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Date: Tue, 31 Jul 2001 15:38:08 -0700
From: Mike Panetta <mpanetta@applianceware.com>
To: Eric Youngdale <eric@andante.org>
Cc: Richard Gooch <rgooch@ras.ucalgary.ca>, linux-kernel@vger.kernel.org,
        linux-scsi@vger.kernel.org,
        devfs-announce-list@mobilix.ras.ucalgary.ca
Subject: Re: [RFT] Support for ~2144 SCSI discs
Message-ID: <20010731153808.B6638@tetsuo.applianceware.com>
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	Eric Youngdale <eric@andante.org>,
	Richard Gooch <rgooch@ras.ucalgary.ca>,
	linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
	devfs-announce-list@mobilix.ras.ucalgary.ca
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In-Reply-To: <001801c119ca$9fc74750$4d0310ac@fairfax.mkssoftware.com>; from eric@andante.org on Tue, Jul 31, 2001 at 10:10:59AM -0400
Organization: ApplianceWare
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Any maybe target mode?  That would be nice to
have :) Or is it already here?

Mike

On Tue, Jul 31, 2001 at 10:10:59AM -0400, Eric Youngdale wrote:
> 
>     FYI - At some point in the 2.5 series I would like to do some serious
> surgery on the sd datastructures - this will mainly remove load order
> dependencies and eliminate the need for CONFIG_SD_EXTRA.  I believe that
> some of the work that Jens has already started on the blk device layer will
> make support for very large numbers of disks much easier.
> 
> -Eric
> 
> ----- Original Message -----
> From: "Richard Gooch" <rgooch@ras.ucalgary.ca>
> To: <linux-kernel@vger.kernel.org>; <linux-scsi@vger.kernel.org>
> Cc: <devfs-announce-list@mobilix.ras.ucalgary.ca>
> Sent: Monday, July 30, 2001 8:30 PM
> Subject: [RFT] Support for ~2144 SCSI discs
> 
> 
> >   Hi, all. Below is a patch that adds support for large numbers of
> > SCSI discs (approximately 2144). I'd like people to try this out. I'm
> > not doing my normal devfs-patch-v??? thing because this is completely
> > untested (I'm away from my SCSI boxes), and I don't want to put a
> > possibly FS-corrupting patch on my ftp archive. The code does compile
> > and link, though.
> >
> > There are 3 cases I'd like to have tested:
> > - people with 1 to 16 SCSI discs
> > - people with 17 to 128 SCSI discs
> > - people with >128 SCSI discs
> >
> > because each of these exercises a slightly different setup path.
> > Please send success or failure reports to me.
> >
> > REMINDER: be careful with this patch. It could corrupt your FS.
> >
> > Regards,
> >
> > Richard....
> > Permanent: rgooch@atnf.csiro.au
> > Current:   rgooch@ras.ucalgary.ca
> >
> > diff -urN linux-2.4.7/Documentation/Configure.help
> linux/Documentation/Configure.help
> > --- linux-2.4.7/Documentation/Configure.help Thu Jul 19 20:48:15 2001
> > +++ linux/Documentation/Configure.help Mon Jul 23 01:19:24 2001
> > @@ -5410,6 +5410,17 @@
> >    located on a SCSI disk. In this case, do not compile the driver for
> >    your SCSI host adapter (below) as a module either.
> >
> > +Many SCSI Discs support
> > +CONFIG_SD_MANY
> > +  This allows you to support a very large number of SCSI discs
> > +  (approximately 2144). You will also need to set CONFIG_DEVFS_FS=y
> > +  later. This option may consume all unassigned block majors
> > +  (i.e. those which do not have an allocation in
> > +  Documentation/devices.txt). Enabling this will consume a few extra
> > +  kilobytes of kernel memory.
> > +
> > +  Unless you have a large storage array, say N.
