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block/bio.c
51.5 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> |
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#include <linux/uio.h> |
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#include <linux/iocontext.h> |
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#include <linux/slab.h> #include <linux/init.h> #include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/mempool.h> #include <linux/workqueue.h> |
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#include <linux/cgroup.h> |
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|
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#include <trace/events/block.h> |
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#include "blk.h" |
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|
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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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/* * 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, n) { .nr_vecs = x, .name = "biovec-"#n } |
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static struct biovec_slab bvec_slabs[BVEC_POOL_NR] __read_mostly = { |
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BV(1, 1), BV(4, 4), BV(16, 16), BV(64, 64), BV(128, 128), BV(BIO_MAX_PAGES, max), |
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}; #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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EXPORT_SYMBOL(fs_bio_set); |
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|
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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; |
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struct bio_slab *bslab, *new_bio_slabs; |
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unsigned int new_bio_slab_max; |
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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) { |
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new_bio_slab_max = bio_slab_max << 1; |
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new_bio_slabs = krealloc(bio_slabs, |
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new_bio_slab_max * sizeof(struct bio_slab), |
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GFP_KERNEL); if (!new_bio_slabs) |
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goto out_unlock; |
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bio_slab_max = new_bio_slab_max; |
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bio_slabs = new_bio_slabs; |
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} if (entry == -1) entry = bio_slab_nr++; bslab = &bio_slabs[entry]; snprintf(bslab->name, sizeof(bslab->name), "bio-%d", entry); |
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slab = kmem_cache_create(bslab->name, sz, ARCH_KMALLOC_MINALIGN, SLAB_HWCACHE_ALIGN, NULL); |
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if (!slab) goto out_unlock; |
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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) { |
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return bvec_slabs[--idx].nr_vecs; |
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} |
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void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned int idx) |
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{ |
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if (!idx) return; idx--; BIO_BUG_ON(idx >= BVEC_POOL_NR); |
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|
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if (idx == BVEC_POOL_MAX) { |
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mempool_free(bv, pool); |
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} else { |
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struct biovec_slab *bvs = bvec_slabs + idx; kmem_cache_free(bvs->slab, bv); } } |
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struct bio_vec *bvec_alloc(gfp_t gfp_mask, int nr, unsigned long *idx, mempool_t *pool) |
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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. */ |
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if (*idx == BVEC_POOL_MAX) { |
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fallback: |
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bvl = mempool_alloc(pool, gfp_mask); |
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} else { struct biovec_slab *bvs = bvec_slabs + *idx; |
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gfp_t __gfp_mask = gfp_mask & ~(__GFP_DIRECT_RECLAIM | __GFP_IO); |
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|
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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_DIRECT_RECLAIM |
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* is set, retry with the 1-entry mempool |
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*/ |
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bvl = kmem_cache_alloc(bvs->slab, __gfp_mask); |
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if (unlikely(!bvl && (gfp_mask & __GFP_DIRECT_RECLAIM))) { |
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*idx = BVEC_POOL_MAX; |
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goto fallback; } } |
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(*idx)++; |
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return bvl; } |
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void bio_uninit(struct bio *bio) |
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{ |
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bio_disassociate_task(bio); |
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} |
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EXPORT_SYMBOL(bio_uninit); |
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|
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static void bio_free(struct bio *bio) { struct bio_set *bs = bio->bi_pool; void *p; |
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bio_uninit(bio); |
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if (bs) { |
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bvec_free(bs->bvec_pool, bio->bi_io_vec, BVEC_POOL_IDX(bio)); |
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/* * If we have front padding, adjust the bio pointer before freeing */ p = bio; |
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p -= bs->front_pad; |
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mempool_free(p, bs->bio_pool); } else { /* Bio was allocated by bio_kmalloc() */ kfree(bio); } |
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} |
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/* * Users of this function have their own bio allocation. Subsequently, * they must remember to pair any call to bio_init() with bio_uninit() * when IO has completed, or when the bio is released. */ |
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void bio_init(struct bio *bio, struct bio_vec *table, unsigned short max_vecs) |
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{ |
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memset(bio, 0, sizeof(*bio)); |
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atomic_set(&bio->__bi_remaining, 1); |
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atomic_set(&bio->__bi_cnt, 1); |
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bio->bi_io_vec = table; bio->bi_max_vecs = max_vecs; |
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} |
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EXPORT_SYMBOL(bio_init); |
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/** |
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* bio_reset - reinitialize a bio * @bio: bio to reset * * Description: * After calling bio_reset(), @bio will be in the same state as a freshly * allocated bio returned bio bio_alloc_bioset() - the only fields that are * preserved are the ones that are initialized by bio_alloc_bioset(). See * comment in struct bio. */ void bio_reset(struct bio *bio) { unsigned long flags = bio->bi_flags & (~0UL << BIO_RESET_BITS); |
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bio_uninit(bio); |
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memset(bio, 0, BIO_RESET_BYTES); |
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bio->bi_flags = flags; |
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atomic_set(&bio->__bi_remaining, 1); |
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} EXPORT_SYMBOL(bio_reset); |
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static struct bio *__bio_chain_endio(struct bio *bio) |
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{ |
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struct bio *parent = bio->bi_private; |
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if (!parent->bi_status) parent->bi_status = bio->bi_status; |
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bio_put(bio); |
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return parent; } static void bio_chain_endio(struct bio *bio) { bio_endio(__bio_chain_endio(bio)); |
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} /** * bio_chain - chain bio completions |
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* @bio: the target bio * @parent: the @bio's parent bio |
