Hello, to provide reliable support for filesystem freezing, filesystems need to have complete control over when metadata is changed. In particular, file_update_time() calls from page fault code make it impossible for filesystems to prevent inodes from being dirtied while the filesystem is frozen. To fix the issue, this patch set changes page fault code to call file_update_time() only when ->page_mkwrite() callback is not provided. If the callback is provided, it is the responsibility of the filesystem to perform update of i_mtime / i_ctime if needed. We also push file_update_time() call to all existing ->page_mkwrite() implementations if the time update does not obviously happen by other means. This is including __block_page_mkwrite() so filesystems using it are handled. If you know your filesystem does not need update of modification times in ->page_mkwrite() handler, please speak up and I'll drop the patch for your filesystem. As a side note, an alternative would be to remove calls of file_update_time() from page fault code altogether and require all filesystems needing it to do that in their ->page_mkwrite() implementation. That is certainly possible although maybe slightly inefficient and would require auditting 100+ vm_operations_structs *shiver*. Changes since v1: * Dropped patches for filesystems which don't need them * Added some acks * Improved sysfs patch by Alex Elder's suggestion Changes since v2: * Dropped patches for more filesystems Andrew, would you be willing to merge these patches via your tree? This seems to be a final version. Honza CC: Jaya Kumar <jayalk@xxxxxxxxxxxx> CC: Sage Weil <sage@xxxxxxxxxxxx> CC: ceph-devel@xxxxxxxxxxxxxxx CC: Eric Van Hensbergen <ericvh@xxxxxxxxx> CC: Ron Minnich <rminnich@xxxxxxxxxx> CC: Latchesar Ionkov <lucho@xxxxxxxxxx> CC: v9fs-developer@xxxxxxxxxxxxxxxxxxxxx CC: Steven Whitehouse <swhiteho@xxxxxxxxxx> CC: cluster-devel@xxxxxxxxxx CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>