[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 = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
				     dst_lock, FMODE_WRITE);
	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;

	nfs_wb_all(inode);
	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.
			 */
			set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
			pnfs_mark_matching_lsegs_invalid(lo, &head, NULL, 0);
			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
	159	status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
	160	dst_lock, FMODE_WRITE);
	161	if (status)
	162	return status;
	163
	164	status = nfs4_call_sync(server->client, server, &msg,
	165	&args.seq_args, &res.seq_res, 0);
	166	if (status == -ENOTSUPP)
	167	server->caps &= ~NFS_CAP_COPY;
	168	if (status)
	169	return status;
	170
	171	if (res.write_res.verifier.committed != NFS_FILE_SYNC) {
	172	status = nfs_commit_file(dst, &res.write_res.verifier.verifier);
	173	if (status)
	174	return status;
	175	}
	176
	177	truncate_pagecache_range(dst_inode, pos_dst,
	178	pos_dst + res.write_res.count);
	179
	180	return res.write_res.count;
	181	}
	182
	183	ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
	184	struct file *dst, loff_t pos_dst,
	185	size_t count)
	186	{
	187	struct nfs_server *server = NFS_SERVER(file_inode(dst));
	188	struct nfs_lock_context *src_lock;
	189	struct nfs_lock_context *dst_lock;
	190	struct nfs4_exception src_exception = { };
	191	struct nfs4_exception dst_exception = { };
	192	ssize_t err, err2;
	193
	194	if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
195	return -EOPNOTSUPP;
196
197	src_lock = nfs_get_lock_context(nfs_file_open_context(src));
198	if (IS_ERR(src_lock))
199	return PTR_ERR(src_lock);
200
201	src_exception.inode = file_inode(src);
202	src_exception.state = src_lock->open_context->state;
203
204	dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
205	if (IS_ERR(dst_lock)) {
206	err = PTR_ERR(dst_lock);
207	goto out_put_src_lock;
208	}
209
210	dst_exception.inode = file_inode(dst);
211	dst_exception.state = dst_lock->open_context->state;
212
213	do {
ea8ea737	214	inode_lock(file_inode(dst));
2e72448b AS	215	err = _nfs42_proc_copy(src, pos_src, src_lock,
2e72448b AS	216	dst, pos_dst, dst_lock, count);
ea8ea737	217	inode_unlock(file_inode(dst));
2e72448b AS	218
	219	if (err == -ENOTSUPP) {
	220	err = -EOPNOTSUPP;
	221	break;
	222	}
	223
	224	err2 = nfs4_handle_exception(server, err, &src_exception);
	225	err = nfs4_handle_exception(server, err, &dst_exception);
	226	if (!err)
	227	err = err2;
	228	} while (src_exception.retry \|\| dst_exception.retry);
	229
	230	nfs_put_lock_context(dst_lock);
	231	out_put_src_lock:
	232	nfs_put_lock_context(src_lock);
	233	return err;
	234	}
	235
4bdf87eb CH	236	static loff_t _nfs42_proc_llseek(struct file *filep,
4bdf87eb CH	237	struct nfs_lock_context *lock, loff_t offset, int whence)
1c6dcbe5 AS	238	{
	239	struct inode *inode = file_inode(filep);
	240	struct nfs42_seek_args args = {
	241	.sa_fh = NFS_FH(inode),
	242	.sa_offset = offset,
	243	.sa_what = (whence == SEEK_HOLE) ?
