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* About `bio->bi_iter.bi_size` at write endio time
@ 2021-06-15  7:22 Qu Wenruo
  2021-06-15  8:37 ` Ming Lei
  0 siblings, 1 reply; 2+ messages in thread
From: Qu Wenruo @ 2021-06-15  7:22 UTC (permalink / raw)
  To: linux-btrfs, linux-block, Linux FS Devel


Recently I got a strange case where for write bio, at its endio time, I 
got bio->bi_iter.bi_size == 0, but bio_for_each_segment_all() reports we 
still have some bv_len.

And obviously, when the bio get submitted, its bi_size is not 0.

This is especially common for REQ_OP_ZONE_APPEND bio, but I also get 
rare bi_size == 0 at endio time, for REQ_OP_WRITE too.

So I guess bi_size at endio time is no longer reliable due to bio 

Thus the only correct way to get how large a bio really is, is through 


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2021-06-15  7:22 About `bio->bi_iter.bi_size` at write endio time Qu Wenruo
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