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| author | Qu Wenruo <wqu@suse.com> | 2020-06-28 13:07:15 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-07-27 12:55:37 +0200 |
| commit | 49e5fb46211de0744170928466e68166eabbd8b3 (patch) | |
| tree | d46a857d6495925542479ff60df0257f07a1b324 /fs/btrfs/qgroup.h | |
| parent | 06f67c47076e5c3ee65276171596479dcc3a3941 (diff) | |
| download | lwn-49e5fb46211de0744170928466e68166eabbd8b3.tar.gz lwn-49e5fb46211de0744170928466e68166eabbd8b3.zip | |
btrfs: qgroup: export qgroups in sysfs
This patch will add the following sysfs interface:
/sys/fs/btrfs/<UUID>/qgroups/<qgroup_id>/referenced
/sys/fs/btrfs/<UUID>/qgroups/<qgroup_id>/exclusive
/sys/fs/btrfs/<UUID>/qgroups/<qgroup_id>/max_referenced
/sys/fs/btrfs/<UUID>/qgroups/<qgroup_id>/max_exclusive
/sys/fs/btrfs/<UUID>/qgroups/<qgroup_id>/limit_flags
Which is also available in output of "btrfs qgroup show".
/sys/fs/btrfs/<UUID>/qgroups/<qgroup_id>/rsv_data
/sys/fs/btrfs/<UUID>/qgroups/<qgroup_id>/rsv_meta_pertrans
/sys/fs/btrfs/<UUID>/qgroups/<qgroup_id>/rsv_meta_prealloc
The last 3 rsv related members are not visible to users, but can be very
useful to debug qgroup limit related bugs.
Also, to avoid '/' used in <qgroup_id>, the separator between qgroup
level and qgroup id is changed to '_'.
The interface is not hidden behind 'debug' as we want this interface to
be included into production build and to provide another way to read the
qgroup information besides the ioctls.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/qgroup.h')
| -rw-r--r-- | fs/btrfs/qgroup.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h index f7d6f06ab555..50dea9a2d8fb 100644 --- a/fs/btrfs/qgroup.h +++ b/fs/btrfs/qgroup.h @@ -8,6 +8,7 @@ #include <linux/spinlock.h> #include <linux/rbtree.h> +#include <linux/kobject.h> #include "ulist.h" #include "delayed-ref.h" @@ -223,8 +224,18 @@ struct btrfs_qgroup { */ u64 old_refcnt; u64 new_refcnt; + + /* + * Sysfs kobjectid + */ + struct kobject kobj; }; +static inline u64 btrfs_qgroup_subvolid(u64 qgroupid) +{ + return (qgroupid & ((1ULL << BTRFS_QGROUP_LEVEL_SHIFT) - 1)); +} + /* * For qgroup event trace points only */ |