xfs: remove old vmap cache
[linux-2.6.git] / fs / libfs.c
index 6e8d17e..9e50bcf 100644 (file)
@@ -338,28 +338,14 @@ int simple_readpage(struct file *file, struct page *page)
        return 0;
 }
 
-int simple_prepare_write(struct file *file, struct page *page,
-                       unsigned from, unsigned to)
-{
-       if (!PageUptodate(page)) {
-               if (to - from != PAGE_CACHE_SIZE)
-                       zero_user_segments(page,
-                               0, from,
-                               to, PAGE_CACHE_SIZE);
-       }
-       return 0;
-}
-
 int simple_write_begin(struct file *file, struct address_space *mapping,
                        loff_t pos, unsigned len, unsigned flags,
                        struct page **pagep, void **fsdata)
 {
        struct page *page;
        pgoff_t index;
-       unsigned from;
 
        index = pos >> PAGE_CACHE_SHIFT;
-       from = pos & (PAGE_CACHE_SIZE - 1);
 
        page = grab_cache_page_write_begin(mapping, index, flags);
        if (!page)
@@ -367,43 +353,59 @@ int simple_write_begin(struct file *file, struct address_space *mapping,
 
        *pagep = page;
 
-       return simple_prepare_write(file, page, from, from+len);
-}
-
-static int simple_commit_write(struct file *file, struct page *page,
-                              unsigned from, unsigned to)
-{
-       struct inode *inode = page->mapping->host;
-       loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
+       if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
+               unsigned from = pos & (PAGE_CACHE_SIZE - 1);
 
-       if (!PageUptodate(page))
-               SetPageUptodate(page);
-       /*
-        * No need to use i_size_read() here, the i_size
-        * cannot change under us because we hold the i_mutex.
-        */
-       if (pos > inode->i_size)
-               i_size_write(inode, pos);
-       set_page_dirty(page);
+               zero_user_segments(page, 0, from, from + len, PAGE_CACHE_SIZE);
+       }
        return 0;
 }
 
+/**
+ * simple_write_end - .write_end helper for non-block-device FSes
+ * @available: See .write_end of address_space_operations
+ * @file:              "
+ * @mapping:           "
+ * @pos:               "
+ * @len:               "
+ * @copied:            "
+ * @page:              "
+ * @fsdata:            "
+ *
+ * simple_write_end does the minimum needed for updating a page after writing is
+ * done. It has the same API signature as the .write_end of
+ * address_space_operations vector. So it can just be set onto .write_end for
+ * FSes that don't need any other processing. i_mutex is assumed to be held.
+ * Block based filesystems should use generic_write_end().
+ * NOTE: Even though i_size might get updated by this function, mark_inode_dirty
+ * is not called, so a filesystem that actually does store data in .write_inode
+ * should extend on what's done here with a call to mark_inode_dirty() in the
+ * case that i_size has changed.
+ */
 int simple_write_end(struct file *file, struct address_space *mapping,
                        loff_t pos, unsigned len, unsigned copied,
                        struct page *page, void *fsdata)
 {
-       unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+       struct inode *inode = page->mapping->host;
+       loff_t last_pos = pos + copied;
 
        /* zero the stale part of the page if we did a short copy */
        if (copied < len) {
-               void *kaddr = kmap_atomic(page, KM_USER0);
-               memset(kaddr + from + copied, 0, len - copied);
-               flush_dcache_page(page);
-               kunmap_atomic(kaddr, KM_USER0);
+               unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+
+               zero_user(page, from + copied, len - copied);
        }
 
-       simple_commit_write(file, page, from, from+copied);
+       if (!PageUptodate(page))
+               SetPageUptodate(page);
+       /*
+        * No need to use i_size_read() here, the i_size
+        * cannot change under us because we hold the i_mutex.
+        */
+       if (last_pos > inode->i_size)
+               i_size_write(inode, last_pos);
 
+       set_page_dirty(page);
        unlock_page(page);
        page_cache_release(page);
 
@@ -853,7 +855,6 @@ EXPORT_SYMBOL(simple_getattr);
 EXPORT_SYMBOL(simple_link);
 EXPORT_SYMBOL(simple_lookup);
 EXPORT_SYMBOL(simple_pin_fs);
-EXPORT_UNUSED_SYMBOL(simple_prepare_write);
 EXPORT_SYMBOL(simple_readpage);
 EXPORT_SYMBOL(simple_release_fs);
 EXPORT_SYMBOL(simple_rename);