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f5166768 | 1 | // SPDX-License-Identifier: GPL-2.0 |
8f6e39a7 MC |
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> | |
8a0aba73 | 21 | #include <linux/blkdev.h> |
920313a7 | 22 | #include <linux/mutex.h> |
8f6e39a7 MC |
23 | #include "ext4_jbd2.h" |
24 | #include "ext4.h" | |
8f6e39a7 | 25 | |
8f6e39a7 | 26 | /* |
d3df1453 | 27 | * mb_debug() dynamic printk msgs could be used to debug mballoc code. |
8f6e39a7 | 28 | */ |
6ba495e9 | 29 | #ifdef CONFIG_EXT4_DEBUG |
d3df1453 RH |
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__) | |
8f6e39a7 | 34 | #else |
d3df1453 | 35 | #define mb_debug(sb, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
8f6e39a7 MC |
36 | #endif |
37 | ||
8f6e39a7 MC |
38 | #define EXT4_MB_HISTORY_ALLOC 1 /* allocation */ |
39 | #define EXT4_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */ | |
8f6e39a7 MC |
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 | ||
8f6e39a7 | 51 | /* |
5730cce3 | 52 | * with 's_mb_stats' allocator will collect stats that will be |
8f6e39a7 MC |
53 | * shown at umount. The collecting costs though! |
54 | */ | |
90576c0b | 55 | #define MB_DEFAULT_STATS 0 |
8f6e39a7 MC |
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. | |
3088e5a5 | 62 | * We can tune the same via /proc/fs/ext4/<partition>/stream_req |
8f6e39a7 MC |
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 | ||
196e402a HS |
76 | /* |
77 | * Number of groups to search linearly before performing group scanning | |
78 | * optimization. | |
79 | */ | |
80 | #define MB_DEFAULT_LINEAR_LIMIT 4 | |
81 | ||
82 | /* | |
83 | * Minimum number of groups that should be present in the file system to perform | |
84 | * group scanning optimizations. | |
85 | */ | |
86 | #define MB_DEFAULT_LINEAR_SCAN_THRESHOLD 16 | |
87 | ||
7e170922 | 88 | /* |
f52f3d2b OM |
89 | * The maximum order upto which CR_BEST_AVAIL_LEN can trim a particular |
90 | * allocation request. Example, if we have an order 7 request and max trim order | |
91 | * of 3, we can trim this request upto order 4. | |
7e170922 | 92 | */ |
f52f3d2b | 93 | #define MB_DEFAULT_BEST_AVAIL_TRIM_ORDER 3 |
7e170922 | 94 | |
4b68f6df HS |
95 | /* |
96 | * Number of valid buddy orders | |
97 | */ | |
98 | #define MB_NUM_ORDERS(sb) ((sb)->s_blocksize_bits + 2) | |
99 | ||
c894058d | 100 | struct ext4_free_data { |
a0154344 DJ |
101 | /* this links the free block information from sb_info */ |
102 | struct list_head efd_list; | |
8f6e39a7 | 103 | |
18aadd47 BJ |
104 | /* this links the free block information from group_info */ |
105 | struct rb_node efd_node; | |
c894058d AK |
106 | |
107 | /* group which free block extent belongs */ | |
18aadd47 | 108 | ext4_group_t efd_group; |
c894058d AK |
109 | |
110 | /* free block extent */ | |
18aadd47 BJ |
111 | ext4_grpblk_t efd_start_cluster; |
112 | ext4_grpblk_t efd_count; | |
c894058d AK |
113 | |
114 | /* transaction which freed this extent */ | |
18aadd47 | 115 | tid_t efd_tid; |
8f6e39a7 MC |
116 | }; |
117 | ||
8f6e39a7 | 118 | struct ext4_prealloc_space { |
a8e38fd3 | 119 | union { |
38727786 | 120 | struct rb_node inode_node; /* for inode PA rbtree */ |
a8e38fd3 OM |
121 | struct list_head lg_list; /* for lg PAs */ |
122 | } pa_node; | |
8f6e39a7 MC |
123 | struct list_head pa_group_list; |
124 | union { | |
125 | struct list_head pa_tmp_list; | |
126 | struct rcu_head pa_rcu; | |
127 | } u; | |
128 | spinlock_t pa_lock; | |
129 | atomic_t pa_count; | |
130 | unsigned pa_deleted; | |
131 | ext4_fsblk_t pa_pstart; /* phys. block */ | |
132 | ext4_lblk_t pa_lstart; /* log. block */ | |
a36b4498 ES |
133 | ext4_grpblk_t pa_len; /* len of preallocated chunk */ |
134 | ext4_grpblk_t pa_free; /* how many blocks are free */ | |
cc0fb9ad | 135 | unsigned short pa_type; /* pa type. inode or group */ |
a8e38fd3 | 136 | union { |
38727786 | 137 | rwlock_t *inode_lock; /* locks the rbtree holding this PA */ |
a8e38fd3 OM |
138 | spinlock_t *lg_lock; /* locks the lg list holding this PA */ |
139 | } pa_node_lock; | |
38727786 | 140 | struct inode *pa_inode; /* used to get the inode during group discard */ |
