diff options
Diffstat (limited to 'drivers/scsi/st.c')
| -rw-r--r-- | drivers/scsi/st.c | 4610 |
1 files changed, 4610 insertions, 0 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c new file mode 100644 index 000000000..9a1c34205 --- /dev/null +++ b/drivers/scsi/st.c @@ -0,0 +1,4610 @@ +/* + SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying + file Documentation/scsi/st.txt for more information. + + History: + Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. + Contribution and ideas from several people including (in alphabetical + order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, + Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, + Michael Schaefer, J"org Weule, and Eric Youngdale. + + Copyright 1992 - 2010 Kai Makisara + email Kai.Makisara@kolumbus.fi + + Some small formal changes - aeb, 950809 + + Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support + */ + +static const char *verstr = "20101219"; + +#include <linux/module.h> + +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/mtio.h> +#include <linux/cdrom.h> +#include <linux/ioctl.h> +#include <linux/fcntl.h> +#include <linux/spinlock.h> +#include <linux/blkdev.h> +#include <linux/moduleparam.h> +#include <linux/cdev.h> +#include <linux/idr.h> +#include <linux/delay.h> +#include <linux/mutex.h> + +#include <asm/uaccess.h> +#include <asm/dma.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_dbg.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_driver.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/sg.h> + + +/* The driver prints some debugging information on the console if DEBUG + is defined and non-zero. */ +#define DEBUG 1 +#define NO_DEBUG 0 + +#define ST_DEB_MSG KERN_NOTICE +#if DEBUG +/* The message level for the debug messages is currently set to KERN_NOTICE + so that people can easily see the messages. Later when the debugging messages + in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ +#define DEB(a) a +#define DEBC(a) if (debugging) { a ; } +#else +#define DEB(a) +#define DEBC(a) +#endif + +#define ST_KILOBYTE 1024 + +#include "st_options.h" +#include "st.h" + +static int buffer_kbs; +static int max_sg_segs; +static int try_direct_io = TRY_DIRECT_IO; +static int try_rdio = 1; +static int try_wdio = 1; +static int debug_flag; + +static struct class st_sysfs_class; +static const struct attribute_group *st_dev_groups[]; + +MODULE_AUTHOR("Kai Makisara"); +MODULE_DESCRIPTION("SCSI tape (st) driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); +MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); + +/* Set 'perm' (4th argument) to 0 to disable module_param's definition + * of sysfs parameters (which module_param doesn't yet support). + * Sysfs parameters defined explicitly later. + */ +module_param_named(buffer_kbs, buffer_kbs, int, 0); +MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); +module_param_named(max_sg_segs, max_sg_segs, int, 0); +MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); +module_param_named(try_direct_io, try_direct_io, int, 0); +MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); +module_param_named(debug_flag, debug_flag, int, 0); +MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); + + +/* Extra parameters for testing */ +module_param_named(try_rdio, try_rdio, int, 0); +MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); +module_param_named(try_wdio, try_wdio, int, 0); +MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); + +#ifndef MODULE +static int write_threshold_kbs; /* retained for compatibility */ +static struct st_dev_parm { + char *name; + int *val; +} parms[] __initdata = { + { + "buffer_kbs", &buffer_kbs + }, + { /* Retained for compatibility with 2.4 */ + "write_threshold_kbs", &write_threshold_kbs + }, + { + "max_sg_segs", NULL + }, + { + "try_direct_io", &try_direct_io + }, + { + "debug_flag", &debug_flag + } +}; +#endif + +/* Restrict the number of modes so that names for all are assigned */ +#if ST_NBR_MODES > 16 +#error "Maximum number of modes is 16" +#endif +/* Bit reversed order to get same names for same minors with