src/libafscp/afscp_file.c

   1 /* AUTORIGHTS
   2 Copyright (C) 2003 - 2010 Chaskiel Grundman
   3 All rights reserved
   4
   5 Redistribution and use in source and binary forms, with or without
   6 modification, are permitted provided that the following conditions
   7 are met:
   8
   9 1. Redistributions of source code must retain the above copyright
  10    notice, this list of conditions and the following disclaimer.
  11
  12 2. Redistributions in binary form must reproduce the above copyright
  13    notice, this list of conditions and the following disclaimer in the
  14    documentation and/or other materials provided with the distribution.
  15
  16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26 */
  27 #include <afsconfig.h>
  28 #include <afs/param.h>
  29
  30 #include <afs/vlserver.h>
  31 #include <afs/vldbint.h>
  32 #include "afscp.h"
  33 #include "afscp_internal.h"
  34
  35 /* this is not yet 64-bit clean */
  36 ssize_t
  37 afscp_PRead(const struct afscp_venusfid * fid, void *buffer,
  38             size_t count, off_t offset)
  39 {
  40     struct AFSFetchStatus fst;
  41     struct AFSVolSync vs;
  42     struct AFSCallBack cb;
  43     struct AFSFid tf = fid->fid;
  44     struct afscp_volume *vol;
  45     struct afscp_server *server;
  46     struct rx_call *c = NULL;
  47     int code, code2 = 0;
  48     int i, j, bytes, totalbytes = 0;
  49     int bytesremaining;
  50     char *p;
  51     time_t now;
  52
  53     vol = afscp_VolumeById(fid->cell, fid->fid.Volume);
  54     if (vol == NULL) {
  55         afscp_errno = ENOENT;
  56         return -1;
  57     }
  58     code = ENOENT;
  59     for (i = 0; i < vol->nservers; i++) {
  60         server = afscp_ServerByIndex(vol->servers[i]);
  61         if (server && server->naddrs > 0) {
  62             for (j = 0; j < server->naddrs; j++) {
  63                 c = rx_NewCall(server->conns[j]);
  64                 if (c != 0) {
  65                     p = buffer;
  66                     code = StartRXAFS_FetchData(c, &tf, offset, count);
  67                     if (code != 0) {
  68                         code = rx_EndCall(c, code);
  69                         continue;
  70                     }
  71                     bytes =
  72                         rx_Read(c, (char *)&bytesremaining,
  73                                 sizeof(afs_int32));
  74                     if (bytes != sizeof(afs_int32)) {
  75                         code = rx_EndCall(c, bytes);
  76                         continue;
  77                     }
  78                     bytesremaining = ntohl(bytesremaining);
  79                     totalbytes = 0;
  80                     while (bytesremaining > 0) {
  81                         bytes = rx_Read(c, p, bytesremaining);
  82                         if (bytes <= 0)
  83                             break;
  84                         p += bytes;
  85                         totalbytes += bytes;
  86                         bytesremaining -= bytes;
  87                     }
  88                     if (bytesremaining == 0) {
  89                         time(&now);
  90                         code2 = EndRXAFS_FetchData(c, &fst, &cb, &vs);
  91                         if (code2 == 0)
  92                             afscp_AddCallBack(server, &fid->fid, &fst, &cb,
  93                                               now);
  94                     }
  95                     code = rx_EndCall(c, code2);
  96                 }
  97                 if (code == 0) {
  98                     return totalbytes;
  99                 }
 100             }
 101         }
 102     }
 103     afscp_errno = code;
 104     return -1;
 105 }
 106
 107 /* this is not yet 64-bit clean */
 108 ssize_t
 109 afscp_PWrite(const struct afscp_venusfid * fid, const void *buffer,
 110              size_t count, off_t offset)
 111 {
 112     struct AFSFetchStatus fst;
 113     struct AFSStoreStatus sst;
 114     struct AFSVolSync vs;
 115     struct AFSCallBack cb;
 116     struct AFSFid tf = fid->fid;
 117     struct afscp_volume *vol;
 118     struct afscp_server *server;
 119     struct rx_call *c = NULL;
 120     int code, code2 = 0;
 121     int i, j, bytes, totalbytes = 0;
 122     int bytesremaining;
 123     const char *p;
 124     off_t filesize;
 125     time_t now;
 126
 127     memset(&sst, 0, sizeof(sst));
 128     vol = afscp_VolumeById(fid->cell, fid->fid.Volume);
 129     if (vol == NULL) {
 130         afscp_errno = ENOENT;
 131         return -1;
 132     }
 133     if (vol->voltype != RWVOL) {
 134         afscp_errno = EROFS;
 135         return -1;
 136     }
 137
 138     code = ENOENT;
 139     for (i = 0; i < vol->nservers; i++) {
 140         server = afscp_ServerByIndex(vol->servers[i]);
 141         if (server && server->naddrs > 0) {
 142             for (j = 0; j < server->naddrs; j++) {
 143                 code =
 144                     RXAFS_FetchStatus(server->conns[j], &tf, &fst, &cb, &vs);
 145                 if (code != 0)
 146                     continue;
 147                 sst.Mask = AFS_SETMODTIME;
 148                 time(&now);
 149                 sst.ClientModTime = now;
 150                 filesize = fst.Length;
 151                 if (offset + count > filesize)
 152                     filesize = offset + count;
 153                 c = rx_NewCall(server->conns[j]);
 154                 if (c != 0) {
 155                     p = buffer;
 156                     code =
 157                         StartRXAFS_StoreData(c, &tf, &sst, offset, count,
 158                                              filesize);
 159                     if (code != 0) {
 160                         code = rx_EndCall(c, code);
 161                         continue;
 162                     }
 163                     /*
 164                      * seems to write file length to beginning of file -- why?
 165                      */
 166                     /*
 167                      * bytesremaining = htonl(count);
 168                      * bytes = rx_Write(c, (char *)&bytesremaining,
 169                      *                  sizeof(afs_int32));
 170                      * if (bytes != sizeof(afs_int32)) {
 171                      *  code = rx_EndCall(c, bytes);
 172                      *  continue;
 173                      * }
 174                      */
 175                     bytesremaining = count;
 176                     totalbytes = 0;
 177                     while (bytesremaining > 0) {
 178                         bytes = rx_Write(c, (char *)p, bytesremaining);
 179                         if (bytes <= 0)
 180                             break;
 181                         p += bytes;
 182                         totalbytes += bytes;
 183                         bytesremaining -= bytes;
 184                     }
 185                     if (bytesremaining == 0) {
 186                         code2 = EndRXAFS_StoreData(c, &fst, &vs);
 187                     }
 188                     code = rx_EndCall(c, code2);
 189                 }
 190                 if (code == 0) {
 191                     return totalbytes;
 192                 }
 193             }
 194         }
 195     }
 196     afscp_errno = code;
 197     return -1;
 198 }