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[virtio-9p] Define and implement TSYMLINK for 9P2000.L

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This patch implements creating a symlink for TSYMLINK request
and responds with RSYMLINK. In the case of error, we return RERROR.

SYNOPSIS

    size[4] Tsymlink tag[2] fid[4] name[s] symtgt[s] gid[4]

    size[4] Rsymlink tag[2] qid[13]

    DESCRIPTION

    Create a symbolic link named 'name' pointing to 'symtgt'.
    gid represents the effective group id of the caller.
    The  permissions of a symbolic link are irrelevant hence it is omitted
    from the protocol.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
This commit is contained in:
Venkateswararao Jujjuri (JV) 2010-06-09 14:02:08 -07:00 • committed by Aneesh Kumar K.V
parent b2c224be19
commit 08c60fc9cd
3 changed files with 97 additions and 6 deletions
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78
hw/virtio-9p.c
View file

@ -200,15 +200,16 @@ static int v9fs_do_open2(V9fsState *s, V9fsCreateState *vs)
return s->ops->open2(&s->ctx, vs->fullname.data, flags, &cred);
}
static int v9fs_do_symlink(V9fsState *s, V9fsCreateState *vs)
static int v9fs_do_symlink(V9fsState *s, V9fsFidState *fidp,
const char *oldpath, const char *newpath, gid_t gid)
{
FsCred cred;
cred_init(&cred);
cred.fc_uid = vs->fidp->uid;
cred.fc_mode = vs->perm | 0777;
cred.fc_uid = fidp->uid;
cred.fc_gid = gid;
cred.fc_mode = 0777;
return s->ops->symlink(&s->ctx, vs->extension.data, vs->fullname.data,
&cred);
return s->ops->symlink(&s->ctx, oldpath, newpath, &cred);
}
static int v9fs_do_link(V9fsState *s, V9fsString *oldpath, V9fsString *newpath)
@ -2212,7 +2213,8 @@ static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
err = v9fs_do_mkdir(s, vs);
v9fs_create_post_mkdir(s, vs, err);
} else if (vs->perm & P9_STAT_MODE_SYMLINK) {
err = v9fs_do_symlink(s, vs);
err = v9fs_do_symlink(s, vs->fidp, vs->extension.data,
vs->fullname.data, -1);
v9fs_create_post_perms(s, vs, err);
} else if (vs->perm & P9_STAT_MODE_LINK) {
int32_t nfid = atoi(vs->extension.data);
@ -2301,6 +2303,69 @@ out:
qemu_free(vs);
}
static void v9fs_post_symlink(V9fsState *s, V9fsSymlinkState *vs, int err)
{
if (err == 0) {
stat_to_qid(&vs->stbuf, &vs->qid);
vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
err = vs->offset;
} else {
err = -errno;
}
complete_pdu(s, vs->pdu, err);
v9fs_string_free(&vs->name);
v9fs_string_free(&vs->symname);
v9fs_string_free(&vs->fullname);
qemu_free(vs);
}
static void v9fs_symlink_post_do_symlink(V9fsState *s, V9fsSymlinkState *vs,
int err)
{
if (err) {
goto out;
}
err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
out:
v9fs_post_symlink(s, vs, err);
}
static void v9fs_symlink(V9fsState *s, V9fsPDU *pdu)
{
int32_t dfid;
V9fsSymlinkState *vs;
int err = 0;
gid_t gid;
vs = qemu_malloc(sizeof(*vs));
vs->pdu = pdu;
vs->offset = 7;
v9fs_string_init(&vs->fullname);
pdu_unmarshal(vs->pdu, vs->offset, "dssd", &dfid, &vs->name,
&vs->symname, &gid);
vs->dfidp = lookup_fid(s, dfid);
if (vs->dfidp == NULL) {
err = -EINVAL;
goto out;
}
v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->dfidp->path.data,
vs->name.data);
err = v9fs_do_symlink(s, vs->dfidp, vs->symname.data,
vs->fullname.data, gid);
v9fs_symlink_post_do_symlink(s, vs, err);
return;
out:
complete_pdu(s, vs->pdu, err);
v9fs_string_free(&vs->name);
v9fs_string_free(&vs->symname);
qemu_free(vs);
}
static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
{
/* A nop call with no return */
@ -2718,6 +2783,7 @@ static pdu_handler_t *pdu_handlers[] = {
#endif
[P9_TFLUSH] = v9fs_flush,
[P9_TLINK] = v9fs_link,
[P9_TSYMLINK] = v9fs_symlink,
[P9_TCREATE] = v9fs_create,
[P9_TWRITE] = v9fs_write,
[P9_TWSTAT] = v9fs_wstat,