2 * Copyright (C) 2014 Facebook. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #ifndef __BTRFS_QGROUP__
20 #define __BTRFS_QGROUP__
23 #include "delayed-ref.h"
26 * Btrfs qgroup overview
28 * Btrfs qgroup splits into 3 main part:
30 * Reserve metadata/data space for incoming operations
31 * Affect how qgroup limit works
34 * Tell btrfs qgroup to trace dirty extents.
36 * Dirty extents including:
37 * - Newly allocated extents
38 * - Extents going to be deleted (in this trans)
39 * - Extents whose owner is going to be modified
41 * This is the main part affects whether qgroup numbers will stay
43 * Btrfs qgroup can trace clean extents and won't cause any problem,
44 * but it will consume extra CPU time, it should be avoided if possible.
47 * Btrfs qgroup will updates its numbers, based on dirty extents traced
50 * Normally at qgroup rescan and transaction commit time.
54 * Record a dirty extent, and info qgroup to update quota on it
55 * TODO: Use kmem cache to alloc it.
57 struct btrfs_qgroup_extent_record {
61 struct ulist *old_roots;
65 * Qgroup reservation types:
68 * space reserved for data
71 * Space reserved for metadata (per-transaction)
72 * Due to the fact that qgroup data is only updated at transaction commit
73 * time, reserved space for metadata must be kept until transaction
75 * Any metadata reserved that are used in btrfs_start_transaction() should
79 * There are cases where metadata space is reserved before starting
80 * transaction, and then btrfs_join_transaction() to get a trans handle.
81 * Any metadata reserved for such usage should be of this type.
82 * And after join_transaction() part (or all) of such reservation should
83 * be converted into META_PERTRANS.
85 enum btrfs_qgroup_rsv_type {
86 BTRFS_QGROUP_RSV_DATA = 0,
87 BTRFS_QGROUP_RSV_META_PERTRANS,
88 BTRFS_QGROUP_RSV_META_PREALLOC,
89 BTRFS_QGROUP_RSV_LAST,
93 * Represents how many bytes we have reserved for this qgroup.
95 * Each type should have different reservation behavior.
96 * E.g, data follows its io_tree flag modification, while
97 * *currently* meta is just reserve-and-clear during transcation.
99 * TODO: Add new type for reservation which can survive transaction commit.
100 * Currect metadata reservation behavior is not suitable for such case.
102 struct btrfs_qgroup_rsv {
103 u64 values[BTRFS_QGROUP_RSV_LAST];
107 * one struct for each qgroup, organized in fs_info->qgroup_tree.
109 struct btrfs_qgroup {
115 u64 rfer; /* referenced */
116 u64 rfer_cmpr; /* referenced compressed */
117 u64 excl; /* exclusive */
118 u64 excl_cmpr; /* exclusive compressed */
123 u64 lim_flags; /* which limits are set */
130 * reservation tracking
132 struct btrfs_qgroup_rsv rsv;
137 struct list_head groups; /* groups this group is member of */
138 struct list_head members; /* groups that are members of this group */
139 struct list_head dirty; /* dirty groups */
140 struct rb_node node; /* tree of qgroups */
143 * temp variables for accounting operations
144 * Refer to qgroup_shared_accounting() for details.
151 * For qgroup event trace points only
153 #define QGROUP_RESERVE (1<<0)
154 #define QGROUP_RELEASE (1<<1)
155 #define QGROUP_FREE (1<<2)
157 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
158 struct btrfs_fs_info *fs_info);
159 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
160 struct btrfs_fs_info *fs_info);
161 int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);
162 void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info);
163 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info,
165 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
166 struct btrfs_fs_info *fs_info, u64 src, u64 dst);
167 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
168 struct btrfs_fs_info *fs_info, u64 src, u64 dst);
169 int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
170 struct btrfs_fs_info *fs_info, u64 qgroupid);
171 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
172 struct btrfs_fs_info *fs_info, u64 qgroupid);
173 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
174 struct btrfs_fs_info *fs_info, u64 qgroupid,
175 struct btrfs_qgroup_limit *limit);
176 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
177 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
178 struct btrfs_delayed_extent_op;
181 * Inform qgroup to trace one dirty extent, its info is recorded in @record.
182 * So qgroup can account it at transaction committing time.
184 * No lock version, caller must acquire delayed ref lock and allocated memory,
185 * then call btrfs_qgroup_trace_extent_post() after exiting lock context.
187 * Return 0 for success insert
188 * Return >0 for existing record, caller can free @record safely.
189 * Error is not possible
191 int btrfs_qgroup_trace_extent_nolock(
192 struct btrfs_fs_info *fs_info,
193 struct btrfs_delayed_ref_root *delayed_refs,
194 struct btrfs_qgroup_extent_record *record);
197 * Post handler after qgroup_trace_extent_nolock().
