root / hw / 9pfs / virtio-9p-local.c @ 2c30dd74
History | View | Annotate | Download (32.5 kB)
| 1 |
/*
|
|---|---|
| 2 |
* Virtio 9p Posix callback
|
| 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 |
#include "hw/virtio.h" |
| 15 |
#include "virtio-9p.h" |
| 16 |
#include "virtio-9p-xattr.h" |
| 17 |
#include <arpa/inet.h> |
| 18 |
#include <pwd.h> |
| 19 |
#include <grp.h> |
| 20 |
#include <sys/socket.h> |
| 21 |
#include <sys/un.h> |
| 22 |
#include "qemu-xattr.h" |
| 23 |
#include <libgen.h> |
| 24 |
#include <linux/fs.h> |
| 25 |
#ifdef CONFIG_LINUX_MAGIC_H
|
| 26 |
#include <linux/magic.h> |
| 27 |
#endif
|
| 28 |
#include <sys/ioctl.h> |
| 29 |
|
| 30 |
#ifndef XFS_SUPER_MAGIC
|
| 31 |
#define XFS_SUPER_MAGIC 0x58465342 |
| 32 |
#endif
|
| 33 |
#ifndef EXT2_SUPER_MAGIC
|
| 34 |
#define EXT2_SUPER_MAGIC 0xEF53 |
| 35 |
#endif
|
| 36 |
#ifndef REISERFS_SUPER_MAGIC
|
| 37 |
#define REISERFS_SUPER_MAGIC 0x52654973 |
| 38 |
#endif
|
| 39 |
#ifndef BTRFS_SUPER_MAGIC
|
| 40 |
#define BTRFS_SUPER_MAGIC 0x9123683E |
| 41 |
#endif
|
| 42 |
|
| 43 |
#define VIRTFS_META_DIR ".virtfs_metadata" |
| 44 |
|
| 45 |
static const char *local_mapped_attr_path(FsContext *ctx, |
| 46 |
const char *path, char *buffer) |
| 47 |
{
|
| 48 |
char *dir_name;
|
| 49 |
char *tmp_path = strdup(path);
|
| 50 |
char *base_name = basename(tmp_path);
|
| 51 |
|
| 52 |
/* NULL terminate the directory */
|
| 53 |
dir_name = tmp_path; |
| 54 |
*(base_name - 1) = '\0'; |
| 55 |
|
| 56 |
snprintf(buffer, PATH_MAX, "%s/%s/%s/%s",
|
| 57 |
ctx->fs_root, dir_name, VIRTFS_META_DIR, base_name); |
| 58 |
free(tmp_path); |
| 59 |
return buffer;
|
| 60 |
} |
| 61 |
|
| 62 |
#define ATTR_MAX 100 |
| 63 |
static void local_mapped_file_attr(FsContext *ctx, const char *path, |
| 64 |
struct stat *stbuf)
|
| 65 |
{
|
| 66 |
FILE *fp; |
| 67 |
char buf[ATTR_MAX];
|
| 68 |
char attr_path[PATH_MAX];
|
| 69 |
|
| 70 |
local_mapped_attr_path(ctx, path, attr_path); |
| 71 |
fp = fopen(attr_path, "r");
|
| 72 |
if (!fp) {
|
| 73 |
return;
|
| 74 |
} |
| 75 |
memset(buf, 0, ATTR_MAX);
|
| 76 |
while (fgets(buf, ATTR_MAX, fp)) {
|
| 77 |
if (!strncmp(buf, "virtfs.uid", 10)) { |
| 78 |
stbuf->st_uid = atoi(buf+11);
|
| 79 |
} else if (!strncmp(buf, "virtfs.gid", 10)) { |
| 80 |
stbuf->st_gid = atoi(buf+11);
|
| 81 |
} else if (!strncmp(buf, "virtfs.mode", 11)) { |
| 82 |
stbuf->st_mode = atoi(buf+12);
|
| 83 |
} else if (!strncmp(buf, "virtfs.rdev", 11)) { |
| 84 |
stbuf->st_rdev = atoi(buf+12);
|
| 85 |
} |
| 86 |
memset(buf, 0, ATTR_MAX);
|
| 87 |
} |
| 88 |
fclose(fp); |
| 89 |
} |
| 90 |
|
| 91 |
static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf) |
| 92 |
{
|
| 93 |
int err;
|
| 94 |
char buffer[PATH_MAX];
|
| 95 |
char *path = fs_path->data;
|
| 96 |
|
| 97 |
err = lstat(rpath(fs_ctx, path, buffer), stbuf); |
| 98 |
if (err) {
|
| 99 |
return err;
|
| 100 |
} |
| 101 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 102 |
/* Actual credentials are part of extended attrs */
|
| 103 |
uid_t tmp_uid; |
| 104 |
gid_t tmp_gid; |
| 105 |
mode_t tmp_mode; |
| 106 |
dev_t tmp_dev; |
| 107 |
if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.uid", &tmp_uid, |
| 108 |
sizeof(uid_t)) > 0) { |
| 109 |
stbuf->st_uid = tmp_uid; |
| 110 |
} |
| 111 |
if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.gid", &tmp_gid, |
| 112 |
sizeof(gid_t)) > 0) { |
| 113 |
stbuf->st_gid = tmp_gid; |
| 114 |
} |
| 115 |
if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.mode", |
| 116 |
&tmp_mode, sizeof(mode_t)) > 0) { |
| 117 |
stbuf->st_mode = tmp_mode; |
| 118 |
} |
| 119 |
if (getxattr(rpath(fs_ctx, path, buffer), "user.virtfs.rdev", &tmp_dev, |
| 120 |
sizeof(dev_t)) > 0) { |
| 121 |
stbuf->st_rdev = tmp_dev; |
| 122 |
} |
| 123 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 124 |
local_mapped_file_attr(fs_ctx, path, stbuf); |
| 125 |
} |
| 126 |
return err;
|
| 127 |
} |
| 128 |
|
| 129 |
static int local_create_mapped_attr_dir(FsContext *ctx, const char *path) |
| 130 |
{
|
| 131 |
