From: Dave Chinner Date: Thu, 27 Jun 2013 06:04:59 +0000 (+1000) Subject: xfs: implement inode change count X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=dc037ad7d24f3711e431a45c053b5d425995e9e4;p=linux.git xfs: implement inode change count For CRC enabled filesystems, add support for the monotonic inode version change counter that is needed by protocols like NFSv4 for determining if the inode has changed in any way at all between two unrelated operations on the inode. This bumps the change count the first time an inode is dirtied in a transaction. Since all modifications to the inode are logged, this will catch all changes that are made to the inode, including timestamp updates that occur during data writes. Signed-off-by: Dave Chinner Reviewed-by: Mark Tinguely Reviewed-by: Chandra Seetharaman Signed-off-by: Ben Myers --- diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 30ef68f8a390d..e5e8b5ee8bfa0 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1477,6 +1477,10 @@ xfs_fs_fill_super( sb->s_time_gran = 1; set_posix_acl_flag(sb); + /* version 5 superblocks support inode version counters. */ + if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5) + sb->s_flags |= MS_I_VERSION; + error = xfs_mountfs(mp); if (error) goto out_filestream_unmount; diff --git a/fs/xfs/xfs_trans_inode.c b/fs/xfs/xfs_trans_inode.c index ac6d567704dbe..53dfe46f36807 100644 --- a/fs/xfs/xfs_trans_inode.c +++ b/fs/xfs/xfs_trans_inode.c @@ -112,6 +112,17 @@ xfs_trans_log_inode( ASSERT(ip->i_itemp != NULL); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); + /* + * First time we log the inode in a transaction, bump the inode change + * counter if it is configured for this to occur. + */ + if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) && + IS_I_VERSION(VFS_I(ip))) { + inode_inc_iversion(VFS_I(ip)); + ip->i_d.di_changecount = VFS_I(ip)->i_version; + flags |= XFS_ILOG_CORE; + } + tp->t_flags |= XFS_TRANS_DIRTY; ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;