If you say Y here, you will be able to set per user limits for disk usage (also called disk quotas). Currently, it works for the ext2, ext3, and reiserfs file system. ext3 also supports journalled quotas for which you don't need to run quotacheck(8) after an unclean shutdown. For further details, read the Quota mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>, or the documentation provided with the quota tools. Probably the quota support is only useful for multi user systems. If unsure, say N.
If you say Y here, quota warnings (about exceeding softlimit, reaching hardlimit, etc.) will be reported through netlink interface. If unsure, say Y.
If you say Y here, quota warnings (about exceeding softlimit, reaching hardlimit, etc.) will be printed to the process' controlling terminal. Note that this behavior is currently deprecated and may go away in future. Please use notification via netlink socket instead.
If you say Y here, quota subsystem will perform some additional sanity checks of quota internal structures. If unsure, say N.
This quota format was (is) used by kernels earlier than 2.4.22. If you have quota working and you don't want to convert to new quota format say Y here.
This config option enables kernel support for vfsv0 and vfsv1 quota formats. Both these formats support 32-bit UIDs/GIDs and vfsv1 format also supports 64-bit inode and block quota limits. If you need this functionality say Y here.