#include <linux/module.h>
#include <linux/mempool.h>
#include <linux/workqueue.h>
+#include <scsi/sg.h> /* for struct sg_iovec */
#define BIO_POOL_SIZE 256
-static mempool_t *bio_pool;
static kmem_cache_t *bio_slab;
#define BIOVEC_NR_POOLS 6
#define BIO_SPLIT_ENTRIES 8
mempool_t *bio_split_pool;
-struct biovec_pool {
+struct biovec_slab {
int nr_vecs;
char *name;
kmem_cache_t *slab;
- mempool_t *pool;
};
/*
*/
#define BV(x) { .nr_vecs = x, .name = "biovec-"__stringify(x) }
-static struct biovec_pool bvec_array[BIOVEC_NR_POOLS] = {
+static struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly = {
BV(1), BV(4), BV(16), BV(64), BV(128), BV(BIO_MAX_PAGES),
};
#undef BV
-static inline struct bio_vec *bvec_alloc(int gfp_mask, int nr, unsigned long *idx)
+/*
+ * bio_set is used to allow other portions of the IO system to
+ * allocate their own private memory pools for bio and iovec structures.
+ * These memory pools in turn all allocate from the bio_slab
+ * and the bvec_slabs[].
+ */
+struct bio_set {
+ mempool_t *bio_pool;
+ mempool_t *bvec_pools[BIOVEC_NR_POOLS];
+};
+
+/*
+ * fs_bio_set is the bio_set containing bio and iovec memory pools used by
+ * IO code that does not need private memory pools.
+ */
+static struct bio_set *fs_bio_set;
+
+static inline struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs)
{
- struct biovec_pool *bp;
struct bio_vec *bvl;
+ struct biovec_slab *bp;
/*
* see comment near bvec_array define!
/*
* idx now points to the pool we want to allocate from
*/
- bp = bvec_array + *idx;
- bvl = mempool_alloc(bp->pool, gfp_mask);
+ bp = bvec_slabs + *idx;
+ bvl = mempool_alloc(bs->bvec_pools[*idx], gfp_mask);
if (bvl)
memset(bvl, 0, bp->nr_vecs * sizeof(struct bio_vec));
+
return bvl;
}
-/*
- * default destructor for a bio allocated with bio_alloc()
- */
-void bio_destructor(struct bio *bio)
+void bio_free(struct bio *bio, struct bio_set *bio_set)
{
const int pool_idx = BIO_POOL_IDX(bio);
- struct biovec_pool *bp = bvec_array + pool_idx;
BIO_BUG_ON(pool_idx >= BIOVEC_NR_POOLS);
- mempool_free(bio->bi_io_vec, bp->pool);
- mempool_free(bio, bio_pool);
+ mempool_free(bio->bi_io_vec, bio_set->bvec_pools[pool_idx]);
+ mempool_free(bio, bio_set->bio_pool);
+}
+
+/*
+ * default destructor for a bio allocated with bio_alloc_bioset()
+ */
+static void bio_fs_destructor(struct bio *bio)
+{
+ bio_free(bio, fs_bio_set);
}
-inline void bio_init(struct bio *bio)
+void bio_init(struct bio *bio)
{
bio->bi_next = NULL;
+ bio->bi_bdev = NULL;
bio->bi_flags = 1 << BIO_UPTODATE;
bio->bi_rw = 0;
bio->bi_vcnt = 0;
}
/**
- * bio_alloc - allocate a bio for I/O
+ * bio_alloc_bioset - allocate a bio for I/O
* @gfp_mask: the GFP_ mask given to the slab allocator
* @nr_iovecs: number of iovecs to pre-allocate
+ * @bs: the bio_set to allocate from
*
* Description:
- * bio_alloc will first try it's on mempool to satisfy the allocation.
+ * bio_alloc_bioset will first try it's on mempool to satisfy the allocation.
* If %__GFP_WAIT is set then we will block on the internal pool waiting
* for a &struct bio to become free.
+ *
+ * allocate bio and iovecs from the memory pools specified by the
+ * bio_set structure.
