2 5551e51d 2006-07-23 devnull * 9P to FUSE translator. Acts as FUSE server, 9P client.
3 5551e51d 2006-07-23 devnull * Mounts 9P servers via FUSE kernel module.
5 5551e51d 2006-07-23 devnull * There are four procs in this threaded program
6 5551e51d 2006-07-23 devnull * (ignoring the one that runs main and then exits).
7 5551e51d 2006-07-23 devnull * The first proc reads FUSE requests from /dev/fuse.
8 5551e51d 2006-07-23 devnull * It sends the requests over a channel to a second proc,
9 5551e51d 2006-07-23 devnull * which serves the requests. Each request runs in a
10 5551e51d 2006-07-23 devnull * thread in that second proc. Those threads do write
11 5551e51d 2006-07-23 devnull * FUSE replies, which in theory might block, but in practice don't.
12 5551e51d 2006-07-23 devnull * The 9P interactions are handled by lib9pclient, which
13 5551e51d 2006-07-23 devnull * allocates two more procs, one for reading and one for
14 5551e51d 2006-07-23 devnull * writing the 9P connection. Thus the many threads in the
15 5551e51d 2006-07-23 devnull * request proc can do 9P interactions without blocking.
18 05f50fe6 2006-07-23 devnull #define _GNU_SOURCE 1 /* for O_DIRECTORY on Linux */
19 5551e51d 2006-07-23 devnull #include "a.h"
21 05f50fe6 2006-07-23 devnull /* GNUisms */
22 05f50fe6 2006-07-23 devnull #ifndef O_DIRECTORY
23 05f50fe6 2006-07-23 devnull #define O_DIRECTORY 0
26 05f50fe6 2006-07-23 devnull #ifndef O_LARGEFILE
27 7dc6d244 2008-06-19 rsc # define O_LARGEFILE 0
31 7dc6d244 2008-06-19 rsc * Work around glibc's broken <bits/fcntl.h> which defines
32 7dc6d244 2008-06-19 rsc * O_LARGEFILE to 0 on 64 bit architectures. But, on those same
33 7dc6d244 2008-06-19 rsc * architectures, linux _forces_ O_LARGEFILE (which is always
34 7dc6d244 2008-06-19 rsc * 0100000 in the kernel) at each file open. FUSE is all too
35 7dc6d244 2008-06-19 rsc * happy to pass the flag onto us, where we'd have no idea what
36 7dc6d244 2008-06-19 rsc * to do with it if we trusted glibc.
38 7dc6d244 2008-06-19 rsc #if defined(__linux__)
39 7dc6d244 2008-06-19 rsc # undef O_LARGEFILE
40 7dc6d244 2008-06-19 rsc # define O_LARGEFILE 0100000
43 83ab7d88 2007-11-27 rsc #ifndef O_CLOEXEC
44 83ab7d88 2007-11-27 rsc # if defined(__linux__)
45 83ab7d88 2007-11-27 rsc # define O_CLOEXEC 02000000 /* Sigh */
47 83ab7d88 2007-11-27 rsc # define O_CLOEXEC 0
51 5551e51d 2006-07-23 devnull int debug;
52 5551e51d 2006-07-23 devnull char *argv0;
53 9ec386fe 2007-06-21 devnull char *aname = "";
54 5551e51d 2006-07-23 devnull void fusedispatch(void*);
55 5551e51d 2006-07-23 devnull Channel *fusechan;
59 5551e51d 2006-07-23 devnull STACK = 8192
63 5551e51d 2006-07-23 devnull * The number of seconds that the kernel can cache
64 5551e51d 2006-07-23 devnull * returned file attributes. FUSE's default is 1.0.
65 5551e51d 2006-07-23 devnull * I haven't experimented with using 0.
67 5551e51d 2006-07-23 devnull double attrtimeout = 1.0;
70 5551e51d 2006-07-23 devnull * The number of seconds that the kernel can cache
71 5551e51d 2006-07-23 devnull * the returned entry nodeids returned by lookup.
72 5551e51d 2006-07-23 devnull * I haven't experimented with other values.
74 5551e51d 2006-07-23 devnull double entrytimeout = 1.0;
76 5551e51d 2006-07-23 devnull CFsys *fsys;
77 5551e51d 2006-07-23 devnull CFid *fsysroot;
78 9ec386fe 2007-06-21 devnull void init9p(char*, char*);
81 5551e51d 2006-07-23 devnull usage(void)
83 9ec386fe 2007-06-21 devnull fprint(2, "usage: 9pfuse [-D] [-A attrtimeout] [-a aname] address mtpt\n");
87 5551e51d 2006-07-23 devnull void fusereader(void*);
88 e63025d0 2008-04-17 rsc void watchfd(void*);
91 5551e51d 2006-07-23 devnull threadmain(int argc, char **argv)
93 5551e51d 2006-07-23 devnull ARGBEGIN{
94 5551e51d 2006-07-23 devnull case 'D':
95 5551e51d 2006-07-23 devnull chatty9pclient++;
98 9ec386fe 2007-06-21 devnull case 'A':
99 5551e51d 2006-07-23 devnull attrtimeout = atof(EARGF(usage()));
101 9ec386fe 2007-06-21 devnull case 'a':
102 9ec386fe 2007-06-21 devnull aname = EARGF(usage());
104 5551e51d 2006-07-23 devnull default:
105 5551e51d 2006-07-23 devnull usage();
108 5551e51d 2006-07-23 devnull if(argc != 2)
109 5551e51d 2006-07-23 devnull usage();
111 5551e51d 2006-07-23 devnull quotefmtinstall();
112 5551e51d 2006-07-23 devnull fmtinstall('F', fcallfmt);
113 5551e51d 2006-07-23 devnull fmtinstall('M', dirmodefmt);
114 5551e51d 2006-07-23 devnull fmtinstall('G', fusefmt);
116 a695bc7d 2006-07-23 devnull setsid(); /* won't be able to use console, but can't be interrupted */
118 9ec386fe 2007-06-21 devnull init9p(argv[0], aname);
119 5551e51d 2006-07-23 devnull initfuse(argv[1]);
121 5551e51d 2006-07-23 devnull fusechan = chancreate(sizeof(void*), 0);
122 5551e51d 2006-07-23 devnull proccreate(fusedispatch, nil, STACK);
123 5551e51d 2006-07-23 devnull sendp(fusechan, nil); /* sync */
125 5551e51d 2006-07-23 devnull proccreate(fusereader, nil, STACK);
127 a83ccf38 2006-07-27 devnull * Now that we're serving FUSE, we can wait
128 a83ccf38 2006-07-27 devnull * for the mount to finish and exit back to the user.
130 a83ccf38 2006-07-27 devnull waitfuse();
131 5551e51d 2006-07-23 devnull threadexits(0);
135 5551e51d 2006-07-23 devnull fusereader(void *v)
137 5551e51d 2006-07-23 devnull FuseMsg *m;
139 5551e51d 2006-07-23 devnull while((m = readfusemsg()) != nil)
140 5551e51d 2006-07-23 devnull sendp(fusechan, m);
142 5551e51d 2006-07-23 devnull fusemtpt = nil; /* no need to unmount */
143 5551e51d 2006-07-23 devnull threadexitsall(0);
147 9ec386fe 2007-06-21 devnull init9p(char *addr, char *spec)
151 e63025d0 2008-04-17 rsc if(strcmp(addr, "-") == 0)
154 e63025d0 2008-04-17 rsc if((fd = dial(netmkaddr(addr, "tcp", "564"), nil, nil, nil)) < 0)
155 e63025d0 2008-04-17 rsc sysfatal("dial %s: %r", addr);
156 e63025d0 2008-04-17 rsc proccreate(watchfd, (void*)(uintptr)fd, STACK);
157 9ec386fe 2007-06-21 devnull if((fsys = fsmount(fd, spec)) == nil)
158 5551e51d 2006-07-23 devnull sysfatal("fsmount: %r");
159 5551e51d 2006-07-23 devnull fsysroot = fsroot(fsys);
163 5551e51d 2006-07-23 devnull * FUSE uses nodeids to refer to active "struct inodes"
164 5551e51d 2006-07-23 devnull * (9P's unopened fids). FUSE uses fhs to refer to active
165 5551e51d 2006-07-23 devnull * "struct fuse_files" (9P's opened fids). The choice of
166 5551e51d 2006-07-23 devnull * numbers is up to us except that nodeid 1 is the root directory.
