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-rw-r--r--drivers/scsi/st.c947
1 files changed, 519 insertions, 428 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 0a52d9d2da2..14eb4b256a0 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -9,7 +9,7 @@
Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
Michael Schaefer, J"org Weule, and Eric Youngdale.
- Copyright 1992 - 2008 Kai Makisara
+ Copyright 1992 - 2010 Kai Makisara
email Kai.Makisara@kolumbus.fi
Some small formal changes - aeb, 950809
@@ -17,7 +17,7 @@
Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
*/
-static const char *verstr = "20080221";
+static const char *verstr = "20101219";
#include <linux/module.h>
@@ -27,6 +27,7 @@ static const char *verstr = "20080221";
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/string.h>
+#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/mtio.h>
#include <linux/cdrom.h>
@@ -36,12 +37,12 @@ static const char *verstr = "20080221";
#include <linux/blkdev.h>
#include <linux/moduleparam.h>
#include <linux/cdev.h>
+#include <linux/idr.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <asm/dma.h>
-#include <asm/system.h>
#include <scsi/scsi.h>
#include <scsi/scsi_dbg.h>
@@ -80,10 +81,8 @@ static int try_direct_io = TRY_DIRECT_IO;
static int try_rdio = 1;
static int try_wdio = 1;
-static int st_dev_max;
-static int st_nr_dev;
-
-static struct class *st_sysfs_class;
+static struct class st_sysfs_class;
+static const struct attribute_group *st_dev_groups[];
MODULE_AUTHOR("Kai Makisara");
MODULE_DESCRIPTION("SCSI tape (st) driver");
@@ -172,33 +171,27 @@ static int debugging = DEBUG;
24 bits) */
#define SET_DENS_AND_BLK 0x10001
-static DEFINE_RWLOCK(st_dev_arr_lock);
-
static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
static int st_max_sg_segs = ST_MAX_SG;
-static struct scsi_tape **scsi_tapes = NULL;
-
static int modes_defined;
-static struct st_buffer *new_tape_buffer(int, int, int);
static int enlarge_buffer(struct st_buffer *, int, int);
+static void clear_buffer(struct st_buffer *);
static void normalize_buffer(struct st_buffer *);
static int append_to_buffer(const char __user *, struct st_buffer *, int);
static int from_buffer(struct st_buffer *, char __user *, int);
static void move_buffer_data(struct st_buffer *, int);
-static void buf_to_sg(struct st_buffer *, unsigned int);
-static int sgl_map_user_pages(struct scatterlist *, const unsigned int,
+static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
unsigned long, size_t, int);
-static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int);
+static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
static int st_probe(struct device *);
static int st_remove(struct device *);
static int do_create_sysfs_files(void);
static void do_remove_sysfs_files(void);
-static int do_create_class_files(struct scsi_tape *, int, int);
static struct scsi_driver st_template = {
.owner = THIS_MODULE,
@@ -221,6 +214,10 @@ static void scsi_tape_release(struct kref *);
#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
static DEFINE_MUTEX(st_ref_mutex);
+static DEFINE_SPINLOCK(st_index_lock);
+static DEFINE_SPINLOCK(st_use_lock);
+static DEFINE_IDR(st_index_idr);
+
#include "osst_detect.h"
@@ -238,10 +235,9 @@ static struct scsi_tape *scsi_tape_get(int dev)
struct scsi_tape *STp = NULL;
mutex_lock(&st_ref_mutex);
- write_lock(&st_dev_arr_lock);
+ spin_lock(&st_index_lock);
- if (dev < st_dev_max && scsi_tapes != NULL)
- STp = scsi_tapes[dev];
+ STp = idr_find(&st_index_idr, dev);
if (!STp) goto out;
kref_get(&STp->kref);
@@ -258,7 +254,7 @@ out_put:
kref_put(&STp->kref, scsi_tape_release);
STp = NULL;
out:
- write_unlock(&st_dev_arr_lock);
+ spin_unlock(&st_index_lock);
mutex_unlock(&st_ref_mutex);
return STp;
}
@@ -374,9 +370,9 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
if (!debugging) { /* Abnormal conditions for tape */
if (!cmdstatp->have_sense)
printk(KERN_WARNING
- "%s: Error %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n",
- name, result, suggestion(result),
- driver_byte(result) & DRIVER_MASK, host_byte(result));
+ "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n",
+ name, result, driver_byte(result),
+ host_byte(result));
else if (cmdstatp->have_sense &&
scode != NO_SENSE &&
scode != RECOVERED_ERROR &&
@@ -433,29 +429,87 @@ static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
return (-EIO);
}
+static struct st_request *st_allocate_request(struct scsi_tape *stp)
+{
+ struct st_request *streq;
+
+ streq = kzalloc(sizeof(*streq), GFP_KERNEL);
+ if (streq)
+ streq->stp = stp;
+ else {
+ DEBC(printk(KERN_ERR "%s: Can't get SCSI request.\n",
+ tape_name(stp)););
+ if (signal_pending(current))
+ stp->buffer->syscall_result = -EINTR;
+ else
+ stp->buffer->syscall_result = -EBUSY;
+ }
+
+ return streq;
+}
-/* Wakeup from interrupt */
-static void st_sleep_done(void *data, char *sense, int result, int resid)
+static void st_release_request(struct st_request *streq)
+{
+ kfree(streq);
+}
+
+static void st_scsi_execute_end(struct request *req, int uptodate)
{
- struct st_request *SRpnt = data;
+ struct st_request *SRpnt = req->end_io_data;
struct scsi_tape *STp = SRpnt->stp;
+ struct bio *tmp;
- memcpy(SRpnt->sense, sense, SCSI_SENSE_BUFFERSIZE);
- (STp->buffer)->cmdstat.midlevel_result = SRpnt->result = result;
- DEB( STp->write_pending = 0; )
+ STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
+ STp->buffer->cmdstat.residual = req->resid_len;
+ tmp = SRpnt->bio;
if (SRpnt->waiting)
complete(SRpnt->waiting);
-}
-static struct st_request *st_allocate_request(void)
-{
- return kzalloc(sizeof(struct st_request), GFP_KERNEL);
+ blk_rq_unmap_user(tmp);
+ __blk_put_request(req->q, req);
}
-static void st_release_request(struct st_request *streq)
+static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
+ int data_direction, void *buffer, unsigned bufflen,
+ int timeout, int retries)
{
- kfree(streq);
+ struct request *req;
+ struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
+ int err = 0;
+ int write = (data_direction == DMA_TO_DEVICE);
+
+ req = blk_get_request(SRpnt->stp->device->request_queue, write,
+ GFP_KERNEL);
+ if (!req)
+ return DRIVER_ERROR << 24;
+
+ blk_rq_set_block_pc(req);
+ req->cmd_flags |= REQ_QUIET;
+
+ mdata->null_mapped = 1;
+
+ if (bufflen) {
+ err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
+ GFP_KERNEL);
+ if (err) {
+ blk_put_request(req);
+ return DRIVER_ERROR << 24;
+ }
+ }
+
+ SRpnt->bio = req->bio;
+ req->cmd_len = COMMAND_SIZE(cmd[0]);
+ memset(req->cmd, 0, BLK_MAX_CDB);
+ memcpy(req->cmd, cmd, req->cmd_len);
+ req->sense = SRpnt->sense;
+ req->sense_len = 0;
+ req->timeout = timeout;
+ req->retries = retries;
+ req->end_io_data = SRpnt;
+
+ blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end);
+ return 0;
}
/* Do the scsi command. Waits until command performed if do_wait is true.
