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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
3 file Documentation/scsi/st.txt for more information.
4
5 History:
6 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
7 Contribution and ideas from several people including (in alphabetical
8 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
9 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
10 Michael Schaefer, J"org Weule, and Eric Youngdale.
11
Kai Makisara3e51d3c2010-10-09 00:17:56 +030012 Copyright 1992 - 2010 Kai Makisara
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 email Kai.Makisara@kolumbus.fi
14
15 Some small formal changes - aeb, 950809
16
17 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
18 */
19
Kai Makisara373daac2010-12-20 18:43:39 +020020static const char *verstr = "20101219";
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22#include <linux/module.h>
23
24#include <linux/fs.h>
25#include <linux/kernel.h>
26#include <linux/sched.h>
27#include <linux/mm.h>
28#include <linux/init.h>
29#include <linux/string.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090030#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/errno.h>
32#include <linux/mtio.h>
Kai Makisara 16c4b3e2005-05-01 18:11:55 +030033#include <linux/cdrom.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/ioctl.h>
35#include <linux/fcntl.h>
36#include <linux/spinlock.h>
37#include <linux/blkdev.h>
38#include <linux/moduleparam.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/cdev.h>
Jeff Mahoney6c648d92012-08-18 15:20:39 -040040#include <linux/idr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/delay.h>
Arjan van de Ven0b950672006-01-11 13:16:10 +010042#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44#include <asm/uaccess.h>
45#include <asm/dma.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47#include <scsi/scsi.h>
48#include <scsi/scsi_dbg.h>
49#include <scsi/scsi_device.h>
50#include <scsi/scsi_driver.h>
51#include <scsi/scsi_eh.h>
52#include <scsi/scsi_host.h>
53#include <scsi/scsi_ioctl.h>
Kai Makisara 16c4b3e2005-05-01 18:11:55 +030054#include <scsi/sg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56
57/* The driver prints some debugging information on the console if DEBUG
58 is defined and non-zero. */
Laurence Oberman2bec7082014-10-19 09:44:25 -040059#define DEBUG 1
60#define NO_DEBUG 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +020062#define ST_DEB_MSG KERN_NOTICE
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#if DEBUG
64/* The message level for the debug messages is currently set to KERN_NOTICE
65 so that people can easily see the messages. Later when the debugging messages
66 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#define DEB(a) a
68#define DEBC(a) if (debugging) { a ; }
69#else
70#define DEB(a)
71#define DEBC(a)
72#endif
73
74#define ST_KILOBYTE 1024
75
76#include "st_options.h"
77#include "st.h"
78
79static int buffer_kbs;
80static int max_sg_segs;
81static int try_direct_io = TRY_DIRECT_IO;
82static int try_rdio = 1;
83static int try_wdio = 1;
Laurence Oberman2bec7082014-10-19 09:44:25 -040084static int debug_flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Jeff Mahoneyaf237822012-08-18 15:20:37 -040086static struct class st_sysfs_class;
Greg Kroah-Hartmanc69c6be2013-07-24 15:05:29 -070087static const struct attribute_group *st_dev_groups[];
Seymour, Shane M442d7562015-06-23 08:11:00 +000088static const struct attribute_group *st_drv_groups[];
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90MODULE_AUTHOR("Kai Makisara");
Rene Hermanf018fa52006-03-08 00:14:20 -080091MODULE_DESCRIPTION("SCSI tape (st) driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070092MODULE_LICENSE("GPL");
Rene Hermanf018fa52006-03-08 00:14:20 -080093MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +040094MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96/* Set 'perm' (4th argument) to 0 to disable module_param's definition
97 * of sysfs parameters (which module_param doesn't yet support).
98 * Sysfs parameters defined explicitly later.
99 */
100module_param_named(buffer_kbs, buffer_kbs, int, 0);
101MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
102module_param_named(max_sg_segs, max_sg_segs, int, 0);
103MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
104module_param_named(try_direct_io, try_direct_io, int, 0);
105MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
Laurence Oberman2bec7082014-10-19 09:44:25 -0400106module_param_named(debug_flag, debug_flag, int, 0);
107MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110/* Extra parameters for testing */
111module_param_named(try_rdio, try_rdio, int, 0);
112MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
113module_param_named(try_wdio, try_wdio, int, 0);
114MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
115
116#ifndef MODULE
117static int write_threshold_kbs; /* retained for compatibility */
118static struct st_dev_parm {
119 char *name;
120 int *val;
121} parms[] __initdata = {
122 {
123 "buffer_kbs", &buffer_kbs
124 },
125 { /* Retained for compatibility with 2.4 */
126 "write_threshold_kbs", &write_threshold_kbs
127 },
128 {
129 "max_sg_segs", NULL
130 },
131 {
132 "try_direct_io", &try_direct_io
Laurence Oberman2bec7082014-10-19 09:44:25 -0400133 },
134 {
135 "debug_flag", &debug_flag
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 }
137};
138#endif
139
140/* Restrict the number of modes so that names for all are assigned */
141#if ST_NBR_MODES > 16
142#error "Maximum number of modes is 16"
143#endif
144/* Bit reversed order to get same names for same minors with all
145 mode counts */
Arjan van de Ven0ad78202005-11-28 16:22:25 +0100146static const char *st_formats[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 "", "r", "k", "s", "l", "t", "o", "u",
148 "m", "v", "p", "x", "a", "y", "q", "z"};
149
150/* The default definitions have been moved to st_options.h */
151
152#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
153
154/* The buffer size should fit into the 24 bits for length in the
155 6-byte SCSI read and write commands. */
156#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
157#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
158#endif
159
160static int debugging = DEBUG;
161
162#define MAX_RETRIES 0
163#define MAX_WRITE_RETRIES 0
164#define MAX_READY_RETRIES 0
165#define NO_TAPE NOT_READY
166
167#define ST_TIMEOUT (900 * HZ)
168#define ST_LONG_TIMEOUT (14000 * HZ)
169
170/* Remove mode bits and auto-rewind bit (7) */
171#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
172 (iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
173#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
174
175/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
176#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
177 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
178
179/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
180 24 bits) */
181#define SET_DENS_AND_BLK 0x10001
182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
184static int st_max_sg_segs = ST_MAX_SG;
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186static int modes_defined;
187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188static int enlarge_buffer(struct st_buffer *, int, int);
Kai Makisara40f6b362008-02-24 22:23:24 +0200189static void clear_buffer(struct st_buffer *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190static void normalize_buffer(struct st_buffer *);
191static int append_to_buffer(const char __user *, struct st_buffer *, int);
192static int from_buffer(struct st_buffer *, char __user *, int);
193static void move_buffer_data(struct st_buffer *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
FUJITA Tomonori66207422008-12-18 14:49:43 +0900195static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 unsigned long, size_t, int);
FUJITA Tomonori66207422008-12-18 14:49:43 +0900197static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199static int st_probe(struct device *);
200static int st_remove(struct device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202static struct scsi_driver st_template = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 .gendrv = {
204 .name = "st",
Christoph Hellwig3af6b352014-11-12 18:34:51 +0100205 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 .probe = st_probe,
207 .remove = st_remove,
Seymour, Shane M442d7562015-06-23 08:11:00 +0000208 .groups = st_drv_groups,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210};
211
212static int st_compression(struct scsi_tape *, int);
213
214static int find_partition(struct scsi_tape *);
215static int switch_partition(struct scsi_tape *);
216
217static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
218
Kai Makisaraf03a5672005-08-02 13:40:47 +0300219static void scsi_tape_release(struct kref *);
220
221#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
222
Arjan van de Ven0b950672006-01-11 13:16:10 +0100223static DEFINE_MUTEX(st_ref_mutex);
Jeff Mahoney6c648d92012-08-18 15:20:39 -0400224static DEFINE_SPINLOCK(st_index_lock);
225static DEFINE_SPINLOCK(st_use_lock);
226static DEFINE_IDR(st_index_idr);
227
Kai Makisaraf03a5672005-08-02 13:40:47 +0300228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230#include "osst_detect.h"
231#ifndef SIGS_FROM_OSST
232#define SIGS_FROM_OSST \
233 {"OnStream", "SC-", "", "osst"}, \
234 {"OnStream", "DI-", "", "osst"}, \
235 {"OnStream", "DP-", "", "osst"}, \
236 {"OnStream", "USB", "", "osst"}, \
237 {"OnStream", "FW-", "", "osst"}
238#endif
239
Kai Makisaraf03a5672005-08-02 13:40:47 +0300240static struct scsi_tape *scsi_tape_get(int dev)
241{
242 struct scsi_tape *STp = NULL;
243
Arjan van de Ven0b950672006-01-11 13:16:10 +0100244 mutex_lock(&st_ref_mutex);
Jeff Mahoney6c648d92012-08-18 15:20:39 -0400245 spin_lock(&st_index_lock);
Kai Makisaraf03a5672005-08-02 13:40:47 +0300246
Jeff Mahoney6c648d92012-08-18 15:20:39 -0400247 STp = idr_find(&st_index_idr, dev);
Kai Makisaraf03a5672005-08-02 13:40:47 +0300248 if (!STp) goto out;
249
250 kref_get(&STp->kref);
251
252 if (!STp->device)
253 goto out_put;
254
255 if (scsi_device_get(STp->device))
256 goto out_put;
257
258 goto out;
259
260out_put:
261 kref_put(&STp->kref, scsi_tape_release);
262 STp = NULL;
263out:
Jeff Mahoney6c648d92012-08-18 15:20:39 -0400264 spin_unlock(&st_index_lock);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100265 mutex_unlock(&st_ref_mutex);
Kai Makisaraf03a5672005-08-02 13:40:47 +0300266 return STp;
267}
268
269static void scsi_tape_put(struct scsi_tape *STp)
270{
271 struct scsi_device *sdev = STp->device;
272
Arjan van de Ven0b950672006-01-11 13:16:10 +0100273 mutex_lock(&st_ref_mutex);
Kai Makisaraf03a5672005-08-02 13:40:47 +0300274 kref_put(&STp->kref, scsi_tape_release);
275 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100276 mutex_unlock(&st_ref_mutex);
Kai Makisaraf03a5672005-08-02 13:40:47 +0300277}
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279struct st_reject_data {
280 char *vendor;
281 char *model;
282 char *rev;
283 char *driver_hint; /* Name of the correct driver, NULL if unknown */
284};
285
286static struct st_reject_data reject_list[] = {
287 /* {"XXX", "Yy-", "", NULL}, example */
288 SIGS_FROM_OSST,
289 {NULL, }};
290
291/* If the device signature is on the list of incompatible drives, the
292 function returns a pointer to the name of the correct driver (if known) */
293static char * st_incompatible(struct scsi_device* SDp)
294{
295 struct st_reject_data *rp;
296
297 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
298 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
299 !strncmp(rp->model, SDp->model, strlen(rp->model)) &&
300 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
301 if (rp->driver_hint)
302 return rp->driver_hint;
303 else
304 return "unknown";
305 }
306 return NULL;
307}
308
309
310static inline char *tape_name(struct scsi_tape *tape)
311{
312 return tape->disk->disk_name;
313}
314
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200315#define st_printk(prefix, t, fmt, a...) \
Hannes Reinecke22e0d992014-10-24 14:26:44 +0200316 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200317#ifdef DEBUG
318#define DEBC_printk(t, fmt, a...) \
319 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
320#else
321#define DEBC_printk(t, fmt, a...)
322#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Mike Christie8b05b772005-11-08 04:06:44 -0600324static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325{
326 const u8 *ucp;
Mike Christie8b05b772005-11-08 04:06:44 -0600327 const u8 *sense = SRpnt->sense;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Mike Christie8b05b772005-11-08 04:06:44 -0600329 s->have_sense = scsi_normalize_sense(SRpnt->sense,
330 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 s->flags = 0;
332
333 if (s->have_sense) {
334 s->deferred = 0;
335 s->remainder_valid =
336 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
337 switch (sense[0] & 0x7f) {
338 case 0x71:
339 s->deferred = 1;
340 case 0x70:
341 s->fixed_format = 1;
342 s->flags = sense[2] & 0xe0;
343 break;
344 case 0x73:
345 s->deferred = 1;
346 case 0x72:
347 s->fixed_format = 0;
348 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
349 s->flags = ucp ? (ucp[3] & 0xe0) : 0;
350 break;
351 }
352 }
353}
354
355
356/* Convert the result to success code */
Mike Christie8b05b772005-11-08 04:06:44 -0600357static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358{
Mike Christie8b05b772005-11-08 04:06:44 -0600359 int result = SRpnt->result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 u8 scode;
361 DEB(const char *stp;)
362 char *name = tape_name(STp);
363 struct st_cmdstatus *cmdstatp;
364
365 if (!result)
366 return 0;
367
368 cmdstatp = &STp->buffer->cmdstat;
Kai Makisaraf03a5672005-08-02 13:40:47 +0300369 st_analyze_sense(SRpnt, cmdstatp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
371 if (cmdstatp->have_sense)
372 scode = STp->buffer->cmdstat.sense_hdr.sense_key;
373 else
374 scode = 0;
375
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200376 DEB(
377 if (debugging) {
378 st_printk(ST_DEB_MSG, STp,
379 "Error: %x, cmd: %x %x %x %x %x %x\n", result,
380 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
381 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 if (cmdstatp->have_sense)
Hannes Reinecked811b842014-10-24 14:26:45 +0200383 __scsi_print_sense(STp->device, name,
384 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 } ) /* end DEB */
386 if (!debugging) { /* Abnormal conditions for tape */
387 if (!cmdstatp->have_sense)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200388 st_printk(KERN_WARNING, STp,
389 "Error %x (driver bt 0x%x, host bt 0x%x).\n",
390 result, driver_byte(result), host_byte(result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 else if (cmdstatp->have_sense &&
392 scode != NO_SENSE &&
393 scode != RECOVERED_ERROR &&
394 /* scode != UNIT_ATTENTION && */
395 scode != BLANK_CHECK &&
396 scode != VOLUME_OVERFLOW &&
Mike Christie8b05b772005-11-08 04:06:44 -0600397 SRpnt->cmd[0] != MODE_SENSE &&
398 SRpnt->cmd[0] != TEST_UNIT_READY) {
Luben Tuikov4e73ea72006-07-07 00:02:18 -0700399
Hannes Reinecked811b842014-10-24 14:26:45 +0200400 __scsi_print_sense(STp->device, name,
401 SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 }
403 }
404
405 if (cmdstatp->fixed_format &&
406 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
407 if (STp->cln_sense_value)
Mike Christie8b05b772005-11-08 04:06:44 -0600408 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 STp->cln_sense_mask) == STp->cln_sense_value);
410 else
Mike Christie8b05b772005-11-08 04:06:44 -0600411 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 STp->cln_sense_mask) != 0);
413 }
414 if (cmdstatp->have_sense &&
415 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
416 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
417
418 STp->pos_unknown |= STp->device->was_reset;
419
420 if (cmdstatp->have_sense &&
421 scode == RECOVERED_ERROR
422#if ST_RECOVERED_WRITE_FATAL
Mike Christie8b05b772005-11-08 04:06:44 -0600423 && SRpnt->cmd[0] != WRITE_6
424 && SRpnt->cmd[0] != WRITE_FILEMARKS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425#endif
426 ) {
427 STp->recover_count++;
428 STp->recover_reg++;
429
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200430 DEB(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (debugging) {
Mike Christie8b05b772005-11-08 04:06:44 -0600432 if (SRpnt->cmd[0] == READ_6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 stp = "read";
Mike Christie8b05b772005-11-08 04:06:44 -0600434 else if (SRpnt->cmd[0] == WRITE_6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 stp = "write";
436 else
437 stp = "ioctl";
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200438 st_printk(ST_DEB_MSG, STp,
439 "Recovered %s error (%d).\n",
440 stp, STp->recover_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 } ) /* end DEB */
442
443 if (cmdstatp->flags == 0)
444 return 0;
445 }
446 return (-EIO);
447}
448
FUJITA Tomonori4deba242008-12-05 15:25:20 +0900449static struct st_request *st_allocate_request(struct scsi_tape *stp)
Mike Christie8b05b772005-11-08 04:06:44 -0600450{
FUJITA Tomonori4deba242008-12-05 15:25:20 +0900451 struct st_request *streq;
452
453 streq = kzalloc(sizeof(*streq), GFP_KERNEL);
454 if (streq)
455 streq->stp = stp;
456 else {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200457 st_printk(KERN_ERR, stp,
458 "Can't get SCSI request.\n");
FUJITA Tomonori4deba242008-12-05 15:25:20 +0900459 if (signal_pending(current))
460 stp->buffer->syscall_result = -EINTR;
461 else
462 stp->buffer->syscall_result = -EBUSY;
463 }
464
465 return streq;
Mike Christie8b05b772005-11-08 04:06:44 -0600466}
467
468static void st_release_request(struct st_request *streq)
469{
470 kfree(streq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
Seymour, Shane M05545c92015-05-06 01:37:20 +0000473static void st_do_stats(struct scsi_tape *STp, struct request *req)
474{
475 ktime_t now;
476
477 now = ktime_get();
478 if (req->cmd[0] == WRITE_6) {
479 now = ktime_sub(now, STp->stats->write_time);
480 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
481 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
482 atomic64_inc(&STp->stats->write_cnt);
483 if (req->errors) {
484 atomic64_add(atomic_read(&STp->stats->last_write_size)
485 - STp->buffer->cmdstat.residual,
486 &STp->stats->write_byte_cnt);
487 if (STp->buffer->cmdstat.residual > 0)
488 atomic64_inc(&STp->stats->resid_cnt);
489 } else
490 atomic64_add(atomic_read(&STp->stats->last_write_size),
491 &STp->stats->write_byte_cnt);
492 } else if (req->cmd[0] == READ_6) {
493 now = ktime_sub(now, STp->stats->read_time);
494 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
495 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
496 atomic64_inc(&STp->stats->read_cnt);
497 if (req->errors) {
498 atomic64_add(atomic_read(&STp->stats->last_read_size)
499 - STp->buffer->cmdstat.residual,
500 &STp->stats->read_byte_cnt);
501 if (STp->buffer->cmdstat.residual > 0)
502 atomic64_inc(&STp->stats->resid_cnt);
503 } else
504 atomic64_add(atomic_read(&STp->stats->last_read_size),
505 &STp->stats->read_byte_cnt);
506 } else {
507 now = ktime_sub(now, STp->stats->other_time);
508 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
509 atomic64_inc(&STp->stats->other_cnt);
510 }
511 atomic64_dec(&STp->stats->in_flight);
512}
513
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900514static void st_scsi_execute_end(struct request *req, int uptodate)
515{
516 struct st_request *SRpnt = req->end_io_data;
517 struct scsi_tape *STp = SRpnt->stp;
Petr Uzelc68bf8e2011-10-21 13:31:09 +0200518 struct bio *tmp;
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900519
520 STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
Tejun Heoc3a4d782009-05-07 22:24:37 +0900521 STp->buffer->cmdstat.residual = req->resid_len;
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900522
Seymour, Shane M05545c92015-05-06 01:37:20 +0000523 st_do_stats(STp, req);
524
Petr Uzelc68bf8e2011-10-21 13:31:09 +0200525 tmp = SRpnt->bio;
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900526 if (SRpnt->waiting)
527 complete(SRpnt->waiting);
528
Petr Uzelc68bf8e2011-10-21 13:31:09 +0200529 blk_rq_unmap_user(tmp);
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900530 __blk_put_request(req->q, req);
531}
532
533static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
534 int data_direction, void *buffer, unsigned bufflen,
535 int timeout, int retries)
536{
537 struct request *req;
538 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
539 int err = 0;
540 int write = (data_direction == DMA_TO_DEVICE);
Seymour, Shane M05545c92015-05-06 01:37:20 +0000541 struct scsi_tape *STp = SRpnt->stp;
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900542
543 req = blk_get_request(SRpnt->stp->device->request_queue, write,
544 GFP_KERNEL);
Joe Lawrencea492f072014-08-28 08:15:21 -0600545 if (IS_ERR(req))
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900546 return DRIVER_ERROR << 24;
547
Jens Axboef27b0872014-06-06 07:57:37 -0600548 blk_rq_set_block_pc(req);
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900549 req->cmd_flags |= REQ_QUIET;
550
551 mdata->null_mapped = 1;
552
Kai Makisara02ae2c02008-12-18 14:49:50 +0900553 if (bufflen) {
554 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
555 GFP_KERNEL);
556 if (err) {
557 blk_put_request(req);
558 return DRIVER_ERROR << 24;
559 }
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900560 }
561
Seymour, Shane M05545c92015-05-06 01:37:20 +0000562 atomic64_inc(&STp->stats->in_flight);
563 if (cmd[0] == WRITE_6) {
564 atomic_set(&STp->stats->last_write_size, bufflen);
565 STp->stats->write_time = ktime_get();
566 } else if (cmd[0] == READ_6) {
567 atomic_set(&STp->stats->last_read_size, bufflen);
568 STp->stats->read_time = ktime_get();
569 } else {
570 STp->stats->other_time = ktime_get();
571 }
572
FUJITA Tomonori13b53b42008-12-18 14:49:41 +0900573 SRpnt->bio = req->bio;
574 req->cmd_len = COMMAND_SIZE(cmd[0]);
575 memset(req->cmd, 0, BLK_MAX_CDB);
576 memcpy(req->cmd, cmd, req->cmd_len);
577 req->sense = SRpnt->sense;
578 req->sense_len = 0;
579 req->timeout = timeout;
580 req->retries = retries;
581 req->end_io_data = SRpnt;
582
583 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
584 return 0;
585}
586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587/* Do the scsi command. Waits until command performed if do_wait is true.
