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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> |
03556ea9 | 31 | #include <linux/limits.h> |
9f107513 | 32 | |
7a462745 AK |
33 | int open_fd_hw; |
34 | int total_open_fd; | |
35 | static int open_fd_rc; | |
9f107513 | 36 | |
fac4f111 VJ |
37 | enum { |
38 | Oread = 0x00, | |
39 | Owrite = 0x01, | |
40 | Ordwr = 0x02, | |
41 | Oexec = 0x03, | |
42 | Oexcl = 0x04, | |
43 | Otrunc = 0x10, | |
44 | Orexec = 0x20, | |
45 | Orclose = 0x40, | |
46 | Oappend = 0x80, | |
47 | }; | |
48 | ||
75673590 | 49 | static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
0e2082d9 WL |
50 | { |
51 | ssize_t ret; | |
52 | va_list ap; | |
53 | ||
54 | va_start(ap, fmt); | |
ea83441c | 55 | ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); |
0e2082d9 WL |
56 | va_end(ap); |
57 | ||
58 | return ret; | |
59 | } | |
60 | ||
75673590 | 61 | static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
0e2082d9 WL |
62 | { |
63 | ssize_t ret; | |
64 | va_list ap; | |
65 | ||
66 | va_start(ap, fmt); | |
ea83441c | 67 | ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); |
0e2082d9 WL |
68 | va_end(ap); |
69 | ||
70 | return ret; | |
71 | } | |
72 | ||
fac4f111 VJ |
73 | static int omode_to_uflags(int8_t mode) |
74 | { | |
75 | int ret = 0; | |
76 | ||
77 | switch (mode & 3) { | |
78 | case Oread: | |
79 | ret = O_RDONLY; | |
80 | break; | |
81 | case Ordwr: | |
82 | ret = O_RDWR; | |
83 | break; | |
84 | case Owrite: | |
85 | ret = O_WRONLY; | |
86 | break; | |
87 | case Oexec: | |
88 | ret = O_RDONLY; | |
89 | break; | |
90 | } | |
91 | ||
92 | if (mode & Otrunc) { | |
93 | ret |= O_TRUNC; | |
94 | } | |
95 | ||
96 | if (mode & Oappend) { | |
97 | ret |= O_APPEND; | |
98 | } | |
99 | ||
100 | if (mode & Oexcl) { | |
101 | ret |= O_EXCL; | |
102 | } | |
103 | ||
104 | return ret; | |
105 | } | |
106 | ||
8e71b96c | 107 | typedef struct DotlOpenflagMap { |
9844081b MK |
108 | int dotl_flag; |
109 | int open_flag; | |
8e71b96c | 110 | } DotlOpenflagMap; |
9844081b MK |
111 | |
112 | static int dotl_to_open_flags(int flags) | |
113 | { | |
114 | int i; | |
115 | /* | |
116 | * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY | |
117 | * and P9_DOTL_NOACCESS | |
118 | */ | |
119 | int oflags = flags & O_ACCMODE; | |
120 | ||
8e71b96c | 121 | DotlOpenflagMap dotl_oflag_map[] = { |
9844081b MK |
122 | { P9_DOTL_CREATE, O_CREAT }, |
123 | { P9_DOTL_EXCL, O_EXCL }, | |
124 | { P9_DOTL_NOCTTY , O_NOCTTY }, | |
125 | { P9_DOTL_TRUNC, O_TRUNC }, | |
126 | { P9_DOTL_APPEND, O_APPEND }, | |
127 | { P9_DOTL_NONBLOCK, O_NONBLOCK } , | |
128 | { P9_DOTL_DSYNC, O_DSYNC }, | |
129 | { P9_DOTL_FASYNC, FASYNC }, | |
130 | { P9_DOTL_DIRECT, O_DIRECT }, | |
131 | { P9_DOTL_LARGEFILE, O_LARGEFILE }, | |
132 | { P9_DOTL_DIRECTORY, O_DIRECTORY }, | |
133 | { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, | |
134 | { P9_DOTL_NOATIME, O_NOATIME }, | |
135 | { P9_DOTL_SYNC, O_SYNC }, | |
136 | }; | |
137 | ||
138 | for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { | |
139 | if (flags & dotl_oflag_map[i].dotl_flag) { | |
140 | oflags |= dotl_oflag_map[i].open_flag; | |
141 | } | |
142 | } | |
143 | ||
144 | return oflags; | |
145 | } | |
146 | ||
758e8e38 | 147 | void cred_init(FsCred *credp) |
131dcb25 | 148 | { |
758e8e38 VJ |
149 | credp->fc_uid = -1; |
150 | credp->fc_gid = -1; | |
151 | credp->fc_mode = -1; | |
152 | credp->fc_rdev = -1; | |
131dcb25 AL |
153 | } |
154 | ||
d3ab98e6 AK |
155 | static int get_dotl_openflags(V9fsState *s, int oflags) |
156 | { | |
157 | int flags; | |
158 | /* | |
159 | * Filter the client open flags | |
160 | */ | |
9844081b MK |
161 | flags = dotl_to_open_flags(oflags); |
162 | flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); | |
d3ab98e6 AK |
163 | /* |
164 | * Ignore direct disk access hint until the server supports it. | |
165 | */ | |
166 | flags &= ~O_DIRECT; | |
167 | return flags; | |
168 | } | |
169 | ||
2289be19 AK |
170 | void v9fs_path_init(V9fsPath *path) |
171 | { | |
172 | path->data = NULL; | |
173 | path->size = 0; | |
174 | } | |
175 | ||
176 | void v9fs_path_free(V9fsPath *path) | |
177 | { | |
178 | g_free(path->data); | |
179 | path->data = NULL; | |
180 | path->size = 0; | |
181 | } | |
182 | ||
e3e83f2e GK |
183 | |
184 | void GCC_FMT_ATTR(2, 3) | |
185 | v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) | |
186 | { | |
187 | va_list ap; | |
188 | ||
189 | v9fs_path_free(path); | |
190 | ||
191 | va_start(ap, fmt); | |
192 | /* Bump the size for including terminating NULL */ | |
193 | path->size = g_vasprintf(&path->data, fmt, ap) + 1; | |
194 | va_end(ap); | |
195 | } | |
196 | ||
e446a1eb | 197 | void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) |
2289be19 | 198 | { |
e446a1eb MAL |
199 | v9fs_path_free(dst); |
200 | dst->size = src->size; | |
201 | dst->data = g_memdup(src->data, src->size); | |
2289be19 AK |
202 | } |
203 | ||
204 | int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, | |
205 | const char *name, V9fsPath *path) | |
206 | { | |
207 | int err; | |
208 | err = s->ops->name_to_path(&s->ctx, dirpath, name, path); | |
209 | if (err < 0) { | |
210 | err = -errno; | |
211 | } | |
212 | return err; | |
213 | } | |
214 | ||
936532a4 MN |
215 | /* |
216 | * Return TRUE if s1 is an ancestor of s2. | |
217 | * | |
218 | * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". | |
219 | * As a special case, We treat s1 as ancestor of s2 if they are same! | |
220 | */ | |
2289be19 | 221 | static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) |
936532a4 | 222 | { |
2289be19 AK |
223 | if (!strncmp(s1->data, s2->data, s1->size - 1)) { |
224 | if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { | |
936532a4 MN |
225 | return 1; |
226 | } | |
227 | } | |
228 | return 0; | |
229 | } | |
230 | ||
a03f7874 AL |
231 | static size_t v9fs_string_size(V9fsString *str) |
232 | { | |
233 | return str->size; | |
234 | } | |
235 | ||
b9cb88b0 AK |
236 | /* |
237 | * returns 0 if fid got re-opened, 1 if not, < 0 on error */ | |
8440e22e | 238 | static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) |
b9cb88b0 AK |
239 | { |
240 | int err = 1; | |
241 | if (f->fid_type == P9_FID_FILE) { | |
242 | if (f->fs.fd == -1) { | |
243 | do { | |
bccacf6c AK |
244 | err = v9fs_co_open(pdu, f, f->open_flags); |
245 | } while (err == -EINTR && !pdu->cancelled); | |
b9cb88b0 AK |
246 | } |
247 | } else if (f->fid_type == P9_FID_DIR) { | |
f314ea4e | 248 | if (f->fs.dir.stream == NULL) { |
b9cb88b0 | 249 | do { |
bccacf6c AK |
250 | err = v9fs_co_opendir(pdu, f); |
251 | } while (err == -EINTR && !pdu->cancelled); | |
b9cb88b0 AK |
252 | } |
253 | } | |
254 | return err; | |
255 | } | |
256 | ||
8440e22e | 257 | static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) |
286d5652 | 258 | { |
7a462745 | 259 | int err; |
286d5652 | 260 | V9fsFidState *f; |
bccacf6c | 261 | V9fsState *s = pdu->s; |
286d5652 | 262 | |
feabd6cf | 263 | QSIMPLEQ_FOREACH(f, &s->fid_list, next) { |
84dfb926 | 264 | BUG_ON(f->clunked); |
286d5652 | 265 | if (f->fid == fid) { |
7a462745 AK |
266 | /* |
267 | * Update the fid ref upfront so that | |
268 | * we don't get reclaimed when we yield | |
269 | * in open later. | |
270 | */ | |
84dfb926 | 271 | f->ref++; |
7a462745 AK |
272 | /* |
273 | * check whether we need to reopen the | |
274 | * file. We might have closed the fd | |
275 | * while trying to free up some file | |
276 | * descriptors. | |
277 | */ | |
bccacf6c | 278 | err = v9fs_reopen_fid(pdu, f); |
b9cb88b0 AK |
279 | if (err < 0) { |
280 | f->ref--; | |
281 | return NULL; | |
282 | } | |
7a462745 AK |
283 | /* |
284 | * Mark the fid as referenced so that the LRU | |
285 | * reclaim won't close the file descriptor | |
286 | */ | |
287 | f->flags |= FID_REFERENCED; | |
286d5652 AL |
288 | return f; |
289 | } | |
290 | } | |
286d5652 AL |
291 | return NULL; |
292 | } | |
293 | ||
294 | static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) | |
295 | { | |
296 | V9fsFidState *f; | |
297 | ||
feabd6cf | 298 | QSIMPLEQ_FOREACH(f, &s->fid_list, next) { |
84dfb926 AK |
299 | /* If fid is already there return NULL */ |
300 | BUG_ON(f->clunked); | |
301 | if (f->fid == fid) { | |
302 | return NULL; | |
303 | } | |
286d5652 | 304 | } |
7267c094 | 305 | f = g_malloc0(sizeof(V9fsFidState)); |
286d5652 | 306 | f->fid = fid; |
d62dbb51 | 307 | f->fid_type = P9_FID_NONE; |
84dfb926 | 308 | f->ref = 1; |
7a462745 AK |
309 | /* |
310 | * Mark the fid as referenced so that the LRU | |
311 | * reclaim won't close the file descriptor | |
312 | */ | |
313 | f->flags |= FID_REFERENCED; | |
20b7f45b | 314 | QSIMPLEQ_INSERT_TAIL(&s->fid_list, f, next); |
286d5652 | 315 | |
d2c5cf7c CS |
316 | v9fs_readdir_init(s->proto_version, &f->fs.dir); |
317 | v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); | |
7cde47d4 | 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 | { |
feabd6cf | 403 | V9fsFidState *fidp; |
286d5652 | 404 | |
feabd6cf GK |
405 | QSIMPLEQ_FOREACH(fidp, &s->fid_list, next) { |
406 | if (fidp->fid == fid) { | |
407 | QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); | |
408 | fidp->clunked = true; | |
409 | return fidp; | |
286d5652 AL |
410 | } |
411 | } | |
feabd6cf | 412 | return NULL; |
286d5652 AL |
413 | } |
414 | ||
8440e22e | 415 | void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) |
7a462745 AK |
416 | { |
417 | int reclaim_count = 0; | |
bccacf6c | 418 | V9fsState *s = pdu->s; |
7a462745 AK |
419 | V9fsFidState *f, *reclaim_list = NULL; |
420 | ||
feabd6cf | 421 | QSIMPLEQ_FOREACH(f, &s->fid_list, next) { |
7a462745 AK |
422 | /* |
423 | * Unlink fids cannot be reclaimed. Check | |
424 | * for them and skip them. Also skip fids | |
425 | * currently being operated on. | |
426 | */ | |
427 | if (f->ref || f->flags & FID_NON_RECLAIMABLE) { | |
428 | continue; | |
429 | } | |
430 | /* | |
431 | * if it is a recently referenced fid | |
432 | * we leave the fid untouched and clear the | |
433 | * reference bit. We come back to it later | |
434 | * in the next iteration. (a simple LRU without | |
435 | * moving list elements around) | |
436 | */ | |
437 | if (f->flags & FID_REFERENCED) { | |
438 | f->flags &= ~FID_REFERENCED; | |
439 | continue; | |
440 | } | |
441 | /* | |
442 | * Add fids to reclaim list. | |
443 | */ | |
444 | if (f->fid_type == P9_FID_FILE) { | |
445 | if (f->fs.fd != -1) { | |
446 | /* | |
447 | * Up the reference count so that | |
448 | * a clunk request won't free this fid | |
449 | */ | |
450 | f->ref++; | |
451 | f->rclm_lst = reclaim_list; | |
452 | reclaim_list = f; | |
453 | f->fs_reclaim.fd = f->fs.fd; | |
454 | f->fs.fd = -1; | |
455 | reclaim_count++; | |
456 | } | |
95f65511 | 457 | } else if (f->fid_type == P9_FID_DIR) { |
f314ea4e | 458 | if (f->fs.dir.stream != NULL) { |
95f65511 AK |
459 | /* |
460 | * Up the reference count so that | |
461 | * a clunk request won't free this fid | |
462 | */ | |
463 | f->ref++; | |
464 | f->rclm_lst = reclaim_list; | |
465 | reclaim_list = f; | |
f314ea4e GK |
466 | f->fs_reclaim.dir.stream = f->fs.dir.stream; |
467 | f->fs.dir.stream = NULL; | |
95f65511 AK |
468 | reclaim_count++; |
469 | } | |
7a462745 AK |
470 | } |
471 | if (reclaim_count >= open_fd_rc) { | |
472 | break; | |
473 | } | |
474 | } | |
475 | /* | |
476 | * Now close the fid in reclaim list. Free them if they | |
477 | * are already clunked. | |
478 | */ | |
479 | while (reclaim_list) { | |
480 | f = reclaim_list; | |
481 | reclaim_list = f->rclm_lst; | |
482 | if (f->fid_type == P9_FID_FILE) { | |
cc720ddb | 483 | v9fs_co_close(pdu, &f->fs_reclaim); |
95f65511 | 484 | } else if (f->fid_type == P9_FID_DIR) { |
cc720ddb | 485 | v9fs_co_closedir(pdu, &f->fs_reclaim); |
7a462745 AK |
486 | } |
487 | f->rclm_lst = NULL; | |
488 | /* | |
489 | * Now drop the fid reference, free it | |
490 | * if clunked. | |
491 | */ | |
bccacf6c | 492 | put_fid(pdu, f); |
7a462745 AK |
493 | } |
494 | } | |
495 | ||
8440e22e | 496 | static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) |
7a462745 AK |
497 | { |
498 | int err; | |
bccacf6c | 499 | V9fsState *s = pdu->s; |
20b7f45b | 500 | V9fsFidState *fidp, *fidp_next; |
7a462745 | 501 | |
20b7f45b GK |
502 | fidp = QSIMPLEQ_FIRST(&s->fid_list); |
503 | if (!fidp) { | |
504 | return 0; | |
505 | } | |
506 | ||
507 | /* | |
508 | * v9fs_reopen_fid() can yield : a reference on the fid must be held | |
509 | * to ensure its pointer remains valid and we can safely pass it to | |
510 | * QSIMPLEQ_NEXT(). The corresponding put_fid() can also yield so | |
511 | * we must keep a reference on the next fid as well. So the logic here | |
512 | * is to get a reference on a fid and only put it back during the next | |
513 | * iteration after we could get a reference on the next fid. Start with | |
514 | * the first one. | |
515 | */ | |
516 | for (fidp->ref++; fidp; fidp = fidp_next) { | |
517 | if (fidp->path.size == path->size && | |
518 | !memcmp(fidp->path.data, path->data, path->size)) { | |
7a462745 AK |
519 | /* Mark the fid non reclaimable. */ |
520 | fidp->flags |= FID_NON_RECLAIMABLE; | |
b9cb88b0 AK |
521 | |
522 | /* reopen the file/dir if already closed */ | |
bccacf6c | 523 | err = v9fs_reopen_fid(pdu, fidp); |
b9cb88b0 | 524 | if (err < 0) { |
20b7f45b | 525 | put_fid(pdu, fidp); |
267fcadf | 526 | return err; |
b9cb88b0 | 527 | } |
20b7f45b GK |
528 | } |
529 | ||
530 | fidp_next = QSIMPLEQ_NEXT(fidp, next); | |
531 | ||
532 | if (fidp_next) { | |
b9cb88b0 | 533 | /* |
20b7f45b GK |
534 | * Ensure the next fid survives a potential clunk request during |
535 | * put_fid() below and v9fs_reopen_fid() in the next iteration. | |
b9cb88b0 | 536 | */ |
20b7f45b | 537 | fidp_next->ref++; |
7a462745 | 538 | } |
20b7f45b GK |
539 | |
540 | /* We're done with this fid */ | |
541 | put_fid(pdu, fidp); | |
7a462745 | 542 | } |
20b7f45b | 543 | |
7a462745 AK |
544 | return 0; |
545 | } | |
546 | ||
8440e22e | 547 | static void coroutine_fn virtfs_reset(V9fsPDU *pdu) |
b41e2992 DS |
548 | { |
549 | V9fsState *s = pdu->s; | |
79decce3 | 550 | V9fsFidState *fidp; |
b41e2992 DS |
551 | |
552 | /* Free all fids */ | |
feabd6cf | 553 | while (!QSIMPLEQ_EMPTY(&s->fid_list)) { |
6d54af0e | 554 | /* Get fid */ |
feabd6cf | 555 | fidp = QSIMPLEQ_FIRST(&s->fid_list); |
6d54af0e GK |
556 | fidp->ref++; |
557 | ||
558 | /* Clunk fid */ | |
feabd6cf | 559 | QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); |
2e53160f | 560 | fidp->clunked = true; |
b41e2992 | 561 | |
6d54af0e | 562 | put_fid(pdu, fidp); |
b41e2992 | 563 | } |
b41e2992 DS |
564 | } |
565 | ||
286d5652 AL |
566 | #define P9_QID_TYPE_DIR 0x80 |
567 | #define P9_QID_TYPE_SYMLINK 0x02 | |
568 | ||
569 | #define P9_STAT_MODE_DIR 0x80000000 | |
570 | #define P9_STAT_MODE_APPEND 0x40000000 | |
571 | #define P9_STAT_MODE_EXCL 0x20000000 | |
572 | #define P9_STAT_MODE_MOUNT 0x10000000 | |
573 | #define P9_STAT_MODE_AUTH 0x08000000 | |
574 | #define P9_STAT_MODE_TMP 0x04000000 | |
575 | #define P9_STAT_MODE_SYMLINK 0x02000000 | |
576 | #define P9_STAT_MODE_LINK 0x01000000 | |
577 | #define P9_STAT_MODE_DEVICE 0x00800000 | |
578 | #define P9_STAT_MODE_NAMED_PIPE 0x00200000 | |
579 | #define P9_STAT_MODE_SOCKET 0x00100000 | |
580 | #define P9_STAT_MODE_SETUID 0x00080000 | |
581 | #define P9_STAT_MODE_SETGID 0x00040000 | |
582 | #define P9_STAT_MODE_SETVTX 0x00010000 | |
583 | ||
584 | #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ | |
585 | P9_STAT_MODE_SYMLINK | \ | |
586 | P9_STAT_MODE_LINK | \ | |
587 | P9_STAT_MODE_DEVICE | \ | |
588 | P9_STAT_MODE_NAMED_PIPE | \ | |
589 | P9_STAT_MODE_SOCKET) | |
590 | ||
6b6aa828 CS |
591 | /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ |
592 | static inline uint8_t mirror8bit(uint8_t byte) | |
593 | { | |
594 | return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; | |
595 | } | |
596 | ||
597 | /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ | |
598 | static inline uint64_t mirror64bit(uint64_t value) | |
599 | { | |
600 | return ((uint64_t)mirror8bit(value & 0xff) << 56) | | |
601 | ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | | |
602 | ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | | |
603 | ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | | |
604 | ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | | |
605 | ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | | |
606 | ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | | |
607 | ((uint64_t)mirror8bit((value >> 56) & 0xff)); | |
608 | } | |
609 | ||
610 | /** | |
611 | * @brief Parameter k for the Exponential Golomb algorihm to be used. | |
612 | * | |
613 | * The smaller this value, the smaller the minimum bit count for the Exp. | |
614 | * Golomb generated affixes will be (at lowest index) however for the | |
615 | * price of having higher maximum bit count of generated affixes (at highest | |
616 | * index). Likewise increasing this parameter yields in smaller maximum bit | |
617 | * count for the price of having higher minimum bit count. | |
618 | * | |
619 | * In practice that means: a good value for k depends on the expected amount | |
620 | * of devices to be exposed by one export. For a small amount of devices k | |
621 | * should be small, for a large amount of devices k might be increased | |
622 | * instead. The default of k=0 should be fine for most users though. | |
623 | * | |
624 | * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of | |
625 | * k should not change as long as guest is still running! Because that would | |
626 | * cause completely different inode numbers to be generated on guest. | |
627 | */ | |
628 | #define EXP_GOLOMB_K 0 | |
629 | ||
630 | /** | |
631 | * @brief Exponential Golomb algorithm for arbitrary k (including k=0). | |
632 | * | |
633 | * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) | |
634 | * with growing length and with the mathematical property of being | |
635 | * "prefix-free". The latter means the generated prefixes can be prepended | |
636 | * in front of arbitrary numbers and the resulting concatenated numbers are | |
637 | * guaranteed to be always unique. | |
638 | * | |
639 | * This is a minor adjustment to the original Exp. Golomb algorithm in the | |
640 | * sense that lowest allowed index (@param n) starts with 1, not with zero. | |
641 | * | |
642 | * @param n - natural number (or index) of the prefix to be generated | |
643 | * (1, 2, 3, ...) | |
644 | * @param k - parameter k of Exp. Golomb algorithm to be used | |
645 | * (see comment on EXP_GOLOMB_K macro for details about k) | |
646 | */ | |
647 | static VariLenAffix expGolombEncode(uint64_t n, int k) | |
648 | { | |
649 | const uint64_t value = n + (1 << k) - 1; | |
