• Steven Whitehouse's avatar
    GFS2: Use ->writepages for ordered writes · 45138990
    Steven Whitehouse authored
    Instead of using a list of buffers to write ahead of the journal
    flush, this now uses a list of inodes and calls ->writepages
    via filemap_fdatawrite() in order to achieve the same thing. For
    most use cases this results in a shorter ordered write list,
    as well as much larger i/os being issued.
    
    The ordered write list is sorted by inode number before writing
    in order to retain the disk block ordering between inodes as
    per the previous code.
    
    The previous ordered write code used to conflict in its assumptions
    about how to write out the disk blocks with mpage_writepages()
    so that with this updated version we can also use mpage_writepages()
    for GFS2's ordered write, writepages implementation. So we will
    also send larger i/os from writeback too.
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
    45138990
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