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