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First cut at merging.

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Joel Sherrill
1999-10-08 18:53:20 +00:00
parent 7779ace4bf
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doc/filesystem/mounting.t
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@@ -8,45 +8,61 @@
@chapter Mounting and Unmounting File Systems @chapter Mounting and Unmounting File Systems
? Characteristics of a Mount Point @section Mount Points
? 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. The following is the list of the characteristics of a mount point:
? The task must have read/write/execute permissions to the mount point or the
mount attempt will be rejected. @itemize @bullet
? Only one file system can be mounted to a single mount point.
? The Root of the mountable file system will be referenced by the name of the mount @item The mount point must be a directory. It may have files and other
point after the mount is complete. directories under it. These files and directories will be hidden when the
? Mount table chain file system is mounted.
? Content of the mount table chain entry
@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 struct rtems_filesystem_mount_table_entry_tt
@{ @{
Chain_Node Node; Chain_Node Node;
rtems_filesystem_location_info_t mt_point_node; rtems_filesystem_location_info_t mt_point_node;
rtems_filesystem_location_info_t mt_fs_root; rtems_filesystem_location_info_t mt_fs_root;
int options; int options;
void *fs_info; void *fs_info;
rtems_filesystem_limits_and_options_t pathconf_limits_and_options; rtems_filesystem_limits_and_options_t pathconf_limits_and_options;
/* /*
* When someone adds a mounted filesystem on a real device, * When someone adds a mounted filesystem on a real device,
* this will need to be used. * this will need to be used.
* *
* The best option long term for this is probably an open file descriptor. * The best option long term for this is probably an
* open file descriptor.
*/ */
char *dev; char *dev;
@}; @};
? Adding entries to the chain during mount() @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.
? Removing entries from the chain during unmount() When a file system is mounted, its presence and location in the file
When a file system is dismounted its entry in the mount table chain is extracted system hierarchy is recorded in a dynamic list structure known as a chain.
and the memory for this entry is freed. 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.