@@ -466,6 +520,8 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd
int bytes, int direction, int timeout, int retries, int do_wait)
{
struct completion *waiting;
+ struct rq_map_data *mdata = &STp->buffer->map_data;
+ int ret;
/* if async, make sure there's no command outstanding */
if (!do_wait && ((STp->buffer)->last_SRpnt)) {
@@ -478,18 +534,10 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd
return NULL;
}
- if (SRpnt == NULL) {
- SRpnt = st_allocate_request();
- if (SRpnt == NULL) {
- DEBC( printk(KERN_ERR "%s: Can't get SCSI request.\n",
- tape_name(STp)); );
- if (signal_pending(current))
- (STp->buffer)->syscall_result = (-EINTR);
- else
- (STp->buffer)->syscall_result = (-EBUSY);
+ if (!SRpnt) {
+ SRpnt = st_allocate_request(STp);
+ if (!SRpnt)
return NULL;
- }
- SRpnt->stp = STp;
}
/* If async IO, set last_SRpnt. This ptr tells write_behind_check
@@ -501,21 +549,29 @@ st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd
init_completion(waiting);
SRpnt->waiting = waiting;
- if (!STp->buffer->do_dio)
- buf_to_sg(STp->buffer, bytes);
+ if (STp->buffer->do_dio) {
+ mdata->page_order = 0;
+ mdata->nr_entries = STp->buffer->sg_segs;
+ mdata->pages = STp->buffer->mapped_pages;
+ } else {
+ mdata->page_order = STp->buffer->reserved_page_order;
+ mdata->nr_entries =
+ DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
+ mdata->pages = STp->buffer->reserved_pages;
+ mdata->offset = 0;
+ }
memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
STp->buffer->cmdstat.have_sense = 0;
STp->buffer->syscall_result = 0;
- if (scsi_execute_async(STp->device, cmd, COMMAND_SIZE(cmd[0]), direction,
- &((STp->buffer)->sg[0]), bytes, (STp->buffer)->sg_segs,
- timeout, retries, SRpnt, st_sleep_done, GFP_KERNEL)) {
+ ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout,
+ retries);
+ if (ret) {
/* could not allocate the buffer or request was too large */
(STp->buffer)->syscall_result = (-EBUSY);
(STp->buffer)->last_SRpnt = NULL;
- }
- else if (do_wait) {
+ } else if (do_wait) {
wait_for_completion(waiting);
SRpnt->waiting = NULL;
(STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
@@ -610,7 +666,8 @@ static int cross_eof(struct scsi_tape * STp, int forward)
tape_name(STp), forward ? "forward" : "backward"));
SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
- STp->device->timeout, MAX_RETRIES, 1);
+ STp->device->request_queue->rq_timeout,
+ MAX_RETRIES, 1);
if (!SRpnt)
return (STp->buffer)->syscall_result;
@@ -626,9 +683,9 @@ static int cross_eof(struct scsi_tape * STp, int forward)
/* Flush the write buffer (never need to write if variable blocksize). */
-static int flush_write_buffer(struct scsi_tape * STp)
+static int st_flush_write_buffer(struct scsi_tape * STp)
{
- int offset, transfer, blks;
+ int transfer, blks;
int result;
unsigned char cmd[MAX_COMMAND_SIZE];
struct st_request *SRpnt;
@@ -641,14 +698,10 @@ static int flush_write_buffer(struct scsi_tape * STp)
result = 0;
if (STp->dirty == 1) {
- offset = (STp->buffer)->buffer_bytes;
- transfer = ((offset + STp->block_size - 1) /
- STp->block_size) * STp->block_size;
+ transfer = STp->buffer->buffer_bytes;
DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n",
tape_name(STp), transfer));
- memset((STp->buffer)->b_data + offset, 0, transfer - offset);
-
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = WRITE_6;
cmd[1] = 1;
@@ -658,7 +711,8 @@ static int flush_write_buffer(struct scsi_tape * STp)
cmd[4] = blks;
SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
- STp->device->timeout, MAX_WRITE_RETRIES, 1);
+ STp->device->request_queue->rq_timeout,
+ MAX_WRITE_RETRIES, 1);
if (!SRpnt)
return (STp->buffer)->syscall_result;
@@ -717,7 +771,7 @@ static int flush_buffer(struct scsi_tape *STp, int seek_next)
return 0;
STps = &(STp->ps[STp->partition]);
if (STps->rw == ST_WRITING) /* Writing */
- return flush_write_buffer(STp);
+ return st_flush_write_buffer(STp);
if (STp->block_size == 0)
return 0;
@@ -923,7 +977,7 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
struct st_modedef *STm;
struct st_partstat *STps;
char *name = tape_name(STp);
- struct inode *inode = filp->f_path.dentry->d_inode;
+ struct inode *inode = file_inode(filp);
int mode = TAPE_MODE(inode);
STp->ready = ST_READY;
@@ -988,7 +1042,8 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
cmd[0] = READ_BLOCK_LIMITS;
SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
- STp->device->timeout, MAX_READY_RETRIES, 1);
+ STp->device->request_queue->rq_timeout,
+ MAX_READY_RETRIES, 1);
if (!SRpnt) {
retval = (STp->buffer)->syscall_result;
goto err_out;
@@ -1015,7 +1070,8 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
cmd[4] = 12;
SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
- STp->device->timeout, MAX_READY_RETRIES, 1);
+ STp->device->request_queue->rq_timeout,
+ MAX_READY_RETRIES, 1);
if (!SRpnt) {
retval = (STp->buffer)->syscall_result;
goto err_out;
@@ -1045,6 +1101,12 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
STp->drv_buffer));
}
STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
+ if (!STp->drv_buffer && STp->immediate_filemark) {
+ printk(KERN_WARNING
+ "%s: non-buffered tape: disabling writing immediate filemarks\n",
+ name);
+ STp->immediate_filemark = 0;
+ }
}
st_release_request(SRpnt);
SRpnt = NULL;
@@ -1111,11 +1173,12 @@ static int check_tape(struct scsi_tape *STp, struct file *filp)
}
- /* Open the device. Needs to be called with BKL only because of incrementing the SCSI host
+ /* Open the device. Needs to take the BKL only because of incrementing the SCSI host
module count. */
static int st_open(struct inode *inode, struct file *filp)
{
int i, retval = (-EIO);
+ int resumed = 0;
struct scsi_tape *STp;
struct st_partstat *STps;
int dev = TAPE_NR(inode);
@@ -1128,24 +1191,30 @@ static int st_open(struct inode *inode, struct file *filp)
*/
filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
- if (!(STp = scsi_tape_get(dev)))
+ if (!(STp = scsi_tape_get(dev))) {
return -ENXIO;
+ }
- write_lock(&st_dev_arr_lock);
filp->private_data = STp;
name = tape_name(STp);
+ spin_lock(&st_use_lock);
if (STp->in_use) {
- write_unlock(&st_dev_arr_lock);
+ spin_unlock(&st_use_lock);
scsi_tape_put(STp);
DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); )
return (-EBUSY);
}
STp->in_use = 1;
- write_unlock(&st_dev_arr_lock);
+ spin_unlock(&st_use_lock);
STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0;
+ if (scsi_autopm_get_device(STp->device) < 0) {
+ retval = -EIO;
+ goto err_out;
+ }
+ resumed = 1;
if (!scsi_block_when_processing_errors(STp->device)) {
retval = (-ENXIO);
goto err_out;
@@ -1159,6 +1228,7 @@ static int st_open(struct inode *inode, struct file *filp)
goto err_out;
}
+ (STp->buffer)->cleared = 0;
(STp->buffer)->writing = 0;
(STp->buffer)->syscall_result = 0;
@@ -1189,8 +1259,12 @@ static int st_open(struct inode *inode, struct file *filp)
err_out:
normalize_buffer(STp->buffer);
+ spin_lock(&st_use_lock);
STp->in_use = 0;
+ spin_unlock(&st_use_lock);
scsi_tape_put(STp);
+ if (resumed)
+ scsi_autopm_put_device(STp->device);
return retval;
}
@@ -1211,7 +1285,7 @@ static int st_flush(struct file *filp, fl_owner_t id)
return 0;
if (STps->rw == ST_WRITING && !STp->pos_unknown) {
- result = flush_write_buffer(STp);
+ result = st_flush_write_buffer(STp);
if (result != 0 && result != (-ENOSPC))
goto out;
}
@@ -1238,10 +1312,13 @@ static int st_flush(struct file *filp, fl_owner_t id)
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = WRITE_FILEMARKS;
+ if (STp->immediate_filemark)
+ cmd[1] = 1;
cmd[4] = 1 + STp->two_fm;
SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
- STp->device->timeout, MAX_WRITE_RETRIES, 1);
+ STp->device->request_queue->rq_timeout,
