linux/fs/nfsd/nfs3proc.c

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License cleanup: add SPDX GPL-2.0 license identifier to files with no license Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 14:07:57 +00:00
// SPDX-License-Identifier: GPL-2.0
/*
* Process version 3 NFS requests.
*
* Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/magic.h>
#include "cache.h"
#include "xdr3.h"
#include "vfs.h"
#define NFSDDBG_FACILITY NFSDDBG_PROC
#define RETURN_STATUS(st) { resp->status = (st); return (st); }
static int nfs3_ftypes[] = {
0, /* NF3NON */
S_IFREG, /* NF3REG */
S_IFDIR, /* NF3DIR */
S_IFBLK, /* NF3BLK */
S_IFCHR, /* NF3CHR */
S_IFLNK, /* NF3LNK */
S_IFSOCK, /* NF3SOCK */
S_IFIFO, /* NF3FIFO */
};
/*
* NULL call.
*/
static __be32
nfsd3_proc_null(struct svc_rqst *rqstp)
{
return nfs_ok;
}
/*
* Get a file's attributes
*/
static __be32
nfsd3_proc_getattr(struct svc_rqst *rqstp)
{
struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd3_attrstat *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: GETATTR(3) %s\n",
SVCFH_fmt(&argp->fh));
fh_copy(&resp->fh, &argp->fh);
nfserr = fh_verify(rqstp, &resp->fh, 0,
NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
if (nfserr)
RETURN_STATUS(nfserr);
nfserr = fh_getattr(&resp->fh, &resp->stat);
RETURN_STATUS(nfserr);
}
/*
* Set a file's attributes
*/
static __be32
nfsd3_proc_setattr(struct svc_rqst *rqstp)
{
struct nfsd3_sattrargs *argp = rqstp->rq_argp;
struct nfsd3_attrstat *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: SETATTR(3) %s\n",
SVCFH_fmt(&argp->fh));
fh_copy(&resp->fh, &argp->fh);
nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,
argp->check_guard, argp->guardtime);
RETURN_STATUS(nfserr);
}
/*
* Look up a path name component
*/
static __be32
nfsd3_proc_lookup(struct svc_rqst *rqstp)
{
struct nfsd3_diropargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: LOOKUP(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
fh_copy(&resp->dirfh, &argp->fh);
fh_init(&resp->fh, NFS3_FHSIZE);
nfserr = nfsd_lookup(rqstp, &resp->dirfh,
argp->name,
argp->len,
&resp->fh);
RETURN_STATUS(nfserr);
}
/*
* Check file access
*/
static __be32
nfsd3_proc_access(struct svc_rqst *rqstp)
{
struct nfsd3_accessargs *argp = rqstp->rq_argp;
struct nfsd3_accessres *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: ACCESS(3) %s 0x%x\n",
SVCFH_fmt(&argp->fh),
argp->access);
fh_copy(&resp->fh, &argp->fh);
resp->access = argp->access;
nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
RETURN_STATUS(nfserr);
}
/*
* Read a symlink.
*/
static __be32
nfsd3_proc_readlink(struct svc_rqst *rqstp)
{
struct nfsd3_readlinkargs *argp = rqstp->rq_argp;
struct nfsd3_readlinkres *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
/* Read the symlink. */
fh_copy(&resp->fh, &argp->fh);
resp->len = NFS3_MAXPATHLEN;
nfserr = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len);
RETURN_STATUS(nfserr);
}
/*
* Read a portion of a file.
*/
static __be32
nfsd3_proc_read(struct svc_rqst *rqstp)
{
struct nfsd3_readargs *argp = rqstp->rq_argp;
struct nfsd3_readres *resp = rqstp->rq_resp;
__be32 nfserr;
u32 max_blocksize = svc_max_payload(rqstp);
unsigned long cnt = min(argp->count, max_blocksize);
dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
SVCFH_fmt(&argp->fh),
(unsigned long) argp->count,
(unsigned long long) argp->offset);
/* Obtain buffer pointer for payload.
