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-rw-r--r--fs/nfs/nfs42proc.c1443
1 files changed, 1443 insertions, 0 deletions
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
new file mode 100644
index 000000000..5a8fe0e57
--- /dev/null
+++ b/fs/nfs/nfs42proc.c
@@ -0,0 +1,1443 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
+ */
+#include <linux/fs.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/nfs.h>
+#include <linux/nfs3.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_xdr.h>
+#include <linux/nfs_fs.h>
+#include "nfs4_fs.h"
+#include "nfs42.h"
+#include "iostat.h"
+#include "pnfs.h"
+#include "nfs4session.h"
+#include "internal.h"
+#include "delegation.h"
+#include "nfs4trace.h"
+
+#define NFSDBG_FACILITY NFSDBG_PROC
+static int nfs42_do_offload_cancel_async(struct file *dst, nfs4_stateid *std);
+
+static void nfs42_set_netaddr(struct file *filep, struct nfs42_netaddr *naddr)
+{
+ struct nfs_client *clp = (NFS_SERVER(file_inode(filep)))->nfs_client;
+ unsigned short port = 2049;
+
+ rcu_read_lock();
+ naddr->netid_len = scnprintf(naddr->netid,
+ sizeof(naddr->netid), "%s",
+ rpc_peeraddr2str(clp->cl_rpcclient,
+ RPC_DISPLAY_NETID));
+ naddr->addr_len = scnprintf(naddr->addr,
+ sizeof(naddr->addr),
+ "%s.%u.%u",
+ rpc_peeraddr2str(clp->cl_rpcclient,
+ RPC_DISPLAY_ADDR),
+ port >> 8, port & 255);
+ rcu_read_unlock();
+}
+
+static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
+ struct nfs_lock_context *lock, loff_t offset, loff_t len)
+{
+ struct inode *inode = file_inode(filep);
+ struct nfs_server *server = NFS_SERVER(inode);
+ u32 bitmask[NFS_BITMASK_SZ];
+ struct nfs42_falloc_args args = {
+ .falloc_fh = NFS_FH(inode),
+ .falloc_offset = offset,
+ .falloc_length = len,
+ .falloc_bitmask = bitmask,
+ };
+ struct nfs42_falloc_res res = {
+ .falloc_server = server,
+ };
+ int status;
+
+ msg->rpc_argp = &args;
+ msg->rpc_resp = &res;
+
+ status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
+ lock, FMODE_WRITE);
+ if (status) {
+ if (status == -EAGAIN)
+ status = -NFS4ERR_BAD_STATEID;
+ return status;
+ }
+
+ nfs4_bitmask_set(bitmask, server->cache_consistency_bitmask, inode,
+ NFS_INO_INVALID_BLOCKS);
+
+ res.falloc_fattr = nfs_alloc_fattr();
+ if (!res.falloc_fattr)
+ return -ENOMEM;
+
+ status = nfs4_call_sync(server->client, server, msg,
+ &args.seq_args, &res.seq_res, 0);
+ if (status == 0) {
+ if (nfs_should_remove_suid(inode)) {
+ spin_lock(&inode->i_lock);
+ nfs_set_cache_invalid(inode,
+ NFS_INO_REVAL_FORCED | NFS_INO_INVALID_MODE);
+ spin_unlock(&inode->i_lock);
+ }
+ status = nfs_post_op_update_inode_force_wcc(inode,
+ res.falloc_fattr);
+ }
+ if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE])
+ trace_nfs4_fallocate(inode, &args, status);
+ else
+ trace_nfs4_deallocate(inode, &args, status);
+ kfree(res.falloc_fattr);
+ return status;
+}
+
+static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
+ loff_t offset, loff_t len)
+{
+ struct inode *inode = file_inode(filep);
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs4_exception exception = { };
+ struct nfs_lock_context *lock;
+ int err;
+
+ lock = nfs_get_lock_context(nfs_file_open_context(filep));
+ if (IS_ERR(lock))
+ return PTR_ERR(lock);
+
+ exception.inode = inode;
+ exception.state = lock->open_context->state;
+
+ err = nfs_sync_inode(inode);
+ if (err)
+ goto out;
+
+ do {
+ err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
+ if (err == -ENOTSUPP) {
+ err = -EOPNOTSUPP;
+ break;
+ }
+ err = nfs4_handle_exception(server, err, &exception);
+ } while (exception.retry);
+out:
+ nfs_put_lock_context(lock);
+ return err;
+}
+
+int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
+ };
+ struct inode *inode = file_inode(filep);
+ int err;
+
+ if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
+ return -EOPNOTSUPP;
+
+ inode_lock(inode);
+
+ err = nfs42_proc_fallocate(&msg, filep, offset, len);
+ if (err == -EOPNOTSUPP)
+ NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
+
+ inode_unlock(inode);
+ return err;
+}
+
+int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
+ };
+ struct inode *inode = file_inode(filep);
+ int err;
+
+ if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
+ return -EOPNOTSUPP;
+
+ inode_lock(inode);
+
+ err = nfs42_proc_fallocate(&msg, filep, offset, len);
+ if (err == 0)
+ truncate_pagecache_range(inode, offset, (offset + len) -1);
+ if (err == -EOPNOTSUPP)
+ NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
+
+ inode_unlock(inode);
+ return err;
+}
+
