sd.c 56.3 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 <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_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) ||
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		   scsi_device_protection(SCpnt->device) ||
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		   SCpnt->device->use_10_for_rw) {
		if (this_count > 0xffff)
			this_count = 0xffff;

		SCpnt->cmnd[0] += READ_10 - READ_6;
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		SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
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		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 {
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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.
			 */
563 564
			scmd_printk(KERN_ERR, SCpnt,
				    "FUA write on READ/WRITE(6) drive\n");
565
			goto out;
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		}

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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;
	}
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	SCpnt->sdb.length = this_count * sdp->sector_size;
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576
	/* If DIF or DIX is enabled, tell HBA how to handle request */
577
	if (host_dif || scsi_prot_sg_count(SCpnt))
578 579
		sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt),
			  sdkp->protection_type);
580

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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.
	 */
594 595 596
	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.
 **/
static int sd_open(struct inode *inode, struct file *filp)
{
	struct gendisk *disk = inode->i_bdev->bd_disk;
	struct scsi_disk *sdkp;
	struct scsi_device *sdev;
	int retval;

	if (!(sdkp = scsi_disk_get(disk)))
		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)
		check_disk_change(inode->i_bdev);

	/*
	 * If the drive is empty, just let the open fail.
	 */
	retval = -ENOMEDIUM;
	if (sdev->removable && !sdkp->media_present &&
	    !(filp->f_flags & O_NDELAY))
		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;
	if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
		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.
 **/
static int sd_release(struct inode *inode, struct file *filp)
{
	struct gendisk *disk = inode->i_bdev->bd_disk;
	struct scsi_disk *sdkp = scsi_disk(disk);
	struct scsi_device *sdev = sdkp->device;

693
	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
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	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;
}

708
static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
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{
	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);

726 727 728
	geo->heads = diskinfo[0];
	geo->sectors = diskinfo[1];
	geo->cylinders = diskinfo[2];
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	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
744
 *	down in the scsi subsystem.
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 **/
static int sd_ioctl(struct inode * inode, struct file * filp, 
		    unsigned int cmd, unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	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.
	 */
	error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
	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:
778
			error = scsi_cmd_ioctl(filp, disk->queue, disk, 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;
804
	struct scsi_sense_hdr *sshdr = NULL;
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	int retval;

807
	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.
	 */
818 819 820 821 822
	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;
834

835 836 837 838 839
	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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	/*
	 * 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.
	 */
847 848 849
	if (retval || (scsi_sense_valid(sshdr) &&
		       /* 0x3a is medium not present */
		       sshdr->asc == 0x3a)) {
850 851 852 853
		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;
864 865 866 867
out:
	if (retval != sdkp->previous_state)
		sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
	sdkp->previous_state = retval;
868
	kfree(sshdr);
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	return retval;
}

872
static int sd_sync_cache(struct scsi_disk *sdkp)
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{
	int retries, res;
875
	struct scsi_device *sdp = sdkp->device;
876
	struct scsi_sense_hdr sshdr;
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	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.
		 */
890 891 892
		res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
				       SD_TIMEOUT, SD_MAX_RETRIES);
		if (res == 0)
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			break;
	}

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

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

907
static void sd_prepare_flush(struct request_queue *q, struct request *rq)
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{
909
	rq->cmd_type = REQ_TYPE_BLOCK_PC;
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James Bottomley 已提交
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	rq->timeout = SD_TIMEOUT;
	rq->cmd[0] = SYNCHRONIZE_CACHE;
912
	rq->cmd_len = 10;
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913 914 915 916
}

static void sd_rescan(struct device *dev)
{
A
Alan Stern 已提交
917 918 919
	struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);

	if (sdkp) {
920
		revalidate_disk(sdkp->disk);
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921 922
		scsi_disk_put(sdkp);
	}
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}


