SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/scsi/sg.c

   1 /*
   2  *  History:
   3  *  Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
   4  *           to allow user process control of SCSI devices.
   5  *  Development Sponsored by Killy Corp. NY NY
   6  *
   7  * Original driver (sg.c):
   8  *        Copyright (C) 1992 Lawrence Foard
   9  * Version 2 and 3 extensions to driver:
  10  *        Copyright (C) 1998 - 2005 Douglas Gilbert
  11  *
  12  *  Modified  19-JAN-1998  Richard Gooch <rgooch@atnf.csiro.au>  Devfs support
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  */
  20
  21 static int sg_version_num = 30534;      /* 2 digits for each component */
  22 #define SG_VERSION_STR "3.5.34"
  23
  24 /*
  25  *  D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
  26  *      - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
  27  *        the kernel/module needs to be built with CONFIG_SCSI_LOGGING
  28  *        (otherwise the macros compile to empty statements).
  29  *
  30  */
  31 #include <linux/module.h>
  32
  33 #include <linux/fs.h>
  34 #include <linux/kernel.h>
  35 #include <linux/sched.h>
  36 #include <linux/string.h>
  37 #include <linux/mm.h>
  38 #include <linux/errno.h>
  39 #include <linux/mtio.h>
  40 #include <linux/ioctl.h>
  41 #include <linux/fcntl.h>
  42 #include <linux/init.h>
  43 #include <linux/poll.h>
  44 #include <linux/moduleparam.h>
  45 #include <linux/cdev.h>
  46 #include <linux/idr.h>
  47 #include <linux/seq_file.h>
  48 #include <linux/blkdev.h>
  49 #include <linux/delay.h>
  50 #include <linux/scatterlist.h>
  51 #include <linux/blktrace_api.h>
  52 #include <linux/smp_lock.h>
  53
  54 #include "scsi.h"
  55 #include <scsi/scsi_dbg.h>
  56 #include <scsi/scsi_host.h>
  57 #include <scsi/scsi_driver.h>
  58 #include <scsi/scsi_ioctl.h>
  59 #include <scsi/sg.h>
  60
  61 #include "scsi_logging.h"
  62
  63 #ifdef CONFIG_SCSI_PROC_FS
  64 #include <linux/proc_fs.h>
  65 static char *sg_version_date = "20061027";
  66
  67 static int sg_proc_init(void);
  68 static void sg_proc_cleanup(void);
  69 #endif
  70
  71 #define SG_ALLOW_DIO_DEF 0
  72 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
  73
  74 #define SG_MAX_DEVS 32768
  75
  76 /*
  77  * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
  78  * Then when using 32 bit integers x * m may overflow during the calculation.
  79  * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
  80  * calculates the same, but prevents the overflow when both m and d
  81  * are "small" numbers (like HZ and USER_HZ).
  82  * Of course an overflow is inavoidable if the result of muldiv doesn't fit
  83  * in 32 bits.
  84  */
  85 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
  86
  87 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
  88
  89 int sg_big_buff = SG_DEF_RESERVED_SIZE;
  90 /* N.B. This variable is readable and writeable via
  91    /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
  92    of this size (or less if there is not enough memory) will be reserved
  93    for use by this file descriptor. [Deprecated usage: this variable is also
  94    readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
  95    the kernel (i.e. it is not a module).] */
  96 static int def_reserved_size = -1;      /* picks up init parameter */
  97 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
  98
  99 static int scatter_elem_sz = SG_SCATTER_SZ;
 100 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
 101
 102 #define SG_SECTOR_SZ 512
 103 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
 104
 105 static int sg_add(struct device *, struct class_interface *);
 106 static void sg_remove(struct device *, struct class_interface *);
 107
 108 static DEFINE_IDR(sg_index_idr);
 109 static DEFINE_RWLOCK(sg_index_lock);    /* Also used to lock
 110                                                            file descriptor list for device */
 111
 112 static struct class_interface sg_interface = {
 113         .add_dev        = sg_add,
 114         .remove_dev     = sg_remove,
 115 };
 116
 117 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
 118         unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
 119         unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
 120         unsigned bufflen;       /* Size of (aggregate) data buffer */
 121         unsigned b_malloc_len;  /* actual len malloc'ed in buffer */
 122         struct scatterlist *buffer;/* scatter list */
 123         char dio_in_use;        /* 0->indirect IO (or mmap), 1->dio */
 124         unsigned char cmd_opcode; /* first byte of command */
 125 } Sg_scatter_hold;
 126
 127 struct sg_device;               /* forward declarations */
 128 struct sg_fd;
 129
 130 typedef struct sg_request {     /* SG_MAX_QUEUE requests outstanding per file */
 131         struct sg_request *nextrp;      /* NULL -> tail request (slist) */
 132         struct sg_fd *parentfp; /* NULL -> not in use */
 133         Sg_scatter_hold data;   /* hold buffer, perhaps scatter list */
 134         sg_io_hdr_t header;     /* scsi command+info, see <scsi/sg.h> */
 135         unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
 136         char res_used;          /* 1 -> using reserve buffer, 0 -> not ... */
 137         char orphan;            /* 1 -> drop on sight, 0 -> normal */
 138         char sg_io_owned;       /* 1 -> packet belongs to SG_IO */
 139         volatile char done;     /* 0->before bh, 1->before read, 2->read */
 140         struct request *rq;
 141         struct bio *bio;
 142 } Sg_request;
 143
 144 typedef struct sg_fd {          /* holds the state of a file descriptor */
 145         struct sg_fd *nextfp;   /* NULL when last opened fd on this device */
 146         struct sg_device *parentdp;     /* owning device */
 147         wait_queue_head_t read_wait;    /* queue read until command done */
 148         rwlock_t rq_list_lock;  /* protect access to list in req_arr */
 149         int timeout;            /* defaults to SG_DEFAULT_TIMEOUT      */
 150         int timeout_user;       /* defaults to SG_DEFAULT_TIMEOUT_USER */
 151         Sg_scatter_hold reserve;        /* buffer held for this file descriptor */
 152         unsigned save_scat_len; /* original length of trunc. scat. element */
 153         Sg_request *headrp;     /* head of request slist, NULL->empty */
 154         struct fasync_struct *async_qp; /* used by asynchronous notification */
 155         Sg_request req_arr[SG_MAX_QUEUE];       /* used as singly-linked list */
 156         char low_dma;           /* as in parent but possibly overridden to 1 */
 157         char force_packid;      /* 1 -> pack_id input to read(), 0 -> ignored */
 158         volatile char closed;   /* 1 -> fd closed but request(s) outstanding */
 159         char cmd_q;             /* 1 -> allow command queuing, 0 -> don't */
 160         char next_cmd_len;      /* 0 -> automatic (def), >0 -> use on next write() */
 161         char keep_orphan;       /* 0 -> drop orphan (def), 1 -> keep for read() */
 162         char mmap_called;       /* 0 -> mmap() never called on this fd */
 163 } Sg_fd;
 164
 165 typedef struct sg_device { /* holds the state of each scsi generic device */
 166         struct scsi_device *device;
 167         wait_queue_head_t o_excl_wait;  /* queue open() when O_EXCL in use */
 168         int sg_tablesize;       /* adapter's max scatter-gather table size */
 169         u32 index;              /* device index number */
 170         Sg_fd *headfp;          /* first open fd belonging to this device */
 171         volatile char detached; /* 0->attached, 1->detached pending removal */
 172         volatile char exclude;  /* opened for exclusive access */
 173         char sgdebug;           /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
 174         struct gendisk *disk;
 175         struct cdev * cdev;     /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
 176 } Sg_device;
 177
 178 static int sg_fasync(int fd, struct file *filp, int mode);
 179 /* tasklet or soft irq callback */
 180 static void sg_cmd_done(void *data, char *sense, int result, int resid);
 181 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
 182 static void sg_finish_rem_req(Sg_request * srp);
 183 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
 184 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
 185                          int tablesize);
 186 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
 187                            Sg_request * srp);
 188 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
 189                         const char __user *buf, size_t count, int blocking,
 190                         int read_only, Sg_request **o_srp);
 191 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
 192                            unsigned char *cmnd, int timeout, int blocking);
 193 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
 194                       int wr_xf, int *countp, unsigned char __user **up);
 195 static int sg_write_xfer(Sg_request * srp);
 196 static int sg_read_xfer(Sg_request * srp);
 197 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
 198 static void sg_remove_scat(Sg_scatter_hold * schp);
 199 static void sg_build_reserve(Sg_fd * sfp, int req_size);
 200 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
 201 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
 202 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
 203 static void sg_page_free(struct page *page, int size);
 204 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
 205 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
 206 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
 207 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
 208 static Sg_request *sg_add_request(Sg_fd * sfp);
 209 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
 210 static int sg_res_in_use(Sg_fd * sfp);
 211 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
 212 static Sg_device *sg_get_dev(int dev);
 213 #ifdef CONFIG_SCSI_PROC_FS
 214 static int sg_last_dev(void);
 215 #endif
 216
 217 #define SZ_SG_HEADER sizeof(struct sg_header)
 218 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
 219 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
 220 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
 221
 222 static int sg_allow_access(struct file *filp, unsigned char *cmd)
 223 {
 224         struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
 225         struct request_queue *q = sfp->parentdp->device->request_queue;
 226
 227         if (sfp->parentdp->device->type == TYPE_SCANNER)
 228                 return 0;
 229
 230         return blk_verify_command(&q->cmd_filter,
 231                                   cmd, filp->f_mode & FMODE_WRITE);
 232 }
 233
 234 static void sg_rq_end_io(struct request *rq, int uptodate)
 235 {
 236         sg_cmd_done(rq->end_io_data, rq->sense, rq->errors, rq->data_len);
 237 }
 238
 239 static int
 240 sg_open(struct inode *inode, struct file *filp)
 241 {
 242         int dev = iminor(inode);
 243         int flags = filp->f_flags;
 244         struct request_queue *q;
 245         Sg_device *sdp;
 246         Sg_fd *sfp;
 247         int res;
 248         int retval;
 249
 250         lock_kernel();
 251         nonseekable_open(inode, filp);
 252         SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
 253         sdp = sg_get_dev(dev);
 254         if ((!sdp) || (!sdp->device)) {
 255                 unlock_kernel();
 256                 return -ENXIO;
 257         }
 258         if (sdp->detached) {
 259                 unlock_kernel();
 260                 return -ENODEV;
 261         }
 262
 263         /* This driver's module count bumped by fops_get in <linux/fs.h> */
 264         /* Prevent the device driver from vanishing while we sleep */
 265         retval = scsi_device_get(sdp->device);
 266         if (retval) {
 267                 unlock_kernel();
 268                 return retval;
 269         }
 270
 271         if (!((flags & O_NONBLOCK) ||
 272               scsi_block_when_processing_errors(sdp->device))) {
 273                 retval = -ENXIO;
 274                 /* we are in error recovery for this device */
 275                 goto error_out;
 276         }
 277
 278         if (flags & O_EXCL) {
 279                 if (O_RDONLY == (flags & O_ACCMODE)) {
 280                         retval = -EPERM; /* Can't lock it with read only access */
 281                         goto error_out;
 282                 }
 283                 if (sdp->headfp && (flags & O_NONBLOCK)) {
 284                         retval = -EBUSY;
 285                         goto error_out;
 286                 }
 287                 res = 0;
 288                 __wait_event_interruptible(sdp->o_excl_wait,
 289                         ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
 290                 if (res) {
 291                         retval = res;   /* -ERESTARTSYS because signal hit process */
 292                         goto error_out;
 293                 }
 294         } else if (sdp->exclude) {      /* some other fd has an exclusive lock on dev */
 295                 if (flags & O_NONBLOCK) {
 296                         retval = -EBUSY;
 297                         goto error_out;
 298                 }
 299                 res = 0;
 300                 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
 301                                            res);
 302                 if (res) {
 303                         retval = res;   /* -ERESTARTSYS because signal hit process */
 304                         goto error_out;
 305                 }
 306         }
 307         if (sdp->detached) {
 308                 retval = -ENODEV;
 309                 goto error_out;
 310         }
 311         if (!sdp->headfp) {     /* no existing opens on this device */
 312                 sdp->sgdebug = 0;
