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authorJeff Cody <jcody@redhat.com>2014-02-17 11:11:12 -0500
committerStefan Hajnoczi <stefanha@redhat.com>2014-02-28 18:59:06 +0100
commitadccfbcd6020e928db93b2b4faf0dbd05ffbe016 (patch)
treed4968752e491599386f3d43cadc2c8a2b8b48e4c /block
parent1b37b3442f78a77844fdaf7f53e5f04e4ce8f1d6 (diff)
block: gluster - add reopen support.
Gluster does parse open flags in its .bdrv_open() implementation, and the .bdrv_reopen_* implementations need to do the same. A new gluster connection to the image file to be created is established in the .bdrv_reopen_prepare(), and the image file opened with the new flags. If this is successful, then the old image file is closed, and the old connection torn down. The relevant structure pointers in the gluster state structure are updated to the new connection. If it is not successful, then the new file handle and connection is abandoned (if it exists), while the old connection is not modified at all. With reopen supported, block-commit (and offline commit) is now also supported for image files whose base image uses the native gluster protocol driver. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/gluster.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/block/gluster.c b/block/gluster.c
index d09824d750..54ee9b7d93 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -340,6 +340,96 @@ out:
return ret;
}
+typedef struct BDRVGlusterReopenState {
+ struct glfs *glfs;
+ struct glfs_fd *fd;
+} BDRVGlusterReopenState;
+
+
+static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
+ BlockReopenQueue *queue, Error **errp)
+{
+ int ret = 0;
+ BDRVGlusterReopenState *reop_s;
+ GlusterConf *gconf = NULL;
+ int open_flags = 0;
+
+ assert(state != NULL);
+ assert(state->bs != NULL);
+
+ state->opaque = g_malloc0(sizeof(BDRVGlusterReopenState));
+ reop_s = state->opaque;
+
+ qemu_gluster_parse_flags(state->flags, &open_flags);
+
+ gconf = g_malloc0(sizeof(GlusterConf));
+
+ reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename);
+ if (reop_s->glfs == NULL) {
+ ret = -errno;
+ goto exit;
+ }
+
+ reop_s->fd = glfs_open(reop_s->glfs, gconf->image, open_flags);
+ if (reop_s->fd == NULL) {
+ /* reops->glfs will be cleaned up in _abort */
+ ret = -errno;
+ goto exit;
+ }
+
+exit:
+ /* state->opaque will be freed in either the _abort or _commit */
+ qemu_gluster_gconf_free(gconf);
+ return ret;
+}
+
+static void qemu_gluster_reopen_commit(BDRVReopenState *state)
+{
+ BDRVGlusterReopenState *reop_s = state->opaque;
+ BDRVGlusterState *s = state->bs->opaque;
+
+
+ /* close the old */
+ if (s->fd) {
+ glfs_close(s->fd);
+ }
+ if (s->glfs) {
+ glfs_fini(s->glfs);
+ }
+
+ /* use the newly opened image / connection */
+ s->fd = reop_s->fd;
+ s->glfs = reop_s->glfs;
+
+ g_free(state->opaque);
+ state->opaque = NULL;
+
+ return;
+}
+
+
+static void qemu_gluster_reopen_abort(BDRVReopenState *state)
+{
+ BDRVGlusterReopenState *reop_s = state->opaque;
+
+ if (reop_s == NULL) {
+ return;
+ }
+
+ if (reop_s->fd) {
+ glfs_close(reop_s->fd);
+ }
+
+ if (reop_s->glfs) {
+ glfs_fini(reop_s->glfs);
+ }
+
+ g_free(state->opaque);
+ state->opaque = NULL;
+
+ return;
+}
+
#ifdef CONFIG_GLUSTERFS_ZEROFILL
static coroutine_fn int qemu_gluster_co_write_zeroes(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, BdrvRequestFlags flags)
@@ -630,6 +720,9 @@ static BlockDriver bdrv_gluster = {
.instance_size = sizeof(BDRVGlusterState),
.bdrv_needs_filename = true,
.bdrv_file_open = qemu_gluster_open,
+ .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
+ .bdrv_reopen_commit = qemu_gluster_reopen_commit,
+ .bdrv_reopen_abort = qemu_gluster_reopen_abort,
.bdrv_close = qemu_gluster_close,
.bdrv_create = qemu_gluster_create,
.bdrv_getlength = qemu_gluster_getlength,
@@ -654,6 +747,9 @@ static BlockDriver bdrv_gluster_tcp = {
.instance_size = sizeof(BDRVGlusterState),
.bdrv_needs_filename = true,
.bdrv_file_open = qemu_gluster_open,
+ .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
+ .bdrv_reopen_commit = qemu_gluster_reopen_commit,
+ .bdrv_reopen_abort = qemu_gluster_reopen_abort,
.bdrv_close = qemu_gluster_close,
.bdrv_create = qemu_gluster_create,
.bdrv_getlength = qemu_gluster_getlength,
@@ -678,6 +774,9 @@ static BlockDriver bdrv_gluster_unix = {
.instance_size = sizeof(BDRVGlusterState),
.bdrv_needs_filename = true,
.bdrv_file_open = qemu_gluster_open,
+ .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
+ .bdrv_reopen_commit = qemu_gluster_reopen_commit,
+ .bdrv_reopen_abort = qemu_gluster_reopen_abort,
.bdrv_close = qemu_gluster_close,
.bdrv_create = qemu_gluster_create,
.bdrv_getlength = qemu_gluster_getlength,
@@ -702,6 +801,9 @@ static BlockDriver bdrv_gluster_rdma = {
.instance_size = sizeof(BDRVGlusterState),
.bdrv_needs_filename = true,
.bdrv_file_open = qemu_gluster_open,
+ .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
+ .bdrv_reopen_commit = qemu_gluster_reopen_commit,
+ .bdrv_reopen_abort = qemu_gluster_reopen_abort,
.bdrv_close = qemu_gluster_close,
.bdrv_create = qemu_gluster_create,
.bdrv_getlength = qemu_gluster_getlength,