450 lines
15 KiB
C
450 lines
15 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2014 Facebook. All rights reserved.
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*/
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#ifndef BTRFS_QGROUP_H
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#define BTRFS_QGROUP_H
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/rbtree.h>
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#include <linux/kobject.h>
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#include <linux/list.h>
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#include <uapi/linux/btrfs_tree.h>
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struct extent_buffer;
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struct extent_changeset;
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struct btrfs_delayed_extent_op;
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struct btrfs_fs_info;
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struct btrfs_root;
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struct btrfs_ioctl_quota_ctl_args;
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struct btrfs_trans_handle;
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struct btrfs_delayed_ref_root;
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struct btrfs_inode;
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/*
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* Btrfs qgroup overview
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*
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* Btrfs qgroup splits into 3 main part:
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* 1) Reserve
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* Reserve metadata/data space for incoming operations
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* Affect how qgroup limit works
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*
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* 2) Trace
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* Tell btrfs qgroup to trace dirty extents.
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*
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* Dirty extents including:
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* - Newly allocated extents
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* - Extents going to be deleted (in this trans)
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* - Extents whose owner is going to be modified
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*
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* This is the main part affects whether qgroup numbers will stay
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* consistent.
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* Btrfs qgroup can trace clean extents and won't cause any problem,
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* but it will consume extra CPU time, it should be avoided if possible.
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*
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* 3) Account
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* Btrfs qgroup will updates its numbers, based on dirty extents traced
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* in previous step.
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*
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* Normally at qgroup rescan and transaction commit time.
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*/
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/*
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* Special performance optimization for balance.
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*
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* For balance, we need to swap subtree of subvolume and reloc trees.
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* In theory, we need to trace all subtree blocks of both subvolume and reloc
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* trees, since their owner has changed during such swap.
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*
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* However since balance has ensured that both subtrees are containing the
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* same contents and have the same tree structures, such swap won't cause
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* qgroup number change.
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*
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* But there is a race window between subtree swap and transaction commit,
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* during that window, if we increase/decrease tree level or merge/split tree
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* blocks, we still need to trace the original subtrees.
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*
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* So for balance, we use a delayed subtree tracing, whose workflow is:
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*
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* 1) Record the subtree root block get swapped.
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*
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* During subtree swap:
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* O = Old tree blocks
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* N = New tree blocks
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* reloc tree subvolume tree X
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* Root Root
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* / \ / \
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* NA OB OA OB
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* / | | \ / | | \
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* NC ND OE OF OC OD OE OF
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*
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* In this case, NA and OA are going to be swapped, record (NA, OA) into
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* subvolume tree X.
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*
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* 2) After subtree swap.
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* reloc tree subvolume tree X
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* Root Root
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* / \ / \
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* OA OB NA OB
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* / | | \ / | | \
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* OC OD OE OF NC ND OE OF
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*
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* 3a) COW happens for OB
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* If we are going to COW tree block OB, we check OB's bytenr against
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* tree X's swapped_blocks structure.
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* If it doesn't fit any, nothing will happen.
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*
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* 3b) COW happens for NA
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* Check NA's bytenr against tree X's swapped_blocks, and get a hit.
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* Then we do subtree scan on both subtrees OA and NA.
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* Resulting 6 tree blocks to be scanned (OA, OC, OD, NA, NC, ND).
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*
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* Then no matter what we do to subvolume tree X, qgroup numbers will
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* still be correct.
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* Then NA's record gets removed from X's swapped_blocks.
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*
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* 4) Transaction commit
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* Any record in X's swapped_blocks gets removed, since there is no
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* modification to the swapped subtrees, no need to trigger heavy qgroup
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* subtree rescan for them.
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*/
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/*
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* These flags share the flags field of the btrfs_qgroup_status_item with the
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* persisted flags defined in btrfs_tree.h.
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*
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* To minimize the chance of collision with new persisted status flags, these
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* count backwards from the MSB.
