Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
*/
-static char *verstr = "20050312";
+static const char *verstr = "20050830";
#include <linux/module.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/mtio.h>
+#include <linux/cdrom.h>
#include <linux/ioctl.h>
#include <linux/fcntl.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/moduleparam.h>
-#include <linux/devfs_fs_kernel.h>
#include <linux/cdev.h>
#include <linux/delay.h>
+#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <asm/dma.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>
-#include <scsi/scsi_request.h>
+#include <scsi/sg.h>
/* The driver prints some debugging information on the console if DEBUG
static int st_dev_max;
static int st_nr_dev;
-static struct class_simple *st_sysfs_class;
+static struct class *st_sysfs_class;
MODULE_AUTHOR("Kai Makisara");
-MODULE_DESCRIPTION("SCSI Tape Driver");
+MODULE_DESCRIPTION("SCSI tape (st) driver");
MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
/* Set 'perm' (4th argument) to 0 to disable module_param's definition
* of sysfs parameters (which module_param doesn't yet support).
#endif
/* Bit reversed order to get same names for same minors with all
mode counts */
-static char *st_formats[] = {
+static const char *st_formats[] = {
"", "r", "k", "s", "l", "t", "o", "u",
"m", "v", "p", "x", "a", "y", "q", "z"};
static void move_buffer_data(struct st_buffer *, int);
static void buf_to_sg(struct st_buffer *, unsigned int);
-static int st_map_user_pages(struct scatterlist *, const unsigned int,
- unsigned long, size_t, int, unsigned long);
static int sgl_map_user_pages(struct scatterlist *, const unsigned int,
unsigned long, size_t, int);
static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int);
static int st_probe(struct device *);
static int st_remove(struct device *);
-static int st_init_command(struct scsi_cmnd *);
static void do_create_driverfs_files(void);
static void do_remove_driverfs_files(void);
.probe = st_probe,
.remove = st_remove,
},
- .init_command = st_init_command,
};
static int st_compression(struct scsi_tape *, int);
static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
+static void scsi_tape_release(struct kref *);
+
+#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
+
+static DEFINE_MUTEX(st_ref_mutex);
+
\f
#include "osst_detect.h"
#ifndef SIGS_FROM_OSST
{"OnStream", "FW-", "", "osst"}
#endif
+static struct scsi_tape *scsi_tape_get(int dev)
+{
+ struct scsi_tape *STp = NULL;
+
+ mutex_lock(&st_ref_mutex);
+ write_lock(&st_dev_arr_lock);
+
+ if (dev < st_dev_max && scsi_tapes != NULL)
+ STp = scsi_tapes[dev];
+ if (!STp) goto out;
+
+ kref_get(&STp->kref);
+
+ if (!STp->device)
+ goto out_put;
+
+ if (scsi_device_get(STp->device))
+ goto out_put;
+
+ goto out;
+
+out_put:
+ kref_put(&STp->kref, scsi_tape_release);
+ STp = NULL;
+out:
+ write_unlock(&st_dev_arr_lock);
+ mutex_unlock(&st_ref_mutex);
+ return STp;
+}
+
+static void scsi_tape_put(struct scsi_tape *STp)
+{
+ struct scsi_device *sdev = STp->device;
+
+ mutex_lock(&st_ref_mutex);
+ kref_put(&STp->kref, scsi_tape_release);
+ scsi_device_put(sdev);
+ mutex_unlock(&st_ref_mutex);
+}
+
struct st_reject_data {
char *vendor;
char *model;
}
-static void st_analyze_sense(struct scsi_request *SRpnt, struct st_cmdstatus *s)
+static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
{
const u8 *ucp;
- const u8 *sense = SRpnt->sr_sense_buffer;
+ const u8 *sense = SRpnt->sense;
- s->have_sense = scsi_request_normalize_sense(SRpnt, &s->sense_hdr);
+ s->have_sense = scsi_normalize_sense(SRpnt->sense,
+ SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
s->flags = 0;
if (s->have_sense) {
/* Convert the result to success code */
-static int st_chk_result(struct scsi_tape *STp, struct scsi_request * SRpnt)
+static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
{
- int result = SRpnt->sr_result;
+ int result = SRpnt->result;
u8 scode;
DEB(const char *stp;)
char *name = tape_name(STp);
return 0;
cmdstatp = &STp->buffer->cmdstat;
- st_analyze_sense(STp->buffer->last_SRpnt, cmdstatp);
+ st_analyze_sense(SRpnt, cmdstatp);
if (cmdstatp->have_sense)
scode = STp->buffer->cmdstat.sense_hdr.sense_key;
DEB(
if (debugging) {
- printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x Len: %d\n",
+ printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
name, result,
- SRpnt->sr_cmnd[0], SRpnt->sr_cmnd[1], SRpnt->sr_cmnd[2],
- SRpnt->sr_cmnd[3], SRpnt->sr_cmnd[4], SRpnt->sr_cmnd[5],
- SRpnt->sr_bufflen);
+ SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
+ SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
if (cmdstatp->have_sense)
- scsi_print_req_sense("st", SRpnt);
+ __scsi_print_sense("st", SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
} ) /* end DEB */
if (!debugging) { /* Abnormal conditions for tape */
if (!cmdstatp->have_sense)
/* scode != UNIT_ATTENTION && */
scode != BLANK_CHECK &&
scode != VOLUME_OVERFLOW &&
- SRpnt->sr_cmnd[0] != MODE_SENSE &&
- SRpnt->sr_cmnd[0] != TEST_UNIT_READY) {
+ SRpnt->cmd[0] != MODE_SENSE &&
+ SRpnt->cmd[0] != TEST_UNIT_READY) {
printk(KERN_WARNING "%s: Error with sense data: ", name);
- scsi_print_req_sense("st", SRpnt);
+ __scsi_print_sense("st", SRpnt->sense,
+ SCSI_SENSE_BUFFERSIZE);
}
}
if (cmdstatp->fixed_format &&
STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
if (STp->cln_sense_value)
- STp->cleaning_req |= ((SRpnt->sr_sense_buffer[STp->cln_mode] &
+ STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
STp->cln_sense_mask) == STp->cln_sense_value);
else
- STp->cleaning_req |= ((SRpnt->sr_sense_buffer[STp->cln_mode] &
+ STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
STp->cln_sense_mask) != 0);
}
if (cmdstatp->have_sense &&
if (cmdstatp->have_sense &&
scode == RECOVERED_ERROR
#if ST_RECOVERED_WRITE_FATAL
- && SRpnt->sr_cmnd[0] != WRITE_6
- && SRpnt->sr_cmnd[0] != WRITE_FILEMARKS
+ && SRpnt->cmd[0] != WRITE_6
+ && SRpnt->cmd[0] != WRITE_FILEMARKS
#endif
) {
STp->recover_count++;
DEB(
if (debugging) {
- if (SRpnt->sr_cmnd[0] == READ_6)
+ if (SRpnt->cmd[0] == READ_6)
stp = "read";
- else if (SRpnt->sr_cmnd[0] == WRITE_6)
+ else if (SRpnt->cmd[0] == WRITE_6)
stp = "write";
else
stp = "ioctl";
/* Wakeup from interrupt */
-static void st_sleep_done(struct scsi_cmnd * SCpnt)
+static void st_sleep_done(void *data, char *sense, int result, int resid)
{
- struct scsi_tape *STp = container_of(SCpnt->request->rq_disk->private_data,
- struct scsi_tape, driver);
+ struct st_request *SRpnt = data;
+ struct scsi_tape *STp = SRpnt->stp;
- (STp->buffer)->cmdstat.midlevel_result = SCpnt->result;
- SCpnt->request->rq_status = RQ_SCSI_DONE;
- (STp->buffer)->last_SRpnt = SCpnt->sc_request;
+ memcpy(SRpnt->sense, sense, SCSI_SENSE_BUFFERSIZE);
+ (STp->buffer)->cmdstat.midlevel_result = SRpnt->result = result;
DEB( STp->write_pending = 0; )
- complete(SCpnt->request->waiting);
+ if (SRpnt->waiting)
+ complete(SRpnt->waiting);
+}
+
+static struct st_request *st_allocate_request(void)
+{
+ return kzalloc(sizeof(struct st_request), GFP_KERNEL);
+}
+
+static void st_release_request(struct st_request *streq)
+{
+ kfree(streq);
}
/* Do the scsi command. Waits until command performed if do_wait is true.
