fs/nfs/nfs42proc.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
  */
 #include <linux/fs.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 "internal.h"

 #define NFSDBG_FACILITY NFSDBG_PROC

 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);
 	struct nfs42_falloc_args args = {
 		.falloc_fh	= NFS_FH(inode),
 		.falloc_offset	= offset,
 		.falloc_length	= len,
 		.falloc_bitmask	= server->cache_consistency_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)
 		return status;

 	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)
 		status = nfs_post_op_update_inode(inode, res.falloc_fattr);

 	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 nfs_server *server = NFS_SERVER(file_inode(filep));
 	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 = file_inode(filep);
 	exception.state = lock->open_context->state;

 	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);

 	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 = nfs_sync_inode(inode);
 	if (err)
 		goto out_unlock;

 	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;
 out_unlock:
 	inode_unlock(inode);
 	return err;
 }

 static ssize_t _nfs42_proc_copy(struct file *src, loff_t pos_src,
 				struct nfs_lock_context *src_lock,
 				struct file *dst, loff_t pos_dst,
 				struct nfs_lock_context *dst_lock,
 				size_t count)
 {
 	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,
 	};
 	struct nfs42_copy_res res;
 	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 nfs_server *server = NFS_SERVER(dst_inode);
 	int status;

 	status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 				     src_lock, FMODE_READ);
 	if (status)
 		return status;

 	status = nfs_filemap_write_and_wait_range(file_inode(src)->i_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)
 		return status;

 	status = nfs_sync_inode(dst_inode);
 	if (status)
 		return status;

 	status = nfs4_call_sync(server->client, server, &msg,
 				&args.seq_args, &res.seq_res, 0);
 	if (status == -ENOTSUPP)
 		server->caps &= ~NFS_CAP_COPY;
 	if (status)
 		return status;

 	if (res.write_res.verifier.committed != NFS_FILE_SYNC) {
 		status = nfs_commit_file(dst, &res.write_res.verifier.verifier);
 		if (status)
 			return status;
 	}

 	truncate_pagecache_range(dst_inode, pos_dst,
 				 pos_dst + res.write_res.count);

 	return res.write_res.count;
 }

 ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 			struct file *dst, loff_t pos_dst,
 			size_t count)
 {
 	struct nfs_server *server = NFS_SERVER(file_inode(dst));
 	struct nfs_lock_context *src_lock;
 	struct nfs_lock_context *dst_lock;
 	struct nfs4_exception src_exception = { };
 	struct nfs4_exception dst_exception = { };
 	ssize_t err, err2;

 	if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
 		return -EOPNOTSUPP;

 	src_lock = nfs_get_lock_context(nfs_file_open_context(src));
 	if (IS_ERR(src_lock))
 		return PTR_ERR(src_lock);

 	src_exception.inode = file_inode(src);
 	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.inode = file_inode(dst);
 	dst_exception.state = dst_lock->open_context->state;

 	do {
 		inode_lock(file_inode(dst));
 		err = _nfs42_proc_copy(src, pos_src, src_lock,
 				       dst, pos_dst, dst_lock, count);
 		inode_unlock(file_inode(dst));

 		if (err == -ENOTSUPP) {
 			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;
 }

 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)
 		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);
 	if (status == -ENOTSUPP)
 		server->caps &= ~NFS_CAP_SEEK;
 	if (status)
 		return status;

 	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 nfs_server *server = NFS_SERVER(data->args.inode);

 	nfs41_setup_sequence(nfs4_get_session(server), &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:
 		break;
 	case -NFS4ERR_EXPIRED:
 	case -NFS4ERR_STALE_STATEID:
 	case -NFS4ERR_OLD_STATEID:
 	case -NFS4ERR_BAD_STATEID:
 		spin_lock(&inode->i_lock);
 		lo = NFS_I(inode)->layout;
 		if (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);
 		} else
 			spin_unlock(&inode->i_lock);
 		break;
 	case -ENOTSUPP:
 	case -EOPNOTSUPP:
 		NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
 	default:
 		break;
 	}

 	dprintk("%s server returns %d\n", __func__, task->tk_status);
 }

 static void
 nfs42_layoutstat_release(void *calldata)
 {
 	struct nfs42_layoutstat_data *data = calldata;
 	struct nfs_server *nfss = NFS_SERVER(data->args.inode);

 	if (nfss->pnfs_curr_ld->cleanup_layoutstats)
 		nfss->pnfs_curr_ld->cleanup_layoutstats(data);

 	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);
 	task = rpc_run_task(&task_setup);
 	if (IS_ERR(task))
 		return PTR_ERR(task);
 	return 0;
 }

 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);
 	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 = server->cache_consistency_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)
 		return status;

 	status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 			dst_lock, FMODE_WRITE);
 	if (status)
 		return status;

 	res.dst_fattr = nfs_alloc_fattr();
 	if (!res.dst_fattr)
 		return -ENOMEM;

 	status = nfs4_call_sync(server->client, server, msg,
 				&args.seq_args, &res.seq_res, 0);
 	if (status == 0)
 		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;
 }
	/*
	* Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
	*/
	#include <linux/fs.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 "internal.h"

