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 --- include/net/9p/9p.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'include/net/9p/9p.h') diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h index 1859a2560cc5..6367a71d84fc 100644 --- a/include/net/9p/9p.h +++ b/include/net/9p/9p.h @@ -167,6 +167,8 @@ enum p9_msg_t { P9_RFSYNC, P9_TLOCK = 52, P9_RLOCK, + P9_TGETLOCK = 54, + P9_RGETLOCK, P9_TLINK = 70, P9_RLINK, P9_TMKDIR = 72, @@ -492,6 +494,22 @@ struct p9_flock { char *client_id; }; +/* struct p9_getlock: getlock structure + * @type - type of lock + * @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_getlock { + u8 type; + u64 start; + u64 length; + u32 proc_id; + char *client_id; +}; + /* Structures for Protocol Operations */ struct p9_tstatfs { u32 fid; -- cgit v1.2.3