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* * The caller won't have a bi_end_io called when @bio completes - instead, * @parent's bi_end_io won't be called until both @parent and @bio have * completed; the chained bio will also be freed when it completes. * * The caller must not set bi_private or bi_end_io in @bio. */ void bio_chain(struct bio *bio, struct bio *parent) { BUG_ON(bio->bi_private || bio->bi_end_io); bio->bi_private = parent; bio->bi_end_io = bio_chain_endio; |
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bio_inc_remaining(parent); |
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} EXPORT_SYMBOL(bio_chain); |
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static void bio_alloc_rescue(struct work_struct *work) { struct bio_set *bs = container_of(work, struct bio_set, rescue_work); struct bio *bio; while (1) { spin_lock(&bs->rescue_lock); bio = bio_list_pop(&bs->rescue_list); spin_unlock(&bs->rescue_lock); if (!bio) break; generic_make_request(bio); } } static void punt_bios_to_rescuer(struct bio_set *bs) { struct bio_list punt, nopunt; struct bio *bio; |
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if (WARN_ON_ONCE(!bs->rescue_workqueue)) return; |
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/* * In order to guarantee forward progress we must punt only bios that * were allocated from this bio_set; otherwise, if there was a bio on * there for a stacking driver higher up in the stack, processing it * could require allocating bios from this bio_set, and doing that from * our own rescuer would be bad. * * Since bio lists are singly linked, pop them all instead of trying to * remove from the middle of the list: */ bio_list_init(&punt); bio_list_init(&nopunt); |
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while ((bio = bio_list_pop(¤t->bio_list[0]))) |
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bio_list_add(bio->bi_pool == bs ? &punt : &nopunt, bio); |
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current->bio_list[0] = nopunt; |
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|
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bio_list_init(&nopunt); while ((bio = bio_list_pop(¤t->bio_list[1]))) bio_list_add(bio->bi_pool == bs ? &punt : &nopunt, bio); current->bio_list[1] = nopunt; |
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spin_lock(&bs->rescue_lock); bio_list_merge(&bs->rescue_list, &punt); spin_unlock(&bs->rescue_lock); queue_work(bs->rescue_workqueue, &bs->rescue_work); } |
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/** |
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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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* If @bs is NULL, uses kmalloc() to allocate the bio; else the allocation is * backed by the @bs's mempool. * |
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* When @bs is not NULL, if %__GFP_DIRECT_RECLAIM 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 deadlocks under memory pressure. |
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* |
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* Note that when running under generic_make_request() (i.e. any block * driver), bios are not submitted until after you return - see the code in * generic_make_request() that converts recursion into iteration, to prevent * stack overflows. * * This would normally mean allocating multiple bios under * generic_make_request() would be susceptible to deadlocks, but we have * deadlock avoidance code that resubmits any blocked bios from a rescuer * thread. * * However, we do not guarantee forward progress for allocations from other * mempools. Doing multiple allocations from the same mempool under * generic_make_request() should be avoided - instead, use bio_set's front_pad * for per bio allocations. * |
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* RETURNS: * Pointer to new bio on success, NULL on failure. */ |
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struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned int nr_iovecs, struct bio_set *bs) |
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{ |
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gfp_t saved_gfp = gfp_mask; |
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unsigned front_pad; unsigned inline_vecs; |
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struct bio_vec *bvl = NULL; |
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struct bio *bio; void *p; |
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if (!bs) { if (nr_iovecs > UIO_MAXIOV) return NULL; p = kmalloc(sizeof(struct bio) + nr_iovecs * sizeof(struct bio_vec), gfp_mask); front_pad = 0; inline_vecs = nr_iovecs; } else { |
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/* should not use nobvec bioset for nr_iovecs > 0 */ if (WARN_ON_ONCE(!bs->bvec_pool && nr_iovecs > 0)) return NULL; |
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/* * generic_make_request() converts recursion to iteration; this * means if we're running beneath it, any bios we allocate and * submit will not be submitted (and thus freed) until after we * return. * * This exposes us to a potential deadlock if we allocate * multiple bios from the same bio_set() while running * underneath generic_make_request(). If we were to allocate * multiple bios (say a stacking block driver that was splitting * bios), we would deadlock if we exhausted the mempool's * reserve. * * We solve this, and guarantee forward progress, with a rescuer * workqueue per bio_set. If we go to allocate and there are * bios on current->bio_list, we first try the allocation |
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* without __GFP_DIRECT_RECLAIM; if that fails, we punt those * bios we would be blocking to the rescuer workqueue before * we retry with the original gfp_flags. |
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*/ |
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if (current->bio_list && (!bio_list_empty(¤t->bio_list[0]) || |
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!bio_list_empty(¤t->bio_list[1])) && bs->rescue_workqueue) |
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gfp_mask &= ~__GFP_DIRECT_RECLAIM; |
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|
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p = mempool_alloc(bs->bio_pool, gfp_mask); |
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if (!p && gfp_mask != saved_gfp) { punt_bios_to_rescuer(bs); gfp_mask = saved_gfp; p = mempool_alloc(bs->bio_pool, gfp_mask); } |
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front_pad = bs->front_pad; inline_vecs = BIO_INLINE_VECS; } |
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if (unlikely(!p)) return NULL; |
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|
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bio = p + front_pad; |
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bio_init(bio, NULL, 0); |
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|
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if (nr_iovecs > inline_vecs) { |
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unsigned long idx = 0; |
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bvl = bvec_alloc(gfp_mask, nr_iovecs, &idx, bs->bvec_pool); |
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if (!bvl && gfp_mask != saved_gfp) { punt_bios_to_rescuer(bs); gfp_mask = saved_gfp; |
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bvl = bvec_alloc(gfp_mask, nr_iovecs, &idx, bs->bvec_pool); |
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} |
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if (unlikely(!bvl)) goto err_free; |
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|
ed996a52c block: simplify a... |
494 |
bio->bi_flags |= idx << BVEC_POOL_OFFSET; |
3f86a82ae block: Consolidat... |
495 496 |
} else if (nr_iovecs) { bvl = bio->bi_inline_vecs; |
1da177e4c Linux-2.6.12-rc2 |
497 |
} |
3f86a82ae block: Consolidat... |
498 499 |
bio->bi_pool = bs; |
34053979f block: cleanup bi... |
500 |
bio->bi_max_vecs = nr_iovecs; |
34053979f block: cleanup bi... |
501 |
bio->bi_io_vec = bvl; |
1da177e4c Linux-2.6.12-rc2 |
502 |
return bio; |
34053979f block: cleanup bi... |
503 504 |
err_free: |
451a9ebf6 bio: fix bio_kmal... |
505 |
mempool_free(p, bs->bio_pool); |
34053979f block: cleanup bi... |
506 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
507 |
} |
a112a71d4 fs/bio.c: move EX... |
508 |
EXPORT_SYMBOL(bio_alloc_bioset); |
1da177e4c Linux-2.6.12-rc2 |
509 |
|
1da177e4c Linux-2.6.12-rc2 |
510 511 512 |
void zero_fill_bio(struct bio *bio) { unsigned long flags; |
7988613b0 block: Convert bi... |
513 514 |
struct bio_vec bv; struct bvec_iter iter; |
1da177e4c Linux-2.6.12-rc2 |
515 |
|
7988613b0 block: Convert bi... |
516 517 518 519 |
bio_for_each_segment(bv, bio, iter) { char *data = bvec_kmap_irq(&bv, &flags); memset(data, 0, bv.bv_len); flush_dcache_page(bv.bv_page); |
1da177e4c Linux-2.6.12-rc2 |
520 521 522 523 524 525 526 527 528 529 530 |
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 |
9b10f6a9c block: remove bio... |
531 |
* bio_alloc, bio_get or bio_clone_*. The last put of a bio will free it. |
1da177e4c Linux-2.6.12-rc2 |
532 533 534 |
**/ void bio_put(struct bio *bio) { |
dac56212e bio: skip atomic ... |
535 |
if (!bio_flagged(bio, BIO_REFFED)) |
4254bba17 block: Kill bi_de... |
536 |
bio_free(bio); |
dac56212e bio: skip atomic ... |
537 538 539 540 541 542 543 544 545 |
else { BIO_BUG_ON(!atomic_read(&bio->__bi_cnt)); /* * last put frees it */ if (atomic_dec_and_test(&bio->__bi_cnt)) bio_free(bio); } |