+ MAX_WRITE_RETRIES, 1);
if (!SRpnt) {
result = (STp->buffer)->syscall_result;
goto out;
@@ -1319,9 +1396,10 @@ static int st_release(struct inode *inode, struct file *filp)
do_door_lock(STp, 0);
normalize_buffer(STp->buffer);
- write_lock(&st_dev_arr_lock);
+ spin_lock(&st_use_lock);
STp->in_use = 0;
- write_unlock(&st_dev_arr_lock);
+ spin_unlock(&st_use_lock);
+ scsi_autopm_put_device(STp->device);
scsi_tape_put(STp);
return result;
@@ -1408,8 +1486,8 @@ static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
if (i && ((unsigned long)buf & queue_dma_alignment(
STp->device->request_queue)) == 0) {
- i = sgl_map_user_pages(&(STbp->sg[0]), STbp->use_sg,
- (unsigned long)buf, count, (is_read ? READ : WRITE));
+ i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf,
+ count, (is_read ? READ : WRITE));
if (i > 0) {
STbp->do_dio = i;
STbp->buffer_bytes = 0; /* can be used as transfer counter */
@@ -1417,7 +1495,6 @@ static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
else
STbp->do_dio = 0; /* fall back to buffering with any error */
STbp->sg_segs = STbp->do_dio;
- STbp->frp_sg_current = 0;
DEB(
if (STbp->do_dio) {
STp->nbr_dio++;
@@ -1432,8 +1509,14 @@ static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
if (STp->block_size)
bufsize = STp->block_size > st_fixed_buffer_size ?
STp->block_size : st_fixed_buffer_size;
- else
+ else {
bufsize = count;
+ /* Make sure that data from previous user is not leaked even if
+ HBA does not return correct residual */
+ if (is_read && STp->sili && !STbp->cleared)
+ clear_buffer(STbp);
+ }
+
if (bufsize > STbp->buffer_size &&
!enlarge_buffer(STbp, bufsize, STp->restr_dma)) {
printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n",
@@ -1457,7 +1540,7 @@ static void release_buffering(struct scsi_tape *STp, int is_read)
STbp = STp->buffer;
if (STbp->do_dio) {
- sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, is_read);
+ sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
STbp->do_dio = 0;
STbp->sg_segs = 0;
}
@@ -1622,7 +1705,8 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
cmd[4] = blks;
SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
- STp->device->timeout, MAX_WRITE_RETRIES, !async_write);
+ STp->device->request_queue->rq_timeout,
+ MAX_WRITE_RETRIES, !async_write);
if (!SRpnt) {
retval = STbp->syscall_result;
goto out;
@@ -1654,6 +1738,7 @@ st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
if (undone <= do_count) {
/* Only data from this write is not written */
count += undone;
+ b_point -= undone;
do_count -= undone;
if (STp->block_size)
blks = (transfer - undone) / STp->block_size;
@@ -1783,13 +1868,16 @@ static long read_tape(struct scsi_tape *STp, long count,
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = READ_6;
cmd[1] = (STp->block_size != 0);
+ if (!cmd[1] && STp->sili)
+ cmd[1] |= 2;
cmd[2] = blks >> 16;
cmd[3] = blks >> 8;
cmd[4] = blks;
SRpnt = *aSRpnt;
SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE,
- STp->device->timeout, MAX_RETRIES, 1);
+ STp->device->request_queue->rq_timeout,
+ MAX_RETRIES, 1);
release_buffering(STp, 1);
*aSRpnt = SRpnt;
if (!SRpnt)
@@ -1911,8 +1999,11 @@ static long read_tape(struct scsi_tape *STp, long count,
}
/* End of error handling */
- else /* Read successful */
+ else { /* Read successful */
STbp->buffer_bytes = bytes;
+ if (STp->sili) /* In fixed block mode residual is always zero here */
+ STbp->buffer_bytes -= STp->buffer->cmdstat.residual;
+ }
if (STps->drv_block >= 0) {
if (STp->block_size == 0)
@@ -2090,7 +2181,9 @@ static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char
name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
STp->scsi2_logical);
printk(KERN_INFO
- "%s: sysv: %d nowait: %d\n", name, STm->sysv, STp->immediate);
+ "%s: sysv: %d nowait: %d sili: %d nowait_filemark: %d\n",
+ name, STm->sysv, STp->immediate, STp->sili,
+ STp->immediate_filemark);
printk(KERN_INFO "%s: debugging: %d\n",
name, debugging);
}
@@ -2105,12 +2198,19 @@ static int st_set_options(struct scsi_tape *STp, long options)
struct st_modedef *STm;
char *name = tape_name(STp);
struct cdev *cd0, *cd1;
+ struct device *d0, *d1;
STm = &(STp->modes[STp->current_mode]);
if (!STm->defined) {
- cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1];
+ cd0 = STm->cdevs[0];
+ cd1 = STm->cdevs[1];
+ d0 = STm->devs[0];
+ d1 = STm->devs[1];
memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef));
- STm->cdevs[0] = cd0; STm->cdevs[1] = cd1;
+ STm->cdevs[0] = cd0;
+ STm->cdevs[1] = cd1;
+ STm->devs[0] = d0;
+ STm->devs[1] = d1;
modes_defined = 1;
DEBC(printk(ST_DEB_MSG
"%s: Initialized mode %d definition from mode 0\n",
@@ -2132,7 +2232,9 @@ static int st_set_options(struct scsi_tape *STp, long options)
STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
STp->immediate = (options & MT_ST_NOWAIT) != 0;
+ STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0;
STm->sysv = (options & MT_ST_SYSV) != 0;
+ STp->sili = (options & MT_ST_SILI) != 0;
DEB( debugging = (options & MT_ST_DEBUGGING) != 0;
st_log_options(STp, STm, name); )
} else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
@@ -2162,8 +2264,12 @@ static int st_set_options(struct scsi_tape *STp, long options)
STp->scsi2_logical = value;
if ((options & MT_ST_NOWAIT) != 0)
STp->immediate = value;
+ if ((options & MT_ST_NOWAIT_EOF) != 0)
+ STp->immediate_filemark = value;
if ((options & MT_ST_SYSV) != 0)
STm->sysv = value;
+ if ((options & MT_ST_SILI) != 0)
+ STp->sili = value;
DEB(
if ((options & MT_ST_DEBUGGING) != 0)
debugging = value;
@@ -2191,14 +2297,16 @@ static int st_set_options(struct scsi_tape *STp, long options)
DEBC( printk(KERN_INFO "%s: Long timeout set to %d seconds.\n", name,
(value & ~MT_ST_SET_LONG_TIMEOUT)));
} else {
- STp->device->timeout = value * HZ;
+ blk_queue_rq_timeout(STp->device->request_queue,
+ value * HZ);
DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n",
name, value) );
}
} else if (code == MT_ST_SET_CLN) {
value = (options & ~MT_ST_OPTIONS) & 0xff;
if (value != 0 &&
- value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE)
+ (value < EXTENDED_SENSE_START ||
+ value >= SCSI_SENSE_BUFFERSIZE))
return (-EINVAL);
STp->cln_mode = value;
STp->cln_sense_mask = (options >> 8) & 0xff;
@@ -2289,7 +2397,7 @@ static int st_set_options(struct scsi_tape *STp, long options)
static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
{
unsigned char cmd[MAX_COMMAND_SIZE];
- struct st_request *SRpnt = NULL;
+ struct st_request *SRpnt;
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = MODE_SENSE;
@@ -2298,14 +2406,14 @@ static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
cmd[2] = page;
cmd[4] = 255;
- SRpnt = st_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE,
- STp->device->timeout, 0, 1);
+ SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
+ STp->device->request_queue->rq_timeout, 0, 1);
if (SRpnt == NULL)
return (STp->buffer)->syscall_result;
st_release_request(SRpnt);
- return (STp->buffer)->syscall_result;
+ return STp->buffer->syscall_result;
}
@@ -2315,7 +2423,8 @@ static int write_mode_page(struct scsi_tape *STp, int page, int slow)
{
int pgo;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct st_request *SRpnt = NULL;
+ struct st_request *SRpnt;
+ int timeout;
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = MODE_SELECT;
@@ -2329,14 +2438,16 @@ static int write_mode_page(struct scsi_tape *STp, int page, int slow)
(STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
(STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
- SRpnt = st_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE,
- (slow ? STp->long_timeout : STp->device->timeout), 0, 1);
+ timeout = slow ?