588 Otherwise write_behind_check() is used to check that the command
589 has finished. */
Mike Christie8b05b772005-11-08 04:06:44 -0600590static struct st_request *
591st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 int bytes, int direction, int timeout, int retries, int do_wait)
593{
Kai Makisaraf03a5672005-08-02 13:40:47 +0300594 struct completion *waiting;
FUJITA Tomonori6d476262008-12-18 14:49:42 +0900595 struct rq_map_data *mdata = &STp->buffer->map_data;
596 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
Kai Makisaraf03a5672005-08-02 13:40:47 +0300598 /* if async, make sure there's no command outstanding */
599 if (!do_wait && ((STp->buffer)->last_SRpnt)) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200600 st_printk(KERN_ERR, STp,
601 "Async command already active.\n");
Kai Makisaraf03a5672005-08-02 13:40:47 +0300602 if (signal_pending(current))
603 (STp->buffer)->syscall_result = (-EINTR);
604 else
605 (STp->buffer)->syscall_result = (-EBUSY);
606 return NULL;
607 }
608
FUJITA Tomonori4deba242008-12-05 15:25:20 +0900609 if (!SRpnt) {
610 SRpnt = st_allocate_request(STp);
611 if (!SRpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 }
614
Kai Makisaraf03a5672005-08-02 13:40:47 +0300615 /* If async IO, set last_SRpnt. This ptr tells write_behind_check
616 which IO is outstanding. It's nulled out when the IO completes. */
617 if (!do_wait)
618 (STp->buffer)->last_SRpnt = SRpnt;
619
620 waiting = &STp->wait;
621 init_completion(waiting);
Mike Christie8b05b772005-11-08 04:06:44 -0600622 SRpnt->waiting = waiting;
623
FUJITA Tomonori66207422008-12-18 14:49:43 +0900624 if (STp->buffer->do_dio) {
FUJITA Tomonoric982c362009-11-26 09:24:13 +0900625 mdata->page_order = 0;
FUJITA Tomonori66207422008-12-18 14:49:43 +0900626 mdata->nr_entries = STp->buffer->sg_segs;
627 mdata->pages = STp->buffer->mapped_pages;
628 } else {
FUJITA Tomonoric982c362009-11-26 09:24:13 +0900629 mdata->page_order = STp->buffer->reserved_page_order;
FUJITA Tomonori6d476262008-12-18 14:49:42 +0900630 mdata->nr_entries =
631 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
FUJITA Tomonoric982c362009-11-26 09:24:13 +0900632 mdata->pages = STp->buffer->reserved_pages;
633 mdata->offset = 0;
FUJITA Tomonori6d476262008-12-18 14:49:42 +0900634 }
635
Mike Christie8b05b772005-11-08 04:06:44 -0600636 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 STp->buffer->cmdstat.have_sense = 0;
Mike Christie8b05b772005-11-08 04:06:44 -0600638 STp->buffer->syscall_result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
FUJITA Tomonori66207422008-12-18 14:49:43 +0900640 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
641 retries);
FUJITA Tomonori6d476262008-12-18 14:49:42 +0900642 if (ret) {
Mike Christie8b05b772005-11-08 04:06:44 -0600643 /* could not allocate the buffer or request was too large */
644 (STp->buffer)->syscall_result = (-EBUSY);
Kai Makisara787926b2005-11-13 10:04:44 +0200645 (STp->buffer)->last_SRpnt = NULL;
FUJITA Tomonori6d476262008-12-18 14:49:42 +0900646 } else if (do_wait) {
Kai Makisaraf03a5672005-08-02 13:40:47 +0300647 wait_for_completion(waiting);
Mike Christie8b05b772005-11-08 04:06:44 -0600648 SRpnt->waiting = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
650 }
Mike Christie8b05b772005-11-08 04:06:44 -0600651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 return SRpnt;
653}
654
655
656/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
657 write has been correct but EOM early warning reached, -EIO if write ended in
658 error or zero if write successful. Asynchronous writes are used only in
659 variable block mode. */
660static int write_behind_check(struct scsi_tape * STp)
661{
662 int retval = 0;
663 struct st_buffer *STbuffer;
664 struct st_partstat *STps;
665 struct st_cmdstatus *cmdstatp;
Mike Christie8b05b772005-11-08 04:06:44 -0600666 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 STbuffer = STp->buffer;
669 if (!STbuffer->writing)
670 return 0;
671
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200672 DEB(
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 if (STp->write_pending)
674 STp->nbr_waits++;
675 else
676 STp->nbr_finished++;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200677 ) /* end DEB */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679 wait_for_completion(&(STp->wait));
Kai Makisaraf03a5672005-08-02 13:40:47 +0300680 SRpnt = STbuffer->last_SRpnt;
681 STbuffer->last_SRpnt = NULL;
Mike Christie8b05b772005-11-08 04:06:44 -0600682 SRpnt->waiting = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
Kai Makisaraf03a5672005-08-02 13:40:47 +0300684 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
Mike Christie8b05b772005-11-08 04:06:44 -0600685 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
687 STbuffer->buffer_bytes -= STbuffer->writing;
688 STps = &(STp->ps[STp->partition]);
689 if (STps->drv_block >= 0) {
690 if (STp->block_size == 0)
691 STps->drv_block++;
692 else
693 STps->drv_block += STbuffer->writing / STp->block_size;
694 }
695
696 cmdstatp = &STbuffer->cmdstat;
697 if (STbuffer->syscall_result) {
698 retval = -EIO;
699 if (cmdstatp->have_sense && !cmdstatp->deferred &&
700 (cmdstatp->flags & SENSE_EOM) &&
701 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
702 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
703 /* EOM at write-behind, has all data been written? */
704 if (!cmdstatp->remainder_valid ||
705 cmdstatp->uremainder64 == 0)
706 retval = -ENOSPC;
707 }
708 if (retval == -EIO)
709 STps->drv_block = -1;
710 }
711 STbuffer->writing = 0;
712
713 DEB(if (debugging && retval)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200714 st_printk(ST_DEB_MSG, STp,
715 "Async write error %x, return value %d.\n",
716 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 return retval;
719}
720
721
722/* Step over EOF if it has been inadvertently crossed (ioctl not used because
723 it messes up the block number). */
724static int cross_eof(struct scsi_tape * STp, int forward)
725{
Mike Christie8b05b772005-11-08 04:06:44 -0600726 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 unsigned char cmd[MAX_COMMAND_SIZE];
728
729 cmd[0] = SPACE;
730 cmd[1] = 0x01; /* Space FileMarks */
731 if (forward) {
732 cmd[2] = cmd[3] = 0;
733 cmd[4] = 1;
734 } else
735 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
736 cmd[5] = 0;
737
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200738 DEBC_printk(STp, "Stepping over filemark %s.\n",
739 forward ? "forward" : "backward");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Kai Makisara02ae2c02008-12-18 14:49:50 +0900741 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
742 STp->device->request_queue->rq_timeout,
743 MAX_RETRIES, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 if (!SRpnt)
Kai Makisara02ae2c02008-12-18 14:49:50 +0900745 return (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Kai Makisara02ae2c02008-12-18 14:49:50 +0900747 st_release_request(SRpnt);
748 SRpnt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
750 if ((STp->buffer)->cmdstat.midlevel_result != 0)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200751 st_printk(KERN_ERR, STp,
752 "Stepping over filemark %s failed.\n",
753 forward ? "forward" : "backward");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
Kai Makisara02ae2c02008-12-18 14:49:50 +0900755 return (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756}
757
758
759/* Flush the write buffer (never need to write if variable blocksize). */
Adrian Bunk8ef8d592008-04-14 17:17:16 +0300760static int st_flush_write_buffer(struct scsi_tape * STp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
Kai Makisara786231a2008-07-11 15:06:40 +0300762 int transfer, blks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 int result;
764 unsigned char cmd[MAX_COMMAND_SIZE];
Mike Christie8b05b772005-11-08 04:06:44 -0600765 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 struct st_partstat *STps;
767
768 result = write_behind_check(STp);
769 if (result)
770 return result;
771
772 result = 0;
773 if (STp->dirty == 1) {
774
Kai Makisara786231a2008-07-11 15:06:40 +0300775 transfer = STp->buffer->buffer_bytes;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200776 DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 memset(cmd, 0, MAX_COMMAND_SIZE);
779 cmd[0] = WRITE_6;
780 cmd[1] = 1;
781 blks = transfer / STp->block_size;
782 cmd[2] = blks >> 16;
783 cmd[3] = blks >> 8;
784 cmd[4] = blks;
785
786 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
James Bottomleya02488e2008-11-30 10:36:26 -0600787 STp->device->request_queue->rq_timeout,
788 MAX_WRITE_RETRIES, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 if (!SRpnt)
790 return (STp->buffer)->syscall_result;
791
792 STps = &(STp->ps[STp->partition]);
793 if ((STp->buffer)->syscall_result != 0) {
794 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
795
796 if (cmdstatp->have_sense && !cmdstatp->deferred &&
797 (cmdstatp->flags & SENSE_EOM) &&
798 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
799 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
800 (!cmdstatp->remainder_valid ||
801 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
802 STp->dirty = 0;
803 (STp->buffer)->buffer_bytes = 0;
804 if (STps->drv_block >= 0)
805 STps->drv_block += blks;
806 result = (-ENOSPC);
807 } else {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200808 st_printk(KERN_ERR, STp, "Error on flush.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 STps->drv_block = (-1);
810 result = (-EIO);
811 }
812 } else {
813 if (STps->drv_block >= 0)
814 STps->drv_block += blks;
815 STp->dirty = 0;
816 (STp->buffer)->buffer_bytes = 0;
817 }
Mike Christie8b05b772005-11-08 04:06:44 -0600818 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 SRpnt = NULL;
820 }
821 return result;
822}
823
824
825/* Flush the tape buffer. The tape will be positioned correctly unless
826 seek_next is true. */
827static int flush_buffer(struct scsi_tape *STp, int seek_next)
828{
829 int backspace, result;
830 struct st_buffer *STbuffer;
831 struct st_partstat *STps;
832
833 STbuffer = STp->buffer;
834
835 /*
836 * If there was a bus reset, block further access
837 * to this device.
838 */
839 if (STp->pos_unknown)
840 return (-EIO);
841
842 if (STp->ready != ST_READY)
843 return 0;
844 STps = &(STp->ps[STp->partition]);
845 if (STps->rw == ST_WRITING) /* Writing */
Adrian Bunk8ef8d592008-04-14 17:17:16 +0300846 return st_flush_write_buffer(STp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
848 if (STp->block_size == 0)
849 return 0;
850
851 backspace = ((STp->buffer)->buffer_bytes +
852 (STp->buffer)->read_pointer) / STp->block_size -
853 ((STp->buffer)->read_pointer + STp->block_size - 1) /
854 STp->block_size;
855 (STp->buffer)->buffer_bytes = 0;
856 (STp->buffer)->read_pointer = 0;
857 result = 0;
858 if (!seek_next) {
859 if (STps->eof == ST_FM_HIT) {
860 result = cross_eof(STp, 0); /* Back over the EOF hit */
861 if (!result)
862 STps->eof = ST_NOEOF;
863 else {
864 if (STps->drv_file >= 0)
865 STps->drv_file++;
866 STps->drv_block = 0;
867 }
868 }
869 if (!result && backspace > 0)
870 result = st_int_ioctl(STp, MTBSR, backspace);
871 } else if (STps->eof == ST_FM_HIT) {
872 if (STps->drv_file >= 0)
873 STps->drv_file++;
874 STps->drv_block = 0;
875 STps->eof = ST_NOEOF;
876 }
877 return result;
878
879}
880
881/* Set the mode parameters */
882static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
883{
884 int set_it = 0;
885 unsigned long arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
887 if (!STp->density_changed &&
888 STm->default_density >= 0 &&
889 STm->default_density != STp->density) {
890 arg = STm->default_density;
891 set_it = 1;
892 } else
893 arg = STp->density;
894 arg <<= MT_ST_DENSITY_SHIFT;
895 if (!STp->blksize_changed &&
896 STm->default_blksize >= 0 &&
897 STm->default_blksize != STp->block_size) {
898 arg |= STm->default_blksize;
899 set_it = 1;
900 } else
901 arg |= STp->block_size;
902 if (set_it &&
903 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200904 st_printk(KERN_WARNING, STp,
905 "Can't set default block size to %d bytes "
906 "and density %x.\n",
907 STm->default_blksize, STm->default_density);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 if (modes_defined)
909 return (-EINVAL);
910 }
911 return 0;
912}
913
914
Mike Christie8b05b772005-11-08 04:06:44 -0600915/* Lock or unlock the drive door. Don't use when st_request allocated. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916static int do_door_lock(struct scsi_tape * STp, int do_lock)
917{
Christoph Hellwigdccfa682014-10-11 15:59:39 +0200918 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +0200920 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
Christoph Hellwigdccfa682014-10-11 15:59:39 +0200921
922 retval = scsi_set_medium_removal(STp->device,
923 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
924 if (!retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
Christoph Hellwigdccfa682014-10-11 15:59:39 +0200926 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 STp->door_locked = ST_LOCK_FAILS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 return retval;
929}
930
931
932/* Set the internal state after reset */
933static void reset_state(struct scsi_tape *STp)
934{
935 int i;
936 struct st_partstat *STps;
937
938 STp->pos_unknown = 0;
939 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
940 STps = &(STp->ps[i]);
941 STps->rw = ST_IDLE;
942 STps->eof = ST_NOEOF;
943 STps->at_sm = 0;
944 STps->last_block_valid = 0;
945 STps->drv_block = -1;
946 STps->drv_file = -1;
947 }
948 if (STp->can_partitions) {
949 STp->partition = find_partition(STp);
950 if (STp->partition < 0)
951 STp->partition = 0;
952 STp->new_partition = STp->partition;
953 }
954}
955
956/* Test if the drive is ready. Returns either one of the codes below or a negative system
957 error code. */
958#define CHKRES_READY 0
959#define CHKRES_NEW_SESSION 1
960#define CHKRES_NOT_READY 2
961#define CHKRES_NO_TAPE 3
962
963#define MAX_ATTENTIONS 10
964
965static int test_ready(struct scsi_tape *STp, int do_wait)
966{
967 int attentions, waits, max_wait, scode;
968 int retval = CHKRES_READY, new_session = 0;
969 unsigned char cmd[MAX_COMMAND_SIZE];
Kai Makisara02ae2c02008-12-18 14:49:50 +0900970 struct st_request *SRpnt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
972
973 max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
974
975 for (attentions=waits=0; ; ) {
976 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
977 cmd[0] = TEST_UNIT_READY;
Kai Makisara02ae2c02008-12-18 14:49:50 +0900978 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
979 STp->long_timeout, MAX_READY_RETRIES, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
Kai Makisara02ae2c02008-12-18 14:49:50 +0900981 if (!SRpnt) {
982 retval = (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 break;
Kai Makisara02ae2c02008-12-18 14:49:50 +0900984 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
986 if (cmdstatp->have_sense) {
987
988 scode = cmdstatp->sense_hdr.sense_key;
989
990 if (scode == UNIT_ATTENTION) { /* New media? */
991 new_session = 1;
992 if (attentions < MAX_ATTENTIONS) {
993 attentions++;
994 continue;
995 }
996 else {
997 retval = (-EIO);
998 break;
999 }
1000 }
1001
1002 if (scode == NOT_READY) {
1003 if (waits < max_wait) {
1004 if (msleep_interruptible(1000)) {
1005 retval = (-EINTR);
1006 break;
1007 }
1008 waits++;
1009 continue;
1010 }
1011 else {
1012 if ((STp->device)->scsi_level >= SCSI_2 &&
1013 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
1014 retval = CHKRES_NO_TAPE;
1015 else
1016 retval = CHKRES_NOT_READY;
1017 break;
1018 }
1019 }
1020 }
1021
1022 retval = (STp->buffer)->syscall_result;
1023 if (!retval)
1024 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
1025 break;
1026 }
1027
Kai Makisara02ae2c02008-12-18 14:49:50 +09001028 if (SRpnt != NULL)
1029 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 return retval;
1031}
1032
1033
1034/* See if the drive is ready and gather information about the tape. Return values:
1035 < 0 negative error code from errno.h
1036 0 drive ready
1037 1 drive not ready (possibly no tape)
1038*/
1039static int check_tape(struct scsi_tape *STp, struct file *filp)
1040{
1041 int i, retval, new_session = 0, do_wait;
1042 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
1043 unsigned short st_flags = filp->f_flags;
Mike Christie8b05b772005-11-08 04:06:44 -06001044 struct st_request *SRpnt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 struct st_modedef *STm;
1046 struct st_partstat *STps;
Al Viro496ad9a2013-01-23 17:07:38 -05001047 struct inode *inode = file_inode(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 int mode = TAPE_MODE(inode);
1049
1050 STp->ready = ST_READY;
1051
1052 if (mode != STp->current_mode) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001053 DEBC_printk(STp, "Mode change from %d to %d.\n",
1054 STp->current_mode, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 new_session = 1;
1056 STp->current_mode = mode;
1057 }
1058 STm = &(STp->modes[STp->current_mode]);
1059
1060 saved_cleaning = STp->cleaning_req;
1061 STp->cleaning_req = 0;
1062
1063 do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
1064 retval = test_ready(STp, do_wait);
1065
1066 if (retval < 0)
1067 goto err_out;
1068
1069 if (retval == CHKRES_NEW_SESSION) {
1070 STp->pos_unknown = 0;
1071 STp->partition = STp->new_partition = 0;
1072 if (STp->can_partitions)
1073 STp->nbr_partitions = 1; /* This guess will be updated later
1074 if necessary */
1075 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1076 STps = &(STp->ps[i]);
1077 STps->rw = ST_IDLE;
1078 STps->eof = ST_NOEOF;
1079 STps->at_sm = 0;
1080 STps->last_block_valid = 0;
1081 STps->drv_block = 0;
1082 STps->drv_file = 0;
1083 }
1084 new_session = 1;
1085 }
1086 else {
1087 STp->cleaning_req |= saved_cleaning;
1088
1089 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
1090 if (retval == CHKRES_NO_TAPE)
1091 STp->ready = ST_NO_TAPE;
1092 else
1093 STp->ready = ST_NOT_READY;
1094
1095 STp->density = 0; /* Clear the erroneous "residue" */
1096 STp->write_prot = 0;
1097 STp->block_size = 0;
1098 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
1099 STp->partition = STp->new_partition = 0;
1100 STp->door_locked = ST_UNLOCKED;
1101 return CHKRES_NOT_READY;
1102 }
1103 }
1104
1105 if (STp->omit_blklims)
1106 STp->min_block = STp->max_block = (-1);
1107 else {
1108 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1109 cmd[0] = READ_BLOCK_LIMITS;
1110
Kai Makisara02ae2c02008-12-18 14:49:50 +09001111 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
1112 STp->device->request_queue->rq_timeout,
1113 MAX_READY_RETRIES, 1);
1114 if (!SRpnt) {
1115 retval = (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 goto err_out;
1117 }
1118
Mike Christie8b05b772005-11-08 04:06:44 -06001119 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 STp->max_block = ((STp->buffer)->b_data[1] << 16) |
1121 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
1122 STp->min_block = ((STp->buffer)->b_data[4] << 8) |
1123 (STp->buffer)->b_data[5];
1124 if ( DEB( debugging || ) !STp->inited)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001125 st_printk(KERN_INFO, STp,
1126 "Block limits %d - %d bytes.\n",
1127 STp->min_block, STp->max_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 } else {
1129 STp->min_block = STp->max_block = (-1);
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001130 DEBC_printk(STp, "Can't read block limits.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 }
1132 }
1133
1134 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
1135 cmd[0] = MODE_SENSE;
1136 cmd[4] = 12;
1137
Kai Makisara02ae2c02008-12-18 14:49:50 +09001138 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
1139 STp->device->request_queue->rq_timeout,
1140 MAX_READY_RETRIES, 1);
1141 if (!SRpnt) {
1142 retval = (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 goto err_out;
1144 }
1145
1146 if ((STp->buffer)->syscall_result != 0) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001147 DEBC_printk(STp, "No Mode Sense.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
1149 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */
1150 STp->drv_write_prot = 0;
1151 } else {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001152 DEBC_printk(STp,"Mode sense. Length %d, "
1153 "medium %x, WBS %x, BLL %d\n",
1154 (STp->buffer)->b_data[0],
1155 (STp->buffer)->b_data[1],
1156 (STp->buffer)->b_data[2],
1157 (STp->buffer)->b_data[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158
1159 if ((STp->buffer)->b_data[3] >= 8) {
1160 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
1161 STp->density = (STp->buffer)->b_data[4];
1162 STp->block_size = (STp->buffer)->b_data[9] * 65536 +
1163 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001164 DEBC_printk(STp, "Density %x, tape length: %x, "
1165 "drv buffer: %d\n",
1166 STp->density,
1167 (STp->buffer)->b_data[5] * 65536 +
1168 (STp->buffer)->b_data[6] * 256 +
1169 (STp->buffer)->b_data[7],
1170 STp->drv_buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 }
1172 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
Lee Duncanc743e442012-03-01 12:41:01 -08001173 if (!STp->drv_buffer && STp->immediate_filemark) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001174 st_printk(KERN_WARNING, STp,
1175 "non-buffered tape: disabling "
1176 "writing immediate filemarks\n");
Lee Duncanc743e442012-03-01 12:41:01 -08001177 STp->immediate_filemark = 0;
1178 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 }
Mike Christie8b05b772005-11-08 04:06:44 -06001180 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 SRpnt = NULL;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001182 STp->inited = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
1184 if (STp->block_size > 0)
1185 (STp->buffer)->buffer_blocks =
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001186 (STp->buffer)->buffer_size / STp->block_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 else
1188 (STp->buffer)->buffer_blocks = 1;
1189 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
1190
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001191 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
1192 STp->block_size, (STp->buffer)->buffer_size,
1193 (STp->buffer)->buffer_blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
1195 if (STp->drv_write_prot) {
1196 STp->write_prot = 1;
1197
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001198 DEBC_printk(STp, "Write protected\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199
1200 if (do_wait &&
1201 ((st_flags & O_ACCMODE) == O_WRONLY ||
1202 (st_flags & O_ACCMODE) == O_RDWR)) {
1203 retval = (-EROFS);
1204 goto err_out;
1205 }
1206 }
1207
1208 if (STp->can_partitions && STp->nbr_partitions < 1) {
1209 /* This code is reached when the device is opened for the first time
1210 after the driver has been initialized with tape in the drive and the
1211 partition support has been enabled. */
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001212 DEBC_printk(STp, "Updating partition number in status.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 if ((STp->partition = find_partition(STp)) < 0) {
1214 retval = STp->partition;
1215 goto err_out;
1216 }
1217 STp->new_partition = STp->partition;
