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block/bio.c
48.5 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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|
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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) { .nr_vecs = x, .name = "biovec-"__stringify(x) } |
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static struct biovec_slab bvec_slabs[BVEC_POOL_NR] __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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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) { return bvec_slabs[idx].nr_vecs; } |
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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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static void __bio_free(struct bio *bio) |
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{ |
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bio_disassociate_task(bio); |
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|
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if (bio_integrity(bio)) |
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bio_integrity_free(bio); |
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} |
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|
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static void bio_free(struct bio *bio) { struct bio_set *bs = bio->bi_pool; void *p; __bio_free(bio); 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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void bio_init(struct bio *bio) |
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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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} |
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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_free(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_error) parent->bi_error = bio->bi_error; |
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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; /* * 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); while ((bio = bio_list_pop(current->bio_list))) bio_list_add(bio->bi_pool == bs ? &punt : &nopunt, bio); *current->bio_list = nopunt; 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, 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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*/ if (current->bio_list && !bio_list_empty(current->bio_list)) |
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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); |
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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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|
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bio->bi_flags |= idx << BVEC_POOL_OFFSET; |
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} else if (nr_iovecs) { bvl = bio->bi_inline_vecs; |
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} |
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bio->bi_pool = bs; |
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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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|
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void zero_fill_bio(struct bio *bio) { unsigned long flags; |
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struct bio_vec bv; struct bvec_iter iter; |
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|
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501 502 503 504 |
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 |
505 506 507 508 509 510 511 512 513 514 515 |
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 |
ad0bf1107 bio_put(): add bi... |
516 |
* bio_alloc, bio_get or bio_clone. The last put of a bio will free it. |
1da177e4c Linux-2.6.12-rc2 |
517 518 519 |
**/ void bio_put(struct bio *bio) { |
dac56212e bio: skip atomic ... |
520 |
if (!bio_flagged(bio, BIO_REFFED)) |
4254bba17 block: Kill bi_de... |
521 |
bio_free(bio); |
dac56212e bio: skip atomic ... |
522 523 524 525 526 527 528 529 530 |
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 |
531 |
} |
a112a71d4 fs/bio.c: move EX... |
532 |
EXPORT_SYMBOL(bio_put); |
1da177e4c Linux-2.6.12-rc2 |
533 |
|
165125e1e [BLOCK] Get rid o... |
534 |
inline int bio_phys_segments(struct request_queue *q, struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
535 536 537 538 539 540 |
{ if (unlikely(!bio_flagged(bio, BIO_SEG_VALID))) blk_recount_segments(q, bio); return bio->bi_phys_segments; } |
a112a71d4 fs/bio.c: move EX... |
541 |
EXPORT_SYMBOL(bio_phys_segments); |
1da177e4c Linux-2.6.12-rc2 |
542 |
|
1da177e4c Linux-2.6.12-rc2 |
543 |
/** |
59d276fe0 block: Add bio_cl... |
544 545 546 547 548 549 550 551 552 553 554 555 |
* __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... |
556 |
BUG_ON(bio->bi_pool && BVEC_POOL_IDX(bio)); |
59d276fe0 block: Add bio_cl... |
557 558 559 560 561 562 |
/* * most users will be overriding ->bi_bdev with a new target, * so we don't set nor calculate new physical/hw segment counts here */ bio->bi_bdev = bio_src->bi_bdev; |
b7c44ed9d block: manipulate... |
563 |
bio_set_flag(bio, BIO_CLONED); |
1eff9d322 block: rename bio... |
564 |
bio->bi_opf = bio_src->bi_opf; |
59d276fe0 block: Add bio_cl... |
565 566 |
bio->bi_iter = bio_src->bi_iter; bio->bi_io_vec = bio_src->bi_io_vec; |
20bd723ec block: add missin... |
567 568 |
bio_clone_blkcg_association(bio, bio_src); |
59d276fe0 block: Add bio_cl... |
569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 |
} 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); /** |