167 5551e51d 2006-07-23 devnull * We use the same number space for both and call the
168 5551e51d 2006-07-23 devnull * bookkeeping structure a FuseFid.
170 5551e51d 2006-07-23 devnull * FUSE requires nodeids to have associated generation
171 5551e51d 2006-07-23 devnull * numbers. If we reuse a nodeid, we have to bump the
172 5551e51d 2006-07-23 devnull * generation number to guarantee that the nodeid,gen
173 5551e51d 2006-07-23 devnull * combination is never reused.
175 5551e51d 2006-07-23 devnull * There are also inode numbers returned in directory reads
176 5551e51d 2006-07-23 devnull * and file attributes, but these do NOT need to match the nodeids.
177 5551e51d 2006-07-23 devnull * We use a combination of qid.path and qid.type as the inode
178 5551e51d 2006-07-23 devnull * number.
181 5551e51d 2006-07-23 devnull * TO DO: reference count the fids.
183 5551e51d 2006-07-23 devnull typedef struct Fusefid Fusefid;
184 5551e51d 2006-07-23 devnull struct Fusefid
186 5551e51d 2006-07-23 devnull Fusefid *next;
187 5551e51d 2006-07-23 devnull CFid *fid;
188 5551e51d 2006-07-23 devnull int ref;
190 5551e51d 2006-07-23 devnull int gen;
191 5551e51d 2006-07-23 devnull int isnodeid;
193 5551e51d 2006-07-23 devnull /* directory read state */
194 5551e51d 2006-07-23 devnull Dir *d0;
197 5551e51d 2006-07-23 devnull int off;
200 5551e51d 2006-07-23 devnull Fusefid **fusefid;
201 5551e51d 2006-07-23 devnull int nfusefid;
202 5551e51d 2006-07-23 devnull Fusefid *freefusefidlist;
204 5551e51d 2006-07-23 devnull Fusefid*
205 5551e51d 2006-07-23 devnull allocfusefid(void)
207 5551e51d 2006-07-23 devnull Fusefid *f;
209 5551e51d 2006-07-23 devnull if((f = freefusefidlist) == nil){
210 5551e51d 2006-07-23 devnull f = emalloc(sizeof *f);
211 5551e51d 2006-07-23 devnull fusefid = erealloc(fusefid, (nfusefid+1)*sizeof *fusefid);
212 5551e51d 2006-07-23 devnull f->id = nfusefid;
213 5551e51d 2006-07-23 devnull fusefid[f->id] = f;
214 5551e51d 2006-07-23 devnull nfusefid++;
216 5551e51d 2006-07-23 devnull freefusefidlist = f->next;
217 5551e51d 2006-07-23 devnull f->next = nil;
218 5551e51d 2006-07-23 devnull f->ref = 1;
219 5551e51d 2006-07-23 devnull f->isnodeid = -1;
220 5551e51d 2006-07-23 devnull return f;
224 5551e51d 2006-07-23 devnull freefusefid(Fusefid *f)
226 5551e51d 2006-07-23 devnull if(--f->ref > 0)
228 5551e51d 2006-07-23 devnull assert(f->ref == 0);
229 5551e51d 2006-07-23 devnull if(f->fid)
230 5551e51d 2006-07-23 devnull fsclose(f->fid);
231 5551e51d 2006-07-23 devnull if(f->d0)
232 5551e51d 2006-07-23 devnull free(f->d0);
233 5551e51d 2006-07-23 devnull f->off = 0;
234 5551e51d 2006-07-23 devnull f->d0 = nil;
235 5551e51d 2006-07-23 devnull f->fid = nil;
236 5551e51d 2006-07-23 devnull f->d = nil;
237 5551e51d 2006-07-23 devnull f->nd = 0;
238 5551e51d 2006-07-23 devnull f->next = freefusefidlist;
239 5551e51d 2006-07-23 devnull f->isnodeid = -1;
240 5551e51d 2006-07-23 devnull freefusefidlist = f;
244 5551e51d 2006-07-23 devnull _alloc(CFid *fid, int isnodeid)
246 5551e51d 2006-07-23 devnull Fusefid *ff;
248 5551e51d 2006-07-23 devnull ff = allocfusefid();
249 5551e51d 2006-07-23 devnull ff->fid = fid;
250 5551e51d 2006-07-23 devnull ff->isnodeid = isnodeid;
251 5551e51d 2006-07-23 devnull ff->gen++;
252 5551e51d 2006-07-23 devnull return ff->id+2; /* skip 0 and 1 */
256 5551e51d 2006-07-23 devnull allocfh(CFid *fid)
258 5551e51d 2006-07-23 devnull return _alloc(fid, 0);
261 5551e51d 2006-07-23 devnull allocnodeid(CFid *fid)
263 5551e51d 2006-07-23 devnull return _alloc(fid, 1);
266 5551e51d 2006-07-23 devnull Fusefid*
267 5551e51d 2006-07-23 devnull lookupfusefid(uvlong id, int isnodeid)
269 5551e51d 2006-07-23 devnull Fusefid *ff;
270 5551e51d 2006-07-23 devnull if(id < 2 || id >= nfusefid+2)
271 5551e51d 2006-07-23 devnull return nil;
272 5551e51d 2006-07-23 devnull ff = fusefid[(int)id-2];
273 5551e51d 2006-07-23 devnull if(ff->isnodeid != isnodeid)
274 5551e51d 2006-07-23 devnull return nil;
275 5551e51d 2006-07-23 devnull return ff;
279 5551e51d 2006-07-23 devnull _lookupcfid(uvlong id, int isnodeid)
281 5551e51d 2006-07-23 devnull Fusefid *ff;
283 5551e51d 2006-07-23 devnull if((ff = lookupfusefid(id, isnodeid)) == nil)
284 5551e51d 2006-07-23 devnull return nil;
285 5551e51d 2006-07-23 devnull return ff->fid;
289 5551e51d 2006-07-23 devnull fh2fid(uvlong fh)
291 5551e51d 2006-07-23 devnull return _lookupcfid(fh, 0);
295 5551e51d 2006-07-23 devnull nodeid2fid(uvlong nodeid)
297 5551e51d 2006-07-23 devnull if(nodeid == 1)
298 5551e51d 2006-07-23 devnull return fsysroot;
299 5551e51d 2006-07-23 devnull return _lookupcfid(nodeid, 1);
303 5551e51d 2006-07-23 devnull qid2inode(Qid q)
305 5551e51d 2006-07-23 devnull return q.path | ((uvlong)q.type<<56);
309 5551e51d 2006-07-23 devnull dir2attr(Dir *d, struct fuse_attr *attr)
311 5551e51d 2006-07-23 devnull attr->ino = qid2inode(d->qid);
312 5551e51d 2006-07-23 devnull attr->size = d->length;
313 5551e51d 2006-07-23 devnull attr->blocks = (d->length+8191)/8192;
314 5551e51d 2006-07-23 devnull attr->atime = d->atime;
315 5551e51d 2006-07-23 devnull attr->mtime = d->mtime;
316 5551e51d 2006-07-23 devnull attr->ctime = d->mtime; /* not right */
317 5551e51d 2006-07-23 devnull attr->atimensec = 0;
318 5551e51d 2006-07-23 devnull attr->mtimensec = 0;
319 5551e51d 2006-07-23 devnull attr->ctimensec = 0;
320 5551e51d 2006-07-23 devnull attr->mode = d->mode&0777;
321 5551e51d 2006-07-23 devnull if(d->mode&DMDIR)
322 5551e51d 2006-07-23 devnull attr->mode |= S_IFDIR;
323 d07db89b 2008-07-04 rsc else if(d->mode&DMSYMLINK)
324 d07db89b 2008-07-04 rsc attr->mode |= S_IFLNK;
326 5551e51d 2006-07-23 devnull attr->mode |= S_IFREG;
327 5551e51d 2006-07-23 devnull attr->nlink = 1; /* works for directories! - see FUSE FAQ */
328 5551e51d 2006-07-23 devnull attr->uid = getuid();
329 5551e51d 2006-07-23 devnull attr->gid = getgid();
330 5551e51d 2006-07-23 devnull attr->rdev = 0;
334 5551e51d 2006-07-23 devnull f2timeout(double f, __u64 *s, __u32 *ns)
337 5551e51d 2006-07-23 devnull *ns = (f - (int)f)*1e9;
341 5551e51d 2006-07-23 devnull dir2attrout(Dir *d, struct fuse_attr_out *out)
343 5551e51d 2006-07-23 devnull f2timeout(attrtimeout, &out->attr_valid, &out->attr_valid_nsec);
344 5551e51d 2006-07-23 devnull dir2attr(d, &out->attr);
348 5551e51d 2006-07-23 devnull * Lookup. Walk to the name given as the argument.
