ocfs2: teach ocfs2_file_aio_write() about sparse files

[powerpc.git] / fs / splice.c

diff --git a/fs/splice.c b/fs/splice.c
index badc78f..5428b0f 100644 (file)
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -593,36 +593,6 @@ find_page:
                        goto out;
        }
 
-       /*
-        * We get here with the page locked. If the page is also
-        * uptodate, we don't need to do more. If it isn't, we
-        * may need to bring it in if we are not going to overwrite
-        * the full page.
-        */
-       if (!PageUptodate(page)) {
-               if (this_len < PAGE_CACHE_SIZE) {
-                       ret = mapping->a_ops->readpage(file, page);
-                       if (unlikely(ret))
-                               goto out;
-
-                       lock_page(page);
-
-                       if (!PageUptodate(page)) {
-                               /*
-                                * Page got invalidated, repeat.
-                                */
-                               if (!page->mapping) {
-                                       unlock_page(page);
-                                       page_cache_release(page);
-                                       goto find_page;
-                               }
-                               ret = -EIO;
-                               goto out;
-                       }
-               } else
-                       SetPageUptodate(page);
-       }
-
        ret = mapping->a_ops->prepare_write(file, page, offset, offset+this_len);
        if (unlikely(ret)) {
                loff_t isize = i_size_read(mapping->host);
@@ -657,18 +627,25 @@ find_page:
        }
 
        ret = mapping->a_ops->commit_write(file, page, offset, offset+this_len);
-       if (!ret) {
+       if (ret) {
+               if (ret == AOP_TRUNCATED_PAGE) {
+                       page_cache_release(page);
+                       goto find_page;
+               }
+               if (ret < 0)
+                       goto out;
                /*
-                * Return the number of bytes written and mark page as
-                * accessed, we are now done!
+                * Partial write has happened, so 'ret' already initialized by
+                * number of bytes written, Where is nothing we have to do here.
                 */
+       } else
                ret = this_len;
-               mark_page_accessed(page);
-               balance_dirty_pages_ratelimited(mapping);
-       } else if (ret == AOP_TRUNCATED_PAGE) {
-               page_cache_release(page);
-               goto find_page;
-       }
+       /*
+        * Return the number of bytes written and mark page as
+        * accessed, we are now done!
+        */
+       mark_page_accessed(page);
+       balance_dirty_pages_ratelimited(mapping);
 out:
        page_cache_release(page);
        unlock_page(page);
@@ -681,9 +658,9 @@ out_ret:
  * key here is the 'actor' worker passed in that actually moves the data
  * to the wanted destination. See pipe_to_file/pipe_to_sendpage above.
  */
-static ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
-                                 struct file *out, loff_t *ppos, size_t len,
-                                 unsigned int flags, splice_actor *actor)
+ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
+                          struct file *out, loff_t *ppos, size_t len,
+                          unsigned int flags, splice_actor *actor)
 {
        int ret, do_wakeup, err;
        struct splice_desc sd;
@@ -777,6 +754,7 @@ static ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
 
        return ret;
 }
+EXPORT_SYMBOL(__splice_from_pipe);
 
 ssize_t splice_from_pipe(struct pipe_inode_info *pipe, struct file *out,
                         loff_t *ppos, size_t len, unsigned int flags,