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rpc_pipe: set dentry operations at d_alloc time

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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: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Jeff Layton 2013-07-02 13:00:52 -04:00 committed by Trond Myklebust
parent cda57a1ef6
commit 76fa666579
1 changed files with 20 additions and 5 deletions
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25
net/sunrpc/rpc_pipe.c
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@ -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);