int
ndmta_write_quantum (struct ndm_session *sess)
{
struct ndm_tape_agent * ta = sess->tape_acb;
struct ndmchan * ch = &sess->plumb.image_stream->chan;
uint32_t count = ta->mover_state.record_size;
int did_something = 0;
uint64_t max_read;
uint64_t want_window_off;
uint32_t block_size;
uint32_t want_blockno;
uint32_t cur_blockno;
unsigned n_avail, n_read, record_off;
char * data;
uint32_t done_count = 0;
ndmp9_error error;
again:
n_read = n_avail = ndmchan_n_avail_record (ch, count);
if (n_avail < count) {
/* allow to drain */
return did_something;
}
if (ta->pending_change_after_drain) {
if (ndmchan_n_ready (ch) > 0) {
/* allow to drain */
} else {
ndmta_mover_apply_pending (sess);
did_something++;
}
return did_something;
}
if (n_read > ta->mover_state.bytes_left_to_read)
n_read = ta->mover_state.bytes_left_to_read;
if (n_read < count) {
/* Active, but paused awaiting MOVER_READ request */
return did_something; /* mover blocked */
}
if (ta->mover_want_pos < ta->mover_state.window_offset
|| ta->mover_want_pos >= ta->mover_window_end) {
ndmta_mover_pause_pending (sess, NDMP9_MOVER_PAUSE_SEEK);
goto again;
}
max_read = ta->mover_window_end - ta->mover_want_pos;
if (n_read > max_read)
n_read = max_read;
want_window_off = ta->mover_want_pos - ta->mover_state.window_offset;
/* make an estimate of the block size - the tape agent's block size, or
* if it's in variable block size mode, the mover's record size: "When
* in variable block mode, as indicated by a tape block_size value of
* zero, the mover record size defines the actual block size used by
* the tape subsystem." (NDMPv4 RFC, Section 3.6.2.1) */
block_size = ta->tape_state.block_size.value;
if (!block_size)
block_size = ta->mover_state.record_size;
want_blockno = ta->mover_window_first_blockno + want_window_off / block_size;
if (ta->tb_blockno != want_blockno) {
uint32_t xsr_count, xsr_resid;
ndmos_tape_sync_state(sess);
cur_blockno = ta->tape_state.blockno.value;
if (cur_blockno < want_blockno) {
xsr_count = want_blockno - cur_blockno;
error = ndmos_tape_mtio (sess, NDMP9_MTIO_FSR,
xsr_count, &xsr_resid);
if (error == NDMP9_EOF_ERR) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_EOF);
goto again;
}
if (error != NDMP9_NO_ERR) {
ndmta_mover_halt_pending (sess,
NDMP9_MOVER_HALT_MEDIA_ERROR);
goto again;
}
if (xsr_resid > 0) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_EOF);
goto again;
}
} else if (cur_blockno > want_blockno) {
xsr_count = cur_blockno - want_blockno;
error = ndmos_tape_mtio (sess, NDMP9_MTIO_BSR,
xsr_count, &xsr_resid);
if (error != NDMP9_NO_ERR || xsr_resid > 0) {
ndmta_mover_halt_pending (sess,
NDMP9_MOVER_HALT_MEDIA_ERROR);
goto again;
}
} else {
/* in position */
}
/*
* We are about to read data into a tape buffer so make sure
* we have it available. We delay allocating buffers to the
* moment we first need them.
*/
if (!ta->tape_buffer) {
ta->tape_buffer = NDMOS_API_MALLOC (NDMOS_CONST_TAPE_REC_MAX);
if (!ta->tape_buffer) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_HALT_NA);
goto again;
}
}
data = ta->tape_buffer;
done_count = 0;
error = ndmos_tape_read (sess, data, count, &done_count);
did_something++;
if (error == NDMP9_EOF_ERR) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_EOF);
goto again;
}
/* N.B. - handling of done_count = 0 here is hacked to support
* non-blocking writes to a socket in amndmjob */
if (error != NDMP9_NO_ERR) {
ndmta_mover_halt_pending (sess,
NDMP9_MOVER_HALT_MEDIA_ERROR);
goto again;
}
if (done_count == 0) {
return did_something - 1;
}
if (done_count != count) {
goto again;
}
ta->tb_blockno = want_blockno;
/* re-calcluate this, since record_size may be > block_size, in which
* case the record_num may not change for each block read from tape */
ta->mover_state.record_num = ta->mover_want_pos / ta->mover_state.record_size;
}
record_off = ta->mover_want_pos % ta->mover_state.record_size;
n_avail = ta->mover_state.record_size - record_off;
if (n_read > n_avail)
n_read = n_avail;
if (n_read != done_count) {
printf("lost %lu bytes %lu %u\n", done_count - n_read, done_count, n_read);
n_read = done_count;
}
/*
* We are about to read data into a tape buffer so make sure
* we have it available. We delay allocating buffers to the
* moment we first need them.
