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AFFS: wait for sb synchronization when needed 

AFFS does not ever wait for superblock synchronization in
->put_super(), ->write_super, and ->sync_fs().

However, it should wait for synchronization in ->put_super() because
it is about to be unmounted, in ->write_super() because this is
periodic SB synchronization performed from a separate kernel thread,
and in ->sync_fs() it should respect the 'wait' flag. This patch fixes
the situation.

Also, in ->put_super(), do not write the SB if it is not dirty.

Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Artem Bityutskiy 2010-07-05 15:15:00 +03:00 committed by Al Viro
parent 669d5f1f60
commit 7435d50611
1 changed files with 7 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/affs/super.c
View File

@ -26,7 +26,7 @@ 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)
affs_commit_super(struct super_block *sb, int wait, int clean)
{
struct affs_sb_info *sbi = AFFS_SB(sb);
struct buffer_head *bh = sbi->s_root_bh;
@ -36,6 +36,8 @@ affs_commit_super(struct super_block *sb, int clean)
secs_to_datestamp(get_seconds(), &tail->disk_change);
affs_fix_checksum(sb, bh);
mark_buffer_dirty(bh);
if (wait)
sync_dirty_buffer(bh);
}
static void
@ -46,8 +48,8 @@ affs_put_super(struct super_block *sb)
lock_kernel();
if (!(sb->s_flags & MS_RDONLY))
affs_commit_super(sb, 1);
if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
affs_commit_super(sb, 1, 1);
kfree(sbi->s_prefix);
affs_free_bitmap(sb);
@ -63,7 +65,7 @@ affs_write_super(struct super_block *sb)
{
lock_super(sb);
if (!(sb->s_flags & MS_RDONLY))
affs_commit_super(sb, 2);
affs_commit_super(sb, 1, 2);
sb->s_dirt = 0;
unlock_super(sb);
@ -74,7 +76,7 @@ static int
affs_sync_fs(struct super_block *sb, int wait)
{
lock_super(sb);
affs_commit_super(sb, 2);
affs_commit_super(sb, wait, 2);
sb->s_dirt = 0;
unlock_super(sb);
return 0;