all + mode counts */ +static const char *st_formats[] = { + "", "r", "k", "s", "l", "t", "o", "u", + "m", "v", "p", "x", "a", "y", "q", "z"}; + +/* The default definitions have been moved to st_options.h */ + +#define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) + +/* The buffer size should fit into the 24 bits for length in the + 6-byte SCSI read and write commands. */ +#if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) +#error "Buffer size should not exceed (2 << 24 - 1) bytes!" +#endif + +static int debugging = DEBUG; + +#define MAX_RETRIES 0 +#define MAX_WRITE_RETRIES 0 +#define MAX_READY_RETRIES 0 +#define NO_TAPE NOT_READY + +#define ST_TIMEOUT (900 * HZ) +#define ST_LONG_TIMEOUT (14000 * HZ) + +/* Remove mode bits and auto-rewind bit (7) */ +#define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ + (iminor(x) & ~(-1 << ST_MODE_SHIFT)) ) +#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) + +/* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ +#define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ + (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) + +/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower + 24 bits) */ +#define SET_DENS_AND_BLK 0x10001 + +static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; +static int st_max_sg_segs = ST_MAX_SG; + +static int modes_defined; + +static int enlarge_buffer(struct st_buffer *, int, int); +static void clear_buffer(struct st_buffer *); +static void normalize_buffer(struct st_buffer *); +static int append_to_buffer(const char __user *, struct st_buffer *, int); +static int from_buffer(struct st_buffer *, char __user *, int); +static void move_buffer_data(struct st_buffer *, int); + +static int sgl_map_user_pages(struct st_buffer *, const unsigned int, + unsigned long, size_t, int); +static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); + +static int st_probe(struct device *); +static int st_remove(struct device *); + +static int do_create_sysfs_files(void); +static void do_remove_sysfs_files(void); + +static struct scsi_driver st_template = { + .gendrv = { + .name = "st", + .owner = THIS_MODULE, + .probe = st_probe, + .remove = st_remove, + }, +}; + +static int st_compression(struct scsi_tape *, int); + +static int find_partition(struct scsi_tape *); +static int switch_partition(struct scsi_tape *); + +static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); + +static void scsi_tape_release(struct kref *); + +#define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) + +static DEFINE_MUTEX(st_ref_mutex); +static DEFINE_SPINLOCK(st_index_lock); +static DEFINE_SPINLOCK(st_use_lock); +static DEFINE_IDR(st_index_idr); + + + +#include "osst_detect.h" +#ifndef SIGS_FROM_OSST +#define SIGS_FROM_OSST \ + {"OnStream", "SC-", "", "osst"}, \ + {"OnStream", "DI-", "", "osst"}, \ + {"OnStream", "DP-", "", "osst"}, \ + {"OnStream", "USB", "", "osst"}, \ + {"OnStream", "FW-", "", "osst"} +#endif + +static struct scsi_tape *scsi_tape_get(int dev) +{ + struct scsi_tape *STp = NULL; + + mutex_lock(&st_ref_mutex); + spin_lock(&st_index_lock); + + STp = idr_find(&st_index_idr, dev); + if (!STp) goto out; + + kref_get(&STp->kref); + + if (!STp->device) + goto out_put; + + if (scsi_device_get(STp->device)) + goto out_put; + + goto out; + +out_put: + kref_put(&STp->kref, scsi_tape_release); + STp = NULL; +out: + spin_unlock(&st_index_lock); + mutex_unlock(&st_ref_mutex); + return STp; +} + +static void scsi_tape_put(struct scsi_tape *STp) +{ + struct scsi_device *sdev = STp->device; + + mutex_lock(&st_ref_mutex); + kref_put(&STp->kref, scsi_tape_release); + scsi_device_put(sdev); + mutex_unlock(&st_ref_mutex); +} + +struct st_reject_data { + char *vendor; + char *model; + char *rev; + char *driver_hint; /* Name of the correct driver, NULL if unknown */ +}; + +static struct st_reject_data reject_list[] = { + /* {"XXX", "Yy-", "", NULL}, example */ + SIGS_FROM_OSST, + {NULL, }}; + +/* If the device signature is on the list of incompatible drives, the + function returns a pointer to the name of the correct driver (if known) */ +static char * st_incompatible(struct scsi_device* SDp) +{ + struct st_reject_data *rp; + + for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) + if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && + !strncmp(rp->model, SDp->model, strlen(rp->model)) && + !