SCSI: Disable WRITE SAME for RAID and virtual host adapter drivers

commit 54b2b50c20a61b51199bedb6e5d2f8ec2568fb43 upstream.

Some host adapters do not pass commands through to the target disk
directly. Instead they provide an emulated target which may or may not
accurately report its capabilities. In some cases the physical device
characteristics are reported even when the host adapter is processing
commands on the device's behalf. This can lead to adapter firmware hangs
or excessive I/O errors.

This patch disables WRITE SAME for devices connected to host adapters
that provide an emulated target. Driver writers can disable WRITE SAME
by setting the no_write_same flag in the host adapter template.

[jejb: fix up rejections due to eh_deadline patch]
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 0101af5..4abdbdf 100644 (file)
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3614,6 +3614,7 @@ int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
                shost->max_lun = 1;
                shost->max_channel = 1;
                shost->max_cmd_len = 16;
+               shost->no_write_same = 1;
 
                /* Schedule policy is determined by ->qc_defer()
                 * callback and it needs to see every deferred qc.

diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index 47674b9..c8e3b2c 100644 (file)
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -1626,6 +1626,7 @@ static struct scsi_host_template scsi_driver_template = {
        .cmd_per_lun            = 1,
        .can_queue              = 1,
        .sdev_attrs             = sbp2_scsi_sysfs_attrs,
+       .no_write_same          = 1,
 };
 
 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");

diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index 5e1e12c..0a73253 100644 (file)
--- a/drivers/scsi/3w-9xxx.c
+++ b/drivers/scsi/3w-9xxx.c
@@ -2025,7 +2025,8 @@ static struct scsi_host_template driver_template = {
        .cmd_per_lun            = TW_MAX_CMDS_PER_LUN,
        .use_clustering         = ENABLE_CLUSTERING,
        .shost_attrs            = twa_host_attrs,
-       .emulated               = 1
+       .emulated               = 1,
+       .no_write_same          = 1,
 };
 
 /* This function will probe and initialize a card */

diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c
index c845bdb..4de3460 100644 (file)
--- a/drivers/scsi/3w-sas.c
+++ b/drivers/scsi/3w-sas.c
@@ -1600,7 +1600,8 @@ static struct scsi_host_template driver_template = {
        .cmd_per_lun            = TW_MAX_CMDS_PER_LUN,
        .use_clustering         = ENABLE_CLUSTERING,
        .shost_attrs            = twl_host_attrs,
-       .emulated               = 1
+       .emulated               = 1,
+       .no_write_same          = 1,
 };
 
 /* This function will probe and initialize a card */

diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
index 56662ae..430ee37 100644 (file)
--- a/drivers/scsi/3w-xxxx.c
+++ b/drivers/scsi/3w-xxxx.c
@@ -2277,7 +2277,8 @@ static struct scsi_host_template driver_template = {
        .cmd_per_lun            = TW_MAX_CMDS_PER_LUN,  
        .use_clustering         = ENABLE_CLUSTERING,
        .shost_attrs            = tw_host_attrs,
-       .emulated               = 1
+       .emulated               = 1,
+       .no_write_same          = 1,
 };
 
 /* This function will probe and initialize a card */

diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index f0d432c..4921ed1 100644 (file)
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -1081,6 +1081,7 @@ static struct scsi_host_template aac_driver_template = {
 #endif
        .use_clustering                 = ENABLE_CLUSTERING,
        .emulated                       = 1,
+       .no_write_same                  = 1,
 };
 
 static void __aac_shutdown(struct aac_dev * aac)

diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index 33c52bc..278c9fa 100644 (file)
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -137,6 +137,7 @@ static struct scsi_host_template arcmsr_scsi_host_template = {
        .cmd_per_lun            = ARCMSR_MAX_CMD_PERLUN,
        .use_clustering         = ENABLE_CLUSTERING,
        .shost_attrs            = arcmsr_host_attrs,
+       .no_write_same          = 1,
 };
 static struct pci_device_id arcmsr_device_id_table[] = {
        {PCI_DEVICE(PCI_VENDOR_ID_ARECA, PCI_DEVICE_ID_ARECA_1110)},

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 6d55b4e..aec3d4d 100644 (file)
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -4686,6 +4686,7 @@ static struct scsi_host_template gdth_template = {
         .cmd_per_lun            = GDTH_MAXC_P_L,
         .unchecked_isa_dma      = 1,
         .use_clustering         = ENABLE_CLUSTERING,
+       .no_write_same          = 1,
 };
 
