From 14d9cb5f760c86b3a8f686909465982231c06627 Mon Sep 17 00:00:00 2001 From: Chandra Seetharaman Date: Mon, 3 Aug 2009 12:42:39 -0700 Subject: [PATCH] [SCSI] scsi_dh: Provide set_params interface in emc device handler Handle the parameters provided by user thru multipath. This handler expects only 2 parameters and their value can either be 0 or 1. This code originates from the old dm-emc.c file. Appropriate changes have been made to make it work in the new design. Reported-by: Eddie Williams Signed-off-by: Chandra Seetharaman Tested-by: Eddie Williams Signed-off-by: James Bottomley Signed-off-by: James Bottomley --- drivers/scsi/device_handler/scsi_dh_emc.c | 59 +++++++++++++++++++++++++++++-- 1 file changed, 56 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c index 0e572d2..0cffe84 100644 --- a/drivers/scsi/device_handler/scsi_dh_emc.c +++ b/drivers/scsi/device_handler/scsi_dh_emc.c @@ -561,6 +561,61 @@ done: return result; } +/* + * params - parameters in the following format + * "no_of_params\0param1\0param2\0param3\0...\0" + * for example, string for 2 parameters with value 10 and 21 + * is specified as "2\010\021\0". + */ +static int clariion_set_params(struct scsi_device *sdev, const char *params) +{ + struct clariion_dh_data *csdev = get_clariion_data(sdev); + unsigned int hr = 0, st = 0, argc; + const char *p = params; + int result = SCSI_DH_OK; + + if ((sscanf(params, "%u", &argc) != 1) || (argc != 2)) + return -EINVAL; + + while (*p++) + ; + if ((sscanf(p, "%u", &st) != 1) || (st > 1)) + return -EINVAL; + + while (*p++) + ; + if ((sscanf(p, "%u", &hr) != 1) || (hr > 1)) + return -EINVAL; + + if (st) + csdev->flags |= CLARIION_SHORT_TRESPASS; + else + csdev->flags &= ~CLARIION_SHORT_TRESPASS; + + if (hr) + csdev->flags |= CLARIION_HONOR_RESERVATIONS; + else + csdev->flags &= ~CLARIION_HONOR_RESERVATIONS; + + /* + * If this path is owned, we have to send a trespass command + * with the new parameters. If not, simply return. Next trespass + * command would use the parameters. + */ + if (csdev->lun_state != CLARIION_LUN_OWNED) + goto done; + + csdev->lun_state = CLARIION_LUN_UNINITIALIZED; + result = send_trespass_cmd(sdev, csdev); + if (result != SCSI_DH_OK) + goto done; + + /* Update status */ + result = clariion_send_inquiry(sdev, csdev); + +done: + return result; +} static const struct scsi_dh_devlist clariion_dev_list[] = { {"DGC", "RAID"}, @@ -581,11 +636,9 @@ static struct scsi_device_handler clariion_dh = { .check_sense = clariion_check_sense, .activate = clariion_activate, .prep_fn = clariion_prep_fn, + .set_params = clariion_set_params, }; -/* - * TODO: need some interface so we can set trespass values - */ static int clariion_bus_attach(struct scsi_device *sdev) { struct scsi_dh_data *scsi_dh_data; -- 2.7.4