1 files changed, 37 insertions, 14 deletions

diff --git a/fs/smb/client/dfs.h b/fs/smb/client/dfs.h
index 1aa2bc65b3bc..e60f0a24a8a1 100644
--- a/fs/smb/client/dfs.h
+++ b/fs/smb/client/dfs.h
@@ -12,6 +12,7 @@
 #include "dfs_cache.h"
 #include "cifs_unicode.h"
 #include <linux/namei.h>
+#include <linux/errno.h>
 
 #define DFS_INTERLINK(v) \
 	(((v) & DFSREF_REFERRAL_SERVER) && !((v) & DFSREF_STORAGE_SERVER))
@@ -25,8 +26,9 @@ struct dfs_ref {
 };
 
 struct dfs_ref_walk {
-	struct dfs_ref *ref;
-	struct dfs_ref refs[MAX_NESTED_LINKS];
+	struct cifs_mount_ctx	*mnt_ctx;
+	struct dfs_ref		*ref;
+	struct dfs_ref		refs[MAX_NESTED_LINKS];
 };
 
 #define ref_walk_start(w)	((w)->refs)
@@ -35,7 +37,6 @@ struct dfs_ref_walk {
 #define ref_walk_descend(w)	(--ref_walk_cur(w) >= ref_walk_start(w))
 
 #define ref_walk_tit(w)	(ref_walk_cur(w)->tit)
-#define ref_walk_empty(w)	(!ref_walk_tit(w))
 #define ref_walk_path(w)	(ref_walk_cur(w)->path)
 #define ref_walk_fpath(w)	(ref_walk_cur(w)->full_path)
 #define ref_walk_tl(w)		(&ref_walk_cur(w)->tl)
@@ -51,9 +52,11 @@ static inline struct dfs_ref_walk *ref_walk_alloc(void)
 	return rw;
 }
 
-static inline void ref_walk_init(struct dfs_ref_walk *rw)
+static inline void ref_walk_init(struct dfs_ref_walk *rw,
+				 struct cifs_mount_ctx *mnt_ctx)
 {
 	memset(rw, 0, sizeof(*rw));
+	rw->mnt_ctx = mnt_ctx;
 	ref_walk_cur(rw) = ref_walk_start(rw);
 }
 
@@ -93,15 +96,23 @@ static inline int ref_walk_advance(struct dfs_ref_walk *rw)
 static inline struct dfs_cache_tgt_iterator *
 ref_walk_next_tgt(struct dfs_ref_walk *rw)
 {
-	struct dfs_cache_tgt_iterator *tit;
 	struct dfs_ref *ref = ref_walk_cur(rw);
+	struct dfs_cache_tgt_iterator *tit;
+
+	if (IS_ERR(ref->tit))
+		return NULL;
 
 	if (!ref->tit)
 		tit = dfs_cache_get_tgt_iterator(&ref->tl);
 	else
 		tit = dfs_cache_get_next_tgt(&ref->tl, ref->tit);
+
+	if (!tit) {
+		ref->tit = ERR_PTR(-ENOENT);
+		return NULL;
+	}
 	ref->tit = tit;
-	return tit;
+	return ref->tit;
 }
 
 static inline int ref_walk_get_tgt(struct dfs_ref_walk *rw,
@@ -112,11 +123,6 @@ static inline int ref_walk_get_tgt(struct dfs_ref_walk *rw,
 					  ref_walk_tit(rw), tgt);
 }
 
-static inline int ref_walk_num_tgts(struct dfs_ref_walk *rw)
-{
-	return dfs_cache_get_nr_tgts(ref_walk_tl(rw));
-}
-
 static inline void ref_walk_set_tgt_hint(struct dfs_ref_walk *rw)
 {
 	dfs_cache_noreq_update_tgthint(ref_walk_path(rw) + 1,
@@ -136,6 +142,15 @@ static inline void ref_walk_set_tcon(struct dfs_ref_walk *rw,
 	}
 }
 
+static inline void ref_walk_mark_end(struct dfs_ref_walk *rw)
+{
+	struct dfs_ref *ref = ref_walk_cur(rw) - 1;
+
+	WARN_ON_ONCE(ref < ref_walk_start(rw));
+	dfs_cache_noreq_update_tgthint(ref->path + 1, ref->tit);
+	ref->tit = ERR_PTR(-ENOENT); /* end marker */
+}
+
 int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
 			      struct smb3_fs_context *ctx);
 int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx);
@@ -145,15 +160,16 @@ static inline char *dfs_get_path(struct cifs_sb_info *cifs_sb, const char *path)
 	return dfs_cache_canonical_path(path, cifs_sb->local_nls, cifs_remap(cifs_sb));
 }
 
-static inline int dfs_get_referral(struct cifs_mount_ctx *mnt_ctx, const char *path,
-				   struct dfs_info3_param *ref, struct dfs_cache_tgt_list *tl)
+static inline int dfs_get_referral(struct cifs_mount_ctx *mnt_ctx,
+				   const char *path,
+				   struct dfs_cache_tgt_list *tl)
 {
 	struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
 	struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
 	struct cifs_ses *rses = ctx->dfs_root_ses ?: mnt_ctx->ses;
 
 	return dfs_cache_find(mnt_ctx->xid, rses, cifs_sb->local_nls,
-			      cifs_remap(cifs_sb), path, ref, tl);
+			      cifs_remap(cifs_sb), path, NULL, tl);
 }
 
 /*
@@ -172,4 +188,11 @@ static inline void dfs_put_root_smb_sessions(struct list_head *head)
 	}
 }
 
+static inline const char *dfs_ses_refpath(struct cifs_ses *ses)
+{
+	const char *path = ses->server->leaf_fullpath;
+
+	return path ? path + 1 : ERR_PTR(-ENOENT);
+}
+
 #endif /* _CIFS_DFS_H */