Commit a5d16a4d authored by Trond Myklebust's avatar Trond Myklebust

NFSv4: Convert LOCK rpc call into an asynchronous RPC call

 In order to allow users to interrupt/cancel it.
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 911d1aaf
......@@ -3100,11 +3100,30 @@ static const struct rpc_call_ops nfs4_locku_ops = {
.rpc_release = nfs4_locku_release_calldata,
};
static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
struct nfs_open_context *ctx,
struct nfs4_lock_state *lsp,
struct nfs_seqid *seqid)
{
struct nfs4_unlockdata *data;
struct rpc_task *task;
data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
if (data == NULL) {
nfs_free_seqid(seqid);
return ERR_PTR(-ENOMEM);
}
/* Unlock _before_ we do the RPC call */
do_vfs_lock(fl->fl_file, fl);
task = rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
if (IS_ERR(task))
nfs4_locku_release_calldata(data);
return task;
}
static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
{
struct nfs4_unlockdata *calldata;
struct inode *inode = state->inode;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs_seqid *seqid;
struct nfs4_lock_state *lsp;
struct rpc_task *task;
......@@ -3125,86 +3144,173 @@ static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *
seqid = nfs_alloc_seqid(&lsp->ls_seqid);
if (seqid == NULL)
goto out_unlock;
calldata = nfs4_alloc_unlockdata(request, request->fl_file->private_data,
lsp, seqid);
if (calldata == NULL)
goto out_free_seqid;
/* Unlock _before_ we do the RPC call */
do_vfs_lock(request->fl_file, request);
task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_locku_ops, calldata);
if (!IS_ERR(task)) {
status = nfs4_wait_for_completion_rpc_task(task);
rpc_release_task(task);
} else {
status = PTR_ERR(task);
nfs4_locku_release_calldata(calldata);
}
task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
status = PTR_ERR(task);
if (IS_ERR(task))
goto out_unlock;
status = nfs4_wait_for_completion_rpc_task(task);
rpc_release_task(task);
return status;
out_free_seqid:
nfs_free_seqid(seqid);
out_unlock:
do_vfs_lock(request->fl_file, request);
return status;
}
static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
struct nfs4_lockdata {
struct nfs_lock_args arg;
struct nfs_lock_res res;
struct nfs4_lock_state *lsp;
struct nfs_open_context *ctx;
struct file_lock fl;
int rpc_status;
int cancelled;
};
static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
{
struct inode *inode = state->inode;
struct nfs4_lockdata *p;
struct inode *inode = lsp->ls_state->inode;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
struct nfs_lock_args arg = {
.fh = NFS_FH(inode),
.fl = request,
.lock_stateid = &lsp->ls_stateid,
.open_stateid = &state->stateid,
.lock_owner = {
.clientid = server->nfs4_state->cl_clientid,
.id = lsp->ls_id,
},
.block = (IS_SETLKW(cmd)) ? 1 : 0,
.reclaim = reclaim,
};
struct nfs_lock_res res;
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (p == NULL)
return NULL;
p->arg.fh = NFS_FH(inode);
p->arg.fl = &p->fl;
p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
if (p->arg.lock_seqid == NULL)
goto out_free;
p->arg.lock_stateid = &lsp->ls_stateid;
p->arg.lock_owner.clientid = server->nfs4_state->cl_clientid;
p->arg.lock_owner.id = lsp->ls_id;
p->lsp = lsp;
atomic_inc(&lsp->ls_count);
p->ctx = get_nfs_open_context(ctx);
memcpy(&p->fl, fl, sizeof(p->fl));
return p;
out_free:
kfree(p);
return NULL;
}
static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
{
struct nfs4_lockdata *data = calldata;
struct nfs4_state *state = data->lsp->ls_state;
struct nfs4_state_owner *sp = state->owner;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
.rpc_argp = &arg,
.rpc_resp = &res,
.rpc_cred = state->owner->so_cred,
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
.rpc_argp = &data->arg,
.rpc_resp = &data->res,
.rpc_cred = sp->so_cred,
};
int status = -ENOMEM;
arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
if (arg.lock_seqid == NULL)
return -ENOMEM;
if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
struct nfs4_state_owner *owner = state->owner;
arg.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
