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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 09-11-2012, 12:22 AM
Kent Overstreet
 
Default block: Add bio_for_each_segment_all()

This is part of the immutable bvec prep work; bio_for_each_segment() is
going to have a different implementation so these need to be split
apart.

This change is also to better 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>
---
drivers/md/raid1.c | 2 +-
fs/bio.c | 12 ++++++------
fs/exofs/ore.c | 2 +-
fs/exofs/ore_raid.c | 2 +-
include/linux/bio.h | 16 +++++++++-------
mm/bounce.c | 2 +-
6 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 6cd1fb2..ade95ac 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1283,7 +1283,7 @@ read_again:
* know the original bi_idx, so we just free
* them all
*/
- __bio_for_each_segment(bvec, mbio, j, 0)
+ bio_for_each_segment_all(bvec, mbio, j)
bvec->bv_page = r1_bio->behind_bvecs[j].bv_page;
if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags))
atomic_inc(&r1_bio->behind_remaining);
diff --git a/fs/bio.c b/fs/bio.c
index 7fb9f4e..efdc437 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -959,7 +959,7 @@ static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs,
int iov_idx = 0;
unsigned int iov_off = 0;

- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *bv_addr = page_address(bvec->bv_page);
unsigned int bv_len = iovecs[i].bv_len;

@@ -1141,7 +1141,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
return bio;
cleanup:
if (!map_data)
- bio_for_each_segment(bvec, bio, i)
+ bio_for_each_segment_all(bvec, bio, i)
__free_page(bvec->bv_page);

bio_put(bio);
@@ -1355,7 +1355,7 @@ static void __bio_unmap_user(struct bio *bio)
/*
* make sure we dirty pages we wrote to
*/
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
if (bio_data_dir(bio) == READ)
set_page_dirty_lock(bvec->bv_page);

@@ -1461,7 +1461,7 @@ static void bio_copy_kern_endio(struct bio *bio, int err)
int i;
char *p = bmd->sgvecs[0].iov_base;

- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *addr = page_address(bvec->bv_page);
int len = bmd->iovecs[i].bv_len;

@@ -1501,7 +1501,7 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
if (!reading) {
void *p = data;

- bio_for_each_segment(bvec, bio, i) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *addr = page_address(bvec->bv_page);

memcpy(addr, p, bvec->bv_len);
@@ -1780,7 +1780,7 @@ sector_t bio_sector_offset(struct bio *bio, unsigned short index,
if (index >= bio->bi_idx)
index = bio->bi_vcnt - 1;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
if (i == index) {
if (offset > bv->bv_offset)
sectors += (offset - bv->bv_offset) / sector_sz;
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index f936cb5..b744228 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -401,7 +401,7 @@ static void _clear_bio(struct bio *bio)
struct bio_vec *bv;
unsigned i;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
unsigned this_count = bv->bv_len;

if (likely(PAGE_SIZE == this_count))
diff --git a/fs/exofs/ore_raid.c b/fs/exofs/ore_raid.c
index 5f376d1..4dec928 100644
--- a/fs/exofs/ore_raid.c
+++ b/fs/exofs/ore_raid.c
@@ -432,7 +432,7 @@ static void _mark_read4write_pages_uptodate(struct ore_io_state *ios, int ret)
if (!bio)
continue;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;

SetPageUptodate(page);
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 92015ce..b433ff8 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -137,16 +137,18 @@ 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 _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(bvl, bio, i, start_idx)
- for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx);
- i < (bio)->bi_vcnt;
- bvl++, i++)
+#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
diff --git a/mm/bounce.c b/mm/bounce.c
index 3068300..89324e2 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -134,7 +134,7 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
/*
* free up bounce indirect pages used
*/
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
org_vec = bio_orig->bi_io_vec + i;
if (bvec->bv_page == org_vec->bv_page)
continue;
--
1.7.12

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Old 09-24-2012, 10:35 PM
Kent Overstreet
 
Default 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.

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>
---
drivers/md/raid1.c | 2 +-
fs/bio.c | 12 ++++++------
fs/exofs/ore.c | 2 +-
fs/exofs/ore_raid.c | 2 +-
include/linux/bio.h | 16 +++++++++-------
mm/bounce.c | 2 +-
6 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 1c40d90..6a96e1f 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1283,7 +1283,7 @@ read_again:
* know the original bi_idx, so we just free
* them all
*/
- __bio_for_each_segment(bvec, mbio, j, 0)
+ bio_for_each_segment_all(bvec, mbio, j)
bvec->bv_page = r1_bio->behind_bvecs[j].bv_page;
if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags))
atomic_inc(&r1_bio->behind_remaining);
diff --git a/fs/bio.c b/fs/bio.c
index d433825..a641efd 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -959,7 +959,7 @@ static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs,
int iov_idx = 0;
unsigned int iov_off = 0;

- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *bv_addr = page_address(bvec->bv_page);
unsigned int bv_len = iovecs[i].bv_len;

