From: Brian Foster <bfoster@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 09/21] xfs: remove xfs_reflink_trim_irec_to_next_cow
Date: Mon, 4 Jun 2018 08:25:09 -0400 [thread overview]
Message-ID: <20180604122509.GB110455@bfoster.bfoster> (raw)
In-Reply-To: <20180531180759.21631-10-hch@lst.de>
On Thu, May 31, 2018 at 08:07:47PM +0200, Christoph Hellwig wrote:
> We already have to check for overlapping COW extents everytime we
> come back to a page in xfs_writepage_map / xfs_map_cow, so this
> additional trim is not required.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
Reviewed-by: Brian Foster <bfoster@redhat.com>
> fs/xfs/xfs_aops.c | 7 -------
> fs/xfs/xfs_reflink.c | 33 ---------------------------------
> fs/xfs/xfs_reflink.h | 2 --
> fs/xfs/xfs_trace.h | 1 -
> 4 files changed, 43 deletions(-)
>
> diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> index 2966d62b0594..9b5a4b6e268c 100644
> --- a/fs/xfs/xfs_aops.c
> +++ b/fs/xfs/xfs_aops.c
> @@ -416,13 +416,6 @@ xfs_map_blocks(
> offset_fsb = XFS_B_TO_FSBT(mp, offset);
> error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
> imap, &nimaps, XFS_BMAPI_ENTIRE);
> - /*
> - * Truncate an overwrite extent if there's a pending CoW
> - * reservation before the end of this extent. This forces us
> - * to come back to writepage to take care of the CoW.
> - */
> - if (nimaps && type == XFS_IO_OVERWRITE)
> - xfs_reflink_trim_irec_to_next_cow(ip, offset_fsb, imap);
> xfs_iunlock(ip, XFS_ILOCK_SHARED);
>
> if (error)
> diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
> index 713e857d9ffa..d0092c864458 100644
> --- a/fs/xfs/xfs_reflink.c
> +++ b/fs/xfs/xfs_reflink.c
> @@ -514,39 +514,6 @@ xfs_reflink_find_cow_mapping(
> return true;
> }
>
> -/*
> - * Trim an extent to end at the next CoW reservation past offset_fsb.
> - */
> -void
> -xfs_reflink_trim_irec_to_next_cow(
> - struct xfs_inode *ip,
> - xfs_fileoff_t offset_fsb,
> - struct xfs_bmbt_irec *imap)
> -{
> - struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
> - struct xfs_bmbt_irec got;
> - struct xfs_iext_cursor icur;
> -
> - if (!xfs_is_reflink_inode(ip))
> - return;
> -
> - /* Find the extent in the CoW fork. */
> - if (!xfs_iext_lookup_extent(ip, ifp, offset_fsb, &icur, &got))
> - return;
> -
> - /* This is the extent before; try sliding up one. */
> - if (got.br_startoff < offset_fsb) {
> - if (!xfs_iext_next_extent(ifp, &icur, &got))
> - return;
> - }
> -
> - if (got.br_startoff >= imap->br_startoff + imap->br_blockcount)
> - return;
> -
> - imap->br_blockcount = got.br_startoff - imap->br_startoff;
> - trace_xfs_reflink_trim_irec(ip, imap);
> -}
> -
> /*
> * Cancel CoW reservations for some block range of an inode.
