Re: [PATCH] [Target_Core_Mod/PSCSI]: Added support for ->create_virtdevice_from_fd()

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One follow up "cleanup" commit for support FD export via Linux/PSCSI..

>From a9ca407d4babc04b6fb67635ec4da34b2a1e1d6e Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Tue, 21 Oct 2008 16:06:19 -0700
Subject: [PATCH] [Target_Core_Mod/PSCSI]: Remove debugging tests from struct scsi_device->type

Remove incorrect and unnecessary debugging for struct scsi_device->type checks
in pscsi_create_type_[disk,rom,other]()

Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx>
---
 drivers/lio-core/target_core_pscsi.c |    9 ---------
 1 files changed, 0 insertions(+), 9 deletions(-)

diff --git a/drivers/lio-core/target_core_pscsi.c b/drivers/lio-core/target_core_pscsi.c
index be5c648..045bda8 100644
--- a/drivers/lio-core/target_core_pscsi.c
+++ b/drivers/lio-core/target_core_pscsi.c
@@ -413,9 +413,6 @@ extern se_device_t *pscsi_create_type_disk (struct scsi_device *sd, pscsi_dev_vi
        struct Scsi_Host *sh = sd->host;
        u32 dev_flags = 0;

-       if (sd->type != TYPE_DISK)
-               return(NULL);
-
        if (scsi_device_get(sd)) {
                printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
                        sh->host_no, sd->channel, sd->id, sd->lun);
@@ -453,9 +450,6 @@ extern se_device_t *pscsi_create_type_rom (struct scsi_device *sd, pscsi_dev_vir
        struct Scsi_Host *sh = sd->host;
        u32 dev_flags = 0;

-       if (sd->type != TYPE_ROM)
-               return(NULL);
-
        if (scsi_device_get(sd)) {
                printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
                        sh->host_no, sd->channel, sd->id, sd->lun);
@@ -484,10 +478,7 @@ extern se_device_t *pscsi_create_type_other (struct scsi_device *sd, pscsi_dev_v
        struct Scsi_Host *sh = sd->host;
        u32 dev_flags = 0;

-       if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
-               return(NULL);
        spin_unlock_irq(sh->host_lock);
-
        if (!(dev = pscsi_add_device_to_list(hba, pdv, sd, dev_flags)))
                return(NULL);

