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The LITMUS^RT kernel.

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author	Heiko Carstens <heiko.carstens@de.ibm.com>	2013-02-21 10:57:42 -0500
committer	Martin Schwidefsky <schwidefsky@de.ibm.com>	2013-02-28 03:37:09 -0500
commit	d12a2970385cfe0c1b0439f53c3ed1055d4dee3e (patch)
tree	2e63d3933409588c922af66d76c89eb1b104415d /tools/perf/scripts/python/Perf-Trace-Util
parent	f45655f6a65538237359abce55edab9cfcc6d82f (diff)

s390/uaccess: remove pointless access_ok() checks

access_ok() always returns 'true' on s390. Therefore all calls are quite pointless and can be removed. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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/*
 *  scsi_lib.c Copyright (C) 1999 Eric Youngdale
 *
 *  SCSI queueing library.
 *      Initial versions: Eric Youngdale (eric@andante.org).
 *                        Based upon conversations with large numbers
 *                        of people at Linux Expo.
 */

#include <linux/bio.h>
#include <linux/bitops.h>
#include <linux/blkdev.h>
#include <linux/completion.h>
#include <linux/kernel.h>
#include <linux/mempool.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hardirq.h>
#include <linux/scatterlist.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_priv.h"
#include "scsi_logging.h"


#define SG_MEMPOOL_NR		ARRAY_SIZE(scsi_sg_pools)
#define SG_MEMPOOL_SIZE		2

struct scsi_host_sg_pool {
	size_t		size;
	char		*name;
	struct kmem_cache	*slab;
	mempool_t	*pool;
};

#define SP(x) { x, "sgpool-" __stringify(x) }
#if (SCSI_MAX_SG_SEGMENTS < 32)
#error SCSI_MAX_SG_SEGMENTS is too small (must be 32 or greater)
#endif
static struct scsi_host_sg_pool scsi_sg_pools[] = {
	SP(8),
	SP(16),
#if (SCSI_MAX_SG_SEGMENTS > 32)
	SP(32),
#if (SCSI_MAX_SG_SEGMENTS > 64)
	SP(64),
#if (SCSI_MAX_SG_SEGMENTS > 128)
	SP(128),
#if (SCSI_MAX_SG_SEGMENTS > 256)
#error SCSI_MAX_SG_SEGMENTS is too large (256 MAX)
#endif
#endif
#endif
#endif
	SP(SCSI_MAX_SG_SEGMENTS)
};
#undef SP

struct kmem_cache *scsi_sdb_cache;

static void scsi_run_queue(struct request_queue *q);

/*
 * Function:	scsi_unprep_request()
 *
 * Purpose:	Remove all preparation done for a request, including its
 *		associated scsi_cmnd, so that it can be requeued.
 *
 * Arguments:	req	- request to unprepare
 *
 * Lock status:	Assumed that no locks are held upon entry.
 *
 * Returns:	Nothing.
 */
static void scsi_unprep_request(struct request *req)
{
	struct scsi_cmnd *cmd = req->special;

	req->cmd_flags &= ~REQ_DONTPREP;
	req->special = NULL;

	scsi_put_command(cmd);
}

/**
 * __scsi_queue_insert - private queue insertion
 * @cmd: The SCSI command being requeued
 * @reason:  The reason for the requeue
 * @unbusy: Whether the queue should be unbusied
 *
 * This is a private queue insertion.  The public interface
 * scsi_queue_insert() always assumes the queue should be unbusied
 * because it's always called before the completion.  This function is
 * for a requeue after completion, which should only occur in this
 * file.
 */
static int __scsi_queue_insert(struct scsi_cmnd *cmd, int reason, int unbusy)
{
	struct Scsi_Host *host = cmd->device->host;
	struct scsi_device *device = cmd->device;
	struct scsi_target *starget = scsi_target(device);
	struct request_queue *q = device->request_queue;
	unsigned long flags;

	SCSI_LOG_MLQUEUE(1,
		 printk("Inserting command %p into mlqueue\n", cmd));

	/*
	 * Set the appropriate busy bit for the device/host.
	 *
	 * If the host/device isn't busy, assume that something actually
	 * completed, and that we should be able to queue a command now.
	 *
	 * Note that the prior mid-layer assumption that any host could
	 * always queue at least one command is now broken.  The mid-layer
	 * will implement a user specifiable stall (see
	 * scsi_host.max_host_blocked and scsi_device.max_device_blocked)
	 * if a command is requeued with no other commands outstanding
	 * either for the device or for the host.
	 */
	switch (reason) {
	case SCSI_MLQUEUE_HOST_BUSY:
		host->host_blocked = host->max_host_blocked;
		break;
	case SCSI_MLQUEUE_DEVICE_BUSY:
		device->device_blocked = device->max_device_blocked;
		break;
	case SCSI_MLQUEUE_TARGET_BUSY:
		starget->target_blocked = starget->max_target_blocked;
		break;
	}

	/*
	 * Decrement the counters, since these commands are no longer
	 * active on the host/device.
	 */
	if (unbusy)
		scsi_device_unbusy(device);

