[PATCH 14/27] Btrfs: sysfs: add pointer to access fs_info from fs_devices

[Anand Jain]

From: Anand Jain <anand.j...@oracle.com>

adds fs_info pointer with struct btrfs_fs_devices.

Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
 fs/btrfs/sysfs.c   |  4 ++++
 fs/btrfs/volumes.c | 18 ++++++++++++++++++
 fs/btrfs/volumes.h |  3 +++
 3 files changed, 25 insertions(+)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index ac15fbb..95d6257 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -530,6 +530,8 @@ static void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices 
*fs_devs)
 
 void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
 {
+       btrfs_reset_fs_info_ptr(fs_info);
+
        if (fs_info->space_info_kobj) {
                sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
                kobject_del(fs_info->space_info_kobj);
@@ -729,6 +731,8 @@ int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
        struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
        struct kobject *super_kobj = &fs_devs->super_kobj;
 
+       btrfs_set_fs_info_ptr(fs_info);
+
        error = btrfs_sysfs_add_fsid(fs_devs, NULL);
        if (error)
                return error;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c1b1038..033e56a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6688,3 +6688,21 @@ void btrfs_update_commit_device_bytes_used(struct 
btrfs_root *root,
        }
        unlock_chunks(root);
 }
+
+void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info)
+{
+       struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+       while (fs_devices) {
+               fs_devices->fs_info = fs_info;
+               fs_devices = fs_devices->seed;
+       }
+}
+
+void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info)
+{
+       struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+       while (fs_devices) {
+               fs_devices->fs_info = NULL;
+               fs_devices = fs_devices->seed;
+       }
+}
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index d4586ac..e6514c7 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -254,6 +254,7 @@ struct btrfs_fs_devices {
         */
        int rotating;
 
+       struct btrfs_fs_info *fs_info;
        /* sysfs kobjects */
        struct kobject super_kobj;
        struct kobject *device_dir_kobj;
@@ -540,5 +541,7 @@ static inline void unlock_chunks(struct btrfs_root *root)
 }
 
 struct list_head *btrfs_get_fs_uuids(void);
+void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info);
+void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);
 
 #endif
-- 
2.0.0.153.g79dcccc

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