From: Frank Sorenson <sorenson@xxxxxxxxxx> Subject: fat: truncate inode timestamp updates in setattr setattr_copy can't truncate timestamps correctly for msdos/vfat, so truncate and copy them ourselves. Link: http://lkml.kernel.org/r/a2b4701b1125573fafaeaae6802050ca86d6f8cc.1538363961.git.sorenson@xxxxxxxxxx Signed-off-by: Frank Sorenson <sorenson@xxxxxxxxxx> Acked-by: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/fat/file.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/fs/fat/file.c~fat-truncate-inode-timestamp-updates-in-setattr +++ a/fs/fat/file.c @@ -542,6 +542,18 @@ int fat_setattr(struct dentry *dentry, s up_write(&MSDOS_I(inode)->truncate_lock); } + /* + * setattr_copy can't truncate these appropriately, so we'll + * copy them ourselves + */ + if (attr->ia_valid & ATTR_ATIME) + fat_truncate_time(inode, &attr->ia_atime, S_ATIME); + if (attr->ia_valid & ATTR_CTIME) + fat_truncate_time(inode, &attr->ia_ctime, S_CTIME); + if (attr->ia_valid & ATTR_MTIME) + fat_truncate_time(inode, &attr->ia_mtime, S_MTIME); + attr->ia_valid &= ~(ATTR_ATIME|ATTR_CTIME|ATTR_MTIME); + setattr_copy(inode, attr); mark_inode_dirty(inode); out: _
