515 bool mount_capable(struct fs_context *fc)  in mount_capable()  argument
517 	if (!(fc->fs_type->fs_flags & FS_USERNS_MOUNT))  in mount_capable()
520 		return ns_capable(fc->user_ns, CAP_SYS_ADMIN);  in mount_capable()
541 struct super_block *sget_fc(struct fs_context *fc,  in sget_fc()  argument
547 	struct user_namespace *user_ns = fc->global ? &init_user_ns : fc->user_ns;  in sget_fc()
553 		hlist_for_each_entry(old, &fc->fs_type->fs_supers, s_instances) {  in sget_fc()
554 			if (test(old, fc))  in sget_fc()
560 		s = alloc_super(fc->fs_type, fc->sb_flags, user_ns);  in sget_fc()
566 	s->s_fs_info = fc->s_fs_info;  in sget_fc()
567 	err = set(s, fc);  in sget_fc()
574 	fc->s_fs_info = NULL;  in sget_fc()
575 	s->s_type = fc->fs_type;  in sget_fc()
576 	s->s_iflags |= fc->s_iflags;  in sget_fc()
880 int reconfigure_super(struct fs_context *fc)  in reconfigure_super()  argument
882 	struct super_block *sb = fc->root->d_sb;  in reconfigure_super()
885 	bool force = fc->sb_flags & SB_FORCE;  in reconfigure_super()
887 	if (fc->sb_flags_mask & ~MS_RMT_MASK)  in reconfigure_super()
892 	retval = security_sb_remount(sb, fc->security);  in reconfigure_super()
896 	if (fc->sb_flags_mask & SB_RDONLY) {  in reconfigure_super()
898 		if (!(fc->sb_flags & SB_RDONLY) && sb->s_bdev &&  in reconfigure_super()
903 		remount_ro = (fc->sb_flags & SB_RDONLY) && !sb_rdonly(sb);  in reconfigure_super()
934 	if (fc->ops->reconfigure) {  in reconfigure_super()
935 		retval = fc->ops->reconfigure(fc);  in reconfigure_super()
945 	WRITE_ONCE(sb->s_flags, ((sb->s_flags & ~fc->sb_flags_mask) |  in reconfigure_super()
946 				 (fc->sb_flags & fc->sb_flags_mask)));  in reconfigure_super()
973 		struct fs_context *fc;  in do_emergency_remount_callback()  local
975 		fc = fs_context_for_reconfigure(sb->s_root,  in do_emergency_remount_callback()
977 		if (!IS_ERR(fc)) {  in do_emergency_remount_callback()
978 			if (parse_monolithic_mount_data(fc, NULL) == 0)  in do_emergency_remount_callback()
979 				(void)reconfigure_super(fc);  in do_emergency_remount_callback()
980 			put_fs_context(fc);  in do_emergency_remount_callback()
1099 int set_anon_super_fc(struct super_block *sb, struct fs_context *fc)  in set_anon_super_fc()  argument
1105 static int test_keyed_super(struct super_block *sb, struct fs_context *fc)  in test_keyed_super()  argument
1107 	return sb->s_fs_info == fc->s_fs_info;  in test_keyed_super()
1110 static int test_single_super(struct super_block *s, struct fs_context *fc)  in test_single_super()  argument
1140 int vfs_get_super(struct fs_context *fc,  in vfs_get_super()  argument
1143 				    struct fs_context *fc))  in vfs_get_super()
1164 	sb = sget_fc(fc, test, set_anon_super_fc);  in vfs_get_super()
1169 		err = fill_super(sb, fc);  in vfs_get_super()
1174 		fc->root = dget(sb->s_root);  in vfs_get_super()
1176 		fc->root = dget(sb->s_root);  in vfs_get_super()
1178 			err = reconfigure_super(fc);  in vfs_get_super()
1180 				dput(fc->root);  in vfs_get_super()
1181 				fc->root = NULL;  in vfs_get_super()
1195 int get_tree_nodev(struct fs_context *fc,  in get_tree_nodev()  argument
1197 				    struct fs_context *fc))  in get_tree_nodev()
1199 	return vfs_get_super(fc, vfs_get_independent_super, fill_super);  in get_tree_nodev()
