sd.c 58.4 KB
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/*
 *      sd.c Copyright (C) 1992 Drew Eckhardt
 *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
 *
 *      Linux scsi disk driver
 *              Initial versions: Drew Eckhardt
 *              Subsequent revisions: Eric Youngdale
 *	Modification history:
 *       - Drew Eckhardt <drew@colorado.edu> original
 *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
 *         outstanding request, and other enhancements.
 *         Support loadable low-level scsi drivers.
 *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
 *         eight major numbers.
 *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
 *	 - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
 *	   sd_init and cleanups.
 *	 - Alex Davis <letmein@erols.com> Fix problem where partition info
 *	   not being read in sd_open. Fix problem where removable media 
 *	   could be ejected after sd_open.
 *	 - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
 *	 - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
 *	   <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
 *	   Support 32k/1M disks.
 *
 *	Logging policy (needs CONFIG_SCSI_LOGGING defined):
 *	 - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
 *	 - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
 *	 - entering sd_ioctl: SCSI_LOG_IOCTL level 1
 *	 - entering other commands: SCSI_LOG_HLQUEUE level 3
 *	Note: when the logging level is set by the user, it must be greater
 *	than the level indicated above to trigger output.	
 */

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bio.h>
#include <linux/genhd.h>
#include <linux/hdreg.h>
#include <linux/errno.h>
#include <linux/idr.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/string_helpers.h>
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#include <linux/async.h>
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#include <asm/uaccess.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/scsicam.h>

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#include "sd.h"
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#include "scsi_logging.h"

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MODULE_AUTHOR("Eric Youngdale");
MODULE_DESCRIPTION("SCSI disk (sd) driver");
MODULE_LICENSE("GPL");

MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
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#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
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#define SD_MINORS	16
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#else
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#define SD_MINORS	0
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#endif

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static int  sd_revalidate_disk(struct gendisk *);
static int  sd_probe(struct device *);
static int  sd_remove(struct device *);
static void sd_shutdown(struct device *);
static int sd_suspend(struct device *, pm_message_t state);
static int sd_resume(struct device *);
static void sd_rescan(struct device *);
static int sd_done(struct scsi_cmnd *);
static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
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static void scsi_disk_release(struct device *cdev);
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static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
static void sd_print_result(struct scsi_disk *, int);

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static DEFINE_SPINLOCK(sd_index_lock);
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static DEFINE_IDA(sd_index_ida);
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/* This semaphore is used to mediate the 0->1 reference get in the
 * face of object destruction (i.e. we can't allow a get on an
 * object after last put) */
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static DEFINE_MUTEX(sd_ref_mutex);
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static const char *sd_cache_types[] = {
	"write through", "none", "write back",
	"write back, no read (daft)"
};

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static ssize_t
sd_store_cache_type(struct device *dev, struct device_attribute *attr,
		    const char *buf, size_t count)
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{
	int i, ct = -1, rcd, wce, sp;
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	struct scsi_disk *sdkp = to_scsi_disk(dev);
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	struct scsi_device *sdp = sdkp->device;
	char buffer[64];
	char *buffer_data;
	struct scsi_mode_data data;
	struct scsi_sense_hdr sshdr;
	int len;

	if (sdp->type != TYPE_DISK)
		/* no cache control on RBC devices; theoretically they
		 * can do it, but there's probably so many exceptions
		 * it's not worth the risk */
		return -EINVAL;

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	for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
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		const int len = strlen(sd_cache_types[i]);
		if (strncmp(sd_cache_types[i], buf, len) == 0 &&
		    buf[len] == '\n') {
			ct = i;
			break;
		}
	}
	if (ct < 0)
		return -EINVAL;
	rcd = ct & 0x01 ? 1 : 0;
	wce = ct & 0x02 ? 1 : 0;
	if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
			    SD_MAX_RETRIES, &data, NULL))
		return -EINVAL;
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	len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
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		  data.block_descriptor_length);
	buffer_data = buffer + data.header_length +
		data.block_descriptor_length;
	buffer_data[2] &= ~0x05;
	buffer_data[2] |= wce << 2 | rcd;
	sp = buffer_data[0] & 0x80 ? 1 : 0;

	if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
			     SD_MAX_RETRIES, &data, &sshdr)) {
		if (scsi_sense_valid(&sshdr))
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			sd_print_sense_hdr(sdkp, &sshdr);
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		return -EINVAL;
	}
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	revalidate_disk(sdkp->disk);
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	return count;
}

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static ssize_t
sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t count)
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{
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	struct scsi_disk *sdkp = to_scsi_disk(dev);
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	struct scsi_device *sdp = sdkp->device;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);

	return count;
}

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static ssize_t
sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
		       const char *buf, size_t count)
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{
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	struct scsi_disk *sdkp = to_scsi_disk(dev);
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	struct scsi_device *sdp = sdkp->device;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (sdp->type != TYPE_DISK)
		return -EINVAL;

	sdp->allow_restart = simple_strtoul(buf, NULL, 10);

	return count;
}

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static ssize_t
sd_show_cache_type(struct device *dev, struct device_attribute *attr,
		   char *buf)
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{
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	struct scsi_disk *sdkp = to_scsi_disk(dev);
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	int ct = sdkp->RCD + 2*sdkp->WCE;

	return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
}

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static ssize_t
sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
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{
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	struct scsi_disk *sdkp = to_scsi_disk(dev);
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	return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
}

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static ssize_t
sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
			  char *buf)
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{
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	struct scsi_disk *sdkp = to_scsi_disk(dev);
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	struct scsi_device *sdp = sdkp->device;

	return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
}

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static ssize_t
sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
		      char *buf)
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{
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	struct scsi_disk *sdkp = to_scsi_disk(dev);
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	return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
}

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static ssize_t
sd_show_protection_type(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct scsi_disk *sdkp = to_scsi_disk(dev);

	return snprintf(buf, 20, "%u\n", sdkp->protection_type);
}

static ssize_t
sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
		    char *buf)
{
	struct scsi_disk *sdkp = to_scsi_disk(dev);

	return snprintf(buf, 20, "%u\n", sdkp->ATO);
}

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static struct device_attribute sd_disk_attrs[] = {
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	__ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
	       sd_store_cache_type),
	__ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
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	__ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
	       sd_store_allow_restart),
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	__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
	       sd_store_manage_start_stop),
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	__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
	__ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
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	__ATTR_NULL,
};

static struct class sd_disk_class = {
	.name		= "scsi_disk",
	.owner		= THIS_MODULE,
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	.dev_release	= scsi_disk_release,
	.dev_attrs	= sd_disk_attrs,
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};
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static struct scsi_driver sd_template = {
	.owner			= THIS_MODULE,
	.gendrv = {
		.name		= "sd",
		.probe		= sd_probe,
		.remove		= sd_remove,
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		.suspend	= sd_suspend,
		.resume		= sd_resume,
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		.shutdown	= sd_shutdown,
	},
	.rescan			= sd_rescan,
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	.done			= sd_done,
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};

/*
 * Device no to disk mapping:
 * 
 *       major         disc2     disc  p1
 *   |............|.............|....|....| <- dev_t
 *    31        20 19          8 7  4 3  0
 * 
 * Inside a major, we have 16k disks, however mapped non-
 * contiguously. The first 16 disks are for major0, the next
 * ones with major1, ... Disk 256 is for major0 again, disk 272 
 * for major1, ... 
 * As we stay compatible with our numbering scheme, we can reuse 
 * the well-know SCSI majors 8, 65--71, 136--143.
 */
static int sd_major(int major_idx)
{
	switch (major_idx) {
	case 0:
		return SCSI_DISK0_MAJOR;
	case 1 ... 7:
		return SCSI_DISK1_MAJOR + major_idx - 1;
	case 8 ... 15:
		return SCSI_DISK8_MAJOR + major_idx - 8;
	default:
		BUG();
		return 0;	/* shut up gcc */
	}
}

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static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
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{
	struct scsi_disk *sdkp = NULL;

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	if (disk->private_data) {
		sdkp = scsi_disk(disk);
		if (scsi_device_get(sdkp->device) == 0)
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			get_device(&sdkp->dev);
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		else
			sdkp = NULL;
	}
	return sdkp;
}

static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
{
	struct scsi_disk *sdkp;

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	mutex_lock(&sd_ref_mutex);
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	sdkp = __scsi_disk_get(disk);
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	mutex_unlock(&sd_ref_mutex);
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	return sdkp;
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}
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static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
{
	struct scsi_disk *sdkp;

