![Colin Ian King](/assets/img/avatar_default.png)
Pointer STbuffer is being assigned but is never used hence it is redundant and can be removed. Cleans up clang warning: warning: variable 'STbuffer' set but not used [-Wunused-but-set-variable] Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Kai Mäkisara <kai.makisara@kolumbus.fi> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
4970 lines
130 KiB
C
4970 lines
130 KiB
C
/*
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SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
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file Documentation/scsi/st.txt for more information.
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History:
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Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara.
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Contribution and ideas from several people including (in alphabetical
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order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk,
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Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky,
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Michael Schaefer, J"org Weule, and Eric Youngdale.
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Copyright 1992 - 2016 Kai Makisara
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email Kai.Makisara@kolumbus.fi
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Some small formal changes - aeb, 950809
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Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
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*/
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static const char *verstr = "20160209";
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/mtio.h>
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#include <linux/cdrom.h>
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#include <linux/ioctl.h>
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#include <linux/fcntl.h>
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#include <linux/spinlock.h>
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#include <linux/blkdev.h>
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#include <linux/moduleparam.h>
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#include <linux/cdev.h>
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#include <linux/idr.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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#include <asm/dma.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/sg.h>
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/* The driver prints some debugging information on the console if DEBUG
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is defined and non-zero. */
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#define DEBUG 1
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#define NO_DEBUG 0
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#define ST_DEB_MSG KERN_NOTICE
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#if DEBUG
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/* The message level for the debug messages is currently set to KERN_NOTICE
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so that people can easily see the messages. Later when the debugging messages
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in the drivers are more widely classified, this may be changed to KERN_DEBUG. */
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#define DEB(a) a
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#define DEBC(a) if (debugging) { a ; }
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#else
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#define DEB(a)
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#define DEBC(a)
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#endif
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#define ST_KILOBYTE 1024
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#include "st_options.h"
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#include "st.h"
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static int buffer_kbs;
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static int max_sg_segs;
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static int try_direct_io = TRY_DIRECT_IO;
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static int try_rdio = 1;
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static int try_wdio = 1;
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static int debug_flag;
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static struct class st_sysfs_class;
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static const struct attribute_group *st_dev_groups[];
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static const struct attribute_group *st_drv_groups[];
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MODULE_AUTHOR("Kai Makisara");
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MODULE_DESCRIPTION("SCSI tape (st) driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
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/* Set 'perm' (4th argument) to 0 to disable module_param's definition
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* of sysfs parameters (which module_param doesn't yet support).
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* Sysfs parameters defined explicitly later.
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*/
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module_param_named(buffer_kbs, buffer_kbs, int, 0);
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MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)");
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module_param_named(max_sg_segs, max_sg_segs, int, 0);
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MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)");
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module_param_named(try_direct_io, try_direct_io, int, 0);
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MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)");
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module_param_named(debug_flag, debug_flag, int, 0);
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MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1");
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/* Extra parameters for testing */
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module_param_named(try_rdio, try_rdio, int, 0);
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MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible");
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module_param_named(try_wdio, try_wdio, int, 0);
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MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible");
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#ifndef MODULE
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static int write_threshold_kbs; /* retained for compatibility */
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static struct st_dev_parm {
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char *name;
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int *val;
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} parms[] __initdata = {
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{
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"buffer_kbs", &buffer_kbs
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},
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{ /* Retained for compatibility with 2.4 */
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"write_threshold_kbs", &write_threshold_kbs
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},
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{
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"max_sg_segs", NULL
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},
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{
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"try_direct_io", &try_direct_io
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},
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{
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"debug_flag", &debug_flag
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}
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};
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#endif
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/* Restrict the number of modes so that names for all are assigned */
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#if ST_NBR_MODES > 16
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#error "Maximum number of modes is 16"
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#endif
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/* Bit reversed order to get same names for same minors with all
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mode counts */
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static const char *st_formats[] = {
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"", "r", "k", "s", "l", "t", "o", "u",
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"m", "v", "p", "x", "a", "y", "q", "z"};
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/* The default definitions have been moved to st_options.h */
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#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE)
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/* The buffer size should fit into the 24 bits for length in the
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6-byte SCSI read and write commands. */
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#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1)
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#error "Buffer size should not exceed (2 << 24 - 1) bytes!"
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#endif
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static int debugging = DEBUG;
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#define MAX_RETRIES 0
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#define MAX_WRITE_RETRIES 0
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#define MAX_READY_RETRIES 0
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#define NO_TAPE NOT_READY
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#define ST_TIMEOUT (900 * HZ)
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#define ST_LONG_TIMEOUT (14000 * HZ)
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/* Remove mode bits and auto-rewind bit (7) */
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#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \
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(iminor(x) & ~(-1 << ST_MODE_SHIFT)) )
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#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
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/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */
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#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \
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(d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) )
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/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
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24 bits) */
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#define SET_DENS_AND_BLK 0x10001
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static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE;
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static int st_max_sg_segs = ST_MAX_SG;
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static int modes_defined;
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static int enlarge_buffer(struct st_buffer *, int, int);
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static void clear_buffer(struct st_buffer *);
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static void normalize_buffer(struct st_buffer *);
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static int append_to_buffer(const char __user *, struct st_buffer *, int);
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static int from_buffer(struct st_buffer *, char __user *, int);
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static void move_buffer_data(struct st_buffer *, int);
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static int sgl_map_user_pages(struct st_buffer *, const unsigned int,
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unsigned long, size_t, int);
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static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int);
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static int st_probe(struct device *);
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static int st_remove(struct device *);
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static struct scsi_driver st_template = {
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.gendrv = {
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.name = "st",
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.owner = THIS_MODULE,
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.probe = st_probe,
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.remove = st_remove,
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.groups = st_drv_groups,
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},
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};
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static int st_compression(struct scsi_tape *, int);
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static int find_partition(struct scsi_tape *);
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static int switch_partition(struct scsi_tape *);
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static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long);
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static void scsi_tape_release(struct kref *);
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#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref)
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static DEFINE_MUTEX(st_ref_mutex);
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static DEFINE_SPINLOCK(st_index_lock);
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static DEFINE_SPINLOCK(st_use_lock);
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static DEFINE_IDR(st_index_idr);
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#include "osst_detect.h"
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#ifndef SIGS_FROM_OSST
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#define SIGS_FROM_OSST \
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{"OnStream", "SC-", "", "osst"}, \
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{"OnStream", "DI-", "", "osst"}, \
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{"OnStream", "DP-", "", "osst"}, \
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{"OnStream", "USB", "", "osst"}, \
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{"OnStream", "FW-", "", "osst"}
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#endif
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static struct scsi_tape *scsi_tape_get(int dev)
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{
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struct scsi_tape *STp = NULL;
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mutex_lock(&st_ref_mutex);
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spin_lock(&st_index_lock);
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STp = idr_find(&st_index_idr, dev);
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if (!STp) goto out;
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kref_get(&STp->kref);
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if (!STp->device)
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goto out_put;
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if (scsi_device_get(STp->device))
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goto out_put;
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goto out;
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out_put:
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kref_put(&STp->kref, scsi_tape_release);
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STp = NULL;
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out:
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spin_unlock(&st_index_lock);
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mutex_unlock(&st_ref_mutex);
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return STp;
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}
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static void scsi_tape_put(struct scsi_tape *STp)
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{
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struct scsi_device *sdev = STp->device;
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mutex_lock(&st_ref_mutex);
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kref_put(&STp->kref, scsi_tape_release);
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scsi_device_put(sdev);
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mutex_unlock(&st_ref_mutex);
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}
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struct st_reject_data {
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char *vendor;
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char *model;
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char *rev;
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char *driver_hint; /* Name of the correct driver, NULL if unknown */
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};
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static struct st_reject_data reject_list[] = {
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/* {"XXX", "Yy-", "", NULL}, example */
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SIGS_FROM_OSST,
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{NULL, }};
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/* If the device signature is on the list of incompatible drives, the
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function returns a pointer to the name of the correct driver (if known) */
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static char * st_incompatible(struct scsi_device* SDp)
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{
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struct st_reject_data *rp;
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for (rp=&(reject_list[0]); rp->vendor != NULL; rp++)
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if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) &&
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!strncmp(rp->model, SDp->model, strlen(rp->model)) &&
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!strncmp(rp->rev, SDp->rev, strlen(rp->rev))) {
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if (rp->driver_hint)
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return rp->driver_hint;
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else
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return "unknown";
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}
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return NULL;
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}
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static inline char *tape_name(struct scsi_tape *tape)
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{
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return tape->disk->disk_name;
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}
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#define st_printk(prefix, t, fmt, a...) \
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sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a)
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#ifdef DEBUG
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#define DEBC_printk(t, fmt, a...) \
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if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); }
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#else
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#define DEBC_printk(t, fmt, a...)
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#endif
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static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
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{
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const u8 *ucp;
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const u8 *sense = SRpnt->sense;
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s->have_sense = scsi_normalize_sense(SRpnt->sense,
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SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
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s->flags = 0;
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if (s->have_sense) {
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s->deferred = 0;
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s->remainder_valid =
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scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64);
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switch (sense[0] & 0x7f) {
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case 0x71:
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s->deferred = 1;
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case 0x70:
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s->fixed_format = 1;
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s->flags = sense[2] & 0xe0;
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break;
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case 0x73:
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s->deferred = 1;
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case 0x72:
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s->fixed_format = 0;
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ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4);
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s->flags = ucp ? (ucp[3] & 0xe0) : 0;
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break;
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}
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}
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}
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/* Convert the result to success code */
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static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
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{
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int result = SRpnt->result;
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u8 scode;
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DEB(const char *stp;)
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char *name = tape_name(STp);
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struct st_cmdstatus *cmdstatp;
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if (!result)
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return 0;
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cmdstatp = &STp->buffer->cmdstat;
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st_analyze_sense(SRpnt, cmdstatp);
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if (cmdstatp->have_sense)
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scode = STp->buffer->cmdstat.sense_hdr.sense_key;
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else
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scode = 0;
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DEB(
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if (debugging) {
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st_printk(ST_DEB_MSG, STp,
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"Error: %x, cmd: %x %x %x %x %x %x\n", result,
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SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
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SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
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if (cmdstatp->have_sense)
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__scsi_print_sense(STp->device, name,
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SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
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} ) /* end DEB */
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if (!debugging) { /* Abnormal conditions for tape */
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if (!cmdstatp->have_sense)
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st_printk(KERN_WARNING, STp,
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"Error %x (driver bt 0x%x, host bt 0x%x).\n",
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result, driver_byte(result), host_byte(result));
|
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else if (cmdstatp->have_sense &&
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scode != NO_SENSE &&
|
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scode != RECOVERED_ERROR &&
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/* scode != UNIT_ATTENTION && */
|
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scode != BLANK_CHECK &&
|
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scode != VOLUME_OVERFLOW &&
|
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SRpnt->cmd[0] != MODE_SENSE &&
|
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SRpnt->cmd[0] != TEST_UNIT_READY) {
|
||
|
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__scsi_print_sense(STp->device, name,
|
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SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
|
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}
|
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}
|
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|
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if (cmdstatp->fixed_format &&
|
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STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
|
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if (STp->cln_sense_value)
|
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STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
|
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STp->cln_sense_mask) == STp->cln_sense_value);
|
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else
|
||
STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
|
||
STp->cln_sense_mask) != 0);
|
||
}
|
||
if (cmdstatp->have_sense &&
|
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cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17)
|
||
STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */
|
||
|
||
STp->pos_unknown |= STp->device->was_reset;
|
||
|
||
if (cmdstatp->have_sense &&
|
||
scode == RECOVERED_ERROR
|
||
#if ST_RECOVERED_WRITE_FATAL
|
||
&& SRpnt->cmd[0] != WRITE_6
|
||
&& SRpnt->cmd[0] != WRITE_FILEMARKS
|
||
#endif
|
||
) {
|
||
STp->recover_count++;
|
||
STp->recover_reg++;
|
||
|
||
DEB(
|
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if (debugging) {
|
||
if (SRpnt->cmd[0] == READ_6)
|
||
stp = "read";
|
||
else if (SRpnt->cmd[0] == WRITE_6)
|
||
stp = "write";
|
||
else
|
||
stp = "ioctl";
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"Recovered %s error (%d).\n",
|
||
stp, STp->recover_count);
|
||
} ) /* end DEB */
|
||
|
||
if (cmdstatp->flags == 0)
|
||
return 0;
|
||
}
|
||
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 {
|
||
st_printk(KERN_ERR, stp,
|
||
"Can't get SCSI request.\n");
|
||
if (signal_pending(current))
|
||
stp->buffer->syscall_result = -EINTR;
|
||
else
|
||
stp->buffer->syscall_result = -EBUSY;
|
||
}
|
||
|
||
return streq;
|
||
}
|
||
|
||
static void st_release_request(struct st_request *streq)
|
||
{
|
||
kfree(streq);
|
||
}
|
||
|
||
static void st_do_stats(struct scsi_tape *STp, struct request *req)
|
||
{
|
||
ktime_t now;
|
||
|
||
now = ktime_get();
|
||
if (scsi_req(req)->cmd[0] == WRITE_6) {
|
||
now = ktime_sub(now, STp->stats->write_time);
|
||
atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time);
|
||
atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
|
||
atomic64_inc(&STp->stats->write_cnt);
|
||
if (scsi_req(req)->result) {
|
||
atomic64_add(atomic_read(&STp->stats->last_write_size)
|
||
- STp->buffer->cmdstat.residual,
|
||
&STp->stats->write_byte_cnt);
|
||
if (STp->buffer->cmdstat.residual > 0)
|
||
atomic64_inc(&STp->stats->resid_cnt);
|
||
} else
|
||
atomic64_add(atomic_read(&STp->stats->last_write_size),
|
||
&STp->stats->write_byte_cnt);
|
||
} else if (scsi_req(req)->cmd[0] == READ_6) {
|
||
now = ktime_sub(now, STp->stats->read_time);
|
||
atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time);
|
||
atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
|
||
atomic64_inc(&STp->stats->read_cnt);
|
||
if (scsi_req(req)->result) {
|
||
atomic64_add(atomic_read(&STp->stats->last_read_size)
|
||
- STp->buffer->cmdstat.residual,
|
||
&STp->stats->read_byte_cnt);
|
||
if (STp->buffer->cmdstat.residual > 0)
|
||
atomic64_inc(&STp->stats->resid_cnt);
|
||
} else
|
||
atomic64_add(atomic_read(&STp->stats->last_read_size),
|
||
&STp->stats->read_byte_cnt);
|
||
} else {
|
||
now = ktime_sub(now, STp->stats->other_time);
|
||
atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time);
|
||
atomic64_inc(&STp->stats->other_cnt);
|
||
}
|
||
atomic64_dec(&STp->stats->in_flight);
|
||
}
|
||
|
||
static void st_scsi_execute_end(struct request *req, blk_status_t status)
|
||
{
|
||
struct st_request *SRpnt = req->end_io_data;
|
||
struct scsi_request *rq = scsi_req(req);
|
||
struct scsi_tape *STp = SRpnt->stp;
|
||
struct bio *tmp;
|
||
|
||
STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result;
|
||
STp->buffer->cmdstat.residual = rq->resid_len;
|
||
|
||
st_do_stats(STp, req);
|
||
|
||
tmp = SRpnt->bio;
|
||
if (rq->sense_len)
|
||
memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE);
|
||
if (SRpnt->waiting)
|
||
complete(SRpnt->waiting);
|
||
|
||
blk_rq_unmap_user(tmp);
|
||
__blk_put_request(req->q, req);
|
||
}
|
||
|
||
static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
|
||
int data_direction, void *buffer, unsigned bufflen,
|
||
int timeout, int retries)
|
||
{
|
||
struct request *req;
|
||
struct scsi_request *rq;
|
||
struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
|
||
int err = 0;
|
||
struct scsi_tape *STp = SRpnt->stp;
|
||
|
||
req = blk_get_request(SRpnt->stp->device->request_queue,
|
||
data_direction == DMA_TO_DEVICE ?
|
||
REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
|
||
if (IS_ERR(req))
|
||
return DRIVER_ERROR << 24;
|
||
rq = scsi_req(req);
|
||
req->rq_flags |= RQF_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;
|
||
}
|
||
}
|
||
|
||
atomic64_inc(&STp->stats->in_flight);
|
||
if (cmd[0] == WRITE_6) {
|
||
atomic_set(&STp->stats->last_write_size, bufflen);
|
||
STp->stats->write_time = ktime_get();
|
||
} else if (cmd[0] == READ_6) {
|
||
atomic_set(&STp->stats->last_read_size, bufflen);
|
||
STp->stats->read_time = ktime_get();
|
||
} else {
|
||
STp->stats->other_time = ktime_get();
|
||
}
|
||
|
||
SRpnt->bio = req->bio;
|
||
rq->cmd_len = COMMAND_SIZE(cmd[0]);
|
||
memset(rq->cmd, 0, BLK_MAX_CDB);
|
||
memcpy(rq->cmd, cmd, rq->cmd_len);
|
||
req->timeout = timeout;
|
||
rq->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.
