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
rtstr(struct puffs_usermount * pu,const char * str,enum vtype vt)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
rtdev(struct puffs_usermount * pu,const char * str,enum vtype vt)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
rtnorm(struct puffs_usermount * pu,const char * str,enum vtype vt)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
dtfs_domount(struct puffs_usermount * pu,const char * typestr)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
dtfs_fs_statvfs(struct puffs_usermount * pu,struct statvfs * sbp)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 *
addrcmp(struct puffs_usermount * pu,struct puffs_node * pn,void * arg)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
dtfs_fs_fhtonode(struct puffs_usermount * pu,void * fid,size_t fidsize,struct puffs_newinfo * pni)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
dtfs_fs_nodetofh(struct puffs_usermount * pu,void * cookie,void * fid,size_t * fidsize)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
dtfs_fs_unmount(struct puffs_usermount * pu,int flags)294 dtfs_fs_unmount(struct puffs_usermount *pu, int flags)
295 {
296
297 return 0;
298 }
299