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9db221ae AK |
1 | /* |
2 | * Virtio 9p synthetic file system support | |
3 | * | |
4 | * Copyright IBM, Corp. 2011 | |
5 | * | |
6 | * Authors: | |
7 | * Malahal Naineni <malahal@us.ibm.com> | |
8 | * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | |
9 | * | |
10 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
11 | * the COPYING file in the top-level directory. | |
12 | * | |
13 | */ | |
14 | ||
fbc04127 | 15 | #include "qemu/osdep.h" |
0d09e41a | 16 | #include "hw/virtio/virtio.h" |
ebe74f8b | 17 | #include "9p.h" |
267ae092 | 18 | #include "9p-xattr.h" |
9db221ae | 19 | #include "fsdev/qemu-fsdev.h" |
364031f1 | 20 | #include "9p-synth.h" |
7911747b | 21 | #include "qemu/rcu.h" |
341774fe | 22 | #include "qemu/rcu_queue.h" |
9db221ae AK |
23 | |
24 | /* Root node for synth file system */ | |
f5a014d2 | 25 | static V9fsSynthNode v9fs_synth_root = { |
9db221ae AK |
26 | .name = "/", |
27 | .actual_attr = { | |
28 | .mode = 0555 | S_IFDIR, | |
29 | .nlink = 1, | |
30 | }, | |
31 | .attr = &v9fs_synth_root.actual_attr, | |
32 | }; | |
33 | ||
2583e443 | 34 | static QemuMutex v9fs_synth_mutex; |
9db221ae AK |
35 | static int v9fs_synth_node_count; |
36 | /* set to 1 when the synth fs is ready */ | |
37 | static int v9fs_synth_fs; | |
38 | ||
39 | static V9fsSynthNode *v9fs_add_dir_node(V9fsSynthNode *parent, int mode, | |
40 | const char *name, | |
41 | V9fsSynthNodeAttr *attr, int inode) | |
42 | { | |
43 | V9fsSynthNode *node; | |
44 | ||
45 | /* Add directory type and remove write bits */ | |
46 | mode = ((mode & 0777) | S_IFDIR) & ~(S_IWUSR | S_IWGRP | S_IWOTH); | |
47 | node = g_malloc0(sizeof(V9fsSynthNode)); | |
48 | if (attr) { | |
49 | /* We are adding .. or . entries */ | |
50 | node->attr = attr; | |
51 | node->attr->nlink++; | |
52 | } else { | |
53 | node->attr = &node->actual_attr; | |
54 | node->attr->inode = inode; | |
55 | node->attr->nlink = 1; | |
56 | /* We don't allow write to directories */ | |
57 | node->attr->mode = mode; | |
58 | node->attr->write = NULL; | |
59 | node->attr->read = NULL; | |
60 | } | |
61 | node->private = node; | |
a79b5f8b | 62 | pstrcpy(node->name, sizeof(node->name), name); |
2583e443 | 63 | QLIST_INSERT_HEAD_RCU(&parent->child, node, sibling); |
9db221ae AK |
64 | return node; |
65 | } | |
66 | ||
67 | int qemu_v9fs_synth_mkdir(V9fsSynthNode *parent, int mode, | |
68 | const char *name, V9fsSynthNode **result) | |
69 | { | |
70 | int ret; | |
71 | V9fsSynthNode *node, *tmp; | |
72 | ||
73 | if (!v9fs_synth_fs) { | |
74 | return EAGAIN; | |
75 | } | |
76 | if (!name || (strlen(name) >= NAME_MAX)) { | |
77 | return EINVAL; | |
78 | } | |
79 | if (!parent) { | |
80 | parent = &v9fs_synth_root; | |
81 | } | |
2583e443 | 82 | qemu_mutex_lock(&v9fs_synth_mutex); |
9db221ae AK |
83 | QLIST_FOREACH(tmp, &parent->child, sibling) { |
84 | if (!strcmp(tmp->name, name)) { | |
85 | ret = EEXIST; | |
86 | goto err_out; | |
87 | } | |
88 | } | |
89 | /* Add the name */ | |
90 | node = v9fs_add_dir_node(parent, mode, name, NULL, v9fs_synth_node_count++); | |