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	mutex_lock(&sd_ref_mutex);
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	sdkp = dev_get_drvdata(dev);
	if (sdkp)
		sdkp = __scsi_disk_get(sdkp->disk);
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	mutex_unlock(&sd_ref_mutex);
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	return sdkp;
}

static void scsi_disk_put(struct scsi_disk *sdkp)
{
	struct scsi_device *sdev = sdkp->device;

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	mutex_lock(&sd_ref_mutex);
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	put_device(&sdkp->dev);
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	scsi_device_put(sdev);
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	mutex_unlock(&sd_ref_mutex);
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}

/**
 *	sd_init_command - build a scsi (read or write) command from
 *	information in the request structure.
 *	@SCpnt: pointer to mid-level's per scsi command structure that
 *	contains request and into which the scsi command is written
 *
 *	Returns 1 if successful and 0 if error (or cannot be done now).
 **/
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static int sd_prep_fn(struct request_queue *q, struct request *rq)
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{
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	struct scsi_cmnd *SCpnt;
	struct scsi_device *sdp = q->queuedata;
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	struct gendisk *disk = rq->rq_disk;
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	struct scsi_disk *sdkp;
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	sector_t block = rq->sector;
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	sector_t threshold;
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	unsigned int this_count = rq->nr_sectors;
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	int ret, host_dif;
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	if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
		ret = scsi_setup_blk_pc_cmnd(sdp, rq);
		goto out;
	} else if (rq->cmd_type != REQ_TYPE_FS) {
		ret = BLKPREP_KILL;
		goto out;
	}
	ret = scsi_setup_fs_cmnd(sdp, rq);
	if (ret != BLKPREP_OK)
		goto out;
	SCpnt = rq->special;
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	sdkp = scsi_disk(disk);
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	/* from here on until we're complete, any goto out
	 * is used for a killable error condition */
	ret = BLKPREP_KILL;
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	SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
					"sd_init_command: block=%llu, "
					"count=%d\n",
					(unsigned long long)block,
					this_count));
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	if (!sdp || !scsi_device_online(sdp) ||
 	    block + rq->nr_sectors > get_capacity(disk)) {
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		SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
						"Finishing %ld sectors\n",
						rq->nr_sectors));
		SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
						"Retry with 0x%p\n", SCpnt));
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		goto out;
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	}

	if (sdp->changed) {
		/*
		 * quietly refuse to do anything to a changed disc until 
		 * the changed bit has been reset
		 */
		/* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
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		goto out;
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	}
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	/*
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	 * Some SD card readers can't handle multi-sector accesses which touch
	 * the last one or two hardware sectors.  Split accesses as needed.
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	 */
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	threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
		(sdp->sector_size / 512);

	if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
		if (block < threshold) {
			/* Access up to the threshold but not beyond */
			this_count = threshold - block;
		} else {
			/* Access only a single hardware sector */
			this_count = sdp->sector_size / 512;
		}
	}
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	SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
					(unsigned long long)block));
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	/*
	 * If we have a 1K hardware sectorsize, prevent access to single
	 * 512 byte sectors.  In theory we could handle this - in fact
	 * the scsi cdrom driver must be able to handle this because
	 * we typically use 1K blocksizes, and cdroms typically have
	 * 2K hardware sectorsizes.  Of course, things are simpler
	 * with the cdrom, since it is read-only.  For performance
	 * reasons, the filesystems should be able to handle this
	 * and not force the scsi disk driver to use bounce buffers
	 * for this.
	 */
	if (sdp->sector_size == 1024) {
		if ((block & 1) || (rq->nr_sectors & 1)) {
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			scmd_printk(KERN_ERR, SCpnt,
				    "Bad block number requested\n");
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			goto out;
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		} else {
			block = block >> 1;
			this_count = this_count >> 1;
		}
	}
	if (sdp->sector_size == 2048) {
		if ((block & 3) || (rq->nr_sectors & 3)) {
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			scmd_printk(KERN_ERR, SCpnt,
				    "Bad block number requested\n");
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			goto out;
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		} else {
			block = block >> 2;
			this_count = this_count >> 2;
		}
	}
	if (sdp->sector_size == 4096) {
		if ((block & 7) || (rq->nr_sectors & 7)) {
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			scmd_printk(KERN_ERR, SCpnt,
				    "Bad block number requested\n");
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			goto out;
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		} else {
			block = block >> 3;
			this_count = this_count >> 3;
		}
	}
	if (rq_data_dir(rq) == WRITE) {
		if (!sdp->writeable) {
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			goto out;
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		}
		SCpnt->cmnd[0] = WRITE_6;
		SCpnt->sc_data_direction = DMA_TO_DEVICE;
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		if (blk_integrity_rq(rq) &&
		    sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
			goto out;

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	} else if (rq_data_dir(rq) == READ) {
		SCpnt->cmnd[0] = READ_6;
		SCpnt->sc_data_direction = DMA_FROM_DEVICE;
	} else {
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		scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
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		goto out;
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	}

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	SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
					"%s %d/%ld 512 byte blocks.\n",
					(rq_data_dir(rq) == WRITE) ?
					"writing" : "reading", this_count,
					rq->nr_sectors));
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	/* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
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	host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
	if (host_dif)
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		SCpnt->cmnd[1] = 1 << 5;
	else
		SCpnt->cmnd[1] = 0;

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	if (block > 0xffffffff) {
		SCpnt->cmnd[0] += READ_16 - READ_6;
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		SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
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		SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
		SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
		SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
		SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
		SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
		SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
		SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
		SCpnt->cmnd[9] = (unsigned char) block & 0xff;
		SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
		SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
		SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
		SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
		SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
	} else if ((this_count > 0xff) || (block > 0x1fffff) ||
543
		   scsi_device_protection(SCpnt->device) ||
L
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		   SCpnt->device->use_10_for_rw) {
		if (this_count > 0xffff)
			this_count = 0xffff;

		SCpnt->cmnd[0] += READ_10 - READ_6;
T
Tejun Heo 已提交
549
		SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
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550 551 552 553 554 555 556 557
		SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
		SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
		SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
		SCpnt->cmnd[5] = (unsigned char) block & 0xff;
		SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
		SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
		SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
	} else {
T
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		if (unlikely(blk_fua_rq(rq))) {
			/*
			 * This happens only if this drive failed
			 * 10byte rw command with ILLEGAL_REQUEST
			 * during operation and thus turned off
			 * use_10_for_rw.
			 */
565 566
			scmd_printk(KERN_ERR, SCpnt,
				    "FUA write on READ/WRITE(6) drive\n");
567
			goto out;
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568 569
		}

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		SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
		SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
		SCpnt->cmnd[3] = (unsigned char) block & 0xff;
		SCpnt->cmnd[4] = (unsigned char) this_count;
		SCpnt->cmnd[5] = 0;
	}
B
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576
	SCpnt->sdb.length = this_count * sdp->sector_size;
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578
	/* If DIF or DIX is enabled, tell HBA how to handle request */
579
	if (host_dif || scsi_prot_sg_count(SCpnt))
580 581
		sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt),
			  sdkp->protection_type);
582

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	/*
	 * We shouldn't disconnect in the middle of a sector, so with a dumb
	 * host adapter, it's safe to assume that we can at least transfer
	 * this many bytes between each connect / disconnect.
	 */
	SCpnt->transfersize = sdp->sector_size;
	SCpnt->underflow = this_count << 9;
	SCpnt->allowed = SD_MAX_RETRIES;

	/*
	 * This indicates that the command is ready from our end to be
	 * queued.
	 */
596 597 598
	ret = BLKPREP_OK;
 out:
	return scsi_prep_return(q, rq, ret);
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}

/**
 *	sd_open - open a scsi disk device
 *	@inode: only i_rdev member may be used
 *	@filp: only f_mode and f_flags may be used
 *
 *	Returns 0 if successful. Returns a negated errno value in case 
 *	of error.
 *
 *	Note: This can be called from a user context (e.g. fsck(1) )
 *	or from within the kernel (e.g. as a result of a mount(1) ).
 *	In the latter case @inode and @filp carry an abridged amount
 *	of information as noted above.
 **/
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static int sd_open(struct block_device *bdev, fmode_t mode)
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{
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	struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
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	struct scsi_device *sdev;
	int retval;

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	if (!sdkp)
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		return -ENXIO;

623
	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
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	sdev = sdkp->device;

