1 What: /sys/fs/f2fs/<disk>/gc_max_sle 1 What: /sys/fs/f2fs/<disk>/gc_max_sleep_time
2 Date: July 2013 2 Date: July 2013
3 Contact: "Namjae Jeon" <namjae.jeon@sams 3 Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
4 Description: Controls the maximum sleep tim 4 Description: Controls the maximum sleep time for gc_thread. Time
5 is in milliseconds. 5 is in milliseconds.
6 6
7 What: /sys/fs/f2fs/<disk>/gc_min_sle 7 What: /sys/fs/f2fs/<disk>/gc_min_sleep_time
8 Date: July 2013 8 Date: July 2013
9 Contact: "Namjae Jeon" <namjae.jeon@sams 9 Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
10 Description: Controls the minimum sleep tim 10 Description: Controls the minimum sleep time for gc_thread. Time
11 is in milliseconds. 11 is in milliseconds.
12 12
13 What: /sys/fs/f2fs/<disk>/gc_no_gc_s 13 What: /sys/fs/f2fs/<disk>/gc_no_gc_sleep_time
14 Date: July 2013 14 Date: July 2013
15 Contact: "Namjae Jeon" <namjae.jeon@sams 15 Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
16 Description: Controls the default sleep tim 16 Description: Controls the default sleep time for gc_thread. Time
17 is in milliseconds. 17 is in milliseconds.
18 18
19 What: /sys/fs/f2fs/<disk>/gc_idle 19 What: /sys/fs/f2fs/<disk>/gc_idle
20 Date: July 2013 20 Date: July 2013
21 Contact: "Namjae Jeon" <namjae.jeon@sams 21 Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
22 Description: Controls the victim selection 22 Description: Controls the victim selection policy for garbage collection.
23 Setting gc_idle = 0(default) w 23 Setting gc_idle = 0(default) will disable this option. Setting:
24 24
25 =========== ================= 25 =========== ===============================================
26 gc_idle = 1 will select the C 26 gc_idle = 1 will select the Cost Benefit approach & setting
27 gc_idle = 2 will select the g 27 gc_idle = 2 will select the greedy approach & setting
28 gc_idle = 3 will select the a 28 gc_idle = 3 will select the age-threshold based approach.
29 =========== ================= 29 =========== ===============================================
30 30
31 What: /sys/fs/f2fs/<disk>/reclaim_se 31 What: /sys/fs/f2fs/<disk>/reclaim_segments
32 Date: October 2013 32 Date: October 2013
33 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 33 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
34 Description: This parameter controls the nu 34 Description: This parameter controls the number of prefree segments to be
35 reclaimed. If the number of pr 35 reclaimed. If the number of prefree segments is larger than
36 the number of segments in the 36 the number of segments in the proportion to the percentage
37 over total volume size, f2fs t 37 over total volume size, f2fs tries to conduct checkpoint to
38 reclaim the prefree segments t 38 reclaim the prefree segments to free segments.
39 By default, 5% over total # of 39 By default, 5% over total # of segments.
40 40
41 What: /sys/fs/f2fs/<disk>/main_blkad 41 What: /sys/fs/f2fs/<disk>/main_blkaddr
42 Date: November 2019 42 Date: November 2019
43 Contact: "Ramon Pantin" <pantin@google.c 43 Contact: "Ramon Pantin" <pantin@google.com>
44 Description: Shows first block address of M 44 Description: Shows first block address of MAIN area.
45 45
46 What: /sys/fs/f2fs/<disk>/ipu_policy 46 What: /sys/fs/f2fs/<disk>/ipu_policy
47 Date: November 2013 47 Date: November 2013
48 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 48 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
49 Description: Controls the in-place-update p 49 Description: Controls the in-place-update policy.
50 updates in f2fs. User can set: 50 updates in f2fs. User can set:
51 51
52 ===== =============== ======== !! 52 ==== =================
53 value policy descript !! 53 0x01 F2FS_IPU_FORCE
54 0x00 DISABLE disable !! 54 0x02 F2FS_IPU_SSR
55 0x01 FORCE all the !! 55 0x04 F2FS_IPU_UTIL
56 0x02 SSR if SSR m !! 56 0x08 F2FS_IPU_SSR_UTIL
57 0x04 UTIL if FS ut !! 57 0x10 F2FS_IPU_FSYNC
58 0x08 SSR_UTIL if SSR m !! 58 0x20 F2FS_IPU_ASYNC
59 threshol !! 59 0x40 F2FS_IPU_NOCACHE
60 0x10 FSYNC activate !! 60 0x80 F2FS_IPU_HONOR_OPU_WRITE
61 flash st !! 61 ==== =================
62 # of dir <<
63 (=defaul <<
64 0x20 ASYNC do IPU g <<
65 0x40 NOCACHE disable <<
66 0x80 HONOR_OPU_WRITE use OPU <<
67 FI_OPU_W <<
68 ===== =============== ======== <<
69 62
70 Refer segment.h for details. 63 Refer segment.h for details.
71 64
72 What: /sys/fs/f2fs/<disk>/min_ipu_ut 65 What: /sys/fs/f2fs/<disk>/min_ipu_util
73 Date: November 2013 66 Date: November 2013
74 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 67 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
75 Description: Controls the FS utilization co 68 Description: Controls the FS utilization condition for the in-place-update
76 policies. It is used by F2FS_I 69 policies. It is used by F2FS_IPU_UTIL and F2FS_IPU_SSR_UTIL policies.
77 70
78 What: /sys/fs/f2fs/<disk>/min_fsync_ 71 What: /sys/fs/f2fs/<disk>/min_fsync_blocks
79 Date: September 2014 72 Date: September 2014
80 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 73 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
81 Description: Controls the dirty page count 74 Description: Controls the dirty page count condition for the in-place-update
82 policies. 75 policies.
83 76
84 What: /sys/fs/f2fs/<disk>/min_seq_bl 77 What: /sys/fs/f2fs/<disk>/min_seq_blocks
85 Date: August 2018 78 Date: August 2018
86 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 79 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
87 Description: Controls the dirty page count 80 Description: Controls the dirty page count condition for batched sequential
88 writes in writepages. 81 writes in writepages.
89 82
90 What: /sys/fs/f2fs/<disk>/min_hot_bl 83 What: /sys/fs/f2fs/<disk>/min_hot_blocks
91 Date: March 2017 84 Date: March 2017
92 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 85 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
93 Description: Controls the dirty page count 86 Description: Controls the dirty page count condition for redefining hot data.
94 87
95 What: /sys/fs/f2fs/<disk>/min_ssr_se 88 What: /sys/fs/f2fs/<disk>/min_ssr_sections
96 Date: October 2017 89 Date: October 2017
97 Contact: "Chao Yu" <yuchao0@huawei.com> 90 Contact: "Chao Yu" <yuchao0@huawei.com>
98 Description: Controls the free section thre 91 Description: Controls the free section threshold to trigger SSR allocation.
99 If this is large, SSR mode wil 92 If this is large, SSR mode will be enabled early.
100 93
101 What: /sys/fs/f2fs/<disk>/max_small_ 94 What: /sys/fs/f2fs/<disk>/max_small_discards
102 Date: November 2013 95 Date: November 2013
103 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 96 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
104 Description: Controls the issue rate of dis 97 Description: Controls the issue rate of discard commands that consist of small
105 blocks less than 2MB. The cand !! 98 blocks less than 2MB. The candidates to be discarded are cached until
106 checkpoint, and issued by issu !! 99 checkpoint is triggered, and issued during the checkpoint.