* 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
* + 1 (xdr opaque byte count) = 26
*/
resp->count = cnt;
RPC: add wrapper for svc_reserve to account for checksum When the kernel calls svc_reserve to downsize the expected size of an RPC reply, it fails to account for the possibility of a checksum at the end of the packet. If a client mounts a NFSv2/3 with sec=krb5i/p, and does I/O then you'll generally see messages similar to this in the server's ring buffer: RPC request reserved 164 but used 208 While I was never able to verify it, I suspect that this problem is also the root cause of some oopses I've seen under these conditions: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=227726 This is probably also a problem for other sec= types and for NFSv4. The large reserved size for NFSv4 compound packets seems to generally paper over the problem, however. This patch adds a wrapper for svc_reserve that accounts for the possibility of a checksum. It also fixes up the appropriate callers of svc_reserve to call the wrapper. For now, it just uses a hardcoded value that I determined via testing. That value may need to be revised upward as things change, or we may want to eventually add a new auth_op that attempts to calculate this somehow. Unfortunately, there doesn't seem to be a good way to reliably determine the expected checksum length prior to actually calculating it, particularly with schemes like spkm3. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Neil Brown <neilb@suse.de> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Acked-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-09 09:34:50 +00:00
svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
fh_copy(&resp->fh, &argp->fh);
nfserr = nfsd_read(rqstp, &resp->fh,
argp->offset,
rqstp->rq_vec, argp->vlen,
&resp->count,
&resp->eof);
RETURN_STATUS(nfserr);
}
/*
* Write data to a file
*/
static __be32
nfsd3_proc_write(struct svc_rqst *rqstp)
{
struct nfsd3_writeargs *argp = rqstp->rq_argp;
struct nfsd3_writeres *resp = rqstp->rq_resp;
__be32 nfserr;
unsigned long cnt = argp->len;
NFSD: Clean up legacy NFS WRITE argument XDR decoders Move common code in NFSD's legacy NFS WRITE decoders into a helper. The immediate benefit is reduction of code duplication and some nice micro-optimizations (see below). In the long term, this helper can perform a per-transport call-out to fill the rq_vec (say, using RDMA Reads). The legacy WRITE decoders and procs are changed to work like NFSv4, which constructs the rq_vec just before it is about to call vfs_writev. Why? Calling a transport call-out from the proc instead of the XDR decoder means that the incoming FH can be resolved to a particular filesystem and file. This would allow pages from the backing file to be presented to the transport to be filled, rather than presenting anonymous pages and copying or flipping them into the file's page cache later. I also prefer using the pages in rq_arg.pages, instead of pulling the data pages directly out of the rqstp::rq_pages array. This is currently the way the NFSv3 write decoder works, but the other two do not seem to take this approach. Fixing this removes the only reference to rq_pages found in NFSD, eliminating an NFSD assumption about how transports use the pages in rq_pages. Lastly, avoid setting up the first element of rq_vec as a zero- length buffer. This happens with an RDMA transport when a normal Read chunk is present because the data payload is in rq_arg's page list (none of it is in the head buffer). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2018-03-27 14:54:07 +00:00
unsigned int nvecs;
dprintk("nfsd: WRITE(3) %s %d bytes at %Lu%s\n",
SVCFH_fmt(&argp->fh),
argp->len,
(unsigned long long) argp->offset,
argp->stable? " stable" : "");
fh_copy(&resp->fh, &argp->fh);
resp->committed = argp->stable;
nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
&argp->first, cnt);
NFSD: Clean up legacy NFS WRITE argument XDR decoders Move common code in NFSD's legacy NFS WRITE decoders into a helper. The immediate benefit is reduction of code duplication and some nice micro-optimizations (see below). In the long term, this helper can perform a per-transport call-out to fill the rq_vec (say, using RDMA Reads). The legacy WRITE decoders and procs are changed to work like NFSv4, which constructs the rq_vec just before it is about to call vfs_writev. Why? Calling a transport call-out from the proc instead of the XDR decoder means that the incoming FH can be resolved to a particular filesystem and file. This would allow pages from the backing file to be presented to the transport to be filled, rather than presenting anonymous pages and copying or flipping them into the file's page cache later. I also prefer using the pages in rq_arg.pages, instead of pulling the data pages directly out of the rqstp::rq_pages array. This is currently the way the NFSv3 write decoder works, but the other two do not seem to take this approach. Fixing this removes the only reference to rq_pages found in NFSD, eliminating an NFSD assumption about how transports use the pages in rq_pages. Lastly, avoid setting up the first element of rq_vec as a zero- length buffer. This happens with an RDMA transport when a normal Read chunk is present because the data payload is in rq_arg's page list (none of it is in the head buffer). