On Tue, Jan 30, 2007 at 08:53:19PM +0100, Luca Tettamanti wrote:
> Hi,
> pktcdvd on kernel 2.6.20-rc6 is not working as expected. Any file that
> is written to the device is lost after umount.
> I rarely use pktcdvd but at some point it used to work on my system.
>
> This is what I'm doing:
>
> root@dreamland:/tmp# cdrwtool -d /dev/scd0 -q
> using device /dev/scd0
> 1029KB internal buffer
> setting write speed to 12x
> Settings for /dev/scd0:
> Fixed packets, size 32
> Mode-2 disc
>...
Does 2.6.20-rc7 work?
If no, does it work after applying the attached patch?
If no, does 2.6.19.2 work?
> Luca
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 6246219..7c95c76 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -765,34 +765,47 @@ static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio
*/
static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
{
- request_queue_t *q = bdev_get_queue(pd->bdev);
+ char sense[SCSI_SENSE_BUFFERSIZE];
+ request_queue_t *q;
struct request *rq;
- int ret = 0;
-
- rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
- WRITE : READ, __GFP_WAIT);
-
- if (cgc->buflen) {
- if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT))
- goto out;
- }
+ DECLARE_COMPLETION_ONSTACK(wait);
+ int err = 0;
- rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
- memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
- if (sizeof(rq->cmd) > CDROM_PACKET_SIZE)
- memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE);
+ q = bdev_get_queue(pd->bdev);
+ rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? WRITE : READ,
+ __GFP_WAIT);
+ rq->errors = 0;
+ rq->rq_disk = pd->bdev->bd_disk;
+ rq->bio = NULL;
+ rq->buffer = NULL;
rq->timeout = 60*HZ;
+ rq->data = cgc->buffer;
+ rq->data_len = cgc->buflen;
+ rq->sense = sense;
+ memset(sense, 0, sizeof(sense));
+ rq->sense_len = 0;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->cmd_flags |= REQ_HARDBARRIER;
if (cgc->quiet)
rq->cmd_flags |= REQ_QUIET;
+ memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
+ if (sizeof(rq->cmd) > CDROM_PACKET_SIZE)
+ memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE);
+ rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
+
+ rq->ref_count++;
+ rq->end_io_data = &wait;
+ rq->end_io = blk_end_sync_rq;
+ elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1);
+ generic_unplug_device(q);
+ wait_for_completion(&wait);
+
+ if (rq->errors)
+ err = -EIO;
- blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
- ret = rq->errors;
-out:
blk_put_request(rq);
- return ret;
+ return err;
}
/*
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index f02f48a..6fe1e82 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -998,14 +998,25 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
int count;
/*
- * We used to not use scatter-gather for single segment request,
+ * if this is a rq->data based REQ_BLOCK_PC, setup for a non-sg xfer
+ */
+ if (blk_pc_request(req) && !req->bio) {
+ cmd->request_bufflen = req->data_len;
+ cmd->request_buffer = req->data;
+ req->buffer = req->data;
+ cmd->use_sg = 0;
+ return 0;
+ }
+
+ /*
+ * we used to not use scatter-gather for single segment request,
* but now we do (it makes highmem I/O easier to support without
* kmapping pages)
*/
cmd->use_sg = req->nr_phys_segments;
/*
- * If sg table allocation fails, requeue request later.
+ * if sg table allocation fails, requeue request later.
*/
sgpnt = scsi_alloc_sgtable(cmd, GFP_ATOMIC);
if (unlikely(!sgpnt)) {
@@ -1013,21 +1024,24 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
return BLKPREP_DEFER;
}
- req->buffer = NULL;
cmd->request_buffer = (char *) sgpnt;
+ cmd->request_bufflen = req->nr_sectors << 9;
if (blk_pc_request(req))
cmd->request_bufflen = req->data_len;
- else
- cmd->request_bufflen = req->nr_sectors << 9;
+ req->buffer = NULL;
/*
* Next, walk the list, and fill in the addresses and sizes of
* each segment.
*/
count = blk_rq_map_sg(req->q, req, cmd->request_buffer);
+
+ /*
+ * mapped well, send it off
+ */
if (likely(count <= cmd->use_sg)) {
cmd->use_sg = count;
- return BLKPREP_OK;
+ return 0;
}
printk(KERN_ERR "Incorrect number of segments after building list\n");
@@ -1057,27 +1071,6 @@ static int scsi_issue_flush_fn(request_queue_t *q, struct gendisk *disk,
return -EOPNOTSUPP;
}
-static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
- struct request *req)
-{
- struct scsi_cmnd *cmd;
-
- if (!req->special) {
- cmd = scsi_get_command(sdev, GFP_ATOMIC);
- if (unlikely(!cmd))
- return NULL;
- req->special = cmd;
- } else {
- cmd = req->special;
- }
-
- /* pull a tag out of the request if we have one */
- cmd->tag = req->tag;
- cmd->request = req;
-
- return cmd;
-}
-
static void scsi_blk_pc_done(struct scsi_cmnd *cmd)
{
BUG_ON(!blk_pc_request(cmd->request));
@@ -1090,37 +1083,9 @@ static void scsi_blk_pc_done(struct scsi_cmnd *cmd)
scsi_io_completion(cmd, cmd->request_bufflen);
}
-static int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
+static void scsi_setup_blk_pc_cmnd(struct scsi_cmnd *cmd)
{
- struct scsi_cmnd *cmd;
-
- cmd = scsi_get_cmd_from_req(sdev, req);
- if (unlikely(!cmd))
- return BLKPREP_DEFER;
-
- /*
- * BLOCK_PC requests may transfer data, in which case they must
- * a bio attached to them. Or they might contain a SCSI command
- * that does not transfer data, in which case they may optionally
- * submit a request without an attached bio.
