diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/bio.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/bio.h | 581 |
1 files changed, 0 insertions, 581 deletions
diff --git a/ANDROID_3.4.5/include/linux/bio.h b/ANDROID_3.4.5/include/linux/bio.h deleted file mode 100644 index 4d94eb8b..00000000 --- a/ANDROID_3.4.5/include/linux/bio.h +++ /dev/null @@ -1,581 +0,0 @@ -/* - * 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 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) - -static inline unsigned int bio_cur_bytes(struct bio *bio) -{ - if (bio->bi_vcnt) - return bio_iovec(bio)->bv_len; - else /* dataless requests such as discard */ - return bio->bi_size; -} - -static inline void *bio_data(struct bio *bio) -{ - if (bio->bi_vcnt) - return page_address(bio_page(bio)) + bio_offset(bio); - - return NULL; -} - -static inline int bio_has_allocated_vec(struct bio *bio) -{ - return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs; -} - -/* - * 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) + \ - bio_iovec_idx((bio), (idx))->bv_offset) - -#define __bio_kunmap_atomic(addr, kmtype) kunmap_atomic(addr) - -/* - * 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) - -/* 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))) -#define BIO_SEG_BOUNDARY(q, b1, b2) \ - BIOVEC_SEG_BOUNDARY((q), __BVEC_END((b1)), __BVEC_START((b2))) - -#define bio_io_error(bio) bio_endio((bio), -EIO) - -/* - * 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) - -#if defined(CONFIG_BLK_DEV_INTEGRITY) -/* - * bio integrity payload - */ -struct bio_integrity_payload { - struct bio *bip_bio; /* parent bio */ - - 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 */ - - unsigned int bip_size; - - unsigned short bip_slab; /* slab the bip came from */ - unsigned short bip_vcnt; /* # of integrity bio_vecs */ - unsigned short bip_idx; /* current bip_vec index */ - - struct work_struct bip_work; /* I/O completion */ - struct bio_vec bip_vec[0]; /* embedded bvec array */ -}; -#endif /* CONFIG_BLK_DEV_INTEGRITY */ - -/* - * 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 { - 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; -}; -extern struct bio_pair *bio_split(struct bio *bi, int first_sectors); -extern void bio_pair_release(struct bio_pair *dbio); - -extern struct bio_set *bioset_create(unsigned int, unsigned int); -extern void bioset_free(struct bio_set *); - -extern struct bio *bio_alloc(gfp_t, unsigned int); -extern struct bio *bio_kmalloc(gfp_t, unsigned int); -extern struct bio *bio_alloc_bioset(gfp_t, int, struct bio_set *); -extern void bio_put(struct bio *); -extern void bio_free(struct bio *, struct bio_set *); - -extern void bio_endio(struct bio *, int); -struct request_queue; -extern int bio_phys_segments(struct request_queue *, struct bio *); - -extern void __bio_clone(struct bio *, struct bio *); -extern struct bio *bio_clone(struct bio *, gfp_t); - -extern void bio_init(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); -extern int bio_get_nr_vecs(struct block_device *); -extern sector_t bio_sector_offset(struct bio *, unsigned short, unsigned int); -extern struct bio *bio_map_user(struct request_queue *, struct block_device *, - unsigned long, unsigned int, int, gfp_t); -struct sg_iovec; -struct rq_map_data; -extern struct bio *bio_map_user_iov(struct request_queue *, - struct block_device *, - struct sg_iovec *, int, int, 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); - -#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 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 *, - int, int, gfp_t); -extern int bio_uncopy_user(struct bio *); -void zero_fill_bio(struct bio *bio); -extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set *); -extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int); -extern unsigned int bvec_nr_vecs(unsigned short 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[]. - */ -#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; -#if defined(CONFIG_BLK_DEV_INTEGRITY) - mempool_t *bio_integrity_pool; -#endif - mempool_t *bvec_pool; -}; - -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 - -#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, unsigned short idx, - 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) - -/* - * 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; -} - -/* - * 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_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; -} - -#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) - -#define bio_for_each_integrity_vec(_bvl, _bio, _iter) \ - for_each_bio(_bio) \ - bip_for_each_vec(_bvl, _bio->bi_integrity, _iter) - -#define bio_integrity(bio) (bio->bi_integrity != NULL) - -extern struct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *, gfp_t, unsigned int, struct bio_set *); -extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, unsigned int); -extern void bio_integrity_free(struct bio *, struct bio_set *); -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); -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); - -#else /* CONFIG_BLK_DEV_INTEGRITY */ - -static inline int bio_integrity(struct bio *bio) -{ - return 0; -} - -static inline int bio_integrity_enabled(struct bio *bio) -{ - return 0; -} - -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, struct bio_set *bs) -{ - return; -} - -static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src, - gfp_t gfp_mask, struct bio_set *bs) -{ - return 0; -} - -static inline void bio_integrity_split(struct bio *bio, struct bio_pair *bp, - int sectors) -{ - return; -} - -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; -} - -#endif /* CONFIG_BLK_DEV_INTEGRITY */ - -#endif /* CONFIG_BLOCK */ -#endif /* __LINUX_BIO_H */ |