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2018-03-27 14:54:07 +00:00
if (!nvecs)
RETURN_STATUS(nfserr_io);
nfserr = nfsd_write(rqstp, &resp->fh, argp->offset,
NFSD: Clean up legacy NFS WRITE argument XDR decoders Move common code in NFSD's legacy NFS WRITE decoders into a helper. The immediate benefit is reduction of code duplication and some nice micro-optimizations (see below). In the long term, this helper can perform a per-transport call-out to fill the rq_vec (say, using RDMA Reads). The legacy WRITE decoders and procs are changed to work like NFSv4, which constructs the rq_vec just before it is about to call vfs_writev. Why? Calling a transport call-out from the proc instead of the XDR decoder means that the incoming FH can be resolved to a particular filesystem and file. This would allow pages from the backing file to be presented to the transport to be filled, rather than presenting anonymous pages and copying or flipping them into the file's page cache later. I also prefer using the pages in rq_arg.pages, instead of pulling the data pages directly out of the rqstp::rq_pages array. This is currently the way the NFSv3 write decoder works, but the other two do not seem to take this approach. Fixing this removes the only reference to rq_pages found in NFSD, eliminating an NFSD assumption about how transports use the pages in rq_pages. Lastly, avoid setting up the first element of rq_vec as a zero- length buffer. This happens with an RDMA transport when a normal Read chunk is present because the data payload is in rq_arg's page list (none of it is in the head buffer). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2018-03-27 14:54:07 +00:00
rqstp->rq_vec, nvecs, &cnt,
resp->committed, resp->verf);
resp->count = cnt;
RETURN_STATUS(nfserr);
}
/*
* With NFSv3, CREATE processing is a lot easier than with NFSv2.
* At least in theory; we'll see how it fares in practice when the
* first reports about SunOS compatibility problems start to pour in...
*/
static __be32
nfsd3_proc_create(struct svc_rqst *rqstp)
{
struct nfsd3_createargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
svc_fh *dirfhp, *newfhp = NULL;
struct iattr *attr;
__be32 nfserr;
dprintk("nfsd: CREATE(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
dirfhp = fh_copy(&resp->dirfh, &argp->fh);
newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
attr = &argp->attrs;
/* Unfudge the mode bits */
attr->ia_mode &= ~S_IFMT;
if (!(attr->ia_valid & ATTR_MODE)) {
attr->ia_valid |= ATTR_MODE;
attr->ia_mode = S_IFREG;
} else {
attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG;
}
/* Now create the file and set attributes */
nfserr = do_nfsd_create(rqstp, dirfhp, argp->name, argp->len,
attr, newfhp,
argp->createmode, (u32 *)argp->verf, NULL, NULL);
RETURN_STATUS(nfserr);
}
/*
* Make directory. This operation is not idempotent.
*/
static __be32
nfsd3_proc_mkdir(struct svc_rqst *rqstp)
{
struct nfsd3_createargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: MKDIR(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
argp->attrs.ia_valid &= ~ATTR_SIZE;
fh_copy(&resp->dirfh, &argp->fh);
fh_init(&resp->fh, NFS3_FHSIZE);
nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
&argp->attrs, S_IFDIR, 0, &resp->fh);
fh_unlock(&resp->dirfh);
RETURN_STATUS(nfserr);
}
static __be32
nfsd3_proc_symlink(struct svc_rqst *rqstp)
{
struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
__be32 nfserr;
if (argp->tlen == 0)
RETURN_STATUS(nfserr_inval);
if (argp->tlen > NFS3_MAXPATHLEN)
RETURN_STATUS(nfserr_nametoolong);
argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
page_address(rqstp->rq_arg.pages[0]),
argp->tlen);
if (IS_ERR(argp->tname))
RETURN_STATUS(nfserrno(PTR_ERR(argp->tname)));
dprintk("nfsd: SYMLINK(3) %s %.*s -> %.*s\n",
SVCFH_fmt(&argp->ffh),
argp->flen, argp->fname,
argp->tlen, argp->tname);
fh_copy(&resp->dirfh, &argp->ffh);
fh_init(&resp->fh, NFS3_FHSIZE);
nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen,
argp->tname, &resp->fh);
kfree(argp->tname);
RETURN_STATUS(nfserr);
}
/*
* Make socket/fifo/device.
