1 What: /sys/fs/f2fs/<disk>/gc_max_sle
2 Date: July 2013
3 Contact: "Namjae Jeon" <namjae.jeon@sams
4 Description: Controls the maximum sleep tim
5 is in milliseconds.
6
7 What: /sys/fs/f2fs/<disk>/gc_min_sle
8 Date: July 2013
9 Contact: "Namjae Jeon" <namjae.jeon@sams
10 Description: Controls the minimum sleep tim
11 is in milliseconds.
12
13 What: /sys/fs/f2fs/<disk>/gc_no_gc_s
14 Date: July 2013
15 Contact: "Namjae Jeon" <namjae.jeon@sams
16 Description: Controls the default sleep tim
17 is in milliseconds.
18
19 What: /sys/fs/f2fs/<disk>/gc_idle
20 Date: July 2013
21 Contact: "Namjae Jeon" <namjae.jeon@sams
22 Description: Controls the victim selection
23 Setting gc_idle = 0(default) w
24
25 =========== =================
26 gc_idle = 1 will select the C
27 gc_idle = 2 will select the g
28 gc_idle = 3 will select the a
29 =========== =================
30
31 What: /sys/fs/f2fs/<disk>/reclaim_se
32 Date: October 2013
33 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams
34 Description: This parameter controls the nu
35 reclaimed. If the number of pr
36 the number of segments in the
37 over total volume size, f2fs t
38 reclaim the prefree segments t
39 By default, 5% over total # of
40
41 What: /sys/fs/f2fs/<disk>/main_blkad
42 Date: November 2019
43 Contact: "Ramon Pantin" <pantin@google.c
44 Description: Shows first block address of M
45
46 What: /sys/fs/f2fs/<disk>/ipu_policy
47 Date: November 2013
48 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams
49 Description: Controls the in-place-update p
50 updates in f2fs. User can set:
51
52 ===== =============== ========
53 value policy descript
54 0x00 DISABLE disable
55 0x01 FORCE all the
56 0x02 SSR if SSR m
57 0x04 UTIL if FS ut
58 0x08 SSR_UTIL if SSR m
59 threshol
60 0x10 FSYNC activate
61 flash st
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
70 Refer segment.h for details.
71
72 What: /sys/fs/f2fs/<disk>/min_ipu_ut
73 Date: November 2013
74 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams
75 Description: Controls the FS utilization co
76 policies. It is used by F2FS_I
77
78 What: /sys/fs/f2fs/<disk>/min_fsync_
79 Date: September 2014
80 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
81 Description: Controls the dirty page count
82 policies.
83
84 What: /sys/fs/f2fs/<disk>/min_seq_bl
85 Date: August 2018
86 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
87 Description: Controls the dirty page count
88 writes in writepages.
89
90 What: /sys/fs/f2fs/<disk>/min_hot_bl
91 Date: March 2017
92 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
93 Description: Controls the dirty page count
94
95 What: /sys/fs/f2fs/<disk>/min_ssr_se
96 Date: October 2017
97 Contact: "Chao Yu" <yuchao0@huawei.com>
98 Description: Controls the free section thre
99 If this is large, SSR mode wil
100
101 What: /sys/fs/f2fs/<disk>/max_small_
102 Date: November 2013
103 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams
104 Description: Controls the issue rate of dis
105 blocks less than 2MB. The cand
106 checkpoint, and issued by issu
107 It is enabled by default.
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
115 What: /sys/fs/f2fs/<disk>/max_discar
116 Date: December 2021
117 Contact: "Konstantin Vyshetsky" <vkon@go
118 Description: Controls the number of discard
119 Higher number will allow the d
120 faster, at the cost of higher
121
122 What: /sys/fs/f2fs/<disk>/min_discar
123 Date: December 2021
124 Contact: "Konstantin Vyshetsky" <vkon@go
125 Description: Controls the interval the disc
126 issuing discard requests when
127 no I/O aware interruptions occ
128
129 What: /sys/fs/f2fs/<disk>/mid_discar
130 Date: December 2021
131 Contact: "Konstantin Vyshetsky" <vkon@go
132 Description: Controls the interval the disc
133 issuing discard requests when
134 an I/O aware interruption occu
135
136 What: /sys/fs/f2fs/<disk>/max_discar
137 Date: December 2021
138 Contact: "Konstantin Vyshetsky" <vkon@go
139 Description: Controls the interval the disc
140 no discard operations to be is
141
142 What: /sys/fs/f2fs/<disk>/discard_gr
143 Date: July 2017
144 Contact: "Chao Yu" <yuchao0@huawei.com>
145 Description: Controls discard granularity o
146 will not issue discards with s
147 The unit size is one block(4KB
148 in range of [1, 512]. Default
149 For small devices, default val
150
151 What: /sys/fs/f2fs/<disk>/umount_dis
152 Date: January 2019
153 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
154 Description: Set timeout to issue discard c
155 Default: 5 secs
156
157 What: /sys/fs/f2fs/<disk>/pending_di
158 Date: November 2021
159 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
160 Description: Shows the number of pending di
161
162 What: /sys/fs/f2fs/<disk>/max_victim
163 Date: January 2014
164 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams
165 Description: Controls the number of trials
166 when conducting SSR and cleani
167 is 4096 which covers 8GB block
168
169 What: /sys/fs/f2fs/<disk>/migration_
170 Date: October 2018
171 Contact: "Chao Yu" <yuchao0@huawei.com>
172 Description: Controls migration granularity
173 section, it can let GC move pa
174 in one GC cycle, so that dispe
175 multiple lightweight one.
