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fs: move guard_bio_eod() after bio_set_op_attrs

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commit 83c9c547168e8b914ea6398430473a4de68c52cc upstream.

Commit 85a8ce62c2ea ("block: add bio_truncate to fix guard_bio_eod")
adds bio_truncate() for handling bio EOD. However, bio_truncate()
doesn't use the passed 'op' parameter from guard_bio_eod's callers.

So bio_trunacate() may retrieve wrong 'op', and zering pages may
not be done for READ bio.

Fixes this issue by moving guard_bio_eod() after bio_set_op_attrs()
in submit_bh_wbc() so that bio_truncate() can always retrieve correct
op info.

Meantime remove the 'op' parameter from guard_bio_eod() because it isn't
used any more.

Cc: Carlos Maiolino <[email protected]>
Cc: [email protected]
Fixes: 85a8ce62c2ea ("block: add bio_truncate to fix guard_bio_eod")
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Fold in kerneldoc and bio_op() change.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ming Lei 2020-01-05 09:41:14 +08:00 • committed by Greg Kroah-Hartman
commit 3fe209c843
4 changed files with 17 additions and 7 deletions
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12
block/bio.c
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@ -535,6 +535,16 @@ void zero_fill_bio_iter(struct bio *bio, struct bvec_iter start)
}
EXPORT_SYMBOL(zero_fill_bio_iter);
/**
* bio_truncate - truncate the bio to small size of @new_size
* @bio: the bio to be truncated
* @new_size: new size for truncating the bio
*
* Description:
* Truncate the bio to new size of @new_size. If bio_op(bio) is
* REQ_OP_READ, zero the truncated part. This function should only
* be used for handling corner cases, such as bio eod.
*/
void bio_truncate(struct bio *bio, unsigned new_size)
{
struct bio_vec bv;
@ -545,7 +555,7 @@ void bio_truncate(struct bio *bio, unsigned new_size)
if (new_size >= bio->bi_iter.bi_size)
return;
if (bio_data_dir(bio) != READ)
if (bio_op(bio) != REQ_OP_READ)
goto exit;
bio_for_each_segment(bv, bio, iter) {