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__ */