-- 
1.5.4.1




On Tue, 2008-10-21 at 13:26 -0700, Nicholas A. Bellinger wrote:
> >From bd4227278bbb6ec911a15b380f2479782cbe94ce Mon Sep 17 00:00:00 2001
> From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
> Date: Mon, 20 Oct 2008 23:35:44 -0700
> Subject: [PATCH] [Target_Core_Mod/PSCSI]: Added support for ->create_virtdevice_from_fd()
> 
> Added se_subsystem_api_t->create_virtdevice_from_fd() for locating (and
> for TYPE_DISK, claiming) struct scsi_device from a passed open file descriptor
> for Linux/SCSI storage objects.
> 
> This patch relies upon commit 362d4ef391699b0282dfbef3da633a561d9cbde7 for
> the target_core_mod configfs infrastructure.
> 
> Here are the FIXMEs specific to configfs/fd and Linux/SCSI:
> 
> *) Determine long term status of struct gendisk->driverfs_dev for
>    locating struct scsi_device from struct inode for Linux/SCSI.
> *) Add support for struct scsi_device's backed by character device.
> *) SCSI CDROM can only be attached through the fd method when medium
>    is in the drive.
> 
> Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx>
> ---
>  drivers/lio-core/target_core_pscsi.c |  385 ++++++++++++++++++++--------------
>  drivers/lio-core/target_core_pscsi.h |    2 +
>  2 files changed, 234 insertions(+), 153 deletions(-)
> 
> diff --git a/drivers/lio-core/target_core_pscsi.c b/drivers/lio-core/target_core_pscsi.c
> index f8fd2d5..be5c648 100644
> --- a/drivers/lio-core/target_core_pscsi.c
> +++ b/drivers/lio-core/target_core_pscsi.c
> @@ -37,6 +37,7 @@
>  #include <linux/spinlock.h>
>  #include <linux/smp_lock.h>
>  #include <linux/genhd.h>
> +#include <linux/file.h>
>  
>  #include <scsi/scsi.h>
>  #include <scsi/scsi_device.h>
> @@ -243,23 +244,8 @@ extern int pscsi_attach_hba (iscsi_portal_group_t *tpg, se_hba_t *hba, se_hbainf
>  	PYXPRINT("CORE_HBA[%d] - Attached Parallel SCSI HBA to Generic Target Core"
>  		" with TCQ Depth: %d MaxSectors: %hu\n", hba->hba_id,
>  		atomic_read(&hba->max_queue_depth), max_sectors);
> -#if 0
> -	/*
> -	 * For Parallel SCSI we assume the devices are already attached to the
> -	 * HBA, so go ahead and scan the bus for devices to export as iSCSI LUNs.
> -	 */
> -	if ((pscsi_dev_count = pscsi_scan_devices(hba, hi)) < 0) {
> -		PYXPRINT("No devices present, ignoring request to add"
> -			" Parallel SCSI HBA %d.\n", sh->host_no);
> -		goto fail;
> -	}
> -#endif		
> +
>  	return(0);
> -#if 0
> -fail:
> -	scsi_host_put(sh);
> -	return(-1);
> -#endif
>  }
>  
>  /*	pscsi_detach_hba(): (Part of se_subsystem_api_t template)
> @@ -280,92 +266,6 @@ extern int pscsi_detach_hba (se_hba_t *hba)
>  	return(0);
>  }
>  
> -/*	pscsi_scan_devices(): (Part of se_subsystem_api_t template)
> - *
> - * 	FIXME: For <= v2.4, check what locking the midlayer does for accessing Scsi_Host->host_queue (if any?)
> - */
> -#if 0
> -extern int pscsi_scan_devices (se_hba_t *iscsi_hba, se_hbainfo_t *hi)
> -{
> -	int pscsi_dev_count = 0;
> -	int dev_flags = 0;
> -	se_device_t *dev;
> -	struct scsi_device *sd;
> -	struct Scsi_Host *sh = (struct Scsi_Host *) iscsi_hba->hba_ptr;
> -
> -	spin_lock_irq(sh->host_lock);
> -	list_for_each_entry(sd, &sh->__devices, siblings) {
> -		if (sd->type == TYPE_DISK) {
> -			if (scsi_device_get(sd))
> -			    continue;
> -
> -			spin_unlock_irq(sh->host_lock);
> -