|
||
Otherwise write_behind_check() is used to check that the command
|
||
has finished. */
|
||
static struct st_request *
|
||
st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
|
||
int bytes, int direction, int timeout, int retries, int do_wait)
|
||
{
|
||
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)) {
|
||
st_printk(KERN_ERR, STp,
|
||
"Async command already active.\n");
|
||
if (signal_pending(current))
|
||
(STp->buffer)->syscall_result = (-EINTR);
|
||
else
|
||
(STp->buffer)->syscall_result = (-EBUSY);
|
||
return NULL;
|
||
}
|
||
|
||
if (!SRpnt) {
|
||
SRpnt = st_allocate_request(STp);
|
||
if (!SRpnt)
|
||
return NULL;
|
||
}
|
||
|
||
/* If async IO, set last_SRpnt. This ptr tells write_behind_check
|
||
which IO is outstanding. It's nulled out when the IO completes. */
|
||
if (!do_wait)
|
||
(STp->buffer)->last_SRpnt = SRpnt;
|
||
|
||
waiting = &STp->wait;
|
||
init_completion(waiting);
|
||
SRpnt->waiting = waiting;
|
||
|
||
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;
|
||
|
||
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) {
|
||
wait_for_completion(waiting);
|
||
SRpnt->waiting = NULL;
|
||
(STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
|
||
}
|
||
|
||
return SRpnt;
|
||
}
|
||
|
||
|
||
/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
|
||
write has been correct but EOM early warning reached, -EIO if write ended in
|
||
error or zero if write successful. Asynchronous writes are used only in
|
||
variable block mode. */
|
||
static int write_behind_check(struct scsi_tape * STp)
|
||
{
|
||
int retval = 0;
|
||
struct st_buffer *STbuffer;
|
||
struct st_partstat *STps;
|
||
struct st_cmdstatus *cmdstatp;
|
||
struct st_request *SRpnt;
|
||
|
||
STbuffer = STp->buffer;
|
||
if (!STbuffer->writing)
|
||
return 0;
|
||
|
||
DEB(
|
||
if (STp->write_pending)
|
||
STp->nbr_waits++;
|
||
else
|
||
STp->nbr_finished++;
|
||
) /* end DEB */
|
||
|
||
wait_for_completion(&(STp->wait));
|
||
SRpnt = STbuffer->last_SRpnt;
|
||
STbuffer->last_SRpnt = NULL;
|
||
SRpnt->waiting = NULL;
|
||
|
||
(STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
|
||
st_release_request(SRpnt);
|
||
|
||
STbuffer->buffer_bytes -= STbuffer->writing;
|
||
STps = &(STp->ps[STp->partition]);
|
||
if (STps->drv_block >= 0) {
|
||
if (STp->block_size == 0)
|
||
STps->drv_block++;
|
||
else
|
||
STps->drv_block += STbuffer->writing / STp->block_size;
|
||
}
|
||
|
||
cmdstatp = &STbuffer->cmdstat;
|
||
if (STbuffer->syscall_result) {
|
||
retval = -EIO;
|
||
if (cmdstatp->have_sense && !cmdstatp->deferred &&
|
||
(cmdstatp->flags & SENSE_EOM) &&
|
||
(cmdstatp->sense_hdr.sense_key == NO_SENSE ||
|
||
cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) {
|
||
/* EOM at write-behind, has all data been written? */
|
||
if (!cmdstatp->remainder_valid ||
|
||
cmdstatp->uremainder64 == 0)
|
||
retval = -ENOSPC;
|
||
}
|
||
if (retval == -EIO)
|
||
STps->drv_block = -1;
|
||
}
|
||
STbuffer->writing = 0;
|
||
|
||
DEB(if (debugging && retval)
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"Async write error %x, return value %d.\n",
|
||
STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */
|
||
|
||
return retval;
|
||
}
|
||
|
||
|
||
/* Step over EOF if it has been inadvertently crossed (ioctl not used because
|
||
it messes up the block number). */
|
||
static int cross_eof(struct scsi_tape * STp, int forward)
|
||
{
|
||
struct st_request *SRpnt;
|
||
unsigned char cmd[MAX_COMMAND_SIZE];
|
||
|
||
cmd[0] = SPACE;
|
||
cmd[1] = 0x01; /* Space FileMarks */
|
||
if (forward) {
|
||
cmd[2] = cmd[3] = 0;
|
||
cmd[4] = 1;
|
||
} else
|
||
cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */
|
||
cmd[5] = 0;
|
||
|
||
DEBC_printk(STp, "Stepping over filemark %s.\n",
|
||
forward ? "forward" : "backward");
|
||
|
||
SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
|
||
STp->device->request_queue->rq_timeout,
|
||
MAX_RETRIES, 1);
|
||
if (!SRpnt)
|
||
return (STp->buffer)->syscall_result;
|
||
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
|
||
if ((STp->buffer)->cmdstat.midlevel_result != 0)
|
||
st_printk(KERN_ERR, STp,
|
||
"Stepping over filemark %s failed.\n",
|
||
forward ? "forward" : "backward");
|
||
|
||
return (STp->buffer)->syscall_result;
|
||
}
|
||
|
||
|
||
/* Flush the write buffer (never need to write if variable blocksize). */
|
||
static int st_flush_write_buffer(struct scsi_tape * STp)
|
||
{
|
||
int transfer, blks;
|
||
int result;
|
||
unsigned char cmd[MAX_COMMAND_SIZE];
|
||
struct st_request *SRpnt;
|
||
struct st_partstat *STps;
|
||
|
||
result = write_behind_check(STp);
|
||
if (result)
|
||
return result;
|
||
|
||
result = 0;
|
||
if (STp->dirty == 1) {
|
||
|
||
transfer = STp->buffer->buffer_bytes;
|
||
DEBC_printk(STp, "Flushing %d bytes.\n", transfer);
|
||
|
||
memset(cmd, 0, MAX_COMMAND_SIZE);
|
||
cmd[0] = WRITE_6;
|
||
cmd[1] = 1;
|
||
blks = transfer / STp->block_size;
|
||
cmd[2] = blks >> 16;
|
||
cmd[3] = blks >> 8;
|
||
cmd[4] = blks;
|
||
|
||
SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE,
|
||
STp->device->request_queue->rq_timeout,
|
||
MAX_WRITE_RETRIES, 1);
|
||
if (!SRpnt)
|
||
return (STp->buffer)->syscall_result;
|
||
|
||
STps = &(STp->ps[STp->partition]);
|
||
if ((STp->buffer)->syscall_result != 0) {
|
||
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
|
||
|
||
if (cmdstatp->have_sense && !cmdstatp->deferred &&
|
||
(cmdstatp->flags & SENSE_EOM) &&
|
||
(cmdstatp->sense_hdr.sense_key == NO_SENSE ||
|
||
cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
|
||
(!cmdstatp->remainder_valid ||
|
||
cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */
|
||
STp->dirty = 0;
|
||
(STp->buffer)->buffer_bytes = 0;
|
||
if (STps->drv_block >= 0)
|
||
STps->drv_block += blks;
|
||
result = (-ENOSPC);
|
||
} else {
|
||
st_printk(KERN_ERR, STp, "Error on flush.\n");
|
||
STps->drv_block = (-1);
|
||
result = (-EIO);
|
||
}
|
||
} else {
|
||
if (STps->drv_block >= 0)
|
||
STps->drv_block += blks;
|
||
STp->dirty = 0;
|
||
(STp->buffer)->buffer_bytes = 0;
|
||
}
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
/* Flush the tape buffer. The tape will be positioned correctly unless
|
||
seek_next is true. */
|
||
static int flush_buffer(struct scsi_tape *STp, int seek_next)
|
||
{
|
||
int backspace, result;
|
||
struct st_partstat *STps;
|
||
|
||
/*
|
||
* If there was a bus reset, block further access
|
||
* to this device.
|
||
*/
|
||
if (STp->pos_unknown)
|
||
return (-EIO);
|
||
|
||
if (STp->ready != ST_READY)
|
||
return 0;
|
||
STps = &(STp->ps[STp->partition]);
|
||
if (STps->rw == ST_WRITING) /* Writing */
|
||
return st_flush_write_buffer(STp);
|
||
|
||
if (STp->block_size == 0)
|
||
return 0;
|
||
|
||
backspace = ((STp->buffer)->buffer_bytes +
|
||
(STp->buffer)->read_pointer) / STp->block_size -
|
||
((STp->buffer)->read_pointer + STp->block_size - 1) /
|
||
STp->block_size;
|
||
(STp->buffer)->buffer_bytes = 0;
|
||
(STp->buffer)->read_pointer = 0;
|
||
result = 0;
|
||
if (!seek_next) {
|
||
if (STps->eof == ST_FM_HIT) {
|
||
result = cross_eof(STp, 0); /* Back over the EOF hit */
|
||
if (!result)
|
||
STps->eof = ST_NOEOF;
|
||
else {
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file++;
|
||
STps->drv_block = 0;
|
||
}
|
||
}
|
||
if (!result && backspace > 0)
|
||
result = st_int_ioctl(STp, MTBSR, backspace);
|
||
} else if (STps->eof == ST_FM_HIT) {
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file++;
|
||
STps->drv_block = 0;
|
||
STps->eof = ST_NOEOF;
|
||
}
|
||
return result;
|
||
|
||
}
|
||
|
||
/* Set the mode parameters */
|
||
static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm)
|
||
{
|
||
int set_it = 0;
|
||
unsigned long arg;
|
||
|
||
if (!STp->density_changed &&
|
||
STm->default_density >= 0 &&
|
||
STm->default_density != STp->density) {
|
||
arg = STm->default_density;
|
||
set_it = 1;
|
||
} else
|
||
arg = STp->density;
|
||
arg <<= MT_ST_DENSITY_SHIFT;
|
||
if (!STp->blksize_changed &&
|
||
STm->default_blksize >= 0 &&
|
||
STm->default_blksize != STp->block_size) {
|
||
arg |= STm->default_blksize;
|
||
set_it = 1;
|
||
} else
|
||
arg |= STp->block_size;
|
||
if (set_it &&
|
||
st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) {
|
||
st_printk(KERN_WARNING, STp,
|
||
"Can't set default block size to %d bytes "
|
||
"and density %x.\n",
|
||
STm->default_blksize, STm->default_density);
|
||
if (modes_defined)
|
||
return (-EINVAL);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Lock or unlock the drive door. Don't use when st_request allocated. */
|
||
static int do_door_lock(struct scsi_tape * STp, int do_lock)
|
||
{
|
||
int retval;
|
||
|
||
DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl");
|
||
|
||
retval = scsi_set_medium_removal(STp->device,
|
||
do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
|
||
if (!retval)
|
||
STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED;
|
||
else
|
||
STp->door_locked = ST_LOCK_FAILS;
|
||
return retval;
|
||
}
|
||
|
||
|
||
/* Set the internal state after reset */
|
||
static void reset_state(struct scsi_tape *STp)
|
||
{
|
||
int i;
|
||
struct st_partstat *STps;
|
||
|
||
STp->pos_unknown = 0;
|
||
for (i = 0; i < ST_NBR_PARTITIONS; i++) {
|
||
STps = &(STp->ps[i]);
|
||
STps->rw = ST_IDLE;
|
||
STps->eof = ST_NOEOF;
|
||
STps->at_sm = 0;
|
||
STps->last_block_valid = 0;
|
||
STps->drv_block = -1;
|
||
STps->drv_file = -1;
|
||
}
|
||
if (STp->can_partitions) {
|
||
STp->partition = find_partition(STp);
|
||
if (STp->partition < 0)
|
||
STp->partition = 0;
|
||
STp->new_partition = STp->partition;
|
||
}
|
||
}
|
||
|
||
/* Test if the drive is ready. Returns either one of the codes below or a negative system
|
||
error code. */
|
||
#define CHKRES_READY 0
|
||
#define CHKRES_NEW_SESSION 1
|
||
#define CHKRES_NOT_READY 2
|
||
#define CHKRES_NO_TAPE 3
|
||
|
||
#define MAX_ATTENTIONS 10
|
||
|
||
static int test_ready(struct scsi_tape *STp, int do_wait)
|
||
{
|
||
int attentions, waits, max_wait, scode;
|
||
int retval = CHKRES_READY, new_session = 0;
|
||
unsigned char cmd[MAX_COMMAND_SIZE];
|
||
struct st_request *SRpnt = NULL;
|
||
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
|
||
|
||
max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
|
||
|
||
for (attentions=waits=0; ; ) {
|
||
memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
|
||
cmd[0] = TEST_UNIT_READY;
|
||
SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
|
||
STp->long_timeout, MAX_READY_RETRIES, 1);
|
||
|
||
if (!SRpnt) {
|
||
retval = (STp->buffer)->syscall_result;
|
||
break;
|
||
}
|
||
|
||
if (cmdstatp->have_sense) {
|
||
|
||
scode = cmdstatp->sense_hdr.sense_key;
|
||
|
||
if (scode == UNIT_ATTENTION) { /* New media? */
|
||
new_session = 1;
|
||
if (attentions < MAX_ATTENTIONS) {
|
||
attentions++;
|
||
continue;
|
||
}
|
||
else {
|
||
retval = (-EIO);
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (scode == NOT_READY) {
|
||
if (waits < max_wait) {
|
||
if (msleep_interruptible(1000)) {
|
||
retval = (-EINTR);
|
||
break;
|
||
}
|
||
waits++;
|
||
continue;
|
||
}
|
||
else {
|
||
if ((STp->device)->scsi_level >= SCSI_2 &&
|
||
cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */
|
||
retval = CHKRES_NO_TAPE;
|
||
else
|
||
retval = CHKRES_NOT_READY;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
retval = (STp->buffer)->syscall_result;
|
||
if (!retval)
|
||
retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY;
|
||
break;
|
||
}
|
||
|
||
if (SRpnt != NULL)
|
||
st_release_request(SRpnt);
|
||
return retval;
|
||
}
|
||
|
||
|
||
/* See if the drive is ready and gather information about the tape. Return values:
|
||
< 0 negative error code from errno.h
|
||
0 drive ready
|
||
1 drive not ready (possibly no tape)
|
||
*/
|
||
static int check_tape(struct scsi_tape *STp, struct file *filp)
|
||
{
|
||
int i, retval, new_session = 0, do_wait;
|
||
unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
|
||
unsigned short st_flags = filp->f_flags;
|
||
struct st_request *SRpnt = NULL;
|
||
struct st_modedef *STm;
|
||
struct st_partstat *STps;
|
||
struct inode *inode = file_inode(filp);
|
||
int mode = TAPE_MODE(inode);
|
||
|
||
STp->ready = ST_READY;
|
||
|
||
if (mode != STp->current_mode) {
|
||
DEBC_printk(STp, "Mode change from %d to %d.\n",
|
||
STp->current_mode, mode);
|
||
new_session = 1;
|
||
STp->current_mode = mode;
|
||
}
|
||
STm = &(STp->modes[STp->current_mode]);
|
||
|
||
saved_cleaning = STp->cleaning_req;
|
||
STp->cleaning_req = 0;
|
||
|
||
do_wait = ((filp->f_flags & O_NONBLOCK) == 0);
|
||
retval = test_ready(STp, do_wait);
|
||
|
||
if (retval < 0)
|
||
goto err_out;
|
||
|
||
if (retval == CHKRES_NEW_SESSION) {
|
||
STp->pos_unknown = 0;
|
||
STp->partition = STp->new_partition = 0;
|
||
if (STp->can_partitions)
|
||
STp->nbr_partitions = 1; /* This guess will be updated later
|
||
if necessary */
|
||
for (i = 0; i < ST_NBR_PARTITIONS; i++) {
|
||
STps = &(STp->ps[i]);
|
||
STps->rw = ST_IDLE;
|
||
STps->eof = ST_NOEOF;
|
||
STps->at_sm = 0;
|
||
STps->last_block_valid = 0;
|
||
STps->drv_block = 0;
|
||
STps->drv_file = 0;
|
||
}
|
||
new_session = 1;
|
||
}
|
||
else {
|
||
STp->cleaning_req |= saved_cleaning;
|
||
|
||
if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) {
|
||
if (retval == CHKRES_NO_TAPE)
|
||
STp->ready = ST_NO_TAPE;
|
||
else
|
||
STp->ready = ST_NOT_READY;
|
||
|
||
STp->density = 0; /* Clear the erroneous "residue" */
|
||
STp->write_prot = 0;
|
||
STp->block_size = 0;
|
||
STp->ps[0].drv_file = STp->ps[0].drv_block = (-1);
|
||
STp->partition = STp->new_partition = 0;
|
||
STp->door_locked = ST_UNLOCKED;
|
||
return CHKRES_NOT_READY;
|
||
}
|
||
}
|
||
|
||
if (STp->omit_blklims)
|
||
STp->min_block = STp->max_block = (-1);
|
||
else {
|
||
memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
|
||
cmd[0] = READ_BLOCK_LIMITS;
|
||
|
||
SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
|
||
STp->device->request_queue->rq_timeout,
|
||
MAX_READY_RETRIES, 1);
|
||
if (!SRpnt) {
|
||
retval = (STp->buffer)->syscall_result;
|
||
goto err_out;
|
||
}
|
||
|
||
if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
|
||
STp->max_block = ((STp->buffer)->b_data[1] << 16) |
|
||
((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
|
||
STp->min_block = ((STp->buffer)->b_data[4] << 8) |
|
||
(STp->buffer)->b_data[5];
|
||
if ( DEB( debugging || ) !STp->inited)
|
||
st_printk(KERN_INFO, STp,
|
||
"Block limits %d - %d bytes.\n",
|
||
STp->min_block, STp->max_block);
|
||
} else {
|
||
STp->min_block = STp->max_block = (-1);
|
||
DEBC_printk(STp, "Can't read block limits.\n");
|
||
}
|
||
}
|
||
|
||
memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
|
||
cmd[0] = MODE_SENSE;
|
||
cmd[4] = 12;
|
||
|
||
SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
|
||
STp->device->request_queue->rq_timeout,
|
||
MAX_READY_RETRIES, 1);
|
||
if (!SRpnt) {
|
||
retval = (STp->buffer)->syscall_result;
|
||
goto err_out;
|
||
}
|
||
|
||
if ((STp->buffer)->syscall_result != 0) {
|
||
DEBC_printk(STp, "No Mode Sense.\n");
|
||
STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */
|
||
(STp->buffer)->syscall_result = 0; /* Prevent error propagation */
|
||
STp->drv_write_prot = 0;
|
||
} else {
|
||
DEBC_printk(STp,"Mode sense. Length %d, "
|
||
"medium %x, WBS %x, BLL %d\n",
|
||
(STp->buffer)->b_data[0],
|
||
(STp->buffer)->b_data[1],
|
||
(STp->buffer)->b_data[2],
|
||
(STp->buffer)->b_data[3]);
|
||
|
||
if ((STp->buffer)->b_data[3] >= 8) {
|
||
STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7;
|
||
STp->density = (STp->buffer)->b_data[4];
|
||
STp->block_size = (STp->buffer)->b_data[9] * 65536 +
|
||
(STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11];
|
||
DEBC_printk(STp, "Density %x, tape length: %x, "
|
||
"drv buffer: %d\n",
|
||
STp->density,
|
||
(STp->buffer)->b_data[5] * 65536 +
|
||
(STp->buffer)->b_data[6] * 256 +
|
||
(STp->buffer)->b_data[7],
|
||
STp->drv_buffer);
|
||
}
|
||
STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
|
||
if (!STp->drv_buffer && STp->immediate_filemark) {
|
||
st_printk(KERN_WARNING, STp,
|
||
"non-buffered tape: disabling "
|
||
"writing immediate filemarks\n");
|
||
STp->immediate_filemark = 0;
|
||
}
|
||
}
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
STp->inited = 1;
|
||
|
||
if (STp->block_size > 0)
|
||
(STp->buffer)->buffer_blocks =
|
||
(STp->buffer)->buffer_size / STp->block_size;
|
||
else
|
||
(STp->buffer)->buffer_blocks = 1;
|
||
(STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
|
||
|
||
DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n",
|
||
STp->block_size, (STp->buffer)->buffer_size,
|
||
(STp->buffer)->buffer_blocks);
|
||
|
||
if (STp->drv_write_prot) {
|
||
STp->write_prot = 1;
|
||
|
||
DEBC_printk(STp, "Write protected\n");
|
||
|
||
if (do_wait &&
|
||
((st_flags & O_ACCMODE) == O_WRONLY ||
|
||
(st_flags & O_ACCMODE) == O_RDWR)) {
|
||
retval = (-EROFS);
|
||
goto err_out;
|
||
}
|
||
}
|
||
|
||
if (STp->can_partitions && STp->nbr_partitions < 1) {
|
||
/* This code is reached when the device is opened for the first time
|
||
after the driver has been initialized with tape in the drive and the
|
||
partition support has been enabled. */
|
||
DEBC_printk(STp, "Updating partition number in status.\n");
|
||
if ((STp->partition = find_partition(STp)) < 0) {
|
||
retval = STp->partition;
|
||
goto err_out;
|
||
}
|
||
STp->new_partition = STp->partition;
|
||
STp->nbr_partitions = 1; /* This guess will be updated when necessary */
|
||
}
|
||
|
||
if (new_session) { /* Change the drive parameters for the new mode */
|
||
STp->density_changed = STp->blksize_changed = 0;
|
||
STp->compression_changed = 0;
|
||
if (!(STm->defaults_for_writes) &&
|
||
(retval = set_mode_densblk(STp, STm)) < 0)
|
||
goto err_out;
|
||
|
||
if (STp->default_drvbuffer != 0xff) {
|
||
if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer))
|
||
st_printk(KERN_WARNING, STp,
|
||
"Can't set default drive "
|
||
"buffering to %d.\n",
|
||
STp->default_drvbuffer);
|
||
}
|
||
}
|
||
|
||
return CHKRES_READY;
|
||
|
||
err_out:
|
||
return retval;
|
||
}
|
||
|
||
|
||
/* 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);
|
||
|
||
/*
|
||
* We really want to do nonseekable_open(inode, filp); here, but some
|
||
* versions of tar incorrectly call lseek on tapes and bail out if that
|
||
* fails. So we disallow pread() and pwrite(), but permit lseeks.
