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authorAl Viro <viro@zeniv.linux.org.uk>2013-10-03 13:16:50 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-10-24 23:43:28 -0400
commitcac45b062c67f86dc1d91d675128838773523243 (patch)
treefcc7dc448d0e14f992794657eae1f052e0826f5a /fs/fat/inode.c
parent2e32cf5ef2683a196df24ccd2cd2b4ed735ad9d3 (diff)
downloadlwn-cac45b062c67f86dc1d91d675128838773523243.tar.gz
lwn-cac45b062c67f86dc1d91d675128838773523243.zip
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: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/fat/inode.c')
-rw-r--r--fs/fat/inode.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 0062da21dd8b..854b578f6695 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -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;