GFS2: Improve resource group error handling

This patch improves the error handling in the case where we
discover that the summary information in the resource group
doesn't match the bitmap information while in the process of
allocating blocks. Originally this resulted in a kernel bug,
but this patch changes that so that we return -EIO and print
some messages explaining what went wrong, and how to fix it.

We also remember locally not to try and allocate from the
same rgrp again, so that a subsequent allocation in a
different rgrp should succeed.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index aef4d0c06748..297d7e5cebad 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -803,13 +803,20 @@ static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh,
 {
         struct gfs2_inode *ip = GFS2_I(inode);
         unsigned int n = 1;
-        u64 bn = gfs2_alloc_block(ip, &n);
-        struct buffer_head *bh = gfs2_meta_new(ip->i_gl, bn);
+        u64 bn;
+        int error;
+        struct buffer_head *bh;
         struct gfs2_leaf *leaf;
         struct gfs2_dirent *dent;
         struct qstr name = { .name = "", .len = 0, .hash = 0 };
+
+        error = gfs2_alloc_block(ip, &bn, &n);
+        if (error)
+                return NULL;
+        bh = gfs2_meta_new(ip->i_gl, bn);
         if (!bh)
                 return NULL;
+
         gfs2_trans_add_unrevoke(GFS2_SB(inode), bn, 1);
         gfs2_trans_add_bh(ip->i_gl, bh, 1);
         gfs2_metatype_set(bh, GFS2_METATYPE_LF, GFS2_FORMAT_LF);