summaryrefslogtreecommitdiff
path: root/fs/bcachefs/darray.h
diff options
context:
space:
mode:
Diffstat (limited to 'fs/bcachefs/darray.h')
-rw-r--r--fs/bcachefs/darray.h87
1 files changed, 87 insertions, 0 deletions
diff --git a/fs/bcachefs/darray.h b/fs/bcachefs/darray.h
new file mode 100644
index 000000000000..114f86b45fd5
--- /dev/null
+++ b/fs/bcachefs/darray.h
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_DARRAY_H
+#define _BCACHEFS_DARRAY_H
+
+/*
+ * Dynamic arrays:
+ *
+ * Inspired by CCAN's darray
+ */
+
+#include "util.h"
+#include <linux/slab.h>
+
+#define DARRAY(type) \
+struct { \
+ size_t nr, size; \
+ type *data; \
+}
+
+typedef DARRAY(void) darray_void;
+
+static inline int __darray_make_room(darray_void *d, size_t t_size, size_t more, gfp_t gfp)
+{
+ if (d->nr + more > d->size) {
+ size_t new_size = roundup_pow_of_two(d->nr + more);
+ void *data = krealloc_array(d->data, new_size, t_size, gfp);
+
+ if (!data)
+ return -ENOMEM;
+
+ d->data = data;
+ d->size = new_size;
+ }
+
+ return 0;
+}
+
+#define darray_make_room_gfp(_d, _more, _gfp) \
+ __darray_make_room((darray_void *) (_d), sizeof((_d)->data[0]), (_more), _gfp)
+
+#define darray_make_room(_d, _more) \
+ darray_make_room_gfp(_d, _more, GFP_KERNEL)
+
+#define darray_top(_d) ((_d).data[(_d).nr])
+
+#define darray_push_gfp(_d, _item, _gfp) \
+({ \
+ int _ret = darray_make_room_gfp((_d), 1, _gfp); \
+ \
+ if (!_ret) \
+ (_d)->data[(_d)->nr++] = (_item); \
+ _ret; \
+})
+
+#define darray_push(_d, _item) darray_push_gfp(_d, _item, GFP_KERNEL)
+
+#define darray_pop(_d) ((_d)->data[--(_d)->nr])
+
+#define darray_first(_d) ((_d).data[0])
+#define darray_last(_d) ((_d).data[(_d).nr - 1])
+
+#define darray_insert_item(_d, pos, _item) \
+({ \
+ size_t _pos = (pos); \
+ int _ret = darray_make_room((_d), 1); \
+ \
+ if (!_ret) \
+ array_insert_item((_d)->data, (_d)->nr, _pos, (_item)); \
+ _ret; \
+})
+
+#define darray_for_each(_d, _i) \
+ for (_i = (_d).data; _i < (_d).data + (_d).nr; _i++)
+
+#define darray_init(_d) \
+do { \
+ (_d)->data = NULL; \
+ (_d)->nr = (_d)->size = 0; \
+} while (0)
+
+#define darray_exit(_d) \
+do { \
+ kfree((_d)->data); \
+ darray_init(_d); \
+} while (0)
+
+#endif /* _BCACHEFS_DARRAY_H */