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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * fs/ext4/mballoc.h
4 *
5 * Written by: Alex Tomas <alex@clusterfs.com>
6 *
7 */
8#ifndef _EXT4_MBALLOC_H
9#define _EXT4_MBALLOC_H
10
11#include <linux/time.h>
12#include <linux/fs.h>
13#include <linux/namei.h>
14#include <linux/quotaops.h>
15#include <linux/buffer_head.h>
16#include <linux/module.h>
17#include <linux/swap.h>
18#include <linux/proc_fs.h>
19#include <linux/pagemap.h>
20#include <linux/seq_file.h>
21#include <linux/blkdev.h>
22#include <linux/mutex.h>
23#include "ext4_jbd2.h"
24#include "ext4.h"
25
26/*
27 */
28#ifdef CONFIG_EXT4_DEBUG
29extern ushort ext4_mballoc_debug;
30
31#define mb_debug(n, fmt, ...) \
32do { \
33 if ((n) <= ext4_mballoc_debug) { \
34 printk(KERN_DEBUG "(%s, %d): %s: " fmt, \
35 __FILE__, __LINE__, __func__, ##__VA_ARGS__); \
36 } \
37} while (0)
38#else
39#define mb_debug(n, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
40#endif
41
42#define EXT4_MB_HISTORY_ALLOC 1 /* allocation */
43#define EXT4_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */
44
45/*
46 * How long mballoc can look for a best extent (in found extents)
47 */
48#define MB_DEFAULT_MAX_TO_SCAN 200
49
50/*
51 * How long mballoc must look for a best extent
52 */
53#define MB_DEFAULT_MIN_TO_SCAN 10
54
55/*
56 * with 'ext4_mb_stats' allocator will collect stats that will be
57 * shown at umount. The collecting costs though!
58 */
59#define MB_DEFAULT_STATS 0
60
61/*
62 * files smaller than MB_DEFAULT_STREAM_THRESHOLD are served
63 * by the stream allocator, which purpose is to pack requests
64 * as close each to other as possible to produce smooth I/O traffic
65 * We use locality group prealloc space for stream request.
66 * We can tune the same via /proc/fs/ext4/<parition>/stream_req
67 */
68#define MB_DEFAULT_STREAM_THRESHOLD 16 /* 64K */
69
70/*
71 * for which requests use 2^N search using buddies
72 */
73#define MB_DEFAULT_ORDER2_REQS 2
74
75/*
76 * default group prealloc size 512 blocks
77 */
78#define MB_DEFAULT_GROUP_PREALLOC 512
79
80
81struct ext4_free_data {
82 /* this links the free block information from sb_info */
83 struct list_head efd_list;
84
85 /* this links the free block information from group_info */
86 struct rb_node efd_node;
87
88 /* group which free block extent belongs */
89 ext4_group_t efd_group;
90
91 /* free block extent */
92 ext4_grpblk_t efd_start_cluster;
93 ext4_grpblk_t efd_count;
94
95 /* transaction which freed this extent */
96 tid_t efd_tid;
97};
98
99struct ext4_prealloc_space {
100 struct list_head pa_inode_list;
101 struct list_head pa_group_list;
102 union {
103 struct list_head pa_tmp_list;
104 struct rcu_head pa_rcu;
105 } u;
106 spinlock_t pa_lock;
107 atomic_t pa_count;
108 unsigned pa_deleted;
109 ext4_fsblk_t pa_pstart; /* phys. block */
110 ext4_lblk_t pa_lstart; /* log. block */
111 ext4_grpblk_t pa_len; /* len of preallocated chunk */
112 ext4_grpblk_t pa_free; /* how many blocks are free */
113 unsigned short pa_type; /* pa type. inode or group */
114 spinlock_t *pa_obj_lock;
115 struct inode *pa_inode; /* hack, for history only */
116};
117
118enum {
119 MB_INODE_PA = 0,
120 MB_GROUP_PA = 1
121};
122
123struct ext4_free_extent {
124 ext4_lblk_t fe_logical;
125 ext4_grpblk_t fe_start; /* In cluster units */
126 ext4_group_t fe_group;
127 ext4_grpblk_t fe_len; /* In cluster units */
128};
129
130/*
131 * Locality group:
132 * we try to group all related changes together
133 * so that writeback can flush/allocate them together as well
134 * Size of lg_prealloc_list hash is determined by MB_DEFAULT_GROUP_PREALLOC
135 * (512). We store prealloc space into the hash based on the pa_free blocks
136 * order value.ie, fls(pa_free)-1;
137 */
138#define PREALLOC_TB_SIZE 10
139struct ext4_locality_group {
140 /* for allocator */
141 /* to serialize allocates */
142 struct mutex lg_mutex;
143 /* list of preallocations */
144 struct list_head lg_prealloc_list[PREALLOC_TB_SIZE];
145 spinlock_t lg_prealloc_lock;
146};
147
148struct ext4_allocation_context {
149 struct inode *ac_inode;
150 struct super_block *ac_sb;
151
152 /* original request */