1da177e4c Linux-2.6.12-rc2 |
546 |
} |
a112a71d4 fs/bio.c: move EX... |
547 |
EXPORT_SYMBOL(bio_put); |
1da177e4c Linux-2.6.12-rc2 |
548 |
|
165125e1e [BLOCK] Get rid o... |
549 |
inline int bio_phys_segments(struct request_queue *q, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
550 551 552 553 554 555 |
{ if (unlikely(!bio_flagged(bio, BIO_SEG_VALID))) blk_recount_segments(q, bio); return bio->bi_phys_segments; } |
a112a71d4 fs/bio.c: move EX... |
556 |
EXPORT_SYMBOL(bio_phys_segments); |
1da177e4c Linux-2.6.12-rc2 |
557 |
|
1da177e4c Linux-2.6.12-rc2 |
558 |
/** |
59d276fe0 block: Add bio_cl... |
559 560 561 562 563 564 565 566 567 568 569 570 |
* __bio_clone_fast - clone a bio that shares the original bio's biovec * @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. * * Caller must ensure that @bio_src is not freed before @bio. */ void __bio_clone_fast(struct bio *bio, struct bio *bio_src) { |
ed996a52c block: simplify a... |
571 |
BUG_ON(bio->bi_pool && BVEC_POOL_IDX(bio)); |
59d276fe0 block: Add bio_cl... |
572 573 |
/* |
74d46992e block: replace bi... |
574 |
* most users will be overriding ->bi_disk with a new target, |
59d276fe0 block: Add bio_cl... |
575 576 |
* so we don't set nor calculate new physical/hw segment counts here */ |
74d46992e block: replace bi... |
577 |
bio->bi_disk = bio_src->bi_disk; |
5d62da3a8 bio: ensure __bio... |
578 |
bio->bi_partno = bio_src->bi_partno; |
b7c44ed9d block: manipulate... |
579 |
bio_set_flag(bio, BIO_CLONED); |
3ef1c33f9 block-throttle: a... |
580 581 |
if (bio_flagged(bio_src, BIO_THROTTLED)) bio_set_flag(bio, BIO_THROTTLED); |
1eff9d322 block: rename bio... |
582 |
bio->bi_opf = bio_src->bi_opf; |
cb6934f8e block: add suppor... |
583 |
bio->bi_write_hint = bio_src->bi_write_hint; |
59d276fe0 block: Add bio_cl... |
584 585 |
bio->bi_iter = bio_src->bi_iter; bio->bi_io_vec = bio_src->bi_io_vec; |
20bd723ec block: add missin... |
586 587 |
bio_clone_blkcg_association(bio, bio_src); |
59d276fe0 block: Add bio_cl... |
588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 |
} EXPORT_SYMBOL(__bio_clone_fast); /** * bio_clone_fast - clone a bio that shares the original bio's biovec * @bio: bio to clone * @gfp_mask: allocation priority * @bs: bio_set to allocate from * * Like __bio_clone_fast, only also allocates the returned bio */ struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs) { struct bio *b; b = bio_alloc_bioset(gfp_mask, 0, bs); if (!b) return NULL; __bio_clone_fast(b, bio); if (bio_integrity(bio)) { int ret; ret = bio_integrity_clone(b, bio, gfp_mask); if (ret < 0) { bio_put(b); return NULL; } } return b; } EXPORT_SYMBOL(bio_clone_fast); |
f45958756 block: remove bio... |
623 624 625 626 627 628 629 630 631 632 633 |
/** * bio_clone_bioset - clone a bio * @bio_src: bio to clone * @gfp_mask: allocation priority * @bs: bio_set to allocate from * * Clone bio. Caller will own the returned bio, but not the actual data it * points to. Reference count of returned bio will be one. */ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask, struct bio_set *bs) |
1da177e4c Linux-2.6.12-rc2 |
634 |
{ |
bdb532074 block: Refactor b... |
635 636 637 |
struct bvec_iter iter; struct bio_vec bv; struct bio *bio; |
1da177e4c Linux-2.6.12-rc2 |
638 |
|
bdb532074 block: Refactor b... |
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 |
/* * Pre immutable biovecs, __bio_clone() used to just do a memcpy from * bio_src->bi_io_vec to bio->bi_io_vec. * * We can't do that anymore, because: * * - The point of cloning the biovec is to produce a bio with a biovec * the caller can modify: bi_idx and bi_bvec_done should be 0. * * - The original bio could've had more than BIO_MAX_PAGES biovecs; if * we tried to clone the whole thing bio_alloc_bioset() would fail. * But the clone should succeed as long as the number of biovecs we * actually need to allocate is fewer than BIO_MAX_PAGES. * * - Lastly, bi_vcnt should not be looked at or relied upon by code * that does not own the bio - reason being drivers don't use it for * iterating over the biovec anymore, so expecting it to be kept up * to date (i.e. for clones that share the parent biovec) is just * asking for trouble and would force extra work on * __bio_clone_fast() anyways. */ |
f45958756 block: remove bio... |
660 |
bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs); |
bdb532074 block: Refactor b... |
661 |
if (!bio) |
7ba1ba12e block: Block laye... |
662 |
return NULL; |
74d46992e block: replace bi... |
663 |
bio->bi_disk = bio_src->bi_disk; |
1eff9d322 block: rename bio... |
664 |
bio->bi_opf = bio_src->bi_opf; |
cb6934f8e block: add suppor... |
665 |
bio->bi_write_hint = bio_src->bi_write_hint; |
bdb532074 block: Refactor b... |
666 667 |
bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector; bio->bi_iter.bi_size = bio_src->bi_iter.bi_size; |
7ba1ba12e block: Block laye... |
668 |
|
7afafc8a4 block: Fix secure... |
669 670 671 |
switch (bio_op(bio)) { case REQ_OP_DISCARD: case REQ_OP_SECURE_ERASE: |
a6f0788ec block: add suppor... |
672 |
case REQ_OP_WRITE_ZEROES: |
7afafc8a4 block: Fix secure... |
673 674 |
break; case REQ_OP_WRITE_SAME: |
8423ae3d7 block: Fix clonin... |
675 |
bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0]; |
7afafc8a4 block: Fix secure... |
676 677 |
break; default: |
f45958756 block: remove bio... |
678 |
bio_for_each_segment(bv, bio_src, iter) |
7afafc8a4 block: Fix secure... |
679 680 |
bio->bi_io_vec[bio->bi_vcnt++] = bv; break; |
8423ae3d7 block: Fix clonin... |
681 |
} |
bdb532074 block: Refactor b... |
682 683 |
if (bio_integrity(bio_src)) { int ret; |
7ba1ba12e block: Block laye... |
684 |
|
bdb532074 block: Refactor b... |
685 |
ret = bio_integrity_clone(bio, bio_src, gfp_mask); |
059ea3318 block: fix memory... |
686 |
if (ret < 0) { |
bdb532074 block: Refactor b... |
687 |
bio_put(bio); |
7ba1ba12e block: Block laye... |
688 |
return NULL; |
059ea3318 block: fix memory... |
689 |
} |
3676347a5 [PATCH] kill bio-... |
690 |
} |
1da177e4c Linux-2.6.12-rc2 |
691 |
|
20bd723ec block: add missin... |
692 |
bio_clone_blkcg_association(bio, bio_src); |
bdb532074 block: Refactor b... |
693 |
return bio; |
1da177e4c Linux-2.6.12-rc2 |
694 |
} |
bf800ef18 block: Add bio_cl... |
695 |
EXPORT_SYMBOL(bio_clone_bioset); |
1da177e4c Linux-2.6.12-rc2 |
696 697 |
/** |
c66a14d07 block: simplify b... |
698 699 700 701 702 703 |
* bio_add_pc_page - attempt to add page to bio * @q: the target queue * @bio: destination bio * @page: page to add * @len: vec entry length * @offset: vec entry offset |
1da177e4c Linux-2.6.12-rc2 |
704 |
* |
c66a14d07 block: simplify b... |
705 706 707 708 709 710 |
* 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 up to 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. |
1da177e4c Linux-2.6.12-rc2 |
711 |
*/ |
c66a14d07 block: simplify b... |
712 713 |
int bio_add_pc_page(struct request_queue *q, struct bio *bio, struct page *page, unsigned int len, unsigned int offset) |
1da177e4c Linux-2.6.12-rc2 |
714 715 716 717 718 719 720 721 722 |
{ int retried_segments = 0; struct bio_vec *bvec; /* * cloned bio must not modify vec list */ if (unlikely(bio_flagged(bio, BIO_CLONED))) return 0; |
c66a14d07 block: simplify b... |
723 |
if (((bio->bi_iter.bi_size + len) >> 9) > queue_max_hw_sectors(q)) |
1da177e4c Linux-2.6.12-rc2 |
724 |
return 0; |
80cfd548e [BLOCK] bio: chec... |
725 726 727 728 729 730 731 732 733 734 735 |
/* * 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) { prev->bv_len += len; |
fcbf6a087 bio: modify __bio... |
736 |
bio->bi_iter.bi_size += len; |
80cfd548e [BLOCK] bio: chec... |
737 738 |
goto done; } |
66cb45aa4 block: add suppor... |
739 740 741 742 743 |
/* * If the queue doesn't support SG gaps and adding this * offset would create a gap, disallow it. */ |
03100aada block: Replace SG... |
744 |
if (bvec_gap_to_prev(q, prev, offset)) |
66cb45aa4 block: add suppor... |
745 |
return 0; |
80cfd548e [BLOCK] bio: chec... |
746 747 748 |
} if (bio->bi_vcnt >= bio->bi_max_vecs) |
1da177e4c Linux-2.6.12-rc2 |
749 750 751 |
return 0; /* |
fcbf6a087 bio: modify __bio... |
752 753 754 755 756 757 758 759 760 761 762 763 764 765 |
* 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; bio->bi_vcnt++; bio->bi_phys_segments++; bio->bi_iter.bi_size += len; /* * Perform a recount if the number of segments is greater * than queue_max_segments(q). |
1da177e4c Linux-2.6.12-rc2 |
766 |
*/ |
fcbf6a087 bio: modify __bio... |
767 |
while (bio->bi_phys_segments > queue_max_segments(q)) { |
1da177e4c Linux-2.6.12-rc2 |
768 769 |
if (retried_segments) |
fcbf6a087 bio: modify __bio... |
770 |
goto failed; |
1da177e4c Linux-2.6.12-rc2 |
771 772 773 774 |
retried_segments = 1; blk_recount_segments(q, bio); } |
1da177e4c Linux-2.6.12-rc2 |
775 |
/* If we may be able to merge these biovecs, force a recount */ |
fcbf6a087 bio: modify __bio... |
776 |
if (bio->bi_vcnt > 1 && (BIOVEC_PHYS_MERGEABLE(bvec-1, bvec))) |
b7c44ed9d block: manipulate... |
777 |
bio_clear_flag(bio, BIO_SEG_VALID); |
1da177e4c Linux-2.6.12-rc2 |
778 |
|
80cfd548e [BLOCK] bio: chec... |
779 |
done: |
1da177e4c Linux-2.6.12-rc2 |
780 |
return len; |
fcbf6a087 bio: modify __bio... |
781 782 783 784 785 786 787 788 789 |
failed: bvec->bv_page = NULL; bvec->bv_len = 0; bvec->bv_offset = 0; bio->bi_vcnt--; bio->bi_iter.bi_size -= len; blk_recount_segments(q, bio); return 0; |
1da177e4c Linux-2.6.12-rc2 |
790 |
} |
a112a71d4 fs/bio.c: move EX... |
791 |
EXPORT_SYMBOL(bio_add_pc_page); |
6e68af666 [SCSI] Convert SC... |
792 793 |
/** |
1da177e4c Linux-2.6.12-rc2 |
