[deliverable/linux.git] / fs / nfs / nfs42proc.c

/*
 * 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;
}
Commit	Line	Data
1c6dcbe5 AS	1	/*
	2	* Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
	3	*/
	4	#include <linux/fs.h>
	5	#include <linux/sunrpc/sched.h>
	6	#include <linux/nfs.h>
	7	#include <linux/nfs3.h>
	8	#include <linux/nfs4.h>
	9	#include <linux/nfs_xdr.h>
	10	#include <linux/nfs_fs.h>
	11	#include "nfs4_fs.h"
	12	#include "nfs42.h"
1b4a4bd8 PT	13	#include "iostat.h"
	14	#include "pnfs.h"
	15	#include "internal.h"
	16
291e1b94	17	#define NFSDBG_FACILITY NFSDBG_PROC
1c6dcbe5	18
f4ac1674	19	static int _nfs42_proc_fallocate(struct rpc_message msg, struct file filep,
4bdf87eb	20	struct nfs_lock_context *lock, loff_t offset, loff_t len)
f4ac1674 AS	21	{
f4ac1674 AS	22	struct inode *inode = file_inode(filep);
9a51940b	23	struct nfs_server *server = NFS_SERVER(inode);
f4ac1674 AS	24	struct nfs42_falloc_args args = {
	25	.falloc_fh = NFS_FH(inode),
	26	.falloc_offset = offset,
	27	.falloc_length = len,
9a51940b AS	28	.falloc_bitmask = server->cache_consistency_bitmask,
	29	};
	30	struct nfs42_falloc_res res = {
	31	.falloc_server = server,
f4ac1674	32	};
f4ac1674 AS	33	int status;
	34
	35	msg->rpc_argp = &args;
	36	msg->rpc_resp = &res;
	37
4bdf87eb CH	38	status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
4bdf87eb CH	39	lock, FMODE_WRITE);
f4ac1674 AS	40	if (status)
	41	return status;
	42
9a51940b AS	43	res.falloc_fattr = nfs_alloc_fattr();
	44	if (!res.falloc_fattr)
	45	return -ENOMEM;
	46
	47	status = nfs4_call_sync(server->client, server, msg,
	48	&args.seq_args, &res.seq_res, 0);
	49	if (status == 0)
	50	status = nfs_post_op_update_inode(inode, res.falloc_fattr);
	51
	52	kfree(res.falloc_fattr);
	53	return status;
f4ac1674 AS	54	}
	55
	56	static int nfs42_proc_fallocate(struct rpc_message msg, struct file filep,
	57	loff_t offset, loff_t len)
	58	{
	59	struct nfs_server *server = NFS_SERVER(file_inode(filep));
	60	struct nfs4_exception exception = { };
4bdf87eb	61	struct nfs_lock_context *lock;
f4ac1674 AS	62	int err;
f4ac1674 AS	63
4bdf87eb CH	64	lock = nfs_get_lock_context(nfs_file_open_context(filep));
	65	if (IS_ERR(lock))
	66	return PTR_ERR(lock);
	67
	68	exception.inode = file_inode(filep);
	69	exception.state = lock->open_context->state;
	70
f4ac1674	71	do {
4bdf87eb CH	72	err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
	73	if (err == -ENOTSUPP) {
	74	err = -EOPNOTSUPP;
	75	break;
	76	}
f4ac1674 AS	77	err = nfs4_handle_exception(server, err, &exception);
	78	} while (exception.retry);
	79
4bdf87eb	80	nfs_put_lock_context(lock);
f4ac1674 AS	81	return err;
	82	}
	83
	84	int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
	85	{
	86	struct rpc_message msg = {
	87	.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
	88	};
	89	struct inode *inode = file_inode(filep);
	90	int err;
	91
	92	if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
	93	return -EOPNOTSUPP;
	94
5955102c	95	inode_lock(inode);
f830f7dd	96
f4ac1674 AS	97	err = nfs42_proc_fallocate(&msg, filep, offset, len);
	98	if (err == -EOPNOTSUPP)
	99	NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
f830f7dd	100
5955102c	101	inode_unlock(inode);
f4ac1674 AS	102	return err;
	103	}
	104
624bd5b7 AS	105	int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
	106	{
	107	struct rpc_message msg = {
	108	.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
	109	};
	110	struct inode *inode = file_inode(filep);
	111	int err;
	112
	113	if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
	114	return -EOPNOTSUPP;
	115
5955102c	116	inode_lock(inode);
1e564d3d TM	117	err = nfs_sync_inode(inode);
