[Qemu-devel] [RFC V4 3/9] quorum: Add quorum_open() and quorum_close().

["Benoît Canet" <benoit.canet@gmail.com>]

Valid quorum resources look like:
quorum:threshold/total:path/to/image_1: ... :path/to/image_total

'\' can escape the ':' character.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
---
 block/quorum.c |  110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)

diff --git a/block/quorum.c b/block/quorum.c
index 19a9a44..70e7216 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -52,11 +52,121 @@ struct QuorumAIOCB {
     int vote_ret;
 };
 
+/* Valid quorum resources look like
+ * quorum:threshold/total:path/to/image_1: ... :path/to/image_total
+ */
+static int quorum_open(BlockDriverState *bs, const char *filename, int flags)
+{
+    BDRVQuorumState *s = bs->opaque;
+    int i, j, len, ret = 0;
+    char *a, *b, *names;
+    bool escape;
+
+    /* Parse the quorum: prefix */
+    if (strncmp(filename, "quorum:", strlen("quorum:"))) {
+        return -EINVAL;
+    }
+
+    filename += strlen("quorum:");
+
+    /* Get n */
+    errno = 0;
+    s->threshold = strtoul(filename, &a, 10);
+    if (*a != '/' || errno) {
+        return -EINVAL;
+    }
+    a++;
+
+    /* Get m */
+    errno = 0;
+    s->total = strtoul(a, &b, 10);
+    if (*b != ':' || errno) {
+        return -EINVAL;
+    }
+    b++;
+
+    if (s->threshold < 1 || s->total < 2) {
+        return -EINVAL;
+    }
+
+    if (s->threshold > s->total) {
+        return -EINVAL;
+    }
+
+    s->bs = g_malloc0(sizeof(BlockDriverState *) * s->total);
+    /* Two allocations for all filenames: simpler to free */
+    s->filenames = g_malloc0(sizeof(char *) * s->total);
+    names = g_strdup(b);
+
+    /* Get the filenames pointers */
+    escape = false;
+    s->filenames[0] = names;
+    len = strlen(names);
+    for (i = 0, j = 1; i < len && j < s->total; i++) {
+        if (!escape && names[i] == ':') {
+            names[i] = '\0';
+            s->filenames[j] = names + i + 1;
+            j++;
+        }
+
+        escape = !escape && names[i] == '\\';
+    }
+
+    if (j != s->total) {
+        ret = -EINVAL;
+        goto free_exit;
+    }
+
+    /* Open files */
+    for (i = 0; i < s->total; i++) {
+        s->bs[i] = bdrv_new("");
+        ret = bdrv_open(s->bs[i], s->filenames[i], flags, NULL);
+        if (ret < 0) {
+            goto error_exit;
+        }
+    }
+
+    goto exit;
+
+error_exit:
+    for (; i >= 0; i--) {
+        bdrv_delete(s->bs[i]);
+        s->bs[i] = NULL;
+    }
+free_exit:
+    g_free(s->filenames[0]);
+    g_free(s->filenames);
+    s->filenames = NULL;
+    g_free(s->bs);
+exit:
+    return ret;
+}
+
+static void quorum_close(BlockDriverState *bs)
+{
+    BDRVQuorumState *s = bs->opaque;
+    int i;
+
+    for (i = 0; i < s->total; i++) {
+        /* Ensure writes reach stable storage */
+        bdrv_flush(s->bs[i]);
+        bdrv_delete(s->bs[i]);
+    }
+
+    g_free(s->filenames[0]);
+    g_free(s->filenames);
+    s->filenames = NULL;
+    g_free(s->bs);
+}
+
 static BlockDriver bdrv_quorum = {
     .format_name        = "quorum",
     .protocol_name      = "quorum",
 
     .instance_size      = sizeof(BDRVQuorumState),
+
+    .bdrv_file_open     = quorum_open,
+    .bdrv_close         = quorum_close,
 };
 
 static void bdrv_quorum_init(void)
-- 
1.7.9.5