linux/fs/btrfs/qgroup.h
Andrea Gelmini 52042d8e82 btrfs: Fix typos in comments and strings
The typos accumulate over time so once in a while time they get fixed in
a large patch.

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2018-12-17 14:51:50 +01:00

329 lines
10 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2014 Facebook. All rights reserved.
*/
#ifndef BTRFS_QGROUP_H
#define BTRFS_QGROUP_H
#include "ulist.h"
#include "delayed-ref.h"
/*
* Btrfs qgroup overview
*
* Btrfs qgroup splits into 3 main part:
* 1) Reserve
* Reserve metadata/data space for incoming operations
* Affect how qgroup limit works
*
* 2) Trace
* Tell btrfs qgroup to trace dirty extents.
*
* Dirty extents including:
* - Newly allocated extents
* - Extents going to be deleted (in this trans)
* - Extents whose owner is going to be modified
*
* This is the main part affects whether qgroup numbers will stay
* consistent.
* Btrfs qgroup can trace clean extents and won't cause any problem,
* but it will consume extra CPU time, it should be avoided if possible.
*
* 3) Account
* Btrfs qgroup will updates its numbers, based on dirty extents traced
* in previous step.
*
* Normally at qgroup rescan and transaction commit time.
*/
/*
* Record a dirty extent, and info qgroup to update quota on it
* TODO: Use kmem cache to alloc it.
*/
struct btrfs_qgroup_extent_record {
struct rb_node node;
u64 bytenr;
u64 num_bytes;
struct ulist *old_roots;
};
/*
* Qgroup reservation types:
*
* DATA:
* space reserved for data
*
* META_PERTRANS:
* Space reserved for metadata (per-transaction)
* Due to the fact that qgroup data is only updated at transaction commit
* time, reserved space for metadata must be kept until transaction
* commits.
* Any metadata reserved that are used in btrfs_start_transaction() should
* be of this type.
*
* META_PREALLOC:
* There are cases where metadata space is reserved before starting
* transaction, and then btrfs_join_transaction() to get a trans handle.
* Any metadata reserved for such usage should be of this type.
* And after join_transaction() part (or all) of such reservation should
* be converted into META_PERTRANS.
*/
enum btrfs_qgroup_rsv_type {
BTRFS_QGROUP_RSV_DATA,
BTRFS_QGROUP_RSV_META_PERTRANS,
BTRFS_QGROUP_RSV_META_PREALLOC,
BTRFS_QGROUP_RSV_LAST,
};
/*
* Represents how many bytes we have reserved for this qgroup.
*
* Each type should have different reservation behavior.
* E.g, data follows its io_tree flag modification, while
* *currently* meta is just reserve-and-clear during transaction.
*
* TODO: Add new type for reservation which can survive transaction commit.
* Current metadata reservation behavior is not suitable for such case.
*/
struct btrfs_qgroup_rsv {
u64 values[BTRFS_QGROUP_RSV_LAST];
};
/*
* one struct for each qgroup, organized in fs_info->qgroup_tree.
*/
struct btrfs_qgroup {
u64 qgroupid;
/*
* state
*/
u64 rfer; /* referenced */
u64 rfer_cmpr; /* referenced compressed */
u64 excl; /* exclusive */
u64 excl_cmpr; /* exclusive compressed */
/*
* limits
*/
u64 lim_flags; /* which limits are set */
u64 max_rfer;
u64 max_excl;
u64 rsv_rfer;
u64 rsv_excl;
/*
* reservation tracking
*/
struct btrfs_qgroup_rsv rsv;
/*
* lists
*/
struct list_head groups; /* groups this group is member of */
struct list_head members; /* groups that are members of this group */
struct list_head dirty; /* dirty groups */
struct rb_node node; /* tree of qgroups */
/*
* temp variables for accounting operations
* Refer to qgroup_shared_accounting() for details.
*/
u64 old_refcnt;
u64 new_refcnt;
};
/*
* For qgroup event trace points only
*/
#define QGROUP_RESERVE (1<<0)
#define QGROUP_RELEASE (1<<1)
#define QGROUP_FREE (1<<2)
int btrfs_quota_enable(struct btrfs_fs_info *fs_info);
int btrfs_quota_disable(struct btrfs_fs_info *fs_info);
int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);
void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info);
int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info,
bool interruptible);
int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
u64 dst);
int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
u64 dst);
int btrfs_create_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid);
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid);
int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid,
struct btrfs_qgroup_limit *limit);
int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
struct btrfs_delayed_extent_op;
/*
* Inform qgroup to trace one dirty extent, its info is recorded in @record.
* So qgroup can account it at transaction committing time.
*
* No lock version, caller must acquire delayed ref lock and allocated memory,
* then call btrfs_qgroup_trace_extent_post() after exiting lock context.
*
* Return 0 for success insert
* Return >0 for existing record, caller can free @record safely.
* Error is not possible
*/
int btrfs_qgroup_trace_extent_nolock(
struct btrfs_fs_info *fs_info,
struct btrfs_delayed_ref_root *delayed_refs,
struct btrfs_qgroup_extent_record *record);
/*
* Post handler after qgroup_trace_extent_nolock().
