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fs/bio.c
39.2 KB
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/* |
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* Copyright (C) 2001 Jens Axboe <axboe@kernel.dk> |
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* * 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- * */ #include <linux/mm.h> #include <linux/swap.h> #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mempool.h> #include <linux/workqueue.h> |
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#include <scsi/sg.h> /* for struct sg_iovec */ |
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#include <trace/events/block.h> |
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/* * Test patch to inline a certain number of bi_io_vec's inside the bio * itself, to shrink a bio data allocation from two mempool calls to one */ #define BIO_INLINE_VECS 4 |
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static mempool_t *bio_split_pool __read_mostly; |
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/* * if you change this list, also change bvec_alloc or things will * break badly! cannot be bigger than what you can fit into an * unsigned short */ |
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#define BV(x) { .nr_vecs = x, .name = "biovec-"__stringify(x) } |
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struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly = { |
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BV(1), BV(4), BV(16), BV(64), BV(128), BV(BIO_MAX_PAGES), }; #undef BV /* |
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* fs_bio_set is the bio_set containing bio and iovec memory pools used by * IO code that does not need private memory pools. */ |
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struct bio_set *fs_bio_set; |
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/* * Our slab pool management */ 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; unsigned int i, entry = -1; mutex_lock(&bio_slab_lock); i = 0; while (i < bio_slab_nr) { |
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bslab = &bio_slabs[i]; |
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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) { bio_slab_max <<= 1; bio_slabs = krealloc(bio_slabs, bio_slab_max * sizeof(struct bio_slab), GFP_KERNEL); if (!bio_slabs) goto out_unlock; } 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, 0, SLAB_HWCACHE_ALIGN, NULL); if (!slab) goto out_unlock; printk("bio: create slab <%s> at %d ", bslab->name, entry); 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! ")) 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); } |
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unsigned int bvec_nr_vecs(unsigned short idx) { return bvec_slabs[idx].nr_vecs; } |
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void bvec_free_bs(struct bio_set *bs, struct bio_vec *bv, unsigned int idx) { BIO_BUG_ON(idx >= BIOVEC_NR_POOLS); if (idx == BIOVEC_MAX_IDX) mempool_free(bv, bs->bvec_pool); else { struct biovec_slab *bvs = bvec_slabs + idx; kmem_cache_free(bvs->slab, bv); } } |
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struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned long *idx, struct bio_set *bs) |
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{ struct bio_vec *bvl; |
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/* |
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* see comment near bvec_array define! */ 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; } /* * idx now points to the pool we want to allocate from. only the * 1-vec entry pool is mempool backed. */ if (*idx == BIOVEC_MAX_IDX) { fallback: bvl = mempool_alloc(bs->bvec_pool, gfp_mask); } else { struct biovec_slab *bvs = bvec_slabs + *idx; gfp_t __gfp_mask = gfp_mask & ~(__GFP_WAIT | __GFP_IO); |
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/* |
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* Make this allocation restricted and don't dump info on * allocation failures, since we'll fallback to the mempool * in case of failure. |
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*/ |
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__gfp_mask |= __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN; |
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|
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/* |
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* Try a slab allocation. If this fails and __GFP_WAIT * is set, retry with the 1-entry mempool |
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*/ |
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bvl = kmem_cache_alloc(bvs->slab, __gfp_mask); if (unlikely(!bvl && (gfp_mask & __GFP_WAIT))) { *idx = BIOVEC_MAX_IDX; goto fallback; } } |
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return bvl; } |
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void bio_free(struct bio *bio, struct bio_set *bs) |
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{ |
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void *p; |
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|
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if (bio_has_allocated_vec(bio)) |
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bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio)); |
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|
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if (bio_integrity(bio)) |
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bio_integrity_free(bio, bs); |
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|
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/* * If we have front padding, adjust the bio pointer before freeing */ p = bio; if (bs->front_pad) p -= bs->front_pad; mempool_free(p, bs->bio_pool); |
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} |
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EXPORT_SYMBOL(bio_free); |
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|
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void bio_init(struct bio *bio) |
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{ |
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memset(bio, 0, sizeof(*bio)); |
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bio->bi_flags = 1 << BIO_UPTODATE; |
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bio->bi_comp_cpu = -1; |
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atomic_set(&bio->bi_cnt, 1); |
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} |
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EXPORT_SYMBOL(bio_init); |
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/** * bio_alloc_bioset - allocate a bio for I/O * @gfp_mask: the GFP_ mask given to the slab allocator * @nr_iovecs: number of iovecs to pre-allocate |
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* @bs: the bio_set to allocate from. |
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* * Description: |
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* bio_alloc_bioset will try its own mempool to satisfy the allocation. |
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* If %__GFP_WAIT is set then we will block on the internal pool waiting |
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* for a &struct bio to become free. |
