| 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 | |
| 14 | /* |
| 15 | * Not so fast! You might want to read the 9p developer docs first: |
| 16 | * https://wiki.qemu.org/Documentation/9p |
| 17 | */ |
| 18 | |
| 19 | #include "qemu/osdep.h" |
| 20 | #ifdef CONFIG_LINUX |
| 21 | #include <linux/limits.h> |
| 22 | #endif |
| 23 | #include <glib/gprintf.h> |
| 24 | #include "hw/virtio/virtio.h" |
| 25 | #include "qapi/error.h" |
| 26 | #include "qemu/error-report.h" |
| 27 | #include "qemu/iov.h" |
| 28 | #include "qemu/main-loop.h" |
| 29 | #include "qemu/sockets.h" |
| 30 | #include "virtio-9p.h" |
| 31 | #include "fsdev/qemu-fsdev.h" |
| 32 | #include "9p-xattr.h" |
| 33 | #include "9p-util.h" |
| 34 | #include "coth.h" |
| 35 | #include "trace.h" |
| 36 | #include "migration/blocker.h" |
| 37 | #include "qemu/xxhash.h" |
| 38 | #include <math.h> |
| 39 | |
| 40 | int open_fd_hw; |
| 41 | int total_open_fd; |
| 42 | static int open_fd_rc; |
| 43 | |
| 44 | enum { |
| 45 | Oread = 0x00, |
| 46 | Owrite = 0x01, |
| 47 | Ordwr = 0x02, |
| 48 | Oexec = 0x03, |
| 49 | Oexcl = 0x04, |
| 50 | Otrunc = 0x10, |
| 51 | Orexec = 0x20, |
| 52 | Orclose = 0x40, |
| 53 | Oappend = 0x80, |
| 54 | }; |
| 55 | |
| 56 | P9ARRAY_DEFINE_TYPE(V9fsPath, v9fs_path_free); |
| 57 | |
| 58 | static ssize_t coroutine_fn |
| 59 | pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
| 60 | { |
| 61 | ssize_t ret; |
| 62 | va_list ap; |
| 63 | |
| 64 | va_start(ap, fmt); |
| 65 | ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); |
| 66 | va_end(ap); |
| 67 | |
| 68 | return ret; |
| 69 | } |
| 70 | |
| 71 | static ssize_t coroutine_fn |
| 72 | pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
| 73 | { |
| 74 | ssize_t ret; |
| 75 | va_list ap; |
| 76 | |
| 77 | va_start(ap, fmt); |
| 78 | ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); |
| 79 | va_end(ap); |
| 80 | |
| 81 | return ret; |
| 82 | } |
| 83 | |
| 84 | static int omode_to_uflags(int8_t mode) |
| 85 | { |
| 86 | int ret = 0; |
| 87 | |
| 88 | switch (mode & 3) { |
| 89 | case Oread: |
| 90 | ret = O_RDONLY; |
| 91 | break; |
| 92 | case Ordwr: |
| 93 | ret = O_RDWR; |
| 94 | break; |
| 95 | case Owrite: |
| 96 | ret = O_WRONLY; |
| 97 | break; |
| 98 | case Oexec: |
| 99 | ret = O_RDONLY; |
| 100 | break; |
| 101 | } |
| 102 | |
| 103 | if (mode & Otrunc) { |
| 104 | ret |= O_TRUNC; |
| 105 | } |
| 106 | |
| 107 | if (mode & Oappend) { |
| 108 | ret |= O_APPEND; |
| 109 | } |
| 110 | |
| 111 | if (mode & Oexcl) { |
| 112 | ret |= O_EXCL; |
| 113 | } |
| 114 | |
| 115 | return ret; |
| 116 | } |
| 117 | |
| 118 | typedef struct DotlOpenflagMap { |
| 119 | int dotl_flag; |
| 120 | int open_flag; |
| 121 | } DotlOpenflagMap; |
| 122 | |
| 123 | static int dotl_to_open_flags(int flags) |
| 124 | { |
| 125 | int i; |
| 126 | /* |
| 127 | * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY |
| 128 | * and P9_DOTL_NOACCESS |
| 129 | */ |
| 130 | int oflags = flags & O_ACCMODE; |
| 131 | |
| 132 | DotlOpenflagMap dotl_oflag_map[] = { |
| 133 | { P9_DOTL_CREATE, O_CREAT }, |
| 134 | { P9_DOTL_EXCL, O_EXCL }, |
| 135 | { P9_DOTL_NOCTTY , O_NOCTTY }, |
| 136 | { P9_DOTL_TRUNC, O_TRUNC }, |
| 137 | { P9_DOTL_APPEND, O_APPEND }, |
| 138 | { P9_DOTL_NONBLOCK, O_NONBLOCK } , |
| 139 | { P9_DOTL_DSYNC, O_DSYNC }, |
| 140 | { P9_DOTL_FASYNC, FASYNC }, |
| 141 | #if !defined(CONFIG_DARWIN) && !defined(CONFIG_FREEBSD) |
| 142 | { P9_DOTL_NOATIME, O_NOATIME }, |
| 143 | #endif |
| 144 | #ifndef CONFIG_DARWIN |
| 145 | /* |
| 146 | * On Darwin, we could map to F_NOCACHE, which is |
| 147 | * similar, but doesn't quite have the same |
| 148 | * semantics. However, we don't support O_DIRECT |
| 149 | * even on linux at the moment, so we just ignore |
| 150 | * it here. |
| 151 | */ |
| 152 | { P9_DOTL_DIRECT, O_DIRECT }, |
| 153 | #endif |
| 154 | { P9_DOTL_LARGEFILE, O_LARGEFILE }, |
| 155 | { P9_DOTL_DIRECTORY, O_DIRECTORY }, |
| 156 | { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, |
| 157 | { P9_DOTL_SYNC, O_SYNC }, |
| 158 | }; |
| 159 | |
| 160 | for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { |
| 161 | if (flags & dotl_oflag_map[i].dotl_flag) { |
| 162 | oflags |= dotl_oflag_map[i].open_flag; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | return oflags; |
| 167 | } |
| 168 | |
| 169 | void cred_init(FsCred *credp) |
| 170 | { |
| 171 | credp->fc_uid = -1; |
| 172 | credp->fc_gid = -1; |
| 173 | credp->fc_mode = -1; |
| 174 | credp->fc_rdev = -1; |
| 175 | } |
| 176 | |
| 177 | static int get_dotl_openflags(V9fsState *s, int oflags) |
| 178 | { |
| 179 | int flags; |
| 180 | /* |
| 181 | * Filter the client open flags |
| 182 | */ |
| 183 | flags = dotl_to_open_flags(oflags); |
| 184 | flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); |
| 185 | #ifndef CONFIG_DARWIN |
| 186 | /* |
| 187 | * Ignore direct disk access hint until the server supports it. |
| 188 | */ |
| 189 | flags &= ~O_DIRECT; |
| 190 | #endif |
| 191 | return flags; |
| 192 | } |
| 193 | |
| 194 | void v9fs_path_init(V9fsPath *path) |
| 195 | { |
| 196 | path->data = NULL; |
| 197 | path->size = 0; |
| 198 | } |
| 199 | |
| 200 | void v9fs_path_free(V9fsPath *path) |
| 201 | { |
| 202 | g_free(path->data); |
| 203 | path->data = NULL; |
| 204 | path->size = 0; |
| 205 | } |
| 206 | |
| 207 | |
| 208 | int v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) |
| 209 | { |
| 210 | va_list ap; |
| 211 | int ret; |
| 212 | |
| 213 | v9fs_path_free(path); |
| 214 | |
| 215 | va_start(ap, fmt); |
| 216 | ret = g_vasprintf(&path->data, fmt, ap); |
| 217 | va_end(ap); |
| 218 | if (ret < 0) { |
| 219 | error_report_once("9pfs: unusual path formatting failure; " |
| 220 | "invalidating associated FID"); |
| 221 | return -1; |
| 222 | } |
| 223 | /* Bump the size for including terminating NULL */ |
| 224 | path->size = ret + 1; |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) |
| 229 | { |
| 230 | v9fs_path_free(dst); |
| 231 | dst->size = src->size; |
| 232 | dst->data = g_memdup(src->data, src->size); |
| 233 | } |
| 234 | |
| 235 | int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, |
| 236 | const char *name, V9fsPath *path) |
| 237 | { |
| 238 | int err; |
| 239 | err = s->ops->name_to_path(&s->ctx, dirpath, name, path); |
| 240 | if (err < 0) { |
| 241 | err = -errno; |
| 242 | } |
| 243 | return err; |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * Return TRUE if s1 is an ancestor of s2. |
| 248 | * |
| 249 | * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". |
| 250 | * As a special case, We treat s1 as ancestor of s2 if they are same! |
| 251 | */ |
| 252 | static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) |
| 253 | { |
| 254 | if (!s1->data || !s2->data) { |
| 255 | return 0; |
| 256 | } |
| 257 | if (!strncmp(s1->data, s2->data, s1->size - 1)) { |
| 258 | if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { |
| 259 | return 1; |
| 260 | } |
| 261 | } |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | static size_t v9fs_string_size(V9fsString *str) |
| 266 | { |
| 267 | return str->size; |
| 268 | } |
| 269 | |
| 270 | static int xattr_fid_count_inc(V9fsPDU *pdu) |
| 271 | { |
| 272 | V9fsState *s = pdu->s; |
| 273 | |
| 274 | if (s->ctx.xattr_fid_limit > 0 && |
| 275 | s->ctx.xattr_fid_count >= s->ctx.xattr_fid_limit) { |
| 276 | error_report_once("9pfs: xattr_fid_count limit exceeded " |
| 277 | "(configurable by option 'max_xattr')."); |
| 278 | return -ENOSPC; |
| 279 | } |
| 280 | s->ctx.xattr_fid_count++; |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | static void xattr_fid_count_decr(V9fsPDU *pdu) |
| 285 | { |
| 286 | V9fsState *s = pdu->s; |
| 287 | |
| 288 | if (s->ctx.xattr_fid_count > 0) { |
| 289 | s->ctx.xattr_fid_count--; |
| 290 | } else { |
| 291 | error_report_once("9pfs: xattr_fid_count underflow detected"); |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * returns 0 if fid got re-opened, 1 if not, < 0 on error |
| 297 | */ |
| 298 | static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) |
| 299 | { |
| 300 | int err = 1; |
| 301 | if (f->fid_type == P9_FID_FILE) { |
| 302 | if (f->fs.fd == -1) { |
| 303 | do { |
| 304 | err = v9fs_co_open(pdu, f, f->open_flags); |
| 305 | } while (err == -EINTR && !pdu->cancelled); |
| 306 | } |
| 307 | } else if (f->fid_type == P9_FID_DIR) { |
| 308 | if (f->fs.dir.stream == NULL) { |
| 309 | do { |
| 310 | err = v9fs_co_opendir(pdu, f); |
| 311 | } while (err == -EINTR && !pdu->cancelled); |
| 312 | } |
| 313 | } |
| 314 | return err; |
| 315 | } |
| 316 | |
| 317 | static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) |
| 318 | { |
| 319 | int err; |
| 320 | V9fsFidState *f; |
| 321 | V9fsState *s = pdu->s; |
| 322 | |
| 323 | f = g_hash_table_lookup(s->fids, GINT_TO_POINTER(fid)); |
| 324 | if (f) { |
| 325 | BUG_ON(f->clunked); |
| 326 | /* |
| 327 | * Update the fid ref upfront so that |
| 328 | * we don't get reclaimed when we yield |
| 329 | * in open later. |
| 330 | */ |
| 331 | f->ref++; |
| 332 | /* |
| 333 | * check whether we need to reopen the |
| 334 | * file. We might have closed the fd |
| 335 | * while trying to free up some file |
| 336 | * descriptors. |
| 337 | */ |
| 338 | err = v9fs_reopen_fid(pdu, f); |
| 339 | if (err < 0) { |
| 340 | f->ref--; |
| 341 | return NULL; |
| 342 | } |
| 343 | /* |
| 344 | * Mark the fid as referenced so that the LRU |
| 345 | * reclaim won't close the file descriptor |
| 346 | */ |
| 347 | f->flags |= FID_REFERENCED; |
| 348 | return f; |
| 349 | } |
| 350 | return NULL; |
| 351 | } |
| 352 | |
| 353 | static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) |
| 354 | { |
| 355 | V9fsFidState *f; |
| 356 | |
| 357 | f = g_hash_table_lookup(s->fids, GINT_TO_POINTER(fid)); |
| 358 | if (f) { |
| 359 | /* If fid is already there return NULL */ |
| 360 | BUG_ON(f->clunked); |
| 361 | return NULL; |
| 362 | } |
| 363 | f = g_new0(V9fsFidState, 1); |
| 364 | f->fid = fid; |
| 365 | f->fid_type = P9_FID_NONE; |
| 366 | f->ref = 1; |
| 367 | /* |
| 368 | * Mark the fid as referenced so that the LRU |
| 369 | * reclaim won't close the file descriptor |
| 370 | */ |
| 371 | f->flags |= FID_REFERENCED; |
| 372 | g_hash_table_insert(s->fids, GINT_TO_POINTER(fid), f); |
| 373 | |
| 374 | v9fs_readdir_init(s->proto_version, &f->fs.dir); |
| 375 | v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); |
| 376 | |
| 377 | return f; |
| 378 | } |
| 379 | |
| 380 | static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) |
| 381 | { |
| 382 | int retval = 0; |
| 383 | |
| 384 | if (fidp->fs.xattr.xattrwalk_fid) { |
| 385 | /* getxattr/listxattr fid */ |
| 386 | goto free_value; |
| 387 | } |
| 388 | /* |
| 389 | * if this is fid for setxattr. clunk should |
| 390 | * result in setxattr localcall |
| 391 | */ |
| 392 | if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { |
| 393 | /* clunk after partial write */ |
| 394 | retval = -EINVAL; |
| 395 | goto free_out; |
| 396 | } |
| 397 | if (fidp->fs.xattr.len) { |
| 398 | retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, |
| 399 | fidp->fs.xattr.value, |
| 400 | fidp->fs.xattr.len, |
| 401 | fidp->fs.xattr.flags); |
| 402 | } else { |
| 403 | retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); |
| 404 | } |
| 405 | free_out: |
| 406 | v9fs_string_free(&fidp->fs.xattr.name); |
| 407 | free_value: |
| 408 | g_free(fidp->fs.xattr.value); |
| 409 | return retval; |
| 410 | } |
| 411 | |
| 412 | static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) |
| 413 | { |
| 414 | int retval = 0; |
| 415 | |
| 416 | if (fidp->fid_type == P9_FID_FILE) { |
| 417 | /* If we reclaimed the fd no need to close */ |
| 418 | if (fidp->fs.fd != -1) { |
| 419 | retval = v9fs_co_close(pdu, &fidp->fs); |
| 420 | } |
| 421 | } else if (fidp->fid_type == P9_FID_DIR) { |
| 422 | if (fidp->fs.dir.stream != NULL) { |
| 423 | retval = v9fs_co_closedir(pdu, &fidp->fs); |
| 424 | } |
| 425 | } else if (fidp->fid_type == P9_FID_XATTR) { |
| 426 | retval = v9fs_xattr_fid_clunk(pdu, fidp); |
| 427 | xattr_fid_count_decr(pdu); |
| 428 | } |
| 429 | v9fs_path_free(&fidp->path); |
| 430 | g_free(fidp); |
| 431 | return retval; |
| 432 | } |
| 433 | |
| 434 | static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) |
| 435 | { |
| 436 | BUG_ON(!fidp->ref); |
| 437 | fidp->ref--; |
| 438 | /* |
| 439 | * Don't free the fid if it is in reclaim list |
| 440 | */ |
| 441 | if (!fidp->ref && fidp->clunked) { |
| 442 | if (fidp->fid == pdu->s->root_fid) { |
| 443 | /* |
| 444 | * if the clunked fid is root fid then we |
| 445 | * have unmounted the fs on the client side. |
| 446 | * delete the migration blocker. Ideally, this |
| 447 | * should be hooked to transport close notification |
| 448 | */ |
| 449 | migrate_del_blocker(&pdu->s->migration_blocker); |
| 450 | } |
| 451 | return free_fid(pdu, fidp); |
| 452 | } |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) |
| 457 | { |
| 458 | V9fsFidState *fidp; |
| 459 | |
| 460 | /* TODO: Use g_hash_table_steal_extended() instead? */ |
| 461 | fidp = g_hash_table_lookup(s->fids, GINT_TO_POINTER(fid)); |
| 462 | if (fidp) { |
| 463 | g_hash_table_remove(s->fids, GINT_TO_POINTER(fid)); |
| 464 | fidp->clunked = true; |
| 465 | return fidp; |
| 466 | } |
| 467 | return NULL; |
| 468 | } |
| 469 | |
| 470 | void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) |
| 471 | { |
| 472 | int reclaim_count = 0; |
| 473 | V9fsState *s = pdu->s; |
| 474 | V9fsFidState *f; |
| 475 | GHashTableIter iter; |
| 476 | gpointer fid; |
| 477 | int err; |
| 478 | int nclosed = 0; |
| 479 | |
| 480 | /* prevent multiple coroutines running this function simultaniously */ |
| 481 | if (s->reclaiming) { |
| 482 | return; |
| 483 | } |
| 484 | s->reclaiming = true; |
| 485 | |
| 486 | g_hash_table_iter_init(&iter, s->fids); |
| 487 | |
| 488 | QSLIST_HEAD(, V9fsFidState) reclaim_list = |
| 489 | QSLIST_HEAD_INITIALIZER(reclaim_list); |
| 490 | |
| 491 | /* Pick FIDs to be closed, collect them on reclaim_list. */ |
| 492 | while (g_hash_table_iter_next(&iter, &fid, (gpointer *) &f)) { |
| 493 | /* |
| 494 | * Unlinked fids cannot be reclaimed, skip those, and also skip fids |
| 495 | * currently being operated on. |
| 496 | */ |
| 497 | if (f->ref || f->flags & FID_NON_RECLAIMABLE) { |
| 498 | continue; |
| 499 | } |
| 500 | /* |
| 501 | * if it is a recently referenced fid |
| 502 | * we leave the fid untouched and clear the |
| 503 | * reference bit. We come back to it later |
| 504 | * in the next iteration. (a simple LRU without |
| 505 | * moving list elements around) |
| 506 | */ |
| 507 | if (f->flags & FID_REFERENCED) { |
| 508 | f->flags &= ~FID_REFERENCED; |
| 509 | continue; |
| 510 | } |
| 511 | /* |
| 512 | * Add fids to reclaim list. |
| 513 | */ |
| 514 | if (f->fid_type == P9_FID_FILE) { |
| 515 | if (f->fs.fd != -1) { |
| 516 | /* |
| 517 | * Up the reference count so that |
| 518 | * a clunk request won't free this fid |
| 519 | */ |
| 520 | f->ref++; |
| 521 | QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); |
| 522 | f->fs_reclaim.fd = f->fs.fd; |
| 523 | f->fs.fd = -1; |
| 524 | reclaim_count++; |
| 525 | } |
| 526 | } else if (f->fid_type == P9_FID_DIR) { |
| 527 | if (f->fs.dir.stream != NULL) { |
| 528 | /* |
| 529 | * Up the reference count so that |
| 530 | * a clunk request won't free this fid |
| 531 | */ |
| 532 | f->ref++; |
| 533 | QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); |
| 534 | f->fs_reclaim.dir.stream = f->fs.dir.stream; |
| 535 | f->fs.dir.stream = NULL; |
| 536 | reclaim_count++; |
| 537 | } |
| 538 | } |
| 539 | if (reclaim_count >= open_fd_rc) { |
| 540 | break; |
| 541 | } |
| 542 | } |
| 543 | /* |
| 544 | * Close the picked FIDs altogether on a background I/O driver thread. Do |
| 545 | * this all at once to keep latency (i.e. amount of thread hops between main |
| 546 | * thread <-> fs driver background thread) as low as possible. |
| 547 | */ |
| 548 | v9fs_co_run_in_worker({ |
| 549 | QSLIST_FOREACH(f, &reclaim_list, reclaim_next) { |
| 550 | err = (f->fid_type == P9_FID_DIR) ? |
| 551 | s->ops->closedir(&s->ctx, &f->fs_reclaim) : |
| 552 | s->ops->close(&s->ctx, &f->fs_reclaim); |
| 553 | |
| 554 | /* 'man 2 close' suggests to ignore close() errors except of EBADF */ |
| 555 | if (unlikely(err && errno == EBADF)) { |
| 556 | /* |
| 557 | * unexpected case as FIDs were picked above by having a valid |
| 558 | * file descriptor |
| 559 | */ |
| 560 | error_report("9pfs: v9fs_reclaim_fd() WARNING: close() failed with EBADF"); |
| 561 | } else { |
| 562 | /* total_open_fd must only be mutated on main thread */ |
| 563 | nclosed++; |
| 564 | } |
| 565 | } |
| 566 | }); |
| 567 | total_open_fd -= nclosed; |
| 568 | /* Free the closed FIDs. */ |
| 569 | while (!QSLIST_EMPTY(&reclaim_list)) { |
| 570 | f = QSLIST_FIRST(&reclaim_list); |
| 571 | QSLIST_REMOVE(&reclaim_list, f, V9fsFidState, reclaim_next); |
| 572 | /* |
| 573 | * Now drop the fid reference, free it |
| 574 | * if clunked. |
| 575 | */ |
| 576 | put_fid(pdu, f); |
| 577 | } |
| 578 | |
| 579 | s->reclaiming = false; |
| 580 | } |
| 581 | |
| 582 | /* |
| 583 | * This is used when a path is removed from the directory tree. Any |
| 584 | * fids that still reference it must not be closed from then on, since |
| 585 | * they cannot be reopened. |
| 586 | */ |
| 587 | static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) |
| 588 | { |
| 589 | int err = 0; |
| 590 | V9fsState *s = pdu->s; |
| 591 | V9fsFidState *fidp; |
| 592 | gpointer fid; |
| 593 | GHashTableIter iter; |
| 594 | /* |
| 595 | * The most common case is probably that we have exactly one |
| 596 | * fid for the given path, so preallocate exactly one. |
| 597 | */ |
| 598 | g_autoptr(GArray) to_reopen = g_array_sized_new(FALSE, FALSE, |
| 599 | sizeof(V9fsFidState *), 1); |
| 600 | gint i; |
| 601 | |
| 602 | v9fs_path_read_lock(s); |
| 603 | g_hash_table_iter_init(&iter, s->fids); |
| 604 | |
| 605 | /* |
| 606 | * We iterate over the fid table looking for the entries we need |
| 607 | * to reopen, and store them in to_reopen. This is because |
| 608 | * v9fs_reopen_fid() and put_fid() yield. This allows the fid table |
| 609 | * to be modified in the meantime, invalidating our iterator. |
| 610 | */ |
| 611 | while (g_hash_table_iter_next(&iter, &fid, (gpointer *) &fidp)) { |
| 612 | if (fidp->path.size == path->size && |
| 613 | !memcmp(fidp->path.data, path->data, path->size)) { |
| 614 | /* |
| 615 | * Ensure the fid survives a potential clunk request during |
| 616 | * v9fs_reopen_fid or put_fid. |
| 617 | */ |
| 618 | fidp->ref++; |
| 619 | fidp->flags |= FID_NON_RECLAIMABLE; |
| 620 | g_array_append_val(to_reopen, fidp); |
| 621 | } |
| 622 | } |
| 623 | v9fs_path_unlock(s); |