+static int handle_async_copy(struct nfs42_copy_res *res,
+ struct nfs_server *dst_server,
+ struct nfs_server *src_server,
+ struct file *src,
+ struct file *dst,
+ nfs4_stateid *src_stateid,
+ bool *restart)
+{
+ struct nfs4_copy_state *copy, *tmp_copy = NULL, *iter;
+ int status = NFS4_OK;
+ struct nfs_open_context *dst_ctx = nfs_file_open_context(dst);
+ struct nfs_open_context *src_ctx = nfs_file_open_context(src);
+
+ copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_KERNEL);
+ if (!copy)
+ return -ENOMEM;
+
+ spin_lock(&dst_server->nfs_client->cl_lock);
+ list_for_each_entry(iter,
+ &dst_server->nfs_client->pending_cb_stateids,
+ copies) {
+ if (memcmp(&res->write_res.stateid, &iter->stateid,
+ NFS4_STATEID_SIZE))
+ continue;
+ tmp_copy = iter;
+ list_del(&iter->copies);
+ break;
+ }
+ if (tmp_copy) {
+ spin_unlock(&dst_server->nfs_client->cl_lock);
+ kfree(copy);
+ copy = tmp_copy;
+ goto out;
+ }
+
+ memcpy(&copy->stateid, &res->write_res.stateid, NFS4_STATEID_SIZE);
+ init_completion(&copy->completion);
+ copy->parent_dst_state = dst_ctx->state;
+ copy->parent_src_state = src_ctx->state;
+
+ list_add_tail(&copy->copies, &dst_server->ss_copies);
+ spin_unlock(&dst_server->nfs_client->cl_lock);
+
+ if (dst_server != src_server) {
+ spin_lock(&src_server->nfs_client->cl_lock);
+ list_add_tail(&copy->src_copies, &src_server->ss_copies);
+ spin_unlock(&src_server->nfs_client->cl_lock);
+ }
+
+ status = wait_for_completion_interruptible(&copy->completion);
+ spin_lock(&dst_server->nfs_client->cl_lock);
+ list_del_init(&copy->copies);
+ spin_unlock(&dst_server->nfs_client->cl_lock);
+ if (dst_server != src_server) {
+ spin_lock(&src_server->nfs_client->cl_lock);
+ list_del_init(&copy->src_copies);
+ spin_unlock(&src_server->nfs_client->cl_lock);
+ }
+ if (status == -ERESTARTSYS) {
+ goto out_cancel;
+ } else if (copy->flags || copy->error == NFS4ERR_PARTNER_NO_AUTH) {
+ status = -EAGAIN;
+ *restart = true;
+ goto out_cancel;
+ }
+out:
+ res->write_res.count = copy->count;
+ memcpy(&res->write_res.verifier, &copy->verf, sizeof(copy->verf));
+ status = -copy->error;
+
+out_free:
+ kfree(copy);
+ return status;
+out_cancel:
+ nfs42_do_offload_cancel_async(dst, &copy->stateid);
+ if (!nfs42_files_from_same_server(src, dst))
+ nfs42_do_offload_cancel_async(src, src_stateid);
+ goto out_free;
+}
+
+static int process_copy_commit(struct file *dst, loff_t pos_dst,
+ struct nfs42_copy_res *res)
+{
+ struct nfs_commitres cres;
+ int status = -ENOMEM;
+
+ cres.verf = kzalloc(sizeof(struct nfs_writeverf), GFP_KERNEL);
+ if (!cres.verf)
+ goto out;
+
+ status = nfs4_proc_commit(dst, pos_dst, res->write_res.count, &cres);
+ if (status)
+ goto out_free;
+ if (nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
+ &cres.verf->verifier)) {
+ dprintk("commit verf differs from copy verf\n");
+ status = -EAGAIN;
+ }
+out_free:
+ kfree(cres.verf);
+out:
+ return status;
+}
+
+/**
+ * nfs42_copy_dest_done - perform inode cache updates after clone/copy offload
+ * @inode: pointer to destination inode
+ * @pos: destination offset
+ * @len: copy length
+ *
+ * Punch a hole in the inode page cache, so that the NFS client will
+ * know to retrieve new data.
+ * Update the file size if necessary, and then mark the inode as having
+ * invalid cached values for change attribute, ctime, mtime and space used.
+ */
+static void nfs42_copy_dest_done(struct inode *inode, loff_t pos, loff_t len)
+{
+ loff_t newsize = pos + len;
+ loff_t end = newsize - 1;
+
+ WARN_ON_ONCE(invalidate_inode_pages2_range(inode->i_mapping,
+ pos >> PAGE_SHIFT, end >> PAGE_SHIFT));
+
+ spin_lock(&inode->i_lock);
+ if (newsize > i_size_read(inode))
+ i_size_write(inode, newsize);
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
+ NFS_INO_INVALID_CTIME |
+ NFS_INO_INVALID_MTIME |
+ NFS_INO_INVALID_BLOCKS);
+ spin_unlock(&inode->i_lock);
+}
+
+static ssize_t _nfs42_proc_copy(struct file *src,
+ struct nfs_lock_context *src_lock,
+ struct file *dst,
+ struct nfs_lock_context *dst_lock,
+ struct nfs42_copy_args *args,
+ struct nfs42_copy_res *res,
+ struct nl4_server *nss,
+ nfs4_stateid *cnr_stateid,
+ bool *restart)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
+ .rpc_argp = args,
+ .rpc_resp = res,
+ };
+ struct inode *dst_inode = file_inode(dst);
+ struct inode *src_inode = file_inode(src);
+ struct nfs_server *dst_server = NFS_SERVER(dst_inode);
+ struct nfs_server *src_server = NFS_SERVER(src_inode);
+ loff_t pos_src = args->src_pos;
+ loff_t pos_dst = args->dst_pos;
+ size_t count = args->count;