|
||
*/
|
||
filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
|
||
|
||
if (!(STp = scsi_tape_get(dev))) {
|
||
return -ENXIO;
|
||
}
|
||
|
||
filp->private_data = STp;
|
||
|
||
spin_lock(&st_use_lock);
|
||
if (STp->in_use) {
|
||
spin_unlock(&st_use_lock);
|
||
scsi_tape_put(STp);
|
||
DEBC_printk(STp, "Device already in use.\n");
|
||
return (-EBUSY);
|
||
}
|
||
|
||
STp->in_use = 1;
|
||
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;
|
||
}
|
||
|
||
/* See that we have at least a one page buffer available */
|
||
if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) {
|
||
st_printk(KERN_WARNING, STp,
|
||
"Can't allocate one page tape buffer.\n");
|
||
retval = (-EOVERFLOW);
|
||
goto err_out;
|
||
}
|
||
|
||
(STp->buffer)->cleared = 0;
|
||
(STp->buffer)->writing = 0;
|
||
(STp->buffer)->syscall_result = 0;
|
||
|
||
STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY);
|
||
|
||
STp->dirty = 0;
|
||
for (i = 0; i < ST_NBR_PARTITIONS; i++) {
|
||
STps = &(STp->ps[i]);
|
||
STps->rw = ST_IDLE;
|
||
}
|
||
STp->try_dio_now = STp->try_dio;
|
||
STp->recover_count = 0;
|
||
DEB( STp->nbr_waits = STp->nbr_finished = 0;
|
||
STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; )
|
||
|
||
retval = check_tape(STp, filp);
|
||
if (retval < 0)
|
||
goto err_out;
|
||
if ((filp->f_flags & O_NONBLOCK) == 0 &&
|
||
retval != CHKRES_READY) {
|
||
if (STp->ready == NO_TAPE)
|
||
retval = (-ENOMEDIUM);
|
||
else
|
||
retval = (-EIO);
|
||
goto err_out;
|
||
}
|
||
return 0;
|
||
|
||
err_out:
|
||
normalize_buffer(STp->buffer);
|
||
spin_lock(&st_use_lock);
|
||
STp->in_use = 0;
|
||
spin_unlock(&st_use_lock);
|
||
if (resumed)
|
||
scsi_autopm_put_device(STp->device);
|
||
scsi_tape_put(STp);
|
||
return retval;
|
||
|
||
}
|
||
|
||
|
||
/* Flush the tape buffer before close */
|
||
static int st_flush(struct file *filp, fl_owner_t id)
|
||
{
|
||
int result = 0, result2;
|
||
unsigned char cmd[MAX_COMMAND_SIZE];
|
||
struct st_request *SRpnt;
|
||
struct scsi_tape *STp = filp->private_data;
|
||
struct st_modedef *STm = &(STp->modes[STp->current_mode]);
|
||
struct st_partstat *STps = &(STp->ps[STp->partition]);
|
||
|
||
if (file_count(filp) > 1)
|
||
return 0;
|
||
|
||
if (STps->rw == ST_WRITING && !STp->pos_unknown) {
|
||
result = st_flush_write_buffer(STp);
|
||
if (result != 0 && result != (-ENOSPC))
|
||
goto out;
|
||
}
|
||
|
||
if (STp->can_partitions &&
|
||
(result2 = switch_partition(STp)) < 0) {
|
||
DEBC_printk(STp, "switch_partition at close failed.\n");
|
||
if (result == 0)
|
||
result = result2;
|
||
goto out;
|
||
}
|
||
|
||
DEBC( if (STp->nbr_requests)
|
||
st_printk(KERN_DEBUG, STp,
|
||
"Number of r/w requests %d, dio used in %d, "
|
||
"pages %d.\n", STp->nbr_requests, STp->nbr_dio,
|
||
STp->nbr_pages));
|
||
|
||
if (STps->rw == ST_WRITING && !STp->pos_unknown) {
|
||
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
|
||
|
||
#if DEBUG
|
||
DEBC_printk(STp, "Async write waits %d, finished %d.\n",
|
||
STp->nbr_waits, STp->nbr_finished);
|
||
#endif
|
||
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->request_queue->rq_timeout,
|
||
MAX_WRITE_RETRIES, 1);
|
||
if (!SRpnt) {
|
||
result = (STp->buffer)->syscall_result;
|
||
goto out;
|
||
}
|
||
|
||
if (STp->buffer->syscall_result == 0 ||
|
||
(cmdstatp->have_sense && !cmdstatp->deferred &&
|
||
(cmdstatp->flags & SENSE_EOM) &&
|
||
(cmdstatp->sense_hdr.sense_key == NO_SENSE ||
|
||
cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
|
||
(!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
|
||
/* Write successful at EOM */
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file++;
|
||
STps->drv_block = 0;
|
||
if (STp->two_fm)
|
||
cross_eof(STp, 0);
|
||
STps->eof = ST_FM;
|
||
}
|
||
else { /* Write error */
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
st_printk(KERN_ERR, STp,
|
||
"Error on write filemark.\n");
|
||
if (result == 0)
|
||
result = (-EIO);
|
||
}
|
||
|
||
DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]);
|
||
} else if (!STp->rew_at_close) {
|
||
STps = &(STp->ps[STp->partition]);
|
||
if (!STm->sysv || STps->rw != ST_READING) {
|
||
if (STp->can_bsr)
|
||
result = flush_buffer(STp, 0);
|
||
else if (STps->eof == ST_FM_HIT) {
|
||
result = cross_eof(STp, 0);
|
||
if (result) {
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file++;
|
||
STps->drv_block = 0;
|
||
STps->eof = ST_FM;
|
||
} else
|
||
STps->eof = ST_NOEOF;
|
||
}
|
||
} else if ((STps->eof == ST_NOEOF &&
|
||
!(result = cross_eof(STp, 1))) ||
|
||
STps->eof == ST_FM_HIT) {
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file++;
|
||
STps->drv_block = 0;
|
||
STps->eof = ST_FM;
|
||
}
|
||
}
|
||
|
||
out:
|
||
if (STp->rew_at_close) {
|
||
result2 = st_int_ioctl(STp, MTREW, 1);
|
||
if (result == 0)
|
||
result = result2;
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
/* Close the device and release it. BKL is not needed: this is the only thread
|
||
accessing this tape. */
|
||
static int st_release(struct inode *inode, struct file *filp)
|
||
{
|
||
int result = 0;
|
||
struct scsi_tape *STp = filp->private_data;
|
||
|
||
if (STp->door_locked == ST_LOCKED_AUTO)
|
||
do_door_lock(STp, 0);
|
||
|
||
normalize_buffer(STp->buffer);
|
||
spin_lock(&st_use_lock);
|
||
STp->in_use = 0;
|
||
spin_unlock(&st_use_lock);
|
||
scsi_autopm_put_device(STp->device);
|
||
scsi_tape_put(STp);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* The checks common to both reading and writing */
|
||
static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count)
|
||
{
|
||
ssize_t retval = 0;
|
||
|
||
/*
|
||
* If we are in the middle of error recovery, don't let anyone
|
||
* else try and use this device. Also, if error recovery fails, it
|
||
* may try and take the device offline, in which case all further
|
||
* access to the device is prohibited.
|
||
*/
|
||
if (!scsi_block_when_processing_errors(STp->device)) {
|
||
retval = (-ENXIO);
|
||
goto out;
|
||
}
|
||
|
||
if (STp->ready != ST_READY) {
|
||
if (STp->ready == ST_NO_TAPE)
|
||
retval = (-ENOMEDIUM);
|
||
else
|
||
retval = (-EIO);
|
||
goto out;
|
||
}
|
||
|
||
if (! STp->modes[STp->current_mode].defined) {
|
||
retval = (-ENXIO);
|
||
goto out;
|
||
}
|
||
|
||
|
||
/*
|
||
* If there was a bus reset, block further access
|
||
* to this device.
|
||
*/
|
||
if (STp->pos_unknown) {
|
||
retval = (-EIO);
|
||
goto out;
|
||
}
|
||
|
||
if (count == 0)
|
||
goto out;
|
||
|
||
DEB(
|
||
if (!STp->in_use) {
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"Incorrect device.\n");
|
||
retval = (-EIO);
|
||
goto out;
|
||
} ) /* end DEB */
|
||
|
||
if (STp->can_partitions &&
|
||
(retval = switch_partition(STp)) < 0)
|
||
goto out;
|
||
|
||
if (STp->block_size == 0 && STp->max_block > 0 &&
|
||
(count < STp->min_block || count > STp->max_block)) {
|
||
retval = (-EINVAL);
|
||
goto out;
|
||
}
|
||
|
||
if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
|
||
!do_door_lock(STp, 1))
|
||
STp->door_locked = ST_LOCKED_AUTO;
|
||
|
||
out:
|
||
return retval;
|
||
}
|
||
|
||
|
||
static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
|
||
size_t count, int is_read)
|
||
{
|
||
int i, bufsize, retval = 0;
|
||
struct st_buffer *STbp = STp->buffer;
|
||
|
||
if (is_read)
|
||
i = STp->try_dio_now && try_rdio;
|
||
else
|
||
i = STp->try_dio_now && try_wdio;
|
||
|
||
if (i && ((unsigned long)buf & queue_dma_alignment(
|
||
STp->device->request_queue)) == 0) {
|
||
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 */
|
||
}
|
||
else
|
||
STbp->do_dio = 0; /* fall back to buffering with any error */
|
||
STbp->sg_segs = STbp->do_dio;
|
||
DEB(
|
||
if (STbp->do_dio) {
|
||
STp->nbr_dio++;
|
||
STp->nbr_pages += STbp->do_dio;
|
||
}
|
||
)
|
||
} else
|
||
STbp->do_dio = 0;
|
||
DEB( STp->nbr_requests++; )
|
||
|
||
if (!STbp->do_dio) {
|
||
if (STp->block_size)
|
||
bufsize = STp->block_size > st_fixed_buffer_size ?
|
||
STp->block_size : st_fixed_buffer_size;
|
||
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)) {
|
||
st_printk(KERN_WARNING, STp,
|
||
"Can't allocate %d byte tape buffer.\n",
|
||
bufsize);
|
||
retval = (-EOVERFLOW);
|
||
goto out;
|
||
}
|
||
if (STp->block_size)
|
||
STbp->buffer_blocks = bufsize / STp->block_size;
|
||
}
|
||
|
||
out:
|
||
return retval;
|
||
}
|
||
|
||
|
||
/* Can be called more than once after each setup_buffer() */
|
||
static void release_buffering(struct scsi_tape *STp, int is_read)
|
||
{
|
||
struct st_buffer *STbp;
|
||
|
||
STbp = STp->buffer;
|
||
if (STbp->do_dio) {
|
||
sgl_unmap_user_pages(STbp, STbp->do_dio, is_read);
|
||
STbp->do_dio = 0;
|
||
STbp->sg_segs = 0;
|
||
}
|
||
}
|
||
|
||
|
||
/* Write command */
|
||
static ssize_t
|
||
st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
|
||
{
|
||
ssize_t total;
|
||
ssize_t i, do_count, blks, transfer;
|
||
ssize_t retval;
|
||
int undone, retry_eot = 0, scode;
|
||
int async_write;
|
||
unsigned char cmd[MAX_COMMAND_SIZE];
|
||
const char __user *b_point;
|
||
struct st_request *SRpnt = NULL;
|
||
struct scsi_tape *STp = filp->private_data;
|
||
struct st_modedef *STm;
|
||
struct st_partstat *STps;
|
||
struct st_buffer *STbp;
|
||
|
||
if (mutex_lock_interruptible(&STp->lock))
|
||
return -ERESTARTSYS;
|
||
|
||
retval = rw_checks(STp, filp, count);
|
||
if (retval || count == 0)
|
||
goto out;
|
||
|
||
/* Write must be integral number of blocks */
|
||
if (STp->block_size != 0 && (count % STp->block_size) != 0) {
|
||
st_printk(KERN_WARNING, STp,
|
||
"Write not multiple of tape block size.\n");
|
||
retval = (-EINVAL);
|
||
goto out;
|
||
}
|
||
|
||
STm = &(STp->modes[STp->current_mode]);
|
||
STps = &(STp->ps[STp->partition]);
|
||
|
||
if (STp->write_prot) {
|
||
retval = (-EACCES);
|
||
goto out;
|
||
}
|
||
|
||
|
||
if (STps->rw == ST_READING) {
|
||
retval = flush_buffer(STp, 0);
|
||
if (retval)
|
||
goto out;
|
||
STps->rw = ST_WRITING;
|
||
} else if (STps->rw != ST_WRITING &&
|
||
STps->drv_file == 0 && STps->drv_block == 0) {
|
||
if ((retval = set_mode_densblk(STp, STm)) < 0)
|
||
goto out;
|
||
if (STm->default_compression != ST_DONT_TOUCH &&
|
||
!(STp->compression_changed)) {
|
||
if (st_compression(STp, (STm->default_compression == ST_YES))) {
|
||
st_printk(KERN_WARNING, STp,
|
||
"Can't set default compression.\n");
|
||
if (modes_defined) {
|
||
retval = (-EINVAL);
|
||
goto out;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
STbp = STp->buffer;
|
||
i = write_behind_check(STp);
|
||
if (i) {
|
||
if (i == -ENOSPC)
|
||
STps->eof = ST_EOM_OK;
|
||
else
|
||
STps->eof = ST_EOM_ERROR;
|
||
}
|
||
|
||
if (STps->eof == ST_EOM_OK) {
|
||
STps->eof = ST_EOD_1; /* allow next write */
|
||
retval = (-ENOSPC);
|
||
goto out;
|
||
}
|
||
else if (STps->eof == ST_EOM_ERROR) {
|
||
retval = (-EIO);
|
||
goto out;
|
||
}
|
||
|
||
/* Check the buffer readability in cases where copy_user might catch
|
||
the problems after some tape movement. */
|
||
if (STp->block_size != 0 &&
|
||
!STbp->do_dio &&
|
||
(copy_from_user(&i, buf, 1) != 0 ||
|
||
copy_from_user(&i, buf + count - 1, 1) != 0)) {
|
||
retval = (-EFAULT);
|
||
goto out;
|
||
}
|
||
|
||
retval = setup_buffering(STp, buf, count, 0);
|
||
if (retval)
|
||
goto out;
|
||
|
||
total = count;
|
||
|
||
memset(cmd, 0, MAX_COMMAND_SIZE);
|
||
cmd[0] = WRITE_6;
|
||
cmd[1] = (STp->block_size != 0);
|
||
|
||
STps->rw = ST_WRITING;
|
||
|
||
b_point = buf;
|
||
while (count > 0 && !retry_eot) {
|
||
|
||
if (STbp->do_dio) {
|
||
do_count = count;
|
||
}
|
||
else {
|
||
if (STp->block_size == 0)
|
||
do_count = count;
|
||
else {
|
||
do_count = STbp->buffer_blocks * STp->block_size -
|
||
STbp->buffer_bytes;
|
||
if (do_count > count)
|
||
do_count = count;
|
||
}
|
||
|
||
i = append_to_buffer(b_point, STbp, do_count);
|
||
if (i) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
}
|
||
count -= do_count;
|
||
b_point += do_count;
|
||
|
||
async_write = STp->block_size == 0 && !STbp->do_dio &&
|
||
STm->do_async_writes && STps->eof < ST_EOM_OK;
|
||
|
||
if (STp->block_size != 0 && STm->do_buffer_writes &&
|
||
!(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK &&
|
||
STbp->buffer_bytes < STbp->buffer_size) {
|
||
STp->dirty = 1;
|
||
/* Don't write a buffer that is not full enough. */
|
||
if (!async_write && count == 0)
|
||
break;
|
||
}
|
||
|
||
retry_write:
|
||
if (STp->block_size == 0)
|
||
blks = transfer = do_count;
|
||
else {
|
||
if (!STbp->do_dio)
|
||
blks = STbp->buffer_bytes;
|
||
else
|
||
blks = do_count;
|
||
blks /= STp->block_size;
|
||
transfer = blks * STp->block_size;
|
||
}
|
||
cmd[2] = blks >> 16;
|
||
cmd[3] = blks >> 8;
|
||
cmd[4] = blks;
|
||
|
||
SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE,
|
||
STp->device->request_queue->rq_timeout,
|
||
MAX_WRITE_RETRIES, !async_write);
|
||
if (!SRpnt) {
|
||
retval = STbp->syscall_result;
|
||
goto out;
|
||
}
|
||
if (async_write && !STbp->syscall_result) {
|
||
STbp->writing = transfer;
|
||
STp->dirty = !(STbp->writing ==
|
||
STbp->buffer_bytes);
|
||
SRpnt = NULL; /* Prevent releasing this request! */
|
||
DEB( STp->write_pending = 1; )
|
||
break;
|
||
}
|
||
|
||
if (STbp->syscall_result != 0) {
|
||
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
|
||
|
||
DEBC_printk(STp, "Error on write:\n");
|
||
if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) {
|
||
scode = cmdstatp->sense_hdr.sense_key;
|
||
if (cmdstatp->remainder_valid)
|
||
undone = (int)cmdstatp->uremainder64;
|
||
else if (STp->block_size == 0 &&
|
||
scode == VOLUME_OVERFLOW)
|
||
undone = transfer;
|
||
else
|
||
undone = 0;
|
||
if (STp->block_size != 0)
|
||
undone *= STp->block_size;
|
||
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;
|
||
STps->eof = ST_EOM_OK;
|
||
/* Continue in fixed block mode if all written
|
||
in this request but still something left to write
|
||
(retval left to zero)
|
||
*/
|
||
if (STp->block_size == 0 ||
|
||
undone > 0 || count == 0)
|
||
retval = (-ENOSPC); /* EOM within current request */
|
||
DEBC_printk(STp, "EOM with %d "
|
||
"bytes unwritten.\n",
|
||
(int)count);
|
||
} else {
|
||
/* EOT within data buffered earlier (possible only
|
||
in fixed block mode without direct i/o) */
|
||
if (!retry_eot && !cmdstatp->deferred &&
|
||
(scode == NO_SENSE || scode == RECOVERED_ERROR)) {
|
||
move_buffer_data(STp->buffer, transfer - undone);
|
||
retry_eot = 1;
|
||
if (STps->drv_block >= 0) {
|
||
STps->drv_block += (transfer - undone) /
|
||
STp->block_size;
|
||
}
|
||
STps->eof = ST_EOM_OK;
|
||
DEBC_printk(STp, "Retry "
|
||
"write of %d "
|
||
"bytes at EOM.\n",
|
||
STp->buffer->buffer_bytes);
|
||
goto retry_write;
|
||
}
|
||
else {
|
||
/* Either error within data buffered by driver or
|
||
failed retry */
|
||
count -= do_count;
|
||
blks = do_count = 0;
|
||
STps->eof = ST_EOM_ERROR;
|
||
STps->drv_block = (-1); /* Too cautious? */
|
||
retval = (-EIO); /* EOM for old data */
|
||
DEBC_printk(STp, "EOM with "
|
||
"lost data.\n");
|
||
}
|
||
}
|
||
} else {
|
||
count += do_count;
|
||
STps->drv_block = (-1); /* Too cautious? */
|
||
retval = STbp->syscall_result;
|
||
}
|
||
|
||
}
|
||
|
||
if (STps->drv_block >= 0) {
|
||
if (STp->block_size == 0)
|
||
STps->drv_block += (do_count > 0);
|
||
else
|
||
STps->drv_block += blks;
|
||
}
|
||
|
||
STbp->buffer_bytes = 0;
|
||
STp->dirty = 0;
|
||
|
||
if (retval || retry_eot) {
|
||
if (count < total)
|
||
retval = total - count;
|
||
goto out;
|
||
}
|
||
}
|
||
|
||
if (STps->eof == ST_EOD_1)
|
||
STps->eof = ST_EOM_OK;
|
||
else if (STps->eof != ST_EOM_OK)
|
||
STps->eof = ST_NOEOF;
|
||
retval = total - count;
|
||
|
||
out:
|
||
if (SRpnt != NULL)
|
||
st_release_request(SRpnt);
|
||
release_buffering(STp, 0);
|
||
mutex_unlock(&STp->lock);
|
||
|
||
return retval;
|
||
}
|
||
|
||
/* Read data from the tape. Returns zero in the normal case, one if the
|
||
eof status has changed, and the negative error code in case of a
|
||
fatal error. Otherwise updates the buffer and the eof state.
