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fs/aio.c
45.9 KB
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/* * An async IO implementation for Linux * Written by Benjamin LaHaise <bcrl@kvack.org> * * Implements an efficient asynchronous io interface. * * Copyright 2000, 2001, 2002 Red Hat, Inc. All Rights Reserved. * * See ../COPYING for licensing terms. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/errno.h> #include <linux/time.h> #include <linux/aio_abi.h> #include <linux/module.h> #include <linux/syscalls.h> |
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#include <linux/backing-dev.h> |
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#include <linux/uio.h> |
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#define DEBUG 0 #include <linux/sched.h> #include <linux/fs.h> #include <linux/file.h> #include <linux/mm.h> #include <linux/mman.h> |
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#include <linux/mmu_context.h> |
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#include <linux/slab.h> #include <linux/timer.h> #include <linux/aio.h> #include <linux/highmem.h> #include <linux/workqueue.h> #include <linux/security.h> |
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#include <linux/eventfd.h> |
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#include <linux/blkdev.h> |
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#include <linux/compat.h> |
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#include <asm/kmap_types.h> #include <asm/uaccess.h> |
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#if DEBUG > 1 #define dprintk printk #else #define dprintk(x...) do { ; } while (0) #endif |
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/*------ sysctl variables----*/ |
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static DEFINE_SPINLOCK(aio_nr_lock); unsigned long aio_nr; /* current system wide number of aio requests */ unsigned long aio_max_nr = 0x10000; /* system wide maximum number of aio requests */ |
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/*----end sysctl variables---*/ |
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static struct kmem_cache *kiocb_cachep; static struct kmem_cache *kioctx_cachep; |
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static struct workqueue_struct *aio_wq; /* Used for rare fput completion. */ |
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static void aio_fput_routine(struct work_struct *); static DECLARE_WORK(fput_work, aio_fput_routine); |
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static DEFINE_SPINLOCK(fput_lock); |
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static LIST_HEAD(fput_head); |
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|
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static void aio_kick_handler(struct work_struct *); |
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static void aio_queue_work(struct kioctx *); |
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/* aio_setup * Creates the slab caches used by the aio routines, panic on * failure as this is done early during the boot sequence. */ static int __init aio_setup(void) { |
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kiocb_cachep = KMEM_CACHE(kiocb, SLAB_HWCACHE_ALIGN|SLAB_PANIC); kioctx_cachep = KMEM_CACHE(kioctx,SLAB_HWCACHE_ALIGN|SLAB_PANIC); |
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aio_wq = alloc_workqueue("aio", 0, 1); /* used to limit concurrency */ |
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BUG_ON(!aio_wq); |
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pr_debug("aio_setup: sizeof(struct page) = %d ", (int)sizeof(struct page)); return 0; } |
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__initcall(aio_setup); |
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static void aio_free_ring(struct kioctx *ctx) { struct aio_ring_info *info = &ctx->ring_info; long i; for (i=0; i<info->nr_pages; i++) put_page(info->ring_pages[i]); if (info->mmap_size) { down_write(&ctx->mm->mmap_sem); do_munmap(ctx->mm, info->mmap_base, info->mmap_size); up_write(&ctx->mm->mmap_sem); } if (info->ring_pages && info->ring_pages != info->internal_pages) kfree(info->ring_pages); info->ring_pages = NULL; info->nr = 0; } static int aio_setup_ring(struct kioctx *ctx) { struct aio_ring *ring; struct aio_ring_info *info = &ctx->ring_info; unsigned nr_events = ctx->max_reqs; unsigned long size; int nr_pages; /* Compensate for the ring buffer's head/tail overlap entry */ nr_events += 2; /* 1 is required, 2 for good luck */ size = sizeof(struct aio_ring); size += sizeof(struct io_event) * nr_events; nr_pages = (size + PAGE_SIZE-1) >> PAGE_SHIFT; if (nr_pages < 0) return -EINVAL; nr_events = (PAGE_SIZE * nr_pages - sizeof(struct aio_ring)) / sizeof(struct io_event); info->nr = 0; info->ring_pages = info->internal_pages; if (nr_pages > AIO_RING_PAGES) { |
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info->ring_pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL); |
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if (!info->ring_pages) return -ENOMEM; |
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} info->mmap_size = nr_pages * PAGE_SIZE; dprintk("attempting mmap of %lu bytes ", info->mmap_size); down_write(&ctx->mm->mmap_sem); info->mmap_base = do_mmap(NULL, 0, info->mmap_size, |
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PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, |
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0); if (IS_ERR((void *)info->mmap_base)) { up_write(&ctx->mm->mmap_sem); |
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info->mmap_size = 0; aio_free_ring(ctx); return -EAGAIN; } dprintk("mmap address: 0x%08lx ", info->mmap_base); info->nr_pages = get_user_pages(current, ctx->mm, info->mmap_base, nr_pages, 1, 0, info->ring_pages, NULL); up_write(&ctx->mm->mmap_sem); if (unlikely(info->nr_pages != nr_pages)) { aio_free_ring(ctx); return -EAGAIN; } ctx->user_id = info->mmap_base; info->nr = nr_events; /* trusted copy */ ring = kmap_atomic(info->ring_pages[0], KM_USER0); ring->nr = nr_events; /* user copy */ ring->id = ctx->user_id; ring->head = ring->tail = 0; ring->magic = AIO_RING_MAGIC; ring->compat_features = AIO_RING_COMPAT_FEATURES; ring->incompat_features = AIO_RING_INCOMPAT_FEATURES; ring->header_length = sizeof(struct aio_ring); kunmap_atomic(ring, KM_USER0); return 0; } /* aio_ring_event: returns a pointer to the event at the given index from * kmap_atomic(, km). Release the pointer with put_aio_ring_event(); */ #define AIO_EVENTS_PER_PAGE (PAGE_SIZE / sizeof(struct io_event)) #define AIO_EVENTS_FIRST_PAGE ((PAGE_SIZE - sizeof(struct aio_ring)) / sizeof(struct io_event)) #define AIO_EVENTS_OFFSET (AIO_EVENTS_PER_PAGE - AIO_EVENTS_FIRST_PAGE) #define aio_ring_event(info, nr, km) ({ \ unsigned pos = (nr) + AIO_EVENTS_OFFSET; \ struct io_event *__event; \ __event = kmap_atomic( \ (info)->ring_pages[pos / AIO_EVENTS_PER_PAGE], km); \ __event += pos % AIO_EVENTS_PER_PAGE; \ __event; \ }) #define put_aio_ring_event(event, km) do { \ struct io_event *__event = (event); \ (void)__event; \ kunmap_atomic((void *)((unsigned long)__event & PAGE_MASK), km); \ } while(0) |
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static void ctx_rcu_free(struct rcu_head *head) { struct kioctx *ctx = container_of(head, struct kioctx, rcu_head); unsigned nr_events = ctx->max_reqs; kmem_cache_free(kioctx_cachep, ctx); if (nr_events) { spin_lock(&aio_nr_lock); BUG_ON(aio_nr - nr_events > aio_nr); aio_nr -= nr_events; spin_unlock(&aio_nr_lock); } } |
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/* __put_ioctx * Called when the last user of an aio context has gone away, * and the struct needs to be freed. */ static void __put_ioctx(struct kioctx *ctx) { |
