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- #include <linux/mm.h>
- #include <linux/swap.h>
- #include <linux/bio.h>
- #include <linux/blkdev.h>
- #include <linux/uio.h>
- #include <linux/iocontext.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/export.h>
- #include <linux/mempool.h>
- #include <linux/workqueue.h>
- #include <linux/cgroup.h>
- #include <trace/events/block.h>
- #define BIO_INLINE_VECS 4
- #define BV(x, n) { .nr_vecs = x, .name = "biovec-"#n }
- static struct biovec_slab bvec_slabs[BVEC_POOL_NR] __read_mostly = {
- BV(1, 1), BV(4, 4), BV(16, 16), BV(64, 64), BV(128, 128), BV(BIO_MAX_PAGES, max),
- };
- #undef BV
- struct bio_set *fs_bio_set;
- EXPORT_SYMBOL(fs_bio_set);
- struct bio_slab {
- struct kmem_cache *slab;
- unsigned int slab_ref;
- unsigned int slab_size;
- char name[8];
- };
- static DEFINE_MUTEX(bio_slab_lock);
- static struct bio_slab *bio_slabs;
- static unsigned int bio_slab_nr, bio_slab_max;
- static struct kmem_cache *bio_find_or_create_slab(unsigned int extra_size)
- {
- unsigned int sz = sizeof(struct bio) + extra_size;
- struct kmem_cache *slab = NULL;
- struct bio_slab *bslab, *new_bio_slabs;
- unsigned int new_bio_slab_max;
- unsigned int i, entry = -1;
- mutex_lock(&bio_slab_lock);
- i = 0;
- while (i < bio_slab_nr) {
- bslab = &bio_slabs[i];
- if (!bslab->slab && entry == -1)
- entry = i;
- else if (bslab->slab_size == sz) {
- slab = bslab->slab;
- bslab->slab_ref++;
- break;
- }
- i++;
- }
- if (slab)
- goto out_unlock;
- if (bio_slab_nr == bio_slab_max && entry == -1) {
- new_bio_slab_max = bio_slab_max << 1;
- new_bio_slabs = krealloc(bio_slabs,
- new_bio_slab_max * sizeof(struct bio_slab),
- GFP_KERNEL);
- if (!new_bio_slabs)
- goto out_unlock;
- bio_slab_max = new_bio_slab_max;
- bio_slabs = new_bio_slabs;
- }
- if (entry == -1)
- entry = bio_slab_nr++;
- bslab = &bio_slabs[entry];
- snprintf(bslab->name, sizeof(bslab->name), "bio-%d", entry);
- slab = kmem_cache_create(bslab->name, sz, ARCH_KMALLOC_MINALIGN,
- SLAB_HWCACHE_ALIGN, NULL);
- if (!slab)
- goto out_unlock;
- bslab->slab = slab;
- bslab->slab_ref = 1;
- bslab->slab_size = sz;
- out_unlock:
- mutex_unlock(&bio_slab_lock);
- return slab;
- }
- static void bio_put_slab(struct bio_set *bs)
- {
- struct bio_slab *bslab = NULL;
- unsigned int i;
- mutex_lock(&bio_slab_lock);
- for (i = 0; i < bio_slab_nr; i++) {
- if (bs->bio_slab == bio_slabs[i].slab) {
- bslab = &bio_slabs[i];
- break;
- }
- }
- if (WARN(!bslab, KERN_ERR "bio: unable to find slab!\n"))
- goto out;
- WARN_ON(!bslab->slab_ref);
- if (--bslab->slab_ref)
- goto out;
- kmem_cache_destroy(bslab->slab);
- bslab->slab = NULL;
- out:
- mutex_unlock(&bio_slab_lock);
- }
- unsigned int bvec_nr_vecs(unsigned short idx)
- {
- return bvec_slabs[--idx].nr_vecs;
- }
- void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned int idx)
- {
- if (!idx)
- return;
- idx--;
- BIO_BUG_ON(idx >= BVEC_POOL_NR);
- if (idx == BVEC_POOL_MAX) {
- mempool_free(bv, pool);
- } else {
- struct biovec_slab *bvs = bvec_slabs + idx;
- kmem_cache_free(bvs->slab, bv);
- }
- }
- struct bio_vec *bvec_alloc(gfp_t gfp_mask, int nr, unsigned long *idx,
- mempool_t *pool)
- {
- struct bio_vec *bvl;
-
- switch (nr) {
- case 1:
- *idx = 0;
- break;
- case 2 ... 4:
- *idx = 1;
- break;
- case 5 ... 16:
- *idx = 2;
- break;
- case 17 ... 64:
- *idx = 3;
- break;
- case 65 ... 128:
- *idx = 4;
- break;
- case 129 ... BIO_MAX_PAGES:
- *idx = 5;
- break;
- default:
- return NULL;
- }
-
- if (*idx == BVEC_POOL_MAX) {
- fallback:
- bvl = mempool_alloc(pool, gfp_mask);
- } else {
- struct biovec_slab *bvs = bvec_slabs + *idx;
- gfp_t __gfp_mask = gfp_mask & ~(__GFP_DIRECT_RECLAIM | __GFP_IO);
-
