[PATCH v2 2/4] blk-integrity: convert to struct device_attribute

Thomas Weißschuh
2023-03-10T22:40:56Z

An upcoming patch will register the integrity attributes directly with
the struct device kobject.
For this the attributes have to be implemented in terms of
struct device_attribute.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
block/blk-integrity.c | 117 +++++++++++++++++++++++---------------------------
1 file changed, 54 insertions(+), 63 deletions(-)

diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index 5dd820ee4d1c..e1c3e3591c82 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -212,21 +212,15 @@ bool blk_integrity_merge_bio(struct request_queue *q, struct request *req,
return true;
}

-struct integrity_sysfs_entry {
- struct attribute attr;
- ssize_t (*show)(struct blk_integrity *, char *);
- ssize_t (*store)(struct blk_integrity *, const char *, size_t);
-};
-
static ssize_t integrity_attr_show(struct kobject *kobj, struct attribute *attr,
char *page)
{
struct gendisk *disk = container_of(kobj, struct gendisk, integrity_kobj);
- struct blk_integrity *bi = &disk->queue->integrity;
- struct integrity_sysfs_entry *entry =
- container_of(attr, struct integrity_sysfs_entry, attr);
+ struct device *dev = disk_to_dev(disk);
+ struct device_attribute *dev_attr =
+ container_of(attr, struct device_attribute, attr);

- return entry->show(bi, page);
+ return dev_attr->show(dev, dev_attr, page);
}

static ssize_t integrity_attr_store(struct kobject *kobj,
@@ -234,39 +228,52 @@ static ssize_t integrity_attr_store(struct kobject *kobj,
size_t count)
{
struct gendisk *disk = container_of(kobj, struct gendisk, integrity_kobj);
- struct blk_integrity *bi = &disk->queue->integrity;
- struct integrity_sysfs_entry *entry =
- container_of(attr, struct integrity_sysfs_entry, attr);
+ struct device *dev = disk_to_dev(disk);
+ struct device_attribute *dev_attr =
+ container_of(attr, struct device_attribute, attr);
ssize_t ret = 0;

- if (entry->store)
- ret = entry->store(bi, page, count);
+ if (dev_attr->store)
+ ret = dev_attr->store(dev, dev_attr, page, count);

return ret;
}

-static ssize_t integrity_format_show(struct blk_integrity *bi, char *page)
+static inline struct blk_integrity *dev_to_bi(struct device *dev)
+{
+ return &dev_to_disk(dev)->queue->integrity;
+}
+
+static ssize_t format_show(struct device *dev, struct device_attribute *attr, char *page)
{
+ struct blk_integrity *bi = dev_to_bi(dev);
+
if (bi->profile && bi->profile->name)
return sysfs_emit(page, "%s\n", bi->profile->name);
else
return sysfs_emit(page, "none\n");
}

-static ssize_t integrity_tag_size_show(struct blk_integrity *bi, char *page)
+static ssize_t tag_size_show(struct device *dev, struct device_attribute *attr, char *page)
{
+ struct blk_integrity *bi = dev_to_bi(dev);
+
return sysfs_emit(page, "%u\n", bi->tag_size);
}

-static ssize_t integrity_interval_show(struct blk_integrity *bi, char *page)
+static ssize_t protection_interval_bytes_show(struct device *dev,
+ struct device_attribute *attr, char *page)
{
+ struct blk_integrity *bi = dev_to_bi(dev);
+
return sysfs_emit(page, "%u\n",
bi->interval_exp ? 1 << bi->interval_exp : 0);
}

-static ssize_t integrity_verify_store(struct blk_integrity *bi,
- const char *page, size_t count)
+static ssize_t read_verify_store(struct device *dev, struct device_attribute *attr,
+ const char *page, size_t count)
{
+ struct blk_integrity *bi = dev_to_bi(dev);
char *p = (char *) page;
unsigned long val = simple_strtoul(p, &p, 10);

