ceph: fix ceph_lookup_open intent usage
We weren't properly calling lookup_instantiate_filp when setting up the
lookup intent, which could lead to file leakage on errors. So:
- use separate helper for the hidden snapdir translation, immediately
following the mds request
- use ceph_finish_lookup for the final dentry/return value dance in the
exit path
- lookup_instantiate_filp on success
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index e0115eb..f34d47d 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -223,8 +223,9 @@
{
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
- struct file *file = nd->intent.open.file;
+ struct file *file;
struct ceph_mds_request *req;
+ struct dentry *ret;
int err;
int flags = nd->intent.open.flags - 1; /* silly vfs! */
@@ -245,15 +246,21 @@
err = ceph_mdsc_do_request(mdsc,
(flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
req);
- dentry = ceph_finish_lookup(req, dentry, err);
- if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
+ err = ceph_handle_snapdir(req, dentry, err);
+ if (err)
+ goto out;
+ if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
err = ceph_handle_notrace_create(dir, dentry);
- if (!err)
- err = ceph_init_file(req->r_dentry->d_inode, file,
- req->r_fmode);
+ if (err)
+ goto out;
+ file = lookup_instantiate_filp(nd, req->r_dentry, ceph_open);
+ if (IS_ERR(file))
+ err = PTR_ERR(file);
+out:
+ ret = ceph_finish_lookup(req, dentry, err);
ceph_mdsc_put_request(req);
- dout("ceph_lookup_open result=%p\n", dentry);
- return dentry;
+ dout("ceph_lookup_open result=%p\n", ret);
+ return ret;
}
int ceph_release(struct inode *inode, struct file *file)