|
||
|
||
Does release user buffer mapping if it is set.
|
||
*/
|
||
static long read_tape(struct scsi_tape *STp, long count,
|
||
struct st_request ** aSRpnt)
|
||
{
|
||
int transfer, blks, bytes;
|
||
unsigned char cmd[MAX_COMMAND_SIZE];
|
||
struct st_request *SRpnt;
|
||
struct st_modedef *STm;
|
||
struct st_partstat *STps;
|
||
struct st_buffer *STbp;
|
||
int retval = 0;
|
||
|
||
if (count == 0)
|
||
return 0;
|
||
|
||
STm = &(STp->modes[STp->current_mode]);
|
||
STps = &(STp->ps[STp->partition]);
|
||
if (STps->eof == ST_FM_HIT)
|
||
return 1;
|
||
STbp = STp->buffer;
|
||
|
||
if (STp->block_size == 0)
|
||
blks = bytes = count;
|
||
else {
|
||
if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) {
|
||
blks = (STp->buffer)->buffer_blocks;
|
||
bytes = blks * STp->block_size;
|
||
} else {
|
||
bytes = count;
|
||
if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size)
|
||
bytes = (STp->buffer)->buffer_size;
|
||
blks = bytes / STp->block_size;
|
||
bytes = blks * STp->block_size;
|
||
}
|
||
}
|
||
|
||
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->request_queue->rq_timeout,
|
||
MAX_RETRIES, 1);
|
||
release_buffering(STp, 1);
|
||
*aSRpnt = SRpnt;
|
||
if (!SRpnt)
|
||
return STbp->syscall_result;
|
||
|
||
STbp->read_pointer = 0;
|
||
STps->at_sm = 0;
|
||
|
||
/* Something to check */
|
||
if (STbp->syscall_result) {
|
||
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
|
||
|
||
retval = 1;
|
||
DEBC_printk(STp,
|
||
"Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
|
||
SRpnt->sense[0], SRpnt->sense[1],
|
||
SRpnt->sense[2], SRpnt->sense[3],
|
||
SRpnt->sense[4], SRpnt->sense[5],
|
||
SRpnt->sense[6], SRpnt->sense[7]);
|
||
if (cmdstatp->have_sense) {
|
||
|
||
if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
|
||
cmdstatp->flags &= 0xcf; /* No need for EOM in this case */
|
||
|
||
if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */
|
||
/* Compute the residual count */
|
||
if (cmdstatp->remainder_valid)
|
||
transfer = (int)cmdstatp->uremainder64;
|
||
else
|
||
transfer = 0;
|
||
if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) {
|
||
if (STp->block_size == 0)
|
||
transfer = bytes;
|
||
/* Some drives set ILI with MEDIUM ERROR */
|
||
cmdstatp->flags &= ~SENSE_ILI;
|
||
}
|
||
|
||
if (cmdstatp->flags & SENSE_ILI) { /* ILI */
|
||
if (STp->block_size == 0 &&
|
||
transfer < 0) {
|
||
st_printk(KERN_NOTICE, STp,
|
||
"Failed to read %d "
|
||
"byte block with %d "
|
||
"byte transfer.\n",
|
||
bytes - transfer,
|
||
bytes);
|
||
if (STps->drv_block >= 0)
|
||
STps->drv_block += 1;
|
||
STbp->buffer_bytes = 0;
|
||
return (-ENOMEM);
|
||
} else if (STp->block_size == 0) {
|
||
STbp->buffer_bytes = bytes - transfer;
|
||
} else {
|
||
st_release_request(SRpnt);
|
||
SRpnt = *aSRpnt = NULL;
|
||
if (transfer == blks) { /* We did not get anything, error */
|
||
st_printk(KERN_NOTICE, STp,
|
||
"Incorrect "
|
||
"block size.\n");
|
||
if (STps->drv_block >= 0)
|
||
STps->drv_block += blks - transfer + 1;
|
||
st_int_ioctl(STp, MTBSR, 1);
|
||
return (-EIO);
|
||
}
|
||
/* We have some data, deliver it */
|
||
STbp->buffer_bytes = (blks - transfer) *
|
||
STp->block_size;
|
||
DEBC_printk(STp, "ILI but "
|
||
"enough data "
|
||
"received %ld "
|
||
"%d.\n", count,
|
||
STbp->buffer_bytes);
|
||
if (STps->drv_block >= 0)
|
||
STps->drv_block += 1;
|
||
if (st_int_ioctl(STp, MTBSR, 1))
|
||
return (-EIO);
|
||
}
|
||
} else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */
|
||
if (STps->eof != ST_FM_HIT)
|
||
STps->eof = ST_FM_HIT;
|
||
else
|
||
STps->eof = ST_EOD_2;
|
||
if (STp->block_size == 0)
|
||
STbp->buffer_bytes = 0;
|
||
else
|
||
STbp->buffer_bytes =
|
||
bytes - transfer * STp->block_size;
|
||
DEBC_printk(STp, "EOF detected (%d "
|
||
"bytes read).\n",
|
||
STbp->buffer_bytes);
|
||
} else if (cmdstatp->flags & SENSE_EOM) {
|
||
if (STps->eof == ST_FM)
|
||
STps->eof = ST_EOD_1;
|
||
else
|
||
STps->eof = ST_EOM_OK;
|
||
if (STp->block_size == 0)
|
||
STbp->buffer_bytes = bytes - transfer;
|
||
else
|
||
STbp->buffer_bytes =
|
||
bytes - transfer * STp->block_size;
|
||
|
||
DEBC_printk(STp, "EOM detected (%d "
|
||
"bytes read).\n",
|
||
STbp->buffer_bytes);
|
||
}
|
||
}
|
||
/* end of EOF, EOM, ILI test */
|
||
else { /* nonzero sense key */
|
||
DEBC_printk(STp, "Tape error while reading.\n");
|
||
STps->drv_block = (-1);
|
||
if (STps->eof == ST_FM &&
|
||
cmdstatp->sense_hdr.sense_key == BLANK_CHECK) {
|
||
DEBC_printk(STp, "Zero returned for "
|
||
"first BLANK CHECK "
|
||
"after EOF.\n");
|
||
STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */
|
||
} else /* Some other extended sense code */
|
||
retval = (-EIO);
|
||
}
|
||
|
||
if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */
|
||
STbp->buffer_bytes = 0;
|
||
}
|
||
/* End of extended sense test */
|
||
else { /* Non-extended sense */
|
||
retval = STbp->syscall_result;
|
||
}
|
||
|
||
}
|
||
/* End of error handling */
|
||
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)
|
||
STps->drv_block++;
|
||
else
|
||
STps->drv_block += STbp->buffer_bytes / STp->block_size;
|
||
}
|
||
return retval;
|
||
}
|
||
|
||
|
||
/* Read command */
|
||
static ssize_t
|
||
st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
|
||
{
|
||
ssize_t total;
|
||
ssize_t retval = 0;
|
||
ssize_t i, transfer;
|
||
int special, do_dio = 0;
|
||
struct st_request *SRpnt = NULL;
|
||
struct scsi_tape *STp = filp->private_data;
|
||
struct st_modedef *STm;
|
||
struct st_partstat *STps;
|
||
struct st_buffer *STbp = STp->buffer;
|
||
|
||
if (mutex_lock_interruptible(&STp->lock))
|
||
return -ERESTARTSYS;
|
||
|
||
retval = rw_checks(STp, filp, count);
|
||
if (retval || count == 0)
|
||
goto out;
|
||
|
||
STm = &(STp->modes[STp->current_mode]);
|
||
if (STp->block_size != 0 && (count % STp->block_size) != 0) {
|
||
if (!STm->do_read_ahead) {
|
||
retval = (-EINVAL); /* Read must be integral number of blocks */
|
||
goto out;
|
||
}
|
||
STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */
|
||
}
|
||
|
||
STps = &(STp->ps[STp->partition]);
|
||
if (STps->rw == ST_WRITING) {
|
||
retval = flush_buffer(STp, 0);
|
||
if (retval)
|
||
goto out;
|
||
STps->rw = ST_READING;
|
||
}
|
||
DEB(
|
||
if (debugging && STps->eof != ST_NOEOF)
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"EOF/EOM flag up (%d). Bytes %d\n",
|
||
STps->eof, STbp->buffer_bytes);
|
||
) /* end DEB */
|
||
|
||
retval = setup_buffering(STp, buf, count, 1);
|
||
if (retval)
|
||
goto out;
|
||
do_dio = STbp->do_dio;
|
||
|
||
if (STbp->buffer_bytes == 0 &&
|
||
STps->eof >= ST_EOD_1) {
|
||
if (STps->eof < ST_EOD) {
|
||
STps->eof += 1;
|
||
retval = 0;
|
||
goto out;
|
||
}
|
||
retval = (-EIO); /* EOM or Blank Check */
|
||
goto out;
|
||
}
|
||
|
||
if (do_dio) {
|
||
/* Check the buffer writability before any tape movement. Don't alter
|
||
buffer data. */
|
||
if (copy_from_user(&i, buf, 1) != 0 ||
|
||
copy_to_user(buf, &i, 1) != 0 ||
|
||
copy_from_user(&i, buf + count - 1, 1) != 0 ||
|
||
copy_to_user(buf + count - 1, &i, 1) != 0) {
|
||
retval = (-EFAULT);
|
||
goto out;
|
||
}
|
||
}
|
||
|
||
STps->rw = ST_READING;
|
||
|
||
|
||
/* Loop until enough data in buffer or a special condition found */
|
||
for (total = 0, special = 0; total < count && !special;) {
|
||
|
||
/* Get new data if the buffer is empty */
|
||
if (STbp->buffer_bytes == 0) {
|
||
special = read_tape(STp, count - total, &SRpnt);
|
||
if (special < 0) { /* No need to continue read */
|
||
retval = special;
|
||
goto out;
|
||
}
|
||
}
|
||
|
||
/* Move the data from driver buffer to user buffer */
|
||
if (STbp->buffer_bytes > 0) {
|
||
DEB(
|
||
if (debugging && STps->eof != ST_NOEOF)
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"EOF up (%d). Left %d, needed %d.\n",
|
||
STps->eof, STbp->buffer_bytes,
|
||
(int)(count - total));
|
||
) /* end DEB */
|
||
transfer = STbp->buffer_bytes < count - total ?
|
||
STbp->buffer_bytes : count - total;
|
||
if (!do_dio) {
|
||
i = from_buffer(STbp, buf, transfer);
|
||
if (i) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
}
|
||
buf += transfer;
|
||
total += transfer;
|
||
}
|
||
|
||
if (STp->block_size == 0)
|
||
break; /* Read only one variable length block */
|
||
|
||
} /* for (total = 0, special = 0;
|
||
total < count && !special; ) */
|
||
|
||
/* Change the eof state if no data from tape or buffer */
|
||
if (total == 0) {
|
||
if (STps->eof == ST_FM_HIT) {
|
||
STps->eof = ST_FM;
|
||
STps->drv_block = 0;
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file++;
|
||
} else if (STps->eof == ST_EOD_1) {
|
||
STps->eof = ST_EOD_2;
|
||
STps->drv_block = 0;
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file++;
|
||
} else if (STps->eof == ST_EOD_2)
|
||
STps->eof = ST_EOD;
|
||
} else if (STps->eof == ST_FM)
|
||
STps->eof = ST_NOEOF;
|
||
retval = total;
|
||
|
||
out:
|
||
if (SRpnt != NULL) {
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
}
|
||
if (do_dio) {
|
||
release_buffering(STp, 1);
|
||
STbp->buffer_bytes = 0;
|
||
}
|
||
mutex_unlock(&STp->lock);
|
||
|
||
return retval;
|
||
}
|
||
|
||
|
||
|
||
DEB(
|
||
/* Set the driver options */
|
||
static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm)
|
||
{
|
||
if (debugging) {
|
||
st_printk(KERN_INFO, STp,
|
||
"Mode %d options: buffer writes: %d, "
|
||
"async writes: %d, read ahead: %d\n",
|
||
STp->current_mode, STm->do_buffer_writes,
|
||
STm->do_async_writes, STm->do_read_ahead);
|
||
st_printk(KERN_INFO, STp,
|
||
" can bsr: %d, two FMs: %d, "
|
||
"fast mteom: %d, auto lock: %d,\n",
|
||
STp->can_bsr, STp->two_fm, STp->fast_mteom,
|
||
STp->do_auto_lock);
|
||
st_printk(KERN_INFO, STp,
|
||
" defs for wr: %d, no block limits: %d, "
|
||
"partitions: %d, s2 log: %d\n",
|
||
STm->defaults_for_writes, STp->omit_blklims,
|
||
STp->can_partitions, STp->scsi2_logical);
|
||
st_printk(KERN_INFO, STp,
|
||
" sysv: %d nowait: %d sili: %d "
|
||
"nowait_filemark: %d\n",
|
||
STm->sysv, STp->immediate, STp->sili,
|
||
STp->immediate_filemark);
|
||
st_printk(KERN_INFO, STp, " debugging: %d\n", debugging);
|
||
}
|
||
}
|
||
)
|
||
|
||
|
||
static int st_set_options(struct scsi_tape *STp, long options)
|
||
{
|
||
int value;
|
||
long code;
|
||
struct st_modedef *STm;
|
||
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];
|
||
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->devs[0] = d0;
|
||
STm->devs[1] = d1;
|
||
modes_defined = 1;
|
||
DEBC_printk(STp, "Initialized mode %d definition from mode 0\n",
|
||
STp->current_mode);
|
||
}
|
||
|
||
code = options & MT_ST_OPTIONS;
|
||
if (code == MT_ST_BOOLEANS) {
|
||
STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
|
||
STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
|
||
STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
|
||
STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
|
||
STp->two_fm = (options & MT_ST_TWO_FM) != 0;
|
||
STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
|
||
STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
|
||
STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
|
||
STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
|
||
if ((STp->device)->scsi_level >= SCSI_2)
|
||
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); )
|
||
} else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
|
||
value = (code == MT_ST_SETBOOLEANS);
|
||
if ((options & MT_ST_BUFFER_WRITES) != 0)
|
||
STm->do_buffer_writes = value;
|
||
if ((options & MT_ST_ASYNC_WRITES) != 0)
|
||
STm->do_async_writes = value;
|
||
if ((options & MT_ST_DEF_WRITES) != 0)
|
||
STm->defaults_for_writes = value;
|
||
if ((options & MT_ST_READ_AHEAD) != 0)
|
||
STm->do_read_ahead = value;
|
||
if ((options & MT_ST_TWO_FM) != 0)
|
||
STp->two_fm = value;
|
||
if ((options & MT_ST_FAST_MTEOM) != 0)
|
||
STp->fast_mteom = value;
|
||
if ((options & MT_ST_AUTO_LOCK) != 0)
|
||
STp->do_auto_lock = value;
|
||
if ((options & MT_ST_CAN_BSR) != 0)
|
||
STp->can_bsr = value;
|
||
if ((options & MT_ST_NO_BLKLIMS) != 0)
|
||
STp->omit_blklims = value;
|
||
if ((STp->device)->scsi_level >= SCSI_2 &&
|
||
(options & MT_ST_CAN_PARTITIONS) != 0)
|
||
STp->can_partitions = value;
|
||
if ((options & MT_ST_SCSI2LOGICAL) != 0)
|
||
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;
|
||
st_log_options(STp, STm); )
|
||
} else if (code == MT_ST_WRITE_THRESHOLD) {
|
||
/* Retained for compatibility */
|
||
} else if (code == MT_ST_DEF_BLKSIZE) {
|
||
value = (options & ~MT_ST_OPTIONS);
|
||
if (value == ~MT_ST_OPTIONS) {
|
||
STm->default_blksize = (-1);
|
||
DEBC_printk(STp, "Default block size disabled.\n");
|
||
} else {
|
||
STm->default_blksize = value;
|
||
DEBC_printk(STp,"Default block size set to "
|
||
"%d bytes.\n", STm->default_blksize);
|
||
if (STp->ready == ST_READY) {
|
||
STp->blksize_changed = 0;
|
||
set_mode_densblk(STp, STm);
|
||
}
|
||
}
|
||
} else if (code == MT_ST_TIMEOUTS) {
|
||
value = (options & ~MT_ST_OPTIONS);
|
||
if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
|
||
STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
|
||
DEBC_printk(STp, "Long timeout set to %d seconds.\n",
|
||
(value & ~MT_ST_SET_LONG_TIMEOUT));
|
||
} else {
|
||
blk_queue_rq_timeout(STp->device->request_queue,
|
||
value * HZ);
|
||
DEBC_printk(STp, "Normal timeout set to %d seconds.\n",
|
||
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))
|
||
return (-EINVAL);
|
||
STp->cln_mode = value;
|
||
STp->cln_sense_mask = (options >> 8) & 0xff;
|
||
STp->cln_sense_value = (options >> 16) & 0xff;
|
||
st_printk(KERN_INFO, STp,
|
||
"Cleaning request mode %d, mask %02x, value %02x\n",
|
||
value, STp->cln_sense_mask, STp->cln_sense_value);
|
||
} else if (code == MT_ST_DEF_OPTIONS) {
|
||
code = (options & ~MT_ST_CLEAR_DEFAULT);
|
||
value = (options & MT_ST_CLEAR_DEFAULT);
|
||
if (code == MT_ST_DEF_DENSITY) {
|
||
if (value == MT_ST_CLEAR_DEFAULT) {
|
||
STm->default_density = (-1);
|
||
DEBC_printk(STp,
|
||
"Density default disabled.\n");
|
||
} else {
|
||
STm->default_density = value & 0xff;
|
||
DEBC_printk(STp, "Density default set to %x\n",
|
||
STm->default_density);
|
||
if (STp->ready == ST_READY) {
|
||
STp->density_changed = 0;
|
||
set_mode_densblk(STp, STm);
|
||
}
|
||
}
|
||
} else if (code == MT_ST_DEF_DRVBUFFER) {
|
||
if (value == MT_ST_CLEAR_DEFAULT) {
|
||
STp->default_drvbuffer = 0xff;
|
||
DEBC_printk(STp,
|
||
"Drive buffer default disabled.\n");
|
||
} else {
|
||
STp->default_drvbuffer = value & 7;
|
||
DEBC_printk(STp,
|
||
"Drive buffer default set to %x\n",
|
||
STp->default_drvbuffer);
|
||
if (STp->ready == ST_READY)
|
||
st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer);
|
||
}
|
||
} else if (code == MT_ST_DEF_COMPRESSION) {
|
||
if (value == MT_ST_CLEAR_DEFAULT) {
|
||
STm->default_compression = ST_DONT_TOUCH;
|
||
DEBC_printk(STp,
|
||
"Compression default disabled.\n");
|
||
} else {
|
||
if ((value & 0xff00) != 0) {
|
||
STp->c_algo = (value & 0xff00) >> 8;
|
||
DEBC_printk(STp, "Compression "
|
||
"algorithm set to 0x%x.\n",
|
||
STp->c_algo);
|
||
}
|
||
if ((value & 0xff) != 0xff) {
|
||
STm->default_compression = (value & 1 ? ST_YES : ST_NO);
|
||
DEBC_printk(STp, "Compression default "
|
||
"set to %x\n",
|
||
(value & 1));
|
||
if (STp->ready == ST_READY) {
|
||
STp->compression_changed = 0;
|
||
st_compression(STp, (STm->default_compression == ST_YES));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
} else
|
||
return (-EIO);
|
||
|
||
return 0;
|
||
}
|
||
|
||
#define MODE_HEADER_LENGTH 4
|
||
|
||
/* Mode header and page byte offsets */
|
||
#define MH_OFF_DATA_LENGTH 0
|
||
#define MH_OFF_MEDIUM_TYPE 1
|
||
#define MH_OFF_DEV_SPECIFIC 2
|
||
#define MH_OFF_BDESCS_LENGTH 3
|
||
#define MP_OFF_PAGE_NBR 0
|
||
#define MP_OFF_PAGE_LENGTH 1
|
||
|
||
/* Mode header and page bit masks */
|
||
#define MH_BIT_WP 0x80
|
||
#define MP_MSK_PAGE_NBR 0x3f
|
||
|
||
/* Don't return block descriptors */
|
||
#define MODE_SENSE_OMIT_BDESCS 0x08
|
||
|
||
#define MODE_SELECT_PAGE_FORMAT 0x10
|
||
|
||
/* Read a mode page into the tape buffer. The block descriptors are included
|
||
if incl_block_descs is true. The page control is ored to the page number
|
||
parameter, if necessary. */
|
||
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;
|
||
|
||
memset(cmd, 0, MAX_COMMAND_SIZE);
|
||
cmd[0] = MODE_SENSE;
|
||
if (omit_block_descs)
|
||
cmd[1] = MODE_SENSE_OMIT_BDESCS;
|
||
cmd[2] = page;
|
||
cmd[4] = 255;
|
||
|
||
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;
|
||
}
|
||
|
||
|
||
/* Send the mode page in the tape buffer to the drive. Assumes that the mode data
|
||
in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
|
||
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;
|
||
int timeout;
|
||
|
||
memset(cmd, 0, MAX_COMMAND_SIZE);
|
||
cmd[0] = MODE_SELECT;
|
||
cmd[1] = MODE_SELECT_PAGE_FORMAT;
|
||
pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH];
|
||
cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2;
|
||
|
||
/* Clear reserved fields */
|
||
(STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0;
|
||
(STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0;
|
||
(STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
|
||
(STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
|
||
|
||
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;
|
||
}
|
||
|
||
|
||
#define COMPRESSION_PAGE 0x0f
|
||
#define COMPRESSION_PAGE_LENGTH 16
|
||
|
||
#define CP_OFF_DCE_DCC 2
|
||
#define CP_OFF_C_ALGO 7
|
||
|
||
#define DCE_MASK 0x80
|
||
#define DCC_MASK 0x40
|
||
#define RED_MASK 0x60
|
||
|
||
|
||
/* Control the compression with mode page 15. Algorithm not changed if zero.
