introduce __block_write_begin

Split up the block_write_begin implementation - __block_write_begin is a new
trivial wrapper for block_prepare_write that always takes an already
allocated page and can be either called from block_write_begin or filesystem
code that already has a page allocated.  Remove the handling of already
allocated pages from block_write_begin after switching all callers that
do it to __block_write_begin.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 2 deletions

diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index a66f3fe33672..5c6f07eefa4a 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1196,8 +1196,7 @@ retry:
                 ret = PTR_ERR(handle);
                 goto out;
         }
-        ret = block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
-                                                        ext3_get_block);
+        ret = __block_write_begin(page, pos, len, ext3_get_block);
         if (ret)
                 goto write_begin_failed;