fs:add syncfs api for sync whole fs data

Signed-off-by: guohao15 <guohao15@xiaomi.com>

fs/vfs/Make.defs

@@ -25,7 +25,7 @@ CSRCS += fs_fchstat.c fs_fstat.c fs_fstatfs.c fs_ioctl.c fs_lseek.c
 CSRCS += fs_mkdir.c fs_open.c fs_poll.c fs_pread.c fs_pwrite.c fs_read.c
 CSRCS += fs_rename.c fs_rmdir.c fs_select.c fs_sendfile.c fs_stat.c
 CSRCS += fs_statfs.c fs_unlink.c fs_write.c fs_dir.c fs_fsync.c
-CSRCS += fs_truncate.c
+CSRCS += fs_syncfs.c fs_truncate.c
 
 # Certain interfaces are not available if there is no mountpoint support
 

fs/vfs/fs_syncfs.c

@@ -0,0 +1,102 @@
+/****************************************************************************
+ * fs/vfs/fs_syncfs.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/cancelpt.h>
+#include <nuttx/fs/fs.h>
+
+#include <errno.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: file_syncfs
+ *
+ * Description:
+ *   Equivalent to the standard syncsf() function except that is accepts a
+ *   struct file instance instead of a fd descriptor and it does not set
+ *   the errno variable
+ *
+ ****************************************************************************/
+
+int file_syncfs(FAR struct file *filep)
+{
+  FAR struct inode *inode = filep->f_inode;
+
+  if (inode != NULL)
+    {
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+      if (INODE_IS_MOUNTPT(inode) && inode->u.i_mops &&
+          inode->u.i_mops->syncfs)
+        {
+          return inode->u.i_mops->syncfs(inode);
+        }
+#endif /* !CONFIG_DISABLE_MOUNTPOINT */
+    }
+
+  return -EBADF;
+}
+
+/****************************************************************************
+ * Name: syncfs
+ *
+ * Description:
+ *   syncfs() is like sync(), but synchronizes just the filesystem
+ *   containing file referred to by the open file descriptor fd.
+ *
+ * Returned Value:
+ *   syncfs() returns 0 on success; on error, it returns -1 and sets
+ *   errno to indicate the error.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int syncfs(int fd)
+{
+  FAR struct file *filep;
+  int ret;
+
+  enter_cancellation_point();
+
+  ret = fs_getfilep(fd, &filep);
+  if (ret == OK)
+    {
+      DEBUGASSERT(filep != NULL);
+      ret = file_syncfs(filep);
+    }
+
+  leave_cancellation_point();
+
+  if (ret < 0)
+    {
+      set_errno(-ret);
+      ret = ERROR;
+    }
+
+  return ret;
+}
+

include/nuttx/cancelpt.h

@@ -33,14 +33,14 @@
  * clock_nanosleep() msgsnd()                 read()          sigwaitinfo()
  * close()           msync()                  readv()         sleep()
  * connect()         nanosleep()              recv()          system()
- * creat()           open()                   recvfrom()      tcdrain()
- * fcntl()           pause()                  recvmsg()       usleep()
- * fdatasync()       poll()                   select()        wait()
- * fsync()           pread()                  sem_timedwait() waitid()
- * getmsg()          pselect()                sem_wait()      waitpid()
- * getpmsg()         pthread_cond_timedwait() send()          write()
- * lockf()           pthread_cond_wait()      sendmsg()       writev()
- * mq_receive()      pthread_join()           sendto()
+ * creat()           open()                   recvfrom()      syncfs()
+ * fcntl()           pause()                  recvmsg()       tcdrain()
+ * fdatasync()       poll()                   select()        usleep()
+ * fsync()           pread()                  sem_timedwait() wait()
+ * getmsg()          pselect()                sem_wait()      waitid()
+ * getpmsg()         pthread_cond_timedwait() send()          waitpid()
+ * lockf()           pthread_cond_wait()      sendmsg()       write()
+ * mq_receive()      pthread_join()           sendto()        writev()
  * mq_send()         pthread_testcancel()     sigpause()
  * mq_timedreceive() putmsg()                 sigsuspend()
  *

include/nuttx/fs/fs.h

@@ -364,6 +364,7 @@ struct mountpt_operations
                        FAR struct stat *buf);
   CODE int     (*chstat)(FAR struct inode *mountpt, FAR const char *relpath,
                          FAR const struct stat *buf, int flags);
+  CODE int     (*syncfs)(FAR struct inode *mountpt);
 };
 #endif /* CONFIG_DISABLE_MOUNTPOINT */
 
@@ -1382,6 +1383,18 @@ off_t nx_seek(int fd, off_t offset, int whence);
 
 int file_fsync(FAR struct file *filep);
 
+/****************************************************************************
+ * Name: file_syncfs
+ *
+ * Description:
+ *   Equivalent to the standard syncsf() function except that is accepts a
+ *   struct file instance instead of a fd descriptor and it does not set
+ *   the errno variable
+ *
+ ****************************************************************************/
+
+int file_syncfs(FAR struct file *filep);
+
 /****************************************************************************
  * Name: file_truncate
  *

include/unistd.h

@@ -258,7 +258,6 @@
 
 /* Helpers and legacy compatibility definitions */
 
-#define syncfs(f)                        fsync(f)
 #define fdatasync(f)                     fsync(f)
 #define getdtablesize(f)                 ((int)sysconf(_SC_OPEN_MAX))
 #define getpagesize(f)                   ((int)sysconf(_SC_PAGESIZE))
@@ -441,6 +440,7 @@ int     setregid(gid_t rgid, gid_t egid);
 int     getentropy(FAR void *buffer, size_t length);
 
 void    sync(void);
+int     syncfs(int fd);
 
 #if CONFIG_FORTIFY_SOURCE > 0
 fortify_function(getcwd) FAR char *getcwd(FAR char *buf,