On Sat 23-05-20 10:15:20, Martijn Coenen wrote: > Jaegeuk wondered whether callers of write_inode_now() should hold > i_rwsem, and whether that would also prevent this problem. Some > existing callers of write_inode_now() do, eg ntfs and hfs: > > hfs_file_fsync() > inode_lock(inode); > > /* sync the inode to buffers */ > ret = write_inode_now(inode, 0); > > but there are also some that don't (eg fat, fuse, orangefs). Well, most importantly filesystems like ext4, xfs, btrfs don't hold i_rwsem when writing back inode and that's deliberate because of performance. We don't want to block writes (or event reads in case of XFS) for the inode during writeback. Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
