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From: Christoph Hellwig <hch@lst.de>
To: linux-xfs@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH 25/34] xfs: remove xfs_reflink_trim_irec_to_next_cow
Date: Wed, 23 May 2018 16:43:48 +0200	[thread overview]
Message-ID: <20180523144357.18985-26-hch@lst.de> (raw)
In-Reply-To: <20180523144357.18985-1-hch@lst.de>

In the only caller we just did a lookup in the COW extent tree for
the same offset.  Reuse that result and save a lookup, as well as
shortening the ilock hold time.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/xfs_aops.c    | 25 +++++++++++++++++--------
 fs/xfs/xfs_reflink.c | 33 ---------------------------------
 fs/xfs/xfs_reflink.h |  2 --
 3 files changed, 17 insertions(+), 43 deletions(-)

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index a4b4a7037deb..354d26d66c12 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -383,11 +383,12 @@ xfs_map_blocks(
 	struct xfs_inode	*ip = XFS_I(inode);
 	struct xfs_mount	*mp = ip->i_mount;
 	ssize_t			count = i_blocksize(inode);
-	xfs_fileoff_t		offset_fsb, end_fsb;
+	xfs_fileoff_t		offset_fsb, end_fsb, cow_fsb = 0;
 	int			whichfork = XFS_DATA_FORK;
 	struct xfs_iext_cursor	icur;
 	int			error = 0;
 	int			nimaps = 1;
+	bool			cow_valid = false;
 
 	if (XFS_FORCED_SHUTDOWN(mp))
 		return -EIO;
@@ -407,8 +408,11 @@ xfs_map_blocks(
 	 * it directly instead of looking up anything in the data fork.
 	 */
 	if (xfs_is_reflink_inode(ip) &&
-	    xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, imap) &&
-	    imap->br_startoff <= offset_fsb) {
+	    xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, imap)) {
+		cow_fsb = imap->br_startoff;
+		cow_valid = true;
+	}
+	if (cow_valid && cow_fsb <= offset_fsb) {
 		xfs_iunlock(ip, XFS_ILOCK_SHARED);
 		/*
 		 * Truncate can race with writeback since writeback doesn't
@@ -430,6 +434,10 @@ xfs_map_blocks(
 
 	error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
 				imap, &nimaps, XFS_BMAPI_ENTIRE);
+	xfs_iunlock(ip, XFS_ILOCK_SHARED);
+	if (error)
+		return error;
+
 	if (!nimaps) {
 		/*
 		 * Lookup returns no match? Beyond eof? regardless,
@@ -451,16 +459,17 @@ xfs_map_blocks(
 		 * is a pending CoW reservation before the end of this extent,
 		 * so that we pick up the COW extents in the next iteration.
 		 */
-		xfs_reflink_trim_irec_to_next_cow(ip, offset_fsb, imap);
+		if (cow_valid &&
+		    cow_fsb < imap->br_startoff + imap->br_blockcount) {
+			imap->br_blockcount = cow_fsb - imap->br_startoff;
+			trace_xfs_reflink_trim_irec(ip, imap);
+		}
+
 		if (imap->br_state == XFS_EXT_UNWRITTEN)
 			*type = XFS_IO_UNWRITTEN;
 		else
 			*type = XFS_IO_OVERWRITE;
 	}
-	xfs_iunlock(ip, XFS_ILOCK_SHARED);
-	if (error)
-		return error;
-
 done:
 	switch (*type) {
 	case XFS_IO_HOLE:
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 8e5eb8e70c89..ff76bc56ff3d 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -484,39 +484,6 @@ xfs_reflink_allocate_cow(
 	return error;
 }
 
-/*
- * 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 15a456492667..e8d4d50c629f 100644
--- a/fs/xfs/xfs_reflink.h
+++ b/fs/xfs/xfs_reflink.h
@@ -32,8 +32,6 @@ extern int xfs_reflink_allocate_cow(struct xfs_inode *ip,
 		struct xfs_bmbt_irec *imap, bool *shared, uint *lockmode);
 extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
 		xfs_off_t count);
-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,
-- 
2.17.0

