[Qemu-devel] [PATCH 01/02] qemu: virtio-9p: Implement TMKDIR

["M. Mohan Kumar" <mohan@in.ibm.com>]

Synopsis

    size[4] Tmkdir tag[2] fid[4] name[s] mode[4] gid[4]

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

Description

    mkdir asks the file server to create a directory with given name,
    mode and gid. The qid for the new directory is returned with
    the mkdir reply message.

Note: 72 is selected as the opcode for TMKDIR from the reserved list.


Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
---
 hw/virtio-9p-debug.c |   11 +++++++
 hw/virtio-9p.c       |   81 ++++++++++++++++++++++++++++++++++++++++++++++---
 hw/virtio-9p.h       |    2 +
 3 files changed, 89 insertions(+), 5 deletions(-)

diff --git a/hw/virtio-9p-debug.c b/hw/virtio-9p-debug.c
index 1333928..966c3e1 100644
--- a/hw/virtio-9p-debug.c
+++ b/hw/virtio-9p-debug.c
@@ -365,6 +365,17 @@ void pprint_pdu(V9fsPDU *pdu)
         pprint_data(pdu, 1, &offset, ", data");
 #endif
         break;
+    case P9_TMKDIR:
+        fprintf(llogfile, "TMKDIR: (");
+        pprint_int32(pdu, 0, &offset, "fid");
+        pprint_str(pdu, 0, &offset, "name");
+        pprint_int32(pdu, 0, &offset, "mode");
+        pprint_int32(pdu, 0, &offset, "gid");
+        break;
+    case P9_RMKDIR:
+        fprintf(llogfile, "RMKDIR: (");
+        pprint_qid(pdu, 0, &offset, "qid");
+        break;
     case P9_TVERSION:
         fprintf(llogfile, "TVERSION: (");
         pprint_int32(pdu, 0, &offset, "msize");
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index 03c312d..851004d 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -173,15 +173,17 @@ static int v9fs_do_mknod(V9fsState *s, char *name,
     return s->ops->mknod(&s->ctx, name, &cred);
 }
 
-static int v9fs_do_mkdir(V9fsState *s, V9fsCreateState *vs)
+static int v9fs_do_mkdir(V9fsState *s, char *name, mode_t mode,
+                uid_t uid, gid_t gid)
 {
     FsCred cred;
 
     cred_init(&cred);
-    cred.fc_uid = vs->fidp->uid;
-    cred.fc_mode = vs->perm & 0777;
+    cred.fc_uid = uid;
+    cred.fc_gid = gid;
+    cred.fc_mode = mode;
 
-    return s->ops->mkdir(&s->ctx, vs->fullname.data, &cred);
+    return s->ops->mkdir(&s->ctx, name, &cred);
 }
 
 static int v9fs_do_fstat(V9fsState *s, int fd, struct stat *stbuf)
@@ -2110,7 +2112,7 @@ static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
     }
 
     if (vs->perm & P9_STAT_MODE_DIR) {
-        err = v9fs_do_mkdir(s, vs);
+        err = v9fs_do_mkdir(s, vs->fullname.data, vs->mode, vs->fidp->uid, -1);
         v9fs_create_post_mkdir(s, vs, err);
     } else if (vs->perm & P9_STAT_MODE_SYMLINK) {
         err = v9fs_do_symlink(s, vs->fidp, vs->extension.data, 
@@ -2783,6 +2785,74 @@ out:
     qemu_free(vs);
 }
 
+static void v9fs_mkdir_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
+{
+    if (err == -1) {
+        err = -errno;
+        goto out;
+    }
+
+    stat_to_qid(&vs->stbuf, &vs->qid);
+    vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
+    err = vs->offset;
+out:
+    complete_pdu(s, vs->pdu, err);
+    v9fs_string_free(&vs->fullname);
+    v9fs_string_free(&vs->name);
+    qemu_free(vs);
+}
+
+static void v9fs_mkdir_post_mkdir(V9fsState *s, V9fsMkState *vs, int err)
+{
+    if (err == -1) {
+        err = -errno;
+        goto out;
+    }
+
+    err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
+    v9fs_mkdir_post_lstat(s, vs, err);
+    return;
+out:
+    complete_pdu(s, vs->pdu, err);
+    v9fs_string_free(&vs->fullname);
+    v9fs_string_free(&vs->name);
+    qemu_free(vs);
+}
+
+static void v9fs_mkdir(V9fsState *s, V9fsPDU *pdu)
+{
+    int32_t fid;
+    V9fsMkState *vs;
+    int err = 0;
+    V9fsFidState *fidp;
+    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, "dsdd", &fid, &vs->name, &vs->mode,
+        &gid);
+
+    fidp = lookup_fid(s, fid);
+    if (fidp == NULL) {
+        err = -ENOENT;
+        goto out;
+    }
+
+    v9fs_string_sprintf(&vs->fullname, "%s/%s", fidp->path.data, vs->name.data);
+    err = v9fs_do_mkdir(s, vs->fullname.data, vs->mode, fidp->uid, gid);
+    v9fs_mkdir_post_mkdir(s, vs, err);
+    return;
+
+out:
+    complete_pdu(s, vs->pdu, err);
+    v9fs_string_free(&vs->fullname);
+    v9fs_string_free(&vs->name);
+    qemu_free(vs);
+}
+
 typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu);
 
 static pdu_handler_t *pdu_handlers[] = {
@@ -2792,6 +2862,7 @@ static pdu_handler_t *pdu_handlers[] = {
     [P9_TSETATTR] = v9fs_setattr,
     [P9_TSYMLINK] = v9fs_symlink,
     [P9_TMKNOD] = v9fs_mknod,
+    [P9_TMKDIR] = v9fs_mkdir,
     [P9_TVERSION] = v9fs_version,
     [P9_TRENAME] = v9fs_rename,
     [P9_TATTACH] = v9fs_attach,
diff --git a/hw/virtio-9p.h b/hw/virtio-9p.h
index 62d8e43..3819be5 100644
--- a/hw/virtio-9p.h
+++ b/hw/virtio-9p.h
@@ -29,6 +29,8 @@ enum {
     P9_RREADDIR,
     P9_TLINK = 70,
     P9_RLINK,
+    P9_TMKDIR = 72,
+    P9_RMKDIR,
     P9_TVERSION = 100,
     P9_RVERSION,
     P9_TAUTH = 102,
-- 
1.6.6.1