8f6e39a7 MC |
141 | }; |
142 | ||
cc0fb9ad AK |
143 | enum { |
144 | MB_INODE_PA = 0, | |
145 | MB_GROUP_PA = 1 | |
146 | }; | |
8f6e39a7 MC |
147 | |
148 | struct ext4_free_extent { | |
149 | ext4_lblk_t fe_logical; | |
53accfa9 | 150 | ext4_grpblk_t fe_start; /* In cluster units */ |
8f6e39a7 | 151 | ext4_group_t fe_group; |
53accfa9 | 152 | ext4_grpblk_t fe_len; /* In cluster units */ |
8f6e39a7 MC |
153 | }; |
154 | ||
155 | /* | |
156 | * Locality group: | |
157 | * we try to group all related changes together | |
158 | * so that writeback can flush/allocate them together as well | |
6be2ded1 AK |
159 | * Size of lg_prealloc_list hash is determined by MB_DEFAULT_GROUP_PREALLOC |
160 | * (512). We store prealloc space into the hash based on the pa_free blocks | |
161 | * order value.ie, fls(pa_free)-1; | |
8f6e39a7 | 162 | */ |
6be2ded1 | 163 | #define PREALLOC_TB_SIZE 10 |
8f6e39a7 MC |
164 | struct ext4_locality_group { |
165 | /* for allocator */ | |
6be2ded1 AK |
166 | /* to serialize allocates */ |
167 | struct mutex lg_mutex; | |
168 | /* list of preallocations */ | |
169 | struct list_head lg_prealloc_list[PREALLOC_TB_SIZE]; | |
8f6e39a7 MC |
170 | spinlock_t lg_prealloc_lock; |
171 | }; | |
172 | ||
173 | struct ext4_allocation_context { | |
174 | struct inode *ac_inode; | |
175 | struct super_block *ac_sb; | |
176 | ||
177 | /* original request */ | |
178 | struct ext4_free_extent ac_o_ex; | |
179 | ||
58696f3a | 180 | /* goal request (normalized ac_o_ex) */ |
8f6e39a7 MC |
181 | struct ext4_free_extent ac_g_ex; |
182 | ||
183 | /* the best found extent */ | |
184 | struct ext4_free_extent ac_b_ex; | |
185 | ||
ff3fc173 | 186 | /* copy of the best found extent taken before preallocation efforts */ |
8f6e39a7 MC |
187 | struct ext4_free_extent ac_f_ex; |
188 | ||
7e170922 OM |
189 | /* |
190 | * goal len can change in CR1.5, so save the original len. This is | |
191 | * used while adjusting the PA window and for accounting. | |
192 | */ | |
193 | ext4_grpblk_t ac_orig_goal_len; | |
194 | ||
196e402a HS |
195 | __u32 ac_groups_considered; |
196 | __u32 ac_flags; /* allocation hints */ | |
8f6e39a7 | 197 | __u16 ac_groups_scanned; |
196e402a | 198 | __u16 ac_groups_linear_remaining; |
8f6e39a7 | 199 | __u16 ac_found; |
fdd9a009 | 200 | __u16 ac_cX_found[EXT4_MB_NUM_CRS]; |
8f6e39a7 MC |
201 | __u16 ac_tail; |
202 | __u16 ac_buddy; | |
8f6e39a7 MC |
203 | __u8 ac_status; |
204 | __u8 ac_criteria; | |
8f6e39a7 MC |
205 | __u8 ac_2order; /* if request is to allocate 2^N blocks and |
206 | * N > 0, the field stores N, otherwise 0 */ | |
207 | __u8 ac_op; /* operation, for history only */ | |
208 | struct page *ac_bitmap_page; | |
209 | struct page *ac_buddy_page; | |
210 | struct ext4_prealloc_space *ac_pa; | |
211 | struct ext4_locality_group *ac_lg; | |
212 | }; | |
213 | ||
214 | #define AC_STATUS_CONTINUE 1 | |
215 | #define AC_STATUS_FOUND 2 | |
216 | #define AC_STATUS_BREAK 3 | |
217 | ||
8f6e39a7 MC |
218 | struct ext4_buddy { |
219 | struct page *bd_buddy_page; | |
220 | void *bd_buddy; | |
221 | struct page *bd_bitmap_page; | |
222 | void *bd_bitmap; | |
223 | struct ext4_group_info *bd_info; | |
224 | struct super_block *bd_sb; | |
225 | __u16 bd_blkbits; | |
226 | ext4_group_t bd_group; | |
227 | }; | |
8f6e39a7 | 228 | |
c3a326a6 | 229 | static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb, |
8f6e39a7 MC |
230 | struct ext4_free_extent *fex) |
231 | { | |
3212a80a TT |
232 | return ext4_group_first_block_no(sb, fex->fe_group) + |
233 | (fex->fe_start << EXT4_SB(sb)->s_cluster_bits); | |
8f6e39a7 | 234 | } |
0c9ec4be DW |
235 | |
236 | typedef int (*ext4_mballoc_query_range_fn)( | |
237 | struct super_block *sb, | |
238 | ext4_group_t agno, | |
239 | ext4_grpblk_t start, | |
240 | ext4_grpblk_t len, | |
241 | void *priv); | |
242 | ||
243 | int | |
244 | ext4_mballoc_query_range( | |
245 | struct super_block *sb, | |
246 | ext4_group_t agno, | |
247 | ext4_grpblk_t start, | |
248 | ext4_grpblk_t end, | |
249 | ext4_mballoc_query_range_fn formatter, | |
250 | void *priv); | |
251 | ||
8f6e39a7 | 252 | #endif |