91 | v9fs_add_dir_node(node, parent->attr->mode, "..", | |
92 | parent->attr, parent->attr->inode); | |
93 | v9fs_add_dir_node(node, node->attr->mode, ".", | |
94 | node->attr, node->attr->inode); | |
95 | *result = node; | |
96 | ret = 0; | |
97 | err_out: | |
2583e443 | 98 | qemu_mutex_unlock(&v9fs_synth_mutex); |
9db221ae AK |
99 | return ret; |
100 | } | |
101 | ||
102 | int qemu_v9fs_synth_add_file(V9fsSynthNode *parent, int mode, | |
103 | const char *name, v9fs_synth_read read, | |
104 | v9fs_synth_write write, void *arg) | |
105 | { | |
106 | int ret; | |
107 | V9fsSynthNode *node, *tmp; | |
108 | ||
109 | if (!v9fs_synth_fs) { | |
110 | return EAGAIN; | |
111 | } | |
112 | if (!name || (strlen(name) >= NAME_MAX)) { | |
113 | return EINVAL; | |
114 | } | |
115 | if (!parent) { | |
116 | parent = &v9fs_synth_root; | |
117 | } | |
118 | ||
2583e443 | 119 | qemu_mutex_lock(&v9fs_synth_mutex); |
9db221ae AK |
120 | QLIST_FOREACH(tmp, &parent->child, sibling) { |
121 | if (!strcmp(tmp->name, name)) { | |
122 | ret = EEXIST; | |
123 | goto err_out; | |
124 | } | |
125 | } | |
126 | /* Add file type and remove write bits */ | |
127 | mode = ((mode & 0777) | S_IFREG); | |
128 | node = g_malloc0(sizeof(V9fsSynthNode)); | |
129 | node->attr = &node->actual_attr; | |
130 | node->attr->inode = v9fs_synth_node_count++; | |
131 | node->attr->nlink = 1; | |
132 | node->attr->read = read; | |
133 | node->attr->write = write; | |
134 | node->attr->mode = mode; | |
135 | node->private = arg; | |
a79b5f8b | 136 | pstrcpy(node->name, sizeof(node->name), name); |
2583e443 | 137 | QLIST_INSERT_HEAD_RCU(&parent->child, node, sibling); |
9db221ae AK |
138 | ret = 0; |
139 | err_out: | |
2583e443 | 140 | qemu_mutex_unlock(&v9fs_synth_mutex); |
9db221ae AK |
141 | return ret; |
142 | } | |
143 | ||
144 | static void v9fs_synth_fill_statbuf(V9fsSynthNode *node, struct stat *stbuf) | |
145 | { | |
146 | stbuf->st_dev = 0; | |
147 | stbuf->st_ino = node->attr->inode; | |
148 | stbuf->st_mode = node->attr->mode; | |
149 | stbuf->st_nlink = node->attr->nlink; | |
150 | stbuf->st_uid = 0; | |
151 | stbuf->st_gid = 0; | |
152 | stbuf->st_rdev = 0; | |
153 | stbuf->st_size = 0; | |
154 | stbuf->st_blksize = 0; | |
155 | stbuf->st_blocks = 0; | |
156 | stbuf->st_atime = 0; | |
157 | stbuf->st_mtime = 0; | |
158 | stbuf->st_ctime = 0; | |
159 | } | |
160 | ||
161 | static int v9fs_synth_lstat(FsContext *fs_ctx, | |
162 | V9fsPath *fs_path, struct stat *stbuf) | |
163 | { | |
164 | V9fsSynthNode *node = *(V9fsSynthNode **)fs_path->data; | |
165 | ||
166 | v9fs_synth_fill_statbuf(node, stbuf); | |
167 | return 0; | |
168 | } | |
169 | ||
8b888272 | 170 | static int v9fs_synth_fstat(FsContext *fs_ctx, int fid_type, |
9db221ae AK |
171 | V9fsFidOpenState *fs, struct stat *stbuf) |
172 | { | |
173 | V9fsSynthOpenState *synth_open = fs->private; | |
174 | v9fs_synth_fill_statbuf(synth_open->node, stbuf); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int v9fs_synth_opendir(FsContext *ctx, | |
179 | V9fsPath *fs_path, V9fsFidOpenState *fs) | |
180 | { | |
181 | V9fsSynthOpenState *synth_open; | |