Otherwise write_behind_check() is used to check that the command
has finished. */
-static struct scsi_request *
-st_do_scsi(struct scsi_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
+static struct st_request *
+st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
int bytes, int direction, int timeout, int retries, int do_wait)
{
- unsigned char *bp;
+ struct completion *waiting;
+
+ /* if async, make sure there's no command outstanding */
+ if (!do_wait && ((STp->buffer)->last_SRpnt)) {
+ printk(KERN_ERR "%s: Async command already active.\n",
+ tape_name(STp));
+ if (signal_pending(current))
+ (STp->buffer)->syscall_result = (-EINTR);
+ else
+ (STp->buffer)->syscall_result = (-EBUSY);
+ return NULL;
+ }
if (SRpnt == NULL) {
- SRpnt = scsi_allocate_request(STp->device, GFP_ATOMIC);
+ SRpnt = st_allocate_request();
if (SRpnt == NULL) {
DEBC( printk(KERN_ERR "%s: Can't get SCSI request.\n",
tape_name(STp)); );
(STp->buffer)->syscall_result = (-EBUSY);
return NULL;
}
+ SRpnt->stp = STp;
}
- init_completion(&STp->wait);
- SRpnt->sr_use_sg = STp->buffer->do_dio || (bytes > (STp->buffer)->frp[0].length);
- if (SRpnt->sr_use_sg) {
- if (!STp->buffer->do_dio)
- buf_to_sg(STp->buffer, bytes);
- SRpnt->sr_use_sg = (STp->buffer)->sg_segs;
- bp = (char *) &((STp->buffer)->sg[0]);
- } else
- bp = (STp->buffer)->b_data;
- SRpnt->sr_data_direction = direction;
- SRpnt->sr_cmd_len = 0;
- SRpnt->sr_request->waiting = &(STp->wait);
- SRpnt->sr_request->rq_status = RQ_SCSI_BUSY;
- SRpnt->sr_request->rq_disk = STp->disk;
- STp->buffer->cmdstat.have_sense = 0;
+ /* If async IO, set last_SRpnt. This ptr tells write_behind_check
+ which IO is outstanding. It's nulled out when the IO completes. */
+ if (!do_wait)
+ (STp->buffer)->last_SRpnt = SRpnt;
- scsi_do_req(SRpnt, (void *) cmd, bp, bytes,
- st_sleep_done, timeout, retries);
+ waiting = &STp->wait;
+ init_completion(waiting);
+ SRpnt->waiting = waiting;
- if (do_wait) {
- wait_for_completion(SRpnt->sr_request->waiting);
- SRpnt->sr_request->waiting = NULL;
+ if (!STp->buffer->do_dio)
+ buf_to_sg(STp->buffer, bytes);
+
+ memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
+ STp->buffer->cmdstat.have_sense = 0;
+ STp->buffer->syscall_result = 0;
+
+ if (scsi_execute_async(STp->device, cmd, COMMAND_SIZE(cmd[0]), direction,
+ &((STp->buffer)->sg[0]), bytes, (STp->buffer)->sg_segs,
+ timeout, retries, SRpnt, st_sleep_done, GFP_KERNEL)) {
+ /* could not allocate the buffer or request was too large */
+ (STp->buffer)->syscall_result = (-EBUSY);
+ (STp->buffer)->last_SRpnt = NULL;
+ }
+ else if (do_wait) {
+ wait_for_completion(waiting);
+ SRpnt->waiting = NULL;
(STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
}
+
return SRpnt;
}
struct st_buffer *STbuffer;
struct st_partstat *STps;
struct st_cmdstatus *cmdstatp;
+ struct st_request *SRpnt;
STbuffer = STp->buffer;
if (!STbuffer->writing)
) /* end DEB */
wait_for_completion(&(STp->wait));
- (STp->buffer)->last_SRpnt->sr_request->waiting = NULL;
+ SRpnt = STbuffer->last_SRpnt;
+ STbuffer->last_SRpnt = NULL;
+ SRpnt->waiting = NULL;
- (STp->buffer)->syscall_result = st_chk_result(STp, (STp->buffer)->last_SRpnt);
- scsi_release_request((STp->buffer)->last_SRpnt);
+ (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
+ st_release_request(SRpnt);
STbuffer->buffer_bytes -= STbuffer->writing;
STps = &(STp->ps[STp->partition]);
it messes up the block number). */
static int cross_eof(struct scsi_tape * STp, int forward)
{
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
unsigned char cmd[MAX_COMMAND_SIZE];
cmd[0] = SPACE;
if (!SRpnt)
return (STp->buffer)->syscall_result;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
if ((STp->buffer)->cmdstat.midlevel_result != 0)
int offset, transfer, blks;
int result;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
struct st_partstat *STps;
result = write_behind_check(STp);
STp->dirty = 0;
(STp->buffer)->buffer_bytes = 0;
}
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
}
return result;
}
-/* Lock or unlock the drive door. Don't use when scsi_request allocated. */
+/* Lock or unlock the drive door. Don't use when st_request allocated. */
static int do_door_lock(struct scsi_tape * STp, int do_lock)
{
