[PATCH 1/2] Revert: "f2fs: check in-memory block bitmap"

[PATCH 1/2] Revert: "f2fs: check in-memory block bitmap"

[Chao Yu]

Commit 355e78913c0d ("f2fs: check in-memory block bitmap") added
a mirror for valid block bitmap, it expects to detect in-memory
corruption, however we never got any reports from the check points
for almost decade, let's remove the code, it can help to save
memories.

Cc: wallentx <william.allentx@gmail.com>
Suggested-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/segment.c | 38 --------------------------------------
 fs/f2fs/segment.h |  6 ------
 2 files changed, 44 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1ef4edb77078..9926ba9d77ba 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2455,9 +2455,6 @@ static int update_sit_entry_for_release(struct f2fs_sb_info *sbi, struct seg_ent
 				unsigned int segno, block_t blkaddr, unsigned int offset, int del)
 {
 	bool exist;
-#ifdef CONFIG_F2FS_CHECK_FS
-	bool mir_exist;
-#endif
 	int i;
 	int del_count = -del;
 
@@ -2465,15 +2462,6 @@ static int update_sit_entry_for_release(struct f2fs_sb_info *sbi, struct seg_ent
 
 	for (i = 0; i < del_count; i++) {
 		exist = f2fs_test_and_clear_bit(offset + i, se->cur_valid_map);
-#ifdef CONFIG_F2FS_CHECK_FS
-		mir_exist = f2fs_test_and_clear_bit(offset + i,
-						se->cur_valid_map_mir);
-		if (unlikely(exist != mir_exist)) {
-			f2fs_err(sbi, "Inconsistent error when clearing bitmap, blk:%u, old bit:%d",
-				blkaddr + i, exist);
-			f2fs_bug_on(sbi, 1);
-		}
-#endif
 		if (unlikely(!exist)) {
 			f2fs_err(sbi, "Bitmap was wrongly cleared, blk:%u", blkaddr + i);
 			f2fs_bug_on(sbi, 1);
@@ -2514,20 +2502,8 @@ static int update_sit_entry_for_alloc(struct f2fs_sb_info *sbi, struct seg_entry
 				unsigned int segno, block_t blkaddr, unsigned int offset, int del)
 {
 	bool exist;
-#ifdef CONFIG_F2FS_CHECK_FS
-	bool mir_exist;
-#endif
 
 	exist = f2fs_test_and_set_bit(offset, se->cur_valid_map);
-#ifdef CONFIG_F2FS_CHECK_FS
-	mir_exist = f2fs_test_and_set_bit(offset,
-					se->cur_valid_map_mir);
-	if (unlikely(exist != mir_exist)) {
-		f2fs_err(sbi, "Inconsistent error when setting bitmap, blk:%u, old bit:%d",
-			blkaddr, exist);
-		f2fs_bug_on(sbi, 1);
-	}
-#endif
 	if (unlikely(exist)) {
 		f2fs_err(sbi, "Bitmap was wrongly set, blk:%u", blkaddr);
 		f2fs_bug_on(sbi, 1);
@@ -4771,11 +4747,6 @@ void f2fs_flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 			int offset, sit_offset;
 
 			se = get_seg_entry(sbi, segno);
-#ifdef CONFIG_F2FS_CHECK_FS
-			if (memcmp(se->cur_valid_map, se->cur_valid_map_mir,
-						SIT_VBLOCK_MAP_SIZE))
-				f2fs_bug_on(sbi, 1);
-#endif
 
 			/* add discard candidates */
 			if (!(cpc->reason & CP_DISCARD)) {
@@ -4866,11 +4837,7 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
 	if (!sit_i->dirty_sentries_bitmap)
 		return -ENOMEM;
 
-#ifdef CONFIG_F2FS_CHECK_FS
-	bitmap_size = MAIN_SEGS(sbi) * SIT_VBLOCK_MAP_SIZE * (3 + discard_map);
-#else
 	bitmap_size = MAIN_SEGS(sbi) * SIT_VBLOCK_MAP_SIZE * (2 + discard_map);
-#endif
 	sit_i->bitmap = f2fs_kvzalloc(sbi, bitmap_size, GFP_KERNEL);
 	if (!sit_i->bitmap)
 		return -ENOMEM;
@@ -4884,11 +4851,6 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
 		sit_i->sentries[start].ckpt_valid_map = bitmap;
 		bitmap += SIT_VBLOCK_MAP_SIZE;
 