107 It is enabled by default. !! 100 By default, it is disabled with 0.
108 101
109 What: /sys/fs/f2fs/<disk>/max_ordere 102 What: /sys/fs/f2fs/<disk>/max_ordered_discard
110 Date: October 2022 103 Date: October 2022
111 Contact: "Yangtao Li" <frank.li@vivo.com 104 Contact: "Yangtao Li" <frank.li@vivo.com>
112 Description: Controls the maximum ordered d 105 Description: Controls the maximum ordered discard, the unit size is one block(4KB).
113 Set it to 16 by default. 106 Set it to 16 by default.
114 107
115 What: /sys/fs/f2fs/<disk>/max_discar 108 What: /sys/fs/f2fs/<disk>/max_discard_request
116 Date: December 2021 109 Date: December 2021
117 Contact: "Konstantin Vyshetsky" <vkon@go 110 Contact: "Konstantin Vyshetsky" <vkon@google.com>
118 Description: Controls the number of discard 111 Description: Controls the number of discards a thread will issue at a time.
119 Higher number will allow the d 112 Higher number will allow the discard thread to finish its work
120 faster, at the cost of higher !! 113 faster, at the cost of higher latency for incomming I/O.
121 114
122 What: /sys/fs/f2fs/<disk>/min_discar 115 What: /sys/fs/f2fs/<disk>/min_discard_issue_time
123 Date: December 2021 116 Date: December 2021
124 Contact: "Konstantin Vyshetsky" <vkon@go 117 Contact: "Konstantin Vyshetsky" <vkon@google.com>
125 Description: Controls the interval the disc 118 Description: Controls the interval the discard thread will wait between
126 issuing discard requests when 119 issuing discard requests when there are discards to be issued and
127 no I/O aware interruptions occ 120 no I/O aware interruptions occur.
128 121
129 What: /sys/fs/f2fs/<disk>/mid_discar 122 What: /sys/fs/f2fs/<disk>/mid_discard_issue_time
130 Date: December 2021 123 Date: December 2021
131 Contact: "Konstantin Vyshetsky" <vkon@go 124 Contact: "Konstantin Vyshetsky" <vkon@google.com>
132 Description: Controls the interval the disc 125 Description: Controls the interval the discard thread will wait between
133 issuing discard requests when 126 issuing discard requests when there are discards to be issued and
134 an I/O aware interruption occu 127 an I/O aware interruption occurs.
135 128
136 What: /sys/fs/f2fs/<disk>/max_discar 129 What: /sys/fs/f2fs/<disk>/max_discard_issue_time
137 Date: December 2021 130 Date: December 2021
138 Contact: "Konstantin Vyshetsky" <vkon@go 131 Contact: "Konstantin Vyshetsky" <vkon@google.com>
139 Description: Controls the interval the disc 132 Description: Controls the interval the discard thread will wait when there are
140 no discard operations to be is 133 no discard operations to be issued.
141 134
142 What: /sys/fs/f2fs/<disk>/discard_gr 135 What: /sys/fs/f2fs/<disk>/discard_granularity
143 Date: July 2017 136 Date: July 2017
144 Contact: "Chao Yu" <yuchao0@huawei.com> 137 Contact: "Chao Yu" <yuchao0@huawei.com>
145 Description: Controls discard granularity o 138 Description: Controls discard granularity of inner discard thread. Inner thread
146 will not issue discards with s 139 will not issue discards with size that is smaller than granularity.
147 The unit size is one block(4KB 140 The unit size is one block(4KB), now only support configuring
148 in range of [1, 512]. Default 141 in range of [1, 512]. Default value is 16.
149 For small devices, default val 142 For small devices, default value is 1.
150 143
151 What: /sys/fs/f2fs/<disk>/umount_dis 144 What: /sys/fs/f2fs/<disk>/umount_discard_timeout
152 Date: January 2019 145 Date: January 2019
153 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 146 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
154 Description: Set timeout to issue discard c 147 Description: Set timeout to issue discard commands during umount.
155 Default: 5 secs 148 Default: 5 secs
156 149
157 What: /sys/fs/f2fs/<disk>/pending_di 150 What: /sys/fs/f2fs/<disk>/pending_discard
158 Date: November 2021 151 Date: November 2021
159 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 152 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
160 Description: Shows the number of pending di 153 Description: Shows the number of pending discard commands in the queue.
161 154
162 What: /sys/fs/f2fs/<disk>/max_victim 155 What: /sys/fs/f2fs/<disk>/max_victim_search
163 Date: January 2014 156 Date: January 2014
164 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 157 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
165 Description: Controls the number of trials 158 Description: Controls the number of trials to find a victim segment
166 when conducting SSR and cleani 159 when conducting SSR and cleaning operations. The default value
167 is 4096 which covers 8GB block 160 is 4096 which covers 8GB block address range.
168 161
169 What: /sys/fs/f2fs/<disk>/migration_ 162 What: /sys/fs/f2fs/<disk>/migration_granularity
170 Date: October 2018 163 Date: October 2018
171 Contact: "Chao Yu" <yuchao0@huawei.com> 164 Contact: "Chao Yu" <yuchao0@huawei.com>
172 Description: Controls migration granularity 165 Description: Controls migration granularity of garbage collection on large
173 section, it can let GC move pa 166 section, it can let GC move partial segment{s} of one section
174 in one GC cycle, so that dispe 167 in one GC cycle, so that dispersing heavy overhead GC to
175 multiple lightweight one. 168 multiple lightweight one.
176 169
177 What: /sys/fs/f2fs/<disk>/dir_level 170 What: /sys/fs/f2fs/<disk>/dir_level
178 Date: March 2014 171 Date: March 2014
179 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 172 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
180 Description: Controls the directory level f 173 Description: Controls the directory level for large directory. If a
181 directory has a number of file 174 directory has a number of files, it can reduce the file lookup
182 latency by increasing this dir 175 latency by increasing this dir_level value. Otherwise, it
183 needs to decrease this value t 176 needs to decrease this value to reduce the space overhead.
184 The default value is 0. 177 The default value is 0.
185 178
186 What: /sys/fs/f2fs/<disk>/ram_thresh 179 What: /sys/fs/f2fs/<disk>/ram_thresh
187 Date: March 2014 180 Date: March 2014
188 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 181 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
189 Description: Controls the memory footprint 182 Description: Controls the memory footprint used by free nids and cached
190 nat entries. By default, 1 is 183 nat entries. By default, 1 is set, which indicates
191 10 MB / 1 GB RAM. 184 10 MB / 1 GB RAM.
192 185
>> 186 What: /sys/fs/f2fs/<disk>/batched_trim_sections
>> 187 Date: February 2015
>> 188 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
>> 189 Description: Controls the trimming rate in batch mode.
>> 190 <deprecated>
>> 191
193 What: /sys/fs/f2fs/<disk>/cp_interva 192 What: /sys/fs/f2fs/<disk>/cp_interval
194 Date: October 2015 193 Date: October 2015
195 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 194 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
196 Description: Controls the checkpoint timing 195 Description: Controls the checkpoint timing, set to 60 seconds by default.
197 196
198 What: /sys/fs/f2fs/<disk>/idle_inter 197 What: /sys/fs/f2fs/<disk>/idle_interval
199 Date: January 2016 198 Date: January 2016
200 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 199 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
201 Description: Controls the idle timing of sy 200 Description: Controls the idle timing of system, if there is no FS operation
202 during given interval. 201 during given interval.
203 Set to 5 seconds by default. 202 Set to 5 seconds by default.
204 203
205 What: /sys/fs/f2fs/<disk>/discard_id 204 What: /sys/fs/f2fs/<disk>/discard_idle_interval
206 Date: September 2018 205 Date: September 2018
207 Contact: "Chao Yu" <yuchao0@huawei.com> 206 Contact: "Chao Yu" <yuchao0@huawei.com>
208 Contact: "Sahitya Tummala" <quic_stummal !! 207 Contact: "Sahitya Tummala" <stummala@codeaurora.org>
209 Description: Controls the idle timing of di 208 Description: Controls the idle timing of discard thread given
210 this time interval. 209 this time interval.
