diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/aio.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/aio.h | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/ANDROID_3.4.5/include/linux/aio.h b/ANDROID_3.4.5/include/linux/aio.h deleted file mode 100644 index b1a520ec..00000000 --- a/ANDROID_3.4.5/include/linux/aio.h +++ /dev/null @@ -1,240 +0,0 @@ -#ifndef __LINUX__AIO_H -#define __LINUX__AIO_H - -#include <linux/list.h> -#include <linux/workqueue.h> -#include <linux/aio_abi.h> -#include <linux/uio.h> -#include <linux/rcupdate.h> - -#include <linux/atomic.h> - -#define AIO_MAXSEGS 4 -#define AIO_KIOGRP_NR_ATOMIC 8 - -struct kioctx; - -/* Notes on cancelling a kiocb: - * If a kiocb is cancelled, aio_complete may return 0 to indicate - * that cancel has not yet disposed of the kiocb. All cancel - * operations *must* call aio_put_req to dispose of the kiocb - * to guard against races with the completion code. - */ -#define KIOCB_C_CANCELLED 0x01 -#define KIOCB_C_COMPLETE 0x02 - -#define KIOCB_SYNC_KEY (~0U) - -/* ki_flags bits */ -/* - * This may be used for cancel/retry serialization in the future, but - * for now it's unused and we probably don't want modules to even - * think they can use it. - */ -/* #define KIF_LOCKED 0 */ -#define KIF_KICKED 1 -#define KIF_CANCELLED 2 - -#define kiocbTryLock(iocb) test_and_set_bit(KIF_LOCKED, &(iocb)->ki_flags) -#define kiocbTryKick(iocb) test_and_set_bit(KIF_KICKED, &(iocb)->ki_flags) - -#define kiocbSetLocked(iocb) set_bit(KIF_LOCKED, &(iocb)->ki_flags) -#define kiocbSetKicked(iocb) set_bit(KIF_KICKED, &(iocb)->ki_flags) -#define kiocbSetCancelled(iocb) set_bit(KIF_CANCELLED, &(iocb)->ki_flags) - -#define kiocbClearLocked(iocb) clear_bit(KIF_LOCKED, &(iocb)->ki_flags) -#define kiocbClearKicked(iocb) clear_bit(KIF_KICKED, &(iocb)->ki_flags) -#define kiocbClearCancelled(iocb) clear_bit(KIF_CANCELLED, &(iocb)->ki_flags) - -#define kiocbIsLocked(iocb) test_bit(KIF_LOCKED, &(iocb)->ki_flags) -#define kiocbIsKicked(iocb) test_bit(KIF_KICKED, &(iocb)->ki_flags) -#define kiocbIsCancelled(iocb) test_bit(KIF_CANCELLED, &(iocb)->ki_flags) - -/* is there a better place to document function pointer methods? */ -/** - * ki_retry - iocb forward progress callback - * @kiocb: The kiocb struct to advance by performing an operation. - * - * This callback is called when the AIO core wants a given AIO operation - * to make forward progress. The kiocb argument describes the operation - * that is to be performed. As the operation proceeds, perhaps partially, - * ki_retry is expected to update the kiocb with progress made. Typically - * ki_retry is set in the AIO core and it itself calls file_operations - * helpers. - * - * ki_retry's return value determines when the AIO operation is completed - * and an event is generated in the AIO event ring. Except the special - * return values described below, the value that is returned from ki_retry - * is transferred directly into the completion ring as the operation's - * resulting status. Once this has happened ki_retry *MUST NOT* reference - * the kiocb pointer again. - * - * If ki_retry returns -EIOCBQUEUED it has made a promise that aio_complete() - * will be called on the kiocb pointer in the future. The AIO core will - * not ask the method again -- ki_retry must ensure forward progress. - * aio_complete() must be called once and only once in the future, multiple - * calls may result in undefined behaviour. - * - * If ki_retry returns -EIOCBRETRY it has made a promise that kick_iocb() - * will be called on the kiocb pointer in the future. This may happen - * through generic helpers that associate kiocb->ki_wait with a wait - * queue head that ki_retry uses via current->io_wait. It can also happen - * with custom tracking and manual calls to kick_iocb(), though that is - * discouraged. In either case, kick_iocb() must be called once and only - * once. ki_retry must ensure forward progress, the AIO core will wait - * indefinitely for kick_iocb() to be called. - */ -struct kiocb { - struct list_head ki_run_list; - unsigned long ki_flags; - int