LXR linux/fs/xfs/kmem.h

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   4 * All Rights Reserved.
   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>
  12#include <linux/vmalloc.h>
  13
  14/*
  15 * General memory allocation interfaces
  16 */
  17
  18typedef unsigned __bitwise xfs_km_flags_t;
  19#define KM_NOFS         ((__force xfs_km_flags_t)0x0004u)
  20#define KM_MAYFAIL      ((__force xfs_km_flags_t)0x0008u)
  21#define KM_ZERO         ((__force xfs_km_flags_t)0x0010u)
  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 */
  28static inline gfp_t
  29kmem_flags_convert(xfs_km_flags_t flags)
  30{
  31        gfp_t   lflags;
  32
  33        BUG_ON(flags & ~(KM_NOFS|KM_MAYFAIL|KM_ZERO));
  34
  35        lflags = GFP_KERNEL | __GFP_NOWARN;
  36        if (flags & KM_NOFS)
  37                lflags &= ~__GFP_FS;
  38
  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
  49        if (flags & KM_ZERO)
  50                lflags |= __GFP_ZERO;
  51
  52        return lflags;
  53}
  54
  55extern void *kmem_alloc(size_t, xfs_km_flags_t);
  56extern void *kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags);
  57extern void *kmem_alloc_large(size_t size, xfs_km_flags_t);
  58extern void *kmem_realloc(const void *, size_t, xfs_km_flags_t);
  59static inline void  kmem_free(const void *ptr)
  60{
  61        kvfree(ptr);
  62}
  63
  64
  65static inline void *
  66kmem_zalloc(size_t size, xfs_km_flags_t flags)
  67{
  68        return kmem_alloc(size, flags | KM_ZERO);
  69}
  70
  71static inline void *
  72kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
  73{
  74        return kmem_alloc_large(size, flags | KM_ZERO);
  75}
  76
  77/*
  78 * Zone interfaces
  79 */
  80
  81#define kmem_zone       kmem_cache
  82#define kmem_zone_t     struct kmem_cache
  83
  84extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
  85
  86static inline void *
  87kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
  88{
  89        return kmem_zone_alloc(zone, flags | KM_ZERO);
  90}
  91
  92static inline struct page *
  93kmem_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
 100#endif /* __XFS_SUPPORT_KMEM_H__ */
 101