int err;
|
| 132 |
char attr_dir[PATH_MAX];
|
| 133 |
char *tmp_path = strdup(path);
|
| 134 |
|
| 135 |
snprintf(attr_dir, PATH_MAX, "%s/%s/%s",
|
| 136 |
ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR); |
| 137 |
|
| 138 |
err = mkdir(attr_dir, 0700);
|
| 139 |
if (err < 0 && errno == EEXIST) { |
| 140 |
err = 0;
|
| 141 |
} |
| 142 |
free(tmp_path); |
| 143 |
return err;
|
| 144 |
} |
| 145 |
|
| 146 |
static int local_set_mapped_file_attr(FsContext *ctx, |
| 147 |
const char *path, FsCred *credp) |
| 148 |
{
|
| 149 |
FILE *fp; |
| 150 |
int ret = 0; |
| 151 |
char buf[ATTR_MAX];
|
| 152 |
char attr_path[PATH_MAX];
|
| 153 |
int uid = -1, gid = -1, mode = -1, rdev = -1; |
| 154 |
|
| 155 |
fp = fopen(local_mapped_attr_path(ctx, path, attr_path), "r");
|
| 156 |
if (!fp) {
|
| 157 |
goto create_map_file;
|
| 158 |
} |
| 159 |
memset(buf, 0, ATTR_MAX);
|
| 160 |
while (fgets(buf, ATTR_MAX, fp)) {
|
| 161 |
if (!strncmp(buf, "virtfs.uid", 10)) { |
| 162 |
uid = atoi(buf+11);
|
| 163 |
} else if (!strncmp(buf, "virtfs.gid", 10)) { |
| 164 |
gid = atoi(buf+11);
|
| 165 |
} else if (!strncmp(buf, "virtfs.mode", 11)) { |
| 166 |
mode = atoi(buf+12);
|
| 167 |
} else if (!strncmp(buf, "virtfs.rdev", 11)) { |
| 168 |
rdev = atoi(buf+12);
|
| 169 |
} |
| 170 |
memset(buf, 0, ATTR_MAX);
|
| 171 |
} |
| 172 |
fclose(fp); |
| 173 |
goto update_map_file;
|
| 174 |
|
| 175 |
create_map_file:
|
| 176 |
ret = local_create_mapped_attr_dir(ctx, path); |
| 177 |
if (ret < 0) { |
| 178 |
goto err_out;
|
| 179 |
} |
| 180 |
|
| 181 |
update_map_file:
|
| 182 |
fp = fopen(attr_path, "w");
|
| 183 |
if (!fp) {
|
| 184 |
ret = -1;
|
| 185 |
goto err_out;
|
| 186 |
} |
| 187 |
|
| 188 |
if (credp->fc_uid != -1) { |
| 189 |
uid = credp->fc_uid; |
| 190 |
} |
| 191 |
if (credp->fc_gid != -1) { |
| 192 |
gid = credp->fc_gid; |
| 193 |
} |
| 194 |
if (credp->fc_mode != -1) { |
| 195 |
mode = credp->fc_mode; |
| 196 |
} |
| 197 |
if (credp->fc_rdev != -1) { |
| 198 |
rdev = credp->fc_rdev; |
| 199 |
} |
| 200 |
|
| 201 |
|
| 202 |
if (uid != -1) { |
| 203 |
fprintf(fp, "virtfs.uid=%d\n", uid);
|
| 204 |
} |
| 205 |
if (gid != -1) { |
| 206 |
fprintf(fp, "virtfs.gid=%d\n", gid);
|
| 207 |
} |
| 208 |
if (mode != -1) { |
| 209 |
fprintf(fp, "virtfs.mode=%d\n", mode);
|
| 210 |
} |
| 211 |
if (rdev != -1) { |
| 212 |
fprintf(fp, "virtfs.rdev=%d\n", rdev);
|
| 213 |
} |
| 214 |
fclose(fp); |
| 215 |
|
| 216 |
err_out:
|
| 217 |
return ret;
|
| 218 |
} |
| 219 |
|
| 220 |
static int local_set_xattr(const char *path, FsCred *credp) |
| 221 |
{
|
| 222 |
int err;
|
| 223 |
|
| 224 |
if (credp->fc_uid != -1) { |
| 225 |
err = setxattr(path, "user.virtfs.uid", &credp->fc_uid, sizeof(uid_t), |
| 226 |
0);
|
| 227 |
if (err) {
|
| 228 |
return err;
|
| 229 |
} |
| 230 |
} |
| 231 |
if (credp->fc_gid != -1) { |
| 232 |
err = setxattr(path, "user.virtfs.gid", &credp->fc_gid, sizeof(gid_t), |
| 233 |
0);
|
| 234 |
if (err) {
|
| 235 |
return err;
|
| 236 |
} |
| 237 |
} |
| 238 |
if (credp->fc_mode != -1) { |
| 239 |
err = setxattr(path, "user.virtfs.mode", &credp->fc_mode,
|
| 240 |
sizeof(mode_t), 0); |
| 241 |
if (err) {
|
| 242 |
return err;
|
| 243 |
} |
| 244 |
} |
| 245 |
if (credp->fc_rdev != -1) { |
| 246 |
err = setxattr(path, "user.virtfs.rdev", &credp->fc_rdev,
|
| 247 |
sizeof(dev_t), 0); |
| 248 |
if (err) {
|
| 249 |
return err;
|
| 250 |
} |
| 251 |
} |
| 252 |
return 0; |
| 253 |
} |
| 254 |
|
| 255 |
static int local_post_create_passthrough(FsContext *fs_ctx, const char *path, |
| 256 |
FsCred *credp) |
| 257 |
{
|
| 258 |
char buffer[PATH_MAX];
|
| 259 |
|
| 260 |
if (chmod(rpath(fs_ctx, path, buffer), credp->fc_mode & 07777) < 0) { |
| 261 |
return -1; |
| 262 |
} |
| 263 |
if (lchown(rpath(fs_ctx, path, buffer), credp->fc_uid,
|
| 264 |
credp->fc_gid) < 0) {
|
| 265 |
/*
|
| 266 |
* If we fail to change ownership and if we are
|
| 267 |
* using security model none. Ignore the error
|
| 268 |
*/
|
| 269 |
if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
|
