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 <<
109 What: /sys/fs/f2fs/<disk>/max_ordere <<
110 Date: October 2022 <<
111 Contact: "Yangtao Li" <frank.li@vivo.com <<
112 Description: Controls the maximum ordered d <<
113 Set it to 16 by default. <<
114 101
115 What: /sys/fs/f2fs/<disk>/max_discar 102 What: /sys/fs/f2fs/<disk>/max_discard_request
116 Date: December 2021 103 Date: December 2021
117 Contact: "Konstantin Vyshetsky" <vkon@go 104 Contact: "Konstantin Vyshetsky" <vkon@google.com>
118 Description: Controls the number of discard 105 Description: Controls the number of discards a thread will issue at a time.
119 Higher number will allow the d 106 Higher number will allow the discard thread to finish its work
120 faster, at the cost of higher !! 107 faster, at the cost of higher latency for incomming I/O.
121 108
122 What: /sys/fs/f2fs/<disk>/min_discar 109 What: /sys/fs/f2fs/<disk>/min_discard_issue_time
123 Date: December 2021 110 Date: December 2021
124 Contact: "Konstantin Vyshetsky" <vkon@go 111 Contact: "Konstantin Vyshetsky" <vkon@google.com>
125 Description: Controls the interval the disc 112 Description: Controls the interval the discard thread will wait between
126 issuing discard requests when 113 issuing discard requests when there are discards to be issued and
127 no I/O aware interruptions occ 114 no I/O aware interruptions occur.
128 115
129 What: /sys/fs/f2fs/<disk>/mid_discar 116 What: /sys/fs/f2fs/<disk>/mid_discard_issue_time
130 Date: December 2021 117 Date: December 2021
131 Contact: "Konstantin Vyshetsky" <vkon@go 118 Contact: "Konstantin Vyshetsky" <vkon@google.com>
132 Description: Controls the interval the disc 119 Description: Controls the interval the discard thread will wait between
133 issuing discard requests when 120 issuing discard requests when there are discards to be issued and
134 an I/O aware interruption occu 121 an I/O aware interruption occurs.
135 122
136 What: /sys/fs/f2fs/<disk>/max_discar 123 What: /sys/fs/f2fs/<disk>/max_discard_issue_time
137 Date: December 2021 124 Date: December 2021
138 Contact: "Konstantin Vyshetsky" <vkon@go 125 Contact: "Konstantin Vyshetsky" <vkon@google.com>
139 Description: Controls the interval the disc 126 Description: Controls the interval the discard thread will wait when there are
140 no discard operations to be is 127 no discard operations to be issued.
141 128
142 What: /sys/fs/f2fs/<disk>/discard_gr 129 What: /sys/fs/f2fs/<disk>/discard_granularity
143 Date: July 2017 130 Date: July 2017
144 Contact: "Chao Yu" <yuchao0@huawei.com> 131 Contact: "Chao Yu" <yuchao0@huawei.com>
145 Description: Controls discard granularity o 132 Description: Controls discard granularity of inner discard thread. Inner thread
146 will not issue discards with s 133 will not issue discards with size that is smaller than granularity.
147 The unit size is one block(4KB 134 The unit size is one block(4KB), now only support configuring
148 in range of [1, 512]. Default !! 135 in range of [1, 512]. Default value is 4(=16KB).
149 For small devices, default val <<
150 136
151 What: /sys/fs/f2fs/<disk>/umount_dis 137 What: /sys/fs/f2fs/<disk>/umount_discard_timeout
152 Date: January 2019 138 Date: January 2019
153 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 139 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
154 Description: Set timeout to issue discard c 140 Description: Set timeout to issue discard commands during umount.
155 Default: 5 secs 141 Default: 5 secs
156 142
157 What: /sys/fs/f2fs/<disk>/pending_di 143 What: /sys/fs/f2fs/<disk>/pending_discard
158 Date: November 2021 144 Date: November 2021
159 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 145 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
160 Description: Shows the number of pending di 146 Description: Shows the number of pending discard commands in the queue.
161 147
162 What: /sys/fs/f2fs/<disk>/max_victim 148 What: /sys/fs/f2fs/<disk>/max_victim_search
163 Date: January 2014 149 Date: January 2014
164 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 150 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
165 Description: Controls the number of trials 151 Description: Controls the number of trials to find a victim segment
166 when conducting SSR and cleani 152 when conducting SSR and cleaning operations. The default value
167 is 4096 which covers 8GB block 153 is 4096 which covers 8GB block address range.
168 154
169 What: /sys/fs/f2fs/<disk>/migration_ 155 What: /sys/fs/f2fs/<disk>/migration_granularity
170 Date: October 2018 156 Date: October 2018
171 Contact: "Chao Yu" <yuchao0@huawei.com> 157 Contact: "Chao Yu" <yuchao0@huawei.com>
172 Description: Controls migration granularity 158 Description: Controls migration granularity of garbage collection on large
173 section, it can let GC move pa 159 section, it can let GC move partial segment{s} of one section
174 in one GC cycle, so that dispe 160 in one GC cycle, so that dispersing heavy overhead GC to
175 multiple lightweight one. 161 multiple lightweight one.
176 162
177 What: /sys/fs/f2fs/<disk>/dir_level 163 What: /sys/fs/f2fs/<disk>/dir_level
178 Date: March 2014 164 Date: March 2014
179 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 165 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
180 Description: Controls the directory level f 166 Description: Controls the directory level for large directory. If a
181 directory has a number of file 167 directory has a number of files, it can reduce the file lookup
182 latency by increasing this dir 168 latency by increasing this dir_level value. Otherwise, it
183 needs to decrease this value t 169 needs to decrease this value to reduce the space overhead.