	/*
	 * Requeue this command.  It will go before all other commands
	 * that are already in the queue.
	 *
	 * NOTE: there is magic here about the way the queue is plugged if
	 * we have no outstanding commands.
	 * 
	 * Although we *don't* plug the queue, we call the request
	 * function.  The SCSI request function detects the blocked condition
	 * and plugs the queue appropriately.
         */
	spin_lock_irqsave(q->queue_lock, flags);
	blk_requeue_request(q, cmd->request);
	spin_unlock_irqrestore(q->queue_lock, flags);

	scsi_run_queue(q);

	return 0;
}

/*
 * Function:    scsi_queue_insert()
 *
 * Purpose:     Insert a command in the midlevel queue.
 *
 * Arguments:   cmd    - command that we are adding to queue.
 *              reason - why we are inserting command to queue.
 *
 * Lock status: Assumed that lock is not held upon entry.
 *
 * Returns:     Nothing.
 *
 * Notes:       We do this for one of two cases.  Either the host is busy
 *              and it cannot accept any more commands for the time being,
 *              or the device returned QUEUE_FULL and can accept no more
 *              commands.
 * Notes:       This could be called either from an interrupt context or a
 *              normal process context.
 */
int scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
{
	return __scsi_queue_insert(cmd, reason, 1);
}
/**
 * scsi_execute - insert request and wait for the result
 * @sdev:	scsi device
 * @cmd:	scsi command
 * @data_direction: data direction
 * @buffer:	data buffer
 * @bufflen:	len of buffer
 * @sense:	optional sense buffer
 * @timeout:	request timeout in seconds
 * @retries:	number of times to retry request
 * @flags:	or into request flags;
 * @resid:	optional residual length
 *
 * returns the req->errors value which is the scsi_cmnd result
 * field.
 */
int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
		 int data_direction, void *buffer, unsigned bufflen,
		 unsigned char *sense, int timeout, int retries, int flags,
		 int *resid)
{
	struct request *req;
	int write = (data_direction == DMA_TO_DEVICE);
	int ret = DRIVER_ERROR << 24;

	req = blk_get_request(sdev->request_queue, write, __GFP_WAIT);

	if (bufflen &&	blk_rq_map_kern(sdev->request_queue, req,
					buffer, bufflen, __GFP_WAIT))
		goto out;

	req->cmd_len = COMMAND_SIZE(cmd[0]);
	memcpy(req->cmd, cmd, req->cmd_len);
	req->sense = sense;
	req->sense_len = 0;
	req->retries = retries;
	req->timeout = timeout;
	req->cmd_type = REQ_TYPE_BLOCK_PC;
	req->cmd_flags |= flags | REQ_QUIET | REQ_PREEMPT;

	/*
	 * head injection *required* here otherwise quiesce won't work
	 */
	blk_execute_rq(req->q, NULL, req, 1);

	/*
	 * Some devices (USB mass-storage in particular) may transfer
	 * garbage data together with a residue indicating that the data
	 * is invalid.  Prevent the garbage from being misinterpreted
	 * and prevent security leaks by zeroing out the excess data.
	 */
	if (unlikely(req->resid_len > 0 && req->resid_len <= bufflen))
		memset(buffer + (bufflen - req->resid_len), 0, req->resid_len);

	if (resid)
		*resid = req->resid_len;
	ret = req->errors;
 out:
	blk_put_request(req);

	return ret;
}
EXPORT_SYMBOL(scsi_execute);


int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
		     int data_direction, void *buffer, unsigned bufflen,
		     struct scsi_sense_hdr *sshdr, int timeout, int retries,
		     int *resid)
{
	char *sense = NULL;
	int result;
	
	if (sshdr) {
		sense = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
		if (!sense)
			return DRIVER_ERROR << 24;
	}
	result = scsi_execute(sdev, cmd, data_direction, buffer, bufflen,
			      sense, timeout, retries, 0, resid);
	if (sshdr)
		scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, sshdr);

	kfree(sense);
	return result;
}
EXPORT_SYMBOL(scsi_execute_req);

/*
 * Function:    scsi_init_cmd_errh()
 *
 * Purpose:     Initialize cmd fields related to error handling.
 *
 * Arguments:   cmd	- command that is ready to be queued.
 *
 * Notes:       This function has the job of initializing a number of
 *              fields related to error handling.   Typically this will
 *              be called once for each command, as required.
 */
static void scsi_init_cmd_errh(struct scsi_cmnd *cmd)
{
	cmd->serial_number = 0;
	scsi_set_resid(cmd, 0);
	memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
	if (cmd->cmd_len == 0)
		cmd->cmd_len = scsi_command_size(cmd->cmnd);
}

void scsi_device_unbusy(struct scsi_device *sdev)
{
	struct Scsi_Host *shost = sdev->host;
	struct scsi_target *starget = scsi_target(sdev);
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
	shost->host_busy--;
	starget->target_busy--;
	if (unlikely(scsi_host_in_recovery(shost) &&


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