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block: Pass BdrvChild to bdrv_aligned_preadv/pwritev and copy-on-read

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This is where we want to check the permissions, so we need to have the
BdrvChild around where they are stored.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-02-09 15:58:43 +01:00
parent 2807c0cd43
commit 85c97ca7a1
1 changed files with 21 additions and 16 deletions
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37
block/io.c
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@ -925,9 +925,11 @@ bdrv_driver_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
return drv->bdrv_co_pwritev_compressed(bs, offset, bytes, qiov);
}
static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs,
static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov)
{
BlockDriverState *bs = child->bs;
/* Perform I/O through a temporary buffer so that users who scribble over
* their read buffer while the operation is in progress do not end up
* modifying the image file. This is critical for zero-copy guest I/O
@ -1001,10 +1003,11 @@ err:
* handles copy on read, zeroing after EOF, and fragmentation of large
* reads; any other features must be implemented by the caller.
*/
static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child,
BdrvTrackedRequest *req, int64_t offset, unsigned int bytes,
int64_t align, QEMUIOVector *qiov, int flags)
{
BlockDriverState *bs = child->bs;
int64_t total_bytes, max_bytes;
int ret = 0;
uint64_t bytes_remaining = bytes;
@ -1050,7 +1053,7 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
}
if (!ret || pnum != nb_sectors) {
ret = bdrv_co_do_copy_on_readv(bs, offset, bytes, qiov);
ret = bdrv_co_do_copy_on_readv(child, offset, bytes, qiov);
goto out;
}
}
@ -1158,7 +1161,7 @@ int coroutine_fn bdrv_co_preadv(BdrvChild *child,
}
tracked_request_begin(&req, bs, offset, bytes, BDRV_TRACKED_READ);
ret = bdrv_aligned_preadv(bs, &req, offset, bytes, align,
ret = bdrv_aligned_preadv(child, &req, offset, bytes, align,
use_local_qiov ? &local_qiov : qiov,
flags);
tracked_request_end(&req);
@ -1306,10 +1309,11 @@ fail:
* Forwards an already correctly aligned write request to the BlockDriver,
* after possibly fragmenting it.
*/
static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child,
BdrvTrackedRequest *req, int64_t offset, unsigned int bytes,
int64_t align, QEMUIOVector *qiov, int flags)
{
BlockDriverState *bs = child->bs;
BlockDriver *drv = bs->drv;
bool waited;
int ret;
@ -1397,12 +1401,13 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
return ret;
}
static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
static int coroutine_fn bdrv_co_do_zero_pwritev(BdrvChild *child,
int64_t offset,
unsigned int bytes,
BdrvRequestFlags flags,
BdrvTrackedRequest *req)
{
BlockDriverState *bs = child->bs;
uint8_t *buf = NULL;
QEMUIOVector local_qiov;
struct iovec iov;
@ -1430,7 +1435,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
mark_request_serialising(req, align);
wait_serialising_requests(req);
bdrv_debug_event(bs, BLKDBG_PWRITEV_RMW_HEAD);
ret = bdrv_aligned_preadv(bs, req, offset & ~(align - 1), align,
ret = bdrv_aligned_preadv(child, req, offset & ~(align - 1), align,
align, &local_qiov, 0);
if (ret < 0) {
goto fail;
@ -1438,7 +1443,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
bdrv_debug_event(bs, BLKDBG_PWRITEV_RMW_AFTER_HEAD);
memset(buf + head_padding_bytes, 0, zero_bytes);
ret = bdrv_aligned_pwritev(bs, req, offset & ~(align - 1), align,
ret = bdrv_aligned_pwritev(child, req, offset & ~(align - 1), align,
align, &local_qiov,
flags & ~BDRV_REQ_ZERO_WRITE);
if (ret < 0) {
@ -1452,7 +1457,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
if (bytes >= align) {
/* Write the aligned part in the middle. */
uint64_t aligned_bytes = bytes & ~(align - 1);
ret = bdrv_aligned_pwritev(bs, req, offset, aligned_bytes, align,
ret = bdrv_aligned_pwritev(child, req, offset, aligned_bytes, align,
NULL, flags);
if (ret < 0) {
goto fail;
@ -1468,7 +1473,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
mark_request_serialising(req, align);
wait_serialising_requests(req);
bdrv_debug_event(bs, BLKDBG_PWRITEV_RMW_TAIL);
ret = bdrv_aligned_preadv(bs, req, offset, align,
ret = bdrv_aligned_preadv(child, req, offset, align,
align, &local_qiov, 0);
if (ret < 0) {
goto fail;
@ -1476,7 +1481,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
bdrv_debug_event(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL);
memset(buf, 0, bytes);
ret = bdrv_aligned_pwritev(bs, req, offset, align, align,
ret = bdrv_aligned_pwritev(child, req, offset, align, align,
&local_qiov, flags & ~BDRV_REQ_ZERO_WRITE);
}
fail:
@ -1523,7 +1528,7 @@ int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
tracked_request_begin(&req, bs, offset, bytes, BDRV_TRACKED_WRITE);
if (!qiov) {
ret = bdrv_co_do_zero_pwritev(bs, offset, bytes, flags, &req);
ret = bdrv_co_do_zero_pwritev(child, offset, bytes, flags, &req);
goto out;
}
@ -1542,7 +1547,7 @@ int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
qemu_iovec_init_external(&head_qiov, &head_iov, 1);
bdrv_debug_event(bs, BLKDBG_PWRITEV_RMW_HEAD);
ret = bdrv_aligned_preadv(bs, &req, offset & ~(align - 1), align,
ret = bdrv_aligned_preadv(child, &req, offset & ~(align - 1), align,
align, &head_qiov, 0);
if (ret < 0) {
goto fail;
@ -1584,8 +1589,8 @@ int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
qemu_iovec_init_external(&tail_qiov, &tail_iov, 1);
bdrv_debug_event(bs, BLKDBG_PWRITEV_RMW_TAIL);
ret = bdrv_aligned_preadv(bs, &req, (offset + bytes) & ~(align - 1), align,
align, &tail_qiov, 0);
ret = bdrv_aligned_preadv(child, &req, (offset + bytes) & ~(align - 1),
align, align, &tail_qiov, 0);
if (ret < 0) {
goto fail;
}
@ -1603,7 +1608,7 @@ int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
bytes = ROUND_UP(bytes, align);
}
ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, align,
ret = bdrv_aligned_pwritev(child, &req, offset, bytes, align,
use_local_qiov ? &local_qiov : qiov,
flags);