void zft_reset_position(zft_position *pos)
{
TRACE_FUN(ft_t_flow);
pos->seg_byte_pos =
pos->volume_pos = 0;
if (zft_header_read) {
/* need to keep track of the volume table and
* compression map. We therefor simply
* position at the beginning of the first
* volume. This covers old ftape archives as
* well has various flavours of the
* compression map segments. The worst case is
* that the compression map shows up as a
* additional volume in front of all others.
*/
pos->seg_pos = zft_find_volume(0)->start_seg;
pos->tape_pos = zft_calc_tape_pos(pos->seg_pos);
} else {
pos->tape_pos = 0;
pos->seg_pos = -1;
}
zft_just_before_eof = 0;
zft_deblock_segment = -1;
zft_io_state = zft_idle;
zft_zap_read_buffers();
zft_prevent_flush();
/* unlock the compresison module if it is loaded.
* The zero arg means not to try to load the module.
*/
if (zft_cmpr_lock(0) == 0) {
(*zft_cmpr_ops->reset)(); /* unlock */
}
TRACE_EXIT;
}
int zft_verify_write_segments(unsigned int segment,
__u8 *data, size_t size,
__u8 *buffer)
{
int result;
__u8 *write_buf;
__u8 *src_buf;
int single;
int seg_pos;
int seg_sz;
int remaining;
ft_write_mode_t write_mode;
TRACE_FUN(ft_t_flow);
seg_pos = segment;
seg_sz = zft_get_seg_sz(seg_pos);
src_buf = data;
single = size <= seg_sz;
remaining = size;
do {
TRACE(ft_t_noise, "\n"
KERN_INFO "remaining: %d\n"
KERN_INFO "seg_sz : %d\n"
KERN_INFO "segment : %d",
remaining, seg_sz, seg_pos);
if (remaining == seg_sz) {
write_buf = src_buf;
write_mode = single ? FT_WR_SINGLE : FT_WR_MULTI;
remaining = 0;
} else if (remaining > seg_sz) {
write_buf = src_buf;
write_mode = FT_WR_ASYNC; /* don't start tape */
remaining -= seg_sz;
} else { /* remaining < seg_sz */
write_buf = buffer;
memcpy(write_buf, src_buf, remaining);
memset(&write_buf[remaining],'\0',seg_sz-remaining);
write_mode = single ? FT_WR_SINGLE : FT_WR_MULTI;
remaining = 0;
}
if ((result = ftape_write_segment(seg_pos,
write_buf,
write_mode)) != seg_sz) {
TRACE(ft_t_err, "Error: "
"Couldn't write segment %d", seg_pos);
TRACE_EXIT result < 0 ? result : -EIO; /* bail out */
}
zft_written_segments ++;
seg_sz = zft_get_seg_sz(++seg_pos);
src_buf += result;
} while (remaining > 0);
if (ftape_get_status()->fti_state == writing) {
TRACE_CATCH(ftape_loop_until_writes_done(),);
TRACE_CATCH(ftape_abort_operation(),);
zft_prevent_flush();
}
