| /* |
| 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 - 2005 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 char *verstr = "20050830"; |
| |
| #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/errno.h> |
| #include <linux/mtio.h> |
| #include <linux/cdrom.h> |
| #include <linux/ioctl.h> |
| #include <linux/fcntl.h> |
| #include <linux/spinlock.h> |
| #include <linux/blkdev.h> |
| #include <linux/moduleparam.h> |
| #include <linux/devfs_fs_kernel.h> |
| #include <linux/cdev.h> |
| #include <linux/delay.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/dma.h> |
| #include <asm/system.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/scsi_request.h> |
| #include <scsi/sg.h> |
| |
| |
| /* The driver prints some debugging information on the console if DEBUG |
| is defined and non-zero. */ |
| #define DEBUG 0 |
| |
| #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 ST_DEB_MSG KERN_NOTICE |
| #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 st_dev_max; |
| static int st_nr_dev; |
| |
| static struct class *st_sysfs_class; |
| |
| MODULE_AUTHOR("Kai Makisara"); |
| MODULE_DESCRIPTION("SCSI Tape Driver"); |
| MODULE_LICENSE("GPL"); |
| |
| /* 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)"); |
| |
| /* 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 |
| } |
| }; |
| #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 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 DEFINE_RWLOCK(st_dev_arr_lock); |
| |
| static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; |
| static int st_max_sg_segs = ST_MAX_SG; |
| |
| static struct scsi_tape **scsi_tapes = NULL; |
| |
| static int modes_defined; |
| |
| static struct st_buffer *new_tape_buffer(int, int, int); |
| static int enlarge_buffer(struct st_buffer *, int, int); |
| static void normalize_buffer(struct st_buffer *); |
| static int append_to_buffer(const char __user *, struct st_buffer *, int); |
| static int from_buffer(struct st_buffer *, char __user *, int); |
| static void move_buffer_data(struct st_buffer *, int); |
| static void buf_to_sg(struct st_buffer *, unsigned int); |
| |
| static int st_map_user_pages(struct scatterlist *, const unsigned int, |
| unsigned long, size_t, int, unsigned long); |
| static int sgl_map_user_pages(struct scatterlist *, const unsigned int, |
| unsigned long, size_t, int); |
| static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int); |
| |
| static int st_probe(struct device *); |
| static int st_remove(struct device *); |
| static int st_init_command(struct scsi_cmnd *); |
| |
| static void do_create_driverfs_files(void); |
| static void do_remove_driverfs_files(void); |
| static void do_create_class_files(struct scsi_tape *, int, int); |
| |
| static struct scsi_driver st_template = { |
| .owner = THIS_MODULE, |
| .gendrv = { |
| .name = "st", |
| .probe = st_probe, |
| .remove = st_remove, |
| }, |
| .init_command = st_init_command, |
| }; |
| |
| 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 DECLARE_MUTEX(st_ref_sem); |
| |
| |
| #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; |
| |
| down(&st_ref_sem); |
| write_lock(&st_dev_arr_lock); |
| |
| if (dev < st_dev_max && scsi_tapes != NULL) |
| STp = scsi_tapes[dev]; |
| if (!STp) goto out; |
| |
| kref_get(&STp->kref); |
| |
| if (!STp->device) |
| goto out_put; |
| |
| if (scsi_device_get(STp->device)) |
| goto out_put; |
| |
| goto out; |
| |
| out_put: |
| kref_put(&STp->kref, scsi_tape_release); |
| STp = NULL; |
| out: |
| write_unlock(&st_dev_arr_lock); |
| up(&st_ref_sem); |
| return STp; |
| } |
| |
| static void scsi_tape_put(struct scsi_tape *STp) |
| { |
| struct scsi_device *sdev = STp->device; |
| |
| down(&st_ref_sem); |
| kref_put(&STp->kref, scsi_tape_release); |
| scsi_device_put(sdev); |
| up(&st_ref_sem); |
| } |
| |
| 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; |
| } |
| |
| |
| static void st_analyze_sense(struct scsi_request *SRpnt, struct st_cmdstatus *s) |
| { |
| const u8 *ucp; |
| const u8 *sense = SRpnt->sr_sense_buffer; |
| |
| s->have_sense = scsi_request_normalize_sense(SRpnt, &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 scsi_request * SRpnt) |
| { |
| int result = SRpnt->sr_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) { |
| printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x Len: %d\n", |
| name, result, |
| SRpnt->sr_cmnd[0], SRpnt->sr_cmnd[1], SRpnt->sr_cmnd[2], |
| SRpnt->sr_cmnd[3], SRpnt->sr_cmnd[4], SRpnt->sr_cmnd[5], |
| SRpnt->sr_bufflen); |
| if (cmdstatp->have_sense) |
| scsi_print_req_sense("st", SRpnt); |
| } ) /* end DEB */ |
| if (!debugging) { /* Abnormal conditions for tape */ |
| if (!cmdstatp->have_sense) |
| printk(KERN_WARNING |
| "%s: Error %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n", |
| name, result, suggestion(result), |
| driver_byte(result) & DRIVER_MASK, host_byte(result)); |
| else if (cmdstatp->have_sense && |
| scode != NO_SENSE && |
| scode != RECOVERED_ERROR && |
| /* scode != UNIT_ATTENTION && */ |
| scode != BLANK_CHECK && |
| scode != VOLUME_OVERFLOW && |
| SRpnt->sr_cmnd[0] != MODE_SENSE && |
| SRpnt->sr_cmnd[0] != TEST_UNIT_READY) { |
| printk(KERN_WARNING "%s: Error with sense data: ", name); |
| scsi_print_req_sense("st", SRpnt); |
| } |
| } |
| |
| if (cmdstatp->fixed_format && |
| STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ |
| if (STp->cln_sense_value) |
| STp->cleaning_req |= ((SRpnt->sr_sense_buffer[STp->cln_mode] & |
| STp->cln_sense_mask) == STp->cln_sense_value); |
| else |
| STp->cleaning_req |= ((SRpnt->sr_sense_buffer[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->sr_cmnd[0] != WRITE_6 |
| && SRpnt->sr_cmnd[0] != WRITE_FILEMARKS |
| #endif |
| ) { |
| STp->recover_count++; |
| STp->recover_reg++; |
| |
| DEB( |
| if (debugging) { |
| if (SRpnt->sr_cmnd[0] == READ_6) |
| stp = "read"; |
| else if (SRpnt->sr_cmnd[0] == WRITE_6) |
| stp = "write"; |
| else |
| stp = "ioctl"; |
| printk(ST_DEB_MSG "%s: Recovered %s error (%d).\n", name, stp, |
| STp->recover_count); |
| } ) /* end DEB */ |
| |
| if (cmdstatp->flags == 0) |
| return 0; |
| } |
| return (-EIO); |
| } |
| |
| |
| /* Wakeup from interrupt */ |
| static void st_sleep_done(struct scsi_cmnd * SCpnt) |
| { |
| struct scsi_tape *STp = container_of(SCpnt->request->rq_disk->private_data, |
| struct scsi_tape, driver); |
| |
| (STp->buffer)->cmdstat.midlevel_result = SCpnt->result; |
| SCpnt->request->rq_status = RQ_SCSI_DONE; |
| DEB( STp->write_pending = 0; ) |
| |
| if (SCpnt->request->waiting) |
| complete(SCpnt->request->waiting); |
| } |
| |
| /* Do the scsi command. Waits until command performed if do_wait is true. |
| Otherwise write_behind_check() is used to check that the command |
| has finished. */ |
| static struct scsi_request * |
| st_do_scsi(struct scsi_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, |
| int bytes, int direction, int timeout, int retries, int do_wait) |
| { |
| struct completion *waiting; |
| unsigned char *bp; |
| |
| /* if async, make sure there's no command outstanding */ |
| if (!do_wait && ((STp->buffer)->last_SRpnt)) { |
| printk(KERN_ERR "%s: Async command already active.\n", |
| tape_name(STp)); |
| if (signal_pending(current)) |
| (STp->buffer)->syscall_result = (-EINTR); |
| else |
| (STp->buffer)->syscall_result = (-EBUSY); |
| return NULL; |
| } |
| |
| if (SRpnt == NULL) { |
