diff options
Diffstat (limited to 'block/io.c')
-rw-r--r-- | block/io.c | 52 |
1 files changed, 23 insertions, 29 deletions
@@ -967,6 +967,7 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, int64_t align, QEMUIOVector *qiov, int flags) { + int64_t total_bytes, max_bytes; int ret; assert(is_power_of_2(align)); @@ -1008,40 +1009,33 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, } /* Forward the request to the BlockDriver */ - if (!bs->zero_beyond_eof) { - ret = bdrv_driver_preadv(bs, offset, bytes, qiov, 0); - } else { - /* Read zeros after EOF */ - int64_t total_bytes, max_bytes; - - total_bytes = bdrv_getlength(bs); - if (total_bytes < 0) { - ret = total_bytes; - goto out; - } + total_bytes = bdrv_getlength(bs); + if (total_bytes < 0) { + ret = total_bytes; + goto out; + } - max_bytes = ROUND_UP(MAX(0, total_bytes - offset), align); - if (bytes < max_bytes) { - ret = bdrv_driver_preadv(bs, offset, bytes, qiov, 0); - } else if (max_bytes > 0) { - QEMUIOVector local_qiov; + max_bytes = ROUND_UP(MAX(0, total_bytes - offset), align); + if (bytes < max_bytes) { + ret = bdrv_driver_preadv(bs, offset, bytes, qiov, 0); + } else if (max_bytes > 0) { + QEMUIOVector local_qiov; - qemu_iovec_init(&local_qiov, qiov->niov); - qemu_iovec_concat(&local_qiov, qiov, 0, max_bytes); + qemu_iovec_init(&local_qiov, qiov->niov); + qemu_iovec_concat(&local_qiov, qiov, 0, max_bytes); - ret = bdrv_driver_preadv(bs, offset, max_bytes, &local_qiov, 0); + ret = bdrv_driver_preadv(bs, offset, max_bytes, &local_qiov, 0); - qemu_iovec_destroy(&local_qiov); - } else { - ret = 0; - } + qemu_iovec_destroy(&local_qiov); + } else { + ret = 0; + } - /* Reading beyond end of file is supposed to produce zeroes */ - if (ret == 0 && total_bytes < offset + bytes) { - uint64_t zero_offset = MAX(0, total_bytes - offset); - uint64_t zero_bytes = offset + bytes - zero_offset; - qemu_iovec_memset(qiov, zero_offset, 0, zero_bytes); - } + /* Reading beyond end of file is supposed to produce zeroes */ + if (ret == 0 && total_bytes < offset + bytes) { + uint64_t zero_offset = MAX(0, total_bytes - offset); + uint64_t zero_bytes = offset + bytes - zero_offset; + qemu_iovec_memset(qiov, zero_offset, 0, zero_bytes); } out: |