184 The default value is 0. 170 The default value is 0.
185 171
186 What: /sys/fs/f2fs/<disk>/ram_thresh 172 What: /sys/fs/f2fs/<disk>/ram_thresh
187 Date: March 2014 173 Date: March 2014
188 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams 174 Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
189 Description: Controls the memory footprint 175 Description: Controls the memory footprint used by free nids and cached
190 nat entries. By default, 1 is 176 nat entries. By default, 1 is set, which indicates
191 10 MB / 1 GB RAM. 177 10 MB / 1 GB RAM.
192 178
>> 179 What: /sys/fs/f2fs/<disk>/batched_trim_sections
>> 180 Date: February 2015
>> 181 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
>> 182 Description: Controls the trimming rate in batch mode.
>> 183 <deprecated>
>> 184
193 What: /sys/fs/f2fs/<disk>/cp_interva 185 What: /sys/fs/f2fs/<disk>/cp_interval
194 Date: October 2015 186 Date: October 2015
195 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 187 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
196 Description: Controls the checkpoint timing 188 Description: Controls the checkpoint timing, set to 60 seconds by default.
197 189
198 What: /sys/fs/f2fs/<disk>/idle_inter 190 What: /sys/fs/f2fs/<disk>/idle_interval
199 Date: January 2016 191 Date: January 2016
200 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 192 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
201 Description: Controls the idle timing of sy 193 Description: Controls the idle timing of system, if there is no FS operation
202 during given interval. 194 during given interval.
203 Set to 5 seconds by default. 195 Set to 5 seconds by default.
204 196
205 What: /sys/fs/f2fs/<disk>/discard_id 197 What: /sys/fs/f2fs/<disk>/discard_idle_interval
206 Date: September 2018 198 Date: September 2018
207 Contact: "Chao Yu" <yuchao0@huawei.com> 199 Contact: "Chao Yu" <yuchao0@huawei.com>
208 Contact: "Sahitya Tummala" <quic_stummal !! 200 Contact: "Sahitya Tummala" <stummala@codeaurora.org>
209 Description: Controls the idle timing of di 201 Description: Controls the idle timing of discard thread given
210 this time interval. 202 this time interval.
211 Default is 5 secs. 203 Default is 5 secs.
212 204
213 What: /sys/fs/f2fs/<disk>/gc_idle_in 205 What: /sys/fs/f2fs/<disk>/gc_idle_interval
214 Date: September 2018 206 Date: September 2018
215 Contact: "Chao Yu" <yuchao0@huawei.com> 207 Contact: "Chao Yu" <yuchao0@huawei.com>
216 Contact: "Sahitya Tummala" <quic_stummal !! 208 Contact: "Sahitya Tummala" <stummala@codeaurora.org>
217 Description: Controls the idle timing for g 209 Description: Controls the idle timing for gc path. Set to 5 seconds by default.
218 210
219 What: /sys/fs/f2fs/<disk>/iostat_ena 211 What: /sys/fs/f2fs/<disk>/iostat_enable
220 Date: August 2017 212 Date: August 2017
221 Contact: "Chao Yu" <yuchao0@huawei.com> 213 Contact: "Chao Yu" <yuchao0@huawei.com>
222 Description: Controls to enable/disable IO 214 Description: Controls to enable/disable IO stat.
223 215
224 What: /sys/fs/f2fs/<disk>/ra_nid_pag 216 What: /sys/fs/f2fs/<disk>/ra_nid_pages
225 Date: October 2015 217 Date: October 2015
226 Contact: "Chao Yu" <chao2.yu@samsung.com 218 Contact: "Chao Yu" <chao2.yu@samsung.com>
227 Description: Controls the count of nid page 219 Description: Controls the count of nid pages to be readaheaded.
228 When building free nids, F2FS 220 When building free nids, F2FS reads NAT blocks ahead for
229 speed up. Default is 0. 221 speed up. Default is 0.
230 222
231 What: /sys/fs/f2fs/<disk>/dirty_nats 223 What: /sys/fs/f2fs/<disk>/dirty_nats_ratio
232 Date: January 2016 224 Date: January 2016
233 Contact: "Chao Yu" <chao2.yu@samsung.com 225 Contact: "Chao Yu" <chao2.yu@samsung.com>
234 Description: Controls dirty nat entries rat 226 Description: Controls dirty nat entries ratio threshold, if current
235 ratio exceeds configured thres 227 ratio exceeds configured threshold, checkpoint will
236 be triggered for flushing dirt 228 be triggered for flushing dirty nat entries.
237 229
238 What: /sys/fs/f2fs/<disk>/lifetime_w 230 What: /sys/fs/f2fs/<disk>/lifetime_write_kbytes
239 Date: January 2016 231 Date: January 2016
240 Contact: "Shuoran Liu" <liushuoran@huawe 232 Contact: "Shuoran Liu" <liushuoran@huawei.com>
241 Description: Shows total written kbytes iss 233 Description: Shows total written kbytes issued to disk.
242 234
243 What: /sys/fs/f2fs/<disk>/features 235 What: /sys/fs/f2fs/<disk>/features
244 Date: July 2017 236 Date: July 2017
245 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 237 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
246 Description: <deprecated: should use /sys/f !! 238 Description: <deprecated: should use /sys/fs/f2fs/<disk>/feature_list/
247 Shows all enabled features in 239 Shows all enabled features in current device.
248 Supported features: 240 Supported features:
249 encryption, blkzoned, extra_at 241 encryption, blkzoned, extra_attr, projquota, inode_checksum,
250 flexible_inline_xattr, quota_i 242 flexible_inline_xattr, quota_ino, inode_crtime, lost_found,
251 verity, sb_checksum, casefold, 243 verity, sb_checksum, casefold, readonly, compression, pin_file.
