ufs: NFS support

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Evgeniy Dushistov <dushistov@mail.ru>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 5faed7954d0a..143c20bfb04b 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -66,6 +66,7 @@
  */
 
 
+#include <linux/exportfs.h>
 #include <linux/module.h>
 #include <linux/bitops.h>
 
@@ -96,6 +97,56 @@
 #include "swab.h"
 #include "util.h"
 
+static struct inode *ufs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
+{
+        struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+        struct inode *inode;
+
+        if (ino < UFS_ROOTINO || ino > uspi->s_ncg * uspi->s_ipg)
+                return ERR_PTR(-ESTALE);
+
+        inode = ufs_iget(sb, ino);
+        if (IS_ERR(inode))
+                return ERR_CAST(inode);
+        if (generation && inode->i_generation != generation) {
+                iput(inode);
+                return ERR_PTR(-ESTALE);
+        }
+        return inode;
+}
+
+static struct dentry *ufs_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, ufs_nfs_get_inode);
+}
+
+static struct dentry *ufs_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, ufs_nfs_get_inode);
+}
+
+static struct dentry *ufs_get_parent(struct dentry *child)
+{
+        struct qstr dot_dot = {
+                .name   = "..",
+                .len    = 2,
+        };
+        ino_t ino;
+
+        ino = ufs_inode_by_name(child->d_inode, &dot_dot);
+        if (!ino)
+                return ERR_PTR(-ENOENT);
+        return d_obtain_alias(ufs_iget(child->d_inode->i_sb, ino));
+}
+
+static const struct export_operations ufs_export_ops = {
+        .fh_to_dentry   = ufs_fh_to_dentry,
+        .fh_to_parent   = ufs_fh_to_parent,
+        .get_parent     = ufs_get_parent,
+};
+
 #ifdef CONFIG_UFS_DEBUG
 /*
  * Print contents of ufs_super_block, useful for debugging
@@ -990,6 +1041,7 @@ magic_found:
          * Read ufs_super_block into internal data structures
          */
         sb->s_op = &ufs_super_ops;
+        sb->s_export_op = &ufs_export_ops;
         sb->dq_op = NULL; /***/
         sb->s_magic = fs32_to_cpu(sb, usb3->fs_magic);