#ifdef CONFIG_COMPAT
/* 
 * This gets directly called from VFS. When the ioctl 
 * is not recognized we go back to the other translation paths. 
 */
static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
J
Josef Sipek 已提交
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	struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
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	struct gendisk *disk = bdev->bd_disk;
	struct scsi_device *sdev = scsi_disk(disk)->device;

	/*
	 * 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,
	.open			= sd_open,
	.release		= sd_release,
	.ioctl			= sd_ioctl,
966
	.getgeo			= sd_getgeo,
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#ifdef CONFIG_COMPAT
	.compat_ioctl		= sd_compat_ioctl,
#endif
	.media_changed		= sd_media_changed,
	.revalidate_disk	= sd_revalidate_disk,
};

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 1013 1014 1015
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;
}

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/**
1017
 *	sd_done - bottom half handler: called when the lower level
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 *	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.
 **/
1023
static int sd_done(struct scsi_cmnd *SCpnt)
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{
	int result = SCpnt->result;
1026
	unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
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	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
1037
	SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
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1038
	if (sense_valid) {
1039
		SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1040
						   "sd_done: sb[respc,sk,asc,"
1041 1042 1043 1044
						   "ascq]=%x,%x,%x,%x\n",
						   sshdr.response_code,
						   sshdr.sense_key, sshdr.asc,
						   sshdr.ascq));
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	}
#endif
1047 1048 1049 1050 1051 1052 1053
	if (driver_byte(result) != DRIVER_SENSE &&
	    (!sense_valid || sense_deferred))
		goto out;

	switch (sshdr.sense_key) {
	case HARDWARE_ERROR:
	case MEDIUM_ERROR:
1054
		good_bytes = sd_completed_bytes(SCpnt);
1055 1056 1057 1058 1059 1060 1061 1062 1063
		break;
	case RECOVERED_ERROR:
	case NO_SENSE:
		/* 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);
1064 1065 1066 1067 1068 1069 1070 1071
		good_bytes = scsi_bufflen(SCpnt);
		break;
	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);
		}
1072 1073
		break;
	case ILLEGAL_REQUEST:
1074 1075 1076 1077 1078 1079 1080
		if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
			scsi_print_result(SCpnt);
			scsi_print_sense("sd", SCpnt);
			good_bytes = sd_completed_bytes(SCpnt);
		}
		if (!scsi_device_protection(SCpnt->device) &&
		    SCpnt->device->use_10_for_rw &&
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
		    (SCpnt->cmnd[0] == READ_10 ||
		     SCpnt->cmnd[0] == WRITE_10))
			SCpnt->device->use_10_for_rw = 0;
		if (SCpnt->device->use_10_for_ms &&
		    (SCpnt->cmnd[0] == MODE_SENSE_10 ||
		     SCpnt->cmnd[0] == MODE_SELECT_10))
			SCpnt->device->use_10_for_ms = 0;
		break;
	default:
		break;
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	}
1092
 out:
1093 1094 1095
	if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
		sd_dif_complete(SCpnt, good_bytes);

1096
	return good_bytes;
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}

1099 1100
static int media_not_present(struct scsi_disk *sdkp,
			     struct scsi_sense_hdr *sshdr)
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{

1103
	if (!scsi_sense_valid(sshdr))
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		return 0;
	/* not invoked for commands that could return deferred errors */
1106 1107 1108 1109 1110 1111
	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
1120
sd_spinup_disk(struct scsi_disk *sdkp)
1121
{
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	unsigned char cmd[10];
1123
	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);

1140 1141 1142 1143
			the_result = scsi_execute_req(sdkp->device, cmd,
						      DMA_NONE, NULL, 0,
						      &sshdr, SD_TIMEOUT,
						      SD_MAX_RETRIES);
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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)
1154
				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 */
1164 1165 1166 1167
			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.
		 */
		if (sdkp->device->no_start_on_add) {
			break;
		}

		/*
		 * If manual intervention is required, or this is an
		 * absent USB storage device, a spinup is meaningless.
		 */
		if (sense_valid &&
		    sshdr.sense_key == NOT_READY &&
		    sshdr.asc == 4 && sshdr.ascq == 3) {
			break;		/* manual intervention required */

