linux/fs/nfs/nfs42proc.c
Olga Kornievskaia e4648aa4f9 NFS recover from destination server reboot for copies
Mark the destination state to indicate a server-side copy is
happening. On detecting a reboot and recovering open state check
if any state is engaged in a server-side copy, if so, find the
copy and mark it and then signal the waiting thread. Upon wakeup,
if copy was marked then propage EAGAIN to the nfsd_copy_file_range
and restart the copy from scratch.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2018-08-13 17:04:23 -04:00

774 lines
20 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* 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 "nfs4session.h"
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_PROC
static int nfs42_do_offload_cancel_async(struct file *dst, nfs4_stateid *std);
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 int handle_async_copy(struct nfs42_copy_res *res,
struct nfs_server *server,
struct file *src,
struct file *dst,
nfs4_stateid *src_stateid)
{
struct nfs4_copy_state *copy;
int status = NFS4_OK;
bool found_pending = false;
struct nfs_open_context *ctx = nfs_file_open_context(dst);
spin_lock(&server->nfs_client->cl_lock);
list_for_each_entry(copy, &server->nfs_client->pending_cb_stateids,
copies) {
if (memcmp(&res->write_res.stateid, &copy->stateid,
NFS4_STATEID_SIZE))
continue;
found_pending = true;
list_del(&copy->copies);
break;
}
if (found_pending) {
spin_unlock(&server->nfs_client->cl_lock);
goto out;
}
copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
if (!copy) {
spin_unlock(&server->nfs_client->cl_lock);
return -ENOMEM;
}
memcpy(&copy->stateid, &res->write_res.stateid, NFS4_STATEID_SIZE);
init_completion(&copy->completion);
copy->parent_state = ctx->state;
list_add_tail(&copy->copies, &server->ss_copies);
spin_unlock(&server->nfs_client->cl_lock);
status = wait_for_completion_interruptible(&copy->completion);
spin_lock(&server->nfs_client->cl_lock);
list_del_init(&copy->copies);
spin_unlock(&server->nfs_client->cl_lock);
if (status == -ERESTARTSYS) {
goto out_cancel;
} else if (copy->flags) {
status = -EAGAIN;
goto out_cancel;
}
out:
res->write_res.count = copy->count;
memcpy(&res->write_res.verifier, &copy->verf, sizeof(copy->verf));
status = -copy->error;
kfree(copy);
return status;
out_cancel:
nfs42_do_offload_cancel_async(dst, &copy->stateid);
kfree(copy);
return status;
}
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_NOFS);
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;
}
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 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);
loff_t pos_src = args->src_pos;
loff_t pos_dst = args->dst_pos;
size_t count = args->count;
ssize_t 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;
res->commit_res.verf = NULL;
if (args->sync) {
res->commit_res.verf =
kzalloc(sizeof(struct nfs_writeverf), GFP_NOFS);
if (!res->commit_res.verf)
return -ENOMEM;
}
set_bit(NFS_CLNT_DST_SSC_COPY_STATE,
&dst_lock->open_context->state->flags);
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)
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, server, src, dst,
&args->src_stateid);
if (status)
return status;
}
if ((!res->synchronous || !args->sync) &&
res->write_res.verifier.committed != NFS_FILE_SYNC) {
status = process_copy_commit(dst, pos_dst, res);
if (status)
return status;
}
truncate_pagecache_range(dst_inode, pos_dst,
pos_dst + res->write_res.count);
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 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 = false,
};
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;
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.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);
inode_unlock(file_inode(dst));
if (err >= 0)
break;
if (err == -ENOTSUPP) {
err = -EOPNOTSUPP;
break;
} else if (err == -EAGAIN) {
dst_exception.retry = 1;
continue;
} else if (err == -NFS4ERR_OFFLOAD_NO_REQS && !args.sync) {
args.sync = true;
dst_exception.retry = 1;
continue;
}
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;
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_NOFS);
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 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 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:
break;
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;
}
}
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 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;
}