690 bool mount_capable(struct fs_context *fc)  in mount_capable()  argument
692 	if (!(fc->fs_type->fs_flags & FS_USERNS_MOUNT))  in mount_capable()
695 		return ns_capable(fc->user_ns, CAP_SYS_ADMIN);  in mount_capable()
700  * @fc:	Filesystem context.
707  * Whether or not the requested parameters in @fc are taken into account
713  * (1) the namespace the filesystem context @fc and the extant
716  * (2) the filesystem context @fc has requested that reusing an extant
730 struct super_block *sget_fc(struct fs_context *fc,  in sget_fc()  argument
736 	struct user_namespace *user_ns = fc->global ? &init_user_ns : fc->user_ns;  in sget_fc()
745 	if (user_ns != &init_user_ns && !(fc->fs_type->fs_flags & FS_USERNS_MOUNT)) {  in sget_fc()
746 		errorfc(fc, "VFS: Mounting from non-initial user namespace is not allowed");  in sget_fc()
753 		hlist_for_each_entry(old, &fc->fs_type->fs_supers, s_instances) {  in sget_fc()
754 			if (test(old, fc))  in sget_fc()
760 		s = alloc_super(fc->fs_type, fc->sb_flags, user_ns);  in sget_fc()
766 	s->s_fs_info = fc->s_fs_info;  in sget_fc()
767 	err = set(s, fc);  in sget_fc()
774 	fc->s_fs_info = NULL;  in sget_fc()
775 	s->s_type = fc->fs_type;  in sget_fc()
776 	s->s_iflags |= fc->s_iflags;  in sget_fc()
791 	if (user_ns != old->s_user_ns || fc->exclusive) {  in sget_fc()
794 		if (fc->exclusive)  in sget_fc()
795 			warnfc(fc, "reusing existing filesystem not allowed");  in sget_fc()
797 			warnfc(fc, "reusing existing filesystem in another namespace not allowed");  in sget_fc()
1011  * @fc: The superblock and configuration
1015 int reconfigure_super(struct fs_context *fc)  in reconfigure_super()  argument
1017 	struct super_block *sb = fc->root->d_sb;  in reconfigure_super()
1021 	bool force = fc->sb_flags & SB_FORCE;  in reconfigure_super()
1023 	if (fc->sb_flags_mask & ~MS_RMT_MASK)  in reconfigure_super()
1028 	retval = security_sb_remount(sb, fc->security);  in reconfigure_super()
1032 	if (fc->sb_flags_mask & SB_RDONLY) {  in reconfigure_super()
1034 		if (!(fc->sb_flags & SB_RDONLY) && sb->s_bdev &&  in reconfigure_super()
1038 		remount_rw = !(fc->sb_flags & SB_RDONLY) && sb_rdonly(sb);  in reconfigure_super()
1039 		remount_ro = (fc->sb_flags & SB_RDONLY) && !sb_rdonly(sb);  in reconfigure_super()
1075 	if (fc->ops->reconfigure) {  in reconfigure_super()
1076 		retval = fc->ops->reconfigure(fc);  in reconfigure_super()
1086 	WRITE_ONCE(sb->s_flags, ((sb->s_flags & ~fc->sb_flags_mask) |  in reconfigure_super()
1087 				 (fc->sb_flags & fc->sb_flags_mask)));  in reconfigure_super()
1110 		struct fs_context *fc;  in do_emergency_remount_callback()  local
1112 		fc = fs_context_for_reconfigure(sb->s_root,  in do_emergency_remount_callback()
1114 		if (!IS_ERR(fc)) {  in do_emergency_remount_callback()
1115 			if (parse_monolithic_mount_data(fc, NULL) == 0)  in do_emergency_remount_callback()
1116 				(void)reconfigure_super(fc);  in do_emergency_remount_callback()
1117 			put_fs_context(fc);  in do_emergency_remount_callback()
1295 int set_anon_super_fc(struct super_block *sb, struct fs_context *fc)  in set_anon_super_fc()  argument
1301 static int test_keyed_super(struct super_block *sb, struct fs_context *fc)  in test_keyed_super()  argument
1303 	return sb->s_fs_info == fc->s_fs_info;  in test_keyed_super()
1306 static int test_single_super(struct super_block *s, struct fs_context *fc)  in test_single_super()  argument
1311 static int vfs_get_super(struct fs_context *fc,  in vfs_get_super()  argument
1314 				  struct fs_context *fc))  in vfs_get_super()
1319 	sb = sget_fc(fc, test, set_anon_super_fc);  in vfs_get_super()
1324 		err = fill_super(sb, fc);  in vfs_get_super()
1331 	fc->root = dget(sb->s_root);  in vfs_get_super()
1339 int get_tree_nodev(struct fs_context *fc,  in get_tree_nodev()  argument
1341 				    struct fs_context *fc))  in get_tree_nodev()
1343 	return vfs_get_super(fc, NULL, fill_super);  in get_tree_nodev()
1347 int get_tree_single(struct fs_context *fc,  in get_tree_single()  argument
1349 				    struct fs_context *fc))  in get_tree_single()
1351 	return vfs_get_super(fc, test_single_super, fill_super);  in get_tree_single()
1355 int get_tree_keyed(struct fs_context *fc,  in get_tree_keyed()  argument
1357 				    struct fs_context *fc),  in get_tree_keyed()  argument
1360 	fc->s_fs_info = key;  in get_tree_keyed()
1361 	return vfs_get_super(fc, test_keyed_super, fill_super);  in get_tree_keyed()
1371 static int super_s_dev_set(struct super_block *s, struct fs_context *fc)  in super_s_dev_set()  argument
1373 	return set_bdev_super(s, fc->sget_key);  in super_s_dev_set()
1376 static int super_s_dev_test(struct super_block *s, struct fs_context *fc)  in super_s_dev_test()  argument
1379 		s->s_dev == *(dev_t *)fc->sget_key;  in super_s_dev_test()
1384  * @fc: Filesystem context.