-#ifdef CONFIG_F2FS_CHECK_FS
-		sit_i->sentries[start].cur_valid_map_mir = bitmap;
-		bitmap += SIT_VBLOCK_MAP_SIZE;
-#endif
-
 		if (discard_map) {
 			sit_i->sentries[start].discard_map = bitmap;
 			bitmap += SIT_VBLOCK_MAP_SIZE;
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 08735a165433..38a56b8ab2cc 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -177,9 +177,6 @@ struct seg_entry {
 	unsigned int ckpt_valid_blocks:10;	/* # of valid blocks last cp */
 	unsigned int padding:6;		/* padding */
 	unsigned char *cur_valid_map;	/* validity bitmap of blocks */
-#ifdef CONFIG_F2FS_CHECK_FS
-	unsigned char *cur_valid_map_mir;	/* mirror of current valid bitmap */
-#endif
 	/*
 	 * # of valid blocks and the validity bitmap stored in the last
 	 * checkpoint pack. This information is used by the SSR mode.
@@ -408,9 +405,6 @@ static inline void seg_info_from_raw_sit(struct seg_entry *se,
 	se->ckpt_valid_blocks = GET_SIT_VBLOCKS(rs);
 	memcpy(se->cur_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
 	memcpy(se->ckpt_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
-#ifdef CONFIG_F2FS_CHECK_FS
-	memcpy(se->cur_valid_map_mir, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
-#endif
 	se->type = GET_SIT_TYPE(rs);
 	se->mtime = le64_to_cpu(rs->mtime);
 }
-- 
2.49.0

[f2fs-dev] [PATCH 1/2] Revert: "f2fs: check in-memory block bitmap"

[Chao Yu via Linux-f2fs-devel]

Commit 355e78913c0d ("f2fs: check in-memory block bitmap") added
a mirror for valid block bitmap, it expects to detect in-memory
corruption, however we never got any reports from the check points
for almost decade, let's remove the code, it can help to save
memories.

Cc: wallentx <william.allentx@gmail.com>
Suggested-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/segment.c | 38 --------------------------------------
 fs/f2fs/segment.h |  6 ------
 2 files changed, 44 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1ef4edb77078..9926ba9d77ba 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2455,9 +2455,6 @@ static int update_sit_entry_for_release(struct f2fs_sb_info *sbi, struct seg_ent
 				unsigned int segno, block_t blkaddr, unsigned int offset, int del)
 {
 	bool exist;
-#ifdef CONFIG_F2FS_CHECK_FS
-	bool mir_exist;
-#endif
 	int i;
 	int del_count = -del;
 
@@ -2465,15 +2462,6 @@ static int update_sit_entry_for_release(struct f2fs_sb_info *sbi, struct seg_ent
 
 	for (i = 0; i < del_count; i++) {
 		exist = f2fs_test_and_clear_bit(offset + i, se->cur_valid_map);
-#ifdef CONFIG_F2FS_CHECK_FS
-		mir_exist = f2fs_test_and_clear_bit(offset + i,
-						se->cur_valid_map_mir);
-		if (unlikely(exist != mir_exist)) {
-			f2fs_err(sbi, "Inconsistent error when clearing bitmap, blk:%u, old bit:%d",
-				blkaddr + i, exist);
-			f2fs_bug_on(sbi, 1);
-		}
-#endif
 		if (unlikely(!exist)) {
 			f2fs_err(sbi, "Bitmap was wrongly cleared, blk:%u", blkaddr + i);
 			f2fs_bug_on(sbi, 1);
@@ -2514,20 +2502,8 @@ static int update_sit_entry_for_alloc(struct f2fs_sb_info *sbi, struct seg_entry
 				unsigned int segno, block_t blkaddr, unsigned int offset, int del)
 {
 	bool exist;
-#ifdef CONFIG_F2FS_CHECK_FS
-	bool mir_exist;
-#endif
 
 	exist = f2fs_test_and_set_bit(offset, se->cur_valid_map);
-#ifdef CONFIG_F2FS_CHECK_FS
-	mir_exist = f2fs_test_and_set_bit(offset,
-					se->cur_valid_map_mir);
-	if (unlikely(exist != mir_exist)) {
-		f2fs_err(sbi, "Inconsistent error when setting bitmap, blk:%u, old bit:%d",
-			blkaddr, exist);
-		f2fs_bug_on(sbi, 1);
-	}
-#endif
 	if (unlikely(exist)) {
 		f2fs_err(sbi, "Bitmap was wrongly set, blk:%u", blkaddr);
 		f2fs_bug_on(sbi, 1);
@@ -4771,11 +4747,6 @@ void f2fs_flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 			int offset, sit_offset;
 
 			se = get_seg_entry(sbi, segno);
-#ifdef CONFIG_F2FS_CHECK_FS
-			if (memcmp(se->cur_valid_map, se->cur_valid_map_mir,
-						SIT_VBLOCK_MAP_SIZE))
-				f2fs_bug_on(sbi, 1);
-#endif
 