int retval, cmd;
int attentions, waits, max_wait, scode;
int retval = CHKRES_READY, new_session = 0;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
}
if (SRpnt != NULL)
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
return retval;
}
int i, retval, new_session = 0, do_wait;
unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
unsigned short st_flags = filp->f_flags;
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
struct st_modedef *STm;
struct st_partstat *STps;
char *name = tape_name(STp);
goto err_out;
}
- if (!SRpnt->sr_result && !STp->buffer->cmdstat.have_sense) {
+ if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
STp->max_block = ((STp->buffer)->b_data[1] << 16) |
((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
STp->min_block = ((STp->buffer)->b_data[4] << 8) |
}
STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
}
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
STp->inited = 1;
*/
filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
+ if (!(STp = scsi_tape_get(dev)))
+ return -ENXIO;
+
write_lock(&st_dev_arr_lock);
- if (dev >= st_dev_max || scsi_tapes == NULL ||
- ((STp = scsi_tapes[dev]) == NULL)) {
- write_unlock(&st_dev_arr_lock);
- return (-ENXIO);
- }
filp->private_data = STp;
name = tape_name(STp);
if (STp->in_use) {
write_unlock(&st_dev_arr_lock);
+ scsi_tape_put(STp);
DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
return (-EBUSY);
}
- if(scsi_device_get(STp->device)) {
- write_unlock(&st_dev_arr_lock);
- return (-ENXIO);
- }
STp->in_use = 1;
write_unlock(&st_dev_arr_lock);
STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
err_out:
normalize_buffer(STp->buffer);
STp->in_use = 0;
- scsi_device_put(STp->device);
+ scsi_tape_put(STp);
return retval;
}
{
int result = 0, result2;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
struct scsi_tape *STp = filp->private_data;
struct st_modedef *STm = &(STp->modes[STp->current_mode]);
struct st_partstat *STps = &(STp->ps[STp->partition]);
cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
(!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
/* Write successful at EOM */
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
if (STps->drv_file >= 0)
STps->drv_file++;
STps->eof = ST_FM;
}
else { /* Write error */
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
printk(KERN_ERR "%s: Error on write filemark.\n", name);
if (result == 0)
write_lock(&st_dev_arr_lock);
STp->in_use = 0;
write_unlock(&st_dev_arr_lock);
- scsi_device_put(STp->device);
+ scsi_tape_put(STp);
return result;
}
i = STp->try_dio && try_rdio;
else
i = STp->try_dio && try_wdio;
+
if (i && ((unsigned long)buf & queue_dma_alignment(
STp->device->request_queue)) == 0) {
- i = st_map_user_pages(&(STbp->sg[0]), STbp->use_sg,
- (unsigned long)buf, count, (is_read ? READ : WRITE),
- STp->max_pfn);
+ i = sgl_map_user_pages(&(STbp->sg[0]), STbp->use_sg,
+ (unsigned long)buf, count, (is_read ? READ : WRITE));
if (i > 0) {
STbp->do_dio = i;
STbp->buffer_bytes = 0; /* can be used as transfer counter */
/* Can be called more than once after each setup_buffer() */
-static void release_buffering(struct scsi_tape *STp)
+static void release_buffering(struct scsi_tape *STp, int is_read)
{
struct st_buffer *STbp;
STbp = STp->buffer;
if (STbp->do_dio) {
- sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, 0);
+ sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, is_read);
STbp->do_dio = 0;
+ STbp->sg_segs = 0;
}
}
int async_write;
unsigned char cmd[MAX_COMMAND_SIZE];
const char __user *b_point;
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
struct scsi_tape *STp = filp->private_data;
struct st_modedef *STm;
struct st_partstat *STps;
retval = STbp->syscall_result;
goto out;
}
- if (async_write) {
+ if (async_write && !STbp->syscall_result) {
STbp->writing = transfer;
STp->dirty = !(STbp->writing ==
STbp->buffer_bytes);
} else {
count += do_count;
STps->drv_block = (-1); /* Too cautious? */
- retval = (-EIO);
+ retval = STbp->syscall_result;
}
}
out:
if (SRpnt != NULL)
- scsi_release_request(SRpnt);
- release_buffering(STp);
+ st_release_request(SRpnt);
+ release_buffering(STp, 0);
up(&STp->lock);
return retval;
Does release user buffer mapping if it is set.
