xfs: reset rootdir extent size hint after growfsrt

[ Upstream commit a24cae8fc1f13f6f6929351309f248fd2e9351ce ]

If growfsrt is run on a filesystem that doesn't have a rt volume, it's
possible to change the rt extent size.  If the root directory was
previously set up with an inherited extent size hint and rtinherit, it's
possible that the hint is no longer a multiple of the rt extent size.
Although the verifiers don't complain about this, xfs_repair will, so if
we detect this situation, log the root directory to clean it up.  This
is still racy, but it's better than nothing.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com>
Acked-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 149fcfc485d8920d3e596f44255a3116f851d307..fc21b4e81ade855026ecad37f5c6c11f13f79e69 100644 (file)
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -915,6 +915,39 @@ xfs_alloc_rsum_cache(
                xfs_warn(mp, "could not allocate realtime summary cache");
 }
 
+/*
+ * If we changed the rt extent size (meaning there was no rt volume previously)
+ * and the root directory had EXTSZINHERIT and RTINHERIT set, it's possible
+ * that the extent size hint on the root directory is no longer congruent with
+ * the new rt extent size.  Log the rootdir inode to fix this.
+ */
+static int
+xfs_growfs_rt_fixup_extsize(
+       struct xfs_mount        *mp)
+{
+       struct xfs_inode        *ip = mp->m_rootip;
+       struct xfs_trans        *tp;
+       int                     error = 0;
+
+       xfs_ilock(ip, XFS_IOLOCK_EXCL);
+       if (!(ip->i_diflags & XFS_DIFLAG_RTINHERIT) ||
+           !(ip->i_diflags & XFS_DIFLAG_EXTSZINHERIT))
+               goto out_iolock;
+
+       error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_ichange, 0, 0, false,
+                       &tp);
+       if (error)
+               goto out_iolock;
+
+       xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+       error = xfs_trans_commit(tp);
+       xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+out_iolock:
+       xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+       return error;
+}
+
 /*
  * Visible (exported) functions.
  */
@@ -944,6 +977,7 @@ xfs_growfs_rt(
        xfs_sb_t        *sbp;           /* old superblock */
        xfs_fsblock_t   sumbno;         /* summary block number */
        uint8_t         *rsum_cache;    /* old summary cache */
+       xfs_agblock_t   old_rextsize = mp->m_sb.sb_rextsize;
 
        sbp = &mp->m_sb;
 
@@ -1177,6 +1211,12 @@ error_cancel:
        if (error)
                goto out_free;
 
+       if (old_rextsize != in->extsize) {
+               error = xfs_growfs_rt_fixup_extsize(mp);
+               if (error)
+                       goto out_free;
+       }
+
        /* Update secondary superblocks now the physical grow has completed */
        error = xfs_update_secondary_sbs(mp);