+ ssize_t status;
+
+ if (nss) {
+ args->cp_src = nss;
+ nfs4_stateid_copy(&args->src_stateid, cnr_stateid);
+ } else {
+ status = nfs4_set_rw_stateid(&args->src_stateid,
+ src_lock->open_context, src_lock, FMODE_READ);
+ if (status) {
+ if (status == -EAGAIN)
+ status = -NFS4ERR_BAD_STATEID;
+ return status;
+ }
+ }
+ status = nfs_filemap_write_and_wait_range(src->f_mapping,
+ pos_src, pos_src + (loff_t)count - 1);
+ if (status)
+ return status;
+
+ status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context,
+ dst_lock, FMODE_WRITE);
+ if (status) {
+ if (status == -EAGAIN)
+ status = -NFS4ERR_BAD_STATEID;
+ return status;
+ }
+
+ status = nfs_sync_inode(dst_inode);
+ if (status)
+ return status;
+
+ res->commit_res.verf = NULL;
+ if (args->sync) {
+ res->commit_res.verf =
+ kzalloc(sizeof(struct nfs_writeverf), GFP_KERNEL);
+ if (!res->commit_res.verf)
+ return -ENOMEM;
+ }
+ set_bit(NFS_CLNT_SRC_SSC_COPY_STATE,
+ &src_lock->open_context->state->flags);
+ set_bit(NFS_CLNT_DST_SSC_COPY_STATE,
+ &dst_lock->open_context->state->flags);
+
+ status = nfs4_call_sync(dst_server->client, dst_server, &msg,
+ &args->seq_args, &res->seq_res, 0);
+ trace_nfs4_copy(src_inode, dst_inode, args, res, nss, status);
+ if (status == -ENOTSUPP)
+ dst_server->caps &= ~NFS_CAP_COPY;
+ if (status)
+ goto out;
+
+ if (args->sync &&
+ nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
+ &res->commit_res.verf->verifier)) {
+ status = -EAGAIN;
+ goto out;
+ }
+
+ if (!res->synchronous) {
+ status = handle_async_copy(res, dst_server, src_server, src,
+ dst, &args->src_stateid, restart);
+ if (status)
+ goto out;
+ }
+
+ if ((!res->synchronous || !args->sync) &&
+ res->write_res.verifier.committed != NFS_FILE_SYNC) {
+ status = process_copy_commit(dst, pos_dst, res);
+ if (status)
+ goto out;
+ }
+
+ nfs42_copy_dest_done(dst_inode, pos_dst, res->write_res.count);
+ nfs_invalidate_atime(src_inode);
+ status = res->write_res.count;
+out:
+ if (args->sync)
+ kfree(res->commit_res.verf);
+ return status;
+}
+
+ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
+ struct file *dst, loff_t pos_dst, size_t count,
+ struct nl4_server *nss,
+ nfs4_stateid *cnr_stateid, bool sync)
+{
+ struct nfs_server *server = NFS_SERVER(file_inode(dst));
+ struct nfs_lock_context *src_lock;
+ struct nfs_lock_context *dst_lock;
+ struct nfs42_copy_args args = {
+ .src_fh = NFS_FH(file_inode(src)),
+ .src_pos = pos_src,
+ .dst_fh = NFS_FH(file_inode(dst)),
+ .dst_pos = pos_dst,
+ .count = count,
+ .sync = sync,
+ };
+ struct nfs42_copy_res res;
+ struct nfs4_exception src_exception = {
+ .inode = file_inode(src),
+ .stateid = &args.src_stateid,
+ };
+ struct nfs4_exception dst_exception = {
+ .inode = file_inode(dst),
+ .stateid = &args.dst_stateid,
+ };
+ ssize_t err, err2;
+ bool restart = false;
+
+ src_lock = nfs_get_lock_context(nfs_file_open_context(src));
+ if (IS_ERR(src_lock))
+ return PTR_ERR(src_lock);
+
+ src_exception.state = src_lock->open_context->state;
+
+ dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
+ if (IS_ERR(dst_lock)) {
+ err = PTR_ERR(dst_lock);
+ goto out_put_src_lock;
+ }
+
+ dst_exception.state = dst_lock->open_context->state;
+
+ do {
+ inode_lock(file_inode(dst));
+ err = _nfs42_proc_copy(src, src_lock,
+ dst, dst_lock,
+ &args, &res,
+ nss, cnr_stateid, &restart);
+ inode_unlock(file_inode(dst));
+
+ if (err >= 0)
+ break;
+ if (err == -ENOTSUPP &&
+ nfs42_files_from_same_server(src, dst)) {
+ err = -EOPNOTSUPP;
+ break;
+ } else if (err == -EAGAIN) {
+ if (!restart) {
+ dst_exception.retry = 1;
+ continue;
+ }
+ break;
+ } else if (err == -NFS4ERR_OFFLOAD_NO_REQS &&
+ args.sync != res.synchronous) {
+ args.sync = res.synchronous;
+ dst_exception.retry = 1;
+ continue;
+ } else if ((err == -ESTALE ||
+ err == -NFS4ERR_OFFLOAD_DENIED ||
+ err == -ENOTSUPP) &&
+ !nfs42_files_from_same_server(src, dst)) {
+ nfs42_do_offload_cancel_async(src, &args.src_stateid);
+ err = -EOPNOTSUPP;
+ break;
+ }
+
+ err2 = nfs4_handle_exception(server, err, &src_exception);
+ err = nfs4_handle_exception(server, err, &dst_exception);
+ if (!err)
+ err = err2;
+ } while (src_exception.retry || dst_exception.retry);
+
+ nfs_put_lock_context(dst_lock);
+out_put_src_lock:
+ nfs_put_lock_context(src_lock);
+ return err;
+}
+
+struct nfs42_offloadcancel_data {
+ struct nfs_server *seq_server;
+ struct nfs42_offload_status_args args;
+ struct nfs42_offload_status_res res;
+};
+
+static void nfs42_offload_cancel_prepare(struct rpc_task *task, void *calldata)
+{
