On 11/30/12 10:09, Christoph Hellwig wrote:
use_alloc_page:
- start = BBTOB(bp->b_map.bm_bn)>> PAGE_SHIFT;
- end = (BBTOB(bp->b_map.bm_bn + bp->b_length) + PAGE_SIZE - 1)
+ start = BBTOB(bp->b_maps[0].bm_bn)>> PAGE_SHIFT;
+ end = (BBTOB(bp->b_maps[0].bm_bn + bp->b_length) + PAGE_SIZE - 1)
Btw, how is this logic supposed to work for discontiguous buffers?
Each of them might straddle boundaries individually, so doing the
start/end calculation for the number of pages isn't going to be correct.
eeek. yep, I will loop through and count the pages needed in each
segment.
--Mark.
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