*/
static __be32
nfsd3_proc_mknod(struct svc_rqst *rqstp)
{
struct nfsd3_mknodargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
__be32 nfserr;
int type;
dev_t rdev = 0;
dprintk("nfsd: MKNOD(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
fh_copy(&resp->dirfh, &argp->fh);
fh_init(&resp->fh, NFS3_FHSIZE);
if (argp->ftype == 0 || argp->ftype >= NF3BAD)
RETURN_STATUS(nfserr_inval);
if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
rdev = MKDEV(argp->major, argp->minor);
if (MAJOR(rdev) != argp->major ||
MINOR(rdev) != argp->minor)
RETURN_STATUS(nfserr_inval);
} else
if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO)
RETURN_STATUS(nfserr_inval);
type = nfs3_ftypes[argp->ftype];
nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
&argp->attrs, type, rdev, &resp->fh);
fh_unlock(&resp->dirfh);
RETURN_STATUS(nfserr);
}
/*
* Remove file/fifo/socket etc.
*/
static __be32
nfsd3_proc_remove(struct svc_rqst *rqstp)
{
struct nfsd3_diropargs *argp = rqstp->rq_argp;
struct nfsd3_attrstat *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: REMOVE(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
/* Unlink. -S_IFDIR means file must not be a directory */
fh_copy(&resp->fh, &argp->fh);
nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len);
fh_unlock(&resp->fh);
RETURN_STATUS(nfserr);
}
/*
* Remove a directory
*/
static __be32
nfsd3_proc_rmdir(struct svc_rqst *rqstp)
{
struct nfsd3_diropargs *argp = rqstp->rq_argp;
struct nfsd3_attrstat *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: RMDIR(3) %s %.*s\n",
SVCFH_fmt(&argp->fh),
argp->len,
argp->name);
fh_copy(&resp->fh, &argp->fh);
nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len);
fh_unlock(&resp->fh);
RETURN_STATUS(nfserr);
}
static __be32
nfsd3_proc_rename(struct svc_rqst *rqstp)
{
struct nfsd3_renameargs *argp = rqstp->rq_argp;
struct nfsd3_renameres *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: RENAME(3) %s %.*s ->\n",
SVCFH_fmt(&argp->ffh),
argp->flen,
argp->fname);
dprintk("nfsd: -> %s %.*s\n",
SVCFH_fmt(&argp->tfh),
argp->tlen,
argp->tname);
fh_copy(&resp->ffh, &argp->ffh);
fh_copy(&resp->tfh, &argp->tfh);
nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
&resp->tfh, argp->tname, argp->tlen);
RETURN_STATUS(nfserr);
}
static __be32
nfsd3_proc_link(struct svc_rqst *rqstp)
{
struct nfsd3_linkargs *argp = rqstp->rq_argp;
struct nfsd3_linkres *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: LINK(3) %s ->\n",
SVCFH_fmt(&argp->ffh));
dprintk("nfsd: -> %s %.*s\n",
SVCFH_fmt(&argp->tfh),
argp->tlen,
argp->tname);
fh_copy(&resp->fh, &argp->ffh);
fh_copy(&resp->tfh, &argp->tfh);
nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
&resp->fh);
RETURN_STATUS(nfserr);
}
/*
* Read a portion of a directory.
*/
static __be32
nfsd3_proc_readdir(struct svc_rqst *rqstp)
{
struct nfsd3_readdirargs *argp = rqstp->rq_argp;
struct nfsd3_readdirres *resp = rqstp->rq_resp;
__be32 nfserr;
int count = 0;
struct page **p;
caddr_t page_addr = NULL;
dprintk("nfsd: READDIR(3) %s %d bytes at %d\n",
SVCFH_fmt(&argp->fh),
argp->count, (u32) argp->cookie);
/* Make sure we've room for the NULL ptr & eof flag, and shrink to
* client read size */
count = (argp->count >> 2) - 2;
/* Read directory and encode entries on the fly */
fh_copy(&resp->fh, &argp->fh);
resp->buflen = count;
resp->common.err = nfs_ok;
resp->buffer = argp->buffer;
resp->rqstp = rqstp;
nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie,
&resp->common, nfs3svc_encode_entry);
memcpy(resp->verf, argp->verf, 8);
count = 0;
for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
page_addr = page_address(*p);
if (((caddr_t)resp->buffer >= page_addr) &&
((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
count += (caddr_t)resp->buffer - page_addr;
break;
}
count += PAGE_SIZE;
}
resp->count = count >> 2;