> -			if (pscsi_check_sd(sd) < 0) {
> -				spin_lock_irq(sh->host_lock);
> -				scsi_device_put(sd);
> -				continue;
> -			}
> -
> -			/*
> -			 * In some cases (namely the iSCSI Initiator Case) we want to
> -			 * grab exclusive access to the underlying Linux block device
> -			 * immediately at this point.  We use parameter that is passed
> -			 * with addhbatotarget to determine when to claim for this case.
> -			 */
> -			if (hi->os_claim_devices) 
> -				if (!(pscsi_claim_sd(sd))) {
> -					dev_flags |= DF_CLAIMED_BLOCKDEV;
> -					dev_flags |= DF_PERSISTENT_CLAIMED_BLOCKDEV;
> -				}
> -			
> -			dev = pscsi_add_device_to_list(iscsi_hba, sd, dev_flags);
> -			
> -			if (dev_flags & DF_CLAIMED_BLOCKDEV) {
> -				dev_flags &= ~DF_CLAIMED_BLOCKDEV;
> -				dev_flags &= ~DF_PERSISTENT_CLAIMED_BLOCKDEV;
> -			}
> -			
> -			spin_lock_irq(sh->host_lock);
> -
> -			if (!dev) {
> -			    scsi_device_put(sd);
> -			    continue;
> -			}
> -			
> -			pscsi_dev_count++;
> -			continue;
> -		}
> -
> -		/*
> -		 * We may need to do peripheral-type specific checking of access counts.
> -		 */
> -//#warning FIXME v2.8: Check usage of scsi_device_get() for non TYPE_DISK
> -		if (sd->type == TYPE_ROM || sd->type == TYPE_TAPE || sd->type == TYPE_MEDIUM_CHANGER) {
> -			spin_unlock_irq(sh->host_lock);
> -			dev = pscsi_add_device_to_list(iscsi_hba, sd, dev_flags);
> -			spin_lock_irq(sh->host_lock);
> -
> -			if (!dev)
> -				continue;
> -			
> -			pscsi_dev_count++;
> -			continue;
> -		}
> -
> -	}
> -	spin_unlock_irq(sh->host_lock);
> -		
> -	if (!pscsi_dev_count)
> -		return(-1);
> -
> -	PYXPRINT("iSCSI_PSCSI[%d] - Detected %d Parallel SCSI Devices\n",
> -			sh->host_no, pscsi_dev_count);
> -
> -	return(pscsi_dev_count);
> -}
> -#endif
> -
>  /*	pscsi_add_device_to_list():
>   *
>   *	FIXME: We are going to want to increment struct scsi_device->access_count
> @@ -504,13 +404,105 @@ extern void *pscsi_allocate_virtdevice (se_hba_t *hba, const char *name)
>  	return((void *)pdv);
>  }
>  
> +/*
> + * Called with struct Scsi_Host->host_lock called.
> + */
> +extern se_device_t *pscsi_create_type_disk (struct scsi_device *sd, pscsi_dev_virt_t *pdv, se_hba_t *hba)
> +{
> +	se_device_t *dev;
> +	struct Scsi_Host *sh = sd->host;
> +	u32 dev_flags = 0;
> +
> +	if (sd->type != TYPE_DISK)
> +		return(NULL);
> +
> +	if (scsi_device_get(sd)) {
> +		printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
> +			sh->host_no, sd->channel, sd->id, sd->lun);
> +		spin_unlock_irq(sh->host_lock);
> +		return(NULL);
> +	}
> +	spin_unlock_irq(sh->host_lock);
> +
> +	if (pscsi_check_sd(sd) < 0) {
> +		scsi_device_put(sd);
> +		printk(KERN_ERR "pscsi_check_sd() failed for %d:%d:%d:%d\n",
> +			sh->host_no, sd->channel, sd->id, sd->lun);
> +		return(NULL);
> +	}
> +	if (!(pscsi_claim_sd(sd))) {
> +		dev_flags |= DF_CLAIMED_BLOCKDEV;
> +		dev_flags |= DF_PERSISTENT_CLAIMED_BLOCKDEV;
> +	}	
> +	if (!(dev = pscsi_add_device_to_list(hba, pdv, sd, dev_flags))) {
> +		scsi_device_put(sd);
> +		return(NULL);
> +	}
> +	PYXPRINT("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d\n",
> +		sh->host_no, sd->channel, sd->id, sd->lun);
> +
> +	return(dev);
> +}
> +
> +/*
> + * Called with struct Scsi_Host->host_lock called.
> + */
> +extern se_device_t *pscsi_create_type_rom (struct scsi_device *sd, pscsi_dev_virt_t *pdv, se_hba_t *hba)
