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ide-cd: merge cdrom_rw_intr() and cdrom_newpc_intr() 

Add handling of fs read/write requests to cdrom_nepwc_intr()
and remove no longer needed cdrom_rw_intr().

There should be no functionality changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-02-01 23:09:28 +01:00
parent 48ea0b216b
commit 0041e7c6ca
1 changed files with 94 additions and 178 deletions
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272
drivers/ide/ide-cd.c
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@ -797,7 +797,7 @@ static int cdrom_read_from_buffer (ide_drive_t *drive)
return 0;
}
static ide_startstop_t cdrom_rw_intr(ide_drive_t *);
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *);
/*
* Routine to send a read/write packet command to the drive.
@ -846,7 +846,7 @@ static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive)
rq->timeout = ATAPI_WAIT_PC;
/* Send the command to the drive and return. */
return cdrom_transfer_packet_command(drive, rq, cdrom_rw_intr);
return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
}
#define IDECD_SEEK_THRESHOLD (1000) /* 1000 blocks */
@ -1024,17 +1024,12 @@ static int cdrom_newpc_intr_dummy_cb(struct request *rq)
return 1;
}
/*
* best way to deal with dma that is not sector aligned right now... note
* that in this path we are not using ->data or ->buffer at all. this irs
* can replace cdrom_rw_intr() in the future.
*/
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
{
struct cdrom_info *info = drive->driver_data;
struct request *rq = HWGROUP(drive)->rq;
xfer_func_t *xferfunc;
ide_expiry_t *expiry;
ide_expiry_t *expiry = NULL;
int dma_error = 0, dma, stat, ireason, len, thislen, uptodate = 0;
int write = (rq_data_dir(rq) == WRITE) ? 1 : 0;
unsigned int timeout;
@ -1061,6 +1056,10 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
if (dma) {
if (dma_error)
return ide_error(drive, "dma error", stat);
if (blk_fs_request(rq)) {
ide_end_request(drive, 1, rq->nr_sectors);
return ide_stopped;
}
goto end_request;
}
@ -1072,7 +1071,8 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
highcyl = HWIF(drive)->INB(IDE_BCOUNTH_REG);
len = lowcyl + (256 * highcyl);
thislen = rq->data_len;
thislen = blk_fs_request(rq) ? len : rq->data_len;
if (thislen > len)
thislen = len;
@ -1080,7 +1080,24 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
* If DRQ is clear, the command has completed.
*/
if ((stat & DRQ_STAT) == 0) {
if (!blk_pc_request(rq)) {
if (blk_fs_request(rq)) {
/*
* If we're not done reading/writing, complain.
* Otherwise, complete the command normally.
*/
uptodate = 1;
if (rq->current_nr_sectors > 0) {
printk(KERN_ERR "%s: %s: data underrun "
"(%d blocks)\n",
drive->name, __FUNCTION__,
rq->current_nr_sectors);
if (!write)
rq->cmd_flags |= REQ_FAILED;
uptodate = 0;
}
cdrom_end_request(drive, uptodate);
return ide_stopped;
} else if (!blk_pc_request(rq)) {
ide_cd_request_sense_fixup(rq);
/* Complain if we still have data left to transfer. */
uptodate = rq->data_len ? 0 : 1;
@ -1091,24 +1108,47 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
/*
* check which way to transfer data
*/
if (blk_pc_request(rq) && rq_data_dir(rq) == WRITE) {
if ((blk_fs_request(rq) || blk_pc_request(rq)) && write) {
/*
* write to drive
*/
if (cdrom_write_check_ireason(drive, len, ireason))
return ide_stopped;
} else if (blk_pc_request(rq)) {
} else if (blk_fs_request(rq) || blk_pc_request(rq)) {
/*
* read from drive
*/
if (cdrom_read_check_ireason(drive, len, ireason))
return ide_stopped;
if (blk_fs_request(rq)) {
int nskip;
if (ide_cd_check_transfer_size(drive, len)) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
/*
* First, figure out if we need to bit-bucket
* any of the leading sectors.