| 624 | |
| 625 | for (i = 0; i < to_reopen->len; i++) { |
| 626 | fidp = g_array_index(to_reopen, V9fsFidState*, i); |
| 627 | /* reopen the file/dir if already closed */ |
| 628 | err = v9fs_reopen_fid(pdu, fidp); |
| 629 | if (err < 0) { |
| 630 | break; |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | for (i = 0; i < to_reopen->len; i++) { |
| 635 | put_fid(pdu, g_array_index(to_reopen, V9fsFidState*, i)); |
| 636 | } |
| 637 | return err; |
| 638 | } |
| 639 | |
| 640 | static void coroutine_fn virtfs_reset(V9fsPDU *pdu) |
| 641 | { |
| 642 | V9fsState *s = pdu->s; |
| 643 | V9fsFidState *fidp; |
| 644 | GList *freeing; |
| 645 | /* |
| 646 | * Get a list of all the values (fid states) in the table, which |
| 647 | * we then... |
| 648 | */ |
| 649 | g_autoptr(GList) fids = g_hash_table_get_values(s->fids); |
| 650 | |
| 651 | /* ... remove from the table, taking over ownership. */ |
| 652 | g_hash_table_steal_all(s->fids); |
| 653 | |
| 654 | /* |
| 655 | * This allows us to release our references to them asynchronously without |
| 656 | * iterating over the hash table and risking iterator invalidation |
| 657 | * through concurrent modifications. |
| 658 | */ |
| 659 | for (freeing = fids; freeing; freeing = freeing->next) { |
| 660 | fidp = freeing->data; |
| 661 | fidp->ref++; |
| 662 | fidp->clunked = true; |
| 663 | put_fid(pdu, fidp); |
| 664 | } |
| 665 | |
| 666 | /* |
| 667 | * Explicitly reset the xattr FID counter. |
| 668 | * |
| 669 | * free_fid() already decrements the counter for each P9_FID_XATTR, so the |
| 670 | * counter should already be zero, hence this is just a defensive measure. |
| 671 | */ |
| 672 | s->ctx.xattr_fid_count = 0; |
| 673 | } |
| 674 | |
| 675 | #define P9_QID_TYPE_DIR 0x80 |
| 676 | #define P9_QID_TYPE_SYMLINK 0x02 |
| 677 | |
| 678 | #define P9_STAT_MODE_DIR 0x80000000 |
| 679 | #define P9_STAT_MODE_APPEND 0x40000000 |
| 680 | #define P9_STAT_MODE_EXCL 0x20000000 |
| 681 | #define P9_STAT_MODE_MOUNT 0x10000000 |
| 682 | #define P9_STAT_MODE_AUTH 0x08000000 |
| 683 | #define P9_STAT_MODE_TMP 0x04000000 |
| 684 | #define P9_STAT_MODE_SYMLINK 0x02000000 |
| 685 | #define P9_STAT_MODE_LINK 0x01000000 |
| 686 | #define P9_STAT_MODE_DEVICE 0x00800000 |
| 687 | #define P9_STAT_MODE_NAMED_PIPE 0x00200000 |
| 688 | #define P9_STAT_MODE_SOCKET 0x00100000 |
| 689 | #define P9_STAT_MODE_SETUID 0x00080000 |
| 690 | #define P9_STAT_MODE_SETGID 0x00040000 |
| 691 | #define P9_STAT_MODE_SETVTX 0x00010000 |
| 692 | |
| 693 | #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ |
| 694 | P9_STAT_MODE_SYMLINK | \ |
| 695 | P9_STAT_MODE_LINK | \ |
| 696 | P9_STAT_MODE_DEVICE | \ |
| 697 | P9_STAT_MODE_NAMED_PIPE | \ |
| 698 | P9_STAT_MODE_SOCKET) |
| 699 | |
| 700 | /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ |
| 701 | static inline uint8_t mirror8bit(uint8_t byte) |
| 702 | { |
| 703 | return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; |
| 704 | } |
| 705 | |
| 706 | /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ |
| 707 | static inline uint64_t mirror64bit(uint64_t value) |
| 708 | { |
| 709 | return ((uint64_t)mirror8bit(value & 0xff) << 56) | |
| 710 | ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | |
| 711 | ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | |
| 712 | ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | |
| 713 | ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | |
| 714 | ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | |
| 715 | ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | |
| 716 | ((uint64_t)mirror8bit((value >> 56) & 0xff)); |
| 717 | } |
| 718 | |
| 719 | /* |
| 720 | * Parameter k for the Exponential Golomb algorithm to be used. |
| 721 | * |
| 722 | * The smaller this value, the smaller the minimum bit count for the Exp. |
| 723 | * Golomb generated affixes will be (at lowest index) however for the |
| 724 | * price of having higher maximum bit count of generated affixes (at highest |
| 725 | * index). Likewise increasing this parameter yields in smaller maximum bit |
| 726 | * count for the price of having higher minimum bit count. |
| 727 | * |
| 728 | * In practice that means: a good value for k depends on the expected amount |
| 729 | * of devices to be exposed by one export. For a small amount of devices k |
| 730 | * should be small, for a large amount of devices k might be increased |
| 731 | * instead. The default of k=0 should be fine for most users though. |
| 732 | * |
| 733 | * IMPORTANT: In case this ever becomes a runtime parameter; the value of |
| 734 | * k should not change as long as guest is still running! Because that would |
| 735 | * cause completely different inode numbers to be generated on guest. |
| 736 | */ |
| 737 | #define EXP_GOLOMB_K 0 |
| 738 | |
| 739 | /** |
| 740 | * expGolombEncode() - Exponential Golomb algorithm for arbitrary k |
| 741 | * (including k=0). |
| 742 | * |
| 743 | * @n: natural number (or index) of the prefix to be generated |
| 744 | * (1, 2, 3, ...) |
| 745 | * @k: parameter k of Exp. Golomb algorithm to be used |
| 746 | * (see comment on EXP_GOLOMB_K macro for details about k) |
| 747 | * Return: prefix for given @n and @k |
| 748 | * |
| 749 | * The Exponential Golomb algorithm generates prefixes (NOT suffixes!) |
| 750 | * with growing length and with the mathematical property of being |
| 751 | * "prefix-free". The latter means the generated prefixes can be prepended |
| 752 | * in front of arbitrary numbers and the resulting concatenated numbers are |
| 753 | * guaranteed to be always unique. |
| 754 | * |
| 755 | * This is a minor adjustment to the original Exp. Golomb algorithm in the |
| 756 | * sense that lowest allowed index (@n) starts with 1, not with zero. |
| 757 | */ |
| 758 | static VariLenAffix expGolombEncode(uint64_t n, int k) |
| 759 | { |
| 760 | const uint64_t value = n + (1 << k) - 1; |
| 761 | const int bits = (int) log2(value) + 1; |
| 762 | return (VariLenAffix) { |
| 763 | .type = AffixType_Prefix, |
| 764 | .value = value, |
| 765 | .bits = bits + MAX((bits - 1 - k), 0) |
| 766 | }; |
| 767 | } |
| 768 | |
| 769 | /** |
| 770 | * invertAffix() - Converts a suffix into a prefix, or a prefix into a suffix. |
| 771 | * @affix: either suffix or prefix to be inverted |
| 772 | * Return: inversion of passed @affix |
| 773 | * |
| 774 | * Simply mirror all bits of the affix value, for the purpose to preserve |
| 775 | * respectively the mathematical "prefix-free" or "suffix-free" property |
| 776 | * after the conversion. |
| 777 | * |
| 778 | * If a passed prefix is suitable to create unique numbers, then the |
| 779 | * returned suffix is suitable to create unique numbers as well (and vice |
| 780 | * versa). |
| 781 | */ |
| 782 | static VariLenAffix invertAffix(const VariLenAffix *affix) |
| 783 | { |
| 784 | return (VariLenAffix) { |
| 785 | .type = |
| 786 | (affix->type == AffixType_Suffix) ? |
| 787 | AffixType_Prefix : AffixType_Suffix, |
| 788 | .value = |
| 789 | mirror64bit(affix->value) >> |
| 790 | ((sizeof(affix->value) * 8) - affix->bits), |
| 791 | .bits = affix->bits |
| 792 | }; |
| 793 | } |
| 794 | |
| 795 | /** |
| 796 | * affixForIndex() - Generates suffix numbers with "suffix-free" property. |
| 797 | * @index: natural number (or index) of the suffix to be generated |
| 798 | * (1, 2, 3, ...) |
| 799 | * Return: Suffix suitable to assemble unique number. |
| 800 | * |
| 801 | * This is just a wrapper function on top of the Exp. Golomb algorithm. |
| 802 | * |
| 803 | * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, |
| 804 | * this function converts the Exp. Golomb prefixes into appropriate suffixes |
| 805 | * which are still suitable for generating unique numbers. |
| 806 | */ |
| 807 | static VariLenAffix affixForIndex(uint64_t index) |
| 808 | { |
| 809 | VariLenAffix prefix; |
| 810 | prefix = expGolombEncode(index, EXP_GOLOMB_K); |
| 811 | return invertAffix(&prefix); /* convert prefix to suffix */ |
| 812 | } |
| 813 | |
| 814 | static uint32_t qpp_hash(QppEntry e) |
| 815 | { |
| 816 | return qemu_xxhash4(e.ino_prefix, e.dev); |
| 817 | } |
| 818 | |
| 819 | static uint32_t qpf_hash(QpfEntry e) |
| 820 | { |
| 821 | return qemu_xxhash4(e.ino, e.dev); |
| 822 | } |
| 823 | |
| 824 | static bool qpd_cmp_func(const void *obj, const void *userp) |
| 825 | { |
| 826 | const QpdEntry *e1 = obj, *e2 = userp; |
| 827 | return e1->dev == e2->dev; |
| 828 | } |
| 829 | |
| 830 | static bool qpp_cmp_func(const void *obj, const void *userp) |
| 831 | { |
| 832 | const QppEntry *e1 = obj, *e2 = userp; |
| 833 | return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; |
| 834 | } |
| 835 | |
| 836 | static bool qpf_cmp_func(const void *obj, const void *userp) |
| 837 | { |
| 838 | const QpfEntry *e1 = obj, *e2 = userp; |
| 839 | return e1->dev == e2->dev && e1->ino == e2->ino; |
| 840 | } |
| 841 | |
| 842 | static void qp_table_remove(void *p, uint32_t h, void *up) |
| 843 | { |
| 844 | g_free(p); |
| 845 | } |
| 846 | |
| 847 | static void qp_table_destroy(struct qht *ht) |
| 848 | { |
| 849 | if (!ht || !ht->map) { |
| 850 | return; |
| 851 | } |
| 852 | qht_iter(ht, qp_table_remove, NULL); |
| 853 | qht_destroy(ht); |
| 854 | } |
| 855 | |
| 856 | static void qpd_table_init(struct qht *ht) |
| 857 | { |
| 858 | qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); |
| 859 | } |
| 860 | |
| 861 | static void qpp_table_init(struct qht *ht) |
| 862 | { |
| 863 | qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); |
| 864 | } |
| 865 | |
| 866 | static void qpf_table_init(struct qht *ht) |
| 867 | { |
| 868 | qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * Returns how many (high end) bits of inode numbers of the passed fs |
| 873 | * device shall be used (in combination with the device number) to |
| 874 | * generate hash values for qpp_table entries. |
| 875 | * |
| 876 | * This function is required if variable length suffixes are used for inode |
| 877 | * number mapping on guest level. Since a device may end up having multiple |
| 878 | * entries in qpp_table, each entry most probably with a different suffix |
| 879 | * length, we thus need this function in conjunction with qpd_table to |
| 880 | * "agree" about a fix amount of bits (per device) to be always used for |
| 881 | * generating hash values for the purpose of accessing qpp_table in order |
| 882 | * get consistent behaviour when accessing qpp_table. |
| 883 | */ |
| 884 | static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) |
| 885 | { |
| 886 | QpdEntry lookup = { |
| 887 | .dev = dev |
| 888 | }, *val; |
| 889 | uint32_t hash = dev; |
| 890 | VariLenAffix affix; |
| 891 | |
| 892 | val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); |
| 893 | if (!val) { |
| 894 | val = g_new0(QpdEntry, 1); |
| 895 | *val = lookup; |
| 896 | affix = affixForIndex(pdu->s->qp_affix_next); |
| 897 | val->prefix_bits = affix.bits; |
| 898 | qht_insert(&pdu->s->qpd_table, val, hash, NULL); |
| 899 | pdu->s->qp_ndevices++; |
| 900 | } |
| 901 | return val->prefix_bits; |
| 902 | } |
| 903 | |
| 904 | /* |
| 905 | * Slow / full mapping host inode nr -> guest inode nr. |
| 906 | * |
| 907 | * This function performs a slower and much more costly remapping of an |
| 908 | * original file inode number on host to an appropriate different inode |
| 909 | * number on guest. For every (dev, inode) combination on host a new |
| 910 | * sequential number is generated, cached and exposed as inode number on |
| 911 | * guest. |
| 912 | * |
| 913 | * This is just a "last resort" fallback solution if the much faster/cheaper |
| 914 | * qid_path_suffixmap() failed. In practice this slow / full mapping is not |
| 915 | * expected ever to be used at all though. |
| 916 | * |
| 917 | * See qid_path_suffixmap() for details |
| 918 | * |
| 919 | */ |
| 920 | static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, |
| 921 | uint64_t *path) |
| 922 | { |
| 923 | QpfEntry lookup = { |
| 924 | .dev = stbuf->st_dev, |
| 925 | .ino = stbuf->st_ino |
| 926 | }, *val; |
| 927 | uint32_t hash = qpf_hash(lookup); |
| 928 | VariLenAffix affix; |
| 929 | |
| 930 | val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); |
| 931 | |
| 932 | if (!val) { |
| 933 | if (pdu->s->qp_fullpath_next == 0) { |
| 934 | /* no more files can be mapped :'( */ |
| 935 | error_report_once( |
| 936 | "9p: No more prefixes available for remapping inodes from " |
| 937 | "host to guest." |
| 938 | ); |
| 939 | return -ENFILE; |
| 940 | } |
| 941 | |
| 942 | val = g_new0(QpfEntry, 1); |
| 943 | *val = lookup; |
| 944 | |
| 945 | /* new unique inode and device combo */ |
| 946 | affix = affixForIndex( |
| 947 | 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) |
| 948 | ); |
| 949 | val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; |
| 950 | pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); |
| 951 | qht_insert(&pdu->s->qpf_table, val, hash, NULL); |
| 952 | } |
| 953 | |
| 954 | *path = val->path; |
| 955 | return 0; |
| 956 | } |
| 957 | |
| 958 | /* |
| 959 | * Quick mapping host inode nr -> guest inode nr. |
| 960 | * |
| 961 | * This function performs quick remapping of an original file inode number |
| 962 | * on host to an appropriate different inode number on guest. This remapping |
| 963 | * of inodes is required to avoid inode nr collisions on guest which would |
| 964 | * happen if the 9p export contains more than 1 exported file system (or |
| 965 | * more than 1 file system data set), because unlike on host level where the |
| 966 | * files would have different device nrs, all files exported by 9p would |
| 967 | * share the same device nr on guest (the device nr of the virtual 9p device |
| 968 | * that is). |
| 969 | * |
| 970 | * Inode remapping is performed by chopping off high end bits of the original |
| 971 | * inode number from host, shifting the result upwards and then assigning a |
| 972 | * generated suffix number for the low end bits, where the same suffix number |
| 973 | * will be shared by all inodes with the same device id AND the same high end |
| 974 | * bits that have been chopped off. That approach utilizes the fact that inode |
| 975 | * numbers very likely share the same high end bits (i.e. due to their common |
| 976 | * sequential generation by file systems) and hence we only have to generate |
| 977 | * and track a very limited amount of suffixes in practice due to that. |
| 978 | * |
| 979 | * We generate variable size suffixes for that purpose. The 1st generated |
| 980 | * suffix will only have 1 bit and hence we only need to chop off 1 bit from |
| 981 | * the original inode number. The subsequent suffixes being generated will |
| 982 | * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being |
| 983 | * generated will have 3 bits and hence we have to chop off 3 bits from their |
| 984 | * original inodes, and so on. That approach of using variable length suffixes |
| 985 | * (i.e. over fixed size ones) utilizes the fact that in practice only a very |
| 986 | * limited amount of devices are shared by the same export (e.g. typically |
| 987 | * less than 2 dozen devices per 9p export), so in practice we need to chop |
| 988 | * off less bits than with fixed size prefixes and yet are flexible to add |
| 989 | * new devices at runtime below host's export directory at any time without |
| 990 | * having to reboot guest nor requiring to reconfigure guest for that. And due |
| 991 | * to the very limited amount of original high end bits that we chop off that |
| 992 | * way, the total amount of suffixes we need to generate is less than by using |
| 993 | * fixed size prefixes and hence it also improves performance of the inode |
| 994 | * remapping algorithm, and finally has the nice side effect that the inode |
| 995 | * numbers on guest will be much smaller & human friendly. ;-) |
| 996 | */ |
| 997 | static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, |
| 998 | uint64_t *path) |
| 999 | { |
| 1000 | const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); |
| 1001 | QppEntry lookup = { |
| 1002 | .dev = stbuf->st_dev, |
| 1003 | .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) |
| 1004 | }, *val; |
| 1005 | uint32_t hash = qpp_hash(lookup); |
| 1006 | |
| 1007 | val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); |
| 1008 | |
| 1009 | if (!val) { |
| 1010 | if (pdu->s->qp_affix_next == 0) { |
| 1011 | /* we ran out of affixes */ |
| 1012 | warn_report_once( |
| 1013 | "9p: Potential degraded performance of inode remapping" |
| 1014 | ); |
| 1015 | return -ENFILE; |
| 1016 | } |
| 1017 | |
| 1018 | val = g_new0(QppEntry, 1); |
| 1019 | *val = lookup; |
| 1020 | |
| 1021 | /* new unique inode affix and device combo */ |
| 1022 | val->qp_affix_index = pdu->s->qp_affix_next++; |
| 1023 | val->qp_affix = affixForIndex(val->qp_affix_index); |
| 1024 | qht_insert(&pdu->s->qpp_table, val, hash, NULL); |
| 1025 | } |
| 1026 | /* assuming generated affix to be suffix type, not prefix */ |
| 1027 | *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; |
| 1028 | return 0; |
| 1029 | } |
| 1030 | |
| 1031 | static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) |
| 1032 | { |
| 1033 | int err; |
| 1034 | size_t size; |
| 1035 | |
| 1036 | if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { |
| 1037 | /* map inode+device to qid path (fast path) */ |
| 1038 | err = qid_path_suffixmap(pdu, stbuf, &qidp->path); |
| 1039 | if (err == -ENFILE) { |
| 1040 | /* fast path didn't work, fall back to full map */ |
| 1041 | err = qid_path_fullmap(pdu, stbuf, &qidp->path); |
| 1042 | } |
| 1043 | if (err) { |
| 1044 | return err; |
| 1045 | } |
| 1046 | } else { |
| 1047 | if (pdu->s->dev_id != stbuf->st_dev) { |
| 1048 | if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { |
| 1049 | error_report_once( |
| 1050 | "9p: Multiple devices detected in same VirtFS export. " |
| 1051 | "Access of guest to additional devices is (partly) " |
| 1052 | "denied due to virtfs option 'multidevs=forbid' being " |
| 1053 | "effective." |
| 1054 | ); |
| 1055 | return -ENODEV; |
| 1056 | } else { |
| 1057 | warn_report_once( |
| 1058 | "9p: Multiple devices detected in same VirtFS export, " |
| 1059 | "which might lead to file ID collisions and severe " |
| 1060 | "misbehaviours on guest! You should either use a " |
| 1061 | "separate export for each device shared from host or " |
| 1062 | "use virtfs option 'multidevs=remap'!" |
| 1063 | ); |
| 1064 | } |
| 1065 | } |
| 1066 | memset(&qidp->path, 0, sizeof(qidp->path)); |
| 1067 | size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); |
| 1068 | memcpy(&qidp->path, &stbuf->st_ino, size); |
| 1069 | } |
| 1070 | |
| 1071 | qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); |