|
||
|
||
The block descriptors are read and written because Sony SDT-7000 does not
|
||
work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
|
||
Including block descriptors should not cause any harm to other drives. */
|
||
|
||
static int st_compression(struct scsi_tape * STp, int state)
|
||
{
|
||
int retval;
|
||
int mpoffs; /* Offset to mode page start */
|
||
unsigned char *b_data = (STp->buffer)->b_data;
|
||
|
||
if (STp->ready != ST_READY)
|
||
return (-EIO);
|
||
|
||
/* Read the current page contents */
|
||
retval = read_mode_page(STp, COMPRESSION_PAGE, 0);
|
||
if (retval) {
|
||
DEBC_printk(STp, "Compression mode page not supported.\n");
|
||
return (-EIO);
|
||
}
|
||
|
||
mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH];
|
||
DEBC_printk(STp, "Compression state is %d.\n",
|
||
(b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0));
|
||
|
||
/* Check if compression can be changed */
|
||
if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) {
|
||
DEBC_printk(STp, "Compression not supported.\n");
|
||
return (-EIO);
|
||
}
|
||
|
||
/* Do the change */
|
||
if (state) {
|
||
b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK;
|
||
if (STp->c_algo != 0)
|
||
b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo;
|
||
}
|
||
else {
|
||
b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK;
|
||
if (STp->c_algo != 0)
|
||
b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */
|
||
}
|
||
|
||
retval = write_mode_page(STp, COMPRESSION_PAGE, 0);
|
||
if (retval) {
|
||
DEBC_printk(STp, "Compression change failed.\n");
|
||
return (-EIO);
|
||
}
|
||
DEBC_printk(STp, "Compression state changed to %d.\n", state);
|
||
|
||
STp->compression_changed = 1;
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Process the load and unload commands (does unload if the load code is zero) */
|
||
static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code)
|
||
{
|
||
int retval = (-EIO), timeout;
|
||
unsigned char cmd[MAX_COMMAND_SIZE];
|
||
struct st_partstat *STps;
|
||
struct st_request *SRpnt;
|
||
|
||
if (STp->ready != ST_READY && !load_code) {
|
||
if (STp->ready == ST_NO_TAPE)
|
||
return (-ENOMEDIUM);
|
||
else
|
||
return (-EIO);
|
||
}
|
||
|
||
memset(cmd, 0, MAX_COMMAND_SIZE);
|
||
cmd[0] = START_STOP;
|
||
if (load_code)
|
||
cmd[4] |= 1;
|
||
/*
|
||
* If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A
|
||
*/
|
||
if (load_code >= 1 + MT_ST_HPLOADER_OFFSET
|
||
&& load_code <= 6 + MT_ST_HPLOADER_OFFSET) {
|
||
DEBC_printk(STp, " Enhanced %sload slot %2d.\n",
|
||
(cmd[4]) ? "" : "un",
|
||
load_code - MT_ST_HPLOADER_OFFSET);
|
||
cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */
|
||
}
|
||
if (STp->immediate) {
|
||
cmd[1] = 1; /* Don't wait for completion */
|
||
timeout = STp->device->request_queue->rq_timeout;
|
||
}
|
||
else
|
||
timeout = STp->long_timeout;
|
||
|
||
DEBC(
|
||
if (!load_code)
|
||
st_printk(ST_DEB_MSG, STp, "Unloading tape.\n");
|
||
else
|
||
st_printk(ST_DEB_MSG, STp, "Loading tape.\n");
|
||
);
|
||
|
||
SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
|
||
timeout, MAX_RETRIES, 1);
|
||
if (!SRpnt)
|
||
return (STp->buffer)->syscall_result;
|
||
|
||
retval = (STp->buffer)->syscall_result;
|
||
st_release_request(SRpnt);
|
||
|
||
if (!retval) { /* SCSI command successful */
|
||
|
||
if (!load_code) {
|
||
STp->rew_at_close = 0;
|
||
STp->ready = ST_NO_TAPE;
|
||
}
|
||
else {
|
||
STp->rew_at_close = STp->autorew_dev;
|
||
retval = check_tape(STp, filp);
|
||
if (retval > 0)
|
||
retval = 0;
|
||
}
|
||
}
|
||
else {
|
||
STps = &(STp->ps[STp->partition]);
|
||
STps->drv_file = STps->drv_block = (-1);
|
||
}
|
||
|
||
return retval;
|
||
}
|
||
|
||
#if DEBUG
|
||
#define ST_DEB_FORWARD 0
|
||
#define ST_DEB_BACKWARD 1
|
||
static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd)
|
||
{
|
||
s32 sc;
|
||
|
||
if (!debugging)
|
||
return;
|
||
|
||
sc = cmd[2] & 0x80 ? 0xff000000 : 0;
|
||
sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4];
|
||
if (direction)
|
||
sc = -sc;
|
||
st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n",
|
||
direction ? "backward" : "forward", sc, units);
|
||
}
|
||
#else
|
||
#define ST_DEB_FORWARD 0
|
||
#define ST_DEB_BACKWARD 1
|
||
static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {}
|
||
#endif
|
||
|
||
|
||
/* Internal ioctl function */
|
||
static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg)
|
||
{
|
||
int timeout;
|
||
long ltmp;
|
||
int ioctl_result;
|
||
int chg_eof = 1;
|
||
unsigned char cmd[MAX_COMMAND_SIZE];
|
||
struct st_request *SRpnt;
|
||
struct st_partstat *STps;
|
||
int fileno, blkno, at_sm, undone;
|
||
int datalen = 0, direction = DMA_NONE;
|
||
|
||
WARN_ON(STp->buffer->do_dio != 0);
|
||
if (STp->ready != ST_READY) {
|
||
if (STp->ready == ST_NO_TAPE)
|
||
return (-ENOMEDIUM);
|
||
else
|
||
return (-EIO);
|
||
}
|
||
timeout = STp->long_timeout;
|
||
STps = &(STp->ps[STp->partition]);
|
||
fileno = STps->drv_file;
|
||
blkno = STps->drv_block;
|
||
at_sm = STps->at_sm;
|
||
|
||
memset(cmd, 0, MAX_COMMAND_SIZE);
|
||
switch (cmd_in) {
|
||
case MTFSFM:
|
||
chg_eof = 0; /* Changed from the FSF after this */
|
||
case MTFSF:
|
||
cmd[0] = SPACE;
|
||
cmd[1] = 0x01; /* Space FileMarks */
|
||
cmd[2] = (arg >> 16);
|
||
cmd[3] = (arg >> 8);
|
||
cmd[4] = arg;
|
||
deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd);
|
||
if (fileno >= 0)
|
||
fileno += arg;
|
||
blkno = 0;
|
||
at_sm &= (arg == 0);
|
||
break;
|
||
case MTBSFM:
|
||
chg_eof = 0; /* Changed from the FSF after this */
|
||
case MTBSF:
|
||
cmd[0] = SPACE;
|
||
cmd[1] = 0x01; /* Space FileMarks */
|
||
ltmp = (-arg);
|
||
cmd[2] = (ltmp >> 16);
|
||
cmd[3] = (ltmp >> 8);
|
||
cmd[4] = ltmp;
|
||
deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd);
|
||
if (fileno >= 0)
|
||
fileno -= arg;
|
||
blkno = (-1); /* We can't know the block number */
|
||
at_sm &= (arg == 0);
|
||
break;
|
||
case MTFSR:
|
||
cmd[0] = SPACE;
|
||
cmd[1] = 0x00; /* Space Blocks */
|
||
cmd[2] = (arg >> 16);
|
||
cmd[3] = (arg >> 8);
|
||
cmd[4] = arg;
|
||
deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd);
|
||
if (blkno >= 0)
|
||
blkno += arg;
|
||
at_sm &= (arg == 0);
|
||
break;
|
||
case MTBSR:
|
||
cmd[0] = SPACE;
|
||
cmd[1] = 0x00; /* Space Blocks */
|
||
ltmp = (-arg);
|
||
cmd[2] = (ltmp >> 16);
|
||
cmd[3] = (ltmp >> 8);
|
||
cmd[4] = ltmp;
|
||
deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd);
|
||
if (blkno >= 0)
|
||
blkno -= arg;
|
||
at_sm &= (arg == 0);
|
||
break;
|
||
case MTFSS:
|
||
cmd[0] = SPACE;
|
||
cmd[1] = 0x04; /* Space Setmarks */
|
||
cmd[2] = (arg >> 16);
|
||
cmd[3] = (arg >> 8);
|
||
cmd[4] = arg;
|
||
deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd);
|
||
if (arg != 0) {
|
||
blkno = fileno = (-1);
|
||
at_sm = 1;
|
||
}
|
||
break;
|
||
case MTBSS:
|
||
cmd[0] = SPACE;
|
||
cmd[1] = 0x04; /* Space Setmarks */
|
||
ltmp = (-arg);
|
||
cmd[2] = (ltmp >> 16);
|
||
cmd[3] = (ltmp >> 8);
|
||
cmd[4] = ltmp;
|
||
deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd);
|
||
if (arg != 0) {
|
||
blkno = fileno = (-1);
|
||
at_sm = 1;
|
||
}
|
||
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->request_queue->rq_timeout;
|
||
DEBC(
|
||
if (cmd_in != MTWSM)
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"Writing %d filemarks.\n",
|
||
cmd[2] * 65536 +
|
||
cmd[3] * 256 +
|
||
cmd[4]);
|
||
else
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"Writing %d setmarks.\n",
|
||
cmd[2] * 65536 +
|
||
cmd[3] * 256 +
|
||
cmd[4]);
|
||
)
|
||
if (fileno >= 0)
|
||
fileno += arg;
|
||
blkno = 0;
|
||
at_sm = (cmd_in == MTWSM);
|
||
break;
|
||
case MTREW:
|
||
cmd[0] = REZERO_UNIT;
|
||
if (STp->immediate) {
|
||
cmd[1] = 1; /* Don't wait for completion */
|
||
timeout = STp->device->request_queue->rq_timeout;
|
||
}
|
||
DEBC_printk(STp, "Rewinding tape.\n");
|
||
fileno = blkno = at_sm = 0;
|
||
break;
|
||
case MTNOP:
|
||
DEBC_printk(STp, "No op on tape.\n");
|
||
return 0; /* Should do something ? */
|
||
break;
|
||
case MTRETEN:
|
||
cmd[0] = START_STOP;
|
||
if (STp->immediate) {
|
||
cmd[1] = 1; /* Don't wait for completion */
|
||
timeout = STp->device->request_queue->rq_timeout;
|
||
}
|
||
cmd[4] = 3;
|
||
DEBC_printk(STp, "Retensioning tape.\n");
|
||
fileno = blkno = at_sm = 0;
|
||
break;
|
||
case MTEOM:
|
||
if (!STp->fast_mteom) {
|
||
/* space to the end of tape */
|
||
ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff);
|
||
fileno = STps->drv_file;
|
||
if (STps->eof >= ST_EOD_1)
|
||
return 0;
|
||
/* The next lines would hide the number of spaced FileMarks
|
||
That's why I inserted the previous lines. I had no luck
|
||
with detecting EOM with FSF, so we go now to EOM.
