src/afs/NBSD/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 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  14 #include "afs/afsincludes.h"    /* Afs-based standard headers */
  15 #include "afs/afs_stats.h"      /* afs statistics */
  16
  17
  18 int afs_osicred_initialized;
  19 afs_lock_t afs_xosi;            /* lock is for tvattr */
  20 extern struct osi_dev cacheDev;
  21 extern struct mount *afs_cacheVfsp;
  22
  23 void *
  24 osi_UFSOpen(afs_dcache_id_t *ainode)
  25 {
  26     struct osi_file *afile;
  27     struct vnode *vp;
  28     extern int cacheDiskType;
  29     afs_int32 code;
  30
  31     AFS_STATCNT(osi_UFSOpen);
  32     if (cacheDiskType != AFS_FCACHE_TYPE_UFS)
  33         osi_Panic("UFSOpen called for non-UFS cache\n");
  34     afile = osi_AllocSmallSpace(sizeof(struct osi_file));
  35     AFS_GUNLOCK();
  36     code = VFS_VGET(cacheDev.mp, (ino_t) ainode->ufs, &vp);
  37     AFS_GLOCK();
  38     if (code == 0 && vp->v_type == VNON)
  39         code = ENOENT;
  40     if (code) {
  41         osi_FreeSmallSpace(afile);
  42         osi_Panic("UFSOpen: igetinode failed");
  43     }
  44 #if defined(AFS_NBSD60_ENV)
  45     VOP_UNLOCK(vp);
  46 #else
  47     VOP_UNLOCK(vp, 0);
  48 #endif
  49     afile->vnode = vp;
  50     afile->size = VTOI(vp)->i_ffs1_size;
  51     afile->offset = 0;
  52     afile->proc = NULL;
  53     return (void *)afile;
  54 }
  55
  56 int
  57 afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat)
  58 {
  59     afs_int32 code;
  60     struct vattr tvattr;
  61
  62     AFS_STATCNT(osi_Stat);
  63     ObtainWriteLock(&afs_xosi, 320);
  64     AFS_GUNLOCK();
  65 #ifdef AFS_NBSD50_ENV
  66         code = VOP_GETATTR(afile->vnode, &tvattr, afs_osi_credp);
  67 #else
  68     code = VOP_GETATTR(afile->vnode, &tvattr, afs_osi_credp,
  69                        osi_curproc());
  70 #endif
  71     AFS_GLOCK();
  72     if (code == 0) {
  73         astat->size = afile->size = tvattr.va_size;
  74         astat->mtime = tvattr.va_mtime.tv_sec;
  75         astat->atime = tvattr.va_atime.tv_sec;
  76     }
  77     ReleaseWriteLock(&afs_xosi);
  78     return code;
  79 }
  80
  81 int
  82 osi_UFSClose(struct osi_file *afile)
  83 {
  84     AFS_STATCNT(osi_Close);
  85
  86     if (afile->vnode)
  87         AFS_RELE(afile->vnode);
  88
  89     osi_FreeSmallSpace(afile);
  90     return 0;
  91 }
  92
  93 int
  94 osi_UFSTruncate(struct osi_file *afile, afs_int32 asize)
  95 {
  96     struct vattr tvattr;
  97     afs_int32 code;
  98     struct osi_stat tstat;
  99
 100     AFS_STATCNT(osi_Truncate);
 101
 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
 111     ObtainWriteLock(&afs_xosi, 321);
 112     VATTR_NULL(&tvattr);
 113     tvattr.va_size = asize;
 114     AFS_GUNLOCK();
 115     VOP_LOCK(afile->vnode, LK_EXCLUSIVE | LK_RETRY);
 116 #ifdef AFS_NBSD50_ENV
 117     code = VOP_SETATTR(afile->vnode, &tvattr, afs_osi_credp);
 118 #else
 119     code = VOP_SETATTR(afile->vnode, &tvattr, afs_osi_credp,
 120                        osi_curproc());
 121 #endif
 122 #ifdef AFS_NBSD60_ENV
 123     VOP_UNLOCK(afile->vnode);
 124 #else
 125     VOP_UNLOCK(afile->vnode, 0);
 126 #endif
 127     AFS_GLOCK();