**/
-struct bio *bio_alloc(int gfp_mask, int nr_iovecs)
+struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
{
- struct bio *bio = mempool_alloc(bio_pool, gfp_mask);
+ struct bio *bio = mempool_alloc(bs->bio_pool, gfp_mask);
if (likely(bio)) {
struct bio_vec *bvl = NULL;
if (likely(nr_iovecs)) {
unsigned long idx;
- bvl = bvec_alloc(gfp_mask, nr_iovecs, &idx);
+ bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs);
if (unlikely(!bvl)) {
- mempool_free(bio, bio_pool);
+ mempool_free(bio, bs->bio_pool);
bio = NULL;
goto out;
}
bio->bi_flags |= idx << BIO_POOL_OFFSET;
- bio->bi_max_vecs = bvec_array[idx].nr_vecs;
+ bio->bi_max_vecs = bvec_slabs[idx].nr_vecs;
}
bio->bi_io_vec = bvl;
- bio->bi_destructor = bio_destructor;
}
out:
return bio;
}
+struct bio *bio_alloc(gfp_t gfp_mask, int nr_iovecs)
+{
+ struct bio *bio = bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
+
+ if (bio)
+ bio->bi_destructor = bio_fs_destructor;
+
+ return bio;
+}
+
+void zero_fill_bio(struct bio *bio)
+{
+ unsigned long flags;
+ struct bio_vec *bv;
+ int i;
+
+ bio_for_each_segment(bv, bio, i) {
+ char *data = bvec_kmap_irq(bv, &flags);
+ memset(data, 0, bv->bv_len);
+ flush_dcache_page(bv->bv_page);
+ bvec_kunmap_irq(data, &flags);
+ }
+}
+EXPORT_SYMBOL(zero_fill_bio);
+
/**
* bio_put - release a reference to a bio
* @bio: bio to release reference to
* the actual data it points to. Reference count of returned
* bio will be one.
*/
-inline void __bio_clone(struct bio *bio, struct bio *bio_src)
+void __bio_clone(struct bio *bio, struct bio *bio_src)
{
request_queue_t *q = bdev_get_queue(bio_src->bi_bdev);
- memcpy(bio->bi_io_vec, bio_src->bi_io_vec, bio_src->bi_max_vecs * sizeof(struct bio_vec));
+ memcpy(bio->bi_io_vec, bio_src->bi_io_vec,
+ bio_src->bi_max_vecs * sizeof(struct bio_vec));
bio->bi_sector = bio_src->bi_sector;
bio->bi_bdev = bio_src->bi_bdev;
bio->bi_flags |= 1 << BIO_CLONED;
bio->bi_rw = bio_src->bi_rw;
-
- /*
- * notes -- maybe just leave bi_idx alone. assume identical mapping
- * for the clone
- */
bio->bi_vcnt = bio_src->bi_vcnt;
bio->bi_size = bio_src->bi_size;
+ bio->bi_idx = bio_src->bi_idx;
bio_phys_segments(q, bio);
bio_hw_segments(q, bio);
}
*
* Like __bio_clone, only also allocates the returned bio
*/
-struct bio *bio_clone(struct bio *bio, int gfp_mask)
+struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask)
{
- struct bio *b = bio_alloc(gfp_mask, bio->bi_max_vecs);
+ struct bio *b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, fs_bio_set);
- if (b)
+ if (b) {
+ b->bi_destructor = bio_fs_destructor;
__bio_clone(b, bio);
+ }
return b;
}
}
static int __bio_add_page(request_queue_t *q, struct bio *bio, struct page
- *page, unsigned int len, unsigned int offset)
+ *page, unsigned int len, unsigned int offset,
+ unsigned short max_sectors)
{
int retried_segments = 0;
struct bio_vec *bvec;
if (unlikely(bio_flagged(bio, BIO_CLONED)))
return 0;
- if (bio->bi_vcnt >= bio->bi_max_vecs)
+ if (((bio->bi_size + len) >> 9) > max_sectors)
return 0;
- if (((bio->bi_size + len) >> 9) > q->max_sectors)
+ /*
+ * For filesystems with a blocksize smaller than the pagesize
+ * we will often be called with the same page as last time and
+ * a consecutive offset. Optimize this special case.