153 struct ext4_free_extent ac_o_ex;
154
155 /* goal request (normalized ac_o_ex) */
156 struct ext4_free_extent ac_g_ex;
157
158 /* the best found extent */
159 struct ext4_free_extent ac_b_ex;
160
161 /* copy of the best found extent taken before preallocation efforts */
162 struct ext4_free_extent ac_f_ex;
163
164 __u16 ac_groups_scanned;
165 __u16 ac_found;
166 __u16 ac_tail;
167 __u16 ac_buddy;
168 __u16 ac_flags; /* allocation hints */
169 __u8 ac_status;
170 __u8 ac_criteria;
171 __u8 ac_2order; /* if request is to allocate 2^N blocks and
172 * N > 0, the field stores N, otherwise 0 */
173 __u8 ac_op; /* operation, for history only */
174 struct page *ac_bitmap_page;
175 struct page *ac_buddy_page;
176 struct ext4_prealloc_space *ac_pa;
177 struct ext4_locality_group *ac_lg;
178};
179
180#define AC_STATUS_CONTINUE 1
181#define AC_STATUS_FOUND 2
182#define AC_STATUS_BREAK 3
183
184struct ext4_buddy {
185 struct page *bd_buddy_page;
186 void *bd_buddy;
187 struct page *bd_bitmap_page;
188 void *bd_bitmap;
189 struct ext4_group_info *bd_info;
190 struct super_block *bd_sb;
191 __u16 bd_blkbits;
192 ext4_group_t bd_group;
193};
194
195static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
196 struct ext4_free_extent *fex)
197{
198 return ext4_group_first_block_no(sb, fex->fe_group) +
199 (fex->fe_start << EXT4_SB(sb)->s_cluster_bits);
200}
201
202typedef int (*ext4_mballoc_query_range_fn)(
203 struct super_block *sb,
204 ext4_group_t agno,
205 ext4_grpblk_t start,
206 ext4_grpblk_t len,
207 void *priv);
208
209int
210ext4_mballoc_query_range(
211 struct super_block *sb,
212 ext4_group_t agno,
213 ext4_grpblk_t start,
214 ext4_grpblk_t end,
215 ext4_mballoc_query_range_fn formatter,
216 void *priv);
217
218#endif
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * fs/ext4/mballoc.h
4 *
5 * Written by: Alex Tomas <alex@clusterfs.com>
6 *
7 */
8#ifndef _EXT4_MBALLOC_H
9#define _EXT4_MBALLOC_H
10
11#include <linux/time.h>
12#include <linux/fs.h>
13#include <linux/namei.h>
14#include <linux/quotaops.h>
15#include <linux/buffer_head.h>
16#include <linux/module.h>
17#include <linux/swap.h>
18#include <linux/proc_fs.h>
19#include <linux/pagemap.h>
20#include <linux/seq_file.h>
21#include <linux/blkdev.h>
22#include <linux/mutex.h>
23#include "ext4_jbd2.h"
24#include "ext4.h"
25
26/*
27 * mb_debug() dynamic printk msgs could be used to debug mballoc code.
28 */
29#ifdef CONFIG_EXT4_DEBUG
30#define mb_debug(sb, fmt, ...) \
31 pr_debug("[%s/%d] EXT4-fs (%s): (%s, %d): %s: " fmt, \
32 current->comm, task_pid_nr(current), sb->s_id, \
33 __FILE__, __LINE__, __func__, ##__VA_ARGS__)
34#else
35#define mb_debug(sb, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
36#endif
37
38#define EXT4_MB_HISTORY_ALLOC 1 /* allocation */
39#define EXT4_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */
40
41/*
42 * How long mballoc can look for a best extent (in found extents)
43 */
44#define MB_DEFAULT_MAX_TO_SCAN 200
45
46/*
47 * How long mballoc must look for a best extent
48 */
49#define MB_DEFAULT_MIN_TO_SCAN 10
50
51/*
52 * with 'ext4_mb_stats' allocator will collect stats that will be
53 * shown at umount. The collecting costs though!
54 */
55#define MB_DEFAULT_STATS 0
56
57/*
58 * files smaller than MB_DEFAULT_STREAM_THRESHOLD are served
59 * by the stream allocator, which purpose is to pack requests
60 * as close each to other as possible to produce smooth I/O traffic
61 * We use locality group prealloc space for stream request.
62 * We can tune the same via /proc/fs/ext4/<partition>/stream_req
63 */
64#define MB_DEFAULT_STREAM_THRESHOLD 16 /* 64K */
65
66/*
67 * for which requests use 2^N search using buddies
68 */
69#define MB_DEFAULT_ORDER2_REQS 2
70
71/*
72 * default group prealloc size 512 blocks
73 */
74#define MB_DEFAULT_GROUP_PREALLOC 512
75
76/*
77 * maximum length of inode prealloc list
78 */
79#define MB_DEFAULT_MAX_INODE_PREALLOC 512
80
81/*
82 * Number of groups to search linearly before performing group scanning
83 * optimization.
84 */
85#define MB_DEFAULT_LINEAR_LIMIT 4
86
87/*
88 * Minimum number of groups that should be present in the file system to perform
89 * group scanning optimizations.
