483 bool mount_capable(struct fs_context *fc)  in mount_capable()  argument
485 	if (!(fc->fs_type->fs_flags & FS_USERNS_MOUNT))  in mount_capable()
488 		return ns_capable(fc->user_ns, CAP_SYS_ADMIN);  in mount_capable()
509 struct super_block *sget_fc(struct fs_context *fc,  in sget_fc()  argument
515 	struct user_namespace *user_ns = fc->global ? &init_user_ns : fc->user_ns;  in sget_fc()
521 		hlist_for_each_entry(old, &fc->fs_type->fs_supers, s_instances) {  in sget_fc()
522 			if (test(old, fc))  in sget_fc()
528 		s = alloc_super(fc->fs_type, fc->sb_flags, user_ns);  in sget_fc()
534 	s->s_fs_info = fc->s_fs_info;  in sget_fc()
535 	err = set(s, fc);  in sget_fc()
542 	fc->s_fs_info = NULL;  in sget_fc()
543 	s->s_type = fc->fs_type;  in sget_fc()
544 	s->s_iflags |= fc->s_iflags;  in sget_fc()
901 int reconfigure_super(struct fs_context *fc)  in reconfigure_super()  argument
903 	struct super_block *sb = fc->root->d_sb;  in reconfigure_super()
906 	bool force = fc->sb_flags & SB_FORCE;  in reconfigure_super()
908 	if (fc->sb_flags_mask & ~MS_RMT_MASK)  in reconfigure_super()
913 	retval = security_sb_remount(sb, fc->security);  in reconfigure_super()
917 	if (fc->sb_flags_mask & SB_RDONLY) {  in reconfigure_super()
919 		if (!(fc->sb_flags & SB_RDONLY) && bdev_read_only(sb->s_bdev))  in reconfigure_super()
923 		remount_ro = (fc->sb_flags & SB_RDONLY) && !sb_rdonly(sb);  in reconfigure_super()
954 	if (fc->ops->reconfigure) {  in reconfigure_super()
955 		retval = fc->ops->reconfigure(fc);  in reconfigure_super()
965 	WRITE_ONCE(sb->s_flags, ((sb->s_flags & ~fc->sb_flags_mask) |  in reconfigure_super()
966 				 (fc->sb_flags & fc->sb_flags_mask)));  in reconfigure_super()
993 		struct fs_context *fc;  in do_emergency_remount_callback()  local
995 		fc = fs_context_for_reconfigure(sb->s_root,  in do_emergency_remount_callback()
997 		if (!IS_ERR(fc)) {  in do_emergency_remount_callback()
998 			if (parse_monolithic_mount_data(fc, NULL) == 0)  in do_emergency_remount_callback()
999 				(void)reconfigure_super(fc);  in do_emergency_remount_callback()
1000 			put_fs_context(fc);  in do_emergency_remount_callback()
1119 int set_anon_super_fc(struct super_block *sb, struct fs_context *fc)  in set_anon_super_fc()  argument
1125 static int test_keyed_super(struct super_block *sb, struct fs_context *fc)  in test_keyed_super()  argument
1127 	return sb->s_fs_info == fc->s_fs_info;  in test_keyed_super()
1130 static int test_single_super(struct super_block *s, struct fs_context *fc)  in test_single_super()  argument
1160 int vfs_get_super(struct fs_context *fc,  in vfs_get_super()  argument
1163 				    struct fs_context *fc))  in vfs_get_super()
1184 	sb = sget_fc(fc, test, set_anon_super_fc);  in vfs_get_super()
1189 		err = fill_super(sb, fc);  in vfs_get_super()
1194 		fc->root = dget(sb->s_root);  in vfs_get_super()
1196 		fc->root = dget(sb->s_root);  in vfs_get_super()
1198 			err = reconfigure_super(fc);  in vfs_get_super()
1200 				dput(fc->root);  in vfs_get_super()
1201 				fc->root = NULL;  in vfs_get_super()
1215 int get_tree_nodev(struct fs_context *fc,  in get_tree_nodev()  argument
1217 				    struct fs_context *fc))  in get_tree_nodev()
