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 */
*/
/* 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. */
- int pages_per_stage;
+ int pages_per_buffer;
/* Wasted space in each stage */
int excess_bh_size;
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;
}
}
-/* Free a stage along with its related buffers completely. */
-static void __idetape_kfree_stage(idetape_stage_t *stage)
+/* Free data buffers completely. */
+static void ide_tape_kfree_buffer(idetape_tape_t *tape)
{
- struct idetape_bh *prev_bh, *bh = stage->bh;
- int size;
+ struct idetape_bh *prev_bh, *bh = tape->merge_bh;
- 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;
- }
+ while (bh) {
+ u32 size = bh->b_size;
+
+ while (size) {
+ unsigned int order = fls(size >> PAGE_SHIFT)-1;
+
+ 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);
+ 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;
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;
}
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;
}
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->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;
}
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;
}
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 {
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;
if (tape->chrdev_dir != IDETAPE_DIR_READ)
- return 0;
+ return;
clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags);
- tape->merge_stage_size = 0;
- if (tape->merge_stage != NULL) {
- __idetape_kfree_stage(tape->merge_stage);
- tape->merge_stage = NULL;
+ tape->merge_bh_size = 0;
+ if (tape->merge_bh != NULL) {
+ ide_tape_kfree_buffer(tape);
+ tape->merge_bh = NULL;
}
tape->chrdev_dir = IDETAPE_DIR_NONE;
-
- return 0;
}
/*
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;
}
}
if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
return 0;
- if (tape->merge_stage)
- idetape_init_merge_stage(tape);
+ if (tape->merge_bh)
+ idetape_init_merge_buffer(tape);
if (rq.errors == IDETAPE_ERROR_GENERAL)
return -EIO;
return (tape->blk_size * (blocks-rq.current_nr_sectors));
debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
- blocks, tape->merge_stage->bh);
+ blocks, tape->merge_bh);
}
-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;
}
- 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;
}
tape->chrdev_dir = IDETAPE_DIR_NONE;
}
/* 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;
}
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;
idetape_init_read(drive);
return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
- tape->merge_stage->bh);
+ 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);
}
}
}
if (tape->chrdev_dir == IDETAPE_DIR_READ) {
- tape->merge_stage_size = 0;
+ tape->merge_bh_size = 0;
if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
++count;
- 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:
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, 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, 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->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, 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, 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);
}
actually_written += 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);
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 = tape->merge_stage_size /
+ 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);
}
}
{
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);
+ ide_tape_discard_merge_buffer(drive, 1);
}
if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags))
1, 2, (u16 *)&tape->caps[16], 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);
{
unsigned long t;
int speed;
- int stage_size;
+ int buffer_size;
u8 gcw[2];
u16 *ctl = (u16 *)&tape->caps[12];
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 */
speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
- t = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
+ t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
/*
* Ensure that the number we got makes sense; limit it within
printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
"%lums tDSC%s\n",
drive->name, tape->name, *(u16 *)&tape->caps[14],
- (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
- 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->merge_stage_size);
+ BUG_ON(tape->merge_bh_size);
drive->dsc_overlap = 0;
drive->driver_data = NULL;
projects / linux-2.6-omap-h63xx.git / blobdiff