firmware/common/dir_uncached.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id: dir.c 13741 2007-06-30 02:08:27Z jethead71 $
   9  *
  10  * Copyright (C) 2002 by Björn Stenberg
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdio.h>
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <stdlib.h>
  26 #include "fat.h"
  27 #include "dir.h"
  28 #include "debug.h"
  29 #include "filefuncs.h"
  30
  31 #if ((defined(MEMORYSIZE) && (MEMORYSIZE > 8)) || MEM > 8)
  32 #define MAX_OPEN_DIRS 12
  33 #else
  34 #define MAX_OPEN_DIRS 8
  35 #endif
  36
  37 static DIR_UNCACHED opendirs[MAX_OPEN_DIRS];
  38
  39 #ifdef HAVE_HOTSWAP
  40 // release all dir handles on a given volume "by force", to avoid leaks
  41 int release_dirs(int volume)
  42 {
  43     DIR_UNCACHED* pdir = opendirs;
  44     int dd;
  45     int closed = 0;
  46     for ( dd=0; dd<MAX_OPEN_DIRS; dd++, pdir++)
  47     {
  48 #ifdef HAVE_MULTIVOLUME
  49         if (pdir->fatdir.file.volume == volume)
  50 #else
  51         (void)volume;
  52 #endif
  53         {
  54             pdir->busy = false; /* mark as available, no further action */
  55             closed++;
  56         }
  57     }
  58     return closed; /* return how many we did */
  59 }
  60 #endif /* #ifdef HAVE_HOTSWAP */
  61
  62 DIR_UNCACHED* opendir_uncached(const char* name)
  63 {
  64     char namecopy[MAX_PATH];
  65     char* part;
  66     char* end;
  67     struct fat_direntry entry;
  68     int dd;
  69     DIR_UNCACHED* pdir = opendirs;
  70 #ifdef HAVE_MULTIVOLUME
  71     int volume;
  72 #endif
  73
  74     if ( name[0] != '/' ) {
  75         DEBUGF("Only absolute paths supported right now\n");
  76         return NULL;
  77     }
  78
  79     /* find a free dir descriptor */
  80     for ( dd=0; dd<MAX_OPEN_DIRS; dd++, pdir++)
  81         if ( !pdir->busy )
  82             break;
  83
  84     if ( dd == MAX_OPEN_DIRS ) {
  85         DEBUGF("Too many dirs open\n");
  86         errno = EMFILE;
  87         return NULL;
  88     }
  89
  90     pdir->busy = true;
  91
  92 #ifdef HAVE_MULTIVOLUME
  93     /* try to extract a heading volume name, if present */
  94     volume = strip_volume(name, namecopy);
  95     pdir->volumecounter = 0;
  96 #else
  97     strlcpy(namecopy, name, sizeof(namecopy)); /* just copy */
  98 #endif
  99
 100     if ( fat_opendir(IF_MV2(volume,) &pdir->fatdir, 0, NULL) < 0 ) {
 101         DEBUGF("Failed opening root dir\n");
 102         pdir->busy = false;
 103         return NULL;
 104     }
 105
 106     for ( part = strtok_r(namecopy, "/", &end); part;
 107           part = strtok_r(NULL, "/", &end)) {
 108         /* scan dir for name */
 109         while (1) {
 110             if ((fat_getnext(&pdir->fatdir,&entry) < 0) ||
 111                 (!entry.name[0])) {
 112                 pdir->busy = false;
 113                 return NULL;
 114             }
 115             if ( (entry.attr & FAT_ATTR_DIRECTORY) &&
 116                  (!strcasecmp(part, entry.name)) ) {
 117                 pdir->parent_dir = pdir->fatdir;
 118                 if ( fat_opendir(IF_MV2(volume,)
 119                                  &pdir->fatdir,
 120                                  entry.firstcluster,
 121                                  &pdir->parent_dir) < 0 ) {
 122                     DEBUGF("Failed opening dir '%s' (%ld)\n",
 123                            part, entry.firstcluster);
 124                     pdir->busy = false;
 125                     return NULL;
 126                 }
 127 #ifdef HAVE_MULTIVOLUME
 128                 pdir->volumecounter = -1; /* n.a. to subdirs */
 129 #endif
 130                 break;
 131             }
 132         }
 133     }
 134
 135     return pdir;
 136 }
 137
 138 int closedir_uncached(DIR_UNCACHED* dir)
 139 {
 140     dir->busy=false;
 141     return 0;
 142 }
 143
 144 struct dirent_uncached* readdir_uncached(DIR_UNCACHED* dir)
 145 {
 146     struct fat_direntry entry;
 147     struct dirent_uncached* theent = &(dir->theent);
 148
 149     if (!dir->busy)
 150         return NULL;
 151
 152 #ifdef HAVE_MULTIVOLUME
