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-              r4db6eaf
+              r10d6b858
  */
 typedef struct {
+        /** Serializes access to this open file. */
+        futex_t lock;
         vfs_node_t *node;

uspace/srv/vfs/vfs_file.c

r4db6eaf	r10d6b858
87	87	return ENOMEM;
88	88	memset(files[i], 0, sizeof(vfs_file_t));
	89	futex_initialize(&files[i]->lock, 1);
89	90	vfs_file_addref(files[i]);
90	91	return i;

-              r4db6eaf
+              r10d6b858
         /*
+         * Lock the open file structure so that no other thread can manipulate
+         * the same open file at a time.
+         */
+        futex_down(&file->lock);
+        /*
          * Lock the file's node so that no other client can read/write to it at
          * the same time.
 …
         /*
          * Update the position pointer.
+         * Update the position pointer and unlock the open file.
          */
         file->pos += bytes;
+        futex_up(&file->lock);
         /*

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