*/
if (!ta->tape_buffer) {
ta->tape_buffer = NDMOS_API_MALLOC (NDMOS_CONST_TAPE_REC_MAX);
if (!ta->tape_buffer) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_HALT_NA);
goto again;
}
}
data = &ta->tape_buffer[record_off];
bcopy (data, ch->data + ch->end_ix, n_read);
ch->end_ix += n_read;
ta->mover_state.bytes_moved += n_read;
ta->mover_want_pos += n_read;
ta->mover_state.bytes_left_to_read -= n_read;
did_something++;
goto again; /* do as much as possible */
}
int
ndmta_write_quantum (struct ndm_session *sess)
{
struct ndm_tape_agent * ta = &sess->tape_acb;
struct ndmchan * ch = &sess->plumb.image_stream.chan;
unsigned long count = ta->mover_state.record_size;
int did_something = 0;
unsigned long long max_read;
unsigned long long want_window_off;
unsigned long want_blockno;
unsigned long cur_blockno;
unsigned n_avail, n_read, record_off;
char * data;
unsigned long done_count;
ndmp9_error error;
again:
n_read = n_avail = ndmchan_n_avail (ch);
if (n_avail == 0) {
/* allow to drain */
return did_something;
}
if (ta->pending_change_after_drain) {
if (ndmchan_n_ready (ch) > 0) {
/* allow to drain */
} else {
ndmta_mover_apply_pending (sess);
did_something++;
}
return did_something;
}
if (n_read > ta->mover_state.bytes_left_to_read)
n_read = ta->mover_state.bytes_left_to_read;
if (n_read == 0) {
/* Active, but paused awaiting MOVER_READ request */
return did_something; /* mover blocked */
}
if (ta->mover_want_pos < ta->mover_state.window_offset
|| ta->mover_want_pos >= ta->mover_window_end) {
ndmta_mover_pause_pending (sess, NDMP9_MOVER_PAUSE_SEEK);
goto again;
}
max_read = ta->mover_window_end - ta->mover_want_pos;
if (n_read > max_read)
n_read = max_read;
want_window_off = ta->mover_want_pos - ta->mover_state.window_offset;
want_blockno = want_window_off / ta->mover_state.record_size;
if (ta->tb_blockno != want_blockno) {
unsigned long xsr_count, xsr_resid;
ndmos_tape_sync_state(sess);
cur_blockno = ta->tape_state.blockno.value;
if (cur_blockno < want_blockno) {
xsr_count = want_blockno - cur_blockno;
error = ndmos_tape_mtio (sess, NDMP9_MTIO_FSR,
xsr_count, &xsr_resid);
if (error == NDMP9_EOF_ERR) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_EOF);
goto again;
}
if (error != NDMP9_NO_ERR) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_MEDIA_ERROR);
goto again;
}
if (xsr_resid > 0) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_EOF);
goto again;
}
} else if (cur_blockno > want_blockno) {
xsr_count = cur_blockno - want_blockno;
error = ndmos_tape_mtio (sess, NDMP9_MTIO_BSR,
xsr_count, &xsr_resid);
if (error != NDMP9_NO_ERR || xsr_resid > 0) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_MEDIA_ERROR);
goto again;
}
} else {
/* in position */
}
data = ta->tape_buffer;
done_count = 0;
error = ndmos_tape_read (sess, data, count, &done_count);
did_something++;
if (error == NDMP9_EOF_ERR) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_EOF);
goto again;
}
if (error != NDMP9_NO_ERR) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_MEDIA_ERROR);
goto again;
}
if (done_count == 0) {
return did_something - 1;
}
if (done_count != count) {
n_read = done_count;
goto aaa;
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_MEDIA_ERROR);
goto again;
}
ta->tb_blockno = want_blockno;
}
aaa:
record_off = ta->mover_want_pos % ta->mover_state.record_size;
n_avail = ta->mover_state.record_size - record_off;
if (n_read > n_avail)
n_read = n_avail;
data = &ta->tape_buffer[record_off];
bcopy (data, ch->data + ch->end_ix, n_read);
ch->end_ix += n_read;
ta->mover_want_pos += n_read;
ta->mover_state.bytes_left_to_read -= n_read;
did_something++;
goto again; /* do as much as possible */
}
int
ndmta_write_quantum (struct ndm_session *sess)
