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