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BUG_ON(ctx->reqs_active); cancel_delayed_work(&ctx->wq); cancel_work_sync(&ctx->wq.work); aio_free_ring(ctx); mmdrop(ctx->mm); ctx->mm = NULL; pr_debug("__put_ioctx: freeing %p ", ctx); |
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call_rcu(&ctx->rcu_head, ctx_rcu_free); |
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} |
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static inline void get_ioctx(struct kioctx *kioctx) { BUG_ON(atomic_read(&kioctx->users) <= 0); atomic_inc(&kioctx->users); } static inline int try_get_ioctx(struct kioctx *kioctx) { return atomic_inc_not_zero(&kioctx->users); } static inline void put_ioctx(struct kioctx *kioctx) { BUG_ON(atomic_read(&kioctx->users) <= 0); if (unlikely(atomic_dec_and_test(&kioctx->users))) __put_ioctx(kioctx); } |
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/* ioctx_alloc * Allocates and initializes an ioctx. Returns an ERR_PTR if it failed. */ static struct kioctx *ioctx_alloc(unsigned nr_events) { struct mm_struct *mm; struct kioctx *ctx; |
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int did_sync = 0; |
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/* Prevent overflows */ if ((nr_events > (0x10000000U / sizeof(struct io_event))) || (nr_events > (0x10000000U / sizeof(struct kiocb)))) { pr_debug("ENOMEM: nr_events too high "); return ERR_PTR(-EINVAL); } |
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if ((unsigned long)nr_events > aio_max_nr) |
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return ERR_PTR(-EAGAIN); |
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ctx = kmem_cache_zalloc(kioctx_cachep, GFP_KERNEL); |
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if (!ctx) return ERR_PTR(-ENOMEM); |
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ctx->max_reqs = nr_events; mm = ctx->mm = current->mm; atomic_inc(&mm->mm_count); atomic_set(&ctx->users, 1); spin_lock_init(&ctx->ctx_lock); spin_lock_init(&ctx->ring_info.ring_lock); init_waitqueue_head(&ctx->wait); INIT_LIST_HEAD(&ctx->active_reqs); INIT_LIST_HEAD(&ctx->run_list); |
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INIT_DELAYED_WORK(&ctx->wq, aio_kick_handler); |
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if (aio_setup_ring(ctx) < 0) goto out_freectx; /* limit the number of system wide aios */ |
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do { spin_lock_bh(&aio_nr_lock); if (aio_nr + nr_events > aio_max_nr || aio_nr + nr_events < aio_nr) ctx->max_reqs = 0; else aio_nr += ctx->max_reqs; spin_unlock_bh(&aio_nr_lock); if (ctx->max_reqs || did_sync) break; /* wait for rcu callbacks to have completed before giving up */ synchronize_rcu(); did_sync = 1; ctx->max_reqs = nr_events; } while (1); |
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if (ctx->max_reqs == 0) |
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goto out_cleanup; |
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/* now link into global list. */ |
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spin_lock(&mm->ioctx_lock); hlist_add_head_rcu(&ctx->list, &mm->ioctx_list); spin_unlock(&mm->ioctx_lock); |
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dprintk("aio: allocated ioctx %p[%ld]: mm=%p mask=0x%x ", ctx, ctx->user_id, current->mm, ctx->ring_info.nr); return ctx; out_cleanup: |
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__put_ioctx(ctx); return ERR_PTR(-EAGAIN); out_freectx: mmdrop(mm); kmem_cache_free(kioctx_cachep, ctx); ctx = ERR_PTR(-ENOMEM); dprintk("aio: error allocating ioctx %p ", ctx); return ctx; } /* aio_cancel_all * Cancels all outstanding aio requests on an aio context. Used * when the processes owning a context have all exited to encourage * the rapid destruction of the kioctx. */ static void aio_cancel_all(struct kioctx *ctx) { int (*cancel)(struct kiocb *, struct io_event *); struct io_event res; spin_lock_irq(&ctx->ctx_lock); ctx->dead = 1; while (!list_empty(&ctx->active_reqs)) { struct list_head *pos = ctx->active_reqs.next; struct kiocb *iocb = list_kiocb(pos); list_del_init(&iocb->ki_list); cancel = iocb->ki_cancel; kiocbSetCancelled(iocb); if (cancel) { iocb->ki_users++; spin_unlock_irq(&ctx->ctx_lock); cancel(iocb, &res); spin_lock_irq(&ctx->ctx_lock); } } spin_unlock_irq(&ctx->ctx_lock); } |
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static void wait_for_all_aios(struct kioctx *ctx) |
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{ struct task_struct *tsk = current; DECLARE_WAITQUEUE(wait, tsk); |
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spin_lock_irq(&ctx->ctx_lock); |
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if (!ctx->reqs_active) |
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goto out; |
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add_wait_queue(&ctx->wait, &wait); set_task_state(tsk, TASK_UNINTERRUPTIBLE); while (ctx->reqs_active) { |
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spin_unlock_irq(&ctx->ctx_lock); |
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io_schedule(); |
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set_task_state(tsk, TASK_UNINTERRUPTIBLE); |
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spin_lock_irq(&ctx->ctx_lock); |
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} __set_task_state(tsk, TASK_RUNNING); remove_wait_queue(&ctx->wait, &wait); |
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out: spin_unlock_irq(&ctx->ctx_lock); |
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} /* wait_on_sync_kiocb: * Waits on the given sync kiocb to complete. */ |
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ssize_t wait_on_sync_kiocb(struct kiocb *iocb) |
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{ while (iocb->ki_users) { set_current_state(TASK_UNINTERRUPTIBLE); if (!iocb->ki_users) break; |
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io_schedule(); |
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} __set_current_state(TASK_RUNNING); return iocb->ki_user_data; } |
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EXPORT_SYMBOL(wait_on_sync_kiocb); |
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/* exit_aio: called when the last user of mm goes away. At this point, * there is no way for any new requests to be submited or any of the * io_* syscalls to be called on the context. However, there may be * outstanding requests which hold references to the context; as they * go away, they will call put_ioctx and release any pinned memory * associated with the request (held via struct page * references). */ |
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void exit_aio(struct mm_struct *mm) |
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{ |
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struct kioctx *ctx; while (!hlist_empty(&mm->ioctx_list)) { ctx = hlist_entry(mm->ioctx_list.first, struct kioctx, list); hlist_del_rcu(&ctx->list); |
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aio_cancel_all(ctx); wait_for_all_aios(ctx); /* |
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* Ensure we don't leave the ctx on the aio_wq |
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*/ |
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cancel_work_sync(&ctx->wq.work); |
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if (1 != atomic_read(&ctx->users)) printk(KERN_DEBUG "exit_aio:ioctx still alive: %d %d %d ", atomic_read(&ctx->users), ctx->dead, ctx->reqs_active); put_ioctx(ctx); |
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} } |
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/* aio_get_req * Allocate a slot for an aio request. Increments the users count * of the kioctx so that the kioctx stays around until all requests are * complete. Returns NULL if no requests are free. * * Returns with kiocb->users set to 2. The io submit code path holds * an extra reference while submitting the i/o. * This prevents races between the aio code path referencing the * req (after submitting it) and aio_complete() freeing the req. */ |
