Struct fs_ext4_blockdev_cfg_t 

#[repr(C)]
pub struct fs_ext4_blockdev_cfg_t {
    pub read: fs_ext4_read_fn,
    pub context: *mut c_void,
    pub size_bytes: u64,
    pub block_size: u32,
    pub write: fs_ext4_write_fn,
    pub flush: fs_ext4_flush_fn,
}

Callback-based mount config (matches fs_ext4_blockdev_cfg_t).

write / flush were appended in v0.1.3 — fs_ext4_mount_with_callbacks ignores them (still RO), fs_ext4_mount_rw_with_callbacks requires write to be set.

Fields

read: fs_ext4_read_fn

context: *mut c_void

size_bytes: u64

block_size: u32

On the mount entry points: the device’s sector size. When it is greater than 1 the callbacks receive only requests whose offset and length are multiples of it (see [callback_mount_device]); 0 or 1 passes the engine’s byte-granular requests through unchanged. On fs_ext4_mkfs it is the filesystem block size to format with.

write: fs_ext4_write_fn

flush: fs_ext4_flush_fn