> > +
> >  Extra SCSI Disks
> >  CONFIG_SD_EXTRA_DEVS
> >    This controls the amount of additional space allocated in tables for
> > diff -urN linux-2.4.7/Documentation/filesystems/devfs/ChangeLog
> linux/Documentation/filesystems/devfs/ChangeLog
> > --- linux-2.4.7/Documentation/filesystems/devfs/ChangeLog Wed Jul 11
> 17:55:41 2001
> > +++ linux/Documentation/filesystems/devfs/ChangeLog Mon Jul 30 19:13:00
> 2001
> > @@ -1675,3 +1675,13 @@
> >  - Fixed number leak for /dev/cdroms/cdrom%d
> >
> >  - Fixed number leak for /dev/discs/disc%d
> >
> +===========================================================================
> ====
> > +Changes for patch v183
> > +
> > +- Fixed bug in <devfs_setup> which could hang boot process
> >
> +===========================================================================
> ====
> > +Changes for patch v184
> > +
> > +- Support large numbers of SCSI discs (~2144)
> > +
> > +- Documentation typo fix for fs/devfs/util.c
> > diff -urN linux-2.4.7/drivers/scsi/Config.in linux/drivers/scsi/Config.in
> > --- linux-2.4.7/drivers/scsi/Config.in Thu Jul  5 14:28:16 2001
> > +++ linux/drivers/scsi/Config.in Mon Jul 23 01:19:47 2001
> > @@ -3,7 +3,8 @@
> >  dep_tristate '  SCSI disk support' CONFIG_BLK_DEV_SD $CONFIG_SCSI
> >
> >  if [ "$CONFIG_BLK_DEV_SD" != "n" ]; then
> > -   int  'Maximum number of SCSI disks that can be loaded as modules'
> CONFIG_SD_EXTRA_DEVS 40
> > +   bool '    Many (~2144) SCSI discs support (requires devfs)'
> CONFIG_SD_MANY
> > +   int  '    Maximum number of SCSI disks that can be loaded as modules'
> CONFIG_SD_EXTRA_DEVS 40
> >  fi
> >
> >  dep_tristate '  SCSI tape support' CONFIG_CHR_DEV_ST $CONFIG_SCSI
> > diff -urN linux-2.4.7/drivers/scsi/hosts.h linux/drivers/scsi/hosts.h
> > --- linux-2.4.7/drivers/scsi/hosts.h Fri Jul 20 15:55:46 2001
> > +++ linux/drivers/scsi/hosts.h Mon Jul 30 19:20:27 2001
> > @@ -506,9 +506,8 @@
> >      const char * tag;
> >      struct module * module;   /* Used for loadable modules */
> >      unsigned char scsi_type;
> > -    unsigned int major;
> > -    unsigned int min_major;      /* Minimum major in range. */
> > -    unsigned int max_major;      /* Maximum major in range. */
> > +    unsigned int *majors;         /* Array of majors used by driver */
> > +    unsigned int num_majors;      /* Number of majors used by driver */
> >      unsigned int nr_dev;   /* Number currently attached */
> >      unsigned int dev_noticed;   /* Number of devices detected. */
> >      unsigned int dev_max;   /* Current size of arrays */
> > diff -urN linux-2.4.7/drivers/scsi/osst.c linux/drivers/scsi/osst.c
> > --- linux-2.4.7/drivers/scsi/osst.c Fri Jul 20 00:18:15 2001
> > +++ linux/drivers/scsi/osst.c Mon Jul 30 17:57:27 2001
> > @@ -160,7 +160,6 @@
> >         name: "OnStream tape",
> >         tag: "osst",
> >         scsi_type: TYPE_TAPE,
> > -       major: OSST_MAJOR,
> >         detect: osst_detect,
> >         init: osst_init,
> >         attach: osst_attach,
> > diff -urN linux-2.4.7/drivers/scsi/scsi_lib.c
> linux/drivers/scsi/scsi_lib.c
> > --- linux-2.4.7/drivers/scsi/scsi_lib.c Thu Jul 19 23:48:04 2001
> > +++ linux/drivers/scsi/scsi_lib.c Mon Jul 30 17:52:35 2001
> > @@ -769,25 +769,10 @@
> >   * Search for a block device driver that supports this
> >   * major.
