| /* |
| * 2.5 block I/O model |
| * |
| * Copyright (C) 2001 Jens Axboe <axboe@suse.de> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public Licens |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- |
| */ |
| #ifndef __LINUX_BIO_H |
| #define __LINUX_BIO_H |
| |
| #include <linux/highmem.h> |
| #include <linux/mempool.h> |
| #include <linux/ioprio.h> |
| #include <linux/bug.h> |
| |
| #ifdef CONFIG_BLOCK |
| |
| #include <asm/io.h> |
| |
| /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */ |
| #include <linux/blk_types.h> |
| |
| #define BIO_DEBUG |
| |
| #ifdef BIO_DEBUG |
| #define BIO_BUG_ON BUG_ON |
| #else |
| #define BIO_BUG_ON |
| #endif |
| |
| #define BIO_MAX_PAGES 256 |
| #define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT) |
| #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) |
| |
| /* |
| * upper 16 bits of bi_rw define the io priority of this bio |
| */ |
| #define BIO_PRIO_SHIFT (8 * sizeof(unsigned long) - IOPRIO_BITS) |
| #define bio_prio(bio) ((bio)->bi_rw >> BIO_PRIO_SHIFT) |
| #define bio_prio_valid(bio) ioprio_valid(bio_prio(bio)) |
| |
| #define bio_set_prio(bio, prio) do { \ |
| WARN_ON(prio >= (1 << IOPRIO_BITS)); \ |
| (bio)->bi_rw &= ((1UL << BIO_PRIO_SHIFT) - 1); \ |
| (bio)->bi_rw |= ((unsigned long) (prio) << BIO_PRIO_SHIFT); \ |
| } while (0) |
| |
| /* |
| * various member access, note that bio_data should of course not be used |
| * on highmem page vectors |
| */ |
| #define __bvec_iter_bvec(bvec, iter) (&(bvec)[(iter).bi_idx]) |
| |
| #define bvec_iter_page(bvec, iter) \ |
| (__bvec_iter_bvec((bvec), (iter))->bv_page) |
| |
| #define bvec_iter_len(bvec, iter) \ |
| min((iter).bi_size, \ |
| __bvec_iter_bvec((bvec), (iter))->bv_len - (iter).bi_bvec_done) |
| |
| #define bvec_iter_offset(bvec, iter) \ |
| (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done) |
| |
| #define bvec_iter_bvec(bvec, iter) \ |
| ((struct bio_vec) { \ |
| .bv_page = bvec_iter_page((bvec), (iter)), \ |
| .bv_len = bvec_iter_len((bvec), (iter)), \ |
| .bv_offset = bvec_iter_offset((bvec), (iter)), \ |
| }) |
| |
| #define bio_iter_iovec(bio, iter) \ |
| bvec_iter_bvec((bio)->bi_io_vec, (iter)) |
| |
| #define bio_iter_page(bio, iter) \ |
| bvec_iter_page((bio)->bi_io_vec, (iter)) |
| #define bio_iter_len(bio, iter) \ |
| bvec_iter_len((bio)->bi_io_vec, (iter)) |
| #define bio_iter_offset(bio, iter) \ |
| bvec_iter_offset((bio)->bi_io_vec, (iter)) |
| |
| #define bio_page(bio) bio_iter_page((bio), (bio)->bi_iter) |
| #define bio_offset(bio) bio_iter_offset((bio), (bio)->bi_iter) |
| #define bio_iovec(bio) bio_iter_iovec((bio), (bio)->bi_iter) |
| |
| #define bio_multiple_segments(bio) \ |
| ((bio)->bi_iter.bi_size != bio_iovec(bio).bv_len) |
| #define bio_sectors(bio) ((bio)->bi_iter.bi_size >> 9) |
| #define bio_end_sector(bio) ((bio)->bi_iter.bi_sector + bio_sectors((bio))) |
| |
| /* |
| * Check whether this bio carries any data or not. A NULL bio is allowed. |
| */ |
| static inline bool bio_has_data(struct bio *bio) |
| { |
| if (bio && |
| bio->bi_iter.bi_size && |
| !(bio->bi_rw & REQ_DISCARD)) |
| return true; |
| |
| return false; |
| } |
| |
| static inline bool bio_is_rw(struct bio *bio) |
| { |
| if (!bio_has_data(bio)) |
| return false; |
| |
| if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK) |
| return false; |
| |
| return true; |
| } |
| |
| static inline bool bio_mergeable(struct bio *bio) |
| { |
| if (bio->bi_rw & REQ_NOMERGE_FLAGS) |
| return false; |
| |
| return true; |
| } |
| |
| static inline unsigned int bio_cur_bytes(struct bio *bio) |
| { |
| if (bio_has_data(bio)) |
| return bio_iovec(bio).bv_len; |
| else /* dataless requests such as discard */ |
| return bio->bi_iter.bi_size; |
| } |
| |
| static inline void *bio_data(struct bio *bio) |