 313                 q = sdp->device->request_queue;
 314                 sdp->sg_tablesize = min(q->max_hw_segments,
 315                                         q->max_phys_segments);
 316         }
 317         if ((sfp = sg_add_sfp(sdp, dev)))
 318                 filp->private_data = sfp;
 319         else {
 320                 if (flags & O_EXCL)
 321                         sdp->exclude = 0;       /* undo if error */
 322                 retval = -ENOMEM;
 323                 goto error_out;
 324         }
 325         unlock_kernel();
 326         return 0;
 327
 328       error_out:
 329         scsi_device_put(sdp->device);
 330         unlock_kernel();
 331         return retval;
 332 }
 333
 334 /* Following function was formerly called 'sg_close' */
 335 static int
 336 sg_release(struct inode *inode, struct file *filp)
 337 {
 338         Sg_device *sdp;
 339         Sg_fd *sfp;
 340
 341         if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 342                 return -ENXIO;
 343         SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
 344         sg_fasync(-1, filp, 0); /* remove filp from async notification list */
 345         if (0 == sg_remove_sfp(sdp, sfp)) {     /* Returns 1 when sdp gone */
 346                 if (!sdp->detached) {
 347                         scsi_device_put(sdp->device);
 348                 }
 349                 sdp->exclude = 0;
 350                 wake_up_interruptible(&sdp->o_excl_wait);
 351         }
 352         return 0;
 353 }
 354
 355 static ssize_t
 356 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
 357 {
 358         Sg_device *sdp;
 359         Sg_fd *sfp;
 360         Sg_request *srp;
 361         int req_pack_id = -1;
 362         sg_io_hdr_t *hp;
 363         struct sg_header *old_hdr = NULL;
 364         int retval = 0;
 365
 366         if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 367                 return -ENXIO;
 368         SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
 369                                    sdp->disk->disk_name, (int) count));
 370
 371         if (!access_ok(VERIFY_WRITE, buf, count))
 372                 return -EFAULT;
 373         if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
 374                 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
 375                 if (!old_hdr)
 376                         return -ENOMEM;
 377                 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
 378                         retval = -EFAULT;
 379                         goto free_old_hdr;
 380                 }
 381                 if (old_hdr->reply_len < 0) {
 382                         if (count >= SZ_SG_IO_HDR) {
 383                                 sg_io_hdr_t *new_hdr;
 384                                 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
 385                                 if (!new_hdr) {
 386                                         retval = -ENOMEM;
 387                                         goto free_old_hdr;
 388                                 }
 389                                 retval =__copy_from_user
 390                                     (new_hdr, buf, SZ_SG_IO_HDR);
 391                                 req_pack_id = new_hdr->pack_id;
 392                                 kfree(new_hdr);
 393                                 if (retval) {
 394                                         retval = -EFAULT;
 395                                         goto free_old_hdr;
 396                                 }
 397                         }
 398                 } else
 399                         req_pack_id = old_hdr->pack_id;
 400         }
 401         srp = sg_get_rq_mark(sfp, req_pack_id);
 402         if (!srp) {             /* now wait on packet to arrive */
 403                 if (sdp->detached) {
 404                         retval = -ENODEV;
 405                         goto free_old_hdr;
 406                 }
 407                 if (filp->f_flags & O_NONBLOCK) {
 408                         retval = -EAGAIN;
 409                         goto free_old_hdr;
 410                 }
 411                 while (1) {
 412                         retval = 0; /* following macro beats race condition */
 413                         __wait_event_interruptible(sfp->read_wait,
 414                                 (sdp->detached ||
 415                                 (srp = sg_get_rq_mark(sfp, req_pack_id))),
 416                                 retval);
 417                         if (sdp->detached) {
 418                                 retval = -ENODEV;
 419                                 goto free_old_hdr;
 420                         }
 421                         if (0 == retval)
 422                                 break;
 423
 424                         /* -ERESTARTSYS as signal hit process */
 425                         goto free_old_hdr;
 426                 }
 427         }
 428         if (srp->header.interface_id != '\0') {
 429                 retval = sg_new_read(sfp, buf, count, srp);
 430                 goto free_old_hdr;
 431         }
 432
 433         hp = &srp->header;
 434         if (old_hdr == NULL) {
 435                 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
 436                 if (! old_hdr) {
 437                         retval = -ENOMEM;
 438                         goto free_old_hdr;
 439                 }
 440         }
 441         memset(old_hdr, 0, SZ_SG_HEADER);
 442         old_hdr->reply_len = (int) hp->timeout;
 443         old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
 444         old_hdr->pack_id = hp->pack_id;
 445         old_hdr->twelve_byte =
 446             ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
 447         old_hdr->target_status = hp->masked_status;
 448         old_hdr->host_status = hp->host_status;
 449         old_hdr->driver_status = hp->driver_status;
 450         if ((CHECK_CONDITION & hp->masked_status) ||
 451             (DRIVER_SENSE & hp->driver_status))
 452                 memcpy(old_hdr->sense_buffer, srp->sense_b,
 453                        sizeof (old_hdr->sense_buffer));
 454         switch (hp->host_status) {
 455         /* This setup of 'result' is for backward compatibility and is best
 456            ignored by the user who should use target, host + driver status */
 457         case DID_OK:
 458         case DID_PASSTHROUGH:
 459         case DID_SOFT_ERROR:
 460                 old_hdr->result = 0;
 461                 break;
 462         case DID_NO_CONNECT:
 463         case DID_BUS_BUSY:
 464         case DID_TIME_OUT:
 465                 old_hdr->result = EBUSY;
 466                 break;
 467         case DID_BAD_TARGET:
 468         case DID_ABORT:
 469         case DID_PARITY:
 470         case DID_RESET:
 471         case DID_BAD_INTR:
 472                 old_hdr->result = EIO;
 473                 break;
 474         case DID_ERROR:
 475                 old_hdr->result = (srp->sense_b[0] == 0 &&
 476                                   hp->masked_status == GOOD) ? 0 : EIO;
 477                 break;
 478         default:
 479                 old_hdr->result = EIO;
 480                 break;
 481         }
 482
 483         /* Now copy the result back to the user buffer.  */
 484         if (count >= SZ_SG_HEADER) {
 485                 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
 486                         retval = -EFAULT;
 487                         goto free_old_hdr;
 488                 }
 489                 buf += SZ_SG_HEADER;
 490                 if (count > old_hdr->reply_len)
 491                         count = old_hdr->reply_len;
 492                 if (count > SZ_SG_HEADER) {
 493                         if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
 494                                 retval = -EFAULT;
 495                                 goto free_old_hdr;
 496                         }
 497                 }
 498         } else
 499                 count = (old_hdr->result == 0) ? 0 : -EIO;
 500         sg_finish_rem_req(srp);
 501         retval = count;
 502 free_old_hdr:
 503         kfree(old_hdr);
 504         return retval;
 505 }
 506
 507 static ssize_t
 508 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
 509 {
 510         sg_io_hdr_t *hp = &srp->header;
 511         int err = 0;
 512         int len;
 513
 514         if (count < SZ_SG_IO_HDR) {
 515                 err = -EINVAL;
 516                 goto err_out;
 517         }
 518         hp->sb_len_wr = 0;
 519         if ((hp->mx_sb_len > 0) && hp->sbp) {
 520                 if ((CHECK_CONDITION & hp->masked_status) ||
 521                     (DRIVER_SENSE & hp->driver_status)) {
 522                         int sb_len = SCSI_SENSE_BUFFERSIZE;
 523                         sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
 524                         len = 8 + (int) srp->sense_b[7];        /* Additional sense length field */
 525                         len = (len > sb_len) ? sb_len : len;
 526                         if (copy_to_user(hp->sbp, srp->sense_b, len)) {
 527                                 err = -EFAULT;
 528                                 goto err_out;
 529                         }
 530                         hp->sb_len_wr = len;
 531                 }
 532         }
 533         if (hp->masked_status || hp->host_status || hp->driver_status)
 534                 hp->info |= SG_INFO_CHECK;
 535         if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
 536                 err = -EFAULT;
 537                 goto err_out;
 538         }
 539         err = sg_read_xfer(srp);
 540       err_out:
 541         sg_finish_rem_req(srp);
 542         return (0 == err) ? count : err;
 543 }
 544
 545 static ssize_t
 546 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
 547 {
 548         int mxsize, cmd_size, k;
 549         int input_size, blocking;
 550         unsigned char opcode;
 551         Sg_device *sdp;
 552         Sg_fd *sfp;
 553         Sg_request *srp;
 554         struct sg_header old_hdr;
 555         sg_io_hdr_t *hp;
 556         unsigned char cmnd[MAX_COMMAND_SIZE];
 557
 558         if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 559                 return -ENXIO;
 560         SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
 561                                    sdp->disk->disk_name, (int) count));
 562         if (sdp->detached)
 563                 return -ENODEV;
 564         if (!((filp->f_flags & O_NONBLOCK) ||
 565               scsi_block_when_processing_errors(sdp->device)))
 566                 return -ENXIO;
 567
 568         if (!access_ok(VERIFY_READ, buf, count))
 569                 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
 570         if (count < SZ_SG_HEADER)
 571                 return -EIO;
 572         if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
 573                 return -EFAULT;
 574         blocking = !(filp->f_flags & O_NONBLOCK);
 575         if (old_hdr.reply_len < 0)
 576                 return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL);
 577         if (count < (SZ_SG_HEADER + 6))
 578                 return -EIO;    /* The minimum scsi command length is 6 bytes. */
 579
 580         if (!(srp = sg_add_request(sfp))) {
 581                 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
 582                 return -EDOM;
 583         }
 584         buf += SZ_SG_HEADER;
 585         __get_user(opcode, buf);
 586         if (sfp->next_cmd_len > 0) {
 587                 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
 588                         SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
 589                         sfp->next_cmd_len = 0;
 590                         sg_remove_request(sfp, srp);
 591                         return -EIO;
 592                 }
 593                 cmd_size = sfp->next_cmd_len;
 594                 sfp->next_cmd_len = 0;  /* reset so only this write() effected */
 595         } else {
 596                 cmd_size = COMMAND_SIZE(opcode);        /* based on SCSI command group */
 597                 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
 598                         cmd_size = 12;
 599         }
 600         SCSI_LOG_TIMEOUT(4, printk(
 601                 "sg_write:   scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
 602 /* Determine buffer size.  */
 603         input_size = count - cmd_size;
 604         mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
 605         mxsize -= SZ_SG_HEADER;
 606         input_size -= SZ_SG_HEADER;
 607         if (input_size < 0) {
 608                 sg_remove_request(sfp, srp);
 609                 return -EIO;    /* User did not pass enough bytes for this command. */
 610         }
 611         hp = &srp->header;
 612         hp->interface_id = '\0';        /* indicator of old interface tunnelled */
 613         hp->cmd_len = (unsigned char) cmd_size;
 614         hp->iovec_count = 0;
 615         hp->mx_sb_len = 0;
 616         if (input_size > 0)
 617                 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
 618                     SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
 619         else
 620                 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
 621         hp->dxfer_len = mxsize;
 622         hp->dxferp = (char __user *)buf + cmd_size;
 623         hp->sbp = NULL;
 624         hp->timeout = old_hdr.reply_len;        /* structure abuse ... */
 625         hp->flags = input_size; /* structure abuse ... */
 626         hp->pack_id = old_hdr.pack_id;
 627         hp->usr_ptr = NULL;
 628         if (__copy_from_user(cmnd, buf, cmd_size))
 629                 return -EFAULT;
 630         /*
 631          * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
 632          * but is is possible that the app intended SG_DXFER_TO_DEV, because there
 633          * is a non-zero input_size, so emit a warning.