176
177 What: /sys/fs/f2fs/<disk>/dir_level
178 Date: March 2014
179 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams
180 Description: Controls the directory level f
181 directory has a number of file
182 latency by increasing this dir
183 needs to decrease this value t
184 The default value is 0.
185
186 What: /sys/fs/f2fs/<disk>/ram_thresh
187 Date: March 2014
188 Contact: "Jaegeuk Kim" <jaegeuk.kim@sams
189 Description: Controls the memory footprint
190 nat entries. By default, 1 is
191 10 MB / 1 GB RAM.
192
193 What: /sys/fs/f2fs/<disk>/cp_interva
194 Date: October 2015
195 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
196 Description: Controls the checkpoint timing
197
198 What: /sys/fs/f2fs/<disk>/idle_inter
199 Date: January 2016
200 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
201 Description: Controls the idle timing of sy
202 during given interval.
203 Set to 5 seconds by default.
204
205 What: /sys/fs/f2fs/<disk>/discard_id
206 Date: September 2018
207 Contact: "Chao Yu" <yuchao0@huawei.com>
208 Contact: "Sahitya Tummala" <quic_stummal
209 Description: Controls the idle timing of di
210 this time interval.
211 Default is 5 secs.
212
213 What: /sys/fs/f2fs/<disk>/gc_idle_in
214 Date: September 2018
215 Contact: "Chao Yu" <yuchao0@huawei.com>
216 Contact: "Sahitya Tummala" <quic_stummal
217 Description: Controls the idle timing for g
218
219 What: /sys/fs/f2fs/<disk>/iostat_ena
220 Date: August 2017
221 Contact: "Chao Yu" <yuchao0@huawei.com>
222 Description: Controls to enable/disable IO
223
224 What: /sys/fs/f2fs/<disk>/ra_nid_pag
225 Date: October 2015
226 Contact: "Chao Yu" <chao2.yu@samsung.com
227 Description: Controls the count of nid page
228 When building free nids, F2FS
229 speed up. Default is 0.
230
231 What: /sys/fs/f2fs/<disk>/dirty_nats
232 Date: January 2016
233 Contact: "Chao Yu" <chao2.yu@samsung.com
234 Description: Controls dirty nat entries rat
235 ratio exceeds configured thres
236 be triggered for flushing dirt
237
238 What: /sys/fs/f2fs/<disk>/lifetime_w
239 Date: January 2016
240 Contact: "Shuoran Liu" <liushuoran@huawe
241 Description: Shows total written kbytes iss
242
243 What: /sys/fs/f2fs/<disk>/features
244 Date: July 2017
245 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
246 Description: <deprecated: should use /sys/f
247 Shows all enabled features in
248 Supported features:
249 encryption, blkzoned, extra_at
250 flexible_inline_xattr, quota_i
251 verity, sb_checksum, casefold,
252
253 What: /sys/fs/f2fs/<disk>/feature_li
254 Date: June 2021
255 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
256 Description: Expand /sys/fs/f2fs/<disk>/fea
257 Supported on-disk features:
258 encryption, block_zoned (aka b
259 project_quota (aka projquota),
260 flexible_inline_xattr, quota_i
261 verity, sb_checksum, casefold,
262 Note that, pin_file is moved i
263
264 What: /sys/fs/f2fs/features/
265 Date: July 2017
266 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
267 Description: Shows all enabled kernel featu
268 Supported features:
269 encryption, block_zoned, extra
270 inode_checksum, flexible_inlin
271 inode_crtime, lost_found, veri
272 casefold, readonly, compressio
273 atomic_write, pin_file, encryp
274
275 What: /sys/fs/f2fs/<disk>/inject_rat
276 Date: May 2016
277 Contact: "Sheng Yong" <shengyong1@huawei
278 Description: Controls the injection rate of
279
280 What: /sys/fs/f2fs/<disk>/inject_typ
281 Date: May 2016
282 Contact: "Sheng Yong" <shengyong1@huawei
283 Description: Controls the injection type of
284
285 What: /sys/fs/f2fs/<disk>/dirty_segm
286 Date: October 2017
287 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
288 Description: Shows the number of dirty segm
289
290 What: /sys/fs/f2fs/<disk>/reserved_b
291 Date: June 2017
292 Contact: "Chao Yu" <yuchao0@huawei.com>
293 Description: Controls target reserved block
294 is soft, it could exceed curre
295
296 What: /sys/fs/f2fs/<disk>/current_re
297 Date: October 2017
298 Contact: "Yunlong Song" <yunlong.song@hu
299 Contact: "Chao Yu" <yuchao0@huawei.com>
300 Description: Shows current reserved blocks
301 smaller than target_reserved_b
302 increase to target_reserved_bl
303 freed by user later.
