#endif
/**************************** Tunable parameters *****************************/
-
-
-/*
- * Pipelined mode parameters.
- *
- * We try to use the minimum number of stages which is enough to keep the tape
- * constantly streaming. To accomplish that, we implement a feedback loop around
- * the maximum number of stages:
- *
- * We start from MIN maximum stages (we will not even use MIN stages if we don't
- * need them), increment it by RATE*(MAX-MIN) whenever we sense that the
- * pipeline is empty, until we reach the optimum value or until we reach MAX.
- *
- * Setting the following parameter to 0 is illegal: the pipelined mode cannot be
- * disabled (idetape_calculate_speeds() divides by tape->max_stages.)
- */
-#define IDETAPE_MIN_PIPELINE_STAGES 1
-#define IDETAPE_MAX_PIPELINE_STAGES 400
-#define IDETAPE_INCREASE_STAGES_RATE 20
-
/*
* After each failed packet command we issue a request sense command and retry
* the packet command IDETAPE_MAX_PC_RETRIES times.
/* 0 When the tape position is unknown */
IDETAPE_FLAG_ADDRESS_VALID = (1 << 1),
/* Device already opened */
- IDETAPE_FLAG_BUSY = (1 << 2),
- /* Error detected in a pipeline stage */
- IDETAPE_FLAG_PIPELINE_ERR = (1 << 3),
+ IDETAPE_FLAG_BUSY = (1 << 2),
/* Attempt to auto-detect the current user block size */
- IDETAPE_FLAG_DETECT_BS = (1 << 4),
+ IDETAPE_FLAG_DETECT_BS = (1 << 3),
/* Currently on a filemark */
- IDETAPE_FLAG_FILEMARK = (1 << 5),
+ IDETAPE_FLAG_FILEMARK = (1 << 4),
/* DRQ interrupt device */
- IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 6),
- /* pipeline active */
- IDETAPE_FLAG_PIPELINE_ACTIVE = (1 << 7),
+ IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 5),
/* 0 = no tape is loaded, so we don't rewind after ejecting */
- IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 8),
+ IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 6),
};
-/* A pipeline stage. */
-typedef struct idetape_stage_s {
- struct request rq; /* The corresponding request */
- struct idetape_bh *bh; /* The data buffers */
- struct idetape_stage_s *next; /* Pointer to the next stage */
-} idetape_stage_t;
-
/*
* Most of our global data which we need to save even as we leave the driver due
* to an interrupt or a timer event is stored in the struct defined below.
* While polling for DSC we use postponed_rq to postpone the current
* request so that ide.c will be able to service pending requests on the
* other device. Note that at most we will have only one DSC (usually
- * data transfer) request in the device request queue. Additional
- * requests can be queued in our internal pipeline, but they will be
- * visible to ide.c only one at a time.
+ * data transfer) request in the device request queue.
*/
struct request *postponed_rq;
/* The time in which we started polling for DSC */
* At most, there is only one ide-tape originated data transfer request
* in the device request queue. This allows ide.c to easily service
* requests from the other device when we postpone our active request.
- * In the pipelined operation mode, we use our internal pipeline
- * structure to hold more data requests. The data buffer size is chosen
- * based on the tape's recommendation.
*/
- /* ptr to the request which is waiting in the device request queue */
- struct request *active_data_rq;
+
/* Data buffer size chosen based on the tape's recommendation */
- int stage_size;
- idetape_stage_t *merge_stage;
- int merge_stage_size;
+ int buffer_size;
+ /* merge buffer */
+ struct idetape_bh *merge_bh;
+ /* size of the merge buffer */
+ int merge_bh_size;
+ /* pointer to current buffer head within the merge buffer */
struct idetape_bh *bh;
char *b_data;
int b_count;
- /*
- * Pipeline parameters.
- *
- * To accomplish non-pipelined mode, we simply set the following
- * variables to zero (or NULL, where appropriate).
- */
- /* Number of currently used stages */
- int nr_stages;
- /* Number of pending stages */
- int nr_pending_stages;
- /* We will not allocate more than this number of stages */
- int max_stages, min_pipeline, max_pipeline;
- /* The first stage which will be removed from the pipeline */
- idetape_stage_t *first_stage;
- /* The currently active stage */
- idetape_stage_t *active_stage;
- /* Will be serviced after the currently active request */
- idetape_stage_t *next_stage;
- /* New requests will be added to the pipeline here */
- idetape_stage_t *last_stage;
- int pages_per_stage;
+ int pages_per_buffer;
/* Wasted space in each stage */
int excess_bh_size;
/* the tape is write protected (hardware or opened as read-only) */
char write_prot;
- /*
- * Limit the number of times a request can be postponed, to avoid an
- * infinite postpone deadlock.
- */
- int postpone_cnt;
-
- /*
- * Measures number of frames:
- *
- * 1. written/read to/from the driver pipeline (pipeline_head).
- * 2. written/read to/from the tape buffers (idetape_bh).
- * 3. written/read by the tape to/from the media (tape_head).
- */
- int pipeline_head;
- int buffer_head;
- int tape_head;
- int last_tape_head;
-
- /* Speed control at the tape buffers input/output */
- unsigned long insert_time;
- int insert_size;
- int insert_speed;
- int max_insert_speed;
- int measure_insert_time;
-
- /* Speed regulation negative feedback loop */
- int speed_control;
- int pipeline_head_speed;
- int controlled_pipeline_head_speed;
- int uncontrolled_pipeline_head_speed;
- int controlled_last_pipeline_head;
- unsigned long uncontrolled_pipeline_head_time;
- unsigned long controlled_pipeline_head_time;
- int controlled_previous_pipeline_head;
- int uncontrolled_previous_pipeline_head;
- unsigned long controlled_previous_head_time;
- unsigned long uncontrolled_previous_head_time;
- int restart_speed_control_req;
-
u32 debug_mask;
} idetape_tape_t;
if (bh == NULL) {
printk(KERN_ERR "ide-tape: bh == NULL in "
"idetape_input_buffers\n");
- ide_atapi_discard_data(drive, bcount);
+ ide_pad_transfer(drive, 0, bcount);
return;
}
count = min(
(unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
bcount);
- HWIF(drive)->atapi_input_bytes(drive, bh->b_data +
+ drive->hwif->input_data(drive, NULL, bh->b_data +
atomic_read(&bh->b_count), count);
bcount -= count;
atomic_add(count, &bh->b_count);
return;
}
count = min((unsigned int)pc->b_count, (unsigned int)bcount);
- HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
+ drive->hwif->output_data(drive, NULL, pc->b_data, count);
bcount -= count;
pc->b_data += count;
pc->b_count -= count;
if (pc->flags & PC_FLAG_DMA_ERROR) {
pc->xferred = pc->req_xfer -
tape->blk_size *
- be32_to_cpu(get_unaligned((u32 *)&sense[3]));
+ get_unaligned_be32(&sense[3]);
idetape_update_buffers(pc);
}
}
}
-static void idetape_activate_next_stage(ide_drive_t *drive)
+/* Free data buffers completely. */
+static void ide_tape_kfree_buffer(idetape_tape_t *tape)
{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage = tape->next_stage;
- struct request *rq = &stage->rq;
+ struct idetape_bh *prev_bh, *bh = tape->merge_bh;
- debug_log(DBG_PROCS, "Enter %s\n", __func__);
+ while (bh) {
+ u32 size = bh->b_size;
- if (stage == NULL) {
- printk(KERN_ERR "ide-tape: bug: Trying to activate a non"
- " existing stage\n");
- return;
- }
+ while (size) {
+ unsigned int order = fls(size >> PAGE_SHIFT)-1;
- rq->rq_disk = tape->disk;
- rq->buffer = NULL;
- rq->special = (void *)stage->bh;
- tape->active_data_rq = rq;
- tape->active_stage = stage;
- tape->next_stage = stage->next;
-}
-
-/* Free a stage along with its related buffers completely. */
-static void __idetape_kfree_stage(idetape_stage_t *stage)
-{
- struct idetape_bh *prev_bh, *bh = stage->bh;
- int size;
-
- while (bh != NULL) {
- if (bh->b_data != NULL) {
- size = (int) bh->b_size;
- while (size > 0) {
- free_page((unsigned long) bh->b_data);
- size -= PAGE_SIZE;
- bh->b_data += PAGE_SIZE;
- }
+ if (bh->b_data)
+ free_pages((unsigned long)bh->b_data, order);
+
+ size &= (order-1);
+ bh->b_data += (1 << order) * PAGE_SIZE;
}
prev_bh = bh;
bh = bh->b_reqnext;
kfree(prev_bh);
}
- kfree(stage);
-}
-
-static void idetape_kfree_stage(idetape_tape_t *tape, idetape_stage_t *stage)
-{
- __idetape_kfree_stage(stage);
-}
-
-/*
- * Remove tape->first_stage from the pipeline. The caller should avoid race
- * conditions.