	118	if (err)
	119	goto out_unlock;
f830f7dd	120
624bd5b7	121	err = nfs42_proc_fallocate(&msg, filep, offset, len);
9a51940b AS	122	if (err == 0)
9a51940b AS	123	truncate_pagecache_range(inode, offset, (offset + len) -1);
624bd5b7 AS	124	if (err == -EOPNOTSUPP)
624bd5b7 AS	125	NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
1e564d3d	126	out_unlock:
5955102c	127	inode_unlock(inode);
624bd5b7 AS	128	return err;
	129	}
	130
2e72448b AS	131	static ssize_t _nfs42_proc_copy(struct file *src, loff_t pos_src,
	132	struct nfs_lock_context *src_lock,
	133	struct file *dst, loff_t pos_dst,
	134	struct nfs_lock_context *dst_lock,
	135	size_t count)
	136	{
	137	struct nfs42_copy_args args = {
	138	.src_fh = NFS_FH(file_inode(src)),
	139	.src_pos = pos_src,
	140	.dst_fh = NFS_FH(file_inode(dst)),
	141	.dst_pos = pos_dst,
	142	.count = count,
	143	};
	144	struct nfs42_copy_res res;
	145	struct rpc_message msg = {
	146	.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
	147	.rpc_argp = &args,
	148	.rpc_resp = &res,
	149	};
	150	struct inode *dst_inode = file_inode(dst);
	151	struct nfs_server *server = NFS_SERVER(dst_inode);
	152	int status;
	153
	154	status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
	155	src_lock, FMODE_READ);
	156	if (status)
	157	return status;
	158
837bb1d7 TM	159	status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping,
	160	pos_src, pos_src + (loff_t)count - 1);
	161	if (status)
	162	return status;
	163
2e72448b AS	164	status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
	165	dst_lock, FMODE_WRITE);
	166	if (status)
	167	return status;
837bb1d7 TM	168
	169	status = nfs_sync_inode(dst_inode);
	170	if (status)
	171	return status;
2e72448b AS	172
	173	status = nfs4_call_sync(server->client, server, &msg,
	174	&args.seq_args, &res.seq_res, 0);
	175	if (status == -ENOTSUPP)
	176	server->caps &= ~NFS_CAP_COPY;
	177	if (status)
	178	return status;
	179
	180	if (res.write_res.verifier.committed != NFS_FILE_SYNC) {
	181	status = nfs_commit_file(dst, &res.write_res.verifier.verifier);
	182	if (status)
	183	return status;
	184	}
	185
	186	truncate_pagecache_range(dst_inode, pos_dst,
	187	pos_dst + res.write_res.count);
	188
	189	return res.write_res.count;
	190	}
	191
	192	ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
	193	struct file *dst, loff_t pos_dst,
	194	size_t count)
	195	{
	196	struct nfs_server *server = NFS_SERVER(file_inode(dst));
	197	struct nfs_lock_context *src_lock;
	198	struct nfs_lock_context *dst_lock;
	199	struct nfs4_exception src_exception = { };
	200	struct nfs4_exception dst_exception = { };
	201	ssize_t err, err2;
	202
	203	if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
	204	return -EOPNOTSUPP;
	205
	206	src_lock = nfs_get_lock_context(nfs_file_open_context(src));
	207	if (IS_ERR(src_lock))
	208	return PTR_ERR(src_lock);
	209
	210	src_exception.inode = file_inode(src);
	211	src_exception.state = src_lock->open_context->state;
	212
	213	dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
	214	if (IS_ERR(dst_lock)) {
	215	err = PTR_ERR(dst_lock);
	216	goto out_put_src_lock;
	217	}
	218
	219	dst_exception.inode = file_inode(dst);
	220	dst_exception.state = dst_lock->open_context->state;
	221
	222	do {
ea8ea737	223	inode_lock(file_inode(dst));
2e72448b AS	224	err = _nfs42_proc_copy(src, pos_src, src_lock,
2e72448b AS	225	dst, pos_dst, dst_lock, count);
ea8ea737	226	inode_unlock(file_inode(dst));
2e72448b AS	227
	228	if (err == -ENOTSUPP) {
	229	err = -EOPNOTSUPP;
	230	break;
	231	}
	232
	233	err2 = nfs4_handle_exception(server, err, &src_exception);
	234	err = nfs4_handle_exception(server, err, &dst_exception);