	244	NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
	245	};
	246	struct nfs42_seek_res res;
	247	struct rpc_message msg = {
	248	.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
	249	.rpc_argp = &args,
	250	.rpc_resp = &res,
	251	};
	252	struct nfs_server *server = NFS_SERVER(inode);
	253	int status;
	254
878ffa9f	255	if (!nfs_server_capable(inode, NFS_CAP_SEEK))
1c6dcbe5 AS	256	return -ENOTSUPP;
1c6dcbe5 AS	257
4bdf87eb CH	258	status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
4bdf87eb CH	259	lock, FMODE_READ);
1c6dcbe5 AS	260	if (status)
	261	return status;
	262
	263	nfs_wb_all(inode);
	264	status = nfs4_call_sync(server->client, server, &msg,
	265	&args.seq_args, &res.seq_res, 0);
	266	if (status == -ENOTSUPP)
	267	server->caps &= ~NFS_CAP_SEEK;
	268	if (status)
	269	return status;
	270
	271	return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
	272	}
be3a5d23	273
bdcc2cd1 BF	274	loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
	275	{
	276	struct nfs_server *server = NFS_SERVER(file_inode(filep));
	277	struct nfs4_exception exception = { };
4bdf87eb	278	struct nfs_lock_context *lock;
306a5549	279	loff_t err;
bdcc2cd1	280
4bdf87eb CH	281	lock = nfs_get_lock_context(nfs_file_open_context(filep));
	282	if (IS_ERR(lock))
	283	return PTR_ERR(lock);
	284
	285	exception.inode = file_inode(filep);
	286	exception.state = lock->open_context->state;
	287
bdcc2cd1	288	do {
4bdf87eb	289	err = _nfs42_proc_llseek(filep, lock, offset, whence);
306a5549 BF	290	if (err >= 0)
306a5549 BF	291	break;
4bdf87eb CH	292	if (err == -ENOTSUPP) {
	293	err = -EOPNOTSUPP;
	294	break;
	295	}
bdcc2cd1 BF	296	err = nfs4_handle_exception(server, err, &exception);
	297	} while (exception.retry);
	298
4bdf87eb	299	nfs_put_lock_context(lock);
bdcc2cd1 BF	300	return err;
	301	}
	302
	303
1b4a4bd8 PT	304	static void
	305	nfs42_layoutstat_prepare(struct rpc_task task, void calldata)
	306	{
	307	struct nfs42_layoutstat_data *data = calldata;
	308	struct nfs_server *server = NFS_SERVER(data->args.inode);
	309
	310	nfs41_setup_sequence(nfs4_get_session(server), &data->args.seq_args,
	311	&data->res.seq_res, task);
	312	}
	313
	314	static void
	315	nfs42_layoutstat_done(struct rpc_task task, void calldata)
	316	{
	317	struct nfs42_layoutstat_data *data = calldata;
68d264cf PT	318	struct inode *inode = data->inode;
68d264cf PT	319	struct pnfs_layout_hdr *lo;
1b4a4bd8 PT	320
	321	if (!nfs4_sequence_done(task, &data->res.seq_res))
	322	return;
	323
6c5a0d89 TM	324	switch (task->tk_status) {
	325	case 0:
	326	break;
68d264cf PT	327	case -NFS4ERR_EXPIRED:
	328	case -NFS4ERR_STALE_STATEID:
	329	case -NFS4ERR_OLD_STATEID:
	330	case -NFS4ERR_BAD_STATEID:
	331	spin_lock(&inode->i_lock);
	332	lo = NFS_I(inode)->layout;
	333	if (lo && nfs4_stateid_match(&data->args.stateid,
	334	&lo->plh_stateid)) {
	335	LIST_HEAD(head);
	336
	337	/*
	338	* Mark the bad layout state as invalid, then retry
	339	* with the current stateid.
	340	*/
	341	set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
6d597e17	342	pnfs_mark_matching_lsegs_invalid(lo, &head, NULL, 0);
68d264cf PT	343	spin_unlock(&inode->i_lock);
	344	pnfs_free_lseg_list(&head);
	345	} else
	346	spin_unlock(&inode->i_lock);
	347	break;
6c5a0d89 TM	348	case -ENOTSUPP:
6c5a0d89 TM	349	case -EOPNOTSUPP:
68d264cf	350	NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
6c5a0d89	351	default:
68d264cf	352	break;
6c5a0d89	353	}
68d264cf PT	354
68d264cf PT	355	dprintk("%s server returns %d\n", __func__, task->tk_status);
1b4a4bd8 PT	356	}
	357
	358	static void
	359	nfs42_layoutstat_release(void *calldata)
	360	{
	361	struct nfs42_layoutstat_data *data = calldata;
8733408d PT	362	struct nfs_server *nfss = NFS_SERVER(data->args.inode);
	363
	364	if (nfss->pnfs_curr_ld->cleanup_layoutstats)
	365	nfss->pnfs_curr_ld->cleanup_layoutstats(data);
1b4a4bd8 PT	366
1b4a4bd8 PT	367	pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
1bfe3b25 PT	368	smp_mb__before_atomic();
	369	clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
	370	smp_mb__after_atomic();
1b4a4bd8 PT	371	nfs_iput_and_deactive(data->inode);
	372	kfree(data->args.devinfo);
	373	kfree(data);
	374	}
	375
be3a5d23	376	static const struct rpc_call_ops nfs42_layoutstat_ops = {
1b4a4bd8 PT	377	.rpc_call_prepare = nfs42_layoutstat_prepare,
	378	.rpc_call_done = nfs42_layoutstat_done,
