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[Qemu-devel] [RFC 04/12] qorum: Add qorum_open().
From: |
Benoît Canet |
Subject: |
[Qemu-devel] [RFC 04/12] qorum: Add qorum_open(). |
Date: |
Thu, 2 Aug 2012 12:16:36 +0200 |
Signed-off-by: Benoit Canet <address@hidden>
---
block/qorum.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/block/qorum.c b/block/qorum.c
index ea2a720..bdf1530 100644
--- a/block/qorum.c
+++ b/block/qorum.c
@@ -48,11 +48,73 @@ struct QorumAIOCB {
int vote_ret;
};
+/* Valid qorum filenames look like
+ * qorum:path/to/a_image:path/to/b_image:path/to/c_image
+ */
+static int qorum_open(BlockDriverState *bs, const char *filename, int flags)
+{
+ BDRVQorumState *s = bs->opaque;
+ int ret, i;
+ char *a, *b, *c, *filenames[3];
+
+ /* Parse the qorum: prefix */
+ if (strncmp(filename, "qorum:", strlen("qorum:"))) {
+ return -EINVAL;
+ }
+ a = g_strdup(filename + strlen("qorum:"));
+
+ /* Find separators */
+ b = strchr(a, ':');
+ if (b == NULL) {
+ return -EINVAL;
+ }
+
+ c = strrchr(a, ':');
+ if (c == NULL) {
+ return -EINVAL;
+ }
+
+ /* Check that filename contains two separate ':' */
+ if (b == c) {
+ return -EINVAL;
+ }
+
+ /* Split string */
+ *b = '\0';
+ *c = '\0';
+
+ filenames[0] = a;
+ filenames[1] = b + 1;
+ filenames[2] = c + 1;
+
+ /* Open files */
+ for (i = 0; i <= 2; i++) {
+ s->bs[i] = bdrv_new("");
+ ret = bdrv_open(s->bs[i], filenames[i], flags, NULL);
+ if (ret < 0) {
+ goto error_exit;
+ }
+ }
+
+ goto clean_exit;
+
+error_exit:
+ for (; i >= 0; i--) {
+ bdrv_delete(s->bs[i]);
+ s->bs[i] = NULL;
+ }
+clean_exit:
+ g_free(a);
+ return ret;
+}
+
static BlockDriver bdrv_qorum = {
.format_name = "qorum",
.protocol_name = "qorum",
.instance_size = sizeof(BDRVQorumState),
+
+ .bdrv_file_open = qorum_open,
};
static void bdrv_qorum_init(void)
--
1.7.9.5
- [Qemu-devel] [RFC 00/12] Qorum disk image corruption resiliency, Benoît Canet, 2012/08/02
- [Qemu-devel] [RFC 04/12] qorum: Add qorum_open().,
Benoît Canet <=
- [Qemu-devel] [RFC 01/12] qorum: Add GPL v2+ heade r file., Benoît Canet, 2012/08/02
- [Qemu-devel] [RFC 06/12] qorum: Add qorum_getlength()., Benoît Canet, 2012/08/02
- [Qemu-devel] [RFC 03/12] qorum: Create BDRVQorumState and BlkDriver and do init., Benoît Canet, 2012/08/02
- [Qemu-devel] [RFC 05/12] qorum: Add qorum_close()., Benoît Canet, 2012/08/02
- [Qemu-devel] [RFC 02/12] qorum: Add QorumSingleAIOCB and QorumAIOCB., Benoît Canet, 2012/08/02
- [Qemu-devel] [RFC 10/12] qorum: Add qorum_aio_readv., Benoît Canet, 2012/08/02