On Wed, 2007-02-21 at 18:51 +0100, Miklos Szeredi wrote: > From: Miklos Szeredi <mszeredi@xxxxxxx> > > This patch makes writing to shared memory mappings update st_ctime and > st_mtime as defined by SUSv3: > > The st_ctime and st_mtime fields of a file that is mapped with > MAP_SHARED and PROT_WRITE shall be marked for update at some point > in the interval between a write reference to the mapped region and > the next call to msync() with MS_ASYNC or MS_SYNC for that portion > of the file by any process. If there is no such call and if the > underlying file is modified as a result of a write reference, then > these fields shall be marked for update at some time after the > write reference. > > A new address_space flag is introduced: AS_CMTIME. This is set each > time a page is dirtied through a userspace memory mapping. This > includes write accesses via get_user_pages(). > > Note, the flag is set unconditionally, even if the page is already > dirty. This is important, because the page might have been dirtied > earlier by a non-mmap write. > > This flag is checked in msync() and __fput(), and if set, the file > times are updated and the flag is cleared Why not also check inside vfs_getattr? Cheers Trond - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
