mirror of
https://github.com/xemu-project/xemu.git
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qcow2: Removed QCowAIOCB entirely
Signed-off-by: Frediano Ziglio <freddy77@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Frediano Ziglio
Kevin Wolf
parent
5ebaa27e9a
commit
3fc48d0983
207
block/qcow2.c
207
block/qcow2.c
@ -376,83 +376,77 @@ int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
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return n1;
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}
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typedef struct QCowAIOCB {
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BlockDriverState *bs;
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int64_t sector_num;
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QEMUIOVector *qiov;
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int remaining_sectors;
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uint64_t bytes_done;
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uint8_t *cluster_data;
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QEMUIOVector hd_qiov;
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} QCowAIOCB;
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/*
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* Returns 0 when the request is completed successfully, 1 when there is still
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* a part left to do and -errno in error cases.
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*/
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static int qcow2_aio_read_cb(QCowAIOCB *acb)
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static int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
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int remaining_sectors, QEMUIOVector *qiov)
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{
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BlockDriverState *bs = acb->bs;
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BDRVQcowState *s = bs->opaque;
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int index_in_cluster, n1;
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int ret;
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int cur_nr_sectors; /* number of sectors in current iteration */
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uint64_t cluster_offset = 0;
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uint64_t bytes_done = 0;
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QEMUIOVector hd_qiov;
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uint8_t *cluster_data = NULL;
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while (acb->remaining_sectors != 0) {
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qemu_iovec_init(&hd_qiov, qiov->niov);
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qemu_co_mutex_lock(&s->lock);
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while (remaining_sectors != 0) {
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/* prepare next request */
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cur_nr_sectors = acb->remaining_sectors;
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cur_nr_sectors = remaining_sectors;
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if (s->crypt_method) {
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cur_nr_sectors = MIN(cur_nr_sectors,
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QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors);
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}
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ret = qcow2_get_cluster_offset(bs, acb->sector_num << 9,
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ret = qcow2_get_cluster_offset(bs, sector_num << 9,
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&cur_nr_sectors, &cluster_offset);
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if (ret < 0) {
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return ret;
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goto fail;
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}
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index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
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index_in_cluster = sector_num & (s->cluster_sectors - 1);
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qemu_iovec_reset(&acb->hd_qiov);
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qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done,
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
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cur_nr_sectors * 512);
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if (!cluster_offset) {
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if (bs->backing_hd) {
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/* read from the base image */
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n1 = qcow2_backing_read1(bs->backing_hd, &acb->hd_qiov,
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acb->sector_num, cur_nr_sectors);
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n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov,
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sector_num, cur_nr_sectors);
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if (n1 > 0) {
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BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
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qemu_co_mutex_unlock(&s->lock);
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ret = bdrv_co_readv(bs->backing_hd, acb->sector_num,
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n1, &acb->hd_qiov);
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ret = bdrv_co_readv(bs->backing_hd, sector_num,
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n1, &hd_qiov);
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qemu_co_mutex_lock(&s->lock);
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if (ret < 0) {
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return ret;
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goto fail;
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}
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}
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} else {
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/* Note: in this case, no need to wait */
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qemu_iovec_memset(&acb->hd_qiov, 0, 512 * cur_nr_sectors);
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qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors);
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}
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} else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
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/* add AIO support for compressed blocks ? */
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ret = qcow2_decompress_cluster(bs, cluster_offset);
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if (ret < 0) {
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return ret;
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goto fail;
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}
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qemu_iovec_from_buffer(&acb->hd_qiov,
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qemu_iovec_from_buffer(&hd_qiov,
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s->cluster_cache + index_in_cluster * 512,
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512 * cur_nr_sectors);
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} else {
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if ((cluster_offset & 511) != 0) {
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return -EIO;
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ret = -EIO;
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goto fail;
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}
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if (s->crypt_method) {
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@ -460,15 +454,15 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
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* For encrypted images, read everything into a temporary
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* contiguous buffer on which the AES functions can work.
