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Commit | Line | Data |
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9f107513 AL |
1 | /* |
2 | * Virtio 9p backend | |
3 | * | |
4 | * Copyright IBM, Corp. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
fbc04127 | 14 | #include "qemu/osdep.h" |
e3e83f2e | 15 | #include <glib/gprintf.h> |
0d09e41a | 16 | #include "hw/virtio/virtio.h" |
da34e65c | 17 | #include "qapi/error.h" |
d49b6836 | 18 | #include "qemu/error-report.h" |
cd4bfbb2 | 19 | #include "qemu/iov.h" |
db725815 | 20 | #include "qemu/main-loop.h" |
1de7afc9 | 21 | #include "qemu/sockets.h" |
9f107513 AL |
22 | #include "virtio-9p.h" |
23 | #include "fsdev/qemu-fsdev.h" | |
267ae092 | 24 | #include "9p-xattr.h" |
fe52840c | 25 | #include "coth.h" |
c572f23a | 26 | #include "trace.h" |
795c40b8 | 27 | #include "migration/blocker.h" |
357e2f7f | 28 | #include "sysemu/qtest.h" |
1a6ed33c | 29 | #include "qemu/xxhash.h" |
6b6aa828 | 30 | #include <math.h> |
9f107513 | 31 | |
7a462745 AK |
32 | int open_fd_hw; |
33 | int total_open_fd; | |
34 | static int open_fd_rc; | |
9f107513 | 35 | |
fac4f111 VJ |
36 | enum { |
37 | Oread = 0x00, | |
38 | Owrite = 0x01, | |
39 | Ordwr = 0x02, | |
40 | Oexec = 0x03, | |
41 | Oexcl = 0x04, | |
42 | Otrunc = 0x10, | |
43 | Orexec = 0x20, | |
44 | Orclose = 0x40, | |
45 | Oappend = 0x80, | |
46 | }; | |
47 | ||
75673590 | 48 | static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
0e2082d9 WL |
49 | { |
50 | ssize_t ret; | |
51 | va_list ap; | |
52 | ||
53 | va_start(ap, fmt); | |
ea83441c | 54 | ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); |
0e2082d9 WL |
55 | va_end(ap); |
56 | ||
57 | return ret; | |
58 | } | |
59 | ||
75673590 | 60 | static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
0e2082d9 WL |
61 | { |
62 | ssize_t ret; | |
63 | va_list ap; | |
64 | ||
65 | va_start(ap, fmt); | |
ea83441c | 66 | ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); |
0e2082d9 WL |
67 | va_end(ap); |
68 | ||
69 | return ret; | |
70 | } | |
71 | ||
fac4f111 VJ |
72 | static int omode_to_uflags(int8_t mode) |
73 | { | |
74 | int ret = 0; | |
75 | ||
76 | switch (mode & 3) { | |
77 | case Oread: | |
78 | ret = O_RDONLY; | |
79 | break; | |
80 | case Ordwr: | |
81 | ret = O_RDWR; | |
82 | break; | |
83 | case Owrite: | |
84 | ret = O_WRONLY; | |
85 | break; | |
86 | case Oexec: | |
87 | ret = O_RDONLY; | |
88 | break; | |
89 | } | |
90 | ||
91 | if (mode & Otrunc) { | |
92 | ret |= O_TRUNC; | |
93 | } | |
94 | ||
95 | if (mode & Oappend) { | |
96 | ret |= O_APPEND; | |
97 | } | |
98 | ||
99 | if (mode & Oexcl) { | |
100 | ret |= O_EXCL; | |
101 | } | |
102 | ||
103 | return ret; | |
104 | } | |
105 | ||
8e71b96c | 106 | typedef struct DotlOpenflagMap { |
9844081b MK |
107 | int dotl_flag; |
108 | int open_flag; | |
8e71b96c | 109 | } DotlOpenflagMap; |
9844081b MK |
110 | |
111 | static int dotl_to_open_flags(int flags) | |
112 | { | |
113 | int i; | |
114 | /* | |
115 | * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY | |
116 | * and P9_DOTL_NOACCESS | |
117 | */ | |
118 | int oflags = flags & O_ACCMODE; | |
119 | ||
8e71b96c | 120 | DotlOpenflagMap dotl_oflag_map[] = { |
9844081b MK |
121 | { P9_DOTL_CREATE, O_CREAT }, |
122 | { P9_DOTL_EXCL, O_EXCL }, | |
123 | { P9_DOTL_NOCTTY , O_NOCTTY }, | |
124 | { P9_DOTL_TRUNC, O_TRUNC }, | |
125 | { P9_DOTL_APPEND, O_APPEND }, | |
126 | { P9_DOTL_NONBLOCK, O_NONBLOCK } , | |
127 | { P9_DOTL_DSYNC, O_DSYNC }, | |
128 | { P9_DOTL_FASYNC, FASYNC }, | |
129 | { P9_DOTL_DIRECT, O_DIRECT }, | |
130 | { P9_DOTL_LARGEFILE, O_LARGEFILE }, | |
131 | { P9_DOTL_DIRECTORY, O_DIRECTORY }, | |
132 | { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, | |
133 | { P9_DOTL_NOATIME, O_NOATIME }, | |
134 | { P9_DOTL_SYNC, O_SYNC }, | |
135 | }; | |
136 | ||
137 | for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { | |
138 | if (flags & dotl_oflag_map[i].dotl_flag) { | |
139 | oflags |= dotl_oflag_map[i].open_flag; | |
140 | } | |
141 | } | |
142 | ||
143 | return oflags; | |
144 | } | |
145 | ||
758e8e38 | 146 | void cred_init(FsCred *credp) |
131dcb25 | 147 | { |
758e8e38 VJ |
148 | credp->fc_uid = -1; |
149 | credp->fc_gid = -1; | |
150 | credp->fc_mode = -1; | |
151 | credp->fc_rdev = -1; | |
131dcb25 AL |
152 | } |
153 | ||
d3ab98e6 AK |
154 | static int get_dotl_openflags(V9fsState *s, int oflags) |
155 | { | |
156 | int flags; | |
157 | /* | |
158 | * Filter the client open flags | |
159 | */ | |
9844081b MK |
160 | flags = dotl_to_open_flags(oflags); |
161 | flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); | |
d3ab98e6 AK |
162 | /* |
163 | * Ignore direct disk access hint until the server supports it. | |
164 | */ | |
165 | flags &= ~O_DIRECT; | |
166 | return flags; | |
167 | } | |
168 | ||
2289be19 AK |
169 | void v9fs_path_init(V9fsPath *path) |
170 | { | |
171 | path->data = NULL; | |
172 | path->size = 0; | |
173 | } | |
174 | ||
175 | void v9fs_path_free(V9fsPath *path) | |
176 | { | |
177 | g_free(path->data); | |
178 | path->data = NULL; | |
179 | path->size = 0; | |
180 | } | |
181 | ||
e3e83f2e GK |
182 | |
183 | void GCC_FMT_ATTR(2, 3) | |
184 | v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) | |
185 | { | |
186 | va_list ap; | |
187 | ||
188 | v9fs_path_free(path); | |
189 | ||
190 | va_start(ap, fmt); | |
191 | /* Bump the size for including terminating NULL */ | |
192 | path->size = g_vasprintf(&path->data, fmt, ap) + 1; | |
193 | va_end(ap); | |
194 | } | |
195 | ||
e446a1eb | 196 | void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) |
2289be19 | 197 | { |
e446a1eb MAL |
198 | v9fs_path_free(dst); |
199 | dst->size = src->size; | |
200 | dst->data = g_memdup(src->data, src->size); | |
2289be19 AK |
201 | } |
202 | ||
203 | int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, | |
204 | const char *name, V9fsPath *path) | |
205 | { | |
206 | int err; | |
207 | err = s->ops->name_to_path(&s->ctx, dirpath, name, path); | |
208 | if (err < 0) { | |
209 | err = -errno; | |
210 | } | |
211 | return err; | |
212 | } | |
213 | ||
936532a4 MN |
214 | /* |
215 | * Return TRUE if s1 is an ancestor of s2. | |
216 | * | |
217 | * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". | |
218 | * As a special case, We treat s1 as ancestor of s2 if they are same! | |
219 | */ | |
2289be19 | 220 | static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) |
936532a4 | 221 | { |
2289be19 AK |
222 | if (!strncmp(s1->data, s2->data, s1->size - 1)) { |
223 | if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { | |
936532a4 MN |
224 | return 1; |
225 | } | |
226 | } | |
227 | return 0; | |
228 | } | |
229 | ||
a03f7874 AL |
230 | static size_t v9fs_string_size(V9fsString *str) |
231 | { | |
232 | return str->size; | |
233 | } | |
234 | ||
b9cb88b0 AK |
235 | /* |
236 | * returns 0 if fid got re-opened, 1 if not, < 0 on error */ | |
8440e22e | 237 | static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) |
b9cb88b0 AK |
238 | { |
239 | int err = 1; | |
240 | if (f->fid_type == P9_FID_FILE) { | |
241 | if (f->fs.fd == -1) { | |
242 | do { | |
bccacf6c AK |
243 | err = v9fs_co_open(pdu, f, f->open_flags); |
244 | } while (err == -EINTR && !pdu->cancelled); | |
b9cb88b0 AK |
245 | } |
246 | } else if (f->fid_type == P9_FID_DIR) { | |
f314ea4e | 247 | if (f->fs.dir.stream == NULL) { |
b9cb88b0 | 248 | do { |
bccacf6c AK |
249 | err = v9fs_co_opendir(pdu, f); |
250 | } while (err == -EINTR && !pdu->cancelled); | |
b9cb88b0 AK |
251 | } |
252 | } | |
253 | return err; | |
254 | } | |
255 | ||
8440e22e | 256 | static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) |
286d5652 | 257 | { |
7a462745 | 258 | int err; |
286d5652 | 259 | V9fsFidState *f; |
bccacf6c | 260 | V9fsState *s = pdu->s; |
286d5652 AL |
261 | |
262 | for (f = s->fid_list; f; f = f->next) { | |
84dfb926 | 263 | BUG_ON(f->clunked); |
286d5652 | 264 | if (f->fid == fid) { |
7a462745 AK |
265 | /* |
266 | * Update the fid ref upfront so that | |
267 | * we don't get reclaimed when we yield | |
268 | * in open later. | |
269 | */ | |
84dfb926 | 270 | f->ref++; |
7a462745 AK |
271 | /* |
272 | * check whether we need to reopen the | |
273 | * file. We might have closed the fd | |
274 | * while trying to free up some file | |
275 | * descriptors. | |
276 | */ | |
bccacf6c | 277 | err = v9fs_reopen_fid(pdu, f); |
b9cb88b0 AK |
278 | if (err < 0) { |
279 | f->ref--; | |
280 | return NULL; | |
281 | } | |
7a462745 AK |
282 | /* |
283 | * Mark the fid as referenced so that the LRU | |
284 | * reclaim won't close the file descriptor | |
285 | */ | |
286 | f->flags |= FID_REFERENCED; | |
286d5652 AL |
287 | return f; |
288 | } | |
289 | } | |
286d5652 AL |
290 | return NULL; |
291 | } | |
292 | ||
293 | static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) | |
294 | { | |
295 | V9fsFidState *f; | |
296 | ||
84dfb926 AK |
297 | for (f = s->fid_list; f; f = f->next) { |
298 | /* If fid is already there return NULL */ | |
299 | BUG_ON(f->clunked); | |
300 | if (f->fid == fid) { | |
301 | return NULL; | |
302 | } | |
286d5652 | 303 | } |
7267c094 | 304 | f = g_malloc0(sizeof(V9fsFidState)); |
286d5652 | 305 | f->fid = fid; |
d62dbb51 | 306 | f->fid_type = P9_FID_NONE; |
84dfb926 | 307 | f->ref = 1; |
7a462745 AK |
308 | /* |
309 | * Mark the fid as referenced so that the LRU | |
310 | * reclaim won't close the file descriptor | |
311 | */ | |
312 | f->flags |= FID_REFERENCED; | |
286d5652 AL |
313 | f->next = s->fid_list; |
314 | s->fid_list = f; | |
315 | ||
7cde47d4 GK |
316 | v9fs_readdir_init(&f->fs.dir); |
317 | v9fs_readdir_init(&f->fs_reclaim.dir); | |
318 | ||
286d5652 AL |
319 | return f; |
320 | } | |
321 | ||
8440e22e | 322 | static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) |
10b468bd AK |
323 | { |
324 | int retval = 0; | |
325 | ||
dd28fbbc | 326 | if (fidp->fs.xattr.xattrwalk_fid) { |
10b468bd AK |
327 | /* getxattr/listxattr fid */ |
328 | goto free_value; | |
329 | } | |
330 | /* | |
331 | * if this is fid for setxattr. clunk should | |
332 | * result in setxattr localcall | |
333 | */ | |
334 | if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { | |
335 | /* clunk after partial write */ | |
336 | retval = -EINVAL; | |
337 | goto free_out; | |
338 | } | |
9ed3ef26 | 339 | if (fidp->fs.xattr.len) { |
bccacf6c | 340 | retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, |
9ed3ef26 AK |
341 | fidp->fs.xattr.value, |
342 | fidp->fs.xattr.len, | |
343 | fidp->fs.xattr.flags); | |
344 | } else { | |
bccacf6c | 345 | retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); |
9ed3ef26 | 346 | } |
10b468bd AK |
347 | free_out: |
348 | v9fs_string_free(&fidp->fs.xattr.name); | |
349 | free_value: | |
9e288406 | 350 | g_free(fidp->fs.xattr.value); |
10b468bd AK |
351 | return retval; |
352 | } | |
353 | ||
8440e22e | 354 | static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) |
286d5652 | 355 | { |
10b468bd | 356 | int retval = 0; |
84dfb926 AK |
357 | |
358 | if (fidp->fid_type == P9_FID_FILE) { | |
7a462745 AK |
359 | /* If we reclaimed the fd no need to close */ |
360 | if (fidp->fs.fd != -1) { | |
cc720ddb | 361 | retval = v9fs_co_close(pdu, &fidp->fs); |
7a462745 | 362 | } |
84dfb926 | 363 | } else if (fidp->fid_type == P9_FID_DIR) { |
f314ea4e | 364 | if (fidp->fs.dir.stream != NULL) { |
cc720ddb | 365 | retval = v9fs_co_closedir(pdu, &fidp->fs); |
95f65511 | 366 | } |
84dfb926 | 367 | } else if (fidp->fid_type == P9_FID_XATTR) { |
bccacf6c | 368 | retval = v9fs_xattr_fid_clunk(pdu, fidp); |
84dfb926 | 369 | } |
2289be19 | 370 | v9fs_path_free(&fidp->path); |
84dfb926 AK |
371 | g_free(fidp); |
372 | return retval; | |
373 | } | |
374 | ||
8440e22e | 375 | static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) |
84dfb926 AK |
376 | { |
377 | BUG_ON(!fidp->ref); | |
378 | fidp->ref--; | |
7a462745 AK |
379 | /* |
380 | * Don't free the fid if it is in reclaim list | |
381 | */ | |
84dfb926 | 382 | if (!fidp->ref && fidp->clunked) { |
e9a0152b AK |
383 | if (fidp->fid == pdu->s->root_fid) { |
384 | /* | |
385 | * if the clunked fid is root fid then we | |
386 | * have unmounted the fs on the client side. | |
387 | * delete the migration blocker. Ideally, this | |
388 | * should be hooked to transport close notification | |
389 | */ | |
390 | if (pdu->s->migration_blocker) { | |
391 | migrate_del_blocker(pdu->s->migration_blocker); | |
392 | error_free(pdu->s->migration_blocker); | |
393 | pdu->s->migration_blocker = NULL; | |
394 | } | |
395 | } | |
a911a182 | 396 | return free_fid(pdu, fidp); |
84dfb926 | 397 | } |
a911a182 | 398 | return 0; |
84dfb926 AK |
399 | } |
400 | ||
ce421a19 | 401 | static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) |
84dfb926 | 402 | { |
286d5652 AL |
403 | V9fsFidState **fidpp, *fidp; |
404 | ||
405 | for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { | |
406 | if ((*fidpp)->fid == fid) { | |
407 | break; | |
408 | } | |
409 | } | |
286d5652 | 410 | if (*fidpp == NULL) { |
ce421a19 | 411 | return NULL; |
286d5652 | 412 | } |
286d5652 AL |
413 | fidp = *fidpp; |
414 | *fidpp = fidp->next; | |
84dfb926 | 415 | fidp->clunked = 1; |
ce421a19 | 416 | return fidp; |
286d5652 AL |
417 | } |
418 | ||
8440e22e | 419 | void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) |
7a462745 AK |
420 | { |
421 | int reclaim_count = 0; | |
bccacf6c | 422 | V9fsState *s = pdu->s; |
7a462745 AK |
423 | V9fsFidState *f, *reclaim_list = NULL; |
424 | ||
425 | for (f = s->fid_list; f; f = f->next) { | |
426 | /* | |
427 | * Unlink fids cannot be reclaimed. Check | |
428 | * for them and skip them. Also skip fids | |
429 | * currently being operated on. | |
430 | */ | |
431 | if (f->ref || f->flags & FID_NON_RECLAIMABLE) { | |
432 | continue; | |
433 | } | |
434 | /* | |
435 | * if it is a recently referenced fid | |
436 | * we leave the fid untouched and clear the | |
437 | * reference bit. We come back to it later | |
438 | * in the next iteration. (a simple LRU without | |
439 | * moving list elements around) | |
440 | */ | |
441 | if (f->flags & FID_REFERENCED) { | |
442 | f->flags &= ~FID_REFERENCED; | |
443 | continue; | |
444 | } | |
445 | /* | |
446 | * Add fids to reclaim list. | |
447 | */ | |
448 | if (f->fid_type == P9_FID_FILE) { | |
449 | if (f->fs.fd != -1) { | |
450 | /* | |
451 | * Up the reference count so that | |
452 | * a clunk request won't free this fid | |
453 | */ | |
454 | f->ref++; | |
455 | f->rclm_lst = reclaim_list; | |
456 | reclaim_list = f; | |
457 | f->fs_reclaim.fd = f->fs.fd; | |
458 | f->fs.fd = -1; | |
459 | reclaim_count++; | |
460 | } | |
95f65511 | 461 | } else if (f->fid_type == P9_FID_DIR) { |
f314ea4e | 462 | if (f->fs.dir.stream != NULL) { |
95f65511 AK |
463 | /* |
464 | * Up the reference count so that | |
465 | * a clunk request won't free this fid | |
466 | */ | |
467 | f->ref++; | |
468 | f->rclm_lst = reclaim_list; | |
469 | reclaim_list = f; | |
f314ea4e GK |
470 | f->fs_reclaim.dir.stream = f->fs.dir.stream; |
471 | f->fs.dir.stream = NULL; | |
95f65511 AK |
472 | reclaim_count++; |
473 | } | |
7a462745 AK |
474 | } |
475 | if (reclaim_count >= open_fd_rc) { | |
476 | break; | |
477 | } | |
478 | } | |
479 | /* | |
480 | * Now close the fid in reclaim list. Free them if they | |
481 | * are already clunked. | |
482 | */ | |
483 | while (reclaim_list) { | |
484 | f = reclaim_list; | |
485 | reclaim_list = f->rclm_lst; | |
486 | if (f->fid_type == P9_FID_FILE) { | |
cc720ddb | 487 | v9fs_co_close(pdu, &f->fs_reclaim); |
95f65511 | 488 | } else if (f->fid_type == P9_FID_DIR) { |
cc720ddb | 489 | v9fs_co_closedir(pdu, &f->fs_reclaim); |
7a462745 AK |
490 | } |
491 | f->rclm_lst = NULL; | |
492 | /* | |
493 | * Now drop the fid reference, free it | |
494 | * if clunked. | |
495 | */ | |
bccacf6c | 496 | put_fid(pdu, f); |
7a462745 AK |
497 | } |
498 | } | |
499 | ||
8440e22e | 500 | static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) |
7a462745 AK |
501 | { |
502 | int err; | |
bccacf6c | 503 | V9fsState *s = pdu->s; |
7a462745 AK |
504 | V9fsFidState *fidp, head_fid; |
505 | ||
506 | head_fid.next = s->fid_list; | |
507 | for (fidp = s->fid_list; fidp; fidp = fidp->next) { | |
2289be19 AK |
508 | if (fidp->path.size != path->size) { |
509 | continue; | |
510 | } | |
511 | if (!memcmp(fidp->path.data, path->data, path->size)) { | |
7a462745 AK |
512 | /* Mark the fid non reclaimable. */ |
513 | fidp->flags |= FID_NON_RECLAIMABLE; | |
b9cb88b0 AK |
514 | |
515 | /* reopen the file/dir if already closed */ | |
bccacf6c | 516 | err = v9fs_reopen_fid(pdu, fidp); |
b9cb88b0 | 517 | if (err < 0) { |
267fcadf | 518 | return err; |
b9cb88b0 AK |
519 | } |
520 | /* | |
521 | * Go back to head of fid list because | |
522 | * the list could have got updated when | |
523 | * switched to the worker thread | |
524 | */ | |
525 | if (err == 0) { | |
7a462745 AK |
526 | fidp = &head_fid; |
527 | } | |
528 | } | |
529 | } | |
530 | return 0; | |
531 | } | |
532 | ||
8440e22e | 533 | static void coroutine_fn virtfs_reset(V9fsPDU *pdu) |
b41e2992 DS |
534 | { |
535 | V9fsState *s = pdu->s; | |
79decce3 | 536 | V9fsFidState *fidp; |
b41e2992 DS |
537 | |
538 | /* Free all fids */ | |
539 | while (s->fid_list) { | |
6d54af0e | 540 | /* Get fid */ |
b41e2992 | 541 | fidp = s->fid_list; |
6d54af0e GK |
542 | fidp->ref++; |
543 | ||
544 | /* Clunk fid */ | |
b41e2992 | 545 | s->fid_list = fidp->next; |
6d54af0e | 546 | fidp->clunked = 1; |
b41e2992 | 547 | |
6d54af0e | 548 | put_fid(pdu, fidp); |
b41e2992 | 549 | } |
b41e2992 DS |
550 | } |
551 | ||
286d5652 AL |
552 | #define P9_QID_TYPE_DIR 0x80 |
553 | #define P9_QID_TYPE_SYMLINK 0x02 | |
554 | ||
555 | #define P9_STAT_MODE_DIR 0x80000000 | |
556 | #define P9_STAT_MODE_APPEND 0x40000000 | |
557 | #define P9_STAT_MODE_EXCL 0x20000000 | |
558 | #define P9_STAT_MODE_MOUNT 0x10000000 | |
559 | #define P9_STAT_MODE_AUTH 0x08000000 | |
560 | #define P9_STAT_MODE_TMP 0x04000000 | |
561 | #define P9_STAT_MODE_SYMLINK 0x02000000 | |
562 | #define P9_STAT_MODE_LINK 0x01000000 | |
563 | #define P9_STAT_MODE_DEVICE 0x00800000 | |
564 | #define P9_STAT_MODE_NAMED_PIPE 0x00200000 | |
565 | #define P9_STAT_MODE_SOCKET 0x00100000 | |
566 | #define P9_STAT_MODE_SETUID 0x00080000 | |
567 | #define P9_STAT_MODE_SETGID 0x00040000 | |
568 | #define P9_STAT_MODE_SETVTX 0x00010000 | |
569 | ||
570 | #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ | |
571 | P9_STAT_MODE_SYMLINK | \ | |
572 | P9_STAT_MODE_LINK | \ | |
573 | P9_STAT_MODE_DEVICE | \ | |
574 | P9_STAT_MODE_NAMED_PIPE | \ | |
575 | P9_STAT_MODE_SOCKET) | |
576 | ||
6b6aa828 CS |
577 | /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ |
578 | static inline uint8_t mirror8bit(uint8_t byte) | |
579 | { | |
580 | return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; | |
581 | } | |
582 | ||
583 | /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ | |
584 | static inline uint64_t mirror64bit(uint64_t value) | |
585 | { | |
586 | return ((uint64_t)mirror8bit(value & 0xff) << 56) | | |
