LU-3531 llite: move dir cache to MDC layer

[fs/lustre-release.git] / lustre / liblustre / llite_lib.h

diff --git a/lustre/liblustre/llite_lib.h b/lustre/liblustre/llite_lib.h
index 2b427c3..f26c201 100644 (file)
--- a/lustre/liblustre/llite_lib.h
+++ b/lustre/liblustre/llite_lib.h
@@ -445,4 +445,14 @@ static inline void i_size_write(struct inode *inode, loff_t i_sz)
 {
         inode->i_stbuf.st_size = i_sz;
 }
+
+static inline __u64 hash_x_index(__u64 hash, int hash64)
+{
+       if (BITS_PER_LONG == 32 && hash64)
+               hash >>= 32;
+       /* save hash 0 as index 0 because otherwise we'll save it at
+        * page index end (~0UL) and it causes truncate_inode_pages_range()
+        * to loop forever. */
+       return ~0ULL - (hash + !hash);
+}
 #endif