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[virtio-9p] qemu: virtio-9p: Implement LOPEN

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Implement 9p2000.L version of open(LOPEN) interface in qemu 9p server.

For LOPEN, no need to convert the flags to and from 9p mode to VFS mode.

Synopsis:

    size[4] Tlopen tag[2] fid[4] mode[4]

    size[4] Rlopen tag[2] qid[13] iounit[4]

Current qemu 9p server does not support following flags:
    O_NOCTTY, O_NONBLOCK, O_ASYNC & O_CLOEXEC

[Fix mode format - jvrao@linux.vnet.ibm.com]

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
This commit is contained in:
M. Mohan Kumar 2010-06-22 19:47:04 +05:30 committed by Aneesh Kumar K.V
parent c7b4b0b302
commit 771e9d4c1c
2 changed files with 31 additions and 5 deletions
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32
hw/virtio-9p.c
View File

@ -1621,8 +1621,19 @@ out:
qemu_free(vs);
}
static inline int valid_flags(int flag)
{
if (flag & O_NOCTTY || flag & O_NONBLOCK || flag & O_ASYNC ||
flag & O_CLOEXEC)
return 0;
else
return 1;
}
static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err)
{
int flags;
if (err) {
err = -errno;
goto out;
@ -1634,8 +1645,16 @@ static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err)
vs->fidp->dir = v9fs_do_opendir(s, &vs->fidp->path);
v9fs_open_post_opendir(s, vs, err);
} else {
vs->fidp->fd = v9fs_do_open(s, &vs->fidp->path,
omode_to_uflags(vs->mode));
if (s->proto_version == V9FS_PROTO_2000L) {
if (!valid_flags(vs->mode)) {
err = -EINVAL;
goto out;
}
flags = vs->mode;
} else {
flags = omode_to_uflags(vs->mode);
}
vs->fidp->fd = v9fs_do_open(s, &vs->fidp->path, flags);
v9fs_open_post_open(s, vs, err);
}
return;
@ -1650,12 +1669,16 @@ static void v9fs_open(V9fsState *s, V9fsPDU *pdu)
V9fsOpenState *vs;
ssize_t err = 0;
vs = qemu_malloc(sizeof(*vs));
vs->pdu = pdu;
vs->offset = 7;
vs->mode = 0;
pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode);
if (s->proto_version == V9FS_PROTO_2000L) {
pdu_unmarshal(vs->pdu, vs->offset, "dd", &fid, &vs->mode);
} else {
pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode);
}
vs->fidp = lookup_fid(s, fid);
if (vs->fidp == NULL) {
@ -3076,6 +3099,7 @@ static pdu_handler_t *pdu_handlers[] = {
[P9_TRENAME] = v9fs_rename,
[P9_TMKDIR] = v9fs_mkdir,
[P9_TVERSION] = v9fs_version,
[P9_TLOPEN] = v9fs_open,
[P9_TATTACH] = v9fs_attach,
[P9_TSTAT] = v9fs_stat,
[P9_TWALK] = v9fs_walk,

4
hw/virtio-9p.h
View File

@ -15,6 +15,8 @@
enum {
P9_TSTATFS = 8,
P9_RSTATFS,
P9_TLOPEN = 12,
P9_RLOPEN,
P9_TLCREATE = 14,
P9_RLCREATE,
P9_TSYMLINK = 16,
@ -259,7 +261,7 @@ typedef struct V9fsWalkState {
typedef struct V9fsOpenState {
V9fsPDU *pdu;
size_t offset;
int8_t mode;
int32_t mode;
V9fsFidState *fidp;
V9fsQID qid;
struct stat stbuf;