- __gfp_mask |= __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN;
-
- bvl = kmem_cache_alloc(bvs->slab, __gfp_mask);
- if (unlikely(!bvl && (gfp_mask & __GFP_DIRECT_RECLAIM))) {
- *idx = BVEC_POOL_MAX;
- goto fallback;
- }
- }
- (*idx)++;
- return bvl;
- }
- static void __bio_free(struct bio *bio)
- {
- bio_disassociate_task(bio);
- if (bio_integrity(bio))
- bio_integrity_free(bio);
- }
- static void bio_free(struct bio *bio)
- {
- struct bio_set *bs = bio->bi_pool;
- void *p;
- __bio_free(bio);
- if (bs) {
- bvec_free(bs->bvec_pool, bio->bi_io_vec, BVEC_POOL_IDX(bio));
-
- p = bio;
- p -= bs->front_pad;
- mempool_free(p, bs->bio_pool);
- } else {
-
- kfree(bio);
- }
- }
- void bio_init(struct bio *bio)
- {
- memset(bio, 0, sizeof(*bio));
- atomic_set(&bio->__bi_remaining, 1);
- atomic_set(&bio->__bi_cnt, 1);
- }
- EXPORT_SYMBOL(bio_init);
- void bio_reset(struct bio *bio)
- {
- unsigned long flags = bio->bi_flags & (~0UL << BIO_RESET_BITS);
- __bio_free(bio);
- memset(bio, 0, BIO_RESET_BYTES);
- bio->bi_flags = flags;
- atomic_set(&bio->__bi_remaining, 1);
- }
- EXPORT_SYMBOL(bio_reset);
- static struct bio *__bio_chain_endio(struct bio *bio)
- {
- struct bio *parent = bio->bi_private;
- if (!parent->bi_error)
- parent->bi_error = bio->bi_error;
- bio_put(bio);
- return parent;
- }
- static void bio_chain_endio(struct bio *bio)
- {
- bio_endio(__bio_chain_endio(bio));
- }
- void bio_chain(struct bio *bio, struct bio *parent)
- {
- BUG_ON(bio->bi_private || bio->bi_end_io);
- bio->bi_private = parent;
- bio->bi_end_io = bio_chain_endio;
- bio_inc_remaining(parent);
- }
- EXPORT_SYMBOL(bio_chain);
- static void bio_alloc_rescue(struct work_struct *work)
- {
- struct bio_set *bs = container_of(work, struct bio_set, rescue_work);
- struct bio *bio;
- while (1) {
- spin_lock(&bs->rescue_lock);
- bio = bio_list_pop(&bs->rescue_list);
- spin_unlock(&bs->rescue_lock);
- if (!bio)
- break;
- generic_make_request(bio);
- }
- }
- static void punt_bios_to_rescuer(struct bio_set *bs)
- {
- struct bio_list punt, nopunt;
- struct bio *bio;
-
- bio_list_init(&punt);
- bio_list_init(&nopunt);
- while ((bio = bio_list_pop(¤t->bio_list[0])))
- bio_list_add(bio->bi_pool == bs ? &punt : &nopunt, bio);
- current->bio_list[0] = nopunt;
- bio_list_init(&nopunt);
- while ((bio = bio_list_pop(¤t->bio_list[1])))
- bio_list_add(bio->bi_pool == bs ? &punt : &nopunt, bio);
- current->bio_list[1] = nopunt;
- spin_lock(&bs->rescue_lock);
- bio_list_merge(&bs->rescue_list, &punt);
- spin_unlock(&bs->rescue_lock);
- queue_work(bs->rescue_workqueue, &bs->rescue_work);
- }
- struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
- {
- gfp_t saved_gfp = gfp_mask;
- unsigned front_pad;
- unsigned inline_vecs;
- struct bio_vec *bvl = NULL;
- struct bio *bio;
- void *p;
- if (!bs) {
- if (nr_iovecs > UIO_MAXIOV)
- return NULL;
- p = kmalloc(sizeof(struct bio) +
- nr_iovecs * sizeof(struct bio_vec),
- gfp_mask);
- front_pad = 0;
- inline_vecs = nr_iovecs;
- } else {
-
- if (WARN_ON_ONCE(!bs->bvec_pool && nr_iovecs > 0))
- return NULL;
-
- if (current->bio_list &&
- (!bio_list_empty(¤t->bio_list[0]) ||
- !bio_list_empty(¤t->bio_list[1])))
- gfp_mask &= ~__GFP_DIRECT_RECLAIM;
- p = mempool_alloc(bs->bio_pool, gfp_mask);
- if (!p && gfp_mask != saved_gfp) {
- punt_bios_to_rescuer(bs);
- gfp_mask = saved_gfp;
- p = mempool_alloc(bs->bio_pool, gfp_mask);
- }
- front_pad = bs->front_pad;
- inline_vecs = BIO_INLINE_VECS;
- }
- if (unlikely(!p))
- return NULL;
- bio = p + front_pad;
- bio_init(bio);
- if (nr_iovecs > inline_vecs) {
- unsigned long idx = 0;
- bvl = bvec_alloc(gfp_mask, nr_iovecs, &idx, bs->bvec_pool);
- if (!bvl && gfp_mask != saved_gfp) {
- punt_bios_to_rescuer(bs);
