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authorAbhi Das <adas@redhat.com>2015-05-05 19:26:04 +0300
committerBob Peterson <rpeterso@redhat.com>2015-05-05 19:26:04 +0300
commit959b6717175713259664950f3bba2418b038f69a (patch)
treeeb2bc7124b18d8ae3b071b0d8c85a9e0c3a82e94 /fs/gfs2
parent86fbca4923f956dae31247e68dc73ffdfd6e5cb0 (diff)
downloadlinux-959b6717175713259664950f3bba2418b038f69a.tar.xz
gfs2: handle NULL rgd in set_rgrp_preferences
The function set_rgrp_preferences() does not handle the (rarely returned) NULL value from gfs2_rgrpd_get_next() and this patch fixes that. The fs image in question is only 150MB in size which allows for only 1 rgrp to be created. The in-memory rb tree has only 1 node and when gfs2_rgrpd_get_next() is called on this sole rgrp, it returns NULL. (Default behavior is to wrap around the rb tree and return the first node to give the illusion of a circular linked list. In the case of only 1 rgrp, we can't have gfs2_rgrpd_get_next() return the same rgrp (first, last, next all point to the same rgrp)... that would cause unintended consequences and infinite loops.) Signed-off-by: Abhi Das <adas@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/rgrp.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index cb270651c613..900e515bbdf6 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -978,10 +978,10 @@ static void set_rgrp_preferences(struct gfs2_sbd *sdp)
rgd->rd_flags |= GFS2_RDF_PREFERRED;
for (i = 0; i < sdp->sd_journals; i++) {
rgd = gfs2_rgrpd_get_next(rgd);
- if (rgd == first)
+ if (!rgd || rgd == first)
break;
}
- } while (rgd != first);
+ } while (rgd && rgd != first);
}
/**