304
305 What: /sys/fs/f2fs/<disk>/gc_urgent
306 Date: August 2017
307 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
308 Description: Do background GC aggressively
309 gc urgent high(1): does GC for
310 gc_urgent_sleep_time and ignor
311 GC approach and turns SSR mode
312 gc urgent low(2): lowers the b
313 order to process outstanding d
314 little bit aggressively. uses
315 gc urgent mid(3): does GC forc
316 gc_urgent_sleep_time and execu
317 uses cost benefit GC approach.
318
319 What: /sys/fs/f2fs/<disk>/gc_urgent_
320 Date: August 2017
321 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
322 Description: Controls sleep time of GC urge
323
324 What: /sys/fs/f2fs/<disk>/readdir_ra
325 Date: November 2017
326 Contact: "Sheng Yong" <shengyong1@huawei
327 Description: Controls readahead inode block
328
329 What: /sys/fs/f2fs/<disk>/gc_pin_fil
330 Date: January 2018
331 Contact: Jaegeuk Kim <jaegeuk@kernel.org
332 Description: This indicates how many GC can
333 file. If it exceeds this, F2FS
334 state. 2048 trials is set by d
335
336 What: /sys/fs/f2fs/<disk>/extension_
337 Date: February 2018
338 Contact: "Chao Yu" <yuchao0@huawei.com>
339 Description: Used to control configure exte
340 - Query: cat /sys/fs/f2fs/<dis
341 - Add: echo '[h/c]extension' >
342 - Del: echo '[h/c]!extension'
343 - [h] means add/del hot file e
344 - [c] means add/del cold file
345
346 What: /sys/fs/f2fs/<disk>/unusable
347 Date April 2019
348 Contact: "Daniel Rosenberg" <drosen@goog
349 Description: If checkpoint=disable, it disp
350 are unusable.