- gfp_mask = saved_gfp;
- bvl = bvec_alloc(gfp_mask, nr_iovecs, &idx, bs->bvec_pool);
- }
- if (unlikely(!bvl))
- goto err_free;
- bio->bi_flags |= idx << BVEC_POOL_OFFSET;
- } else if (nr_iovecs) {
- bvl = bio->bi_inline_vecs;
- }
- bio->bi_pool = bs;
- bio->bi_max_vecs = nr_iovecs;
- bio->bi_io_vec = bvl;
- return bio;
- err_free:
- mempool_free(p, bs->bio_pool);
- return NULL;
- }
- EXPORT_SYMBOL(bio_alloc_bioset);
- void zero_fill_bio(struct bio *bio)
- {
- unsigned long flags;
- struct bio_vec bv;
- struct bvec_iter iter;
- bio_for_each_segment(bv, bio, iter) {
- 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);
- void bio_put(struct bio *bio)
- {
- if (!bio_flagged(bio, BIO_REFFED))
- bio_free(bio);
- else {
- BIO_BUG_ON(!atomic_read(&bio->__bi_cnt));
-
- if (atomic_dec_and_test(&bio->__bi_cnt))
- bio_free(bio);
- }
- }
- EXPORT_SYMBOL(bio_put);
- inline int bio_phys_segments(struct request_queue *q, struct bio *bio)
- {
- if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
- blk_recount_segments(q, bio);
- return bio->bi_phys_segments;
- }
- EXPORT_SYMBOL(bio_phys_segments);
- static inline void bio_clone_crypt_key(struct bio *dst, const struct bio *src)
- {
- #ifdef CONFIG_PFK
- dst->bi_iter.bi_dun = src->bi_iter.bi_dun;
- #ifdef CONFIG_DM_DEFAULT_KEY
- dst->bi_crypt_key = src->bi_crypt_key;
- dst->bi_crypt_skip = src->bi_crypt_skip;
- #endif
- dst->bi_dio_inode = src->bi_dio_inode;
- #endif
- }
- void __bio_clone_fast(struct bio *bio, struct bio *bio_src)
- {
- BUG_ON(bio->bi_pool && BVEC_POOL_IDX(bio));
-
- bio->bi_bdev = bio_src->bi_bdev;
- bio_set_flag(bio, BIO_CLONED);
- bio->bi_opf = bio_src->bi_opf;
- bio->bi_iter = bio_src->bi_iter;
- bio->bi_io_vec = bio_src->bi_io_vec;
- bio_clone_crypt_key(bio, bio_src);
- bio_clone_blkcg_association(bio, bio_src);
- }
- EXPORT_SYMBOL(__bio_clone_fast);
- struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs)
- {
- struct bio *b;
- b = bio_alloc_bioset(gfp_mask, 0, bs);
- if (!b)
- return NULL;
- __bio_clone_fast(b, bio);
- if (bio_integrity(bio)) {
- int ret;
- ret = bio_integrity_clone(b, bio, gfp_mask);
- if (ret < 0) {
- bio_put(b);
- return NULL;
- }
- }
- return b;
- }
- EXPORT_SYMBOL(bio_clone_fast);
- struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
- struct bio_set *bs)
- {
- struct bvec_iter iter;
- struct bio_vec bv;
- struct bio *bio;
-
- bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs);
- if (!bio)
- return NULL;
- bio->bi_bdev = bio_src->bi_bdev;
- bio->bi_opf = bio_src->bi_opf;
- bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector;
- bio->bi_iter.bi_size = bio_src->bi_iter.bi_size;
- switch (bio_op(bio)) {
- case REQ_OP_DISCARD:
- case REQ_OP_SECURE_ERASE:
- break;
- case REQ_OP_WRITE_SAME:
- bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
- break;
- default:
- bio_for_each_segment(bv, bio_src, iter)
- bio->bi_io_vec[bio->bi_vcnt++] = bv;
- break;
- }
- if (bio_integrity(bio_src)) {
- int ret;
- ret = bio_integrity_clone(bio, bio_src, gfp_mask);
- if (ret < 0) {
- bio_put(bio);
- return NULL;
- }
- }
- bio_clone_crypt_key(bio, bio_src);
- bio_clone_blkcg_association(bio, bio_src);
- return bio;
- }
- EXPORT_SYMBOL(bio_clone_bioset);
- int bio_add_pc_page(struct request_queue *q, struct bio *bio, struct page
- *page, unsigned int len, unsigned int offset)
- {
- int retried_segments = 0;
- struct bio_vec *bvec;
-
- if (unlikely(bio_flagged(bio, BIO_CLONED)))
- return 0;
- if (((bio->bi_iter.bi_size + len) >> 9) > queue_max_hw_sectors(q))
- return 0;
-
- 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;
- bio->bi_iter.bi_size += len;
- goto done;
- }
-
- if (bvec_gap_to_prev(q, prev, offset))
- return 0;
- }
- if (bio->bi_vcnt >= bio->bi_max_vecs)