+ struct nfs42_offloadcancel_data *data = calldata;
+
+ nfs4_setup_sequence(data->seq_server->nfs_client,
+ &data->args.osa_seq_args,
+ &data->res.osr_seq_res, task);
+}
+
+static void nfs42_offload_cancel_done(struct rpc_task *task, void *calldata)
+{
+ struct nfs42_offloadcancel_data *data = calldata;
+
+ trace_nfs4_offload_cancel(&data->args, task->tk_status);
+ nfs41_sequence_done(task, &data->res.osr_seq_res);
+ if (task->tk_status &&
+ nfs4_async_handle_error(task, data->seq_server, NULL,
+ NULL) == -EAGAIN)
+ rpc_restart_call_prepare(task);
+}
+
+static void nfs42_free_offloadcancel_data(void *data)
+{
+ kfree(data);
+}
+
+static const struct rpc_call_ops nfs42_offload_cancel_ops = {
+ .rpc_call_prepare = nfs42_offload_cancel_prepare,
+ .rpc_call_done = nfs42_offload_cancel_done,
+ .rpc_release = nfs42_free_offloadcancel_data,
+};
+
+static int nfs42_do_offload_cancel_async(struct file *dst,
+ nfs4_stateid *stateid)
+{
+ struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
+ struct nfs42_offloadcancel_data *data = NULL;
+ struct nfs_open_context *ctx = nfs_file_open_context(dst);
+ struct rpc_task *task;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OFFLOAD_CANCEL],
+ .rpc_cred = ctx->cred,
+ };
+ struct rpc_task_setup task_setup_data = {
+ .rpc_client = dst_server->client,
+ .rpc_message = &msg,
+ .callback_ops = &nfs42_offload_cancel_ops,
+ .workqueue = nfsiod_workqueue,
+ .flags = RPC_TASK_ASYNC,
+ };
+ int status;
+
+ if (!(dst_server->caps & NFS_CAP_OFFLOAD_CANCEL))
+ return -EOPNOTSUPP;
+
+ data = kzalloc(sizeof(struct nfs42_offloadcancel_data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+
+ data->seq_server = dst_server;
+ data->args.osa_src_fh = NFS_FH(file_inode(dst));
+ memcpy(&data->args.osa_stateid, stateid,
+ sizeof(data->args.osa_stateid));
+ msg.rpc_argp = &data->args;
+ msg.rpc_resp = &data->res;
+ task_setup_data.callback_data = data;
+ nfs4_init_sequence(&data->args.osa_seq_args, &data->res.osr_seq_res,
+ 1, 0);
+ task = rpc_run_task(&task_setup_data);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ status = rpc_wait_for_completion_task(task);
+ if (status == -ENOTSUPP)
+ dst_server->caps &= ~NFS_CAP_OFFLOAD_CANCEL;
+ rpc_put_task(task);
+ return status;
+}
+
+static int _nfs42_proc_copy_notify(struct file *src, struct file *dst,
+ struct nfs42_copy_notify_args *args,
+ struct nfs42_copy_notify_res *res)
+{
+ struct nfs_server *src_server = NFS_SERVER(file_inode(src));
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY_NOTIFY],
+ .rpc_argp = args,
+ .rpc_resp = res,
+ };
+ int status;
+ struct nfs_open_context *ctx;
+ struct nfs_lock_context *l_ctx;
+
+ ctx = get_nfs_open_context(nfs_file_open_context(src));
+ l_ctx = nfs_get_lock_context(ctx);
+ if (IS_ERR(l_ctx)) {
+ status = PTR_ERR(l_ctx);
+ goto out;
+ }
+
+ status = nfs4_set_rw_stateid(&args->cna_src_stateid, ctx, l_ctx,
+ FMODE_READ);
+ nfs_put_lock_context(l_ctx);
+ if (status) {
+ if (status == -EAGAIN)
+ status = -NFS4ERR_BAD_STATEID;
+ goto out;
+ }
+
+ status = nfs4_call_sync(src_server->client, src_server, &msg,
+ &args->cna_seq_args, &res->cnr_seq_res, 0);
+ trace_nfs4_copy_notify(file_inode(src), args, res, status);
+ if (status == -ENOTSUPP)
+ src_server->caps &= ~NFS_CAP_COPY_NOTIFY;
+
+out:
+ put_nfs_open_context(nfs_file_open_context(src));
+ return status;
+}
+
+int nfs42_proc_copy_notify(struct file *src, struct file *dst,
+ struct nfs42_copy_notify_res *res)
+{
+ struct nfs_server *src_server = NFS_SERVER(file_inode(src));
+ struct nfs42_copy_notify_args *args;
+ struct nfs4_exception exception = {
+ .inode = file_inode(src),
+ };
+ int status;
+
+ if (!(src_server->caps & NFS_CAP_COPY_NOTIFY))
+ return -EOPNOTSUPP;
+
+ args = kzalloc(sizeof(struct nfs42_copy_notify_args), GFP_KERNEL);
+ if (args == NULL)
+ return -ENOMEM;
+
+ args->cna_src_fh = NFS_FH(file_inode(src)),
+ args->cna_dst.nl4_type = NL4_NETADDR;
+ nfs42_set_netaddr(dst, &args->cna_dst.u.nl4_addr);
+ exception.stateid = &args->cna_src_stateid;
+
+ do {
+ status = _nfs42_proc_copy_notify(src, dst, args, res);
+ if (status == -ENOTSUPP) {
+ status = -EOPNOTSUPP;
+ goto out;
+ }
+ status = nfs4_handle_exception(src_server, status, &exception);
+ } while (exception.retry);
+
+out:
+ kfree(args);
+ return status;
+}
+
+static loff_t _nfs42_proc_llseek(struct file *filep,
+ struct nfs_lock_context *lock, loff_t offset, int whence)
+{
+ struct inode *inode = file_inode(filep);
+ struct nfs42_seek_args args = {
+ .sa_fh = NFS_FH(inode),
+ .sa_offset = offset,
+ .sa_what = (whence == SEEK_HOLE) ?
+ NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
+ };
+ struct nfs42_seek_res res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ struct nfs_server *server = NFS_SERVER(inode);
+ int status;
+
+ if (!nfs_server_capable(inode, NFS_CAP_SEEK))
+ return -ENOTSUPP;
+
+ status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
+ lock, FMODE_READ);
+ if (status) {
+ if (status == -EAGAIN)
+ status = -NFS4ERR_BAD_STATEID;
+ return status;
+ }
+
+ status = nfs_filemap_write_and_wait_range(inode->i_mapping,
+ offset, LLONG_MAX);
+ if (status)
+ return status;
+
+ status = nfs4_call_sync(server->client, server, &msg,
+ &args.seq_args, &res.seq_res, 0);
+ trace_nfs4_llseek(inode, &args, &res, status);
+ if (status == -ENOTSUPP)
+ server->caps &= ~NFS_CAP_SEEK;
+ if (status)
+ return status;
+
+ if (whence == SEEK_DATA && res.sr_eof)
+ return -NFS4ERR_NXIO;
+ else
+ return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
+}
+
+loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
+{
+ struct nfs_server *server = NFS_SERVER(file_inode(filep));
+ struct nfs4_exception exception = { };
+ struct nfs_lock_context *lock;
+ loff_t err;
+
+ lock = nfs_get_lock_context(nfs_file_open_context(filep));
+ if (IS_ERR(lock))
+ return PTR_ERR(lock);
+
+ exception.inode = file_inode(filep);
+ exception.state = lock->open_context->state;
+
+ do {
+ err = _nfs42_proc_llseek(filep, lock, offset, whence);
+ if (err >= 0)
+ break;
+ if (err == -ENOTSUPP) {
+ err = -EOPNOTSUPP;
+ break;
+ }
+ err = nfs4_handle_exception(server, err, &exception);
+ } while (exception.retry);
+
+ nfs_put_lock_context(lock);
+ return err;
+}
+
+
+static void
+nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
+{
+ struct nfs42_layoutstat_data *data = calldata;
+ struct inode *inode = data->inode;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct pnfs_layout_hdr *lo;
+
+ spin_lock(&inode->i_lock);
+ lo = NFS_I(inode)->layout;
+ if (!pnfs_layout_is_valid(lo)) {
+ spin_unlock(&inode->i_lock);
+ rpc_exit(task, 0);
+ return;
+ }
+ nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
+ spin_unlock(&inode->i_lock);
+ nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
+ &data->res.seq_res, task);
+}
+
+static void
+nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
+{
+ struct nfs42_layoutstat_data *data = calldata;
+ struct inode *inode = data->inode;
+ struct pnfs_layout_hdr *lo;
+
+ if (!nfs4_sequence_done(task, &data->res.seq_res))
+ return;
+
+ switch (task->tk_status) {
+ case 0:
+ return;
+ case -NFS4ERR_BADHANDLE:
+ case -ESTALE:
+ pnfs_destroy_layout(NFS_I(inode));
+ break;
+ case -NFS4ERR_EXPIRED:
+ case -NFS4ERR_ADMIN_REVOKED:
+ case -NFS4ERR_DELEG_REVOKED:
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_BAD_STATEID:
+ spin_lock(&inode->i_lock);
+ lo = NFS_I(inode)->layout;
+ if (pnfs_layout_is_valid(lo) &&
+ nfs4_stateid_match(&data->args.stateid,
+ &lo->plh_stateid)) {
+ LIST_HEAD(head);
+
+ /*
+ * Mark the bad layout state as invalid, then retry
+ * with the current stateid.
+ */
+ pnfs_mark_layout_stateid_invalid(lo, &head);
+ spin_unlock(&inode->i_lock);
+ pnfs_free_lseg_list(&head);
+ nfs_commit_inode(inode, 0);
+ } else
+ spin_unlock(&inode->i_lock);
+ break;
+ case -NFS4ERR_OLD_STATEID:
+ spin_lock(&inode->i_lock);
+ lo = NFS_I(inode)->layout;
+ if (pnfs_layout_is_valid(lo) &&
+ nfs4_stateid_match_other(&data->args.stateid,
+ &lo->plh_stateid)) {
+ /* Do we need to delay before resending? */
+ if (!nfs4_stateid_is_newer(&lo->plh_stateid,
+ &data->args.stateid))
+ rpc_delay(task, HZ);
+ rpc_restart_call_prepare(task);
+ }
+ spin_unlock(&inode->i_lock);
+ break;
+ case -ENOTSUPP:
+ case -EOPNOTSUPP:
+ NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
+ }
+
+ trace_nfs4_layoutstats(inode, &data->args.stateid, task->tk_status);
+}
+
+static void
+nfs42_layoutstat_release(void *calldata)
+{
+ struct nfs42_layoutstat_data *data = calldata;
+ struct nfs42_layoutstat_devinfo *devinfo = data->args.devinfo;
+ int i;
+
+ for (i = 0; i < data->args.num_dev; i++) {
+ if (devinfo[i].ld_private.ops && devinfo[i].ld_private.ops->free)
+ devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
+ }
+
+ pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
+ smp_mb__before_atomic();
+ clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
+ smp_mb__after_atomic();
+ nfs_iput_and_deactive(data->inode);
+ kfree(data->args.devinfo);
+ kfree(data);
+}
+
+static const struct rpc_call_ops nfs42_layoutstat_ops = {
+ .rpc_call_prepare = nfs42_layoutstat_prepare,
+ .rpc_call_done = nfs42_layoutstat_done,
+ .rpc_release = nfs42_layoutstat_release,
+};
+
+int nfs42_proc_layoutstats_generic(struct nfs_server *server,
+ struct nfs42_layoutstat_data *data)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
+ .rpc_argp = &data->args,
+ .rpc_resp = &data->res,
+ };
+ struct rpc_task_setup task_setup = {
+ .rpc_client = server->client,
+ .rpc_message = &msg,
+ .callback_ops = &nfs42_layoutstat_ops,
+ .callback_data = data,
+ .flags = RPC_TASK_ASYNC,
+ };
+ struct rpc_task *task;
+
+ data->inode = nfs_igrab_and_active(data->args.inode);
+ if (!data->inode) {
+ nfs42_layoutstat_release(data);
+ return -EAGAIN;
+ }
+ nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
+ task = rpc_run_task(&task_setup);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ rpc_put_task(task);