> >   */
> > - if (spnt->blk && spnt->major == major) {
> > - return spnt;
> > - }
> > - /*
> > - * I am still not entirely satisfied with this solution,
> > - * but it is good enough for now.  Disks have a number of
> > - * major numbers associated with them, the primary
> > - * 8, which we test above, and a secondary range of 7
> > - * different consecutive major numbers.   If this ever
> > - * becomes insufficient, then we could add another function
> > - * to the structure, and generalize this completely.
> > - */
> > - if( spnt->min_major != 0
> > -     && spnt->max_major != 0
> > -     && major >= spnt->min_major
> > -     && major <= spnt->max_major )
> > - {
> > - return spnt;
> > - }
> > + int i;
> > + if (!spnt->blk || !spnt->majors) continue;
> > + for (i = 0; i < spnt->num_majors; ++i)
> > + if (spnt->majors[i] == major) return spnt;
> >   }
> >   return NULL;
> >  }
> > diff -urN linux-2.4.7/drivers/scsi/sd.c linux/drivers/scsi/sd.c
> > --- linux-2.4.7/drivers/scsi/sd.c Thu Jul  5 14:28:17 2001
> > +++ linux/drivers/scsi/sd.c Mon Jul 30 20:10:58 2001
> > @@ -28,6 +28,8 @@
> >   *
> >   * Modified by Alex Davis <letmein@erols.com>
> >   *       Fix problem where removable media could be ejected after
> sd_open.
> > + *
> > + *       Modified by Richard Gooch rgooch@atnf.csiro.au to support >128
> discs.
> >   */
> >
> >  #include <linux/config.h>
> > @@ -65,7 +67,7 @@
> >   *  static const char RCSid[] = "$Header:";
> >   */
> >
> > -#define SD_MAJOR(i) (!(i) ? SCSI_DISK0_MAJOR : SCSI_DISK1_MAJOR-1+(i))
> > +#define SD_MAJOR(i) sd_template.majors[(i)]
> >
> >  #define SCSI_DISKS_PER_MAJOR 16
> >  #define SD_MAJOR_NUMBER(i) SD_MAJOR((i) >> 8)
> > @@ -108,12 +110,6 @@
> >   name:"disk",
> >   tag:"sd",
> >   scsi_type:TYPE_DISK,
> > - major:SCSI_DISK0_MAJOR,
> > -        /*
> > -         * Secondary range of majors that this driver handles.
> > -         */
> > - min_major:SCSI_DISK1_MAJOR,
> > - max_major:SCSI_DISK7_MAJOR,
> >   blk:1,
> >   detect:sd_detect,
> >   init:sd_init,
> > @@ -123,6 +119,19 @@
> >   init_command:sd_init_command,
> >  };
> >
> > +#ifdef CONFIG_SD_MANY
> > +static inline int sd_devnum_to_index (int devnum)
> > +{
> > +    int i, major = MAJOR (devnum);
> > +
> > +    for (i = 0; i < sd_template.num_majors; ++i)
> > +    {
> > +        if (sd_template.majors[i] != major) continue;
> > +        return (i << 4) | (MINOR (i) >> 4);
> > +    }
> > +    return -ENODEV;
> > +}
> > +#endif
> >
> >  static void rw_intr(Scsi_Cmnd * SCpnt);
> >
> > @@ -1043,6 +1052,41 @@
> >   return i;
> >  }
> >
> > +static int sd_alloc_majors (void)
> > +/*  Allocate as many majors as required
> > + */
> > +{
> > + int i, major;
> > +
> > + if ( ( sd_template.majors =
> > +        kmalloc (sizeof sd_template.majors * N_USED_SD_MAJORS,
> > + GFP_ATOMIC) ) == NULL ) {
> > + printk ("sd.c: unable to allocate major array\n");
> > + return -ENOMEM;
> > + }
> > + sd_template.majors[0] = SCSI_DISK0_MAJOR;
> > + for (i = 1; (i < N_USED_SD_MAJORS) && (i <N_SD_PREASSIGNED_MAJORS);++i)
> > + sd_template.majors[i] = SCSI_DISK1_MAJOR + i - 1;
> > + for (; (i >= N_SD_PREASSIGNED_MAJORS) && (i < N_USED_SD_MAJORS); ++i) {
> > + if ( ( major = devfs_alloc_major (DEVFS_SPECIAL_BLK) ) < 0 )
> > + break;
> > + sd_template.majors[i] = major;
> > + }
> > + sd_template.dev_max = i * SCSI_DISKS_PER_MAJOR;
> > + sd_template.num_majors = i;
> > + return 0;
> > +} /*  End Function sd_alloc_majors  */
> > +
> > +static void sd_dealloc_majors (void)
> > +/*  Deallocate all the allocated majors
> > + */
> > +{
> > + int i;
> > +
> > + for (i = sd_template.num_majors - 1; i >= N_SD_PREASSIGNED_MAJORS; --i)
> > + devfs_dealloc_major (DEVFS_SPECIAL_BLK, sd_template.majors[i]);
> > +} /*  End Function sd_dealloc_majors  */
> > +
> >  /*
> >   * The sd_init() function looks at all SCSI drives present, determines
> >   * their size, and reads partition table entries for them.
