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authorTheodore Ts'o <tytso@mit.edu>2000-12-09 05:47:45 +0000
committerTheodore Ts'o <tytso@mit.edu>2000-12-09 05:47:45 +0000
commit586187372afea65ae685687505b49b40fc5f3212 (patch)
tree0c29e7ecd97594090e4b67d7ca6eadba82228a4c /include/linux/list.h
parent3e377db29466e8a7d960df27fa5c0b933a3fa581 (diff)
downloade2fsprogs-586187372afea65ae685687505b49b40fc5f3212.tar.gz
ChangeLog, jfs_user.h, mkjournal.c:
mkjournal.c (init_journal_superblock): Sync Stephen's changes which creates a V2 superblock instead of a V1 superblock. ChangeLog, jfs.h, jfs_compat.h, list.h: jfs.h, jfs_compat.h, list.h: New files added to support ext3.
Diffstat (limited to 'include/linux/list.h')
-rw-r--r--include/linux/list.h108
1 files changed, 108 insertions, 0 deletions
diff --git a/include/linux/list.h b/include/linux/list.h
new file mode 100644
index 00000000..0e26f1fb
--- /dev/null
+++ b/include/linux/list.h
@@ -0,0 +1,108 @@
+#ifndef _LINUX_LIST_H
+#define _LINUX_LIST_H
+
+/*
+ * Simple doubly linked list implementation.
+ *
+ * Some of the internal functions ("__xxx") are useful when
+ * manipulating whole lists rather than single entries, as
+ * sometimes we already know the next/prev entries and we can
+ * generate better code by using them directly rather than
+ * using the generic single-entry routines.
+ */
+
+struct list_head {
+ struct list_head *next, *prev;
+};
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+ struct list_head name = { &name, &name }
+
+#define INIT_LIST_HEAD(ptr) do { \
+ (ptr)->next = (ptr); (ptr)->prev = (ptr); \
+} while (0)
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static __inline__ void __list_add(struct list_head * new,
+ struct list_head * prev,
+ struct list_head * next)
+{
+ next->prev = new;
+ new->next = next;
+ new->prev = prev;
+ prev->next = new;
+}
+
+/*
+ * Insert a new entry after the specified head..
+ */
+static __inline__ void list_add(struct list_head *new, struct list_head *head)
+{
+ __list_add(new, head, head->next);
+}
+
+/*
+ * Insert a new entry at the tail
+ */
+static __inline__ void list_add_tail(struct list_head *new, struct list_head *head)
+{
+ __list_add(new, head->prev, head);
+}
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static __inline__ void __list_del(struct list_head * prev,
+ struct list_head * next)
+{
+ next->prev = prev;
+ prev->next = next;
+}
+
+static __inline__ void list_del(struct list_head *entry)
+{
+ __list_del(entry->prev, entry->next);
+}
+
+static __inline__ int list_empty(struct list_head *head)
+{
+ return head->next == head;
+}
+
+/*
+ * Splice in "list" into "head"
+ */
+static __inline__ void list_splice(struct list_head *list, struct list_head *head)
+{
+ struct list_head *first = list->next;
+
+ if (first != list) {
+ struct list_head *last = list->prev;
+ struct list_head *at = head->next;
+
+ first->prev = head;
+ head->next = first;
+
+ last->next = at;
+ at->prev = last;
+ }
+}
+
+#define list_entry(ptr, type, member) \
+ ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+
+#define list_for_each(pos, head) \
+ for (pos = (head)->next; pos != (head); pos = pos->next)
+
+#endif