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block/archipelago: Implement bdrv_truncate()

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Signed-off-by: Chrysostomos Nanakos <cnanakos@grnet.gr>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Chrysostomos Nanakos 2014-09-09 20:38:49 +03:00 committed by Kevin Wolf
parent 5366d0c8bc
commit 94c80a438c
1 changed files with 61 additions and 2 deletions
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63
block/archipelago.c
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@ -63,8 +63,6 @@
#include <xseg/xseg.h>
#include <xseg/protocol.h>
#define ARCHIP_FD_READ 0
#define ARCHIP_FD_WRITE 1
#define MAX_REQUEST_SIZE 524288
#define ARCHIPELAGO_OPT_VOLUME "volume"
@ -84,6 +82,7 @@ typedef enum {
ARCHIP_OP_WRITE,
ARCHIP_OP_FLUSH,
ARCHIP_OP_VOLINFO,
ARCHIP_OP_TRUNCATE,
} ARCHIPCmd;
typedef struct ArchipelagoAIOCB {
@ -248,6 +247,7 @@ static void xseg_request_handler(void *state)
}
break;
case ARCHIP_OP_VOLINFO:
case ARCHIP_OP_TRUNCATE:
s->is_signaled = true;
qemu_cond_signal(&s->archip_cond);
break;
@ -995,6 +995,64 @@ static int64_t qemu_archipelago_getlength(BlockDriverState *bs)
return ret;
}
static int qemu_archipelago_truncate(BlockDriverState *bs, int64_t offset)
{
int ret, targetlen;
struct xseg_request *req;
BDRVArchipelagoState *s = bs->opaque;
AIORequestData *reqdata = g_new(AIORequestData, 1);
const char *volname = s->volname;
targetlen = strlen(volname);
req = xseg_get_request(s->xseg, s->srcport, s->mportno, X_ALLOC);
if (!req) {
archipelagolog("Cannot get XSEG request\n");
return err_exit2;
}
ret = xseg_prep_request(s->xseg, req, targetlen, 0);
if (ret < 0) {
archipelagolog("Cannot prepare XSEG request\n");
goto err_exit;
}
char *target = xseg_get_target(s->xseg, req);
if (!target) {
archipelagolog("Cannot get XSEG target\n");
goto err_exit;
}
memcpy(target, volname, targetlen);
req->offset = offset;
req->op = X_TRUNCATE;
reqdata->op = ARCHIP_OP_TRUNCATE;
reqdata->volname = volname;
xseg_set_req_data(s->xseg, req, reqdata);
xport p = xseg_submit(s->xseg, req, s->srcport, X_ALLOC);
if (p == NoPort) {
archipelagolog("Cannot submit XSEG request\n");
goto err_exit;
}
xseg_signal(s->xseg, p);
qemu_mutex_lock(&s->archip_mutex);
while (!s->is_signaled) {
qemu_cond_wait(&s->archip_cond, &s->archip_mutex);
}
s->is_signaled = false;
qemu_mutex_unlock(&s->archip_mutex);
xseg_put_request(s->xseg, req, s->srcport);
g_free(reqdata);
return 0;
err_exit:
xseg_put_request(s->xseg, req, s->srcport);
err_exit2:
g_free(reqdata);
return -EIO;
}
static QemuOptsList qemu_archipelago_create_opts = {
.name = "archipelago-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(qemu_archipelago_create_opts.head),
@ -1024,6 +1082,7 @@ static BlockDriver bdrv_archipelago = {
.bdrv_close = qemu_archipelago_close,
.bdrv_create = qemu_archipelago_create,
.bdrv_getlength = qemu_archipelago_getlength,
.bdrv_truncate = qemu_archipelago_truncate,
.bdrv_aio_readv = qemu_archipelago_aio_readv,
.bdrv_aio_writev = qemu_archipelago_aio_writev,
.bdrv_aio_flush = qemu_archipelago_aio_flush,