| 1072 | qidp->type = 0; |
| 1073 | if (S_ISDIR(stbuf->st_mode)) { |
| 1074 | qidp->type |= P9_QID_TYPE_DIR; |
| 1075 | } |
| 1076 | if (S_ISLNK(stbuf->st_mode)) { |
| 1077 | qidp->type |= P9_QID_TYPE_SYMLINK; |
| 1078 | } |
| 1079 | |
| 1080 | return 0; |
| 1081 | } |
| 1082 | |
| 1083 | V9fsPDU *pdu_alloc(V9fsState *s) |
| 1084 | { |
| 1085 | V9fsPDU *pdu = NULL; |
| 1086 | |
| 1087 | if (!QLIST_EMPTY(&s->free_list)) { |
| 1088 | pdu = QLIST_FIRST(&s->free_list); |
| 1089 | QLIST_REMOVE(pdu, next); |
| 1090 | QLIST_INSERT_HEAD(&s->active_list, pdu, next); |
| 1091 | } |
| 1092 | return pdu; |
| 1093 | } |
| 1094 | |
| 1095 | void pdu_free(V9fsPDU *pdu) |
| 1096 | { |
| 1097 | V9fsState *s = pdu->s; |
| 1098 | |
| 1099 | g_assert(!pdu->cancelled); |
| 1100 | QLIST_REMOVE(pdu, next); |
| 1101 | QLIST_INSERT_HEAD(&s->free_list, pdu, next); |
| 1102 | } |
| 1103 | |
| 1104 | static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) |
| 1105 | { |
| 1106 | int8_t id = pdu->id + 1; /* Response */ |
| 1107 | V9fsState *s = pdu->s; |
| 1108 | int ret; |
| 1109 | |
| 1110 | /* |
| 1111 | * The 9p spec requires that successfully cancelled pdus receive no reply. |
| 1112 | * Sending a reply would confuse clients because they would |
| 1113 | * assume that any EINTR is the actual result of the operation, |
| 1114 | * rather than a consequence of the cancellation. However, if |
| 1115 | * the operation completed (successfully or with an error other |
| 1116 | * than caused be cancellation), we do send out that reply, both |
| 1117 | * for efficiency and to avoid confusing the rest of the state machine |
| 1118 | * that assumes passing a non-error here will mean a successful |
| 1119 | * transmission of the reply. |
| 1120 | */ |
| 1121 | bool discard = pdu->cancelled && len == -EINTR; |
| 1122 | if (discard) { |
| 1123 | trace_v9fs_rcancel(pdu->tag, pdu->id); |
| 1124 | pdu->size = 0; |
| 1125 | goto out_notify; |
| 1126 | } |
| 1127 | |
| 1128 | if (len < 0) { |
| 1129 | int err = -len; |
| 1130 | len = 7; |
| 1131 | |
| 1132 | if (s->proto_version != V9FS_PROTO_2000L) { |
| 1133 | V9fsString str; |
| 1134 | |
| 1135 | str.data = strerror(err); |
| 1136 | str.size = strlen(str.data); |
| 1137 | |
| 1138 | ret = pdu_marshal(pdu, len, "s", &str); |
| 1139 | if (ret < 0) { |
| 1140 | goto out_notify; |
| 1141 | } |
| 1142 | len += ret; |
| 1143 | id = P9_RERROR; |
| 1144 | } else { |
| 1145 | err = errno_to_dotl(err); |
| 1146 | } |
| 1147 | |
| 1148 | ret = pdu_marshal(pdu, len, "d", err); |
| 1149 | if (ret < 0) { |
| 1150 | goto out_notify; |
| 1151 | } |
| 1152 | len += ret; |
| 1153 | |
| 1154 | if (s->proto_version == V9FS_PROTO_2000L) { |
| 1155 | id = P9_RLERROR; |
| 1156 | } |
| 1157 | trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ |
| 1158 | } |
| 1159 | |
| 1160 | /* fill out the header */ |
| 1161 | if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { |
| 1162 | goto out_notify; |
| 1163 | } |
| 1164 | |
| 1165 | /* keep these in sync */ |
| 1166 | pdu->size = len; |
| 1167 | pdu->id = id; |
| 1168 | |
| 1169 | out_notify: |
| 1170 | pdu->s->transport->push_and_notify(pdu); |
| 1171 | |
| 1172 | /* Now wakeup anybody waiting in flush for this request */ |
| 1173 | if (!qemu_co_queue_next(&pdu->complete)) { |
| 1174 | pdu_free(pdu); |
| 1175 | } |
| 1176 | } |
| 1177 | |
| 1178 | static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) |
| 1179 | { |
| 1180 | mode_t ret; |
| 1181 | |
| 1182 | ret = mode & 0777; |
| 1183 | if (mode & P9_STAT_MODE_DIR) { |
| 1184 | ret |= S_IFDIR; |
| 1185 | } |
| 1186 | |
| 1187 | if (mode & P9_STAT_MODE_SYMLINK) { |
| 1188 | ret |= S_IFLNK; |
| 1189 | } |
| 1190 | if (mode & P9_STAT_MODE_SOCKET) { |
| 1191 | ret |= S_IFSOCK; |
| 1192 | } |
| 1193 | if (mode & P9_STAT_MODE_NAMED_PIPE) { |
| 1194 | ret |= S_IFIFO; |
| 1195 | } |
| 1196 | if (mode & P9_STAT_MODE_DEVICE) { |
| 1197 | if (extension->size && extension->data[0] == 'c') { |
| 1198 | ret |= S_IFCHR; |
| 1199 | } else { |
| 1200 | ret |= S_IFBLK; |
| 1201 | } |
| 1202 | } |
| 1203 | |
| 1204 | if (!(ret & ~0777)) { |
| 1205 | ret |= S_IFREG; |
| 1206 | } |
| 1207 | |
| 1208 | if (mode & P9_STAT_MODE_SETUID) { |
| 1209 | ret |= S_ISUID; |
| 1210 | } |
| 1211 | if (mode & P9_STAT_MODE_SETGID) { |
| 1212 | ret |= S_ISGID; |
| 1213 | } |
| 1214 | if (mode & P9_STAT_MODE_SETVTX) { |
| 1215 | ret |= S_ISVTX; |
| 1216 | } |
| 1217 | |
| 1218 | return ret; |
| 1219 | } |
| 1220 | |
| 1221 | static int donttouch_stat(V9fsStat *stat) |
| 1222 | { |
| 1223 | if (stat->type == -1 && |
| 1224 | stat->dev == -1 && |
| 1225 | stat->qid.type == 0xff && |
| 1226 | stat->qid.version == (uint32_t) -1 && |
| 1227 | stat->qid.path == (uint64_t) -1 && |
| 1228 | stat->mode == -1 && |
| 1229 | stat->atime == -1 && |
| 1230 | stat->mtime == -1 && |
| 1231 | stat->length == -1 && |
| 1232 | !stat->name.size && |
| 1233 | !stat->uid.size && |
| 1234 | !stat->gid.size && |
| 1235 | !stat->muid.size && |
| 1236 | stat->n_uid == -1 && |
| 1237 | stat->n_gid == -1 && |
| 1238 | stat->n_muid == -1) { |
| 1239 | return 1; |
| 1240 | } |
| 1241 | |
| 1242 | return 0; |
| 1243 | } |
| 1244 | |
| 1245 | static void v9fs_stat_init(V9fsStat *stat) |
| 1246 | { |
| 1247 | v9fs_string_init(&stat->name); |
| 1248 | v9fs_string_init(&stat->uid); |
| 1249 | v9fs_string_init(&stat->gid); |
| 1250 | v9fs_string_init(&stat->muid); |
| 1251 | v9fs_string_init(&stat->extension); |
| 1252 | } |
| 1253 | |
| 1254 | static void v9fs_stat_free(V9fsStat *stat) |
| 1255 | { |
| 1256 | v9fs_string_free(&stat->name); |
| 1257 | v9fs_string_free(&stat->uid); |
| 1258 | v9fs_string_free(&stat->gid); |
| 1259 | v9fs_string_free(&stat->muid); |
| 1260 | v9fs_string_free(&stat->extension); |
| 1261 | } |
| 1262 | |
| 1263 | static uint32_t stat_to_v9mode(const struct stat *stbuf) |
| 1264 | { |
| 1265 | uint32_t mode; |
| 1266 | |
| 1267 | mode = stbuf->st_mode & 0777; |
| 1268 | if (S_ISDIR(stbuf->st_mode)) { |
| 1269 | mode |= P9_STAT_MODE_DIR; |
| 1270 | } |
| 1271 | |
| 1272 | if (S_ISLNK(stbuf->st_mode)) { |
| 1273 | mode |= P9_STAT_MODE_SYMLINK; |
| 1274 | } |
| 1275 | |
| 1276 | if (S_ISSOCK(stbuf->st_mode)) { |
| 1277 | mode |= P9_STAT_MODE_SOCKET; |
| 1278 | } |
| 1279 | |
| 1280 | if (S_ISFIFO(stbuf->st_mode)) { |
| 1281 | mode |= P9_STAT_MODE_NAMED_PIPE; |
| 1282 | } |
| 1283 | |
| 1284 | if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { |
| 1285 | mode |= P9_STAT_MODE_DEVICE; |
| 1286 | } |
| 1287 | |
| 1288 | if (stbuf->st_mode & S_ISUID) { |
| 1289 | mode |= P9_STAT_MODE_SETUID; |
| 1290 | } |
| 1291 | |
| 1292 | if (stbuf->st_mode & S_ISGID) { |
| 1293 | mode |= P9_STAT_MODE_SETGID; |
| 1294 | } |
| 1295 | |
| 1296 | if (stbuf->st_mode & S_ISVTX) { |
| 1297 | mode |= P9_STAT_MODE_SETVTX; |
| 1298 | } |
| 1299 | |
| 1300 | return mode; |
| 1301 | } |
| 1302 | |
| 1303 | static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, |
| 1304 | const char *basename, |
| 1305 | const struct stat *stbuf, |
| 1306 | V9fsStat *v9stat) |
| 1307 | { |
| 1308 | int err; |
| 1309 | |
| 1310 | memset(v9stat, 0, sizeof(*v9stat)); |
| 1311 | |
| 1312 | err = stat_to_qid(pdu, stbuf, &v9stat->qid); |
| 1313 | if (err < 0) { |
| 1314 | return err; |
| 1315 | } |
| 1316 | v9stat->mode = stat_to_v9mode(stbuf); |
| 1317 | v9stat->atime = stbuf->st_atime; |
| 1318 | v9stat->mtime = stbuf->st_mtime; |
| 1319 | v9stat->length = stbuf->st_size; |
| 1320 | |
| 1321 | v9fs_string_free(&v9stat->uid); |
| 1322 | v9fs_string_free(&v9stat->gid); |
| 1323 | v9fs_string_free(&v9stat->muid); |
| 1324 | |
| 1325 | v9stat->n_uid = stbuf->st_uid; |
| 1326 | v9stat->n_gid = stbuf->st_gid; |
| 1327 | v9stat->n_muid = 0; |
| 1328 | |
| 1329 | v9fs_string_free(&v9stat->extension); |
| 1330 | |
| 1331 | if (v9stat->mode & P9_STAT_MODE_SYMLINK) { |
| 1332 | err = v9fs_co_readlink(pdu, path, &v9stat->extension); |
| 1333 | if (err < 0) { |
| 1334 | return err; |
| 1335 | } |
| 1336 | } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { |
| 1337 | v9fs_string_sprintf(&v9stat->extension, "%c %u %u", |
| 1338 | S_ISCHR(stbuf->st_mode) ? 'c' : 'b', |
| 1339 | major(stbuf->st_rdev), minor(stbuf->st_rdev)); |
| 1340 | } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { |
| 1341 | v9fs_string_sprintf(&v9stat->extension, "%s %lu", |
| 1342 | "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); |
| 1343 | } |
| 1344 | |
| 1345 | v9fs_string_sprintf(&v9stat->name, "%s", basename); |
| 1346 | |
| 1347 | v9stat->size = 61 + |
| 1348 | v9fs_string_size(&v9stat->name) + |
| 1349 | v9fs_string_size(&v9stat->uid) + |
| 1350 | v9fs_string_size(&v9stat->gid) + |
| 1351 | v9fs_string_size(&v9stat->muid) + |
| 1352 | v9fs_string_size(&v9stat->extension); |
| 1353 | return 0; |
| 1354 | } |
| 1355 | |
| 1356 | #define P9_STATS_MODE 0x00000001ULL |
| 1357 | #define P9_STATS_NLINK 0x00000002ULL |
| 1358 | #define P9_STATS_UID 0x00000004ULL |
| 1359 | #define P9_STATS_GID 0x00000008ULL |
| 1360 | #define P9_STATS_RDEV 0x00000010ULL |
| 1361 | #define P9_STATS_ATIME 0x00000020ULL |
| 1362 | #define P9_STATS_MTIME 0x00000040ULL |
| 1363 | #define P9_STATS_CTIME 0x00000080ULL |
| 1364 | #define P9_STATS_INO 0x00000100ULL |
| 1365 | #define P9_STATS_SIZE 0x00000200ULL |
| 1366 | #define P9_STATS_BLOCKS 0x00000400ULL |
| 1367 | |
| 1368 | #define P9_STATS_BTIME 0x00000800ULL |
| 1369 | #define P9_STATS_GEN 0x00001000ULL |
| 1370 | #define P9_STATS_DATA_VERSION 0x00002000ULL |
| 1371 | |
| 1372 | #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ |
| 1373 | #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ |
| 1374 | |
| 1375 | |
| 1376 | /** |
| 1377 | * blksize_to_iounit() - Block size exposed to 9p client. |
| 1378 | * Return: block size |
| 1379 | * |
| 1380 | * @pdu: 9p client request |
| 1381 | * @blksize: host filesystem's block size |
| 1382 | * |
| 1383 | * Convert host filesystem's block size into an appropriate block size for |
| 1384 | * 9p client (guest OS side). The value returned suggests an "optimum" block |
| 1385 | * size for 9p I/O, i.e. to maximize performance. |
| 1386 | */ |
| 1387 | static int32_t blksize_to_iounit(const V9fsPDU *pdu, int32_t blksize) |
| 1388 | { |
| 1389 | int32_t iounit = 0; |
| 1390 | V9fsState *s = pdu->s; |
| 1391 | |
| 1392 | /* |
| 1393 | * iounit should be multiples of blksize (host filesystem block size) |
| 1394 | * as well as less than (client msize - P9_IOHDRSZ) |
| 1395 | */ |
| 1396 | if (blksize) { |
| 1397 | iounit = QEMU_ALIGN_DOWN(s->msize - P9_IOHDRSZ, blksize); |
| 1398 | } |
| 1399 | if (!iounit) { |
| 1400 | iounit = s->msize - P9_IOHDRSZ; |
| 1401 | } |
| 1402 | return iounit; |
| 1403 | } |
| 1404 | |
| 1405 | static int32_t stat_to_iounit(const V9fsPDU *pdu, const struct stat *stbuf) |
| 1406 | { |
| 1407 | return blksize_to_iounit(pdu, stbuf->st_blksize); |
| 1408 | } |
| 1409 | |
| 1410 | static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, |
| 1411 | V9fsStatDotl *v9lstat) |
| 1412 | { |
| 1413 | memset(v9lstat, 0, sizeof(*v9lstat)); |
| 1414 | |
| 1415 | v9lstat->st_mode = stbuf->st_mode; |
| 1416 | v9lstat->st_nlink = stbuf->st_nlink; |
| 1417 | v9lstat->st_uid = stbuf->st_uid; |
| 1418 | v9lstat->st_gid = stbuf->st_gid; |
| 1419 | v9lstat->st_rdev = host_dev_to_dotl_dev(stbuf->st_rdev); |
| 1420 | v9lstat->st_size = stbuf->st_size; |
| 1421 | v9lstat->st_blksize = stat_to_iounit(pdu, stbuf); |
| 1422 | v9lstat->st_blocks = stbuf->st_blocks; |
| 1423 | v9lstat->st_atime_sec = stbuf->st_atime; |
| 1424 | v9lstat->st_mtime_sec = stbuf->st_mtime; |
| 1425 | v9lstat->st_ctime_sec = stbuf->st_ctime; |
| 1426 | #ifdef CONFIG_DARWIN |
| 1427 | v9lstat->st_atime_nsec = stbuf->st_atimespec.tv_nsec; |
| 1428 | v9lstat->st_mtime_nsec = stbuf->st_mtimespec.tv_nsec; |
| 1429 | v9lstat->st_ctime_nsec = stbuf->st_ctimespec.tv_nsec; |
| 1430 | #else |
| 1431 | v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; |
| 1432 | v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; |
| 1433 | v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; |
| 1434 | #endif |
| 1435 | /* Currently we only support BASIC fields in stat */ |
| 1436 | v9lstat->st_result_mask = P9_STATS_BASIC; |
| 1437 | |
| 1438 | return stat_to_qid(pdu, stbuf, &v9lstat->qid); |
| 1439 | } |
| 1440 | |
| 1441 | static void print_sg(struct iovec *sg, int cnt) |
| 1442 | { |
| 1443 | int i; |
| 1444 | |
| 1445 | printf("sg[%d]: {", cnt); |
| 1446 | for (i = 0; i < cnt; i++) { |
| 1447 | if (i) { |
| 1448 | printf(", "); |
| 1449 | } |
| 1450 | printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); |
| 1451 | } |
| 1452 | printf("}\n"); |
| 1453 | } |
| 1454 | |
| 1455 | /* Will call this only for path name based fid */ |
| 1456 | static int v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) |
| 1457 | { |
| 1458 | V9fsPath str; |
| 1459 | int ret; |
| 1460 | v9fs_path_init(&str); |
| 1461 | v9fs_path_copy(&str, dst); |
| 1462 | ret = v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); |
| 1463 | v9fs_path_free(&str); |
| 1464 | return ret; |
| 1465 | } |
| 1466 | |
| 1467 | static inline bool is_ro_export(FsContext *ctx) |
| 1468 | { |
| 1469 | return ctx->export_flags & V9FS_RDONLY; |
| 1470 | } |
| 1471 | |
| 1472 | static void coroutine_fn v9fs_version(void *opaque) |
| 1473 | { |
| 1474 | ssize_t err; |
| 1475 | V9fsPDU *pdu = opaque; |
| 1476 | V9fsState *s = pdu->s; |
| 1477 | V9fsString version; |
| 1478 | size_t offset = 7; |
| 1479 | |
| 1480 | v9fs_string_init(&version); |
| 1481 | err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); |
| 1482 | if (err < 0) { |
| 1483 | goto out; |
| 1484 | } |
| 1485 | trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); |
| 1486 | |
| 1487 | virtfs_reset(pdu); |
| 1488 | |
| 1489 | if (!strcmp(version.data, "9P2000.u")) { |
| 1490 | s->proto_version = V9FS_PROTO_2000U; |
| 1491 | } else if (!strcmp(version.data, "9P2000.L")) { |
| 1492 | s->proto_version = V9FS_PROTO_2000L; |
| 1493 | } else { |
| 1494 | v9fs_string_sprintf(&version, "unknown"); |
| 1495 | /* skip min. msize check, reporting invalid version has priority */ |
| 1496 | goto marshal; |
| 1497 | } |
| 1498 | |
| 1499 | if (s->msize < P9_MIN_MSIZE) { |
| 1500 | err = -EMSGSIZE; |
| 1501 | error_report( |
| 1502 | "9pfs: Client requested msize < minimum msize (" |
| 1503 | stringify(P9_MIN_MSIZE) ") supported by this server." |
| 1504 | ); |
| 1505 | goto out; |
| 1506 | } |
| 1507 | |
| 1508 | /* cap msize to transport's theoretical limit */ |
| 1509 | if (s->transport->msize_limit) { |
| 1510 | size_t limit = s->transport->msize_limit(s); |
| 1511 | if (s->msize > limit) { |
| 1512 | s->msize = limit; |
| 1513 | warn_report_once("9p: client msize capped to %zu (transport limit)", |
| 1514 | limit); |
| 1515 | } |
| 1516 | } |
| 1517 | |
| 1518 | /* 8192 is the default msize of Linux clients */ |
| 1519 | if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { |
| 1520 | warn_report_once( |
| 1521 | "9p: degraded performance: a reasonable high msize should be " |
| 1522 | "chosen on client/guest side (chosen msize is <= 8192). See " |
| 1523 | "https://wiki.qemu.org/Documentation/9psetup#msize for details." |
| 1524 | ); |
| 1525 | } |
| 1526 | |
| 1527 | marshal: |
| 1528 | err = pdu_marshal(pdu, offset, "ds", s->msize, &version); |
| 1529 | if (err < 0) { |
| 1530 | goto out; |
| 1531 | } |
| 1532 | err += offset; |
| 1533 | trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); |
| 1534 | out: |
| 1535 | pdu_complete(pdu, err); |
| 1536 | v9fs_string_free(&version); |
| 1537 | } |
| 1538 | |
| 1539 | static void coroutine_fn v9fs_attach(void *opaque) |
| 1540 | { |
| 1541 | V9fsPDU *pdu = opaque; |
| 1542 | V9fsState *s = pdu->s; |
| 1543 | int32_t fid, afid, n_uname; |
| 1544 | V9fsString uname, aname; |
| 1545 | V9fsFidState *fidp; |
| 1546 | size_t offset = 7; |
| 1547 | V9fsQID qid; |
| 1548 | ssize_t err; |
| 1549 | struct stat stbuf; |
| 1550 | |
| 1551 | v9fs_string_init(&uname); |
| 1552 | v9fs_string_init(&aname); |
| 1553 | err = pdu_unmarshal(pdu, offset, "ddssd", &fid, |
| 1554 | &afid, &uname, &aname, &n_uname); |
| 1555 | if (err < 0) { |
| 1556 | goto out_nofid; |
| 1557 | } |
| 1558 | trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); |
| 1559 | |
| 1560 | fidp = alloc_fid(s, fid); |
| 1561 | if (fidp == NULL) { |
| 1562 | err = -EINVAL; |
| 1563 | goto out_nofid; |
| 1564 | } |
| 1565 | fidp->uid = n_uname; |
| 1566 | err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); |
| 1567 | if (err < 0) { |
| 1568 | err = -EINVAL; |
| 1569 | clunk_fid(s, fid); |
| 1570 | goto out; |
| 1571 | } |
| 1572 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| 1573 | if (err < 0) { |
| 1574 | err = -EINVAL; |
| 1575 | clunk_fid(s, fid); |
| 1576 | goto out; |
| 1577 | } |
| 1578 | err = stat_to_qid(pdu, &stbuf, &qid); |
| 1579 | if (err < 0) { |
| 1580 | err = -EINVAL; |
| 1581 | clunk_fid(s, fid); |
| 1582 | goto out; |
| 1583 | } |
| 1584 | |
| 1585 | /* |
| 1586 | * disable migration if we haven't done already. |
| 1587 | * attach could get called multiple times for the same export. |
| 1588 | */ |
| 1589 | if (!s->migration_blocker) { |
| 1590 | error_setg(&s->migration_blocker, |
| 1591 | "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", |
| 1592 | s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); |
| 1593 | err = migrate_add_blocker(&s->migration_blocker, NULL); |
| 1594 | if (err < 0) { |
| 1595 | clunk_fid(s, fid); |
| 1596 | goto out; |
| 1597 | } |
| 1598 | s->root_fid = fid; |
| 1599 | } |
| 1600 | |
| 1601 | err = pdu_marshal(pdu, offset, "Q", &qid); |
| 1602 | if (err < 0) { |
| 1603 | clunk_fid(s, fid); |
| 1604 | goto out; |
| 1605 | } |
| 1606 | err += offset; |
| 1607 | |
| 1608 | memcpy(&s->root_st, &stbuf, sizeof(stbuf)); |
| 1609 | trace_v9fs_attach_return(pdu->tag, pdu->id, |
| 1610 | qid.type, qid.version, qid.path); |
| 1611 | out: |
| 1612 | put_fid(pdu, fidp); |
| 1613 | out_nofid: |
| 1614 | pdu_complete(pdu, err); |
| 1615 | v9fs_string_free(&uname); |
| 1616 | v9fs_string_free(&aname); |
| 1617 | } |
| 1618 | |
| 1619 | static void coroutine_fn v9fs_stat(void *opaque) |
| 1620 | { |
| 1621 | int32_t fid; |
| 1622 | V9fsStat v9stat; |
| 1623 | ssize_t err = 0; |
| 1624 | size_t offset = 7; |
| 1625 | struct stat stbuf; |
| 1626 | V9fsFidState *fidp; |
| 1627 | V9fsPDU *pdu = opaque; |
| 1628 | char *basename; |
| 1629 | |
| 1630 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
| 1631 | if (err < 0) { |
| 1632 | goto out_nofid; |
| 1633 | } |
| 1634 | trace_v9fs_stat(pdu->tag, pdu->id, fid); |
| 1635 | |
| 1636 | fidp = get_fid(pdu, fid); |
| 1637 | if (fidp == NULL) { |
| 1638 | err = -ENOENT; |
| 1639 | goto out_nofid; |
| 1640 | } |
| 1641 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| 1642 | if (err < 0) { |