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* |
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* Note that the caller must set ->bi_destructor on successful return |
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* of a bio, to do the appropriate freeing of the bio once the reference * count drops to zero. |
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**/ |
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struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs) |
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{ |
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unsigned long idx = BIO_POOL_NONE; |
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struct bio_vec *bvl = NULL; |
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struct bio *bio; void *p; p = mempool_alloc(bs->bio_pool, gfp_mask); if (unlikely(!p)) return NULL; bio = p + bs->front_pad; |
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|
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bio_init(bio); if (unlikely(!nr_iovecs)) goto out_set; if (nr_iovecs <= BIO_INLINE_VECS) { bvl = bio->bi_inline_vecs; nr_iovecs = BIO_INLINE_VECS; } else { bvl = bvec_alloc_bs(gfp_mask, nr_iovecs, &idx, bs); if (unlikely(!bvl)) goto err_free; nr_iovecs = bvec_nr_vecs(idx); |
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} |
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out_set: |
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bio->bi_flags |= idx << BIO_POOL_OFFSET; bio->bi_max_vecs = nr_iovecs; |
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bio->bi_io_vec = bvl; |
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return bio; |
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err_free: |
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mempool_free(p, bs->bio_pool); |
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return NULL; |
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} |
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EXPORT_SYMBOL(bio_alloc_bioset); |
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static void bio_fs_destructor(struct bio *bio) { bio_free(bio, fs_bio_set); } /** * bio_alloc - allocate a new bio, memory pool backed * @gfp_mask: allocation mask to use * @nr_iovecs: number of iovecs * |
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* bio_alloc will allocate a bio and associated bio_vec array that can hold * at least @nr_iovecs entries. Allocations will be done from the * fs_bio_set. Also see @bio_alloc_bioset and @bio_kmalloc. * * If %__GFP_WAIT is set, then bio_alloc will always be able to allocate * a bio. This is due to the mempool guarantees. To make this work, callers * must never allocate more than 1 bio at a time from this pool. Callers * that need to allocate more than 1 bio must always submit the previously * allocated bio for IO before attempting to allocate a new one. Failure to * do so can cause livelocks under memory pressure. |
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* * RETURNS: * Pointer to new bio on success, NULL on failure. */ struct bio *bio_alloc(gfp_t gfp_mask, int nr_iovecs) { struct bio *bio = bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set); if (bio) bio->bi_destructor = bio_fs_destructor; return bio; } |
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EXPORT_SYMBOL(bio_alloc); |
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static void bio_kmalloc_destructor(struct bio *bio) { if (bio_integrity(bio)) |
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bio_integrity_free(bio, fs_bio_set); |
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kfree(bio); } |
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/** |
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* bio_kmalloc - allocate a bio for I/O using kmalloc() |
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* @gfp_mask: the GFP_ mask given to the slab allocator * @nr_iovecs: number of iovecs to pre-allocate * * Description: |
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* Allocate a new bio with @nr_iovecs bvecs. If @gfp_mask contains * %__GFP_WAIT, the allocation is guaranteed to succeed. |
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* **/ |
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struct bio *bio_kmalloc(gfp_t gfp_mask, int nr_iovecs) { |
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struct bio *bio; |
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|
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bio = kmalloc(sizeof(struct bio) + nr_iovecs * sizeof(struct bio_vec), gfp_mask); if (unlikely(!bio)) return NULL; bio_init(bio); bio->bi_flags |= BIO_POOL_NONE << BIO_POOL_OFFSET; bio->bi_max_vecs = nr_iovecs; bio->bi_io_vec = bio->bi_inline_vecs; bio->bi_destructor = bio_kmalloc_destructor; |
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return bio; } |
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EXPORT_SYMBOL(bio_kmalloc); |
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|
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void zero_fill_bio(struct bio *bio) { unsigned long flags; struct bio_vec *bv; int i; bio_for_each_segment(bv, bio, i) { 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); /** * bio_put - release a reference to a bio * @bio: bio to release reference to * * Description: * Put a reference to a &struct bio, either one you have gotten with |
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* bio_alloc, bio_get or bio_clone. The last put of a bio will free it. |
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**/ void bio_put(struct bio *bio) { BIO_BUG_ON(!atomic_read(&bio->bi_cnt)); /* * last put frees it */ if (atomic_dec_and_test(&bio->bi_cnt)) { bio->bi_next = NULL; bio->bi_destructor(bio); } } |
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EXPORT_SYMBOL(bio_put); |
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|
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inline int bio_phys_segments(struct request_queue *q, struct bio *bio) |
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{ if (unlikely(!bio_flagged(bio, BIO_SEG_VALID))) blk_recount_segments(q, bio); return bio->bi_phys_segments; } |
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EXPORT_SYMBOL(bio_phys_segments); |
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|
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/** * __bio_clone - clone a bio * @bio: destination bio * @bio_src: bio to clone * * Clone a &bio. Caller will own the returned bio, but not * the actual data it points to. Reference count of returned * bio will be one. */ |
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void __bio_clone(struct bio *bio, struct bio *bio_src) |
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{ |
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memcpy(bio->bi_io_vec, bio_src->bi_io_vec, bio_src->bi_max_vecs * sizeof(struct bio_vec)); |
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/* * most users will be overriding ->bi_bdev with a new target, * so we don't set nor calculate new physical/hw segment counts here */ |
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bio->bi_sector = bio_src->bi_sector; bio->bi_bdev = bio_src->bi_bdev; bio->bi_flags |= 1 << BIO_CLONED; bio->bi_rw = bio_src->bi_rw; |
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bio->bi_vcnt = bio_src->bi_vcnt; bio->bi_size = bio_src->bi_size; |