> *
> diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h
> index 701487bab468..c0a25609007b 100644
> --- a/fs/xfs/xfs_reflink.h
> +++ b/fs/xfs/xfs_reflink.h
> @@ -34,8 +34,6 @@ extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
> xfs_off_t count);
> extern bool xfs_reflink_find_cow_mapping(struct xfs_inode *ip, xfs_off_t offset,
> struct xfs_bmbt_irec *imap);
> -extern void xfs_reflink_trim_irec_to_next_cow(struct xfs_inode *ip,
> - xfs_fileoff_t offset_fsb, struct xfs_bmbt_irec *imap);
>
> extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
> struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
> diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
> index 9d4c4ca24fe6..041045a8d65c 100644
> --- a/fs/xfs/xfs_trace.h
> +++ b/fs/xfs/xfs_trace.h
> @@ -3228,7 +3228,6 @@ DEFINE_RW_EVENT(xfs_reflink_reserve_cow);
>
> DEFINE_SIMPLE_IO_EVENT(xfs_reflink_bounce_dio_write);
> DEFINE_IOMAP_EVENT(xfs_reflink_find_cow_mapping);
> -DEFINE_INODE_IREC_EVENT(xfs_reflink_trim_irec);
>
> DEFINE_SIMPLE_IO_EVENT(xfs_reflink_cancel_cow_range);
> DEFINE_SIMPLE_IO_EVENT(xfs_reflink_end_cow);
> --
> 2.17.0
>
> --
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next prev parent reply other threads:[~2018-06-04 12:25 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-31 18:07 buffered writes without buffer heads in xfs and iomap v5 Christoph Hellwig
2018-05-31 18:07 ` [PATCH 01/21] fs: factor out a __generic_write_end helper Christoph Hellwig
2018-05-31 18:07 ` [PATCH 02/21] iomap: add initial support for writes without buffer heads Christoph Hellwig
2018-05-31 18:07 ` [PATCH 03/21] xfs: simplify xfs_bmap_punch_delalloc_range Christoph Hellwig
2018-05-31 18:07 ` [PATCH 04/21] xfs: simplify xfs_aops_discard_page Christoph Hellwig
2018-05-31 18:07 ` [PATCH 05/21] xfs: move locking into xfs_bmap_punch_delalloc_range Christoph Hellwig
2018-05-31 18:07 ` [PATCH 06/21] xfs: do not set the page uptodate in xfs_writepage_map Christoph Hellwig
2018-05-31 18:07 ` [PATCH 07/21] xfs: don't clear imap_valid for a non-uptodate buffers Christoph Hellwig
2018-05-31 18:07 ` [PATCH 08/21] xfs: don't use XFS_BMAPI_IGSTATE in xfs_map_blocks Christoph Hellwig
2018-06-04 12:25 ` Brian Foster
2018-05-31 18:07 ` [PATCH 09/21] xfs: remove xfs_reflink_trim_irec_to_next_cow Christoph Hellwig
2018-06-04 12:25 ` Brian Foster [this message]
2018-05-31 18:07 ` [PATCH 10/21] xfs: remove xfs_map_cow Christoph Hellwig
2018-06-04 12:25 ` Brian Foster
2018-06-13 15:30 ` Christoph Hellwig
2018-05-31 18:07 ` [PATCH 11/21] xfs: rename the offset variable in xfs_writepage_map Christoph Hellwig
2018-06-04 12:25 ` Brian Foster
2018-05-31 18:07 ` [PATCH 12/21] xfs: make xfs_writepage_map extent map centric Christoph Hellwig
2018-06-04 12:26 ` Brian Foster
2018-05-31 18:07 ` [PATCH 13/21] xfs: remove the now unused XFS_BMAPI_IGSTATE flag Christoph Hellwig
2018-06-04 12:27 ` Brian Foster
2018-05-31 18:07 ` [PATCH 14/21] xfs: remove xfs_reflink_find_cow_mapping Christoph Hellwig
2018-05-31 18:07 ` [PATCH 15/21] xfs: simplify xfs_map_blocks by using xfs_iext_lookup_extent directly Christoph Hellwig
2018-05-31 18:07 ` [PATCH 16/21] xfs: remove the imap_valid flag Christoph Hellwig
2018-05-31 18:07 ` [PATCH 17/21] xfs: don't look at buffer heads in xfs_add_to_ioend Christoph Hellwig
2018-05-31 18:07 ` [PATCH 18/21] xfs: move all writeback buffer_head manipulation into xfs_map_at_offset Christoph Hellwig
2018-05-31 18:07 ` [PATCH 19/21] xfs: remove xfs_start_page_writeback Christoph Hellwig
2018-05-31 18:07 ` [PATCH 20/21] xfs: refactor the tail of xfs_writepage_map Christoph Hellwig
2018-05-31 18:07 ` [PATCH 21/21] xfs: allow writeback on pages without buffer heads Christoph Hellwig
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