ki_users; - unsigned ki_key; /* id of this request */ - - struct file *ki_filp; - struct kioctx *ki_ctx; /* may be NULL for sync ops */ - int (*ki_cancel)(struct kiocb *, struct io_event *); - ssize_t (*ki_retry)(struct kiocb *); - void (*ki_dtor)(struct kiocb *); - - union { - void __user *user; - struct task_struct *tsk; - } ki_obj; - - __u64 ki_user_data; /* user's data for completion */ - loff_t ki_pos; - - void *private; - /* State that we remember to be able to restart/retry */ - unsigned short ki_opcode; - size_t ki_nbytes; /* copy of iocb->aio_nbytes */ - char __user *ki_buf; /* remaining iocb->aio_buf */ - size_t ki_left; /* remaining bytes */ - struct iovec ki_inline_vec; /* inline vector */ - struct iovec *ki_iovec; - unsigned long ki_nr_segs; - unsigned long ki_cur_seg; - - struct list_head ki_list; /* the aio core uses this - * for cancellation */ - struct list_head ki_batch; /* batch allocation */ - - /* - * If the aio_resfd field of the userspace iocb is not zero, - * this is the underlying eventfd context to deliver events to. - */ - struct eventfd_ctx *ki_eventfd; -}; - -#define is_sync_kiocb(iocb) ((iocb)->ki_key == KIOCB_SYNC_KEY) -#define init_sync_kiocb(x, filp) \ - do { \ - struct task_struct *tsk = current; \ - (x)->ki_flags = 0; \ - (x)->ki_users = 1; \ - (x)->ki_key = KIOCB_SYNC_KEY; \ - (x)->ki_filp = (filp); \ - (x)->ki_ctx = NULL; \ - (x)->ki_cancel = NULL; \ - (x)->ki_retry = NULL; \ - (x)->ki_dtor = NULL; \ - (x)->ki_obj.tsk = tsk; \ - (x)->ki_user_data = 0; \ - (x)->private = NULL; \ - } while (0) - -#define AIO_RING_MAGIC 0xa10a10a1 -#define AIO_RING_COMPAT_FEATURES 1 -#define AIO_RING_INCOMPAT_FEATURES 0 -struct aio_ring { - unsigned id; /* kernel internal index number */ - unsigned nr; /* number of io_events */ - unsigned head; - unsigned tail; - - unsigned magic; - unsigned compat_features; - unsigned incompat_features; - unsigned header_length; /* size of aio_ring */ - - - struct io_event io_events[0]; -}; /* 128 bytes + ring size */ - -#define aio_ring_avail(info, ring) (((ring)->head + (info)->nr - 1 - (ring)->tail) % (info)->nr) - -#define AIO_RING_PAGES 8 -struct aio_ring_info { - unsigned long mmap_base; - unsigned long mmap_size; - - struct page **ring_pages; - spinlock_t ring_lock; - long nr_pages; - - unsigned nr, tail; - - struct page *internal_pages[AIO_RING_PAGES]; -}; - -struct kioctx { - atomic_t users; - int dead; - struct mm_struct *mm; - - /* This needs improving */ - unsigned long user_id; - struct hlist_node list; - - wait_queue_head_t wait; - - spinlock_t ctx_lock; - - int reqs_active; - struct list_head active_reqs; /* used for cancellation */ - struct list_head run_list; /* used for kicked reqs */ - - /* sys_io_setup currently limits this to an unsigned int */ - unsigned max_reqs; - - struct aio_ring_info ring_info; - - struct delayed_work wq; - - struct rcu_head rcu_head; -}; - -/* prototypes */ -extern unsigned aio_max_size; - -#ifdef CONFIG_AIO -extern ssize_t wait_on_sync_kiocb(struct kiocb *iocb); -extern int aio_put_req(struct kiocb *iocb); -extern void kick_iocb(struct kiocb *iocb); -extern int aio_complete(struct kiocb *iocb, long res, long res2); -struct mm_struct; -extern void exit_aio(struct mm_struct *mm); -extern long do_io_submit(aio_context_t ctx_id, long nr, - struct iocb __user *__user *iocbpp, bool compat); -#else -static inline ssize_t wait_on_sync_kiocb(struct kiocb *iocb) { return 0; } -static inline int aio_put_req(struct kiocb *iocb) { return 0; } -static inline void kick_iocb(struct kiocb *iocb) { } -static inline int aio_complete(struct kiocb *iocb, long res, long res2) { return 0; } -struct mm_struct; -static inline void exit_aio(struct mm_struct *mm) { } -static inline long do_io_submit(aio_context_t ctx_id, long nr, - struct iocb __user * __user *iocbpp, - bool compat) { return 0; } -#endif /* CONFIG_AIO */ - -static inline struct kiocb *list_kiocb(struct list_head *h) -{ - return list_entry(h, struct kiocb, ki_list); -} - -/* for sysctl: */ -extern unsigned long aio_nr; -extern unsigned long aio_max_nr; - -#endif /* __LINUX__AIO_H */ |