Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 201 insertions, 0 deletions

diff --git a/include/linux/aio.h b/include/linux/aio.h
new file mode 100644
index 000000000000..a4d5af907f90
--- /dev/null
+++ b/include/linux/aio.h
@@ -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 */