182 | V9fsSynthNode *node = *(V9fsSynthNode **)fs_path->data; | |
183 | ||
184 | synth_open = g_malloc(sizeof(*synth_open)); | |
185 | synth_open->node = node; | |
186 | node->open_count++; | |
187 | fs->private = synth_open; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int v9fs_synth_closedir(FsContext *ctx, V9fsFidOpenState *fs) | |
192 | { | |
193 | V9fsSynthOpenState *synth_open = fs->private; | |
194 | V9fsSynthNode *node = synth_open->node; | |
195 | ||
196 | node->open_count--; | |
197 | g_free(synth_open); | |
198 | fs->private = NULL; | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static off_t v9fs_synth_telldir(FsContext *ctx, V9fsFidOpenState *fs) | |
203 | { | |
204 | V9fsSynthOpenState *synth_open = fs->private; | |
205 | return synth_open->offset; | |
206 | } | |
207 | ||
208 | static void v9fs_synth_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) | |
209 | { | |
210 | V9fsSynthOpenState *synth_open = fs->private; | |
211 | synth_open->offset = off; | |
212 | } | |
213 | ||
214 | static void v9fs_synth_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) | |
215 | { | |
216 | v9fs_synth_seekdir(ctx, fs, 0); | |
217 | } | |
218 | ||
219 | static void v9fs_synth_direntry(V9fsSynthNode *node, | |
220 | struct dirent *entry, off_t off) | |
221 | { | |
222 | strcpy(entry->d_name, node->name); | |
223 | entry->d_ino = node->attr->inode; | |
224 | entry->d_off = off + 1; | |
225 | } | |
226 | ||
227 | static int v9fs_synth_get_dentry(V9fsSynthNode *dir, struct dirent *entry, | |
228 | struct dirent **result, off_t off) | |
229 | { | |
230 | int i = 0; | |
231 | V9fsSynthNode *node; | |
232 | ||
2583e443 | 233 | rcu_read_lock(); |
9db221ae AK |
234 | QLIST_FOREACH(node, &dir->child, sibling) { |
235 | /* This is the off child of the directory */ | |
236 | if (i == off) { | |
237 | break; | |
238 | } | |
239 | i++; | |
240 | } | |
2583e443 | 241 | rcu_read_unlock(); |
9db221ae AK |
242 | if (!node) { |
243 | /* end of directory */ | |
244 | *result = NULL; | |
245 | return 0; | |
246 | } | |
247 | v9fs_synth_direntry(node, entry, off); | |
248 | *result = entry; | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static int v9fs_synth_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, | |
253 | struct dirent *entry, struct dirent **result) | |
254 | { | |
255 | int ret; | |
256 | V9fsSynthOpenState *synth_open = fs->private; | |
257 | V9fsSynthNode *node = synth_open->node; | |
258 | ret = v9fs_synth_get_dentry(node, entry, result, synth_open->offset); | |
259 | if (!ret && *result != NULL) { | |
260 | synth_open->offset++; | |
261 | } | |
262 | return ret; | |
263 | } | |
264 | ||
265 | static int v9fs_synth_open(FsContext *ctx, V9fsPath *fs_path, | |
266 | int flags, V9fsFidOpenState *fs) | |
267 | { | |
268 | V9fsSynthOpenState *synth_open; | |
269 | V9fsSynthNode *node = *(V9fsSynthNode **)fs_path->data; | |
270 | ||
271 | synth_open = g_malloc(sizeof(*synth_open)); | |
272 | synth_open->node = node; | |
273 | node->open_count++; | |
274 | fs->private = synth_open; | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int v9fs_synth_open2(FsContext *fs_ctx, V9fsPath *dir_path, | |
