xiaoxiang781216 commented on code in PR #8000:
URL: https://github.com/apache/nuttx/pull/8000#discussion_r1059915845


##########
include/nuttx/fs/fs.h:
##########
@@ -209,13 +211,19 @@ struct file_operations
   int     (*close)(FAR struct file *filep);
   ssize_t (*read)(FAR struct file *filep, FAR char *buffer, size_t buflen);
   ssize_t (*write)(FAR struct file *filep, FAR const char *buffer,
-                   size_t buflen);
+                    size_t buflen);
   off_t   (*seek)(FAR struct file *filep, off_t offset, int whence);
   int     (*ioctl)(FAR struct file *filep, int cmd, unsigned long arg);
+  int     (*truncate)(FAR struct file *filep, off_t length);
+  int     (*mmap)(FAR struct file *filep, FAR void **addr, off_t start,
+                  size_t length);
+  int     (*munmap)(FAR struct task_group_s *group, FAR struct mm_map_s *map,

Review Comment:
   This special case can be indicated by setting mm_map_s->group to NULL? we 
can add task_group_s * to mm_map_entry_s, so the callback can retrieve the 
addrenv as needed.



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