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Diffstat (limited to 'block/qcow2.c')
-rw-r--r--block/qcow2.c207
1 files changed, 80 insertions, 127 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index 52a7769752..37dab656ab 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -376,83 +376,77 @@ int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
return n1;
}
-typedef struct QCowAIOCB {
- BlockDriverState *bs;
- int64_t sector_num;
- QEMUIOVector *qiov;
- int remaining_sectors;
- uint64_t bytes_done;
- uint8_t *cluster_data;
- QEMUIOVector hd_qiov;
-} QCowAIOCB;
-
-/*
- * Returns 0 when the request is completed successfully, 1 when there is still
- * a part left to do and -errno in error cases.
- */
-static int qcow2_aio_read_cb(QCowAIOCB *acb)
+static int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
+ int remaining_sectors, QEMUIOVector *qiov)
{
- BlockDriverState *bs = acb->bs;
BDRVQcowState *s = bs->opaque;
int index_in_cluster, n1;
int ret;
int cur_nr_sectors; /* number of sectors in current iteration */
uint64_t cluster_offset = 0;
+ uint64_t bytes_done = 0;
+ QEMUIOVector hd_qiov;
+ uint8_t *cluster_data = NULL;
- while (acb->remaining_sectors != 0) {
+ qemu_iovec_init(&hd_qiov, qiov->niov);
+
+ qemu_co_mutex_lock(&s->lock);
+
+ while (remaining_sectors != 0) {
/* prepare next request */
- cur_nr_sectors = acb->remaining_sectors;
+ cur_nr_sectors = remaining_sectors;
if (s->crypt_method) {
cur_nr_sectors = MIN(cur_nr_sectors,
QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors);
}
- ret = qcow2_get_cluster_offset(bs, acb->sector_num << 9,
+ ret = qcow2_get_cluster_offset(bs, sector_num << 9,
&cur_nr_sectors, &cluster_offset);
if (ret < 0) {
- return ret;
+ goto fail;
}
- index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
+ index_in_cluster = sector_num & (s->cluster_sectors - 1);
- qemu_iovec_reset(&acb->hd_qiov);
- qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done,
+ qemu_iovec_reset(&hd_qiov);
+ qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
cur_nr_sectors * 512);
if (!cluster_offset) {
if (bs->backing_hd) {
/* read from the base image */
- n1 = qcow2_backing_read1(bs->backing_hd, &acb->hd_qiov,
- acb->sector_num, cur_nr_sectors);
+ n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov,
+ sector_num, cur_nr_sectors);
if (n1 > 0) {
BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
qemu_co_mutex_unlock(&s->lock);
- ret = bdrv_co_readv(bs->backing_hd, acb->sector_num,
- n1, &acb->hd_qiov);
+ ret = bdrv_co_readv(bs->backing_hd, sector_num,
+ n1, &hd_qiov);
qemu_co_mutex_lock(&s->lock);
if (ret < 0) {
- return ret;
+ goto fail;
}
}
} else {
/* Note: in this case, no need to wait */
- qemu_iovec_memset(&acb->hd_qiov, 0, 512 * cur_nr_sectors);
+ qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors);
}
} else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
/* add AIO support for compressed blocks ? */
ret = qcow2_decompress_cluster(bs, cluster_offset);
if (ret < 0) {
- return ret;
+ goto fail;
}
- qemu_iovec_from_buffer(&acb->hd_qiov,
+ qemu_iovec_from_buffer(&hd_qiov,
s->cluster_cache + index_in_cluster * 512,
512 * cur_nr_sectors);
} else {
if ((cluster_offset & 511) != 0) {
- return -EIO;
+ ret = -EIO;
+ goto fail;
}
if (s->crypt_method) {
@@ -460,15 +454,15 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
* For encrypted images, read everything into a temporary
* contiguous buffer on which the AES functions can work.
