git: sys/vfs/hammer: Make hammer_delete_at_cursor() properly set *stat_bytes

[Tomohiro Kusumi]

commit 03b6feead81b307f2f2e39220e169e7d7226c400
Author: Tomohiro Kusumi <kusumi.tomohiro at gmail.com>
Date:   Sun Apr 26 03:55:01 2015 +0900

    sys/vfs/hammer: Make hammer_delete_at_cursor() properly set *stat_bytes
    
    - This commit makes hammer_delete_at_cursor() set *stat_bytes arg.
      *stat_bytes has been ignored although it was supposed to set bytes
      physically deleted from the btree.
    
    - hammer prune command expects this function to set above bytes and
      print it after pruning, however it's always 0 because the function
      ignores it.
    
    - Note that the actual size freed from zone address space may differ
      from *stat_bytes (or what the hammer prune command shows), because
      hammer_blockmap_free() may round it up with its alignment size.
    
      ==========
      example1 - with existing hammer
      # hammer prune ./test
      TID 000000010404e750 - 0000000104071090
      TID 0000000104034060 - 000000010404e750
      TID 0000000104019cb0 - 0000000104034060
      TID 0000000000000001 - 0000000104019cb0
      Prune /HAMMER/: 4 snapshots
      Prune /HAMMER/: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 0
      Prune /HAMMER/: prune_min is 0d/00:00:00
      Prune /HAMMER/ succeeded
      Pruned 51/769595 records (10 directory entries) and 0 bytes
    
      example2 - with this commit
      # hammer prune ./test
      TID 000000010404ea10 - 0000000104071390
      TID 0000000104034360 - 000000010404ea10
      TID 0000000104019fb0 - 0000000104034360
      TID 0000000000000001 - 0000000104019fb0
      Prune /HAMMER/: 4 snapshots
      Prune /HAMMER/: objspace 8000000000000000:0000 7fffffffffffffff:ffff pfs_id 0
      Prune /HAMMER/: prune_min is 0d/00:00:00
      Prune /HAMMER/ succeeded
      Pruned 51/769596 records (11 directory entries) and 6710 bytes

Summary of changes:
 sys/vfs/hammer/hammer.h        |  2 +-
 sys/vfs/hammer/hammer_btree.c  | 19 ++++++++++++++-----
 sys/vfs/hammer/hammer_object.c | 12 +++++++++++-
 sys/vfs/hammer/hammer_prune.c  |  4 +++-
 4 files changed, 29 insertions(+), 8 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/03b6feead81b307f2f2e39220e169e7d7226c400


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