	/*
	 * If the device is in error recovery, wait until it is done.
	 * If the device is offline, then disallow any access to it.
	 */
	retval = -ENXIO;
	if (!scsi_block_when_processing_errors(sdev))
		goto error_out;

	if (sdev->removable || sdkp->write_prot)
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636
		check_disk_change(bdev);
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	/*
	 * If the drive is empty, just let the open fail.
	 */
	retval = -ENOMEDIUM;
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	if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
L
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		goto error_out;

	/*
	 * If the device has the write protect tab set, have the open fail
	 * if the user expects to be able to write to the thing.
	 */
	retval = -EROFS;
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	if (sdkp->write_prot && (mode & FMODE_WRITE))
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		goto error_out;

	/*
	 * It is possible that the disk changing stuff resulted in
	 * the device being taken offline.  If this is the case,
	 * report this to the user, and don't pretend that the
	 * open actually succeeded.
	 */
	retval = -ENXIO;
	if (!scsi_device_online(sdev))
		goto error_out;

	if (!sdkp->openers++ && sdev->removable) {
		if (scsi_block_when_processing_errors(sdev))
			scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
	}

	return 0;

error_out:
	scsi_disk_put(sdkp);
	return retval;	
}

/**
 *	sd_release - invoked when the (last) close(2) is called on this
 *	scsi disk.
 *	@inode: only i_rdev member may be used
 *	@filp: only f_mode and f_flags may be used
 *
 *	Returns 0. 
 *
 *	Note: may block (uninterruptible) if error recovery is underway
 *	on this disk.
 **/
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static int sd_release(struct gendisk *disk, fmode_t mode)
L
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687 688 689 690
{
	struct scsi_disk *sdkp = scsi_disk(disk);
	struct scsi_device *sdev = sdkp->device;

691
	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
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692 693 694 695 696 697 698 699 700 701 702 703 704 705

	if (!--sdkp->openers && sdev->removable) {
		if (scsi_block_when_processing_errors(sdev))
			scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
	}

	/*
	 * XXX and what if there are packets in flight and this close()
	 * XXX is followed by a "rmmod sd_mod"?
	 */
	scsi_disk_put(sdkp);
	return 0;
}

706
static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
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707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723
{
	struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
	struct scsi_device *sdp = sdkp->device;
	struct Scsi_Host *host = sdp->host;
	int diskinfo[4];

	/* default to most commonly used values */
        diskinfo[0] = 0x40;	/* 1 << 6 */
       	diskinfo[1] = 0x20;	/* 1 << 5 */
       	diskinfo[2] = sdkp->capacity >> 11;
	
	/* override with calculated, extended default, or driver values */
	if (host->hostt->bios_param)
		host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
	else
		scsicam_bios_param(bdev, sdkp->capacity, diskinfo);

724 725 726
	geo->heads = diskinfo[0];
	geo->sectors = diskinfo[1];
	geo->cylinders = diskinfo[2];
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727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
	return 0;
}

/**
 *	sd_ioctl - process an ioctl
 *	@inode: only i_rdev/i_bdev members may be used
 *	@filp: only f_mode and f_flags may be used
 *	@cmd: ioctl command number
 *	@arg: this is third argument given to ioctl(2) system call.
 *	Often contains a pointer.
 *
 *	Returns 0 if successful (some ioctls return postive numbers on
 *	success as well). Returns a negated errno value in case of error.
 *
 *	Note: most ioctls are forward onto the block subsystem or further
742
 *	down in the scsi subsystem.
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 **/
A
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static int sd_ioctl(struct block_device *bdev, fmode_t mode,
L
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745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
		    unsigned int cmd, unsigned long arg)
{
	struct gendisk *disk = bdev->bd_disk;
	struct scsi_device *sdp = scsi_disk(disk)->device;
	void __user *p = (void __user *)arg;
	int error;
    
	SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
						disk->disk_name, cmd));

	/*
	 * If we are in the middle of error recovery, don't let anyone
	 * else try and use this device.  Also, if error recovery fails, it
	 * may try and take the device offline, in which case all further
	 * access to the device is prohibited.
	 */
761
	error = scsi_nonblockable_ioctl(sdp, cmd, p,
762
					(mode & FMODE_NDELAY) != 0);
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	if (!scsi_block_when_processing_errors(sdp) || !error)
		return error;

	/*
	 * Send SCSI addressing ioctls directly to mid level, send other
	 * ioctls to block level and then onto mid level if they can't be
	 * resolved.
	 */
	switch (cmd) {
		case SCSI_IOCTL_GET_IDLUN:
		case SCSI_IOCTL_GET_BUS_NUMBER:
			return scsi_ioctl(sdp, cmd, p);
		default:
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			error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
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			if (error != -ENOTTY)
				return error;
	}
	return scsi_ioctl(sdp, cmd, p);
}

static void set_media_not_present(struct scsi_disk *sdkp)
{
	sdkp->media_present = 0;
	sdkp->capacity = 0;
	sdkp->device->changed = 1;
}

/**
 *	sd_media_changed - check if our medium changed
 *	@disk: kernel device descriptor 
 *
 *	Returns 0 if not applicable or no change; 1 if change
 *
 *	Note: this function is invoked from the block subsystem.
 **/
static int sd_media_changed(struct gendisk *disk)
{
	struct scsi_disk *sdkp = scsi_disk(disk);
	struct scsi_device *sdp = sdkp->device;
802
	struct scsi_sense_hdr *sshdr = NULL;
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	int retval;

805
	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
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	if (!sdp->removable)
		return 0;

	/*
	 * If the device is offline, don't send any commands - just pretend as
	 * if the command failed.  If the device ever comes back online, we
	 * can deal with it then.  It is only because of unrecoverable errors
	 * that we would ever take a device offline in the first place.
	 */
816 817 818 819 820
	if (!scsi_device_online(sdp)) {
		set_media_not_present(sdkp);
		retval = 1;
		goto out;
	}
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	/*
	 * Using TEST_UNIT_READY enables differentiation between drive with
	 * no cartridge loaded - NOT READY, drive with changed cartridge -
	 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
	 *
	 * Drives that auto spin down. eg iomega jaz 1G, will be started
	 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
	 * sd_revalidate() is called.
	 */
	retval = -ENODEV;
832

833 834 835 836 837
	if (scsi_block_when_processing_errors(sdp)) {
		sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
		retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
					      sshdr);
	}
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838 839 840 841 842 843 844

	/*
	 * Unable to test, unit probably not ready.   This usually
	 * means there is no disc in the drive.  Mark as changed,
	 * and we will figure it out later once the drive is
	 * available again.
	 */
845 846 847
	if (retval || (scsi_sense_valid(sshdr) &&
		       /* 0x3a is medium not present */
		       sshdr->asc == 0x3a)) {
848 849 850 851
		set_media_not_present(sdkp);
		retval = 1;
		goto out;
	}
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	/*
	 * For removable scsi disk we have to recognise the presence
	 * of a disk in the drive. This is kept in the struct scsi_disk
	 * struct and tested at open !  Daniel Roche (dan@lectra.fr)
	 */
	sdkp->media_present = 1;

	retval = sdp->changed;
	sdp->changed = 0;
862 863 864 865
out:
	if (retval != sdkp->previous_state)
		sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
	sdkp->previous_state = retval;
866
	kfree(sshdr);
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867 868 869
	return retval;
}

870
static int sd_sync_cache(struct scsi_disk *sdkp)
L
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871 872
{
	int retries, res;
873
	struct scsi_device *sdp = sdkp->device;
874
	struct scsi_sense_hdr sshdr;
L
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875 876 877 878 879 880 881 882 883 884 885 886 887

	if (!scsi_device_online(sdp))
		return -ENODEV;


	for (retries = 3; retries > 0; --retries) {
		unsigned char cmd[10] = { 0 };

		cmd[0] = SYNCHRONIZE_CACHE;
		/*
		 * Leave the rest of the command zero to indicate
		 * flush everything.
		 */
888
		res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
889
				       SD_TIMEOUT, SD_MAX_RETRIES, NULL);
890
		if (res == 0)
L
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891 892 893
			break;
	}

894 895 896 897
	if (res) {
		sd_print_result(sdkp, res);
		if (driver_byte(res) & DRIVER_SENSE)
			sd_print_sense_hdr(sdkp, &sshdr);
L
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898 899
	}

900 901 902
	if (res)
		return -EIO;
	return 0;
L
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903 904
}