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*/
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#define BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN (1ULL << 63)
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#define BTRFS_QGROUP_RUNTIME_FLAG_NO_ACCOUNTING (1ULL << 62)
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#define BTRFS_QGROUP_DROP_SUBTREE_THRES_DEFAULT (3)
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/*
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* Record a dirty extent, and info qgroup to update quota on it
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*/
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struct btrfs_qgroup_extent_record {
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u64 bytenr;
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u64 num_bytes;
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/*
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* For qgroup reserved data space freeing.
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*
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* @data_rsv_refroot and @data_rsv will be recorded after
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* BTRFS_ADD_DELAYED_EXTENT is called.
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* And will be used to free reserved qgroup space at
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* transaction commit time.
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*/
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u32 data_rsv; /* reserved data space needs to be freed */
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u64 data_rsv_refroot; /* which root the reserved data belongs to */
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struct ulist *old_roots;
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};
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struct btrfs_qgroup_swapped_block {
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struct rb_node node;
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int level;
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bool trace_leaf;
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/* bytenr/generation of the tree block in subvolume tree after swap */
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u64 subvol_bytenr;
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u64 subvol_generation;
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/* bytenr/generation of the tree block in reloc tree after swap */
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u64 reloc_bytenr;
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u64 reloc_generation;
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u64 last_snapshot;
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struct btrfs_key first_key;
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};
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/*
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* Qgroup reservation types:
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*
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* DATA:
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* space reserved for data
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*
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* META_PERTRANS:
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* Space reserved for metadata (per-transaction)
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* Due to the fact that qgroup data is only updated at transaction commit
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* time, reserved space for metadata must be kept until transaction
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* commits.
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* Any metadata reserved that are used in btrfs_start_transaction() should
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* be of this type.
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*
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* META_PREALLOC:
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* There are cases where metadata space is reserved before starting
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* transaction, and then btrfs_join_transaction() to get a trans handle.
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* Any metadata reserved for such usage should be of this type.
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* And after join_transaction() part (or all) of such reservation should
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* be converted into META_PERTRANS.
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*/
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enum btrfs_qgroup_rsv_type {
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BTRFS_QGROUP_RSV_DATA,
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BTRFS_QGROUP_RSV_META_PERTRANS,
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BTRFS_QGROUP_RSV_META_PREALLOC,
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BTRFS_QGROUP_RSV_LAST,
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};
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/*
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* Represents how many bytes we have reserved for this qgroup.
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*
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* Each type should have different reservation behavior.
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* E.g, data follows its io_tree flag modification, while
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* *currently* meta is just reserve-and-clear during transaction.
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*
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* TODO: Add new type for reservation which can survive transaction commit.
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* Current metadata reservation behavior is not suitable for such case.
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*/
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struct btrfs_qgroup_rsv {
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u64 values[BTRFS_QGROUP_RSV_LAST];
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};
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/*
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* one struct for each qgroup, organized in fs_info->qgroup_tree.
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*/
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struct btrfs_qgroup {
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u64 qgroupid;
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/*
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* state
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*/
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u64 rfer; /* referenced */
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u64 rfer_cmpr; /* referenced compressed */
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u64 excl; /* exclusive */
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u64 excl_cmpr; /* exclusive compressed */
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/*
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* limits
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*/
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u64 lim_flags; /* which limits are set */
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u64 max_rfer;
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u64 max_excl;
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u64 rsv_rfer;
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u64 rsv_excl;
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/*
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* reservation tracking
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*/
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struct btrfs_qgroup_rsv rsv;
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/*
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* lists
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*/
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struct list_head groups; /* groups this group is member of */
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struct list_head members; /* groups that are members of this group */
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struct list_head dirty; /* dirty groups */
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/*
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* For qgroup iteration usage.
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*
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* The iteration list should always be empty until qgroup_iterator_add()
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* is called. And should be reset to empty after the iteration is
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* finished.
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*/
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struct list_head iterator;
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/*
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* For nested iterator usage.