| SRpnt = scsi_allocate_request(STp->device, GFP_ATOMIC); |
| if (SRpnt == NULL) { |
| DEBC( printk(KERN_ERR "%s: Can't get SCSI request.\n", |
| tape_name(STp)); ); |
| if (signal_pending(current)) |
| (STp->buffer)->syscall_result = (-EINTR); |
| else |
| (STp->buffer)->syscall_result = (-EBUSY); |
| 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->sr_use_sg = STp->buffer->do_dio || (bytes > (STp->buffer)->frp[0].length); |
| if (SRpnt->sr_use_sg) { |
| if (!STp->buffer->do_dio) |
| buf_to_sg(STp->buffer, bytes); |
| SRpnt->sr_use_sg = (STp->buffer)->sg_segs; |
| bp = (char *) &((STp->buffer)->sg[0]); |
| } else |
| bp = (STp->buffer)->b_data; |
| SRpnt->sr_data_direction = direction; |
| SRpnt->sr_cmd_len = 0; |
| SRpnt->sr_request->waiting = waiting; |
| SRpnt->sr_request->rq_status = RQ_SCSI_BUSY; |
| SRpnt->sr_request->rq_disk = STp->disk; |
| SRpnt->sr_request->end_io = blk_end_sync_rq; |
| STp->buffer->cmdstat.have_sense = 0; |
| |
| scsi_do_req(SRpnt, (void *) cmd, bp, bytes, |
| st_sleep_done, timeout, retries); |
| |
| if (do_wait) { |
| wait_for_completion(waiting); |
| SRpnt->sr_request->waiting = NULL; |
| if (SRpnt->sr_request->rq_status != RQ_SCSI_DONE) |
| SRpnt->sr_result |= (DRIVER_ERROR << 24); |
| (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 scsi_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->sr_request->waiting = NULL; |
| if (SRpnt->sr_request->rq_status != RQ_SCSI_DONE) |
| SRpnt->sr_result |= (DRIVER_ERROR << 24); |
| |
| (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); |
| scsi_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) |
| printk(ST_DEB_MSG "%s: Async write error %x, return value %d.\n", |
| tape_name(STp), 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 scsi_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(ST_DEB_MSG "%s: Stepping over filemark %s.\n", |
| tape_name(STp), forward ? "forward" : "backward")); |
| |
| SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
| STp->device->timeout, MAX_RETRIES, 1); |
| if (!SRpnt) |
| return (STp->buffer)->syscall_result; |
| |
| scsi_release_request(SRpnt); |
| SRpnt = NULL; |
| |
| if ((STp->buffer)->cmdstat.midlevel_result != 0) |
| printk(KERN_ERR "%s: Stepping over filemark %s failed.\n", |
| tape_name(STp), forward ? "forward" : "backward"); |
| |
| return (STp->buffer)->syscall_result; |
| } |
| |
| |
| /* Flush the write buffer (never need to write if variable blocksize). */ |
| static int flush_write_buffer(struct scsi_tape * STp) |
| { |
| int offset, transfer, blks; |
| int result; |
| unsigned char cmd[MAX_COMMAND_SIZE]; |
| struct scsi_request *SRpnt; |
| struct st_partstat *STps; |
| |
| result = write_behind_check(STp); |
| if (result) |
| return result; |
| |
| result = 0; |
| if (STp->dirty == 1) { |
| |
| offset = (STp->buffer)->buffer_bytes; |
| transfer = ((offset + STp->block_size - 1) / |
| STp->block_size) * STp->block_size; |
| DEBC(printk(ST_DEB_MSG "%s: Flushing %d bytes.\n", |
| tape_name(STp), transfer)); |
| |
| memset((STp->buffer)->b_data + offset, 0, transfer - offset); |
| |
| memset(cmd, 0, MAX_COMMAND_SIZE); |
| cmd[0] = WRITE_6; |
| cmd[1] = 1; |
| 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->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 { |
| printk(KERN_ERR "%s: Error on flush.\n", |
| tape_name(STp)); |
| STps->drv_block = (-1); |
| result = (-EIO); |
| } |
| } else { |
| if (STps->drv_block >= 0) |
| STps->drv_block += blks; |
| STp->dirty = 0; |
| (STp->buffer)->buffer_bytes = 0; |
| } |
| scsi_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 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; |
| char *name = tape_name(STp); |
| |
| 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)) { |
| printk(KERN_WARNING |
| "%s: Can't set default block size to %d bytes and density %x.\n", |
| name, STm->default_blksize, STm->default_density); |
| if (modes_defined) |
| return (-EINVAL); |
| } |
| return 0; |
| } |
| |
| |
| /* Lock or unlock the drive door. Don't use when scsi_request allocated. */ |
| static int do_door_lock(struct scsi_tape * STp, int do_lock) |
| { |
| int retval, cmd; |
| DEB(char *name = tape_name(STp);) |
| |
| |
| cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK; |
| DEBC(printk(ST_DEB_MSG "%s: %socking drive door.\n", name, |
| do_lock ? "L" : "Unl")); |
| retval = scsi_ioctl(STp->device, cmd, NULL); |
| 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 scsi_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) |
| scsi_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 scsi_request *SRpnt = NULL; |
| struct st_modedef *STm; |
| struct st_partstat *STps; |
| char *name = tape_name(STp); |
| struct inode *inode = filp->f_dentry->d_inode; |
| int mode = TAPE_MODE(inode); |
| |
| STp->ready = ST_READY; |
| |
| if (mode != STp->current_mode) { |
| DEBC(printk(ST_DEB_MSG "%s: Mode change from %d to %d.\n", |
| name, 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->timeout, MAX_READY_RETRIES, 1); |
| if (!SRpnt) { |
| retval = (STp->buffer)->syscall_result; |
| goto err_out; |
| } |
| |
| if (!SRpnt->sr_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) |
| printk(KERN_WARNING |
| "%s: Block limits %d - %d bytes.\n", name, |
| STp->min_block, STp->max_block); |
| } else { |
| STp->min_block = STp->max_block = (-1); |
| DEBC(printk(ST_DEB_MSG "%s: Can't read block limits.\n", |
| name)); |
| } |
| } |
| |
| 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->timeout, MAX_READY_RETRIES, 1); |
| if (!SRpnt) { |
| retval = (STp->buffer)->syscall_result; |
| goto err_out; |
| } |
| |
| if ((STp->buffer)->syscall_result != 0) { |
| DEBC(printk(ST_DEB_MSG "%s: No Mode Sense.\n", name)); |
| STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ |
| (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ |
| STp->drv_write_prot = 0; |
| } else { |
| DEBC(printk(ST_DEB_MSG |
| "%s: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n", |
| name, |
| (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(ST_DEB_MSG |
| "%s: Density %x, tape length: %x, drv buffer: %d\n", |
| name, 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; |
| } |
| scsi_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(ST_DEB_MSG |
| "%s: Block size: %d, buffer size: %d (%d blocks).\n", name, |
| STp->block_size, (STp->buffer)->buffer_size, |
| (STp->buffer)->buffer_blocks)); |
| |
| if (STp->drv_write_prot) { |
| STp->write_prot = 1; |
| |
| DEBC(printk(ST_DEB_MSG "%s: Write protected\n", name)); |
| |
| 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(ST_DEB_MSG |
| "%s: Updating partition number in status.\n", name)); |
| 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)) |
| printk(KERN_WARNING |
| "%s: Can't set default drive buffering to %d.\n", |
| name, STp->default_drvbuffer); |
| } |
| } |
| |
| return CHKRES_READY; |
| |
| err_out: |
| return retval; |
| } |
| |
| |
| /* Open the device. Needs to be called with BKL only because of incrementing the SCSI host |
| module count. */ |
| static int st_open(struct inode *inode, struct file *filp) |
| { |
| int i, retval = (-EIO); |
| struct scsi_tape *STp; |
| struct st_partstat *STps; |
| int dev = TAPE_NR(inode); |
| char *name; |
| |
| /* |
| * 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; |
| |
| write_lock(&st_dev_arr_lock); |
| filp->private_data = STp; |
| name = tape_name(STp); |
| |
| if (STp->in_use) { |