905
static void sd_prepare_flush(struct request_queue *q, struct request *rq)
L
Linus Torvalds 已提交
906
{
907
	rq->cmd_type = REQ_TYPE_BLOCK_PC;
J
James Bottomley 已提交
908 909
	rq->timeout = SD_TIMEOUT;
	rq->cmd[0] = SYNCHRONIZE_CACHE;
910
	rq->cmd_len = 10;
L
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911 912 913 914
}

static void sd_rescan(struct device *dev)
{
A
Alan Stern 已提交
915 916 917
	struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);

	if (sdkp) {
918
		revalidate_disk(sdkp->disk);
A
Alan Stern 已提交
919 920
		scsi_disk_put(sdkp);
	}
L
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921 922 923 924 925 926 927 928
}


#ifdef CONFIG_COMPAT
/* 
 * This gets directly called from VFS. When the ioctl 
 * is not recognized we go back to the other translation paths. 
 */
A
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929 930
static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
			   unsigned int cmd, unsigned long arg)
L
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931
{
A
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932
	struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
L
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933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959

	/*
	 * If we are in the middle of error recovery, don't let anyone
	 * else try and use this device.  Also, if error recovery fails, it
	 * may try and take the device offline, in which case all further
	 * access to the device is prohibited.
	 */
	if (!scsi_block_when_processing_errors(sdev))
		return -ENODEV;
	       
	if (sdev->host->hostt->compat_ioctl) {
		int ret;

		ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);

		return ret;
	}

	/* 
	 * Let the static ioctl translation table take care of it.
	 */
	return -ENOIOCTLCMD; 
}
#endif

static struct block_device_operations sd_fops = {
	.owner			= THIS_MODULE,
A
Al Viro 已提交
960 961 962
	.open			= sd_open,
	.release		= sd_release,
	.locked_ioctl		= sd_ioctl,
963
	.getgeo			= sd_getgeo,
L
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964
#ifdef CONFIG_COMPAT
A
Al Viro 已提交
965
	.compat_ioctl		= sd_compat_ioctl,
L
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966 967 968 969 970
#endif
	.media_changed		= sd_media_changed,
	.revalidate_disk	= sd_revalidate_disk,
};

971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
{
	u64 start_lba = scmd->request->sector;
	u64 end_lba = scmd->request->sector + (scsi_bufflen(scmd) / 512);
	u64 bad_lba;
	int info_valid;

	if (!blk_fs_request(scmd->request))
		return 0;

	info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
					     SCSI_SENSE_BUFFERSIZE,
					     &bad_lba);
	if (!info_valid)
		return 0;

	if (scsi_bufflen(scmd) <= scmd->device->sector_size)
		return 0;

	if (scmd->device->sector_size < 512) {
		/* only legitimate sector_size here is 256 */
		start_lba <<= 1;
		end_lba <<= 1;
	} else {
		/* be careful ... don't want any overflows */
		u64 factor = scmd->device->sector_size / 512;
		do_div(start_lba, factor);
		do_div(end_lba, factor);
	}

	/* The bad lba was reported incorrectly, we have no idea where
	 * the error is.
	 */
	if (bad_lba < start_lba  || bad_lba >= end_lba)
		return 0;

	/* This computation should always be done in terms of
	 * the resolution of the device's medium.
	 */
	return (bad_lba - start_lba) * scmd->device->sector_size;
}

L
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1013
/**
1014
 *	sd_done - bottom half handler: called when the lower level
L
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1015 1016 1017 1018 1019
 *	driver has completed (successfully or otherwise) a scsi command.
 *	@SCpnt: mid-level's per command structure.
 *
 *	Note: potentially run from within an ISR. Must not block.
 **/
1020
static int sd_done(struct scsi_cmnd *SCpnt)
L
Linus Torvalds 已提交
1021 1022
{
	int result = SCpnt->result;
1023
	unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
L
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1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
	struct scsi_sense_hdr sshdr;
	int sense_valid = 0;
	int sense_deferred = 0;

	if (result) {
		sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
		if (sense_valid)
			sense_deferred = scsi_sense_is_deferred(&sshdr);
	}
#ifdef CONFIG_SCSI_LOGGING
1034
	SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
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1035
	if (sense_valid) {
1036
		SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1037
						   "sd_done: sb[respc,sk,asc,"
1038 1039 1040 1041
						   "ascq]=%x,%x,%x,%x\n",
						   sshdr.response_code,
						   sshdr.sense_key, sshdr.asc,
						   sshdr.ascq));
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1042 1043
	}
#endif
1044 1045 1046 1047 1048 1049 1050
	if (driver_byte(result) != DRIVER_SENSE &&
	    (!sense_valid || sense_deferred))
		goto out;

	switch (sshdr.sense_key) {
	case HARDWARE_ERROR:
	case MEDIUM_ERROR:
1051
		good_bytes = sd_completed_bytes(SCpnt);
1052 1053 1054 1055 1056 1057 1058 1059
		break;
	case RECOVERED_ERROR:
		/* Inform the user, but make sure that it's not treated
		 * as a hard error.
		 */
		scsi_print_sense("sd", SCpnt);
		SCpnt->result = 0;
		memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1060 1061
		good_bytes = scsi_bufflen(SCpnt);
		break;
1062 1063 1064 1065 1066 1067 1068 1069 1070
	case NO_SENSE:
		/* This indicates a false check condition, so ignore it.  An
		 * unknown amount of data was transferred so treat it as an
		 * error.
		 */
		scsi_print_sense("sd", SCpnt);
		SCpnt->result = 0;
		memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
		break;
1071 1072 1073 1074 1075 1076
	case ABORTED_COMMAND:
		if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
			scsi_print_result(SCpnt);
			scsi_print_sense("sd", SCpnt);
			good_bytes = sd_completed_bytes(SCpnt);
		}
1077 1078
		break;
	case ILLEGAL_REQUEST:
1079 1080 1081 1082 1083
		if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
			scsi_print_result(SCpnt);
			scsi_print_sense("sd", SCpnt);
			good_bytes = sd_completed_bytes(SCpnt);
		}
1084 1085 1086
		break;
	default:
		break;
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	}
1088
 out:
1089 1090 1091
	if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
		sd_dif_complete(SCpnt, good_bytes);

1092
	return good_bytes;
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}

1095 1096
static int media_not_present(struct scsi_disk *sdkp,
			     struct scsi_sense_hdr *sshdr)
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{

1099
	if (!scsi_sense_valid(sshdr))
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		return 0;
	/* not invoked for commands that could return deferred errors */
1102 1103 1104 1105 1106 1107
	if (sshdr->sense_key != NOT_READY &&
	    sshdr->sense_key != UNIT_ATTENTION)
		return 0;
	if (sshdr->asc != 0x3A) /* medium not present */
		return 0;

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	set_media_not_present(sdkp);
	return 1;
}

/*
 * spinup disk - called only in sd_revalidate_disk()
 */
static void
1116
sd_spinup_disk(struct scsi_disk *sdkp)
1117
{
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	unsigned char cmd[10];
1119
	unsigned long spintime_expire = 0;
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	int retries, spintime;
	unsigned int the_result;
	struct scsi_sense_hdr sshdr;
	int sense_valid = 0;

	spintime = 0;

	/* Spin up drives, as required.  Only do this at boot time */
	/* Spinup needs to be done for module loads too. */
	do {
		retries = 0;

		do {
			cmd[0] = TEST_UNIT_READY;
			memset((void *) &cmd[1], 0, 9);

1136 1137 1138
			the_result = scsi_execute_req(sdkp->device, cmd,
						      DMA_NONE, NULL, 0,
						      &sshdr, SD_TIMEOUT,
1139
						      SD_MAX_RETRIES, NULL);
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			/*
			 * If the drive has indicated to us that it
			 * doesn't have any media in it, don't bother
			 * with any more polling.
			 */
			if (media_not_present(sdkp, &sshdr))
				return;

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			if (the_result)
1150
				sense_valid = scsi_sense_valid(&sshdr);
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			retries++;
		} while (retries < 3 && 
			 (!scsi_status_is_good(the_result) ||
			  ((driver_byte(the_result) & DRIVER_SENSE) &&
			  sense_valid && sshdr.sense_key == UNIT_ATTENTION)));

		if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
			/* no sense, TUR either succeeded or failed
			 * with a status error */
1160 1161 1162 1163
			if(!spintime && !scsi_status_is_good(the_result)) {
				sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
				sd_print_result(sdkp, the_result);
			}
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			break;
		}
					
		/*
		 * The device does not want the automatic start to be issued.
		 */
1170
		if (sdkp->device->no_start_on_add)
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			break;

