src/afs/HPUX/osi_file.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 "afs/sysincludes.h"    /* Standard vendor system headers */
  15 #include "afsincludes.h"        /* Afs-based standard headers */
  16 #include "afs/afs_stats.h"      /* afs statistics */
  17 #include "afs/osi_inode.h"      /* igetinode() */
  18
  19
  20 int afs_osicred_initialized = 0;
  21 afs_ucred_t afs_osi_cred;
  22 afs_lock_t afs_xosi;            /* lock is for tvattr */
  23 extern struct osi_dev cacheDev;
  24 extern struct vfs *afs_cacheVfsp;
  25
  26
  27 void *
  28 osi_UFSOpen(afs_dcache_id_t *ainode)
  29 {
  30     struct inode *ip;
  31     struct osi_file *afile = NULL;
  32     extern int cacheDiskType;
  33     afs_int32 code = 0;
  34     int dummy;
  35     AFS_STATCNT(osi_UFSOpen);
  36     if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
  37         osi_Panic("UFSOpen called for non-UFS cache\n");
  38     }
  39     if (!afs_osicred_initialized) {
  40         /* valid for alpha_osf, SunOS, Ultrix */
  41         memset(&afs_osi_cred, 0, sizeof(afs_ucred_t));
  42         crhold(&afs_osi_cred);  /* don't let it evaporate, since it is static */
  43         afs_osicred_initialized = 1;
  44     }
  45     afile = osi_AllocSmallSpace(sizeof(struct osi_file));
  46     setuerror(0);
  47     AFS_GUNLOCK();
  48     ip = (struct inode *)igetinode(afs_cacheVfsp, (dev_t) cacheDev.dev,
  49                                    (ino_t) ainode->ufs, &dummy);
  50     AFS_GLOCK();
  51     if (getuerror()) {
  52         osi_FreeSmallSpace(afile);
  53         osi_Panic("UFSOpen: igetinode failed");
  54     }
  55     iunlock(ip);
  56     afile->vnode = ITOV(ip);
  57     afile->size = VTOI(afile->vnode)->i_size;
  58     afile->offset = 0;
  59     afile->proc = (int (*)())0;
  60     return (void *)afile;
  61 }
  62
  63 int
  64 afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat)
  65 {
  66     afs_int32 code;
  67     struct vattr tvattr;
  68     AFS_STATCNT(osi_Stat);
  69     ObtainWriteLock(&afs_xosi, 320);
  70     AFS_GUNLOCK();
  71     code = VOP_GETATTR(afile->vnode, &tvattr, &afs_osi_cred, VSYNC);
  72     AFS_GLOCK();
  73     if (code == 0) {
  74         astat->size = tvattr.va_size;
  75         astat->mtime = tvattr.va_mtime.tv_sec;
  76         astat->atime = tvattr.va_atime.tv_sec;
  77     }
  78     ReleaseWriteLock(&afs_xosi);
  79     return code;
  80 }
  81
  82 int
  83 osi_UFSClose(struct osi_file *afile)
  84 {
  85     AFS_STATCNT(osi_Close);
  86     if (afile->vnode) {
  87         AFS_RELE(afile->vnode);
  88     }
  89
  90     osi_FreeSmallSpace(afile);
  91     return 0;
  92 }
  93
  94 int
  95 osi_UFSTruncate(struct osi_file *afile, afs_int32 asize)
  96 {
  97     afs_ucred_t *oldCred;
  98     struct vattr tvattr;
  99     afs_int32 code;
 100     struct osi_stat tstat;
 101     AFS_STATCNT(osi_Truncate);
 102
 103     /* This routine only shrinks files, and most systems
 104      * have very slow truncates, even when the file is already
 105      * small enough.  Check now and save some time.