794 795 796 797 798 799 |
* bio_add_page - attempt to add page to bio * @bio: destination bio * @page: page to add * @len: vec entry length * @offset: vec entry offset * |
c66a14d07 block: simplify b... |
800 801 |
* Attempt to add a page to the bio_vec maplist. This will only fail * if either bio->bi_vcnt == bio->bi_max_vecs or it's a cloned bio. |
1da177e4c Linux-2.6.12-rc2 |
802 |
*/ |
c66a14d07 block: simplify b... |
803 804 |
int bio_add_page(struct bio *bio, struct page *page, unsigned int len, unsigned int offset) |
1da177e4c Linux-2.6.12-rc2 |
805 |
{ |
c66a14d07 block: simplify b... |
806 807 808 809 810 811 812 |
struct bio_vec *bv; /* * cloned bio must not modify vec list */ if (WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED))) return 0; |
762380ad9 block: add notion... |
813 |
|
c66a14d07 block: simplify b... |
814 815 816 817 818 819 820 |
/* * 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) { bv = &bio->bi_io_vec[bio->bi_vcnt - 1]; |
58a4915ad block: ensure tha... |
821 |
|
c66a14d07 block: simplify b... |
822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 |
if (page == bv->bv_page && offset == bv->bv_offset + bv->bv_len) { bv->bv_len += len; goto done; } } if (bio->bi_vcnt >= bio->bi_max_vecs) return 0; bv = &bio->bi_io_vec[bio->bi_vcnt]; bv->bv_page = page; bv->bv_len = len; bv->bv_offset = offset; bio->bi_vcnt++; done: bio->bi_iter.bi_size += len; return len; |
1da177e4c Linux-2.6.12-rc2 |
841 |
} |
a112a71d4 fs/bio.c: move EX... |
842 |
EXPORT_SYMBOL(bio_add_page); |
1da177e4c Linux-2.6.12-rc2 |
843 |
|
2cefe4dba block: add bio_io... |
844 845 846 847 848 849 850 851 852 853 |
/** * bio_iov_iter_get_pages - pin user or kernel pages and add them to a bio * @bio: bio to add pages to * @iter: iov iterator describing the region to be mapped * * Pins as many pages from *iter and appends them to @bio's bvec array. The * pages will have to be released using put_page() when done. */ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) { |
2258351cf block: bio_iov_it... |
854 |
unsigned short nr_pages = bio->bi_max_vecs - bio->bi_vcnt, idx; |
2cefe4dba block: add bio_io... |
855 856 |
struct bio_vec *bv = bio->bi_io_vec + bio->bi_vcnt; struct page **pages = (struct page **)bv; |
2258351cf block: bio_iov_it... |
857 |
size_t offset; |
2cefe4dba block: add bio_io... |
858 859 860 861 862 |
ssize_t size; size = iov_iter_get_pages(iter, pages, LONG_MAX, nr_pages, &offset); if (unlikely(size <= 0)) return size ? size : -EFAULT; |
2258351cf block: bio_iov_it... |
863 |
idx = nr_pages = (size + offset + PAGE_SIZE - 1) / PAGE_SIZE; |
2cefe4dba block: add bio_io... |
864 865 866 867 868 869 870 871 872 873 874 |
/* * Deep magic below: We need to walk the pinned pages backwards * because we are abusing the space allocated for the bio_vecs * for the page array. Because the bio_vecs are larger than the * page pointers by definition this will always work. But it also * means we can't use bio_add_page, so any changes to it's semantics * need to be reflected here as well. */ bio->bi_iter.bi_size += size; bio->bi_vcnt += nr_pages; |
2258351cf block: bio_iov_it... |
875 876 877 878 |
while (idx--) { bv[idx].bv_page = pages[idx]; bv[idx].bv_len = PAGE_SIZE; bv[idx].bv_offset = 0; |
2cefe4dba block: add bio_io... |
879 880 881 882 |
} bv[0].bv_offset += offset; bv[0].bv_len -= offset; |
2258351cf block: bio_iov_it... |
883 |
bv[nr_pages - 1].bv_len -= nr_pages * PAGE_SIZE - offset - size; |
2cefe4dba block: add bio_io... |
884 885 886 887 888 |
iov_iter_advance(iter, size); return 0; } EXPORT_SYMBOL_GPL(bio_iov_iter_get_pages); |
9e882242c block: Add submit... |
889 890 891 892 |
struct submit_bio_ret { struct completion event; int error; }; |
4246a0b63 block: add a bi_e... |
893 |
static void submit_bio_wait_endio(struct bio *bio) |
9e882242c block: Add submit... |
894 895 |
{ struct submit_bio_ret *ret = bio->bi_private; |
4e4cbee93 block: switch bio... |
896 |
ret->error = blk_status_to_errno(bio->bi_status); |
9e882242c block: Add submit... |
897 898 899 900 901 |
complete(&ret->event); } /** * submit_bio_wait - submit a bio, and wait until it completes |
9e882242c block: Add submit... |
902 903 904 905 |
* @bio: The &struct bio which describes the I/O * * Simple wrapper around submit_bio(). Returns 0 on success, or the error from * bio_endio() on failure. |
3d289d688 block: Add commen... |
906 907 908 909 |
* * WARNING: Unlike to how submit_bio() is usually used, this function does not * result in bio reference to be consumed. The caller must drop the reference * on his own. |
9e882242c block: Add submit... |
910 |
*/ |
4e49ea4a3 block/fs/drivers:... |
911 |
int submit_bio_wait(struct bio *bio) |
9e882242c block: Add submit... |
912 913 |
{ struct submit_bio_ret ret; |
9e882242c block: Add submit... |
914 915 916 |
init_completion(&ret.event); bio->bi_private = &ret; bio->bi_end_io = submit_bio_wait_endio; |
1eff9d322 block: rename bio... |
917 |
bio->bi_opf |= REQ_SYNC; |
4e49ea4a3 block/fs/drivers:... |
918 |
submit_bio(bio); |
d57d61150 kernel/fs: fix I/... |
919 |
wait_for_completion_io(&ret.event); |
9e882242c block: Add submit... |
920 921 922 923 |
return ret.error; } EXPORT_SYMBOL(submit_bio_wait); |
054bdf646 block: Add bio_ad... |
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 |
/** * bio_advance - increment/complete a bio by some number of bytes * @bio: bio to advance * @bytes: number of bytes to complete * * This updates bi_sector, bi_size and bi_idx; if the number of bytes to * complete doesn't align with a bvec boundary, then bv_len and bv_offset will * be updated on the last bvec as well. * * @bio will then represent the remaining, uncompleted portion of the io. */ void bio_advance(struct bio *bio, unsigned bytes) { if (bio_integrity(bio)) bio_integrity_advance(bio, bytes); |
4550dd6c6 block: Immutable ... |
939 |
bio_advance_iter(bio, &bio->bi_iter, bytes); |
054bdf646 block: Add bio_ad... |
940 941 |
} EXPORT_SYMBOL(bio_advance); |
16ac3d63e block: Add bio_co... |
942 |
/** |
a07876064 block: Add bio_al... |
943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 |
* bio_alloc_pages - allocates a single page for each bvec in a bio * @bio: bio to allocate pages for * @gfp_mask: flags for allocation * * Allocates pages up to @bio->bi_vcnt. * * Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are * freed. */ int bio_alloc_pages(struct bio *bio, gfp_t gfp_mask) { int i; struct bio_vec *bv; bio_for_each_segment_all(bv, bio, i) { bv->bv_page = alloc_page(gfp_mask); if (!bv->bv_page) { while (--bv >= bio->bi_io_vec) __free_page(bv->bv_page); return -ENOMEM; } } return 0; } EXPORT_SYMBOL(bio_alloc_pages); /** |
16ac3d63e block: Add bio_co... |
971 972 973 974 975 976 977 978 979 980 981 982 983 |
* bio_copy_data - copy contents of data buffers from one chain of bios to * another * @src: source bio list * @dst: destination bio list * * If @src and @dst are single bios, bi_next must be NULL - otherwise, treats * @src and @dst as linked lists of bios. * * Stops when it reaches the end of either @src or @dst - that is, copies * min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of bios). */ void bio_copy_data(struct bio *dst, struct bio *src) { |
1cb9dda4f block: Convert bi... |
984 985 |
struct bvec_iter src_iter, dst_iter; struct bio_vec src_bv, dst_bv; |
16ac3d63e block: Add bio_co... |
986 |
void *src_p, *dst_p; |
1cb9dda4f block: Convert bi... |
987 |
unsigned bytes; |
16ac3d63e block: Add bio_co... |
988 |
|
1cb9dda4f block: Convert bi... |
989 990 |
src_iter = src->bi_iter; dst_iter = dst->bi_iter; |
16ac3d63e block: Add bio_co... |
991 992 |
while (1) { |
1cb9dda4f block: Convert bi... |
993 994 995 996 |
if (!src_iter.bi_size) { src = src->bi_next; if (!src) break; |
16ac3d63e block: Add bio_co... |
997 |
|
1cb9dda4f block: Convert bi... |
998 |
src_iter = src->bi_iter; |
16ac3d63e block: Add bio_co... |
999 |
} |
1cb9dda4f block: Convert bi... |
1000 1001 1002 1003 |
if (!dst_iter.bi_size) { dst = dst->bi_next; if (!dst) break; |
16ac3d63e block: Add bio_co... |
1004 |
|
1cb9dda4f block: Convert bi... |
1005 |
dst_iter = dst->bi_iter; |
16ac3d63e block: Add bio_co... |
1006 |
} |
1cb9dda4f block: Convert bi... |
1007 1008 1009 1010 |
src_bv = bio_iter_iovec(src, src_iter); dst_bv = bio_iter_iovec(dst, dst_iter); bytes = min(src_bv.bv_len, dst_bv.bv_len); |
16ac3d63e block: Add bio_co... |
1011 |
|
1cb9dda4f block: Convert bi... |
1012 1013 |
src_p = kmap_atomic(src_bv.bv_page); dst_p = kmap_atomic(dst_bv.bv_page); |
16ac3d63e block: Add bio_co... |
1014 |
|
1cb9dda4f block: Convert bi... |
1015 1016 |
memcpy(dst_p + dst_bv.bv_offset, src_p + src_bv.bv_offset, |
16ac3d63e block: Add bio_co... |
1017 1018 1019 1020 |
bytes); kunmap_atomic(dst_p); kunmap_atomic(src_p); |
1cb9dda4f block: Convert bi... |
1021 1022 |
bio_advance_iter(src, &src_iter, bytes); bio_advance_iter(dst, &dst_iter, bytes); |
16ac3d63e block: Add bio_co... |
1023 1024 1025 |
} } EXPORT_SYMBOL(bio_copy_data); |
1da177e4c Linux-2.6.12-rc2 |
1026 |
struct bio_map_data { |
152e283fd block: introduce ... |
1027 |
int is_our_pages; |
26e49cfc7 block: pass iov_i... |
1028 1029 |
struct iov_iter iter; struct iovec iov[]; |
1da177e4c Linux-2.6.12-rc2 |
1030 |
}; |
7410b3c6c fs/bio.c: remove ... |
1031 |
static struct bio_map_data *bio_alloc_map_data(unsigned int iov_count, |
76029ff37 bio: fix bio_copy... |
1032 |
gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1033 |
{ |
f3f63c1c2 block: limit vec ... |
1034 1035 |
if (iov_count > UIO_MAXIOV) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1036 |