1218 STp->nbr_partitions = 1; /* This guess will be updated when necessary */
1219 }
1220
1221 if (new_session) { /* Change the drive parameters for the new mode */
1222 STp->density_changed = STp->blksize_changed = 0;
1223 STp->compression_changed = 0;
1224 if (!(STm->defaults_for_writes) &&
1225 (retval = set_mode_densblk(STp, STm)) < 0)
1226 goto err_out;
1227
1228 if (STp->default_drvbuffer != 0xff) {
1229 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001230 st_printk(KERN_WARNING, STp,
1231 "Can't set default drive "
1232 "buffering to %d.\n",
1233 STp->default_drvbuffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 }
1235 }
1236
1237 return CHKRES_READY;
1238
1239 err_out:
1240 return retval;
1241}
1242
1243
Jonathan Corbetb3369c62008-05-15 16:08:15 -06001244 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 module count. */
1246static int st_open(struct inode *inode, struct file *filp)
1247{
1248 int i, retval = (-EIO);
Oliver Neukum46a243f2012-01-15 00:16:51 +01001249 int resumed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 struct scsi_tape *STp;
1251 struct st_partstat *STps;
1252 int dev = TAPE_NR(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
1254 /*
1255 * We really want to do nonseekable_open(inode, filp); here, but some
1256 * versions of tar incorrectly call lseek on tapes and bail out if that
1257 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1258 */
1259 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
1260
Jonathan Corbetb3369c62008-05-15 16:08:15 -06001261 if (!(STp = scsi_tape_get(dev))) {
Kai Makisaraf03a5672005-08-02 13:40:47 +03001262 return -ENXIO;
Jonathan Corbetb3369c62008-05-15 16:08:15 -06001263 }
Kai Makisaraf03a5672005-08-02 13:40:47 +03001264
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 filp->private_data = STp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266
Jeff Mahoney6c648d92012-08-18 15:20:39 -04001267 spin_lock(&st_use_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 if (STp->in_use) {
Jeff Mahoney6c648d92012-08-18 15:20:39 -04001269 spin_unlock(&st_use_lock);
Kai Makisaraf03a5672005-08-02 13:40:47 +03001270 scsi_tape_put(STp);
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001271 DEBC_printk(STp, "Device already in use.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 return (-EBUSY);
1273 }
1274
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 STp->in_use = 1;
Jeff Mahoney6c648d92012-08-18 15:20:39 -04001276 spin_unlock(&st_use_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
1278
Oliver Neukum46a243f2012-01-15 00:16:51 +01001279 if (scsi_autopm_get_device(STp->device) < 0) {
1280 retval = -EIO;
1281 goto err_out;
1282 }
1283 resumed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 if (!scsi_block_when_processing_errors(STp->device)) {
1285 retval = (-ENXIO);
1286 goto err_out;
1287 }
1288
1289 /* See that we have at least a one page buffer available */
1290 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001291 st_printk(KERN_WARNING, STp,
1292 "Can't allocate one page tape buffer.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 retval = (-EOVERFLOW);
1294 goto err_out;
1295 }
1296
Kai Makisara40f6b362008-02-24 22:23:24 +02001297 (STp->buffer)->cleared = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 (STp->buffer)->writing = 0;
1299 (STp->buffer)->syscall_result = 0;
1300
1301 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
1302
1303 STp->dirty = 0;
1304 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
1305 STps = &(STp->ps[i]);
1306 STps->rw = ST_IDLE;
1307 }
Kai Makisara9abe16c2007-02-03 13:21:29 +02001308 STp->try_dio_now = STp->try_dio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 STp->recover_count = 0;
1310 DEB( STp->nbr_waits = STp->nbr_finished = 0;
Kai Makisaradeee13d2008-02-22 20:11:21 +02001311 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
1313 retval = check_tape(STp, filp);
1314 if (retval < 0)
1315 goto err_out;
1316 if ((filp->f_flags & O_NONBLOCK) == 0 &&
1317 retval != CHKRES_READY) {
Kai Makisara413f7322006-10-05 22:59:46 +03001318 if (STp->ready == NO_TAPE)
1319 retval = (-ENOMEDIUM);
1320 else
1321 retval = (-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 goto err_out;
1323 }
1324 return 0;
1325
1326 err_out:
1327 normalize_buffer(STp->buffer);
Hannes Reinecke0644f532012-09-10 15:36:44 -07001328 spin_lock(&st_use_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 STp->in_use = 0;
Hannes Reinecke0644f532012-09-10 15:36:44 -07001330 spin_unlock(&st_use_lock);
Oliver Neukum46a243f2012-01-15 00:16:51 +01001331 if (resumed)
1332 scsi_autopm_put_device(STp->device);
Seymour, Shane Me7ac6c62015-07-02 12:01:10 +00001333 scsi_tape_put(STp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 return retval;
1335
1336}
1337
1338
1339/* Flush the tape buffer before close */
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -07001340static int st_flush(struct file *filp, fl_owner_t id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341{
1342 int result = 0, result2;
1343 unsigned char cmd[MAX_COMMAND_SIZE];
Mike Christie8b05b772005-11-08 04:06:44 -06001344 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 struct scsi_tape *STp = filp->private_data;
1346 struct st_modedef *STm = &(STp->modes[STp->current_mode]);
1347 struct st_partstat *STps = &(STp->ps[STp->partition]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348
1349 if (file_count(filp) > 1)
1350 return 0;
1351
1352 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
Adrian Bunk8ef8d592008-04-14 17:17:16 +03001353 result = st_flush_write_buffer(STp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 if (result != 0 && result != (-ENOSPC))
1355 goto out;
1356 }
1357
1358 if (STp->can_partitions &&
1359 (result2 = switch_partition(STp)) < 0) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001360 DEBC_printk(STp, "switch_partition at close failed.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 if (result == 0)
1362 result = result2;
1363 goto out;
1364 }
1365
1366 DEBC( if (STp->nbr_requests)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001367 st_printk(KERN_DEBUG, STp,
1368 "Number of r/w requests %d, dio used in %d, "
1369 "pages %d.\n", STp->nbr_requests, STp->nbr_dio,
1370 STp->nbr_pages));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371
1372 if (STps->rw == ST_WRITING && !STp->pos_unknown) {
1373 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1374
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001375#if DEBUG
1376 DEBC_printk(STp, "Async write waits %d, finished %d.\n",
1377 STp->nbr_waits, STp->nbr_finished);
1378#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 memset(cmd, 0, MAX_COMMAND_SIZE);
1380 cmd[0] = WRITE_FILEMARKS;
Lee Duncanc743e442012-03-01 12:41:01 -08001381 if (STp->immediate_filemark)
1382 cmd[1] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 cmd[4] = 1 + STp->two_fm;
1384
Kai Makisara02ae2c02008-12-18 14:49:50 +09001385 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
1386 STp->device->request_queue->rq_timeout,
1387 MAX_WRITE_RETRIES, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 if (!SRpnt) {
Kai Makisara02ae2c02008-12-18 14:49:50 +09001389 result = (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 goto out;
1391 }
1392
1393 if (STp->buffer->syscall_result == 0 ||
1394 (cmdstatp->have_sense && !cmdstatp->deferred &&
1395 (cmdstatp->flags & SENSE_EOM) &&
1396 (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
1397 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
1398 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
1399 /* Write successful at EOM */
Mike Christie8b05b772005-11-08 04:06:44 -06001400 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 SRpnt = NULL;
1402 if (STps->drv_file >= 0)
1403 STps->drv_file++;
1404 STps->drv_block = 0;
1405 if (STp->two_fm)
1406 cross_eof(STp, 0);
1407 STps->eof = ST_FM;
1408 }
1409 else { /* Write error */
Mike Christie8b05b772005-11-08 04:06:44 -06001410 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 SRpnt = NULL;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001412 st_printk(KERN_ERR, STp,
1413 "Error on write filemark.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 if (result == 0)
1415 result = (-EIO);
1416 }
1417
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001418 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 } else if (!STp->rew_at_close) {
1420 STps = &(STp->ps[STp->partition]);
1421 if (!STm->sysv || STps->rw != ST_READING) {
1422 if (STp->can_bsr)
1423 result = flush_buffer(STp, 0);
1424 else if (STps->eof == ST_FM_HIT) {
1425 result = cross_eof(STp, 0);
1426 if (result) {
1427 if (STps->drv_file >= 0)
1428 STps->drv_file++;
1429 STps->drv_block = 0;
1430 STps->eof = ST_FM;
1431 } else
1432 STps->eof = ST_NOEOF;
1433 }
1434 } else if ((STps->eof == ST_NOEOF &&
1435 !(result = cross_eof(STp, 1))) ||
1436 STps->eof == ST_FM_HIT) {
1437 if (STps->drv_file >= 0)
1438 STps->drv_file++;
1439 STps->drv_block = 0;
1440 STps->eof = ST_FM;
1441 }
1442 }
1443
1444 out:
1445 if (STp->rew_at_close) {
1446 result2 = st_int_ioctl(STp, MTREW, 1);
1447 if (result == 0)
1448 result = result2;
1449 }
1450 return result;
1451}
1452
1453
1454/* Close the device and release it. BKL is not needed: this is the only thread
1455 accessing this tape. */
1456static int st_release(struct inode *inode, struct file *filp)
1457{
1458 int result = 0;
1459 struct scsi_tape *STp = filp->private_data;
1460
1461 if (STp->door_locked == ST_LOCKED_AUTO)
1462 do_door_lock(STp, 0);
1463
1464 normalize_buffer(STp->buffer);
Jeff Mahoney6c648d92012-08-18 15:20:39 -04001465 spin_lock(&st_use_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 STp->in_use = 0;
Jeff Mahoney6c648d92012-08-18 15:20:39 -04001467 spin_unlock(&st_use_lock);
Oliver Neukum46a243f2012-01-15 00:16:51 +01001468 scsi_autopm_put_device(STp->device);
Kai Makisaraf03a5672005-08-02 13:40:47 +03001469 scsi_tape_put(STp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
1471 return result;
1472}
1473
1474/* The checks common to both reading and writing */
1475static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
1476{
1477 ssize_t retval = 0;
1478
1479 /*
1480 * If we are in the middle of error recovery, don't let anyone
1481 * else try and use this device. Also, if error recovery fails, it
1482 * may try and take the device offline, in which case all further
1483 * access to the device is prohibited.
1484 */
1485 if (!scsi_block_when_processing_errors(STp->device)) {
1486 retval = (-ENXIO);
1487 goto out;
1488 }
1489
1490 if (STp->ready != ST_READY) {
1491 if (STp->ready == ST_NO_TAPE)
1492 retval = (-ENOMEDIUM);
1493 else
1494 retval = (-EIO);
1495 goto out;
1496 }
1497
1498 if (! STp->modes[STp->current_mode].defined) {
1499 retval = (-ENXIO);
1500 goto out;
1501 }
1502
1503
1504 /*
1505 * If there was a bus reset, block further access
1506 * to this device.
1507 */
1508 if (STp->pos_unknown) {
1509 retval = (-EIO);
1510 goto out;
1511 }
1512
1513 if (count == 0)
1514 goto out;
1515
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001516 DEB(
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 if (!STp->in_use) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001518 st_printk(ST_DEB_MSG, STp,
1519 "Incorrect device.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 retval = (-EIO);
1521 goto out;
1522 } ) /* end DEB */
1523
1524 if (STp->can_partitions &&
1525 (retval = switch_partition(STp)) < 0)
1526 goto out;
1527
1528 if (STp->block_size == 0 && STp->max_block > 0 &&
1529 (count < STp->min_block || count > STp->max_block)) {
1530 retval = (-EINVAL);
1531 goto out;
1532 }
1533
1534 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
1535 !do_door_lock(STp, 1))
1536 STp->door_locked = ST_LOCKED_AUTO;
1537
1538 out:
1539 return retval;
1540}
1541
1542
1543static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
1544 size_t count, int is_read)
1545{
1546 int i, bufsize, retval = 0;
1547 struct st_buffer *STbp = STp->buffer;
1548
1549 if (is_read)
Kai Makisara9abe16c2007-02-03 13:21:29 +02001550 i = STp->try_dio_now && try_rdio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 else
Kai Makisara9abe16c2007-02-03 13:21:29 +02001552 i = STp->try_dio_now && try_wdio;
Mike Christie8b05b772005-11-08 04:06:44 -06001553
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 if (i && ((unsigned long)buf & queue_dma_alignment(
1555 STp->device->request_queue)) == 0) {
FUJITA Tomonori66207422008-12-18 14:49:43 +09001556 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
1557 count, (is_read ? READ : WRITE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 if (i > 0) {
1559 STbp->do_dio = i;
1560 STbp->buffer_bytes = 0; /* can be used as transfer counter */
1561 }
1562 else
1563 STbp->do_dio = 0; /* fall back to buffering with any error */
1564 STbp->sg_segs = STbp->do_dio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 DEB(
1566 if (STbp->do_dio) {
1567 STp->nbr_dio++;
1568 STp->nbr_pages += STbp->do_dio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 }
1570 )
1571 } else
1572 STbp->do_dio = 0;
1573 DEB( STp->nbr_requests++; )
1574
1575 if (!STbp->do_dio) {
1576 if (STp->block_size)
1577 bufsize = STp->block_size > st_fixed_buffer_size ?
1578 STp->block_size : st_fixed_buffer_size;
Kai Makisara40f6b362008-02-24 22:23:24 +02001579 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 bufsize = count;
Kai Makisara40f6b362008-02-24 22:23:24 +02001581 /* Make sure that data from previous user is not leaked even if
1582 HBA does not return correct residual */
1583 if (is_read && STp->sili && !STbp->cleared)
1584 clear_buffer(STbp);
1585 }
1586
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 if (bufsize > STbp->buffer_size &&
1588 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001589 st_printk(KERN_WARNING, STp,
1590 "Can't allocate %d byte tape buffer.\n",
1591 bufsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 retval = (-EOVERFLOW);
1593 goto out;
1594 }
1595 if (STp->block_size)
1596 STbp->buffer_blocks = bufsize / STp->block_size;
1597 }
1598
1599 out:
1600 return retval;
1601}
1602
1603
1604/* Can be called more than once after each setup_buffer() */
Kai Makisara787926b2005-11-13 10:04:44 +02001605static void release_buffering(struct scsi_tape *STp, int is_read)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606{
1607 struct st_buffer *STbp;
1608
1609 STbp = STp->buffer;
1610 if (STbp->do_dio) {
FUJITA Tomonori66207422008-12-18 14:49:43 +09001611 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 STbp->do_dio = 0;
Kai Makisara787926b2005-11-13 10:04:44 +02001613 STbp->sg_segs = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 }
1615}
1616
1617
1618/* Write command */
1619static ssize_t
1620st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
1621{
1622 ssize_t total;
1623 ssize_t i, do_count, blks, transfer;
1624 ssize_t retval;
1625 int undone, retry_eot = 0, scode;
1626 int async_write;
1627 unsigned char cmd[MAX_COMMAND_SIZE];
1628 const char __user *b_point;
Mike Christie8b05b772005-11-08 04:06:44 -06001629 struct st_request *SRpnt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 struct scsi_tape *STp = filp->private_data;
1631 struct st_modedef *STm;
1632 struct st_partstat *STps;
1633 struct st_buffer *STbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634
Matthias Kaehlcke28f85002007-07-29 23:38:15 +02001635 if (mutex_lock_interruptible(&STp->lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 return -ERESTARTSYS;
1637
1638 retval = rw_checks(STp, filp, count);
1639 if (retval || count == 0)
1640 goto out;
1641
1642 /* Write must be integral number of blocks */
1643 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001644 st_printk(KERN_WARNING, STp,
1645 "Write not multiple of tape block size.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 retval = (-EINVAL);
1647 goto out;
1648 }
1649
1650 STm = &(STp->modes[STp->current_mode]);
1651 STps = &(STp->ps[STp->partition]);
1652
1653 if (STp->write_prot) {
1654 retval = (-EACCES);
1655 goto out;
1656 }
1657
1658
1659 if (STps->rw == ST_READING) {
1660 retval = flush_buffer(STp, 0);
1661 if (retval)
1662 goto out;
1663 STps->rw = ST_WRITING;
1664 } else if (STps->rw != ST_WRITING &&
1665 STps->drv_file == 0 && STps->drv_block == 0) {
1666 if ((retval = set_mode_densblk(STp, STm)) < 0)
1667 goto out;
1668 if (STm->default_compression != ST_DONT_TOUCH &&
1669 !(STp->compression_changed)) {
1670 if (st_compression(STp, (STm->default_compression == ST_YES))) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001671 st_printk(KERN_WARNING, STp,
1672 "Can't set default compression.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 if (modes_defined) {
1674 retval = (-EINVAL);
1675 goto out;
1676 }
1677 }
1678 }
1679 }
1680
1681 STbp = STp->buffer;
1682 i = write_behind_check(STp);
1683 if (i) {
1684 if (i == -ENOSPC)
1685 STps->eof = ST_EOM_OK;
1686 else
1687 STps->eof = ST_EOM_ERROR;
1688 }
1689
1690 if (STps->eof == ST_EOM_OK) {
1691 STps->eof = ST_EOD_1; /* allow next write */
1692 retval = (-ENOSPC);
1693 goto out;
1694 }
1695 else if (STps->eof == ST_EOM_ERROR) {
1696 retval = (-EIO);
1697 goto out;
1698 }
1699
1700 /* Check the buffer readability in cases where copy_user might catch
1701 the problems after some tape movement. */
1702 if (STp->block_size != 0 &&
1703 !STbp->do_dio &&
1704 (copy_from_user(&i, buf, 1) != 0 ||
1705 copy_from_user(&i, buf + count - 1, 1) != 0)) {
1706 retval = (-EFAULT);
1707 goto out;
1708 }
1709
1710 retval = setup_buffering(STp, buf, count, 0);
1711 if (retval)
1712 goto out;
1713
1714 total = count;
1715
1716 memset(cmd, 0, MAX_COMMAND_SIZE);
1717 cmd[0] = WRITE_6;
1718 cmd[1] = (STp->block_size != 0);
1719
1720 STps->rw = ST_WRITING;
1721
1722 b_point = buf;
1723 while (count > 0 && !retry_eot) {
1724
1725 if (STbp->do_dio) {
1726 do_count = count;
1727 }
1728 else {
1729 if (STp->block_size == 0)
1730 do_count = count;
1731 else {
1732 do_count = STbp->buffer_blocks * STp->block_size -
1733 STbp->buffer_bytes;
1734 if (do_count > count)
1735 do_count = count;
1736 }
1737
1738 i = append_to_buffer(b_point, STbp, do_count);
1739 if (i) {
1740 retval = i;
1741 goto out;
1742 }
1743 }
1744 count -= do_count;
1745 b_point += do_count;
1746
1747 async_write = STp->block_size == 0 && !STbp->do_dio &&
1748 STm->do_async_writes && STps->eof < ST_EOM_OK;
1749
1750 if (STp->block_size != 0 && STm->do_buffer_writes &&
Kai Makisara9abe16c2007-02-03 13:21:29 +02001751 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 STbp->buffer_bytes < STbp->buffer_size) {
1753 STp->dirty = 1;
1754 /* Don't write a buffer that is not full enough. */
1755 if (!async_write && count == 0)
1756 break;
1757 }
1758
1759 retry_write:
1760 if (STp->block_size == 0)
1761 blks = transfer = do_count;
1762 else {
1763 if (!STbp->do_dio)
1764 blks = STbp->buffer_bytes;
1765 else
1766 blks = do_count;
1767 blks /= STp->block_size;
1768 transfer = blks * STp->block_size;
1769 }
1770 cmd[2] = blks >> 16;
1771 cmd[3] = blks >> 8;
1772 cmd[4] = blks;
1773
1774 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
James Bottomleya02488e2008-11-30 10:36:26 -06001775 STp->device->request_queue->rq_timeout,
1776 MAX_WRITE_RETRIES, !async_write);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 if (!SRpnt) {
1778 retval = STbp->syscall_result;
1779 goto out;
1780 }
Mike Christie8b05b772005-11-08 04:06:44 -06001781 if (async_write && !STbp->syscall_result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782 STbp->writing = transfer;
1783 STp->dirty = !(STbp->writing ==
1784 STbp->buffer_bytes);
1785 SRpnt = NULL; /* Prevent releasing this request! */
1786 DEB( STp->write_pending = 1; )
1787 break;
1788 }
1789
1790 if (STbp->syscall_result != 0) {
1791 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1792
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001793 DEBC_printk(STp, "Error on write:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
1795 scode = cmdstatp->sense_hdr.sense_key;
1796 if (cmdstatp->remainder_valid)
1797 undone = (int)cmdstatp->uremainder64;
1798 else if (STp->block_size == 0 &&
1799 scode == VOLUME_OVERFLOW)
1800 undone = transfer;
1801 else
1802 undone = 0;
1803 if (STp->block_size != 0)
1804 undone *= STp->block_size;
1805 if (undone <= do_count) {
1806 /* Only data from this write is not written */
1807 count += undone;
Kai Makisara626dcb12008-07-11 15:05:25 +03001808 b_point -= undone;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 do_count -= undone;
1810 if (STp->block_size)
1811 blks = (transfer - undone) / STp->block_size;
1812 STps->eof = ST_EOM_OK;
1813 /* Continue in fixed block mode if all written
1814 in this request but still something left to write
1815 (retval left to zero)
1816 */
1817 if (STp->block_size == 0 ||
1818 undone > 0 || count == 0)
1819 retval = (-ENOSPC); /* EOM within current request */
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001820 DEBC_printk(STp, "EOM with %d "
1821 "bytes unwritten.\n",
1822 (int)count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 } else {
1824 /* EOT within data buffered earlier (possible only
1825 in fixed block mode without direct i/o) */
1826 if (!retry_eot && !cmdstatp->deferred &&
1827 (scode == NO_SENSE || scode == RECOVERED_ERROR)) {
1828 move_buffer_data(STp->buffer, transfer - undone);
1829 retry_eot = 1;
1830 if (STps->drv_block >= 0) {
1831 STps->drv_block += (transfer - undone) /
1832 STp->block_size;
1833 }
1834 STps->eof = ST_EOM_OK;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001835 DEBC_printk(STp, "Retry "
1836 "write of %d "
1837 "bytes at EOM.\n",
1838 STp->buffer->buffer_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 goto retry_write;
1840 }
1841 else {
1842 /* Either error within data buffered by driver or
1843 failed retry */
1844 count -= do_count;
1845 blks = do_count = 0;
1846 STps->eof = ST_EOM_ERROR;
1847 STps->drv_block = (-1); /* Too cautious? */
1848 retval = (-EIO); /* EOM for old data */
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001849 DEBC_printk(STp, "EOM with "
1850 "lost data.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 }
1852 }
1853 } else {
1854 count += do_count;
1855 STps->drv_block = (-1); /* Too cautious? */
Mike Christie8b05b772005-11-08 04:06:44 -06001856 retval = STbp->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 }
1858
1859 }
1860
1861 if (STps->drv_block >= 0) {
1862 if (STp->block_size == 0)
1863 STps->drv_block += (do_count > 0);
1864 else
1865 STps->drv_block += blks;
1866 }
1867
1868 STbp->buffer_bytes = 0;
1869 STp->dirty = 0;
1870
1871 if (retval || retry_eot) {
1872 if (count < total)
1873 retval = total - count;
1874 goto out;
1875 }
1876 }
1877
1878 if (STps->eof == ST_EOD_1)
1879 STps->eof = ST_EOM_OK;
1880 else if (STps->eof != ST_EOM_OK)
1881 STps->eof = ST_NOEOF;
1882 retval = total - count;
1883
1884 out:
1885 if (SRpnt != NULL)
Mike Christie8b05b772005-11-08 04:06:44 -06001886 st_release_request(SRpnt);
Kai Makisara787926b2005-11-13 10:04:44 +02001887 release_buffering(STp, 0);
Matthias Kaehlcke28f85002007-07-29 23:38:15 +02001888 mutex_unlock(&STp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889
1890 return retval;
1891}
1892
1893/* Read data from the tape. Returns zero in the normal case, one if the
1894 eof status has changed, and the negative error code in case of a
1895 fatal error. Otherwise updates the buffer and the eof state.
