[PATCH -next] btrfs: remove unused function btrfs_sysfs_feature_update

[PATCH -next] btrfs: remove unused function btrfs_sysfs_feature_update

[YueHaibing]

There are no in-tree callers.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 fs/btrfs/sysfs.c | 33 ---------------------------------
 fs/btrfs/sysfs.h |  2 --
 2 files changed, 35 deletions(-)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 5a5930e..88f546d 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -872,39 +872,6 @@ int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
 	return error;
 }
 
-
-/*
- * Change per-fs features in /sys/fs/btrfs/UUID/features to match current
- * values in superblock. Call after any changes to incompat/compat_ro flags
- */
-void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
-		u64 bit, enum btrfs_feature_set set)
-{
-	struct btrfs_fs_devices *fs_devs;
-	struct kobject *fsid_kobj;
-	u64 features;
-	int ret;
-
-	if (!fs_info)
-		return;
-
-	features = get_features(fs_info, set);
-	ASSERT(bit & supported_feature_masks[set]);
-
-	fs_devs = fs_info->fs_devices;
-	fsid_kobj = &fs_devs->fsid_kobj;
-
-	if (!fsid_kobj->state_initialized)
-		return;
-
-	/*
-	 * FIXME: this is too heavy to update just one value, ideally we'd like
-	 * to use sysfs_update_group but some refactoring is needed first.
-	 */
-	sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
-	ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
-}
-
 static int btrfs_init_debugfs(void)
 {
 #ifdef CONFIG_DEBUG_FS
diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h
index 40716b3..ce5f4f5 100644
--- a/fs/btrfs/sysfs.h
+++ b/fs/btrfs/sysfs.h
@@ -88,7 +88,5 @@ int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
 				struct kobject *parent);
 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
-void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
-		u64 bit, enum btrfs_feature_set set);
 
 #endif
-- 
2.7.0

Re: [PATCH -next] btrfs: remove unused function btrfs_sysfs_feature_update

[David Sterba]

On Thu, Jan 17, 2019 at 04:48:28PM +0800, YueHaibing wrote:
> There are no in-tree callers.

I'd rather see the code fixed, the patch that used the function was
reverted because it was not safe to call sysfs from various contexts. I
have some wip.