[PATCH 00/21] xfs: metadata CRCs, third version

Dave Chinner
2013-03-12T12:31:02Z

Hi Folks,

Another week, another version. Previous versions:

http://oss.sgi.com/archives/xfs/2013-01/msg00328.html
http://oss.sgi.com/archives/xfs/2013-02/msg00451.html

This version is based on 3.9-rc2 + TOT xfsdev. I've just forward
ported it from a 3.8.0 base where I've been working on it and
testing for some time. Bugs that show up are likely to be a result
of the forward porting, because I'm posting this before I've even
run a full test cycle on 3.9-rc2. I'll probably send delta patches
as followup bug fixes rather than reposting full patches, I think...

The first patch is an outstanding bug fix, the second is a change in
corruption event output to make it output the entire headers of the
corrupted buffer to make it easier to triage problems.

This new version contains:
- numerous bug fixes, mostly in the directory and
attribute code.
- support for remote attributes
- directory/attribute buffer type tracking for log recovery
- some cleanup of rough corners in the dir/attr code.

Still to do:

- DT_* type fields in the directory entries
- storage of attributes larger than 256 bytes in shortform
attribute forks.
- extended superblock feature field checking (i.e. reject
anything that is not zero)
- add mount warnings about CRC support being experimental
- Documentation (half written, not in series)

In terms of testing, this patch set seems quite robust running on
non-CRC enabled filesystems with existing tool chains. There are no
regressions from xfstests, fsmark, dbench and other worklaods I've
thrown at it, nor does there appear to be any significant
performance impact from the modified code.

The CRC enabled code has been smoke tested. I haven't finished the
userspace port so there is no repair/check functionality which means
I cannot run xfstests on it yet. The attribute code is pretty much
untested, but everything else seems to work fine. I can run it
through my 50-million inode fsmark test (which creates, walks and
removes 50 million inodes) without any problems occurring, so
directory growing and shrinking is not obviously broken like it was
last time.

To run with CRCs enabled, however, you need a mkfs.xfs patch to
change the offsets of entries in short form directories. I'l post an
updated patch set in the morning that at least enables this in
userspace.

Comments, flames and questions welcome.

-Dave.

$ git diff --stat -C -M --summary 929724d..
fs/xfs/Makefile | 6 +-
fs/xfs/xfs_ag.h | 56 +-
fs/xfs/xfs_alloc.c | 199 ++++--
fs/xfs/xfs_alloc_btree.c | 105 ++-
fs/xfs/xfs_alloc_btree.h | 12 +-
fs/xfs/xfs_attr.c | 456 +++---------
fs/xfs/xfs_attr.h | 1 -
fs/xfs/xfs_attr_leaf.c | 1780 +++++++++++++++++++++++++++--------------------
fs/xfs/xfs_attr_leaf.h | 122 +++-
fs/xfs/xfs_attr_remote.c | 550 +++++++++++++++
fs/xfs/xfs_attr_remote.h | 46 ++
fs/xfs/xfs_bmap.c | 71 +-
fs/xfs/xfs_bmap_btree.c | 110 ++-
fs/xfs/xfs_bmap_btree.h | 19 +-
fs/xfs/xfs_btree.c | 256 +++++--
fs/xfs/xfs_btree.h | 64 +-
fs/xfs/xfs_buf.c | 6 +
fs/xfs/xfs_buf_item.h | 52 +-
fs/xfs/xfs_da_btree.c | 1500 ++++++++++++++++++++++++---------------
fs/xfs/xfs_da_btree.h | 130 +++-
fs/xfs/xfs_dinode.h | 43 +-
fs/xfs/xfs_dir2_block.c | 179 +++--
fs/xfs/xfs_dir2_data.c | 266 ++++---
fs/xfs/xfs_dir2_format.h | 290 +++++++-
fs/xfs/xfs_dir2_leaf.c | 891 +++++++++++++++---------
fs/xfs/xfs_dir2_node.c | 992 ++++++++++++++++----------
fs/xfs/xfs_dir2_priv.h | 50 +-
fs/xfs/xfs_dir2_sf.c | 12 +-
fs/xfs/xfs_dquot.c | 112 ++-
fs/xfs/xfs_error.c | 2 +-
fs/xfs/xfs_file.c | 2 +-
fs/xfs/xfs_fsops.c | 34 +-
fs/xfs/xfs_ialloc.c | 80 ++-
fs/xfs/xfs_ialloc_btree.c | 87 ++-
fs/xfs/xfs_ialloc_btree.h | 9 +-
fs/xfs/xfs_inode.c | 212 ++++--
fs/xfs/xfs_inode.h | 31 +-
fs/xfs/xfs_inode_item.c | 2 +-
fs/xfs/xfs_log_recover.c | 219 +++++-
fs/xfs/xfs_mount.c | 97 ++-
fs/xfs/xfs_mount.h | 1 +
fs/xfs/xfs_qm.c | 23 +-
fs/xfs/xfs_qm.h | 2 +
fs/xfs/xfs_quota.h | 11 +-
fs/xfs/xfs_sb.h | 100 ++-
fs/xfs/xfs_symlink.c | 719 +++++++++++++++++++
fs/xfs/xfs_symlink.h | 53 ++
fs/xfs/xfs_trace.c | 2 +-
fs/xfs/xfs_trans.h | 4 +
fs/xfs/xfs_trans_buf.c | 51 +-
fs/xfs/xfs_vnodeops.c | 480 +------------
51 files changed, 7034 insertions(+), 3563 deletions(-)
create mode 100644 fs/xfs/xfs_attr_remote.c
create mode 100644 fs/xfs/xfs_attr_remote.h
create mode 100644 fs/xfs/xfs_symlink.c
create mode 100644 fs/xfs/xfs_symlink.h