650 | const int bits = (int) log2(value) + 1; | |
651 | return (VariLenAffix) { | |
652 | .type = AffixType_Prefix, | |
653 | .value = value, | |
654 | .bits = bits + MAX((bits - 1 - k), 0) | |
655 | }; | |
656 | } | |
657 | ||
658 | /** | |
659 | * @brief Converts a suffix into a prefix, or a prefix into a suffix. | |
660 | * | |
661 | * Simply mirror all bits of the affix value, for the purpose to preserve | |
662 | * respectively the mathematical "prefix-free" or "suffix-free" property | |
663 | * after the conversion. | |
664 | * | |
665 | * If a passed prefix is suitable to create unique numbers, then the | |
666 | * returned suffix is suitable to create unique numbers as well (and vice | |
667 | * versa). | |
668 | */ | |
669 | static VariLenAffix invertAffix(const VariLenAffix *affix) | |
670 | { | |
671 | return (VariLenAffix) { | |
672 | .type = | |
673 | (affix->type == AffixType_Suffix) ? | |
674 | AffixType_Prefix : AffixType_Suffix, | |
675 | .value = | |
676 | mirror64bit(affix->value) >> | |
677 | ((sizeof(affix->value) * 8) - affix->bits), | |
678 | .bits = affix->bits | |
679 | }; | |
680 | } | |
681 | ||
682 | /** | |
683 | * @brief Generates suffix numbers with "suffix-free" property. | |
684 | * | |
685 | * This is just a wrapper function on top of the Exp. Golomb algorithm. | |
686 | * | |
687 | * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, | |
688 | * this function converts the Exp. Golomb prefixes into appropriate suffixes | |
689 | * which are still suitable for generating unique numbers. | |
690 | * | |
691 | * @param n - natural number (or index) of the suffix to be generated | |
692 | * (1, 2, 3, ...) | |
693 | */ | |
694 | static VariLenAffix affixForIndex(uint64_t index) | |
695 | { | |
696 | VariLenAffix prefix; | |
697 | prefix = expGolombEncode(index, EXP_GOLOMB_K); | |
698 | return invertAffix(&prefix); /* convert prefix to suffix */ | |
699 | } | |
700 | ||
1a6ed33c AM |
701 | /* creative abuse of tb_hash_func7, which is based on xxhash */ |
702 | static uint32_t qpp_hash(QppEntry e) | |
703 | { | |
704 | return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); | |
705 | } | |
706 | ||
f3fe4a2d AM |
707 | static uint32_t qpf_hash(QpfEntry e) |
708 | { | |
709 | return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); | |
710 | } | |
711 | ||
6b6aa828 CS |
712 | static bool qpd_cmp_func(const void *obj, const void *userp) |
713 | { | |
714 | const QpdEntry *e1 = obj, *e2 = userp; | |
715 | return e1->dev == e2->dev; | |
716 | } | |
717 | ||
718 | static bool qpp_cmp_func(const void *obj, const void *userp) | |
1a6ed33c AM |
719 | { |
720 | const QppEntry *e1 = obj, *e2 = userp; | |
721 | return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; | |
722 | } | |
723 | ||
6b6aa828 | 724 | static bool qpf_cmp_func(const void *obj, const void *userp) |
f3fe4a2d AM |
725 | { |
726 | const QpfEntry *e1 = obj, *e2 = userp; | |
727 | return e1->dev == e2->dev && e1->ino == e2->ino; | |
728 | } | |
729 | ||
730 | static void qp_table_remove(void *p, uint32_t h, void *up) | |
1a6ed33c AM |
731 | { |
732 | g_free(p); | |
733 | } | |
734 | ||
f3fe4a2d | 735 | static void qp_table_destroy(struct qht *ht) |
1a6ed33c AM |
736 | { |
737 | if (!ht || !ht->map) { | |
738 | return; | |
739 | } | |
f3fe4a2d | 740 | qht_iter(ht, qp_table_remove, NULL); |
1a6ed33c AM |
741 | qht_destroy(ht); |
742 | } | |
743 | ||
6b6aa828 CS |
744 | static void qpd_table_init(struct qht *ht) |
745 | { | |
746 | qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); | |
747 | } | |
748 | ||
1a6ed33c AM |
749 | static void qpp_table_init(struct qht *ht) |
750 | { | |
6b6aa828 | 751 | qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); |
1a6ed33c AM |
752 | } |
753 | ||
f3fe4a2d AM |
754 | static void qpf_table_init(struct qht *ht) |
755 | { | |
6b6aa828 CS |
756 | qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); |
757 | } | |
758 | ||
759 | /* | |
760 | * Returns how many (high end) bits of inode numbers of the passed fs | |
761 | * device shall be used (in combination with the device number) to | |
762 | * generate hash values for qpp_table entries. | |
763 | * | |
764 | * This function is required if variable length suffixes are used for inode | |
765 | * number mapping on guest level. Since a device may end up having multiple | |
766 | * entries in qpp_table, each entry most probably with a different suffix | |
767 | * length, we thus need this function in conjunction with qpd_table to | |
768 | * "agree" about a fix amount of bits (per device) to be always used for | |
769 | * generating hash values for the purpose of accessing qpp_table in order | |
770 | * get consistent behaviour when accessing qpp_table. | |
771 | */ | |
772 | static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) | |
773 | { | |
774 | QpdEntry lookup = { | |
775 | .dev = dev | |
776 | }, *val; | |
777 | uint32_t hash = dev; | |
778 | VariLenAffix affix; | |
779 | ||
780 | val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); | |
781 | if (!val) { | |
782 | val = g_malloc0(sizeof(QpdEntry)); | |
783 | *val = lookup; | |
784 | affix = affixForIndex(pdu->s->qp_affix_next); | |
785 | val->prefix_bits = affix.bits; | |
786 | qht_insert(&pdu->s->qpd_table, val, hash, NULL); | |
787 | pdu->s->qp_ndevices++; | |
788 | } | |
789 | return val->prefix_bits; | |
f3fe4a2d AM |
790 | } |
791 | ||
6b6aa828 CS |
792 | /** |
793 | * @brief Slow / full mapping host inode nr -> guest inode nr. | |
794 | * | |
795 | * This function performs a slower and much more costly remapping of an | |
796 | * original file inode number on host to an appropriate different inode | |
797 | * number on guest. For every (dev, inode) combination on host a new | |
798 | * sequential number is generated, cached and exposed as inode number on | |
799 | * guest. | |
800 | * | |
801 | * This is just a "last resort" fallback solution if the much faster/cheaper | |
802 | * qid_path_suffixmap() failed. In practice this slow / full mapping is not | |
803 | * expected ever to be used at all though. | |
804 | * | |
805 | * @see qid_path_suffixmap() for details | |
806 | * | |
807 | */ | |
f3fe4a2d AM |
808 | static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, |
809 | uint64_t *path) | |
810 | { | |
811 | QpfEntry lookup = { | |
812 | .dev = stbuf->st_dev, | |
813 | .ino = stbuf->st_ino | |
814 | }, *val; | |
815 | uint32_t hash = qpf_hash(lookup); | |
6b6aa828 | 816 | VariLenAffix affix; |
f3fe4a2d AM |
817 | |
818 | val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); | |
819 | ||
820 | if (!val) { | |
821 | if (pdu->s->qp_fullpath_next == 0) { | |
822 | /* no more files can be mapped :'( */ | |
823 | error_report_once( | |
824 | "9p: No more prefixes available for remapping inodes from " | |
825 | "host to guest." | |
826 | ); | |
827 | return -ENFILE; | |
828 | } | |
829 | ||
830 | val = g_malloc0(sizeof(QppEntry)); | |
831 | *val = lookup; | |
832 | ||
833 | /* new unique inode and device combo */ | |
6b6aa828 CS |
834 | affix = affixForIndex( |
835 | 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) | |
836 | ); | |
837 | val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; | |
838 | pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); | |
f3fe4a2d AM |
839 | qht_insert(&pdu->s->qpf_table, val, hash, NULL); |
840 | } | |
841 | ||
842 | *path = val->path; | |
843 | return 0; | |
844 | } | |
845 | ||
6b6aa828 CS |
846 | /** |
847 | * @brief Quick mapping host inode nr -> guest inode nr. | |
1a6ed33c | 848 | * |
6b6aa828 CS |
849 | * This function performs quick remapping of an original file inode number |
850 | * on host to an appropriate different inode number on guest. This remapping | |
851 | * of inodes is required to avoid inode nr collisions on guest which would | |
852 | * happen if the 9p export contains more than 1 exported file system (or | |
853 | * more than 1 file system data set), because unlike on host level where the | |
854 | * files would have different device nrs, all files exported by 9p would | |
855 | * share the same device nr on guest (the device nr of the virtual 9p device | |
856 | * that is). | |
857 | * | |
858 | * Inode remapping is performed by chopping off high end bits of the original | |
859 | * inode number from host, shifting the result upwards and then assigning a | |
860 | * generated suffix number for the low end bits, where the same suffix number | |
861 | * will be shared by all inodes with the same device id AND the same high end | |
862 | * bits that have been chopped off. That approach utilizes the fact that inode | |
863 | * numbers very likely share the same high end bits (i.e. due to their common | |
864 | * sequential generation by file systems) and hence we only have to generate | |
865 | * and track a very limited amount of suffixes in practice due to that. | |
866 | * | |
867 | * We generate variable size suffixes for that purpose. The 1st generated | |
868 | * suffix will only have 1 bit and hence we only need to chop off 1 bit from | |
869 | * the original inode number. The subsequent suffixes being generated will | |
870 | * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being | |
871 | * generated will have 3 bits and hence we have to chop off 3 bits from their | |
872 | * original inodes, and so on. That approach of using variable length suffixes | |
873 | * (i.e. over fixed size ones) utilizes the fact that in practice only a very | |
874 | * limited amount of devices are shared by the same export (e.g. typically | |
875 | * less than 2 dozen devices per 9p export), so in practice we need to chop | |
876 | * off less bits than with fixed size prefixes and yet are flexible to add | |
877 | * new devices at runtime below host's export directory at any time without | |
878 | * having to reboot guest nor requiring to reconfigure guest for that. And due | |
879 | * to the very limited amount of original high end bits that we chop off that | |
880 | * way, the total amount of suffixes we need to generate is less than by using | |
881 | * fixed size prefixes and hence it also improves performance of the inode | |
882 | * remapping algorithm, and finally has the nice side effect that the inode | |
883 | * numbers on guest will be much smaller & human friendly. ;-) | |
1a6ed33c | 884 | */ |
6b6aa828 | 885 | static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, |
1a6ed33c AM |
886 | uint64_t *path) |
887 | { | |
6b6aa828 | 888 | const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); |
1a6ed33c AM |
889 | QppEntry lookup = { |
890 | .dev = stbuf->st_dev, | |
6b6aa828 | 891 | .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) |
1a6ed33c AM |
892 | }, *val; |
893 | uint32_t hash = qpp_hash(lookup); | |
894 | ||
895 | val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); | |
896 | ||
897 | if (!val) { | |
6b6aa828 CS |
898 | if (pdu->s->qp_affix_next == 0) { |
899 | /* we ran out of affixes */ | |
f3fe4a2d AM |
900 | warn_report_once( |
901 | "9p: Potential degraded performance of inode remapping" | |
1a6ed33c AM |
902 | ); |
903 | return -ENFILE; | |
904 | } | |
905 | ||
906 | val = g_malloc0(sizeof(QppEntry)); | |
907 | *val = lookup; | |
908 | ||
6b6aa828 CS |
909 | /* new unique inode affix and device combo */ |
910 | val->qp_affix_index = pdu->s->qp_affix_next++; | |
911 | val->qp_affix = affixForIndex(val->qp_affix_index); | |
1a6ed33c AM |
912 | qht_insert(&pdu->s->qpp_table, val, hash, NULL); |
913 | } | |
6b6aa828 CS |
914 | /* assuming generated affix to be suffix type, not prefix */ |
915 | *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; | |
1a6ed33c AM |
916 | return 0; |
917 | } | |
918 | ||
3b5ee9e8 | 919 | static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) |
286d5652 | 920 | { |
1a6ed33c | 921 | int err; |
286d5652 AL |
922 | size_t size; |
923 | ||
1a6ed33c AM |
924 | if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { |
925 | /* map inode+device to qid path (fast path) */ | |
6b6aa828 | 926 | err = qid_path_suffixmap(pdu, stbuf, &qidp->path); |
f3fe4a2d AM |
927 | if (err == -ENFILE) { |
928 | /* fast path didn't work, fall back to full map */ | |
929 | err = qid_path_fullmap(pdu, stbuf, &qidp->path); | |
930 | } | |
1a6ed33c AM |
931 | if (err) { |
932 | return err; | |
933 | } | |
934 | } else { | |
935 | if (pdu->s->dev_id != stbuf->st_dev) { | |
936 | if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { | |
937 | error_report_once( | |
938 | "9p: Multiple devices detected in same VirtFS export. " | |
939 | "Access of guest to additional devices is (partly) " | |
940 | "denied due to virtfs option 'multidevs=forbid' being " | |
941 | "effective." | |
942 | ); | |
943 | return -ENODEV; | |
944 | } else { | |
945 | warn_report_once( | |
946 | "9p: Multiple devices detected in same VirtFS export, " | |
947 | "which might lead to file ID collisions and severe " | |
948 | "misbehaviours on guest! You should either use a " | |
949 | "separate export for each device shared from host or " | |
950 | "use virtfs option 'multidevs=remap'!" | |
951 | ); | |
952 | } | |
953 | } | |
954 | memset(&qidp->path, 0, sizeof(qidp->path)); | |
955 | size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); | |
956 | memcpy(&qidp->path, &stbuf->st_ino, size); | |
3b5ee9e8 AM |
957 | } |
958 | ||
286d5652 AL |
959 | qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); |
960 | qidp->type = 0; | |
961 | if (S_ISDIR(stbuf->st_mode)) { | |
962 | qidp->type |= P9_QID_TYPE_DIR; | |
963 | } | |
964 | if (S_ISLNK(stbuf->st_mode)) { | |
965 | qidp->type |= P9_QID_TYPE_SYMLINK; | |
966 | } | |
3b5ee9e8 AM |
967 | |
968 | return 0; | |
286d5652 AL |
969 | } |
970 | ||
8440e22e GK |
971 | static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, |
972 | V9fsQID *qidp) | |
286d5652 AL |
973 | { |
974 | struct stat stbuf; | |
975 | int err; | |
976 | ||
bccacf6c | 977 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
8c158561 | 978 | if (err < 0) { |
286d5652 AL |
979 | return err; |
980 | } | |
3b5ee9e8 AM |
981 | err = stat_to_qid(pdu, &stbuf, qidp); |
982 | if (err < 0) { | |
983 | return err; | |
984 | } | |
286d5652 AL |
985 | return 0; |
986 | } | |
987 | ||
4b311c5f | 988 | V9fsPDU *pdu_alloc(V9fsState *s) |
9f107513 AL |
989 | { |
990 | V9fsPDU *pdu = NULL; | |
991 | ||
992 | if (!QLIST_EMPTY(&s->free_list)) { | |
bccacf6c AK |
993 | pdu = QLIST_FIRST(&s->free_list); |
994 | QLIST_REMOVE(pdu, next); | |
995 | QLIST_INSERT_HEAD(&s->active_list, pdu, next); | |
9f107513 AL |
996 | } |
997 | return pdu; | |
998 | } | |
999 | ||
4b311c5f | 1000 | void pdu_free(V9fsPDU *pdu) |
9f107513 | 1001 | { |
6868a420 | 1002 | V9fsState *s = pdu->s; |
f74e27bf GK |
1003 | |
1004 | g_assert(!pdu->cancelled); | |
1005 | QLIST_REMOVE(pdu, next); | |
1006 | QLIST_INSERT_HEAD(&s->free_list, pdu, next); | |
9f107513 AL |
1007 | } |
1008 | ||
8440e22e | 1009 | static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) |
405a549a AL |
1010 | { |
1011 | int8_t id = pdu->id + 1; /* Response */ | |
ad38ce9e | 1012 | V9fsState *s = pdu->s; |
06a37db7 | 1013 | int ret; |
405a549a | 1014 | |
fc78d5ee KF |
1015 | /* |
1016 | * The 9p spec requires that successfully cancelled pdus receive no reply. | |
1017 | * Sending a reply would confuse clients because they would | |
1018 | * assume that any EINTR is the actual result of the operation, | |
1019 | * rather than a consequence of the cancellation. However, if | |
1020 | * the operation completed (succesfully or with an error other | |
1021 | * than caused be cancellation), we do send out that reply, both | |
1022 | * for efficiency and to avoid confusing the rest of the state machine | |
1023 | * that assumes passing a non-error here will mean a successful | |
1024 | * transmission of the reply. | |
1025 | */ | |
1026 | bool discard = pdu->cancelled && len == -EINTR; | |
1027 | if (discard) { | |
1028 | trace_v9fs_rcancel(pdu->tag, pdu->id); | |
1029 | pdu->size = 0; | |
1030 | goto out_notify; | |
1031 | } | |
1032 | ||
405a549a | 1033 | if (len < 0) { |
405a549a | 1034 | int err = -len; |
8f4d1ca5 | 1035 | len = 7; |
405a549a | 1036 | |
8f4d1ca5 AB |
1037 | if (s->proto_version != V9FS_PROTO_2000L) { |
1038 | V9fsString str; | |
1039 | ||
1040 | str.data = strerror(err); | |
1041 | str.size = strlen(str.data); | |
1042 | ||
06a37db7 GK |
1043 | ret = pdu_marshal(pdu, len, "s", &str); |
1044 | if (ret < 0) { | |
1045 | goto out_notify; | |
1046 | } | |
1047 | len += ret; | |
8f4d1ca5 AB |
1048 | id = P9_RERROR; |
1049 | } | |
405a549a | 1050 | |
06a37db7 GK |
1051 | ret = pdu_marshal(pdu, len, "d", err); |
1052 | if (ret < 0) { | |
1053 | goto out_notify; | |
1054 | } | |
1055 | len += ret; | |
405a549a | 1056 | |
8f4d1ca5 AB |
1057 | if (s->proto_version == V9FS_PROTO_2000L) { |
1058 | id = P9_RLERROR; | |
1059 | } | |
7999f7e1 | 1060 | trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ |
405a549a AL |
1061 | } |
1062 | ||
1063 | /* fill out the header */ | |
06a37db7 GK |
1064 | if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { |
1065 | goto out_notify; | |
1066 | } | |
405a549a AL |
1067 | |
1068 | /* keep these in sync */ | |
1069 | pdu->size = len; | |
1070 | pdu->id = id; | |
1071 | ||
06a37db7 | 1072 | out_notify: |
a17d8659 | 1073 | pdu->s->transport->push_and_notify(pdu); |
405a549a | 1074 | |
bccacf6c | 1075 | /* Now wakeup anybody waiting in flush for this request */ |
f74e27bf GK |
1076 | if (!qemu_co_queue_next(&pdu->complete)) { |
1077 | pdu_free(pdu); | |
1078 | } | |
405a549a AL |
1079 | } |
1080 | ||
bb9e3216 AL |
1081 | static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) |
1082 | { | |
1083 | mode_t ret; | |
1084 | ||
1085 | ret = mode & 0777; | |
1086 | if (mode & P9_STAT_MODE_DIR) { | |
1087 | ret |= S_IFDIR; | |
1088 | } | |
1089 | ||
cf03eb2c AB |
1090 | if (mode & P9_STAT_MODE_SYMLINK) { |
1091 | ret |= S_IFLNK; | |
1092 | } | |
1093 | if (mode & P9_STAT_MODE_SOCKET) { | |
1094 | ret |= S_IFSOCK; | |
1095 | } | |
1096 | if (mode & P9_STAT_MODE_NAMED_PIPE) { | |
1097 | ret |= S_IFIFO; | |
1098 | } | |
1099 | if (mode & P9_STAT_MODE_DEVICE) { | |
c7e587b7 | 1100 | if (extension->size && extension->data[0] == 'c') { |
cf03eb2c AB |
1101 | ret |= S_IFCHR; |
1102 | } else { | |
1103 | ret |= S_IFBLK; | |
bb9e3216 AL |
1104 | } |
1105 | } | |
1106 | ||
01011733 | 1107 | if (!(ret & ~0777)) { |
bb9e3216 AL |
1108 | ret |= S_IFREG; |
1109 | } | |
1110 | ||
1111 | if (mode & P9_STAT_MODE_SETUID) { | |
1112 | ret |= S_ISUID; | |
1113 | } | |
1114 | if (mode & P9_STAT_MODE_SETGID) { | |
1115 | ret |= S_ISGID; | |
1116 | } | |
1117 | if (mode & P9_STAT_MODE_SETVTX) { | |
1118 | ret |= S_ISVTX; | |
1119 | } | |
1120 | ||
