git: hammer2(8): hash inode numbers and media offsets together

[Aaron LI]

commit 62d1f0c2a44dfc952d36348e512629f68bb14ab9
Author: David Bidner <david at crap.solutions>
Date:   Mon Oct 5 08:48:45 2026 +0200

    hammer2(8): hash inode numbers and media offsets together
    
    The recovery secondary hash XORs inode numbers with shifted media
    offsets. The two values are correlated, so the XOR often cancels and
    puts many entries in one bucket.  This is a real concern because the
    recovery is basically a block scan on a copy-on-write filesystem, so
    there can be *many* copies of the same inode in the scan.
    
    Hash the two complete values with the existing HAMMER2 XXH64 and share
    the helper between both inode insertion paths.
    
    Reported-by: tkusumi
    Reviewed-by: dillon
    Bug: https://bugs.dragonflybsd.org/issues/3378

Summary of changes:
 sbin/hammer2/cmd_recover.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/62d1f0c2a44dfc952d36348e512629f68bb14ab9


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