349 5551e51d 2006-07-23 devnull * The response is a fuse_entry_out giving full stat info.
352 5551e51d 2006-07-23 devnull fuselookup(FuseMsg *m)
354 5551e51d 2006-07-23 devnull char *name;
355 5551e51d 2006-07-23 devnull Fusefid *ff;
356 5551e51d 2006-07-23 devnull CFid *fid, *newfid;
358 5551e51d 2006-07-23 devnull struct fuse_entry_out out;
360 5551e51d 2006-07-23 devnull name = m->tx;
361 5551e51d 2006-07-23 devnull if((fid = nodeid2fid(m->hdr->nodeid)) == nil){
362 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
365 5551e51d 2006-07-23 devnull if(strchr(name, '/')){
366 5551e51d 2006-07-23 devnull replyfuseerrno(m, ENOENT);
369 5551e51d 2006-07-23 devnull if((newfid = fswalk(fid, name)) == nil){
370 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
373 5551e51d 2006-07-23 devnull if((d = fsdirfstat(newfid)) == nil){
374 5551e51d 2006-07-23 devnull fsclose(newfid);
375 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
378 5551e51d 2006-07-23 devnull out.nodeid = allocnodeid(newfid);
379 5551e51d 2006-07-23 devnull ff = lookupfusefid(out.nodeid, 1);
380 5551e51d 2006-07-23 devnull out.generation = ff->gen;
381 5551e51d 2006-07-23 devnull f2timeout(attrtimeout, &out.attr_valid, &out.attr_valid_nsec);
382 5551e51d 2006-07-23 devnull f2timeout(entrytimeout, &out.entry_valid, &out.entry_valid_nsec);
383 5551e51d 2006-07-23 devnull dir2attr(d, &out.attr);
384 5551e51d 2006-07-23 devnull free(d);
385 5551e51d 2006-07-23 devnull replyfuse(m, &out, sizeof out);
389 5551e51d 2006-07-23 devnull * Forget. Reference-counted clunk for nodeids.
390 5551e51d 2006-07-23 devnull * Does not send a reply.
391 5551e51d 2006-07-23 devnull * Each lookup response gives the kernel an additional reference
392 5551e51d 2006-07-23 devnull * to the returned nodeid. Forget says "drop this many references
393 5551e51d 2006-07-23 devnull * to this nodeid". Our fuselookup, when presented with the same query,
394 5551e51d 2006-07-23 devnull * does not return the same results (it allocates a new nodeid for each
395 5551e51d 2006-07-23 devnull * call), but if that ever changes, fuseforget already handles the ref
396 5551e51d 2006-07-23 devnull * counts properly.
399 5551e51d 2006-07-23 devnull fuseforget(FuseMsg *m)
401 5551e51d 2006-07-23 devnull struct fuse_forget_in *in;
402 5551e51d 2006-07-23 devnull Fusefid *ff;
404 5551e51d 2006-07-23 devnull in = m->tx;
405 5551e51d 2006-07-23 devnull if((ff = lookupfusefid(m->hdr->nodeid, 1)) == nil)
407 5551e51d 2006-07-23 devnull if(ff->ref > in->nlookup){
408 5551e51d 2006-07-23 devnull ff->ref -= in->nlookup;
411 5551e51d 2006-07-23 devnull if(ff->ref < in->nlookup)
412 5551e51d 2006-07-23 devnull fprint(2, "bad count in forget\n");
413 5551e51d 2006-07-23 devnull ff->ref = 1;
414 5551e51d 2006-07-23 devnull freefusefid(ff);
418 5551e51d 2006-07-23 devnull * Getattr.
419 5551e51d 2006-07-23 devnull * Replies with a fuse_attr_out structure giving the
420 5551e51d 2006-07-23 devnull * attr for the requested nodeid in out.attr.
421 5551e51d 2006-07-23 devnull * Out.attr_valid and out.attr_valid_nsec give
422 5551e51d 2006-07-23 devnull * the amount of time that the attributes can
423 5551e51d 2006-07-23 devnull * be cached.
425 5551e51d 2006-07-23 devnull * Empirically, though, if I run ls -ld on the root
426 5551e51d 2006-07-23 devnull * twice back to back, I still get two getattrs,
427 5551e51d 2006-07-23 devnull * even with a one second attribute timeout!
430 5551e51d 2006-07-23 devnull fusegetattr(FuseMsg *m)
432 5551e51d 2006-07-23 devnull CFid *fid;
433 5551e51d 2006-07-23 devnull struct fuse_attr_out out;
436 5551e51d 2006-07-23 devnull if((fid = nodeid2fid(m->hdr->nodeid)) == nil){
437 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
440 5551e51d 2006-07-23 devnull if((d = fsdirfstat(fid)) == nil){
441 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
444 5551e51d 2006-07-23 devnull memset(&out, 0, sizeof out);
445 5551e51d 2006-07-23 devnull dir2attrout(d, &out);
446 5551e51d 2006-07-23 devnull free(d);
447 5551e51d 2006-07-23 devnull replyfuse(m, &out, sizeof out);
451 5551e51d 2006-07-23 devnull * Setattr.
452 5551e51d 2006-07-23 devnull * FUSE treats the many Unix attribute setting routines
453 5551e51d 2006-07-23 devnull * more or less like 9P does, with a single message.
456 5551e51d 2006-07-23 devnull fusesetattr(FuseMsg *m)
458 5551e51d 2006-07-23 devnull CFid *fid, *nfid;
459 5551e51d 2006-07-23 devnull Dir d, *dd;
460 5551e51d 2006-07-23 devnull struct fuse_setattr_in *in;
461 5551e51d 2006-07-23 devnull struct fuse_attr_out out;
463 5551e51d 2006-07-23 devnull in = m->tx;
464 5551e51d 2006-07-23 devnull if(in->valid&FATTR_FH){
465 5551e51d 2006-07-23 devnull if((fid = fh2fid(in->fh)) == nil){
466 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
470 5551e51d 2006-07-23 devnull if((fid = nodeid2fid(m->hdr->nodeid)) == nil){
471 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
475 5551e51d 2006-07-23 devnull * Special case: Linux issues a size change to
476 5551e51d 2006-07-23 devnull * truncate a file before opening it OTRUNC.
477 5551e51d 2006-07-23 devnull * Synthetic file servers (e.g., plumber) honor
478 5551e51d 2006-07-23 devnull * open(OTRUNC) but not wstat.
480 5551e51d 2006-07-23 devnull if(in->valid == FATTR_SIZE && in->size == 0){
481 5551e51d 2006-07-23 devnull if((nfid = fswalk(fid, nil)) == nil){
482 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
485 5551e51d 2006-07-23 devnull if(fsfopen(nfid, OWRITE|OTRUNC) < 0){
486 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
487 5551e51d 2006-07-23 devnull fsclose(nfid);
490 5551e51d 2006-07-23 devnull fsclose(nfid);
491 5551e51d 2006-07-23 devnull goto stat;
495 5551e51d 2006-07-23 devnull nulldir(&d);
496 5551e51d 2006-07-23 devnull if(in->valid&FATTR_SIZE)
497 5551e51d 2006-07-23 devnull d.length = in->size;
498 5551e51d 2006-07-23 devnull if(in->valid&FATTR_ATIME)
499 5551e51d 2006-07-23 devnull d.atime = in->atime;
500 5551e51d 2006-07-23 devnull if(in->valid&FATTR_MTIME)
501 5551e51d 2006-07-23 devnull d.mtime = in->mtime;
502 5551e51d 2006-07-23 devnull if(in->valid&FATTR_MODE)
503 5551e51d 2006-07-23 devnull d.mode = in->mode;
504 5551e51d 2006-07-23 devnull if((in->valid&FATTR_UID) || (in->valid&FATTR_GID)){
506 5551e51d 2006-07-23 devnull * I can't be bothered with these yet.
