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NFS: Fix a deadlock with lazy umount

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We can't allow rpc callback functions like task->tk_ops->rpc_call_prepare()
and task->tk_ops->rpc_call_done() to call mntput() in any way, since
that will cause a deadlock when the call to rpc_shutdown_client() attempts
to wait on 'task' to complete.

We can avoid the above deadlock by moving calls to mntput to
task->tk_ops->rpc_release() callback, since at that time the task will be
marked as completed, and so rpc_shutdown_client won't attempt to wait on
it.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2008-02-19 20:04:20 -05:00
parent 4b5621f6b1
commit 383ba71938
4 changed files with 23 additions and 8 deletions
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7
fs/nfs/read.c
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@ -73,7 +73,10 @@ static void nfs_readdata_free(struct nfs_read_data *rdata)
void nfs_readdata_release(void *data)
{
nfs_readdata_free(data);
struct nfs_read_data *rdata = data;
put_nfs_open_context(rdata->args.context);
nfs_readdata_free(rdata);
}
static
@ -186,7 +189,7 @@ static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
data->args.pgbase = req->wb_pgbase + offset;
data->args.pages = data->pagevec;
data->args.count = count;
data->args.context = req->wb_context;
data->args.context = get_nfs_open_context(req->wb_context);
data->res.fattr = &data->fattr;
data->res.count = count;