| 1643 | goto out; |
| 1644 | } |
| 1645 | basename = g_path_get_basename(fidp->path.data); |
| 1646 | err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); |
| 1647 | g_free(basename); |
| 1648 | if (err < 0) { |
| 1649 | goto out; |
| 1650 | } |
| 1651 | err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); |
| 1652 | if (err < 0) { |
| 1653 | v9fs_stat_free(&v9stat); |
| 1654 | goto out; |
| 1655 | } |
| 1656 | trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, |
| 1657 | v9stat.atime, v9stat.mtime, v9stat.length); |
| 1658 | err += offset; |
| 1659 | v9fs_stat_free(&v9stat); |
| 1660 | out: |
| 1661 | put_fid(pdu, fidp); |
| 1662 | out_nofid: |
| 1663 | pdu_complete(pdu, err); |
| 1664 | } |
| 1665 | |
| 1666 | static bool fid_has_valid_file_handle(V9fsState *s, V9fsFidState *fidp) |
| 1667 | { |
| 1668 | return s->ops->has_valid_file_handle(fidp->fid_type, &fidp->fs); |
| 1669 | } |
| 1670 | |
| 1671 | static void coroutine_fn v9fs_getattr(void *opaque) |
| 1672 | { |
| 1673 | int32_t fid; |
| 1674 | size_t offset = 7; |
| 1675 | ssize_t retval = 0; |
| 1676 | struct stat stbuf; |
| 1677 | V9fsFidState *fidp; |
| 1678 | uint64_t request_mask; |
| 1679 | V9fsStatDotl v9stat_dotl; |
| 1680 | V9fsPDU *pdu = opaque; |
| 1681 | |
| 1682 | retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); |
| 1683 | if (retval < 0) { |
| 1684 | goto out_nofid; |
| 1685 | } |
| 1686 | trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); |
| 1687 | |
| 1688 | fidp = get_fid(pdu, fid); |
| 1689 | if (fidp == NULL) { |
| 1690 | retval = -ENOENT; |
| 1691 | goto out_nofid; |
| 1692 | } |
| 1693 | if (fid_has_valid_file_handle(pdu->s, fidp)) { |
| 1694 | retval = v9fs_co_fstat(pdu, fidp, &stbuf); |
| 1695 | } else { |
| 1696 | retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| 1697 | } |
| 1698 | if (retval < 0) { |
| 1699 | goto out; |
| 1700 | } |
| 1701 | retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); |
| 1702 | if (retval < 0) { |
| 1703 | goto out; |
| 1704 | } |
| 1705 | |
| 1706 | /* fill st_gen if requested and supported by underlying fs */ |
| 1707 | if (request_mask & P9_STATS_GEN) { |
| 1708 | retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); |
| 1709 | switch (retval) { |
| 1710 | case 0: |
| 1711 | /* we have valid st_gen: update result mask */ |
| 1712 | v9stat_dotl.st_result_mask |= P9_STATS_GEN; |
| 1713 | break; |
| 1714 | case -EINTR: |
| 1715 | /* request cancelled, e.g. by Tflush */ |
| 1716 | goto out; |
| 1717 | default: |
| 1718 | /* failed to get st_gen: not fatal, ignore */ |
| 1719 | break; |
| 1720 | } |
| 1721 | } |
| 1722 | retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); |
| 1723 | if (retval < 0) { |
| 1724 | goto out; |
| 1725 | } |
| 1726 | retval += offset; |
| 1727 | trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, |
| 1728 | v9stat_dotl.st_mode, v9stat_dotl.st_uid, |
| 1729 | v9stat_dotl.st_gid); |
| 1730 | out: |
| 1731 | put_fid(pdu, fidp); |
| 1732 | out_nofid: |
| 1733 | pdu_complete(pdu, retval); |
| 1734 | } |
| 1735 | |
| 1736 | /* Attribute flags */ |
| 1737 | #define P9_ATTR_MODE (1 << 0) |
| 1738 | #define P9_ATTR_UID (1 << 1) |
| 1739 | #define P9_ATTR_GID (1 << 2) |
| 1740 | #define P9_ATTR_SIZE (1 << 3) |
| 1741 | #define P9_ATTR_ATIME (1 << 4) |
| 1742 | #define P9_ATTR_MTIME (1 << 5) |
| 1743 | #define P9_ATTR_CTIME (1 << 6) |
| 1744 | #define P9_ATTR_ATIME_SET (1 << 7) |
| 1745 | #define P9_ATTR_MTIME_SET (1 << 8) |
| 1746 | |
| 1747 | #define P9_ATTR_MASK 127 |
| 1748 | |
| 1749 | static void coroutine_fn v9fs_setattr(void *opaque) |
| 1750 | { |
| 1751 | int err = 0; |
| 1752 | int32_t fid; |
| 1753 | V9fsFidState *fidp; |
| 1754 | size_t offset = 7; |
| 1755 | V9fsIattr v9iattr; |
| 1756 | V9fsPDU *pdu = opaque; |
| 1757 | |
| 1758 | err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); |
| 1759 | if (err < 0) { |
| 1760 | goto out_nofid; |
| 1761 | } |
| 1762 | |
| 1763 | trace_v9fs_setattr(pdu->tag, pdu->id, fid, |
| 1764 | v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, |
| 1765 | v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); |
| 1766 | |
| 1767 | fidp = get_fid(pdu, fid); |
| 1768 | if (fidp == NULL) { |
| 1769 | err = -EINVAL; |
| 1770 | goto out_nofid; |
| 1771 | } |
| 1772 | if (v9iattr.valid & P9_ATTR_MODE) { |
| 1773 | err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); |
| 1774 | if (err < 0) { |
| 1775 | goto out; |
| 1776 | } |
| 1777 | } |
| 1778 | if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { |
| 1779 | struct timespec times[2]; |
| 1780 | if (v9iattr.valid & P9_ATTR_ATIME) { |
| 1781 | if (v9iattr.valid & P9_ATTR_ATIME_SET) { |
| 1782 | times[0].tv_sec = v9iattr.atime_sec; |
| 1783 | times[0].tv_nsec = v9iattr.atime_nsec; |
| 1784 | } else { |
| 1785 | times[0].tv_nsec = UTIME_NOW; |
| 1786 | } |
| 1787 | } else { |
| 1788 | times[0].tv_nsec = UTIME_OMIT; |
| 1789 | } |
| 1790 | if (v9iattr.valid & P9_ATTR_MTIME) { |
| 1791 | if (v9iattr.valid & P9_ATTR_MTIME_SET) { |
| 1792 | times[1].tv_sec = v9iattr.mtime_sec; |
| 1793 | times[1].tv_nsec = v9iattr.mtime_nsec; |
| 1794 | } else { |
| 1795 | times[1].tv_nsec = UTIME_NOW; |
| 1796 | } |
| 1797 | } else { |
| 1798 | times[1].tv_nsec = UTIME_OMIT; |
| 1799 | } |
| 1800 | if (fid_has_valid_file_handle(pdu->s, fidp)) { |
| 1801 | err = v9fs_co_futimens(pdu, fidp, times); |
| 1802 | } else { |
| 1803 | err = v9fs_co_utimensat(pdu, &fidp->path, times); |
| 1804 | } |
| 1805 | if (err < 0) { |
| 1806 | goto out; |
| 1807 | } |
| 1808 | } |
| 1809 | /* |
| 1810 | * If the only valid entry in iattr is ctime we can call |
| 1811 | * chown(-1,-1) to update the ctime of the file |
| 1812 | */ |
| 1813 | if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || |
| 1814 | ((v9iattr.valid & P9_ATTR_CTIME) |
| 1815 | && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { |
| 1816 | if (!(v9iattr.valid & P9_ATTR_UID)) { |
| 1817 | v9iattr.uid = -1; |
| 1818 | } |
| 1819 | if (!(v9iattr.valid & P9_ATTR_GID)) { |
| 1820 | v9iattr.gid = -1; |
| 1821 | } |
| 1822 | err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, |
| 1823 | v9iattr.gid); |
| 1824 | if (err < 0) { |
| 1825 | goto out; |
| 1826 | } |
| 1827 | } |
| 1828 | if (v9iattr.valid & (P9_ATTR_SIZE)) { |
| 1829 | if (fid_has_valid_file_handle(pdu->s, fidp)) { |
| 1830 | err = v9fs_co_ftruncate(pdu, fidp, v9iattr.size); |
| 1831 | } else { |
| 1832 | err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); |
| 1833 | } |
| 1834 | if (err < 0) { |
| 1835 | goto out; |
| 1836 | } |
| 1837 | } |
| 1838 | err = offset; |
| 1839 | trace_v9fs_setattr_return(pdu->tag, pdu->id); |
| 1840 | out: |
| 1841 | put_fid(pdu, fidp); |
| 1842 | out_nofid: |
| 1843 | pdu_complete(pdu, err); |
| 1844 | } |
| 1845 | |
| 1846 | static int coroutine_fn |
| 1847 | v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) |
| 1848 | { |
| 1849 | int i; |
| 1850 | ssize_t err; |
| 1851 | size_t offset = 7; |
| 1852 | |
| 1853 | err = pdu_marshal(pdu, offset, "w", nwnames); |
| 1854 | if (err < 0) { |
| 1855 | return err; |
| 1856 | } |
| 1857 | offset += err; |
| 1858 | for (i = 0; i < nwnames; i++) { |
| 1859 | err = pdu_marshal(pdu, offset, "Q", &qids[i]); |
| 1860 | if (err < 0) { |
| 1861 | return err; |
| 1862 | } |
| 1863 | offset += err; |
| 1864 | } |
| 1865 | return offset; |
| 1866 | } |
| 1867 | |
| 1868 | static bool name_is_illegal(const char *name) |
| 1869 | { |
| 1870 | return !*name || strchr(name, '/') != NULL; |
| 1871 | } |
| 1872 | |
| 1873 | static int check_name(const char *name, V9fsPDU *pdu) |
| 1874 | { |
| 1875 | int request_type = pdu->id; |
| 1876 | |
| 1877 | if (name_is_illegal(name)) { |
| 1878 | return -ENOENT; |
| 1879 | } |
| 1880 | if (!strcmp(name, ".") || !strcmp(name, "..")) { |
| 1881 | /* |
| 1882 | * TODO: The different error codes here are just there to preserve |
| 1883 | * pre-existing behaviour of 9p server. In future it might make sense to |
| 1884 | * consolidate this and e.g. just return -EINVAL for everyone. |
| 1885 | */ |
| 1886 | return (request_type == P9_TRENAME || request_type == P9_TRENAMEAT || |
| 1887 | request_type == P9_TWSTAT) ? -EISDIR : -EEXIST; |
| 1888 | } |
| 1889 | return 0; |
| 1890 | } |
| 1891 | |
| 1892 | static bool same_stat_id(const struct stat *a, const struct stat *b) |
| 1893 | { |
| 1894 | return a->st_dev == b->st_dev && a->st_ino == b->st_ino; |
| 1895 | } |
| 1896 | |
| 1897 | /* |
| 1898 | * Returns a (newly allocated) comma-separated string presentation of the |
| 1899 | * passed array for logging (tracing) purpose for trace event "v9fs_walk". |
| 1900 | * |
| 1901 | * It is caller's responsibility to free the returned string. |
| 1902 | */ |
| 1903 | static char *trace_v9fs_walk_wnames(V9fsString *wnames, size_t nwnames) |
| 1904 | { |
| 1905 | g_autofree char **arr = g_malloc0_n(nwnames + 1, sizeof(char *)); |
| 1906 | for (size_t i = 0; i < nwnames; ++i) { |
| 1907 | arr[i] = wnames[i].data; |
| 1908 | } |
| 1909 | return g_strjoinv(", ", arr); |
| 1910 | } |
| 1911 | |
| 1912 | static void coroutine_fn v9fs_walk(void *opaque) |
| 1913 | { |
| 1914 | int name_idx, nwalked; |
| 1915 | g_autofree V9fsQID *qids = NULL; |
| 1916 | int i, err = 0, any_err = 0; |
| 1917 | V9fsPath dpath, path; |
| 1918 | P9ARRAY_REF(V9fsPath) pathes = NULL; |
| 1919 | uint16_t nwnames; |
| 1920 | struct stat stbuf, fidst; |
| 1921 | g_autofree struct stat *stbufs = NULL; |
| 1922 | size_t offset = 7; |
| 1923 | int32_t fid, newfid; |
| 1924 | P9ARRAY_REF(V9fsString) wnames = NULL; |
| 1925 | g_autofree char *trace_wnames = NULL; |
| 1926 | V9fsFidState *fidp; |
| 1927 | V9fsFidState *newfidp = NULL; |
| 1928 | V9fsPDU *pdu = opaque; |
| 1929 | V9fsState *s = pdu->s; |
| 1930 | V9fsQID qid; |
| 1931 | |
| 1932 | err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); |
| 1933 | if (err < 0) { |
| 1934 | pdu_complete(pdu, err); |
| 1935 | return; |
| 1936 | } |
| 1937 | offset += err; |
| 1938 | |
| 1939 | if (nwnames > P9_MAXWELEM) { |
| 1940 | err = -EINVAL; |
| 1941 | goto out_nofid_nownames; |
| 1942 | } |
| 1943 | if (nwnames) { |
| 1944 | P9ARRAY_NEW(V9fsString, wnames, nwnames); |
| 1945 | qids = g_new0(V9fsQID, nwnames); |
| 1946 | stbufs = g_new0(struct stat, nwnames); |
| 1947 | P9ARRAY_NEW(V9fsPath, pathes, nwnames); |
| 1948 | for (i = 0; i < nwnames; i++) { |
| 1949 | err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); |
| 1950 | if (err < 0) { |
| 1951 | goto out_nofid_nownames; |
| 1952 | } |
| 1953 | if (name_is_illegal(wnames[i].data)) { |
| 1954 | err = -ENOENT; |
| 1955 | goto out_nofid_nownames; |
| 1956 | } |
| 1957 | offset += err; |
| 1958 | } |
| 1959 | if (trace_event_get_state_backends(TRACE_V9FS_WALK)) { |
| 1960 | trace_wnames = trace_v9fs_walk_wnames(wnames, nwnames); |
| 1961 | trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames, |
| 1962 | trace_wnames); |
| 1963 | } |
| 1964 | } else { |
| 1965 | trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames, ""); |
| 1966 | } |
| 1967 | |
| 1968 | fidp = get_fid(pdu, fid); |
| 1969 | if (fidp == NULL) { |
| 1970 | err = -ENOENT; |
| 1971 | goto out_nofid; |
| 1972 | } |
| 1973 | |
| 1974 | v9fs_path_init(&dpath); |
| 1975 | v9fs_path_init(&path); |
| 1976 | /* |
| 1977 | * Both dpath and path initially point to fidp. |
| 1978 | * Needed to handle request with nwnames == 0 |
| 1979 | */ |
| 1980 | v9fs_path_copy(&dpath, &fidp->path); |
| 1981 | v9fs_path_copy(&path, &fidp->path); |
| 1982 | |
| 1983 | /* |
| 1984 | * To keep latency (i.e. overall execution time for processing this |
| 1985 | * Twalk client request) as small as possible, run all the required fs |
| 1986 | * driver code altogether inside the following block. |
| 1987 | */ |
| 1988 | v9fs_co_run_in_worker({ |
| 1989 | nwalked = 0; |
| 1990 | if (v9fs_request_cancelled(pdu)) { |
| 1991 | any_err |= err = -EINTR; |
| 1992 | break; |
| 1993 | } |
| 1994 | err = s->ops->lstat(&s->ctx, &dpath, &fidst); |
| 1995 | if (err < 0) { |
| 1996 | any_err |= err = -errno; |
| 1997 | break; |
| 1998 | } |
| 1999 | stbuf = fidst; |
| 2000 | for (; nwalked < nwnames; nwalked++) { |
| 2001 | if (v9fs_request_cancelled(pdu)) { |
| 2002 | any_err |= err = -EINTR; |
| 2003 | break; |
| 2004 | } |
| 2005 | if (!same_stat_id(&pdu->s->root_st, &stbuf) || |
| 2006 | strcmp("..", wnames[nwalked].data)) |
| 2007 | { |
| 2008 | err = s->ops->name_to_path(&s->ctx, &dpath, |
| 2009 | wnames[nwalked].data, |
| 2010 | &pathes[nwalked]); |
| 2011 | if (err < 0) { |
| 2012 | any_err |= err = -errno; |
| 2013 | break; |
| 2014 | } |
| 2015 | if (v9fs_request_cancelled(pdu)) { |
| 2016 | any_err |= err = -EINTR; |
| 2017 | break; |
| 2018 | } |
| 2019 | err = s->ops->lstat(&s->ctx, &pathes[nwalked], &stbuf); |
| 2020 | if (err < 0) { |
| 2021 | any_err |= err = -errno; |
| 2022 | break; |
| 2023 | } |
| 2024 | stbufs[nwalked] = stbuf; |
| 2025 | v9fs_path_copy(&dpath, &pathes[nwalked]); |
| 2026 | } |
| 2027 | } |
| 2028 | }); |
| 2029 | /* |
| 2030 | * Handle all the rest of this Twalk request on main thread ... |
| 2031 | * |
| 2032 | * NOTE: -EINTR is an exception where we deviate from the protocol spec |
| 2033 | * and simply send a (R)Lerror response instead of bothering to assemble |
| 2034 | * a (deducted) Rwalk response; because -EINTR is always the result of a |
| 2035 | * Tflush request, so client would no longer wait for a response in this |
| 2036 | * case anyway. |
| 2037 | */ |
| 2038 | if ((err < 0 && !nwalked) || err == -EINTR) { |
| 2039 | goto out; |
| 2040 | } |
| 2041 | |
| 2042 | any_err |= err = stat_to_qid(pdu, &fidst, &qid); |
| 2043 | if (err < 0 && !nwalked) { |
| 2044 | goto out; |
| 2045 | } |
| 2046 | stbuf = fidst; |
| 2047 | |
| 2048 | /* reset dpath and path */ |
| 2049 | v9fs_path_copy(&dpath, &fidp->path); |
| 2050 | v9fs_path_copy(&path, &fidp->path); |
| 2051 | |
| 2052 | for (name_idx = 0; name_idx < nwalked; name_idx++) { |
| 2053 | if (!same_stat_id(&pdu->s->root_st, &stbuf) || |
| 2054 | strcmp("..", wnames[name_idx].data)) |
| 2055 | { |
| 2056 | stbuf = stbufs[name_idx]; |
| 2057 | any_err |= err = stat_to_qid(pdu, &stbuf, &qid); |
| 2058 | if (err < 0) { |
| 2059 | break; |
| 2060 | } |
| 2061 | v9fs_path_copy(&path, &pathes[name_idx]); |
| 2062 | v9fs_path_copy(&dpath, &path); |
| 2063 | } |
| 2064 | memcpy(&qids[name_idx], &qid, sizeof(qid)); |
| 2065 | } |
| 2066 | if (any_err < 0) { |
| 2067 | if (!name_idx) { |
| 2068 | /* don't send any QIDs, send Rlerror instead */ |
| 2069 | goto out; |
| 2070 | } else { |
| 2071 | /* send QIDs (not Rlerror), but fid MUST remain unaffected */ |
| 2072 | goto send_qids; |
| 2073 | } |
| 2074 | } |
| 2075 | if (fid == newfid) { |
| 2076 | if (fidp->fid_type != P9_FID_NONE) { |
| 2077 | err = -EINVAL; |
| 2078 | goto out; |
| 2079 | } |
| 2080 | v9fs_path_write_lock(s); |
| 2081 | v9fs_path_copy(&fidp->path, &path); |
| 2082 | v9fs_path_unlock(s); |
| 2083 | } else { |
| 2084 | newfidp = alloc_fid(s, newfid); |
| 2085 | if (newfidp == NULL) { |
| 2086 | err = -EINVAL; |
| 2087 | goto out; |
| 2088 | } |
| 2089 | newfidp->uid = fidp->uid; |
| 2090 | v9fs_path_copy(&newfidp->path, &path); |
| 2091 | } |
| 2092 | send_qids: |
| 2093 | err = v9fs_walk_marshal(pdu, name_idx, qids); |
| 2094 | trace_v9fs_walk_return(pdu->tag, pdu->id, name_idx, qids); |
| 2095 | out: |
| 2096 | put_fid(pdu, fidp); |
| 2097 | if (newfidp) { |
| 2098 | put_fid(pdu, newfidp); |
| 2099 | } |
| 2100 | v9fs_path_free(&dpath); |
| 2101 | v9fs_path_free(&path); |
| 2102 | goto out_pdu_complete; |
| 2103 | out_nofid_nownames: |
| 2104 | trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames, "<?>"); |
| 2105 | out_nofid: |
| 2106 | out_pdu_complete: |
| 2107 | pdu_complete(pdu, err); |
| 2108 | } |
| 2109 | |
| 2110 | static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) |
| 2111 | { |
| 2112 | struct statfs stbuf; |
| 2113 | int err = v9fs_co_statfs(pdu, path, &stbuf); |
| 2114 | |
| 2115 | return blksize_to_iounit(pdu, (err >= 0) ? stbuf.f_bsize : 0); |
| 2116 | } |
| 2117 | |
| 2118 | static void coroutine_fn v9fs_open(void *opaque) |
| 2119 | { |
| 2120 | int flags; |
| 2121 | int32_t fid; |
| 2122 | int32_t mode; |
| 2123 | V9fsQID qid; |
| 2124 | int iounit = 0; |
| 2125 | ssize_t err = 0; |
| 2126 | size_t offset = 7; |
| 2127 | struct stat stbuf; |
| 2128 | V9fsFidState *fidp; |
| 2129 | V9fsPDU *pdu = opaque; |
| 2130 | V9fsState *s = pdu->s; |
| 2131 | g_autofree char *trace_oflags = NULL; |
| 2132 | |
| 2133 | if (s->proto_version == V9FS_PROTO_2000L) { |
| 2134 | err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); |
| 2135 | } else { |
| 2136 | uint8_t modebyte; |
| 2137 | err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); |
| 2138 | mode = modebyte; |
| 2139 | } |
| 2140 | if (err < 0) { |
| 2141 | goto out_nofid; |
| 2142 | } |
| 2143 | if (trace_event_get_state_backends(TRACE_V9FS_OPEN)) { |
| 2144 | trace_oflags = qemu_open_flags_tostr( |
| 2145 | (s->proto_version == V9FS_PROTO_2000L) ? |
| 2146 | dotl_to_open_flags(mode) : omode_to_uflags(mode) |
| 2147 | ); |
| 2148 | trace_v9fs_open(pdu->tag, pdu->id, fid, mode, trace_oflags); |
| 2149 | } |
| 2150 | |
| 2151 | fidp = get_fid(pdu, fid); |
| 2152 | if (fidp == NULL) { |
| 2153 | err = -ENOENT; |
| 2154 | goto out_nofid; |
| 2155 | } |
| 2156 | if (fidp->fid_type != P9_FID_NONE) { |
| 2157 | err = -EINVAL; |
| 2158 | goto out; |
| 2159 | } |
| 2160 | |
| 2161 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| 2162 | if (err < 0) { |
| 2163 | goto out; |
| 2164 | } |
| 2165 | err = stat_to_qid(pdu, &stbuf, &qid); |
| 2166 | if (err < 0) { |
| 2167 | goto out; |
| 2168 | } |
| 2169 | if (S_ISDIR(stbuf.st_mode)) { |
| 2170 | err = v9fs_co_opendir(pdu, fidp); |
| 2171 | if (err < 0) { |
| 2172 | goto out; |
| 2173 | } |
| 2174 | fidp->fid_type = P9_FID_DIR; |
| 2175 | err = pdu_marshal(pdu, offset, "Qd", &qid, 0); |
| 2176 | if (err < 0) { |
| 2177 | goto out; |
| 2178 | } |
| 2179 | err += offset; |
| 2180 | } else { |
| 2181 | if (s->proto_version == V9FS_PROTO_2000L) { |
| 2182 | flags = get_dotl_openflags(s, mode); |
| 2183 | } else { |
| 2184 | flags = omode_to_uflags(mode); |
| 2185 | } |
| 2186 | if (is_ro_export(&s->ctx)) { |
| 2187 | if (flags & O_WRONLY || flags & O_RDWR || |
| 2188 | flags & O_APPEND || flags & O_TRUNC) { |
| 2189 | err = -EROFS; |
| 2190 | goto out; |
| 2191 | } |
| 2192 | } |
| 2193 | err = v9fs_co_open(pdu, fidp, flags); |
| 2194 | if (err < 0) { |
| 2195 | goto out; |
| 2196 | } |
| 2197 | fidp->fid_type = P9_FID_FILE; |
| 2198 | fidp->open_flags = flags; |
| 2199 | if (flags & O_EXCL) { |
| 2200 | /* |
| 2201 | * We let the host file system do O_EXCL check |
| 2202 | * We should not reclaim such fd |
| 2203 | */ |
| 2204 | fidp->flags |= FID_NON_RECLAIMABLE; |
