vserver 1.9.5.x5

[linux-2.6.git] / include / linux / pagemap.h

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index e5acf35..c394c0c 100644 (file)
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -8,6 +8,7 @@
 #include <linux/fs.h>
 #include <linux/list.h>
 #include <linux/highmem.h>
+#include <linux/compiler.h>
 #include <asm/uaccess.h>
 #include <linux/gfp.h>
 
@@ -136,7 +137,18 @@ static inline void pagecache_acct(int count)
 
 static inline unsigned long get_page_cache_size(void)
 {
-        return atomic_read(&nr_pagecache);
+       int ret = atomic_read(&nr_pagecache);
+       if (unlikely(ret < 0))
+               ret = 0;
+       return ret;
+}
+
+/*
+ * Return byte-offset into filesystem object for page.
+ */
+static inline loff_t page_offset(struct page *page)
+{
+       return ((loff_t)page->index) << PAGE_CACHE_SHIFT;
 }
 
 static inline pgoff_t linear_page_index(struct vm_area_struct *vma,
@@ -152,6 +164,7 @@ extern void FASTCALL(unlock_page(struct page *page));
 
 static inline void lock_page(struct page *page)
 {
+       might_sleep();
        if (TestSetPageLocked(page))
                __lock_page(page);
 }
@@ -220,13 +233,13 @@ static inline void fault_in_pages_readable(const char __user *uaddr, int size)
        volatile char c;
        int ret;
 
-       ret = __get_user(c, (char *)uaddr);
+       ret = __get_user(c, uaddr);
        if (ret == 0) {
                const char __user *end = uaddr + size - 1;
 
                if (((unsigned long)uaddr & PAGE_MASK) !=
                                ((unsigned long)end & PAGE_MASK))
-                       __get_user(c, (char *)end);
+                       __get_user(c, end);
        }
 }