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authorAl Viro <viro@zeniv.linux.org.uk>2015-05-28 23:09:19 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-05-28 23:45:30 -0400
commit2159184ea01e4ae7d15f2017e296d4bc82d5aeb0 (patch)
treeb278dfe14562b9e312de8050df5a1733cbd622d6 /fs
parent030bbdbf4c833bc69f502eae58498bc5572db736 (diff)
downloadkernel-2159184ea01e4ae7d15f2017e296d4bc82d5aeb0.tar.gz
d_walk() might skip too much
when we find that a child has died while we'd been trying to ascend, we should go into the first live sibling itself, rather than its sibling. Off-by-one in question had been introduced in "deal with deadlock in d_walk()" and the fix needs to be backported to all branches this one has been backported to. Cc: stable@vger.kernel.org # 3.2 and later Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/dcache.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 656ce522a218..37b5afdaf698 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1239,13 +1239,13 @@ ascend:
/* might go back up the wrong parent if we have had a rename. */
if (need_seqretry(&rename_lock, seq))
goto rename_retry;
- next = child->d_child.next;
- while (unlikely(child->d_flags & DCACHE_DENTRY_KILLED)) {
+ /* go into the first sibling still alive */
+ do {
+ next = child->d_child.next;
if (next == &this_parent->d_subdirs)
goto ascend;
child = list_entry(next, struct dentry, d_child);
- next = next->next;
- }
+ } while (unlikely(child->d_flags & DCACHE_DENTRY_KILLED));
rcu_read_unlock();
goto resume;
}