|
c8db44482 block: Don't save... |
1037 |
return kmalloc(sizeof(struct bio_map_data) + |
26e49cfc7 block: pass iov_i... |
1038 |
sizeof(struct iovec) * iov_count, gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
1039 |
} |
9124d3fe2 block: rewrite an... |
1040 1041 1042 1043 1044 1045 1046 1047 1048 |
/** * bio_copy_from_iter - copy all pages from iov_iter to bio * @bio: The &struct bio which describes the I/O as destination * @iter: iov_iter as source * * Copy all pages from iov_iter to bio. * Returns 0 on success, or error on failure. */ static int bio_copy_from_iter(struct bio *bio, struct iov_iter iter) |
c5dec1c30 block: convert bi... |
1049 |
{ |
9124d3fe2 block: rewrite an... |
1050 |
int i; |
c5dec1c30 block: convert bi... |
1051 |
struct bio_vec *bvec; |
c5dec1c30 block: convert bi... |
1052 |
|
d74c6d514 block: Add bio_fo... |
1053 |
bio_for_each_segment_all(bvec, bio, i) { |
9124d3fe2 block: rewrite an... |
1054 |
ssize_t ret; |
c5dec1c30 block: convert bi... |
1055 |
|
9124d3fe2 block: rewrite an... |
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 |
ret = copy_page_from_iter(bvec->bv_page, bvec->bv_offset, bvec->bv_len, &iter); if (!iov_iter_count(&iter)) break; if (ret < bvec->bv_len) return -EFAULT; |
c5dec1c30 block: convert bi... |
1066 |
} |
9124d3fe2 block: rewrite an... |
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 1095 1096 1097 1098 |
return 0; } /** * bio_copy_to_iter - copy all pages from bio to iov_iter * @bio: The &struct bio which describes the I/O as source * @iter: iov_iter as destination * * Copy all pages from bio to iov_iter. * Returns 0 on success, or error on failure. */ static int bio_copy_to_iter(struct bio *bio, struct iov_iter iter) { int i; struct bio_vec *bvec; bio_for_each_segment_all(bvec, bio, i) { ssize_t ret; ret = copy_page_to_iter(bvec->bv_page, bvec->bv_offset, bvec->bv_len, &iter); if (!iov_iter_count(&iter)) break; if (ret < bvec->bv_len) return -EFAULT; } return 0; |
c5dec1c30 block: convert bi... |
1099 |
} |
491221f88 block: export bio... |
1100 |
void bio_free_pages(struct bio *bio) |
1dfa0f68c block: add a help... |
1101 1102 1103 1104 1105 1106 1107 |
{ struct bio_vec *bvec; int i; bio_for_each_segment_all(bvec, bio, i) __free_page(bvec->bv_page); } |
491221f88 block: export bio... |
1108 |
EXPORT_SYMBOL(bio_free_pages); |
1dfa0f68c block: add a help... |
1109 |
|
1da177e4c Linux-2.6.12-rc2 |
1110 1111 1112 1113 |
/** * bio_uncopy_user - finish previously mapped bio * @bio: bio being terminated * |
ddad8dd0a block: use blk_rq... |
1114 |
* Free pages allocated from bio_copy_user_iov() and write back data |
1da177e4c Linux-2.6.12-rc2 |
1115 1116 1117 1118 1119 |
* to user space in case of a read. */ int bio_uncopy_user(struct bio *bio) { struct bio_map_data *bmd = bio->bi_private; |
1dfa0f68c block: add a help... |
1120 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1121 |
|
35dc24838 [SCSI] sg: Fix us... |
1122 1123 1124 |
if (!bio_flagged(bio, BIO_NULL_MAPPED)) { /* * if we're in a workqueue, the request is orphaned, so |
2d99b55d3 bio: return EINTR... |
1125 1126 |
* don't copy into a random user address space, just free * and return -EINTR so user space doesn't expect any data. |
35dc24838 [SCSI] sg: Fix us... |
1127 |
*/ |
2d99b55d3 bio: return EINTR... |
1128 1129 1130 |
if (!current->mm) ret = -EINTR; else if (bio_data_dir(bio) == READ) |
9124d3fe2 block: rewrite an... |
1131 |
ret = bio_copy_to_iter(bio, bmd->iter); |
1dfa0f68c block: add a help... |
1132 1133 |
if (bmd->is_our_pages) bio_free_pages(bio); |
35dc24838 [SCSI] sg: Fix us... |
1134 |
} |
c8db44482 block: Don't save... |
1135 |
kfree(bmd); |
1da177e4c Linux-2.6.12-rc2 |
1136 1137 1138 1139 1140 |
bio_put(bio); return ret; } /** |
c5dec1c30 block: convert bi... |
1141 |
* bio_copy_user_iov - copy user data to bio |
26e49cfc7 block: pass iov_i... |
1142 1143 1144 1145 |
* @q: destination block queue * @map_data: pointer to the rq_map_data holding pages (if necessary) * @iter: iovec iterator * @gfp_mask: memory allocation flags |
1da177e4c Linux-2.6.12-rc2 |
1146 1147 1148 1149 1150 |
* * 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 ... |
1151 1152 |
struct bio *bio_copy_user_iov(struct request_queue *q, struct rq_map_data *map_data, |
26e49cfc7 block: pass iov_i... |
1153 1154 |
const struct iov_iter *iter, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1155 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1156 |
struct bio_map_data *bmd; |
1da177e4c Linux-2.6.12-rc2 |
1157 1158 1159 |
struct page *page; struct bio *bio; int i, ret; |
c5dec1c30 block: convert bi... |
1160 |
int nr_pages = 0; |
26e49cfc7 block: pass iov_i... |
1161 |
unsigned int len = iter->count; |
bd5cecea4 bio: use offset_i... |
1162 |
unsigned int offset = map_data ? offset_in_page(map_data->offset) : 0; |
1da177e4c Linux-2.6.12-rc2 |
1163 |
|
26e49cfc7 block: pass iov_i... |
1164 |
for (i = 0; i < iter->nr_segs; i++) { |
c5dec1c30 block: convert bi... |
1165 1166 1167 |
unsigned long uaddr; unsigned long end; unsigned long start; |
26e49cfc7 block: pass iov_i... |
1168 1169 1170 |
uaddr = (unsigned long) iter->iov[i].iov_base; end = (uaddr + iter->iov[i].iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
c5dec1c30 block: convert bi... |
1171 |
start = uaddr >> PAGE_SHIFT; |
cb4644cac bio: take care no... |
1172 1173 1174 1175 1176 |
/* * Overflow, abort */ if (end < start) return ERR_PTR(-EINVAL); |
c5dec1c30 block: convert bi... |
1177 |
nr_pages += end - start; |
c5dec1c30 block: convert bi... |
1178 |
} |
69838727b bio: fix memcpy c... |
1179 1180 |
if (offset) nr_pages++; |
26e49cfc7 block: pass iov_i... |
1181 |
bmd = bio_alloc_map_data(iter->nr_segs, gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
1182 1183 |
if (!bmd) return ERR_PTR(-ENOMEM); |
26e49cfc7 block: pass iov_i... |
1184 1185 1186 1187 1188 1189 1190 |
/* * We need to do a deep copy of the iov_iter including the iovecs. * The caller provided iov might point to an on-stack or otherwise * shortlived one. */ bmd->is_our_pages = map_data ? 0 : 1; memcpy(bmd->iov, iter->iov, sizeof(struct iovec) * iter->nr_segs); |
1cfd0ddd8 bio_copy_user_iov... |
1191 1192 |
bmd->iter = *iter; bmd->iter.iov = bmd->iov; |
26e49cfc7 block: pass iov_i... |
1193 |
|
1da177e4c Linux-2.6.12-rc2 |
1194 |
ret = -ENOMEM; |
a9e9dc24b bio: use bio_kmal... |
1195 |
bio = bio_kmalloc(gfp_mask, nr_pages); |
1da177e4c Linux-2.6.12-rc2 |
1196 1197 |
if (!bio) goto out_bmd; |
1da177e4c Linux-2.6.12-rc2 |
1198 |
ret = 0; |
56c451f4b [SCSI] block: fix... |
1199 1200 |
if (map_data) { |
e623ddb4e [SCSI] block: fix... |
1201 |
nr_pages = 1 << map_data->page_order; |
56c451f4b [SCSI] block: fix... |
1202 1203 |
i = map_data->offset / PAGE_SIZE; } |
1da177e4c Linux-2.6.12-rc2 |
1204 |
while (len) { |
e623ddb4e [SCSI] block: fix... |
1205 |
unsigned int bytes = PAGE_SIZE; |
1da177e4c Linux-2.6.12-rc2 |
1206 |
|
56c451f4b [SCSI] block: fix... |
1207 |
bytes -= offset; |
1da177e4c Linux-2.6.12-rc2 |
1208 1209 |
if (bytes > len) bytes = len; |
152e283fd block: introduce ... |
1210 |
if (map_data) { |
e623ddb4e [SCSI] block: fix... |
1211 |
if (i == map_data->nr_entries * nr_pages) { |
152e283fd block: introduce ... |
1212 1213 1214 |
ret = -ENOMEM; break; } |
e623ddb4e [SCSI] block: fix... |
1215 1216 1217 1218 1219 1220 |
page = map_data->pages[i / nr_pages]; page += (i % nr_pages); i++; } else { |
152e283fd block: introduce ... |
1221 |
page = alloc_page(q->bounce_gfp | gfp_mask); |
e623ddb4e [SCSI] block: fix... |
1222 1223 1224 1225 |
if (!page) { ret = -ENOMEM; break; } |
1da177e4c Linux-2.6.12-rc2 |
1226 |
} |
56c451f4b [SCSI] block: fix... |
1227 |
if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes) |
1da177e4c Linux-2.6.12-rc2 |
1228 |
break; |
1da177e4c Linux-2.6.12-rc2 |
1229 1230 |
len -= bytes; |
56c451f4b [SCSI] block: fix... |
1231 |
offset = 0; |
1da177e4c Linux-2.6.12-rc2 |
1232 1233 1234 1235 1236 1237 1238 1239 |
} if (ret) goto cleanup; /* * success */ |
26e49cfc7 block: pass iov_i... |
1240 |
if (((iter->type & WRITE) && (!map_data || !map_data->null_mapped)) || |
ecb554a84 block: fix sg SG_... |
1241 |
(map_data && map_data->from_user)) { |
9124d3fe2 block: rewrite an... |
1242 |
ret = bio_copy_from_iter(bio, *iter); |
c5dec1c30 block: convert bi... |
1243 1244 |
if (ret) goto cleanup; |
1da177e4c Linux-2.6.12-rc2 |
1245 |
} |
26e49cfc7 block: pass iov_i... |
1246 |
bio->bi_private = bmd; |
1da177e4c Linux-2.6.12-rc2 |
1247 1248 |
return bio; cleanup: |
152e283fd block: introduce ... |
1249 |
if (!map_data) |
1dfa0f68c block: add a help... |
1250 |
bio_free_pages(bio); |
1da177e4c Linux-2.6.12-rc2 |
1251 1252 |
bio_put(bio); out_bmd: |
c8db44482 block: Don't save... |
1253 |
kfree(bmd); |
1da177e4c Linux-2.6.12-rc2 |
1254 1255 |
return ERR_PTR(ret); } |
37f19e57a block: merge __bi... |
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 |
/** * bio_map_user_iov - map user iovec into bio * @q: the struct request_queue for the bio * @iter: iovec iterator * @gfp_mask: memory allocation flags * * Map the user space address into a bio suitable for io to a block * device. Returns an error pointer in case of error. */ struct bio *bio_map_user_iov(struct request_queue *q, const struct iov_iter *iter, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1268 |
{ |
26e49cfc7 block: pass iov_i... |
1269 |
int j; |
f1970baf6 [PATCH] Add scatt... |
1270 |
int nr_pages = 0; |
1da177e4c Linux-2.6.12-rc2 |
1271 1272 |
struct page **pages; struct bio *bio; |
f1970baf6 [PATCH] Add scatt... |
1273 1274 |
int cur_page = 0; int ret, offset; |
