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SubjectRe: [PATCH] make ide-cd handle non-2kB sector sizes
On Fri, 23 Jan 2004, Jens Axboe wrote:

> Yes that's precisely what I mean, there's no need to keep the same info
> in several places.

Here's an updated patch. It doesn't work yet, though, and I can't figure
out why.

With this patch applied, I can successfully use a 512 byte sector disc.
However, then inserting a 2048 byte sector disk and trying to fsck it,
I get a dozen of:

hde: command error: status=0x51 { DriveReady SeekComplete Error }
hde: command error: error=0x70
end_request: I/O error, dev hde, sector 196608
Buffer I/O error on device hde, logical block 24576
lost page write due to I/O error on hde
Notice how the sector and logical sector numbers are different by a
factor of 8. Shouldn't this be a factor of 4?

I don't see why this behaves differently than my previous patch, which
shows no such problem.

Comments?


--- linux-2.6.2-rc1/drivers/ide/ide-cd.c.orig Thu Jan 22 18:04:59 2004
+++ linux-2.6.2-rc1/drivers/ide/ide-cd.c Fri Jan 23 19:34:02 2004
@@ -294,10 +294,12 @@
* 4.60 Dec 17, 2003 - Add mt rainier support
* - Bump timeout for packet commands, matches sr
* - Odd stuff
+ * 4.61 Jan 22, 2004 - support hardware sector sizes other than 2kB,
+ * Pascal Schmidt <der.eremit@email.de>
*
*************************************************************************/

-#define IDECD_VERSION "4.60"
+#define IDECD_VERSION "4.61"

#include <linux/config.h>
#include <linux/module.h>
@@ -1211,6 +1213,7 @@ static int cdrom_read_from_buffer (ide_d
{
struct cdrom_info *info = drive->driver_data;
struct request *rq = HWGROUP(drive)->rq;
+ unsigned short sectors_per_frame = queue_hardsect_size(rq->q) >> 9;

/* Can't do anything if there's no buffer. */
if (info->buffer == NULL) return 0;
@@ -1249,7 +1252,7 @@ static int cdrom_read_from_buffer (ide_d
will fail. I think that this will never happen, but let's be
paranoid and check. */
if (rq->current_nr_sectors < bio_cur_sectors(rq->bio) &&
- (rq->sector % SECTORS_PER_FRAME) != 0) {
+ (rq->sector % sectors_per_frame) != 0) {
printk("%s: cdrom_read_from_buffer: buffer botch (%ld)\n",
drive->name, (long)rq->sector);
cdrom_end_request(drive, 0);
@@ -1268,13 +1271,8 @@ static int cdrom_read_from_buffer (ide_d
static ide_startstop_t cdrom_start_read_continuation (ide_drive_t *drive)
{
struct request *rq = HWGROUP(drive)->rq;
- int nsect, sector, nframes, frame, nskip;
-
- /* Number of sectors to transfer. */
- nsect = rq->nr_sectors;
-
- /* Starting sector. */
- sector = rq->sector;
+ unsigned short sectors_per_frame = queue_hardsect_size(rq->q) >> 9;
+ int nskip;

/* If the requested sector doesn't start on a cdrom block boundary,
we must adjust the start of the transfer so that it does,
@@ -1283,31 +1281,19 @@ static ide_startstop_t cdrom_start_read_
of the buffer, it will mean that we're to skip a number
of sectors equal to the amount by which CURRENT_NR_SECTORS
is larger than the buffer size. */
- nskip = (sector % SECTORS_PER_FRAME);
+ nskip = (rq->sector % sectors_per_frame);
if (nskip > 0) {
/* Sanity check... */
if (rq->current_nr_sectors != bio_cur_sectors(rq->bio) &&
- (rq->sector % CD_FRAMESIZE != 0)) {
+ (rq->sector % sectors_per_frame != 0)) {
printk ("%s: cdrom_start_read_continuation: buffer botch (%u)\n",
drive->name, rq->current_nr_sectors);
cdrom_end_request(drive, 0);
return ide_stopped;
}
- sector -= nskip;
- nsect += nskip;
rq->current_nr_sectors += nskip;
}

- /* Convert from sectors to cdrom blocks, rounding up the transfer
- length if needed. */
- nframes = (nsect + SECTORS_PER_FRAME-1) / SECTORS_PER_FRAME;
- frame = sector / SECTORS_PER_FRAME;
-
- /* Largest number of frames was can transfer at once is 64k-1. For
- some drives we need to limit this even more. */
- nframes = MIN (nframes, (CDROM_CONFIG_FLAGS (drive)->limit_nframes) ?
- (65534 / CD_FRAMESIZE) : 65535);
-
/* Set up the command */
rq->timeout = ATAPI_WAIT_PC;

@@ -1346,13 +1332,10 @@ static ide_startstop_t cdrom_seek_intr (
static ide_startstop_t cdrom_start_seek_continuation (ide_drive_t *drive)
{
struct request *rq = HWGROUP(drive)->rq;
- int sector, frame, nskip;
+ unsigned short sectors_per_frame = queue_hardsect_size(rq->q) >> 9;
+ int frame;

