[PATCH 4/5] xfs: use ->readlink to implement the readlink_by_handle ioctl

[Christoph Hellwig]

Also drop the now unused readlink_copy export.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 fs/namei.c         |  1 -
 fs/xfs/xfs_ioctl.c | 19 ++-----------------
 2 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index c83145a..482c6a9 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4420,7 +4420,6 @@ int readlink_copy(char __user *buffer, int buflen, const char *link)
 out:
 	return len;
 }
-EXPORT_SYMBOL(readlink_copy);
 
 /*
  * A helper for ->readlink().  This should be used *ONLY* for symlinks that
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 5f4a396..597609e 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -276,7 +276,6 @@ xfs_readlink_by_handle(
 {
 	struct dentry		*dentry;
 	__u32			olen;
-	void			*link;
 	int			error;
 
 	if (!capable(CAP_SYS_ADMIN))
@@ -287,7 +286,7 @@ xfs_readlink_by_handle(
 		return PTR_ERR(dentry);
 
 	/* Restrict this handle operation to symlinks only. */
-	if (!d_is_symlink(dentry)) {
+	if (!dentry->d_inode->i_op->readlink) {
 		error = -EINVAL;
 		goto out_dput;
 	}
@@ -297,21 +296,7 @@ xfs_readlink_by_handle(
 		goto out_dput;
 	}
 
-	link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
-	if (!link) {
-		error = -ENOMEM;
-		goto out_dput;
-	}
-
-	error = xfs_readlink(XFS_I(dentry->d_inode), link);
-	if (error)
-		goto out_kfree;
-	error = readlink_copy(hreq->ohandle, olen, link);
-	if (error)
-		goto out_kfree;
-
- out_kfree:
-	kfree(link);
+	error = dentry->d_inode->i_op->readlink(dentry, hreq->ohandle, olen);
  out_dput:
 	dput(dentry);
 	return error;
-- 
1.9.1