1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
		if (sense_valid && sshdr.sense_key == NOT_READY) {
			if (sshdr.asc == 4 && sshdr.ascq == 3)
				break;	/* manual intervention required */
			if (sshdr.asc == 4 && sshdr.ascq == 0xb)
				break;	/* standby */
			if (sshdr.asc == 4 && sshdr.ascq == 0xc)
				break;	/* unavailable */
			/*
			 * Issue command to spin up drive when not ready
			 */
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			if (!spintime) {
1184
				sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
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				cmd[0] = START_STOP;
				cmd[1] = 1;	/* Return immediately */
				memset((void *) &cmd[2], 0, 8);
				cmd[4] = 1;	/* Start spin cycle */
1189 1190
				if (sdkp->device->start_stop_pwr_cond)
					cmd[4] |= 1 << 4;
1191 1192
				scsi_execute_req(sdkp->device, cmd, DMA_NONE,
						 NULL, 0, &sshdr,
1193 1194
						 SD_TIMEOUT, SD_MAX_RETRIES,
						 NULL);
1195 1196
				spintime_expire = jiffies + 100 * HZ;
				spintime = 1;
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			}
			/* Wait 1 second for next try */
			msleep(1000);
			printk(".");
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215

		/*
		 * Wait for USB flash devices with slow firmware.
		 * Yes, this sense key/ASC combination shouldn't
		 * occur here.  It's characteristic of these devices.
		 */
		} else if (sense_valid &&
				sshdr.sense_key == UNIT_ATTENTION &&
				sshdr.asc == 0x28) {
			if (!spintime) {
				spintime_expire = jiffies + 5 * HZ;
				spintime = 1;
			}
			/* Wait 1 second for next try */
			msleep(1000);
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		} else {
			/* we don't understand the sense code, so it's
			 * probably pointless to loop */
			if(!spintime) {
1220 1221
				sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
				sd_print_sense_hdr(sdkp, &sshdr);
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			}
			break;
		}
				
1226
	} while (spintime && time_before_eq(jiffies, spintime_expire));
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	if (spintime) {
		if (scsi_status_is_good(the_result))
			printk("ready\n");
		else
			printk("not responding...\n");
	}
}

1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249

/*
 * Determine whether disk supports Data Integrity Field.
 */
void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
{
	struct scsi_device *sdp = sdkp->device;
	u8 type;

	if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
		type = 0;
	else
		type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */

1250 1251
	sdkp->protection_type = type;

1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
	switch (type) {
	case SD_DIF_TYPE0_PROTECTION:
	case SD_DIF_TYPE1_PROTECTION:
	case SD_DIF_TYPE3_PROTECTION:
		break;

	case SD_DIF_TYPE2_PROTECTION:
		sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 "	\
			  "protection which is currently unsupported. "	\
			  "Disabling disk!\n");
		goto disable;

	default:
		sd_printk(KERN_ERR, sdkp, "formatted with unknown "	\
			  "protection type %d. Disabling disk!\n", type);
		goto disable;
	}

	return;

disable:
	sdkp->capacity = 0;
}

1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
			struct scsi_sense_hdr *sshdr, int sense_valid,
			int the_result)
{
	sd_print_result(sdkp, the_result);
	if (driver_byte(the_result) & DRIVER_SENSE)
		sd_print_sense_hdr(sdkp, sshdr);
	else
		sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");

	/*
	 * Set dirty bit for removable devices if not ready -
	 * sometimes drives will not report this properly.
	 */
	if (sdp->removable &&
	    sense_valid && sshdr->sense_key == NOT_READY)
		sdp->changed = 1;

	/*
	 * We used to set media_present to 0 here to indicate no media
	 * in the drive, but some drives fail read capacity even with
	 * media present, so we can't do that.
	 */
	sdkp->capacity = 0; /* unknown mapped to zero - as usual */
}

#define RC16_LEN 32
#if RC16_LEN > SD_BUF_SIZE
#error RC16_LEN must not be more than SD_BUF_SIZE
#endif

static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
						unsigned char *buffer)
1309
{
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	unsigned char cmd[16];
	struct scsi_sense_hdr sshdr;
	int sense_valid = 0;
1313 1314 1315 1316
	int the_result;
	int retries = 3;
	unsigned long long lba;
	unsigned sector_size;
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	do {
1319 1320 1321 1322 1323 1324
		memset(cmd, 0, 16);
		cmd[0] = SERVICE_ACTION_IN;
		cmd[1] = SAI_READ_CAPACITY_16;
		cmd[13] = RC16_LEN;
		memset(buffer, 0, RC16_LEN);

1325
		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1326 1327
					buffer, RC16_LEN, &sshdr,
					SD_TIMEOUT, SD_MAX_RETRIES, NULL);
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1329
		if (media_not_present(sdkp, &sshdr))
1330
			return -ENODEV;
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		if (the_result)
1333
			sense_valid = scsi_sense_valid(&sshdr);
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		retries--;

	} while (the_result && retries);

1338
	if (the_result) {
1339
		sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1340 1341 1342
		read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
		return -EINVAL;
	}
1343

1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429
	sector_size =	(buffer[8] << 24) | (buffer[9] << 16) |
			(buffer[10] << 8) | buffer[11];
	lba =  (((u64)buffer[0] << 56) | ((u64)buffer[1] << 48) |
		((u64)buffer[2] << 40) | ((u64)buffer[3] << 32) |
		((u64)buffer[4] << 24) | ((u64)buffer[5] << 16) |
		((u64)buffer[6] << 8) | (u64)buffer[7]);

	sd_read_protection_type(sdkp, buffer);

	if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
		sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
			"kernel compiled with support for large block "
			"devices.\n");
		sdkp->capacity = 0;
		return -EOVERFLOW;
	}

	sdkp->capacity = lba + 1;
	return sector_size;
}

static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
						unsigned char *buffer)
{
	unsigned char cmd[16];
	struct scsi_sense_hdr sshdr;
	int sense_valid = 0;
	int the_result;
	int retries = 3;
	sector_t lba;
	unsigned sector_size;

	do {
		cmd[0] = READ_CAPACITY;
		memset(&cmd[1], 0, 9);
		memset(buffer, 0, 8);

		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
					buffer, 8, &sshdr,
					SD_TIMEOUT, SD_MAX_RETRIES, NULL);

		if (media_not_present(sdkp, &sshdr))
			return -ENODEV;

		if (the_result)
			sense_valid = scsi_sense_valid(&sshdr);
		retries--;

	} while (the_result && retries);

	if (the_result) {
		sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
		read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
		return -EINVAL;
	}

	sector_size =	(buffer[4] << 24) | (buffer[5] << 16) |
			(buffer[6] << 8) | buffer[7];
	lba =	(buffer[0] << 24) | (buffer[1] << 16) |
		(buffer[2] << 8) | buffer[3];

	if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
		sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
			"kernel compiled with support for large block "
			"devices.\n");
		sdkp->capacity = 0;
		return -EOVERFLOW;
	}

	sdkp->capacity = lba + 1;
	return sector_size;
}

/*
 * read disk capacity
 */
static void
sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
{
	int sector_size;
	struct scsi_device *sdp = sdkp->device;

	/* Force READ CAPACITY(16) when PROTECT=1 */
	if (scsi_device_protection(sdp)) {
		sector_size = read_capacity_16(sdkp, sdp, buffer);
		if (sector_size == -EOVERFLOW)
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			goto got_data;
1431 1432
		if (sector_size < 0)
			return;
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	} else {
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453
		sector_size = read_capacity_10(sdkp, sdp, buffer);
		if (sector_size == -EOVERFLOW)
			goto got_data;
		if (sector_size < 0)
			return;
		if ((sizeof(sdkp->capacity) > 4) &&
		    (sdkp->capacity > 0xffffffffULL)) {
			int old_sector_size = sector_size;
			sd_printk(KERN_NOTICE, sdkp, "Very big device. "
					"Trying to use READ CAPACITY(16).\n");
			sector_size = read_capacity_16(sdkp, sdp, buffer);
			if (sector_size < 0) {
				sd_printk(KERN_NOTICE, sdkp,
					"Using 0xffffffff as device size\n");
				sdkp->capacity = 1 + (sector_t) 0xffffffff;
				sector_size = old_sector_size;
				goto got_data;
			}
		}
	}
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1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
	/* Some devices are known to return the total number of blocks,
	 * not the highest block number.  Some devices have versions
	 * which do this and others which do not.  Some devices we might
	 * suspect of doing this but we don't know for certain.
	 *
	 * If we know the reported capacity is wrong, decrement it.  If
	 * we can only guess, then assume the number of blocks is even
	 * (usually true but not always) and err on the side of lowering
	 * the capacity.
	 */
	if (sdp->fix_capacity ||
	    (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
		sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
				"from its reported value: %llu\n",
				(unsigned long long) sdkp->capacity);
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		--sdkp->capacity;
1471 1472
	}