- */
-static void idetape_remove_stage_head(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage;
-
- debug_log(DBG_PROCS, "Enter %s\n", __func__);
-
- if (tape->first_stage == NULL) {
- printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
- return;
- }
- if (tape->active_stage == tape->first_stage) {
- printk(KERN_ERR "ide-tape: bug: Trying to free our active "
- "pipeline stage\n");
- return;
- }
- stage = tape->first_stage;
- tape->first_stage = stage->next;
- idetape_kfree_stage(tape, stage);
- tape->nr_stages--;
- if (tape->first_stage == NULL) {
- tape->last_stage = NULL;
- if (tape->next_stage != NULL)
- printk(KERN_ERR "ide-tape: bug: tape->next_stage !="
- " NULL\n");
- if (tape->nr_stages)
- printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 "
- "now\n");
- }
-}
-
-/*
- * This will free all the pipeline stages starting from new_last_stage->next
- * to the end of the list, and point tape->last_stage to new_last_stage.
- */
-static void idetape_abort_pipeline(ide_drive_t *drive,
- idetape_stage_t *new_last_stage)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage = new_last_stage->next;
- idetape_stage_t *nstage;
-
- debug_log(DBG_PROCS, "%s: Enter %s\n", tape->name, __func__);
-
- while (stage) {
- nstage = stage->next;
- idetape_kfree_stage(tape, stage);
- --tape->nr_stages;
- --tape->nr_pending_stages;
- stage = nstage;
- }
- if (new_last_stage)
- new_last_stage->next = NULL;
- tape->last_stage = new_last_stage;
- tape->next_stage = NULL;
+ kfree(tape->merge_bh);
}
-/*
- * Finish servicing a request and insert a pending pipeline request into the
- * main device queue.
- */
static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
{
struct request *rq = HWGROUP(drive)->rq;
idetape_tape_t *tape = drive->driver_data;
unsigned long flags;
int error;
- int remove_stage = 0;
- idetape_stage_t *active_stage;
debug_log(DBG_PROCS, "Enter %s\n", __func__);
spin_lock_irqsave(&tape->lock, flags);
- /* The request was a pipelined data transfer request */
- if (tape->active_data_rq == rq) {
- active_stage = tape->active_stage;
- tape->active_stage = NULL;
- tape->active_data_rq = NULL;
- tape->nr_pending_stages--;
- if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
- remove_stage = 1;
- if (error) {
- set_bit(IDETAPE_FLAG_PIPELINE_ERR,
- &tape->flags);
- if (error == IDETAPE_ERROR_EOD)
- idetape_abort_pipeline(drive,
- active_stage);
- }
- } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
- if (error == IDETAPE_ERROR_EOD) {
- set_bit(IDETAPE_FLAG_PIPELINE_ERR,
- &tape->flags);
- idetape_abort_pipeline(drive, active_stage);
- }
- }
- if (tape->next_stage != NULL) {
- idetape_activate_next_stage(drive);
-
- /* Insert the next request into the request queue. */
- (void)ide_do_drive_cmd(drive, tape->active_data_rq,
- ide_end);
- } else if (!error) {
- /*
- * This is a part of the feedback loop which tries to
- * find the optimum number of stages. We are starting
- * from a minimum maximum number of stages, and if we
- * sense that the pipeline is empty, we try to increase
- * it, until we reach the user compile time memory
- * limit.
- */
- int i = (tape->max_pipeline - tape->min_pipeline) / 10;
-
- tape->max_stages += max(i, 1);
- tape->max_stages = max(tape->max_stages,
- tape->min_pipeline);
- tape->max_stages = min(tape->max_stages,
- tape->max_pipeline);
- }
- }
ide_end_drive_cmd(drive, 0, 0);
- if (remove_stage)
- idetape_remove_stage_head(drive);
- if (tape->active_data_rq == NULL)
- clear_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags);
spin_unlock_irqrestore(&tape->lock, flags);
return 0;
}
static void idetape_init_rq(struct request *rq, u8 cmd)
{
- memset(rq, 0, sizeof(*rq));
+ blk_rq_init(NULL, rq);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd[0] = cmd;
}
struct ide_tape_obj *tape = drive->driver_data;
idetape_init_rq(rq, REQ_IDETAPE_PC1);
+ rq->cmd_flags |= REQ_PREEMPT;
rq->buffer = (char *) pc;
rq->rq_disk = tape->disk;
(void) ide_do_drive_cmd(drive, rq, ide_preempt);
return ide_do_reset(drive);
}
/* Get the number of bytes to transfer on this interrupt. */
- bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
- hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
+ bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
+ hwif->INB(hwif->io_ports.lbam_addr);
- ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
+ ireason = hwif->INB(hwif->io_ports.nsect_addr);
if (ireason & CD) {
printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__);
printk(KERN_ERR "ide-tape: The tape wants to "
"send us more data than expected "
"- discarding data\n");
- ide_atapi_discard_data(drive, bcount);
+ ide_pad_transfer(drive, 0, bcount);
ide_set_handler(drive, &idetape_pc_intr,
IDETAPE_WAIT_CMD, NULL);
return ide_started;
"data than expected - allowing transfer\n");
}
iobuf = &idetape_input_buffers;
- xferfunc = hwif->atapi_input_bytes;
+ xferfunc = hwif->input_data;
} else {
iobuf = &idetape_output_buffers;
- xferfunc = hwif->atapi_output_bytes;
+ xferfunc = hwif->output_data;
}
if (pc->bh)
iobuf(drive, pc, bcount);
else
- xferfunc(drive, pc->cur_pos, bcount);
+ xferfunc(drive, NULL, pc->cur_pos, bcount);
/* Update the current position */
pc->xferred += bcount;
"yet DRQ isn't asserted\n");
return startstop;
}
- ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
+ ireason = hwif->INB(hwif->io_ports.nsect_addr);
while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
"a packet command, retrying\n");
udelay(100);
- ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
+ ireason = hwif->INB(hwif->io_ports.nsect_addr);
if (retries == 0) {
printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
"issuing a packet command, ignoring\n");
hwif->dma_ops->dma_start(drive);
#endif
/* Send the actual packet */
- HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
+ hwif->output_data(drive, NULL, pc->c, 12);
+
return ide_started;
}
if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma)
dma_ok = !hwif->dma_ops->dma_setup(drive);
- ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
- IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
+ ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
if (dma_ok)
/* Will begin DMA later */
IDETAPE_WAIT_CMD, NULL);
return ide_started;
} else {
- hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
+ ide_execute_pkt_cmd(drive);
return idetape_transfer_pc(drive);
}
}
pc->idetape_callback = &idetape_pc_callback;
}
-static void idetape_calculate_speeds(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- if (time_after(jiffies,
- tape->controlled_pipeline_head_time + 120 * HZ)) {
- tape->controlled_previous_pipeline_head =
- tape->controlled_last_pipeline_head;
- tape->controlled_previous_head_time =
- tape->controlled_pipeline_head_time;
- tape->controlled_last_pipeline_head = tape->pipeline_head;
- tape->controlled_pipeline_head_time = jiffies;
- }
- if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
- tape->controlled_pipeline_head_speed = (tape->pipeline_head -