351 If checkpoint=enable it displa
352 would be unusable if checkpoin
353
354 What: /sys/fs/f2fs/<disk>/encoding
355 Date July 2019
356 Contact: "Daniel Rosenberg" <drosen@goog
357 Description: Displays name and version of t
358 If no encoding is set, display
359
360 What: /sys/fs/f2fs/<disk>/free_segme
361 Date: September 2019
362 Contact: "Hridya Valsaraju" <hridya@goog
363 Description: Number of free segments in dis
364
365 What: /sys/fs/f2fs/<disk>/cp_foregro
366 Date: September 2019
367 Contact: "Hridya Valsaraju" <hridya@goog
368 Description: Number of checkpoint operation
369 CONFIG_F2FS_STAT_FS=y.
370
371 What: /sys/fs/f2fs/<disk>/cp_backgro
372 Date: September 2019
373 Contact: "Hridya Valsaraju" <hridya@goog
374 Description: Number of checkpoint operation
375 free segments. Available when
376
377 What: /sys/fs/f2fs/<disk>/gc_foregro
378 Date: September 2019
379 Contact: "Hridya Valsaraju" <hridya@goog
380 Description: Number of garbage collection o
381 Available when CONFIG_F2FS_STA
382
383 What: /sys/fs/f2fs/<disk>/gc_backgro
384 Date: September 2019
385 Contact: "Hridya Valsaraju" <hridya@goog
386 Description: Number of garbage collection o
387 Available when CONFIG_F2FS_STA
388
389 What: /sys/fs/f2fs/<disk>/moved_bloc
390 Date: September 2019
391 Contact: "Hridya Valsaraju" <hridya@goog
392 Description: Number of blocks moved by garb
393 Available when CONFIG_F2FS_STA
394
395 What: /sys/fs/f2fs/<disk>/moved_bloc
396 Date: September 2019
397 Contact: "Hridya Valsaraju" <hridya@goog
398 Description: Number of blocks moved by garb
399 Available when CONFIG_F2FS_STA
400
401 What: /sys/fs/f2fs/<disk>/avg_vblock
402 Date: September 2019
403 Contact: "Hridya Valsaraju" <hridya@goog
404 Description: Average number of valid blocks
405 Available when CONFIG_F2FS_STA
406
407 What: /sys/fs/f2fs/<disk>/mounted_ti
408 Date: February 2020
409 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
410 Description: Show the mounted time in secs
411
412 What: /sys/fs/f2fs/<disk>/data_io_fl
413 Date: April 2020
414 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
415 Description: Give a way to attach REQ_META|
416 given temperature-based bits.
417
418 +-------------------+---------
419 | REQ_META | REQ
420 +------+------+-----+------+--
421 | 5 | 4 | 3 | 2 |
422 +------+------+-----+------+--
423 | Cold | Warm | Hot | Cold | W
424 +------+------+-----+------+--
425
426 What: /sys/fs/f2fs/<disk>/node_io_fl
427 Date: June 2020
428 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
429 Description: Give a way to attach REQ_META|
430 given temperature-based bits.
431
432 +-------------------+---------
433 | REQ_META | REQ
434 +------+------+-----+------+--
435 | 5 | 4 | 3 | 2 |
436 +------+------+-----+------+--
437 | Cold | Warm | Hot | Cold | W
438 +------+------+-----+------+--
439
440 What: /sys/fs/f2fs/<disk>/iostat_per
441 Date: April 2020
442 Contact: "Daeho Jeong" <daehojeong@googl
443 Description: Give a way to change iostat_pe
444 The new iostat trace gives sta
445 What: /sys/fs/f2fs/<disk>/max_io_byt
446 Date: December 2020
447 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
448 Description: This gives a control to limit
449 Default is zero, which will fo
450 whereas, if it has a certain b
451 bio larger than that size.
452
453 What: /sys/fs/f2fs/<disk>/stat/sb_st
454 Date: December 2020
455 Contact: "Chao Yu" <yuchao0@huawei.com>
456 Description: Show status of f2fs superblock
457
458 ====== ===================== =
459 value sb status macro d
460 0x1 SBI_IS_DIRTY d
461 0x2 SBI_IS_CLOSE s
462 0x4 SBI_NEED_FSCK n
463 0x8 SBI_POR_DOING r
464 0x10 SBI_NEED_SB_WRITE n
465 0x20 SBI_NEED_CP n
466 0x40 SBI_IS_SHUTDOWN s
467 0x80 SBI_IS_RECOVERED r
468 0x100 SBI_CP_DISABLED C
469 0x200 SBI_CP_DISABLED_QUICK C
470 0x400 SBI_QUOTA_NEED_FLUSH n
471 0x800 SBI_QUOTA_SKIP_FLUSH s
472 0x1000 SBI_QUOTA_NEED_REPAIR q
473 0x2000 SBI_IS_RESIZEFS r
474 0x4000 SBI_IS_FREEZING f
475 ====== ===================== =
476
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
517 Date: January 2021
518 Contact: "Daeho Jeong" <daehojeong@googl
519 Description: Give a way to change checkpoin
520 Its default value is "be,3", w
521 I/O priority "3". We can selec
522 and set the I/O priority withi
523 is necessary in between I/O cl
524
525 What: /sys/fs/f2fs/<disk>/ovp_segmen
526 Date: March 2021
527 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
528 Description: Shows the number of overprovis
529
530 What: /sys/fs/f2fs/<disk>/compr_writ
531 Date: March 2021
532 Contact: "Daeho Jeong" <daehojeong@googl
533 Description: Show the block count written a
534 that when the compressed block
535 decrease. If you write "0" her
536 compr_written_block and compr_
537
538 What: /sys/fs/f2fs/<disk>/compr_save
539 Date: March 2021
540 Contact: "Daeho Jeong" <daehojeong@googl
541 Description: Show the saved block count wit
542 that when the compressed block
543 decrease. If you write "0" her
544 compr_written_block and compr_
545
546 What: /sys/fs/f2fs/<disk>/compr_new_
547 Date: March 2021
548 Contact: "Daeho Jeong" <daehojeong@googl
549 Description: Show the count of inode newly
550 Note that when the compression
551 doesn't decrease. If you write
552 compr_new_inode to "0".
