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086b91d052
Stop building scsi_dh as a separate module and integrate it fully into the core SCSI code with explicit callouts at bus scan time. For now the callouts are placed at the same point as the old bus notifiers were called, but in the future we will be able to look at ALUA INQUIRY data earlier on. Note that this also means that the device handler modules need to be loaded by the time we scan the bus. The next patches will add support for autoloading device handlers at bus scan time to make sure they are always loaded if they are enabled in the kernel config. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
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* Header file for SCSI device handler infrastruture.
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*
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* Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright IBM Corporation, 2007
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* Authors:
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* Chandra Seetharaman <sekharan@us.ibm.com>
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* Mike Anderson <andmike@linux.vnet.ibm.com>
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*/
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#include <scsi/scsi_device.h>
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enum {
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SCSI_DH_OK = 0,
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/*
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* device errors
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*/
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SCSI_DH_DEV_FAILED, /* generic device error */
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SCSI_DH_DEV_TEMP_BUSY,
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SCSI_DH_DEV_UNSUPP, /* device handler not supported */
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SCSI_DH_DEVICE_MAX, /* max device blkerr definition */
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/*
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* transport errors
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*/
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SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,
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SCSI_DH_CONN_FAILURE,
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SCSI_DH_TRANSPORT_MAX, /* max transport blkerr definition */
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/*
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* driver and generic errors
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*/
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SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */
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SCSI_DH_INVALID_IO,
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SCSI_DH_RETRY, /* retry the req, but not immediately */
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SCSI_DH_IMM_RETRY, /* immediately retry the req */
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SCSI_DH_TIMED_OUT,
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SCSI_DH_RES_TEMP_UNAVAIL,
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SCSI_DH_DEV_OFFLINED,
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SCSI_DH_NOSYS,
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SCSI_DH_DRIVER_MAX,
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};
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#ifdef CONFIG_SCSI_DH
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extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);
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extern int scsi_dh_attach(struct request_queue *, const char *);
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extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);
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extern int scsi_dh_set_params(struct request_queue *, const char *);
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#else
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static inline int scsi_dh_activate(struct request_queue *req,
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activate_complete fn, void *data)
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{
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fn(data, 0);
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return 0;
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}
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static inline int scsi_dh_attach(struct request_queue *req, const char *name)
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{
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return SCSI_DH_NOSYS;
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}
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static inline const char *scsi_dh_attached_handler_name(struct request_queue *q,
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gfp_t gfp)
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{
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return NULL;
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}
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static inline int scsi_dh_set_params(struct request_queue *req, const char *params)
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{
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return -SCSI_DH_NOSYS;
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}
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#endif
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