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Commit bb0d28aa authored by Kai Mäkisara's avatar Kai Mäkisara Committed by James Bottomley
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[PATCH] SCSI tape fixes: sense descriptor init, bsf->weof, blkno, 

Problems fixed:

- the sense descriptor is cleared before filling
- BSF and BSFM are added to the commands causing automatic writing of filemark
  if the previous operation was write (tar expects this)
- the block number is set to unknown (-1) if spacing forward ends at BLANK CHECK
- debugging printout of spacing counts fixed to work also with 64-bit systems
Signed-off-by: default avatarKai Makisara <kai.makisara@kolumbus.fi>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent cf65abbc
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Showing with 34 additions and 38 deletions
Documentation/scsi/st.txt
View file @ bb0d28aa
......@@ -2,7 +2,7 @@ This file contains brief information about the SCSI tape driver.
The driver is currently maintained by Kai Mäkisara (email
Kai.Makisara@kolumbus.fi)
Last modified: Sun Feb 20 22:28:27 2005 by kai.makisara
Last modified: Mon Mar 7 21:14:44 2005 by kai.makisara
BASICS
......@@ -85,8 +85,8 @@ writing and the last operation has been a write. Two filemarks can be
optionally written. In both cases end of data is signified by
returning zero bytes for two consecutive reads.
If the rewind, offline, or seek is done and previous tape operation was write,
a filemark is written before moving tape.
If rewind, offline, bsf, or seek is done and previous tape operation was
write, a filemark is written before moving tape.
The compile options are defined in the file linux/drivers/scsi/st_options.h.
......
drivers/scsi/st.c
View file @ bb0d28aa
......@@ -17,7 +17,7 @@
Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
*/
static char *verstr = "20050213";
static char *verstr = "20050307";
#include <linux/module.h>
......@@ -268,6 +268,7 @@ static void st_analyze_sense(struct scsi_request *SRpnt, struct st_cmdstatus *s)
const u8 *ucp;
const u8 *sense = SRpnt->sr_sense_buffer;
memset(s, 0, sizeof(struct st_cmdstatus));
s->have_sense = scsi_request_normalize_sense(SRpnt, &s->sense_hdr);
if (s->have_sense) {
......@@ -287,8 +288,6 @@ static void st_analyze_sense(struct scsi_request *SRpnt, struct st_cmdstatus *s)
ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
s->flags = ucp ? (ucp[3] & 0xe0) : 0;
break;
default:
s->flags = 0;
}
}
}
......@@ -2413,6 +2412,22 @@ static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_cod
return retval;
}
#if DEBUG
#define ST_DEB_FORWARD 0
#define ST_DEB_BACKWARD 1
static void deb_space_print(char *name, int direction, char *units, unsigned char *cmd)
{
s32 sc;
sc = cmd[2] & 0x80 ? 0xff000000 : 0;
sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
if (direction)
sc = -sc;
printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name,
direction ? "backward" : "forward", sc, units);
}
#endif
/* Internal ioctl function */
static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
......@@ -2451,8 +2466,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[2] = (arg >> 16);
cmd[3] = (arg >> 8);
cmd[4] = arg;
DEBC(printk(ST_DEB_MSG "%s: Spacing tape forward over %d filemarks.\n",
name, cmd[2] * 65536 + cmd[3] * 256 + cmd[4]));
DEBC(deb_space_print(name, ST_DEB_FORWARD, "filemarks", cmd);)
if (fileno >= 0)
fileno += arg;
blkno = 0;
......@@ -2467,14 +2481,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[2] = (ltmp >> 16);
cmd[3] = (ltmp >> 8);
cmd[4] = ltmp;
DEBC(
if (cmd[2] & 0x80)
ltmp = 0xff000000;
ltmp = ltmp | (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
printk(ST_DEB_MSG
"%s: Spacing tape backward over %ld filemarks.\n",
name, (-ltmp));
)
DEBC(deb_space_print(name, ST_DEB_BACKWARD, "filemarks", cmd);)
if (fileno >= 0)
fileno -= arg;
blkno = (-1); /* We can't know the block number */
......@@ -2486,8 +2493,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[2] = (arg >> 16);
cmd[3] = (arg >> 8);
cmd[4] = arg;
DEBC(printk(ST_DEB_MSG "%s: Spacing tape forward %d blocks.\n", name,
cmd[2] * 65536 + cmd[3] * 256 + cmd[4]));
DEBC(deb_space_print(name, ST_DEB_FORWARD, "blocks", cmd);)
if (blkno >= 0)
blkno += arg;
at_sm &= (arg == 0);
......@@ -2499,13 +2505,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[2] = (ltmp >> 16);
cmd[3] = (ltmp >> 8);
cmd[4] = ltmp;
DEBC(
if (cmd[2] & 0x80)
ltmp = 0xff000000;
ltmp = ltmp | (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
printk(ST_DEB_MSG
"%s: Spacing tape backward %ld blocks.\n", name, (-ltmp));
)
DEBC(deb_space_print(name, ST_DEB_BACKWARD, "blocks", cmd);)
if (blkno >= 0)
blkno -= arg;
at_sm &= (arg == 0);
......@@ -2516,8 +2516,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[2] = (arg >> 16);
cmd[3] = (arg >> 8);
cmd[4] = arg;
DEBC(printk(ST_DEB_MSG "%s: Spacing tape forward %d setmarks.\n", name,
cmd[2] * 65536 + cmd[3] * 256 + cmd[4]));
DEBC(deb_space_print(name, ST_DEB_FORWARD, "setmarks", cmd);)
if (arg != 0) {
blkno = fileno = (-1);
at_sm = 1;
......@@ -2530,13 +2529,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[2] = (ltmp >> 16);
cmd[3] = (ltmp >> 8);
cmd[4] = ltmp;
DEBC(
if (cmd[2] & 0x80)
ltmp = 0xff000000;
ltmp = ltmp | (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
printk(ST_DEB_MSG "%s: Spacing tape backward %ld setmarks.\n",
name, (-ltmp));
)
DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);)
if (arg != 0) {
blkno = fileno = (-1);
at_sm = 1;
......@@ -2606,7 +2599,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[1] = 3;
DEBC(printk(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n",
name));
blkno = 0;
blkno = -1;
at_sm = 0;
break;
case MTERASE:
......@@ -2767,7 +2760,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
STps->drv_file = fileno - undone;
else
STps->drv_file = fileno;
STps->drv_block = 0;
STps->drv_block = -1;
STps->eof = ST_NOEOF;
} else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
if (arg > 0 && undone < 0) /* Some drives get this wrong */
......@@ -3245,12 +3238,15 @@ static int st_ioctl(struct inode *inode, struct file *file,
}
if (STps->rw == ST_WRITING &&
(mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
mtc.mt_op == MTSEEK)) {
mtc.mt_op == MTSEEK ||
mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
i = st_int_ioctl(STp, MTWEOF, 1);
if (i < 0) {
retval = i;
goto out;
}
if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
mtc.mt_count++;
STps->rw = ST_IDLE;
}
......
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