linux-kernel - [PATCH 1/5] f2fs: check number of blocks in a current section

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Date: Fri, 23 Feb 2024 12:55:31 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc: Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 1/5] f2fs: check number of blocks in a current section

In cfd66bb715fd ("f2fs: fix deadloop in foreground GC"), we needed to check
the number of blocks in a section instead of the segment.

In addtion, let's check the entire node sections when checking the avaiable
node block space. It does not match one to one per temperature, but currently
we don't have exact dirty page count per temperature. Hence, use a rough
estimation.

Fixes: cfd66bb715fd ("f2fs: fix deadloop in foreground GC")
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/segment.h | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 3edd3809b6b5..15bf5edd9b3c 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -561,23 +561,23 @@ static inline bool has_curseg_enough_space(struct f2fs_sb_info *sbi,
 			unsigned int node_blocks, unsigned int dent_blocks)
 {
 
-	unsigned int segno, left_blocks;
+	unsigned segno, left_blocks;
 	int i;
 
-	/* check current node segment */
+	/* check current node sections, which counts very roughly */
+	left_blocks = 0;
 	for (i = CURSEG_HOT_NODE; i <= CURSEG_COLD_NODE; i++) {
 		segno = CURSEG_I(sbi, i)->segno;
-		left_blocks = f2fs_usable_blks_in_seg(sbi, segno) -
-				get_seg_entry(sbi, segno)->ckpt_valid_blocks;
-
-		if (node_blocks > left_blocks)
-			return false;
+		left_blocks += CAP_BLKS_PER_SEC(sbi) -
+				get_ckpt_valid_blocks(sbi, segno, true);
 	}
+	if (node_blocks > left_blocks)
+		return false;
 
-	/* check current data segment */
+	/* check current data section for dentry blocks. */
 	segno = CURSEG_I(sbi, CURSEG_HOT_DATA)->segno;
-	left_blocks = f2fs_usable_blks_in_seg(sbi, segno) -
-			get_seg_entry(sbi, segno)->ckpt_valid_blocks;
+	left_blocks = CAP_BLKS_PER_SEC(sbi) -
+			get_ckpt_valid_blocks(sbi, segno, true);
 	if (dent_blocks > left_blocks)
 		return false;
 	return true;
@@ -626,7 +626,7 @@ static inline bool has_not_enough_free_secs(struct f2fs_sb_info *sbi,
 
 	if (free_secs > upper_secs)
 		return false;
-	else if (free_secs <= lower_secs)
+	if (free_secs <= lower_secs)
 		return true;
 	return !curseg_space;
 }
-- 
2.44.0.rc0.258.g7320e95886-goog