- tape->controlled_last_pipeline_head) * 32 * HZ /
- (jiffies - tape->controlled_pipeline_head_time);
- else if (time_after(jiffies, tape->controlled_previous_head_time))
- tape->controlled_pipeline_head_speed = (tape->pipeline_head -
- tape->controlled_previous_pipeline_head) * 32 *
- HZ / (jiffies - tape->controlled_previous_head_time);
-
- if (tape->nr_pending_stages < tape->max_stages/*- 1 */) {
- /* -1 for read mode error recovery */
- if (time_after(jiffies, tape->uncontrolled_previous_head_time +
- 10 * HZ)) {
- tape->uncontrolled_pipeline_head_time = jiffies;
- tape->uncontrolled_pipeline_head_speed =
- (tape->pipeline_head -
- tape->uncontrolled_previous_pipeline_head) *
- 32 * HZ / (jiffies -
- tape->uncontrolled_previous_head_time);
- }
- } else {
- tape->uncontrolled_previous_head_time = jiffies;
- tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
- if (time_after(jiffies, tape->uncontrolled_pipeline_head_time +
- 30 * HZ))
- tape->uncontrolled_pipeline_head_time = jiffies;
-
- }
- tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed,
- tape->controlled_pipeline_head_speed);
-
- if (tape->speed_control == 1) {
- if (tape->nr_pending_stages >= tape->max_stages / 2)
- tape->max_insert_speed = tape->pipeline_head_speed +
- (1100 - tape->pipeline_head_speed) * 2 *
- (tape->nr_pending_stages - tape->max_stages / 2)
- / tape->max_stages;
- else
- tape->max_insert_speed = 500 +
- (tape->pipeline_head_speed - 500) * 2 *
- tape->nr_pending_stages / tape->max_stages;
-
- if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
- tape->max_insert_speed = 5000;
- } else
- tape->max_insert_speed = tape->speed_control;
-
- tape->max_insert_speed = max(tape->max_insert_speed, 500);
-}
-
static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
int blocks = tape->pc->xferred / tape->blk_size;
tape->avg_size += blocks * tape->blk_size;
- tape->insert_size += blocks * tape->blk_size;
- if (tape->insert_size > 1024 * 1024)
- tape->measure_insert_time = 1;
- if (tape->measure_insert_time) {
- tape->measure_insert_time = 0;
- tape->insert_time = jiffies;
- tape->insert_size = 0;
- }
- if (time_after(jiffies, tape->insert_time))
- tape->insert_speed = tape->insert_size / 1024 * HZ /
- (jiffies - tape->insert_time);
+
if (time_after_eq(jiffies, tape->avg_time + HZ)) {
tape->avg_speed = tape->avg_size * HZ /
(jiffies - tape->avg_time) / 1024;
pc->buf = NULL;
pc->buf_size = length * tape->blk_size;
pc->req_xfer = pc->buf_size;
- if (pc->req_xfer == tape->stage_size)
+ if (pc->req_xfer == tape->buffer_size)
pc->flags |= PC_FLAG_DMA_RECOMMENDED;
}
pc->buf = NULL;
pc->buf_size = length * tape->blk_size;
pc->req_xfer = pc->buf_size;
- if (pc->req_xfer == tape->stage_size)
+ if (pc->req_xfer == tape->buffer_size)
pc->flags |= PC_FLAG_DMA_RECOMMENDED;
}
drive->post_reset = 0;
}
- if (time_after(jiffies, tape->insert_time))
- tape->insert_speed = tape->insert_size / 1024 * HZ /
- (jiffies - tape->insert_time);
- idetape_calculate_speeds(drive);
if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) &&
(stat & SEEK_STAT) == 0) {
if (postponed_rq == NULL) {
return ide_stopped;
}
if (rq->cmd[0] & REQ_IDETAPE_READ) {
- tape->buffer_head++;
- tape->postpone_cnt = 0;
pc = idetape_next_pc_storage(drive);
idetape_create_read_cmd(tape, pc, rq->current_nr_sectors,
(struct idetape_bh *)rq->special);
goto out;
}
if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
- tape->buffer_head++;
- tape->postpone_cnt = 0;
pc = idetape_next_pc_storage(drive);
idetape_create_write_cmd(tape, pc, rq->current_nr_sectors,
(struct idetape_bh *)rq->special);
return idetape_issue_pc(drive, pc);
}
-/* Pipeline related functions */
-
/*
- * The function below uses __get_free_page to allocate a pipeline stage, along
- * with all the necessary small buffers which together make a buffer of size
- * tape->stage_size (or a bit more). We attempt to combine sequential pages as
+ * The function below uses __get_free_pages to allocate a data buffer of size
+ * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
* much as possible.
*
- * It returns a pointer to the new allocated stage, or NULL if we can't (or
- * don't want to) allocate a stage.
- *
- * Pipeline stages are optional and are used to increase performance. If we
- * can't allocate them, we'll manage without them.
+ * It returns a pointer to the newly allocated buffer, or NULL in case of
+ * failure.
*/
-static idetape_stage_t *__idetape_kmalloc_stage(idetape_tape_t *tape, int full,
- int clear)
+static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
+ int full, int clear)
{
- idetape_stage_t *stage;
- struct idetape_bh *prev_bh, *bh;
- int pages = tape->pages_per_stage;
+ struct idetape_bh *prev_bh, *bh, *merge_bh;
+ int pages = tape->pages_per_buffer;
+ unsigned int order, b_allocd;
char *b_data = NULL;
- stage = kmalloc(sizeof(idetape_stage_t), GFP_KERNEL);
- if (!stage)
- return NULL;
- stage->next = NULL;
-
- stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
- bh = stage->bh;
+ merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
+ bh = merge_bh;
if (bh == NULL)
goto abort;
- bh->b_reqnext = NULL;
- bh->b_data = (char *) __get_free_page(GFP_KERNEL);
+
+ order = fls(pages) - 1;
+ bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
if (!bh->b_data)
goto abort;
+ b_allocd = (1 << order) * PAGE_SIZE;
+ pages &= (order-1);
+
if (clear)
- memset(bh->b_data, 0, PAGE_SIZE);
- bh->b_size = PAGE_SIZE;
+ memset(bh->b_data, 0, b_allocd);
+ bh->b_reqnext = NULL;
+ bh->b_size = b_allocd;
atomic_set(&bh->b_count, full ? bh->b_size : 0);
- while (--pages) {
- b_data = (char *) __get_free_page(GFP_KERNEL);
+ while (pages) {
+ order = fls(pages) - 1;
+ b_data = (char *) __get_free_pages(GFP_KERNEL, order);
if (!b_data)
goto abort;
+ b_allocd = (1 << order) * PAGE_SIZE;
+
if (clear)
- memset(b_data, 0, PAGE_SIZE);
- if (bh->b_data == b_data + PAGE_SIZE) {
- bh->b_size += PAGE_SIZE;
- bh->b_data -= PAGE_SIZE;
+ memset(b_data, 0, b_allocd);
+
+ /* newly allocated page frames below buffer header or ...*/
+ if (bh->b_data == b_data + b_allocd) {
+ bh->b_size += b_allocd;
+ bh->b_data -= b_allocd;
if (full)
- atomic_add(PAGE_SIZE, &bh->b_count);
+ atomic_add(b_allocd, &bh->b_count);
continue;
}
+ /* they are above the header */
if (b_data == bh->b_data + bh->b_size) {
- bh->b_size += PAGE_SIZE;
+ bh->b_size += b_allocd;
if (full)
- atomic_add(PAGE_SIZE, &bh->b_count);
+ atomic_add(b_allocd, &bh->b_count);
continue;
}
prev_bh = bh;
bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
if (!bh) {
- free_page((unsigned long) b_data);
+ free_pages((unsigned long) b_data, order);
goto abort;
}
bh->b_reqnext = NULL;
bh->b_data = b_data;
- bh->b_size = PAGE_SIZE;
+ bh->b_size = b_allocd;
atomic_set(&bh->b_count, full ? bh->b_size : 0);
prev_bh->b_reqnext = bh;
+
+ pages &= (order-1);
}
+
bh->b_size -= tape->excess_bh_size;
if (full)
atomic_sub(tape->excess_bh_size, &bh->b_count);
- return stage;
+ return merge_bh;
abort:
- __idetape_kfree_stage(stage);
+ ide_tape_kfree_buffer(tape);