 #ifdef CONFIG_ISA

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index df0c3c7..3cafe0d 100644 (file)
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -388,6 +388,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
        shost->unchecked_isa_dma = sht->unchecked_isa_dma;
        shost->use_clustering = sht->use_clustering;
        shost->ordered_tag = sht->ordered_tag;
+       shost->no_write_same = sht->no_write_same;
 
        if (sht->supported_mode == MODE_UNKNOWN)
                /* means we didn't set it ... default to INITIATOR */

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 8e292aa..0353d7f 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -538,6 +538,7 @@ static struct scsi_host_template hpsa_driver_template = {
        .sdev_attrs = hpsa_sdev_attrs,
        .shost_attrs = hpsa_shost_attrs,
        .max_sectors = 8192,
+       .no_write_same = 1,
 };
 
 

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 6c4cedb..0ff37a5 100644 (file)
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -6267,7 +6267,8 @@ static struct scsi_host_template driver_template = {
        .use_clustering = ENABLE_CLUSTERING,
        .shost_attrs = ipr_ioa_attrs,
        .sdev_attrs = ipr_dev_attrs,
-       .proc_name = IPR_NAME
+       .proc_name = IPR_NAME,
+       .no_write_same = 1,
 };
 
 /**

diff --git a/drivers/scsi/ips.c b/drivers/scsi/ips.c
index 8d5ea8a..52a216f 100644 (file)
--- a/drivers/scsi/ips.c
+++ b/drivers/scsi/ips.c
@@ -374,6 +374,7 @@ static struct scsi_host_template ips_driver_template = {
        .sg_tablesize           = IPS_MAX_SG,
        .cmd_per_lun            = 3,
        .use_clustering         = ENABLE_CLUSTERING,
+       .no_write_same          = 1,
 };
 
 

diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index 846f475..60cf7b1 100644 (file)
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -4244,6 +4244,7 @@ static struct scsi_host_template megaraid_template = {
        .eh_device_reset_handler        = megaraid_reset,
        .eh_bus_reset_handler           = megaraid_reset,
        .eh_host_reset_handler          = megaraid_reset,
+       .no_write_same                  = 1,
 };
 
 static int

diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index e6a1e0b..3316d80 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -367,6 +367,7 @@ static struct scsi_host_template megaraid_template_g = {
        .eh_host_reset_handler          = megaraid_reset_handler,
        .change_queue_depth             = megaraid_change_queue_depth,
        .use_clustering                 = ENABLE_CLUSTERING,
+       .no_write_same                  = 1,
        .sdev_attrs                     = megaraid_sdev_attrs,
        .shost_attrs                    = megaraid_shost_attrs,
 };

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 9b60dc1..b3e5c17 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -2099,6 +2099,7 @@ static struct scsi_host_template megasas_template = {
        .bios_param = megasas_bios_param,
        .use_clustering = ENABLE_CLUSTERING,
        .change_queue_depth = megasas_change_queue_depth,
+       .no_write_same = 1,
 };
 
 /**

diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index 8e1b737..bfb72ec 100644 (file)
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -4314,6 +4314,7 @@ static struct scsi_host_template pmcraid_host_template = {
        .this_id = -1,
        .sg_tablesize = PMCRAID_MAX_IOADLS,
        .max_sectors = PMCRAID_IOA_MAX_SECTORS,
+       .no_write_same = 1,
        .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
        .use_clustering = ENABLE_CLUSTERING,
        .shost_attrs = pmcraid_host_attrs,

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 734a29a..9bc913b 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2627,6 +2627,12 @@ static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
 {
        struct scsi_device *sdev = sdkp->device;
 
+       if (sdev->host->no_write_same) {
+               sdev->no_write_same = 1;
+
+               return;
+       }
+
        if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
                sdev->no_report_opcodes = 1;
 

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 16a3a0c..fb7437d 100644 (file)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1454,6 +1454,7 @@ static struct scsi_host_template scsi_driver = {
        .use_clustering =       DISABLE_CLUSTERING,
        /* Make sure we dont get a sg segment crosses a page boundary */
        .dma_boundary =         PAGE_SIZE-1,
+       .no_write_same =        1,
 };
 
 enum {

diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 7552435..50769a7 100644 (file)
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -475,6 +475,9 @@ struct scsi_host_template {
         */
        unsigned ordered_tag:1;
 
+       /* True if the controller does not support WRITE SAME */
+       unsigned no_write_same:1;
+
        /*
         * Countdown for host blocking with no commands outstanding.
         */
@@ -674,6 +677,9 @@ struct Scsi_Host {
        /* Don't resume host in EH */
        unsigned eh_noresume:1;
 
+       /* The controller does not support WRITE SAME */
+       unsigned no_write_same:1;
+
        /*
         * Optional work queue to be utilized by the transport
         */