[libvirt] [PATCH RFC 00/22] Support for walking backing chains on remote volumes (especially gluster)

This series adds support for waliking (detecting) of backing chain on remote storage and implements the needed callbacks for the gluster storage system via native library. The last patch in the series mocks up path canonicalization on gluster as I'm working on that but this series is getting tedious to rebase and handle so I'd like to start reviews. Peter Krempa (22): qemu: Make qemuDomainPrepareDiskChainElement aware of remote storage storage: Store gluster volume name separately storage: Rework debugging of storage file access through storage driver conf: Fix domain disk path iterator to work with networked storage storage: Add NONE protocol type for network disks storage: Add support for access to files using provided uid/gid storage: Add storage file API to read file headers storage: backend: Add unique id retrieval API storage: Add API to check accessibility of storage volumes storage: Move virStorageFileGetMetadata to the storage driver storage: Determine the local storage type right away test: storage: Initialize storage source to correct type storage: backend: Add possibility to suppress errors from backend lookup storage: Switch metadata crawler to use storage driver to get unique path storage: Switch metadata crawler to use storage driver to read headers storage: Switch metadata crawler to use storage driver file access check storage: Add infrastructure to parse remote network backing names storage: Change to new backing store parser storage: Traverse backing chains of network disks qemu: Add support for networked disks for block pull/block rebase qemu: Add support for networked disks for block commit [DO NOT APPLY UPSTREAM] storage: gluster: mock up path canonicalization cfg.mk | 2 +- src/Makefile.am | 2 + src/conf/domain_conf.c | 70 +++- src/libvirt_private.syms | 3 +- src/qemu/qemu_command.c | 21 +- src/qemu/qemu_domain.c | 10 +- src/qemu/qemu_driver.c | 116 +++++-- src/security/virt-aa-helper.c | 2 + src/storage/storage_backend.c | 16 +- src/storage/storage_backend.h | 22 +- src/storage/storage_backend_fs.c | 127 +++++++- src/storage/storage_backend_gluster.c | 141 ++++++-- src/storage/storage_driver.c | 329 ++++++++++++++++++- src/storage/storage_driver.h | 15 +- src/util/virstoragefile.c | 596 +++++++++++++++++++++------------- src/util/virstoragefile.h | 16 +- tests/Makefile.am | 7 +- tests/virstoragetest.c | 26 +- 18 files changed, 1162 insertions(+), 359 deletions(-) -- 1.9.2