Commit 30687e0a authored by Al Viro's avatar Al Viro
Browse files

hpfs: make freeing sbi and codetables rcu-delayed 



makes ->d_hash() and ->d_compare() safety in RCU mode independent
from vfsmount_lock

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent e2fec7c3

fs/hpfs/hpfs_fn.h

+1 −0
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ struct hpfs_sb_info { 
	unsigned sb_c_bitmap;		/* current bitmap */

	unsigned sb_max_fwd_alloc;	/* max forwad allocation */

	int sb_timeshift;

	struct rcu_head rcu;

};



/* Four 512-byte buffers and the 2k block obtained by concatenating them */

fs/hpfs/super.c

+14 −14
Original line number Diff line number Diff line
@@ -101,18 +101,24 @@ int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, 
	return 0;

}



static void hpfs_put_super(struct super_block *s)

static void free_sbi(struct hpfs_sb_info *sbi)

{

	struct hpfs_sb_info *sbi = hpfs_sb(s);

	kfree(sbi->sb_cp_table);

	kfree(sbi->sb_bmp_dir);

	kfree(sbi);

}



static void lazy_free_sbi(struct rcu_head *rcu)

{

	free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));

}



static void hpfs_put_super(struct super_block *s)

{

	hpfs_lock(s);

	unmark_dirty(s);

	hpfs_unlock(s);



	kfree(sbi->sb_cp_table);

	kfree(sbi->sb_bmp_dir);

	s->s_fs_info = NULL;

	kfree(sbi);

	call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);

}



unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
@@ -485,9 +491,6 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent) 
	}

	s->s_fs_info = sbi;



	sbi->sb_bmp_dir = NULL;

	sbi->sb_cp_table = NULL;



	mutex_init(&sbi->hpfs_mutex);

	hpfs_lock(s);
@@ -679,10 +682,7 @@ bail2: brelse(bh0); 
bail1:

bail0:

	hpfs_unlock(s);

	kfree(sbi->sb_bmp_dir);

	kfree(sbi->sb_cp_table);

	s->s_fs_info = NULL;

	kfree(sbi);

	free_sbi(sbi);

	return -EINVAL;

}