cregit-Linux how code gets into the kernel

Release 4.11 drivers/scsi/xen-scsifront.c

Directory: drivers/scsi
/*
 * Xen SCSI frontend driver
 *
 * Copyright (c) 2008, FUJITSU Limited
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation; or, when distributed
 * separately from the Linux kernel or incorporated into other
 * software packages, subject to the following license:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this source file (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/wait.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/blkdev.h>
#include <linux/pfn.h>
#include <linux/slab.h>
#include <linux/bitops.h>

#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>

#include <xen/xen.h>
#include <xen/xenbus.h>
#include <xen/grant_table.h>
#include <xen/events.h>
#include <xen/page.h>

#include <xen/interface/grant_table.h>
#include <xen/interface/io/vscsiif.h>
#include <xen/interface/io/protocols.h>

#include <asm/xen/hypervisor.h>



#define GRANT_INVALID_REF	0


#define VSCSIFRONT_OP_ADD_LUN	1

#define VSCSIFRONT_OP_DEL_LUN	2

#define VSCSIFRONT_OP_READD_LUN	3

/* Tuning point. */

#define VSCSIIF_DEFAULT_CMD_PER_LUN 10

#define VSCSIIF_MAX_TARGET          64

#define VSCSIIF_MAX_LUN             255


#define VSCSIIF_RING_SIZE	__CONST_RING_SIZE(vscsiif, PAGE_SIZE)

#define VSCSIIF_MAX_REQS	VSCSIIF_RING_SIZE


#define vscsiif_grants_sg(_sg)	(PFN_UP((_sg) *         \
                                sizeof(struct scsiif_request_segment)))


struct vscsifrnt_shadow {
	/* command between backend and frontend */
	
unsigned char act;
	
uint8_t nr_segments;
	
uint16_t rqid;
	
uint16_t ref_rqid;

	
unsigned int nr_grants;		/* number of grants in gref[] */
	
struct scsiif_request_segment *sg;	/* scatter/gather elements */
	
struct scsiif_request_segment seg[VSCSIIF_SG_TABLESIZE];

	/* Do reset or abort function. */
	
wait_queue_head_t wq_reset;	/* reset work queue           */
	
int wait_reset;			/* reset work queue condition */
	
int32_t rslt_reset;		/* reset response status:     */
					/* SUCCESS or FAILED or:      */

#define RSLT_RESET_WAITING	0

#define RSLT_RESET_ERR		-1

	/* Requested struct scsi_cmnd is stored from kernel. */
	
struct scsi_cmnd *sc;
	
int gref[vscsiif_grants_sg(SG_ALL) + SG_ALL];
};


struct vscsifrnt_info {
	
struct xenbus_device *dev;

	
struct Scsi_Host *host;
	
int host_active;

	
unsigned int evtchn;
	
unsigned int irq;

	
grant_ref_t ring_ref;
	
struct vscsiif_front_ring ring;
	
struct vscsiif_response	ring_rsp;

	
spinlock_t shadow_lock;
	DECLARE_BITMAP(shadow_free_bitmap, VSCSIIF_MAX_REQS);
	
struct vscsifrnt_shadow *shadow[VSCSIIF_MAX_REQS];

	/* Following items are protected by the host lock. */
	
wait_queue_head_t wq_sync;
	
wait_queue_head_t wq_pause;
	
unsigned int wait_ring_available:1;
	
unsigned int waiting_pause:1;
	
unsigned int pause:1;
	
unsigned callers;

	
char dev_state_path[64];
	
struct task_struct *curr;
};

static DEFINE_MUTEX(scsifront_mutex);




static void scsifront_wake_up(struct vscsifrnt_info *info)
{
	info->wait_ring_available = 0;
	wake_up(&info->wq_sync);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross25100.00%1100.00%


Total25100.00%1100.00%






static int scsifront_get_rqid(struct vscsifrnt_info *info)
{
	unsigned long flags;
	int free;

	spin_lock_irqsave(&info->shadow_lock, flags);

	free = find_first_bit(info->shadow_free_bitmap, VSCSIIF_MAX_REQS);
	__clear_bit(free, info->shadow_free_bitmap);

	spin_unlock_irqrestore(&info->shadow_lock, flags);

	return free;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross61100.00%1100.00%


Total61100.00%1100.00%






static int _scsifront_put_rqid(struct vscsifrnt_info *info, uint32_t id)
{
	int empty = bitmap_empty(info->shadow_free_bitmap, VSCSIIF_MAX_REQS);

	__set_bit(id, info->shadow_free_bitmap);
	info->shadow[id] = NULL;

	return empty || info->wait_ring_available;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross51100.00%1100.00%


