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-rw-r--r--fs/ntfs/namei.c31
1 files changed, 29 insertions, 2 deletions
diff --git a/fs/ntfs/namei.c b/fs/ntfs/namei.c
index 7c7e13b43b2..d261e25bd9b 100644
--- a/fs/ntfs/namei.c
+++ b/fs/ntfs/namei.c
@@ -380,7 +380,7 @@ struct inode_operations ntfs_dir_inode_ops = {
* Return the dentry of the parent directory on success or the error code on
* error (IS_ERR() is true).
*/
-struct dentry *ntfs_get_parent(struct dentry *child_dent)
+static struct dentry *ntfs_get_parent(struct dentry *child_dent)
{
struct inode *vi = child_dent->d_inode;
ntfs_inode *ni = NTFS_I(vi);
@@ -465,7 +465,7 @@ try_next:
*
* Return the dentry on success or the error code on error (IS_ERR() is true).
*/
-struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh)
+static struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh)
{
struct inode *vi;
struct dentry *dent;
@@ -496,3 +496,30 @@ struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh)
ntfs_debug("Done for inode 0x%lx, generation 0x%x.", ino, gen);
return dent;
}
+
+/**
+ * Export operations allowing NFS exporting of mounted NTFS partitions.
+ *
+ * We use the default ->decode_fh() and ->encode_fh() for now. Note that they
+ * use 32 bits to store the inode number which is an unsigned long so on 64-bit
+ * architectures is usually 64 bits so it would all fail horribly on huge
+ * volumes. I guess we need to define our own encode and decode fh functions
+ * that store 64-bit inode numbers at some point but for now we will ignore the
+ * problem...
+ *
+ * We also use the default ->get_name() helper (used by ->decode_fh() via
+ * fs/exportfs/expfs.c::find_exported_dentry()) as that is completely fs
+ * independent.
+ *
+ * The default ->get_parent() just returns -EACCES so we have to provide our
+ * own and the default ->get_dentry() is incompatible with NTFS due to not
+ * allowing the inode number 0 which is used in NTFS for the system file $MFT
+ * and due to using iget() whereas NTFS needs ntfs_iget().
+ */
+struct export_operations ntfs_export_ops = {
+ .get_parent = ntfs_get_parent, /* Find the parent of a given
+ directory. */
+ .get_dentry = ntfs_get_dentry, /* Find a dentry for the inode
+ given a file handle
+ sub-fragment. */
+};