211 Default is 5 secs. 210 Default is 5 secs.
212 211
213 What: /sys/fs/f2fs/<disk>/gc_idle_in 212 What: /sys/fs/f2fs/<disk>/gc_idle_interval
214 Date: September 2018 213 Date: September 2018
215 Contact: "Chao Yu" <yuchao0@huawei.com> 214 Contact: "Chao Yu" <yuchao0@huawei.com>
216 Contact: "Sahitya Tummala" <quic_stummal !! 215 Contact: "Sahitya Tummala" <stummala@codeaurora.org>
217 Description: Controls the idle timing for g 216 Description: Controls the idle timing for gc path. Set to 5 seconds by default.
218 217
219 What: /sys/fs/f2fs/<disk>/iostat_ena 218 What: /sys/fs/f2fs/<disk>/iostat_enable
220 Date: August 2017 219 Date: August 2017
221 Contact: "Chao Yu" <yuchao0@huawei.com> 220 Contact: "Chao Yu" <yuchao0@huawei.com>
222 Description: Controls to enable/disable IO 221 Description: Controls to enable/disable IO stat.
223 222
224 What: /sys/fs/f2fs/<disk>/ra_nid_pag 223 What: /sys/fs/f2fs/<disk>/ra_nid_pages
225 Date: October 2015 224 Date: October 2015
226 Contact: "Chao Yu" <chao2.yu@samsung.com 225 Contact: "Chao Yu" <chao2.yu@samsung.com>
227 Description: Controls the count of nid page 226 Description: Controls the count of nid pages to be readaheaded.
228 When building free nids, F2FS 227 When building free nids, F2FS reads NAT blocks ahead for
229 speed up. Default is 0. 228 speed up. Default is 0.
230 229
231 What: /sys/fs/f2fs/<disk>/dirty_nats 230 What: /sys/fs/f2fs/<disk>/dirty_nats_ratio
232 Date: January 2016 231 Date: January 2016
233 Contact: "Chao Yu" <chao2.yu@samsung.com 232 Contact: "Chao Yu" <chao2.yu@samsung.com>
234 Description: Controls dirty nat entries rat 233 Description: Controls dirty nat entries ratio threshold, if current
235 ratio exceeds configured thres 234 ratio exceeds configured threshold, checkpoint will
236 be triggered for flushing dirt 235 be triggered for flushing dirty nat entries.
237 236
238 What: /sys/fs/f2fs/<disk>/lifetime_w 237 What: /sys/fs/f2fs/<disk>/lifetime_write_kbytes
239 Date: January 2016 238 Date: January 2016
240 Contact: "Shuoran Liu" <liushuoran@huawe 239 Contact: "Shuoran Liu" <liushuoran@huawei.com>
241 Description: Shows total written kbytes iss 240 Description: Shows total written kbytes issued to disk.
242 241
243 What: /sys/fs/f2fs/<disk>/features 242 What: /sys/fs/f2fs/<disk>/features
244 Date: July 2017 243 Date: July 2017
245 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 244 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
246 Description: <deprecated: should use /sys/f 245 Description: <deprecated: should use /sys/fs/f2fs/<disk>/feature_list/>
247 Shows all enabled features in 246 Shows all enabled features in current device.
248 Supported features: 247 Supported features:
249 encryption, blkzoned, extra_at 248 encryption, blkzoned, extra_attr, projquota, inode_checksum,
250 flexible_inline_xattr, quota_i 249 flexible_inline_xattr, quota_ino, inode_crtime, lost_found,
251 verity, sb_checksum, casefold, 250 verity, sb_checksum, casefold, readonly, compression, pin_file.
252 251
253 What: /sys/fs/f2fs/<disk>/feature_li 252 What: /sys/fs/f2fs/<disk>/feature_list/
254 Date: June 2021 253 Date: June 2021
255 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 254 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
256 Description: Expand /sys/fs/f2fs/<disk>/fea 255 Description: Expand /sys/fs/f2fs/<disk>/features to meet sysfs rule.
257 Supported on-disk features: 256 Supported on-disk features:
258 encryption, block_zoned (aka b 257 encryption, block_zoned (aka blkzoned), extra_attr,
259 project_quota (aka projquota), 258 project_quota (aka projquota), inode_checksum,
260 flexible_inline_xattr, quota_i 259 flexible_inline_xattr, quota_ino, inode_crtime, lost_found,
261 verity, sb_checksum, casefold, 260 verity, sb_checksum, casefold, readonly, compression.
262 Note that, pin_file is moved i 261 Note that, pin_file is moved into /sys/fs/f2fs/features/.
263 262
264 What: /sys/fs/f2fs/features/ 263 What: /sys/fs/f2fs/features/
265 Date: July 2017 264 Date: July 2017
266 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 265 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
267 Description: Shows all enabled kernel featu 266 Description: Shows all enabled kernel features.
268 Supported features: 267 Supported features:
269 encryption, block_zoned, extra 268 encryption, block_zoned, extra_attr, project_quota,
270 inode_checksum, flexible_inlin 269 inode_checksum, flexible_inline_xattr, quota_ino,
271 inode_crtime, lost_found, veri 270 inode_crtime, lost_found, verity, sb_checksum,
272 casefold, readonly, compressio 271 casefold, readonly, compression, test_dummy_encryption_v2,
273 atomic_write, pin_file, encryp 272 atomic_write, pin_file, encrypted_casefold.
274 273
275 What: /sys/fs/f2fs/<disk>/inject_rat 274 What: /sys/fs/f2fs/<disk>/inject_rate
276 Date: May 2016 275 Date: May 2016
277 Contact: "Sheng Yong" <shengyong1@huawei 276 Contact: "Sheng Yong" <shengyong1@huawei.com>
278 Description: Controls the injection rate of 277 Description: Controls the injection rate of arbitrary faults.
279 278
280 What: /sys/fs/f2fs/<disk>/inject_typ 279 What: /sys/fs/f2fs/<disk>/inject_type
281 Date: May 2016 280 Date: May 2016
282 Contact: "Sheng Yong" <shengyong1@huawei 281 Contact: "Sheng Yong" <shengyong1@huawei.com>
283 Description: Controls the injection type of 282 Description: Controls the injection type of arbitrary faults.
284 283
285 What: /sys/fs/f2fs/<disk>/dirty_segm 284 What: /sys/fs/f2fs/<disk>/dirty_segments
286 Date: October 2017 285 Date: October 2017
287 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 286 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
288 Description: Shows the number of dirty segm 287 Description: Shows the number of dirty segments.
289 288
290 What: /sys/fs/f2fs/<disk>/reserved_b 289 What: /sys/fs/f2fs/<disk>/reserved_blocks
291 Date: June 2017 290 Date: June 2017
292 Contact: "Chao Yu" <yuchao0@huawei.com> 291 Contact: "Chao Yu" <yuchao0@huawei.com>
293 Description: Controls target reserved block 292 Description: Controls target reserved blocks in system, the threshold
294 is soft, it could exceed curre 293 is soft, it could exceed current available user space.
295 294
296 What: /sys/fs/f2fs/<disk>/current_re 295 What: /sys/fs/f2fs/<disk>/current_reserved_blocks
297 Date: October 2017 296 Date: October 2017
298 Contact: "Yunlong Song" <yunlong.song@hu 297 Contact: "Yunlong Song" <yunlong.song@huawei.com>
299 Contact: "Chao Yu" <yuchao0@huawei.com> 298 Contact: "Chao Yu" <yuchao0@huawei.com>
300 Description: Shows current reserved blocks 299 Description: Shows current reserved blocks in system, it may be temporarily
301 smaller than target_reserved_b 300 smaller than target_reserved_blocks, but will gradually
302 increase to target_reserved_bl 301 increase to target_reserved_blocks when more free blocks are
303 freed by user later. 302 freed by user later.
