[JFFS2] Simplify and clean up jffs2_add_tn_to_tree() some more.
Fixing at least a couple more bugs in the process.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index bd31d49..4884d5e 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -240,21 +240,17 @@
/* Find the earliest node which _may_ be relevant to this one */
this = jffs2_lookup_tn(&rii->tn_root, tn->fn->ofs);
- if (!this) {
- /* First addition to empty tree. $DEITY how I love the easy cases */
- rb_link_node(&tn->rb, NULL, &rii->tn_root.rb_node);
- rb_insert_color(&tn->rb, &rii->tn_root);
- dbg_readinode("keep new frag\n");
- return 0;
+ if (this) {
+ /* If the node is coincident with another at a lower address,
+ back up until the other node is found. It may be relevant */
+ while (this->overlapped)
+ this = tn_prev(this);
+
+ /* First node should never be marked overlapped */
+ BUG_ON(!this);
+ dbg_readinode("'this' found %#04x-%#04x (%s)\n", this->fn->ofs, this->fn->ofs + this->fn->size, this->fn ? "data" : "hole");
}
- /* If the node is coincident with another at a lower address,
- back up until the other node is found. It may be relevant */
- while (tn->overlapped)
- tn = tn_prev(tn);
-
- dbg_readinode("'this' found %#04x-%#04x (%s)\n", this->fn->ofs, this->fn->ofs + this->fn->size, this->fn ? "data" : "hole");
-
while (this) {
if (this->fn->ofs > fn_end)
break;
@@ -288,7 +284,7 @@
return 0;
}
/* ... and is good. Kill 'this' and any subsequent nodes which are also overlapped */
- while (this && this->fn->ofs + this->fn->size < fn_end) {
+ while (this && this->fn->ofs + this->fn->size <= fn_end) {
struct jffs2_tmp_dnode_info *next = tn_next(this);
if (this->version < tn->version) {
tn_erase(this, &rii->tn_root);
@@ -300,7 +296,7 @@
this = next;
}
dbg_readinode("Done killing overlapped nodes\n");
- break;
+ continue;
}
if (this->version > tn->version &&
this->fn->ofs <= tn->fn->ofs &&
@@ -326,7 +322,7 @@
{
struct rb_node *parent;
struct rb_node **link = &rii->tn_root.rb_node;
- struct jffs2_tmp_dnode_info *insert_point;
+ struct jffs2_tmp_dnode_info *insert_point = NULL;
while (*link) {
parent = *link;
@@ -343,7 +339,6 @@
rb_insert_color(&tn->rb, &rii->tn_root);
}
- calc_overlaps:
/* If there's anything behind that overlaps us, note it */
this = tn_prev(tn);
if (this) {