 			/* add discard candidates */
 			if (!(cpc->reason & CP_DISCARD)) {
@@ -4866,11 +4837,7 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
 	if (!sit_i->dirty_sentries_bitmap)
 		return -ENOMEM;
 
-#ifdef CONFIG_F2FS_CHECK_FS
-	bitmap_size = MAIN_SEGS(sbi) * SIT_VBLOCK_MAP_SIZE * (3 + discard_map);
-#else
 	bitmap_size = MAIN_SEGS(sbi) * SIT_VBLOCK_MAP_SIZE * (2 + discard_map);
-#endif
 	sit_i->bitmap = f2fs_kvzalloc(sbi, bitmap_size, GFP_KERNEL);
 	if (!sit_i->bitmap)
 		return -ENOMEM;
@@ -4884,11 +4851,6 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
 		sit_i->sentries[start].ckpt_valid_map = bitmap;
 		bitmap += SIT_VBLOCK_MAP_SIZE;
 
-#ifdef CONFIG_F2FS_CHECK_FS
-		sit_i->sentries[start].cur_valid_map_mir = bitmap;
-		bitmap += SIT_VBLOCK_MAP_SIZE;
-#endif
-
 		if (discard_map) {
 			sit_i->sentries[start].discard_map = bitmap;
 			bitmap += SIT_VBLOCK_MAP_SIZE;
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 08735a165433..38a56b8ab2cc 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -177,9 +177,6 @@ struct seg_entry {
 	unsigned int ckpt_valid_blocks:10;	/* # of valid blocks last cp */
 	unsigned int padding:6;		/* padding */
 	unsigned char *cur_valid_map;	/* validity bitmap of blocks */
-#ifdef CONFIG_F2FS_CHECK_FS
-	unsigned char *cur_valid_map_mir;	/* mirror of current valid bitmap */
-#endif
 	/*
 	 * # of valid blocks and the validity bitmap stored in the last
 	 * checkpoint pack. This information is used by the SSR mode.
@@ -408,9 +405,6 @@ static inline void seg_info_from_raw_sit(struct seg_entry *se,
 	se->ckpt_valid_blocks = GET_SIT_VBLOCKS(rs);
 	memcpy(se->cur_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
 	memcpy(se->ckpt_valid_map, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
-#ifdef CONFIG_F2FS_CHECK_FS
-	memcpy(se->cur_valid_map_mir, rs->valid_map, SIT_VBLOCK_MAP_SIZE);
-#endif
 	se->type = GET_SIT_TYPE(rs);
 	se->mtime = le64_to_cpu(rs->mtime);
 }
-- 
2.49.0



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[PATCH 2/2] Revert: "f2fs: check in-memory sit version bitmap"

[Chao Yu]

Commit ae27d62e6bef ("f2fs: check in-memory sit version bitmap") added
a mirror for sit version bitmap, it expects to detect in-memory
corruption, however we never got any reports from the check points
for almost decade, let's remove the code, it can help to save
memories.

Cc: wallentx <william.allentx@gmail.com>
Suggested-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/segment.c |  6 ------
 fs/f2fs/segment.h | 16 ----------------
 2 files changed, 22 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9926ba9d77ba..993555042876 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -4882,11 +4882,6 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
 		return -ENOMEM;
 
