On 01/16/2013 10:23 PM, Josh Durgin wrote:
> On 01/04/2013 07:07 AM, Alex Elder wrote:
>> The two remaining osd ops used by rbd are CEPH_OSD_OP_WATCH and
>> CEPH_OSD_OP_NOTIFY_ACK. Move the setup of those operations into
>> rbd_osd_req_op_create(), and get rid of rbd_create_rw_op() and
>> rbd_destroy_op().
>>
>> Signed-off-by: Alex Elder <el...@inktank.com>
>> ---
>> drivers/block/rbd.c | 68
>> ++++++++++++++++++++-------------------------------
>> 1 file changed, 27 insertions(+), 41 deletions(-)
>>
>> diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
>> index 9f41c32..21fbf82 100644
>> --- a/drivers/block/rbd.c
>> +++ b/drivers/block/rbd.c
>> @@ -1027,24 +1027,6 @@ out_err:
>> return NULL;
>> }
>>
>> -static struct ceph_osd_req_op *rbd_create_rw_op(int opcode, u64 ofs,
>> u64 len)
>> -{
>> - struct ceph_osd_req_op *op;
>> -
>> - op = kzalloc(sizeof (*op), GFP_NOIO);
>> - if (!op)
>> - return NULL;
>> -
>> - op->op = opcode;
>> -
>> - return op;
>> -}
>> -
>> -static void rbd_destroy_op(struct ceph_osd_req_op *op)
>> -{
>> - kfree(op);
>> -}
>> -
>> struct ceph_osd_req_op *rbd_osd_req_op_create(u16 opcode, ...)
>> {
>> struct ceph_osd_req_op *op;
>> @@ -1087,6 +1069,16 @@ struct ceph_osd_req_op *rbd_osd_req_op_create(u16
>> opcode, ...)
>> op->cls.indata_len = (u32) size;
>> op->payload_len += size;
>> break;
>> + case CEPH_OSD_OP_NOTIFY_ACK:
>> + case CEPH_OSD_OP_WATCH:
>> + /* rbd_osd_req_op_create(NOTIFY_ACK, cookie, version) */
>> + /* rbd_osd_req_op_create(WATCH, cookie, version, flag) */
>> + op->watch.cookie = va_arg(args, u64);
>> + op->watch.ver = va_arg(args, u64);
>> + op->watch.ver = cpu_to_le64(op->watch.ver); /* XXX */
>
> why the /* XXX */ comment?
Because it's the only value here that is converted
from cpu byte order. It was added in this commit:
a71b891bc7d77a070e723c8c53d1dd73cf931555
rbd: send header version when notifying
And I think was done without full understanding that it
was being done different from all the others. I think
it may be wrong but I haven't really looked at it yet.
Pulling them all into this function made this difference
more obvious.
It was a "note to self" that I wanted to fix that.
I normally try to resolve anything like that before I
post for review but I guess I forgot. There may be
others.
-Alex
>> + if (opcode == CEPH_OSD_OP_WATCH && va_arg(args, int))
>> + op->watch.flag = (u8) 1;
>> + break;
>> default:
>> rbd_warn(NULL, "unsupported opcode %hu\n", opcode);
>> kfree(op);
>> @@ -1434,14 +1426,10 @@ static int rbd_req_sync_notify_ack(struct
>> rbd_device *rbd_dev,
>> struct ceph_osd_req_op *op;
>> int ret;
>>
>> - op = rbd_create_rw_op(CEPH_OSD_OP_NOTIFY_ACK, 0, 0);
>> + op = rbd_osd_req_op_create(CEPH_OSD_OP_NOTIFY_ACK, notify_id, ver);
>> if (!op)
>> return -ENOMEM;
>>
>> - op->watch.ver = cpu_to_le64(ver);
>> - op->watch.cookie = notify_id;
>> - op->watch.flag = 0;
>> -
>> ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP,
>> rbd_dev->header_name, 0, 0, NULL,
>> NULL, 0,
>> @@ -1450,7 +1438,8 @@ static int rbd_req_sync_notify_ack(struct
>> rbd_device *rbd_dev,
>> NULL, 0,
>> rbd_simple_req_cb, 0, NULL);
>>
>> - rbd_destroy_op(op);
>> + rbd_osd_req_op_destroy(op);
>> +
>> return ret;
>> }
>>
>> @@ -1480,14 +1469,9 @@ static void rbd_watch_cb(u64 ver, u64 notify_id,
>> u8 opcode, void *data)
>> */
>> static int rbd_req_sync_watch(struct rbd_device *rbd_dev, int start)
>> {
>> - struct ceph_osd_req_op *op;
>> struct ceph_osd_request **linger_req = NULL;
>> - __le64 version = 0;
>> - int ret;
>> -
>> - op = rbd_create_rw_op(CEPH_OSD_OP_WATCH, 0, 0);
>> - if (!op)
>> - return -ENOMEM;
>> + struct ceph_osd_req_op *op;
>> + int ret = 0;
>>
>> if (start) {
>> struct ceph_osd_client *osdc;
>> @@ -1496,26 +1480,28 @@ static int rbd_req_sync_watch(struct rbd_device
>> *rbd_dev, int start)
>> 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);
>> + return ret;
>> linger_req = &rbd_dev->watch_request;
>> + } else {
>> + rbd_assert(rbd_dev->watch_request != NULL);
>> }
>>
>> - op->watch.ver = version;
>> - op->watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
>> - op->watch.flag = (u8) start ? 1 : 0;
>> -
>> - ret = rbd_req_sync_op(rbd_dev,
>> + op = rbd_osd_req_op_create(CEPH_OSD_OP_WATCH,
>> + rbd_dev->watch_event->cookie,
>> + rbd_dev->header.obj_version, start);
>> + if (op)
>> + ret = rbd_req_sync_op(rbd_dev,
>> CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
>> op, rbd_dev->header_name,
>> 0, 0, NULL, linger_req, NULL);
>>
>> - if (!start || ret < 0) {
>> + /* Cancel the event if we're tearing down, or on error */
>> +
>> + if (!start || !op || ret < 0) {
>> ceph_osdc_cancel_event(rbd_dev->watch_event);
>> rbd_dev->watch_event = NULL;
>> }
>> -done:
>> - rbd_destroy_op(op);
>> + rbd_osd_req_op_destroy(op);
>>
>> return ret;
>> }
>>
>
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