}
}
}
- } else {
+ } else if (allocate == 2) {
cluster_offset |= QCOW_OFLAG_COMPRESSED |
(uint64_t)compressed_size << (63 - s->cluster_bits);
}
typedef struct QCowAIOCB {
BlockDriverAIOCB common;
int64_t sector_num;
+ QEMUIOVector *qiov;
uint8_t *buf;
+ void *orig_buf;
int nb_sectors;
int n;
uint64_t cluster_offset;
uint8_t *cluster_data;
+ struct iovec hd_iov;
+ QEMUIOVector hd_qiov;
BlockDriverAIOCB *hd_aiocb;
} QCowAIOCB;
int index_in_cluster;
acb->hd_aiocb = NULL;
- if (ret < 0) {
- fail:
- acb->common.cb(acb->common.opaque, ret);
- qemu_aio_release(acb);
- return;
- }
+ if (ret < 0)
+ goto done;
redo:
/* post process the read buffer */
if (acb->nb_sectors == 0) {
/* request completed */
- acb->common.cb(acb->common.opaque, 0);
- qemu_aio_release(acb);
- return;
+ ret = 0;
+ goto done;
}
/* prepare next AIO request */
if (!acb->cluster_offset) {
if (bs->backing_hd) {
/* read from the base image */
- acb->hd_aiocb = bdrv_aio_read(bs->backing_hd,
- acb->sector_num, acb->buf, acb->n, qcow_aio_read_cb, acb);
+ acb->hd_iov.iov_base = (void *)acb->buf;
+ acb->hd_iov.iov_len = acb->n * 512;
+ qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
+ acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num,
+ &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb);
if (acb->hd_aiocb == NULL)
- goto fail;
+ goto done;
} else {
/* Note: in this case, no need to wait */
memset(acb->buf, 0, 512 * acb->n);
} else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) {
/* add AIO support for compressed blocks ? */
if (decompress_cluster(s, acb->cluster_offset) < 0)
- goto fail;
+ goto done;
memcpy(acb->buf,
s->cluster_cache + index_in_cluster * 512, 512 * acb->n);
goto redo;
} else {
if ((acb->cluster_offset & 511) != 0) {
ret = -EIO;
- goto fail;
+ goto done;
}
- acb->hd_aiocb = bdrv_aio_read(s->hd,
+ acb->hd_iov.iov_base = (void *)acb->buf;
+ acb->hd_iov.iov_len = acb->n * 512;
+ qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
+ acb->hd_aiocb = bdrv_aio_readv(s->hd,
(acb->cluster_offset >> 9) + index_in_cluster,
- acb->buf, acb->n, qcow_aio_read_cb, acb);
+ &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb);
if (acb->hd_aiocb == NULL)
- goto fail;
+ goto done;
}
+
+ return;
+
+done:
+ if (acb->qiov->niov > 1) {
+ qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size);
+ qemu_vfree(acb->orig_buf);
+ }
+ acb->common.cb(acb->common.opaque, ret);
+ qemu_aio_release(acb);
}
-static BlockDriverAIOCB *qcow_aio_read(BlockDriverState *bs,
- int64_t sector_num, uint8_t *buf, int nb_sectors,
+static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs,
+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
QCowAIOCB *acb;
return NULL;
acb->hd_aiocb = NULL;
acb->sector_num = sector_num;
- acb->buf = buf;
+ acb->qiov = qiov;
+ if (qiov->niov > 1)
+ acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size);
+ else
+ acb->buf = (uint8_t *)qiov->iov->iov_base;
acb->nb_sectors = nb_sectors;
acb->n = 0;
acb->cluster_offset = 0;
acb->hd_aiocb = NULL;
- if (ret < 0) {
- fail:
- acb->common.cb(acb->common.opaque, ret);
- qemu_aio_release(acb);
- return;
- }
+ if (ret < 0)
+ goto done;
acb->nb_sectors -= acb->n;
acb->sector_num += acb->n;
if (acb->nb_sectors == 0) {
/* request completed */
- acb->common.cb(acb->common.opaque, 0);
- qemu_aio_release(acb);
- return;
+ ret = 0;