bdb532074 block: Refactor b... |
606 607 |
* bio_clone_bioset - clone a bio * @bio_src: bio to clone |
1da177e4c Linux-2.6.12-rc2 |
608 |
* @gfp_mask: allocation priority |
bf800ef18 block: Add bio_cl... |
609 |
* @bs: bio_set to allocate from |
1da177e4c Linux-2.6.12-rc2 |
610 |
* |
bdb532074 block: Refactor b... |
611 612 |
* Clone bio. Caller will own the returned bio, but not the actual data it * points to. Reference count of returned bio will be one. |
1da177e4c Linux-2.6.12-rc2 |
613 |
*/ |
bdb532074 block: Refactor b... |
614 |
struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask, |
bf800ef18 block: Add bio_cl... |
615 |
struct bio_set *bs) |
1da177e4c Linux-2.6.12-rc2 |
616 |
{ |
bdb532074 block: Refactor b... |
617 618 619 |
struct bvec_iter iter; struct bio_vec bv; struct bio *bio; |
1da177e4c Linux-2.6.12-rc2 |
620 |
|
bdb532074 block: Refactor b... |
621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 |
/* * 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. */ |
8423ae3d7 block: Fix clonin... |
642 |
bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs); |
bdb532074 block: Refactor b... |
643 |
if (!bio) |
7ba1ba12e block: Block laye... |
644 |
return NULL; |
bdb532074 block: Refactor b... |
645 |
bio->bi_bdev = bio_src->bi_bdev; |
1eff9d322 block: rename bio... |
646 |
bio->bi_opf = bio_src->bi_opf; |
bdb532074 block: Refactor b... |
647 648 |
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... |
649 |
|
7afafc8a4 block: Fix secure... |
650 651 652 653 654 |
switch (bio_op(bio)) { case REQ_OP_DISCARD: case REQ_OP_SECURE_ERASE: break; case REQ_OP_WRITE_SAME: |
8423ae3d7 block: Fix clonin... |
655 |
bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0]; |
7afafc8a4 block: Fix secure... |
656 657 658 659 660 |
break; default: bio_for_each_segment(bv, bio_src, iter) bio->bi_io_vec[bio->bi_vcnt++] = bv; break; |
8423ae3d7 block: Fix clonin... |
661 |
} |
bdb532074 block: Refactor b... |
662 663 |
if (bio_integrity(bio_src)) { int ret; |
7ba1ba12e block: Block laye... |
664 |
|
bdb532074 block: Refactor b... |
665 |
ret = bio_integrity_clone(bio, bio_src, gfp_mask); |
059ea3318 block: fix memory... |
666 |
if (ret < 0) { |
bdb532074 block: Refactor b... |
667 |
bio_put(bio); |
7ba1ba12e block: Block laye... |
668 |
return NULL; |
059ea3318 block: fix memory... |
669 |
} |
3676347a5 [PATCH] kill bio-... |
670 |
} |
1da177e4c Linux-2.6.12-rc2 |
671 |
|
20bd723ec block: add missin... |
672 |
bio_clone_blkcg_association(bio, bio_src); |
bdb532074 block: Refactor b... |
673 |
return bio; |
1da177e4c Linux-2.6.12-rc2 |
674 |
} |
bf800ef18 block: Add bio_cl... |
675 |
EXPORT_SYMBOL(bio_clone_bioset); |
1da177e4c Linux-2.6.12-rc2 |
676 677 |
/** |
c66a14d07 block: simplify b... |
678 679 680 681 682 683 |
* 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 |
684 |
* |
c66a14d07 block: simplify b... |
685 686 687 688 689 690 |
* 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 |
691 |
*/ |
c66a14d07 block: simplify b... |
692 693 |
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 |
694 695 696 697 698 699 700 701 702 |
{ 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... |
703 |
if (((bio->bi_iter.bi_size + len) >> 9) > queue_max_hw_sectors(q)) |
1da177e4c Linux-2.6.12-rc2 |
704 |
return 0; |
80cfd548e [BLOCK] bio: chec... |
705 706 707 708 709 710 711 712 713 714 715 |
/* * 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... |
716 |
bio->bi_iter.bi_size += len; |
80cfd548e [BLOCK] bio: chec... |
717 718 |
goto done; } |
66cb45aa4 block: add suppor... |
719 720 721 722 723 |
/* * If the queue doesn't support SG gaps and adding this * offset would create a gap, disallow it. */ |
03100aada block: Replace SG... |
724 |
if (bvec_gap_to_prev(q, prev, offset)) |
66cb45aa4 block: add suppor... |
725 |
return 0; |
80cfd548e [BLOCK] bio: chec... |
726 727 728 |
} if (bio->bi_vcnt >= bio->bi_max_vecs) |
1da177e4c Linux-2.6.12-rc2 |
729 730 731 |
return 0; /* |
fcbf6a087 bio: modify __bio... |
732 733 734 735 736 737 738 739 740 741 742 743 744 745 |
* 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 |
746 |
*/ |
fcbf6a087 bio: modify __bio... |
747 |
while (bio->bi_phys_segments > queue_max_segments(q)) { |
1da177e4c Linux-2.6.12-rc2 |
748 749 |
if (retried_segments) |
fcbf6a087 bio: modify __bio... |
750 |
goto failed; |
1da177e4c Linux-2.6.12-rc2 |
751 752 753 754 |
retried_segments = 1; blk_recount_segments(q, bio); } |
1da177e4c Linux-2.6.12-rc2 |
755 |
/* If we may be able to merge these biovecs, force a recount */ |
fcbf6a087 bio: modify __bio... |
756 |
if (bio->bi_vcnt > 1 && (BIOVEC_PHYS_MERGEABLE(bvec-1, bvec))) |
b7c44ed9d block: manipulate... |
757 |
bio_clear_flag(bio, BIO_SEG_VALID); |
1da177e4c Linux-2.6.12-rc2 |
758 |
|
80cfd548e [BLOCK] bio: chec... |
759 |
done: |
1da177e4c Linux-2.6.12-rc2 |
760 |
return len; |
fcbf6a087 bio: modify __bio... |
761 762 763 764 765 766 767 768 769 |
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 |
770 |
} |
a112a71d4 fs/bio.c: move EX... |
771 |
EXPORT_SYMBOL(bio_add_pc_page); |
6e68af666 [SCSI] Convert SC... |
772 773 |
/** |
1da177e4c Linux-2.6.12-rc2 |
774 775 776 777 778 779 |
* 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... |
780 781 |
* 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 |
782 |
*/ |
c66a14d07 block: simplify b... |
783 784 |
int bio_add_page(struct bio *bio, struct page *page, unsigned int len, unsigned int offset) |
1da177e4c Linux-2.6.12-rc2 |
785 |
{ |
c66a14d07 block: simplify b... |
786 787 788 789 790 791 792 |
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... |
793 |
|
c66a14d07 block: simplify b... |
794 795 796 797 798 799 800 |