@@ -1141,7 +1141,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
return bio;
cleanup:
if (!map_data)
- bio_for_each_segment(bvec, bio, i)
+ bio_for_each_segment_all(bvec, bio, i)
__free_page(bvec->bv_page);

bio_put(bio);
@@ -1355,7 +1355,7 @@ static void __bio_unmap_user(struct bio *bio)
/*
* make sure we dirty pages we wrote to
*/
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
if (bio_data_dir(bio) == READ)
set_page_dirty_lock(bvec->bv_page);

@@ -1461,7 +1461,7 @@ static void bio_copy_kern_endio(struct bio *bio, int err)
int i;
char *p = bmd->sgvecs[0].iov_base;

- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *addr = page_address(bvec->bv_page);
int len = bmd->iovecs[i].bv_len;

@@ -1501,7 +1501,7 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
if (!reading) {
void *p = data;

- bio_for_each_segment(bvec, bio, i) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *addr = page_address(bvec->bv_page);

memcpy(addr, p, bvec->bv_len);
@@ -1783,7 +1783,7 @@ sector_t bio_sector_offset(struct bio *bio, unsigned short index,
if (index >= bio->bi_idx)
index = bio->bi_vcnt - 1;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
if (i == index) {
if (offset > bv->bv_offset)
sectors += (offset - bv->bv_offset) / sector_sz;
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index f936cb5..b744228 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -401,7 +401,7 @@ static void _clear_bio(struct bio *bio)
struct bio_vec *bv;
unsigned i;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
unsigned this_count = bv->bv_len;

if (likely(PAGE_SIZE == this_count))
diff --git a/fs/exofs/ore_raid.c b/fs/exofs/ore_raid.c
index 5f376d1..4dec928 100644
--- a/fs/exofs/ore_raid.c
+++ b/fs/exofs/ore_raid.c
@@ -432,7 +432,7 @@ static void _mark_read4write_pages_uptodate(struct ore_io_state *ios, int ret)
if (!bio)
continue;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;

SetPageUptodate(page);
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 467e101..32966c9 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -137,16 +137,18 @@ 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 _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(bvl, bio, i, start_idx)
- for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx);
- i < (bio)->bi_vcnt;
- bvl++, i++)
+#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
diff --git a/mm/bounce.c b/mm/bounce.c
index 3068300..89324e2 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -134,7 +134,7 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
/*
* free up bounce indirect pages used
*/
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
org_vec = bio_orig->bi_io_vec + i;
if (bvec->bv_page == org_vec->bv_page)
continue;
--
1.7.12

--
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Old 10-15-2012, 08:08 PM
Kent Overstreet
 
Default 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.

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>
---
drivers/md/raid1.c | 2 +-
fs/bio.c | 12 ++++++------
fs/exofs/ore.c | 2 +-
fs/exofs/ore_raid.c | 2 +-
include/linux/bio.h | 16 +++++++++-------
mm/bounce.c | 2 +-
6 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 1c40d90..6a96e1f 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1283,7 +1283,7 @@ read_again:
* know the original bi_idx, so we just free
* them all
*/
- __bio_for_each_segment(bvec, mbio, j, 0)
+ bio_for_each_segment_all(bvec, mbio, j)
bvec->bv_page = r1_bio->behind_bvecs[j].bv_page;
if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags))
atomic_inc(&r1_bio->behind_remaining);
diff --git a/fs/bio.c b/fs/bio.c
index d698f29d..b2cccfe 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -959,7 +959,7 @@ static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs,
int iov_idx = 0;
unsigned int iov_off = 0;

- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *bv_addr = page_address(bvec->bv_page);
unsigned int bv_len = iovecs[i].bv_len;

@@ -1141,7 +1141,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
return bio;
cleanup:
if (!map_data)
- bio_for_each_segment(bvec, bio, i)
+ bio_for_each_segment_all(bvec, bio, i)
__free_page(bvec->bv_page);

bio_put(bio);
@@ -1355,7 +1355,7 @@ static void __bio_unmap_user(struct bio *bio)
/*
* make sure we dirty pages we wrote to
*/
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
if (bio_data_dir(bio) == READ)
set_page_dirty_lock(bvec->bv_page);

@@ -1461,7 +1461,7 @@ static void bio_copy_kern_endio(struct bio *bio, int err)
int i;
char *p = bmd->sgvecs[0].iov_base;

- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *addr = page_address(bvec->bv_page);
int len = bmd->iovecs[i].bv_len;

@@ -1501,7 +1501,7 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
if (!reading) {
void *p = data;

- bio_for_each_segment(bvec, bio, i) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *addr = page_address(bvec->bv_page);

memcpy(addr, p, bvec->bv_len);
@@ -1785,7 +1785,7 @@ sector_t bio_sector_offset(struct bio *bio, unsigned short index,
if (index >= bio->bi_idx)
index = bio->bi_vcnt - 1;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
if (i == index) {
if (offset > bv->bv_offset)
sectors += (offset - bv->bv_offset) / sector_sz;
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index f936cb5..b744228 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -401,7 +401,7 @@ static void _clear_bio(struct bio *bio)
struct bio_vec *bv;
unsigned i;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
unsigned this_count = bv->bv_len;

if (likely(PAGE_SIZE == this_count))
diff --git a/fs/exofs/ore_raid.c b/fs/exofs/ore_raid.c
index 5f376d1..4dec928 100644
--- a/fs/exofs/ore_raid.c
+++ b/fs/exofs/ore_raid.c
@@ -432,7 +432,7 @@ static void _mark_read4write_pages_uptodate(struct ore_io_state *ios, int ret)
if (!bio)
continue;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;

