Improve capability to traverse inodes in the NuttX psuedo-filesystem; now returns statfs

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5005 42af7a65-404d-4744-a932-0658087f49c3

include/limits.h

@@ -49,8 +49,26 @@
 /********************************************************************************
  * Pre-processor Definitions
  ********************************************************************************/
+/* Default values for user configurable limits **********************************/
+/* Maximum number of bytes in a filename (not including terminating null). */
 
-/* Configurable limits required by POSIX
+#ifndef CONFIG_NAME_MAX
+#  define CONFIG_NAME_MAX 32
+#endif
+
+/* Maximum number of bytes in a pathname, including the terminating null
+ * character.
+ */
+
+#ifndef CONFIG_PATH_MAX
+#  if CONFIG_NAME_MAX < 64
+#    define CONFIG_PATH_MAX (4*CONFIG_NAME_MAX + 1)
+#  else
+#    define CONFIG_PATH_MAX 256
+#  endif
+#endif
+
+/* Configurable limits required by POSIX ****************************************
  *
  * Required for all implementations:
  *
@@ -62,7 +80,7 @@
  *   _POSIX_NAME_MAX       Number of bytes in a file or pathname component
  *   _POSIX_NGROUPS_MAX    Number supplementary group IDs
  *   _POSIX_OPEN_MAX       Number of files a task can have open at once
- *   _POSIX_PATH_MAX       Number of bytes in a full pathname
+ *   _POSIX_PATH_MAX       Number of bytes in a full pathname (including NULL)
  *   _POSIX_PIPE_BUF       Number of bytes for atomic write into pipe
  *   _POSIX_SSIZE_MAX      Largest filesystem write; also max value of ssize_t
  *   _POSIX_STREAM_MAX     Number of std I/O streams open at once
@@ -103,7 +121,7 @@
 #define _POSIX_NAME_MAX       CONFIG_NAME_MAX
 #define _POSIX_NGROUPS_MAX    0
 #define _POSIX_OPEN_MAX       CONFIG_NFILE_DESCRIPTORS
-#define _POSIX_PATH_MAX       255
+#define _POSIX_PATH_MAX       CONFIG_PATH_MAX
 #define _POSIX_PIPE_BUF       512
 #define _POSIX_SSIZE_MAX      INT_MAX
 #define _POSIX_STREAM_MAX     CONFIG_NFILE_STREAMS

include/nuttx/fs/fs.h

@@ -216,11 +216,16 @@ struct inode
 };
 #define FSNODE_SIZE(n) (sizeof(struct inode) + (n))
 
-/* Callback used by foreach_inode to traverse all inodes in the pseudo-
- * file system.
+/* Callback used by foreach_mountpoints to traverse all mountpoints in the
+ * pseudo-file system.
  */
 
-typedef int (*foreach_inode_t)(FAR struct inode *inode, FAR void *arg);
+#ifndef CONFIG_DISABLE_MOUNTPOUNT
+struct statfs;                    /* Forward reference */
+typedef int (*foreach_mountpoint_t)(FAR const char *mountpoint,
+                                    FAR struct statfs *statbuf,
+                                    FAR void *arg);
+#endif
 
 /* This is the underlying representation of an open file.  A file
  * descriptor is an index into an array of such types. The type associates
@@ -324,25 +329,6 @@ extern "C" {
 
 EXTERN void weak_function fs_initialize(void);
 
-/* fs_foreachinode.c ********************************************************/
-/****************************************************************************
- * Name: foreach_inode
- *
- * Description:
- *   Visit each inode in the pseudo-file system.  The traversal is terminated
- *   when the callback 'handler' returns a non-zero value, or when all of
- *   the inodes have been visited.
- *
- *   NOTE 1: Use with caution... The psuedo-file system is locked throughout
- *   the traversal.
- *   NOTE 2: The search algorithm is recursive and could, in principle, use
- *   an indeterminant amount of stack space.  This will not usually be a
- *   real work issue.
- *
- ****************************************************************************/
-
-EXTERN int foreach_inode(foreach_inode_t handler, FAR void *arg);
-
 /* fs_foreachmountpoint.c ***************************************************/
 /****************************************************************************
  * Name: foreach_mountpoint
@@ -365,7 +351,7 @@ EXTERN int foreach_inode(foreach_inode_t handler, FAR void *arg);
  ****************************************************************************/
 
 #ifndef CONFIG_DISABLE_MOUNTPOUNT
-EXTERN int foreach_mountpoint(foreach_inode_t handler, FAR void *arg);
+EXTERN int foreach_mountpoint(foreach_mountpoint_t handler, FAR void *arg);
 #endif
 
 /* fs_registerdriver.c ******************************************************/