|
||
Joerg Weule */
|
||
} else
|
||
fileno = (-1);
|
||
cmd[0] = SPACE;
|
||
cmd[1] = 3;
|
||
DEBC_printk(STp, "Spacing to end of recorded medium.\n");
|
||
blkno = -1;
|
||
at_sm = 0;
|
||
break;
|
||
case MTERASE:
|
||
if (STp->write_prot)
|
||
return (-EACCES);
|
||
cmd[0] = ERASE;
|
||
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->request_queue->rq_timeout;
|
||
}
|
||
else
|
||
timeout = STp->long_timeout * 8;
|
||
|
||
DEBC_printk(STp, "Erasing tape.\n");
|
||
fileno = blkno = at_sm = 0;
|
||
break;
|
||
case MTSETBLK: /* Set block length */
|
||
case MTSETDENSITY: /* Set tape density */
|
||
case MTSETDRVBUFFER: /* Set drive buffering */
|
||
case SET_DENS_AND_BLK: /* Set density and block size */
|
||
chg_eof = 0;
|
||
if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
|
||
return (-EIO); /* Not allowed if data in buffer */
|
||
if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
|
||
(arg & MT_ST_BLKSIZE_MASK) != 0 &&
|
||
STp->max_block > 0 &&
|
||
((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
|
||
(arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) {
|
||
st_printk(KERN_WARNING, STp, "Illegal block size.\n");
|
||
return (-EINVAL);
|
||
}
|
||
cmd[0] = MODE_SELECT;
|
||
if ((STp->use_pf & USE_PF))
|
||
cmd[1] = MODE_SELECT_PAGE_FORMAT;
|
||
cmd[4] = datalen = 12;
|
||
direction = DMA_TO_DEVICE;
|
||
|
||
memset((STp->buffer)->b_data, 0, 12);
|
||
if (cmd_in == MTSETDRVBUFFER)
|
||
(STp->buffer)->b_data[2] = (arg & 7) << 4;
|
||
else
|
||
(STp->buffer)->b_data[2] =
|
||
STp->drv_buffer << 4;
|
||
(STp->buffer)->b_data[3] = 8; /* block descriptor length */
|
||
if (cmd_in == MTSETDENSITY) {
|
||
(STp->buffer)->b_data[4] = arg;
|
||
STp->density_changed = 1; /* At least we tried ;-) */
|
||
} else if (cmd_in == SET_DENS_AND_BLK)
|
||
(STp->buffer)->b_data[4] = arg >> 24;
|
||
else
|
||
(STp->buffer)->b_data[4] = STp->density;
|
||
if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
|
||
ltmp = arg & MT_ST_BLKSIZE_MASK;
|
||
if (cmd_in == MTSETBLK)
|
||
STp->blksize_changed = 1; /* At least we tried ;-) */
|
||
} else
|
||
ltmp = STp->block_size;
|
||
(STp->buffer)->b_data[9] = (ltmp >> 16);
|
||
(STp->buffer)->b_data[10] = (ltmp >> 8);
|
||
(STp->buffer)->b_data[11] = ltmp;
|
||
timeout = STp->device->request_queue->rq_timeout;
|
||
DEBC(
|
||
if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK)
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"Setting block size to %d bytes.\n",
|
||
(STp->buffer)->b_data[9] * 65536 +
|
||
(STp->buffer)->b_data[10] * 256 +
|
||
(STp->buffer)->b_data[11]);
|
||
if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK)
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"Setting density code to %x.\n",
|
||
(STp->buffer)->b_data[4]);
|
||
if (cmd_in == MTSETDRVBUFFER)
|
||
st_printk(ST_DEB_MSG, STp,
|
||
"Setting drive buffer code to %d.\n",
|
||
((STp->buffer)->b_data[2] >> 4) & 7);
|
||
)
|
||
break;
|
||
default:
|
||
return (-ENOSYS);
|
||
}
|
||
|
||
SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
|
||
timeout, MAX_RETRIES, 1);
|
||
if (!SRpnt)
|
||
return (STp->buffer)->syscall_result;
|
||
|
||
ioctl_result = (STp->buffer)->syscall_result;
|
||
|
||
if (!ioctl_result) { /* SCSI command successful */
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
STps->drv_block = blkno;
|
||
STps->drv_file = fileno;
|
||
STps->at_sm = at_sm;
|
||
|
||
if (cmd_in == MTBSFM)
|
||
ioctl_result = st_int_ioctl(STp, MTFSF, 1);
|
||
else if (cmd_in == MTFSFM)
|
||
ioctl_result = st_int_ioctl(STp, MTBSF, 1);
|
||
|
||
if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
|
||
STp->block_size = arg & MT_ST_BLKSIZE_MASK;
|
||
if (STp->block_size != 0) {
|
||
(STp->buffer)->buffer_blocks =
|
||
(STp->buffer)->buffer_size / STp->block_size;
|
||
}
|
||
(STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0;
|
||
if (cmd_in == SET_DENS_AND_BLK)
|
||
STp->density = arg >> MT_ST_DENSITY_SHIFT;
|
||
} else if (cmd_in == MTSETDRVBUFFER)
|
||
STp->drv_buffer = (arg & 7);
|
||
else if (cmd_in == MTSETDENSITY)
|
||
STp->density = arg;
|
||
|
||
if (cmd_in == MTEOM)
|
||
STps->eof = ST_EOD;
|
||
else if (cmd_in == MTFSF)
|
||
STps->eof = ST_FM;
|
||
else if (chg_eof)
|
||
STps->eof = ST_NOEOF;
|
||
|
||
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;
|
||
|
||
if (cmdstatp->flags & SENSE_EOM) {
|
||
if (cmd_in != MTBSF && cmd_in != MTBSFM &&
|
||
cmd_in != MTBSR && cmd_in != MTBSS)
|
||
STps->eof = ST_EOM_OK;
|
||
STps->drv_block = 0;
|
||
}
|
||
|
||
if (cmdstatp->remainder_valid)
|
||
undone = (int)cmdstatp->uremainder64;
|
||
else
|
||
undone = 0;
|
||
|
||
if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) &&
|
||
cmdstatp->have_sense &&
|
||
(cmdstatp->flags & SENSE_EOM)) {
|
||
if (cmdstatp->sense_hdr.sense_key == NO_SENSE ||
|
||
cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) {
|
||
ioctl_result = 0; /* EOF(s) written successfully at EOM */
|
||
STps->eof = ST_NOEOF;
|
||
} else { /* Writing EOF(s) failed */
|
||
if (fileno >= 0)
|
||
fileno -= undone;
|
||
if (undone < arg)
|
||
STps->eof = ST_NOEOF;
|
||
}
|
||
STps->drv_file = fileno;
|
||
} else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) {
|
||
if (fileno >= 0)
|
||
STps->drv_file = fileno - undone;
|
||
else
|
||
STps->drv_file = fileno;
|
||
STps->drv_block = -1;
|
||
STps->eof = ST_NOEOF;
|
||
} else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) {
|
||
if (arg > 0 && undone < 0) /* Some drives get this wrong */
|
||
undone = (-undone);
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file = fileno + undone;
|
||
STps->drv_block = 0;
|
||
STps->eof = ST_NOEOF;
|
||
} else if (cmd_in == MTFSR) {
|
||
if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file++;
|
||
STps->drv_block = 0;
|
||
STps->eof = ST_FM;
|
||
} else {
|
||
if (blkno >= undone)
|
||
STps->drv_block = blkno - undone;
|
||
else
|
||
STps->drv_block = (-1);
|
||
STps->eof = ST_NOEOF;
|
||
}
|
||
} else if (cmd_in == MTBSR) {
|
||
if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */
|
||
STps->drv_file--;
|
||
STps->drv_block = (-1);
|
||
} else {
|
||
if (arg > 0 && undone < 0) /* Some drives get this wrong */
|
||
undone = (-undone);
|
||
if (STps->drv_block >= 0)
|
||
STps->drv_block = blkno + undone;
|
||
}
|
||
STps->eof = ST_NOEOF;
|
||
} else if (cmd_in == MTEOM) {
|
||
STps->drv_file = (-1);
|
||
STps->drv_block = (-1);
|
||
STps->eof = ST_EOD;
|
||
} else if (cmd_in == MTSETBLK ||
|
||
cmd_in == MTSETDENSITY ||
|
||
cmd_in == MTSETDRVBUFFER ||
|
||
cmd_in == SET_DENS_AND_BLK) {
|
||
if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST &&
|
||
!(STp->use_pf & PF_TESTED)) {
|
||
/* Try the other possible state of Page Format if not
|
||
already tried */
|
||
STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
return st_int_ioctl(STp, cmd_in, arg);
|
||
}
|
||
} else if (chg_eof)
|
||
STps->eof = ST_NOEOF;
|
||
|
||
if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
|
||
STps->eof = ST_EOD;
|
||
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
}
|
||
|
||
return ioctl_result;
|
||
}
|
||
|
||
|
||
/* Get the tape position. If bt == 2, arg points into a kernel space mt_loc
|
||
structure. */
|
||
|
||
static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition,
|
||
int logical)
|
||
{
|
||
int result;
|
||
unsigned char scmd[MAX_COMMAND_SIZE];
|
||
struct st_request *SRpnt;
|
||
|
||
if (STp->ready != ST_READY)
|
||
return (-EIO);
|
||
|
||
memset(scmd, 0, MAX_COMMAND_SIZE);
|
||
if ((STp->device)->scsi_level < SCSI_2) {
|
||
scmd[0] = QFA_REQUEST_BLOCK;
|
||
scmd[4] = 3;
|
||
} else {
|
||
scmd[0] = READ_POSITION;
|
||
if (!logical && !STp->scsi2_logical)
|
||
scmd[1] = 1;
|
||
}
|
||
SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
|
||
STp->device->request_queue->rq_timeout,
|
||
MAX_READY_RETRIES, 1);
|
||
if (!SRpnt)
|
||
return (STp->buffer)->syscall_result;
|
||
|
||
if ((STp->buffer)->syscall_result != 0 ||
|
||
(STp->device->scsi_level >= SCSI_2 &&
|
||
((STp->buffer)->b_data[0] & 4) != 0)) {
|
||
*block = *partition = 0;
|
||
DEBC_printk(STp, " Can't read tape position.\n");
|
||
result = (-EIO);
|
||
} else {
|
||
result = 0;
|
||
if ((STp->device)->scsi_level < SCSI_2) {
|
||
*block = ((STp->buffer)->b_data[0] << 16)
|
||
+ ((STp->buffer)->b_data[1] << 8)
|
||
+ (STp->buffer)->b_data[2];
|
||
*partition = 0;
|
||
} else {
|
||
*block = ((STp->buffer)->b_data[4] << 24)
|
||
+ ((STp->buffer)->b_data[5] << 16)
|
||
+ ((STp->buffer)->b_data[6] << 8)
|
||
+ (STp->buffer)->b_data[7];
|
||
*partition = (STp->buffer)->b_data[1];
|
||
if (((STp->buffer)->b_data[0] & 0x80) &&
|
||
(STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */
|
||
STp->ps[0].drv_block = STp->ps[0].drv_file = 0;
|
||
}
|
||
DEBC_printk(STp, "Got tape pos. blk %d part %d.\n",
|
||
*block, *partition);
|
||
}
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
|
||
return result;
|
||
}
|
||
|
||
|
||
/* Set the tape block and partition. Negative partition means that only the
|
||
block should be set in vendor specific way. */
|
||
static int set_location(struct scsi_tape *STp, unsigned int block, int partition,
|
||
int logical)
|
||
{
|
||
struct st_partstat *STps;
|
||
int result, p;
|
||
unsigned int blk;
|
||
int timeout;
|
||
unsigned char scmd[MAX_COMMAND_SIZE];
|
||
struct st_request *SRpnt;
|
||
|
||
if (STp->ready != ST_READY)
|
||
return (-EIO);
|
||
timeout = STp->long_timeout;
|
||
STps = &(STp->ps[STp->partition]);
|
||
|
||
DEBC_printk(STp, "Setting block to %d and partition to %d.\n",
|
||
block, partition);
|
||
DEB(if (partition < 0)
|
||
return (-EIO); )
|
||
|
||
/* Update the location at the partition we are leaving */
|
||
if ((!STp->can_partitions && partition != 0) ||
|
||
partition >= ST_NBR_PARTITIONS)
|
||
return (-EINVAL);
|
||
if (partition != STp->partition) {
|
||
if (get_location(STp, &blk, &p, 1))
|
||
STps->last_block_valid = 0;
|
||
else {
|
||
STps->last_block_valid = 1;
|
||
STps->last_block_visited = blk;
|
||
DEBC_printk(STp, "Visited block %d for "
|
||
"partition %d saved.\n",
|
||
blk, STp->partition);
|
||
}
|
||
}
|
||
|
||
memset(scmd, 0, MAX_COMMAND_SIZE);
|
||
if ((STp->device)->scsi_level < SCSI_2) {
|
||
scmd[0] = QFA_SEEK_BLOCK;
|
||
scmd[2] = (block >> 16);
|
||
scmd[3] = (block >> 8);
|
||
scmd[4] = block;
|
||
scmd[5] = 0;
|
||
} else {
|
||
scmd[0] = SEEK_10;
|
||
scmd[3] = (block >> 24);
|
||
scmd[4] = (block >> 16);
|
||
scmd[5] = (block >> 8);
|
||
scmd[6] = block;
|
||
if (!logical && !STp->scsi2_logical)
|
||
scmd[1] = 4;
|
||
if (STp->partition != partition) {
|
||
scmd[1] |= 2;
|
||
scmd[8] = partition;
|
||
DEBC_printk(STp, "Trying to change partition "
|
||
"from %d to %d\n", STp->partition,
|
||
partition);
|
||
}
|
||
}
|
||
if (STp->immediate) {
|
||
scmd[1] |= 1; /* Don't wait for completion */
|
||
timeout = STp->device->request_queue->rq_timeout;
|
||
}
|
||
|
||
SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
|
||
timeout, MAX_READY_RETRIES, 1);
|
||
if (!SRpnt)
|
||
return (STp->buffer)->syscall_result;
|
||
|
||
STps->drv_block = STps->drv_file = (-1);
|
||
STps->eof = ST_NOEOF;
|
||
if ((STp->buffer)->syscall_result != 0) {
|
||
result = (-EIO);
|
||
if (STp->can_partitions &&
|
||
(STp->device)->scsi_level >= SCSI_2 &&
|
||
(p = find_partition(STp)) >= 0)
|
||
STp->partition = p;
|
||
} else {
|
||
if (STp->can_partitions) {
|
||
STp->partition = partition;
|
||
STps = &(STp->ps[partition]);
|
||
if (!STps->last_block_valid ||
|
||
STps->last_block_visited != block) {
|
||
STps->at_sm = 0;
|
||
STps->rw = ST_IDLE;
|
||
}
|
||
} else
|
||
STps->at_sm = 0;
|
||
if (block == 0)
|
||
STps->drv_block = STps->drv_file = 0;
|
||
result = 0;
|
||
}
|
||
|
||
st_release_request(SRpnt);
|
||
SRpnt = NULL;
|
||
|
||
return result;
|
||
}
|
||
|
||
|
||
/* Find the current partition number for the drive status. Called from open and
|
||
returns either partition number of negative error code. */
|
||
static int find_partition(struct scsi_tape *STp)
|
||
{
|
||
int i, partition;
|
||
unsigned int block;
|
||
|
||
if ((i = get_location(STp, &block, &partition, 1)) < 0)
|
||
return i;
|
||
if (partition >= ST_NBR_PARTITIONS)
|
||
return (-EIO);
|
||
return partition;
|
||
}
|
||
|
||
|
||
/* Change the partition if necessary */
|
||
static int switch_partition(struct scsi_tape *STp)
|
||
{
|
||
struct st_partstat *STps;
|
||
|
||
if (STp->partition == STp->new_partition)
|
||
return 0;
|
||
STps = &(STp->ps[STp->new_partition]);
|
||
if (!STps->last_block_valid)
|
||
STps->last_block_visited = 0;
|
||
return set_location(STp, STps->last_block_visited, STp->new_partition, 1);
|
||
}
|
||
|
||
/* Functions for reading and writing the medium partition mode page. */
|
||
|
||
#define PART_PAGE 0x11
|
||
#define PART_PAGE_FIXED_LENGTH 8
|
||
|
||
#define PP_OFF_MAX_ADD_PARTS 2
|
||
#define PP_OFF_NBR_ADD_PARTS 3
|
||
#define PP_OFF_FLAGS 4
|
||
#define PP_OFF_PART_UNITS 6
|
||
#define PP_OFF_RESERVED 7
|
||
|
||
#define PP_BIT_IDP 0x20
|
||
#define PP_BIT_FDP 0x80
|
||
#define PP_MSK_PSUM_MB 0x10
|
||
#define PP_MSK_PSUM_UNITS 0x18
|
||
#define PP_MSK_POFM 0x04
|
||
|
||
/* Get the number of partitions on the tape. As a side effect reads the
|
||
mode page into the tape buffer. */
|
||
static int nbr_partitions(struct scsi_tape *STp)
|
||
{
|
||
int result;
|
||
|
||
if (STp->ready != ST_READY)
|
||
return (-EIO);
|
||
|
||
result = read_mode_page(STp, PART_PAGE, 1);
|
||
|
||
if (result) {
|
||
DEBC_printk(STp, "Can't read medium partition page.\n");
|
||
result = (-EIO);
|
||
} else {
|
||
result = (STp->buffer)->b_data[MODE_HEADER_LENGTH +
|
||
PP_OFF_NBR_ADD_PARTS] + 1;
|
||
DEBC_printk(STp, "Number of partitions %d.\n", result);
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
|
||
static int format_medium(struct scsi_tape *STp, int format)
|
||
{
|
||
int result = 0;
|
||
int timeout = STp->long_timeout;
|
||
unsigned char scmd[MAX_COMMAND_SIZE];
|
||
struct st_request *SRpnt;
|
||
|
||
memset(scmd, 0, MAX_COMMAND_SIZE);
|
||
scmd[0] = FORMAT_UNIT;
|
||
scmd[2] = format;
|
||
if (STp->immediate) {
|
||
scmd[1] |= 1; /* Don't wait for completion */
|
||
timeout = STp->device->request_queue->rq_timeout;
|
||
}
|
||
DEBC_printk(STp, "Sending FORMAT MEDIUM\n");
|
||
SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
|
||
timeout, MAX_RETRIES, 1);
|
||
if (!SRpnt)
|
||
result = STp->buffer->syscall_result;
|
||
return result;
|
||
}
|
||
|
||
|
||
/* Partition the tape into two partitions if size > 0 or one partition if
|
||
size == 0.
|
||
|
||
The block descriptors are read and written because Sony SDT-7000 does not
|
||
work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>).
|
||
|
||
My HP C1533A drive returns only one partition size field. This is used to
|
||
set the size of partition 1. There is no size field for the default partition.
|
||
Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is
|
||
used to set the size of partition 1 (this is what the SCSI-3 standard specifies).
|
||
The following algorithm is used to accommodate both drives: if the number of
|
||
partition size fields is greater than the maximum number of additional partitions
|
||
in the mode page, the second field is used. Otherwise the first field is used.
|
||
|
||
For Seagate DDS drives the page length must be 8 when no partitions is defined
|
||
and 10 when 1 partition is defined (information from Eric Lee Green). This is
|
||
is acceptable also to some other old drives and enforced if the first partition
|
||
size field is used for the first additional partition size.
|
||
|
||
For drives that advertize SCSI-3 or newer, use the SSC-3 methods.
|
||
*/
|
||
static int partition_tape(struct scsi_tape *STp, int size)
|
||
{
|
||
int result;
|
||
int target_partition;
|
||
bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false;
|
||
int pgo, psd_cnt, psdo;
|
||
int psum = PP_MSK_PSUM_MB, units = 0;
|
||
unsigned char *bp;
|
||
|
||
result = read_mode_page(STp, PART_PAGE, 0);
|
||
if (result) {
|
||
DEBC_printk(STp, "Can't read partition mode page.\n");
|
||
return result;
|
||
}
|
||
target_partition = 1;
|
||
if (size < 0) {
|
||
target_partition = 0;
|
||
size = -size;
|
||
}
|
||
|
||
/* The mode page is in the buffer. Let's modify it and write it. */
|
||
bp = (STp->buffer)->b_data;
|
||
pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH];
|
||
DEBC_printk(STp, "Partition page length is %d bytes.\n",
|
||
bp[pgo + MP_OFF_PAGE_LENGTH] + 2);
|
||
|
||
psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2;
|
||
|
||
if (scsi3) {
|
||
needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0;
|
||
if (needs_format && size == 0) {
|
||
/* No need to write the mode page when clearing
|
||
* partitioning
|
||
*/
|
||
DEBC_printk(STp, "Formatting tape with one partition.\n");
|
||
result = format_medium(STp, 0);
|
||
goto out;
|
||
}
|
||
if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */
|
||
psd_cnt = 2;
|
||
if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) {
|
||
/* Use units scaling for large partitions if the device
|
||
* suggests it and no precision lost. Required for IBM
|
||
* TS1140/50 drives that don't support MB units.