- sector = rq->sector;
- nskip = (sector % SECTORS_PER_FRAME);
- if (nskip > 0)
- sector -= nskip;
- frame = sector / SECTORS_PER_FRAME;
+ frame = rq->sector / sectors_per_frame;

memset(rq->cmd, 0, sizeof(rq->cmd));
rq->cmd[0] = GPCMD_SEEK;
@@ -1396,6 +1379,7 @@ static ide_startstop_t cdrom_start_read
{
struct cdrom_info *info = drive->driver_data;
struct request *rq = HWGROUP(drive)->rq;
+ unsigned short sectors_per_frame = queue_hardsect_size(rq->q) >> 9;

/* We may be retrying this request after an error. Fix up
any weirdness which might be present in the request packet. */
@@ -1411,8 +1395,8 @@ static ide_startstop_t cdrom_start_read
info->nsectors_buffered = 0;

/* use dma, if possible. */
- if (drive->using_dma && (rq->sector % SECTORS_PER_FRAME == 0) &&
- (rq->nr_sectors % SECTORS_PER_FRAME == 0))
+ if (drive->using_dma && (rq->sector % sectors_per_frame == 0) &&
+ (rq->nr_sectors % sectors_per_frame == 0))
info->dma = 1;
else
info->dma = 0;
@@ -1950,11 +1934,13 @@ static ide_startstop_t cdrom_start_write
static ide_startstop_t cdrom_start_write(ide_drive_t *drive, struct request *rq)
{
struct cdrom_info *info = drive->driver_data;
+ unsigned short sectors_per_frame = queue_hardsect_size(rq->q) >> 9;

/*
- * writes *must* be 2kB frame aligned
+ * writes *must* be hardware frame aligned
*/
- if ((rq->nr_sectors & 3) || (rq->sector & 3)) {
+ if (rq->nr_sectors % sectors_per_frame != 0 ||
+ rq->sector % sectors_per_frame != 0) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
@@ -1969,12 +1955,12 @@ static ide_startstop_t cdrom_start_write

info->nsectors_buffered = 0;

- /* use dma, if possible. we don't need to check more, since we
- * know that the transfer is always (at least!) 2KB aligned */
+ /* use dma, if possible. we don't need to check more, since we
+ * know that the transfer is always (at least!) frame aligned */
info->dma = drive->using_dma ? 1 : 0;
info->cmd = WRITE;

- /* Start sending the read request to the drive. */
+ /* Start sending the write request to the drive. */
return cdrom_start_packet_command(drive, 32768, cdrom_start_write_cont);
}

@@ -2209,6 +2195,7 @@ static int cdrom_eject(ide_drive_t *driv
}

static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
+ unsigned long *sectors_per_frame,
struct request_sense *sense)
{
struct {
@@ -2227,8 +2214,10 @@ static int cdrom_read_capacity(ide_drive
req.data_len = sizeof(capbuf);

stat = cdrom_queue_packet_command(drive, &req);
- if (stat == 0)
+ if (stat == 0) {
*capacity = 1 + be32_to_cpu(capbuf.lba);
+ *sectors_per_frame = be32_to_cpu(capbuf.blocklen) >> 9;
+ }

return stat;
}
@@ -2270,6 +2259,7 @@ static int cdrom_read_toc(ide_drive_t *d
struct atapi_toc_entry ent;
} ms_tmp;
long last_written;
+ unsigned long sectors_per_frame = SECTORS_PER_FRAME;

if (toc == NULL) {
/* Try to allocate space. */
@@ -2289,12 +2279,14 @@ static int cdrom_read_toc(ide_drive_t *d
if (CDROM_STATE_FLAGS(drive)->toc_valid)
return 0;

- /* Try to get the total cdrom capacity. */
- stat = cdrom_read_capacity(drive, &toc->capacity, sense);
+ /* Try to get the total cdrom capacity and sector size. */
+ stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
+ sense);
if (stat)
toc->capacity = 0x1fffff;

- set_capacity(drive->disk, toc->capacity * SECTORS_PER_FRAME);
+ set_capacity(drive->disk, toc->capacity * sectors_per_frame);
+ blk_queue_hardsect_size(drive->queue, sectors_per_frame << 9);

/* First read just the header, so we know how long the TOC is. */
stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
@@ -2406,7 +2398,7 @@ static int cdrom_read_toc(ide_drive_t *d
stat = cdrom_get_last_written(cdi, &last_written);
if (!stat && last_written) {
toc->capacity = last_written;
- set_capacity(drive->disk, toc->capacity * SECTORS_PER_FRAME);
+ set_capacity(drive->disk, toc->capacity * sectors_per_frame);
}

/* Remember that we've read this stuff. */
@@ -3306,12 +3298,12 @@ int ide_cdrom_setup (ide_drive_t *drive)
static
sector_t ide_cdrom_capacity (ide_drive_t *drive)
{
- unsigned long capacity;
+ unsigned long capacity, sectors_per_frame;

- if (cdrom_read_capacity(drive, &capacity, NULL))
+ if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame, NULL))
return 0;

- return capacity * SECTORS_PER_FRAME;
+ return capacity * sectors_per_frame;
}

static

--
Ciao,
Pascal

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