[RFC v2 61/83] Super: Add nova_export_ops.

Andiry Xu
2018-03-10T18:29:44Z

fs/nova/super.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)

diff --git a/fs/nova/super.c b/fs/nova/super.c
index daf3270..0847e57 100644
--- a/fs/nova/super.c
+++ b/fs/nova/super.c
@@ -51,6 +51,7 @@ module_param(nova_dbgmask, int, 0444);
MODULE_PARM_DESC(nova_dbgmask, "Control debugging output");

static struct super_operations nova_sops;
+static const struct export_operations nova_export_ops;

static struct kmem_cache *nova_inode_cachep;
static struct kmem_cache *nova_range_node_cachep;
@@ -631,6 +632,7 @@ static int nova_fill_super(struct super_block *sb, void *data, int silent)
sb->s_op = &nova_sops;
sb->s_maxbytes = nova_max_size(sb->s_blocksize_bits);
sb->s_time_gran = 1000000000; // 1 second.
+ sb->s_export_op = &nova_export_ops;
sb->s_xattr = NULL;
sb->s_flags |= MS_NOSEC;

@@ -904,6 +906,52 @@ static struct file_system_type nova_fs_type = {
.kill_sb = kill_block_super,
};

+static struct inode *nova_nfs_get_inode(struct super_block *sb,
+ u64 ino, u32 generation)
+{
+ struct inode *inode;
+
+ if (ino < NOVA_ROOT_INO)
+ return ERR_PTR(-ESTALE);
+
+ if (ino > LONG_MAX)
+ return ERR_PTR(-ESTALE);
+
+ inode = nova_iget(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+
+ if (generation && inode->i_generation != generation) {
+ /* we didn't find the right inode.. */
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+
+ return inode;
+}
+
+static struct dentry *nova_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len,
+ int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ nova_nfs_get_inode);
+}
+
+static struct dentry *nova_fh_to_parent(struct super_block *sb,
+ struct fid *fid, int fh_len,
+ int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ nova_nfs_get_inode);
+}
+
+static const struct export_operations nova_export_ops = {
+ .fh_to_dentry = nova_fh_to_dentry,
+ .fh_to_parent = nova_fh_to_parent,
+ .get_parent = nova_get_parent,
+};
+
static int __init init_nova_fs(void)
{
int rc = 0;
--
2.7.4