279 | const char *name, int flags, | |
280 | FsCred *credp, V9fsFidOpenState *fs) | |
281 | { | |
282 | errno = ENOSYS; | |
283 | return -1; | |
284 | } | |
285 | ||
286 | static int v9fs_synth_close(FsContext *ctx, V9fsFidOpenState *fs) | |
287 | { | |
288 | V9fsSynthOpenState *synth_open = fs->private; | |
289 | V9fsSynthNode *node = synth_open->node; | |
290 | ||
291 | node->open_count--; | |
292 | g_free(synth_open); | |
293 | fs->private = NULL; | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static ssize_t v9fs_synth_pwritev(FsContext *ctx, V9fsFidOpenState *fs, | |
298 | const struct iovec *iov, | |
299 | int iovcnt, off_t offset) | |
300 | { | |
301 | int i, count = 0, wcount; | |
302 | V9fsSynthOpenState *synth_open = fs->private; | |
303 | V9fsSynthNode *node = synth_open->node; | |
304 | if (!node->attr->write) { | |
305 | errno = EPERM; | |
306 | return -1; | |
307 | } | |
308 | for (i = 0; i < iovcnt; i++) { | |
309 | wcount = node->attr->write(iov[i].iov_base, iov[i].iov_len, | |
310 | offset, node->private); | |
311 | offset += wcount; | |
312 | count += wcount; | |
313 | /* If we wrote less than requested. we are done */ | |
314 | if (wcount < iov[i].iov_len) { | |
315 | break; | |
316 | } | |
317 | } | |
318 | return count; | |
319 | } | |
320 | ||
321 | static ssize_t v9fs_synth_preadv(FsContext *ctx, V9fsFidOpenState *fs, | |
322 | const struct iovec *iov, | |
323 | int iovcnt, off_t offset) | |
324 | { | |
325 | int i, count = 0, rcount; | |
326 | V9fsSynthOpenState *synth_open = fs->private; | |
327 | V9fsSynthNode *node = synth_open->node; | |
328 | if (!node->attr->read) { | |
329 | errno = EPERM; | |
330 | return -1; | |
331 | } | |
332 | for (i = 0; i < iovcnt; i++) { | |
333 | rcount = node->attr->read(iov[i].iov_base, iov[i].iov_len, | |
334 | offset, node->private); | |
335 | offset += rcount; | |
336 | count += rcount; | |
337 | /* If we read less than requested. we are done */ | |
338 | if (rcount < iov[i].iov_len) { | |
339 | break; | |
340 | } | |
341 | } | |
342 | return count; | |
343 | } | |
344 | ||
345 | static int v9fs_synth_truncate(FsContext *ctx, V9fsPath *path, off_t offset) | |
346 | { | |
347 | errno = ENOSYS; | |
348 | return -1; | |
349 | } | |
350 | ||
351 | static int v9fs_synth_chmod(FsContext *fs_ctx, V9fsPath *path, FsCred *credp) | |
352 | { | |
353 | errno = EPERM; | |
354 | return -1; | |
355 | } | |
356 | ||
357 | static int v9fs_synth_mknod(FsContext *fs_ctx, V9fsPath *path, | |
358 | const char *buf, FsCred *credp) | |
359 | { | |
360 | errno = EPERM; | |
361 | return -1; | |
362 | } | |
363 | ||
364 | static int v9fs_synth_mkdir(FsContext *fs_ctx, V9fsPath *path, | |
365 | const char *buf, FsCred *credp) | |
366 | { | |
367 | errno = EPERM; | |
368 | return -1; | |
369 | } | |
370 | ||
371 | static ssize_t v9fs_synth_readlink(FsContext *fs_ctx, V9fsPath *path, | |
372 | char *buf, size_t bufsz) | |
373 | { | |
374 | errno = ENOSYS; | |
375 | return -1; | |
376 | } | |
377 | ||
378 | static int v9fs_synth_symlink(FsContext *fs_ctx, const char *oldpath, | |