587 | ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | | |
588 | ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | | |
589 | ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | | |
590 | ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | | |
591 | ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | | |
592 | ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | | |
593 | ((uint64_t)mirror8bit((value >> 56) & 0xff)); | |
594 | } | |
595 | ||
596 | /** | |
597 | * @brief Parameter k for the Exponential Golomb algorihm to be used. | |
598 | * | |
599 | * The smaller this value, the smaller the minimum bit count for the Exp. | |
600 | * Golomb generated affixes will be (at lowest index) however for the | |
601 | * price of having higher maximum bit count of generated affixes (at highest | |
602 | * index). Likewise increasing this parameter yields in smaller maximum bit | |
603 | * count for the price of having higher minimum bit count. | |
604 | * | |
605 | * In practice that means: a good value for k depends on the expected amount | |
606 | * of devices to be exposed by one export. For a small amount of devices k | |
607 | * should be small, for a large amount of devices k might be increased | |
608 | * instead. The default of k=0 should be fine for most users though. | |
609 | * | |
610 | * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of | |
611 | * k should not change as long as guest is still running! Because that would | |
612 | * cause completely different inode numbers to be generated on guest. | |
613 | */ | |
614 | #define EXP_GOLOMB_K 0 | |
615 | ||
616 | /** | |
617 | * @brief Exponential Golomb algorithm for arbitrary k (including k=0). | |
618 | * | |
619 | * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) | |
620 | * with growing length and with the mathematical property of being | |
621 | * "prefix-free". The latter means the generated prefixes can be prepended | |
622 | * in front of arbitrary numbers and the resulting concatenated numbers are | |
623 | * guaranteed to be always unique. | |
624 | * | |
625 | * This is a minor adjustment to the original Exp. Golomb algorithm in the | |
626 | * sense that lowest allowed index (@param n) starts with 1, not with zero. | |
627 | * | |
628 | * @param n - natural number (or index) of the prefix to be generated | |
629 | * (1, 2, 3, ...) | |
630 | * @param k - parameter k of Exp. Golomb algorithm to be used | |
631 | * (see comment on EXP_GOLOMB_K macro for details about k) | |
632 | */ | |
633 | static VariLenAffix expGolombEncode(uint64_t n, int k) | |
634 | { | |
635 | const uint64_t value = n + (1 << k) - 1; | |
636 | const int bits = (int) log2(value) + 1; | |
637 | return (VariLenAffix) { | |
638 | .type = AffixType_Prefix, | |
639 | .value = value, | |
640 | .bits = bits + MAX((bits - 1 - k), 0) | |
641 | }; | |
642 | } | |
643 | ||
644 | /** | |
645 | * @brief Converts a suffix into a prefix, or a prefix into a suffix. | |
646 | * | |
647 | * Simply mirror all bits of the affix value, for the purpose to preserve | |
648 | * respectively the mathematical "prefix-free" or "suffix-free" property | |
649 | * after the conversion. | |
650 | * | |
651 | * If a passed prefix is suitable to create unique numbers, then the | |
652 | * returned suffix is suitable to create unique numbers as well (and vice | |
653 | * versa). | |
654 | */ | |
655 | static VariLenAffix invertAffix(const VariLenAffix *affix) | |
656 | { | |
657 | return (VariLenAffix) { | |
658 | .type = | |
659 | (affix->type == AffixType_Suffix) ? | |
660 | AffixType_Prefix : AffixType_Suffix, | |
661 | .value = | |
662 | mirror64bit(affix->value) >> | |
663 | ((sizeof(affix->value) * 8) - affix->bits), | |
664 | .bits = affix->bits | |
665 | }; | |
666 | } | |
667 | ||
668 | /** | |
669 | * @brief Generates suffix numbers with "suffix-free" property. | |
670 | * | |
671 | * This is just a wrapper function on top of the Exp. Golomb algorithm. | |
672 | * | |
673 | * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, | |
674 | * this function converts the Exp. Golomb prefixes into appropriate suffixes | |
675 | * which are still suitable for generating unique numbers. | |
676 | * | |
677 | * @param n - natural number (or index) of the suffix to be generated | |
678 | * (1, 2, 3, ...) | |
679 | */ | |
680 | static VariLenAffix affixForIndex(uint64_t index) | |
681 | { | |
682 | VariLenAffix prefix; | |
683 | prefix = expGolombEncode(index, EXP_GOLOMB_K); | |
684 | return invertAffix(&prefix); /* convert prefix to suffix */ | |
685 | } | |
686 | ||
1a6ed33c AM |
687 | /* creative abuse of tb_hash_func7, which is based on xxhash */ |
688 | static uint32_t qpp_hash(QppEntry e) | |
689 | { | |
690 | return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); | |
691 | } | |
692 | ||
f3fe4a2d AM |
693 | static uint32_t qpf_hash(QpfEntry e) |
694 | { | |
695 | return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); | |
696 | } | |
697 | ||
6b6aa828 CS |
698 | static bool qpd_cmp_func(const void *obj, const void *userp) |
699 | { | |
700 | const QpdEntry *e1 = obj, *e2 = userp; | |
701 | return e1->dev == e2->dev; | |
702 | } | |
703 | ||
704 | static bool qpp_cmp_func(const void *obj, const void *userp) | |
1a6ed33c AM |
705 | { |
706 | const QppEntry *e1 = obj, *e2 = userp; | |
707 | return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; | |
708 | } | |
709 | ||
6b6aa828 | 710 | static bool qpf_cmp_func(const void *obj, const void *userp) |
f3fe4a2d AM |
711 | { |
712 | const QpfEntry *e1 = obj, *e2 = userp; | |
713 | return e1->dev == e2->dev && e1->ino == e2->ino; | |
714 | } | |
715 | ||
716 | static void qp_table_remove(void *p, uint32_t h, void *up) | |
1a6ed33c AM |
717 | { |
718 | g_free(p); | |
719 | } | |
720 | ||
f3fe4a2d | 721 | static void qp_table_destroy(struct qht *ht) |
1a6ed33c AM |
722 | { |
723 | if (!ht || !ht->map) { | |
724 | return; | |
725 | } | |
f3fe4a2d | 726 | qht_iter(ht, qp_table_remove, NULL); |
1a6ed33c AM |
727 | qht_destroy(ht); |
728 | } | |
729 | ||
6b6aa828 CS |
730 | static void qpd_table_init(struct qht *ht) |
731 | { | |
732 | qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); | |
733 | } | |
734 | ||
1a6ed33c AM |
735 | static void qpp_table_init(struct qht *ht) |
736 | { | |
6b6aa828 | 737 | qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); |
1a6ed33c AM |
738 | } |
739 | ||
f3fe4a2d AM |
740 | static void qpf_table_init(struct qht *ht) |
741 | { | |
6b6aa828 CS |
742 | qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); |
743 | } | |
744 | ||
745 | /* | |
746 | * Returns how many (high end) bits of inode numbers of the passed fs | |
747 | * device shall be used (in combination with the device number) to | |
748 | * generate hash values for qpp_table entries. | |
749 | * | |
750 | * This function is required if variable length suffixes are used for inode | |
751 | * number mapping on guest level. Since a device may end up having multiple | |
752 | * entries in qpp_table, each entry most probably with a different suffix | |
753 | * length, we thus need this function in conjunction with qpd_table to | |
754 | * "agree" about a fix amount of bits (per device) to be always used for | |
755 | * generating hash values for the purpose of accessing qpp_table in order | |
756 | * get consistent behaviour when accessing qpp_table. | |
757 | */ | |
758 | static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) | |
759 | { | |
760 | QpdEntry lookup = { | |
761 | .dev = dev | |
762 | }, *val; | |
763 | uint32_t hash = dev; | |
764 | VariLenAffix affix; | |
765 | ||
766 | val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); | |
767 | if (!val) { | |
768 | val = g_malloc0(sizeof(QpdEntry)); | |
769 | *val = lookup; | |
770 | affix = affixForIndex(pdu->s->qp_affix_next); | |
771 | val->prefix_bits = affix.bits; | |
772 | qht_insert(&pdu->s->qpd_table, val, hash, NULL); | |
773 | pdu->s->qp_ndevices++; | |
774 | } | |
775 | return val->prefix_bits; | |
f3fe4a2d AM |
776 | } |
777 | ||
6b6aa828 CS |
778 | /** |
779 | * @brief Slow / full mapping host inode nr -> guest inode nr. | |
780 | * | |
781 | * This function performs a slower and much more costly remapping of an | |
782 | * original file inode number on host to an appropriate different inode | |
783 | * number on guest. For every (dev, inode) combination on host a new | |
784 | * sequential number is generated, cached and exposed as inode number on | |
785 | * guest. | |
786 | * | |
787 | * This is just a "last resort" fallback solution if the much faster/cheaper | |
788 | * qid_path_suffixmap() failed. In practice this slow / full mapping is not | |
789 | * expected ever to be used at all though. | |
790 | * | |
791 | * @see qid_path_suffixmap() for details | |
792 | * | |
793 | */ | |
f3fe4a2d AM |
794 | static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, |
795 | uint64_t *path) | |
796 | { | |
797 | QpfEntry lookup = { | |
798 | .dev = stbuf->st_dev, | |
799 | .ino = stbuf->st_ino | |
800 | }, *val; | |
801 | uint32_t hash = qpf_hash(lookup); | |
6b6aa828 | 802 | VariLenAffix affix; |
f3fe4a2d AM |
803 | |
804 | val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); | |
805 | ||
806 | if (!val) { | |
807 | if (pdu->s->qp_fullpath_next == 0) { | |
808 | /* no more files can be mapped :'( */ | |
809 | error_report_once( | |
810 | "9p: No more prefixes available for remapping inodes from " | |
811 | "host to guest." | |
812 | ); | |
813 | return -ENFILE; | |
814 | } | |
815 | ||
816 | val = g_malloc0(sizeof(QppEntry)); | |
817 | *val = lookup; | |
818 | ||
819 | /* new unique inode and device combo */ | |
6b6aa828 CS |
820 | affix = affixForIndex( |
821 | 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) | |
822 | ); | |
823 | val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; | |
824 | pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); | |
f3fe4a2d AM |
825 | qht_insert(&pdu->s->qpf_table, val, hash, NULL); |
826 | } | |
827 | ||
828 | *path = val->path; | |
829 | return 0; | |
830 | } | |
831 | ||
6b6aa828 CS |
832 | /** |
833 | * @brief Quick mapping host inode nr -> guest inode nr. | |
1a6ed33c | 834 | * |
6b6aa828 CS |
835 | * This function performs quick remapping of an original file inode number |
836 | * on host to an appropriate different inode number on guest. This remapping | |
837 | * of inodes is required to avoid inode nr collisions on guest which would | |
838 | * happen if the 9p export contains more than 1 exported file system (or | |
839 | * more than 1 file system data set), because unlike on host level where the | |
840 | * files would have different device nrs, all files exported by 9p would | |
841 | * share the same device nr on guest (the device nr of the virtual 9p device | |
842 | * that is). | |
843 | * | |
844 | * Inode remapping is performed by chopping off high end bits of the original | |
845 | * inode number from host, shifting the result upwards and then assigning a | |
846 | * generated suffix number for the low end bits, where the same suffix number | |
847 | * will be shared by all inodes with the same device id AND the same high end | |
848 | * bits that have been chopped off. That approach utilizes the fact that inode | |
849 | * numbers very likely share the same high end bits (i.e. due to their common | |
850 | * sequential generation by file systems) and hence we only have to generate | |
851 | * and track a very limited amount of suffixes in practice due to that. | |
852 | * | |
853 | * We generate variable size suffixes for that purpose. The 1st generated | |
854 | * suffix will only have 1 bit and hence we only need to chop off 1 bit from | |
855 | * the original inode number. The subsequent suffixes being generated will | |
856 | * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being | |
857 | * generated will have 3 bits and hence we have to chop off 3 bits from their | |
858 | * original inodes, and so on. That approach of using variable length suffixes | |
859 | * (i.e. over fixed size ones) utilizes the fact that in practice only a very | |
860 | * limited amount of devices are shared by the same export (e.g. typically | |
861 | * less than 2 dozen devices per 9p export), so in practice we need to chop | |
862 | * off less bits than with fixed size prefixes and yet are flexible to add | |
863 | * new devices at runtime below host's export directory at any time without | |
864 | * having to reboot guest nor requiring to reconfigure guest for that. And due | |
865 | * to the very limited amount of original high end bits that we chop off that | |
866 | * way, the total amount of suffixes we need to generate is less than by using | |
867 | * fixed size prefixes and hence it also improves performance of the inode | |
868 | * remapping algorithm, and finally has the nice side effect that the inode | |
869 | * numbers on guest will be much smaller & human friendly. ;-) | |
1a6ed33c | 870 | */ |
6b6aa828 | 871 | static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, |
1a6ed33c AM |
872 | uint64_t *path) |
873 | { | |
6b6aa828 | 874 | const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); |
1a6ed33c AM |
875 | QppEntry lookup = { |
876 | .dev = stbuf->st_dev, | |
6b6aa828 | 877 | .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) |
1a6ed33c AM |
878 | }, *val; |
879 | uint32_t hash = qpp_hash(lookup); | |
880 | ||
881 | val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); | |
882 | ||
883 | if (!val) { | |
6b6aa828 CS |
884 | if (pdu->s->qp_affix_next == 0) { |
885 | /* we ran out of affixes */ | |
f3fe4a2d AM |
886 | warn_report_once( |
887 | "9p: Potential degraded performance of inode remapping" | |
1a6ed33c AM |
888 | ); |
889 | return -ENFILE; | |
890 | } | |
891 | ||
892 | val = g_malloc0(sizeof(QppEntry)); | |
893 | *val = lookup; | |
894 | ||
6b6aa828 CS |
895 | /* new unique inode affix and device combo */ |
896 | val->qp_affix_index = pdu->s->qp_affix_next++; | |
897 | val->qp_affix = affixForIndex(val->qp_affix_index); | |
1a6ed33c AM |
898 | qht_insert(&pdu->s->qpp_table, val, hash, NULL); |
899 | } | |
6b6aa828 CS |
900 | /* assuming generated affix to be suffix type, not prefix */ |
901 | *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; | |
1a6ed33c AM |
902 | return 0; |
903 | } | |
904 | ||
3b5ee9e8 | 905 | static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) |
286d5652 | 906 | { |
1a6ed33c | 907 | int err; |
286d5652 AL |
908 | size_t size; |
909 | ||
1a6ed33c AM |
910 | if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { |
911 | /* map inode+device to qid path (fast path) */ | |
6b6aa828 | 912 | err = qid_path_suffixmap(pdu, stbuf, &qidp->path); |
f3fe4a2d AM |
913 | if (err == -ENFILE) { |
914 | /* fast path didn't work, fall back to full map */ | |
915 | err = qid_path_fullmap(pdu, stbuf, &qidp->path); | |
916 | } | |
1a6ed33c AM |
917 | if (err) { |
918 | return err; | |
919 | } | |
920 | } else { | |
921 | if (pdu->s->dev_id != stbuf->st_dev) { | |
922 | if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { | |
923 | error_report_once( | |
924 | "9p: Multiple devices detected in same VirtFS export. " | |
925 | "Access of guest to additional devices is (partly) " | |
926 | "denied due to virtfs option 'multidevs=forbid' being " | |
927 | "effective." | |
928 | ); | |
929 | return -ENODEV; | |
930 | } else { | |
931 | warn_report_once( | |
932 | "9p: Multiple devices detected in same VirtFS export, " | |
933 | "which might lead to file ID collisions and severe " | |
934 | "misbehaviours on guest! You should either use a " | |
935 | "separate export for each device shared from host or " | |
936 | "use virtfs option 'multidevs=remap'!" | |
937 | ); | |
938 | } | |
939 | } | |
940 | memset(&qidp->path, 0, sizeof(qidp->path)); | |
941 | size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); | |
942 | memcpy(&qidp->path, &stbuf->st_ino, size); | |
3b5ee9e8 AM |
943 | } |
944 | ||
286d5652 AL |
945 | qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); |
946 | qidp->type = 0; | |
947 | if (S_ISDIR(stbuf->st_mode)) { | |
948 | qidp->type |= P9_QID_TYPE_DIR; | |
949 | } | |
950 | if (S_ISLNK(stbuf->st_mode)) { | |
951 | qidp->type |= P9_QID_TYPE_SYMLINK; | |
952 | } | |
3b5ee9e8 AM |
953 | |
954 | return 0; | |
286d5652 AL |
955 | } |
956 | ||
8440e22e GK |
957 | static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, |
958 | V9fsQID *qidp) | |
286d5652 AL |
959 | { |
960 | struct stat stbuf; | |
961 | int err; | |
962 | ||
bccacf6c | 963 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
8c158561 | 964 | if (err < 0) { |
286d5652 AL |
965 | return err; |
966 | } | |
3b5ee9e8 AM |
967 | err = stat_to_qid(pdu, &stbuf, qidp); |
968 | if (err < 0) { | |
969 | return err; | |
970 | } | |
286d5652 AL |
971 | return 0; |
972 | } | |
973 | ||
1a6ed33c AM |
974 | static int coroutine_fn dirent_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, |
975 | struct dirent *dent, V9fsQID *qidp) | |
976 | { | |
977 | struct stat stbuf; | |
978 | V9fsPath path; | |
979 | int err; | |
980 | ||
981 | v9fs_path_init(&path); | |
982 | ||
983 | err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); | |
984 | if (err < 0) { | |
985 | goto out; | |
986 | } | |
987 | err = v9fs_co_lstat(pdu, &path, &stbuf); | |
988 | if (err < 0) { | |
989 | goto out; | |
990 | } | |
991 | err = stat_to_qid(pdu, &stbuf, qidp); | |
992 | ||
993 | out: | |
994 | v9fs_path_free(&path); | |
995 | return err; | |
996 | } | |
997 | ||
4b311c5f | 998 | V9fsPDU *pdu_alloc(V9fsState *s) |
9f107513 AL |
999 | { |
1000 | V9fsPDU *pdu = NULL; | |
1001 | ||
1002 | if (!QLIST_EMPTY(&s->free_list)) { | |
bccacf6c AK |
1003 | pdu = QLIST_FIRST(&s->free_list); |
1004 | QLIST_REMOVE(pdu, next); | |
1005 | QLIST_INSERT_HEAD(&s->active_list, pdu, next); | |
9f107513 AL |
1006 | } |
1007 | return pdu; | |
1008 | } | |
1009 | ||
4b311c5f | 1010 | void pdu_free(V9fsPDU *pdu) |
9f107513 | 1011 | { |
6868a420 | 1012 | V9fsState *s = pdu->s; |
f74e27bf GK |
1013 | |
1014 | g_assert(!pdu->cancelled); | |
1015 | QLIST_REMOVE(pdu, next); | |
1016 | QLIST_INSERT_HEAD(&s->free_list, pdu, next); | |
9f107513 AL |
1017 | } |
1018 | ||
8440e22e | 1019 | static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) |
405a549a AL |
1020 | { |
1021 | int8_t id = pdu->id + 1; /* Response */ | |
ad38ce9e | 1022 | V9fsState *s = pdu->s; |
06a37db7 | 1023 | int ret; |
405a549a | 1024 | |
fc78d5ee KF |
1025 | /* |
1026 | * The 9p spec requires that successfully cancelled pdus receive no reply. | |
1027 | * Sending a reply would confuse clients because they would | |
1028 | * assume that any EINTR is the actual result of the operation, | |
1029 | * rather than a consequence of the cancellation. However, if | |
1030 | * the operation completed (succesfully or with an error other | |
1031 | * than caused be cancellation), we do send out that reply, both | |
1032 | * for efficiency and to avoid confusing the rest of the state machine | |
1033 | * that assumes passing a non-error here will mean a successful | |
