qemu-virtio9p: 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 lock
        If length is 0, lock all bytes starting at the location
        'start' through to the end of file
      proc_id[4] - process id that wants to take lock/owns the task
               in case of reply
      client[4] - Client id of the system that owns the process

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>

1 files changed, 21 insertions, 0 deletions

diff --git a/hw/virtio-9p.h b/hw/virtio-9p.h
index 4555f39..6a68895 100644
--- a/hw/virtio-9p.h
+++ b/hw/virtio-9p.h
@@ -39,6 +39,8 @@ enum {
     P9_RREADDIR,
     P9_TLOCK = 52,
     P9_RLOCK,
+    P9_TGETLOCK = 54,
+    P9_RGETLOCK,
     P9_TLINK = 70,
     P9_RLINK,
     P9_TMKDIR = 72,
@@ -464,6 +466,25 @@ typedef struct V9fsLockState
     V9fsFlock *flock;
 } V9fsLockState;
 
+typedef struct V9fsGetlock
+{
+    uint8_t type;
+    uint64_t start; /* absolute offset */
+    uint64_t length;
+    uint32_t proc_id;
+    V9fsString client_id;
+} V9fsGetlock;
+
+typedef struct V9fsGetlockState
+{
+    V9fsPDU *pdu;
+    size_t offset;
+    struct stat stbuf;
+    V9fsFidState *fidp;
+    V9fsGetlock *glock;
+} V9fsGetlockState;
+
+
 extern size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
                             size_t offset, size_t size, int pack);