lkml.org 
[lkml]   [2018]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.14 136/167] Btrfs: fix extent state leak from tree log
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

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

    From: Liu Bo <bo.li.liu@oracle.com>

    commit 55237a5f2431a72435e3ed39e4306e973c0446b7 upstream.

    It's possible that btrfs_sync_log() bails out after one of the two
    btrfs_write_marked_extents() which convert extent state's state bit into
    EXTENT_NEED_WAIT from EXTENT_DIRTY/EXTENT_NEW, however only EXTENT_DIRTY
    and EXTENT_NEW are searched by free_log_tree() so that those extent states
    with EXTENT_NEED_WAIT lead to memory leak.

    cc: <stable@vger.kernel.org>
    Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
    Reviewed-by: Josef Bacik <jbacik@fb.com>
    Signed-off-by: David Sterba <dsterba@suse.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/btrfs/tree-log.c | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    --- a/fs/btrfs/tree-log.c
    +++ b/fs/btrfs/tree-log.c
    @@ -3047,13 +3047,14 @@ static void free_log_tree(struct btrfs_t

    while (1) {
    ret = find_first_extent_bit(&log->dirty_log_pages,
    - 0, &start, &end, EXTENT_DIRTY | EXTENT_NEW,
    + 0, &start, &end,
    + EXTENT_DIRTY | EXTENT_NEW | EXTENT_NEED_WAIT,
    NULL);
    if (ret)
    break;

    clear_extent_bits(&log->dirty_log_pages, start, end,
    - EXTENT_DIRTY | EXTENT_NEW);
    + EXTENT_DIRTY | EXTENT_NEW | EXTENT_NEED_WAIT);
    }

    /*

    \
     
     \ /
      Last update: 2018-02-21 14:59    [W:5.614 / U:0.028 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site