- return 0;
-
- bvec = &bio->bi_io_vec[bio->bi_vcnt];
- bvec->bv_page = page;
- bvec->bv_len = len;
- bvec->bv_offset = offset;
- bio->bi_vcnt++;
- bio->bi_phys_segments++;
- bio->bi_iter.bi_size += len;
-
- while (bio->bi_phys_segments > queue_max_segments(q)) {
- if (retried_segments)
- goto failed;
- retried_segments = 1;
- blk_recount_segments(q, bio);
- }
-
- if (bio->bi_vcnt > 1 && (BIOVEC_PHYS_MERGEABLE(bvec-1, bvec)))
- bio_clear_flag(bio, BIO_SEG_VALID);
- done:
- return len;
- failed:
- bvec->bv_page = NULL;
- bvec->bv_len = 0;
- bvec->bv_offset = 0;
- bio->bi_vcnt--;
- bio->bi_iter.bi_size -= len;
- blk_recount_segments(q, bio);
- return 0;
- }
- EXPORT_SYMBOL(bio_add_pc_page);
- int bio_add_page(struct bio *bio, struct page *page,
- unsigned int len, unsigned int offset)
- {
- struct bio_vec *bv;
-
- if (WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)))
- return 0;
-
- if (bio->bi_vcnt > 0) {
- bv = &bio->bi_io_vec[bio->bi_vcnt - 1];
- if (page == bv->bv_page &&
- offset == bv->bv_offset + bv->bv_len) {
- bv->bv_len += len;
- goto done;
- }
- }
- if (bio->bi_vcnt >= bio->bi_max_vecs)
- return 0;
- bv = &bio->bi_io_vec[bio->bi_vcnt];
- bv->bv_page = page;
- bv->bv_len = len;
- bv->bv_offset = offset;
- bio->bi_vcnt++;
- done:
- bio->bi_iter.bi_size += len;
- if (!bio_flagged(bio, BIO_WORKINGSET) && unlikely(PageWorkingset(page)))
- bio_set_flag(bio, BIO_WORKINGSET);
- return len;
- }
- EXPORT_SYMBOL(bio_add_page);
- struct submit_bio_ret {
- struct completion event;
- int error;
- };
- static void submit_bio_wait_endio(struct bio *bio)
- {
- struct submit_bio_ret *ret = bio->bi_private;
- ret->error = bio->bi_error;
- complete(&ret->event);
- }
- int submit_bio_wait(struct bio *bio)
- {
- struct submit_bio_ret ret;
- init_completion(&ret.event);
- bio->bi_private = &ret;
- bio->bi_end_io = submit_bio_wait_endio;
- bio->bi_opf |= REQ_SYNC;
- submit_bio(bio);
- wait_for_completion_io(&ret.event);
- return ret.error;
- }
- EXPORT_SYMBOL(submit_bio_wait);
- void bio_advance(struct bio *bio, unsigned bytes)
- {
- if (bio_integrity(bio))
- bio_integrity_advance(bio, bytes);
- bio_advance_iter(bio, &bio->bi_iter, bytes);
- }
- EXPORT_SYMBOL(bio_advance);
- 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);
- void bio_copy_data(struct bio *dst, struct bio *src)
- {
- struct bvec_iter src_iter, dst_iter;
- struct bio_vec src_bv, dst_bv;
- void *src_p, *dst_p;
- unsigned bytes;
- src_iter = src->bi_iter;
- dst_iter = dst->bi_iter;
- while (1) {
- if (!src_iter.bi_size) {
- src = src->bi_next;
- if (!src)
- break;
- src_iter = src->bi_iter;
- }
- if (!dst_iter.bi_size) {
- dst = dst->bi_next;
- if (!dst)
- break;
- dst_iter = dst->bi_iter;
- }
- src_bv = bio_iter_iovec(src, src_iter);
- dst_bv = bio_iter_iovec(dst, dst_iter);
- bytes = min(src_bv.bv_len, dst_bv.bv_len);
- src_p = kmap_atomic(src_bv.bv_page);
- dst_p = kmap_atomic(dst_bv.bv_page);
- memcpy(dst_p + dst_bv.bv_offset,
- src_p + src_bv.bv_offset,
- bytes);
- kunmap_atomic(dst_p);
- kunmap_atomic(src_p);
- bio_advance_iter(src, &src_iter, bytes);
- bio_advance_iter(dst, &dst_iter, bytes);
- }
- }
- EXPORT_SYMBOL(bio_copy_data);
- struct bio_map_data {
- int is_our_pages;
- struct iov_iter iter;
- struct iovec iov[];
- };
- static struct bio_map_data *bio_alloc_map_data(unsigned int iov_count,
- gfp_t gfp_mask)
- {
- if (iov_count > UIO_MAXIOV)
- return NULL;
- return kmalloc(sizeof(struct bio_map_data) +
- sizeof(struct iovec) * iov_count, gfp_mask);
- }
- static int bio_copy_from_iter(struct bio *bio, struct iov_iter iter)
- {
- int i;
- struct bio_vec *bvec;
- bio_for_each_segment_all(bvec, bio, i) {
- ssize_t ret;
- ret = copy_page_from_iter(bvec->bv_page,