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bio->bi_idx = bio_src->bi_idx; |
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} |
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EXPORT_SYMBOL(__bio_clone); |
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/** * bio_clone - clone a bio * @bio: bio to clone * @gfp_mask: allocation priority * * Like __bio_clone, only also allocates the returned bio */ |
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struct bio *bio_clone(struct bio *bio, gfp_t gfp_mask) |
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{ struct bio *b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, fs_bio_set); |
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if (!b) return NULL; b->bi_destructor = bio_fs_destructor; __bio_clone(b, bio); if (bio_integrity(bio)) { int ret; |
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ret = bio_integrity_clone(b, bio, gfp_mask, fs_bio_set); |
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if (ret < 0) { bio_put(b); |
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return NULL; |
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} |
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} |
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return b; } |
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EXPORT_SYMBOL(bio_clone); |
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/** * bio_get_nr_vecs - return approx number of vecs * @bdev: I/O target * * Return the approximate number of pages we can send to this target. * There's no guarantee that you will be able to fit this number of pages * into a bio, it does not account for dynamic restrictions that vary * on offset. */ int bio_get_nr_vecs(struct block_device *bdev) { |
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struct request_queue *q = bdev_get_queue(bdev); |
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int nr_pages; |
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nr_pages = ((queue_max_sectors(q) << 9) + PAGE_SIZE - 1) >> PAGE_SHIFT; |
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if (nr_pages > queue_max_segments(q)) nr_pages = queue_max_segments(q); |
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return nr_pages; } |
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EXPORT_SYMBOL(bio_get_nr_vecs); |
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|
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static int __bio_add_page(struct request_queue *q, struct bio *bio, struct page |
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*page, unsigned int len, unsigned int offset, unsigned short max_sectors) |
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{ int retried_segments = 0; struct bio_vec *bvec; /* * cloned bio must not modify vec list */ if (unlikely(bio_flagged(bio, BIO_CLONED))) return 0; |
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if (((bio->bi_size + len) >> 9) > max_sectors) |
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return 0; |
80cfd548e [BLOCK] bio: chec... |
521 522 523 524 525 526 527 528 529 530 |
/* * For filesystems with a blocksize smaller than the pagesize * we will often be called with the same page as last time and * a consecutive offset. Optimize this special case. */ 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) { |
1d6165851 block: fix bio_ad... |
531 |
unsigned int prev_bv_len = prev->bv_len; |
80cfd548e [BLOCK] bio: chec... |
532 |
prev->bv_len += len; |
cc371e66e Add bvec_merge_da... |
533 534 535 |
if (q->merge_bvec_fn) { struct bvec_merge_data bvm = { |
1d6165851 block: fix bio_ad... |
536 537 538 539 |
/* prev_bvec is already charged in bi_size, discharge it in order to simulate merging updated prev_bvec as new bvec. */ |
cc371e66e Add bvec_merge_da... |
540 541 |
.bi_bdev = bio->bi_bdev, .bi_sector = bio->bi_sector, |
1d6165851 block: fix bio_ad... |
542 |
.bi_size = bio->bi_size - prev_bv_len, |
cc371e66e Add bvec_merge_da... |
543 544 |
.bi_rw = bio->bi_rw, }; |
9599945ba Revert "blkdev: f... |
545 |
if (q->merge_bvec_fn(q, &bvm, prev) < len) { |
cc371e66e Add bvec_merge_da... |
546 547 548 |
prev->bv_len -= len; return 0; } |
80cfd548e [BLOCK] bio: chec... |
549 550 551 552 553 554 555 |
} goto done; } } if (bio->bi_vcnt >= bio->bi_max_vecs) |
1da177e4c Linux-2.6.12-rc2 |
556 557 558 559 560 561 |
return 0; /* * we might lose a segment or two here, but rather that than * make this too complex. */ |
8a78362c4 block: Consolidat... |
562 |
while (bio->bi_phys_segments >= queue_max_segments(q)) { |
1da177e4c Linux-2.6.12-rc2 |
563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 |
if (retried_segments) return 0; retried_segments = 1; blk_recount_segments(q, bio); } /* * setup the new entry, we might clear it again later if we * cannot add the page */ bvec = &bio->bi_io_vec[bio->bi_vcnt]; bvec->bv_page = page; bvec->bv_len = len; bvec->bv_offset = offset; /* * if queue has other restrictions (eg varying max sector size * depending on offset), it can specify a merge_bvec_fn in the * queue to get further control */ if (q->merge_bvec_fn) { |
cc371e66e Add bvec_merge_da... |
586 587 588 589 590 591 |
struct bvec_merge_data bvm = { .bi_bdev = bio->bi_bdev, .bi_sector = bio->bi_sector, .bi_size = bio->bi_size, .bi_rw = bio->bi_rw, }; |
1da177e4c Linux-2.6.12-rc2 |
592 593 594 595 |
/* * merge_bvec_fn() returns number of bytes it can accept * at this offset */ |
9599945ba Revert "blkdev: f... |
596 |
if (q->merge_bvec_fn(q, &bvm, bvec) < len) { |
1da177e4c Linux-2.6.12-rc2 |
597 598 599 600 601 602 603 604 |
bvec->bv_page = NULL; bvec->bv_len = 0; bvec->bv_offset = 0; return 0; } } /* If we may be able to merge these biovecs, force a recount */ |
b8b3e16cf block: drop virtu... |
605 |
if (bio->bi_vcnt && (BIOVEC_PHYS_MERGEABLE(bvec-1, bvec))) |
1da177e4c Linux-2.6.12-rc2 |
606 607 608 609 |
bio->bi_flags &= ~(1 << BIO_SEG_VALID); bio->bi_vcnt++; bio->bi_phys_segments++; |
80cfd548e [BLOCK] bio: chec... |
610 |
done: |
1da177e4c Linux-2.6.12-rc2 |
611 612 613 614 615 |
bio->bi_size += len; return len; } /** |
6e68af666 [SCSI] Convert SC... |
616 |
* bio_add_pc_page - attempt to add page to bio |
fddfdeafa [BLOCK] A few ker... |
617 |
* @q: the target queue |
6e68af666 [SCSI] Convert SC... |
618 619 620 621 622 623 624 625 626 627 628 |
* @bio: destination bio * @page: page to add * @len: vec entry length * @offset: vec entry offset * * Attempt to add a page to the bio_vec maplist. This can fail for a * number of reasons, such as the bio being full or target block * device limitations. The target block device must allow bio's * smaller than PAGE_SIZE, so it is always possible to add a single * page to an empty bio. This should only be used by REQ_PC bios. */ |
165125e1e [BLOCK] Get rid o... |
629 |
int bio_add_pc_page(struct request_queue *q, struct bio *bio, struct page *page, |
6e68af666 [SCSI] Convert SC... |
630 631 |
unsigned int len, unsigned int offset) { |
ae03bf639 block: Use access... |
632 633 |
return __bio_add_page(q, bio, page, len, offset, queue_max_hw_sectors(q)); |
6e68af666 [SCSI] Convert SC... |
634 |
} |
a112a71d4 fs/bio.c: move EX... |
635 |
EXPORT_SYMBOL(bio_add_pc_page); |
6e68af666 [SCSI] Convert SC... |
636 637 |
/** |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 |