+ return 0;
+}
+
+static struct nfs42_layouterror_data *
+nfs42_alloc_layouterror_data(struct pnfs_layout_segment *lseg, gfp_t gfp_flags)
+{
+ struct nfs42_layouterror_data *data;
+ struct inode *inode = lseg->pls_layout->plh_inode;
+
+ data = kzalloc(sizeof(*data), gfp_flags);
+ if (data) {
+ data->args.inode = data->inode = nfs_igrab_and_active(inode);
+ if (data->inode) {
+ data->lseg = pnfs_get_lseg(lseg);
+ if (data->lseg)
+ return data;
+ nfs_iput_and_deactive(data->inode);
+ }
+ kfree(data);
+ }
+ return NULL;
+}
+
+static void
+nfs42_free_layouterror_data(struct nfs42_layouterror_data *data)
+{
+ pnfs_put_lseg(data->lseg);
+ nfs_iput_and_deactive(data->inode);
+ kfree(data);
+}
+
+static void
+nfs42_layouterror_prepare(struct rpc_task *task, void *calldata)
+{
+ struct nfs42_layouterror_data *data = calldata;
+ struct inode *inode = data->inode;
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct pnfs_layout_hdr *lo = data->lseg->pls_layout;
+ unsigned i;
+
+ spin_lock(&inode->i_lock);
+ if (!pnfs_layout_is_valid(lo)) {
+ spin_unlock(&inode->i_lock);
+ rpc_exit(task, 0);
+ return;
+ }
+ for (i = 0; i < data->args.num_errors; i++)
+ nfs4_stateid_copy(&data->args.errors[i].stateid,
+ &lo->plh_stateid);
+ spin_unlock(&inode->i_lock);
+ nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
+ &data->res.seq_res, task);
+}
+
+static void
+nfs42_layouterror_done(struct rpc_task *task, void *calldata)
+{
+ struct nfs42_layouterror_data *data = calldata;
+ struct inode *inode = data->inode;
+ struct pnfs_layout_hdr *lo = data->lseg->pls_layout;
+
+ if (!nfs4_sequence_done(task, &data->res.seq_res))
+ return;
+
+ switch (task->tk_status) {
+ case 0:
+ return;
+ case -NFS4ERR_BADHANDLE:
+ case -ESTALE:
+ pnfs_destroy_layout(NFS_I(inode));
+ break;
+ case -NFS4ERR_EXPIRED:
+ case -NFS4ERR_ADMIN_REVOKED:
+ case -NFS4ERR_DELEG_REVOKED:
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_BAD_STATEID:
+ spin_lock(&inode->i_lock);
+ if (pnfs_layout_is_valid(lo) &&
+ nfs4_stateid_match(&data->args.errors[0].stateid,
+ &lo->plh_stateid)) {
+ LIST_HEAD(head);
+
+ /*
+ * Mark the bad layout state as invalid, then retry
+ * with the current stateid.
+ */
+ pnfs_mark_layout_stateid_invalid(lo, &head);
+ spin_unlock(&inode->i_lock);
+ pnfs_free_lseg_list(&head);
+ nfs_commit_inode(inode, 0);
+ } else
+ spin_unlock(&inode->i_lock);
+ break;
+ case -NFS4ERR_OLD_STATEID:
+ spin_lock(&inode->i_lock);
+ if (pnfs_layout_is_valid(lo) &&
+ nfs4_stateid_match_other(&data->args.errors[0].stateid,
+ &lo->plh_stateid)) {
+ /* Do we need to delay before resending? */
+ if (!nfs4_stateid_is_newer(&lo->plh_stateid,
+ &data->args.errors[0].stateid))
+ rpc_delay(task, HZ);
+ rpc_restart_call_prepare(task);
+ }
+ spin_unlock(&inode->i_lock);
+ break;
+ case -ENOTSUPP:
+ case -EOPNOTSUPP:
+ NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTERROR;
+ }
+
+ trace_nfs4_layouterror(inode, &data->args.errors[0].stateid,
+ task->tk_status);
+}
+
+static void
+nfs42_layouterror_release(void *calldata)
+{
+ struct nfs42_layouterror_data *data = calldata;
+
+ nfs42_free_layouterror_data(data);
+}
+
+static const struct rpc_call_ops nfs42_layouterror_ops = {
+ .rpc_call_prepare = nfs42_layouterror_prepare,
+ .rpc_call_done = nfs42_layouterror_done,
+ .rpc_release = nfs42_layouterror_release,
+};
+
+int nfs42_proc_layouterror(struct pnfs_layout_segment *lseg,
+ const struct nfs42_layout_error *errors, size_t n)
+{
+ struct inode *inode = lseg->pls_layout->plh_inode;
+ struct nfs42_layouterror_data *data;
+ struct rpc_task *task;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTERROR],
+ };
+ struct rpc_task_setup task_setup = {
+ .rpc_message = &msg,
+ .callback_ops = &nfs42_layouterror_ops,
+ .flags = RPC_TASK_ASYNC,
+ };
+ unsigned int i;
+
+ if (!nfs_server_capable(inode, NFS_CAP_LAYOUTERROR))
+ return -EOPNOTSUPP;
+ if (n > NFS42_LAYOUTERROR_MAX)
+ return -EINVAL;
+ data = nfs42_alloc_layouterror_data(lseg, nfs_io_gfp_mask());
+ if (!data)
+ return -ENOMEM;
+ for (i = 0; i < n; i++) {
+ data->args.errors[i] = errors[i];
+ data->args.num_errors++;
+ data->res.num_errors++;
+ }
+ msg.rpc_argp = &data->args;
+ msg.rpc_resp = &data->res;
+ task_setup.callback_data = data;
+ task_setup.rpc_client = NFS_SERVER(inode)->client;
+ nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
+ task = rpc_run_task(&task_setup);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ rpc_put_task(task);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nfs42_proc_layouterror);
+
+static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
+ struct file *dst_f, struct nfs_lock_context *src_lock,
+ struct nfs_lock_context *dst_lock, loff_t src_offset,
+ loff_t dst_offset, loff_t count)
+{
+ struct inode *src_inode = file_inode(src_f);
+ struct inode *dst_inode = file_inode(dst_f);
+ struct nfs_server *server = NFS_SERVER(dst_inode);
+ __u32 dst_bitmask[NFS_BITMASK_SZ];
+ struct nfs42_clone_args args = {
+ .src_fh = NFS_FH(src_inode),
+ .dst_fh = NFS_FH(dst_inode),
+ .src_offset = src_offset,
+ .dst_offset = dst_offset,
+ .count = count,
+ .dst_bitmask = dst_bitmask,
+ };
+ struct nfs42_clone_res res = {
+ .server = server,
+ };
+ int status;
+
+ msg->rpc_argp = &args;
+ msg->rpc_resp = &res;