- bvec->bv_offset,
- bvec->bv_len,
- &iter);
- if (!iov_iter_count(&iter))
- break;
- if (ret < bvec->bv_len)
- return -EFAULT;
- }
- return 0;
- }
- static int bio_copy_to_iter(struct bio *bio, struct iov_iter iter)
- {
- int i;
- struct bio_vec *bvec;
- bio_for_each_segment_all(bvec, bio, i) {
- ssize_t ret;
- ret = copy_page_to_iter(bvec->bv_page,
- bvec->bv_offset,
- bvec->bv_len,
- &iter);
- if (!iov_iter_count(&iter))
- break;
- if (ret < bvec->bv_len)
- return -EFAULT;
- }
- return 0;
- }
- void bio_free_pages(struct bio *bio)
- {
- struct bio_vec *bvec;
- int i;
- bio_for_each_segment_all(bvec, bio, i)
- __free_page(bvec->bv_page);
- }
- EXPORT_SYMBOL(bio_free_pages);
- int bio_uncopy_user(struct bio *bio)
- {
- struct bio_map_data *bmd = bio->bi_private;
- int ret = 0;
- if (!bio_flagged(bio, BIO_NULL_MAPPED)) {
-
- if (!current->mm)
- ret = -EINTR;
- else if (bio_data_dir(bio) == READ)
- ret = bio_copy_to_iter(bio, bmd->iter);
- if (bmd->is_our_pages)
- bio_free_pages(bio);
- }
- kfree(bmd);
- bio_put(bio);
- return ret;
- }
- struct bio *bio_copy_user_iov(struct request_queue *q,
- struct rq_map_data *map_data,
- const struct iov_iter *iter,
- gfp_t gfp_mask)
- {
- struct bio_map_data *bmd;
- struct page *page;
- struct bio *bio;
- int i, ret;
- int nr_pages = 0;
- unsigned int len = iter->count;
- unsigned int offset = map_data ? offset_in_page(map_data->offset) : 0;
- for (i = 0; i < iter->nr_segs; i++) {
- unsigned long uaddr;
- unsigned long end;
- unsigned long start;
- uaddr = (unsigned long) iter->iov[i].iov_base;
- end = (uaddr + iter->iov[i].iov_len + PAGE_SIZE - 1)
- >> PAGE_SHIFT;
- start = uaddr >> PAGE_SHIFT;
-
- if (end < start)
- return ERR_PTR(-EINVAL);
- nr_pages += end - start;
- }
- if (offset)
- nr_pages++;
- bmd = bio_alloc_map_data(iter->nr_segs, gfp_mask);
- if (!bmd)
- return ERR_PTR(-ENOMEM);
-
- bmd->is_our_pages = map_data ? 0 : 1;
- memcpy(bmd->iov, iter->iov, sizeof(struct iovec) * iter->nr_segs);
- bmd->iter = *iter;
- bmd->iter.iov = bmd->iov;
- ret = -ENOMEM;
- bio = bio_kmalloc(gfp_mask, nr_pages);
- if (!bio)
- goto out_bmd;
- if (iter->type & WRITE)
- bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
- ret = 0;
- if (map_data) {
- nr_pages = 1 << map_data->page_order;
- i = map_data->offset / PAGE_SIZE;
- }
- while (len) {
- unsigned int bytes = PAGE_SIZE;
- bytes -= offset;
- if (bytes > len)
- bytes = len;
- if (map_data) {
- if (i == map_data->nr_entries * nr_pages) {
- ret = -ENOMEM;
- break;
- }
- page = map_data->pages[i / nr_pages];
- page += (i % nr_pages);
- i++;
- } else {
- page = alloc_page(q->bounce_gfp | gfp_mask);
- if (!page) {
- ret = -ENOMEM;
- break;
- }
- }
- if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes) {
- if (!map_data)
- __free_page(page);
- break;
- }
- len -= bytes;
- offset = 0;
- }
- if (ret)
- goto cleanup;
-
- if (((iter->type & WRITE) && (!map_data || !map_data->null_mapped)) ||
- (map_data && map_data->from_user)) {
- ret = bio_copy_from_iter(bio, *iter);
- if (ret)
- goto cleanup;
- }
- bio->bi_private = bmd;
- return bio;
- cleanup:
- if (!map_data)
- bio_free_pages(bio);
- bio_put(bio);
- out_bmd:
- kfree(bmd);
- return ERR_PTR(ret);
- }
- struct bio *bio_map_user_iov(struct request_queue *q,
- const struct iov_iter *iter,
- gfp_t gfp_mask)
- {
- int j;
- int nr_pages = 0;
- struct page **pages;
- struct bio *bio;
- int cur_page = 0;
- int ret, offset;
- struct iov_iter i;
- struct iovec iov;
- struct bio_vec *bvec;
- iov_for_each(iov, i, *iter) {
- unsigned long uaddr = (unsigned long) iov.iov_base;
- unsigned long len = iov.iov_len;
- unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- unsigned long start = uaddr >> PAGE_SHIFT;
-