 #ifdef CONFIG_F2FS_CHECK_FS
-	sit_i->sit_bitmap_mir = kmemdup(src_bitmap,
-					sit_bitmap_size, GFP_KERNEL);
-	if (!sit_i->sit_bitmap_mir)
-		return -ENOMEM;
-
 	sit_i->invalid_segmap = f2fs_kvzalloc(sbi,
 					main_bitmap_size, GFP_KERNEL);
 	if (!sit_i->invalid_segmap)
@@ -5849,7 +5844,6 @@ static void destroy_sit_info(struct f2fs_sb_info *sbi)
 	SM_I(sbi)->sit_info = NULL;
 	kfree(sit_i->sit_bitmap);
 #ifdef CONFIG_F2FS_CHECK_FS
-	kfree(sit_i->sit_bitmap_mir);
 	kvfree(sit_i->invalid_segmap);
 #endif
 	kfree(sit_i);
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 38a56b8ab2cc..b0c06b3580b4 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -206,8 +206,6 @@ struct sit_info {
 	char *bitmap;			/* all bitmaps pointer */
 	char *sit_bitmap;		/* SIT bitmap pointer */
 #ifdef CONFIG_F2FS_CHECK_FS
-	char *sit_bitmap_mir;		/* SIT bitmap mirror */
-
 	/* bitmap of segments to be ignored by GC in case of errors */
 	unsigned long *invalid_segmap;
 #endif
@@ -549,11 +547,6 @@ static inline void get_sit_bitmap(struct f2fs_sb_info *sbi,
 {
 	struct sit_info *sit_i = SIT_I(sbi);
 
-#ifdef CONFIG_F2FS_CHECK_FS
-	if (memcmp(sit_i->sit_bitmap, sit_i->sit_bitmap_mir,
-						sit_i->bitmap_size))
-		f2fs_bug_on(sbi, 1);
-#endif
 	memcpy(dst_addr, sit_i->sit_bitmap, sit_i->bitmap_size);
 }
 
@@ -894,12 +887,6 @@ static inline pgoff_t current_sit_addr(struct f2fs_sb_info *sbi,
 
 	f2fs_bug_on(sbi, !valid_main_segno(sbi, start));
 
-#ifdef CONFIG_F2FS_CHECK_FS
-	if (f2fs_test_bit(offset, sit_i->sit_bitmap) !=
-			f2fs_test_bit(offset, sit_i->sit_bitmap_mir))
-		f2fs_bug_on(sbi, 1);
-#endif
-
 	/* calculate sit block address */
 	if (f2fs_test_bit(offset, sit_i->sit_bitmap))
 		blk_addr += sit_i->sit_blocks;
@@ -925,9 +912,6 @@ static inline void set_to_next_sit(struct sit_info *sit_i, unsigned int start)
 	unsigned int block_off = SIT_BLOCK_OFFSET(start);
 
 	f2fs_change_bit(block_off, sit_i->sit_bitmap);
-#ifdef CONFIG_F2FS_CHECK_FS
-	f2fs_change_bit(block_off, sit_i->sit_bitmap_mir);
-#endif
 }
 
 static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi,
-- 
2.49.0

[f2fs-dev] [PATCH 2/2] Revert: "f2fs: check in-memory sit version bitmap"

[Chao Yu via Linux-f2fs-devel]

Commit ae27d62e6bef ("f2fs: check in-memory sit version bitmap") added
a mirror for sit version bitmap, it expects to detect in-memory
corruption, however we never got any reports from the check points
for almost decade, let's remove the code, it can help to save
memories.

Cc: wallentx <william.allentx@gmail.com>
Suggested-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/segment.c |  6 ------
 fs/f2fs/segment.h | 16 ----------------
 2 files changed, 22 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9926ba9d77ba..993555042876 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -4882,11 +4882,6 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
 		return -ENOMEM;
 
 #ifdef CONFIG_F2FS_CHECK_FS
-	sit_i->sit_bitmap_mir = kmemdup(src_bitmap,
-					sit_bitmap_size, GFP_KERNEL);
-	if (!sit_i->sit_bitmap_mir)
-		return -ENOMEM;
-
 	sit_i->invalid_segmap = f2fs_kvzalloc(sbi,
 					main_bitmap_size, GFP_KERNEL);
 	if (!sit_i->invalid_segmap)
@@ -5849,7 +5844,6 @@ static void destroy_sit_info(struct f2fs_sb_info *sbi)
 	SM_I(sbi)->sit_info = NULL;
 	kfree(sit_i->sit_bitmap);
 #ifdef CONFIG_F2FS_CHECK_FS
-	kfree(sit_i->sit_bitmap_mir);
 	kvfree(sit_i->invalid_segmap);
 #endif
 	kfree(sit_i);
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 38a56b8ab2cc..b0c06b3580b4 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -206,8 +206,6 @@ struct sit_info {
 	char *bitmap;			/* all bitmaps pointer */
 	char *sit_bitmap;		/* SIT bitmap pointer */
 #ifdef CONFIG_F2FS_CHECK_FS
-	char *sit_bitmap_mir;		/* SIT bitmap mirror */
-
 	/* bitmap of segments to be ignored by GC in case of errors */
 	unsigned long *invalid_segmap;
 #endif
@@ -549,11 +547,6 @@ static inline void get_sit_bitmap(struct f2fs_sb_info *sbi,
 {
 	struct sit_info *sit_i = SIT_I(sbi);
 