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | static int donttouch_stat(V9fsStat *stat) | |
1125 | { | |
1126 | if (stat->type == -1 && | |
1127 | stat->dev == -1 && | |
87032833 AM |
1128 | stat->qid.type == 0xff && |
1129 | stat->qid.version == (uint32_t) -1 && | |
1130 | stat->qid.path == (uint64_t) -1 && | |
bb9e3216 AL |
1131 | stat->mode == -1 && |
1132 | stat->atime == -1 && | |
1133 | stat->mtime == -1 && | |
1134 | stat->length == -1 && | |
1135 | !stat->name.size && | |
1136 | !stat->uid.size && | |
1137 | !stat->gid.size && | |
1138 | !stat->muid.size && | |
1139 | stat->n_uid == -1 && | |
1140 | stat->n_gid == -1 && | |
1141 | stat->n_muid == -1) { | |
1142 | return 1; | |
1143 | } | |
1144 | ||
1145 | return 0; | |
1146 | } | |
1147 | ||
ddca7f86 MK |
1148 | static void v9fs_stat_init(V9fsStat *stat) |
1149 | { | |
1150 | v9fs_string_init(&stat->name); | |
1151 | v9fs_string_init(&stat->uid); | |
1152 | v9fs_string_init(&stat->gid); | |
1153 | v9fs_string_init(&stat->muid); | |
1154 | v9fs_string_init(&stat->extension); | |
1155 | } | |
1156 | ||
bb9e3216 AL |
1157 | static void v9fs_stat_free(V9fsStat *stat) |
1158 | { | |
1159 | v9fs_string_free(&stat->name); | |
1160 | v9fs_string_free(&stat->uid); | |
1161 | v9fs_string_free(&stat->gid); | |
1162 | v9fs_string_free(&stat->muid); | |
1163 | v9fs_string_free(&stat->extension); | |
1164 | } | |
1165 | ||
1166 | static uint32_t stat_to_v9mode(const struct stat *stbuf) | |
1167 | { | |
1168 | uint32_t mode; | |
1169 | ||
1170 | mode = stbuf->st_mode & 0777; | |
1171 | if (S_ISDIR(stbuf->st_mode)) { | |
1172 | mode |= P9_STAT_MODE_DIR; | |
1173 | } | |
1174 | ||
cf03eb2c AB |
1175 | if (S_ISLNK(stbuf->st_mode)) { |
1176 | mode |= P9_STAT_MODE_SYMLINK; | |
1177 | } | |
bb9e3216 | 1178 | |
cf03eb2c AB |
1179 | if (S_ISSOCK(stbuf->st_mode)) { |
1180 | mode |= P9_STAT_MODE_SOCKET; | |
1181 | } | |
bb9e3216 | 1182 | |
cf03eb2c AB |
1183 | if (S_ISFIFO(stbuf->st_mode)) { |
1184 | mode |= P9_STAT_MODE_NAMED_PIPE; | |
1185 | } | |
bb9e3216 | 1186 | |
cf03eb2c AB |
1187 | if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { |
1188 | mode |= P9_STAT_MODE_DEVICE; | |
1189 | } | |
bb9e3216 | 1190 | |
cf03eb2c AB |
1191 | if (stbuf->st_mode & S_ISUID) { |
1192 | mode |= P9_STAT_MODE_SETUID; | |
1193 | } | |
bb9e3216 | 1194 | |
cf03eb2c AB |
1195 | if (stbuf->st_mode & S_ISGID) { |
1196 | mode |= P9_STAT_MODE_SETGID; | |
1197 | } | |
bb9e3216 | 1198 | |
cf03eb2c AB |
1199 | if (stbuf->st_mode & S_ISVTX) { |
1200 | mode |= P9_STAT_MODE_SETVTX; | |
bb9e3216 AL |
1201 | } |
1202 | ||
1203 | return mode; | |
1204 | } | |
1205 | ||
6069537f JD |
1206 | static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, |
1207 | const char *basename, | |
8440e22e GK |
1208 | const struct stat *stbuf, |
1209 | V9fsStat *v9stat) | |
bb9e3216 AL |
1210 | { |
1211 | int err; | |
bb9e3216 AL |
1212 | |
1213 | memset(v9stat, 0, sizeof(*v9stat)); | |
1214 | ||
3b5ee9e8 AM |
1215 | err = stat_to_qid(pdu, stbuf, &v9stat->qid); |
1216 | if (err < 0) { | |
1217 | return err; | |
1218 | } | |
bb9e3216 AL |
1219 | v9stat->mode = stat_to_v9mode(stbuf); |
1220 | v9stat->atime = stbuf->st_atime; | |
1221 | v9stat->mtime = stbuf->st_mtime; | |
1222 | v9stat->length = stbuf->st_size; | |
1223 | ||
abdf0086 GK |
1224 | v9fs_string_free(&v9stat->uid); |
1225 | v9fs_string_free(&v9stat->gid); | |
1226 | v9fs_string_free(&v9stat->muid); | |
bb9e3216 | 1227 | |
cf03eb2c AB |
1228 | v9stat->n_uid = stbuf->st_uid; |
1229 | v9stat->n_gid = stbuf->st_gid; | |
1230 | v9stat->n_muid = 0; | |
bb9e3216 | 1231 | |
abdf0086 | 1232 | v9fs_string_free(&v9stat->extension); |
bb9e3216 | 1233 | |
cf03eb2c | 1234 | if (v9stat->mode & P9_STAT_MODE_SYMLINK) { |
6069537f | 1235 | err = v9fs_co_readlink(pdu, path, &v9stat->extension); |
7a5ca31e | 1236 | if (err < 0) { |
cf03eb2c | 1237 | return err; |
bb9e3216 | 1238 | } |
cf03eb2c AB |
1239 | } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { |
1240 | v9fs_string_sprintf(&v9stat->extension, "%c %u %u", | |
1241 | S_ISCHR(stbuf->st_mode) ? 'c' : 'b', | |
1242 | major(stbuf->st_rdev), minor(stbuf->st_rdev)); | |
1243 | } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { | |
c9ba47dc SW |
1244 | v9fs_string_sprintf(&v9stat->extension, "%s %lu", |
1245 | "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); | |
bb9e3216 AL |
1246 | } |
1247 | ||
6069537f | 1248 | v9fs_string_sprintf(&v9stat->name, "%s", basename); |
bb9e3216 AL |
1249 | |
1250 | v9stat->size = 61 + | |
1251 | v9fs_string_size(&v9stat->name) + | |
1252 | v9fs_string_size(&v9stat->uid) + | |
1253 | v9fs_string_size(&v9stat->gid) + | |
1254 | v9fs_string_size(&v9stat->muid) + | |
1255 | v9fs_string_size(&v9stat->extension); | |
1256 | return 0; | |
1257 | } | |
1258 | ||
00ede4c2 SK |
1259 | #define P9_STATS_MODE 0x00000001ULL |
1260 | #define P9_STATS_NLINK 0x00000002ULL | |
1261 | #define P9_STATS_UID 0x00000004ULL | |
1262 | #define P9_STATS_GID 0x00000008ULL | |
1263 | #define P9_STATS_RDEV 0x00000010ULL | |
1264 | #define P9_STATS_ATIME 0x00000020ULL | |
1265 | #define P9_STATS_MTIME 0x00000040ULL | |
1266 | #define P9_STATS_CTIME 0x00000080ULL | |
1267 | #define P9_STATS_INO 0x00000100ULL | |
1268 | #define P9_STATS_SIZE 0x00000200ULL | |
1269 | #define P9_STATS_BLOCKS 0x00000400ULL | |
1270 | ||
1271 | #define P9_STATS_BTIME 0x00000800ULL | |
1272 | #define P9_STATS_GEN 0x00001000ULL | |
1273 | #define P9_STATS_DATA_VERSION 0x00002000ULL | |
1274 | ||
1275 | #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ | |
1276 | #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ | |
1277 | ||
1278 | ||
3b5ee9e8 | 1279 | static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, |
8db21ce7 | 1280 | V9fsStatDotl *v9lstat) |
00ede4c2 SK |
1281 | { |
1282 | memset(v9lstat, 0, sizeof(*v9lstat)); | |
1283 | ||
1284 | v9lstat->st_mode = stbuf->st_mode; | |
1285 | v9lstat->st_nlink = stbuf->st_nlink; | |
1286 | v9lstat->st_uid = stbuf->st_uid; | |
1287 | v9lstat->st_gid = stbuf->st_gid; | |
1288 | v9lstat->st_rdev = stbuf->st_rdev; | |
1289 | v9lstat->st_size = stbuf->st_size; | |
1290 | v9lstat->st_blksize = stbuf->st_blksize; | |
1291 | v9lstat->st_blocks = stbuf->st_blocks; | |
1292 | v9lstat->st_atime_sec = stbuf->st_atime; | |
1293 | v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; | |
1294 | v9lstat->st_mtime_sec = stbuf->st_mtime; | |
1295 | v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; | |
1296 | v9lstat->st_ctime_sec = stbuf->st_ctime; | |
1297 | v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; | |
1298 | /* Currently we only support BASIC fields in stat */ | |
1299 | v9lstat->st_result_mask = P9_STATS_BASIC; | |
1300 | ||
3b5ee9e8 | 1301 | return stat_to_qid(pdu, stbuf, &v9lstat->qid); |
00ede4c2 SK |
1302 | } |
1303 | ||
1f5a89bf AL |
1304 | static void print_sg(struct iovec *sg, int cnt) |
1305 | { | |
1306 | int i; | |
1307 | ||
1308 | printf("sg[%d]: {", cnt); | |
1309 | for (i = 0; i < cnt; i++) { | |
1310 | if (i) { | |
1311 | printf(", "); | |
1312 | } | |
1313 | printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); | |
1314 | } | |
1315 | printf("}\n"); | |
1316 | } | |
1317 | ||
2289be19 AK |
1318 | /* Will call this only for path name based fid */ |
1319 | static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) | |
8cf89e00 | 1320 | { |
2289be19 AK |
1321 | V9fsPath str; |
1322 | v9fs_path_init(&str); | |
1323 | v9fs_path_copy(&str, dst); | |
e3e83f2e | 1324 | v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); |
2289be19 | 1325 | v9fs_path_free(&str); |
8cf89e00 AL |
1326 | } |
1327 | ||
2c74c2cb MK |
1328 | static inline bool is_ro_export(FsContext *ctx) |
1329 | { | |
1330 | return ctx->export_flags & V9FS_RDONLY; | |
1331 | } | |
1332 | ||
8440e22e | 1333 | static void coroutine_fn v9fs_version(void *opaque) |
9f107513 | 1334 | { |
ddca7f86 | 1335 | ssize_t err; |
ff06030f VJ |
1336 | V9fsPDU *pdu = opaque; |
1337 | V9fsState *s = pdu->s; | |
92c1ad03 AL |
1338 | V9fsString version; |
1339 | size_t offset = 7; | |
1340 | ||
ddca7f86 MK |
1341 | v9fs_string_init(&version); |
1342 | err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); | |
1343 | if (err < 0) { | |
ddca7f86 MK |
1344 | goto out; |
1345 | } | |
c572f23a | 1346 | trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); |
92c1ad03 | 1347 | |
b41e2992 DS |
1348 | virtfs_reset(pdu); |
1349 | ||
84151514 MK |
1350 | if (!strcmp(version.data, "9P2000.u")) { |
1351 | s->proto_version = V9FS_PROTO_2000U; | |
1352 | } else if (!strcmp(version.data, "9P2000.L")) { | |
1353 | s->proto_version = V9FS_PROTO_2000L; | |
1354 | } else { | |
92c1ad03 | 1355 | v9fs_string_sprintf(&version, "unknown"); |
e16453a3 CS |
1356 | /* skip min. msize check, reporting invalid version has priority */ |
1357 | goto marshal; | |
9f107513 | 1358 | } |
92c1ad03 | 1359 | |
e16453a3 CS |
1360 | if (s->msize < P9_MIN_MSIZE) { |
1361 | err = -EMSGSIZE; | |
1362 | error_report( | |
1363 | "9pfs: Client requested msize < minimum msize (" | |
1364 | stringify(P9_MIN_MSIZE) ") supported by this server." | |
1365 | ); | |
1366 | goto out; | |
1367 | } | |
1368 | ||
62777d82 | 1369 | /* 8192 is the default msize of Linux clients */ |
c418f935 | 1370 | if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { |
62777d82 CS |
1371 | warn_report_once( |
1372 | "9p: degraded performance: a reasonable high msize should be " | |
1373 | "chosen on client/guest side (chosen msize is <= 8192). See " | |
1374 | "https://wiki.qemu.org/Documentation/9psetup#msize for details." | |
1375 | ); | |
1376 | } | |
1377 | ||
e16453a3 | 1378 | marshal: |
ddca7f86 MK |
1379 | err = pdu_marshal(pdu, offset, "ds", s->msize, &version); |
1380 | if (err < 0) { | |
ddca7f86 MK |
1381 | goto out; |
1382 | } | |
403a905b | 1383 | err += offset; |
c572f23a | 1384 | trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); |
ddca7f86 | 1385 | out: |
403a905b | 1386 | pdu_complete(pdu, err); |
92c1ad03 | 1387 | v9fs_string_free(&version); |
9f107513 AL |
1388 | } |
1389 | ||
8440e22e | 1390 | static void coroutine_fn v9fs_attach(void *opaque) |
9f107513 | 1391 | { |
ff06030f VJ |
1392 | V9fsPDU *pdu = opaque; |
1393 | V9fsState *s = pdu->s; | |
955efc47 AL |
1394 | int32_t fid, afid, n_uname; |
1395 | V9fsString uname, aname; | |
1396 | V9fsFidState *fidp; | |
955efc47 | 1397 | size_t offset = 7; |
8c158561 | 1398 | V9fsQID qid; |
955efc47 AL |
1399 | ssize_t err; |
1400 | ||
ddca7f86 MK |
1401 | v9fs_string_init(&uname); |
1402 | v9fs_string_init(&aname); | |
1403 | err = pdu_unmarshal(pdu, offset, "ddssd", &fid, | |
1404 | &afid, &uname, &aname, &n_uname); | |
1405 | if (err < 0) { | |
1406 | goto out_nofid; | |
1407 | } | |
c572f23a | 1408 | trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); |
955efc47 AL |
1409 | |
1410 | fidp = alloc_fid(s, fid); | |
1411 | if (fidp == NULL) { | |
1412 | err = -EINVAL; | |
84dfb926 | 1413 | goto out_nofid; |
9f107513 | 1414 | } |
955efc47 | 1415 | fidp->uid = n_uname; |
bccacf6c | 1416 | err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); |
2289be19 AK |
1417 | if (err < 0) { |
1418 | err = -EINVAL; | |
1419 | clunk_fid(s, fid); | |
1420 | goto out; | |
1421 | } | |
bccacf6c | 1422 | err = fid_to_qid(pdu, fidp, &qid); |
8c158561 | 1423 | if (err < 0) { |
955efc47 | 1424 | err = -EINVAL; |
84dfb926 | 1425 | clunk_fid(s, fid); |
955efc47 AL |
1426 | goto out; |
1427 | } | |
fe44dc91 | 1428 | |
4cdc0789 AK |
1429 | /* |
1430 | * disable migration if we haven't done already. | |
1431 | * attach could get called multiple times for the same export. | |
1432 | */ | |
1433 | if (!s->migration_blocker) { | |
f231b88d CR |
1434 | error_setg(&s->migration_blocker, |
1435 | "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", | |
1436 | s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); | |
9261ef5e MA |
1437 | err = migrate_add_blocker(s->migration_blocker, NULL); |
1438 | if (err < 0) { | |
fe44dc91 AA |
1439 | error_free(s->migration_blocker); |
1440 | s->migration_blocker = NULL; | |
1441 | clunk_fid(s, fid); | |
1442 | goto out; | |
1443 | } | |
1444 | s->root_fid = fid; | |
1445 | } | |
1446 | ||
1447 | err = pdu_marshal(pdu, offset, "Q", &qid); | |
1448 | if (err < 0) { | |
1449 | clunk_fid(s, fid); | |
1450 | goto out; | |
4cdc0789 | 1451 | } |
fe44dc91 AA |
1452 | err += offset; |
1453 | ||
1454 | memcpy(&s->root_qid, &qid, sizeof(qid)); | |
1455 | trace_v9fs_attach_return(pdu->tag, pdu->id, | |
1456 | qid.type, qid.version, qid.path); | |
955efc47 | 1457 | out: |
bccacf6c | 1458 | put_fid(pdu, fidp); |
84dfb926 | 1459 | out_nofid: |
dc295f83 | 1460 | pdu_complete(pdu, err); |
955efc47 AL |
1461 | v9fs_string_free(&uname); |
1462 | v9fs_string_free(&aname); | |
9f107513 AL |
1463 | } |
1464 | ||
8440e22e | 1465 | static void coroutine_fn v9fs_stat(void *opaque) |
9f107513 | 1466 | { |
4da7d3fa | 1467 | int32_t fid; |
d8e0c29e | 1468 | V9fsStat v9stat; |
4da7d3fa | 1469 | ssize_t err = 0; |
d8e0c29e AK |
1470 | size_t offset = 7; |
1471 | struct stat stbuf; | |
1472 | V9fsFidState *fidp; | |
1473 | V9fsPDU *pdu = opaque; | |
6069537f | 1474 | char *basename; |
4da7d3fa | 1475 | |
ddca7f86 MK |
1476 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
1477 | if (err < 0) { | |
1478 | goto out_nofid; | |
1479 | } | |
c572f23a | 1480 | trace_v9fs_stat(pdu->tag, pdu->id, fid); |
84dfb926 | 1481 | |
bccacf6c | 1482 | fidp = get_fid(pdu, fid); |
d8e0c29e | 1483 | if (fidp == NULL) { |
4da7d3fa | 1484 | err = -ENOENT; |
84dfb926 | 1485 | goto out_nofid; |
9f107513 | 1486 | } |
bccacf6c | 1487 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
d8e0c29e AK |
1488 | if (err < 0) { |
1489 | goto out; | |
1490 | } | |
6069537f JD |
1491 | basename = g_path_get_basename(fidp->path.data); |
1492 | err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); | |
1493 | g_free(basename); | |
d8e0c29e AK |
1494 | if (err < 0) { |
1495 | goto out; | |
1496 | } | |
ddca7f86 MK |
1497 | err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); |
1498 | if (err < 0) { | |
1499 | v9fs_stat_free(&v9stat); | |
1500 | goto out; | |
1501 | } | |
7999f7e1 AK |
1502 | trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, |
1503 | v9stat.atime, v9stat.mtime, v9stat.length); | |
ddca7f86 | 1504 | err += offset; |
d8e0c29e | 1505 | v9fs_stat_free(&v9stat); |
4da7d3fa | 1506 | out: |
bccacf6c | 1507 | put_fid(pdu, fidp); |
84dfb926 | 1508 | out_nofid: |
dc295f83 | 1509 | pdu_complete(pdu, err); |
9f107513 AL |
1510 | } |
1511 | ||
8440e22e | 1512 | static void coroutine_fn v9fs_getattr(void *opaque) |
00ede4c2 SK |
1513 | { |
1514 | int32_t fid; | |
8db21ce7 AK |
1515 | size_t offset = 7; |
1516 | ssize_t retval = 0; | |
1517 | struct stat stbuf; | |
00ede4c2 SK |
1518 | V9fsFidState *fidp; |
1519 | uint64_t request_mask; | |
8db21ce7 AK |
1520 | V9fsStatDotl v9stat_dotl; |
1521 | V9fsPDU *pdu = opaque; | |
00ede4c2 | 1522 | |
ddca7f86 MK |
1523 | retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); |
1524 | if (retval < 0) { | |
1525 | goto out_nofid; | |
1526 | } | |
c572f23a | 1527 | trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); |
00ede4c2 | 1528 | |
bccacf6c | 1529 | fidp = get_fid(pdu, fid); |
00ede4c2 | 1530 | if (fidp == NULL) { |
8db21ce7 | 1531 | retval = -ENOENT; |
84dfb926 | 1532 | goto out_nofid; |
00ede4c2 | 1533 | } |
8db21ce7 AK |
1534 | /* |
1535 | * Currently we only support BASIC fields in stat, so there is no | |
00ede4c2 SK |
1536 | * need to look at request_mask. |
1537 | */ | |
bccacf6c | 1538 | retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
8db21ce7 AK |
1539 | if (retval < 0) { |
1540 | goto out; | |
1541 | } | |
3b5ee9e8 AM |
1542 | retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); |
1543 | if (retval < 0) { | |
1544 | goto out; | |
1545 | } | |
e06a765e HPB |
1546 | |
1547 | /* fill st_gen if requested and supported by underlying fs */ | |
1548 | if (request_mask & P9_STATS_GEN) { | |
1549 | retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); | |
f8b7ee38 KS |
1550 | switch (retval) { |
1551 | case 0: | |
1552 | /* we have valid st_gen: update result mask */ | |
1553 | v9stat_dotl.st_result_mask |= P9_STATS_GEN; | |
1554 | break; | |
1555 | case -EINTR: | |
1556 | /* request cancelled, e.g. by Tflush */ | |
e06a765e | 1557 | goto out; |
f8b7ee38 KS |
1558 | default: |
1559 | /* failed to get st_gen: not fatal, ignore */ | |
1560 | break; | |
e06a765e | 1561 | } |
e06a765e | 1562 | } |
ddca7f86 MK |
1563 | retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); |
1564 | if (retval < 0) { | |
1565 | goto out; | |
1566 | } | |
1567 | retval += offset; | |
c572f23a HPB |
1568 | trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, |
1569 | v9stat_dotl.st_mode, v9stat_dotl.st_uid, | |
1570 | v9stat_dotl.st_gid); | |
7999f7e1 AK |
1571 | out: |
1572 | put_fid(pdu, fidp); | |
1573 | out_nofid: | |
dc295f83 | 1574 | pdu_complete(pdu, retval); |
00ede4c2 SK |
1575 | } |
1576 | ||
e4027caf AK |
1577 | /* Attribute flags */ |
1578 | #define P9_ATTR_MODE (1 << 0) | |
1579 | #define P9_ATTR_UID (1 << 1) | |
1580 | #define P9_ATTR_GID (1 << 2) | |
1581 | #define P9_ATTR_SIZE (1 << 3) | |
1582 | #define P9_ATTR_ATIME (1 << 4) | |
1583 | #define P9_ATTR_MTIME (1 << 5) | |
1584 | #define P9_ATTR_CTIME (1 << 6) | |
1585 | #define P9_ATTR_ATIME_SET (1 << 7) | |
1586 | #define P9_ATTR_MTIME_SET (1 << 8) | |
1587 | ||
1588 | #define P9_ATTR_MASK 127 | |
c79ce737 | 1589 | |
8440e22e | 1590 | static void coroutine_fn v9fs_setattr(void *opaque) |
c79ce737 | 1591 | { |
65c05f9a AK |
1592 | int err = 0; |
1593 | int32_t fid; | |
1594 | V9fsFidState *fidp; | |
1595 | size_t offset = 7; | |
1596 | V9fsIattr v9iattr; | |
1597 | V9fsPDU *pdu = opaque; | |
c79ce737 | 1598 | |
ddca7f86 MK |
1599 | err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); |
1600 | if (err < 0) { | |
1601 | goto out_nofid; | |
1602 | } | |
c79ce737 | 1603 | |
8f9c64bf GK |
1604 | trace_v9fs_setattr(pdu->tag, pdu->id, fid, |
1605 | v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, | |
1606 | v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); | |
1607 | ||
bccacf6c | 1608 | fidp = get_fid(pdu, fid); |
65c05f9a AK |
1609 | if (fidp == NULL) { |
1610 | err = -EINVAL; | |
84dfb926 | 1611 | goto out_nofid; |
c79ce737 | 1612 | } |
e4027caf | 1613 | if (v9iattr.valid & P9_ATTR_MODE) { |
bccacf6c | 1614 | err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); |
65c05f9a AK |
1615 | if (err < 0) { |
1616 | goto out; | |
c79ce737 | 1617 | } |
c79ce737 | 1618 | } |
e4027caf | 1619 | if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { |
c79ce737 | 1620 | struct timespec times[2]; |
e4027caf AK |
1621 | if (v9iattr.valid & P9_ATTR_ATIME) { |