1203 int get_tree_single(struct fs_context *fc,  in get_tree_single()  argument
1205 				    struct fs_context *fc))  in get_tree_single()
1207 	return vfs_get_super(fc, vfs_get_single_super, fill_super);  in get_tree_single()
1211 int get_tree_single_reconf(struct fs_context *fc,  in get_tree_single_reconf()  argument
1213 				    struct fs_context *fc))  in get_tree_single_reconf()
1215 	return vfs_get_super(fc, vfs_get_single_reconf_super, fill_super);  in get_tree_single_reconf()
1219 int get_tree_keyed(struct fs_context *fc,  in get_tree_keyed()  argument
1221 				    struct fs_context *fc),  in get_tree_keyed()  argument
1224 	fc->s_fs_info = key;  in get_tree_keyed()
1225 	return vfs_get_super(fc, vfs_get_keyed_super, fill_super);  in get_tree_keyed()
1242 static int set_bdev_super_fc(struct super_block *s, struct fs_context *fc)  in set_bdev_super_fc()  argument
1244 	return set_bdev_super(s, fc->sget_key);  in set_bdev_super_fc()
1247 static int test_bdev_super_fc(struct super_block *s, struct fs_context *fc)  in test_bdev_super_fc()  argument
1249 	return !(s->s_iflags & SB_I_RETIRED) && s->s_bdev == fc->sget_key;  in test_bdev_super_fc()
1257 int get_tree_bdev(struct fs_context *fc,  in get_tree_bdev()  argument
1266 	if (!(fc->sb_flags & SB_RDONLY))  in get_tree_bdev()
1269 	if (!fc->source)  in get_tree_bdev()
1270 		return invalf(fc, "No source specified");  in get_tree_bdev()
1272 	bdev = blkdev_get_by_path(fc->source, mode, fc->fs_type);  in get_tree_bdev()
1274 		errorf(fc, "%s: Can't open blockdev", fc->source);  in get_tree_bdev()
1285 		warnf(fc, "%pg: Can't mount, blockdev is frozen", bdev);  in get_tree_bdev()
1290 	fc->sb_flags |= SB_NOSEC;  in get_tree_bdev()
1291 	fc->sget_key = bdev;  in get_tree_bdev()
1292 	s = sget_fc(fc, test_bdev_super_fc, set_bdev_super_fc);  in get_tree_bdev()
1301 		if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {  in get_tree_bdev()
1302 			warnf(fc, "%pg: Can't mount, would change RO state", bdev);  in get_tree_bdev()
1322 					fc->fs_type->name, s->s_id);  in get_tree_bdev()
1324 		error = fill_super(s, fc);  in get_tree_bdev()
1334 	BUG_ON(fc->root);  in get_tree_bdev()
1335 	fc->root = dget(s->s_root);  in get_tree_bdev()
1460 	struct fs_context *fc;  in reconfigure_single()  local
1468 	fc = fs_context_for_reconfigure(s->s_root, flags, MS_RMT_MASK);  in reconfigure_single()
1469 	if (IS_ERR(fc))  in reconfigure_single()
1470 		return PTR_ERR(fc);  in reconfigure_single()
1472 	ret = parse_monolithic_mount_data(fc, data);  in reconfigure_single()
1476 	ret = reconfigure_super(fc);  in reconfigure_single()
1478 	put_fs_context(fc);  in reconfigure_single()
1520 int vfs_get_tree(struct fs_context *fc)  in vfs_get_tree()  argument
1525 	if (fc->root)  in vfs_get_tree()
1531 	error = fc->ops->get_tree(fc);  in vfs_get_tree()
1535 	if (!fc->root) {  in vfs_get_tree()
1537 		       fc->fs_type->name);  in vfs_get_tree()
1544 	sb = fc->root->d_sb;  in vfs_get_tree()
1556 	error = security_sb_set_mnt_opts(sb, fc->security, 0, NULL);  in vfs_get_tree()
1558 		fc_drop_locked(fc);  in vfs_get_tree()
1569 		"negative value (%lld)\n", fc->fs_type->name, sb->s_maxbytes);  in vfs_get_tree()