diff options
| author | Nikolay Borisov <nborisov@suse.com> | 2020-07-03 11:13:15 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-07-27 12:55:41 +0200 |
| commit | 3092c68fc58c7bd54a6dde8d42ef05beb41890f5 (patch) | |
| tree | d8dd0541d3816ca6bee745dd0273ab5140df14cf /fs/btrfs/sysfs.c | |
| parent | 5a9472fe7ffecf7390ddcb379fc4d65d392e2373 (diff) | |
btrfs: sysfs: add bdi link to the fsid directory
Since BTRFS uses a private bdi it makes sense to create a link to this
bdi under /sys/fs/btrfs/<UUID>/bdi. This allows size of read ahead to
be controlled. Without this patch it's not possible to uniquely identify
which bdi pertains to which btrfs filesystem in the case of multiple
btrfs filesystems.
It's fine to simply call sysfs_remove_link without checking if the
link indeed has been created. The call path
sysfs_remove_link
kernfs_remove_by_name
kernfs_remove_by_name_ns
will simply return -ENOENT in case it doesn't exist.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/sysfs.c')
| -rw-r--r-- | fs/btrfs/sysfs.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 5885abe57c3e..38c0b95e0e7f 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -937,8 +937,12 @@ void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs) void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) { + struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj; + btrfs_reset_fs_info_ptr(fs_info); + sysfs_remove_link(fsid_kobj, "bdi"); + if (fs_info->space_info_kobj) { sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); kobject_del(fs_info->space_info_kobj); @@ -958,8 +962,8 @@ void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info) } #endif addrm_unknown_feature_attrs(fs_info, false); - sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group); - sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs); + sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group); + sysfs_remove_files(fsid_kobj, btrfs_attrs); btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, NULL); } @@ -1439,6 +1443,10 @@ int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info) if (error) goto failure; + error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi"); + if (error) + goto failure; + fs_info->space_info_kobj = kobject_create_and_add("allocation", fsid_kobj); if (!fs_info->space_info_kobj) { |