1896
1897 Does release user buffer mapping if it is set.
1898*/
1899static long read_tape(struct scsi_tape *STp, long count,
Mike Christie8b05b772005-11-08 04:06:44 -06001900 struct st_request ** aSRpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901{
1902 int transfer, blks, bytes;
1903 unsigned char cmd[MAX_COMMAND_SIZE];
Mike Christie8b05b772005-11-08 04:06:44 -06001904 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 struct st_modedef *STm;
1906 struct st_partstat *STps;
1907 struct st_buffer *STbp;
1908 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909
1910 if (count == 0)
1911 return 0;
1912
1913 STm = &(STp->modes[STp->current_mode]);
1914 STps = &(STp->ps[STp->partition]);
1915 if (STps->eof == ST_FM_HIT)
1916 return 1;
1917 STbp = STp->buffer;
1918
1919 if (STp->block_size == 0)
1920 blks = bytes = count;
1921 else {
Kai Makisara9abe16c2007-02-03 13:21:29 +02001922 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 blks = (STp->buffer)->buffer_blocks;
1924 bytes = blks * STp->block_size;
1925 } else {
1926 bytes = count;
1927 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
1928 bytes = (STp->buffer)->buffer_size;
1929 blks = bytes / STp->block_size;
1930 bytes = blks * STp->block_size;
1931 }
1932 }
1933
1934 memset(cmd, 0, MAX_COMMAND_SIZE);
1935 cmd[0] = READ_6;
1936 cmd[1] = (STp->block_size != 0);
Kai Makisara40f6b362008-02-24 22:23:24 +02001937 if (!cmd[1] && STp->sili)
1938 cmd[1] |= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 cmd[2] = blks >> 16;
1940 cmd[3] = blks >> 8;
1941 cmd[4] = blks;
1942
1943 SRpnt = *aSRpnt;
1944 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
James Bottomleya02488e2008-11-30 10:36:26 -06001945 STp->device->request_queue->rq_timeout,
1946 MAX_RETRIES, 1);
Kai Makisara787926b2005-11-13 10:04:44 +02001947 release_buffering(STp, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 *aSRpnt = SRpnt;
1949 if (!SRpnt)
1950 return STbp->syscall_result;
1951
1952 STbp->read_pointer = 0;
1953 STps->at_sm = 0;
1954
1955 /* Something to check */
1956 if (STbp->syscall_result) {
1957 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
1958
1959 retval = 1;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001960 DEBC_printk(STp,
1961 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
1962 SRpnt->sense[0], SRpnt->sense[1],
1963 SRpnt->sense[2], SRpnt->sense[3],
1964 SRpnt->sense[4], SRpnt->sense[5],
1965 SRpnt->sense[6], SRpnt->sense[7]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966 if (cmdstatp->have_sense) {
1967
1968 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
1969 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
1970
1971 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
1972 /* Compute the residual count */
1973 if (cmdstatp->remainder_valid)
1974 transfer = (int)cmdstatp->uremainder64;
1975 else
1976 transfer = 0;
1977 if (STp->block_size == 0 &&
1978 cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR)
1979 transfer = bytes;
1980
1981 if (cmdstatp->flags & SENSE_ILI) { /* ILI */
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02001982 if (STp->block_size == 0 &&
1983 transfer < 0) {
1984 st_printk(KERN_NOTICE, STp,
1985 "Failed to read %d "
1986 "byte block with %d "
1987 "byte transfer.\n",
1988 bytes - transfer,
1989 bytes);
1990 if (STps->drv_block >= 0)
1991 STps->drv_block += 1;
1992 STbp->buffer_bytes = 0;
1993 return (-ENOMEM);
1994 } else if (STp->block_size == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 STbp->buffer_bytes = bytes - transfer;
1996 } else {
Mike Christie8b05b772005-11-08 04:06:44 -06001997 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998 SRpnt = *aSRpnt = NULL;
1999 if (transfer == blks) { /* We did not get anything, error */
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002000 st_printk(KERN_NOTICE, STp,
2001 "Incorrect "
2002 "block size.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 if (STps->drv_block >= 0)
2004 STps->drv_block += blks - transfer + 1;
2005 st_int_ioctl(STp, MTBSR, 1);
2006 return (-EIO);
2007 }
2008 /* We have some data, deliver it */
2009 STbp->buffer_bytes = (blks - transfer) *
2010 STp->block_size;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002011 DEBC_printk(STp, "ILI but "
2012 "enough data "
2013 "received %ld "
2014 "%d.\n", count,
2015 STbp->buffer_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 if (STps->drv_block >= 0)
2017 STps->drv_block += 1;
2018 if (st_int_ioctl(STp, MTBSR, 1))
2019 return (-EIO);
2020 }
2021 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
2022 if (STps->eof != ST_FM_HIT)
2023 STps->eof = ST_FM_HIT;
2024 else
2025 STps->eof = ST_EOD_2;
2026 if (STp->block_size == 0)
2027 STbp->buffer_bytes = 0;
2028 else
2029 STbp->buffer_bytes =
2030 bytes - transfer * STp->block_size;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002031 DEBC_printk(STp, "EOF detected (%d "
2032 "bytes read).\n",
2033 STbp->buffer_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 } else if (cmdstatp->flags & SENSE_EOM) {
2035 if (STps->eof == ST_FM)
2036 STps->eof = ST_EOD_1;
2037 else
2038 STps->eof = ST_EOM_OK;
2039 if (STp->block_size == 0)
2040 STbp->buffer_bytes = bytes - transfer;
2041 else
2042 STbp->buffer_bytes =
2043 bytes - transfer * STp->block_size;
2044
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002045 DEBC_printk(STp, "EOM detected (%d "
2046 "bytes read).\n",
2047 STbp->buffer_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048 }
2049 }
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002050 /* end of EOF, EOM, ILI test */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 else { /* nonzero sense key */
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002052 DEBC_printk(STp, "Tape error while reading.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053 STps->drv_block = (-1);
2054 if (STps->eof == ST_FM &&
2055 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002056 DEBC_printk(STp, "Zero returned for "
2057 "first BLANK CHECK "
2058 "after EOF.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
2060 } else /* Some other extended sense code */
2061 retval = (-EIO);
2062 }
2063
2064 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
2065 STbp->buffer_bytes = 0;
2066 }
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002067 /* End of extended sense test */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 else { /* Non-extended sense */
2069 retval = STbp->syscall_result;
2070 }
2071
2072 }
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002073 /* End of error handling */
Kai Makisara40f6b362008-02-24 22:23:24 +02002074 else { /* Read successful */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 STbp->buffer_bytes = bytes;
Kai Makisara40f6b362008-02-24 22:23:24 +02002076 if (STp->sili) /* In fixed block mode residual is always zero here */
2077 STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
2078 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079
2080 if (STps->drv_block >= 0) {
2081 if (STp->block_size == 0)
2082 STps->drv_block++;
2083 else
2084 STps->drv_block += STbp->buffer_bytes / STp->block_size;
2085 }
2086 return retval;
2087}
2088
2089
2090/* Read command */
2091static ssize_t
2092st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
2093{
2094 ssize_t total;
2095 ssize_t retval = 0;
2096 ssize_t i, transfer;
2097 int special, do_dio = 0;
Mike Christie8b05b772005-11-08 04:06:44 -06002098 struct st_request *SRpnt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099 struct scsi_tape *STp = filp->private_data;
2100 struct st_modedef *STm;
2101 struct st_partstat *STps;
2102 struct st_buffer *STbp = STp->buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103
Matthias Kaehlcke28f85002007-07-29 23:38:15 +02002104 if (mutex_lock_interruptible(&STp->lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 return -ERESTARTSYS;
2106
2107 retval = rw_checks(STp, filp, count);
2108 if (retval || count == 0)
2109 goto out;
2110
2111 STm = &(STp->modes[STp->current_mode]);
Kai Makisara9abe16c2007-02-03 13:21:29 +02002112 if (STp->block_size != 0 && (count % STp->block_size) != 0) {
2113 if (!STm->do_read_ahead) {
2114 retval = (-EINVAL); /* Read must be integral number of blocks */
2115 goto out;
2116 }
2117 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118 }
2119
2120 STps = &(STp->ps[STp->partition]);
2121 if (STps->rw == ST_WRITING) {
2122 retval = flush_buffer(STp, 0);
2123 if (retval)
2124 goto out;
2125 STps->rw = ST_READING;
2126 }
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002127 DEB(
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128 if (debugging && STps->eof != ST_NOEOF)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002129 st_printk(ST_DEB_MSG, STp,
2130 "EOF/EOM flag up (%d). Bytes %d\n",
2131 STps->eof, STbp->buffer_bytes);
2132 ) /* end DEB */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133
2134 retval = setup_buffering(STp, buf, count, 1);
2135 if (retval)
2136 goto out;
2137 do_dio = STbp->do_dio;
2138
2139 if (STbp->buffer_bytes == 0 &&
2140 STps->eof >= ST_EOD_1) {
2141 if (STps->eof < ST_EOD) {
2142 STps->eof += 1;
2143 retval = 0;
2144 goto out;
2145 }
2146 retval = (-EIO); /* EOM or Blank Check */
2147 goto out;
2148 }
2149
2150 if (do_dio) {
2151 /* Check the buffer writability before any tape movement. Don't alter
2152 buffer data. */
2153 if (copy_from_user(&i, buf, 1) != 0 ||
2154 copy_to_user(buf, &i, 1) != 0 ||
2155 copy_from_user(&i, buf + count - 1, 1) != 0 ||
2156 copy_to_user(buf + count - 1, &i, 1) != 0) {
2157 retval = (-EFAULT);
2158 goto out;
2159 }
2160 }
2161
2162 STps->rw = ST_READING;
2163
2164
2165 /* Loop until enough data in buffer or a special condition found */
2166 for (total = 0, special = 0; total < count && !special;) {
2167
2168 /* Get new data if the buffer is empty */
2169 if (STbp->buffer_bytes == 0) {
2170 special = read_tape(STp, count - total, &SRpnt);
2171 if (special < 0) { /* No need to continue read */
2172 retval = special;
2173 goto out;
2174 }
2175 }
2176
2177 /* Move the data from driver buffer to user buffer */
2178 if (STbp->buffer_bytes > 0) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002179 DEB(
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180 if (debugging && STps->eof != ST_NOEOF)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002181 st_printk(ST_DEB_MSG, STp,
2182 "EOF up (%d). Left %d, needed %d.\n",
2183 STps->eof, STbp->buffer_bytes,
2184 (int)(count - total));
2185 ) /* end DEB */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186 transfer = STbp->buffer_bytes < count - total ?
2187 STbp->buffer_bytes : count - total;
2188 if (!do_dio) {
2189 i = from_buffer(STbp, buf, transfer);
2190 if (i) {
2191 retval = i;
2192 goto out;
2193 }
2194 }
2195 buf += transfer;
2196 total += transfer;
2197 }
2198
2199 if (STp->block_size == 0)
2200 break; /* Read only one variable length block */
2201
2202 } /* for (total = 0, special = 0;
2203 total < count && !special; ) */
2204
2205 /* Change the eof state if no data from tape or buffer */
2206 if (total == 0) {
2207 if (STps->eof == ST_FM_HIT) {
2208 STps->eof = ST_FM;
2209 STps->drv_block = 0;
2210 if (STps->drv_file >= 0)
2211 STps->drv_file++;
2212 } else if (STps->eof == ST_EOD_1) {
2213 STps->eof = ST_EOD_2;
2214 STps->drv_block = 0;
2215 if (STps->drv_file >= 0)
2216 STps->drv_file++;
2217 } else if (STps->eof == ST_EOD_2)
2218 STps->eof = ST_EOD;
2219 } else if (STps->eof == ST_FM)
2220 STps->eof = ST_NOEOF;
2221 retval = total;
2222
2223 out:
2224 if (SRpnt != NULL) {
Mike Christie8b05b772005-11-08 04:06:44 -06002225 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226 SRpnt = NULL;
2227 }
2228 if (do_dio) {
Kai Makisara787926b2005-11-13 10:04:44 +02002229 release_buffering(STp, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002230 STbp->buffer_bytes = 0;
2231 }
Matthias Kaehlcke28f85002007-07-29 23:38:15 +02002232 mutex_unlock(&STp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002233
2234 return retval;
2235}
2236
2237
2238
2239DEB(
2240/* Set the driver options */
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002241static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242{
2243 if (debugging) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002244 st_printk(KERN_INFO, STp,
2245 "Mode %d options: buffer writes: %d, "
2246 "async writes: %d, read ahead: %d\n",
2247 STp->current_mode, STm->do_buffer_writes,
2248 STm->do_async_writes, STm->do_read_ahead);
2249 st_printk(KERN_INFO, STp,
2250 " can bsr: %d, two FMs: %d, "
2251 "fast mteom: %d, auto lock: %d,\n",
2252 STp->can_bsr, STp->two_fm, STp->fast_mteom,
2253 STp->do_auto_lock);
2254 st_printk(KERN_INFO, STp,
2255 " defs for wr: %d, no block limits: %d, "
2256 "partitions: %d, s2 log: %d\n",
2257 STm->defaults_for_writes, STp->omit_blklims,
2258 STp->can_partitions, STp->scsi2_logical);
2259 st_printk(KERN_INFO, STp,
2260 " sysv: %d nowait: %d sili: %d "
2261 "nowait_filemark: %d\n",
2262 STm->sysv, STp->immediate, STp->sili,
2263 STp->immediate_filemark);
2264 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265 }
2266}
2267 )
2268
2269
2270static int st_set_options(struct scsi_tape *STp, long options)
2271{
2272 int value;
2273 long code;
2274 struct st_modedef *STm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275 struct cdev *cd0, *cd1;
Maurizio Lombardid6216c42014-02-11 22:22:47 +01002276 struct device *d0, *d1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002277
2278 STm = &(STp->modes[STp->current_mode]);
2279 if (!STm->defined) {
Maurizio Lombardid6216c42014-02-11 22:22:47 +01002280 cd0 = STm->cdevs[0];
2281 cd1 = STm->cdevs[1];
2282 d0 = STm->devs[0];
2283 d1 = STm->devs[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002284 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
Maurizio Lombardid6216c42014-02-11 22:22:47 +01002285 STm->cdevs[0] = cd0;
2286 STm->cdevs[1] = cd1;
2287 STm->devs[0] = d0;
2288 STm->devs[1] = d1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002289 modes_defined = 1;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002290 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
2291 STp->current_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292 }
2293
2294 code = options & MT_ST_OPTIONS;
2295 if (code == MT_ST_BOOLEANS) {
2296 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
2297 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
2298 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
2299 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
2300 STp->two_fm = (options & MT_ST_TWO_FM) != 0;
2301 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
2302 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
2303 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
2304 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
2305 if ((STp->device)->scsi_level >= SCSI_2)
2306 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
2307 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
2308 STp->immediate = (options & MT_ST_NOWAIT) != 0;
Lee Duncanc743e442012-03-01 12:41:01 -08002309 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002310 STm->sysv = (options & MT_ST_SYSV) != 0;
Kai Makisara40f6b362008-02-24 22:23:24 +02002311 STp->sili = (options & MT_ST_SILI) != 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312 DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002313 st_log_options(STp, STm); )
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
2315 value = (code == MT_ST_SETBOOLEANS);
2316 if ((options & MT_ST_BUFFER_WRITES) != 0)
2317 STm->do_buffer_writes = value;
2318 if ((options & MT_ST_ASYNC_WRITES) != 0)
2319 STm->do_async_writes = value;
2320 if ((options & MT_ST_DEF_WRITES) != 0)
2321 STm->defaults_for_writes = value;
2322 if ((options & MT_ST_READ_AHEAD) != 0)
2323 STm->do_read_ahead = value;
2324 if ((options & MT_ST_TWO_FM) != 0)
2325 STp->two_fm = value;
2326 if ((options & MT_ST_FAST_MTEOM) != 0)
2327 STp->fast_mteom = value;
2328 if ((options & MT_ST_AUTO_LOCK) != 0)
2329 STp->do_auto_lock = value;
2330 if ((options & MT_ST_CAN_BSR) != 0)
2331 STp->can_bsr = value;
2332 if ((options & MT_ST_NO_BLKLIMS) != 0)
2333 STp->omit_blklims = value;
2334 if ((STp->device)->scsi_level >= SCSI_2 &&
2335 (options & MT_ST_CAN_PARTITIONS) != 0)
2336 STp->can_partitions = value;
2337 if ((options & MT_ST_SCSI2LOGICAL) != 0)
2338 STp->scsi2_logical = value;
2339 if ((options & MT_ST_NOWAIT) != 0)
2340 STp->immediate = value;
Lee Duncanc743e442012-03-01 12:41:01 -08002341 if ((options & MT_ST_NOWAIT_EOF) != 0)
2342 STp->immediate_filemark = value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343 if ((options & MT_ST_SYSV) != 0)
2344 STm->sysv = value;
Kai Makisara40f6b362008-02-24 22:23:24 +02002345 if ((options & MT_ST_SILI) != 0)
2346 STp->sili = value;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002347 DEB(
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348 if ((options & MT_ST_DEBUGGING) != 0)
2349 debugging = value;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002350 st_log_options(STp, STm); )
Linus Torvalds1da177e2005-04-16 15:20:36 -07002351 } else if (code == MT_ST_WRITE_THRESHOLD) {
2352 /* Retained for compatibility */
2353 } else if (code == MT_ST_DEF_BLKSIZE) {
2354 value = (options & ~MT_ST_OPTIONS);
2355 if (value == ~MT_ST_OPTIONS) {
2356 STm->default_blksize = (-1);
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002357 DEBC_printk(STp, "Default block size disabled.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358 } else {
2359 STm->default_blksize = value;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002360 DEBC_printk(STp,"Default block size set to "
2361 "%d bytes.\n", STm->default_blksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362 if (STp->ready == ST_READY) {
2363 STp->blksize_changed = 0;
2364 set_mode_densblk(STp, STm);
2365 }
2366 }
2367 } else if (code == MT_ST_TIMEOUTS) {
2368 value = (options & ~MT_ST_OPTIONS);
2369 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
2370 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002371 DEBC_printk(STp, "Long timeout set to %d seconds.\n",
2372 (value & ~MT_ST_SET_LONG_TIMEOUT));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373 } else {
James Bottomleya02488e2008-11-30 10:36:26 -06002374 blk_queue_rq_timeout(STp->device->request_queue,
2375 value * HZ);
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002376 DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
2377 value);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378 }
2379 } else if (code == MT_ST_SET_CLN) {
2380 value = (options & ~MT_ST_OPTIONS) & 0xff;
2381 if (value != 0 &&
Roel Kluin832151f2009-11-17 14:53:22 -08002382 (value < EXTENDED_SENSE_START ||
2383 value >= SCSI_SENSE_BUFFERSIZE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384 return (-EINVAL);
2385 STp->cln_mode = value;
2386 STp->cln_sense_mask = (options >> 8) & 0xff;
2387 STp->cln_sense_value = (options >> 16) & 0xff;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002388 st_printk(KERN_INFO, STp,
2389 "Cleaning request mode %d, mask %02x, value %02x\n",
2390 value, STp->cln_sense_mask, STp->cln_sense_value);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391 } else if (code == MT_ST_DEF_OPTIONS) {
2392 code = (options & ~MT_ST_CLEAR_DEFAULT);
2393 value = (options & MT_ST_CLEAR_DEFAULT);
2394 if (code == MT_ST_DEF_DENSITY) {
2395 if (value == MT_ST_CLEAR_DEFAULT) {
2396 STm->default_density = (-1);
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002397 DEBC_printk(STp,
2398 "Density default disabled.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002399 } else {
2400 STm->default_density = value & 0xff;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002401 DEBC_printk(STp, "Density default set to %x\n",
2402 STm->default_density);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403 if (STp->ready == ST_READY) {
2404 STp->density_changed = 0;
2405 set_mode_densblk(STp, STm);
2406 }
2407 }
2408 } else if (code == MT_ST_DEF_DRVBUFFER) {
2409 if (value == MT_ST_CLEAR_DEFAULT) {
2410 STp->default_drvbuffer = 0xff;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002411 DEBC_printk(STp,
2412 "Drive buffer default disabled.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413 } else {
2414 STp->default_drvbuffer = value & 7;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002415 DEBC_printk(STp,
2416 "Drive buffer default set to %x\n",
2417 STp->default_drvbuffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002418 if (STp->ready == ST_READY)
2419 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
2420 }
2421 } else if (code == MT_ST_DEF_COMPRESSION) {
2422 if (value == MT_ST_CLEAR_DEFAULT) {
2423 STm->default_compression = ST_DONT_TOUCH;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002424 DEBC_printk(STp,
2425 "Compression default disabled.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002426 } else {
2427 if ((value & 0xff00) != 0) {
2428 STp->c_algo = (value & 0xff00) >> 8;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002429 DEBC_printk(STp, "Compression "
2430 "algorithm set to 0x%x.\n",
2431 STp->c_algo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002432 }
2433 if ((value & 0xff) != 0xff) {
2434 STm->default_compression = (value & 1 ? ST_YES : ST_NO);
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002435 DEBC_printk(STp, "Compression default "
2436 "set to %x\n",
2437 (value & 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438 if (STp->ready == ST_READY) {
2439 STp->compression_changed = 0;
2440 st_compression(STp, (STm->default_compression == ST_YES));
2441 }
2442 }
2443 }
2444 }
2445 } else
2446 return (-EIO);
2447
2448 return 0;
2449}
2450
2451#define MODE_HEADER_LENGTH 4
2452
2453/* Mode header and page byte offsets */
2454#define MH_OFF_DATA_LENGTH 0
2455#define MH_OFF_MEDIUM_TYPE 1
2456#define MH_OFF_DEV_SPECIFIC 2
2457#define MH_OFF_BDESCS_LENGTH 3
2458#define MP_OFF_PAGE_NBR 0
2459#define MP_OFF_PAGE_LENGTH 1
2460
2461/* Mode header and page bit masks */
2462#define MH_BIT_WP 0x80
2463#define MP_MSK_PAGE_NBR 0x3f
2464
2465/* Don't return block descriptors */
2466#define MODE_SENSE_OMIT_BDESCS 0x08
2467
2468#define MODE_SELECT_PAGE_FORMAT 0x10
2469
2470/* Read a mode page into the tape buffer. The block descriptors are included
2471 if incl_block_descs is true. The page control is ored to the page number
2472 parameter, if necessary. */
2473static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
2474{
2475 unsigned char cmd[MAX_COMMAND_SIZE];
FUJITA Tomonori8ecf0d92008-12-05 15:25:28 +09002476 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477
2478 memset(cmd, 0, MAX_COMMAND_SIZE);
2479 cmd[0] = MODE_SENSE;
2480 if (omit_block_descs)
2481 cmd[1] = MODE_SENSE_OMIT_BDESCS;
2482 cmd[2] = page;
2483 cmd[4] = 255;
2484
Kai Makisara02ae2c02008-12-18 14:49:50 +09002485 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
2486 STp->device->request_queue->rq_timeout, 0, 1);
2487 if (SRpnt == NULL)
2488 return (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489
Mike Christie8b05b772005-11-08 04:06:44 -06002490 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491
Kai Makisara02ae2c02008-12-18 14:49:50 +09002492 return STp->buffer->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493}
2494
2495
2496/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
2497 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
2498static int write_mode_page(struct scsi_tape *STp, int page, int slow)
2499{
Kai Makisara02ae2c02008-12-18 14:49:50 +09002500 int pgo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501 unsigned char cmd[MAX_COMMAND_SIZE];
FUJITA Tomonori18c87012008-12-05 15:25:29 +09002502 struct st_request *SRpnt;
Kai Makisara02ae2c02008-12-18 14:49:50 +09002503 int timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002504
2505 memset(cmd, 0, MAX_COMMAND_SIZE);
2506 cmd[0] = MODE_SELECT;
2507 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2508 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
2509 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
2510
2511 /* Clear reserved fields */
2512 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
2513 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
2514 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
2515 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
2516
Kai Makisara02ae2c02008-12-18 14:49:50 +09002517 timeout = slow ?