26e49cfc7 block: pass iov_i... |
1275 1276 |
struct iov_iter i; struct iovec iov; |
2b04e8f6b more bio_map_user... |
1277 |
struct bio_vec *bvec; |
1da177e4c Linux-2.6.12-rc2 |
1278 |
|
26e49cfc7 block: pass iov_i... |
1279 1280 1281 |
iov_for_each(iov, i, *iter) { unsigned long uaddr = (unsigned long) iov.iov_base; unsigned long len = iov.iov_len; |
f1970baf6 [PATCH] Add scatt... |
1282 1283 |
unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT; unsigned long start = uaddr >> PAGE_SHIFT; |
cb4644cac bio: take care no... |
1284 1285 1286 1287 1288 |
/* * Overflow, abort */ if (end < start) return ERR_PTR(-EINVAL); |
f1970baf6 [PATCH] Add scatt... |
1289 1290 |
nr_pages += end - start; /* |
a441b0d09 block: remove rem... |
1291 |
* buffer must be aligned to at least logical block size for now |
f1970baf6 [PATCH] Add scatt... |
1292 |
*/ |
ad2d72257 [PATCH] block: ki... |
1293 |
if (uaddr & queue_dma_alignment(q)) |
f1970baf6 [PATCH] Add scatt... |
1294 1295 1296 1297 |
return ERR_PTR(-EINVAL); } if (!nr_pages) |
1da177e4c Linux-2.6.12-rc2 |
1298 |
return ERR_PTR(-EINVAL); |
a9e9dc24b bio: use bio_kmal... |
1299 |
bio = bio_kmalloc(gfp_mask, nr_pages); |
1da177e4c Linux-2.6.12-rc2 |
1300 1301 1302 1303 |
if (!bio) return ERR_PTR(-ENOMEM); ret = -ENOMEM; |
a3bce90ed block: add gfp_ma... |
1304 |
pages = kcalloc(nr_pages, sizeof(struct page *), gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
1305 1306 |
if (!pages) goto out; |
26e49cfc7 block: pass iov_i... |
1307 1308 1309 |
iov_for_each(iov, i, *iter) { unsigned long uaddr = (unsigned long) iov.iov_base; unsigned long len = iov.iov_len; |
f1970baf6 [PATCH] Add scatt... |
1310 1311 1312 1313 |
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; |
cb4644cac bio: take care no... |
1314 |
|
f5dd33c49 dio: use get_user... |
1315 |
ret = get_user_pages_fast(uaddr, local_nr_pages, |
26e49cfc7 block: pass iov_i... |
1316 1317 |
(iter->type & WRITE) != WRITE, &pages[cur_page]); |
2b04e8f6b more bio_map_user... |
1318 1319 1320 1321 1322 1323 |
if (unlikely(ret < local_nr_pages)) { for (j = cur_page; j < page_limit; j++) { if (!pages[j]) break; put_page(pages[j]); } |
991721572 [PATCH] Fix missi... |
1324 |
ret = -EFAULT; |
f1970baf6 [PATCH] Add scatt... |
1325 |
goto out_unmap; |
991721572 [PATCH] Fix missi... |
1326 |
} |
f1970baf6 [PATCH] Add scatt... |
1327 |
|
bd5cecea4 bio: use offset_i... |
1328 |
offset = offset_in_page(uaddr); |
f1970baf6 [PATCH] Add scatt... |
1329 1330 |
for (j = cur_page; j < page_limit; j++) { unsigned int bytes = PAGE_SIZE - offset; |
95d78c28b fix unbalanced pa... |
1331 |
unsigned short prev_bi_vcnt = bio->bi_vcnt; |
f1970baf6 [PATCH] Add scatt... |
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 |
if (len <= 0) break; if (bytes > len) bytes = len; /* * sorry... */ |
defd94b75 [SCSI] seperate m... |
1342 1343 |
if (bio_add_pc_page(q, bio, pages[j], bytes, offset) < bytes) |
f1970baf6 [PATCH] Add scatt... |
1344 |
break; |
95d78c28b fix unbalanced pa... |
1345 1346 1347 1348 1349 1350 |
/* * check if vector was merged with previous * drop page reference if needed */ if (bio->bi_vcnt == prev_bi_vcnt) put_page(pages[j]); |
f1970baf6 [PATCH] Add scatt... |
1351 1352 1353 |
len -= bytes; offset = 0; } |
1da177e4c Linux-2.6.12-rc2 |
1354 |
|
f1970baf6 [PATCH] Add scatt... |
1355 |
cur_page = j; |
1da177e4c Linux-2.6.12-rc2 |
1356 |
/* |
f1970baf6 [PATCH] Add scatt... |
1357 |
* release the pages we didn't map into the bio, if any |
1da177e4c Linux-2.6.12-rc2 |
1358 |
*/ |
f1970baf6 [PATCH] Add scatt... |
1359 |
while (j < page_limit) |
09cbfeaf1 mm, fs: get rid o... |
1360 |
put_page(pages[j++]); |
1da177e4c Linux-2.6.12-rc2 |
1361 |
} |
1da177e4c Linux-2.6.12-rc2 |
1362 |
kfree(pages); |
b7c44ed9d block: manipulate... |
1363 |
bio_set_flag(bio, BIO_USER_MAPPED); |
37f19e57a block: merge __bi... |
1364 1365 |
/* |
5fad1b64a block: Update com... |
1366 |
* subtle -- if bio_map_user_iov() ended up bouncing a bio, |
37f19e57a block: merge __bi... |
1367 1368 1369 1370 1371 |
* 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); |
1da177e4c Linux-2.6.12-rc2 |
1372 |
return bio; |
f1970baf6 [PATCH] Add scatt... |
1373 1374 |
out_unmap: |
2b04e8f6b more bio_map_user... |
1375 1376 |
bio_for_each_segment_all(bvec, bio, j) { put_page(bvec->bv_page); |
f1970baf6 [PATCH] Add scatt... |
1377 1378 |
} out: |
1da177e4c Linux-2.6.12-rc2 |
1379 1380 1381 1382 |
kfree(pages); bio_put(bio); return ERR_PTR(ret); } |
1da177e4c Linux-2.6.12-rc2 |
1383 1384 1385 1386 1387 1388 1389 1390 |
static void __bio_unmap_user(struct bio *bio) { struct bio_vec *bvec; int i; /* * make sure we dirty pages we wrote to */ |
d74c6d514 block: Add bio_fo... |
1391 |
bio_for_each_segment_all(bvec, bio, i) { |
1da177e4c Linux-2.6.12-rc2 |
1392 1393 |
if (bio_data_dir(bio) == READ) set_page_dirty_lock(bvec->bv_page); |
09cbfeaf1 mm, fs: get rid o... |
1394 |
put_page(bvec->bv_page); |
1da177e4c Linux-2.6.12-rc2 |
1395 1396 1397 1398 1399 1400 1401 1402 1403 |
} bio_put(bio); } /** * bio_unmap_user - unmap a bio * @bio: the bio being unmapped * |
5fad1b64a block: Update com... |
1404 1405 |
* Unmap a bio previously mapped by bio_map_user_iov(). Must be called from * process context. |
1da177e4c Linux-2.6.12-rc2 |
1406 1407 1408 1409 1410 1411 1412 1413 |
* * bio_unmap_user() may sleep. */ void bio_unmap_user(struct bio *bio) { __bio_unmap_user(bio); bio_put(bio); } |
4246a0b63 block: add a bi_e... |
1414 |
static void bio_map_kern_endio(struct bio *bio) |
b823825e8 [PATCH] Keep the ... |
1415 |
{ |
b823825e8 [PATCH] Keep the ... |
1416 |
bio_put(bio); |
b823825e8 [PATCH] Keep the ... |
1417 |
} |
75c72b836 block: merge __bi... |
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 |
/** * bio_map_kern - map kernel address into bio * @q: the struct request_queue for the bio * @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. */ struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, gfp_t gfp_mask) |
df46b9a44 [PATCH] Add blk_r... |
1430 1431 1432 1433 1434 1435 1436 |
{ 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... |
1437 |
bio = bio_kmalloc(gfp_mask, nr_pages); |
df46b9a44 [PATCH] Add blk_r... |
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 |
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... |
1450 |
if (bio_add_pc_page(q, bio, virt_to_page(data), bytes, |
75c72b836 block: merge __bi... |
1451 1452 1453 1454 1455 |
offset) < bytes) { /* we don't support partial mappings */ bio_put(bio); return ERR_PTR(-EINVAL); } |
df46b9a44 [PATCH] Add blk_r... |
1456 1457 1458 1459 1460 |
data += bytes; len -= bytes; offset = 0; } |
b823825e8 [PATCH] Keep the ... |
1461 |
bio->bi_end_io = bio_map_kern_endio; |
df46b9a44 [PATCH] Add blk_r... |
1462 1463 |
return bio; } |
a112a71d4 fs/bio.c: move EX... |
1464 |
EXPORT_SYMBOL(bio_map_kern); |
df46b9a44 [PATCH] Add blk_r... |
1465 |
|
4246a0b63 block: add a bi_e... |
1466 |
static void bio_copy_kern_endio(struct bio *bio) |
68154e90c block: add dma al... |
1467 |
{ |
1dfa0f68c block: add a help... |
1468 1469 1470 |
bio_free_pages(bio); bio_put(bio); } |
4246a0b63 block: add a bi_e... |
1471 |
static void bio_copy_kern_endio_read(struct bio *bio) |
1dfa0f68c block: add a help... |
1472 |
{ |
42d2683a2 block: simplify b... |
1473 |
char *p = bio->bi_private; |
1dfa0f68c block: add a help... |
1474 |
struct bio_vec *bvec; |
68154e90c block: add dma al... |
1475 |
int i; |
d74c6d514 block: Add bio_fo... |
1476 |
bio_for_each_segment_all(bvec, bio, i) { |
1dfa0f68c block: add a help... |
1477 |
memcpy(p, page_address(bvec->bv_page), bvec->bv_len); |
c8db44482 block: Don't save... |
1478 |
p += bvec->bv_len; |
68154e90c block: add dma al... |
1479 |
} |
4246a0b63 block: add a bi_e... |
1480 |
bio_copy_kern_endio(bio); |
68154e90c block: add dma al... |
1481 1482 1483 1484 1485 1486 1487 1488 |
} /** * 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 ... |
1489 |
* @reading: data direction is READ |
68154e90c block: add dma al... |
1490 1491 1492 1493 1494 1495 1496 |
* * 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) { |
42d2683a2 block: simplify b... |
1497 1498 1499 |
unsigned long kaddr = (unsigned long)data; unsigned long end = (kaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT; unsigned long start = kaddr >> PAGE_SHIFT; |
42d2683a2 block: simplify b... |
1500 1501 |
struct bio *bio; void *p = data; |
1dfa0f68c block: add a help... |
1502 |
int nr_pages = 0; |
68154e90c block: add dma al... |
1503 |
|
42d2683a2 block: simplify b... |
1504 1505 1506 1507 1508 |
/* * Overflow, abort */ if (end < start) return ERR_PTR(-EINVAL); |
68154e90c block: add dma al... |
1509 |
|
42d2683a2 block: simplify b... |
1510 1511 1512 1513 |
nr_pages = end - start; bio = bio_kmalloc(gfp_mask, nr_pages); if (!bio) return ERR_PTR(-ENOMEM); |
68154e90c block: add dma al... |
1514 |
|
42d2683a2 block: simplify b... |
1515 1516 1517 |
while (len) { struct page *page; unsigned int bytes = PAGE_SIZE; |
68154e90c block: add dma al... |
1518 |
|
42d2683a2 block: simplify b... |
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 |
if (bytes > len) bytes = len; page = alloc_page(q->bounce_gfp | gfp_mask); if (!page) goto cleanup; if (!reading) memcpy(page_address(page), p, bytes); if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes) break; len -= bytes; p += bytes; |
68154e90c block: add dma al... |
1534 |
} |
1dfa0f68c block: add a help... |
1535 1536 1537 1538 1539 |
if (reading) { bio->bi_end_io = bio_copy_kern_endio_read; bio->bi_private = data; } else { bio->bi_end_io = bio_copy_kern_endio; |