 634          */
 635         if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
 636                 static char cmd[TASK_COMM_LEN];
 637                 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
 638                         printk(KERN_WARNING
 639                                "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
 640                                "guessing data in;\n" KERN_WARNING "   "
 641                                "program %s not setting count and/or reply_len properly\n",
 642                                old_hdr.reply_len - (int)SZ_SG_HEADER,
 643                                input_size, (unsigned int) cmnd[0],
 644                                current->comm);
 645                         strcpy(cmd, current->comm);
 646                 }
 647         }
 648         k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
 649         return (k < 0) ? k : count;
 650 }
 651
 652 static ssize_t
 653 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
 654                  size_t count, int blocking, int read_only,
 655                  Sg_request **o_srp)
 656 {
 657         int k;
 658         Sg_request *srp;
 659         sg_io_hdr_t *hp;
 660         unsigned char cmnd[MAX_COMMAND_SIZE];
 661         int timeout;
 662         unsigned long ul_timeout;
 663
 664         if (count < SZ_SG_IO_HDR)
 665                 return -EINVAL;
 666         if (!access_ok(VERIFY_READ, buf, count))
 667                 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
 668
 669         sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
 670         if (!(srp = sg_add_request(sfp))) {
 671                 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
 672                 return -EDOM;
 673         }
 674         hp = &srp->header;
 675         if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
 676                 sg_remove_request(sfp, srp);
 677                 return -EFAULT;
 678         }
 679         if (hp->interface_id != 'S') {
 680                 sg_remove_request(sfp, srp);
 681                 return -ENOSYS;
 682         }
 683         if (hp->flags & SG_FLAG_MMAP_IO) {
 684                 if (hp->dxfer_len > sfp->reserve.bufflen) {
 685                         sg_remove_request(sfp, srp);
 686                         return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
 687                 }
 688                 if (hp->flags & SG_FLAG_DIRECT_IO) {
 689                         sg_remove_request(sfp, srp);
 690                         return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
 691                 }
 692                 if (sg_res_in_use(sfp)) {
 693                         sg_remove_request(sfp, srp);
 694                         return -EBUSY;  /* reserve buffer already being used */
 695                 }
 696         }
 697         ul_timeout = msecs_to_jiffies(srp->header.timeout);
 698         timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
 699         if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
 700                 sg_remove_request(sfp, srp);
 701                 return -EMSGSIZE;
 702         }
 703         if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
 704                 sg_remove_request(sfp, srp);
 705                 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
 706         }
 707         if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
 708                 sg_remove_request(sfp, srp);
 709                 return -EFAULT;
 710         }
 711         if (read_only && sg_allow_access(file, cmnd)) {
 712                 sg_remove_request(sfp, srp);
 713                 return -EPERM;
 714         }
 715         k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
 716         if (k < 0)
 717                 return k;
 718         if (o_srp)
 719                 *o_srp = srp;
 720         return count;
 721 }
 722
 723 static int
 724 sg_common_write(Sg_fd * sfp, Sg_request * srp,
 725                 unsigned char *cmnd, int timeout, int blocking)
 726 {
 727         int k, data_dir;
 728         Sg_device *sdp = sfp->parentdp;
 729         sg_io_hdr_t *hp = &srp->header;
 730
 731         srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
 732         hp->status = 0;
 733         hp->masked_status = 0;
 734         hp->msg_status = 0;
 735         hp->info = 0;
 736         hp->host_status = 0;
 737         hp->driver_status = 0;
 738         hp->resid = 0;
 739         SCSI_LOG_TIMEOUT(4, printk("sg_common_write:  scsi opcode=0x%02x, cmd_size=%d\n",
 740                           (int) cmnd[0], (int) hp->cmd_len));
 741
 742         k = sg_start_req(srp, cmnd);
 743         if (k) {
 744                 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
 745                 sg_finish_rem_req(srp);
 746                 return k;       /* probably out of space --> ENOMEM */
 747         }
 748         if ((k = sg_write_xfer(srp))) {
 749                 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
 750                 sg_finish_rem_req(srp);
 751                 return k;
 752         }
 753         if (sdp->detached) {
 754                 sg_finish_rem_req(srp);
 755                 return -ENODEV;
 756         }
 757
 758         switch (hp->dxfer_direction) {
 759         case SG_DXFER_TO_FROM_DEV:
 760         case SG_DXFER_FROM_DEV:
 761                 data_dir = DMA_FROM_DEVICE;
 762                 break;
 763         case SG_DXFER_TO_DEV:
 764                 data_dir = DMA_TO_DEVICE;
 765                 break;
 766         case SG_DXFER_UNKNOWN:
 767                 data_dir = DMA_BIDIRECTIONAL;
 768                 break;
 769         default:
 770                 data_dir = DMA_NONE;
 771                 break;
 772         }
 773         hp->duration = jiffies_to_msecs(jiffies);
 774 /* Now send everything of to mid-level. The next time we hear about this
 775    packet is when sg_cmd_done() is called (i.e. a callback). */
 776         if (srp->rq) {
 777                 srp->rq->timeout = timeout;
 778                 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
 779                                       srp->rq, 1, sg_rq_end_io);
 780                 return 0;
 781         }
 782         if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer,
 783                                 hp->dxfer_len, srp->data.k_use_sg, timeout,
 784                                 SG_DEFAULT_RETRIES, srp, sg_cmd_done,
 785                                 GFP_ATOMIC)) {
 786                 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n"));
 787                 /*
 788                  * most likely out of mem, but could also be a bad map
 789                  */
 790                 sg_finish_rem_req(srp);
 791                 return -ENOMEM;
 792         } else
 793                 return 0;
 794 }
 795
 796 static int
 797 sg_srp_done(Sg_request *srp, Sg_fd *sfp)
 798 {
 799         unsigned long iflags;
 800         int done;
 801
 802         read_lock_irqsave(&sfp->rq_list_lock, iflags);
 803         done = srp->done;
 804         read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
 805         return done;
 806 }
 807
 808 static int
 809 sg_ioctl(struct inode *inode, struct file *filp,
 810          unsigned int cmd_in, unsigned long arg)
 811 {
 812         void __user *p = (void __user *)arg;
 813         int __user *ip = p;
 814         int result, val, read_only;
 815         Sg_device *sdp;
 816         Sg_fd *sfp;
 817         Sg_request *srp;
 818         unsigned long iflags;
 819
 820         if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 821                 return -ENXIO;
 822
 823         SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
 824                                    sdp->disk->disk_name, (int) cmd_in));
 825         read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
 826
 827         switch (cmd_in) {
 828         case SG_IO:
 829                 {
 830                         int blocking = 1;       /* ignore O_NONBLOCK flag */
 831
 832                         if (sdp->detached)
 833                                 return -ENODEV;
 834                         if (!scsi_block_when_processing_errors(sdp->device))
 835                                 return -ENXIO;
 836                         if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
 837                                 return -EFAULT;
 838                         result =
 839                             sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
 840                                          blocking, read_only, &srp);
 841                         if (result < 0)
 842                                 return result;
 843                         srp->sg_io_owned = 1;
 844                         while (1) {
 845                                 result = 0;     /* following macro to beat race condition */
 846                                 __wait_event_interruptible(sfp->read_wait,
 847                                         (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
 848                                                            result);
 849                                 if (sdp->detached)
 850                                         return -ENODEV;
 851                                 if (sfp->closed)
 852                                         return 0;       /* request packet dropped already */
 853                                 if (0 == result)
 854                                         break;
 855                                 srp->orphan = 1;
 856                                 return result;  /* -ERESTARTSYS because signal hit process */
 857                         }
 858                         write_lock_irqsave(&sfp->rq_list_lock, iflags);
 859                         srp->done = 2;
 860                         write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
 861                         result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
 862                         return (result < 0) ? result : 0;
 863                 }
 864         case SG_SET_TIMEOUT:
 865                 result = get_user(val, ip);
 866                 if (result)
 867                         return result;
 868                 if (val < 0)
 869                         return -EIO;
 870                 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
 871                     val = MULDIV (INT_MAX, USER_HZ, HZ);
 872                 sfp->timeout_user = val;
 873                 sfp->timeout = MULDIV (val, HZ, USER_HZ);
 874
 875                 return 0;
 876         case SG_GET_TIMEOUT:    /* N.B. User receives timeout as return value */
 877                                 /* strange ..., for backward compatibility */
 878                 return sfp->timeout_user;
 879         case SG_SET_FORCE_LOW_DMA:
 880                 result = get_user(val, ip);
 881                 if (result)
 882                         return result;
 883                 if (val) {
 884                         sfp->low_dma = 1;
 885                         if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
 886                                 val = (int) sfp->reserve.bufflen;
 887                                 sg_remove_scat(&sfp->reserve);
 888                                 sg_build_reserve(sfp, val);
 889                         }
 890                 } else {
 891                         if (sdp->detached)
 892                                 return -ENODEV;
 893                         sfp->low_dma = sdp->device->host->unchecked_isa_dma;
 894                 }
 895                 return 0;
 896         case SG_GET_LOW_DMA:
 897                 return put_user((int) sfp->low_dma, ip);
 898         case SG_GET_SCSI_ID:
 899                 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
 900                         return -EFAULT;
 901                 else {
 902                         sg_scsi_id_t __user *sg_idp = p;
 903
 904                         if (sdp->detached)
 905                                 return -ENODEV;
 906                         __put_user((int) sdp->device->host->host_no,
 907                                    &sg_idp->host_no);
 908                         __put_user((int) sdp->device->channel,
 909                                    &sg_idp->channel);
 910                         __put_user((int) sdp->device->id, &sg_idp->scsi_id);
 911                         __put_user((int) sdp->device->lun, &sg_idp->lun);
 912                         __put_user((int) sdp->device->type, &sg_idp->scsi_type);
 913                         __put_user((short) sdp->device->host->cmd_per_lun,
 914                                    &sg_idp->h_cmd_per_lun);
 915                         __put_user((short) sdp->device->queue_depth,
 916                                    &sg_idp->d_queue_depth);
 917                         __put_user(0, &sg_idp->unused[0]);
 918                         __put_user(0, &sg_idp->unused[1]);
 919                         return 0;
 920                 }
 921         case SG_SET_FORCE_PACK_ID:
 922                 result = get_user(val, ip);
 923                 if (result)
 924                         return result;
 925                 sfp->force_packid = val ? 1 : 0;
 926                 return 0;
 927         case SG_GET_PACK_ID:
 928                 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
 929                         return -EFAULT;
 930                 read_lock_irqsave(&sfp->rq_list_lock, iflags);
 931                 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
 932                         if ((1 == srp->done) && (!srp->sg_io_owned)) {
 933                                 read_unlock_irqrestore(&sfp->rq_list_lock,
 934                                                        iflags);
 935                                 __put_user(srp->header.pack_id, ip);
 936                                 return 0;
 937                         }
 938                 }
 939                 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
 940                 __put_user(-1, ip);
 941                 return 0;
 942         case SG_GET_NUM_WAITING:
 943                 read_lock_irqsave(&sfp->rq_list_lock, iflags);
 944                 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
 945                         if ((1 == srp->done) && (!srp->sg_io_owned))
 946                                 ++val;
 947                 }
 948                 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
 949                 return put_user(val, ip);
 950         case SG_GET_SG_TABLESIZE:
 951                 return put_user(sdp->sg_tablesize, ip);
 952         case SG_SET_RESERVED_SIZE:
 953                 result = get_user(val, ip);
 954                 if (result)
 955                         return result;
 956                 if (val < 0)
 957                         return -EINVAL;
 958                 val = min_t(int, val,
 959                                 sdp->device->request_queue->max_sectors * 512);
 960                 if (val != sfp->reserve.bufflen) {
 961                         if (sg_res_in_use(sfp) || sfp->mmap_called)
 962                                 return -EBUSY;
 963                         sg_remove_scat(&sfp->reserve);
 964                         sg_build_reserve(sfp, val);
 965                 }
 966                 return 0;
 967         case SG_GET_RESERVED_SIZE:
 968                 val = min_t(int, sfp->reserve.bufflen,
 969                                 sdp->device->request_queue->max_sectors * 512);
 970                 return put_user(val, ip);
 971         case SG_SET_COMMAND_Q:
 972                 result = get_user(val, ip);
 973                 if (result)
 974                         return result;
 975                 sfp->cmd_q = val ? 1 : 0;
 976                 return 0;
 977         case SG_GET_COMMAND_Q:
 978                 return put_user((int) sfp->cmd_q, ip);
 979         case SG_SET_KEEP_ORPHAN:
 980                 result = get_user(val, ip);
 981                 if (result)
 982                         return result;
 983                 sfp->keep_orphan = val;
 984                 return 0;
 985         case SG_GET_KEEP_ORPHAN:
 986                 return put_user((int) sfp->keep_orphan, ip);
 987         case SG_NEXT_CMD_LEN:
 988                 result = get_user(val, ip);
 989                 if (result)
 990                         return result;
 991                 sfp->next_cmd_len = (val > 0) ? val : 0;
 992                 return 0;
 993         case SG_GET_VERSION_NUM:
 994                 return put_user(sg_version_num, ip);
 995         case SG_GET_ACCESS_COUNT:
 996                 /* faked - we don't have a real access count anymore */
 997                 val = (sdp->device ? 1 : 0);
 998                 return put_user(val, ip);
 999         case SG_GET_REQUEST_TABLE:
1000                 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1001                         return -EFAULT;
1002                 else {
1003                         sg_req_info_t *rinfo;
1004                         unsigned int ms;
1005
1006                         rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1007                                                                 GFP_KERNEL);
1008                         if (!rinfo)
1009                                 return -ENOMEM;
1010                         read_lock_irqsave(&sfp->rq_list_lock, iflags);
1011                         for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1012                              ++val, srp = srp ? srp->nextrp : srp) {
1013                                 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1014                                 if (srp) {
1015                                         rinfo[val].req_state = srp->done + 1;
1016                                         rinfo[val].problem =
1017                                             srp->header.masked_status &
1018                                             srp->header.host_status &
1019                                             srp->header.driver_status;
1020                                         if (srp->done)
1021                                                 rinfo[val].duration =
1022                                                         srp->header.duration;
1023                                         else {
1024                                                 ms = jiffies_to_msecs(jiffies);
1025                                                 rinfo[val].duration =
1026                                                     (ms > srp->header.duration) ?
