aboutsummaryrefslogtreecommitdiff
path: root/block/qcow.c
diff options
context:
space:
mode:
authorEric Blake <eblake@redhat.com>2018-06-28 15:15:22 -0500
committerKevin Wolf <kwolf@redhat.com>2018-06-29 14:20:56 +0200
commit609841a3f8cb1761380032b7bbccb438abb8290f (patch)
tree153b10ac70edd825bf6776a0f8f0f47ebbad24a5 /block/qcow.c
parentd1326a786d471840b9055af53a7aa57c2e6d858c (diff)
downloadqemu-609841a3f8cb1761380032b7bbccb438abb8290f.zip
qemu-609841a3f8cb1761380032b7bbccb438abb8290f.tar.gz
qemu-609841a3f8cb1761380032b7bbccb438abb8290f.tar.bz2
qcow: Switch to a byte-based driver
We are gradually moving away from sector-based interfaces, towards byte-based. The qcow driver is now ready to fully utilize the byte-based callback interface, as long as we override the default alignment to still be 512 (needed at least for asserts present because of encryption, but easier to do everywhere than to audit which sub-sector requests are handled correctly, especially since we no longer recommend qcow for new disk images). Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow.c')
-rw-r--r--block/qcow.c35
1 files changed, 20 insertions, 15 deletions
diff --git a/block/qcow.c b/block/qcow.c
index 8fe82ed..102d058 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -70,7 +70,6 @@ typedef struct QCowHeader {
typedef struct BDRVQcowState {
int cluster_bits;
int cluster_size;
- int cluster_sectors;
int l2_bits;
int l2_size;
unsigned int l1_size;
@@ -235,7 +234,6 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
}
s->cluster_bits = header.cluster_bits;
s->cluster_size = 1 << s->cluster_bits;
- s->cluster_sectors = 1 << (s->cluster_bits - 9);
s->l2_bits = header.l2_bits;
s->l2_size = 1 << s->l2_bits;
bs->total_sectors = header.size / 512;
@@ -613,8 +611,18 @@ static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset)
return 0;
}
-static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, QEMUIOVector *qiov)
+static void qcow_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+ /* At least encrypted images require 512-byte alignment. Apply the
+ * limit universally, rather than just on encrypted images, as
+ * it's easier to let the block layer handle rounding than to
+ * audit this code further. */
+ bs->bl.request_alignment = BDRV_SECTOR_SIZE;
+}
+
+static coroutine_fn int qcow_co_preadv(BlockDriverState *bs, uint64_t offset,
+ uint64_t bytes, QEMUIOVector *qiov,
+ int flags)
{
BDRVQcowState *s = bs->opaque;
int offset_in_cluster;
@@ -624,9 +632,8 @@ static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
QEMUIOVector hd_qiov;
uint8_t *buf;
void *orig_buf;
- int64_t offset = sector_num * BDRV_SECTOR_SIZE;
- int64_t bytes = nb_sectors * BDRV_SECTOR_SIZE;
+ assert(!flags);
if (qiov->niov > 1) {
buf = orig_buf = qemu_try_blockalign(bs, qiov->size);
if (buf == NULL) {
@@ -718,9 +725,9 @@ static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
return ret;
}
-static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, QEMUIOVector *qiov,
- int flags)
+static coroutine_fn int qcow_co_pwritev(BlockDriverState *bs, uint64_t offset,
+ uint64_t bytes, QEMUIOVector *qiov,
+ int flags)
{
BDRVQcowState *s = bs->opaque;
int offset_in_cluster;
@@ -730,8 +737,6 @@ static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
QEMUIOVector hd_qiov;
uint8_t *buf;
void *orig_buf;
- int64_t offset = sector_num * BDRV_SECTOR_SIZE;
- int64_t bytes = nb_sectors * BDRV_SECTOR_SIZE;
assert(!flags);
s->cluster_cache_offset = -1; /* disable compressed cache */
@@ -1104,8 +1109,7 @@ qcow_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
/* could not compress: write normal cluster */
- ret = qcow_co_writev(bs, offset >> BDRV_SECTOR_BITS,
- bytes >> BDRV_SECTOR_BITS, qiov, 0);
+ ret = qcow_co_pwritev(bs, offset, bytes, qiov, 0);
if (ret < 0) {
goto fail;
}
@@ -1190,9 +1194,10 @@ static BlockDriver bdrv_qcow = {
.bdrv_co_create_opts = qcow_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.supports_backing = true,
+ .bdrv_refresh_limits = qcow_refresh_limits,
- .bdrv_co_readv = qcow_co_readv,
- .bdrv_co_writev = qcow_co_writev,
+ .bdrv_co_preadv = qcow_co_preadv,
+ .bdrv_co_pwritev = qcow_co_pwritev,
.bdrv_co_block_status = qcow_co_block_status,
.bdrv_make_empty = qcow_make_empty,