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authorAnthony Liguori <aliguori@us.ibm.com>2010-04-29 17:44:48 +0530
committerAnthony Liguori <aliguori@us.ibm.com>2010-05-03 12:17:38 -0500
commit286d56526e0ab9b7c9f8b487cbb1ccb280aa5a22 (patch)
tree8ea2d0d0b9f2d06cbb6bcdaad8c13ab1272e8fc0 /hw
parent131dcb2521bff704424cdb2ce065dc776fbc89b9 (diff)
virtio-9p: Add fid and qid management support.
Helper APIs for FID and QID management. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw')
-rw-r--r--hw/virtio-9p.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index 7668e52586..4467aea3ff 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -176,6 +176,126 @@ static size_t v9fs_string_size(V9fsString *str)
return str->size;
}
+static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid)
+{
+ V9fsFidState *f;
+
+ for (f = s->fid_list; f; f = f->next) {
+ if (f->fid == fid) {
+ v9fs_do_setuid(s, f->uid);
+ return f;
+ }
+ }
+
+ return NULL;
+}
+
+static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
+{
+ V9fsFidState *f;
+
+ f = lookup_fid(s, fid);
+ if (f) {
+ return NULL;
+ }
+
+ f = qemu_mallocz(sizeof(V9fsFidState));
+
+ f->fid = fid;
+ f->fd = -1;
+ f->dir = NULL;
+
+ f->next = s->fid_list;
+ s->fid_list = f;
+
+ return f;
+}
+
+static int free_fid(V9fsState *s, int32_t fid)
+{
+ V9fsFidState **fidpp, *fidp;
+
+ for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
+ if ((*fidpp)->fid == fid) {
+ break;
+ }
+ }
+
+ if (*fidpp == NULL) {
+ return -ENOENT;
+ }
+
+ fidp = *fidpp;
+ *fidpp = fidp->next;
+
+ if (fidp->fd != -1) {
+ v9fs_do_close(s, fidp->fd);
+ }
+ if (fidp->dir) {
+ v9fs_do_closedir(s, fidp->dir);
+ }
+ v9fs_string_free(&fidp->path);
+ qemu_free(fidp);
+
+ return 0;
+}
+
+#define P9_QID_TYPE_DIR 0x80
+#define P9_QID_TYPE_SYMLINK 0x02
+
+#define P9_STAT_MODE_DIR 0x80000000
+#define P9_STAT_MODE_APPEND 0x40000000
+#define P9_STAT_MODE_EXCL 0x20000000
+#define P9_STAT_MODE_MOUNT 0x10000000
+#define P9_STAT_MODE_AUTH 0x08000000
+#define P9_STAT_MODE_TMP 0x04000000
+#define P9_STAT_MODE_SYMLINK 0x02000000
+#define P9_STAT_MODE_LINK 0x01000000
+#define P9_STAT_MODE_DEVICE 0x00800000
+#define P9_STAT_MODE_NAMED_PIPE 0x00200000
+#define P9_STAT_MODE_SOCKET 0x00100000
+#define P9_STAT_MODE_SETUID 0x00080000
+#define P9_STAT_MODE_SETGID 0x00040000
+#define P9_STAT_MODE_SETVTX 0x00010000
+
+#define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
+ P9_STAT_MODE_SYMLINK | \
+ P9_STAT_MODE_LINK | \
+ P9_STAT_MODE_DEVICE | \
+ P9_STAT_MODE_NAMED_PIPE | \
+ P9_STAT_MODE_SOCKET)
+
+/* This is the algorithm from ufs in spfs */
+static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
+{
+ size_t size;
+
+ size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
+ memcpy(&qidp->path, &stbuf->st_ino, size);
+ qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
+ qidp->type = 0;
+ if (S_ISDIR(stbuf->st_mode)) {
+ qidp->type |= P9_QID_TYPE_DIR;
+ }
+ if (S_ISLNK(stbuf->st_mode)) {
+ qidp->type |= P9_QID_TYPE_SYMLINK;
+ }
+}
+
+static int fid_to_qid(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp)
+{
+ struct stat stbuf;
+ int err;
+
+ err = v9fs_do_lstat(s, &fidp->path, &stbuf);
+ if (err) {
+ return err;
+ }
+
+ stat_to_qid(&stbuf, qidp);
+ return 0;
+}
+
static V9fsPDU *alloc_pdu(V9fsState *s)
{
V9fsPDU *pdu = NULL;
@@ -477,6 +597,9 @@ static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu)
(void) v9fs_do_readlink;
(void) v9fs_do_close;
(void) v9fs_do_closedir;
+ (void) alloc_fid;
+ (void) free_fid;
+ (void) fid_to_qid;
}
static void v9fs_version(V9fsState *s, V9fsPDU *pdu)