1622 | if (v9iattr.valid & P9_ATTR_ATIME_SET) { | |
65c05f9a AK |
1623 | times[0].tv_sec = v9iattr.atime_sec; |
1624 | times[0].tv_nsec = v9iattr.atime_nsec; | |
c79ce737 SK |
1625 | } else { |
1626 | times[0].tv_nsec = UTIME_NOW; | |
1627 | } | |
1628 | } else { | |
1629 | times[0].tv_nsec = UTIME_OMIT; | |
1630 | } | |
e4027caf AK |
1631 | if (v9iattr.valid & P9_ATTR_MTIME) { |
1632 | if (v9iattr.valid & P9_ATTR_MTIME_SET) { | |
65c05f9a AK |
1633 | times[1].tv_sec = v9iattr.mtime_sec; |
1634 | times[1].tv_nsec = v9iattr.mtime_nsec; | |
c79ce737 SK |
1635 | } else { |
1636 | times[1].tv_nsec = UTIME_NOW; | |
1637 | } | |
1638 | } else { | |
1639 | times[1].tv_nsec = UTIME_OMIT; | |
1640 | } | |
bccacf6c | 1641 | err = v9fs_co_utimensat(pdu, &fidp->path, times); |
65c05f9a AK |
1642 | if (err < 0) { |
1643 | goto out; | |
1644 | } | |
c79ce737 | 1645 | } |
65c05f9a AK |
1646 | /* |
1647 | * If the only valid entry in iattr is ctime we can call | |
1648 | * chown(-1,-1) to update the ctime of the file | |
1649 | */ | |
e4027caf AK |
1650 | if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || |
1651 | ((v9iattr.valid & P9_ATTR_CTIME) | |
1652 | && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { | |
1653 | if (!(v9iattr.valid & P9_ATTR_UID)) { | |
65c05f9a AK |
1654 | v9iattr.uid = -1; |
1655 | } | |
e4027caf | 1656 | if (!(v9iattr.valid & P9_ATTR_GID)) { |
65c05f9a AK |
1657 | v9iattr.gid = -1; |
1658 | } | |
bccacf6c | 1659 | err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, |
65c05f9a AK |
1660 | v9iattr.gid); |
1661 | if (err < 0) { | |
1662 | goto out; | |
1663 | } | |
c79ce737 | 1664 | } |
e4027caf | 1665 | if (v9iattr.valid & (P9_ATTR_SIZE)) { |
bccacf6c | 1666 | err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); |
65c05f9a AK |
1667 | if (err < 0) { |
1668 | goto out; | |
1669 | } | |
c79ce737 | 1670 | } |
65c05f9a | 1671 | err = offset; |
8f9c64bf | 1672 | trace_v9fs_setattr_return(pdu->tag, pdu->id); |
c79ce737 | 1673 | out: |
bccacf6c | 1674 | put_fid(pdu, fidp); |
84dfb926 | 1675 | out_nofid: |
dc295f83 | 1676 | pdu_complete(pdu, err); |
c79ce737 SK |
1677 | } |
1678 | ||
3cc19c0c | 1679 | static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) |
ff5e54c9 AL |
1680 | { |
1681 | int i; | |
ddca7f86 | 1682 | ssize_t err; |
3cc19c0c | 1683 | size_t offset = 7; |
ddca7f86 MK |
1684 | |
1685 | err = pdu_marshal(pdu, offset, "w", nwnames); | |
1686 | if (err < 0) { | |
1687 | return err; | |
1688 | } | |
1689 | offset += err; | |
3cc19c0c | 1690 | for (i = 0; i < nwnames; i++) { |
ddca7f86 MK |
1691 | err = pdu_marshal(pdu, offset, "Q", &qids[i]); |
1692 | if (err < 0) { | |
1693 | return err; | |
1694 | } | |
1695 | offset += err; | |
ff5e54c9 | 1696 | } |
3cc19c0c | 1697 | return offset; |
ff5e54c9 AL |
1698 | } |
1699 | ||
fff39a7a GK |
1700 | static bool name_is_illegal(const char *name) |
1701 | { | |
1702 | return !*name || strchr(name, '/') != NULL; | |
1703 | } | |
1704 | ||
56f101ec GK |
1705 | static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2) |
1706 | { | |
1707 | return | |
1708 | qid1->type != qid2->type || | |
1709 | qid1->version != qid2->version || | |
1710 | qid1->path != qid2->path; | |
1711 | } | |
1712 | ||
8440e22e | 1713 | static void coroutine_fn v9fs_walk(void *opaque) |
9f107513 | 1714 | { |
3cc19c0c AK |
1715 | int name_idx; |
1716 | V9fsQID *qids = NULL; | |
1717 | int i, err = 0; | |
2289be19 | 1718 | V9fsPath dpath, path; |
3cc19c0c AK |
1719 | uint16_t nwnames; |
1720 | struct stat stbuf; | |
1721 | size_t offset = 7; | |
1722 | int32_t fid, newfid; | |
1723 | V9fsString *wnames = NULL; | |
1724 | V9fsFidState *fidp; | |
3a93113a | 1725 | V9fsFidState *newfidp = NULL; |
ff06030f VJ |
1726 | V9fsPDU *pdu = opaque; |
1727 | V9fsState *s = pdu->s; | |
56f101ec | 1728 | V9fsQID qid; |
ff5e54c9 | 1729 | |
ddca7f86 MK |
1730 | err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); |
1731 | if (err < 0) { | |
dc295f83 | 1732 | pdu_complete(pdu, err); |
ddca7f86 MK |
1733 | return ; |
1734 | } | |
1735 | offset += err; | |
ff5e54c9 | 1736 | |
c572f23a HPB |
1737 | trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); |
1738 | ||
3cc19c0c | 1739 | if (nwnames && nwnames <= P9_MAXWELEM) { |
1923923b GK |
1740 | wnames = g_new0(V9fsString, nwnames); |
1741 | qids = g_new0(V9fsQID, nwnames); | |
3cc19c0c | 1742 | for (i = 0; i < nwnames; i++) { |
ddca7f86 MK |
1743 | err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); |
1744 | if (err < 0) { | |
1745 | goto out_nofid; | |
1746 | } | |
fff39a7a GK |
1747 | if (name_is_illegal(wnames[i].data)) { |
1748 | err = -ENOENT; | |
1749 | goto out_nofid; | |
1750 | } | |
ddca7f86 | 1751 | offset += err; |
ff5e54c9 | 1752 | } |
3cc19c0c | 1753 | } else if (nwnames > P9_MAXWELEM) { |
4f8dee2d | 1754 | err = -EINVAL; |
84dfb926 | 1755 | goto out_nofid; |
ff5e54c9 | 1756 | } |
bccacf6c | 1757 | fidp = get_fid(pdu, fid); |
3cc19c0c | 1758 | if (fidp == NULL) { |
ff5e54c9 | 1759 | err = -ENOENT; |
84dfb926 | 1760 | goto out_nofid; |
ff5e54c9 | 1761 | } |
56f101ec | 1762 | |
13fd08e6 GK |
1763 | v9fs_path_init(&dpath); |
1764 | v9fs_path_init(&path); | |
1765 | ||
56f101ec GK |
1766 | err = fid_to_qid(pdu, fidp, &qid); |
1767 | if (err < 0) { | |
1768 | goto out; | |
1769 | } | |
1770 | ||
2289be19 AK |
1771 | /* |
1772 | * Both dpath and path initially poin to fidp. | |
1773 | * Needed to handle request with nwnames == 0 | |
1774 | */ | |
1775 | v9fs_path_copy(&dpath, &fidp->path); | |
1776 | v9fs_path_copy(&path, &fidp->path); | |
1777 | for (name_idx = 0; name_idx < nwnames; name_idx++) { | |
56f101ec GK |
1778 | if (not_same_qid(&pdu->s->root_qid, &qid) || |
1779 | strcmp("..", wnames[name_idx].data)) { | |
1780 | err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, | |
1781 | &path); | |
1782 | if (err < 0) { | |
1783 | goto out; | |
1784 | } | |
1785 | ||
1786 | err = v9fs_co_lstat(pdu, &path, &stbuf); | |
1787 | if (err < 0) { | |
1788 | goto out; | |
1789 | } | |
3b5ee9e8 AM |
1790 | err = stat_to_qid(pdu, &stbuf, &qid); |
1791 | if (err < 0) { | |
1792 | goto out; | |
1793 | } | |
56f101ec | 1794 | v9fs_path_copy(&dpath, &path); |
2289be19 | 1795 | } |
56f101ec | 1796 | memcpy(&qids[name_idx], &qid, sizeof(qid)); |
2289be19 | 1797 | } |
ff5e54c9 | 1798 | if (fid == newfid) { |
49dd946b GK |
1799 | if (fidp->fid_type != P9_FID_NONE) { |
1800 | err = -EINVAL; | |
1801 | goto out; | |
1802 | } | |
5b3c77aa | 1803 | v9fs_path_write_lock(s); |
2289be19 | 1804 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 1805 | v9fs_path_unlock(s); |
ff5e54c9 | 1806 | } else { |
3cc19c0c AK |
1807 | newfidp = alloc_fid(s, newfid); |
1808 | if (newfidp == NULL) { | |
ff5e54c9 AL |
1809 | err = -EINVAL; |
1810 | goto out; | |
1811 | } | |
3cc19c0c | 1812 | newfidp->uid = fidp->uid; |
2289be19 | 1813 | v9fs_path_copy(&newfidp->path, &path); |
9f107513 | 1814 | } |
3cc19c0c | 1815 | err = v9fs_walk_marshal(pdu, nwnames, qids); |
7999f7e1 | 1816 | trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); |
ff5e54c9 | 1817 | out: |
bccacf6c | 1818 | put_fid(pdu, fidp); |
84dfb926 | 1819 | if (newfidp) { |
bccacf6c | 1820 | put_fid(pdu, newfidp); |
84dfb926 | 1821 | } |
2289be19 AK |
1822 | v9fs_path_free(&dpath); |
1823 | v9fs_path_free(&path); | |
84dfb926 | 1824 | out_nofid: |
dc295f83 | 1825 | pdu_complete(pdu, err); |
3cc19c0c AK |
1826 | if (nwnames && nwnames <= P9_MAXWELEM) { |
1827 | for (name_idx = 0; name_idx < nwnames; name_idx++) { | |
1828 | v9fs_string_free(&wnames[name_idx]); | |
1829 | } | |
1830 | g_free(wnames); | |
1831 | g_free(qids); | |
1832 | } | |
9f107513 AL |
1833 | } |
1834 | ||
8440e22e | 1835 | static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) |
5e94c103 MK |
1836 | { |
1837 | struct statfs stbuf; | |
1838 | int32_t iounit = 0; | |
bccacf6c | 1839 | V9fsState *s = pdu->s; |
5e94c103 MK |
1840 | |
1841 | /* | |
1842 | * iounit should be multiples of f_bsize (host filesystem block size | |
1843 | * and as well as less than (client msize - P9_IOHDRSZ)) | |
1844 | */ | |
bccacf6c | 1845 | if (!v9fs_co_statfs(pdu, path, &stbuf)) { |
68d654da DS |
1846 | if (stbuf.f_bsize) { |
1847 | iounit = stbuf.f_bsize; | |
1848 | iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize; | |
1849 | } | |
5e94c103 | 1850 | } |
5e94c103 MK |
1851 | if (!iounit) { |
1852 | iounit = s->msize - P9_IOHDRSZ; | |
1853 | } | |
1854 | return iounit; | |
1855 | } | |
1856 | ||
8440e22e | 1857 | static void coroutine_fn v9fs_open(void *opaque) |
5e94c103 | 1858 | { |
857bc158 | 1859 | int flags; |
857bc158 AK |
1860 | int32_t fid; |
1861 | int32_t mode; | |
1862 | V9fsQID qid; | |
7999f7e1 | 1863 | int iounit = 0; |
857bc158 AK |
1864 | ssize_t err = 0; |
1865 | size_t offset = 7; | |
1866 | struct stat stbuf; | |
1867 | V9fsFidState *fidp; | |
1868 | V9fsPDU *pdu = opaque; | |
1869 | V9fsState *s = pdu->s; | |
5e94c103 | 1870 | |
857bc158 | 1871 | if (s->proto_version == V9FS_PROTO_2000L) { |
ddca7f86 | 1872 | err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); |
857bc158 | 1873 | } else { |
67d6fa53 BH |
1874 | uint8_t modebyte; |
1875 | err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); | |
1876 | mode = modebyte; | |
ddca7f86 MK |
1877 | } |
1878 | if (err < 0) { | |
1879 | goto out_nofid; | |
857bc158 | 1880 | } |
c572f23a HPB |
1881 | trace_v9fs_open(pdu->tag, pdu->id, fid, mode); |
1882 | ||
bccacf6c | 1883 | fidp = get_fid(pdu, fid); |
857bc158 AK |
1884 | if (fidp == NULL) { |
1885 | err = -ENOENT; | |
84dfb926 | 1886 | goto out_nofid; |
a6568fe2 | 1887 | } |
49dd946b GK |
1888 | if (fidp->fid_type != P9_FID_NONE) { |
1889 | err = -EINVAL; | |
1890 | goto out; | |
1891 | } | |
a6568fe2 | 1892 | |
bccacf6c | 1893 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
857bc158 | 1894 | if (err < 0) { |
a6568fe2 AL |
1895 | goto out; |
1896 | } | |
3b5ee9e8 AM |
1897 | err = stat_to_qid(pdu, &stbuf, &qid); |
1898 | if (err < 0) { | |
1899 | goto out; | |
1900 | } | |
857bc158 | 1901 | if (S_ISDIR(stbuf.st_mode)) { |
bccacf6c | 1902 | err = v9fs_co_opendir(pdu, fidp); |
857bc158 AK |
1903 | if (err < 0) { |
1904 | goto out; | |
1905 | } | |
1906 | fidp->fid_type = P9_FID_DIR; | |
ddca7f86 MK |
1907 | err = pdu_marshal(pdu, offset, "Qd", &qid, 0); |
1908 | if (err < 0) { | |
1909 | goto out; | |
1910 | } | |
1911 | err += offset; | |
a6568fe2 | 1912 | } else { |
771e9d4c | 1913 | if (s->proto_version == V9FS_PROTO_2000L) { |
d3ab98e6 | 1914 | flags = get_dotl_openflags(s, mode); |
771e9d4c | 1915 | } else { |
857bc158 | 1916 | flags = omode_to_uflags(mode); |
771e9d4c | 1917 | } |
2c74c2cb MK |
1918 | if (is_ro_export(&s->ctx)) { |
1919 | if (mode & O_WRONLY || mode & O_RDWR || | |
1920 | mode & O_APPEND || mode & O_TRUNC) { | |
1921 | err = -EROFS; | |
1922 | goto out; | |
1923 | } | |
2c74c2cb | 1924 | } |
bccacf6c | 1925 | err = v9fs_co_open(pdu, fidp, flags); |
857bc158 AK |
1926 | if (err < 0) { |
1927 | goto out; | |
1928 | } | |
1929 | fidp->fid_type = P9_FID_FILE; | |
7a462745 AK |
1930 | fidp->open_flags = flags; |
1931 | if (flags & O_EXCL) { | |
1932 | /* | |
1933 | * We let the host file system do O_EXCL check | |
1934 | * We should not reclaim such fd | |
1935 | */ | |
1936 | fidp->flags |= FID_NON_RECLAIMABLE; | |
1937 | } | |
bccacf6c | 1938 | iounit = get_iounit(pdu, &fidp->path); |
ddca7f86 MK |
1939 | err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
1940 | if (err < 0) { | |
1941 | goto out; | |
1942 | } | |
1943 | err += offset; | |
a6568fe2 | 1944 | } |
7999f7e1 AK |
1945 | trace_v9fs_open_return(pdu->tag, pdu->id, |
1946 | qid.type, qid.version, qid.path, iounit); | |
a6568fe2 | 1947 | out: |
bccacf6c | 1948 | put_fid(pdu, fidp); |
84dfb926 | 1949 | out_nofid: |
dc295f83 | 1950 | pdu_complete(pdu, err); |
a6568fe2 AL |
1951 | } |
1952 | ||
8440e22e | 1953 | static void coroutine_fn v9fs_lcreate(void *opaque) |
c1568af5 VJ |
1954 | { |
1955 | int32_t dfid, flags, mode; | |
1956 | gid_t gid; | |
c1568af5 | 1957 | ssize_t err = 0; |
36f8981f | 1958 | ssize_t offset = 7; |
36f8981f VJ |
1959 | V9fsString name; |
1960 | V9fsFidState *fidp; | |
1961 | struct stat stbuf; | |
1962 | V9fsQID qid; | |
1963 | int32_t iounit; | |
1964 | V9fsPDU *pdu = opaque; | |
c1568af5 | 1965 | |
ddca7f86 MK |
1966 | v9fs_string_init(&name); |
1967 | err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, | |
1968 | &name, &flags, &mode, &gid); | |
1969 | if (err < 0) { | |
1970 | goto out_nofid; | |
1971 | } | |
c572f23a | 1972 | trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); |
c1568af5 | 1973 | |
fff39a7a GK |
1974 | if (name_is_illegal(name.data)) { |
1975 | err = -ENOENT; | |
1976 | goto out_nofid; | |
1977 | } | |
1978 | ||
805b5d98 GK |
1979 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
1980 | err = -EEXIST; | |
1981 | goto out_nofid; | |
1982 | } | |
1983 | ||
bccacf6c | 1984 | fidp = get_fid(pdu, dfid); |
36f8981f | 1985 | if (fidp == NULL) { |
c1568af5 | 1986 | err = -ENOENT; |
84dfb926 | 1987 | goto out_nofid; |
c1568af5 | 1988 | } |
d63fb193 LQ |
1989 | if (fidp->fid_type != P9_FID_NONE) { |
1990 | err = -EINVAL; | |
1991 | goto out; | |
1992 | } | |
c1568af5 | 1993 | |
d3ab98e6 | 1994 | flags = get_dotl_openflags(pdu->s, flags); |
bccacf6c | 1995 | err = v9fs_co_open2(pdu, fidp, &name, gid, |
02cb7f3a | 1996 | flags | O_CREAT, mode, &stbuf); |
36f8981f VJ |
1997 | if (err < 0) { |
1998 | goto out; | |
1999 | } | |
2000 | fidp->fid_type = P9_FID_FILE; | |
7a462745 AK |
2001 | fidp->open_flags = flags; |
2002 | if (flags & O_EXCL) { | |
2003 | /* | |
2004 | * We let the host file system do O_EXCL check | |
2005 | * We should not reclaim such fd | |
2006 | */ | |
2007 | fidp->flags |= FID_NON_RECLAIMABLE; | |
2008 | } | |
bccacf6c | 2009 | iounit = get_iounit(pdu, &fidp->path); |
3b5ee9e8 AM |
2010 | err = stat_to_qid(pdu, &stbuf, &qid); |
2011 | if (err < 0) { | |
2012 | goto out; | |
2013 | } | |
ddca7f86 MK |
2014 | err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
2015 | if (err < 0) { | |
2016 | goto out; | |
2017 | } | |
2018 | err += offset; | |
7999f7e1 AK |
2019 | trace_v9fs_lcreate_return(pdu->tag, pdu->id, |
2020 | qid.type, qid.version, qid.path, iounit); | |
c1568af5 | 2021 | out: |
bccacf6c | 2022 | put_fid(pdu, fidp); |
84dfb926 | 2023 | out_nofid: |
dc295f83 | 2024 | pdu_complete(pdu, err); |
36f8981f | 2025 | v9fs_string_free(&name); |
c1568af5 VJ |
2026 | } |
2027 | ||
a1bf8b74 | 2028 | static void coroutine_fn v9fs_fsync(void *opaque) |
b41e95d3 | 2029 | { |
4e9ad444 | 2030 | int err; |
b41e95d3 | 2031 | int32_t fid; |
4e9ad444 | 2032 | int datasync; |
b41e95d3 VJ |
2033 | size_t offset = 7; |
2034 | V9fsFidState *fidp; | |
4e9ad444 | 2035 | V9fsPDU *pdu = opaque; |
b41e95d3 | 2036 | |
ddca7f86 MK |
2037 | err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); |
2038 | if (err < 0) { | |
2039 | goto out_nofid; | |
2040 | } | |
c572f23a HPB |
2041 | trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); |
2042 | ||
bccacf6c | 2043 | fidp = get_fid(pdu, fid); |
b41e95d3 VJ |
2044 | if (fidp == NULL) { |
2045 | err = -ENOENT; | |
84dfb926 | 2046 | goto out_nofid; |
b41e95d3 | 2047 | } |
bccacf6c | 2048 | err = v9fs_co_fsync(pdu, fidp, datasync); |
4e9ad444 AK |
2049 | if (!err) { |
2050 | err = offset; | |
2051 | } | |
bccacf6c | 2052 | put_fid(pdu, fidp); |
84dfb926 | 2053 | out_nofid: |
dc295f83 | 2054 | pdu_complete(pdu, err); |
b41e95d3 VJ |
2055 | } |
2056 | ||
8440e22e | 2057 | static void coroutine_fn v9fs_clunk(void *opaque) |
a6568fe2 | 2058 | { |
c540ee51 | 2059 | int err; |
bbd5697b AL |
2060 | int32_t fid; |
2061 | size_t offset = 7; | |
84dfb926 | 2062 | V9fsFidState *fidp; |
c540ee51 AK |
2063 | V9fsPDU *pdu = opaque; |
2064 | V9fsState *s = pdu->s; | |
bbd5697b | 2065 | |
ddca7f86 MK |
2066 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
2067 | if (err < 0) { | |
2068 | goto out_nofid; | |
2069 | } | |
c572f23a | 2070 | trace_v9fs_clunk(pdu->tag, pdu->id, fid); |
84dfb926 | 2071 | |
ce421a19 | 2072 | fidp = clunk_fid(s, fid); |
84dfb926 AK |
2073 | if (fidp == NULL) { |
2074 | err = -ENOENT; | |
2075 | goto out_nofid; | |
2076 | } | |
ce421a19 AK |
2077 | /* |
2078 | * Bump the ref so that put_fid will | |
2079 | * free the fid. | |
2080 | */ | |
2081 | fidp->ref++; | |
a911a182 AK |
2082 | err = put_fid(pdu, fidp); |
2083 | if (!err) { | |
2084 | err = offset; | |
2085 | } | |
84dfb926 | 2086 | out_nofid: |
dc295f83 | 2087 | pdu_complete(pdu, err); |
9f107513 AL |
2088 | } |
2089 | ||
bcb8998f SS |
2090 | /* |
2091 | * Create a QEMUIOVector for a sub-region of PDU iovecs | |
2092 | * | |
2093 | * @qiov: uninitialized QEMUIOVector | |
2094 | * @skip: number of bytes to skip from beginning of PDU | |
2095 | * @size: number of bytes to include | |
2096 | * @is_write: true - write, false - read | |
2097 | * | |
2098 | * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up | |
2099 | * with qemu_iovec_destroy(). | |
2100 | */ | |
2101 | static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, | |
cf45183b | 2102 | size_t skip, size_t size, |
bcb8998f SS |
2103 | bool is_write) |
2104 | { | |
2105 | QEMUIOVector elem; | |
2106 | struct iovec *iov; | |
2107 | unsigned int niov; | |
2108 | ||
88da0b03 | 2109 | if (is_write) { |
cf45183b | 2110 | pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); |
88da0b03 | 2111 | } else { |
cf45183b | 2112 | pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); |
88da0b03 | 2113 | } |
bcb8998f SS |
2114 | |
2115 | qemu_iovec_init_external(&elem, iov, niov); | |
2116 | qemu_iovec_init(qiov, niov); | |
cf45183b | 2117 | qemu_iovec_concat(qiov, &elem, skip, size); |
bcb8998f SS |
2118 | } |
2119 | ||
2f008a8c AK |
2120 | static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, |
2121 | uint64_t off, uint32_t max_count) | |
a9231555 | 2122 | { |
ddca7f86 | 2123 | ssize_t err; |
d208a0e0 | 2124 | size_t offset = 7; |
cf45183b | 2125 | uint64_t read_count; |
bcb8998f | 2126 | QEMUIOVector qiov_full; |
a9231555 | 2127 | |
7e55d65c LQ |
2128 | if (fidp->fs.xattr.len < off) { |
2129 | read_count = 0; | |
16724a17 | 2130 | } else { |
cf45183b SS |
2131 | read_count = fidp->fs.xattr.len - off; |
2132 | } | |
2133 | if (read_count > max_count) { | |
d208a0e0 | 2134 | read_count = max_count; |
a9231555 | 2135 | } |
ddca7f86 MK |
2136 | err = pdu_marshal(pdu, offset, "d", read_count); |
2137 | if (err < 0) { | |
2138 | return err; | |
2139 | } | |
2140 | offset += err; | |
00588a0a | 2141 | |
cf45183b | 2142 | v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); |
fa0eb5c5 | 2143 | err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, |
ddca7f86 MK |
2144 | ((char *)fidp->fs.xattr.value) + off, |
2145 | read_count); | |