 106      */
 107     code = afs_osi_Stat(afile, &tstat);
 108     if (code || tstat.size <= asize)
 109         return code;
 110     ObtainWriteLock(&afs_xosi, 321);
 111     VATTR_NULL(&tvattr);
 112     /* note that this credential swapping stuff is only necessary because
 113      * of ufs's references directly to u.u_cred instead of to
 114      * credentials parameter.  Probably should fix ufs some day. */
 115     oldCred = p_cred(u.u_procp);
 116     set_p_cred(u.u_procp, &afs_osi_cred);
 117     tvattr.va_size = asize;
 118     AFS_GUNLOCK();
 119     code = VOP_SETATTR(afile->vnode, &tvattr, &afs_osi_cred, 0);
 120     AFS_GLOCK();
 121     set_p_cred(u.u_procp, oldCred);     /* restore */
 122     ReleaseWriteLock(&afs_xosi);
 123     return code;
 124 }
 125
 126 void
 127 osi_DisableAtimes(struct vnode *avp)
 128 {
 129     struct inode *ip = VTOI(avp);
 130     ip->i_flag &= ~IACC;
 131 }
 132
 133
 134 /* Generic read interface */
 135 int
 136 afs_osi_Read(struct osi_file *afile, int offset, void *aptr,
 137              afs_int32 asize)
 138 {
 139     afs_ucred_t *oldCred;
 140     long resid;
 141     afs_int32 code;
 142     afs_int32 cnt1 = 0;
 143     AFS_STATCNT(osi_Read);
 144
 145     /**
 146       * If the osi_file passed in is NULL, panic only if AFS is not shutting
 147       * down. No point in crashing when we are already shutting down
 148       */
 149     if (!afile) {
 150         if (afs_shuttingdown == AFS_RUNNING)
 151             osi_Panic("osi_Read called with null param");
 152         else
 153             return -EIO;
 154     }
 155
 156     if (offset != -1)
 157         afile->offset = offset;
 158   retry_IO:
 159     AFS_GUNLOCK();
 160     code =
 161         gop_rdwr(UIO_READ, afile->vnode, (caddr_t) aptr, asize, afile->offset,
 162                  AFS_UIOSYS, IO_UNIT, &resid);
 163     AFS_GLOCK();
 164     if (code == 0) {
 165         code = asize - resid;
 166         afile->offset += code;
 167         osi_DisableAtimes(afile->vnode);
 168     } else {
 169         afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32,
 170                    (afs_int32) resid, ICL_TYPE_INT32, code);
 171         /*
 172          * To handle periodic low-level EFAULT failures that we've seen with the
 173          * Weitek chip; in all observed failed cases a second read succeeded.
 174          */
 175         if ((code == EFAULT) && (cnt1++ < 5)) {
 176             afs_stats_cmperf.osiread_efaults++;
 177             goto retry_IO;
 178         }
 179         setuerror(code);
 180         if (code > 0) {
 181             code = -code;
 182         }
 183     }
 184     return code;
 185 }
 186
 187 /* Generic write interface */
 188 int
 189 afs_osi_Write(struct osi_file *afile, afs_int32 offset, void *aptr,
 190               afs_int32 asize)
 191 {
 192     afs_ucred_t *oldCred;
 193     long resid;
 194     afs_int32 code;
 195     AFS_STATCNT(osi_Write);
 196     if (!afile)
 197         osi_Panic("afs_osi_Write called with null param");
 198     if (offset != -1)
 199         afile->offset = offset;
 200     AFS_GUNLOCK();
 201     code =
 202         gop_rdwr(UIO_WRITE, afile->vnode, (caddr_t) aptr, asize,
 203                  afile->offset, AFS_UIOSYS, IO_UNIT, &resid);
 204     AFS_GLOCK();
 205     if (code == 0) {
 206         code = asize - resid;
 207         afile->offset += code;
 208     } else {
 209         if (code == ENOSPC)
 210             afs_warnuser
 211                 ("\n\n\n*** Cache partition is FULL - Decrease cachesize!!! ***\n\n");
 212         setuerror(code);
 213         if (code > 0) {
 214             code = -code;
 215         }
 216     }
 217     if (afile->proc) {
 218         (*afile->proc) (afile, code);
 219     }
 220     return code;
 221 }
 222
 223
 224 void
 225 shutdown_osifile(void)
 226 {
 227     AFS_STATCNT(shutdown_osifile);
 228     if (afs_cold_shutdown) {
 229         afs_osicred_initialized = 0;
 230     }
 231 }