+
+ status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
+ src_lock, FMODE_READ);
+ if (status) {
+ if (status == -EAGAIN)
+ status = -NFS4ERR_BAD_STATEID;
+ return status;
+ }
+ status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
+ dst_lock, FMODE_WRITE);
+ if (status) {
+ if (status == -EAGAIN)
+ status = -NFS4ERR_BAD_STATEID;
+ return status;
+ }
+
+ res.dst_fattr = nfs_alloc_fattr();
+ if (!res.dst_fattr)
+ return -ENOMEM;
+
+ nfs4_bitmask_set(dst_bitmask, server->cache_consistency_bitmask,
+ dst_inode, NFS_INO_INVALID_BLOCKS);
+
+ status = nfs4_call_sync(server->client, server, msg,
+ &args.seq_args, &res.seq_res, 0);
+ trace_nfs4_clone(src_inode, dst_inode, &args, status);
+ if (status == 0) {
+ /* a zero-length count means clone to EOF in src */
+ if (count == 0 && res.dst_fattr->valid & NFS_ATTR_FATTR_SIZE)
+ count = nfs_size_to_loff_t(res.dst_fattr->size) - dst_offset;
+ nfs42_copy_dest_done(dst_inode, dst_offset, count);
+ status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
+ }
+
+ kfree(res.dst_fattr);
+ return status;
+}
+
+int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
+ loff_t src_offset, loff_t dst_offset, loff_t count)
+{
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
+ };
+ struct inode *inode = file_inode(src_f);
+ struct nfs_server *server = NFS_SERVER(file_inode(src_f));
+ struct nfs_lock_context *src_lock;
+ struct nfs_lock_context *dst_lock;
+ struct nfs4_exception src_exception = { };
+ struct nfs4_exception dst_exception = { };
+ int err, err2;
+
+ if (!nfs_server_capable(inode, NFS_CAP_CLONE))
+ return -EOPNOTSUPP;
+
+ src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
+ if (IS_ERR(src_lock))
+ return PTR_ERR(src_lock);
+
+ src_exception.inode = file_inode(src_f);
+ src_exception.state = src_lock->open_context->state;
+
+ dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
+ if (IS_ERR(dst_lock)) {
+ err = PTR_ERR(dst_lock);
+ goto out_put_src_lock;
+ }
+
+ dst_exception.inode = file_inode(dst_f);
+ dst_exception.state = dst_lock->open_context->state;
+
+ do {
+ err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
+ src_offset, dst_offset, count);
+ if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
+ NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
+ err = -EOPNOTSUPP;
+ break;
+ }
+
+ err2 = nfs4_handle_exception(server, err, &src_exception);
+ err = nfs4_handle_exception(server, err, &dst_exception);
+ if (!err)
+ err = err2;
+ } while (src_exception.retry || dst_exception.retry);
+
+ nfs_put_lock_context(dst_lock);
+out_put_src_lock:
+ nfs_put_lock_context(src_lock);
+ return err;
+}
+
+#define NFS4XATTR_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
+
+static int _nfs42_proc_removexattr(struct inode *inode, const char *name)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs42_removexattrargs args = {
+ .fh = NFS_FH(inode),
+ .xattr_name = name,
+ };
+ struct nfs42_removexattrres res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVEXATTR],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ int ret;
+ unsigned long timestamp = jiffies;
+
+ ret = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
+ &res.seq_res, 1);
+ trace_nfs4_removexattr(inode, name, ret);
+ if (!ret)
+ nfs4_update_changeattr(inode, &res.cinfo, timestamp, 0);
+
+ return ret;
+}
+
+static int _nfs42_proc_setxattr(struct inode *inode, const char *name,
+ const void *buf, size_t buflen, int flags)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct page *pages[NFS4XATTR_MAXPAGES];
+ struct nfs42_setxattrargs arg = {
+ .fh = NFS_FH(inode),
+ .xattr_pages = pages,
+ .xattr_len = buflen,
+ .xattr_name = name,
+ .xattr_flags = flags,
+ };
+ struct nfs42_setxattrres res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETXATTR],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ };
+ int ret, np;
+ unsigned long timestamp = jiffies;
+
+ if (buflen > server->sxasize)
+ return -ERANGE;
+
+ if (buflen > 0) {
+ np = nfs4_buf_to_pages_noslab(buf, buflen, arg.xattr_pages);
+ if (np < 0)
+ return np;
+ } else
+ np = 0;
+
+ ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args,
+ &res.seq_res, 1);
+ trace_nfs4_setxattr(inode, name, ret);
+
+ for (; np > 0; np--)
+ put_page(pages[np - 1]);
+
+ if (!ret)
+ nfs4_update_changeattr(inode, &res.cinfo, timestamp, 0);
+
+ return ret;
+}
+
+static ssize_t _nfs42_proc_getxattr(struct inode *inode, const char *name,
+ void *buf, size_t buflen, struct page **pages,
+ size_t plen)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs42_getxattrargs arg = {
+ .fh = NFS_FH(inode),
+ .xattr_name = name,
+ };
+ struct nfs42_getxattrres res;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETXATTR],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ };
+ ssize_t ret;
+
+ arg.xattr_len = plen;
+ arg.xattr_pages = pages;
+
+ ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args,
+ &res.seq_res, 0);
+ trace_nfs4_getxattr(inode, name, ret);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Normally, the caching is done one layer up, but for successful
+ * RPCS, always cache the result here, even if the caller was
+ * just querying the length, or if the reply was too big for
+ * the caller. This avoids a second RPC in the case of the
+ * common query-alloc-retrieve cycle for xattrs.