553
554 What: /sys/fs/f2fs/<disk>/atgc_candi
555 Date: May 2021
556 Contact: "Chao Yu" <yuchao0@huawei.com>
557 Description: When ATGC is on, it controls c
558 number of potential victim in
559 range of [0, 100], by default
560
561 What: /sys/fs/f2fs/<disk>/atgc_candi
562 Date: May 2021
563 Contact: "Chao Yu" <yuchao0@huawei.com>
564 Description: When ATGC is on, it controls c
565 number of potential victim in
566 initialized as 10 (sections).
567
568 What: /sys/fs/f2fs/<disk>/atgc_age_w
569 Date: May 2021
570 Contact: "Chao Yu" <yuchao0@huawei.com>
571 Description: When ATGC is on, it controls a
572 in between aging and valid blo
573 [0, 100], by default it was in
574
575 What: /sys/fs/f2fs/<disk>/atgc_age_t
576 Date: May 2021
577 Contact: "Chao Yu" <yuchao0@huawei.com>
578 Description: When ATGC is on, it controls a
579 candidates whose age is not be
580 initialized as 604800 seconds
581
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
589 Date: July 2021
590 Contact: "Daeho Jeong" <daehojeong@googl
591 Description: Show how many segments have be
592 GC mode (0: GC normal, 1: GC i
593 3: GC idle AT, 4: GC urgent hi
594 You can re-initialize this val
595
596 What: /sys/fs/f2fs/<disk>/gc_segment
597 Date: July 2021
598 Contact: "Daeho Jeong" <daehojeong@googl
599 Description: You can control for which gc m
600 Refer to the description of th
601
602 What: /sys/fs/f2fs/<disk>/seq_file_r
603 Date: July 2021
604 Contact: "Daeho Jeong" <daehojeong@googl
605 Description: You can control the multiplier
606 between 2 (default) and 256 fo
607
608 What: /sys/fs/f2fs/<disk>/max_fragme
609 Date: August 2021
610 Contact: "Daeho Jeong" <daehojeong@googl
611 Description: With "mode=fragment:block" mou
612 f2fs will allocate 1..<max_fra
613 in the length of 1..<max_fragm
614 between 1..512 and the default
615
616 What: /sys/fs/f2fs/<disk>/max_fragme
617 Date: August 2021
618 Contact: "Daeho Jeong" <daehojeong@googl
619 Description: With "mode=fragment:block" mou
620 f2fs will allocate 1..<max_fra
621 in the length of 1..<max_fragm
622 between 1..512 and the default
623
624 What: /sys/fs/f2fs/<disk>/gc_remaini
625 Date: October 2022
626 Contact: "Yangtao Li" <frank.li@vivo.com
627 Description: You can set the trial count li
628 If GC thread gets to the limit
629 By default, the value is zero,
630
631 What: /sys/fs/f2fs/<disk>/max_roll_f
632 Date: January 2022
633 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
634 Description: Controls max # of node block w
635 recovery. This can limit the r
636
637 What: /sys/fs/f2fs/<disk>/unusable_b
638 Date: June 2022
639 Contact: "Jaegeuk Kim" <jaegeuk@kernel.o
640 Description: Shows the number of unusable b
641 the zone capacity reported by
642
643 What: /sys/fs/f2fs/<disk>/current_at
644 Date: July 2022
645 Contact: "Daeho Jeong" <daehojeong@googl
646 Description: Show the total current atomic
647 This is a read-only entry.
648
649 What: /sys/fs/f2fs/<disk>/peak_atomi
650 Date: July 2022
651 Contact: "Daeho Jeong" <daehojeong@googl
652 Description: Show the peak value of total c
653 If you write "0" here, you can
654
655 What: /sys/fs/f2fs/<disk>/committed_
656 Date: July 2022
657 Contact: "Daeho Jeong" <daehojeong@googl
658 Description: Show the accumulated total com
659 If you write "0" here, you can
660
661 What: /sys/fs/f2fs/<disk>/revoked_at
662 Date: July 2022
663 Contact: "Daeho Jeong" <daehojeong@googl
664 Description: Show the accumulated total rev
665 If you write "0" here, you can
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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