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author | Kent Overstreet <kmo@daterainc.com> | 2013-08-07 23:30:24 +0200 |
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committer | Kent Overstreet <kmo@daterainc.com> | 2013-11-24 07:33:52 +0100 |
commit | f38a5181d9f3e004b1f50f9d7e1f2a8492ce240a (patch) | |
tree | f9e4457ba8def6a8a066cd0b545bfa2b9fb60a47 /net/ceph/messenger.c | |
parent | aoe: Convert to immutable biovecs (diff) | |
download | linux-f38a5181d9f3e004b1f50f9d7e1f2a8492ce240a.tar.xz linux-f38a5181d9f3e004b1f50f9d7e1f2a8492ce240a.zip |
ceph: Convert to immutable biovecs
Now that we've got a mechanism for immutable biovecs -
bi_iter.bi_bvec_done - we need to convert drivers to use primitives that
respect it instead of using the bvec array directly.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Sage Weil <sage@inktank.com>
Cc: ceph-devel@vger.kernel.org
Diffstat (limited to 'net/ceph/messenger.c')
-rw-r--r-- | net/ceph/messenger.c | 43 |
1 files changed, 17 insertions, 26 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 4a5df7b1cc9f..18c039b95c22 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -777,13 +777,12 @@ static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor, bio = data->bio; BUG_ON(!bio); - BUG_ON(!bio->bi_vcnt); cursor->resid = min(length, data->bio_length); cursor->bio = bio; - cursor->vector_index = 0; - cursor->vector_offset = 0; - cursor->last_piece = length <= bio->bi_io_vec[0].bv_len; + cursor->bvec_iter = bio->bi_iter; + cursor->last_piece = + cursor->resid <= bio_iter_len(bio, cursor->bvec_iter); } static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor, @@ -792,71 +791,63 @@ static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor, { struct ceph_msg_data *data = cursor->data; struct bio *bio; - struct bio_vec *bio_vec; - unsigned int index; + struct bio_vec bio_vec; BUG_ON(data->type != CEPH_MSG_DATA_BIO); bio = cursor->bio; BUG_ON(!bio); - index = cursor->vector_index; - BUG_ON(index >= (unsigned int) bio->bi_vcnt); + bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); - bio_vec = &bio->bi_io_vec[index]; - BUG_ON(cursor->vector_offset >= bio_vec->bv_len); - *page_offset = (size_t) (bio_vec->bv_offset + cursor->vector_offset); + *page_offset = (size_t) bio_vec.bv_offset; BUG_ON(*page_offset >= PAGE_SIZE); if (cursor->last_piece) /* pagelist offset is always 0 */ *length = cursor->resid; else - *length = (size_t) (bio_vec->bv_len - cursor->vector_offset); + *length = (size_t) bio_vec.bv_len; BUG_ON(*length > cursor->resid); BUG_ON(*page_offset + *length > PAGE_SIZE); - return bio_vec->bv_page; + return bio_vec.bv_page; } static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor, size_t bytes) { struct bio *bio; - struct bio_vec *bio_vec; - unsigned int index; + struct bio_vec bio_vec; BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO); bio = cursor->bio; BUG_ON(!bio); - index = cursor->vector_index; - BUG_ON(index >= (unsigned int) bio->bi_vcnt); - bio_vec = &bio->bi_io_vec[index]; + bio_vec = bio_iter_iovec(bio, cursor->bvec_iter); /* Advance the cursor offset */ BUG_ON(cursor->resid < bytes); cursor->resid -= bytes; - cursor->vector_offset += bytes; - if (cursor->vector_offset < bio_vec->bv_len) + + bio_advance_iter(bio, &cursor->bvec_iter, bytes); + + if (bytes < bio_vec.bv_len) return false; /* more bytes to process in this segment */ - BUG_ON(cursor->vector_offset != bio_vec->bv_len); /* Move on to the next segment, and possibly the next bio */ - if (++index == (unsigned int) bio->bi_vcnt) { + if (!cursor->bvec_iter.bi_size) { bio = bio->bi_next; - index = 0; + cursor->bvec_iter = bio->bi_iter; } cursor->bio = bio; - cursor->vector_index = index; - cursor->vector_offset = 0; if (!cursor->last_piece) { BUG_ON(!cursor->resid); BUG_ON(!bio); /* A short read is OK, so use <= rather than == */ - if (cursor->resid <= bio->bi_io_vec[index].bv_len) + if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter)) cursor->last_piece = true; } |