/* * 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... |
801 |
|
c66a14d07 block: simplify b... |
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 |
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 |
821 |
} |
a112a71d4 fs/bio.c: move EX... |
822 |
EXPORT_SYMBOL(bio_add_page); |
1da177e4c Linux-2.6.12-rc2 |
823 |
|
9e882242c block: Add submit... |
824 825 826 827 |
struct submit_bio_ret { struct completion event; int error; }; |
4246a0b63 block: add a bi_e... |
828 |
static void submit_bio_wait_endio(struct bio *bio) |
9e882242c block: Add submit... |
829 830 |
{ struct submit_bio_ret *ret = bio->bi_private; |
4246a0b63 block: add a bi_e... |
831 |
ret->error = bio->bi_error; |
9e882242c block: Add submit... |
832 833 834 835 836 |
complete(&ret->event); } /** * submit_bio_wait - submit a bio, and wait until it completes |
9e882242c block: Add submit... |
837 838 839 840 841 |
* @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. */ |
4e49ea4a3 block/fs/drivers:... |
842 |
int submit_bio_wait(struct bio *bio) |
9e882242c block: Add submit... |
843 844 |
{ struct submit_bio_ret ret; |
9e882242c block: Add submit... |
845 846 847 |
init_completion(&ret.event); bio->bi_private = &ret; bio->bi_end_io = submit_bio_wait_endio; |
1eff9d322 block: rename bio... |
848 |
bio->bi_opf |= REQ_SYNC; |
4e49ea4a3 block/fs/drivers:... |
849 |
submit_bio(bio); |
d57d61150 kernel/fs: fix I/... |
850 |
wait_for_completion_io(&ret.event); |
9e882242c block: Add submit... |
851 852 853 854 |
return ret.error; } EXPORT_SYMBOL(submit_bio_wait); |
054bdf646 block: Add bio_ad... |
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 |
/** * 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 ... |
870 |
bio_advance_iter(bio, &bio->bi_iter, bytes); |
054bdf646 block: Add bio_ad... |
871 872 |
} EXPORT_SYMBOL(bio_advance); |
16ac3d63e block: Add bio_co... |
873 |
/** |
a07876064 block: Add bio_al... |
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 |
* 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... |
902 903 904 905 906 907 908 909 910 911 912 913 914 |
* 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... |
915 916 |
struct bvec_iter src_iter, dst_iter; struct bio_vec src_bv, dst_bv; |
16ac3d63e block: Add bio_co... |
917 |
void *src_p, *dst_p; |
1cb9dda4f block: Convert bi... |
918 |
unsigned bytes; |
16ac3d63e block: Add bio_co... |
919 |
|
1cb9dda4f block: Convert bi... |
920 921 |
src_iter = src->bi_iter; dst_iter = dst->bi_iter; |
16ac3d63e block: Add bio_co... |
922 923 |
while (1) { |
1cb9dda4f block: Convert bi... |
924 925 926 927 |
if (!src_iter.bi_size) { src = src->bi_next; if (!src) break; |
16ac3d63e block: Add bio_co... |
928 |
|
1cb9dda4f block: Convert bi... |
929 |
src_iter = src->bi_iter; |
16ac3d63e block: Add bio_co... |
930 |
} |
1cb9dda4f block: Convert bi... |
931 932 933 934 |
if (!dst_iter.bi_size) { dst = dst->bi_next; if (!dst) break; |
16ac3d63e block: Add bio_co... |
935 |
|
1cb9dda4f block: Convert bi... |
936 |
dst_iter = dst->bi_iter; |
16ac3d63e block: Add bio_co... |
937 |
} |
1cb9dda4f block: Convert bi... |
938 939 940 941 |
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... |
942 |
|
1cb9dda4f block: Convert bi... |
943 944 |
src_p = kmap_atomic(src_bv.bv_page); dst_p = kmap_atomic(dst_bv.bv_page); |
16ac3d63e block: Add bio_co... |
945 |
|
1cb9dda4f block: Convert bi... |
946 947 |
memcpy(dst_p + dst_bv.bv_offset, src_p + src_bv.bv_offset, |
16ac3d63e block: Add bio_co... |
948 949 950 951 |
bytes); kunmap_atomic(dst_p); kunmap_atomic(src_p); |
1cb9dda4f block: Convert bi... |
952 953 |
bio_advance_iter(src, &src_iter, bytes); bio_advance_iter(dst, &dst_iter, bytes); |
16ac3d63e block: Add bio_co... |
954 955 956 |
} } EXPORT_SYMBOL(bio_copy_data); |
1da177e4c Linux-2.6.12-rc2 |
957 |
struct bio_map_data { |
152e283fd block: introduce ... |
958 |
int is_our_pages; |
26e49cfc7 block: pass iov_i... |
959 960 |
struct iov_iter iter; struct iovec iov[]; |
1da177e4c Linux-2.6.12-rc2 |
961 |
}; |
7410b3c6c fs/bio.c: remove ... |
962 |
static struct bio_map_data *bio_alloc_map_data(unsigned int iov_count, |
76029ff37 bio: fix bio_copy... |
963 |
gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
964 |
{ |
f3f63c1c2 block: limit vec ... |
965 966 |
if (iov_count > UIO_MAXIOV) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
967 |
|
c8db44482 block: Don't save... |
968 |
return kmalloc(sizeof(struct bio_map_data) + |
26e49cfc7 block: pass iov_i... |
969 |
sizeof(struct iovec) * iov_count, gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
970 |
} |
9124d3fe2 block: rewrite an... |
971 972 973 974 975 976 977 978 979 |
/** * 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... |
980 |
{ |
9124d3fe2 block: rewrite an... |
981 |
int i; |
c5dec1c30 block: convert bi... |
982 |
struct bio_vec *bvec; |
c5dec1c30 block: convert bi... |
983 |
|
d74c6d514 block: Add bio_fo... |
984 |
bio_for_each_segment_all(bvec, bio, i) { |
9124d3fe2 block: rewrite an... |
985 |
ssize_t ret; |
c5dec1c30 block: convert bi... |
986 |
|
9124d3fe2 block: rewrite an... |
987 988 989 990 991 992 993 994 995 996 |
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... |
997 |
} |
9124d3fe2 block: rewrite an... |
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 |
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... |
1030 |
} |
491221f88 block: export bio... |
1031 |
void bio_free_pages(struct bio *bio) |
1dfa0f68c block: add a help... |
1032 1033 1034 1035 1036 1037 1038 |
{ struct bio_vec *bvec; int i; bio_for_each_segment_all(bvec, bio, i) __free_page(bvec->bv_page); } |
491221f88 block: export bio... |
1039 |
EXPORT_SYMBOL(bio_free_pages); |
1dfa0f68c block: add a help... |
1040 |