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*
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* Here we support at most one level of nested iterator calls like:
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*
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* LIST_HEAD(all_qgroups);
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* {
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* LIST_HEAD(local_qgroups);
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* qgroup_iterator_add(local_qgroups, qg);
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* qgroup_iterator_nested_add(all_qgroups, qg);
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* do_some_work(local_qgroups);
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* qgroup_iterator_clean(local_qgroups);
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* }
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* do_some_work(all_qgroups);
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* qgroup_iterator_nested_clean(all_qgroups);
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*/
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struct list_head nested_iterator;
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struct rb_node node; /* tree of qgroups */
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/*
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* temp variables for accounting operations
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* Refer to qgroup_shared_accounting() for details.
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*/
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u64 old_refcnt;
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u64 new_refcnt;
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/*
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* Sysfs kobjectid
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*/
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struct kobject kobj;
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};
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/* Glue structure to represent the relations between qgroups. */
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struct btrfs_qgroup_list {
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struct list_head next_group;
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struct list_head next_member;
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struct btrfs_qgroup *group;
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struct btrfs_qgroup *member;
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};
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struct btrfs_squota_delta {
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/* The fstree root this delta counts against. */
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u64 root;
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/* The number of bytes in the extent being counted. */
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u64 num_bytes;
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/* The generation the extent was created in. */
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u64 generation;
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/* Whether we are using or freeing the extent. */
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bool is_inc;
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/* Whether the extent is data or metadata. */
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bool is_data;
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};
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static inline u64 btrfs_qgroup_subvolid(u64 qgroupid)
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{
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return (qgroupid & ((1ULL << BTRFS_QGROUP_LEVEL_SHIFT) - 1));
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}
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/*
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* For qgroup event trace points only
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*/
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enum {
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ENUM_BIT(QGROUP_RESERVE),
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ENUM_BIT(QGROUP_RELEASE),
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ENUM_BIT(QGROUP_FREE),
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};
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enum btrfs_qgroup_mode {
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BTRFS_QGROUP_MODE_DISABLED,
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BTRFS_QGROUP_MODE_FULL,
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BTRFS_QGROUP_MODE_SIMPLE
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};
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enum btrfs_qgroup_mode btrfs_qgroup_mode(const struct btrfs_fs_info *fs_info);
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bool btrfs_qgroup_enabled(const struct btrfs_fs_info *fs_info);
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bool btrfs_qgroup_full_accounting(const struct btrfs_fs_info *fs_info);
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int btrfs_quota_enable(struct btrfs_fs_info *fs_info,
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struct btrfs_ioctl_quota_ctl_args *quota_ctl_args);
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int btrfs_quota_disable(struct btrfs_fs_info *fs_info);
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int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);
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void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info);
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int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info,
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bool interruptible);
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int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, u64 src, u64 dst,
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struct btrfs_qgroup_list *prealloc);
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int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
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u64 dst);
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int btrfs_create_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid);
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int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid);
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int btrfs_qgroup_cleanup_dropped_subvolume(struct btrfs_fs_info *fs_info, u64 subvolid);
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int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid,
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struct btrfs_qgroup_limit *limit);
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int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
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void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
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int btrfs_qgroup_trace_extent_nolock(
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struct btrfs_fs_info *fs_info,
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struct btrfs_delayed_ref_root *delayed_refs,
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struct btrfs_qgroup_extent_record *record);
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int btrfs_qgroup_trace_extent_post(struct btrfs_trans_handle *trans,
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struct btrfs_qgroup_extent_record *qrecord);
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int btrfs_qgroup_trace_extent(struct btrfs_trans_handle *trans, u64 bytenr,
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u64 num_bytes);
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int btrfs_qgroup_trace_leaf_items(struct btrfs_trans_handle *trans,
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struct extent_buffer *eb);
