fs/affs: make export work with cold dcache

This adds get_parent function so that nfs client can still work after
cache drop (Tested on NFS v4 with echo 3 > /proc/sys/vm/drop_caches)

[weiyongjun1@huawei.com: fix return value check in affs_get_parent()]
Link: http://lkml.kernel.org/r/20170123141018.2331-1-weiyj.lk@gmail.com
Link: http://lkml.kernel.org/r/20170109191208.6085-8-fabf@skynet.be
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Suggested-by: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index fb88446bafef469a4e799322eca82c499a6982ba..96dd1d09a2735676f51b94ff9390bbc114cf8367 100644 (file)
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -447,6 +447,24 @@ done:
        return retval;
 }
 
+static struct dentry *affs_get_parent(struct dentry *child)
+{
+       struct inode *parent;
+       struct buffer_head *bh;
+
+       bh = affs_bread(child->d_sb, d_inode(child)->i_ino);
+       if (!bh)
+               return ERR_PTR(-EIO);
+
+       parent = affs_iget(child->d_sb,
+                          be32_to_cpu(AFFS_TAIL(child->d_sb, bh)->parent));
+       brelse(bh);
+       if (IS_ERR(parent))
+               return ERR_CAST(parent);
+
+       return d_obtain_alias(parent);
+}
+
 static struct inode *affs_nfs_get_inode(struct super_block *sb, u64 ino,
                                        u32 generation)
 {
@@ -484,6 +502,7 @@ static struct dentry *affs_fh_to_parent(struct super_block *sb, struct fid *fid,
 const struct export_operations affs_export_ops = {
        .fh_to_dentry = affs_fh_to_dentry,
        .fh_to_parent = affs_fh_to_parent,
+       .get_parent = affs_get_parent,
 };
 
 const struct dentry_operations affs_dentry_operations = {