write_walk_t Struct Reference

Forward waypoint carried across one write's grow-walks. More...

Data Fields
uint32_t	cluster
	Cluster the last walk reached.
uint32_t	index
	Chain index of cluster.

Detailed Description

Forward waypoint carried across one write's grow-walks.

Without it every sector of a long write re-walked the chain from the head, which is O(K^2) FAT lookups over a K-cluster file – the same quadratic as the allocation scan and worth the same fix (#607). One write's offset only ever moves forward, so the waypoint is always at or behind the cluster being written.

Invariant

index is the chain index of cluster.

See also

priv_write_position()

Since

0.1.0

Definition at line 370 of file ra8_fs_fat_fileio.c.

Field Documentation

cluster

uint32_t write_walk_t::cluster

Cluster the last walk reached.

Definition at line 371 of file ra8_fs_fat_fileio.c.

Referenced by internal_write_position().

index

uint32_t write_walk_t::index

Chain index of cluster.

Definition at line 372 of file ra8_fs_fat_fileio.c.

Referenced by internal_write_position().

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

• libs/ra8_fs/src/ra8_fs_fat_fileio.c