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

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

	fh_copy(&resp->fh, &argp->fh);
	resp->status = nfsd_setattr(rqstp, &resp->fh, &argp->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 nfsd3_readlinkargs *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->status = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &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;
	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;
	svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);

	fh_copy(&resp->fh, &argp->fh);
	resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
				 rqstp->rq_vec, argp->vlen, &resp->count,
				 &resp->eof);
	return rpc_success;
}

/*
 * 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;
	unsigned long cnt = argp->len;
	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" : "");

	resp->status = nfserr_fbig;
	if (argp->offset > (u64)OFFSET_MAX ||
	    argp->offset + argp->len > (u64)OFFSET_MAX)
		return rpc_success;

	fh_copy(&resp->fh, &argp->fh);
	resp->committed = argp->stable;
	nvecs = svc_fill_write_vector(rqstp, rqstp->rq_arg.pages,
				      &argp->first, cnt);
	if (!nvecs) {
		resp->status = nfserr_io;
		goto out;
	}
	resp->status = nfsd_write