* bio_add_page - attempt to add page to bio * @bio: destination bio * @page: page to add * @len: vec entry length * @offset: vec entry offset * * Attempt to add a page to the bio_vec maplist. This can fail for a * number of reasons, such as the bio being full or target block * device limitations. The target block device must allow bio's * smaller than PAGE_SIZE, so it is always possible to add a single * page to an empty bio. */ int bio_add_page(struct bio *bio, struct page *page, unsigned int len, unsigned int offset) { |
defd94b75 [SCSI] seperate m... |
653 |
struct request_queue *q = bdev_get_queue(bio->bi_bdev); |
ae03bf639 block: Use access... |
654 |
return __bio_add_page(q, bio, page, len, offset, queue_max_sectors(q)); |
1da177e4c Linux-2.6.12-rc2 |
655 |
} |
a112a71d4 fs/bio.c: move EX... |
656 |
EXPORT_SYMBOL(bio_add_page); |
1da177e4c Linux-2.6.12-rc2 |
657 658 659 |
struct bio_map_data { struct bio_vec *iovecs; |
c5dec1c30 block: convert bi... |
660 |
struct sg_iovec *sgvecs; |
152e283fd block: introduce ... |
661 662 |
int nr_sgvecs; int is_our_pages; |
1da177e4c Linux-2.6.12-rc2 |
663 |
}; |
c5dec1c30 block: convert bi... |
664 |
static void bio_set_map_data(struct bio_map_data *bmd, struct bio *bio, |
152e283fd block: introduce ... |
665 666 |
struct sg_iovec *iov, int iov_count, int is_our_pages) |
1da177e4c Linux-2.6.12-rc2 |
667 668 |
{ memcpy(bmd->iovecs, bio->bi_io_vec, sizeof(struct bio_vec) * bio->bi_vcnt); |
c5dec1c30 block: convert bi... |
669 670 |
memcpy(bmd->sgvecs, iov, sizeof(struct sg_iovec) * iov_count); bmd->nr_sgvecs = iov_count; |
152e283fd block: introduce ... |
671 |
bmd->is_our_pages = is_our_pages; |
1da177e4c Linux-2.6.12-rc2 |
672 673 674 675 676 677 |
bio->bi_private = bmd; } static void bio_free_map_data(struct bio_map_data *bmd) { kfree(bmd->iovecs); |
c5dec1c30 block: convert bi... |
678 |
kfree(bmd->sgvecs); |
1da177e4c Linux-2.6.12-rc2 |
679 680 |
kfree(bmd); } |
76029ff37 bio: fix bio_copy... |
681 682 |
static struct bio_map_data *bio_alloc_map_data(int nr_segs, int iov_count, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
683 |
{ |
76029ff37 bio: fix bio_copy... |
684 |
struct bio_map_data *bmd = kmalloc(sizeof(*bmd), gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
685 686 687 |
if (!bmd) return NULL; |
76029ff37 bio: fix bio_copy... |
688 |
bmd->iovecs = kmalloc(sizeof(struct bio_vec) * nr_segs, gfp_mask); |
c5dec1c30 block: convert bi... |
689 690 691 692 |
if (!bmd->iovecs) { kfree(bmd); return NULL; } |
76029ff37 bio: fix bio_copy... |
693 |
bmd->sgvecs = kmalloc(sizeof(struct sg_iovec) * iov_count, gfp_mask); |
c5dec1c30 block: convert bi... |
694 |
if (bmd->sgvecs) |
1da177e4c Linux-2.6.12-rc2 |
695 |
return bmd; |
c5dec1c30 block: convert bi... |
696 |
kfree(bmd->iovecs); |
1da177e4c Linux-2.6.12-rc2 |
697 698 699 |
kfree(bmd); return NULL; } |
aefcc28a3 bio: fix __bio_co... |
700 |
static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs, |
ecb554a84 block: fix sg SG_... |
701 702 |
struct sg_iovec *iov, int iov_count, int to_user, int from_user, int do_free_page) |
c5dec1c30 block: convert bi... |
703 704 705 706 707 |
{ int ret = 0, i; struct bio_vec *bvec; int iov_idx = 0; unsigned int iov_off = 0; |
c5dec1c30 block: convert bi... |
708 709 710 |
__bio_for_each_segment(bvec, bio, i, 0) { char *bv_addr = page_address(bvec->bv_page); |
aefcc28a3 bio: fix __bio_co... |
711 |
unsigned int bv_len = iovecs[i].bv_len; |
c5dec1c30 block: convert bi... |
712 713 714 |
while (bv_len && iov_idx < iov_count) { unsigned int bytes; |
0e0c62123 fs/bio.c: add mis... |
715 |
char __user *iov_addr; |
c5dec1c30 block: convert bi... |
716 717 718 719 720 721 |
bytes = min_t(unsigned int, iov[iov_idx].iov_len - iov_off, bv_len); iov_addr = iov[iov_idx].iov_base + iov_off; if (!ret) { |
ecb554a84 block: fix sg SG_... |
722 |
if (to_user) |
c5dec1c30 block: convert bi... |
723 724 |
ret = copy_to_user(iov_addr, bv_addr, bytes); |
ecb554a84 block: fix sg SG_... |
725 726 727 |
if (from_user) ret = copy_from_user(bv_addr, iov_addr, bytes); |
c5dec1c30 block: convert bi... |
728 729 730 731 732 733 734 735 736 737 738 739 740 741 |
if (ret) ret = -EFAULT; } bv_len -= bytes; bv_addr += bytes; iov_addr += bytes; iov_off += bytes; if (iov[iov_idx].iov_len == iov_off) { iov_idx++; iov_off = 0; } } |
152e283fd block: introduce ... |
742 |
if (do_free_page) |
c5dec1c30 block: convert bi... |
743 744 745 746 747 |
__free_page(bvec->bv_page); } return ret; } |
1da177e4c Linux-2.6.12-rc2 |
748 749 750 751 752 753 754 755 756 757 |
/** * bio_uncopy_user - finish previously mapped bio * @bio: bio being terminated * * Free pages allocated from bio_copy_user() and write back data * to user space in case of a read. */ int bio_uncopy_user(struct bio *bio) { struct bio_map_data *bmd = bio->bi_private; |
818827669 block: make blk_r... |
758 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
759 |
|
818827669 block: make blk_r... |
760 761 |
if (!bio_flagged(bio, BIO_NULL_MAPPED)) ret = __bio_copy_iov(bio, bmd->iovecs, bmd->sgvecs, |
ecb554a84 block: fix sg SG_... |
762 763 |
bmd->nr_sgvecs, bio_data_dir(bio) == READ, 0, bmd->is_our_pages); |
1da177e4c Linux-2.6.12-rc2 |
764 765 766 767 |
bio_free_map_data(bmd); bio_put(bio); return ret; } |
a112a71d4 fs/bio.c: move EX... |
768 |
EXPORT_SYMBOL(bio_uncopy_user); |
1da177e4c Linux-2.6.12-rc2 |
769 770 |
/** |
c5dec1c30 block: convert bi... |
771 |
* bio_copy_user_iov - copy user data to bio |
1da177e4c Linux-2.6.12-rc2 |
772 |
* @q: destination block queue |
152e283fd block: introduce ... |
773 |
* @map_data: pointer to the rq_map_data holding pages (if necessary) |
c5dec1c30 block: convert bi... |
774 775 |
* @iov: the iovec. * @iov_count: number of elements in the iovec |
1da177e4c Linux-2.6.12-rc2 |
776 |
* @write_to_vm: bool indicating writing to pages or not |
a3bce90ed block: add gfp_ma... |
777 |
* @gfp_mask: memory allocation flags |
1da177e4c Linux-2.6.12-rc2 |
778 779 780 781 782 |
* * Prepares and returns a bio for indirect user io, bouncing data * to/from kernel pages as necessary. Must be paired with * call bio_uncopy_user() on io completion. */ |
152e283fd block: introduce ... |
783 784 785 786 |
struct bio *bio_copy_user_iov(struct request_queue *q, struct rq_map_data *map_data, struct sg_iovec *iov, int iov_count, int write_to_vm, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
787 |
{ |
1da177e4c Linux-2.6.12-rc2 |
788 789 790 791 792 |
struct bio_map_data *bmd; struct bio_vec *bvec; struct page *page; struct bio *bio; int i, ret; |
c5dec1c30 block: convert bi... |
793 794 |
int nr_pages = 0; unsigned int len = 0; |
56c451f4b [SCSI] block: fix... |
795 |
unsigned int offset = map_data ? map_data->offset & ~PAGE_MASK : 0; |
1da177e4c Linux-2.6.12-rc2 |
796 |
|
c5dec1c30 block: convert bi... |
797 798 799 800 801 802 803 804 805 806 807 808 |
for (i = 0; i < iov_count; i++) { unsigned long uaddr; unsigned long end; unsigned long start; uaddr = (unsigned long)iov[i].iov_base; end = (uaddr + iov[i].iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; start = uaddr >> PAGE_SHIFT; nr_pages += end - start; len += iov[i].iov_len; } |
69838727b bio: fix memcpy c... |
809 810 |
if (offset) nr_pages++; |
a3bce90ed block: add gfp_ma... |
811 |
bmd = bio_alloc_map_data(nr_pages, iov_count, gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
812 813 |
if (!bmd) return ERR_PTR(-ENOMEM); |
1da177e4c Linux-2.6.12-rc2 |
814 |
