From: Chao Yu <chao@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 7424470c68cbe..5c0920e11e4ba 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 4cc9b948139ad..5c0b2b300aa1b 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2225,7 +2225,7 @@ 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
