src/afs/AIX/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
  18
  19 int afs_osicred_initialized = 0;
  20 afs_ucred_t afs_osi_cred;
  21 extern struct osi_dev cacheDev;
  22 extern struct vfs *afs_cacheVfsp;
  23
  24
  25 void *
  26 osi_UFSOpen(afs_dcache_id_t *ainode)
  27 {
  28     struct inode *ip;
  29     struct osi_file *afile = NULL;
  30     struct vnode *vp = NULL;
  31     extern int cacheDiskType;
  32     afs_int32 code = 0;
  33     int dummy;
  34     AFS_STATCNT(osi_UFSOpen);
  35     if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
  36         osi_Panic("UFSOpen called for non-UFS cache\n");
  37     }
  38     if (!afs_osicred_initialized) {
  39         /* valid for alpha_osf, SunOS, Ultrix */
  40         memset(&afs_osi_cred, 0, sizeof(afs_ucred_t));
  41         crhold(&afs_osi_cred);  /* don't let it evaporate, since it is static */
  42         afs_osicred_initialized = 1;
  43     }
  44     afile = osi_AllocSmallSpace(sizeof(struct osi_file));
  45     setuerror(0);
  46     AFS_GUNLOCK();
  47     ip = (struct inode *)igetinode((dev_t) cacheDev.dev, afs_cacheVfsp,
  48                                    (ino_t) ainode->ufs, &vp, &dummy);
  49     AFS_GLOCK();
  50     if (getuerror()) {
  51         osi_FreeSmallSpace(afile);
  52         osi_Panic("UFSOpen: igetinode failed");
  53     }
  54     afile->vnode = vp;          /* Save the vnode pointer for the inode ip; also ip is already prele'ed in igetinode */
  55     afile->size = VTOI(afile->vnode)->i_size;
  56     afile->offset = 0;
  57     afile->proc = (int (*)())0;
  58     return (void *)afile;
  59 }
  60
  61 int
  62 afs_osi_Stat(struct osi_file *afile, struct osi_stat *astat)
  63 {
  64     afs_int32 code;
  65     struct vattr tvattr;
  66     AFS_STATCNT(osi_Stat);
  67     AFS_GUNLOCK();
  68     code = VNOP_GETATTR(afile->vnode, &tvattr, &afs_osi_cred);
  69     AFS_GLOCK();
  70     if (code == 0) {
  71         astat->size = tvattr.va_size;
  72         astat->mtime = tvattr.va_mtime.tv_sec;
  73         astat->atime = tvattr.va_atime.tv_sec;
  74     }
  75     return code;
  76 }
  77
  78 int
  79 osi_UFSClose(struct osi_file *afile)
  80 {
  81     AFS_STATCNT(osi_Close);
  82     if (afile->vnode) {
  83         /* AIX writes entire data regions at a time when dumping core. We've
  84          * seen a 26M write go through the system. When this happens, we run
  85          * out of available pages. So, we'll flush the vnode's vm if we're short
  86          * on space.
  87          */
  88         if (vmPageHog) {
  89             int code;
  90             if (afile->vnode->v_gnode->gn_seg) {
  91                 /* 524287 is the max number of pages for a file. See test in
  92                  * vm_writep.
  93                  */
  94                 code = vm_writep(afile->vnode->v_gnode->gn_seg, 0, 524287);
  95             }
  96         }
  97         AFS_RELE(afile->vnode);
  98     }
  99
 100     osi_FreeSmallSpace(afile);
 101     return 0;
 102 }
 103
 104 int
 105 osi_UFSTruncate(struct osi_file *afile, afs_int32 asize)
 106 {
 107     afs_ucred_t *oldCred;
 108     struct vattr tvattr;
 109     afs_int32 code;
 110     struct osi_stat tstat;
 111     afs_int32 mode = FWRITE | FSYNC;
 112     AFS_STATCNT(osi_Truncate);
 113
 114     /* This routine only shrinks files, and most systems
 115      * have very slow truncates, even when the file is already
 116      * small enough.  Check now and save some time.
 117      */
 118     code = afs_osi_Stat(afile, &tstat);
 119     if (code || tstat.size <= asize)
 120         return code;
 121     /*
 122      * If we're truncating an unopened file to a non-zero length,
 123      * we need to bind it to a vm segment
 124      * Note that  that the binding will actually happen inside
 125      * jfs by xix_ftrunc; setting mode to 0 will enable that.