| 2205 | } |
| 2206 | iounit = get_iounit(pdu, &fidp->path); |
| 2207 | err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
| 2208 | if (err < 0) { |
| 2209 | goto out; |
| 2210 | } |
| 2211 | err += offset; |
| 2212 | } |
| 2213 | trace_v9fs_open_return(pdu->tag, pdu->id, |
| 2214 | qid.type, qid.version, qid.path, iounit); |
| 2215 | out: |
| 2216 | put_fid(pdu, fidp); |
| 2217 | out_nofid: |
| 2218 | pdu_complete(pdu, err); |
| 2219 | } |
| 2220 | |
| 2221 | static void coroutine_fn v9fs_lcreate(void *opaque) |
| 2222 | { |
| 2223 | int32_t dfid, flags, mode; |
| 2224 | gid_t gid; |
| 2225 | ssize_t err = 0; |
| 2226 | ssize_t offset = 7; |
| 2227 | V9fsString name; |
| 2228 | V9fsFidState *fidp; |
| 2229 | struct stat stbuf; |
| 2230 | V9fsQID qid; |
| 2231 | int32_t iounit; |
| 2232 | V9fsPDU *pdu = opaque; |
| 2233 | |
| 2234 | v9fs_string_init(&name); |
| 2235 | err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, |
| 2236 | &name, &flags, &mode, &gid); |
| 2237 | if (err < 0) { |
| 2238 | goto out_nofid; |
| 2239 | } |
| 2240 | trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); |
| 2241 | |
| 2242 | err = check_name(name.data, pdu); |
| 2243 | if (err < 0) { |
| 2244 | goto out_nofid; |
| 2245 | } |
| 2246 | |
| 2247 | fidp = get_fid(pdu, dfid); |
| 2248 | if (fidp == NULL) { |
| 2249 | err = -ENOENT; |
| 2250 | goto out_nofid; |
| 2251 | } |
| 2252 | if (fidp->fid_type != P9_FID_NONE) { |
| 2253 | err = -EINVAL; |
| 2254 | goto out; |
| 2255 | } |
| 2256 | |
| 2257 | flags = get_dotl_openflags(pdu->s, flags); |
| 2258 | err = v9fs_co_open2(pdu, fidp, &name, gid, |
| 2259 | flags | O_CREAT, mode, &stbuf); |
| 2260 | if (err < 0) { |
| 2261 | goto out; |
| 2262 | } |
| 2263 | fidp->fid_type = P9_FID_FILE; |
| 2264 | fidp->open_flags = flags; |
| 2265 | if (flags & O_EXCL) { |
| 2266 | /* |
| 2267 | * We let the host file system do O_EXCL check |
| 2268 | * We should not reclaim such fd |
| 2269 | */ |
| 2270 | fidp->flags |= FID_NON_RECLAIMABLE; |
| 2271 | } |
| 2272 | iounit = get_iounit(pdu, &fidp->path); |
| 2273 | err = stat_to_qid(pdu, &stbuf, &qid); |
| 2274 | if (err < 0) { |
| 2275 | goto out; |
| 2276 | } |
| 2277 | err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
| 2278 | if (err < 0) { |
| 2279 | goto out; |
| 2280 | } |
| 2281 | err += offset; |
| 2282 | trace_v9fs_lcreate_return(pdu->tag, pdu->id, |
| 2283 | qid.type, qid.version, qid.path, iounit); |
| 2284 | out: |
| 2285 | put_fid(pdu, fidp); |
| 2286 | out_nofid: |
| 2287 | pdu_complete(pdu, err); |
| 2288 | v9fs_string_free(&name); |
| 2289 | } |
| 2290 | |
| 2291 | static void coroutine_fn v9fs_fsync(void *opaque) |
| 2292 | { |
| 2293 | int err; |
| 2294 | int32_t fid; |
| 2295 | int datasync; |
| 2296 | size_t offset = 7; |
| 2297 | V9fsFidState *fidp; |
| 2298 | V9fsPDU *pdu = opaque; |
| 2299 | |
| 2300 | err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); |
| 2301 | if (err < 0) { |
| 2302 | goto out_nofid; |
| 2303 | } |
| 2304 | trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); |
| 2305 | |
| 2306 | fidp = get_fid(pdu, fid); |
| 2307 | if (fidp == NULL) { |
| 2308 | err = -ENOENT; |
| 2309 | goto out_nofid; |
| 2310 | } |
| 2311 | if (!fid_has_valid_file_handle(pdu->s, fidp)) { |
| 2312 | err = -EBADF; |
| 2313 | goto out; |
| 2314 | } |
| 2315 | err = v9fs_co_fsync(pdu, fidp, datasync); |
| 2316 | if (!err) { |
| 2317 | err = offset; |
| 2318 | } |
| 2319 | out: |
| 2320 | put_fid(pdu, fidp); |
| 2321 | out_nofid: |
| 2322 | pdu_complete(pdu, err); |
| 2323 | } |
| 2324 | |
| 2325 | static void coroutine_fn v9fs_clunk(void *opaque) |
| 2326 | { |
| 2327 | int err; |
| 2328 | int32_t fid; |
| 2329 | size_t offset = 7; |
| 2330 | V9fsFidState *fidp; |
| 2331 | V9fsPDU *pdu = opaque; |
| 2332 | V9fsState *s = pdu->s; |
| 2333 | |
| 2334 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
| 2335 | if (err < 0) { |
| 2336 | goto out_nofid; |
| 2337 | } |
| 2338 | trace_v9fs_clunk(pdu->tag, pdu->id, fid); |
| 2339 | |
| 2340 | fidp = clunk_fid(s, fid); |
| 2341 | if (fidp == NULL) { |
| 2342 | err = -ENOENT; |
| 2343 | goto out_nofid; |
| 2344 | } |
| 2345 | /* |
| 2346 | * Bump the ref so that put_fid will |
| 2347 | * free the fid. |
| 2348 | */ |
| 2349 | fidp->ref++; |
| 2350 | err = put_fid(pdu, fidp); |
| 2351 | if (!err) { |
| 2352 | err = offset; |
| 2353 | } |
| 2354 | out_nofid: |
| 2355 | pdu_complete(pdu, err); |
| 2356 | } |
| 2357 | |
| 2358 | /* |
| 2359 | * Create a QEMUIOVector for a sub-region of PDU iovecs |
| 2360 | * |
| 2361 | * @qiov: uninitialized QEMUIOVector |
| 2362 | * @skip: number of bytes to skip from beginning of PDU |
| 2363 | * @size: number of bytes to include |
| 2364 | * @is_write: true - write, false - read |
| 2365 | * |
| 2366 | * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up |
| 2367 | * with qemu_iovec_destroy(). |
| 2368 | */ |
| 2369 | static void coroutine_fn |
| 2370 | v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, |
| 2371 | size_t skip, size_t size, |
| 2372 | bool is_write) |
| 2373 | { |
| 2374 | QEMUIOVector elem; |
| 2375 | struct iovec *iov; |
| 2376 | unsigned int niov; |
| 2377 | |
| 2378 | if (is_write) { |
| 2379 | pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); |
| 2380 | } else { |
| 2381 | pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); |
| 2382 | } |
| 2383 | |
| 2384 | qemu_iovec_init_external(&elem, iov, niov); |
| 2385 | qemu_iovec_init(qiov, niov); |
| 2386 | qemu_iovec_concat(qiov, &elem, skip, size); |
| 2387 | } |
| 2388 | |
| 2389 | static int coroutine_fn |
| 2390 | v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, |
| 2391 | uint64_t off, uint32_t max_count) |
| 2392 | { |
| 2393 | ssize_t err; |
| 2394 | size_t offset = 7; |
| 2395 | uint64_t read_count; |
| 2396 | QEMUIOVector qiov_full; |
| 2397 | |
| 2398 | if (fidp->fs.xattr.len < off) { |
| 2399 | read_count = 0; |
| 2400 | } else { |
| 2401 | read_count = fidp->fs.xattr.len - off; |
| 2402 | } |
| 2403 | if (read_count > max_count) { |
| 2404 | read_count = max_count; |
| 2405 | } |
| 2406 | err = pdu_marshal(pdu, offset, "d", read_count); |
| 2407 | if (err < 0) { |
| 2408 | return err; |
| 2409 | } |
| 2410 | offset += err; |
| 2411 | |
| 2412 | v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); |
| 2413 | err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, |
| 2414 | ((char *)fidp->fs.xattr.value) + off, |
| 2415 | read_count); |
| 2416 | qemu_iovec_destroy(&qiov_full); |
| 2417 | if (err < 0) { |
| 2418 | return err; |
| 2419 | } |
| 2420 | offset += err; |
| 2421 | return offset; |
| 2422 | } |
| 2423 | |
| 2424 | static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, |
| 2425 | V9fsFidState *fidp, |
| 2426 | uint32_t max_count) |
| 2427 | { |
| 2428 | V9fsPath path; |
| 2429 | V9fsStat v9stat; |
| 2430 | int len, err = 0; |
| 2431 | int32_t count = 0; |
| 2432 | struct stat stbuf; |
| 2433 | off_t saved_dir_pos; |
| 2434 | struct dirent *dent; |
| 2435 | |
| 2436 | /* save the directory position */ |
| 2437 | saved_dir_pos = v9fs_co_telldir(pdu, fidp); |
| 2438 | if (saved_dir_pos < 0) { |
| 2439 | return saved_dir_pos; |
| 2440 | } |
| 2441 | |
| 2442 | while (1) { |
| 2443 | v9fs_path_init(&path); |
| 2444 | |
| 2445 | v9fs_readdir_lock(&fidp->fs.dir); |
| 2446 | |
| 2447 | err = v9fs_co_readdir(pdu, fidp, &dent); |
| 2448 | if (err || !dent) { |
| 2449 | break; |
| 2450 | } |
| 2451 | err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); |
| 2452 | if (err < 0) { |
| 2453 | break; |
| 2454 | } |
| 2455 | err = v9fs_co_lstat(pdu, &path, &stbuf); |
| 2456 | if (err < 0) { |
| 2457 | break; |
| 2458 | } |
| 2459 | err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); |
| 2460 | if (err < 0) { |
| 2461 | break; |
| 2462 | } |
| 2463 | if ((count + v9stat.size + 2) > max_count) { |
| 2464 | v9fs_readdir_unlock(&fidp->fs.dir); |
| 2465 | |
| 2466 | /* Ran out of buffer. Set dir back to old position and return */ |
| 2467 | v9fs_co_seekdir(pdu, fidp, saved_dir_pos); |
| 2468 | v9fs_stat_free(&v9stat); |
| 2469 | v9fs_path_free(&path); |
| 2470 | return count; |
| 2471 | } |
| 2472 | |
| 2473 | /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ |
| 2474 | len = pdu_marshal(pdu, 11 + count, "S", &v9stat); |
| 2475 | |
| 2476 | v9fs_readdir_unlock(&fidp->fs.dir); |
| 2477 | |
| 2478 | if (len < 0) { |
| 2479 | v9fs_co_seekdir(pdu, fidp, saved_dir_pos); |
| 2480 | v9fs_stat_free(&v9stat); |
| 2481 | v9fs_path_free(&path); |
| 2482 | return len; |
| 2483 | } |
| 2484 | count += len; |
| 2485 | v9fs_stat_free(&v9stat); |
| 2486 | v9fs_path_free(&path); |
| 2487 | saved_dir_pos = qemu_dirent_off(dent); |
| 2488 | } |
| 2489 | |
| 2490 | v9fs_readdir_unlock(&fidp->fs.dir); |
| 2491 | |
| 2492 | v9fs_path_free(&path); |
| 2493 | if (err < 0) { |
| 2494 | return err; |
| 2495 | } |
| 2496 | return count; |
| 2497 | } |
| 2498 | |
| 2499 | static void coroutine_fn v9fs_read(void *opaque) |
| 2500 | { |
| 2501 | int32_t fid; |
| 2502 | uint64_t off; |
| 2503 | ssize_t err = 0; |
| 2504 | int32_t count = 0; |
| 2505 | size_t offset = 7; |
| 2506 | uint32_t max_count; |
| 2507 | V9fsFidState *fidp; |
| 2508 | V9fsPDU *pdu = opaque; |
| 2509 | V9fsState *s = pdu->s; |
| 2510 | |
| 2511 | err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); |
| 2512 | if (err < 0) { |
| 2513 | goto out_nofid; |
| 2514 | } |
| 2515 | trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); |
| 2516 | |
| 2517 | fidp = get_fid(pdu, fid); |
| 2518 | if (fidp == NULL) { |
| 2519 | err = -EINVAL; |
| 2520 | goto out_nofid; |
| 2521 | } |
| 2522 | if (fidp->fid_type == P9_FID_DIR) { |
| 2523 | if (s->proto_version != V9FS_PROTO_2000U) { |
| 2524 | warn_report_once( |
| 2525 | "9p: bad client: T_read request on directory only expected " |
| 2526 | "with 9P2000.u protocol version" |
| 2527 | ); |
| 2528 | err = -EOPNOTSUPP; |
| 2529 | goto out; |
| 2530 | } |
| 2531 | if (off == 0) { |
| 2532 | v9fs_co_rewinddir(pdu, fidp); |
| 2533 | } |
| 2534 | count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); |
| 2535 | if (count < 0) { |
| 2536 | err = count; |
| 2537 | goto out; |
| 2538 | } |
| 2539 | err = pdu_marshal(pdu, offset, "d", count); |
| 2540 | if (err < 0) { |
| 2541 | goto out; |
| 2542 | } |
| 2543 | err += offset + count; |
| 2544 | } else if (fidp->fid_type == P9_FID_FILE) { |
| 2545 | QEMUIOVector qiov_full; |
| 2546 | QEMUIOVector qiov; |
| 2547 | int32_t len; |
| 2548 | |
| 2549 | v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); |
| 2550 | qemu_iovec_init(&qiov, qiov_full.niov); |
| 2551 | do { |
| 2552 | qemu_iovec_reset(&qiov); |
| 2553 | qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); |
| 2554 | if (0) { |
| 2555 | print_sg(qiov.iov, qiov.niov); |
| 2556 | } |
| 2557 | /* Loop in case of EINTR */ |
| 2558 | do { |
| 2559 | len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); |
| 2560 | if (len >= 0) { |
| 2561 | off += len; |
| 2562 | count += len; |
| 2563 | } |
| 2564 | } while (len == -EINTR && !pdu->cancelled); |
| 2565 | if (len < 0) { |
| 2566 | /* IO error return the error */ |
| 2567 | err = len; |
| 2568 | goto out_free_iovec; |
| 2569 | } |
| 2570 | } while (count < max_count && len > 0); |
| 2571 | err = pdu_marshal(pdu, offset, "d", count); |
| 2572 | if (err < 0) { |
| 2573 | goto out_free_iovec; |
| 2574 | } |
| 2575 | err += offset + count; |
| 2576 | out_free_iovec: |
| 2577 | qemu_iovec_destroy(&qiov); |
| 2578 | qemu_iovec_destroy(&qiov_full); |
| 2579 | } else if (fidp->fid_type == P9_FID_XATTR) { |
| 2580 | err = v9fs_xattr_read(s, pdu, fidp, off, max_count); |
| 2581 | } else { |
| 2582 | err = -EINVAL; |
| 2583 | } |
| 2584 | trace_v9fs_read_return(pdu->tag, pdu->id, count, err); |
| 2585 | out: |
| 2586 | put_fid(pdu, fidp); |
| 2587 | out_nofid: |
| 2588 | pdu_complete(pdu, err); |
| 2589 | } |
| 2590 | |
| 2591 | /** |
| 2592 | * v9fs_readdir_response_size() - Returns size required in Rreaddir response |
| 2593 | * for the passed dirent @name. |
| 2594 | * |
| 2595 | * @name: directory entry's name (i.e. file name, directory name) |
| 2596 | * Return: required size in bytes |
| 2597 | */ |
| 2598 | size_t v9fs_readdir_response_size(V9fsString *name) |
| 2599 | { |
| 2600 | /* |
| 2601 | * Size of each dirent on the wire: size of qid (13) + size of offset (8) |
| 2602 | * size of type (1) + size of name.size (2) + strlen(name.data) |
| 2603 | */ |
| 2604 | return 24 + v9fs_string_size(name); |
| 2605 | } |
| 2606 | |
| 2607 | static void v9fs_free_dirents(struct V9fsDirEnt *e) |
| 2608 | { |
| 2609 | struct V9fsDirEnt *next = NULL; |
| 2610 | |
| 2611 | for (; e; e = next) { |
| 2612 | next = e->next; |
| 2613 | g_free(e->dent); |
| 2614 | g_free(e->st); |
| 2615 | g_free(e); |
| 2616 | } |
| 2617 | } |
| 2618 | |
| 2619 | static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, |
| 2620 | off_t offset, int32_t max_count) |
| 2621 | { |
| 2622 | size_t size; |
| 2623 | V9fsQID qid; |
| 2624 | V9fsString name; |
| 2625 | int len, err = 0; |
| 2626 | int32_t count = 0; |
| 2627 | off_t off; |
| 2628 | struct dirent *dent; |
| 2629 | struct stat *st; |
| 2630 | struct V9fsDirEnt *entries = NULL; |
| 2631 | |
| 2632 | /* |
| 2633 | * inode remapping requires the device id, which in turn might be |
| 2634 | * different for different directory entries, so if inode remapping is |
| 2635 | * enabled we have to make a full stat for each directory entry |
| 2636 | */ |
| 2637 | const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; |
| 2638 | |
| 2639 | /* |
| 2640 | * Fetch all required directory entries altogether on a background IO |
| 2641 | * thread from fs driver. We don't want to do that for each entry |
| 2642 | * individually, because hopping between threads (this main IO thread |
| 2643 | * and background IO driver thread) would sum up to huge latencies. |
| 2644 | */ |
| 2645 | count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, |
| 2646 | dostat); |
| 2647 | if (count < 0) { |
| 2648 | err = count; |
| 2649 | count = 0; |
| 2650 | goto out; |
| 2651 | } |
| 2652 | count = 0; |
| 2653 | |
| 2654 | for (struct V9fsDirEnt *e = entries; e; e = e->next) { |
| 2655 | dent = e->dent; |
| 2656 | |
| 2657 | if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { |
| 2658 | st = e->st; |
| 2659 | /* e->st should never be NULL, but just to be sure */ |
| 2660 | if (!st) { |
| 2661 | err = -1; |
| 2662 | break; |
| 2663 | } |
| 2664 | |
| 2665 | /* remap inode */ |
| 2666 | err = stat_to_qid(pdu, st, &qid); |
| 2667 | if (err < 0) { |
| 2668 | break; |
| 2669 | } |
| 2670 | } else { |
| 2671 | /* |
| 2672 | * Fill up just the path field of qid because the client uses |
| 2673 | * only that. To fill the entire qid structure we will have |
| 2674 | * to stat each dirent found, which is expensive. For the |
| 2675 | * latter reason we don't call stat_to_qid() here. Only drawback |
| 2676 | * is that no multi-device export detection of stat_to_qid() |
| 2677 | * would be done and provided as error to the user here. But |
| 2678 | * user would get that error anyway when accessing those |
| 2679 | * files/dirs through other ways. |
| 2680 | */ |
| 2681 | size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); |
| 2682 | memcpy(&qid.path, &dent->d_ino, size); |
| 2683 | /* Fill the other fields with dummy values */ |
| 2684 | qid.type = 0; |
| 2685 | qid.version = 0; |
| 2686 | } |
| 2687 | |
| 2688 | off = qemu_dirent_off(dent); |
| 2689 | v9fs_string_init(&name); |
| 2690 | v9fs_string_sprintf(&name, "%s", dent->d_name); |
| 2691 | |
| 2692 | /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ |
| 2693 | len = pdu_marshal(pdu, 11 + count, "Qqbs", |
| 2694 | &qid, off, |
| 2695 | dent->d_type, &name); |
| 2696 | |
| 2697 | v9fs_string_free(&name); |
| 2698 | |
| 2699 | if (len < 0) { |
| 2700 | err = len; |
| 2701 | break; |
| 2702 | } |
| 2703 | |
| 2704 | count += len; |
| 2705 | } |
| 2706 | |
| 2707 | out: |
| 2708 | v9fs_free_dirents(entries); |
| 2709 | if (err < 0) { |
| 2710 | return err; |
| 2711 | } |
| 2712 | return count; |
| 2713 | } |
| 2714 | |
| 2715 | static void coroutine_fn v9fs_readdir(void *opaque) |
| 2716 | { |
| 2717 | int32_t fid; |
| 2718 | V9fsFidState *fidp; |
| 2719 | ssize_t retval = 0; |
| 2720 | size_t offset = 7; |
| 2721 | uint64_t initial_offset; |
| 2722 | int32_t count; |
| 2723 | uint32_t max_count; |
| 2724 | V9fsPDU *pdu = opaque; |
| 2725 | V9fsState *s = pdu->s; |
| 2726 | size_t max_resp_sz; |
| 2727 | |
| 2728 | retval = pdu_unmarshal(pdu, offset, "dqd", &fid, |
| 2729 | &initial_offset, &max_count); |
| 2730 | if (retval < 0) { |
| 2731 | goto out_nofid; |
| 2732 | } |
| 2733 | trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); |
| 2734 | |
| 2735 | max_resp_sz = s->msize; |
| 2736 | |
| 2737 | /* |
| 2738 | * Constrain max_count to transport's current, actual response buffer size. |
| 2739 | * A bad client might provide a response buffer < msize. |
| 2740 | */ |
| 2741 | if (s->transport->response_buffer_size) { |
| 2742 | size_t buf_size = s->transport->response_buffer_size(pdu); |
| 2743 | if (max_resp_sz > buf_size) { |
| 2744 | max_resp_sz = buf_size; |
| 2745 | } |
| 2746 | } |
| 2747 | |
| 2748 | /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ |
| 2749 | if (max_resp_sz > 11) { |
| 2750 | max_resp_sz -= 11; |
| 2751 | } else { |
| 2752 | max_resp_sz = 0; |
| 2753 | } |
| 2754 | |
| 2755 | if (max_count > max_resp_sz) { |
| 2756 | max_count = max_resp_sz; |
| 2757 | warn_report_once( |
| 2758 | "9p: bad client: T_readdir with count > msize - 11" |
| 2759 | ); |
| 2760 | } |
| 2761 | |
| 2762 | fidp = get_fid(pdu, fid); |
| 2763 | if (fidp == NULL) { |
| 2764 | retval = -EINVAL; |
| 2765 | goto out_nofid; |
| 2766 | } |
| 2767 | if (fidp->fid_type != P9_FID_DIR) { |
| 2768 | warn_report_once("9p: bad client: T_readdir on non-directory stream"); |
| 2769 | retval = -ENOTDIR; |
| 2770 | goto out; |
| 2771 | } |
| 2772 | if (!fidp->fs.dir.stream) { |
| 2773 | retval = -EINVAL; |
| 2774 | goto out; |
| 2775 | } |
| 2776 | if (s->proto_version != V9FS_PROTO_2000L) { |
| 2777 | warn_report_once( |
| 2778 | "9p: bad client: T_readdir request only expected with 9P2000.L " |
| 2779 | "protocol version" |
| 2780 | ); |
| 2781 | retval = -EOPNOTSUPP; |
| 2782 | goto out; |
| 2783 | } |
| 2784 | count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); |
| 2785 | if (count < 0) { |
| 2786 | retval = count; |
| 2787 | goto out; |
| 2788 | } |
| 2789 | retval = pdu_marshal(pdu, offset, "d", count); |
| 2790 | if (retval < 0) { |
| 2791 | goto out; |
| 2792 | } |
| 2793 | retval += count + offset; |
| 2794 | trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); |
| 2795 | out: |
| 2796 | put_fid(pdu, fidp); |