+ */
+ if (bio->bi_vcnt > 0) {
+ struct bio_vec *prev = &bio->bi_io_vec[bio->bi_vcnt - 1];
+
+ if (page == prev->bv_page &&
+ offset == prev->bv_offset + prev->bv_len) {
+ prev->bv_len += len;
+ if (q->merge_bvec_fn &&
+ q->merge_bvec_fn(q, bio, prev) < len) {
+ prev->bv_len -= len;
+ return 0;
+ }
+
+ goto done;
+ }
+ }
+
+ if (bio->bi_vcnt >= bio->bi_max_vecs)
return 0;
/*
bio->bi_vcnt++;
bio->bi_phys_segments++;
bio->bi_hw_segments++;
+ done:
bio->bi_size += len;
return len;
}
+/**
+ * bio_add_pc_page - attempt to add page to bio
+ * @q: the target queue
+ * @bio: destination bio
+ * @page: page to add
+ * @len: vec entry length
+ * @offset: vec entry offset
+ *
+ * Attempt to add a page to the bio_vec maplist. This can fail for a
+ * number of reasons, such as the bio being full or target block
+ * device limitations. The target block device must allow bio's
+ * smaller than PAGE_SIZE, so it is always possible to add a single
+ * page to an empty bio. This should only be used by REQ_PC bios.
+ */
+int bio_add_pc_page(request_queue_t *q, struct bio *bio, struct page *page,
+ unsigned int len, unsigned int offset)
+{
+ return __bio_add_page(q, bio, page, len, offset, q->max_hw_sectors);
+}
+
/**
* bio_add_page - attempt to add page to bio
* @bio: destination bio
int bio_add_page(struct bio *bio, struct page *page, unsigned int len,
unsigned int offset)
{
- return __bio_add_page(bdev_get_queue(bio->bi_bdev), bio, page,
- len, offset);
+ struct request_queue *q = bdev_get_queue(bio->bi_bdev);
+ return __bio_add_page(q, bio, page, len, offset, q->max_sectors);
}
struct bio_map_data {
break;
}
- if (__bio_add_page(q, bio, page, bytes, 0) < bytes) {
+ if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes) {
ret = -EINVAL;
break;
}
return ERR_PTR(ret);
}
-static struct bio *__bio_map_user(request_queue_t *q, struct block_device *bdev,
- unsigned long uaddr, unsigned int len,
- int write_to_vm)
+static struct bio *__bio_map_user_iov(request_queue_t *q,
+ struct block_device *bdev,
+ struct sg_iovec *iov, int iov_count,
+ int write_to_vm)
{
- unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- unsigned long start = uaddr >> PAGE_SHIFT;
- const int nr_pages = end - start;
- int ret, offset, i;
+ int i, j;
+ int nr_pages = 0;
struct page **pages;
struct bio *bio;
+ int cur_page = 0;
+ int ret, offset;
- /*
- * transfer and buffer must be aligned to at least hardsector
- * size for now, in the future we can relax this restriction
- */
- if ((uaddr & queue_dma_alignment(q)) || (len & queue_dma_alignment(q)))
+ for (i = 0; i < iov_count; i++) {
+ unsigned long uaddr = (unsigned long)iov[i].iov_base;
+ unsigned long len = iov[i].iov_len;
+ unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ unsigned long start = uaddr >> PAGE_SHIFT;
+
+ nr_pages += end - start;
+ /*
+ * transfer and buffer must be aligned to at least hardsector
+ * size for now, in the future we can relax this restriction
+ */
+ if ((uaddr & queue_dma_alignment(q)) || (len & queue_dma_alignment(q)))
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (!nr_pages)
return ERR_PTR(-EINVAL);
bio = bio_alloc(GFP_KERNEL, nr_pages);
if (!pages)
goto out;
- down_read(¤t->mm->mmap_sem);
- ret = get_user_pages(current, current->mm, uaddr, nr_pages,
- write_to_vm, 0, pages, NULL);
- up_read(¤t->mm->mmap_sem);
-
- if (ret < nr_pages)
- goto out;
-
- bio->bi_bdev = bdev;
-
- offset = uaddr & ~PAGE_MASK;
- for (i = 0; i < nr_pages; i++) {
- unsigned int bytes = PAGE_SIZE - offset;
-
- if (len <= 0)
- break;
+ memset(pages, 0, nr_pages * sizeof(struct page *));
+
+ for (i = 0; i < iov_count; i++) {
+ unsigned long uaddr = (unsigned long)iov[i].iov_base;
+ unsigned long len = iov[i].iov_len;
+ unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ unsigned long start = uaddr >> PAGE_SHIFT;
+ const int local_nr_pages = end - start;
+ const int page_limit = cur_page + local_nr_pages;
+
+ down_read(¤t->mm->mmap_sem);
+ ret = get_user_pages(current, current->mm, uaddr,
+ local_nr_pages,
+ write_to_vm, 0, &pages[cur_page], NULL);
+ up_read(¤t->mm->mmap_sem);
+
+ if (ret < local_nr_pages) {
+ ret = -EFAULT;
+ goto out_unmap;
+ }
- if (bytes > len)
- bytes = len;
+ offset = uaddr & ~PAGE_MASK;
+ for (j = cur_page; j < page_limit; j++) {
+ unsigned int bytes = PAGE_SIZE - offset;
+
+ if (len <= 0)
+ break;
+
+ if (bytes > len)
+ bytes = len;
+
+ /*
+ * sorry...
