/* * 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 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 nfsgetdents(struct nfs_file *nfp, struct dirent *dep, unsigned size) { entry *ep; readdirargs rda; readdirres res; enum clnt_stat status; struct { entry etlist[MAXDENTS]; char names[MAXDENTS][NFS_MAXNAMLEN+1]; } rdbuf; uint32_t offset; int j, cnt = 0; 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)); bcopy((caddr_t)&nfp->fh.fh2, (caddr_t)&rda.dir, NFS_FHSIZE); bcopy((caddr_t)nfp->cookie.cookie2, (caddr_t)rda.cookie, sizeof (nfscookie)); while (!res.readdirres_u.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.readdirres_u.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, NFSPROC_READDIR, xdr_readdirargs, (caddr_t)&rda, xdr_readdirres, (caddr_t)&res, zero_timeout); if (status != RPC_SUCCESS) { dprintf("nfs_getdents: RPC error\n"); return (-1); } if (res.status != NFS_OK) { /* * The most common failure here would be trying to * issue a getdents call on a non-directory! */ nfs_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; bcopy(ep->cookie, &offset, sizeof (nfscookie)); dep->d_off = offset; dep->d_reclen = (ushort_t)n; dep = (struct dirent *)((char *)dep + n); bcopy(ep->cookie, rda.cookie, sizeof (nfscookie)); bcopy(ep->cookie, nfp->cookie.cookie2, sizeof (nfscookie)); cnt++; } } return (cnt); }
