[PATCH] server: implement file random access hint on OS X

[Luke Deller]

Disable read ahead for files opened with FILE_RANDOM_ACCESS hint on
Mac OS X and FreeBSD.

Signed-off-by: Luke Deller 
---
 server/fd.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/server/fd.c b/server/fd.c
index c9a21186722..ebcbd4266cc 100644
--- a/server/fd.c
+++ b/server/fd.c
@@ -2054,6 +2054,13 @@ struct fd *open_fd( struct fd *root, const char *name, struct unicode_str nt_nam
         posix_fadvise( fd->unix_fd, 0, 0, POSIX_FADV_RANDOM );
         break;
     }
+#elif defined F_RDAHEAD /* Mac OS X, FreeBSD */
+    switch (options & (FILE_SEQUENTIAL_ONLY | FILE_RANDOM_ACCESS))
+    {
+    case FILE_RANDOM_ACCESS:
+        fcntl( fd->unix_fd, F_RDAHEAD, 0 );
+        break;
+    }
 #endif

if (root_fd != -1) fchdir( server_dir_fd ); /* go back to the server dir */