[PATCH] lib: add idr_replace

This patch adds idr_replace() to replace an existing pointer in a single
operation.

Device-mapper will use this to update the pointer it stored against a given
id.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/lib/idr.c b/lib/idr.c
index de19030a999b..4d096819511a 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -29,6 +29,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #endif
+#include <linux/err.h>
 #include <linux/string.h>
 #include <linux/idr.h>
 
@@ -398,6 +399,48 @@ void *idr_find(struct idr *idp, int id)
 }
 EXPORT_SYMBOL(idr_find);
 
+/**
+ * idr_replace - replace pointer for given id
+ * @idp: idr handle
+ * @ptr: pointer you want associated with the id
+ * @id: lookup key
+ *
+ * Replace the pointer registered with an id and return the old value.
+ * A -ENOENT return indicates that @id was not found.
+ * A -EINVAL return indicates that @id was not within valid constraints.
+ *
+ * The caller must serialize vs idr_find(), idr_get_new(), and idr_remove().
+ */
+void *idr_replace(struct idr *idp, void *ptr, int id)
+{
+        int n;
+        struct idr_layer *p, *old_p;
+
+        n = idp->layers * IDR_BITS;
+        p = idp->top;
+
+        id &= MAX_ID_MASK;
+
+        if (id >= (1 << n))
+                return ERR_PTR(-EINVAL);
+
+        n -= IDR_BITS;
+        while ((n > 0) && p) {
+                p = p->ary[(id >> n) & IDR_MASK];
+                n -= IDR_BITS;
+        }
+
+        n = id & IDR_MASK;
+        if (unlikely(p == NULL || !test_bit(n, &p->bitmap)))
+                return ERR_PTR(-ENOENT);
+
+        old_p = p->ary[n];
+        p->ary[n] = ptr;
+
+        return old_p;
+}
+EXPORT_SYMBOL(idr_replace);
+
 static void idr_cache_ctor(void * idr_layer, kmem_cache_t *idr_layer_cache,
                 unsigned long flags)
 {