304 303
305 What: /sys/fs/f2fs/<disk>/gc_urgent 304 What: /sys/fs/f2fs/<disk>/gc_urgent
306 Date: August 2017 305 Date: August 2017
307 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 306 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
308 Description: Do background GC aggressively 307 Description: Do background GC aggressively when set. Set to 0 by default.
309 gc urgent high(1): does GC for 308 gc urgent high(1): does GC forcibly in a period of given
310 gc_urgent_sleep_time and ignor 309 gc_urgent_sleep_time and ignores I/O idling check. uses greedy
311 GC approach and turns SSR mode 310 GC approach and turns SSR mode on.
312 gc urgent low(2): lowers the b 311 gc urgent low(2): lowers the bar of checking I/O idling in
313 order to process outstanding d 312 order to process outstanding discard commands and GC a
314 little bit aggressively. uses 313 little bit aggressively. uses cost benefit GC approach.
315 gc urgent mid(3): does GC forc 314 gc urgent mid(3): does GC forcibly in a period of given
316 gc_urgent_sleep_time and execu 315 gc_urgent_sleep_time and executes a mid level of I/O idling check.
317 uses cost benefit GC approach. 316 uses cost benefit GC approach.
318 317
319 What: /sys/fs/f2fs/<disk>/gc_urgent_ 318 What: /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
320 Date: August 2017 319 Date: August 2017
321 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 320 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
322 Description: Controls sleep time of GC urge 321 Description: Controls sleep time of GC urgent mode. Set to 500ms by default.
323 322
324 What: /sys/fs/f2fs/<disk>/readdir_ra 323 What: /sys/fs/f2fs/<disk>/readdir_ra
325 Date: November 2017 324 Date: November 2017
326 Contact: "Sheng Yong" <shengyong1@huawei 325 Contact: "Sheng Yong" <shengyong1@huawei.com>
327 Description: Controls readahead inode block 326 Description: Controls readahead inode block in readdir. Enabled by default.
328 327
329 What: /sys/fs/f2fs/<disk>/gc_pin_fil 328 What: /sys/fs/f2fs/<disk>/gc_pin_file_thresh
330 Date: January 2018 329 Date: January 2018
331 Contact: Jaegeuk Kim <jaegeuk@kernel.org 330 Contact: Jaegeuk Kim <jaegeuk@kernel.org>
332 Description: This indicates how many GC can 331 Description: This indicates how many GC can be failed for the pinned
333 file. If it exceeds this, F2FS 332 file. If it exceeds this, F2FS doesn't guarantee its pinning
334 state. 2048 trials is set by d !! 333 state. 2048 trials is set by default.
335 334
336 What: /sys/fs/f2fs/<disk>/extension_ 335 What: /sys/fs/f2fs/<disk>/extension_list
337 Date: February 2018 !! 336 Date: Feburary 2018
338 Contact: "Chao Yu" <yuchao0@huawei.com> 337 Contact: "Chao Yu" <yuchao0@huawei.com>
339 Description: Used to control configure exte 338 Description: Used to control configure extension list:
340 - Query: cat /sys/fs/f2fs/<dis 339 - Query: cat /sys/fs/f2fs/<disk>/extension_list
341 - Add: echo '[h/c]extension' > 340 - Add: echo '[h/c]extension' > /sys/fs/f2fs/<disk>/extension_list
342 - Del: echo '[h/c]!extension' 341 - Del: echo '[h/c]!extension' > /sys/fs/f2fs/<disk>/extension_list
343 - [h] means add/del hot file e 342 - [h] means add/del hot file extension
344 - [c] means add/del cold file 343 - [c] means add/del cold file extension
345 344
346 What: /sys/fs/f2fs/<disk>/unusable 345 What: /sys/fs/f2fs/<disk>/unusable
347 Date April 2019 346 Date April 2019
348 Contact: "Daniel Rosenberg" <drosen@goog 347 Contact: "Daniel Rosenberg" <drosen@google.com>
349 Description: If checkpoint=disable, it disp 348 Description: If checkpoint=disable, it displays the number of blocks that
350 are unusable. 349 are unusable.
351 If checkpoint=enable it displa 350 If checkpoint=enable it displays the number of blocks that
352 would be unusable if checkpoin 351 would be unusable if checkpoint=disable were to be set.
353 352
354 What: /sys/fs/f2fs/<disk>/encoding 353 What: /sys/fs/f2fs/<disk>/encoding
355 Date July 2019 354 Date July 2019
356 Contact: "Daniel Rosenberg" <drosen@goog 355 Contact: "Daniel Rosenberg" <drosen@google.com>
357 Description: Displays name and version of t 356 Description: Displays name and version of the encoding set for the filesystem.
358 If no encoding is set, display 357 If no encoding is set, displays (none)
359 358
360 What: /sys/fs/f2fs/<disk>/free_segme 359 What: /sys/fs/f2fs/<disk>/free_segments
361 Date: September 2019 360 Date: September 2019
362 Contact: "Hridya Valsaraju" <hridya@goog 361 Contact: "Hridya Valsaraju" <hridya@google.com>
363 Description: Number of free segments in dis 362 Description: Number of free segments in disk.
364 363
365 What: /sys/fs/f2fs/<disk>/cp_foregro 364 What: /sys/fs/f2fs/<disk>/cp_foreground_calls
366 Date: September 2019 365 Date: September 2019
367 Contact: "Hridya Valsaraju" <hridya@goog 366 Contact: "Hridya Valsaraju" <hridya@google.com>
368 Description: Number of checkpoint operation 367 Description: Number of checkpoint operations performed on demand. Available when
369 CONFIG_F2FS_STAT_FS=y. 368 CONFIG_F2FS_STAT_FS=y.
370 369
371 What: /sys/fs/f2fs/<disk>/cp_backgro 370 What: /sys/fs/f2fs/<disk>/cp_background_calls
372 Date: September 2019 371 Date: September 2019
373 Contact: "Hridya Valsaraju" <hridya@goog 372 Contact: "Hridya Valsaraju" <hridya@google.com>
374 Description: Number of checkpoint operation 373 Description: Number of checkpoint operations performed in the background to
375 free segments. Available when 374 free segments. Available when CONFIG_F2FS_STAT_FS=y.
376 375
377 What: /sys/fs/f2fs/<disk>/gc_foregro 376 What: /sys/fs/f2fs/<disk>/gc_foreground_calls
378 Date: September 2019 377 Date: September 2019
379 Contact: "Hridya Valsaraju" <hridya@goog 378 Contact: "Hridya Valsaraju" <hridya@google.com>
380 Description: Number of garbage collection o 379 Description: Number of garbage collection operations performed on demand.
381 Available when CONFIG_F2FS_STA 380 Available when CONFIG_F2FS_STAT_FS=y.
382 381
383 What: /sys/fs/f2fs/<disk>/gc_backgro 382 What: /sys/fs/f2fs/<disk>/gc_background_calls
384 Date: September 2019 383 Date: September 2019
385 Contact: "Hridya Valsaraju" <hridya@goog 384 Contact: "Hridya Valsaraju" <hridya@google.com>
386 Description: Number of garbage collection o 385 Description: Number of garbage collection operations triggered in background.
387 Available when CONFIG_F2FS_STA 386 Available when CONFIG_F2FS_STAT_FS=y.
388 387
389 What: /sys/fs/f2fs/<disk>/moved_bloc 388 What: /sys/fs/f2fs/<disk>/moved_blocks_foreground
390 Date: September 2019 389 Date: September 2019
391 Contact: "Hridya Valsaraju" <hridya@goog 390 Contact: "Hridya Valsaraju" <hridya@google.com>
392 Description: Number of blocks moved by garb 391 Description: Number of blocks moved by garbage collection in foreground.
