Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
201
include/linux/aio.h
Normal file
201
include/linux/aio.h
Normal file
@ -0,0 +1,201 @@
|
||||
#ifndef __LINUX__AIO_H
|
||||
#define __LINUX__AIO_H
|
||||
|
||||
#include <linux/list.h>
|
||||
#include <linux/workqueue.h>
|
||||
#include <linux/aio_abi.h>
|
||||
|
||||
#include <asm/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 */
|
||||
#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)
|
||||
|
||||
struct kiocb {
|
||||
struct list_head ki_run_list;
|
||||
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 *);
|
||||
|
||||
struct list_head ki_list; /* the aio core uses this
|
||||
* for cancellation */
|
||||
|
||||
union {
|
||||
void __user *user;
|
||||
struct task_struct *tsk;
|
||||
} ki_obj;
|
||||
__u64 ki_user_data; /* user's data for completion */
|
||||
loff_t ki_pos;
|
||||
/* 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 */
|
||||
wait_queue_t ki_wait;
|
||||
long ki_retried; /* just for testing */
|
||||
long ki_kicked; /* just for testing */
|
||||
long ki_queued; /* just for testing */
|
||||
|
||||
void *private;
|
||||
};
|
||||
|
||||
#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 = &tsk->active_mm->default_kioctx; \
|
||||
(x)->ki_cancel = NULL; \
|
||||
(x)->ki_dtor = NULL; \
|
||||
(x)->ki_obj.tsk = tsk; \
|
||||
(x)->ki_user_data = 0; \
|
||||
init_wait((&(x)->ki_wait)); \
|
||||
} 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 kioctx *next;
|
||||
|
||||
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 */
|
||||
|
||||
unsigned max_reqs;
|
||||
|
||||
struct aio_ring_info ring_info;
|
||||
|
||||
struct work_struct wq;
|
||||
};
|
||||
|
||||
/* prototypes */
|
||||
extern unsigned aio_max_size;
|
||||
|
||||
extern ssize_t FASTCALL(wait_on_sync_kiocb(struct kiocb *iocb));
|
||||
extern int FASTCALL(aio_put_req(struct kiocb *iocb));
|
||||
extern void FASTCALL(kick_iocb(struct kiocb *iocb));
|
||||
extern int FASTCALL(aio_complete(struct kiocb *iocb, long res, long res2));
|
||||
extern void FASTCALL(__put_ioctx(struct kioctx *ctx));
|
||||
struct mm_struct;
|
||||
extern void FASTCALL(exit_aio(struct mm_struct *mm));
|
||||
extern struct kioctx *lookup_ioctx(unsigned long ctx_id);
|
||||
extern int FASTCALL(io_submit_one(struct kioctx *ctx,
|
||||
struct iocb __user *user_iocb, struct iocb *iocb));
|
||||
|
||||
/* semi private, but used by the 32bit emulations: */
|
||||
struct kioctx *lookup_ioctx(unsigned long ctx_id);
|
||||
int FASTCALL(io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
|
||||
struct iocb *iocb));
|
||||
|
||||
#define get_ioctx(kioctx) do { if (unlikely(atomic_read(&(kioctx)->users) <= 0)) BUG(); atomic_inc(&(kioctx)->users); } while (0)
|
||||
#define put_ioctx(kioctx) do { if (unlikely(atomic_dec_and_test(&(kioctx)->users))) __put_ioctx(kioctx); else if (unlikely(atomic_read(&(kioctx)->users) < 0)) BUG(); } while (0)
|
||||
|
||||
#define in_aio() !is_sync_wait(current->io_wait)
|
||||
/* may be used for debugging */
|
||||
#define warn_if_async() \
|
||||
do { \
|
||||
if (in_aio()) { \
|
||||
printk(KERN_ERR "%s(%s:%d) called in async context!\n", \
|
||||
__FUNCTION__, __FILE__, __LINE__); \
|
||||
dump_stack(); \
|
||||
} \
|
||||
} while (0)
|
||||
|
||||
#define io_wait_to_kiocb(wait) container_of(wait, struct kiocb, ki_wait)
|
||||
#define is_retried_kiocb(iocb) ((iocb)->ki_retried > 1)
|
||||
|
||||
#include <linux/aio_abi.h>
|
||||
|
||||
static inline struct kiocb *list_kiocb(struct list_head *h)
|
||||
{
|
||||
return list_entry(h, struct kiocb, ki_list);
|
||||
}
|
||||
|
||||
/* for sysctl: */
|
||||
extern atomic_t aio_nr;
|
||||
extern unsigned aio_max_nr;
|
||||
|
||||
#endif /* __LINUX__AIO_H */
|
||||
Reference in New Issue
Block a user