1388  * will be stored in fc->sget_key.
1402 struct super_block *sget_dev(struct fs_context *fc, dev_t dev)  in sget_dev()  argument
1404 	fc->sget_key = &dev;  in sget_dev()
1405 	return sget_fc(fc, super_s_dev_test, super_s_dev_set);  in sget_dev()
1603 		struct fs_context *fc)  in setup_bdev_super()  argument
1611 		if (fc)  in setup_bdev_super()
1612 			errorf(fc, "%s: Can't open blockdev", fc->source);  in setup_bdev_super()
1632 		if (fc)  in setup_bdev_super()
1633 			warnf(fc, "%pg: Can't mount, blockdev is frozen", bdev);  in setup_bdev_super()
1655  * @fc: The filesystem context holding the parameters
1659 int get_tree_bdev_flags(struct fs_context *fc,  in get_tree_bdev_flags()  argument
1661 				  struct fs_context *fc), unsigned int flags)  in get_tree_bdev_flags()  argument
1667 	if (!fc->source)  in get_tree_bdev_flags()
1668 		return invalf(fc, "No source specified");  in get_tree_bdev_flags()
1670 	error = lookup_bdev(fc->source, &dev);  in get_tree_bdev_flags()
1673 			errorf(fc, "%s: Can't lookup blockdev", fc->source);  in get_tree_bdev_flags()
1676 	fc->sb_flags |= SB_NOSEC;  in get_tree_bdev_flags()
1677 	s = sget_dev(fc, dev);  in get_tree_bdev_flags()
1683 		if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {  in get_tree_bdev_flags()
1684 			warnf(fc, "%pg: Can't mount, would change RO state", s->s_bdev);  in get_tree_bdev_flags()
1689 		error = setup_bdev_super(s, fc->sb_flags, fc);  in get_tree_bdev_flags()
1691 			error = fill_super(s, fc);  in get_tree_bdev_flags()
1699 	BUG_ON(fc->root);  in get_tree_bdev_flags()
1700 	fc->root = dget(s->s_root);  in get_tree_bdev_flags()
1707  * @fc: The filesystem context holding the parameters
1710 int get_tree_bdev(struct fs_context *fc,  in get_tree_bdev()  argument
1714 	return get_tree_bdev_flags(fc, fill_super, 0);  in get_tree_bdev()
1734  * @fc: The superblock configuration context.
1738  * used for mounting in @fc->root.
1740 int vfs_get_tree(struct fs_context *fc)  in vfs_get_tree()  argument
1745 	if (fc->root)  in vfs_get_tree()
1748 	/* Get the mountable root in fc->root, with a ref on the root and a ref  in vfs_get_tree()
1751 	error = fc->ops->get_tree(fc);  in vfs_get_tree()
1755 	if (!fc->root) {  in vfs_get_tree()
1756 		pr_err("Filesystem %s get_tree() didn't set fc->root, returned %i\n",  in vfs_get_tree()
1757 		       fc->fs_type->name, error);  in vfs_get_tree()
1764 	sb = fc->root->d_sb;  in vfs_get_tree()
1776 	error = security_sb_set_mnt_opts(sb, fc->security, 0, NULL);  in vfs_get_tree()
1778 		fc_drop_locked(fc);  in vfs_get_tree()
1789 		"negative value (%lld)\n", fc->fs_type->name, sb->s_maxbytes);  in vfs_get_tree()