  parent reply	other threads:[~2018-05-23 14:43 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-23 14:43 buffered I/O without buffer heads in xfs and iomap v3 Christoph Hellwig
2018-05-23 14:43 ` [PATCH 01/34] block: add a lower-level bio_add_page interface Christoph Hellwig
2018-05-30  5:28   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 02/34] fs: factor out a __generic_write_end helper Christoph Hellwig
2018-05-30  5:30   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 03/34] fs: move page_cache_seek_hole_data to iomap.c Christoph Hellwig
2018-05-30  5:31   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 04/34] fs: remove the buffer_unwritten check in page_seek_hole_data Christoph Hellwig
2018-05-30  5:36   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 05/34] fs: use ->is_partially_uptodate in page_cache_seek_hole_data Christoph Hellwig
2018-05-30  5:41   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 06/34] mm: give the 'ret' variable a better name __do_page_cache_readahead Christoph Hellwig
2018-05-30  5:42   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 07/34] mm: return an unsigned int from __do_page_cache_readahead Christoph Hellwig
2018-05-30  5:44   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 08/34] mm: split ->readpages calls to avoid non-contiguous pages lists Christoph Hellwig
2018-05-30  5:46   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 09/34] iomap: inline data should be an iomap type, not a flag Christoph Hellwig
2018-05-30  5:49   ` Darrick J. Wong
2018-05-30  5:49     ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 10/34] iomap: fix the comment describing IOMAP_NOWAIT Christoph Hellwig
2018-05-30  5:49   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 11/34] iomap: move IOMAP_F_BOUNDARY to gfs2 Christoph Hellwig
2018-05-30  5:50   ` Darrick J. Wong
2018-05-30  9:30     ` [Cluster-devel] " Steven Whitehouse
2018-05-30  9:59       ` Christoph Hellwig
2018-05-30 10:02         ` Steven Whitehouse
2018-05-30 10:10           ` Christoph Hellwig
2018-05-30 10:10             ` Christoph Hellwig
2018-05-30 10:10             ` Christoph Hellwig
2018-05-30 10:12             ` Steven Whitehouse
2018-05-30 11:03               ` Andreas Gruenbacher
2018-05-23 14:43 ` [PATCH 12/34] iomap: use __bio_add_page in iomap_dio_zero Christoph Hellwig
2018-05-30  5:51   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 13/34] iomap: add a iomap_sector helper Christoph Hellwig
2018-05-30  5:52   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 14/34] iomap: add an iomap-based bmap implementation Christoph Hellwig
2018-05-30  5:54   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 15/34] iomap: add an iomap-based readpage and readpages implementation Christoph Hellwig
2018-05-30  6:11   ` Darrick J. Wong
2018-05-30  6:23     ` Christoph Hellwig
2018-05-23 14:43 ` [PATCH 16/34] iomap: add initial support for writes without buffer heads Christoph Hellwig
2018-05-30  6:21   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 17/34] xfs: use iomap_bmap Christoph Hellwig
2018-05-30  6:14   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 18/34] xfs: use iomap for blocksize == PAGE_SIZE readpage and readpages Christoph Hellwig
2018-05-30  6:22   ` Darrick J. Wong
2018-05-23 14:43 ` [PATCH 19/34] xfs: simplify xfs_bmap_punch_delalloc_range Christoph Hellwig
2018-05-23 16:17   ` Brian Foster
2018-05-24  8:01     ` Christoph Hellwig
2018-05-23 14:43 ` [PATCH 20/34] xfs: simplify xfs_aops_discard_page Christoph Hellwig
2018-05-23 14:43 ` [PATCH 21/34] xfs: move locking into xfs_bmap_punch_delalloc_range Christoph Hellwig
2018-05-23 14:43 ` [PATCH 22/34] xfs: make xfs_writepage_map extent map centric Christoph Hellwig
2018-05-24 14:59   ` Brian Foster
2018-05-24 16:53     ` Christoph Hellwig
2018-05-24 18:13       ` Brian Foster
2018-05-25  6:19         ` Christoph Hellwig
2018-05-25 11:35           ` Brian Foster
2018-05-28  7:15             ` Christoph Hellwig
2018-05-29 11:26               ` Brian Foster
2018-05-29 13:08                 ` Christoph Hellwig
2018-05-29 17:04                   ` Brian Foster
2018-05-23 14:43 ` [PATCH 23/34] xfs: remove the now unused XFS_BMAPI_IGSTATE flag Christoph Hellwig
2018-05-23 14:43 ` [PATCH 24/34] xfs: remove xfs_reflink_find_cow_mapping Christoph Hellwig
2018-05-23 14:43 ` Christoph Hellwig [this message]
2018-05-24 14:59   ` [PATCH 25/34] xfs: remove xfs_reflink_trim_irec_to_next_cow Brian Foster
2018-05-24 15:06     ` Brian Foster
2018-05-24 17:10       ` Christoph Hellwig
2018-05-23 14:43 ` [PATCH 26/34] xfs: simplify xfs_map_blocks by using xfs_iext_lookup_extent directly Christoph Hellwig
2018-05-23 14:43 ` [PATCH 27/34] xfs: don't clear imap_valid for a non-uptodate buffers Christoph Hellwig
2018-05-23 14:43 ` [PATCH 28/34] xfs: remove the imap_valid flag Christoph Hellwig
2018-05-23 14:43 ` [PATCH 29/34] xfs: don't look at buffer heads in xfs_add_to_ioend Christoph Hellwig
2018-05-23 14:43 ` [PATCH 30/34] xfs: move all writeback buffer_head manipulation into xfs_map_at_offset Christoph Hellwig
2018-05-23 14:43 ` [PATCH 31/34] xfs: remove xfs_start_page_writeback Christoph Hellwig
2018-05-23 14:43 ` [PATCH 32/34] xfs: refactor the tail of xfs_writepage_map Christoph Hellwig
2018-05-23 14:43 ` [PATCH 33/34] xfs: do not set the page uptodate in xfs_writepage_map Christoph Hellwig
2018-05-23 14:43 ` [PATCH 34/34] xfs: allow writeback on pages without buffer heads Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2018-05-18 16:47 buffered I/O without buffer heads in xfs and iomap v2 Christoph Hellwig
2018-05-18 16:48 ` [PATCH 25/34] xfs: remove xfs_reflink_trim_irec_to_next_cow Christoph Hellwig

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