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From: Qu Wenruo <>
To: "" <>,
	"" <>,
	Linux FS Devel <>
Subject: About `bio->bi_iter.bi_size` at write endio time
Date: Tue, 15 Jun 2021 15:22:59 +0800	[thread overview]
Message-ID: <> (raw)


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 


             reply	other threads:[~2021-06-15  7:23 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-15  7:22 Qu Wenruo [this message]
2021-06-15  8:37 ` About `bio->bi_iter.bi_size` at write endio time Ming Lei

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