xfs: add an xfs_zero_eof() tracepoint

Add a tracepoint in xfs_zero_eof() to facilitate tracking and debugging
EOF zeroing events. This has proven useful in the context of other
direct I/O tracepoints to ensure EOF zeroing occurs within appropriate
file ranges.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 347b3e0..541dcfb 100644 (file)
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -482,6 +482,8 @@ xfs_zero_eof(
        ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
        ASSERT(offset > isize);
 
+       trace_xfs_zero_eof(ip, isize, offset - isize);
+
        /*
         * First handle zeroing the block on which isize resides.
         *

diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 5ed36b1..957f5cc 100644 (file)
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -1312,6 +1312,7 @@ DEFINE_SIMPLE_IO_EVENT(xfs_delalloc_enospc);
 DEFINE_SIMPLE_IO_EVENT(xfs_unwritten_convert);
 DEFINE_SIMPLE_IO_EVENT(xfs_get_blocks_notfound);
 DEFINE_SIMPLE_IO_EVENT(xfs_setfilesize);
+DEFINE_SIMPLE_IO_EVENT(xfs_zero_eof);
 
 DECLARE_EVENT_CLASS(xfs_itrunc_class,
        TP_PROTO(struct xfs_inode *ip, xfs_fsize_t new_size),