| write_unlock(&st_dev_arr_lock); |
| scsi_tape_put(STp); |
| DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) |
| return (-EBUSY); |
| } |
| |
| STp->in_use = 1; |
| write_unlock(&st_dev_arr_lock); |
| STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; |
| |
| 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)) { |
| printk(KERN_WARNING "%s: Can't allocate one page tape buffer.\n", |
| name); |
| retval = (-EOVERFLOW); |
| goto err_out; |
| } |
| |
| (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->recover_count = 0; |
| DEB( STp->nbr_waits = STp->nbr_finished = 0; |
| STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = STp->nbr_combinable = 0; ) |
| |
| retval = check_tape(STp, filp); |
| if (retval < 0) |
| goto err_out; |
| if ((filp->f_flags & O_NONBLOCK) == 0 && |
| retval != CHKRES_READY) { |
| retval = (-EIO); |
| goto err_out; |
| } |
| return 0; |
| |
| err_out: |
| normalize_buffer(STp->buffer); |
| STp->in_use = 0; |
| scsi_tape_put(STp); |
| return retval; |
| |
| } |
| |
| |
| /* Flush the tape buffer before close */ |
| static int st_flush(struct file *filp) |
| { |
| int result = 0, result2; |
| unsigned char cmd[MAX_COMMAND_SIZE]; |
| struct scsi_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]); |
| char *name = tape_name(STp); |
| |
| if (file_count(filp) > 1) |
| return 0; |
| |
| if (STps->rw == ST_WRITING && !STp->pos_unknown) { |
| result = flush_write_buffer(STp); |
| if (result != 0 && result != (-ENOSPC)) |
| goto out; |
| } |
| |
| if (STp->can_partitions && |
| (result2 = switch_partition(STp)) < 0) { |
| DEBC(printk(ST_DEB_MSG |
| "%s: switch_partition at close failed.\n", name)); |
| if (result == 0) |
| result = result2; |
| goto out; |
| } |
| |
| DEBC( if (STp->nbr_requests) |
| printk(KERN_WARNING "%s: Number of r/w requests %d, dio used in %d, pages %d (%d).\n", |
| name, STp->nbr_requests, STp->nbr_dio, STp->nbr_pages, STp->nbr_combinable)); |
| |
| if (STps->rw == ST_WRITING && !STp->pos_unknown) { |
| struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; |
| |
| DEBC(printk(ST_DEB_MSG "%s: Async write waits %d, finished %d.\n", |
| name, STp->nbr_waits, STp->nbr_finished); |
| ) |
| |
| memset(cmd, 0, MAX_COMMAND_SIZE); |
| cmd[0] = WRITE_FILEMARKS; |
| cmd[4] = 1 + STp->two_fm; |
| |
| SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, |
| STp->device->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 */ |
| scsi_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 */ |
| scsi_release_request(SRpnt); |
| SRpnt = NULL; |
| printk(KERN_ERR "%s: Error on write filemark.\n", name); |
| if (result == 0) |
| result = (-EIO); |
| } |
| |
| DEBC(printk(ST_DEB_MSG "%s: Buffer flushed, %d EOF(s) written\n", |
| name, 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); |
| write_lock(&st_dev_arr_lock); |
| STp->in_use = 0; |
| write_unlock(&st_dev_arr_lock); |
| 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) { |
| printk(ST_DEB_MSG "%s: Incorrect device.\n", tape_name(STp)); |
| 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 && try_rdio; |
| else |
| i = STp->try_dio && try_wdio; |
| if (i && ((unsigned long)buf & queue_dma_alignment( |
| STp->device->request_queue)) == 0) { |
| i = st_map_user_pages(&(STbp->sg[0]), STbp->use_sg, |
| (unsigned long)buf, count, (is_read ? READ : WRITE), |
| STp->max_pfn); |
| 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; |
| STbp->frp_sg_current = 0; |
| DEB( |
| if (STbp->do_dio) { |
| STp->nbr_dio++; |
| STp->nbr_pages += STbp->do_dio; |
| for (i=1; i < STbp->do_dio; i++) |
| if (page_to_pfn(STbp->sg[i].page) == page_to_pfn(STbp->sg[i-1].page) + 1) |
| STp->nbr_combinable++; |
| } |
| ) |
| } 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; |
| if (bufsize > STbp->buffer_size && |
| !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { |
| printk(KERN_WARNING "%s: Can't allocate %d byte tape buffer.\n", |
| tape_name(STp), 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) |
| { |
| struct st_buffer *STbp; |
| |
| STbp = STp->buffer; |
| if (STbp->do_dio) { |
| sgl_unmap_user_pages(&(STbp->sg[0]), STbp->do_dio, 0); |
| STbp->do_dio = 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 scsi_request *SRpnt = NULL; |
| struct scsi_tape *STp = filp->private_data; |
| struct st_modedef *STm; |
| struct st_partstat *STps; |
| struct st_buffer *STbp; |
| char *name = tape_name(STp); |
| |
| if (down_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) { |
| printk(KERN_WARNING "%s: Write not multiple of tape block size.\n", |
| name); |
| 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))) { |
| printk(KERN_WARNING "%s: Can't set default compression.\n", |
| name); |
| 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 && 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->timeout, MAX_WRITE_RETRIES, !async_write); |
| if (!SRpnt) { |
| retval = STbp->syscall_result; |
| goto out; |
| } |
| if (async_write) { |
| 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(ST_DEB_MSG "%s: Error on write:\n", name)); |
| 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; |
| 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(ST_DEB_MSG |
| "%s: EOM with %d bytes unwritten.\n", |
| name, (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(ST_DEB_MSG |
| "%s: Retry write of %d bytes at EOM.\n", |
| name, 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(ST_DEB_MSG |
| "%s: EOM with lost data.\n", |
| name)); |
| } |
| } |
| } else { |
| count += do_count; |
| STps->drv_block = (-1); /* Too cautious? */ |
| retval = (-EIO); |
| } |
| |
| } |
| |
| 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) |
| scsi_release_request(SRpnt); |
| release_buffering(STp); |
| up(&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 scsi_request ** aSRpnt) |
| { |
| int transfer, blks, bytes; |
| unsigned char cmd[MAX_COMMAND_SIZE]; |
| struct scsi_request *SRpnt; |
| struct st_modedef *STm; |
| struct st_partstat *STps; |
| struct st_buffer *STbp; |
| int retval = 0; |
| char *name = tape_name(STp); |
| |
| 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 && 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); |
| cmd[2] = blks >> 16; |
| cmd[3] = blks >> 8; |
| cmd[4] = blks; |
| |
| SRpnt = *aSRpnt; |
| SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, |
| STp->device->timeout, MAX_RETRIES, 1); |
| release_buffering(STp); |
| *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(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", |
| name, |
| SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[1], |
| SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[3], |
| SRpnt->sr_sense_buffer[4], SRpnt->sr_sense_buffer[5], |
| SRpnt->sr_sense_buffer[6], SRpnt->sr_sense_buffer[7])); |
| 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) { |
| if (transfer <= 0) { |
| if (transfer < 0) |
| printk(KERN_NOTICE |
| "%s: Failed to read %d byte block with %d byte transfer.\n", |
| name, bytes - transfer, bytes); |
| if (STps->drv_block >= 0) |
| STps->drv_block += 1; |
| STbp->buffer_bytes = 0; |
| return (-ENOMEM); |
| } |
| STbp->buffer_bytes = bytes - transfer; |
| } else { |
| scsi_release_request(SRpnt); |
| SRpnt = *aSRpnt = NULL; |
| if (transfer == blks) { /* We did not get anything, error */ |
| printk(KERN_NOTICE "%s: Incorrect block size.\n", name); |
| 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(ST_DEB_MSG |