1034 | * transmission of the reply. | |
1035 | */ | |
1036 | bool discard = pdu->cancelled && len == -EINTR; | |
1037 | if (discard) { | |
1038 | trace_v9fs_rcancel(pdu->tag, pdu->id); | |
1039 | pdu->size = 0; | |
1040 | goto out_notify; | |
1041 | } | |
1042 | ||
405a549a | 1043 | if (len < 0) { |
405a549a | 1044 | int err = -len; |
8f4d1ca5 | 1045 | len = 7; |
405a549a | 1046 | |
8f4d1ca5 AB |
1047 | if (s->proto_version != V9FS_PROTO_2000L) { |
1048 | V9fsString str; | |
1049 | ||
1050 | str.data = strerror(err); | |
1051 | str.size = strlen(str.data); | |
1052 | ||
06a37db7 GK |
1053 | ret = pdu_marshal(pdu, len, "s", &str); |
1054 | if (ret < 0) { | |
1055 | goto out_notify; | |
1056 | } | |
1057 | len += ret; | |
8f4d1ca5 AB |
1058 | id = P9_RERROR; |
1059 | } | |
405a549a | 1060 | |
06a37db7 GK |
1061 | ret = pdu_marshal(pdu, len, "d", err); |
1062 | if (ret < 0) { | |
1063 | goto out_notify; | |
1064 | } | |
1065 | len += ret; | |
405a549a | 1066 | |
8f4d1ca5 AB |
1067 | if (s->proto_version == V9FS_PROTO_2000L) { |
1068 | id = P9_RLERROR; | |
1069 | } | |
7999f7e1 | 1070 | trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ |
405a549a AL |
1071 | } |
1072 | ||
1073 | /* fill out the header */ | |
06a37db7 GK |
1074 | if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { |
1075 | goto out_notify; | |
1076 | } | |
405a549a AL |
1077 | |
1078 | /* keep these in sync */ | |
1079 | pdu->size = len; | |
1080 | pdu->id = id; | |
1081 | ||
06a37db7 | 1082 | out_notify: |
a17d8659 | 1083 | pdu->s->transport->push_and_notify(pdu); |
405a549a | 1084 | |
bccacf6c | 1085 | /* Now wakeup anybody waiting in flush for this request */ |
f74e27bf GK |
1086 | if (!qemu_co_queue_next(&pdu->complete)) { |
1087 | pdu_free(pdu); | |
1088 | } | |
405a549a AL |
1089 | } |
1090 | ||
bb9e3216 AL |
1091 | static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) |
1092 | { | |
1093 | mode_t ret; | |
1094 | ||
1095 | ret = mode & 0777; | |
1096 | if (mode & P9_STAT_MODE_DIR) { | |
1097 | ret |= S_IFDIR; | |
1098 | } | |
1099 | ||
cf03eb2c AB |
1100 | if (mode & P9_STAT_MODE_SYMLINK) { |
1101 | ret |= S_IFLNK; | |
1102 | } | |
1103 | if (mode & P9_STAT_MODE_SOCKET) { | |
1104 | ret |= S_IFSOCK; | |
1105 | } | |
1106 | if (mode & P9_STAT_MODE_NAMED_PIPE) { | |
1107 | ret |= S_IFIFO; | |
1108 | } | |
1109 | if (mode & P9_STAT_MODE_DEVICE) { | |
c7e587b7 | 1110 | if (extension->size && extension->data[0] == 'c') { |
cf03eb2c AB |
1111 | ret |= S_IFCHR; |
1112 | } else { | |
1113 | ret |= S_IFBLK; | |
bb9e3216 AL |
1114 | } |
1115 | } | |
1116 | ||
1117 | if (!(ret&~0777)) { | |
1118 | ret |= S_IFREG; | |
1119 | } | |
1120 | ||
1121 | if (mode & P9_STAT_MODE_SETUID) { | |
1122 | ret |= S_ISUID; | |
1123 | } | |
1124 | if (mode & P9_STAT_MODE_SETGID) { | |
1125 | ret |= S_ISGID; | |
1126 | } | |
1127 | if (mode & P9_STAT_MODE_SETVTX) { | |
1128 | ret |= S_ISVTX; | |
1129 | } | |
1130 | ||
1131 | return ret; | |
1132 | } | |
1133 | ||
1134 | static int donttouch_stat(V9fsStat *stat) | |
1135 | { | |
1136 | if (stat->type == -1 && | |
1137 | stat->dev == -1 && | |
87032833 AM |
1138 | stat->qid.type == 0xff && |
1139 | stat->qid.version == (uint32_t) -1 && | |
1140 | stat->qid.path == (uint64_t) -1 && | |
bb9e3216 AL |
1141 | stat->mode == -1 && |
1142 | stat->atime == -1 && | |
1143 | stat->mtime == -1 && | |
1144 | stat->length == -1 && | |
1145 | !stat->name.size && | |
1146 | !stat->uid.size && | |
1147 | !stat->gid.size && | |
1148 | !stat->muid.size && | |
1149 | stat->n_uid == -1 && | |
1150 | stat->n_gid == -1 && | |
1151 | stat->n_muid == -1) { | |
1152 | return 1; | |
1153 | } | |
1154 | ||
1155 | return 0; | |
1156 | } | |
1157 | ||
ddca7f86 MK |
1158 | static void v9fs_stat_init(V9fsStat *stat) |
1159 | { | |
1160 | v9fs_string_init(&stat->name); | |
1161 | v9fs_string_init(&stat->uid); | |
1162 | v9fs_string_init(&stat->gid); | |
1163 | v9fs_string_init(&stat->muid); | |
1164 | v9fs_string_init(&stat->extension); | |
1165 | } | |
1166 | ||
bb9e3216 AL |
1167 | static void v9fs_stat_free(V9fsStat *stat) |
1168 | { | |
1169 | v9fs_string_free(&stat->name); | |
1170 | v9fs_string_free(&stat->uid); | |
1171 | v9fs_string_free(&stat->gid); | |
1172 | v9fs_string_free(&stat->muid); | |
1173 | v9fs_string_free(&stat->extension); | |
1174 | } | |
1175 | ||
1176 | static uint32_t stat_to_v9mode(const struct stat *stbuf) | |
1177 | { | |
1178 | uint32_t mode; | |
1179 | ||
1180 | mode = stbuf->st_mode & 0777; | |
1181 | if (S_ISDIR(stbuf->st_mode)) { | |
1182 | mode |= P9_STAT_MODE_DIR; | |
1183 | } | |
1184 | ||
cf03eb2c AB |
1185 | if (S_ISLNK(stbuf->st_mode)) { |
1186 | mode |= P9_STAT_MODE_SYMLINK; | |
1187 | } | |
bb9e3216 | 1188 | |
cf03eb2c AB |
1189 | if (S_ISSOCK(stbuf->st_mode)) { |
1190 | mode |= P9_STAT_MODE_SOCKET; | |
1191 | } | |
bb9e3216 | 1192 | |
cf03eb2c AB |
1193 | if (S_ISFIFO(stbuf->st_mode)) { |
1194 | mode |= P9_STAT_MODE_NAMED_PIPE; | |
1195 | } | |
bb9e3216 | 1196 | |
cf03eb2c AB |
1197 | if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { |
1198 | mode |= P9_STAT_MODE_DEVICE; | |
1199 | } | |
bb9e3216 | 1200 | |
cf03eb2c AB |
1201 | if (stbuf->st_mode & S_ISUID) { |
1202 | mode |= P9_STAT_MODE_SETUID; | |
1203 | } | |
bb9e3216 | 1204 | |
cf03eb2c AB |
1205 | if (stbuf->st_mode & S_ISGID) { |
1206 | mode |= P9_STAT_MODE_SETGID; | |
1207 | } | |
bb9e3216 | 1208 | |
cf03eb2c AB |
1209 | if (stbuf->st_mode & S_ISVTX) { |
1210 | mode |= P9_STAT_MODE_SETVTX; | |
bb9e3216 AL |
1211 | } |
1212 | ||
1213 | return mode; | |
1214 | } | |
1215 | ||
6069537f JD |
1216 | static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, |
1217 | const char *basename, | |
8440e22e GK |
1218 | const struct stat *stbuf, |
1219 | V9fsStat *v9stat) | |
bb9e3216 AL |
1220 | { |
1221 | int err; | |
bb9e3216 AL |
1222 | |
1223 | memset(v9stat, 0, sizeof(*v9stat)); | |
1224 | ||
3b5ee9e8 AM |
1225 | err = stat_to_qid(pdu, stbuf, &v9stat->qid); |
1226 | if (err < 0) { | |
1227 | return err; | |
1228 | } | |
bb9e3216 AL |
1229 | v9stat->mode = stat_to_v9mode(stbuf); |
1230 | v9stat->atime = stbuf->st_atime; | |
1231 | v9stat->mtime = stbuf->st_mtime; | |
1232 | v9stat->length = stbuf->st_size; | |
1233 | ||
abdf0086 GK |
1234 | v9fs_string_free(&v9stat->uid); |
1235 | v9fs_string_free(&v9stat->gid); | |
1236 | v9fs_string_free(&v9stat->muid); | |
bb9e3216 | 1237 | |
cf03eb2c AB |
1238 | v9stat->n_uid = stbuf->st_uid; |
1239 | v9stat->n_gid = stbuf->st_gid; | |
1240 | v9stat->n_muid = 0; | |
bb9e3216 | 1241 | |
abdf0086 | 1242 | v9fs_string_free(&v9stat->extension); |
bb9e3216 | 1243 | |
cf03eb2c | 1244 | if (v9stat->mode & P9_STAT_MODE_SYMLINK) { |
6069537f | 1245 | err = v9fs_co_readlink(pdu, path, &v9stat->extension); |
7a5ca31e | 1246 | if (err < 0) { |
cf03eb2c | 1247 | return err; |
bb9e3216 | 1248 | } |
cf03eb2c AB |
1249 | } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { |
1250 | v9fs_string_sprintf(&v9stat->extension, "%c %u %u", | |
1251 | S_ISCHR(stbuf->st_mode) ? 'c' : 'b', | |
1252 | major(stbuf->st_rdev), minor(stbuf->st_rdev)); | |
1253 | } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { | |
c9ba47dc SW |
1254 | v9fs_string_sprintf(&v9stat->extension, "%s %lu", |
1255 | "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); | |
bb9e3216 AL |
1256 | } |
1257 | ||
6069537f | 1258 | v9fs_string_sprintf(&v9stat->name, "%s", basename); |
bb9e3216 AL |
1259 | |
1260 | v9stat->size = 61 + | |
1261 | v9fs_string_size(&v9stat->name) + | |
1262 | v9fs_string_size(&v9stat->uid) + | |
1263 | v9fs_string_size(&v9stat->gid) + | |
1264 | v9fs_string_size(&v9stat->muid) + | |
1265 | v9fs_string_size(&v9stat->extension); | |
1266 | return 0; | |
1267 | } | |
1268 | ||
00ede4c2 SK |
1269 | #define P9_STATS_MODE 0x00000001ULL |
1270 | #define P9_STATS_NLINK 0x00000002ULL | |
1271 | #define P9_STATS_UID 0x00000004ULL | |
1272 | #define P9_STATS_GID 0x00000008ULL | |
1273 | #define P9_STATS_RDEV 0x00000010ULL | |
1274 | #define P9_STATS_ATIME 0x00000020ULL | |
1275 | #define P9_STATS_MTIME 0x00000040ULL | |
1276 | #define P9_STATS_CTIME 0x00000080ULL | |
1277 | #define P9_STATS_INO 0x00000100ULL | |
1278 | #define P9_STATS_SIZE 0x00000200ULL | |
1279 | #define P9_STATS_BLOCKS 0x00000400ULL | |
1280 | ||
1281 | #define P9_STATS_BTIME 0x00000800ULL | |
1282 | #define P9_STATS_GEN 0x00001000ULL | |
1283 | #define P9_STATS_DATA_VERSION 0x00002000ULL | |
1284 | ||
1285 | #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ | |
1286 | #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ | |
1287 | ||
1288 | ||
3b5ee9e8 | 1289 | static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, |
8db21ce7 | 1290 | V9fsStatDotl *v9lstat) |
00ede4c2 SK |
1291 | { |
1292 | memset(v9lstat, 0, sizeof(*v9lstat)); | |
1293 | ||
1294 | v9lstat->st_mode = stbuf->st_mode; | |
1295 | v9lstat->st_nlink = stbuf->st_nlink; | |
1296 | v9lstat->st_uid = stbuf->st_uid; | |
1297 | v9lstat->st_gid = stbuf->st_gid; | |
1298 | v9lstat->st_rdev = stbuf->st_rdev; | |
1299 | v9lstat->st_size = stbuf->st_size; | |
1300 | v9lstat->st_blksize = stbuf->st_blksize; | |
1301 | v9lstat->st_blocks = stbuf->st_blocks; | |
1302 | v9lstat->st_atime_sec = stbuf->st_atime; | |
1303 | v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; | |
1304 | v9lstat->st_mtime_sec = stbuf->st_mtime; | |
1305 | v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; | |
1306 | v9lstat->st_ctime_sec = stbuf->st_ctime; | |
1307 | v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; | |
1308 | /* Currently we only support BASIC fields in stat */ | |
1309 | v9lstat->st_result_mask = P9_STATS_BASIC; | |
1310 | ||
3b5ee9e8 | 1311 | return stat_to_qid(pdu, stbuf, &v9lstat->qid); |
00ede4c2 SK |
1312 | } |
1313 | ||
1f5a89bf AL |
1314 | static void print_sg(struct iovec *sg, int cnt) |
1315 | { | |
1316 | int i; | |
1317 | ||
1318 | printf("sg[%d]: {", cnt); | |
1319 | for (i = 0; i < cnt; i++) { | |
1320 | if (i) { | |
1321 | printf(", "); | |
1322 | } | |
1323 | printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); | |
1324 | } | |
1325 | printf("}\n"); | |
1326 | } | |
1327 | ||
2289be19 AK |
1328 | /* Will call this only for path name based fid */ |
1329 | static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) | |
8cf89e00 | 1330 | { |
2289be19 AK |
1331 | V9fsPath str; |
1332 | v9fs_path_init(&str); | |
1333 | v9fs_path_copy(&str, dst); | |
e3e83f2e | 1334 | v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); |
2289be19 | 1335 | v9fs_path_free(&str); |
8cf89e00 AL |
1336 | } |
1337 | ||
2c74c2cb MK |
1338 | static inline bool is_ro_export(FsContext *ctx) |
1339 | { | |
1340 | return ctx->export_flags & V9FS_RDONLY; | |
1341 | } | |
1342 | ||
8440e22e | 1343 | static void coroutine_fn v9fs_version(void *opaque) |
9f107513 | 1344 | { |
ddca7f86 | 1345 | ssize_t err; |
ff06030f VJ |
1346 | V9fsPDU *pdu = opaque; |
1347 | V9fsState *s = pdu->s; | |
92c1ad03 AL |
1348 | V9fsString version; |
1349 | size_t offset = 7; | |
1350 | ||
ddca7f86 MK |
1351 | v9fs_string_init(&version); |
1352 | err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); | |
1353 | if (err < 0) { | |
ddca7f86 MK |
1354 | goto out; |
1355 | } | |
c572f23a | 1356 | trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); |
92c1ad03 | 1357 | |
b41e2992 DS |
1358 | virtfs_reset(pdu); |
1359 | ||
84151514 MK |
1360 | if (!strcmp(version.data, "9P2000.u")) { |
1361 | s->proto_version = V9FS_PROTO_2000U; | |
1362 | } else if (!strcmp(version.data, "9P2000.L")) { | |
1363 | s->proto_version = V9FS_PROTO_2000L; | |
1364 | } else { | |
92c1ad03 | 1365 | v9fs_string_sprintf(&version, "unknown"); |
e16453a3 CS |
1366 | /* skip min. msize check, reporting invalid version has priority */ |
1367 | goto marshal; | |
9f107513 | 1368 | } |
92c1ad03 | 1369 | |
e16453a3 CS |
1370 | if (s->msize < P9_MIN_MSIZE) { |
1371 | err = -EMSGSIZE; | |
1372 | error_report( | |
1373 | "9pfs: Client requested msize < minimum msize (" | |
1374 | stringify(P9_MIN_MSIZE) ") supported by this server." | |
1375 | ); | |
1376 | goto out; | |
1377 | } | |
1378 | ||
1379 | marshal: | |
ddca7f86 MK |
1380 | err = pdu_marshal(pdu, offset, "ds", s->msize, &version); |
1381 | if (err < 0) { | |
ddca7f86 MK |
1382 | goto out; |
1383 | } | |
403a905b | 1384 | err += offset; |
c572f23a | 1385 | trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); |
ddca7f86 | 1386 | out: |
403a905b | 1387 | pdu_complete(pdu, err); |
92c1ad03 | 1388 | v9fs_string_free(&version); |
9f107513 AL |
1389 | } |
1390 | ||
8440e22e | 1391 | static void coroutine_fn v9fs_attach(void *opaque) |
9f107513 | 1392 | { |
ff06030f VJ |
1393 | V9fsPDU *pdu = opaque; |
1394 | V9fsState *s = pdu->s; | |
955efc47 AL |
1395 | int32_t fid, afid, n_uname; |
1396 | V9fsString uname, aname; | |
1397 | V9fsFidState *fidp; | |
955efc47 | 1398 | size_t offset = 7; |
8c158561 | 1399 | V9fsQID qid; |
955efc47 | 1400 | ssize_t err; |
fe44dc91 | 1401 | Error *local_err = NULL; |
955efc47 | 1402 | |
ddca7f86 MK |
1403 | v9fs_string_init(&uname); |
1404 | v9fs_string_init(&aname); | |
1405 | err = pdu_unmarshal(pdu, offset, "ddssd", &fid, | |
1406 | &afid, &uname, &aname, &n_uname); | |
1407 | if (err < 0) { | |
1408 | goto out_nofid; | |
1409 | } | |
c572f23a | 1410 | trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); |
955efc47 AL |
1411 | |
1412 | fidp = alloc_fid(s, fid); | |
1413 | if (fidp == NULL) { | |
1414 | err = -EINVAL; | |
84dfb926 | 1415 | goto out_nofid; |
9f107513 | 1416 | } |
955efc47 | 1417 | fidp->uid = n_uname; |
bccacf6c | 1418 | err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); |
2289be19 AK |
1419 | if (err < 0) { |
1420 | err = -EINVAL; | |
1421 | clunk_fid(s, fid); | |
1422 | goto out; | |
1423 | } | |
bccacf6c | 1424 | err = fid_to_qid(pdu, fidp, &qid); |
8c158561 | 1425 | if (err < 0) { |
955efc47 | 1426 | err = -EINVAL; |
84dfb926 | 1427 | clunk_fid(s, fid); |
955efc47 AL |
1428 | goto out; |
1429 | } | |
fe44dc91 | 1430 | |
4cdc0789 AK |
1431 | /* |
1432 | * disable migration if we haven't done already. | |
1433 | * attach could get called multiple times for the same export. | |
1434 | */ | |
1435 | if (!s->migration_blocker) { | |
f231b88d CR |
1436 | error_setg(&s->migration_blocker, |
1437 | "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", | |
1438 | s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); | |
fe44dc91 AA |
1439 | err = migrate_add_blocker(s->migration_blocker, &local_err); |
1440 | if (local_err) { | |
1441 | error_free(local_err); | |
1442 | error_free(s->migration_blocker); | |
1443 | s->migration_blocker = NULL; | |
1444 | clunk_fid(s, fid); | |
1445 | goto out; | |
1446 | } | |
1447 | s->root_fid = fid; | |
1448 | } | |
1449 | ||
1450 | err = pdu_marshal(pdu, offset, "Q", &qid); | |
1451 | if (err < 0) { | |
1452 | clunk_fid(s, fid); | |
1453 | goto out; | |
4cdc0789 | 1454 | } |
fe44dc91 AA |
1455 | err += offset; |
1456 | ||
1457 | memcpy(&s->root_qid, &qid, sizeof(qid)); | |
1458 | trace_v9fs_attach_return(pdu->tag, pdu->id, | |
1459 | qid.type, qid.version, qid.path); | |
955efc47 | 1460 | out: |
bccacf6c | 1461 | put_fid(pdu, fidp); |
84dfb926 | 1462 | out_nofid: |
dc295f83 | 1463 | pdu_complete(pdu, err); |
955efc47 AL |
1464 | v9fs_string_free(&uname); |
1465 | v9fs_string_free(&aname); | |
9f107513 AL |
1466 | } |
1467 | ||
8440e22e | 1468 | static void coroutine_fn v9fs_stat(void *opaque) |
9f107513 | 1469 | { |
4da7d3fa | 1470 | int32_t fid; |
d8e0c29e | 1471 | V9fsStat v9stat; |
4da7d3fa | 1472 | ssize_t err = 0; |
d8e0c29e AK |
1473 | size_t offset = 7; |
1474 | struct stat stbuf; | |
1475 | V9fsFidState *fidp; | |
1476 | V9fsPDU *pdu = opaque; | |
6069537f | 1477 | char *basename; |
4da7d3fa | 1478 | |
ddca7f86 MK |
1479 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
1480 | if (err < 0) { | |
1481 | goto out_nofid; | |
1482 | } | |
c572f23a | 1483 | trace_v9fs_stat(pdu->tag, pdu->id, fid); |
84dfb926 | 1484 | |
bccacf6c | 1485 | fidp = get_fid(pdu, fid); |
d8e0c29e | 1486 | if (fidp == NULL) { |
4da7d3fa | 1487 | err = -ENOENT; |
84dfb926 | 1488 | goto out_nofid; |
9f107513 | 1489 | } |
bccacf6c | 1490 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
d8e0c29e AK |
1491 | if (err < 0) { |
1492 | goto out; | |
1493 | } | |
6069537f JD |
1494 | basename = g_path_get_basename(fidp->path.data); |
1495 | err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); | |
1496 | g_free(basename); | |
d8e0c29e AK |
1497 | if (err < 0) { |
1498 | goto out; | |
1499 | } | |
ddca7f86 MK |
1500 | err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); |
1501 | if (err < 0) { | |
1502 | v9fs_stat_free(&v9stat); | |
1503 | goto out; | |
1504 | } | |
7999f7e1 AK |
1505 | trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, |
1506 | v9stat.atime, v9stat.mtime, v9stat.length); | |
ddca7f86 | 1507 | err += offset; |
d8e0c29e | 1508 | v9fs_stat_free(&v9stat); |
4da7d3fa | 1509 | out: |
bccacf6c | 1510 | put_fid(pdu, fidp); |
84dfb926 | 1511 | out_nofid: |
dc295f83 | 1512 | pdu_complete(pdu, err); |
9f107513 AL |
1513 | } |
1514 | ||
8440e22e | 1515 | static void coroutine_fn v9fs_getattr(void *opaque) |
00ede4c2 SK |
1516 | { |
1517 | int32_t fid; | |
8db21ce7 AK |
1518 | size_t offset = 7; |
1519 | ssize_t retval = 0; | |
1520 | struct stat stbuf; | |
00ede4c2 SK |
1521 | V9fsFidState *fidp; |
1522 | uint64_t request_mask; | |
8db21ce7 AK |
1523 | V9fsStatDotl v9stat_dotl; |
1524 | V9fsPDU *pdu = opaque; | |
00ede4c2 | 1525 | |
ddca7f86 MK |
1526 | retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); |
1527 | if (retval < 0) { | |
1528 | goto out_nofid; | |
1529 | } | |
c572f23a | 1530 | trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); |
00ede4c2 | 1531 | |
bccacf6c | 1532 | fidp = get_fid(pdu, fid); |
00ede4c2 | 1533 | if (fidp == NULL) { |
8db21ce7 | 1534 | retval = -ENOENT; |
84dfb926 | 1535 | goto out_nofid; |
00ede4c2 | 1536 | } |
8db21ce7 AK |
1537 | /* |
1538 | * Currently we only support BASIC fields in stat, so there is no | |
00ede4c2 SK |
1539 | * need to look at request_mask. |
1540 | */ | |
bccacf6c | 1541 | retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
8db21ce7 AK |
1542 | if (retval < 0) { |
1543 | goto out; | |
1544 | } | |
3b5ee9e8 AM |
1545 | retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); |
1546 | if (retval < 0) { | |
1547 | goto out; | |
1548 | } | |
e06a765e HPB |
1549 | |
1550 | /* fill st_gen if requested and supported by underlying fs */ | |
1551 | if (request_mask & P9_STATS_GEN) { | |
1552 | retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); | |
f8b7ee38 KS |
1553 | switch (retval) { |
1554 | case 0: | |
1555 | /* we have valid st_gen: update result mask */ | |
1556 | v9stat_dotl.st_result_mask |= P9_STATS_GEN; | |
1557 | break; | |
1558 | case -EINTR: | |
1559 | /* request cancelled, e.g. by Tflush */ | |
e06a765e | 1560 | goto out; |
f8b7ee38 KS |
1561 | default: |
1562 | /* failed to get st_gen: not fatal, ignore */ | |
1563 | break; | |
e06a765e | 1564 | } |
e06a765e | 1565 | } |
ddca7f86 MK |
