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Subject[PATCH V13 04/19] block: rename bvec helpers
Date
We will support multi-page bvec soon, and have to deal with
single-page vs multi-page bvec. This patch follows Christoph's
suggestion to rename all the following helpers:

for_each_bvec
bvec_iter_bvec
bvec_iter_len
bvec_iter_page
bvec_iter_offset

into:
for_each_segment
segment_iter_bvec
segment_iter_len
segment_iter_page
segment_iter_offset

so that these helpers named with 'segment' only deal with single-page
bvec, or called segment. We will introduce helpers named with 'bvec'
for multi-page bvec.

bvec_iter_advance() isn't renamed becasue this helper is always operated
on real bvec even though multi-page bvec is supported.

Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
.clang-format | 2 +-
drivers/md/dm-integrity.c | 2 +-
drivers/md/dm-io.c | 4 ++--
drivers/nvdimm/blk.c | 4 ++--
drivers/nvdimm/btt.c | 4 ++--
include/linux/bio.h | 10 +++++-----
include/linux/bvec.h | 20 +++++++++++---------
include/linux/ceph/messenger.h | 2 +-
lib/iov_iter.c | 2 +-
net/ceph/messenger.c | 14 +++++++-------
10 files changed, 33 insertions(+), 31 deletions(-)

diff --git a/.clang-format b/.clang-format
index e6080f5834a3..049200fbab94 100644
--- a/.clang-format
+++ b/.clang-format
@@ -120,7 +120,7 @@ ForEachMacros:
- 'for_each_available_child_of_node'
- 'for_each_bio'
- 'for_each_board_func_rsrc'
- - 'for_each_bvec'
+ - 'for_each_segment'
- 'for_each_child_of_node'
- 'for_each_clear_bit'
- 'for_each_clear_bit_from'
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index 457200ca6287..046b7785e3f6 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -1574,7 +1574,7 @@ static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
char *tag_ptr = journal_entry_tag(ic, je);

if (bip) do {
- struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
+ struct bio_vec biv = segment_iter_bvec(bip->bip_vec, bip->bip_iter);
unsigned tag_now = min(biv.bv_len, tag_todo);
char *tag_addr;
BUG_ON(PageHighMem(biv.bv_page));
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index 81ffc59d05c9..d72ec2bdd333 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -208,8 +208,8 @@ static void list_dp_init(struct dpages *dp, struct page_list *pl, unsigned offse
static void bio_get_page(struct dpages *dp, struct page **p,
unsigned long *len, unsigned *offset)
{
- struct bio_vec bvec = bvec_iter_bvec((struct bio_vec *)dp->context_ptr,
- dp->context_bi);
+ struct bio_vec bvec = segment_iter_bvec((struct bio_vec *)dp->context_ptr,
+ dp->context_bi);

*p = bvec.bv_page;
*len = bvec.bv_len;
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index db45c6bbb7bb..dfae945216bb 100644
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -89,9 +89,9 @@ static int nd_blk_rw_integrity(struct nd_namespace_blk *nsblk,
struct bio_vec bv;
void *iobuf;

- bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
+ bv = segment_iter_bvec(bip->bip_vec, bip->bip_iter);
/*
- * The 'bv' obtained from bvec_iter_bvec has its .bv_len and
+ * The 'bv' obtained from segment_iter_bvec has its .bv_len and
* .bv_offset already adjusted for iter->bi_bvec_done, and we
* can use those directly
*/
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index b123b0dcf274..2bbbc90c7b91 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1154,9 +1154,9 @@ static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip,
struct bio_vec bv;
void *mem;

- bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
+ bv = segment_iter_bvec(bip->bip_vec, bip->bip_iter);
/*
- * The 'bv' obtained from bvec_iter_bvec has its .bv_len and
+ * The 'bv' obtained from segment_iter_bvec has its .bv_len and
* .bv_offset already adjusted for iter->bi_bvec_done, and we
* can use those directly
*/
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 72b4f7be2106..16a65361535f 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -48,14 +48,14 @@
#define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio)

#define bio_iter_iovec(bio, iter) \
- bvec_iter_bvec((bio)->bi_io_vec, (iter))
+ segment_iter_bvec((bio)->bi_io_vec, (iter))

#define bio_iter_page(bio, iter) \
- bvec_iter_page((bio)->bi_io_vec, (iter))
+ segment_iter_page((bio)->bi_io_vec, (iter))
#define bio_iter_len(bio, iter) \
- bvec_iter_len((bio)->bi_io_vec, (iter))
+ segment_iter_len((bio)->bi_io_vec, (iter))
#define bio_iter_offset(bio, iter) \
- bvec_iter_offset((bio)->bi_io_vec, (iter))
+ segment_iter_offset((bio)->bi_io_vec, (iter))

#define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter)
#define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter)
@@ -738,7 +738,7 @@ static inline bool bioset_initialized(struct bio_set *bs)
#if defined(CONFIG_BLK_DEV_INTEGRITY)

#define bip_for_each_vec(bvl, bip, iter) \
- for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)
+ for_each_segment(bvl, (bip)->bip_vec, iter, (bip)->bip_iter)