1027                                                     (ms - srp->header.duration) : 0;
1028                                         }
1029                                         rinfo[val].orphan = srp->orphan;
1030                                         rinfo[val].sg_io_owned =
1031                                                         srp->sg_io_owned;
1032                                         rinfo[val].pack_id =
1033                                                         srp->header.pack_id;
1034                                         rinfo[val].usr_ptr =
1035                                                         srp->header.usr_ptr;
1036                                 }
1037                         }
1038                         read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1039                         result = __copy_to_user(p, rinfo,
1040                                                 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1041                         result = result ? -EFAULT : 0;
1042                         kfree(rinfo);
1043                         return result;
1044                 }
1045         case SG_EMULATED_HOST:
1046                 if (sdp->detached)
1047                         return -ENODEV;
1048                 return put_user(sdp->device->host->hostt->emulated, ip);
1049         case SG_SCSI_RESET:
1050                 if (sdp->detached)
1051                         return -ENODEV;
1052                 if (filp->f_flags & O_NONBLOCK) {
1053                         if (scsi_host_in_recovery(sdp->device->host))
1054                                 return -EBUSY;
1055                 } else if (!scsi_block_when_processing_errors(sdp->device))
1056                         return -EBUSY;
1057                 result = get_user(val, ip);
1058                 if (result)
1059                         return result;
1060                 if (SG_SCSI_RESET_NOTHING == val)
1061                         return 0;
1062                 switch (val) {
1063                 case SG_SCSI_RESET_DEVICE:
1064                         val = SCSI_TRY_RESET_DEVICE;
1065                         break;
1066                 case SG_SCSI_RESET_TARGET:
1067                         val = SCSI_TRY_RESET_TARGET;
1068                         break;
1069                 case SG_SCSI_RESET_BUS:
1070                         val = SCSI_TRY_RESET_BUS;
1071                         break;
1072                 case SG_SCSI_RESET_HOST:
1073                         val = SCSI_TRY_RESET_HOST;
1074                         break;
1075                 default:
1076                         return -EINVAL;
1077                 }
1078                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1079                         return -EACCES;
1080                 return (scsi_reset_provider(sdp->device, val) ==
1081                         SUCCESS) ? 0 : -EIO;
1082         case SCSI_IOCTL_SEND_COMMAND:
1083                 if (sdp->detached)
1084                         return -ENODEV;
1085                 if (read_only) {
1086                         unsigned char opcode = WRITE_6;
1087                         Scsi_Ioctl_Command __user *siocp = p;
1088
1089                         if (copy_from_user(&opcode, siocp->data, 1))
1090                                 return -EFAULT;
1091                         if (sg_allow_access(filp, &opcode))
1092                                 return -EPERM;
1093                 }
1094                 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
1095         case SG_SET_DEBUG:
1096                 result = get_user(val, ip);
1097                 if (result)
1098                         return result;
1099                 sdp->sgdebug = (char) val;
1100                 return 0;
1101         case SCSI_IOCTL_GET_IDLUN:
1102         case SCSI_IOCTL_GET_BUS_NUMBER:
1103         case SCSI_IOCTL_PROBE_HOST:
1104         case SG_GET_TRANSFORM:
1105                 if (sdp->detached)
1106                         return -ENODEV;
1107                 return scsi_ioctl(sdp->device, cmd_in, p);
1108         case BLKSECTGET:
1109                 return put_user(sdp->device->request_queue->max_sectors * 512,
1110                                 ip);
1111         case BLKTRACESETUP:
1112                 return blk_trace_setup(sdp->device->request_queue,
1113                                        sdp->disk->disk_name,
1114                                        sdp->device->sdev_gendev.devt,
1115                                        (char *)arg);
1116         case BLKTRACESTART:
1117                 return blk_trace_startstop(sdp->device->request_queue, 1);
1118         case BLKTRACESTOP:
1119                 return blk_trace_startstop(sdp->device->request_queue, 0);
1120         case BLKTRACETEARDOWN:
1121                 return blk_trace_remove(sdp->device->request_queue);
1122         default:
1123                 if (read_only)
1124                         return -EPERM;  /* don't know so take safe approach */
1125                 return scsi_ioctl(sdp->device, cmd_in, p);
1126         }
1127 }
1128
1129 #ifdef CONFIG_COMPAT
1130 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1131 {
1132         Sg_device *sdp;
1133         Sg_fd *sfp;
1134         struct scsi_device *sdev;
1135
1136         if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1137                 return -ENXIO;
1138
1139         sdev = sdp->device;
1140         if (sdev->host->hostt->compat_ioctl) {
1141                 int ret;
1142
1143                 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1144
1145                 return ret;
1146         }
1147
1148         return -ENOIOCTLCMD;
1149 }
1150 #endif
1151
1152 static unsigned int
1153 sg_poll(struct file *filp, poll_table * wait)
1154 {
1155         unsigned int res = 0;
1156         Sg_device *sdp;
1157         Sg_fd *sfp;
1158         Sg_request *srp;
1159         int count = 0;
1160         unsigned long iflags;
1161
1162         if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1163             || sfp->closed)
1164                 return POLLERR;
1165         poll_wait(filp, &sfp->read_wait, wait);
1166         read_lock_irqsave(&sfp->rq_list_lock, iflags);
1167         for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1168                 /* if any read waiting, flag it */
1169                 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1170                         res = POLLIN | POLLRDNORM;
1171                 ++count;
1172         }
1173         read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1174
1175         if (sdp->detached)
1176                 res |= POLLHUP;
1177         else if (!sfp->cmd_q) {
1178                 if (0 == count)
1179                         res |= POLLOUT | POLLWRNORM;
1180         } else if (count < SG_MAX_QUEUE)
1181                 res |= POLLOUT | POLLWRNORM;
1182         SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1183                                    sdp->disk->disk_name, (int) res));
1184         return res;
1185 }
1186
1187 static int
1188 sg_fasync(int fd, struct file *filp, int mode)
1189 {
1190         int retval;
1191         Sg_device *sdp;
1192         Sg_fd *sfp;
1193
1194         if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1195                 return -ENXIO;
1196         SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1197                                    sdp->disk->disk_name, mode));
1198
1199         retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1200         return (retval < 0) ? retval : 0;
1201 }
1202
1203 static int
1204 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1205 {
1206         Sg_fd *sfp;
1207         unsigned long offset, len, sa;
1208         Sg_scatter_hold *rsv_schp;
1209         struct scatterlist *sg;
1210         int k;
1211
1212         if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1213                 return VM_FAULT_SIGBUS;
1214         rsv_schp = &sfp->reserve;
1215         offset = vmf->pgoff << PAGE_SHIFT;
1216         if (offset >= rsv_schp->bufflen)
1217                 return VM_FAULT_SIGBUS;
1218         SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1219                                    offset, rsv_schp->k_use_sg));
1220         sg = rsv_schp->buffer;
1221         sa = vma->vm_start;
1222         for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1223              ++k, sg = sg_next(sg)) {
1224                 len = vma->vm_end - sa;
1225                 len = (len < sg->length) ? len : sg->length;
1226                 if (offset < len) {
1227                         struct page *page;
1228                         page = virt_to_page(page_address(sg_page(sg)) + offset);
1229                         get_page(page); /* increment page count */
1230                         vmf->page = page;
1231                         return 0; /* success */
1232                 }
1233                 sa += len;
1234                 offset -= len;
1235         }
1236
1237         return VM_FAULT_SIGBUS;
1238 }
1239
1240 static struct vm_operations_struct sg_mmap_vm_ops = {
1241         .fault = sg_vma_fault,
1242 };
1243
1244 static int
1245 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1246 {
1247         Sg_fd *sfp;
1248         unsigned long req_sz, len, sa;
1249         Sg_scatter_hold *rsv_schp;
1250         int k;
1251         struct scatterlist *sg;
1252
1253         if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1254                 return -ENXIO;
1255         req_sz = vma->vm_end - vma->vm_start;
1256         SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1257                                    (void *) vma->vm_start, (int) req_sz));
1258         if (vma->vm_pgoff)
1259                 return -EINVAL; /* want no offset */
1260         rsv_schp = &sfp->reserve;
1261         if (req_sz > rsv_schp->bufflen)
1262                 return -ENOMEM; /* cannot map more than reserved buffer */
1263
1264         sa = vma->vm_start;
1265         sg = rsv_schp->buffer;
1266         for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1267              ++k, sg = sg_next(sg)) {
1268                 len = vma->vm_end - sa;
1269                 len = (len < sg->length) ? len : sg->length;
1270                 sa += len;
1271         }
1272
1273         sfp->mmap_called = 1;
1274         vma->vm_flags |= VM_RESERVED;
1275         vma->vm_private_data = sfp;
1276         vma->vm_ops = &sg_mmap_vm_ops;
1277         return 0;
1278 }
1279
1280 /* This function is a "bottom half" handler that is called by the
1281  * mid level when a command is completed (or has failed). */
1282 static void
1283 sg_cmd_done(void *data, char *sense, int result, int resid)
1284 {
1285         Sg_request *srp = data;
1286         Sg_device *sdp = NULL;
1287         Sg_fd *sfp;
1288         unsigned long iflags;
1289         unsigned int ms;
1290
1291         if (NULL == srp) {
1292                 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1293                 return;
1294         }
1295         sfp = srp->parentfp;
1296         if (sfp)
1297                 sdp = sfp->parentdp;
1298         if ((NULL == sdp) || sdp->detached) {
1299                 printk(KERN_INFO "sg_cmd_done: device detached\n");
1300                 return;
1301         }
1302
1303
1304         SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1305                 sdp->disk->disk_name, srp->header.pack_id, result));
1306         srp->header.resid = resid;
1307         ms = jiffies_to_msecs(jiffies);
1308         srp->header.duration = (ms > srp->header.duration) ?
