[XFS] Don't grow filesystems past the size they can index.

When growing a filesystem we don't check to see if the new size overflows
the page cache index range, so we can do silly things like grow a
filesystem page 16TB on a 32bit. Check new filesystem sizes against the
limits the kernel can support.

SGI-PV: 957886
SGI-Modid: xfs-linux-melb:xfs-kern:28563a

Signed-Off-By: Nathan Scott <nscott@aconex.com>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index b599e6be9ec1..25e5eae8a976 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -140,6 +140,8 @@ xfs_growfs_data_private(
         pct = in->imaxpct;
         if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
                 return XFS_ERROR(EINVAL);
+        if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
+                return error;
         dpct = pct - mp->m_sb.sb_imax_pct;
         error = xfs_read_buf(mp, mp->m_ddev_targp,
                         XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),