Total51100.00%1100.00%






static void scsifront_put_rqid(struct vscsifrnt_info *info, uint32_t id)
{
	unsigned long flags;
	int kick;

	spin_lock_irqsave(&info->shadow_lock, flags);
	kick = _scsifront_put_rqid(info, id);
	spin_unlock_irqrestore(&info->shadow_lock, flags);

	if (kick)
		scsifront_wake_up(info);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross59100.00%1100.00%


Total59100.00%1100.00%






static int scsifront_do_request(struct vscsifrnt_info *info,
				struct vscsifrnt_shadow *shadow)
{
	struct vscsiif_front_ring *ring = &(info->ring);
	struct vscsiif_request *ring_req;
	struct scsi_cmnd *sc = shadow->sc;
	uint32_t id;
	int i, notify;

	if (RING_FULL(&info->ring))
		return -EBUSY;

	id = scsifront_get_rqid(info);	/* use id in response */
	if (id >= VSCSIIF_MAX_REQS)
		return -EBUSY;

	info->shadow[id] = shadow;
	shadow->rqid = id;

	ring_req = RING_GET_REQUEST(&(info->ring), ring->req_prod_pvt);
	ring->req_prod_pvt++;

	ring_req->rqid        = id;
	ring_req->act         = shadow->act;
	ring_req->ref_rqid    = shadow->ref_rqid;
	ring_req->nr_segments = shadow->nr_segments;

	ring_req->id      = sc->device->id;
	ring_req->lun     = sc->device->lun;
	ring_req->channel = sc->device->channel;
	ring_req->cmd_len = sc->cmd_len;

	BUG_ON(sc->cmd_len > VSCSIIF_MAX_COMMAND_SIZE);

	memcpy(ring_req->cmnd, sc->cmnd, sc->cmd_len);

	ring_req->sc_data_direction   = (uint8_t)sc->sc_data_direction;
	ring_req->timeout_per_command = sc->request->timeout / HZ;

	for (i = 0; i < (shadow->nr_segments & ~VSCSIIF_SG_GRANT); i++)
		ring_req->seg[i] = shadow->seg[i];

	RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(ring, notify);
	if (notify)
		notify_remote_via_irq(info->irq);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross288100.00%2100.00%


Total288100.00%2100.00%






static void scsifront_gnttab_done(struct vscsifrnt_info *info,
				  struct vscsifrnt_shadow *shadow)
{
	int i;

	if (shadow->sc->sc_data_direction == DMA_NONE)
		return;

	for (i = 0; i < shadow->nr_grants; i++) {
		if (unlikely(gnttab_query_foreign_access(shadow->gref[i]))) {
			shost_printk(KERN_ALERT, info->host, KBUILD_MODNAME
				     "grant still in use by backend\n");
			BUG();
		}
		gnttab_end_foreign_access(shadow->gref[i], 0, 0UL);
	}

	kfree(shadow->sg);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross100100.00%2100.00%


Total100100.00%2100.00%






static void scsifront_cdb_cmd_done(struct vscsifrnt_info *info,
				   struct vscsiif_response *ring_rsp)
{
	struct vscsifrnt_shadow *shadow;
	struct scsi_cmnd *sc;
	uint32_t id;
	uint8_t sense_len;

	id = ring_rsp->rqid;
	shadow = info->shadow[id];
	sc = shadow->sc;

	BUG_ON(sc == NULL);

	scsifront_gnttab_done(info, shadow);
	scsifront_put_rqid(info, id);

	sc->result = ring_rsp->rslt;
	scsi_set_resid(sc, ring_rsp->residual_len);

	sense_len = min_t(uint8_t, VSCSIIF_SENSE_BUFFERSIZE,
			  ring_rsp->sense_len);

	if (sense_len)
		memcpy(sc->sense_buffer, ring_rsp->sense_buffer, sense_len);

	sc->scsi_done(sc);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross128100.00%2100.00%


Total128100.00%2100.00%






static void scsifront_sync_cmd_done(struct vscsifrnt_info *info,
				    struct vscsiif_response *ring_rsp)
{
	uint16_t id = ring_rsp->rqid;
	unsigned long flags;
	struct vscsifrnt_shadow *shadow = info->shadow[id];
	int kick;

	spin_lock_irqsave(&info->shadow_lock, flags);
	shadow->wait_reset = 1;
	switch (shadow->rslt_reset) {
	case RSLT_RESET_WAITING:
		shadow->rslt_reset = ring_rsp->rslt;
		break;
	case RSLT_RESET_ERR:
		kick = _scsifront_put_rqid(info, id);
		spin_unlock_irqrestore(&info->shadow_lock, flags);
		kfree(shadow);
		if (kick)
			scsifront_wake_up(info);
		return;
	default:
		shost_printk(KERN_ERR, info->host, KBUILD_MODNAME
			     "bad reset state %d, possibly leaking %u\n",
			     shadow->rslt_reset, id);
		break;
	}
	spin_unlock_irqrestore(&info->shadow_lock, flags);

	wake_up(&shadow->wq_reset);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross153100.00%1100.00%