2518 STp->long_timeout : STp->device->request_queue->rq_timeout;
2519 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
2520 timeout, 0, 1);
2521 if (SRpnt == NULL)
2522 return (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002523
Mike Christie8b05b772005-11-08 04:06:44 -06002524 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002525
Kai Makisara02ae2c02008-12-18 14:49:50 +09002526 return STp->buffer->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002527}
2528
2529
2530#define COMPRESSION_PAGE 0x0f
2531#define COMPRESSION_PAGE_LENGTH 16
2532
2533#define CP_OFF_DCE_DCC 2
2534#define CP_OFF_C_ALGO 7
2535
2536#define DCE_MASK 0x80
2537#define DCC_MASK 0x40
2538#define RED_MASK 0x60
2539
2540
2541/* Control the compression with mode page 15. Algorithm not changed if zero.
2542
2543 The block descriptors are read and written because Sony SDT-7000 does not
2544 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
2545 Including block descriptors should not cause any harm to other drives. */
2546
2547static int st_compression(struct scsi_tape * STp, int state)
2548{
2549 int retval;
2550 int mpoffs; /* Offset to mode page start */
2551 unsigned char *b_data = (STp->buffer)->b_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002552
2553 if (STp->ready != ST_READY)
2554 return (-EIO);
2555
2556 /* Read the current page contents */
2557 retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
2558 if (retval) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002559 DEBC_printk(STp, "Compression mode page not supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560 return (-EIO);
2561 }
2562
2563 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002564 DEBC_printk(STp, "Compression state is %d.\n",
2565 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002566
2567 /* Check if compression can be changed */
2568 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002569 DEBC_printk(STp, "Compression not supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570 return (-EIO);
2571 }
2572
2573 /* Do the change */
2574 if (state) {
2575 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
2576 if (STp->c_algo != 0)
2577 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
2578 }
2579 else {
2580 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
2581 if (STp->c_algo != 0)
2582 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
2583 }
2584
2585 retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
2586 if (retval) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002587 DEBC_printk(STp, "Compression change failed.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002588 return (-EIO);
2589 }
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002590 DEBC_printk(STp, "Compression state changed to %d.\n", state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591
2592 STp->compression_changed = 1;
2593 return 0;
2594}
2595
2596
2597/* Process the load and unload commands (does unload if the load code is zero) */
2598static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
2599{
2600 int retval = (-EIO), timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002601 unsigned char cmd[MAX_COMMAND_SIZE];
2602 struct st_partstat *STps;
Mike Christie8b05b772005-11-08 04:06:44 -06002603 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002604
2605 if (STp->ready != ST_READY && !load_code) {
2606 if (STp->ready == ST_NO_TAPE)
2607 return (-ENOMEDIUM);
2608 else
2609 return (-EIO);
2610 }
2611
2612 memset(cmd, 0, MAX_COMMAND_SIZE);
2613 cmd[0] = START_STOP;
2614 if (load_code)
2615 cmd[4] |= 1;
2616 /*
2617 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
2618 */
2619 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
2620 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002621 DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
2622 (cmd[4]) ? "" : "un",
2623 load_code - MT_ST_HPLOADER_OFFSET);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002624 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
2625 }
2626 if (STp->immediate) {
2627 cmd[1] = 1; /* Don't wait for completion */
James Bottomleya02488e2008-11-30 10:36:26 -06002628 timeout = STp->device->request_queue->rq_timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002629 }
2630 else
2631 timeout = STp->long_timeout;
2632
2633 DEBC(
2634 if (!load_code)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002635 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636 else
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002637 st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638 );
2639
Kai Makisara02ae2c02008-12-18 14:49:50 +09002640 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
2641 timeout, MAX_RETRIES, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642 if (!SRpnt)
Kai Makisara02ae2c02008-12-18 14:49:50 +09002643 return (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644
2645 retval = (STp->buffer)->syscall_result;
Kai Makisara02ae2c02008-12-18 14:49:50 +09002646 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647
2648 if (!retval) { /* SCSI command successful */
2649
2650 if (!load_code) {
2651 STp->rew_at_close = 0;
2652 STp->ready = ST_NO_TAPE;
2653 }
2654 else {
2655 STp->rew_at_close = STp->autorew_dev;
2656 retval = check_tape(STp, filp);
2657 if (retval > 0)
2658 retval = 0;
2659 }
2660 }
2661 else {
2662 STps = &(STp->ps[STp->partition]);
2663 STps->drv_file = STps->drv_block = (-1);
2664 }
2665
2666 return retval;
2667}
2668
2669#if DEBUG
2670#define ST_DEB_FORWARD 0
2671#define ST_DEB_BACKWARD 1
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002672static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673{
2674 s32 sc;
2675
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002676 if (!debugging)
2677 return;
2678
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679 sc = cmd[2] & 0x80 ? 0xff000000 : 0;
2680 sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
2681 if (direction)
2682 sc = -sc;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002683 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
2684 direction ? "backward" : "forward", sc, units);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002685}
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002686#else
2687#define ST_DEB_FORWARD 0
2688#define ST_DEB_BACKWARD 1
2689static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002690#endif
2691
2692
2693/* Internal ioctl function */
2694static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
2695{
2696 int timeout;
2697 long ltmp;
2698 int ioctl_result;
2699 int chg_eof = 1;
2700 unsigned char cmd[MAX_COMMAND_SIZE];
Mike Christie8b05b772005-11-08 04:06:44 -06002701 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002702 struct st_partstat *STps;
2703 int fileno, blkno, at_sm, undone;
2704 int datalen = 0, direction = DMA_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002705
2706 WARN_ON(STp->buffer->do_dio != 0);
2707 if (STp->ready != ST_READY) {
2708 if (STp->ready == ST_NO_TAPE)
2709 return (-ENOMEDIUM);
2710 else
2711 return (-EIO);
2712 }
2713 timeout = STp->long_timeout;
2714 STps = &(STp->ps[STp->partition]);
2715 fileno = STps->drv_file;
2716 blkno = STps->drv_block;
2717 at_sm = STps->at_sm;
2718
2719 memset(cmd, 0, MAX_COMMAND_SIZE);
2720 switch (cmd_in) {
2721 case MTFSFM:
2722 chg_eof = 0; /* Changed from the FSF after this */
2723 case MTFSF:
2724 cmd[0] = SPACE;
2725 cmd[1] = 0x01; /* Space FileMarks */
2726 cmd[2] = (arg >> 16);
2727 cmd[3] = (arg >> 8);
2728 cmd[4] = arg;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002729 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730 if (fileno >= 0)
2731 fileno += arg;
2732 blkno = 0;
2733 at_sm &= (arg == 0);
2734 break;
2735 case MTBSFM:
2736 chg_eof = 0; /* Changed from the FSF after this */
2737 case MTBSF:
2738 cmd[0] = SPACE;
2739 cmd[1] = 0x01; /* Space FileMarks */
2740 ltmp = (-arg);
2741 cmd[2] = (ltmp >> 16);
2742 cmd[3] = (ltmp >> 8);
2743 cmd[4] = ltmp;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002744 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002745 if (fileno >= 0)
2746 fileno -= arg;
2747 blkno = (-1); /* We can't know the block number */
2748 at_sm &= (arg == 0);
2749 break;
2750 case MTFSR:
2751 cmd[0] = SPACE;
2752 cmd[1] = 0x00; /* Space Blocks */
2753 cmd[2] = (arg >> 16);
2754 cmd[3] = (arg >> 8);
2755 cmd[4] = arg;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002756 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002757 if (blkno >= 0)
2758 blkno += arg;
2759 at_sm &= (arg == 0);
2760 break;
2761 case MTBSR:
2762 cmd[0] = SPACE;
2763 cmd[1] = 0x00; /* Space Blocks */
2764 ltmp = (-arg);
2765 cmd[2] = (ltmp >> 16);
2766 cmd[3] = (ltmp >> 8);
2767 cmd[4] = ltmp;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002768 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002769 if (blkno >= 0)
2770 blkno -= arg;
2771 at_sm &= (arg == 0);
2772 break;
2773 case MTFSS:
2774 cmd[0] = SPACE;
2775 cmd[1] = 0x04; /* Space Setmarks */
2776 cmd[2] = (arg >> 16);
2777 cmd[3] = (arg >> 8);
2778 cmd[4] = arg;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002779 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780 if (arg != 0) {
2781 blkno = fileno = (-1);
2782 at_sm = 1;
2783 }
2784 break;
2785 case MTBSS:
2786 cmd[0] = SPACE;
2787 cmd[1] = 0x04; /* Space Setmarks */
2788 ltmp = (-arg);
2789 cmd[2] = (ltmp >> 16);
2790 cmd[3] = (ltmp >> 8);
2791 cmd[4] = ltmp;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002792 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793 if (arg != 0) {
2794 blkno = fileno = (-1);
2795 at_sm = 1;
2796 }
2797 break;
2798 case MTWEOF:
Kai Makisara3e51d3c2010-10-09 00:17:56 +03002799 case MTWEOFI:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002800 case MTWSM:
2801 if (STp->write_prot)
2802 return (-EACCES);
2803 cmd[0] = WRITE_FILEMARKS;
2804 if (cmd_in == MTWSM)
2805 cmd[1] = 2;
Lee Duncanc743e442012-03-01 12:41:01 -08002806 if (cmd_in == MTWEOFI ||
2807 (cmd_in == MTWEOF && STp->immediate_filemark))
Kai Makisara3e51d3c2010-10-09 00:17:56 +03002808 cmd[1] |= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809 cmd[2] = (arg >> 16);
2810 cmd[3] = (arg >> 8);
2811 cmd[4] = arg;
James Bottomleya02488e2008-11-30 10:36:26 -06002812 timeout = STp->device->request_queue->rq_timeout;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002813 DEBC(
2814 if (cmd_in != MTWSM)
2815 st_printk(ST_DEB_MSG, STp,
2816 "Writing %d filemarks.\n",
2817 cmd[2] * 65536 +
2818 cmd[3] * 256 +
2819 cmd[4]);
2820 else
2821 st_printk(ST_DEB_MSG, STp,
2822 "Writing %d setmarks.\n",
2823 cmd[2] * 65536 +
2824 cmd[3] * 256 +
2825 cmd[4]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826 )
2827 if (fileno >= 0)
2828 fileno += arg;
2829 blkno = 0;
2830 at_sm = (cmd_in == MTWSM);
2831 break;
2832 case MTREW:
2833 cmd[0] = REZERO_UNIT;
2834 if (STp->immediate) {
2835 cmd[1] = 1; /* Don't wait for completion */
James Bottomleya02488e2008-11-30 10:36:26 -06002836 timeout = STp->device->request_queue->rq_timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002837 }
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002838 DEBC_printk(STp, "Rewinding tape.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002839 fileno = blkno = at_sm = 0;
2840 break;
2841 case MTNOP:
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002842 DEBC_printk(STp, "No op on tape.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002843 return 0; /* Should do something ? */
2844 break;
2845 case MTRETEN:
2846 cmd[0] = START_STOP;
2847 if (STp->immediate) {
2848 cmd[1] = 1; /* Don't wait for completion */
James Bottomleya02488e2008-11-30 10:36:26 -06002849 timeout = STp->device->request_queue->rq_timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002850 }
2851 cmd[4] = 3;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002852 DEBC_printk(STp, "Retensioning tape.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002853 fileno = blkno = at_sm = 0;
2854 break;
2855 case MTEOM:
2856 if (!STp->fast_mteom) {
2857 /* space to the end of tape */
2858 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
2859 fileno = STps->drv_file;
2860 if (STps->eof >= ST_EOD_1)
2861 return 0;
2862 /* The next lines would hide the number of spaced FileMarks
2863 That's why I inserted the previous lines. I had no luck
2864 with detecting EOM with FSF, so we go now to EOM.
2865 Joerg Weule */
2866 } else
2867 fileno = (-1);
2868 cmd[0] = SPACE;
2869 cmd[1] = 3;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002870 DEBC_printk(STp, "Spacing to end of recorded medium.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002871 blkno = -1;
2872 at_sm = 0;
2873 break;
2874 case MTERASE:
2875 if (STp->write_prot)
2876 return (-EACCES);
2877 cmd[0] = ERASE;
2878 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
2879 if (STp->immediate) {
2880 cmd[1] |= 2; /* Don't wait for completion */
James Bottomleya02488e2008-11-30 10:36:26 -06002881 timeout = STp->device->request_queue->rq_timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882 }
2883 else
2884 timeout = STp->long_timeout * 8;
2885
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002886 DEBC_printk(STp, "Erasing tape.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002887 fileno = blkno = at_sm = 0;
2888 break;
2889 case MTSETBLK: /* Set block length */
2890 case MTSETDENSITY: /* Set tape density */
2891 case MTSETDRVBUFFER: /* Set drive buffering */
2892 case SET_DENS_AND_BLK: /* Set density and block size */
2893 chg_eof = 0;
2894 if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
2895 return (-EIO); /* Not allowed if data in buffer */
2896 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
2897 (arg & MT_ST_BLKSIZE_MASK) != 0 &&
2898 STp->max_block > 0 &&
2899 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
2900 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002901 st_printk(KERN_WARNING, STp, "Illegal block size.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002902 return (-EINVAL);
2903 }
2904 cmd[0] = MODE_SELECT;
2905 if ((STp->use_pf & USE_PF))
2906 cmd[1] = MODE_SELECT_PAGE_FORMAT;
2907 cmd[4] = datalen = 12;
2908 direction = DMA_TO_DEVICE;
2909
2910 memset((STp->buffer)->b_data, 0, 12);
2911 if (cmd_in == MTSETDRVBUFFER)
2912 (STp->buffer)->b_data[2] = (arg & 7) << 4;
2913 else
2914 (STp->buffer)->b_data[2] =
2915 STp->drv_buffer << 4;
2916 (STp->buffer)->b_data[3] = 8; /* block descriptor length */
2917 if (cmd_in == MTSETDENSITY) {
2918 (STp->buffer)->b_data[4] = arg;
2919 STp->density_changed = 1; /* At least we tried ;-) */
2920 } else if (cmd_in == SET_DENS_AND_BLK)
2921 (STp->buffer)->b_data[4] = arg >> 24;
2922 else
2923 (STp->buffer)->b_data[4] = STp->density;
2924 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
2925 ltmp = arg & MT_ST_BLKSIZE_MASK;
2926 if (cmd_in == MTSETBLK)
2927 STp->blksize_changed = 1; /* At least we tried ;-) */
2928 } else
2929 ltmp = STp->block_size;
2930 (STp->buffer)->b_data[9] = (ltmp >> 16);
2931 (STp->buffer)->b_data[10] = (ltmp >> 8);
2932 (STp->buffer)->b_data[11] = ltmp;
James Bottomleya02488e2008-11-30 10:36:26 -06002933 timeout = STp->device->request_queue->rq_timeout;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002934 DEBC(
Linus Torvalds1da177e2005-04-16 15:20:36 -07002935 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002936 st_printk(ST_DEB_MSG, STp,
2937 "Setting block size to %d bytes.\n",
2938 (STp->buffer)->b_data[9] * 65536 +
2939 (STp->buffer)->b_data[10] * 256 +
2940 (STp->buffer)->b_data[11]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002941 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002942 st_printk(ST_DEB_MSG, STp,
2943 "Setting density code to %x.\n",
2944 (STp->buffer)->b_data[4]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002945 if (cmd_in == MTSETDRVBUFFER)
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02002946 st_printk(ST_DEB_MSG, STp,
2947 "Setting drive buffer code to %d.\n",
2948 ((STp->buffer)->b_data[2] >> 4) & 7);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002949 )
2950 break;
2951 default:
2952 return (-ENOSYS);
2953 }
2954
Kai Makisara02ae2c02008-12-18 14:49:50 +09002955 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
2956 timeout, MAX_RETRIES, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002957 if (!SRpnt)
2958 return (STp->buffer)->syscall_result;
2959
Kai Makisara02ae2c02008-12-18 14:49:50 +09002960 ioctl_result = (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002961
2962 if (!ioctl_result) { /* SCSI command successful */
Mike Christie8b05b772005-11-08 04:06:44 -06002963 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002964 SRpnt = NULL;
2965 STps->drv_block = blkno;
2966 STps->drv_file = fileno;
2967 STps->at_sm = at_sm;
2968
2969 if (cmd_in == MTBSFM)
2970 ioctl_result = st_int_ioctl(STp, MTFSF, 1);
2971 else if (cmd_in == MTFSFM)
2972 ioctl_result = st_int_ioctl(STp, MTBSF, 1);
2973
2974 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002975 STp->block_size = arg & MT_ST_BLKSIZE_MASK;
2976 if (STp->block_size != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002977 (STp->buffer)->buffer_blocks =
2978 (STp->buffer)->buffer_size / STp->block_size;
2979 }
2980 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
2981 if (cmd_in == SET_DENS_AND_BLK)
2982 STp->density = arg >> MT_ST_DENSITY_SHIFT;
2983 } else if (cmd_in == MTSETDRVBUFFER)
2984 STp->drv_buffer = (arg & 7);
2985 else if (cmd_in == MTSETDENSITY)
2986 STp->density = arg;
2987
2988 if (cmd_in == MTEOM)
2989 STps->eof = ST_EOD;
2990 else if (cmd_in == MTFSF)
2991 STps->eof = ST_FM;
2992 else if (chg_eof)
2993 STps->eof = ST_NOEOF;
2994
Kai Makisara3e51d3c2010-10-09 00:17:56 +03002995 if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
2996 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002997 } else { /* SCSI command was not completely successful. Don't return
2998 from this block without releasing the SCSI command block! */
2999 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
3000
3001 if (cmdstatp->flags & SENSE_EOM) {
3002 if (cmd_in != MTBSF && cmd_in != MTBSFM &&
3003 cmd_in != MTBSR && cmd_in != MTBSS)
3004 STps->eof = ST_EOM_OK;
3005 STps->drv_block = 0;
3006 }
3007
3008 if (cmdstatp->remainder_valid)
3009 undone = (int)cmdstatp->uremainder64;
3010 else
3011 undone = 0;
3012
Kai Makisara3e51d3c2010-10-09 00:17:56 +03003013 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07003014 cmdstatp->have_sense &&
Kai Makisara91614c02007-01-26 00:38:39 +02003015 (cmdstatp->flags & SENSE_EOM)) {
3016 if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
3017 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
3018 ioctl_result = 0; /* EOF(s) written successfully at EOM */
3019 STps->eof = ST_NOEOF;
3020 } else { /* Writing EOF(s) failed */
3021 if (fileno >= 0)
3022 fileno -= undone;
3023 if (undone < arg)
3024 STps->eof = ST_NOEOF;
3025 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026 STps->drv_file = fileno;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
3028 if (fileno >= 0)
3029 STps->drv_file = fileno - undone;
3030 else
3031 STps->drv_file = fileno;
3032 STps->drv_block = -1;
3033 STps->eof = ST_NOEOF;
3034 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
3035 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3036 undone = (-undone);
3037 if (STps->drv_file >= 0)
3038 STps->drv_file = fileno + undone;
3039 STps->drv_block = 0;
3040 STps->eof = ST_NOEOF;
3041 } else if (cmd_in == MTFSR) {
3042 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3043 if (STps->drv_file >= 0)
3044 STps->drv_file++;
3045 STps->drv_block = 0;
3046 STps->eof = ST_FM;
3047 } else {
3048 if (blkno >= undone)
3049 STps->drv_block = blkno - undone;
3050 else
3051 STps->drv_block = (-1);
3052 STps->eof = ST_NOEOF;
3053 }
3054 } else if (cmd_in == MTBSR) {
3055 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
3056 STps->drv_file--;
3057 STps->drv_block = (-1);
3058 } else {
3059 if (arg > 0 && undone < 0) /* Some drives get this wrong */
3060 undone = (-undone);
3061 if (STps->drv_block >= 0)
3062 STps->drv_block = blkno + undone;
3063 }
3064 STps->eof = ST_NOEOF;
3065 } else if (cmd_in == MTEOM) {
3066 STps->drv_file = (-1);
3067 STps->drv_block = (-1);
3068 STps->eof = ST_EOD;
3069 } else if (cmd_in == MTSETBLK ||
3070 cmd_in == MTSETDENSITY ||
3071 cmd_in == MTSETDRVBUFFER ||
3072 cmd_in == SET_DENS_AND_BLK) {
3073 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
3074 !(STp->use_pf & PF_TESTED)) {
3075 /* Try the other possible state of Page Format if not
3076 already tried */
Kai Makisara1da20192009-05-02 08:49:34 +03003077 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
Mike Christie8b05b772005-11-08 04:06:44 -06003078 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003079 SRpnt = NULL;
3080 return st_int_ioctl(STp, cmd_in, arg);
3081 }
3082 } else if (chg_eof)
3083 STps->eof = ST_NOEOF;
3084
3085 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
3086 STps->eof = ST_EOD;
3087
Mike Christie8b05b772005-11-08 04:06:44 -06003088 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003089 SRpnt = NULL;
3090 }
3091
3092 return ioctl_result;
3093}
3094
3095
3096/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
3097 structure. */
3098
3099static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
3100 int logical)
3101{
3102 int result;
3103 unsigned char scmd[MAX_COMMAND_SIZE];
Mike Christie8b05b772005-11-08 04:06:44 -06003104 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105
3106 if (STp->ready != ST_READY)
3107 return (-EIO);
3108
3109 memset(scmd, 0, MAX_COMMAND_SIZE);
3110 if ((STp->device)->scsi_level < SCSI_2) {
3111 scmd[0] = QFA_REQUEST_BLOCK;
3112 scmd[4] = 3;
3113 } else {
3114 scmd[0] = READ_POSITION;
3115 if (!logical && !STp->scsi2_logical)
3116 scmd[1] = 1;
3117 }
Kai Makisara02ae2c02008-12-18 14:49:50 +09003118 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
3119 STp->device->request_queue->rq_timeout,
3120 MAX_READY_RETRIES, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003121 if (!SRpnt)
Kai Makisara02ae2c02008-12-18 14:49:50 +09003122 return (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123
3124 if ((STp->buffer)->syscall_result != 0 ||
3125 (STp->device->scsi_level >= SCSI_2 &&
3126 ((STp->buffer)->b_data[0] & 4) != 0)) {
3127 *block = *partition = 0;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003128 DEBC_printk(STp, " Can't read tape position.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003129 result = (-EIO);
3130 } else {
3131 result = 0;
3132 if ((STp->device)->scsi_level < SCSI_2) {
3133 *block = ((STp->buffer)->b_data[0] << 16)
3134 + ((STp->buffer)->b_data[1] << 8)
3135 + (STp->buffer)->b_data[2];
3136 *partition = 0;
3137 } else {
3138 *block = ((STp->buffer)->b_data[4] << 24)