393 Available when CONFIG_F2FS_STA 392 Available when CONFIG_F2FS_STAT_FS=y.
394 393
395 What: /sys/fs/f2fs/<disk>/moved_bloc 394 What: /sys/fs/f2fs/<disk>/moved_blocks_background
396 Date: September 2019 395 Date: September 2019
397 Contact: "Hridya Valsaraju" <hridya@goog 396 Contact: "Hridya Valsaraju" <hridya@google.com>
398 Description: Number of blocks moved by garb 397 Description: Number of blocks moved by garbage collection in background.
399 Available when CONFIG_F2FS_STA 398 Available when CONFIG_F2FS_STAT_FS=y.
400 399
401 What: /sys/fs/f2fs/<disk>/avg_vblock 400 What: /sys/fs/f2fs/<disk>/avg_vblocks
402 Date: September 2019 401 Date: September 2019
403 Contact: "Hridya Valsaraju" <hridya@goog 402 Contact: "Hridya Valsaraju" <hridya@google.com>
404 Description: Average number of valid blocks 403 Description: Average number of valid blocks.
405 Available when CONFIG_F2FS_STA 404 Available when CONFIG_F2FS_STAT_FS=y.
406 405
407 What: /sys/fs/f2fs/<disk>/mounted_ti 406 What: /sys/fs/f2fs/<disk>/mounted_time_sec
408 Date: February 2020 407 Date: February 2020
409 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 408 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
410 Description: Show the mounted time in secs 409 Description: Show the mounted time in secs of this partition.
411 410
412 What: /sys/fs/f2fs/<disk>/data_io_fl 411 What: /sys/fs/f2fs/<disk>/data_io_flag
413 Date: April 2020 412 Date: April 2020
414 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 413 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
415 Description: Give a way to attach REQ_META| 414 Description: Give a way to attach REQ_META|FUA to data writes
416 given temperature-based bits. 415 given temperature-based bits. Now the bits indicate:
417 416
418 +-------------------+--------- 417 +-------------------+-------------------+
419 | REQ_META | REQ 418 | REQ_META | REQ_FUA |
420 +------+------+-----+------+-- 419 +------+------+-----+------+------+-----+
421 | 5 | 4 | 3 | 2 | 420 | 5 | 4 | 3 | 2 | 1 | 0 |
422 +------+------+-----+------+-- 421 +------+------+-----+------+------+-----+
423 | Cold | Warm | Hot | Cold | W 422 | Cold | Warm | Hot | Cold | Warm | Hot |
424 +------+------+-----+------+-- 423 +------+------+-----+------+------+-----+
425 424
426 What: /sys/fs/f2fs/<disk>/node_io_fl 425 What: /sys/fs/f2fs/<disk>/node_io_flag
427 Date: June 2020 426 Date: June 2020
428 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 427 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
429 Description: Give a way to attach REQ_META| 428 Description: Give a way to attach REQ_META|FUA to node writes
430 given temperature-based bits. 429 given temperature-based bits. Now the bits indicate:
431 430
432 +-------------------+--------- 431 +-------------------+-------------------+
433 | REQ_META | REQ 432 | REQ_META | REQ_FUA |
434 +------+------+-----+------+-- 433 +------+------+-----+------+------+-----+
435 | 5 | 4 | 3 | 2 | 434 | 5 | 4 | 3 | 2 | 1 | 0 |
436 +------+------+-----+------+-- 435 +------+------+-----+------+------+-----+
437 | Cold | Warm | Hot | Cold | W 436 | Cold | Warm | Hot | Cold | Warm | Hot |
438 +------+------+-----+------+-- 437 +------+------+-----+------+------+-----+
439 438
440 What: /sys/fs/f2fs/<disk>/iostat_per 439 What: /sys/fs/f2fs/<disk>/iostat_period_ms
441 Date: April 2020 440 Date: April 2020
442 Contact: "Daeho Jeong" <daehojeong@googl 441 Contact: "Daeho Jeong" <daehojeong@google.com>
443 Description: Give a way to change iostat_pe 442 Description: Give a way to change iostat_period time. 3secs by default.
444 The new iostat trace gives sta 443 The new iostat trace gives stats gap given the period.
445 What: /sys/fs/f2fs/<disk>/max_io_byt 444 What: /sys/fs/f2fs/<disk>/max_io_bytes
446 Date: December 2020 445 Date: December 2020
447 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 446 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
448 Description: This gives a control to limit 447 Description: This gives a control to limit the bio size in f2fs.
449 Default is zero, which will fo 448 Default is zero, which will follow underlying block layer limit,
450 whereas, if it has a certain b 449 whereas, if it has a certain bytes value, f2fs won't submit a
451 bio larger than that size. 450 bio larger than that size.
452 451
453 What: /sys/fs/f2fs/<disk>/stat/sb_st 452 What: /sys/fs/f2fs/<disk>/stat/sb_status
454 Date: December 2020 453 Date: December 2020
455 Contact: "Chao Yu" <yuchao0@huawei.com> 454 Contact: "Chao Yu" <yuchao0@huawei.com>
456 Description: Show status of f2fs superblock 455 Description: Show status of f2fs superblock in real time.
457 456
458 ====== ===================== = 457 ====== ===================== =================================
459 value sb status macro d 458 value sb status macro description
460 0x1 SBI_IS_DIRTY d 459 0x1 SBI_IS_DIRTY dirty flag for checkpoint
461 0x2 SBI_IS_CLOSE s 460 0x2 SBI_IS_CLOSE specify unmounting
462 0x4 SBI_NEED_FSCK n 461 0x4 SBI_NEED_FSCK need fsck.f2fs to fix
463 0x8 SBI_POR_DOING r 462 0x8 SBI_POR_DOING recovery is doing or not
464 0x10 SBI_NEED_SB_WRITE n 463 0x10 SBI_NEED_SB_WRITE need to recover superblock
465 0x20 SBI_NEED_CP n 464 0x20 SBI_NEED_CP need to checkpoint
466 0x40 SBI_IS_SHUTDOWN s 465 0x40 SBI_IS_SHUTDOWN shutdown by ioctl
467 0x80 SBI_IS_RECOVERED r 466 0x80 SBI_IS_RECOVERED recovered orphan/data
468 0x100 SBI_CP_DISABLED C 467 0x100 SBI_CP_DISABLED CP was disabled last mount
469 0x200 SBI_CP_DISABLED_QUICK C 468 0x200 SBI_CP_DISABLED_QUICK CP was disabled quickly
470 0x400 SBI_QUOTA_NEED_FLUSH n 469 0x400 SBI_QUOTA_NEED_FLUSH need to flush quota info in CP
471 0x800 SBI_QUOTA_SKIP_FLUSH s 470 0x800 SBI_QUOTA_SKIP_FLUSH skip flushing quota in current CP
472 0x1000 SBI_QUOTA_NEED_REPAIR q 471 0x1000 SBI_QUOTA_NEED_REPAIR quota file may be corrupted
473 0x2000 SBI_IS_RESIZEFS r 472 0x2000 SBI_IS_RESIZEFS resizefs is in process
474 0x4000 SBI_IS_FREEZING f 473 0x4000 SBI_IS_FREEZING freefs is in process
475 ====== ===================== = 474 ====== ===================== =================================