252 244
253 What: /sys/fs/f2fs/<disk>/feature_li 245 What: /sys/fs/f2fs/<disk>/feature_list/
254 Date: June 2021 246 Date: June 2021
255 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 247 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
256 Description: Expand /sys/fs/f2fs/<disk>/fea 248 Description: Expand /sys/fs/f2fs/<disk>/features to meet sysfs rule.
257 Supported on-disk features: 249 Supported on-disk features:
258 encryption, block_zoned (aka b 250 encryption, block_zoned (aka blkzoned), extra_attr,
259 project_quota (aka projquota), 251 project_quota (aka projquota), inode_checksum,
260 flexible_inline_xattr, quota_i 252 flexible_inline_xattr, quota_ino, inode_crtime, lost_found,
261 verity, sb_checksum, casefold, 253 verity, sb_checksum, casefold, readonly, compression.
262 Note that, pin_file is moved i 254 Note that, pin_file is moved into /sys/fs/f2fs/features/.
263 255
264 What: /sys/fs/f2fs/features/ 256 What: /sys/fs/f2fs/features/
265 Date: July 2017 257 Date: July 2017
266 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 258 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
267 Description: Shows all enabled kernel featu 259 Description: Shows all enabled kernel features.
268 Supported features: 260 Supported features:
269 encryption, block_zoned, extra 261 encryption, block_zoned, extra_attr, project_quota,
270 inode_checksum, flexible_inlin 262 inode_checksum, flexible_inline_xattr, quota_ino,
271 inode_crtime, lost_found, veri 263 inode_crtime, lost_found, verity, sb_checksum,
272 casefold, readonly, compressio 264 casefold, readonly, compression, test_dummy_encryption_v2,
273 atomic_write, pin_file, encryp 265 atomic_write, pin_file, encrypted_casefold.
274 266
275 What: /sys/fs/f2fs/<disk>/inject_rat 267 What: /sys/fs/f2fs/<disk>/inject_rate
276 Date: May 2016 268 Date: May 2016
277 Contact: "Sheng Yong" <shengyong1@huawei 269 Contact: "Sheng Yong" <shengyong1@huawei.com>
278 Description: Controls the injection rate of 270 Description: Controls the injection rate of arbitrary faults.
279 271
280 What: /sys/fs/f2fs/<disk>/inject_typ 272 What: /sys/fs/f2fs/<disk>/inject_type
281 Date: May 2016 273 Date: May 2016
282 Contact: "Sheng Yong" <shengyong1@huawei 274 Contact: "Sheng Yong" <shengyong1@huawei.com>
283 Description: Controls the injection type of 275 Description: Controls the injection type of arbitrary faults.
284 276
285 What: /sys/fs/f2fs/<disk>/dirty_segm 277 What: /sys/fs/f2fs/<disk>/dirty_segments
286 Date: October 2017 278 Date: October 2017
287 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 279 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
288 Description: Shows the number of dirty segm 280 Description: Shows the number of dirty segments.
289 281
290 What: /sys/fs/f2fs/<disk>/reserved_b 282 What: /sys/fs/f2fs/<disk>/reserved_blocks
291 Date: June 2017 283 Date: June 2017
292 Contact: "Chao Yu" <yuchao0@huawei.com> 284 Contact: "Chao Yu" <yuchao0@huawei.com>
293 Description: Controls target reserved block 285 Description: Controls target reserved blocks in system, the threshold
294 is soft, it could exceed curre 286 is soft, it could exceed current available user space.
295 287
296 What: /sys/fs/f2fs/<disk>/current_re 288 What: /sys/fs/f2fs/<disk>/current_reserved_blocks
297 Date: October 2017 289 Date: October 2017
298 Contact: "Yunlong Song" <yunlong.song@hu 290 Contact: "Yunlong Song" <yunlong.song@huawei.com>
299 Contact: "Chao Yu" <yuchao0@huawei.com> 291 Contact: "Chao Yu" <yuchao0@huawei.com>
300 Description: Shows current reserved blocks 292 Description: Shows current reserved blocks in system, it may be temporarily
301 smaller than target_reserved_b 293 smaller than target_reserved_blocks, but will gradually
302 increase to target_reserved_bl 294 increase to target_reserved_blocks when more free blocks are
303 freed by user later. 295 freed by user later.
304 296
305 What: /sys/fs/f2fs/<disk>/gc_urgent 297 What: /sys/fs/f2fs/<disk>/gc_urgent
306 Date: August 2017 298 Date: August 2017
307 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 299 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
308 Description: Do background GC aggressively 300 Description: Do background GC aggressively when set. Set to 0 by default.
309 gc urgent high(1): does GC for 301 gc urgent high(1): does GC forcibly in a period of given
310 gc_urgent_sleep_time and ignor 302 gc_urgent_sleep_time and ignores I/O idling check. uses greedy
311 GC approach and turns SSR mode 303 GC approach and turns SSR mode on.
312 gc urgent low(2): lowers the b 304 gc urgent low(2): lowers the bar of checking I/O idling in
313 order to process outstanding d 305 order to process outstanding discard commands and GC a
314 little bit aggressively. uses 306 little bit aggressively. uses cost benefit GC approach.
315 gc urgent mid(3): does GC forc 307 gc urgent mid(3): does GC forcibly in a period of given
316 gc_urgent_sleep_time and execu 308 gc_urgent_sleep_time and executes a mid level of I/O idling check.
317 uses cost benefit GC approach. 309 uses cost benefit GC approach.
318 310
319 What: /sys/fs/f2fs/<disk>/gc_urgent_ 311 What: /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
320 Date: August 2017 312 Date: August 2017
321 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 313 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
322 Description: Controls sleep time of GC urge 314 Description: Controls sleep time of GC urgent mode. Set to 500ms by default.