		/*
		 * Issue command to spin up drive when not ready
		 */
		} else if (sense_valid && sshdr.sense_key == NOT_READY) {
			if (!spintime) {
1192
				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 */
1197 1198
				if (sdkp->device->start_stop_pwr_cond)
					cmd[4] |= 1 << 4;
1199 1200 1201
				scsi_execute_req(sdkp->device, cmd, DMA_NONE,
						 NULL, 0, &sshdr,
						 SD_TIMEOUT, SD_MAX_RETRIES);
1202 1203
				spintime_expire = jiffies + 100 * HZ;
				spintime = 1;
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			}
			/* Wait 1 second for next try */
			msleep(1000);
			printk(".");
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222

		/*
		 * 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) {
1227 1228
				sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
				sd_print_sense_hdr(sdkp, &sshdr);
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			}
			break;
		}
				
1233
	} 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");
	}
}

1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256

/*
 * 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 */

1257 1258
	sdkp->protection_type = type;

1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
	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;
}

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/*
 * read disk capacity
 */
static void
1287
sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1288
{
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	unsigned char cmd[16];
	int the_result, retries;
	int sector_size = 0;
1292 1293
	/* Force READ CAPACITY(16) when PROTECT=1 */
	int longrc = scsi_device_protection(sdkp->device) ? 1 : 0;
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	struct scsi_sense_hdr sshdr;
	int sense_valid = 0;
1296
	struct scsi_device *sdp = sdkp->device;
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repeat:
	retries = 3;
	do {
		if (longrc) {
			memset((void *) cmd, 0, 16);
			cmd[0] = SERVICE_ACTION_IN;
			cmd[1] = SAI_READ_CAPACITY_16;
1305 1306
			cmd[13] = 13;
			memset((void *) buffer, 0, 13);
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		} else {
			cmd[0] = READ_CAPACITY;
			memset((void *) &cmd[1], 0, 9);
			memset((void *) buffer, 0, 8);
		}
		
1313
		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1314
					      buffer, longrc ? 13 : 8, &sshdr,
1315
					      SD_TIMEOUT, SD_MAX_RETRIES);
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1317
		if (media_not_present(sdkp, &sshdr))
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			return;

		if (the_result)
1321
			sense_valid = scsi_sense_valid(&sshdr);
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		retries--;

	} while (the_result && retries);

	if (the_result && !longrc) {
1327 1328
		sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
		sd_print_result(sdkp, the_result);
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		if (driver_byte(the_result) & DRIVER_SENSE)
1330
			sd_print_sense_hdr(sdkp, &sshdr);
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		else
1332
			sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
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		/* 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;

		/* Either no media are present but the drive didn't tell us,
		   or they are present but the read capacity command fails */
		/* sdkp->media_present = 0; -- not always correct */
1343
		sdkp->capacity = 0; /* unknown mapped to zero - as usual */
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		return;
	} else if (the_result && longrc) {
		/* READ CAPACITY(16) has been failed */
1348 1349 1350 1351
		sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
		sd_print_result(sdkp, the_result);
		sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");

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		sdkp->capacity = 1 + (sector_t) 0xffffffff;		
		goto got_data;
	}	
	
	if (!longrc) {
		sector_size = (buffer[4] << 24) |
			(buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
		if (buffer[0] == 0xff && buffer[1] == 0xff &&
		    buffer[2] == 0xff && buffer[3] == 0xff) {
			if(sizeof(sdkp->capacity) > 4) {
1362 1363
				sd_printk(KERN_NOTICE, sdkp, "Very big device. "
					  "Trying to use READ CAPACITY(16).\n");
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				longrc = 1;
				goto repeat;
			}
1367 1368 1369
			sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
				  "a kernel compiled with support for large "
				  "block devices.\n");
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			sdkp->capacity = 0;
			goto got_data;
		}
		sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
			(buffer[1] << 16) |
			(buffer[2] << 8) |
			buffer[3]);			
	} else {
		sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
			((u64)buffer[1] << 48) |
			((u64)buffer[2] << 40) |
			((u64)buffer[3] << 32) |
			((sector_t)buffer[4] << 24) |
			((sector_t)buffer[5] << 16) |
			((sector_t)buffer[6] << 8)  |
			(sector_t)buffer[7]);
			
		sector_size = (buffer[8] << 24) |
			(buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1389 1390

		sd_read_protection_type(sdkp, buffer);
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	}	

