On Sat, Oct 15, 2016 at 10:52:32AM +0200, Christoph Hellwig wrote:
> Rewrite xfs_reflink_cancel_cow_blocks so that we only do a search for
> the first extent in the extent list and then iterate over the remaining
> extents using the extent index, passing the extent we operate on
> directly to xfs_bmap_del_extent_delay or xfs_bmap_del_extent_cow instead
> of going through xfs_bunmapi and doing yet another extent list lookup.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
> fs/xfs/xfs_reflink.c | 51 +++++++++++++++++++++++----------------------------
> 1 file changed, 23 insertions(+), 28 deletions(-)
>
> diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
> index f33f737..7979d46 100644
> --- a/fs/xfs/xfs_reflink.c
> +++ b/fs/xfs/xfs_reflink.c
> @@ -512,53 +512,49 @@ xfs_reflink_cancel_cow_blocks(
> xfs_fileoff_t offset_fsb,
> xfs_fileoff_t end_fsb)
> {
> - struct xfs_bmbt_irec irec;
> - xfs_filblks_t count_fsb;
> + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
> + struct xfs_bmbt_irec got, prev, del;
> + xfs_extnum_t idx;
> xfs_fsblock_t firstfsb;
> struct xfs_defer_ops dfops;
> - int error = 0;
> - int nimaps;
> + int error = 0, eof = 0;
>
> if (!xfs_is_reflink_inode(ip))
> return 0;
>
> - /* Go find the old extent in the CoW fork. */
> - while (offset_fsb < end_fsb) {
> - nimaps = 1;
> - count_fsb = (xfs_filblks_t)(end_fsb - offset_fsb);
> - error = xfs_bmapi_read(ip, offset_fsb, count_fsb, &irec,
> - &nimaps, XFS_BMAPI_COWFORK);
> - if (error)
> - break;
> - ASSERT(nimaps == 1);
> + xfs_bmap_search_extents(ip, offset_fsb, XFS_COW_FORK, &eof, &idx,
> + &got, &prev);
> + if (eof)
> + return 0;
>
> - trace_xfs_reflink_cancel_cow(ip, &irec);
> + while (got.br_startoff < end_fsb) {
> + del = got;
> + xfs_trim_extent(&del, offset_fsb, end_fsb - offset_fsb);
> + trace_xfs_reflink_cancel_cow(ip, &del);
>
> - if (irec.br_startblock == DELAYSTARTBLOCK) {
> - /* Remove the mapping from the CoW fork. */
> - error = xfs_bunmapi_cow(ip, &irec);
> + if (isnullstartblock(del.br_startblock)) {
> + error = xfs_bmap_del_extent_delay(ip, XFS_COW_FORK,
> + &idx, &got, &del);
> if (error)
> break;
> - } else if (irec.br_startblock == HOLESTARTBLOCK) {
> - /* empty */
> } else {
> xfs_trans_ijoin(*tpp, ip, 0);
> xfs_defer_init(&dfops, &firstfsb);
>
> /* Free the CoW orphan record. */
> error = xfs_refcount_free_cow_extent(ip->i_mount,
> - &dfops, irec.br_startblock,
> - irec.br_blockcount);
> + &dfops, del.br_startblock,
> + del.br_blockcount);
> if (error)
> break;
>
> xfs_bmap_add_free(ip->i_mount, &dfops,
> - irec.br_startblock, irec.br_blockcount,
> + del.br_startblock, del.br_blockcount,
> NULL);
>
> /* Update quota accounting */
> xfs_trans_mod_dquot_byino(*tpp, ip, XFS_TRANS_DQ_BCOUNT,
> - -(long)irec.br_blockcount);
> + -(long)del.br_blockcount);
>
> /* Roll the transaction */
> error = xfs_defer_finish(tpp, &dfops, ip);
> @@ -568,13 +564,12 @@ xfs_reflink_cancel_cow_blocks(
> }
>
> /* Remove the mapping from the CoW fork. */
> - error = xfs_bunmapi_cow(ip, &irec);
> - if (error)
> - break;
> + xfs_bmap_del_extent_cow(ip, &idx, &got, &del);
> }
>
> - /* Roll on... */
> - offset_fsb = irec.br_startoff + irec.br_blockcount;
> + if (++idx >= ifp->if_bytes / sizeof(struct xfs_bmbt_rec))
> + return 0;
> + xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), &got);
> }
>
> return error;
> --
> 2.1.4
>
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