*/
static long read_tape(struct scsi_tape *STp, long count,
- struct scsi_request ** aSRpnt)
+ struct st_request ** aSRpnt)
{
int transfer, blks, bytes;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
struct st_modedef *STm;
struct st_partstat *STps;
struct st_buffer *STbp;
SRpnt = *aSRpnt;
SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
STp->device->timeout, MAX_RETRIES, 1);
- release_buffering(STp);
+ release_buffering(STp, 1);
*aSRpnt = SRpnt;
if (!SRpnt)
return STbp->syscall_result;
retval = 1;
DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
name,
- SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[1],
- SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[3],
- SRpnt->sr_sense_buffer[4], SRpnt->sr_sense_buffer[5],
- SRpnt->sr_sense_buffer[6], SRpnt->sr_sense_buffer[7]));
+ SRpnt->sense[0], SRpnt->sense[1],
+ SRpnt->sense[2], SRpnt->sense[3],
+ SRpnt->sense[4], SRpnt->sense[5],
+ SRpnt->sense[6], SRpnt->sense[7]));
if (cmdstatp->have_sense) {
if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
}
STbp->buffer_bytes = bytes - transfer;
} else {
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = *aSRpnt = NULL;
if (transfer == blks) { /* We did not get anything, error */
printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
ssize_t retval = 0;
ssize_t i, transfer;
int special, do_dio = 0;
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
struct scsi_tape *STp = filp->private_data;
struct st_modedef *STm;
struct st_partstat *STps;
out:
if (SRpnt != NULL) {
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
}
if (do_dio) {
- release_buffering(STp);
+ release_buffering(STp, 1);
STbp->buffer_bytes = 0;
}
up(&STp->lock);
static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
{
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = MODE_SENSE;
if (SRpnt == NULL)
return (STp->buffer)->syscall_result;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
return (STp->buffer)->syscall_result;
}
{
int pgo;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = MODE_SELECT;
if (SRpnt == NULL)
return (STp->buffer)->syscall_result;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
return (STp->buffer)->syscall_result;
}
DEB( char *name = tape_name(STp); )
unsigned char cmd[MAX_COMMAND_SIZE];
struct st_partstat *STps;
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
if (STp->ready != ST_READY && !load_code) {
if (STp->ready == ST_NO_TAPE)
return (STp->buffer)->syscall_result;
retval = (STp->buffer)->syscall_result;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
if (!retval) { /* SCSI command successful */
int ioctl_result;
int chg_eof = 1;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
struct st_partstat *STps;
int fileno, blkno, at_sm, undone;
int datalen = 0, direction = DMA_NONE;
ioctl_result = (STp->buffer)->syscall_result;
if (!ioctl_result) { /* SCSI command successful */
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
STps->drv_block = blkno;
STps->drv_file = fileno;
/* Try the other possible state of Page Format if not
already tried */
STp->use_pf = !STp->use_pf | PF_TESTED;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
return st_int_ioctl(STp, cmd_in, arg);
}
if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
STps->eof = ST_EOD;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
}
{
int result;
unsigned char scmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
DEB( char *name = tape_name(STp); )
if (STp->ready != ST_READY)
DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
*block, *partition));
}
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
return result;
unsigned int blk;
int timeout;
unsigned char scmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
DEB( char *name = tape_name(STp); )
