debug_info_t *TAPE_DBF_AREA = NULL;
EXPORT_SYMBOL(TAPE_DBF_AREA);
-#define TAPE34XX_FMT_3480 0
-#define TAPE34XX_FMT_3480_2_XF 1
-#define TAPE34XX_FMT_3480_XF 2
-
struct tape_34xx_block_id {
- unsigned int wrap : 1;
- unsigned int segment : 7;
- unsigned int format : 2;
+ unsigned int unused : 10;
unsigned int block : 22;
};
-/*
- * A list of block ID's is used to faster seek blocks.
- */
-struct tape_34xx_sbid {
- struct list_head list;
- struct tape_34xx_block_id bid;
-};
-
-static void tape_34xx_delete_sbid_from(struct tape_device *, int);
-
/*
* Medium sense for 34xx tapes. There is no 'real' medium sense call.
* So we just do a normal sense.
tape_34xx_done(struct tape_request *request)
{
DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
-
- switch (request->op) {
- case TO_DSE:
- case TO_RUN:
- case TO_WRI:
- case TO_WTM:
- case TO_ASSIGN:
- case TO_UNASSIGN:
- tape_34xx_delete_sbid_from(request->device, 0);
- break;
- default:
- ;
- }
return TAPE_IO_SUCCESS;
}
if (irb->scsw.cmd.dstat == 0x85) { /* READY */
/* A medium was inserted in the drive. */
DBF_EVENT(6, "xuud med\n");
- tape_34xx_delete_sbid_from(device, 0);
tape_34xx_schedule_work(device, TO_MSEN);
} else {
DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
*/
case TO_LBL:
/* Block could not be located. */
- tape_34xx_delete_sbid_from(device, 0);
return tape_34xx_erp_failed(request, -EIO);
case TO_RFO:
*/
dev_warn (&device->cdev->dev, "The tape unit failed to load"
" the cartridge\n");
- tape_34xx_delete_sbid_from(device, 0);
return tape_34xx_erp_failed(request, -EIO);
case 0x34:
/*
/* Manual rewind or unload. This causes an I/O error. */
dev_warn (&device->cdev->dev, "The tape medium has been "
"rewound or unloaded manually\n");
- tape_34xx_delete_sbid_from(device, 0);
return tape_34xx_erp_failed(request, -EIO);
case 0x42:
/*
return tape_34xx_erp_retry(request);
case 0x43:
/* Drive not ready. */
- tape_34xx_delete_sbid_from(device, 0);
tape_med_state_set(device, MS_UNLOADED);
/* Some commands commands are successful even in this case */
if (sense[1] & SENSE_DRIVE_ONLINE) {
/* Volume fenced. CU reports volume integrity is lost. */
dev_warn (&device->cdev->dev, "The control unit has fenced "
"access to the tape volume\n");
- tape_34xx_delete_sbid_from(device, 0);
return tape_34xx_erp_failed(request, -EIO);
case 0x48:
/* Log sense data and retry request. */
/* End of Volume complete. Rewind unload completed ok. */
if (request->op == TO_RUN) {
tape_med_state_set(device, MS_UNLOADED);
- tape_34xx_delete_sbid_from(device, 0);
return tape_34xx_erp_succeeded(request);
}
return tape_34xx_erp_bug(device, request, irb, sense[3]);
return TAPE_IO_STOP;
}
-static inline void
-tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l)
-{
- struct tape_34xx_sbid * new_sbid;
-
- new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC);
- if (!new_sbid)
- return;
-
- new_sbid->bid = bid;
- list_add(&new_sbid->list, l);
-}
-
-/*
- * Build up the search block ID list. The block ID consists of a logical
- * block number and a hardware specific part. The hardware specific part
- * helps the tape drive to speed up searching for a specific block.
- */
-static void
-tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid)
-{
- struct list_head * sbid_list;
- struct tape_34xx_sbid * sbid;
- struct list_head * l;
-
- /*
- * immediately return if there is no list at all or the block to add
- * is located in segment 1 of wrap 0 because this position is used
- * if no hardware position data is supplied.
- */
- sbid_list = (struct list_head *) device->discdata;
- if (!sbid_list || (bid.segment < 2 && bid.wrap == 0))
- return;
-
- /*
- * Search the position where to insert the new entry. Hardware
- * acceleration uses only the segment and wrap number. So we
- * need only one entry for a specific wrap/segment combination.