nfsd: fix memory corruption caused by readdir If the result of an NFSv3 readdir{,plus} request results in the "offset" on one entry having to be split across 2 pages, and is sized so that the next directory entry doesn't fit in the requested size, then memory corruption can happen. When encode_entry() is called after encoding the last entry that fits, it notices that ->offset and ->offset1 are set, and so stores the offset value in the two pages as required. It clears ->offset1 but *does not* clear ->offset. Normally this omission doesn't matter as encode_entry_baggage() will be called, and will set ->offset to a suitable value (not on a page boundary). But in the case where cd->buflen < elen and nfserr_toosmall is returned, ->offset is not reset. This means that nfsd3proc_readdirplus will see ->offset with a value 4 bytes before the end of a page, and ->offset1 set to NULL. It will try to write 8bytes to ->offset. If we are lucky, the next page will be read-only, and the system will BUG: unable to handle kernel paging request at... If we are unlucky, some innocent page will have the first 4 bytes corrupted. nfsd3proc_readdir() doesn't even check for ->offset1, it just blindly writes 8 bytes to the offset wherever it is. Fix this by clearing ->offset after it is used, and copying the ->offset handling code from nfsd3_proc_readdirplus into nfsd3_proc_readdir. (Note that the commit hash in the Fixes tag is from the 'history' tree - this bug predates git). Fixes: 0b1d57cf7654 ("[PATCH] kNFSd: Fix nfs3 dentry encoding") Fixes-URL: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=0b1d57cf7654 Cc: stable@vger.kernel.org (v2.6.12+) Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2019-03-04 03:08:22 +00:00
if (resp->offset) {
loff_t offset = argp->cookie;
if (unlikely(resp->offset1)) {
/* we ended up with offset on a page boundary */
*resp->offset = htonl(offset >> 32);
*resp->offset1 = htonl(offset & 0xffffffff);
resp->offset1 = NULL;
} else {
xdr_encode_hyper(resp->offset, offset);
}
resp->offset = NULL;
}
RETURN_STATUS(nfserr);
}
/*
* Read a portion of a directory, including file handles and attrs.
* For now, we choose to ignore the dircount parameter.
*/
static __be32
nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
{
struct nfsd3_readdirargs *argp = rqstp->rq_argp;
struct nfsd3_readdirres *resp = rqstp->rq_resp;
__be32 nfserr;
int count = 0;
loff_t offset;
struct page **p;
caddr_t page_addr = NULL;
dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
SVCFH_fmt(&argp->fh),
argp->count, (u32) argp->cookie);
/* Convert byte count to number of words (i.e. >> 2),
* and reserve room for the NULL ptr & eof flag (-2 words) */
resp->count = (argp->count >> 2) - 2;
/* Read directory and encode entries on the fly */
fh_copy(&resp->fh, &argp->fh);
resp->common.err = nfs_ok;
resp->buffer = argp->buffer;
resp->buflen = resp->count;
resp->rqstp = rqstp;
offset = argp->cookie;
nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
if (nfserr)
RETURN_STATUS(nfserr);
if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
RETURN_STATUS(nfserr_notsupp);
nfserr = nfsd_readdir(rqstp, &resp->fh,
&offset,
&resp->common,
nfs3svc_encode_entry_plus);
memcpy(resp->verf, argp->verf, 8);
for (p = rqstp->rq_respages + 1; p < rqstp->rq_next_page; p++) {
page_addr = page_address(*p);
if (((caddr_t)resp->buffer >= page_addr) &&
((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) {
count += (caddr_t)resp->buffer - page_addr;
break;
}
count += PAGE_SIZE;
}
resp->count = count >> 2;
if (resp->offset) {
if (unlikely(resp->offset1)) {
/* we ended up with offset on a page boundary */
*resp->offset = htonl(offset >> 32);
*resp->offset1 = htonl(offset & 0xffffffff);
resp->offset1 = NULL;
} else {
xdr_encode_hyper(resp->offset, offset);
}
nfsd: fix memory corruption caused by readdir If the result of an NFSv3 readdir{,plus} request results in the "offset" on one entry having to be split across 2 pages, and is sized so that the next directory entry doesn't fit in the requested size, then memory corruption can happen. When encode_entry() is called after encoding the last entry that fits, it notices that ->offset and ->offset1 are set, and so stores the offset value in the two pages as required. It clears ->offset1 but *does not* clear ->offset. Normally this omission doesn't matter as encode_entry_baggage() will be called, and will set ->offset to a