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static struct kiocb *__aio_get_req(struct kioctx *ctx) |
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{ struct kiocb *req = NULL; struct aio_ring *ring; int okay = 0; req = kmem_cache_alloc(kiocb_cachep, GFP_KERNEL); if (unlikely(!req)) return NULL; |
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req->ki_flags = 0; |
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req->ki_users = 2; req->ki_key = 0; req->ki_ctx = ctx; req->ki_cancel = NULL; req->ki_retry = NULL; |
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req->ki_dtor = NULL; req->private = NULL; |
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req->ki_iovec = NULL; |
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INIT_LIST_HEAD(&req->ki_run_list); |
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req->ki_eventfd = NULL; |
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/* Check if the completion queue has enough free space to * accept an event from this io. */ spin_lock_irq(&ctx->ctx_lock); ring = kmap_atomic(ctx->ring_info.ring_pages[0], KM_USER0); if (ctx->reqs_active < aio_ring_avail(&ctx->ring_info, ring)) { list_add(&req->ki_list, &ctx->active_reqs); |
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ctx->reqs_active++; okay = 1; } kunmap_atomic(ring, KM_USER0); spin_unlock_irq(&ctx->ctx_lock); if (!okay) { kmem_cache_free(kiocb_cachep, req); req = NULL; } return req; } static inline struct kiocb *aio_get_req(struct kioctx *ctx) { struct kiocb *req; /* Handle a potential starvation case -- should be exceedingly rare as * requests will be stuck on fput_head only if the aio_fput_routine is * delayed and the requests were the last user of the struct file. */ req = __aio_get_req(ctx); if (unlikely(NULL == req)) { aio_fput_routine(NULL); req = __aio_get_req(ctx); } return req; } static inline void really_put_req(struct kioctx *ctx, struct kiocb *req) { |
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assert_spin_locked(&ctx->ctx_lock); |
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if (req->ki_eventfd != NULL) eventfd_ctx_put(req->ki_eventfd); |
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if (req->ki_dtor) req->ki_dtor(req); |
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if (req->ki_iovec != &req->ki_inline_vec) kfree(req->ki_iovec); |
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kmem_cache_free(kiocb_cachep, req); ctx->reqs_active--; if (unlikely(!ctx->reqs_active && ctx->dead)) |
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wake_up_all(&ctx->wait); |
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} |
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static void aio_fput_routine(struct work_struct *data) |
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{ spin_lock_irq(&fput_lock); while (likely(!list_empty(&fput_head))) { struct kiocb *req = list_kiocb(fput_head.next); struct kioctx *ctx = req->ki_ctx; list_del(&req->ki_list); spin_unlock_irq(&fput_lock); |
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/* Complete the fput(s) */ if (req->ki_filp != NULL) |
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fput(req->ki_filp); |
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/* Link the iocb into the context's free list */ spin_lock_irq(&ctx->ctx_lock); really_put_req(ctx, req); spin_unlock_irq(&ctx->ctx_lock); put_ioctx(ctx); spin_lock_irq(&fput_lock); } spin_unlock_irq(&fput_lock); } /* __aio_put_req * Returns true if this put was the last user of the request. */ static int __aio_put_req(struct kioctx *ctx, struct kiocb *req) { |
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dprintk(KERN_DEBUG "aio_put(%p): f_count=%ld ", req, atomic_long_read(&req->ki_filp->f_count)); |
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|
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assert_spin_locked(&ctx->ctx_lock); |
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req->ki_users--; |
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542 |
BUG_ON(req->ki_users < 0); |
1da177e4c Linux-2.6.12-rc2 |
543 544 545 546 547 |
if (likely(req->ki_users)) return 0; list_del(&req->ki_list); /* remove from active_reqs */ req->ki_cancel = NULL; req->ki_retry = NULL; |
87c3a86e1 eventfd: remove f... |
548 549 |
/* * Try to optimize the aio and eventfd file* puts, by avoiding to |
d7065da03 get rid of the ma... |
550 |
* schedule work in case it is not final fput() time. In normal cases, |
87c3a86e1 eventfd: remove f... |
551 552 |
* we would not be holding the last reference to the file*, so * this function will be executed w/out any aio kthread wakeup. |
1da177e4c Linux-2.6.12-rc2 |
553 |
*/ |
d7065da03 get rid of the ma... |
554 |
if (unlikely(!fput_atomic(req->ki_filp))) { |
1da177e4c Linux-2.6.12-rc2 |
555 556 557 558 |
get_ioctx(ctx); spin_lock(&fput_lock); list_add(&req->ki_list, &fput_head); spin_unlock(&fput_lock); |
d37adaa15 fs/aio: aio_wq is... |
559 |
schedule_work(&fput_work); |
133890103 eventfd: revised ... |
560 561 |
} else { req->ki_filp = NULL; |
1da177e4c Linux-2.6.12-rc2 |
562 |
really_put_req(ctx, req); |
133890103 eventfd: revised ... |
563 |
} |
1da177e4c Linux-2.6.12-rc2 |
564 565 566 567 568 569 570 |
return 1; } /* aio_put_req * Returns true if this put was the last user of the kiocb, * false if the request is still in use. */ |
fc9b52cd8 fs: remove fastca... |
571 |
int aio_put_req(struct kiocb *req) |
1da177e4c Linux-2.6.12-rc2 |
572 573 574 575 576 577 |
{ struct kioctx *ctx = req->ki_ctx; int ret; spin_lock_irq(&ctx->ctx_lock); ret = __aio_put_req(ctx, req); spin_unlock_irq(&ctx->ctx_lock); |
1da177e4c Linux-2.6.12-rc2 |
578 579 |
return ret; } |
385773e04 aio.c: move EXPOR... |
580 |
EXPORT_SYMBOL(aio_put_req); |
1da177e4c Linux-2.6.12-rc2 |
581 |
|
d5470b596 fs/aio.c: make 3 ... |
582 |
static struct kioctx *lookup_ioctx(unsigned long ctx_id) |
1da177e4c Linux-2.6.12-rc2 |
583 |
{ |
abf137dd7 aio: make the loo... |
584 |
struct mm_struct *mm = current->mm; |
65c24491b aio: lookup_ioctx... |
585 |
struct kioctx *ctx, *ret = NULL; |
abf137dd7 aio: make the loo... |
586 |
struct hlist_node *n; |
1da177e4c Linux-2.6.12-rc2 |
587 |
|
abf137dd7 aio: make the loo... |
588 589 590 |
rcu_read_lock(); hlist_for_each_entry_rcu(ctx, n, &mm->ioctx_list, list) { |
3bd9a5d73 aio: fix rcu ioct... |
591 592 593 594 595 596 597 |
/* * RCU protects us against accessing freed memory but * we have to be careful not to get a reference when the * reference count already dropped to 0 (ctx->dead test * is unreliable because of races). */ if (ctx->user_id == ctx_id && !ctx->dead && try_get_ioctx(ctx)){ |
65c24491b aio: lookup_ioctx... |
598 |
ret = ctx; |
1da177e4c Linux-2.6.12-rc2 |
599 600 |
break; } |
abf137dd7 aio: make the loo... |
601 |
} |
1da177e4c Linux-2.6.12-rc2 |
602 |
|
abf137dd7 aio: make the loo... |
603 |
rcu_read_unlock(); |
65c24491b aio: lookup_ioctx... |
604 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
605 606 607 |
} /* |
1da177e4c Linux-2.6.12-rc2 |
608 609 610 611 612 613 614 |
* Queue up a kiocb to be retried. Assumes that the kiocb * has already been marked as kicked, and places it on * the retry run list for the corresponding ioctx, if it * isn't already queued. Returns 1 if it actually queued * the kiocb (to tell the caller to activate the work * queue to process it), or 0, if it found that it was * already queued. |
1da177e4c Linux-2.6.12-rc2 |
615 616 617 618 |
*/ static inline int __queue_kicked_iocb(struct kiocb *iocb) { struct kioctx *ctx = iocb->ki_ctx; |
d00689af6 [PATCH] aio: repl... |
619 |
assert_spin_locked(&ctx->ctx_lock); |
1da177e4c Linux-2.6.12-rc2 |
620 621 622 |