> > @@ -1057,16 +1101,16 @@
> >   if (sd_template.dev_noticed == 0)
> >   return 0;
> >
> > - if (!rscsi_disks)
> > + if (!rscsi_disks) {
> >   sd_template.dev_max = sd_template.dev_noticed + SD_EXTRA_DEVS;
> > -
> > - if (sd_template.dev_max > N_SD_MAJORS * SCSI_DISKS_PER_MAJOR)
> > - sd_template.dev_max = N_SD_MAJORS * SCSI_DISKS_PER_MAJOR;
> > + if ( !sd_alloc_majors() ) return 1;
> > + }
> >
> >   if (!sd_registered) {
> >   for (i = 0; i < N_USED_SD_MAJORS; i++) {
> >   if (devfs_register_blkdev(SD_MAJOR(i), "sd", &sd_fops)) {
> >   printk("Unable to get major %d for SCSI disk\n", SD_MAJOR(i));
> > + sd_dealloc_majors();
> >   return 1;
> >   }
> >   }
> > @@ -1166,6 +1210,7 @@
> >   for (i = 0; i < N_USED_SD_MAJORS; i++) {
> >   devfs_unregister_blkdev(SD_MAJOR(i), "sd");
> >   }
> > + sd_dealloc_majors();
> >   sd_registered--;
> >   return 1;
> >  }
> > @@ -1373,6 +1418,7 @@
> >
> >   scsi_unregister_module(MODULE_SCSI_DEV, &sd_template);
> >
> > + sd_dealloc_majors();
> >   for (i = 0; i < N_USED_SD_MAJORS; i++)
> >   devfs_unregister_blkdev(SD_MAJOR(i), "sd");
> >
> > diff -urN linux-2.4.7/drivers/scsi/sd.h linux/drivers/scsi/sd.h
> > --- linux-2.4.7/drivers/scsi/sd.h Fri Jul 20 15:55:46 2001
> > +++ linux/drivers/scsi/sd.h Mon Jul 30 20:09:12 2001
> > @@ -42,10 +42,14 @@
> >   */
> >  extern kdev_t sd_find_target(void *host, int tgt);
> >
> > -#define N_SD_MAJORS 8
> > +#define N_SD_PREASSIGNED_MAJORS 8
> >
> > +#ifdef CONFIG_SD_MANY
> > +#define SD_PARTITION(i) ((sd_devnum_to_index((i)) << 4) | ((i)&0x0f))
> > +#else
> >  #define SD_MAJOR_MASK (N_SD_MAJORS - 1)
> >  #define SD_PARTITION(i) (((MAJOR(i) & SD_MAJOR_MASK) << 8) | (MINOR(i) &
> 255))
> > +#endif
> >
> >  #endif
> >
> > diff -urN linux-2.4.7/drivers/scsi/sg.c linux/drivers/scsi/sg.c
> > --- linux-2.4.7/drivers/scsi/sg.c Wed Jul  4 18:39:28 2001
> > +++ linux/drivers/scsi/sg.c Mon Jul 30 17:57:52 2001
> > @@ -123,7 +123,6 @@
> >  {
> >        tag:"sg",
> >        scsi_type:0xff,
> > -      major:SCSI_GENERIC_MAJOR,
> >        detect:sg_detect,
> >        init:sg_init,
> >        finish:sg_finish,
> > diff -urN linux-2.4.7/drivers/scsi/sr.c linux/drivers/scsi/sr.c
> > --- linux-2.4.7/drivers/scsi/sr.c Thu Jul  5 14:28:17 2001
> > +++ linux/drivers/scsi/sr.c Mon Jul 30 17:59:33 2001
> > @@ -69,12 +69,15 @@
> >
> >  static int sr_init_command(Scsi_Cmnd *);
> >
> > +static unsigned int sr_major = SCSI_CDROM_MAJOR;
> > +
> >  static struct Scsi_Device_Template sr_template =
> >  {
> >   name:"cdrom",
> >   tag:"sr",
> >   scsi_type:TYPE_ROM,
> > - major:SCSI_CDROM_MAJOR,
> > + majors:&sr_major,
> > + num_majors:1,
> >   blk:1,
> >   detect:sr_detect,
> >   init:sr_init,
> > diff -urN linux-2.4.7/drivers/scsi/st.c linux/drivers/scsi/st.c
