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 <mo...@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
---
hw/virtio-9p-debug.c | 17 +++++++++++++++++
hw/virtio-9p.c | 41 +++++++++++++++++++++++++++++++++++++++++
hw/virtio-9p.h | 21 +++++++++++++++++++++
3 files changed, 79 insertions(+), 0 deletions(-)
diff --git a/hw/virtio-9p-debug.c b/hw/virtio-9p-debug.c
index 045774f..85c9900 100644
--- a/hw/virtio-9p-debug.c
+++ b/hw/virtio-9p-debug.c
@@ -602,6 +602,23 @@ void pprint_pdu(V9fsPDU *pdu)
fprintf(llogfile, "RLOCK: (");
pprint_int8(pdu, 0, &offset, "status");
break;
+ case P9_TGETLOCK:
+ fprintf(llogfile, "TGETLOCK: (");
+ pprint_int32(pdu, 0, &offset, "fid");
+ pprint_int8(pdu, 0, &offset, ", type");
+ pprint_int64(pdu, 0, &offset, ", start");
+ pprint_int64(pdu, 0, &offset, ", length");
+ pprint_int32(pdu, 0, &offset, ", proc_id");
+ pprint_str(pdu, 0, &offset, ", client_id");
+ break;
+ case P9_RGETLOCK:
+ fprintf(llogfile, "RGETLOCK: (");
+ pprint_int8(pdu, 0, &offset, "type");
+ pprint_int64(pdu, 0, &offset, ", start");
+ pprint_int64(pdu, 0, &offset, ", length");
+ pprint_int32(pdu, 0, &offset, ", proc_id");
+ pprint_str(pdu, 0, &offset, ", client_id");
+ break;
default:
fprintf(llogfile, "unknown(%d): (", pdu->id);
break;
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index 606604b..33718ea 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -3201,6 +3201,46 @@ out:
qemu_free(vs);
}
+/*
+ * When a TGETLOCK request comes, always return success because all lock
+ * handling is done by client's VFS layer.
+ */
+
+static void v9fs_getlock(V9fsState *s, V9fsPDU *pdu)
+{
+ int32_t fid, err = 0;
+ V9fsGetlockState *vs;
+
+ vs = qemu_mallocz(sizeof(*vs));
+ vs->pdu = pdu;
+ vs->offset = 7;
+
+ vs->glock = qemu_malloc(sizeof(*vs->glock));
+ pdu_unmarshal(vs->pdu, vs->offset, "dbqqds", &fid, &vs->glock->type,
+ &vs->glock->start, &vs->glock->length, &vs->glock->proc_id,
+ &vs->glock->client_id);
+
+ vs->fidp = lookup_fid(s, fid);
+ if (vs->fidp == NULL) {
+ err = -ENOENT;
+ goto out;
+ }
+
+ err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
+ if (err < 0) {
+ err = -errno;
+ goto out;
+ }
+ vs->glock->type = F_UNLCK;
+ vs->offset += pdu_marshal(vs->pdu, vs->offset, "bqqds", vs->glock->type,
+ vs->glock->start, vs->glock->length, vs->glock->proc_id,
+ &vs->glock->client_id);
+out:
+ complete_pdu(s, vs->pdu, err);
+ qemu_free(vs->glock);
+ qemu_free(vs);
+}
+
static void v9fs_mkdir_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
{
if (err == -1) {
@@ -3464,6 +3504,7 @@ static pdu_handler_t *pdu_handlers[] = {
[P9_TMKNOD] = v9fs_mknod,
[P9_TRENAME] = v9fs_rename,
[P9_TLOCK] = v9fs_lock,
+ [P9_TGETLOCK] = v9fs_getlock,
[P9_TMKDIR] = v9fs_mkdir,
[P9_TVERSION] = v9fs_version,
[P9_TLOPEN] = v9fs_open,
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);
--
1.7.0.4