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*/
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if (!acb->cluster_data) {
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acb->cluster_data =
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if (!cluster_data) {
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cluster_data =
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g_malloc0(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
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}
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assert(cur_nr_sectors <=
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QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors);
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qemu_iovec_reset(&acb->hd_qiov);
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qemu_iovec_add(&acb->hd_qiov, acb->cluster_data,
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_add(&hd_qiov, cluster_data,
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512 * cur_nr_sectors);
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}
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@ -476,63 +470,32 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
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qemu_co_mutex_unlock(&s->lock);
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ret = bdrv_co_readv(bs->file,
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(cluster_offset >> 9) + index_in_cluster,
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cur_nr_sectors, &acb->hd_qiov);
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cur_nr_sectors, &hd_qiov);
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qemu_co_mutex_lock(&s->lock);
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if (ret < 0) {
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return ret;
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goto fail;
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}
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if (s->crypt_method) {
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qcow2_encrypt_sectors(s, acb->sector_num, acb->cluster_data,
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acb->cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key);
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qemu_iovec_reset(&acb->hd_qiov);
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qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done,
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qcow2_encrypt_sectors(s, sector_num, cluster_data,
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cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key);
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
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cur_nr_sectors * 512);
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qemu_iovec_from_buffer(&acb->hd_qiov, acb->cluster_data,
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qemu_iovec_from_buffer(&hd_qiov, cluster_data,
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512 * cur_nr_sectors);
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}
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}
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acb->remaining_sectors -= cur_nr_sectors;
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acb->sector_num += cur_nr_sectors;
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acb->bytes_done += cur_nr_sectors * 512;
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remaining_sectors -= cur_nr_sectors;
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sector_num += cur_nr_sectors;
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bytes_done += cur_nr_sectors * 512;
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}
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ret = 0;
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return 0;
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}
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static QCowAIOCB *qcow2_aio_setup(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb,
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void *opaque, QCowAIOCB *acb)
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{
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memset(acb, 0, sizeof(*acb));
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acb->bs = bs;
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acb->sector_num = sector_num;
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acb->qiov = qiov;
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qemu_iovec_init(&acb->hd_qiov, qiov->niov);
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acb->bytes_done = 0;
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acb->remaining_sectors = nb_sectors;
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return acb;
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}
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static int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov)
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{
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BDRVQcowState *s = bs->opaque;
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QCowAIOCB acb;
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int ret;
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qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, NULL, NULL, &acb);
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qemu_co_mutex_lock(&s->lock);
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do {
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ret = qcow2_aio_read_cb(&acb);
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} while (ret > 0);
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fail:
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qemu_co_mutex_unlock(&s->lock);
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qemu_iovec_destroy(&acb.hd_qiov);
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qemu_iovec_destroy(&hd_qiov);
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return ret;
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}
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@ -552,13 +515,11 @@ static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m)
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}
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}
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/*
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* Returns 0 when the request is completed successfully, 1 when there is still
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* a part left to do and -errno in error cases.