*/
- if (!acb->cluster_data) {
- acb->cluster_data =
+ if (!cluster_data) {
+ cluster_data =
g_malloc0(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
}
assert(cur_nr_sectors <=
QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors);
- qemu_iovec_reset(&acb->hd_qiov);
- qemu_iovec_add(&acb->hd_qiov, acb->cluster_data,
+ qemu_iovec_reset(&hd_qiov);
+ qemu_iovec_add(&hd_qiov, cluster_data,
512 * cur_nr_sectors);
}
@@ -476,63 +470,32 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
qemu_co_mutex_unlock(&s->lock);
ret = bdrv_co_readv(bs->file,
(cluster_offset >> 9) + index_in_cluster,
- cur_nr_sectors, &acb->hd_qiov);
+ cur_nr_sectors, &hd_qiov);
qemu_co_mutex_lock(&s->lock);
if (ret < 0) {
- return ret;
+ goto fail;
}
if (s->crypt_method) {
- qcow2_encrypt_sectors(s, acb->sector_num, acb->cluster_data,
- acb->cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key);
- qemu_iovec_reset(&acb->hd_qiov);
- qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done,
+ qcow2_encrypt_sectors(s, sector_num, cluster_data,
+ cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key);
+ qemu_iovec_reset(&hd_qiov);
+ qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
cur_nr_sectors * 512);
- qemu_iovec_from_buffer(&acb->hd_qiov, acb->cluster_data,
+ qemu_iovec_from_buffer(&hd_qiov, cluster_data,
512 * cur_nr_sectors);
}
}
- acb->remaining_sectors -= cur_nr_sectors;
- acb->sector_num += cur_nr_sectors;
- acb->bytes_done += cur_nr_sectors * 512;
+ remaining_sectors -= cur_nr_sectors;
+ sector_num += cur_nr_sectors;
+ bytes_done += cur_nr_sectors * 512;
}
+ ret = 0;
- return 0;
-}
-
-static QCowAIOCB *qcow2_aio_setup(BlockDriverState *bs, int64_t sector_num,
- QEMUIOVector *qiov, int nb_sectors,
- BlockDriverCompletionFunc *cb,
- void *opaque, QCowAIOCB *acb)
-{
- memset(acb, 0, sizeof(*acb));
- acb->bs = bs;
- acb->sector_num = sector_num;
- acb->qiov = qiov;
-
- qemu_iovec_init(&acb->hd_qiov, qiov->niov);
-
- acb->bytes_done = 0;
- acb->remaining_sectors = nb_sectors;
- return acb;
-}
-
-static int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, QEMUIOVector *qiov)
-{
- BDRVQcowState *s = bs->opaque;
- QCowAIOCB acb;
- int ret;
-
- qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, NULL, NULL, &acb);
-
- qemu_co_mutex_lock(&s->lock);
- do {
- ret = qcow2_aio_read_cb(&acb);
- } while (ret > 0);
+fail:
qemu_co_mutex_unlock(&s->lock);
- qemu_iovec_destroy(&acb.hd_qiov);
+ qemu_iovec_destroy(&hd_qiov);
return ret;
}
@@ -552,13 +515,11 @@ static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m)
}
}
-/*
- * Returns 0 when the request is completed successfully, 1 when there is still
- * a part left to do and -errno in error cases.
