LU-1666 obdclass: reduce lock contention on coh_page_guard

[fs/lustre-release.git] / lustre / include / linux / lustre_patchless_compat.h

diff --git a/lustre/include/linux/lustre_patchless_compat.h b/lustre/include/linux/lustre_patchless_compat.h
index 621889d..9af47ef 100644 (file)
--- a/lustre/include/linux/lustre_patchless_compat.h
+++ b/lustre/include/linux/lustre_patchless_compat.h
@@ -37,7 +37,6 @@
 #ifndef LUSTRE_PATCHLESS_COMPAT_H
 #define LUSTRE_PATCHLESS_COMPAT_H
 
-#include <linux/lustre_version.h>
 #include <linux/fs.h>
 
 #ifndef HAVE_TRUNCATE_COMPLETE_PAGE
@@ -51,9 +50,6 @@
 
 #ifndef HAVE_DELETE_FROM_PAGE_CACHE /* 2.6.39 */
 #ifndef HAVE_REMOVE_FROM_PAGE_CACHE /* 2.6.35 - 2.6.38 */
-#ifdef HAVE_NR_PAGECACHE /* 2.6.18 */
-#define __dec_zone_page_state(page, flag) atomic_add(-1, &nr_pagecache);
-#endif /* HAVE_NR_PAGECACHE */
 
 /* XXX copy & paste from 2.6.15 kernel */
 static inline void ll_remove_from_page_cache(struct page *page)
@@ -106,21 +102,12 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
 }
 #endif /* !HAVE_TRUNCATE_COMPLETE_PAGE */
 
-#if !defined(HAVE_D_REHASH_COND) && !defined(HAVE___D_REHASH)
-/* megahack */
-static inline void d_rehash_cond(struct dentry * entry, int lock)
-{
-       if (!lock)
-               spin_unlock(&dcache_lock);
-
-       d_rehash(entry);
-
-       if (!lock)
-               spin_lock(&dcache_lock);
-}
-
-#define __d_rehash(dentry, lock) d_rehash_cond(dentry, lock)
-#endif /* !HAVE_D_REHASH_COND && !HAVE___D_REHASH*/
+#ifdef HAVE_DCACHE_LOCK
+#  define dget_dlock(d)                 dget_locked(d)
+#  define d_refcount(d)                 atomic_read(&(d)->d_count)
+#else
+#  define d_refcount(d)                 ((d)->d_count)
+#endif /* HAVE_DCACHE_LOCK */
 
 #ifdef ATTR_OPEN
 # define ATTR_FROM_OPEN ATTR_OPEN