1309                                 (ms - srp->header.duration) : 0;
1310         if (0 != result) {
1311                 struct scsi_sense_hdr sshdr;
1312
1313                 memcpy(srp->sense_b, sense, sizeof (srp->sense_b));
1314                 srp->header.status = 0xff & result;
1315                 srp->header.masked_status = status_byte(result);
1316                 srp->header.msg_status = msg_byte(result);
1317                 srp->header.host_status = host_byte(result);
1318                 srp->header.driver_status = driver_byte(result);
1319                 if ((sdp->sgdebug > 0) &&
1320                     ((CHECK_CONDITION == srp->header.masked_status) ||
1321                      (COMMAND_TERMINATED == srp->header.masked_status)))
1322                         __scsi_print_sense("sg_cmd_done", sense,
1323                                            SCSI_SENSE_BUFFERSIZE);
1324
1325                 /* Following if statement is a patch supplied by Eric Youngdale */
1326                 if (driver_byte(result) != 0
1327                     && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1328                     && !scsi_sense_is_deferred(&sshdr)
1329                     && sshdr.sense_key == UNIT_ATTENTION
1330                     && sdp->device->removable) {
1331                         /* Detected possible disc change. Set the bit - this */
1332                         /* may be used if there are filesystems using this device */
1333                         sdp->device->changed = 1;
1334                 }
1335         }
1336         /* Rely on write phase to clean out srp status values, so no "else" */
1337
1338         if (sfp->closed) {      /* whoops this fd already released, cleanup */
1339                 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1340                 sg_finish_rem_req(srp);
1341                 srp = NULL;
1342                 if (NULL == sfp->headrp) {
1343                         SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
1344                         if (0 == sg_remove_sfp(sdp, sfp)) {     /* device still present */
1345                                 scsi_device_put(sdp->device);
1346                         }
1347                         sfp = NULL;
1348                 }
1349         } else if (srp && srp->orphan) {
1350                 if (sfp->keep_orphan)
1351                         srp->sg_io_owned = 0;
1352                 else {
1353                         sg_finish_rem_req(srp);
1354                         srp = NULL;
1355                 }
1356         }
1357         if (sfp && srp) {
1358                 /* Now wake up any sg_read() that is waiting for this packet. */
1359                 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1360                 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1361                 srp->done = 1;
1362                 wake_up_interruptible(&sfp->read_wait);
1363                 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1364         }
1365 }
1366
1367 static struct file_operations sg_fops = {
1368         .owner = THIS_MODULE,
1369         .read = sg_read,
1370         .write = sg_write,
1371         .poll = sg_poll,
1372         .ioctl = sg_ioctl,
1373 #ifdef CONFIG_COMPAT
1374         .compat_ioctl = sg_compat_ioctl,
1375 #endif
1376         .open = sg_open,
1377         .mmap = sg_mmap,
1378         .release = sg_release,
1379         .fasync = sg_fasync,
1380 };
1381
1382 static struct class *sg_sysfs_class;
1383
1384 static int sg_sysfs_valid = 0;
1385
1386 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1387 {
1388         struct request_queue *q = scsidp->request_queue;
1389         Sg_device *sdp;
1390         unsigned long iflags;
1391         int error;
1392         u32 k;
1393
1394         sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1395         if (!sdp) {
1396                 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1397                 return ERR_PTR(-ENOMEM);
1398         }
1399         error = -ENOMEM;
1400         if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1401                 printk(KERN_WARNING "idr expansion Sg_device failure\n");
1402                 goto out;
1403         }
1404
1405         write_lock_irqsave(&sg_index_lock, iflags);
1406         error = idr_get_new(&sg_index_idr, sdp, &k);
1407         write_unlock_irqrestore(&sg_index_lock, iflags);
1408
1409         if (error) {
1410                 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1411                        error);
1412                 goto out;
1413         }
1414
1415         if (unlikely(k >= SG_MAX_DEVS))
1416                 goto overflow;
1417
1418         SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1419         sprintf(disk->disk_name, "sg%d", k);
1420         disk->first_minor = k;
1421         sdp->disk = disk;
1422         sdp->device = scsidp;
1423         init_waitqueue_head(&sdp->o_excl_wait);
1424         sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
1425         sdp->index = k;
1426
1427         error = 0;
1428  out:
1429         if (error) {
1430                 kfree(sdp);
1431                 return ERR_PTR(error);
1432         }
1433         return sdp;
1434
1435  overflow:
1436         sdev_printk(KERN_WARNING, scsidp,
1437                     "Unable to attach sg device type=%d, minor "
1438                     "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1439         error = -ENODEV;
1440         goto out;
1441 }
1442
1443 static int
1444 sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1445 {
1446         struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1447         struct gendisk *disk;
1448         Sg_device *sdp = NULL;
1449         struct cdev * cdev = NULL;
1450         int error;
1451         unsigned long iflags;
1452
1453         disk = alloc_disk(1);
1454         if (!disk) {
1455                 printk(KERN_WARNING "alloc_disk failed\n");
1456                 return -ENOMEM;
1457         }
1458         disk->major = SCSI_GENERIC_MAJOR;
1459
1460         error = -ENOMEM;
1461         cdev = cdev_alloc();
1462         if (!cdev) {
1463                 printk(KERN_WARNING "cdev_alloc failed\n");
1464                 goto out;
1465         }
1466         cdev->owner = THIS_MODULE;
1467         cdev->ops = &sg_fops;
1468
1469         sdp = sg_alloc(disk, scsidp);
1470         if (IS_ERR(sdp)) {
1471                 printk(KERN_WARNING "sg_alloc failed\n");
1472                 error = PTR_ERR(sdp);
1473                 goto out;
1474         }
1475
1476         error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1477         if (error)
1478                 goto cdev_add_err;
1479
1480         sdp->cdev = cdev;
1481         if (sg_sysfs_valid) {
1482                 struct device *sg_class_member;
1483
1484                 sg_class_member = device_create_drvdata(sg_sysfs_class,
1485                                                         cl_dev->parent,
1486                                                         MKDEV(SCSI_GENERIC_MAJOR,
1487                                                               sdp->index),
1488                                                         sdp,
1489                                                         "%s", disk->disk_name);
1490                 if (IS_ERR(sg_class_member)) {
1491                         printk(KERN_ERR "sg_add: "
1492                                "device_create failed\n");
1493                         error = PTR_ERR(sg_class_member);
1494                         goto cdev_add_err;
1495                 }
1496                 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1497                                           &sg_class_member->kobj, "generic");
1498                 if (error)
1499                         printk(KERN_ERR "sg_add: unable to make symlink "
1500                                         "'generic' back to sg%d\n", sdp->index);
1501         } else
1502                 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1503
1504         sdev_printk(KERN_NOTICE, scsidp,
1505                     "Attached scsi generic sg%d type %d\n", sdp->index,
1506                     scsidp->type);
1507
1508         dev_set_drvdata(cl_dev, sdp);
1509
1510         return 0;
1511
1512 cdev_add_err:
1513         write_lock_irqsave(&sg_index_lock, iflags);
1514         idr_remove(&sg_index_idr, sdp->index);
1515         write_unlock_irqrestore(&sg_index_lock, iflags);
1516         kfree(sdp);
1517
1518 out:
1519         put_disk(disk);
1520         if (cdev)
1521                 cdev_del(cdev);
1522         return error;
1523 }
1524
1525 static void
1526 sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1527 {
1528         struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1529         Sg_device *sdp = dev_get_drvdata(cl_dev);
1530         unsigned long iflags;
1531         Sg_fd *sfp;
1532         Sg_fd *tsfp;
1533         Sg_request *srp;
1534         Sg_request *tsrp;
1535         int delay;
1536
1537         if (!sdp)
1538                 return;
1539
1540         delay = 0;
1541         write_lock_irqsave(&sg_index_lock, iflags);
1542         if (sdp->headfp) {
1543                 sdp->detached = 1;
1544                 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1545                         tsfp = sfp->nextfp;
1546                         for (srp = sfp->headrp; srp; srp = tsrp) {
1547                                 tsrp = srp->nextrp;
1548                                 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1549                                         sg_finish_rem_req(srp);
1550                         }
1551                         if (sfp->closed) {
1552                                 scsi_device_put(sdp->device);
1553                                 __sg_remove_sfp(sdp, sfp);
1554                         } else {
1555                                 delay = 1;
1556                                 wake_up_interruptible(&sfp->read_wait);
1557                                 kill_fasync(&sfp->async_qp, SIGPOLL,
1558                                             POLL_HUP);
1559                         }
1560                 }
1561                 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index));
1562                 if (NULL == sdp->headfp) {
1563                         idr_remove(&sg_index_idr, sdp->index);
1564                 }
1565         } else {        /* nothing active, simple case */
1566                 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index));
1567                 idr_remove(&sg_index_idr, sdp->index);
1568         }
1569         write_unlock_irqrestore(&sg_index_lock, iflags);
1570
1571         sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1572         device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1573         cdev_del(sdp->cdev);
1574         sdp->cdev = NULL;
1575         put_disk(sdp->disk);
1576         sdp->disk = NULL;
1577         if (NULL == sdp->headfp)
1578                 kfree(sdp);
1579
1580         if (delay)
1581                 msleep(10);     /* dirty detach so delay device destruction */
1582 }
1583
1584 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1585 module_param_named(def_reserved_size, def_reserved_size, int,
1586                    S_IRUGO | S_IWUSR);
1587 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1588
1589 MODULE_AUTHOR("Douglas Gilbert");
1590 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1591 MODULE_LICENSE("GPL");
1592 MODULE_VERSION(SG_VERSION_STR);
1593 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1594
1595 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1596                 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1597 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1598 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1599
1600 static int __init
1601 init_sg(void)
1602 {
1603         int rc;
1604
1605         if (scatter_elem_sz < PAGE_SIZE) {
1606                 scatter_elem_sz = PAGE_SIZE;
1607                 scatter_elem_sz_prev = scatter_elem_sz;
1608         }
1609         if (def_reserved_size >= 0)
1610                 sg_big_buff = def_reserved_size;
1611         else
1612                 def_reserved_size = sg_big_buff;
1613
1614         rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1615                                     SG_MAX_DEVS, "sg");
1616         if (rc)
1617                 return rc;
1618         sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1619         if ( IS_ERR(sg_sysfs_class) ) {
1620                 rc = PTR_ERR(sg_sysfs_class);
1621                 goto err_out;
1622         }
1623         sg_sysfs_valid = 1;
1624         rc = scsi_register_interface(&sg_interface);
1625         if (0 == rc) {
1626 #ifdef CONFIG_SCSI_PROC_FS
1627                 sg_proc_init();
1628 #endif                          /* CONFIG_SCSI_PROC_FS */
1629                 return 0;
1630         }
1631         class_destroy(sg_sysfs_class);
1632 err_out:
1633         unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1634         return rc;
1635 }
1636
1637 static void __exit
1638 exit_sg(void)
1639 {
1640 #ifdef CONFIG_SCSI_PROC_FS
1641         sg_proc_cleanup();
1642 #endif                          /* CONFIG_SCSI_PROC_FS */
1643         scsi_unregister_interface(&sg_interface);
1644         class_destroy(sg_sysfs_class);
1645         sg_sysfs_valid = 0;
1646         unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1647                                  SG_MAX_DEVS);
1648         idr_destroy(&sg_index_idr);
1649 }
1650
1651 static int __sg_start_req(struct sg_request *srp, struct sg_io_hdr *hp,
1652                           unsigned char *cmd)
1653 {
1654         struct sg_fd *sfp = srp->parentfp;
1655         struct request_queue *q = sfp->parentdp->device->request_queue;
1656         struct request *rq;
1657         int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1658
1659         rq = blk_get_request(q, rw, GFP_ATOMIC);
1660         if (!rq)
1661                 return -ENOMEM;
1662
1663         memcpy(rq->cmd, cmd, hp->cmd_len);
1664
1665         rq->cmd_len = hp->cmd_len;
1666         rq->cmd_type = REQ_TYPE_BLOCK_PC;
1667
1668         srp->rq = rq;
1669         rq->end_io_data = srp;
1670         rq->sense = srp->sense_b;
1671         rq->retries = SG_DEFAULT_RETRIES;
1672
1673         return 0;
1674 }
1675
1676 static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1677 {
1678         int res;
1679         Sg_fd *sfp = srp->parentfp;
1680         sg_io_hdr_t *hp = &srp->header;
1681         int dxfer_len = (int) hp->dxfer_len;
1682         int dxfer_dir = hp->dxfer_direction;
1683         unsigned long uaddr = (unsigned long)hp->dxferp;
1684         Sg_scatter_hold *req_schp = &srp->data;
1685         Sg_scatter_hold *rsv_schp = &sfp->reserve;
1686         struct request_queue *q = sfp->parentdp->device->request_queue;
1687         unsigned long alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1688
1689         SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1690
1691         if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1692                 return __sg_start_req(srp, hp, cmd);
1693
1694 #ifdef SG_ALLOW_DIO_CODE