| 270 |
return -1; |
| 271 |
} |
| 272 |
} |
| 273 |
return 0; |
| 274 |
} |
| 275 |
|
| 276 |
static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
|
| 277 |
char *buf, size_t bufsz)
|
| 278 |
{
|
| 279 |
ssize_t tsize = -1;
|
| 280 |
char buffer[PATH_MAX];
|
| 281 |
char *path = fs_path->data;
|
| 282 |
|
| 283 |
if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
|
| 284 |
(fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
|
| 285 |
int fd;
|
| 286 |
fd = open(rpath(fs_ctx, path, buffer), O_RDONLY); |
| 287 |
if (fd == -1) { |
| 288 |
return -1; |
| 289 |
} |
| 290 |
do {
|
| 291 |
tsize = read(fd, (void *)buf, bufsz);
|
| 292 |
} while (tsize == -1 && errno == EINTR); |
| 293 |
close(fd); |
| 294 |
return tsize;
|
| 295 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 296 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 297 |
tsize = readlink(rpath(fs_ctx, path, buffer), buf, bufsz); |
| 298 |
} |
| 299 |
return tsize;
|
| 300 |
} |
| 301 |
|
| 302 |
static int local_close(FsContext *ctx, V9fsFidOpenState *fs) |
| 303 |
{
|
| 304 |
return close(fs->fd);
|
| 305 |
} |
| 306 |
|
| 307 |
static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs) |
| 308 |
{
|
| 309 |
return closedir(fs->dir);
|
| 310 |
} |
| 311 |
|
| 312 |
static int local_open(FsContext *ctx, V9fsPath *fs_path, |
| 313 |
int flags, V9fsFidOpenState *fs)
|
| 314 |
{
|
| 315 |
char buffer[PATH_MAX];
|
| 316 |
char *path = fs_path->data;
|
| 317 |
|
| 318 |
fs->fd = open(rpath(ctx, path, buffer), flags); |
| 319 |
return fs->fd;
|
| 320 |
} |
| 321 |
|
| 322 |
static int local_opendir(FsContext *ctx, |
| 323 |
V9fsPath *fs_path, V9fsFidOpenState *fs) |
| 324 |
{
|
| 325 |
char buffer[PATH_MAX];
|
| 326 |
char *path = fs_path->data;
|
| 327 |
|
| 328 |
fs->dir = opendir(rpath(ctx, path, buffer)); |
| 329 |
if (!fs->dir) {
|
| 330 |
return -1; |
| 331 |
} |
| 332 |
return 0; |
| 333 |
} |
| 334 |
|
| 335 |
static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) |
| 336 |
{
|
| 337 |
return rewinddir(fs->dir);
|
| 338 |
} |
| 339 |
|
| 340 |
static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
|
| 341 |
{
|
| 342 |
return telldir(fs->dir);
|
| 343 |
} |
| 344 |
|
| 345 |
static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, |
| 346 |
struct dirent *entry,
|
| 347 |
struct dirent **result)
|
| 348 |
{
|
| 349 |
int ret;
|
| 350 |
|
| 351 |
again:
|
| 352 |
ret = readdir_r(fs->dir, entry, result); |
| 353 |
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
| 354 |
if (!ret && *result != NULL && |
| 355 |
!strcmp(entry->d_name, VIRTFS_META_DIR)) {
|
| 356 |
/* skp the meta data directory */
|
| 357 |
goto again;
|
| 358 |
} |
| 359 |
} |
| 360 |
return ret;
|
| 361 |
} |
| 362 |
|
| 363 |
static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) |
| 364 |
{
|
| 365 |
return seekdir(fs->dir, off);
|
| 366 |
} |
| 367 |
|
| 368 |
static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
|
| 369 |
const struct iovec *iov, |
| 370 |
int iovcnt, off_t offset)
|
| 371 |
{
|
| 372 |
#ifdef CONFIG_PREADV
|
| 373 |
return preadv(fs->fd, iov, iovcnt, offset);
|
| 374 |
#else
|
| 375 |
int err = lseek(fs->fd, offset, SEEK_SET);
|
| 376 |
if (err == -1) { |
| 377 |
return err;
|
| 378 |
} else {
|
| 379 |
return readv(fs->fd, iov, iovcnt);
|
| 380 |
} |
| 381 |
#endif
|
| 382 |
} |
| 383 |
|
| 384 |
static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
|
| 385 |
const struct iovec *iov, |
| 386 |
int iovcnt, off_t offset)
|
| 387 |
{
|
| 388 |
ssize_t ret |
| 389 |
; |
| 390 |
#ifdef CONFIG_PREADV
|
| 391 |
ret = pwritev(fs->fd, iov, iovcnt, offset); |
| 392 |
#else
|
| 393 |
int err = lseek(fs->fd, offset, SEEK_SET);
|
| 394 |
if (err == -1) { |
| 395 |
return err;
|
| 396 |
} else {
|
| 397 |
ret = writev(fs->fd, iov, iovcnt); |
| 398 |
} |
| 399 |
#endif
|
| 400 |
#ifdef CONFIG_SYNC_FILE_RANGE
|
| 401 |
if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) { |
| 402 |
/*
|
| 403 |
* Initiate a writeback. This is not a data integrity sync.