@@ -278,14 +285,18 @@ static ssize_t integrity_verify_store(struct blk_integrity *bi,
return count;
}

-static ssize_t integrity_verify_show(struct blk_integrity *bi, char *page)
+static ssize_t read_verify_show(struct device *dev, struct device_attribute *attr, char *page)
{
+ struct blk_integrity *bi = dev_to_bi(dev);
+
return sysfs_emit(page, "%d\n", (bi->flags & BLK_INTEGRITY_VERIFY) != 0);
}

-static ssize_t integrity_generate_store(struct blk_integrity *bi,
- const char *page, size_t count)
+static ssize_t write_generate_store(struct device *dev, struct device_attribute *attr,
+ const char *page, size_t count)
{
+ struct blk_integrity *bi = dev_to_bi(dev);
+
char *p = (char *) page;
unsigned long val = simple_strtoul(p, &p, 10);

@@ -297,57 +308,37 @@ static ssize_t integrity_generate_store(struct blk_integrity *bi,
return count;
}

-static ssize_t integrity_generate_show(struct blk_integrity *bi, char *page)
+static ssize_t write_generate_show(struct device *dev, struct device_attribute *attr, char *page)
{
+ struct blk_integrity *bi = dev_to_bi(dev);
+
return sysfs_emit(page, "%d\n", (bi->flags & BLK_INTEGRITY_GENERATE) != 0);
}

-static ssize_t integrity_device_show(struct blk_integrity *bi, char *page)
+static ssize_t device_is_integrity_capable_show(struct device *dev,
+ struct device_attribute *attr, char *page)
{
+ struct blk_integrity *bi = dev_to_bi(dev);
+
return sysfs_emit(page, "%u\n",
(bi->flags & BLK_INTEGRITY_DEVICE_CAPABLE) != 0);
}

-static struct integrity_sysfs_entry integrity_format_entry = {
- .attr = { .name = "format", .mode = 0444 },
- .show = integrity_format_show,
-};
-
-static struct integrity_sysfs_entry integrity_tag_size_entry = {
- .attr = { .name = "tag_size", .mode = 0444 },
- .show = integrity_tag_size_show,
-};
-
-static struct integrity_sysfs_entry integrity_interval_entry = {
- .attr = { .name = "protection_interval_bytes", .mode = 0444 },
- .show = integrity_interval_show,
-};
-
-static struct integrity_sysfs_entry integrity_verify_entry = {
- .attr = { .name = "read_verify", .mode = 0644 },
- .show = integrity_verify_show,
- .store = integrity_verify_store,
-};
-
-static struct integrity_sysfs_entry integrity_generate_entry = {
- .attr = { .name = "write_generate", .mode = 0644 },
- .show = integrity_generate_show,
- .store = integrity_generate_store,
-};
-
-static struct integrity_sysfs_entry integrity_device_entry = {
- .attr = { .name = "device_is_integrity_capable", .mode = 0444 },
- .show = integrity_device_show,
-};
+static DEVICE_ATTR_RO(format);
+static DEVICE_ATTR_RO(tag_size);
+static DEVICE_ATTR_RO(protection_interval_bytes);
+static DEVICE_ATTR_RW(read_verify);
+static DEVICE_ATTR_RW(write_generate);
+static DEVICE_ATTR_RO(device_is_integrity_capable);

static struct attribute *integrity_attrs[] = {
- &integrity_format_entry.attr,
- &integrity_tag_size_entry.attr,
- &integrity_interval_entry.attr,
- &integrity_verify_entry.attr,
- &integrity_generate_entry.attr,
- &integrity_device_entry.attr,
- NULL,
+ &dev_attr_format.attr,
+ &dev_attr_tag_size.attr,
+ &dev_attr_protection_interval_bytes.attr,
+ &dev_attr_read_verify.attr,
+ &dev_attr_write_generate.attr,
+ &dev_attr_device_is_integrity_capable.attr,
+ NULL
};
ATTRIBUTE_GROUPS(integrity);

--
2.39.2