vfat/msdos timestamps are stored on-disk with several different granularities, some of them lower resolution than timespec_trunc() can provide. In addition, they are only truncated as they are written to disk, so the timestamps in-memory for new or modified files/directories may be different from the same timestamps after a remount, as the now-truncated times are re-read from the on-disk format. These patches allow finer granularity for the timestamps where possible and add fat-specific ->update_time inode operation and fat_truncate_time functions to truncate each timestamp correctly, giving consistent times across remounts. Frank Sorenson (4): fat: set the s_time_gran for msdos or vfat mounts fat: create function to calculate timezone offset fat: add functions to update and truncate the timestamps appropriately fat: change timestamp updates to fat_update_time or fat_truncate_time fs/fat/dir.c | 2 +- fs/fat/fat.h | 14 ++++++++++ fs/fat/file.c | 18 ++++++++++--- fs/fat/inode.c | 6 ++--- fs/fat/misc.c | 74 +++++++++++++++++++++++++++++++++++++++++++++------- fs/fat/namei_msdos.c | 17 ++++++------ fs/fat/namei_vfat.c | 15 ++++++----- 7 files changed, 114 insertions(+), 32 deletions(-) -- 2.13.6
