From 1d769cd192fc8c4097b1e2cd41fdee6ba3d1b2af Mon Sep 17 00:00:00 2001 From: "M. Mohan Kumar" Date: Mon, 27 Sep 2010 12:22:13 +0530 Subject: 9p: Implement TGETLOCK Synopsis size[4] TGetlock tag[2] fid[4] getlock[n] size[4] RGetlock tag[2] getlock[n] Description TGetlock is used to test for the existence of byte range posix locks on a file identified by given fid. The reply contains getlock structure. If the lock could be placed it returns F_UNLCK in type field of getlock structure. Otherwise it returns the details of the conflicting locks in the getlock structure getlock structure: type[1] - Type of lock: F_RDLCK, F_WRLCK start[8] - Starting offset for lock length[8] - Number of bytes to check for the lock If length is 0, check for lock in all bytes starting at the location 'start' through to the end of file pid[4] - PID of the process that wants to take lock/owns the task in case of reply client[4] - Client id of the system that owns the process which has the conflicting lock Signed-off-by: M. Mohan Kumar Signed-off-by: Aneesh Kumar K.V Signed-off-by: Venkateswararao Jujjuri Signed-off-by: Eric Van Hensbergen --- net/9p/client.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'net/9p') diff --git a/net/9p/client.c b/net/9p/client.c index fbd2b195801c..fc1b0579016a 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -1836,3 +1836,37 @@ error: } EXPORT_SYMBOL(p9_client_lock_dotl); + +int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) +{ + int err; + struct p9_client *clnt; + struct p9_req_t *req; + + err = 0; + clnt = fid->clnt; + P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " + "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, + glock->start, glock->length, glock->proc_id, glock->client_id); + + req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, + glock->start, glock->length, glock->proc_id, glock->client_id); + + if (IS_ERR(req)) + return PTR_ERR(req); + + err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, + &glock->start, &glock->length, &glock->proc_id, + &glock->client_id); + if (err) { + p9pdu_dump(1, req->rc); + goto error; + } + P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " + "proc_id %d client_id %s\n", glock->type, glock->start, + glock->length, glock->proc_id, glock->client_id); +error: + p9_free_req(clnt, req); + return err; +} +EXPORT_SYMBOL(p9_client_getlock_dotl); -- cgit v1.2.3