> +{
> +	se_device_t *dev;
> +	struct Scsi_Host *sh = sd->host;
> +	u32 dev_flags = 0;
> +
> +	if (sd->type != TYPE_ROM)
> +		return(NULL);
> +
> +	if (scsi_device_get(sd)) {
> +		printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
> +			sh->host_no, sd->channel, sd->id, sd->lun);
> +		spin_unlock_irq(sh->host_lock);
> +		return(NULL);
> +	}
> +	spin_unlock_irq(sh->host_lock);
> +
> +	if (!(dev = pscsi_add_device_to_list(hba, pdv, sd, dev_flags))) {
> +		scsi_device_put(sd);
> +		return(NULL);
> +	}
> +	PYXPRINT("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d\n",
> +		sh->host_no, scsi_device_type(sd->type), sd->channel,
> +		sd->id, sd->lun);
> +
> +	return(dev);	
> +}
> +
> +/*
> + *Called with struct Scsi_Host->host_lock called.
> + */
> +extern se_device_t *pscsi_create_type_other (struct scsi_device *sd, pscsi_dev_virt_t *pdv, se_hba_t *hba)
> +{
> +	se_device_t *dev;
> +	struct Scsi_Host *sh = sd->host;
> +	u32 dev_flags = 0;
> +
> +	if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
> +		return(NULL);
> +	spin_unlock_irq(sh->host_lock);
> +
> +	if (!(dev = pscsi_add_device_to_list(hba, pdv, sd, dev_flags)))
> +		return(NULL);
> +	
> +	PYXPRINT("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d\n",
> +		sh->host_no, scsi_device_type(sd->type), sd->channel,
> +		sd->id, sd->lun);
> +
> +	return(dev);
> +}
> +
>  extern se_device_t *pscsi_create_virtdevice (se_hba_t *hba, void *p)
>  {
>  	pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *)p;
> -	se_device_t *dev;
>  	struct scsi_device *sd;
>  	struct Scsi_Host *sh = (struct Scsi_Host *) hba->hba_ptr;
> -	u32 dev_flags = 0;
>  
>  	if (!(pdv)) {
>  		printk(KERN_ERR "Unable to locate pscsi_dev_virt_t parameter\n");
> @@ -523,54 +515,17 @@ extern se_device_t *pscsi_create_virtdevice (se_hba_t *hba, void *p)
>  		    !(pdv->pdv_target_id == sd->id) ||
>  		    !(pdv->pdv_lun_id == sd->lun))
>  			continue;
> -
> -		if (sd->type == TYPE_DISK) {
> -			if (scsi_device_get(sd)) {
> -				spin_unlock_irq(sh->host_lock);
> -				printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
> -					sh->host_no, sd->channel, sd->id, sd->lun);
> -				return(NULL);
> -			}
> -			spin_unlock_irq(sh->host_lock);
> -
> -			if (pscsi_check_sd(sd) < 0) {
> -				scsi_device_put(sd);
> -				printk(KERN_ERR "pscsi_check_sd() failed for %d:%d:%d:%d\n",
> -					sh->host_no, sd->channel, sd->id, sd->lun);
> -				return(NULL);
> -			}
> -#warning FIXME: Is this already being done inside target_core_mod..?
> -			if (!(pscsi_claim_sd(sd))) {
> -				dev_flags |= DF_CLAIMED_BLOCKDEV;
> -				dev_flags |= DF_PERSISTENT_CLAIMED_BLOCKDEV;
> -			}
> -
> -			if (!(dev = pscsi_add_device_to_list(hba, pdv, sd, dev_flags))) {
> -				scsi_device_put(sd);
> -				return(NULL);
> -			}	
> -			PYXPRINT("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d\n",
> -				sh->host_no, sd->channel, sd->id, sd->lun);	
> -
> -			return(dev);
> -		}
> -#warning FIXME: Can all NON TYPE_DISK be handled this way..?
> -		if ((sd->type == TYPE_ROM) ||
> -		    (sd->type == TYPE_TAPE) ||
> -		    (sd->type == TYPE_MEDIUM_CHANGER)) {	
> -			spin_unlock_irq(sh->host_lock);
> -
> -			if (!(dev = pscsi_add_device_to_list(hba, pdv, sd, dev_flags)))
> -				return(NULL);	
> -