508 5551e51d 2006-07-23 devnull replyfuseerrno(m, EPERM);
511 5551e51d 2006-07-23 devnull if(fsdirfwstat(fid, &d) < 0){
512 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
516 5551e51d 2006-07-23 devnull if((dd = fsdirfstat(fid)) == nil){
517 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
520 5551e51d 2006-07-23 devnull memset(&out, 0, sizeof out);
521 5551e51d 2006-07-23 devnull dir2attrout(dd, &out);
522 5551e51d 2006-07-23 devnull free(dd);
523 5551e51d 2006-07-23 devnull replyfuse(m, &out, sizeof out);
527 5551e51d 2006-07-23 devnull _fuseopenfid(uvlong nodeid, int isdir, int openmode, int *err)
529 5551e51d 2006-07-23 devnull CFid *fid, *newfid;
531 5551e51d 2006-07-23 devnull if((fid = nodeid2fid(nodeid)) == nil){
532 5551e51d 2006-07-23 devnull *err = ESTALE;
533 5551e51d 2006-07-23 devnull return nil;
535 5551e51d 2006-07-23 devnull if(isdir && !(fsqid(fid).type&QTDIR)){
536 5551e51d 2006-07-23 devnull *err = ENOTDIR;
537 5551e51d 2006-07-23 devnull return nil;
539 5551e51d 2006-07-23 devnull if(openmode != OREAD && fsqid(fid).type&QTDIR){
540 5551e51d 2006-07-23 devnull *err = EISDIR;
541 5551e51d 2006-07-23 devnull return nil;
544 5551e51d 2006-07-23 devnull /* Clone fid to get one we can open. */
545 5551e51d 2006-07-23 devnull newfid = fswalk(fid, nil);
546 5551e51d 2006-07-23 devnull if(newfid == nil){
547 5551e51d 2006-07-23 devnull *err = errstr2errno();
548 5551e51d 2006-07-23 devnull return nil;
551 5551e51d 2006-07-23 devnull if(fsfopen(newfid, openmode) < 0){
552 5551e51d 2006-07-23 devnull *err = errstr2errno();
553 5551e51d 2006-07-23 devnull fsclose(newfid);
554 5551e51d 2006-07-23 devnull return nil;
557 5551e51d 2006-07-23 devnull return newfid;
561 5551e51d 2006-07-23 devnull * Open & Opendir.
562 5551e51d 2006-07-23 devnull * Argument is a struct fuse_open_in.
563 5551e51d 2006-07-23 devnull * The mode field is ignored (presumably permission bits)
564 5551e51d 2006-07-23 devnull * and flags is the open mode.
565 5551e51d 2006-07-23 devnull * Replies with a struct fuse_open_out.
568 5551e51d 2006-07-23 devnull _fuseopen(FuseMsg *m, int isdir)
570 5551e51d 2006-07-23 devnull struct fuse_open_in *in;
571 5551e51d 2006-07-23 devnull struct fuse_open_out out;
572 5551e51d 2006-07-23 devnull CFid *fid;
573 5551e51d 2006-07-23 devnull int openmode, flags, err;
575 5551e51d 2006-07-23 devnull in = m->tx;
576 5551e51d 2006-07-23 devnull flags = in->flags;
577 5551e51d 2006-07-23 devnull openmode = flags&3;
578 5551e51d 2006-07-23 devnull flags &= ~3;
579 83ab7d88 2007-11-27 rsc flags &= ~(O_DIRECTORY|O_NONBLOCK|O_LARGEFILE|O_CLOEXEC);
580 281ca361 2011-10-05 rsc #ifdef O_NOFOLLOW
581 f9c8cdb5 2011-10-07 rsc flags &= ~O_NOFOLLOW;
583 281ca361 2011-10-05 rsc #ifdef O_LARGEFILE
584 f9c8cdb5 2011-10-07 rsc flags &= ~O_LARGEFILE;
588 e465991e 2008-12-30 rsc * Discarding O_APPEND here is not completely wrong,
589 e465991e 2008-12-30 rsc * because the host kernel will rewrite the offsets
590 e465991e 2008-12-30 rsc * of write system calls for us. That's the best we
591 e465991e 2008-12-30 rsc * can do on Unix anyway.
593 e465991e 2008-12-30 rsc flags &= ~O_APPEND;
594 0d7fd011 2006-07-23 devnull if(flags & O_TRUNC){
595 0d7fd011 2006-07-23 devnull openmode |= OTRUNC;
596 0d7fd011 2006-07-23 devnull flags &= ~O_TRUNC;
599 0d7fd011 2006-07-23 devnull * Could translate but not standard 9P:
600 0d7fd011 2006-07-23 devnull * O_DIRECT -> ODIRECT
601 0d7fd011 2006-07-23 devnull * O_NONBLOCK -> ONONBLOCK
603 5551e51d 2006-07-23 devnull if(flags){
604 281ca361 2011-10-05 rsc fprint(2, "unexpected open flags %#uo\n", (uint)in->flags);
605 5551e51d 2006-07-23 devnull replyfuseerrno(m, EACCES);
608 5551e51d 2006-07-23 devnull if((fid = _fuseopenfid(m->hdr->nodeid, isdir, openmode, &err)) == nil){
609 5551e51d 2006-07-23 devnull replyfuseerrno(m, err);
612 5551e51d 2006-07-23 devnull out.fh = allocfh(fid);
613 5551e51d 2006-07-23 devnull out.open_flags = FOPEN_DIRECT_IO; /* no page cache */
614 5551e51d 2006-07-23 devnull replyfuse(m, &out, sizeof out);
618 5551e51d 2006-07-23 devnull fuseopen(FuseMsg *m)
620 5551e51d 2006-07-23 devnull _fuseopen(m, 0);
624 5551e51d 2006-07-23 devnull fuseopendir(FuseMsg *m)
626 5551e51d 2006-07-23 devnull _fuseopen(m, 1);
630 5551e51d 2006-07-23 devnull * Create & Mkdir.
633 5551e51d 2006-07-23 devnull _fusecreate(uvlong nodeid, char *name, int perm, int ismkdir, int omode, struct fuse_entry_out *out, int *err)
635 5551e51d 2006-07-23 devnull CFid *fid, *newfid, *newfid2;
637 5551e51d 2006-07-23 devnull Fusefid *ff;
639 5551e51d 2006-07-23 devnull if((fid = nodeid2fid(nodeid)) == nil){
640 5551e51d 2006-07-23 devnull *err = ESTALE;
641 5551e51d 2006-07-23 devnull return nil;
643 5551e51d 2006-07-23 devnull perm &= 0777;
644 5551e51d 2006-07-23 devnull if(ismkdir)
645 5551e51d 2006-07-23 devnull perm |= DMDIR;
646 5551e51d 2006-07-23 devnull if(ismkdir && omode != OREAD){
647 5551e51d 2006-07-23 devnull *err = EPERM;
648 5551e51d 2006-07-23 devnull return nil;
650 5551e51d 2006-07-23 devnull if((newfid = fswalk(fid, nil)) == nil){
651 5551e51d 2006-07-23 devnull *err = errstr2errno();
652 5551e51d 2006-07-23 devnull return nil;
654 e54f9a4a 2007-05-09 devnull if(fsfcreate(newfid, name, omode, perm) < 0){
655 5551e51d 2006-07-23 devnull *err = errstr2errno();
656 5551e51d 2006-07-23 devnull fsclose(newfid);
657 5551e51d 2006-07-23 devnull return nil;
659 5551e51d 2006-07-23 devnull if((d = fsdirfstat(newfid)) == nil){
660 5551e51d 2006-07-23 devnull *err = errstr2errno();
661 5551e51d 2006-07-23 devnull fsfremove(newfid);
662 5551e51d 2006-07-23 devnull return nil;
665 5551e51d 2006-07-23 devnull * This fid is no good, because it's open.