+ STp->long_timeout : STp->device->request_queue->rq_timeout;
+ SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
+ timeout, 0, 1);
if (SRpnt == NULL)
return (STp->buffer)->syscall_result;
st_release_request(SRpnt);
- return (STp->buffer)->syscall_result;
+ return STp->buffer->syscall_result;
}
@@ -2442,7 +2553,7 @@ static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_cod
}
if (STp->immediate) {
cmd[1] = 1; /* Don't wait for completion */
- timeout = STp->device->timeout;
+ timeout = STp->device->request_queue->rq_timeout;
}
else
timeout = STp->long_timeout;
@@ -2607,18 +2718,22 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
}
break;
case MTWEOF:
+ case MTWEOFI:
case MTWSM:
if (STp->write_prot)
return (-EACCES);
cmd[0] = WRITE_FILEMARKS;
if (cmd_in == MTWSM)
cmd[1] = 2;
+ if (cmd_in == MTWEOFI ||
+ (cmd_in == MTWEOF && STp->immediate_filemark))
+ cmd[1] |= 1;
cmd[2] = (arg >> 16);
cmd[3] = (arg >> 8);
cmd[4] = arg;
- timeout = STp->device->timeout;
+ timeout = STp->device->request_queue->rq_timeout;
DEBC(
- if (cmd_in == MTWEOF)
+ if (cmd_in != MTWSM)
printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name,
cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
else
@@ -2634,7 +2749,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[0] = REZERO_UNIT;
if (STp->immediate) {
cmd[1] = 1; /* Don't wait for completion */
- timeout = STp->device->timeout;
+ timeout = STp->device->request_queue->rq_timeout;
}
DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name));
fileno = blkno = at_sm = 0;
@@ -2647,7 +2762,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[0] = START_STOP;
if (STp->immediate) {
cmd[1] = 1; /* Don't wait for completion */
- timeout = STp->device->timeout;
+ timeout = STp->device->request_queue->rq_timeout;
}
cmd[4] = 3;
DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name));
@@ -2680,7 +2795,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */
if (STp->immediate) {
cmd[1] |= 2; /* Don't wait for completion */
- timeout = STp->device->timeout;
+ timeout = STp->device->request_queue->rq_timeout;
}
else
timeout = STp->long_timeout * 8;
@@ -2732,7 +2847,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
(STp->buffer)->b_data[9] = (ltmp >> 16);
(STp->buffer)->b_data[10] = (ltmp >> 8);
(STp->buffer)->b_data[11] = ltmp;
- timeout = STp->device->timeout;
+ timeout = STp->device->request_queue->rq_timeout;
DEBC(
if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
printk(ST_DEB_MSG
@@ -2774,11 +2889,8 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
ioctl_result = st_int_ioctl(STp, MTBSF, 1);
if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
- int old_block_size = STp->block_size;
STp->block_size = arg & MT_ST_BLKSIZE_MASK;
if (STp->block_size != 0) {
- if (old_block_size == 0)
- normalize_buffer(STp->buffer);
(STp->buffer)->buffer_blocks =
(STp->buffer)->buffer_size / STp->block_size;
}
@@ -2797,8 +2909,8 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
else if (chg_eof)
STps->eof = ST_NOEOF;
- if (cmd_in == MTWEOF)
- STps->rw = ST_IDLE;
+ if (cmd_in == MTWEOF || cmd_in == MTWEOFI)
+ STps->rw = ST_IDLE; /* prevent automatic WEOF at close */
} else { /* SCSI command was not completely successful. Don't return
from this block without releasing the SCSI command block! */
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
@@ -2815,7 +2927,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
else
undone = 0;
- if (cmd_in == MTWEOF &&
+ if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
cmdstatp->have_sense &&
(cmdstatp->flags & SENSE_EOM)) {
if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
@@ -2879,7 +2991,7 @@ static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned lon
!(STp->use_pf & PF_TESTED)) {
/* Try the other possible state of Page Format if not
already tried */
- STp->use_pf = !STp->use_pf | PF_TESTED;
+ STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
st_release_request(SRpnt);
SRpnt = NULL;
return st_int_ioctl(STp, cmd_in, arg);
@@ -2922,7 +3034,8 @@ static int get_location(struct scsi_tape *STp, unsigned int *block, int *partiti
scmd[1] = 1;
}
SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
- STp->device->timeout, MAX_READY_RETRIES, 1);
+ STp->device->request_queue->rq_timeout,
+ MAX_READY_RETRIES, 1);
if (!SRpnt)
return (STp->buffer)->syscall_result;
@@ -3023,7 +3136,7 @@ static int set_location(struct scsi_tape *STp, unsigned int block, int partition
}
if (STp->immediate) {
scmd[1] |= 1; /* Don't wait for completion */
- timeout = STp->device->timeout;
+ timeout = STp->device->request_queue->rq_timeout;
}
SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
@@ -3241,7 +3354,8 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
* may try and take the device offline, in which case all further
* access to the device is prohibited.