if (list_empty(&iocb->ki_run_list)) { list_add_tail(&iocb->ki_run_list, &ctx->run_list); |
1da177e4c Linux-2.6.12-rc2 |
623 624 625 626 627 628 629 630 631 632 |
return 1; } return 0; } /* aio_run_iocb * This is the core aio execution routine. It is * invoked both for initial i/o submission and * subsequent retries via the aio_kick_handler. * Expects to be invoked with iocb->ki_ctx->lock |
d6e05edc5 spelling fixes |
633 |
* already held. The lock is released and reacquired |
1da177e4c Linux-2.6.12-rc2 |
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 |
* as needed during processing. * * Calls the iocb retry method (already setup for the * iocb on initial submission) for operation specific * handling, but takes care of most of common retry * execution details for a given iocb. The retry method * needs to be non-blocking as far as possible, to avoid * holding up other iocbs waiting to be serviced by the * retry kernel thread. * * The trickier parts in this code have to do with * ensuring that only one retry instance is in progress * for a given iocb at any time. Providing that guarantee * simplifies the coding of individual aio operations as * it avoids various potential races. */ static ssize_t aio_run_iocb(struct kiocb *iocb) { struct kioctx *ctx = iocb->ki_ctx; ssize_t (*retry)(struct kiocb *); ssize_t ret; |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 |
if (!(retry = iocb->ki_retry)) { printk("aio_run_iocb: iocb->ki_retry = NULL "); return 0; } /* * We don't want the next retry iteration for this * operation to start until this one has returned and * updated the iocb state. However, wait_queue functions * can trigger a kick_iocb from interrupt context in the * meantime, indicating that data is available for the next * iteration. We want to remember that and enable the * next retry iteration _after_ we are through with * this one. * * So, in order to be able to register a "kick", but * prevent it from being queued now, we clear the kick * flag, but make the kick code *think* that the iocb is * still on the run list until we are actually done. * When we are done with this iteration, we check if * the iocb was kicked in the meantime and if so, queue * it up afresh. */ kiocbClearKicked(iocb); /* * This is so that aio_complete knows it doesn't need to * pull the iocb off the run list (We can't just call * INIT_LIST_HEAD because we don't want a kick_iocb to * queue this on the run list yet) */ iocb->ki_run_list.next = iocb->ki_run_list.prev = NULL; spin_unlock_irq(&ctx->ctx_lock); /* Quit retrying if the i/o has been cancelled */ if (kiocbIsCancelled(iocb)) { ret = -EINTR; aio_complete(iocb, ret, 0); /* must not access the iocb after this */ goto out; } /* * Now we are all set to call the retry method in async |
6212e3a38 Remove struct tas... |
701 |
* context. |
1da177e4c Linux-2.6.12-rc2 |
702 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
703 |
ret = retry(iocb); |
1da177e4c Linux-2.6.12-rc2 |
704 |
|
a0c42bac7 aio: do not retur... |
705 706 707 708 709 710 711 712 |
if (ret != -EIOCBRETRY && ret != -EIOCBQUEUED) { /* * There's no easy way to restart the syscall since other AIO's * may be already running. Just fail this IO with EINTR. */ if (unlikely(ret == -ERESTARTSYS || ret == -ERESTARTNOINTR || ret == -ERESTARTNOHAND || ret == -ERESTART_RESTARTBLOCK)) ret = -EINTR; |
897f15fb5 [PATCH] aio: remo... |
713 |
aio_complete(iocb, ret, 0); |
a0c42bac7 aio: do not retur... |
714 |
} |
1da177e4c Linux-2.6.12-rc2 |
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 |
out: spin_lock_irq(&ctx->ctx_lock); if (-EIOCBRETRY == ret) { /* * OK, now that we are done with this iteration * and know that there is more left to go, * this is where we let go so that a subsequent * "kick" can start the next iteration */ /* will make __queue_kicked_iocb succeed from here on */ INIT_LIST_HEAD(&iocb->ki_run_list); /* we must queue the next iteration ourselves, if it * has already been kicked */ if (kiocbIsKicked(iocb)) { __queue_kicked_iocb(iocb); |
c016e2257 [PATCH] aio-retry... |
732 733 734 735 736 737 738 739 |
/* * __queue_kicked_iocb will always return 1 here, because * iocb->ki_run_list is empty at this point so it should * be safe to unconditionally queue the context into the * work queue. */ aio_queue_work(ctx); |
1da177e4c Linux-2.6.12-rc2 |
740 741 742 743 744 745 746 747 748 749 |
} } return ret; } /* * __aio_run_iocbs: * Process all pending retries queued on the ioctx * run list. * Assumes it is operating within the aio issuer's mm |
d00689af6 [PATCH] aio: repl... |
750 |
* context. |
1da177e4c Linux-2.6.12-rc2 |
751 752 753 754 |
*/ static int __aio_run_iocbs(struct kioctx *ctx) { struct kiocb *iocb; |
626ab0e69 [PATCH] list: use... |
755 |
struct list_head run_list; |
1da177e4c Linux-2.6.12-rc2 |
756 |
|
d00689af6 [PATCH] aio: repl... |
757 |
assert_spin_locked(&ctx->ctx_lock); |
626ab0e69 [PATCH] list: use... |
758 |
list_replace_init(&ctx->run_list, &run_list); |
1da177e4c Linux-2.6.12-rc2 |
759 760 761 762 763 764 765 766 767 |
while (!list_empty(&run_list)) { iocb = list_entry(run_list.next, struct kiocb, ki_run_list); list_del(&iocb->ki_run_list); /* * Hold an extra reference while retrying i/o. */ iocb->ki_users++; /* grab extra reference */ aio_run_iocb(iocb); |
dee11c236 [PATCH] aio: fix ... |
768 |
__aio_put_req(ctx, iocb); |
1da177e4c Linux-2.6.12-rc2 |
769 |
} |
1da177e4c Linux-2.6.12-rc2 |
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 |
if (!list_empty(&ctx->run_list)) return 1; return 0; } static void aio_queue_work(struct kioctx * ctx) { unsigned long timeout; /* * if someone is waiting, get the work started right * away, otherwise, use a longer delay */ smp_mb(); if (waitqueue_active(&ctx->wait)) timeout = 1; else timeout = HZ/10; queue_delayed_work(aio_wq, &ctx->wq, timeout); } |
1da177e4c Linux-2.6.12-rc2 |
789 |
/* |
d3486f8b9 aio: remove unuse... |
790 791 792 793 794 |
* aio_run_all_iocbs: * Process all pending retries queued on the ioctx * run list, and keep running them until the list * stays empty. * Assumes it is operating within the aio issuer's mm context. |
1da177e4c Linux-2.6.12-rc2 |
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 |
*/ static inline void aio_run_all_iocbs(struct kioctx *ctx) { spin_lock_irq(&ctx->ctx_lock); while (__aio_run_iocbs(ctx)) ; spin_unlock_irq(&ctx->ctx_lock); } /* * aio_kick_handler: * Work queue handler triggered to process pending * retries on an ioctx. Takes on the aio issuer's * mm context before running the iocbs, so that * copy_xxx_user operates on the issuer's address * space. * Run on aiod's context. */ |
65f27f384 WorkStruct: Pass ... |
813 |
static void aio_kick_handler(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
814 |
{ |
65f27f384 WorkStruct: Pass ... |
815 |
struct kioctx *ctx = container_of(work, struct kioctx, wq.work); |
1da177e4c Linux-2.6.12-rc2 |
816 |
mm_segment_t oldfs = get_fs(); |
1ebb1101c [PATCH] Fix lock ... |
817 |
struct mm_struct *mm; |
1da177e4c Linux-2.6.12-rc2 |
818 819 820 821 822 823 |
int requeue; set_fs(USER_DS); use_mm(ctx->mm); spin_lock_irq(&ctx->ctx_lock); requeue =__aio_run_iocbs(ctx); |
1ebb1101c [PATCH] Fix lock ... |
824 |
mm = ctx->mm; |
1da177e4c Linux-2.6.12-rc2 |
825 |
spin_unlock_irq(&ctx->ctx_lock); |
1ebb1101c [PATCH] Fix lock ... |
826 |
unuse_mm(mm); |
1da177e4c Linux-2.6.12-rc2 |
827 828 829 830 831 |
set_fs(oldfs); /* * we're in a worker thread already, don't use queue_delayed_work, */ if (requeue) |
52bad64d9 WorkStruct: Separ... |
832 |
queue_delayed_work(aio_wq, &ctx->wq, 0); |
1da177e4c Linux-2.6.12-rc2 |
833 834 835 836 837 838 839 840 |
} /* * Called by kick_iocb to queue the kiocb for retry * and if required activate the aio work queue to process * it */ |
998765e55 [PATCH] aio: lock... |
841 |
static void try_queue_kicked_iocb(struct kiocb *iocb) |
1da177e4c Linux-2.6.12-rc2 |
842 843 844 845 |
{ struct kioctx *ctx = iocb->ki_ctx; unsigned long flags; int run = 0; |