	/* Some devices return the total number of sectors, not the
	 * highest sector number.  Make the necessary adjustment. */
1395
	if (sdp->fix_capacity) {
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		--sdkp->capacity;

1398 1399 1400 1401 1402 1403 1404 1405 1406
	/* Some devices have version which report the correct sizes
	 * and others which do not. We guess size according to a heuristic
	 * and err on the side of lowering the capacity. */
	} else {
		if (sdp->guess_capacity)
			if (sdkp->capacity & 0x01) /* odd sizes are odd */
				--sdkp->capacity;
	}

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got_data:
	if (sector_size == 0) {
		sector_size = 512;
1410 1411
		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) {
1419 1420
		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;
	}
1436 1437
	blk_queue_hardsect_size(sdp->request_queue, sector_size);

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	{
1439 1440
		char cap_str_2[10], cap_str_10[10];
		u64 sz = sdkp->capacity << ffz(~sector_size);
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1442 1443 1444 1445
		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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1447
		sd_printk(KERN_NOTICE, sdkp,
1448
			  "%llu %d-byte hardware sectors: (%s/%s)\n",
1449
			  (unsigned long long)sdkp->capacity,
1450
			  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
1468 1469 1470
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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{
1472
	return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1473
			       SD_TIMEOUT, SD_MAX_RETRIES, data,
1474
			       sshdr);
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}

/*
 * read write protect setting, if possible - called only in sd_revalidate_disk()
1479
 * called with buffer of length SD_BUF_SIZE
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 */
static void
1482
sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1483
{
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	int res;
1485
	struct scsi_device *sdp = sdkp->device;
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	struct scsi_mode_data data;

	set_disk_ro(sdkp->disk, 0);
1489
	if (sdp->skip_ms_page_3f) {
1490
		sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
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		return;
	}

1494 1495
	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.
		 */
1502
		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))
1511
			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))
1517 1518
			res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
					       &data, NULL);
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	}

	if (!scsi_status_is_good(res)) {
1522 1523
		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);
1527 1528 1529 1530 1531
		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()
1537
 * called with buffer of length SD_BUF_SIZE
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 */
static void
1540
sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1541
{
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	int len = 0, res;
1543
	struct scsi_device *sdp = sdkp->device;
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1545 1546
	int dbd;
	int modepage;
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	struct scsi_mode_data data;
	struct scsi_sense_hdr sshdr;

1550
	if (sdp->skip_ms_page_8)
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		goto defaults;

1553
	if (sdp->type == TYPE_RBC) {
1554 1555 1556 1557 1558 1559 1560
		modepage = 6;
		dbd = 8;
	} else {
		modepage = 8;
		dbd = 0;
	}

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	/* cautiously ask */
1562
	res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
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	if (!scsi_status_is_good(res))
		goto bad_sense;

1567 1568
	if (!data.header_length) {
		modepage = 6;
1569
		sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1570 1571
	}

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	/* 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;
1586 1587
	if (len > SD_BUF_SIZE)
		goto bad_sense;
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	/* Get the data */
1590
	res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
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	if (scsi_status_is_good(res)) {
1593
		int offset = data.header_length + data.block_descriptor_length;
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1595
		if (offset >= SD_BUF_SIZE - 2) {
1596
			sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1597 1598 1599
			goto defaults;
		}

