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block: Add bio_for_each_segment_all()

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__bio_for_each_segment() iterates bvecs from the specified index
instead of bio->bv_idx.  Currently, the only usage is to walk all the
bvecs after the bio has been advanced by specifying 0 index.

For immutable bvecs, we need to split these apart;
bio_for_each_segment() is going to have a different implementation.
This will also help document the intent of code that's using it -
bio_for_each_segment_all() is only legal to use for code that owns the
bio.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: Neil Brown <neilb@suse.de>
CC: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Kent Overstreet
2013-02-06 12:23:11 -08:00
parent 6bc454d150
commit d74c6d514f
7 changed files with 25 additions and 14 deletions
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include/linux/bio.h
+14 -3
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@@ -137,16 +137,27 @@ static inline int bio_has_allocated_vec(struct bio *bio)
#define bio_io_error(bio) bio_endio((bio), -EIO)
/*
* drivers should not use the __ version unless they _really_ want to
* run through the entire bio and not just pending pieces
* drivers should not use the __ version unless they _really_ know what
* they're doing
*/
#define __bio_for_each_segment(bvl, bio, i, start_idx) \
for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \
i < (bio)->bi_vcnt; \
bvl++, i++)
/*
* drivers should _never_ use the all version - the bio may have been split
* before it got to the driver and the driver won't own all of it
*/
#define bio_for_each_segment_all(bvl, bio, i) \
for (i = 0; \
bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt; \
i++)
#define bio_for_each_segment(bvl, bio, i) \
__bio_for_each_segment(bvl, bio, i, (bio)->bi_idx)
for (i = (bio)->bi_idx; \
bvl = bio_iovec_idx((bio), (i)), i < (bio)->bi_vcnt; \
i++)
/*
* get a reference to a bio, so it won't disappear. the intended use is