bio_truncate

Name:_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

Proto:void bio_truncate(struct bio *bio, unsigned new_size)

Type:void

Parameter:

Type	Parameter	Name
struct bio *	bio
unsigned	new_size

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done = 0

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bool truncated = false

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If new_size >= residual I/O count Then Return

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If bio_op(bio) != REQ_OP_READ Then Go to exit

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bio_for_each_segment(bv, bio, iter)

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If done + bv_len > new_size Then

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If Not truncated Then offset = new_size - done

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Else offset = 0

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zero_user(bv_page, offset, bv_len - offset)

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truncated = true

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exit :

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residual I/O count = new_size

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