+ */
+ if (bio_add_pc_page(q, bio, pages[j], bytes, offset) <
+ bytes)
+ break;
+
+ len -= bytes;
+ offset = 0;
+ }
+ cur_page = j;
/*
- * sorry...
+ * release the pages we didn't map into the bio, if any
*/
- if (__bio_add_page(q, bio, pages[i], bytes, offset) < bytes)
- break;
-
- len -= bytes;
- offset = 0;
+ while (j < page_limit)
+ page_cache_release(pages[j++]);
}
- /*
- * release the pages we didn't map into the bio, if any
- */
- while (i < nr_pages)
- page_cache_release(pages[i++]);
-
kfree(pages);
/*
if (!write_to_vm)
bio->bi_rw |= (1 << BIO_RW);
+ bio->bi_bdev = bdev;
bio->bi_flags |= (1 << BIO_USER_MAPPED);
return bio;
-out:
+
+ out_unmap:
+ for (i = 0; i < nr_pages; i++) {
+ if(!pages[i])
+ break;
+ page_cache_release(pages[i]);
+ }
+ out:
kfree(pages);
bio_put(bio);
return ERR_PTR(ret);
/**
* bio_map_user - map user address into bio
+ * @q: the request_queue_t for the bio
* @bdev: destination block device
* @uaddr: start of user address
* @len: length in bytes
*/
struct bio *bio_map_user(request_queue_t *q, struct block_device *bdev,
unsigned long uaddr, unsigned int len, int write_to_vm)
+{
+ struct sg_iovec iov;
+
+ iov.iov_base = (void __user *)uaddr;
+ iov.iov_len = len;
+
+ return bio_map_user_iov(q, bdev, &iov, 1, write_to_vm);
+}
+
+/**
+ * bio_map_user_iov - map user sg_iovec table into bio
+ * @q: the request_queue_t for the bio
+ * @bdev: destination block device
+ * @iov: the iovec.
+ * @iov_count: number of elements in the iovec
+ * @write_to_vm: bool indicating writing to pages or not
+ *
+ * Map the user space address into a bio suitable for io to a block
+ * device. Returns an error pointer in case of error.