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { + if (rp->driver_hint) + return rp->driver_hint; + else + return "unknown"; + } + return NULL; +} + + +static inline char *tape_name(struct scsi_tape *tape) +{ + return tape->disk->disk_name; +} + +#define st_printk(prefix, t, fmt, a...) \ + sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) +#ifdef DEBUG +#define DEBC_printk(t, fmt, a...) \ + if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } +#else +#define DEBC_printk(t, fmt, a...) +#endif + +static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) +{ + const u8 *ucp; + const u8 *sense = SRpnt->sense; + + s->have_sense = scsi_normalize_sense(SRpnt->sense, + SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); + s->flags = 0; + + if (s->have_sense) { + s->deferred = 0; + s->remainder_valid = + scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); + switch (sense[0] & 0x7f) { + case 0x71: + s->deferred = 1; + case 0x70: + s->fixed_format = 1; + s->flags = sense[2] & 0xe0; + break; + case 0x73: + s->deferred = 1; + case 0x72: + s->fixed_format = 0; + ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); + s->flags = ucp ? (ucp[3] & 0xe0) : 0; + break; + } + } +} + + +/* Convert the result to success code */ +static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) +{ + int result = SRpnt->result; + u8 scode; + DEB(const char *stp;) + char *name = tape_name(STp); + struct st_cmdstatus *cmdstatp; + + if (!result) + return 0; + + cmdstatp = &STp->buffer->cmdstat; + st_analyze_sense(SRpnt, cmdstatp); + + if (cmdstatp->have_sense) + scode = STp->buffer->cmdstat.sense_hdr.sense_key; + else + scode = 0; + + DEB( + if (debugging) { + st_printk(ST_DEB_MSG, STp, + "Error: %x, cmd: %x %x %x %x %x %x\n", result, + SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], + SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); + if (cmdstatp->have_sense) + __scsi_print_sense(STp->device, name, + SRpnt->sense, SCSI_SENSE_BUFFERSIZE); + } ) /* end DEB */ + if (!debugging) { /* Abnormal conditions for tape */ + if (!cmdstatp->have_sense) + st_printk(KERN_WARNING, STp, + "Error %x (driver bt 0x%x, host bt 0x%x).\n", + result, driver_byte(result), host_byte(result)); + else if (cmdstatp->have_sense && + scode != NO_SENSE && + scode != RECOVERED_ERROR && + /* scode != UNIT_ATTENTION && */ + scode != BLANK_CHECK && + scode != VOLUME_OVERFLOW && + SRpnt->cmd[0] != MODE_SENSE && + SRpnt->cmd[0] != TEST_UNIT_READY) { + + __scsi_print_sense(STp->device, name, + SRpnt->sense, SCSI_SENSE_BUFFERSIZE); + } + } + + if (cmdstatp->fixed_format && + STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ + if (STp->cln_sense_value) + STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & + STp->cln_sense_mask) == STp->cln_sense_value); + else + STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & + STp->cln_sense_mask) != 0); + } + if (cmdstatp->have_sense && + 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( + 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_scsi_execute_end(struct request *req, int uptodate) +{ + struct st_request *SRpnt = req->end_io_data; + struct scsi_tape *STp = SRpnt->stp; + struct bio *tmp; + + STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors; + STp->buffer->cmdstat.residual = req->resid_len; + + tmp = SRpnt->bio; + if (SRpnt->waiting) + complete(SRpnt->waiting); + + 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 rq_map_data *mdata = &SRpnt->stp->buffer->map_data; + int err = 0; + int write = (data_direction == DMA_TO_DEVICE); + + req = blk_get_request(SRpnt->stp->device->request_queue, write, + GFP_KERNEL); + if (IS_ERR(req)) + return DRIVER_ERROR << 24; + + blk_rq_set_block_pc(req); + req->cmd_flags |= REQ_QUIET; + + mdata->null_mapped = 1; + + if (bufflen) { + err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, + GFP_KERNEL); + if (err) { + blk_put_request(req); + return DRIVER_ERROR << 24; + } + } + + SRpnt->bio = req->bio; + req->cmd_len = COMMAND_SIZE(cmd[0]); + memset(req->cmd, 0, BLK_MAX_CDB); + memcpy(req->cmd, cmd, req->cmd_len); + req->sense = SRpnt->sense; + req->sense_len = 0; + req->timeout = timeout; + req->retries = retries; + req->end_io_data = SRpnt; + + blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); + return 0; +} + +/* Do the scsi command. Waits until command performed if do_wait is true. + 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_buffer *STbuffer; + struct st_partstat *STps; + + STbuffer = STp->buffer; + + /* + * 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); + scsi_tape_put(STp); + if (resumed) + scsi_autopm_put_device(STp->device); + 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 (STp->block_size == 0 && + cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) + transfer = bytes; + + 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_MSK_PSUM_MB 0x10 + +/* 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; +} + + +/* 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. + */ +static int partition_tape(struct scsi_tape *STp, int size) +{ + int result; + int pgo, psd_cnt, psdo; + 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; + } + /* 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; + psdo = pgo + PART_PAGE_FIXED_LENGTH; + if (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS]) { + bp[psdo] = bp[psdo + 1] = 0xff; /* Rest of the tape */ + 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; + 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 " + "(1 = %d MB).\n", size); + } + bp[pgo + PP_OFF_PART_UNITS] = 0; + bp[pgo + PP_OFF_RESERVED] = 0; + bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | PP_MSK_PSUM_MB; + + result = write_mode_page(STp, PART_PAGE, 1); + if (result) { + st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); + result = (-EIO); + } + + 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; + } + if ((i = st_int_ioctl(STp, MTREW, 0)) < 0 || + (i = partition_tape(STp, mtc.mt_count)) < 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 = 1; /* Bad guess ?-) */ + 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_ATOMIC); + 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 = kzalloc(max_sg * sizeof(struct page *), + GFP_ATOMIC); + if (!tb->reserved_pages) { + kfree(tb); + return NULL; + } + + return tb; +} + + +/* Try to allocate enough space in the tape buffer */ +#define ST_MAX_ORDER 6 + +static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) +{ + int segs, 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; + + error = cdev_add(cdev, cdev_devno, 1); + if (error) { + pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, + rew ? "non" : "auto", mode); + pr_err("st%d: Device not attached.\n", dev_num); + goto out_free; + } + STm->cdevs[rew] = cdev; + + i = mode << (4 - ST_NBR_MODE_BITS); + snprintf(name, 10, "%s%s%s", rew ? "n" : "", + tape->disk->disk_name, st_formats[i]); + + dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, + cdev_devno, &tape->modes[mode], "%s", name); + if (IS_ERR(dev)) { + pr_err("st%d: device_create failed\n", dev_num); + error = PTR_ERR(dev); + goto out_free; + } + + STm->devs[rew] = dev; + + return 0; +out_free: + cdev_del(STm->cdevs[rew]); + STm->cdevs[rew] = NULL; +out: + return error; +} + +static int create_cdevs(struct scsi_tape *tape) +{ + int mode, error; + for (mode = 0; mode < ST_NBR_MODES; ++mode) { + error = create_one_cdev(tape, mode, 0); + if (error) + return error; + error = create_one_cdev(tape, mode, 1); + if (error) + return error; + } + + return sysfs_create_link(&tape->device->sdev_gendev.kobj, + &tape->modes[0].devs[0]->kobj, "tape"); +} + +static void remove_cdevs(struct scsi_tape *tape) +{ + int mode, rew; + sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); + for (mode = 0; mode < ST_NBR_MODES; mode++) { + struct st_modedef *STm = &(tape->modes[mode]); + for (rew = 0; rew < 2; rew++) { + if (STm->cdevs[rew]) + cdev_del(STm->cdevs[rew]); + if (STm->devs[rew]) + device_unregister(STm->devs[rew]); + } + } +} + +static int st_probe(struct device *dev) +{ + struct scsi_device *SDp = to_scsi_device(dev); + struct gendisk *disk = NULL; + struct 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_ATOMIC); + 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; + disk->queue = SDp->request_queue; + /* SCSI tape doesn't register this gendisk via add_disk(). Manually + * take queue reference that release_disk() expects. */ + if (!blk_get_queue(disk->queue)) + goto out_put_disk; + tpnt->driver = &st_template; + + 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); + + 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); + 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); + 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; + + err = do_create_sysfs_files(); + if (err) + goto err_scsidrv; + + return 0; + +err_scsidrv: + scsi_unregister_driver(&st_template.gendrv); +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) +{ + do_remove_sysfs_files(); + scsi_unregister_driver(&st_template.gendrv); + unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), + ST_MAX_TAPE_ENTRIES); + class_unregister(&st_sysfs_class); + 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 st_try_direct_io_show(struct device_driver *ddp, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); +} +static DRIVER_ATTR(try_direct_io, S_IRUGO, st_try_direct_io_show, NULL); + +static ssize_t st_fixed_buffer_size_show(struct device_driver *ddp, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); +} +static DRIVER_ATTR(fixed_buffer_size, S_IRUGO, st_fixed_buffer_size_show, NULL); + +static ssize_t st_max_sg_segs_show(struct device_driver *ddp, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); +} +static DRIVER_ATTR(max_sg_segs, S_IRUGO, st_max_sg_segs_show, NULL); + +static ssize_t st_version_show(struct device_driver *ddd, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "[%s]\n", verstr); +} +static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL); + +static int do_create_sysfs_files(void) +{ + struct device_driver *sysfs = &st_template.gendrv; + int err; + + err = driver_create_file(sysfs, &driver_attr_try_direct_io); + if (err) + return err; + err = driver_create_file(sysfs, &driver_attr_fixed_buffer_size); + if (err) + goto err_try_direct_io; + err = driver_create_file(sysfs, &driver_attr_max_sg_segs); + if (err) + goto err_attr_fixed_buf; + err = driver_create_file(sysfs, &driver_attr_version); + if (err) + goto err_attr_max_sg; + + return 0; + +err_attr_max_sg: + driver_remove_file(sysfs, &driver_attr_max_sg_segs); +err_attr_fixed_buf: + driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); +err_try_direct_io: + driver_remove_file(sysfs, &driver_attr_try_direct_io); + return err; +} + +static void do_remove_sysfs_files(void) +{ + struct device_driver *sysfs = &st_template.gendrv; + + driver_remove_file(sysfs, &driver_attr_version); + driver_remove_file(sysfs, &driver_attr_max_sg_segs); + driver_remove_file(sysfs, &driver_attr_fixed_buffer_size); + driver_remove_file(sysfs, &driver_attr_try_direct_io); +} + +/* 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); + +static struct attribute *st_dev_attrs[] = { + &dev_attr_defined.attr, + &dev_attr_default_blksize.attr, + &dev_attr_default_density.attr, + &dev_attr_default_compression.attr, + &dev_attr_options.attr, + NULL, +}; +ATTRIBUTE_GROUPS(st_dev); + +/* The following functions may be useful for a larger audience. */ +static int sgl_map_user_pages(struct 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; + + if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_KERNEL)) == 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_unlocked( + current, + current->mm, + uaddr, + nr_pages, + rw == READ, + 0, /* don't force */ + 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++) + page_cache_release(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 + */ + page_cache_release(page); + } + kfree(STbp->mapped_pages); + STbp->mapped_pages = NULL; + + return 0; +} |