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nfs: fix race in nfs_dirty_request 

When called from nfs_flush_incompatible, the req is not locked, so
req->wb_page might be set to NULL before it is used by PageWriteback.

Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman 2008-05-01 20:03:22 +03:00 committed by Trond Myklebust
parent b0b539739f
commit 38def50fab
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/write.c
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@ -415,7 +415,7 @@ nfs_dirty_request(struct nfs_page *req)
if (page == NULL || test_bit(PG_NEED_COMMIT, &req->wb_flags))
return 0;
return !PageWriteback(req->wb_page);
return !PageWriteback(page);
}
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)