1566 | retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); |
1567 | if (retval < 0) { | |
1568 | goto out; | |
1569 | } | |
1570 | retval += offset; | |
c572f23a HPB |
1571 | trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, |
1572 | v9stat_dotl.st_mode, v9stat_dotl.st_uid, | |
1573 | v9stat_dotl.st_gid); | |
7999f7e1 AK |
1574 | out: |
1575 | put_fid(pdu, fidp); | |
1576 | out_nofid: | |
dc295f83 | 1577 | pdu_complete(pdu, retval); |
00ede4c2 SK |
1578 | } |
1579 | ||
e4027caf AK |
1580 | /* Attribute flags */ |
1581 | #define P9_ATTR_MODE (1 << 0) | |
1582 | #define P9_ATTR_UID (1 << 1) | |
1583 | #define P9_ATTR_GID (1 << 2) | |
1584 | #define P9_ATTR_SIZE (1 << 3) | |
1585 | #define P9_ATTR_ATIME (1 << 4) | |
1586 | #define P9_ATTR_MTIME (1 << 5) | |
1587 | #define P9_ATTR_CTIME (1 << 6) | |
1588 | #define P9_ATTR_ATIME_SET (1 << 7) | |
1589 | #define P9_ATTR_MTIME_SET (1 << 8) | |
1590 | ||
1591 | #define P9_ATTR_MASK 127 | |
c79ce737 | 1592 | |
8440e22e | 1593 | static void coroutine_fn v9fs_setattr(void *opaque) |
c79ce737 | 1594 | { |
65c05f9a AK |
1595 | int err = 0; |
1596 | int32_t fid; | |
1597 | V9fsFidState *fidp; | |
1598 | size_t offset = 7; | |
1599 | V9fsIattr v9iattr; | |
1600 | V9fsPDU *pdu = opaque; | |
c79ce737 | 1601 | |
ddca7f86 MK |
1602 | err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); |
1603 | if (err < 0) { | |
1604 | goto out_nofid; | |
1605 | } | |
c79ce737 | 1606 | |
8f9c64bf GK |
1607 | trace_v9fs_setattr(pdu->tag, pdu->id, fid, |
1608 | v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, | |
1609 | v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); | |
1610 | ||
bccacf6c | 1611 | fidp = get_fid(pdu, fid); |
65c05f9a AK |
1612 | if (fidp == NULL) { |
1613 | err = -EINVAL; | |
84dfb926 | 1614 | goto out_nofid; |
c79ce737 | 1615 | } |
e4027caf | 1616 | if (v9iattr.valid & P9_ATTR_MODE) { |
bccacf6c | 1617 | err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); |
65c05f9a AK |
1618 | if (err < 0) { |
1619 | goto out; | |
c79ce737 | 1620 | } |
c79ce737 | 1621 | } |
e4027caf | 1622 | if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { |
c79ce737 | 1623 | struct timespec times[2]; |
e4027caf AK |
1624 | if (v9iattr.valid & P9_ATTR_ATIME) { |
1625 | if (v9iattr.valid & P9_ATTR_ATIME_SET) { | |
65c05f9a AK |
1626 | times[0].tv_sec = v9iattr.atime_sec; |
1627 | times[0].tv_nsec = v9iattr.atime_nsec; | |
c79ce737 SK |
1628 | } else { |
1629 | times[0].tv_nsec = UTIME_NOW; | |
1630 | } | |
1631 | } else { | |
1632 | times[0].tv_nsec = UTIME_OMIT; | |
1633 | } | |
e4027caf AK |
1634 | if (v9iattr.valid & P9_ATTR_MTIME) { |
1635 | if (v9iattr.valid & P9_ATTR_MTIME_SET) { | |
65c05f9a AK |
1636 | times[1].tv_sec = v9iattr.mtime_sec; |
1637 | times[1].tv_nsec = v9iattr.mtime_nsec; | |
c79ce737 SK |
1638 | } else { |
1639 | times[1].tv_nsec = UTIME_NOW; | |
1640 | } | |
1641 | } else { | |
1642 | times[1].tv_nsec = UTIME_OMIT; | |
1643 | } | |
bccacf6c | 1644 | err = v9fs_co_utimensat(pdu, &fidp->path, times); |
65c05f9a AK |
1645 | if (err < 0) { |
1646 | goto out; | |
1647 | } | |
c79ce737 | 1648 | } |
65c05f9a AK |
1649 | /* |
1650 | * If the only valid entry in iattr is ctime we can call | |
1651 | * chown(-1,-1) to update the ctime of the file | |
1652 | */ | |
e4027caf AK |
1653 | if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || |
1654 | ((v9iattr.valid & P9_ATTR_CTIME) | |
1655 | && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { | |
1656 | if (!(v9iattr.valid & P9_ATTR_UID)) { | |
65c05f9a AK |
1657 | v9iattr.uid = -1; |
1658 | } | |
e4027caf | 1659 | if (!(v9iattr.valid & P9_ATTR_GID)) { |
65c05f9a AK |
1660 | v9iattr.gid = -1; |
1661 | } | |
bccacf6c | 1662 | err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, |
65c05f9a AK |
1663 | v9iattr.gid); |
1664 | if (err < 0) { | |
1665 | goto out; | |
1666 | } | |
c79ce737 | 1667 | } |
e4027caf | 1668 | if (v9iattr.valid & (P9_ATTR_SIZE)) { |
bccacf6c | 1669 | err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); |
65c05f9a AK |
1670 | if (err < 0) { |
1671 | goto out; | |
1672 | } | |
c79ce737 | 1673 | } |
65c05f9a | 1674 | err = offset; |
8f9c64bf | 1675 | trace_v9fs_setattr_return(pdu->tag, pdu->id); |
c79ce737 | 1676 | out: |
bccacf6c | 1677 | put_fid(pdu, fidp); |
84dfb926 | 1678 | out_nofid: |
dc295f83 | 1679 | pdu_complete(pdu, err); |
c79ce737 SK |
1680 | } |
1681 | ||
3cc19c0c | 1682 | static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) |
ff5e54c9 AL |
1683 | { |
1684 | int i; | |
ddca7f86 | 1685 | ssize_t err; |
3cc19c0c | 1686 | size_t offset = 7; |
ddca7f86 MK |
1687 | |
1688 | err = pdu_marshal(pdu, offset, "w", nwnames); | |
1689 | if (err < 0) { | |
1690 | return err; | |
1691 | } | |
1692 | offset += err; | |
3cc19c0c | 1693 | for (i = 0; i < nwnames; i++) { |
ddca7f86 MK |
1694 | err = pdu_marshal(pdu, offset, "Q", &qids[i]); |
1695 | if (err < 0) { | |
1696 | return err; | |
1697 | } | |
1698 | offset += err; | |
ff5e54c9 | 1699 | } |
3cc19c0c | 1700 | return offset; |
ff5e54c9 AL |
1701 | } |
1702 | ||
fff39a7a GK |
1703 | static bool name_is_illegal(const char *name) |
1704 | { | |
1705 | return !*name || strchr(name, '/') != NULL; | |
1706 | } | |
1707 | ||
56f101ec GK |
1708 | static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2) |
1709 | { | |
1710 | return | |
1711 | qid1->type != qid2->type || | |
1712 | qid1->version != qid2->version || | |
1713 | qid1->path != qid2->path; | |
1714 | } | |
1715 | ||
8440e22e | 1716 | static void coroutine_fn v9fs_walk(void *opaque) |
9f107513 | 1717 | { |
3cc19c0c AK |
1718 | int name_idx; |
1719 | V9fsQID *qids = NULL; | |
1720 | int i, err = 0; | |
2289be19 | 1721 | V9fsPath dpath, path; |
3cc19c0c AK |
1722 | uint16_t nwnames; |
1723 | struct stat stbuf; | |
1724 | size_t offset = 7; | |
1725 | int32_t fid, newfid; | |
1726 | V9fsString *wnames = NULL; | |
1727 | V9fsFidState *fidp; | |
3a93113a | 1728 | V9fsFidState *newfidp = NULL; |
ff06030f VJ |
1729 | V9fsPDU *pdu = opaque; |
1730 | V9fsState *s = pdu->s; | |
56f101ec | 1731 | V9fsQID qid; |
ff5e54c9 | 1732 | |
ddca7f86 MK |
1733 | err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); |
1734 | if (err < 0) { | |
dc295f83 | 1735 | pdu_complete(pdu, err); |
ddca7f86 MK |
1736 | return ; |
1737 | } | |
1738 | offset += err; | |
ff5e54c9 | 1739 | |
c572f23a HPB |
1740 | trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); |
1741 | ||
3cc19c0c | 1742 | if (nwnames && nwnames <= P9_MAXWELEM) { |
1923923b GK |
1743 | wnames = g_new0(V9fsString, nwnames); |
1744 | qids = g_new0(V9fsQID, nwnames); | |
3cc19c0c | 1745 | for (i = 0; i < nwnames; i++) { |
ddca7f86 MK |
1746 | err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); |
1747 | if (err < 0) { | |
1748 | goto out_nofid; | |
1749 | } | |
fff39a7a GK |
1750 | if (name_is_illegal(wnames[i].data)) { |
1751 | err = -ENOENT; | |
1752 | goto out_nofid; | |
1753 | } | |
ddca7f86 | 1754 | offset += err; |
ff5e54c9 | 1755 | } |
3cc19c0c | 1756 | } else if (nwnames > P9_MAXWELEM) { |
4f8dee2d | 1757 | err = -EINVAL; |
84dfb926 | 1758 | goto out_nofid; |
ff5e54c9 | 1759 | } |
bccacf6c | 1760 | fidp = get_fid(pdu, fid); |
3cc19c0c | 1761 | if (fidp == NULL) { |
ff5e54c9 | 1762 | err = -ENOENT; |
84dfb926 | 1763 | goto out_nofid; |
ff5e54c9 | 1764 | } |
56f101ec | 1765 | |
13fd08e6 GK |
1766 | v9fs_path_init(&dpath); |
1767 | v9fs_path_init(&path); | |
1768 | ||
56f101ec GK |
1769 | err = fid_to_qid(pdu, fidp, &qid); |
1770 | if (err < 0) { | |
1771 | goto out; | |
1772 | } | |
1773 | ||
2289be19 AK |
1774 | /* |
1775 | * Both dpath and path initially poin to fidp. | |
1776 | * Needed to handle request with nwnames == 0 | |
1777 | */ | |
1778 | v9fs_path_copy(&dpath, &fidp->path); | |
1779 | v9fs_path_copy(&path, &fidp->path); | |
1780 | for (name_idx = 0; name_idx < nwnames; name_idx++) { | |
56f101ec GK |
1781 | if (not_same_qid(&pdu->s->root_qid, &qid) || |
1782 | strcmp("..", wnames[name_idx].data)) { | |
1783 | err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, | |
1784 | &path); | |
1785 | if (err < 0) { | |
1786 | goto out; | |
1787 | } | |
1788 | ||
1789 | err = v9fs_co_lstat(pdu, &path, &stbuf); | |
1790 | if (err < 0) { | |
1791 | goto out; | |
1792 | } | |
3b5ee9e8 AM |
1793 | err = stat_to_qid(pdu, &stbuf, &qid); |
1794 | if (err < 0) { | |
1795 | goto out; | |
1796 | } | |
56f101ec | 1797 | v9fs_path_copy(&dpath, &path); |
2289be19 | 1798 | } |
56f101ec | 1799 | memcpy(&qids[name_idx], &qid, sizeof(qid)); |
2289be19 | 1800 | } |
ff5e54c9 | 1801 | if (fid == newfid) { |
49dd946b GK |
1802 | if (fidp->fid_type != P9_FID_NONE) { |
1803 | err = -EINVAL; | |
1804 | goto out; | |
1805 | } | |
5b3c77aa | 1806 | v9fs_path_write_lock(s); |
2289be19 | 1807 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 1808 | v9fs_path_unlock(s); |
ff5e54c9 | 1809 | } else { |
3cc19c0c AK |
1810 | newfidp = alloc_fid(s, newfid); |
1811 | if (newfidp == NULL) { | |
ff5e54c9 AL |
1812 | err = -EINVAL; |
1813 | goto out; | |
1814 | } | |
3cc19c0c | 1815 | newfidp->uid = fidp->uid; |
2289be19 | 1816 | v9fs_path_copy(&newfidp->path, &path); |
9f107513 | 1817 | } |
3cc19c0c | 1818 | err = v9fs_walk_marshal(pdu, nwnames, qids); |
7999f7e1 | 1819 | trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); |
ff5e54c9 | 1820 | out: |
bccacf6c | 1821 | put_fid(pdu, fidp); |
84dfb926 | 1822 | if (newfidp) { |
bccacf6c | 1823 | put_fid(pdu, newfidp); |
84dfb926 | 1824 | } |
2289be19 AK |
1825 | v9fs_path_free(&dpath); |
1826 | v9fs_path_free(&path); | |
84dfb926 | 1827 | out_nofid: |
dc295f83 | 1828 | pdu_complete(pdu, err); |
3cc19c0c AK |
1829 | if (nwnames && nwnames <= P9_MAXWELEM) { |
1830 | for (name_idx = 0; name_idx < nwnames; name_idx++) { | |
1831 | v9fs_string_free(&wnames[name_idx]); | |
1832 | } | |
1833 | g_free(wnames); | |
1834 | g_free(qids); | |
1835 | } | |
9f107513 AL |
1836 | } |
1837 | ||
8440e22e | 1838 | static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) |
5e94c103 MK |
1839 | { |
1840 | struct statfs stbuf; | |
1841 | int32_t iounit = 0; | |
bccacf6c | 1842 | V9fsState *s = pdu->s; |
5e94c103 MK |
1843 | |
1844 | /* | |
1845 | * iounit should be multiples of f_bsize (host filesystem block size | |
1846 | * and as well as less than (client msize - P9_IOHDRSZ)) | |
1847 | */ | |
bccacf6c | 1848 | if (!v9fs_co_statfs(pdu, path, &stbuf)) { |
68d654da DS |
1849 | if (stbuf.f_bsize) { |
1850 | iounit = stbuf.f_bsize; | |
1851 | iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize; | |
1852 | } | |
5e94c103 | 1853 | } |
5e94c103 MK |
1854 | if (!iounit) { |
1855 | iounit = s->msize - P9_IOHDRSZ; | |
1856 | } | |
1857 | return iounit; | |
1858 | } | |
1859 | ||
8440e22e | 1860 | static void coroutine_fn v9fs_open(void *opaque) |
5e94c103 | 1861 | { |
857bc158 | 1862 | int flags; |
857bc158 AK |
1863 | int32_t fid; |
1864 | int32_t mode; | |
1865 | V9fsQID qid; | |
7999f7e1 | 1866 | int iounit = 0; |
857bc158 AK |
1867 | ssize_t err = 0; |
1868 | size_t offset = 7; | |
1869 | struct stat stbuf; | |
1870 | V9fsFidState *fidp; | |
1871 | V9fsPDU *pdu = opaque; | |
1872 | V9fsState *s = pdu->s; | |
5e94c103 | 1873 | |
857bc158 | 1874 | if (s->proto_version == V9FS_PROTO_2000L) { |
ddca7f86 | 1875 | err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); |
857bc158 | 1876 | } else { |
67d6fa53 BH |
1877 | uint8_t modebyte; |
1878 | err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); | |
1879 | mode = modebyte; | |
ddca7f86 MK |
1880 | } |
1881 | if (err < 0) { | |
1882 | goto out_nofid; | |
857bc158 | 1883 | } |
c572f23a HPB |
1884 | trace_v9fs_open(pdu->tag, pdu->id, fid, mode); |
1885 | ||
bccacf6c | 1886 | fidp = get_fid(pdu, fid); |
857bc158 AK |
1887 | if (fidp == NULL) { |
1888 | err = -ENOENT; | |
84dfb926 | 1889 | goto out_nofid; |
a6568fe2 | 1890 | } |
49dd946b GK |
1891 | if (fidp->fid_type != P9_FID_NONE) { |
1892 | err = -EINVAL; | |
1893 | goto out; | |
1894 | } | |
a6568fe2 | 1895 | |
bccacf6c | 1896 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
857bc158 | 1897 | if (err < 0) { |
a6568fe2 AL |
1898 | goto out; |
1899 | } | |
3b5ee9e8 AM |
1900 | err = stat_to_qid(pdu, &stbuf, &qid); |
1901 | if (err < 0) { | |
1902 | goto out; | |
1903 | } | |
857bc158 | 1904 | if (S_ISDIR(stbuf.st_mode)) { |
bccacf6c | 1905 | err = v9fs_co_opendir(pdu, fidp); |
857bc158 AK |
1906 | if (err < 0) { |
1907 | goto out; | |
1908 | } | |
1909 | fidp->fid_type = P9_FID_DIR; | |
ddca7f86 MK |
1910 | err = pdu_marshal(pdu, offset, "Qd", &qid, 0); |
1911 | if (err < 0) { | |
1912 | goto out; | |
1913 | } | |
1914 | err += offset; | |
a6568fe2 | 1915 | } else { |
771e9d4c | 1916 | if (s->proto_version == V9FS_PROTO_2000L) { |
d3ab98e6 | 1917 | flags = get_dotl_openflags(s, mode); |
771e9d4c | 1918 | } else { |
857bc158 | 1919 | flags = omode_to_uflags(mode); |
771e9d4c | 1920 | } |
2c74c2cb MK |
1921 | if (is_ro_export(&s->ctx)) { |
1922 | if (mode & O_WRONLY || mode & O_RDWR || | |
1923 | mode & O_APPEND || mode & O_TRUNC) { | |
1924 | err = -EROFS; | |
1925 | goto out; | |
1926 | } | |
2c74c2cb | 1927 | } |
bccacf6c | 1928 | err = v9fs_co_open(pdu, fidp, flags); |
857bc158 AK |
1929 | if (err < 0) { |
1930 | goto out; | |
1931 | } | |
1932 | fidp->fid_type = P9_FID_FILE; | |
7a462745 AK |
1933 | fidp->open_flags = flags; |
1934 | if (flags & O_EXCL) { | |
1935 | /* | |
1936 | * We let the host file system do O_EXCL check | |
1937 | * We should not reclaim such fd | |
1938 | */ | |
1939 | fidp->flags |= FID_NON_RECLAIMABLE; | |
1940 | } | |
bccacf6c | 1941 | iounit = get_iounit(pdu, &fidp->path); |
ddca7f86 MK |
1942 | err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
1943 | if (err < 0) { | |
1944 | goto out; | |
1945 | } | |
1946 | err += offset; | |
a6568fe2 | 1947 | } |
7999f7e1 AK |
1948 | trace_v9fs_open_return(pdu->tag, pdu->id, |
1949 | qid.type, qid.version, qid.path, iounit); | |
a6568fe2 | 1950 | out: |
bccacf6c | 1951 | put_fid(pdu, fidp); |
84dfb926 | 1952 | out_nofid: |
dc295f83 | 1953 | pdu_complete(pdu, err); |
a6568fe2 AL |
1954 | } |
1955 | ||
8440e22e | 1956 | static void coroutine_fn v9fs_lcreate(void *opaque) |
c1568af5 VJ |
1957 | { |
1958 | int32_t dfid, flags, mode; | |
1959 | gid_t gid; | |
c1568af5 | 1960 | ssize_t err = 0; |
36f8981f | 1961 | ssize_t offset = 7; |
36f8981f VJ |
1962 | V9fsString name; |
1963 | V9fsFidState *fidp; | |
1964 | struct stat stbuf; | |
1965 | V9fsQID qid; | |
1966 | int32_t iounit; | |
1967 | V9fsPDU *pdu = opaque; | |
c1568af5 | 1968 | |
ddca7f86 MK |
1969 | v9fs_string_init(&name); |
1970 | err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, | |
1971 | &name, &flags, &mode, &gid); | |
1972 | if (err < 0) { | |
1973 | goto out_nofid; | |
1974 | } | |
c572f23a | 1975 | trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); |
c1568af5 | 1976 | |
fff39a7a GK |
1977 | if (name_is_illegal(name.data)) { |
1978 | err = -ENOENT; | |
1979 | goto out_nofid; | |
1980 | } | |
1981 | ||
805b5d98 GK |
1982 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
1983 | err = -EEXIST; | |
1984 | goto out_nofid; | |
1985 | } | |
1986 | ||
bccacf6c | 1987 | fidp = get_fid(pdu, dfid); |
36f8981f | 1988 | if (fidp == NULL) { |
c1568af5 | 1989 | err = -ENOENT; |
84dfb926 | 1990 | goto out_nofid; |
c1568af5 | 1991 | } |
d63fb193 LQ |
1992 | if (fidp->fid_type != P9_FID_NONE) { |
1993 | err = -EINVAL; | |
1994 | goto out; | |
1995 | } | |
c1568af5 | 1996 | |
d3ab98e6 | 1997 | flags = get_dotl_openflags(pdu->s, flags); |
bccacf6c | 1998 | err = v9fs_co_open2(pdu, fidp, &name, gid, |
02cb7f3a | 1999 | flags | O_CREAT, mode, &stbuf); |
36f8981f VJ |
2000 | if (err < 0) { |
2001 | goto out; | |
2002 | } | |
2003 | fidp->fid_type = P9_FID_FILE; | |
7a462745 AK |
2004 | fidp->open_flags = flags; |
2005 | if (flags & O_EXCL) { | |
2006 | /* | |
2007 | * We let the host file system do O_EXCL check | |
2008 | * We should not reclaim such fd | |
2009 | */ | |
2010 | fidp->flags |= FID_NON_RECLAIMABLE; | |
2011 | } | |
bccacf6c | 2012 | iounit = get_iounit(pdu, &fidp->path); |
3b5ee9e8 AM |
2013 | err = stat_to_qid(pdu, &stbuf, &qid); |
2014 | if (err < 0) { | |
2015 | goto out; | |
2016 | } | |
ddca7f86 MK |
2017 | err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
2018 | if (err < 0) { | |
2019 | goto out; | |
2020 | } | |
2021 | err += offset; | |
7999f7e1 AK |
2022 | trace_v9fs_lcreate_return(pdu->tag, pdu->id, |
2023 | qid.type, qid.version, qid.path, iounit); | |
c1568af5 | 2024 | out: |
bccacf6c | 2025 | put_fid(pdu, fidp); |
84dfb926 | 2026 | out_nofid: |
dc295f83 | 2027 | pdu_complete(pdu, err); |
36f8981f | 2028 | v9fs_string_free(&name); |
c1568af5 VJ |
2029 | } |
2030 | ||
a1bf8b74 | 2031 | static void coroutine_fn v9fs_fsync(void *opaque) |
b41e95d3 | 2032 | { |
4e9ad444 | 2033 | int err; |
b41e95d3 | 2034 | int32_t fid; |
4e9ad444 | 2035 | int datasync; |
b41e95d3 VJ |
2036 | size_t offset = 7; |
2037 | V9fsFidState *fidp; | |
4e9ad444 | 2038 | V9fsPDU *pdu = opaque; |
b41e95d3 | 2039 | |
ddca7f86 MK |
2040 | err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); |
2041 | if (err < 0) { | |
2042 | goto out_nofid; | |
2043 | } | |
c572f23a HPB |
2044 | trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); |
2045 | ||
bccacf6c | 2046 | fidp = get_fid(pdu, fid); |
b41e95d3 VJ |
2047 | if (fidp == NULL) { |
2048 | err = -ENOENT; | |
84dfb926 | 2049 | goto out_nofid; |
b41e95d3 | 2050 | } |
bccacf6c | 2051 | err = v9fs_co_fsync(pdu, fidp, datasync); |
4e9ad444 AK |
2052 | if (!err) { |
2053 | err = offset; | |
2054 | } | |
bccacf6c | 2055 | put_fid(pdu, fidp); |
84dfb926 | 2056 | out_nofid: |
dc295f83 | 2057 | pdu_complete(pdu, err); |
b41e95d3 VJ |
2058 | } |
2059 | ||
8440e22e | 2060 | static void coroutine_fn v9fs_clunk(void *opaque) |
a6568fe2 | 2061 | { |
c540ee51 | 2062 | int err; |
bbd5697b AL |
2063 | int32_t fid; |
2064 | size_t offset = 7; | |
84dfb926 | 2065 | V9fsFidState *fidp; |
c540ee51 AK |
2066 | V9fsPDU *pdu = opaque; |
2067 | V9fsState *s = pdu->s; | |
bbd5697b | 2068 | |
ddca7f86 MK |
2069 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
2070 | if (err < 0) { | |
2071 | goto out_nofid; | |
2072 | } | |
c572f23a | 2073 | trace_v9fs_clunk(pdu->tag, pdu->id, fid); |
84dfb926 | 2074 | |
ce421a19 | 2075 | fidp = clunk_fid(s, fid); |
84dfb926 AK |
2076 | if (fidp == NULL) { |
2077 | err = -ENOENT; | |
2078 | goto out_nofid; | |
2079 | } | |
ce421a19 AK |
2080 | /* |
2081 | * Bump the ref so that put_fid will | |
2082 | * free the fid. | |
2083 | */ | |
2084 | fidp->ref++; | |
a911a182 AK |
2085 | err = put_fid(pdu, fidp); |
2086 | if (!err) { | |
2087 | err = offset; | |
2088 | } | |
84dfb926 | 2089 | out_nofid: |
dc295f83 | 2090 | pdu_complete(pdu, err); |
9f107513 AL |
2091 | } |
2092 | ||
bcb8998f SS |
2093 | /* |
2094 | * Create a QEMUIOVector for a sub-region of PDU iovecs | |
2095 | * | |
2096 | * @qiov: uninitialized QEMUIOVector | |
2097 | * @skip: number of bytes to skip from beginning of PDU | |
2098 | * @size: number of bytes to include | |
2099 | * @is_write: true - write, false - read | |