| 2797 | out_nofid: |
| 2798 | pdu_complete(pdu, retval); |
| 2799 | } |
| 2800 | |
| 2801 | static int coroutine_fn |
| 2802 | v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, |
| 2803 | uint64_t off, uint32_t count, |
| 2804 | struct iovec *sg, int cnt) |
| 2805 | { |
| 2806 | int i, to_copy; |
| 2807 | ssize_t err = 0; |
| 2808 | uint64_t write_count; |
| 2809 | size_t offset = 7; |
| 2810 | |
| 2811 | |
| 2812 | if (fidp->fs.xattr.len < off) { |
| 2813 | return -ENOSPC; |
| 2814 | } |
| 2815 | write_count = fidp->fs.xattr.len - off; |
| 2816 | if (write_count > count) { |
| 2817 | write_count = count; |
| 2818 | } |
| 2819 | err = pdu_marshal(pdu, offset, "d", write_count); |
| 2820 | if (err < 0) { |
| 2821 | return err; |
| 2822 | } |
| 2823 | err += offset; |
| 2824 | fidp->fs.xattr.copied_len += write_count; |
| 2825 | /* |
| 2826 | * Now copy the content from sg list |
| 2827 | */ |
| 2828 | for (i = 0; i < cnt; i++) { |
| 2829 | if (write_count > sg[i].iov_len) { |
| 2830 | to_copy = sg[i].iov_len; |
| 2831 | } else { |
| 2832 | to_copy = write_count; |
| 2833 | } |
| 2834 | memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); |
| 2835 | /* updating vs->off since we are not using below */ |
| 2836 | off += to_copy; |
| 2837 | write_count -= to_copy; |
| 2838 | } |
| 2839 | |
| 2840 | return err; |
| 2841 | } |
| 2842 | |
| 2843 | static void coroutine_fn v9fs_write(void *opaque) |
| 2844 | { |
| 2845 | ssize_t err; |
| 2846 | int32_t fid; |
| 2847 | uint64_t off; |
| 2848 | uint32_t count; |
| 2849 | int32_t len = 0; |
| 2850 | int32_t total = 0; |
| 2851 | size_t offset = 7; |
| 2852 | V9fsFidState *fidp; |
| 2853 | V9fsPDU *pdu = opaque; |
| 2854 | V9fsState *s = pdu->s; |
| 2855 | QEMUIOVector qiov_full; |
| 2856 | QEMUIOVector qiov; |
| 2857 | |
| 2858 | err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); |
| 2859 | if (err < 0) { |
| 2860 | pdu_complete(pdu, err); |
| 2861 | return; |
| 2862 | } |
| 2863 | offset += err; |
| 2864 | v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); |
| 2865 | trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); |
| 2866 | |
| 2867 | fidp = get_fid(pdu, fid); |
| 2868 | if (fidp == NULL) { |
| 2869 | err = -EINVAL; |
| 2870 | goto out_nofid; |
| 2871 | } |
| 2872 | if (fidp->fid_type == P9_FID_FILE) { |
| 2873 | if (fidp->fs.fd == -1) { |
| 2874 | err = -EINVAL; |
| 2875 | goto out; |
| 2876 | } |
| 2877 | } else if (fidp->fid_type == P9_FID_XATTR) { |
| 2878 | /* |
| 2879 | * setxattr operation |
| 2880 | */ |
| 2881 | err = v9fs_xattr_write(s, pdu, fidp, off, count, |
| 2882 | qiov_full.iov, qiov_full.niov); |
| 2883 | goto out; |
| 2884 | } else { |
| 2885 | err = -EINVAL; |
| 2886 | goto out; |
| 2887 | } |
| 2888 | qemu_iovec_init(&qiov, qiov_full.niov); |
| 2889 | do { |
| 2890 | qemu_iovec_reset(&qiov); |
| 2891 | qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); |
| 2892 | if (0) { |
| 2893 | print_sg(qiov.iov, qiov.niov); |
| 2894 | } |
| 2895 | /* Loop in case of EINTR */ |
| 2896 | do { |
| 2897 | len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); |
| 2898 | if (len >= 0) { |
| 2899 | off += len; |
| 2900 | total += len; |
| 2901 | } |
| 2902 | } while (len == -EINTR && !pdu->cancelled); |
| 2903 | if (len < 0) { |
| 2904 | /* IO error return the error */ |
| 2905 | err = len; |
| 2906 | goto out_qiov; |
| 2907 | } |
| 2908 | } while (total < count && len > 0); |
| 2909 | |
| 2910 | offset = 7; |
| 2911 | err = pdu_marshal(pdu, offset, "d", total); |
| 2912 | if (err < 0) { |
| 2913 | goto out_qiov; |
| 2914 | } |
| 2915 | err += offset; |
| 2916 | trace_v9fs_write_return(pdu->tag, pdu->id, total, err); |
| 2917 | out_qiov: |
| 2918 | qemu_iovec_destroy(&qiov); |
| 2919 | out: |
| 2920 | put_fid(pdu, fidp); |
| 2921 | out_nofid: |
| 2922 | qemu_iovec_destroy(&qiov_full); |
| 2923 | pdu_complete(pdu, err); |
| 2924 | } |
| 2925 | |
| 2926 | static void coroutine_fn v9fs_create(void *opaque) |
| 2927 | { |
| 2928 | int32_t fid; |
| 2929 | int err = 0; |
| 2930 | size_t offset = 7; |
| 2931 | V9fsFidState *fidp; |
| 2932 | V9fsQID qid; |
| 2933 | int32_t perm; |
| 2934 | int8_t mode; |
| 2935 | V9fsPath path; |
| 2936 | struct stat stbuf; |
| 2937 | V9fsString name; |
| 2938 | V9fsString extension; |
| 2939 | int iounit; |
| 2940 | V9fsPDU *pdu = opaque; |
| 2941 | V9fsState *s = pdu->s; |
| 2942 | |
| 2943 | v9fs_path_init(&path); |
| 2944 | v9fs_string_init(&name); |
| 2945 | v9fs_string_init(&extension); |
| 2946 | err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, |
| 2947 | &perm, &mode, &extension); |
| 2948 | if (err < 0) { |
| 2949 | goto out_nofid; |
| 2950 | } |
| 2951 | trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); |
| 2952 | |
| 2953 | err = check_name(name.data, pdu); |
| 2954 | if (err < 0) { |
| 2955 | goto out_nofid; |
| 2956 | } |
| 2957 | |
| 2958 | fidp = get_fid(pdu, fid); |
| 2959 | if (fidp == NULL) { |
| 2960 | err = -EINVAL; |
| 2961 | goto out_nofid; |
| 2962 | } |
| 2963 | if (fidp->fid_type != P9_FID_NONE) { |
| 2964 | err = -EINVAL; |
| 2965 | goto out; |
| 2966 | } |
| 2967 | if (perm & P9_STAT_MODE_DIR) { |
| 2968 | err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, |
| 2969 | fidp->uid, -1, &stbuf); |
| 2970 | if (err < 0) { |
| 2971 | goto out; |
| 2972 | } |
| 2973 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| 2974 | if (err < 0) { |
| 2975 | goto out; |
| 2976 | } |
| 2977 | v9fs_path_write_lock(s); |
| 2978 | v9fs_path_copy(&fidp->path, &path); |
| 2979 | v9fs_path_unlock(s); |
| 2980 | err = v9fs_co_opendir(pdu, fidp); |
| 2981 | if (err < 0) { |
| 2982 | goto out; |
| 2983 | } |
| 2984 | fidp->fid_type = P9_FID_DIR; |
| 2985 | } else if (perm & P9_STAT_MODE_SYMLINK) { |
| 2986 | err = v9fs_co_symlink(pdu, fidp, &name, |
| 2987 | extension.data, -1 , &stbuf); |
| 2988 | if (err < 0) { |
| 2989 | goto out; |
| 2990 | } |
| 2991 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| 2992 | if (err < 0) { |
| 2993 | goto out; |
| 2994 | } |
| 2995 | v9fs_path_write_lock(s); |
| 2996 | v9fs_path_copy(&fidp->path, &path); |
| 2997 | v9fs_path_unlock(s); |
| 2998 | } else if (perm & P9_STAT_MODE_LINK) { |
| 2999 | int32_t ofid = atoi(extension.data); |
| 3000 | V9fsFidState *ofidp = get_fid(pdu, ofid); |
| 3001 | if (ofidp == NULL) { |
| 3002 | err = -EINVAL; |
| 3003 | goto out; |
| 3004 | } |
| 3005 | err = v9fs_co_link(pdu, ofidp, fidp, &name); |
| 3006 | put_fid(pdu, ofidp); |
| 3007 | if (err < 0) { |
| 3008 | goto out; |
| 3009 | } |
| 3010 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| 3011 | if (err < 0) { |
| 3012 | fidp->fid_type = P9_FID_NONE; |
| 3013 | goto out; |
| 3014 | } |
| 3015 | v9fs_path_write_lock(s); |
| 3016 | v9fs_path_copy(&fidp->path, &path); |
| 3017 | v9fs_path_unlock(s); |
| 3018 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| 3019 | if (err < 0) { |
| 3020 | fidp->fid_type = P9_FID_NONE; |
| 3021 | goto out; |
| 3022 | } |
| 3023 | } else if (perm & P9_STAT_MODE_DEVICE) { |
| 3024 | char ctype; |
| 3025 | uint32_t major, minor; |
| 3026 | mode_t nmode = 0; |
| 3027 | |
| 3028 | if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { |
| 3029 | err = -errno; |
| 3030 | goto out; |
| 3031 | } |
| 3032 | |
| 3033 | switch (ctype) { |
| 3034 | case 'c': |
| 3035 | nmode = S_IFCHR; |
| 3036 | break; |
| 3037 | case 'b': |
| 3038 | nmode = S_IFBLK; |
| 3039 | break; |
| 3040 | default: |
| 3041 | err = -EIO; |
| 3042 | goto out; |
| 3043 | } |
| 3044 | |
| 3045 | nmode |= perm & 0777; |
| 3046 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
| 3047 | makedev(major, minor), nmode, &stbuf); |
| 3048 | if (err < 0) { |
| 3049 | goto out; |
| 3050 | } |
| 3051 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| 3052 | if (err < 0) { |
| 3053 | goto out; |
| 3054 | } |
| 3055 | v9fs_path_write_lock(s); |
| 3056 | v9fs_path_copy(&fidp->path, &path); |
| 3057 | v9fs_path_unlock(s); |
| 3058 | } else if (perm & P9_STAT_MODE_NAMED_PIPE) { |
| 3059 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
| 3060 | 0, S_IFIFO | (perm & 0777), &stbuf); |
| 3061 | if (err < 0) { |
| 3062 | goto out; |
| 3063 | } |
| 3064 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| 3065 | if (err < 0) { |
| 3066 | goto out; |
| 3067 | } |
| 3068 | v9fs_path_write_lock(s); |
| 3069 | v9fs_path_copy(&fidp->path, &path); |
| 3070 | v9fs_path_unlock(s); |
| 3071 | } else if (perm & P9_STAT_MODE_SOCKET) { |
| 3072 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
| 3073 | 0, S_IFSOCK | (perm & 0777), &stbuf); |
| 3074 | if (err < 0) { |
| 3075 | goto out; |
| 3076 | } |
| 3077 | err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| 3078 | if (err < 0) { |
| 3079 | goto out; |
| 3080 | } |
| 3081 | v9fs_path_write_lock(s); |
| 3082 | v9fs_path_copy(&fidp->path, &path); |
| 3083 | v9fs_path_unlock(s); |
| 3084 | } else { |
| 3085 | err = v9fs_co_open2(pdu, fidp, &name, -1, |
| 3086 | omode_to_uflags(mode) | O_CREAT, perm, &stbuf); |
| 3087 | if (err < 0) { |
| 3088 | goto out; |
| 3089 | } |
| 3090 | fidp->fid_type = P9_FID_FILE; |
| 3091 | fidp->open_flags = omode_to_uflags(mode); |
| 3092 | if (fidp->open_flags & O_EXCL) { |
| 3093 | /* |
| 3094 | * We let the host file system do O_EXCL check |
| 3095 | * We should not reclaim such fd |
| 3096 | */ |
| 3097 | fidp->flags |= FID_NON_RECLAIMABLE; |
| 3098 | } |
| 3099 | } |
| 3100 | iounit = get_iounit(pdu, &fidp->path); |
| 3101 | err = stat_to_qid(pdu, &stbuf, &qid); |
| 3102 | if (err < 0) { |
| 3103 | goto out; |
| 3104 | } |
| 3105 | err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
| 3106 | if (err < 0) { |
| 3107 | goto out; |
| 3108 | } |
| 3109 | err += offset; |
| 3110 | trace_v9fs_create_return(pdu->tag, pdu->id, |
| 3111 | qid.type, qid.version, qid.path, iounit); |
| 3112 | out: |
| 3113 | put_fid(pdu, fidp); |
| 3114 | out_nofid: |
| 3115 | pdu_complete(pdu, err); |
| 3116 | v9fs_string_free(&name); |
| 3117 | v9fs_string_free(&extension); |
| 3118 | v9fs_path_free(&path); |
| 3119 | } |
| 3120 | |
| 3121 | static void coroutine_fn v9fs_symlink(void *opaque) |
| 3122 | { |
| 3123 | V9fsPDU *pdu = opaque; |
| 3124 | V9fsString name; |
| 3125 | V9fsString symname; |
| 3126 | V9fsFidState *dfidp; |
| 3127 | V9fsQID qid; |
| 3128 | struct stat stbuf; |
| 3129 | int32_t dfid; |
| 3130 | int err = 0; |
| 3131 | gid_t gid; |
| 3132 | size_t offset = 7; |
| 3133 | |
| 3134 | v9fs_string_init(&name); |
| 3135 | v9fs_string_init(&symname); |
| 3136 | err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); |
| 3137 | if (err < 0) { |
| 3138 | goto out_nofid; |
| 3139 | } |
| 3140 | trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); |
| 3141 | |
| 3142 | err = check_name(name.data, pdu); |
| 3143 | if (err < 0) { |
| 3144 | goto out_nofid; |
| 3145 | } |
| 3146 | |
| 3147 | dfidp = get_fid(pdu, dfid); |
| 3148 | if (dfidp == NULL) { |
| 3149 | err = -EINVAL; |
| 3150 | goto out_nofid; |
| 3151 | } |
| 3152 | err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); |
| 3153 | if (err < 0) { |
| 3154 | goto out; |
| 3155 | } |
| 3156 | err = stat_to_qid(pdu, &stbuf, &qid); |
| 3157 | if (err < 0) { |
| 3158 | goto out; |
| 3159 | } |
| 3160 | err = pdu_marshal(pdu, offset, "Q", &qid); |
| 3161 | if (err < 0) { |
| 3162 | goto out; |
| 3163 | } |
| 3164 | err += offset; |
| 3165 | trace_v9fs_symlink_return(pdu->tag, pdu->id, |
| 3166 | qid.type, qid.version, qid.path); |
| 3167 | out: |
| 3168 | put_fid(pdu, dfidp); |
| 3169 | out_nofid: |
| 3170 | pdu_complete(pdu, err); |
| 3171 | v9fs_string_free(&name); |
| 3172 | v9fs_string_free(&symname); |
| 3173 | } |
| 3174 | |
| 3175 | static void coroutine_fn v9fs_flush(void *opaque) |
| 3176 | { |
| 3177 | ssize_t err; |
| 3178 | int16_t tag; |
| 3179 | size_t offset = 7; |
| 3180 | V9fsPDU *cancel_pdu = NULL; |
| 3181 | V9fsPDU *pdu = opaque; |
| 3182 | V9fsState *s = pdu->s; |
| 3183 | |
| 3184 | err = pdu_unmarshal(pdu, offset, "w", &tag); |
| 3185 | if (err < 0) { |
| 3186 | pdu_complete(pdu, err); |
| 3187 | return; |
| 3188 | } |
| 3189 | trace_v9fs_flush(pdu->tag, pdu->id, tag); |
| 3190 | |
| 3191 | if (pdu->tag == tag) { |
| 3192 | warn_report("the guest sent a self-referencing 9P flush request"); |
| 3193 | } else { |
| 3194 | QLIST_FOREACH(cancel_pdu, &s->active_list, next) { |
| 3195 | if (cancel_pdu->tag == tag) { |
| 3196 | break; |
| 3197 | } |
| 3198 | } |
| 3199 | } |
| 3200 | if (cancel_pdu) { |
| 3201 | cancel_pdu->cancelled = 1; |
| 3202 | /* |
| 3203 | * Wait for pdu to complete. |
| 3204 | */ |
| 3205 | qemu_co_queue_wait(&cancel_pdu->complete, NULL); |
| 3206 | if (!qemu_co_queue_next(&cancel_pdu->complete)) { |
| 3207 | cancel_pdu->cancelled = 0; |
| 3208 | pdu_free(cancel_pdu); |
| 3209 | } |
| 3210 | } |
| 3211 | pdu_complete(pdu, 7); |
| 3212 | } |
| 3213 | |
| 3214 | static void coroutine_fn v9fs_link(void *opaque) |
| 3215 | { |
| 3216 | V9fsPDU *pdu = opaque; |
| 3217 | int32_t dfid, oldfid; |
| 3218 | V9fsFidState *dfidp, *oldfidp; |
| 3219 | V9fsString name; |
| 3220 | size_t offset = 7; |
| 3221 | int err = 0; |
| 3222 | |
| 3223 | v9fs_string_init(&name); |
| 3224 | err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); |
| 3225 | if (err < 0) { |
| 3226 | goto out_nofid; |
| 3227 | } |
| 3228 | trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); |
| 3229 | |
| 3230 | err = check_name(name.data, pdu); |
| 3231 | if (err < 0) { |
| 3232 | goto out_nofid; |
| 3233 | } |
| 3234 | |
| 3235 | dfidp = get_fid(pdu, dfid); |
| 3236 | if (dfidp == NULL) { |
| 3237 | err = -ENOENT; |
| 3238 | goto out_nofid; |
| 3239 | } |
| 3240 | |
| 3241 | oldfidp = get_fid(pdu, oldfid); |
| 3242 | if (oldfidp == NULL) { |
| 3243 | err = -ENOENT; |
| 3244 | goto out; |
| 3245 | } |
| 3246 | err = v9fs_co_link(pdu, oldfidp, dfidp, &name); |
| 3247 | if (!err) { |
| 3248 | err = offset; |
| 3249 | } |
| 3250 | put_fid(pdu, oldfidp); |
| 3251 | out: |
| 3252 | put_fid(pdu, dfidp); |
| 3253 | out_nofid: |
| 3254 | v9fs_string_free(&name); |
| 3255 | pdu_complete(pdu, err); |
| 3256 | } |
| 3257 | |
| 3258 | /* Only works with path name based fid */ |
| 3259 | static void coroutine_fn v9fs_remove(void *opaque) |
| 3260 | { |
| 3261 | int32_t fid; |
| 3262 | int err = 0; |
| 3263 | size_t offset = 7; |
| 3264 | V9fsFidState *fidp; |
| 3265 | V9fsPDU *pdu = opaque; |
| 3266 | |
| 3267 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
| 3268 | if (err < 0) { |
| 3269 | goto out_nofid; |
| 3270 | } |
| 3271 | trace_v9fs_remove(pdu->tag, pdu->id, fid); |
| 3272 | |
| 3273 | fidp = get_fid(pdu, fid); |
| 3274 | if (fidp == NULL) { |
| 3275 | err = -EINVAL; |
| 3276 | goto out_nofid; |
| 3277 | } |
| 3278 | /* if fs driver is not path based, return EOPNOTSUPP */ |
| 3279 | if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
| 3280 | err = -EOPNOTSUPP; |
| 3281 | goto out_err; |
| 3282 | } |
| 3283 | /* |
| 3284 | * IF the file is unlinked, we cannot reopen |
| 3285 | * the file later. So don't reclaim fd |
| 3286 | */ |
| 3287 | err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); |
| 3288 | if (err < 0) { |
| 3289 | goto out_err; |
| 3290 | } |
| 3291 | err = v9fs_co_remove(pdu, &fidp->path); |
| 3292 | if (!err) { |
| 3293 | err = offset; |
| 3294 | } |
| 3295 | out_err: |
| 3296 | /* For TREMOVE we need to clunk the fid even on failed remove */ |
| 3297 | clunk_fid(pdu->s, fidp->fid); |
| 3298 | put_fid(pdu, fidp); |
| 3299 | out_nofid: |
| 3300 | pdu_complete(pdu, err); |
| 3301 | } |
| 3302 | |
| 3303 | static void coroutine_fn v9fs_unlinkat(void *opaque) |
| 3304 | { |
| 3305 | int err = 0; |
| 3306 | V9fsString name; |
| 3307 | int32_t dfid, flags, rflags = 0; |
| 3308 | size_t offset = 7; |
| 3309 | V9fsPath path; |
| 3310 | V9fsFidState *dfidp; |
| 3311 | V9fsPDU *pdu = opaque; |
| 3312 | |
| 3313 | v9fs_string_init(&name); |
| 3314 | err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); |
| 3315 | if (err < 0) { |
| 3316 | goto out_nofid; |
| 3317 | } |
| 3318 | |
| 3319 | if (name_is_illegal(name.data)) { |
| 3320 | err = -ENOENT; |
| 3321 | goto out_nofid; |
| 3322 | } |
| 3323 | |
| 3324 | if (!strcmp(".", name.data)) { |
| 3325 | err = -EINVAL; |
| 3326 | goto out_nofid; |
| 3327 | } |
| 3328 | |
| 3329 | if (!strcmp("..", name.data)) { |
| 3330 | err = -ENOTEMPTY; |
| 3331 | goto out_nofid; |
| 3332 | } |
| 3333 | |
| 3334 | if (flags & ~P9_DOTL_AT_REMOVEDIR) { |
| 3335 | err = -EINVAL; |
| 3336 | goto out_nofid; |
| 3337 | } |
| 3338 | |
| 3339 | if (flags & P9_DOTL_AT_REMOVEDIR) { |
| 3340 | rflags |= AT_REMOVEDIR; |
| 3341 | } |
| 3342 | |
| 3343 | dfidp = get_fid(pdu, dfid); |
| 3344 | if (dfidp == NULL) { |
| 3345 | err = -EINVAL; |
| 3346 | goto out_nofid; |
| 3347 | } |
| 3348 | /* |
| 3349 | * IF the file is unlinked, we cannot reopen |
| 3350 | * the file later. So don't reclaim fd |
| 3351 | */ |
| 3352 | v9fs_path_init(&path); |
| 3353 | err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); |
| 3354 | if (err < 0) { |
| 3355 | goto out_err; |
| 3356 | } |
| 3357 | err = v9fs_mark_fids_unreclaim(pdu, &path); |
| 3358 | if (err < 0) { |
| 3359 | goto out_err; |
| 3360 | } |
| 3361 | err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); |
| 3362 | if (!err) { |
| 3363 | err = offset; |
| 3364 | } |
| 3365 | out_err: |
| 3366 | put_fid(pdu, dfidp); |
| 3367 | v9fs_path_free(&path); |
| 3368 | out_nofid: |
| 3369 | pdu_complete(pdu, err); |
| 3370 | v9fs_string_free(&name); |
| 3371 | } |
| 3372 | |
| 3373 | |
| 3374 | /* Only works with path name based fid */ |
| 3375 | static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, |
| 3376 | int32_t newdirfid, |
| 3377 | V9fsString *name) |
| 3378 | { |
| 3379 | int err = 0; |
| 3380 | V9fsPath new_path; |
| 3381 | V9fsFidState *tfidp; |
| 3382 | V9fsState *s = pdu->s; |
| 3383 | V9fsFidState *dirfidp = NULL; |
| 3384 | GHashTableIter iter; |
| 3385 | gpointer fid; |
| 3386 | |
| 3387 | v9fs_path_init(&new_path); |
| 3388 | if (newdirfid != -1) { |
| 3389 | dirfidp = get_fid(pdu, newdirfid); |
| 3390 | if (dirfidp == NULL) { |
| 3391 | return -ENOENT; |
| 3392 | } |
| 3393 | if (fidp->fid_type != P9_FID_NONE) { |
| 3394 | err = -EINVAL; |
| 3395 | goto out; |
| 3396 | } |
| 3397 | err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); |
| 3398 | if (err < 0) { |
| 3399 | goto out; |
| 3400 | } |
| 3401 | } else { |
| 3402 | g_autofree char *dir_name = g_path_get_dirname(fidp->path.data); |
| 3403 | V9fsPath dir_path; |
| 3404 | |
| 3405 | v9fs_path_init(&dir_path); |
| 3406 | err = v9fs_path_sprintf(&dir_path, "%s", dir_name); |
| 3407 | if (err < 0) { |
| 3408 | goto out; |
| 3409 | } |
| 3410 | |
| 3411 | err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); |
| 3412 | v9fs_path_free(&dir_path); |
| 3413 | if (err < 0) { |
| 3414 | goto out; |
