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Commit b3b42c0d authored by Fabian Frederick's avatar Fabian Frederick Committed by Linus Torvalds
Browse files

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: default avatarFabian Frederick <fabf@skynet.be>
Signed-off-by: default avatarWei Yongjun <weiyongjun1@huawei.com>
Suggested-by: default avatarAlexander Viro <viro@zeniv.linux.org.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f567accb

fs/affs/namei.c

+19 −0
Original line number Diff line number Diff line
@@ -447,6 +447,24 @@ affs_rename(struct inode *old_dir, struct dentry *old_dentry, 
	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 = {