1da177e4c Linux-2.6.12-rc2 |
846 |
spin_lock_irqsave(&ctx->ctx_lock, flags); |
998765e55 [PATCH] aio: lock... |
847 848 849 850 |
/* set this inside the lock so that we can't race with aio_run_iocb() * testing it and putting the iocb on the run list under the lock */ if (!kiocbTryKick(iocb)) run = __queue_kicked_iocb(iocb); |
1da177e4c Linux-2.6.12-rc2 |
851 |
spin_unlock_irqrestore(&ctx->ctx_lock, flags); |
644d3a088 [PATCH] aio: clea... |
852 |
if (run) |
1da177e4c Linux-2.6.12-rc2 |
853 |
aio_queue_work(ctx); |
1da177e4c Linux-2.6.12-rc2 |
854 855 856 857 858 |
} /* * kick_iocb: * Called typically from a wait queue callback context |
fac046ad0 aio: remove unuse... |
859 |
* to trigger a retry of the iocb. |
1da177e4c Linux-2.6.12-rc2 |
860 861 862 |
* The retry is usually executed by aio workqueue * threads (See aio_kick_handler). */ |
fc9b52cd8 fs: remove fastca... |
863 |
void kick_iocb(struct kiocb *iocb) |
1da177e4c Linux-2.6.12-rc2 |
864 865 866 867 868 869 870 871 |
{ /* sync iocbs are easy: they can only ever be executing from a * single context. */ if (is_sync_kiocb(iocb)) { kiocbSetKicked(iocb); wake_up_process(iocb->ki_obj.tsk); return; } |
998765e55 [PATCH] aio: lock... |
872 |
try_queue_kicked_iocb(iocb); |
1da177e4c Linux-2.6.12-rc2 |
873 874 875 876 877 878 879 880 |
} EXPORT_SYMBOL(kick_iocb); /* aio_complete * Called when the io request on the given iocb is complete. * Returns true if this is the last user of the request. The * only other user of the request can be the cancellation code. */ |
fc9b52cd8 fs: remove fastca... |
881 |
int aio_complete(struct kiocb *iocb, long res, long res2) |
1da177e4c Linux-2.6.12-rc2 |
882 883 884 885 886 887 888 889 |
{ struct kioctx *ctx = iocb->ki_ctx; struct aio_ring_info *info; struct aio_ring *ring; struct io_event *event; unsigned long flags; unsigned long tail; int ret; |
20dcae324 [PATCH] aio: remo... |
890 891 892 893 894 895 |
/* * Special case handling for sync iocbs: * - events go directly into the iocb for fast handling * - the sync task with the iocb in its stack holds the single iocb * ref, no other paths have a way to get another ref * - the sync task helpfully left a reference to itself in the iocb |
1da177e4c Linux-2.6.12-rc2 |
896 897 |
*/ if (is_sync_kiocb(iocb)) { |
20dcae324 [PATCH] aio: remo... |
898 |
BUG_ON(iocb->ki_users != 1); |
1da177e4c Linux-2.6.12-rc2 |
899 |
iocb->ki_user_data = res; |
20dcae324 [PATCH] aio: remo... |
900 |
iocb->ki_users = 0; |
1da177e4c Linux-2.6.12-rc2 |
901 |
wake_up_process(iocb->ki_obj.tsk); |
20dcae324 [PATCH] aio: remo... |
902 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 |
} info = &ctx->ring_info; /* add a completion event to the ring buffer. * must be done holding ctx->ctx_lock to prevent * other code from messing with the tail * pointer since we might be called from irq * context. */ spin_lock_irqsave(&ctx->ctx_lock, flags); if (iocb->ki_run_list.prev && !list_empty(&iocb->ki_run_list)) list_del_init(&iocb->ki_run_list); /* * cancelled requests don't get events, userland was given one * when the event got cancelled. */ if (kiocbIsCancelled(iocb)) goto put_rq; ring = kmap_atomic(info->ring_pages[0], KM_IRQ1); tail = info->tail; event = aio_ring_event(info, tail, KM_IRQ0); |
4bf69b2a0 [PATCH] aio: ring... |
929 930 |
if (++tail >= info->nr) tail = 0; |
1da177e4c Linux-2.6.12-rc2 |
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 |
event->obj = (u64)(unsigned long)iocb->ki_obj.user; event->data = iocb->ki_user_data; event->res = res; event->res2 = res2; dprintk("aio_complete: %p[%lu]: %p: %p %Lx %lx %lx ", ctx, tail, iocb, iocb->ki_obj.user, iocb->ki_user_data, res, res2); /* after flagging the request as done, we * must never even look at it again */ smp_wmb(); /* make event visible before updating tail */ info->tail = tail; ring->tail = tail; put_aio_ring_event(event, KM_IRQ0); kunmap_atomic(ring, KM_IRQ1); pr_debug("added to ring %p at [%lu] ", iocb, tail); |
8d1c98b0b eventfd/kaio inte... |
955 956 957 958 959 960 |
/* * Check if the user asked us to deliver the result through an * eventfd. The eventfd_signal() function is safe to be called * from IRQ context. */ |
87c3a86e1 eventfd: remove f... |
961 |
if (iocb->ki_eventfd != NULL) |
8d1c98b0b eventfd/kaio inte... |
962 |
eventfd_signal(iocb->ki_eventfd, 1); |
1da177e4c Linux-2.6.12-rc2 |
963 964 965 |
put_rq: /* everything turned out well, dispose of the aiocb. */ ret = __aio_put_req(ctx, iocb); |
6cb2a2104 aio: bad AIO race... |
966 967 968 969 970 971 972 |
/* * We have to order our ring_info tail store above and test * of the wait list below outside the wait lock. This is * like in wake_up_bit() where clearing a bit has to be * ordered with the unlocked test. */ smp_mb(); |
1da177e4c Linux-2.6.12-rc2 |
973 974 |
if (waitqueue_active(&ctx->wait)) wake_up(&ctx->wait); |
dee11c236 [PATCH] aio: fix ... |
975 |
spin_unlock_irqrestore(&ctx->ctx_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
976 977 |
return ret; } |
385773e04 aio.c: move EXPOR... |
978 |
EXPORT_SYMBOL(aio_complete); |
1da177e4c Linux-2.6.12-rc2 |
979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 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 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 |
/* aio_read_evt * Pull an event off of the ioctx's event ring. Returns the number of * events fetched (0 or 1 ;-) * FIXME: make this use cmpxchg. * TODO: make the ringbuffer user mmap()able (requires FIXME). */ static int aio_read_evt(struct kioctx *ioctx, struct io_event *ent) { struct aio_ring_info *info = &ioctx->ring_info; struct aio_ring *ring; unsigned long head; int ret = 0; ring = kmap_atomic(info->ring_pages[0], KM_USER0); dprintk("in aio_read_evt h%lu t%lu m%lu ", (unsigned long)ring->head, (unsigned long)ring->tail, (unsigned long)ring->nr); if (ring->head == ring->tail) goto out; spin_lock(&info->ring_lock); head = ring->head % info->nr; if (head != ring->tail) { struct io_event *evp = aio_ring_event(info, head, KM_USER1); *ent = *evp; head = (head + 1) % info->nr; smp_mb(); /* finish reading the event before updatng the head */ ring->head = head; ret = 1; put_aio_ring_event(evp, KM_USER1); } spin_unlock(&info->ring_lock); out: kunmap_atomic(ring, KM_USER0); dprintk("leaving aio_read_evt: %d h%lu t%lu ", ret, (unsigned long)ring->head, (unsigned long)ring->tail); return ret; } struct aio_timeout { struct timer_list timer; int timed_out; struct task_struct *p; }; static void timeout_func(unsigned long data) { struct aio_timeout *to = (struct aio_timeout *)data; to->timed_out = 1; wake_up_process(to->p); } static inline void init_timeout(struct aio_timeout *to) { |
c6f3a97f8 debugobjects: add... |
1040 |
setup_timer_on_stack(&to->timer, timeout_func, (unsigned long) to); |
1da177e4c Linux-2.6.12-rc2 |
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 |
to->timed_out = 0; to->p = current; } static inline void set_timeout(long start_jiffies, struct aio_timeout *to, const struct timespec *ts) { to->timer.expires = start_jiffies + timespec_to_jiffies(ts); if (time_after(to->timer.expires, jiffies)) add_timer(&to->timer); else to->timed_out = 1; } static inline void clear_timeout(struct aio_timeout *to) { del_singleshot_timer_sync(&to->timer); } static int read_events(struct kioctx *ctx, long min_nr, long nr, struct io_event __user *event, struct timespec __user *timeout) { long start_jiffies = jiffies; struct task_struct *tsk = current; DECLARE_WAITQUEUE(wait, tsk); int ret; int i = 0; struct io_event ent; struct aio_timeout to; |
1da177e4c Linux-2.6.12-rc2 |
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 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 |