1600
		if ((buffer[offset] & 0x3f) != modepage) {
1601
			sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1602 1603 1604 1605 1606 1607 1608 1609 1610 1611
			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;
		}
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		sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
		if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1615 1616
			sd_printk(KERN_NOTICE, sdkp,
				  "Uses READ/WRITE(6), disabling FUA\n");
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			sdkp->DPOFUA = 0;
		}

1620 1621
		sd_printk(KERN_NOTICE, sdkp,
		       "Write cache: %s, read cache: %s, %s\n",
1622 1623 1624 1625
		       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
1626 1627 1628 1629 1630

		return;
	}

bad_sense:
1631
	if (scsi_sense_valid(&sshdr) &&
L
Linus Torvalds 已提交
1632 1633
	    sshdr.sense_key == ILLEGAL_REQUEST &&
	    sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1634 1635
		/* Invalid field in CDB */
		sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
L
Linus Torvalds 已提交
1636
	else
1637
		sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
L
Linus Torvalds 已提交
1638 1639

defaults:
1640
	sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
L
Linus Torvalds 已提交
1641 1642
	sdkp->WCE = 0;
	sdkp->RCD = 0;
1643
	sdkp->DPOFUA = 0;
L
Linus Torvalds 已提交
1644 1645
}

1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
/*
 * 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
1692 1693 1694 1695 1696 1697 1698 1699 1700 1701
/**
 *	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;
1702
	unsigned ordered;
L
Linus Torvalds 已提交
1703

1704 1705
	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
				      "sd_revalidate_disk\n"));
L
Linus Torvalds 已提交
1706 1707 1708 1709 1710 1711 1712 1713

	/*
	 * 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
1714
	buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
L
Linus Torvalds 已提交
1715
	if (!buffer) {
1716 1717
		sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
			  "allocation failure.\n");
1718
		goto out;
L
Linus Torvalds 已提交
1719 1720 1721 1722 1723 1724 1725 1726 1727
	}

	/* 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;
1728
	sdkp->ATO = 0;
L
Linus Torvalds 已提交
1729

1730
	sd_spinup_disk(sdkp);
L
Linus Torvalds 已提交
1731 1732 1733 1734 1735 1736

	/*
	 * Without media there is no reason to ask; moreover, some devices
	 * react badly if we do.
	 */
	if (sdkp->media_present) {
1737 1738 1739
		sd_read_capacity(sdkp, buffer);
		sd_read_write_protect_flag(sdkp, buffer);
		sd_read_cache_type(sdkp, buffer);
1740
		sd_read_app_tag_own(sdkp, buffer);
L
Linus Torvalds 已提交
1741
	}
1742 1743 1744 1745 1746 1747 1748 1749

	/*
	 * 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
1750 1751
		ordered = sdkp->DPOFUA
			? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1752 1753 1754 1755 1756
	else
		ordered = QUEUE_ORDERED_DRAIN;

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

L
Linus Torvalds 已提交
1757 1758 1759 1760 1761 1762 1763
	set_capacity(disk, sdkp->capacity);
	kfree(buffer);

 out:
	return 0;
}

1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
/**
 *	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;
}

L
Linus Torvalds 已提交
1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836
/**
 *	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;
1837
	if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
L
Linus Torvalds 已提交
1838 1839
		goto out;

1840 1841
	SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
					"sd_attach\n"));
L
Linus Torvalds 已提交
1842 1843

	error = -ENOMEM;
J
Jes Sorensen 已提交
1844
	sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
L
Linus Torvalds 已提交
1845 1846 1847
	if (!sdkp)
		goto out;

1848
	gd = alloc_disk(SD_MINORS);
L
Linus Torvalds 已提交
1849 1850 1851
	if (!gd)
		goto out_free;

1852 1853 1854
	do {
		if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
			goto out_put;
L
Linus Torvalds 已提交
1855

1856 1857
		error = ida_get_new(&sd_index_ida, &index);
	} while (error == -EAGAIN);
L
Linus Torvalds 已提交
1858 1859 1860 1861

	if (error)
		goto out_put;