| { |
| if (bio_has_data(bio)) |
| return page_address(bio_page(bio)) + bio_offset(bio); |
| |
| return NULL; |
| } |
| |
| /* |
| * will die |
| */ |
| #define bio_to_phys(bio) (page_to_phys(bio_page((bio))) + (unsigned long) bio_offset((bio))) |
| #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) |
| |
| /* |
| * queues that have highmem support enabled may still need to revert to |
| * PIO transfers occasionally and thus map high pages temporarily. For |
| * permanent PIO fall back, user is probably better off disabling highmem |
| * I/O completely on that queue (see ide-dma for example) |
| */ |
| #define __bio_kmap_atomic(bio, iter) \ |
| (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ |
| bio_iter_iovec((bio), (iter)).bv_offset) |
| |
| #define __bio_kunmap_atomic(addr) kunmap_atomic(addr) |
| |
| /* |
| * merge helpers etc |
| */ |
| |
| /* Default implementation of BIOVEC_PHYS_MERGEABLE */ |
| #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ |
| ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) |
| |
| /* |
| * allow arch override, for eg virtualized architectures (put in asm/io.h) |
| */ |
| #ifndef BIOVEC_PHYS_MERGEABLE |
| #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ |
| __BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
| #endif |
| |
| #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ |
| (((addr1) | (mask)) == (((addr2) - 1) | (mask))) |
| #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ |
| __BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
| |
| /* |
| * 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_all(bvl, bio, i) \ |
| for (i = 0, bvl = (bio)->bi_io_vec; i < (bio)->bi_vcnt; i++, bvl++) |
| |
| static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter, |
| unsigned bytes) |
| { |
| WARN_ONCE(bytes > iter->bi_size, |
| "Attempted to advance past end of bvec iter\n"); |
| |
| while (bytes) { |
| unsigned len = min(bytes, bvec_iter_len(bv, *iter)); |
| |
| bytes -= len; |
| iter->bi_size -= len; |
| iter->bi_bvec_done += len; |
| |
| if (iter->bi_bvec_done == __bvec_iter_bvec(bv, *iter)->bv_len) { |
| iter->bi_bvec_done = 0; |
| iter->bi_idx++; |
| } |
| } |
| } |
| |
| #define for_each_bvec(bvl, bio_vec, iter, start) \ |
| for (iter = (start); \ |
| (iter).bi_size && \ |
| ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \ |
| bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len)) |
| |
| |
| static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter, |
| unsigned bytes) |
| { |
| iter->bi_sector += bytes >> 9; |
| |
| if (bio->bi_rw & BIO_NO_ADVANCE_ITER_MASK) |
| iter->bi_size -= bytes; |
| else |
| bvec_iter_advance(bio->bi_io_vec, iter, bytes); |
| } |
| |
| #define __bio_for_each_segment(bvl, bio, iter, start) \ |
| for (iter = (start); \ |
| (iter).bi_size && \ |
| ((bvl = bio_iter_iovec((bio), (iter))), 1); \ |
| bio_advance_iter((bio), &(iter), (bvl).bv_len)) |
| |
| #define bio_for_each_segment(bvl, bio, iter) \ |
| __bio_for_each_segment(bvl, bio, iter, (bio)->bi_iter) |
| |
| #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len) |
| |
| static inline unsigned bio_segments(struct bio *bio) |
| { |
| unsigned segs = 0; |
| struct bio_vec bv; |
| struct bvec_iter iter; |
| |
| /* |
| * We special case discard/write same, because they interpret bi_size |
| * differently: |
| */ |
| |
| if (bio->bi_rw & REQ_DISCARD) |
| return 1; |
| |
| if (bio->bi_rw & REQ_WRITE_SAME) |
| return 1; |
| |
| bio_for_each_segment(bv, bio, iter) |
| segs++; |
| |
| return segs; |
| } |
| |
| /* |
| * get a reference to a bio, so it won't disappear. the intended use is |
| * something like: |
| * |
| * bio_get(bio); |
| * submit_bio(rw, bio); |
| * if (bio->bi_flags ...) |
| * do_something |
| * bio_put(bio); |
| * |