|
| 404 |
* We want to ensure that we don't leave dirty pages in the cache
|
| 405 |
* after write when writeout=immediate is sepcified.
|
| 406 |
*/
|
| 407 |
sync_file_range(fs->fd, offset, ret, |
| 408 |
SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE); |
| 409 |
} |
| 410 |
#endif
|
| 411 |
return ret;
|
| 412 |
} |
| 413 |
|
| 414 |
static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) |
| 415 |
{
|
| 416 |
char buffer[PATH_MAX];
|
| 417 |
char *path = fs_path->data;
|
| 418 |
|
| 419 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 420 |
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
|
| 421 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 422 |
return local_set_mapped_file_attr(fs_ctx, path, credp);
|
| 423 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 424 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 425 |
return chmod(rpath(fs_ctx, path, buffer), credp->fc_mode);
|
| 426 |
} |
| 427 |
return -1; |
| 428 |
} |
| 429 |
|
| 430 |
static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path, |
| 431 |
const char *name, FsCred *credp) |
| 432 |
{
|
| 433 |
char *path;
|
| 434 |
int err = -1; |
| 435 |
int serrno = 0; |
| 436 |
V9fsString fullname; |
| 437 |
char buffer[PATH_MAX];
|
| 438 |
|
| 439 |
v9fs_string_init(&fullname); |
| 440 |
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
| 441 |
path = fullname.data; |
| 442 |
|
| 443 |
/* Determine the security model */
|
| 444 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 445 |
err = mknod(rpath(fs_ctx, path, buffer), |
| 446 |
SM_LOCAL_MODE_BITS|S_IFREG, 0);
|
| 447 |
if (err == -1) { |
| 448 |
goto out;
|
| 449 |
} |
| 450 |
err = local_set_xattr(rpath(fs_ctx, path, buffer), credp); |
| 451 |
if (err == -1) { |
| 452 |
serrno = errno; |
| 453 |
goto err_end;
|
| 454 |
} |
| 455 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 456 |
|
| 457 |
err = mknod(rpath(fs_ctx, path, buffer), |
| 458 |
SM_LOCAL_MODE_BITS|S_IFREG, 0);
|
| 459 |
if (err == -1) { |
| 460 |
goto out;
|
| 461 |
} |
| 462 |
err = local_set_mapped_file_attr(fs_ctx, path, credp); |
| 463 |
if (err == -1) { |
| 464 |
serrno = errno; |
| 465 |
goto err_end;
|
| 466 |
} |
| 467 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 468 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 469 |
err = mknod(rpath(fs_ctx, path, buffer), credp->fc_mode, |
| 470 |
credp->fc_rdev); |
| 471 |
if (err == -1) { |
| 472 |
goto out;
|
| 473 |
} |
| 474 |
err = local_post_create_passthrough(fs_ctx, path, credp); |
| 475 |
if (err == -1) { |
| 476 |
serrno = errno; |
| 477 |
goto err_end;
|
| 478 |
} |
| 479 |
} |
| 480 |
goto out;
|
| 481 |
|
| 482 |
err_end:
|
| 483 |
remove(rpath(fs_ctx, path, buffer)); |
| 484 |
errno = serrno; |
| 485 |
out:
|
| 486 |
v9fs_string_free(&fullname); |
| 487 |
return err;
|
| 488 |
} |
| 489 |
|
| 490 |
static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path, |
| 491 |
const char *name, FsCred *credp) |
| 492 |
{
|
| 493 |
char *path;
|
| 494 |
int err = -1; |
| 495 |
int serrno = 0; |
| 496 |
V9fsString fullname; |
| 497 |
char buffer[PATH_MAX];
|
| 498 |
|
| 499 |
v9fs_string_init(&fullname); |
| 500 |
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
| 501 |
path = fullname.data; |
| 502 |
|
| 503 |
/* Determine the security model */
|
| 504 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 505 |
err = mkdir(rpath(fs_ctx, path, buffer), SM_LOCAL_DIR_MODE_BITS); |
| 506 |
if (err == -1) { |
| 507 |
goto out;
|
| 508 |
} |
| 509 |
credp->fc_mode = credp->fc_mode|S_IFDIR; |
| 510 |
err = local_set_xattr(rpath(fs_ctx, path, buffer), credp); |
| 511 |
if (err == -1) { |
| 512 |
serrno = errno; |
| 513 |
goto err_end;
|
| 514 |
} |
| 515 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 516 |
err = mkdir(rpath(fs_ctx, path, buffer), SM_LOCAL_DIR_MODE_BITS); |
| 517 |
if (err == -1) { |
| 518 |
goto out;
|
| 519 |
} |
| 520 |
credp->fc_mode = credp->fc_mode|S_IFDIR; |
| 521 |
err = local_set_mapped_file_attr(fs_ctx, path, credp); |