3139 + ((STp->buffer)->b_data[5] << 16)
3140 + ((STp->buffer)->b_data[6] << 8)
3141 + (STp->buffer)->b_data[7];
3142 *partition = (STp->buffer)->b_data[1];
3143 if (((STp->buffer)->b_data[0] & 0x80) &&
3144 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
3145 STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
3146 }
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003147 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
3148 *block, *partition);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003149 }
Mike Christie8b05b772005-11-08 04:06:44 -06003150 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003151 SRpnt = NULL;
3152
3153 return result;
3154}
3155
3156
3157/* Set the tape block and partition. Negative partition means that only the
3158 block should be set in vendor specific way. */
3159static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
3160 int logical)
3161{
3162 struct st_partstat *STps;
3163 int result, p;
3164 unsigned int blk;
3165 int timeout;
3166 unsigned char scmd[MAX_COMMAND_SIZE];
Mike Christie8b05b772005-11-08 04:06:44 -06003167 struct st_request *SRpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003168
3169 if (STp->ready != ST_READY)
3170 return (-EIO);
3171 timeout = STp->long_timeout;
3172 STps = &(STp->ps[STp->partition]);
3173
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003174 DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
3175 block, partition);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003176 DEB(if (partition < 0)
3177 return (-EIO); )
3178
3179 /* Update the location at the partition we are leaving */
3180 if ((!STp->can_partitions && partition != 0) ||
3181 partition >= ST_NBR_PARTITIONS)
3182 return (-EINVAL);
3183 if (partition != STp->partition) {
3184 if (get_location(STp, &blk, &p, 1))
3185 STps->last_block_valid = 0;
3186 else {
3187 STps->last_block_valid = 1;
3188 STps->last_block_visited = blk;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003189 DEBC_printk(STp, "Visited block %d for "
3190 "partition %d saved.\n",
3191 blk, STp->partition);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003192 }
3193 }
3194
3195 memset(scmd, 0, MAX_COMMAND_SIZE);
3196 if ((STp->device)->scsi_level < SCSI_2) {
3197 scmd[0] = QFA_SEEK_BLOCK;
3198 scmd[2] = (block >> 16);
3199 scmd[3] = (block >> 8);
3200 scmd[4] = block;
3201 scmd[5] = 0;
3202 } else {
3203 scmd[0] = SEEK_10;
3204 scmd[3] = (block >> 24);
3205 scmd[4] = (block >> 16);
3206 scmd[5] = (block >> 8);
3207 scmd[6] = block;
3208 if (!logical && !STp->scsi2_logical)
3209 scmd[1] = 4;
3210 if (STp->partition != partition) {
3211 scmd[1] |= 2;
3212 scmd[8] = partition;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003213 DEBC_printk(STp, "Trying to change partition "
3214 "from %d to %d\n", STp->partition,
3215 partition);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003216 }
3217 }
3218 if (STp->immediate) {
3219 scmd[1] |= 1; /* Don't wait for completion */
James Bottomleya02488e2008-11-30 10:36:26 -06003220 timeout = STp->device->request_queue->rq_timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003221 }
3222
Kai Makisara02ae2c02008-12-18 14:49:50 +09003223 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
3224 timeout, MAX_READY_RETRIES, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003225 if (!SRpnt)
Kai Makisara02ae2c02008-12-18 14:49:50 +09003226 return (STp->buffer)->syscall_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003227
3228 STps->drv_block = STps->drv_file = (-1);
3229 STps->eof = ST_NOEOF;
3230 if ((STp->buffer)->syscall_result != 0) {
3231 result = (-EIO);
3232 if (STp->can_partitions &&
3233 (STp->device)->scsi_level >= SCSI_2 &&
3234 (p = find_partition(STp)) >= 0)
3235 STp->partition = p;
3236 } else {
3237 if (STp->can_partitions) {
3238 STp->partition = partition;
3239 STps = &(STp->ps[partition]);
3240 if (!STps->last_block_valid ||
3241 STps->last_block_visited != block) {
3242 STps->at_sm = 0;
3243 STps->rw = ST_IDLE;
3244 }
3245 } else
3246 STps->at_sm = 0;
3247 if (block == 0)
3248 STps->drv_block = STps->drv_file = 0;
3249 result = 0;
3250 }
Kai Makisara02ae2c02008-12-18 14:49:50 +09003251
Mike Christie8b05b772005-11-08 04:06:44 -06003252 st_release_request(SRpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003253 SRpnt = NULL;
3254
3255 return result;
3256}
3257
3258
3259/* Find the current partition number for the drive status. Called from open and
3260 returns either partition number of negative error code. */
3261static int find_partition(struct scsi_tape *STp)
3262{
3263 int i, partition;
3264 unsigned int block;
3265
3266 if ((i = get_location(STp, &block, &partition, 1)) < 0)
3267 return i;
3268 if (partition >= ST_NBR_PARTITIONS)
3269 return (-EIO);
3270 return partition;
3271}
3272
3273
3274/* Change the partition if necessary */
3275static int switch_partition(struct scsi_tape *STp)
3276{
3277 struct st_partstat *STps;
3278
3279 if (STp->partition == STp->new_partition)
3280 return 0;
3281 STps = &(STp->ps[STp->new_partition]);
3282 if (!STps->last_block_valid)
3283 STps->last_block_visited = 0;
3284 return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
3285}
3286
3287/* Functions for reading and writing the medium partition mode page. */
3288
3289#define PART_PAGE 0x11
3290#define PART_PAGE_FIXED_LENGTH 8
3291
3292#define PP_OFF_MAX_ADD_PARTS 2
3293#define PP_OFF_NBR_ADD_PARTS 3
3294#define PP_OFF_FLAGS 4
3295#define PP_OFF_PART_UNITS 6
3296#define PP_OFF_RESERVED 7
3297
3298#define PP_BIT_IDP 0x20
3299#define PP_MSK_PSUM_MB 0x10
3300
3301/* Get the number of partitions on the tape. As a side effect reads the
3302 mode page into the tape buffer. */
3303static int nbr_partitions(struct scsi_tape *STp)
3304{
3305 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003306
3307 if (STp->ready != ST_READY)
3308 return (-EIO);
3309
3310 result = read_mode_page(STp, PART_PAGE, 1);
3311
3312 if (result) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003313 DEBC_printk(STp, "Can't read medium partition page.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003314 result = (-EIO);
3315 } else {
3316 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
3317 PP_OFF_NBR_ADD_PARTS] + 1;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003318 DEBC_printk(STp, "Number of partitions %d.\n", result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003319 }
3320
3321 return result;
3322}
3323
3324
3325/* Partition the tape into two partitions if size > 0 or one partition if
3326 size == 0.
3327
3328 The block descriptors are read and written because Sony SDT-7000 does not
3329 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
3330
3331 My HP C1533A drive returns only one partition size field. This is used to
3332 set the size of partition 1. There is no size field for the default partition.
3333 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
3334 used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
3335 The following algorithm is used to accommodate both drives: if the number of
3336 partition size fields is greater than the maximum number of additional partitions
3337 in the mode page, the second field is used. Otherwise the first field is used.
3338
3339 For Seagate DDS drives the page length must be 8 when no partitions is defined
3340 and 10 when 1 partition is defined (information from Eric Lee Green). This is
3341 is acceptable also to some other old drives and enforced if the first partition
3342 size field is used for the first additional partition size.
3343 */
3344static int partition_tape(struct scsi_tape *STp, int size)
3345{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003346 int result;
3347 int pgo, psd_cnt, psdo;
3348 unsigned char *bp;
3349
3350 result = read_mode_page(STp, PART_PAGE, 0);
3351 if (result) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003352 DEBC_printk(STp, "Can't read partition mode page.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003353 return result;
3354 }
3355 /* The mode page is in the buffer. Let's modify it and write it. */
3356 bp = (STp->buffer)->b_data;
3357 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003358 DEBC_printk(STp, "Partition page length is %d bytes.\n",
3359 bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003360
3361 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
3362 psdo = pgo + PART_PAGE_FIXED_LENGTH;
3363 if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) {
3364 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */
3365 psdo += 2;
3366 }
3367 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
3368
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003369 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003370 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003371 bp[pgo + PP_OFF_NBR_ADD_PARTS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003372
3373 if (size <= 0) {
3374 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
3375 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
3376 bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003377 DEBC_printk(STp, "Formatting tape with one partition.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003378 } else {
3379 bp[psdo] = (size >> 8) & 0xff;
3380 bp[psdo + 1] = size & 0xff;
3381 bp[pgo + 3] = 1;
3382 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
3383 bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003384 DEBC_printk(STp, "Formatting tape with two partitions "
3385 "(1 = %d MB).\n", size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003386 }
3387 bp[pgo + PP_OFF_PART_UNITS] = 0;
3388 bp[pgo + PP_OFF_RESERVED] = 0;
3389 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB;
3390
3391 result = write_mode_page(STp, PART_PAGE, 1);
3392 if (result) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003393 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003394 result = (-EIO);
3395 }
3396
3397 return result;
3398}
3399
3400
3401
3402/* The ioctl command */
Kai Makisarafd66c1b2008-01-17 22:45:22 +02003403static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003404{
3405 int i, cmd_nr, cmd_type, bt;
3406 int retval = 0;
3407 unsigned int blk;
3408 struct scsi_tape *STp = file->private_data;
3409 struct st_modedef *STm;
3410 struct st_partstat *STps;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003411 void __user *p = (void __user *)arg;
3412
Matthias Kaehlcke28f85002007-07-29 23:38:15 +02003413 if (mutex_lock_interruptible(&STp->lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003414 return -ERESTARTSYS;
3415
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003416 DEB(
Linus Torvalds1da177e2005-04-16 15:20:36 -07003417 if (debugging && !STp->in_use) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003418 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003419 retval = (-EIO);
3420 goto out;
3421 } ) /* end DEB */
3422
3423 STm = &(STp->modes[STp->current_mode]);
3424 STps = &(STp->ps[STp->partition]);
3425
3426 /*
3427 * If we are in the middle of error recovery, don't let anyone
3428 * else try and use this device. Also, if error recovery fails, it
3429 * may try and take the device offline, in which case all further
3430 * access to the device is prohibited.
3431 */
Christoph Hellwig906d15f2014-10-11 16:25:31 +02003432 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
3433 file->f_flags & O_NDELAY);
3434 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003435 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003436
3437 cmd_type = _IOC_TYPE(cmd_in);
3438 cmd_nr = _IOC_NR(cmd_in);
3439
3440 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
3441 struct mtop mtc;
3442
3443 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
3444 retval = (-EINVAL);
3445 goto out;
3446 }
3447
3448 i = copy_from_user(&mtc, p, sizeof(struct mtop));
3449 if (i) {
3450 retval = (-EFAULT);
3451 goto out;
3452 }
3453
3454 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02003455 st_printk(KERN_WARNING, STp,
3456 "MTSETDRVBUFFER only allowed for root.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003457 retval = (-EPERM);
3458 goto out;
3459 }
3460 if (!STm->defined &&
3461 (mtc.mt_op != MTSETDRVBUFFER &&
3462 (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
3463 retval = (-ENXIO);
3464 goto out;
3465 }
3466
3467 if (!STp->pos_unknown) {
3468
3469 if (STps->eof == ST_FM_HIT) {
3470 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3471 mtc.mt_op == MTEOM) {
3472 mtc.mt_count -= 1;
3473 if (STps->drv_file >= 0)
3474 STps->drv_file += 1;
3475 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
3476 mtc.mt_count += 1;
3477 if (STps->drv_file >= 0)
3478 STps->drv_file += 1;
3479 }
3480 }
3481
3482 if (mtc.mt_op == MTSEEK) {
3483 /* Old position must be restored if partition will be
3484 changed */
3485 i = !STp->can_partitions ||
3486 (STp->new_partition != STp->partition);
3487 } else {
3488 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3489 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
3490 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
3491 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
3492 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
3493 mtc.mt_op == MTCOMPRESSION;
3494 }
3495 i = flush_buffer(STp, i);
3496 if (i < 0) {
3497 retval = i;
3498 goto out;
3499 }
3500 if (STps->rw == ST_WRITING &&
3501 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
3502 mtc.mt_op == MTSEEK ||
3503 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
3504 i = st_int_ioctl(STp, MTWEOF, 1);
3505 if (i < 0) {
3506 retval = i;
3507 goto out;
3508 }
3509 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
3510 mtc.mt_count++;
3511 STps->rw = ST_IDLE;
3512 }
3513
3514 } else {
3515 /*
3516 * If there was a bus reset, block further access
3517 * to this device. If the user wants to rewind the tape,
3518 * then reset the flag and allow access again.
3519 */
3520 if (mtc.mt_op != MTREW &&
3521 mtc.mt_op != MTOFFL &&
3522 mtc.mt_op != MTRETEN &&
3523 mtc.mt_op != MTERASE &&
3524 mtc.mt_op != MTSEEK &&
3525 mtc.mt_op != MTEOM) {
3526 retval = (-EIO);
3527 goto out;
3528 }
3529 reset_state(STp);
3530 /* remove this when the midlevel properly clears was_reset */
3531 STp->device->was_reset = 0;
3532 }
3533
3534 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
3535 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
3536 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
3537 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
3538
3539 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
3540 do_door_lock(STp, 0); /* Ignore result! */
3541
3542 if (mtc.mt_op == MTSETDRVBUFFER &&
3543 (mtc.mt_count & MT_ST_OPTIONS) != 0) {
3544 retval = st_set_options(STp, mtc.mt_count);
3545 goto out;
3546 }
3547
3548 if (mtc.mt_op == MTSETPART) {
3549 if (!STp->can_partitions ||
3550 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
3551 retval = (-EINVAL);
3552 goto out;
3553 }
3554 if (mtc.mt_count >= STp->nbr_partitions &&
3555 (STp->nbr_partitions = nbr_partitions(STp)) < 0) {
3556 retval = (-EIO);
3557 goto out;
3558 }
3559 if (mtc.mt_count >= STp->nbr_partitions) {
3560 retval = (-EINVAL);
3561 goto out;
3562 }
3563 STp->new_partition = mtc.mt_count;
3564 retval = 0;
3565 goto out;
3566 }
3567
3568 if (mtc.mt_op == MTMKPART) {
3569 if (!STp->can_partitions) {
3570 retval = (-EINVAL);
3571 goto out;
3572 }
3573 if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 ||
3574 (i = partition_tape(STp, mtc.mt_count)) < 0) {
3575 retval = i;
3576 goto out;
3577 }
3578 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
3579 STp->ps[i].rw = ST_IDLE;
3580 STp->ps[i].at_sm = 0;
3581 STp->ps[i].last_block_valid = 0;
3582 }
3583 STp->partition = STp->new_partition = 0;
3584 STp->nbr_partitions = 1; /* Bad guess ?-) */
3585 STps->drv_block = STps->drv_file = 0;
3586 retval = 0;
3587 goto out;
3588 }
3589
3590 if (mtc.mt_op == MTSEEK) {
3591 i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
3592 if (!STp->can_partitions)
3593 STp->ps[0].rw = ST_IDLE;
3594 retval = i;
3595 goto out;
3596 }
3597
3598 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
3599 retval = do_load_unload(STp, file, 0);
3600 goto out;
3601 }
3602
3603 if (mtc.mt_op == MTLOAD) {
3604 retval = do_load_unload(STp, file, max(1, mtc.mt_count));
3605 goto out;
3606 }
3607
3608 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
3609 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
3610 goto out;
3611 }
3612
3613 if (STp->can_partitions && STp->ready == ST_READY &&
3614 (i = switch_partition(STp)) < 0) {
3615 retval = i;
3616 goto out;
3617 }
3618
3619 if (mtc.mt_op == MTCOMPRESSION)
3620 retval = st_compression(STp, (mtc.mt_count & 1));
3621 else
3622 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
3623 goto out;
3624 }
3625 if (!STm->defined) {
3626 retval = (-ENXIO);
3627 goto out;
3628 }
3629
3630 if ((i = flush_buffer(STp, 0)) < 0) {
3631 retval = i;
3632 goto out;
3633 }
3634 if (STp->can_partitions &&
3635 (i = switch_partition(STp)) < 0) {
3636 retval = i;
3637 goto out;
3638 }
3639
3640 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
3641 struct mtget mt_status;
3642
3643 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
3644 retval = (-EINVAL);
3645 goto out;
3646 }
3647
3648 mt_status.mt_type = STp->tape_type;
3649 mt_status.mt_dsreg =
3650 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
3651 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
3652 mt_status.mt_blkno = STps->drv_block;
3653 mt_status.mt_fileno = STps->drv_file;
3654 if (STp->block_size != 0) {
3655 if (STps->rw == ST_WRITING)
3656 mt_status.mt_blkno +=
3657 (STp->buffer)->buffer_bytes / STp->block_size;
3658 else if (STps->rw == ST_READING)
3659 mt_status.mt_blkno -=
3660 ((STp->buffer)->buffer_bytes +
3661 STp->block_size - 1) / STp->block_size;
3662 }
3663
3664 mt_status.mt_gstat = 0;
3665 if (STp->drv_write_prot)
3666 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
3667 if (mt_status.mt_blkno == 0) {
3668 if (mt_status.mt_fileno == 0)
3669 mt_status.mt_gstat |= GMT_BOT(0xffffffff);
3670 else
3671 mt_status.mt_gstat |= GMT_EOF(0xffffffff);
3672 }
3673 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
3674 mt_status.mt_resid = STp->partition;
3675 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
3676 mt_status.mt_gstat |= GMT_EOT(0xffffffff);
3677 else if (STps->eof >= ST_EOM_OK)
3678 mt_status.mt_gstat |= GMT_EOD(0xffffffff);
3679 if (STp->density == 1)
3680 mt_status.mt_gstat |= GMT_D_800(0xffffffff);
3681 else if (STp->density == 2)
3682 mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
3683 else if (STp->density == 3)
3684 mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
3685 if (STp->ready == ST_READY)
3686 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
3687 if (STp->ready == ST_NO_TAPE)
3688 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
3689 if (STps->at_sm)
3690 mt_status.mt_gstat |= GMT_SM(0xffffffff);
3691 if (STm->do_async_writes ||
3692 (STm->do_buffer_writes && STp->block_size != 0) ||
3693 STp->drv_buffer != 0)
3694 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
3695 if (STp->cleaning_req)
3696 mt_status.mt_gstat |= GMT_CLN(0xffffffff);
3697
3698 i = copy_to_user(p, &mt_status, sizeof(struct mtget));
3699 if (i) {
3700 retval = (-EFAULT);
3701 goto out;
3702 }
3703
3704 STp->recover_reg = 0; /* Clear after read */
3705 retval = 0;
3706 goto out;
3707 } /* End of MTIOCGET */
3708 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
3709 struct mtpos mt_pos;
3710 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
3711 retval = (-EINVAL);
3712 goto out;
3713 }
3714 if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
3715 retval = i;
3716 goto out;
3717 }
3718 mt_pos.mt_blkno = blk;
3719 i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
3720 if (i)
3721 retval = (-EFAULT);
3722 goto out;
3723 }
Matthias Kaehlcke28f85002007-07-29 23:38:15 +02003724 mutex_unlock(&STp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003725 switch (cmd_in) {
3726 case SCSI_IOCTL_GET_IDLUN:
3727 case SCSI_IOCTL_GET_BUS_NUMBER:
3728 break;
3729 default:
Kai Makisara 16c4b3e2005-05-01 18:11:55 +03003730 if ((cmd_in == SG_IO ||
3731 cmd_in == SCSI_IOCTL_SEND_COMMAND ||
3732 cmd_in == CDROM_SEND_PACKET) &&
3733 !capable(CAP_SYS_RAWIO))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003734 i = -EPERM;
3735 else
Al Viro74f3c8a2007-08-27 15:38:10 -04003736 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
3737 file->f_mode, cmd_in, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003738 if (i != -ENOTTY)
3739 return i;
3740 break;
3741 }
Kai Makisara 16c4b3e2005-05-01 18:11:55 +03003742 retval = scsi_ioctl(STp->device, cmd_in, p);
3743 if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
3744 STp->rew_at_close = 0;
3745 STp->ready = ST_NO_TAPE;
3746 }
3747 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003748
3749 out:
Matthias Kaehlcke28f85002007-07-29 23:38:15 +02003750 mutex_unlock(&STp->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003751 return retval;
3752}
3753
3754#ifdef CONFIG_COMPAT
3755static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
3756{
3757 struct scsi_tape *STp = file->private_data;
3758 struct scsi_device *sdev = STp->device;
3759 int ret = -ENOIOCTLCMD;
3760 if (sdev->host->hostt->compat_ioctl) {
3761
3762 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
3763
3764 }
3765 return ret;
3766}
3767#endif
3768
3769
3770
3771/* Try to allocate a new tape buffer. Calling function must not hold
3772 dev_arr_lock. */
FUJITA Tomonorif409d6c2008-12-18 14:49:47 +09003773static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003774{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003775 struct st_buffer *tb;
3776
FUJITA Tomonorif409d6c2008-12-18 14:49:47 +09003777 tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003778 if (!tb) {
3779 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
3780 return NULL;
3781 }
FUJITA Tomonori1ac63cf2008-12-18 14:49:48 +09003782 tb->frp_segs = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003783 tb->use_sg = max_sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003784 tb->dma = need_dma;
FUJITA Tomonorif409d6c2008-12-18 14:49:47 +09003785 tb->buffer_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003786
FUJITA Tomonorif409d6c2008-12-18 14:49:47 +09003787 tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
3788 GFP_ATOMIC);
FUJITA Tomonorid0e1ae32008-12-18 14:49:40 +09003789 if (!tb->reserved_pages) {
3790 kfree(tb);
3791 return NULL;
3792 }
3793
Linus Torvalds1da177e2005-04-16 15:20:36 -07003794 return tb;
3795}
3796
3797
3798/* Try to allocate enough space in the tape buffer */
Kai Makisara8f78fc52008-12-18 14:49:51 +09003799#define ST_MAX_ORDER 6
3800