379 | V9fsPath *newpath, const char *buf, FsCred *credp) | |
380 | { | |
381 | errno = EPERM; | |
382 | return -1; | |
383 | } | |
384 | ||
385 | static int v9fs_synth_link(FsContext *fs_ctx, V9fsPath *oldpath, | |
386 | V9fsPath *newpath, const char *buf) | |
387 | { | |
388 | errno = EPERM; | |
389 | return -1; | |
390 | } | |
391 | ||
392 | static int v9fs_synth_rename(FsContext *ctx, const char *oldpath, | |
393 | const char *newpath) | |
394 | { | |
395 | errno = EPERM; | |
396 | return -1; | |
397 | } | |
398 | ||
399 | static int v9fs_synth_chown(FsContext *fs_ctx, V9fsPath *path, FsCred *credp) | |
400 | { | |
401 | errno = EPERM; | |
402 | return -1; | |
403 | } | |
404 | ||
405 | static int v9fs_synth_utimensat(FsContext *fs_ctx, V9fsPath *path, | |
406 | const struct timespec *buf) | |
407 | { | |
408 | errno = EPERM; | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static int v9fs_synth_remove(FsContext *ctx, const char *path) | |
413 | { | |
414 | errno = EPERM; | |
415 | return -1; | |
416 | } | |
417 | ||
8b888272 AK |
418 | static int v9fs_synth_fsync(FsContext *ctx, int fid_type, |
419 | V9fsFidOpenState *fs, int datasync) | |
9db221ae AK |
420 | { |
421 | errno = ENOSYS; | |
422 | return 0; | |
423 | } | |
424 | ||
425 | static int v9fs_synth_statfs(FsContext *s, V9fsPath *fs_path, | |
426 | struct statfs *stbuf) | |
427 | { | |
428 | stbuf->f_type = 0xABCD; | |
429 | stbuf->f_bsize = 512; | |
430 | stbuf->f_blocks = 0; | |
431 | stbuf->f_files = v9fs_synth_node_count; | |
432 | stbuf->f_namelen = NAME_MAX; | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static ssize_t v9fs_synth_lgetxattr(FsContext *ctx, V9fsPath *path, | |
437 | const char *name, void *value, size_t size) | |
438 | { | |
439 | errno = ENOTSUP; | |
440 | return -1; | |
441 | } | |
442 | ||
443 | static ssize_t v9fs_synth_llistxattr(FsContext *ctx, V9fsPath *path, | |
444 | void *value, size_t size) | |
445 | { | |
446 | errno = ENOTSUP; | |
447 | return -1; | |
448 | } | |
449 | ||
450 | static int v9fs_synth_lsetxattr(FsContext *ctx, V9fsPath *path, | |
451 | const char *name, void *value, | |
452 | size_t size, int flags) | |
453 | { | |
454 | errno = ENOTSUP; | |
455 | return -1; | |
456 | } | |
457 | ||
458 | static int v9fs_synth_lremovexattr(FsContext *ctx, | |
459 | V9fsPath *path, const char *name) | |
460 | { | |
461 | errno = ENOTSUP; | |
462 | return -1; | |
463 | } | |
464 | ||
465 | static int v9fs_synth_name_to_path(FsContext *ctx, V9fsPath *dir_path, | |
466 | const char *name, V9fsPath *target) | |
467 | { | |
468 | V9fsSynthNode *node; | |
469 | V9fsSynthNode *dir_node; | |
470 | ||
471 | /* "." and ".." are not allowed */ | |
472 | if (!strcmp(name, ".") || !strcmp(name, "..")) { | |
473 | errno = EINVAL; | |
474 | return -1; | |
475 | ||
476 | } | |
477 | if (!dir_path) { | |
478 | dir_node = &v9fs_synth_root; | |
479 | } else { | |
480 | dir_node = *(V9fsSynthNode **)dir_path->data; | |
481 | } | |
482 | if (!strcmp(name, "/")) { | |
483 | node = dir_node; | |
484 | goto out; | |
485 | } | |
486 | /* search for the name in the childern */ | |