ret = -ENOMEM; |
a9e9dc24b bio: use bio_kmal... |
815 |
bio = bio_kmalloc(gfp_mask, nr_pages); |
1da177e4c Linux-2.6.12-rc2 |
816 817 818 819 820 821 |
if (!bio) goto out_bmd; bio->bi_rw |= (!write_to_vm << BIO_RW); ret = 0; |
56c451f4b [SCSI] block: fix... |
822 823 |
if (map_data) { |
e623ddb4e [SCSI] block: fix... |
824 |
nr_pages = 1 << map_data->page_order; |
56c451f4b [SCSI] block: fix... |
825 826 |
i = map_data->offset / PAGE_SIZE; } |
1da177e4c Linux-2.6.12-rc2 |
827 |
while (len) { |
e623ddb4e [SCSI] block: fix... |
828 |
unsigned int bytes = PAGE_SIZE; |
1da177e4c Linux-2.6.12-rc2 |
829 |
|
56c451f4b [SCSI] block: fix... |
830 |
bytes -= offset; |
1da177e4c Linux-2.6.12-rc2 |
831 832 |
if (bytes > len) bytes = len; |
152e283fd block: introduce ... |
833 |
if (map_data) { |
e623ddb4e [SCSI] block: fix... |
834 |
if (i == map_data->nr_entries * nr_pages) { |
152e283fd block: introduce ... |
835 836 837 |
ret = -ENOMEM; break; } |
e623ddb4e [SCSI] block: fix... |
838 839 840 841 842 843 |
page = map_data->pages[i / nr_pages]; page += (i % nr_pages); i++; } else { |
152e283fd block: introduce ... |
844 |
page = alloc_page(q->bounce_gfp | gfp_mask); |
e623ddb4e [SCSI] block: fix... |
845 846 847 848 |
if (!page) { ret = -ENOMEM; break; } |
1da177e4c Linux-2.6.12-rc2 |
849 |
} |
56c451f4b [SCSI] block: fix... |
850 |
if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes) |
1da177e4c Linux-2.6.12-rc2 |
851 |
break; |
1da177e4c Linux-2.6.12-rc2 |
852 853 |
len -= bytes; |
56c451f4b [SCSI] block: fix... |
854 |
offset = 0; |
1da177e4c Linux-2.6.12-rc2 |
855 856 857 858 859 860 861 862 |
} if (ret) goto cleanup; /* * success */ |
ecb554a84 block: fix sg SG_... |
863 864 865 |
if ((!write_to_vm && (!map_data || !map_data->null_mapped)) || (map_data && map_data->from_user)) { ret = __bio_copy_iov(bio, bio->bi_io_vec, iov, iov_count, 0, 1, 0); |
c5dec1c30 block: convert bi... |
866 867 |
if (ret) goto cleanup; |
1da177e4c Linux-2.6.12-rc2 |
868 |
} |
152e283fd block: introduce ... |
869 |
bio_set_map_data(bmd, bio, iov, iov_count, map_data ? 0 : 1); |
1da177e4c Linux-2.6.12-rc2 |
870 871 |
return bio; cleanup: |
152e283fd block: introduce ... |
872 873 874 |
if (!map_data) bio_for_each_segment(bvec, bio, i) __free_page(bvec->bv_page); |
1da177e4c Linux-2.6.12-rc2 |
875 876 877 878 879 880 |
bio_put(bio); out_bmd: bio_free_map_data(bmd); return ERR_PTR(ret); } |
c5dec1c30 block: convert bi... |
881 882 883 |
/** * bio_copy_user - copy user data to bio * @q: destination block queue |
152e283fd block: introduce ... |
884 |
* @map_data: pointer to the rq_map_data holding pages (if necessary) |
c5dec1c30 block: convert bi... |
885 886 887 |
* @uaddr: start of user address * @len: length in bytes * @write_to_vm: bool indicating writing to pages or not |
a3bce90ed block: add gfp_ma... |
888 |
* @gfp_mask: memory allocation flags |
c5dec1c30 block: convert bi... |
889 890 891 892 893 |
* * Prepares and returns a bio for indirect user io, bouncing data * to/from kernel pages as necessary. Must be paired with * call bio_uncopy_user() on io completion. */ |
152e283fd block: introduce ... |
894 895 896 |
struct bio *bio_copy_user(struct request_queue *q, struct rq_map_data *map_data, unsigned long uaddr, unsigned int len, int write_to_vm, gfp_t gfp_mask) |
c5dec1c30 block: convert bi... |
897 898 899 900 901 |
{ struct sg_iovec iov; iov.iov_base = (void __user *)uaddr; iov.iov_len = len; |
152e283fd block: introduce ... |
902 |
return bio_copy_user_iov(q, map_data, &iov, 1, write_to_vm, gfp_mask); |
c5dec1c30 block: convert bi... |
903 |
} |
a112a71d4 fs/bio.c: move EX... |
904 |
EXPORT_SYMBOL(bio_copy_user); |
c5dec1c30 block: convert bi... |
905 |
|
165125e1e [BLOCK] Get rid o... |
906 |
static struct bio *__bio_map_user_iov(struct request_queue *q, |
f1970baf6 [PATCH] Add scatt... |
907 908 |
struct block_device *bdev, struct sg_iovec *iov, int iov_count, |
a3bce90ed block: add gfp_ma... |
909 |
int write_to_vm, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
910 |
{ |
f1970baf6 [PATCH] Add scatt... |
911 912 |
int i, j; int nr_pages = 0; |
1da177e4c Linux-2.6.12-rc2 |
913 914 |
struct page **pages; struct bio *bio; |
f1970baf6 [PATCH] Add scatt... |
915 916 |
int cur_page = 0; int ret, offset; |
1da177e4c Linux-2.6.12-rc2 |
917 |
|
f1970baf6 [PATCH] Add scatt... |
918 919 920 921 922 923 924 925 |
for (i = 0; i < iov_count; i++) { unsigned long uaddr = (unsigned long)iov[i].iov_base; unsigned long len = iov[i].iov_len; unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT; unsigned long start = uaddr >> PAGE_SHIFT; nr_pages += end - start; /* |
ad2d72257 [PATCH] block: ki... |
926 |
* buffer must be aligned to at least hardsector size for now |
f1970baf6 [PATCH] Add scatt... |
927 |
*/ |
ad2d72257 [PATCH] block: ki... |
928 |
if (uaddr & queue_dma_alignment(q)) |
f1970baf6 [PATCH] Add scatt... |
929 930 931 932 |
return ERR_PTR(-EINVAL); } if (!nr_pages) |
1da177e4c Linux-2.6.12-rc2 |
933 |
return ERR_PTR(-EINVAL); |
a9e9dc24b bio: use bio_kmal... |
934 |
bio = bio_kmalloc(gfp_mask, nr_pages); |
1da177e4c Linux-2.6.12-rc2 |
935 936 937 938 |
if (!bio) return ERR_PTR(-ENOMEM); ret = -ENOMEM; |
a3bce90ed block: add gfp_ma... |
939 |
pages = kcalloc(nr_pages, sizeof(struct page *), gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
940 941 |
if (!pages) goto out; |
f1970baf6 [PATCH] Add scatt... |
942 943 944 945 946 947 948 949 |
for (i = 0; i < iov_count; i++) { unsigned long uaddr = (unsigned long)iov[i].iov_base; unsigned long len = iov[i].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; |
f5dd33c49 dio: use get_user... |
950 951 |
ret = get_user_pages_fast(uaddr, local_nr_pages, write_to_vm, &pages[cur_page]); |
991721572 [PATCH] Fix missi... |
952 953 |
if (ret < local_nr_pages) { ret = -EFAULT; |
f1970baf6 [PATCH] Add scatt... |
954 |
goto out_unmap; |
991721572 [PATCH] Fix missi... |
955 |
} |
f1970baf6 [PATCH] Add scatt... |
956 957 958 959 960 961 962 963 964 965 966 967 968 969 |
offset = uaddr & ~PAGE_MASK; for (j = cur_page; j < page_limit; j++) { unsigned int bytes = PAGE_SIZE - offset; if (len <= 0) break; if (bytes > len) bytes = len; /* * sorry... */ |
defd94b75 [SCSI] seperate m... |
970 971 |
if (bio_add_pc_page(q, bio, pages[j], bytes, offset) < bytes) |
f1970baf6 [PATCH] Add scatt... |
972 973 974 975 976 |
break; len -= bytes; offset = 0; } |
1da177e4c Linux-2.6.12-rc2 |
977 |
|
f1970baf6 [PATCH] Add scatt... |
978 |
cur_page = j; |
1da177e4c Linux-2.6.12-rc2 |
979 |
/* |
f1970baf6 [PATCH] Add scatt... |
980 |
* release the pages we didn't map into the bio, if any |
1da177e4c Linux-2.6.12-rc2 |
981 |
*/ |
f1970baf6 [PATCH] Add scatt... |
982 983 |
while (j < page_limit) page_cache_release(pages[j++]); |
1da177e4c Linux-2.6.12-rc2 |
984 |
} |
1da177e4c Linux-2.6.12-rc2 |
985 986 987 988 989 990 991 |
kfree(pages); /* * set data direction, and check if mapped pages need bouncing */ if (!write_to_vm) bio->bi_rw |= (1 << BIO_RW); |
f1970baf6 [PATCH] Add scatt... |
992 |
bio->bi_bdev = bdev; |
1da177e4c Linux-2.6.12-rc2 |
993 994 |
bio->bi_flags |= (1 << BIO_USER_MAPPED); return bio; |
f1970baf6 [PATCH] Add scatt... |
995 996 997 998 999 1000 1001 1002 |
out_unmap: for (i = 0; i < nr_pages; i++) { if(!pages[i]) break; page_cache_release(pages[i]); } out: |
1da177e4c Linux-2.6.12-rc2 |
1003 1004 1005 1006 1007 1008 1009 |