| "%s: ILI but enough data received %ld %d.\n", |
| name, 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(ST_DEB_MSG |
| "%s: EOF detected (%d bytes read).\n", |
| name, 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(ST_DEB_MSG "%s: EOM detected (%d bytes read).\n", |
| name, STbp->buffer_bytes)); |
| } |
| } |
| /* end of EOF, EOM, ILI test */ |
| else { /* nonzero sense key */ |
| DEBC(printk(ST_DEB_MSG |
| "%s: Tape error while reading.\n", name)); |
| STps->drv_block = (-1); |
| if (STps->eof == ST_FM && |
| cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { |
| DEBC(printk(ST_DEB_MSG |
| "%s: Zero returned for first BLANK CHECK after EOF.\n", |
| name)); |
| 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 (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 scsi_request *SRpnt = NULL; |
| struct scsi_tape *STp = filp->private_data; |
| struct st_modedef *STm; |
| struct st_partstat *STps; |
| struct st_buffer *STbp = STp->buffer; |
| DEB( char *name = tape_name(STp); ) |
| |
| if (down_interruptible(&STp->lock)) |
| return -ERESTARTSYS; |
| |
| retval = rw_checks(STp, filp, count); |
| if (retval || count == 0) |
| goto out; |
| |
| STm = &(STp->modes[STp->current_mode]); |
| if (!(STm->do_read_ahead) && STp->block_size != 0 && |
| (count % STp->block_size) != 0) { |
| retval = (-EINVAL); /* Read must be integral number of blocks */ |
| goto out; |
| } |
| |
| 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) |
| printk(ST_DEB_MSG "%s: EOF/EOM flag up (%d). Bytes %d\n", name, |
| 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) |
| printk(ST_DEB_MSG |
| "%s: EOF up (%d). Left %d, needed %d.\n", name, |
| 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) { |
| scsi_release_request(SRpnt); |
| SRpnt = NULL; |
| } |
| if (do_dio) { |
| release_buffering(STp); |
| STbp->buffer_bytes = 0; |
| } |
| up(&STp->lock); |
| |
| return retval; |
| } |
| |
| |
| |
| DEB( |
| /* Set the driver options */ |
| static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm, char *name) |
| { |
| if (debugging) { |
| printk(KERN_INFO |
| "%s: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", |
| name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, |
| STm->do_read_ahead); |
| printk(KERN_INFO |
| "%s: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", |
| name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); |
| printk(KERN_INFO |
| "%s: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", |
| name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, |
| STp->scsi2_logical); |
| printk(KERN_INFO |
| "%s: sysv: %d nowait: %d\n", name, STm->sysv, STp->immediate); |
| printk(KERN_INFO "%s: debugging: %d\n", |
| name, debugging); |
| } |
| } |
| ) |
| |
| |
| static int st_set_options(struct scsi_tape *STp, long options) |
| { |
| int value; |
| long code; |
| struct st_modedef *STm; |
| char *name = tape_name(STp); |
| struct cdev *cd0, *cd1; |
| |
| STm = &(STp->modes[STp->current_mode]); |
| if (!STm->defined) { |
| cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1]; |
| memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); |
| STm->cdevs[0] = cd0; STm->cdevs[1] = cd1; |
| modes_defined = 1; |
| DEBC(printk(ST_DEB_MSG |
| "%s: Initialized mode %d definition from mode 0\n", |
| name, 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; |
| STm->sysv = (options & MT_ST_SYSV) != 0; |
| DEB( debugging = (options & MT_ST_DEBUGGING) != 0; |
| st_log_options(STp, STm, name); ) |
| } 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_SYSV) != 0) |
| STm->sysv = value; |
| DEB( |
| if ((options & MT_ST_DEBUGGING) != 0) |
| debugging = value; |
| st_log_options(STp, STm, name); ) |
| } 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(KERN_INFO "%s: Default block size disabled.\n", name)); |
| } else { |
| STm->default_blksize = value; |
| DEBC( printk(KERN_INFO "%s: Default block size set to %d bytes.\n", |
| name, 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(KERN_INFO "%s: Long timeout set to %d seconds.\n", name, |
| (value & ~MT_ST_SET_LONG_TIMEOUT))); |
| } else { |
| STp->device->timeout = value * HZ; |
| DEBC( printk(KERN_INFO "%s: Normal timeout set to %d seconds.\n", |
| name, value) ); |
| } |
| } else if (code == MT_ST_SET_CLN) { |
| value = (options & ~MT_ST_OPTIONS) & 0xff; |
| if (value != 0 && |
| value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE) |
| return (-EINVAL); |
| STp->cln_mode = value; |
| STp->cln_sense_mask = (options >> 8) & 0xff; |
| STp->cln_sense_value = (options >> 16) & 0xff; |
| printk(KERN_INFO |
| "%s: Cleaning request mode %d, mask %02x, value %02x\n", |
| name, 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(KERN_INFO "%s: Density default disabled.\n", |
| name)); |
| } else { |
| STm->default_density = value & 0xff; |
| DEBC( printk(KERN_INFO "%s: Density default set to %x\n", |
| name, 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(KERN_INFO |
| "%s: Drive buffer default disabled.\n", name)); |
| } else { |
| STp->default_drvbuffer = value & 7; |
| DEBC( printk(KERN_INFO |
| "%s: Drive buffer default set to %x\n", |
| name, 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(KERN_INFO |
| "%s: Compression default disabled.\n", name)); |
| } else { |
| if ((value & 0xff00) != 0) { |
| STp->c_algo = (value & 0xff00) >> 8; |
| DEBC( printk(KERN_INFO "%s: Compression algorithm set to 0x%x.\n", |
| name, STp->c_algo)); |
| } |
| if ((value & 0xff) != 0xff) { |
| STm->default_compression = (value & 1 ? ST_YES : ST_NO); |
| DEBC( printk(KERN_INFO "%s: Compression default set to %x\n", |
| name, (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 scsi_request *SRpnt = NULL; |
| |
| 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(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, |
| STp->device->timeout, 0, 1); |
| if (SRpnt == NULL) |
| return (STp->buffer)->syscall_result; |
| |
| scsi_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 scsi_request *SRpnt = NULL; |
| |
| 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; |
| |
| SRpnt = st_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, |
| (slow ? STp->long_timeout : STp->device->timeout), 0, 1); |
| if (SRpnt == NULL) |
| return (STp->buffer)->syscall_result; |
| |
| scsi_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; |
| DEB( char *name = tape_name(STp); ) |
| |
| if (STp->ready != ST_READY) |
| return (-EIO); |
| |
| /* Read the current page contents */ |
| retval = read_mode_page(STp, COMPRESSION_PAGE, 0); |
| if (retval) { |
| DEBC(printk(ST_DEB_MSG "%s: Compression mode page not supported.\n", |
| name)); |
| return (-EIO); |
| } |
| |
| mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; |
| DEBC(printk(ST_DEB_MSG "%s: Compression state is %d.\n", name, |
| (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(ST_DEB_MSG "%s: Compression not supported.\n", name)); |
| 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(ST_DEB_MSG "%s: Compression change failed.\n", name)); |
| return (-EIO); |
| } |
| DEBC(printk(ST_DEB_MSG "%s: Compression state changed to %d.\n", |
| name, 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; |
| DEB( char *name = tape_name(STp); ) |
| unsigned char cmd[MAX_COMMAND_SIZE]; |
| struct st_partstat *STps; |
| struct scsi_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(ST_DEB_MSG "%s: Enhanced %sload slot %2d.\n", |
