linux-kernel - [PATCH AUTOSEL 5.15 18/30] f2fs: fix to check readonly condition correctly

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Date:   Thu,  4 May 2023 15:48:11 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Chao Yu <chao@...nel.org>, Jaegeuk Kim <jaegeuk@...nel.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 5.15 18/30] f2fs: fix to check readonly condition correctly

From: Chao Yu <chao@...nel.org>

[ Upstream commit d78dfefcde9d311284434560d69c0478c55a657e ]

With below case, it can mount multi-device image w/ rw option, however
one of secondary device is set as ro, later update will cause panic, so
let's introduce f2fs_dev_is_readonly(), and check multi-devices rw status
in f2fs_remount() w/ it in order to avoid such inconsistent mount status.

mkfs.f2fs -c /dev/zram1 /dev/zram0 -f
blockdev --setro /dev/zram1
mount -t f2fs dev/zram0 /mnt/f2fs
mount: /mnt/f2fs: WARNING: source write-protected, mounted read-only.
mount -t f2fs -o remount,rw mnt/f2fs
dd if=/dev/zero  of=/mnt/f2fs/file bs=1M count=8192

kernel BUG at fs/f2fs/inline.c:258!
RIP: 0010:f2fs_write_inline_data+0x23e/0x2d0 [f2fs]
Call Trace:
  f2fs_write_single_data_page+0x26b/0x9f0 [f2fs]
  f2fs_write_cache_pages+0x389/0xa60 [f2fs]
  __f2fs_write_data_pages+0x26b/0x2d0 [f2fs]
  f2fs_write_data_pages+0x2e/0x40 [f2fs]
  do_writepages+0xd3/0x1b0
  __writeback_single_inode+0x5b/0x420
  writeback_sb_inodes+0x236/0x5a0
  __writeback_inodes_wb+0x56/0xf0
  wb_writeback+0x2a3/0x490
  wb_do_writeback+0x2b2/0x330
  wb_workfn+0x6a/0x260
  process_one_work+0x270/0x5e0
  worker_thread+0x52/0x3e0
  kthread+0xf4/0x120
  ret_from_fork+0x29/0x50

Signed-off-by: Chao Yu <chao@...nel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/f2fs/f2fs.h  | 5 +++++
 fs/f2fs/super.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 80e4f9afe86f7..1b450dcad1980 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -4284,6 +4284,11 @@ static inline bool f2fs_hw_is_readonly(struct f2fs_sb_info *sbi)
 	return false;
 }

+static inline bool f2fs_dev_is_readonly(struct f2fs_sb_info *sbi)
+{
+	return f2fs_sb_has_readonly(sbi) || f2fs_hw_is_readonly(sbi);
+}
+
 static inline bool f2fs_lfs_mode(struct f2fs_sb_info *sbi)
 {
 	return F2FS_OPTION(sbi).fs_mode == FS_MODE_LFS;
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index ae72211e422e7..4628efbfea76f 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2226,7 +2226,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 	if (f2fs_readonly(sb) && (*flags & SB_RDONLY))
 		goto skip;

-	if (f2fs_sb_has_readonly(sbi) && !(*flags & SB_RDONLY)) {
+	if (f2fs_dev_is_readonly(sbi) && !(*flags & SB_RDONLY)) {
 		err = -EROFS;
 		goto restore_opts;
 	}
-- 
2.39.2