 153     /* Volumes (secondary file systems) get inserted into the root directory
 154         of the first volume, since we have no separate top level. */
 155     if (dir->volumecounter >= 0 /* on a root dir */
 156      && dir->volumecounter < NUM_VOLUMES /* in range */
 157      && dir->fatdir.file.volume == 0) /* at volume 0 */
 158     {   /* fake special directories, which don't really exist, but
 159            will get redirected upon opendir_uncached() */
 160         while (++dir->volumecounter < NUM_VOLUMES)
 161         {
 162             if (fat_ismounted(dir->volumecounter))
 163             {
 164                 memset(theent, 0, sizeof(*theent));
 165                 theent->attribute = FAT_ATTR_DIRECTORY | FAT_ATTR_VOLUME;
 166                 snprintf(theent->d_name, sizeof(theent->d_name),
 167                          VOL_NAMES, dir->volumecounter);
 168                 return theent;
 169             }
 170         }
 171     }
 172 #endif
 173     /* normal directory entry fetching follows here */
 174     if (fat_getnext(&(dir->fatdir),&entry) < 0)
 175         return NULL;
 176
 177     if ( !entry.name[0] )
 178         return NULL;
 179
 180     strlcpy(theent->d_name, entry.name, sizeof(theent->d_name));
 181     theent->attribute = entry.attr;
 182     theent->size = entry.filesize;
 183     theent->startcluster = entry.firstcluster;
 184     theent->wrtdate = entry.wrtdate;
 185     theent->wrttime = entry.wrttime;
 186
 187     return theent;
 188 }
 189
 190 int mkdir_uncached(const char *name)
 191 {
 192     DIR_UNCACHED *dir;
 193     char namecopy[MAX_PATH];
 194     char* end;
 195     char *basename;
 196     char *parent;
 197     struct dirent_uncached *entry;
 198     struct fat_dir newdir;
 199     int rc;
 200
 201     if ( name[0] != '/' ) {
 202         DEBUGF("mkdir: Only absolute paths supported right now\n");
 203         return -1;
 204     }
 205
 206     strlcpy(namecopy, name, sizeof(namecopy));
 207
 208     /* Split the base name and the path */
 209     end = strrchr(namecopy, '/');
 210     *end = 0;
 211     basename = end+1;
 212
 213     if(namecopy == end) /* Root dir? */
 214         parent = "/";
 215     else
 216         parent = namecopy;
 217
 218     DEBUGF("mkdir: parent: %s, name: %s\n", parent, basename);
 219
 220     dir = opendir_uncached(parent);
 221
 222     if(!dir) {
 223         DEBUGF("mkdir: can't open parent dir\n");
 224         return -2;
 225     }
 226
 227     if(basename[0] == 0) {
 228         DEBUGF("mkdir: Empty dir name\n");
 229         errno = EINVAL;
 230         return -3;
 231     }
 232
 233     /* Now check if the name already exists */
 234     while ((entry = readdir_uncached(dir))) {
 235         if ( !strcasecmp(basename, entry->d_name) ) {
 236             DEBUGF("mkdir error: file exists\n");
 237             errno = EEXIST;
 238             closedir_uncached(dir);
 239             return - 4;
 240         }
 241     }
 242
 243     memset(&newdir, 0, sizeof(struct fat_dir));
 244
 245     rc = fat_create_dir(basename, &newdir, &(dir->fatdir));
 246     closedir_uncached(dir);
 247
 248     return rc;
 249 }
 250
 251 int rmdir_uncached(const char* name)
 252 {
 253     int rc;
 254     DIR_UNCACHED* dir;
 255     struct dirent_uncached* entry;
 256
 257     dir = opendir_uncached(name);
 258     if (!dir)
 259     {
 260         errno = ENOENT; /* open error */
 261         return -1;
 262     }
 263
 264     /* check if the directory is empty */
 265     while ((entry = readdir_uncached(dir)))
 266     {
 267         if (strcmp(entry->d_name, ".") &&
 268             strcmp(entry->d_name, ".."))
 269         {
 270             DEBUGF("rmdir error: not empty\n");
 271             errno = ENOTEMPTY;
 272             closedir_uncached(dir);
 273             return -2;
 274         }
 275     }
 276
 277     rc = fat_remove(&(dir->fatdir.file));
 278     if ( rc < 0 ) {
 279         DEBUGF("Failed removing dir: %d\n", rc);
 280         errno = EIO;
 281         rc = rc * 10 - 3;
 282     }
 283
 284     closedir_uncached(dir);
 285     return rc;
 286 }