linux-kernel - [PATCH 3/3] f2fs: fix to check return value of f2fs_reserve_new

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Message-Id: <20231116062556.2451839-3-chao@kernel.org>
Date:   Thu, 16 Nov 2023 14:25:56 +0800
From:   Chao Yu <chao@...nel.org>
To:     jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Chao Yu <chao@...nel.org>
Subject: [PATCH 3/3] f2fs: fix to check return value of f2fs_reserve_new_block()

Let's check return value of f2fs_reserve_new_block() in do_recover_data()
rather than letting it fails silently.

Also refactoring check condition on return value of f2fs_reserve_new_block()
as below:
- trigger f2fs_bug_on() only for ENOSPC case;
- use do-while statement to avoid redundant codes;

Signed-off-by: Chao Yu <chao@...nel.org>
---
 fs/f2fs/recovery.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index b56d0f1078a7..16415c770b45 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -712,7 +712,16 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 		 */
 		if (dest == NEW_ADDR) {
 			f2fs_truncate_data_blocks_range(&dn, 1);
-			f2fs_reserve_new_block(&dn);
+			do {
+				err = f2fs_reserve_new_block(&dn);
+				if (err == -ENOSPC) {
+					f2fs_bug_on(sbi, 1);
+					break;
+				}
+			} while (err &&
+				IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION));
+			if (err)
+				goto err;
 			continue;
 		}
 
@@ -720,12 +729,14 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 		if (f2fs_is_valid_blkaddr(sbi, dest, META_POR)) {
 
 			if (src == NULL_ADDR) {
-				err = f2fs_reserve_new_block(&dn);
-				while (err &&
-				       IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION))
+				do {
 					err = f2fs_reserve_new_block(&dn);
-				/* We should not get -ENOSPC */
-				f2fs_bug_on(sbi, err);
+					if (err == -ENOSPC) {
+						f2fs_bug_on(sbi, 1);
+						break;
+					}
+				} while (err &&
+					IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION));
 				if (err)
 					goto err;
 			}
-- 
2.40.1