1 files changed, 132 insertions, 0 deletions

diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c
new file mode 100644
index 000000000000..a907de565db3
--- /dev/null
+++ b/fs/xfs/kmem.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/slab.h>
+#include <linux/swap.h>
+#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
+#include "time.h"
+#include "kmem.h"
+#include "xfs_message.h"
+
+/*
+ * Greedy allocation.  May fail and may return vmalloced memory.
+ *
+ * Must be freed using kmem_free_large.
+ */
+void *
+kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize)
+{
+        void            *ptr;
+        size_t          kmsize = maxsize;
+
+        while (!(ptr = kmem_zalloc_large(kmsize))) {
+                if ((kmsize >>= 1) <= minsize)
+                        kmsize = minsize;
+        }
+        if (ptr)
+                *size = kmsize;
+        return ptr;
+}
+
+void *
+kmem_alloc(size_t size, unsigned int __nocast flags)
+{
+        int     retries = 0;
+        gfp_t   lflags = kmem_flags_convert(flags);
+        void    *ptr;
+
+        do {
+                ptr = kmalloc(size, lflags);
+                if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
+                        return ptr;
+                if (!(++retries % 100))
+                        xfs_err(NULL,
+                "possible memory allocation deadlock in %s (mode:0x%x)",
+                                        __func__, lflags);
+                congestion_wait(BLK_RW_ASYNC, HZ/50);
+        } while (1);
+}
+
+void *
+kmem_zalloc(size_t size, unsigned int __nocast flags)
+{
+        void    *ptr;
+
+        ptr = kmem_alloc(size, flags);
+        if (ptr)
+                memset((char *)ptr, 0, (int)size);
+        return ptr;
+}
+
+void
+kmem_free(const void *ptr)
+{
+        if (!is_vmalloc_addr(ptr)) {
+                kfree(ptr);
+        } else {
+                vfree(ptr);
+        }
+}
+
+void *
+kmem_realloc(const void *ptr, size_t newsize, size_t oldsize,
+             unsigned int __nocast flags)
+{
+        void    *new;
+
+        new = kmem_alloc(newsize, flags);
+        if (ptr) {
+                if (new)
+                        memcpy(new, ptr,
+                                ((oldsize < newsize) ? oldsize : newsize));
+                kmem_free(ptr);
+        }
+        return new;
+}
+
+void *
+kmem_zone_alloc(kmem_zone_t *zone, unsigned int __nocast flags)
+{
+        int     retries = 0;
+        gfp_t   lflags = kmem_flags_convert(flags);
+        void    *ptr;
+
+        do {
+                ptr = kmem_cache_alloc(zone, lflags);
+                if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
+                        return ptr;
+                if (!(++retries % 100))
+                        xfs_err(NULL,
+                "possible memory allocation deadlock in %s (mode:0x%x)",
+                                        __func__, lflags);
+                congestion_wait(BLK_RW_ASYNC, HZ/50);
+        } while (1);
+}
+
+void *
+kmem_zone_zalloc(kmem_zone_t *zone, unsigned int __nocast flags)
+{
+        void    *ptr;
+
+        ptr = kmem_zone_alloc(zone, flags);
+        if (ptr)
+                memset((char *)ptr, 0, kmem_cache_size(zone));
+        return ptr;
+}