1695         if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1696             (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1697             (!sfp->parentdp->device->host->unchecked_isa_dma) &&
1698             !(uaddr & alignment) && !(dxfer_len & alignment)) {
1699                 res = __sg_start_req(srp, hp, cmd);
1700                 if (!res)
1701                         res = sg_build_direct(srp, sfp, dxfer_len);
1702
1703                 return res;
1704         }
1705 #endif
1706         if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1707                 sg_link_reserve(sfp, srp, dxfer_len);
1708         else {
1709                 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1710                 if (res) {
1711                         sg_remove_scat(req_schp);
1712                         return res;
1713                 }
1714         }
1715         return 0;
1716 }
1717
1718 static void
1719 sg_finish_rem_req(Sg_request * srp)
1720 {
1721         Sg_fd *sfp = srp->parentfp;
1722         Sg_scatter_hold *req_schp = &srp->data;
1723
1724         SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1725         if (srp->res_used)
1726                 sg_unlink_reserve(sfp, srp);
1727         else
1728                 sg_remove_scat(req_schp);
1729
1730         if (srp->rq) {
1731                 if (srp->bio)
1732                         blk_rq_unmap_user(srp->bio);
1733                 blk_put_request(srp->rq);
1734         }
1735
1736         sg_remove_request(sfp, srp);
1737 }
1738
1739 static int
1740 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1741 {
1742         int sg_bufflen = tablesize * sizeof(struct scatterlist);
1743         gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1744
1745         /*
1746          * TODO: test without low_dma, we should not need it since
1747          * the block layer will bounce the buffer for us
1748          *
1749          * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
1750          */
1751         if (sfp->low_dma)
1752                  gfp_flags |= GFP_DMA;
1753         schp->buffer = kzalloc(sg_bufflen, gfp_flags);
1754         if (!schp->buffer)
1755                 return -ENOMEM;
1756         sg_init_table(schp->buffer, tablesize);
1757         schp->sglist_len = sg_bufflen;
1758         return tablesize;       /* number of scat_gath elements allocated */
1759 }
1760
1761 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1762 static int
1763 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1764 {
1765         sg_io_hdr_t *hp = &srp->header;
1766         Sg_scatter_hold *schp = &srp->data;
1767         int res;
1768         struct request *rq = srp->rq;
1769         struct request_queue *q = sfp->parentdp->device->request_queue;
1770
1771         res = blk_rq_map_user(q, rq, NULL, hp->dxferp, dxfer_len, GFP_ATOMIC);
1772         if (res)
1773                 return res;
1774         srp->bio = rq->bio;
1775         schp->dio_in_use = 1;
1776         hp->info |= SG_INFO_DIRECT_IO;
1777         return 0;
1778 }
1779
1780 static int
1781 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1782 {
1783         struct scatterlist *sg;
1784         int ret_sz = 0, k, rem_sz, num, mx_sc_elems;
1785         int sg_tablesize = sfp->parentdp->sg_tablesize;
1786         int blk_size = buff_size;
1787         struct page *p = NULL;
1788
1789         if (blk_size < 0)
1790                 return -EFAULT;
1791         if (0 == blk_size)
1792                 ++blk_size;     /* don't know why */
1793 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1794         blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1795         SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1796                                    buff_size, blk_size));
1797
1798         /* N.B. ret_sz carried into this block ... */
1799         mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1800         if (mx_sc_elems < 0)
1801                 return mx_sc_elems;     /* most likely -ENOMEM */
1802
1803         num = scatter_elem_sz;
1804         if (unlikely(num != scatter_elem_sz_prev)) {
1805                 if (num < PAGE_SIZE) {
1806                         scatter_elem_sz = PAGE_SIZE;
1807                         scatter_elem_sz_prev = PAGE_SIZE;
1808                 } else
1809                         scatter_elem_sz_prev = num;
1810         }
1811         for (k = 0, sg = schp->buffer, rem_sz = blk_size;
1812              (rem_sz > 0) && (k < mx_sc_elems);
1813              ++k, rem_sz -= ret_sz, sg = sg_next(sg)) {
1814
1815                 num = (rem_sz > scatter_elem_sz_prev) ?
1816                       scatter_elem_sz_prev : rem_sz;
1817                 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1818                 if (!p)
1819                         return -ENOMEM;
1820
1821                 if (num == scatter_elem_sz_prev) {
1822                         if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1823                                 scatter_elem_sz = ret_sz;
1824                                 scatter_elem_sz_prev = ret_sz;
1825                         }
1826                 }
1827                 sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0);
1828
1829                 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1830                                  "ret_sz=%d\n", k, num, ret_sz));
1831         }               /* end of for loop */
1832
1833         schp->k_use_sg = k;
1834         SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1835                          "rem_sz=%d\n", k, rem_sz));
1836
1837         schp->bufflen = blk_size;
1838         if (rem_sz > 0) /* must have failed */
1839                 return -ENOMEM;
1840
1841         return 0;
1842 }
1843
1844 static int
1845 sg_write_xfer(Sg_request * srp)
1846 {
1847         sg_io_hdr_t *hp = &srp->header;
1848         Sg_scatter_hold *schp = &srp->data;
1849         struct scatterlist *sg = schp->buffer;
1850         int num_xfer = 0;
1851         int j, k, onum, usglen, ksglen, res;
1852         int iovec_count = (int) hp->iovec_count;
1853         int dxfer_dir = hp->dxfer_direction;
1854         unsigned char *p;
1855         unsigned char __user *up;
1856         int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1857
1858         if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1859             (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1860                 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1861                 if (schp->bufflen < num_xfer)
1862                         num_xfer = schp->bufflen;
1863         }
1864         if ((num_xfer <= 0) || (schp->dio_in_use) ||
1865             (new_interface
1866              && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1867                 return 0;
1868
1869         SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1870                           num_xfer, iovec_count, schp->k_use_sg));
1871         if (iovec_count) {
1872                 onum = iovec_count;
1873                 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
1874                         return -EFAULT;
1875         } else
1876                 onum = 1;
1877
1878         ksglen = sg->length;
1879         p = page_address(sg_page(sg));
1880         for (j = 0, k = 0; j < onum; ++j) {
1881                 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1882                 if (res)
1883                         return res;
1884
1885                 for (; p; sg = sg_next(sg), ksglen = sg->length,
1886                      p = page_address(sg_page(sg))) {
1887                         if (usglen <= 0)
1888                                 break;
1889                         if (ksglen > usglen) {
1890                                 if (usglen >= num_xfer) {
1891                                         if (__copy_from_user(p, up, num_xfer))
1892                                                 return -EFAULT;
1893                                         return 0;
1894                                 }
1895                                 if (__copy_from_user(p, up, usglen))
1896                                         return -EFAULT;
1897                                 p += usglen;
1898                                 ksglen -= usglen;
1899                                 break;
1900                         } else {
1901                                 if (ksglen >= num_xfer) {
1902                                         if (__copy_from_user(p, up, num_xfer))
1903                                                 return -EFAULT;
1904                                         return 0;
1905                                 }
1906                                 if (__copy_from_user(p, up, ksglen))
1907                                         return -EFAULT;
1908                                 up += ksglen;
1909                                 usglen -= ksglen;
1910                         }
1911                         ++k;
1912                         if (k >= schp->k_use_sg)
1913                                 return 0;
1914                 }
1915         }
1916
1917         return 0;
1918 }
1919
1920 static int
1921 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
1922            int wr_xf, int *countp, unsigned char __user **up)
1923 {
1924         int num_xfer = (int) hp->dxfer_len;
1925         unsigned char __user *p = hp->dxferp;
1926         int count;
1927
1928         if (0 == sg_num) {
1929                 if (wr_xf && ('\0' == hp->interface_id))
1930                         count = (int) hp->flags;        /* holds "old" input_size */
1931                 else
1932                         count = num_xfer;
1933         } else {
1934                 sg_iovec_t iovec;
1935                 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
1936                         return -EFAULT;
1937                 p = iovec.iov_base;
1938                 count = (int) iovec.iov_len;
1939         }
1940         if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
1941                 return -EFAULT;
1942         if (up)
1943                 *up = p;
1944         if (countp)
1945                 *countp = count;
1946         return 0;
1947 }
1948
1949 static void
1950 sg_remove_scat(Sg_scatter_hold * schp)
1951 {
1952         SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1953         if (schp->buffer && (schp->sglist_len > 0)) {
1954                 struct scatterlist *sg = schp->buffer;
1955
1956                 if (!schp->dio_in_use) {
1957                         int k;
1958
1959                         for (k = 0; (k < schp->k_use_sg) && sg_page(sg);
1960                              ++k, sg = sg_next(sg)) {
1961                                 SCSI_LOG_TIMEOUT(5, printk(
1962                                     "sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
1963                                     k, sg_page(sg), sg->length));
1964                                 sg_page_free(sg_page(sg), sg->length);
1965                         }
1966
1967                         kfree(schp->buffer);
1968                 }
1969         }
1970         memset(schp, 0, sizeof (*schp));
1971 }
1972
1973 static int
1974 sg_read_xfer(Sg_request * srp)
1975 {
1976         sg_io_hdr_t *hp = &srp->header;
1977         Sg_scatter_hold *schp = &srp->data;
1978         struct scatterlist *sg = schp->buffer;
1979         int num_xfer = 0;
1980         int j, k, onum, usglen, ksglen, res;
1981         int iovec_count = (int) hp->iovec_count;
1982         int dxfer_dir = hp->dxfer_direction;
1983         unsigned char *p;
1984         unsigned char __user *up;
1985         int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1986
1987         if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
1988             || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1989                 num_xfer = hp->dxfer_len;
1990                 if (schp->bufflen < num_xfer)
1991                         num_xfer = schp->bufflen;
1992         }
1993         if ((num_xfer <= 0) || (schp->dio_in_use) ||
1994             (new_interface
1995              && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1996                 return 0;
1997
1998         SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1999                           num_xfer, iovec_count, schp->k_use_sg));
2000         if (iovec_count) {
2001                 onum = iovec_count;
2002                 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2003                         return -EFAULT;
2004         } else
2005                 onum = 1;
2006
2007         p = page_address(sg_page(sg));
2008         ksglen = sg->length;
2009         for (j = 0, k = 0; j < onum; ++j) {
2010                 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2011                 if (res)
2012                         return res;
2013
2014                 for (; p; sg = sg_next(sg), ksglen = sg->length,
2015                      p = page_address(sg_page(sg))) {
2016                         if (usglen <= 0)
2017                                 break;
2018                         if (ksglen > usglen) {
2019                                 if (usglen >= num_xfer) {
2020                                         if (__copy_to_user(up, p, num_xfer))
2021                                                 return -EFAULT;
2022                                         return 0;
2023                                 }
2024                                 if (__copy_to_user(up, p, usglen))
2025                                         return -EFAULT;
2026                                 p += usglen;
2027                                 ksglen -= usglen;
2028                                 break;
2029                         } else {
2030                                 if (ksglen >= num_xfer) {
2031                                         if (__copy_to_user(up, p, num_xfer))
2032                                                 return -EFAULT;
2033                                         return 0;
2034                                 }
2035                                 if (__copy_to_user(up, p, ksglen))
2036                                         return -EFAULT;
2037                                 up += ksglen;
2038                                 usglen -= ksglen;
2039                         }
2040                         ++k;
2041                         if (k >= schp->k_use_sg)
2042                                 return 0;
2043                 }
2044         }
2045
2046         return 0;
2047 }
2048
2049 static int
2050 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2051 {
2052         Sg_scatter_hold *schp = &srp->data;
2053         struct scatterlist *sg = schp->buffer;
2054         int k, num;
2055
2056         SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2057                                    num_read_xfer));
2058         if ((!outp) || (num_read_xfer <= 0))
2059                 return 0;
2060
2061         for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) {
2062                 num = sg->length;
2063                 if (num > num_read_xfer) {
2064                         if (__copy_to_user(outp, page_address(sg_page(sg)),
2065                                            num_read_xfer))
2066                                 return -EFAULT;