|
1da177e4c Linux-2.6.12-rc2 |
1041 1042 1043 1044 |
/** * bio_uncopy_user - finish previously mapped bio * @bio: bio being terminated * |
ddad8dd0a block: use blk_rq... |
1045 |
* Free pages allocated from bio_copy_user_iov() and write back data |
1da177e4c Linux-2.6.12-rc2 |
1046 1047 1048 1049 1050 |
* 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... |
1051 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1052 |
|
35dc24838 [SCSI] sg: Fix us... |
1053 1054 1055 |
if (!bio_flagged(bio, BIO_NULL_MAPPED)) { /* * if we're in a workqueue, the request is orphaned, so |
2d99b55d3 bio: return EINTR... |
1056 1057 |
* 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... |
1058 |
*/ |
2d99b55d3 bio: return EINTR... |
1059 1060 1061 |
if (!current->mm) ret = -EINTR; else if (bio_data_dir(bio) == READ) |
9124d3fe2 block: rewrite an... |
1062 |
ret = bio_copy_to_iter(bio, bmd->iter); |
1dfa0f68c block: add a help... |
1063 1064 |
if (bmd->is_our_pages) bio_free_pages(bio); |
35dc24838 [SCSI] sg: Fix us... |
1065 |
} |
c8db44482 block: Don't save... |
1066 |
kfree(bmd); |
1da177e4c Linux-2.6.12-rc2 |
1067 1068 1069 1070 1071 |
bio_put(bio); return ret; } /** |
c5dec1c30 block: convert bi... |
1072 |
* bio_copy_user_iov - copy user data to bio |
26e49cfc7 block: pass iov_i... |
1073 1074 1075 1076 |
* @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 |
1077 1078 1079 1080 1081 |
* * 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 ... |
1082 1083 |
struct bio *bio_copy_user_iov(struct request_queue *q, struct rq_map_data *map_data, |
26e49cfc7 block: pass iov_i... |
1084 1085 |
const struct iov_iter *iter, gfp_t gfp_mask) |
1da177e4c Linux-2.6.12-rc2 |
1086 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1087 |
struct bio_map_data *bmd; |
1da177e4c Linux-2.6.12-rc2 |
1088 1089 1090 |
struct page *page; struct bio *bio; int i, ret; |
c5dec1c30 block: convert bi... |
1091 |
int nr_pages = 0; |
26e49cfc7 block: pass iov_i... |
1092 |
unsigned int len = iter->count; |
bd5cecea4 bio: use offset_i... |
1093 |
unsigned int offset = map_data ? offset_in_page(map_data->offset) : 0; |
1da177e4c Linux-2.6.12-rc2 |
1094 |
|
26e49cfc7 block: pass iov_i... |
1095 |
for (i = 0; i < iter->nr_segs; i++) { |
c5dec1c30 block: convert bi... |
1096 1097 1098 |
unsigned long uaddr; unsigned long end; unsigned long start; |
26e49cfc7 block: pass iov_i... |
1099 1100 1101 |
uaddr = (unsigned long) iter->iov[i].iov_base; end = (uaddr + iter->iov[i].iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
c5dec1c30 block: convert bi... |
1102 |
start = uaddr >> PAGE_SHIFT; |
cb4644cac bio: take care no... |
1103 1104 1105 1106 1107 |
/* * Overflow, abort */ if (end < start) return ERR_PTR(-EINVAL); |
c5dec1c30 block: convert bi... |
1108 |
nr_pages += end - start; |
c5dec1c30 block: convert bi... |
1109 |
} |
69838727b bio: fix memcpy c... |
1110 1111 |
if (offset) nr_pages++; |
26e49cfc7 block: pass iov_i... |
1112 |
bmd = bio_alloc_map_data(iter->nr_segs, gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
1113 1114 |
if (!bmd) return ERR_PTR(-ENOMEM); |
26e49cfc7 block: pass iov_i... |
1115 1116 1117 1118 1119 1120 1121 1122 1123 |
/* * 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); iov_iter_init(&bmd->iter, iter->type, bmd->iov, iter->nr_segs, iter->count); |
1da177e4c Linux-2.6.12-rc2 |
1124 |
ret = -ENOMEM; |
a9e9dc24b bio: use bio_kmal... |
1125 |
bio = bio_kmalloc(gfp_mask, nr_pages); |
1da177e4c Linux-2.6.12-rc2 |
1126 1127 |
if (!bio) goto out_bmd; |
26e49cfc7 block: pass iov_i... |
1128 |
if (iter->type & WRITE) |
95fe6c1a2 block, fs, mm, dr... |
1129 |
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1da177e4c Linux-2.6.12-rc2 |
1130 1131 |
ret = 0; |
56c451f4b [SCSI] block: fix... |
1132 1133 |
if (map_data) { |
e623ddb4e [SCSI] block: fix... |
1134 |
nr_pages = 1 << map_data->page_order; |
56c451f4b [SCSI] block: fix... |
1135 1136 |
i = map_data->offset / PAGE_SIZE; } |
1da177e4c Linux-2.6.12-rc2 |
1137 |
while (len) { |
e623ddb4e [SCSI] block: fix... |
1138 |
unsigned int bytes = PAGE_SIZE; |
1da177e4c Linux-2.6.12-rc2 |
1139 |
|
56c451f4b [SCSI] block: fix... |
1140 |
bytes -= offset; |
1da177e4c Linux-2.6.12-rc2 |
1141 1142 |
if (bytes > len) bytes = len; |
152e283fd block: introduce ... |
1143 |
if (map_data) { |
e623ddb4e [SCSI] block: fix... |
1144 |
if (i == map_data->nr_entries * nr_pages) { |
152e283fd block: introduce ... |
1145 1146 1147 |
ret = -ENOMEM; break; } |
e623ddb4e [SCSI] block: fix... |
1148 1149 1150 1151 1152 1153 |
page = map_data->pages[i / nr_pages]; page += (i % nr_pages); i++; } else { |
152e283fd block: introduce ... |
1154 |
page = alloc_page(q->bounce_gfp | gfp_mask); |
e623ddb4e [SCSI] block: fix... |
1155 1156 1157 1158 |
if (!page) { ret = -ENOMEM; break; } |
1da177e4c Linux-2.6.12-rc2 |
1159 |
} |
56c451f4b [SCSI] block: fix... |
1160 |
if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes) |
1da177e4c Linux-2.6.12-rc2 |
1161 |
break; |
1da177e4c Linux-2.6.12-rc2 |
1162 1163 |
len -= bytes; |
56c451f4b [SCSI] block: fix... |
1164 |
offset = 0; |
1da177e4c Linux-2.6.12-rc2 |
1165 1166 1167 1168 1169 1170 1171 1172 |
} if (ret) goto cleanup; /* * success */ |
26e49cfc7 block: pass iov_i... |
1173 |
if (((iter->type & WRITE) && (!map_data || !map_data->null_mapped)) || |
ecb554a84 block: fix sg SG_... |
1174 |
(map_data && map_data->from_user)) { |
9124d3fe2 block: rewrite an... |
1175 |
ret = bio_copy_from_iter(bio, *iter); |
c5dec1c30 block: convert bi... |
1176 1177 |
if (ret) goto cleanup; |
1da177e4c Linux-2.6.12-rc2 |
1178 |
} |
26e49cfc7 block: pass iov_i... |
1179 |
bio->bi_private = bmd; |
1da177e4c Linux-2.6.12-rc2 |
1180 1181 |
