affs: add ->sync_fs

Add a ->sync_fs method for data integrity syncs.  Factor out common code
between affs_put_super, affs_write_super and the new affs_sync_fs into
a helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 27 insertions, 13 deletions

diff --git a/fs/affs/super.c b/fs/affs/super.c
index c4814937c968..104fdcb3a7fc 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -25,6 +25,19 @@ static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
 static int affs_remount (struct super_block *sb, int *flags, char *data);
 
 static void
+affs_commit_super(struct super_block *sb, int clean)
+{
+        struct affs_sb_info *sbi = AFFS_SB(sb);
+        struct buffer_head *bh = sbi->s_root_bh;
+        struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
+
+        tail->bm_flag = cpu_to_be32(clean);
+        secs_to_datestamp(get_seconds(), &tail->disk_change);
+        affs_fix_checksum(sb, bh);
+        mark_buffer_dirty(bh);
+}
+
+static void
 affs_put_super(struct super_block *sb)
 {
         struct affs_sb_info *sbi = AFFS_SB(sb);
@@ -32,13 +45,8 @@ affs_put_super(struct super_block *sb)
 
         lock_kernel();
 
-        if (!(sb->s_flags & MS_RDONLY)) {
-                AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
-                secs_to_datestamp(get_seconds(),
-                                  &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
-                affs_fix_checksum(sb, sbi->s_root_bh);
-                mark_buffer_dirty(sbi->s_root_bh);
-        }
+        if (!(sb->s_flags & MS_RDONLY))
+                affs_commit_super(sb, 1);
 
         kfree(sbi->s_prefix);
         affs_free_bitmap(sb);
@@ -53,18 +61,13 @@ static void
 affs_write_super(struct super_block *sb)
 {
         int clean = 2;
-        struct affs_sb_info *sbi = AFFS_SB(sb);
 
         lock_super(sb);
         if (!(sb->s_flags & MS_RDONLY)) {
                 //      if (sbi->s_bitmap[i].bm_bh) {
                 //              if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
                 //                      clean = 0;
-                AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
-                secs_to_datestamp(get_seconds(),
-                                  &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
-                affs_fix_checksum(sb, sbi->s_root_bh);
-                mark_buffer_dirty(sbi->s_root_bh);
+                affs_commit_super(sb, clean);
                 sb->s_dirt = !clean;    /* redo until bitmap synced */
         } else
                 sb->s_dirt = 0;
@@ -73,6 +76,16 @@ affs_write_super(struct super_block *sb)
         pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
 }
 
+static int
+affs_sync_fs(struct super_block *sb, int wait)
+{
+        lock_super(sb);
+        affs_commit_super(sb, 2);
+        sb->s_dirt = 0;
+        unlock_super(sb);
+        return 0;
+}
+
 static struct kmem_cache * affs_inode_cachep;
 
 static struct inode *affs_alloc_inode(struct super_block *sb)
@@ -130,6 +143,7 @@ static const struct super_operations affs_sops = {
         .clear_inode    = affs_clear_inode,
         .put_super      = affs_put_super,
         .write_super    = affs_write_super,
+        .sync_fs        = affs_sync_fs,
         .statfs         = affs_statfs,
         .remount_fs     = affs_remount,
         .show_options   = generic_show_options,