aio: move private stuff out of aio.h

[karo-tx-linux.git] / fs / aio.c

diff --git a/fs/aio.c b/fs/aio.c
index 601c790182441a2abdd1079c265d485036f3ba97..ceaf21c4461819ac98bba80d603495e47a8c94f1 100644 (file)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -45,6 +45,67 @@
 #define dprintk(x...)  do { ; } while (0)
 #endif
 
+#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_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];
+};
+
+static inline unsigned aio_ring_avail(struct aio_ring_info *info,
+                                       struct aio_ring *ring)
+{
+       return (ring->head + info->nr - 1 - ring->tail) % info->nr;
+}
+
+struct kioctx {
+       atomic_t                users;
+       int                     dead;
+
+       /* 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 */
+
+       /* sys_io_setup currently limits this to an unsigned int */
+       unsigned                max_reqs;
+
+       struct aio_ring_info    ring_info;
+
+       struct rcu_head         rcu_head;
+};
+
 /*------ sysctl variables----*/
 static DEFINE_SPINLOCK(aio_nr_lock);
 unsigned long aio_nr;          /* current system wide number of aio requests */