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got_data:
	if (sector_size == 0) {
		sector_size = 512;
1476 1477
		sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
			  "assuming 512.\n");
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	}

	if (sector_size != 512 &&
	    sector_size != 1024 &&
	    sector_size != 2048 &&
	    sector_size != 4096 &&
	    sector_size != 256) {
1485 1486
		sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
			  sector_size);
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		/*
		 * The user might want to re-format the drive with
		 * a supported sectorsize.  Once this happens, it
		 * would be relatively trivial to set the thing up.
		 * For this reason, we leave the thing in the table.
		 */
		sdkp->capacity = 0;
		/*
		 * set a bogus sector size so the normal read/write
		 * logic in the block layer will eventually refuse any
		 * request on this device without tripping over power
		 * of two sector size assumptions
		 */
		sector_size = 512;
	}
1502 1503
	blk_queue_hardsect_size(sdp->request_queue, sector_size);

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	{
1505
		char cap_str_2[10], cap_str_10[10];
1506
		u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
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1508 1509 1510 1511
		string_get_size(sz, STRING_UNITS_2, cap_str_2,
				sizeof(cap_str_2));
		string_get_size(sz, STRING_UNITS_10, cap_str_10,
				sizeof(cap_str_10));
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1513
		sd_printk(KERN_NOTICE, sdkp,
1514
			  "%llu %d-byte hardware sectors: (%s/%s)\n",
1515
			  (unsigned long long)sdkp->capacity,
1516
			  sector_size, cap_str_10, cap_str_2);
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	}

	/* Rescale capacity to 512-byte units */
	if (sector_size == 4096)
		sdkp->capacity <<= 3;
	else if (sector_size == 2048)
		sdkp->capacity <<= 2;
	else if (sector_size == 1024)
		sdkp->capacity <<= 1;
	else if (sector_size == 256)
		sdkp->capacity >>= 1;

	sdkp->device->sector_size = sector_size;
}

/* called with buffer of length 512 */
static inline int
1534 1535 1536
sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
		 unsigned char *buffer, int len, struct scsi_mode_data *data,
		 struct scsi_sense_hdr *sshdr)
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{
1538
	return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1539
			       SD_TIMEOUT, SD_MAX_RETRIES, data,
1540
			       sshdr);
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}

/*
 * read write protect setting, if possible - called only in sd_revalidate_disk()
1545
 * called with buffer of length SD_BUF_SIZE
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 */
static void
1548
sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1549
{
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	int res;
1551
	struct scsi_device *sdp = sdkp->device;
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	struct scsi_mode_data data;

	set_disk_ro(sdkp->disk, 0);
1555
	if (sdp->skip_ms_page_3f) {
1556
		sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
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		return;
	}

1560 1561
	if (sdp->use_192_bytes_for_3f) {
		res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
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	} else {
		/*
		 * First attempt: ask for all pages (0x3F), but only 4 bytes.
		 * We have to start carefully: some devices hang if we ask
		 * for more than is available.
		 */
1568
		res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
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		/*
		 * Second attempt: ask for page 0 When only page 0 is
		 * implemented, a request for page 3F may return Sense Key
		 * 5: Illegal Request, Sense Code 24: Invalid field in
		 * CDB.
		 */
		if (!scsi_status_is_good(res))
1577
			res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
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		/*
		 * Third attempt: ask 255 bytes, as we did earlier.
		 */
		if (!scsi_status_is_good(res))
1583 1584
			res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
					       &data, NULL);
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	}

	if (!scsi_status_is_good(res)) {
1588 1589
		sd_printk(KERN_WARNING, sdkp,
			  "Test WP failed, assume Write Enabled\n");
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	} else {
		sdkp->write_prot = ((data.device_specific & 0x80) != 0);
		set_disk_ro(sdkp->disk, sdkp->write_prot);
1593 1594 1595 1596 1597
		sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
			  sdkp->write_prot ? "on" : "off");
		sd_printk(KERN_DEBUG, sdkp,
			  "Mode Sense: %02x %02x %02x %02x\n",
			  buffer[0], buffer[1], buffer[2], buffer[3]);
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	}
}

/*
 * sd_read_cache_type - called only from sd_revalidate_disk()
1603
 * called with buffer of length SD_BUF_SIZE
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 */
static void
1606
sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1607
{
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	int len = 0, res;
1609
	struct scsi_device *sdp = sdkp->device;
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	int dbd;
	int modepage;
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	struct scsi_mode_data data;
	struct scsi_sense_hdr sshdr;

1616
	if (sdp->skip_ms_page_8)
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		goto defaults;

1619
	if (sdp->type == TYPE_RBC) {
1620 1621 1622 1623 1624 1625 1626
		modepage = 6;
		dbd = 8;
	} else {
		modepage = 8;
		dbd = 0;
	}

L
Linus Torvalds 已提交
1627
	/* cautiously ask */
1628
	res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
L
Linus Torvalds 已提交
1629 1630 1631 1632

	if (!scsi_status_is_good(res))
		goto bad_sense;

1633 1634
	if (!data.header_length) {
		modepage = 6;
1635
		sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1636 1637
	}

L
Linus Torvalds 已提交
1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
	/* that went OK, now ask for the proper length */
	len = data.length;

	/*
	 * We're only interested in the first three bytes, actually.
	 * But the data cache page is defined for the first 20.
	 */
	if (len < 3)
		goto bad_sense;
	if (len > 20)
		len = 20;

	/* Take headers and block descriptors into account */
	len += data.header_length + data.block_descriptor_length;
1652 1653
	if (len > SD_BUF_SIZE)
		goto bad_sense;
L
Linus Torvalds 已提交
1654 1655

	/* Get the data */
1656
	res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
L
Linus Torvalds 已提交
1657 1658

	if (scsi_status_is_good(res)) {
1659
		int offset = data.header_length + data.block_descriptor_length;
L
Linus Torvalds 已提交
1660

1661
		if (offset >= SD_BUF_SIZE - 2) {
1662
			sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1663 1664 1665
			goto defaults;
		}

1666
		if ((buffer[offset] & 0x3f) != modepage) {
1667
			sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1668 1669 1670 1671 1672 1673 1674 1675 1676 1677
			goto defaults;
		}

		if (modepage == 8) {
			sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
			sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
		} else {
			sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
			sdkp->RCD = 0;
		}
L
Linus Torvalds 已提交
1678

T
Tejun Heo 已提交
1679 1680
		sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
		if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1681 1682
			sd_printk(KERN_NOTICE, sdkp,
				  "Uses READ/WRITE(6), disabling FUA\n");
T
Tejun Heo 已提交
1683 1684 1685
			sdkp->DPOFUA = 0;
		}

1686 1687
		sd_printk(KERN_NOTICE, sdkp,
		       "Write cache: %s, read cache: %s, %s\n",
1688 1689 1690 1691
		       sdkp->WCE ? "enabled" : "disabled",
		       sdkp->RCD ? "disabled" : "enabled",
		       sdkp->DPOFUA ? "supports DPO and FUA"
		       : "doesn't support DPO or FUA");
L
Linus Torvalds 已提交
1692 1693 1694 1695 1696

		return;
	}

bad_sense:
1697
	if (scsi_sense_valid(&sshdr) &&
L
Linus Torvalds 已提交
1698 1699
	    sshdr.sense_key == ILLEGAL_REQUEST &&
	    sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1700 1701
		/* Invalid field in CDB */
		sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
L
Linus Torvalds 已提交
1702
	else
1703
		sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
L
Linus Torvalds 已提交
1704 1705

defaults:
1706
	sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
L
Linus Torvalds 已提交
1707 1708
	sdkp->WCE = 0;
	sdkp->RCD = 0;
1709
	sdkp->DPOFUA = 0;
L
Linus Torvalds 已提交
1710 1711
}