| name, (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->timeout; |
| } |
| else |
| timeout = STp->long_timeout; |
| |
| DEBC( |
| if (!load_code) |
| printk(ST_DEB_MSG "%s: Unloading tape.\n", name); |
| else |
| printk(ST_DEB_MSG "%s: Loading tape.\n", name); |
| ); |
| |
| 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; |
| scsi_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(char *name, int direction, char *units, unsigned char *cmd) |
| { |
| s32 sc; |
| |
| sc = cmd[2] & 0x80 ? 0xff000000 : 0; |
| sc |= (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; |
| if (direction) |
| sc = -sc; |
| printk(ST_DEB_MSG "%s: Spacing tape %s over %d %s.\n", name, |
| direction ? "backward" : "forward", sc, units); |
| } |
| #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 scsi_request *SRpnt; |
| struct st_partstat *STps; |
| int fileno, blkno, at_sm, undone; |
| int datalen = 0, direction = DMA_NONE; |
| char *name = tape_name(STp); |
| |
| 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; |
| DEBC(deb_space_print(name, 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; |
| DEBC(deb_space_print(name, 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; |
| DEBC(deb_space_print(name, 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; |
| DEBC(deb_space_print(name, 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; |
| DEBC(deb_space_print(name, 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; |
| DEBC(deb_space_print(name, ST_DEB_BACKWARD, "setmarks", cmd);) |
| if (arg != 0) { |
| blkno = fileno = (-1); |
| at_sm = 1; |
| } |
| break; |
| case MTWEOF: |
| case MTWSM: |
| if (STp->write_prot) |
| return (-EACCES); |
| cmd[0] = WRITE_FILEMARKS; |
| if (cmd_in == MTWSM) |
| cmd[1] = 2; |
| cmd[2] = (arg >> 16); |
| cmd[3] = (arg >> 8); |
| cmd[4] = arg; |
| timeout = STp->device->timeout; |
| DEBC( |
| if (cmd_in == MTWEOF) |
| printk(ST_DEB_MSG "%s: Writing %d filemarks.\n", name, |
| cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); |
| else |
| printk(ST_DEB_MSG "%s: Writing %d setmarks.\n", name, |
| 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->timeout; |
| } |
| DEBC(printk(ST_DEB_MSG "%s: Rewinding tape.\n", name)); |
| fileno = blkno = at_sm = 0; |
| break; |
| case MTNOP: |
| DEBC(printk(ST_DEB_MSG "%s: No op on tape.\n", name)); |
| 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->timeout; |
| } |
| cmd[4] = 3; |
| DEBC(printk(ST_DEB_MSG "%s: Retensioning tape.\n", name)); |
| 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(ST_DEB_MSG "%s: Spacing to end of recorded medium.\n", |
| name)); |
| 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->timeout; |
| } |
| else |
| timeout = STp->long_timeout * 8; |
| |
| DEBC(printk(ST_DEB_MSG "%s: Erasing tape.\n", name)); |
| 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)) { |
| printk(KERN_WARNING "%s: Illegal block size.\n", name); |
| 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->timeout; |
| DEBC( |
| if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) |
| printk(ST_DEB_MSG |
| "%s: Setting block size to %d bytes.\n", name, |
| (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) |
| printk(ST_DEB_MSG |
| "%s: Setting density code to %x.\n", name, |
| (STp->buffer)->b_data[4]); |
| if (cmd_in == MTSETDRVBUFFER) |
| printk(ST_DEB_MSG |
| "%s: Setting drive buffer code to %d.\n", name, |
| ((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 */ |
| scsi_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) { |
| int old_block_size = STp->block_size; |
| STp->block_size = arg & MT_ST_BLKSIZE_MASK; |
| if (STp->block_size != 0) { |
| if (old_block_size == 0) |
| normalize_buffer(STp->buffer); |
| (STp->buffer)->buffer_blocks = |
| (STp->buffer)->buffer_size / STp->block_size; |
| } |
| (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) |
| STps->rw = ST_IDLE; |
| } 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 && |
| cmdstatp->have_sense && |
| (cmdstatp->flags & SENSE_EOM) && |
| (cmdstatp->sense_hdr.sense_key == NO_SENSE || |
| cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && |
| undone == 0) { |
| ioctl_result = 0; /* EOF written succesfully at EOM */ |
| if (fileno >= 0) |
| fileno++; |
| STps->drv_file = fileno; |
| STps->eof = ST_NOEOF; |
| } 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 | PF_TESTED; |
| scsi_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; |
| |
| scsi_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 scsi_request *SRpnt; |
| DEB( char *name = tape_name(STp); ) |
| |
| 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->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(ST_DEB_MSG "%s: Can't read tape position.\n", name)); |
| 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(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name, |
| *block, *partition)); |
| } |
| scsi_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 scsi_request *SRpnt; |
| DEB( char *name = tape_name(STp); ) |
| |
| if (STp->ready != ST_READY) |
| return (-EIO); |
| timeout = STp->long_timeout; |
| STps = &(STp->ps[STp->partition]); |
| |
| DEBC(printk(ST_DEB_MSG "%s: Setting block to %d and partition to %d.\n", |
| name, 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(ST_DEB_MSG |
| "%s: Visited block %d for partition %d saved.\n", |
| name, 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(ST_DEB_MSG |
| "%s: Trying to change partition from %d to %d\n", |
| name, STp->partition, partition)); |
| } |
| } |
| if (STp->immediate) { |
| scmd[1] |= 1; /* Don't wait for completion */ |
| timeout = STp->device->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; |
| } |
| |
| scsi_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; |
| DEB( char *name = tape_name(STp); ) |
| |
| if (STp->ready != ST_READY) |
| return (-EIO); |
| |
| result = read_mode_page(STp, PART_PAGE, 1); |
| |
| if (result) { |
| DEBC(printk(ST_DEB_MSG "%s: Can't read medium partition page.\n", |
| name)); |
| result = (-EIO); |
| } else { |
| result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + |
| PP_OFF_NBR_ADD_PARTS] + 1; |
| DEBC(printk(ST_DEB_MSG "%s: Number of partitions %d.\n", name, 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) |
| { |
| char *name = tape_name(STp); |
| int result; |
| int pgo, psd_cnt, psdo; |
| unsigned char *bp; |
| |
| result = read_mode_page(STp, PART_PAGE, 0); |
| if (result) { |
| DEBC(printk(ST_DEB_MSG "%s: Can't read partition mode page.\n", name)); |
| 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(ST_DEB_MSG "%s: Partition page length is %d bytes.\n", |
| name, 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("%s: psd_cnt %d, max.parts %d, nbr_parts %d\n", name, |
| 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(ST_DEB_MSG "%s: Formatting tape with one partition.\n", |
| name)); |
| } 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(ST_DEB_MSG |
| "%s: Formatting tape with two partitions (1 = %d MB).\n", |
| name, 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) { |
| printk(KERN_INFO "%s: Partitioning of tape failed.\n", name); |
| result = (-EIO); |
| } |
| |
| return result; |
| } |
| |
| |
| |
| /* The ioctl command */ |
| static int st_ioctl(struct inode *inode, 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; |
| char *name = tape_name(STp); |