Linus Torvalds1da177e2005-04-16 15:20:36 -07003801static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
3802{
Bodo Stroesser769989a2013-12-02 18:52:10 +01003803 int segs, max_segs, b_size, order, got;
Al Viroc53033f2005-10-21 03:22:08 -04003804 gfp_t priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003805
3806 if (new_size <= STbuffer->buffer_size)
3807 return 1;
3808
3809 if (STbuffer->buffer_size <= PAGE_SIZE)
3810 normalize_buffer(STbuffer); /* Avoid extra segment */
3811
3812 max_segs = STbuffer->use_sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003813
3814 priority = GFP_KERNEL | __GFP_NOWARN;
3815 if (need_dma)
3816 priority |= GFP_DMA;
FUJITA Tomonori9c905962008-12-18 14:49:39 +09003817
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003818 if (STbuffer->cleared)
3819 priority |= __GFP_ZERO;
3820
FUJITA Tomonori9c905962008-12-18 14:49:39 +09003821 if (STbuffer->frp_segs) {
FUJITA Tomonoric982c362009-11-26 09:24:13 +09003822 order = STbuffer->reserved_page_order;
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003823 b_size = PAGE_SIZE << order;
FUJITA Tomonori9c905962008-12-18 14:49:39 +09003824 } else {
3825 for (b_size = PAGE_SIZE, order = 0;
FUJITA Tomonori46081b12010-12-20 18:44:45 +02003826 order < ST_MAX_ORDER &&
3827 max_segs * (PAGE_SIZE << order) < new_size;
Kai Makisara8f78fc52008-12-18 14:49:51 +09003828 order++, b_size *= 2)
FUJITA Tomonori9c905962008-12-18 14:49:39 +09003829 ; /* empty */
Kai Makisara373daac2010-12-20 18:43:39 +02003830 STbuffer->reserved_page_order = order;
FUJITA Tomonori9c905962008-12-18 14:49:39 +09003831 }
Kai Makisara8f78fc52008-12-18 14:49:51 +09003832 if (max_segs * (PAGE_SIZE << order) < new_size) {
3833 if (order == ST_MAX_ORDER)
3834 return 0;
3835 normalize_buffer(STbuffer);
3836 return enlarge_buffer(STbuffer, new_size, need_dma);
3837 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003838
3839 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
3840 segs < max_segs && got < new_size;) {
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003841 struct page *page;
3842
3843 page = alloc_pages(priority, order);
3844 if (!page) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003845 DEB(STbuffer->buffer_size = got);
3846 normalize_buffer(STbuffer);
3847 return 0;
3848 }
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003849
Linus Torvalds1da177e2005-04-16 15:20:36 -07003850 STbuffer->frp_segs += 1;
3851 got += b_size;
3852 STbuffer->buffer_size = got;
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003853 STbuffer->reserved_pages[segs] = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003854 segs++;
3855 }
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003856 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003857
3858 return 1;
3859}
3860
3861
Kai Makisara40f6b362008-02-24 22:23:24 +02003862/* Make sure that no data from previous user is in the internal buffer */
3863static void clear_buffer(struct st_buffer * st_bp)
3864{
3865 int i;
3866
3867 for (i=0; i < st_bp->frp_segs; i++)
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003868 memset(page_address(st_bp->reserved_pages[i]), 0,
FUJITA Tomonoric982c362009-11-26 09:24:13 +09003869 PAGE_SIZE << st_bp->reserved_page_order);
Kai Makisara40f6b362008-02-24 22:23:24 +02003870 st_bp->cleared = 1;
3871}
3872
3873
Linus Torvalds1da177e2005-04-16 15:20:36 -07003874/* Release the extra buffer */
3875static void normalize_buffer(struct st_buffer * STbuffer)
3876{
FUJITA Tomonoric982c362009-11-26 09:24:13 +09003877 int i, order = STbuffer->reserved_page_order;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003878
FUJITA Tomonori1ac63cf2008-12-18 14:49:48 +09003879 for (i = 0; i < STbuffer->frp_segs; i++) {
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003880 __free_pages(STbuffer->reserved_pages[i], order);
3881 STbuffer->buffer_size -= (PAGE_SIZE << order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003882 }
FUJITA Tomonori1ac63cf2008-12-18 14:49:48 +09003883 STbuffer->frp_segs = 0;
Mike Christie8b05b772005-11-08 04:06:44 -06003884 STbuffer->sg_segs = 0;
FUJITA Tomonoric982c362009-11-26 09:24:13 +09003885 STbuffer->reserved_page_order = 0;
FUJITA Tomonorid0e1ae32008-12-18 14:49:40 +09003886 STbuffer->map_data.offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003887}
3888
3889
3890/* Move data from the user buffer to the tape buffer. Returns zero (success) or
3891 negative error code. */
3892static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
3893{
3894 int i, cnt, res, offset;
FUJITA Tomonoric982c362009-11-26 09:24:13 +09003895 int length = PAGE_SIZE << st_bp->reserved_page_order;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003896
3897 for (i = 0, offset = st_bp->buffer_bytes;
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003898 i < st_bp->frp_segs && offset >= length; i++)
3899 offset -= length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003900 if (i == st_bp->frp_segs) { /* Should never happen */
3901 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
3902 return (-EIO);
3903 }
3904 for (; i < st_bp->frp_segs && do_count > 0; i++) {
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003905 struct page *page = st_bp->reserved_pages[i];
3906 cnt = length - offset < do_count ? length - offset : do_count;
3907 res = copy_from_user(page_address(page) + offset, ubp, cnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003908 if (res)
3909 return (-EFAULT);
3910 do_count -= cnt;
3911 st_bp->buffer_bytes += cnt;
3912 ubp += cnt;
3913 offset = 0;
3914 }
3915 if (do_count) /* Should never happen */
3916 return (-EIO);
3917
3918 return 0;
3919}
3920
3921
3922/* Move data from the tape buffer to the user buffer. Returns zero (success) or
3923 negative error code. */
3924static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
3925{
3926 int i, cnt, res, offset;
FUJITA Tomonoric982c362009-11-26 09:24:13 +09003927 int length = PAGE_SIZE << st_bp->reserved_page_order;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003928
3929 for (i = 0, offset = st_bp->read_pointer;
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003930 i < st_bp->frp_segs && offset >= length; i++)
3931 offset -= length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003932 if (i == st_bp->frp_segs) { /* Should never happen */
3933 printk(KERN_WARNING "st: from_buffer offset overflow.\n");
3934 return (-EIO);
3935 }
3936 for (; i < st_bp->frp_segs && do_count > 0; i++) {
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003937 struct page *page = st_bp->reserved_pages[i];
3938 cnt = length - offset < do_count ? length - offset : do_count;
3939 res = copy_to_user(ubp, page_address(page) + offset, cnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003940 if (res)
3941 return (-EFAULT);
3942 do_count -= cnt;
3943 st_bp->buffer_bytes -= cnt;
3944 st_bp->read_pointer += cnt;
3945 ubp += cnt;
3946 offset = 0;
3947 }
3948 if (do_count) /* Should never happen */
3949 return (-EIO);
3950
3951 return 0;
3952}
3953
3954
3955/* Move data towards start of buffer */
3956static void move_buffer_data(struct st_buffer * st_bp, int offset)
3957{
3958 int src_seg, dst_seg, src_offset = 0, dst_offset;
3959 int count, total;
FUJITA Tomonoric982c362009-11-26 09:24:13 +09003960 int length = PAGE_SIZE << st_bp->reserved_page_order;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003961
3962 if (offset == 0)
3963 return;
3964
3965 total=st_bp->buffer_bytes - offset;
3966 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
3967 src_offset = offset;
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003968 if (src_offset < length)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003969 break;
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003970 offset -= length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003971 }
3972
3973 st_bp->buffer_bytes = st_bp->read_pointer = total;
3974 for (dst_seg=dst_offset=0; total > 0; ) {
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003975 struct page *dpage = st_bp->reserved_pages[dst_seg];
3976 struct page *spage = st_bp->reserved_pages[src_seg];
3977
3978 count = min(length - dst_offset, length - src_offset);
3979 memmove(page_address(dpage) + dst_offset,
3980 page_address(spage) + src_offset, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003981 src_offset += count;
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003982 if (src_offset >= length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003983 src_seg++;
3984 src_offset = 0;
3985 }
3986 dst_offset += count;
FUJITA Tomonori08c95832008-12-18 14:49:45 +09003987 if (dst_offset >= length) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003988 dst_seg++;
3989 dst_offset = 0;
3990 }
3991 total -= count;
3992 }
3993}
3994
Linus Torvalds1da177e2005-04-16 15:20:36 -07003995/* Validate the options from command line or module parameters */
3996static void validate_options(void)
3997{
3998 if (buffer_kbs > 0)
3999 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
4000 if (max_sg_segs >= ST_FIRST_SG)
4001 st_max_sg_segs = max_sg_segs;
4002}
4003
4004#ifndef MODULE
4005/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
4006 */
4007static int __init st_setup(char *str)
4008{
4009 int i, len, ints[5];
4010 char *stp;
4011
4012 stp = get_options(str, ARRAY_SIZE(ints), ints);
4013
4014 if (ints[0] > 0) {
4015 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
4016 if (parms[i].val)
4017 *parms[i].val = ints[i + 1];
4018 } else {
4019 while (stp != NULL) {
4020 for (i = 0; i < ARRAY_SIZE(parms); i++) {
4021 len = strlen(parms[i].name);
4022 if (!strncmp(stp, parms[i].name, len) &&
4023 (*(stp + len) == ':' || *(stp + len) == '=')) {
4024 if (parms[i].val)
4025 *parms[i].val =
4026 simple_strtoul(stp + len + 1, NULL, 0);
4027 else
4028 printk(KERN_WARNING "st: Obsolete parameter %s\n",
4029 parms[i].name);
4030 break;
4031 }
4032 }
Tobias Klauser6391a112006-06-08 22:23:48 -07004033 if (i >= ARRAY_SIZE(parms))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004034 printk(KERN_WARNING "st: invalid parameter in '%s'\n",
4035 stp);
4036 stp = strchr(stp, ',');
4037 if (stp)
4038 stp++;
4039 }
4040 }
4041
4042 validate_options();
4043
4044 return 1;
4045}
4046
4047__setup("st=", st_setup);
4048
4049#endif
4050
Arjan van de Ven00977a52007-02-12 00:55:34 -08004051static const struct file_operations st_fops =
Linus Torvalds1da177e2005-04-16 15:20:36 -07004052{
4053 .owner = THIS_MODULE,
4054 .read = st_read,
4055 .write = st_write,
Kai Makisarafd66c1b2008-01-17 22:45:22 +02004056 .unlocked_ioctl = st_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004057#ifdef CONFIG_COMPAT
4058 .compat_ioctl = st_compat_ioctl,
4059#endif
4060 .open = st_open,
4061 .flush = st_flush,
4062 .release = st_release,
Jan Blunckb4d878e2010-05-26 14:44:51 -07004063 .llseek = noop_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004064};
4065
Jeff Mahoney26898af2012-08-18 15:20:40 -04004066static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
4067{
4068 int i, error;
4069 dev_t cdev_devno;
4070 struct cdev *cdev;
4071 struct device *dev;
4072 struct st_modedef *STm = &(tape->modes[mode]);
4073 char name[10];
4074 int dev_num = tape->index;
4075
4076 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
4077
4078 cdev = cdev_alloc();
4079 if (!cdev) {
4080 pr_err("st%d: out of memory. Device not attached.\n", dev_num);
4081 error = -ENOMEM;
4082 goto out;
4083 }
4084 cdev->owner = THIS_MODULE;
4085 cdev->ops = &st_fops;
4086
4087 error = cdev_add(cdev, cdev_devno, 1);
4088 if (error) {
4089 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
4090 rew ? "non" : "auto", mode);
4091 pr_err("st%d: Device not attached.\n", dev_num);
4092 goto out_free;
4093 }
4094 STm->cdevs[rew] = cdev;
4095
4096 i = mode << (4 - ST_NBR_MODE_BITS);
4097 snprintf(name, 10, "%s%s%s", rew ? "n" : "",
4098 tape->disk->disk_name, st_formats[i]);
4099
4100 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
4101 cdev_devno, &tape->modes[mode], "%s", name);
4102 if (IS_ERR(dev)) {
4103 pr_err("st%d: device_create failed\n", dev_num);
4104 error = PTR_ERR(dev);
4105 goto out_free;
4106 }
4107
4108 STm->devs[rew] = dev;
4109
4110 return 0;
4111out_free:
4112 cdev_del(STm->cdevs[rew]);
4113 STm->cdevs[rew] = NULL;
4114out:
4115 return error;
4116}
4117
4118static int create_cdevs(struct scsi_tape *tape)
4119{
4120 int mode, error;
4121 for (mode = 0; mode < ST_NBR_MODES; ++mode) {
4122 error = create_one_cdev(tape, mode, 0);
4123 if (error)
4124 return error;
4125 error = create_one_cdev(tape, mode, 1);
4126 if (error)
4127 return error;
4128 }
4129
4130 return sysfs_create_link(&tape->device->sdev_gendev.kobj,
4131 &tape->modes[0].devs[0]->kobj, "tape");
4132}
4133
4134static void remove_cdevs(struct scsi_tape *tape)
4135{
4136 int mode, rew;
4137 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
4138 for (mode = 0; mode < ST_NBR_MODES; mode++) {
4139 struct st_modedef *STm = &(tape->modes[mode]);
4140 for (rew = 0; rew < 2; rew++) {
4141 if (STm->cdevs[rew])
4142 cdev_del(STm->cdevs[rew]);
4143 if (STm->devs[rew])
4144 device_unregister(STm->devs[rew]);
4145 }
4146 }
4147}
4148
Linus Torvalds1da177e2005-04-16 15:20:36 -07004149static int st_probe(struct device *dev)
4150{
4151 struct scsi_device *SDp = to_scsi_device(dev);
4152 struct gendisk *disk = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004153 struct scsi_tape *tpnt = NULL;
4154 struct st_modedef *STm;
4155 struct st_partstat *STps;
4156 struct st_buffer *buffer;
Tejun Heob98c52b2013-02-27 17:04:42 -08004157 int i, error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004158 char *stp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004159
4160 if (SDp->type != TYPE_TAPE)
4161 return -ENODEV;
4162 if ((stp = st_incompatible(SDp))) {
Jeff Garzik3bf743e2005-10-24 18:04:06 -04004163 sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02004164 sdev_printk(KERN_INFO, SDp,
4165 "st: The suggested driver is %s.\n", stp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004166 return -ENODEV;
4167 }
4168
Subhash Jadavani6fe8c1d2014-09-10 14:54:09 +03004169 scsi_autopm_get_device(SDp);
Martin K. Petersen8a783622010-02-26 00:20:39 -05004170 i = queue_max_segments(SDp->request_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004171 if (st_max_sg_segs < i)
4172 i = st_max_sg_segs;
FUJITA Tomonorif409d6c2008-12-18 14:49:47 +09004173 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004174 if (buffer == NULL) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02004175 sdev_printk(KERN_ERR, SDp,
4176 "st: Can't allocate new tape buffer. "
4177 "Device not attached.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004178 goto out;
4179 }
4180
4181 disk = alloc_disk(1);
4182 if (!disk) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02004183 sdev_printk(KERN_ERR, SDp,
4184 "st: out of memory. Device not attached.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004185 goto out_buffer_free;
4186 }
4187
Jes Sorensen24669f752006-01-16 10:31:18 -05004188 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004189 if (tpnt == NULL) {
Hannes Reineckeb30d8bc2014-06-25 16:39:57 +02004190 sdev_printk(KERN_ERR, SDp,
4191 "st: Can't allocate device descriptor.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004192 goto out_put_disk;
4193 }
Kai Makisaraf03a5672005-08-02 13:40:47 +03004194 kref_init(&tpnt->kref);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004195 tpnt->disk = disk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004196 disk->private_data = &tpnt->driver;
4197 disk->queue = SDp->request_queue;
Joe Lawrence2b5bebc2013-03-05 10:57:56 -05004198 /* SCSI tape doesn't register this gendisk via add_disk(). Manually
4199 * take queue reference that release_disk() expects. */
4200 if (!blk_get_queue(disk->queue))
4201 goto out_put_disk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004202 tpnt->driver = &st_template;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004203
4204 tpnt->device = SDp;
4205 if (SDp->scsi_level <= 2)
4206 tpnt->tape_type = MT_ISSCSI1;
4207 else
4208 tpnt->tape_type = MT_ISSCSI2;
4209
4210 tpnt->buffer = buffer;
Kai Makisaraf03a5672005-08-02 13:40:47 +03004211 tpnt->buffer->last_SRpnt = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004212
4213 tpnt->inited = 0;
4214 tpnt->dirty = 0;
4215 tpnt->in_use = 0;
4216 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
4217 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
4218 tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
4219 tpnt->density = 0;
4220 tpnt->do_auto_lock = ST_AUTO_LOCK;
4221 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
4222 tpnt->can_partitions = 0;
4223 tpnt->two_fm = ST_TWO_FM;
4224 tpnt->fast_mteom = ST_FAST_MTEOM;
4225 tpnt->scsi2_logical = ST_SCSI2LOGICAL;
Kai Makisara40f6b362008-02-24 22:23:24 +02004226 tpnt->sili = ST_SILI;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004227 tpnt->immediate = ST_NOWAIT;
Lee Duncanc743e442012-03-01 12:41:01 -08004228 tpnt->immediate_filemark = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004229 tpnt->default_drvbuffer = 0xff; /* No forced buffering */
4230 tpnt->partition = 0;
4231 tpnt->new_partition = 0;
4232 tpnt->nbr_partitions = 0;
James Bottomleya02488e2008-11-30 10:36:26 -06004233 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004234 tpnt->long_timeout = ST_LONG_TIMEOUT;
4235 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
4236
Linus Torvalds1da177e2005-04-16 15:20:36 -07004237 for (i = 0; i < ST_NBR_MODES; i++) {
4238 STm = &(tpnt->modes[i]);
4239 STm->defined = 0;
4240 STm->sysv = ST_SYSV;
4241 STm->defaults_for_writes = 0;
4242 STm->do_async_writes = ST_ASYNC_WRITES;
4243 STm->do_buffer_writes = ST_BUFFER_WRITES;
4244 STm->do_read_ahead = ST_READ_AHEAD;
4245 STm->default_compression = ST_DONT_TOUCH;
4246 STm->default_blksize = (-1); /* No forced size */
4247 STm->default_density = (-1); /* No forced density */
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004248 STm->tape = tpnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004249 }
4250
4251 for (i = 0; i < ST_NBR_PARTITIONS; i++) {
4252 STps = &(tpnt->ps[i]);
4253 STps->rw = ST_IDLE;
4254 STps->eof = ST_NOEOF;
4255 STps->at_sm = 0;
4256 STps->last_block_valid = 0;
4257 STps->drv_block = (-1);
4258 STps->drv_file = (-1);
4259 }
4260
4261 tpnt->current_mode = 0;
4262 tpnt->modes[0].defined = 1;
4263
4264 tpnt->density_changed = tpnt->compression_changed =
4265 tpnt->blksize_changed = 0;
Matthias Kaehlcke28f85002007-07-29 23:38:15 +02004266 mutex_init(&tpnt->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004267
Tejun Heob98c52b2013-02-27 17:04:42 -08004268 idr_preload(GFP_KERNEL);
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004269 spin_lock(&st_index_lock);
Tejun Heob98c52b2013-02-27 17:04:42 -08004270 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004271 spin_unlock(&st_index_lock);
Tejun Heob98c52b2013-02-27 17:04:42 -08004272 idr_preload_end();
4273 if (error < 0) {
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004274 pr_warn("st: idr allocation failed: %d\n", error);
Joe Lawrence2b5bebc2013-03-05 10:57:56 -05004275 goto out_put_queue;
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004276 }
Tejun Heob98c52b2013-02-27 17:04:42 -08004277 tpnt->index = error;
4278 sprintf(disk->disk_name, "st%d", tpnt->index);
Seymour, Shane M05545c92015-05-06 01:37:20 +00004279 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
4280 if (tpnt->stats == NULL) {
4281 sdev_printk(KERN_ERR, SDp,
4282 "st: Can't allocate statistics.\n");
4283 goto out_idr_remove;
4284 }
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004285
4286 dev_set_drvdata(dev, tpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004287
Linus Torvalds1da177e2005-04-16 15:20:36 -07004288
Jeff Mahoney26898af2012-08-18 15:20:40 -04004289 error = create_cdevs(tpnt);
4290 if (error)
4291 goto out_remove_devs;
Oliver Neukum46a243f2012-01-15 00:16:51 +01004292 scsi_autopm_put_device(SDp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004293
Kai Makisara422528542006-11-07 21:56:38 +02004294 sdev_printk(KERN_NOTICE, SDp,
Rene Herman8b1ea242006-05-20 15:00:22 -07004295 "Attached scsi tape %s\n", tape_name(tpnt));
Kai Makisara422528542006-11-07 21:56:38 +02004296 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
4297 tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
4298 queue_dma_alignment(SDp->request_queue) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004299
4300 return 0;
4301
Jeff Mahoney26898af2012-08-18 15:20:40 -04004302out_remove_devs:
4303 remove_cdevs(tpnt);
Seymour, Shane M05545c92015-05-06 01:37:20 +00004304 kfree(tpnt->stats);
4305out_idr_remove:
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004306 spin_lock(&st_index_lock);
Tejun Heob98c52b2013-02-27 17:04:42 -08004307 idr_remove(&st_index_idr, tpnt->index);
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004308 spin_unlock(&st_index_lock);
Joe Lawrence2b5bebc2013-03-05 10:57:56 -05004309out_put_queue:
4310 blk_put_queue(disk->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004311out_put_disk:
4312 put_disk(disk);
Jesper Juhlc9475cb2005-11-07 01:01:26 -08004313 kfree(tpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004314out_buffer_free:
4315 kfree(buffer);
4316out:
Subhash Jadavani6fe8c1d2014-09-10 14:54:09 +03004317 scsi_autopm_put_device(SDp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004318 return -ENODEV;
4319};
4320
4321
4322static int st_remove(struct device *dev)
4323{
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004324 struct scsi_tape *tpnt = dev_get_drvdata(dev);
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004325 int index = tpnt->index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004326
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004327 scsi_autopm_get_device(to_scsi_device(dev));
Jeff Mahoney26898af2012-08-18 15:20:40 -04004328 remove_cdevs(tpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004329
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004330 mutex_lock(&st_ref_mutex);
4331 kref_put(&tpnt->kref, scsi_tape_release);
4332 mutex_unlock(&st_ref_mutex);
4333 spin_lock(&st_index_lock);
4334 idr_remove(&st_index_idr, index);
4335 spin_unlock(&st_index_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004336 return 0;
4337}
4338
Kai Makisaraf03a5672005-08-02 13:40:47 +03004339/**
4340 * scsi_tape_release - Called to free the Scsi_Tape structure
4341 * @kref: pointer to embedded kref
4342 *
Arjan van de Ven0b950672006-01-11 13:16:10 +01004343 * st_ref_mutex must be held entering this routine. Because it is
Kai Makisaraf03a5672005-08-02 13:40:47 +03004344 * called on last put, you should always use the scsi_tape_get()
4345 * scsi_tape_put() helpers which manipulate the semaphore directly
4346 * and never do a direct kref_put().