*
* NOTE: Current qgroup does the expensive backref walk at transaction
* committing time with TRANS_STATE_COMMIT_DOING, this blocks incoming
* new transaction.
* This is designed to allow btrfs_find_all_roots() to get correct new_roots
* result.
*
* However for old_roots there is no need to do backref walk at that time,
* since we search commit roots to walk backref and result will always be
* correct.
*
* Due to the nature of no lock version, we can't do backref there.
* So we must call btrfs_qgroup_trace_extent_post() after exiting
* spinlock context.
*
* TODO: If we can fix and prove btrfs_find_all_roots() can get correct result
* using current root, then we can move all expensive backref walk out of
* transaction committing, but not now as qgroup accounting will be wrong again.
*/
int btrfs_qgroup_trace_extent_post(struct btrfs_fs_info *fs_info,
struct btrfs_qgroup_extent_record *qrecord);
/*
* Inform qgroup to trace one dirty extent, specified by @bytenr and
* @num_bytes.
* So qgroup can account it at commit trans time.
*
* Better encapsulated version, with memory allocation and backref walk for
* commit roots.
* So this can sleep.
*
* Return 0 if the operation is done.
* Return <0 for error, like memory allocation failure or invalid parameter
* (NULL trans)
*/
int btrfs_qgroup_trace_extent(struct btrfs_trans_handle *trans, u64 bytenr,
u64 num_bytes, gfp_t gfp_flag);
/*
* Inform qgroup to trace all leaf items of data
*
* Return 0 for success
* Return <0 for error(ENOMEM)
*/
int btrfs_qgroup_trace_leaf_items(struct btrfs_trans_handle *trans,
struct extent_buffer *eb);
/*
* Inform qgroup to trace a whole subtree, including all its child tree
* blocks and data.
* The root tree block is specified by @root_eb.
*
* Normally used by relocation(tree block swap) and subvolume deletion.
*
* Return 0 for success
* Return <0 for error(ENOMEM or tree search error)
*/
int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
struct extent_buffer *root_eb,
u64 root_gen, int root_level);
int btrfs_qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
struct btrfs_block_group_cache *bg_cache,
struct extent_buffer *src_parent, int src_slot,
struct extent_buffer *dst_parent, int dst_slot,
u64 last_snapshot);
int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr,
u64 num_bytes, struct ulist *old_roots,
struct ulist *new_roots);
int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans);
int btrfs_run_qgroups(struct btrfs_trans_handle *trans);
int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid,
u64 objectid, struct btrfs_qgroup_inherit *inherit);
void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
u64 ref_root, u64 num_bytes,
enum btrfs_qgroup_rsv_type type);
static inline void btrfs_qgroup_free_delayed_ref(struct btrfs_fs_info *fs_info,
u64 ref_root, u64 num_bytes)
{
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
return;
trace_btrfs_qgroup_free_delayed_ref(fs_info, ref_root, num_bytes);
btrfs_qgroup_free_refroot(fs_info, ref_root, num_bytes,
BTRFS_QGROUP_RSV_DATA);
}
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
u64 rfer, u64 excl);
#endif
/* New io_tree based accurate qgroup reserve API */
int btrfs_qgroup_reserve_data(struct inode *inode,
struct extent_changeset **reserved, u64 start, u64 len);
int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len);
int btrfs_qgroup_free_data(struct inode *inode,
struct extent_changeset *reserved, u64 start, u64 len);
int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
enum btrfs_qgroup_rsv_type type, bool enforce);
/* Reserve metadata space for pertrans and prealloc type */
static inline int btrfs_qgroup_reserve_meta_pertrans(struct btrfs_root *root,
int num_bytes, bool enforce)
{
return __btrfs_qgroup_reserve_meta(root, num_bytes,
BTRFS_QGROUP_RSV_META_PERTRANS, enforce);
}
static inline int btrfs_qgroup_reserve_meta_prealloc(struct btrfs_root *root,
int num_bytes, bool enforce)
{
return __btrfs_qgroup_reserve_meta(root, num_bytes,
BTRFS_QGROUP_RSV_META_PREALLOC, enforce);
}
void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes,
enum btrfs_qgroup_rsv_type type);
/* Free per-transaction meta reservation for error handling */
static inline void btrfs_qgroup_free_meta_pertrans(struct btrfs_root *root,
int num_bytes)
{
__btrfs_qgroup_free_meta(root, num_bytes,
BTRFS_QGROUP_RSV_META_PERTRANS);
}
/* Pre-allocated meta reservation can be freed at need */
static inline void btrfs_qgroup_free_meta_prealloc(struct btrfs_root *root,
int num_bytes)
{
__btrfs_qgroup_free_meta(root, num_bytes,
BTRFS_QGROUP_RSV_META_PREALLOC);
}
/*
* Per-transaction meta reservation should be all freed at transaction commit
* time
*/
void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root);
/*
* Convert @num_bytes of META_PREALLOCATED reservation to META_PERTRANS.
*
* This is called when preallocated meta reservation needs to be used.
* Normally after btrfs_join_transaction() call.
*/
void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes);
void btrfs_qgroup_check_reserved_leak(struct inode *inode);
#endif