I have tested this patch on LSI rdac storage. It works pretty well.. > -----Original Message----- > From: linux-scsi-owner@xxxxxxxxxxxxxxx [mailto:linux-scsi- > owner@xxxxxxxxxxxxxxx] On Behalf Of Chandra Seetharaman > Sent: Wednesday, October 21, 2009 11:23 AM > To: linux-scsi@xxxxxxxxxxxxxxx > Cc: dm-devel@xxxxxxxxxx; Moger, Babu; michaelc@xxxxxxxxxxx; > Benoit_Arthur@xxxxxxx; Eddie.Williams@xxxxxxxxxxxx; > berthiaume_wayne@xxxxxxx; Chandra Seetharaman > Subject: [PATCH 1/4] scsi_dh: Change the scsidh_activate interface to > be asynchronous > > Make scsi_dh_activate() function asynchronous, by taking in two > additional > parameters, one is the callback function and the other is the data to > call > the callback function with. > > Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx> Tested-by: Babu Moger@xxxxxxx > > -------------- > drivers/md/dm-mpath.c | 8 ++++---- > drivers/scsi/device_handler/scsi_dh.c | 17 ++++++++++++----- > drivers/scsi/device_handler/scsi_dh_alua.c | 7 +++++-- > drivers/scsi/device_handler/scsi_dh_emc.c | 7 +++++-- > drivers/scsi/device_handler/scsi_dh_hp_sw.c | 7 +++++-- > drivers/scsi/device_handler/scsi_dh_rdac.c | 7 +++++-- > include/scsi/scsi_device.h | 3 ++- > include/scsi/scsi_dh.h | 6 ++++-- > 8 files changed, 42 insertions(+), 20 deletions(-) > > Index: linux-2.6.32-rc5/include/scsi/scsi_dh.h > =================================================================== > --- linux-2.6.32-rc5.orig/include/scsi/scsi_dh.h 2009-10-20 > 18:26:03.000000000 -0700 > +++ linux-2.6.32-rc5/include/scsi/scsi_dh.h 2009-10-20 > 18:26:14.000000000 -0700 > @@ -56,14 +56,16 @@ > SCSI_DH_DRIVER_MAX, > }; > #if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE) > -extern int scsi_dh_activate(struct request_queue *); > +extern int scsi_dh_activate(struct request_queue *, activate_complete, > void *); > extern int scsi_dh_handler_exist(const char *); > extern int scsi_dh_attach(struct request_queue *, const char *); > extern void scsi_dh_detach(struct request_queue *); > extern int scsi_dh_set_params(struct request_queue *, const char *); > #else > -static inline int scsi_dh_activate(struct request_queue *req) > +static inline int scsi_dh_activate(struct request_queue *req, > + activate_complete fn, void *data) > { > + fn(data, 0); > return 0; > } > static inline int scsi_dh_handler_exist(const char *name) > Index: linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh.c > =================================================================== > --- linux-2.6.32-rc5.orig/drivers/scsi/device_handler/scsi_dh.c 2009- > 10-20 18:26:03.000000000 -0700 > +++ linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh.c 2009-10-20 > 18:26:14.000000000 -0700 > @@ -226,7 +226,7 @@ > * Activate a device handler > */ > if (scsi_dh->activate) > - err = scsi_dh->activate(sdev); > + err = scsi_dh->activate(sdev, NULL, NULL); > else > err = 0; > } > @@ -423,10 +423,17 @@ > /* > * scsi_dh_activate - activate the path associated with the > scsi_device > * corresponding to the given request queue. > - * @q - Request queue that is associated with the scsi_device to be > - * activated. > + * Returns immediately without waiting for activation to be > completed. > + * @q - Request queue that is associated with the scsi_device to be > + * activated. > + * @fn - Function to be called upon completion of the activation. > + * Function fn is called with data (below) and the error code. > + * Function fn may be called from the same calling context. > So, > + * do not hold the lock in the caller which may be needed in > fn. > + * @data - data passed to the function fn upon completion. > + * > */ > -int scsi_dh_activate(struct request_queue *q) > +int scsi_dh_activate(struct request_queue *q, activate_complete fn, > void *data) > { > int err = 0; > unsigned long flags; > @@ -445,7 +452,7 @@ > return err; > > if (scsi_dh->activate) > - err = scsi_dh->activate(sdev); > + err = scsi_dh->activate(sdev, fn, data); > put_device(&sdev->sdev_gendev); > return err; > } > Index: linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh_rdac.c > =================================================================== > --- linux-2.6.32-rc5.orig/drivers/scsi/device_handler/scsi_dh_rdac.c > 2009-10-20 18:26:03.000000000 -0700 > +++ linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh_rdac.c 2009- > 10-20 18:26:14.000000000 -0700 > @@ -568,7 +568,8 @@ > return err; > } > > -static int rdac_activate(struct scsi_device *sdev) > +static int rdac_activate(struct scsi_device *sdev, > + activate_complete fn, void *data) > { > struct rdac_dh_data *h = get_rdac_data(sdev); > int err = SCSI_DH_OK; > @@ -580,7 +581,9 @@ > if (h->lun_state == RDAC_LUN_UNOWNED) > err = send_mode_select(sdev, h); > done: > - return err; > + if (fn) > + fn(data, err); > + return 0; > } > > static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) > Index: linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh_alua.c > =================================================================== > --- linux-2.6.32-rc5.orig/drivers/scsi/device_handler/scsi_dh_alua.c > 2009-10-20 18:26:03.000000000 -0700 > +++ linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh_alua.c 2009- > 10-20 18:26:14.000000000 -0700 > @@ -652,7 +652,8 @@ > * based on a certain policy. But until we actually encounter them it > * should be okay. > */ > -static int alua_activate(struct scsi_device *sdev) > +static int alua_activate(struct scsi_device *sdev, > + activate_complete fn, void *data) > { > struct alua_dh_data *h = get_alua_data(sdev); > int err = SCSI_DH_OK; > @@ -667,7 +668,9 @@ > err = alua_stpg(sdev, TPGS_STATE_OPTIMIZED, h); > > out: > - return err; > + if (fn) > + fn(data, err); > + return 0; > } > > /* > Index: linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh_emc.c > =================================================================== > --- linux-2.6.32-rc5.orig/drivers/scsi/device_handler/scsi_dh_emc.c > 2009-10-20 18:26:03.000000000 -0700 > +++ linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh_emc.c 2009- > 10-20 18:26:14.000000000 -0700 > @@ -528,7 +528,8 @@ > return err; > } > > -static int clariion_activate(struct scsi_device *sdev) > +static int clariion_activate(struct scsi_device *sdev, > + activate_complete fn, void *data) > { > struct clariion_dh_data *csdev = get_clariion_data(sdev); > int result; > @@ -559,7 +560,9 @@ > csdev->port, lun_state[csdev->lun_state], > csdev->default_sp + 'A'); > > - return result; > + if (fn) > + fn(data, result); > + return 0; > } > /* > * params - parameters in the following format > Index: linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh_hp_sw.c > =================================================================== > --- linux-2.6.32-rc5.orig/drivers/scsi/device_handler/scsi_dh_hp_sw.c > 2009-10-20 18:26:03.000000000 -0700 > +++ linux-2.6.32-rc5/drivers/scsi/device_handler/scsi_dh_hp_sw.c 2009- > 10-20 18:26:14.000000000 -0700 > @@ -268,7 +268,8 @@ > * activate the passive path (and deactivate the > * previously active one). > */ > -static int hp_sw_activate(struct scsi_device *sdev) > +static int hp_sw_activate(struct scsi_device *sdev, > + activate_complete fn, void *data) > { > int ret = SCSI_DH_OK; > struct hp_sw_dh_data *h = get_hp_sw_data(sdev); > @@ -283,7 +284,9 @@ > HP_SW_NAME); > } > > - return ret; > + if (fn) > + fn(data, ret); > + return 0; > } > > static const struct scsi_dh_devlist hp_sw_dh_data_list[] = { > Index: linux-2.6.32-rc5/include/scsi/scsi_device.h > =================================================================== > --- linux-2.6.32-rc5.orig/include/scsi/scsi_device.h 2009-10-20 > 18:26:03.000000000 -0700 > +++ linux-2.6.32-rc5/include/scsi/scsi_device.h 2009-10-20 > 18:26:14.000000000 -0700 > @@ -174,6 +174,7 @@ > char *model; > }; > > +typedef void (*activate_complete)(void *, int); > struct scsi_device_handler { > /* Used by the infrastructure */ > struct list_head list; /* list of scsi_device_handlers */ > @@ -185,7 +186,7 @@ > int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr > *); > int (*attach)(struct scsi_device *); > void (*detach)(struct scsi_device *); > - int (*activate)(struct scsi_device *); > + int (*activate)(struct scsi_device *, activate_complete, void *); > int (*prep_fn)(struct scsi_device *, struct request *); > int (*set_params)(struct scsi_device *, const char *); > }; > Index: linux-2.6.32-rc5/drivers/md/dm-mpath.c > =================================================================== > --- linux-2.6.32-rc5.orig/drivers/md/dm-mpath.c 2009-10-20 > 18:26:03.000000000 -0700 > +++ linux-2.6.32-rc5/drivers/md/dm-mpath.c 2009-10-20 > 18:26:14.000000000 -0700 > @@ -1116,8 +1116,9 @@ > return limit_reached; > } > > -static void pg_init_done(struct dm_path *path, int errors) > +static void pg_init_done(void *data, int errors) > { > + struct dm_path *path = data; > struct pgpath *pgpath = path_to_pgpath(path); > struct priority_group *pg = pgpath->pg; > struct multipath *m = pg->m; > @@ -1183,12 +1184,11 @@ > > static void activate_path(struct work_struct *work) > { > - int ret; > struct pgpath *pgpath = > container_of(work, struct pgpath, activate_path); > > - ret = scsi_dh_activate(bdev_get_queue(pgpath->path.dev->bdev)); > - pg_init_done(&pgpath->path, ret); > + scsi_dh_activate(bdev_get_queue(pgpath->path.dev->bdev), > + pg_init_done, &pgpath->path); > } > > /* > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" > in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