2100 | * | |
2101 | * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up | |
2102 | * with qemu_iovec_destroy(). | |
2103 | */ | |
2104 | static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, | |
16724a17 | 2105 | size_t skip, size_t *size, |
bcb8998f SS |
2106 | bool is_write) |
2107 | { | |
2108 | QEMUIOVector elem; | |
2109 | struct iovec *iov; | |
2110 | unsigned int niov; | |
16724a17 | 2111 | size_t alloc_size = *size + skip; |
bcb8998f | 2112 | |
88da0b03 | 2113 | if (is_write) { |
16724a17 | 2114 | pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, alloc_size); |
88da0b03 | 2115 | } else { |
16724a17 GK |
2116 | pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, &alloc_size); |
2117 | } | |
2118 | ||
2119 | if (alloc_size < skip) { | |
2120 | *size = 0; | |
2121 | } else { | |
2122 | *size = alloc_size - skip; | |
88da0b03 | 2123 | } |
bcb8998f SS |
2124 | |
2125 | qemu_iovec_init_external(&elem, iov, niov); | |
2126 | qemu_iovec_init(qiov, niov); | |
16724a17 | 2127 | qemu_iovec_concat(qiov, &elem, skip, *size); |
bcb8998f SS |
2128 | } |
2129 | ||
2f008a8c AK |
2130 | static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, |
2131 | uint64_t off, uint32_t max_count) | |
a9231555 | 2132 | { |
ddca7f86 | 2133 | ssize_t err; |
d208a0e0 | 2134 | size_t offset = 7; |
16724a17 | 2135 | size_t read_count; |
bcb8998f | 2136 | QEMUIOVector qiov_full; |
a9231555 | 2137 | |
7e55d65c LQ |
2138 | if (fidp->fs.xattr.len < off) { |
2139 | read_count = 0; | |
16724a17 | 2140 | } else if (fidp->fs.xattr.len - off < max_count) { |
7e55d65c | 2141 | read_count = fidp->fs.xattr.len - off; |
16724a17 | 2142 | } else { |
d208a0e0 | 2143 | read_count = max_count; |
a9231555 | 2144 | } |
ddca7f86 MK |
2145 | err = pdu_marshal(pdu, offset, "d", read_count); |
2146 | if (err < 0) { | |
2147 | return err; | |
2148 | } | |
2149 | offset += err; | |
00588a0a | 2150 | |
16724a17 | 2151 | v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, &read_count, false); |
fa0eb5c5 | 2152 | err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, |
ddca7f86 MK |
2153 | ((char *)fidp->fs.xattr.value) + off, |
2154 | read_count); | |
bcb8998f | 2155 | qemu_iovec_destroy(&qiov_full); |
ddca7f86 MK |
2156 | if (err < 0) { |
2157 | return err; | |
2158 | } | |
2159 | offset += err; | |
d208a0e0 | 2160 | return offset; |
a9231555 AL |
2161 | } |
2162 | ||
8440e22e GK |
2163 | static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, |
2164 | V9fsFidState *fidp, | |
2165 | uint32_t max_count) | |
a9231555 | 2166 | { |
2289be19 | 2167 | V9fsPath path; |
d208a0e0 AK |
2168 | V9fsStat v9stat; |
2169 | int len, err = 0; | |
2170 | int32_t count = 0; | |
2171 | struct stat stbuf; | |
2172 | off_t saved_dir_pos; | |
635324e8 | 2173 | struct dirent *dent; |
a9231555 | 2174 | |
d208a0e0 | 2175 | /* save the directory position */ |
bccacf6c | 2176 | saved_dir_pos = v9fs_co_telldir(pdu, fidp); |
d208a0e0 AK |
2177 | if (saved_dir_pos < 0) { |
2178 | return saved_dir_pos; | |
a9231555 | 2179 | } |
5f524c1e | 2180 | |
d208a0e0 | 2181 | while (1) { |
2289be19 | 2182 | v9fs_path_init(&path); |
7cde47d4 GK |
2183 | |
2184 | v9fs_readdir_lock(&fidp->fs.dir); | |
2185 | ||
635324e8 GK |
2186 | err = v9fs_co_readdir(pdu, fidp, &dent); |
2187 | if (err || !dent) { | |
d208a0e0 AK |
2188 | break; |
2189 | } | |
bccacf6c | 2190 | err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); |
d208a0e0 | 2191 | if (err < 0) { |
8762a46d | 2192 | break; |
d208a0e0 | 2193 | } |
bccacf6c | 2194 | err = v9fs_co_lstat(pdu, &path, &stbuf); |
2289be19 | 2195 | if (err < 0) { |
8762a46d | 2196 | break; |
2289be19 | 2197 | } |
6069537f | 2198 | err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); |
d208a0e0 | 2199 | if (err < 0) { |
8762a46d | 2200 | break; |
a9231555 | 2201 | } |
772a7369 JD |
2202 | if ((count + v9stat.size + 2) > max_count) { |
2203 | v9fs_readdir_unlock(&fidp->fs.dir); | |
2204 | ||
2205 | /* Ran out of buffer. Set dir back to old position and return */ | |
2206 | v9fs_co_seekdir(pdu, fidp, saved_dir_pos); | |
2207 | v9fs_stat_free(&v9stat); | |
2208 | v9fs_path_free(&path); | |
2209 | return count; | |
2210 | } | |
2211 | ||
d208a0e0 AK |
2212 | /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ |
2213 | len = pdu_marshal(pdu, 11 + count, "S", &v9stat); | |
7cde47d4 GK |
2214 | |
2215 | v9fs_readdir_unlock(&fidp->fs.dir); | |
2216 | ||
772a7369 | 2217 | if (len < 0) { |
bccacf6c | 2218 | v9fs_co_seekdir(pdu, fidp, saved_dir_pos); |
d208a0e0 | 2219 | v9fs_stat_free(&v9stat); |
2289be19 | 2220 | v9fs_path_free(&path); |
772a7369 | 2221 | return len; |
d208a0e0 AK |
2222 | } |
2223 | count += len; | |
2224 | v9fs_stat_free(&v9stat); | |
2289be19 | 2225 | v9fs_path_free(&path); |
d208a0e0 | 2226 | saved_dir_pos = dent->d_off; |
a9231555 | 2227 | } |
8762a46d | 2228 | |
7cde47d4 GK |
2229 | v9fs_readdir_unlock(&fidp->fs.dir); |
2230 | ||
2289be19 | 2231 | v9fs_path_free(&path); |
d208a0e0 AK |
2232 | if (err < 0) { |
2233 | return err; | |
fa32ef88 | 2234 | } |
d208a0e0 | 2235 | return count; |
fa32ef88 AK |
2236 | } |
2237 | ||
8440e22e | 2238 | static void coroutine_fn v9fs_read(void *opaque) |
9f107513 | 2239 | { |
a9231555 | 2240 | int32_t fid; |
2f008a8c | 2241 | uint64_t off; |
a9231555 | 2242 | ssize_t err = 0; |
d208a0e0 AK |
2243 | int32_t count = 0; |
2244 | size_t offset = 7; | |
2f008a8c | 2245 | uint32_t max_count; |
d208a0e0 AK |
2246 | V9fsFidState *fidp; |
2247 | V9fsPDU *pdu = opaque; | |
2248 | V9fsState *s = pdu->s; | |
a9231555 | 2249 | |
ddca7f86 MK |
2250 | err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); |
2251 | if (err < 0) { | |
2252 | goto out_nofid; | |
2253 | } | |
c572f23a | 2254 | trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); |
84dfb926 | 2255 | |
bccacf6c | 2256 | fidp = get_fid(pdu, fid); |
d208a0e0 | 2257 | if (fidp == NULL) { |
a9231555 | 2258 | err = -EINVAL; |
84dfb926 | 2259 | goto out_nofid; |
a9231555 | 2260 | } |
d208a0e0 | 2261 | if (fidp->fid_type == P9_FID_DIR) { |
a9231555 | 2262 | |
d208a0e0 | 2263 | if (off == 0) { |
bccacf6c | 2264 | v9fs_co_rewinddir(pdu, fidp); |
a9231555 | 2265 | } |
bccacf6c | 2266 | count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); |
d208a0e0 AK |
2267 | if (count < 0) { |
2268 | err = count; | |
2269 | goto out; | |
56d15a53 | 2270 | } |
ddca7f86 MK |
2271 | err = pdu_marshal(pdu, offset, "d", count); |
2272 | if (err < 0) { | |
2273 | goto out; | |
2274 | } | |
2275 | err += offset + count; | |
d208a0e0 | 2276 | } else if (fidp->fid_type == P9_FID_FILE) { |
302a0d3e SH |
2277 | QEMUIOVector qiov_full; |
2278 | QEMUIOVector qiov; | |
d208a0e0 | 2279 | int32_t len; |
16724a17 | 2280 | size_t size = max_count; |
d208a0e0 | 2281 | |
16724a17 | 2282 | v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, &size, false); |
302a0d3e | 2283 | qemu_iovec_init(&qiov, qiov_full.niov); |
16724a17 | 2284 | max_count = size; |
d208a0e0 | 2285 | do { |
302a0d3e | 2286 | qemu_iovec_reset(&qiov); |
1b093c48 | 2287 | qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); |
d208a0e0 | 2288 | if (0) { |
302a0d3e | 2289 | print_sg(qiov.iov, qiov.niov); |
d208a0e0 AK |
2290 | } |
2291 | /* Loop in case of EINTR */ | |
2292 | do { | |
302a0d3e | 2293 | len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); |
d208a0e0 AK |
2294 | if (len >= 0) { |
2295 | off += len; | |
2296 | count += len; | |
2297 | } | |
bccacf6c | 2298 | } while (len == -EINTR && !pdu->cancelled); |
d208a0e0 AK |
2299 | if (len < 0) { |
2300 | /* IO error return the error */ | |
2301 | err = len; | |
e95c9a49 | 2302 | goto out_free_iovec; |
d208a0e0 | 2303 | } |
d208a0e0 | 2304 | } while (count < max_count && len > 0); |
ddca7f86 MK |
2305 | err = pdu_marshal(pdu, offset, "d", count); |
2306 | if (err < 0) { | |
e95c9a49 | 2307 | goto out_free_iovec; |
ddca7f86 MK |
2308 | } |
2309 | err += offset + count; | |
e95c9a49 | 2310 | out_free_iovec: |
302a0d3e SH |
2311 | qemu_iovec_destroy(&qiov); |
2312 | qemu_iovec_destroy(&qiov_full); | |
d208a0e0 AK |
2313 | } else if (fidp->fid_type == P9_FID_XATTR) { |
2314 | err = v9fs_xattr_read(s, pdu, fidp, off, max_count); | |
a9231555 AL |
2315 | } else { |
2316 | err = -EINVAL; | |
9f107513 | 2317 | } |
7999f7e1 | 2318 | trace_v9fs_read_return(pdu->tag, pdu->id, count, err); |
a9231555 | 2319 | out: |
bccacf6c | 2320 | put_fid(pdu, fidp); |
84dfb926 | 2321 | out_nofid: |
dc295f83 | 2322 | pdu_complete(pdu, err); |
9f107513 AL |
2323 | } |
2324 | ||
5e4eaa79 | 2325 | static size_t v9fs_readdir_data_size(V9fsString *name) |
c18e2f94 | 2326 | { |
5e4eaa79 AK |
2327 | /* |
2328 | * Size of each dirent on the wire: size of qid (13) + size of offset (8) | |
2329 | * size of type (1) + size of name.size (2) + strlen(name.data) | |
2330 | */ | |
2331 | return 24 + v9fs_string_size(name); | |
c18e2f94 SK |
2332 | } |
2333 | ||
8440e22e GK |
2334 | static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, |
2335 | int32_t max_count) | |
c18e2f94 | 2336 | { |
c18e2f94 | 2337 | size_t size; |
5e4eaa79 AK |
2338 | V9fsQID qid; |
2339 | V9fsString name; | |
2340 | int len, err = 0; | |
2341 | int32_t count = 0; | |
2342 | off_t saved_dir_pos; | |
635324e8 | 2343 | struct dirent *dent; |
c18e2f94 | 2344 | |
5e4eaa79 | 2345 | /* save the directory position */ |
bccacf6c | 2346 | saved_dir_pos = v9fs_co_telldir(pdu, fidp); |
5e4eaa79 AK |
2347 | if (saved_dir_pos < 0) { |
2348 | return saved_dir_pos; | |
2349 | } | |
5f524c1e | 2350 | |
5e4eaa79 | 2351 | while (1) { |
7cde47d4 GK |
2352 | v9fs_readdir_lock(&fidp->fs.dir); |
2353 | ||
635324e8 GK |
2354 | err = v9fs_co_readdir(pdu, fidp, &dent); |
2355 | if (err || !dent) { | |
5e4eaa79 AK |
2356 | break; |
2357 | } | |
2358 | v9fs_string_init(&name); | |
2359 | v9fs_string_sprintf(&name, "%s", dent->d_name); | |
2360 | if ((count + v9fs_readdir_data_size(&name)) > max_count) { | |
7cde47d4 GK |
2361 | v9fs_readdir_unlock(&fidp->fs.dir); |
2362 | ||
c18e2f94 | 2363 | /* Ran out of buffer. Set dir back to old position and return */ |
bccacf6c | 2364 | v9fs_co_seekdir(pdu, fidp, saved_dir_pos); |
5e4eaa79 AK |
2365 | v9fs_string_free(&name); |
2366 | return count; | |
c18e2f94 | 2367 | } |
1a6ed33c AM |
2368 | |
2369 | if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { | |
2370 | /* | |
2371 | * dirent_to_qid() implies expensive stat call for each entry, | |
2372 | * we must do that here though since inode remapping requires | |
2373 | * the device id, which in turn might be different for | |
2374 | * different entries; we cannot make any assumption to avoid | |
2375 | * that here. | |
2376 | */ | |
2377 | err = dirent_to_qid(pdu, fidp, dent, &qid); | |
2378 | if (err < 0) { | |
2379 | v9fs_readdir_unlock(&fidp->fs.dir); | |
2380 | v9fs_co_seekdir(pdu, fidp, saved_dir_pos); | |
2381 | v9fs_string_free(&name); | |
2382 | return err; | |
2383 | } | |
2384 | } else { | |
2385 | /* | |
2386 | * Fill up just the path field of qid because the client uses | |
2387 | * only that. To fill the entire qid structure we will have | |
2388 | * to stat each dirent found, which is expensive. For the | |
2389 | * latter reason we don't call dirent_to_qid() here. Only drawback | |
2390 | * is that no multi-device export detection of stat_to_qid() | |
2391 | * would be done and provided as error to the user here. But | |
2392 | * user would get that error anyway when accessing those | |
2393 | * files/dirs through other ways. | |
2394 | */ | |
2395 | size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); | |
2396 | memcpy(&qid.path, &dent->d_ino, size); | |
2397 | /* Fill the other fields with dummy values */ | |
2398 | qid.type = 0; | |
2399 | qid.version = 0; | |
2400 | } | |
c18e2f94 | 2401 | |
5e4eaa79 AK |
2402 | /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ |
2403 | len = pdu_marshal(pdu, 11 + count, "Qqbs", | |
2404 | &qid, dent->d_off, | |
2405 | dent->d_type, &name); | |
7cde47d4 GK |
2406 | |
2407 | v9fs_readdir_unlock(&fidp->fs.dir); | |
2408 | ||
ddca7f86 MK |
2409 | if (len < 0) { |
2410 | v9fs_co_seekdir(pdu, fidp, saved_dir_pos); | |
2411 | v9fs_string_free(&name); | |
ddca7f86 MK |
2412 | return len; |
2413 | } | |
5e4eaa79 AK |
2414 | count += len; |
2415 | v9fs_string_free(&name); | |
2416 | saved_dir_pos = dent->d_off; | |
2417 | } | |
7cde47d4 GK |
2418 | |
2419 | v9fs_readdir_unlock(&fidp->fs.dir); | |
2420 | ||
5e4eaa79 AK |
2421 | if (err < 0) { |
2422 | return err; | |
2423 | } | |
2424 | return count; | |
c18e2f94 SK |
2425 | } |
2426 | ||
8440e22e | 2427 | static void coroutine_fn v9fs_readdir(void *opaque) |
c18e2f94 SK |
2428 | { |
2429 | int32_t fid; | |
5e4eaa79 AK |
2430 | V9fsFidState *fidp; |
2431 | ssize_t retval = 0; | |
c18e2f94 | 2432 | size_t offset = 7; |
2f008a8c AK |
2433 | uint64_t initial_offset; |
2434 | int32_t count; | |
2435 | uint32_t max_count; | |
5e4eaa79 | 2436 | V9fsPDU *pdu = opaque; |
d36a5c22 | 2437 | V9fsState *s = pdu->s; |
c18e2f94 | 2438 | |
ddca7f86 MK |
2439 | retval = pdu_unmarshal(pdu, offset, "dqd", &fid, |
2440 | &initial_offset, &max_count); | |
2441 | if (retval < 0) { | |
2442 | goto out_nofid; | |
2443 | } | |
c572f23a HPB |
2444 | trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); |
2445 | ||
d36a5c22 CS |
2446 | /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ |
2447 | if (max_count > s->msize - 11) { | |
2448 | max_count = s->msize - 11; | |
2449 | warn_report_once( | |
2450 | "9p: bad client: T_readdir with count > msize - 11" | |
2451 | ); | |
2452 | } | |
2453 | ||
bccacf6c | 2454 | fidp = get_fid(pdu, fid); |
84dfb926 AK |
2455 | if (fidp == NULL) { |
2456 | retval = -EINVAL; | |
2457 | goto out_nofid; | |
2458 | } | |
f314ea4e | 2459 | if (!fidp->fs.dir.stream) { |
5e4eaa79 | 2460 | retval = -EINVAL; |
c18e2f94 SK |
2461 | goto out; |
2462 | } | |
5e4eaa79 | 2463 | if (initial_offset == 0) { |
bccacf6c | 2464 | v9fs_co_rewinddir(pdu, fidp); |
c18e2f94 | 2465 | } else { |
bccacf6c | 2466 | v9fs_co_seekdir(pdu, fidp, initial_offset); |
c18e2f94 | 2467 | } |
bccacf6c | 2468 | count = v9fs_do_readdir(pdu, fidp, max_count); |
5e4eaa79 AK |
2469 | if (count < 0) { |
2470 | retval = count; | |
2471 | goto out; | |
2472 | } | |
ddca7f86 MK |
2473 | retval = pdu_marshal(pdu, offset, "d", count); |
2474 | if (retval < 0) { | |
2475 | goto out; | |
2476 | } | |
2477 | retval += count + offset; | |
7999f7e1 | 2478 | trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); |
c18e2f94 | 2479 | out: |
bccacf6c | 2480 | put_fid(pdu, fidp); |
84dfb926 | 2481 | out_nofid: |
dc295f83 | 2482 | pdu_complete(pdu, retval); |
c18e2f94 SK |
2483 | } |
2484 | ||
d7a90491 | 2485 | static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, |
2f008a8c | 2486 | uint64_t off, uint32_t count, |
d7a90491 | 2487 | struct iovec *sg, int cnt) |
10b468bd AK |
2488 | { |
2489 | int i, to_copy; | |
2490 | ssize_t err = 0; | |
7e55d65c | 2491 | uint64_t write_count; |
d7a90491 | 2492 | size_t offset = 7; |
10b468bd | 2493 | |
d7a90491 | 2494 | |
7e55d65c | 2495 | if (fidp->fs.xattr.len < off) { |
b858e80a | 2496 | return -ENOSPC; |
10b468bd | 2497 | } |
7e55d65c LQ |
2498 | write_count = fidp->fs.xattr.len - off; |
2499 | if (write_count > count) { | |
2500 | write_count = count; | |
2501 | } | |
ddca7f86 MK |
2502 | err = pdu_marshal(pdu, offset, "d", write_count); |
2503 | if (err < 0) { | |
2504 | return err; | |
2505 | } | |
2506 | err += offset; | |
d7a90491 | 2507 | fidp->fs.xattr.copied_len += write_count; |
10b468bd AK |
2508 | /* |
2509 | * Now copy the content from sg list | |
2510 | */ | |
d7a90491 AK |
2511 | for (i = 0; i < cnt; i++) { |
2512 | if (write_count > sg[i].iov_len) { | |
2513 | to_copy = sg[i].iov_len; | |
10b468bd AK |
2514 | } else { |
2515 | to_copy = write_count; | |
2516 | } | |
d7a90491 | 2517 | memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); |
10b468bd | 2518 | /* updating vs->off since we are not using below */ |
d7a90491 | 2519 | off += to_copy; |
10b468bd AK |
2520 | write_count -= to_copy; |
2521 | } | |
b858e80a | 2522 | |
d7a90491 | 2523 | return err; |
10b468bd AK |
2524 | } |
2525 | ||
8440e22e | 2526 | static void coroutine_fn v9fs_write(void *opaque) |
9f107513 | 2527 | { |
d7a90491 AK |
2528 | ssize_t err; |
2529 | int32_t fid; | |
2f008a8c AK |
2530 | uint64_t off; |
2531 | uint32_t count; | |
d7a90491 AK |
2532 | int32_t len = 0; |
2533 | int32_t total = 0; | |
2534 | size_t offset = 7; | |
16724a17 | 2535 | size_t size; |
d7a90491 | 2536 | V9fsFidState *fidp; |
ff06030f VJ |
2537 | V9fsPDU *pdu = opaque; |
2538 | V9fsState *s = pdu->s; | |
302a0d3e SH |
2539 | QEMUIOVector qiov_full; |
2540 | QEMUIOVector qiov; | |
8449360c | 2541 | |
ddca7f86 MK |
2542 | err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); |
2543 | if (err < 0) { | |
dc295f83 | 2544 | pdu_complete(pdu, err); |
0289a412 | 2545 | return; |
ddca7f86 MK |
2546 | } |
2547 | offset += err; | |
16724a17 GK |
2548 | size = count; |
2549 | v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, &size, true); | |
2550 | count = size; | |
302a0d3e | 2551 | trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); |
84dfb926 | 2552 | |
bccacf6c | 2553 | fidp = get_fid(pdu, fid); |
d7a90491 | 2554 | if (fidp == NULL) { |
8449360c | 2555 | err = -EINVAL; |
84dfb926 | 2556 | goto out_nofid; |
9f107513 | 2557 | } |
d7a90491 AK |
2558 | if (fidp->fid_type == P9_FID_FILE) { |
2559 | if (fidp->fs.fd == -1) { | |
10b468bd AK |
2560 | err = -EINVAL; |
2561 | goto out; | |
2562 | } | |
d7a90491 | 2563 | } else if (fidp->fid_type == P9_FID_XATTR) { |
10b468bd AK |
2564 | /* |
2565 | * setxattr operation | |
2566 | */ | |
302a0d3e SH |
2567 | err = v9fs_xattr_write(s, pdu, fidp, off, count, |
2568 | qiov_full.iov, qiov_full.niov); | |
d7a90491 | 2569 | goto out; |
10b468bd | 2570 | } else { |
8449360c AL |
2571 | err = -EINVAL; |
2572 | goto out; | |
2573 | } | |
302a0d3e | 2574 | qemu_iovec_init(&qiov, qiov_full.niov); |
d7a90491 | 2575 | do { |
302a0d3e | 2576 | qemu_iovec_reset(&qiov); |
1b093c48 | 2577 | qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); |
d7a90491 | 2578 | if (0) { |
302a0d3e | 2579 | print_sg(qiov.iov, qiov.niov); |
56d15a53 | 2580 | } |
d7a90491 AK |
2581 | /* Loop in case of EINTR */ |
2582 | do { | |
302a0d3e | 2583 | len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); |
d7a90491 AK |
2584 | if (len >= 0) { |
2585 | off += len; | |
2586 | total += len; | |
2587 | } | |
bccacf6c | 2588 | } while (len == -EINTR && !pdu->cancelled); |
d7a90491 AK |
2589 | if (len < 0) { |
2590 | /* IO error return the error */ | |
2591 | err = len; | |
302a0d3e | 2592 | goto out_qiov; |
d7a90491 | 2593 | } |
d7a90491 | 2594 | } while (total < count && len > 0); |
302a0d3e SH |
2595 | |
2596 | offset = 7; | |
ddca7f86 MK |
2597 | err = pdu_marshal(pdu, offset, "d", total); |
2598 | if (err < 0) { | |
fdfcc9ae | 2599 | goto out_qiov; |
ddca7f86 MK |
2600 | } |
2601 | err += offset; | |
7999f7e1 | 2602 | trace_v9fs_write_return(pdu->tag, pdu->id, total, err); |
302a0d3e SH |
2603 | out_qiov: |
2604 | qemu_iovec_destroy(&qiov); | |