int retry = 0; /* needed to zero any padding within an entry (there shouldn't be * any, but C is fun! */ memset(&ent, 0, sizeof(ent)); retry: ret = 0; while (likely(i < nr)) { ret = aio_read_evt(ctx, &ent); if (unlikely(ret <= 0)) break; dprintk("read event: %Lx %Lx %Lx %Lx ", ent.data, ent.obj, ent.res, ent.res2); /* Could we split the check in two? */ ret = -EFAULT; if (unlikely(copy_to_user(event, &ent, sizeof(ent)))) { dprintk("aio: lost an event due to EFAULT. "); break; } ret = 0; /* Good, event copied to userland, update counts. */ event ++; i ++; } if (min_nr <= i) return i; if (ret) return ret; /* End fast path */ /* racey check, but it gets redone */ if (!retry && unlikely(!list_empty(&ctx->run_list))) { retry = 1; aio_run_all_iocbs(ctx); goto retry; } init_timeout(&to); if (timeout) { struct timespec ts; ret = -EFAULT; if (unlikely(copy_from_user(&ts, timeout, sizeof(ts)))) goto out; set_timeout(start_jiffies, &to, &ts); } while (likely(i < nr)) { add_wait_queue_exclusive(&ctx->wait, &wait); do { set_task_state(tsk, TASK_INTERRUPTIBLE); ret = aio_read_evt(ctx, &ent); if (ret) break; if (min_nr <= i) break; |
e92adcba2 aio: io_getevents... |
1136 1137 1138 1139 |
if (unlikely(ctx->dead)) { ret = -EINVAL; break; } |
1da177e4c Linux-2.6.12-rc2 |
1140 1141 |
if (to.timed_out) /* Only check after read evt */ break; |
e00ba3dae aio: only account... |
1142 1143 1144 1145 1146 1147 |
/* Try to only show up in io wait if there are ops * in flight */ if (ctx->reqs_active) io_schedule(); else schedule(); |
1da177e4c Linux-2.6.12-rc2 |
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 |
if (signal_pending(tsk)) { ret = -EINTR; break; } /*ret = aio_read_evt(ctx, &ent);*/ } while (1) ; set_task_state(tsk, TASK_RUNNING); remove_wait_queue(&ctx->wait, &wait); if (unlikely(ret <= 0)) break; ret = -EFAULT; if (unlikely(copy_to_user(event, &ent, sizeof(ent)))) { dprintk("aio: lost an event due to EFAULT. "); break; } /* Good, event copied to userland, update counts. */ event ++; i ++; } if (timeout) clear_timeout(&to); out: |
c6f3a97f8 debugobjects: add... |
1176 |
destroy_timer_on_stack(&to.timer); |
1da177e4c Linux-2.6.12-rc2 |
1177 1178 1179 1180 1181 1182 1183 1184 1185 |
return i ? i : ret; } /* Take an ioctx and remove it from the list of ioctx's. Protects * against races with itself via ->dead. */ static void io_destroy(struct kioctx *ioctx) { struct mm_struct *mm = current->mm; |
1da177e4c Linux-2.6.12-rc2 |
1186 1187 1188 |
int was_dead; /* delete the entry from the list is someone else hasn't already */ |
abf137dd7 aio: make the loo... |
1189 |
spin_lock(&mm->ioctx_lock); |
1da177e4c Linux-2.6.12-rc2 |
1190 1191 |
was_dead = ioctx->dead; ioctx->dead = 1; |
abf137dd7 aio: make the loo... |
1192 1193 |
hlist_del_rcu(&ioctx->list); spin_unlock(&mm->ioctx_lock); |
1da177e4c Linux-2.6.12-rc2 |
1194 1195 1196 1197 1198 1199 1200 1201 |
dprintk("aio_release(%p) ", ioctx); if (likely(!was_dead)) put_ioctx(ioctx); /* twice for the list */ aio_cancel_all(ioctx); wait_for_all_aios(ioctx); |
e92adcba2 aio: io_getevents... |
1202 1203 1204 1205 1206 1207 |
/* * Wake up any waiters. The setting of ctx->dead must be seen * by other CPUs at this point. Right now, we rely on the * locking done by the above calls to ensure this consistency. */ |
e91f90bb0 aio: wake all wai... |
1208 |
wake_up_all(&ioctx->wait); |
1da177e4c Linux-2.6.12-rc2 |
1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 |
put_ioctx(ioctx); /* once for the lookup */ } /* sys_io_setup: * Create an aio_context capable of receiving at least nr_events. * ctxp must not point to an aio_context that already exists, and * must be initialized to 0 prior to the call. On successful * creation of the aio_context, *ctxp is filled in with the resulting * handle. May fail with -EINVAL if *ctxp is not initialized, * if the specified nr_events exceeds internal limits. May fail * with -EAGAIN if the specified nr_events exceeds the user's limit * of available events. May fail with -ENOMEM if insufficient kernel * resources are available. May fail with -EFAULT if an invalid * pointer is passed for ctxp. Will fail with -ENOSYS if not * implemented. */ |
002c8976e [CVE-2009-0029] S... |
1225 |
SYSCALL_DEFINE2(io_setup, unsigned, nr_events, aio_context_t __user *, ctxp) |
1da177e4c Linux-2.6.12-rc2 |
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 |
{ struct kioctx *ioctx = NULL; unsigned long ctx; long ret; ret = get_user(ctx, ctxp); if (unlikely(ret)) goto out; ret = -EINVAL; |
d55b5fdaf [PATCH] aio: remo... |
1236 1237 1238 1239 |
if (unlikely(ctx || nr_events == 0)) { pr_debug("EINVAL: io_setup: ctx %lu nr_events %u ", ctx, nr_events); |
1da177e4c Linux-2.6.12-rc2 |
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 |
goto out; } ioctx = ioctx_alloc(nr_events); ret = PTR_ERR(ioctx); if (!IS_ERR(ioctx)) { ret = put_user(ioctx->user_id, ctxp); if (!ret) return 0; get_ioctx(ioctx); /* io_destroy() expects us to hold a ref */ io_destroy(ioctx); } out: return ret; } /* sys_io_destroy: * Destroy the aio_context specified. May cancel any outstanding * AIOs and block on completion. Will fail with -ENOSYS if not |
642b5123a aio: fix wrong su... |
1261 |
* implemented. May fail with -EINVAL if the context pointed to |
1da177e4c Linux-2.6.12-rc2 |
1262 1263 |
* is invalid. */ |
002c8976e [CVE-2009-0029] S... |
1264 |
SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx) |
1da177e4c Linux-2.6.12-rc2 |
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 |
{ struct kioctx *ioctx = lookup_ioctx(ctx); if (likely(NULL != ioctx)) { io_destroy(ioctx); return 0; } pr_debug("EINVAL: io_destroy: invalid context id "); return -EINVAL; } |
eed4e51fb [PATCH] Add vecto... |
1275 |
static void aio_advance_iovec(struct kiocb *iocb, ssize_t ret) |
1da177e4c Linux-2.6.12-rc2 |
1276 |
{ |
eed4e51fb [PATCH] Add vecto... |
1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 |
struct iovec *iov = &iocb->ki_iovec[iocb->ki_cur_seg]; BUG_ON(ret <= 0); while (iocb->ki_cur_seg < iocb->ki_nr_segs && ret > 0) { ssize_t this = min((ssize_t)iov->iov_len, ret); iov->iov_base += this; iov->iov_len -= this; iocb->ki_left -= this; ret -= this; if (iov->iov_len == 0) { iocb->ki_cur_seg++; iov++; |
897f15fb5 [PATCH] aio: remo... |
1290 |
} |
eed4e51fb [PATCH] Add vecto... |
1291 |
} |
1da177e4c Linux-2.6.12-rc2 |
1292 |
|
eed4e51fb [PATCH] Add vecto... |
1293 1294 1295 |
/* the caller should not have done more io than what fit in * the remaining iovecs */ BUG_ON(ret > 0 && iocb->ki_left == 0); |
1da177e4c Linux-2.6.12-rc2 |
1296 |
} |
eed4e51fb [PATCH] Add vecto... |
1297 |
static ssize_t aio_rw_vect_retry(struct kiocb *iocb) |
1da177e4c Linux-2.6.12-rc2 |
1298 1299 |
{ struct file *file = iocb->ki_filp; |
eed4e51fb [PATCH] Add vecto... |
1300 1301 1302 1303 |
struct address_space *mapping = file->f_mapping; struct inode *inode = mapping->host; ssize_t (*rw_op)(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
1da177e4c Linux-2.6.12-rc2 |
1304 |
ssize_t ret = 0; |
eed4e51fb [PATCH] Add vecto... |
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 |
unsigned short opcode; if ((iocb->ki_opcode == IOCB_CMD_PREADV) || (iocb->ki_opcode == IOCB_CMD_PREAD)) { rw_op = file->f_op->aio_read; opcode = IOCB_CMD_PREADV; } else { rw_op = file->f_op->aio_write; opcode = IOCB_CMD_PWRITEV; } |
1da177e4c Linux-2.6.12-rc2 |
1315 |
|
c2ec66828 aio: negative off... |
1316 1317 1318 |
/* This matches the pread()/pwrite() logic */ if (iocb->ki_pos < 0) return -EINVAL; |
897f15fb5 [PATCH] aio: remo... |
1319 |
do { |
eed4e51fb [PATCH] Add vecto... |
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 |
ret = rw_op(iocb, &iocb->ki_iovec[iocb->ki_cur_seg], iocb->ki_nr_segs - iocb->ki_cur_seg, iocb->ki_pos); if (ret > 0) aio_advance_iovec(iocb, ret); /* retry all partial writes. retry partial reads as long as its a * regular file. */ } while (ret > 0 && iocb->ki_left > 0 && (opcode == IOCB_CMD_PWRITEV || (!S_ISFIFO(inode->i_mode) && !S_ISSOCK(inode->i_mode)))); |
1da177e4c Linux-2.6.12-rc2 |
1331 |
|
eed4e51fb [PATCH] Add vecto... |
1332 1333 |
