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 */
};

/*
 * 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:
	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,
	};

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

	fh_copy(&resp->fh, &argp->fh);
	resp->status = nfsd_setattr(rqstp, &resp->fh, &attrs,
				    argp->check_guard, argp->guardtime);
	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);
	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);
	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->fh);
	resp->len = NFS3_MAXPATHLEN;
	resp->pages = rqstp->rq_next_page++;
	resp->status = nfsd_readlink(rqstp, &resp->fh,
				     page_address(*resp->pages), &resp->len);
	return rpc_success;
}

/*
 * 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;
	unsigned int len;
	int v;

	dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
				SVCFH_fmt(&argp->fh),
				(unsigned long) argp->count,
				(unsigned long long) argp->offset);

	argp->count = min_t(u32, argp->count, svc_max_payload(rqstp));
	argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen);
	if (argp->offset > (u64)OFFSET_MAX)
		argp