Total153100.00%1100.00%






static void scsifront_do_response(struct vscsifrnt_info *info,
				  struct vscsiif_response *ring_rsp)
{
	if (WARN(ring_rsp->rqid >= VSCSIIF_MAX_REQS ||
		 test_bit(ring_rsp->rqid, info->shadow_free_bitmap),
		 "illegal rqid %u returned by backend!\n", ring_rsp->rqid))
		return;

	if (info->shadow[ring_rsp->rqid]->act == VSCSIIF_ACT_SCSI_CDB)
		scsifront_cdb_cmd_done(info, ring_rsp);
	else
		scsifront_sync_cmd_done(info, ring_rsp);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross75100.00%1100.00%


Total75100.00%1100.00%






static int scsifront_ring_drain(struct vscsifrnt_info *info)
{
	struct vscsiif_response *ring_rsp;
	RING_IDX i, rp;
	int more_to_do = 0;

	rp = info->ring.sring->rsp_prod;
	rmb();	/* ordering required respective to dom0 */
	for (i = info->ring.rsp_cons; i != rp; i++) {
		ring_rsp = RING_GET_RESPONSE(&info->ring, i);
		scsifront_do_response(info, ring_rsp);
	}

	info->ring.rsp_cons = i;

	if (i != info->ring.req_prod_pvt)
		RING_FINAL_CHECK_FOR_RESPONSES(&info->ring, more_to_do);
	else
		info->ring.sring->rsp_event = i + 1;

	return more_to_do;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross122100.00%2100.00%


Total122100.00%2100.00%






static int scsifront_cmd_done(struct vscsifrnt_info *info)
{
	int more_to_do;
	unsigned long flags;

	spin_lock_irqsave(info->host->host_lock, flags);

	more_to_do = scsifront_ring_drain(info);

	info->wait_ring_available = 0;

	spin_unlock_irqrestore(info->host->host_lock, flags);

	wake_up(&info->wq_sync);

	return more_to_do;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross64100.00%2100.00%


Total64100.00%2100.00%






static irqreturn_t scsifront_irq_fn(int irq, void *dev_id)
{
	struct vscsifrnt_info *info = dev_id;

	while (scsifront_cmd_done(info))
		/* Yield point for this unbounded loop. */
		cond_resched();

	return IRQ_HANDLED;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross34100.00%1100.00%


Total34100.00%1100.00%






static void scsifront_finish_all(struct vscsifrnt_info *info)
{
	unsigned i;
	struct vscsiif_response resp;

	scsifront_ring_drain(info);

	for (i = 0; i < VSCSIIF_MAX_REQS; i++) {
		if (test_bit(i, info->shadow_free_bitmap))
			continue;
		resp.rqid = i;
		resp.sense_len = 0;
		resp.rslt = DID_RESET << 16;
		resp.residual_len = 0;
		scsifront_do_response(info, &resp);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross84100.00%2100.00%


Total84100.00%2100.00%






static int map_data_for_request(struct vscsifrnt_info *info,
				struct scsi_cmnd *sc,
				struct vscsifrnt_shadow *shadow)
{
	grant_ref_t gref_head;
	struct page *page;
	int err, ref, ref_cnt = 0;
	int grant_ro = (sc->sc_data_direction == DMA_TO_DEVICE);
	unsigned int i, off, len, bytes;
	unsigned int data_len = scsi_bufflen(sc);
	unsigned int data_grants = 0, seg_grants = 0;
	struct scatterlist *sg;
	struct scsiif_request_segment *seg;

	if (sc->sc_data_direction == DMA_NONE || !data_len)
		return 0;

	scsi_for_each_sg(sc, sg, scsi_sg_count(sc), i)
		data_grants += PFN_UP(sg->offset + sg->length);

	if (data_grants > VSCSIIF_SG_TABLESIZE) {
		if (data_grants > info->host->sg_tablesize) {
			shost_printk(KERN_ERR, info->host, KBUILD_MODNAME
			     "Unable to map request_buffer for command!\n");
			return -E2BIG;
		}
		seg_grants = vscsiif_grants_sg(data_grants);
		shadow->sg = kcalloc(data_grants,
			sizeof(struct scsiif_request_segment), GFP_ATOMIC);
		if (!shadow->sg)
			return -ENOMEM;
	}
	seg = shadow->sg ? : shadow->seg;

