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authorTrond Myklebust <Trond.Myklebust@netapp.com>2008-02-19 20:04:20 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-02-25 21:40:33 -0800
commit383ba71938519959be8e0b598ec658f0c211ff45 (patch)
tree01eb0155676fe69d40f01dc137ea3be952d88997 /fs/nfs/read.c
parent4b5621f6b127bce9218998c187bd25bf7f9fc371 (diff)
downloadlinux-383ba71938519959be8e0b598ec658f0c211ff45.tar.bz2
NFS: Fix a deadlock with lazy umount
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>
Diffstat (limited to 'fs/nfs/read.c')
-rw-r--r--fs/nfs/read.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 3d7d9631e125..fab0d3720a03 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -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;