8449360c | 2605 | out: |
bccacf6c | 2606 | put_fid(pdu, fidp); |
84dfb926 | 2607 | out_nofid: |
302a0d3e | 2608 | qemu_iovec_destroy(&qiov_full); |
dc295f83 | 2609 | pdu_complete(pdu, err); |
9f107513 AL |
2610 | } |
2611 | ||
8440e22e | 2612 | static void coroutine_fn v9fs_create(void *opaque) |
5e94c103 | 2613 | { |
baaa86d9 VJ |
2614 | int32_t fid; |
2615 | int err = 0; | |
2616 | size_t offset = 7; | |
2617 | V9fsFidState *fidp; | |
2618 | V9fsQID qid; | |
2619 | int32_t perm; | |
2620 | int8_t mode; | |
2289be19 | 2621 | V9fsPath path; |
baaa86d9 VJ |
2622 | struct stat stbuf; |
2623 | V9fsString name; | |
2624 | V9fsString extension; | |
baaa86d9 VJ |
2625 | int iounit; |
2626 | V9fsPDU *pdu = opaque; | |
5b3c77aa | 2627 | V9fsState *s = pdu->s; |
c494dd6f | 2628 | |
2289be19 | 2629 | v9fs_path_init(&path); |
ddca7f86 MK |
2630 | v9fs_string_init(&name); |
2631 | v9fs_string_init(&extension); | |
2632 | err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, | |
2633 | &perm, &mode, &extension); | |
2634 | if (err < 0) { | |
2635 | goto out_nofid; | |
2636 | } | |
c572f23a HPB |
2637 | trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); |
2638 | ||
fff39a7a GK |
2639 | if (name_is_illegal(name.data)) { |
2640 | err = -ENOENT; | |
2641 | goto out_nofid; | |
2642 | } | |
2643 | ||
805b5d98 GK |
2644 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
2645 | err = -EEXIST; | |
2646 | goto out_nofid; | |
2647 | } | |
2648 | ||
bccacf6c | 2649 | fidp = get_fid(pdu, fid); |
baaa86d9 VJ |
2650 | if (fidp == NULL) { |
2651 | err = -EINVAL; | |
84dfb926 | 2652 | goto out_nofid; |
c494dd6f | 2653 | } |
d63fb193 LQ |
2654 | if (fidp->fid_type != P9_FID_NONE) { |
2655 | err = -EINVAL; | |
2656 | goto out; | |
2657 | } | |
baaa86d9 | 2658 | if (perm & P9_STAT_MODE_DIR) { |
bccacf6c | 2659 | err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, |
02cb7f3a | 2660 | fidp->uid, -1, &stbuf); |
baaa86d9 VJ |
2661 | if (err < 0) { |
2662 | goto out; | |
2663 | } | |
bccacf6c | 2664 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2665 | if (err < 0) { |
2666 | goto out; | |
2667 | } | |
5b3c77aa | 2668 | v9fs_path_write_lock(s); |
2289be19 | 2669 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2670 | v9fs_path_unlock(s); |
bccacf6c | 2671 | err = v9fs_co_opendir(pdu, fidp); |
baaa86d9 VJ |
2672 | if (err < 0) { |
2673 | goto out; | |
2674 | } | |
2675 | fidp->fid_type = P9_FID_DIR; | |
2676 | } else if (perm & P9_STAT_MODE_SYMLINK) { | |
bccacf6c | 2677 | err = v9fs_co_symlink(pdu, fidp, &name, |
02cb7f3a | 2678 | extension.data, -1 , &stbuf); |
baaa86d9 | 2679 | if (err < 0) { |
baaa86d9 VJ |
2680 | goto out; |
2681 | } | |
bccacf6c | 2682 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2683 | if (err < 0) { |
2684 | goto out; | |
2685 | } | |
5b3c77aa | 2686 | v9fs_path_write_lock(s); |
2289be19 | 2687 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2688 | v9fs_path_unlock(s); |
baaa86d9 | 2689 | } else if (perm & P9_STAT_MODE_LINK) { |
2289be19 | 2690 | int32_t ofid = atoi(extension.data); |
bccacf6c | 2691 | V9fsFidState *ofidp = get_fid(pdu, ofid); |
2289be19 | 2692 | if (ofidp == NULL) { |
baaa86d9 VJ |
2693 | err = -EINVAL; |
2694 | goto out; | |
2695 | } | |
bccacf6c AK |
2696 | err = v9fs_co_link(pdu, ofidp, fidp, &name); |
2697 | put_fid(pdu, ofidp); | |
2289be19 AK |
2698 | if (err < 0) { |
2699 | goto out; | |
2700 | } | |
bccacf6c | 2701 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
baaa86d9 | 2702 | if (err < 0) { |
2289be19 | 2703 | fidp->fid_type = P9_FID_NONE; |
baaa86d9 | 2704 | goto out; |
c494dd6f | 2705 | } |
5b3c77aa | 2706 | v9fs_path_write_lock(s); |
2289be19 | 2707 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2708 | v9fs_path_unlock(s); |
bccacf6c | 2709 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
02cb7f3a AK |
2710 | if (err < 0) { |
2711 | fidp->fid_type = P9_FID_NONE; | |
2712 | goto out; | |
2713 | } | |
baaa86d9 | 2714 | } else if (perm & P9_STAT_MODE_DEVICE) { |
c494dd6f AL |
2715 | char ctype; |
2716 | uint32_t major, minor; | |
2717 | mode_t nmode = 0; | |
2718 | ||
baaa86d9 | 2719 | if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { |
c494dd6f | 2720 | err = -errno; |
baaa86d9 | 2721 | goto out; |
c494dd6f AL |
2722 | } |
2723 | ||
2724 | switch (ctype) { | |
2725 | case 'c': | |
2726 | nmode = S_IFCHR; | |
2727 | break; | |
2728 | case 'b': | |
2729 | nmode = S_IFBLK; | |
2730 | break; | |
2731 | default: | |
2732 | err = -EIO; | |
baaa86d9 VJ |
2733 | goto out; |
2734 | } | |
c1568af5 | 2735 | |
baaa86d9 | 2736 | nmode |= perm & 0777; |
bccacf6c | 2737 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
02cb7f3a | 2738 | makedev(major, minor), nmode, &stbuf); |
baaa86d9 VJ |
2739 | if (err < 0) { |
2740 | goto out; | |
2741 | } | |
bccacf6c | 2742 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2743 | if (err < 0) { |
2744 | goto out; | |
2745 | } | |
5b3c77aa | 2746 | v9fs_path_write_lock(s); |
2289be19 | 2747 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2748 | v9fs_path_unlock(s); |
baaa86d9 | 2749 | } else if (perm & P9_STAT_MODE_NAMED_PIPE) { |
bccacf6c | 2750 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
02cb7f3a | 2751 | 0, S_IFIFO | (perm & 0777), &stbuf); |
baaa86d9 VJ |
2752 | if (err < 0) { |
2753 | goto out; | |
2754 | } | |
bccacf6c | 2755 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2756 | if (err < 0) { |
2757 | goto out; | |
2758 | } | |
5b3c77aa | 2759 | v9fs_path_write_lock(s); |
2289be19 | 2760 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2761 | v9fs_path_unlock(s); |
baaa86d9 | 2762 | } else if (perm & P9_STAT_MODE_SOCKET) { |
bccacf6c | 2763 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
02cb7f3a | 2764 | 0, S_IFSOCK | (perm & 0777), &stbuf); |
baaa86d9 VJ |
2765 | if (err < 0) { |
2766 | goto out; | |
2767 | } | |
bccacf6c | 2768 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2769 | if (err < 0) { |
2770 | goto out; | |
2771 | } | |
5b3c77aa | 2772 | v9fs_path_write_lock(s); |
2289be19 | 2773 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2774 | v9fs_path_unlock(s); |
baaa86d9 | 2775 | } else { |
bccacf6c | 2776 | err = v9fs_co_open2(pdu, fidp, &name, -1, |
02cb7f3a | 2777 | omode_to_uflags(mode)|O_CREAT, perm, &stbuf); |
baaa86d9 VJ |
2778 | if (err < 0) { |
2779 | goto out; | |
2780 | } | |
2781 | fidp->fid_type = P9_FID_FILE; | |
7a462745 AK |
2782 | fidp->open_flags = omode_to_uflags(mode); |
2783 | if (fidp->open_flags & O_EXCL) { | |
2784 | /* | |
2785 | * We let the host file system do O_EXCL check | |
2786 | * We should not reclaim such fd | |
2787 | */ | |
2788 | fidp->flags |= FID_NON_RECLAIMABLE; | |
2789 | } | |
c494dd6f | 2790 | } |
bccacf6c | 2791 | iounit = get_iounit(pdu, &fidp->path); |
3b5ee9e8 AM |
2792 | err = stat_to_qid(pdu, &stbuf, &qid); |
2793 | if (err < 0) { | |
2794 | goto out; | |
2795 | } | |
ddca7f86 MK |
2796 | err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
2797 | if (err < 0) { | |
2798 | goto out; | |
2799 | } | |
2800 | err += offset; | |
7999f7e1 AK |
2801 | trace_v9fs_create_return(pdu->tag, pdu->id, |
2802 | qid.type, qid.version, qid.path, iounit); | |
c494dd6f | 2803 | out: |
bccacf6c | 2804 | put_fid(pdu, fidp); |
84dfb926 | 2805 | out_nofid: |
dc295f83 | 2806 | pdu_complete(pdu, err); |
baaa86d9 VJ |
2807 | v9fs_string_free(&name); |
2808 | v9fs_string_free(&extension); | |
2289be19 | 2809 | v9fs_path_free(&path); |
9f107513 AL |
2810 | } |
2811 | ||
8440e22e | 2812 | static void coroutine_fn v9fs_symlink(void *opaque) |
08c60fc9 | 2813 | { |
ff06030f | 2814 | V9fsPDU *pdu = opaque; |
3fa2a8d1 VJ |
2815 | V9fsString name; |
2816 | V9fsString symname; | |
3fa2a8d1 VJ |
2817 | V9fsFidState *dfidp; |
2818 | V9fsQID qid; | |
2819 | struct stat stbuf; | |
08c60fc9 | 2820 | int32_t dfid; |
08c60fc9 VJ |
2821 | int err = 0; |
2822 | gid_t gid; | |
3fa2a8d1 | 2823 | size_t offset = 7; |
08c60fc9 | 2824 | |
ddca7f86 MK |
2825 | v9fs_string_init(&name); |
2826 | v9fs_string_init(&symname); | |
2827 | err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); | |
2828 | if (err < 0) { | |
2829 | goto out_nofid; | |
2830 | } | |
c572f23a | 2831 | trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); |
08c60fc9 | 2832 | |
fff39a7a GK |
2833 | if (name_is_illegal(name.data)) { |
2834 | err = -ENOENT; | |
2835 | goto out_nofid; | |
2836 | } | |
2837 | ||
805b5d98 GK |
2838 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
2839 | err = -EEXIST; | |
2840 | goto out_nofid; | |
2841 | } | |
2842 | ||
bccacf6c | 2843 | dfidp = get_fid(pdu, dfid); |
3fa2a8d1 | 2844 | if (dfidp == NULL) { |
08c60fc9 | 2845 | err = -EINVAL; |
84dfb926 | 2846 | goto out_nofid; |
08c60fc9 | 2847 | } |
bccacf6c | 2848 | err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); |
3fa2a8d1 VJ |
2849 | if (err < 0) { |
2850 | goto out; | |
2851 | } | |
3b5ee9e8 AM |
2852 | err = stat_to_qid(pdu, &stbuf, &qid); |
2853 | if (err < 0) { | |
2854 | goto out; | |
2855 | } | |
ddca7f86 MK |
2856 | err = pdu_marshal(pdu, offset, "Q", &qid); |
2857 | if (err < 0) { | |
2858 | goto out; | |
2859 | } | |
2860 | err += offset; | |
7999f7e1 AK |
2861 | trace_v9fs_symlink_return(pdu->tag, pdu->id, |
2862 | qid.type, qid.version, qid.path); | |
08c60fc9 | 2863 | out: |
bccacf6c | 2864 | put_fid(pdu, dfidp); |
84dfb926 | 2865 | out_nofid: |
dc295f83 | 2866 | pdu_complete(pdu, err); |
3fa2a8d1 VJ |
2867 | v9fs_string_free(&name); |
2868 | v9fs_string_free(&symname); | |
08c60fc9 VJ |
2869 | } |
2870 | ||
a1bf8b74 | 2871 | static void coroutine_fn v9fs_flush(void *opaque) |
9f107513 | 2872 | { |
ddca7f86 | 2873 | ssize_t err; |
bccacf6c AK |
2874 | int16_t tag; |
2875 | size_t offset = 7; | |
d5f2af7b | 2876 | V9fsPDU *cancel_pdu = NULL; |
ff06030f VJ |
2877 | V9fsPDU *pdu = opaque; |
2878 | V9fsState *s = pdu->s; | |
bccacf6c | 2879 | |
ddca7f86 MK |
2880 | err = pdu_unmarshal(pdu, offset, "w", &tag); |
2881 | if (err < 0) { | |
dc295f83 | 2882 | pdu_complete(pdu, err); |
ddca7f86 MK |
2883 | return; |
2884 | } | |
c572f23a | 2885 | trace_v9fs_flush(pdu->tag, pdu->id, tag); |
bccacf6c | 2886 | |
d5f2af7b | 2887 | if (pdu->tag == tag) { |
3dc6f869 | 2888 | warn_report("the guest sent a self-referencing 9P flush request"); |
d5f2af7b GK |
2889 | } else { |
2890 | QLIST_FOREACH(cancel_pdu, &s->active_list, next) { | |
2891 | if (cancel_pdu->tag == tag) { | |
2892 | break; | |
2893 | } | |
bccacf6c AK |
2894 | } |
2895 | } | |
2896 | if (cancel_pdu) { | |
2897 | cancel_pdu->cancelled = 1; | |
2898 | /* | |
2899 | * Wait for pdu to complete. | |
2900 | */ | |
1ace7cea | 2901 | qemu_co_queue_wait(&cancel_pdu->complete, NULL); |
18adde86 GK |
2902 | if (!qemu_co_queue_next(&cancel_pdu->complete)) { |
2903 | cancel_pdu->cancelled = 0; | |
2904 | pdu_free(cancel_pdu); | |
2905 | } | |
bccacf6c | 2906 | } |
dc295f83 | 2907 | pdu_complete(pdu, 7); |
9f107513 AL |
2908 | } |
2909 | ||
8440e22e | 2910 | static void coroutine_fn v9fs_link(void *opaque) |
b2c224be | 2911 | { |
ff06030f | 2912 | V9fsPDU *pdu = opaque; |
b2c224be VJ |
2913 | int32_t dfid, oldfid; |
2914 | V9fsFidState *dfidp, *oldfidp; | |
3a93113a | 2915 | V9fsString name; |
b2c224be VJ |
2916 | size_t offset = 7; |
2917 | int err = 0; | |
2918 | ||
ddca7f86 MK |
2919 | v9fs_string_init(&name); |
2920 | err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); | |
2921 | if (err < 0) { | |
2922 | goto out_nofid; | |
2923 | } | |
c572f23a | 2924 | trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); |
b2c224be | 2925 | |
fff39a7a GK |
2926 | if (name_is_illegal(name.data)) { |
2927 | err = -ENOENT; | |
2928 | goto out_nofid; | |
2929 | } | |
2930 | ||
805b5d98 GK |
2931 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
2932 | err = -EEXIST; | |
2933 | goto out_nofid; | |
2934 | } | |
2935 | ||
bccacf6c | 2936 | dfidp = get_fid(pdu, dfid); |
b2c224be | 2937 | if (dfidp == NULL) { |
ffd66876 | 2938 | err = -ENOENT; |
84dfb926 | 2939 | goto out_nofid; |
b2c224be VJ |
2940 | } |
2941 | ||
bccacf6c | 2942 | oldfidp = get_fid(pdu, oldfid); |
b2c224be | 2943 | if (oldfidp == NULL) { |
ffd66876 | 2944 | err = -ENOENT; |
b2c224be VJ |
2945 | goto out; |
2946 | } | |
bccacf6c | 2947 | err = v9fs_co_link(pdu, oldfidp, dfidp, &name); |
ffd66876 VJ |
2948 | if (!err) { |
2949 | err = offset; | |
b2c224be | 2950 | } |
4c158678 | 2951 | put_fid(pdu, oldfidp); |
b2c224be | 2952 | out: |
bccacf6c | 2953 | put_fid(pdu, dfidp); |
84dfb926 | 2954 | out_nofid: |
b2c224be | 2955 | v9fs_string_free(&name); |
dc295f83 | 2956 | pdu_complete(pdu, err); |
b2c224be VJ |
2957 | } |
2958 | ||
532decb7 | 2959 | /* Only works with path name based fid */ |
8440e22e | 2960 | static void coroutine_fn v9fs_remove(void *opaque) |
9f107513 | 2961 | { |
5bae1900 | 2962 | int32_t fid; |
5bae1900 | 2963 | int err = 0; |
ae1ef571 VJ |
2964 | size_t offset = 7; |
2965 | V9fsFidState *fidp; | |
2966 | V9fsPDU *pdu = opaque; | |
5bae1900 | 2967 | |
ddca7f86 MK |
2968 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
2969 | if (err < 0) { | |
2970 | goto out_nofid; | |
2971 | } | |
c572f23a | 2972 | trace_v9fs_remove(pdu->tag, pdu->id, fid); |
5bae1900 | 2973 | |
bccacf6c | 2974 | fidp = get_fid(pdu, fid); |
ae1ef571 | 2975 | if (fidp == NULL) { |
5bae1900 | 2976 | err = -EINVAL; |
84dfb926 | 2977 | goto out_nofid; |
9f107513 | 2978 | } |
532decb7 | 2979 | /* if fs driver is not path based, return EOPNOTSUPP */ |
c98f1d4a | 2980 | if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
532decb7 AK |
2981 | err = -EOPNOTSUPP; |
2982 | goto out_err; | |
2983 | } | |
7a462745 AK |
2984 | /* |
2985 | * IF the file is unlinked, we cannot reopen | |
2986 | * the file later. So don't reclaim fd | |
2987 | */ | |
bccacf6c | 2988 | err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); |
7a462745 AK |
2989 | if (err < 0) { |
2990 | goto out_err; | |
2991 | } | |
bccacf6c | 2992 | err = v9fs_co_remove(pdu, &fidp->path); |
ae1ef571 VJ |
2993 | if (!err) { |
2994 | err = offset; | |
2995 | } | |
7a462745 | 2996 | out_err: |
ae1ef571 | 2997 | /* For TREMOVE we need to clunk the fid even on failed remove */ |
84dfb926 | 2998 | clunk_fid(pdu->s, fidp->fid); |
bccacf6c | 2999 | put_fid(pdu, fidp); |
84dfb926 | 3000 | out_nofid: |
dc295f83 | 3001 | pdu_complete(pdu, err); |
9f107513 AL |
3002 | } |
3003 | ||
8440e22e | 3004 | static void coroutine_fn v9fs_unlinkat(void *opaque) |
7834cf77 AK |
3005 | { |
3006 | int err = 0; | |
3007 | V9fsString name; | |
67e87345 | 3008 | int32_t dfid, flags, rflags = 0; |
7834cf77 | 3009 | size_t offset = 7; |
2289be19 | 3010 | V9fsPath path; |
7834cf77 AK |
3011 | V9fsFidState *dfidp; |
3012 | V9fsPDU *pdu = opaque; | |
7834cf77 | 3013 | |
ddca7f86 MK |
3014 | v9fs_string_init(&name); |
3015 | err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); | |
3016 | if (err < 0) { | |
3017 | goto out_nofid; | |
3018 | } | |
fff39a7a GK |
3019 | |
3020 | if (name_is_illegal(name.data)) { | |
3021 | err = -ENOENT; | |
3022 | goto out_nofid; | |
3023 | } | |
3024 | ||
805b5d98 GK |
3025 | if (!strcmp(".", name.data)) { |
3026 | err = -EINVAL; | |
3027 | goto out_nofid; | |
3028 | } | |
3029 | ||
3030 | if (!strcmp("..", name.data)) { | |
3031 | err = -ENOTEMPTY; | |
3032 | goto out_nofid; | |
3033 | } | |
3034 | ||
67e87345 KF |
3035 | if (flags & ~P9_DOTL_AT_REMOVEDIR) { |
3036 | err = -EINVAL; | |
3037 | goto out_nofid; | |
3038 | } | |
3039 | ||
3040 | if (flags & P9_DOTL_AT_REMOVEDIR) { | |
3041 | rflags |= AT_REMOVEDIR; | |
3042 | } | |
3043 | ||
bccacf6c | 3044 | dfidp = get_fid(pdu, dfid); |
7834cf77 AK |
3045 | if (dfidp == NULL) { |
3046 | err = -EINVAL; | |
3047 | goto out_nofid; | |
3048 | } | |
7834cf77 AK |
3049 | /* |
3050 | * IF the file is unlinked, we cannot reopen | |
3051 | * the file later. So don't reclaim fd | |
3052 | */ | |
2289be19 | 3053 | v9fs_path_init(&path); |
bccacf6c | 3054 | err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); |
2289be19 AK |
3055 | if (err < 0) { |
3056 | goto out_err; | |
3057 | } | |
bccacf6c | 3058 | err = v9fs_mark_fids_unreclaim(pdu, &path); |
7834cf77 AK |
3059 | if (err < 0) { |
3060 | goto out_err; | |
3061 | } | |
67e87345 | 3062 | err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); |
7834cf77 AK |
3063 | if (!err) { |
3064 | err = offset; | |
3065 | } | |
3066 | out_err: | |
bccacf6c | 3067 | put_fid(pdu, dfidp); |
2289be19 | 3068 | v9fs_path_free(&path); |
7834cf77 | 3069 | out_nofid: |
dc295f83 | 3070 | pdu_complete(pdu, err); |
7834cf77 AK |
3071 | v9fs_string_free(&name); |
3072 | } | |
3073 | ||
2289be19 AK |
3074 | |
3075 | /* Only works with path name based fid */ | |
8440e22e GK |
3076 | static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, |
3077 | int32_t newdirfid, | |
3078 | V9fsString *name) | |
8cf89e00 | 3079 | { |
c7b4b0b3 | 3080 | int err = 0; |
2289be19 AK |
3081 | V9fsPath new_path; |
3082 | V9fsFidState *tfidp; | |
bccacf6c | 3083 | V9fsState *s = pdu->s; |
84dfb926 | 3084 | V9fsFidState *dirfidp = NULL; |
8cf89e00 | 3085 | |
2289be19 | 3086 | v9fs_path_init(&new_path); |
930b1e17 | 3087 | if (newdirfid != -1) { |
bccacf6c | 3088 | dirfidp = get_fid(pdu, newdirfid); |
c7b4b0b3 | 3089 | if (dirfidp == NULL) { |
b858e80a | 3090 | return -ENOENT; |
c7b4b0b3 | 3091 | } |
49dd946b GK |
3092 | if (fidp->fid_type != P9_FID_NONE) { |
3093 | err = -EINVAL; | |
3094 | goto out; | |
3095 | } | |
4fa62005 GK |
3096 | err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); |
3097 | if (err < 0) { | |
3098 | goto out; | |
3099 | } | |
c7b4b0b3 | 3100 | } else { |
4d8bc733 JD |
3101 | char *dir_name = g_path_get_dirname(fidp->path.data); |
3102 | V9fsPath dir_path; | |
3103 | ||
3104 | v9fs_path_init(&dir_path); | |
3105 | v9fs_path_sprintf(&dir_path, "%s", dir_name); | |
3106 | g_free(dir_name); | |
3107 | ||
3108 | err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); | |
3109 | v9fs_path_free(&dir_path); | |
4fa62005 GK |
3110 | if (err < 0) { |
3111 | goto out; | |
3112 | } | |
c7b4b0b3 | 3113 | } |
bccacf6c | 3114 | err = v9fs_co_rename(pdu, &fidp->path, &new_path); |
2289be19 AK |
3115 | if (err < 0) { |
3116 | goto out; | |
3117 | } | |
3118 | /* | |
3119 | * Fixup fid's pointing to the old name to | |
3120 | * start pointing to the new name | |
3121 | */ | |
3122 | for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { | |
3123 | if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { | |
3124 | /* replace the name */ | |
3125 | v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); | |
8cf89e00 AL |
3126 | } |
3127 | } | |
c7b4b0b3 | 3128 | out: |
84dfb926 | 3129 | if (dirfidp) { |
bccacf6c | 3130 | put_fid(pdu, dirfidp); |
84dfb926 | 3131 | } |
2289be19 | 3132 | v9fs_path_free(&new_path); |
c7b4b0b3 MK |
3133 | return err; |
3134 | } | |
3135 | ||
532decb7 | 3136 | /* Only works with path name based fid */ |
8440e22e | 3137 | static void coroutine_fn v9fs_rename(void *opaque) |
c7b4b0b3 MK |
3138 | { |
3139 | int32_t fid; | |
c7b4b0b3 | 3140 | ssize_t err = 0; |
930b1e17 AK |
3141 | size_t offset = 7; |
