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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 NFSv4 directory reading ...
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#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
nfs4getdents(struct nfs_file *nfp, struct dirent *dep, unsigned size)
{
int cnt = 0;
b_entry4_t *ep;
readdir4arg_t readdir_args;
readdir4res_t readdir_res;
attr4_bitmap1_t bitmap1;
enum clnt_stat status;
struct {
b_entry4_t etlist[MAXDENTS];
char names[MAXDENTS][NFS_MAXNAMLEN+1];
} rdbuf;
int j;
struct timeval zero_timeout = {0, 0}; /* default */
utf8string str;
char tagname[] = "inetboot readdir";
bzero((caddr_t)&readdir_res, sizeof (readdir4res_t));
bzero((caddr_t)&readdir_args, sizeof (readdir4arg_t));
bzero((caddr_t)rdbuf.etlist, sizeof (rdbuf.etlist));
str.utf8string_len = sizeof (tagname) - 1;
str.utf8string_val = tagname;
if (nfp->fh.fh4.len > 0)
compound_init(&readdir_args.rd_arg, &str, 0, 2, &nfp->fh.fh4);
else
compound_init(&readdir_args.rd_arg, &str, 0, 2, NULL);
readdir_args.rd_opreaddir = OP_READDIR;
readdir_args.rd_cookie = nfp->cookie.cookie4;
while (!readdir_res.rd_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].b_name.utf8string_len = NFS_MAXNAMLEN;
rdbuf.etlist[j].b_name.utf8string_val =
rdbuf.names[(MAXDENTS-1) - j];
rdbuf.etlist[j].b_nextentry =
(j < (MAXDENTS-1)) ? &rdbuf.etlist[j+1] : 0;
}
readdir_res.rd_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.
*/
readdir_args.rd_dircount = MAXDENTS * MINSIZ;
readdir_args.rd_maxcount = sizeof (readdir4res_t) +
(MAXDENTS * MINSIZ);
bzero((caddr_t)rdbuf.names, sizeof (rdbuf.names));
/*
* Set the attr bitmap, so we get the fileid back.
*/
bitmap1.word = 0;
bitmap1.bm_fattr4_fileid = 1;
readdir_args.rd_attr_req.b_bitmap_len = 1;
readdir_args.rd_attr_req.b_bitmap_val[0] = bitmap1.word;
status = CLNT_CALL(root_CLIENT, NFSPROC4_COMPOUND,
xdr_readdir4_args, (caddr_t)&readdir_args,
xdr_readdir4_res, (caddr_t)&readdir_res, zero_timeout);
if (status != RPC_SUCCESS) {
dprintf("nfs4_getdents: RPC error\n");
return (-1);
}
if (readdir_res.rd_status != NFS4_OK) {
/*
* The most common failure here would be trying to
* issue a getdents call on a non-directory!
*/
nfs4_error(readdir_res.rd_status);
return (-1);
}
/*
* If we are reading from the beginning of the
* directory we will need to create the "." and ".."
* since we won't be getting them from the server. To obtain
* the fileid's just issue a couple otw lookups to get the
* info we need.
*/
if (readdir_args.rd_cookie == 0 &&
rdbuf.etlist[0].b_cookie > 2) {
int n;
int error;
uint64_t fileid;
struct vattr va;
/*
* Do a getattr for the '.'
*/
error = nfs4getattr(nfp, &va);
if (error)
return (-1);
dep->d_name[0] = '.';
dep->d_name[1] = '\0';
dep->d_ino = va.va_nodeid;
dep->d_off = 1;
n = BDIRENT_RECLEN(1);
dep->d_reclen = n;
dep = (struct dirent *)((char *)dep + n);
/*
* Do a lookupp for the '..'
*/
(void) nfs4lookupp(nfp, &error, &fileid);
if (error)
return (-1);
dep->d_name[0] = '.';
dep->d_name[1] = '.';
dep->d_name[2] = '\0';
dep->d_ino = fileid;
dep->d_off = 2;
n = BDIRENT_RECLEN(2);
dep->d_reclen = n;
dep = (struct dirent *)((char *)dep + n);
}
for (ep = rdbuf.etlist; ep; ep = ep->b_nextentry) {
/*
* Step thru all entries returned by NFS, converting
* to the cannonical form and copying out to the
* user's buffer.
*/
int n;
int namlen;
/*
* catch the case user called at EOF
*/
if ((namlen = ep->b_name.utf8string_len) == 0)
return (cnt);
n = BDIRENT_RECLEN(namlen);
if (n > size)
return (cnt);
size -= n;
bcopy(ep->b_name.utf8string_val, dep->d_name, namlen);
dep->d_name[namlen] = '\0';
dep->d_ino = ep->b_fileid;
dep->d_off = (off_t)ep->b_cookie;
dep->d_reclen = (ushort_t)n;
dep = (struct dirent *)((char *)dep + n);
readdir_args.rd_cookie = ep->b_cookie;
nfp->cookie.cookie4 = ep->b_cookie;
cnt++;
}
}
return (cnt);
}
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