	235	if (!err)
	236	err = err2;
	237	} while (src_exception.retry \|\| dst_exception.retry);
	238
	239	nfs_put_lock_context(dst_lock);
	240	out_put_src_lock:
	241	nfs_put_lock_context(src_lock);
	242	return err;
	243	}
	244
4bdf87eb CH	245	static loff_t _nfs42_proc_llseek(struct file *filep,
4bdf87eb CH	246	struct nfs_lock_context *lock, loff_t offset, int whence)
1c6dcbe5 AS	247	{
	248	struct inode *inode = file_inode(filep);
	249	struct nfs42_seek_args args = {
	250	.sa_fh = NFS_FH(inode),
	251	.sa_offset = offset,
	252	.sa_what = (whence == SEEK_HOLE) ?
	253	NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
	254	};
	255	struct nfs42_seek_res res;
	256	struct rpc_message msg = {
	257	.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
	258	.rpc_argp = &args,
	259	.rpc_resp = &res,
	260	};
	261	struct nfs_server *server = NFS_SERVER(inode);
	262	int status;
	263
878ffa9f	264	if (!nfs_server_capable(inode, NFS_CAP_SEEK))
1c6dcbe5 AS	265	return -ENOTSUPP;
1c6dcbe5 AS	266
4bdf87eb CH	267	status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
4bdf87eb CH	268	lock, FMODE_READ);
1c6dcbe5 AS	269	if (status)
	270	return status;
	271
e95fc4a0 TM	272	status = nfs_filemap_write_and_wait_range(inode->i_mapping,
	273	offset, LLONG_MAX);
	274	if (status)
	275	return status;
	276
1c6dcbe5 AS	277	status = nfs4_call_sync(server->client, server, &msg,
	278	&args.seq_args, &res.seq_res, 0);
	279	if (status == -ENOTSUPP)
	280	server->caps &= ~NFS_CAP_SEEK;
	281	if (status)
	282	return status;
	283
	284	return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
	285	}
be3a5d23	286
bdcc2cd1 BF	287	loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
	288	{
	289	struct nfs_server *server = NFS_SERVER(file_inode(filep));
	290	struct nfs4_exception exception = { };
4bdf87eb	291	struct nfs_lock_context *lock;
306a5549	292	loff_t err;
bdcc2cd1	293
4bdf87eb CH	294	lock = nfs_get_lock_context(nfs_file_open_context(filep));
	295	if (IS_ERR(lock))
	296	return PTR_ERR(lock);
	297
	298	exception.inode = file_inode(filep);
	299	exception.state = lock->open_context->state;
	300
bdcc2cd1	301	do {
4bdf87eb	302	err = _nfs42_proc_llseek(filep, lock, offset, whence);
306a5549 BF	303	if (err >= 0)
306a5549 BF	304	break;
4bdf87eb CH	305	if (err == -ENOTSUPP) {
	306	err = -EOPNOTSUPP;
	307	break;
	308	}
bdcc2cd1 BF	309	err = nfs4_handle_exception(server, err, &exception);
	310	} while (exception.retry);
	311
4bdf87eb	312	nfs_put_lock_context(lock);
bdcc2cd1 BF	313	return err;
	314	}
	315
	316
1b4a4bd8 PT	317	static void
	318	nfs42_layoutstat_prepare(struct rpc_task task, void calldata)
	319	{
	320	struct nfs42_layoutstat_data *data = calldata;
	321	struct nfs_server *server = NFS_SERVER(data->args.inode);
	322
	323	nfs41_setup_sequence(nfs4_get_session(server), &data->args.seq_args,
	324	&data->res.seq_res, task);
	325	}
	326
	327	static void
	328	nfs42_layoutstat_done(struct rpc_task task, void calldata)
	329	{
	330	struct nfs42_layoutstat_data *data = calldata;
68d264cf PT	331	struct inode *inode = data->inode;
68d264cf PT	332	struct pnfs_layout_hdr *lo;
1b4a4bd8 PT	333
	334	if (!nfs4_sequence_done(task, &data->res.seq_res))
	335	return;
	336
6c5a0d89 TM	337	switch (task->tk_status) {
	338	case 0:
	339	break;
68d264cf PT	340	case -NFS4ERR_EXPIRED:
	341	case -NFS4ERR_STALE_STATEID:
	342	case -NFS4ERR_OLD_STATEID:
	343	case -NFS4ERR_BAD_STATEID:
	344	spin_lock(&inode->i_lock);
	345	lo = NFS_I(inode)->layout;
	346	if (lo && nfs4_stateid_match(&data->args.stateid,
	347	&lo->plh_stateid)) {
	348	LIST_HEAD(head);
	349
	350	/*
	351	* Mark the bad layout state as invalid, then retry
	352	* with the current stateid.