kfree(pages); bio_put(bio); return ERR_PTR(ret); } /** * bio_map_user - map user address into bio |
165125e1e [BLOCK] Get rid o... |
1010 |
* @q: the struct request_queue for the bio |
1da177e4c Linux-2.6.12-rc2 |
1011 1012 1013 1014 |
* @bdev: destination block device * @uaddr: start of user address * @len: length in bytes * @write_to_vm: bool indicating writing to pages or not |
a3bce90ed block: add gfp_ma... |
1015 |
* @gfp_mask: memory allocation flags |
1da177e4c Linux-2.6.12-rc2 |
1016 1017 1018 1019 |
* * Map the user space address into a bio suitable for io to a block * device. Returns an error pointer in case of error. */ |
165125e1e [BLOCK] Get rid o... |
1020 |
struct bio *bio_map_user(struct request_queue *q, struct block_device *bdev, |
a3bce90ed block: add gfp_ma... |
1021 1022 |
unsigned long uaddr, unsigned int len, int write_to_vm, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1023 |
{ |
f1970baf6 [PATCH] Add scatt... |
1024 |
struct sg_iovec iov; |
3f70353ea [PATCH] bogus cas... |
1025 |
iov.iov_base = (void __user *)uaddr; |
f1970baf6 [PATCH] Add scatt... |
1026 |
iov.iov_len = len; |
a3bce90ed block: add gfp_ma... |
1027 |
return bio_map_user_iov(q, bdev, &iov, 1, write_to_vm, gfp_mask); |
f1970baf6 [PATCH] Add scatt... |
1028 |
} |
a112a71d4 fs/bio.c: move EX... |
1029 |
EXPORT_SYMBOL(bio_map_user); |
f1970baf6 [PATCH] Add scatt... |
1030 1031 1032 |
/** * bio_map_user_iov - map user sg_iovec table into bio |
165125e1e [BLOCK] Get rid o... |
1033 |
* @q: the struct request_queue for the bio |
f1970baf6 [PATCH] Add scatt... |
1034 1035 1036 1037 |
* @bdev: destination block device * @iov: the iovec. * @iov_count: number of elements in the iovec * @write_to_vm: bool indicating writing to pages or not |
a3bce90ed block: add gfp_ma... |
1038 |
* @gfp_mask: memory allocation flags |
f1970baf6 [PATCH] Add scatt... |
1039 1040 1041 1042 |
* * Map the user space address into a bio suitable for io to a block * device. Returns an error pointer in case of error. */ |
165125e1e [BLOCK] Get rid o... |
1043 |
struct bio *bio_map_user_iov(struct request_queue *q, struct block_device *bdev, |
f1970baf6 [PATCH] Add scatt... |
1044 |
struct sg_iovec *iov, int iov_count, |
a3bce90ed block: add gfp_ma... |
1045 |
int write_to_vm, gfp_t gfp_mask) |
f1970baf6 [PATCH] Add scatt... |
1046 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1047 |
struct bio *bio; |
a3bce90ed block: add gfp_ma... |
1048 1049 |
bio = __bio_map_user_iov(q, bdev, iov, iov_count, write_to_vm, gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 |
if (IS_ERR(bio)) return bio; /* * subtle -- if __bio_map_user() ended up bouncing a bio, * it would normally disappear when its bi_end_io is run. * however, we need it for the unmap, so grab an extra * reference to it */ bio_get(bio); |
0e75f9063 [PATCH] block: su... |
1060 |
return bio; |
1da177e4c Linux-2.6.12-rc2 |
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 |
} static void __bio_unmap_user(struct bio *bio) { struct bio_vec *bvec; int i; /* * make sure we dirty pages we wrote to */ __bio_for_each_segment(bvec, bio, i, 0) { if (bio_data_dir(bio) == READ) set_page_dirty_lock(bvec->bv_page); page_cache_release(bvec->bv_page); } bio_put(bio); } /** * bio_unmap_user - unmap a bio * @bio: the bio being unmapped * * Unmap a bio previously mapped by bio_map_user(). Must be called with * a process context. * * bio_unmap_user() may sleep. */ void bio_unmap_user(struct bio *bio) { __bio_unmap_user(bio); bio_put(bio); } |
a112a71d4 fs/bio.c: move EX... |
1095 |
EXPORT_SYMBOL(bio_unmap_user); |
1da177e4c Linux-2.6.12-rc2 |
1096 |
|
6712ecf8f Drop 'size' argum... |
1097 |
static void bio_map_kern_endio(struct bio *bio, int err) |
b823825e8 [PATCH] Keep the ... |
1098 |
{ |
b823825e8 [PATCH] Keep the ... |
1099 |
bio_put(bio); |
b823825e8 [PATCH] Keep the ... |
1100 |
} |
165125e1e [BLOCK] Get rid o... |
1101 |
static struct bio *__bio_map_kern(struct request_queue *q, void *data, |
27496a8c6 [PATCH] gfp_t: fs/* |
1102 |
unsigned int len, gfp_t gfp_mask) |
df46b9a44 [PATCH] Add blk_r... |
1103 1104 1105 1106 1107 1108 1109 |
{ 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; |
a9e9dc24b bio: use bio_kmal... |
1110 |
bio = bio_kmalloc(gfp_mask, nr_pages); |
df46b9a44 [PATCH] Add blk_r... |
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 |
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; |
defd94b75 [SCSI] seperate m... |
1123 1124 |
if (bio_add_pc_page(q, bio, virt_to_page(data), bytes, offset) < bytes) |
df46b9a44 [PATCH] Add blk_r... |
1125 1126 1127 1128 1129 1130 |
break; data += bytes; len -= bytes; offset = 0; } |
b823825e8 [PATCH] Keep the ... |
1131 |
bio->bi_end_io = bio_map_kern_endio; |
df46b9a44 [PATCH] Add blk_r... |
1132 1133 1134 1135 1136 |
return bio; } /** * bio_map_kern - map kernel address into bio |
165125e1e [BLOCK] Get rid o... |
1137 |
* @q: the struct request_queue for the bio |
df46b9a44 [PATCH] Add blk_r... |
1138 1139 1140 1141 1142 1143 1144 |
* @data: pointer to buffer to map * @len: length in bytes * @gfp_mask: allocation flags for bio allocation * * Map the kernel address into a bio suitable for io to a block * device. Returns an error pointer in case of error. */ |
165125e1e [BLOCK] Get rid o... |
1145 |
struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, |
27496a8c6 [PATCH] gfp_t: fs/* |
1146 |
gfp_t gfp_mask) |
df46b9a44 [PATCH] Add blk_r... |
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 |
{ struct bio *bio; bio = __bio_map_kern(q, data, len, gfp_mask); if (IS_ERR(bio)) return bio; if (bio->bi_size == len) return bio; /* * Don't support partial mappings. */ bio_put(bio); return ERR_PTR(-EINVAL); } |
a112a71d4 fs/bio.c: move EX... |
1163 |
EXPORT_SYMBOL(bio_map_kern); |
df46b9a44 [PATCH] Add blk_r... |
1164 |
|
68154e90c block: add dma al... |
1165 1166 1167 1168 |
static void bio_copy_kern_endio(struct bio *bio, int err) { struct bio_vec *bvec; const int read = bio_data_dir(bio) == READ; |
76029ff37 bio: fix bio_copy... |
1169 |
struct bio_map_data *bmd = bio->bi_private; |
68154e90c block: add dma al... |
1170 |
int i; |
76029ff37 bio: fix bio_copy... |
1171 |
char *p = bmd->sgvecs[0].iov_base; |
68154e90c block: add dma al... |
1172 1173 1174 |
__bio_for_each_segment(bvec, bio, i, 0) { char *addr = page_address(bvec->bv_page); |
76029ff37 bio: fix bio_copy... |
1175 |
int len = bmd->iovecs[i].bv_len; |
68154e90c block: add dma al... |
1176 |
|
4fc981ef9 bio: always copy ... |
1177 |
if (read) |
76029ff37 bio: fix bio_copy... |
1178 |
memcpy(p, addr, len); |
68154e90c block: add dma al... |
1179 1180 |
__free_page(bvec->bv_page); |
76029ff37 bio: fix bio_copy... |
1181 |
p += len; |
68154e90c block: add dma al... |
1182 |
} |
76029ff37 bio: fix bio_copy... |
1183 |
bio_free_map_data(bmd); |
68154e90c block: add dma al... |
1184 1185 1186 1187 1188 1189 1190 1191 1192 |
bio_put(bio); } /** * bio_copy_kern - copy kernel address into bio * @q: the struct request_queue for the bio * @data: pointer to buffer to copy * @len: length in bytes * @gfp_mask: allocation flags for bio and page allocation |
ffee0259c docbook: fix bio ... |
1193 |
* @reading: data direction is READ |
68154e90c block: add dma al... |
1194 1195 1196 1197 1198 1199 1200 |
* * copy the kernel address into a bio suitable for io to a block * device. Returns an error pointer in case of error. */ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len, gfp_t gfp_mask, int reading) { |