3142 | V9fsString name; | |
3143 | int32_t newdirfid; | |
3144 | V9fsFidState *fidp; | |
3145 | V9fsPDU *pdu = opaque; | |
3146 | V9fsState *s = pdu->s; | |
c7b4b0b3 | 3147 | |
ddca7f86 MK |
3148 | v9fs_string_init(&name); |
3149 | err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); | |
3150 | if (err < 0) { | |
3151 | goto out_nofid; | |
3152 | } | |
fff39a7a GK |
3153 | |
3154 | if (name_is_illegal(name.data)) { | |
3155 | err = -ENOENT; | |
3156 | goto out_nofid; | |
3157 | } | |
3158 | ||
805b5d98 GK |
3159 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
3160 | err = -EISDIR; | |
3161 | goto out_nofid; | |
3162 | } | |
3163 | ||
bccacf6c | 3164 | fidp = get_fid(pdu, fid); |
930b1e17 | 3165 | if (fidp == NULL) { |
c7b4b0b3 | 3166 | err = -ENOENT; |
84dfb926 | 3167 | goto out_nofid; |
c7b4b0b3 | 3168 | } |
49dd946b GK |
3169 | if (fidp->fid_type != P9_FID_NONE) { |
3170 | err = -EINVAL; | |
3171 | goto out; | |
3172 | } | |
532decb7 | 3173 | /* if fs driver is not path based, return EOPNOTSUPP */ |
c98f1d4a | 3174 | if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
532decb7 AK |
3175 | err = -EOPNOTSUPP; |
3176 | goto out; | |
3177 | } | |
3178 | v9fs_path_write_lock(s); | |
bccacf6c | 3179 | err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); |
532decb7 | 3180 | v9fs_path_unlock(s); |
930b1e17 AK |
3181 | if (!err) { |
3182 | err = offset; | |
3183 | } | |
532decb7 | 3184 | out: |
bccacf6c | 3185 | put_fid(pdu, fidp); |
84dfb926 | 3186 | out_nofid: |
dc295f83 | 3187 | pdu_complete(pdu, err); |
930b1e17 | 3188 | v9fs_string_free(&name); |
c7b4b0b3 MK |
3189 | } |
3190 | ||
4fa62005 GK |
3191 | static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, |
3192 | V9fsString *old_name, | |
3193 | V9fsPath *newdir, | |
3194 | V9fsString *new_name) | |
2289be19 AK |
3195 | { |
3196 | V9fsFidState *tfidp; | |
3197 | V9fsPath oldpath, newpath; | |
bccacf6c | 3198 | V9fsState *s = pdu->s; |
4fa62005 | 3199 | int err; |
2289be19 AK |
3200 | |
3201 | v9fs_path_init(&oldpath); | |
3202 | v9fs_path_init(&newpath); | |
4fa62005 GK |
3203 | err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); |
3204 | if (err < 0) { | |
3205 | goto out; | |
3206 | } | |
3207 | err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); | |
3208 | if (err < 0) { | |
3209 | goto out; | |
3210 | } | |
2289be19 AK |
3211 | |
3212 | /* | |
3213 | * Fixup fid's pointing to the old name to | |
3214 | * start pointing to the new name | |
3215 | */ | |
3216 | for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { | |
3217 | if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { | |
3218 | /* replace the name */ | |
3219 | v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); | |
3220 | } | |
3221 | } | |
4fa62005 | 3222 | out: |
2289be19 AK |
3223 | v9fs_path_free(&oldpath); |
3224 | v9fs_path_free(&newpath); | |
4fa62005 | 3225 | return err; |
2289be19 AK |
3226 | } |
3227 | ||
8440e22e GK |
3228 | static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, |
3229 | V9fsString *old_name, | |
3230 | int32_t newdirfid, | |
3231 | V9fsString *new_name) | |
89bf6593 AK |
3232 | { |
3233 | int err = 0; | |
bccacf6c | 3234 | V9fsState *s = pdu->s; |
89bf6593 AK |
3235 | V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; |
3236 | ||
bccacf6c | 3237 | olddirfidp = get_fid(pdu, olddirfid); |
89bf6593 AK |
3238 | if (olddirfidp == NULL) { |
3239 | err = -ENOENT; | |
3240 | goto out; | |
3241 | } | |
89bf6593 | 3242 | if (newdirfid != -1) { |
bccacf6c | 3243 | newdirfidp = get_fid(pdu, newdirfid); |
89bf6593 AK |
3244 | if (newdirfidp == NULL) { |
3245 | err = -ENOENT; | |
3246 | goto out; | |
3247 | } | |
89bf6593 | 3248 | } else { |
bccacf6c | 3249 | newdirfidp = get_fid(pdu, olddirfid); |
89bf6593 AK |
3250 | } |
3251 | ||
bccacf6c | 3252 | err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, |
2289be19 AK |
3253 | &newdirfidp->path, new_name); |
3254 | if (err < 0) { | |
3255 | goto out; | |
89bf6593 | 3256 | } |
c98f1d4a | 3257 | if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { |
532decb7 | 3258 | /* Only for path based fid we need to do the below fixup */ |
4fa62005 GK |
3259 | err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, |
3260 | &newdirfidp->path, new_name); | |
532decb7 | 3261 | } |
89bf6593 AK |
3262 | out: |
3263 | if (olddirfidp) { | |
bccacf6c | 3264 | put_fid(pdu, olddirfidp); |
89bf6593 AK |
3265 | } |
3266 | if (newdirfidp) { | |
bccacf6c | 3267 | put_fid(pdu, newdirfidp); |
89bf6593 | 3268 | } |
89bf6593 AK |
3269 | return err; |
3270 | } | |
3271 | ||
8440e22e | 3272 | static void coroutine_fn v9fs_renameat(void *opaque) |
89bf6593 AK |
3273 | { |
3274 | ssize_t err = 0; | |
3275 | size_t offset = 7; | |
3276 | V9fsPDU *pdu = opaque; | |
3277 | V9fsState *s = pdu->s; | |
3278 | int32_t olddirfid, newdirfid; | |
3279 | V9fsString old_name, new_name; | |
3280 | ||
ddca7f86 MK |
3281 | v9fs_string_init(&old_name); |
3282 | v9fs_string_init(&new_name); | |
3283 | err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, | |
3284 | &old_name, &newdirfid, &new_name); | |
3285 | if (err < 0) { | |
3286 | goto out_err; | |
3287 | } | |
89bf6593 | 3288 | |
fff39a7a GK |
3289 | if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { |
3290 | err = -ENOENT; | |
3291 | goto out_err; | |
3292 | } | |
3293 | ||
805b5d98 GK |
3294 | if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || |
3295 | !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { | |
3296 | err = -EISDIR; | |
3297 | goto out_err; | |
3298 | } | |
3299 | ||
532decb7 | 3300 | v9fs_path_write_lock(s); |
bccacf6c AK |
3301 | err = v9fs_complete_renameat(pdu, olddirfid, |
3302 | &old_name, newdirfid, &new_name); | |
532decb7 | 3303 | v9fs_path_unlock(s); |
89bf6593 AK |
3304 | if (!err) { |
3305 | err = offset; | |
3306 | } | |
ddca7f86 MK |
3307 | |
3308 | out_err: | |
dc295f83 | 3309 | pdu_complete(pdu, err); |
89bf6593 AK |
3310 | v9fs_string_free(&old_name); |
3311 | v9fs_string_free(&new_name); | |
3312 | } | |
3313 | ||
8440e22e | 3314 | static void coroutine_fn v9fs_wstat(void *opaque) |
8cf89e00 | 3315 | { |
b81d685e AK |
3316 | int32_t fid; |
3317 | int err = 0; | |
3318 | int16_t unused; | |
3319 | V9fsStat v9stat; | |
3320 | size_t offset = 7; | |
3321 | struct stat stbuf; | |
3322 | V9fsFidState *fidp; | |
3323 | V9fsPDU *pdu = opaque; | |
1d203986 | 3324 | V9fsState *s = pdu->s; |
8cf89e00 | 3325 | |
ddca7f86 MK |
3326 | v9fs_stat_init(&v9stat); |
3327 | err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); | |
3328 | if (err < 0) { | |
3329 | goto out_nofid; | |
3330 | } | |
c572f23a HPB |
3331 | trace_v9fs_wstat(pdu->tag, pdu->id, fid, |
3332 | v9stat.mode, v9stat.atime, v9stat.mtime); | |
84dfb926 | 3333 | |
bccacf6c | 3334 | fidp = get_fid(pdu, fid); |
b81d685e AK |
3335 | if (fidp == NULL) { |
3336 | err = -EINVAL; | |
84dfb926 | 3337 | goto out_nofid; |
8cf89e00 | 3338 | } |
b81d685e AK |
3339 | /* do we need to sync the file? */ |
3340 | if (donttouch_stat(&v9stat)) { | |
bccacf6c | 3341 | err = v9fs_co_fsync(pdu, fidp, 0); |
8cf89e00 AL |
3342 | goto out; |
3343 | } | |
b81d685e AK |
3344 | if (v9stat.mode != -1) { |
3345 | uint32_t v9_mode; | |
bccacf6c | 3346 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
b81d685e AK |
3347 | if (err < 0) { |
3348 | goto out; | |
3349 | } | |
3350 | v9_mode = stat_to_v9mode(&stbuf); | |
3351 | if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != | |
3352 | (v9_mode & P9_STAT_MODE_TYPE_BITS)) { | |
3353 | /* Attempting to change the type */ | |
3354 | err = -EIO; | |
3355 | goto out; | |
3356 | } | |
bccacf6c | 3357 | err = v9fs_co_chmod(pdu, &fidp->path, |
b81d685e AK |
3358 | v9mode_to_mode(v9stat.mode, |
3359 | &v9stat.extension)); | |
3360 | if (err < 0) { | |
3361 | goto out; | |
3362 | } | |
3363 | } | |
3364 | if (v9stat.mtime != -1 || v9stat.atime != -1) { | |
8fc39ae4 | 3365 | struct timespec times[2]; |
b81d685e AK |
3366 | if (v9stat.atime != -1) { |
3367 | times[0].tv_sec = v9stat.atime; | |
8fc39ae4 SK |
3368 | times[0].tv_nsec = 0; |
3369 | } else { | |
3370 | times[0].tv_nsec = UTIME_OMIT; | |
3371 | } | |
b81d685e AK |
3372 | if (v9stat.mtime != -1) { |
3373 | times[1].tv_sec = v9stat.mtime; | |
8fc39ae4 SK |
3374 | times[1].tv_nsec = 0; |
3375 | } else { | |
3376 | times[1].tv_nsec = UTIME_OMIT; | |
3377 | } | |
bccacf6c | 3378 | err = v9fs_co_utimensat(pdu, &fidp->path, times); |
b81d685e AK |
3379 | if (err < 0) { |
3380 | goto out; | |
8cf89e00 AL |
3381 | } |
3382 | } | |
b81d685e | 3383 | if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { |
bccacf6c | 3384 | err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); |
b81d685e | 3385 | if (err < 0) { |
8cf89e00 | 3386 | goto out; |
b81d685e | 3387 | } |
8cf89e00 | 3388 | } |
b81d685e | 3389 | if (v9stat.name.size != 0) { |
1d203986 | 3390 | v9fs_path_write_lock(s); |
bccacf6c | 3391 | err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); |
1d203986 | 3392 | v9fs_path_unlock(s); |
b81d685e AK |
3393 | if (err < 0) { |
3394 | goto out; | |
3395 | } | |
8cf89e00 | 3396 | } |
b81d685e | 3397 | if (v9stat.length != -1) { |
bccacf6c | 3398 | err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); |
b81d685e AK |
3399 | if (err < 0) { |
3400 | goto out; | |
3401 | } | |
8cf89e00 | 3402 | } |
b81d685e | 3403 | err = offset; |
8cf89e00 | 3404 | out: |
bccacf6c | 3405 | put_fid(pdu, fidp); |
84dfb926 | 3406 | out_nofid: |
b81d685e | 3407 | v9fs_stat_free(&v9stat); |
dc295f83 | 3408 | pdu_complete(pdu, err); |
9f107513 AL |
3409 | } |
3410 | ||
88a4763e AK |
3411 | static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) |
3412 | { | |
3413 | uint32_t f_type; | |
3414 | uint32_t f_bsize; | |
3415 | uint64_t f_blocks; | |
3416 | uint64_t f_bfree; | |
3417 | uint64_t f_bavail; | |
3418 | uint64_t f_files; | |
3419 | uint64_t f_ffree; | |
3420 | uint64_t fsid_val; | |
3421 | uint32_t f_namelen; | |
3422 | size_t offset = 7; | |
5e94c103 MK |
3423 | int32_t bsize_factor; |
3424 | ||
5e94c103 MK |
3425 | /* |
3426 | * compute bsize factor based on host file system block size | |
3427 | * and client msize | |
3428 | */ | |
88a4763e | 3429 | bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize; |
5e94c103 MK |
3430 | if (!bsize_factor) { |
3431 | bsize_factor = 1; | |
3432 | } | |
88a4763e AK |
3433 | f_type = stbuf->f_type; |
3434 | f_bsize = stbuf->f_bsize; | |
3435 | f_bsize *= bsize_factor; | |
5e94c103 MK |
3436 | /* |
3437 | * f_bsize is adjusted(multiplied) by bsize factor, so we need to | |
3438 | * adjust(divide) the number of blocks, free blocks and available | |
3439 | * blocks by bsize factor | |
3440 | */ | |
88a4763e AK |
3441 | f_blocks = stbuf->f_blocks/bsize_factor; |
3442 | f_bfree = stbuf->f_bfree/bsize_factor; | |
3443 | f_bavail = stbuf->f_bavail/bsize_factor; | |
3444 | f_files = stbuf->f_files; | |
3445 | f_ffree = stbuf->f_ffree; | |
3446 | fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | | |
3447 | (unsigned long long)stbuf->f_fsid.__val[1] << 32; | |
3448 | f_namelen = stbuf->f_namelen; | |
be940c87 | 3449 | |
88a4763e AK |
3450 | return pdu_marshal(pdu, offset, "ddqqqqqqd", |
3451 | f_type, f_bsize, f_blocks, f_bfree, | |
3452 | f_bavail, f_files, f_ffree, | |
3453 | fsid_val, f_namelen); | |
be940c87 MK |
3454 | } |
3455 | ||
8440e22e | 3456 | static void coroutine_fn v9fs_statfs(void *opaque) |
be940c87 | 3457 | { |
88a4763e AK |
3458 | int32_t fid; |
3459 | ssize_t retval = 0; | |
3460 | size_t offset = 7; | |
3461 | V9fsFidState *fidp; | |
3462 | struct statfs stbuf; | |
ff06030f VJ |
3463 | V9fsPDU *pdu = opaque; |
3464 | V9fsState *s = pdu->s; | |
be940c87 | 3465 | |
ddca7f86 MK |
3466 | retval = pdu_unmarshal(pdu, offset, "d", &fid); |
3467 | if (retval < 0) { | |
3468 | goto out_nofid; | |
3469 | } | |
bccacf6c | 3470 | fidp = get_fid(pdu, fid); |
88a4763e AK |
3471 | if (fidp == NULL) { |
3472 | retval = -ENOENT; | |
84dfb926 | 3473 | goto out_nofid; |
be940c87 | 3474 | } |
bccacf6c | 3475 | retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); |
88a4763e AK |
3476 | if (retval < 0) { |
3477 | goto out; | |
3478 | } | |
ddca7f86 MK |
3479 | retval = v9fs_fill_statfs(s, pdu, &stbuf); |
3480 | if (retval < 0) { | |
3481 | goto out; | |
3482 | } | |
3483 | retval += offset; | |
be940c87 | 3484 | out: |
bccacf6c | 3485 | put_fid(pdu, fidp); |
84dfb926 | 3486 | out_nofid: |
dc295f83 | 3487 | pdu_complete(pdu, retval); |
be940c87 MK |
3488 | } |
3489 | ||
8440e22e | 3490 | static void coroutine_fn v9fs_mknod(void *opaque) |
5268cecc | 3491 | { |
1b733fed AK |
3492 | |
3493 | int mode; | |
3494 | gid_t gid; | |
5268cecc | 3495 | int32_t fid; |
1b733fed | 3496 | V9fsQID qid; |
5268cecc | 3497 | int err = 0; |
5268cecc | 3498 | int major, minor; |
1b733fed AK |
3499 | size_t offset = 7; |
3500 | V9fsString name; | |
3501 | struct stat stbuf; | |
1b733fed AK |
3502 | V9fsFidState *fidp; |
3503 | V9fsPDU *pdu = opaque; | |
5268cecc | 3504 | |
ddca7f86 MK |
3505 | v9fs_string_init(&name); |
3506 | err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, | |
3507 | &major, &minor, &gid); | |
3508 | if (err < 0) { | |
3509 | goto out_nofid; | |
3510 | } | |
c572f23a | 3511 | trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); |
5268cecc | 3512 | |
fff39a7a GK |
3513 | if (name_is_illegal(name.data)) { |
3514 | err = -ENOENT; | |
3515 | goto out_nofid; | |
3516 | } | |
3517 | ||
805b5d98 GK |
3518 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
3519 | err = -EEXIST; | |
3520 | goto out_nofid; | |
3521 | } | |
3522 | ||
bccacf6c | 3523 | fidp = get_fid(pdu, fid); |
5268cecc MK |
3524 | if (fidp == NULL) { |
3525 | err = -ENOENT; | |
84dfb926 | 3526 | goto out_nofid; |
5268cecc | 3527 | } |
bccacf6c | 3528 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, |
02cb7f3a | 3529 | makedev(major, minor), mode, &stbuf); |
1b733fed AK |
3530 | if (err < 0) { |
3531 | goto out; | |
3532 | } | |
3b5ee9e8 AM |
3533 | err = stat_to_qid(pdu, &stbuf, &qid); |
3534 | if (err < 0) { | |
3535 | goto out; | |
3536 | } | |
ddca7f86 MK |
3537 | err = pdu_marshal(pdu, offset, "Q", &qid); |
3538 | if (err < 0) { | |
3539 | goto out; | |
3540 | } | |
3541 | err += offset; | |
7999f7e1 AK |
3542 | trace_v9fs_mknod_return(pdu->tag, pdu->id, |
3543 | qid.type, qid.version, qid.path); | |
5268cecc | 3544 | out: |
bccacf6c | 3545 | put_fid(pdu, fidp); |
84dfb926 | 3546 | out_nofid: |
dc295f83 | 3547 | pdu_complete(pdu, err); |
1b733fed | 3548 | v9fs_string_free(&name); |
5268cecc MK |
3549 | } |
3550 | ||
82cc3ee8 MK |
3551 | /* |
3552 | * Implement posix byte range locking code | |
3553 | * Server side handling of locking code is very simple, because 9p server in | |
3554 | * QEMU can handle only one client. And most of the lock handling | |
3555 | * (like conflict, merging) etc is done by the VFS layer itself, so no need to | |
3556 | * do any thing in * qemu 9p server side lock code path. | |
3557 | * So when a TLOCK request comes, always return success | |
3558 | */ | |
8440e22e | 3559 | static void coroutine_fn v9fs_lock(void *opaque) |
82cc3ee8 | 3560 | { |
ddca7f86 | 3561 | V9fsFlock flock; |
0c27bf2a AK |
3562 | size_t offset = 7; |
3563 | struct stat stbuf; | |
3564 | V9fsFidState *fidp; | |
3565 | int32_t fid, err = 0; | |
ff06030f | 3566 | V9fsPDU *pdu = opaque; |
82cc3ee8 | 3567 | |
ddca7f86 MK |
3568 | v9fs_string_init(&flock.client_id); |
3569 | err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, | |
3570 | &flock.flags, &flock.start, &flock.length, | |
3571 | &flock.proc_id, &flock.client_id); | |
3572 | if (err < 0) { | |
3573 | goto out_nofid; | |
3574 | } | |
c572f23a | 3575 | trace_v9fs_lock(pdu->tag, pdu->id, fid, |
ddca7f86 | 3576 | flock.type, flock.start, flock.length); |
c572f23a | 3577 | |
82cc3ee8 MK |
3578 | |
3579 | /* We support only block flag now (that too ignored currently) */ | |
ddca7f86 | 3580 | if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { |
82cc3ee8 | 3581 | err = -EINVAL; |
84dfb926 | 3582 | goto out_nofid; |
82cc3ee8 | 3583 | } |
bccacf6c | 3584 | fidp = get_fid(pdu, fid); |
0c27bf2a | 3585 | if (fidp == NULL) { |
82cc3ee8 | 3586 | err = -ENOENT; |
84dfb926 | 3587 | goto out_nofid; |
82cc3ee8 | 3588 | } |
cc720ddb | 3589 | err = v9fs_co_fstat(pdu, fidp, &stbuf); |
82cc3ee8 | 3590 | if (err < 0) { |
82cc3ee8 MK |
3591 | goto out; |
3592 | } | |
4bae2b39 PB |
3593 | err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); |
3594 | if (err < 0) { | |
3595 | goto out; | |
3596 | } | |
3597 | err += offset; | |
3598 | trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); | |
82cc3ee8 | 3599 | out: |
bccacf6c | 3600 | put_fid(pdu, fidp); |
84dfb926 | 3601 | out_nofid: |
dc295f83 | 3602 | pdu_complete(pdu, err); |
ddca7f86 | 3603 | v9fs_string_free(&flock.client_id); |
82cc3ee8 MK |
3604 | } |
3605 | ||
8f354003 MK |
3606 | /* |
3607 | * When a TGETLOCK request comes, always return success because all lock | |
3608 | * handling is done by client's VFS layer. | |
3609 | */ | |
8440e22e | 3610 | static void coroutine_fn v9fs_getlock(void *opaque) |
8f354003 | 3611 | { |
e4e414a4 AK |
3612 | size_t offset = 7; |
3613 | struct stat stbuf; | |
3614 | V9fsFidState *fidp; | |
ddca7f86 | 3615 | V9fsGetlock glock; |
e4e414a4 | 3616 | int32_t fid, err = 0; |
ff06030f | 3617 | V9fsPDU *pdu = opaque; |
8f354003 | 3618 | |
ddca7f86 MK |
3619 | v9fs_string_init(&glock.client_id); |
3620 | err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, | |
3621 | &glock.start, &glock.length, &glock.proc_id, | |
3622 | &glock.client_id); | |
3623 | if (err < 0) { | |
3624 | goto out_nofid; | |
3625 | } | |
c572f23a | 3626 | trace_v9fs_getlock(pdu->tag, pdu->id, fid, |
ddca7f86 | 3627 | glock.type, glock.start, glock.length); |
c572f23a | 3628 | |
bccacf6c | 3629 | fidp = get_fid(pdu, fid); |
e4e414a4 | 3630 | if (fidp == NULL) { |
8f354003 | 3631 | err = -ENOENT; |
84dfb926 | 3632 | goto out_nofid; |
8f354003 | 3633 | } |
cc720ddb | 3634 | err = v9fs_co_fstat(pdu, fidp, &stbuf); |
8f354003 | 3635 | if (err < 0) { |
8f354003 MK |
3636 | goto out; |
3637 | } | |
ddca7f86 MK |
3638 | glock.type = P9_LOCK_TYPE_UNLCK; |
3639 | err = pdu_marshal(pdu, offset, "bqqds", glock.type, | |
3640 | glock.start, glock.length, glock.proc_id, | |
3641 | &glock.client_id); | |
3642 | if (err < 0) { | |
3643 | goto out; | |
3644 | } | |
3645 | err += offset; | |
3646 | trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, | |
3647 | glock.length, glock.proc_id); | |
8f354003 | 3648 | out: |
bccacf6c | 3649 | put_fid(pdu, fidp); |
84dfb926 | 3650 | out_nofid: |
dc295f83 | 3651 | pdu_complete(pdu, err); |
ddca7f86 | 3652 | v9fs_string_free(&glock.client_id); |
8f354003 MK |
3653 | } |
3654 | ||
8440e22e | 3655 | static void coroutine_fn v9fs_mkdir(void *opaque) |
b67592ea | 3656 | { |
ff06030f | 3657 | V9fsPDU *pdu = opaque; |
e84861f7 | 3658 | size_t offset = 7; |
b67592ea | 3659 | int32_t fid; |
e84861f7 | 3660 | struct stat stbuf; |
e84861f7 | 3661 | V9fsQID qid; |
02cb7f3a | 3662 | V9fsString name; |
b67592ea MK |
