The patch below does not apply to the 3.16-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 6f18493e541c690169c3b1479d47d95f624161cf Mon Sep 17 00:00:00 2001
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Thu, 11 Sep 2014 18:55:50 -0400
Subject: [PATCH] move the call of __d_drop(anon) into
__d_materialise_unique(dentry, anon)
and lock the right list there
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
diff --git a/fs/dcache.c b/fs/dcache.c
index d30ce699ae4b..5c6e71dc23f5 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2656,6 +2656,12 @@ static void __d_materialise_dentry(struct dentry *dentry, struct dentry *anon)
dentry->d_parent = dentry;
list_del_init(&dentry->d_u.d_child);
anon->d_parent = dparent;
+ if (likely(!d_unhashed(anon))) {
+ hlist_bl_lock(&anon->d_sb->s_anon);
+ __hlist_bl_del(&anon->d_hash);
+ anon->d_hash.pprev = NULL;
+ hlist_bl_unlock(&anon->d_sb->s_anon);
+ }
list_move(&anon->d_u.d_child, &dparent->d_subdirs);
write_seqcount_end(&dentry->d_seq);
@@ -2714,7 +2720,6 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
write_seqlock(&rename_lock);
__d_materialise_dentry(dentry, new);
write_sequnlock(&rename_lock);
- __d_drop(new);
_d_rehash(new);
spin_unlock(&new->d_lock);
spin_unlock(&inode->i_lock);
@@ -2778,7 +2783,6 @@ struct dentry *d_materialise_unique(struct dentry *dentry, struct inode *inode)
* could splice into our tree? */
__d_materialise_dentry(dentry, alias);
write_sequnlock(&rename_lock);
- __d_drop(alias);
goto found;
} else {
/* Nope, but we must(!) avoid directory
--
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