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authorVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>2020-12-11 21:39:29 +0300
committerEric Blake <eblake@redhat.com>2021-02-03 08:16:03 -0600
commitfcfd9ade687864dc194bac11150195e5ec884676 (patch)
tree902110a0460607703dd4e71c5f9bebf5609c3e16 /blockdev-nbd.c
parent5ae07b141085c9ac0e10b739639e760b71c490f2 (diff)
block/io: support int64_t bytes in bdrv_aligned_pwritev()
We are generally moving to int64_t for both offset and bytes parameters on all io paths. Main motivation is realization of 64-bit write_zeroes operation for fast zeroing large disk chunks, up to the whole disk. We chose signed type, to be consistent with off_t (which is signed) and with possibility for signed return type (where negative value means error). So, prepare bdrv_aligned_pwritev() now and convert the dependencies: bdrv_co_write_req_prepare() and bdrv_co_write_req_finish() to signed type bytes. Conversion of bdrv_co_write_req_prepare() and bdrv_co_write_req_finish() is definitely safe, as all requests in block/io must not overflow BDRV_MAX_LENGTH. Still add assertions. For bdrv_aligned_pwritev() 'bytes' type is widened, so callers are safe. Let's check usage of the parameter inside the function. Passing to bdrv_co_write_req_prepare() and bdrv_co_write_req_finish() is OK. Passing to qemu_iovec_* is OK after new assertion. All other callees are already updated to int64_t. Checking alignment is not changed, offset + bytes and qiov_offset + bytes calculations are safe (thanks to new assertions). max_transfer is kept to be int for now. It has a default of INT_MAX here, and some drivers may rely on it. It's to be refactored later. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20201211183934.169161-12-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'blockdev-nbd.c')
0 files changed, 0 insertions, 0 deletions