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authorM. Mohan Kumar <mohan@in.ibm.com>2010-09-27 11:34:24 +0530
committerEric Van Hensbergen <ericvh@gmail.com>2010-10-28 09:08:47 -0500
commita099027c779068b834f335cfdc3f2bf10f531dd9 (patch)
treeeee43443cce85a03c13b1cfdd25bf451445cf78f /include/net
parent920e65dc6911da28a58e17f4b683302636fc6d8e (diff)
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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 'include/net')
-rw-r--r--include/net/9p/9p.h28
-rw-r--r--include/net/9p/client.h1
2 files changed, 29 insertions, 0 deletions
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 55e96057f47..1859a2560cc 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -165,6 +165,8 @@ enum p9_msg_t {
P9_RREADDIR,
P9_TFSYNC = 50,
P9_RFSYNC,
+ P9_TLOCK = 52,
+ P9_RLOCK,
P9_TLINK = 70,
P9_RLINK,
P9_TMKDIR = 72,
@@ -464,6 +466,32 @@ struct p9_iattr_dotl {
u64 mtime_nsec;
};
+#define P9_LOCK_SUCCESS 0
+#define P9_LOCK_BLOCKED 1
+#define P9_LOCK_ERROR 2
+#define P9_LOCK_GRACE 3
+
+#define P9_LOCK_FLAGS_BLOCK 1
+#define P9_LOCK_FLAGS_RECLAIM 2
+
+/* struct p9_flock: POSIX lock structure
+ * @type - type of lock
+ * @flags - lock flags
+ * @start - starting offset of the lock
+ * @length - number of bytes
+ * @proc_id - process id which wants to take lock
+ * @client_id - client id
+ */
+
+struct p9_flock {
+ u8 type;
+ u32 flags;
+ u64 start;
+ u64 length;
+ u32 proc_id;
+ char *client_id;
+};
+
/* Structures for Protocol Operations */
struct p9_tstatfs {
u32 fid;
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 8744e3ad4a0..d7dcb142e3b 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -249,6 +249,7 @@ int p9_client_mknod_dotl(struct p9_fid *oldfid, char *name, int mode,
dev_t rdev, gid_t gid, struct p9_qid *);
int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
gid_t gid, struct p9_qid *);
+int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status);
struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
void p9_client_cb(struct p9_client *c, struct p9_req_t *req);