476 475
477 What: /sys/fs/f2fs/<disk>/stat/cp_st 476 What: /sys/fs/f2fs/<disk>/stat/cp_status
478 Date: September 2022 477 Date: September 2022
479 Contact: "Chao Yu" <chao.yu@oppo.com> 478 Contact: "Chao Yu" <chao.yu@oppo.com>
480 Description: Show status of f2fs checkpoint 479 Description: Show status of f2fs checkpoint in real time.
481 480
482 ============================== 481 =============================== ==============================
483 cp flag 482 cp flag value
484 CP_UMOUNT_FLAG 483 CP_UMOUNT_FLAG 0x00000001
485 CP_ORPHAN_PRESENT_FLAG 484 CP_ORPHAN_PRESENT_FLAG 0x00000002
486 CP_COMPACT_SUM_FLAG 485 CP_COMPACT_SUM_FLAG 0x00000004
487 CP_ERROR_FLAG 486 CP_ERROR_FLAG 0x00000008
488 CP_FSCK_FLAG 487 CP_FSCK_FLAG 0x00000010
489 CP_FASTBOOT_FLAG 488 CP_FASTBOOT_FLAG 0x00000020
490 CP_CRC_RECOVERY_FLAG 489 CP_CRC_RECOVERY_FLAG 0x00000040
491 CP_NAT_BITS_FLAG 490 CP_NAT_BITS_FLAG 0x00000080
492 CP_TRIMMED_FLAG 491 CP_TRIMMED_FLAG 0x00000100
493 CP_NOCRC_RECOVERY_FLAG 492 CP_NOCRC_RECOVERY_FLAG 0x00000200
494 CP_LARGE_NAT_BITMAP_FLAG 493 CP_LARGE_NAT_BITMAP_FLAG 0x00000400
495 CP_QUOTA_NEED_FSCK_FLAG 494 CP_QUOTA_NEED_FSCK_FLAG 0x00000800
496 CP_DISABLED_FLAG 495 CP_DISABLED_FLAG 0x00001000
497 CP_DISABLED_QUICK_FLAG 496 CP_DISABLED_QUICK_FLAG 0x00002000
498 CP_RESIZEFS_FLAG 497 CP_RESIZEFS_FLAG 0x00004000
499 ============================== 498 =============================== ==============================
500 499
501 What: /sys/fs/f2fs/<disk>/stat/issue <<
502 Date: December 2023 <<
503 Contact: "Zhiguo Niu" <zhiguo.niu@unisoc <<
504 Description: Shows the number of issued dis <<
505 <<
506 What: /sys/fs/f2fs/<disk>/stat/queue <<
507 Date: December 2023 <<
508 Contact: "Zhiguo Niu" <zhiguo.niu@unisoc <<
509 Description: Shows the number of queued dis <<
510 <<
511 What: /sys/fs/f2fs/<disk>/stat/undis <<
512 Date: December 2023 <<
513 Contact: "Zhiguo Niu" <zhiguo.niu@unisoc <<
514 Description: Shows the total number of undi <<
515 <<
516 What: /sys/fs/f2fs/<disk>/ckpt_threa 500 What: /sys/fs/f2fs/<disk>/ckpt_thread_ioprio
517 Date: January 2021 501 Date: January 2021
518 Contact: "Daeho Jeong" <daehojeong@googl 502 Contact: "Daeho Jeong" <daehojeong@google.com>
519 Description: Give a way to change checkpoin 503 Description: Give a way to change checkpoint merge daemon's io priority.
520 Its default value is "be,3", w 504 Its default value is "be,3", which means "BE" I/O class and
521 I/O priority "3". We can selec 505 I/O priority "3". We can select the class between "rt" and "be",
522 and set the I/O priority withi 506 and set the I/O priority within valid range of it. "," delimiter
523 is necessary in between I/O cl 507 is necessary in between I/O class and priority number.
524 508
525 What: /sys/fs/f2fs/<disk>/ovp_segmen 509 What: /sys/fs/f2fs/<disk>/ovp_segments
526 Date: March 2021 510 Date: March 2021
527 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 511 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
528 Description: Shows the number of overprovis 512 Description: Shows the number of overprovision segments.
529 513
530 What: /sys/fs/f2fs/<disk>/compr_writ 514 What: /sys/fs/f2fs/<disk>/compr_written_block
531 Date: March 2021 515 Date: March 2021
532 Contact: "Daeho Jeong" <daehojeong@googl 516 Contact: "Daeho Jeong" <daehojeong@google.com>
533 Description: Show the block count written a 517 Description: Show the block count written after compression since mount. Note
534 that when the compressed block 518 that when the compressed blocks are deleted, this count doesn't
535 decrease. If you write "0" her 519 decrease. If you write "0" here, you can initialize
536 compr_written_block and compr_ 520 compr_written_block and compr_saved_block to "0".
537 521
538 What: /sys/fs/f2fs/<disk>/compr_save 522 What: /sys/fs/f2fs/<disk>/compr_saved_block
539 Date: March 2021 523 Date: March 2021
540 Contact: "Daeho Jeong" <daehojeong@googl 524 Contact: "Daeho Jeong" <daehojeong@google.com>
541 Description: Show the saved block count wit 525 Description: Show the saved block count with compression since mount. Note
542 that when the compressed block 526 that when the compressed blocks are deleted, this count doesn't
543 decrease. If you write "0" her 527 decrease. If you write "0" here, you can initialize
544 compr_written_block and compr_ 528 compr_written_block and compr_saved_block to "0".
545 529
546 What: /sys/fs/f2fs/<disk>/compr_new_ 530 What: /sys/fs/f2fs/<disk>/compr_new_inode
547 Date: March 2021 531 Date: March 2021
548 Contact: "Daeho Jeong" <daehojeong@googl 532 Contact: "Daeho Jeong" <daehojeong@google.com>
549 Description: Show the count of inode newly 533 Description: Show the count of inode newly enabled for compression since mount.
550 Note that when the compression 534 Note that when the compression is disabled for the files, this count
551 doesn't decrease. If you write 535 doesn't decrease. If you write "0" here, you can initialize
552 compr_new_inode to "0". 536 compr_new_inode to "0".
553 537
554 What: /sys/fs/f2fs/<disk>/atgc_candi 538 What: /sys/fs/f2fs/<disk>/atgc_candidate_ratio
555 Date: May 2021 539 Date: May 2021
556 Contact: "Chao Yu" <yuchao0@huawei.com> 540 Contact: "Chao Yu" <yuchao0@huawei.com>
557 Description: When ATGC is on, it controls c 541 Description: When ATGC is on, it controls candidate ratio in order to limit total
558 number of potential victim in 542 number of potential victim in all candidates, the value should be in
559 range of [0, 100], by default 543 range of [0, 100], by default it was initialized as 20(%).
560 544
561 What: /sys/fs/f2fs/<disk>/atgc_candi 545 What: /sys/fs/f2fs/<disk>/atgc_candidate_count
562 Date: May 2021 546 Date: May 2021
563 Contact: "Chao Yu" <yuchao0@huawei.com> 547 Contact: "Chao Yu" <yuchao0@huawei.com>
564 Description: When ATGC is on, it controls c 548 Description: When ATGC is on, it controls candidate count in order to limit total
565 number of potential victim in 549 number of potential victim in all candidates, by default it was
566 initialized as 10 (sections). 550 initialized as 10 (sections).
567 551
568 What: /sys/fs/f2fs/<disk>/atgc_age_w 552 What: /sys/fs/f2fs/<disk>/atgc_age_weight
569 Date: May 2021 553 Date: May 2021
570 Contact: "Chao Yu" <yuchao0@huawei.com> 554 Contact: "Chao Yu" <yuchao0@huawei.com>
571 Description: When ATGC is on, it controls a 555 Description: When ATGC is on, it controls age weight to balance weight proportion
572 in between aging and valid blo 556 in between aging and valid blocks, the value should be in range of
573 [0, 100], by default it was in 557 [0, 100], by default it was initialized as 60(%).
