From: Jeff Mahoney Date: Fri, 1 Nov 2013 17:07:05 +0000 (-0400) Subject: btrfs: publish device membership in sysfs X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=29e5be240a3caf175364fdeecb0441dff500d5d9;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git btrfs: publish device membership in sysfs Now that we have the infrastructure for per-super attributes, we can publish device membership in /sys/fs/btrfs//devices. The information is published as symlinks to the block devices. Signed-off-by: Jeff Mahoney Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index f608306b5d88..dbe9b313cdf2 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1530,6 +1530,7 @@ struct btrfs_fs_info { struct kobject super_kobj; struct kobject *space_info_kobj; + struct kobject *device_dir_kobj; struct completion kobj_unregister; int do_barriers; int closing; diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index e060958a6382..ec6315391111 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -23,11 +23,13 @@ #include #include #include +#include #include "ctree.h" #include "disk-io.h" #include "transaction.h" #include "sysfs.h" +#include "volumes.h" static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); @@ -374,6 +376,8 @@ static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) { sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); + kobject_del(fs_info->device_dir_kobj); + kobject_put(fs_info->device_dir_kobj); kobject_del(fs_info->space_info_kobj); kobject_put(fs_info->space_info_kobj); kobject_del(&fs_info->super_kobj); @@ -507,6 +511,30 @@ static int add_unknown_feature_attrs(struct btrfs_fs_info *fs_info) return 0; } +static int add_device_membership(struct btrfs_fs_info *fs_info) +{ + int error = 0; + struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; + struct btrfs_device *dev; + + fs_info->device_dir_kobj = kobject_create_and_add("devices", + &fs_info->super_kobj); + if (!fs_info->device_dir_kobj) + return -ENOMEM; + + list_for_each_entry(dev, &fs_devices->devices, dev_list) { + struct hd_struct *disk = dev->bdev->bd_part; + struct kobject *disk_kobj = &part_to_dev(disk)->kobj; + + error = sysfs_create_link(fs_info->device_dir_kobj, + disk_kobj, disk_kobj->name); + if (error) + break; + } + + return error; +} + /* /sys/fs/btrfs/ entry */ static struct kset *btrfs_kset; @@ -528,6 +556,10 @@ int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) if (error) goto failure; + error = add_device_membership(fs_info); + if (error) + goto failure; + fs_info->space_info_kobj = kobject_create_and_add("allocation", &fs_info->super_kobj); if (!fs_info->space_info_kobj) {