| * without the bio_get(), it could potentially complete I/O before submit_bio |
| * returns. and then bio would be freed memory when if (bio->bi_flags ...) |
| * runs |
| */ |
| static inline void bio_get(struct bio *bio) |
| { |
| bio->bi_flags |= (1 << BIO_REFFED); |
| smp_mb__before_atomic(); |
| atomic_inc(&bio->__bi_cnt); |
| } |
| |
| static inline void bio_cnt_set(struct bio *bio, unsigned int count) |
| { |
| if (count != 1) { |
| bio->bi_flags |= (1 << BIO_REFFED); |
| smp_mb__before_atomic(); |
| } |
| atomic_set(&bio->__bi_cnt, count); |
| } |
| |
| static inline bool bio_flagged(struct bio *bio, unsigned int bit) |
| { |
| return (bio->bi_flags & (1U << bit)) != 0; |
| } |
| |
| static inline void bio_set_flag(struct bio *bio, unsigned int bit) |
| { |
| bio->bi_flags |= (1U << bit); |
| } |
| |
| static inline void bio_clear_flag(struct bio *bio, unsigned int bit) |
| { |
| bio->bi_flags &= ~(1U << bit); |
| } |
| |
| static inline void bio_get_first_bvec(struct bio *bio, struct bio_vec *bv) |
| { |
| *bv = bio_iovec(bio); |
| } |
| |
| static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv) |
| { |
| struct bvec_iter iter = bio->bi_iter; |
| int idx; |
| |
| if (unlikely(!bio_multiple_segments(bio))) { |
| *bv = bio_iovec(bio); |
| return; |
| } |
| |
| bio_advance_iter(bio, &iter, iter.bi_size); |
| |
| if (!iter.bi_bvec_done) |
| idx = iter.bi_idx - 1; |
| else /* in the middle of bvec */ |
| idx = iter.bi_idx; |
| |
| *bv = bio->bi_io_vec[idx]; |
| |
| /* |
| * iter.bi_bvec_done records actual length of the last bvec |
| * if this bio ends in the middle of one io vector |
| */ |
| if (iter.bi_bvec_done) |
| bv->bv_len = iter.bi_bvec_done; |
| } |
| |
| enum bip_flags { |
| BIP_BLOCK_INTEGRITY = 1 << 0, /* block layer owns integrity data */ |
| BIP_MAPPED_INTEGRITY = 1 << 1, /* ref tag has been remapped */ |
| BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ |
| BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ |
| BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ |
| }; |
| |
| /* |
| * bio integrity payload |
| */ |
| struct bio_integrity_payload { |
| struct bio *bip_bio; /* parent bio */ |
| |
| struct bvec_iter bip_iter; |
| |
| bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
| |
| unsigned short bip_slab; /* slab the bip came from */ |
| unsigned short bip_vcnt; /* # of integrity bio_vecs */ |
| unsigned short bip_max_vcnt; /* integrity bio_vec slots */ |
| unsigned short bip_flags; /* control flags */ |
| |
| struct work_struct bip_work; /* I/O completion */ |
| |
| struct bio_vec *bip_vec; |
| struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ |
| }; |
| |
| #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| |
| static inline struct bio_integrity_payload *bio_integrity(struct bio *bio) |
| { |
| if (bio->bi_rw & REQ_INTEGRITY) |
| return bio->bi_integrity; |
| |
| return NULL; |
| } |
| |
| static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
| { |
| struct bio_integrity_payload *bip = bio_integrity(bio); |
| |
| if (bip) |
| return bip->bip_flags & flag; |
| |
| return false; |
| } |
| |
| static inline sector_t bip_get_seed(struct bio_integrity_payload *bip) |
| { |
| return bip->bip_iter.bi_sector; |
| } |
| |
| static inline void bip_set_seed(struct bio_integrity_payload *bip, |
| sector_t seed) |
| { |
| bip->bip_iter.bi_sector = seed; |
| } |
| |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| extern void bio_trim(struct bio *bio, int offset, int size); |
| extern struct bio *bio_split(struct bio *bio, int sectors, |
| gfp_t gfp, struct bio_set *bs); |
| |
| /** |
| * bio_next_split - get next @sectors from a bio, splitting if necessary |
| * @bio: bio to split |
| * @sectors: number of sectors to split from the front of @bio |
| * @gfp: gfp mask |