666 5551e51d 2006-07-23 devnull * We need an unopened fid. Sigh.
668 5551e51d 2006-07-23 devnull if((newfid2 = fswalk(fid, name)) == nil){
669 5551e51d 2006-07-23 devnull *err = errstr2errno();
670 5551e51d 2006-07-23 devnull free(d);
671 5551e51d 2006-07-23 devnull fsfremove(newfid);
672 5551e51d 2006-07-23 devnull return nil;
674 5551e51d 2006-07-23 devnull out->nodeid = allocnodeid(newfid2);
675 5551e51d 2006-07-23 devnull ff = lookupfusefid(out->nodeid, 1);
676 5551e51d 2006-07-23 devnull out->generation = ff->gen;
677 5551e51d 2006-07-23 devnull f2timeout(attrtimeout, &out->attr_valid, &out->attr_valid_nsec);
678 5551e51d 2006-07-23 devnull f2timeout(entrytimeout, &out->entry_valid, &out->entry_valid_nsec);
679 5551e51d 2006-07-23 devnull dir2attr(d, &out->attr);
680 5551e51d 2006-07-23 devnull free(d);
681 5551e51d 2006-07-23 devnull return newfid;
685 5551e51d 2006-07-23 devnull fusemkdir(FuseMsg *m)
687 5551e51d 2006-07-23 devnull struct fuse_mkdir_in *in;
688 5551e51d 2006-07-23 devnull struct fuse_entry_out out;
689 5551e51d 2006-07-23 devnull CFid *fid;
690 5551e51d 2006-07-23 devnull int err;
691 5551e51d 2006-07-23 devnull char *name;
693 5551e51d 2006-07-23 devnull in = m->tx;
694 5551e51d 2006-07-23 devnull name = (char*)(in+1);
695 5551e51d 2006-07-23 devnull if((fid = _fusecreate(m->hdr->nodeid, name, in->mode, 1, OREAD, &out, &err)) == nil){
696 5551e51d 2006-07-23 devnull replyfuseerrno(m, err);
699 5551e51d 2006-07-23 devnull /* Toss the open fid. */
700 5551e51d 2006-07-23 devnull fsclose(fid);
701 5551e51d 2006-07-23 devnull replyfuse(m, &out, sizeof out);
705 5551e51d 2006-07-23 devnull fusecreate(FuseMsg *m)
707 5551e51d 2006-07-23 devnull struct fuse_open_in *in;
708 5551e51d 2006-07-23 devnull struct fuse_create_out out;
709 5551e51d 2006-07-23 devnull CFid *fid;
710 5551e51d 2006-07-23 devnull int err, openmode, flags;
711 5551e51d 2006-07-23 devnull char *name;
713 5551e51d 2006-07-23 devnull in = m->tx;
714 5551e51d 2006-07-23 devnull flags = in->flags;
715 5551e51d 2006-07-23 devnull openmode = in->flags&3;
716 d7158243 2007-05-09 devnull flags &= ~3;
717 e10a8342 2009-04-30 rsc flags &= ~(O_DIRECTORY|O_NONBLOCK|O_LARGEFILE|O_EXCL);
718 e465991e 2008-12-30 rsc flags &= ~O_APPEND; /* see comment in _fuseopen */
719 d7158243 2007-05-09 devnull flags &= ~(O_CREAT|O_TRUNC); /* huh? */
720 5551e51d 2006-07-23 devnull if(flags){
721 5551e51d 2006-07-23 devnull fprint(2, "bad mode %#uo\n", in->flags);
722 5551e51d 2006-07-23 devnull replyfuseerrno(m, EACCES);
725 5551e51d 2006-07-23 devnull name = (char*)(in+1);
726 5551e51d 2006-07-23 devnull if((fid = _fusecreate(m->hdr->nodeid, name, in->mode, 0, openmode, &out.e, &err)) == nil){
727 5551e51d 2006-07-23 devnull replyfuseerrno(m, err);
730 5551e51d 2006-07-23 devnull out.o.fh = allocfh(fid);
731 5551e51d 2006-07-23 devnull out.o.open_flags = FOPEN_DIRECT_IO; /* no page cache */
732 5551e51d 2006-07-23 devnull replyfuse(m, &out, sizeof out);
736 5551e51d 2006-07-23 devnull * Access.
737 5551e51d 2006-07-23 devnull * Lib9pclient implements this just as Plan 9 does,
738 5551e51d 2006-07-23 devnull * by opening the file (or not) and then closing it.
741 5551e51d 2006-07-23 devnull fuseaccess(FuseMsg *m)
743 5551e51d 2006-07-23 devnull struct fuse_access_in *in;
744 5551e51d 2006-07-23 devnull CFid *fid;
745 143cdf57 2006-07-26 devnull int err, omode;
746 5551e51d 2006-07-23 devnull static int a2o[] = {
757 5551e51d 2006-07-23 devnull in = m->tx;
758 5551e51d 2006-07-23 devnull if(in->mask >= nelem(a2o)){
759 5551e51d 2006-07-23 devnull replyfuseerrno(m, EINVAL);
762 143cdf57 2006-07-26 devnull omode = a2o[in->mask];
763 143cdf57 2006-07-26 devnull if((fid = nodeid2fid(m->hdr->nodeid)) == nil){
764 143cdf57 2006-07-26 devnull replyfuseerrno(m, ESTALE);
767 143cdf57 2006-07-26 devnull if(fsqid(fid).type&QTDIR)
768 143cdf57 2006-07-26 devnull omode = OREAD;
769 143cdf57 2006-07-26 devnull if((fid = _fuseopenfid(m->hdr->nodeid, 0, omode, &err)) == nil){
770 5551e51d 2006-07-23 devnull replyfuseerrno(m, err);
773 5551e51d 2006-07-23 devnull fsclose(fid);
774 5551e51d 2006-07-23 devnull replyfuse(m, nil, 0);
778 5551e51d 2006-07-23 devnull * Release.
779 5551e51d 2006-07-23 devnull * Equivalent of clunk for file handles.
780 5551e51d 2006-07-23 devnull * in->flags is the open mode used in Open or Opendir.
783 5551e51d 2006-07-23 devnull fuserelease(FuseMsg *m)
785 5551e51d 2006-07-23 devnull struct fuse_release_in *in;
786 5551e51d 2006-07-23 devnull Fusefid *ff;
788 5551e51d 2006-07-23 devnull in = m->tx;
789 5551e51d 2006-07-23 devnull if((ff = lookupfusefid(in->fh, 0)) != nil)
790 5551e51d 2006-07-23 devnull freefusefid(ff);
792 5551e51d 2006-07-23 devnull fprint(2, "fuserelease: fh not found\n");
793 5551e51d 2006-07-23 devnull replyfuse(m, nil, 0);
797 5551e51d 2006-07-23 devnull fusereleasedir(FuseMsg *m)
799 5551e51d 2006-07-23 devnull fuserelease(m);
804 5551e51d 2006-07-23 devnull * Read from file handle in->fh at offset in->offset for size in->size.
805 5551e51d 2006-07-23 devnull * We truncate size to maxwrite just to keep the buffer reasonable.
