ext/libuv/src/unix/fs.c in libuv-0.12.2 vs ext/libuv/src/unix/fs.c in libuv-0.12.3

@@ -215,13 +215,21 @@
 
 
 static ssize_t uv__fs_read(uv_fs_t* req) {
   ssize_t result;
 
-  if (req->off < 0)
-    result = readv(req->file, (struct iovec*) req->bufs, req->nbufs);
-  else {
+  if (req->off < 0) {
+    if (req->nbufs == 1)
+      result = read(req->file, req->bufs[0].base, req->bufs[0].len);
+    else
+      result = readv(req->file, (struct iovec*) req->bufs, req->nbufs);
+  } else {
+    if (req->nbufs == 1) {
+      result = pread(req->file, req->bufs[0].base, req->bufs[0].len, req->off);
+      goto done;
+    }
+
 #if HAVE_PREADV
     result = preadv(req->file, (struct iovec*) req->bufs, req->nbufs, req->off);
 #else
 # if defined(__linux__)
     static int no_preadv;
@@ -263,10 +271,12 @@
       }
     }
 # endif
 #endif
   }
+
+done:
   if (req->bufs != req->bufsml)
     free(req->bufs);
   return result;
 }
 
@@ -581,13 +591,20 @@
 #if defined(__APPLE__)
   static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
   pthread_mutex_lock(&lock);
 #endif
 
-  if (req->off < 0)
-    r = writev(req->file, (struct iovec*) req->bufs, req->nbufs);
-  else {
+  if (req->off < 0) {
+    if (req->nbufs == 1)
+      r = write(req->file, req->bufs[0].base, req->bufs[0].len);
+    else
+      r = writev(req->file, (struct iovec*) req->bufs, req->nbufs);
+  } else {
+    if (req->nbufs == 1) {
+      r = pwrite(req->file, req->bufs[0].base, req->bufs[0].len, req->off);
+      goto done;
+    }
 #if HAVE_PREADV
     r = pwritev(req->file, (struct iovec*) req->bufs, req->nbufs, req->off);
 #else
 # if defined(__linux__)
     static int no_pwritev;
@@ -630,9 +647,10 @@
     }
 # endif
 #endif
   }
 
+done:
 #if defined(__APPLE__)
   pthread_mutex_unlock(&lock);
 #endif
 
   if (req->bufs != req->bufsml)