574 558
575 What: /sys/fs/f2fs/<disk>/atgc_age_t 559 What: /sys/fs/f2fs/<disk>/atgc_age_threshold
576 Date: May 2021 560 Date: May 2021
577 Contact: "Chao Yu" <yuchao0@huawei.com> 561 Contact: "Chao Yu" <yuchao0@huawei.com>
578 Description: When ATGC is on, it controls a 562 Description: When ATGC is on, it controls age threshold to bypass GCing young
579 candidates whose age is not be 563 candidates whose age is not beyond the threshold, by default it was
580 initialized as 604800 seconds 564 initialized as 604800 seconds (equals to 7 days).
581 565
582 What: /sys/fs/f2fs/<disk>/atgc_enabl <<
583 Date: Feb 2024 <<
584 Contact: "Jinbao Liu" <liujinbao1@xiaomi <<
585 Description: It represents whether ATGC is <<
586 indicates that ATGC is on, and <<
587 <<
588 What: /sys/fs/f2fs/<disk>/gc_reclaim 566 What: /sys/fs/f2fs/<disk>/gc_reclaimed_segments
589 Date: July 2021 567 Date: July 2021
590 Contact: "Daeho Jeong" <daehojeong@googl 568 Contact: "Daeho Jeong" <daehojeong@google.com>
591 Description: Show how many segments have be 569 Description: Show how many segments have been reclaimed by GC during a specific
592 GC mode (0: GC normal, 1: GC i 570 GC mode (0: GC normal, 1: GC idle CB, 2: GC idle greedy,
593 3: GC idle AT, 4: GC urgent hi 571 3: GC idle AT, 4: GC urgent high, 5: GC urgent low 6: GC urgent mid)
594 You can re-initialize this val 572 You can re-initialize this value to "0".
595 573
596 What: /sys/fs/f2fs/<disk>/gc_segment 574 What: /sys/fs/f2fs/<disk>/gc_segment_mode
597 Date: July 2021 575 Date: July 2021
598 Contact: "Daeho Jeong" <daehojeong@googl 576 Contact: "Daeho Jeong" <daehojeong@google.com>
599 Description: You can control for which gc m 577 Description: You can control for which gc mode the "gc_reclaimed_segments" node shows.
600 Refer to the description of th 578 Refer to the description of the modes in "gc_reclaimed_segments".
601 579
602 What: /sys/fs/f2fs/<disk>/seq_file_r 580 What: /sys/fs/f2fs/<disk>/seq_file_ra_mul
603 Date: July 2021 581 Date: July 2021
604 Contact: "Daeho Jeong" <daehojeong@googl 582 Contact: "Daeho Jeong" <daehojeong@google.com>
605 Description: You can control the multiplier 583 Description: You can control the multiplier value of bdi device readahead window size
606 between 2 (default) and 256 fo 584 between 2 (default) and 256 for POSIX_FADV_SEQUENTIAL advise option.
607 585
608 What: /sys/fs/f2fs/<disk>/max_fragme 586 What: /sys/fs/f2fs/<disk>/max_fragment_chunk
609 Date: August 2021 587 Date: August 2021
610 Contact: "Daeho Jeong" <daehojeong@googl 588 Contact: "Daeho Jeong" <daehojeong@google.com>
611 Description: With "mode=fragment:block" mou 589 Description: With "mode=fragment:block" mount options, we can scatter block allocation.
612 f2fs will allocate 1..<max_fra 590 f2fs will allocate 1..<max_fragment_chunk> blocks in a chunk and make a hole
613 in the length of 1..<max_fragm 591 in the length of 1..<max_fragment_hole> by turns. This value can be set
614 between 1..512 and the default 592 between 1..512 and the default value is 4.
615 593
616 What: /sys/fs/f2fs/<disk>/max_fragme 594 What: /sys/fs/f2fs/<disk>/max_fragment_hole
617 Date: August 2021 595 Date: August 2021
618 Contact: "Daeho Jeong" <daehojeong@googl 596 Contact: "Daeho Jeong" <daehojeong@google.com>
619 Description: With "mode=fragment:block" mou 597 Description: With "mode=fragment:block" mount options, we can scatter block allocation.
620 f2fs will allocate 1..<max_fra 598 f2fs will allocate 1..<max_fragment_chunk> blocks in a chunk and make a hole
621 in the length of 1..<max_fragm 599 in the length of 1..<max_fragment_hole> by turns. This value can be set
622 between 1..512 and the default 600 between 1..512 and the default value is 4.
623 601
624 What: /sys/fs/f2fs/<disk>/gc_remaini 602 What: /sys/fs/f2fs/<disk>/gc_remaining_trials
625 Date: October 2022 603 Date: October 2022
626 Contact: "Yangtao Li" <frank.li@vivo.com 604 Contact: "Yangtao Li" <frank.li@vivo.com>
627 Description: You can set the trial count li 605 Description: You can set the trial count limit for GC urgent and idle mode with this value.
628 If GC thread gets to the limit 606 If GC thread gets to the limit, the mode will turn back to GC normal mode.
629 By default, the value is zero, 607 By default, the value is zero, which means there is no limit like before.
630 608
631 What: /sys/fs/f2fs/<disk>/max_roll_f 609 What: /sys/fs/f2fs/<disk>/max_roll_forward_node_blocks
632 Date: January 2022 610 Date: January 2022
633 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 611 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
634 Description: Controls max # of node block w 612 Description: Controls max # of node block writes to be used for roll forward
635 recovery. This can limit the r 613 recovery. This can limit the roll forward recovery time.
636 614
637 What: /sys/fs/f2fs/<disk>/unusable_b 615 What: /sys/fs/f2fs/<disk>/unusable_blocks_per_sec
638 Date: June 2022 616 Date: June 2022
639 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 617 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
640 Description: Shows the number of unusable b 618 Description: Shows the number of unusable blocks in a section which was defined by
641 the zone capacity reported by 619 the zone capacity reported by underlying zoned device.
642 620
643 What: /sys/fs/f2fs/<disk>/current_at 621 What: /sys/fs/f2fs/<disk>/current_atomic_write
644 Date: July 2022 622 Date: July 2022
645 Contact: "Daeho Jeong" <daehojeong@googl 623 Contact: "Daeho Jeong" <daehojeong@google.com>
646 Description: Show the total current atomic 624 Description: Show the total current atomic write block count, which is not committed yet.
647 This is a read-only entry. 625 This is a read-only entry.
648 626
649 What: /sys/fs/f2fs/<disk>/peak_atomi 627 What: /sys/fs/f2fs/<disk>/peak_atomic_write
650 Date: July 2022 628 Date: July 2022
651 Contact: "Daeho Jeong" <daehojeong@googl 629 Contact: "Daeho Jeong" <daehojeong@google.com>
652 Description: Show the peak value of total c 630 Description: Show the peak value of total current atomic write block count after boot.
653 If you write "0" here, you can 631 If you write "0" here, you can initialize to "0".
654 632
655 What: /sys/fs/f2fs/<disk>/committed_ 633 What: /sys/fs/f2fs/<disk>/committed_atomic_block
656 Date: July 2022 634 Date: July 2022
657 Contact: "Daeho Jeong" <daehojeong@googl 635 Contact: "Daeho Jeong" <daehojeong@google.com>
658 Description: Show the accumulated total com 636 Description: Show the accumulated total committed atomic write block count after boot.
659 If you write "0" here, you can 637 If you write "0" here, you can initialize to "0".
660 638
661 What: /sys/fs/f2fs/<disk>/revoked_at 639 What: /sys/fs/f2fs/<disk>/revoked_atomic_block
662 Date: July 2022 640 Date: July 2022
663 Contact: "Daeho Jeong" <daehojeong@googl 641 Contact: "Daeho Jeong" <daehojeong@google.com>
664 Description: Show the accumulated total rev 642 Description: Show the accumulated total revoked atomic write block count after boot.
