Linux 3.13 compat: Pass NULL for new delegated inode argument

This check was originally added for SLES10, a093c6a, to check for
a 'struct vfsmount *' argument which they added.  However, since
SLES10 is based on a 2.6.16 kernel which is no longer supported
this functionality was dropped.  The checks were refactored to
support Linux 3.13 without concern for historical versions.

Signed-off-by: Richard Yao <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #312

2 files changed, 55 insertions, 19 deletions

diff --git a/config/spl-build.m4 b/config/spl-build.m4
index 7d744db13..84267807d 100644
--- a/config/spl-build.m4
+++ b/config/spl-build.m4
@@ -1842,41 +1842,73 @@ AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
 	EXTRA_KCFLAGS="$tmp_flags"
 ])
 
-dnl #
-dnl # SLES API change, never adopted in mainline,
-dnl # Third 'struct vfsmount *' argument removed.
-dnl #
 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
 	[AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
 	SPL_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
-		vfs_unlink(NULL, NULL);
+		vfs_unlink((struct inode *) NULL, (struct dentry *) NULL);
 	],[
 		AC_MSG_RESULT(yes)
 		AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
 		          [vfs_unlink() wants 2 args])
 	],[
 		AC_MSG_RESULT(no)
+		dnl #
+		dnl # Linux 3.13 API change
+		dnl # Added delegated inode
+		dnl #
+		AC_MSG_CHECKING([whether vfs_unlink() wants 3 args])
+		SPL_LINUX_TRY_COMPILE([
+			#include <linux/fs.h>
+		],[
+			vfs_unlink((struct inode *) NULL,
+				(struct dentry *) NULL,
+				(struct inode **) NULL);
+		],[
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_3ARGS_VFS_UNLINK, 1,
+				  [vfs_unlink() wants 3 args])
+		],[
+			AC_MSG_ERROR(no)
+		])
+
 	])
 ])
 
-dnl #
-dnl # SLES API change, never adopted in mainline,
-dnl # Third and sixth 'struct vfsmount *' argument removed.
-dnl #
 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
 	[AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
 	SPL_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
-		vfs_rename(NULL, NULL, NULL, NULL);
+		vfs_rename((struct inode *) NULL, (struct dentry *) NULL,
+			(struct inode *) NULL, (struct dentry *) NULL);
 	],[
 		AC_MSG_RESULT(yes)
 		AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
 		          [vfs_rename() wants 4 args])
 	],[
 		AC_MSG_RESULT(no)
+		dnl #
+		dnl # Linux 3.13 API change
+		dnl # Added delegated inode
+		dnl #
+		AC_MSG_CHECKING([whether vfs_rename() wants 5 args])
+		SPL_LINUX_TRY_COMPILE([
+			#include <linux/fs.h>
+		],[
+			vfs_rename((struct inode *) NULL,
+				(struct dentry *) NULL,
+				(struct inode *) NULL,
+				(struct dentry *) NULL,
+				(struct inode **) NULL);
+		],[
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_5ARGS_VFS_RENAME, 1,
+				  [vfs_rename() wants 5 args])
+		],[
+			AC_MSG_ERROR(no)
+		])
 	])
 ])
 
diff --git a/module/spl/spl-vnode.c b/module/spl/spl-vnode.c
index 0784ff261..549606770 100644
--- a/module/spl/spl-vnode.c
+++ b/module/spl/spl-vnode.c
@@ -334,7 +334,11 @@ vn_remove(const char *path, uio_seg_t seg, int flags)
 		if (inode)
 			ihold(inode);
 
+#ifdef HAVE_2ARGS_VFS_UNLINK
 		rc = vfs_unlink(parent.dentry->d_inode, dentry);
+#else
+		rc = vfs_unlink(parent.dentry->d_inode, dentry, NULL);
+#endif /* HAVE_2ARGS_VFS_UNLINK */
 exit1:
 		dput(dentry);
 	} else {
@@ -412,10 +416,10 @@ vn_rename(const char *oldname, const char *newname, int x1)
 
 #ifdef HAVE_4ARGS_VFS_RENAME
 	rc = vfs_rename(old_dir->d_inode, old_dentry,
-			new_dir->d_inode, new_dentry);
+	    new_dir->d_inode, new_dentry);
 #else
-	rc = vfs_rename(old_dir->d_inode, old_dentry, oldnd.nd_mnt,
-			new_dir->d_inode, new_dentry, newnd.nd_mnt);
+	rc = vfs_rename(old_dir->d_inode, old_dentry,
+	    new_dir->d_inode, new_dentry, NULL);
 #endif /* HAVE_4ARGS_VFS_RENAME */
 exit4:
 	unlock_rename(new_dir, old_dir);
@@ -478,9 +482,9 @@ vn_remove(const char *path, uio_seg_t seg, int flags)
                 if (inode)
                         atomic_inc(&inode->i_count);
 #ifdef HAVE_2ARGS_VFS_UNLINK
-                rc = vfs_unlink(nd.nd_dentry->d_inode, dentry);
+		rc = vfs_unlink(nd.nd_dentry->d_inode, dentry);
 #else
-                rc = vfs_unlink(nd.nd_dentry->d_inode, dentry, nd.nd_mnt);
+		rc = vfs_unlink(nd.nd_dentry->d_inode, dentry, NULL);
 #endif /* HAVE_2ARGS_VFS_UNLINK */
 exit2:
                 dput(dentry);
@@ -571,11 +575,11 @@ vn_rename(const char *oldname, const char *newname, int x1)
                 SGOTO(exit5, rc);
 
 #ifdef HAVE_4ARGS_VFS_RENAME
-        rc = vfs_rename(old_dir->d_inode, old_dentry,
-                        new_dir->d_inode, new_dentry);
+	rc = vfs_rename(old_dir->d_inode, old_dentry,
+	    new_dir->d_inode, new_dentry);
 #else
-        rc = vfs_rename(old_dir->d_inode, old_dentry, oldnd.nd_mnt,
-                        new_dir->d_inode, new_dentry, newnd.nd_mnt);
+	rc = vfs_rename(old_dir->d_inode, old_dentry,
+	    new_dir->d_inode, new_dentry, NULL);
 #endif /* HAVE_4ARGS_VFS_RENAME */
 exit5:
         dput(new_dentry);