This is a direct replacement for struct radix_tree_root. Some of the struct members have changed name; convert those, and use a #define so that radix_tree users continue to work without change.
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| 1 | +// SPDX-License-Identifier: GPL-2.0+ | |
| 2 | +/* | |
| 3 | + * XArray implementation | |
| 4 | + * Copyright (c) 2017 Microsoft Corporation | |
| 5 | + * Author: Matthew Wilcox <willy@infradead.org> | |
| 6 | + */ | |
| 7 | + | |
| 8 | +#include <linux/export.h> | |
| 9 | +#include <linux/xarray.h> | |
| 10 | + | |
| 11 | +/* | |
| 12 | + * Coding conventions in this file: | |
| 13 | + * | |
| 14 | + * @xa is used to refer to the entire xarray. | |
| 15 | + * @xas is the 'xarray operation state'. It may be either a pointer to | |
| 16 | + * an xa_state, or an xa_state stored on the stack. This is an unfortunate | |
| 17 | + * ambiguity. | |
| 18 | + * @index is the index of the entry being operated on | |
| 19 | + * @mark is an xa_mark_t; a small number indicating one of the mark bits. | |
| 20 | + * @node refers to an xa_node; usually the primary one being operated on by | |
| 21 | + * this function. | |
| 22 | + * @offset is the index into the slots array inside an xa_node. | |
| 23 | + * @parent refers to the @xa_node closer to the head than @node. | |
| 24 | + * @entry refers to something stored in a slot in the xarray | |
| 25 | + */ | |
| 26 | + | |
| 27 | +/** | |
| 28 | + * xa_init_flags() - Initialise an empty XArray with flags. | |
| 29 | + * @xa: XArray. | |
| 30 | + * @flags: XA_FLAG values. | |
| 31 | + * | |
| 32 | + * If you need to initialise an XArray with special flags (eg you need | |
| 33 | + * to take the lock from interrupt context), use this function instead | |
| 34 | + * of xa_init(). | |
| 35 | + * | |
| 36 | + * Context: Any context. | |
| 37 | + */ | |
| 38 | +void xa_init_flags(struct xarray *xa, gfp_t flags) | |
| 39 | +{ | |
| 40 | + spin_lock_init(&xa->xa_lock); | |
| 41 | + xa->xa_flags = flags; | |
| 42 | + xa->xa_head = NULL; | |
| 43 | +} | |
| 44 | +EXPORT_SYMBOL(xa_init_flags); | |