| * @bs: bio set to allocate from |
| * |
| * Returns a bio representing the next @sectors of @bio - if the bio is smaller |
| * than @sectors, returns the original bio unchanged. |
| */ |
| static inline struct bio *bio_next_split(struct bio *bio, int sectors, |
| gfp_t gfp, struct bio_set *bs) |
| { |
| if (sectors >= bio_sectors(bio)) |
| return bio; |
| |
| return bio_split(bio, sectors, gfp, bs); |
| } |
| |
| extern struct bio_set *bioset_create(unsigned int, unsigned int); |
| extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int); |
| extern void bioset_free(struct bio_set *); |
| extern mempool_t *biovec_create_pool(int pool_entries); |
| |
| extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
| extern void bio_put(struct bio *); |
| |
| extern void __bio_clone_fast(struct bio *, struct bio *); |
| extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *); |
| extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs); |
| |
| extern struct bio_set *fs_bio_set; |
| |
| static inline struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
| { |
| return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); |
| } |
| |
| static inline struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
| { |
| return bio_clone_bioset(bio, gfp_mask, fs_bio_set); |
| } |
| |
| static inline struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs) |
| { |
| return bio_alloc_bioset(gfp_mask, nr_iovecs, NULL); |
| } |
| |
| static inline struct bio *bio_clone_kmalloc(struct bio *bio, gfp_t gfp_mask) |
| { |
| return bio_clone_bioset(bio, gfp_mask, NULL); |
| |
| } |
| |
| extern void bio_endio(struct bio *); |
| |
| static inline void bio_io_error(struct bio *bio) |
| { |
| bio->bi_error = -EIO; |
| bio_endio(bio); |
| } |
| |
| struct request_queue; |
| extern int bio_phys_segments(struct request_queue *, struct bio *); |
| |
| extern int submit_bio_wait(int rw, struct bio *bio); |
| extern void bio_advance(struct bio *, unsigned); |
| |
| extern void bio_init(struct bio *); |
| extern void bio_reset(struct bio *); |
| void bio_chain(struct bio *, struct bio *); |
| |
| extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); |
| extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |
| unsigned int, unsigned int); |
| struct rq_map_data; |
| extern struct bio *bio_map_user_iov(struct request_queue *, |
| const struct iov_iter *, gfp_t); |
| extern void bio_unmap_user(struct bio *); |
| extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
| gfp_t); |
| extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, |
| gfp_t, int); |
| extern void bio_set_pages_dirty(struct bio *bio); |
| extern void bio_check_pages_dirty(struct bio *bio); |
| |
| void generic_start_io_acct(int rw, unsigned long sectors, |
| struct hd_struct *part); |
| void generic_end_io_acct(int rw, struct hd_struct *part, |
| unsigned long start_time); |
| |
| #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
| #endif |
| #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| extern void bio_flush_dcache_pages(struct bio *bi); |
| #else |
| 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 struct bio *bio_copy_user_iov(struct request_queue *, |
| struct rq_map_data *, |
| const struct iov_iter *, |
| gfp_t); |
| extern int bio_uncopy_user(struct bio *); |
| void zero_fill_bio(struct bio *bio); |
| extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *); |
| extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int); |
| extern unsigned int bvec_nr_vecs(unsigned short idx); |
| |
| #ifdef CONFIG_BLK_CGROUP |
| int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); |
| int bio_associate_current(struct bio *bio); |
| void bio_disassociate_task(struct bio *bio); |
| #else /* CONFIG_BLK_CGROUP */ |
| static inline int bio_associate_blkcg(struct bio *bio, |
