cifs: add refcounted and timestamped container for holding tcons
Eventually, we'll need to track the use of tcons on a per-sb basis, so that
we know when it's ok to tear them down. Begin this conversion by adding a
new "tcon_link" struct and accessors that get it. For now, the core data
structures are untouched -- cifs_sb still just points to a single tcon and
the pointers are just cast to deal with the accessor functions. A later
patch will flesh this out.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index f1e13ea..f4aab6f 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -306,6 +306,7 @@
int xid, i;
int rc = 0;
struct vfsmount *mnt = ERR_PTR(-ENOENT);
+ struct tcon_link *tlink;
cFYI(1, "in %s", __func__);
BUG_ON(IS_ROOT(dentry));
@@ -315,14 +316,6 @@
dput(nd->path.dentry);
nd->path.dentry = dget(dentry);
- cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
- ses = cifs_sb_tcon(cifs_sb)->ses;
-
- if (!ses) {
- rc = -EINVAL;
- goto out_err;
- }
-
/*
* The MSDFS spec states that paths in DFS referral requests and
* responses must be prefixed by a single '\' character instead of
@@ -335,10 +328,20 @@
goto out_err;
}
- rc = get_dfs_path(xid, ses , full_path + 1, cifs_sb->local_nls,
+ cifs_sb = CIFS_SB(dentry->d_inode->i_sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ rc = PTR_ERR(tlink);
+ goto out_err;
+ }
+ ses = tlink_tcon(tlink)->ses;
+
+ rc = get_dfs_path(xid, ses, full_path + 1, cifs_sb->local_nls,
&num_referrals, &referrals,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+ cifs_put_tlink(tlink);
+
for (i = 0; i < num_referrals; i++) {
int len;
dump_referral(referrals+i);