[PATCH] f2fs: avoid unnecessary reads in f2fs_update_meta_block()

[Seongjae Jeong <jsjlee1020@gmail.com>]

When the packed SSA feature is enabled, f2fs_update_meta_block()
uses f2fs_get_meta_cache_retry(), which reads the target block from
disk if the cache entry is not uptodate.

However, f2fs_update_meta_block() overwrites the entire filesystem
block with memcpy(), so the existing contents are not needed.
Partial updates to packed SSA blocks are handled separately in
write_sum_block().

Use f2fs_grab_meta_cache() unconditionally to avoid reading blocks
that will be fully overwritten. Also remove the error check, since
f2fs_grab_meta_cache() retries allocation failures internally and
does not return an error pointer.

Signed-off-by: Seongjae Jeong <jsjlee1020@gmail.com>
---
 fs/f2fs/segment.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 794e0d99fc7c..51858f64e43e 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2844,13 +2844,7 @@ void f2fs_update_meta_block(struct f2fs_sb_info *sbi,
 {
 	struct f2fs_cached_block *entry;
 
-	if (!f2fs_sb_has_packed_ssa(sbi))
-		entry = f2fs_grab_meta_cache(sbi, blk_addr);
-	else
-		entry = f2fs_get_meta_cache_retry(sbi, blk_addr);
-
-	if (IS_ERR(entry))
-		return;
+	entry = f2fs_grab_meta_cache(sbi, blk_addr);
 
 	memcpy(cache_address(entry), src, F2FS_BLKSIZE(sbi));
 	f2fs_mark_cache_dirty(entry);
-- 
2.53.0