[PATCH 6/8] xfs: remove all the inodes on a buffer from the AIL in bulk

[Christoph Hellwig]

While the patch looks good for the ail lock contetion removal, I don't
quite like the model with the double iteration over the log item list
on the buffer.  What do you think about the following plan:

 (1) merge xfs_istale_done into xfs_iflush_done by checking for
     XFS_ISTALE
 (2) convert not only the inode log item completion to your new scheme,
     but also the dquots
 (3) replace xfs_buf_do_callbacks with a callback in the buffer, which
     now points to the inode and dqout routines, or calls the completion
     for the only items in "normal" buf items.