	353	*/
5f46be04	354	pnfs_mark_layout_stateid_invalid(lo, &head);
68d264cf PT	355	spin_unlock(&inode->i_lock);
	356	pnfs_free_lseg_list(&head);
	357	} else
	358	spin_unlock(&inode->i_lock);
	359	break;
6c5a0d89 TM	360	case -ENOTSUPP:
6c5a0d89 TM	361	case -EOPNOTSUPP:
68d264cf	362	NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
6c5a0d89	363	default:
68d264cf	364	break;
6c5a0d89	365	}
68d264cf PT	366
68d264cf PT	367	dprintk("%s server returns %d\n", __func__, task->tk_status);
1b4a4bd8 PT	368	}
	369
	370	static void
	371	nfs42_layoutstat_release(void *calldata)
	372	{
	373	struct nfs42_layoutstat_data *data = calldata;
8733408d PT	374	struct nfs_server *nfss = NFS_SERVER(data->args.inode);
	375
	376	if (nfss->pnfs_curr_ld->cleanup_layoutstats)
	377	nfss->pnfs_curr_ld->cleanup_layoutstats(data);
1b4a4bd8 PT	378
1b4a4bd8 PT	379	pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
1bfe3b25 PT	380	smp_mb__before_atomic();
	381	clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
	382	smp_mb__after_atomic();
1b4a4bd8 PT	383	nfs_iput_and_deactive(data->inode);
	384	kfree(data->args.devinfo);
	385	kfree(data);
	386	}
	387
be3a5d23	388	static const struct rpc_call_ops nfs42_layoutstat_ops = {
1b4a4bd8 PT	389	.rpc_call_prepare = nfs42_layoutstat_prepare,
	390	.rpc_call_done = nfs42_layoutstat_done,
	391	.rpc_release = nfs42_layoutstat_release,
be3a5d23 TM	392	};
	393
	394	int nfs42_proc_layoutstats_generic(struct nfs_server *server,
	395	struct nfs42_layoutstat_data *data)
	396	{
	397	struct rpc_message msg = {
	398	.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
	399	.rpc_argp = &data->args,
	400	.rpc_resp = &data->res,
	401	};
	402	struct rpc_task_setup task_setup = {
	403	.rpc_client = server->client,
	404	.rpc_message = &msg,
	405	.callback_ops = &nfs42_layoutstat_ops,
	406	.callback_data = data,
	407	.flags = RPC_TASK_ASYNC,
	408	};
	409	struct rpc_task *task;
	410
1b4a4bd8 PT	411	data->inode = nfs_igrab_and_active(data->args.inode);
	412	if (!data->inode) {
	413	nfs42_layoutstat_release(data);
	414	return -EAGAIN;
	415	}
be3a5d23 TM	416	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
	417	task = rpc_run_task(&task_setup);
	418	if (IS_ERR(task))
	419	return PTR_ERR(task);
	420	return 0;
	421	}
e5341f3a PT	422
e5341f3a PT	423	static int _nfs42_proc_clone(struct rpc_message msg, struct file src_f,
4bdf87eb CH	424	struct file dst_f, struct nfs_lock_context src_lock,
	425	struct nfs_lock_context *dst_lock, loff_t src_offset,
	426	loff_t dst_offset, loff_t count)
e5341f3a PT	427	{
	428	struct inode *src_inode = file_inode(src_f);
	429	struct inode *dst_inode = file_inode(dst_f);
	430	struct nfs_server *server = NFS_SERVER(dst_inode);
	431	struct nfs42_clone_args args = {
	432	.src_fh = NFS_FH(src_inode),
	433	.dst_fh = NFS_FH(dst_inode),
	434	.src_offset = src_offset,
