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sheepdog: add discard/trim support for sheepdog

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The 'TRIM' command from VM that is to release underlying data storage for
better thin-provision is already supported by the Sheepdog.

This patch adds the TRIM support at QEMU part.

For older Sheepdog that doesn't support it, we return 0(success) to upper layer.

Cc: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Liu Yuan <tailai.ly@taobao.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Liu Yuan 2013-04-23 14:03:33 +08:00 committed by Stefan Hajnoczi
parent 4fc16838b8
commit cac8f4a60f
1 changed files with 63 additions and 1 deletions
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64
block/sheepdog.c
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@ -27,6 +27,8 @@
#define SD_OP_CREATE_AND_WRITE_OBJ 0x01
#define SD_OP_READ_OBJ 0x02
#define SD_OP_WRITE_OBJ 0x03
/* 0x04 is used internally by Sheepdog */
#define SD_OP_DISCARD_OBJ 0x05
#define SD_OP_NEW_VDI 0x11
#define SD_OP_LOCK_VDI 0x12
@ -269,6 +271,7 @@ enum AIOCBState {
AIOCB_WRITE_UDATA,
AIOCB_READ_UDATA,
AIOCB_FLUSH_CACHE,
AIOCB_DISCARD_OBJ,
};
struct SheepdogAIOCB {
@ -298,6 +301,7 @@ typedef struct BDRVSheepdogState {
char name[SD_MAX_VDI_LEN];
bool is_snapshot;
uint32_t cache_flags;
bool discard_supported;
char *host_spec;
bool is_unix;
@ -656,7 +660,7 @@ static void coroutine_fn aio_read_response(void *opaque)
int ret;
AIOReq *aio_req = NULL;
SheepdogAIOCB *acb;
unsigned long idx;
uint64_t idx;
if (QLIST_EMPTY(&s->inflight_aio_head)) {
goto out;
@ -727,6 +731,21 @@ static void coroutine_fn aio_read_response(void *opaque)
rsp.result = SD_RES_SUCCESS;
}
break;
case AIOCB_DISCARD_OBJ:
switch (rsp.result) {
case SD_RES_INVALID_PARMS:
error_report("sheep(%s) doesn't support discard command",
s->host_spec);
rsp.result = SD_RES_SUCCESS;
s->discard_supported = false;
break;
case SD_RES_SUCCESS:
idx = data_oid_to_idx(aio_req->oid);
s->inode.data_vdi_id[idx] = 0;
break;
default:
break;
}
}
if (rsp.result != SD_RES_SUCCESS) {
@ -1016,6 +1035,9 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
wlen = datalen;
hdr.flags = SD_FLAG_CMD_WRITE | flags;
break;
case AIOCB_DISCARD_OBJ:
hdr.opcode = SD_OP_DISCARD_OBJ;
break;
}
if (s->cache_flags) {
@ -1197,6 +1219,7 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags)
if (flags & BDRV_O_NOCACHE) {
s->cache_flags = SD_FLAG_CMD_DIRECT;
}
s->discard_supported = true;
if (snapid || tag[0] != '\0') {
dprintf("%" PRIx32 " snapshot inode was open.\n", vid);
@ -1662,6 +1685,15 @@ static int coroutine_fn sd_co_rw_vector(void *p)
flags = SD_FLAG_CMD_COW;
}
break;
case AIOCB_DISCARD_OBJ:
/*
* We discard the object only when the whole object is
* 1) allocated 2) trimmed. Otherwise, simply skip it.
*/
if (len != SD_DATA_OBJ_SIZE || inode->data_vdi_id[idx] == 0) {
goto done;
}
break;
default:
break;
}
@ -2107,6 +2139,33 @@ static int sd_load_vmstate(BlockDriverState *bs, uint8_t *data,
}
static coroutine_fn int sd_co_discard(BlockDriverState *bs, int64_t sector_num,
int nb_sectors)
{
SheepdogAIOCB *acb;
QEMUIOVector dummy;
BDRVSheepdogState *s = bs->opaque;
int ret;
if (!s->discard_supported) {
return 0;
}
acb = sd_aio_setup(bs, &dummy, sector_num, nb_sectors);
acb->aiocb_type = AIOCB_DISCARD_OBJ;
acb->aio_done_func = sd_finish_aiocb;
ret = sd_co_rw_vector(acb);
if (ret <= 0) {
qemu_aio_release(acb);
return ret;
}
qemu_coroutine_yield();
return acb->ret;
}
static QEMUOptionParameter sd_create_options[] = {
{
.name = BLOCK_OPT_SIZE,
@ -2139,6 +2198,7 @@ static BlockDriver bdrv_sheepdog = {
.bdrv_co_readv = sd_co_readv,
.bdrv_co_writev = sd_co_writev,
.bdrv_co_flush_to_disk = sd_co_flush_to_disk,
.bdrv_co_discard = sd_co_discard,
.bdrv_snapshot_create = sd_snapshot_create,
.bdrv_snapshot_goto = sd_snapshot_goto,
@ -2164,6 +2224,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
.bdrv_co_readv = sd_co_readv,
.bdrv_co_writev = sd_co_writev,
.bdrv_co_flush_to_disk = sd_co_flush_to_disk,
.bdrv_co_discard = sd_co_discard,
.bdrv_snapshot_create = sd_snapshot_create,
.bdrv_snapshot_goto = sd_snapshot_goto,
@ -2189,6 +2250,7 @@ static BlockDriver bdrv_sheepdog_unix = {
.bdrv_co_readv = sd_co_readv,
.bdrv_co_writev = sd_co_writev,
.bdrv_co_flush_to_disk = sd_co_flush_to_disk,
.bdrv_co_discard = sd_co_discard,
.bdrv_snapshot_create = sd_snapshot_create,
.bdrv_snapshot_goto = sd_snapshot_goto,