#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \
for_each_bio(_bio) \
diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index ba0ae40e77c9..716a87b26a6a 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -50,23 +50,25 @@ struct bvec_iter {
*/
#define __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx])

-#define bvec_iter_page(bvec, iter) \
+#define segment_iter_page(bvec, iter) \
(__bvec_iter_bvec((bvec), (iter))->bv_page)

-#define bvec_iter_len(bvec, iter) \
+#define segment_iter_len(bvec, iter) \
min((iter).bi_size, \
__bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done)

-#define bvec_iter_offset(bvec, iter) \
+#define segment_iter_offset(bvec, iter) \
(__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done)

-#define bvec_iter_bvec(bvec, iter) \
+#define segment_iter_bvec(bvec, iter) \
((struct bio_vec) { \
- .bv_page = bvec_iter_page((bvec), (iter)), \
- .bv_len = bvec_iter_len((bvec), (iter)), \
- .bv_offset = bvec_iter_offset((bvec), (iter)), \
+ .bv_page = segment_iter_page((bvec), (iter)), \
+ .bv_len = segment_iter_len((bvec), (iter)), \
+ .bv_offset = segment_iter_offset((bvec), (iter)), \
})

+#define bvec_iter_len segment_iter_len
+
static inline bool bvec_iter_advance(const struct bio_vec *bv,
struct bvec_iter *iter, unsigned bytes)
{
@@ -92,10 +94,10 @@ static inline bool bvec_iter_advance(const struct bio_vec *bv,
return true;
}

-#define for_each_bvec(bvl, bio_vec, iter, start) \
+#define for_each_segment(bvl, bio_vec, iter, start) \
for (iter = (start); \
(iter).bi_size && \
- ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
+ ((bvl = segment_iter_bvec((bio_vec), (iter))), 1); \
bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len))

/* for iterating one bio from start to end */
diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index 800a2128d411..c7e37a7229c4 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -155,7 +155,7 @@ struct ceph_bvec_iter {
\
__cur_iter = (it)->iter; \
__cur_iter.bi_size = (n); \
- for_each_bvec(bv, (it)->bvecs, __cur_iter, __cur_iter) \
+ for_each_segment(bv, (it)->bvecs, __cur_iter, __cur_iter) \
(void)(BVEC_STEP); \
}))

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index be4bd627caf0..017eba58489c 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -66,7 +66,7 @@
__start.bi_size = n; \
__start.bi_bvec_done = skip; \
__start.bi_idx = 0; \
- for_each_bvec(__v, i->bvec, __bi, __start) { \
+ for_each_segment(__v, i->bvec, __bi, __start) { \
if (!__v.bv_len) \
continue; \
(void)(STEP); \
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index d5718284db57..7cda449752b1 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -878,17 +878,17 @@ static void ceph_msg_data_bvecs_cursor_init(struct ceph_msg_data_cursor *cursor,
cursor->bvec_iter = data->bvec_pos.iter;
cursor->bvec_iter.bi_size = cursor->resid;

- BUG_ON(cursor->resid < bvec_iter_len(bvecs, cursor->bvec_iter));
+ BUG_ON(cursor->resid < segment_iter_len(bvecs, cursor->bvec_iter));
cursor->last_piece =
- cursor->resid == bvec_iter_len(bvecs, cursor->bvec_iter);
+ cursor->resid == segment_iter_len(bvecs, cursor->bvec_iter);
}

static struct page *ceph_msg_data_bvecs_next(struct ceph_msg_data_cursor *cursor,
size_t *page_offset,
size_t *length)
{
- struct bio_vec bv = bvec_iter_bvec(cursor->data->bvec_pos.bvecs,
- cursor->bvec_iter);
+ struct bio_vec bv = segment_iter_bvec(cursor->data->bvec_pos.bvecs,
+ cursor->bvec_iter);

*page_offset = bv.bv_offset;
*length = bv.bv_len;
@@ -901,7 +901,7 @@ static bool ceph_msg_data_bvecs_advance(struct ceph_msg_data_cursor *cursor,
struct bio_vec *bvecs = cursor->data->bvec_pos.bvecs;

BUG_ON(bytes > cursor->resid);
- BUG_ON(bytes > bvec_iter_len(bvecs, cursor->bvec_iter));
+ BUG_ON(bytes > segment_iter_len(bvecs, cursor->bvec_iter));
cursor->resid -= bytes;
bvec_iter_advance(bvecs, &cursor->bvec_iter, bytes);

@@ -914,9 +914,9 @@ static bool ceph_msg_data_bvecs_advance(struct ceph_msg_data_cursor *cursor,
return false; /* more bytes to process in this segment */

BUG_ON(cursor->last_piece);
- BUG_ON(cursor->resid < bvec_iter_len(bvecs, cursor->bvec_iter));
+ BUG_ON(cursor->resid < segment_iter_len(bvecs, cursor->bvec_iter));
cursor->last_piece =
- cursor->resid == bvec_iter_len(bvecs, cursor->bvec_iter);
+ cursor->resid == segment_iter_len(bvecs, cursor->bvec_iter);
return true;
}

--
2.9.5
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