> -			PYXPRINT("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d\n",
> -				sh->host_no, sd->channel, sd->id, sd->lun);   	
> -
> -			return(dev);
> +		/*
> +		 * Functions will release struct scsi_host->host_lock
> +		 */
> +		switch (sd->type) {
> +		case TYPE_DISK:
> +			return(pscsi_create_type_disk(sd, pdv, hba));
> +		case TYPE_ROM:
> +			return(pscsi_create_type_rom(sd, pdv, hba));
> +		default:
> +			return(pscsi_create_type_other(sd, pdv, hba));
>  		}
> -
> -		printk(KERN_ERR "Unable to process SCSI device type: %d\n", sd->type);
> -		return(NULL);
>  	}
>  	spin_unlock_irq(sh->host_lock);
>  
> @@ -672,8 +627,10 @@ extern void pscsi_free_device (void *p)
>  	pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) p;
>  	struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
>  
> -	if (sd && (sd->type == TYPE_DISK)) {
> -		scsi_device_put(sd);
> +	if (sd) {
> +		if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM)) 
> +			scsi_device_put(sd);
> +
>  		pdv->pdv_sd = NULL;
>  	}
>  	
> @@ -1011,6 +968,128 @@ extern ssize_t pscsi_show_configfs_dev_params (se_hba_t *hba, se_subsystem_dev_t
>  	return((ssize_t)bl);
>  }
>  
> +extern se_device_t *pscsi_create_virtdevice_from_fd (
> +	se_subsystem_dev_t *se_dev,
> +	const char *page)
> +{
> +	pscsi_dev_virt_t *pdv = (pscsi_dev_virt_t *) se_dev->se_dev_su_ptr;
> +	se_device_t *dev = NULL;
> +	se_hba_t *hba = se_dev->se_dev_hba;
> +	struct block_device *bd = NULL;
> +	struct file *filp;
> +	struct gendisk *gd = NULL;
> +	struct inode *inode;
> +	struct scsi_device *sd = NULL;
> +	struct Scsi_Host *sh = (struct Scsi_Host *)hba->hba_ptr;
> +	char *p = (char *)page;
> +	int fd;
> +
> +	fd = simple_strtol(p, &p, 0);
> +	if ((fd < 3 || fd > 7)) {
> +		printk(KERN_ERR "PSCSI: Illegal value of file descriptor: %d\n", fd);
> +		return(ERR_PTR(-EINVAL));
> +	}
> +	if (!(filp = fget(fd))) {
> +		printk(KERN_ERR "PSCSI: Unable to fget() fd: %d\n", fd);
> +		return(ERR_PTR(-EBADF));
> +	}
> +	if (!(inode = igrab(filp->f_mapping->host))) {
> +		printk(KERN_ERR "PSCSI: Unable to locate struct inode for struct"
> +				" block_device fd\n");
> +		fput(filp);
> +		return(ERR_PTR(-EINVAL));
> +	}
> +	/*
> +	 * Look for struct scsi_device with a backing struct block_device.
> +	 *
> +	 * This means struct scsi_device->type == TYPE_DISK && TYPE_ROM.
> +	 */
> +	if (S_ISBLK(inode->i_mode)) {
> +		if (!(bd = I_BDEV(filp->f_mapping->host))) {
> +			printk(KERN_ERR "PSCSI: Unable to locate struct"
> +				" block_device from I_BDEV()\n");
> +			iput(inode);
> +			fput(filp);
> +			return(ERR_PTR(-EINVAL));
> +		}
> +		if (!(gd = bd->bd_disk)) {
> +			printk(KERN_ERR "PSCSI: Unable to locate struct gendisk"
> +				" from struct block_device\n");
> +			iput(inode);
> +			fput(filp);
> +			return(ERR_PTR(-EINVAL));
> +		}
> +		/*
> +		 * This struct gendisk->driver_fs() is marked as "// remove'
> +		 * in include/linux/genhd.h..
> +		 *
> +		 * Currently in drivers/scsi/s[d,r].c:s[d,r]_probe(), this
> +		 * pointer gets set by struct scsi_device->sdev_gendev.
> +		 *
> +		 * Is there a better way to locate struct scsi_device from
> +		 * struct inode..?
> +		 */
> +		if (!(gd->driverfs_dev)) {
> +			printk(KERN_ERR "PSCSI: struct gendisk->driverfs_dev"
> +					" is NULL!\n");
> +			iput(inode);
> +			fput(filp);
> +			return(ERR_PTR(-EINVAL));