bcb8998f | 2146 | qemu_iovec_destroy(&qiov_full); |
ddca7f86 MK |
2147 | if (err < 0) { |
2148 | return err; | |
2149 | } | |
2150 | offset += err; | |
d208a0e0 | 2151 | return offset; |
a9231555 AL |
2152 | } |
2153 | ||
8440e22e GK |
2154 | static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, |
2155 | V9fsFidState *fidp, | |
2156 | uint32_t max_count) | |
a9231555 | 2157 | { |
2289be19 | 2158 | V9fsPath path; |
d208a0e0 AK |
2159 | V9fsStat v9stat; |
2160 | int len, err = 0; | |
2161 | int32_t count = 0; | |
2162 | struct stat stbuf; | |
2163 | off_t saved_dir_pos; | |
635324e8 | 2164 | struct dirent *dent; |
a9231555 | 2165 | |
d208a0e0 | 2166 | /* save the directory position */ |
bccacf6c | 2167 | saved_dir_pos = v9fs_co_telldir(pdu, fidp); |
d208a0e0 AK |
2168 | if (saved_dir_pos < 0) { |
2169 | return saved_dir_pos; | |
a9231555 | 2170 | } |
5f524c1e | 2171 | |
d208a0e0 | 2172 | while (1) { |
2289be19 | 2173 | v9fs_path_init(&path); |
7cde47d4 GK |
2174 | |
2175 | v9fs_readdir_lock(&fidp->fs.dir); | |
2176 | ||
635324e8 GK |
2177 | err = v9fs_co_readdir(pdu, fidp, &dent); |
2178 | if (err || !dent) { | |
d208a0e0 AK |
2179 | break; |
2180 | } | |
bccacf6c | 2181 | err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); |
d208a0e0 | 2182 | if (err < 0) { |
8762a46d | 2183 | break; |
d208a0e0 | 2184 | } |
bccacf6c | 2185 | err = v9fs_co_lstat(pdu, &path, &stbuf); |
2289be19 | 2186 | if (err < 0) { |
8762a46d | 2187 | break; |
2289be19 | 2188 | } |
6069537f | 2189 | err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); |
d208a0e0 | 2190 | if (err < 0) { |
8762a46d | 2191 | break; |
a9231555 | 2192 | } |
772a7369 JD |
2193 | if ((count + v9stat.size + 2) > max_count) { |
2194 | v9fs_readdir_unlock(&fidp->fs.dir); | |
2195 | ||
2196 | /* Ran out of buffer. Set dir back to old position and return */ | |
2197 | v9fs_co_seekdir(pdu, fidp, saved_dir_pos); | |
2198 | v9fs_stat_free(&v9stat); | |
2199 | v9fs_path_free(&path); | |
2200 | return count; | |
2201 | } | |
2202 | ||
d208a0e0 AK |
2203 | /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ |
2204 | len = pdu_marshal(pdu, 11 + count, "S", &v9stat); | |
7cde47d4 GK |
2205 | |
2206 | v9fs_readdir_unlock(&fidp->fs.dir); | |
2207 | ||
772a7369 | 2208 | if (len < 0) { |
bccacf6c | 2209 | v9fs_co_seekdir(pdu, fidp, saved_dir_pos); |
d208a0e0 | 2210 | v9fs_stat_free(&v9stat); |
2289be19 | 2211 | v9fs_path_free(&path); |
772a7369 | 2212 | return len; |
d208a0e0 AK |
2213 | } |
2214 | count += len; | |
2215 | v9fs_stat_free(&v9stat); | |
2289be19 | 2216 | v9fs_path_free(&path); |
d208a0e0 | 2217 | saved_dir_pos = dent->d_off; |
a9231555 | 2218 | } |
8762a46d | 2219 | |
7cde47d4 GK |
2220 | v9fs_readdir_unlock(&fidp->fs.dir); |
2221 | ||
2289be19 | 2222 | v9fs_path_free(&path); |
d208a0e0 AK |
2223 | if (err < 0) { |
2224 | return err; | |
fa32ef88 | 2225 | } |
d208a0e0 | 2226 | return count; |
fa32ef88 AK |
2227 | } |
2228 | ||
8440e22e | 2229 | static void coroutine_fn v9fs_read(void *opaque) |
9f107513 | 2230 | { |
a9231555 | 2231 | int32_t fid; |
2f008a8c | 2232 | uint64_t off; |
a9231555 | 2233 | ssize_t err = 0; |
d208a0e0 AK |
2234 | int32_t count = 0; |
2235 | size_t offset = 7; | |
2f008a8c | 2236 | uint32_t max_count; |
d208a0e0 AK |
2237 | V9fsFidState *fidp; |
2238 | V9fsPDU *pdu = opaque; | |
2239 | V9fsState *s = pdu->s; | |
a9231555 | 2240 | |
ddca7f86 MK |
2241 | err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); |
2242 | if (err < 0) { | |
2243 | goto out_nofid; | |
2244 | } | |
c572f23a | 2245 | trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); |
84dfb926 | 2246 | |
bccacf6c | 2247 | fidp = get_fid(pdu, fid); |
d208a0e0 | 2248 | if (fidp == NULL) { |
a9231555 | 2249 | err = -EINVAL; |
84dfb926 | 2250 | goto out_nofid; |
a9231555 | 2251 | } |
d208a0e0 | 2252 | if (fidp->fid_type == P9_FID_DIR) { |
d2c5cf7c CS |
2253 | if (s->proto_version != V9FS_PROTO_2000U) { |
2254 | warn_report_once( | |
2255 | "9p: bad client: T_read request on directory only expected " | |
2256 | "with 9P2000.u protocol version" | |
2257 | ); | |
2258 | err = -EOPNOTSUPP; | |
2259 | goto out; | |
2260 | } | |
d208a0e0 | 2261 | if (off == 0) { |
bccacf6c | 2262 | v9fs_co_rewinddir(pdu, fidp); |
a9231555 | 2263 | } |
bccacf6c | 2264 | count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); |
d208a0e0 AK |
2265 | if (count < 0) { |
2266 | err = count; | |
2267 | goto out; | |
56d15a53 | 2268 | } |
ddca7f86 MK |
2269 | err = pdu_marshal(pdu, offset, "d", count); |
2270 | if (err < 0) { | |
2271 | goto out; | |
2272 | } | |
2273 | err += offset + count; | |
d208a0e0 | 2274 | } else if (fidp->fid_type == P9_FID_FILE) { |
302a0d3e SH |
2275 | QEMUIOVector qiov_full; |
2276 | QEMUIOVector qiov; | |
d208a0e0 | 2277 | int32_t len; |
d208a0e0 | 2278 | |
cf45183b | 2279 | v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); |
302a0d3e | 2280 | qemu_iovec_init(&qiov, qiov_full.niov); |
d208a0e0 | 2281 | do { |
302a0d3e | 2282 | qemu_iovec_reset(&qiov); |
1b093c48 | 2283 | qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); |
d208a0e0 | 2284 | if (0) { |
302a0d3e | 2285 | print_sg(qiov.iov, qiov.niov); |
d208a0e0 AK |
2286 | } |
2287 | /* Loop in case of EINTR */ | |
2288 | do { | |
302a0d3e | 2289 | len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); |
d208a0e0 AK |
2290 | if (len >= 0) { |
2291 | off += len; | |
2292 | count += len; | |
2293 | } | |
bccacf6c | 2294 | } while (len == -EINTR && !pdu->cancelled); |
d208a0e0 AK |
2295 | if (len < 0) { |
2296 | /* IO error return the error */ | |
2297 | err = len; | |
e95c9a49 | 2298 | goto out_free_iovec; |
d208a0e0 | 2299 | } |
d208a0e0 | 2300 | } while (count < max_count && len > 0); |
ddca7f86 MK |
2301 | err = pdu_marshal(pdu, offset, "d", count); |
2302 | if (err < 0) { | |
e95c9a49 | 2303 | goto out_free_iovec; |
ddca7f86 MK |
2304 | } |
2305 | err += offset + count; | |
e95c9a49 | 2306 | out_free_iovec: |
302a0d3e SH |
2307 | qemu_iovec_destroy(&qiov); |
2308 | qemu_iovec_destroy(&qiov_full); | |
d208a0e0 AK |
2309 | } else if (fidp->fid_type == P9_FID_XATTR) { |
2310 | err = v9fs_xattr_read(s, pdu, fidp, off, max_count); | |
a9231555 AL |
2311 | } else { |
2312 | err = -EINVAL; | |
9f107513 | 2313 | } |
7999f7e1 | 2314 | trace_v9fs_read_return(pdu->tag, pdu->id, count, err); |
a9231555 | 2315 | out: |
bccacf6c | 2316 | put_fid(pdu, fidp); |
84dfb926 | 2317 | out_nofid: |
dc295f83 | 2318 | pdu_complete(pdu, err); |
9f107513 AL |
2319 | } |
2320 | ||
29c9d2ca CS |
2321 | /** |
2322 | * Returns size required in Rreaddir response for the passed dirent @p name. | |
2323 | * | |
2324 | * @param name - directory entry's name (i.e. file name, directory name) | |
2325 | * @returns required size in bytes | |
2326 | */ | |
2327 | size_t v9fs_readdir_response_size(V9fsString *name) | |
c18e2f94 | 2328 | { |
5e4eaa79 AK |
2329 | /* |
2330 | * Size of each dirent on the wire: size of qid (13) + size of offset (8) | |
2331 | * size of type (1) + size of name.size (2) + strlen(name.data) | |
2332 | */ | |
2333 | return 24 + v9fs_string_size(name); | |
c18e2f94 SK |
2334 | } |
2335 | ||
0c4356ba CS |
2336 | static void v9fs_free_dirents(struct V9fsDirEnt *e) |
2337 | { | |
2338 | struct V9fsDirEnt *next = NULL; | |
2339 | ||
2340 | for (; e; e = next) { | |
2341 | next = e->next; | |
2342 | g_free(e->dent); | |
2343 | g_free(e->st); | |
2344 | g_free(e); | |
2345 | } | |
2346 | } | |
2347 | ||
8440e22e | 2348 | static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, |
0c4356ba | 2349 | off_t offset, int32_t max_count) |
c18e2f94 | 2350 | { |
c18e2f94 | 2351 | size_t size; |
5e4eaa79 AK |
2352 | V9fsQID qid; |
2353 | V9fsString name; | |
2354 | int len, err = 0; | |
2355 | int32_t count = 0; | |
635324e8 | 2356 | struct dirent *dent; |
0c4356ba CS |
2357 | struct stat *st; |
2358 | struct V9fsDirEnt *entries = NULL; | |
c18e2f94 | 2359 | |
0c4356ba CS |
2360 | /* |
2361 | * inode remapping requires the device id, which in turn might be | |
2362 | * different for different directory entries, so if inode remapping is | |
2363 | * enabled we have to make a full stat for each directory entry | |
2364 | */ | |
2365 | const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; | |
7cde47d4 | 2366 | |
0c4356ba CS |
2367 | /* |
2368 | * Fetch all required directory entries altogether on a background IO | |
2369 | * thread from fs driver. We don't want to do that for each entry | |
2370 | * individually, because hopping between threads (this main IO thread | |
2371 | * and background IO driver thread) would sum up to huge latencies. | |
2372 | */ | |
2373 | count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, | |
2374 | dostat); | |
2375 | if (count < 0) { | |
2376 | err = count; | |
2377 | count = 0; | |
2378 | goto out; | |
2379 | } | |
2380 | count = 0; | |
7cde47d4 | 2381 | |
0c4356ba CS |
2382 | for (struct V9fsDirEnt *e = entries; e; e = e->next) { |
2383 | dent = e->dent; | |
1a6ed33c AM |
2384 | |
2385 | if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { | |
0c4356ba CS |
2386 | st = e->st; |
2387 | /* e->st should never be NULL, but just to be sure */ | |
2388 | if (!st) { | |
2389 | err = -1; | |
2390 | break; | |
2391 | } | |
2392 | ||
2393 | /* remap inode */ | |
2394 | err = stat_to_qid(pdu, st, &qid); | |
1a6ed33c | 2395 | if (err < 0) { |
0c4356ba | 2396 | break; |
1a6ed33c AM |
2397 | } |
2398 | } else { | |
2399 | /* | |
2400 | * Fill up just the path field of qid because the client uses | |
2401 | * only that. To fill the entire qid structure we will have | |
2402 | * to stat each dirent found, which is expensive. For the | |
0c4356ba | 2403 | * latter reason we don't call stat_to_qid() here. Only drawback |
1a6ed33c AM |
2404 | * is that no multi-device export detection of stat_to_qid() |
2405 | * would be done and provided as error to the user here. But | |
2406 | * user would get that error anyway when accessing those | |
2407 | * files/dirs through other ways. | |
2408 | */ | |
2409 | size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); | |
2410 | memcpy(&qid.path, &dent->d_ino, size); | |
2411 | /* Fill the other fields with dummy values */ | |
2412 | qid.type = 0; | |
2413 | qid.version = 0; | |
2414 | } | |
c18e2f94 | 2415 | |
0c4356ba CS |
2416 | v9fs_string_init(&name); |
2417 | v9fs_string_sprintf(&name, "%s", dent->d_name); | |
2418 | ||
5e4eaa79 AK |
2419 | /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ |
2420 | len = pdu_marshal(pdu, 11 + count, "Qqbs", | |
2421 | &qid, dent->d_off, | |
2422 | dent->d_type, &name); | |
7cde47d4 | 2423 | |
0c4356ba | 2424 | v9fs_string_free(&name); |
7cde47d4 | 2425 | |
ddca7f86 | 2426 | if (len < 0) { |
0c4356ba CS |
2427 | err = len; |
2428 | break; | |
ddca7f86 | 2429 | } |
0c4356ba | 2430 | |
5e4eaa79 | 2431 | count += len; |
5e4eaa79 | 2432 | } |
7cde47d4 | 2433 | |
0c4356ba CS |
2434 | out: |
2435 | v9fs_free_dirents(entries); | |
5e4eaa79 AK |
2436 | if (err < 0) { |
2437 | return err; | |
2438 | } | |
2439 | return count; | |
c18e2f94 SK |
2440 | } |
2441 | ||
8440e22e | 2442 | static void coroutine_fn v9fs_readdir(void *opaque) |
c18e2f94 SK |
2443 | { |
2444 | int32_t fid; | |
5e4eaa79 AK |
2445 | V9fsFidState *fidp; |
2446 | ssize_t retval = 0; | |
c18e2f94 | 2447 | size_t offset = 7; |
2f008a8c AK |
2448 | uint64_t initial_offset; |
2449 | int32_t count; | |
2450 | uint32_t max_count; | |
5e4eaa79 | 2451 | V9fsPDU *pdu = opaque; |
d36a5c22 | 2452 | V9fsState *s = pdu->s; |
c18e2f94 | 2453 | |
ddca7f86 MK |
2454 | retval = pdu_unmarshal(pdu, offset, "dqd", &fid, |
2455 | &initial_offset, &max_count); | |
2456 | if (retval < 0) { | |
2457 | goto out_nofid; | |
2458 | } | |
c572f23a HPB |
2459 | trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); |
2460 | ||
d36a5c22 CS |
2461 | /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ |
2462 | if (max_count > s->msize - 11) { | |
2463 | max_count = s->msize - 11; | |
2464 | warn_report_once( | |
2465 | "9p: bad client: T_readdir with count > msize - 11" | |
2466 | ); | |
2467 | } | |
2468 | ||
bccacf6c | 2469 | fidp = get_fid(pdu, fid); |
84dfb926 AK |
2470 | if (fidp == NULL) { |
2471 | retval = -EINVAL; | |
2472 | goto out_nofid; | |
2473 | } | |
f314ea4e | 2474 | if (!fidp->fs.dir.stream) { |
5e4eaa79 | 2475 | retval = -EINVAL; |
c18e2f94 SK |
2476 | goto out; |
2477 | } | |
d2c5cf7c CS |
2478 | if (s->proto_version != V9FS_PROTO_2000L) { |
2479 | warn_report_once( | |
2480 | "9p: bad client: T_readdir request only expected with 9P2000.L " | |
2481 | "protocol version" | |
2482 | ); | |
2483 | retval = -EOPNOTSUPP; | |
2484 | goto out; | |
2485 | } | |
0c4356ba | 2486 | count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); |
5e4eaa79 AK |
2487 | if (count < 0) { |
2488 | retval = count; | |
2489 | goto out; | |
2490 | } | |
ddca7f86 MK |
2491 | retval = pdu_marshal(pdu, offset, "d", count); |
2492 | if (retval < 0) { | |
2493 | goto out; | |
2494 | } | |
2495 | retval += count + offset; | |
7999f7e1 | 2496 | trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); |
c18e2f94 | 2497 | out: |
bccacf6c | 2498 | put_fid(pdu, fidp); |
84dfb926 | 2499 | out_nofid: |
dc295f83 | 2500 | pdu_complete(pdu, retval); |
c18e2f94 SK |
2501 | } |
2502 | ||
d7a90491 | 2503 | static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, |
2f008a8c | 2504 | uint64_t off, uint32_t count, |
d7a90491 | 2505 | struct iovec *sg, int cnt) |
10b468bd AK |
2506 | { |
2507 | int i, to_copy; | |
2508 | ssize_t err = 0; | |
7e55d65c | 2509 | uint64_t write_count; |
d7a90491 | 2510 | size_t offset = 7; |
10b468bd | 2511 | |
d7a90491 | 2512 | |
7e55d65c | 2513 | if (fidp->fs.xattr.len < off) { |
b858e80a | 2514 | return -ENOSPC; |
10b468bd | 2515 | } |
7e55d65c LQ |
2516 | write_count = fidp->fs.xattr.len - off; |
2517 | if (write_count > count) { | |
2518 | write_count = count; | |
2519 | } | |
ddca7f86 MK |
2520 | err = pdu_marshal(pdu, offset, "d", write_count); |
2521 | if (err < 0) { | |
2522 | return err; | |
2523 | } | |
2524 | err += offset; | |
d7a90491 | 2525 | fidp->fs.xattr.copied_len += write_count; |
10b468bd AK |
2526 | /* |
2527 | * Now copy the content from sg list | |
2528 | */ | |
d7a90491 AK |
2529 | for (i = 0; i < cnt; i++) { |
2530 | if (write_count > sg[i].iov_len) { | |
2531 | to_copy = sg[i].iov_len; | |
10b468bd AK |
2532 | } else { |
2533 | to_copy = write_count; | |
2534 | } | |
d7a90491 | 2535 | memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); |
10b468bd | 2536 | /* updating vs->off since we are not using below */ |
d7a90491 | 2537 | off += to_copy; |
10b468bd AK |
2538 | write_count -= to_copy; |
2539 | } | |
b858e80a | 2540 | |
d7a90491 | 2541 | return err; |
10b468bd AK |
2542 | } |
2543 | ||
8440e22e | 2544 | static void coroutine_fn v9fs_write(void *opaque) |
9f107513 | 2545 | { |
d7a90491 AK |
2546 | ssize_t err; |
2547 | int32_t fid; | |
2f008a8c AK |
2548 | uint64_t off; |
2549 | uint32_t count; | |
d7a90491 AK |
2550 | int32_t len = 0; |
2551 | int32_t total = 0; | |
2552 | size_t offset = 7; | |
2553 | V9fsFidState *fidp; | |
ff06030f VJ |
2554 | V9fsPDU *pdu = opaque; |
2555 | V9fsState *s = pdu->s; | |
302a0d3e SH |
2556 | QEMUIOVector qiov_full; |
2557 | QEMUIOVector qiov; | |
8449360c | 2558 | |
ddca7f86 MK |
2559 | err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); |
2560 | if (err < 0) { | |
dc295f83 | 2561 | pdu_complete(pdu, err); |
0289a412 | 2562 | return; |
ddca7f86 MK |
2563 | } |
2564 | offset += err; | |
cf45183b | 2565 | v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); |
302a0d3e | 2566 | trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); |
84dfb926 | 2567 | |
bccacf6c | 2568 | fidp = get_fid(pdu, fid); |
d7a90491 | 2569 | if (fidp == NULL) { |
8449360c | 2570 | err = -EINVAL; |
84dfb926 | 2571 | goto out_nofid; |
9f107513 | 2572 | } |
d7a90491 AK |
2573 | if (fidp->fid_type == P9_FID_FILE) { |
2574 | if (fidp->fs.fd == -1) { | |
10b468bd AK |
2575 | err = -EINVAL; |
2576 | goto out; | |
2577 | } | |
d7a90491 | 2578 | } else if (fidp->fid_type == P9_FID_XATTR) { |
10b468bd AK |
2579 | /* |
2580 | * setxattr operation | |
2581 | */ | |
302a0d3e SH |
2582 | err = v9fs_xattr_write(s, pdu, fidp, off, count, |
2583 | qiov_full.iov, qiov_full.niov); | |
d7a90491 | 2584 | goto out; |
10b468bd | 2585 | } else { |
8449360c AL |
2586 | err = -EINVAL; |
2587 | goto out; | |
2588 | } | |
302a0d3e | 2589 | qemu_iovec_init(&qiov, qiov_full.niov); |
d7a90491 | 2590 | do { |
302a0d3e | 2591 | qemu_iovec_reset(&qiov); |
1b093c48 | 2592 | qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); |
d7a90491 | 2593 | if (0) { |
302a0d3e | 2594 | print_sg(qiov.iov, qiov.niov); |
56d15a53 | 2595 | } |
d7a90491 AK |
2596 | /* Loop in case of EINTR */ |
2597 | do { | |
302a0d3e | 2598 | len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); |
d7a90491 AK |
2599 | if (len >= 0) { |
2600 | off += len; | |
2601 | total += len; | |
2602 | } | |
bccacf6c | 2603 | } while (len == -EINTR && !pdu->cancelled); |
d7a90491 AK |
2604 | if (len < 0) { |
2605 | /* IO error return the error */ | |
2606 | err = len; | |
302a0d3e | 2607 | goto out_qiov; |
d7a90491 | 2608 | } |
d7a90491 | 2609 | } while (total < count && len > 0); |
302a0d3e SH |
2610 | |
2611 | offset = 7; | |
ddca7f86 MK |
2612 | err = pdu_marshal(pdu, offset, "d", total); |
2613 | if (err < 0) { | |
fdfcc9ae | 2614 | goto out_qiov; |
ddca7f86 MK |
2615 | } |
2616 | err += offset; | |
7999f7e1 | 2617 | trace_v9fs_write_return(pdu->tag, pdu->id, total, err); |
302a0d3e SH |
2618 | out_qiov: |
2619 | qemu_iovec_destroy(&qiov); | |
8449360c | 2620 | out: |
bccacf6c | 2621 | put_fid(pdu, fidp); |
84dfb926 | 2622 | out_nofid: |
302a0d3e | 2623 | qemu_iovec_destroy(&qiov_full); |
dc295f83 | 2624 | pdu_complete(pdu, err); |
9f107513 AL |
2625 | } |
2626 | ||
8440e22e | 2627 | static void coroutine_fn v9fs_create(void *opaque) |
5e94c103 | 2628 | { |
baaa86d9 VJ |
2629 | int32_t fid; |
2630 | int err = 0; | |
2631 | size_t offset = 7; | |
2632 | V9fsFidState *fidp; | |
2633 | V9fsQID qid; | |
2634 | int32_t perm; | |
2635 | int8_t mode; | |
2289be19 | 2636 | V9fsPath path; |
baaa86d9 VJ |
2637 | struct stat stbuf; |
2638 | V9fsString name; | |
2639 | V9fsString extension; | |
baaa86d9 VJ |
2640 | int iounit; |
2641 | V9fsPDU *pdu = opaque; | |
5b3c77aa | 2642 | V9fsState *s = pdu->s; |
c494dd6f | 2643 | |
2289be19 | 2644 | v9fs_path_init(&path); |
ddca7f86 MK |
2645 | v9fs_string_init(&name); |
2646 | v9fs_string_init(&extension); | |
2647 | err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, | |
2648 | &perm, &mode, &extension); | |
2649 | if (err < 0) { | |
2650 | goto out_nofid; | |
2651 | } | |
c572f23a HPB |
