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@c
@c COPYRIGHT (c) 1988-1998.
@c On-Line Applications Research Corporation (OAR).
@c All rights reserved.
@c
@c $Id$
@c
@chapter Mounting and Unmounting File Systems
@section Mount Points
The following is the list of the characteristics of a mount point:
@itemize @bullet
@item The mount point must be a directory. It may have files and other
directories under it. These files and directories will be hidden when the
file system is mounted.
@item The task must have read/write/execute permissions to the mount point
or the mount attempt will be rejected.
@item Only one file system can be mounted to a single mount point.
@item The Root of the mountable file system will be referenced by the name
of the mount point after the mount is complete.
@end itemize
@section Mount Table Chain
Each entry in the mount table chain is of the following type:
struct rtems_filesystem_mount_table_entry_tt
@{
Chain_Node Node;
rtems_filesystem_location_info_t mt_point_node;
rtems_filesystem_location_info_t mt_fs_root;
int options;
void *fs_info;
rtems_filesystem_limits_and_options_t pathconf_limits_and_options;
/*
* When someone adds a mounted filesystem on a real device,
* this will need to be used.
*
* The best option long term for this is probably an
* open file descriptor.
*/
char *dev;
@};
@section Adding entries to the chain during mount
When a file system is mounted, its presence and location in the file
system hierarchy is recorded in a dynamic list structure known as a chain.
A unique rtems_filesystem_mount_table_entry_tt structure is logged for
each file system that is mounted. This includes the base file system.
@section Removing entries from the chain during unmount
When a file system is dismounted its entry in the mount table chain is
extracted and the memory for this entry is freed.
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