*/
- retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p, file);
+ retval = scsi_nonblockable_ioctl(STp->device, cmd_in, p,
+ file->f_flags & O_NDELAY);
if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV)
goto out;
retval = 0;
@@ -3545,8 +3659,8 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
!capable(CAP_SYS_RAWIO))
i = -EPERM;
else
- i = scsi_cmd_ioctl(file, STp->disk->queue,
- STp->disk, cmd_in, p);
+ i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
+ file->f_mode, cmd_in, p);
if (i != -ENOTTY)
return i;
break;
@@ -3582,41 +3696,37 @@ static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long a
/* Try to allocate a new tape buffer. Calling function must not hold
dev_arr_lock. */
-static struct st_buffer *
- new_tape_buffer(int from_initialization, int need_dma, int max_sg)
+static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
{
- int i, got = 0;
- gfp_t priority;
struct st_buffer *tb;
- if (from_initialization)
- priority = GFP_ATOMIC;
- else
- priority = GFP_KERNEL;
-
- i = sizeof(struct st_buffer) + (max_sg - 1) * sizeof(struct scatterlist) +
- max_sg * sizeof(struct st_buf_fragment);
- tb = kzalloc(i, priority);
+ tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
if (!tb) {
printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
return NULL;
}
- tb->frp_segs = tb->orig_frp_segs = 0;
+ tb->frp_segs = 0;
tb->use_sg = max_sg;
- tb->frp = (struct st_buf_fragment *)(&(tb->sg[0]) + max_sg);
-
tb->dma = need_dma;
- tb->buffer_size = got;
- sg_init_table(tb->sg, max_sg);
+ tb->buffer_size = 0;
+
+ tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
+ GFP_ATOMIC);
+ if (!tb->reserved_pages) {
+ kfree(tb);
+ return NULL;
+ }
return tb;
}
/* Try to allocate enough space in the tape buffer */
+#define ST_MAX_ORDER 6
+
static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
{
- int segs, nbr, max_segs, b_size, order, got;
+ int segs, max_segs, b_size, order, got;
gfp_t priority;
if (new_size <= STbuffer->buffer_size)
@@ -3626,56 +3736,80 @@ static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dm
normalize_buffer(STbuffer); /* Avoid extra segment */
max_segs = STbuffer->use_sg;
- nbr = max_segs - STbuffer->frp_segs;
- if (nbr <= 0)
- return 0;
priority = GFP_KERNEL | __GFP_NOWARN;
if (need_dma)
priority |= GFP_DMA;
- for (b_size = PAGE_SIZE, order=0; order <= 6 &&
- b_size < new_size - STbuffer->buffer_size;
- order++, b_size *= 2)
- ; /* empty */
+
+ if (STbuffer->cleared)
+ priority |= __GFP_ZERO;
+
+ if (STbuffer->frp_segs) {
+ order = STbuffer->reserved_page_order;
+ b_size = PAGE_SIZE << order;
+ } else {
+ for (b_size = PAGE_SIZE, order = 0;
+ order < ST_MAX_ORDER &&
+ max_segs * (PAGE_SIZE << order) < new_size;
+ order++, b_size *= 2)
+ ; /* empty */
+ STbuffer->reserved_page_order = order;
+ }
+ if (max_segs * (PAGE_SIZE << order) < new_size) {
+ if (order == ST_MAX_ORDER)
+ return 0;
+ normalize_buffer(STbuffer);
+ return enlarge_buffer(STbuffer, new_size, need_dma);
+ }
for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
segs < max_segs && got < new_size;) {
- STbuffer->frp[segs].page = alloc_pages(priority, order);
- if (STbuffer->frp[segs].page == NULL) {
- if (new_size - got <= (max_segs - segs) * b_size / 2) {
- b_size /= 2; /* Large enough for the rest of the buffers */
- order--;
- continue;
- }
+ struct page *page;
+
+ page = alloc_pages(priority, order);
+ if (!page) {
DEB(STbuffer->buffer_size = got);
normalize_buffer(STbuffer);
return 0;
}
- STbuffer->frp[segs].length = b_size;
+
STbuffer->frp_segs += 1;
got += b_size;
STbuffer->buffer_size = got;
+ STbuffer->reserved_pages[segs] = page;
segs++;
}
- STbuffer->b_data = page_address(STbuffer->frp[0].page);
+ STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
return 1;
}
+/* Make sure that no data from previous user is in the internal buffer */
+static void clear_buffer(struct st_buffer * st_bp)
+{
+ int i;
+
+ for (i=0; i < st_bp->frp_segs; i++)
+ memset(page_address(st_bp->reserved_pages[i]), 0,
+ PAGE_SIZE << st_bp->reserved_page_order);
+ st_bp->cleared = 1;
+}
+
+
/* Release the extra buffer */
static void normalize_buffer(struct st_buffer * STbuffer)
{
- int i, order;
+ int i, order = STbuffer->reserved_page_order;
- for (i = STbuffer->orig_frp_segs; i < STbuffer->frp_segs; i++) {
- order = get_order(STbuffer->frp[i].length);
- __free_pages(STbuffer->frp[i].page, order);
- STbuffer->buffer_size -= STbuffer->frp[i].length;
+ for (i = 0; i < STbuffer->frp_segs; i++) {
+ __free_pages(STbuffer->reserved_pages[i], order);
+ STbuffer->buffer_size -= (PAGE_SIZE << order);
}
- STbuffer->frp_segs = STbuffer->orig_frp_segs;
- STbuffer->frp_sg_current = 0;
+ STbuffer->frp_segs = 0;
STbuffer->sg_segs = 0;
+ STbuffer->reserved_page_order = 0;
+ STbuffer->map_data.offset = 0;
}
@@ -3684,18 +3818,19 @@ static void normalize_buffer(struct st_buffer * STbuffer)
static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
{
int i, cnt, res, offset;
+ int length = PAGE_SIZE << st_bp->reserved_page_order;
for (i = 0, offset = st_bp->buffer_bytes;
- i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++)
- offset -= st_bp->frp[i].length;
+ i < st_bp->frp_segs && offset >= length; i++)
+ offset -= length;
if (i == st_bp->frp_segs) { /* Should never happen */
printk(KERN_WARNING "st: append_to_buffer offset overflow.\n");
return (-EIO);
}
for (; i < st_bp->frp_segs && do_count > 0; i++) {
- cnt = st_bp->frp[i].length - offset < do_count ?
- st_bp->frp[i].length - offset : do_count;
- res = copy_from_user(page_address(st_bp->frp[i].page) + offset, ubp, cnt);
+ struct page *page = st_bp->reserved_pages[i];
+ cnt = length - offset < do_count ? length - offset : do_count;
+ res = copy_from_user(page_address(page) + offset, ubp, cnt);
if (res)
return (-EFAULT);
do_count -= cnt;
@@ -3715,18 +3850,19 @@ static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, in
static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
{
int i, cnt, res, offset;
+ int length = PAGE_SIZE << st_bp->reserved_page_order;
for (i = 0, offset = st_bp->read_pointer;
- i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++)
- offset -= st_bp->frp[i].length;
+ i < st_bp->frp_segs && offset >= length; i++)
+ offset -= length;
if (i == st_bp->frp_segs) { /* Should never happen */
printk(KERN_WARNING "st: from_buffer offset overflow.\n");
return (-EIO);
}
for (; i < st_bp->frp_segs && do_count > 0; i++) {
- cnt = st_bp->frp[i].length - offset < do_count ?
