735 bool mount_capable(struct fs_context *fc)  in mount_capable()  argument
737 	if (!(fc->fs_type->fs_flags & FS_USERNS_MOUNT))  in mount_capable()
740 		return ns_capable(fc->user_ns, CAP_SYS_ADMIN);  in mount_capable()
775 struct super_block *sget_fc(struct fs_context *fc,  in sget_fc()  argument
781 	struct user_namespace *user_ns = fc->global ? &init_user_ns : fc->user_ns;  in sget_fc()
787 		hlist_for_each_entry(old, &fc->fs_type->fs_supers, s_instances) {  in sget_fc()
788 			if (test(old, fc))  in sget_fc()
794 		s = alloc_super(fc->fs_type, fc->sb_flags, user_ns);  in sget_fc()
800 	s->s_fs_info = fc->s_fs_info;  in sget_fc()
801 	err = set(s, fc);  in sget_fc()
808 	fc->s_fs_info = NULL;  in sget_fc()
809 	s->s_type = fc->fs_type;  in sget_fc()
810 	s->s_iflags |= fc->s_iflags;  in sget_fc()
825 	if (user_ns != old->s_user_ns || fc->exclusive) {  in sget_fc()
828 		if (fc->exclusive)  in sget_fc()
829 			warnfc(fc, "reusing existing filesystem not allowed");  in sget_fc()
831 			warnfc(fc, "reusing existing filesystem in another namespace not allowed");  in sget_fc()
1079 int reconfigure_super(struct fs_context *fc)  in reconfigure_super()  argument
1081 	struct super_block *sb = fc->root->d_sb;  in reconfigure_super()
1085 	bool force = fc->sb_flags & SB_FORCE;  in reconfigure_super()
1087 	if (fc->sb_flags_mask & ~MS_RMT_MASK)  in reconfigure_super()
1092 	retval = security_sb_remount(sb, fc->security);  in reconfigure_super()
1096 	if (fc->sb_flags_mask & SB_RDONLY) {  in reconfigure_super()
1098 		if (!(fc->sb_flags & SB_RDONLY) && sb->s_bdev &&  in reconfigure_super()
1102 		remount_rw = !(fc->sb_flags & SB_RDONLY) && sb_rdonly(sb);  in reconfigure_super()
1103 		remount_ro = (fc->sb_flags & SB_RDONLY) && !sb_rdonly(sb);  in reconfigure_super()
1139 	if (fc->ops->reconfigure) {  in reconfigure_super()
1140 		retval = fc->ops->reconfigure(fc);  in reconfigure_super()
1150 	WRITE_ONCE(sb->s_flags, ((sb->s_flags & ~fc->sb_flags_mask) |  in reconfigure_super()
1151 				 (fc->sb_flags & fc->sb_flags_mask)));  in reconfigure_super()
1176 		struct fs_context *fc;  in do_emergency_remount_callback()  local
1178 		fc = fs_context_for_reconfigure(sb->s_root,  in do_emergency_remount_callback()
1180 		if (!IS_ERR(fc)) {  in do_emergency_remount_callback()
1181 			if (parse_monolithic_mount_data(fc, NULL) == 0)  in do_emergency_remount_callback()
1182 				(void)reconfigure_super(fc);  in do_emergency_remount_callback()
1183 			put_fs_context(fc);  in do_emergency_remount_callback()
1306 int set_anon_super_fc(struct super_block *sb, struct fs_context *fc)  in set_anon_super_fc()  argument
1312 static int test_keyed_super(struct super_block *sb, struct fs_context *fc)  in test_keyed_super()  argument
1314 	return sb->s_fs_info == fc->s_fs_info;  in test_keyed_super()
1317 static int test_single_super(struct super_block *s, struct fs_context *fc)  in test_single_super()  argument
1322 static int vfs_get_super(struct fs_context *fc,  in vfs_get_super()  argument
1325 				  struct fs_context *fc))  in vfs_get_super()
1330 	sb = sget_fc(fc, test, set_anon_super_fc);  in vfs_get_super()
1335 		err = fill_super(sb, fc);  in vfs_get_super()
1342 	fc->root = dget(sb->s_root);  in vfs_get_super()
1350 int get_tree_nodev(struct fs_context *fc,  in get_tree_nodev()  argument
