NFS: Replace readdir's use of xxhash() with hash_64()

Both xxhash() and hash_64() appear to give similarly low collision
rates with a standard linearly increasing readdir offset. They both give
similarly higher collision rates when applied to ext4's offsets.

So switch to using the standard hash_64().

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 47a53b3..14a7222 100644 (file)
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -4,10 +4,6 @@ config NFS_FS
        depends on INET && FILE_LOCKING && MULTIUSER
        select LOCKD
        select SUNRPC
-       select CRYPTO
-       select CRYPTO_HASH
-       select XXHASH
-       select CRYPTO_XXHASH
        select NFS_ACL_SUPPORT if NFS_V3_ACL
        help
          Choose Y here if you want to access files residing on other

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 0365063..c6b263b 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -39,7 +39,7 @@
 #include <linux/sched.h>
 #include <linux/kmemleak.h>
 #include <linux/xattr.h>
-#include <linux/xxhash.h>
+#include <linux/hash.h>
 
 #include "delegation.h"
 #include "iostat.h"
@@ -350,10 +350,7 @@ out:
  * of directory cookies. Content is addressed by the value of the
  * cookie index of the first readdir entry in a page.
  *
- * The xxhash algorithm is chosen because it is fast, and is supposed
- * to result in a decent flat distribution of hashes.
- *
- * We then select only the first 18 bits to avoid issues with excessive
+ * We select only the first 18 bits to avoid issues with excessive
  * memory use for the page cache XArray. 18 bits should allow the caching
  * of 262144 pages of sequences of readdir entries. Since each page holds
  * 127 readdir entries for a typical 64-bit system, that works out to a
@@ -363,7 +360,7 @@ static pgoff_t nfs_readdir_page_cookie_hash(u64 cookie)
 {
        if (cookie == 0)
                return 0;
-       return xxhash(&cookie, sizeof(cookie), 0) & NFS_READDIR_COOKIE_MASK;
+       return hash_64(cookie, 18);
 }
 
 static bool nfs_readdir_page_validate(struct page *page, u64 last_cookie,