 126      */
 127     if (asize && !VTOGP(afile->vnode)->gn_seg)
 128         mode = 0;
 129     AFS_GUNLOCK();
 130     code = VNOP_FTRUNC(afile->vnode, mode, asize, (caddr_t) 0, &afs_osi_cred);
 131     AFS_GLOCK();
 132     return code;
 133 }
 134
 135 void
 136 osi_DisableAtimes(struct vnode *avp)
 137 {
 138     struct inode *ip = VTOIP(avp);
 139     ip->i_flag &= ~IACC;
 140 }
 141
 142
 143 /* Generic read interface */
 144 int
 145 afs_osi_Read(struct osi_file *afile, int offset, void *aptr,
 146              afs_int32 asize)
 147 {
 148     afs_ucred_t *oldCred;
 149     unsigned int resid;
 150     afs_int32 code;
 151     afs_int32 cnt1 = 0;
 152     AFS_STATCNT(osi_Read);
 153
 154     /**
 155      * If the osi_file passed in is NULL, panic only if AFS is not shutting
 156      * down. No point in crashing when we are already shutting down
 157      */
 158     if (!afile) {
 159         if (afs_shuttingdown == AFS_RUNNING)
 160             osi_Panic("osi_Read called with null param");
 161         else
 162             return -EIO;
 163     }
 164
 165     if (offset != -1)
 166         afile->offset = offset;
 167   retry_IO:
 168     /* Note the difference in the way the afile->offset is passed (see comments in gop_rdwr() in afs_aix_subr.c for comments) */
 169     AFS_GUNLOCK();
 170 #ifdef AFS_64BIT_KERNEL
 171     code =
 172         gop_rdwr(UIO_READ, afile->vnode, (caddr_t) aptr, asize,
 173                  &afile->offset, AFS_UIOSYS, NULL, &resid);
 174 #else
 175     code =
 176         gop_rdwr(UIO_READ, afile->vnode, (caddr_t) aptr, asize,
 177                  (off_t) & afile->offset, AFS_UIOSYS, NULL, &resid);
 178 #endif
 179     AFS_GLOCK();
 180     if (code == 0) {
 181         code = asize - resid;
 182         afile->offset += code;
 183         osi_DisableAtimes(afile->vnode);
 184     } else {
 185         afs_Trace2(afs_iclSetp, CM_TRACE_READFAILED, ICL_TYPE_INT32, resid,
 186                    ICL_TYPE_INT32, code);
 187         /*
 188          * To handle periodic low-level EFAULT failures that we've seen with the
 189          * Weitek chip; in all observed failed cases a second read succeeded.
 190          */
 191         if ((code == EFAULT) && (cnt1++ < 5)) {
 192             afs_stats_cmperf.osiread_efaults++;
 193             goto retry_IO;
 194         }
 195         setuerror(code);
 196         if (code > 0) {
 197             code = -code;
 198         }
 199     }
 200     return code;
 201 }
 202
 203 /* Generic write interface */
 204 int
 205 afs_osi_Write(struct osi_file *afile, afs_int32 offset, void *aptr,
 206               afs_int32 asize)
 207 {
 208     afs_ucred_t *oldCred;
 209     unsigned int resid;
 210     afs_int32 code;
 211     AFS_STATCNT(osi_Write);
 212     if (!afile)
 213         osi_Panic("afs_osi_Write called with null param");
 214     if (offset != -1)
 215         afile->offset = offset;
 216     /* Note the difference in the way the afile->offset is passed (see comments in gop_rdwr() in afs_aix_subr.c for comments) */
 217     AFS_GUNLOCK();
 218 #ifdef AFS_64BIT_KERNEL
 219     code =
 220         gop_rdwr(UIO_WRITE, afile->vnode, (caddr_t) aptr, asize,
 221                  &afile->offset, AFS_UIOSYS, NULL, &resid);
 222 #else
 223     code =
 224         gop_rdwr(UIO_WRITE, afile->vnode, (caddr_t) aptr, asize,
 225                  (off_t) & afile->offset, AFS_UIOSYS, NULL, &resid);
 226 #endif
 227     AFS_GLOCK();
 228     if (code == 0) {
 229         if (resid)
 230             afs_Trace3(afs_iclSetp, CM_TRACE_WRITEFAILED, ICL_TYPE_INT32,
 231                        asize, ICL_TYPE_INT32, resid, ICL_TYPE_INT32, code);
 232         code = asize - resid;
 233         afile->offset += code;
 234     } else {
 235         afs_Trace3(afs_iclSetp, CM_TRACE_WRITEFAILED, ICL_TYPE_INT32, asize,
 236                    ICL_TYPE_INT32, resid, ICL_TYPE_INT32, code);
 237         if (code == ENOSPC)
 238             afs_WarnENOSPC();
 239         setuerror(code);
 240         if (code > 0) {
 241             code = -code;
 242         }
 243     }
 244     if (afile->proc) {
 245         (*afile->proc) (afile, code);
 246     }
 247     return code;
 248 }
 249
 250
 251 /*  This work should be handled by physstrat in ca/machdep.c.
 252     This routine written from the RT NFS port strategy routine.
 253     It has been generalized a bit, but should still be pretty clear. */
 254 int
 255 afs_osi_MapStrategy(int (*aproc) (), struct buf *bp)
 256 {
 257     afs_int32 returnCode;
 258
 259     AFS_STATCNT(osi_MapStrategy);
 260     returnCode = (*aproc) (bp);
 261
 262     return returnCode;
 263 }
 264
 265
 266
 267 void
 268 shutdown_osifile(void)
 269 {
 270     AFS_STATCNT(shutdown_osifile);
 271     if (afs_cold_shutdown) {
 272         afs_osicred_initialized = 0;
 273     }
 274 }