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int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
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struct extent_buffer *root_eb,
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u64 root_gen, int root_level);
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int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr,
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u64 num_bytes, struct ulist *old_roots,
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struct ulist *new_roots);
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int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans);
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int btrfs_run_qgroups(struct btrfs_trans_handle *trans);
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int btrfs_qgroup_check_inherit(struct btrfs_fs_info *fs_info,
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struct btrfs_qgroup_inherit *inherit,
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size_t size);
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int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid,
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u64 objectid, u64 inode_rootid,
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struct btrfs_qgroup_inherit *inherit);
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void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
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u64 ref_root, u64 num_bytes,
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enum btrfs_qgroup_rsv_type type);
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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int btrfs_verify_qgroup_counts(const struct btrfs_fs_info *fs_info, u64 qgroupid,
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u64 rfer, u64 excl);
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#endif
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/* New io_tree based accurate qgroup reserve API */
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int btrfs_qgroup_reserve_data(struct btrfs_inode *inode,
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struct extent_changeset **reserved, u64 start, u64 len);
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int btrfs_qgroup_release_data(struct btrfs_inode *inode, u64 start, u64 len, u64 *released);
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int btrfs_qgroup_free_data(struct btrfs_inode *inode,
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struct extent_changeset *reserved, u64 start,
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u64 len, u64 *freed);
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int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
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enum btrfs_qgroup_rsv_type type, bool enforce);
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int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
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enum btrfs_qgroup_rsv_type type, bool enforce,
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bool noflush);
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/* Reserve metadata space for pertrans and prealloc type */
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static inline int btrfs_qgroup_reserve_meta_pertrans(struct btrfs_root *root,
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int num_bytes, bool enforce)
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{
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return __btrfs_qgroup_reserve_meta(root, num_bytes,
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BTRFS_QGROUP_RSV_META_PERTRANS,
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enforce, false);
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}
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static inline int btrfs_qgroup_reserve_meta_prealloc(struct btrfs_root *root,
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int num_bytes, bool enforce,
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bool noflush)
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{
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return __btrfs_qgroup_reserve_meta(root, num_bytes,
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BTRFS_QGROUP_RSV_META_PREALLOC,
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enforce, noflush);
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}
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void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes,
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enum btrfs_qgroup_rsv_type type);
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/* Free per-transaction meta reservation for error handling */
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static inline void btrfs_qgroup_free_meta_pertrans(struct btrfs_root *root,
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int num_bytes)
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{
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__btrfs_qgroup_free_meta(root, num_bytes,
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BTRFS_QGROUP_RSV_META_PERTRANS);
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}
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/* Pre-allocated meta reservation can be freed at need */
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static inline void btrfs_qgroup_free_meta_prealloc(struct btrfs_root *root,
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int num_bytes)
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{
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__btrfs_qgroup_free_meta(root, num_bytes,
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BTRFS_QGROUP_RSV_META_PREALLOC);
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}
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void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root);
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void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes);
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void btrfs_qgroup_check_reserved_leak(struct btrfs_inode *inode);
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/* btrfs_qgroup_swapped_blocks related functions */
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void btrfs_qgroup_init_swapped_blocks(
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struct btrfs_qgroup_swapped_blocks *swapped_blocks);
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void btrfs_qgroup_clean_swapped_blocks(struct btrfs_root *root);
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int btrfs_qgroup_add_swapped_blocks(struct btrfs_trans_handle *trans,
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struct btrfs_root *subvol_root,
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struct btrfs_block_group *bg,
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struct extent_buffer *subvol_parent, int subvol_slot,
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struct extent_buffer *reloc_parent, int reloc_slot,
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u64 last_snapshot);
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int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, struct extent_buffer *eb);
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void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans);
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bool btrfs_check_quota_leak(const struct btrfs_fs_info *fs_info);
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void btrfs_free_squota_rsv(struct btrfs_fs_info *fs_info, u64 root, u64 rsv_bytes);
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int btrfs_record_squota_delta(struct btrfs_fs_info *fs_info,
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const struct btrfs_squota_delta *delta);
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#endif
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