1862 1863
	error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
	if (error)
1864 1865
		goto out_free_index;

L
Linus Torvalds 已提交
1866 1867 1868 1869 1870
	sdkp->device = sdp;
	sdkp->driver = &sd_template;
	sdkp->disk = gd;
	sdkp->index = index;
	sdkp->openers = 0;
1871
	sdkp->previous_state = 1;
L
Linus Torvalds 已提交
1872

J
Jens Axboe 已提交
1873
	if (!sdp->request_queue->rq_timeout) {
1874
		if (sdp->type != TYPE_MOD)
J
Jens Axboe 已提交
1875
			blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
L
Linus Torvalds 已提交
1876
		else
J
Jens Axboe 已提交
1877 1878
			blk_queue_rq_timeout(sdp->request_queue,
					     SD_MOD_TIMEOUT);
L
Linus Torvalds 已提交
1879 1880
	}

1881 1882 1883 1884
	device_initialize(&sdkp->dev);
	sdkp->dev.parent = &sdp->sdev_gendev;
	sdkp->dev.class = &sd_disk_class;
	strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1885

1886
	if (device_add(&sdkp->dev))
1887
		goto out_free_index;
1888 1889 1890

	get_device(&sdp->sdev_gendev);

1891 1892 1893 1894
	if (index < SD_MAX_DISKS) {
		gd->major = sd_major((index & 0xf0) >> 4);
		gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
		gd->minors = SD_MINORS;
L
Linus Torvalds 已提交
1895
	}
1896
	gd->fops = &sd_fops;
L
Linus Torvalds 已提交
1897
	gd->private_data = &sdkp->driver;
1898
	gd->queue = sdkp->device->request_queue;
L
Linus Torvalds 已提交
1899 1900 1901

	sd_revalidate_disk(gd);

1902
	blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
1903

L
Linus Torvalds 已提交
1904
	gd->driverfs_dev = &sdp->sdev_gendev;
1905
	gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
L
Linus Torvalds 已提交
1906 1907 1908 1909 1910
	if (sdp->removable)
		gd->flags |= GENHD_FL_REMOVABLE;

	dev_set_drvdata(dev, sdkp);
	add_disk(gd);
1911
	sd_dif_config_host(sdkp);
L
Linus Torvalds 已提交
1912

1913 1914
	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
		  sdp->removable ? "removable " : "");
L
Linus Torvalds 已提交
1915 1916 1917

	return 0;

1918 1919
 out_free_index:
	ida_remove(&sd_index_ida, index);
1920
 out_put:
L
Linus Torvalds 已提交
1921
	put_disk(gd);
1922
 out_free:
L
Linus Torvalds 已提交
1923
	kfree(sdkp);
1924
 out:
L
Linus Torvalds 已提交
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942
	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);

1943
	device_del(&sdkp->dev);
L
Linus Torvalds 已提交
1944 1945
	del_gendisk(sdkp->disk);
	sd_shutdown(dev);
A
Alan Stern 已提交
1946

1947
	mutex_lock(&sd_ref_mutex);
A
Alan Stern 已提交
1948
	dev_set_drvdata(dev, NULL);
1949
	put_device(&sdkp->dev);
1950
	mutex_unlock(&sd_ref_mutex);
L
Linus Torvalds 已提交
1951 1952 1953 1954 1955 1956

	return 0;
}

/**
 *	scsi_disk_release - Called to free the scsi_disk structure
1957
 *	@dev: pointer to embedded class device
L
Linus Torvalds 已提交
1958
 *
1959
 *	sd_ref_mutex must be held entering this routine.  Because it is
L
Linus Torvalds 已提交
1960 1961
 *	called on last put, you should always use the scsi_disk_get()
 *	scsi_disk_put() helpers which manipulate the semaphore directly
1962
 *	and never do a direct put_device.
L
Linus Torvalds 已提交
1963
 **/
1964
static void scsi_disk_release(struct device *dev)
L
Linus Torvalds 已提交
1965
{
1966
	struct scsi_disk *sdkp = to_scsi_disk(dev);
L
Linus Torvalds 已提交
1967 1968
	struct gendisk *disk = sdkp->disk;
	
