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Mingming Cao8f6e39a2008-04-29 22:01:31 -04001/*
2 * fs/ext4/mballoc.h
3 *
4 * Written by: Alex Tomas <alex@clusterfs.com>
5 *
6 */
7#ifndef _EXT4_MBALLOC_H
8#define _EXT4_MBALLOC_H
9
10#include <linux/time.h>
11#include <linux/fs.h>
12#include <linux/namei.h>
13#include <linux/quotaops.h>
14#include <linux/buffer_head.h>
15#include <linux/module.h>
16#include <linux/swap.h>
17#include <linux/proc_fs.h>
18#include <linux/pagemap.h>
19#include <linux/seq_file.h>
Theodore Ts'o8a0aba72008-10-16 10:06:27 -040020#include <linux/blkdev.h>
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -050021#include <linux/mutex.h>
Mingming Cao8f6e39a2008-04-29 22:01:31 -040022#include "ext4_jbd2.h"
23#include "ext4.h"
Mingming Cao8f6e39a2008-04-29 22:01:31 -040024
25/*
Mingming Cao8f6e39a2008-04-29 22:01:31 -040026 */
Theodore Ts'o6ba495e2009-09-18 13:38:55 -040027#ifdef CONFIG_EXT4_DEBUG
Theodore Ts'oa0b30c12013-02-09 16:28:20 -050028extern ushort ext4_mballoc_debug;
Theodore Ts'o6ba495e2009-09-18 13:38:55 -040029
Joe Perchesd74f3d22016-10-15 09:57:31 -040030#define mb_debug(n, fmt, ...) \
31do { \
32 if ((n) <= ext4_mballoc_debug) { \
33 printk(KERN_DEBUG "(%s, %d): %s: " fmt, \
34 __FILE__, __LINE__, __func__, ##__VA_ARGS__); \
35 } \
36} while (0)
Mingming Cao8f6e39a2008-04-29 22:01:31 -040037#else
Joe Perchesd74f3d22016-10-15 09:57:31 -040038#define mb_debug(n, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
Mingming Cao8f6e39a2008-04-29 22:01:31 -040039#endif
40
Mingming Cao8f6e39a2008-04-29 22:01:31 -040041#define EXT4_MB_HISTORY_ALLOC 1 /* allocation */
42#define EXT4_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */
Mingming Cao8f6e39a2008-04-29 22:01:31 -040043
44/*
45 * How long mballoc can look for a best extent (in found extents)
46 */
47#define MB_DEFAULT_MAX_TO_SCAN 200
48
49/*
50 * How long mballoc must look for a best extent
51 */
52#define MB_DEFAULT_MIN_TO_SCAN 10
53
54/*
Mingming Cao8f6e39a2008-04-29 22:01:31 -040055 * with 'ext4_mb_stats' allocator will collect stats that will be
56 * shown at umount. The collecting costs though!
57 */
Theodore Ts'o90576c02009-09-29 15:51:30 -040058#define MB_DEFAULT_STATS 0
Mingming Cao8f6e39a2008-04-29 22:01:31 -040059
60/*
61 * files smaller than MB_DEFAULT_STREAM_THRESHOLD are served
62 * by the stream allocator, which purpose is to pack requests
63 * as close each to other as possible to produce smooth I/O traffic
64 * We use locality group prealloc space for stream request.
65 * We can tune the same via /proc/fs/ext4/<parition>/stream_req
66 */
67#define MB_DEFAULT_STREAM_THRESHOLD 16 /* 64K */
68
69/*
70 * for which requests use 2^N search using buddies
71 */
72#define MB_DEFAULT_ORDER2_REQS 2
73
74/*
75 * default group prealloc size 512 blocks
76 */
77#define MB_DEFAULT_GROUP_PREALLOC 512
78
Mingming Cao8f6e39a2008-04-29 22:01:31 -040079
Aneesh Kumar K.Vc8940582008-10-16 10:14:27 -040080struct ext4_free_data {
Bobi Jam18aadd42012-02-20 17:53:02 -050081 /* MUST be the first member */
82 struct ext4_journal_cb_entry efd_jce;
Mingming Cao8f6e39a2008-04-29 22:01:31 -040083
Bobi Jam18aadd42012-02-20 17:53:02 -050084 /* ext4_free_data private data starts from here */
85
86 /* this links the free block information from group_info */
87 struct rb_node efd_node;
Aneesh Kumar K.Vc8940582008-10-16 10:14:27 -040088
89 /* group which free block extent belongs */
Bobi Jam18aadd42012-02-20 17:53:02 -050090 ext4_group_t efd_group;
Aneesh Kumar K.Vc8940582008-10-16 10:14:27 -040091
92 /* free block extent */
Bobi Jam18aadd42012-02-20 17:53:02 -050093 ext4_grpblk_t efd_start_cluster;
94 ext4_grpblk_t efd_count;
Aneesh Kumar K.Vc8940582008-10-16 10:14:27 -040095
96 /* transaction which freed this extent */
Bobi Jam18aadd42012-02-20 17:53:02 -050097 tid_t efd_tid;
Mingming Cao8f6e39a2008-04-29 22:01:31 -040098};
99
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400100struct ext4_prealloc_space {
101 struct list_head pa_inode_list;
102 struct list_head pa_group_list;
103 union {
104 struct list_head pa_tmp_list;
105 struct rcu_head pa_rcu;
106 } u;
107 spinlock_t pa_lock;
108 atomic_t pa_count;
109 unsigned pa_deleted;
110 ext4_fsblk_t pa_pstart; /* phys. block */
111 ext4_lblk_t pa_lstart; /* log. block */
Eric Sandeena36b4492009-08-25 22:36:45 -0400112 ext4_grpblk_t pa_len; /* len of preallocated chunk */