+ goto done;
}
index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
index_in_cluster + acb->n);
if (!cluster_offset || (cluster_offset & 511) != 0) {
ret = -EIO;
- goto fail;
+ goto done;
}
if (s->crypt_method) {
if (!acb->cluster_data) {
acb->cluster_data = qemu_mallocz(s->cluster_size);
if (!acb->cluster_data) {
ret = -ENOMEM;
- goto fail;
+ goto done;
}
}
encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf,
} else {
src_buf = acb->buf;
}
- acb->hd_aiocb = bdrv_aio_write(s->hd,
- (cluster_offset >> 9) + index_in_cluster,
- src_buf, acb->n,
- qcow_aio_write_cb, acb);
+
+ acb->hd_iov.iov_base = (void *)src_buf;
+ acb->hd_iov.iov_len = acb->n * 512;
+ qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
+ acb->hd_aiocb = bdrv_aio_writev(s->hd,
+ (cluster_offset >> 9) + index_in_cluster,
+ &acb->hd_qiov, acb->n,
+ qcow_aio_write_cb, acb);
if (acb->hd_aiocb == NULL)
- goto fail;
+ goto done;
+ return;
+
+done:
+ if (acb->qiov->niov > 1)
+ qemu_vfree(acb->orig_buf);
+ acb->common.cb(acb->common.opaque, ret);
+ qemu_aio_release(acb);
}
-static BlockDriverAIOCB *qcow_aio_write(BlockDriverState *bs,
- int64_t sector_num, const uint8_t *buf, int nb_sectors,
+static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVQcowState *s = bs->opaque;
return NULL;
acb->hd_aiocb = NULL;
acb->sector_num = sector_num;
- acb->buf = (uint8_t *)buf;
+ acb->qiov = qiov;
+ if (qiov->niov > 1) {
+ acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size);
+ qemu_iovec_to_buffer(qiov, acb->buf);
+ } else {
+ acb->buf = (uint8_t *)qiov->iov->iov_base;
+ }
acb->nb_sectors = nb_sectors;
acb->n = 0;
header_size = sizeof(header);
backing_filename_len = 0;
if (backing_file) {
- header.backing_file_offset = cpu_to_be64(header_size);
- backing_filename_len = strlen(backing_file);
- header.backing_file_size = cpu_to_be32(backing_filename_len);
- header_size += backing_filename_len;
- header.mtime = cpu_to_be32(0);
+ if (strcmp(backing_file, "fat:")) {
+ header.backing_file_offset = cpu_to_be64(header_size);
+ backing_filename_len = strlen(backing_file);
+ header.backing_file_size = cpu_to_be32(backing_filename_len);
+ header_size += backing_filename_len;
+ } else {
+ /* special backing file for vvfat */
+ backing_file = NULL;
+ }
header.cluster_bits = 9; /* 512 byte cluster to avoid copying
unmodifyed sectors */
header.l2_bits = 12; /* 32 KB L2 tables */
}
BlockDriver bdrv_qcow = {
- "qcow",
- sizeof(BDRVQcowState),
- qcow_probe,
- qcow_open,
- NULL,
- NULL,
- qcow_close,
- qcow_create,
- qcow_flush,
- qcow_is_allocated,
- qcow_set_key,
- qcow_make_empty,
-
- .bdrv_aio_read = qcow_aio_read,
- .bdrv_aio_write = qcow_aio_write,
- .bdrv_aio_cancel = qcow_aio_cancel,
- .aiocb_size = sizeof(QCowAIOCB),
+ .format_name = "qcow",
+ .instance_size = sizeof(BDRVQcowState),
+ .bdrv_probe = qcow_probe,
+ .bdrv_open = qcow_open,
+ .bdrv_close = qcow_close,
+ .bdrv_create = qcow_create,
+ .bdrv_flush = qcow_flush,
+ .bdrv_is_allocated = qcow_is_allocated,
+ .bdrv_set_key = qcow_set_key,
+ .bdrv_make_empty = qcow_make_empty,
+ .bdrv_aio_readv = qcow_aio_readv,
+ .bdrv_aio_writev = qcow_aio_writev,
+ .bdrv_aio_cancel = qcow_aio_cancel,
+ .aiocb_size = sizeof(QCowAIOCB),
.bdrv_write_compressed = qcow_write_compressed,
- .bdrv_get_info = qcow_get_info,
+ .bdrv_get_info = qcow_get_info,
};
projects / qemu / blobdiff