arlad/bsd-subr.c

   1 /*
   2  * Copyright (c) 1995 - 2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "arla_local.h"
  35 RCSID("$Id$");
  36
  37 #ifdef __linux__
  38 #include <nnpfs/nnpfs_dirent.h>
  39 #else
  40 #define NNPFS_DIRENT_BLOCKSIZE 512
  41 #define nnpfs_dirent dirent
  42 #endif
  43
  44 static long blocksize = NNPFS_DIRENT_BLOCKSIZE; /* XXX */
  45
  46 /*
  47  * Write out all remaining data in `args'
  48  */
  49
  50 static void
  51 flushbuf (void *vargs)
  52 {
  53     struct write_dirent_args *args = (struct write_dirent_args *)vargs;
  54     unsigned inc = blocksize - (args->ptr - args->buf);
  55     struct nnpfs_dirent *last = (struct nnpfs_dirent *)args->last;
  56
  57     last->d_reclen += inc;
  58     if (write (args->fd, args->buf, blocksize) != blocksize)
  59         arla_warn (ADEBWARN, errno, "write");
  60     args->ptr = args->buf;
  61     args->last = NULL;
  62     memset(args->buf, 0, blocksize);
  63 }
  64
  65 /*
  66  * Write a dirent to the args buf in `arg' containg `fid' and `name'.
  67  */
  68
  69 static int
  70 write_dirent(VenusFid *fid, const char *name, void *arg)
  71 {
  72      struct nnpfs_dirent dirent, *real;
  73      struct write_dirent_args *args = (struct write_dirent_args *)arg;
  74
  75      dirent.d_namlen = strlen (name);
  76 #ifdef _GENERIC_DIRSIZ
  77      dirent.d_reclen = _GENERIC_DIRSIZ(&dirent);
  78 #elif defined(DIRENT_SIZE)
  79      dirent.d_reclen = DIRENT_SIZE(&dirent);
  80 #elif defined(_DIRENT_SIZE)
  81      dirent.d_reclen = _DIRENT_SIZE(&dirent);
  82 #else
  83      dirent.d_reclen = DIRSIZ(&dirent);
  84 #endif
  85
  86      if (args->ptr + dirent.d_reclen > args->buf + blocksize)
  87           flushbuf (args);
  88      real = (struct nnpfs_dirent *)args->ptr;
  89
  90      real->d_namlen = dirent.d_namlen;
  91      real->d_reclen = dirent.d_reclen;
  92 #if defined(HAVE_STRUCT_DIRENT_D_TYPE) && !defined(__linux__)
  93      real->d_type   = DT_UNKNOWN;
  94 #endif
  95
  96      real->d_fileno = dentry2ino (name, fid, args->e);
  97      strlcpy (real->d_name, name, sizeof(real->d_name));
  98      args->ptr += real->d_reclen;
  99      args->off += real->d_reclen;
 100      args->last = real;
 101      return 0;
 102 }
 103
 104 int
 105 conv_dir (FCacheEntry *e, CredCacheEntry *ce, u_int tokens)
 106 {
 107     return conv_dir_sub(e, ce, tokens, write_dirent, flushbuf, blocksize);
 108 }
 109
 110 /*
 111  * remove `filename` from the converted directory for `e'
 112  */
 113
 114 #ifndef DIRBLKSIZ
 115 #define DIRBLKSIZ 1024
 116 #endif
 117
 118 int
 119 dir_remove_name (FCacheEntry *e, const char *filename)
 120 {
 121     char cache_name[MAXPATHLEN];
 122     int ret;
 123     int fd;
 124     fbuf fb;
 125     struct stat sb;
 126     char *buf;
 127     char *p;
 128     size_t len;
 129     struct nnpfs_dirent *dp;
 130     struct nnpfs_dirent *last_dp;
 131
 132     fcache_extra_file_name (e, cache_name, MAXPATHLEN);
 133     fd = open (cache_name, O_RDWR, 0);
 134     if (fd < 0)
 135         return errno;
 136
 137     /* fcache_fhget (cache_name, cache_handle); */
 138
 139     if (fstat (fd, &sb) < 0) {
 140         ret = errno;
 141         close (fd);
 142         return ret;
 143     }
 144     len = sb.st_size;
 145
 146     ret = fbuf_create (&fb, fd, len, FBUF_READ|FBUF_WRITE);
 147     if (ret) {
 148         close (fd);
 149         return ret;
 150     }
 151     last_dp = NULL;
 152     ret = ENOENT;
 153     for (p = buf = fbuf_buf (&fb); p < buf + len; p += dp->d_reclen) {
 154
 155         dp = (struct nnpfs_dirent *)p;
 156
 157         assert (dp->d_reclen > 0);
 158
 159         if (strcmp (filename, dp->d_name) == 0) {
 160             if (last_dp != NULL) {
 161                 size_t off1, off2;
 162                 unsigned len;
 163
 164                 /*
 165                  * d_reclen can be as largest (in worst case)
 166                  * DIRBLKSIZ, and may not cause the entry to cross a
 167                  * DIRBLKSIZ boundery.
 168                  */
 169                 len = last_dp->d_reclen + dp->d_reclen;
 170
 171                 off1 = (char *)last_dp - buf;
 172                 off2 = off1 + len;
 173                 off1 /= DIRBLKSIZ;
 174                 off2 /= DIRBLKSIZ;
 175
 176                 if (len < DIRBLKSIZ && off1 == off2)
 177                     last_dp->d_reclen = len;
 178             }
 179             dp->d_fileno = 0;
 180             ret = 0;
 181             break;
 182         }
 183         last_dp = dp;
 184     }
 185     fbuf_end (&fb);
 186     close (fd);
 187     return ret;
 188 }