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path: root/drivers/scsi/st.c
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Diffstat (limited to 'drivers/scsi/st.c')
-rw-r--r--drivers/scsi/st.c130
1 files changed, 105 insertions, 25 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 5a9bcf8e0792..74a6830b7ed8 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -46,7 +46,7 @@ static const char *verstr = "20160209";
#include <linux/uaccess.h>
#include <asm/dma.h>
-#include <asm/unaligned.h>
+#include <linux/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_dbg.h>
@@ -163,9 +163,11 @@ static const char *st_formats[] = {
static int debugging = DEBUG;
+/* Setting these non-zero may risk recognizing resets */
#define MAX_RETRIES 0
#define MAX_WRITE_RETRIES 0
#define MAX_READY_RETRIES 0
+
#define NO_TAPE NOT_READY
#define ST_TIMEOUT (900 * HZ)
@@ -206,7 +208,6 @@ static int st_remove(struct device *);
static struct scsi_driver st_template = {
.gendrv = {
.name = "st",
- .owner = THIS_MODULE,
.probe = st_probe,
.remove = st_remove,
.groups = st_drv_groups,
@@ -358,10 +359,18 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
{
int result = SRpnt->result;
u8 scode;
+ unsigned int ctr;
DEB(const char *stp;)
char *name = STp->name;
struct st_cmdstatus *cmdstatp;
+ ctr = scsi_get_ua_por_ctr(STp->device);
+ if (ctr != STp->por_ctr) {
+ STp->por_ctr = ctr;
+ STp->pos_unknown = 1; /* ASC => power on / reset */
+ st_printk(KERN_WARNING, STp, "Power on/reset recognized.");
+ }
+
if (!result)
return 0;
@@ -414,10 +423,11 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
if (cmdstatp->have_sense &&
cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
- if (cmdstatp->have_sense && scode == UNIT_ATTENTION && cmdstatp->sense_hdr.asc == 0x29)
+ if (cmdstatp->have_sense && scode == UNIT_ATTENTION &&
+ cmdstatp->sense_hdr.asc == 0x29 && !STp->pos_unknown) {
STp->pos_unknown = 1; /* ASC => power on / reset */
-
- STp->pos_unknown |= STp->device->was_reset;
+ st_printk(KERN_WARNING, STp, "Power on/reset recognized.");
+ }
if (cmdstatp->have_sense &&
scode == RECOVERED_ERROR
@@ -835,6 +845,9 @@ static int flush_buffer(struct scsi_tape *STp, int seek_next)
int backspace, result;
struct st_partstat *STps;
+ if (STp->ready != ST_READY)
+ return 0;
+
/*
* If there was a bus reset, block further access
* to this device.
@@ -842,8 +855,6 @@ static int flush_buffer(struct scsi_tape *STp, int seek_next)
if (STp->pos_unknown)
return (-EIO);
- if (STp->ready != ST_READY)
- return 0;
STps = &(STp->ps[STp->partition]);
if (STps->rw == ST_WRITING) /* Writing */
return st_flush_write_buffer(STp);
@@ -952,7 +963,6 @@ static void reset_state(struct scsi_tape *STp)
STp->partition = find_partition(STp);
if (STp->partition < 0)
STp->partition = 0;
- STp->new_partition = STp->partition;
}
}
@@ -969,6 +979,7 @@ static int test_ready(struct scsi_tape *STp, int do_wait)
{
int attentions, waits, max_wait, scode;
int retval = CHKRES_READY, new_session = 0;
+ unsigned int ctr;
unsigned char cmd[MAX_COMMAND_SIZE];
struct st_request *SRpnt = NULL;
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
@@ -991,7 +1002,10 @@ static int test_ready(struct scsi_tape *STp, int do_wait)
scode = cmdstatp->sense_hdr.sense_key;
if (scode == UNIT_ATTENTION) { /* New media? */
- new_session = 1;
+ if (cmdstatp->sense_hdr.asc == 0x28) { /* New media */
+ new_session = 1;
+ DEBC_printk(STp, "New tape session.");
+ }
if (attentions < MAX_ATTENTIONS) {
attentions++;
continue;
@@ -1022,11 +1036,23 @@ static int test_ready(struct scsi_tape *STp, int do_wait)
}
}
+ ctr = scsi_get_ua_new_media_ctr(STp->device);
+ if (ctr != STp->new_media_ctr) {
+ STp->new_media_ctr = ctr;
+ new_session = 1;
+ DEBC_printk(STp, "New tape session.");
+ }
+
retval = (STp->buffer)->syscall_result;
if (!retval)
retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
break;
}
+ if (STp->first_tur) {
+ /* Don't set pos_unknown right after device recognition */
+ STp->pos_unknown = 0;
+ STp->first_tur = 0;
+ }
if (SRpnt != NULL)
st_release_request(SRpnt);
@@ -2889,7 +2915,6 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
timeout = STp->long_timeout * 8;
DEBC_printk(STp, "Erasing tape.\n");
- fileno = blkno = at_sm = 0;
break;
case MTSETBLK: /* Set block length */
case MTSETDENSITY: /* Set tape density */
@@ -2922,14 +2947,17 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
if (cmd_in == MTSETDENSITY) {
(STp->buffer)->b_data[4] = arg;
STp->density_changed = 1; /* At least we tried ;-) */
+ STp->changed_density = arg;
} else if (cmd_in == SET_DENS_AND_BLK)
(STp->buffer)->b_data[4] = arg >> 24;
else
(STp->buffer)->b_data[4] = STp->density;
if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
ltmp = arg & MT_ST_BLKSIZE_MASK;
- if (cmd_in == MTSETBLK)
