[mirror_ubuntu-jammy-kernel.git] / fs / xfs / kmem.h

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef __XFS_SUPPORT_KMEM_H__
#define __XFS_SUPPORT_KMEM_H__

#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>

/*
 * General memory allocation interfaces
 */

typedef unsigned __bitwise xfs_km_flags_t;
#define KM_NOFS		((__force xfs_km_flags_t)0x0004u)
#define KM_MAYFAIL	((__force xfs_km_flags_t)0x0008u)
#define KM_ZERO		((__force xfs_km_flags_t)0x0010u)

/*
 * We use a special process flag to avoid recursive callbacks into
 * the filesystem during transactions.  We will also issue our own
 * warnings, so we explicitly skip any generic ones (silly of us).
 */
static inline gfp_t
kmem_flags_convert(xfs_km_flags_t flags)
{
	gfp_t	lflags;

	BUG_ON(flags & ~(KM_NOFS|KM_MAYFAIL|KM_ZERO));

	lflags = GFP_KERNEL | __GFP_NOWARN;
	if (flags & KM_NOFS)
		lflags &= ~__GFP_FS;

	/*
	 * Default page/slab allocator behavior is to retry for ever
	 * for small allocations. We can override this behavior by using
	 * __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long
	 * as it is feasible but rather fail than retry forever for all
	 * request sizes.
	 */
	if (flags & KM_MAYFAIL)
		lflags |= __GFP_RETRY_MAYFAIL;

	if (flags & KM_ZERO)
		lflags |= __GFP_ZERO;

	return lflags;
}

extern void *kmem_alloc(size_t, xfs_km_flags_t);
extern void *kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags);
extern void *kmem_alloc_large(size_t size, xfs_km_flags_t);
extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
static inline void  kmem_free(const void *ptr)
{
	kvfree(ptr);
}


static inline void *
kmem_zalloc(size_t size, xfs_km_flags_t flags)
{
	return kmem_alloc(size, flags | KM_ZERO);
}

static inline void *
kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
{
	return kmem_alloc_large(size, flags | KM_ZERO);
}

/*
 * Zone interfaces
 */

#define kmem_zone	kmem_cache
#define kmem_zone_t	struct kmem_cache

extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);

static inline void *
kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
{
	return kmem_zone_alloc(zone, flags | KM_ZERO);
}

static inline struct page *
kmem_to_page(void *addr)
{
	if (is_vmalloc_addr(addr))
		return vmalloc_to_page(addr);
	return virt_to_page(addr);
}

#endif /* __XFS_SUPPORT_KMEM_H__ */
Commit	Line	Data
0b61f8a4	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
7b718769 NS	3	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
7b718769 NS	4	* All Rights Reserved.
1da177e4 LT	5	*/
	6	#ifndef __XFS_SUPPORT_KMEM_H__
	7	#define __XFS_SUPPORT_KMEM_H__
	8
	9	#include <linux/slab.h>
	10	#include <linux/sched.h>
	11	#include <linux/mm.h>
bdfb0430	12	#include <linux/vmalloc.h>
1da177e4	13
8758280f NS	14	/*
	15	* General memory allocation interfaces
	16	*/
	17
77ba7877	18	typedef unsigned __bitwise xfs_km_flags_t;
77ba7877 AV	19	#define KM_NOFS ((__force xfs_km_flags_t)0x0004u)
77ba7877 AV	20	#define KM_MAYFAIL ((__force xfs_km_flags_t)0x0008u)
359d992b	21	#define KM_ZERO ((__force xfs_km_flags_t)0x0010u)
8758280f NS	22
	23	/*
	24	* We use a special process flag to avoid recursive callbacks into
	25	* the filesystem during transactions. We will also issue our own
	26	* warnings, so we explicitly skip any generic ones (silly of us).
	27	*/
	28	static inline gfp_t
77ba7877	29	kmem_flags_convert(xfs_km_flags_t flags)
1da177e4	30	{
8758280f	31	gfp_t lflags;
1da177e4	32
707e0dda	33	BUG_ON(flags & ~(KM_NOFS\|KM_MAYFAIL\|KM_ZERO));
1da177e4	34
707e0dda TH	35	lflags = GFP_KERNEL \| __GFP_NOWARN;
	36	if (flags & KM_NOFS)
	37	lflags &= ~__GFP_FS;
359d992b	38
91c63ecd MH	39	/*
	40	* Default page/slab allocator behavior is to retry for ever
	41	* for small allocations. We can override this behavior by using
	42	* __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long
	43	* as it is feasible but rather fail than retry forever for all
	44	* request sizes.
	45	*/
	46	if (flags & KM_MAYFAIL)
	47	lflags \|= __GFP_RETRY_MAYFAIL;
	48
359d992b GZ	49	if (flags & KM_ZERO)
	50	lflags \|= __GFP_ZERO;
	51
8758280f	52	return lflags;
1da177e4 LT	53	}
1da177e4 LT	54
77ba7877	55	extern void *kmem_alloc(size_t, xfs_km_flags_t);
f8f9ee47	56	extern void *kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags);
cb0a8d23	57	extern void *kmem_alloc_large(size_t size, xfs_km_flags_t);
664b60f6	58	extern void kmem_realloc(const void , size_t, xfs_km_flags_t);
f3d21552 WY	59	static inline void kmem_free(const void *ptr)
	60	{
	61	kvfree(ptr);
	62	}
8758280f	63
bdfb0430	64
359d992b GZ	65	static inline void *
	66	kmem_zalloc(size_t size, xfs_km_flags_t flags)
	67	{
	68	return kmem_alloc(size, flags \| KM_ZERO);
cb0a8d23 DC	69	}
	70
	71	static inline void *
	72	kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
	73	{
	74	return kmem_alloc_large(size, flags \| KM_ZERO);
359d992b GZ	75	}
359d992b GZ	76
8758280f NS	77	/*
	78	* Zone interfaces
	79	*/
	80
8758280f NS	81	#define kmem_zone kmem_cache
	82	#define kmem_zone_t struct kmem_cache
	83
77ba7877	84	extern void kmem_zone_alloc(kmem_zone_t , xfs_km_flags_t);
359d992b GZ	85
	86	static inline void *
	87	kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
	88	{
	89	return kmem_zone_alloc(zone, flags \| KM_ZERO);
	90	}
1da177e4	91
72945d86 CH	92	static inline struct page *
	93	kmem_to_page(void *addr)
	94	{
	95	if (is_vmalloc_addr(addr))
	96	return vmalloc_to_page(addr);
	97	return virt_to_page(addr);
	98	}
	99
1da177e4	100	#endif /* __XFS_SUPPORT_KMEM_H__ */