return NULL;
}
-static idetape_stage_t *idetape_kmalloc_stage(idetape_tape_t *tape)
-{
- debug_log(DBG_PROCS, "Enter %s\n", __func__);
-
- if (tape->nr_stages >= tape->max_stages)
- return NULL;
- return __idetape_kmalloc_stage(tape, 0, 0);
-}
-
static int idetape_copy_stage_from_user(idetape_tape_t *tape,
- idetape_stage_t *stage, const char __user *buf, int n)
+ const char __user *buf, int n)
{
struct idetape_bh *bh = tape->bh;
int count;
}
static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
- idetape_stage_t *stage, int n)
+ int n)
{
struct idetape_bh *bh = tape->bh;
int count;
return ret;
}
-static void idetape_init_merge_stage(idetape_tape_t *tape)
+static void idetape_init_merge_buffer(idetape_tape_t *tape)
{
- struct idetape_bh *bh = tape->merge_stage->bh;
+ struct idetape_bh *bh = tape->merge_bh;
+ tape->bh = tape->merge_bh;
- tape->bh = bh;
if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
atomic_set(&bh->b_count, 0);
else {
}
}
-static void idetape_switch_buffers(idetape_tape_t *tape, idetape_stage_t *stage)
-{
- struct idetape_bh *tmp;
-
- tmp = stage->bh;
- stage->bh = tape->merge_stage->bh;
- tape->merge_stage->bh = tmp;
- idetape_init_merge_stage(tape);
-}
-
-/* Add a new stage at the end of the pipeline. */
-static void idetape_add_stage_tail(ide_drive_t *drive, idetape_stage_t *stage)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
-
- debug_log(DBG_PROCS, "Enter %s\n", __func__);
-
- spin_lock_irqsave(&tape->lock, flags);
- stage->next = NULL;
- if (tape->last_stage != NULL)
- tape->last_stage->next = stage;
- else
- tape->first_stage = stage;
- tape->next_stage = stage;
- tape->last_stage = stage;
- if (tape->next_stage == NULL)
- tape->next_stage = tape->last_stage;
- tape->nr_stages++;
- tape->nr_pending_stages++;
- spin_unlock_irqrestore(&tape->lock, flags);
-}
-
-/* Install a completion in a pending request and sleep until it is serviced. The
- * caller should ensure that the request will not be serviced before we install
- * the completion (usually by disabling interrupts).
- */
-static void idetape_wait_for_request(ide_drive_t *drive, struct request *rq)
-{
- DECLARE_COMPLETION_ONSTACK(wait);
- idetape_tape_t *tape = drive->driver_data;
-
- if (rq == NULL || !blk_special_request(rq)) {
- printk(KERN_ERR "ide-tape: bug: Trying to sleep on non-valid"
- " request\n");
- return;
- }
- rq->end_io_data = &wait;
- rq->end_io = blk_end_sync_rq;
- spin_unlock_irq(&tape->lock);
- wait_for_completion(&wait);
- /* The stage and its struct request have been deallocated */
- spin_lock_irq(&tape->lock);
-}
-
static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
* to the request list without waiting for it to be serviced! In that case, we
* usually use idetape_queue_pc_head().
*/
-static int __idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
+static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
{
struct ide_tape_obj *tape = drive->driver_data;
- struct request rq;
+ struct request *rq;
+ int error;
- idetape_init_rq(&rq, REQ_IDETAPE_PC1);
- rq.buffer = (char *) pc;
- rq.rq_disk = tape->disk;
- return ide_do_drive_cmd(drive, &rq, ide_wait);
+ rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+ rq->cmd_type = REQ_TYPE_SPECIAL;
+ rq->cmd[0] = REQ_IDETAPE_PC1;
+ rq->buffer = (char *)pc;
+ error = blk_execute_rq(drive->queue, tape->disk, rq, 0);
+ blk_put_request(rq);
+ return error;
}
static void idetape_create_load_unload_cmd(ide_drive_t *drive,
timeout += jiffies;
while (time_before(jiffies, timeout)) {
idetape_create_test_unit_ready_cmd(&pc);
- if (!__idetape_queue_pc_tail(drive, &pc))
+ if (!idetape_queue_pc_tail(drive, &pc))
return 0;
if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
|| (tape->asc == 0x3A)) {
return -ENOMEDIUM;
idetape_create_load_unload_cmd(drive, &pc,
IDETAPE_LU_LOAD_MASK);
- __idetape_queue_pc_tail(drive, &pc);
+ idetape_queue_pc_tail(drive, &pc);
load_attempted = 1;
/* not about to be ready */
} else if (!(tape->sense_key == 2 && tape->asc == 4 &&
return -EIO;
}
-static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
-{
- return __idetape_queue_pc_tail(drive, pc);
-}
-
static int idetape_flush_tape_buffers(ide_drive_t *drive)
{
struct ide_atapi_pc pc;
return 1;
}
-static int __idetape_discard_read_pipeline(ide_drive_t *drive)
+static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
- int cnt;
if (tape->chrdev_dir != IDETAPE_DIR_READ)
- return 0;
+ return;
- /* Remove merge stage. */
- cnt = tape->merge_stage_size / tape->blk_size;
- if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
- ++cnt; /* Filemarks count as 1 sector */
- tape->merge_stage_size = 0;
- if (tape->merge_stage != NULL) {
- __idetape_kfree_stage(tape->merge_stage);
- tape->merge_stage = NULL;
+ clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags);
+ tape->merge_bh_size = 0;
+ if (tape->merge_bh != NULL) {
+ ide_tape_kfree_buffer(tape);
+ tape->merge_bh = NULL;
}
- /* Clear pipeline flags. */
- clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags);
tape->chrdev_dir = IDETAPE_DIR_NONE;
-
- /* Remove pipeline stages. */
- if (tape->first_stage == NULL)
- return 0;
-
- spin_lock_irqsave(&tape->lock, flags);
- tape->next_stage = NULL;
- if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags))
- idetape_wait_for_request(drive, tape->active_data_rq);
- spin_unlock_irqrestore(&tape->lock, flags);
-
- while (tape->first_stage != NULL) {
- struct request *rq_ptr = &tape->first_stage->rq;
-
- cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
- if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
- ++cnt;
- idetape_remove_stage_head(drive);
- }
- tape->nr_pending_stages = 0;
- tape->max_stages = tape->min_pipeline;
- return cnt;
}
/*
struct ide_atapi_pc pc;
if (tape->chrdev_dir == IDETAPE_DIR_READ)
- __idetape_discard_read_pipeline(drive);
+ __ide_tape_discard_merge_buffer(drive);
idetape_wait_ready(drive, 60 * 5 * HZ);
idetape_create_locate_cmd(drive, &pc, block, partition, skip);
retval = idetape_queue_pc_tail(drive, &pc);
return (idetape_queue_pc_tail(drive, &pc));
}
-static void idetape_discard_read_pipeline(ide_drive_t *drive,
+static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
int restore_position)
{
idetape_tape_t *tape = drive->driver_data;
- int cnt;
int seek, position;
- cnt = __idetape_discard_read_pipeline(drive);
+ __ide_tape_discard_merge_buffer(drive);
if (restore_position) {
position = idetape_read_position(drive);
- seek = position > cnt ? position - cnt : 0;
+ seek = position > 0 ? position : 0;
if (idetape_position_tape(drive, seek, 0, 0)) {
printk(KERN_INFO "ide-tape: %s: position_tape failed in"
- " discard_pipeline()\n", tape->name);
+ " %s\n", tape->name, __func__);
return;
}
}
struct idetape_bh *bh)
{
idetape_tape_t *tape = drive->driver_data;
- struct request rq;
+ struct request *rq;
+ int ret, errors;
debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
- if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
- printk(KERN_ERR "ide-tape: bug: the pipeline is active in %s\n",