> > --- linux-2.4.7/drivers/scsi/st.c Fri Jul 20 00:16:32 2001
> > +++ linux/drivers/scsi/st.c Mon Jul 30 17:58:22 2001
> > @@ -160,7 +160,6 @@
> >   name:"tape",
> >   tag:"st",
> >   scsi_type:TYPE_TAPE,
> > - major:SCSI_TAPE_MAJOR,
> >   detect:st_detect,
> >   init:st_init,
> >   attach:st_attach,
> > diff -urN linux-2.4.7/fs/devfs/base.c linux/fs/devfs/base.c
> > --- linux-2.4.7/fs/devfs/base.c Wed Jul 11 17:55:41 2001
> > +++ linux/fs/devfs/base.c Mon Jul 30 19:10:41 2001
> > @@ -511,6 +511,9 @@
> >          Removed broken devnum allocation and use <devfs_alloc_devnum>.
> >          Fixed old devnum leak by calling new <devfs_dealloc_devnum>.
> >    v0.107
> > +    20010712   Richard Gooch <rgooch@atnf.csiro.au>
> > +        Fixed bug in <devfs_setup> which could hang boot process.
> > +  v0.108
> >  */
> >  #include <linux/types.h>
> >  #include <linux/errno.h>
> > @@ -543,7 +546,7 @@
> >  #include <asm/bitops.h>
> >  #include <asm/atomic.h>
> >
> > -#define DEVFS_VERSION            "0.107 (20010709)"
> > +#define DEVFS_VERSION            "0.108 (20010712)"
> >
> >  #define DEVFS_NAME "devfs"
> >
> > @@ -1342,12 +1345,12 @@
> >       return NULL;
> >   }
> >      }
> > -    de->u.fcb.autogen = 0;
> > +    de->u.fcb.autogen = FALSE;
> >      if ( S_ISCHR (mode) || S_ISBLK (mode) )
> >      {
> >   de->u.fcb.u.device.major = major;
> >   de->u.fcb.u.device.minor = minor;
> > - de->u.fcb.autogen = (devnum == NODEV) ? 0 : 1;
> > + de->u.fcb.autogen = (devnum == NODEV) ? FALSE : TRUE;
> >      }
> >      else if ( S_ISREG (mode) ) de->u.fcb.u.file.size = 0;
> >      else
> > @@ -1418,7 +1421,7 @@
> >      MKDEV (de->u.fcb.u.device.major,
> >     de->u.fcb.u.device.minor) );
> >   }
> > - de->u.fcb.autogen = 0;
> > + de->u.fcb.autogen = FALSE;
> >   return;
> >      }
> >      if (S_ISLNK (de->mode) && de->registered)
> > @@ -2063,6 +2066,7 @@
> >   {"show",      OPTION_SHOW,        &boot_options},
> >   {"only",      OPTION_ONLY,        &boot_options},
> >   {"mount",     OPTION_MOUNT,       &boot_options},
> > + {NULL,        0,                  NULL}
> >      };
> >
> >      while ( (*str != '\0') && !isspace (*str) )
> > @@ -2074,7 +2078,7 @@
> >       invert = 1;
> >       str += 2;
> >   }
> > - for (i = 0; i < sizeof (devfs_options_tab); i++)
> > + for (i = 0; devfs_options_tab[i].name != NULL; i++)
> >   {
> >       int len = strlen (devfs_options_tab[i].name);
> >
> > diff -urN linux-2.4.7/fs/devfs/util.c linux/fs/devfs/util.c
> > --- linux-2.4.7/fs/devfs/util.c Wed Jul 11 17:55:41 2001
> > +++ linux/fs/devfs/util.c Mon Jul 30 18:28:12 2001
> > @@ -39,6 +39,8 @@
> >                 Created <devfs_*alloc_major> and <devfs_*alloc_devnum>.
