arlad/irix-subr.c

   1 /*
   2  * Copyright (c) 1995 - 2000 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 #define _KERNEL
  35 #include "arla_local.h"
  36 RCSID("$Id$");
  37
  38 static long blocksize = 1024;   /* XXX */
  39
  40 static void
  41 flushbuf (void *vargs)
  42 {
  43     struct write_dirent_args *args = (struct write_dirent_args *)vargs;
  44     struct dirent *last = (struct dirent *)args->last;
  45     unsigned inc = blocksize - (args->ptr - args->buf);
  46
  47     last->d_reclen += inc;
  48     last->d_off    += inc;
  49     if (write (args->fd, args->buf, blocksize) != blocksize)
  50         arla_warn (ADEBWARN, errno, "write");
  51     args->ptr = args->buf;
  52     args->last = NULL;
  53     memset(args->buf, 0, blocksize);
  54 }
  55
  56 static int
  57 write_dirent(VenusFid *fid, const char *name, void *arg)
  58 {
  59      struct dirent64 dirent, *real;
  60      struct write_dirent_args *args = (struct write_dirent_args *)arg;
  61      size_t namelen = strlen (name);
  62
  63      dirent.d_reclen = DIRENT64SIZE(namelen);
  64
  65      if (args->ptr + dirent.d_reclen > args->buf + blocksize)
  66           flushbuf (args);
  67      real = (struct dirent64 *)args->ptr;
  68
  69      real->d_reclen = dirent.d_reclen;
  70      real->d_ino = dentry2ino (name, fid, args->e);
  71      strlcpy (real->d_name, name, sizeof(real->d_name));
  72      args->ptr += real->d_reclen;
  73      args->off += real->d_reclen;
  74      real->d_off = args->off;
  75      args->last = real;
  76      return 0;
  77 }
  78
  79 int
  80 conv_dir (FCacheEntry *e, CredCacheEntry *ce, u_int tokens,
  81           fcache_cache_handle *cache_handle,
  82           char *cache_name, size_t cache_name_sz)
  83 {
  84     return conv_dir_sub (e, ce, tokens, cache_handle, cache_name,
  85                          cache_name_sz, write_dirent, flushbuf, blocksize);
  86 }
  87
  88 /*
  89  * remove `filename` from the converted directory for `e'
  90  */
  91
  92 int
  93 dir_remove_name (FCacheEntry *e, const char *filename,
  94                  fcache_cache_handle *cache_handle,
  95                  char *cache_name, size_t cache_name_sz)
  96 {
  97     int ret;
  98     int fd;
  99     fbuf fb;
 100     struct stat sb;
 101     char *buf;
 102     char *p;
 103     size_t len;
 104     struct dirent64 *dp;
 105     struct dirent64 *last_dp;
 106
 107     fcache_extra_file_name (e, cache_name, cache_name_sz);
 108     fd = open (cache_name, O_RDWR, 0);
 109     if (fd < 0)
 110         return errno;
 111     fcache_fhget (cache_name, cache_handle);
 112     if (fstat (fd, &sb) < 0) {
 113         ret = errno;
 114         close (fd);
 115         return ret;
 116     }
 117     len = sb.st_size;
 118
 119     ret = fbuf_create (&fb, fd, len, FBUF_READ|FBUF_WRITE|FBUF_SHARED);
 120     if (ret) {
 121         close (fd);
 122         return ret;
 123     }
 124     last_dp = NULL;
 125     ret = ENOENT;
 126     for (p = buf = fbuf_buf (&fb); p < buf + len; p += dp->d_reclen) {
 127         dp = (struct dirent64 *)p;
 128
 129         if (strcmp (filename, dp->d_name) == 0) {
 130             if (last_dp != NULL) {
 131                 struct dirent new_last;
 132
 133                 new_last.d_reclen = last_dp->d_reclen + dp->d_reclen;
 134                 if (new_last.d_reclen >= last_dp->d_reclen)
 135                     last_dp->d_reclen = new_last.d_reclen;
 136             }
 137             dp->d_ino = 0;
 138             ret = 0;
 139             break;
 140         }
 141         last_dp = dp;
 142     }
 143     fbuf_end (&fb);
 144     close (fd);
 145     return ret;
 146 }