return bio; cleanup: |
152e283fd block: introduce ... |
1182 |
if (!map_data) |
1dfa0f68c block: add a help... |
1183 |
bio_free_pages(bio); |
1da177e4c Linux-2.6.12-rc2 |
1184 1185 |
bio_put(bio); out_bmd: |
c8db44482 block: Don't save... |
1186 |
kfree(bmd); |
1da177e4c Linux-2.6.12-rc2 |
1187 1188 |
return ERR_PTR(ret); } |
37f19e57a block: merge __bi... |
1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 |
/** * 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 |
1201 |
{ |
26e49cfc7 block: pass iov_i... |
1202 |
int j; |
f1970baf6 [PATCH] Add scatt... |
1203 |
int nr_pages = 0; |
1da177e4c Linux-2.6.12-rc2 |
1204 1205 |
struct page **pages; struct bio *bio; |
f1970baf6 [PATCH] Add scatt... |
1206 1207 |
int cur_page = 0; int ret, offset; |
26e49cfc7 block: pass iov_i... |
1208 1209 |
struct iov_iter i; struct iovec iov; |
1da177e4c Linux-2.6.12-rc2 |
1210 |
|
26e49cfc7 block: pass iov_i... |
1211 1212 1213 |
iov_for_each(iov, i, *iter) { unsigned long uaddr = (unsigned long) iov.iov_base; unsigned long len = iov.iov_len; |
f1970baf6 [PATCH] Add scatt... |
1214 1215 |
unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT; unsigned long start = uaddr >> PAGE_SHIFT; |
cb4644cac bio: take care no... |
1216 1217 1218 1219 1220 |
/* * Overflow, abort */ if (end < start) return ERR_PTR(-EINVAL); |
f1970baf6 [PATCH] Add scatt... |
1221 1222 |
nr_pages += end - start; /* |
a441b0d09 block: remove rem... |
1223 |
* buffer must be aligned to at least logical block size for now |
f1970baf6 [PATCH] Add scatt... |
1224 |
*/ |
ad2d72257 [PATCH] block: ki... |
1225 |
if (uaddr & queue_dma_alignment(q)) |
f1970baf6 [PATCH] Add scatt... |
1226 1227 1228 1229 |
return ERR_PTR(-EINVAL); } if (!nr_pages) |
1da177e4c Linux-2.6.12-rc2 |
1230 |
return ERR_PTR(-EINVAL); |
a9e9dc24b bio: use bio_kmal... |
1231 |
bio = bio_kmalloc(gfp_mask, nr_pages); |
1da177e4c Linux-2.6.12-rc2 |
1232 1233 1234 1235 |
if (!bio) return ERR_PTR(-ENOMEM); ret = -ENOMEM; |
a3bce90ed block: add gfp_ma... |
1236 |
pages = kcalloc(nr_pages, sizeof(struct page *), gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
1237 1238 |
if (!pages) goto out; |
26e49cfc7 block: pass iov_i... |
1239 1240 1241 |
iov_for_each(iov, i, *iter) { unsigned long uaddr = (unsigned long) iov.iov_base; unsigned long len = iov.iov_len; |
f1970baf6 [PATCH] Add scatt... |
1242 1243 1244 1245 |
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... |
1246 |
|
f5dd33c49 dio: use get_user... |
1247 |
ret = get_user_pages_fast(uaddr, local_nr_pages, |
26e49cfc7 block: pass iov_i... |
1248 1249 |
(iter->type & WRITE) != WRITE, &pages[cur_page]); |
991721572 [PATCH] Fix missi... |
1250 1251 |
if (ret < local_nr_pages) { ret = -EFAULT; |
f1970baf6 [PATCH] Add scatt... |
1252 |
goto out_unmap; |
991721572 [PATCH] Fix missi... |
1253 |
} |
f1970baf6 [PATCH] Add scatt... |
1254 |
|
bd5cecea4 bio: use offset_i... |
1255 |
offset = offset_in_page(uaddr); |
f1970baf6 [PATCH] Add scatt... |
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 |
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... |
1268 1269 |
if (bio_add_pc_page(q, bio, pages[j], bytes, offset) < bytes) |
f1970baf6 [PATCH] Add scatt... |
1270 1271 1272 1273 1274 |
break; len -= bytes; offset = 0; } |
1da177e4c Linux-2.6.12-rc2 |
1275 |
|
f1970baf6 [PATCH] Add scatt... |
1276 |
cur_page = j; |
1da177e4c Linux-2.6.12-rc2 |
1277 |
/* |
f1970baf6 [PATCH] Add scatt... |
1278 |
* release the pages we didn't map into the bio, if any |
1da177e4c Linux-2.6.12-rc2 |
1279 |
*/ |
f1970baf6 [PATCH] Add scatt... |
1280 |
while (j < page_limit) |
09cbfeaf1 mm, fs: get rid o... |
1281 |
put_page(pages[j++]); |
1da177e4c Linux-2.6.12-rc2 |
1282 |
} |
1da177e4c Linux-2.6.12-rc2 |
1283 1284 1285 1286 1287 |
kfree(pages); /* * set data direction, and check if mapped pages need bouncing */ |
26e49cfc7 block: pass iov_i... |
1288 |
if (iter->type & WRITE) |
95fe6c1a2 block, fs, mm, dr... |
1289 |
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1da177e4c Linux-2.6.12-rc2 |
1290 |
|
b7c44ed9d block: manipulate... |
1291 |
bio_set_flag(bio, BIO_USER_MAPPED); |
37f19e57a block: merge __bi... |
1292 1293 1294 1295 1296 1297 1298 1299 |
/* * 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); |
1da177e4c Linux-2.6.12-rc2 |
1300 |
return bio; |
f1970baf6 [PATCH] Add scatt... |
1301 1302 |
out_unmap: |
26e49cfc7 block: pass iov_i... |
1303 1304 |
for (j = 0; j < nr_pages; j++) { if (!pages[j]) |
f1970baf6 [PATCH] Add scatt... |
1305 |
break; |
09cbfeaf1 mm, fs: get rid o... |
1306 |
put_page(pages[j]); |
f1970baf6 [PATCH] Add scatt... |
1307 1308 |
} out: |
1da177e4c Linux-2.6.12-rc2 |
1309 1310 1311 1312 |
kfree(pages); bio_put(bio); return ERR_PTR(ret); } |
1da177e4c Linux-2.6.12-rc2 |
1313 1314 1315 1316 1317 1318 1319 1320 |
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... |
1321 |
bio_for_each_segment_all(bvec, bio, i) { |
1da177e4c Linux-2.6.12-rc2 |
1322 1323 |
if (bio_data_dir(bio) == READ) set_page_dirty_lock(bvec->bv_page); |
09cbfeaf1 mm, fs: get rid o... |
1324 |
put_page(bvec->bv_page); |
1da177e4c Linux-2.6.12-rc2 |
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 |
} 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); } |
4246a0b63 block: add a bi_e... |
1344 |
static void bio_map_kern_endio(struct bio *bio) |
b823825e8 [PATCH] Keep the ... |
1345 |
{ |
b823825e8 [PATCH] Keep the ... |
1346 |
bio_put(bio); |
b823825e8 [PATCH] Keep the ... |
1347 |
} |
75c72b836 block: merge __bi... |
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 |
/** * 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... |
1360 1361 1362 1363 1364 1365 1366 |
{ 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... |
