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include/linux/bio.h
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/* * 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 |
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* 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> |
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#include <linux/ioprio.h> |
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#ifdef CONFIG_BLOCK |
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#include <asm/io.h> |
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/* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */ #include <linux/blk_types.h> |
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#define BIO_DEBUG #ifdef BIO_DEBUG #define BIO_BUG_ON BUG_ON #else #define BIO_BUG_ON #endif |
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#define BIO_MAX_PAGES 256 |
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#define BIO_MAX_SIZE (BIO_MAX_PAGES << PAGE_CACHE_SHIFT) #define BIO_MAX_SECTORS (BIO_MAX_SIZE >> 9) /* |
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* 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) /* |
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* various member access, note that bio_data should of course not be used * on highmem page vectors */ #define bio_iovec_idx(bio, idx) (&((bio)->bi_io_vec[(idx)])) #define bio_iovec(bio) bio_iovec_idx((bio), (bio)->bi_idx) #define bio_page(bio) bio_iovec((bio))->bv_page #define bio_offset(bio) bio_iovec((bio))->bv_offset #define bio_segments(bio) ((bio)->bi_vcnt - (bio)->bi_idx) #define bio_sectors(bio) ((bio)->bi_size >> 9) |
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static inline unsigned int bio_cur_bytes(struct bio *bio) |
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{ if (bio->bi_vcnt) |
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return bio_iovec(bio)->bv_len; |
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else /* dataless requests such as discard */ |
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return bio->bi_size; |
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} static inline void *bio_data(struct bio *bio) { if (bio->bi_vcnt) return page_address(bio_page(bio)) + bio_offset(bio); return NULL; } |
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static inline int bio_has_allocated_vec(struct bio *bio) { return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs; } |
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/* * 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, idx, kmtype) \ (kmap_atomic(bio_iovec_idx((bio), (idx))->bv_page, kmtype) + \ bio_iovec_idx((bio), (idx))->bv_offset) #define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr, kmtype) /* * merge helpers etc */ #define __BVEC_END(bio) bio_iovec_idx((bio), (bio)->bi_vcnt - 1) #define __BVEC_START(bio) bio_iovec_idx((bio), (bio)->bi_idx) |
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/* Default implementation of BIOVEC_PHYS_MERGEABLE */ #define __BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) |
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/* * allow arch override, for eg virtualized architectures (put in asm/io.h) */ #ifndef BIOVEC_PHYS_MERGEABLE #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ |
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__BIOVEC_PHYS_MERGEABLE(vec1, vec2) |
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#endif |
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#define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \ (((addr1) | (mask)) == (((addr2) - 1) | (mask))) #define BIOVEC_SEG_BOUNDARY(q, b1, b2) \ |
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__BIO_SEG_BOUNDARY(bvec_to_phys((b1)), bvec_to_phys((b2)) + (b2)->bv_len, queue_segment_boundary((q))) |
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#define BIO_SEG_BOUNDARY(q, b1, b2) \ BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2))) |
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#define bio_io_error(bio) bio_endio((bio), -EIO) |
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/* * drivers should not use the __ version unless they _really_ want to * run through the entire bio and not just pending pieces */ #define __bio_for_each_segment(bvl, bio, i, start_idx) \ for (bvl = bio_iovec_idx((bio), (start_idx)), i = (start_idx); \ i < (bio)->bi_vcnt; \ bvl++, i++) #define bio_for_each_segment(bvl, bio, i) \ __bio_for_each_segment(bvl, bio, i, (bio)->bi_idx) /* * 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 */ #define bio_get(bio) atomic_inc(&(bio)->bi_cnt) |
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#if defined(CONFIG_BLK_DEV_INTEGRITY) /* * bio integrity payload */ struct bio_integrity_payload { struct bio *bip_bio; /* parent bio */ |
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sector_t bip_sector; /* virtual start sector */ void *bip_buf; /* generated integrity data */ bio_end_io_t *bip_end_io; /* saved I/O completion fn */ |
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unsigned int bip_size; |
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unsigned short bip_slab; /* slab the bip came from */ |
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unsigned short bip_vcnt; /* # of integrity bio_vecs */ unsigned short bip_idx; /* current bip_vec index */ struct work_struct bip_work; /* I/O completion */ |
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struct bio_vec bip_vec[0]; /* embedded bvec array */ |
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}; #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
