mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
80e9baed72
Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
433 lines
14 KiB
C
433 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2014 Facebook. All rights reserved.
|
|
*/
|
|
|
|
#ifndef BTRFS_QGROUP_H
|
|
#define BTRFS_QGROUP_H
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/rbtree.h>
|
|
#include <linux/kobject.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.
|
|
*/
|
|
|
|
/*
|
|
* Special performance optimization for balance.
|
|
*
|
|
* For balance, we need to swap subtree of subvolume and reloc trees.
|
|
* In theory, we need to trace all subtree blocks of both subvolume and reloc
|
|
* trees, since their owner has changed during such swap.
|
|
*
|
|
* However since balance has ensured that both subtrees are containing the
|
|
* same contents and have the same tree structures, such swap won't cause
|
|
* qgroup number change.
|
|
*
|
|
* But there is a race window between subtree swap and transaction commit,
|
|
* during that window, if we increase/decrease tree level or merge/split tree
|
|
* blocks, we still need to trace the original subtrees.
|
|
*
|
|
* So for balance, we use a delayed subtree tracing, whose workflow is:
|
|
*
|
|
* 1) Record the subtree root block get swapped.
|
|
*
|
|
* During subtree swap:
|
|
* O = Old tree blocks
|
|
* N = New tree blocks
|
|
* reloc tree subvolume tree X
|
|
* Root Root
|
|
* / \ / \
|
|
* NA OB OA OB
|
|
* / | | \ / | | \
|
|
* NC ND OE OF OC OD OE OF
|
|
*
|
|
* In this case, NA and OA are going to be swapped, record (NA, OA) into
|
|
* subvolume tree X.
|
|
*
|
|
* 2) After subtree swap.
|
|
* reloc tree subvolume tree X
|
|
* Root Root
|
|
* / \ / \
|
|
* OA OB NA OB
|
|
* / | | \ / | | \
|
|
* OC OD OE OF NC ND OE OF
|
|
*
|
|
* 3a) COW happens for OB
|
|
* If we are going to COW tree block OB, we check OB's bytenr against
|
|
* tree X's swapped_blocks structure.
|
|
* If it doesn't fit any, nothing will happen.
|
|
*
|
|
* 3b) COW happens for NA
|
|
* Check NA's bytenr against tree X's swapped_blocks, and get a hit.
|
|
* Then we do subtree scan on both subtrees OA and NA.
|
|
* Resulting 6 tree blocks to be scanned (OA, OC, OD, NA, NC, ND).
|
|
*
|
|
* Then no matter what we do to subvolume tree X, qgroup numbers will
|
|
* still be correct.
|
|
* Then NA's record gets removed from X's swapped_blocks.
|
|
*
|
|
* 4) Transaction commit
|
|
* Any record in X's swapped_blocks gets removed, since there is no
|
|
* modification to the swapped subtrees, no need to trigger heavy qgroup
|
|
* subtree rescan for them.
|
|
*/
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* For qgroup reserved data space freeing.
|
|
*
|
|
* @data_rsv_refroot and @data_rsv will be recorded after
|
|
* BTRFS_ADD_DELAYED_EXTENT is called.
|
|
* And will be used to free reserved qgroup space at
|
|
* transaction commit time.
|
|
*/
|
|
u32 data_rsv; /* reserved data space needs to be freed */
|
|
u64 data_rsv_refroot; /* which root the reserved data belongs to */
|
|
struct ulist *old_roots;
|
|
};
|
|
|
|
struct btrfs_qgroup_swapped_block {
|
|
struct rb_node node;
|
|
|
|
int level;
|
|
bool trace_leaf;
|
|
|
|
/* bytenr/generation of the tree block in subvolume tree after swap */
|
|
u64 subvol_bytenr;
|
|
u64 subvol_generation;
|
|
|
|
/* bytenr/generation of the tree block in reloc tree after swap */
|
|
u64 reloc_bytenr;
|
|
u64 reloc_generation;
|
|
|
|
u64 last_snapshot;
|
|
struct btrfs_key first_key;
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
#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_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);
|
|
|
|
#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 btrfs_inode *inode,
|
|
struct extent_changeset **reserved, u64 start, u64 len);
|
|
int btrfs_qgroup_release_data(struct btrfs_inode *inode, u64 start, u64 len);
|
|
int btrfs_qgroup_free_data(struct btrfs_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);
|
|
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 btrfs_inode *inode);
|
|
|
|
/* btrfs_qgroup_swapped_blocks related functions */
|
|
void btrfs_qgroup_init_swapped_blocks(
|
|
struct btrfs_qgroup_swapped_blocks *swapped_blocks);
|
|
|
|
void btrfs_qgroup_clean_swapped_blocks(struct btrfs_root *root);
|
|
int btrfs_qgroup_add_swapped_blocks(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *subvol_root,
|
|
struct btrfs_block_group *bg,
|
|
struct extent_buffer *subvol_parent, int subvol_slot,
|
|
struct extent_buffer *reloc_parent, int reloc_slot,
|
|
u64 last_snapshot);
|
|
int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct extent_buffer *eb);
|
|
void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans);
|
|
bool btrfs_check_quota_leak(struct btrfs_fs_info *fs_info);
|
|
|
|
#endif
|