	err = gnttab_alloc_grant_references(seg_grants + data_grants,
					    &gref_head);
	if (err) {
		kfree(shadow->sg);
		shost_printk(KERN_ERR, info->host, KBUILD_MODNAME
			     "gnttab_alloc_grant_references() error\n");
		return -ENOMEM;
	}

	if (seg_grants) {
		page = virt_to_page(seg);
		off = (unsigned long)seg & ~PAGE_MASK;
		len = sizeof(struct scsiif_request_segment) * data_grants;
		while (len > 0) {
			bytes = min_t(unsigned int, len, PAGE_SIZE - off);

			ref = gnttab_claim_grant_reference(&gref_head);
			BUG_ON(ref == -ENOSPC);

			gnttab_grant_foreign_access_ref(ref,
				info->dev->otherend_id,
				xen_page_to_gfn(page), 1);
			shadow->gref[ref_cnt] = ref;
			shadow->seg[ref_cnt].gref   = ref;
			shadow->seg[ref_cnt].offset = (uint16_t)off;
			shadow->seg[ref_cnt].length = (uint16_t)bytes;

			page++;
			len -= bytes;
			off = 0;
			ref_cnt++;
		}
		BUG_ON(seg_grants < ref_cnt);
		seg_grants = ref_cnt;
	}

	scsi_for_each_sg(sc, sg, scsi_sg_count(sc), i) {
		page = sg_page(sg);
		off = sg->offset;
		len = sg->length;

		while (len > 0 && data_len > 0) {
			/*
                         * sg sends a scatterlist that is larger than
                         * the data_len it wants transferred for certain
                         * IO sizes.
                         */
			bytes = min_t(unsigned int, len, PAGE_SIZE - off);
			bytes = min(bytes, data_len);

			ref = gnttab_claim_grant_reference(&gref_head);
			BUG_ON(ref == -ENOSPC);

			gnttab_grant_foreign_access_ref(ref,
				info->dev->otherend_id,
				xen_page_to_gfn(page),
				grant_ro);

			shadow->gref[ref_cnt] = ref;
			seg->gref   = ref;
			seg->offset = (uint16_t)off;
			seg->length = (uint16_t)bytes;

			page++;
			seg++;
			len -= bytes;
			data_len -= bytes;
			off = 0;
			ref_cnt++;
		}
	}

	if (seg_grants)
		shadow->nr_segments = VSCSIIF_SG_GRANT | seg_grants;
	else
		shadow->nr_segments = (uint8_t)ref_cnt;
	shadow->nr_grants = ref_cnt;

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross58298.48%360.00%


Julien Grall81.35%120.00%


Dan Carpenter10.17%120.00%


Total591100.00%5100.00%






static int scsifront_enter(struct vscsifrnt_info *info)
{
	if (info->pause)
		return 1;
	info->callers++;
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross28100.00%1100.00%


Total28100.00%1100.00%






static void scsifront_return(struct vscsifrnt_info *info)
{
	info->callers--;
	if (info->callers)
		return;

	if (!info->waiting_pause)
		return;

	info->waiting_pause = 0;
	wake_up(&info->wq_pause);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross45100.00%1100.00%


Total45100.00%1100.00%






static int scsifront_queuecommand(struct Scsi_Host *shost,
				  struct scsi_cmnd *sc)
{
	struct vscsifrnt_info *info = shost_priv(shost);
	struct vscsifrnt_shadow *shadow = scsi_cmd_priv(sc);
	unsigned long flags;
	int err;

	sc->result = 0;
	memset(shadow, 0, sizeof(*shadow));

	shadow->sc  = sc;
	shadow->act = VSCSIIF_ACT_SCSI_CDB;

	spin_lock_irqsave(shost->host_lock, flags);
	if (scsifront_enter(info)) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		return SCSI_MLQUEUE_HOST_BUSY;
	}

	err = map_data_for_request(info, sc, shadow);
	if (err < 0) {
		pr_debug("%s: err %d\n", __func__, err);
		scsifront_return(info);
		spin_unlock_irqrestore(shost->host_lock, flags);
		if (err == -ENOMEM)
			return SCSI_MLQUEUE_HOST_BUSY;
		sc->result = DID_ERROR << 16;
		sc->scsi_done(sc);
		return 0;
	}

	if (scsifront_do_request(info, shadow)) {
		scsifront_gnttab_done(info, shadow);
		goto busy;
	}

	scsifront_return(info);
	spin_unlock_irqrestore(shost->host_lock, flags);

	return 0;

busy:
	scsifront_return(info);
	spin_unlock_irqrestore(shost->host_lock, flags);
	pr_debug("%s: busy\n", __func__);
	return SCSI_MLQUEUE_HOST_BUSY;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross238100.00%3100.00%