1dfa0f68c block: add a help... |
1540 |
} |
76029ff37 bio: fix bio_copy... |
1541 |
|
68154e90c block: add dma al... |
1542 |
return bio; |
42d2683a2 block: simplify b... |
1543 1544 |
cleanup: |
1dfa0f68c block: add a help... |
1545 |
bio_free_pages(bio); |
42d2683a2 block: simplify b... |
1546 1547 |
bio_put(bio); return ERR_PTR(-ENOMEM); |
68154e90c block: add dma al... |
1548 |
} |
1da177e4c Linux-2.6.12-rc2 |
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 |
/* * 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. |
0d5c3eba2 vfs: nuke pdflush... |
1568 |
* But other code (eg, flusher threads) could clean the pages if they are mapped |
1da177e4c Linux-2.6.12-rc2 |
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 |
* 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) { |
cb34e057a block: Convert so... |
1580 |
struct bio_vec *bvec; |
1da177e4c Linux-2.6.12-rc2 |
1581 |
int i; |
cb34e057a block: Convert so... |
1582 1583 |
bio_for_each_segment_all(bvec, bio, i) { struct page *page = bvec->bv_page; |
1da177e4c Linux-2.6.12-rc2 |
1584 1585 1586 1587 1588 |
if (page && !PageCompound(page)) set_page_dirty_lock(page); } } |
86b6c7a7f fs/block_dev.c: r... |
1589 |
static void bio_release_pages(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1590 |
{ |
cb34e057a block: Convert so... |
1591 |
struct bio_vec *bvec; |
1da177e4c Linux-2.6.12-rc2 |
1592 |
int i; |
cb34e057a block: Convert so... |
1593 1594 |
bio_for_each_segment_all(bvec, bio, i) { struct page *page = bvec->bv_page; |
1da177e4c Linux-2.6.12-rc2 |
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 |
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 |
ea1754a08 mm, fs: remove re... |
1608 1609 |
* here on. It will run one put_page() against each page and will run one * bio_put() against the BIO. |
1da177e4c Linux-2.6.12-rc2 |
1610 |
*/ |
65f27f384 WorkStruct: Pass ... |
1611 |
static void bio_dirty_fn(struct work_struct *work); |
1da177e4c Linux-2.6.12-rc2 |
1612 |
|
65f27f384 WorkStruct: Pass ... |
1613 |
static DECLARE_WORK(bio_dirty_work, bio_dirty_fn); |
1da177e4c Linux-2.6.12-rc2 |
1614 1615 1616 1617 1618 1619 |
static DEFINE_SPINLOCK(bio_dirty_lock); static struct bio *bio_dirty_list; /* * This runs in process context */ |
65f27f384 WorkStruct: Pass ... |
1620 |
static void bio_dirty_fn(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 |
{ 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) { |
cb34e057a block: Convert so... |
1642 |
struct bio_vec *bvec; |
1da177e4c Linux-2.6.12-rc2 |
1643 1644 |
int nr_clean_pages = 0; int i; |
cb34e057a block: Convert so... |
1645 1646 |
bio_for_each_segment_all(bvec, bio, i) { struct page *page = bvec->bv_page; |
1da177e4c Linux-2.6.12-rc2 |
1647 1648 |
if (PageDirty(page) || PageCompound(page)) { |
09cbfeaf1 mm, fs: get rid o... |
1649 |
put_page(page); |
cb34e057a block: Convert so... |
1650 |
bvec->bv_page = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 |
} 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); } } |
d62e26b3f block: pass in qu... |
1668 1669 |
void generic_start_io_acct(struct request_queue *q, int rw, unsigned long sectors, struct hd_struct *part) |
394ffa503 blk: introduce ge... |
1670 1671 |
{ int cpu = part_stat_lock(); |
d62e26b3f block: pass in qu... |
1672 |
part_round_stats(q, cpu, part); |
394ffa503 blk: introduce ge... |
1673 1674 |
part_stat_inc(cpu, part, ios[rw]); part_stat_add(cpu, part, sectors[rw], sectors); |
d62e26b3f block: pass in qu... |
1675 |
part_inc_in_flight(q, part, rw); |
394ffa503 blk: introduce ge... |
1676 1677 1678 1679 |
part_stat_unlock(); } EXPORT_SYMBOL(generic_start_io_acct); |
d62e26b3f block: pass in qu... |
1680 1681 |
void generic_end_io_acct(struct request_queue *q, int rw, struct hd_struct *part, unsigned long start_time) |
394ffa503 blk: introduce ge... |
1682 1683 1684 1685 1686 |
{ unsigned long duration = jiffies - start_time; int cpu = part_stat_lock(); part_stat_add(cpu, part, ticks[rw], duration); |
d62e26b3f block: pass in qu... |
1687 1688 |
part_round_stats(q, cpu, part); part_dec_in_flight(q, part, rw); |
394ffa503 blk: introduce ge... |
1689 1690 1691 1692 |
part_stat_unlock(); } EXPORT_SYMBOL(generic_end_io_acct); |
2d4dc890b block: add helper... |
1693 1694 1695 |
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE void bio_flush_dcache_pages(struct bio *bi) { |
7988613b0 block: Convert bi... |
1696 1697 |
struct bio_vec bvec; struct bvec_iter iter; |
2d4dc890b block: add helper... |
1698 |
|
7988613b0 block: Convert bi... |
1699 1700 |
bio_for_each_segment(bvec, bi, iter) flush_dcache_page(bvec.bv_page); |
2d4dc890b block: add helper... |
1701 1702 1703 |
} EXPORT_SYMBOL(bio_flush_dcache_pages); #endif |
c4cf5261f bio: skip atomic ... |
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 |
static inline bool bio_remaining_done(struct bio *bio) { /* * If we're not chaining, then ->__bi_remaining is always 1 and * we always end io on the first invocation. */ if (!bio_flagged(bio, BIO_CHAIN)) return true; BUG_ON(atomic_read(&bio->__bi_remaining) <= 0); |
326e1dbb5 block: remove man... |
1714 |
if (atomic_dec_and_test(&bio->__bi_remaining)) { |
b7c44ed9d block: manipulate... |
1715 |
bio_clear_flag(bio, BIO_CHAIN); |
c4cf5261f bio: skip atomic ... |
1716 |
return true; |
326e1dbb5 block: remove man... |
1717 |
} |
c4cf5261f bio: skip atomic ... |
1718 1719 1720 |
return false; } |
1da177e4c Linux-2.6.12-rc2 |
1721 1722 1723 |
/** * bio_endio - end I/O on a bio * @bio: bio |
1da177e4c Linux-2.6.12-rc2 |
1724 1725 |
* * Description: |
4246a0b63 block: add a bi_e... |
1726 1727 1728 |
* bio_endio() will end I/O on the whole bio. bio_endio() is the preferred * way to end I/O on a bio. No one should call bi_end_io() directly on a * bio unless they own it and thus know that it has an end_io function. |
fbbaf700e block: trace comp... |
1729 1730 1731 1732 1733 |
* * bio_endio() can be called several times on a bio that has been chained * using bio_chain(). The ->bi_end_io() function will only be called the * last time. At this point the BLK_TA_COMPLETE tracing event will be * generated if BIO_TRACE_COMPLETION is set. |
1da177e4c Linux-2.6.12-rc2 |
1734 |
**/ |
4246a0b63 block: add a bi_e... |
1735 |
void bio_endio(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1736 |
{ |
ba8c6967b block: cleanup bi... |
1737 |
again: |
2b8855171 block: bio_remain... |
1738 |
if (!bio_remaining_done(bio)) |
ba8c6967b block: cleanup bi... |
1739 |
return; |
7c20f1168 bio-integrity: st... |
1740 1741 |
if (!bio_integrity_endio(bio)) return; |
1da177e4c Linux-2.6.12-rc2 |
1742 |
|
ba8c6967b block: cleanup bi... |
1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 |
/* * Need to have a real endio function for chained bios, otherwise * various corner cases will break (like stacking block devices that * save/restore bi_end_io) - however, we want to avoid unbounded * recursion and blowing the stack. Tail call optimization would * handle this, but compiling with frame pointers also disables * gcc's sibling call optimization. */ if (bio->bi_end_io == bio_chain_endio) { bio = __bio_chain_endio(bio); goto again; |
196d38bcc block: Generic bi... |
1754 |
} |
ba8c6967b block: cleanup bi... |
1755 |
|
74d46992e block: replace bi... |
1756 1757 |
if (bio->bi_disk && bio_flagged(bio, BIO_TRACE_COMPLETION)) { trace_block_bio_complete(bio->bi_disk->queue, bio, |
a462b9508 block: Dedicated ... |
1758 |
blk_status_to_errno(bio->bi_status)); |
fbbaf700e block: trace comp... |
1759 1760 |
bio_clear_flag(bio, BIO_TRACE_COMPLETION); } |
9e234eeaf blk-throttle: add... |
1761 |
blk_throtl_bio_endio(bio); |
b222dd2fd block: call bio_u... |
1762 1763 |
/* release cgroup info */ bio_uninit(bio); |
ba8c6967b block: cleanup bi... |
1764 1765 |
if (bio->bi_end_io) bio->bi_end_io(bio); |
1da177e4c Linux-2.6.12-rc2 |
1766 |
} |
a112a71d4 fs/bio.c: move EX... |
1767 |
EXPORT_SYMBOL(bio_endio); |
1da177e4c Linux-2.6.12-rc2 |
1768 |
|
196d38bcc block: Generic bi... |
1769 |
/** |
20d0189b1 block: Introduce ... |
1770 1771 1772 1773 1774 1775 1776 1777 1778 |
* bio_split - split a bio * @bio: bio to split * @sectors: number of sectors to split from the front of @bio * @gfp: gfp mask * @bs: bio set to allocate from * * Allocates and returns a new bio which represents @sectors from the start of * @bio, and updates @bio to represent the remaining sectors. * |
f3f5da624 block: Do a full ... |
1779 1780 1781 |
* Unless this is a discard request the newly allocated bio will point * to @bio's bi_io_vec; it is the caller's responsibility to ensure that * @bio is not freed before the split. |
20d0189b1 block: Introduce ... |
1782 1783 1784 1785 1786 1787 1788 1789 |
*/ struct bio *bio_split(struct bio *bio, int sectors, gfp_t gfp, struct bio_set *bs) { struct bio *split = NULL; BUG_ON(sectors <= 0); BUG_ON(sectors >= bio_sectors(bio)); |
f9d03f96b block: improve ha... |
1790 |
split = bio_clone_fast(bio, gfp, bs); |
20d0189b1 block: Introduce ... |
1791 1792 1793 1794 1795 1796 |
if (!split) return NULL; split->bi_iter.bi_size = sectors << 9; if (bio_integrity(split)) |
fbd08e767 bio-integrity: fi... |
1797 |
bio_integrity_trim(split); |
20d0189b1 block: Introduce ... |
1798 1799 |
bio_advance(bio, split->bi_iter.bi_size); |
b8088c524 block: reset bi_i... |
1800 |
bio->bi_iter.bi_done = 0; |
20d0189b1 block: Introduce ... |
1801 |
|
fbbaf700e block: trace comp... |
1802 |
if (bio_flagged(bio, BIO_TRACE_COMPLETION)) |
c6c6e38ae block: Set BIO_TR... |
1803 |
bio_set_flag(split, BIO_TRACE_COMPLETION); |
fbbaf700e block: trace comp... |
1804 |
