driver.storage.fs.mgr¶

Filesystem driver registry and volume probing.

Overview¶

The filesystem manager maintains a linked list of registered TFilesystem descriptors. Filesystem drivers (FAT32, FlatFS, ISO 9660, etc.) call register_filesystem during their init procedure to make themselves available. When the volume manager discovers a new partition, it calls probe_volume to determine which filesystem the partition contains.

probe_volume iterates all registered drivers and calls each one's identifyCallback. The first driver that returns true is assigned as the volume's filesystem. If no driver recognises the volume, filesystem remains nil.

Dependencies¶

core.ds.lists
memory.heap
driver.storage.types
core.strings
debug.tracer
core.util, arch.x86.util

Variables¶

Name	Type	Description
`filesystems`	`PLinkedListBase`	Linked list of registered `TFilesystem` records

Functions and Procedures¶

init¶

procedure init();

Allocates the filesystem linked list. Must be called before any filesystem driver registers itself.

register_filesystem¶

procedure register_filesystem(filesystem : PFilesystem);

Copies the TFilesystem descriptor into the linked list. The caller may pass a pointer to a static record; the list stores a value copy.

get_filesystem_count¶

function get_filesystem_count() : uint32;

Returns the number of registered filesystem drivers.

get_filesystem¶

function get_filesystem(index : uint32) : PFilesystem;

Returns the filesystem descriptor at index, or nil if out of range.

find_filesystem_by_name¶

function find_filesystem_by_name(name : pchar) : PFilesystem;

Searches for a filesystem by its sName field. Returns nil if not found.

find_filesystem_by_id¶

function find_filesystem_by_id(system_id : uint8) : PFilesystem;

Searches for a filesystem by its MBR partition type byte. Returns nil if not found.

probe_volume¶

procedure probe_volume(volume : PStorage_Volume);

Iterates all registered filesystems and calls each one's identifyCallback(volume). Assigns volume^.filesystem to the first driver that returns true. If no driver matches, filesystem remains unchanged (typically nil).