suitable value (not on a page boundary). But in the case where cd->buflen < elen and nfserr_toosmall is returned, ->offset is not reset. This means that nfsd3proc_readdirplus will see ->offset with a value 4 bytes before the end of a page, and ->offset1 set to NULL. It will try to write 8bytes to ->offset. If we are lucky, the next page will be read-only, and the system will BUG: unable to handle kernel paging request at... If we are unlucky, some innocent page will have the first 4 bytes corrupted. nfsd3proc_readdir() doesn't even check for ->offset1, it just blindly writes 8 bytes to the offset wherever it is. Fix this by clearing ->offset after it is used, and copying the ->offset handling code from nfsd3_proc_readdirplus into nfsd3_proc_readdir. (Note that the commit hash in the Fixes tag is from the 'history' tree - this bug predates git). Fixes: 0b1d57cf7654 ("[PATCH] kNFSd: Fix nfs3 dentry encoding") Fixes-URL: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=0b1d57cf7654 Cc: stable@vger.kernel.org (v2.6.12+) Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2019-03-04 03:08:22 +00:00
resp->offset = NULL;
}
RETURN_STATUS(nfserr);
}
/*
* Get file system stats
*/
static __be32
nfsd3_proc_fsstat(struct svc_rqst *rqstp)
{
struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd3_fsstatres *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: FSSTAT(3) %s\n",
SVCFH_fmt(&argp->fh));
nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
fh_put(&argp->fh);
RETURN_STATUS(nfserr);
}
/*
* Get file system info
*/
static __be32
nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
{
struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd3_fsinfores *resp = rqstp->rq_resp;
__be32 nfserr;
u32 max_blocksize = svc_max_payload(rqstp);
dprintk("nfsd: FSINFO(3) %s\n",
SVCFH_fmt(&argp->fh));
resp->f_rtmax = max_blocksize;
resp->f_rtpref = max_blocksize;
resp->f_rtmult = PAGE_SIZE;
resp->f_wtmax = max_blocksize;
resp->f_wtpref = max_blocksize;
resp->f_wtmult = PAGE_SIZE;
resp->f_dtpref = max_blocksize;
resp->f_maxfilesize = ~(u32) 0;
resp->f_properties = NFS3_FSF_DEFAULT;
nfserr = fh_verify(rqstp, &argp->fh, 0,
NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
/* Check special features of the file system. May request
* different read/write sizes for file systems known to have
* problems with large blocks */
if (nfserr == 0) {
struct super_block *sb = argp->fh.fh_dentry->d_sb;
/* Note that we don't care for remote fs's here */
if (sb->s_magic == MSDOS_SUPER_MAGIC) {
resp->f_properties = NFS3_FSF_BILLYBOY;
}
resp->f_maxfilesize = sb->s_maxbytes;
}
fh_put(&argp->fh);
RETURN_STATUS(nfserr);
}
/*
* Get pathconf info for the specified file
*/
static __be32
nfsd3_proc_pathconf(struct svc_rqst *rqstp)
{
struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd3_pathconfres *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: PATHCONF(3) %s\n",
SVCFH_fmt(&argp->fh));
/* Set default pathconf */
resp->p_link_max = 255; /* at least */
resp->p_name_max = 255; /* at least */
resp->p_no_trunc = 0;
resp->p_chown_restricted = 1;
resp->p_case_insensitive = 0;
resp->p_case_preserving = 1;
nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
if (nfserr == 0) {
struct super_block *sb = argp->fh.fh_dentry->d_sb;
/* Note that we don't care for remote fs's here */
switch (sb->s_magic) {
case EXT2_SUPER_MAGIC:
resp->p_link_max = EXT2_LINK_MAX;
resp->p_name_max = EXT2_NAME_LEN;
break;
case MSDOS_SUPER_MAGIC:
resp->p_case_insensitive = 1;
resp->p_case_preserving = 0;
break;
}
}
fh_put(&argp->fh);
RETURN_STATUS(nfserr);
}
/*
* Commit a file (range) to stable storage.
*/
static __be32
nfsd3_proc_commit(struct svc_rqst *rqstp)
{
struct nfsd3_commitargs *argp = rqstp->rq_argp;
struct nfsd3_commitres *resp = rqstp->rq_resp;
__be32 nfserr;
dprintk("nfsd: COMMIT(3) %s %u@%Lu\n",
SVCFH_fmt(&argp->fh),
argp->count,
(unsigned long long) argp->offset);
if (argp->offset > NFS_OFFSET_MAX)
RETURN_STATUS(nfserr_inval);
fh_copy(&resp->fh, &argp->fh);
nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count,
resp->verf);
RETURN_STATUS(nfserr);
}
/*
* NFSv3 Server procedures.