|
20d0189b1 block: Introduce ... |
1805 1806 1807 |
return split; } EXPORT_SYMBOL(bio_split); |
ad3316bf4 block: Find bio s... |
1808 |
/** |
6678d83f1 block: Consolidat... |
1809 1810 1811 1812 1813 1814 1815 1816 1817 |
* bio_trim - trim a bio * @bio: bio to trim * @offset: number of sectors to trim from the front of @bio * @size: size we want to trim @bio to, in sectors */ void bio_trim(struct bio *bio, int offset, int size) { /* 'bio' is a cloned bio which we need to trim to match * the given offset and size. |
6678d83f1 block: Consolidat... |
1818 |
*/ |
6678d83f1 block: Consolidat... |
1819 1820 |
size <<= 9; |
4f024f379 block: Abstract o... |
1821 |
if (offset == 0 && size == bio->bi_iter.bi_size) |
6678d83f1 block: Consolidat... |
1822 |
return; |
b7c44ed9d block: manipulate... |
1823 |
bio_clear_flag(bio, BIO_SEG_VALID); |
6678d83f1 block: Consolidat... |
1824 1825 |
bio_advance(bio, offset << 9); |
4f024f379 block: Abstract o... |
1826 |
bio->bi_iter.bi_size = size; |
376a78abf bio-integrity: bi... |
1827 1828 |
if (bio_integrity(bio)) |
fbd08e767 bio-integrity: fi... |
1829 |
bio_integrity_trim(bio); |
376a78abf bio-integrity: bi... |
1830 |
|
6678d83f1 block: Consolidat... |
1831 1832 |
} EXPORT_SYMBOL_GPL(bio_trim); |
1da177e4c Linux-2.6.12-rc2 |
1833 1834 1835 1836 |
/* * create memory pools for biovec's in a bio_set. * use the global biovec slabs created for general use. */ |
a6c39cb4f fs/bio: remove bs... |
1837 |
mempool_t *biovec_create_pool(int pool_entries) |
1da177e4c Linux-2.6.12-rc2 |
1838 |
{ |
ed996a52c block: simplify a... |
1839 |
struct biovec_slab *bp = bvec_slabs + BVEC_POOL_MAX; |
1da177e4c Linux-2.6.12-rc2 |
1840 |
|
9f060e223 block: Convert in... |
1841 |
return mempool_create_slab_pool(pool_entries, bp->slab); |
1da177e4c Linux-2.6.12-rc2 |
1842 1843 1844 1845 |
} void bioset_free(struct bio_set *bs) { |
df2cb6daa block: Avoid dead... |
1846 1847 |
if (bs->rescue_workqueue) destroy_workqueue(bs->rescue_workqueue); |
1da177e4c Linux-2.6.12-rc2 |
1848 1849 |
if (bs->bio_pool) mempool_destroy(bs->bio_pool); |
9f060e223 block: Convert in... |
1850 1851 |
if (bs->bvec_pool) mempool_destroy(bs->bvec_pool); |
7878cba9f block: Create bip... |
1852 |
bioset_integrity_free(bs); |
bb799ca02 bio: allow indivi... |
1853 |
bio_put_slab(bs); |
1da177e4c Linux-2.6.12-rc2 |
1854 1855 1856 |
kfree(bs); } |
a112a71d4 fs/bio.c: move EX... |
1857 |
EXPORT_SYMBOL(bioset_free); |
1da177e4c Linux-2.6.12-rc2 |
1858 |
|
011067b05 blk: replace bios... |
1859 1860 1861 1862 |
/** * 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 |
47e0fb461 blk: make the bio... |
1863 1864 |
* @flags: Flags to modify behavior, currently %BIOSET_NEED_BVECS * and %BIOSET_NEED_RESCUER |
011067b05 blk: replace bios... |
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 |
* * 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. * If %BIOSET_NEED_BVECS is set in @flags, a separate pool will be allocated * for allocating iovecs. This pool is not needed e.g. for bio_clone_fast(). |
47e0fb461 blk: make the bio... |
1875 1876 |
* If %BIOSET_NEED_RESCUER is set, a workqueue is created which can be used to * dispatch queued requests when the mempool runs out of space. |
011067b05 blk: replace bios... |
1877 1878 1879 1880 1881 |
* */ struct bio_set *bioset_create(unsigned int pool_size, unsigned int front_pad, int flags) |
1da177e4c Linux-2.6.12-rc2 |
1882 |
{ |
392ddc329 bio: add support ... |
1883 |
unsigned int back_pad = BIO_INLINE_VECS * sizeof(struct bio_vec); |
1b4344986 bio: move the sla... |
1884 |
struct bio_set *bs; |
1da177e4c Linux-2.6.12-rc2 |
1885 |
|
1b4344986 bio: move the sla... |
1886 |
bs = kzalloc(sizeof(*bs), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1887 1888 |
if (!bs) return NULL; |
bb799ca02 bio: allow indivi... |
1889 |
bs->front_pad = front_pad; |
1b4344986 bio: move the sla... |
1890 |
|
df2cb6daa block: Avoid dead... |
1891 1892 1893 |
spin_lock_init(&bs->rescue_lock); bio_list_init(&bs->rescue_list); INIT_WORK(&bs->rescue_work, bio_alloc_rescue); |
392ddc329 bio: add support ... |
1894 |
bs->bio_slab = bio_find_or_create_slab(front_pad + back_pad); |
bb799ca02 bio: allow indivi... |
1895 1896 1897 1898 1899 1900 |
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 |
1901 1902 |
if (!bs->bio_pool) goto bad; |
011067b05 blk: replace bios... |
1903 |
if (flags & BIOSET_NEED_BVECS) { |
d8f429e16 block: add bioset... |
1904 1905 1906 1907 |
bs->bvec_pool = biovec_create_pool(pool_size); if (!bs->bvec_pool) goto bad; } |
df2cb6daa block: Avoid dead... |
1908 |
|
47e0fb461 blk: make the bio... |
1909 1910 |
if (!(flags & BIOSET_NEED_RESCUER)) return bs; |
df2cb6daa block: Avoid dead... |
1911 1912 1913 |
bs->rescue_workqueue = alloc_workqueue("bioset", WQ_MEM_RECLAIM, 0); if (!bs->rescue_workqueue) goto bad; |
1da177e4c Linux-2.6.12-rc2 |
1914 |
|
df2cb6daa block: Avoid dead... |
1915 |
return bs; |
1da177e4c Linux-2.6.12-rc2 |
1916 1917 1918 1919 |
bad: bioset_free(bs); return NULL; } |
a112a71d4 fs/bio.c: move EX... |
1920 |
EXPORT_SYMBOL(bioset_create); |
1da177e4c Linux-2.6.12-rc2 |
1921 |
|
852c788f8 block: implement ... |
1922 |
#ifdef CONFIG_BLK_CGROUP |
1d933cf09 blkcg: implement ... |
1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 |
/** * bio_associate_blkcg - associate a bio with the specified blkcg * @bio: target bio * @blkcg_css: css of the blkcg to associate * * Associate @bio with the blkcg specified by @blkcg_css. Block layer will * treat @bio as if it were issued by a task which belongs to the blkcg. * * This function takes an extra reference of @blkcg_css which will be put * when @bio is released. The caller must own @bio and is responsible for * synchronizing calls to this function. */ int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css) { if (unlikely(bio->bi_css)) return -EBUSY; css_get(blkcg_css); bio->bi_css = blkcg_css; return 0; } |
5aa2a96b3 block: export bio... |
1944 |
EXPORT_SYMBOL_GPL(bio_associate_blkcg); |
1d933cf09 blkcg: implement ... |
1945 |
|
852c788f8 block: implement ... |
1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 |
/** * bio_associate_current - associate a bio with %current * @bio: target bio * * Associate @bio with %current if it hasn't been associated yet. Block * layer will treat @bio as if it were issued by %current no matter which * task actually issues it. * * This function takes an extra reference of @task's io_context and blkcg * which will be put when @bio is released. The caller must own @bio, * ensure %current->io_context exists, and is responsible for synchronizing * calls to this function. */ int bio_associate_current(struct bio *bio) { struct io_context *ioc; |
852c788f8 block: implement ... |
1962 |
|
1d933cf09 blkcg: implement ... |
1963 |
if (bio->bi_css) |
852c788f8 block: implement ... |
1964 1965 1966 1967 1968 |
return -EBUSY; ioc = current->io_context; if (!ioc) return -ENOENT; |
852c788f8 block: implement ... |
1969 1970 |
get_io_context_active(ioc); bio->bi_ioc = ioc; |
c165b3e3c blkcg: rename sub... |
1971 |
bio->bi_css = task_get_css(current, io_cgrp_id); |
852c788f8 block: implement ... |
1972 1973 |
return 0; } |
5aa2a96b3 block: export bio... |
1974 |
EXPORT_SYMBOL_GPL(bio_associate_current); |
852c788f8 block: implement ... |
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 |
/** * bio_disassociate_task - undo bio_associate_current() * @bio: target bio */ void bio_disassociate_task(struct bio *bio) { if (bio->bi_ioc) { put_io_context(bio->bi_ioc); bio->bi_ioc = NULL; } if (bio->bi_css) { css_put(bio->bi_css); bio->bi_css = NULL; } } |
20bd723ec block: add missin... |
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 |
/** * bio_clone_blkcg_association - clone blkcg association from src to dst bio * @dst: destination bio * @src: source bio */ void bio_clone_blkcg_association(struct bio *dst, struct bio *src) { if (src->bi_css) WARN_ON(bio_associate_blkcg(dst, src->bi_css)); } |
8a8e6f84a md/raid0: attach ... |
2001 |
EXPORT_SYMBOL_GPL(bio_clone_blkcg_association); |
852c788f8 block: implement ... |
2002 |
#endif /* CONFIG_BLK_CGROUP */ |
1da177e4c Linux-2.6.12-rc2 |
2003 2004 2005 |
static void __init biovec_init_slabs(void) { int i; |
ed996a52c block: simplify a... |
2006 |
for (i = 0; i < BVEC_POOL_NR; i++) { |
1da177e4c Linux-2.6.12-rc2 |
2007 2008 |
int size; struct biovec_slab *bvs = bvec_slabs + i; |
a7fcd37cd block: don't crea... |
2009 2010 2011 2012 |
if (bvs->nr_vecs <= BIO_INLINE_VECS) { bvs->slab = NULL; continue; } |
a7fcd37cd block: don't crea... |
2013 |
|
1da177e4c Linux-2.6.12-rc2 |
2014 2015 |
size = bvs->nr_vecs * sizeof(struct bio_vec); bvs->slab = kmem_cache_create(bvs->name, size, 0, |
20c2df83d mm: Remove slab d... |
2016 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
2017 2018 2019 2020 2021 |
} } static int __init init_bio(void) { |
bb799ca02 bio: allow indivi... |
2022 2023 2024 2025 2026 2027 |
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 |
2028 |
|
7878cba9f block: Create bip... |
2029 |
bio_integrity_init(); |
1da177e4c Linux-2.6.12-rc2 |
2030 |
biovec_init_slabs(); |
011067b05 blk: replace bios... |
2031 |
fs_bio_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
1da177e4c Linux-2.6.12-rc2 |
2032 2033 2034 |
if (!fs_bio_set) panic("bio: can't allocate bios "); |
a91a2785b block: Require su... |
2035 2036 2037 |
if (bioset_integrity_create(fs_bio_set, BIO_POOL_SIZE)) panic("bio: can't create integrity pool "); |
1da177e4c Linux-2.6.12-rc2 |
2038 2039 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
2040 |
subsys_initcall(init_bio); |