1367 |
bio = bio_kmalloc(gfp_mask, nr_pages); |
df46b9a44 [PATCH] Add blk_r... |
1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 |
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... |
1380 |
if (bio_add_pc_page(q, bio, virt_to_page(data), bytes, |
75c72b836 block: merge __bi... |
1381 1382 1383 1384 1385 |
offset) < bytes) { /* we don't support partial mappings */ bio_put(bio); return ERR_PTR(-EINVAL); } |
df46b9a44 [PATCH] Add blk_r... |
1386 1387 1388 1389 1390 |
data += bytes; len -= bytes; offset = 0; } |
b823825e8 [PATCH] Keep the ... |
1391 |
bio->bi_end_io = bio_map_kern_endio; |
df46b9a44 [PATCH] Add blk_r... |
1392 1393 |
return bio; } |
a112a71d4 fs/bio.c: move EX... |
1394 |
EXPORT_SYMBOL(bio_map_kern); |
df46b9a44 [PATCH] Add blk_r... |
1395 |
|
4246a0b63 block: add a bi_e... |
1396 |
static void bio_copy_kern_endio(struct bio *bio) |
68154e90c block: add dma al... |
1397 |
{ |
1dfa0f68c block: add a help... |
1398 1399 1400 |
bio_free_pages(bio); bio_put(bio); } |
4246a0b63 block: add a bi_e... |
1401 |
static void bio_copy_kern_endio_read(struct bio *bio) |
1dfa0f68c block: add a help... |
1402 |
{ |
42d2683a2 block: simplify b... |
1403 |
char *p = bio->bi_private; |
1dfa0f68c block: add a help... |
1404 |
struct bio_vec *bvec; |
68154e90c block: add dma al... |
1405 |
int i; |
d74c6d514 block: Add bio_fo... |
1406 |
bio_for_each_segment_all(bvec, bio, i) { |
1dfa0f68c block: add a help... |
1407 |
memcpy(p, page_address(bvec->bv_page), bvec->bv_len); |
c8db44482 block: Don't save... |
1408 |
p += bvec->bv_len; |
68154e90c block: add dma al... |
1409 |
} |
4246a0b63 block: add a bi_e... |
1410 |
bio_copy_kern_endio(bio); |
68154e90c block: add dma al... |
1411 1412 1413 1414 1415 1416 1417 1418 |
} /** * 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 ... |
1419 |
* @reading: data direction is READ |
68154e90c block: add dma al... |
1420 1421 1422 1423 1424 1425 1426 |
* * 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... |
1427 1428 1429 |
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... |
1430 1431 |
struct bio *bio; void *p = data; |
1dfa0f68c block: add a help... |
1432 |
int nr_pages = 0; |
68154e90c block: add dma al... |
1433 |
|
42d2683a2 block: simplify b... |
1434 1435 1436 1437 1438 |
/* * Overflow, abort */ if (end < start) return ERR_PTR(-EINVAL); |
68154e90c block: add dma al... |
1439 |
|
42d2683a2 block: simplify b... |
1440 1441 1442 1443 |
nr_pages = end - start; bio = bio_kmalloc(gfp_mask, nr_pages); if (!bio) return ERR_PTR(-ENOMEM); |
68154e90c block: add dma al... |
1444 |
|
42d2683a2 block: simplify b... |
1445 1446 1447 |
while (len) { struct page *page; unsigned int bytes = PAGE_SIZE; |
68154e90c block: add dma al... |
1448 |
|
42d2683a2 block: simplify b... |
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 |
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... |
1464 |
} |
1dfa0f68c block: add a help... |
1465 1466 1467 1468 1469 |
if (reading) { bio->bi_end_io = bio_copy_kern_endio_read; bio->bi_private = data; } else { bio->bi_end_io = bio_copy_kern_endio; |
95fe6c1a2 block, fs, mm, dr... |
1470 |
bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1dfa0f68c block: add a help... |
1471 |
} |
76029ff37 bio: fix bio_copy... |
1472 |
|
68154e90c block: add dma al... |
1473 |
return bio; |
42d2683a2 block: simplify b... |
1474 1475 |
cleanup: |
1dfa0f68c block: add a help... |
1476 |
bio_free_pages(bio); |
42d2683a2 block: simplify b... |
1477 1478 |
bio_put(bio); return ERR_PTR(-ENOMEM); |
68154e90c block: add dma al... |
1479 |
} |
1da177e4c Linux-2.6.12-rc2 |
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 |
/* * 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... |
1499 |
* But other code (eg, flusher threads) could clean the pages if they are mapped |
1da177e4c Linux-2.6.12-rc2 |
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 |
* 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... |
1511 |
struct bio_vec *bvec; |
1da177e4c Linux-2.6.12-rc2 |
1512 |
int i; |
cb34e057a block: Convert so... |
1513 1514 |
bio_for_each_segment_all(bvec, bio, i) { struct page *page = bvec->bv_page; |
1da177e4c Linux-2.6.12-rc2 |
1515 1516 1517 1518 1519 |
if (page && !PageCompound(page)) set_page_dirty_lock(page); } } |
86b6c7a7f fs/block_dev.c: r... |
1520 |
static void bio_release_pages(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1521 |
{ |
cb34e057a block: Convert so... |
1522 |
struct bio_vec *bvec; |
1da177e4c Linux-2.6.12-rc2 |
1523 |
int i; |
cb34e057a block: Convert so... |
1524 1525 |
bio_for_each_segment_all(bvec, bio, i) { struct page *page = bvec->bv_page; |
1da177e4c Linux-2.6.12-rc2 |
1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 |
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... |
1539 1540 |
* 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 |
1541 |
*/ |
65f27f384 WorkStruct: Pass ... |
1542 |
static void bio_dirty_fn(struct work_struct *work); |
1da177e4c Linux-2.6.12-rc2 |
1543 |
|
65f27f384 WorkStruct: Pass ... |
1544 |
static DECLARE_WORK(bio_dirty_work, bio_dirty_fn); |
1da177e4c Linux-2.6.12-rc2 |
1545 1546 1547 1548 1549 1550 |
static DEFINE_SPINLOCK(bio_dirty_lock); static struct bio *bio_dirty_list; /* * This runs in process context */ |
65f27f384 WorkStruct: Pass ... |
1551 |
static void bio_dirty_fn(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 |
{ 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... |
1573 |
struct bio_vec *bvec; |
1da177e4c Linux-2.6.12-rc2 |
1574 1575 |
int nr_clean_pages = 0; int i; |
cb34e057a block: Convert so... |
1576 1577 |
bio_for_each_segment_all(bvec, bio, i) { struct page *page = bvec->bv_page; |
1da177e4c Linux-2.6.12-rc2 |