if (arg.open_seqid == NULL)
if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
return;
dprintk("%s: begin!\n", __FUNCTION__);
/* Do we need to do an open_to_lock_owner? */
if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
if (data->arg.open_seqid == NULL) {
data->rpc_status = -ENOMEM;
task->tk_action = NULL;
goto out;
arg.new_lock_owner = 1;
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
/* increment open seqid on success, and seqid mutating errors */
if (arg.new_lock_owner != 0) {
nfs_increment_open_seqid(status, arg.open_seqid);
if (status == 0)
nfs_confirm_seqid(&lsp->ls_seqid, 0);
}
nfs_free_seqid(arg.open_seqid);
} else
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
/* increment lock seqid on success, and seqid mutating errors*/
nfs_increment_lock_seqid(status, arg.lock_seqid);
/* save the returned stateid. */
if (status == 0) {
memcpy(lsp->ls_stateid.data, res.stateid.data,
sizeof(lsp->ls_stateid.data));
lsp->ls_flags |= NFS_LOCK_INITIALIZED;
} else if (status == -NFS4ERR_DENIED)
status = -EAGAIN;
data->arg.open_stateid = &state->stateid;
data->arg.new_lock_owner = 1;
}
rpc_call_setup(task, &msg, 0);
out:
nfs_free_seqid(arg.lock_seqid);
return status;
dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
}
static void nfs4_lock_done(struct rpc_task *task, void *calldata)
{
struct nfs4_lockdata *data = calldata;
dprintk("%s: begin!\n", __FUNCTION__);
data->rpc_status = task->tk_status;
if (RPC_ASSASSINATED(task))
goto out;
if (data->arg.new_lock_owner != 0) {
nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
if (data->rpc_status == 0)
nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
else
goto out;
}
if (data->rpc_status == 0) {
memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
sizeof(data->lsp->ls_stateid.data));
data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
}
nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
out:
dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
}
static void nfs4_lock_release(void *calldata)
{
struct nfs4_lockdata *data = calldata;
dprintk("%s: begin!\n", __FUNCTION__);
if (data->arg.open_seqid != NULL)
nfs_free_seqid(data->arg.open_seqid);
if (data->cancelled != 0) {
struct rpc_task *task;
task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
data->arg.lock_seqid);
if (!IS_ERR(task))
rpc_release_task(task);
dprintk("%s: cancelling lock!\n", __FUNCTION__);
} else
nfs_free_seqid(data->arg.lock_seqid);
nfs4_put_lock_state(data->lsp);
put_nfs_open_context(data->ctx);
kfree(data);
dprintk("%s: done!\n", __FUNCTION__);
}
static const struct rpc_call_ops nfs4_lock_ops = {
.rpc_call_prepare = nfs4_lock_prepare,
.rpc_call_done = nfs4_lock_done,
.rpc_release = nfs4_lock_release,
};
static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
{
struct nfs4_lockdata *data;
struct rpc_task *task;
int ret;
dprintk("%s: begin!\n", __FUNCTION__);
data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
fl->fl_u.nfs4_fl.owner);
if (data == NULL)
return -ENOMEM;
if (IS_SETLKW(cmd))
data->arg.block = 1;
if (reclaim != 0)
data->arg.reclaim = 1;
task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
&nfs4_lock_ops, data);
if (IS_ERR(task)) {
nfs4_lock_release(data);
return PTR_ERR(task);
}
ret = nfs4_wait_for_completion_rpc_task(task);
if (ret == 0) {
ret = data->rpc_status;
if (ret == -NFS4ERR_DENIED)
ret = -EAGAIN;
} else
data->cancelled = 1;
rpc_release_task(task);
dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
return ret;
}
static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
......
......@@ -1615,12 +1615,6 @@ static int nfs4_xdr_enc_lock(struct rpc_rqst *req, uint32_t *p, struct nfs_lock_
};
int status;
status = nfs_wait_on_sequence(args->lock_seqid, req->rq_task);
if (status != 0)
goto out;
/* Do we need to do an open_to_lock_owner? */
if (args->lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)
args->new_lock_owner = 0;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_compound_hdr(&xdr, &hdr);
status = encode_putfh(&xdr, args->fh);
......
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