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authorAl Viro <viro@zeniv.linux.org.uk>2016-03-07 23:07:10 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2016-03-07 23:07:10 -0500
commitf93812846f31381d35c04c6c577d724254355e7f (patch)
tree4043f57ba651a15b78e190d65da120791c085318
parent803c00123a8012b3a283c0530910653973ef6d8f (diff)
jffs2: reduce the breakage on recovery from halfway failed rename()
d_instantiate(new_dentry, old_inode) is absolutely wrong thing to do - it will oops if new_dentry used to be positive, for starters. What we need is d_invalidate() the target and be done with that. Cc: stable@vger.kernel.org # v3.18+ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/jffs2/dir.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index d211b8e18566..30c4c9ebb693 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -843,9 +843,14 @@ static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
__func__, ret);
- /* Might as well let the VFS know */
- d_instantiate(new_dentry, d_inode(old_dentry));
- ihold(d_inode(old_dentry));
+ /*
+ * We can't keep the target in dcache after that.
+ * For one thing, we can't afford dentry aliases for directories.
+ * For another, if there was a victim, we _can't_ set new inode
+ * for that sucker and we have to trigger mount eviction - the
+ * caller won't do it on its own since we are returning an error.
+ */
+ d_invalidate(new_dentry);
new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
return ret;
}