[XFS updates] XFS development tree branch, master, updated. v3.7-rc1-72-g0e446be

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  0e446be xfs: add CRC checks to the log
  bc02e86 xfs: add CRC infrastructure
      from  1813dd64057490e7a0678a885c4fe6d02f78bdc1 (commit)

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- Log -----------------------------------------------------------------
commit 0e446be44806240c779666591bb9e8cb0e86a50d
Author: Christoph Hellwig <hch at lst.de>
Date:   Mon Nov 12 22:54:24 2012 +1100

    xfs: add CRC checks to the log
    
    Implement CRCs for the log buffers.  We re-use a field in
    struct xlog_rec_header that was used for a weak checksum of the
    log buffer payload in debug builds before.
    
    The new checksumming uses the crc32c checksum we will use elsewhere
    in XFS, and also protects the record header and addition cycle data.
    
    Due to this there are some interesting changes in xlog_sync, as we
    need to do the cycle wrapping for the split buffer case much earlier,
    as we would touch the buffer after generating the checksum otherwise.
    
    The CRC calculation is always enabled, even for non-CRC filesystems,
    as adding this CRC does not change the log format. On non-CRC
    filesystems, only issue an alert if a CRC mismatch is found and
    allow recovery to continue - this will act as an indicator that
    log recovery problems are a result of log corruption. On CRC enabled
    filesystems, however, log recovery will fail.
    
    Note that existing debug kernels will write a simple checksum value
    to the log, so the first time this is run on a filesystem taht was
    last used on a debug kernel it will through CRC mismatch warning
    errors. These can be ignored.
    
    Initially based on a patch from Dave Chinner, then modified
    significantly by Christoph Hellwig.  Modified again by Dave Chinner
    to get to this version.
    
    Signed-off-by: Christoph Hellwig <hch at lst.de>
    Signed-off-by: Dave Chinner <dchinner at redhat.com>
    Reviewed-by: Mark Tinguely <tinguely at sgi.com>
    Signed-off-by: Ben Myers <bpm at sgi.com>

commit bc02e8693d875c2a9b0037cfd37fe0b726d26403
Author: Christoph Hellwig <hch at lst.de>
Date:   Fri Nov 16 09:20:37 2012 +1100

    xfs: add CRC infrastructure
    
     - add a mount feature bit for CRC enabled filesystems
     - add some helpers for generating and verifying the CRCs
     - add a copy_uuid helper
    
    The checksumming helpers are loosely based on similar ones in sctp,
    all other bits come from Dave Chinner.
    
    Signed-off-by: Christoph Hellwig <hch at lst.de>
    Signed-off-by: Dave Chinner <dchinner at redhat.com>
    Reviewed-by: Mark Tinguely <tinguely at sgi.com>
    Signed-off-by: Ben Myers <bpm at sgi.com>

-----------------------------------------------------------------------

Summary of changes:
 fs/xfs/Kconfig           |    1 +
 fs/xfs/uuid.h            |    6 +++
 fs/xfs/xfs_cksum.h       |   63 ++++++++++++++++++++++
 fs/xfs/xfs_linux.h       |    1 +
 fs/xfs/xfs_log.c         |  132 ++++++++++++++++++++++++++++++++++++++--------
 fs/xfs/xfs_log_priv.h    |   11 ++--
 fs/xfs/xfs_log_recover.c |  132 ++++++++++++++++++++++------------------------
 fs/xfs/xfs_sb.h          |    7 +++
 8 files changed, 254 insertions(+), 99 deletions(-)
 create mode 100644 fs/xfs/xfs_cksum.h


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