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// SPDX-License-Identifier: GPL-2.0+/* * XArray implementation * Copyright (c) 2017 Microsoft Corporation * Author: Matthew Wilcox <willy@infradead.org> *//* * Coding conventions in this file: * * @xa is used to refer to the entire xarray. * @xas is the 'xarray operation state'. It may be either a pointer to * an xa_state, or an xa_state stored on the stack. This is an unfortunate * ambiguity. * @index is the index of the entry being operated on * @mark is an xa_mark_t; a small number indicating one of the mark bits. * @node refers to an xa_node; usually the primary one being operated on by * this function. * @offset is the index into the slots array inside an xa_node. * @parent refers to the @xa_node closer to the head than @node. * @entry refers to something stored in a slot in the xarray */static inline unsigned int xa_lock_type(const struct xarray *xa){ return (__force unsigned int)xa->xa_flags & 3;}static inline void xas_lock_type(struct xa_state *xas, unsigned int lock_type){ if (lock_type == XA_LOCK_IRQ) xas_lock_irq(xas); else if (lock_type == XA_LOCK_BH) xas_lock_bh(xas); else xas_lock(xas);}static inline void xas_unlock_type(struct xa_state *xas, unsigned int lock_type){ if (lock_type == XA_LOCK_IRQ) xas_unlock_irq(xas); else if (lock_type == XA_LOCK_BH) xas_unlock_bh(xas); else xas_unlock(xas);}static inline bool xa_track_free(const struct xarray *xa){ return xa->xa_flags & XA_FLAGS_TRACK_FREE;}static inline bool xa_zero_busy(const struct xarray *xa){ return xa->xa_flags & XA_FLAGS_ZERO_BUSY;}static inline void xa_mark_set(struct xarray *xa, xa_mark_t mark){ if (!(xa->xa_flags & XA_FLAGS_MARK(mark))) xa->xa_flags |= XA_FLAGS_MARK(mark);}static inline void xa_mark_clear(struct xarray *xa, xa_mark_t mark){ if (xa->xa_flags & XA_FLAGS_MARK(mark)) xa->xa_flags &= ~(XA_FLAGS_MARK(mark));}static inline unsigned long *node_marks(struct xa_node *node, xa_mark_t mark){ return node->marks[(__force unsigned)mark];}static inline bool node_get_mark(struct xa_node *node, unsigned int offset, xa_mark_t mark){ return test_bit(offset, node_marks(node, mark));}/* returns true if the bit was set */static inline bool node_set_mark(struct xa_node *node, unsigned int offset, xa_mark_t mark){ return __test_and_set_bit(offset, node_marks(node, mark));