Cached parse of one mounted FAT volume. More...

#include <ra8_fs_types.h>

Collaboration diagram for ra8_fs_mount_t:

Data Fields
ra8_fs_backend_t	backend
	Block-device backend.
ra8_fs_type_t	type
	FAT12 / FAT16 / FAT32.
uint32_t	bytes_per_sector
	Sector size (BPB / VBR == backend).
uint32_t	sectors_per_cluster
	BPB BPB_SecPerClus.
uint32_t	reserved_sectors
	BPB BPB_RsvdSecCnt.
uint32_t	num_fats
	BPB BPB_NumFATs.
uint32_t	root_entries
	BPB BPB_RootEntCnt (FAT12/16).
uint64_t	total_sectors
	BPB TotSec / exFAT VolumeLength.
uint32_t	fat_size_sectors
	BPB BPB_FATSz16 / BPB_FATSz32.
uint32_t	root_cluster
	BPB BPB_RootClus (FAT32 only).
uint64_t	first_fat_lba
	Computed: first FAT sector.
uint64_t	first_root_lba
	FAT12/16 fixed root-dir start.
uint64_t	first_data_lba
	First sector of the data region.
uint32_t	count_of_clusters
	Per MS spec: data_sectors / SPC.
uint64_t	partition_base_lba
	MBR/GPT partition start (0 = superfloppy).
uint8_t	in_use
	0 = slot free, 1 = mounted.
uint8_t	exfat_upcase_ok
	exFAT: volume's up-case table is ours.

Detailed Description

Cached parse of one mounted FAT volume.

Populated by ra8_fs_mount() from the on-disk BPB. The struct is intentionally exposed so callers can statically allocate it; treat the fields as read-only.

Definition at line 244 of file ra8_fs_types.h.

Field Documentation

◆ backend

ra8_fs_backend_t ra8_fs_mount_t::backend

Block-device backend.

Definition at line 245 of file ra8_fs_types.h.

Referenced by internal_probe_locked(), priv_read_sector(), and priv_write_sector().

◆ bytes_per_sector

uint32_t ra8_fs_mount_t::bytes_per_sector

Sector size (BPB / VBR == backend).

Definition at line 247 of file ra8_fs_types.h.

Referenced by internal_exfat_parse(), internal_mount_probe_bps(), priv_bps(), priv_cluster_bytes(), priv_dir_eps(), and priv_parse_bpb_into_mount().

◆ count_of_clusters

uint32_t ra8_fs_mount_t::count_of_clusters

Per MS spec: data_sectors / SPC.

Definition at line 258 of file ra8_fs_types.h.

Referenced by internal_alloc_start(), internal_compute_geometry(), internal_exfat_bitmap_window(), internal_exfat_dir_survey(), internal_exfat_parse(), internal_exfat_pick_cluster(), internal_exfat_survey_alloc(), internal_space_exfat_free(), internal_space_fat_free(), priv_alloc_cluster(), priv_dir_walk_next_sector(), priv_exfat_bitmap_scan(), priv_exfat_free_clusters(), priv_free_chain(), priv_free_count_cache(), priv_free_count_gave(), and priv_fsinfo_seed().

◆ exfat_upcase_ok

uint8_t ra8_fs_mount_t::exfat_upcase_ok

exFAT: volume's up-case table is ours.

Definition at line 261 of file ra8_fs_types.h.

Referenced by priv_exfat_name_to_units(), and priv_exfat_upcase_verify().

◆ fat_size_sectors

uint32_t ra8_fs_mount_t::fat_size_sectors

BPB BPB_FATSz16 / BPB_FATSz32.

Definition at line 253 of file ra8_fs_types.h.

Referenced by internal_compute_geometry(), internal_exfat_parse(), internal_lba_is_cacheable(), priv_fat_set(), and priv_parse_bpb_into_mount().

◆ first_data_lba

uint64_t ra8_fs_mount_t::first_data_lba

First sector of the data region.

