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Commit 630dc772 authored by Arne Jansen's avatar Arne Jansen Committed by Jan Schmidt
Browse files

Btrfs: qgroup on-disk format 



Not all features are in use by the current version
and thus may change in the future.

Signed-off-by: default avatarArne Jansen <sensille@gmx.net>
parent 097b8a7c

fs/btrfs/ctree.h

+136 −0
Original line number Diff line number Diff line
@@ -91,6 +91,9 @@ struct btrfs_ordered_sum; 
/* for storing balance parameters in the root tree */

#define BTRFS_BALANCE_OBJECTID -4ULL



/* holds quota configuration and tracking */

#define BTRFS_QUOTA_TREE_OBJECTID 8ULL



/* orhpan objectid for tracking unlinked/truncated files */

#define BTRFS_ORPHAN_OBJECTID -5ULL
@@ -883,6 +886,72 @@ struct btrfs_block_group_item { 
	__le64 flags;

} __attribute__ ((__packed__));



/*

 * is subvolume quota turned on?

 */

#define BTRFS_QGROUP_STATUS_FLAG_ON		(1ULL << 0)

/*

 * SCANNING is set during the initialization phase

 */

#define BTRFS_QGROUP_STATUS_FLAG_SCANNING	(1ULL << 1)

/*

 * Some qgroup entries are known to be out of date,

 * either because the configuration has changed in a way that

 * makes a rescan necessary, or because the fs has been mounted

 * with a non-qgroup-aware version.

 * Turning qouta off and on again makes it inconsistent, too.

 */

#define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT	(1ULL << 2)



#define BTRFS_QGROUP_STATUS_VERSION        1



struct btrfs_qgroup_status_item {

	__le64 version;

	/*

	 * the generation is updated during every commit. As older

	 * versions of btrfs are not aware of qgroups, it will be

	 * possible to detect inconsistencies by checking the

	 * generation on mount time

	 */

	__le64 generation;



	/* flag definitions see above */

	__le64 flags;



	/*

	 * only used during scanning to record the progress

	 * of the scan. It contains a logical address

	 */

	__le64 scan;

} __attribute__ ((__packed__));



struct btrfs_qgroup_info_item {

	__le64 generation;

	__le64 rfer;

	__le64 rfer_cmpr;

	__le64 excl;

	__le64 excl_cmpr;

} __attribute__ ((__packed__));



/* flags definition for qgroup limits */

#define BTRFS_QGROUP_LIMIT_MAX_RFER	(1ULL << 0)

#define BTRFS_QGROUP_LIMIT_MAX_EXCL	(1ULL << 1)

#define BTRFS_QGROUP_LIMIT_RSV_RFER	(1ULL << 2)

#define BTRFS_QGROUP_LIMIT_RSV_EXCL	(1ULL << 3)

#define BTRFS_QGROUP_LIMIT_RFER_CMPR	(1ULL << 4)

#define BTRFS_QGROUP_LIMIT_EXCL_CMPR	(1ULL << 5)



struct btrfs_qgroup_limit_item {

	/*

	 * only updated when any of the other values change

	 */

	__le64 flags;

	__le64 max_rfer;

	__le64 max_excl;

	__le64 rsv_rfer;

	__le64 rsv_excl;

} __attribute__ ((__packed__));



struct btrfs_space_info {

	u64 flags;
@@ -1534,6 +1603,30 @@ struct btrfs_ioctl_defrag_range_args { 
#define BTRFS_DEV_ITEM_KEY	216

#define BTRFS_CHUNK_ITEM_KEY	228



/*

 * Records the overall state of the qgroups.

 * There's only one instance of this key present,

 * (0, BTRFS_QGROUP_STATUS_KEY, 0)

 */

#define BTRFS_QGROUP_STATUS_KEY         240

/*

 * Records the currently used space of the qgroup.

 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).

 */

#define BTRFS_QGROUP_INFO_KEY           242

/*

 * Contains the user configured limits for the qgroup.

 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).

 */

#define BTRFS_QGROUP_LIMIT_KEY          244

/*

 * Records the child-parent relationship of qgroups. For

 * each relation, 2 keys are present:

 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)

 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)

 */

#define BTRFS_QGROUP_RELATION_KEY       246



#define BTRFS_BALANCE_ITEM_KEY	248



/*
@@ -2474,6 +2567,49 @@ static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb, 
			    sizeof(val));

}



/* btrfs_qgroup_status_item */

BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,

		   generation, 64);

BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,

		   version, 64);

BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,

		   flags, 64);

BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,

		   scan, 64);



/* btrfs_qgroup_info_item */

BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,

		   generation, 64);

BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);

BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,

		   rfer_cmpr, 64);

BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);

BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,

		   excl_cmpr, 64);



BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,

			 struct btrfs_qgroup_info_item, generation, 64);

BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,

			 rfer, 64);

BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,

			 struct btrfs_qgroup_info_item, rfer_cmpr, 64);

BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,

			 excl, 64);

BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,

			 struct btrfs_qgroup_info_item, excl_cmpr, 64);



/* btrfs_qgroup_limit_item */

BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,

		   flags, 64);

BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,

		   max_rfer, 64);

BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,

		   max_excl, 64);

BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,

		   rsv_rfer, 64);

BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,

		   rsv_excl, 64);



static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)

{

	return sb->s_fs_info;