GFS2: Fix one RG corner case

For filesystems with only a single resource group, we need to be careful
that the allocation loop will not land up with a NULL resource group. This
fixes a bug in a previous patch where the gfs2_rgrpd_get_next() function
was being used instead of gfs2_rgrpd_get_first()

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

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 99a619788c6541d4562894311a52743d7ed280a6..5625e93bf61fb4cf2e561a92741fe6e511f9c587 100644 (file)
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1776,10 +1776,11 @@ static u32 gfs2_orlov_skip(const struct gfs2_inode *ip)
 static bool gfs2_select_rgrp(struct gfs2_rgrpd **pos, const struct gfs2_rgrpd *begin)
 {
        struct gfs2_rgrpd *rgd = *pos;
+       struct gfs2_sbd *sdp = rgd->rd_sbd;
 
        rgd = gfs2_rgrpd_get_next(rgd);
        if (rgd == NULL)
-               rgd = gfs2_rgrpd_get_next(NULL);
+               rgd = gfs2_rgrpd_get_first(sdp);
        *pos = rgd;
        if (rgd != begin) /* If we didn't wrap */
                return true;