diff options
Diffstat (limited to 'cpukit/libcsupport/src/unmount.c')
| -rw-r--r-- | cpukit/libcsupport/src/unmount.c | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/cpukit/libcsupport/src/unmount.c b/cpukit/libcsupport/src/unmount.c deleted file mode 100644 index c4b6bdae7d..0000000000 --- a/cpukit/libcsupport/src/unmount.c +++ /dev/null @@ -1,223 +0,0 @@ -/* - * unmount() - Unmount a File System - * - * This routine is not defined in the POSIX 1003.1b standard but - * in some form is supported on most UNIX and POSIX systems. This - * routine is necessary to mount instantiations of a file system - * into the file system name space. - * - * COPYRIGHT (c) 1989-1999. - * On-Line Applications Research Corporation (OAR). - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.OARcorp.com/rtems/license.html. - * - * $Id$ - */ - -#include <sys/types.h> -#include <sys/stat.h> -#include <chain.h> -#include <fcntl.h> -#include <unistd.h> -#include <errno.h> -#include <stdlib.h> -#include <string.h> -#include <assert.h> - -#include "imfs.h" -#include "libio_.h" - -/* - * Data structures and routines private to mount/unmount pair. - */ - -extern Chain_Control rtems_filesystem_mount_table_control; -extern rtems_filesystem_location_info_t rtems_filesystem_current; - -int search_mt_for_mount_point( - rtems_filesystem_location_info_t *location_of_mount_point -); - - -int file_systems_below_this_mountpoint( - const char *mount_path, - rtems_filesystem_location_info_t *temp_loc, - rtems_filesystem_mount_table_entry_t *temp_mt_entry -); - -/* - * unmount - * - * This routine will attempt to unmount the file system that has been - * is mounted a mount_path. If the operation is successful, 0 will - * be returned to the calling routine. Otherwise, 1 will be returned. - */ - -int unmount( - const char *mount_path -) -{ - int status; - rtems_filesystem_location_info_t temp_loc; - rtems_filesystem_mount_table_entry_t temp_mt_entry; - int result; - - /* - * Are there any file systems below the mount_path specified - */ - - status = file_systems_below_this_mountpoint( - mount_path, - &temp_loc, - &temp_mt_entry - ); - - if ( status != 0 ) - return -1; - - /* - * Is the current node reference pointing to a node in the file system - * we are attempting to unmount ? - */ - - if ( rtems_filesystem_current.mt_entry == temp_loc.mt_entry ) { - rtems_filesystem_freenode( &temp_loc ); - set_errno_and_return_minus_one( EBUSY ); - } - - /* - * Run the file descriptor table to determine if there are any file - * descriptors that are currently active and reference nodes in the - * file system that we are trying to unmount - */ - - if ( rtems_libio_is_open_files_in_fs( temp_loc.mt_entry ) == 1 ) { - rtems_filesystem_freenode( &temp_loc ); - set_errno_and_return_minus_one( EBUSY ); - } - - /* - * Allow the file system being mounted on to do its cleanup. - * XXX - Did I change these correctly ??? It looks like either I did - * XXX this backwards or the IMFS_unmount and IMFS_fsumount are swaped. - * XXX Add to the mt_point_node unmount to set the mt_entry back to null - * XXX I will step off in space when evaluating past the end of the node. - */ - - if ((temp_mt_entry.mt_point_node.ops->unmount )( temp_loc.mt_entry ) != 0 ) { - rtems_filesystem_freenode( &temp_loc ); - return -1; - } - - /* - * Run the unmount function for the subordinate file system. - */ - - if ((temp_mt_entry.mt_fs_root.ops->fsunmount_me )( temp_loc.mt_entry ) != 0){ - rtems_filesystem_freenode( &temp_loc ); - return -1; - } - - /* - * Allow the file system to clean up. - */ - - result = (*temp_loc.ops->fsunmount_me)( temp_loc.mt_entry ); - - /* - * Extract the mount table entry from the chain - */ - - Chain_Extract( ( Chain_Node * ) temp_loc.mt_entry ); - - /* - * Free the memory associated with the extracted mount table entry. - */ - - rtems_filesystem_freenode( &temp_loc.mt_entry->mt_point_node ); - free( temp_loc.mt_entry ); - rtems_filesystem_freenode( &temp_loc ); - - return result; - -} - - -/* - * file_systems_below_this_mountpoint - * - * This routine will run through the entries that currently exist in the - * mount table chain. For each entry in the mount table chain it will - * compare the mount tables mt_fs_root to the new_fs_root_node. If any of the - * mount table file system root nodes matches the new file system root node - * this indicates that we are trying to mount a file system that has already - * been mounted. This is not a permitted operation. temp_loc is set to - * the root node of the file system being unmounted. - */ - -int file_systems_below_this_mountpoint( - const char *mount_path, - rtems_filesystem_location_info_t *temp_loc, - rtems_filesystem_mount_table_entry_t *temp_mt_entry -) -{ - Chain_Node *the_node; - rtems_filesystem_mount_table_entry_t *the_mount_entry; - rtems_filesystem_mount_table_entry_t *current_fs_mt_entry; - - /* - * Is the mount_path even a valid node name in the existing tree? - */ - - if ( rtems_filesystem_evaluate_path( mount_path, 0x0, temp_loc, TRUE ) ) - return -1; - - /* - * Look for the node defined in temp_loc as a mount point in the - * mount table chain. - */ - - for ( the_node = rtems_filesystem_mount_table_control.first; - !Chain_Is_tail( &rtems_filesystem_mount_table_control, the_node ); - the_node = the_node->next ) { - - the_mount_entry = ( rtems_filesystem_mount_table_entry_t * )the_node; - if (the_mount_entry->mt_point_node.node_access == - temp_loc->node_access ) { - current_fs_mt_entry = the_mount_entry; - *temp_loc = current_fs_mt_entry->mt_fs_root; - goto after_real_mount_point_found; - } - } - set_errno_and_return_minus_one( EACCES ); - - -after_real_mount_point_found: - - for ( the_node = rtems_filesystem_mount_table_control.first; - !Chain_Is_tail( &rtems_filesystem_mount_table_control, the_node ); - the_node = the_node->next ) { - - the_mount_entry = ( rtems_filesystem_mount_table_entry_t * )the_node; - - /* - * Exclude the current file systems mount table entry from the test - */ - - if ( current_fs_mt_entry != the_mount_entry ) { - if ( the_mount_entry->mt_point_node.mt_entry == current_fs_mt_entry ) { - - /* - * There is at least one fs below the fs on the mount_path. - */ - set_errno_and_return_minus_one( EBUSY ); - } - } - } - - *temp_mt_entry = *current_fs_mt_entry; - - return 0; -} |