68154e90c block: add dma al... |
1201 1202 |
struct bio *bio; struct bio_vec *bvec; |
4d8ab62e0 bio: convert bio_... |
1203 |
int i; |
68154e90c block: add dma al... |
1204 |
|
4d8ab62e0 bio: convert bio_... |
1205 1206 1207 |
bio = bio_copy_user(q, NULL, (unsigned long)data, len, 1, gfp_mask); if (IS_ERR(bio)) return bio; |
68154e90c block: add dma al... |
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 |
if (!reading) { void *p = data; bio_for_each_segment(bvec, bio, i) { char *addr = page_address(bvec->bv_page); memcpy(addr, p, bvec->bv_len); p += bvec->bv_len; } } |
68154e90c block: add dma al... |
1219 |
bio->bi_end_io = bio_copy_kern_endio; |
76029ff37 bio: fix bio_copy... |
1220 |
|
68154e90c block: add dma al... |
1221 |
return bio; |
68154e90c block: add dma al... |
1222 |
} |
a112a71d4 fs/bio.c: move EX... |
1223 |
EXPORT_SYMBOL(bio_copy_kern); |
68154e90c block: add dma al... |
1224 |
|
1da177e4c Linux-2.6.12-rc2 |
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 |
/* * bio_set_pages_dirty() and bio_check_pages_dirty() are support functions * for performing direct-IO in BIOs. * * The problem is that we cannot run set_page_dirty() from interrupt context * because the required locks are not interrupt-safe. So what we can do is to * mark the pages dirty _before_ performing IO. And in interrupt context, * check that the pages are still dirty. If so, fine. If not, redirty them * in process context. * * We special-case compound pages here: normally this means reads into hugetlb * pages. The logic in here doesn't really work right for compound pages * because the VM does not uniformly chase down the head page in all cases. * But dirtiness of compound pages is pretty meaningless anyway: the VM doesn't * handle them at all. So we skip compound pages here at an early stage. * * Note that this code is very hard to test under normal circumstances because * direct-io pins the pages with get_user_pages(). This makes * is_page_cache_freeable return false, and the VM will not clean the pages. * But other code (eg, pdflush) could clean the pages if they are mapped * pagecache. * * Simply disabling the call to bio_set_pages_dirty() is a good way to test the * deferred bio dirtying paths. */ /* * bio_set_pages_dirty() will mark all the bio's pages as dirty. */ void bio_set_pages_dirty(struct bio *bio) { struct bio_vec *bvec = bio->bi_io_vec; int i; for (i = 0; i < bio->bi_vcnt; i++) { struct page *page = bvec[i].bv_page; if (page && !PageCompound(page)) set_page_dirty_lock(page); } } |
86b6c7a7f fs/block_dev.c: r... |
1266 |
static void bio_release_pages(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 |
{ struct bio_vec *bvec = bio->bi_io_vec; int i; for (i = 0; i < bio->bi_vcnt; i++) { struct page *page = bvec[i].bv_page; if (page) put_page(page); } } /* * bio_check_pages_dirty() will check that all the BIO's pages are still dirty. * If they are, then fine. If, however, some pages are clean then they must * have been written out during the direct-IO read. So we take another ref on * the BIO and the offending pages and re-dirty the pages in process context. * * It is expected that bio_check_pages_dirty() will wholly own the BIO from * here on. It will run one page_cache_release() against each page and will * run one bio_put() against the BIO. */ |
65f27f384 WorkStruct: Pass ... |
1289 |
static void bio_dirty_fn(struct work_struct *work); |
1da177e4c Linux-2.6.12-rc2 |
1290 |
|
65f27f384 WorkStruct: Pass ... |
1291 |
static DECLARE_WORK(bio_dirty_work, bio_dirty_fn); |
1da177e4c Linux-2.6.12-rc2 |
1292 1293 1294 1295 1296 1297 |
static DEFINE_SPINLOCK(bio_dirty_lock); static struct bio *bio_dirty_list; /* * This runs in process context */ |
65f27f384 WorkStruct: Pass ... |
1298 |
static void bio_dirty_fn(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 |
{ 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 = bio->bi_io_vec; int nr_clean_pages = 0; int i; for (i = 0; i < bio->bi_vcnt; i++) { struct page *page = bvec[i].bv_page; if (PageDirty(page) || PageCompound(page)) { page_cache_release(page); bvec[i].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); } } |
2d4dc890b block: add helper... |
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 |
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE void bio_flush_dcache_pages(struct bio *bi) { int i; struct bio_vec *bvec; bio_for_each_segment(bvec, bi, i) flush_dcache_page(bvec->bv_page); } EXPORT_SYMBOL(bio_flush_dcache_pages); #endif |
1da177e4c Linux-2.6.12-rc2 |
1358 1359 1360 |
/** * bio_endio - end I/O on a bio * @bio: bio |
1da177e4c Linux-2.6.12-rc2 |
1361 1362 1363 |
* @error: error, if any * * Description: |
6712ecf8f Drop 'size' argum... |
1364 |
* bio_endio() will end I/O on the whole bio. bio_endio() is the |
5bb23a688 Don't decrement b... |
1365 1366 1367 1368 1369 1370 |
* preferred way to end I/O on a bio, it takes care of clearing * BIO_UPTODATE on error. @error is 0 on success, and and one of the * established -Exxxx (-EIO, for instance) error values in case * something went wrong. Noone should call bi_end_io() directly on a * bio unless they own it and thus know that it has an end_io * function. |
1da177e4c Linux-2.6.12-rc2 |
1371 |
**/ |
6712ecf8f Drop 'size' argum... |
1372 |
void bio_endio(struct bio *bio, int error) |
1da177e4c Linux-2.6.12-rc2 |
1373 1374 1375 |
{ if (error) clear_bit(BIO_UPTODATE, &bio->bi_flags); |
9cc54d40b Only call bi_end_... |
1376 1377 |
else if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) error = -EIO; |
1da177e4c Linux-2.6.12-rc2 |
1378 |
|
5bb23a688 Don't decrement b... |
1379 |
if (bio->bi_end_io) |
6712ecf8f Drop 'size' argum... |
1380 |
bio->bi_end_io(bio, error); |
1da177e4c Linux-2.6.12-rc2 |
1381 |
} |
a112a71d4 fs/bio.c: move EX... |
1382 |
EXPORT_SYMBOL(bio_endio); |
1da177e4c Linux-2.6.12-rc2 |
1383 1384 1385 1386 1387 |
void bio_pair_release(struct bio_pair *bp) { if (atomic_dec_and_test(&bp->cnt)) { struct bio *master = bp->bio1.bi_private; |
6712ecf8f Drop 'size' argum... |
1388 |
bio_endio(master, bp->error); |
1da177e4c Linux-2.6.12-rc2 |
1389 1390 1391 |
mempool_free(bp, bp->bio2.bi_private); } } |
a112a71d4 fs/bio.c: move EX... |
1392 |
EXPORT_SYMBOL(bio_pair_release); |
1da177e4c Linux-2.6.12-rc2 |
1393 |
|
6712ecf8f Drop 'size' argum... |
1394 |
static void bio_pair_end_1(struct bio *bi, int err) |
1da177e4c Linux-2.6.12-rc2 |
1395 1396 1397 1398 1399 |
{ struct bio_pair *bp = container_of(bi, struct bio_pair, bio1); if (err) bp->error = err; |
1da177e4c Linux-2.6.12-rc2 |
1400 |
bio_pair_release(bp); |
1da177e4c Linux-2.6.12-rc2 |
1401 |
} |
6712ecf8f Drop 'size' argum... |
1402 |
static void bio_pair_end_2(struct bio *bi, int err) |
1da177e4c Linux-2.6.12-rc2 |
1403 1404 1405 1406 1407 |
{ struct bio_pair *bp = container_of(bi, struct bio_pair, bio2); if (err) bp->error = err; |
1da177e4c Linux-2.6.12-rc2 |
1408 |
bio_pair_release(bp); |
1da177e4c Linux-2.6.12-rc2 |
1409 1410 1411 |
} /* |
c7eee1b83 trivial: Fix typo... |
1412 |
* split a bio - only worry about a bio with a single page in its iovec |
1da177e4c Linux-2.6.12-rc2 |
1413 |
*/ |
6feef531f block: mark bio_s... |
1414 |
struct bio_pair *bio_split(struct bio *bi, int first_sectors) |
1da177e4c Linux-2.6.12-rc2 |
1415 |
{ |
6feef531f block: mark bio_s... |
1416 |
struct bio_pair *bp = mempool_alloc(bio_split_pool, GFP_NOIO); |