2652 | trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); |
2653 | ||
fff39a7a GK |
2654 | if (name_is_illegal(name.data)) { |
2655 | err = -ENOENT; | |
2656 | goto out_nofid; | |
2657 | } | |
2658 | ||
805b5d98 GK |
2659 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
2660 | err = -EEXIST; | |
2661 | goto out_nofid; | |
2662 | } | |
2663 | ||
bccacf6c | 2664 | fidp = get_fid(pdu, fid); |
baaa86d9 VJ |
2665 | if (fidp == NULL) { |
2666 | err = -EINVAL; | |
84dfb926 | 2667 | goto out_nofid; |
c494dd6f | 2668 | } |
d63fb193 LQ |
2669 | if (fidp->fid_type != P9_FID_NONE) { |
2670 | err = -EINVAL; | |
2671 | goto out; | |
2672 | } | |
baaa86d9 | 2673 | if (perm & P9_STAT_MODE_DIR) { |
bccacf6c | 2674 | err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, |
02cb7f3a | 2675 | fidp->uid, -1, &stbuf); |
baaa86d9 VJ |
2676 | if (err < 0) { |
2677 | goto out; | |
2678 | } | |
bccacf6c | 2679 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2680 | if (err < 0) { |
2681 | goto out; | |
2682 | } | |
5b3c77aa | 2683 | v9fs_path_write_lock(s); |
2289be19 | 2684 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2685 | v9fs_path_unlock(s); |
bccacf6c | 2686 | err = v9fs_co_opendir(pdu, fidp); |
baaa86d9 VJ |
2687 | if (err < 0) { |
2688 | goto out; | |
2689 | } | |
2690 | fidp->fid_type = P9_FID_DIR; | |
2691 | } else if (perm & P9_STAT_MODE_SYMLINK) { | |
bccacf6c | 2692 | err = v9fs_co_symlink(pdu, fidp, &name, |
02cb7f3a | 2693 | extension.data, -1 , &stbuf); |
baaa86d9 | 2694 | if (err < 0) { |
baaa86d9 VJ |
2695 | goto out; |
2696 | } | |
bccacf6c | 2697 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2698 | if (err < 0) { |
2699 | goto out; | |
2700 | } | |
5b3c77aa | 2701 | v9fs_path_write_lock(s); |
2289be19 | 2702 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2703 | v9fs_path_unlock(s); |
baaa86d9 | 2704 | } else if (perm & P9_STAT_MODE_LINK) { |
2289be19 | 2705 | int32_t ofid = atoi(extension.data); |
bccacf6c | 2706 | V9fsFidState *ofidp = get_fid(pdu, ofid); |
2289be19 | 2707 | if (ofidp == NULL) { |
baaa86d9 VJ |
2708 | err = -EINVAL; |
2709 | goto out; | |
2710 | } | |
bccacf6c AK |
2711 | err = v9fs_co_link(pdu, ofidp, fidp, &name); |
2712 | put_fid(pdu, ofidp); | |
2289be19 AK |
2713 | if (err < 0) { |
2714 | goto out; | |
2715 | } | |
bccacf6c | 2716 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
baaa86d9 | 2717 | if (err < 0) { |
2289be19 | 2718 | fidp->fid_type = P9_FID_NONE; |
baaa86d9 | 2719 | goto out; |
c494dd6f | 2720 | } |
5b3c77aa | 2721 | v9fs_path_write_lock(s); |
2289be19 | 2722 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2723 | v9fs_path_unlock(s); |
bccacf6c | 2724 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
02cb7f3a AK |
2725 | if (err < 0) { |
2726 | fidp->fid_type = P9_FID_NONE; | |
2727 | goto out; | |
2728 | } | |
baaa86d9 | 2729 | } else if (perm & P9_STAT_MODE_DEVICE) { |
c494dd6f AL |
2730 | char ctype; |
2731 | uint32_t major, minor; | |
2732 | mode_t nmode = 0; | |
2733 | ||
baaa86d9 | 2734 | if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { |
c494dd6f | 2735 | err = -errno; |
baaa86d9 | 2736 | goto out; |
c494dd6f AL |
2737 | } |
2738 | ||
2739 | switch (ctype) { | |
2740 | case 'c': | |
2741 | nmode = S_IFCHR; | |
2742 | break; | |
2743 | case 'b': | |
2744 | nmode = S_IFBLK; | |
2745 | break; | |
2746 | default: | |
2747 | err = -EIO; | |
baaa86d9 VJ |
2748 | goto out; |
2749 | } | |
c1568af5 | 2750 | |
baaa86d9 | 2751 | nmode |= perm & 0777; |
bccacf6c | 2752 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
02cb7f3a | 2753 | makedev(major, minor), nmode, &stbuf); |
baaa86d9 VJ |
2754 | if (err < 0) { |
2755 | goto out; | |
2756 | } | |
bccacf6c | 2757 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2758 | if (err < 0) { |
2759 | goto out; | |
2760 | } | |
5b3c77aa | 2761 | v9fs_path_write_lock(s); |
2289be19 | 2762 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2763 | v9fs_path_unlock(s); |
baaa86d9 | 2764 | } else if (perm & P9_STAT_MODE_NAMED_PIPE) { |
bccacf6c | 2765 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
02cb7f3a | 2766 | 0, S_IFIFO | (perm & 0777), &stbuf); |
baaa86d9 VJ |
2767 | if (err < 0) { |
2768 | goto out; | |
2769 | } | |
bccacf6c | 2770 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2771 | if (err < 0) { |
2772 | goto out; | |
2773 | } | |
5b3c77aa | 2774 | v9fs_path_write_lock(s); |
2289be19 | 2775 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2776 | v9fs_path_unlock(s); |
baaa86d9 | 2777 | } else if (perm & P9_STAT_MODE_SOCKET) { |
bccacf6c | 2778 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
02cb7f3a | 2779 | 0, S_IFSOCK | (perm & 0777), &stbuf); |
baaa86d9 VJ |
2780 | if (err < 0) { |
2781 | goto out; | |
2782 | } | |
bccacf6c | 2783 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
2289be19 AK |
2784 | if (err < 0) { |
2785 | goto out; | |
2786 | } | |
5b3c77aa | 2787 | v9fs_path_write_lock(s); |
2289be19 | 2788 | v9fs_path_copy(&fidp->path, &path); |
5b3c77aa | 2789 | v9fs_path_unlock(s); |
baaa86d9 | 2790 | } else { |
bccacf6c | 2791 | err = v9fs_co_open2(pdu, fidp, &name, -1, |
01011733 | 2792 | omode_to_uflags(mode) | O_CREAT, perm, &stbuf); |
baaa86d9 VJ |
2793 | if (err < 0) { |
2794 | goto out; | |
2795 | } | |
2796 | fidp->fid_type = P9_FID_FILE; | |
7a462745 AK |
2797 | fidp->open_flags = omode_to_uflags(mode); |
2798 | if (fidp->open_flags & O_EXCL) { | |
2799 | /* | |
2800 | * We let the host file system do O_EXCL check | |
2801 | * We should not reclaim such fd | |
2802 | */ | |
2803 | fidp->flags |= FID_NON_RECLAIMABLE; | |
2804 | } | |
c494dd6f | 2805 | } |
bccacf6c | 2806 | iounit = get_iounit(pdu, &fidp->path); |
3b5ee9e8 AM |
2807 | err = stat_to_qid(pdu, &stbuf, &qid); |
2808 | if (err < 0) { | |
2809 | goto out; | |
2810 | } | |
ddca7f86 MK |
2811 | err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
2812 | if (err < 0) { | |
2813 | goto out; | |
2814 | } | |
2815 | err += offset; | |
7999f7e1 AK |
2816 | trace_v9fs_create_return(pdu->tag, pdu->id, |
2817 | qid.type, qid.version, qid.path, iounit); | |
c494dd6f | 2818 | out: |
bccacf6c | 2819 | put_fid(pdu, fidp); |
84dfb926 | 2820 | out_nofid: |
dc295f83 | 2821 | pdu_complete(pdu, err); |
baaa86d9 VJ |
2822 | v9fs_string_free(&name); |
2823 | v9fs_string_free(&extension); | |
2289be19 | 2824 | v9fs_path_free(&path); |
9f107513 AL |
2825 | } |
2826 | ||
8440e22e | 2827 | static void coroutine_fn v9fs_symlink(void *opaque) |
08c60fc9 | 2828 | { |
ff06030f | 2829 | V9fsPDU *pdu = opaque; |
3fa2a8d1 VJ |
2830 | V9fsString name; |
2831 | V9fsString symname; | |
3fa2a8d1 VJ |
2832 | V9fsFidState *dfidp; |
2833 | V9fsQID qid; | |
2834 | struct stat stbuf; | |
08c60fc9 | 2835 | int32_t dfid; |
08c60fc9 VJ |
2836 | int err = 0; |
2837 | gid_t gid; | |
3fa2a8d1 | 2838 | size_t offset = 7; |
08c60fc9 | 2839 | |
ddca7f86 MK |
2840 | v9fs_string_init(&name); |
2841 | v9fs_string_init(&symname); | |
2842 | err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); | |
2843 | if (err < 0) { | |
2844 | goto out_nofid; | |
2845 | } | |
c572f23a | 2846 | trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); |
08c60fc9 | 2847 | |
fff39a7a GK |
2848 | if (name_is_illegal(name.data)) { |
2849 | err = -ENOENT; | |
2850 | goto out_nofid; | |
2851 | } | |
2852 | ||
805b5d98 GK |
2853 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
2854 | err = -EEXIST; | |
2855 | goto out_nofid; | |
2856 | } | |
2857 | ||
bccacf6c | 2858 | dfidp = get_fid(pdu, dfid); |
3fa2a8d1 | 2859 | if (dfidp == NULL) { |
08c60fc9 | 2860 | err = -EINVAL; |
84dfb926 | 2861 | goto out_nofid; |
08c60fc9 | 2862 | } |
bccacf6c | 2863 | err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); |
3fa2a8d1 VJ |
2864 | if (err < 0) { |
2865 | goto out; | |
2866 | } | |
3b5ee9e8 AM |
2867 | err = stat_to_qid(pdu, &stbuf, &qid); |
2868 | if (err < 0) { | |
2869 | goto out; | |
2870 | } | |
ddca7f86 MK |
2871 | err = pdu_marshal(pdu, offset, "Q", &qid); |
2872 | if (err < 0) { | |
2873 | goto out; | |
2874 | } | |
2875 | err += offset; | |
7999f7e1 AK |
2876 | trace_v9fs_symlink_return(pdu->tag, pdu->id, |
2877 | qid.type, qid.version, qid.path); | |
08c60fc9 | 2878 | out: |
bccacf6c | 2879 | put_fid(pdu, dfidp); |
84dfb926 | 2880 | out_nofid: |
dc295f83 | 2881 | pdu_complete(pdu, err); |
3fa2a8d1 VJ |
2882 | v9fs_string_free(&name); |
2883 | v9fs_string_free(&symname); | |
08c60fc9 VJ |
2884 | } |
2885 | ||
a1bf8b74 | 2886 | static void coroutine_fn v9fs_flush(void *opaque) |
9f107513 | 2887 | { |
ddca7f86 | 2888 | ssize_t err; |
bccacf6c AK |
2889 | int16_t tag; |
2890 | size_t offset = 7; | |
d5f2af7b | 2891 | V9fsPDU *cancel_pdu = NULL; |
ff06030f VJ |
2892 | V9fsPDU *pdu = opaque; |
2893 | V9fsState *s = pdu->s; | |
bccacf6c | 2894 | |
ddca7f86 MK |
2895 | err = pdu_unmarshal(pdu, offset, "w", &tag); |
2896 | if (err < 0) { | |
dc295f83 | 2897 | pdu_complete(pdu, err); |
ddca7f86 MK |
2898 | return; |
2899 | } | |
c572f23a | 2900 | trace_v9fs_flush(pdu->tag, pdu->id, tag); |
bccacf6c | 2901 | |
d5f2af7b | 2902 | if (pdu->tag == tag) { |
3dc6f869 | 2903 | warn_report("the guest sent a self-referencing 9P flush request"); |
d5f2af7b GK |
2904 | } else { |
2905 | QLIST_FOREACH(cancel_pdu, &s->active_list, next) { | |
2906 | if (cancel_pdu->tag == tag) { | |
2907 | break; | |
2908 | } | |
bccacf6c AK |
2909 | } |
2910 | } | |
2911 | if (cancel_pdu) { | |
2912 | cancel_pdu->cancelled = 1; | |
2913 | /* | |
2914 | * Wait for pdu to complete. | |
2915 | */ | |
1ace7cea | 2916 | qemu_co_queue_wait(&cancel_pdu->complete, NULL); |
18adde86 GK |
2917 | if (!qemu_co_queue_next(&cancel_pdu->complete)) { |
2918 | cancel_pdu->cancelled = 0; | |
2919 | pdu_free(cancel_pdu); | |
2920 | } | |
bccacf6c | 2921 | } |
dc295f83 | 2922 | pdu_complete(pdu, 7); |
9f107513 AL |
2923 | } |
2924 | ||
8440e22e | 2925 | static void coroutine_fn v9fs_link(void *opaque) |
b2c224be | 2926 | { |
ff06030f | 2927 | V9fsPDU *pdu = opaque; |
b2c224be VJ |
2928 | int32_t dfid, oldfid; |
2929 | V9fsFidState *dfidp, *oldfidp; | |
3a93113a | 2930 | V9fsString name; |
b2c224be VJ |
2931 | size_t offset = 7; |
2932 | int err = 0; | |
2933 | ||
ddca7f86 MK |
2934 | v9fs_string_init(&name); |
2935 | err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); | |
2936 | if (err < 0) { | |
2937 | goto out_nofid; | |
2938 | } | |
c572f23a | 2939 | trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); |
b2c224be | 2940 | |
fff39a7a GK |
2941 | if (name_is_illegal(name.data)) { |
2942 | err = -ENOENT; | |
2943 | goto out_nofid; | |
2944 | } | |
2945 | ||
805b5d98 GK |
2946 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
2947 | err = -EEXIST; | |
2948 | goto out_nofid; | |
2949 | } | |
2950 | ||
bccacf6c | 2951 | dfidp = get_fid(pdu, dfid); |
b2c224be | 2952 | if (dfidp == NULL) { |
ffd66876 | 2953 | err = -ENOENT; |
84dfb926 | 2954 | goto out_nofid; |
b2c224be VJ |
2955 | } |
2956 | ||
bccacf6c | 2957 | oldfidp = get_fid(pdu, oldfid); |
b2c224be | 2958 | if (oldfidp == NULL) { |
ffd66876 | 2959 | err = -ENOENT; |
b2c224be VJ |
2960 | goto out; |
2961 | } | |
bccacf6c | 2962 | err = v9fs_co_link(pdu, oldfidp, dfidp, &name); |
ffd66876 VJ |
2963 | if (!err) { |
2964 | err = offset; | |
b2c224be | 2965 | } |
4c158678 | 2966 | put_fid(pdu, oldfidp); |
b2c224be | 2967 | out: |
bccacf6c | 2968 | put_fid(pdu, dfidp); |
84dfb926 | 2969 | out_nofid: |
b2c224be | 2970 | v9fs_string_free(&name); |
dc295f83 | 2971 | pdu_complete(pdu, err); |
b2c224be VJ |
2972 | } |
2973 | ||
532decb7 | 2974 | /* Only works with path name based fid */ |
8440e22e | 2975 | static void coroutine_fn v9fs_remove(void *opaque) |
9f107513 | 2976 | { |
5bae1900 | 2977 | int32_t fid; |
5bae1900 | 2978 | int err = 0; |
ae1ef571 VJ |
2979 | size_t offset = 7; |
2980 | V9fsFidState *fidp; | |
2981 | V9fsPDU *pdu = opaque; | |
5bae1900 | 2982 | |
ddca7f86 MK |
2983 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
2984 | if (err < 0) { | |
2985 | goto out_nofid; | |
2986 | } | |
c572f23a | 2987 | trace_v9fs_remove(pdu->tag, pdu->id, fid); |
5bae1900 | 2988 | |
bccacf6c | 2989 | fidp = get_fid(pdu, fid); |
ae1ef571 | 2990 | if (fidp == NULL) { |
5bae1900 | 2991 | err = -EINVAL; |
84dfb926 | 2992 | goto out_nofid; |
9f107513 | 2993 | } |
532decb7 | 2994 | /* if fs driver is not path based, return EOPNOTSUPP */ |
c98f1d4a | 2995 | if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
532decb7 AK |
2996 | err = -EOPNOTSUPP; |
2997 | goto out_err; | |
2998 | } | |
7a462745 AK |
2999 | /* |
3000 | * IF the file is unlinked, we cannot reopen | |
3001 | * the file later. So don't reclaim fd | |
3002 | */ | |
bccacf6c | 3003 | err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); |
7a462745 AK |
3004 | if (err < 0) { |
3005 | goto out_err; | |
3006 | } | |
bccacf6c | 3007 | err = v9fs_co_remove(pdu, &fidp->path); |
ae1ef571 VJ |
3008 | if (!err) { |
3009 | err = offset; | |
3010 | } | |
7a462745 | 3011 | out_err: |
ae1ef571 | 3012 | /* For TREMOVE we need to clunk the fid even on failed remove */ |
84dfb926 | 3013 | clunk_fid(pdu->s, fidp->fid); |
bccacf6c | 3014 | put_fid(pdu, fidp); |
84dfb926 | 3015 | out_nofid: |
dc295f83 | 3016 | pdu_complete(pdu, err); |
9f107513 AL |
3017 | } |
3018 | ||
8440e22e | 3019 | static void coroutine_fn v9fs_unlinkat(void *opaque) |
7834cf77 AK |
3020 | { |
3021 | int err = 0; | |
3022 | V9fsString name; | |
67e87345 | 3023 | int32_t dfid, flags, rflags = 0; |
7834cf77 | 3024 | size_t offset = 7; |
2289be19 | 3025 | V9fsPath path; |
7834cf77 AK |
3026 | V9fsFidState *dfidp; |
3027 | V9fsPDU *pdu = opaque; | |
7834cf77 | 3028 | |
ddca7f86 MK |
3029 | v9fs_string_init(&name); |
3030 | err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); | |
3031 | if (err < 0) { | |
3032 | goto out_nofid; | |
3033 | } | |
fff39a7a GK |
3034 | |
3035 | if (name_is_illegal(name.data)) { | |
3036 | err = -ENOENT; | |
3037 | goto out_nofid; | |
3038 | } | |
3039 | ||
805b5d98 GK |
3040 | if (!strcmp(".", name.data)) { |
3041 | err = -EINVAL; | |
3042 | goto out_nofid; | |
3043 | } | |
3044 | ||
3045 | if (!strcmp("..", name.data)) { | |
3046 | err = -ENOTEMPTY; | |
3047 | goto out_nofid; | |
3048 | } | |
3049 | ||
67e87345 KF |
3050 | if (flags & ~P9_DOTL_AT_REMOVEDIR) { |
3051 | err = -EINVAL; | |
3052 | goto out_nofid; | |
3053 | } | |
3054 | ||
3055 | if (flags & P9_DOTL_AT_REMOVEDIR) { | |
3056 | rflags |= AT_REMOVEDIR; | |
3057 | } | |
3058 | ||
bccacf6c | 3059 | dfidp = get_fid(pdu, dfid); |
7834cf77 AK |
3060 | if (dfidp == NULL) { |
3061 | err = -EINVAL; | |
3062 | goto out_nofid; | |
3063 | } | |
7834cf77 AK |
3064 | /* |
3065 | * IF the file is unlinked, we cannot reopen | |
3066 | * the file later. So don't reclaim fd | |
3067 | */ | |
2289be19 | 3068 | v9fs_path_init(&path); |
bccacf6c | 3069 | err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); |
2289be19 AK |
3070 | if (err < 0) { |
3071 | goto out_err; | |
3072 | } | |
bccacf6c | 3073 | err = v9fs_mark_fids_unreclaim(pdu, &path); |
7834cf77 AK |
3074 | if (err < 0) { |
3075 | goto out_err; | |
3076 | } | |
67e87345 | 3077 | err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); |
7834cf77 AK |
3078 | if (!err) { |
3079 | err = offset; | |
3080 | } | |
3081 | out_err: | |
bccacf6c | 3082 | put_fid(pdu, dfidp); |
2289be19 | 3083 | v9fs_path_free(&path); |
7834cf77 | 3084 | out_nofid: |
dc295f83 | 3085 | pdu_complete(pdu, err); |
7834cf77 AK |
3086 | v9fs_string_free(&name); |
3087 | } | |
3088 | ||
2289be19 AK |
3089 | |
3090 | /* Only works with path name based fid */ | |
8440e22e GK |
3091 | static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, |
3092 | int32_t newdirfid, | |
3093 | V9fsString *name) | |
8cf89e00 | 3094 | { |
c7b4b0b3 | 3095 | int err = 0; |
2289be19 AK |
3096 | V9fsPath new_path; |
3097 | V9fsFidState *tfidp; | |
bccacf6c | 3098 | V9fsState *s = pdu->s; |
84dfb926 | 3099 | V9fsFidState *dirfidp = NULL; |
8cf89e00 | 3100 | |
2289be19 | 3101 | v9fs_path_init(&new_path); |
930b1e17 | 3102 | if (newdirfid != -1) { |
bccacf6c | 3103 | dirfidp = get_fid(pdu, newdirfid); |
c7b4b0b3 | 3104 | if (dirfidp == NULL) { |
b858e80a | 3105 | return -ENOENT; |
c7b4b0b3 | 3106 | } |
49dd946b GK |
3107 | if (fidp->fid_type != P9_FID_NONE) { |
3108 | err = -EINVAL; | |
3109 | goto out; | |
3110 | } | |
4fa62005 GK |
3111 | err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); |
3112 | if (err < 0) { | |
3113 | goto out; | |
3114 | } | |
c7b4b0b3 | 3115 | } else { |
4d8bc733 JD |
3116 | char *dir_name = g_path_get_dirname(fidp->path.data); |
3117 | V9fsPath dir_path; | |
3118 | ||
3119 | v9fs_path_init(&dir_path); | |
3120 | v9fs_path_sprintf(&dir_path, "%s", dir_name); | |
3121 | g_free(dir_name); | |
3122 | ||
3123 | err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); | |
3124 | v9fs_path_free(&dir_path); | |
4fa62005 GK |
3125 | if (err < 0) { |
3126 | goto out; | |
3127 | } | |
c7b4b0b3 | 3128 | } |
bccacf6c | 3129 | err = v9fs_co_rename(pdu, &fidp->path, &new_path); |
2289be19 AK |
3130 | if (err < 0) { |
3131 | goto out; | |
3132 | } | |
3133 | /* | |
3134 | * Fixup fid's pointing to the old name to | |
3135 | * start pointing to the new name | |
3136 | */ | |
feabd6cf | 3137 | QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { |
2289be19 AK |
3138 | if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { |
3139 | /* replace the name */ | |
3140 | v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); | |
8cf89e00 AL |
3141 | } |
3142 | } | |
c7b4b0b3 | 3143 | out: |
84dfb926 | 3144 | if (dirfidp) { |
bccacf6c | 3145 | put_fid(pdu, dirfidp); |
84dfb926 | 3146 | } |
2289be19 | 3147 | v9fs_path_free(&new_path); |
c7b4b0b3 MK |
3148 | return err; |
3149 | } | |
3150 | ||
532decb7 | 3151 | /* Only works with path name based fid */ |
8440e22e | 3152 | static void coroutine_fn v9fs_rename(void *opaque) |
c7b4b0b3 MK |
3153 | { |
3154 | int32_t fid; | |
c7b4b0b3 | 3155 | ssize_t err = 0; |
930b1e17 AK |
3156 | size_t offset = 7; |
3157 | V9fsString name; | |
3158 | int32_t newdirfid; | |
3159 | V9fsFidState *fidp; | |
3160 | V9fsPDU *pdu = opaque; | |
3161 | V9fsState *s = pdu->s; | |
c7b4b0b3 | 3162 | |
ddca7f86 MK |
3163 | v9fs_string_init(&name); |
3164 | err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); | |
3165 | if (err < 0) { | |
3166 | goto out_nofid; | |
3167 | } | |
fff39a7a GK |
3168 | |
3169 | if (name_is_illegal(name.data)) { | |
3170 | err = -ENOENT; | |
3171 | goto out_nofid; | |
3172 | } | |
3173 | ||
805b5d98 GK |
3174 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
3175 | err = -EISDIR; | |
3176 | goto out_nofid; | |
3177 | } | |
3178 | ||
bccacf6c | 3179 | fidp = get_fid(pdu, fid); |
930b1e17 | 3180 | if (fidp == NULL) { |
c7b4b0b3 | 3181 | err = -ENOENT; |