+ */
+struct bio *bio_map_user_iov(request_queue_t *q, struct block_device *bdev,
+ struct sg_iovec *iov, int iov_count,
+ int write_to_vm)
{
struct bio *bio;
+ int len = 0, i;
- bio = __bio_map_user(q, bdev, uaddr, len, write_to_vm);
+ bio = __bio_map_user_iov(q, bdev, iov, iov_count, write_to_vm);
if (IS_ERR(bio))
return bio;
*/
bio_get(bio);
+ for (i = 0; i < iov_count; i++)
+ len += iov[i].iov_len;
+
if (bio->bi_size == len)
return bio;
bio_put(bio);
}
+static int bio_map_kern_endio(struct bio *bio, unsigned int bytes_done, int err)
+{
+ if (bio->bi_size)
+ return 1;
+
+ bio_put(bio);
+ return 0;
+}
+
+
+static struct bio *__bio_map_kern(request_queue_t *q, void *data,
+ unsigned int len, gfp_t gfp_mask)
+{
+ unsigned long kaddr = (unsigned long)data;
+ unsigned long end = (kaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ unsigned long start = kaddr >> PAGE_SHIFT;
+ const int nr_pages = end - start;
+ int offset, i;
+ struct bio *bio;
+
+ bio = bio_alloc(gfp_mask, nr_pages);
+ if (!bio)
+ return ERR_PTR(-ENOMEM);
+
+ offset = offset_in_page(kaddr);
+ for (i = 0; i < nr_pages; i++) {
+ unsigned int bytes = PAGE_SIZE - offset;
+
+ if (len <= 0)
+ break;
+
+ if (bytes > len)
+ bytes = len;
+
+ if (bio_add_pc_page(q, bio, virt_to_page(data), bytes,
+ offset) < bytes)
+ break;
+
+ data += bytes;
+ len -= bytes;
+ offset = 0;
+ }
+
+ bio->bi_end_io = bio_map_kern_endio;
+ return bio;
+}
+
+/**
+ * bio_map_kern - map kernel address into bio
+ * @q: the request_queue_t for the bio
+ * @data: pointer to buffer to map
+ * @len: length in bytes
+ * @gfp_mask: allocation flags for bio allocation
+ *
+ * Map the kernel address into a bio suitable for io to a block
+ * device. Returns an error pointer in case of error.
+ */
+struct bio *bio_map_kern(request_queue_t *q, void *data, unsigned int len,
+ gfp_t gfp_mask)
+{
+ struct bio *bio;
+
+ bio = __bio_map_kern(q, data, len, gfp_mask);
+ if (IS_ERR(bio))
+ return bio;
+
+ if (bio->bi_size == len)
+ return bio;
+
+ /*
+ * Don't support partial mappings.
+ */
+ bio_put(bio);
+ return ERR_PTR(-EINVAL);
+}
+
/*
* bio_set_pages_dirty() and bio_check_pages_dirty() are support functions
* for performing direct-IO in BIOs.
static void bio_dirty_fn(void *data);
static DECLARE_WORK(bio_dirty_work, bio_dirty_fn, NULL);
-static spinlock_t bio_dirty_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(bio_dirty_lock);
static struct bio *bio_dirty_list;
/*
bp->bio1.bi_io_vec = &bp->bv1;
bp->bio2.bi_io_vec = &bp->bv2;
+ bp->bio1.bi_max_vecs = 1;
+ bp->bio2.bi_max_vecs = 1;
+
bp->bio1.bi_end_io = bio_pair_end_1;
bp->bio2.bi_end_io = bio_pair_end_2;
return bp;
}
-static void *bio_pair_alloc(int gfp_flags, void *data)
+static void *bio_pair_alloc(gfp_t gfp_flags, void *data)
{
return kmalloc(sizeof(struct bio_pair), gfp_flags);
}
kfree(bp);
}
-static void __init biovec_init_pools(void)
+
+/*
+ * create memory pools for biovec's in a bio_set.
+ * use the global biovec slabs created for general use.
