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rbd: combine rbd sync watch/unwatch functions 

The rbd_req_sync_watch() and rbd_req_sync_unwatch() functions are
nearly identical.  Combine them into a single function with a flag
indicating whether a watch is to be initiated or torn down.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-11-13 21:11:15 -06:00
parent 0903e875ca
commit 907703d050
1 changed files with 27 additions and 54 deletions
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81
drivers/block/rbd.c
View File

@ -1429,74 +1429,48 @@ static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
}
/*
* Request sync osd watch
* Request sync osd watch/unwatch. The value of "start" determines
* whether a watch request is being initiated or torn down.
*/
static int rbd_req_sync_watch(struct rbd_device *rbd_dev)
static int rbd_req_sync_watch(struct rbd_device *rbd_dev, int start)
{
struct ceph_osd_req_op *op;
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
struct ceph_osd_request **linger_req = NULL;
__le64 version = 0;
int ret;
op = rbd_create_rw_op(CEPH_OSD_OP_WATCH, 0);
if (!op)
return -ENOMEM;
ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0,
(void *)rbd_dev, &rbd_dev->watch_event);
if (ret < 0)
goto fail;
if (start) {
struct ceph_osd_client *osdc;
op->watch.ver = cpu_to_le64(rbd_dev->header.obj_version);
osdc = &rbd_dev->rbd_client->client->osdc;
ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, rbd_dev,
&rbd_dev->watch_event);
if (ret < 0)
goto done;
version = cpu_to_le64(rbd_dev->header.obj_version);
linger_req = &rbd_dev->watch_request;
}
op->watch.ver = version;
op->watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
op->watch.flag = 1;
op->watch.flag = (u8) start ? 1 : 0;
ret = rbd_req_sync_op(rbd_dev,
CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
op,
rbd_dev->header_name,
0, 0, NULL,
&rbd_dev->watch_request, NULL);
if (ret < 0)
goto fail_event;
op, rbd_dev->header_name,
0, 0, NULL, linger_req, NULL);
if (!start || ret < 0) {
ceph_osdc_cancel_event(rbd_dev->watch_event);
rbd_dev->watch_event = NULL;
}
done:
rbd_destroy_op(op);
return 0;
fail_event:
ceph_osdc_cancel_event(rbd_dev->watch_event);
rbd_dev->watch_event = NULL;
fail:
rbd_destroy_op(op);
return ret;
}
/*
* Request sync osd unwatch
*/
static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev)
{
struct ceph_osd_req_op *op;
int ret;
op = rbd_create_rw_op(CEPH_OSD_OP_WATCH, 0);
if (!op)
return -ENOMEM;
op->watch.ver = 0;
op->watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
op->watch.flag = 0;
ret = rbd_req_sync_op(rbd_dev,
CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
op,
rbd_dev->header_name,
0, 0, NULL, NULL, NULL);
rbd_destroy_op(op);
ceph_osdc_cancel_event(rbd_dev->watch_event);
rbd_dev->watch_event = NULL;
return ret;
}
@ -3033,7 +3007,7 @@ static int rbd_init_watch_dev(struct rbd_device *rbd_dev)
int ret, rc;
do {
ret = rbd_req_sync_watch(rbd_dev);
ret = rbd_req_sync_watch(rbd_dev, 1);
if (ret == -ERANGE) {
rc = rbd_dev_refresh(rbd_dev, NULL);
if (rc < 0)
@ -3752,8 +3726,7 @@ static void rbd_dev_release(struct device *dev)
rbd_dev->watch_request);
}
if (rbd_dev->watch_event)
rbd_req_sync_unwatch(rbd_dev);
rbd_req_sync_watch(rbd_dev, 0);
/* clean up and free blkdev */
rbd_free_disk(rbd_dev);