From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: [PATCH 7/8] dm sysfs: introduce ability to add writable attributes Date: Tue, 3 Mar 2015 19:47:10 -0500 Message-ID: <1425430031-78140-8-git-send-email-snitzer@redhat.com> References: <1425430031-78140-1-git-send-email-snitzer@redhat.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1425430031-78140-1-git-send-email-snitzer@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: dm-devel@redhat.com Cc: axboe@kernel.dk, jmoyer@redhat.com List-Id: dm-devel.ids Add DM_ATTR_RW() macro and establish .store method in dm_sysfs_ops. Signed-off-by: Mike Snitzer --- drivers/md/dm-sysfs.c | 32 +++++++++++++++++++++++++++----- 1 file changed, 27 insertions(+), 5 deletions(-) diff --git a/drivers/md/dm-sysfs.c b/drivers/md/dm-sysfs.c index c62c5ab..1271c31 100644 --- a/drivers/md/dm-sysfs.c +++ b/drivers/md/dm-sysfs.c @@ -11,7 +11,7 @@ struct dm_sysfs_attr { struct attribute attr; ssize_t (*show)(struct mapped_device *, char *); - ssize_t (*store)(struct mapped_device *, char *); + ssize_t (*store)(struct mapped_device *, const char *, size_t count); }; #define DM_ATTR_RO(_name) \ @@ -39,6 +39,31 @@ static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr, return ret; } +#define DM_ATTR_RW(_name) \ +struct dm_sysfs_attr dm_attr_##_name = \ + __ATTR(_name, S_IRUGO | S_IWUSR, dm_attr_##_name##_show, dm_attr_##_name##_store) + +static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr, + const char *page, size_t count) +{ + struct dm_sysfs_attr *dm_attr; + struct mapped_device *md; + ssize_t ret; + + dm_attr = container_of(attr, struct dm_sysfs_attr, attr); + if (!dm_attr->store) + return -EIO; + + md = dm_get_from_kobject(kobj); + if (!md) + return -EINVAL; + + ret = dm_attr->store(md, page, count); + dm_put(md); + + return ret; +} + static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf) { if (dm_copy_name_and_uuid(md, buf, NULL)) @@ -77,12 +102,9 @@ static struct attribute *dm_attrs[] = { static const struct sysfs_ops dm_sysfs_ops = { .show = dm_attr_show, + .store = dm_attr_store, }; -/* - * dm kobject is embedded in mapped_device structure - * no need to define release function here - */ static struct kobj_type dm_ktype = { .sysfs_ops = &dm_sysfs_ops, .default_attrs = dm_attrs, -- 1.9.3 (Apple Git-50)