diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/ldlm/interval_tree.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/ldlm/interval_tree.c | 46 |
1 files changed, 43 insertions, 3 deletions
diff --git a/drivers/staging/lustre/lustre/ldlm/interval_tree.c b/drivers/staging/lustre/lustre/ldlm/interval_tree.c index e1069021420d..19e285dd2ee1 100644 --- a/drivers/staging/lustre/lustre/ldlm/interval_tree.c +++ b/drivers/staging/lustre/lustre/ldlm/interval_tree.c @@ -34,9 +34,9 @@ * Author: Huang Wei <huangwei@clusterfs.com> * Author: Jay Xiong <jinshan.xiong@sun.com> */ -#include "../include/lustre_dlm.h" -#include "../include/obd_support.h" -#include "../include/interval_tree.h" +#include <lustre_dlm.h> +#include <obd_support.h> +#include <interval_tree.h> enum { INTERVAL_RED = 0, @@ -110,6 +110,15 @@ static struct interval_node *interval_first(struct interval_node *node) return node; } +static struct interval_node *interval_last(struct interval_node *node) +{ + if (!node) + return NULL; + while (node->in_right) + node = node->in_right; + return node; +} + static struct interval_node *interval_next(struct interval_node *node) { if (!node) @@ -121,6 +130,37 @@ static struct interval_node *interval_next(struct interval_node *node) return node->in_parent; } +static struct interval_node *interval_prev(struct interval_node *node) +{ + if (!node) + return NULL; + + if (node->in_left) + return interval_last(node->in_left); + + while (node->in_parent && node_is_left_child(node)) + node = node->in_parent; + + return node->in_parent; +} + +enum interval_iter interval_iterate_reverse(struct interval_node *root, + interval_callback_t func, + void *data) +{ + enum interval_iter rc = INTERVAL_ITER_CONT; + struct interval_node *node; + + for (node = interval_last(root); node; node = interval_prev(node)) { + rc = func(node, data); + if (rc == INTERVAL_ITER_STOP) + break; + } + + return rc; +} +EXPORT_SYMBOL(interval_iterate_reverse); + static void __rotate_change_maxhigh(struct interval_node *node, struct interval_node *rotate) { |