* Only the results of non-idempotent operations are cached.
*/
#define nfs3svc_decode_fhandleargs nfs3svc_decode_fhandle
#define nfs3svc_encode_attrstatres nfs3svc_encode_attrstat
#define nfs3svc_encode_wccstatres nfs3svc_encode_wccstat
#define nfsd3_mkdirargs nfsd3_createargs
#define nfsd3_readdirplusargs nfsd3_readdirargs
#define nfsd3_fhandleargs nfsd_fhandle
#define nfsd3_fhandleres nfsd3_attrstat
#define nfsd3_attrstatres nfsd3_attrstat
#define nfsd3_wccstatres nfsd3_attrstat
#define nfsd3_createres nfsd3_diropres
#define nfsd3_voidres nfsd3_voidargs
struct nfsd3_voidargs { int dummy; };
#define ST 1 /* status*/
#define FH 17 /* filehandle with length */
#define AT 21 /* attributes */
#define pAT (1+AT) /* post attributes - conditional */
#define WC (7+pAT) /* WCC attributes */
static const struct svc_procedure nfsd_procedures3[22] = {
[NFS3PROC_NULL] = {
.pc_func = nfsd3_proc_null,
.pc_encode = nfs3svc_encode_voidres,
.pc_argsize = sizeof(struct nfsd3_voidargs),
.pc_ressize = sizeof(struct nfsd3_voidres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST,
},
[NFS3PROC_GETATTR] = {
.pc_func = nfsd3_proc_getattr,
.pc_decode = nfs3svc_decode_fhandleargs,
.pc_encode = nfs3svc_encode_attrstatres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_fhandleargs),
.pc_ressize = sizeof(struct nfsd3_attrstatres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+AT,
},
[NFS3PROC_SETATTR] = {
.pc_func = nfsd3_proc_setattr,
.pc_decode = nfs3svc_decode_sattrargs,
.pc_encode = nfs3svc_encode_wccstatres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_sattrargs),
.pc_ressize = sizeof(struct nfsd3_wccstatres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC,
},
[NFS3PROC_LOOKUP] = {
.pc_func = nfsd3_proc_lookup,
.pc_decode = nfs3svc_decode_diropargs,
.pc_encode = nfs3svc_encode_diropres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_diropargs),
.pc_ressize = sizeof(struct nfsd3_diropres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+FH+pAT+pAT,
},
[NFS3PROC_ACCESS] = {
.pc_func = nfsd3_proc_access,
.pc_decode = nfs3svc_decode_accessargs,
.pc_encode = nfs3svc_encode_accessres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_accessargs),
.pc_ressize = sizeof(struct nfsd3_accessres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+1,
},
[NFS3PROC_READLINK] = {
.pc_func = nfsd3_proc_readlink,
.pc_decode = nfs3svc_decode_readlinkargs,
.pc_encode = nfs3svc_encode_readlinkres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_readlinkargs),
.pc_ressize = sizeof(struct nfsd3_readlinkres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
},
[NFS3PROC_READ] = {
.pc_func = nfsd3_proc_read,
.pc_decode = nfs3svc_decode_readargs,
.pc_encode = nfs3svc_encode_readres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_readargs),
.pc_ressize = sizeof(struct nfsd3_readres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
},
[NFS3PROC_WRITE] = {
.pc_func = nfsd3_proc_write,
.pc_decode = nfs3svc_decode_writeargs,
.pc_encode = nfs3svc_encode_writeres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_writeargs),
.pc_ressize = sizeof(struct nfsd3_writeres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC+4,
},
[NFS3PROC_CREATE] = {
.pc_func = nfsd3_proc_create,
.pc_decode = nfs3svc_decode_createargs,
.pc_encode = nfs3svc_encode_createres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_createargs),
.pc_ressize = sizeof(struct nfsd3_createres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+(1+FH+pAT)+WC,
},
[NFS3PROC_MKDIR] = {
.pc_func = nfsd3_proc_mkdir,
.pc_decode = nfs3svc_decode_mkdirargs,
.pc_encode = nfs3svc_encode_createres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_mkdirargs),
.pc_ressize = sizeof(struct nfsd3_createres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+(1+FH+pAT)+WC,
},
[NFS3PROC_SYMLINK] = {
