fs/pseudofile: config pseudofile feature

Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>

fs/Kconfig

@@ -94,6 +94,13 @@ config PSEUDOFS_SOFTLINKS
 		to link a directory in the pseudo-file system, such as /bin, to
 		to a directory in a mounted volume, say /mnt/sdcard/bin.
 
+config PSEUDOFS_FILE
+	bool "Pseudo file support"
+	default n
+	depends on !DISABLE_PSEUDOFS_OPERATIONS
+	---help---
+		Support to create a file on pseudo filesystem.
+
 config SENDFILE_BUFSIZE
 	int "sendfile() buffer size"
 	default 512

fs/inode/inode.h

@@ -427,8 +427,10 @@ int dir_allocate(FAR struct file *filep, FAR const char *relpath);
  *
  ****************************************************************************/
 
+#ifdef CONFIG_PSEUDOFS_FILE
 int pseudofile_create(FAR struct inode **node, FAR const char *path,
                       mode_t mode);
+#endif
 
 /****************************************************************************
  * Name: inode_is_pseudofile
@@ -438,7 +440,9 @@ int pseudofile_create(FAR struct inode **node, FAR const char *path,
  *
  ****************************************************************************/
 
+#ifdef CONFIG_PSEUDOFS_FILE
 bool inode_is_pseudofile(FAR struct inode *inode);
+#endif
 
 #undef EXTERN
 #if defined(__cplusplus)

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 fs_pseudofile.c
+CSRCS += fs_truncate.c
 
 # Certain interfaces are not available if there is no mountpoint support
 
@@ -33,6 +33,12 @@ ifneq ($(CONFIG_PSEUDOFS_SOFTLINKS),0)
 CSRCS += fs_link.c fs_symlink.c fs_readlink.c
 endif
 
+# Pseudofile support
+
+ifeq ($(CONFIG_PSEUDOFS_FILE),y)
+CSRCS += fs_pseudofile.c
+endif
+
 # Stream support
 
 ifeq ($(CONFIG_FILE_STREAM),y)

fs/vfs/fs_open.c

@@ -104,7 +104,7 @@ static int file_vopen(FAR struct file *filep, FAR const char *path,
   ret = inode_find(&desc);
   if (ret < 0)
     {
-#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
+#ifdef CONFIG_PSEUDOFS_FILE
       if ((oflags & O_CREAT) != 0)
         {
           ret = pseudofile_create(&desc.node, path, mode);

fs/vfs/fs_stat.c

@@ -416,12 +416,15 @@ int inode_stat(FAR struct inode *inode, FAR struct stat *buf, int resolve)
         {
           /* What is it if it also has child inodes? */
 
+#ifdef CONFIG_PSEUDOFS_FILE
           buf->st_size = inode->i_size;
+
           if (inode_is_pseudofile(inode))
             {
               buf->st_mode |= S_IFREG;
             }
           else
+#endif
             {
               buf->st_mode |= S_IFCHR;
             }

include/nuttx/fs/fs.h

@@ -405,7 +405,9 @@ struct inode
   uint16_t          i_flags;    /* Flags for inode */
   union inode_ops_u u;          /* Inode operations */
   ino_t             i_ino;      /* Inode serial number */
+#ifdef CONFIG_PSEUDOFS_FILE
   size_t            i_size;     /* The size of per inode driver */
+#endif
 #ifdef CONFIG_PSEUDOFS_ATTRIBUTES
   mode_t            i_mode;     /* Access mode flags */
   uid_t             i_owner;    /* Owner */