#include <linux/blktrace_api.h>
#include <scsi/sg.h> /* for struct sg_iovec */
-#define BIO_POOL_SIZE 2
-
static struct kmem_cache *bio_slab __read_mostly;
-#define BIOVEC_NR_POOLS 6
-
-/*
- * a small number of entries is fine, not going to be performance critical.
- * basically we just need to survive
- */
-#define BIO_SPLIT_ENTRIES 2
mempool_t *bio_split_pool __read_mostly;
-struct biovec_slab {
- int nr_vecs;
- char *name;
- struct kmem_cache *slab;
-};
-
/*
* if you change this list, also change bvec_alloc or things will
* break badly! cannot be bigger than what you can fit into an
};
#undef BV
-/*
- * 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;
+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)
+unsigned int bvec_nr_vecs(unsigned short idx)
+{
+ return bvec_slabs[idx].nr_vecs;
+}
+
+struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs)
{
struct bio_vec *bvl;
mempool_free(bio->bi_io_vec, bio_set->bvec_pools[pool_idx]);
}
+ if (bio_integrity(bio))
+ bio_integrity_free(bio, bio_set);
+
mempool_free(bio, bio_set->bio_pool);
}
bio_init(bio);
if (likely(nr_iovecs)) {
- unsigned long idx = 0; /* shut up gcc */
+ unsigned long uninitialized_var(idx);
bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs);
if (unlikely(!bvl)) {
{
struct bio *b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, fs_bio_set);
- if (b) {
- b->bi_destructor = bio_fs_destructor;
- __bio_clone(b, bio);
+ if (!b)
+ return NULL;
+
+ b->bi_destructor = bio_fs_destructor;
+ __bio_clone(b, bio);
+
+ if (bio_integrity(bio)) {
+ int ret;
+
+ ret = bio_integrity_clone(b, bio, fs_bio_set);
+
+ if (ret < 0)
+ return NULL;
}
return b;
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;
+
+ if (q->merge_bvec_fn) {
+ struct bvec_merge_data bvm = {
+ .bi_bdev = bio->bi_bdev,
+ .bi_sector = bio->bi_sector,
+ .bi_size = bio->bi_size,
+ .bi_rw = bio->bi_rw,
+ };
+
+ if (q->merge_bvec_fn(q, &bvm, prev) < len) {
+ prev->bv_len -= len;
+ return 0;
+ }
}
goto done;
* queue to get further control
*/
if (q->merge_bvec_fn) {
+ struct bvec_merge_data bvm = {
+ .bi_bdev = bio->bi_bdev,
+ .bi_sector = bio->bi_sector,
+ .bi_size = bio->bi_size,
+ .bi_rw = bio->bi_rw,
+ };
+
/*
* merge_bvec_fn() returns number of bytes it can accept
* at this offset
*/
- if (q->merge_bvec_fn(q, bio, bvec) < len) {
+ if (q->merge_bvec_fn(q, &bvm, bvec) < len) {
bvec->bv_page = NULL;
bvec->bv_len = 0;
bvec->bv_offset = 0;
return ERR_PTR(-EINVAL);
}
+static void bio_copy_kern_endio(struct bio *bio, int err)
+{
+ struct bio_vec *bvec;
+ const int read = bio_data_dir(bio) == READ;
+ char *p = bio->bi_private;
+ int i;
+
+ __bio_for_each_segment(bvec, bio, i, 0) {
+ char *addr = page_address(bvec->bv_page);
+
+ if (read && !err)
+ memcpy(p, addr, bvec->bv_len);
+
+ __free_page(bvec->bv_page);
+ p += bvec->bv_len;
+ }
+
+ bio_put(bio);
+}
+
+/**
+ * bio_copy_kern - copy kernel address into bio
+ * @q: the struct request_queue for the bio
+ * @data: pointer to buffer to copy
+ * @len: length in bytes
+ * @gfp_mask: allocation flags for bio and page allocation
+ * @reading: data direction is READ
+ *
+ * copy the kernel address into a bio suitable for io to a block
+ * device. Returns an error pointer in case of error.
+ */
+struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
+ gfp_t gfp_mask, int reading)
+{
+ 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;
+ struct bio *bio;
+ struct bio_vec *bvec;
+ int i, ret;
+
+ bio = bio_alloc(gfp_mask, nr_pages);
+ if (!bio)
+ return ERR_PTR(-ENOMEM);
+
+ while (len) {
+ struct page *page;
+ unsigned int bytes = PAGE_SIZE;
+
+ if (bytes > len)
+ bytes = len;
+
+ page = alloc_page(q->bounce_gfp | gfp_mask);
+ if (!page) {
+ ret = -ENOMEM;
+ goto cleanup;
+ }
+
+ if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes) {
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ len -= bytes;
+ }
+
+ if (!reading) {
+ void *p = data;
+
+ bio_for_each_segment(bvec, bio, i) {
+ char *addr = page_address(bvec->bv_page);
+
+ memcpy(addr, p, bvec->bv_len);
+ p += bvec->bv_len;
+ }
+ }
+
+ bio->bi_private = data;
+ bio->bi_end_io = bio_copy_kern_endio;
+ return bio;
+cleanup:
+ bio_for_each_segment(bvec, bio, i)
+ __free_page(bvec->bv_page);
+
+ bio_put(bio);
+
+ return ERR_PTR(ret);
+}
+
/*
* bio_set_pages_dirty() and bio_check_pages_dirty() are support functions
* for performing direct-IO in BIOs.
bp->bio1.bi_private = bi;
bp->bio2.bi_private = pool;
+ if (bio_integrity(bi))
+ bio_integrity_split(bi, bp, first_sectors);
+
return bp;
}
if (bs->bio_pool)
mempool_destroy(bs->bio_pool);
+ bioset_integrity_free(bs);
biovec_free_pools(bs);
kfree(bs);
if (!bs->bio_pool)
goto bad;
+ if (bioset_integrity_create(bs, bio_pool_size))
+ goto bad;
+
if (!biovec_create_pools(bs, bvec_pool_size))
return bs;
{
bio_slab = KMEM_CACHE(bio, SLAB_HWCACHE_ALIGN|SLAB_PANIC);
+ bio_integrity_init_slab();
biovec_init_slabs();
fs_bio_set = bioset_create(BIO_POOL_SIZE, 2);
EXPORT_SYMBOL(bio_map_user);
EXPORT_SYMBOL(bio_unmap_user);
EXPORT_SYMBOL(bio_map_kern);
+EXPORT_SYMBOL(bio_copy_kern);
EXPORT_SYMBOL(bio_pair_release);
EXPORT_SYMBOL(bio_split);
EXPORT_SYMBOL(bio_split_pool);
git.openpandora.org / pandora-kernel.git / blobdiff