84dfb926 | 3182 | goto out_nofid; |
c7b4b0b3 | 3183 | } |
49dd946b GK |
3184 | if (fidp->fid_type != P9_FID_NONE) { |
3185 | err = -EINVAL; | |
3186 | goto out; | |
3187 | } | |
532decb7 | 3188 | /* if fs driver is not path based, return EOPNOTSUPP */ |
c98f1d4a | 3189 | if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
532decb7 AK |
3190 | err = -EOPNOTSUPP; |
3191 | goto out; | |
3192 | } | |
3193 | v9fs_path_write_lock(s); | |
bccacf6c | 3194 | err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); |
532decb7 | 3195 | v9fs_path_unlock(s); |
930b1e17 AK |
3196 | if (!err) { |
3197 | err = offset; | |
3198 | } | |
532decb7 | 3199 | out: |
bccacf6c | 3200 | put_fid(pdu, fidp); |
84dfb926 | 3201 | out_nofid: |
dc295f83 | 3202 | pdu_complete(pdu, err); |
930b1e17 | 3203 | v9fs_string_free(&name); |
c7b4b0b3 MK |
3204 | } |
3205 | ||
4fa62005 GK |
3206 | static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, |
3207 | V9fsString *old_name, | |
3208 | V9fsPath *newdir, | |
3209 | V9fsString *new_name) | |
2289be19 AK |
3210 | { |
3211 | V9fsFidState *tfidp; | |
3212 | V9fsPath oldpath, newpath; | |
bccacf6c | 3213 | V9fsState *s = pdu->s; |
4fa62005 | 3214 | int err; |
2289be19 AK |
3215 | |
3216 | v9fs_path_init(&oldpath); | |
3217 | v9fs_path_init(&newpath); | |
4fa62005 GK |
3218 | err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); |
3219 | if (err < 0) { | |
3220 | goto out; | |
3221 | } | |
3222 | err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); | |
3223 | if (err < 0) { | |
3224 | goto out; | |
3225 | } | |
2289be19 AK |
3226 | |
3227 | /* | |
3228 | * Fixup fid's pointing to the old name to | |
3229 | * start pointing to the new name | |
3230 | */ | |
feabd6cf | 3231 | QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { |
2289be19 AK |
3232 | if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { |
3233 | /* replace the name */ | |
3234 | v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); | |
3235 | } | |
3236 | } | |
4fa62005 | 3237 | out: |
2289be19 AK |
3238 | v9fs_path_free(&oldpath); |
3239 | v9fs_path_free(&newpath); | |
4fa62005 | 3240 | return err; |
2289be19 AK |
3241 | } |
3242 | ||
8440e22e GK |
3243 | static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, |
3244 | V9fsString *old_name, | |
3245 | int32_t newdirfid, | |
3246 | V9fsString *new_name) | |
89bf6593 AK |
3247 | { |
3248 | int err = 0; | |
bccacf6c | 3249 | V9fsState *s = pdu->s; |
89bf6593 AK |
3250 | V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; |
3251 | ||
bccacf6c | 3252 | olddirfidp = get_fid(pdu, olddirfid); |
89bf6593 AK |
3253 | if (olddirfidp == NULL) { |
3254 | err = -ENOENT; | |
3255 | goto out; | |
3256 | } | |
89bf6593 | 3257 | if (newdirfid != -1) { |
bccacf6c | 3258 | newdirfidp = get_fid(pdu, newdirfid); |
89bf6593 AK |
3259 | if (newdirfidp == NULL) { |
3260 | err = -ENOENT; | |
3261 | goto out; | |
3262 | } | |
89bf6593 | 3263 | } else { |
bccacf6c | 3264 | newdirfidp = get_fid(pdu, olddirfid); |
89bf6593 AK |
3265 | } |
3266 | ||
bccacf6c | 3267 | err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, |
2289be19 AK |
3268 | &newdirfidp->path, new_name); |
3269 | if (err < 0) { | |
3270 | goto out; | |
89bf6593 | 3271 | } |
c98f1d4a | 3272 | if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { |
532decb7 | 3273 | /* Only for path based fid we need to do the below fixup */ |
4fa62005 GK |
3274 | err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, |
3275 | &newdirfidp->path, new_name); | |
532decb7 | 3276 | } |
89bf6593 AK |
3277 | out: |
3278 | if (olddirfidp) { | |
bccacf6c | 3279 | put_fid(pdu, olddirfidp); |
89bf6593 AK |
3280 | } |
3281 | if (newdirfidp) { | |
bccacf6c | 3282 | put_fid(pdu, newdirfidp); |
89bf6593 | 3283 | } |
89bf6593 AK |
3284 | return err; |
3285 | } | |
3286 | ||
8440e22e | 3287 | static void coroutine_fn v9fs_renameat(void *opaque) |
89bf6593 AK |
3288 | { |
3289 | ssize_t err = 0; | |
3290 | size_t offset = 7; | |
3291 | V9fsPDU *pdu = opaque; | |
3292 | V9fsState *s = pdu->s; | |
3293 | int32_t olddirfid, newdirfid; | |
3294 | V9fsString old_name, new_name; | |
3295 | ||
ddca7f86 MK |
3296 | v9fs_string_init(&old_name); |
3297 | v9fs_string_init(&new_name); | |
3298 | err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, | |
3299 | &old_name, &newdirfid, &new_name); | |
3300 | if (err < 0) { | |
3301 | goto out_err; | |
3302 | } | |
89bf6593 | 3303 | |
fff39a7a GK |
3304 | if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { |
3305 | err = -ENOENT; | |
3306 | goto out_err; | |
3307 | } | |
3308 | ||
805b5d98 GK |
3309 | if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || |
3310 | !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { | |
3311 | err = -EISDIR; | |
3312 | goto out_err; | |
3313 | } | |
3314 | ||
532decb7 | 3315 | v9fs_path_write_lock(s); |
bccacf6c AK |
3316 | err = v9fs_complete_renameat(pdu, olddirfid, |
3317 | &old_name, newdirfid, &new_name); | |
532decb7 | 3318 | v9fs_path_unlock(s); |
89bf6593 AK |
3319 | if (!err) { |
3320 | err = offset; | |
3321 | } | |
ddca7f86 MK |
3322 | |
3323 | out_err: | |
dc295f83 | 3324 | pdu_complete(pdu, err); |
89bf6593 AK |
3325 | v9fs_string_free(&old_name); |
3326 | v9fs_string_free(&new_name); | |
3327 | } | |
3328 | ||
8440e22e | 3329 | static void coroutine_fn v9fs_wstat(void *opaque) |
8cf89e00 | 3330 | { |
b81d685e AK |
3331 | int32_t fid; |
3332 | int err = 0; | |
3333 | int16_t unused; | |
3334 | V9fsStat v9stat; | |
3335 | size_t offset = 7; | |
3336 | struct stat stbuf; | |
3337 | V9fsFidState *fidp; | |
3338 | V9fsPDU *pdu = opaque; | |
1d203986 | 3339 | V9fsState *s = pdu->s; |
8cf89e00 | 3340 | |
ddca7f86 MK |
3341 | v9fs_stat_init(&v9stat); |
3342 | err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); | |
3343 | if (err < 0) { | |
3344 | goto out_nofid; | |
3345 | } | |
c572f23a HPB |
3346 | trace_v9fs_wstat(pdu->tag, pdu->id, fid, |
3347 | v9stat.mode, v9stat.atime, v9stat.mtime); | |
84dfb926 | 3348 | |
bccacf6c | 3349 | fidp = get_fid(pdu, fid); |
b81d685e AK |
3350 | if (fidp == NULL) { |
3351 | err = -EINVAL; | |
84dfb926 | 3352 | goto out_nofid; |
8cf89e00 | 3353 | } |
b81d685e AK |
3354 | /* do we need to sync the file? */ |
3355 | if (donttouch_stat(&v9stat)) { | |
bccacf6c | 3356 | err = v9fs_co_fsync(pdu, fidp, 0); |
8cf89e00 AL |
3357 | goto out; |
3358 | } | |
b81d685e AK |
3359 | if (v9stat.mode != -1) { |
3360 | uint32_t v9_mode; | |
bccacf6c | 3361 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
b81d685e AK |
3362 | if (err < 0) { |
3363 | goto out; | |
3364 | } | |
3365 | v9_mode = stat_to_v9mode(&stbuf); | |
3366 | if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != | |
3367 | (v9_mode & P9_STAT_MODE_TYPE_BITS)) { | |
3368 | /* Attempting to change the type */ | |
3369 | err = -EIO; | |
3370 | goto out; | |
3371 | } | |
bccacf6c | 3372 | err = v9fs_co_chmod(pdu, &fidp->path, |
b81d685e AK |
3373 | v9mode_to_mode(v9stat.mode, |
3374 | &v9stat.extension)); | |
3375 | if (err < 0) { | |
3376 | goto out; | |
3377 | } | |
3378 | } | |
3379 | if (v9stat.mtime != -1 || v9stat.atime != -1) { | |
8fc39ae4 | 3380 | struct timespec times[2]; |
b81d685e AK |
3381 | if (v9stat.atime != -1) { |
3382 | times[0].tv_sec = v9stat.atime; | |
8fc39ae4 SK |
3383 | times[0].tv_nsec = 0; |
3384 | } else { | |
3385 | times[0].tv_nsec = UTIME_OMIT; | |
3386 | } | |
b81d685e AK |
3387 | if (v9stat.mtime != -1) { |
3388 | times[1].tv_sec = v9stat.mtime; | |
8fc39ae4 SK |
3389 | times[1].tv_nsec = 0; |
3390 | } else { | |
3391 | times[1].tv_nsec = UTIME_OMIT; | |
3392 | } | |
bccacf6c | 3393 | err = v9fs_co_utimensat(pdu, &fidp->path, times); |
b81d685e AK |
3394 | if (err < 0) { |
3395 | goto out; | |
8cf89e00 AL |
3396 | } |
3397 | } | |
b81d685e | 3398 | if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { |
bccacf6c | 3399 | err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); |
b81d685e | 3400 | if (err < 0) { |
8cf89e00 | 3401 | goto out; |
b81d685e | 3402 | } |
8cf89e00 | 3403 | } |
b81d685e | 3404 | if (v9stat.name.size != 0) { |
1d203986 | 3405 | v9fs_path_write_lock(s); |
bccacf6c | 3406 | err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); |
1d203986 | 3407 | v9fs_path_unlock(s); |
b81d685e AK |
3408 | if (err < 0) { |
3409 | goto out; | |
3410 | } | |
8cf89e00 | 3411 | } |
b81d685e | 3412 | if (v9stat.length != -1) { |
bccacf6c | 3413 | err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); |
b81d685e AK |
3414 | if (err < 0) { |
3415 | goto out; | |
3416 | } | |
8cf89e00 | 3417 | } |
b81d685e | 3418 | err = offset; |
8cf89e00 | 3419 | out: |
bccacf6c | 3420 | put_fid(pdu, fidp); |
84dfb926 | 3421 | out_nofid: |
b81d685e | 3422 | v9fs_stat_free(&v9stat); |
dc295f83 | 3423 | pdu_complete(pdu, err); |
9f107513 AL |
3424 | } |
3425 | ||
88a4763e AK |
3426 | static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) |
3427 | { | |
3428 | uint32_t f_type; | |
3429 | uint32_t f_bsize; | |
3430 | uint64_t f_blocks; | |
3431 | uint64_t f_bfree; | |
3432 | uint64_t f_bavail; | |
3433 | uint64_t f_files; | |
3434 | uint64_t f_ffree; | |
3435 | uint64_t fsid_val; | |
3436 | uint32_t f_namelen; | |
3437 | size_t offset = 7; | |
5e94c103 MK |
3438 | int32_t bsize_factor; |
3439 | ||
5e94c103 MK |
3440 | /* |
3441 | * compute bsize factor based on host file system block size | |
3442 | * and client msize | |
3443 | */ | |
01011733 | 3444 | bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; |
5e94c103 MK |
3445 | if (!bsize_factor) { |
3446 | bsize_factor = 1; | |
3447 | } | |
88a4763e AK |
3448 | f_type = stbuf->f_type; |
3449 | f_bsize = stbuf->f_bsize; | |
3450 | f_bsize *= bsize_factor; | |
5e94c103 MK |
3451 | /* |
3452 | * f_bsize is adjusted(multiplied) by bsize factor, so we need to | |
3453 | * adjust(divide) the number of blocks, free blocks and available | |
3454 | * blocks by bsize factor | |
3455 | */ | |
01011733 XZ |
3456 | f_blocks = stbuf->f_blocks / bsize_factor; |
3457 | f_bfree = stbuf->f_bfree / bsize_factor; | |
3458 | f_bavail = stbuf->f_bavail / bsize_factor; | |
88a4763e AK |
3459 | f_files = stbuf->f_files; |
3460 | f_ffree = stbuf->f_ffree; | |
3461 | fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | | |
3462 | (unsigned long long)stbuf->f_fsid.__val[1] << 32; | |
3463 | f_namelen = stbuf->f_namelen; | |
be940c87 | 3464 | |
88a4763e AK |
3465 | return pdu_marshal(pdu, offset, "ddqqqqqqd", |
3466 | f_type, f_bsize, f_blocks, f_bfree, | |
3467 | f_bavail, f_files, f_ffree, | |
3468 | fsid_val, f_namelen); | |
be940c87 MK |
3469 | } |
3470 | ||
8440e22e | 3471 | static void coroutine_fn v9fs_statfs(void *opaque) |
be940c87 | 3472 | { |
88a4763e AK |
3473 | int32_t fid; |
3474 | ssize_t retval = 0; | |
3475 | size_t offset = 7; | |
3476 | V9fsFidState *fidp; | |
3477 | struct statfs stbuf; | |
ff06030f VJ |
3478 | V9fsPDU *pdu = opaque; |
3479 | V9fsState *s = pdu->s; | |
be940c87 | 3480 | |
ddca7f86 MK |
3481 | retval = pdu_unmarshal(pdu, offset, "d", &fid); |
3482 | if (retval < 0) { | |
3483 | goto out_nofid; | |
3484 | } | |
bccacf6c | 3485 | fidp = get_fid(pdu, fid); |
88a4763e AK |
3486 | if (fidp == NULL) { |
3487 | retval = -ENOENT; | |
84dfb926 | 3488 | goto out_nofid; |
be940c87 | 3489 | } |
bccacf6c | 3490 | retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); |
88a4763e AK |
3491 | if (retval < 0) { |
3492 | goto out; | |
3493 | } | |
ddca7f86 MK |
3494 | retval = v9fs_fill_statfs(s, pdu, &stbuf); |
3495 | if (retval < 0) { | |
3496 | goto out; | |
3497 | } | |
3498 | retval += offset; | |
be940c87 | 3499 | out: |
bccacf6c | 3500 | put_fid(pdu, fidp); |
84dfb926 | 3501 | out_nofid: |
dc295f83 | 3502 | pdu_complete(pdu, retval); |
be940c87 MK |
3503 | } |
3504 | ||
8440e22e | 3505 | static void coroutine_fn v9fs_mknod(void *opaque) |
5268cecc | 3506 | { |
1b733fed AK |
3507 | |
3508 | int mode; | |
3509 | gid_t gid; | |
5268cecc | 3510 | int32_t fid; |
1b733fed | 3511 | V9fsQID qid; |
5268cecc | 3512 | int err = 0; |
5268cecc | 3513 | int major, minor; |
1b733fed AK |
3514 | size_t offset = 7; |
3515 | V9fsString name; | |
3516 | struct stat stbuf; | |
1b733fed AK |
3517 | V9fsFidState *fidp; |
3518 | V9fsPDU *pdu = opaque; | |
5268cecc | 3519 | |
ddca7f86 MK |
3520 | v9fs_string_init(&name); |
3521 | err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, | |
3522 | &major, &minor, &gid); | |
3523 | if (err < 0) { | |
3524 | goto out_nofid; | |
3525 | } | |
c572f23a | 3526 | trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); |
5268cecc | 3527 | |
fff39a7a GK |
3528 | if (name_is_illegal(name.data)) { |
3529 | err = -ENOENT; | |
3530 | goto out_nofid; | |
3531 | } | |
3532 | ||
805b5d98 GK |
3533 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
3534 | err = -EEXIST; | |
3535 | goto out_nofid; | |
3536 | } | |
3537 | ||
bccacf6c | 3538 | fidp = get_fid(pdu, fid); |
5268cecc MK |
3539 | if (fidp == NULL) { |
3540 | err = -ENOENT; | |
84dfb926 | 3541 | goto out_nofid; |
5268cecc | 3542 | } |
bccacf6c | 3543 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, |
02cb7f3a | 3544 | makedev(major, minor), mode, &stbuf); |
1b733fed AK |
3545 | if (err < 0) { |
3546 | goto out; | |
3547 | } | |
3b5ee9e8 AM |
3548 | err = stat_to_qid(pdu, &stbuf, &qid); |
3549 | if (err < 0) { | |
3550 | goto out; | |
3551 | } | |
ddca7f86 MK |
3552 | err = pdu_marshal(pdu, offset, "Q", &qid); |
3553 | if (err < 0) { | |
3554 | goto out; | |
3555 | } | |
3556 | err += offset; | |
7999f7e1 AK |
3557 | trace_v9fs_mknod_return(pdu->tag, pdu->id, |
3558 | qid.type, qid.version, qid.path); | |
5268cecc | 3559 | out: |
bccacf6c | 3560 | put_fid(pdu, fidp); |
84dfb926 | 3561 | out_nofid: |
dc295f83 | 3562 | pdu_complete(pdu, err); |
1b733fed | 3563 | v9fs_string_free(&name); |
5268cecc MK |
3564 | } |
3565 | ||
82cc3ee8 MK |
3566 | /* |
3567 | * Implement posix byte range locking code | |
3568 | * Server side handling of locking code is very simple, because 9p server in | |
3569 | * QEMU can handle only one client. And most of the lock handling | |
3570 | * (like conflict, merging) etc is done by the VFS layer itself, so no need to | |
3571 | * do any thing in * qemu 9p server side lock code path. | |
3572 | * So when a TLOCK request comes, always return success | |
3573 | */ | |
8440e22e | 3574 | static void coroutine_fn v9fs_lock(void *opaque) |
82cc3ee8 | 3575 | { |
ddca7f86 | 3576 | V9fsFlock flock; |
0c27bf2a AK |
3577 | size_t offset = 7; |
3578 | struct stat stbuf; | |
3579 | V9fsFidState *fidp; | |
3580 | int32_t fid, err = 0; | |
ff06030f | 3581 | V9fsPDU *pdu = opaque; |
82cc3ee8 | 3582 | |
ddca7f86 MK |
3583 | v9fs_string_init(&flock.client_id); |
3584 | err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, | |
3585 | &flock.flags, &flock.start, &flock.length, | |
3586 | &flock.proc_id, &flock.client_id); | |
3587 | if (err < 0) { | |
3588 | goto out_nofid; | |
3589 | } | |
c572f23a | 3590 | trace_v9fs_lock(pdu->tag, pdu->id, fid, |
ddca7f86 | 3591 | flock.type, flock.start, flock.length); |
c572f23a | 3592 | |
82cc3ee8 MK |
3593 | |
3594 | /* We support only block flag now (that too ignored currently) */ | |
ddca7f86 | 3595 | if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { |
82cc3ee8 | 3596 | err = -EINVAL; |
84dfb926 | 3597 | goto out_nofid; |
82cc3ee8 | 3598 | } |
bccacf6c | 3599 | fidp = get_fid(pdu, fid); |
0c27bf2a | 3600 | if (fidp == NULL) { |
82cc3ee8 | 3601 | err = -ENOENT; |
84dfb926 | 3602 | goto out_nofid; |
82cc3ee8 | 3603 | } |
cc720ddb | 3604 | err = v9fs_co_fstat(pdu, fidp, &stbuf); |
82cc3ee8 | 3605 | if (err < 0) { |
82cc3ee8 MK |
3606 | goto out; |
3607 | } | |
4bae2b39 PB |
3608 | err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); |
3609 | if (err < 0) { | |
3610 | goto out; | |
3611 | } | |
3612 | err += offset; | |
3613 | trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); | |
82cc3ee8 | 3614 | out: |
bccacf6c | 3615 | put_fid(pdu, fidp); |
84dfb926 | 3616 | out_nofid: |
dc295f83 | 3617 | pdu_complete(pdu, err); |
ddca7f86 | 3618 | v9fs_string_free(&flock.client_id); |
82cc3ee8 MK |
3619 | } |
3620 | ||
8f354003 MK |
3621 | /* |
3622 | * When a TGETLOCK request comes, always return success because all lock | |
3623 | * handling is done by client's VFS layer. | |
3624 | */ | |
8440e22e | 3625 | static void coroutine_fn v9fs_getlock(void *opaque) |
8f354003 | 3626 | { |
e4e414a4 AK |
3627 | size_t offset = 7; |
3628 | struct stat stbuf; | |
3629 | V9fsFidState *fidp; | |
ddca7f86 | 3630 | V9fsGetlock glock; |
e4e414a4 | 3631 | int32_t fid, err = 0; |
ff06030f | 3632 | V9fsPDU *pdu = opaque; |
8f354003 | 3633 | |
ddca7f86 MK |
3634 | v9fs_string_init(&glock.client_id); |
3635 | err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, | |
3636 | &glock.start, &glock.length, &glock.proc_id, | |
3637 | &glock.client_id); | |
3638 | if (err < 0) { | |
3639 | goto out_nofid; | |
3640 | } | |
c572f23a | 3641 | trace_v9fs_getlock(pdu->tag, pdu->id, fid, |
ddca7f86 | 3642 | glock.type, glock.start, glock.length); |
c572f23a | 3643 | |
bccacf6c | 3644 | fidp = get_fid(pdu, fid); |
e4e414a4 | 3645 | if (fidp == NULL) { |
8f354003 | 3646 | err = -ENOENT; |
84dfb926 | 3647 | goto out_nofid; |
8f354003 | 3648 | } |
cc720ddb | 3649 | err = v9fs_co_fstat(pdu, fidp, &stbuf); |
8f354003 | 3650 | if (err < 0) { |
8f354003 MK |
3651 | goto out; |
3652 | } | |
ddca7f86 MK |
3653 | glock.type = P9_LOCK_TYPE_UNLCK; |
3654 | err = pdu_marshal(pdu, offset, "bqqds", glock.type, | |
3655 | glock.start, glock.length, glock.proc_id, | |
3656 | &glock.client_id); | |
3657 | if (err < 0) { | |
3658 | goto out; | |
3659 | } | |
3660 | err += offset; | |
3661 | trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, | |
3662 | glock.length, glock.proc_id); | |
8f354003 | 3663 | out: |
bccacf6c | 3664 | put_fid(pdu, fidp); |
84dfb926 | 3665 | out_nofid: |
dc295f83 | 3666 | pdu_complete(pdu, err); |
ddca7f86 | 3667 | v9fs_string_free(&glock.client_id); |
8f354003 MK |
3668 | } |
3669 | ||
8440e22e | 3670 | static void coroutine_fn v9fs_mkdir(void *opaque) |
b67592ea | 3671 | { |
ff06030f | 3672 | V9fsPDU *pdu = opaque; |
e84861f7 | 3673 | size_t offset = 7; |
b67592ea | 3674 | int32_t fid; |
e84861f7 | 3675 | struct stat stbuf; |
e84861f7 | 3676 | V9fsQID qid; |
02cb7f3a | 3677 | V9fsString name; |
b67592ea MK |
3678 | V9fsFidState *fidp; |
3679 | gid_t gid; | |
3680 | int mode; | |
e84861f7 | 3681 | int err = 0; |
b67592ea | 3682 | |
ddca7f86 MK |
3683 | v9fs_string_init(&name); |
3684 | err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); | |
3685 | if (err < 0) { | |
3686 | goto out_nofid; | |
3687 | } | |
c572f23a HPB |
3688 | trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); |
3689 | ||
fff39a7a GK |