| void __user *p = (void __user *)arg; |
| |
| if (down_interruptible(&STp->lock)) |
| return -ERESTARTSYS; |
| |
| DEB( |
| if (debugging && !STp->in_use) { |
| printk(ST_DEB_MSG "%s: Incorrect device.\n", name); |
| 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_nonblockable_ioctl(STp->device, cmd_in, p, file); |
| if (!scsi_block_when_processing_errors(STp->device) || retval != -ENODEV) |
| goto out; |
| retval = 0; |
| |
| 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)) { |
| printk(KERN_WARNING |
| "%s: MTSETDRVBUFFER only allowed for root.\n", name); |
| 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; |
| } |
| up(&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(file, STp->disk, 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: |
| up(&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 from_initialization, int need_dma, int max_sg) |
| { |
| int i, got = 0, segs = 0; |
| gfp_t priority; |
| struct st_buffer *tb; |
| |
| if (from_initialization) |
| priority = GFP_ATOMIC; |
| else |
| priority = GFP_KERNEL; |
| |
| i = sizeof(struct st_buffer) + (max_sg - 1) * sizeof(struct scatterlist) + |
| max_sg * sizeof(struct st_buf_fragment); |
| tb = kmalloc(i, priority); |
| if (!tb) { |
| printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); |
| return NULL; |
| } |
| memset(tb, 0, i); |
| tb->frp_segs = tb->orig_frp_segs = segs; |
| tb->use_sg = max_sg; |
| if (segs > 0) |
| tb->b_data = page_address(tb->sg[0].page); |
| tb->frp = (struct st_buf_fragment *)(&(tb->sg[0]) + max_sg); |
| |
| tb->in_use = 1; |
| tb->dma = need_dma; |
| tb->buffer_size = got; |
| |
| return tb; |
| } |
| |
| |
| /* Try to allocate enough space in the tape buffer */ |
| static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) |
| { |
| int segs, nbr, max_segs, b_size, 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; |
| nbr = max_segs - STbuffer->frp_segs; |
| if (nbr <= 0) |
| return 0; |
| |
| priority = GFP_KERNEL | __GFP_NOWARN; |
| if (need_dma) |
| priority |= GFP_DMA; |
| for (b_size = PAGE_SIZE, order=0; |
| b_size < new_size - STbuffer->buffer_size; |
| order++, b_size *= 2) |
| ; /* empty */ |
| |
| for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; |
| segs < max_segs && got < new_size;) { |
| STbuffer->frp[segs].page = alloc_pages(priority, order); |
| if (STbuffer->frp[segs].page == NULL) { |
| if (new_size - got <= (max_segs - segs) * b_size / 2) { |
| b_size /= 2; /* Large enough for the rest of the buffers */ |
| order--; |
| continue; |
| } |
| DEB(STbuffer->buffer_size = got); |
| normalize_buffer(STbuffer); |
| return 0; |
| } |
| STbuffer->frp[segs].length = b_size; |
| STbuffer->frp_segs += 1; |
| got += b_size; |
| STbuffer->buffer_size = got; |
| segs++; |
| } |
| STbuffer->b_data = page_address(STbuffer->frp[0].page); |
| |
| return 1; |
| } |
| |
| |
| /* Release the extra buffer */ |
| static void normalize_buffer(struct st_buffer * STbuffer) |
| { |
| int i, order; |
| |
| for (i = STbuffer->orig_frp_segs; i < STbuffer->frp_segs; i++) { |
| order = get_order(STbuffer->frp[i].length); |
| __free_pages(STbuffer->frp[i].page, order); |
| STbuffer->buffer_size -= STbuffer->frp[i].length; |
| } |
| STbuffer->frp_segs = STbuffer->orig_frp_segs; |
| STbuffer->frp_sg_current = 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; |
| |
| for (i = 0, offset = st_bp->buffer_bytes; |
| i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++) |
| offset -= st_bp->frp[i].length; |
| if (i == st_bp->frp_segs) { /* Should never happen */ |
| printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); |
| return (-EIO); |
| } |
| for (; i < st_bp->frp_segs && do_count > 0; i++) { |
| cnt = st_bp->frp[i].length - offset < do_count ? |
| st_bp->frp[i].length - offset : do_count; |
| res = copy_from_user(page_address(st_bp->frp[i].page) + offset, ubp, cnt); |
| 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; |
| |
| for (i = 0, offset = st_bp->read_pointer; |
| i < st_bp->frp_segs && offset >= st_bp->frp[i].length; i++) |
| offset -= st_bp->frp[i].length; |
| if (i == st_bp->frp_segs) { /* Should never happen */ |
| printk(KERN_WARNING "st: from_buffer offset overflow.\n"); |
| return (-EIO); |
| } |
| for (; i < st_bp->frp_segs && do_count > 0; i++) { |
| cnt = st_bp->frp[i].length - offset < do_count ? |
| st_bp->frp[i].length - offset : do_count; |
| res = copy_to_user(ubp, page_address(st_bp->frp[i].page) + offset, cnt); |
| 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; |
| |
| 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 < st_bp->frp[src_seg].length) |
| break; |
| offset -= st_bp->frp[src_seg].length; |
| } |
| |
| st_bp->buffer_bytes = st_bp->read_pointer = total; |
| for (dst_seg=dst_offset=0; total > 0; ) { |
| count = min(st_bp->frp[dst_seg].length - dst_offset, |
| st_bp->frp[src_seg].length - src_offset); |
| memmove(page_address(st_bp->frp[dst_seg].page) + dst_offset, |
| page_address(st_bp->frp[src_seg].page) + src_offset, count); |
| src_offset += count; |
| if (src_offset >= st_bp->frp[src_seg].length) { |
| src_seg++; |
| src_offset = 0; |
| } |
| dst_offset += count; |
| if (dst_offset >= st_bp->frp[dst_seg].length) { |
| dst_seg++; |
| dst_offset = 0; |
| } |
| total -= count; |
| } |
| } |
| |
| |
| /* Fill the s/g list up to the length required for this transfer */ |
| static void buf_to_sg(struct st_buffer *STbp, unsigned int length) |
| { |
| int i; |
| unsigned int count; |
| struct scatterlist *sg; |
| struct st_buf_fragment *frp; |
| |
| if (length == STbp->frp_sg_current) |
| return; /* work already done */ |
| |
| sg = &(STbp->sg[0]); |
| frp = STbp->frp; |
| for (i=count=0; count < length; i++) { |
| sg[i].page = frp[i].page; |
| if (length - count > frp[i].length) |
| sg[i].length = frp[i].length; |
| else |
| sg[i].length = length - count; |
| count += sg[i].length; |
| sg[i].offset = 0; |
| } |
| STbp->sg_segs = i; |
| STbp->frp_sg_current = length; |
| } |
| |
| |
| /* 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 >= sizeof(parms) / sizeof(struct st_dev_parm)) |
| 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 struct file_operations st_fops = |
| { |
| .owner = THIS_MODULE, |
| .read = st_read, |
| .write = st_write, |
| .ioctl = st_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = st_compat_ioctl, |
| #endif |
| .open = st_open, |
| .flush = st_flush, |
| .release = st_release, |
| }; |
| |
| static int st_probe(struct device *dev) |
| { |
| struct scsi_device *SDp = to_scsi_device(dev); |
| struct gendisk *disk = NULL; |
| struct cdev *cdev = NULL; |
| struct scsi_tape *tpnt = NULL; |
| struct st_modedef *STm; |
| struct st_partstat *STps; |
| struct st_buffer *buffer; |
| int i, j, mode, dev_num, error; |
| char *stp; |
| u64 bounce_limit; |
| |
| if (SDp->type != TYPE_TAPE) |
| return -ENODEV; |
| if ((stp = st_incompatible(SDp))) { |
| printk(KERN_INFO |
| "st: Found incompatible tape at scsi%d, channel %d, id %d, lun %d\n", |
| SDp->host->host_no, SDp->channel, SDp->id, SDp->lun); |
| printk(KERN_INFO "st: The suggested driver is %s.\n", stp); |
| return -ENODEV; |
| } |
| |
| i = SDp->host->sg_tablesize; |
| if (st_max_sg_segs < i) |
| i = st_max_sg_segs; |
| buffer = new_tape_buffer(1, (SDp->host)->unchecked_isa_dma, i); |
| if (buffer == NULL) { |
| printk(KERN_ERR |
| "st: Can't allocate new tape buffer. Device not attached.\n"); |
| goto out; |