323 315
324 What: /sys/fs/f2fs/<disk>/readdir_ra 316 What: /sys/fs/f2fs/<disk>/readdir_ra
325 Date: November 2017 317 Date: November 2017
326 Contact: "Sheng Yong" <shengyong1@huawei 318 Contact: "Sheng Yong" <shengyong1@huawei.com>
327 Description: Controls readahead inode block 319 Description: Controls readahead inode block in readdir. Enabled by default.
328 320
329 What: /sys/fs/f2fs/<disk>/gc_pin_fil 321 What: /sys/fs/f2fs/<disk>/gc_pin_file_thresh
330 Date: January 2018 322 Date: January 2018
331 Contact: Jaegeuk Kim <jaegeuk@kernel.org 323 Contact: Jaegeuk Kim <jaegeuk@kernel.org>
332 Description: This indicates how many GC can 324 Description: This indicates how many GC can be failed for the pinned
333 file. If it exceeds this, F2FS 325 file. If it exceeds this, F2FS doesn't guarantee its pinning
334 state. 2048 trials is set by d !! 326 state. 2048 trials is set by default.
335 327
336 What: /sys/fs/f2fs/<disk>/extension_ 328 What: /sys/fs/f2fs/<disk>/extension_list
337 Date: February 2018 !! 329 Date: Feburary 2018
338 Contact: "Chao Yu" <yuchao0@huawei.com> 330 Contact: "Chao Yu" <yuchao0@huawei.com>
339 Description: Used to control configure exte 331 Description: Used to control configure extension list:
340 - Query: cat /sys/fs/f2fs/<dis 332 - Query: cat /sys/fs/f2fs/<disk>/extension_list
341 - Add: echo '[h/c]extension' > 333 - Add: echo '[h/c]extension' > /sys/fs/f2fs/<disk>/extension_list
342 - Del: echo '[h/c]!extension' 334 - Del: echo '[h/c]!extension' > /sys/fs/f2fs/<disk>/extension_list
343 - [h] means add/del hot file e 335 - [h] means add/del hot file extension
344 - [c] means add/del cold file 336 - [c] means add/del cold file extension
345 337
346 What: /sys/fs/f2fs/<disk>/unusable 338 What: /sys/fs/f2fs/<disk>/unusable
347 Date April 2019 339 Date April 2019
348 Contact: "Daniel Rosenberg" <drosen@goog 340 Contact: "Daniel Rosenberg" <drosen@google.com>
349 Description: If checkpoint=disable, it disp 341 Description: If checkpoint=disable, it displays the number of blocks that
350 are unusable. 342 are unusable.
351 If checkpoint=enable it displa 343 If checkpoint=enable it displays the number of blocks that
352 would be unusable if checkpoin 344 would be unusable if checkpoint=disable were to be set.
353 345
354 What: /sys/fs/f2fs/<disk>/encoding 346 What: /sys/fs/f2fs/<disk>/encoding
355 Date July 2019 347 Date July 2019
356 Contact: "Daniel Rosenberg" <drosen@goog 348 Contact: "Daniel Rosenberg" <drosen@google.com>
357 Description: Displays name and version of t 349 Description: Displays name and version of the encoding set for the filesystem.
358 If no encoding is set, display 350 If no encoding is set, displays (none)
359 351
360 What: /sys/fs/f2fs/<disk>/free_segme 352 What: /sys/fs/f2fs/<disk>/free_segments
361 Date: September 2019 353 Date: September 2019
362 Contact: "Hridya Valsaraju" <hridya@goog 354 Contact: "Hridya Valsaraju" <hridya@google.com>
363 Description: Number of free segments in dis 355 Description: Number of free segments in disk.
364 356
365 What: /sys/fs/f2fs/<disk>/cp_foregro 357 What: /sys/fs/f2fs/<disk>/cp_foreground_calls
366 Date: September 2019 358 Date: September 2019
367 Contact: "Hridya Valsaraju" <hridya@goog 359 Contact: "Hridya Valsaraju" <hridya@google.com>
368 Description: Number of checkpoint operation 360 Description: Number of checkpoint operations performed on demand. Available when
369 CONFIG_F2FS_STAT_FS=y. 361 CONFIG_F2FS_STAT_FS=y.
370 362
371 What: /sys/fs/f2fs/<disk>/cp_backgro 363 What: /sys/fs/f2fs/<disk>/cp_background_calls
372 Date: September 2019 364 Date: September 2019
373 Contact: "Hridya Valsaraju" <hridya@goog 365 Contact: "Hridya Valsaraju" <hridya@google.com>
374 Description: Number of checkpoint operation 366 Description: Number of checkpoint operations performed in the background to
375 free segments. Available when 367 free segments. Available when CONFIG_F2FS_STAT_FS=y.
376 368
377 What: /sys/fs/f2fs/<disk>/gc_foregro 369 What: /sys/fs/f2fs/<disk>/gc_foreground_calls
378 Date: September 2019 370 Date: September 2019
379 Contact: "Hridya Valsaraju" <hridya@goog 371 Contact: "Hridya Valsaraju" <hridya@google.com>
380 Description: Number of garbage collection o 372 Description: Number of garbage collection operations performed on demand.
381 Available when CONFIG_F2FS_STA 373 Available when CONFIG_F2FS_STAT_FS=y.
382 374
383 What: /sys/fs/f2fs/<disk>/gc_backgro 375 What: /sys/fs/f2fs/<disk>/gc_background_calls
384 Date: September 2019 376 Date: September 2019
385 Contact: "Hridya Valsaraju" <hridya@goog 377 Contact: "Hridya Valsaraju" <hridya@google.com>
386 Description: Number of garbage collection o 378 Description: Number of garbage collection operations triggered in background.
