mirror of
https://github.com/torvalds/linux.git
synced 2024-11-27 14:41:39 +00:00
fb235dc06f
Just as Filipe pointed out, the most time consuming parts of qgroup are btrfs_qgroup_account_extents() and btrfs_qgroup_prepare_account_extents(). Which both call btrfs_find_all_roots() to get old_roots and new_roots ulist. What makes things worse is, we're calling that expensive btrfs_find_all_roots() at transaction committing time with TRANS_STATE_COMMIT_DOING, which will blocks all incoming transaction. Such behavior is necessary for @new_roots search as current btrfs_find_all_roots() can't do it correctly so we do call it just before switch commit roots. However for @old_roots search, it's not necessary as such search is based on commit_root, so it will always be correct and we can move it out of transaction committing. This patch moves the @old_roots search part out of commit_transaction(), so in theory we can half the time qgroup time consumption at commit_transaction(). But please note that, this won't speedup qgroup overall, the total time consumption is still the same, just reduce the performance stall. Cc: Filipe Manana <fdmanana@suse.com> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
217 lines
7.8 KiB
C
217 lines
7.8 KiB
C
/*
|
|
* Copyright (C) 2014 Facebook. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#ifndef __BTRFS_QGROUP__
|
|
#define __BTRFS_QGROUP__
|
|
|
|
#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;
|
|
};
|
|
|
|
/*
|
|
* 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_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info);
|
|
int btrfs_quota_disable(struct btrfs_trans_handle *trans,
|
|
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,
|
|
struct btrfs_fs_info *fs_info, u64 src, u64 dst);
|
|
int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 src, u64 dst);
|
|
int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 qgroupid);
|
|
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 qgroupid);
|
|
int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, 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;
|
|
int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info);
|
|
/*
|
|
* 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,
|
|
struct btrfs_fs_info *fs_info, 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 btrfs_fs_info *fs_info,
|
|
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 btrfs_root *root,
|
|
struct extent_buffer *root_eb,
|
|
u64 root_gen, int root_level);
|
|
int
|
|
btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 bytenr, u64 num_bytes,
|
|
struct ulist *old_roots, struct ulist *new_roots);
|
|
int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info);
|
|
int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info);
|
|
int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, 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);
|
|
/*
|
|
* TODO: Add proper trace point for it, as btrfs_qgroup_free() is
|
|
* called by everywhere, can't provide good trace for delayed ref case.
|
|
*/
|
|
static inline void btrfs_qgroup_free_delayed_ref(struct btrfs_fs_info *fs_info,
|
|
u64 ref_root, u64 num_bytes)
|
|
{
|
|
btrfs_qgroup_free_refroot(fs_info, ref_root, num_bytes);
|
|
trace_btrfs_qgroup_free_delayed_ref(fs_info, ref_root, num_bytes);
|
|
}
|
|
void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
|
|
|
|
#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, u64 start, u64 len);
|
|
int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len);
|
|
int btrfs_qgroup_free_data(struct inode *inode, u64 start, u64 len);
|
|
|
|
int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
|
|
bool enforce);
|
|
void btrfs_qgroup_free_meta_all(struct btrfs_root *root);
|
|
void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes);
|
|
void btrfs_qgroup_check_reserved_leak(struct inode *inode);
|
|
#endif /* __BTRFS_QGROUP__ */
|