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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-03-20 13:44:51 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-03-20 13:44:51 -0500
commitc42de9dd67250fe984e0e31c9b542d721af6454b (patch)
treea4079b25a044f7124837f572e5342dc7614ca75d /net/sunrpc/xprt.c
parent7d46a49f512e8d10b23353781a8ba85edd4fa640 (diff)
NFS: Fix a race in nfs_sync_inode()
Kudos to Neil Brown for spotting the problem: "in nfs_sync_inode, there is effectively the sequence: nfs_wait_on_requests nfs_flush_inode nfs_commit_inode This seems a bit racy to me as if the only requests are on the ->commit list, and nfs_commit_inode is called separately after nfs_wait_on_requests completes, and before nfs_commit_inode start (say: by nfs_write_inode) then none of these function will return >0, yet there will be some pending request that aren't waited for." The solution is to search for requests to wait upon, search for dirty requests, and search for uncommitted requests while holding the nfsi->req_lock The patch also cleans up nfs_sync_inode(), getting rid of the redundant FLUSH_WAIT flag. It turns out that we were always setting it. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/xprt.c')
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