fat_alloc_state_t Struct Reference

One mounted volume's answer to "where is the free space". More...

Collaboration diagram for fat_alloc_state_t:

Data Fields
const ra8_fs_mount_t *	owner
	Mount this slot describes; NULL = free.
uint32_t	next_free
	Cluster the next scan starts at.
uint32_t	free_count
	Free clusters, or k_fs_free_unknown.
uint32_t	fsinfo_lba
	FSInfo sector, or k_fs_fsinfo_absent.
uint64_t	bitmap_lba
	exFAT bitmap LBA, or unknown.
uint8_t	dirty
	1 = FSInfo needs a writeback.

Detailed Description

One mounted volume's answer to "where is the free space".

Bound by priv_alloc_state_bind and released by priv_alloc_state_release, so it always describes the volume currently at owner and never a previous tenant of the same mount slot.

Invariant

owner == nullptr exactly when the slot is free.

next_free >= k_cluster_first_data in a bound slot.

fsinfo_lba == k_fs_fsinfo_absent unless the volume carries a fully validated FSInfo sector.

See also

priv_alloc_state_bind()

Since

0.1.0

Definition at line 71 of file ra8_fs_fat_alloc.c.

Field Documentation

bitmap_lba

uint64_t fat_alloc_state_t::bitmap_lba

exFAT bitmap LBA, or unknown.

Definition at line 76 of file ra8_fs_fat_alloc.c.

Referenced by priv_alloc_state_bind(), and priv_exfat_bitmap_lba().

dirty

uint8_t fat_alloc_state_t::dirty

1 = FSInfo needs a writeback.

Definition at line 77 of file ra8_fs_fat_alloc.c.

Referenced by priv_alloc_state_bind(), priv_free_count_gave(), priv_free_count_took(), and priv_fsinfo_flush().

free_count

uint32_t fat_alloc_state_t::free_count

Free clusters, or k_fs_free_unknown.

Definition at line 74 of file ra8_fs_fat_alloc.c.

Referenced by priv_alloc_state_bind(), priv_free_count_cache(), priv_free_count_gave(), priv_free_count_peek(), priv_free_count_took(), priv_fsinfo_flush(), and priv_fsinfo_seed().

fsinfo_lba

uint32_t fat_alloc_state_t::fsinfo_lba

FSInfo sector, or k_fs_fsinfo_absent.

Definition at line 75 of file ra8_fs_fat_alloc.c.

Referenced by priv_alloc_state_bind(), priv_fsinfo_flush(), and priv_fsinfo_seed().

next_free

uint32_t fat_alloc_state_t::next_free

Cluster the next scan starts at.

Definition at line 73 of file ra8_fs_fat_alloc.c.

Referenced by priv_alloc_hint_get(), priv_alloc_hint_lower(), priv_alloc_hint_set(), priv_alloc_state_bind(), priv_fsinfo_flush(), and priv_fsinfo_seed().

owner

const ra8_fs_mount_t* fat_alloc_state_t::owner

Mount this slot describes; NULL = free.

Definition at line 72 of file ra8_fs_fat_alloc.c.

Referenced by priv_alloc_state_bind().

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

• libs/ra8_fs/src/ra8_fs_fat_alloc.c