|
||
*/
|
||
if (size >= 1000 && (size % 1000) == 0) {
|
||
size /= 1000;
|
||
psum = PP_MSK_PSUM_UNITS;
|
||
units = 9; /* GB */
|
||
}
|
||
}
|
||
/* Try it anyway if too large to specify in MB */
|
||
if (psum == PP_MSK_PSUM_MB && size >= 65534) {
|
||
size /= 1000;
|
||
psum = PP_MSK_PSUM_UNITS;
|
||
units = 9; /* GB */
|
||
}
|
||
}
|
||
|
||
if (size >= 65535 || /* Does not fit into two bytes */
|
||
(target_partition == 0 && psd_cnt < 2)) {
|
||
result = -EINVAL;
|
||
goto out;
|
||
}
|
||
|
||
psdo = pgo + PART_PAGE_FIXED_LENGTH;
|
||
/* The second condition is for HP DDS which use only one partition size
|
||
* descriptor
|
||
*/
|
||
if (target_partition > 0 &&
|
||
(psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] ||
|
||
bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) {
|
||
bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */
|
||
psdo += 2;
|
||
}
|
||
memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2);
|
||
|
||
DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n",
|
||
psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS],
|
||
bp[pgo + PP_OFF_NBR_ADD_PARTS]);
|
||
|
||
if (size == 0) {
|
||
bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0;
|
||
if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS])
|
||
bp[pgo + MP_OFF_PAGE_LENGTH] = 6;
|
||
DEBC_printk(STp, "Formatting tape with one partition.\n");
|
||
} else {
|
||
bp[psdo] = (size >> 8) & 0xff;
|
||
bp[psdo + 1] = size & 0xff;
|
||
if (target_partition == 0)
|
||
bp[psdo + 2] = bp[psdo + 3] = 0xff;
|
||
bp[pgo + 3] = 1;
|
||
if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8)
|
||
bp[pgo + MP_OFF_PAGE_LENGTH] = 8;
|
||
DEBC_printk(STp,
|
||
"Formatting tape with two partitions (%i = %d MB).\n",
|
||
target_partition, units > 0 ? size * 1000 : size);
|
||
}
|
||
bp[pgo + PP_OFF_PART_UNITS] = 0;
|
||
bp[pgo + PP_OFF_RESERVED] = 0;
|
||
if (size != 1 || units != 0) {
|
||
bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum |
|
||
(bp[pgo + PP_OFF_FLAGS] & 0x07);
|
||
bp[pgo + PP_OFF_PART_UNITS] = units;
|
||
} else
|
||
bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP |
|
||
(bp[pgo + PP_OFF_FLAGS] & 0x1f);
|
||
bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2;
|
||
|
||
result = write_mode_page(STp, PART_PAGE, 1);
|
||
|
||
if (!result && needs_format)
|
||
result = format_medium(STp, 1);
|
||
|
||
if (result) {
|
||
st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n");
|
||
result = (-EIO);
|
||
}
|
||
|
||
out:
|
||
return result;
|
||
}
|
||
|
||
|
||
|
||
/* The ioctl command */
|
||
static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
|
||
{
|
||
int i, cmd_nr, cmd_type, bt;
|
||
int retval = 0;
|
||
unsigned int blk;
|
||
struct scsi_tape *STp = file->private_data;
|
||
struct st_modedef *STm;
|
||
struct st_partstat *STps;
|
||
void __user *p = (void __user *)arg;
|
||
|
||
if (mutex_lock_interruptible(&STp->lock))
|
||
return -ERESTARTSYS;
|
||
|
||
DEB(
|
||
if (debugging && !STp->in_use) {
|
||
st_printk(ST_DEB_MSG, STp, "Incorrect device.\n");
|
||
retval = (-EIO);
|
||
goto out;
|
||
} ) /* end DEB */
|
||
|
||
STm = &(STp->modes[STp->current_mode]);
|
||
STps = &(STp->ps[STp->partition]);
|
||
|
||
/*
|
||
* If we are in the middle of error recovery, don't let anyone
|
||
* else try and use this device. Also, if error recovery fails, it
|
||
* may try and take the device offline, in which case all further
|
||
* access to the device is prohibited.
|
||
*/
|
||
retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in,
|
||
file->f_flags & O_NDELAY);
|
||
if (retval)
|
||
goto out;
|
||
|
||
cmd_type = _IOC_TYPE(cmd_in);
|
||
cmd_nr = _IOC_NR(cmd_in);
|
||
|
||
if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
|
||
struct mtop mtc;
|
||
|
||
if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
|
||
retval = (-EINVAL);
|
||
goto out;
|
||
}
|
||
|
||
i = copy_from_user(&mtc, p, sizeof(struct mtop));
|
||
if (i) {
|
||
retval = (-EFAULT);
|
||
goto out;
|
||
}
|
||
|
||
if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
|
||
st_printk(KERN_WARNING, STp,
|
||
"MTSETDRVBUFFER only allowed for root.\n");
|
||
retval = (-EPERM);
|
||
goto out;
|
||
}
|
||
if (!STm->defined &&
|
||
(mtc.mt_op != MTSETDRVBUFFER &&
|
||
(mtc.mt_count & MT_ST_OPTIONS) == 0)) {
|
||
retval = (-ENXIO);
|
||
goto out;
|
||
}
|
||
|
||
if (!STp->pos_unknown) {
|
||
|
||
if (STps->eof == ST_FM_HIT) {
|
||
if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
|
||
mtc.mt_op == MTEOM) {
|
||
mtc.mt_count -= 1;
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file += 1;
|
||
} else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
|
||
mtc.mt_count += 1;
|
||
if (STps->drv_file >= 0)
|
||
STps->drv_file += 1;
|
||
}
|
||
}
|
||
|
||
if (mtc.mt_op == MTSEEK) {
|
||
/* Old position must be restored if partition will be
|
||
changed */
|
||
i = !STp->can_partitions ||
|
||
(STp->new_partition != STp->partition);
|
||
} else {
|
||
i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
|
||
mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
|
||
mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
|
||
mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM ||
|
||
mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM ||
|
||
mtc.mt_op == MTCOMPRESSION;
|
||
}
|
||
i = flush_buffer(STp, i);
|
||
if (i < 0) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
if (STps->rw == ST_WRITING &&
|
||
(mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
|
||
mtc.mt_op == MTSEEK ||
|
||
mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) {
|
||
i = st_int_ioctl(STp, MTWEOF, 1);
|
||
if (i < 0) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)
|
||
mtc.mt_count++;
|
||
STps->rw = ST_IDLE;
|
||
}
|
||
|
||
} else {
|
||
/*
|
||
* If there was a bus reset, block further access
|
||
* to this device. If the user wants to rewind the tape,
|
||
* then reset the flag and allow access again.
|
||
*/
|
||
if (mtc.mt_op != MTREW &&
|
||
mtc.mt_op != MTOFFL &&
|
||
mtc.mt_op != MTRETEN &&
|
||
mtc.mt_op != MTERASE &&
|
||
mtc.mt_op != MTSEEK &&
|
||
mtc.mt_op != MTEOM) {
|
||
retval = (-EIO);
|
||
goto out;
|
||
}
|
||
reset_state(STp);
|
||
/* remove this when the midlevel properly clears was_reset */
|
||
STp->device->was_reset = 0;
|
||
}
|
||
|
||
if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
|
||
mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
|
||
mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
|
||
STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
|
||
|
||
if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
|
||
do_door_lock(STp, 0); /* Ignore result! */
|
||
|
||
if (mtc.mt_op == MTSETDRVBUFFER &&
|
||
(mtc.mt_count & MT_ST_OPTIONS) != 0) {
|
||
retval = st_set_options(STp, mtc.mt_count);
|
||
goto out;
|
||
}
|
||
|
||
if (mtc.mt_op == MTSETPART) {
|
||
if (!STp->can_partitions ||
|
||
mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) {
|
||
retval = (-EINVAL);
|
||
goto out;
|
||
}
|
||
if (mtc.mt_count >= STp->nbr_partitions &&
|
||
(STp->nbr_partitions = nbr_partitions(STp)) < 0) {
|
||
retval = (-EIO);
|
||
goto out;
|
||
}
|
||
if (mtc.mt_count >= STp->nbr_partitions) {
|
||
retval = (-EINVAL);
|
||
goto out;
|
||
}
|
||
STp->new_partition = mtc.mt_count;
|
||
retval = 0;
|
||
goto out;
|
||
}
|
||
|
||
if (mtc.mt_op == MTMKPART) {
|
||
if (!STp->can_partitions) {
|
||
retval = (-EINVAL);
|
||
goto out;
|
||
}
|
||
i = do_load_unload(STp, file, 1);
|
||
if (i < 0) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
i = partition_tape(STp, mtc.mt_count);
|
||
if (i < 0) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
for (i = 0; i < ST_NBR_PARTITIONS; i++) {
|
||
STp->ps[i].rw = ST_IDLE;
|
||
STp->ps[i].at_sm = 0;
|
||
STp->ps[i].last_block_valid = 0;
|
||
}
|
||
STp->partition = STp->new_partition = 0;
|
||
STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1;
|
||
STps->drv_block = STps->drv_file = 0;
|
||
retval = 0;
|
||
goto out;
|
||
}
|
||
|
||
if (mtc.mt_op == MTSEEK) {
|
||
i = set_location(STp, mtc.mt_count, STp->new_partition, 0);
|
||
if (!STp->can_partitions)
|
||
STp->ps[0].rw = ST_IDLE;
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
|
||
if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) {
|
||
retval = do_load_unload(STp, file, 0);
|
||
goto out;
|
||
}
|
||
|
||
if (mtc.mt_op == MTLOAD) {
|
||
retval = do_load_unload(STp, file, max(1, mtc.mt_count));
|
||
goto out;
|
||
}
|
||
|
||
if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) {
|
||
retval = do_door_lock(STp, (mtc.mt_op == MTLOCK));
|
||
goto out;
|
||
}
|
||
|
||
if (STp->can_partitions && STp->ready == ST_READY &&
|
||
(i = switch_partition(STp)) < 0) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
|
||
if (mtc.mt_op == MTCOMPRESSION)
|
||
retval = st_compression(STp, (mtc.mt_count & 1));
|
||
else
|
||
retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count);
|
||
goto out;
|
||
}
|
||
if (!STm->defined) {
|
||
retval = (-ENXIO);
|
||
goto out;
|
||
}
|
||
|
||
if ((i = flush_buffer(STp, 0)) < 0) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
if (STp->can_partitions &&
|
||
(i = switch_partition(STp)) < 0) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
|
||
if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) {
|
||
struct mtget mt_status;
|
||
|
||
if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) {
|
||
retval = (-EINVAL);
|
||
goto out;
|
||
}
|
||
|
||
mt_status.mt_type = STp->tape_type;
|
||
mt_status.mt_dsreg =
|
||
((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) |
|
||
((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK);
|
||
mt_status.mt_blkno = STps->drv_block;
|
||
mt_status.mt_fileno = STps->drv_file;
|
||
if (STp->block_size != 0) {
|
||
if (STps->rw == ST_WRITING)
|
||
mt_status.mt_blkno +=
|
||
(STp->buffer)->buffer_bytes / STp->block_size;
|
||
else if (STps->rw == ST_READING)
|
||
mt_status.mt_blkno -=
|
||
((STp->buffer)->buffer_bytes +
|
||
STp->block_size - 1) / STp->block_size;
|
||
}
|
||
|
||
mt_status.mt_gstat = 0;
|
||
if (STp->drv_write_prot)
|
||
mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff);
|
||
if (mt_status.mt_blkno == 0) {
|
||
if (mt_status.mt_fileno == 0)
|
||
mt_status.mt_gstat |= GMT_BOT(0xffffffff);
|
||
else
|
||
mt_status.mt_gstat |= GMT_EOF(0xffffffff);
|
||
}
|
||
mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT);
|
||
mt_status.mt_resid = STp->partition;
|
||
if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR)
|
||
mt_status.mt_gstat |= GMT_EOT(0xffffffff);
|
||
else if (STps->eof >= ST_EOM_OK)
|
||
mt_status.mt_gstat |= GMT_EOD(0xffffffff);
|
||
if (STp->density == 1)
|
||
mt_status.mt_gstat |= GMT_D_800(0xffffffff);
|
||
else if (STp->density == 2)
|
||
mt_status.mt_gstat |= GMT_D_1600(0xffffffff);
|
||
else if (STp->density == 3)
|
||
mt_status.mt_gstat |= GMT_D_6250(0xffffffff);
|
||
if (STp->ready == ST_READY)
|
||
mt_status.mt_gstat |= GMT_ONLINE(0xffffffff);
|
||
if (STp->ready == ST_NO_TAPE)
|
||
mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff);
|
||
if (STps->at_sm)
|
||
mt_status.mt_gstat |= GMT_SM(0xffffffff);
|
||
if (STm->do_async_writes ||
|
||
(STm->do_buffer_writes && STp->block_size != 0) ||
|
||
STp->drv_buffer != 0)
|
||
mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff);
|
||
if (STp->cleaning_req)
|
||
mt_status.mt_gstat |= GMT_CLN(0xffffffff);
|
||
|
||
i = copy_to_user(p, &mt_status, sizeof(struct mtget));
|
||
if (i) {
|
||
retval = (-EFAULT);
|
||
goto out;
|
||
}
|
||
|
||
STp->recover_reg = 0; /* Clear after read */
|
||
retval = 0;
|
||
goto out;
|
||
} /* End of MTIOCGET */
|
||
if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) {
|
||
struct mtpos mt_pos;
|
||
if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) {
|
||
retval = (-EINVAL);
|
||
goto out;
|
||
}
|
||
if ((i = get_location(STp, &blk, &bt, 0)) < 0) {
|
||
retval = i;
|
||
goto out;
|
||
}
|
||
mt_pos.mt_blkno = blk;
|
||
i = copy_to_user(p, &mt_pos, sizeof(struct mtpos));
|
||
if (i)
|
||
retval = (-EFAULT);
|
||
goto out;
|
||
}
|
||
mutex_unlock(&STp->lock);
|
||
switch (cmd_in) {
|
||
case SCSI_IOCTL_GET_IDLUN:
|
||
case SCSI_IOCTL_GET_BUS_NUMBER:
|
||
break;
|
||
default:
|
||
if ((cmd_in == SG_IO ||
|
||
cmd_in == SCSI_IOCTL_SEND_COMMAND ||
|
||
cmd_in == CDROM_SEND_PACKET) &&
|
||
!capable(CAP_SYS_RAWIO))
|
||
i = -EPERM;
|
||
else
|
||
i = scsi_cmd_ioctl(STp->disk->queue, STp->disk,
|
||
file->f_mode, cmd_in, p);
|
||
if (i != -ENOTTY)
|
||
return i;
|
||
break;
|
||
}
|
||
retval = scsi_ioctl(STp->device, cmd_in, p);
|
||
if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */
|
||
STp->rew_at_close = 0;
|
||
STp->ready = ST_NO_TAPE;
|
||
}
|
||
return retval;
|
||
|
||
out:
|
||
mutex_unlock(&STp->lock);
|
||
return retval;
|
||
}
|
||
|
||
#ifdef CONFIG_COMPAT
|
||
static long st_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
||
{
|
||
struct scsi_tape *STp = file->private_data;
|
||
struct scsi_device *sdev = STp->device;
|
||
int ret = -ENOIOCTLCMD;
|
||
if (sdev->host->hostt->compat_ioctl) {
|
||
|
||
ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
|
||
|
||
}
|
||
return ret;
|
||
}
|
||
#endif
|
||
|
||
|
||
|
||
/* Try to allocate a new tape buffer. Calling function must not hold
|
||
dev_arr_lock. */
|
||
static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
|
||
{
|
||
struct st_buffer *tb;
|
||
|
||
tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL);
|
||
if (!tb) {
|
||
printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
|
||
return NULL;
|
||
}
|
||
tb->frp_segs = 0;
|
||
tb->use_sg = max_sg;
|
||
tb->dma = need_dma;
|
||
tb->buffer_size = 0;
|
||
|
||
tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *),
|
||
GFP_KERNEL);
|
||
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, max_segs, b_size, order, got;
|
||
gfp_t priority;
|
||
|
||
if (new_size <= STbuffer->buffer_size)
|
||
return 1;
|
||
|
||
if (STbuffer->buffer_size <= PAGE_SIZE)
|
||
normalize_buffer(STbuffer); /* Avoid extra segment */
|
||
|
||
max_segs = STbuffer->use_sg;
|
||
|
||
priority = GFP_KERNEL | __GFP_NOWARN;
|
||
if (need_dma)
|
||
priority |= GFP_DMA;
|
||
|
||
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;) {
|
||
struct page *page;
|
||
|
||
page = alloc_pages(priority, order);
|
||
if (!page) {
|
||
DEB(STbuffer->buffer_size = got);
|
||
normalize_buffer(STbuffer);
|
||
return 0;
|
||
}
|
||
|
||
STbuffer->frp_segs += 1;
|
||
got += b_size;
|
||
STbuffer->buffer_size = got;
|
||
STbuffer->reserved_pages[segs] = page;
|
||
segs++;
|
||
}
|
||
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 = STbuffer->reserved_page_order;
|
||
|
||
for (i = 0; i < STbuffer->frp_segs; i++) {
|
||
__free_pages(STbuffer->reserved_pages[i], order);
|
||
STbuffer->buffer_size -= (PAGE_SIZE << order);
|
||
}
|
||
STbuffer->frp_segs = 0;
|
||
STbuffer->sg_segs = 0;
|
||
STbuffer->reserved_page_order = 0;
|
||
STbuffer->map_data.offset = 0;
|
||
}
|
||
|
||
|
||
/* Move data from the user buffer to the tape buffer. Returns zero (success) or
|
||
negative error code. */
|
||
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 >= 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++) {
|
||
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;
|
||
st_bp->buffer_bytes += cnt;
|
||
ubp += cnt;
|
||
offset = 0;
|
||
}
|
||
if (do_count) /* Should never happen */
|
||
return (-EIO);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Move data from the tape buffer to the user buffer. Returns zero (success) or
|
||
negative error code. */
|
||
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 >= 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++) {
|
||
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;
|
||
st_bp->buffer_bytes -= cnt;
|
||
st_bp->read_pointer += cnt;
|
||
ubp += cnt;
|
||
offset = 0;
|
||
}
|
||
if (do_count) /* Should never happen */
|
||
return (-EIO);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Move data towards start of buffer */
|
||
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;
|
||
|
||
total=st_bp->buffer_bytes - offset;
|
||
for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) {
|
||
src_offset = offset;
|
||
if (src_offset < length)
|
||
break;
|
||
offset -= length;
|
||
}
|
||
|
||
st_bp->buffer_bytes = st_bp->read_pointer = total;
|
||
for (dst_seg=dst_offset=0; total > 0; ) {
|
||
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 >= length) {
|
||
src_seg++;
|
||
src_offset = 0;
|
||
}
|
||
dst_offset += count;
|
||
if (dst_offset >= length) {
|
||
dst_seg++;
|
||
dst_offset = 0;
|
||
}
|
||
total -= count;
|
||
}
|
||
}
|
||
|
||
/* Validate the options from command line or module parameters */
|
||
static void validate_options(void)
|
||
{
|
||
if (buffer_kbs > 0)
|
||
st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE;
|
||
if (max_sg_segs >= ST_FIRST_SG)
|
||
st_max_sg_segs = max_sg_segs;
|
||
}
|
||
|
||
#ifndef MODULE
|
||
/* Set the boot options. Syntax is defined in Documenation/scsi/st.txt.
