From: Bob Peterson <rpete...@redhat.com>
In testing fsck.gfs2 I noticed some incorrect behavior: If a block
was referenced incorrectly by two dinodes, fsck deleted which
ever reference it found first. Therefore, if a system dinode
and a user dinode referenced the same block, fsck.gfs2 could
mistakenly delete the system dinode. For example, a journal could
get deleted because a user dinode improperly referenced one of its
blocks. This patch gives priority to system dinodes when resolving
duplicates.
rhbz#675723
---
gfs2/fsck/pass1b.c | 9 ++++++++-
gfs2/fsck/util.c | 14 ++++++++++++--
2 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/gfs2/fsck/pass1b.c b/gfs2/fsck/pass1b.c
index b7be683..da71f99 100644
--- a/gfs2/fsck/pass1b.c
+++ b/gfs2/fsck/pass1b.c
@@ -483,7 +483,14 @@ static int resolve_dup_references(struct gfs2_sbd *sdp,
struct duptree *b,
continue; /* don't delete the dinode */
}
}
-
+ /* If this reference is from a system inode, for example, if
+ it's data or metadata inside a journal, the reference
+ should take priority over user dinodes that reference the
+ block. */
+ if (!found_good_ref && fsck_system_inode(sdp, id->block_no)) {
+ found_good_ref = 1;
+ continue; /* don't delete the dinode */
+ }
log_warn( _("Inode %s (%lld/0x%llx) references block "
"%llu (0x%llx) as '%s', but the block is "
"really %s.\n"),
diff --git a/gfs2/fsck/util.c b/gfs2/fsck/util.c
index 69bf328..0be86de 100644
--- a/gfs2/fsck/util.c
+++ b/gfs2/fsck/util.c
@@ -280,8 +280,18 @@ int add_duplicate_ref(struct gfs2_inode *ip, uint64_t
block,
inode reference list otherwise put it on the normal list. */
if (!inode_valid || q == gfs2_inode_invalid)
osi_list_add_prev(&id->list, &dt->ref_invinode_list);
- else
- osi_list_add_prev(&id->list, &dt->ref_inode_list);
+ else {
+ /* If this is a system dinode, we want the duplicate
+ processing to find it first. That way references
+ from inside journals, et al, will take priority.
+ We don't want to delete journals in favor of dinodes
+ that reference a block inside a journal. */
+ if (fsck_system_inode(ip->i_sbd, id->block_no))
+ osi_list_add(&id->list, &dt->ref_inode_list);
+ else
+ osi_list_add_prev(&id->list,
+ &dt->ref_inode_list);
+ }
}
id->reftypecount[reftype]++;
id->dup_count++;
--
1.7.7.5