Total238100.00%3100.00%



/*
 * Any exception handling (reset or abort) must be forwarded to the backend.
 * We have to wait until an answer is returned. This answer contains the
 * result to be returned to the requestor.
 */



static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
{
	struct Scsi_Host *host = sc->device->host;
	struct vscsifrnt_info *info = shost_priv(host);
	struct vscsifrnt_shadow *shadow, *s = scsi_cmd_priv(sc);
	int err = 0;

	shadow = kzalloc(sizeof(*shadow), GFP_NOIO);
	if (!shadow)
		return FAILED;

	shadow->act = act;
	shadow->rslt_reset = RSLT_RESET_WAITING;
	shadow->sc = sc;
	shadow->ref_rqid = s->rqid;
	init_waitqueue_head(&shadow->wq_reset);

	spin_lock_irq(host->host_lock);

	for (;;) {
		if (scsifront_enter(info))
			goto fail;

		if (!scsifront_do_request(info, shadow))
			break;

		scsifront_return(info);
		if (err)
			goto fail;
		info->wait_ring_available = 1;
		spin_unlock_irq(host->host_lock);
		err = wait_event_interruptible(info->wq_sync,
					       !info->wait_ring_available);
		spin_lock_irq(host->host_lock);
	}

	spin_unlock_irq(host->host_lock);
	err = wait_event_interruptible(shadow->wq_reset, shadow->wait_reset);
	spin_lock_irq(host->host_lock);

	if (!err) {
		err = shadow->rslt_reset;
		scsifront_put_rqid(info, shadow->rqid);
		kfree(shadow);
	} else {
		spin_lock(&info->shadow_lock);
		shadow->rslt_reset = RSLT_RESET_ERR;
		spin_unlock(&info->shadow_lock);
		err = FAILED;
	}

	scsifront_return(info);
	spin_unlock_irq(host->host_lock);
	return err;

fail:
	spin_unlock_irq(host->host_lock);
	kfree(shadow);
	return FAILED;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross29898.03%375.00%


David Vrabel61.97%125.00%


Total304100.00%4100.00%






static int scsifront_eh_abort_handler(struct scsi_cmnd *sc)
{
	pr_debug("%s\n", __func__);
	return scsifront_action_handler(sc, VSCSIIF_ACT_SCSI_ABORT);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross26100.00%1100.00%


Total26100.00%1100.00%






static int scsifront_dev_reset_handler(struct scsi_cmnd *sc)
{
	pr_debug("%s\n", __func__);
	return scsifront_action_handler(sc, VSCSIIF_ACT_SCSI_RESET);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross26100.00%1100.00%


Total26100.00%1100.00%






static int scsifront_sdev_configure(struct scsi_device *sdev)
{
	struct vscsifrnt_info *info = shost_priv(sdev->host);

	if (info && current == info->curr)
		xenbus_printf(XBT_NIL, info->dev->nodename,
			      info->dev_state_path, "%d", XenbusStateConnected);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross55100.00%1100.00%


Total55100.00%1100.00%






static void scsifront_sdev_destroy(struct scsi_device *sdev)
{
	struct vscsifrnt_info *info = shost_priv(sdev->host);

	if (info && current == info->curr)
		xenbus_printf(XBT_NIL, info->dev->nodename,
			      info->dev_state_path, "%d", XenbusStateClosed);
}


Contributors
PersonTokensPropCommitsCommitProp
Juergen Gross52100.00%1100.00%


Total52100.00%1100.00%




static struct scsi_host_template scsifront_sht = {
	.module			= THIS_MODULE,
	.name			= "Xen SCSI frontend driver",
	.queuecommand		= scsifront_queuecommand,
	.eh_abort_handler	= scsifront_eh_abort_handler,
	.eh_device_reset_handler = scsifront_dev_reset_handler,
	.slave_configure	= scsifront_sdev_configure,
	.slave_destroy		= scsifront_sdev_destroy,
	.cmd_per_lun		= VSCSIIF_DEFAULT_CMD_PER_LUN,
	.can_queue		= VSCSIIF_MAX_REQS,
	.this_id		= -1,
	.cmd_size		= sizeof(struct vscsifrnt_shadow),
	.sg_tablesize		= VSCSIIF_SG_TABLESIZE,
	.use_clustering