2067                         break;
2068                 } else {
2069                         if (__copy_to_user(outp, page_address(sg_page(sg)),
2070                                            num))
2071                                 return -EFAULT;
2072                         num_read_xfer -= num;
2073                         if (num_read_xfer <= 0)
2074                                 break;
2075                         outp += num;
2076                 }
2077         }
2078
2079         return 0;
2080 }
2081
2082 static void
2083 sg_build_reserve(Sg_fd * sfp, int req_size)
2084 {
2085         Sg_scatter_hold *schp = &sfp->reserve;
2086
2087         SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2088         do {
2089                 if (req_size < PAGE_SIZE)
2090                         req_size = PAGE_SIZE;
2091                 if (0 == sg_build_indirect(schp, sfp, req_size))
2092                         return;
2093                 else
2094                         sg_remove_scat(schp);
2095                 req_size >>= 1; /* divide by 2 */
2096         } while (req_size > (PAGE_SIZE / 2));
2097 }
2098
2099 static void
2100 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2101 {
2102         Sg_scatter_hold *req_schp = &srp->data;
2103         Sg_scatter_hold *rsv_schp = &sfp->reserve;
2104         struct scatterlist *sg = rsv_schp->buffer;
2105         int k, num, rem;
2106
2107         srp->res_used = 1;
2108         SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2109         rem = size;
2110
2111         for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) {
2112                 num = sg->length;
2113                 if (rem <= num) {
2114                         sfp->save_scat_len = num;
2115                         sg->length = rem;
2116                         req_schp->k_use_sg = k + 1;
2117                         req_schp->sglist_len = rsv_schp->sglist_len;
2118                         req_schp->buffer = rsv_schp->buffer;
2119
2120                         req_schp->bufflen = size;
2121                         req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2122                         break;
2123                 } else
2124                         rem -= num;
2125         }
2126
2127         if (k >= rsv_schp->k_use_sg)
2128                 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2129 }
2130
2131 static void
2132 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2133 {
2134         Sg_scatter_hold *req_schp = &srp->data;
2135         Sg_scatter_hold *rsv_schp = &sfp->reserve;
2136
2137         SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2138                                    (int) req_schp->k_use_sg));
2139         if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2140                 struct scatterlist *sg = rsv_schp->buffer;
2141
2142                 if (sfp->save_scat_len > 0)
2143                         (sg + (req_schp->k_use_sg - 1))->length =
2144                             (unsigned) sfp->save_scat_len;
2145                 else
2146                         SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2147         }
2148         req_schp->k_use_sg = 0;
2149         req_schp->bufflen = 0;
2150         req_schp->buffer = NULL;
2151         req_schp->sglist_len = 0;
2152         sfp->save_scat_len = 0;
2153         srp->res_used = 0;
2154 }
2155
2156 static Sg_request *
2157 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2158 {
2159         Sg_request *resp;
2160         unsigned long iflags;
2161
2162         write_lock_irqsave(&sfp->rq_list_lock, iflags);
2163         for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2164                 /* look for requests that are ready + not SG_IO owned */
2165                 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2166                     ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2167                         resp->done = 2; /* guard against other readers */
2168                         break;
2169                 }
2170         }
2171         write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2172         return resp;
2173 }
2174
2175 #ifdef CONFIG_SCSI_PROC_FS
2176 static Sg_request *
2177 sg_get_nth_request(Sg_fd * sfp, int nth)
2178 {
2179         Sg_request *resp;
2180         unsigned long iflags;
2181         int k;
2182
2183         read_lock_irqsave(&sfp->rq_list_lock, iflags);
2184         for (k = 0, resp = sfp->headrp; resp && (k < nth);
2185              ++k, resp = resp->nextrp) ;
2186         read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2187         return resp;
2188 }
2189 #endif
2190
2191 /* always adds to end of list */
2192 static Sg_request *
2193 sg_add_request(Sg_fd * sfp)
2194 {
2195         int k;
2196         unsigned long iflags;
2197         Sg_request *resp;
2198         Sg_request *rp = sfp->req_arr;
2199
2200         write_lock_irqsave(&sfp->rq_list_lock, iflags);
2201         resp = sfp->headrp;
2202         if (!resp) {
2203                 memset(rp, 0, sizeof (Sg_request));
2204                 rp->parentfp = sfp;
2205                 resp = rp;
2206                 sfp->headrp = resp;
2207         } else {
2208                 if (0 == sfp->cmd_q)
2209                         resp = NULL;    /* command queuing disallowed */
2210                 else {
2211                         for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2212                                 if (!rp->parentfp)
2213                                         break;
2214                         }
2215                         if (k < SG_MAX_QUEUE) {
2216                                 memset(rp, 0, sizeof (Sg_request));
2217                                 rp->parentfp = sfp;
2218                                 while (resp->nextrp)
2219                                         resp = resp->nextrp;
2220                                 resp->nextrp = rp;
2221                                 resp = rp;
2222                         } else
2223                                 resp = NULL;
2224                 }
2225         }
2226         if (resp) {
2227                 resp->nextrp = NULL;
2228                 resp->header.duration = jiffies_to_msecs(jiffies);
2229         }
2230         write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2231         return resp;
2232 }
2233
2234 /* Return of 1 for found; 0 for not found */
2235 static int
2236 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2237 {
2238         Sg_request *prev_rp;
2239         Sg_request *rp;
2240         unsigned long iflags;
2241         int res = 0;
2242
2243         if ((!sfp) || (!srp) || (!sfp->headrp))
2244                 return res;
2245         write_lock_irqsave(&sfp->rq_list_lock, iflags);
2246         prev_rp = sfp->headrp;
2247         if (srp == prev_rp) {
2248                 sfp->headrp = prev_rp->nextrp;
2249                 prev_rp->parentfp = NULL;
2250                 res = 1;
2251         } else {
2252                 while ((rp = prev_rp->nextrp)) {
2253                         if (srp == rp) {
2254                                 prev_rp->nextrp = rp->nextrp;
2255                                 rp->parentfp = NULL;
2256                                 res = 1;
2257                                 break;
2258                         }
2259                         prev_rp = rp;
2260                 }
2261         }
2262         write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2263         return res;
2264 }
2265
2266 #ifdef CONFIG_SCSI_PROC_FS
2267 static Sg_fd *
2268 sg_get_nth_sfp(Sg_device * sdp, int nth)
2269 {
2270         Sg_fd *resp;
2271         unsigned long iflags;
2272         int k;
2273
2274         read_lock_irqsave(&sg_index_lock, iflags);
2275         for (k = 0, resp = sdp->headfp; resp && (k < nth);
2276              ++k, resp = resp->nextfp) ;
2277         read_unlock_irqrestore(&sg_index_lock, iflags);
2278         return resp;
2279 }
2280 #endif
2281
2282 static Sg_fd *
2283 sg_add_sfp(Sg_device * sdp, int dev)
2284 {
2285         Sg_fd *sfp;
2286         unsigned long iflags;
2287         int bufflen;
2288
2289         sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2290         if (!sfp)
2291                 return NULL;
2292
2293         init_waitqueue_head(&sfp->read_wait);
2294         rwlock_init(&sfp->rq_list_lock);
2295
2296         sfp->timeout = SG_DEFAULT_TIMEOUT;
2297         sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2298         sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2299         sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2300             sdp->device->host->unchecked_isa_dma : 1;
2301         sfp->cmd_q = SG_DEF_COMMAND_Q;
2302         sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2303         sfp->parentdp = sdp;
2304         write_lock_irqsave(&sg_index_lock, iflags);
2305         if (!sdp->headfp)
2306                 sdp->headfp = sfp;
2307         else {                  /* add to tail of existing list */
2308                 Sg_fd *pfp = sdp->headfp;
2309                 while (pfp->nextfp)
2310                         pfp = pfp->nextfp;
2311                 pfp->nextfp = sfp;
2312         }
2313         write_unlock_irqrestore(&sg_index_lock, iflags);
2314         SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2315         if (unlikely(sg_big_buff != def_reserved_size))
2316                 sg_big_buff = def_reserved_size;
2317
2318         bufflen = min_t(int, sg_big_buff,
2319                         sdp->device->request_queue->max_sectors * 512);
2320         sg_build_reserve(sfp, bufflen);
2321         SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp:   bufflen=%d, k_use_sg=%d\n",
2322                            sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2323         return sfp;
2324 }
2325
2326 static void
2327 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2328 {
2329         Sg_fd *fp;
2330         Sg_fd *prev_fp;
2331
2332         prev_fp = sdp->headfp;
2333         if (sfp == prev_fp)
2334                 sdp->headfp = prev_fp->nextfp;
2335         else {
2336                 while ((fp = prev_fp->nextfp)) {
2337                         if (sfp == fp) {
2338                                 prev_fp->nextfp = fp->nextfp;
2339                                 break;
2340                         }
2341                         prev_fp = fp;
2342                 }
2343         }
2344         if (sfp->reserve.bufflen > 0) {
2345                 SCSI_LOG_TIMEOUT(6,
2346                         printk("__sg_remove_sfp:    bufflen=%d, k_use_sg=%d\n",
2347                         (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2348                 sg_remove_scat(&sfp->reserve);
2349         }
2350         sfp->parentdp = NULL;
2351         SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp:    sfp=0x%p\n", sfp));
2352         kfree(sfp);
2353 }
2354
2355 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2356 static int
2357 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2358 {
2359         Sg_request *srp;
2360         Sg_request *tsrp;
2361         int dirty = 0;
2362         int res = 0;
2363
2364         for (srp = sfp->headrp; srp; srp = tsrp) {
2365                 tsrp = srp->nextrp;
2366                 if (sg_srp_done(srp, sfp))
2367                         sg_finish_rem_req(srp);
2368                 else
2369                         ++dirty;
2370         }
2371         if (0 == dirty) {
2372                 unsigned long iflags;
2373
2374                 write_lock_irqsave(&sg_index_lock, iflags);
2375                 __sg_remove_sfp(sdp, sfp);
2376                 if (sdp->detached && (NULL == sdp->headfp)) {
2377                         idr_remove(&sg_index_idr, sdp->index);
2378                         kfree(sdp);
2379                         res = 1;
2380                 }
2381                 write_unlock_irqrestore(&sg_index_lock, iflags);
2382         } else {
2383                 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2384                 /* only bump the access_count if we actually succeeded in
2385                  * throwing another counter on the host module */
2386                 scsi_device_get(sdp->device);   /* XXX: retval ignored? */
2387                 sfp->closed = 1;        /* flag dirty state on this fd */
2388                 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2389                                   dirty));
2390         }
2391         return res;
2392 }
2393
2394 static int
2395 sg_res_in_use(Sg_fd * sfp)
2396 {
2397         const Sg_request *srp;
2398         unsigned long iflags;
2399
2400         read_lock_irqsave(&sfp->rq_list_lock, iflags);
2401         for (srp = sfp->headrp; srp; srp = srp->nextrp)
2402                 if (srp->res_used)
2403                         break;
2404         read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2405         return srp ? 1 : 0;
2406 }
2407
2408 /* The size fetched (value output via retSzp) set when non-NULL return */
2409 static struct page *
2410 sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2411 {
2412         struct page *resp = NULL;
2413         gfp_t page_mask;
2414         int order, a_size;
2415         int resSz;
2416
2417         if ((rqSz <= 0) || (NULL == retSzp))
2418                 return resp;
2419
2420         if (lowDma)
2421                 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN;
2422         else
2423                 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
2424
2425         for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2426              order++, a_size <<= 1) ;
2427         resSz = a_size;         /* rounded up if necessary */
2428         resp = alloc_pages(page_mask, order);
2429         while ((!resp) && order) {
2430                 --order;
2431                 a_size >>= 1;   /* divide by 2, until PAGE_SIZE */
2432                 resp =  alloc_pages(page_mask, order);  /* try half */
2433                 resSz = a_size;
2434         }
2435         if (resp) {
2436                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2437                         memset(page_address(resp), 0, resSz);
2438                 *retSzp = resSz;
2439         }
2440         return resp;
2441 }
2442
2443 static void
2444 sg_page_free(struct page *page, int size)
2445 {
2446         int order, a_size;
2447
2448         if (!page)
2449                 return;
2450         for (order = 0, a_size = PAGE_SIZE; a_size < size;
2451              order++, a_size <<= 1) ;
2452         __free_pages(page, order);
2453 }
2454
2455 #ifdef CONFIG_SCSI_PROC_FS
2456 static int
2457 sg_idr_max_id(int id, void *p, void *data)
2458 {
2459         int *k = data;
2460
2461         if (*k < id)
2462                 *k = id;
2463
2464         return 0;
2465 }
2466
2467 static int
2468 sg_last_dev(void)
2469 {
2470         int k = -1;
2471         unsigned long iflags;
2472
2473         read_lock_irqsave(&sg_index_lock, iflags);
2474         idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2475         read_unlock_irqrestore(&sg_index_lock, iflags);
2476         return k + 1;           /* origin 1 */
2477 }
2478 #endif
2479
2480 static Sg_device *
2481 sg_get_dev(int dev)
2482 {
2483         Sg_device *sdp;
