[patch 04/13] btrfs: publish per-super attributes in sysfs

[Jeff Mahoney <jeffm@suse.com>]

This patch adds per-super attributes to sysfs.

It doesn't publish any attributes yet, but does the proper lifetime
handling as well as the basic infrastructure to add new attributes.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 fs/btrfs/ctree.h   |    2 ++
 fs/btrfs/disk-io.c |    9 +++++++++
 fs/btrfs/sysfs.c   |   36 ++++++++++++++++++++++++++++++++++++
 fs/btrfs/sysfs.h   |   10 ++++++++++
 4 files changed, 57 insertions(+)

--- a/fs/btrfs/ctree.h	2013-10-21 16:30:27.122204722 -0400
+++ b/fs/btrfs/ctree.h	2013-10-21 16:30:39.390053476 -0400
@@ -3771,6 +3771,8 @@ int btrfs_defrag_leaves(struct btrfs_tra
 /* sysfs.c */
 int btrfs_init_sysfs(void);
 void btrfs_exit_sysfs(void);
+int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info);
+void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info);
 
 /* xattr.c */
 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
--- a/fs/btrfs/disk-io.c	2013-10-21 16:30:27.126204673 -0400
+++ b/fs/btrfs/disk-io.c	2013-10-21 16:30:39.394053427 -0400
@@ -49,6 +49,7 @@
 #include "rcu-string.h"
 #include "dev-replace.h"
 #include "raid56.h"
+#include "sysfs.h"
 
 #ifdef CONFIG_X86
 #include <asm/cpufeature.h>
@@ -2751,6 +2752,12 @@ retry_root_backup:
 
 	btrfs_close_extra_devices(fs_info, fs_devices, 1);
 
+	ret = btrfs_sysfs_add_one(fs_info);
+	if (ret) {
+		pr_err("btrfs: failed to init sysfs interface: %d\n", ret);
+		goto fail_block_groups;
+	}
+
 	ret = btrfs_init_space_info(fs_info);
 	if (ret) {
 		printk(KERN_ERR "Failed to initial space info: %d\n", ret);
@@ -3618,6 +3625,8 @@ int close_ctree(struct btrfs_root *root)
 
 	btrfs_stop_all_workers(fs_info);
 
+	btrfs_sysfs_remove_one(fs_info);
+
 	del_fs_roots(fs_info);
 
 	free_root_pointers(fs_info, 1);
--- a/fs/btrfs/sysfs.c	2013-10-21 16:30:27.126204673 -0400
+++ b/fs/btrfs/sysfs.c	2013-10-21 16:30:39.394053427 -0400
@@ -28,6 +28,25 @@
 #include "transaction.h"
 #include "sysfs.h"
 
+static void btrfs_release_super_kobj(struct kobject *kobj);
+static struct kobj_type btrfs_ktype = {
+	.sysfs_ops	= &kobj_sysfs_ops,
+	.release	= btrfs_release_super_kobj,
+};
+
+static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
+{
+	if (kobj->ktype != &btrfs_ktype)
+		return NULL;
+	return container_of(kobj, struct btrfs_fs_info, super_kobj);
+}
+
+static void btrfs_release_super_kobj(struct kobject *kobj)
+{
+	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
+	complete(&fs_info->kobj_unregister);
+}
+
 static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
 				       struct kobj_attribute *a, char *buf)
 {
@@ -65,6 +84,23 @@ static const struct attribute_group btrf
 /* /sys/fs/btrfs/ entry */
 static struct kset *btrfs_kset;
 
+void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
+{
+	kobject_del(&fs_info->super_kobj);
+	kobject_put(&fs_info->super_kobj);
+	wait_for_completion(&fs_info->kobj_unregister);
+}
+
+int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
+{
+	int error;
+
+	init_completion(&fs_info->kobj_unregister);
+	error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
+				     "%pU", fs_info->fsid);
+	return error;
+}
+
 int btrfs_init_sysfs(void)
 {
 	int ret;
--- a/fs/btrfs/sysfs.h	2013-10-21 16:30:27.126204673 -0400
+++ b/fs/btrfs/sysfs.h	2013-10-21 16:30:39.394053427 -0400
@@ -15,6 +15,13 @@ enum btrfs_feature_set {
 	.store	= _store,						\
 }
 
+#define BTRFS_ATTR_RW(_name, _mode, _show, _store)			\
+static struct kobj_attribute btrfs_attr_##_name =			\
+			__INIT_KOBJ_ATTR(_name, _mode, _show, _store)
+#define BTRFS_ATTR(_name, _mode, _show)					\
+	BTRFS_ATTR_RW(_name, _mode, _show, NULL)
+#define BTRFS_ATTR_PTR(_name)    (&btrfs_attr_##_name.attr)
+
 struct btrfs_feature_attr {
 	struct kobj_attribute kobj_attr;
 	enum btrfs_feature_set feature_set;
@@ -40,4 +47,7 @@ static struct btrfs_feature_attr btrfs_a
 /* convert from attribute */
 #define to_btrfs_feature_attr(a) \
 			container_of(a, struct btrfs_feature_attr, kobj_attr)
+#define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr)
+#define attr_to_btrfs_feature_attr(a) \
+			to_btrfs_feature_attr(attr_to_btrfs_attr(a))
 #endif /* _BTRFS_SYSFS_H_ */