git: sys/vfs/hammer: Add error messages for crc test failure

[Tomohiro Kusumi]

commit babd2e48fa1809dd684239b1113915cd37c044f8
Author: Tomohiro Kusumi <kusumi.tomohiro at gmail.com>
Date:   Sat Sep 26 02:04:37 2015 +0900

    sys/vfs/hammer: Add error messages for crc test failure
    
    Add crc error messages based on the existing error message
    in hammer_btree_extract(). The one in hammer_mirror.c is
    a part of #if0'd function.
    
    Reported-by: profmakx
    Suggested-by: dillon
    
    23:27 (tkusumi) too many error = EIO;  but possibly bad crc ?
    23:28 (tkusumi) if bad crc is the case turning on hammer_debug_critical leads to Debugger("CRC FAILED: B-TREE NODE");
    23:40 (dillon) it's likely a CRC failure, though I think it should print those out on the console too
    23:54 (tkusumi) some bad crc are missing  "CRC DATA @ %016llx/%d FAILED\n"
    23:59 (dillon) those could be added for clarity.  Almost universally EIO from hammer means a bad CRC and not an actual disk read error.
    23:59 (dillon) USB-connected hard drives seem to get these.  I've never gotten a bad CRC from a SATA-connected HDD via the AHCI driver.

Summary of changes:
 sys/vfs/hammer/hammer_mirror.c | 4 +++-
 sys/vfs/hammer/hammer_object.c | 4 +++-
 sys/vfs/hammer/hammer_ondisk.c | 3 +++
 3 files changed, 9 insertions(+), 2 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/babd2e48fa1809dd684239b1113915cd37c044f8


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