1da177e4c Linux-2.6.12-rc2 |
1417 1418 1419 |
if (!bp) return bp; |
5f3ea37c7 blktrace: port to... |
1420 |
trace_block_split(bdev_get_queue(bi->bi_bdev), bi, |
2056a782f [PATCH] Block que... |
1421 |
bi->bi_sector + first_sectors); |
1da177e4c Linux-2.6.12-rc2 |
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 |
BUG_ON(bi->bi_vcnt != 1); BUG_ON(bi->bi_idx != 0); atomic_set(&bp->cnt, 3); bp->error = 0; bp->bio1 = *bi; bp->bio2 = *bi; bp->bio2.bi_sector += first_sectors; bp->bio2.bi_size -= first_sectors << 9; bp->bio1.bi_size = first_sectors << 9; bp->bv1 = bi->bi_io_vec[0]; bp->bv2 = bi->bi_io_vec[0]; bp->bv2.bv_offset += first_sectors << 9; bp->bv2.bv_len -= first_sectors << 9; bp->bv1.bv_len = first_sectors << 9; bp->bio1.bi_io_vec = &bp->bv1; bp->bio2.bi_io_vec = &bp->bv2; |
a2eb0c101 [PATCH] md: Make ... |
1440 1441 |
bp->bio1.bi_max_vecs = 1; bp->bio2.bi_max_vecs = 1; |
1da177e4c Linux-2.6.12-rc2 |
1442 1443 1444 1445 |
bp->bio1.bi_end_io = bio_pair_end_1; bp->bio2.bi_end_io = bio_pair_end_2; bp->bio1.bi_private = bi; |
6feef531f block: mark bio_s... |
1446 |
bp->bio2.bi_private = bio_split_pool; |
1da177e4c Linux-2.6.12-rc2 |
1447 |
|
7ba1ba12e block: Block laye... |
1448 1449 |
if (bio_integrity(bi)) bio_integrity_split(bi, bp, first_sectors); |
1da177e4c Linux-2.6.12-rc2 |
1450 1451 |
return bp; } |
a112a71d4 fs/bio.c: move EX... |
1452 |
EXPORT_SYMBOL(bio_split); |
1da177e4c Linux-2.6.12-rc2 |
1453 |
|
ad3316bf4 block: Find bio s... |
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 |
/** * bio_sector_offset - Find hardware sector offset in bio * @bio: bio to inspect * @index: bio_vec index * @offset: offset in bv_page * * Return the number of hardware sectors between beginning of bio * and an end point indicated by a bio_vec index and an offset * within that vector's page. */ sector_t bio_sector_offset(struct bio *bio, unsigned short index, unsigned int offset) { |
e1defc4ff block: Do away wi... |
1467 |
unsigned int sector_sz; |
ad3316bf4 block: Find bio s... |
1468 1469 1470 |
struct bio_vec *bv; sector_t sectors; int i; |
e1defc4ff block: Do away wi... |
1471 |
sector_sz = queue_logical_block_size(bio->bi_bdev->bd_disk->queue); |
ad3316bf4 block: Find bio s... |
1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 |
sectors = 0; if (index >= bio->bi_idx) index = bio->bi_vcnt - 1; __bio_for_each_segment(bv, bio, i, 0) { if (i == index) { if (offset > bv->bv_offset) sectors += (offset - bv->bv_offset) / sector_sz; break; } sectors += bv->bv_len / sector_sz; } return sectors; } EXPORT_SYMBOL(bio_sector_offset); |
1da177e4c Linux-2.6.12-rc2 |
1490 1491 1492 1493 1494 |
/* * create memory pools for biovec's in a bio_set. * use the global biovec slabs created for general use. */ |
5972511b7 [BLOCK] Don't pin... |
1495 |
static int biovec_create_pools(struct bio_set *bs, int pool_entries) |
1da177e4c Linux-2.6.12-rc2 |
1496 |
{ |
7ff9345ff bio: only mempool... |
1497 |
struct biovec_slab *bp = bvec_slabs + BIOVEC_MAX_IDX; |
1da177e4c Linux-2.6.12-rc2 |
1498 |
|
7ff9345ff bio: only mempool... |
1499 1500 1501 |
bs->bvec_pool = mempool_create_slab_pool(pool_entries, bp->slab); if (!bs->bvec_pool) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1502 |
|
1da177e4c Linux-2.6.12-rc2 |
1503 1504 1505 1506 1507 |
return 0; } static void biovec_free_pools(struct bio_set *bs) { |
7ff9345ff bio: only mempool... |
1508 |
mempool_destroy(bs->bvec_pool); |
1da177e4c Linux-2.6.12-rc2 |
1509 1510 1511 1512 1513 1514 |
} void bioset_free(struct bio_set *bs) { if (bs->bio_pool) mempool_destroy(bs->bio_pool); |
7878cba9f block: Create bip... |
1515 |
bioset_integrity_free(bs); |
1da177e4c Linux-2.6.12-rc2 |
1516 |
biovec_free_pools(bs); |
bb799ca02 bio: allow indivi... |
1517 |
bio_put_slab(bs); |
1da177e4c Linux-2.6.12-rc2 |
1518 1519 1520 |
kfree(bs); } |
a112a71d4 fs/bio.c: move EX... |
1521 |
EXPORT_SYMBOL(bioset_free); |
1da177e4c Linux-2.6.12-rc2 |
1522 |
|
bb799ca02 bio: allow indivi... |
1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 |
/** * bioset_create - Create a bio_set * @pool_size: Number of bio and bio_vecs to cache in the mempool * @front_pad: Number of bytes to allocate in front of the returned bio * * Description: * Set up a bio_set to be used with @bio_alloc_bioset. Allows the caller * to ask for a number of bytes to be allocated in front of the bio. * Front pad allocation is useful for embedding the bio inside * another structure, to avoid allocating extra data to go with the bio. * Note that the bio must be embedded at the END of that structure always, * or things will break badly. */ struct bio_set *bioset_create(unsigned int pool_size, unsigned int front_pad) |
1da177e4c Linux-2.6.12-rc2 |
1537 |
{ |
392ddc329 bio: add support ... |
1538 |
unsigned int back_pad = BIO_INLINE_VECS * sizeof(struct bio_vec); |
1b4344986 bio: move the sla... |
1539 |
struct bio_set *bs; |
1da177e4c Linux-2.6.12-rc2 |
1540 |
|
1b4344986 bio: move the sla... |
1541 |
bs = kzalloc(sizeof(*bs), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1542 1543 |
if (!bs) return NULL; |
bb799ca02 bio: allow indivi... |
1544 |
bs->front_pad = front_pad; |
1b4344986 bio: move the sla... |
1545 |
|
392ddc329 bio: add support ... |
1546 |
bs->bio_slab = bio_find_or_create_slab(front_pad + back_pad); |
bb799ca02 bio: allow indivi... |
1547 1548 1549 1550 1551 1552 |
if (!bs->bio_slab) { kfree(bs); return NULL; } bs->bio_pool = mempool_create_slab_pool(pool_size, bs->bio_slab); |
1da177e4c Linux-2.6.12-rc2 |
1553 1554 |
if (!bs->bio_pool) goto bad; |
7878cba9f block: Create bip... |
1555 1556 |
if (bioset_integrity_create(bs, pool_size)) goto bad; |
bb799ca02 bio: allow indivi... |
1557 |
if (!biovec_create_pools(bs, pool_size)) |
1da177e4c Linux-2.6.12-rc2 |
1558 1559 1560 1561 1562 1563 |
return bs; bad: bioset_free(bs); return NULL; } |
a112a71d4 fs/bio.c: move EX... |
1564 |
EXPORT_SYMBOL(bioset_create); |
1da177e4c Linux-2.6.12-rc2 |
1565 1566 1567 1568 1569 1570 1571 1572 |
static void __init biovec_init_slabs(void) { int i; for (i = 0; i < BIOVEC_NR_POOLS; i++) { int size; struct biovec_slab *bvs = bvec_slabs + i; |
a7fcd37cd block: don't crea... |
1573 1574 1575 1576 1577 1578 |
#ifndef CONFIG_BLK_DEV_INTEGRITY if (bvs->nr_vecs <= BIO_INLINE_VECS) { bvs->slab = NULL; continue; } #endif |
1da177e4c Linux-2.6.12-rc2 |
1579 1580 |
size = bvs->nr_vecs * sizeof(struct bio_vec); bvs->slab = kmem_cache_create(bvs->name, size, 0, |
20c2df83d mm: Remove slab d... |
1581 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1582 1583 1584 1585 1586 |
} } static int __init init_bio(void) { |
bb799ca02 bio: allow indivi... |
1587 1588 1589 1590 1591 1592 |
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 "); |
1da177e4c Linux-2.6.12-rc2 |
1593 |
|
7878cba9f block: Create bip... |
1594 |
bio_integrity_init(); |
1da177e4c Linux-2.6.12-rc2 |
1595 |
biovec_init_slabs(); |
bb799ca02 bio: allow indivi... |
1596 |
fs_bio_set = bioset_create(BIO_POOL_SIZE, 0); |
1da177e4c Linux-2.6.12-rc2 |
1597 1598 1599 |
if (!fs_bio_set) panic("bio: can't allocate bios "); |
0eaae62ab [PATCH] mempool: ... |
1600 1601 |
bio_split_pool = mempool_create_kmalloc_pool(BIO_SPLIT_ENTRIES, sizeof(struct bio_pair)); |
1da177e4c Linux-2.6.12-rc2 |
1602 1603 1604 1605 1606 1607 |
if (!bio_split_pool) panic("bio: can't create split pool "); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1608 |
subsys_initcall(init_bio); |