808 5551e51d 2006-07-23 devnull fuseread(FuseMsg *m)
811 5551e51d 2006-07-23 devnull uchar *buf;
812 5551e51d 2006-07-23 devnull CFid *fid;
813 5551e51d 2006-07-23 devnull struct fuse_read_in *in;
815 5551e51d 2006-07-23 devnull in = m->tx;
816 5551e51d 2006-07-23 devnull if((fid = fh2fid(in->fh)) == nil){
817 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
820 5551e51d 2006-07-23 devnull n = in->size;
821 5551e51d 2006-07-23 devnull if(n > fusemaxwrite)
822 5551e51d 2006-07-23 devnull n = fusemaxwrite;
823 5551e51d 2006-07-23 devnull buf = emalloc(n);
824 cd2bb6ce 2007-05-04 devnull n = fspread(fid, buf, n, in->offset);
825 5551e51d 2006-07-23 devnull if(n < 0){
826 5551e51d 2006-07-23 devnull free(buf);
827 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
830 5551e51d 2006-07-23 devnull replyfuse(m, buf, n);
831 5551e51d 2006-07-23 devnull free(buf);
838 d07db89b 2008-07-04 rsc fusereadlink(FuseMsg *m)
843 d07db89b 2008-07-04 rsc if((fid = nodeid2fid(m->hdr->nodeid)) == nil){
844 d07db89b 2008-07-04 rsc replyfuseerrno(m, ESTALE);
847 d07db89b 2008-07-04 rsc if((d = fsdirfstat(fid)) == nil){
848 d07db89b 2008-07-04 rsc replyfuseerrstr(m);
851 d07db89b 2008-07-04 rsc if(!(d->mode&DMSYMLINK)){
852 d07db89b 2008-07-04 rsc replyfuseerrno(m, EINVAL);
855 d07db89b 2008-07-04 rsc replyfuse(m, d->ext, strlen(d->ext));
861 5551e51d 2006-07-23 devnull * Readdir.
862 5551e51d 2006-07-23 devnull * Read from file handle in->fh at offset in->offset for size in->size.
863 5551e51d 2006-07-23 devnull * We truncate size to maxwrite just to keep the buffer reasonable.
864 5551e51d 2006-07-23 devnull * We assume 9P directory read semantics: a read at offset 0 rewinds
865 5551e51d 2006-07-23 devnull * and a read at any other offset starts where we left off.
866 5551e51d 2006-07-23 devnull * If it became necessary, we could implement a crude seek
867 5551e51d 2006-07-23 devnull * or cache the entire list of directory entries.
868 5551e51d 2006-07-23 devnull * Directory entries read from 9P but not yet handed to FUSE
869 5551e51d 2006-07-23 devnull * are stored in m->d,nd,d0.
871 5551e51d 2006-07-23 devnull int canpack(Dir*, uvlong, uchar**, uchar*);
872 9ec57f8b 2008-07-04 rsc Dir *dotdirs(CFid*);
874 5551e51d 2006-07-23 devnull fusereaddir(FuseMsg *m)
876 5551e51d 2006-07-23 devnull struct fuse_read_in *in;
877 5551e51d 2006-07-23 devnull uchar *buf, *p, *ep;
879 5551e51d 2006-07-23 devnull Fusefid *ff;
881 5551e51d 2006-07-23 devnull in = m->tx;
882 5551e51d 2006-07-23 devnull if((ff = lookupfusefid(in->fh, 0)) == nil){
883 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
886 5551e51d 2006-07-23 devnull if(in->offset == 0){
887 5551e51d 2006-07-23 devnull fsseek(ff->fid, 0, 0);
888 5551e51d 2006-07-23 devnull free(ff->d0);
889 9ec57f8b 2008-07-04 rsc ff->d0 = ff->d = dotdirs(ff->fid);
892 5551e51d 2006-07-23 devnull n = in->size;
893 5551e51d 2006-07-23 devnull if(n > fusemaxwrite)
894 5551e51d 2006-07-23 devnull n = fusemaxwrite;
895 5551e51d 2006-07-23 devnull buf = emalloc(n);
896 5551e51d 2006-07-23 devnull p = buf;
897 5551e51d 2006-07-23 devnull ep = buf + n;
898 5551e51d 2006-07-23 devnull for(;;){
899 ca6a2d95 2006-08-01 devnull while(ff->nd > 0){
900 ca6a2d95 2006-08-01 devnull if(!canpack(ff->d, ff->off, &p, ep))
901 ca6a2d95 2006-08-01 devnull goto out;
902 5551e51d 2006-07-23 devnull ff->off++;
903 5551e51d 2006-07-23 devnull ff->d++;
904 5551e51d 2006-07-23 devnull ff->nd--;
906 ca6a2d95 2006-08-01 devnull free(ff->d0);
907 ca6a2d95 2006-08-01 devnull ff->d0 = nil;
908 ca6a2d95 2006-08-01 devnull ff->d = nil;
909 ca6a2d95 2006-08-01 devnull if((ff->nd = fsdirread(ff->fid, &ff->d0)) < 0){
910 ca6a2d95 2006-08-01 devnull replyfuseerrstr(m);
911 ca6a2d95 2006-08-01 devnull free(buf);
914 ca6a2d95 2006-08-01 devnull if(ff->nd == 0)
916 ca6a2d95 2006-08-01 devnull ff->d = ff->d0;
919 5551e51d 2006-07-23 devnull replyfuse(m, buf, p - buf);
920 5551e51d 2006-07-23 devnull free(buf);
924 9ec57f8b 2008-07-04 rsc * Fuse assumes that it can always read two directory entries.
925 9ec57f8b 2008-07-04 rsc * If it gets just one, it will double it in the dirread results.
926 9ec57f8b 2008-07-04 rsc * Thus if a directory contains just "a", you see "a" twice.
927 9ec57f8b 2008-07-04 rsc * Adding . as the first directory entry works around this.
928 9ec57f8b 2008-07-04 rsc * We could add .. too, but it isn't necessary.
931 9ec57f8b 2008-07-04 rsc dotdirs(CFid *f)
936 9ec57f8b 2008-07-04 rsc d = emalloc(2*sizeof *d);
937 9ec57f8b 2008-07-04 rsc d[0].name = ".";
938 9ec57f8b 2008-07-04 rsc d[0].qid = fsqid(f);
939 9ec57f8b 2008-07-04 rsc d[1].name = "..";
940 9ec57f8b 2008-07-04 rsc f1 = fswalk(f, "..");
942 9ec57f8b 2008-07-04 rsc d[1].qid = fsqid(f1);
943 9ec57f8b 2008-07-04 rsc fsclose(f1);
949 5551e51d 2006-07-23 devnull canpack(Dir *d, uvlong off, uchar **pp, uchar *ep)
951 5551e51d 2006-07-23 devnull uchar *p;
952 5551e51d 2006-07-23 devnull struct fuse_dirent *de;
953 5551e51d 2006-07-23 devnull int pad, size;
955 5551e51d 2006-07-23 devnull p = *pp;
956 5551e51d 2006-07-23 devnull size = FUSE_NAME_OFFSET + strlen(d->name);
957 5551e51d 2006-07-23 devnull pad = 0;
958 5551e51d 2006-07-23 devnull if(size%8)
959 5551e51d 2006-07-23 devnull pad = 8 - size%8;
960 5551e51d 2006-07-23 devnull if(size+pad > ep - p)
961 5551e51d 2006-07-23 devnull return 0;
962 5551e51d 2006-07-23 devnull de = (struct fuse_dirent*)p;
963 5551e51d 2006-07-23 devnull de->ino = qid2inode(d->qid);
964 5551e51d 2006-07-23 devnull de->off = off;
965 5551e51d 2006-07-23 devnull de->namelen = strlen(d->name);
966 5551e51d 2006-07-23 devnull memmove(de->name, d->name, de->namelen);
967 5551e51d 2006-07-23 devnull if(pad > 0)
968 5551e51d 2006-07-23 devnull memset(de->name+de->namelen, 0, pad);
969 5551e51d 2006-07-23 devnull *pp = p+size+pad;
970 5551e51d 2006-07-23 devnull return 1;
974 5551e51d 2006-07-23 devnull * Write.
975 5551e51d 2006-07-23 devnull * Write from file handle in->fh at offset in->offset for size in->size.
976 5551e51d 2006-07-23 devnull * Don't know what in->write_flags means.
978 5551e51d 2006-07-23 devnull * Apparently implementations are allowed to buffer these writes
979 5551e51d 2006-07-23 devnull * and wait until Flush is sent, but FUSE docs say flush may be
980 5551e51d 2006-07-23 devnull * called zero, one, or even more times per close. So better do the
981 5551e51d 2006-07-23 devnull * actual writing here. Also, errors that happen during Flush just
982 5551e51d 2006-07-23 devnull * show up in the close() return status, which no one checks anyway.