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/* * A bio_pair is used when we need to split a bio. * This can only happen for a bio that refers to just one * page of data, and in the unusual situation when the * page crosses a chunk/device boundary * * The address of the master bio is stored in bio1.bi_private * The address of the pool the pair was allocated from is stored * in bio2.bi_private */ struct bio_pair { |
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struct bio bio1, bio2; struct bio_vec bv1, bv2; #if defined(CONFIG_BLK_DEV_INTEGRITY) struct bio_integrity_payload bip1, bip2; struct bio_vec iv1, iv2; #endif atomic_t cnt; int error; |
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}; |
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extern struct bio_pair *bio_split(struct bio *bi, int first_sectors); |
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extern void bio_pair_release(struct bio_pair *dbio); |
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extern struct bio_set *bioset_create(unsigned int, unsigned int); |
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extern void bioset_free(struct bio_set *); |
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extern struct bio *bio_alloc(gfp_t, unsigned int); extern struct bio *bio_kmalloc(gfp_t, unsigned int); |
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extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); |
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extern void bio_put(struct bio *); |
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extern void bio_free(struct bio *, struct bio_set *); |
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extern void bio_endio(struct bio *, int); |
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struct request_queue; extern int bio_phys_segments(struct request_queue *, struct bio *); |
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extern void __bio_clone(struct bio *, struct bio *); |
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extern struct bio *bio_clone(struct bio *, gfp_t); |
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extern void bio_init(struct bio *); extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); |
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extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, unsigned int, unsigned int); |
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extern int bio_get_nr_vecs(struct block_device *); |
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extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int); |
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extern struct bio *bio_map_user(struct request_queue *, struct block_device *, |
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unsigned long, unsigned int, int, gfp_t); |
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struct sg_iovec; |
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struct rq_map_data; |
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extern struct bio *bio_map_user_iov(struct request_queue *, struct block_device *, |
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struct sg_iovec *, int, int, gfp_t); |
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extern void bio_unmap_user(struct bio *); |
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extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int, |
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gfp_t); |
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extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int, gfp_t, int); |
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extern void bio_set_pages_dirty(struct bio *bio); extern void bio_check_pages_dirty(struct bio *bio); |
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#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 |
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extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *, unsigned long, unsigned int, int, gfp_t); extern struct bio *bio_copy_user_iov(struct request_queue *, struct rq_map_data *, struct sg_iovec *, |
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int, int, gfp_t); |
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extern int bio_uncopy_user(struct bio *); void zero_fill_bio(struct bio *bio); |
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extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *); |
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extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int); |
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extern unsigned int bvec_nr_vecs(unsigned short idx); |
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/* * 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 |
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#define BIOVEC_MAX_IDX (BIOVEC_NR_POOLS - 1) |
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struct bio_set { |
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struct kmem_cache *bio_slab; |
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unsigned int front_pad; |
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mempool_t *bio_pool; |
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#if defined(CONFIG_BLK_DEV_INTEGRITY) mempool_t *bio_integrity_pool; #endif |
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mempool_t *bvec_pool; |
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}; struct biovec_slab { int nr_vecs; char *name; struct kmem_cache *slab; }; extern struct bio_set *fs_bio_set; /* * a small number of entries is fine, not going to be performance critical. * basically we just need to survive */ #define BIO_SPLIT_ENTRIES 2 |
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#ifdef CONFIG_HIGHMEM /* |