- __func__);
- return (0);
- }
+ rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+ rq->cmd_type = REQ_TYPE_SPECIAL;
+ rq->cmd[0] = cmd;
+ rq->rq_disk = tape->disk;
+ rq->special = (void *)bh;
+ rq->sector = tape->first_frame;
+ rq->nr_sectors = blocks;
+ rq->current_nr_sectors = blocks;
+ blk_execute_rq(drive->queue, tape->disk, rq, 0);
- idetape_init_rq(&rq, cmd);
- rq.rq_disk = tape->disk;
- rq.special = (void *)bh;
- rq.sector = tape->first_frame;
- rq.nr_sectors = blocks;
- rq.current_nr_sectors = blocks;
- (void) ide_do_drive_cmd(drive, &rq, ide_wait);
+ errors = rq->errors;
+ ret = tape->blk_size * (blocks - rq->current_nr_sectors);
+ blk_put_request(rq);
if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
return 0;
- if (tape->merge_stage)
- idetape_init_merge_stage(tape);
- if (rq.errors == IDETAPE_ERROR_GENERAL)
+ if (tape->merge_bh)
+ idetape_init_merge_buffer(tape);
+ if (errors == IDETAPE_ERROR_GENERAL)
return -EIO;
- return (tape->blk_size * (blocks-rq.current_nr_sectors));
-}
-
-/* start servicing the pipeline stages, starting from tape->next_stage. */
-static void idetape_plug_pipeline(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- if (tape->next_stage == NULL)
- return;
- if (!test_and_set_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
- idetape_activate_next_stage(drive);
- (void) ide_do_drive_cmd(drive, tape->active_data_rq, ide_end);
- }
+ return ret;
}
static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
pc->idetape_callback = &idetape_pc_callback;
}
-static void idetape_wait_first_stage(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
-
- if (tape->first_stage == NULL)
- return;
- spin_lock_irqsave(&tape->lock, flags);
- if (tape->active_stage == tape->first_stage)
- idetape_wait_for_request(drive, tape->active_data_rq);
- spin_unlock_irqrestore(&tape->lock, flags);
-}
-
-/*
- * Try to add a character device originated write request to our pipeline. In
- * case we don't succeed, we revert to non-pipelined operation mode for this
- * request. In order to accomplish that, we
- *
- * 1. Try to allocate a new pipeline stage.
- * 2. If we can't, wait for more and more requests to be serviced and try again
- * each time.
- * 3. If we still can't allocate a stage, fallback to non-pipelined operation
- * mode for this request.
- */
+/* Queue up a character device originated write request. */
static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
{
idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *new_stage;
- unsigned long flags;
- struct request *rq;
debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
- /* Attempt to allocate a new stage. Beware possible race conditions. */
- while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
- spin_lock_irqsave(&tape->lock, flags);
- if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
- idetape_wait_for_request(drive, tape->active_data_rq);
- spin_unlock_irqrestore(&tape->lock, flags);
- } else {
- spin_unlock_irqrestore(&tape->lock, flags);
- idetape_plug_pipeline(drive);
- if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE,
- &tape->flags))
- continue;
- /*
- * The machine is short on memory. Fallback to non-
- * pipelined operation mode for this request.
- */
- return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
- blocks, tape->merge_stage->bh);
- }
- }
- rq = &new_stage->rq;
- idetape_init_rq(rq, REQ_IDETAPE_WRITE);
- /* Doesn't actually matter - We always assume sequential access */
- rq->sector = tape->first_frame;
- rq->current_nr_sectors = blocks;
- rq->nr_sectors = blocks;
-
- idetape_switch_buffers(tape, new_stage);
- idetape_add_stage_tail(drive, new_stage);
- tape->pipeline_head++;
- idetape_calculate_speeds(drive);
-
- /*
- * Estimate whether the tape has stopped writing by checking if our
- * write pipeline is currently empty. If we are not writing anymore,
- * wait for the pipeline to be almost completely full (90%) before
- * starting to service requests, so that we will be able to keep up with
- * the higher speeds of the tape.
- */
- if (!test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
- if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
- tape->nr_stages >= tape->max_stages -
- tape->uncontrolled_pipeline_head_speed * 3 * 1024 /
- tape->blk_size) {
- tape->measure_insert_time = 1;
- tape->insert_time = jiffies;
- tape->insert_size = 0;
- tape->insert_speed = 0;
- idetape_plug_pipeline(drive);
- }
- }
- if (test_and_clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags))
- /* Return a deferred error */
- return -EIO;
- return blocks;
+ return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
+ blocks, tape->merge_bh);
}
-/*
- * Wait until all pending pipeline requests are serviced. Typically called on
- * device close.
- */
-static void idetape_wait_for_pipeline(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
-
- while (tape->next_stage || test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE,
- &tape->flags)) {
- idetape_plug_pipeline(drive);
- spin_lock_irqsave(&tape->lock, flags);
- if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags))
- idetape_wait_for_request(drive, tape->active_data_rq);
- spin_unlock_irqrestore(&tape->lock, flags);
- }
-}
-
-static void idetape_empty_write_pipeline(ide_drive_t *drive)
+static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
int blocks, min;
struct idetape_bh *bh;
if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
- printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline,"
+ printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
" but we are not writing.\n");
return;
}
- if (tape->merge_stage_size > tape->stage_size) {
+ if (tape->merge_bh_size > tape->buffer_size) {
printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
- tape->merge_stage_size = tape->stage_size;
+ tape->merge_bh_size = tape->buffer_size;
}
- if (tape->merge_stage_size) {
- blocks = tape->merge_stage_size / tape->blk_size;
- if (tape->merge_stage_size % tape->blk_size) {
+ if (tape->merge_bh_size) {
+ blocks = tape->merge_bh_size / tape->blk_size;
+ if (tape->merge_bh_size % tape->blk_size) {
unsigned int i;
blocks++;
- i = tape->blk_size - tape->merge_stage_size %
+ i = tape->blk_size - tape->merge_bh_size %
tape->blk_size;
bh = tape->bh->b_reqnext;
while (bh) {
}
}
(void) idetape_add_chrdev_write_request(drive, blocks);
- tape->merge_stage_size = 0;
+ tape->merge_bh_size = 0;
}
- idetape_wait_for_pipeline(drive);
- if (tape->merge_stage != NULL) {
- __idetape_kfree_stage(tape->merge_stage);
- tape->merge_stage = NULL;
+ if (tape->merge_bh != NULL) {
+ ide_tape_kfree_buffer(tape);
+ tape->merge_bh = NULL;
}
- clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags);
tape->chrdev_dir = IDETAPE_DIR_NONE;
-
- /*
- * On the next backup, perform the feedback loop again. (I don't want to
- * keep sense information between backups, as some systems are
- * constantly on, and the system load can be totally different on the
- * next backup).