{
struct ndm_tape_agent * ta = &sess->tape_acb;
struct ndmchan * ch = &sess->plumb.image_stream.chan;
unsigned long count = ta->mover_state.record_size;
int did_something = 0;
unsigned long long max_read;
unsigned long long want_window_off;
unsigned long block_size;
unsigned long want_blockno;
unsigned long cur_blockno;
unsigned n_avail, n_read, record_off;
char * data;
unsigned long done_count;
ndmp9_error error;
again:
n_read = n_avail = ndmchan_n_avail (ch);
if (n_avail == 0) {
/* allow to drain */
return did_something;
}
if (ta->pending_change_after_drain) {
if (ndmchan_n_ready (ch) > 0) {
/* allow to drain */
} else {
ndmta_mover_apply_pending (sess);
did_something++;
}
return did_something;
}
if (n_read > ta->mover_state.bytes_left_to_read)
n_read = ta->mover_state.bytes_left_to_read;
if (n_read == 0) {
/* Active, but paused awaiting MOVER_READ request */
return did_something; /* mover blocked */
}
if (ta->mover_want_pos < ta->mover_state.window_offset
|| ta->mover_want_pos >= ta->mover_window_end) {
ndmta_mover_pause_pending (sess, NDMP9_MOVER_PAUSE_SEEK);
goto again;
}
max_read = ta->mover_window_end - ta->mover_want_pos;
if (n_read > max_read)
n_read = max_read;
want_window_off = ta->mover_want_pos - ta->mover_state.window_offset;
/* make an estimate of the block size - the tape agent's block size, or
* if it's in variable block size mode, the mover's record size: "When
* in variable block mode, as indicated by a tape block_size value of
* zero, the mover record size defines the actual block size used by
* the tape subsystem." (NDMPv4 RFC, Section 3.6.2.1) */
block_size = ta->tape_state.block_size.value;
if (!block_size)
block_size = ta->mover_state.record_size;
want_blockno = ta->mover_window_first_blockno + want_window_off / block_size;
if (ta->tb_blockno != want_blockno) {
unsigned long xsr_count, xsr_resid;
ndmos_tape_sync_state(sess);
cur_blockno = ta->tape_state.blockno.value;
if (cur_blockno < want_blockno) {
xsr_count = want_blockno - cur_blockno;
error = ndmos_tape_mtio (sess, NDMP9_MTIO_FSR,
xsr_count, &xsr_resid);
if (error == NDMP9_EOF_ERR) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_EOF);
goto again;
}
if (error != NDMP9_NO_ERR) {
ndmta_mover_halt_pending (sess,
NDMP9_MOVER_HALT_MEDIA_ERROR);
goto again;
}
if (xsr_resid > 0) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_EOF);
goto again;
}
} else if (cur_blockno > want_blockno) {
xsr_count = cur_blockno - want_blockno;
error = ndmos_tape_mtio (sess, NDMP9_MTIO_BSR,
xsr_count, &xsr_resid);
if (error != NDMP9_NO_ERR || xsr_resid > 0) {
ndmta_mover_halt_pending (sess,
NDMP9_MOVER_HALT_MEDIA_ERROR);
goto again;
}
} else {
/* in position */
}
data = ta->tape_buffer;
done_count = 0;
error = ndmos_tape_read (sess, data, count, &done_count);
did_something++;
if (error == NDMP9_EOF_ERR) {
ndmta_mover_pause_pending (sess,
NDMP9_MOVER_PAUSE_EOF);
goto again;
}
if (error != NDMP9_NO_ERR || done_count != count) {
ndmta_mover_halt_pending (sess,
NDMP9_MOVER_HALT_MEDIA_ERROR);
goto again;
}
ta->tb_blockno = want_blockno;
/* re-calcluate this, since record_size may be > block_size, in which
* case the record_num may not change for each block read from tape */
ta->mover_state.record_num = ta->mover_want_pos / ta->mover_state.record_size;
}
record_off = ta->mover_want_pos % ta->mover_state.record_size;
n_avail = ta->mover_state.record_size - record_off;
if (n_read > n_avail)
n_read = n_avail;
data = &ta->tape_buffer[record_off];
bcopy (data, ch->data + ch->end_ix, n_read);
ch->end_ix += n_read;
ta->mover_state.bytes_moved += n_read;
ta->mover_want_pos += n_read;
ta->mover_state.bytes_left_to_read -= n_read;
did_something++;
goto again; /* do as much as possible */
}