/* This means we must have transferred all that we could */ /* No need to retry anymore */ |
1da177e4c Linux-2.6.12-rc2 |
1334 1335 |
if ((ret == 0) || (iocb->ki_left == 0)) ret = iocb->ki_nbytes - iocb->ki_left; |
7adfa2ff3 aio: partial writ... |
1336 1337 1338 1339 1340 1341 |
/* If we managed to write some out we return that, rather than * the eventual error. */ if (opcode == IOCB_CMD_PWRITEV && ret < 0 && ret != -EIOCBQUEUED && ret != -EIOCBRETRY && iocb->ki_nbytes - iocb->ki_left) ret = iocb->ki_nbytes - iocb->ki_left; |
1da177e4c Linux-2.6.12-rc2 |
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 |
return ret; } static ssize_t aio_fdsync(struct kiocb *iocb) { struct file *file = iocb->ki_filp; ssize_t ret = -EINVAL; if (file->f_op->aio_fsync) ret = file->f_op->aio_fsync(iocb, 1); return ret; } static ssize_t aio_fsync(struct kiocb *iocb) { struct file *file = iocb->ki_filp; ssize_t ret = -EINVAL; if (file->f_op->aio_fsync) ret = file->f_op->aio_fsync(iocb, 0); return ret; } |
9d85cba71 aio: fix the comp... |
1364 |
static ssize_t aio_setup_vectored_rw(int type, struct kiocb *kiocb, bool compat) |
eed4e51fb [PATCH] Add vecto... |
1365 1366 |
{ ssize_t ret; |
9d85cba71 aio: fix the comp... |
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 |
#ifdef CONFIG_COMPAT if (compat) ret = compat_rw_copy_check_uvector(type, (struct compat_iovec __user *)kiocb->ki_buf, kiocb->ki_nbytes, 1, &kiocb->ki_inline_vec, &kiocb->ki_iovec); else #endif ret = rw_copy_check_uvector(type, (struct iovec __user *)kiocb->ki_buf, kiocb->ki_nbytes, 1, &kiocb->ki_inline_vec, &kiocb->ki_iovec); |
eed4e51fb [PATCH] Add vecto... |
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 |
if (ret < 0) goto out; kiocb->ki_nr_segs = kiocb->ki_nbytes; kiocb->ki_cur_seg = 0; /* ki_nbytes/left now reflect bytes instead of segs */ kiocb->ki_nbytes = ret; kiocb->ki_left = ret; ret = 0; out: return ret; } static ssize_t aio_setup_single_vector(struct kiocb *kiocb) { kiocb->ki_iovec = &kiocb->ki_inline_vec; kiocb->ki_iovec->iov_base = kiocb->ki_buf; kiocb->ki_iovec->iov_len = kiocb->ki_left; kiocb->ki_nr_segs = 1; kiocb->ki_cur_seg = 0; |
eed4e51fb [PATCH] Add vecto... |
1400 1401 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1402 1403 1404 1405 1406 |
/* * aio_setup_iocb: * Performs the initial checks and aio retry method * setup for the kiocb at the time of io submission. */ |
9d85cba71 aio: fix the comp... |
1407 |
static ssize_t aio_setup_iocb(struct kiocb *kiocb, bool compat) |
1da177e4c Linux-2.6.12-rc2 |
1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 |
{ struct file *file = kiocb->ki_filp; ssize_t ret = 0; switch (kiocb->ki_opcode) { case IOCB_CMD_PREAD: ret = -EBADF; if (unlikely(!(file->f_mode & FMODE_READ))) break; ret = -EFAULT; if (unlikely(!access_ok(VERIFY_WRITE, kiocb->ki_buf, kiocb->ki_left))) break; |
8766ce410 [PATCH] aio sysca... |
1421 1422 1423 |
ret = security_file_permission(file, MAY_READ); if (unlikely(ret)) break; |
eed4e51fb [PATCH] Add vecto... |
1424 1425 1426 |
ret = aio_setup_single_vector(kiocb); if (ret) break; |
1da177e4c Linux-2.6.12-rc2 |
1427 1428 |
ret = -EINVAL; if (file->f_op->aio_read) |
eed4e51fb [PATCH] Add vecto... |
1429 |
kiocb->ki_retry = aio_rw_vect_retry; |
1da177e4c Linux-2.6.12-rc2 |
1430 1431 1432 1433 1434 1435 1436 1437 1438 |
break; case IOCB_CMD_PWRITE: ret = -EBADF; if (unlikely(!(file->f_mode & FMODE_WRITE))) break; ret = -EFAULT; if (unlikely(!access_ok(VERIFY_READ, kiocb->ki_buf, kiocb->ki_left))) break; |
8766ce410 [PATCH] aio sysca... |
1439 1440 1441 |
ret = security_file_permission(file, MAY_WRITE); if (unlikely(ret)) break; |
eed4e51fb [PATCH] Add vecto... |
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 |
ret = aio_setup_single_vector(kiocb); if (ret) break; ret = -EINVAL; if (file->f_op->aio_write) kiocb->ki_retry = aio_rw_vect_retry; break; case IOCB_CMD_PREADV: ret = -EBADF; if (unlikely(!(file->f_mode & FMODE_READ))) break; ret = security_file_permission(file, MAY_READ); if (unlikely(ret)) break; |
9d85cba71 aio: fix the comp... |
1456 |
ret = aio_setup_vectored_rw(READ, kiocb, compat); |
eed4e51fb [PATCH] Add vecto... |
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 |
if (ret) break; ret = -EINVAL; if (file->f_op->aio_read) kiocb->ki_retry = aio_rw_vect_retry; break; case IOCB_CMD_PWRITEV: ret = -EBADF; if (unlikely(!(file->f_mode & FMODE_WRITE))) break; ret = security_file_permission(file, MAY_WRITE); if (unlikely(ret)) break; |
9d85cba71 aio: fix the comp... |
1470 |
ret = aio_setup_vectored_rw(WRITE, kiocb, compat); |
eed4e51fb [PATCH] Add vecto... |
1471 1472 |
if (ret) break; |
1da177e4c Linux-2.6.12-rc2 |
1473 1474 |
ret = -EINVAL; if (file->f_op->aio_write) |
eed4e51fb [PATCH] Add vecto... |
1475 |
kiocb->ki_retry = aio_rw_vect_retry; |
1da177e4c Linux-2.6.12-rc2 |
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 |
break; case IOCB_CMD_FDSYNC: ret = -EINVAL; if (file->f_op->aio_fsync) kiocb->ki_retry = aio_fdsync; break; case IOCB_CMD_FSYNC: ret = -EINVAL; if (file->f_op->aio_fsync) kiocb->ki_retry = aio_fsync; break; default: dprintk("EINVAL: io_submit: no operation provided "); ret = -EINVAL; } if (!kiocb->ki_retry) return ret; return 0; } |
d5470b596 fs/aio.c: make 3 ... |
1498 |
static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, |
cf15900e1 aio: remove reque... |
1499 |
struct iocb *iocb, bool compat) |
1da177e4c Linux-2.6.12-rc2 |
1500 1501 1502 1503 1504 1505 |
{ struct kiocb *req; struct file *file; ssize_t ret; /* enforce forwards compatibility on users */ |
9c3060bed signal/timer/even... |
1506 |
if (unlikely(iocb->aio_reserved1 || iocb->aio_reserved2)) { |
1da177e4c Linux-2.6.12-rc2 |
1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 |
pr_debug("EINVAL: io_submit: reserve field set "); return -EINVAL; } /* prevent overflows */ if (unlikely( (iocb->aio_buf != (unsigned long)iocb->aio_buf) || (iocb->aio_nbytes != (size_t)iocb->aio_nbytes) || ((ssize_t)iocb->aio_nbytes < 0) )) { pr_debug("EINVAL: io_submit: overflow check "); return -EINVAL; } file = fget(iocb->aio_fildes); if (unlikely(!file)) return -EBADF; req = aio_get_req(ctx); /* returns with 2 references to req */ if (unlikely(!req)) { fput(file); return -EAGAIN; } |
87e2831c3 AIO: fix cleanup ... |
1532 |
req->ki_filp = file; |
9c3060bed signal/timer/even... |
1533 1534 1535 1536 1537 1538 1539 |
if (iocb->aio_flags & IOCB_FLAG_RESFD) { /* * If the IOCB_FLAG_RESFD flag of aio_flags is set, get an * instance of the file* now. The file descriptor must be * an eventfd() fd, and will be signaled for each completed * event using the eventfd_signal() function. */ |
133890103 eventfd: revised ... |
1540 |
req->ki_eventfd = eventfd_ctx_fdget((int) iocb->aio_resfd); |
801678c5a Remove duplicated... |
1541 |
if (IS_ERR(req->ki_eventfd)) { |
9c3060bed signal/timer/even... |
1542 |
ret = PTR_ERR(req->ki_eventfd); |
87c3a86e1 eventfd: remove f... |
1543 |
req->ki_eventfd = NULL; |
9c3060bed signal/timer/even... |
1544 1545 1546 |
goto out_put_req; } } |
1da177e4c Linux-2.6.12-rc2 |
1547 |
|
212079cf4 [PATCH] aio: remo... |
1548 |
ret = put_user(req->ki_key, &user_iocb->aio_key); |
1da177e4c Linux-2.6.12-rc2 |
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 |
if (unlikely(ret)) { dprintk("EFAULT: aio_key "); goto out_put_req; } req->ki_obj.user = user_iocb; req->ki_user_data = iocb->aio_data; req->ki_pos = iocb->aio_offset; req->ki_buf = (char __user *)(unsigned long)iocb->aio_buf; req->ki_left = req->ki_nbytes = iocb->aio_nbytes; req->ki_opcode = iocb->aio_lio_opcode; |
1da177e4c Linux-2.6.12-rc2 |
1562 |
|
9d85cba71 aio: fix the comp... |
1563 |
ret = aio_setup_iocb(req, compat); |
1da177e4c Linux-2.6.12-rc2 |
1564 1565 1566 1567 1568 |
if (ret) goto out_put_req; spin_lock_irq(&ctx->ctx_lock); |
7137c6bd4 aio: fix race bet... |
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 |
