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