+ if (cmd_in == MTSETBLK) {
STp->blksize_changed = 1; /* At least we tried ;-) */
+ STp->changed_blksize = arg;
+ }
} else
ltmp = STp->block_size;
(STp->buffer)->b_data[9] = (ltmp >> 16);
@@ -3076,7 +3104,9 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd_in == MTSETDRVBUFFER ||
cmd_in == SET_DENS_AND_BLK) {
if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
- !(STp->use_pf & PF_TESTED)) {
+ cmdstatp->sense_hdr.asc == 0x24 &&
+ (STp->device)->scsi_level <= SCSI_2 &&
+ !(STp->use_pf & PF_TESTED)) {
/* Try the other possible state of Page Format if not
already tried */
STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
@@ -3506,6 +3536,7 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
int i, cmd_nr, cmd_type, bt;
int retval = 0;
unsigned int blk;
+ bool cmd_mtiocget;
struct scsi_tape *STp = file->private_data;
struct st_modedef *STm;
struct st_partstat *STps;
@@ -3619,6 +3650,7 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
*/
if (mtc.mt_op != MTREW &&
mtc.mt_op != MTOFFL &&
+ mtc.mt_op != MTLOAD &&
mtc.mt_op != MTRETEN &&
mtc.mt_op != MTERASE &&
mtc.mt_op != MTSEEK &&
@@ -3626,9 +3658,23 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
retval = (-EIO);
goto out;
}
- reset_state(STp);
- /* remove this when the midlevel properly clears was_reset */
- STp->device->was_reset = 0;
+ reset_state(STp); /* Clears pos_unknown */
+
+ /* Fix the device settings after reset, ignore errors */
+ if (mtc.mt_op == MTREW || mtc.mt_op == MTSEEK ||
+ mtc.mt_op == MTEOM) {
+ if (STp->can_partitions) {
+ /* STp->new_partition contains the
+ * latest partition set
+ */
+ STp->partition = 0;
+ switch_partition(STp);
+ }
+ if (STp->density_changed)
+ st_int_ioctl(STp, MTSETDENSITY, STp->changed_density);
+ if (STp->blksize_changed)
+ st_int_ioctl(STp, MTSETBLK, STp->changed_blksize);
+ }
}
if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
@@ -3732,17 +3778,28 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
goto out;
}
+ cmd_mtiocget = cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET);
+
if ((i = flush_buffer(STp, 0)) < 0) {
- retval = i;
- goto out;
- }
- if (STp->can_partitions &&
- (i = switch_partition(STp)) < 0) {
- retval = i;
- goto out;
+ if (cmd_mtiocget && STp->pos_unknown) {
+ /* flush fails -> modify status accordingly */
+ reset_state(STp);
+ STp->pos_unknown = 1;
+ } else { /* return error */
+ retval = i;
+ goto out;
+ }
+ } else { /* flush_buffer succeeds */
+ if (STp->can_partitions) {
+ i = switch_partition(STp);
+ if (i < 0) {
+ retval = i;
+ goto out;
+ }
+ }
}
- if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
+ if (cmd_mtiocget) {
struct mtget mt_status;
if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
@@ -3756,7 +3813,7 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
mt_status.mt_blkno = STps->drv_block;
mt_status.mt_fileno = STps->drv_file;
- if (STp->block_size != 0) {
+ if (STp->block_size != 0 && mt_status.mt_blkno >= 0) {
if (STps->rw == ST_WRITING)
mt_status.mt_blkno +=
(STp->buffer)->buffer_bytes / STp->block_size;
@@ -4101,7 +4158,7 @@ static void validate_options(void)
*/
static int __init st_setup(char *str)
{
- int i, len, ints[5];
+ int i, len, ints[ARRAY_SIZE(parms) + 1];
char *stp;
stp = get_options(str, ARRAY_SIZE(ints), ints);
@@ -4312,6 +4369,7 @@ static int st_probe(struct device *dev)
blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
tpnt->long_timeout = ST_LONG_TIMEOUT;
tpnt->try_dio = try_direct_io;
+ tpnt->first_tur = 1;
for (i = 0; i < ST_NBR_MODES; i++) {
STm = &(tpnt->modes[i]);
@@ -4362,6 +4420,9 @@ static int st_probe(struct device *dev)
goto out_idr_remove;
}
+ tpnt->new_media_ctr = scsi_get_ua_new_media_ctr(SDp);
+ tpnt->por_ctr = scsi_get_ua_por_ctr(SDp);
+
dev_set_drvdata(dev, tpnt);
@@ -4643,6 +4704,24 @@ options_show(struct device *dev, struct device_attribute *attr, char *buf)
}
static DEVICE_ATTR_RO(options);
+/**
+ * position_lost_in_reset_show - Value 1 indicates that reads, writes, etc.
+ * are blocked because a device reset has occurred and no operation positioning
+ * the tape has been issued.
+ * @dev: struct device
+ * @attr: attribute structure
+ * @buf: buffer to return formatted data in
+ */
+static ssize_t position_lost_in_reset_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct st_modedef *STm = dev_get_drvdata(dev);
+ struct scsi_tape *STp = STm->tape;
+
+ return sprintf(buf, "%d", STp->pos_unknown);
+}
+static DEVICE_ATTR_RO(position_lost_in_reset);
+
/* Support for tape stats */
/**
@@ -4827,6 +4906,7 @@ static struct attribute *st_dev_attrs[] = {
&dev_attr_default_density.attr,
&dev_attr_default_compression.attr,
&dev_attr_options.attr,
+ &dev_attr_position_lost_in_reset.attr,
NULL,
};
generated by cgit (git 2.34.1) at 2025-07-12 17:26:15 +0000