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| author | Kent Overstreet <koverstreet@google.com> | 2014-06-01 17:21:13 -0700 |
|---|---|---|
| committer | Andreas Blaesius <skate4life@gmx.de> | 2016-06-05 21:21:26 +0200 |
| commit | f88695ea6bfcd91c7734b083505a640bd2b551ba (patch) | |
| tree | 872be49a6469da6ecdc0291babd1687b33249810 /include | |
| parent | bb25711744c7c3086389c780a5ebfd147f9f6cce (diff) | |
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block: Add bio_for_each_segment_all()
__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.
[patch reduced to just include/linux/bio change]
Change-Id: Ia2f23d32db6149223beda41bfe7956bb73e1c1dc
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bio.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index ce33e68..da350c4 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -143,6 +143,15 @@ static inline int bio_has_allocated_vec(struct bio *bio) 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) |