| struct cgroup_subsys_state *blkcg_css) { return 0; } |
| static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } |
| static inline void bio_disassociate_task(struct bio *bio) { } |
| #endif /* CONFIG_BLK_CGROUP */ |
| |
| #ifdef CONFIG_HIGHMEM |
| /* |
| * remember never ever reenable interrupts between a bvec_kmap_irq and |
| * bvec_kunmap_irq! |
| */ |
| static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
| { |
| unsigned long addr; |
| |
| /* |
| * might not be a highmem page, but the preempt/irq count |
| * balancing is a lot nicer this way |
| */ |
| local_irq_save(*flags); |
| addr = (unsigned long) kmap_atomic(bvec->bv_page); |
| |
| BUG_ON(addr & ~PAGE_MASK); |
| |
| return (char *) addr + bvec->bv_offset; |
| } |
| |
| static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
| { |
| unsigned long ptr = (unsigned long) buffer & PAGE_MASK; |
| |
| kunmap_atomic((void *) ptr); |
| local_irq_restore(*flags); |
| } |
| |
| #else |
| static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
| { |
| return page_address(bvec->bv_page) + bvec->bv_offset; |
| } |
| |
| static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
| { |
| *flags = 0; |
| } |
| #endif |
| |
| static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, |
| unsigned long *flags) |
| { |
| return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); |
| } |
| #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) |
| |
| #define bio_kmap_irq(bio, flags) \ |
| __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) |
| #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
| |
| /* |
| * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
| * |
| * A bio_list anchors a singly-linked list of bios chained through the bi_next |
| * member of the bio. The bio_list also caches the last list member to allow |
| * fast access to the tail. |
| */ |
| struct bio_list { |
| struct bio *head; |
| struct bio *tail; |
| }; |
| |
| static inline int bio_list_empty(const struct bio_list *bl) |
| { |
| return bl->head == NULL; |
| } |
| |
| static inline void bio_list_init(struct bio_list *bl) |
| { |
| bl->head = bl->tail = NULL; |
| } |
| |
| #define BIO_EMPTY_LIST { NULL, NULL } |
| |
| #define bio_list_for_each(bio, bl) \ |
| for (bio = (bl)->head; bio; bio = bio->bi_next) |
| |
| static inline unsigned bio_list_size(const struct bio_list *bl) |
| { |
| unsigned sz = 0; |
| struct bio *bio; |
| |
| bio_list_for_each(bio, bl) |
| sz++; |
| |
| return sz; |
| } |
| |
| static inline void bio_list_add(struct bio_list *bl, struct bio *bio) |
| { |
| bio->bi_next = NULL; |
| |
| if (bl->tail) |
| bl->tail->bi_next = bio; |
| else |
| bl->head = bio; |
| |
| bl->tail = bio; |
| } |
| |
| static inline void bio_list_add_head(struct bio_list *bl, struct bio *bio) |
| { |
| bio->bi_next = bl->head; |
| |
| bl->head = bio; |
| |
| if (!bl->tail) |
| bl->tail = bio; |
| } |
| |
| static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2) |
| { |
| if (!bl2->head) |
| return; |
| |
| if (bl->tail) |
| bl->tail->bi_next = bl2->head; |
| else |
| bl->head = bl2->head; |
| |
| bl->tail = bl2->tail; |
| } |
| |
| static inline void bio_list_merge_head(struct bio_list *bl, |
| struct bio_list *bl2) |
| { |
| if (!bl2->head) |
| return; |
| |
| if (bl->head) |
| bl2->tail->bi_next = bl->head; |
| else |
| bl->tail = bl2->tail; |
| |
| bl->head = bl2->head; |
| } |
| |
| static inline struct bio *bio_list_peek(struct bio_list *bl) |
| { |
| return bl->head; |
| } |
| |
| static inline struct bio *bio_list_pop(struct bio_list *bl) |
| { |
| struct bio *bio = bl->head; |
| |
| if (bio) { |
| bl->head = bl->head->bi_next; |
| if (!bl->head) |
| bl->tail = NULL; |
| |
| bio->bi_next = NULL; |
| } |
| |
| return bio; |
| } |
| |
