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); | ||