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From: "Darrick J. Wong" <djwong@kernel.org>
To: djwong@kernel.org
Cc: Christoph Hellwig <hch@lst.de>,
	linux-xfs@vger.kernel.org, hch@infradead.org,
	david@fromorbit.com, bfoster@redhat.com
Subject: [PATCH 02/11] xfs: don't stall cowblocks scan if we can't take locks
Date: Wed, 27 Jan 2021 22:02:32 -0800
Message-ID: <161181375215.1525026.10295212052129509067.stgit@magnolia> (raw)
In-Reply-To: <161181374062.1525026.14717838769921652940.stgit@magnolia>

From: Darrick J. Wong <djwong@kernel.org>

Don't stall the cowblocks scan on a locked inode if we possibly can.
We'd much rather the background scanner keep moving.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/xfs_icache.c |   21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)


diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index c71eb15e3835..89f9e692fde7 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -1605,17 +1605,31 @@ xfs_inode_free_cowblocks(
 	void			*args)
 {
 	struct xfs_eofblocks	*eofb = args;
+	bool			wait;
 	int			ret = 0;
 
+	wait = eofb && (eofb->eof_flags & XFS_EOF_FLAGS_SYNC);
+
 	if (!xfs_prep_free_cowblocks(ip))
 		return 0;
 
 	if (!xfs_inode_matches_eofb(ip, eofb))
 		return 0;
 
-	/* Free the CoW blocks */
-	xfs_ilock(ip, XFS_IOLOCK_EXCL);
-	xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
+	/*
+	 * If the caller is waiting, return -EAGAIN to keep the background
+	 * scanner moving and revisit the inode in a subsequent pass.
+	 */
+	if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
+		if (wait)
+			return -EAGAIN;
+		return 0;
+	}
+	if (!xfs_ilock_nowait(ip, XFS_MMAPLOCK_EXCL)) {
+		if (wait)
+			ret = -EAGAIN;
+		goto out_iolock;
+	}
 
 	/*
 	 * Check again, nobody else should be able to dirty blocks or change
@@ -1625,6 +1639,7 @@ xfs_inode_free_cowblocks(
 		ret = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, false);
 
 	xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
+out_iolock:
 	xfs_iunlock(ip, XFS_IOLOCK_EXCL);
 
 	return ret;


  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-28  6:02 [PATCHSET v5 00/11] xfs: try harder to reclaim space when we run out Darrick J. Wong
2021-01-28  6:02 ` [PATCH 01/11] xfs: trigger all block gc scans when low on quota space Darrick J. Wong
2021-01-28  6:02 ` Darrick J. Wong [this message]
2021-01-28  6:02 ` [PATCH 03/11] xfs: xfs_inode_free_quota_blocks should scan project quota Darrick J. Wong
2021-01-28  6:02 ` [PATCH 04/11] xfs: move and rename xfs_inode_free_quota_blocks to avoid conflicts Darrick J. Wong
2021-01-28  6:02 ` [PATCH 05/11] xfs: pass flags and return gc errors from xfs_blockgc_free_quota Darrick J. Wong
2021-01-28  6:02 ` [PATCH 06/11] xfs: flush eof/cowblocks if we can't reserve quota for file blocks Darrick J. Wong
2021-01-28  9:26   ` Christoph Hellwig
2021-01-28  6:03 ` [PATCH 07/11] xfs: flush eof/cowblocks if we can't reserve quota for inode creation Darrick J. Wong
2021-01-28  6:03 ` [PATCH 08/11] xfs: flush eof/cowblocks if we can't reserve quota for chown Darrick J. Wong
2021-01-28  6:03 ` [PATCH 09/11] xfs: add a tracepoint for blockgc scans Darrick J. Wong
2021-01-28  6:03 ` [PATCH 10/11] xfs: refactor xfs_icache_free_{eof,cow}blocks call sites Darrick J. Wong
2021-01-28  6:03 ` [PATCH 11/11] xfs: flush speculative space allocations when we run out of space Darrick J. Wong
2021-01-28  9:26   ` Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2021-01-23 18:51 [PATCHSET v4 00/11] xfs: try harder to reclaim space when we run out Darrick J. Wong
2021-01-23 18:52 ` [PATCH 02/11] xfs: don't stall cowblocks scan if we can't take locks Darrick J. Wong
2021-01-25 18:14   ` Brian Foster
2021-01-25 19:54     ` Darrick J. Wong
2021-01-26 13:14       ` Brian Foster
2021-01-26 18:34         ` Darrick J. Wong
2021-01-26 20:03           ` Brian Foster
2021-01-27  3:09             ` Darrick J. Wong
2021-01-18 22:11 [PATCHSET v3 00/11] xfs: try harder to reclaim space when we run out Darrick J. Wong
2021-01-18 22:12 ` [PATCH 02/11] xfs: don't stall cowblocks scan if we can't take locks Darrick J. Wong
2021-01-19  6:49   ` Christoph Hellwig

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