xfs: xfs_iflush_done checks the wrong log item callback
Commit 30136832 ("xfs: remove all the inodes on a buffer from the AIL in bulk") made the xfs inode flush callback more efficient by combining all the inode writes on the buffer and the deletions of the inode log item from AIL. The initial loop in this patch should be looping through all the log items on the buffer to see which items have xfs_iflush_done as their callback function. But currently, only the log item passed to the function has its callback compared to xfs_iflush_done. If the log item pointer passed to the function does have the xfs_iflush_done callback function, then all the log items on the buffer are removed from the li_bio_list on the buffer b_fspriv and could be removed from the AIL even though they may have not been written yet. This problem is masked by the fact that currently all inodes on a buffer will have the same calback function - either xfs_iflush_done or xfs_istale_done - and hence the bug cannot manifest in any way. Still, we need to remove the landmine so that if we add new callbacks in future this doesn't cause us problems. Signed-off-by: NMark Tinguely <tinguely@sgi.com> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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