+ *
+ * Note that xattr_len is always capped to XATTR_SIZE_MAX.
+ */
+
+ nfs4_xattr_cache_add(inode, name, NULL, pages, res.xattr_len);
+
+ if (buflen) {
+ if (res.xattr_len > buflen)
+ return -ERANGE;
+ _copy_from_pages(buf, pages, 0, res.xattr_len);
+ }
+
+ return res.xattr_len;
+}
+
+static ssize_t _nfs42_proc_listxattrs(struct inode *inode, void *buf,
+ size_t buflen, u64 *cookiep, bool *eofp)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct page **pages;
+ struct nfs42_listxattrsargs arg = {
+ .fh = NFS_FH(inode),
+ .cookie = *cookiep,
+ };
+ struct nfs42_listxattrsres res = {
+ .eof = false,
+ .xattr_buf = buf,
+ .xattr_len = buflen,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LISTXATTRS],
+ .rpc_argp = &arg,
+ .rpc_resp = &res,
+ };
+ u32 xdrlen;
+ int ret, np, i;
+
+
+ ret = -ENOMEM;
+ res.scratch = alloc_page(GFP_KERNEL);
+ if (!res.scratch)
+ goto out;
+
+ xdrlen = nfs42_listxattr_xdrsize(buflen);
+ if (xdrlen > server->lxasize)
+ xdrlen = server->lxasize;
+ np = xdrlen / PAGE_SIZE + 1;
+
+ pages = kcalloc(np, sizeof(struct page *), GFP_KERNEL);
+ if (!pages)
+ goto out_free_scratch;
+ for (i = 0; i < np; i++) {
+ pages[i] = alloc_page(GFP_KERNEL);
+ if (!pages[i])
+ goto out_free_pages;
+ }
+
+ arg.xattr_pages = pages;
+ arg.count = xdrlen;
+
+ ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args,
+ &res.seq_res, 0);
+ trace_nfs4_listxattr(inode, ret);
+
+ if (ret >= 0) {
+ ret = res.copied;
+ *cookiep = res.cookie;
+ *eofp = res.eof;
+ }
+
+out_free_pages:
+ while (--np >= 0) {
+ if (pages[np])
+ __free_page(pages[np]);
+ }
+ kfree(pages);
+out_free_scratch:
+ __free_page(res.scratch);
+out:
+ return ret;
+
+}
+
+ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name,
+ void *buf, size_t buflen)
+{
+ struct nfs4_exception exception = { };
+ ssize_t err, np, i;
+ struct page **pages;
+
+ np = nfs_page_array_len(0, buflen ?: XATTR_SIZE_MAX);
+ pages = kmalloc_array(np, sizeof(*pages), GFP_KERNEL);
+ if (!pages)
+ return -ENOMEM;
+
+ for (i = 0; i < np; i++) {
+ pages[i] = alloc_page(GFP_KERNEL);
+ if (!pages[i]) {
+ err = -ENOMEM;
+ goto out;
+ }
+ }
+
+ /*
+ * The GETXATTR op has no length field in the call, and the
+ * xattr data is at the end of the reply.
+ *
+ * There is no downside in using the page-aligned length. It will
+ * allow receiving and caching xattrs that are too large for the
+ * caller but still fit in the page-rounded value.
+ */
+ do {
+ err = _nfs42_proc_getxattr(inode, name, buf, buflen,
+ pages, np * PAGE_SIZE);
+ if (err >= 0)
+ break;
+ err = nfs4_handle_exception(NFS_SERVER(inode), err,
+ &exception);
+ } while (exception.retry);
+
+out:
+ while (--i >= 0)
+ __free_page(pages[i]);
+ kfree(pages);
+
+ return err;
+}
+
+int nfs42_proc_setxattr(struct inode *inode, const char *name,
+ const void *buf, size_t buflen, int flags)
+{
+ struct nfs4_exception exception = { };
+ int err;
+
+ do {
+ err = _nfs42_proc_setxattr(inode, name, buf, buflen, flags);
+ if (!err)
+ break;
+ err = nfs4_handle_exception(NFS_SERVER(inode), err,
+ &exception);
+ } while (exception.retry);
+
+ return err;
+}
+
+ssize_t nfs42_proc_listxattrs(struct inode *inode, void *buf,
+ size_t buflen, u64 *cookiep, bool *eofp)
+{
+ struct nfs4_exception exception = { };
+ ssize_t err;
+
+ do {
+ err = _nfs42_proc_listxattrs(inode, buf, buflen,
+ cookiep, eofp);
+ if (err >= 0)
+ break;
+ err = nfs4_handle_exception(NFS_SERVER(inode), err,
+ &exception);
+ } while (exception.retry);
+
+ return err;
+}
+
+int nfs42_proc_removexattr(struct inode *inode, const char *name)
+{
+ struct nfs4_exception exception = { };
+ int err;
+
+ do {
+ err = _nfs42_proc_removexattr(inode, name);
+ if (!err)
+ break;
+ err = nfs4_handle_exception(NFS_SERVER(inode), err,
+ &exception);
+ } while (exception.retry);
+
+ return err;
+}