- */
- if (req->bio) {
- int ret;
-
- BUG_ON(!req->nr_phys_segments);
-
- ret = scsi_init_io(cmd);
- if (unlikely(ret))
- return ret;
- } else {
- BUG_ON(req->data_len);
- BUG_ON(req->data);
-
- cmd->request_bufflen = 0;
- cmd->request_buffer = NULL;
- cmd->use_sg = 0;
- req->buffer = NULL;
- }
+ struct request *req = cmd->request;
BUILD_BUG_ON(sizeof(req->cmd) > sizeof(cmd->cmnd));
memcpy(cmd->cmnd, req->cmd, sizeof(cmd->cmnd));
@@ -1136,138 +1101,154 @@ static int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
cmd->allowed = req->retries;
cmd->timeout_per_command = req->timeout;
cmd->done = scsi_blk_pc_done;
- return BLKPREP_OK;
-}
-
-/*
- * Setup a REQ_TYPE_FS command. These are simple read/write request
- * from filesystems that still need to be translated to SCSI CDBs from
- * the ULD.
- */
-static int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
-{
- struct scsi_cmnd *cmd;
- struct scsi_driver *drv;
- int ret;
-
- /*
- * Filesystem requests must transfer data.
- */
- BUG_ON(!req->nr_phys_segments);
-
- cmd = scsi_get_cmd_from_req(sdev, req);
- if (unlikely(!cmd))
- return BLKPREP_DEFER;
-
- ret = scsi_init_io(cmd);
- if (unlikely(ret))
- return ret;
-
- /*
- * Initialize the actual SCSI command for this request.
- */
- drv = *(struct scsi_driver **)req->rq_disk->private_data;
- if (unlikely(!drv->init_command(cmd))) {
- scsi_release_buffers(cmd);
- scsi_put_command(cmd);
- return BLKPREP_KILL;
- }
-
- return BLKPREP_OK;
}
static int scsi_prep_fn(struct request_queue *q, struct request *req)
{
struct scsi_device *sdev = q->queuedata;
- int ret = BLKPREP_OK;
+ struct scsi_cmnd *cmd;
+ int specials_only = 0;
/*
- * If the device is not in running state we will reject some
- * or all commands.
+ * Just check to see if the device is online. If it isn't, we
+ * refuse to process any commands. The device must be brought
+ * online before trying any recovery commands
*/
+ if (unlikely(!scsi_device_online(sdev))) {
+ sdev_printk(KERN_ERR, sdev,
+ "rejecting I/O to offline device\n");
+ goto kill;
+ }
if (unlikely(sdev->sdev_state != SDEV_RUNNING)) {
- switch (sdev->sdev_state) {
- case SDEV_OFFLINE:
- /*
- * If the device is offline we refuse to process any
- * commands. The device must be brought online
- * before trying any recovery commands.
- */
- sdev_printk(KERN_ERR, sdev,
- "rejecting I/O to offline device\n");
- ret = BLKPREP_KILL;
- break;
- case SDEV_DEL:
- /*
- * If the device is fully deleted, we refuse to
- * process any commands as well.
- */
+ /* OK, we're not in a running state don't prep
+ * user commands */
+ if (sdev->sdev_state == SDEV_DEL) {
+ /* Device is fully deleted, no commands
+ * at all allowed down */
sdev_printk(KERN_ERR, sdev,
"rejecting I/O to dead device\n");
- ret = BLKPREP_KILL;
- break;
- case SDEV_QUIESCE:
- case SDEV_BLOCK:
- /*
- * If the devices is blocked we defer normal commands.
- */
- if (!(req->cmd_flags & REQ_PREEMPT))
- ret = BLKPREP_DEFER;
- break;
- default:
- /*
- * For any other not fully online state we only allow
- * special commands. In particular any user initiated
- * command is not allowed.
