Linux 3.14 compat: assign inode->set_acl

Linux 3.14 introduces inode->set_acl(). Normally, acl modification will come
from setxattr, which will handle by the acl xattr_handler, and we already
handles that well. However, nfsd will directly calls inode->set_acl or
return error if it doesn't exists.

Reviewed-by: Tim Chase <tim@chase2k.com>
Reviewed-by: Massimo Maggi <me@massimo-maggi.eu>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Closes #5371
Closes #5375

config/kernel-acl.m4

@@ -249,6 +249,31 @@ AC_DEFUN([ZFS_AC_KERNEL_INODE_OPERATIONS_GET_ACL], [
 	])
 ])
 
+dnl #
+dnl # 3.14 API change,
+dnl # Check if inode_operations contains the function set_acl
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_INODE_OPERATIONS_SET_ACL], [
+	AC_MSG_CHECKING([whether iops->set_acl() exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/fs.h>
+
+		int set_acl_fn(struct inode *inode, struct posix_acl *acl, int type)
+		    { return 0; }
+
+		static const struct inode_operations
+		    iops __attribute__ ((unused)) = {
+			.set_acl = set_acl_fn,
+		};
+	],[
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SET_ACL, 1, [iops->set_acl() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
 dnl #
 dnl # 4.7 API change,
 dnl # The kernel get_acl will now check cache before calling i_op->get_acl and

config/kernel.m4

@@ -52,6 +52,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_INODE_OPERATIONS_CHECK_ACL
 	ZFS_AC_KERNEL_INODE_OPERATIONS_CHECK_ACL_WITH_FLAGS
 	ZFS_AC_KERNEL_INODE_OPERATIONS_GET_ACL
+	ZFS_AC_KERNEL_INODE_OPERATIONS_SET_ACL
 	ZFS_AC_KERNE_GET_ACL_HANDLE_CACHE
 	ZFS_AC_KERNEL_SHOW_OPTIONS
 	ZFS_AC_KERNEL_FILE_INODE

include/sys/zpl.h

@@ -76,7 +76,7 @@ extern ssize_t zpl_xattr_list(struct dentry *dentry, char *buf, size_t size);
 extern int zpl_xattr_security_init(struct inode *ip, struct inode *dip,
     const struct qstr *qstr);
 #if defined(CONFIG_FS_POSIX_ACL)
-extern int zpl_set_acl(struct inode *ip, int type, struct posix_acl *acl);
+extern int zpl_set_acl(struct inode *ip, struct posix_acl *acl, int type);
 extern struct posix_acl *zpl_get_acl(struct inode *ip, int type);
 #if !defined(HAVE_GET_ACL)
 #if defined(HAVE_CHECK_ACL_WITH_FLAGS)

module/zfs/zpl_inode.c

@@ -674,6 +674,9 @@ const struct inode_operations zpl_inode_operations = {
 	.fallocate	= zpl_fallocate,
 #endif /* HAVE_INODE_FALLOCATE */
 #if defined(CONFIG_FS_POSIX_ACL)
+#if defined(HAVE_SET_ACL)
+	.set_acl	= zpl_set_acl,
+#endif
 #if defined(HAVE_GET_ACL)
 	.get_acl	= zpl_get_acl,
 #elif defined(HAVE_CHECK_ACL)
@@ -707,6 +710,9 @@ const struct inode_operations zpl_dir_inode_operations = {
 #endif
 	.listxattr	= zpl_xattr_list,
 #if defined(CONFIG_FS_POSIX_ACL)
+#if defined(HAVE_SET_ACL)
+	.set_acl	= zpl_set_acl,
+#endif
 #if defined(HAVE_GET_ACL)
 	.get_acl	= zpl_get_acl,
 #elif defined(HAVE_CHECK_ACL)
@@ -747,6 +753,9 @@ const struct inode_operations zpl_special_inode_operations = {
 #endif
 	.listxattr	= zpl_xattr_list,
 #if defined(CONFIG_FS_POSIX_ACL)
+#if defined(HAVE_SET_ACL)
+	.set_acl	= zpl_set_acl,
+#endif
 #if defined(HAVE_GET_ACL)
 	.get_acl	= zpl_get_acl,
 #elif defined(HAVE_CHECK_ACL)

module/zfs/zpl_xattr.c

@@ -936,7 +936,7 @@ xattr_handler_t zpl_xattr_security_handler = {
  */
 #ifdef CONFIG_FS_POSIX_ACL
 int
-zpl_set_acl(struct inode *ip, int type, struct posix_acl *acl)
+zpl_set_acl(struct inode *ip, struct posix_acl *acl, int type)
 {
 	struct super_block *sb = ITOZSB(ip)->z_sb;
 	char *name, *value = NULL;
@@ -1140,7 +1140,7 @@ zpl_init_acl(struct inode *ip, struct inode *dir)
 		umode_t mode;
 
 		if (S_ISDIR(ip->i_mode)) {
-			error = zpl_set_acl(ip, ACL_TYPE_DEFAULT, acl);
+			error = zpl_set_acl(ip, acl, ACL_TYPE_DEFAULT);
 			if (error)
 				goto out;
 		}
@@ -1151,7 +1151,7 @@ zpl_init_acl(struct inode *ip, struct inode *dir)
 			ip->i_mode = mode;
 			zfs_mark_inode_dirty(ip);
 			if (error > 0)
-				error = zpl_set_acl(ip, ACL_TYPE_ACCESS, acl);
+				error = zpl_set_acl(ip, acl, ACL_TYPE_ACCESS);
 		}
 	}
 out:
@@ -1178,7 +1178,7 @@ zpl_chmod_acl(struct inode *ip)
 
 	error = __posix_acl_chmod(&acl, GFP_KERNEL, ip->i_mode);
 	if (!error)
-		error = zpl_set_acl(ip, ACL_TYPE_ACCESS, acl);
+		error = zpl_set_acl(ip, acl, ACL_TYPE_ACCESS);
 
 	zpl_posix_acl_release(acl);
 
@@ -1308,7 +1308,7 @@ __zpl_xattr_acl_set_access(struct inode *ip, const char *name,
 		acl = NULL;
 	}
 
-	error = zpl_set_acl(ip, type, acl);
+	error = zpl_set_acl(ip, acl, type);
 	zpl_posix_acl_release(acl);
 
 	return (error);
@@ -1348,7 +1348,7 @@ __zpl_xattr_acl_set_default(struct inode *ip, const char *name,
 		acl = NULL;
 	}
 
-	error = zpl_set_acl(ip, type, acl);
+	error = zpl_set_acl(ip, acl, type);
 	zpl_posix_acl_release(acl);
 
 	return (error);