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| author | Al Viro <viro@zeniv.linux.org.uk> | 2013-10-03 12:37:18 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-10-24 23:43:27 -0400 |
| commit | 2d1d9b5b5cc2d7d528a7cbf621d924de38b1b6b6 (patch) | |
| tree | 0e4b74b8951c842737a855ca1367009f7124b5f0 /fs/adfs | |
| parent | 30687e0a47e89f56489ab73965ee88231e611986 (diff) | |
| download | lwn-2d1d9b5b5cc2d7d528a7cbf621d924de38b1b6b6.tar.gz lwn-2d1d9b5b5cc2d7d528a7cbf621d924de38b1b6b6.zip | |
adfs: delayed freeing of sbi
makes ->d_hash() and ->d_compare() safety in RCU mode independent
from vfsmount_lock.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/adfs')
| -rw-r--r-- | fs/adfs/adfs.h | 9 | ||||
| -rw-r--r-- | fs/adfs/super.c | 3 |
2 files changed, 7 insertions, 5 deletions
diff --git a/fs/adfs/adfs.h b/fs/adfs/adfs.h index 585adafb0cc2..c770337c4b45 100644 --- a/fs/adfs/adfs.h +++ b/fs/adfs/adfs.h @@ -43,9 +43,12 @@ struct adfs_dir_ops; * ADFS file system superblock data in memory */ struct adfs_sb_info { - struct adfs_discmap *s_map; /* bh list containing map */ - struct adfs_dir_ops *s_dir; /* directory operations */ - + union { struct { + struct adfs_discmap *s_map; /* bh list containing map */ + struct adfs_dir_ops *s_dir; /* directory operations */ + }; + struct rcu_head rcu; /* used only at shutdown time */ + }; kuid_t s_uid; /* owner uid */ kgid_t s_gid; /* owner gid */ umode_t s_owner_mask; /* ADFS owner perm -> unix perm */ diff --git a/fs/adfs/super.c b/fs/adfs/super.c index 0ff4bae2c2a2..7b3003cb6f1b 100644 --- a/fs/adfs/super.c +++ b/fs/adfs/super.c @@ -123,8 +123,7 @@ static void adfs_put_super(struct super_block *sb) for (i = 0; i < asb->s_map_size; i++) brelse(asb->s_map[i].dm_bh); kfree(asb->s_map); - kfree(asb); - sb->s_fs_info = NULL; + kfree_rcu(asb, rcu); } static int adfs_show_options(struct seq_file *seq, struct dentry *root) |