- */
-static int qcow2_aio_write_cb(QCowAIOCB *acb)
+static int qcow2_co_writev(BlockDriverState *bs,
+ int64_t sector_num,
+ int remaining_sectors,
+ QEMUIOVector *qiov)
{
- BlockDriverState *bs = acb->bs;
BDRVQcowState *s = bs->opaque;
int index_in_cluster;
int n_end;
@@ -566,47 +527,56 @@ static int qcow2_aio_write_cb(QCowAIOCB *acb)
int cur_nr_sectors; /* number of sectors in current iteration */
QCowL2Meta l2meta;
uint64_t cluster_offset;
+ QEMUIOVector hd_qiov;
+ uint64_t bytes_done = 0;
+ uint8_t *cluster_data = NULL;
l2meta.nb_clusters = 0;
qemu_co_queue_init(&l2meta.dependent_requests);
- while (acb->remaining_sectors != 0) {
+ qemu_iovec_init(&hd_qiov, qiov->niov);
+
+ s->cluster_cache_offset = -1; /* disable compressed cache */
+
+ qemu_co_mutex_lock(&s->lock);
- index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
- n_end = index_in_cluster + acb->remaining_sectors;
+ while (remaining_sectors != 0) {
+
+ index_in_cluster = sector_num & (s->cluster_sectors - 1);
+ n_end = index_in_cluster + remaining_sectors;
if (s->crypt_method &&
n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) {
n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors;
}
- ret = qcow2_alloc_cluster_offset(bs, acb->sector_num << 9,
+ ret = qcow2_alloc_cluster_offset(bs, sector_num << 9,
index_in_cluster, n_end, &cur_nr_sectors, &l2meta);
if (ret < 0) {
- return ret;
+ goto fail;
}
cluster_offset = l2meta.cluster_offset;
assert((cluster_offset & 511) == 0);
- qemu_iovec_reset(&acb->hd_qiov);
- qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done,
+ qemu_iovec_reset(&hd_qiov);
+ qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
cur_nr_sectors * 512);
if (s->crypt_method) {
- if (!acb->cluster_data) {
- acb->cluster_data = g_malloc0(QCOW_MAX_CRYPT_CLUSTERS *
+ if (!cluster_data) {
+ cluster_data = g_malloc0(QCOW_MAX_CRYPT_CLUSTERS *
s->cluster_size);
}
- assert(acb->hd_qiov.size <=
+ assert(hd_qiov.size <=
QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
- qemu_iovec_to_buffer(&acb->hd_qiov, acb->cluster_data);
+ qemu_iovec_to_buffer(&hd_qiov, cluster_data);
- qcow2_encrypt_sectors(s, acb->sector_num, acb->cluster_data,
- acb->cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key);
+ qcow2_encrypt_sectors(s, sector_num, cluster_data,
+ cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key);
- qemu_iovec_reset(&acb->hd_qiov);
- qemu_iovec_add(&acb->hd_qiov, acb->cluster_data,
+ qemu_iovec_reset(&hd_qiov);
+ qemu_iovec_add(&hd_qiov, cluster_data,
cur_nr_sectors * 512);
}
@@ -614,10 +584,10 @@ static int qcow2_aio_write_cb(QCowAIOCB *acb)
qemu_co_mutex_unlock(&s->lock);
ret = bdrv_co_writev(bs->file,
(cluster_offset >> 9) + index_in_cluster,
- cur_nr_sectors, &acb->hd_qiov);
+ cur_nr_sectors, &hd_qiov);
qemu_co_mutex_lock(&s->lock);
if (ret < 0) {
- return ret;
+ goto fail;
}
ret = qcow2_alloc_cluster_link_l2(bs, &l2meta);
@@ -625,36 +595,19 @@ static int qcow2_aio_write_cb(QCowAIOCB *acb)
run_dependent_requests(s, &l2meta);
if (ret < 0) {
- return ret;
+ goto fail;
}
- acb->remaining_sectors -= cur_nr_sectors;
- acb->sector_num += cur_nr_sectors;
- acb->bytes_done += cur_nr_sectors * 512;
+ remaining_sectors -= cur_nr_sectors;
+ sector_num += cur_nr_sectors;
+ bytes_done += cur_nr_sectors * 512;
}
+ ret = 0;
- return 0;
-}
-
-static int qcow2_co_writev(BlockDriverState *bs,
- int64_t sector_num,
- int nb_sectors,
- QEMUIOVector *qiov)
-{
- BDRVQcowState *s = bs->opaque;
- QCowAIOCB acb;
- int ret;
-
- qcow2_aio_setup(bs, sector_num, qiov, nb_sectors, NULL, NULL, &acb);
- s->cluster_cache_offset = -1; /* disable compressed cache */
-
- qemu_co_mutex_lock(&s->lock);
- do {
- ret = qcow2_aio_write_cb(&acb);
- } while (ret > 0);
+fail:
qemu_co_mutex_unlock(&s->lock);
- qemu_iovec_destroy(&acb.hd_qiov);
+ qemu_iovec_destroy(&hd_qiov);
return ret;
}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-20 07:25:07 +0000