- st_bp->frp[i].length - offset : do_count;
- res = copy_to_user(ubp, page_address(st_bp->frp[i].page) + offset, cnt);
+ struct page *page = st_bp->reserved_pages[i];
+ cnt = length - offset < do_count ? length - offset : do_count;
+ res = copy_to_user(ubp, page_address(page) + offset, cnt);
if (res)
return (-EFAULT);
do_count -= cnt;
@@ -3747,6 +3883,7 @@ static void move_buffer_data(struct st_buffer * st_bp, int offset)
{
int src_seg, dst_seg, src_offset = 0, dst_offset;
int count, total;
+ int length = PAGE_SIZE << st_bp->reserved_page_order;
if (offset == 0)
return;
@@ -3754,24 +3891,26 @@ static void move_buffer_data(struct st_buffer * st_bp, int offset)
total=st_bp->buffer_bytes - offset;
for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
src_offset = offset;
- if (src_offset < st_bp->frp[src_seg].length)
+ if (src_offset < length)
break;
- offset -= st_bp->frp[src_seg].length;
+ offset -= length;
}
st_bp->buffer_bytes = st_bp->read_pointer = total;
for (dst_seg=dst_offset=0; total > 0; ) {
- count = min(st_bp->frp[dst_seg].length - dst_offset,
- st_bp->frp[src_seg].length - src_offset);
- memmove(page_address(st_bp->frp[dst_seg].page) + dst_offset,
- page_address(st_bp->frp[src_seg].page) + src_offset, count);
+ struct page *dpage = st_bp->reserved_pages[dst_seg];
+ struct page *spage = st_bp->reserved_pages[src_seg];
+
+ count = min(length - dst_offset, length - src_offset);
+ memmove(page_address(dpage) + dst_offset,
+ page_address(spage) + src_offset, count);
src_offset += count;
- if (src_offset >= st_bp->frp[src_seg].length) {
+ if (src_offset >= length) {
src_seg++;
src_offset = 0;
}
dst_offset += count;
- if (dst_offset >= st_bp->frp[dst_seg].length) {
+ if (dst_offset >= length) {
dst_seg++;
dst_offset = 0;
}
@@ -3779,32 +3918,6 @@ static void move_buffer_data(struct st_buffer * st_bp, int offset)
}
}
-
-/* Fill the s/g list up to the length required for this transfer */
-static void buf_to_sg(struct st_buffer *STbp, unsigned int length)
-{
- int i;
- unsigned int count;
- struct scatterlist *sg;
- struct st_buf_fragment *frp;
-
- if (length == STbp->frp_sg_current)
- return; /* work already done */
-
- sg = &(STbp->sg[0]);
- frp = STbp->frp;
- for (i=count=0; count < length; i++) {
- if (length - count > frp[i].length)
- sg_set_page(&sg[i], frp[i].page, frp[i].length, 0);
- else
- sg_set_page(&sg[i], frp[i].page, length - count, 0);
- count += sg[i].length;
- }
- STbp->sg_segs = i;
- STbp->frp_sg_current = length;
-}
-
-
/* Validate the options from command line or module parameters */
static void validate_options(void)
{
@@ -3873,18 +3986,101 @@ static const struct file_operations st_fops =
.open = st_open,
.flush = st_flush,
.release = st_release,
+ .llseek = noop_llseek,
};
+static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
+{
+ int i, error;
+ dev_t cdev_devno;
+ struct cdev *cdev;
+ struct device *dev;
+ struct st_modedef *STm = &(tape->modes[mode]);
+ char name[10];
+ int dev_num = tape->index;
+
+ cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
+
+ cdev = cdev_alloc();
+ if (!cdev) {
+ pr_err("st%d: out of memory. Device not attached.\n", dev_num);
+ error = -ENOMEM;
+ goto out;
+ }
+ cdev->owner = THIS_MODULE;
+ cdev->ops = &st_fops;
+
+ error = cdev_add(cdev, cdev_devno, 1);
+ if (error) {
+ pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
+ rew ? "non" : "auto", mode);
+ pr_err("st%d: Device not attached.\n", dev_num);
+ goto out_free;
+ }
+ STm->cdevs[rew] = cdev;
+
+ i = mode << (4 - ST_NBR_MODE_BITS);
+ snprintf(name, 10, "%s%s%s", rew ? "n" : "",
+ tape->disk->disk_name, st_formats[i]);
+
+ dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
+ cdev_devno, &tape->modes[mode], "%s", name);
+ if (IS_ERR(dev)) {
+ pr_err("st%d: device_create failed\n", dev_num);
+ error = PTR_ERR(dev);
+ goto out_free;
+ }
+
+ STm->devs[rew] = dev;
+
+ return 0;
+out_free:
+ cdev_del(STm->cdevs[rew]);
+ STm->cdevs[rew] = NULL;
+out:
+ return error;
+}
+
+static int create_cdevs(struct scsi_tape *tape)
+{
+ int mode, error;
+ for (mode = 0; mode < ST_NBR_MODES; ++mode) {
+ error = create_one_cdev(tape, mode, 0);
+ if (error)
+ return error;
+ error = create_one_cdev(tape, mode, 1);
+ if (error)
+ return error;
+ }
+
+ return sysfs_create_link(&tape->device->sdev_gendev.kobj,
+ &tape->modes[0].devs[0]->kobj, "tape");
+}
+
+static void remove_cdevs(struct scsi_tape *tape)
+{
+ int mode, rew;
+ sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
+ for (mode = 0; mode < ST_NBR_MODES; mode++) {
+ struct st_modedef *STm = &(tape->modes[mode]);
+ for (rew = 0; rew < 2; rew++) {
+ if (STm->cdevs[rew])
+ cdev_del(STm->cdevs[rew]);
+ if (STm->devs[rew])
+ device_unregister(STm->devs[rew]);
+ }
+ }
+}
+
static int st_probe(struct device *dev)
{
struct scsi_device *SDp = to_scsi_device(dev);
struct gendisk *disk = NULL;
- struct cdev *cdev = NULL;
struct scsi_tape *tpnt = NULL;
struct st_modedef *STm;
struct st_partstat *STps;
struct st_buffer *buffer;
- int i, j, mode, dev_num, error;
+ int i, error;
char *stp;
if (SDp->type != TYPE_TAPE)
@@ -3895,11 +4091,10 @@ static int st_probe(struct device *dev)
return -ENODEV;
}
- i = min(SDp->request_queue->max_hw_segments,
- SDp->request_queue->max_phys_segments);
+ i = queue_max_segments(SDp->request_queue);
if (st_max_sg_segs < i)
i = st_max_sg_segs;
- buffer = new_tape_buffer(1, (SDp->host)->unchecked_isa_dma, i);
+ buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
if (buffer == NULL) {
printk(KERN_ERR
"st: Can't allocate new tape buffer. Device not attached.\n");
@@ -3912,58 +4107,20 @@ static int st_probe(struct device *dev)
goto out_buffer_free;
}
- write_lock(&st_dev_arr_lock);
- if (st_nr_dev >= st_dev_max) {
- struct scsi_tape **tmp_da;
- int tmp_dev_max;
-
- tmp_dev_max = max(st_nr_dev * 2, 8);
- if (tmp_dev_max > ST_MAX_TAPES)
- tmp_dev_max = ST_MAX_TAPES;
- if (tmp_dev_max <= st_nr_dev) {
- write_unlock(&st_dev_arr_lock);
- printk(KERN_ERR "st: Too many tape devices (max. %d).\n",
- ST_MAX_TAPES);
- goto out_put_disk;
- }
-
- tmp_da = kzalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC);
- if (tmp_da == NULL) {
- write_unlock(&st_dev_arr_lock);
- printk(KERN_ERR "st: Can't extend device array.\n");
- goto out_put_disk;
- }
-
- if (scsi_tapes != NULL) {
- memcpy(tmp_da, scsi_tapes,
- st_dev_max * sizeof(struct scsi_tape *));
- kfree(scsi_tapes);
- }
- scsi_tapes = tmp_da;
-
- st_dev_max = tmp_dev_max;
- }
-
- for (i = 0; i < st_dev_max; i++)
- if (scsi_tapes[i] == NULL)
- break;
- if (i >= st_dev_max)
- panic("scsi_devices corrupt (st)");
-
tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
if (tpnt == NULL) {
- write_unlock(&st_dev_arr_lock);
