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reactos/base/services/nfsd/readwrite.c

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/* NFSv4.1 client for Windows
* Copyright © 2012 The Regents of the University of Michigan
*
* Olga Kornievskaia <aglo@umich.edu>
* Casey Bodley <cbodley@umich.edu>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* without any warranty; without even the implied warranty of merchantability
* or fitness for a particular purpose. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA
*/
#include <windows.h>
#include <stdio.h>
#include "nfs41_ops.h"
#include "name_cache.h"
#include "upcall.h"
#include "daemon_debug.h"
#include "util.h"
/* number of times to retry on write/commit verifier mismatch */
#define MAX_WRITE_RETRIES 6
const stateid4 special_read_stateid = {0xffffffff,
{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}};
static int parse_rw(unsigned char *buffer, uint32_t length, nfs41_upcall *upcall)
{
int status;
readwrite_upcall_args *args = &upcall->args.rw;
status = safe_read(&buffer, &length, &args->len, sizeof(args->len));
if (status) goto out;
status = safe_read(&buffer, &length, &args->offset, sizeof(args->offset));
if (status) goto out;
status = safe_read(&buffer, &length, &args->buffer, sizeof(args->buffer));
if (status) goto out;
dprintf(1, "parsing %s len=%lu offset=%llu buf=%p\n",
opcode2string(upcall->opcode), args->len, args->offset, args->buffer);
out:
return status;
}
/* NFS41_READ */
static int read_from_mds(
IN nfs41_upcall *upcall,
IN stateid_arg *stateid)
{
nfs41_session *session = upcall->state_ref->session;
nfs41_path_fh *file = &upcall->state_ref->file;
readwrite_upcall_args *args = &upcall->args.rw;
int status = 0;
bool_t eof;
unsigned char *p = args->buffer;
ULONG to_rcv = args->len, reloffset = 0, len = 0;
const uint32_t maxreadsize = max_read_size(session, &file->fh);
if (to_rcv > maxreadsize)
dprintf(1, "handle_nfs41_read: reading %d in chunks of %d\n",
to_rcv, maxreadsize);
while(to_rcv > 0) {
uint32_t bytes_read = 0, chunk = min(to_rcv, maxreadsize);
status = nfs41_read(session, file, stateid, args->offset + reloffset, chunk,
p, &bytes_read, &eof);
if (status == NFS4ERR_OPENMODE && !len) {
stateid->type = STATEID_SPECIAL;
memcpy(&stateid->stateid, &special_read_stateid, sizeof(stateid4));
continue;
} else if (status && !len) {
status = nfs_to_windows_error(status, ERROR_NET_WRITE_FAULT);
goto out;
}
p += bytes_read;
to_rcv -= bytes_read;
len += bytes_read;
args->offset += bytes_read;
if (status) {
status = NO_ERROR;
break;
}
if (eof) {
if (!len)
status = ERROR_HANDLE_EOF;
break;
}
}
out:
args->out_len = len;
return status;
}
static int read_from_pnfs(
IN nfs41_upcall *upcall,
IN stateid_arg *stateid)
{
readwrite_upcall_args *args = &upcall->args.rw;
pnfs_layout_state *layout;
enum pnfs_status pnfsstat;
int status = NO_ERROR;
if (pnfs_layout_state_open(upcall->state_ref, &layout)) {
status = ERROR_NOT_SUPPORTED;
goto out;
}
pnfsstat = pnfs_read(upcall->root_ref, upcall->state_ref, stateid, layout,
args->offset, args->len, args->buffer, &args->out_len);
switch (pnfsstat) {
case PNFS_SUCCESS:
break;
case PNFS_READ_EOF:
status = ERROR_HANDLE_EOF;
break;
default:
status = ERROR_READ_FAULT;
break;
}
out:
return status;
}
static int handle_read(nfs41_upcall *upcall)
{
readwrite_upcall_args *args = &upcall->args.rw;
stateid_arg stateid;
ULONG pnfs_bytes_read = 0;
int status = NO_ERROR;
nfs41_open_stateid_arg(upcall->state_ref, &stateid);
#ifdef PNFS_ENABLE_READ
status = read_from_pnfs(upcall, &stateid);
if (status == NO_ERROR || status == ERROR_HANDLE_EOF)
goto out;
if (args->out_len) {
pnfs_bytes_read = args->out_len;
args->out_len = 0;
args->offset += pnfs_bytes_read;
args->buffer += pnfs_bytes_read;
args->len -= pnfs_bytes_read;
}
#endif
