NFS: Introduce trace events triggered by page writeback errors
Try to capture the reason for the writeback path tagging an error on
a page.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 52cab65..2178771 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -593,6 +593,7 @@ nfs_lock_and_join_requests(struct page *page)
static void nfs_write_error(struct nfs_page *req, int error)
{
nfs_set_pageerror(page_file_mapping(req->wb_page));
+ trace_nfs_write_error(req, error);
nfs_mapping_set_error(req->wb_page, error);
nfs_inode_remove_request(req);
nfs_end_page_writeback(req);
@@ -999,6 +1000,7 @@ static void nfs_write_completion(struct nfs_pgio_header *hdr)
if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
(hdr->good_bytes < bytes)) {
nfs_set_pageerror(page_file_mapping(req->wb_page));
+ trace_nfs_comp_error(req, hdr->error);
nfs_mapping_set_error(req->wb_page, hdr->error);
goto remove_req;
}
@@ -1847,6 +1849,7 @@ static void nfs_commit_release_pages(struct nfs_commit_data *data)
(long long)req_offset(req));
if (status < 0) {
if (req->wb_page) {
+ trace_nfs_commit_error(req, status);
nfs_mapping_set_error(req->wb_page, status);
nfs_inode_remove_request(req);
}