- if (end < start)
- return ERR_PTR(-EINVAL);
- nr_pages += end - start;
-
- if (uaddr & queue_dma_alignment(q))
- return ERR_PTR(-EINVAL);
- }
- if (!nr_pages)
- return ERR_PTR(-EINVAL);
- bio = bio_kmalloc(gfp_mask, nr_pages);
- if (!bio)
- return ERR_PTR(-ENOMEM);
- ret = -ENOMEM;
- pages = kcalloc(nr_pages, sizeof(struct page *), gfp_mask);
- if (!pages)
- goto out;
- iov_for_each(iov, i, *iter) {
- unsigned long uaddr = (unsigned long) iov.iov_base;
- unsigned long len = iov.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;
- ret = get_user_pages_fast(uaddr, local_nr_pages,
- (iter->type & WRITE) != WRITE,
- &pages[cur_page]);
- if (unlikely(ret < local_nr_pages)) {
- for (j = cur_page; j < page_limit; j++) {
- if (!pages[j])
- break;
- put_page(pages[j]);
- }
- ret = -EFAULT;
- goto out_unmap;
- }
- offset = offset_in_page(uaddr);
- for (j = cur_page; j < page_limit; j++) {
- unsigned int bytes = PAGE_SIZE - offset;
- unsigned short prev_bi_vcnt = bio->bi_vcnt;
- if (len <= 0)
- break;
-
- if (bytes > len)
- bytes = len;
-
- if (bio_add_pc_page(q, bio, pages[j], bytes, offset) <
- bytes)
- break;
-
- if (bio->bi_vcnt == prev_bi_vcnt)
- put_page(pages[j]);
- len -= bytes;
- offset = 0;
- }
- cur_page = j;
-
- while (j < page_limit)
- put_page(pages[j++]);
- }
- kfree(pages);
-
- if (iter->type & WRITE)
- bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
- bio_set_flag(bio, BIO_USER_MAPPED);
-
- bio_get(bio);
- return bio;
- out_unmap:
- bio_for_each_segment_all(bvec, bio, j) {
- put_page(bvec->bv_page);
- }
- out:
- kfree(pages);
- bio_put(bio);
- return ERR_PTR(ret);
- }
- static void __bio_unmap_user(struct bio *bio)
- {
- struct bio_vec *bvec;
- int i;
-
- bio_for_each_segment_all(bvec, bio, i) {
- if (bio_data_dir(bio) == READ)
- set_page_dirty_lock(bvec->bv_page);
- put_page(bvec->bv_page);
- }
- bio_put(bio);
- }
- void bio_unmap_user(struct bio *bio)
- {
- __bio_unmap_user(bio);
- bio_put(bio);
- }
- static void bio_map_kern_endio(struct bio *bio)
- {
- bio_put(bio);
- }
- struct bio *bio_map_kern(struct request_queue *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_kmalloc(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) {
-
- bio_put(bio);
- return ERR_PTR(-EINVAL);
- }
- data += bytes;
- len -= bytes;
- offset = 0;
- }
- bio->bi_end_io = bio_map_kern_endio;
- return bio;
- }
- EXPORT_SYMBOL(bio_map_kern);
- static void bio_copy_kern_endio(struct bio *bio)
- {
- bio_free_pages(bio);
- bio_put(bio);
- }
- static void bio_copy_kern_endio_read(struct bio *bio)
- {
- char *p = bio->bi_private;
- struct bio_vec *bvec;
- int i;
- bio_for_each_segment_all(bvec, bio, i) {
- memcpy(p, page_address(bvec->bv_page), bvec->bv_len);
- p += bvec->bv_len;
- }
- bio_copy_kern_endio(bio);
- }
- 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;
- struct bio *bio;
- void *p = data;
- int nr_pages = 0;
-
- if (end < start)
- return ERR_PTR(-EINVAL);
- nr_pages = end - start;
- bio = bio_kmalloc(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)
- goto cleanup;
- if (!reading)
- memcpy(page_address(page), p, bytes);
- if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes)
- break;
- len -= bytes;
- p += bytes;
- }
- if (reading) {
- bio->bi_end_io = bio_copy_kern_endio_read;
- bio->bi_private = data;
- } else {
- bio->bi_end_io = bio_copy_kern_endio;
- bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
- }
- return bio;
- cleanup:
- bio_free_pages(bio);
- bio_put(bio);
- return ERR_PTR(-ENOMEM);
- }
- void bio_set_pages_dirty(struct bio *bio)
- {
- struct bio_vec *bvec;
- int i;
- bio_for_each_segment_all(bvec, bio, i) {
- struct page *page = bvec->bv_page;
- if (page && !PageCompound(page))
- set_page_dirty_lock(page);