| } |
| |
| disk = alloc_disk(1); |
| if (!disk) { |
| printk(KERN_ERR "st: out of memory. Device not attached.\n"); |
| goto out_buffer_free; |
| } |
| |
| write_lock(&st_dev_arr_lock); |
| if (st_nr_dev >= st_dev_max) { |
| struct scsi_tape **tmp_da; |
| int tmp_dev_max; |
| |
| tmp_dev_max = max(st_nr_dev * 2, 8); |
| if (tmp_dev_max > ST_MAX_TAPES) |
| tmp_dev_max = ST_MAX_TAPES; |
| if (tmp_dev_max <= st_nr_dev) { |
| write_unlock(&st_dev_arr_lock); |
| printk(KERN_ERR "st: Too many tape devices (max. %d).\n", |
| ST_MAX_TAPES); |
| goto out_put_disk; |
| } |
| |
| tmp_da = kmalloc(tmp_dev_max * sizeof(struct scsi_tape *), GFP_ATOMIC); |
| if (tmp_da == NULL) { |
| write_unlock(&st_dev_arr_lock); |
| printk(KERN_ERR "st: Can't extend device array.\n"); |
| goto out_put_disk; |
| } |
| |
| memset(tmp_da, 0, tmp_dev_max * sizeof(struct scsi_tape *)); |
| if (scsi_tapes != NULL) { |
| memcpy(tmp_da, scsi_tapes, |
| st_dev_max * sizeof(struct scsi_tape *)); |
| kfree(scsi_tapes); |
| } |
| scsi_tapes = tmp_da; |
| |
| st_dev_max = tmp_dev_max; |
| } |
| |
| for (i = 0; i < st_dev_max; i++) |
| if (scsi_tapes[i] == NULL) |
| break; |
| if (i >= st_dev_max) |
| panic("scsi_devices corrupt (st)"); |
| |
| tpnt = kmalloc(sizeof(struct scsi_tape), GFP_ATOMIC); |
| if (tpnt == NULL) { |
| write_unlock(&st_dev_arr_lock); |
| printk(KERN_ERR "st: Can't allocate device descriptor.\n"); |
| goto out_put_disk; |
| } |
| memset(tpnt, 0, sizeof(struct scsi_tape)); |
| kref_init(&tpnt->kref); |
| tpnt->disk = disk; |
| sprintf(disk->disk_name, "st%d", i); |
| disk->private_data = &tpnt->driver; |
| disk->queue = SDp->request_queue; |
| tpnt->driver = &st_template; |
| scsi_tapes[i] = tpnt; |
| dev_num = i; |
| |
| 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->immediate = ST_NOWAIT; |
| tpnt->default_drvbuffer = 0xff; /* No forced buffering */ |
| tpnt->partition = 0; |
| tpnt->new_partition = 0; |
| tpnt->nbr_partitions = 0; |
| tpnt->device->timeout = ST_TIMEOUT; |
| tpnt->long_timeout = ST_LONG_TIMEOUT; |
| tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; |
| |
| bounce_limit = scsi_calculate_bounce_limit(SDp->host) >> PAGE_SHIFT; |
| if (bounce_limit > ULONG_MAX) |
| bounce_limit = ULONG_MAX; |
| tpnt->max_pfn = bounce_limit; |
| |
| for (i = 0; i < ST_NBR_MODES; i++) { |
| STm = &(tpnt->modes[i]); |
| STm->defined = 0; |
| 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 */ |
| } |
| |
| 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; |
| init_MUTEX(&tpnt->lock); |
| |
| st_nr_dev++; |
| write_unlock(&st_dev_arr_lock); |
| |
| for (mode = 0; mode < ST_NBR_MODES; ++mode) { |
| STm = &(tpnt->modes[mode]); |
| for (j=0; j < 2; j++) { |
| cdev = cdev_alloc(); |
| if (!cdev) { |
| printk(KERN_ERR |
| "st%d: out of memory. Device not attached.\n", |
| dev_num); |
| goto out_free_tape; |
| } |
| cdev->owner = THIS_MODULE; |
| cdev->ops = &st_fops; |
| |
| error = cdev_add(cdev, |
| MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)), |
| 1); |
| if (error) { |
| printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n", |
| dev_num, j ? "non" : "auto", mode); |
| printk(KERN_ERR "st%d: Device not attached.\n", dev_num); |
| goto out_free_tape; |
| } |
| STm->cdevs[j] = cdev; |
| |
| } |
| do_create_class_files(tpnt, dev_num, mode); |
| } |
| |
| for (mode = 0; mode < ST_NBR_MODES; ++mode) { |
| /* Make sure that the minor numbers corresponding to the four |
| first modes always get the same names */ |
| i = mode << (4 - ST_NBR_MODE_BITS); |
| /* Rewind entry */ |
| devfs_mk_cdev(MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, 0)), |
| S_IFCHR | S_IRUGO | S_IWUGO, |
| "%s/mt%s", SDp->devfs_name, st_formats[i]); |
| /* No-rewind entry */ |
| devfs_mk_cdev(MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, 1)), |
| S_IFCHR | S_IRUGO | S_IWUGO, |
| "%s/mt%sn", SDp->devfs_name, st_formats[i]); |
| } |
| disk->number = devfs_register_tape(SDp->devfs_name); |
| |
| printk(KERN_WARNING |
| "Attached scsi tape %s at scsi%d, channel %d, id %d, lun %d\n", |
| tape_name(tpnt), SDp->host->host_no, SDp->channel, SDp->id, SDp->lun); |
| printk(KERN_WARNING "%s: try direct i/o: %s (alignment %d B), max page reachable by HBA %lu\n", |
| tape_name(tpnt), tpnt->try_dio ? "yes" : "no", |
| queue_dma_alignment(SDp->request_queue) + 1, tpnt->max_pfn); |
| |
| return 0; |
| |
| out_free_tape: |
| for (mode=0; mode < ST_NBR_MODES; mode++) { |
| STm = &(tpnt->modes[mode]); |
| sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, |
| "tape"); |
| for (j=0; j < 2; j++) { |
| if (STm->cdevs[j]) { |
| if (cdev == STm->cdevs[j]) |
| cdev = NULL; |
| class_device_destroy(st_sysfs_class, |
| MKDEV(SCSI_TAPE_MAJOR, |
| TAPE_MINOR(i, mode, j))); |
| cdev_del(STm->cdevs[j]); |
| } |
| } |
| } |
| if (cdev) |
| cdev_del(cdev); |
| write_lock(&st_dev_arr_lock); |
| scsi_tapes[dev_num] = NULL; |
| st_nr_dev--; |
| write_unlock(&st_dev_arr_lock); |
| out_put_disk: |
| put_disk(disk); |
| if (tpnt) |
| kfree(tpnt); |
| out_buffer_free: |
| kfree(buffer); |
| out: |
| return -ENODEV; |
| }; |
| |
| |
| static int st_remove(struct device *dev) |
| { |
| struct scsi_device *SDp = to_scsi_device(dev); |
| struct scsi_tape *tpnt; |
| int i, j, mode; |
| |
| write_lock(&st_dev_arr_lock); |
| for (i = 0; i < st_dev_max; i++) { |
| tpnt = scsi_tapes[i]; |
| if (tpnt != NULL && tpnt->device == SDp) { |
| scsi_tapes[i] = NULL; |
| st_nr_dev--; |
| write_unlock(&st_dev_arr_lock); |
| devfs_unregister_tape(tpnt->disk->number); |
| sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, |
| "tape"); |
| for (mode = 0; mode < ST_NBR_MODES; ++mode) { |
| j = mode << (4 - ST_NBR_MODE_BITS); |
| devfs_remove("%s/mt%s", SDp->devfs_name, st_formats[j]); |
| devfs_remove("%s/mt%sn", SDp->devfs_name, st_formats[j]); |
| for (j=0; j < 2; j++) { |
| class_device_destroy(st_sysfs_class, |
| MKDEV(SCSI_TAPE_MAJOR, |
| TAPE_MINOR(i, mode, j))); |
| cdev_del(tpnt->modes[mode].cdevs[j]); |
| tpnt->modes[mode].cdevs[j] = NULL; |
| } |
| } |
| |
| down(&st_ref_sem); |
| kref_put(&tpnt->kref, scsi_tape_release); |
| up(&st_ref_sem); |
| return 0; |
| } |
| } |
| |
| write_unlock(&st_dev_arr_lock); |
| return 0; |
| } |
| |
| /** |
| * scsi_tape_release - Called to free the Scsi_Tape structure |
| * @kref: pointer to embedded kref |
| * |
| * st_ref_sem 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) { |
| tpnt->buffer->orig_frp_segs = 0; |
| normalize_buffer(tpnt->buffer); |
| kfree(tpnt->buffer); |
| } |
| |
| disk->private_data = NULL; |
| put_disk(disk); |
| kfree(tpnt); |
| return; |
| } |
| |
| static void st_intr(struct scsi_cmnd *SCpnt) |
| { |
| scsi_io_completion(SCpnt, (SCpnt->result ? 0: SCpnt->bufflen), 1); |
| } |
| |
| /* |
| * st_init_command: only called via the scsi_cmd_ioctl (block SG_IO) |
| * interface for REQ_BLOCK_PC commands. |
| */ |
| static int st_init_command(struct scsi_cmnd *SCpnt) |
| { |
| struct request *rq; |
| |
| if (!(SCpnt->request->flags & REQ_BLOCK_PC)) |
| return 0; |
| |
| rq = SCpnt->request; |
| if (sizeof(rq->cmd) > sizeof(SCpnt->cmnd)) |
| return 0; |
| |
| memcpy(SCpnt->cmnd, rq->cmd, sizeof(SCpnt->cmnd)); |
| SCpnt->cmd_len = rq->cmd_len; |
| |
| if (rq_data_dir(rq) == WRITE) |
| SCpnt->sc_data_direction = DMA_TO_DEVICE; |
| else if (rq->data_len) |
| SCpnt->sc_data_direction = DMA_FROM_DEVICE; |
| else |
| SCpnt->sc_data_direction = DMA_NONE; |