-#ifdef CONFIG_F2FS_CHECK_FS
-	if (memcmp(sit_i->sit_bitmap, sit_i->sit_bitmap_mir,
-						sit_i->bitmap_size))
-		f2fs_bug_on(sbi, 1);
-#endif
 	memcpy(dst_addr, sit_i->sit_bitmap, sit_i->bitmap_size);
 }
 
@@ -894,12 +887,6 @@ static inline pgoff_t current_sit_addr(struct f2fs_sb_info *sbi,
 
 	f2fs_bug_on(sbi, !valid_main_segno(sbi, start));
 
-#ifdef CONFIG_F2FS_CHECK_FS
-	if (f2fs_test_bit(offset, sit_i->sit_bitmap) !=
-			f2fs_test_bit(offset, sit_i->sit_bitmap_mir))
-		f2fs_bug_on(sbi, 1);
-#endif
-
 	/* calculate sit block address */
 	if (f2fs_test_bit(offset, sit_i->sit_bitmap))
 		blk_addr += sit_i->sit_blocks;
@@ -925,9 +912,6 @@ static inline void set_to_next_sit(struct sit_info *sit_i, unsigned int start)
 	unsigned int block_off = SIT_BLOCK_OFFSET(start);
 
 	f2fs_change_bit(block_off, sit_i->sit_bitmap);
-#ifdef CONFIG_F2FS_CHECK_FS
-	f2fs_change_bit(block_off, sit_i->sit_bitmap_mir);
-#endif
 }
 
 static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi,
-- 
2.49.0



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Re: [f2fs-dev] [PATCH 1/2] Revert: "f2fs: check in-memory block bitmap"

[patchwork-bot+f2fs]

Hello:

This series was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Fri, 22 May 2026 14:59:11 +0800 you wrote:
> Commit 355e78913c0d ("f2fs: check in-memory block bitmap") added
> a mirror for valid block bitmap, it expects to detect in-memory
> corruption, however we never got any reports from the check points
> for almost decade, let's remove the code, it can help to save
> memories.
> 
> Cc: wallentx <william.allentx@gmail.com>
> Suggested-by: Jaegeuk Kim <jaegeuk@kernel.org>
> Signed-off-by: Chao Yu <chao@kernel.org>
> 
> [...]

Here is the summary with links:
  - [f2fs-dev,1/2] Revert: "f2fs: check in-memory block bitmap"
    https://git.kernel.org/jaegeuk/f2fs/c/b7e85aafc96b
  - [f2fs-dev,2/2] Revert: "f2fs: check in-memory sit version bitmap"
    https://git.kernel.org/jaegeuk/f2fs/c/902d57fc5b84

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [f2fs-dev] [PATCH 1/2] Revert: "f2fs: check in-memory block bitmap"

[patchwork-bot+f2fs--- via Linux-f2fs-devel]

Hello:

This series was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Fri, 22 May 2026 14:59:11 +0800 you wrote:
> Commit 355e78913c0d ("f2fs: check in-memory block bitmap") added
> a mirror for valid block bitmap, it expects to detect in-memory
> corruption, however we never got any reports from the check points
> for almost decade, let's remove the code, it can help to save
> memories.
> 
> Cc: wallentx <william.allentx@gmail.com>
> Suggested-by: Jaegeuk Kim <jaegeuk@kernel.org>
> Signed-off-by: Chao Yu <chao@kernel.org>
> 
> [...]

Here is the summary with links:
  - [f2fs-dev,1/2] Revert: "f2fs: check in-memory block bitmap"
    https://git.kernel.org/jaegeuk/f2fs/c/b7e85aafc96b
  - [f2fs-dev,2/2] Revert: "f2fs: check in-memory sit version bitmap"
    https://git.kernel.org/jaegeuk/f2fs/c/902d57fc5b84

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
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