	379	.rpc_release = nfs42_layoutstat_release,
be3a5d23 TM	380	};
	381
	382	int nfs42_proc_layoutstats_generic(struct nfs_server *server,
	383	struct nfs42_layoutstat_data *data)
	384	{
	385	struct rpc_message msg = {
	386	.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
	387	.rpc_argp = &data->args,
	388	.rpc_resp = &data->res,
	389	};
	390	struct rpc_task_setup task_setup = {
	391	.rpc_client = server->client,
	392	.rpc_message = &msg,
	393	.callback_ops = &nfs42_layoutstat_ops,
	394	.callback_data = data,
	395	.flags = RPC_TASK_ASYNC,
	396	};
	397	struct rpc_task *task;
	398
1b4a4bd8 PT	399	data->inode = nfs_igrab_and_active(data->args.inode);
	400	if (!data->inode) {
	401	nfs42_layoutstat_release(data);
	402	return -EAGAIN;
	403	}
be3a5d23 TM	404	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
	405	task = rpc_run_task(&task_setup);
	406	if (IS_ERR(task))
	407	return PTR_ERR(task);
	408	return 0;
	409	}
e5341f3a PT	410
e5341f3a PT	411	static int _nfs42_proc_clone(struct rpc_message msg, struct file src_f,
4bdf87eb CH	412	struct file dst_f, struct nfs_lock_context src_lock,
	413	struct nfs_lock_context *dst_lock, loff_t src_offset,
	414	loff_t dst_offset, loff_t count)
e5341f3a PT	415	{
	416	struct inode *src_inode = file_inode(src_f);
	417	struct inode *dst_inode = file_inode(dst_f);
	418	struct nfs_server *server = NFS_SERVER(dst_inode);
	419	struct nfs42_clone_args args = {
	420	.src_fh = NFS_FH(src_inode),
	421	.dst_fh = NFS_FH(dst_inode),
	422	.src_offset = src_offset,
	423	.dst_offset = dst_offset,
9494b2ce	424	.count = count,
e5341f3a PT	425	.dst_bitmask = server->cache_consistency_bitmask,
	426	};
	427	struct nfs42_clone_res res = {
	428	.server = server,
	429	};
	430	int status;
	431
	432	msg->rpc_argp = &args;
	433	msg->rpc_resp = &res;
	434
4bdf87eb CH	435	status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
4bdf87eb CH	436	src_lock, FMODE_READ);
e5341f3a PT	437	if (status)
	438	return status;
	439
4bdf87eb CH	440	status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
4bdf87eb CH	441	dst_lock, FMODE_WRITE);
e5341f3a PT	442	if (status)
	443	return status;
	444
	445	res.dst_fattr = nfs_alloc_fattr();
	446	if (!res.dst_fattr)
	447	return -ENOMEM;
	448
	449	status = nfs4_call_sync(server->client, server, msg,
	450	&args.seq_args, &res.seq_res, 0);
	451	if (status == 0)
	452	status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
	453
	454	kfree(res.dst_fattr);
	455	return status;
	456	}
	457
	458	int nfs42_proc_clone(struct file src_f, struct file dst_f,
	459	loff_t src_offset, loff_t dst_offset, loff_t count)
	460	{
	461	struct rpc_message msg = {
	462	.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
	463	};
	464	struct inode *inode = file_inode(src_f);
	465	struct nfs_server *server = NFS_SERVER(file_inode(src_f));
4bdf87eb CH	466	struct nfs_lock_context *src_lock;
	467	struct nfs_lock_context *dst_lock;
	468	struct nfs4_exception src_exception = { };
	469	struct nfs4_exception dst_exception = { };
	470	int err, err2;
e5341f3a PT	471
	472	if (!nfs_server_capable(inode, NFS_CAP_CLONE))
	473	return -EOPNOTSUPP;
	474
4bdf87eb CH	475	src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
	476	if (IS_ERR(src_lock))
	477	return PTR_ERR(src_lock);
	478
	479	src_exception.inode = file_inode(src_f);
	480	src_exception.state = src_lock->open_context->state;
	481
	482	dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
	483	if (IS_ERR(dst_lock)) {
	484	err = PTR_ERR(dst_lock);
	485	goto out_put_src_lock;
	486	}
	487
	488	dst_exception.inode = file_inode(dst_f);
	489	dst_exception.state = dst_lock->open_context->state;
	490
e5341f3a	491	do {
4bdf87eb CH	492	err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
4bdf87eb CH	493	src_offset, dst_offset, count);
e5341f3a PT	494	if (err == -ENOTSUPP \|\| err == -EOPNOTSUPP) {
e5341f3a PT	495	NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
4bdf87eb CH	496	err = -EOPNOTSUPP;
4bdf87eb CH	497	break;
e5341f3a	498	}
e5341f3a	499
4bdf87eb CH	500	err2 = nfs4_handle_exception(server, err, &src_exception);
	501	err = nfs4_handle_exception(server, err, &dst_exception);
	502	if (!err)
	503	err = err2;
	504	} while (src_exception.retry \|\| dst_exception.retry);
e5341f3a	505
4bdf87eb CH	506	nfs_put_lock_context(dst_lock);
	507	out_put_src_lock:
	508	nfs_put_lock_context(src_lock);
	509	return err;
e5341f3a	510	}