printk(KERN_ERR "st: Can't allocate device descriptor.\n");
goto out_put_disk;
}
kref_init(&tpnt->kref);
tpnt->disk = disk;
- sprintf(disk->disk_name, "st%d", i);
disk->private_data = &tpnt->driver;
disk->queue = SDp->request_queue;
+ /* SCSI tape doesn't register this gendisk via add_disk(). Manually
+ * take queue reference that release_disk() expects. */
+ if (!blk_get_queue(disk->queue))
+ goto out_put_disk;
tpnt->driver = &st_template;
- scsi_tapes[i] = tpnt;
- dev_num = i;
tpnt->device = SDp;
if (SDp->scsi_level <= 2)
@@ -3987,12 +4144,14 @@ static int st_probe(struct device *dev)
tpnt->two_fm = ST_TWO_FM;
tpnt->fast_mteom = ST_FAST_MTEOM;
tpnt->scsi2_logical = ST_SCSI2LOGICAL;
+ tpnt->sili = ST_SILI;
tpnt->immediate = ST_NOWAIT;
+ tpnt->immediate_filemark = 0;
tpnt->default_drvbuffer = 0xff; /* No forced buffering */
tpnt->partition = 0;
tpnt->new_partition = 0;
tpnt->nbr_partitions = 0;
- tpnt->device->timeout = ST_TIMEOUT;
+ blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT);
tpnt->long_timeout = ST_LONG_TIMEOUT;
tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
@@ -4007,6 +4166,7 @@ static int st_probe(struct device *dev)
STm->default_compression = ST_DONT_TOUCH;
STm->default_blksize = (-1); /* No forced size */
STm->default_density = (-1); /* No forced density */
+ STm->tape = tpnt;
}
for (i = 0; i < ST_NBR_PARTITIONS; i++) {
@@ -4026,38 +4186,25 @@ static int st_probe(struct device *dev)
tpnt->blksize_changed = 0;
mutex_init(&tpnt->lock);
- st_nr_dev++;
- write_unlock(&st_dev_arr_lock);
+ idr_preload(GFP_KERNEL);
+ spin_lock(&st_index_lock);
+ error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
+ spin_unlock(&st_index_lock);
+ idr_preload_end();
+ if (error < 0) {
+ pr_warn("st: idr allocation failed: %d\n", error);
+ goto out_put_queue;
+ }
+ tpnt->index = error;
+ sprintf(disk->disk_name, "st%d", tpnt->index);
- for (mode = 0; mode < ST_NBR_MODES; ++mode) {
- STm = &(tpnt->modes[mode]);
- for (j=0; j < 2; j++) {
- cdev = cdev_alloc();
- if (!cdev) {
- printk(KERN_ERR
- "st%d: out of memory. Device not attached.\n",
- dev_num);
- goto out_free_tape;
- }
- cdev->owner = THIS_MODULE;
- cdev->ops = &st_fops;
-
- error = cdev_add(cdev,
- MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)),
- 1);
- if (error) {
- printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n",
- dev_num, j ? "non" : "auto", mode);
- printk(KERN_ERR "st%d: Device not attached.\n", dev_num);
- goto out_free_tape;
- }
- STm->cdevs[j] = cdev;
+ dev_set_drvdata(dev, tpnt);
- }
- error = do_create_class_files(tpnt, dev_num, mode);
- if (error)
- goto out_free_tape;
- }
+
+ error = create_cdevs(tpnt);
+ if (error)
+ goto out_remove_devs;
+ scsi_autopm_put_device(SDp);
sdev_printk(KERN_NOTICE, SDp,
"Attached scsi tape %s\n", tape_name(tpnt));
@@ -4067,28 +4214,13 @@ static int st_probe(struct device *dev)
return 0;
-out_free_tape:
- for (mode=0; mode < ST_NBR_MODES; mode++) {
- STm = &(tpnt->modes[mode]);
- sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
- "tape");
- for (j=0; j < 2; j++) {
- if (STm->cdevs[j]) {
- if (cdev == STm->cdevs[j])
- cdev = NULL;
- class_device_destroy(st_sysfs_class,
- MKDEV(SCSI_TAPE_MAJOR,
- TAPE_MINOR(i, mode, j)));
- cdev_del(STm->cdevs[j]);
- }
- }
- }
- if (cdev)
- cdev_del(cdev);
- write_lock(&st_dev_arr_lock);
- scsi_tapes[dev_num] = NULL;
- st_nr_dev--;
- write_unlock(&st_dev_arr_lock);
+out_remove_devs:
+ remove_cdevs(tpnt);
+ spin_lock(&st_index_lock);
+ idr_remove(&st_index_idr, tpnt->index);
+ spin_unlock(&st_index_lock);
+out_put_queue:
+ blk_put_queue(disk->queue);
out_put_disk:
put_disk(disk);
kfree(tpnt);
@@ -4101,37 +4233,18 @@ out:
static int st_remove(struct device *dev)
{
- struct scsi_device *SDp = to_scsi_device(dev);
- struct scsi_tape *tpnt;
- int i, j, mode;
-
- write_lock(&st_dev_arr_lock);
- for (i = 0; i < st_dev_max; i++) {
- tpnt = scsi_tapes[i];
- if (tpnt != NULL && tpnt->device == SDp) {
- scsi_tapes[i] = NULL;
- st_nr_dev--;
- write_unlock(&st_dev_arr_lock);
- sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
- "tape");
- for (mode = 0; mode < ST_NBR_MODES; ++mode) {
- for (j=0; j < 2; j++) {
- class_device_destroy(st_sysfs_class,
- MKDEV(SCSI_TAPE_MAJOR,
- TAPE_MINOR(i, mode, j)));
- cdev_del(tpnt->modes[mode].cdevs[j]);
- tpnt->modes[mode].cdevs[j] = NULL;
- }
- }
+ struct scsi_tape *tpnt = dev_get_drvdata(dev);
+ int index = tpnt->index;
- mutex_lock(&st_ref_mutex);
- kref_put(&tpnt->kref, scsi_tape_release);
- mutex_unlock(&st_ref_mutex);
- return 0;
- }
- }
+ scsi_autopm_get_device(to_scsi_device(dev));
+ remove_cdevs(tpnt);
- write_unlock(&st_dev_arr_lock);
+ mutex_lock(&st_ref_mutex);
+ kref_put(&tpnt->kref, scsi_tape_release);
+ mutex_unlock(&st_ref_mutex);
+ spin_lock(&st_index_lock);
+ idr_remove(&st_index_idr, index);
+ spin_unlock(&st_index_lock);
return 0;
}
@@ -4152,8 +4265,8 @@ static void scsi_tape_release(struct kref *kref)
tpnt->device = NULL;
if (tpnt->buffer) {
- tpnt->buffer->orig_frp_segs = 0;
normalize_buffer(tpnt->buffer);
+ kfree(tpnt->buffer->reserved_pages);
kfree(tpnt->buffer);
}
@@ -4163,6 +4276,11 @@ static void scsi_tape_release(struct kref *kref)
return;
}
+static struct class st_sysfs_class = {
+ .name = "scsi_tape",
+ .dev_groups = st_dev_groups,
+};
+
static int __init init_st(void)
{
int err;
@@ -4172,10 +4290,10 @@ static int __init init_st(void)
printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
verstr, st_fixed_buffer_size, st_max_sg_segs);
- st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
- if (IS_ERR(st_sysfs_class)) {
- printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
- return PTR_ERR(st_sysfs_class);
+ err = class_register(&st_sysfs_class);
+ if (err) {
+ pr_err("Unable register sysfs class for SCSI tapes\n");
+ return err;
}
err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
@@ -4202,7 +4320,7 @@ err_chrdev:
unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
ST_MAX_TAPE_ENTRIES);
err_class:
- class_destroy(st_sysfs_class);
+ class_unregister(&st_sysfs_class);
return err;
}
@@ -4212,8 +4330,7 @@ static void __exit exit_st(void)
scsi_unregister_driver(&st_template.gendrv);
unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
ST_MAX_TAPE_ENTRIES);
- class_destroy(st_sysfs_class);
- kfree(scsi_tapes);
+ class_unregister(&st_sysfs_class);
printk(KERN_INFO "st: Unloaded.\n");
}
@@ -4285,33 +4402,35 @@ static void do_remove_sysfs_files(void)
driver_remove_file(sysfs, &driver_attr_try_direct_io);
}
-
/* The sysfs simple class interface */
-static ssize_t st_defined_show(struct class_device *class_dev, char *buf)
+static ssize_t
+defined_show(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev);
