arlad/aix-subr.c

   1 /*
   2  * Copyright (c) 1995 - 2002 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
  36 #include "arla_local.h"
  37 RCSID("$Id$");
  38
  39 static long blocksize = 1024;
  40
  41 static void
  42 flushbuf (void *vargs)
  43 {
  44     struct write_dirent_args *args = (struct write_dirent_args *)vargs;
  45     struct dirent *last = (struct dirent *)args->last;
  46     unsigned inc = blocksize - (args->ptr - args->buf);
  47
  48     last->d_reclen += inc;
  49     last->d_offset += inc;
  50     if (write (args->fd, args->buf, blocksize) != blocksize)
  51         arla_warn (ADEBWARN, errno, "write");
  52     args->ptr = args->buf;
  53     args->last = NULL;
  54     memset(args->buf, 0, blocksize);
  55 }
  56
  57 #undef DIRSIZ
  58 #define DIRSIZ(name) \
  59         (((sizeof(struct dirent)+ (strlen(name)+1)) + \
  60           3) & ~3)
  61
  62 static int
  63 write_dirent(VenusFid *fid, const char *name, void *arg)
  64 {
  65      struct dirent *real;
  66      struct write_dirent_args *args = (struct write_dirent_args *)arg;
  67      u_short reclen;
  68
  69      reclen = DIRSIZ(name);
  70
  71      if (args->ptr + reclen > args->buf + blocksize)
  72           flushbuf (args);
  73      real = (struct dirent *)args->ptr;
  74
  75      real->d_reclen = reclen;
  76      real->d_ino = dentry2ino (name, fid, args->e);
  77      strcpy (real->d_name, name);
  78      args->ptr += real->d_reclen;
  79      args->off += real->d_reclen;
  80      real->d_offset = args->off;
  81      args->last = real;
  82      return 0;
  83 }
  84
  85 int
  86 conv_dir (FCacheEntry *e, CredCacheEntry *ce, u_int tokens,
  87           fcache_cache_handle *cache_handle,
  88           char *cache_name, size_t cache_name_sz)
  89 {
  90     return conv_dir_sub (e, ce, tokens, cache_handle, cache_name,
  91                          cache_name_sz, write_dirent, flushbuf, blocksize);
  92 }
  93
  94 /*
  95  * remove `filename` from the converted directory for `e'
  96  */
  97
  98 int
  99 dir_remove_name (FCacheEntry *e, const char *filename,
 100                  fcache_cache_handle *cache_handle,
 101                  char *cache_name, size_t cache_name_sz)
 102 {
 103     int ret;
 104     int fd;
 105     fbuf fb;
 106     struct stat sb;
 107     char *buf;
 108     char *p;
 109     size_t len;
 110     struct dirent *dp;
 111     struct dirent *last_dp;
 112
 113     fcache_extra_file_name (e, cache_name, cache_name_sz);
 114     fd = open (cache_name, O_RDWR, 0);
 115     if (fd < 0)
 116         return errno;
 117     fcache_fhget (cache_name, cache_handle);
 118     if (fstat (fd, &sb) < 0) {
 119         ret = errno;
 120         close (fd);
 121         return ret;
 122     }
 123     len = sb.st_size;
 124
 125     ret = fbuf_create (&fb, fd, len, FBUF_READ|FBUF_WRITE|FBUF_SHARED);
 126     if (ret) {
 127         close (fd);
 128         return ret;
 129     }
 130     last_dp = NULL;
 131     ret = ENOENT;
 132     for (p = buf = fbuf_buf (&fb); p < buf + len; p += dp->d_reclen) {
 133         dp = (struct dirent *)p;
 134
 135         if (strcmp (filename, dp->d_name) == 0) {
 136             if (last_dp != NULL) {
 137                 struct dirent new_last;
 138
 139                 new_last.d_reclen = last_dp->d_reclen + dp->d_reclen;
 140                 if (new_last.d_reclen >= last_dp->d_reclen)
 141                     last_dp->d_reclen = new_last.d_reclen;
 142             }
 143             dp->d_ino = 0;
 144             ret = 0;
 145             break;
 146         }
 147         last_dp = dp;
 148     }
 149     fbuf_end (&fb);
 150     close (fd);
 151     return ret;
 152 }