src/volser/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 #include <afsconfig.h>
  11 #include <afs/param.h>
  12
  13
  14 #include <sys/types.h>
  15 #ifdef AFS_NT40_ENV
  16 #include <fcntl.h>
  17 #else
  18 #include <sys/file.h>
  19 #include <netinet/in.h>
  20 #include <unistd.h>
  21 #endif
  22 #include <string.h>
  23 #ifdef  AFS_SUN5_ENV
  24 #include <sys/fcntl.h>
  25 #endif
  26 #include <errno.h>
  27 #include <rx/xdr.h>
  28 #include <rx/rx.h>
  29 #include <stdio.h>
  30 #include <afs/afsint.h>
  31 #include <afs/nfs.h>
  32 #include <afs/afs_assert.h>
  33 #include <afs/dir.h>
  34 #include <afs/ihandle.h>
  35 #include "vol.h"
  36 #include "physio.h"
  37
  38 /* returns 0 on success, errno on failure */
  39 int
  40 ReallyRead(DirHandle * file, int block, char *data)
  41 {
  42     FdHandle_t *fdP;
  43     int code;
  44     ssize_t nBytes;
  45     errno = 0;
  46     fdP = IH_OPEN(file->dirh_handle);
  47     if (fdP == NULL) {
  48         code = errno;
  49         return code;
  50     }
  51     nBytes = FDH_PREAD(fdP, data, AFS_PAGESIZE, ((afs_foff_t)block) * AFS_PAGESIZE);
  52     if (nBytes != AFS_PAGESIZE) {
  53         if (nBytes < 0)
  54             code = errno;
  55         else
  56             code = EIO;
  57         FDH_REALLYCLOSE(fdP);
  58         return code;
  59     }
  60     FDH_CLOSE(fdP);
  61     return 0;
  62 }
  63
  64 /* returns 0 on success, errno on failure */
  65 int
  66 ReallyWrite(DirHandle * file, int block, char *data)
  67 {
  68     FdHandle_t *fdP;
  69     extern int VolumeChanged;
  70     int code;
  71     ssize_t nBytes;
  72
  73     errno = 0;
  74
  75     fdP = IH_OPEN(file->dirh_handle);
  76     if (fdP == NULL) {
  77         code = errno;
  78         return code;
  79     }
  80     nBytes = FDH_PWRITE(fdP, data, AFS_PAGESIZE, ((afs_foff_t)block) * AFS_PAGESIZE);
  81     if (nBytes != AFS_PAGESIZE) {
  82         if (nBytes < 0)
  83             code = errno;
  84         else
  85             code = EIO;
  86         FDH_REALLYCLOSE(fdP);
  87         return code;
  88     }
  89     FDH_CLOSE(fdP);
  90     VolumeChanged = 1;
  91     return 0;
  92 }
  93
  94 /* SetSalvageDirHandle:
  95  * Create a handle to a directory entry and reference it (IH_INIT).
  96  * The handle needs to be dereferenced with the FidZap() routine.
  97  */
  98 void
  99 SetSalvageDirHandle(DirHandle * dir, afs_uint32 volume, afs_int32 device,
 100                     Inode inode)
 101 {
 102     private int SalvageCacheCheck = 1;
 103     memset(dir, 0, sizeof(DirHandle));
 104
 105     dir->dirh_volume = volume;
 106     dir->dirh_device = device;
 107     dir->dirh_inode = inode;
 108     IH_INIT(dir->dirh_handle, device, volume, inode);
 109
 110     /* Always re-read for a new dirhandle */
 111     dir->dirh_cacheCheck = SalvageCacheCheck++;
 112 }
 113
 114 void
 115 FidZap(DirHandle * file)
 116 {
 117     IH_RELEASE(file->dirh_handle);
 118     memset(file, 0, sizeof(DirHandle));
 119 }
 120
 121 void
 122 FidZero(DirHandle * file)
 123 {
 124     memset(file, 0, sizeof(DirHandle));
 125 }
 126
 127 int
 128 FidEq(DirHandle * afile, DirHandle * bfile)
 129 {
 130     if (afile->dirh_volume != bfile->dirh_volume)
 131         return 0;
 132     if (afile->dirh_device != bfile->dirh_device)
 133         return 0;
 134     if (afile->dirh_cacheCheck != bfile->dirh_cacheCheck)
 135         return 0;
 136     if (afile->dirh_inode != bfile->dirh_inode)
 137         return 0;
 138     return 1;
 139 }
 140
 141 int
 142 FidVolEq(DirHandle * afile, afs_int32 vid)
 143 {
 144     if (afile->dirh_volume != vid)
 145         return 0;
 146     return 1;
 147 }
 148
 149 void
 150 FidCpy(DirHandle * tofile, DirHandle * fromfile)
 151 {
 152     *tofile = *fromfile;
 153     IH_COPY(tofile->dirh_handle, fromfile->dirh_handle);
 154 }
 155
 156 void
 157 Die(char *msg)
 158 {
 159     printf("%s\n", msg);
 160     osi_Panic("%s\n", msg);
 161 }