- */
- tape->max_stages = tape->min_pipeline;
- if (tape->first_stage != NULL ||
- tape->next_stage != NULL ||
- tape->last_stage != NULL ||
- tape->nr_stages != 0) {
- printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
- "first_stage %p, next_stage %p, "
- "last_stage %p, nr_stages %d\n",
- tape->first_stage, tape->next_stage,
- tape->last_stage, tape->nr_stages);
- }
-}
-
-static void idetape_restart_speed_control(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- tape->restart_speed_control_req = 0;
- tape->pipeline_head = 0;
- tape->controlled_last_pipeline_head = 0;
- tape->controlled_previous_pipeline_head = 0;
- tape->uncontrolled_previous_pipeline_head = 0;
- tape->controlled_pipeline_head_speed = 5000;
- tape->pipeline_head_speed = 5000;
- tape->uncontrolled_pipeline_head_speed = 0;
- tape->controlled_pipeline_head_time =
- tape->uncontrolled_pipeline_head_time = jiffies;
- tape->controlled_previous_head_time =
- tape->uncontrolled_previous_head_time = jiffies;
}
-static int idetape_init_read(ide_drive_t *drive, int max_stages)
+static int idetape_init_read(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *new_stage;
- struct request rq;
int bytes_read;
- u16 blocks = *(u16 *)&tape->caps[12];
/* Initialize read operation */
if (tape->chrdev_dir != IDETAPE_DIR_READ) {
if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
- idetape_empty_write_pipeline(drive);
+ ide_tape_flush_merge_buffer(drive);
idetape_flush_tape_buffers(drive);
}
- if (tape->merge_stage || tape->merge_stage_size) {
- printk(KERN_ERR "ide-tape: merge_stage_size should be"
+ if (tape->merge_bh || tape->merge_bh_size) {
+ printk(KERN_ERR "ide-tape: merge_bh_size should be"
" 0 now\n");
- tape->merge_stage_size = 0;
+ tape->merge_bh_size = 0;
}
- tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
- if (!tape->merge_stage)
+ tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
+ if (!tape->merge_bh)
return -ENOMEM;
tape->chrdev_dir = IDETAPE_DIR_READ;
if (drive->dsc_overlap) {
bytes_read = idetape_queue_rw_tail(drive,
REQ_IDETAPE_READ, 0,
- tape->merge_stage->bh);
+ tape->merge_bh);
if (bytes_read < 0) {
- __idetape_kfree_stage(tape->merge_stage);
- tape->merge_stage = NULL;
+ ide_tape_kfree_buffer(tape);
+ tape->merge_bh = NULL;
tape->chrdev_dir = IDETAPE_DIR_NONE;
return bytes_read;
}
}
}
- if (tape->restart_speed_control_req)
- idetape_restart_speed_control(drive);
- idetape_init_rq(&rq, REQ_IDETAPE_READ);
- rq.sector = tape->first_frame;
- rq.nr_sectors = blocks;
- rq.current_nr_sectors = blocks;
- if (!test_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags) &&
- tape->nr_stages < max_stages) {
- new_stage = idetape_kmalloc_stage(tape);
- while (new_stage != NULL) {
- new_stage->rq = rq;
- idetape_add_stage_tail(drive, new_stage);
- if (tape->nr_stages >= max_stages)
- break;
- new_stage = idetape_kmalloc_stage(tape);
- }
- }
- if (!test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) {
- if (tape->nr_pending_stages >= 3 * max_stages / 4) {
- tape->measure_insert_time = 1;
- tape->insert_time = jiffies;
- tape->insert_size = 0;
- tape->insert_speed = 0;
- idetape_plug_pipeline(drive);
- }
- }
+
return 0;
}
-/*
- * Called from idetape_chrdev_read() to service a character device read request
- * and add read-ahead requests to our pipeline.
- */
+/* called from idetape_chrdev_read() to service a chrdev read request. */
static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
{
idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
- struct request *rq_ptr;
- int bytes_read;
debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
return 0;
- /* Wait for the next block to reach the head of the pipeline. */
- idetape_init_read(drive, tape->max_stages);
- if (tape->first_stage == NULL) {
- if (test_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags))
- return 0;
- return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
- tape->merge_stage->bh);
- }
- idetape_wait_first_stage(drive);
- rq_ptr = &tape->first_stage->rq;
- bytes_read = tape->blk_size * (rq_ptr->nr_sectors -
- rq_ptr->current_nr_sectors);
- rq_ptr->nr_sectors = 0;
- rq_ptr->current_nr_sectors = 0;
+ idetape_init_read(drive);
- if (rq_ptr->errors == IDETAPE_ERROR_EOD)
- return 0;
- else {
- idetape_switch_buffers(tape, tape->first_stage);
- if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
- set_bit(IDETAPE_FLAG_FILEMARK, &tape->flags);
- spin_lock_irqsave(&tape->lock, flags);
- idetape_remove_stage_head(drive);
- spin_unlock_irqrestore(&tape->lock, flags);
- tape->pipeline_head++;
- idetape_calculate_speeds(drive);
- }
- if (bytes_read > blocks * tape->blk_size) {
- printk(KERN_ERR "ide-tape: bug: trying to return more bytes"
- " than requested\n");
- bytes_read = blocks * tape->blk_size;
- }
- return (bytes_read);
+ return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
+ tape->merge_bh);
}
static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
while (bcount) {
unsigned int count;
- bh = tape->merge_stage->bh;
- count = min(tape->stage_size, bcount);
+ bh = tape->merge_bh;
+ count = min(tape->buffer_size, bcount);
bcount -= count;
blocks = count / tape->blk_size;
while (count) {
bh = bh->b_reqnext;
}
idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
- tape->merge_stage->bh);
+ tape->merge_bh);
}
}
-static int idetape_pipeline_size(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage;
- struct request *rq;
- int size = 0;
-
- idetape_wait_for_pipeline(drive);
- stage = tape->first_stage;
- while (stage != NULL) {
- rq = &stage->rq;
- size += tape->blk_size * (rq->nr_sectors -
- rq->current_nr_sectors);
- if (rq->errors == IDETAPE_ERROR_FILEMARK)
- size += tape->blk_size;
- stage = stage->next;
- }
- size += tape->merge_stage_size;
- return size;
-}
-
/*
* Rewinds the tape to the Beginning Of the current Partition (BOP). We
* currently support only one partition.
if (copy_from_user(&config, argp, sizeof(config)))
return -EFAULT;
tape->best_dsc_rw_freq = config.dsc_rw_frequency;
- tape->max_stages = config.nr_stages;
break;
case 0x0350:
config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
- config.nr_stages = tape->max_stages;
+ config.nr_stages = 1;
if (copy_to_user(argp, &config, sizeof(config)))
return -EFAULT;
break;
return 0;
}
-/*
- * The function below is now a bit more complicated than just passing the
- * command to the tape since we may have crossed some filemarks during our
- * pipelined read-ahead mode. As a minor side effect, the pipeline enables us to
- * support MTFSFM when the filemark is in our internal pipeline even if the tape
- * doesn't support spacing over filemarks in the reverse direction.
- */
static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
int mt_count)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc pc;
- unsigned long flags;
int retval, count = 0;
int sprev = !!(tape->caps[4] & 0x20);
}
if (tape->chrdev_dir == IDETAPE_DIR_READ) {
- /* its a read-ahead buffer, scan it for crossed filemarks. */
- tape->merge_stage_size = 0;
+ tape->merge_bh_size = 0;
if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
++count;
- while (tape->first_stage != NULL) {
- if (count == mt_count) {
- if (mt_op == MTFSFM)
- set_bit(IDETAPE_FLAG_FILEMARK,
- &tape->flags);
- return 0;
- }
- spin_lock_irqsave(&tape->lock, flags);
- if (tape->first_stage == tape->active_stage) {
- /*
- * We have reached the active stage in the read
- * pipeline. There is no point in allowing the
- * drive to continue reading any farther, so we
- * stop the pipeline.
