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Diffstat (limited to '')
| -rw-r--r-- | c/src/exec/libcsupport/src/unmount.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/c/src/exec/libcsupport/src/unmount.c b/c/src/exec/libcsupport/src/unmount.c deleted file mode 100644 index 9c2653378b..0000000000 --- a/c/src/exec/libcsupport/src/unmount.c +++ /dev/null @@ -1,221 +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. - * - * $Id$ - */ - -#if HAVE_CONFIG_H -#include "config.h" -#endif - -#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 <rtems/libio_.h> -#include <rtems/seterr.h> - -/* - * Data structures and routines private to mount/unmount pair. - */ - -extern Chain_Control rtems_filesystem_mount_table_control; - -int search_mt_for_mount_point( - rtems_filesystem_location_info_t *location_of_mount_point -); - -rtems_boolean rtems_filesystem_nodes_equal( - const rtems_filesystem_location_info_t *loc1, - const rtems_filesystem_location_info_t *loc2 -){ - return ( loc1->node_access == loc2->node_access ); -} - - -/* - * 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. - */ - -rtems_boolean file_systems_below_this_mountpoint( - const char *path, - rtems_filesystem_location_info_t *fs_root_loc, - rtems_filesystem_mount_table_entry_t *fs_to_unmount -) -{ - Chain_Node *the_node; - rtems_filesystem_mount_table_entry_t *the_mount_entry; - - /* - * Search the mount table for any mount entries referencing this - * mount entry. - */ - - 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.mt_entry == fs_root_loc->mt_entry ) { - return TRUE; - } - } - - return FALSE; -} - -/* - * unmount - * - * This routine will attempt to unmount the file system that has been - * is mounted a path. If the operation is successful, 0 will - * be returned to the calling routine. Otherwise, 1 will be returned. - */ - -int unmount( - const char *path -) -{ - rtems_filesystem_location_info_t loc; - rtems_filesystem_location_info_t *fs_root_loc; - rtems_filesystem_location_info_t *fs_mount_loc; - rtems_filesystem_mount_table_entry_t *mt_entry; - - /* - * Get - * The root node of the mounted filesytem. - * The node for the directory that the fileystem is mounted on. - * The mount entry that is being refered to. - */ - - if ( rtems_filesystem_evaluate_path( path, 0x0, &loc, TRUE ) ) - return -1; - - mt_entry = loc.mt_entry; - fs_mount_loc = &mt_entry->mt_point_node; - fs_root_loc = &mt_entry->mt_fs_root; - - /* - * Verify this is the root node for the file system to be unmounted. - */ - - if ( !rtems_filesystem_nodes_equal( fs_root_loc, &loc) ){ - rtems_filesystem_freenode( &loc ); - rtems_set_errno_and_return_minus_one( EACCES ); - } - - /* - * Free the loc node and just use the nodes from the mt_entry . - */ - - rtems_filesystem_freenode( &loc ); - - /* - * Verify Unmount is supported by both filesystems. - */ - - if ( !fs_mount_loc->ops->unmount_h ) - rtems_set_errno_and_return_minus_one( ENOTSUP ); - - if ( !fs_root_loc->ops->fsunmount_me_h ) - rtems_set_errno_and_return_minus_one( ENOTSUP ); - - - /* - * Verify the current node is not in this filesystem. - * XXX - Joel I have a question here wasn't code added - * that made the current node thread based instead - * of system based? I thought it was but it doesn't - * look like it in this version. - */ - - if ( rtems_filesystem_current.mt_entry == mt_entry ) - rtems_set_errno_and_return_minus_one( EBUSY ); - - /* - * Verify there are no file systems below the path specified - */ - - if ( file_systems_below_this_mountpoint( path, fs_root_loc, mt_entry ) != 0 ) - rtems_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( mt_entry ) == 1 ) - rtems_set_errno_and_return_minus_one( EBUSY ); - - /* - * Allow the file system being unmounted on to do its cleanup. - * If it fails it will set the errno to the approprate value - * and the fileystem will not be modified. - */ - - if (( fs_mount_loc->ops->unmount_h )( mt_entry ) != 0 ) - return -1; - - /* - * Allow the mounted filesystem to unmark the use of the root node. - * - * Run the unmount function for the subordinate file system. - * - * If we fail to unmount the filesystem remount it on the base filesystems - * directory node. - * - * NOTE: Fatal error is called in a case which should never happen - * This was response was questionable but the best we could - * come up with. - */ - - if ((fs_root_loc->ops->fsunmount_me_h )( mt_entry ) != 0){ - if (( fs_mount_loc->ops->mount_h )( mt_entry ) != 0 ) - rtems_fatal_error_occurred( 0 ); - return -1; - } - - /* - * Extract the mount table entry from the chain - */ - - Chain_Extract( ( Chain_Node * ) mt_entry ); - - /* - * Free the memory node that was allocated in mount - * Free the memory associated with the extracted mount table entry. - */ - - rtems_filesystem_freenode( fs_mount_loc ); - free( mt_entry ); - - return 0; -} - - |