1. 26 Mar, 2013 1 commit
    • Chris Mason's avatar
      Btrfs: fix race between mmap writes and compression · 4adaa611
      Chris Mason authored
      Btrfs uses page_mkwrite to ensure stable pages during
      crc calculations and mmap workloads.  We call clear_page_dirty_for_io
      before we do any crcs, and this forces any application with the file
      mapped to wait for the crc to finish before it is allowed to change
      the file.
      
      With compression on, the clear_page_dirty_for_io step is happening after
      we've compressed the pages.  This means the applications might be
      changing the pages while we are compressing them, and some of those
      modifications might not hit the disk.
      
      This commit adds the clear_page_dirty_for_io before compression starts
      and makes sure to redirty the page if we have to fallback to
      uncompressed IO as well.
      Signed-off-by: default avatarChris Mason <chris.mason@fusionio.com>
      Reported-by: default avatarAlexandre Oliva <oliva@gnu.org>
      cc: stable@vger.kernel.org
      4adaa611
  2. 21 Mar, 2013 5 commits
  3. 16 Mar, 2013 1 commit
    • Liu Bo's avatar
      Btrfs: fix warning of free_extent_map · 3b277594
      Liu Bo authored
      Users report that an extent map's list is still linked when it's actually
      going to be freed from cache.
      
      The story is that
      
      a) when we're going to drop an extent map and may split this large one into
      smaller ems, and if this large one is flagged as EXTENT_FLAG_LOGGING which means
      that it's on the list to be logged, then the smaller ems split from it will also
      be flagged as EXTENT_FLAG_LOGGING, and this is _not_ expected.
      
      b) we'll keep ems from unlinking the list and freeing when they are flagged with
      EXTENT_FLAG_LOGGING, because the log code holds one reference.
      
      The end result is the warning, but the truth is that we set the flag
      EXTENT_FLAG_LOGGING only during fsync.
      
      So clear flag EXTENT_FLAG_LOGGING for extent maps split from a large one.
      Reported-by: default avatarJohannes Hirte <johannes.hirte@fem.tu-ilmenau.de>
      Reported-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Signed-off-by: default avatarChris Mason <chris.mason@fusionio.com>
      3b277594
  4. 14 Mar, 2013 6 commits
  5. 07 Mar, 2013 3 commits
  6. 05 Mar, 2013 1 commit
  7. 04 Mar, 2013 10 commits
  8. 03 Mar, 2013 1 commit
  9. 01 Mar, 2013 8 commits
  10. 28 Feb, 2013 4 commits