From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
Introduces super_block_attribute as helper attribute which
encompasses store() and show() fucntions.
Also includes the macros to define attributes.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
fs/super.c | 38 ++++++++++++++++++++++++++++++++++++++
include/linux/fs.h | 26 ++++++++++++++++++++++++++
2 files changed, 64 insertions(+)
diff --git a/fs/super.c b/fs/super.c
index c6b8801..d6d4d05 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1396,3 +1396,41 @@ out:
return 0;
}
EXPORT_SYMBOL(thaw_super);
+
+static ssize_t super_block_attribute_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ struct super_block_attribute *sattr =
+ container_of(attr, struct super_block_attribute, attr);
+ struct super_block *sb = container_of(kobj, struct super_block, s_kobj);
+ if (!sattr->show)
+ return -EIO;
+
+ return sattr->show(sb, sattr, buf);
+}
+
+static ssize_t super_block_attribute_store(struct kobject *kobj,
+ struct attribute *attr, const char *buf, size_t count)
+{
+ struct super_block_attribute *sattr =
+ container_of(attr, struct super_block_attribute, attr);
+ struct super_block *sb = container_of(kobj, struct super_block, s_kobj);
+ if (!sattr->store)
+ return -EIO;
+
+ return sattr->store(sb, sattr, buf, count);
+}
+
+const struct sysfs_ops super_block_sysfs_ops = {
+ .show = super_block_attribute_show,
+ .store = super_block_attribute_store,
+};
+
+EXPORT_SYMBOL(super_block_sysfs_ops);
+
+void super_block_release(struct kobject *kobj)
+{
+ struct super_block *sb = container_of(kobj, struct super_block, s_kobj);
+ complete(&sb->s_kobj_del);
+}
+EXPORT_SYMBOL(super_block_release);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1cf2e011..117d641 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1423,6 +1423,32 @@ struct super_block {
struct completion s_kobj_del; /* Wait for kobjects deletion */
};
+struct super_block_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct super_block *sb, struct super_block_attribute *,
+ char *buf);
+ ssize_t (*store)(struct super_block *sb, struct super_block_attribute *,
+ const char *buf, size_t count);
+};
+
+#define SB_ATTR(_name, _mode) \
+ struct super_block_attribute sb_attr_##_name = {\
+ .attr = {.name = __stringify(_name), \
+ .mode = _mode}, \
+ .show = _name##_show, \
+ .store = _name##_store, \
+ }
+
+#define SB_ATTR_RO(_name) \
+ struct super_block_attribute sb_attr_##_name = {\
+ .attr = {.name = __stringify(_name), \
+ .mode = S_IRUGO}, \
+ .show = _name##_show, \
+ }
+
+extern const struct sysfs_ops super_block_sysfs_ops;
+void super_block_release(struct kobject *kobj);
+
extern struct timespec current_fs_time(struct super_block *sb);
/*
--
2.6.6
--
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