- }
- }
- static void bio_release_pages(struct bio *bio)
- {
- struct bio_vec *bvec;
- int i;
- bio_for_each_segment_all(bvec, bio, i) {
- struct page *page = bvec->bv_page;
- if (page)
- put_page(page);
- }
- }
- static void bio_dirty_fn(struct work_struct *work);
- static DECLARE_WORK(bio_dirty_work, bio_dirty_fn);
- static DEFINE_SPINLOCK(bio_dirty_lock);
- static struct bio *bio_dirty_list;
- static void bio_dirty_fn(struct work_struct *work)
- {
- unsigned long flags;
- struct bio *bio;
- spin_lock_irqsave(&bio_dirty_lock, flags);
- bio = bio_dirty_list;
- bio_dirty_list = NULL;
- spin_unlock_irqrestore(&bio_dirty_lock, flags);
- while (bio) {
- struct bio *next = bio->bi_private;
- bio_set_pages_dirty(bio);
- bio_release_pages(bio);
- bio_put(bio);
- bio = next;
- }
- }
- void bio_check_pages_dirty(struct bio *bio)
- {
- struct bio_vec *bvec;
- int nr_clean_pages = 0;
- int i;
- bio_for_each_segment_all(bvec, bio, i) {
- struct page *page = bvec->bv_page;
- if (PageDirty(page) || PageCompound(page)) {
- put_page(page);
- bvec->bv_page = NULL;
- } else {
- nr_clean_pages++;
- }
- }
- if (nr_clean_pages) {
- unsigned long flags;
- spin_lock_irqsave(&bio_dirty_lock, flags);
- bio->bi_private = bio_dirty_list;
- bio_dirty_list = bio;
- spin_unlock_irqrestore(&bio_dirty_lock, flags);
- schedule_work(&bio_dirty_work);
- } else {
- bio_put(bio);
- }
- }
- void generic_start_io_acct(int rw, unsigned long sectors,
- struct hd_struct *part)
- {
- int cpu = part_stat_lock();
- part_round_stats(cpu, part);
- part_stat_inc(cpu, part, ios[rw]);
- part_stat_add(cpu, part, sectors[rw], sectors);
- part_inc_in_flight(part, rw);
- part_stat_unlock();
- }
- EXPORT_SYMBOL(generic_start_io_acct);
- void generic_end_io_acct(int rw, struct hd_struct *part,
- unsigned long start_time)
- {
- unsigned long duration = jiffies - start_time;
- int cpu = part_stat_lock();
- part_stat_add(cpu, part, ticks[rw], duration);
- part_round_stats(cpu, part);
- part_dec_in_flight(part, rw);
- part_stat_unlock();
- }
- EXPORT_SYMBOL(generic_end_io_acct);
- #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
- void bio_flush_dcache_pages(struct bio *bi)
- {
- struct bio_vec bvec;
- struct bvec_iter iter;
- bio_for_each_segment(bvec, bi, iter)
- flush_dcache_page(bvec.bv_page);
- }
- EXPORT_SYMBOL(bio_flush_dcache_pages);
- #endif
- static inline bool bio_remaining_done(struct bio *bio)
- {
-
- if (!bio_flagged(bio, BIO_CHAIN))
- return true;
- BUG_ON(atomic_read(&bio->__bi_remaining) <= 0);
- if (atomic_dec_and_test(&bio->__bi_remaining)) {
- bio_clear_flag(bio, BIO_CHAIN);
- return true;
- }
- return false;
- }
- void bio_endio(struct bio *bio)
- {
- again:
- if (!bio_remaining_done(bio))
- return;
-
- if (bio->bi_end_io == bio_chain_endio) {
- bio = __bio_chain_endio(bio);
- goto again;
- }
- if (bio->bi_end_io)
- bio->bi_end_io(bio);
- }
- EXPORT_SYMBOL(bio_endio);
- struct bio *bio_split(struct bio *bio, int sectors,
- gfp_t gfp, struct bio_set *bs)
- {
- struct bio *split = NULL;
- BUG_ON(sectors <= 0);
- BUG_ON(sectors >= bio_sectors(bio));
-
- if (bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_SECURE_ERASE)
- split = bio_clone_bioset(bio, gfp, bs);
- else
- split = bio_clone_fast(bio, gfp, bs);
- if (!split)
- return NULL;
- split->bi_iter.bi_size = sectors << 9;
- if (bio_integrity(split))
- bio_integrity_trim(split, 0, sectors);
- bio_advance(bio, split->bi_iter.bi_size);
- return split;
- }
- EXPORT_SYMBOL(bio_split);
- void bio_trim(struct bio *bio, int offset, int size)
- {
-
- size <<= 9;
- if (offset == 0 && size == bio->bi_iter.bi_size)
- return;
- bio_clear_flag(bio, BIO_SEG_VALID);
- bio_advance(bio, offset << 9);
- bio->bi_iter.bi_size = size;
- }