| 3415 | } |
| 3416 | } |
| 3417 | err = v9fs_co_rename(pdu, &fidp->path, &new_path); |
| 3418 | if (err < 0) { |
| 3419 | goto out; |
| 3420 | } |
| 3421 | |
| 3422 | /* |
| 3423 | * Fixup fid's pointing to the old name to |
| 3424 | * start pointing to the new name |
| 3425 | */ |
| 3426 | g_hash_table_iter_init(&iter, s->fids); |
| 3427 | while (g_hash_table_iter_next(&iter, &fid, (gpointer *) &tfidp)) { |
| 3428 | if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { |
| 3429 | /* replace the name */ |
| 3430 | if (v9fs_fix_path(&tfidp->path, &new_path, |
| 3431 | strlen(fidp->path.data)) < 0) { |
| 3432 | clunk_fid(s, tfidp->fid); |
| 3433 | } |
| 3434 | } |
| 3435 | } |
| 3436 | out: |
| 3437 | if (dirfidp) { |
| 3438 | put_fid(pdu, dirfidp); |
| 3439 | } |
| 3440 | v9fs_path_free(&new_path); |
| 3441 | return err; |
| 3442 | } |
| 3443 | |
| 3444 | /* Only works with path name based fid */ |
| 3445 | static void coroutine_fn v9fs_rename(void *opaque) |
| 3446 | { |
| 3447 | int32_t fid; |
| 3448 | ssize_t err = 0; |
| 3449 | size_t offset = 7; |
| 3450 | V9fsString name; |
| 3451 | int32_t newdirfid; |
| 3452 | V9fsFidState *fidp; |
| 3453 | V9fsPDU *pdu = opaque; |
| 3454 | V9fsState *s = pdu->s; |
| 3455 | |
| 3456 | v9fs_string_init(&name); |
| 3457 | err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); |
| 3458 | if (err < 0) { |
| 3459 | goto out_nofid; |
| 3460 | } |
| 3461 | |
| 3462 | err = check_name(name.data, pdu); |
| 3463 | if (err < 0) { |
| 3464 | goto out_nofid; |
| 3465 | } |
| 3466 | |
| 3467 | fidp = get_fid(pdu, fid); |
| 3468 | if (fidp == NULL) { |
| 3469 | err = -ENOENT; |
| 3470 | goto out_nofid; |
| 3471 | } |
| 3472 | if (fidp->fid_type != P9_FID_NONE) { |
| 3473 | err = -EINVAL; |
| 3474 | goto out; |
| 3475 | } |
| 3476 | /* if fs driver is not path based, return EOPNOTSUPP */ |
| 3477 | if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
| 3478 | err = -EOPNOTSUPP; |
| 3479 | goto out; |
| 3480 | } |
| 3481 | v9fs_path_write_lock(s); |
| 3482 | err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); |
| 3483 | v9fs_path_unlock(s); |
| 3484 | if (!err) { |
| 3485 | err = offset; |
| 3486 | } |
| 3487 | out: |
| 3488 | put_fid(pdu, fidp); |
| 3489 | out_nofid: |
| 3490 | pdu_complete(pdu, err); |
| 3491 | v9fs_string_free(&name); |
| 3492 | } |
| 3493 | |
| 3494 | static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, |
| 3495 | V9fsString *old_name, |
| 3496 | V9fsPath *newdir, |
| 3497 | V9fsString *new_name) |
| 3498 | { |
| 3499 | V9fsFidState *tfidp; |
| 3500 | V9fsPath oldpath, newpath; |
| 3501 | V9fsState *s = pdu->s; |
| 3502 | int err; |
| 3503 | GHashTableIter iter; |
| 3504 | gpointer fid; |
| 3505 | |
| 3506 | v9fs_path_init(&oldpath); |
| 3507 | v9fs_path_init(&newpath); |
| 3508 | err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); |
| 3509 | if (err < 0) { |
| 3510 | goto out; |
| 3511 | } |
| 3512 | err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); |
| 3513 | if (err < 0) { |
| 3514 | goto out; |
| 3515 | } |
| 3516 | |
| 3517 | /* |
| 3518 | * Fixup fid's pointing to the old name to |
| 3519 | * start pointing to the new name |
| 3520 | */ |
| 3521 | g_hash_table_iter_init(&iter, s->fids); |
| 3522 | while (g_hash_table_iter_next(&iter, &fid, (gpointer *) &tfidp)) { |
| 3523 | if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { |
| 3524 | /* replace the name */ |
| 3525 | if (v9fs_fix_path(&tfidp->path, &newpath, |
| 3526 | strlen(oldpath.data)) < 0) { |
| 3527 | clunk_fid(s, tfidp->fid); |
| 3528 | } |
| 3529 | } |
| 3530 | } |
| 3531 | out: |
| 3532 | v9fs_path_free(&oldpath); |
| 3533 | v9fs_path_free(&newpath); |
| 3534 | return err; |
| 3535 | } |
| 3536 | |
| 3537 | static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, |
| 3538 | V9fsString *old_name, |
| 3539 | int32_t newdirfid, |
| 3540 | V9fsString *new_name) |
| 3541 | { |
| 3542 | int err = 0; |
| 3543 | V9fsState *s = pdu->s; |
| 3544 | V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; |
| 3545 | |
| 3546 | olddirfidp = get_fid(pdu, olddirfid); |
| 3547 | if (olddirfidp == NULL) { |
| 3548 | err = -ENOENT; |
| 3549 | goto out; |
| 3550 | } |
| 3551 | if (newdirfid != -1) { |
| 3552 | newdirfidp = get_fid(pdu, newdirfid); |
| 3553 | if (newdirfidp == NULL) { |
| 3554 | err = -ENOENT; |
| 3555 | goto out; |
| 3556 | } |
| 3557 | } else { |
| 3558 | newdirfidp = get_fid(pdu, olddirfid); |
| 3559 | } |
| 3560 | |
| 3561 | err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, |
| 3562 | &newdirfidp->path, new_name); |
| 3563 | if (err < 0) { |
| 3564 | goto out; |
| 3565 | } |
| 3566 | if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { |
| 3567 | /* Only for path based fid we need to do the below fixup */ |
| 3568 | err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, |
| 3569 | &newdirfidp->path, new_name); |
| 3570 | } |
| 3571 | out: |
| 3572 | if (olddirfidp) { |
| 3573 | put_fid(pdu, olddirfidp); |
| 3574 | } |
| 3575 | if (newdirfidp) { |
| 3576 | put_fid(pdu, newdirfidp); |
| 3577 | } |
| 3578 | return err; |
| 3579 | } |
| 3580 | |
| 3581 | static void coroutine_fn v9fs_renameat(void *opaque) |
| 3582 | { |
| 3583 | ssize_t err = 0; |
| 3584 | size_t offset = 7; |
| 3585 | V9fsPDU *pdu = opaque; |
| 3586 | V9fsState *s = pdu->s; |
| 3587 | int32_t olddirfid, newdirfid; |
| 3588 | V9fsString old_name, new_name; |
| 3589 | |
| 3590 | v9fs_string_init(&old_name); |
| 3591 | v9fs_string_init(&new_name); |
| 3592 | err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, |
| 3593 | &old_name, &newdirfid, &new_name); |
| 3594 | if (err < 0) { |
| 3595 | goto out_err; |
| 3596 | } |
| 3597 | |
| 3598 | err = check_name(old_name.data, pdu); |
| 3599 | if (err < 0) { |
| 3600 | goto out_err; |
| 3601 | } |
| 3602 | err = check_name(new_name.data, pdu); |
| 3603 | if (err < 0) { |
| 3604 | goto out_err; |
| 3605 | } |
| 3606 | |
| 3607 | /* if fs driver is not path based, return EOPNOTSUPP */ |
| 3608 | if (!(s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
| 3609 | err = -EOPNOTSUPP; |
| 3610 | goto out_err; |
| 3611 | } |
| 3612 | |
| 3613 | v9fs_path_write_lock(s); |
| 3614 | err = v9fs_complete_renameat(pdu, olddirfid, |
| 3615 | &old_name, newdirfid, &new_name); |
| 3616 | v9fs_path_unlock(s); |
| 3617 | if (!err) { |
| 3618 | err = offset; |
| 3619 | } |
| 3620 | |
| 3621 | out_err: |
| 3622 | pdu_complete(pdu, err); |
| 3623 | v9fs_string_free(&old_name); |
| 3624 | v9fs_string_free(&new_name); |
| 3625 | } |
| 3626 | |
| 3627 | static void coroutine_fn v9fs_wstat(void *opaque) |
| 3628 | { |
| 3629 | int32_t fid; |
| 3630 | int err = 0; |
| 3631 | int16_t unused; |
| 3632 | V9fsStat v9stat; |
| 3633 | size_t offset = 7; |
| 3634 | struct stat stbuf; |
| 3635 | V9fsFidState *fidp; |
| 3636 | V9fsPDU *pdu = opaque; |
| 3637 | V9fsState *s = pdu->s; |
| 3638 | |
| 3639 | v9fs_stat_init(&v9stat); |
| 3640 | err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); |
| 3641 | if (err < 0) { |
| 3642 | goto out_nofid; |
| 3643 | } |
| 3644 | trace_v9fs_wstat(pdu->tag, pdu->id, fid, |
| 3645 | v9stat.mode, v9stat.atime, v9stat.mtime); |
| 3646 | |
| 3647 | fidp = get_fid(pdu, fid); |
| 3648 | if (fidp == NULL) { |
| 3649 | err = -EINVAL; |
| 3650 | goto out_nofid; |
| 3651 | } |
| 3652 | /* do we need to sync the file? */ |
| 3653 | if (donttouch_stat(&v9stat)) { |
| 3654 | if (!fid_has_valid_file_handle(s, fidp)) { |
| 3655 | err = -EBADF; |
| 3656 | goto out; |
| 3657 | } |
| 3658 | err = v9fs_co_fsync(pdu, fidp, 0); |
| 3659 | goto out; |
| 3660 | } |
| 3661 | if (v9stat.mode != -1) { |
| 3662 | uint32_t v9_mode; |
| 3663 | err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| 3664 | if (err < 0) { |
| 3665 | goto out; |
| 3666 | } |
| 3667 | v9_mode = stat_to_v9mode(&stbuf); |
| 3668 | if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != |
| 3669 | (v9_mode & P9_STAT_MODE_TYPE_BITS)) { |
| 3670 | /* Attempting to change the type */ |
| 3671 | err = -EIO; |
| 3672 | goto out; |
| 3673 | } |
| 3674 | err = v9fs_co_chmod(pdu, &fidp->path, |
| 3675 | v9mode_to_mode(v9stat.mode, |
| 3676 | &v9stat.extension)); |
| 3677 | if (err < 0) { |
| 3678 | goto out; |
| 3679 | } |
| 3680 | } |
| 3681 | if (v9stat.mtime != -1 || v9stat.atime != -1) { |
| 3682 | struct timespec times[2]; |
| 3683 | if (v9stat.atime != -1) { |
| 3684 | times[0].tv_sec = v9stat.atime; |
| 3685 | times[0].tv_nsec = 0; |
| 3686 | } else { |
| 3687 | times[0].tv_nsec = UTIME_OMIT; |
| 3688 | } |
| 3689 | if (v9stat.mtime != -1) { |
| 3690 | times[1].tv_sec = v9stat.mtime; |
| 3691 | times[1].tv_nsec = 0; |
| 3692 | } else { |
| 3693 | times[1].tv_nsec = UTIME_OMIT; |
| 3694 | } |
| 3695 | err = v9fs_co_utimensat(pdu, &fidp->path, times); |
| 3696 | if (err < 0) { |
| 3697 | goto out; |
| 3698 | } |
| 3699 | } |
| 3700 | if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { |
| 3701 | err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); |
| 3702 | if (err < 0) { |
| 3703 | goto out; |
| 3704 | } |
| 3705 | } |
| 3706 | if (v9stat.name.size != 0) { |
| 3707 | /* if fs driver is not path based, return EOPNOTSUPP */ |
| 3708 | if (!(s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
| 3709 | err = -EOPNOTSUPP; |
| 3710 | goto out; |
| 3711 | } |
| 3712 | err = check_name(v9stat.name.data, pdu); |
| 3713 | if (err < 0) { |
| 3714 | goto out; |
| 3715 | } |
| 3716 | |
| 3717 | v9fs_path_write_lock(s); |
| 3718 | err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); |
| 3719 | v9fs_path_unlock(s); |
| 3720 | if (err < 0) { |
| 3721 | goto out; |
| 3722 | } |
| 3723 | } |
| 3724 | if (v9stat.length != -1) { |
| 3725 | err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); |
| 3726 | if (err < 0) { |
| 3727 | goto out; |
| 3728 | } |
| 3729 | } |
| 3730 | err = offset; |
| 3731 | out: |
| 3732 | put_fid(pdu, fidp); |
| 3733 | out_nofid: |
| 3734 | v9fs_stat_free(&v9stat); |
| 3735 | pdu_complete(pdu, err); |
| 3736 | } |
| 3737 | |
| 3738 | static int coroutine_fn |
| 3739 | v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) |
| 3740 | { |
| 3741 | uint32_t f_type; |
| 3742 | uint32_t f_bsize; |
| 3743 | uint64_t f_blocks; |
| 3744 | uint64_t f_bfree; |
| 3745 | uint64_t f_bavail; |
| 3746 | uint64_t f_files; |
| 3747 | uint64_t f_ffree; |
| 3748 | uint64_t fsid_val; |
| 3749 | uint32_t f_namelen; |
| 3750 | size_t offset = 7; |
| 3751 | int32_t bsize_factor; |
| 3752 | |
| 3753 | /* |
| 3754 | * compute bsize factor based on host file system block size |
| 3755 | * and client msize |
| 3756 | */ |
| 3757 | bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; |
| 3758 | if (!bsize_factor) { |
| 3759 | bsize_factor = 1; |
| 3760 | } |
| 3761 | f_type = stbuf->f_type; |
| 3762 | f_bsize = stbuf->f_bsize; |
| 3763 | f_bsize *= bsize_factor; |
| 3764 | /* |
| 3765 | * f_bsize is adjusted(multiplied) by bsize factor, so we need to |
| 3766 | * adjust(divide) the number of blocks, free blocks and available |
| 3767 | * blocks by bsize factor |
| 3768 | */ |
| 3769 | f_blocks = stbuf->f_blocks / bsize_factor; |
| 3770 | f_bfree = stbuf->f_bfree / bsize_factor; |
| 3771 | f_bavail = stbuf->f_bavail / bsize_factor; |
| 3772 | f_files = stbuf->f_files; |
| 3773 | f_ffree = stbuf->f_ffree; |
| 3774 | #if defined(CONFIG_DARWIN) || defined(CONFIG_FREEBSD) |
| 3775 | fsid_val = (unsigned int)stbuf->f_fsid.val[0] | |
| 3776 | (unsigned long long)stbuf->f_fsid.val[1] << 32; |
| 3777 | f_namelen = NAME_MAX; |
| 3778 | #else |
| 3779 | fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | |
| 3780 | (unsigned long long)stbuf->f_fsid.__val[1] << 32; |
| 3781 | f_namelen = stbuf->f_namelen; |
| 3782 | #endif |
| 3783 | |
| 3784 | return pdu_marshal(pdu, offset, "ddqqqqqqd", |
| 3785 | f_type, f_bsize, f_blocks, f_bfree, |
| 3786 | f_bavail, f_files, f_ffree, |
| 3787 | fsid_val, f_namelen); |
| 3788 | } |
| 3789 | |
| 3790 | static void coroutine_fn v9fs_statfs(void *opaque) |
| 3791 | { |
| 3792 | int32_t fid; |
| 3793 | ssize_t retval = 0; |
| 3794 | size_t offset = 7; |
| 3795 | V9fsFidState *fidp; |
| 3796 | struct statfs stbuf; |
| 3797 | V9fsPDU *pdu = opaque; |
| 3798 | V9fsState *s = pdu->s; |
| 3799 | |
| 3800 | retval = pdu_unmarshal(pdu, offset, "d", &fid); |
| 3801 | if (retval < 0) { |
| 3802 | goto out_nofid; |
| 3803 | } |
| 3804 | fidp = get_fid(pdu, fid); |
| 3805 | if (fidp == NULL) { |
| 3806 | retval = -ENOENT; |
| 3807 | goto out_nofid; |
| 3808 | } |
| 3809 | retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); |
| 3810 | if (retval < 0) { |
| 3811 | goto out; |
| 3812 | } |
| 3813 | retval = v9fs_fill_statfs(s, pdu, &stbuf); |
| 3814 | if (retval < 0) { |
| 3815 | goto out; |
| 3816 | } |
| 3817 | retval += offset; |
| 3818 | out: |
| 3819 | put_fid(pdu, fidp); |
| 3820 | out_nofid: |
| 3821 | pdu_complete(pdu, retval); |
| 3822 | } |
| 3823 | |
| 3824 | static void coroutine_fn v9fs_mknod(void *opaque) |
| 3825 | { |
| 3826 | |
| 3827 | int mode; |
| 3828 | gid_t gid; |
| 3829 | int32_t fid; |
| 3830 | V9fsQID qid; |
| 3831 | int err = 0; |
| 3832 | int major, minor; |
| 3833 | size_t offset = 7; |
| 3834 | V9fsString name; |
| 3835 | struct stat stbuf; |
| 3836 | V9fsFidState *fidp; |
| 3837 | V9fsPDU *pdu = opaque; |
| 3838 | |
| 3839 | v9fs_string_init(&name); |
| 3840 | err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, |
| 3841 | &major, &minor, &gid); |
| 3842 | if (err < 0) { |
| 3843 | goto out_nofid; |
| 3844 | } |
| 3845 | trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); |
| 3846 | |
| 3847 | err = check_name(name.data, pdu); |
| 3848 | if (err < 0) { |
| 3849 | goto out_nofid; |
| 3850 | } |
| 3851 | |
| 3852 | fidp = get_fid(pdu, fid); |
| 3853 | if (fidp == NULL) { |
| 3854 | err = -ENOENT; |
| 3855 | goto out_nofid; |
| 3856 | } |
| 3857 | err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, |
| 3858 | makedev(major, minor), mode, &stbuf); |
| 3859 | if (err < 0) { |
| 3860 | goto out; |
| 3861 | } |
| 3862 | err = stat_to_qid(pdu, &stbuf, &qid); |
| 3863 | if (err < 0) { |
| 3864 | goto out; |
| 3865 | } |
| 3866 | err = pdu_marshal(pdu, offset, "Q", &qid); |
| 3867 | if (err < 0) { |
| 3868 | goto out; |
| 3869 | } |
| 3870 | err += offset; |
| 3871 | trace_v9fs_mknod_return(pdu->tag, pdu->id, |
| 3872 | qid.type, qid.version, qid.path); |
| 3873 | out: |
| 3874 | put_fid(pdu, fidp); |
| 3875 | out_nofid: |
| 3876 | pdu_complete(pdu, err); |
| 3877 | v9fs_string_free(&name); |
| 3878 | } |
| 3879 | |
| 3880 | /* |
| 3881 | * Implement posix byte range locking code |
| 3882 | * Server side handling of locking code is very simple, because 9p server in |
| 3883 | * QEMU can handle only one client. And most of the lock handling |
| 3884 | * (like conflict, merging) etc is done by the VFS layer itself, so no need to |
| 3885 | * do any thing in * qemu 9p server side lock code path. |
| 3886 | * So when a TLOCK request comes, always return success |
| 3887 | */ |
| 3888 | static void coroutine_fn v9fs_lock(void *opaque) |
| 3889 | { |
| 3890 | V9fsFlock flock; |
| 3891 | size_t offset = 7; |
| 3892 | struct stat stbuf; |
| 3893 | V9fsFidState *fidp; |
| 3894 | int32_t fid, err = 0; |
| 3895 | V9fsPDU *pdu = opaque; |
| 3896 | |
| 3897 | v9fs_string_init(&flock.client_id); |
| 3898 | err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, |
| 3899 | &flock.flags, &flock.start, &flock.length, |
| 3900 | &flock.proc_id, &flock.client_id); |
| 3901 | if (err < 0) { |
| 3902 | goto out_nofid; |
| 3903 | } |
| 3904 | trace_v9fs_lock(pdu->tag, pdu->id, fid, |
| 3905 | flock.type, flock.start, flock.length); |
| 3906 | |
| 3907 | |
| 3908 | /* We support only block flag now (that too ignored currently) */ |
| 3909 | if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { |
| 3910 | err = -EINVAL; |
| 3911 | goto out_nofid; |
| 3912 | } |
| 3913 | fidp = get_fid(pdu, fid); |
| 3914 | if (fidp == NULL) { |
| 3915 | err = -ENOENT; |
| 3916 | goto out_nofid; |
| 3917 | } |
| 3918 | if (!fid_has_valid_file_handle(pdu->s, fidp)) { |
| 3919 | err = -EBADF; |
| 3920 | goto out; |
| 3921 | } |
| 3922 | err = v9fs_co_fstat(pdu, fidp, &stbuf); |
| 3923 | if (err < 0) { |
| 3924 | goto out; |
| 3925 | } |
| 3926 | err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); |
| 3927 | if (err < 0) { |
| 3928 | goto out; |
| 3929 | } |
| 3930 | err += offset; |
| 3931 | trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); |
| 3932 | out: |
| 3933 | put_fid(pdu, fidp); |
| 3934 | out_nofid: |
| 3935 | pdu_complete(pdu, err); |
| 3936 | v9fs_string_free(&flock.client_id); |
| 3937 | } |
| 3938 | |
| 3939 | /* |
| 3940 | * When a TGETLOCK request comes, always return success because all lock |
| 3941 | * handling is done by client's VFS layer. |
| 3942 | */ |
| 3943 | static void coroutine_fn v9fs_getlock(void *opaque) |
| 3944 | { |
| 3945 | size_t offset = 7; |
| 3946 | struct stat stbuf; |
| 3947 | V9fsFidState *fidp; |
| 3948 | V9fsGetlock glock; |
| 3949 | int32_t fid, err = 0; |
| 3950 | V9fsPDU *pdu = opaque; |
| 3951 | |
| 3952 | v9fs_string_init(&glock.client_id); |
| 3953 | err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, |
| 3954 | &glock.start, &glock.length, &glock.proc_id, |
| 3955 | &glock.client_id); |
| 3956 | if (err < 0) { |
| 3957 | goto out_nofid; |
| 3958 | } |
| 3959 | trace_v9fs_getlock(pdu->tag, pdu->id, fid, |
| 3960 | glock.type, glock.start, glock.length); |
| 3961 | |
| 3962 | fidp = get_fid(pdu, fid); |
| 3963 | if (fidp == NULL) { |
| 3964 | err = -ENOENT; |
| 3965 | goto out_nofid; |
| 3966 | } |
| 3967 | if (!fid_has_valid_file_handle(pdu->s, fidp)) { |
| 3968 | err = -EBADF; |
| 3969 | goto out; |
| 3970 | } |
| 3971 | err = v9fs_co_fstat(pdu, fidp, &stbuf); |
| 3972 | if (err < 0) { |
| 3973 | goto out; |
| 3974 | } |
| 3975 | glock.type = P9_LOCK_TYPE_UNLCK; |
| 3976 | err = pdu_marshal(pdu, offset, "bqqds", glock.type, |
| 3977 | glock.start, glock.length, glock.proc_id, |
| 3978 | &glock.client_id); |
| 3979 | if (err < 0) { |
| 3980 | goto out; |
| 3981 | } |
| 3982 | err += offset; |
| 3983 | trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, |
| 3984 | glock.length, glock.proc_id); |
| 3985 | out: |
| 3986 | put_fid(pdu, fidp); |
| 3987 | out_nofid: |
| 3988 | pdu_complete(pdu, err); |
| 3989 | v9fs_string_free(&glock.client_id); |
| 3990 | } |
| 3991 | |
| 3992 | static void coroutine_fn v9fs_mkdir(void *opaque) |
| 3993 | { |
| 3994 | V9fsPDU *pdu = opaque; |
| 3995 | size_t offset = 7; |
| 3996 | int32_t fid; |
| 3997 | struct stat stbuf; |
| 3998 | V9fsQID qid; |
| 3999 | V9fsString name; |
| 4000 | V9fsFidState *fidp; |
| 4001 | gid_t gid; |
| 4002 | int mode; |
| 4003 | int err = 0; |
| 4004 | |
| 4005 | v9fs_string_init(&name); |
| 4006 | err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); |