| 522 |
if (err == -1) { |
| 523 |
serrno = errno; |
| 524 |
goto err_end;
|
| 525 |
} |
| 526 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 527 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 528 |
err = mkdir(rpath(fs_ctx, path, buffer), credp->fc_mode); |
| 529 |
if (err == -1) { |
| 530 |
goto out;
|
| 531 |
} |
| 532 |
err = local_post_create_passthrough(fs_ctx, path, credp); |
| 533 |
if (err == -1) { |
| 534 |
serrno = errno; |
| 535 |
goto err_end;
|
| 536 |
} |
| 537 |
} |
| 538 |
goto out;
|
| 539 |
|
| 540 |
err_end:
|
| 541 |
remove(rpath(fs_ctx, path, buffer)); |
| 542 |
errno = serrno; |
| 543 |
out:
|
| 544 |
v9fs_string_free(&fullname); |
| 545 |
return err;
|
| 546 |
} |
| 547 |
|
| 548 |
static int local_fstat(FsContext *fs_ctx, int fid_type, |
| 549 |
V9fsFidOpenState *fs, struct stat *stbuf)
|
| 550 |
{
|
| 551 |
int err, fd;
|
| 552 |
|
| 553 |
if (fid_type == P9_FID_DIR) {
|
| 554 |
fd = dirfd(fs->dir); |
| 555 |
} else {
|
| 556 |
fd = fs->fd; |
| 557 |
} |
| 558 |
|
| 559 |
err = fstat(fd, stbuf); |
| 560 |
if (err) {
|
| 561 |
return err;
|
| 562 |
} |
| 563 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 564 |
/* Actual credentials are part of extended attrs */
|
| 565 |
uid_t tmp_uid; |
| 566 |
gid_t tmp_gid; |
| 567 |
mode_t tmp_mode; |
| 568 |
dev_t tmp_dev; |
| 569 |
|
| 570 |
if (fgetxattr(fd, "user.virtfs.uid", |
| 571 |
&tmp_uid, sizeof(uid_t)) > 0) { |
| 572 |
stbuf->st_uid = tmp_uid; |
| 573 |
} |
| 574 |
if (fgetxattr(fd, "user.virtfs.gid", |
| 575 |
&tmp_gid, sizeof(gid_t)) > 0) { |
| 576 |
stbuf->st_gid = tmp_gid; |
| 577 |
} |
| 578 |
if (fgetxattr(fd, "user.virtfs.mode", |
| 579 |
&tmp_mode, sizeof(mode_t)) > 0) { |
| 580 |
stbuf->st_mode = tmp_mode; |
| 581 |
} |
| 582 |
if (fgetxattr(fd, "user.virtfs.rdev", |
| 583 |
&tmp_dev, sizeof(dev_t)) > 0) { |
| 584 |
stbuf->st_rdev = tmp_dev; |
| 585 |
} |
| 586 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 587 |
errno = EOPNOTSUPP; |
| 588 |
return -1; |
| 589 |
} |
| 590 |
return err;
|
| 591 |
} |
| 592 |
|
| 593 |
static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name, |
| 594 |
int flags, FsCred *credp, V9fsFidOpenState *fs)
|
| 595 |
{
|
| 596 |
char *path;
|
| 597 |
int fd = -1; |
| 598 |
int err = -1; |
| 599 |
int serrno = 0; |
| 600 |
V9fsString fullname; |
| 601 |
char buffer[PATH_MAX];
|
| 602 |
|
| 603 |
v9fs_string_init(&fullname); |
| 604 |
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
| 605 |
path = fullname.data; |
| 606 |
|
| 607 |
/* Determine the security model */
|
| 608 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 609 |
fd = open(rpath(fs_ctx, path, buffer), flags, SM_LOCAL_MODE_BITS); |
| 610 |
if (fd == -1) { |
| 611 |
err = fd; |
| 612 |
goto out;
|
| 613 |
} |
| 614 |
credp->fc_mode = credp->fc_mode|S_IFREG; |
| 615 |
/* Set cleint credentials in xattr */
|
| 616 |
err = local_set_xattr(rpath(fs_ctx, path, buffer), credp); |
| 617 |
if (err == -1) { |
| 618 |
serrno = errno; |
| 619 |
goto err_end;
|
| 620 |
} |
| 621 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 622 |
fd = open(rpath(fs_ctx, path, buffer), flags, SM_LOCAL_MODE_BITS); |
| 623 |
if (fd == -1) { |
| 624 |
err = fd; |
| 625 |
goto out;
|
| 626 |
} |
| 627 |
credp->fc_mode = credp->fc_mode|S_IFREG; |
| 628 |
/* Set client credentials in .virtfs_metadata directory files */
|
| 629 |
err = local_set_mapped_file_attr(fs_ctx, path, credp); |
| 630 |
if (err == -1) { |
| 631 |
serrno = errno; |
| 632 |
goto err_end;
|
| 633 |
} |
| 634 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 635 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 636 |
fd = open(rpath(fs_ctx, path, buffer), flags, credp->fc_mode); |
| 637 |
if (fd == -1) { |
| 638 |
err = fd; |
| 639 |
goto out;
|
| 640 |
} |
| 641 |
err = local_post_create_passthrough(fs_ctx, path, credp); |
| 642 |
if (err == -1) { |
| 643 |
serrno = errno; |
| 644 |
goto err_end;
|
| 645 |
} |
| 646 |
} |
| 647 |
err = fd; |
| 648 |
