On Tue, 14 Jul 2015 15:13:00 +0200 Pavel Machek <pavel@xxxxxx> wrote: > Hi! > > > BTW When you "swap" to a file the mtime doesn't get updated. No one seems to > > complain about that. I guess it is a rather narrow use-case though. > > Actually yes, I'd like to complain. > > It was not swap, it was mount -o loop, but I guess that's the same > case. Then rsync refused to work on that file... and being on slow ARM > system it took me a while to figure out WTF is going on. > > So yes, we have problems with mtime, and yes, they matter. > Pavel Odd... I assume you mean mount -o loop /some/file /mountpoint and then when you write to the filesystem on /mountpoint the mtime of /some/file doesn't get updated? I think it should. drivers/block/loop.c uses vfs_iter_write() to write to a file. That calls f_op->write_iter which will typically call generic_file_write_iter() which will call file_update_time() to update the time stamps. What filesystem was /some/file on? I just did some testing on ext4 and it seems to do the right thing mtime gets updated. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
