Commit cac45b06 authored by Al Viro's avatar Al Viro

fat: rcu-delay unloading nls and freeing sbi

makes ->d_hash() and ->d_compare() safety in RCU mode independent
from vfsmount_lock.
Signed-off-by: 's avatarAl Viro <viro@zeniv.linux.org.uk>
parent 2e32cf5e
......@@ -102,6 +102,7 @@ struct msdos_sb_info {
struct hlist_head dir_hashtable[FAT_HASH_SIZE];
unsigned int dirty; /* fs state before mount */
struct rcu_head rcu;
};
#define FAT_CACHE_VALID 0 /* special case for valid cache */
......
......@@ -548,6 +548,16 @@ static void fat_set_state(struct super_block *sb,
brelse(bh);
}
static void delayed_free(struct rcu_head *p)
{
struct msdos_sb_info *sbi = container_of(p, struct msdos_sb_info, rcu);
unload_nls(sbi->nls_disk);
unload_nls(sbi->nls_io);
if (sbi->options.iocharset != fat_default_iocharset)
kfree(sbi->options.iocharset);
kfree(sbi);
}
static void fat_put_super(struct super_block *sb)
{
struct msdos_sb_info *sbi = MSDOS_SB(sb);
......@@ -557,14 +567,7 @@ static void fat_put_super(struct super_block *sb)
iput(sbi->fsinfo_inode);
iput(sbi->fat_inode);
unload_nls(sbi->nls_disk);
unload_nls(sbi->nls_io);
if (sbi->options.iocharset != fat_default_iocharset)
kfree(sbi->options.iocharset);
sb->s_fs_info = NULL;
kfree(sbi);
call_rcu(&sbi->rcu, delayed_free);
}
static struct kmem_cache *fat_inode_cachep;
......
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