	435	.dst_offset = dst_offset,
9494b2ce	436	.count = count,
e5341f3a PT	437	.dst_bitmask = server->cache_consistency_bitmask,
	438	};
	439	struct nfs42_clone_res res = {
	440	.server = server,
	441	};
	442	int status;
	443
	444	msg->rpc_argp = &args;
	445	msg->rpc_resp = &res;
	446
4bdf87eb CH	447	status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
4bdf87eb CH	448	src_lock, FMODE_READ);
e5341f3a PT	449	if (status)
	450	return status;
	451
4bdf87eb CH	452	status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
4bdf87eb CH	453	dst_lock, FMODE_WRITE);
e5341f3a PT	454	if (status)
	455	return status;
	456
	457	res.dst_fattr = nfs_alloc_fattr();
	458	if (!res.dst_fattr)
	459	return -ENOMEM;
	460
	461	status = nfs4_call_sync(server->client, server, msg,
	462	&args.seq_args, &res.seq_res, 0);
	463	if (status == 0)
	464	status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
	465
	466	kfree(res.dst_fattr);
	467	return status;
	468	}
	469
	470	int nfs42_proc_clone(struct file src_f, struct file dst_f,
	471	loff_t src_offset, loff_t dst_offset, loff_t count)
	472	{
	473	struct rpc_message msg = {
	474	.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
	475	};
	476	struct inode *inode = file_inode(src_f);
	477	struct nfs_server *server = NFS_SERVER(file_inode(src_f));
4bdf87eb CH	478	struct nfs_lock_context *src_lock;
	479	struct nfs_lock_context *dst_lock;
	480	struct nfs4_exception src_exception = { };
	481	struct nfs4_exception dst_exception = { };
	482	int err, err2;
e5341f3a PT	483
	484	if (!nfs_server_capable(inode, NFS_CAP_CLONE))
	485	return -EOPNOTSUPP;
	486
4bdf87eb CH	487	src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
	488	if (IS_ERR(src_lock))
	489	return PTR_ERR(src_lock);
	490
	491	src_exception.inode = file_inode(src_f);
	492	src_exception.state = src_lock->open_context->state;
	493
	494	dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
	495	if (IS_ERR(dst_lock)) {
	496	err = PTR_ERR(dst_lock);
	497	goto out_put_src_lock;
	498	}
	499
	500	dst_exception.inode = file_inode(dst_f);
	501	dst_exception.state = dst_lock->open_context->state;
	502
e5341f3a	503	do {
4bdf87eb CH	504	err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
4bdf87eb CH	505	src_offset, dst_offset, count);
e5341f3a PT	506	if (err == -ENOTSUPP \|\| err == -EOPNOTSUPP) {
e5341f3a PT	507	NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
4bdf87eb CH	508	err = -EOPNOTSUPP;
4bdf87eb CH	509	break;
e5341f3a	510	}
e5341f3a	511
4bdf87eb CH	512	err2 = nfs4_handle_exception(server, err, &src_exception);
	513	err = nfs4_handle_exception(server, err, &dst_exception);
	514	if (!err)
	515	err = err2;
	516	} while (src_exception.retry \|\| dst_exception.retry);
e5341f3a	517
4bdf87eb CH	518	nfs_put_lock_context(dst_lock);
	519	out_put_src_lock:
	520	nfs_put_lock_context(src_lock);
	521	return err;
e5341f3a	522	}