From ed3743a6d4f309f5278c87a69e3125382b78455c Mon Sep 17 00:00:00 2001
From: Weston Andros Adamson <dros@primarydata.com>
Date: Fri, 1 Apr 2016 11:42:29 -0400
Subject: nfs: add debug to directio "good_bytes" counting
This will pop a warning if we count too many good bytes.
Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
fs/nfs/direct.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
(limited to 'fs/nfs/direct.c')
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index c93826e4a8c6..f79d98ae4c10 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -87,6 +87,7 @@ struct nfs_direct_req {
int mirror_count;
ssize_t count, /* bytes actually processed */
+ max_count, /* max expected count */
bytes_left, /* bytes left to be sent */
io_start, /* start of IO */
error; /* any reported error */
@@ -123,6 +124,8 @@ nfs_direct_good_bytes(struct nfs_direct_req *dreq, struct nfs_pgio_header *hdr)
int i;
ssize_t count;
+ WARN_ON_ONCE(dreq->count >= dreq->max_count);
+
if (dreq->mirror_count == 1) {
dreq->mirrors[hdr->pgio_mirror_idx].count += hdr->good_bytes;
dreq->count += hdr->good_bytes;
@@ -593,7 +596,7 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter,
goto out_unlock;
dreq->inode = inode;
- dreq->bytes_left = count;
+ dreq->bytes_left = dreq->max_count = count;
dreq->io_start = pos;
dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
l_ctx = nfs_get_lock_context(dreq->ctx);
@@ -1026,7 +1029,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
goto out_unlock;
dreq->inode = inode;
- dreq->bytes_left = iov_iter_count(iter);
+ dreq->bytes_left = dreq->max_count = iov_iter_count(iter);
dreq->io_start = pos;
dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
l_ctx = nfs_get_lock_context(dreq->ctx);
--
cgit