[f2fs-dev] [PATCH 1/2] fsck.f2fs: fix meta readahead after non-contiguous blocks

[f2fs-dev] [PATCH 1/2] fsck.f2fs: fix meta readahead after non-contiguous blocks

[Yangyang Zang]

When the current block is not contiguous with the in-progress readahead
range, f2fs_ra_meta_pages() issues the pending range but keeps the old
start block and length.

As a result, the current block is not included in any readahead range,
and subsequent non-contiguous blocks keep reissuing the stale range
instead of starting a new one.

Reset start_blk and len after issuing the pending range so readahead can
continue from the current block.

Signed-off-by: Yangyang Zang <zangyangyang1@xiaomi.com>
---
 fsck/mount.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fsck/mount.c b/fsck/mount.c
index 2f4e6c92bf6c..ea171a4c97c5 100644
--- a/fsck/mount.c
+++ b/fsck/mount.c
@@ -901,6 +901,8 @@ int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 		} else {
 			dev_readahead(start_blk << F2FS_BLKSIZE_BITS,
 						len << F2FS_BLKSIZE_BITS);
+			start_blk = blkaddr;
+			len = 1;
 		}
 	}
 out:
-- 
2.43.0



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[f2fs-dev] [PATCH 2/2] fsck.f2fs: read each sit block only once in build_sit_entries

[Yangyang Zang]

build_sit_entries() calls get_current_sit_page() for every entry while
scanning consecutive sit entries. Since each sit block contains multiple
consecutive sit entries, this causes the same sit block to be read and
copied repeatedly.

Read the sit block only when entering a new sit block, and reuse the
cached block for the remaining sit entries in that block.

Signed-off-by: Yangyang Zang <zangyangyang1@xiaomi.com>
---
 fsck/mount.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fsck/mount.c b/fsck/mount.c
index ea171a4c97c5..4c63c2d185ba 100644
--- a/fsck/mount.c
+++ b/fsck/mount.c
@@ -2676,7 +2676,8 @@ static int build_sit_entries(struct f2fs_sb_info *sbi)
 		for (; segno < end && segno < MAIN_SEGS(sbi); segno++) {
 			se = &sit_i->sentries[segno];
 
-			get_current_sit_page(sbi, segno, sit_blk);
+			if (SIT_ENTRY_OFFSET(sit_i, segno) == 0)
+				get_current_sit_page(sbi, segno, sit_blk);
 			sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, segno)];
 
 			check_block_count(sbi, segno, &sit);
-- 
2.43.0



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Re: [f2fs-dev] [PATCH 2/2] fsck.f2fs: read each sit block only once in build_sit_entries

[Chao Yu via Linux-f2fs-devel]

On 7/1/26 17:28, Yangyang Zang wrote:
> build_sit_entries() calls get_current_sit_page() for every entry while
> scanning consecutive sit entries. Since each sit block contains multiple
> consecutive sit entries, this causes the same sit block to be read and
> copied repeatedly.
> 
> Read the sit block only when entering a new sit block, and reuse the
> cached block for the remaining sit entries in that block.
> 
> Signed-off-by: Yangyang Zang <zangyangyang1@xiaomi.com>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,


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Re: [f2fs-dev] [PATCH 1/2] fsck.f2fs: fix meta readahead after non-contiguous blocks

[Chao Yu via Linux-f2fs-devel]

On 7/1/26 17:28, Yangyang Zang wrote:
> When the current block is not contiguous with the in-progress readahead
> range, f2fs_ra_meta_pages() issues the pending range but keeps the old
> start block and length.
> 
> As a result, the current block is not included in any readahead range,
> and subsequent non-contiguous blocks keep reissuing the stale range
> instead of starting a new one.
> 
> Reset start_blk and len after issuing the pending range so readahead can
> continue from the current block.
> 
> Signed-off-by: Yangyang Zang <zangyangyang1@xiaomi.com>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,


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