• Steven Whitehouse's avatar
    GFS2: Clean up journal extent mapping · b50f227b
    Steven Whitehouse authored
    This patch fixes a long standing issue in mapping the journal
    extents. Most journals will consist of only a single extent,
    and although the cache took account of that by merging extents,
    it did not actually map large extents, but instead was doing a
    block by block mapping. Since the journal was only being mapped
    on mount, this was not normally noticeable.
    
    With the updated code, it is now possible to use the same extent
    mapping system during journal recovery (which will be added in a
    later patch). This will allow checking of the integrity of the
    journal before any reply of the journal content is attempted. For
    this reason the code is moving to bmap.c, since it will be used
    more widely in due course.
    
    An exercise left for the reader is to compare the new function
    gfs2_map_journal_extents() with gfs2_write_alloc_required()
    
    Additionally, should there be a failure, the error reporting is
    also updated to show more detail about what went wrong.
    Signed-off-by: Steven Whitehouse's avatarSteven Whitehouse <swhiteho@redhat.com>
    b50f227b
bmap.h 1.97 KB