|
||
*/
|
||
static int __init st_setup(char *str)
|
||
{
|
||
int i, len, ints[5];
|
||
char *stp;
|
||
|
||
stp = get_options(str, ARRAY_SIZE(ints), ints);
|
||
|
||
if (ints[0] > 0) {
|
||
for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++)
|
||
if (parms[i].val)
|
||
*parms[i].val = ints[i + 1];
|
||
} else {
|
||
while (stp != NULL) {
|
||
for (i = 0; i < ARRAY_SIZE(parms); i++) {
|
||
len = strlen(parms[i].name);
|
||
if (!strncmp(stp, parms[i].name, len) &&
|
||
(*(stp + len) == ':' || *(stp + len) == '=')) {
|
||
if (parms[i].val)
|
||
*parms[i].val =
|
||
simple_strtoul(stp + len + 1, NULL, 0);
|
||
else
|
||
printk(KERN_WARNING "st: Obsolete parameter %s\n",
|
||
parms[i].name);
|
||
break;
|
||
}
|
||
}
|
||
if (i >= ARRAY_SIZE(parms))
|
||
printk(KERN_WARNING "st: invalid parameter in '%s'\n",
|
||
stp);
|
||
stp = strchr(stp, ',');
|
||
if (stp)
|
||
stp++;
|
||
}
|
||
}
|
||
|
||
validate_options();
|
||
|
||
return 1;
|
||
}
|
||
|
||
__setup("st=", st_setup);
|
||
|
||
#endif
|
||
|
||
static const struct file_operations st_fops =
|
||
{
|
||
.owner = THIS_MODULE,
|
||
.read = st_read,
|
||
.write = st_write,
|
||
.unlocked_ioctl = st_ioctl,
|
||
#ifdef CONFIG_COMPAT
|
||
.compat_ioctl = st_compat_ioctl,
|
||
#endif
|
||
.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;
|
||
STm->cdevs[rew] = cdev;
|
||
|
||
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;
|
||
}
|
||
|
||
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]);
|
||
out:
|
||
STm->cdevs[rew] = NULL;
|
||
STm->devs[rew] = NULL;
|
||
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 scsi_tape *tpnt = NULL;
|
||
struct st_modedef *STm;
|
||
struct st_partstat *STps;
|
||
struct st_buffer *buffer;
|
||
int i, error;
|
||
char *stp;
|
||
|
||
if (SDp->type != TYPE_TAPE)
|
||
return -ENODEV;
|
||
if ((stp = st_incompatible(SDp))) {
|
||
sdev_printk(KERN_INFO, SDp, "Found incompatible tape\n");
|
||
sdev_printk(KERN_INFO, SDp,
|
||
"st: The suggested driver is %s.\n", stp);
|
||
return -ENODEV;
|
||
}
|
||
|
||
scsi_autopm_get_device(SDp);
|
||
i = queue_max_segments(SDp->request_queue);
|
||
if (st_max_sg_segs < i)
|
||
i = st_max_sg_segs;
|
||
buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
|
||
if (buffer == NULL) {
|
||
sdev_printk(KERN_ERR, SDp,
|
||
"st: Can't allocate new tape buffer. "
|
||
"Device not attached.\n");
|
||
goto out;
|
||
}
|
||
|
||
disk = alloc_disk(1);
|
||
if (!disk) {
|
||
sdev_printk(KERN_ERR, SDp,
|
||
"st: out of memory. Device not attached.\n");
|
||
goto out_buffer_free;
|
||
}
|
||
|
||
tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
|
||
if (tpnt == NULL) {
|
||
sdev_printk(KERN_ERR, SDp,
|
||
"st: Can't allocate device descriptor.\n");
|
||
goto out_put_disk;
|
||
}
|
||
kref_init(&tpnt->kref);
|
||
tpnt->disk = disk;
|
||
disk->private_data = &tpnt->driver;
|
||
/* SCSI tape doesn't register this gendisk via add_disk(). Manually
|
||
* take queue reference that release_disk() expects. */
|
||
if (!blk_get_queue(SDp->request_queue))
|
||
goto out_put_disk;
|
||
disk->queue = SDp->request_queue;
|
||
tpnt->driver = &st_template;
|
||
|
||
tpnt->device = SDp;
|
||
if (SDp->scsi_level <= 2)
|
||
tpnt->tape_type = MT_ISSCSI1;
|
||
else
|
||
tpnt->tape_type = MT_ISSCSI2;
|
||
|
||
tpnt->buffer = buffer;
|
||
tpnt->buffer->last_SRpnt = NULL;
|
||
|
||
tpnt->inited = 0;
|
||
tpnt->dirty = 0;
|
||
tpnt->in_use = 0;
|
||
tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
|
||
tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
|
||
tpnt->use_pf = (SDp->scsi_level >= SCSI_2);
|
||
tpnt->density = 0;
|
||
tpnt->do_auto_lock = ST_AUTO_LOCK;
|
||
tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */
|
||
tpnt->can_partitions = 0;
|
||
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;
|
||
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;
|
||
|
||
for (i = 0; i < ST_NBR_MODES; i++) {
|
||
STm = &(tpnt->modes[i]);
|
||
STm->defined = 0;
|
||
STm->sysv = ST_SYSV;
|
||
STm->defaults_for_writes = 0;
|
||
STm->do_async_writes = ST_ASYNC_WRITES;
|
||
STm->do_buffer_writes = ST_BUFFER_WRITES;
|
||
STm->do_read_ahead = ST_READ_AHEAD;
|
||
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++) {
|
||
STps = &(tpnt->ps[i]);
|
||
STps->rw = ST_IDLE;
|
||
STps->eof = ST_NOEOF;
|
||
STps->at_sm = 0;
|
||
STps->last_block_valid = 0;
|
||
STps->drv_block = (-1);
|
||
STps->drv_file = (-1);
|
||
}
|
||
|
||
tpnt->current_mode = 0;
|
||
tpnt->modes[0].defined = 1;
|
||
|
||
tpnt->density_changed = tpnt->compression_changed =
|
||
tpnt->blksize_changed = 0;
|
||
mutex_init(&tpnt->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);
|
||
tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL);
|
||
if (tpnt->stats == NULL) {
|
||
sdev_printk(KERN_ERR, SDp,
|
||
"st: Can't allocate statistics.\n");
|
||
goto out_idr_remove;
|
||
}
|
||
|
||
dev_set_drvdata(dev, tpnt);
|
||
|
||
|
||
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));
|
||
sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n",
|
||
tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
|
||
queue_dma_alignment(SDp->request_queue) + 1);
|
||
|
||
return 0;
|
||
|
||
out_remove_devs:
|
||
remove_cdevs(tpnt);
|
||
kfree(tpnt->stats);
|
||
out_idr_remove:
|
||
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);
|
||
out_buffer_free:
|
||
kfree(buffer);
|
||
out:
|
||
scsi_autopm_put_device(SDp);
|
||
return -ENODEV;
|
||
};
|
||
|
||
|
||
static int st_remove(struct device *dev)
|
||
{
|
||
struct scsi_tape *tpnt = dev_get_drvdata(dev);
|
||
int index = tpnt->index;
|
||
|
||
scsi_autopm_get_device(to_scsi_device(dev));
|
||
remove_cdevs(tpnt);
|
||
|
||
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;
|
||
}
|
||
|
||
/**
|
||
* scsi_tape_release - Called to free the Scsi_Tape structure
|
||
* @kref: pointer to embedded kref
|
||
*
|
||
* st_ref_mutex must be held entering this routine. Because it is
|
||
* called on last put, you should always use the scsi_tape_get()
|
||
* scsi_tape_put() helpers which manipulate the semaphore directly
|
||
* and never do a direct kref_put().
|
||
**/
|
||
static void scsi_tape_release(struct kref *kref)
|
||
{
|
||
struct scsi_tape *tpnt = to_scsi_tape(kref);
|
||
struct gendisk *disk = tpnt->disk;
|
||
|
||
tpnt->device = NULL;
|
||
|
||
if (tpnt->buffer) {
|
||
normalize_buffer(tpnt->buffer);
|
||
kfree(tpnt->buffer->reserved_pages);
|
||
kfree(tpnt->buffer);
|
||
}
|
||
|
||
disk->private_data = NULL;
|
||
put_disk(disk);
|
||
kfree(tpnt->stats);
|
||
kfree(tpnt);
|
||
return;
|
||
}
|
||
|
||
static struct class st_sysfs_class = {
|
||
.name = "scsi_tape",
|
||
.dev_groups = st_dev_groups,
|
||
};
|
||
|
||
static int __init init_st(void)
|
||
{
|
||
int err;
|
||
|
||
validate_options();
|
||
|
||
printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
|
||
verstr, st_fixed_buffer_size, st_max_sg_segs);
|
||
|
||
debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG;
|
||
if (debugging) {
|
||
printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n",
|
||
debugging);
|
||
}
|
||
|
||
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),
|
||
ST_MAX_TAPE_ENTRIES, "st");
|
||
if (err) {
|
||
printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
|
||
SCSI_TAPE_MAJOR);
|
||
goto err_class;
|
||
}
|
||
|
||
err = scsi_register_driver(&st_template.gendrv);
|
||
if (err)
|
||
goto err_chrdev;
|
||
|
||
return 0;
|
||
|
||
err_chrdev:
|
||
unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
|
||
ST_MAX_TAPE_ENTRIES);
|
||
err_class:
|
||
class_unregister(&st_sysfs_class);
|
||
return err;
|
||
}
|
||
|
||
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_unregister(&st_sysfs_class);
|
||
idr_destroy(&st_index_idr);
|
||
printk(KERN_INFO "st: Unloaded.\n");
|
||
}
|
||
|
||
module_init(init_st);
|
||
module_exit(exit_st);
|
||
|
||
|
||
/* The sysfs driver interface. Read-only at the moment */
|
||
static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf)
|
||
{
|
||
return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io);
|
||
}
|
||
static DRIVER_ATTR_RO(try_direct_io);
|
||
|
||
static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf)
|
||
{
|
||
return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size);
|
||
}
|
||
static DRIVER_ATTR_RO(fixed_buffer_size);
|
||
|
||
static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf)
|
||
{
|
||
return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs);
|
||
}
|
||
static DRIVER_ATTR_RO(max_sg_segs);
|
||
|
||
static ssize_t version_show(struct device_driver *ddd, char *buf)
|
||
{
|
||
return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr);
|
||
}
|
||
static DRIVER_ATTR_RO(version);
|
||
|
||
#if DEBUG
|
||
static ssize_t debug_flag_store(struct device_driver *ddp,
|
||
const char *buf, size_t count)
|
||
{
|
||
/* We only care what the first byte of the data is the rest is unused.
|
||
* if it's a '1' we turn on debug and if it's a '0' we disable it. All
|
||
* other values have -EINVAL returned if they are passed in.
|
||
*/
|
||
if (count > 0) {
|
||
if (buf[0] == '0') {
|
||
debugging = NO_DEBUG;
|
||
return count;
|
||
} else if (buf[0] == '1') {
|
||
debugging = 1;
|
||
return count;
|
||
}
|
||
}
|
||
return -EINVAL;
|
||
}
|
||
|
||
static ssize_t debug_flag_show(struct device_driver *ddp, char *buf)
|
||
{
|
||
return scnprintf(buf, PAGE_SIZE, "%d\n", debugging);
|
||
}
|
||
static DRIVER_ATTR_RW(debug_flag);
|
||
#endif
|
||
|
||
static struct attribute *st_drv_attrs[] = {
|
||
&driver_attr_try_direct_io.attr,
|
||
&driver_attr_fixed_buffer_size.attr,
|
||
&driver_attr_max_sg_segs.attr,
|
||
&driver_attr_version.attr,
|
||
#if DEBUG
|
||
&driver_attr_debug_flag.attr,
|
||
#endif
|
||
NULL,
|
||
};
|
||
ATTRIBUTE_GROUPS(st_drv);
|
||
|
||
/* The sysfs simple class interface */
|
||
static ssize_t
|
||
defined_show(struct device *dev, struct device_attribute *attr, char *buf)
|
||
{
|
||
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);
|
||
|
||
static ssize_t
|
||
default_blksize_show(struct device *dev, struct device_attribute *attr,
|
||
char *buf)
|
||
{
|
||
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);
|
||
|
||
static ssize_t
|
||
default_density_show(struct device *dev, struct device_attribute *attr,
|
||
char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
ssize_t l = 0;
|
||
char *fmt;
|
||
|
||
fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n";
|
||
l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density);
|
||
return l;
|
||
}
|
||
static DEVICE_ATTR_RO(default_density);
|
||
|
||
static ssize_t
|
||
default_compression_show(struct device *dev, struct device_attribute *attr,
|
||
char *buf)
|
||
{
|
||
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);
|
||
|
||
static ssize_t
|
||
options_show(struct device *dev, struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
struct scsi_tape *STp = STm->tape;
|
||
int options;
|
||
ssize_t l = 0;
|
||
|
||
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);
|
||
|
||
/* Support for tape stats */
|
||
|
||
/**
|
||
* read_cnt_show - return read count - count of reads made from tape drive
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t read_cnt_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->read_cnt));
|
||
}
|
||
static DEVICE_ATTR_RO(read_cnt);
|
||
|
||
/**
|
||
* read_byte_cnt_show - return read byte count - tape drives
|
||
* may use blocks less than 512 bytes this gives the raw byte count of
|
||
* of data read from the tape drive.
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t read_byte_cnt_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->read_byte_cnt));
|
||
}
|
||
static DEVICE_ATTR_RO(read_byte_cnt);
|
||
|
||
/**
|
||
* read_ns_show - return read ns - overall time spent waiting on reads in ns.
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t read_ns_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->tot_read_time));
|
||
}
|
||
static DEVICE_ATTR_RO(read_ns);
|
||
|
||
/**
|
||
* write_cnt_show - write count - number of user calls
|
||
* to write(2) that have written data to tape.
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t write_cnt_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->write_cnt));
|
||
}
|
||
static DEVICE_ATTR_RO(write_cnt);
|
||
|
||
/**
|
||
* write_byte_cnt_show - write byte count - raw count of
|
||
* bytes written to tape.
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t write_byte_cnt_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->write_byte_cnt));
|
||
}
|
||
static DEVICE_ATTR_RO(write_byte_cnt);
|
||
|
||
/**
|
||
* write_ns_show - write ns - number of nanoseconds waiting on write
|
||
* requests to complete.
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t write_ns_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->tot_write_time));
|
||
}
|
||
static DEVICE_ATTR_RO(write_ns);
|
||
|
||
/**
|
||
* in_flight_show - number of I/Os currently in flight -
|
||
* in most cases this will be either 0 or 1. It may be higher if someone
|
||
* has also issued other SCSI commands such as via an ioctl.
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t in_flight_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->in_flight));
|
||
}
|
||
static DEVICE_ATTR_RO(in_flight);
|
||
|
||
/**
|
||
* io_ns_show - io wait ns - this is the number of ns spent
|
||
* waiting on all I/O to complete. This includes tape movement commands
|
||
* such as rewinding, seeking to end of file or tape, it also includes
|
||
* read and write. To determine the time spent on tape movement
|
||
* subtract the read and write ns from this value.
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t io_ns_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->tot_io_time));
|
||
}
|
||
static DEVICE_ATTR_RO(io_ns);
|
||
|
||
/**
|
||
* other_cnt_show - other io count - this is the number of
|
||
* I/O requests other than read and write requests.
|
||
* Typically these are tape movement requests but will include driver
|
||
* tape movement. This includes only requests issued by the st driver.
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t other_cnt_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->other_cnt));
|
||
}
|
||
static DEVICE_ATTR_RO(other_cnt);
|
||
|
||
/**
|
||
* resid_cnt_show - A count of the number of times we get a residual
|
||
* count - this should indicate someone issuing reads larger than the
|
||
* block size on tape.
|
||
* @dev: struct device
|
||
* @attr: attribute structure
|
||
* @buf: buffer to return formatted data in
|
||
*/
|
||
static ssize_t resid_cnt_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf)
|
||
{
|
||
struct st_modedef *STm = dev_get_drvdata(dev);
|
||
|
||
return sprintf(buf, "%lld",
|
||
(long long)atomic64_read(&STm->tape->stats->resid_cnt));
|
||
}
|
||
static DEVICE_ATTR_RO(resid_cnt);
|
||
|
||
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,
|
||
};
|
||
|
||
static struct attribute *st_stats_attrs[] = {
|
||
&dev_attr_read_cnt.attr,
|
||
&dev_attr_read_byte_cnt.attr,
|
||
&dev_attr_read_ns.attr,
|
||
&dev_attr_write_cnt.attr,
|
||
&dev_attr_write_byte_cnt.attr,
|
||
&dev_attr_write_ns.attr,
|
||
&dev_attr_in_flight.attr,
|
||
&dev_attr_io_ns.attr,
|
||
&dev_attr_other_cnt.attr,
|
||
&dev_attr_resid_cnt.attr,
|
||
NULL,
|
||
};
|
||
|
||
static struct attribute_group stats_group = {
|
||
.name = "stats",
|
||
.attrs = st_stats_attrs,
|
||
};
|
||
|
||
static struct attribute_group st_group = {
|
||
.attrs = st_dev_attrs,
|
||
};
|
||
|
||
static const struct attribute_group *st_dev_groups[] = {
|
||
&st_group,
|
||
&stats_group,
|
||
NULL,
|
||
};
|
||
|
||
/* The following functions may be useful for a larger audience. */
|
||
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)
|
||
return -EINVAL;
|
||
|
||
/* Too big */
|
||
if (nr_pages > max_pages)
|
||
return -ENOMEM;
|
||
|
||
/* Hmm? */
|
||
if (count == 0)
|
||
return 0;
|
||
|
||
pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL);
|
||
if (pages == NULL)
|
||
return -ENOMEM;
|
||
|
||
/* Try to fault in all of the necessary pages */
|
||
/* rw==READ means read from drive, write into memory area */
|
||
res = get_user_pages_fast(uaddr, nr_pages, rw == READ, pages);
|
||
|
||
/* Errors and no page mapped should return here */
|
||
if (res < nr_pages)
|
||
goto out_unmap;
|
||
|
||
for (i=0; i < nr_pages; i++) {
|
||
/* FIXME: flush superflous for rw==READ,
|
||
* probably wrong function for rw==WRITE
|
||
*/
|
||
flush_dcache_page(pages[i]);
|
||
}
|
||
|
||
mdata->offset = uaddr & ~PAGE_MASK;
|
||
STbp->mapped_pages = pages;
|
||
|
||
return nr_pages;
|
||
out_unmap:
|
||
if (res > 0) {
|
||
for (j=0; j < res; j++)
|
||
put_page(pages[j]);
|
||
res = 0;
|
||
}
|
||
kfree(pages);
|
||
return res;
|
||
}
|
||
|
||
|
||
/* And unmap them... */
|
||
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 = STbp->mapped_pages[i];
|
||
|
||
if (dirtied)
|
||
SetPageDirty(page);
|
||
/* FIXME: cache flush missing for rw==READ
|
||
* FIXME: call the correct reference counting function
|
||
*/
|
||
put_page(page);
|
||
}
|
||
kfree(STbp->mapped_pages);
|
||
STbp->mapped_pages = NULL;
|
||
|
||
return 0;
|
||
}
|