| static inline struct bio *bio_list_get(struct bio_list *bl) |
| { |
| struct bio *bio = bl->head; |
| |
| bl->head = bl->tail = NULL; |
| |
| return bio; |
| } |
| |
| /* |
| * 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[]. |
| */ |
| #define BIO_POOL_SIZE 2 |
| #define BIOVEC_NR_POOLS 6 |
| #define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) |
| |
| struct bio_set { |
| struct kmem_cache *bio_slab; |
| unsigned int front_pad; |
| |
| mempool_t *bio_pool; |
| mempool_t *bvec_pool; |
| #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| mempool_t *bio_integrity_pool; |
| mempool_t *bvec_integrity_pool; |
| #endif |
| |
| /* |
| * Deadlock avoidance for stacking block drivers: see comments in |
| * bio_alloc_bioset() for details |
| */ |
| spinlock_t rescue_lock; |
| struct bio_list rescue_list; |
| struct work_struct rescue_work; |
| struct workqueue_struct *rescue_workqueue; |
| }; |
| |
| struct biovec_slab { |
| int nr_vecs; |
| char *name; |
| struct kmem_cache *slab; |
| }; |
| |
| /* |
| * a small number of entries is fine, not going to be performance critical. |
| * basically we just need to survive |
| */ |
| #define BIO_SPLIT_ENTRIES 2 |
| |
| #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| |
| #define bip_for_each_vec(bvl, bip, iter) \ |
| for_each_bvec(bvl, (bip)->bip_vec, iter, (bip)->bip_iter) |
| |
| #define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ |
| for_each_bio(_bio) \ |
| bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) |
| |
| extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
| extern void bio_integrity_free(struct bio *); |
| extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); |
| extern bool bio_integrity_enabled(struct bio *bio); |
| extern int bio_integrity_prep(struct bio *); |
| extern void bio_integrity_endio(struct bio *); |
| extern void bio_integrity_advance(struct bio *, unsigned int); |
| extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); |
| extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); |
| extern int bioset_integrity_create(struct bio_set *, int); |
| extern void bioset_integrity_free(struct bio_set *); |
| extern void bio_integrity_init(void); |
| |
| #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| static inline void *bio_integrity(struct bio *bio) |
| { |
| return NULL; |
| } |
| |
| static inline bool bio_integrity_enabled(struct bio *bio) |
| { |
| return false; |
| } |
| |
| static inline int bioset_integrity_create(struct bio_set *bs, int pool_size) |
| { |
| return 0; |
| } |
| |
| static inline void bioset_integrity_free (struct bio_set *bs) |
| { |
| return; |
| } |
| |
| static inline int bio_integrity_prep(struct bio *bio) |
| { |
| return 0; |
| } |
| |
| static inline void bio_integrity_free(struct bio *bio) |
| { |
| return; |
| } |
| |
| static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
| gfp_t gfp_mask) |
| { |
| return 0; |
| } |
| |
| static inline void bio_integrity_advance(struct bio *bio, |
| unsigned int bytes_done) |
| { |
| return; |
| } |
| |
| static inline void bio_integrity_trim(struct bio *bio, unsigned int offset, |
| unsigned int sectors) |
| { |
| return; |
| } |
| |
| static inline void bio_integrity_init(void) |
| { |
| return; |
| } |
| |
| static inline bool bio_integrity_flagged(struct bio *bio, enum bip_flags flag) |
| { |
| return false; |
| } |
| |
| static inline void *bio_integrity_alloc(struct bio * bio, gfp_t gfp, |
| unsigned int nr) |
| { |
| return ERR_PTR(-EINVAL); |
| } |
| |
| static inline int bio_integrity_add_page(struct bio *bio, struct page *page, |
| unsigned int len, unsigned int offset) |
| { |
| return 0; |
| } |
| |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| #endif /* CONFIG_BLOCK */ |
| #endif /* __LINUX_BIO_H */ |