- *
- * This section should be moved to a separate
- * subroutine because similar operations are
- * done in __idetape_discard_read_pipeline(),
- * for example.
- */
- tape->next_stage = NULL;
- spin_unlock_irqrestore(&tape->lock, flags);
- idetape_wait_first_stage(drive);
- tape->next_stage = tape->first_stage->next;
- } else
- spin_unlock_irqrestore(&tape->lock, flags);
- if (tape->first_stage->rq.errors ==
- IDETAPE_ERROR_FILEMARK)
- ++count;
- idetape_remove_stage_head(drive);
- }
- idetape_discard_read_pipeline(drive, 0);
+ ide_tape_discard_merge_buffer(drive, 0);
}
- /*
- * The filemark was not found in our internal pipeline; now we can issue
- * the space command.
- */
switch (mt_op) {
case MTFSF:
case MTBSF:
(count % tape->blk_size) == 0)
tape->user_bs_factor = count / tape->blk_size;
}
- rc = idetape_init_read(drive, tape->max_stages);
+ rc = idetape_init_read(drive);
if (rc < 0)
return rc;
if (count == 0)
return (0);
- if (tape->merge_stage_size) {
- actually_read = min((unsigned int)(tape->merge_stage_size),
+ if (tape->merge_bh_size) {
+ actually_read = min((unsigned int)(tape->merge_bh_size),
(unsigned int)count);
- if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage,
- actually_read))
+ if (idetape_copy_stage_to_user(tape, buf, actually_read))
ret = -EFAULT;
buf += actually_read;
- tape->merge_stage_size -= actually_read;
+ tape->merge_bh_size -= actually_read;
count -= actually_read;
}
- while (count >= tape->stage_size) {
+ while (count >= tape->buffer_size) {
bytes_read = idetape_add_chrdev_read_request(drive, ctl);
if (bytes_read <= 0)
goto finish;
- if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage,
- bytes_read))
+ if (idetape_copy_stage_to_user(tape, buf, bytes_read))
ret = -EFAULT;
buf += bytes_read;
count -= bytes_read;
if (bytes_read <= 0)
goto finish;
temp = min((unsigned long)count, (unsigned long)bytes_read);
- if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage,
- temp))
+ if (idetape_copy_stage_to_user(tape, buf, temp))
ret = -EFAULT;
actually_read += temp;
- tape->merge_stage_size = bytes_read-temp;
+ tape->merge_bh_size = bytes_read-temp;
}
finish:
if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) {
/* Initialize write operation */
if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
if (tape->chrdev_dir == IDETAPE_DIR_READ)
- idetape_discard_read_pipeline(drive, 1);
- if (tape->merge_stage || tape->merge_stage_size) {
- printk(KERN_ERR "ide-tape: merge_stage_size "
+ ide_tape_discard_merge_buffer(drive, 1);
+ if (tape->merge_bh || tape->merge_bh_size) {
+ printk(KERN_ERR "ide-tape: merge_bh_size "
"should be 0 now\n");
- tape->merge_stage_size = 0;
+ tape->merge_bh_size = 0;
}
- tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
- if (!tape->merge_stage)
+ tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
+ if (!tape->merge_bh)
return -ENOMEM;
tape->chrdev_dir = IDETAPE_DIR_WRITE;
- idetape_init_merge_stage(tape);
+ idetape_init_merge_buffer(tape);
/*
* Issue a write 0 command to ensure that DSC handshake is
if (drive->dsc_overlap) {
ssize_t retval = idetape_queue_rw_tail(drive,
REQ_IDETAPE_WRITE, 0,
- tape->merge_stage->bh);
+ tape->merge_bh);
if (retval < 0) {
- __idetape_kfree_stage(tape->merge_stage);
- tape->merge_stage = NULL;
+ ide_tape_kfree_buffer(tape);
+ tape->merge_bh = NULL;
tape->chrdev_dir = IDETAPE_DIR_NONE;
return retval;
}
}
if (count == 0)
return (0);
- if (tape->restart_speed_control_req)
- idetape_restart_speed_control(drive);
- if (tape->merge_stage_size) {
- if (tape->merge_stage_size >= tape->stage_size) {
+ if (tape->merge_bh_size) {
+ if (tape->merge_bh_size >= tape->buffer_size) {
printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
- tape->merge_stage_size = 0;
+ tape->merge_bh_size = 0;
}
actually_written = min((unsigned int)
- (tape->stage_size - tape->merge_stage_size),
+ (tape->buffer_size - tape->merge_bh_size),
(unsigned int)count);
- if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf,
- actually_written))
+ if (idetape_copy_stage_from_user(tape, buf, actually_written))
ret = -EFAULT;
buf += actually_written;
- tape->merge_stage_size += actually_written;
+ tape->merge_bh_size += actually_written;
count -= actually_written;
- if (tape->merge_stage_size == tape->stage_size) {
+ if (tape->merge_bh_size == tape->buffer_size) {
ssize_t retval;
- tape->merge_stage_size = 0;
+ tape->merge_bh_size = 0;
retval = idetape_add_chrdev_write_request(drive, ctl);
if (retval <= 0)
return (retval);
}
}
- while (count >= tape->stage_size) {
+ while (count >= tape->buffer_size) {
ssize_t retval;
- if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf,
- tape->stage_size))
+ if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
ret = -EFAULT;
- buf += tape->stage_size;
- count -= tape->stage_size;
+ buf += tape->buffer_size;
+ count -= tape->buffer_size;
retval = idetape_add_chrdev_write_request(drive, ctl);
- actually_written += tape->stage_size;
+ actually_written += tape->buffer_size;
if (retval <= 0)
return (retval);
}
if (count) {
actually_written += count;
- if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf,
- count))
+ if (idetape_copy_stage_from_user(tape, buf, count))
ret = -EFAULT;
- tape->merge_stage_size += count;
+ tape->merge_bh_size += count;
}
return ret ? ret : actually_written;
}
*
* Note: MTBSF and MTBSFM are not supported when the tape doesn't support
* spacing over filemarks in the reverse direction. In this case, MTFSFM is also
- * usually not supported (it is supported in the rare case in which we crossed
- * the filemark during our read-ahead pipelined operation mode).
+ * usually not supported.
