xfsprogs: Initial CRC support

Hi Folks,

This is the first real "works ok" CRC patchset for xfsprogs. It provides full support for mkfs.xfs and xfs_repair, and partial read-only support for xfs_db.

For mkfs.xfs, it does everything properly, and filesystems that are freshly made also run cleanly through xfs_repair and mount and run just fine.

For xfs_repair, it reads and writes all metadata with CRC checks, calculations and validation just like the kernel code does, but it currently silently ignores the validation done in the IO layer. Enabling that is future work - it involves adding buffer error checking to every libxfs_readbuf() call that is made, and we do none of that right now. It does, however, fully validate all the non-CRC format metadata just as it does for non-CRC filesystems, and so the coverage it has is the same for both CRC and non-CRC filesystems.

For xfs_db, there is read-only support for looking at the filesystem as the xfs_db IO stack does not support CRCs at all. We need to convert xfs_db to use the libxfs infrastructure to enable that. Apart from that, xfs_db has partial support for the extended metadata fields - the directory/attribute blocks don't have extended support yet, but everything else does.

xfs_check is made special. It currently detects a version 5 superblock, and immediately exits with success. Hence it always says CRC enabled filesystems are OK. This is a temporary change that enables running xfstests without full support in xfs_db for all the new metadata structures (like headers in remote symlink and attribute blocks). Depending on if we want to keep xfs-check useful for xfstests, we can revisit this bypass hack once xfs_db has been converted to use the libxfs IO engine.

Overall, xfstests is now running enough to start to find bugs in the kernel CRC code - I'm mainly hitting remote attribute block bugs right now (generic/117!) but there's certainly less problems being reported than I expected.

Oh, and I've tested it with external log devices and real time devices, too.

Comments, thoughts, flames, and testing all welcome!

Cheers,

Dave.

$ git diff --minimal --stat --summary 8e78288..
 copy/xfs_copy.c            |    4 +-
 db/agf.c                   |    3 +
 db/agfl.c                  |   16 +
 db/agfl.h                  |    2 +
 db/agi.c                   |    3 +
 db/attr.c                  |   20 +-
 db/btblock.c               |  145 +++++
 db/btblock.h               |   10 +
 db/check.c                 |   34 +-
 db/dir2.c                  |   10 +-
 db/dir2sf.c                |    9 +-
 db/field.c                 |   16 +
 db/field.h                 |    8 +
 db/freesp.c                |   13 +-
 db/init.c                  |   19 +
 db/inode.c                 |   27 +
 db/inode.h                 |    3 +
 db/metadump.c              |    4 +-
 db/sb.c                    |   54 +-
 db/type.c                  |   34 +-
 db/type.h                  |    3 +-
 include/Makefile           |    4 +-
 include/libxfs.h           |  118 ++--
 include/libxlog.h          |    2 +-
 include/xfs_ag.h           |   54 +-
 include/xfs_alloc_btree.h  |   13 +-
 include/xfs_attr_leaf.h    |  124 +++-
 include/xfs_attr_remote.h  |   52 ++
 include/xfs_bmap_btree.h   |   20 +-
 include/xfs_btree.h        |   63 +-
 include/xfs_buf_item.h     |   64 +-
 include/xfs_da_btree.h     |  130 +++-
 include/xfs_dinode.h       |   37 +-
 include/xfs_dir2.h         |    7 +
 include/xfs_dir2_format.h  |  293 ++++++++-
 include/xfs_ialloc_btree.h |   10 +-
 include/xfs_inode.h        |   26 +
 include/xfs_mount.h        |    1 +
 include/xfs_quota.h        |   11 +-
 include/xfs_sb.h           |  166 ++++-
 include/xfs_symlink.h      |   45 ++
 libxfs/Makefile            |    4 +-
 libxfs/init.c              |   84 ++-
 libxfs/logitem.c           |    4 +-
 libxfs/rdwr.c              |  236 ++++---
 libxfs/trans.c             |   17 +-
 libxfs/util.c              |   29 +-
 libxfs/xfs.h               |   37 +-
 libxfs/xfs_alloc.c         |  202 ++++--
 libxfs/xfs_alloc_btree.c   |   99 ++-
 libxfs/xfs_attr.c          |  386 ++----------
 libxfs/xfs_attr_leaf.c     | 1553 ++++++++++++++++++++++++++--------------------
 libxfs/xfs_attr_remote.c   |  527 ++++++++++++++++
 libxfs/xfs_bmap.c          |   49 +-
 libxfs/xfs_bmap_btree.c    |  107 +++-
 libxfs/xfs_btree.c         |  255 ++++++--
 libxfs/xfs_da_btree.c      | 1499 +++++++++++++++++++++++++++-----------------
 libxfs/xfs_dir2_block.c    |  171 +++--
 libxfs/xfs_dir2_data.c     |  266 +++++---
 libxfs/xfs_dir2_leaf.c     |  880 ++++++++++++++++----------
 libxfs/xfs_dir2_node.c     | 1007 +++++++++++++++++++-----------
 libxfs/xfs_dir2_priv.h     |   46 +-
 libxfs/xfs_dir2_sf.c       |    8 +-
 libxfs/xfs_ialloc.c        |   78 ++-
 libxfs/xfs_ialloc_btree.c  |   80 ++-
 libxfs/xfs_inode.c         |  124 +++-
 libxfs/xfs_mount.c         |  137 +++-
 libxfs/xfs_symlink.c       |  154 +++++
 logprint/log_misc.c        |   51 +-
 logprint/log_print_all.c   |    3 +-
 logprint/log_print_trans.c |   18 +
 logprint/logprint.c        |    4 +-
 mdrestore/Makefile         |    2 +-
 mkfs/maxtrres.c            |    4 +-
 mkfs/proto.c               |    6 +-
 mkfs/xfs_mkfs.c            |  170 +++--
 mkfs/xfs_mkfs.h            |   12 +-
 repair/agheader.c          |   36 +-
 repair/attr_repair.c       |  173 +++---
 repair/dino_chunks.c       |   13 +-
 repair/dinode.c            |  200 +++---
 repair/dir2.c              |  167 ++---
 repair/dir2.h              |    6 +-
 repair/phase2.c            |    8 +-
 repair/phase3.c            |    2 +-
 repair/phase5.c            |  156 +++--
 repair/phase6.c            |  172 +++--
 repair/prefetch.c          |    9 +-
 repair/rt.c                |    4 +-
 repair/scan.c              |  169 ++---
 repair/scan.h              |   12 +-
 repair/versions.c          |    2 +-
 repair/xfs_repair.c        |    8 +-
 93 files changed, 7559 insertions(+), 3564 deletions(-)
 create mode 100644 include/xfs_attr_remote.h
 create mode 100644 include/xfs_symlink.h
 create mode 100644 libxfs/xfs_attr_remote.c
 create mode 100644 libxfs/xfs_symlink.c

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