header(struct
rbd_device *rbd_dev, u64 *hver)
return ret;
}
-static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver)
+static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver)
{
int ret;
+ rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
- ret = __rbd_refresh_header(rbd_dev, hver);
+ if (rbd_dev->image_format == 1)
+ ret = rbd_dev_v1_refresh(rbd_dev, hver);
+ else
+ ret = rbd_dev_v2_refresh(rbd_dev, hver);
mutex_unlock(&ctl_mutex);
return ret;
@@ -1937,7 +1942,7 @@ static ssize_t rbd_image_refresh(struct device *dev,
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
int ret;
- ret = rbd_refresh_header(rbd_dev, NULL);
+ ret = rbd_dev_refresh(rbd_dev, NULL);
return ret < 0 ? ret : size;
}
@@ -2401,6 +2406,41 @@ static char *rbd_dev_snap_info(struct rbd_device
*rbd_dev, u32 which,
return ERR_PTR(-EINVAL);
}
+static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver)
+{
+ int ret;
+ __u8 obj_order;
+ u64 image_size;
+
+ down_write(&rbd_dev->header_rwsem);
+
+ /* Grab old values first, to see if they change */
+
+ obj_order = rbd_dev->header.obj_order,
+ image_size = rbd_dev->header.image_size;
+ ret = rbd_dev_v2_image_size(rbd_dev);
+ if (ret)
+ goto out;
+ rbd_assert(rbd_dev->header.obj_order == obj_order);
+ if (image_size != rbd_dev->header.image_size)
+ rbd_update_size(rbd_dev);
+
+ ret = rbd_dev_v2_snap_context(rbd_dev, hver);
+ dout("rbd_dev_v2_snap_context returned %d\n", ret);
+ if (ret)
+ goto out;
+ ret = rbd_dev_snaps_update(rbd_dev);
+ dout("rbd_dev_snaps_update returned %d\n", ret);
+ if (ret)
+ goto out;
+ ret = rbd_dev_snaps_register(rbd_dev);
+ dout("rbd_dev_snaps_register returned %d\n", ret);
+out:
+ up_write(&rbd_dev->header_rwsem);
+
+ return 0;
+}
+
/*
* Scan the rbd device's current snapshot list and compare it to the
* newly-received snapshot context. Remove any existing snapshots
@@ -2563,7 +2603,7 @@ static int rbd_init_watch_dev(struct rbd_device
*rbd_dev)
do {
ret = rbd_req_sync_watch(rbd_dev);
if (ret == -ERANGE) {
- rc = rbd_refresh_header(rbd_dev, NULL);
+ rc = rbd_dev_refresh(rbd_dev, NULL);
if (rc < 0)
return rc;
}
@@ -3044,7 +3084,6 @@ static ssize_t rbd_add(struct bus_type *bus,
rc = rbd_dev_probe(rbd_dev);
if (rc < 0)
goto err_out_client;
- rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
/* no need to lock here, as rbd_dev is not registered yet */
rc = rbd_dev_snaps_update(rbd_dev);
--
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