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[Qemu-devel] [PATCH] nvme: Support image creation
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH] nvme: Support image creation |
Date: |
Wed, 13 Jun 2018 15:46:55 +0800 |
Similar to the host_device's implementation, we check the requested
length against the namespace size.
Truncation is necessary to make qcow2 creation work.
Signed-off-by: Fam Zheng <address@hidden>
---
block/nvme.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
diff --git a/block/nvme.c b/block/nvme.c
index 6f71122bf5..ec3d18e790 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -21,6 +21,7 @@
#include "qemu/option.h"
#include "qemu/vfio-helpers.h"
#include "block/block_int.h"
+#include "sysemu/block-backend.h"
#include "trace.h"
#include "block/nvme.h"
@@ -1154,6 +1155,73 @@ static void nvme_unregister_buf(BlockDriverState *bs,
void *host)
qemu_vfio_dma_unmap(s->vfio, host);
}
+static QemuOptsList nvme_create_opts = {
+ .name = "nvme-create-opts",
+ .head = QTAILQ_HEAD_INITIALIZER(nvme_create_opts.head),
+ .desc = {
+ {
+ .name = BLOCK_OPT_SIZE,
+ .type = QEMU_OPT_SIZE,
+ .help = "Virtual disk size"
+ },
+ { /* end of list */ }
+ }
+};
+
+static int coroutine_fn nvme_co_create_opts(const char *filename, QemuOpts
*opts,
+ Error **errp)
+{
+ int ret = 0;
+ BlockDriverState *bs = NULL;
+ int64_t size;
+
+ if (strncmp(filename, "nvme://", strlen("nvme://"))) {
+ error_setg(errp, "Invalid filename (must start with \"nvme://\")");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ bs = bdrv_open(filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL, errp);
+ if (!bs) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
+
+ if (size < 0 || bdrv_getlength(bs) < size) {
+ error_setg(errp, "Invalid image size");
+ ret = -EINVAL;
+ }
+
+out:
+ bdrv_unref(bs);
+ /* Hold breath for a little while before letting image format creation run.
+ * The problem is when testing with Intel P3700, the controller doesn't
+ * like the immediate open after close, as a result, nvme_init() will fail.
+ * This works around that.
+ **/
+ g_usleep(2000000);
+ return ret;
+}
+
+static int nvme_truncate(BlockDriverState *bs, int64_t offset,
+ PreallocMode prealloc, Error **errp)
+{
+ if (prealloc != PREALLOC_MODE_OFF) {
+ error_setg(errp, "Preallocation mode '%s' unsupported",
+ PreallocMode_str(prealloc));
+ return -ENOTSUP;
+ }
+
+ if (offset > nvme_getlength(bs)) {
+ error_setg(errp, "Cannot grow device files");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static BlockDriver bdrv_nvme = {
.format_name = "nvme",
.protocol_name = "nvme",
@@ -1180,6 +1248,10 @@ static BlockDriver bdrv_nvme = {
.bdrv_register_buf = nvme_register_buf,
.bdrv_unregister_buf = nvme_unregister_buf,
+
+ .create_opts = &nvme_create_opts,
+ .bdrv_co_create_opts = nvme_co_create_opts,
+ .bdrv_truncate = nvme_truncate,
};
static void bdrv_nvme_init(void)
--
2.17.0
- [Qemu-devel] [PATCH] nvme: Support image creation,
Fam Zheng <=