src/viced/physio.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*  physio.c    - Physical I/O routines for the buffer package          */
  11 /*                                                                      */
  12 /*  Date: 5/1/85                                                        */
  13 /*                                                                      */
  14 /************************************************************************/
  15
  16 #include <afsconfig.h>
  17 #include <afs/param.h>
  18
  19
  20 #include <stdio.h>
  21 #include <errno.h>
  22 #include <string.h>
  23 #ifdef AFS_NT40_ENV
  24 #include <fcntl.h>
  25 #else
  26 #include <sys/file.h>
  27 #include <sys/time.h>
  28 #include <unistd.h>
  29 #endif
  30 #include <afs/nfs.h>
  31 #include <afs/assert.h>
  32 #include <lwp.h>
  33 #include <lock.h>
  34 #include <time.h>
  35 #include <afs/afsint.h>
  36 #include <afs/ihandle.h>
  37 #include <afs/vnode.h>
  38 #include <afs/volume.h>
  39 #include "viced_prototypes.h"
  40 #include "viced.h"
  41 #ifdef PAGESIZE
  42 #undef PAGESIZE
  43 #endif
  44 #define PAGESIZE 2048
  45
  46 afs_int32 lpErrno, lpCount;
  47
  48 /* returns 0 on success, errno on failure */
  49 int
  50 ReallyRead(DirHandle * file, int block, char *data)
  51 {
  52     int code;
  53     ssize_t rdlen;
  54     FdHandle_t *fdP;
  55
  56     fdP = IH_OPEN(file->dirh_handle);
  57     if (fdP == NULL) {
  58         code = errno;
  59         ViceLog(0,
  60                 ("ReallyRead(): open failed device %X inode %s errno %d\n",
  61                  file->dirh_handle->ih_dev, PrintInode(NULL,
  62                                                        file->dirh_handle->
  63                                                        ih_ino), code));
  64         return code;
  65     }
  66     if (FDH_SEEK(fdP, block * PAGESIZE, SEEK_SET) < 0) {
  67         code = errno;
  68         ViceLog(0,
  69                 ("ReallyRead(): lseek failed device %X inode %s errno %d\n",
  70                  file->dirh_handle->ih_dev, PrintInode(NULL,
  71                                                        file->dirh_handle->
  72                                                        ih_ino), code));
  73         FDH_REALLYCLOSE(fdP);
  74         return code;
  75     }
  76     rdlen = FDH_READ(fdP, data, PAGESIZE);
  77     if (rdlen != PAGESIZE) {
  78         if (rdlen < 0)
  79             code = errno;
  80         else
  81             code = EIO;
  82         ViceLog(0,
  83                 ("ReallyRead(): read failed device %X inode %s errno %d\n",
  84                  file->dirh_handle->ih_dev, PrintInode(NULL,
  85                                                        file->dirh_handle->
  86                                                        ih_ino), code));
  87         FDH_REALLYCLOSE(fdP);
  88         return code;
  89     }
  90     FDH_CLOSE(fdP);
  91     return 0;
  92
  93 }
  94
  95 /* returns 0 on success, errno on failure */
  96 int
  97 ReallyWrite(DirHandle * file, int block, char *data)
  98 {
  99     ssize_t count;
 100     FdHandle_t *fdP;
 101
 102     fdP = IH_OPEN(file->dirh_handle);
 103     if (fdP == NULL) {
 104         ViceLog(0,
 105                 ("ReallyWrite(): open failed device %X inode %s errno %d\n",
 106                  file->dirh_handle->ih_dev, PrintInode(NULL,
 107                                                        file->dirh_handle->
 108                                                        ih_ino), errno));
 109         lpErrno = errno;
 110         return 0;
 111     }
 112     if (FDH_SEEK(fdP, block * PAGESIZE, SEEK_SET) < 0) {
 113         ViceLog(0,
 114                 ("ReallyWrite(): lseek failed device %X inode %s errno %d\n",
 115                  file->dirh_handle->ih_dev, PrintInode(NULL,
 116                                                        file->dirh_handle->
 117                                                        ih_ino), errno));
 118         lpErrno = errno;
 119         FDH_REALLYCLOSE(fdP);
 120         return 0;
 121     }
 122     if ((count = FDH_WRITE(fdP, data, PAGESIZE)) != PAGESIZE) {
 123         ViceLog(0,
 124                 ("ReallyWrite(): write failed device %X inode %s errno %d\n",
 125                  file->dirh_handle->ih_dev, PrintInode(NULL,
 126                                                        file->dirh_handle->
 127                                                        ih_ino), errno));
 128         lpCount = count;
 129         lpErrno = errno;
 130         FDH_REALLYCLOSE(fdP);
 131         return 0;
 132     }
 133     FDH_CLOSE(fdP);
 134     return 0;
 135 }
 136
 137
 138 void
 139 SetDirHandle(DirHandle * dir, Vnode * vnode)
 140 {
 141     Volume *vp = vnode->volumePtr;
 142     IHandle_t *h;
 143     IH_COPY(h, vnode->handle);
 144     dir->dirh_ino = h->ih_ino;
 145     dir->dirh_dev = h->ih_dev;
 146     dir->dirh_vid = h->ih_vid;
 147     dir->dirh_cacheCheck = vp->cacheCheck;
 148     dir->dirh_unique = vnode->disk.uniquifier;
 149     dir->dirh_vnode = vnode->vnodeNumber;
 150     dir->dirh_handle = h;
 151 }
 152
 153 void
 154 FidZap(DirHandle * file)
 155 {
 156     IH_RELEASE(file->dirh_handle);
 157     memset(file, 0, sizeof(DirHandle));
 158 }
 159
 160 void
 161 FidZero(DirHandle * file)
 162 {
 163     memset(file, 0, sizeof(DirHandle));
 164 }
 165
 166 int
 167 FidEq(DirHandle * afile, DirHandle * bfile)
 168 {
 169     if (afile->dirh_ino != bfile->dirh_ino)
 170         return 0;
 171     if (afile->dirh_dev != bfile->dirh_dev)
 172         return 0;
 173     if (afile->dirh_vid != bfile->dirh_vid)
 174         return 0;
 175     if (afile->dirh_cacheCheck != bfile->dirh_cacheCheck)
 176         return 0;
 177     if (afile->dirh_unique != bfile->dirh_unique)
 178         return 0;
 179     if (afile->dirh_vnode != bfile->dirh_vnode)
 180         return 0;
 181
 182     return 1;
 183 }
 184
 185 int
 186 FidVolEq(DirHandle * afile, afs_int32 vid)
 187 {
 188     if (afile->dirh_vid != vid)
 189         return 0;
 190     return 1;
 191 }
 192
 193 int
 194 FidCpy(DirHandle * tofile, DirHandle * fromfile)
 195 {
 196     *tofile = *fromfile;
 197     IH_COPY(tofile->dirh_handle, fromfile->dirh_handle);
 198     return 0;
 199 }