+ struct st_modedef *STm = dev_get_drvdata(dev);
ssize_t l = 0;
l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined);
return l;
}
+static DEVICE_ATTR_RO(defined);
-CLASS_DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL);
-
-static ssize_t st_defblk_show(struct class_device *class_dev, char *buf)
+static ssize_t
+default_blksize_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
- struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev);
+ struct st_modedef *STm = dev_get_drvdata(dev);
ssize_t l = 0;
l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize);
return l;
}
+static DEVICE_ATTR_RO(default_blksize);
-CLASS_DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL);
-
-static ssize_t st_defdensity_show(struct class_device *class_dev, char *buf)
+static ssize_t
+default_density_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
- struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev);
+ struct st_modedef *STm = dev_get_drvdata(dev);
ssize_t l = 0;
char *fmt;
@@ -4319,86 +4438,70 @@ static ssize_t st_defdensity_show(struct class_device *class_dev, char *buf)
l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
return l;
}
+static DEVICE_ATTR_RO(default_density);
-CLASS_DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL);
-
-static ssize_t st_defcompression_show(struct class_device *class_dev, char *buf)
+static ssize_t
+default_compression_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
- struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev);
+ struct st_modedef *STm = dev_get_drvdata(dev);
ssize_t l = 0;
l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1);
return l;
}
+static DEVICE_ATTR_RO(default_compression);
-CLASS_DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
-
-static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
+static ssize_t
+options_show(struct device *dev, struct device_attribute *attr, char *buf)
{
- int i, rew, error;
- char name[10];
- struct class_device *st_class_member;
-
- for (rew=0; rew < 2; rew++) {
- /* Make sure that the minor numbers corresponding to the four
- first modes always get the same names */
- i = mode << (4 - ST_NBR_MODE_BITS);
- snprintf(name, 10, "%s%s%s", rew ? "n" : "",
- STp->disk->disk_name, st_formats[i]);
- st_class_member =
- class_device_create(st_sysfs_class, NULL,
- MKDEV(SCSI_TAPE_MAJOR,
- TAPE_MINOR(dev_num, mode, rew)),
- &STp->device->sdev_gendev, "%s", name);
- if (IS_ERR(st_class_member)) {
- printk(KERN_WARNING "st%d: class_device_create failed\n",
- dev_num);
- error = PTR_ERR(st_class_member);
- goto out;
- }
- class_set_devdata(st_class_member, &STp->modes[mode]);
-
- error = class_device_create_file(st_class_member,
- &class_device_attr_defined);
- if (error) goto out;
- error = class_device_create_file(st_class_member,
- &class_device_attr_default_blksize);
- if (error) goto out;
- error = class_device_create_file(st_class_member,
- &class_device_attr_default_density);
- if (error) goto out;
- error = class_device_create_file(st_class_member,
- &class_device_attr_default_compression);
- if (error) goto out;
-
- if (mode == 0 && rew == 0) {
- error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
- &st_class_member->kobj,
- "tape");
- if (error) {
- printk(KERN_ERR
- "st%d: Can't create sysfs link from SCSI device.\n",
- dev_num);
- goto out;
- }
- }
- }
-
- return 0;
+ struct st_modedef *STm = dev_get_drvdata(dev);
+ struct scsi_tape *STp = STm->tape;
+ int options;
+ ssize_t l = 0;
-out:
- return error;
+ options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
+ options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
+ options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
+ DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
+ options |= STp->two_fm ? MT_ST_TWO_FM : 0;
+ options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
+ options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
+ options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
+ options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
+ options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
+ options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
+ options |= STm->sysv ? MT_ST_SYSV : 0;
+ options |= STp->immediate ? MT_ST_NOWAIT : 0;
+ options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0;
+ options |= STp->sili ? MT_ST_SILI : 0;
+
+ l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
+ return l;
}
+static DEVICE_ATTR_RO(options);
+
+static struct attribute *st_dev_attrs[] = {
+ &dev_attr_defined.attr,
+ &dev_attr_default_blksize.attr,
+ &dev_attr_default_density.attr,
+ &dev_attr_default_compression.attr,
+ &dev_attr_options.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(st_dev);
/* The following functions may be useful for a larger audience. */
-static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
- unsigned long uaddr, size_t count, int rw)
+static int sgl_map_user_pages(struct st_buffer *STbp,
+ const unsigned int max_pages, unsigned long uaddr,
+ size_t count, int rw)
{
unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
unsigned long start = uaddr >> PAGE_SHIFT;
const int nr_pages = end - start;
int res, i, j;
struct page **pages;
+ struct rq_map_data *mdata = &STbp->map_data;
/* User attempted Overflow! */
if ((uaddr + count) < uaddr)
@@ -4440,24 +4543,10 @@ static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pa
flush_dcache_page(pages[i]);
}
- /* Populate the scatter/gather list */
- sg_set_page(&sgl[0], pages[0], 0, uaddr & ~PAGE_MASK);
- if (nr_pages > 1) {
- sgl[0].length = PAGE_SIZE - sgl[0].offset;
- count -= sgl[0].length;
- for (i=1; i < nr_pages ; i++) {
- sg_set_page(&sgl[i], pages[i],
- count < PAGE_SIZE ? count : PAGE_SIZE, 0);;
- count -= PAGE_SIZE;
- }
- }
- else {
- sgl[0].length = count;
- }
+ mdata->offset = uaddr & ~PAGE_MASK;
+ STbp->mapped_pages = pages;
- kfree(pages);
return nr_pages;
-
out_unmap:
if (res > 0) {
for (j=0; j < res; j++)
@@ -4470,13 +4559,13 @@ static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pa
/* And unmap them... */
-static int sgl_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
- int dirtied)
+static int sgl_unmap_user_pages(struct st_buffer *STbp,
+ const unsigned int nr_pages, int dirtied)
{
int i;
for (i=0; i < nr_pages; i++) {
- struct page *page = sg_page(&sgl[i]);
+ struct page *page = STbp->mapped_pages[i];
if (dirtied)
SetPageDirty(page);
@@ -4485,6 +4574,8 @@ static int sgl_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_p
*/
page_cache_release(page);
}
+ kfree(STbp->mapped_pages);
+ STbp->mapped_pages = NULL;
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 05:25:03 +0000