From 907703d050df92979b3848ee42f88d5c9c6c13fe Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Tue, 13 Nov 2012 21:11:15 -0600 Subject: [PATCH] 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 Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 81 +++++++++++++++------------------------------ 1 file changed, 27 insertions(+), 54 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index d2a6e9589fab..9d21fcd7e188 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -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);