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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /fs/xfs/kmem.h | |
parent | Initial commit. (diff) | |
download | linux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip |
Adding upstream version 4.19.249.upstream/4.19.249
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | fs/xfs/kmem.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/fs/xfs/kmem.h b/fs/xfs/kmem.h new file mode 100644 index 000000000..8e6b3ba81 --- /dev/null +++ b/fs/xfs/kmem.h @@ -0,0 +1,127 @@ +// 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_SLEEP ((__force xfs_km_flags_t)0x0001u) +#define KM_NOSLEEP ((__force xfs_km_flags_t)0x0002u) +#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_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_ZERO)); + + if (flags & KM_NOSLEEP) { + lflags = GFP_ATOMIC | __GFP_NOWARN; + } else { + 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_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 KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN +#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT +#define KM_ZONE_SPREAD SLAB_MEM_SPREAD +#define KM_ZONE_ACCOUNT SLAB_ACCOUNT + +#define kmem_zone kmem_cache +#define kmem_zone_t struct kmem_cache + +static inline kmem_zone_t * +kmem_zone_init(int size, char *zone_name) +{ + return kmem_cache_create(zone_name, size, 0, 0, NULL); +} + +static inline kmem_zone_t * +kmem_zone_init_flags(int size, char *zone_name, slab_flags_t flags, + void (*construct)(void *)) +{ + return kmem_cache_create(zone_name, size, 0, flags, construct); +} + +static inline void +kmem_zone_free(kmem_zone_t *zone, void *ptr) +{ + kmem_cache_free(zone, ptr); +} + +static inline void +kmem_zone_destroy(kmem_zone_t *zone) +{ + kmem_cache_destroy(zone); +} + +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); +} + +#endif /* __XFS_SUPPORT_KMEM_H__ */ |