.pc_func = nfsd3_proc_symlink,
.pc_decode = nfs3svc_decode_symlinkargs,
.pc_encode = nfs3svc_encode_createres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_symlinkargs),
.pc_ressize = sizeof(struct nfsd3_createres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+(1+FH+pAT)+WC,
},
[NFS3PROC_MKNOD] = {
.pc_func = nfsd3_proc_mknod,
.pc_decode = nfs3svc_decode_mknodargs,
.pc_encode = nfs3svc_encode_createres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_mknodargs),
.pc_ressize = sizeof(struct nfsd3_createres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+(1+FH+pAT)+WC,
},
[NFS3PROC_REMOVE] = {
.pc_func = nfsd3_proc_remove,
.pc_decode = nfs3svc_decode_diropargs,
.pc_encode = nfs3svc_encode_wccstatres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_diropargs),
.pc_ressize = sizeof(struct nfsd3_wccstatres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC,
},
[NFS3PROC_RMDIR] = {
.pc_func = nfsd3_proc_rmdir,
.pc_decode = nfs3svc_decode_diropargs,
.pc_encode = nfs3svc_encode_wccstatres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_diropargs),
.pc_ressize = sizeof(struct nfsd3_wccstatres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC,
},
[NFS3PROC_RENAME] = {
.pc_func = nfsd3_proc_rename,
.pc_decode = nfs3svc_decode_renameargs,
.pc_encode = nfs3svc_encode_renameres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_renameargs),
.pc_ressize = sizeof(struct nfsd3_renameres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+WC+WC,
},
[NFS3PROC_LINK] = {
.pc_func = nfsd3_proc_link,
.pc_decode = nfs3svc_decode_linkargs,
.pc_encode = nfs3svc_encode_linkres,
.pc_release = nfs3svc_release_fhandle2,
.pc_argsize = sizeof(struct nfsd3_linkargs),
.pc_ressize = sizeof(struct nfsd3_linkres),
.pc_cachetype = RC_REPLBUFF,
.pc_xdrressize = ST+pAT+WC,
},
[NFS3PROC_READDIR] = {
.pc_func = nfsd3_proc_readdir,
.pc_decode = nfs3svc_decode_readdirargs,
.pc_encode = nfs3svc_encode_readdirres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_readdirargs),
.pc_ressize = sizeof(struct nfsd3_readdirres),
.pc_cachetype = RC_NOCACHE,
},
[NFS3PROC_READDIRPLUS] = {
.pc_func = nfsd3_proc_readdirplus,
.pc_decode = nfs3svc_decode_readdirplusargs,
.pc_encode = nfs3svc_encode_readdirres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_readdirplusargs),
.pc_ressize = sizeof(struct nfsd3_readdirres),
.pc_cachetype = RC_NOCACHE,
},
[NFS3PROC_FSSTAT] = {
.pc_func = nfsd3_proc_fsstat,
.pc_decode = nfs3svc_decode_fhandleargs,
.pc_encode = nfs3svc_encode_fsstatres,
.pc_argsize = sizeof(struct nfsd3_fhandleargs),
.pc_ressize = sizeof(struct nfsd3_fsstatres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+2*6+1,
},
[NFS3PROC_FSINFO] = {
.pc_func = nfsd3_proc_fsinfo,
.pc_decode = nfs3svc_decode_fhandleargs,
.pc_encode = nfs3svc_encode_fsinfores,
.pc_argsize = sizeof(struct nfsd3_fhandleargs),
.pc_ressize = sizeof(struct nfsd3_fsinfores),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+12,
},
[NFS3PROC_PATHCONF] = {
.pc_func = nfsd3_proc_pathconf,
.pc_decode = nfs3svc_decode_fhandleargs,
.pc_encode = nfs3svc_encode_pathconfres,
.pc_argsize = sizeof(struct nfsd3_fhandleargs),
.pc_ressize = sizeof(struct nfsd3_pathconfres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT+6,
},
[NFS3PROC_COMMIT] = {
.pc_func = nfsd3_proc_commit,
.pc_decode = nfs3svc_decode_commitargs,
.pc_encode = nfs3svc_encode_commitres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_commitargs),
.pc_ressize = sizeof(struct nfsd3_commitres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+WC+2,
},
};
static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures3)];
const struct svc_version nfsd_version3 = {
.vs_vers = 3,
.vs_nproc = 22,
.vs_proc = nfsd_procedures3,
.vs_dispatch = nfsd_dispatch,
.vs_count = nfsd_count3,
.vs_xdrsize = NFS3_SVC_XDRSIZE,
};