387 Available when CONFIG_F2FS_STA 379 Available when CONFIG_F2FS_STAT_FS=y.
388 380
389 What: /sys/fs/f2fs/<disk>/moved_bloc 381 What: /sys/fs/f2fs/<disk>/moved_blocks_foreground
390 Date: September 2019 382 Date: September 2019
391 Contact: "Hridya Valsaraju" <hridya@goog 383 Contact: "Hridya Valsaraju" <hridya@google.com>
392 Description: Number of blocks moved by garb 384 Description: Number of blocks moved by garbage collection in foreground.
393 Available when CONFIG_F2FS_STA 385 Available when CONFIG_F2FS_STAT_FS=y.
394 386
395 What: /sys/fs/f2fs/<disk>/moved_bloc 387 What: /sys/fs/f2fs/<disk>/moved_blocks_background
396 Date: September 2019 388 Date: September 2019
397 Contact: "Hridya Valsaraju" <hridya@goog 389 Contact: "Hridya Valsaraju" <hridya@google.com>
398 Description: Number of blocks moved by garb 390 Description: Number of blocks moved by garbage collection in background.
399 Available when CONFIG_F2FS_STA 391 Available when CONFIG_F2FS_STAT_FS=y.
400 392
401 What: /sys/fs/f2fs/<disk>/avg_vblock 393 What: /sys/fs/f2fs/<disk>/avg_vblocks
402 Date: September 2019 394 Date: September 2019
403 Contact: "Hridya Valsaraju" <hridya@goog 395 Contact: "Hridya Valsaraju" <hridya@google.com>
404 Description: Average number of valid blocks 396 Description: Average number of valid blocks.
405 Available when CONFIG_F2FS_STA 397 Available when CONFIG_F2FS_STAT_FS=y.
406 398
407 What: /sys/fs/f2fs/<disk>/mounted_ti 399 What: /sys/fs/f2fs/<disk>/mounted_time_sec
408 Date: February 2020 400 Date: February 2020
409 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 401 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
410 Description: Show the mounted time in secs 402 Description: Show the mounted time in secs of this partition.
411 403
412 What: /sys/fs/f2fs/<disk>/data_io_fl 404 What: /sys/fs/f2fs/<disk>/data_io_flag
413 Date: April 2020 405 Date: April 2020
414 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 406 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
415 Description: Give a way to attach REQ_META| 407 Description: Give a way to attach REQ_META|FUA to data writes
416 given temperature-based bits. 408 given temperature-based bits. Now the bits indicate:
417 409
418 +-------------------+--------- 410 +-------------------+-------------------+
419 | REQ_META | REQ 411 | REQ_META | REQ_FUA |
420 +------+------+-----+------+-- 412 +------+------+-----+------+------+-----+
421 | 5 | 4 | 3 | 2 | 413 | 5 | 4 | 3 | 2 | 1 | 0 |
422 +------+------+-----+------+-- 414 +------+------+-----+------+------+-----+
423 | Cold | Warm | Hot | Cold | W 415 | Cold | Warm | Hot | Cold | Warm | Hot |
424 +------+------+-----+------+-- 416 +------+------+-----+------+------+-----+
425 417
426 What: /sys/fs/f2fs/<disk>/node_io_fl 418 What: /sys/fs/f2fs/<disk>/node_io_flag
427 Date: June 2020 419 Date: June 2020
428 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 420 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
429 Description: Give a way to attach REQ_META| 421 Description: Give a way to attach REQ_META|FUA to node writes
430 given temperature-based bits. 422 given temperature-based bits. Now the bits indicate:
431 423
432 +-------------------+--------- 424 +-------------------+-------------------+
433 | REQ_META | REQ 425 | REQ_META | REQ_FUA |
434 +------+------+-----+------+-- 426 +------+------+-----+------+------+-----+
435 | 5 | 4 | 3 | 2 | 427 | 5 | 4 | 3 | 2 | 1 | 0 |
436 +------+------+-----+------+-- 428 +------+------+-----+------+------+-----+
437 | Cold | Warm | Hot | Cold | W 429 | Cold | Warm | Hot | Cold | Warm | Hot |
438 +------+------+-----+------+-- 430 +------+------+-----+------+------+-----+
439 431
440 What: /sys/fs/f2fs/<disk>/iostat_per 432 What: /sys/fs/f2fs/<disk>/iostat_period_ms
441 Date: April 2020 433 Date: April 2020
442 Contact: "Daeho Jeong" <daehojeong@googl 434 Contact: "Daeho Jeong" <daehojeong@google.com>
443 Description: Give a way to change iostat_pe 435 Description: Give a way to change iostat_period time. 3secs by default.
444 The new iostat trace gives sta 436 The new iostat trace gives stats gap given the period.
445 What: /sys/fs/f2fs/<disk>/max_io_byt 437 What: /sys/fs/f2fs/<disk>/max_io_bytes
446 Date: December 2020 438 Date: December 2020
447 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 439 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
448 Description: This gives a control to limit 440 Description: This gives a control to limit the bio size in f2fs.
449 Default is zero, which will fo 441 Default is zero, which will follow underlying block layer limit,
450 whereas, if it has a certain b 442 whereas, if it has a certain bytes value, f2fs won't submit a
451 bio larger than that size. 443 bio larger than that size.
