NFSv4: Convert LOCK rpc call into an asynchronous RPC call
In order to allow users to interrupt/cancel it.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 8571257..718fcc7 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3100,11 +3100,30 @@
.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 @@
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 inode *inode = 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 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 nfs4_lockdata *p;
+ struct inode *inode = lsp->ls_state->inode;
+ struct nfs_server *server = NFS_SERVER(inode);
+
+ 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)
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index a7b5de8..5d6bda4 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1615,12 +1615,6 @@
};
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);