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* remember never ever reenable interrupts between a bvec_kmap_irq and * bvec_kunmap_irq! |
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*/ |
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static inline char *bvec_kmap_irq(struct bio_vec *bvec, unsigned long *flags) |
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{ 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, KM_BIO_SRC_IRQ); BUG_ON(addr & ~PAGE_MASK); return (char *) addr + bvec->bv_offset; } |
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static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) |
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{ unsigned long ptr = (unsigned long) buffer & PAGE_MASK; kunmap_atomic((void *) ptr, KM_BIO_SRC_IRQ); local_irq_restore(*flags); } #else |
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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; } |
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#endif |
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static inline char *__bio_kmap_irq(struct bio *bio, unsigned short idx, |
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unsigned long *flags) { return bvec_kmap_irq(bio_iovec_idx(bio, idx), flags); } #define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) #define bio_kmap_irq(bio, flags) \ __bio_kmap_irq((bio), (bio)->bi_idx, (flags)) #define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) |
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/* * Check whether this bio carries any data or not. A NULL bio is allowed. */ static inline int bio_has_data(struct bio *bio) { return bio && bio->bi_io_vec != NULL; } |
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/* |
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* BIO list management for use by remapping drivers (e.g. DM or MD) and loop. |
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* * 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_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; } |
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static inline struct bio *bio_list_peek(struct bio_list *bl) { return bl->head; } |
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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; } |
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#if defined(CONFIG_BLK_DEV_INTEGRITY) #define bip_vec_idx(bip, idx) (&(bip->bip_vec[(idx)])) #define bip_vec(bip) bip_vec_idx(bip, 0) #define __bip_for_each_vec(bvl, bip, i, start_idx) \ for (bvl = bip_vec_idx((bip), (start_idx)), i = (start_idx); \ i < (bip)->bip_vcnt; \ bvl++, i++) #define bip_for_each_vec(bvl, bip, i) \ __bip_for_each_vec(bvl, bip, i, (bip)->bip_idx) |
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#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ for_each_bio(_bio) \ bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) |
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#define bio_integrity(bio) (bio->bi_integrity != NULL) |
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extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *); |
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extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); |
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extern void bio_integrity_free(struct bio *, struct bio_set *); |
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extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); extern int bio_integrity_enabled(struct bio *bio); extern int bio_integrity_set_tag(struct bio *, void *, unsigned int); extern int bio_integrity_get_tag(struct bio *, void *, unsigned int); extern int bio_integrity_prep(struct bio *); extern void bio_integrity_endio(struct bio *, int); extern void bio_integrity_advance(struct bio *, unsigned int); extern void bio_integrity_trim(struct bio *, unsigned int, unsigned int); extern void bio_integrity_split(struct bio *, struct bio_pair *, int); |
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extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t, struct bio_set *); extern int bioset_integrity_create(struct bio_set *, int); extern void bioset_integrity_free(struct bio_set *); extern void bio_integrity_init(void); |
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#else /* CONFIG_BLK_DEV_INTEGRITY */ #define bio_integrity(a) (0) |
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#define bioset_integrity_create(a, b) (0) |
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#define bio_integrity_prep(a) (0) #define bio_integrity_enabled(a) (0) |
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static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp_mask, struct bio_set *bs) { return 0; } |
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#define bioset_integrity_free(a) do { } while (0) #define bio_integrity_free(a, b) do { } while (0) |
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#define bio_integrity_endio(a, b) do { } while (0) #define bio_integrity_advance(a, b) do { } while (0) #define bio_integrity_trim(a, b, c) do { } while (0) #define bio_integrity_split(a, b, c) do { } while (0) #define bio_integrity_set_tag(a, b, c) do { } while (0) #define bio_integrity_get_tag(a, b, c) do { } while (0) |
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#define bio_integrity_init(a) do { } while (0) |
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#endif /* CONFIG_BLK_DEV_INTEGRITY */ |
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#endif /* CONFIG_BLOCK */ |
1da177e4c Linux-2.6.12-rc2 |
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#endif /* __LINUX_BIO_H */ |