199 * NOTE: Current qgroup does the expensive backref walk at transaction
200 * committing time with TRANS_STATE_COMMIT_DOING, this blocks incoming
202 * This is designed to allow btrfs_find_all_roots() to get correct new_roots
205 * However for old_roots there is no need to do backref walk at that time,
206 * since we search commit roots to walk backref and result will always be
209 * Due to the nature of no lock version, we can't do backref there.
210 * So we must call btrfs_qgroup_trace_extent_post() after exiting
213 * TODO: If we can fix and prove btrfs_find_all_roots() can get correct result
214 * using current root, then we can move all expensive backref walk out of
215 * transaction committing, but not now as qgroup accounting will be wrong again.
217 int btrfs_qgroup_trace_extent_post(struct btrfs_fs_info *fs_info,
218 struct btrfs_qgroup_extent_record *qrecord);
221 * Inform qgroup to trace one dirty extent, specified by @bytenr and
223 * So qgroup can account it at commit trans time.
225 * Better encapsulated version, with memory allocation and backref walk for
229 * Return 0 if the operation is done.
230 * Return <0 for error, like memory allocation failure or invalid parameter
233 int btrfs_qgroup_trace_extent(struct btrfs_trans_handle *trans,
234 struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes,
238 * Inform qgroup to trace all leaf items of data
240 * Return 0 for success
241 * Return <0 for error(ENOMEM)
243 int btrfs_qgroup_trace_leaf_items(struct btrfs_trans_handle *trans,
244 struct btrfs_fs_info *fs_info,
245 struct extent_buffer *eb);
247 * Inform qgroup to trace a whole subtree, including all its child tree
249 * The root tree block is specified by @root_eb.
251 * Normally used by relocation(tree block swap) and subvolume deletion.
253 * Return 0 for success
254 * Return <0 for error(ENOMEM or tree search error)
256 int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
257 struct btrfs_root *root,
258 struct extent_buffer *root_eb,
259 u64 root_gen, int root_level);
261 btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
262 struct btrfs_fs_info *fs_info,
263 u64 bytenr, u64 num_bytes,
264 struct ulist *old_roots, struct ulist *new_roots);
265 int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans);
266 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
267 struct btrfs_fs_info *fs_info);
268 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
269 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
270 struct btrfs_qgroup_inherit *inherit);
271 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
272 u64 ref_root, u64 num_bytes,
273 enum btrfs_qgroup_rsv_type type);
274 static inline void btrfs_qgroup_free_delayed_ref(struct btrfs_fs_info *fs_info,
275 u64 ref_root, u64 num_bytes)
277 trace_btrfs_qgroup_free_delayed_ref(fs_info, ref_root, num_bytes);
278 btrfs_qgroup_free_refroot(fs_info, ref_root, num_bytes,
279 BTRFS_QGROUP_RSV_DATA);
282 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
283 int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
287 /* New io_tree based accurate qgroup reserve API */
288 int btrfs_qgroup_reserve_data(struct inode *inode,
289 struct extent_changeset **reserved, u64 start, u64 len);
290 int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len);
291 int btrfs_qgroup_free_data(struct inode *inode,
292 struct extent_changeset *reserved, u64 start, u64 len);
294 int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
295 enum btrfs_qgroup_rsv_type type, bool enforce);
296 /* Reserve metadata space for pertrans and prealloc type */
297 static inline int btrfs_qgroup_reserve_meta_pertrans(struct btrfs_root *root,
298 int num_bytes, bool enforce)
300 return __btrfs_qgroup_reserve_meta(root, num_bytes,
301 BTRFS_QGROUP_RSV_META_PERTRANS, enforce);
303 static inline int btrfs_qgroup_reserve_meta_prealloc(struct btrfs_root *root,
304 int num_bytes, bool enforce)
306 return __btrfs_qgroup_reserve_meta(root, num_bytes,
307 BTRFS_QGROUP_RSV_META_PREALLOC, enforce);
310 void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes,
311 enum btrfs_qgroup_rsv_type type);
313 /* Free per-transaction meta reservation for error handling */
314 static inline void btrfs_qgroup_free_meta_pertrans(struct btrfs_root *root,
317 __btrfs_qgroup_free_meta(root, num_bytes,
318 BTRFS_QGROUP_RSV_META_PERTRANS);
321 /* Pre-allocated meta reservation can be freed at need */
322 static inline void btrfs_qgroup_free_meta_prealloc(struct btrfs_root *root,
325 __btrfs_qgroup_free_meta(root, num_bytes,
326 BTRFS_QGROUP_RSV_META_PREALLOC);
330 * Per-transaction meta reservation should be all freed at transaction commit
333 void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root);
336 * Convert @num_bytes of META_PREALLOCATED reservation to META_PERTRANS.
338 * This is called when preallocated meta reservation needs to be used.
339 * Normally after btrfs_join_transaction() call.
341 void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes);
343 void btrfs_qgroup_check_reserved_leak(struct inode *inode);
344 #endif /* __BTRFS_QGROUP__ */