f2fs: support to trace f2fs_fiemap()

to show f2fs_fiemap()'s result as below:

f2fs_fiemap: dev = (251,0), ino = 7, lblock:0, pblock:1625292800, len:2097152, flags:0, ret:0
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

@@ -1813,6 +1813,7 @@ static int f2fs_xattr_fiemap(struct inode *inode,
 			flags |= FIEMAP_EXTENT_LAST;
 
 		err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
+		trace_f2fs_fiemap(inode, 0, phys, len, flags, err);
 		if (err || err == 1)
 			return err;
 	}
@@ -1836,8 +1837,10 @@ static int f2fs_xattr_fiemap(struct inode *inode,
 		flags = FIEMAP_EXTENT_LAST;
 	}
 
-	if (phys)
+	if (phys) {
 		err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
+		trace_f2fs_fiemap(inode, 0, phys, len, flags, err);
+	}
 
 	return (err < 0 ? err : 0);
 }
@@ -1931,6 +1934,7 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 
 		ret = fiemap_fill_next_extent(fieinfo, logical,
 				phys, size, flags);
+		trace_f2fs_fiemap(inode, logical, phys, size, flags, ret);
 		if (ret)
 			goto out;
 		size = 0;

fs/f2fs/inline.c

@@ -12,6 +12,7 @@
 
 #include "f2fs.h"
 #include "node.h"
+#include <trace/events/f2fs.h>
 
 bool f2fs_may_inline_data(struct inode *inode)
 {
@@ -776,6 +777,7 @@ int f2fs_inline_data_fiemap(struct inode *inode,
 	byteaddr += (char *)inline_data_addr(inode, ipage) -
 					(char *)F2FS_INODE(ipage);
 	err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
+	trace_f2fs_fiemap(inode, start, byteaddr, ilen, flags, err);
 out:
 	f2fs_put_page(ipage, 1);
 	return err;

include/trace/events/f2fs.h

@@ -1917,6 +1917,43 @@ TRACE_EVENT(f2fs_bmap,
 		(unsigned long long)__entry->pblock)
 );
 
+TRACE_EVENT(f2fs_fiemap,
+
+	TP_PROTO(struct inode *inode, sector_t lblock, sector_t pblock,
+		unsigned long long len, unsigned int flags, int ret),
+
+	TP_ARGS(inode, lblock, pblock, len, flags, ret),
+
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(ino_t, ino)
+		__field(sector_t, lblock)
+		__field(sector_t, pblock)
+		__field(unsigned long long, len)
+		__field(unsigned int, flags)
+		__field(int, ret)
+	),
+
+	TP_fast_assign(
+		__entry->dev		= inode->i_sb->s_dev;
+		__entry->ino		= inode->i_ino;
+		__entry->lblock		= lblock;
+		__entry->pblock		= pblock;
+		__entry->len		= len;
+		__entry->flags		= flags;
+		__entry->ret		= ret;
+	),
+
+	TP_printk("dev = (%d,%d), ino = %lu, lblock:%lld, pblock:%lld, "
+		"len:%llu, flags:%u, ret:%d",
+		show_dev_ino(__entry),
+		(unsigned long long)__entry->lblock,
+		(unsigned long long)__entry->pblock,
+		__entry->len,
+		__entry->flags,
+		__entry->ret)
+);
+
 #endif /* _TRACE_F2FS_H */
 
  /* This part must be outside protection */