LU-147 avoid 8k obd device amount limit

[fs/lustre-release.git] / libcfs / libcfs / linux / linux-mem.c

diff --git a/libcfs/libcfs/linux/linux-mem.c b/libcfs/libcfs/linux/linux-mem.c
index 04ccd4e..4d9637f 100644 (file)
--- a/libcfs/libcfs/linux/linux-mem.c
+++ b/libcfs/libcfs/linux/linux-mem.c
@@ -26,7 +26,7 @@
  * GPL HEADER END
  */
 /*
- * Copyright  2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  */
 /*
@@ -45,16 +45,6 @@ static unsigned int cfs_alloc_flags_to_gfp(u_int32_t flags)
 {
        unsigned int mflags = 0;
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
-        if (flags & CFS_ALLOC_ATOMIC)
-                mflags |= __GFP_HIGH;
-        else if (flags & CFS_ALLOC_WAIT)
-                mflags |= __GFP_WAIT;
-        else
-                mflags |= (__GFP_HIGH | __GFP_WAIT);
-        if (flags & CFS_ALLOC_IO)
-                mflags |= __GFP_IO | __GFP_HIGHIO;
-#else
         if (flags & CFS_ALLOC_ATOMIC)
                 mflags |= __GFP_HIGH;
         else
@@ -63,7 +53,6 @@ static unsigned int cfs_alloc_flags_to_gfp(u_int32_t flags)
                 mflags |= __GFP_NOWARN;
         if (flags & CFS_ALLOC_IO)
                 mflags |= __GFP_IO;
-#endif
         if (flags & CFS_ALLOC_FS)
                 mflags |= __GFP_FS;
         if (flags & CFS_ALLOC_HIGH)
@@ -100,18 +89,18 @@ cfs_free_large(void *addr)
        vfree(addr);
 }
 
-cfs_page_t *cfs_alloc_pages(unsigned int flags, unsigned int order)
+cfs_page_t *cfs_alloc_page(unsigned int flags)
 {
         /*
          * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
          * from here: this will lead to infinite recursion.
          */
-        return alloc_pages(cfs_alloc_flags_to_gfp(flags), order);
+        return alloc_page(cfs_alloc_flags_to_gfp(flags));
 }
 
-void __cfs_free_pages(cfs_page_t *page, unsigned int order)
+void cfs_free_page(cfs_page_t *page)
 {
-        __free_pages(page, order);
+        __free_page(page);
 }
 
 cfs_mem_cache_t *
@@ -148,12 +137,38 @@ cfs_mem_cache_free(cfs_mem_cache_t *cachep, void *objp)
         return kmem_cache_free(cachep, objp);
 }
 
+/**
+ * Returns true if \a addr is an address of an allocated object in a slab \a
+ * kmem. Used in assertions. This check is optimistically imprecise, i.e., it
+ * occasionally returns true for the incorrect addresses, but if it returns
+ * false, then the addresses is guaranteed to be incorrect.
+ */
+int cfs_mem_is_in_cache(const void *addr, const cfs_mem_cache_t *kmem)
+{
+#ifdef CONFIG_SLAB
+        struct page *page;
+
+        /*
+         * XXX Copy of mm/slab.c:virt_to_cache(). It won't work with other
+         * allocators, like slub and slob.
+         */
+        page = virt_to_page(addr);
+        if (unlikely(PageCompound(page)))
+                page = (struct page *)page->private;
+        return PageSlab(page) && ((void *)page->lru.next) == kmem;
+#else
+        return 1;
+#endif
+}
+EXPORT_SYMBOL(cfs_mem_is_in_cache);
+
+
 EXPORT_SYMBOL(cfs_alloc);
 EXPORT_SYMBOL(cfs_free);
 EXPORT_SYMBOL(cfs_alloc_large);
 EXPORT_SYMBOL(cfs_free_large);
-EXPORT_SYMBOL(cfs_alloc_pages);
-EXPORT_SYMBOL(__cfs_free_pages);
+EXPORT_SYMBOL(cfs_alloc_page);
+EXPORT_SYMBOL(cfs_free_page);
 EXPORT_SYMBOL(cfs_mem_cache_create);
 EXPORT_SYMBOL(cfs_mem_cache_destroy);
 EXPORT_SYMBOL(cfs_mem_cache_alloc);