1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757
/*
 * The ATO bit indicates whether the DIF application tag is available
 * for use by the operating system.
 */
void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
{
	int res, offset;
	struct scsi_device *sdp = sdkp->device;
	struct scsi_mode_data data;
	struct scsi_sense_hdr sshdr;

	if (sdp->type != TYPE_DISK)
		return;

	if (sdkp->protection_type == 0)
		return;

	res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
			      SD_MAX_RETRIES, &data, &sshdr);

	if (!scsi_status_is_good(res) || !data.header_length ||
	    data.length < 6) {
		sd_printk(KERN_WARNING, sdkp,
			  "getting Control mode page failed, assume no ATO\n");

		if (scsi_sense_valid(&sshdr))
			sd_print_sense_hdr(sdkp, &sshdr);

		return;
	}

	offset = data.header_length + data.block_descriptor_length;

	if ((buffer[offset] & 0x3f) != 0x0a) {
		sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
		return;
	}

	if ((buffer[offset + 5] & 0x80) == 0)
		return;

	sdkp->ATO = 1;

	return;
}

L
Linus Torvalds 已提交
1758 1759 1760 1761 1762 1763 1764 1765 1766 1767
/**
 *	sd_revalidate_disk - called the first time a new disk is seen,
 *	performs disk spin up, read_capacity, etc.
 *	@disk: struct gendisk we care about
 **/
static int sd_revalidate_disk(struct gendisk *disk)
{
	struct scsi_disk *sdkp = scsi_disk(disk);
	struct scsi_device *sdp = sdkp->device;
	unsigned char *buffer;
1768
	unsigned ordered;
L
Linus Torvalds 已提交
1769

1770 1771
	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
				      "sd_revalidate_disk\n"));
L
Linus Torvalds 已提交
1772 1773 1774 1775 1776 1777 1778 1779

	/*
	 * If the device is offline, don't try and read capacity or any
	 * of the other niceties.
	 */
	if (!scsi_device_online(sdp))
		goto out;

B
Bernhard Walle 已提交
1780
	buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
L
Linus Torvalds 已提交
1781
	if (!buffer) {
1782 1783
		sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
			  "allocation failure.\n");
1784
		goto out;
L
Linus Torvalds 已提交
1785 1786 1787 1788 1789 1790 1791 1792 1793
	}

	/* defaults, until the device tells us otherwise */
	sdp->sector_size = 512;
	sdkp->capacity = 0;
	sdkp->media_present = 1;
	sdkp->write_prot = 0;
	sdkp->WCE = 0;
	sdkp->RCD = 0;
1794
	sdkp->ATO = 0;
L
Linus Torvalds 已提交
1795

1796
	sd_spinup_disk(sdkp);
L
Linus Torvalds 已提交
1797 1798 1799 1800 1801 1802

	/*
	 * Without media there is no reason to ask; moreover, some devices
	 * react badly if we do.
	 */
	if (sdkp->media_present) {
1803 1804 1805
		sd_read_capacity(sdkp, buffer);
		sd_read_write_protect_flag(sdkp, buffer);
		sd_read_cache_type(sdkp, buffer);
1806
		sd_read_app_tag_own(sdkp, buffer);
L
Linus Torvalds 已提交
1807
	}
1808 1809 1810 1811 1812 1813 1814 1815

	/*
	 * We now have all cache related info, determine how we deal
	 * with ordered requests.  Note that as the current SCSI
	 * dispatch function can alter request order, we cannot use
	 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
	 */
	if (sdkp->WCE)
T
Tejun Heo 已提交
1816 1817
		ordered = sdkp->DPOFUA
			? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1818 1819 1820 1821 1822
	else
		ordered = QUEUE_ORDERED_DRAIN;

	blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);

L
Linus Torvalds 已提交
1823 1824 1825 1826 1827 1828 1829
	set_capacity(disk, sdkp->capacity);
	kfree(buffer);

 out:
	return 0;
}

1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875
/**
 *	sd_format_disk_name - format disk name
 *	@prefix: name prefix - ie. "sd" for SCSI disks
 *	@index: index of the disk to format name for
 *	@buf: output buffer
 *	@buflen: length of the output buffer
 *
 *	SCSI disk names starts at sda.  The 26th device is sdz and the
 *	27th is sdaa.  The last one for two lettered suffix is sdzz
 *	which is followed by sdaaa.
 *
 *	This is basically 26 base counting with one extra 'nil' entry
 *	at the beggining from the second digit on and can be
 *	determined using similar method as 26 base conversion with the
 *	index shifted -1 after each digit is computed.
 *
 *	CONTEXT:
 *	Don't care.
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
{
	const int base = 'z' - 'a' + 1;
	char *begin = buf + strlen(prefix);
	char *end = buf + buflen;
	char *p;
	int unit;

	p = end - 1;
	*p = '\0';
	unit = base;
	do {
		if (p == begin)
			return -EINVAL;
		*--p = 'a' + (index % unit);
		index = (index / unit) - 1;
	} while (index >= 0);

	memmove(begin, p, end - p);
	memcpy(buf, prefix, strlen(prefix));

	return 0;
}

1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902
/*
 * The asynchronous part of sd_probe
 */
static void sd_probe_async(void *data, async_cookie_t cookie)
{
	struct scsi_disk *sdkp = data;
	struct scsi_device *sdp;
	struct gendisk *gd;
	u32 index;
	struct device *dev;

	sdp = sdkp->device;
	gd = sdkp->disk;
	index = sdkp->index;
	dev = &sdp->sdev_gendev;

	if (!sdp->request_queue->rq_timeout) {
		if (sdp->type != TYPE_MOD)
			blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
		else
			blk_queue_rq_timeout(sdp->request_queue,
					     SD_MOD_TIMEOUT);
	}

	device_initialize(&sdkp->dev);
	sdkp->dev.parent = &sdp->sdev_gendev;
	sdkp->dev.class = &sd_disk_class;
1903
	dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940

	if (device_add(&sdkp->dev))
		goto out_free_index;

	get_device(&sdp->sdev_gendev);

	if (index < SD_MAX_DISKS) {
		gd->major = sd_major((index & 0xf0) >> 4);
		gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
		gd->minors = SD_MINORS;
	}
	gd->fops = &sd_fops;
	gd->private_data = &sdkp->driver;
	gd->queue = sdkp->device->request_queue;

	sd_revalidate_disk(gd);

	blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);

	gd->driverfs_dev = &sdp->sdev_gendev;
	gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
	if (sdp->removable)
		gd->flags |= GENHD_FL_REMOVABLE;

	dev_set_drvdata(dev, sdkp);
	add_disk(gd);
	sd_dif_config_host(sdkp);

	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
		  sdp->removable ? "removable " : "");

	return;

 out_free_index:
	ida_remove(&sd_index_ida, index);
}

L
Linus Torvalds 已提交
1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967
/**
 *	sd_probe - called during driver initialization and whenever a
 *	new scsi device is attached to the system. It is called once
 *	for each scsi device (not just disks) present.
 *	@dev: pointer to device object
 *
 *	Returns 0 if successful (or not interested in this scsi device 
 *	(e.g. scanner)); 1 when there is an error.
 *
 *	Note: this function is invoked from the scsi mid-level.
 *	This function sets up the mapping between a given 
 *	<host,channel,id,lun> (found in sdp) and new device name 
 *	(e.g. /dev/sda). More precisely it is the block device major 
 *	and minor number that is chosen here.
 *
 *	Assume sd_attach is not re-entrant (for time being)
 *	Also think about sd_attach() and sd_remove() running coincidentally.
 **/
static int sd_probe(struct device *dev)
{
	struct scsi_device *sdp = to_scsi_device(dev);
	struct scsi_disk *sdkp;
	struct gendisk *gd;
	u32 index;
	int error;

	error = -ENODEV;
1968
	if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
L
Linus Torvalds 已提交
1969 1970
		goto out;

1971 1972
	SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
					"sd_attach\n"));
L
Linus Torvalds 已提交
1973 1974

	error = -ENOMEM;
J
Jes Sorensen 已提交
1975
	sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
L
Linus Torvalds 已提交
1976 1977 1978
	if (!sdkp)
		goto out;

1979
	gd = alloc_disk(SD_MINORS);
L
Linus Torvalds 已提交
1980 1981 1982
	if (!gd)
		goto out_free;

1983 1984 1985
	do {
		if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
			goto out_put;
L
Linus Torvalds 已提交
1986

T
Tejun Heo 已提交
1987
		spin_lock(&sd_index_lock);
1988
		error = ida_get_new(&sd_index_ida, &index);
T
Tejun Heo 已提交
1989
		spin_unlock(&sd_index_lock);
1990
	} while (error == -EAGAIN);
L
Linus Torvalds 已提交
1991 1992 1993 1994

	if (error)
		goto out_put;