665 If you write "0" here, you can 643 If you write "0" here, you can initialize to "0".
666 644
667 What: /sys/fs/f2fs/<disk>/gc_mode 645 What: /sys/fs/f2fs/<disk>/gc_mode
668 Date: October 2022 646 Date: October 2022
669 Contact: "Yangtao Li" <frank.li@vivo.com 647 Contact: "Yangtao Li" <frank.li@vivo.com>
670 Description: Show the current gc_mode as a 648 Description: Show the current gc_mode as a string.
671 This is a read-only entry. 649 This is a read-only entry.
672 650
673 What: /sys/fs/f2fs/<disk>/discard_ur 651 What: /sys/fs/f2fs/<disk>/discard_urgent_util
674 Date: November 2022 652 Date: November 2022
675 Contact: "Yangtao Li" <frank.li@vivo.com 653 Contact: "Yangtao Li" <frank.li@vivo.com>
676 Description: When space utilization exceeds 654 Description: When space utilization exceeds this, do background DISCARD aggressively.
677 Does DISCARD forcibly in a per 655 Does DISCARD forcibly in a period of given min_discard_issue_time when the number
678 of discards is not 0 and set d 656 of discards is not 0 and set discard granularity to 1.
679 Default: 80 657 Default: 80
680 658
681 What: /sys/fs/f2fs/<disk>/hot_data_a 659 What: /sys/fs/f2fs/<disk>/hot_data_age_threshold
682 Date: November 2022 660 Date: November 2022
683 Contact: "Ping Xiong" <xiongping1@xiaomi 661 Contact: "Ping Xiong" <xiongping1@xiaomi.com>
684 Description: When DATA SEPARATION is on, it 662 Description: When DATA SEPARATION is on, it controls the age threshold to indicate
685 the data blocks as hot. By def 663 the data blocks as hot. By default it was initialized as 262144 blocks
686 (equals to 1GB). 664 (equals to 1GB).
687 665
688 What: /sys/fs/f2fs/<disk>/warm_data_ 666 What: /sys/fs/f2fs/<disk>/warm_data_age_threshold
689 Date: November 2022 667 Date: November 2022
690 Contact: "Ping Xiong" <xiongping1@xiaomi 668 Contact: "Ping Xiong" <xiongping1@xiaomi.com>
691 Description: When DATA SEPARATION is on, it 669 Description: When DATA SEPARATION is on, it controls the age threshold to indicate
692 the data blocks as warm. By de 670 the data blocks as warm. By default it was initialized as 2621440 blocks
693 (equals to 10GB). 671 (equals to 10GB).
694 <<
695 What: /sys/fs/f2fs/<disk>/fault_rate <<
696 Date: May 2016 <<
697 Contact: "Sheng Yong" <shengyong@oppo.co <<
698 Contact: "Chao Yu" <chao@kernel.org> <<
699 Description: Enable fault injection in all <<
700 specified injection rate. <<
701 <<
702 What: /sys/fs/f2fs/<disk>/fault_type <<
703 Date: May 2016 <<
704 Contact: "Sheng Yong" <shengyong@oppo.co <<
705 Contact: "Chao Yu" <chao@kernel.org> <<
706 Description: Support configuring fault inje <<
707 enabled with fault_injection o <<
708 is shown below, it supports si <<
709 <<
710 =========================== <<
711 Type_Name <<
712 =========================== <<
713 FAULT_KMALLOC <<
714 FAULT_KVMALLOC <<
715 FAULT_PAGE_ALLOC <<
716 FAULT_PAGE_GET <<
717 FAULT_ALLOC_BIO <<
718 FAULT_ALLOC_NID <<
719 FAULT_ORPHAN <<
720 FAULT_BLOCK <<
721 FAULT_DIR_DEPTH <<
722 FAULT_EVICT_INODE <<
723 FAULT_TRUNCATE <<
724 FAULT_READ_IO <<
725 FAULT_CHECKPOINT <<
726 FAULT_DISCARD <<
727 FAULT_WRITE_IO <<
728 FAULT_SLAB_ALLOC <<
729 FAULT_DQUOT_INIT <<
730 FAULT_LOCK_OP <<
731 FAULT_BLKADDR_VALIDITY <<
732 FAULT_BLKADDR_CONSISTENCE <<
733 FAULT_NO_SEGMENT <<
734 =========================== <<
735 <<
736 What: /sys/fs/f2fs/<disk>/discard_io <<
737 Date: January 2023 <<
738 Contact: "Yangtao Li" <frank.li@vivo.com <<
739 Description: Controls background discard gr <<
740 when is not in idle. Inner thr <<
741 is smaller than granularity. T <<
742 support configuring in range o <<
743 Default: 512 <<
744 <<
745 What: /sys/fs/f2fs/<disk>/last_age_w <<
746 Date: January 2023 <<
747 Contact: "Ping Xiong" <xiongping1@xiaomi <<
748 Description: When DATA SEPARATION is on, it <<
749 <<
750 What: /sys/fs/f2fs/<disk>/compress_w <<
751 Date: February 2023 <<
752 Contact: "Yangtao Li" <frank.li@vivo.com <<
753 Description: When compress cache is on, it <<
754 in order to limit caching comp <<
755 than watermark, then deny cach <<
756 range of (0, 100], by default <<
757 <<
758 What: /sys/fs/f2fs/<disk>/compress_p <<
759 Date: February 2023 <<
760 Contact: "Yangtao Li" <frank.li@vivo.com <<
761 Description: When compress cache is on, it <<
762 percent(compress pages / free_ <<
763 If cached page percent exceed <<
764 The value should be in range o <<
765 as 20(%). <<
766 <<
767 What: /sys/fs/f2fs/<disk>/discard_io <<
768 Date: November 2023 <<
769 Contact: "Chao Yu" <chao@kernel.org> <<
770 Description: It controls to enable/disable <<
771 By default, the value is 1 whi <<
772 <<
773 What: /sys/fs/f2fs/<disk>/blkzone_al <<
774 Date: July 2024 <<
775 Contact: "Yuanhong Liao" <liaoyuanhong@v <<
776 Description: The zone UFS we are currently <<
777 conventional zones and sequent <<
778 to prioritize for writes, with <<
779 <<
780 ======================== ==== <<
781 value <<
782 blkzone_alloc_policy = 0 Prio <<
783 blkzone_alloc_policy = 1 Only <<
784 blkzone_alloc_policy = 2 Prio <<
785 ======================== ==== <<
786 <<
787 What: /sys/fs/f2fs/<disk>/migration_ <<
788 Date: September 2024 <<
789 Contact: "Daeho Jeong" <daehojeong@googl <<
790 Description: Controls migration window gran <<
791 section. it can control the sc <<
792 in a unit of segment, while mi <<
793 of segments which can be migra <<
794 <<
795 What: /sys/fs/f2fs/<disk>/reserved_s <<
796 Date: September 2024 <<
797 Contact: "Daeho Jeong" <daehojeong@googl <<
798 Description: In order to fine tune GC behav <<
799 reserved segments. <<
800 <<
801 What: /sys/fs/f2fs/<disk>/gc_no_zone <<
802 Date: September 2024 <<
803 Contact: "Daeho Jeong" <daehojeong@googl <<
804 Description: If the percentage of free sect <<
805 number, F2FS do not garbage co <<
806 background GC thread. the defa <<
807 <<
808 What: /sys/fs/f2fs/<disk>/gc_boost_z <<
809 Date: September 2024 <<
810 Contact: "Daeho Jeong" <daehojeong@googl <<
811 Description: If the percentage of free sect <<
812 number, F2FS boosts garbage co <<
813 background GC thread. the defa <<
814 <<
815 What: /sys/fs/f2fs/<disk>/gc_valid_t <<
816 Date: September 2024 <<
817 Contact: "Daeho Jeong" <daehojeong@googl <<
818 Description: It controls the valid block ra <<
819 for zoned deivces. The initial <<
820 background GC thread from inti <<
821 exceeding the ratio. <<
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