| |
| SCpnt->timeout_per_command = rq->timeout; |
| SCpnt->transfersize = rq->data_len; |
| SCpnt->done = st_intr; |
| return 1; |
| } |
| |
| static int __init init_st(void) |
| { |
| 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); |
| |
| st_sysfs_class = class_create(THIS_MODULE, "scsi_tape"); |
| if (IS_ERR(st_sysfs_class)) { |
| st_sysfs_class = NULL; |
| printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n"); |
| return 1; |
| } |
| |
| if (!register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
| ST_MAX_TAPE_ENTRIES, "st")) { |
| if (scsi_register_driver(&st_template.gendrv) == 0) { |
| do_create_driverfs_files(); |
| return 0; |
| } |
| unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
| ST_MAX_TAPE_ENTRIES); |
| } |
| class_destroy(st_sysfs_class); |
| |
| printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", SCSI_TAPE_MAJOR); |
| return 1; |
| } |
| |
| static void __exit exit_st(void) |
| { |
| do_remove_driverfs_files(); |
| scsi_unregister_driver(&st_template.gendrv); |
| unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), |
| ST_MAX_TAPE_ENTRIES); |
| class_destroy(st_sysfs_class); |
| kfree(scsi_tapes); |
| printk(KERN_INFO "st: Unloaded.\n"); |
| } |
| |
| 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 void do_create_driverfs_files(void) |
| { |
| struct device_driver *driverfs = &st_template.gendrv; |
| |
| driver_create_file(driverfs, &driver_attr_try_direct_io); |
| driver_create_file(driverfs, &driver_attr_fixed_buffer_size); |
| driver_create_file(driverfs, &driver_attr_max_sg_segs); |
| driver_create_file(driverfs, &driver_attr_version); |
| } |
| |
| static void do_remove_driverfs_files(void) |
| { |
| struct device_driver *driverfs = &st_template.gendrv; |
| |
| driver_remove_file(driverfs, &driver_attr_version); |
| driver_remove_file(driverfs, &driver_attr_max_sg_segs); |
| driver_remove_file(driverfs, &driver_attr_fixed_buffer_size); |
| driver_remove_file(driverfs, &driver_attr_try_direct_io); |
| } |
| |
| |
| /* The sysfs simple class interface */ |
| static ssize_t st_defined_show(struct class_device *class_dev, char *buf) |
| { |
| struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); |
| ssize_t l = 0; |
| |
| l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); |
| return l; |
| } |
| |
| CLASS_DEVICE_ATTR(defined, S_IRUGO, st_defined_show, NULL); |
| |
| static ssize_t st_defblk_show(struct class_device *class_dev, char *buf) |
| { |
| struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); |
| ssize_t l = 0; |
| |
| l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); |
| return l; |
| } |
| |
| CLASS_DEVICE_ATTR(default_blksize, S_IRUGO, st_defblk_show, NULL); |
| |
| static ssize_t st_defdensity_show(struct class_device *class_dev, char *buf) |
| { |
| struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_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; |
| } |
| |
| CLASS_DEVICE_ATTR(default_density, S_IRUGO, st_defdensity_show, NULL); |
| |
| static ssize_t st_defcompression_show(struct class_device *class_dev, char *buf) |
| { |
| struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev); |
| ssize_t l = 0; |
| |
| l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); |
| return l; |
| } |
| |
| CLASS_DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL); |
| |
| static void do_create_class_files(struct scsi_tape *STp, int dev_num, int mode) |
| { |
| int i, rew, error; |
| char name[10]; |
| struct class_device *st_class_member; |
| |
| if (!st_sysfs_class) |
| return; |
| |
| for (rew=0; rew < 2; rew++) { |
| /* Make sure that the minor numbers corresponding to the four |
| first modes always get the same names */ |
| i = mode << (4 - ST_NBR_MODE_BITS); |
| snprintf(name, 10, "%s%s%s", rew ? "n" : "", |
| STp->disk->disk_name, st_formats[i]); |
| st_class_member = |
| class_device_create(st_sysfs_class, |
| MKDEV(SCSI_TAPE_MAJOR, |
| TAPE_MINOR(dev_num, mode, rew)), |
| &STp->device->sdev_gendev, "%s", name); |
| if (IS_ERR(st_class_member)) { |
| printk(KERN_WARNING "st%d: class_device_create failed\n", |
| dev_num); |
| goto out; |
| } |
| class_set_devdata(st_class_member, &STp->modes[mode]); |
| |
| class_device_create_file(st_class_member, |
| &class_device_attr_defined); |
| class_device_create_file(st_class_member, |
| &class_device_attr_default_blksize); |
| class_device_create_file(st_class_member, |
| &class_device_attr_default_density); |
| class_device_create_file(st_class_member, |
| &class_device_attr_default_compression); |
| if (mode == 0 && rew == 0) { |
| error = sysfs_create_link(&STp->device->sdev_gendev.kobj, |
| &st_class_member->kobj, |
| "tape"); |
| if (error) { |
| printk(KERN_ERR |
| "st%d: Can't create sysfs link from SCSI device.\n", |
| dev_num); |
| } |
| } |
| } |
| out: |
| return; |
| } |
| |
| |
| /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if |
| - mapping of all pages not successful |
| - any page is above max_pfn |
| (i.e., either completely successful or fails) |
| */ |
| static int st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, |
| unsigned long uaddr, size_t count, int rw, |
| unsigned long max_pfn) |
| { |
| int i, nr_pages; |
| |
| nr_pages = sgl_map_user_pages(sgl, max_pages, uaddr, count, rw); |
| if (nr_pages <= 0) |
| return nr_pages; |
| |
| for (i=0; i < nr_pages; i++) { |
| if (page_to_pfn(sgl[i].page) > max_pfn) |
| goto out_unmap; |
| } |
| return nr_pages; |
| |
| out_unmap: |
| sgl_unmap_user_pages(sgl, nr_pages, 0); |
| return 0; |
| } |
| |
| |
| /* The following functions may be useful for a larger audience. */ |
| static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, |
| unsigned long uaddr, size_t count, int rw) |
| { |
| unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| unsigned long start = uaddr >> PAGE_SHIFT; |
| const int nr_pages = end - start; |
| int res, i, j; |
| struct page **pages; |
| |
| /* 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 */ |
| down_read(¤t->mm->mmap_sem); |
| /* rw==READ means read from drive, write into memory area */ |
| res = get_user_pages( |
| current, |
| current->mm, |
| uaddr, |
| nr_pages, |
| rw == READ, |
| 0, /* don't force */ |
| pages, |
| NULL); |
| up_read(¤t->mm->mmap_sem); |
| |
| /* 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]); |
| } |
| |
| /* Populate the scatter/gather list */ |
| sgl[0].page = pages[0]; |
| sgl[0].offset = uaddr & ~PAGE_MASK; |
| if (nr_pages > 1) { |
| sgl[0].length = PAGE_SIZE - sgl[0].offset; |
| count -= sgl[0].length; |
| for (i=1; i < nr_pages ; i++) { |
| sgl[i].offset = 0; |
| sgl[i].page = pages[i]; |
| sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; |
| count -= PAGE_SIZE; |
| } |
| } |
| else { |
| sgl[0].length = count; |
| } |
| |
| kfree(pages); |
| return nr_pages; |
| |
| out_unmap: |
| if (res > 0) { |
| for (j=0; j < res; j++) |
| page_cache_release(pages[j]); |
| } |
| kfree(pages); |
| return res; |
| } |
| |
| |
| /* And unmap them... */ |
| static int sgl_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, |
| int dirtied) |
| { |
| int i; |
| |
| for (i=0; i < nr_pages; i++) { |
| if (dirtied && !PageReserved(sgl[i].page)) |
| SetPageDirty(sgl[i].page); |
| /* FIXME: cache flush missing for rw==READ |
| * FIXME: call the correct reference counting function |
| */ |
| page_cache_release(sgl[i].page); |
| } |
| |
| return 0; |
| } |