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block: Implement bdrv_{pread,pwrite,pwrite_zeroes}() using generated_co_wrapper 

bdrv_{pread,pwrite}() now return -EIO instead of -EINVAL when 'bytes' is
negative, making them consistent with bdrv_{preadv,pwritev}() and
bdrv_co_{pread,pwrite,preadv,pwritev}().

bdrv_pwrite_zeroes() now also calls trace_bdrv_co_pwrite_zeroes() and
clears the BDRV_REQ_MAY_UNMAP flag when appropriate, which it didn't
previously.

Signed-off-by: Alberto Faria <afaria@redhat.com>
Message-Id: <20220609152744.3891847-8-afaria@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
This commit is contained in:
Alberto Faria 2022-06-09 16:27:41 +01:00 committed by Hanna Reitz
parent c1458c66b2
commit 1d39c7098b
2 changed files with 9 additions and 47 deletions
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41
block/io.c
View File

@ -1046,14 +1046,6 @@ static int bdrv_check_request32(int64_t offset, int64_t bytes,
return 0;
}
int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
int64_t bytes, BdrvRequestFlags flags)
{
IO_CODE();
return bdrv_pwritev(child, offset, bytes, NULL,
BDRV_REQ_ZERO_WRITE | flags);
}
/*
* Completely zero out a block device with the help of bdrv_pwrite_zeroes.
* The operation is sped up by checking the block status and only writing
@ -1096,39 +1088,6 @@ int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags)
}
}
/* See bdrv_pwrite() for the return codes */
int bdrv_pread(BdrvChild *child, int64_t offset, int64_t bytes, void *buf,
BdrvRequestFlags flags)
{
QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
IO_CODE();
if (bytes < 0) {
return -EINVAL;
}
return bdrv_preadv(child, offset, bytes, &qiov, flags);
}
/* Return no. of bytes on success or < 0 on error. Important errors are:
-EIO generic I/O error (may happen for all errors)
-ENOMEDIUM No media inserted.
-EINVAL Invalid offset or number of bytes
-EACCES Trying to write a read-only device
*/
int bdrv_pwrite(BdrvChild *child, int64_t offset, int64_t bytes,
const void *buf, BdrvRequestFlags flags)
{
QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
IO_CODE();
if (bytes < 0) {
return -EINVAL;
}
return bdrv_pwritev(child, offset, bytes, &qiov, flags);
}
/*
* Writes to the file and ensures that no writes are reordered across this
* request (acts as a barrier)

15
include/block/block-io.h
View File

@ -39,13 +39,16 @@
* to catch when they are accidentally called by the wrong API.
*/
int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
int64_t bytes, BdrvRequestFlags flags);
int generated_co_wrapper bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
int64_t bytes,
BdrvRequestFlags flags);
int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags);
int bdrv_pread(BdrvChild *child, int64_t offset, int64_t bytes, void *buf,
BdrvRequestFlags flags);
int bdrv_pwrite(BdrvChild *child, int64_t offset, int64_t bytes,
const void *buf, BdrvRequestFlags flags);
int generated_co_wrapper bdrv_pread(BdrvChild *child, int64_t offset,
int64_t bytes, void *buf,
BdrvRequestFlags flags);
int generated_co_wrapper bdrv_pwrite(BdrvChild *child, int64_t offset,
int64_t bytes, const void *buf,
BdrvRequestFlags flags);
int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, int64_t bytes,
const void *buf, BdrvRequestFlags flags);
/*