This patchset is for a new library that programs can use to determine if a device belongs to multipath. The primary user that this is intended for is SID, the Storage Instantiation Daemon https://github.com/sid-project Right now, this doesn't change our existing code to determine path ownership, and it doesn't do the exact same steps, although it is very close. In the future, it would be possible to pull most of this code entirely into libmultipath, except for some wrappers, and use it for both methods. Obviously, this still needs man pages, and there are some helper functions for things like controlling multipath's logging that are missing, but I want to see if anyone has strong feelings about what this looks like. I also have two more changes that I want to make to the multipath code, to make path validation do less unnecessary work, which aren't in this patchset. 1. I want to remove the lock file from the failed wwids code. I don't see how it actually stops any races, and it means that simply reading a file, can trigger delays and writes (albeit to a memory base fs). 2. I want to deprecate getuid_callout. Once this is gone, you will be able to call pathinfo and get a path's WWID, without ever needing to open the path. Benjamin Marzinski (3): libmultipath: make libmp_dm_init optional libmultipath: make sysfs_is_multipathed able to return wwid multipath: add libmpathvalid library Makefile | 1 + Makefile.inc | 1 + libmpathvalid/Makefile | 38 +++++++ libmpathvalid/libmpathvalid.version | 6 + libmpathvalid/mpath_valid.c | 171 ++++++++++++++++++++++++++++ libmpathvalid/mpath_valid.h | 53 +++++++++ libmultipath/Makefile | 1 + libmultipath/devmapper.c | 66 ++++++++++- libmultipath/devmapper.h | 4 +- libmultipath/sysfs.c | 22 +++- libmultipath/sysfs.h | 2 +- multipath/main.c | 7 +- 12 files changed, 360 insertions(+), 12 deletions(-) create mode 100644 libmpathvalid/Makefile create mode 100644 libmpathvalid/libmpathvalid.version create mode 100644 libmpathvalid/mpath_valid.c create mode 100644 libmpathvalid/mpath_valid.h -- 2.17.2 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
