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scst_vdisk: Make the 'async' attribute modifiable

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Make it possible to change the 'async' attribute after a virtual disk
device has been created.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@7962 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2019-02-18 22:20:58 +00:00
parent 589dad3997
commit 5dfaf65dfc
1 changed files with 25 additions and 1 deletions
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26
scst/src/dev_handlers/scst_vdisk.c
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@@ -511,6 +511,8 @@ static ssize_t vdev_sysfs_inq_vend_specific_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf);
static ssize_t vdev_zero_copy_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf);
static ssize_t vdev_async_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count);
static ssize_t vdev_async_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf);
static ssize_t vdev_dif_filename_show(struct kobject *kobj,
@@ -612,7 +614,7 @@ static struct kobj_attribute vdev_inq_vend_specific_attr =
static struct kobj_attribute vdev_zero_copy_attr =
__ATTR(zero_copy, S_IRUGO, vdev_zero_copy_show, NULL);
static struct kobj_attribute vdev_async_attr =
__ATTR(async, S_IRUGO, vdev_async_show, NULL);
__ATTR(async, S_IWUSR|S_IRUGO, vdev_async_show, vdev_async_store);
static struct kobj_attribute vdev_dif_filename_attr =
__ATTR(dif_filename, S_IRUGO, vdev_dif_filename_show, NULL);
@@ -10441,6 +10443,28 @@ static ssize_t vdev_zero_copy_show(struct kobject *kobj,
return pos;
}
static ssize_t vdev_async_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
struct scst_device *dev =
container_of(kobj, struct scst_device, dev_kobj);
struct scst_vdisk_dev *virt_dev = dev->dh_priv;
long val;
int res;
res = kstrtol(buf, 0, &val);
if (res)
return res;
if (val != !!val)
return -EINVAL;
spin_lock(&virt_dev->flags_lock);
virt_dev->async = val;
spin_unlock(&virt_dev->flags_lock);
return count;
}
static ssize_t vdev_async_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{