Hello, this is a second version of the patches to fix data corruption in mmapped data when blocksize < pagesize as tested by xfstests generic/030 test. The patchset fixes XFS and ext4. I've checked and btrfs doesn't need fixing because it doesn't support blocksize < pagesize. If that's ever going to change btrfs will likely need a similar treatment. ocfs2, ext2, ext3 are OK since they happily allocate blocks during writeback. For other filesystems like gfs2, ubifs, nilfs, ceph,... I'm not sure whether they support blocksize < pagesize at all. Interesting is also NFS which may care but I don't understand its ->page_mkwrite() handler good enough to judge. Changes since v1: - changed helper function name and moved it to mm/truncate.c - I originally thought we can make the helper function update i_size to simplify the interface but it's actually impossible due to generic_write_end() lock ordering constraints. - used round_up() instead of ALIGN() - taught truncate_setsize() to use the helper function Honza -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
