[PATCH 5.15 476/691] blk-integrity: convert to struct device_attribute

15 Oct 2024

5.15-stable review patch.  If anyone has any objections, please let me know.
------------------
From: Thomas Weißschuh linux@weissschuh.net
Upstream commit 76b8c319f02715e14abdbbbdd6508e83a1059bcc.
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
Reviewed-by: Christoph Hellwig hch@lst.de
Reviewed-by: Martin K. Petersen martin.petersen@oracle.com
Link: https://lore.kernel.org/r/20230309-kobj_release-gendisk_integrity-v3-2-ceccb...
Signed-off-by: Jens Axboe axboe@kernel.dk
Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@igalia.com
Signed-off-by: Sasha Levin sashal@kernel.org
---
 block/blk-integrity.c | 127 +++++++++++++++++++++---------------------
 1 file changed, 62 insertions(+), 65 deletions(-)

diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index cbc77a2de0376..8868b1e01d58b 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,
@@ -234,38 +228,53 @@ 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);
-	ssize_t ret = 0;
+	struct device *dev = disk_to_dev(disk);
+	struct device_attribute *dev_attr =
+		container_of(attr, struct device_attribute, attr);
-	if (entry->store)
-		ret = entry->store(bi, page, count);
+	if (!dev_attr->store)
+		return 0;
+	return dev_attr->store(dev, dev_attr, page, count);
+}
-	return ret;
+static inline struct blk_integrity *dev_to_bi(struct device *dev)
+{
+	return &dev_to_disk(dev)->queue->integrity;
 }
-static ssize_t integrity_format_show(struct blk_integrity *bi, char *page)
+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);
    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);
@@ -277,14 +286,20 @@ 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));
 }
-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);
@@ -296,57 +311,39 @@ 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));
 }
-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));
 }
-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);
-- 
2.43.0





    

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[PATCH 5.15 476/691] blk-integrity: convert to struct device_attribute