linux-kernel - [PATCH 2/3] f2fs: support to trace f2fs

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Message-ID: <20200628122940.29665-2-yuchao0@huawei.com>
Date:   Sun, 28 Jun 2020 20:29:39 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH 2/3] f2fs: support to trace f2fs_bmap()

to show f2fs_bmap()'s result as below:

f2fs_bmap: dev = (251,0), ino = 7, lblock:0, pblock:396800

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/data.c              | 14 +++++++++++---
 include/trace/events/f2fs.h | 27 +++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 91dc7b598961..c07a50e4d967 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3713,18 +3713,26 @@ static sector_t f2fs_bmap_compress(struct inode *inode, sector_t block)
 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
 {
 	struct inode *inode = mapping->host;
+	struct buffer_head tmp = {
+		.b_size = i_blocksize(inode),
+	};
+	sector_t blknr = 0;
 
 	if (f2fs_has_inline_data(inode))
-		return 0;
+		goto out;
 
 	/* make sure allocating whole blocks */
 	if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
 		filemap_write_and_wait(mapping);
 
 	if (f2fs_compressed_file(inode))
-		return f2fs_bmap_compress(inode, block);
+		blknr = f2fs_bmap_compress(inode, block);
 
-	return generic_block_bmap(mapping, block, get_data_block_bmap);
+	if (!get_data_block_bmap(inode, block, &tmp, 0))
+		blknr = tmp.b_blocknr;
+out:
+	trace_f2fs_bmap(inode, block, blknr);
+	return blknr;
 }
 
 #ifdef CONFIG_MIGRATION
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 8639ab962a71..3d844c51d283 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -1891,6 +1891,33 @@ TRACE_EVENT(f2fs_iostat,
 		__entry->fs_cdrio, __entry->fs_nrio, __entry->fs_mrio)
 );
 
+TRACE_EVENT(f2fs_bmap,
+
+	TP_PROTO(struct inode *inode, sector_t lblock, sector_t pblock),
+
+	TP_ARGS(inode, lblock, pblock),
+
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(ino_t, ino)
+		__field(sector_t, lblock)
+		__field(sector_t, pblock)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= inode->i_sb->s_dev;
+		__entry->ino		= inode->i_ino;
+		__entry->lblock		= lblock;
+		__entry->pblock		= pblock;
+	),
+
+	TP_printk("dev = (%d,%d), ino = %lu, lblock:%lld, pblock:%lld",
+		show_dev(__entry->dev),
+		__entry->ino,
+		(unsigned long long)__entry->lblock,
+		(unsigned long long)__entry->pblock)
+);
+
 #endif /* _TRACE_F2FS_H */
 
  /* This part must be outside protection */
-- 
2.26.2