fs->fd = fd; |
| 649 |
goto out;
|
| 650 |
|
| 651 |
err_end:
|
| 652 |
close(fd); |
| 653 |
remove(rpath(fs_ctx, path, buffer)); |
| 654 |
errno = serrno; |
| 655 |
out:
|
| 656 |
v9fs_string_free(&fullname); |
| 657 |
return err;
|
| 658 |
} |
| 659 |
|
| 660 |
|
| 661 |
static int local_symlink(FsContext *fs_ctx, const char *oldpath, |
| 662 |
V9fsPath *dir_path, const char *name, FsCred *credp) |
| 663 |
{
|
| 664 |
int err = -1; |
| 665 |
int serrno = 0; |
| 666 |
char *newpath;
|
| 667 |
V9fsString fullname; |
| 668 |
char buffer[PATH_MAX];
|
| 669 |
|
| 670 |
v9fs_string_init(&fullname); |
| 671 |
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
| 672 |
newpath = fullname.data; |
| 673 |
|
| 674 |
/* Determine the security model */
|
| 675 |
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
|
| 676 |
int fd;
|
| 677 |
ssize_t oldpath_size, write_size; |
| 678 |
fd = open(rpath(fs_ctx, newpath, buffer), O_CREAT|O_EXCL|O_RDWR, |
| 679 |
SM_LOCAL_MODE_BITS); |
| 680 |
if (fd == -1) { |
| 681 |
err = fd; |
| 682 |
goto out;
|
| 683 |
} |
| 684 |
/* Write the oldpath (target) to the file. */
|
| 685 |
oldpath_size = strlen(oldpath); |
| 686 |
do {
|
| 687 |
write_size = write(fd, (void *)oldpath, oldpath_size);
|
| 688 |
} while (write_size == -1 && errno == EINTR); |
| 689 |
|
| 690 |
if (write_size != oldpath_size) {
|
| 691 |
serrno = errno; |
| 692 |
close(fd); |
| 693 |
err = -1;
|
| 694 |
goto err_end;
|
| 695 |
} |
| 696 |
close(fd); |
| 697 |
/* Set cleint credentials in symlink's xattr */
|
| 698 |
credp->fc_mode = credp->fc_mode|S_IFLNK; |
| 699 |
err = local_set_xattr(rpath(fs_ctx, newpath, buffer), credp); |
| 700 |
if (err == -1) { |
| 701 |
serrno = errno; |
| 702 |
goto err_end;
|
| 703 |
} |
| 704 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 705 |
int fd;
|
| 706 |
ssize_t oldpath_size, write_size; |
| 707 |
fd = open(rpath(fs_ctx, newpath, buffer), O_CREAT|O_EXCL|O_RDWR, |
| 708 |
SM_LOCAL_MODE_BITS); |
| 709 |
if (fd == -1) { |
| 710 |
err = fd; |
| 711 |
goto out;
|
| 712 |
} |
| 713 |
/* Write the oldpath (target) to the file. */
|
| 714 |
oldpath_size = strlen(oldpath); |
| 715 |
do {
|
| 716 |
write_size = write(fd, (void *)oldpath, oldpath_size);
|
| 717 |
} while (write_size == -1 && errno == EINTR); |
| 718 |
|
| 719 |
if (write_size != oldpath_size) {
|
| 720 |
serrno = errno; |
| 721 |
close(fd); |
| 722 |
err = -1;
|
| 723 |
goto err_end;
|
| 724 |
} |
| 725 |
close(fd); |
| 726 |
/* Set cleint credentials in symlink's xattr */
|
| 727 |
credp->fc_mode = credp->fc_mode|S_IFLNK; |
| 728 |
err = local_set_mapped_file_attr(fs_ctx, newpath, credp); |
| 729 |
if (err == -1) { |
| 730 |
serrno = errno; |
| 731 |
goto err_end;
|
| 732 |
} |
| 733 |
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 734 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 735 |
err = symlink(oldpath, rpath(fs_ctx, newpath, buffer)); |
| 736 |
if (err) {
|
| 737 |
goto out;
|
| 738 |
} |
| 739 |
err = lchown(rpath(fs_ctx, newpath, buffer), credp->fc_uid, |
| 740 |
credp->fc_gid); |
| 741 |
if (err == -1) { |
| 742 |
/*
|
| 743 |
* If we fail to change ownership and if we are
|
| 744 |
* using security model none. Ignore the error
|
| 745 |
*/
|
| 746 |
if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
|
| 747 |
serrno = errno; |
| 748 |
goto err_end;
|
| 749 |
} else
|
| 750 |
err = 0;
|
| 751 |
} |
| 752 |
} |
| 753 |
goto out;
|
| 754 |
|
| 755 |
err_end:
|
| 756 |
remove(rpath(fs_ctx, newpath, buffer)); |
| 757 |
errno = serrno; |
| 758 |
out:
|
| 759 |
v9fs_string_free(&fullname); |
| 760 |
return err;
|
| 761 |
} |
| 762 |
|
| 763 |
static int local_link(FsContext *ctx, V9fsPath *oldpath, |
| 764 |
V9fsPath *dirpath, const char *name) |
| 765 |
{
|
| 766 |
int ret;
|
| 767 |
V9fsString newpath; |
| 768 |
char buffer[PATH_MAX], buffer1[PATH_MAX];
|
| 769 |
|
| 770 |
v9fs_string_init(&newpath); |
| 771 |
v9fs_string_sprintf(&newpath, "%s/%s", dirpath->data, name);
|
| 772 |
|
| 773 |
