From: Arnd Bergmann Date: Fri, 2 Nov 2018 22:48:23 +0000 (-0700) Subject: ocfs2: dlmglue: clean up timestamp handling X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=3a3d1e51042895c58d4797831921c940b28d8c4b;p=openwrt%2Fstaging%2Fblogic.git ocfs2: dlmglue: clean up timestamp handling The handling of timestamps outside of the 1970..2038 range in the dlm glue is rather inconsistent: on 32-bit architectures, this has always wrapped around to negative timestamps in the 1902..1969 range, while on 64-bit kernels all timestamps are interpreted as positive 34 bit numbers in the 1970..2514 year range. Now that the VFS code handles 64-bit timestamps on all architectures, we can make the behavior more consistent here, and return the same result that we had on 64-bit already, making the file system y2038 safe in the process. Outside of dlmglue, it already uses 64-bit on-disk timestamps anway, so that part is fine. For consistency, I'm changing ocfs2_pack_timespec() to clamp anything outside of the supported range to the minimum and maximum values. This avoids a possible ambiguity of values before 1970 in particular, which used to be interpreted as times at the end of the 2514 range previously. Link: http://lkml.kernel.org/r/20180619155826.4106487-1-arnd@arndb.de Signed-off-by: Arnd Bergmann Reviewed-by: Andrew Morton Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Cc: Joseph Qi Cc: Changwei Ge Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 178cb9e6772a..7c835824247e 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -2123,10 +2123,10 @@ static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, /* LVB only has room for 64 bits of time here so we pack it for * now. */ -static u64 ocfs2_pack_timespec(struct timespec *spec) +static u64 ocfs2_pack_timespec(struct timespec64 *spec) { u64 res; - u64 sec = spec->tv_sec; + u64 sec = clamp_t(time64_t, spec->tv_sec, 0, 0x3ffffffffull); u32 nsec = spec->tv_nsec; res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); @@ -2142,7 +2142,6 @@ static void __ocfs2_stuff_meta_lvb(struct inode *inode) struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; struct ocfs2_meta_lvb *lvb; - struct timespec ts; lvb = ocfs2_dlm_lvb(&lockres->l_lksb); @@ -2163,15 +2162,12 @@ static void __ocfs2_stuff_meta_lvb(struct inode *inode) lvb->lvb_igid = cpu_to_be32(i_gid_read(inode)); lvb->lvb_imode = cpu_to_be16(inode->i_mode); lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); - ts = timespec64_to_timespec(inode->i_atime); lvb->lvb_iatime_packed = - cpu_to_be64(ocfs2_pack_timespec(&ts)); - ts = timespec64_to_timespec(inode->i_ctime); + cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); lvb->lvb_ictime_packed = - cpu_to_be64(ocfs2_pack_timespec(&ts)); - ts = timespec64_to_timespec(inode->i_mtime); + cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); lvb->lvb_imtime_packed = - cpu_to_be64(ocfs2_pack_timespec(&ts)); + cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); @@ -2180,7 +2176,7 @@ out: mlog_meta_lvb(0, lockres); } -static void ocfs2_unpack_timespec(struct timespec *spec, +static void ocfs2_unpack_timespec(struct timespec64 *spec, u64 packed_time) { spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; @@ -2189,7 +2185,6 @@ static void ocfs2_unpack_timespec(struct timespec *spec, static void ocfs2_refresh_inode_from_lvb(struct inode *inode) { - struct timespec ts; struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; struct ocfs2_meta_lvb *lvb; @@ -2217,15 +2212,12 @@ static void ocfs2_refresh_inode_from_lvb(struct inode *inode) i_gid_write(inode, be32_to_cpu(lvb->lvb_igid)); inode->i_mode = be16_to_cpu(lvb->lvb_imode); set_nlink(inode, be16_to_cpu(lvb->lvb_inlink)); - ocfs2_unpack_timespec(&ts, + ocfs2_unpack_timespec(&inode->i_atime, be64_to_cpu(lvb->lvb_iatime_packed)); - inode->i_atime = timespec_to_timespec64(ts); - ocfs2_unpack_timespec(&ts, + ocfs2_unpack_timespec(&inode->i_mtime, be64_to_cpu(lvb->lvb_imtime_packed)); - inode->i_mtime = timespec_to_timespec64(ts); - ocfs2_unpack_timespec(&ts, + ocfs2_unpack_timespec(&inode->i_ctime, be64_to_cpu(lvb->lvb_ictime_packed)); - inode->i_ctime = timespec_to_timespec64(ts); spin_unlock(&oi->ip_lock); }