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authorM. Mohan Kumar <mohan@in.ibm.com>2010-09-27 02:04:24 -0400
committerEric Van Hensbergen <ericvh@gmail.com>2010-10-28 10:08:47 -0400
commita099027c779068b834f335cfdc3f2bf10f531dd9 (patch)
treeeee43443cce85a03c13b1cfdd25bf451445cf78f /net/9p
parent920e65dc6911da28a58e17f4b683302636fc6d8e (diff)
9p: Implement TLOCK
Synopsis size[4] TLock tag[2] fid[4] flock[n] size[4] RLock tag[2] status[1] Description Tlock is used to acquire/release byte range posix locks on a file identified by given fid. The reply contains status of the lock request flock structure: type[1] - Type of lock: F_RDLCK, F_WRLCK, F_UNLCK flags[4] - Flags could be either of P9_LOCK_FLAGS_BLOCK - Blocked lock request, if there is a conflicting lock exists, wait for that lock to be released. P9_LOCK_FLAGS_RECLAIM - Reclaim lock request, used when client is trying to reclaim a lock after a server restrart (due to crash) start[8] - Starting offset for lock length[8] - Number of bytes to lock If length is 0, lock all bytes starting at the location 'start' through to the end of file pid[4] - PID of the process that wants to take lock client_id[4] - Unique client id status[1] - Status of the lock request, can be P9_LOCK_SUCCESS(0), P9_LOCK_BLOCKED(1), P9_LOCK_ERROR(2) or P9_LOCK_GRACE(3) P9_LOCK_SUCCESS - Request was successful P9_LOCK_BLOCKED - A conflicting lock is held by another process P9_LOCK_ERROR - Error while processing the lock request P9_LOCK_GRACE - Server is in grace period, it can't accept new lock requests in this period (except locks with P9_LOCK_FLAGS_RECLAIM flag set) Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net/9p')
-rw-r--r--net/9p/client.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index 30c4a1b224fb..fbd2b195801c 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1803,3 +1803,36 @@ error:
1803 1803
1804} 1804}
1805EXPORT_SYMBOL(p9_client_mkdir_dotl); 1805EXPORT_SYMBOL(p9_client_mkdir_dotl);
1806
1807int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1808{
1809 int err;
1810 struct p9_client *clnt;
1811 struct p9_req_t *req;
1812
1813 err = 0;
1814 clnt = fid->clnt;
1815 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1816 "start %lld length %lld proc_id %d client_id %s\n",
1817 fid->fid, flock->type, flock->flags, flock->start,
1818 flock->length, flock->proc_id, flock->client_id);
1819
1820 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1821 flock->flags, flock->start, flock->length,
1822 flock->proc_id, flock->client_id);
1823
1824 if (IS_ERR(req))
1825 return PTR_ERR(req);
1826
1827 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1828 if (err) {
1829 p9pdu_dump(1, req->rc);
1830 goto error;
1831 }
1832 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1833error:
1834 p9_free_req(clnt, req);
1835 return err;
1836
1837}
1838EXPORT_SYMBOL(p9_client_lock_dotl);