| 4007 | if (err < 0) { |
| 4008 | goto out_nofid; |
| 4009 | } |
| 4010 | trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); |
| 4011 | |
| 4012 | err = check_name(name.data, pdu); |
| 4013 | if (err < 0) { |
| 4014 | goto out_nofid; |
| 4015 | } |
| 4016 | |
| 4017 | fidp = get_fid(pdu, fid); |
| 4018 | if (fidp == NULL) { |
| 4019 | err = -ENOENT; |
| 4020 | goto out_nofid; |
| 4021 | } |
| 4022 | err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); |
| 4023 | if (err < 0) { |
| 4024 | goto out; |
| 4025 | } |
| 4026 | err = stat_to_qid(pdu, &stbuf, &qid); |
| 4027 | if (err < 0) { |
| 4028 | goto out; |
| 4029 | } |
| 4030 | err = pdu_marshal(pdu, offset, "Q", &qid); |
| 4031 | if (err < 0) { |
| 4032 | goto out; |
| 4033 | } |
| 4034 | err += offset; |
| 4035 | trace_v9fs_mkdir_return(pdu->tag, pdu->id, |
| 4036 | qid.type, qid.version, qid.path, err); |
| 4037 | out: |
| 4038 | put_fid(pdu, fidp); |
| 4039 | out_nofid: |
| 4040 | pdu_complete(pdu, err); |
| 4041 | v9fs_string_free(&name); |
| 4042 | } |
| 4043 | |
| 4044 | static void coroutine_fn v9fs_xattrwalk(void *opaque) |
| 4045 | { |
| 4046 | int64_t size; |
| 4047 | V9fsString name; |
| 4048 | ssize_t err = 0; |
| 4049 | size_t offset = 7; |
| 4050 | int32_t fid, newfid; |
| 4051 | V9fsFidState *file_fidp; |
| 4052 | V9fsFidState *xattr_fidp = NULL; |
| 4053 | V9fsPDU *pdu = opaque; |
| 4054 | V9fsState *s = pdu->s; |
| 4055 | |
| 4056 | v9fs_string_init(&name); |
| 4057 | err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); |
| 4058 | if (err < 0) { |
| 4059 | goto out_nofid; |
| 4060 | } |
| 4061 | trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); |
| 4062 | |
| 4063 | file_fidp = get_fid(pdu, fid); |
| 4064 | if (file_fidp == NULL) { |
| 4065 | err = -ENOENT; |
| 4066 | goto out_nofid; |
| 4067 | } |
| 4068 | xattr_fidp = alloc_fid(s, newfid); |
| 4069 | if (xattr_fidp == NULL) { |
| 4070 | err = -EINVAL; |
| 4071 | goto out; |
| 4072 | } |
| 4073 | v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); |
| 4074 | if (!v9fs_string_size(&name)) { |
| 4075 | /* |
| 4076 | * listxattr request. Get the size first |
| 4077 | */ |
| 4078 | size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); |
| 4079 | if (size < 0) { |
| 4080 | err = size; |
| 4081 | clunk_fid(s, xattr_fidp->fid); |
| 4082 | goto out; |
| 4083 | } |
| 4084 | |
| 4085 | /* Check xattr FID limit */ |
| 4086 | err = xattr_fid_count_inc(pdu); |
| 4087 | if (err < 0) { |
| 4088 | clunk_fid(s, xattr_fidp->fid); |
| 4089 | goto out; |
| 4090 | } |
| 4091 | |
| 4092 | /* |
| 4093 | * Read the xattr value |
| 4094 | */ |
| 4095 | xattr_fidp->fs.xattr.len = size; |
| 4096 | xattr_fidp->fid_type = P9_FID_XATTR; |
| 4097 | xattr_fidp->fs.xattr.xattrwalk_fid = true; |
| 4098 | xattr_fidp->fs.xattr.value = g_malloc0(size); |
| 4099 | |
| 4100 | if (size) { |
| 4101 | err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, |
| 4102 | xattr_fidp->fs.xattr.value, |
| 4103 | xattr_fidp->fs.xattr.len); |
| 4104 | if (err < 0) { |
| 4105 | clunk_fid(s, xattr_fidp->fid); |
| 4106 | goto out; |
| 4107 | } |
| 4108 | } |
| 4109 | err = pdu_marshal(pdu, offset, "q", size); |
| 4110 | if (err < 0) { |
| 4111 | goto out; |
| 4112 | } |
| 4113 | err += offset; |
| 4114 | } else { |
| 4115 | /* |
| 4116 | * specific xattr fid. We check for xattr |
| 4117 | * presence also collect the xattr size |
| 4118 | */ |
| 4119 | size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, |
| 4120 | &name, NULL, 0); |
| 4121 | if (size < 0) { |
| 4122 | err = size; |
| 4123 | clunk_fid(s, xattr_fidp->fid); |
| 4124 | goto out; |
| 4125 | } |
| 4126 | |
| 4127 | /* Check xattr FID limit */ |
| 4128 | err = xattr_fid_count_inc(pdu); |
| 4129 | if (err < 0) { |
| 4130 | clunk_fid(s, xattr_fidp->fid); |
| 4131 | goto out; |
| 4132 | } |
| 4133 | |
| 4134 | /* |
| 4135 | * Read the xattr value |
| 4136 | */ |
| 4137 | xattr_fidp->fs.xattr.len = size; |
| 4138 | xattr_fidp->fid_type = P9_FID_XATTR; |
| 4139 | xattr_fidp->fs.xattr.xattrwalk_fid = true; |
| 4140 | xattr_fidp->fs.xattr.value = g_malloc0(size); |
| 4141 | |
| 4142 | if (size) { |
| 4143 | err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, |
| 4144 | &name, xattr_fidp->fs.xattr.value, |
| 4145 | xattr_fidp->fs.xattr.len); |
| 4146 | if (err < 0) { |
| 4147 | clunk_fid(s, xattr_fidp->fid); |
| 4148 | goto out; |
| 4149 | } |
| 4150 | } |
| 4151 | err = pdu_marshal(pdu, offset, "q", size); |
| 4152 | if (err < 0) { |
| 4153 | goto out; |
| 4154 | } |
| 4155 | err += offset; |
| 4156 | } |
| 4157 | trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); |
| 4158 | out: |
| 4159 | put_fid(pdu, file_fidp); |
| 4160 | if (xattr_fidp) { |
| 4161 | put_fid(pdu, xattr_fidp); |
| 4162 | } |
| 4163 | out_nofid: |
| 4164 | pdu_complete(pdu, err); |
| 4165 | v9fs_string_free(&name); |
| 4166 | } |
| 4167 | |
| 4168 | #if defined(CONFIG_LINUX) |
| 4169 | /* Currently, only Linux has XATTR_SIZE_MAX */ |
| 4170 | #define P9_XATTR_SIZE_MAX XATTR_SIZE_MAX |
| 4171 | #elif defined(CONFIG_DARWIN) |
| 4172 | /* |
| 4173 | * Darwin doesn't seem to define a maximum xattr size in its user |
| 4174 | * space header, so manually configure it across platforms as 64k. |
| 4175 | * |
| 4176 | * Having no limit at all can lead to QEMU crashing during large g_malloc() |
| 4177 | * calls. Because QEMU does not currently support macOS guests, the below |
| 4178 | * preliminary solution only works due to its being a reflection of the limit of |
| 4179 | * Linux guests. |
| 4180 | */ |
| 4181 | #define P9_XATTR_SIZE_MAX 65536 |
| 4182 | #elif defined(CONFIG_FREEBSD) |
| 4183 | /* |
| 4184 | * FreeBSD similarly doesn't define a maximum xattr size, the limit is |
| 4185 | * filesystem dependent. On UFS filesystems it's 2 times the filesystem block |
| 4186 | * size, typically 32KB. On ZFS it depends on the value of the xattr property; |
| 4187 | * with the default value there is no limit, and with xattr=sa it is 64KB. |
| 4188 | * |
| 4189 | * So, a limit of 64k seems reasonable here too. |
| 4190 | */ |
| 4191 | #define P9_XATTR_SIZE_MAX 65536 |
| 4192 | #else |
| 4193 | #error Missing definition for P9_XATTR_SIZE_MAX for this host system |
| 4194 | #endif |
| 4195 | |
| 4196 | static void coroutine_fn v9fs_xattrcreate(void *opaque) |
| 4197 | { |
| 4198 | int flags, rflags = 0; |
| 4199 | int32_t fid; |
| 4200 | uint64_t size; |
| 4201 | ssize_t err = 0; |
| 4202 | V9fsString name; |
| 4203 | size_t offset = 7; |
| 4204 | V9fsFidState *file_fidp; |
| 4205 | V9fsFidState *xattr_fidp; |
| 4206 | V9fsPDU *pdu = opaque; |
| 4207 | |
| 4208 | v9fs_string_init(&name); |
| 4209 | err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); |
| 4210 | if (err < 0) { |
| 4211 | goto out_nofid; |
| 4212 | } |
| 4213 | trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); |
| 4214 | |
| 4215 | if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { |
| 4216 | err = -EINVAL; |
| 4217 | goto out_nofid; |
| 4218 | } |
| 4219 | |
| 4220 | if (flags & P9_XATTR_CREATE) { |
| 4221 | rflags |= XATTR_CREATE; |
| 4222 | } |
| 4223 | |
| 4224 | if (flags & P9_XATTR_REPLACE) { |
| 4225 | rflags |= XATTR_REPLACE; |
| 4226 | } |
| 4227 | |
| 4228 | if (size > P9_XATTR_SIZE_MAX) { |
| 4229 | err = -E2BIG; |
| 4230 | goto out_nofid; |
| 4231 | } |
| 4232 | |
| 4233 | file_fidp = get_fid(pdu, fid); |
| 4234 | if (file_fidp == NULL) { |
| 4235 | err = -EINVAL; |
| 4236 | goto out_nofid; |
| 4237 | } |
| 4238 | if (file_fidp->fid_type != P9_FID_NONE) { |
| 4239 | err = -EINVAL; |
| 4240 | goto out_put_fid; |
| 4241 | } |
| 4242 | |
| 4243 | /* Check xattr FID limit */ |
| 4244 | err = xattr_fid_count_inc(pdu); |
| 4245 | if (err < 0) { |
| 4246 | goto out_put_fid; |
| 4247 | } |
| 4248 | |
| 4249 | /* Make the file fid point to xattr */ |
| 4250 | xattr_fidp = file_fidp; |
| 4251 | xattr_fidp->fid_type = P9_FID_XATTR; |
| 4252 | xattr_fidp->fs.xattr.copied_len = 0; |
| 4253 | xattr_fidp->fs.xattr.xattrwalk_fid = false; |
| 4254 | xattr_fidp->fs.xattr.len = size; |
| 4255 | xattr_fidp->fs.xattr.flags = rflags; |
| 4256 | v9fs_string_init(&xattr_fidp->fs.xattr.name); |
| 4257 | v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); |
| 4258 | xattr_fidp->fs.xattr.value = g_malloc0(size); |
| 4259 | err = offset; |
| 4260 | out_put_fid: |
| 4261 | put_fid(pdu, file_fidp); |
| 4262 | out_nofid: |
| 4263 | pdu_complete(pdu, err); |
| 4264 | v9fs_string_free(&name); |
| 4265 | } |
| 4266 | |
| 4267 | static void coroutine_fn v9fs_readlink(void *opaque) |
| 4268 | { |
| 4269 | V9fsPDU *pdu = opaque; |
| 4270 | size_t offset = 7; |
| 4271 | V9fsString target; |
| 4272 | int32_t fid; |
| 4273 | int err = 0; |
| 4274 | V9fsFidState *fidp; |
| 4275 | |
| 4276 | err = pdu_unmarshal(pdu, offset, "d", &fid); |
| 4277 | if (err < 0) { |
| 4278 | goto out_nofid; |
| 4279 | } |
| 4280 | trace_v9fs_readlink(pdu->tag, pdu->id, fid); |
| 4281 | fidp = get_fid(pdu, fid); |
| 4282 | if (fidp == NULL) { |
| 4283 | err = -ENOENT; |
| 4284 | goto out_nofid; |
| 4285 | } |
| 4286 | |
| 4287 | v9fs_string_init(&target); |
| 4288 | err = v9fs_co_readlink(pdu, &fidp->path, &target); |
| 4289 | if (err < 0) { |
| 4290 | goto out; |
| 4291 | } |
| 4292 | err = pdu_marshal(pdu, offset, "s", &target); |
| 4293 | if (err < 0) { |
| 4294 | v9fs_string_free(&target); |
| 4295 | goto out; |
| 4296 | } |
| 4297 | err += offset; |
| 4298 | trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); |
| 4299 | v9fs_string_free(&target); |
| 4300 | out: |
| 4301 | put_fid(pdu, fidp); |
| 4302 | out_nofid: |
| 4303 | pdu_complete(pdu, err); |
| 4304 | } |
| 4305 | |
| 4306 | static CoroutineEntry *pdu_co_handlers[] = { |
| 4307 | [P9_TREADDIR] = v9fs_readdir, |
| 4308 | [P9_TSTATFS] = v9fs_statfs, |
| 4309 | [P9_TGETATTR] = v9fs_getattr, |
| 4310 | [P9_TSETATTR] = v9fs_setattr, |
| 4311 | [P9_TXATTRWALK] = v9fs_xattrwalk, |
| 4312 | [P9_TXATTRCREATE] = v9fs_xattrcreate, |
| 4313 | [P9_TMKNOD] = v9fs_mknod, |
| 4314 | [P9_TRENAME] = v9fs_rename, |
| 4315 | [P9_TLOCK] = v9fs_lock, |
| 4316 | [P9_TGETLOCK] = v9fs_getlock, |
| 4317 | [P9_TRENAMEAT] = v9fs_renameat, |
| 4318 | [P9_TREADLINK] = v9fs_readlink, |
| 4319 | [P9_TUNLINKAT] = v9fs_unlinkat, |
| 4320 | [P9_TMKDIR] = v9fs_mkdir, |
| 4321 | [P9_TVERSION] = v9fs_version, |
| 4322 | [P9_TLOPEN] = v9fs_open, |
| 4323 | [P9_TATTACH] = v9fs_attach, |
| 4324 | [P9_TSTAT] = v9fs_stat, |
| 4325 | [P9_TWALK] = v9fs_walk, |
| 4326 | [P9_TCLUNK] = v9fs_clunk, |
| 4327 | [P9_TFSYNC] = v9fs_fsync, |
| 4328 | [P9_TOPEN] = v9fs_open, |
| 4329 | [P9_TREAD] = v9fs_read, |
| 4330 | #if 0 |
| 4331 | [P9_TAUTH] = v9fs_auth, |
| 4332 | #endif |
| 4333 | [P9_TFLUSH] = v9fs_flush, |
| 4334 | [P9_TLINK] = v9fs_link, |
| 4335 | [P9_TSYMLINK] = v9fs_symlink, |
| 4336 | [P9_TCREATE] = v9fs_create, |
| 4337 | [P9_TLCREATE] = v9fs_lcreate, |
| 4338 | [P9_TWRITE] = v9fs_write, |
| 4339 | [P9_TWSTAT] = v9fs_wstat, |
| 4340 | [P9_TREMOVE] = v9fs_remove, |
| 4341 | }; |
| 4342 | |
| 4343 | static void coroutine_fn v9fs_op_not_supp(void *opaque) |
| 4344 | { |
| 4345 | V9fsPDU *pdu = opaque; |
| 4346 | pdu_complete(pdu, -EOPNOTSUPP); |
| 4347 | } |
| 4348 | |
| 4349 | static void coroutine_fn v9fs_fs_ro(void *opaque) |
| 4350 | { |
| 4351 | V9fsPDU *pdu = opaque; |
| 4352 | pdu_complete(pdu, -EROFS); |
| 4353 | } |
| 4354 | |
| 4355 | static inline bool is_read_only_op(V9fsPDU *pdu) |
| 4356 | { |
| 4357 | switch (pdu->id) { |
| 4358 | case P9_TREADDIR: |
| 4359 | case P9_TSTATFS: |
| 4360 | case P9_TGETATTR: |
| 4361 | case P9_TXATTRWALK: |
| 4362 | case P9_TLOCK: |
| 4363 | case P9_TGETLOCK: |
| 4364 | case P9_TREADLINK: |
| 4365 | case P9_TVERSION: |
| 4366 | case P9_TLOPEN: |
| 4367 | case P9_TATTACH: |
| 4368 | case P9_TSTAT: |
| 4369 | case P9_TWALK: |
| 4370 | case P9_TCLUNK: |
| 4371 | case P9_TFSYNC: |
| 4372 | case P9_TOPEN: |
| 4373 | case P9_TREAD: |
| 4374 | case P9_TAUTH: |
| 4375 | case P9_TFLUSH: |
| 4376 | return 1; |
| 4377 | default: |
| 4378 | return 0; |
| 4379 | } |
| 4380 | } |
| 4381 | |
| 4382 | void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) |
| 4383 | { |
| 4384 | Coroutine *co; |
| 4385 | CoroutineEntry *handler; |
| 4386 | V9fsState *s = pdu->s; |
| 4387 | |
| 4388 | pdu->size = le32_to_cpu(hdr->size_le); |
| 4389 | pdu->id = hdr->id; |
| 4390 | pdu->tag = le16_to_cpu(hdr->tag_le); |
| 4391 | |
| 4392 | if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || |
| 4393 | (pdu_co_handlers[pdu->id] == NULL)) { |
| 4394 | handler = v9fs_op_not_supp; |
| 4395 | } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { |
| 4396 | handler = v9fs_fs_ro; |
| 4397 | } else { |
| 4398 | handler = pdu_co_handlers[pdu->id]; |
| 4399 | } |
| 4400 | |
| 4401 | qemu_co_queue_init(&pdu->complete); |
| 4402 | co = qemu_coroutine_create(handler, pdu); |
| 4403 | qemu_coroutine_enter(co); |
| 4404 | } |
| 4405 | |
| 4406 | /* Returns 0 on success, 1 on failure. */ |
| 4407 | int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, |
| 4408 | Error **errp) |
| 4409 | { |
| 4410 | ERRP_GUARD(); |
| 4411 | int i, len; |
| 4412 | struct stat stat; |
| 4413 | FsDriverEntry *fse; |
| 4414 | V9fsPath path; |
| 4415 | int rc = 1; |
| 4416 | |
| 4417 | assert(!s->transport); |
| 4418 | s->transport = t; |
| 4419 | |
| 4420 | /* initialize pdu allocator */ |
| 4421 | QLIST_INIT(&s->free_list); |
| 4422 | QLIST_INIT(&s->active_list); |
| 4423 | for (i = 0; i < MAX_REQ; i++) { |
| 4424 | QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
| 4425 | s->pdus[i].s = s; |
| 4426 | s->pdus[i].idx = i; |
| 4427 | } |
| 4428 | |
| 4429 | v9fs_path_init(&path); |
| 4430 | |
| 4431 | fse = get_fsdev_fsentry(s->fsconf.fsdev_id); |
| 4432 | |
| 4433 | if (!fse) { |
| 4434 | /* We don't have a fsdev identified by fsdev_id */ |
| 4435 | error_setg(errp, "9pfs device couldn't find fsdev with the " |
| 4436 | "id = %s", |
| 4437 | s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); |
| 4438 | goto out; |
| 4439 | } |
| 4440 | |
| 4441 | if (!s->fsconf.tag) { |
| 4442 | /* we haven't specified a mount_tag */ |
| 4443 | error_setg(errp, "fsdev with id %s needs mount_tag arguments", |
| 4444 | s->fsconf.fsdev_id); |
| 4445 | goto out; |
| 4446 | } |
| 4447 | |
| 4448 | s->ctx.export_flags = fse->export_flags; |
| 4449 | s->ctx.fs_root = g_strdup(fse->path); |
| 4450 | s->ctx.exops.get_st_gen = NULL; |
| 4451 | len = strlen(s->fsconf.tag); |
| 4452 | if (len > MAX_TAG_LEN - 1) { |
| 4453 | error_setg(errp, "mount tag '%s' (%d bytes) is longer than " |
| 4454 | "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); |
| 4455 | goto out; |
| 4456 | } |
| 4457 | |
| 4458 | s->tag = g_strdup(s->fsconf.tag); |
| 4459 | s->ctx.uid = -1; |
| 4460 | |
| 4461 | s->ops = fse->ops; |
| 4462 | |
| 4463 | s->ctx.fmode = fse->fmode; |
| 4464 | s->ctx.dmode = fse->dmode; |
| 4465 | |
| 4466 | s->fids = g_hash_table_new(NULL, NULL); |
| 4467 | qemu_co_rwlock_init(&s->rename_lock); |
| 4468 | |
| 4469 | if (s->ops->init(&s->ctx, errp) < 0) { |
| 4470 | error_prepend(errp, "cannot initialize fsdev '%s': ", |
| 4471 | s->fsconf.fsdev_id); |
| 4472 | goto out; |
| 4473 | } |
| 4474 | |
| 4475 | /* |
| 4476 | * Check details of export path, We need to use fs driver |
| 4477 | * call back to do that. Since we are in the init path, we don't |
| 4478 | * use co-routines here. |
| 4479 | */ |
| 4480 | if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { |
| 4481 | error_setg_errno(errp, errno, "error in converting name to path"); |
| 4482 | goto out; |
| 4483 | } |
| 4484 | if (s->ops->lstat(&s->ctx, &path, &stat)) { |
| 4485 | error_setg(errp, "share path %s does not exist", fse->path); |
| 4486 | goto out; |
| 4487 | } else if (!S_ISDIR(stat.st_mode)) { |
| 4488 | error_setg(errp, "share path %s is not a directory", fse->path); |
| 4489 | goto out; |
| 4490 | } |
| 4491 | |
| 4492 | s->dev_id = stat.st_dev; |
| 4493 | |
| 4494 | /* init inode remapping : */ |
| 4495 | /* hash table for variable length inode suffixes */ |
| 4496 | qpd_table_init(&s->qpd_table); |
| 4497 | /* hash table for slow/full inode remapping (most users won't need it) */ |
| 4498 | qpf_table_init(&s->qpf_table); |
| 4499 | /* hash table for quick inode remapping */ |
| 4500 | qpp_table_init(&s->qpp_table); |
| 4501 | s->qp_ndevices = 0; |
| 4502 | s->qp_affix_next = 1; /* reserve 0 to detect overflow */ |
| 4503 | s->qp_fullpath_next = 1; |
| 4504 | |
| 4505 | s->ctx.fst = &fse->fst; |
| 4506 | fsdev_throttle_init(s->ctx.fst); |
| 4507 | |
| 4508 | s->reclaiming = false; |
| 4509 | |
| 4510 | /* init xattr FID limit from fsdev config */ |
| 4511 | s->ctx.xattr_fid_limit = fse->max_xattr; |
| 4512 | s->ctx.xattr_fid_count = 0; |
| 4513 | |
| 4514 | rc = 0; |
| 4515 | out: |
| 4516 | if (rc) { |
| 4517 | v9fs_device_unrealize_common(s); |
| 4518 | } |
| 4519 | v9fs_path_free(&path); |
| 4520 | return rc; |
| 4521 | } |
| 4522 | |
| 4523 | void v9fs_device_unrealize_common(V9fsState *s) |
| 4524 | { |
| 4525 | if (s->ops && s->ops->cleanup) { |
| 4526 | s->ops->cleanup(&s->ctx); |
| 4527 | } |
| 4528 | if (s->ctx.fst) { |
| 4529 | fsdev_throttle_cleanup(s->ctx.fst); |
| 4530 | } |
| 4531 | if (s->fids) { |
| 4532 | g_hash_table_destroy(s->fids); |
| 4533 | s->fids = NULL; |
| 4534 | } |
| 4535 | g_free(s->tag); |
| 4536 | qp_table_destroy(&s->qpd_table); |
| 4537 | qp_table_destroy(&s->qpp_table); |
| 4538 | qp_table_destroy(&s->qpf_table); |
| 4539 | g_free(s->ctx.fs_root); |
| 4540 | s->transport = NULL; |
| 4541 | } |
| 4542 | |
| 4543 | typedef struct VirtfsCoResetData { |
| 4544 | V9fsPDU pdu; |
| 4545 | bool done; |
| 4546 | } VirtfsCoResetData; |
| 4547 | |
| 4548 | static void coroutine_fn virtfs_co_reset(void *opaque) |
| 4549 | { |
| 4550 | VirtfsCoResetData *data = opaque; |
| 4551 | |
| 4552 | virtfs_reset(&data->pdu); |
| 4553 | data->done = true; |
| 4554 | } |
| 4555 | |
| 4556 | void v9fs_reset(V9fsState *s) |
| 4557 | { |
| 4558 | VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; |
| 4559 | Coroutine *co; |
| 4560 | |
| 4561 | while (!QLIST_EMPTY(&s->active_list)) { |
| 4562 | aio_poll(qemu_get_aio_context(), true); |
| 4563 | } |
| 4564 | |
| 4565 | co = qemu_coroutine_create(virtfs_co_reset, &data); |
| 4566 | qemu_coroutine_enter(co); |
| 4567 | |
| 4568 | while (!data.done) { |
| 4569 | aio_poll(qemu_get_aio_context(), true); |
| 4570 | } |
| 4571 | } |
| 4572 | |
| 4573 | static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) |
| 4574 | { |
| 4575 | struct rlimit rlim; |
| 4576 | if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { |
| 4577 | error_report("Failed to get the resource limit"); |
| 4578 | exit(1); |
| 4579 | } |
| 4580 | open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); |
| 4581 | open_fd_rc = rlim.rlim_cur / 2; |
| 4582 | } |