1352 				    struct fs_context *fc))  in get_tree_nodev()
1354 	return vfs_get_super(fc, NULL, fill_super);  in get_tree_nodev()
1358 int get_tree_single(struct fs_context *fc,  in get_tree_single()  argument
1360 				    struct fs_context *fc))  in get_tree_single()
1362 	return vfs_get_super(fc, test_single_super, fill_super);  in get_tree_single()
1366 int get_tree_keyed(struct fs_context *fc,  in get_tree_keyed()  argument
1368 				    struct fs_context *fc),  in get_tree_keyed()  argument
1371 	fc->s_fs_info = key;  in get_tree_keyed()
1372 	return vfs_get_super(fc, test_keyed_super, fill_super);  in get_tree_keyed()
1382 static int super_s_dev_set(struct super_block *s, struct fs_context *fc)  in super_s_dev_set()  argument
1384 	return set_bdev_super(s, fc->sget_key);  in super_s_dev_set()
1387 static int super_s_dev_test(struct super_block *s, struct fs_context *fc)  in super_s_dev_test()  argument
1390 		s->s_dev == *(dev_t *)fc->sget_key;  in super_s_dev_test()
1413 struct super_block *sget_dev(struct fs_context *fc, dev_t dev)  in sget_dev()  argument
1415 	fc->sget_key = &dev;  in sget_dev()
1416 	return sget_fc(fc, super_s_dev_test, super_s_dev_set);  in sget_dev()
1479 		struct fs_context *fc)  in setup_bdev_super()  argument
1486 		if (fc)  in setup_bdev_super()
1487 			errorf(fc, "%s: Can't open blockdev", fc->source);  in setup_bdev_super()
1511 		if (fc)  in setup_bdev_super()
1512 			warnf(fc, "%pg: Can't mount, blockdev is frozen", bdev);  in setup_bdev_super()
1537 int get_tree_bdev(struct fs_context *fc,  in get_tree_bdev()  argument
1545 	if (!fc->source)  in get_tree_bdev()
1546 		return invalf(fc, "No source specified");  in get_tree_bdev()
1548 	error = lookup_bdev(fc->source, &dev);  in get_tree_bdev()
1550 		errorf(fc, "%s: Can't lookup blockdev", fc->source);  in get_tree_bdev()
1554 	fc->sb_flags |= SB_NOSEC;  in get_tree_bdev()
1555 	s = sget_dev(fc, dev);  in get_tree_bdev()
1561 		if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {  in get_tree_bdev()
1562 			warnf(fc, "%pg: Can't mount, would change RO state", s->s_bdev);  in get_tree_bdev()
1574 		error = setup_bdev_super(s, fc->sb_flags, fc);  in get_tree_bdev()
1577 			error = fill_super(s, fc);  in get_tree_bdev()
1585 	BUG_ON(fc->root);  in get_tree_bdev()
1586 	fc->root = dget(s->s_root);  in get_tree_bdev()
1679 	struct fs_context *fc;  in reconfigure_single()  local
1687 	fc = fs_context_for_reconfigure(s->s_root, flags, MS_RMT_MASK);  in reconfigure_single()
1688 	if (IS_ERR(fc))  in reconfigure_single()
1689 		return PTR_ERR(fc);  in reconfigure_single()
1691 	ret = parse_monolithic_mount_data(fc, data);  in reconfigure_single()
1695 	ret = reconfigure_super(fc);  in reconfigure_single()
1697 	put_fs_context(fc);  in reconfigure_single()
1739 int vfs_get_tree(struct fs_context *fc)  in vfs_get_tree()  argument
1744 	if (fc->root)  in vfs_get_tree()
1750 	error = fc->ops->get_tree(fc);  in vfs_get_tree()
1754 	if (!fc->root) {  in vfs_get_tree()
1756 		       fc->fs_type->name);  in vfs_get_tree()
1763 	sb = fc->root->d_sb;  in vfs_get_tree()
1775 	error = security_sb_set_mnt_opts(sb, fc->security, 0, NULL);  in vfs_get_tree()
1777 		fc_drop_locked(fc);  in vfs_get_tree()
1788 		"negative value (%lld)\n", fc->fs_type->name, sb->s_maxbytes);  in vfs_get_tree()