- */
- if (!(req->cmd_flags & REQ_PREEMPT))
- ret = BLKPREP_KILL;
- break;
+ goto kill;
}
-
- if (ret != BLKPREP_OK)
- goto out;
+ /* OK, we only allow special commands (i.e. not
+ * user initiated ones */
+ specials_only = sdev->sdev_state;
}
- switch (req->cmd_type) {
- case REQ_TYPE_BLOCK_PC:
- ret = scsi_setup_blk_pc_cmnd(sdev, req);
- break;
- case REQ_TYPE_FS:
- ret = scsi_setup_fs_cmnd(sdev, req);
- break;
- default:
+ /*
+ * Find the actual device driver associated with this command.
+ * The SPECIAL requests are things like character device or
+ * ioctls, which did not originate from ll_rw_blk. Note that
+ * the special field is also used to indicate the cmd for
+ * the remainder of a partially fulfilled request that can
+ * come up when there is a medium error. We have to treat
+ * these two cases differently. We differentiate by looking
+ * at request->cmd, as this tells us the real story.
+ */
+ if (blk_special_request(req) && req->special)
+ cmd = req->special;
+ else if (blk_pc_request(req) || blk_fs_request(req)) {
+ if (unlikely(specials_only) && !(req->cmd_flags & REQ_PREEMPT)){
+ if (specials_only == SDEV_QUIESCE ||
+ specials_only == SDEV_BLOCK)
+ goto defer;
+
+ sdev_printk(KERN_ERR, sdev,
+ "rejecting I/O to device being removed\n");
+ goto kill;
+ }
+
/*
- * All other command types are not supported.
- *
- * Note that these days the SCSI subsystem does not use
- * REQ_TYPE_SPECIAL requests anymore. These are only used
- * (directly or via blk_insert_request) by non-SCSI drivers.
+ * Now try and find a command block that we can use.
*/
+ if (!req->special) {
+ cmd = scsi_get_command(sdev, GFP_ATOMIC);
+ if (unlikely(!cmd))
+ goto defer;
+ } else
+ cmd = req->special;
+
+ /* pull a tag out of the request if we have one */
+ cmd->tag = req->tag;
+ } else {
blk_dump_rq_flags(req, "SCSI bad req");
- ret = BLKPREP_KILL;
- break;
+ goto kill;
}
+
+ /* note the overloading of req->special. When the tag
+ * is active it always means cmd. If the tag goes
+ * back for re-queueing, it may be reset */
+ req->special = cmd;
+ cmd->request = req;
+
+ /*
+ * FIXME: drop the lock here because the functions below
+ * expect to be called without the queue lock held. Also,
+ * previously, we dequeued the request before dropping the
+ * lock. We hope REQ_STARTED prevents anything untoward from
+ * happening now.
+ */
+ if (blk_fs_request(req) || blk_pc_request(req)) {
+ int ret;
- out:
- switch (ret) {
- case BLKPREP_KILL:
- req->errors = DID_NO_CONNECT << 16;
- break;
- case BLKPREP_DEFER:
/*
- * If we defer, the elv_next_request() returns NULL, but the
- * queue must be restarted, so we plug here if no returning
- * command will automatically do that.
+ * This will do a couple of things:
+ * 1) Fill in the actual SCSI command.
+ * 2) Fill in any other upper-level specific fields
+ * (timeout).
+ *
+ * If this returns 0, it means that the request failed
+ * (reading past end of disk, reading offline device,
+ * etc). This won't actually talk to the device, but
+ * some kinds of consistency checking may cause the
+ * request to be rejected immediately.
*/
- if (sdev->device_busy == 0)
- blk_plug_device(q);
- break;
- default:
- req->cmd_flags |= REQ_DONTPREP;
+
+ /*
+ * This sets up the scatter-gather table (allocating if
+ * required).
+ */
+ ret = scsi_init_io(cmd);
+ switch(ret) {
+ /* For BLKPREP_KILL/DEFER the cmd was released */
+ case BLKPREP_KILL:
+ goto kill;
+ case BLKPREP_DEFER:
+ goto defer;
+ }
+
+ /*
+ * Initialize the actual SCSI command for this request.
+ */
+ if (blk_pc_request(req)) {
+ scsi_setup_blk_pc_cmnd(cmd);
+ } else if (req->rq_disk) {
+ struct scsi_driver *drv;
+
+ drv = *(struct scsi_driver **)req->rq_disk->private_data;
+ if (unlikely(!drv->init_command(cmd))) {
+ scsi_release_buffers(cmd);
+ scsi_put_command(cmd);
+ goto kill;
+ }
+ }
}
- return ret;
+ /*
+ * The request is now prepped, no need to come back here
+ */
+ req->cmd_flags |= REQ_DONTPREP;
+ return BLKPREP_OK;
+
+ defer:
+ /* If we defer, the elv_next_request() returns NULL, but the
+ * queue must be restarted, so we plug here if no returning
+ * command will automatically do that. */
+ if (sdev->device_busy == 0)
+ blk_plug_device(q);
+ return BLKPREP_DEFER;
+ kill:
+ req->errors = DID_NO_CONNECT << 16;
+ return BLKPREP_KILL;
}
/*
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