1578 1579 |
if (PageDirty(page) || PageCompound(page)) { |
09cbfeaf1 mm, fs: get rid o... |
1580 |
put_page(page); |
cb34e057a block: Convert so... |
1581 |
bvec->bv_page = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 |
} 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); } } |
394ffa503 blk: introduce ge... |
1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 |
void generic_start_io_acct(int rw, unsigned long sectors, struct hd_struct *part) { int cpu = part_stat_lock(); part_round_stats(cpu, part); part_stat_inc(cpu, part, ios[rw]); part_stat_add(cpu, part, sectors[rw], sectors); part_inc_in_flight(part, rw); part_stat_unlock(); } EXPORT_SYMBOL(generic_start_io_acct); void generic_end_io_acct(int rw, struct hd_struct *part, unsigned long start_time) { unsigned long duration = jiffies - start_time; int cpu = part_stat_lock(); part_stat_add(cpu, part, ticks[rw], duration); part_round_stats(cpu, part); part_dec_in_flight(part, rw); part_stat_unlock(); } EXPORT_SYMBOL(generic_end_io_acct); |
2d4dc890b block: add helper... |
1626 1627 1628 |
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE void bio_flush_dcache_pages(struct bio *bi) { |
7988613b0 block: Convert bi... |
1629 1630 |
struct bio_vec bvec; struct bvec_iter iter; |
2d4dc890b block: add helper... |
1631 |
|
7988613b0 block: Convert bi... |
1632 1633 |
bio_for_each_segment(bvec, bi, iter) flush_dcache_page(bvec.bv_page); |
2d4dc890b block: add helper... |
1634 1635 1636 |
} EXPORT_SYMBOL(bio_flush_dcache_pages); #endif |
c4cf5261f bio: skip atomic ... |
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 |
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... |
1647 |
if (atomic_dec_and_test(&bio->__bi_remaining)) { |
b7c44ed9d block: manipulate... |
1648 |
bio_clear_flag(bio, BIO_CHAIN); |
c4cf5261f bio: skip atomic ... |
1649 |
return true; |
326e1dbb5 block: remove man... |
1650 |
} |
c4cf5261f bio: skip atomic ... |
1651 1652 1653 |
return false; } |
1da177e4c Linux-2.6.12-rc2 |
1654 1655 1656 |
/** * bio_endio - end I/O on a bio * @bio: bio |
1da177e4c Linux-2.6.12-rc2 |
1657 1658 |
* * Description: |
4246a0b63 block: add a bi_e... |
1659 1660 1661 |
* 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. |
1da177e4c Linux-2.6.12-rc2 |
1662 |
**/ |
4246a0b63 block: add a bi_e... |
1663 |
void bio_endio(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
1664 |
{ |
ba8c6967b block: cleanup bi... |
1665 |
again: |
2b8855171 block: bio_remain... |
1666 |
if (!bio_remaining_done(bio)) |
ba8c6967b block: cleanup bi... |
1667 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1668 |
|
ba8c6967b block: cleanup bi... |
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 |
/* * 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... |
1680 |
} |
ba8c6967b block: cleanup bi... |
1681 1682 1683 |
if (bio->bi_end_io) bio->bi_end_io(bio); |
1da177e4c Linux-2.6.12-rc2 |
1684 |
} |
a112a71d4 fs/bio.c: move EX... |
1685 |
EXPORT_SYMBOL(bio_endio); |
1da177e4c Linux-2.6.12-rc2 |
1686 |
|
196d38bcc block: Generic bi... |
1687 |
/** |
20d0189b1 block: Introduce ... |
1688 1689 1690 1691 1692 1693 1694 1695 1696 |
* 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 ... |
1697 1698 1699 |
* 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 ... |
1700 1701 1702 1703 1704 1705 1706 1707 |
*/ 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)); |
f3f5da624 block: Do a full ... |
1708 1709 1710 1711 |
/* * Discards need a mutable bio_vec to accommodate the payload * required by the DSM TRIM and UNMAP commands. */ |
7afafc8a4 block: Fix secure... |
1712 |
if (bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_SECURE_ERASE) |
f3f5da624 block: Do a full ... |
1713 1714 1715 |
split = bio_clone_bioset(bio, gfp, bs); else split = bio_clone_fast(bio, gfp, bs); |
20d0189b1 block: Introduce ... |
1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 |
if (!split) return NULL; split->bi_iter.bi_size = sectors << 9; if (bio_integrity(split)) bio_integrity_trim(split, 0, sectors); bio_advance(bio, split->bi_iter.bi_size); return split; } EXPORT_SYMBOL(bio_split); |
ad3316bf4 block: Find bio s... |
1729 |
/** |
6678d83f1 block: Consolidat... |
1730 1731 1732 1733 1734 1735 1736 1737 1738 |
* 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... |
1739 |
*/ |
6678d83f1 block: Consolidat... |
1740 1741 |
size <<= 9; |
4f024f379 block: Abstract o... |
1742 |
if (offset == 0 && size == bio->bi_iter.bi_size) |
6678d83f1 block: Consolidat... |
1743 |
return; |
b7c44ed9d block: manipulate... |
1744 |
bio_clear_flag(bio, BIO_SEG_VALID); |
6678d83f1 block: Consolidat... |
1745 1746 |
bio_advance(bio, offset << 9); |
4f024f379 block: Abstract o... |
1747 |
bio->bi_iter.bi_size = size; |
6678d83f1 block: Consolidat... |
1748 1749 |
} EXPORT_SYMBOL_GPL(bio_trim); |
1da177e4c Linux-2.6.12-rc2 |
1750 1751 1752 1753 |
/* * create memory pools for biovec's in a bio_set. * use the global biovec slabs created for general use. */ |
a6c39cb4f fs/bio: remove bs... |
1754 |
mempool_t *biovec_create_pool(int pool_entries) |
1da177e4c Linux-2.6.12-rc2 |
1755 |
{ |
ed996a52c block: simplify a... |
1756 |
struct biovec_slab *bp = bvec_slabs + BVEC_POOL_MAX; |
1da177e4c Linux-2.6.12-rc2 |
1757 |
|
9f060e223 block: Convert in... |
1758 |
return mempool_create_slab_pool(pool_entries, bp->slab); |
1da177e4c Linux-2.6.12-rc2 |
1759 1760 1761 1762 |
} void bioset_free(struct bio_set *bs) { |
df2cb6daa block: Avoid dead... |
1763 1764 |
if (bs->rescue_workqueue) destroy_workqueue(bs->rescue_workqueue); |
1da177e4c Linux-2.6.12-rc2 |
1765 1766 |
if (bs->bio_pool) mempool_destroy(bs->bio_pool); |
9f060e223 block: Convert in... |
1767 1768 |