452 444
453 What: /sys/fs/f2fs/<disk>/stat/sb_st 445 What: /sys/fs/f2fs/<disk>/stat/sb_status
454 Date: December 2020 446 Date: December 2020
455 Contact: "Chao Yu" <yuchao0@huawei.com> 447 Contact: "Chao Yu" <yuchao0@huawei.com>
456 Description: Show status of f2fs superblock 448 Description: Show status of f2fs superblock in real time.
457 449
458 ====== ===================== = 450 ====== ===================== =================================
459 value sb status macro d 451 value sb status macro description
460 0x1 SBI_IS_DIRTY d 452 0x1 SBI_IS_DIRTY dirty flag for checkpoint
461 0x2 SBI_IS_CLOSE s 453 0x2 SBI_IS_CLOSE specify unmounting
462 0x4 SBI_NEED_FSCK n 454 0x4 SBI_NEED_FSCK need fsck.f2fs to fix
463 0x8 SBI_POR_DOING r 455 0x8 SBI_POR_DOING recovery is doing or not
464 0x10 SBI_NEED_SB_WRITE n 456 0x10 SBI_NEED_SB_WRITE need to recover superblock
465 0x20 SBI_NEED_CP n 457 0x20 SBI_NEED_CP need to checkpoint
466 0x40 SBI_IS_SHUTDOWN s 458 0x40 SBI_IS_SHUTDOWN shutdown by ioctl
467 0x80 SBI_IS_RECOVERED r 459 0x80 SBI_IS_RECOVERED recovered orphan/data
468 0x100 SBI_CP_DISABLED C 460 0x100 SBI_CP_DISABLED CP was disabled last mount
469 0x200 SBI_CP_DISABLED_QUICK C 461 0x200 SBI_CP_DISABLED_QUICK CP was disabled quickly
470 0x400 SBI_QUOTA_NEED_FLUSH n 462 0x400 SBI_QUOTA_NEED_FLUSH need to flush quota info in CP
471 0x800 SBI_QUOTA_SKIP_FLUSH s 463 0x800 SBI_QUOTA_SKIP_FLUSH skip flushing quota in current CP
472 0x1000 SBI_QUOTA_NEED_REPAIR q 464 0x1000 SBI_QUOTA_NEED_REPAIR quota file may be corrupted
473 0x2000 SBI_IS_RESIZEFS r 465 0x2000 SBI_IS_RESIZEFS resizefs is in process
474 0x4000 SBI_IS_FREEZING f 466 0x4000 SBI_IS_FREEZING freefs is in process
475 ====== ===================== = 467 ====== ===================== =================================
476 468
477 What: /sys/fs/f2fs/<disk>/stat/cp_st <<
478 Date: September 2022 <<
479 Contact: "Chao Yu" <chao.yu@oppo.com> <<
480 Description: Show status of f2fs checkpoint <<
481 <<
482 ============================== <<
483 cp flag <<
484 CP_UMOUNT_FLAG <<
485 CP_ORPHAN_PRESENT_FLAG <<
486 CP_COMPACT_SUM_FLAG <<
487 CP_ERROR_FLAG <<
488 CP_FSCK_FLAG <<
489 CP_FASTBOOT_FLAG <<
490 CP_CRC_RECOVERY_FLAG <<
491 CP_NAT_BITS_FLAG <<
492 CP_TRIMMED_FLAG <<
493 CP_NOCRC_RECOVERY_FLAG <<
494 CP_LARGE_NAT_BITMAP_FLAG <<
495 CP_QUOTA_NEED_FSCK_FLAG <<
496 CP_DISABLED_FLAG <<
497 CP_DISABLED_QUICK_FLAG <<
498 CP_RESIZEFS_FLAG <<
499 ============================== <<
500 <<
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 469 What: /sys/fs/f2fs/<disk>/ckpt_thread_ioprio
517 Date: January 2021 470 Date: January 2021
518 Contact: "Daeho Jeong" <daehojeong@googl 471 Contact: "Daeho Jeong" <daehojeong@google.com>
519 Description: Give a way to change checkpoin 472 Description: Give a way to change checkpoint merge daemon's io priority.
520 Its default value is "be,3", w 473 Its default value is "be,3", which means "BE" I/O class and
521 I/O priority "3". We can selec 474 I/O priority "3". We can select the class between "rt" and "be",
522 and set the I/O priority withi 475 and set the I/O priority within valid range of it. "," delimiter
523 is necessary in between I/O cl 476 is necessary in between I/O class and priority number.
524 477
525 What: /sys/fs/f2fs/<disk>/ovp_segmen 478 What: /sys/fs/f2fs/<disk>/ovp_segments
526 Date: March 2021 479 Date: March 2021
527 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 480 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
528 Description: Shows the number of overprovis 481 Description: Shows the number of overprovision segments.
529 482
530 What: /sys/fs/f2fs/<disk>/compr_writ 483 What: /sys/fs/f2fs/<disk>/compr_written_block
531 Date: March 2021 484 Date: March 2021
532 Contact: "Daeho Jeong" <daehojeong@googl 485 Contact: "Daeho Jeong" <daehojeong@google.com>
533 Description: Show the block count written a 486 Description: Show the block count written after compression since mount. Note
534 that when the compressed block 487 that when the compressed blocks are deleted, this count doesn't
535 decrease. If you write "0" her 488 decrease. If you write "0" here, you can initialize
536 compr_written_block and compr_ 489 compr_written_block and compr_saved_block to "0".
537 490
538 What: /sys/fs/f2fs/<disk>/compr_save 491 What: /sys/fs/f2fs/<disk>/compr_saved_block
539 Date: March 2021 492 Date: March 2021
540 Contact: "Daeho Jeong" <daehojeong@googl 493 Contact: "Daeho Jeong" <daehojeong@google.com>
541 Description: Show the saved block count wit 494 Description: Show the saved block count with compression since mount. Note
542 that when the compressed block 495 that when the compressed blocks are deleted, this count doesn't
543 decrease. If you write "0" her 496 decrease. If you write "0" here, you can initialize
544 compr_written_block and compr_ 497 compr_written_block and compr_saved_block to "0".
