[PATCH v2 16/18] NFS: Enable tracing of nfs_invalidate_folio() and nfs_launder_folio()

[trondmy@xxxxxxxxxx]

From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
 fs/nfs/file.c     |  9 +++++++--
 fs/nfs/nfstrace.h | 41 +++++++++++++++++++++++++++++++++++------
 2 files changed, 42 insertions(+), 8 deletions(-)

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 3bed75c5250b..bcade290605a 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -411,14 +411,16 @@ static int nfs_write_end(struct file *file, struct address_space *mapping,
 static void nfs_invalidate_folio(struct folio *folio, size_t offset,
 				size_t length)
 {
+	struct inode *inode = folio_file_mapping(folio)->host;
 	dfprintk(PAGECACHE, "NFS: invalidate_folio(%lu, %zu, %zu)\n",
 		 folio->index, offset, length);
 
 	if (offset != 0 || length < folio_size(folio))
 		return;
 	/* Cancel any unstarted writes on this page */
-	nfs_wb_folio_cancel(folio->mapping->host, folio);
+	nfs_wb_folio_cancel(inode, folio);
 	folio_wait_fscache(folio);
+	trace_nfs_invalidate_folio(inode, folio);
 }
 
 /*
@@ -479,12 +481,15 @@ static void nfs_check_dirty_writeback(struct folio *folio,
 static int nfs_launder_folio(struct folio *folio)
 {
 	struct inode *inode = folio->mapping->host;
+	int ret;
 
 	dfprintk(PAGECACHE, "NFS: launder_folio(%ld, %llu)\n",
 		inode->i_ino, folio_pos(folio));
 
 	folio_wait_fscache(folio);
-	return nfs_wb_folio(inode, folio);
+	ret = nfs_wb_folio(inode, folio);
+	trace_nfs_launder_folio_done(inode, folio, ret);
+	return ret;
 }
 
 static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
index b686b615586e..d3aa330fef36 100644
--- a/fs/nfs/nfstrace.h
+++ b/fs/nfs/nfstrace.h
@@ -933,7 +933,7 @@ TRACE_EVENT(nfs_sillyrename_unlink,
 		)
 );
 
-TRACE_EVENT(nfs_aop_readpage,
+DECLARE_EVENT_CLASS(nfs_folio_event,
 		TP_PROTO(
 			const struct inode *inode,
 			struct folio *folio
@@ -947,6 +947,7 @@ TRACE_EVENT(nfs_aop_readpage,
 			__field(u64, fileid)
 			__field(u64, version)
 			__field(loff_t, offset)
+			__field(u32, count)
 		),
 
 		TP_fast_assign(
@@ -957,18 +958,28 @@ TRACE_EVENT(nfs_aop_readpage,
 			__entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
 			__entry->version = inode_peek_iversion_raw(inode);
 			__entry->offset = folio_file_pos(folio);
+			__entry->count = nfs_folio_length(folio);
 		),
 
 		TP_printk(
-			"fileid=%02x:%02x:%llu fhandle=0x%08x version=%llu offset=%lld",
+			"fileid=%02x:%02x:%llu fhandle=0x%08x version=%llu "
+			"offset=%lld count=%u",
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
 			__entry->fhandle, __entry->version,
-			__entry->offset
+			__entry->offset, __entry->count
 		)
 );
 
-TRACE_EVENT(nfs_aop_readpage_done,
+#define DEFINE_NFS_FOLIO_EVENT(name) \
+	DEFINE_EVENT(nfs_folio_event, name, \
+			TP_PROTO( \
+				const struct inode *inode, \
+				struct folio *folio \
+			), \
+			TP_ARGS(inode, folio))
+
+DECLARE_EVENT_CLASS(nfs_folio_event_done,
 		TP_PROTO(
 			const struct inode *inode,
 			struct folio *folio,
@@ -984,6 +995,7 @@ TRACE_EVENT(nfs_aop_readpage_done,
 			__field(u64, fileid)
 			__field(u64, version)
 			__field(loff_t, offset)
+			__field(u32, count)
 		),
 
 		TP_fast_assign(
@@ -994,18 +1006,35 @@ TRACE_EVENT(nfs_aop_readpage_done,
 			__entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
 			__entry->version = inode_peek_iversion_raw(inode);
 			__entry->offset = folio_file_pos(folio);
+			__entry->count = nfs_folio_length(folio);
 			__entry->ret = ret;
 		),
 
 		TP_printk(
-			"fileid=%02x:%02x:%llu fhandle=0x%08x version=%llu offset=%lld ret=%d",
+			"fileid=%02x:%02x:%llu fhandle=0x%08x version=%llu "
+			"offset=%lld count=%u ret=%d",
 			MAJOR(__entry->dev), MINOR(__entry->dev),
 			(unsigned long long)__entry->fileid,
 			__entry->fhandle, __entry->version,
-			__entry->offset, __entry->ret
+			__entry->offset, __entry->count, __entry->ret
 		)
 );
 
+#define DEFINE_NFS_FOLIO_EVENT_DONE(name) \
+	DEFINE_EVENT(nfs_folio_event_done, name, \
+			TP_PROTO( \
+				const struct inode *inode, \
+				struct folio *folio, \
+				int ret \
+			), \
+			TP_ARGS(inode, folio, ret))
+
+DEFINE_NFS_FOLIO_EVENT(nfs_aop_readpage);
+DEFINE_NFS_FOLIO_EVENT_DONE(nfs_aop_readpage_done);
+
+DEFINE_NFS_FOLIO_EVENT(nfs_invalidate_folio);
+DEFINE_NFS_FOLIO_EVENT_DONE(nfs_launder_folio_done);
+
 TRACE_EVENT(nfs_aop_readahead,
 		TP_PROTO(
 			const struct inode *inode,
-- 
2.39.0