From: Mingming Date: Tue, 10 Nov 2009 15:48:08 +0000 (-0500) Subject: ext4: fix ext4_ext_direct_IO()'s return value after converting uninit extents X-Git-Tag: v2.6.32-rc7~49^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=109f55651954def97fa41ee71c464d268c512ab0;p=pandora-kernel.git ext4: fix ext4_ext_direct_IO()'s return value after converting uninit extents After a direct I/O request covering an uninitalized extent (i.e., created using the fallocate system call) or a hole in a file, ext4 will convert the uninitialized extent so it is marked as initialized by calling ext4_convert_unwritten_extents(). This function returns zero on success. This return value was getting returned by ext4_direct_IO(); however the file system's direct_IO function is supposed to return the number of bytes read or written on a success. By returning zero, it confused the direct I/O code into falling back to buffered I/O unnecessarily. Signed-off-by: Mingming Cao Signed-off-by: "Theodore Ts'o" --- Reading git-diff-tree failed