status = read_from_mds(upcall, &stateid);
args->out_len += pnfs_bytes_read;
out:
return status;
}
/* NFS41_WRITE */
static int write_to_mds(
IN nfs41_upcall *upcall,
IN stateid_arg *stateid)
{
nfs41_session *session = upcall->state_ref->session;
nfs41_path_fh *file = &upcall->state_ref->file;
readwrite_upcall_args *args = &upcall->args.rw;
nfs41_write_verf verf;
enum stable_how4 stable, committed;
unsigned char *p;
const uint32_t maxwritesize = max_write_size(session, &file->fh);
uint32_t to_send, reloffset, len;
int status = 0;
/* on write verifier mismatch, retry N times before failing */
uint32_t retries = MAX_WRITE_RETRIES;
nfs41_file_info info = { 0 };
retry_write:
p = args->buffer;
to_send = args->len;
reloffset = 0;
len = 0;
stable = to_send <= maxwritesize ? FILE_SYNC4 : UNSTABLE4;
committed = FILE_SYNC4;
if (to_send > maxwritesize)
dprintf(1, "handle_nfs41_write: writing %d in chunks of %d\n",
to_send, maxwritesize);
while(to_send > 0) {
uint32_t bytes_written = 0, chunk = min(to_send, maxwritesize);
status = nfs41_write(session, file, stateid, p, chunk,
args->offset + reloffset, stable, &bytes_written, &verf, &info);
if (status && !len)
goto out;
p += bytes_written;
to_send -= bytes_written;
len += bytes_written;
reloffset += bytes_written;
if (status) {
status = 0;
break;
}
if (!verify_write(&verf, &committed)) {
if (retries--) goto retry_write;
goto out_verify_failed;
}
}
if (committed != FILE_SYNC4) {
dprintf(1, "sending COMMIT for offset=%d and len=%d\n", args->offset, len);
status = nfs41_commit(session, file, args->offset, len, 1, &verf, &info);
if (status)
goto out;
if (!verify_commit(&verf)) {
if (retries--) goto retry_write;
goto out_verify_failed;
}
} else if (stable == UNSTABLE4) {
nfs41_file_info info;
bitmap4 attr_request;
nfs41_superblock_getattr_mask(file->fh.superblock, &attr_request);
status = nfs41_getattr(session, file, &attr_request, &info);
if (status)
goto out;
}
args->ctime = info.change;
out:
args->out_len = len;
return nfs_to_windows_error(status, ERROR_NET_WRITE_FAULT);
out_verify_failed:
len = 0;
status = NFS4ERR_IO;
goto out;
}
static int write_to_pnfs(
IN nfs41_upcall *upcall,
IN stateid_arg *stateid)
{
readwrite_upcall_args *args = &upcall->args.rw;
pnfs_layout_state *layout;
int status = NO_ERROR;
nfs41_file_info info = { 0 };
if (pnfs_layout_state_open(upcall->state_ref, &layout)) {
status = ERROR_NOT_SUPPORTED;
goto out;
}
if (pnfs_write(upcall->root_ref, upcall->state_ref, stateid, layout,
args->offset, args->len, args->buffer, &args->out_len, &info)) {
status = ERROR_WRITE_FAULT;
goto out;
}
args->ctime = info.change;
out:
return status;
}
static int handle_write(nfs41_upcall *upcall)
{
readwrite_upcall_args *args = &upcall->args.rw;
stateid_arg stateid;
uint32_t pnfs_bytes_written = 0;
int status;
nfs41_open_stateid_arg(upcall->state_ref, &stateid);
#ifdef PNFS_ENABLE_WRITE
status = write_to_pnfs(upcall, &stateid);
if (args->out_len) {
pnfs_bytes_written = args->out_len;
args->out_len = 0;
args->offset += pnfs_bytes_written;
args->buffer += pnfs_bytes_written;
args->len -= pnfs_bytes_written;
if (args->len == 0)
goto out;
}
#endif
status = write_to_mds(upcall, &stateid);
out:
args->out_len += pnfs_bytes_written;
return status;
}
static int marshall_rw(unsigned char *buffer, uint32_t *length, nfs41_upcall *upcall)
{
readwrite_upcall_args *args = &upcall->args.rw;
int status;
status = safe_write(&buffer, length, &args->out_len, sizeof(args->out_len));
if (status) goto out;
status = safe_write(&buffer, length, &args->ctime, sizeof(args->ctime));
out:
return status;
}
const nfs41_upcall_op nfs41_op_read = {
parse_rw,
handle_read,
marshall_rw
};
const nfs41_upcall_op nfs41_op_write = {
parse_rw,
handle_write,
marshall_rw
};
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