> +		}
> +		if (!(sd = to_scsi_device(gd->driverfs_dev))) {
> +			printk(KERN_ERR "PSCSI: Unable to locate struct scsi_device"
> +				" from struct gendisk->driverfs_dev\n");
> +			iput(inode);
> +			fput(filp);
> +			return(ERR_PTR(-EINVAL));
> +		}
> +		if (sd->host != sh) {
> +			printk(KERN_ERR "PSCSI: Trying to attach scsi_device"
> +				" Host ID: %d, but se_hba_t has SCSI Host ID: %d\n",
> +				sd->host->host_no, sh->host_no);
> +			iput(inode);
> +			fput(filp);
> +			return(ERR_PTR(-EINVAL));
> +		}
> +		/*
> +		 * pscsi_create_type_[disk,rom]() will release host_lock..
> +		 */
> +		spin_lock_irq(sh->host_lock);
> +		switch (sd->type) {
> +		case TYPE_DISK:
> +			dev = pscsi_create_type_disk(sd, pdv, se_dev->se_dev_hba);
> +			break;
> +		case TYPE_ROM:
> +			dev = pscsi_create_type_rom(sd, pdv, se_dev->se_dev_hba);
> +			break;
> +		default:
> +			printk(KERN_ERR "PSCSI: Unable to handle type S_ISBLK() =="
> +				" TRUE Type: %s\n", scsi_device_type(sd->type));
> +			spin_unlock_irq(sh->host_lock);
> +			iput(inode);
> +			fput(filp);
> +			return(ERR_PTR(-ENOSYS));
> +		}
> +	} else if (S_ISCHR(inode->i_mode)) {
> +#warning FIXME: Figure how to get struct scsi_device from character device's struct inode
> +		printk(KERN_ERR "SCSI Character Device unsupported via"
> +			" configfs/fd  method.  Use configfs/control instead\n");
> +		iput(inode);
> +		fput(filp);
> +		return(ERR_PTR(-ENOSYS));
> +	} else {
> +		printk(KERN_ERR "PSCSI: File destriptor is not SCSI block or character"
> +			" device, ignoring\n");
> +		iput(inode);
> +		fput(filp);
> +		return(ERR_PTR(-ENODEV));
> +	}
> +
> +	iput(inode);
> +	fput(filp);
> +	return(dev);
> +}
> +
>  extern int pscsi_check_dev_params (se_hba_t *hba, struct iscsi_target *t, se_dev_transport_info_t *dti)
>  {
>  	if (!(t->hba_params_set & PARAM_HBA_SCSI_CHANNEL_ID)) {
> diff --git a/drivers/lio-core/target_core_pscsi.h b/drivers/lio-core/target_core_pscsi.h
> index 74d444b..f2883d8 100644
> --- a/drivers/lio-core/target_core_pscsi.h
> +++ b/drivers/lio-core/target_core_pscsi.h
> @@ -75,6 +75,7 @@ extern int pscsi_check_hba_params (se_hbainfo_t *, struct iscsi_target *, int);
>  extern ssize_t pscsi_set_configfs_dev_params (se_hba_t *, se_subsystem_dev_t *, const char *, ssize_t);
>  extern ssize_t pscsi_check_configfs_dev_params (se_hba_t *, se_subsystem_dev_t *);
>  extern ssize_t pscsi_show_configfs_dev_params (se_hba_t *, se_subsystem_dev_t *, char *);
> +extern se_device_t *pscsi_create_virtdevice_from_fd (se_subsystem_dev_t *, const char *);
>  extern int pscsi_check_dev_params (se_hba_t *, struct iscsi_target *, se_dev_transport_info_t *);
>  extern void pscsi_get_plugin_info (void *, char *, int *);
>  extern void pscsi_get_hba_info (se_hba_t *, char *, int *);
> @@ -166,6 +167,7 @@ se_subsystem_spc_t pscsi_template_spc = ISCSI_PSCSI_SPC;
>  	check_configfs_dev_params: pscsi_check_configfs_dev_params, \
>  	set_configfs_dev_params: pscsi_set_configfs_dev_params, \
>  	show_configfs_dev_params: pscsi_show_configfs_dev_params, \
> +	create_virtdevice_from_fd: pscsi_create_virtdevice_from_fd, \
>  	check_dev_params:	pscsi_check_dev_params,		\
>  	get_plugin_info:	pscsi_get_plugin_info,		\
>  	get_hba_info:		pscsi_get_hba_info,		\

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