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