3663 | V9fsFidState *fidp; |
3664 | gid_t gid; | |
3665 | int mode; | |
e84861f7 | 3666 | int err = 0; |
b67592ea | 3667 | |
ddca7f86 MK |
3668 | v9fs_string_init(&name); |
3669 | err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); | |
3670 | if (err < 0) { | |
3671 | goto out_nofid; | |
3672 | } | |
c572f23a HPB |
3673 | trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); |
3674 | ||
fff39a7a GK |
3675 | if (name_is_illegal(name.data)) { |
3676 | err = -ENOENT; | |
3677 | goto out_nofid; | |
3678 | } | |
3679 | ||
805b5d98 GK |
3680 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
3681 | err = -EEXIST; | |
3682 | goto out_nofid; | |
3683 | } | |
3684 | ||
bccacf6c | 3685 | fidp = get_fid(pdu, fid); |
b67592ea MK |
3686 | if (fidp == NULL) { |
3687 | err = -ENOENT; | |
84dfb926 | 3688 | goto out_nofid; |
b67592ea | 3689 | } |
bccacf6c | 3690 | err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); |
e84861f7 VJ |
3691 | if (err < 0) { |
3692 | goto out; | |
3693 | } | |
3b5ee9e8 AM |
3694 | err = stat_to_qid(pdu, &stbuf, &qid); |
3695 | if (err < 0) { | |
3696 | goto out; | |
3697 | } | |
ddca7f86 MK |
3698 | err = pdu_marshal(pdu, offset, "Q", &qid); |
3699 | if (err < 0) { | |
3700 | goto out; | |
3701 | } | |
3702 | err += offset; | |
7999f7e1 AK |
3703 | trace_v9fs_mkdir_return(pdu->tag, pdu->id, |
3704 | qid.type, qid.version, qid.path, err); | |
b67592ea | 3705 | out: |
bccacf6c | 3706 | put_fid(pdu, fidp); |
84dfb926 | 3707 | out_nofid: |
dc295f83 | 3708 | pdu_complete(pdu, err); |
e84861f7 | 3709 | v9fs_string_free(&name); |
b67592ea MK |
3710 | } |
3711 | ||
8440e22e | 3712 | static void coroutine_fn v9fs_xattrwalk(void *opaque) |
fa32ef88 | 3713 | { |
670185a6 AK |
3714 | int64_t size; |
3715 | V9fsString name; | |
fa32ef88 | 3716 | ssize_t err = 0; |
670185a6 | 3717 | size_t offset = 7; |
fa32ef88 | 3718 | int32_t fid, newfid; |
670185a6 | 3719 | V9fsFidState *file_fidp; |
84dfb926 | 3720 | V9fsFidState *xattr_fidp = NULL; |
670185a6 AK |
3721 | V9fsPDU *pdu = opaque; |
3722 | V9fsState *s = pdu->s; | |
fa32ef88 | 3723 | |
ddca7f86 MK |
3724 | v9fs_string_init(&name); |
3725 | err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); | |
3726 | if (err < 0) { | |
3727 | goto out_nofid; | |
3728 | } | |
c572f23a HPB |
3729 | trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); |
3730 | ||
bccacf6c | 3731 | file_fidp = get_fid(pdu, fid); |
670185a6 | 3732 | if (file_fidp == NULL) { |
fa32ef88 | 3733 | err = -ENOENT; |
84dfb926 | 3734 | goto out_nofid; |
fa32ef88 | 3735 | } |
670185a6 AK |
3736 | xattr_fidp = alloc_fid(s, newfid); |
3737 | if (xattr_fidp == NULL) { | |
fa32ef88 AK |
3738 | err = -EINVAL; |
3739 | goto out; | |
3740 | } | |
2289be19 | 3741 | v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); |
ba42ebb8 | 3742 | if (!v9fs_string_size(&name)) { |
fa32ef88 AK |
3743 | /* |
3744 | * listxattr request. Get the size first | |
3745 | */ | |
bccacf6c | 3746 | size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); |
670185a6 AK |
3747 | if (size < 0) { |
3748 | err = size; | |
84dfb926 | 3749 | clunk_fid(s, xattr_fidp->fid); |
670185a6 | 3750 | goto out; |
fa32ef88 | 3751 | } |
670185a6 AK |
3752 | /* |
3753 | * Read the xattr value | |
3754 | */ | |
3755 | xattr_fidp->fs.xattr.len = size; | |
3756 | xattr_fidp->fid_type = P9_FID_XATTR; | |
dd28fbbc | 3757 | xattr_fidp->fs.xattr.xattrwalk_fid = true; |
a647502c | 3758 | xattr_fidp->fs.xattr.value = g_malloc0(size); |
670185a6 | 3759 | if (size) { |
bccacf6c | 3760 | err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, |
670185a6 AK |
3761 | xattr_fidp->fs.xattr.value, |
3762 | xattr_fidp->fs.xattr.len); | |
3763 | if (err < 0) { | |
84dfb926 | 3764 | clunk_fid(s, xattr_fidp->fid); |
670185a6 AK |
3765 | goto out; |
3766 | } | |
3767 | } | |
ddca7f86 MK |
3768 | err = pdu_marshal(pdu, offset, "q", size); |
3769 | if (err < 0) { | |
3770 | goto out; | |
3771 | } | |
3772 | err += offset; | |
fa32ef88 AK |
3773 | } else { |
3774 | /* | |
3775 | * specific xattr fid. We check for xattr | |
3776 | * presence also collect the xattr size | |
3777 | */ | |
bccacf6c | 3778 | size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, |
670185a6 AK |
3779 | &name, NULL, 0); |
3780 | if (size < 0) { | |
3781 | err = size; | |
84dfb926 | 3782 | clunk_fid(s, xattr_fidp->fid); |
670185a6 | 3783 | goto out; |
fa32ef88 | 3784 | } |
670185a6 AK |
3785 | /* |
3786 | * Read the xattr value | |
3787 | */ | |
3788 | xattr_fidp->fs.xattr.len = size; | |
3789 | xattr_fidp->fid_type = P9_FID_XATTR; | |
dd28fbbc | 3790 | xattr_fidp->fs.xattr.xattrwalk_fid = true; |
a647502c | 3791 | xattr_fidp->fs.xattr.value = g_malloc0(size); |
670185a6 | 3792 | if (size) { |
bccacf6c | 3793 | err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, |
670185a6 AK |
3794 | &name, xattr_fidp->fs.xattr.value, |
3795 | xattr_fidp->fs.xattr.len); | |
3796 | if (err < 0) { | |
84dfb926 | 3797 | clunk_fid(s, xattr_fidp->fid); |
670185a6 AK |
3798 | goto out; |
3799 | } | |
3800 | } | |
ddca7f86 MK |
3801 | err = pdu_marshal(pdu, offset, "q", size); |
3802 | if (err < 0) { | |
3803 | goto out; | |
3804 | } | |
3805 | err += offset; | |
fa32ef88 | 3806 | } |
7999f7e1 | 3807 | trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); |
fa32ef88 | 3808 | out: |
bccacf6c | 3809 | put_fid(pdu, file_fidp); |
84dfb926 | 3810 | if (xattr_fidp) { |
bccacf6c | 3811 | put_fid(pdu, xattr_fidp); |
84dfb926 AK |
3812 | } |
3813 | out_nofid: | |
dc295f83 | 3814 | pdu_complete(pdu, err); |
670185a6 | 3815 | v9fs_string_free(&name); |
fa32ef88 AK |
3816 | } |
3817 | ||
8440e22e | 3818 | static void coroutine_fn v9fs_xattrcreate(void *opaque) |
10b468bd | 3819 | { |
aca6897f | 3820 | int flags, rflags = 0; |
10b468bd | 3821 | int32_t fid; |
3b79ef2c | 3822 | uint64_t size; |
10b468bd | 3823 | ssize_t err = 0; |
f10ff58d AK |
3824 | V9fsString name; |
3825 | size_t offset = 7; | |
3826 | V9fsFidState *file_fidp; | |
3827 | V9fsFidState *xattr_fidp; | |
3828 | V9fsPDU *pdu = opaque; | |
10b468bd | 3829 | |
ddca7f86 MK |
3830 | v9fs_string_init(&name); |
3831 | err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); | |
3832 | if (err < 0) { | |
3833 | goto out_nofid; | |
3834 | } | |
c572f23a | 3835 | trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); |
10b468bd | 3836 | |
aca6897f KF |
3837 | if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { |
3838 | err = -EINVAL; | |
3839 | goto out_nofid; | |
3840 | } | |
3841 | ||
3842 | if (flags & P9_XATTR_CREATE) { | |
3843 | rflags |= XATTR_CREATE; | |
3844 | } | |
3845 | ||
3846 | if (flags & P9_XATTR_REPLACE) { | |
3847 | rflags |= XATTR_REPLACE; | |
3848 | } | |
3849 | ||
3b79ef2c GK |
3850 | if (size > XATTR_SIZE_MAX) { |
3851 | err = -E2BIG; | |
3852 | goto out_nofid; | |
3853 | } | |
3854 | ||
bccacf6c | 3855 | file_fidp = get_fid(pdu, fid); |
f10ff58d | 3856 | if (file_fidp == NULL) { |
10b468bd | 3857 | err = -EINVAL; |
84dfb926 | 3858 | goto out_nofid; |
10b468bd | 3859 | } |
dd654e03 GK |
3860 | if (file_fidp->fid_type != P9_FID_NONE) { |
3861 | err = -EINVAL; | |
3862 | goto out_put_fid; | |
3863 | } | |
3864 | ||
10b468bd | 3865 | /* Make the file fid point to xattr */ |
f10ff58d AK |
3866 | xattr_fidp = file_fidp; |
3867 | xattr_fidp->fid_type = P9_FID_XATTR; | |
3868 | xattr_fidp->fs.xattr.copied_len = 0; | |
dd28fbbc | 3869 | xattr_fidp->fs.xattr.xattrwalk_fid = false; |
f10ff58d | 3870 | xattr_fidp->fs.xattr.len = size; |
aca6897f | 3871 | xattr_fidp->fs.xattr.flags = rflags; |
f10ff58d AK |
3872 | v9fs_string_init(&xattr_fidp->fs.xattr.name); |
3873 | v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); | |
eb687602 | 3874 | xattr_fidp->fs.xattr.value = g_malloc0(size); |
f10ff58d | 3875 | err = offset; |
dd654e03 | 3876 | out_put_fid: |
bccacf6c | 3877 | put_fid(pdu, file_fidp); |
84dfb926 | 3878 | out_nofid: |
dc295f83 | 3879 | pdu_complete(pdu, err); |
f10ff58d | 3880 | v9fs_string_free(&name); |
10b468bd | 3881 | } |
fa32ef88 | 3882 | |
8440e22e | 3883 | static void coroutine_fn v9fs_readlink(void *opaque) |
df0973a4 | 3884 | { |
ff06030f | 3885 | V9fsPDU *pdu = opaque; |
7a5ca31e VJ |
3886 | size_t offset = 7; |
3887 | V9fsString target; | |
df0973a4 | 3888 | int32_t fid; |
df0973a4 MK |
3889 | int err = 0; |
3890 | V9fsFidState *fidp; | |
3891 | ||
ddca7f86 MK |
3892 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
3893 | if (err < 0) { | |
3894 | goto out_nofid; | |
3895 | } | |
c572f23a | 3896 | trace_v9fs_readlink(pdu->tag, pdu->id, fid); |
bccacf6c | 3897 | fidp = get_fid(pdu, fid); |
df0973a4 MK |
3898 | if (fidp == NULL) { |
3899 | err = -ENOENT; | |
84dfb926 | 3900 | goto out_nofid; |
df0973a4 MK |
3901 | } |
3902 | ||
7a5ca31e | 3903 | v9fs_string_init(&target); |
bccacf6c | 3904 | err = v9fs_co_readlink(pdu, &fidp->path, &target); |
7a5ca31e VJ |
3905 | if (err < 0) { |
3906 | goto out; | |
3907 | } | |
ddca7f86 MK |
3908 | err = pdu_marshal(pdu, offset, "s", &target); |
3909 | if (err < 0) { | |
3910 | v9fs_string_free(&target); | |
3911 | goto out; | |
3912 | } | |
3913 | err += offset; | |
7999f7e1 | 3914 | trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); |
7a5ca31e | 3915 | v9fs_string_free(&target); |
df0973a4 | 3916 | out: |
bccacf6c | 3917 | put_fid(pdu, fidp); |
84dfb926 | 3918 | out_nofid: |
dc295f83 | 3919 | pdu_complete(pdu, err); |
df0973a4 MK |
3920 | } |
3921 | ||
ff06030f | 3922 | static CoroutineEntry *pdu_co_handlers[] = { |
c18e2f94 | 3923 | [P9_TREADDIR] = v9fs_readdir, |
be940c87 | 3924 | [P9_TSTATFS] = v9fs_statfs, |
00ede4c2 | 3925 | [P9_TGETATTR] = v9fs_getattr, |
c79ce737 | 3926 | [P9_TSETATTR] = v9fs_setattr, |
fa32ef88 | 3927 | [P9_TXATTRWALK] = v9fs_xattrwalk, |
10b468bd | 3928 | [P9_TXATTRCREATE] = v9fs_xattrcreate, |
5268cecc | 3929 | [P9_TMKNOD] = v9fs_mknod, |
c7b4b0b3 | 3930 | [P9_TRENAME] = v9fs_rename, |
82cc3ee8 | 3931 | [P9_TLOCK] = v9fs_lock, |
8f354003 | 3932 | [P9_TGETLOCK] = v9fs_getlock, |
89bf6593 | 3933 | [P9_TRENAMEAT] = v9fs_renameat, |
df0973a4 | 3934 | [P9_TREADLINK] = v9fs_readlink, |
7834cf77 | 3935 | [P9_TUNLINKAT] = v9fs_unlinkat, |
b67592ea | 3936 | [P9_TMKDIR] = v9fs_mkdir, |
9f107513 | 3937 | [P9_TVERSION] = v9fs_version, |
771e9d4c | 3938 | [P9_TLOPEN] = v9fs_open, |
9f107513 AL |
3939 | [P9_TATTACH] = v9fs_attach, |
3940 | [P9_TSTAT] = v9fs_stat, | |
3941 | [P9_TWALK] = v9fs_walk, | |
3942 | [P9_TCLUNK] = v9fs_clunk, | |
b41e95d3 | 3943 | [P9_TFSYNC] = v9fs_fsync, |
9f107513 AL |
3944 | [P9_TOPEN] = v9fs_open, |
3945 | [P9_TREAD] = v9fs_read, | |
3946 | #if 0 | |
3947 | [P9_TAUTH] = v9fs_auth, | |
3948 | #endif | |
3949 | [P9_TFLUSH] = v9fs_flush, | |
b2c224be | 3950 | [P9_TLINK] = v9fs_link, |
08c60fc9 | 3951 | [P9_TSYMLINK] = v9fs_symlink, |
9f107513 | 3952 | [P9_TCREATE] = v9fs_create, |
c1568af5 | 3953 | [P9_TLCREATE] = v9fs_lcreate, |
9f107513 AL |
3954 | [P9_TWRITE] = v9fs_write, |
3955 | [P9_TWSTAT] = v9fs_wstat, | |
3956 | [P9_TREMOVE] = v9fs_remove, | |
3957 | }; | |
3958 | ||
8440e22e | 3959 | static void coroutine_fn v9fs_op_not_supp(void *opaque) |
5c3234c6 | 3960 | { |
ff06030f | 3961 | V9fsPDU *pdu = opaque; |
dc295f83 | 3962 | pdu_complete(pdu, -EOPNOTSUPP); |
5c3234c6 AK |
3963 | } |
3964 | ||
8440e22e | 3965 | static void coroutine_fn v9fs_fs_ro(void *opaque) |
2c74c2cb MK |
3966 | { |
3967 | V9fsPDU *pdu = opaque; | |
dc295f83 | 3968 | pdu_complete(pdu, -EROFS); |
2c74c2cb MK |
3969 | } |
3970 | ||
3971 | static inline bool is_read_only_op(V9fsPDU *pdu) | |
3972 | { | |
3973 | switch (pdu->id) { | |
3974 | case P9_TREADDIR: | |
3975 | case P9_TSTATFS: | |
3976 | case P9_TGETATTR: | |
3977 | case P9_TXATTRWALK: | |
3978 | case P9_TLOCK: | |
3979 | case P9_TGETLOCK: | |
3980 | case P9_TREADLINK: | |
3981 | case P9_TVERSION: | |
3982 | case P9_TLOPEN: | |
3983 | case P9_TATTACH: | |
3984 | case P9_TSTAT: | |
3985 | case P9_TWALK: | |
3986 | case P9_TCLUNK: | |
3987 | case P9_TFSYNC: | |
3988 | case P9_TOPEN: | |
3989 | case P9_TREAD: | |
3990 | case P9_TAUTH: | |
3991 | case P9_TFLUSH: | |
3992 | return 1; | |
3993 | default: | |
3994 | return 0; | |
3995 | } | |
3996 | } | |
3997 | ||
506f3275 | 3998 | void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) |
9f107513 | 3999 | { |
ff06030f VJ |
4000 | Coroutine *co; |
4001 | CoroutineEntry *handler; | |
ad38ce9e | 4002 | V9fsState *s = pdu->s; |
9f107513 | 4003 | |
506f3275 GK |
4004 | pdu->size = le32_to_cpu(hdr->size_le); |
4005 | pdu->id = hdr->id; | |
4006 | pdu->tag = le16_to_cpu(hdr->tag_le); | |
4007 | ||
ff06030f VJ |
4008 | if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || |
4009 | (pdu_co_handlers[pdu->id] == NULL)) { | |
5c3234c6 | 4010 | handler = v9fs_op_not_supp; |
d1471233 GK |
4011 | } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { |
4012 | handler = v9fs_fs_ro; | |
5c3234c6 | 4013 | } else { |
ff06030f | 4014 | handler = pdu_co_handlers[pdu->id]; |
5c3234c6 | 4015 | } |
2c74c2cb | 4016 | |
506f3275 | 4017 | qemu_co_queue_init(&pdu->complete); |
0b8b8753 PB |
4018 | co = qemu_coroutine_create(handler, pdu); |
4019 | qemu_coroutine_enter(co); | |
9f107513 AL |
4020 | } |
4021 | ||
2a0c56aa | 4022 | /* Returns 0 on success, 1 on failure. */ |
066eb006 GK |
4023 | int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, |
4024 | Error **errp) | |
2a0c56aa WL |
4025 | { |
4026 | int i, len; | |
4027 | struct stat stat; | |
4028 | FsDriverEntry *fse; | |
4029 | V9fsPath path; | |
4030 | int rc = 1; | |
4031 | ||
066eb006 GK |
4032 | assert(!s->transport); |
4033 | s->transport = t; | |
4034 | ||
2a0c56aa WL |
4035 | /* initialize pdu allocator */ |
4036 | QLIST_INIT(&s->free_list); | |
4037 | QLIST_INIT(&s->active_list); | |
0d78289c | 4038 | for (i = 0; i < MAX_REQ; i++) { |
583f21f8 SS |
4039 | QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
4040 | s->pdus[i].s = s; | |
4041 | s->pdus[i].idx = i; | |
2a0c56aa WL |
4042 | } |
4043 | ||
4044 | v9fs_path_init(&path); | |
4045 | ||
4046 | fse = get_fsdev_fsentry(s->fsconf.fsdev_id); | |
4047 | ||
4048 | if (!fse) { | |
4049 | /* We don't have a fsdev identified by fsdev_id */ | |
4050 | error_setg(errp, "9pfs device couldn't find fsdev with the " | |
4051 | "id = %s", | |
4052 | s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); | |
4053 | goto out; | |
4054 | } | |
4055 | ||
4056 | if (!s->fsconf.tag) { | |
4057 | /* we haven't specified a mount_tag */ | |
4058 | error_setg(errp, "fsdev with id %s needs mount_tag arguments", | |
4059 | s->fsconf.fsdev_id); | |
4060 | goto out; | |
4061 | } | |
4062 | ||
4063 | s->ctx.export_flags = fse->export_flags; | |
4064 | s->ctx.fs_root = g_strdup(fse->path); | |
4065 | s->ctx.exops.get_st_gen = NULL; | |
4066 | len = strlen(s->fsconf.tag); | |
4067 | if (len > MAX_TAG_LEN - 1) { | |
4068 | error_setg(errp, "mount tag '%s' (%d bytes) is longer than " | |
4069 | "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); | |
4070 | goto out; | |
4071 | } | |
4072 | ||
4073 | s->tag = g_strdup(s->fsconf.tag); | |
4074 | s->ctx.uid = -1; | |
4075 | ||
4076 | s->ops = fse->ops; | |
4077 | ||
b96feb2c TS |
4078 | s->ctx.fmode = fse->fmode; |
4079 | s->ctx.dmode = fse->dmode; | |
4080 | ||
2a0c56aa WL |
4081 | s->fid_list = NULL; |
4082 | qemu_co_rwlock_init(&s->rename_lock); | |
4083 | ||
65603a80 GK |
4084 | if (s->ops->init(&s->ctx, errp) < 0) { |
4085 | error_prepend(errp, "cannot initialize fsdev '%s': ", | |
4086 | s->fsconf.fsdev_id); | |
2a0c56aa WL |
4087 | goto out; |
4088 | } | |
4089 | ||
4090 | /* | |
4091 | * Check details of export path, We need to use fs driver | |
4092 | * call back to do that. Since we are in the init path, we don't | |
4093 | * use co-routines here. | |
4094 | */ | |
4095 | if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { | |
4096 | error_setg(errp, | |
4097 | "error in converting name to path %s", strerror(errno)); | |
4098 | goto out; | |
4099 | } | |
4100 | if (s->ops->lstat(&s->ctx, &path, &stat)) { | |
4101 | error_setg(errp, "share path %s does not exist", fse->path); | |
4102 | goto out; | |
4103 | } else if (!S_ISDIR(stat.st_mode)) { | |
4104 | error_setg(errp, "share path %s is not a directory", fse->path); | |
4105 | goto out; | |
4106 | } | |
b8bbdb88 | 4107 | |
3b5ee9e8 AM |
4108 | s->dev_id = stat.st_dev; |
4109 | ||
6b6aa828 CS |
4110 | /* init inode remapping : */ |
4111 | /* hash table for variable length inode suffixes */ | |
4112 | qpd_table_init(&s->qpd_table); | |
4113 | /* hash table for slow/full inode remapping (most users won't need it) */ | |
4114 | qpf_table_init(&s->qpf_table); | |
4115 | /* hash table for quick inode remapping */ | |
1a6ed33c | 4116 | qpp_table_init(&s->qpp_table); |
6b6aa828 CS |
4117 | s->qp_ndevices = 0; |
4118 | s->qp_affix_next = 1; /* reserve 0 to detect overflow */ | |
f3fe4a2d | 4119 | s->qp_fullpath_next = 1; |
1a6ed33c | 4120 | |
b8bbdb88 PJ |
4121 | s->ctx.fst = &fse->fst; |
4122 | fsdev_throttle_init(s->ctx.fst); | |
4123 | ||
2a0c56aa WL |
4124 | rc = 0; |
4125 | out: | |
4126 | if (rc) { | |
b69c3c21 | 4127 | v9fs_device_unrealize_common(s); |
2a0c56aa | 4128 | } |
c0da0cb7 | 4129 | v9fs_path_free(&path); |
2a0c56aa WL |
4130 | return rc; |
4131 | } | |
4132 | ||
b69c3c21 | 4133 | void v9fs_device_unrealize_common(V9fsState *s) |
2a0c56aa | 4134 | { |
c0da0cb7 | 4135 | if (s->ops && s->ops->cleanup) { |
702dbcc2 LQ |
4136 | s->ops->cleanup(&s->ctx); |
4137 | } | |
c0da0cb7 GK |
4138 | if (s->ctx.fst) { |
4139 | fsdev_throttle_cleanup(s->ctx.fst); | |
4140 | } | |
2a0c56aa | 4141 | g_free(s->tag); |
6b6aa828 | 4142 | qp_table_destroy(&s->qpd_table); |
f3fe4a2d AM |
4143 | qp_table_destroy(&s->qpp_table); |
4144 | qp_table_destroy(&s->qpf_table); | |
4774718e | 4145 | g_free(s->ctx.fs_root); |
2a0c56aa WL |
4146 | } |
4147 | ||
0e44a0fd GK |
4148 | typedef struct VirtfsCoResetData { |
4149 | V9fsPDU pdu; | |
4150 | bool done; | |
4151 | } VirtfsCoResetData; | |
4152 | ||
4153 | static void coroutine_fn virtfs_co_reset(void *opaque) | |
4154 | { | |
4155 | VirtfsCoResetData *data = opaque; | |
4156 | ||
4157 | virtfs_reset(&data->pdu); | |
4158 | data->done = true; | |
4159 | } | |
4160 | ||
4161 | void v9fs_reset(V9fsState *s) | |
4162 | { | |
4163 | VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; | |
4164 | Coroutine *co; | |
4165 | ||
4166 | while (!QLIST_EMPTY(&s->active_list)) { | |
4167 | aio_poll(qemu_get_aio_context(), true); | |
4168 | } | |
4169 | ||
4170 | co = qemu_coroutine_create(virtfs_co_reset, &data); | |
4171 | qemu_coroutine_enter(co); | |
4172 | ||
4173 | while (!data.done) { | |
4174 | aio_poll(qemu_get_aio_context(), true); | |
4175 | } | |
4176 | } | |
4177 | ||
72a18977 | 4178 | static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) |
7a462745 AK |
4179 | { |
4180 | struct rlimit rlim; | |
4181 | if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { | |
63325b18 | 4182 | error_report("Failed to get the resource limit"); |
7a462745 AK |
4183 | exit(1); |
4184 | } | |
4185 | open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3); | |
4186 | open_fd_rc = rlim.rlim_cur/2; | |
4187 | } |