if (bs->bvec_pool) mempool_destroy(bs->bvec_pool); |
7878cba9f block: Create bip... |
1769 |
bioset_integrity_free(bs); |
bb799ca02 bio: allow indivi... |
1770 |
bio_put_slab(bs); |
1da177e4c Linux-2.6.12-rc2 |
1771 1772 1773 |
kfree(bs); } |
a112a71d4 fs/bio.c: move EX... |
1774 |
EXPORT_SYMBOL(bioset_free); |
1da177e4c Linux-2.6.12-rc2 |
1775 |
|
d8f429e16 block: add bioset... |
1776 1777 1778 |
static struct bio_set *__bioset_create(unsigned int pool_size, unsigned int front_pad, bool create_bvec_pool) |
1da177e4c Linux-2.6.12-rc2 |
1779 |
{ |
392ddc329 bio: add support ... |
1780 |
unsigned int back_pad = BIO_INLINE_VECS * sizeof(struct bio_vec); |
1b4344986 bio: move the sla... |
1781 |
struct bio_set *bs; |
1da177e4c Linux-2.6.12-rc2 |
1782 |
|
1b4344986 bio: move the sla... |
1783 |
bs = kzalloc(sizeof(*bs), GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1784 1785 |
if (!bs) return NULL; |
bb799ca02 bio: allow indivi... |
1786 |
bs->front_pad = front_pad; |
1b4344986 bio: move the sla... |
1787 |
|
df2cb6daa block: Avoid dead... |
1788 1789 1790 |
spin_lock_init(&bs->rescue_lock); bio_list_init(&bs->rescue_list); INIT_WORK(&bs->rescue_work, bio_alloc_rescue); |
392ddc329 bio: add support ... |
1791 |
bs->bio_slab = bio_find_or_create_slab(front_pad + back_pad); |
bb799ca02 bio: allow indivi... |
1792 1793 1794 1795 1796 1797 |
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 |
1798 1799 |
if (!bs->bio_pool) goto bad; |
d8f429e16 block: add bioset... |
1800 1801 1802 1803 1804 |
if (create_bvec_pool) { bs->bvec_pool = biovec_create_pool(pool_size); if (!bs->bvec_pool) goto bad; } |
df2cb6daa block: Avoid dead... |
1805 1806 1807 1808 |
bs->rescue_workqueue = alloc_workqueue("bioset", WQ_MEM_RECLAIM, 0); if (!bs->rescue_workqueue) goto bad; |
1da177e4c Linux-2.6.12-rc2 |
1809 |
|
df2cb6daa block: Avoid dead... |
1810 |
return bs; |
1da177e4c Linux-2.6.12-rc2 |
1811 1812 1813 1814 |
bad: bioset_free(bs); return NULL; } |
d8f429e16 block: add bioset... |
1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 |
/** * 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) { return __bioset_create(pool_size, front_pad, true); } |
a112a71d4 fs/bio.c: move EX... |
1833 |
EXPORT_SYMBOL(bioset_create); |
1da177e4c Linux-2.6.12-rc2 |
1834 |
|
d8f429e16 block: add bioset... |
1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 |
/** * bioset_create_nobvec - Create a bio_set without bio_vec mempool * @pool_size: Number of bio to cache in the mempool * @front_pad: Number of bytes to allocate in front of the returned bio * * Description: * Same functionality as bioset_create() except that mempool is not * created for bio_vecs. Saving some memory for bio_clone_fast() users. */ struct bio_set *bioset_create_nobvec(unsigned int pool_size, unsigned int front_pad) { return __bioset_create(pool_size, front_pad, false); } EXPORT_SYMBOL(bioset_create_nobvec); |
852c788f8 block: implement ... |
1849 |
#ifdef CONFIG_BLK_CGROUP |
1d933cf09 blkcg: implement ... |
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 |
/** * 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... |
1871 |
EXPORT_SYMBOL_GPL(bio_associate_blkcg); |
1d933cf09 blkcg: implement ... |
1872 |
|
852c788f8 block: implement ... |
1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 |
/** * 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 ... |
1889 |
|
1d933cf09 blkcg: implement ... |
1890 |
if (bio->bi_css) |
852c788f8 block: implement ... |
1891 1892 1893 1894 1895 |
return -EBUSY; ioc = current->io_context; if (!ioc) return -ENOENT; |
852c788f8 block: implement ... |
1896 1897 |
get_io_context_active(ioc); bio->bi_ioc = ioc; |
c165b3e3c blkcg: rename sub... |
1898 |
bio->bi_css = task_get_css(current, io_cgrp_id); |
852c788f8 block: implement ... |
1899 1900 |
return 0; } |
5aa2a96b3 block: export bio... |
1901 |
EXPORT_SYMBOL_GPL(bio_associate_current); |
852c788f8 block: implement ... |
1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 |
/** * 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... |
1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 |
/** * 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)); } |
852c788f8 block: implement ... |
1928 |
#endif /* CONFIG_BLK_CGROUP */ |
1da177e4c Linux-2.6.12-rc2 |
1929 1930 1931 |
static void __init biovec_init_slabs(void) { int i; |
ed996a52c block: simplify a... |
1932 |
for (i = 0; i < BVEC_POOL_NR; i++) { |
1da177e4c Linux-2.6.12-rc2 |
1933 1934 |
int size; struct biovec_slab *bvs = bvec_slabs + i; |
a7fcd37cd block: don't crea... |
1935 1936 1937 1938 |
if (bvs->nr_vecs <= BIO_INLINE_VECS) { bvs->slab = NULL; continue; } |
a7fcd37cd block: don't crea... |
1939 |
|
1da177e4c Linux-2.6.12-rc2 |
1940 1941 |
size = bvs->nr_vecs * sizeof(struct bio_vec); bvs->slab = kmem_cache_create(bvs->name, size, 0, |
20c2df83d mm: Remove slab d... |
1942 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1943 1944 1945 1946 1947 |
} } static int __init init_bio(void) { |
bb799ca02 bio: allow indivi... |
1948 1949 1950 1951 1952 1953 |
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 |
1954 |
|
7878cba9f block: Create bip... |
1955 |
bio_integrity_init(); |
1da177e4c Linux-2.6.12-rc2 |
1956 |
biovec_init_slabs(); |
bb799ca02 bio: allow indivi... |
1957 |
fs_bio_set = bioset_create(BIO_POOL_SIZE, 0); |
1da177e4c Linux-2.6.12-rc2 |
1958 1959 1960 |
if (!fs_bio_set) panic("bio: can't allocate bios "); |
a91a2785b block: Require su... |
1961 1962 1963 |
if (bioset_integrity_create(fs_bio_set, BIO_POOL_SIZE)) panic("bio: can't create integrity pool "); |
1da177e4c Linux-2.6.12-rc2 |
1964 1965 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1966 |
subsys_initcall(init_bio); |