tests/fs/puffs/h_dtfs/dtfs_vfsops.c

   1 /*      $NetBSD: dtfs_vfsops.c,v 1.3 2012/11/04 23:37:02 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 2006  Antti Kantee.  All Rights Reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/types.h>
  29 #include <sys/resource.h>
  30
  31 #include <stdio.h>
  32 #include <assert.h>
  33 #include <err.h>
  34 #include <errno.h>
  35 #include <puffs.h>
  36 #include <string.h>
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <util.h>
  40
  41 #include "dtfs.h"
  42
  43 static int
  44 rtstr(struct puffs_usermount *pu, const char *str, enum vtype vt)
  45 {
  46         struct puffs_node *pn = puffs_getroot(pu);
  47         struct vattr *va = &pn->pn_va;
  48         struct dtfs_file *df = DTFS_PTOF(pn);
  49         char ltarg[256+1];
  50
  51         if (sscanf(str, "%*s %256s", ltarg) != 1)
  52                 return 1;
  53
  54         dtfs_baseattrs(va, vt, 2);
  55         df->df_linktarget = estrdup(ltarg);
  56
  57         va->va_nlink = 1;
  58         va->va_size = strlen(df->df_linktarget);
  59
  60         puffs_setrootinfo(pu, vt, 0, 0);
  61
  62         return 0;
  63 }
  64
  65 static int
  66 rtdev(struct puffs_usermount *pu, const char *str, enum vtype vt)
  67 {
  68         struct puffs_node *pn = puffs_getroot(pu);
  69         struct vattr *va = &pn->pn_va;
  70         int major, minor;
  71
  72         if (sscanf(str, "%*s %d %d", &major, &minor) != 2)
  73                 return 1;
  74
  75         dtfs_baseattrs(va, vt, 2);
  76         va->va_nlink = 1;
  77         va->va_rdev = makedev(major, minor);
  78
  79         if (vt == VBLK)
  80                 va->va_mode |= S_IFBLK;
  81         else
  82                 va->va_mode |= S_IFCHR;
  83
  84         puffs_setrootinfo(pu, vt, 0, va->va_rdev);
  85
  86         return 0;
  87 }
  88
  89 static int
  90 rtnorm(struct puffs_usermount *pu, const char *str, enum vtype vt)
  91 {
  92         struct puffs_node *pn = puffs_getroot(pu);
  93         struct vattr *va = &pn->pn_va;
  94
  95         dtfs_baseattrs(va, vt, 2);
  96         if (vt == VDIR)
  97                 va->va_nlink = 2;
  98         else
  99                 va->va_nlink = 1;
 100
 101         puffs_setrootinfo(pu, vt, 0, 0);
 102
 103         return 0;
 104 }
 105
 106 struct rtype {
 107         char *tstr;
 108         enum vtype vt;
 109         int (*pfunc)(struct puffs_usermount *, const char *, enum vtype);
 110 } rtypes[] = {
 111         { "reg", VREG, rtnorm },
 112         { "dir", VDIR, rtnorm },
 113         { "blk", VBLK, rtdev },
 114         { "chr", VCHR, rtdev },
 115         { "lnk", VLNK, rtstr },
 116         { "sock", VSOCK, rtnorm },
 117         { "fifo", VFIFO, rtnorm }
 118 };
 119 #define NTYPES (sizeof(rtypes) / sizeof(rtypes[0]))
 120
 121 int
 122 dtfs_domount(struct puffs_usermount *pu, const char *typestr)
 123 {
 124         struct dtfs_mount *dtm;
 125         struct dtfs_file *dff;
 126         struct puffs_node *pn;
 127         int i;
 128
 129         /* create mount-local thingie */
 130         dtm = puffs_getspecific(pu);
 131         dtm->dtm_nextfileid = 3;
 132         dtm->dtm_nfiles = 1;
 133         dtm->dtm_fsizes = 0;
 134         LIST_INIT(&dtm->dtm_pollent);
 135
 136         /*
 137          * create root directory, do it "by hand" to avoid special-casing
 138          * dtfs_genfile()
 139          */
 140         dff = dtfs_newdir();
 141         dff->df_dotdot = NULL;
 142         pn = puffs_pn_new(pu, dff);
 143         if (!pn)
 144                 errx(1, "puffs_newpnode");
 145         puffs_setroot(pu, pn);
 146
 147         if (!typestr) {
 148                 rtnorm(pu, NULL, VDIR);
 149         } else {
 150                 for (i = 0; i < NTYPES; i++) {
 151                         if (strncmp(rtypes[i].tstr, typestr,
 152                             strlen(rtypes[i].tstr)) == 0) {
 153                                 if (rtypes[i].pfunc(pu, typestr,
 154                                     rtypes[i].vt) != 0) {
 155                                         fprintf(stderr, "failed to parse "
 156                                             "\"%s\"\n", typestr);
 157                                         return 1;
 158                                 }
 159                                 break;
 160                         }
 161                 }
 162                 if (i == NTYPES) {
 163                         fprintf(stderr, "no maching type for %s\n", typestr);
 164                         return 1;
 165                 }
 166         }
 167
 168         return 0;
 169 }
 170
 171 /*
 172  * statvfs() should fill in the following members of struct statvfs:
 173  *
 174  * unsigned long   f_bsize;         file system block size
 175  * unsigned long   f_frsize;        fundamental file system block size
 176  * unsigned long   f_iosize;        optimal file system block size
 177  * fsblkcnt_t      f_blocks;        number of blocks in file system,
 178  *                                            (in units of f_frsize)
 179  *
 180  * fsblkcnt_t      f_bfree;         free blocks avail in file system
 181  * fsblkcnt_t      f_bavail;        free blocks avail to non-root
 182  * fsblkcnt_t      f_bresvd;        blocks reserved for root
 183  *
 184  * fsfilcnt_t      f_files;         total file nodes in file system
 185  * fsfilcnt_t      f_ffree;         free file nodes in file system
 186  * fsfilcnt_t      f_favail;        free file nodes avail to non-root
 187  * fsfilcnt_t      f_fresvd;        file nodes reserved for root
 188  *
 189  *
 190  * The rest are filled in by the kernel.