113 ext4_grpblk_t pa_free; /* how many blocks are free */
Aneesh Kumar K.Vcc0fb9a2009-03-27 17:16:58 -0400114 unsigned short pa_type; /* pa type. inode or group */
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400115 spinlock_t *pa_obj_lock;
116 struct inode *pa_inode; /* hack, for history only */
117};
118
Aneesh Kumar K.Vcc0fb9a2009-03-27 17:16:58 -0400119enum {
120 MB_INODE_PA = 0,
121 MB_GROUP_PA = 1
122};
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400123
124struct ext4_free_extent {
125 ext4_lblk_t fe_logical;
Theodore Ts'o53accfa2011-09-09 18:48:51 -0400126 ext4_grpblk_t fe_start; /* In cluster units */
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400127 ext4_group_t fe_group;
Theodore Ts'o53accfa2011-09-09 18:48:51 -0400128 ext4_grpblk_t fe_len; /* In cluster units */
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400129};
130
131/*
132 * Locality group:
133 * we try to group all related changes together
134 * so that writeback can flush/allocate them together as well
Aneesh Kumar K.V6be2ded2008-07-23 14:14:05 -0400135 * Size of lg_prealloc_list hash is determined by MB_DEFAULT_GROUP_PREALLOC
136 * (512). We store prealloc space into the hash based on the pa_free blocks
137 * order value.ie, fls(pa_free)-1;
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400138 */
Aneesh Kumar K.V6be2ded2008-07-23 14:14:05 -0400139#define PREALLOC_TB_SIZE 10
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400140struct ext4_locality_group {
141 /* for allocator */
Aneesh Kumar K.V6be2ded2008-07-23 14:14:05 -0400142 /* to serialize allocates */
143 struct mutex lg_mutex;
144 /* list of preallocations */
145 struct list_head lg_prealloc_list[PREALLOC_TB_SIZE];
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400146 spinlock_t lg_prealloc_lock;
147};
148
149struct ext4_allocation_context {
150 struct inode *ac_inode;
151 struct super_block *ac_sb;
152
153 /* original request */
154 struct ext4_free_extent ac_o_ex;
155
Coly Li58696f32011-02-24 14:10:00 -0500156 /* goal request (normalized ac_o_ex) */
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400157 struct ext4_free_extent ac_g_ex;
158
159 /* the best found extent */
160 struct ext4_free_extent ac_b_ex;
161
Robin Dongff3fc172011-10-31 18:55:50 -0400162 /* copy of the best found extent taken before preallocation efforts */
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400163 struct ext4_free_extent ac_f_ex;
164
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400165 __u16 ac_groups_scanned;
166 __u16 ac_found;
167 __u16 ac_tail;
168 __u16 ac_buddy;
169 __u16 ac_flags; /* allocation hints */
170 __u8 ac_status;
171 __u8 ac_criteria;
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400172 __u8 ac_2order; /* if request is to allocate 2^N blocks and
173 * N > 0, the field stores N, otherwise 0 */
174 __u8 ac_op; /* operation, for history only */
175 struct page *ac_bitmap_page;
176 struct page *ac_buddy_page;
177 struct ext4_prealloc_space *ac_pa;
178 struct ext4_locality_group *ac_lg;
179};
180
181#define AC_STATUS_CONTINUE 1
182#define AC_STATUS_FOUND 2
183#define AC_STATUS_BREAK 3
184
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400185struct ext4_buddy {
186 struct page *bd_buddy_page;
187 void *bd_buddy;
188 struct page *bd_bitmap_page;
189 void *bd_bitmap;
190 struct ext4_group_info *bd_info;
191 struct super_block *bd_sb;
192 __u16 bd_blkbits;
193 ext4_group_t bd_group;
194};
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400195
Aneesh Kumar K.Vc3a326a2008-11-25 15:11:52 -0500196static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400197 struct ext4_free_extent *fex)
198{
Theodore Ts'o3212a802011-09-09 18:46:51 -0400199 return ext4_group_first_block_no(sb, fex->fe_group) +
200 (fex->fe_start << EXT4_SB(sb)->s_cluster_bits);
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400201}
Darrick J. Wong0c9ec4b2017-04-30 00:36:53 -0400202
203typedef int (*ext4_mballoc_query_range_fn)(
204 struct super_block *sb,
205 ext4_group_t agno,
206 ext4_grpblk_t start,
207 ext4_grpblk_t len,
208 void *priv);
209
210int
211ext4_mballoc_query_range(
212 struct super_block *sb,
213 ext4_group_t agno,
214 ext4_grpblk_t start,
215 ext4_grpblk_t end,
216 ext4_mballoc_query_range_fn formatter,
217 void *priv);
218
Mingming Cao8f6e39a2008-04-29 22:01:31 -0400219#endif