[LogFS] Only write journal if dirty

This prevents unnecessary journal writes.  More importantly it prevents
an oops due to a journal write on failed mount.

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/logfs/segment.c b/fs/logfs/segment.c
index 664cd0dd3576..1a14f9910d55 100644
--- a/fs/logfs/segment.c
+++ b/fs/logfs/segment.c
@@ -352,7 +352,8 @@ int logfs_segment_write(struct inode *inode, struct page *page,
         int ret;
         void *buf;
 
-        BUG_ON(logfs_super(sb)->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
+        super->s_flags |= LOGFS_SB_FLAG_DIRTY;
+        BUG_ON(super->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
         do_compress = logfs_inode(inode)->li_flags & LOGFS_IF_COMPRESSED;
         if (shadow->gc_level != 0) {
                 /* temporarily disable compression for indirect blocks */
@@ -653,11 +654,13 @@ int logfs_segment_read(struct inode *inode, struct page *page,
 int logfs_segment_delete(struct inode *inode, struct logfs_shadow *shadow)
 {
         struct super_block *sb = inode->i_sb;
+        struct logfs_super *super = logfs_super(sb);
         struct logfs_object_header h;
         u16 len;
         int err;
 
-        BUG_ON(logfs_super(sb)->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
+        super->s_flags |= LOGFS_SB_FLAG_DIRTY;
+        BUG_ON(super->s_flags & LOGFS_SB_FLAG_SHUTDOWN);
         BUG_ON(shadow->old_ofs & LOGFS_FULLY_POPULATED);
         if (!shadow->old_ofs)
                 return 0;