ret = link(rpath(ctx, oldpath->data, buffer), |
| 774 |
rpath(ctx, newpath.data, buffer1)); |
| 775 |
|
| 776 |
/* now link the virtfs_metadata files */
|
| 777 |
if (!ret && (ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
|
| 778 |
/* Link the .virtfs_metadata files. Create the metada directory */
|
| 779 |
ret = local_create_mapped_attr_dir(ctx, newpath.data); |
| 780 |
if (ret < 0) { |
| 781 |
goto err_out;
|
| 782 |
} |
| 783 |
ret = link(local_mapped_attr_path(ctx, oldpath->data, buffer), |
| 784 |
local_mapped_attr_path(ctx, newpath.data, buffer1)); |
| 785 |
if (ret < 0 && errno != ENOENT) { |
| 786 |
goto err_out;
|
| 787 |
} |
| 788 |
} |
| 789 |
err_out:
|
| 790 |
v9fs_string_free(&newpath); |
| 791 |
return ret;
|
| 792 |
} |
| 793 |
|
| 794 |
static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size) |
| 795 |
{
|
| 796 |
char buffer[PATH_MAX];
|
| 797 |
char *path = fs_path->data;
|
| 798 |
|
| 799 |
return truncate(rpath(ctx, path, buffer), size);
|
| 800 |
} |
| 801 |
|
| 802 |
static int local_rename(FsContext *ctx, const char *oldpath, |
| 803 |
const char *newpath) |
| 804 |
{
|
| 805 |
int err;
|
| 806 |
char buffer[PATH_MAX], buffer1[PATH_MAX];
|
| 807 |
|
| 808 |
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
| 809 |
err = local_create_mapped_attr_dir(ctx, newpath); |
| 810 |
if (err < 0) { |
| 811 |
return err;
|
| 812 |
} |
| 813 |
/* rename the .virtfs_metadata files */
|
| 814 |
err = rename(local_mapped_attr_path(ctx, oldpath, buffer), |
| 815 |
local_mapped_attr_path(ctx, newpath, buffer1)); |
| 816 |
if (err < 0 && errno != ENOENT) { |
| 817 |
return err;
|
| 818 |
} |
| 819 |
} |
| 820 |
return rename(rpath(ctx, oldpath, buffer), rpath(ctx, newpath, buffer1));
|
| 821 |
} |
| 822 |
|
| 823 |
static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) |
| 824 |
{
|
| 825 |
char buffer[PATH_MAX];
|
| 826 |
char *path = fs_path->data;
|
| 827 |
|
| 828 |
if ((credp->fc_uid == -1 && credp->fc_gid == -1) || |
| 829 |
(fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || |
| 830 |
(fs_ctx->export_flags & V9FS_SM_NONE)) {
|
| 831 |
return lchown(rpath(fs_ctx, path, buffer),
|
| 832 |
credp->fc_uid, credp->fc_gid); |
| 833 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED) { |
| 834 |
return local_set_xattr(rpath(fs_ctx, path, buffer), credp);
|
| 835 |
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 836 |
return local_set_mapped_file_attr(fs_ctx, path, credp);
|
| 837 |
} |
| 838 |
return -1; |
| 839 |
} |
| 840 |
|
| 841 |
static int local_utimensat(FsContext *s, V9fsPath *fs_path, |
| 842 |
const struct timespec *buf) |
| 843 |
{
|
| 844 |
char buffer[PATH_MAX];
|
| 845 |
char *path = fs_path->data;
|
| 846 |
|
| 847 |
return qemu_utimens(rpath(s, path, buffer), buf);
|
| 848 |
} |
| 849 |
|
| 850 |
static int local_remove(FsContext *ctx, const char *path) |
| 851 |
{
|
| 852 |
int err;
|
| 853 |
struct stat stbuf;
|
| 854 |
char buffer[PATH_MAX];
|
| 855 |
|
| 856 |
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
| 857 |
err = lstat(rpath(ctx, path, buffer), &stbuf); |
| 858 |
if (err) {
|
| 859 |
goto err_out;
|
| 860 |
} |
| 861 |
/*
|
| 862 |
* If directory remove .virtfs_metadata contained in the
|
| 863 |
* directory
|
| 864 |
*/
|
| 865 |
if (S_ISDIR(stbuf.st_mode)) {
|
| 866 |
sprintf(buffer, "%s/%s/%s", ctx->fs_root, path, VIRTFS_META_DIR);
|
| 867 |
err = remove(buffer); |
| 868 |
if (err < 0 && errno != ENOENT) { |
| 869 |
/*
|
| 870 |
* We didn't had the .virtfs_metadata file. May be file created
|
| 871 |
* in non-mapped mode ?. Ignore ENOENT.
|
| 872 |
*/
|
| 873 |
goto err_out;
|
| 874 |
} |
| 875 |
} |
| 876 |
/*
|
| 877 |
* Now remove the name from parent directory
|
| 878 |
* .virtfs_metadata directory
|
| 879 |
*/
|
| 880 |
err = remove(local_mapped_attr_path(ctx, path, buffer));; |
| 881 |
if (err < 0 && errno != ENOENT) { |
| 882 |
/*
|
| 883 |
* We didn't had the .virtfs_metadata file. May be file created
|
| 884 |
* in non-mapped mode ?. Ignore ENOENT.