1995 1996
	error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
	if (error)
1997 1998
		goto out_free_index;

L
Linus Torvalds 已提交
1999 2000 2001 2002 2003
	sdkp->device = sdp;
	sdkp->driver = &sd_template;
	sdkp->disk = gd;
	sdkp->index = index;
	sdkp->openers = 0;
2004
	sdkp->previous_state = 1;
L
Linus Torvalds 已提交
2005

2006
	async_schedule(sd_probe_async, sdkp);
L
Linus Torvalds 已提交
2007 2008 2009

	return 0;

2010
 out_free_index:
T
Tejun Heo 已提交
2011
	spin_lock(&sd_index_lock);
2012
	ida_remove(&sd_index_ida, index);
T
Tejun Heo 已提交
2013
	spin_unlock(&sd_index_lock);
2014
 out_put:
L
Linus Torvalds 已提交
2015
	put_disk(gd);
2016
 out_free:
L
Linus Torvalds 已提交
2017
	kfree(sdkp);
2018
 out:
L
Linus Torvalds 已提交
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036
	return error;
}

/**
 *	sd_remove - called whenever a scsi disk (previously recognized by
 *	sd_probe) is detached from the system. It is called (potentially
 *	multiple times) during sd module unload.
 *	@sdp: pointer to mid level scsi device object
 *
 *	Note: this function is invoked from the scsi mid-level.
 *	This function potentially frees up a device name (e.g. /dev/sdc)
 *	that could be re-used by a subsequent sd_probe().
 *	This function is not called when the built-in sd driver is "exit-ed".
 **/
static int sd_remove(struct device *dev)
{
	struct scsi_disk *sdkp = dev_get_drvdata(dev);

2037
	device_del(&sdkp->dev);
L
Linus Torvalds 已提交
2038 2039
	del_gendisk(sdkp->disk);
	sd_shutdown(dev);
A
Alan Stern 已提交
2040

2041
	mutex_lock(&sd_ref_mutex);
A
Alan Stern 已提交
2042
	dev_set_drvdata(dev, NULL);
2043
	put_device(&sdkp->dev);
2044
	mutex_unlock(&sd_ref_mutex);
L
Linus Torvalds 已提交
2045 2046 2047 2048 2049 2050

	return 0;
}

/**
 *	scsi_disk_release - Called to free the scsi_disk structure
2051
 *	@dev: pointer to embedded class device
L
Linus Torvalds 已提交
2052
 *
2053
 *	sd_ref_mutex must be held entering this routine.  Because it is
L
Linus Torvalds 已提交
2054 2055
 *	called on last put, you should always use the scsi_disk_get()
 *	scsi_disk_put() helpers which manipulate the semaphore directly
2056
 *	and never do a direct put_device.
L
Linus Torvalds 已提交
2057
 **/
2058
static void scsi_disk_release(struct device *dev)
L
Linus Torvalds 已提交
2059
{
2060
	struct scsi_disk *sdkp = to_scsi_disk(dev);
L
Linus Torvalds 已提交
2061 2062
	struct gendisk *disk = sdkp->disk;
	
T
Tejun Heo 已提交
2063
	spin_lock(&sd_index_lock);
2064
	ida_remove(&sd_index_ida, sdkp->index);
T
Tejun Heo 已提交
2065
	spin_unlock(&sd_index_lock);
L
Linus Torvalds 已提交
2066 2067 2068

	disk->private_data = NULL;
	put_disk(disk);
A
Alan Stern 已提交
2069
	put_device(&sdkp->device->sdev_gendev);
L
Linus Torvalds 已提交
2070 2071 2072 2073

	kfree(sdkp);
}

2074
static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2075 2076 2077
{
	unsigned char cmd[6] = { START_STOP };	/* START_VALID */
	struct scsi_sense_hdr sshdr;
2078
	struct scsi_device *sdp = sdkp->device;
2079 2080 2081 2082 2083
	int res;

	if (start)
		cmd[4] |= 1;	/* START */

2084 2085 2086
	if (sdp->start_stop_pwr_cond)
		cmd[4] |= start ? 1 << 4 : 3 << 4;	/* Active or Standby */

2087 2088 2089 2090
	if (!scsi_device_online(sdp))
		return -ENODEV;

	res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2091
			       SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2092
	if (res) {
2093 2094
		sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
		sd_print_result(sdkp, res);
2095
		if (driver_byte(res) & DRIVER_SENSE)
2096
			sd_print_sense_hdr(sdkp, &sshdr);
2097 2098 2099 2100 2101
	}

	return res;
}

L
Linus Torvalds 已提交
2102 2103 2104 2105 2106 2107 2108
/*
 * Send a SYNCHRONIZE CACHE instruction down to the device through
 * the normal SCSI command structure.  Wait for the command to
 * complete.
 */
static void sd_shutdown(struct device *dev)
{
A
Alan Stern 已提交
2109
	struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
L
Linus Torvalds 已提交
2110 2111 2112 2113

	if (!sdkp)
		return;         /* this can happen */

A
Alan Stern 已提交
2114
	if (sdkp->WCE) {
2115 2116
		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
		sd_sync_cache(sdkp);
A
Alan Stern 已提交
2117
	}
2118

2119 2120 2121
	if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
		sd_start_stop_device(sdkp, 0);
2122 2123
	}

A
Alan Stern 已提交
2124 2125
	scsi_disk_put(sdkp);
}
L
Linus Torvalds 已提交
2126

2127 2128 2129
static int sd_suspend(struct device *dev, pm_message_t mesg)
{
	struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2130
	int ret = 0;
2131 2132 2133 2134 2135

	if (!sdkp)
		return 0;	/* this can happen */

	if (sdkp->WCE) {
2136
		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2137 2138
		ret = sd_sync_cache(sdkp);
		if (ret)
2139
			goto done;
2140 2141
	}

2142
	if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2143 2144
		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
		ret = sd_start_stop_device(sdkp, 0);
2145 2146
	}

2147 2148 2149
done:
	scsi_disk_put(sdkp);
	return ret;
2150 2151 2152 2153 2154
}

static int sd_resume(struct device *dev)
{
	struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2155
	int ret = 0;
2156

2157
	if (!sdkp->device->manage_start_stop)
2158
		goto done;
2159

2160
	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2161
	ret = sd_start_stop_device(sdkp, 1);
2162

2163 2164 2165
done:
	scsi_disk_put(sdkp);
	return ret;
2166 2167
}

L
Linus Torvalds 已提交
2168 2169 2170 2171 2172 2173 2174 2175
/**
 *	init_sd - entry point for this driver (both when built in or when
 *	a module).
 *
 *	Note: this function registers this driver with the scsi mid-level.
 **/
static int __init init_sd(void)
{
2176
	int majors = 0, i, err;
L
Linus Torvalds 已提交
2177 2178 2179 2180 2181 2182 2183 2184 2185 2186

	SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));

	for (i = 0; i < SD_MAJORS; i++)
		if (register_blkdev(sd_major(i), "sd") == 0)
			majors++;

	if (!majors)
		return -ENODEV;

2187 2188 2189
	err = class_register(&sd_disk_class);
	if (err)
		goto err_out;
2190

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	err = scsi_register_driver(&sd_template.gendrv);
	if (err)
		goto err_out_class;

	return 0;

err_out_class:
	class_unregister(&sd_disk_class);
err_out:
	for (i = 0; i < SD_MAJORS; i++)
		unregister_blkdev(sd_major(i), "sd");
	return err;
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}

/**
 *	exit_sd - exit point for this driver (when it is a module).
 *
 *	Note: this function unregisters this driver from the scsi mid-level.
 **/
static void __exit exit_sd(void)
{
	int i;

	SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));

	scsi_unregister_driver(&sd_template.gendrv);
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	class_unregister(&sd_disk_class);

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	for (i = 0; i < SD_MAJORS; i++)
		unregister_blkdev(sd_major(i), "sd");
}

module_init(init_sd);
module_exit(exit_sd);
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static void sd_print_sense_hdr(struct scsi_disk *sdkp,
			       struct scsi_sense_hdr *sshdr)
{
	sd_printk(KERN_INFO, sdkp, "");
	scsi_show_sense_hdr(sshdr);
	sd_printk(KERN_INFO, sdkp, "");
	scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
}

static void sd_print_result(struct scsi_disk *sdkp, int result)
{
	sd_printk(KERN_INFO, sdkp, "");
	scsi_show_result(result);
}