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Commit 76fa6665 authored by Jeff Layton's avatar Jeff Layton Committed by Trond Myklebust
Browse files

rpc_pipe: set dentry operations at d_alloc time 



Currently the way these get set is a little convoluted. If the dentry is
allocated via lookup from userland, then it gets set by simple_lookup.
If it gets allocated when the kernel is populating the directory, then
it gets set via __rpc_lookup_create_exclusive, which has to check
whether they might already be set. Between both of these, this ensures
that all dentries have their d_op pointer set.

Instead of doing that, just have them set at d_alloc time by pointing
sb->s_d_op at them. With that change, we no longer want the lookup op
to set them, so we must move to using our own lookup routine.

Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent cda57a1e

net/sunrpc/rpc_pipe.c

+20 −5
Original line number Diff line number Diff line
@@ -480,6 +480,23 @@ static const struct dentry_operations rpc_dentry_operations = { 
	.d_delete = rpc_delete_dentry,

};



/*

 * Lookup the data. This is trivial - if the dentry didn't already

 * exist, we know it is negative.

 */

static struct dentry *

rpc_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)

{

	if (dentry->d_name.len > NAME_MAX)

		return ERR_PTR(-ENAMETOOLONG);

	d_add(dentry, NULL);

	return NULL;

}



const struct inode_operations rpc_dir_inode_operations = {

	.lookup		= rpc_lookup,

};



static struct inode *

rpc_get_inode(struct super_block *sb, umode_t mode)

{
@@ -492,7 +509,7 @@ rpc_get_inode(struct super_block *sb, umode_t mode) 
	switch (mode & S_IFMT) {

	case S_IFDIR:

		inode->i_fop = &simple_dir_operations;

		inode->i_op = &simple_dir_inode_operations;

		inode->i_op = &rpc_dir_inode_operations;

		inc_nlink(inode);

	default:

		break;
@@ -666,11 +683,8 @@ static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent, 
		if (!dentry)

			return ERR_PTR(-ENOMEM);

	}

	if (dentry->d_inode == NULL) {

		if (!dentry->d_op)

			d_set_d_op(dentry, &rpc_dentry_operations);

	if (dentry->d_inode == NULL)

		return dentry;

	}

	dput(dentry);

	return ERR_PTR(-EEXIST);

}
@@ -1117,6 +1131,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent) 
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;

	sb->s_magic = RPCAUTH_GSSMAGIC;

	sb->s_op = &s_ops;

	sb->s_d_op = &rpc_dentry_operations;

	sb->s_time_gran = 1;



	inode = rpc_get_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);