if (STp->ready != ST_READY)
result = 0;
}
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
return result;
case SCSI_IOCTL_GET_BUS_NUMBER:
break;
default:
- if (!capable(CAP_SYS_ADMIN))
+ if ((cmd_in == SG_IO ||
+ cmd_in == SCSI_IOCTL_SEND_COMMAND ||
+ cmd_in == CDROM_SEND_PACKET) &&
+ !capable(CAP_SYS_RAWIO))
i = -EPERM;
else
i = scsi_cmd_ioctl(file, STp->disk, cmd_in, p);
return i;
break;
}
- if (!capable(CAP_SYS_ADMIN) &&
- (cmd_in == SCSI_IOCTL_START_UNIT || cmd_in == SCSI_IOCTL_STOP_UNIT))
- return -EPERM;
- return scsi_ioctl(STp->device, cmd_in, p);
+ retval = scsi_ioctl(STp->device, cmd_in, p);
+ if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
+ STp->rew_at_close = 0;
+ STp->ready = ST_NO_TAPE;
+ }
+ return retval;
out:
up(&STp->lock);
static struct st_buffer *
new_tape_buffer(int from_initialization, int need_dma, int max_sg)
{
- int i, priority, got = 0, segs = 0;
+ int i, got = 0;
+ gfp_t priority;
struct st_buffer *tb;
if (from_initialization)
i = sizeof(struct st_buffer) + (max_sg - 1) * sizeof(struct scatterlist) +
max_sg * sizeof(struct st_buf_fragment);
- tb = kmalloc(i, priority);
+ tb = kzalloc(i, priority);
if (!tb) {
printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
return NULL;
}
- memset(tb, 0, i);
- tb->frp_segs = tb->orig_frp_segs = segs;
+ tb->frp_segs = tb->orig_frp_segs = 0;
tb->use_sg = max_sg;
- if (segs > 0)
- tb->b_data = page_address(tb->sg[0].page);
tb->frp = (struct st_buf_fragment *)(&(tb->sg[0]) + max_sg);
tb->in_use = 1;
/* Try to allocate enough space in the tape buffer */
static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
{
- int segs, nbr, max_segs, b_size, priority, order, got;
+ int segs, nbr, max_segs, b_size, order, got;
+ gfp_t priority;
if (new_size <= STbuffer->buffer_size)
return 1;
priority = GFP_KERNEL | __GFP_NOWARN;
if (need_dma)
priority |= GFP_DMA;
- for (b_size = PAGE_SIZE, order=0;
+ for (b_size = PAGE_SIZE, order=0; order <= 6 &&
b_size < new_size - STbuffer->buffer_size;
order++, b_size *= 2)
; /* empty */
}
STbuffer->frp_segs = STbuffer->orig_frp_segs;
STbuffer->frp_sg_current = 0;
+ STbuffer->sg_segs = 0;
}
struct st_buffer *buffer;
int i, j, mode, dev_num, error;
char *stp;
- u64 bounce_limit;
if (SDp->type != TYPE_TAPE)
return -ENODEV;
if ((stp = st_incompatible(SDp))) {
- printk(KERN_INFO
- "st: Found incompatible tape at scsi%d, channel %d, id %d, lun %d\n",
- SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
+ sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
printk(KERN_INFO "st: The suggested driver is %s.\n", stp);
return -ENODEV;
}
- i = SDp->host->sg_tablesize;
+ i = min(SDp->request_queue->max_hw_segments,
+ SDp->request_queue->max_phys_segments);
if (st_max_sg_segs < i)
i = st_max_sg_segs;
buffer = new_tape_buffer(1, (SDp->host)->unchecked_isa_dma, i);
goto out_put_disk;
}
- tmp_da = kmalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC);
+ tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC);
if (tmp_da == NULL) {
write_unlock(&st_dev_arr_lock);
printk(KERN_ERR "st: Can't extend device array.\n");
goto out_put_disk;
}
- memset(tmp_da, 0, tmp_dev_max * sizeof(struct scsi_tape *));
if (scsi_tapes != NULL) {
memcpy(tmp_da, scsi_tapes,
st_dev_max * sizeof(struct scsi_tape *));
if (i >= st_dev_max)
panic("scsi_devices corrupt (st)");
- tpnt = kmalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
+ tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
if (tpnt == NULL) {
write_unlock(&st_dev_arr_lock);
printk(KERN_ERR "st: Can't allocate device descriptor.\n");
goto out_put_disk;
}
- memset(tpnt, 0, sizeof(struct scsi_tape));
+ kref_init(&tpnt->kref);
tpnt->disk = disk;
sprintf(disk->disk_name, "st%d", i);
disk->private_data = &tpnt->driver;
tpnt->tape_type = MT_ISSCSI2;
