Mikulas Patocka da0d5ccf84 ext2: don't update mtime on COW faults ... commit 1ef6ea0efe8e68d0299dad44c39dc6ad9e5d1f39 upstream. When running in a dax mode, if the user maps a page with MAP_PRIVATE and PROT_WRITE, the ext2 filesystem would incorrectly update ctime and mtime when the user hits a COW fault. This breaks building of the Linux kernel. How to reproduce: 1. extract the Linux kernel tree on dax-mounted ext2 filesystem 2. run make clean 3. run make -j12 4. run make -j12 at step 4, make would incorrectly rebuild the whole kernel (although it was already built in step 3). The reason for the breakage is that almost all object files depend on objtool. When we run objtool, it takes COW page fault on its .data section, and these faults will incorrectly update the timestamp of the objtool binary. The updated timestamp causes make to rebuild the whole tree. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-09-09 19:04:28 +02:00
..
acl.c
acl.h
balloc.c
dir.c
ext2.h
file.c	ext2: don't update mtime on COW faults	2020-09-09 19:04:28 +02:00
ialloc.c	ext2: fix missing percpu_counter_inc	2020-08-21 11:05:32 +02:00
inode.c
ioctl.c
Kconfig
Makefile
namei.c
super.c
symlink.c
xattr.c	ext2: fix debug reference to ext2_xattr_cache	2020-04-23 10:30:21 +02:00
xattr.h
xattr_security.c
xattr_trusted.c
xattr_user.c