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authorJeff Layton <jlayton@redhat.com>2013-07-02 21:00:52 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-07-10 01:16:39 +0400
commit76fa66657900071016f2bae61de28f059f3f2abf (patch)
tree79fa6e7b03a149acaa1c6ac1ca29b5c6b6c05685 /net/sunrpc/rpc_pipe.c
parentcda57a1ef6f0da7e24f392ffdf00538ec0480310 (diff)
downloadlinux-76fa66657900071016f2bae61de28f059f3f2abf.tar.xz
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: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/rpc_pipe.c')
-rw-r--r--net/sunrpc/rpc_pipe.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 4679df5a6d50..c5f6812ca06a 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -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);