 128     if (code == 0)
 129         afile->size = asize;
 130     ReleaseWriteLock(&afs_xosi);
 131     return code;
 132 }
 133
 134 void
 135 osi_DisableAtimes(struct vnode *avp)
 136 {
 137 #if 0
 138     VTOI(avp)->i_flag &= ~IN_ACCESS;
 139 #endif
 140 }
 141
 142
 143 /* Generic read interface */
 144 int
 145 afs_osi_Read(struct osi_file *afile, int offset, void *aptr, afs_int32 asize)
 146 {
 147     size_t resid;
 148     afs_int32 code;
 149
 150     AFS_STATCNT(osi_Read);
 151
 152     /*
 153      * If the osi_file passed in is NULL, panic only if AFS is not shutting
 154      * down. No point in crashing when we are already shutting down
 155      */
 156     if (!afile) {
 157         if (afs_shuttingdown == AFS_RUNNING)
 158             osi_Panic("osi_Read called with null param");
 159         else
 160             return -EIO;
 161     }
 162
 163     if (offset != -1)
 164         afile->offset = offset;
 165     AFS_GUNLOCK();
 166     code =
 167         vn_rdwr(UIO_READ, afile->vnode, aptr, asize, afile->offset,
 168                 AFS_UIOSYS, IO_UNIT, afs_osi_credp, &resid,
 169                 osi_curproc());
 170     AFS_GLOCK();
 171     if (code == 0) {
 172         code = asize - resid;
 173         afile->offset += code;
 174         osi_DisableAtimes(afile->vnode);
 175     } else {
 176         afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, resid,
 177                    ICL_TYPE_INT32, code);
 178         if (code > 0) {
 179             code = -code;
 180         }
 181     }
 182     return code;
 183 }
 184
 185 /* Generic write interface */
 186 int
 187 afs_osi_Write(struct osi_file *afile, afs_int32 offset, void *aptr,
 188               afs_int32 asize)
 189 {
 190     size_t resid;
 191     afs_int32 code;
 192
 193     AFS_STATCNT(osi_Write);
 194     if (!afile)
 195         osi_Panic("afs_osi_Write called with null afile");
 196     if (offset != -1)
 197         afile->offset = offset;
 198
 199     AFS_GUNLOCK();
 200     code =
 201         vn_rdwr(UIO_WRITE, afile->vnode, aptr, asize, afile->offset,
 202                 AFS_UIOSYS, IO_UNIT, afs_osi_credp, &resid, osi_curproc());
 203     AFS_GLOCK();
 204
 205     if (code == 0) {
 206         code = asize - resid;
 207         afile->offset += code;
 208         if (afile->offset > afile->size)
 209             afile->size = afile->offset;
 210     } else {
 211         if (code > 0) {
 212             code = -code;
 213         }
 214     }
 215
 216     if (afile->proc)
 217         (*afile->proc) (afile, code);
 218
 219     return code;
 220 }
 221
 222 /*
 223  * This work should be handled by physstrat in ca/machdep.c.  This routine
 224  * written from the RT NFS port strategy routine.  It has been generalized a
 225  * bit, but should still be pretty clear.
 226  */
 227 int
 228 afs_osi_MapStrategy(int (*aproc)(struct buf *), struct buf *bp)
 229 {
 230     afs_int32 returnCode;
 231
 232     AFS_STATCNT(osi_MapStrategy);
 233     returnCode = (*aproc) (bp);
 234
 235     return returnCode;
 236 }
 237
 238 void
 239 shutdown_osifile(void)
 240 {
 241     AFS_STATCNT(shutdown_osifile);
 242     if (afs_cold_shutdown)
 243         afs_osicred_initialized = 0;
 244 }