SetPageUptodate(page);
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 90d36c6..be080d2 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -137,16 +137,18 @@ 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 _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(bvl, bio, i, start_idx)
- for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx);
- i < (bio)->bi_vcnt;
- bvl++, i++)
+#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
diff --git a/mm/bounce.c b/mm/bounce.c
index 3068300..89324e2 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -134,7 +134,7 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
/*
* free up bounce indirect pages used
*/
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
org_vec = bio_orig->bi_io_vec + i;
if (bvec->bv_page == org_vec->bv_page)
continue;
--
1.7.12

--
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Old 10-15-2012, 08:09 PM
Kent Overstreet
 
Default block: Add bio_for_each_segment_all()

This is part of the immutable bvec prep work; bio_for_each_segment() is
going to have a different implementation so these need to be split
apart.

This change is also to better 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>
---
drivers/md/raid1.c | 2 +-
fs/bio.c | 12 ++++++------
fs/exofs/ore.c | 2 +-
fs/exofs/ore_raid.c | 2 +-
include/linux/bio.h | 16 +++++++++-------
mm/bounce.c | 2 +-
6 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 6cd1fb2..ade95ac 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1283,7 +1283,7 @@ read_again:
* know the original bi_idx, so we just free
* them all
*/
- __bio_for_each_segment(bvec, mbio, j, 0)
+ bio_for_each_segment_all(bvec, mbio, j)
bvec->bv_page = r1_bio->behind_bvecs[j].bv_page;
if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags))
atomic_inc(&r1_bio->behind_remaining);
diff --git a/fs/bio.c b/fs/bio.c
index 7fb9f4e..efdc437 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -959,7 +959,7 @@ static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs,
int iov_idx = 0;
unsigned int iov_off = 0;

- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *bv_addr = page_address(bvec->bv_page);
unsigned int bv_len = iovecs[i].bv_len;

@@ -1141,7 +1141,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
return bio;
cleanup:
if (!map_data)
- bio_for_each_segment(bvec, bio, i)
+ bio_for_each_segment_all(bvec, bio, i)
__free_page(bvec->bv_page);

bio_put(bio);
@@ -1355,7 +1355,7 @@ static void __bio_unmap_user(struct bio *bio)
/*
* make sure we dirty pages we wrote to
*/
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
if (bio_data_dir(bio) == READ)
set_page_dirty_lock(bvec->bv_page);

@@ -1461,7 +1461,7 @@ static void bio_copy_kern_endio(struct bio *bio, int err)
int i;
char *p = bmd->sgvecs[0].iov_base;

- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *addr = page_address(bvec->bv_page);
int len = bmd->iovecs[i].bv_len;

@@ -1501,7 +1501,7 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
if (!reading) {
void *p = data;

- bio_for_each_segment(bvec, bio, i) {
+ bio_for_each_segment_all(bvec, bio, i) {
char *addr = page_address(bvec->bv_page);

memcpy(addr, p, bvec->bv_len);
@@ -1780,7 +1780,7 @@ sector_t bio_sector_offset(struct bio *bio, unsigned short index,
if (index >= bio->bi_idx)
index = bio->bi_vcnt - 1;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
if (i == index) {
if (offset > bv->bv_offset)
sectors += (offset - bv->bv_offset) / sector_sz;
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index f936cb5..b744228 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -401,7 +401,7 @@ static void _clear_bio(struct bio *bio)
struct bio_vec *bv;
unsigned i;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
unsigned this_count = bv->bv_len;

if (likely(PAGE_SIZE == this_count))
diff --git a/fs/exofs/ore_raid.c b/fs/exofs/ore_raid.c
index 5f376d1..4dec928 100644
--- a/fs/exofs/ore_raid.c
+++ b/fs/exofs/ore_raid.c
@@ -432,7 +432,7 @@ static void _mark_read4write_pages_uptodate(struct ore_io_state *ios, int ret)
if (!bio)
continue;

- __bio_for_each_segment(bv, bio, i, 0) {
+ bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;

SetPageUptodate(page);
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 92015ce..b433ff8 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -137,16 +137,18 @@ 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 _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(bvl, bio, i, start_idx)
- for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx);
- i < (bio)->bi_vcnt;
- bvl++, i++)
+#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
diff --git a/mm/bounce.c b/mm/bounce.c
index 3068300..89324e2 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -134,7 +134,7 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
/*
* free up bounce indirect pages used
*/
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment_all(bvec, bio, i) {
org_vec = bio_orig->bi_io_vec + i;
if (bvec->bv_page == org_vec->bv_page)
continue;
--
1.7.12

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