Definition at line 257 of file ra8_fs_types.h.

Referenced by internal_compute_geometry(), internal_exfat_parse(), and priv_cluster_to_lba().

◆ first_fat_lba

uint64_t ra8_fs_mount_t::first_fat_lba

Computed: first FAT sector.

Definition at line 255 of file ra8_fs_types.h.

Referenced by internal_compute_geometry(), internal_exfat_parse(), internal_lba_is_cacheable(), priv_fat_get(), and priv_fat_set().

◆ first_root_lba

uint64_t ra8_fs_mount_t::first_root_lba

FAT12/16 fixed root-dir start.

Definition at line 256 of file ra8_fs_types.h.

Referenced by internal_compute_geometry(), internal_dir_walk_init_root(), internal_exfat_parse(), and internal_fat_scan_fixed_root().

◆ in_use

uint8_t ra8_fs_mount_t::in_use

0 = slot free, 1 = mounted.

Definition at line 260 of file ra8_fs_types.h.

Referenced by fw_fs_ra8_vfs_init(), and priv_open_locked().

◆ num_fats

uint32_t ra8_fs_mount_t::num_fats

BPB BPB_NumFATs.

Definition at line 250 of file ra8_fs_types.h.

Referenced by internal_compute_geometry(), internal_exfat_parse(), priv_fat_set(), and priv_parse_bpb_into_mount().

◆ partition_base_lba

uint64_t ra8_fs_mount_t::partition_base_lba

MBR/GPT partition start (0 = superfloppy).

Definition at line 259 of file ra8_fs_types.h.

Referenced by internal_read_boot_sector(), priv_read_sector(), and priv_write_sector().

◆ reserved_sectors

uint32_t ra8_fs_mount_t::reserved_sectors

BPB BPB_RsvdSecCnt.

Definition at line 249 of file ra8_fs_types.h.

Referenced by internal_compute_geometry(), internal_exfat_parse(), internal_fat_fsinfo(), internal_fsinfo_locate(), and priv_parse_bpb_into_mount().

◆ root_cluster

uint32_t ra8_fs_mount_t::root_cluster

BPB BPB_RootClus (FAT32 only).

Definition at line 254 of file ra8_fs_types.h.

Referenced by internal_dir_walk_init_root(), internal_exfat_parse(), internal_fat_tree(), internal_stat_root(), priv_exfat_dir_root(), priv_exfat_upcase_verify(), and priv_parse_bpb_into_mount().

◆ root_entries

uint32_t ra8_fs_mount_t::root_entries

BPB BPB_RootEntCnt (FAT12/16).

Definition at line 251 of file ra8_fs_types.h.

Referenced by internal_compute_geometry(), internal_dir_walk_init_root(), internal_exfat_parse(), internal_fat_scan_fixed_root(), and priv_parse_bpb_into_mount().

◆ sectors_per_cluster

uint32_t ra8_fs_mount_t::sectors_per_cluster

BPB BPB_SecPerClus.

Definition at line 248 of file ra8_fs_types.h.

Referenced by internal_compute_geometry(), internal_dir_cluster_init(), internal_dir_grow(), internal_exfat_parse(), internal_fat_scan_cluster_dir(), priv_cluster_bytes(), priv_cluster_to_lba(), priv_dir_walk_next_sector(), priv_exfat_seal_cluster(), priv_exfat_zero_cluster(), and priv_parse_bpb_into_mount().

◆ total_sectors

uint64_t ra8_fs_mount_t::total_sectors

BPB TotSec / exFAT VolumeLength.

Definition at line 252 of file ra8_fs_types.h.

Referenced by internal_compute_geometry(), internal_exfat_parse(), and priv_parse_bpb_into_mount().

◆ type

ra8_fs_type_t ra8_fs_mount_t::type

The documentation for this struct was generated from the following file:

libs/ra8_fs/inc/ra8_fs_types.h

Data Fields