Update bcachefs sources to 50847e296b34 bcachefs: Check subvol <-> inode pointers...

[bcachefs-tools-debian] / include / linux / darray.h

diff --git a/include/linux/darray.h b/include/linux/darray.h
new file mode 100644 (file)
index 0000000..ff167eb
--- /dev/null
+++ b/include/linux/darray.h
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * (C) 2022-2024 Kent Overstreet <kent.overstreet@linux.dev>
+ */
+#ifndef _LINUX_DARRAY_H
+#define _LINUX_DARRAY_H
+
+/*
+ * Dynamic arrays
+ *
+ * Inspired by CCAN's darray
+ */
+
+#include <linux/darray_types.h>
+#include <linux/slab.h>
+
+int __darray_resize_slowpath(darray_char *, size_t, size_t, gfp_t);
+
+static inline int __darray_resize(darray_char *d, size_t element_size,
+                                 size_t new_size, gfp_t gfp)
+{
+       return unlikely(new_size > d->size)
+               ? __darray_resize_slowpath(d, element_size, new_size, gfp)
+               : 0;
+}
+
+#define darray_resize_gfp(_d, _new_size, _gfp)                         \
+       unlikely(__darray_resize((darray_char *) (_d), sizeof((_d)->data[0]), (_new_size), _gfp))
+
+#define darray_resize(_d, _new_size)                                   \
+       darray_resize_gfp(_d, _new_size, GFP_KERNEL)
+
+static inline int __darray_make_room(darray_char *d, size_t t_size, size_t more, gfp_t gfp)
+{
+       return __darray_resize(d, t_size, d->nr + more, gfp);
+}
+
+#define darray_make_room_gfp(_d, _more, _gfp)                          \
+       __darray_make_room((darray_char *) (_d), sizeof((_d)->data[0]), (_more), _gfp)
+
+#define darray_make_room(_d, _more)                                    \
+       darray_make_room_gfp(_d, _more, GFP_KERNEL)
+
+#define darray_room(_d)                ((_d).size - (_d).nr)
+
+#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])
+
+/* Insert/remove items into the middle of a darray: */
+
+#define array_insert_item(_array, _nr, _pos, _new_item)                        \
+do {                                                                   \
+       memmove(&(_array)[(_pos) + 1],                                  \
+               &(_array)[(_pos)],                                      \
+               sizeof((_array)[0]) * ((_nr) - (_pos)));                \
+       (_nr)++;                                                        \
+       (_array)[(_pos)] = (_new_item);                                 \
+} while (0)
+
+#define array_remove_items(_array, _nr, _pos, _nr_to_remove)           \
+do {                                                                   \
+       (_nr) -= (_nr_to_remove);                                       \
+       memmove(&(_array)[(_pos)],                                      \
+               &(_array)[(_pos) + (_nr_to_remove)],                    \
+               sizeof((_array)[0]) * ((_nr) - (_pos)));                \
+} while (0)
+
+#define array_remove_item(_array, _nr, _pos)                           \
+       array_remove_items(_array, _nr, _pos, 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_remove_items(_d, _pos, _nr_to_remove)                   \
+       array_remove_items((_d)->data, (_d)->nr, (_pos) - (_d)->data, _nr_to_remove)
+
+#define darray_remove_item(_d, _pos)                                   \
+       darray_remove_items(_d, _pos, 1)
+
+/* Iteration: */
+
+#define __darray_for_each(_d, _i)                                      \
+       for ((_i) = (_d).data; _i < (_d).data + (_d).nr; _i++)
+
+#define darray_for_each(_d, _i)                                                \
+       for (typeof(&(_d).data[0]) _i = (_d).data; _i < (_d).data + (_d).nr; _i++)
+
+#define darray_for_each_reverse(_d, _i)                                        \
+       for (typeof(&(_d).data[0]) _i = (_d).data + (_d).nr - 1; _i >= (_d).data; --_i)
+
+#define darray_init(_d)                                                        \
+do {                                                                   \
+       (_d)->nr = 0;                                                   \
+       (_d)->size = ARRAY_SIZE((_d)->preallocated);                    \
+       (_d)->data = (_d)->size ? (_d)->preallocated : NULL;            \
+} while (0)
+
+#define darray_exit(_d)                                                        \
+do {                                                                   \
+       if (!ARRAY_SIZE((_d)->preallocated) ||                          \
+           (_d)->data != (_d)->preallocated)                           \
+               kvfree((_d)->data);                                     \
+       darray_init(_d);                                                \
+} while (0)
+
+#endif /* _LINUX_DARRAY_H */