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fs/ext4: use rbtree postorder iteration helper instead of opencoding
Use rbtree_postorder_for_each_entry_safe() to destroy the rbtree instead of opencoding an alternate postorder iteration that modifies the tree Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Michel Lespinasse <walken@google.com> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -180,37 +180,12 @@ int ext4_setup_system_zone(struct super_block *sb)
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/* Called when the filesystem is unmounted */
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void ext4_release_system_zone(struct super_block *sb)
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{
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struct rb_node *n = EXT4_SB(sb)->system_blks.rb_node;
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struct rb_node *parent;
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struct ext4_system_zone *entry;
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struct ext4_system_zone *entry, *n;
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while (n) {
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/* Do the node's children first */
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if (n->rb_left) {
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n = n->rb_left;
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continue;
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}
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if (n->rb_right) {
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n = n->rb_right;
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continue;
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}
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/*
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* The node has no children; free it, and then zero
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* out parent's link to it. Finally go to the
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* beginning of the loop and try to free the parent
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* node.
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*/
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parent = rb_parent(n);
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entry = rb_entry(n, struct ext4_system_zone, node);
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rbtree_postorder_for_each_entry_safe(entry, n,
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&EXT4_SB(sb)->system_blks, node)
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kmem_cache_free(ext4_system_zone_cachep, entry);
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if (!parent)
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EXT4_SB(sb)->system_blks = RB_ROOT;
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else if (parent->rb_left == n)
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parent->rb_left = NULL;
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else if (parent->rb_right == n)
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parent->rb_right = NULL;
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n = parent;
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}
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EXT4_SB(sb)->system_blks = RB_ROOT;
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}
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@ -353,41 +353,16 @@ struct fname {
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*/
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static void free_rb_tree_fname(struct rb_root *root)
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{
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struct rb_node *n = root->rb_node;
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struct rb_node *parent;
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struct fname *fname;
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struct fname *fname, *next;
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while (n) {
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/* Do the node's children first */
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if (n->rb_left) {
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n = n->rb_left;
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continue;
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}
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if (n->rb_right) {
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n = n->rb_right;
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continue;
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}
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/*
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* The node has no children; free it, and then zero
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* out parent's link to it. Finally go to the
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* beginning of the loop and try to free the parent
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* node.
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*/
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parent = rb_parent(n);
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fname = rb_entry(n, struct fname, rb_hash);
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rbtree_postorder_for_each_entry_safe(fname, next, root, rb_hash)
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while (fname) {
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struct fname *old = fname;
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fname = fname->next;
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kfree(old);
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}
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if (!parent)
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*root = RB_ROOT;
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else if (parent->rb_left == n)
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parent->rb_left = NULL;
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else if (parent->rb_right == n)
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parent->rb_right = NULL;
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n = parent;
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}
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*root = RB_ROOT;
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}
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