*/
nskip = min_t(int, rq->current_nr_sectors
- bio_cur_sectors(rq->bio),
thislen >> 9);
if (nskip > 0) {
ide_cd_drain_data(drive, nskip);
rq->current_nr_sectors -= nskip;
thislen -= (nskip << 9);
}
}
}
if (ireason == 0) {
write = 1;
xferfunc = HWIF(drive)->atapi_output_bytes;
} else if (ireason == 2 || (ireason == 1 && blk_pc_request(rq))) {
} else if (ireason == 2 || (ireason == 1 &&
(blk_fs_request(rq) || blk_pc_request(rq)))) {
write = 0;
xferfunc = HWIF(drive)->atapi_input_bytes;
} else {
@ -1123,23 +1163,37 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
* transfer data
*/
while (thislen > 0) {
u8 *ptr = rq->data;
u8 *ptr = blk_fs_request(rq) ? NULL : rq->data;
int blen = rq->data_len;
/*
* bio backed?
*/
if (rq->bio) {
ptr = bio_data(rq->bio);
blen = bio_iovec(rq->bio)->bv_len;
if (blk_fs_request(rq)) {
ptr = rq->buffer;
blen = rq->current_nr_sectors << 9;
} else {
ptr = bio_data(rq->bio);
blen = bio_iovec(rq->bio)->bv_len;
}
}
if (!ptr) {
printk(KERN_ERR "%s: confused, missing data\n",
drive->name);
blk_dump_rq_flags(rq, rq_data_dir(rq)
? "cdrom_newpc_intr, write"
: "cdrom_newpc_intr, read");
if (blk_fs_request(rq) && !write)
/*
* If the buffers are full, cache the rest
* of the data in our internal buffer.
*/
cdrom_buffer_sectors(drive, rq->sector,
thislen >> 9);
else {
printk(KERN_ERR "%s: confused, missing data\n",
drive->name);
blk_dump_rq_flags(rq, rq_data_dir(rq)
? "cdrom_newpc_intr, write"
: "cdrom_newpc_intr, read");
}
break;
}
@ -1150,19 +1204,30 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
thislen -= blen;
len -= blen;
rq->data_len -= blen;
if (rq->bio)
if (blk_fs_request(rq)) {
rq->buffer += blen;
rq->nr_sectors -= (blen >> 9);
rq->current_nr_sectors -= (blen >> 9);
rq->sector += (blen >> 9);
if (rq->current_nr_sectors == 0 && rq->nr_sectors)
cdrom_end_request(drive, 1);
} else {
rq->data_len -= blen;
/*
* The request can't be completed until DRQ is cleared.
* So complete the data, but don't complete the request
* using the dummy function for the callback feature
* of blk_end_request_callback().
