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From: Brian Foster <bfoster@redhat.com>
To: xfs@oss.sgi.com
Subject: [PATCH v4 5/8] xfs: create function to scan and clear EOFBLOCKS inodes
Date: Thu, 27 Sep 2012 13:45:49 -0400	[thread overview]
Message-ID: <1348767952-24229-6-git-send-email-bfoster@redhat.com> (raw)
In-Reply-To: <1348767952-24229-1-git-send-email-bfoster@redhat.com>

xfs_inodes_free_eofblocks() implements scanning functionality for
EOFBLOCKS inodes. It uses the AG iterator to walk the tagged inodes
and free post-EOF blocks via the xfs_inode_free_eofblocks() execute
function. The scan can be invoked in best-effort mode or wait
(force) mode.

A best-effort scan (default) handles all inodes that do not have a
dirty cache and we successfully acquire the io lock via trylock. In
wait mode, we continue to cycle through an AG until all inodes are
handled.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
 fs/xfs/xfs_sync.c  |   40 ++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_sync.h  |    1 +
 fs/xfs/xfs_trace.h |    1 +
 3 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/fs/xfs/xfs_sync.c b/fs/xfs/xfs_sync.c
index 0da93c9..6854800 100644
--- a/fs/xfs/xfs_sync.c
+++ b/fs/xfs/xfs_sync.c
@@ -1014,6 +1014,46 @@ xfs_reclaim_inodes_count(
 	return reclaimable;
 }
 
+STATIC int
+xfs_inode_free_eofblocks(
+	struct xfs_inode	*ip,
+	struct xfs_perag	*pag,
+	int			flags,
+	void			*args)
+{
+	int ret;
+	bool force = flags & SYNC_WAIT;
+
+	if (!xfs_can_free_eofblocks(ip, false)) {
+		/* inode could be preallocated or append-only */
+		trace_xfs_inode_free_eofblocks_invalid(ip);
+		xfs_inode_clear_eofblocks_tag(ip);
+		return 0;
+	}
+
+	if (!force && mapping_tagged(VFS_I(ip)->i_mapping,
+				     PAGECACHE_TAG_DIRTY))
+		return 0;
+
+	ret = xfs_free_eofblocks(ip->i_mount, ip, true);
+
+	/* ignore EAGAIN on a best effort scan */
+	if (!force && (ret == EAGAIN))
+		ret = 0;
+
+	return ret;
+}
+
+int
+xfs_inodes_free_eofblocks(
+	struct xfs_mount	*mp,
+	int			flags)
+{
+	ASSERT((flags & ~(SYNC_TRYLOCK|SYNC_WAIT)) == 0);
+	return xfs_inode_ag_iterator_tag(mp, xfs_inode_free_eofblocks, flags,
+					 NULL, XFS_ICI_EOFBLOCKS_TAG);
+}
+
 void
 xfs_inode_set_eofblocks_tag(
 	xfs_inode_t	*ip)
diff --git a/fs/xfs/xfs_sync.h b/fs/xfs/xfs_sync.h
index 463ea0a..307654a 100644
--- a/fs/xfs/xfs_sync.h
+++ b/fs/xfs/xfs_sync.h
@@ -45,6 +45,7 @@ void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp, struct xfs_perag *pag,
 
 void xfs_inode_set_eofblocks_tag(struct xfs_inode *ip);
 void xfs_inode_clear_eofblocks_tag(struct xfs_inode *ip);
+int xfs_inodes_free_eofblocks(struct xfs_mount *, int);
 
 int xfs_sync_inode_grab(struct xfs_inode *ip);
 int xfs_inode_ag_iterator(struct xfs_mount *mp,
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 6f46e03..cb52346 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -589,6 +589,7 @@ DEFINE_INODE_EVENT(xfs_dquot_dqdetach);
 
 DEFINE_INODE_EVENT(xfs_inode_set_eofblocks_tag);
 DEFINE_INODE_EVENT(xfs_inode_clear_eofblocks_tag);
+DEFINE_INODE_EVENT(xfs_inode_free_eofblocks_invalid);
 
 DECLARE_EVENT_CLASS(xfs_iref_class,
 	TP_PROTO(struct xfs_inode *ip, unsigned long caller_ip),
-- 
1.7.7.6

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  parent reply	other threads:[~2012-09-27 17:42 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-27 17:45 [PATCH v4 0/8] speculative preallocation inode tracking Brian Foster
2012-09-27 17:45 ` [PATCH v4 1/8] xfs: add EOFBLOCKS inode tagging/untagging Brian Foster
2012-09-28  7:04   ` Dave Chinner
2012-09-28 20:40     ` Brian Foster
2012-09-27 17:45 ` [PATCH v4 2/8] xfs: support a tag-based inode_ag_iterator Brian Foster
2012-09-28  7:05   ` Dave Chinner
2012-09-27 17:45 ` [PATCH v4 3/8] xfs: create helper to check whether to free eofblocks on inode Brian Foster
2012-09-28  6:59   ` Dave Chinner
2012-09-28 20:41     ` Brian Foster
2012-09-27 17:45 ` [PATCH v4 4/8] xfs: export xfs_free_eofblocks() and return EAGAIN on trylock failure Brian Foster
2012-09-28  7:00   ` Dave Chinner
2012-09-27 17:45 ` Brian Foster [this message]
2012-09-28  7:21   ` [PATCH v4 5/8] xfs: create function to scan and clear EOFBLOCKS inodes Dave Chinner
2012-09-28 20:41     ` Brian Foster
2012-09-27 17:45 ` [PATCH v4 6/8] xfs: add XFS_IOC_FREE_EOFBLOCKS ioctl Brian Foster
2012-09-28  7:25   ` Dave Chinner
2012-09-27 17:45 ` [PATCH v4 7/8] xfs: add enhanced filtering to EOFBLOCKS scan Brian Foster
2012-09-28  7:53   ` Dave Chinner
2012-09-28 20:42     ` Brian Foster
2012-09-27 17:45 ` [PATCH v4 8/8] xfs: add background scanning to clear EOFBLOCKS inodes Brian Foster
2012-09-28  8:00   ` Dave Chinner
2012-09-28 20:42     ` Brian Foster

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