> >      20010710   Richard Gooch <rgooch@atnf.csiro.au>
> >                 Created <devfs_*alloc_unique_number>.
> > +    20010730   Richard Gooch <rgooch@atnf.csiro.au>
> > +               Documentation typo fix.
> >  */
> >  #include <linux/module.h>
> >  #include <linux/init.h>
> > @@ -214,7 +216,7 @@
> >
> >  /**
> >   * devfs_alloc_major - Allocate a major number.
> > - * @type: The type of the major (DEVFS_SPECIAL_CHR or
> DEVFS_SPECIAL_BLOCK)
> > + * @type: The type of the major (DEVFS_SPECIAL_CHR or DEVFS_SPECIAL_BLK)
> >
> >   * Returns the allocated major, else -1 if none are available.
> >   * This routine is thread safe and does not block.
> > @@ -238,7 +240,7 @@
> >
> >  /**
> >   * devfs_dealloc_major - Deallocate a major number.
> > - * @type: The type of the major (DEVFS_SPECIAL_CHR or
> DEVFS_SPECIAL_BLOCK)
> > + * @type: The type of the major (DEVFS_SPECIAL_CHR or DEVFS_SPECIAL_BLK)
> >   * @major: The major number.
> >   * This routine is thread safe and does not block.
> >   */
> > @@ -282,7 +284,7 @@
> >
> >  /**
> >   * devfs_alloc_devnum - Allocate a device number.
> > - * @type: The type (DEVFS_SPECIAL_CHR or DEVFS_SPECIAL_BLOCK).
> > + * @type: The type (DEVFS_SPECIAL_CHR or DEVFS_SPECIAL_BLK).
> >   *
> >   * Returns the allocated device number, else NODEV if none are available.
> >   * This routine is thread safe and may block.
> > @@ -347,7 +349,7 @@
> >
> >  /**
> >   * devfs_dealloc_devnum - Dellocate a device number.
> > - * @type: The type (DEVFS_SPECIAL_CHR or DEVFS_SPECIAL_BLOCK).
> > + * @type: The type (DEVFS_SPECIAL_CHR or DEVFS_SPECIAL_BLK).
> >   * @devnum: The device number.
> >   *
> >   * This routine is thread safe and does not block.
> > diff -urN linux-2.4.7/include/linux/blk.h linux/include/linux/blk.h
> > --- linux-2.4.7/include/linux/blk.h Mon Jul 30 19:20:01 2001
> > +++ linux/include/linux/blk.h Mon Jul 30 20:05:18 2001
> > @@ -144,7 +144,11 @@
> >
> >  #define DEVICE_NAME "scsidisk"
> >  #define TIMEOUT_VALUE (2*HZ)
> > +#ifdef CONFIG_SD_MANY
> > +#define DEVICE_NR(device) sd_devnum_to_index((device))
> > +#else
> >  #define DEVICE_NR(device) (((MAJOR(device) & SD_MAJOR_MASK) << (8 - 4)) +
> (MINOR(device) >> 4))
> > +#endif
> >
> >  /* Kludge to use the same number for both char and block major numbers */
> >  #elif  (MAJOR_NR == MD_MAJOR) && defined(MD_DRIVER)
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> > the body of a message to majordomo@vger.kernel.org
> >
> 
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