- * If there is a block with a lower number but the same hard-
- * ware position data we just update the block number in the
- * existing entry.
- */
- list_for_each(l, sbid_list) {
- sbid = list_entry(l, struct tape_34xx_sbid, list);
-
- if (
- (sbid->bid.segment == bid.segment) &&
- (sbid->bid.wrap == bid.wrap)
- ) {
- if (bid.block < sbid->bid.block)
- sbid->bid = bid;
- else return;
- break;
- }
-
- /* Sort in according to logical block number. */
- if (bid.block < sbid->bid.block) {
- tape_34xx_append_new_sbid(bid, l->prev);
- break;
- }
- }
- /* List empty or new block bigger than last entry. */
- if (l == sbid_list)
- tape_34xx_append_new_sbid(bid, l->prev);
-
- DBF_LH(4, "Current list is:\n");
- list_for_each(l, sbid_list) {
- sbid = list_entry(l, struct tape_34xx_sbid, list);
- DBF_LH(4, "%d:%03d@%05d\n",
- sbid->bid.wrap,
- sbid->bid.segment,
- sbid->bid.block
- );
- }
-}
-
-/*
- * Delete all entries from the search block ID list that belong to tape blocks
- * equal or higher than the given number.
- */
-static void
-tape_34xx_delete_sbid_from(struct tape_device *device, int from)
-{
- struct list_head * sbid_list;
- struct tape_34xx_sbid * sbid;
- struct list_head * l;
- struct list_head * n;
-
- sbid_list = (struct list_head *) device->discdata;
- if (!sbid_list)
- return;
-
- list_for_each_safe(l, n, sbid_list) {
- sbid = list_entry(l, struct tape_34xx_sbid, list);
- if (sbid->bid.block >= from) {
- DBF_LH(4, "Delete sbid %d:%03d@%05d\n",
- sbid->bid.wrap,
- sbid->bid.segment,
- sbid->bid.block
- );
- list_del(l);
- kfree(sbid);
- }
- }
-}
-
-/*
- * Merge hardware position data into a block id.
- */
-static void
-tape_34xx_merge_sbid(
- struct tape_device * device,
- struct tape_34xx_block_id * bid
-) {
- struct tape_34xx_sbid * sbid;
- struct tape_34xx_sbid * sbid_to_use;
- struct list_head * sbid_list;
- struct list_head * l;
-
- sbid_list = (struct list_head *) device->discdata;
- bid->wrap = 0;
- bid->segment = 1;
-
- if (!sbid_list || list_empty(sbid_list))
- return;
-
- sbid_to_use = NULL;
- list_for_each(l, sbid_list) {
- sbid = list_entry(l, struct tape_34xx_sbid, list);
-
- if (sbid->bid.block >= bid->block)
- break;
- sbid_to_use = sbid;
- }
- if (sbid_to_use) {
- bid->wrap = sbid_to_use->bid.wrap;
- bid->segment = sbid_to_use->bid.segment;
- DBF_LH(4, "Use %d:%03d@%05d for %05d\n",
- sbid_to_use->bid.wrap,
- sbid_to_use->bid.segment,
- sbid_to_use->bid.block,
- bid->block
- );
- }
-}
-
static int
tape_34xx_setup_device(struct tape_device * device)
{
- int rc;
- struct list_head * discdata;
+ int rc;
DBF_EVENT(6, "34xx device setup\n");
if ((rc = tape_std_assign(device)) == 0) {
DBF_LH(3, "34xx medium sense returned %d\n", rc);
}
}
- discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL);
- if (discdata) {
- INIT_LIST_HEAD(discdata);
- device->discdata = discdata;
- }
-
return rc;
}
tape_34xx_cleanup_device(struct tape_device *device)
{
tape_std_unassign(device);
-
- if (device->discdata) {
- tape_34xx_delete_sbid_from(device, 0);
- kfree(device->discdata);
- device->discdata = NULL;
- }
}
if (rc)
return rc;
- tape_34xx_add_sbid(device, block_id.cbid);
return block_id.cbid.block;
}
/* setup ccws */
request->op = TO_LBL;
bid = (struct tape_34xx_block_id *) request->cpdata;
- bid->format = (*device->modeset_byte & 0x08) ?
- TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480;
bid->block = mt_count;
- tape_34xx_merge_sbid(device, bid);
tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
projects / thirdparty / linux.git / commitdiff
