From: Darrick J. Wong <djwong@xxxxxxxxxx> The btree bulkloading code calls xfs_buf_delwri_queue_here when it has finished formatting a new btree block and wants to queue it to be written to disk. Once the new btree root has been committed, the blocks (and hence the buffers) will be accessible to the rest of the filesystem. Mark each new buffer as DONE when adding it to the delwri list so that the next btree traversal can skip reloading the contents from disk. Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx> --- fs/xfs/xfs_buf.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index ec4bd7a24d88c..702b3a1f9d1c4 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -2152,6 +2152,14 @@ xfs_buf_delwri_queue_here( ASSERT(!(bp->b_flags & _XBF_DELWRI_Q)); + /* + * The buffer is locked. The _delwri_queue below will bhold the buffer + * so it cannot be reclaimed until the blocks are written to disk. + * Mark this buffer XBF_DONE (i.e. uptodate) so that a subsequent + * xfs_buf_read will not pointlessly reread the contents from the disk. + */ + bp->b_flags |= XBF_DONE; + xfs_buf_delwri_queue(bp, buffer_list); }