4347 **/
4348static void scsi_tape_release(struct kref *kref)
4349{
4350 struct scsi_tape *tpnt = to_scsi_tape(kref);
4351 struct gendisk *disk = tpnt->disk;
4352
4353 tpnt->device = NULL;
4354
4355 if (tpnt->buffer) {
Kai Makisaraf03a5672005-08-02 13:40:47 +03004356 normalize_buffer(tpnt->buffer);
FUJITA Tomonorid0e1ae32008-12-18 14:49:40 +09004357 kfree(tpnt->buffer->reserved_pages);
Kai Makisaraf03a5672005-08-02 13:40:47 +03004358 kfree(tpnt->buffer);
4359 }
4360
4361 disk->private_data = NULL;
4362 put_disk(disk);
Seymour, Shane M05545c92015-05-06 01:37:20 +00004363 kfree(tpnt->stats);
Kai Makisaraf03a5672005-08-02 13:40:47 +03004364 kfree(tpnt);
4365 return;
4366}
4367
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004368static struct class st_sysfs_class = {
4369 .name = "scsi_tape",
Greg Kroah-Hartmanc69c6be2013-07-24 15:05:29 -07004370 .dev_groups = st_dev_groups,
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004371};
4372
Linus Torvalds1da177e2005-04-16 15:20:36 -07004373static int __init init_st(void)
4374{
Jeff Garzik13026a62006-10-04 06:00:38 -04004375 int err;
4376
Linus Torvalds1da177e2005-04-16 15:20:36 -07004377 validate_options();
4378
Jeff Garzik13026a62006-10-04 06:00:38 -04004379 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07004380 verstr, st_fixed_buffer_size, st_max_sg_segs);
4381
Laurence Oberman2bec7082014-10-19 09:44:25 -04004382 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
4383 if (debugging) {
4384 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
4385 debugging);
4386 }
4387
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004388 err = class_register(&st_sysfs_class);
4389 if (err) {
4390 pr_err("Unable register sysfs class for SCSI tapes\n");
4391 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004392 }
4393
Jeff Garzik13026a62006-10-04 06:00:38 -04004394 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4395 ST_MAX_TAPE_ENTRIES, "st");
4396 if (err) {
4397 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
4398 SCSI_TAPE_MAJOR);
4399 goto err_class;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004400 }
Jeff Garzik13026a62006-10-04 06:00:38 -04004401
4402 err = scsi_register_driver(&st_template.gendrv);
4403 if (err)
4404 goto err_chrdev;
4405
Jeff Garzik13026a62006-10-04 06:00:38 -04004406 return 0;
4407
Jeff Garzik13026a62006-10-04 06:00:38 -04004408err_chrdev:
4409 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4410 ST_MAX_TAPE_ENTRIES);
4411err_class:
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004412 class_unregister(&st_sysfs_class);
Jeff Garzik13026a62006-10-04 06:00:38 -04004413 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004414}
4415
4416static void __exit exit_st(void)
4417{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004418 scsi_unregister_driver(&st_template.gendrv);
4419 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
4420 ST_MAX_TAPE_ENTRIES);
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004421 class_unregister(&st_sysfs_class);
Johannes Thumshirn2d3a5d22015-07-08 17:24:01 +02004422 idr_destroy(&st_index_idr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004423 printk(KERN_INFO "st: Unloaded.\n");
4424}
4425
4426module_init(init_st);
4427module_exit(exit_st);
4428
4429
4430/* The sysfs driver interface. Read-only at the moment */
Seymour, Shane M10978e42015-06-24 06:54:35 +00004431static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004432{
Seymour, Shane M10978e42015-06-24 06:54:35 +00004433 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004434}
Seymour, Shane M10978e42015-06-24 06:54:35 +00004435static DRIVER_ATTR_RO(try_direct_io);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004436
Seymour, Shane M10978e42015-06-24 06:54:35 +00004437static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004438{
Seymour, Shane M10978e42015-06-24 06:54:35 +00004439 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004440}
Seymour, Shane M10978e42015-06-24 06:54:35 +00004441static DRIVER_ATTR_RO(fixed_buffer_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004442
Seymour, Shane M10978e42015-06-24 06:54:35 +00004443static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004444{
Seymour, Shane M10978e42015-06-24 06:54:35 +00004445 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004446}
Seymour, Shane M10978e42015-06-24 06:54:35 +00004447static DRIVER_ATTR_RO(max_sg_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004448
Seymour, Shane M10978e42015-06-24 06:54:35 +00004449static ssize_t version_show(struct device_driver *ddd, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004450{
Seymour, Shane M10978e42015-06-24 06:54:35 +00004451 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004452}
Seymour, Shane M10978e42015-06-24 06:54:35 +00004453static DRIVER_ATTR_RO(version);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004454
Seymour, Shane M442d7562015-06-23 08:11:00 +00004455static struct attribute *st_drv_attrs[] = {
4456 &driver_attr_try_direct_io.attr,
4457 &driver_attr_fixed_buffer_size.attr,
4458 &driver_attr_max_sg_segs.attr,
4459 &driver_attr_version.attr,
4460 NULL,
4461};
4462ATTRIBUTE_GROUPS(st_drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004463
Linus Torvalds1da177e2005-04-16 15:20:36 -07004464/* The sysfs simple class interface */
Tony Jonesee959b02008-02-22 00:13:36 +01004465static ssize_t
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004466defined_show(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004467{
James Bottomley7d15d6a2008-03-14 14:12:43 -07004468 struct st_modedef *STm = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004469 ssize_t l = 0;
4470
4471 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
4472 return l;
4473}
Greg Kroah-Hartmanc69c6be2013-07-24 15:05:29 -07004474static DEVICE_ATTR_RO(defined);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004475
Tony Jonesee959b02008-02-22 00:13:36 +01004476static ssize_t
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004477default_blksize_show(struct device *dev, struct device_attribute *attr,
4478 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004479{
James Bottomley7d15d6a2008-03-14 14:12:43 -07004480 struct st_modedef *STm = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004481 ssize_t l = 0;
4482
4483 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
4484 return l;
4485}
Greg Kroah-Hartmanc69c6be2013-07-24 15:05:29 -07004486static DEVICE_ATTR_RO(default_blksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004487
Tony Jonesee959b02008-02-22 00:13:36 +01004488static ssize_t
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004489default_density_show(struct device *dev, struct device_attribute *attr,
4490 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004491{
James Bottomley7d15d6a2008-03-14 14:12:43 -07004492 struct st_modedef *STm = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004493 ssize_t l = 0;
4494 char *fmt;
4495
4496 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
4497 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
4498 return l;
4499}
Greg Kroah-Hartmanc69c6be2013-07-24 15:05:29 -07004500static DEVICE_ATTR_RO(default_density);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004501
Tony Jonesee959b02008-02-22 00:13:36 +01004502static ssize_t
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004503default_compression_show(struct device *dev, struct device_attribute *attr,
4504 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004505{
James Bottomley7d15d6a2008-03-14 14:12:43 -07004506 struct st_modedef *STm = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004507 ssize_t l = 0;
4508
4509 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
4510 return l;
4511}
Greg Kroah-Hartmanc69c6be2013-07-24 15:05:29 -07004512static DEVICE_ATTR_RO(default_compression);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004513
Tony Jonesee959b02008-02-22 00:13:36 +01004514static ssize_t
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004515options_show(struct device *dev, struct device_attribute *attr, char *buf)
Kai Makisarab174be02008-02-24 22:29:12 +02004516{
James Bottomley7d15d6a2008-03-14 14:12:43 -07004517 struct st_modedef *STm = dev_get_drvdata(dev);
Jeff Mahoney6c648d92012-08-18 15:20:39 -04004518 struct scsi_tape *STp = STm->tape;
4519 int options;
Kai Makisarab174be02008-02-24 22:29:12 +02004520 ssize_t l = 0;
4521
Kai Makisarab174be02008-02-24 22:29:12 +02004522 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
4523 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
4524 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
4525 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
4526 options |= STp->two_fm ? MT_ST_TWO_FM : 0;
4527 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
4528 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
4529 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
4530 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
4531 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
4532 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
4533 options |= STm->sysv ? MT_ST_SYSV : 0;
4534 options |= STp->immediate ? MT_ST_NOWAIT : 0;
Lee Duncanc743e442012-03-01 12:41:01 -08004535 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
Kai Makisarab174be02008-02-24 22:29:12 +02004536 options |= STp->sili ? MT_ST_SILI : 0;
4537
4538 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
4539 return l;
4540}
Greg Kroah-Hartmanc69c6be2013-07-24 15:05:29 -07004541static DEVICE_ATTR_RO(options);
Kai Makisarab174be02008-02-24 22:29:12 +02004542
Seymour, Shane M05545c92015-05-06 01:37:20 +00004543/* Support for tape stats */
4544
4545/**
4546 * read_cnt_show - return read count - count of reads made from tape drive
4547 * @dev: struct device
4548 * @attr: attribute structure
4549 * @buf: buffer to return formatted data in
4550 */
4551static ssize_t read_cnt_show(struct device *dev,
4552 struct device_attribute *attr, char *buf)
4553{
4554 struct st_modedef *STm = dev_get_drvdata(dev);
4555
4556 return sprintf(buf, "%lld",
4557 (long long)atomic64_read(&STm->tape->stats->read_cnt));
4558}
4559static DEVICE_ATTR_RO(read_cnt);
4560
4561/**
4562 * read_byte_cnt_show - return read byte count - tape drives
4563 * may use blocks less than 512 bytes this gives the raw byte count of
4564 * of data read from the tape drive.
4565 * @dev: struct device
4566 * @attr: attribute structure
4567 * @buf: buffer to return formatted data in
4568 */
4569static ssize_t read_byte_cnt_show(struct device *dev,
4570 struct device_attribute *attr, char *buf)
4571{
4572 struct st_modedef *STm = dev_get_drvdata(dev);
4573
4574 return sprintf(buf, "%lld",
4575 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
4576}
4577static DEVICE_ATTR_RO(read_byte_cnt);
4578
4579/**
4580 * read_us_show - return read us - overall time spent waiting on reads in ns.
4581 * @dev: struct device
4582 * @attr: attribute structure
4583 * @buf: buffer to return formatted data in
4584 */
4585static ssize_t read_ns_show(struct device *dev,
4586 struct device_attribute *attr, char *buf)
4587{
4588 struct st_modedef *STm = dev_get_drvdata(dev);
4589
4590 return sprintf(buf, "%lld",
4591 (long long)atomic64_read(&STm->tape->stats->tot_read_time));
4592}
4593static DEVICE_ATTR_RO(read_ns);
4594
4595/**
4596 * write_cnt_show - write count - number of user calls
4597 * to write(2) that have written data to tape.
4598 * @dev: struct device
4599 * @attr: attribute structure
4600 * @buf: buffer to return formatted data in
4601 */
4602static ssize_t write_cnt_show(struct device *dev,
4603 struct device_attribute *attr, char *buf)
4604{
4605 struct st_modedef *STm = dev_get_drvdata(dev);
4606
4607 return sprintf(buf, "%lld",
4608 (long long)atomic64_read(&STm->tape->stats->write_cnt));
4609}
4610static DEVICE_ATTR_RO(write_cnt);
4611
4612/**
4613 * write_byte_cnt_show - write byte count - raw count of
4614 * bytes written to tape.
4615 * @dev: struct device
4616 * @attr: attribute structure
4617 * @buf: buffer to return formatted data in
4618 */
4619static ssize_t write_byte_cnt_show(struct device *dev,
4620 struct device_attribute *attr, char *buf)
4621{
4622 struct st_modedef *STm = dev_get_drvdata(dev);
4623
4624 return sprintf(buf, "%lld",
4625 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
4626}
4627static DEVICE_ATTR_RO(write_byte_cnt);
4628
4629/**
4630 * write_ns_show - write ns - number of nanoseconds waiting on write
4631 * requests to complete.
4632 * @dev: struct device
4633 * @attr: attribute structure
4634 * @buf: buffer to return formatted data in
4635 */
4636static ssize_t write_ns_show(struct device *dev,
4637 struct device_attribute *attr, char *buf)
4638{
4639 struct st_modedef *STm = dev_get_drvdata(dev);
4640
4641 return sprintf(buf, "%lld",
4642 (long long)atomic64_read(&STm->tape->stats->tot_write_time));
4643}
4644static DEVICE_ATTR_RO(write_ns);
4645
4646/**
4647 * in_flight_show - number of I/Os currently in flight -
4648 * in most cases this will be either 0 or 1. It may be higher if someone
4649 * has also issued other SCSI commands such as via an ioctl.
4650 * @dev: struct device
4651 * @attr: attribute structure
4652 * @buf: buffer to return formatted data in
4653 */
4654static ssize_t in_flight_show(struct device *dev,
4655 struct device_attribute *attr, char *buf)
4656{
4657 struct st_modedef *STm = dev_get_drvdata(dev);
4658
4659 return sprintf(buf, "%lld",
4660 (long long)atomic64_read(&STm->tape->stats->in_flight));
4661}
4662static DEVICE_ATTR_RO(in_flight);
4663
4664/**
4665 * io_ns_show - io wait ns - this is the number of ns spent
4666 * waiting on all I/O to complete. This includes tape movement commands
4667 * such as rewinding, seeking to end of file or tape, it also includes
4668 * read and write. To determine the time spent on tape movement
4669 * subtract the read and write ns from this value.
4670 * @dev: struct device
4671 * @attr: attribute structure
4672 * @buf: buffer to return formatted data in
4673 */
4674static ssize_t io_ns_show(struct device *dev,
4675 struct device_attribute *attr, char *buf)
4676{
4677 struct st_modedef *STm = dev_get_drvdata(dev);
4678
4679 return sprintf(buf, "%lld",
4680 (long long)atomic64_read(&STm->tape->stats->tot_io_time));
4681}
4682static DEVICE_ATTR_RO(io_ns);
4683
4684/**
4685 * other_cnt_show - other io count - this is the number of
4686 * I/O requests other than read and write requests.
4687 * Typically these are tape movement requests but will include driver
4688 * tape movement. This includes only requests issued by the st driver.
4689 * @dev: struct device
4690 * @attr: attribute structure
4691 * @buf: buffer to return formatted data in
4692 */
4693static ssize_t other_cnt_show(struct device *dev,
4694 struct device_attribute *attr, char *buf)
4695{
4696 struct st_modedef *STm = dev_get_drvdata(dev);
4697
4698 return sprintf(buf, "%lld",
4699 (long long)atomic64_read(&STm->tape->stats->other_cnt));
4700}
4701static DEVICE_ATTR_RO(other_cnt);
4702
4703/**
4704 * resid_cnt_show - A count of the number of times we get a residual
4705 * count - this should indicate someone issuing reads larger than the
4706 * block size on tape.
4707 * @dev: struct device
4708 * @attr: attribute structure
4709 * @buf: buffer to return formatted data in
4710 */
4711static ssize_t resid_cnt_show(struct device *dev,
4712 struct device_attribute *attr, char *buf)
4713{
4714 struct st_modedef *STm = dev_get_drvdata(dev);
4715
4716 return sprintf(buf, "%lld",
4717 (long long)atomic64_read(&STm->tape->stats->resid_cnt));
4718}
4719static DEVICE_ATTR_RO(resid_cnt);
4720
Greg Kroah-Hartmanc69c6be2013-07-24 15:05:29 -07004721static struct attribute *st_dev_attrs[] = {
4722 &dev_attr_defined.attr,
4723 &dev_attr_default_blksize.attr,
4724 &dev_attr_default_density.attr,
4725 &dev_attr_default_compression.attr,
4726 &dev_attr_options.attr,
4727 NULL,
Jeff Mahoneyaf237822012-08-18 15:20:37 -04004728};
Seymour, Shane M05545c92015-05-06 01:37:20 +00004729
4730static struct attribute *st_stats_attrs[] = {
4731 &dev_attr_read_cnt.attr,
4732 &dev_attr_read_byte_cnt.attr,
4733 &dev_attr_read_ns.attr,
4734 &dev_attr_write_cnt.attr,
4735 &dev_attr_write_byte_cnt.attr,
4736 &dev_attr_write_ns.attr,
4737 &dev_attr_in_flight.attr,
4738 &dev_attr_io_ns.attr,
4739 &dev_attr_other_cnt.attr,
4740 &dev_attr_resid_cnt.attr,
4741 NULL,
4742};
4743
4744static struct attribute_group stats_group = {
4745 .name = "stats",
4746 .attrs = st_stats_attrs,
4747};
4748
4749static struct attribute_group st_group = {
4750 .attrs = st_dev_attrs,
4751};
4752
4753static const struct attribute_group *st_dev_groups[] = {
4754 &st_group,
4755 &stats_group,
4756 NULL,
4757};
Kai Makisarab174be02008-02-24 22:29:12 +02004758
Linus Torvalds1da177e2005-04-16 15:20:36 -07004759/* The following functions may be useful for a larger audience. */
FUJITA Tomonori66207422008-12-18 14:49:43 +09004760static int sgl_map_user_pages(struct st_buffer *STbp,
4761 const unsigned int max_pages, unsigned long uaddr,
4762 size_t count, int rw)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004763{
James Bottomley07542b82005-08-31 20:27:22 -04004764 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
4765 unsigned long start = uaddr >> PAGE_SHIFT;
4766 const int nr_pages = end - start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004767 int res, i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004768 struct page **pages;
FUJITA Tomonori66207422008-12-18 14:49:43 +09004769 struct rq_map_data *mdata = &STbp->map_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004770
Linus Torvalds1da177e2005-04-16 15:20:36 -07004771 /* User attempted Overflow! */
4772 if ((uaddr + count) < uaddr)
4773 return -EINVAL;
4774
4775 /* Too big */
4776 if (nr_pages > max_pages)
4777 return -ENOMEM;
4778
4779 /* Hmm? */
4780 if (count == 0)
4781 return 0;
4782
4783 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == NULL)
4784 return -ENOMEM;
4785
4786 /* Try to fault in all of the necessary pages */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004787 /* rw==READ means read from drive, write into memory area */
Andrea Arcangeli7e339122015-02-11 15:27:26 -08004788 res = get_user_pages_unlocked(
Linus Torvalds1da177e2005-04-16 15:20:36 -07004789 current,
4790 current->mm,
4791 uaddr,
4792 nr_pages,
4793 rw == READ,
4794 0, /* don't force */
Andrea Arcangeli7e339122015-02-11 15:27:26 -08004795 pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004796
4797 /* Errors and no page mapped should return here */
4798 if (res < nr_pages)
4799 goto out_unmap;
4800
4801 for (i=0; i < nr_pages; i++) {
4802 /* FIXME: flush superflous for rw==READ,
4803 * probably wrong function for rw==WRITE
4804 */
4805 flush_dcache_page(pages[i]);
4806 }
4807
FUJITA Tomonori66207422008-12-18 14:49:43 +09004808 mdata->offset = uaddr & ~PAGE_MASK;
FUJITA Tomonori66207422008-12-18 14:49:43 +09004809 STbp->mapped_pages = pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004810
Linus Torvalds1da177e2005-04-16 15:20:36 -07004811 return nr_pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004812 out_unmap:
4813 if (res > 0) {
4814 for (j=0; j < res; j++)
4815 page_cache_release(pages[j]);
Hugh Dickins6bc733e2005-12-01 20:21:57 +00004816 res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004817 }
4818 kfree(pages);
4819 return res;
4820}
4821
4822
4823/* And unmap them... */
FUJITA Tomonori66207422008-12-18 14:49:43 +09004824static int sgl_unmap_user_pages(struct st_buffer *STbp,
4825 const unsigned int nr_pages, int dirtied)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004826{
4827 int i;
4828
4829 for (i=0; i < nr_pages; i++) {
FUJITA Tomonori66207422008-12-18 14:49:43 +09004830 struct page *page = STbp->mapped_pages[i];
Nick Pigginb5810032005-10-29 18:16:12 -07004831
Nick Pigginb5810032005-10-29 18:16:12 -07004832 if (dirtied)
4833 SetPageDirty(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004834 /* FIXME: cache flush missing for rw==READ
4835 * FIXME: call the correct reference counting function
4836 */
Nick Pigginb5810032005-10-29 18:16:12 -07004837 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004838 }
FUJITA Tomonori66207422008-12-18 14:49:43 +09004839 kfree(STbp->mapped_pages);
4840 STbp->mapped_pages = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004841
4842 return 0;
4843}