- EXPORT_SYMBOL_GPL(bio_trim);
- mempool_t *biovec_create_pool(int pool_entries)
- {
- struct biovec_slab *bp = bvec_slabs + BVEC_POOL_MAX;
- return mempool_create_slab_pool(pool_entries, bp->slab);
- }
- void bioset_free(struct bio_set *bs)
- {
- if (bs->rescue_workqueue)
- destroy_workqueue(bs->rescue_workqueue);
- if (bs->bio_pool)
- mempool_destroy(bs->bio_pool);
- if (bs->bvec_pool)
- mempool_destroy(bs->bvec_pool);
- bioset_integrity_free(bs);
- bio_put_slab(bs);
- kfree(bs);
- }
- EXPORT_SYMBOL(bioset_free);
- static struct bio_set *__bioset_create(unsigned int pool_size,
- unsigned int front_pad,
- bool create_bvec_pool)
- {
- unsigned int back_pad = BIO_INLINE_VECS * sizeof(struct bio_vec);
- struct bio_set *bs;
- bs = kzalloc(sizeof(*bs), GFP_KERNEL);
- if (!bs)
- return NULL;
- bs->front_pad = front_pad;
- spin_lock_init(&bs->rescue_lock);
- bio_list_init(&bs->rescue_list);
- INIT_WORK(&bs->rescue_work, bio_alloc_rescue);
- bs->bio_slab = bio_find_or_create_slab(front_pad + back_pad);
- if (!bs->bio_slab) {
- kfree(bs);
- return NULL;
- }
- bs->bio_pool = mempool_create_slab_pool(pool_size, bs->bio_slab);
- if (!bs->bio_pool)
- goto bad;
- if (create_bvec_pool) {
- bs->bvec_pool = biovec_create_pool(pool_size);
- if (!bs->bvec_pool)
- goto bad;
- }
- bs->rescue_workqueue = alloc_workqueue("bioset", WQ_MEM_RECLAIM, 0);
- if (!bs->rescue_workqueue)
- goto bad;
- return bs;
- bad:
- bioset_free(bs);
- return NULL;
- }
- struct bio_set *bioset_create(unsigned int pool_size, unsigned int front_pad)
- {
- return __bioset_create(pool_size, front_pad, true);
- }
- EXPORT_SYMBOL(bioset_create);
- struct bio_set *bioset_create_nobvec(unsigned int pool_size, unsigned int front_pad)
- {
- return __bioset_create(pool_size, front_pad, false);
- }
- EXPORT_SYMBOL(bioset_create_nobvec);
- #ifdef CONFIG_BLK_CGROUP
- int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css)
- {
- if (unlikely(bio->bi_css))
- return -EBUSY;
- css_get(blkcg_css);
- bio->bi_css = blkcg_css;
- return 0;
- }
- EXPORT_SYMBOL_GPL(bio_associate_blkcg);
- int bio_associate_current(struct bio *bio)
- {
- struct io_context *ioc;
- if (bio->bi_css)
- return -EBUSY;
- ioc = current->io_context;
- if (!ioc)
- return -ENOENT;
- get_io_context_active(ioc);
- bio->bi_ioc = ioc;
- bio->bi_css = task_get_css(current, io_cgrp_id);
- return 0;
- }
- EXPORT_SYMBOL_GPL(bio_associate_current);
- void bio_disassociate_task(struct bio *bio)
- {
- if (bio->bi_ioc) {
- put_io_context(bio->bi_ioc);
- bio->bi_ioc = NULL;
- }
- if (bio->bi_css) {
- css_put(bio->bi_css);
- bio->bi_css = NULL;
- }
- }
- void bio_clone_blkcg_association(struct bio *dst, struct bio *src)
- {
- if (src->bi_css)
- WARN_ON(bio_associate_blkcg(dst, src->bi_css));
- }
- #endif
- static void __init biovec_init_slabs(void)
- {
- int i;
- for (i = 0; i < BVEC_POOL_NR; i++) {
- int size;
- struct biovec_slab *bvs = bvec_slabs + i;
- if (bvs->nr_vecs <= BIO_INLINE_VECS) {
- bvs->slab = NULL;
- continue;
- }
- size = bvs->nr_vecs * sizeof(struct bio_vec);
- bvs->slab = kmem_cache_create(bvs->name, size, 0,
- SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
- }
- }
- static int __init init_bio(void)
- {
- bio_slab_max = 2;
- bio_slab_nr = 0;
- bio_slabs = kzalloc(bio_slab_max * sizeof(struct bio_slab), GFP_KERNEL);
- if (!bio_slabs)
- panic("bio: can't allocate bios\n");
- bio_integrity_init();
- biovec_init_slabs();
- fs_bio_set = bioset_create(BIO_POOL_SIZE, 0);
- if (!fs_bio_set)
- panic("bio: can't allocate bios\n");
- if (bioset_integrity_create(fs_bio_set, BIO_POOL_SIZE))
- panic("bio: can't create integrity pool\n");
- return 0;
- }
- subsys_initcall(init_bio);
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