90 */
91#define MB_DEFAULT_LINEAR_SCAN_THRESHOLD 16
92
93/*
94 * Number of valid buddy orders
95 */
96#define MB_NUM_ORDERS(sb) ((sb)->s_blocksize_bits + 2)
97
98struct ext4_free_data {
99 /* this links the free block information from sb_info */
100 struct list_head efd_list;
101
102 /* this links the free block information from group_info */
103 struct rb_node efd_node;
104
105 /* group which free block extent belongs */
106 ext4_group_t efd_group;
107
108 /* free block extent */
109 ext4_grpblk_t efd_start_cluster;
110 ext4_grpblk_t efd_count;
111
112 /* transaction which freed this extent */
113 tid_t efd_tid;
114};
115
116struct ext4_prealloc_space {
117 struct list_head pa_inode_list;
118 struct list_head pa_group_list;
119 union {
120 struct list_head pa_tmp_list;
121 struct rcu_head pa_rcu;
122 } u;
123 spinlock_t pa_lock;
124 atomic_t pa_count;
125 unsigned pa_deleted;
126 ext4_fsblk_t pa_pstart; /* phys. block */
127 ext4_lblk_t pa_lstart; /* log. block */
128 ext4_grpblk_t pa_len; /* len of preallocated chunk */
129 ext4_grpblk_t pa_free; /* how many blocks are free */
130 unsigned short pa_type; /* pa type. inode or group */
131 spinlock_t *pa_obj_lock;
132 struct inode *pa_inode; /* hack, for history only */
133};
134
135enum {
136 MB_INODE_PA = 0,
137 MB_GROUP_PA = 1
138};
139
140struct ext4_free_extent {
141 ext4_lblk_t fe_logical;
142 ext4_grpblk_t fe_start; /* In cluster units */
143 ext4_group_t fe_group;
144 ext4_grpblk_t fe_len; /* In cluster units */
145};
146
147/*
148 * Locality group:
149 * we try to group all related changes together
150 * so that writeback can flush/allocate them together as well
151 * Size of lg_prealloc_list hash is determined by MB_DEFAULT_GROUP_PREALLOC
152 * (512). We store prealloc space into the hash based on the pa_free blocks
153 * order value.ie, fls(pa_free)-1;
154 */
155#define PREALLOC_TB_SIZE 10
156struct ext4_locality_group {
157 /* for allocator */
158 /* to serialize allocates */
159 struct mutex lg_mutex;
160 /* list of preallocations */
161 struct list_head lg_prealloc_list[PREALLOC_TB_SIZE];
162 spinlock_t lg_prealloc_lock;
163};
164
165struct ext4_allocation_context {
166 struct inode *ac_inode;
167 struct super_block *ac_sb;
168
169 /* original request */
170 struct ext4_free_extent ac_o_ex;
171
172 /* goal request (normalized ac_o_ex) */
173 struct ext4_free_extent ac_g_ex;
174
175 /* the best found extent */
176 struct ext4_free_extent ac_b_ex;
177
178 /* copy of the best found extent taken before preallocation efforts */
179 struct ext4_free_extent ac_f_ex;
180
181 __u32 ac_groups_considered;
182 __u32 ac_flags; /* allocation hints */
183 __u16 ac_groups_scanned;
184 __u16 ac_groups_linear_remaining;
185 __u16 ac_found;
186 __u16 ac_tail;
187 __u16 ac_buddy;
188 __u8 ac_status;
189 __u8 ac_criteria;
190 __u8 ac_2order; /* if request is to allocate 2^N blocks and
191 * N > 0, the field stores N, otherwise 0 */
192 __u8 ac_op; /* operation, for history only */
193 struct page *ac_bitmap_page;
194 struct page *ac_buddy_page;
195 struct ext4_prealloc_space *ac_pa;
196 struct ext4_locality_group *ac_lg;
197};
198
199#define AC_STATUS_CONTINUE 1
200#define AC_STATUS_FOUND 2
201#define AC_STATUS_BREAK 3
202
203struct ext4_buddy {
204 struct page *bd_buddy_page;
205 void *bd_buddy;
206 struct page *bd_bitmap_page;
207 void *bd_bitmap;
208 struct ext4_group_info *bd_info;
209 struct super_block *bd_sb;
210 __u16 bd_blkbits;
211 ext4_group_t bd_group;
212};
213
214static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
215 struct ext4_free_extent *fex)
216{
217 return ext4_group_first_block_no(sb, fex->fe_group) +
218 (fex->fe_start << EXT4_SB(sb)->s_cluster_bits);
219}
220
221typedef int (*ext4_mballoc_query_range_fn)(
222 struct super_block *sb,
223 ext4_group_t agno,
224 ext4_grpblk_t start,
225 ext4_grpblk_t len,
226 void *priv);
227
228int
229ext4_mballoc_query_range(
230 struct super_block *sb,
231 ext4_group_t agno,
232 ext4_grpblk_t start,
233 ext4_grpblk_t end,
234 ext4_mballoc_query_range_fn formatter,
235 void *priv);
236
237#endif