1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * 26 * Stuff relating to directory reading ... 27 */ 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <rpc/types.h> 32 #include <rpc/auth.h> 33 #include <rpc/xdr.h> 34 #include "clnt.h" 35 #include <rpc/rpc_msg.h> 36 #include <sys/t_lock.h> 37 #include "nfs_inet.h" 38 #include <rpc/rpc.h> 39 #include "brpc.h" 40 #include <rpcsvc/nfs_prot.h> 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 #include <sys/bootvfs.h> 44 #include <sys/sysmacros.h> 45 #include "socket_inet.h" 46 #include <sys/salib.h> 47 #include <sys/bootdebug.h> 48 49 #define MAXDENTS 16 50 #define MINSIZ 20 51 52 /* 53 * Boot needs to be cleaned up to use either dirent32 or dirent64, 54 * in the meantime use dirent_t and always round to 8 bytes 55 */ 56 #define BDIRENT_RECLEN(namelen) \ 57 ((offsetof(dirent_t, d_name[0]) + 1 + (namelen) + 7) & ~ 7) 58 59 #define dprintf if (boothowto & RB_DEBUG) printf 60 61 /* 62 * Get directory entries: 63 * 64 * Uses the nfs "READDIR" operation to read directory entries 65 * into a local buffer. These are then translated into file 66 * system independent "dirent" structs and returned in the 67 * caller's buffer. Returns the number of entries converted 68 * (-1 if there's an error). 69 * 70 * Although the xdr functions can allocate memory, we have 71 * a limited heap so we allocate our own space, 72 * assuming the worst case of 256 byte names. 73 * This is a space hog in our local buffer, so we want 74 * the number of buffers to be small. To make sure we don't 75 * get more names than we can handle, we tell the rpc 76 * routine that we only have space for MAXDENT names if 77 * they are all the minimum size. This keeps the return 78 * packet unfragmented, but may result in lots of reads 79 * to process a large directory. Since this is standalone 80 * we don't worry about speed. With MAXDENTs at 16, the 81 * local buffer is 4k. 82 */ 83 84 int 85 nfsgetdents(struct nfs_file *nfp, struct dirent *dep, unsigned size) 86 { 87 entry *ep; 88 readdirargs rda; 89 readdirres res; 90 enum clnt_stat status; 91 struct { 92 entry etlist[MAXDENTS]; 93 char names[MAXDENTS][NFS_MAXNAMLEN+1]; 94 } rdbuf; 95 uint32_t offset; 96 int j, cnt = 0; 97 struct timeval zero_timeout = {0, 0}; /* default */ 98 99 bzero((caddr_t)&res, sizeof (res)); 100 bzero((caddr_t)&rda, sizeof (rda)); 101 bzero((caddr_t)rdbuf.etlist, sizeof (rdbuf.etlist)); 102 bcopy((caddr_t)&nfp->fh.fh2, (caddr_t)&rda.dir, NFS_FHSIZE); 103 bcopy((caddr_t)nfp->cookie.cookie2, (caddr_t)rda.cookie, 104 sizeof (nfscookie)); 105 106 while (!res.readdirres_u.reply.eof) { 107 /* 108 * Keep issuing nfs calls until EOF is reached on 109 * the directory or the user buffer is filled. 110 */ 111 112 for (j = 0; j < MAXDENTS; j++) { 113 /* 114 * Link our buffers together for the benefit of 115 * XDR. We do this each time we issue the rpc call 116 * JIC the xdr decode 117 * routines screw up the linkage! 118 */ 119 120 rdbuf.etlist[j].name = rdbuf.names[(MAXDENTS-1) - j]; 121 rdbuf.etlist[j].nextentry = 122 (j < (MAXDENTS-1)) ? &rdbuf.etlist[j+1] : 0; 123 } 124 125 res.readdirres_u.reply.entries = rdbuf.etlist; 126 /* 127 * Cannot give the whole buffer unless every name is 128 * 256 bytes! Assume the worst case of all 1 byte names. 129 * This results in MINSIZ bytes/name in the xdr stream. 130 */ 131 rda.count = sizeof (res) + MAXDENTS*MINSIZ; 132 bzero((caddr_t)rdbuf.names, sizeof (rdbuf.names)); 133 134 status = CLNT_CALL(root_CLIENT, NFSPROC_READDIR, 135 xdr_readdirargs, (caddr_t)&rda, 136 xdr_readdirres, (caddr_t)&res, zero_timeout); 137 138 if (status != RPC_SUCCESS) { 139 dprintf("nfs_getdents: RPC error\n"); 140 return (-1); 141 } 142 if (res.status != NFS_OK) { 143 /* 144 * The most common failure here would be trying to 145 * issue a getdents call on a non-directory! 146 */ 147 148 nfs_error(res.status); 149 return (-1); 150 } 151 152 for (ep = rdbuf.etlist; ep; ep = ep->nextentry) { 153 /* 154 * Step thru all entries returned by NFS, converting 155 * to the cannonical form and copying out to the 156 * user's buffer. 157 */ 158 159 int n; 160 161 /* 162 * catch the case user called at EOF 163 */ 164 if ((n = strlen(ep->name)) == 0) 165 return (cnt); 166 167 n = BDIRENT_RECLEN(n); 168 169 if (n > size) 170 return (cnt); 171 size -= n; 172 173 (void) strcpy(dep->d_name, ep->name); 174 dep->d_ino = ep->fileid; 175 bcopy(ep->cookie, &offset, sizeof (nfscookie)); 176 dep->d_off = offset; 177 dep->d_reclen = (ushort_t)n; 178 179 dep = (struct dirent *)((char *)dep + n); 180 bcopy(ep->cookie, rda.cookie, sizeof (nfscookie)); 181 bcopy(ep->cookie, nfp->cookie.cookie2, 182 sizeof (nfscookie)); 183 cnt++; 184 } 185 } 186 187 return (cnt); 188 } 189