tpnt->buffer = buffer;
+ tpnt->buffer->last_SRpnt = NULL;
tpnt->inited = 0;
tpnt->dirty = 0;
tpnt->long_timeout = ST_LONG_TIMEOUT;
tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
- bounce_limit = scsi_calculate_bounce_limit(SDp->host) >> PAGE_SHIFT;
- if (bounce_limit > ULONG_MAX)
- bounce_limit = ULONG_MAX;
- tpnt->max_pfn = bounce_limit;
-
for (i = 0; i < ST_NBR_MODES; i++) {
STm = &(tpnt->modes[i]);
STm->defined = 0;
do_create_class_files(tpnt, dev_num, mode);
}
- for (mode = 0; mode < ST_NBR_MODES; ++mode) {
- /* Make sure that the minor numbers corresponding to the four
- first modes always get the same names */
- i = mode << (4 - ST_NBR_MODE_BITS);
- /* Rewind entry */
- devfs_mk_cdev(MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, 0)),
- S_IFCHR | S_IRUGO | S_IWUGO,
- "%s/mt%s", SDp->devfs_name, st_formats[i]);
- /* No-rewind entry */
- devfs_mk_cdev(MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, 1)),
- S_IFCHR | S_IRUGO | S_IWUGO,
- "%s/mt%sn", SDp->devfs_name, st_formats[i]);
- }
- disk->number = devfs_register_tape(SDp->devfs_name);
-
- printk(KERN_WARNING
- "Attached scsi tape %s at scsi%d, channel %d, id %d, lun %d\n",
- tape_name(tpnt), SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
- printk(KERN_WARNING "%s: try direct i/o: %s (alignment %d B), max page reachable by HBA %lu\n",
+ sdev_printk(KERN_WARNING, SDp,
+ "Attached scsi tape %s\n", tape_name(tpnt));
+ printk(KERN_WARNING "%s: try direct i/o: %s (alignment %d B)\n",
tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
- queue_dma_alignment(SDp->request_queue) + 1, tpnt->max_pfn);
+ queue_dma_alignment(SDp->request_queue) + 1);
return 0;
if (STm->cdevs[j]) {
if (cdev == STm->cdevs[j])
cdev = NULL;
- class_simple_device_remove(MKDEV(SCSI_TAPE_MAJOR,
- TAPE_MINOR(i, mode, j)));
+ class_device_destroy(st_sysfs_class,
+ MKDEV(SCSI_TAPE_MAJOR,
+ TAPE_MINOR(i, mode, j)));
cdev_del(STm->cdevs[j]);
}
}
write_unlock(&st_dev_arr_lock);
out_put_disk:
put_disk(disk);
- if (tpnt)
- kfree(tpnt);
+ kfree(tpnt);
out_buffer_free:
kfree(buffer);
out:
scsi_tapes[i] = NULL;
st_nr_dev--;
write_unlock(&st_dev_arr_lock);
- devfs_unregister_tape(tpnt->disk->number);
sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
"tape");
for (mode = 0; mode < ST_NBR_MODES; ++mode) {
- j = mode << (4 - ST_NBR_MODE_BITS);
- devfs_remove("%s/mt%s", SDp->devfs_name, st_formats[j]);
- devfs_remove("%s/mt%sn", SDp->devfs_name, st_formats[j]);
for (j=0; j < 2; j++) {
- class_simple_device_remove(MKDEV(SCSI_TAPE_MAJOR,
- TAPE_MINOR(i, mode, j)));
+ class_device_destroy(st_sysfs_class,
+ MKDEV(SCSI_TAPE_MAJOR,
+ TAPE_MINOR(i, mode, j)));
cdev_del(tpnt->modes[mode].cdevs[j]);
tpnt->modes[mode].cdevs[j] = NULL;
}
}
- tpnt->device = NULL;
- if (tpnt->buffer) {
- tpnt->buffer->orig_frp_segs = 0;
- normalize_buffer(tpnt->buffer);
- kfree(tpnt->buffer);
- }
- put_disk(tpnt->disk);
- kfree(tpnt);
+ mutex_lock(&st_ref_mutex);
+ kref_put(&tpnt->kref, scsi_tape_release);
+ mutex_unlock(&st_ref_mutex);
return 0;
}
}
return 0;
}
-static void st_intr(struct scsi_cmnd *SCpnt)
+/**
+ * scsi_tape_release - Called to free the Scsi_Tape structure
+ * @kref: pointer to embedded kref
+ *
+ * st_ref_mutex must be held entering this routine. Because it is
+ * called on last put, you should always use the scsi_tape_get()
+ * scsi_tape_put() helpers which manipulate the semaphore directly
+ * and never do a direct kref_put().
+ **/
+static void scsi_tape_release(struct kref *kref)
{
- scsi_io_completion(SCpnt, (SCpnt->result ? 0: SCpnt->bufflen), 1);
-}
+ struct scsi_tape *tpnt = to_scsi_tape(kref);
+ struct gendisk *disk = tpnt->disk;
-/*
- * st_init_command: only called via the scsi_cmd_ioctl (block SG_IO)
- * interface for REQ_BLOCK_PC commands.
