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scsi: target: tcmu: Make data_pages_per_blk changeable via configfs

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Make data_pages_per_blk changeable similar to the way it is done for
max_data_area_mb. One can change the value by typing:

  echo "data_pages_per_blk=N" >control

The value is printed when doing:

  cat info

In addition, a new readonly attribute 'data_pages_per_blk' returns the
value on read.

Link: https://lore.kernel.org/r/20210324195758.2021-7-bostroesser@gmail.com
Signed-off-by: Bodo Stroesser <bostroesser@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bodo Stroesser 2021-03-24 20:57:58 +01:00 committed by Martin K. Petersen
parent e719afdcf6
commit 08976cb548
1 changed files with 53 additions and 2 deletions
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55
drivers/target/target_core_user.c
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@ -2331,7 +2331,8 @@ static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level)
enum {
Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors,
Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err,
Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_data_pages_per_blk,
Opt_err,
};
static match_table_t tokens = {
@ -2341,6 +2342,7 @@ static match_table_t tokens = {
{Opt_hw_max_sectors, "hw_max_sectors=%d"},
{Opt_nl_reply_supported, "nl_reply_supported=%d"},
{Opt_max_data_area_mb, "max_data_area_mb=%d"},
{Opt_data_pages_per_blk, "data_pages_per_blk=%d"},
{Opt_err, NULL}
};
@ -2405,6 +2407,39 @@ unlock:
return ret;
}
static int tcmu_set_data_pages_per_blk(struct tcmu_dev *udev, substring_t *arg)
{
int val, ret;
ret = match_int(arg, &val);
if (ret < 0) {
pr_err("match_int() failed for data_pages_per_blk=. Error %d.\n",
ret);
return ret;
}
if (val > TCMU_MBS_TO_PAGES(udev->data_area_mb)) {
pr_err("Invalid data_pages_per_blk %d: greater than max_data_area_mb %d -> %zd pages).\n",
val, udev->data_area_mb,
TCMU_MBS_TO_PAGES(udev->data_area_mb));
return -EINVAL;
}
mutex_lock(&udev->cmdr_lock);
if (udev->data_bitmap) {
pr_err("Cannot set data_pages_per_blk after it has been enabled.\n");
ret = -EINVAL;
goto unlock;
}
udev->data_pages_per_blk = val;
udev->max_blocks = TCMU_MBS_TO_PAGES(udev->data_area_mb) / val;
unlock:
mutex_unlock(&udev->cmdr_lock);
return ret;
}
static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
const char *page, ssize_t count)
{
@ -2456,6 +2491,9 @@ static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
case Opt_max_data_area_mb:
ret = tcmu_set_max_blocks_param(udev, &args[0]);
break;
case Opt_data_pages_per_blk:
ret = tcmu_set_data_pages_per_blk(udev, &args[0]);
break;
default:
break;
}
@ -2476,7 +2514,8 @@ static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b)
bl = sprintf(b + bl, "Config: %s ",
udev->dev_config[0] ? udev->dev_config : "NULL");
bl += sprintf(b + bl, "Size: %llu ", udev->dev_size);
bl += sprintf(b + bl, "MaxDataAreaMB: %u\n", udev->data_area_mb);
bl += sprintf(b + bl, "MaxDataAreaMB: %u ", udev->data_area_mb);
bl += sprintf(b + bl, "DataPagesPerBlk: %u\n", udev->data_pages_per_blk);
return bl;
}
@ -2574,6 +2613,17 @@ static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page)
}
CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb);
static ssize_t tcmu_data_pages_per_blk_show(struct config_item *item,
char *page)
{
struct se_dev_attrib *da = container_of(to_config_group(item),
struct se_dev_attrib, da_group);
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
return snprintf(page, PAGE_SIZE, "%u\n", udev->data_pages_per_blk);
}
CONFIGFS_ATTR_RO(tcmu_, data_pages_per_blk);
static ssize_t tcmu_dev_config_show(struct config_item *item, char *page)
{
struct se_dev_attrib *da = container_of(to_config_group(item),
@ -2885,6 +2935,7 @@ static struct configfs_attribute *tcmu_attrib_attrs[] = {
&tcmu_attr_cmd_time_out,
&tcmu_attr_qfull_time_out,
&tcmu_attr_max_data_area_mb,
&tcmu_attr_data_pages_per_blk,
&tcmu_attr_dev_config,
&tcmu_attr_dev_size,
&tcmu_attr_emulate_write_cache,