[linux-block.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)
#define KM_NOLOCKDEP	((__force xfs_km_flags_t)0x0020u)

/*
 * 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 | KM_NOLOCKDEP));

	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;

	if (flags & KM_NOLOCKDEP)
		lflags |= __GFP_NOLOCKDEP;

	return lflags;
}

extern void *kmem_alloc(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);
}

/*
 * Zone interfaces
 */
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
508578f2	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)
6dcde60e	22	#define KM_NOLOCKDEP ((__force xfs_km_flags_t)0x0020u)
8758280f NS	23
	24	/*
	25	* We use a special process flag to avoid recursive callbacks into
	26	* the filesystem during transactions. We will also issue our own
	27	* warnings, so we explicitly skip any generic ones (silly of us).
	28	*/
	29	static inline gfp_t
77ba7877	30	kmem_flags_convert(xfs_km_flags_t flags)
1da177e4	31	{
8758280f	32	gfp_t lflags;
1da177e4	33
6dcde60e	34	BUG_ON(flags & ~(KM_NOFS \| KM_MAYFAIL \| KM_ZERO \| KM_NOLOCKDEP));
1da177e4	35
707e0dda TH	36	lflags = GFP_KERNEL \| __GFP_NOWARN;
	37	if (flags & KM_NOFS)
	38	lflags &= ~__GFP_FS;
359d992b	39
91c63ecd MH	40	/*
	41	* Default page/slab allocator behavior is to retry for ever
	42	* for small allocations. We can override this behavior by using
	43	* __GFP_RETRY_MAYFAIL which will tell the allocator to retry as long
	44	* as it is feasible but rather fail than retry forever for all
	45	* request sizes.
	46	*/
	47	if (flags & KM_MAYFAIL)
	48	lflags \|= __GFP_RETRY_MAYFAIL;
	49
359d992b GZ	50	if (flags & KM_ZERO)
	51	lflags \|= __GFP_ZERO;
	52
6dcde60e DW	53	if (flags & KM_NOLOCKDEP)
	54	lflags \|= __GFP_NOLOCKDEP;
	55
8758280f	56	return lflags;
1da177e4 LT	57	}
1da177e4 LT	58
77ba7877	59	extern void *kmem_alloc(size_t, xfs_km_flags_t);
f3d21552 WY	60	static inline void kmem_free(const void *ptr)
	61	{
	62	kvfree(ptr);
	63	}
8758280f	64
bdfb0430	65
359d992b GZ	66	static inline void *
	67	kmem_zalloc(size_t size, xfs_km_flags_t flags)
	68	{
	69	return kmem_alloc(size, flags \| KM_ZERO);
cb0a8d23 DC	70	}
cb0a8d23 DC	71
8758280f NS	72	/*
	73	* Zone interfaces
	74	*/
72945d86 CH	75	static inline struct page *
	76	kmem_to_page(void *addr)
	77	{
	78	if (is_vmalloc_addr(addr))
	79	return vmalloc_to_page(addr);
	80	return virt_to_page(addr);
	81	}
	82
1da177e4	83	#endif /* __XFS_SUPPORT_KMEM_H__ */