Previously, qemu block driver of sheepdog used hard-coded VDI object size.
This patch enables users to handle "block_size_shift" value for
calculating VDI object size.
When you start qemu, you don't need to specify additional command option.
But when you create the VDI which doesn't have default object size
with qemu-img command, you specify block_size_shift option.
If you want to create a VDI of 8MB(1 << 23) object size,
you need to specify following command option.
# qemu-img create -o block_size_shift=23 sheepdog:test1 100M
In addition, when you don't specify qemu-img command option,
a default value of sheepdog cluster is used for creating VDI.
# qemu-img create sheepdog:test2 100M
Signed-off-by: Teruaki Ishizaki <ishizaki.teru...@lab.ntt.co.jp>
---
V3:
- Delete the needless operation of buffer.
- Delete the needless operations of request header
for SD_OP_GET_CLUSTER_DEFAULT.
- Fix coding style problems.
V2:
- Fix coding style problem (white space).
- Add members, store_policy and block_size_shift to struct SheepdogVdiReq
- Initialize request header to use block_size_shift specified by user.
---
block/sheepdog.c | 140 ++++++++++++++++++++++++++++++++++++++-------
include/block/block_int.h | 1 +
2 files changed, 119 insertions(+), 22 deletions(-)
diff --git a/block/sheepdog.c b/block/sheepdog.c
index be3176f..c9f06db 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -37,6 +37,7 @@
#define SD_OP_READ_VDIS 0x15
#define SD_OP_FLUSH_VDI 0x16
#define SD_OP_DEL_VDI 0x17
+#define SD_OP_GET_CLUSTER_DEFAULT 0x18
#define SD_FLAG_CMD_WRITE 0x01
#define SD_FLAG_CMD_COW 0x02
@@ -167,7 +168,8 @@ typedef struct SheepdogVdiReq {
uint32_t base_vdi_id;
uint8_t copies;
uint8_t copy_policy;
- uint8_t reserved[2];
+ uint8_t store_policy;
+ uint8_t block_size_shift;
uint32_t snapid;
uint32_t type;
uint32_t pad[2];
@@ -186,6 +188,21 @@ typedef struct SheepdogVdiRsp {
uint32_t pad[5];
} SheepdogVdiRsp;
+typedef struct SheepdogClusterRsp {
+ uint8_t proto_ver;
+ uint8_t opcode;
+ uint16_t flags;
+ uint32_t epoch;
+ uint32_t id;
+ uint32_t data_length;
+ uint32_t result;
+ uint8_t nr_copies;
+ uint8_t copy_policy;
+ uint8_t block_size_shift;
+ uint8_t __pad1;
+ uint32_t __pad2[6];
+} SheepdogClusterRsp;
+
typedef struct SheepdogInode {
char name[SD_MAX_VDI_LEN];
char tag[SD_MAX_VDI_TAG_LEN];
@@ -1544,6 +1561,7 @@ static int do_sd_create(BDRVSheepdogState *s, uint32_t
*vdi_id, int snapshot,
hdr.vdi_size = s->inode.vdi_size;
hdr.copy_policy = s->inode.copy_policy;
hdr.copies = s->inode.nr_copies;
+ hdr.block_size_shift = s->inode.block_size_shift;
ret = do_req(fd, s->aio_context, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
@@ -1569,9 +1587,11 @@ static int do_sd_create(BDRVSheepdogState *s, uint32_t
*vdi_id, int snapshot,
static int sd_prealloc(const char *filename, Error **errp)
{
BlockDriverState *bs = NULL;
+ BDRVSheepdogState *base = NULL;
uint32_t idx, max_idx;
+ uint32_t object_size;
int64_t vdi_size;
- void *buf = g_malloc0(SD_DATA_OBJ_SIZE);
+ void *buf = NULL;
int ret;
ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
@@ -1585,18 +1605,23 @@ static int sd_prealloc(const char *filename, Error
**errp)
ret = vdi_size;
goto out;
}
- max_idx = DIV_ROUND_UP(vdi_size, SD_DATA_OBJ_SIZE);
+
+ base = bs->opaque;
+ object_size = (UINT32_C(1) << base->inode.block_size_shift);
+ buf = g_malloc0(object_size);
