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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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5
fs/nfs/direct.c
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@ -323,7 +323,7 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq,
data->inode = inode;
data->cred = msg.rpc_cred;
data->args.fh = NFS_FH(inode);
data->args.context = ctx;
data->args.context = get_nfs_open_context(ctx);
data->args.offset = pos;
data->args.pgbase = pgbase;
data->args.pages = data->pagevec;
@ -546,6 +546,7 @@ static void nfs_direct_commit_schedule(struct nfs_direct_req *dreq)
data->args.fh = NFS_FH(data->inode);
data->args.offset = 0;
data->args.count = 0;
data->args.context = get_nfs_open_context(dreq->ctx);
data->res.count = 0;
data->res.fattr = &data->fattr;
data->res.verf = &data->verf;
@ -728,7 +729,7 @@ static ssize_t nfs_direct_write_schedule_segment(struct nfs_direct_req *dreq,
data->inode = inode;
data->cred = msg.rpc_cred;
data->args.fh = NFS_FH(inode);
data->args.context = ctx;
data->args.context = get_nfs_open_context(ctx);
data->args.offset = pos;
data->args.pgbase = pgbase;
data->args.pages = data->pagevec;

6
fs/nfs/inode.c
View File

@ -521,8 +521,12 @@ struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
static void __put_nfs_open_context(struct nfs_open_context *ctx, int wait)
{
struct inode *inode = ctx->path.dentry->d_inode;
struct inode *inode;
if (ctx == NULL)
return;
inode = ctx->path.dentry->d_inode;
if (!atomic_dec_and_lock(&ctx->count, &inode->i_lock))
return;
list_del(&ctx->list);

7
fs/nfs/read.c
View File

@ -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;

13
fs/nfs/write.c
View File

@ -105,8 +105,11 @@ static void nfs_writedata_free(struct nfs_write_data *wdata)
call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free);
}
void nfs_writedata_release(void *wdata)
void nfs_writedata_release(void *data)
{
struct nfs_write_data *wdata = data;
put_nfs_open_context(wdata->args.context);
nfs_writedata_free(wdata);
}
@ -816,7 +819,7 @@ static void nfs_write_rpcsetup(struct nfs_page *req,
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->args.stable = NFS_UNSTABLE;
if (how & FLUSH_STABLE) {
data->args.stable = NFS_DATA_SYNC;
@ -1153,8 +1156,11 @@ int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
void nfs_commit_release(void *wdata)
void nfs_commit_release(void *data)
{
struct nfs_write_data *wdata = data;
put_nfs_open_context(wdata->args.context);
nfs_commit_free(wdata);
}
@ -1197,6 +1203,7 @@ static void nfs_commit_rpcsetup(struct list_head *head,
/* Note: we always request a commit of the entire inode */
data->args.offset = 0;
data->args.count = 0;
data->args.context = get_nfs_open_context(first->wb_context);
data->res.count = 0;
data->res.fattr = &data->fattr;
data->res.verf = &data->verf;