Filesystem: PR1398: Fix lseek() mechanic

According to POSIX the lseek() function shall not, by itself, extend the
size of a file.

Remove the size field of rtems_libio_t.  A file has only one size but
may have multiple open file descriptors.  Thus a file size field in the
file descriptor may lead to inconsistencies.

New default handlers rtems_filesystem_default_lseek_file() and
rtems_filesystem_default_lseek_directory().

1 files changed, 0 insertions, 38 deletions

diff --git a/cpukit/libfs/src/imfs/imfs_directory.c b/cpukit/libfs/src/imfs/imfs_directory.c
index c6be71ffcc..f77b68bc14 100644
--- a/cpukit/libfs/src/imfs/imfs_directory.c
+++ b/cpukit/libfs/src/imfs/imfs_directory.c
@@ -99,41 +99,3 @@ ssize_t imfs_dir_read(
 
    return bytes_transferred;
 }
-
-/*
- *  imfs_dir_lseek
- *
- *  This routine will behave in one of three ways based on the state of
- *  argument whence. Based on the state of its value the offset argument will
- *  be interpreted using one of the following methods:
- *
- *     SEEK_SET - offset is the absolute byte offset from the start of the
- *                logical start of the dirent sequence that represents the
- *                directory
- *     SEEK_CUR - offset is used as the relative byte offset from the current
- *                directory position index held in the iop structure
- *     SEEK_END - N/A --> This will cause an EINVAL to be returned.
- */
-
-off_t imfs_dir_lseek(
-  rtems_libio_t  *iop,
-  off_t           offset,
-  int             whence
-)
-{
-  switch( whence ) {
-     case SEEK_SET:   /* absolute move from the start of the file */
-     case SEEK_CUR:   /* relative move */
-        iop->offset = (iop->offset/sizeof(struct dirent)) *
-              sizeof(struct dirent);
-        break;
-
-     case SEEK_END:   /* Movement past the end of the directory via lseek */
-                      /* is not a permitted operation                     */
-      default:
-        rtems_set_errno_and_return_minus_one( EINVAL );
-        break;
-  }
-
-  return 0;
-}