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*/
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static int qcow2_aio_write_cb(QCowAIOCB *acb)
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static int qcow2_co_writev(BlockDriverState *bs,
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int64_t sector_num,
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int remaining_sectors,
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QEMUIOVector *qiov)
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{
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BlockDriverState *bs = acb->bs;
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BDRVQcowState *s = bs->opaque;
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int index_in_cluster;
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int n_end;
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@ -566,47 +527,56 @@ static int qcow2_aio_write_cb(QCowAIOCB *acb)
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int cur_nr_sectors; /* number of sectors in current iteration */
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QCowL2Meta l2meta;
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uint64_t cluster_offset;
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QEMUIOVector hd_qiov;
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uint64_t bytes_done = 0;
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uint8_t *cluster_data = NULL;
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l2meta.nb_clusters = 0;
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qemu_co_queue_init(&l2meta.dependent_requests);
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while (acb->remaining_sectors != 0) {
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qemu_iovec_init(&hd_qiov, qiov->niov);
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index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
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n_end = index_in_cluster + acb->remaining_sectors;
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s->cluster_cache_offset = -1; /* disable compressed cache */
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qemu_co_mutex_lock(&s->lock);
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while (remaining_sectors != 0) {
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index_in_cluster = sector_num & (s->cluster_sectors - 1);
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n_end = index_in_cluster + remaining_sectors;
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if (s->crypt_method &&
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n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) {
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n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors;
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}
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ret = qcow2_alloc_cluster_offset(bs, acb->sector_num << 9,
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ret = qcow2_alloc_cluster_offset(bs, sector_num << 9,
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index_in_cluster, n_end, &cur_nr_sectors, &l2meta);
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if (ret < 0) {
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return ret;
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goto fail;
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}
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cluster_offset = l2meta.cluster_offset;
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assert((cluster_offset & 511) == 0);
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qemu_iovec_reset(&acb->hd_qiov);
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qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done,
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
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cur_nr_sectors * 512);
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if (s->crypt_method) {
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if (!acb->cluster_data) {
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acb->cluster_data = g_malloc0(QCOW_MAX_CRYPT_CLUSTERS *
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if (!cluster_data) {
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cluster_data = g_malloc0(QCOW_MAX_CRYPT_CLUSTERS *
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s->cluster_size);
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}
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assert(acb->hd_qiov.size <=
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assert(hd_qiov.size <=
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QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
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qemu_iovec_to_buffer(&acb->hd_qiov, acb->cluster_data);
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qemu_iovec_to_buffer(&hd_qiov, cluster_data);
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qcow2_encrypt_sectors(s, acb->sector_num, acb->cluster_data,
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acb->cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key);
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qcow2_encrypt_sectors(s, sector_num, cluster_data,
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cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key);
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qemu_iovec_reset(&acb->hd_qiov);
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qemu_iovec_add(&acb->hd_qiov, acb->cluster_data,
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_add(&hd_qiov, cluster_data,
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cur_nr_sectors * 512);
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}
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@ -614,10 +584,10 @@ static int qcow2_aio_write_cb(QCowAIOCB *acb)
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qemu_co_mutex_unlock(&s->lock);
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ret = bdrv_co_writev(bs->file,
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(cluster_offset >> 9) + index_in_cluster,
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cur_nr_sectors, &acb->hd_qiov);
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cur_nr_sectors, &hd_qiov);
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qemu_co_mutex_lock(&s->lock);
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if (ret < 0) {
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return ret;
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goto fail;
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}
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ret = qcow2_alloc_cluster_link_l2(bs, &l2meta);
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@ -625,36 +595,19 @@ static int qcow2_aio_write_cb(QCowAIOCB *acb)
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run_dependent_requests(s, &l2meta);
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if (ret < 0) {
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return ret;
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goto fail;
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}
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acb->remaining_sectors -= cur_nr_sectors;
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acb->sector_num += cur_nr_sectors;
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acb->bytes_done += cur_nr_sectors * 512;
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remaining_sectors -= cur_nr_sectors;
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sector_num += cur_nr_sectors;
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bytes_done += cur_nr_sectors * 512;
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}
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ret = 0;
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return 0;
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}
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static int qcow2_co_writev(BlockDriverState *bs,
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int64_t sector_num,
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int nb_sectors,
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QEMUIOVector *qiov)
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{
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BDRVQcowState *s = bs->opaque;
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QCowAIOCB acb;
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int ret;
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qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, NULL, NULL, &acb);
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s->cluster_cache_offset = -1; /* disable compressed cache */
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qemu_co_mutex_lock(&s->lock);
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do {
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ret = qcow2_aio_write_cb(&acb);
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} while (ret > 0);
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fail:
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qemu_co_mutex_unlock(&s->lock);
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qemu_iovec_destroy(&acb.hd_qiov);
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qemu_iovec_destroy(&hd_qiov);
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return ret;
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}
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