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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>
This commit is contained in:
M. Mohan Kumar 2010-09-08 02:36:52 +05:30 committed by Anthony Liguori
parent 82cc3ee88b
commit 8f35400358
3 changed files with 79 additions and 0 deletions
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17
hw/virtio-9p-debug.c
View File

@ -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;

41
hw/virtio-9p.c
View File

@ -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,

21
hw/virtio-9p.h
View File

@ -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);