block: move bio_alloc_pages() to bcache

bcache is the only user of bio_alloc_pages(), so move this function into
bcache, and avoid it being misused in the future.

Also rename it to bch_bio_allo_pages() since it is bcache only.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

9 files changed, 33 insertions, 34 deletions

diff --git a/block/bio.c b/block/bio.c
index 8bfdea58159b..fe1efbeaf4aa 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -969,34 +969,6 @@ void bio_advance(struct bio *bio, unsigned bytes)
 EXPORT_SYMBOL(bio_advance);
 
 /**
- * bio_alloc_pages - allocates a single page for each bvec in a bio
- * @bio: bio to allocate pages for
- * @gfp_mask: flags for allocation
- *
- * Allocates pages up to @bio->bi_vcnt.
- *
- * Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are
- * freed.
- */
-int bio_alloc_pages(struct bio *bio, gfp_t gfp_mask)
-{
-        int i;
-        struct bio_vec *bv;
-
-        bio_for_each_segment_all(bv, bio, i) {
-                bv->bv_page = alloc_page(gfp_mask);
-                if (!bv->bv_page) {
-                        while (--bv >= bio->bi_io_vec)
-                                __free_page(bv->bv_page);
-                        return -ENOMEM;
-                }
-        }
-
-        return 0;
-}
-EXPORT_SYMBOL(bio_alloc_pages);
-
-/**
  * bio_copy_data - copy contents of data buffers from one chain of bios to
  * another
  * @src: source bio list
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 02a4cf646fdc..ebb1874218e7 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -419,7 +419,7 @@ static void do_btree_node_write(struct btree *b)
         SET_PTR_OFFSET(&k.key, 0, PTR_OFFSET(&k.key, 0) +
                        bset_sector_offset(&b->keys, i));
 
-        if (!bio_alloc_pages(b->bio, __GFP_NOWARN|GFP_NOWAIT)) {
+        if (!bch_bio_alloc_pages(b->bio, __GFP_NOWARN|GFP_NOWAIT)) {
                 int j;
                 struct bio_vec *bv;
                 void *base = (void *) ((unsigned long) i & ~(PAGE_SIZE - 1));
diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c
index c7a02c4900da..879ab21074c6 100644
--- a/drivers/md/bcache/debug.c
+++ b/drivers/md/bcache/debug.c
@@ -116,7 +116,7 @@ void bch_data_verify(struct cached_dev *dc, struct bio *bio)
                 return;
         check->bi_opf = REQ_OP_READ;
 
-        if (bio_alloc_pages(check, GFP_NOIO))
+        if (bch_bio_alloc_pages(check, GFP_NOIO))
                 goto out_put;
 
         submit_bio_wait(check);
diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c
index d50c1c97da68..a24c3a95b2c0 100644
--- a/drivers/md/bcache/movinggc.c
+++ b/drivers/md/bcache/movinggc.c
@@ -162,7 +162,7 @@ static void read_moving(struct cache_set *c)
                 bio_set_op_attrs(bio, REQ_OP_READ, 0);
                 bio->bi_end_io  = read_moving_endio;
 
-                if (bio_alloc_pages(bio, GFP_KERNEL))
+                if (bch_bio_alloc_pages(bio, GFP_KERNEL))
                         goto err;
 
                 trace_bcache_gc_copy(&w->key);
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 643c3021624f..c493fb947dc9 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -841,7 +841,7 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
         cache_bio->bi_private   = &s->cl;
 
         bch_bio_map(cache_bio, NULL);
-        if (bio_alloc_pages(cache_bio, __GFP_NOWARN|GFP_NOIO))
+        if (bch_bio_alloc_pages(cache_bio, __GFP_NOWARN|GFP_NOIO))
                 goto out_put;
 
         if (reada)
diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c
index 61813d230015..a23cd6a14b74 100644
--- a/drivers/md/bcache/util.c
+++ b/drivers/md/bcache/util.c
@@ -283,6 +283,33 @@ start:		bv->bv_len	= min_t(size_t, PAGE_SIZE - bv->bv_offset,
         }
 }
 
+/**
+ * bch_bio_alloc_pages - allocates a single page for each bvec in a bio
+ * @bio: bio to allocate pages for
+ * @gfp_mask: flags for allocation
+ *
+ * Allocates pages up to @bio->bi_vcnt.
+ *
+ * Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are
+ * freed.
+ */
+int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask)
+{
+        int i;
+        struct bio_vec *bv;
+
+        bio_for_each_segment_all(bv, bio, i) {
+                bv->bv_page = alloc_page(gfp_mask);
+                if (!bv->bv_page) {
+                        while (--bv >= bio->bi_io_vec)
+                                __free_page(bv->bv_page);
+                        return -ENOMEM;
+                }
+        }
+
+        return 0;
+}
+
 /*
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any
  * use permitted, subject to terms of PostgreSQL license; see.)
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index ed5e8a412eb8..4df4c5c1cab2 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -558,6 +558,7 @@ static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
 }
 
 void bch_bio_map(struct bio *bio, void *base);
+int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask);
 
 static inline sector_t bdev_sectors(struct block_device *bdev)
 {
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 56a37884ca8b..1ac2af6128b1 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -278,7 +278,7 @@ static void read_dirty(struct cached_dev *dc)
                 bio_set_dev(&io->bio, PTR_CACHE(dc->disk.c, &w->key, 0)->bdev);
                 io->bio.bi_end_io       = read_dirty_endio;
 
-                if (bio_alloc_pages(&io->bio, GFP_KERNEL))
+                if (bch_bio_alloc_pages(&io->bio, GFP_KERNEL))
                         goto err_free;
 
                 trace_bcache_writeback(&w->key);
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 435ddf04e889..367a979fd4a6 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -500,7 +500,6 @@ static inline void bio_flush_dcache_pages(struct bio *bi)
 #endif
 
 extern void bio_copy_data(struct bio *dst, struct bio *src);
-extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
 extern void bio_free_pages(struct bio *bio);
 
 extern struct bio *bio_copy_user_iov(struct request_queue *,