path: root/fs/nfsd/nfs3proc.c

// 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 <linux/namei.h>

#include "cache.h"
#include "xdr3.h"
#include "vfs.h"
#include "filecache.h"

#define NFSDDBG_FACILITY		NFSDDBG_PROC

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 */
};

static __be32 nfsd3_map_status(__be32 status)
{
	switch (status) {
	case nfs_ok:
		break;
	case nfserr_nofilehandle:
		status = nfserr_badhandle;
		break;
	case nfserr_wrongsec:
	case nfserr_file_open:
		status = nfserr_acces;
		break;
	case nfserr_symlink_not_dir:
		status = nfserr_notdir;
		break;
	case nfserr_symlink:
	case nfserr_wrong_type:
		status = nfserr_inval;
		break;
	}
	return status;
}

/*
 * NULL call.
 */
static __be32
nfsd3_proc_null(struct svc_rqst *rqstp)
{
	return rpc_success;
}

/*
 * 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;

	dprintk("nfsd: GETATTR(3)  %s\n",
		SVCFH_fmt(&argp->fh));

	fh_copy(&resp->fh, &argp->fh);
	resp->status = fh_verify(rqstp, &resp->fh, 0,
				 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
	if (resp->status != nfs_ok)
		goto out;

	resp->status = fh_getattr(&resp->fh, &resp->stat);
out:
	resp->status = nfsd3_map_status(resp->status);
	return rpc_success;
}

/*
 * 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;
	struct nfsd_attrs attrs = {
		.na_iattr	= &argp->attrs,
	};
	const struct timespec64 *guardtime = NULL;

	dprintk("nfsd: SETATTR(3)  %s\n",
				SVCFH_fmt(&argp->fh));

	fh_copy(&resp->fh, &argp->fh);
	if (argp->check_guard)
		guardtime = &argp->guardtime;
	resp->status = nfsd_setattr(rqstp, &resp->fh, &attrs, guardtime);
	resp->status = nfsd3_map_status(resp->status);
	return rpc_success;
}

/*
 * 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;

	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);

	resp->status = nfsd_lookup(rqstp, &resp->dirfh,
				   argp->name, argp->len,
				   &resp->fh);
	resp->status = nfsd3_map_status(resp->status);
	return rpc_success;
}

/*
 * 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;

	dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
				SVCFH_fmt(&argp->fh),
				argp->access);

	fh_copy(&resp->fh, &argp->fh);
	resp->access = argp->access;
	resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
	resp->status = nfsd3_map_status(resp->status);
	return rpc_success;
}

/*
 * Read a symlink.
 */
static __be32
nfsd3_proc_readlink(struct svc_rqst *rqstp)
{
	struct nfsd_fhandle *argp = rqstp->rq_argp;
	struct nfsd3_readlinkres *resp = rqstp->rq_resp;

	dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));

	/* Read the symlink. */
	fh_copy(&resp->fh, &argp->