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target: Implement Block Device Characteristics VPD page 

Implement page B1h, Block Device Characteristics, so that we can report
a medium rotation rate of 1 (non-rotating / solid state) if the
is_nonrot device attribute is set; we update the iblock backend to set
this attribute if the underlying Linux block device has its nonrot
flag set.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Roland Dreier 2011-07-05 13:34:52 -07:00 committed by Nicholas Bellinger
parent b2eb705e00
commit e22a7f0752
7 changed files with 41 additions and 0 deletions
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17
drivers/target/target_core_cdb.c
View File

@ -535,6 +535,22 @@ target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
return 0;
}
/* Block Device Characteristics VPD page */
static int
target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
buf[0] = dev->transport->get_device_type(dev);
buf[3] = 0x3c;
if (cmd->data_length >= 5 &&
dev->se_sub_dev->se_dev_attrib.is_nonrot)
buf[5] = 1;
return 0;
}
/* Thin Provisioning VPD */
static int
target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
@ -599,6 +615,7 @@ static struct {
{ .page = 0x83, .emulate = target_emulate_evpd_83 },
{ .page = 0x86, .emulate = target_emulate_evpd_86 },
{ .page = 0xb0, .emulate = target_emulate_evpd_b0 },
{ .page = 0xb1, .emulate = target_emulate_evpd_b1 },
{ .page = 0xb2, .emulate = target_emulate_evpd_b2 },
};

4
drivers/target/target_core_configfs.c
View File

@ -698,6 +698,9 @@ SE_DEV_ATTR(emulate_tpws, S_IRUGO | S_IWUSR);
DEF_DEV_ATTRIB(enforce_pr_isids);
SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
DEF_DEV_ATTRIB(is_nonrot);
SE_DEV_ATTR(is_nonrot, S_IRUGO | S_IWUSR);
DEF_DEV_ATTRIB_RO(hw_block_size);
SE_DEV_ATTR_RO(hw_block_size);
@ -746,6 +749,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
&target_core_dev_attrib_emulate_tpu.attr,
&target_core_dev_attrib_emulate_tpws.attr,
&target_core_dev_attrib_enforce_pr_isids.attr,
&target_core_dev_attrib_is_nonrot.attr,
&target_core_dev_attrib_hw_block_size.attr,
&target_core_dev_attrib_block_size.attr,
&target_core_dev_attrib_hw_max_sectors.attr,

13
drivers/target/target_core_device.c
View File

@ -853,6 +853,7 @@ void se_dev_set_default_attribs(
dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
/*
* The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
* iblock_create_virtdevice() from struct queue_limits values
@ -1117,6 +1118,18 @@ int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
return 0;
}
int se_dev_set_is_nonrot(struct se_device *dev, int flag)
{
if ((flag != 0) && (flag != 1)) {
printk(KERN_ERR "Illegal value %d\n", flag);
return -EINVAL;
}
dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
printk(KERN_INFO "dev[%p]: SE Device is_nonrot bit: %d\n",
dev, flag);
return 0;
}
/*
* Note, this can only be called on unexported SE Device Object.
*/

3
drivers/target/target_core_iblock.c
View File

@ -196,6 +196,9 @@ static struct se_device *iblock_create_virtdevice(
" disabled by default\n");
}
if (blk_queue_nonrot(q))
dev->se_sub_dev->se_dev_attrib.is_nonrot = 1;
return dev;
failed:

1
include/target/target_core_base.h
View File

@ -661,6 +661,7 @@ struct se_dev_attrib {
int emulate_reservations;
int emulate_alua;
int enforce_pr_isids;
int is_nonrot;
u32 hw_block_size;
u32 block_size;
u32 hw_max_sectors;

1
include/target/target_core_device.h
View File

@ -39,6 +39,7 @@ extern int se_dev_set_emulate_tas(struct se_device *, int);
extern int se_dev_set_emulate_tpu(struct se_device *, int);
extern int se_dev_set_emulate_tpws(struct se_device *, int);
extern int se_dev_set_enforce_pr_isids(struct se_device *, int);
extern int se_dev_set_is_nonrot(struct se_device *, int);
extern int se_dev_set_queue_depth(struct se_device *, u32);
extern int se_dev_set_max_sectors(struct se_device *, u32);
extern int se_dev_set_optimal_sectors(struct se_device *, u32);

2
include/target/target_core_transport.h
View File

@ -101,6 +101,8 @@
#define DA_ENFORCE_PR_ISIDS 1
#define DA_STATUS_MAX_SECTORS_MIN 16
#define DA_STATUS_MAX_SECTORS_MAX 8192
/* By default don't report non-rotating (solid state) medium */
#define DA_IS_NONROT 0
#define SE_MODE_PAGE_BUF 512