*/
blk_end_request_callback(rq, 0, blen,
if (rq->bio)
blk_end_request_callback(rq, 0, blen,
cdrom_newpc_intr_dummy_cb);
else
rq->data += blen;
else
rq->data += blen;
}
}
if (write && blk_sense_request(rq))
@ -1171,15 +1236,15 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
/*
* pad, if necessary
*/
if (len > 0)
if (!blk_fs_request(rq) && len > 0)
ide_cd_pad_transfer(drive, xferfunc, len);
if (blk_pc_request(rq)) {
timeout = rq->timeout;
expiry = NULL;
} else {
timeout = ATAPI_WAIT_PC;
expiry = cdrom_timer_expiry;
if (!blk_fs_request(rq))
expiry = cdrom_timer_expiry;
}
ide_set_handler(drive, cdrom_newpc_intr, timeout, expiry);
@ -1202,155 +1267,6 @@ end_request:
return ide_stopped;
}
static ide_startstop_t cdrom_rw_intr(ide_drive_t *drive)
{
struct cdrom_info *info = drive->driver_data;
struct request *rq = HWGROUP(drive)->rq;
xfer_func_t *xferfunc;
int stat, ireason, len, thislen, uptodate, nskip;
int dma_error = 0, dma = info->dma, write = rq_data_dir(rq) == WRITE;
u8 lowcyl = 0, highcyl = 0;
/* Check for errors. */
if (dma) {
info->dma = 0;
dma_error = HWIF(drive)->ide_dma_end(drive);
if (dma_error) {
printk(KERN_ERR "%s: DMA %s error\n", drive->name,
write ? "write" : "read");
ide_dma_off(drive);
}
}
if (cdrom_decode_status(drive, 0, &stat))
return ide_stopped;
/*
* using dma, transfer is complete now
*/
if (dma) {
if (dma_error)
return ide_error(drive, "dma error", stat);
ide_end_request(drive, 1, rq->nr_sectors);
return ide_stopped;
}
/* Read the interrupt reason and the transfer length. */
ireason = HWIF(drive)->INB(IDE_IREASON_REG) & 0x3;
lowcyl = HWIF(drive)->INB(IDE_BCOUNTL_REG);
highcyl = HWIF(drive)->INB(IDE_BCOUNTH_REG);
len = lowcyl + (256 * highcyl);
/* If DRQ is clear, the command has completed. */
if ((stat & DRQ_STAT) == 0) {
/*
* If we're not done reading/writing, complain.
* Otherwise, complete the command normally.
*/
uptodate = 1;
if (rq->current_nr_sectors > 0) {
printk(KERN_ERR "%s: %s: data underrun (%d blocks)\n",
drive->name, __FUNCTION__,
rq->current_nr_sectors);
if (!write)
rq->cmd_flags |= REQ_FAILED;
uptodate = 0;
}
cdrom_end_request(drive, uptodate);
return ide_stopped;
}
thislen = len;
/* Check that the drive is expecting to do the same thing we are. */
if (write) {
if (cdrom_write_check_ireason(drive, len, ireason))
return ide_stopped;
xferfunc = HWIF(drive)->atapi_output_bytes;
} else {
if (cdrom_read_check_ireason(drive, len, ireason))
return ide_stopped;
if (ide_cd_check_transfer_size(drive, len)) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
/*
* First, figure out if we need to bit-bucket
* any of the leading sectors.
*/
nskip = min_t(int, rq->current_nr_sectors
- bio_cur_sectors(rq->bio),
thislen >> 9);
if (nskip > 0) {
ide_cd_drain_data(drive, nskip);
rq->current_nr_sectors -= nskip;
thislen -= (nskip << 9);
}
xferfunc = HWIF(drive)->atapi_input_bytes;
}
/*
* now loop and read/write the data
*/
while (thislen > 0) {
u8 *ptr = NULL;
int blen;
if (rq->bio) {
ptr = rq->buffer;
blen = rq->current_nr_sectors << 9;
}
if (!ptr) {
if (!write)
/*
* If the buffers are full, cache the rest
* of the data in our internal buffer.
*/
cdrom_buffer_sectors(drive, rq->sector,
thislen >> 9);
else {
printk(KERN_ERR "%s: %s: confused, missing "
"data\n",
drive->name, __FUNCTION__);
blk_dump_rq_flags(rq, "cdrom_rw_intr, write");
}
break;
}
/*
* Figure out how many sectors we can transfer
*/
if (blen > thislen)
blen = thislen;
xferfunc(drive, ptr, blen);
thislen -= blen;
rq->buffer += blen;
rq->nr_sectors -= (blen >> 9);
rq->current_nr_sectors -= (blen >> 9);
rq->sector += (blen >> 9);
/*
* current buffer complete, move on
*/
if (rq->current_nr_sectors == 0 && rq->nr_sectors)
cdrom_end_request(drive, 1);
}
/* re-arm handler */
ide_set_handler(drive, cdrom_rw_intr, ATAPI_WAIT_PC, NULL);
return ide_started;
}
static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
{
struct cdrom_info *cd = drive->driver_data;