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-rw-r--r--kernel/bpf/inode.c40
1 files changed, 9 insertions, 31 deletions
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 8f94ca1860cf..318858edb1cd 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -119,18 +119,10 @@ static int bpf_inode_type(const struct inode *inode, enum bpf_type *type)
return 0;
}
-static bool bpf_dname_reserved(const struct dentry *dentry)
-{
- return strchr(dentry->d_name.name, '.');
-}
-
static int bpf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
struct inode *inode;
- if (bpf_dname_reserved(dentry))
- return -EPERM;
-
inode = bpf_get_inode(dir->i_sb, dir, mode | S_IFDIR);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -152,9 +144,6 @@ static int bpf_mkobj_ops(struct inode *dir, struct dentry *dentry,
{
struct inode *inode;
- if (bpf_dname_reserved(dentry))
- return -EPERM;
-
inode = bpf_get_inode(dir->i_sb, dir, mode | S_IFREG);
if (IS_ERR(inode))
return PTR_ERR(inode);
@@ -187,31 +176,21 @@ static int bpf_mkobj(struct inode *dir, struct dentry *dentry, umode_t mode,
}
}
-static int bpf_link(struct dentry *old_dentry, struct inode *dir,
- struct dentry *new_dentry)
+static struct dentry *
+bpf_lookup(struct inode *dir, struct dentry *dentry, unsigned flags)
{
- if (bpf_dname_reserved(new_dentry))
- return -EPERM;
-
- return simple_link(old_dentry, dir, new_dentry);
-}
-
-static int bpf_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
-{
- if (bpf_dname_reserved(new_dentry))
- return -EPERM;
-
- return simple_rename(old_dir, old_dentry, new_dir, new_dentry);
+ if (strchr(dentry->d_name.name, '.'))
+ return ERR_PTR(-EPERM);
+ return simple_lookup(dir, dentry, flags);
}
static const struct inode_operations bpf_dir_iops = {
- .lookup = simple_lookup,
+ .lookup = bpf_lookup,
.mknod = bpf_mkobj,
.mkdir = bpf_mkdir,
.rmdir = simple_rmdir,
- .rename = bpf_rename,
- .link = bpf_link,
+ .rename = simple_rename,
+ .link = simple_link,
.unlink = simple_unlink,
};
@@ -378,7 +357,7 @@ static int bpf_fill_super(struct super_block *sb, void *data, int silent)
static struct dentry *bpf_mount(struct file_system_type *type, int flags,
const char *dev_name, void *data)
{
- return mount_ns(type, flags, current->nsproxy->mnt_ns, bpf_fill_super);
+ return mount_nodev(type, flags, data, bpf_fill_super);
}
static struct file_system_type bpf_fs_type = {
@@ -386,7 +365,6 @@ static struct file_system_type bpf_fs_type = {
.name = "bpf",
.mount = bpf_mount,
.kill_sb = kill_litter_super,
- .fs_flags = FS_USERNS_MOUNT,
};
MODULE_ALIAS_FS("bpf");