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When a command is flagged with NO_METADATA_PROCESSING flag, it means such command does not process any metadata and hence it doens't require lvmetad, lvmpolld and it can get away with no locking too. These are mostly simple commands (like lvmconfig/dumpconfig, version, types, segtypes and other builtin commands that do not process metadata in any way). At first, when lvm command is executed, create toolcontext without initializing connections (lvmetad,lvmpolld) and without initializing filters (which depend on connections init). Instead, delay this initialization until we know we need this. That is, until the lvm_run_command fn is called in which we know what the actual command to run is and hence we can avoid any connection, filter or locking initiliazation for commands that would not make use of it anyway. For all the other create_toolcontext calls, we keep the original behaviour - the filters and connections are initialized together with the toolcontext.
This tree contains the LVM2 and device-mapper tools and libraries. For more information about LVM2 read the changelog in the WHATS_NEW file. Installation instructions are in INSTALL. There is no warranty - see COPYING and COPYING.LIB. Tarballs are available from: ftp://sources.redhat.com/pub/lvm2/ The source code is stored in git: http://git.fedorahosted.org/git/lvm2.git git clone git://git.fedorahosted.org/git/lvm2.git Mailing list for general discussion related to LVM2: linux-lvm@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/linux-lvm Mailing lists for LVM2 development, patches and commits: lvm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/lvm-devel lvm2-commits@lists.fedorahosted.org (Read-only archive of commits) Subscribe from https://fedorahosted.org/mailman/listinfo/lvm2-commits Mailing list for device-mapper development, including kernel patches and multipath-tools: dm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/dm-devel The source code repository used until 7th June 2012 is accessible here: http://sources.redhat.com/cgi-bin/cvsweb.cgi/LVM2/?cvsroot=lvm2.