1969
	ida_remove(&sd_index_ida, sdkp->index);
L
Linus Torvalds 已提交
1970 1971 1972

	disk->private_data = NULL;
	put_disk(disk);
A
Alan Stern 已提交
1973
	put_device(&sdkp->device->sdev_gendev);
L
Linus Torvalds 已提交
1974 1975 1976 1977

	kfree(sdkp);
}

1978
static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
1979 1980 1981
{
	unsigned char cmd[6] = { START_STOP };	/* START_VALID */
	struct scsi_sense_hdr sshdr;
1982
	struct scsi_device *sdp = sdkp->device;
1983 1984 1985 1986 1987
	int res;

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

1988 1989 1990
	if (sdp->start_stop_pwr_cond)
		cmd[4] |= start ? 1 << 4 : 3 << 4;	/* Active or Standby */

1991 1992 1993 1994 1995 1996
	if (!scsi_device_online(sdp))
		return -ENODEV;

	res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
			       SD_TIMEOUT, SD_MAX_RETRIES);
	if (res) {
1997 1998
		sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
		sd_print_result(sdkp, res);
1999
		if (driver_byte(res) & DRIVER_SENSE)
2000
			sd_print_sense_hdr(sdkp, &sshdr);
2001 2002 2003 2004 2005
	}

	return res;
}

L
Linus Torvalds 已提交
2006 2007 2008 2009 2010 2011 2012
/*
 * 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
2013
	struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
L
Linus Torvalds 已提交
2014 2015 2016 2017

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

A
Alan Stern 已提交
2018
	if (sdkp->WCE) {
2019 2020
		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
		sd_sync_cache(sdkp);
A
Alan Stern 已提交
2021
	}
2022

2023 2024 2025
	if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
		sd_start_stop_device(sdkp, 0);
2026 2027
	}

A
Alan Stern 已提交
2028 2029
	scsi_disk_put(sdkp);
}
L
Linus Torvalds 已提交
2030

2031 2032 2033
static int sd_suspend(struct device *dev, pm_message_t mesg)
{
	struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2034
	int ret = 0;
2035 2036 2037 2038 2039

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

	if (sdkp->WCE) {
2040
		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2041 2042
		ret = sd_sync_cache(sdkp);
		if (ret)
2043
			goto done;
2044 2045
	}

2046
	if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2047 2048
		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
		ret = sd_start_stop_device(sdkp, 0);
2049 2050
	}

2051 2052 2053
done:
	scsi_disk_put(sdkp);
	return ret;
2054 2055 2056 2057 2058
}

static int sd_resume(struct device *dev)
{
	struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2059
	int ret = 0;
2060

2061
	if (!sdkp->device->manage_start_stop)
2062
		goto done;
2063

2064
	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2065
	ret = sd_start_stop_device(sdkp, 1);
2066

2067 2068 2069
done:
	scsi_disk_put(sdkp);
	return ret;
2070 2071
}

L
Linus Torvalds 已提交
2072 2073 2074 2075 2076 2077 2078 2079
/**
 *	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)
{
2080
	int majors = 0, i, err;
L
Linus Torvalds 已提交
2081 2082 2083 2084 2085 2086 2087 2088 2089 2090

	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;

2091 2092 2093
	err = class_register(&sd_disk_class);
	if (err)
		goto err_out;
2094

2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106
	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;
L
Linus Torvalds 已提交
2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
}

/**
 *	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);
2121 2122
	class_unregister(&sd_disk_class);

L
Linus Torvalds 已提交
2123 2124 2125 2126 2127 2128
	for (i = 0; i < SD_MAJORS; i++)
		unregister_blkdev(sd_major(i), "sd");
}

module_init(init_sd);
module_exit(exit_sd);
2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144

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);
}