| Message ID | 20230713-mgctime-v5-6-9eb795d2ae37@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | fs: implement multigrain timestamps | expand |
On Thu, Jul 13, 2023 at 07:00:55PM -0400, Jeff Layton wrote: > Enable multigrain timestamps, which should ensure that there is an > apparent change to the timestamp whenever it has been written after > being actively observed via getattr. > > Also, anytime the mtime changes, the ctime must also change, and those > are now the only two options for xfs_trans_ichgtime. Have that function > unconditionally bump the ctime, and warn if XFS_ICHGTIME_CHG is ever not > set. > > Signed-off-by: Jeff Layton <jlayton@kernel.org> > --- > fs/xfs/libxfs/xfs_trans_inode.c | 6 +++--- > fs/xfs/xfs_iops.c | 4 ++-- > fs/xfs/xfs_super.c | 2 +- > 3 files changed, 6 insertions(+), 6 deletions(-) > > diff --git a/fs/xfs/libxfs/xfs_trans_inode.c b/fs/xfs/libxfs/xfs_trans_inode.c > index 0c9df8df6d4a..86f5ffce2d89 100644 > --- a/fs/xfs/libxfs/xfs_trans_inode.c > +++ b/fs/xfs/libxfs/xfs_trans_inode.c > @@ -62,12 +62,12 @@ xfs_trans_ichgtime( > ASSERT(tp); > ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); > > - tv = current_time(inode); > + /* If the mtime changes, then ctime must also change */ > + WARN_ON_ONCE(!(flags & XFS_ICHGTIME_CHG)); Make that an ASSERT(flags & XFS_ICHGTIME_CHG), please. There's no need to verify this at runtime on production kernels. -Dave.
diff --git a/fs/xfs/libxfs/xfs_trans_inode.c b/fs/xfs/libxfs/xfs_trans_inode.c index 0c9df8df6d4a..86f5ffce2d89 100644 --- a/fs/xfs/libxfs/xfs_trans_inode.c +++ b/fs/xfs/libxfs/xfs_trans_inode.c @@ -62,12 +62,12 @@ xfs_trans_ichgtime( ASSERT(tp); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); - tv = current_time(inode); + /* If the mtime changes, then ctime must also change */ + WARN_ON_ONCE(!(flags & XFS_ICHGTIME_CHG)); + tv = inode_set_ctime_current(inode); if (flags & XFS_ICHGTIME_MOD) inode->i_mtime = tv; - if (flags & XFS_ICHGTIME_CHG) - inode_set_ctime_to_ts(inode, tv); } /* diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 3a9363953ef2..3f89ef5a2820 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -573,10 +573,10 @@ xfs_vn_getattr( stat->gid = vfsgid_into_kgid(vfsgid); stat->ino = ip->i_ino; stat->atime = inode->i_atime; - stat->mtime = inode->i_mtime; - stat->ctime = inode_get_ctime(inode); stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks); + fill_mg_cmtime(request_mask, inode, stat); + if (xfs_has_v3inodes(mp)) { if (request_mask & STATX_BTIME) { stat->result_mask |= STATX_BTIME; diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 818510243130..4b10edb2c972 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -2009,7 +2009,7 @@ static struct file_system_type xfs_fs_type = { .init_fs_context = xfs_init_fs_context, .parameters = xfs_fs_parameters, .kill_sb = kill_block_super, - .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, + .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME, }; MODULE_ALIAS_FS("xfs");
Enable multigrain timestamps, which should ensure that there is an apparent change to the timestamp whenever it has been written after being actively observed via getattr. Also, anytime the mtime changes, the ctime must also change, and those are now the only two options for xfs_trans_ichgtime. Have that function unconditionally bump the ctime, and warn if XFS_ICHGTIME_CHG is ever not set. Signed-off-by: Jeff Layton <jlayton@kernel.org> --- fs/xfs/libxfs/xfs_trans_inode.c | 6 +++--- fs/xfs/xfs_iops.c | 4 ++-- fs/xfs/xfs_super.c | 2 +- 3 files changed, 6 insertions(+), 6 deletions(-)