This is a note to let you know that I've just added the patch titled ext4: allow DAX writeback for hole punch to the 4.7-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ext4-allow-dax-writeback-for-hole-punch.patch and it can be found in the queue-4.7 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From cca32b7eeb4ea24fa6596650e06279ad9130af98 Mon Sep 17 00:00:00 2001 From: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> Date: Thu, 22 Sep 2016 11:49:38 -0400 Subject: ext4: allow DAX writeback for hole punch From: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> commit cca32b7eeb4ea24fa6596650e06279ad9130af98 upstream. Currently when doing a DAX hole punch with ext4 we fail to do a writeback. This is because the logic around filemap_write_and_wait_range() in ext4_punch_hole() only looks for dirty page cache pages in the radix tree, not for dirty DAX exceptional entries. Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> Reviewed-by: Jan Kara <jack@xxxxxxx> Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/ext4/inode.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3892,7 +3892,7 @@ int ext4_update_disksize_before_punch(st } /* - * ext4_punch_hole: punches a hole in a file by releaseing the blocks + * ext4_punch_hole: punches a hole in a file by releasing the blocks * associated with the given offset and length * * @inode: File inode @@ -3921,7 +3921,7 @@ int ext4_punch_hole(struct inode *inode, * Write out all dirty pages to avoid race conditions * Then release them. */ - if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) { + if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) { ret = filemap_write_and_wait_range(mapping, offset, offset + length - 1); if (ret) Patches currently in stable-queue which might be from ross.zwisler@xxxxxxxxxxxxxxx are queue-4.7/ext4-allow-dax-writeback-for-hole-punch.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html