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ide-tape: fix READ POSITION cmd handling 

ide-tape used to issue READ POSITION in several places and the
evaluation of the returned READ POSITION data was done in the
->pc_callback. Convert it to use local buffer and move that
evaluation chunk in the idetape_read_position(). Additionally, fold
idetape_create_read_position_cmd() into it, too, thus concentrating READ
POSITION handling in one method only and making all places call that.

Finally, mv {idetape,ide_tape}_read_position.

There should be no functional change resulting from this patch.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
This commit is contained in:
Borislav Petkov 2009-05-04 09:38:15 +02:00
parent 837272b4f9
commit 55ce3a129e
1 changed files with 49 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

102
drivers/ide/ide-tape.c
View File

@ -386,30 +386,7 @@ static int ide_tape_callback(ide_drive_t *drive, int dsc)
uptodate = 0;
err = pc->error;
}
} else if (pc->c[0] == READ_POSITION && uptodate) {
u8 *readpos = pc->buf;
debug_log(DBG_SENSE, "BOP - %s\n",
(readpos[0] & 0x80) ? "Yes" : "No");
debug_log(DBG_SENSE, "EOP - %s\n",
(readpos[0] & 0x40) ? "Yes" : "No");
if (readpos[0] & 0x4) {
printk(KERN_INFO "ide-tape: Block location is unknown"
"to the tape\n");
clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
uptodate = 0;
err = IDE_DRV_ERROR_GENERAL;
} else {
debug_log(DBG_SENSE, "Block Location - %u\n",
be32_to_cpup((__be32 *)&readpos[4]));
tape->partition = readpos[1];
tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
}
}
rq->errors = err;
return uptodate;
@ -778,26 +755,44 @@ static int idetape_flush_tape_buffers(ide_drive_t *drive)
return 0;
}
static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
{
ide_init_pc(pc);
pc->c[0] = READ_POSITION;
pc->req_xfer = 20;
}
static int idetape_read_position(ide_drive_t *drive)
static int ide_tape_read_position(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc pc;
int position;
u8 buf[20];
debug_log(DBG_PROCS, "Enter %s\n", __func__);
idetape_create_read_position_cmd(&pc);
if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.buf, pc.req_xfer))
/* prep cmd */
ide_init_pc(&pc);
pc.c[0] = READ_POSITION;
pc.req_xfer = 20;
if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer))
return -1;
position = tape->first_frame;
return position;
if (!pc.error) {
debug_log(DBG_SENSE, "BOP - %s\n",
(buf[0] & 0x80) ? "Yes" : "No");
debug_log(DBG_SENSE, "EOP - %s\n",
(buf[0] & 0x40) ? "Yes" : "No");
if (buf[0] & 0x4) {
printk(KERN_INFO "ide-tape: Block location is unknown"
"to the tape\n");
clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
return -1;
} else {
debug_log(DBG_SENSE, "Block Location - %u\n",
be32_to_cpup((__be32 *)&buf[4]));
tape->partition = buf[1];
tape->first_frame = be32_to_cpup((__be32 *)&buf[4]);
set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
}
}
return tape->first_frame;
}
static void idetape_create_locate_cmd(ide_drive_t *drive,
@ -840,19 +835,21 @@ static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
{
idetape_tape_t *tape = drive->driver_data;
struct gendisk *disk = tape->disk;
int retval;
int ret;
struct ide_atapi_pc pc;
if (tape->chrdev_dir == IDETAPE_DIR_READ)
__ide_tape_discard_merge_buffer(drive);
idetape_wait_ready(drive, 60 * 5 * HZ);
idetape_create_locate_cmd(drive, &pc, block, partition, skip);
retval = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
if (retval)
return (retval);
ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
if (ret)
return ret;
idetape_create_read_position_cmd(&pc);
return ide_queue_pc_tail(drive, disk, &pc, pc.buf, pc.req_xfer);
ret = ide_tape_read_position(drive);
if (ret < 0)
return ret;
return 0;
}
static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
@ -863,7 +860,7 @@ static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
__ide_tape_discard_merge_buffer(drive);
if (restore_position) {
position = idetape_read_position(drive);
position = ide_tape_read_position(drive);
seek = position > 0 ? position : 0;
if (idetape_position_tape(drive, seek, 0, 0)) {
printk(KERN_INFO "ide-tape: %s: position_tape failed in"
@ -1042,20 +1039,19 @@ static int idetape_rewind_tape(ide_drive_t *drive)
{
struct ide_tape_obj *tape = drive->driver_data;
struct gendisk *disk = tape->disk;
int retval;
struct ide_atapi_pc pc;
int ret;
debug_log(DBG_SENSE, "Enter %s\n", __func__);
idetape_create_rewind_cmd(drive, &pc);
retval = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
if (retval)
return retval;
ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
if (ret)
return ret;
idetape_create_read_position_cmd(&pc);
retval = ide_queue_pc_tail(drive, disk, &pc, pc.buf, pc.req_xfer);
if (retval)
return retval;
ret = ide_tape_read_position(drive);
if (ret < 0)
return ret;
return 0;
}
@ -1413,7 +1409,7 @@ static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
if (cmd == MTIOCGET || cmd == MTIOCPOS) {
block_offset = tape->valid /
(tape->blk_size * tape->user_bs_factor);
position = idetape_read_position(drive);
position = ide_tape_read_position(drive);
if (position < 0)
return -EIO;
}
@ -1516,7 +1512,7 @@ static int idetape_chrdev_open(struct inode *inode, struct file *filp)
goto out_put_tape;
}
idetape_read_position(drive);
ide_tape_read_position(drive);
if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
(void)idetape_rewind_tape(drive);