/* * We could have raced with io_destroy() and are currently holding a * reference to ctx which should be destroyed. We cannot submit IO * since ctx gets freed as soon as io_submit() puts its reference. The * check here is reliable: io_destroy() sets ctx->dead before waiting * for outstanding IO and the barrier between these two is realized by * unlock of mm->ioctx_lock and lock of ctx->ctx_lock. Analogously we * increment ctx->reqs_active before checking for ctx->dead and the * barrier is realized by unlock and lock of ctx->ctx_lock. Thus if we * don't see ctx->dead set here, io_destroy() waits for our IO to * finish. */ if (ctx->dead) { spin_unlock_irq(&ctx->ctx_lock); ret = -EINVAL; goto out_put_req; } |
ac0b1bc1e [PATCH] aio: kioc... |
1586 |
aio_run_iocb(req); |
ac0b1bc1e [PATCH] aio: kioc... |
1587 |
if (!list_empty(&ctx->run_list)) { |
954d3e953 [PATCH] aio: opti... |
1588 1589 1590 1591 |
/* drain the run list */ while (__aio_run_iocbs(ctx)) ; } |
1da177e4c Linux-2.6.12-rc2 |
1592 |
spin_unlock_irq(&ctx->ctx_lock); |
cfb1e33ee aio: implement re... |
1593 |
|
1da177e4c Linux-2.6.12-rc2 |
1594 1595 1596 1597 1598 1599 1600 1601 |
aio_put_req(req); /* drop extra ref to req */ return 0; out_put_req: aio_put_req(req); /* drop extra ref to req */ aio_put_req(req); /* drop i/o ref to req */ return ret; } |
9d85cba71 aio: fix the comp... |
1602 1603 |
long do_io_submit(aio_context_t ctx_id, long nr, struct iocb __user *__user *iocbpp, bool compat) |
1da177e4c Linux-2.6.12-rc2 |
1604 1605 1606 1607 |
{ struct kioctx *ctx; long ret = 0; int i; |
9f5b94254 fs: make aio plug |
1608 |
struct blk_plug plug; |
1da177e4c Linux-2.6.12-rc2 |
1609 1610 1611 |
if (unlikely(nr < 0)) return -EINVAL; |
75e1c70fc aio: check for mu... |
1612 1613 |
if (unlikely(nr > LONG_MAX/sizeof(*iocbpp))) nr = LONG_MAX/sizeof(*iocbpp); |
1da177e4c Linux-2.6.12-rc2 |
1614 1615 1616 1617 1618 1619 1620 1621 1622 |
if (unlikely(!access_ok(VERIFY_READ, iocbpp, (nr*sizeof(*iocbpp))))) return -EFAULT; ctx = lookup_ioctx(ctx_id); if (unlikely(!ctx)) { pr_debug("EINVAL: io_submit: invalid context id "); return -EINVAL; } |
9f5b94254 fs: make aio plug |
1623 |
blk_start_plug(&plug); |
1da177e4c Linux-2.6.12-rc2 |
1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 |
/* * AKPM: should this return a partial result if some of the IOs were * successfully submitted? */ for (i=0; i<nr; i++) { struct iocb __user *user_iocb; struct iocb tmp; if (unlikely(__get_user(user_iocb, iocbpp + i))) { ret = -EFAULT; break; } if (unlikely(copy_from_user(&tmp, user_iocb, sizeof(tmp)))) { ret = -EFAULT; break; } |
cf15900e1 aio: remove reque... |
1641 |
ret = io_submit_one(ctx, user_iocb, &tmp, compat); |
1da177e4c Linux-2.6.12-rc2 |
1642 1643 1644 |
if (ret) break; } |
9f5b94254 fs: make aio plug |
1645 |
blk_finish_plug(&plug); |
1da177e4c Linux-2.6.12-rc2 |
1646 1647 1648 1649 |
put_ioctx(ctx); return i ? i : ret; } |
9d85cba71 aio: fix the comp... |
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/* sys_io_submit: * Queue the nr iocbs pointed to by iocbpp for processing. Returns * the number of iocbs queued. May return -EINVAL if the aio_context * specified by ctx_id is invalid, if nr is < 0, if the iocb at * *iocbpp[0] is not properly initialized, if the operation specified * is invalid for the file descriptor in the iocb. May fail with * -EFAULT if any of the data structures point to invalid data. May * fail with -EBADF if the file descriptor specified in the first * iocb is invalid. May fail with -EAGAIN if insufficient resources * are available to queue any iocbs. Will return 0 if nr is 0. Will * fail with -ENOSYS if not implemented. */ SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr, struct iocb __user * __user *, iocbpp) { return do_io_submit(ctx_id, nr, iocbpp, 0); } |
1da177e4c Linux-2.6.12-rc2 |
1667 1668 |
/* lookup_kiocb * Finds a given iocb for cancellation. |
1da177e4c Linux-2.6.12-rc2 |
1669 |
*/ |
25ee7e383 [PATCH] fs/aio.c:... |
1670 1671 |
static struct kiocb *lookup_kiocb(struct kioctx *ctx, struct iocb __user *iocb, u32 key) |
1da177e4c Linux-2.6.12-rc2 |
1672 1673 |
{ struct list_head *pos; |
d00689af6 [PATCH] aio: repl... |
1674 1675 |
assert_spin_locked(&ctx->ctx_lock); |
1da177e4c Linux-2.6.12-rc2 |
1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 |
/* TODO: use a hash or array, this sucks. */ list_for_each(pos, &ctx->active_reqs) { struct kiocb *kiocb = list_kiocb(pos); if (kiocb->ki_obj.user == iocb && kiocb->ki_key == key) return kiocb; } return NULL; } /* sys_io_cancel: * Attempts to cancel an iocb previously passed to io_submit. If * the operation is successfully cancelled, the resulting event is * copied into the memory pointed to by result without being placed * into the completion queue and 0 is returned. May fail with * -EFAULT if any of the data structures pointed to are invalid. * May fail with -EINVAL if aio_context specified by ctx_id is * invalid. May fail with -EAGAIN if the iocb specified was not * cancelled. Will fail with -ENOSYS if not implemented. */ |
002c8976e [CVE-2009-0029] S... |
1695 1696 |
SYSCALL_DEFINE3(io_cancel, aio_context_t, ctx_id, struct iocb __user *, iocb, struct io_event __user *, result) |
1da177e4c Linux-2.6.12-rc2 |
1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 |
{ int (*cancel)(struct kiocb *iocb, struct io_event *res); struct kioctx *ctx; struct kiocb *kiocb; u32 key; int ret; ret = get_user(key, &iocb->aio_key); if (unlikely(ret)) return -EFAULT; ctx = lookup_ioctx(ctx_id); if (unlikely(!ctx)) return -EINVAL; spin_lock_irq(&ctx->ctx_lock); ret = -EAGAIN; kiocb = lookup_kiocb(ctx, iocb, key); if (kiocb && kiocb->ki_cancel) { cancel = kiocb->ki_cancel; kiocb->ki_users ++; kiocbSetCancelled(kiocb); } else cancel = NULL; spin_unlock_irq(&ctx->ctx_lock); if (NULL != cancel) { struct io_event tmp; pr_debug("calling cancel "); memset(&tmp, 0, sizeof(tmp)); tmp.obj = (u64)(unsigned long)kiocb->ki_obj.user; tmp.data = kiocb->ki_user_data; ret = cancel(kiocb, &tmp); if (!ret) { /* Cancellation succeeded -- copy the result * into the user's buffer. */ if (copy_to_user(result, &tmp, sizeof(tmp))) ret = -EFAULT; } } else |
8f58202bf [PATCH] change io... |
1739 |
ret = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1740 1741 1742 1743 1744 1745 1746 1747 |
put_ioctx(ctx); return ret; } /* io_getevents: * Attempts to read at least min_nr events and up to nr events from |
642b5123a aio: fix wrong su... |
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* the completion queue for the aio_context specified by ctx_id. If * it succeeds, the number of read events is returned. May fail with * -EINVAL if ctx_id is invalid, if min_nr is out of range, if nr is * out of range, if timeout is out of range. May fail with -EFAULT * if any of the memory specified is invalid. May return 0 or * < min_nr if the timeout specified by timeout has elapsed * before sufficient events are available, where timeout == NULL * specifies an infinite timeout. Note that the timeout pointed to by * timeout is relative and will be updated if not NULL and the * operation blocks. Will fail with -ENOSYS if not implemented. |
1da177e4c Linux-2.6.12-rc2 |
1758 |
*/ |
002c8976e [CVE-2009-0029] S... |
1759 1760 1761 1762 1763 |
SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id, long, min_nr, long, nr, struct io_event __user *, events, struct timespec __user *, timeout) |
1da177e4c Linux-2.6.12-rc2 |
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{ struct kioctx *ioctx = lookup_ioctx(ctx_id); long ret = -EINVAL; if (likely(ioctx)) { |
2e4102559 aio: remove unnec... |
1769 |
if (likely(min_nr <= nr && min_nr >= 0)) |
1da177e4c Linux-2.6.12-rc2 |
1770 1771 1772 |
ret = read_events(ioctx, min_nr, nr, events, timeout); put_ioctx(ioctx); } |
598af051a asmlinkage_protec... |
1773 |
asmlinkage_protect(5, ret, ctx_id, min_nr, nr, events, timeout); |
1da177e4c Linux-2.6.12-rc2 |
1774 1775 |
return ret; } |