985 5551e51d 2006-07-23 devnull fusewrite(FuseMsg *m)
987 5551e51d 2006-07-23 devnull struct fuse_write_in *in;
988 5551e51d 2006-07-23 devnull struct fuse_write_out out;
989 5551e51d 2006-07-23 devnull void *a;
990 5551e51d 2006-07-23 devnull CFid *fid;
993 5551e51d 2006-07-23 devnull in = m->tx;
994 5551e51d 2006-07-23 devnull a = in+1;
995 5551e51d 2006-07-23 devnull if((fid = fh2fid(in->fh)) == nil){
996 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
999 5551e51d 2006-07-23 devnull if(in->size > fusemaxwrite){
1000 5551e51d 2006-07-23 devnull replyfuseerrno(m, EINVAL);
1001 5551e51d 2006-07-23 devnull return;
1003 cd2bb6ce 2007-05-04 devnull n = fspwrite(fid, a, in->size, in->offset);
1004 5551e51d 2006-07-23 devnull if(n < 0){
1005 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
1006 5551e51d 2006-07-23 devnull return;
1008 5551e51d 2006-07-23 devnull out.size = n;
1009 5551e51d 2006-07-23 devnull replyfuse(m, &out, sizeof out);
1013 5551e51d 2006-07-23 devnull * Flush. Supposed to flush any buffered writes. Don't use this.
1015 5551e51d 2006-07-23 devnull * Flush is a total crock. It gets called on close() of a file descriptor
1016 5551e51d 2006-07-23 devnull * associated with this open file. Some open files have multiple file
1017 5551e51d 2006-07-23 devnull * descriptors and thus multiple closes of those file descriptors.
1018 5551e51d 2006-07-23 devnull * In those cases, Flush is called multiple times. Some open files
1019 5551e51d 2006-07-23 devnull * have file descriptors that are closed on process exit instead of
1020 5551e51d 2006-07-23 devnull * closed explicitly. For those files, Flush is never called.
1021 5551e51d 2006-07-23 devnull * Even more amusing, Flush gets called before close() of read-only
1022 5551e51d 2006-07-23 devnull * file descriptors too!
1024 5551e51d 2006-07-23 devnull * This is just a bad idea.
1027 5551e51d 2006-07-23 devnull fuseflush(FuseMsg *m)
1029 5551e51d 2006-07-23 devnull replyfuse(m, nil, 0);
1033 5551e51d 2006-07-23 devnull * Unlink & Rmdir.
1036 5551e51d 2006-07-23 devnull _fuseremove(FuseMsg *m, int isdir)
1038 5551e51d 2006-07-23 devnull char *name;
1039 5551e51d 2006-07-23 devnull CFid *fid, *newfid;
1041 5551e51d 2006-07-23 devnull name = m->tx;
1042 5551e51d 2006-07-23 devnull if((fid = nodeid2fid(m->hdr->nodeid)) == nil){
1043 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
1044 5551e51d 2006-07-23 devnull return;
1046 5551e51d 2006-07-23 devnull if(strchr(name, '/')){
1047 5551e51d 2006-07-23 devnull replyfuseerrno(m, ENOENT);
1048 5551e51d 2006-07-23 devnull return;
1050 5551e51d 2006-07-23 devnull if((newfid = fswalk(fid, name)) == nil){
1051 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
1052 5551e51d 2006-07-23 devnull return;
1054 5551e51d 2006-07-23 devnull if(isdir && !(fsqid(newfid).type&QTDIR)){
1055 5551e51d 2006-07-23 devnull replyfuseerrno(m, ENOTDIR);
1056 5551e51d 2006-07-23 devnull fsclose(newfid);
1057 5551e51d 2006-07-23 devnull return;
1059 5551e51d 2006-07-23 devnull if(!isdir && (fsqid(newfid).type&QTDIR)){
1060 5551e51d 2006-07-23 devnull replyfuseerrno(m, EISDIR);
1061 5551e51d 2006-07-23 devnull fsclose(newfid);
1062 5551e51d 2006-07-23 devnull return;
1064 5551e51d 2006-07-23 devnull if(fsfremove(newfid) < 0){
1065 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
1066 5551e51d 2006-07-23 devnull return;
1068 5551e51d 2006-07-23 devnull replyfuse(m, nil, 0);
1072 5551e51d 2006-07-23 devnull fuseunlink(FuseMsg *m)
1074 5551e51d 2006-07-23 devnull _fuseremove(m, 0);
1078 5551e51d 2006-07-23 devnull fusermdir(FuseMsg *m)
1080 5551e51d 2006-07-23 devnull _fuseremove(m, 1);
1084 5551e51d 2006-07-23 devnull * Rename.
1086 5551e51d 2006-07-23 devnull * FUSE sends the nodeid for the source and destination
1087 5551e51d 2006-07-23 devnull * directory and then the before and after names as strings.
1088 5551e51d 2006-07-23 devnull * 9P can only do the rename if the source and destination
1089 5551e51d 2006-07-23 devnull * are the same. If the same nodeid is used for source and
1090 5551e51d 2006-07-23 devnull * destination, we're fine, but if FUSE gives us different nodeids
1091 5551e51d 2006-07-23 devnull * that happen to correspond to the same directory, we have
1092 5551e51d 2006-07-23 devnull * no way of figuring that out. Let's hope it doesn't happen too often.
1095 5551e51d 2006-07-23 devnull fuserename(FuseMsg *m)
1097 5551e51d 2006-07-23 devnull struct fuse_rename_in *in;
1098 5551e51d 2006-07-23 devnull char *before, *after;
1099 5551e51d 2006-07-23 devnull CFid *fid, *newfid;
1102 5551e51d 2006-07-23 devnull in = m->tx;
1103 5551e51d 2006-07-23 devnull if(in->newdir != m->hdr->nodeid){
1104 5551e51d 2006-07-23 devnull replyfuseerrno(m, EXDEV);
1105 5551e51d 2006-07-23 devnull return;
1107 5551e51d 2006-07-23 devnull before = (char*)(in+1);
1108 5551e51d 2006-07-23 devnull after = before + strlen(before) + 1;
1109 5551e51d 2006-07-23 devnull if((fid = nodeid2fid(m->hdr->nodeid)) == nil){
1110 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
1111 5551e51d 2006-07-23 devnull return;
1113 5551e51d 2006-07-23 devnull if(strchr(before, '/') || strchr(after, '/')){
1114 5551e51d 2006-07-23 devnull replyfuseerrno(m, ENOENT);
1115 5551e51d 2006-07-23 devnull return;
1117 5551e51d 2006-07-23 devnull if((newfid = fswalk(fid, before)) == nil){
1118 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
1119 5551e51d 2006-07-23 devnull return;
1121 5551e51d 2006-07-23 devnull nulldir(&d);
1122 5551e51d 2006-07-23 devnull d.name = after;
1123 5551e51d 2006-07-23 devnull if(fsdirfwstat(newfid, &d) < 0){
1124 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
1125 5551e51d 2006-07-23 devnull fsclose(newfid);
1126 5551e51d 2006-07-23 devnull return;
1128 5551e51d 2006-07-23 devnull fsclose(newfid);
1129 5551e51d 2006-07-23 devnull replyfuse(m, nil, 0);
1133 5551e51d 2006-07-23 devnull * Fsync. Commit file info to stable storage.
1134 5551e51d 2006-07-23 devnull * Not sure what in->fsync_flags are.
1137 5551e51d 2006-07-23 devnull fusefsync(FuseMsg *m)
1139 5551e51d 2006-07-23 devnull struct fuse_fsync_in *in;
1140 5551e51d 2006-07-23 devnull CFid *fid;
1143 5551e51d 2006-07-23 devnull in = m->tx;
1144 5551e51d 2006-07-23 devnull if((fid = fh2fid(in->fh)) == nil){
1145 5551e51d 2006-07-23 devnull replyfuseerrno(m, ESTALE);
1146 5551e51d 2006-07-23 devnull return;
1148 5551e51d 2006-07-23 devnull nulldir(&d);
1149 5551e51d 2006-07-23 devnull if(fsdirfwstat(fid, &d) < 0){
1150 5551e51d 2006-07-23 devnull replyfuseerrstr(m);
1151 5551e51d 2006-07-23 devnull return;
1153 5551e51d 2006-07-23 devnull replyfuse(m, nil, 0);
1157 5551e51d 2006-07-23 devnull * Fsyncdir. Commit dir info to stable storage?