	#define NFSDBG_FACILITY NFSDBG_PROC

	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);
	struct nfs42_falloc_args args = {
	.falloc_fh = NFS_FH(inode),
	.falloc_offset = offset,
	.falloc_length = len,
	.falloc_bitmask = server->cache_consistency_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)
	return status;

	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)
	status = nfs_post_op_update_inode(inode, res.falloc_fattr);

	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 nfs_server *server = NFS_SERVER(file_inode(filep));
	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 = file_inode(filep);
	exception.state = lock->open_context->state;

	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);

	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 = nfs_sync_inode(inode);
	if (err)
	goto out_unlock;

	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;
	out_unlock:
	inode_unlock(inode);
	return err;
	}

	static ssize_t _nfs42_proc_copy(struct file *src, loff_t pos_src,
	struct nfs_lock_context *src_lock,
	struct file *dst, loff_t pos_dst,
	struct nfs_lock_context *dst_lock,
	size_t count)
	{
	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,
	};
	struct nfs42_copy_res res;
	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 nfs_server *server = NFS_SERVER(dst_inode);
	int status;

	status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
	src_lock, FMODE_READ);
	if (status)
	return status;

	status = nfs_filemap_write_and_wait_range(file_inode(src)->i_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)
	return status;

	status = nfs_sync_inode(dst_inode);
	if (status)
	return status;

	status = nfs4_call_sync(server->client, server, &msg,
	&args.seq_args, &res.seq_res, 0);
	if (status == -ENOTSUPP)
	server->caps &= ~NFS_CAP_COPY;
	if (status)
	return status;

	if (res.write_res.verifier.committed != NFS_FILE_SYNC) {
	status = nfs_commit_file(dst, &res.write_res.verifier.verifier);
	if (status)
	return status;
	}

	truncate_pagecache_range(dst_inode, pos_dst,
	pos_dst + res.write_res.count);

	return res.write_res.count;
	}

	ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
	struct file *dst, loff_t pos_dst,
	size_t count)
	{
	struct nfs_server *server = NFS_SERVER(file_inode(dst));
	struct nfs_lock_context *src_lock;
	struct nfs_lock_context *dst_lock;
	struct nfs4_exception src_exception = { };
	struct nfs4_exception dst_exception = { };
	ssize_t err, err2;

	if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
	return -EOPNOTSUPP;

	src_lock = nfs_get_lock_context(nfs_file_open_context(src));
	if (IS_ERR(src_lock))
	return PTR_ERR(src_lock);

	src_exception.inode = file_inode(src);
	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.inode = file_inode(dst);
	dst_exception.state = dst_lock->open_context->state;

	do {
	inode_lock(file_inode(dst));
	err = _nfs42_proc_copy(src, pos_src, src_lock,
	dst, pos_dst, dst_lock, count);
	inode_unlock(file_inode(dst));

	if (err == -ENOTSUPP) {
	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;
	}

	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)
	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);
	if (status == -ENOTSUPP)
	server->caps &= ~NFS_CAP_SEEK;
	if (status)
	return status;

	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 nfs_server *server = NFS_SERVER(data->args.inode);

	nfs41_setup_sequence(nfs4_get_session(server), &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:
	break;
	case -NFS4ERR_EXPIRED:
	case -NFS4ERR_STALE_STATEID:
	case -NFS4ERR_OLD_STATEID:
	case -NFS4ERR_BAD_STATEID:
	spin_lock(&inode->i_lock);
	lo = NFS_I(inode)->layout;
	if (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);
	} else
	spin_unlock(&inode->i_lock);
	break;
	case -ENOTSUPP:
	case -EOPNOTSUPP:
	NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
	default:
	break;
	}

	dprintk("%s server returns %d\n", __func__, task->tk_status);
	}

	static void
	nfs42_layoutstat_release(void *calldata)
	{
	struct nfs42_layoutstat_data *data = calldata;
	struct nfs_server *nfss = NFS_SERVER(data->args.inode);

	if (nfss->pnfs_curr_ld->cleanup_layoutstats)
	nfss->pnfs_curr_ld->cleanup_layoutstats(data);

	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);
	task = rpc_run_task(&task_setup);
	if (IS_ERR(task))
	return PTR_ERR(task);
	return 0;
	}

	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);
	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 = server->cache_consistency_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)
	return status;

	status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
	dst_lock, FMODE_WRITE);
	if (status)
	return status;

	res.dst_fattr = nfs_alloc_fattr();
	if (!res.dst_fattr)
	return -ENOMEM;

	status = nfs4_call_sync(server->client, server, msg,
	&args.seq_args, &res.seq_res, 0);
	if (status == 0)
	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;
	}