545 498
546 What: /sys/fs/f2fs/<disk>/compr_new_ 499 What: /sys/fs/f2fs/<disk>/compr_new_inode
547 Date: March 2021 500 Date: March 2021
548 Contact: "Daeho Jeong" <daehojeong@googl 501 Contact: "Daeho Jeong" <daehojeong@google.com>
549 Description: Show the count of inode newly 502 Description: Show the count of inode newly enabled for compression since mount.
550 Note that when the compression 503 Note that when the compression is disabled for the files, this count
551 doesn't decrease. If you write 504 doesn't decrease. If you write "0" here, you can initialize
552 compr_new_inode to "0". 505 compr_new_inode to "0".
553 506
554 What: /sys/fs/f2fs/<disk>/atgc_candi 507 What: /sys/fs/f2fs/<disk>/atgc_candidate_ratio
555 Date: May 2021 508 Date: May 2021
556 Contact: "Chao Yu" <yuchao0@huawei.com> 509 Contact: "Chao Yu" <yuchao0@huawei.com>
557 Description: When ATGC is on, it controls c 510 Description: When ATGC is on, it controls candidate ratio in order to limit total
558 number of potential victim in 511 number of potential victim in all candidates, the value should be in
559 range of [0, 100], by default 512 range of [0, 100], by default it was initialized as 20(%).
560 513
561 What: /sys/fs/f2fs/<disk>/atgc_candi 514 What: /sys/fs/f2fs/<disk>/atgc_candidate_count
562 Date: May 2021 515 Date: May 2021
563 Contact: "Chao Yu" <yuchao0@huawei.com> 516 Contact: "Chao Yu" <yuchao0@huawei.com>
564 Description: When ATGC is on, it controls c 517 Description: When ATGC is on, it controls candidate count in order to limit total
565 number of potential victim in 518 number of potential victim in all candidates, by default it was
566 initialized as 10 (sections). 519 initialized as 10 (sections).
567 520
568 What: /sys/fs/f2fs/<disk>/atgc_age_w 521 What: /sys/fs/f2fs/<disk>/atgc_age_weight
569 Date: May 2021 522 Date: May 2021
570 Contact: "Chao Yu" <yuchao0@huawei.com> 523 Contact: "Chao Yu" <yuchao0@huawei.com>
571 Description: When ATGC is on, it controls a 524 Description: When ATGC is on, it controls age weight to balance weight proportion
572 in between aging and valid blo 525 in between aging and valid blocks, the value should be in range of
573 [0, 100], by default it was in 526 [0, 100], by default it was initialized as 60(%).
574 527
575 What: /sys/fs/f2fs/<disk>/atgc_age_t 528 What: /sys/fs/f2fs/<disk>/atgc_age_threshold
576 Date: May 2021 529 Date: May 2021
577 Contact: "Chao Yu" <yuchao0@huawei.com> 530 Contact: "Chao Yu" <yuchao0@huawei.com>
578 Description: When ATGC is on, it controls a 531 Description: When ATGC is on, it controls age threshold to bypass GCing young
579 candidates whose age is not be 532 candidates whose age is not beyond the threshold, by default it was
580 initialized as 604800 seconds 533 initialized as 604800 seconds (equals to 7 days).
581 534
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 535 What: /sys/fs/f2fs/<disk>/gc_reclaimed_segments
589 Date: July 2021 536 Date: July 2021
590 Contact: "Daeho Jeong" <daehojeong@googl 537 Contact: "Daeho Jeong" <daehojeong@google.com>
591 Description: Show how many segments have be 538 Description: Show how many segments have been reclaimed by GC during a specific
592 GC mode (0: GC normal, 1: GC i 539 GC mode (0: GC normal, 1: GC idle CB, 2: GC idle greedy,
593 3: GC idle AT, 4: GC urgent hi 540 3: GC idle AT, 4: GC urgent high, 5: GC urgent low 6: GC urgent mid)
594 You can re-initialize this val 541 You can re-initialize this value to "0".
595 542
596 What: /sys/fs/f2fs/<disk>/gc_segment 543 What: /sys/fs/f2fs/<disk>/gc_segment_mode
597 Date: July 2021 544 Date: July 2021
598 Contact: "Daeho Jeong" <daehojeong@googl 545 Contact: "Daeho Jeong" <daehojeong@google.com>
599 Description: You can control for which gc m 546 Description: You can control for which gc mode the "gc_reclaimed_segments" node shows.
600 Refer to the description of th 547 Refer to the description of the modes in "gc_reclaimed_segments".
601 548
602 What: /sys/fs/f2fs/<disk>/seq_file_r 549 What: /sys/fs/f2fs/<disk>/seq_file_ra_mul
603 Date: July 2021 550 Date: July 2021
604 Contact: "Daeho Jeong" <daehojeong@googl 551 Contact: "Daeho Jeong" <daehojeong@google.com>
605 Description: You can control the multiplier 552 Description: You can control the multiplier value of bdi device readahead window size
606 between 2 (default) and 256 fo 553 between 2 (default) and 256 for POSIX_FADV_SEQUENTIAL advise option.
607 554
608 What: /sys/fs/f2fs/<disk>/max_fragme 555 What: /sys/fs/f2fs/<disk>/max_fragment_chunk
609 Date: August 2021 556 Date: August 2021
610 Contact: "Daeho Jeong" <daehojeong@googl 557 Contact: "Daeho Jeong" <daehojeong@google.com>
611 Description: With "mode=fragment:block" mou 558 Description: With "mode=fragment:block" mount options, we can scatter block allocation.
612 f2fs will allocate 1..<max_fra 559 f2fs will allocate 1..<max_fragment_chunk> blocks in a chunk and make a hole
613 in the length of 1..<max_fragm 560 in the length of 1..<max_fragment_hole> by turns. This value can be set
614 between 1..512 and the default 561 between 1..512 and the default value is 4.
