diff options
| author | M. Mohan Kumar <mohan@in.ibm.com> | 2010-09-08 02:36:52 +0530 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2010-10-20 12:10:58 -0500 |
| commit | 8f35400358488ffa1147e9eab9e2c9cf0efd5e4e (patch) | |
| tree | e605718005a05b35d5b215b882b1d0931156593c /hw/virtio-9p.c | |
| parent | 82cc3ee88ba238ec3ba96f4673d8a184588b82a4 (diff) | |
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>
Diffstat (limited to 'hw/virtio-9p.c')
| -rw-r--r-- | hw/virtio-9p.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c index 20acb5b1e6..8ae233eb80 100644 --- a/hw/virtio-9p.c +++ b/hw/virtio-9p.c @@ -3203,6 +3203,46 @@ 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) { @@ -3466,6 +3506,7 @@ 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, |