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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Stuff relating to NFSv3 directory reading ...
*/
#include <rpc/types.h>
#include <rpc/auth.h>
#include <rpc/xdr.h>
#include "clnt.h"
#include <rpc/rpc_msg.h>
#include <sys/t_lock.h>
#include "nfs_inet.h"
#include <rpc/rpc.h>
#include "brpc.h"
#include <rpcsvc/nfs_prot.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/bootvfs.h>
#include <sys/sysmacros.h>
#include "socket_inet.h"
#include <sys/salib.h>
#include <sys/bootdebug.h>
#define MAXDENTS 16
#define MINSIZ 20
/*
* Boot needs to be cleaned up to use either dirent32 or dirent64,
* in the meantime use dirent_t and always round to 8 bytes
*/
#define BDIRENT_RECLEN(namelen) \
((offsetof(dirent_t, d_name[0]) + 1 + (namelen) + 7) & ~ 7)
#define dprintf if (boothowto & RB_DEBUG) printf
/*
* Get directory entries:
*
* Uses the nfs "READDIR" operation to read directory entries
* into a local buffer. These are then translated into file
* system independent "dirent" structs and returned in the
* caller's buffer. Returns the number of entries converted
* (-1 if there's an error).
*
* Although the xdr functions can allocate memory, we have
* a limited heap so we allocate our own space,
* assuming the worst case of 256 byte names.
* This is a space hog in our local buffer, so we want
* the number of buffers to be small. To make sure we don't
* get more names than we can handle, we tell the rpc
* routine that we only have space for MAXDENT names if
* they are all the minimum size. This keeps the return
* packet unfragmented, but may result in lots of reads
* to process a large directory. Since this is standalone
* we don't worry about speed. With MAXDENTs at 16, the
* local buffer is 4k.
*/
int
nfs3getdents(struct nfs_file *nfp, struct dirent *dep, unsigned size)
{
int cnt = 0;
entry3 *ep;
READDIR3args rda;
READDIR3res res;
enum clnt_stat status;
struct {
entry3 etlist[MAXDENTS];
char names[MAXDENTS][NFS_MAXNAMLEN+1];
} rdbuf;
int j;
struct timeval zero_timeout = {0, 0}; /* default */
bzero((caddr_t)&res, sizeof (res));
bzero((caddr_t)&rda, sizeof (rda));
bzero((caddr_t)rdbuf.etlist, sizeof (rdbuf.etlist));
rda.dir.data.data_len = nfp->fh.fh3.len;
rda.dir.data.data_val = nfp->fh.fh3.data;
rda.cookie = nfp->cookie.cookie3;
while (!res.READDIR3res_u.resok.reply.eof) {
/*
* Keep issuing nfs calls until EOF is reached on
* the directory or the user buffer is filled.
*/
for (j = 0; j < MAXDENTS; j++) {
/*
* Link our buffers together for the benefit of
* XDR. We do this each time we issue the rpc call
* JIC the xdr decode
* routines screw up the linkage!
*/
rdbuf.etlist[j].name = rdbuf.names[(MAXDENTS-1) - j];
rdbuf.etlist[j].nextentry =
(j < (MAXDENTS-1)) ? &rdbuf.etlist[j+1] : 0;
}
res.READDIR3res_u.resok.reply.entries = rdbuf.etlist;
/*
* Cannot give the whole buffer unless every name is
* 256 bytes! Assume the worst case of all 1 byte names.
* This results in MINSIZ bytes/name in the xdr stream.
*/
rda.count = sizeof (res) + MAXDENTS*MINSIZ;
bzero((caddr_t)rdbuf.names, sizeof (rdbuf.names));
status = CLNT_CALL(root_CLIENT, NFSPROC3_READDIR,
xdr_READDIR3args, (caddr_t)&rda,
xdr_READDIR3res, (caddr_t)&res, zero_timeout);
if (status != RPC_SUCCESS) {
dprintf("nfs3_getdents: RPC error\n");
return (-1);
}
if (res.status != NFS3_OK) {
/*
* The most common failure here would be trying to
* issue a getdents call on a non-directory!
*/
nfs3_error(res.status);
return (-1);
}
for (ep = rdbuf.etlist; ep; ep = ep->nextentry) {
/*
* Step thru all entries returned by NFS, converting
* to the cannonical form and copying out to the
* user's buffer.
*/
int n;
/*
* catch the case user called at EOF
*/
if ((n = strlen(ep->name)) == 0)
return (cnt);
n = BDIRENT_RECLEN(n);
if (n > size)
return (cnt);
size -= n;
(void) strlcpy(dep->d_name, ep->name,
strlen(ep->name) + 1);
dep->d_ino = ep->fileid;
dep->d_off = (off_t)ep->cookie;
dep->d_reclen = (ushort_t)n;
dep = (struct dirent *)((char *)dep + n);
rda.cookie = ep->cookie;
nfp->cookie.cookie3 = ep->cookie;
cnt++;
}
}
return (cnt);
}
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