615 562
616 What: /sys/fs/f2fs/<disk>/max_fragme 563 What: /sys/fs/f2fs/<disk>/max_fragment_hole
617 Date: August 2021 564 Date: August 2021
618 Contact: "Daeho Jeong" <daehojeong@googl 565 Contact: "Daeho Jeong" <daehojeong@google.com>
619 Description: With "mode=fragment:block" mou 566 Description: With "mode=fragment:block" mount options, we can scatter block allocation.
620 f2fs will allocate 1..<max_fra 567 f2fs will allocate 1..<max_fragment_chunk> blocks in a chunk and make a hole
621 in the length of 1..<max_fragm 568 in the length of 1..<max_fragment_hole> by turns. This value can be set
622 between 1..512 and the default 569 between 1..512 and the default value is 4.
623 570
624 What: /sys/fs/f2fs/<disk>/gc_remaini !! 571 What: /sys/fs/f2fs/<disk>/gc_urgent_high_remaining
625 Date: October 2022 !! 572 Date: December 2021
626 Contact: "Yangtao Li" <frank.li@vivo.com !! 573 Contact: "Daeho Jeong" <daehojeong@google.com>
627 Description: You can set the trial count li !! 574 Description: You can set the trial count limit for GC urgent high mode with this value.
628 If GC thread gets to the limit 575 If GC thread gets to the limit, the mode will turn back to GC normal mode.
629 By default, the value is zero, 576 By default, the value is zero, which means there is no limit like before.
630 577
631 What: /sys/fs/f2fs/<disk>/max_roll_f 578 What: /sys/fs/f2fs/<disk>/max_roll_forward_node_blocks
632 Date: January 2022 579 Date: January 2022
633 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 580 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
634 Description: Controls max # of node block w 581 Description: Controls max # of node block writes to be used for roll forward
635 recovery. This can limit the r 582 recovery. This can limit the roll forward recovery time.
636 583
637 What: /sys/fs/f2fs/<disk>/unusable_b 584 What: /sys/fs/f2fs/<disk>/unusable_blocks_per_sec
638 Date: June 2022 585 Date: June 2022
639 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o 586 Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
640 Description: Shows the number of unusable b 587 Description: Shows the number of unusable blocks in a section which was defined by
641 the zone capacity reported by 588 the zone capacity reported by underlying zoned device.
642 589
643 What: /sys/fs/f2fs/<disk>/current_at 590 What: /sys/fs/f2fs/<disk>/current_atomic_write
644 Date: July 2022 591 Date: July 2022
645 Contact: "Daeho Jeong" <daehojeong@googl 592 Contact: "Daeho Jeong" <daehojeong@google.com>
646 Description: Show the total current atomic 593 Description: Show the total current atomic write block count, which is not committed yet.
647 This is a read-only entry. 594 This is a read-only entry.
648 595
649 What: /sys/fs/f2fs/<disk>/peak_atomi 596 What: /sys/fs/f2fs/<disk>/peak_atomic_write
650 Date: July 2022 597 Date: July 2022
651 Contact: "Daeho Jeong" <daehojeong@googl 598 Contact: "Daeho Jeong" <daehojeong@google.com>
652 Description: Show the peak value of total c 599 Description: Show the peak value of total current atomic write block count after boot.
653 If you write "0" here, you can 600 If you write "0" here, you can initialize to "0".
654 601
655 What: /sys/fs/f2fs/<disk>/committed_ 602 What: /sys/fs/f2fs/<disk>/committed_atomic_block
656 Date: July 2022 603 Date: July 2022
657 Contact: "Daeho Jeong" <daehojeong@googl 604 Contact: "Daeho Jeong" <daehojeong@google.com>
658 Description: Show the accumulated total com 605 Description: Show the accumulated total committed atomic write block count after boot.
659 If you write "0" here, you can 606 If you write "0" here, you can initialize to "0".
660 607
661 What: /sys/fs/f2fs/<disk>/revoked_at 608 What: /sys/fs/f2fs/<disk>/revoked_atomic_block
662 Date: July 2022 609 Date: July 2022
663 Contact: "Daeho Jeong" <daehojeong@googl 610 Contact: "Daeho Jeong" <daehojeong@google.com>
664 Description: Show the accumulated total rev 611 Description: Show the accumulated total revoked atomic write block count after boot.
665 If you write "0" here, you can 612 If you write "0" here, you can initialize to "0".
666 <<
667 What: /sys/fs/f2fs/<disk>/gc_mode <<
668 Date: October 2022 <<
669 Contact: "Yangtao Li" <frank.li@vivo.com <<
670 Description: Show the current gc_mode as a <<
671 This is a read-only entry. <<
672 <<
673 What: /sys/fs/f2fs/<disk>/discard_ur <<
674 Date: November 2022 <<
675 Contact: "Yangtao Li" <frank.li@vivo.com <<
676 Description: When space utilization exceeds <<
677 Does DISCARD forcibly in a per <<
678 of discards is not 0 and set d <<
679 Default: 80 <<
680 <<
681 What: /sys/fs/f2fs/<disk>/hot_data_a <<
682 Date: November 2022 <<
683 Contact: "Ping Xiong" <xiongping1@xiaomi <<
684 Description: When DATA SEPARATION is on, it <<
685 the data blocks as hot. By def <<
686 (equals to 1GB). <<
687 <<
688 What: /sys/fs/f2fs/<disk>/warm_data_ <<
689 Date: November 2022 <<
690 Contact: "Ping Xiong" <xiongping1@xiaomi <<
691 Description: When DATA SEPARATION is on, it <<
692 the data blocks as warm. By de <<
693 (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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