1160 5551e51d 2006-07-23 devnull fusefsyncdir(FuseMsg *m)
1162 5551e51d 2006-07-23 devnull fusefsync(m);
1166 5551e51d 2006-07-23 devnull * Statfs. Send back information about file system.
1167 5551e51d 2006-07-23 devnull * Not really worth implementing, except that if we
1168 5551e51d 2006-07-23 devnull * reply with ENOSYS, programs like df print messages like
1169 5551e51d 2006-07-23 devnull * df: `/tmp/z': Function not implemented
1170 5551e51d 2006-07-23 devnull * and that gets annoying. Returning all zeros excludes
1171 5551e51d 2006-07-23 devnull * us from df without appearing to cause any problems.
1174 5551e51d 2006-07-23 devnull fusestatfs(FuseMsg *m)
1176 5551e51d 2006-07-23 devnull struct fuse_statfs_out out;
1178 5551e51d 2006-07-23 devnull memset(&out, 0, sizeof out);
1179 5551e51d 2006-07-23 devnull replyfuse(m, &out, sizeof out);
1182 5551e51d 2006-07-23 devnull void (*fusehandlers[100])(FuseMsg*);
1184 5551e51d 2006-07-23 devnull struct {
1185 5551e51d 2006-07-23 devnull int op;
1186 5551e51d 2006-07-23 devnull void (*fn)(FuseMsg*);
1187 5551e51d 2006-07-23 devnull } fuselist[] = {
1188 5551e51d 2006-07-23 devnull { FUSE_LOOKUP, fuselookup },
1189 5551e51d 2006-07-23 devnull { FUSE_FORGET, fuseforget },
1190 5551e51d 2006-07-23 devnull { FUSE_GETATTR, fusegetattr },
1191 5551e51d 2006-07-23 devnull { FUSE_SETATTR, fusesetattr },
1193 d07db89b 2008-07-04 rsc * FUSE_SYMLINK, FUSE_MKNOD are unimplemented.
1195 d07db89b 2008-07-04 rsc { FUSE_READLINK, fusereadlink },
1196 5551e51d 2006-07-23 devnull { FUSE_MKDIR, fusemkdir },
1197 5551e51d 2006-07-23 devnull { FUSE_UNLINK, fuseunlink },
1198 5551e51d 2006-07-23 devnull { FUSE_RMDIR, fusermdir },
1199 5551e51d 2006-07-23 devnull { FUSE_RENAME, fuserename },
1201 5551e51d 2006-07-23 devnull * FUSE_LINK is unimplemented.
1203 5551e51d 2006-07-23 devnull { FUSE_OPEN, fuseopen },
1204 5551e51d 2006-07-23 devnull { FUSE_READ, fuseread },
1205 5551e51d 2006-07-23 devnull { FUSE_WRITE, fusewrite },
1206 5551e51d 2006-07-23 devnull { FUSE_STATFS, fusestatfs },
1207 5551e51d 2006-07-23 devnull { FUSE_RELEASE, fuserelease },
1208 5551e51d 2006-07-23 devnull { FUSE_FSYNC, fusefsync },
1210 5551e51d 2006-07-23 devnull * FUSE_SETXATTR, FUSE_GETXATTR, FUSE_LISTXATTR, and
1211 5551e51d 2006-07-23 devnull * FUSE_REMOVEXATTR are unimplemented.
1212 5551e51d 2006-07-23 devnull * FUSE will stop sending these requests after getting
1213 5551e51d 2006-07-23 devnull * an -ENOSYS reply (see dispatch below).
1215 5551e51d 2006-07-23 devnull { FUSE_FLUSH, fuseflush },
1217 5551e51d 2006-07-23 devnull * FUSE_INIT is handled in initfuse and should not be seen again.
1219 5551e51d 2006-07-23 devnull { FUSE_OPENDIR, fuseopendir },
1220 5551e51d 2006-07-23 devnull { FUSE_READDIR, fusereaddir },
1221 5551e51d 2006-07-23 devnull { FUSE_RELEASEDIR, fusereleasedir },
1222 5551e51d 2006-07-23 devnull { FUSE_FSYNCDIR, fusefsyncdir },
1223 5551e51d 2006-07-23 devnull { FUSE_ACCESS, fuseaccess },
1224 5551e51d 2006-07-23 devnull { FUSE_CREATE, fusecreate },
1228 5551e51d 2006-07-23 devnull fusethread(void *v)
1230 5551e51d 2006-07-23 devnull FuseMsg *m;
1233 5551e51d 2006-07-23 devnull if((uint)m->hdr->opcode >= nelem(fusehandlers)
1234 5551e51d 2006-07-23 devnull || !fusehandlers[m->hdr->opcode]){
1235 5551e51d 2006-07-23 devnull replyfuseerrno(m, ENOSYS);
1236 5551e51d 2006-07-23 devnull return;
1238 5551e51d 2006-07-23 devnull fusehandlers[m->hdr->opcode](m);
1242 5551e51d 2006-07-23 devnull fusedispatch(void *v)
1245 5551e51d 2006-07-23 devnull FuseMsg *m;
1247 5551e51d 2006-07-23 devnull eofkill9pclient = 1; /* threadexitsall on 9P eof */
1248 5551e51d 2006-07-23 devnull atexit(unmountatexit);
1250 5551e51d 2006-07-23 devnull recvp(fusechan); /* sync */
1252 5551e51d 2006-07-23 devnull for(i=0; i<nelem(fuselist); i++){
1253 5551e51d 2006-07-23 devnull if(fuselist[i].op >= nelem(fusehandlers))
1254 5551e51d 2006-07-23 devnull sysfatal("make fusehandlers bigger op=%d", fuselist[i].op);
1255 5551e51d 2006-07-23 devnull fusehandlers[fuselist[i].op] = fuselist[i].fn;
1258 5551e51d 2006-07-23 devnull while((m = recvp(fusechan)) != nil)
1259 5551e51d 2006-07-23 devnull threadcreate(fusethread, m, STACK);
1263 5551e51d 2006-07-23 devnull emalloc(uint n)
1265 5551e51d 2006-07-23 devnull void *p;
1267 5551e51d 2006-07-23 devnull p = malloc(n);
1268 5551e51d 2006-07-23 devnull if(p == nil)
1269 5551e51d 2006-07-23 devnull sysfatal("malloc(%d): %r", n);
1270 5551e51d 2006-07-23 devnull memset(p, 0, n);
1271 5551e51d 2006-07-23 devnull return p;
1275 5551e51d 2006-07-23 devnull erealloc(void *p, uint n)
1277 5551e51d 2006-07-23 devnull p = realloc(p, n);
1278 5551e51d 2006-07-23 devnull if(p == nil)
1279 5551e51d 2006-07-23 devnull sysfatal("realloc(..., %d): %r", n);
1280 5551e51d 2006-07-23 devnull return p;
1284 5551e51d 2006-07-23 devnull estrdup(char *p)
1286 5551e51d 2006-07-23 devnull char *pp;
1287 5551e51d 2006-07-23 devnull pp = strdup(p);
1288 5551e51d 2006-07-23 devnull if(pp == nil)
1289 5551e51d 2006-07-23 devnull sysfatal("strdup(%.20s): %r", p);
1290 5551e51d 2006-07-23 devnull return pp;
1294 e63025d0 2008-04-17 rsc watchfd(void *v)
1296 e63025d0 2008-04-17 rsc int fd = (int)(uintptr)v;
1298 e63025d0 2008-04-17 rsc /* wait for exception (file closed) */
1299 e63025d0 2008-04-17 rsc fd_set set;
1300 e63025d0 2008-04-17 rsc FD_ZERO(&set);
1301 e63025d0 2008-04-17 rsc FD_SET(fd, &set);
1302 e63025d0 2008-04-17 rsc if(select(fd+1, NULL, NULL, &set, NULL) >= 0)
1303 e63025d0 2008-04-17 rsc threadexitsall(nil);