1219 	return vfs_get_super(fc, vfs_get_independent_super, fill_super);  in get_tree_nodev()
1223 int get_tree_single(struct fs_context *fc,  in get_tree_single()  argument
1225 				    struct fs_context *fc))  in get_tree_single()
1227 	return vfs_get_super(fc, vfs_get_single_super, fill_super);  in get_tree_single()
1231 int get_tree_single_reconf(struct fs_context *fc,  in get_tree_single_reconf()  argument
1233 				    struct fs_context *fc))  in get_tree_single_reconf()
1235 	return vfs_get_super(fc, vfs_get_single_reconf_super, fill_super);  in get_tree_single_reconf()
1239 int get_tree_keyed(struct fs_context *fc,  in get_tree_keyed()  argument
1241 				    struct fs_context *fc),  in get_tree_keyed()  argument
1244 	fc->s_fs_info = key;  in get_tree_keyed()
1245 	return vfs_get_super(fc, vfs_get_keyed_super, fill_super);  in get_tree_keyed()
1260 static int set_bdev_super_fc(struct super_block *s, struct fs_context *fc)  in set_bdev_super_fc()  argument
1262 	return set_bdev_super(s, fc->sget_key);  in set_bdev_super_fc()
1265 static int test_bdev_super_fc(struct super_block *s, struct fs_context *fc)  in test_bdev_super_fc()  argument
1267 	return s->s_bdev == fc->sget_key;  in test_bdev_super_fc()
1275 int get_tree_bdev(struct fs_context *fc,  in get_tree_bdev()  argument
1284 	if (!(fc->sb_flags & SB_RDONLY))  in get_tree_bdev()
1287 	if (!fc->source)  in get_tree_bdev()
1288 		return invalf(fc, "No source specified");  in get_tree_bdev()
1290 	bdev = blkdev_get_by_path(fc->source, mode, fc->fs_type);  in get_tree_bdev()
1292 		errorf(fc, "%s: Can't open blockdev", fc->source);  in get_tree_bdev()
1304 		warnf(fc, "%pg: Can't mount, blockdev is frozen", bdev);  in get_tree_bdev()
1308 	fc->sb_flags |= SB_NOSEC;  in get_tree_bdev()
1309 	fc->sget_key = bdev;  in get_tree_bdev()
1310 	s = sget_fc(fc, test_bdev_super_fc, set_bdev_super_fc);  in get_tree_bdev()
1319 		if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {  in get_tree_bdev()
1320 			warnf(fc, "%pg: Can't mount, would change RO state", bdev);  in get_tree_bdev()
1340 		error = fill_super(s, fc);  in get_tree_bdev()
1350 	BUG_ON(fc->root);  in get_tree_bdev()
1351 	fc->root = dget(s->s_root);  in get_tree_bdev()
1474 	struct fs_context *fc;  in reconfigure_single()  local
1482 	fc = fs_context_for_reconfigure(s->s_root, flags, MS_RMT_MASK);  in reconfigure_single()
1483 	if (IS_ERR(fc))  in reconfigure_single()
1484 		return PTR_ERR(fc);  in reconfigure_single()
1486 	ret = parse_monolithic_mount_data(fc, data);  in reconfigure_single()
1490 	ret = reconfigure_super(fc);  in reconfigure_single()
1492 	put_fs_context(fc);  in reconfigure_single()
1534 int vfs_get_tree(struct fs_context *fc)  in vfs_get_tree()  argument
1539 	if (fc->root)  in vfs_get_tree()
1545 	error = fc->ops->get_tree(fc);  in vfs_get_tree()
1549 	if (!fc->root) {  in vfs_get_tree()
1551 		       fc->fs_type->name);  in vfs_get_tree()
1558 	sb = fc->root->d_sb;  in vfs_get_tree()
1570 	error = security_sb_set_mnt_opts(sb, fc->security, 0, NULL);  in vfs_get_tree()
1572 		fc_drop_locked(fc);  in vfs_get_tree()
1583 		"negative value (%lld)\n", fc->fs_type->name, sb->s_maxbytes);  in vfs_get_tree()