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Subject[PATCH 02/11] NFS: Fix oops in nfs_cancel_commit_list
From: Trond Myklebust <Trond.Myklebust@netapp.com>

Fix two bugs:
- nfs_inode_remove_request will call nfs_clear_request, so we cannot
reference req->wb_page after it. Move the call to dec_zone_page_state so
that it occurs while req->wb_page is still valid.
- Calling nfs_clear_page_writeback is unnecessary since the radix tree
tags will have been cleared by the call to nfs_inode_remove_request.
Replace with a simple call to nfs_unlock_request.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

fs/nfs/write.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index f6675d2..d80fa8c 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -588,10 +588,10 @@ static void nfs_cancel_commit_list(struc

while(!list_empty(head)) {
req = nfs_list_entry(head->next);
+ dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
nfs_list_remove_request(req);
nfs_inode_remove_request(req);
- dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
- nfs_clear_page_writeback(req);
+ nfs_unlock_request(req);
}
}

-
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