- */
-static int st_init_command(struct scsi_cmnd *SCpnt)
-{
- struct request *rq;
+ tpnt->device = NULL;
- if (!(SCpnt->request->flags & REQ_BLOCK_PC))
- return 0;
-
- rq = SCpnt->request;
- if (sizeof(rq->cmd) > sizeof(SCpnt->cmnd))
- return 0;
-
- memcpy(SCpnt->cmnd, rq->cmd, sizeof(SCpnt->cmnd));
-
- if (rq_data_dir(rq) == WRITE)
- SCpnt->sc_data_direction = DMA_TO_DEVICE;
- else if (rq->data_len)
- SCpnt->sc_data_direction = DMA_FROM_DEVICE;
- else
- SCpnt->sc_data_direction = DMA_NONE;
+ if (tpnt->buffer) {
+ tpnt->buffer->orig_frp_segs = 0;
+ normalize_buffer(tpnt->buffer);
+ kfree(tpnt->buffer);
+ }
- SCpnt->timeout_per_command = rq->timeout;
- SCpnt->transfersize = rq->data_len;
- SCpnt->done = st_intr;
- return 1;
+ disk->private_data = NULL;
+ put_disk(disk);
+ kfree(tpnt);
+ return;
}
static int __init init_st(void)
"st: Version %s, fixed bufsize %d, s/g segs %d\n",
verstr, st_fixed_buffer_size, st_max_sg_segs);
- st_sysfs_class = class_simple_create(THIS_MODULE, "scsi_tape");
+ st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
if (IS_ERR(st_sysfs_class)) {
st_sysfs_class = NULL;
printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
do_create_driverfs_files();
return 0;
}
- if (st_sysfs_class)
- class_simple_destroy(st_sysfs_class);
unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
-
ST_MAX_TAPE_ENTRIES);
}
+ class_destroy(st_sysfs_class);
printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", SCSI_TAPE_MAJOR);
return 1;
static void __exit exit_st(void)
{
- if (st_sysfs_class)
- class_simple_destroy(st_sysfs_class);
- st_sysfs_class = NULL;
do_remove_driverfs_files();
scsi_unregister_driver(&st_template.gendrv);
unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
ST_MAX_TAPE_ENTRIES);
+ class_destroy(st_sysfs_class);
kfree(scsi_tapes);
printk(KERN_INFO "st: Unloaded.\n");
}
snprintf(name, 10, "%s%s%s", rew ? "n" : "",
STp->disk->disk_name, st_formats[i]);
st_class_member =
- class_simple_device_add(st_sysfs_class,
- MKDEV(SCSI_TAPE_MAJOR,
- TAPE_MINOR(dev_num, mode, rew)),
- &STp->device->sdev_gendev, "%s", name);
+ class_device_create(st_sysfs_class, NULL,
+ MKDEV(SCSI_TAPE_MAJOR,
+ TAPE_MINOR(dev_num, mode, rew)),
+ &STp->device->sdev_gendev, "%s", name);
if (IS_ERR(st_class_member)) {
- printk(KERN_WARNING "st%d: class_simple_device_add failed\n",
+ printk(KERN_WARNING "st%d: class_device_create failed\n",
dev_num);
goto out;
}
return;
}
-
-/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
- - mapping of all pages not successful
- - any page is above max_pfn
- (i.e., either completely successful or fails)
-*/
-static int st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
- unsigned long uaddr, size_t count, int rw,
- unsigned long max_pfn)
-{
- int i, nr_pages;
-
- nr_pages = sgl_map_user_pages(sgl, max_pages, uaddr, count, rw);
- if (nr_pages <= 0)
- return nr_pages;
-
- for (i=0; i < nr_pages; i++) {
- if (page_to_pfn(sgl[i].page) > max_pfn)
- goto out_unmap;
- }
- return nr_pages;
-
- out_unmap:
- sgl_unmap_user_pages(sgl, nr_pages, 0);
- return 0;
-}
-
-
/* The following functions may be useful for a larger audience. */
static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
unsigned long uaddr, size_t count, int rw)
{
+ unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ unsigned long start = uaddr >> PAGE_SHIFT;
+ const int nr_pages = end - start;
int res, i, j;
- unsigned int nr_pages;
struct page **pages;
- nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT;
-
/* User attempted Overflow! */
if ((uaddr + count) < uaddr)
return -EINVAL;
if (res > 0) {
for (j=0; j < res; j++)
page_cache_release(pages[j]);
+ res = 0;
}
kfree(pages);
return res;
int i;
for (i=0; i < nr_pages; i++) {
- if (dirtied && !PageReserved(sgl[i].page))
- SetPageDirty(sgl[i].page);
+ struct page *page = sgl[i].page;
+
+ if (dirtied)
+ SetPageDirty(page);
/* FIXME: cache flush missing for rw==READ
* FIXME: call the correct reference counting function
*/
- page_cache_release(sgl[i].page);
+ page_cache_release(page);
}
return 0;
git://git.onelab.eu / linux-2.6.git / blobdiff