*
* The following commands are currently not supported:
*
debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
mt_op, mt_count);
- /* Commands which need our pipelined read-ahead stages. */
switch (mt_op) {
case MTFSF:
case MTFSFM:
case MTWEOF:
if (tape->write_prot)
return -EACCES;
- idetape_discard_read_pipeline(drive, 1);
+ ide_tape_discard_merge_buffer(drive, 1);
for (i = 0; i < mt_count; i++) {
retval = idetape_write_filemark(drive);
if (retval)
}
return 0;
case MTREW:
- idetape_discard_read_pipeline(drive, 0);
+ ide_tape_discard_merge_buffer(drive, 0);
if (idetape_rewind_tape(drive))
return -EIO;
return 0;
case MTLOAD:
- idetape_discard_read_pipeline(drive, 0);
+ ide_tape_discard_merge_buffer(drive, 0);
idetape_create_load_unload_cmd(drive, &pc,
IDETAPE_LU_LOAD_MASK);
return idetape_queue_pc_tail(drive, &pc);
if (!idetape_queue_pc_tail(drive, &pc))
tape->door_locked = DOOR_UNLOCKED;
}
- idetape_discard_read_pipeline(drive, 0);
+ ide_tape_discard_merge_buffer(drive, 0);
idetape_create_load_unload_cmd(drive, &pc,
!IDETAPE_LU_LOAD_MASK);
retval = idetape_queue_pc_tail(drive, &pc);
clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags);
return retval;
case MTNOP:
- idetape_discard_read_pipeline(drive, 0);
+ ide_tape_discard_merge_buffer(drive, 0);
return idetape_flush_tape_buffers(drive);
case MTRETEN:
- idetape_discard_read_pipeline(drive, 0);
+ ide_tape_discard_merge_buffer(drive, 0);
idetape_create_load_unload_cmd(drive, &pc,
IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
return idetape_queue_pc_tail(drive, &pc);
set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags);
return 0;
case MTSEEK:
- idetape_discard_read_pipeline(drive, 0);
+ ide_tape_discard_merge_buffer(drive, 0);
return idetape_position_tape(drive,
mt_count * tape->user_bs_factor, tape->partition, 0);
case MTSETPART:
- idetape_discard_read_pipeline(drive, 0);
+ ide_tape_discard_merge_buffer(drive, 0);
return idetape_position_tape(drive, 0, mt_count, 0);
case MTFSR:
case MTBSR:
debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
- tape->restart_speed_control_req = 1;
if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
- idetape_empty_write_pipeline(drive);
+ ide_tape_flush_merge_buffer(drive);
idetape_flush_tape_buffers(drive);
}
if (cmd == MTIOCGET || cmd == MTIOCPOS) {
- block_offset = idetape_pipeline_size(drive) /
+ block_offset = tape->merge_bh_size /
(tape->blk_size * tape->user_bs_factor);
position = idetape_read_position(drive);
if (position < 0)
return 0;
default:
if (tape->chrdev_dir == IDETAPE_DIR_READ)
- idetape_discard_read_pipeline(drive, 1);
+ ide_tape_discard_merge_buffer(drive, 1);
return idetape_blkdev_ioctl(drive, cmd, arg);
}
}
if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags))
(void)idetape_rewind_tape(drive);
- if (tape->chrdev_dir != IDETAPE_DIR_READ)
- clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags);
-
/* Read block size and write protect status from drive. */
ide_tape_get_bsize_from_bdesc(drive);
}
}
}
- idetape_restart_speed_control(drive);
- tape->restart_speed_control_req = 0;
return 0;
out_put_tape:
{
idetape_tape_t *tape = drive->driver_data;
- idetape_empty_write_pipeline(drive);
- tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
- if (tape->merge_stage != NULL) {
+ ide_tape_flush_merge_buffer(drive);
+ tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
+ if (tape->merge_bh != NULL) {
idetape_pad_zeros(drive, tape->blk_size *
(tape->user_bs_factor - 1));
- __idetape_kfree_stage(tape->merge_stage);
- tape->merge_stage = NULL;
+ ide_tape_kfree_buffer(tape);
+ tape->merge_bh = NULL;
}
idetape_write_filemark(drive);
idetape_flush_tape_buffers(drive);
idetape_write_release(drive, minor);
if (tape->chrdev_dir == IDETAPE_DIR_READ) {
if (minor < 128)
- idetape_discard_read_pipeline(drive, 1);
- else
- idetape_wait_for_pipeline(drive);
+ ide_tape_discard_merge_buffer(drive, 1);
}
if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags))
ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
1, 2, (u16 *)&tape->caps[16], NULL);
- ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff,
- tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
- ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff,
- tape->stage_size / 1024, 1, &tape->max_stages, NULL);
- ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff,
- tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
- ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0,
- 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages,
- NULL);
- ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0,
- 0xffff, tape->stage_size / 1024, 1,
- &tape->nr_pending_stages, NULL);
ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
1, 1, (u16 *)&tape->caps[14], NULL);
- ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1,
- 1024, &tape->stage_size, NULL);
+ ide_add_setting(drive, "buffer_size", SETTING_READ, TYPE_INT, 0, 0xffff,
+ 1, 1024, &tape->buffer_size, NULL);
ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN,
IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq,
NULL);
ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1,
1, &drive->dsc_overlap, NULL);
- ide_add_setting(drive, "pipeline_head_speed_c", SETTING_READ, TYPE_INT,
- 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed,
- NULL);
- ide_add_setting(drive, "pipeline_head_speed_u", SETTING_READ, TYPE_INT,
- 0, 0xffff, 1, 1,
- &tape->uncontrolled_pipeline_head_speed, NULL);
ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff,
1, 1, &tape->avg_speed, NULL);
ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
*/
static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
{
- unsigned long t1, tmid, tn, t;
+ unsigned long t;
int speed;
- int stage_size;
+ int buffer_size;
u8 gcw[2];
- struct sysinfo si;
u16 *ctl = (u16 *)&tape->caps[12];
spin_lock_init(&tape->lock);
tape->name[2] = '0' + minor;
tape->chrdev_dir = IDETAPE_DIR_NONE;
tape->pc = tape->pc_stack;
- tape->max_insert_speed = 10000;
- tape->speed_control = 1;
*((unsigned short *) &gcw) = drive->id->config;
/* Command packet DRQ type */
if (((gcw[0] & 0x60) >> 5) == 1)
set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags);
- tape->min_pipeline = 10;
- tape->max_pipeline = 10;
- tape->max_stages = 10;
-
idetape_get_inquiry_results(drive);
idetape_get_mode_sense_results(drive);
ide_tape_get_bsize_from_bdesc(drive);
tape->user_bs_factor = 1;
- tape->stage_size = *ctl * tape->blk_size;
- while (tape->stage_size > 0xffff) {
+ tape->buffer_size = *ctl * tape->blk_size;
+ while (tape->buffer_size > 0xffff) {
printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
*ctl /= 2;
- tape->stage_size = *ctl * tape->blk_size;
+ tape->buffer_size = *ctl * tape->blk_size;
}
- stage_size = tape->stage_size;
- tape->pages_per_stage = stage_size / PAGE_SIZE;
- if (stage_size % PAGE_SIZE) {
- tape->pages_per_stage++;
- tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
+ buffer_size = tape->buffer_size;
+ tape->pages_per_buffer = buffer_size / PAGE_SIZE;
+ if (buffer_size % PAGE_SIZE) {
+ tape->pages_per_buffer++;
+ tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
}
- /* Select the "best" DSC read/write polling freq and pipeline size. */
+ /* select the "best" DSC read/write polling freq */
speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
- tape->max_stages = speed * 1000 * 10 / tape->stage_size;
-
- /* Limit memory use for pipeline to 10% of physical memory */
- si_meminfo(&si);
- if (tape->max_stages * tape->stage_size >
- si.totalram * si.mem_unit / 10)
- tape->max_stages =
- si.totalram * si.mem_unit / (10 * tape->stage_size);
-
- tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
- tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
- tape->max_pipeline =
- min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
- if (tape->max_stages == 0) {
- tape->max_stages = 1;
- tape->min_pipeline = 1;
- tape->max_pipeline = 1;
- }
-
- t1 = (tape->stage_size * HZ) / (speed * 1000);
- tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
- tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
-
- if (tape->max_stages)
- t = tn;
- else
- t = t1;
+ t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
/*
* Ensure that the number we got makes sense; limit it within
* IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
*/
- tape->best_dsc_rw_freq = max_t(unsigned long,
- min_t(unsigned long, t, IDETAPE_DSC_RW_MAX),
- IDETAPE_DSC_RW_MIN);
+ tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
+ IDETAPE_DSC_RW_MAX);
printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
- "%dkB pipeline, %lums tDSC%s\n",
+ "%lums tDSC%s\n",
drive->name, tape->name, *(u16 *)&tape->caps[14],
- (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
- tape->stage_size / 1024,
- tape->max_stages * tape->stage_size / 1024,
+ (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
+ tape->buffer_size / 1024,
tape->best_dsc_rw_freq * 1000 / HZ,
drive->using_dma ? ", DMA":"");
ide_drive_t *drive = tape->drive;
struct gendisk *g = tape->disk;
- BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
+ BUG_ON(tape->merge_bh_size);
drive->dsc_overlap = 0;
drive->driver_data = NULL;
git.openpandora.org / pandora-kernel.git / blobdiff