LCOV - code coverage report
Current view: top level - drivers/scsi - sg.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1443 1535 94.0 %
Date: 2017-01-25 Functions: 58 64 90.6 %

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

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