Add pollfs_fs.h header which contains the kernel-side declarations
and auxiliary macros for type safety checks. Those macros can be
simplified later.
Signed-off-by: Davi E. M. Arnaut <[email protected]>
---
include/linux/pollfs_fs.h | 57 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
Index: linux-2.6/include/linux/pollfs_fs.h
===================================================================
--- /dev/null
+++ linux-2.6/include/linux/pollfs_fs.h
@@ -0,0 +1,57 @@
+/*
+ * pollfs, a naive filesystem for pollable (waitable) files (objects)
+ *
+ * Copyright (C) 2007 Davi E. M. Arnaut
+ *
+ */
+
+#ifndef _LINUX_POLL_FS_H
+#define _LINUX_POLL_FS_H
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/dcache.h>
+#include <linux/fs.h>
+
+#define PFS_CHECK_CALLBACK_1(f, a) (void*) \
+ (sizeof((f)((typeof(a *))0)))
+
+#define PFS_CHECK_CALLBACK_2(f, a, b) (void*) \
+ (sizeof((f)((typeof(a *))0, (typeof(b*))0)))
+
+#define PFS_WRITE(func, type, utype) \
+ (ssize_t (*)(void *, const void __user *)) \
+ (0 ? PFS_CHECK_CALLBACK_2(func, type, utype) : func)
+
+#define PFS_READ(func, type, utype) \
+ (ssize_t (*)(void *, void __user *)) \
+ (0 ? PFS_CHECK_CALLBACK_2(func, type, utype) : func)
+
+#define PFS_POLL(func, type) \
+ (int (*)(void *))(0 ? PFS_CHECK_CALLBACK_1(func, type) : func)
+
+#define PFS_RELEASE(func, type) \
+ (int (*)(void *))(0 ? PFS_CHECK_CALLBACK_1(func, type) : func)
+
+struct pfs_operations {
+ ssize_t (*read)(void *, void __user *);
+ ssize_t (*write)(void *, const void __user *);
+ int (*mmap)(void *, struct vm_area_struct *);
+ int (*poll)(void *);
+ int (*release)(void *);
+ size_t rsize;
+ size_t wsize;
+};
+
+struct pfs_file {
+ void *data;
+ wait_queue_head_t *wait;
+ const struct pfs_operations *fops;
+};
+
+long pfs_open(struct pfs_file *pfs);
+
+#endif /* __KERNEL __ */
+
+#endif /* _LINUX_POLLFS_FS_H */
--
-
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