[PATCH 1/1] ubifs: Fix journal replay wrt. xattr nodes

[Ville Baillie]

backport 1cb51a15b576ee325d527726afff40947218fd5e from Linux
---
 fs/ubifs/tnc.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index e8b8f16838..3303711477 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -50,6 +50,11 @@ enum {
        NOT_ON_MEDIA = 3,
 };
 
+static int fallible_read_node(struct ubifs_info *c, const union ubifs_key *key,
+                              struct ubifs_zbranch *zbr, void *node);
+static int try_read_node(const struct ubifs_info *c, void *buf, int type,
+                         int len, int lnum, int offs);
+
 /**
  * insert_old_idx - record an index node obsoleted since the last commit start.
  * @c: UBIFS file-system description object
@@ -402,7 +407,19 @@ static int tnc_read_node_nm(struct ubifs_info *c, struct 
ubifs_zbranch *zbr,
                return 0;
        }
 
-       err = ubifs_tnc_read_node(c, zbr, node);
+       if (c->replaying) {
+               err = fallible_read_node(c, &zbr->key, zbr, node);
+               /*
+                * When the node was not found, return -ENOENT, 0 otherwise.
+                * Negative return codes stay as-is.
+                */
+               if (err == 0)
+                       err = -ENOENT;
+               else if (err == 1)
+                       err = 0;
+       } else {
+               err = ubifs_tnc_read_node(c, zbr, node);
+       }
        if (err)
                return err;
 
@@ -2770,7 +2787,11 @@ struct ubifs_dent_node *ubifs_tnc_next_ent(struct 
ubifs_info *c,
        if (nm->name) {
                if (err) {
                        /* Handle collisions */
-                       err = resolve_collision(c, key, &znode, &n, nm);
+                       if (c->replaying)
+                               err = fallible_resolve_collision(c, key, 
&znode, &n,
+                                                        nm, 0);
+                       else
+                               err = resolve_collision(c, key, &znode, &n, nm);
                        dbg_tnc("rc returned %d, znode %p, n %d",
                                err, znode, n);
                        if (unlikely(err < 0))
-- 
2.17.1