[PATCH 1/2] befs: add flags field to validate superblock state

From: Salah Triki
Date: Tue Aug 09 2016 - 09:46:27 EST


For validating superblock state, add flags field to befs_sb_info, read the state from the disk
and check if it is equal to BEFS_DIRTY.

Signed-off-by: Salah Triki <salah.triki@xxxxxxxxx>
---
fs/befs/befs.h | 3 +++
fs/befs/super.c | 4 +++-
2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/befs/befs.h b/fs/befs/befs.h
index e0f59263a..511d16d 100644
--- a/fs/befs/befs.h
+++ b/fs/befs/befs.h
@@ -43,6 +43,9 @@ struct befs_sb_info {
u32 ag_shift;
u32 num_ags;

+ /* State of the superblock */
+ u32 flags;
+
/* jornal log entry */
befs_block_run log_blocks;
befs_off_t log_start;
diff --git a/fs/befs/super.c b/fs/befs/super.c
index aeafc4d..79be409 100644
--- a/fs/befs/super.c
+++ b/fs/befs/super.c
@@ -45,6 +45,8 @@ befs_load_sb(struct super_block *sb, befs_super_block * disk_sb)
befs_sb->ag_shift = fs32_to_cpu(sb, disk_sb->ag_shift);
befs_sb->num_ags = fs32_to_cpu(sb, disk_sb->num_ags);

+ befs_sb->flags = fs32_to_cpu(sb, disk_sb->flags);
+
befs_sb->log_blocks = fsrun_to_cpu(sb, disk_sb->log_blocks);
befs_sb->log_start = fs64_to_cpu(sb, disk_sb->log_start);
befs_sb->log_end = fs64_to_cpu(sb, disk_sb->log_end);
@@ -101,7 +103,7 @@ befs_check_sb(struct super_block *sb)
return BEFS_ERR;
}

- if (befs_sb->log_start != befs_sb->log_end) {
+ if (befs_sb->log_start != befs_sb->log_end || befs_sb->flags == BEFS_DIRTY) {
befs_error(sb, "Filesystem not clean! There are blocks in the "
"journal. You must boot into BeOS and mount this volume "
"to make it clean.");
--
1.9.1