3690 | if (name_is_illegal(name.data)) { |
3691 | err = -ENOENT; | |
3692 | goto out_nofid; | |
3693 | } | |
3694 | ||
805b5d98 GK |
3695 | if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
3696 | err = -EEXIST; | |
3697 | goto out_nofid; | |
3698 | } | |
3699 | ||
bccacf6c | 3700 | fidp = get_fid(pdu, fid); |
b67592ea MK |
3701 | if (fidp == NULL) { |
3702 | err = -ENOENT; | |
84dfb926 | 3703 | goto out_nofid; |
b67592ea | 3704 | } |
bccacf6c | 3705 | err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); |
e84861f7 VJ |
3706 | if (err < 0) { |
3707 | goto out; | |
3708 | } | |
3b5ee9e8 AM |
3709 | err = stat_to_qid(pdu, &stbuf, &qid); |
3710 | if (err < 0) { | |
3711 | goto out; | |
3712 | } | |
ddca7f86 MK |
3713 | err = pdu_marshal(pdu, offset, "Q", &qid); |
3714 | if (err < 0) { | |
3715 | goto out; | |
3716 | } | |
3717 | err += offset; | |
7999f7e1 AK |
3718 | trace_v9fs_mkdir_return(pdu->tag, pdu->id, |
3719 | qid.type, qid.version, qid.path, err); | |
b67592ea | 3720 | out: |
bccacf6c | 3721 | put_fid(pdu, fidp); |
84dfb926 | 3722 | out_nofid: |
dc295f83 | 3723 | pdu_complete(pdu, err); |
e84861f7 | 3724 | v9fs_string_free(&name); |
b67592ea MK |
3725 | } |
3726 | ||
8440e22e | 3727 | static void coroutine_fn v9fs_xattrwalk(void *opaque) |
fa32ef88 | 3728 | { |
670185a6 AK |
3729 | int64_t size; |
3730 | V9fsString name; | |
fa32ef88 | 3731 | ssize_t err = 0; |
670185a6 | 3732 | size_t offset = 7; |
fa32ef88 | 3733 | int32_t fid, newfid; |
670185a6 | 3734 | V9fsFidState *file_fidp; |
84dfb926 | 3735 | V9fsFidState *xattr_fidp = NULL; |
670185a6 AK |
3736 | V9fsPDU *pdu = opaque; |
3737 | V9fsState *s = pdu->s; | |
fa32ef88 | 3738 | |
ddca7f86 MK |
3739 | v9fs_string_init(&name); |
3740 | err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); | |
3741 | if (err < 0) { | |
3742 | goto out_nofid; | |
3743 | } | |
c572f23a HPB |
3744 | trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); |
3745 | ||
bccacf6c | 3746 | file_fidp = get_fid(pdu, fid); |
670185a6 | 3747 | if (file_fidp == NULL) { |
fa32ef88 | 3748 | err = -ENOENT; |
84dfb926 | 3749 | goto out_nofid; |
fa32ef88 | 3750 | } |
670185a6 AK |
3751 | xattr_fidp = alloc_fid(s, newfid); |
3752 | if (xattr_fidp == NULL) { | |
fa32ef88 AK |
3753 | err = -EINVAL; |
3754 | goto out; | |
3755 | } | |
2289be19 | 3756 | v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); |
ba42ebb8 | 3757 | if (!v9fs_string_size(&name)) { |
fa32ef88 AK |
3758 | /* |
3759 | * listxattr request. Get the size first | |
3760 | */ | |
bccacf6c | 3761 | size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); |
670185a6 AK |
3762 | if (size < 0) { |
3763 | err = size; | |
84dfb926 | 3764 | clunk_fid(s, xattr_fidp->fid); |
670185a6 | 3765 | goto out; |
fa32ef88 | 3766 | } |
670185a6 AK |
3767 | /* |
3768 | * Read the xattr value | |
3769 | */ | |
3770 | xattr_fidp->fs.xattr.len = size; | |
3771 | xattr_fidp->fid_type = P9_FID_XATTR; | |
dd28fbbc | 3772 | xattr_fidp->fs.xattr.xattrwalk_fid = true; |
a647502c | 3773 | xattr_fidp->fs.xattr.value = g_malloc0(size); |
670185a6 | 3774 | if (size) { |
bccacf6c | 3775 | err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, |
670185a6 AK |
3776 | xattr_fidp->fs.xattr.value, |
3777 | xattr_fidp->fs.xattr.len); | |
3778 | if (err < 0) { | |
84dfb926 | 3779 | clunk_fid(s, xattr_fidp->fid); |
670185a6 AK |
3780 | goto out; |
3781 | } | |
3782 | } | |
ddca7f86 MK |
3783 | err = pdu_marshal(pdu, offset, "q", size); |
3784 | if (err < 0) { | |
3785 | goto out; | |
3786 | } | |
3787 | err += offset; | |
fa32ef88 AK |
3788 | } else { |
3789 | /* | |
3790 | * specific xattr fid. We check for xattr | |
3791 | * presence also collect the xattr size | |
3792 | */ | |
bccacf6c | 3793 | size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, |
670185a6 AK |
3794 | &name, NULL, 0); |
3795 | if (size < 0) { | |
3796 | err = size; | |
84dfb926 | 3797 | clunk_fid(s, xattr_fidp->fid); |
670185a6 | 3798 | goto out; |
fa32ef88 | 3799 | } |
670185a6 AK |
3800 | /* |
3801 | * Read the xattr value | |
3802 | */ | |
3803 | xattr_fidp->fs.xattr.len = size; | |
3804 | xattr_fidp->fid_type = P9_FID_XATTR; | |
dd28fbbc | 3805 | xattr_fidp->fs.xattr.xattrwalk_fid = true; |
a647502c | 3806 | xattr_fidp->fs.xattr.value = g_malloc0(size); |
670185a6 | 3807 | if (size) { |
bccacf6c | 3808 | err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, |
670185a6 AK |
3809 | &name, xattr_fidp->fs.xattr.value, |
3810 | xattr_fidp->fs.xattr.len); | |
3811 | if (err < 0) { | |
84dfb926 | 3812 | clunk_fid(s, xattr_fidp->fid); |
670185a6 AK |
3813 | goto out; |
3814 | } | |
3815 | } | |
ddca7f86 MK |
3816 | err = pdu_marshal(pdu, offset, "q", size); |
3817 | if (err < 0) { | |
3818 | goto out; | |
3819 | } | |
3820 | err += offset; | |
fa32ef88 | 3821 | } |
7999f7e1 | 3822 | trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); |
fa32ef88 | 3823 | out: |
bccacf6c | 3824 | put_fid(pdu, file_fidp); |
84dfb926 | 3825 | if (xattr_fidp) { |
bccacf6c | 3826 | put_fid(pdu, xattr_fidp); |
84dfb926 AK |
3827 | } |
3828 | out_nofid: | |
dc295f83 | 3829 | pdu_complete(pdu, err); |
670185a6 | 3830 | v9fs_string_free(&name); |
fa32ef88 AK |
3831 | } |
3832 | ||
8440e22e | 3833 | static void coroutine_fn v9fs_xattrcreate(void *opaque) |
10b468bd | 3834 | { |
aca6897f | 3835 | int flags, rflags = 0; |
10b468bd | 3836 | int32_t fid; |
3b79ef2c | 3837 | uint64_t size; |
10b468bd | 3838 | ssize_t err = 0; |
f10ff58d AK |
3839 | V9fsString name; |
3840 | size_t offset = 7; | |
3841 | V9fsFidState *file_fidp; | |
3842 | V9fsFidState *xattr_fidp; | |
3843 | V9fsPDU *pdu = opaque; | |
10b468bd | 3844 | |
ddca7f86 MK |
3845 | v9fs_string_init(&name); |
3846 | err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); | |
3847 | if (err < 0) { | |
3848 | goto out_nofid; | |
3849 | } | |
c572f23a | 3850 | trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); |
10b468bd | 3851 | |
aca6897f KF |
3852 | if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { |
3853 | err = -EINVAL; | |
3854 | goto out_nofid; | |
3855 | } | |
3856 | ||
3857 | if (flags & P9_XATTR_CREATE) { | |
3858 | rflags |= XATTR_CREATE; | |
3859 | } | |
3860 | ||
3861 | if (flags & P9_XATTR_REPLACE) { | |
3862 | rflags |= XATTR_REPLACE; | |
3863 | } | |
3864 | ||
3b79ef2c GK |
3865 | if (size > XATTR_SIZE_MAX) { |
3866 | err = -E2BIG; | |
3867 | goto out_nofid; | |
3868 | } | |
3869 | ||
bccacf6c | 3870 | file_fidp = get_fid(pdu, fid); |
f10ff58d | 3871 | if (file_fidp == NULL) { |
10b468bd | 3872 | err = -EINVAL; |
84dfb926 | 3873 | goto out_nofid; |
10b468bd | 3874 | } |
dd654e03 GK |
3875 | if (file_fidp->fid_type != P9_FID_NONE) { |
3876 | err = -EINVAL; | |
3877 | goto out_put_fid; | |
3878 | } | |
3879 | ||
10b468bd | 3880 | /* Make the file fid point to xattr */ |
f10ff58d AK |
3881 | xattr_fidp = file_fidp; |
3882 | xattr_fidp->fid_type = P9_FID_XATTR; | |
3883 | xattr_fidp->fs.xattr.copied_len = 0; | |
dd28fbbc | 3884 | xattr_fidp->fs.xattr.xattrwalk_fid = false; |
f10ff58d | 3885 | xattr_fidp->fs.xattr.len = size; |
aca6897f | 3886 | xattr_fidp->fs.xattr.flags = rflags; |
f10ff58d AK |
3887 | v9fs_string_init(&xattr_fidp->fs.xattr.name); |
3888 | v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); | |
eb687602 | 3889 | xattr_fidp->fs.xattr.value = g_malloc0(size); |
f10ff58d | 3890 | err = offset; |
dd654e03 | 3891 | out_put_fid: |
bccacf6c | 3892 | put_fid(pdu, file_fidp); |
84dfb926 | 3893 | out_nofid: |
dc295f83 | 3894 | pdu_complete(pdu, err); |
f10ff58d | 3895 | v9fs_string_free(&name); |
10b468bd | 3896 | } |
fa32ef88 | 3897 | |
8440e22e | 3898 | static void coroutine_fn v9fs_readlink(void *opaque) |
df0973a4 | 3899 | { |
ff06030f | 3900 | V9fsPDU *pdu = opaque; |
7a5ca31e VJ |
3901 | size_t offset = 7; |
3902 | V9fsString target; | |
df0973a4 | 3903 | int32_t fid; |
df0973a4 MK |
3904 | int err = 0; |
3905 | V9fsFidState *fidp; | |
3906 | ||
ddca7f86 MK |
3907 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
3908 | if (err < 0) { | |
3909 | goto out_nofid; | |
3910 | } | |
c572f23a | 3911 | trace_v9fs_readlink(pdu->tag, pdu->id, fid); |
bccacf6c | 3912 | fidp = get_fid(pdu, fid); |
df0973a4 MK |
3913 | if (fidp == NULL) { |
3914 | err = -ENOENT; | |
84dfb926 | 3915 | goto out_nofid; |
df0973a4 MK |
3916 | } |
3917 | ||
7a5ca31e | 3918 | v9fs_string_init(&target); |
bccacf6c | 3919 | err = v9fs_co_readlink(pdu, &fidp->path, &target); |
7a5ca31e VJ |
3920 | if (err < 0) { |
3921 | goto out; | |
3922 | } | |
ddca7f86 MK |
3923 | err = pdu_marshal(pdu, offset, "s", &target); |
3924 | if (err < 0) { | |
3925 | v9fs_string_free(&target); | |
3926 | goto out; | |
3927 | } | |
3928 | err += offset; | |
7999f7e1 | 3929 | trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); |
7a5ca31e | 3930 | v9fs_string_free(&target); |
df0973a4 | 3931 | out: |
bccacf6c | 3932 | put_fid(pdu, fidp); |
84dfb926 | 3933 | out_nofid: |
dc295f83 | 3934 | pdu_complete(pdu, err); |
df0973a4 MK |
3935 | } |
3936 | ||
ff06030f | 3937 | static CoroutineEntry *pdu_co_handlers[] = { |
c18e2f94 | 3938 | [P9_TREADDIR] = v9fs_readdir, |
be940c87 | 3939 | [P9_TSTATFS] = v9fs_statfs, |
00ede4c2 | 3940 | [P9_TGETATTR] = v9fs_getattr, |
c79ce737 | 3941 | [P9_TSETATTR] = v9fs_setattr, |
fa32ef88 | 3942 | [P9_TXATTRWALK] = v9fs_xattrwalk, |
10b468bd | 3943 | [P9_TXATTRCREATE] = v9fs_xattrcreate, |
5268cecc | 3944 | [P9_TMKNOD] = v9fs_mknod, |
c7b4b0b3 | 3945 | [P9_TRENAME] = v9fs_rename, |
82cc3ee8 | 3946 | [P9_TLOCK] = v9fs_lock, |
8f354003 | 3947 | [P9_TGETLOCK] = v9fs_getlock, |
89bf6593 | 3948 | [P9_TRENAMEAT] = v9fs_renameat, |
df0973a4 | 3949 | [P9_TREADLINK] = v9fs_readlink, |
7834cf77 | 3950 | [P9_TUNLINKAT] = v9fs_unlinkat, |
b67592ea | 3951 | [P9_TMKDIR] = v9fs_mkdir, |
9f107513 | 3952 | [P9_TVERSION] = v9fs_version, |
771e9d4c | 3953 | [P9_TLOPEN] = v9fs_open, |
9f107513 AL |
3954 | [P9_TATTACH] = v9fs_attach, |
3955 | [P9_TSTAT] = v9fs_stat, | |
3956 | [P9_TWALK] = v9fs_walk, | |
3957 | [P9_TCLUNK] = v9fs_clunk, | |
b41e95d3 | 3958 | [P9_TFSYNC] = v9fs_fsync, |
9f107513 AL |
3959 | [P9_TOPEN] = v9fs_open, |
3960 | [P9_TREAD] = v9fs_read, | |
3961 | #if 0 | |
3962 | [P9_TAUTH] = v9fs_auth, | |
3963 | #endif | |
3964 | [P9_TFLUSH] = v9fs_flush, | |
b2c224be | 3965 | [P9_TLINK] = v9fs_link, |
08c60fc9 | 3966 | [P9_TSYMLINK] = v9fs_symlink, |
9f107513 | 3967 | [P9_TCREATE] = v9fs_create, |
c1568af5 | 3968 | [P9_TLCREATE] = v9fs_lcreate, |
9f107513 AL |
3969 | [P9_TWRITE] = v9fs_write, |
3970 | [P9_TWSTAT] = v9fs_wstat, | |
3971 | [P9_TREMOVE] = v9fs_remove, | |
3972 | }; | |
3973 | ||
8440e22e | 3974 | static void coroutine_fn v9fs_op_not_supp(void *opaque) |
5c3234c6 | 3975 | { |
ff06030f | 3976 | V9fsPDU *pdu = opaque; |
dc295f83 | 3977 | pdu_complete(pdu, -EOPNOTSUPP); |
5c3234c6 AK |
3978 | } |
3979 | ||
8440e22e | 3980 | static void coroutine_fn v9fs_fs_ro(void *opaque) |
2c74c2cb MK |
3981 | { |
3982 | V9fsPDU *pdu = opaque; | |
dc295f83 | 3983 | pdu_complete(pdu, -EROFS); |
2c74c2cb MK |
3984 | } |
3985 | ||
3986 | static inline bool is_read_only_op(V9fsPDU *pdu) | |
3987 | { | |
3988 | switch (pdu->id) { | |
3989 | case P9_TREADDIR: | |
3990 | case P9_TSTATFS: | |
3991 | case P9_TGETATTR: | |
3992 | case P9_TXATTRWALK: | |
3993 | case P9_TLOCK: | |
3994 | case P9_TGETLOCK: | |
3995 | case P9_TREADLINK: | |
3996 | case P9_TVERSION: | |
3997 | case P9_TLOPEN: | |
3998 | case P9_TATTACH: | |
3999 | case P9_TSTAT: | |
4000 | case P9_TWALK: | |
4001 | case P9_TCLUNK: | |
4002 | case P9_TFSYNC: | |
4003 | case P9_TOPEN: | |
4004 | case P9_TREAD: | |
4005 | case P9_TAUTH: | |
4006 | case P9_TFLUSH: | |
4007 | return 1; | |
4008 | default: | |
4009 | return 0; | |
4010 | } | |
4011 | } | |
4012 | ||
506f3275 | 4013 | void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) |
9f107513 | 4014 | { |
ff06030f VJ |
4015 | Coroutine *co; |
4016 | CoroutineEntry *handler; | |
ad38ce9e | 4017 | V9fsState *s = pdu->s; |
9f107513 | 4018 | |
506f3275 GK |
4019 | pdu->size = le32_to_cpu(hdr->size_le); |
4020 | pdu->id = hdr->id; | |
4021 | pdu->tag = le16_to_cpu(hdr->tag_le); | |
4022 | ||
ff06030f VJ |
4023 | if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || |
4024 | (pdu_co_handlers[pdu->id] == NULL)) { | |
5c3234c6 | 4025 | handler = v9fs_op_not_supp; |
d1471233 GK |
4026 | } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { |
4027 | handler = v9fs_fs_ro; | |
5c3234c6 | 4028 | } else { |
ff06030f | 4029 | handler = pdu_co_handlers[pdu->id]; |
5c3234c6 | 4030 | } |
2c74c2cb | 4031 | |
506f3275 | 4032 | qemu_co_queue_init(&pdu->complete); |
0b8b8753 PB |
4033 | co = qemu_coroutine_create(handler, pdu); |
4034 | qemu_coroutine_enter(co); | |
9f107513 AL |
4035 | } |
4036 | ||
2a0c56aa | 4037 | /* Returns 0 on success, 1 on failure. */ |
066eb006 GK |
4038 | int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, |
4039 | Error **errp) | |
2a0c56aa | 4040 | { |
92c45122 | 4041 | ERRP_GUARD(); |
2a0c56aa WL |
4042 | int i, len; |
4043 | struct stat stat; | |
4044 | FsDriverEntry *fse; | |
4045 | V9fsPath path; | |
4046 | int rc = 1; | |
4047 | ||
066eb006 GK |
4048 | assert(!s->transport); |
4049 | s->transport = t; | |
4050 | ||
2a0c56aa WL |
4051 | /* initialize pdu allocator */ |
4052 | QLIST_INIT(&s->free_list); | |
4053 | QLIST_INIT(&s->active_list); | |
0d78289c | 4054 | for (i = 0; i < MAX_REQ; i++) { |
583f21f8 SS |
4055 | QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
4056 | s->pdus[i].s = s; | |
4057 | s->pdus[i].idx = i; | |
2a0c56aa WL |
4058 | } |
4059 | ||
4060 | v9fs_path_init(&path); | |
4061 | ||
4062 | fse = get_fsdev_fsentry(s->fsconf.fsdev_id); | |
4063 | ||
4064 | if (!fse) { | |
4065 | /* We don't have a fsdev identified by fsdev_id */ | |
4066 | error_setg(errp, "9pfs device couldn't find fsdev with the " | |
4067 | "id = %s", | |
4068 | s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); | |
4069 | goto out; | |
4070 | } | |
4071 | ||
4072 | if (!s->fsconf.tag) { | |
4073 | /* we haven't specified a mount_tag */ | |
4074 | error_setg(errp, "fsdev with id %s needs mount_tag arguments", | |
4075 | s->fsconf.fsdev_id); | |
4076 | goto out; | |
4077 | } | |
4078 | ||
4079 | s->ctx.export_flags = fse->export_flags; | |
4080 | s->ctx.fs_root = g_strdup(fse->path); | |
4081 | s->ctx.exops.get_st_gen = NULL; | |
4082 | len = strlen(s->fsconf.tag); | |
4083 | if (len > MAX_TAG_LEN - 1) { | |
4084 | error_setg(errp, "mount tag '%s' (%d bytes) is longer than " | |
4085 | "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); | |
4086 | goto out; | |
4087 | } | |
4088 | ||
4089 | s->tag = g_strdup(s->fsconf.tag); | |
4090 | s->ctx.uid = -1; | |
4091 | ||
4092 | s->ops = fse->ops; | |
4093 | ||
b96feb2c TS |
4094 | s->ctx.fmode = fse->fmode; |
4095 | s->ctx.dmode = fse->dmode; | |
4096 | ||
feabd6cf | 4097 | QSIMPLEQ_INIT(&s->fid_list); |
2a0c56aa WL |
4098 | qemu_co_rwlock_init(&s->rename_lock); |
4099 | ||
65603a80 GK |
4100 | if (s->ops->init(&s->ctx, errp) < 0) { |
4101 | error_prepend(errp, "cannot initialize fsdev '%s': ", | |
4102 | s->fsconf.fsdev_id); | |
2a0c56aa WL |
4103 | goto out; |
4104 | } | |
4105 | ||
4106 | /* | |
4107 | * Check details of export path, We need to use fs driver | |
4108 | * call back to do that. Since we are in the init path, we don't | |
4109 | * use co-routines here. | |
4110 | */ | |
4111 | if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { | |
4112 | error_setg(errp, | |
4113 | "error in converting name to path %s", strerror(errno)); | |
4114 | goto out; | |
4115 | } | |
4116 | if (s->ops->lstat(&s->ctx, &path, &stat)) { | |
4117 | error_setg(errp, "share path %s does not exist", fse->path); | |
4118 | goto out; | |
4119 | } else if (!S_ISDIR(stat.st_mode)) { | |
4120 | error_setg(errp, "share path %s is not a directory", fse->path); | |
4121 | goto out; | |
4122 | } | |
b8bbdb88 | 4123 | |
3b5ee9e8 AM |
4124 | s->dev_id = stat.st_dev; |
4125 | ||
6b6aa828 CS |
4126 | /* init inode remapping : */ |
4127 | /* hash table for variable length inode suffixes */ | |
4128 | qpd_table_init(&s->qpd_table); | |
4129 | /* hash table for slow/full inode remapping (most users won't need it) */ | |
4130 | qpf_table_init(&s->qpf_table); | |
4131 | /* hash table for quick inode remapping */ | |
1a6ed33c | 4132 | qpp_table_init(&s->qpp_table); |
6b6aa828 CS |
4133 | s->qp_ndevices = 0; |
4134 | s->qp_affix_next = 1; /* reserve 0 to detect overflow */ | |
f3fe4a2d | 4135 | s->qp_fullpath_next = 1; |
1a6ed33c | 4136 | |
b8bbdb88 PJ |
4137 | s->ctx.fst = &fse->fst; |
4138 | fsdev_throttle_init(s->ctx.fst); | |
4139 | ||
2a0c56aa WL |
4140 | rc = 0; |
4141 | out: | |
4142 | if (rc) { | |
b69c3c21 | 4143 | v9fs_device_unrealize_common(s); |
2a0c56aa | 4144 | } |
c0da0cb7 | 4145 | v9fs_path_free(&path); |
2a0c56aa WL |
4146 | return rc; |
4147 | } | |
4148 | ||
b69c3c21 | 4149 | void v9fs_device_unrealize_common(V9fsState *s) |
2a0c56aa | 4150 | { |
c0da0cb7 | 4151 | if (s->ops && s->ops->cleanup) { |
702dbcc2 LQ |
4152 | s->ops->cleanup(&s->ctx); |
4153 | } | |
c0da0cb7 GK |
4154 | if (s->ctx.fst) { |
4155 | fsdev_throttle_cleanup(s->ctx.fst); | |
4156 | } | |
2a0c56aa | 4157 | g_free(s->tag); |
6b6aa828 | 4158 | qp_table_destroy(&s->qpd_table); |
f3fe4a2d AM |
4159 | qp_table_destroy(&s->qpp_table); |
4160 | qp_table_destroy(&s->qpf_table); | |
4774718e | 4161 | g_free(s->ctx.fs_root); |
2a0c56aa WL |
4162 | } |
4163 | ||
0e44a0fd GK |
4164 | typedef struct VirtfsCoResetData { |
4165 | V9fsPDU pdu; | |
4166 | bool done; | |
4167 | } VirtfsCoResetData; | |
4168 | ||
4169 | static void coroutine_fn virtfs_co_reset(void *opaque) | |
4170 | { | |
4171 | VirtfsCoResetData *data = opaque; | |
4172 | ||
4173 | virtfs_reset(&data->pdu); | |
4174 | data->done = true; | |
4175 | } | |
4176 | ||
4177 | void v9fs_reset(V9fsState *s) | |
4178 | { | |
4179 | VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; | |
4180 | Coroutine *co; | |
4181 | ||
4182 | while (!QLIST_EMPTY(&s->active_list)) { | |
4183 | aio_poll(qemu_get_aio_context(), true); | |
4184 | } | |
4185 | ||
4186 | co = qemu_coroutine_create(virtfs_co_reset, &data); | |
4187 | qemu_coroutine_enter(co); | |
4188 | ||
4189 | while (!data.done) { | |
4190 | aio_poll(qemu_get_aio_context(), true); | |
4191 | } | |
4192 | } | |
4193 | ||
72a18977 | 4194 | static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) |
7a462745 AK |
4195 | { |
4196 | struct rlimit rlim; | |
4197 | if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { | |
63325b18 | 4198 | error_report("Failed to get the resource limit"); |
7a462745 AK |
4199 | exit(1); |
4200 | } | |
01011733 XZ |
4201 | open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); |
4202 | open_fd_rc = rlim.rlim_cur / 2; | |
7a462745 | 4203 | } |