2583e443 | 487 | rcu_read_lock(); |
9db221ae AK |
488 | QLIST_FOREACH(node, &dir_node->child, sibling) { |
489 | if (!strcmp(node->name, name)) { | |
490 | break; | |
491 | } | |
492 | } | |
2583e443 HPB |
493 | rcu_read_unlock(); |
494 | ||
9db221ae AK |
495 | if (!node) { |
496 | errno = ENOENT; | |
497 | return -1; | |
498 | } | |
499 | out: | |
500 | /* Copy the node pointer to fid */ | |
501 | target->data = g_malloc(sizeof(void *)); | |
502 | memcpy(target->data, &node, sizeof(void *)); | |
503 | target->size = sizeof(void *); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | static int v9fs_synth_renameat(FsContext *ctx, V9fsPath *olddir, | |
508 | const char *old_name, V9fsPath *newdir, | |
509 | const char *new_name) | |
510 | { | |
511 | errno = EPERM; | |
512 | return -1; | |
513 | } | |
514 | ||
515 | static int v9fs_synth_unlinkat(FsContext *ctx, V9fsPath *dir, | |
516 | const char *name, int flags) | |
517 | { | |
518 | errno = EPERM; | |
519 | return -1; | |
520 | } | |
521 | ||
522 | static int v9fs_synth_init(FsContext *ctx) | |
523 | { | |
9db221ae | 524 | QLIST_INIT(&v9fs_synth_root.child); |
2583e443 | 525 | qemu_mutex_init(&v9fs_synth_mutex); |
9db221ae AK |
526 | |
527 | /* Add "." and ".." entries for root */ | |
528 | v9fs_add_dir_node(&v9fs_synth_root, v9fs_synth_root.attr->mode, | |
529 | "..", v9fs_synth_root.attr, v9fs_synth_root.attr->inode); | |
530 | v9fs_add_dir_node(&v9fs_synth_root, v9fs_synth_root.attr->mode, | |
531 | ".", v9fs_synth_root.attr, v9fs_synth_root.attr->inode); | |
532 | ||
533 | /* Mark the subsystem is ready for use */ | |
534 | v9fs_synth_fs = 1; | |
535 | return 0; | |
536 | } | |
537 | ||
538 | FileOperations synth_ops = { | |
539 | .init = v9fs_synth_init, | |
540 | .lstat = v9fs_synth_lstat, | |
541 | .readlink = v9fs_synth_readlink, | |
542 | .close = v9fs_synth_close, | |
543 | .closedir = v9fs_synth_closedir, | |
544 | .open = v9fs_synth_open, | |
545 | .opendir = v9fs_synth_opendir, | |
546 | .rewinddir = v9fs_synth_rewinddir, | |
547 | .telldir = v9fs_synth_telldir, | |
548 | .readdir_r = v9fs_synth_readdir_r, | |
549 | .seekdir = v9fs_synth_seekdir, | |
550 | .preadv = v9fs_synth_preadv, | |
551 | .pwritev = v9fs_synth_pwritev, | |
552 | .chmod = v9fs_synth_chmod, | |
553 | .mknod = v9fs_synth_mknod, | |
554 | .mkdir = v9fs_synth_mkdir, | |
555 | .fstat = v9fs_synth_fstat, | |
556 | .open2 = v9fs_synth_open2, | |
557 | .symlink = v9fs_synth_symlink, | |
558 | .link = v9fs_synth_link, | |
559 | .truncate = v9fs_synth_truncate, | |
560 | .rename = v9fs_synth_rename, | |
561 | .chown = v9fs_synth_chown, | |
562 | .utimensat = v9fs_synth_utimensat, | |
563 | .remove = v9fs_synth_remove, | |
564 | .fsync = v9fs_synth_fsync, | |
565 | .statfs = v9fs_synth_statfs, | |
566 | .lgetxattr = v9fs_synth_lgetxattr, | |
567 | .llistxattr = v9fs_synth_llistxattr, | |
568 | .lsetxattr = v9fs_synth_lsetxattr, | |
569 | .lremovexattr = v9fs_synth_lremovexattr, | |
570 | .name_to_path = v9fs_synth_name_to_path, | |
571 | .renameat = v9fs_synth_renameat, | |
572 | .unlinkat = v9fs_synth_unlinkat, | |
573 | }; |