+ */
+static int biovec_create_pools(struct bio_set *bs, int pool_entries, int scale)
{
- int i, size, megabytes, pool_entries = BIO_POOL_SIZE;
+ int i;
+
+ for (i = 0; i < BIOVEC_NR_POOLS; i++) {
+ struct biovec_slab *bp = bvec_slabs + i;
+ mempool_t **bvp = bs->bvec_pools + i;
+
+ if (i >= scale)
+ pool_entries >>= 1;
+
+ *bvp = mempool_create(pool_entries, mempool_alloc_slab,
+ mempool_free_slab, bp->slab);
+ if (!*bvp)
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static void biovec_free_pools(struct bio_set *bs)
+{
+ int i;
+
+ for (i = 0; i < BIOVEC_NR_POOLS; i++) {
+ mempool_t *bvp = bs->bvec_pools[i];
+
+ if (bvp)
+ mempool_destroy(bvp);
+ }
+
+}
+
+void bioset_free(struct bio_set *bs)
+{
+ if (bs->bio_pool)
+ mempool_destroy(bs->bio_pool);
+
+ biovec_free_pools(bs);
+
+ kfree(bs);
+}
+
+struct bio_set *bioset_create(int bio_pool_size, int bvec_pool_size, int scale)
+{
+ struct bio_set *bs = kmalloc(sizeof(*bs), GFP_KERNEL);
+
+ if (!bs)
+ return NULL;
+
+ memset(bs, 0, sizeof(*bs));
+ bs->bio_pool = mempool_create(bio_pool_size, mempool_alloc_slab,
+ mempool_free_slab, bio_slab);
+
+ if (!bs->bio_pool)
+ goto bad;
+
+ if (!biovec_create_pools(bs, bvec_pool_size, scale))
+ return bs;
+
+bad:
+ bioset_free(bs);
+ return NULL;
+}
+
+static void __init biovec_init_slabs(void)
+{
+ int i;
+
+ for (i = 0; i < BIOVEC_NR_POOLS; i++) {
+ int size;
+ struct biovec_slab *bvs = bvec_slabs + i;
+
+ size = bvs->nr_vecs * sizeof(struct bio_vec);
+ bvs->slab = kmem_cache_create(bvs->name, size, 0,
+ SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+ }
+}
+
+static int __init init_bio(void)
+{
+ int megabytes, bvec_pool_entries;
int scale = BIOVEC_NR_POOLS;
+ bio_slab = kmem_cache_create("bio", sizeof(struct bio), 0,
+ SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+
+ biovec_init_slabs();
+
megabytes = nr_free_pages() >> (20 - PAGE_SHIFT);
/*
/*
* scale number of entries
*/
- pool_entries = megabytes * 2;
- if (pool_entries > 256)
- pool_entries = 256;
-
- for (i = 0; i < BIOVEC_NR_POOLS; i++) {
- struct biovec_pool *bp = bvec_array + i;
-
- size = bp->nr_vecs * sizeof(struct bio_vec);
-
- bp->slab = kmem_cache_create(bp->name, size, 0,
- SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
-
- if (i >= scale)
- pool_entries >>= 1;
-
- bp->pool = mempool_create(pool_entries, mempool_alloc_slab,
- mempool_free_slab, bp->slab);
- if (!bp->pool)
- panic("biovec: can't init mempool\n");
- }
-}
-
-static int __init init_bio(void)
-{
- bio_slab = kmem_cache_create("bio", sizeof(struct bio), 0,
- SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
- bio_pool = mempool_create(BIO_POOL_SIZE, mempool_alloc_slab,
- mempool_free_slab, bio_slab);
- if (!bio_pool)
- panic("bio: can't create mempool\n");
+ bvec_pool_entries = megabytes * 2;
+ if (bvec_pool_entries > 256)
+ bvec_pool_entries = 256;
- biovec_init_pools();
+ fs_bio_set = bioset_create(BIO_POOL_SIZE, bvec_pool_entries, scale);
+ if (!fs_bio_set)
+ panic("bio: can't allocate bios\n");
bio_split_pool = mempool_create(BIO_SPLIT_ENTRIES,
bio_pair_alloc, bio_pair_free, NULL);
EXPORT_SYMBOL(bio_alloc);
EXPORT_SYMBOL(bio_put);
+EXPORT_SYMBOL(bio_free);
EXPORT_SYMBOL(bio_endio);
EXPORT_SYMBOL(bio_init);
EXPORT_SYMBOL(__bio_clone);
EXPORT_SYMBOL(bio_phys_segments);
EXPORT_SYMBOL(bio_hw_segments);
EXPORT_SYMBOL(bio_add_page);
+EXPORT_SYMBOL(bio_add_pc_page);
EXPORT_SYMBOL(bio_get_nr_vecs);
EXPORT_SYMBOL(bio_map_user);
EXPORT_SYMBOL(bio_unmap_user);
+EXPORT_SYMBOL(bio_map_kern);
EXPORT_SYMBOL(bio_pair_release);
EXPORT_SYMBOL(bio_split);
EXPORT_SYMBOL(bio_split_pool);
EXPORT_SYMBOL(bio_copy_user);
EXPORT_SYMBOL(bio_uncopy_user);
+EXPORT_SYMBOL(bioset_create);
+EXPORT_SYMBOL(bioset_free);
+EXPORT_SYMBOL(bio_alloc_bioset);