 191  */
 192 #define ROUND(a,b) (((a) + ((b)-1)) & ~((b)-1))
 193 #define NFILES 1024*1024
 194 int
 195 dtfs_fs_statvfs(struct puffs_usermount *pu, struct statvfs *sbp)
 196 {
 197         struct rlimit rlim;
 198         struct dtfs_mount *dtm;
 199         off_t btot, bfree;
 200         int pgsize;
 201
 202         dtm = puffs_getspecific(pu);
 203         pgsize = getpagesize();
 204         memset(sbp, 0, sizeof(struct statvfs));
 205
 206         /*
 207          * Use datasize rlimit as an _approximation_ for free size.
 208          * This, of course, is not accurate due to overhead and not
 209          * accounting for metadata.
 210          */
 211         if (getrlimit(RLIMIT_DATA, &rlim) == 0)
 212                 btot = rlim.rlim_cur;
 213         else
 214                 btot = 16*1024*1024;
 215         bfree = btot - dtm->dtm_fsizes;
 216
 217         sbp->f_blocks = ROUND(btot, pgsize) / pgsize;
 218         sbp->f_files = NFILES;
 219
 220         sbp->f_bsize = sbp->f_frsize = sbp->f_iosize = pgsize;
 221         sbp->f_bfree = sbp->f_bavail = ROUND(bfree, pgsize) / pgsize;
 222         sbp->f_ffree = sbp->f_favail = NFILES - dtm->dtm_nfiles;
 223
 224         sbp->f_bresvd = sbp->f_fresvd = 0;
 225
 226         return 0;
 227 }
 228 #undef ROUND
 229
 230 static void *
 231 addrcmp(struct puffs_usermount *pu, struct puffs_node *pn, void *arg)
 232 {
 233
 234         if (pn == arg)
 235                 return pn;
 236
 237         return NULL;
 238 }
 239
 240 int
 241 dtfs_fs_fhtonode(struct puffs_usermount *pu, void *fid, size_t fidsize,
 242         struct puffs_newinfo *pni)
 243 {
 244         struct dtfs_fid *dfid;
 245         struct puffs_node *pn;
 246
 247         assert(fidsize == sizeof(struct dtfs_fid));
 248         dfid = fid;
 249
 250         pn = puffs_pn_nodewalk(pu, addrcmp, dfid->dfid_addr);
 251         if (pn == NULL)
 252                 return ESTALE;
 253
 254         if (pn->pn_va.va_fileid != dfid->dfid_fileid
 255             || pn->pn_va.va_gen != dfid->dfid_gen)
 256                 return ESTALE;
 257
 258         puffs_newinfo_setcookie(pni, pn);
 259         puffs_newinfo_setvtype(pni, pn->pn_va.va_type);
 260         puffs_newinfo_setsize(pni, pn->pn_va.va_size);
 261         puffs_newinfo_setrdev(pni, pn->pn_va.va_rdev);
 262
 263         return 0;
 264 }
 265
 266 int
 267 dtfs_fs_nodetofh(struct puffs_usermount *pu, void *cookie,
 268         void *fid, size_t *fidsize)
 269 {
 270         struct puffs_node *pn = cookie;
 271         struct dtfs_fid *dfid;
 272         extern int dynamicfh;
 273
 274         if (dynamicfh == 0) {
 275                 assert(*fidsize >= sizeof(struct dtfs_fid));
 276         } else {
 277                 if (*fidsize < sizeof(struct dtfs_fid)) {
 278                         *fidsize = sizeof(struct dtfs_fid);
 279                         return E2BIG;
 280                 }
 281                 *fidsize = sizeof(struct dtfs_fid);
 282         }
 283
 284         dfid = fid;
 285
 286         dfid->dfid_addr = pn;
 287         dfid->dfid_fileid = pn->pn_va.va_fileid;
 288         dfid->dfid_gen = pn->pn_va.va_gen;
 289
 290         return 0;
 291 }
 292
 293 int
 294 dtfs_fs_unmount(struct puffs_usermount *pu, int flags)
 295 {
 296
 297         return 0;
 298 }