2484         unsigned long iflags;
2485
2486         read_lock_irqsave(&sg_index_lock, iflags);
2487         sdp = idr_find(&sg_index_idr, dev);
2488         read_unlock_irqrestore(&sg_index_lock, iflags);
2489
2490         return sdp;
2491 }
2492
2493 #ifdef CONFIG_SCSI_PROC_FS
2494
2495 static struct proc_dir_entry *sg_proc_sgp = NULL;
2496
2497 static char sg_proc_sg_dirname[] = "scsi/sg";
2498
2499 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2500
2501 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2502 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2503                                   size_t count, loff_t *off);
2504 static struct file_operations adio_fops = {
2505         /* .owner, .read and .llseek added in sg_proc_init() */
2506         .open = sg_proc_single_open_adio,
2507         .write = sg_proc_write_adio,
2508         .release = single_release,
2509 };
2510
2511 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2512 static ssize_t sg_proc_write_dressz(struct file *filp,
2513                 const char __user *buffer, size_t count, loff_t *off);
2514 static struct file_operations dressz_fops = {
2515         .open = sg_proc_single_open_dressz,
2516         .write = sg_proc_write_dressz,
2517         .release = single_release,
2518 };
2519
2520 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2521 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2522 static struct file_operations version_fops = {
2523         .open = sg_proc_single_open_version,
2524         .release = single_release,
2525 };
2526
2527 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2528 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2529 static struct file_operations devhdr_fops = {
2530         .open = sg_proc_single_open_devhdr,
2531         .release = single_release,
2532 };
2533
2534 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2535 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2536 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2537 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2538 static void dev_seq_stop(struct seq_file *s, void *v);
2539 static struct file_operations dev_fops = {
2540         .open = sg_proc_open_dev,
2541         .release = seq_release,
2542 };
2543 static struct seq_operations dev_seq_ops = {
2544         .start = dev_seq_start,
2545         .next  = dev_seq_next,
2546         .stop  = dev_seq_stop,
2547         .show  = sg_proc_seq_show_dev,
2548 };
2549
2550 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2551 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2552 static struct file_operations devstrs_fops = {
2553         .open = sg_proc_open_devstrs,
2554         .release = seq_release,
2555 };
2556 static struct seq_operations devstrs_seq_ops = {
2557         .start = dev_seq_start,
2558         .next  = dev_seq_next,
2559         .stop  = dev_seq_stop,
2560         .show  = sg_proc_seq_show_devstrs,
2561 };
2562
2563 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2564 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2565 static struct file_operations debug_fops = {
2566         .open = sg_proc_open_debug,
2567         .release = seq_release,
2568 };
2569 static struct seq_operations debug_seq_ops = {
2570         .start = dev_seq_start,
2571         .next  = dev_seq_next,
2572         .stop  = dev_seq_stop,
2573         .show  = sg_proc_seq_show_debug,
2574 };
2575
2576
2577 struct sg_proc_leaf {
2578         const char * name;
2579         struct file_operations * fops;
2580 };
2581
2582 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2583         {"allow_dio", &adio_fops},
2584         {"debug", &debug_fops},
2585         {"def_reserved_size", &dressz_fops},
2586         {"device_hdr", &devhdr_fops},
2587         {"devices", &dev_fops},
2588         {"device_strs", &devstrs_fops},
2589         {"version", &version_fops}
2590 };
2591
2592 static int
2593 sg_proc_init(void)
2594 {
2595         int k, mask;
2596         int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2597         struct sg_proc_leaf * leaf;
2598
2599         sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2600         if (!sg_proc_sgp)
2601                 return 1;
2602         for (k = 0; k < num_leaves; ++k) {
2603                 leaf = &sg_proc_leaf_arr[k];
2604                 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2605                 leaf->fops->owner = THIS_MODULE;
2606                 leaf->fops->read = seq_read;
2607                 leaf->fops->llseek = seq_lseek;
2608                 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2609         }
2610         return 0;
2611 }
2612
2613 static void
2614 sg_proc_cleanup(void)
2615 {
2616         int k;
2617         int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2618
2619         if (!sg_proc_sgp)
2620                 return;
2621         for (k = 0; k < num_leaves; ++k)
2622                 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2623         remove_proc_entry(sg_proc_sg_dirname, NULL);
2624 }
2625
2626
2627 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2628 {
2629         seq_printf(s, "%d\n", *((int *)s->private));
2630         return 0;
2631 }
2632
2633 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2634 {
2635         return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2636 }
2637
2638 static ssize_t
2639 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2640                    size_t count, loff_t *off)
2641 {
2642         int num;
2643         char buff[11];
2644
2645         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2646                 return -EACCES;
2647         num = (count < 10) ? count : 10;
2648         if (copy_from_user(buff, buffer, num))
2649                 return -EFAULT;
2650         buff[num] = '\0';
2651         sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2652         return count;
2653 }
2654
2655 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2656 {
2657         return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2658 }
2659
2660 static ssize_t
2661 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2662                      size_t count, loff_t *off)
2663 {
2664         int num;
2665         unsigned long k = ULONG_MAX;
2666         char buff[11];
2667
2668         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2669                 return -EACCES;
2670         num = (count < 10) ? count : 10;
2671         if (copy_from_user(buff, buffer, num))
2672                 return -EFAULT;
2673         buff[num] = '\0';
2674         k = simple_strtoul(buff, NULL, 10);
2675         if (k <= 1048576) {     /* limit "big buff" to 1 MB */
2676                 sg_big_buff = k;
2677                 return count;
2678         }
2679         return -ERANGE;
2680 }
2681
2682 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2683 {
2684         seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2685                    sg_version_date);
2686         return 0;
2687 }
2688
2689 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2690 {
2691         return single_open(file, sg_proc_seq_show_version, NULL);
2692 }
2693
2694 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2695 {
2696         seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2697                    "online\n");
2698         return 0;
2699 }
2700
2701 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2702 {
2703         return single_open(file, sg_proc_seq_show_devhdr, NULL);
2704 }
2705
2706 struct sg_proc_deviter {
2707         loff_t  index;
2708         size_t  max;
2709 };
2710
2711 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2712 {
2713         struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2714
2715         s->private = it;
2716         if (! it)
2717                 return NULL;
2718
2719         it->index = *pos;
2720         it->max = sg_last_dev();
2721         if (it->index >= it->max)
2722                 return NULL;
2723         return it;
2724 }
2725
2726 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2727 {
2728         struct sg_proc_deviter * it = s->private;
2729
2730         *pos = ++it->index;
2731         return (it->index < it->max) ? it : NULL;
2732 }
2733
2734 static void dev_seq_stop(struct seq_file *s, void *v)
2735 {
2736         kfree(s->private);
2737 }
2738
2739 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2740 {
2741         return seq_open(file, &dev_seq_ops);
2742 }
2743
2744 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2745 {
2746         struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2747         Sg_device *sdp;
2748         struct scsi_device *scsidp;
2749
2750         sdp = it ? sg_get_dev(it->index) : NULL;
2751         if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2752                 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2753                               scsidp->host->host_no, scsidp->channel,
2754                               scsidp->id, scsidp->lun, (int) scsidp->type,
2755                               1,
2756                               (int) scsidp->queue_depth,
2757                               (int) scsidp->device_busy,
2758                               (int) scsi_device_online(scsidp));
2759         else
2760                 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2761         return 0;
2762 }
2763
2764 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2765 {
2766         return seq_open(file, &devstrs_seq_ops);
2767 }
2768
2769 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2770 {
2771         struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2772         Sg_device *sdp;
2773         struct scsi_device *scsidp;
2774
2775         sdp = it ? sg_get_dev(it->index) : NULL;
2776         if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2777                 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2778                            scsidp->vendor, scsidp->model, scsidp->rev);
2779         else
2780                 seq_printf(s, "<no active device>\n");
2781         return 0;
2782 }
2783
2784 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2785 {
2786         int k, m, new_interface, blen, usg;
2787         Sg_request *srp;
2788         Sg_fd *fp;
2789         const sg_io_hdr_t *hp;
2790         const char * cp;
2791         unsigned int ms;
2792
2793         for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2794                 seq_printf(s, "   FD(%d): timeout=%dms bufflen=%d "
2795                            "(res)sgat=%d low_dma=%d\n", k + 1,
2796                            jiffies_to_msecs(fp->timeout),
2797                            fp->reserve.bufflen,
2798                            (int) fp->reserve.k_use_sg,
2799                            (int) fp->low_dma);
2800                 seq_printf(s, "   cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2801                            (int) fp->cmd_q, (int) fp->force_packid,
2802                            (int) fp->keep_orphan, (int) fp->closed);
2803                 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2804                         hp = &srp->header;
2805                         new_interface = (hp->interface_id == '\0') ? 0 : 1;
2806                         if (srp->res_used) {
2807                                 if (new_interface &&
2808                                     (SG_FLAG_MMAP_IO & hp->flags))
2809                                         cp = "     mmap>> ";
2810                                 else
2811                                         cp = "     rb>> ";
2812                         } else {
2813                                 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2814                                         cp = "     dio>> ";
2815                                 else
2816                                         cp = "     ";
2817                         }
2818                         seq_printf(s, cp);
2819                         blen = srp->data.bufflen;
2820                         usg = srp->data.k_use_sg;
2821                         seq_printf(s, srp->done ?
2822                                    ((1 == srp->done) ?  "rcv:" : "fin:")
2823                                    : "act:");
2824                         seq_printf(s, " id=%d blen=%d",
2825                                    srp->header.pack_id, blen);
2826                         if (srp->done)
2827                                 seq_printf(s, " dur=%d", hp->duration);
2828                         else {
2829                                 ms = jiffies_to_msecs(jiffies);
2830                                 seq_printf(s, " t_o/elap=%d/%d",
2831                                         (new_interface ? hp->timeout :
2832                                                   jiffies_to_msecs(fp->timeout)),
2833                                         (ms > hp->duration ? ms - hp->duration : 0));
2834                         }
2835                         seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2836                                    (int) srp->data.cmd_opcode);
2837                 }
2838                 if (0 == m)
2839                         seq_printf(s, "     No requests active\n");
2840         }
2841 }
2842
2843 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2844 {
2845         return seq_open(file, &debug_seq_ops);
2846 }
2847
2848 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2849 {
2850         struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2851         Sg_device *sdp;
2852
2853         if (it && (0 == it->index)) {
2854                 seq_printf(s, "max_active_device=%d(origin 1)\n",
2855                            (int)it->max);
2856                 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2857         }
2858         sdp = it ? sg_get_dev(it->index) : NULL;
2859         if (sdp) {
2860                 struct scsi_device *scsidp = sdp->device;
2861
2862                 if (NULL == scsidp) {
2863                         seq_printf(s, "device %d detached ??\n",
2864                                    (int)it->index);
2865                         return 0;
2866                 }
2867
2868                 if (sg_get_nth_sfp(sdp, 0)) {
2869                         seq_printf(s, " >>> device=%s ",
2870                                 sdp->disk->disk_name);
2871                         if (sdp->detached)
2872                                 seq_printf(s, "detached pending close ");
2873                         else
2874                                 seq_printf
2875                                     (s, "scsi%d chan=%d id=%d lun=%d   em=%d",
2876                                      scsidp->host->host_no,
2877                                      scsidp->channel, scsidp->id,
2878                                      scsidp->lun,
2879                                      scsidp->host->hostt->emulated);
2880                         seq_printf(s, " sg_tablesize=%d excl=%d\n",
2881                                    sdp->sg_tablesize, sdp->exclude);
2882                 }
2883                 sg_proc_debug_helper(s, sdp);
2884         }
2885         return 0;
2886 }
2887
2888 #endif                          /* CONFIG_SCSI_PROC_FS */
2889
2890 module_init(init_sg);
2891 module_exit(exit_sg);