|
| 885 |
*/
|
| 886 |
goto err_out;
|
| 887 |
} |
| 888 |
} |
| 889 |
return remove(rpath(ctx, path, buffer));
|
| 890 |
err_out:
|
| 891 |
return err;
|
| 892 |
} |
| 893 |
|
| 894 |
static int local_fsync(FsContext *ctx, int fid_type, |
| 895 |
V9fsFidOpenState *fs, int datasync)
|
| 896 |
{
|
| 897 |
int fd;
|
| 898 |
|
| 899 |
if (fid_type == P9_FID_DIR) {
|
| 900 |
fd = dirfd(fs->dir); |
| 901 |
} else {
|
| 902 |
fd = fs->fd; |
| 903 |
} |
| 904 |
|
| 905 |
if (datasync) {
|
| 906 |
return qemu_fdatasync(fd);
|
| 907 |
} else {
|
| 908 |
return fsync(fd);
|
| 909 |
} |
| 910 |
} |
| 911 |
|
| 912 |
static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf) |
| 913 |
{
|
| 914 |
char buffer[PATH_MAX];
|
| 915 |
char *path = fs_path->data;
|
| 916 |
|
| 917 |
return statfs(rpath(s, path, buffer), stbuf);
|
| 918 |
} |
| 919 |
|
| 920 |
static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
|
| 921 |
const char *name, void *value, size_t size) |
| 922 |
{
|
| 923 |
char *path = fs_path->data;
|
| 924 |
|
| 925 |
return v9fs_get_xattr(ctx, path, name, value, size);
|
| 926 |
} |
| 927 |
|
| 928 |
static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path,
|
| 929 |
void *value, size_t size)
|
| 930 |
{
|
| 931 |
char *path = fs_path->data;
|
| 932 |
|
| 933 |
return v9fs_list_xattr(ctx, path, value, size);
|
| 934 |
} |
| 935 |
|
| 936 |
static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name, |
| 937 |
void *value, size_t size, int flags) |
| 938 |
{
|
| 939 |
char *path = fs_path->data;
|
| 940 |
|
| 941 |
return v9fs_set_xattr(ctx, path, name, value, size, flags);
|
| 942 |
} |
| 943 |
|
| 944 |
static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path, |
| 945 |
const char *name) |
| 946 |
{
|
| 947 |
char *path = fs_path->data;
|
| 948 |
|
| 949 |
return v9fs_remove_xattr(ctx, path, name);
|
| 950 |
} |
| 951 |
|
| 952 |
static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path, |
| 953 |
const char *name, V9fsPath *target) |
| 954 |
{
|
| 955 |
if (dir_path) {
|
| 956 |
v9fs_string_sprintf((V9fsString *)target, "%s/%s",
|
| 957 |
dir_path->data, name); |
| 958 |
} else {
|
| 959 |
v9fs_string_sprintf((V9fsString *)target, "%s", name);
|
| 960 |
} |
| 961 |
/* Bump the size for including terminating NULL */
|
| 962 |
target->size++; |
| 963 |
return 0; |
| 964 |
} |
| 965 |
|
| 966 |
static int local_renameat(FsContext *ctx, V9fsPath *olddir, |
| 967 |
const char *old_name, V9fsPath *newdir, |
| 968 |
const char *new_name) |
| 969 |
{
|
| 970 |
int ret;
|
| 971 |
V9fsString old_full_name, new_full_name; |
| 972 |
|
| 973 |
v9fs_string_init(&old_full_name); |
| 974 |
v9fs_string_init(&new_full_name); |
| 975 |
|
| 976 |
v9fs_string_sprintf(&old_full_name, "%s/%s", olddir->data, old_name);
|
| 977 |
v9fs_string_sprintf(&new_full_name, "%s/%s", newdir->data, new_name);
|
| 978 |
|
| 979 |
ret = local_rename(ctx, old_full_name.data, new_full_name.data); |
| 980 |
v9fs_string_free(&old_full_name); |
| 981 |
v9fs_string_free(&new_full_name); |
| 982 |
return ret;
|
| 983 |
} |
| 984 |
|
| 985 |
static int local_unlinkat(FsContext *ctx, V9fsPath *dir, |
| 986 |
const char *name, int flags) |
| 987 |
{
|
| 988 |
int ret;
|
| 989 |
V9fsString fullname; |
| 990 |
char buffer[PATH_MAX];
|
| 991 |
|
| 992 |
v9fs_string_init(&fullname); |
| 993 |
|
| 994 |
v9fs_string_sprintf(&fullname, "%s/%s", dir->data, name);
|
| 995 |
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
|
| 996 |
if (flags == AT_REMOVEDIR) {
|
| 997 |
/*
|
| 998 |
* If directory remove .virtfs_metadata contained in the
|
| 999 |
* directory
|
| 1000 |
*/
|
| 1001 |
sprintf(buffer, "%s/%s/%s", ctx->fs_root,
|
| 1002 |
fullname.data, VIRTFS_META_DIR); |
| 1003 |
ret = remove(buffer); |
| 1004 |
if (ret < 0 && errno != ENOENT) { |
| 1005 |
/*
|
| 1006 |
* We didn't had the .virtfs_metadata file. May be file created
|
| 1007 |
* in non-mapped mode ?. Ignore ENOENT.
|
| 1008 |
*/
|
| 1009 |
goto err_out;
|
| 1010 |
} |
| 1011 |
} |
| 1012 |
/*
|
| 1013 |
* Now remove the name from parent directory
|
| 1014 |
* .virtfs_metadata directory.
|
| 1015 |
*/
|
| 1016 |
ret = remove(local_mapped_attr_path(ctx, fullname.data, buffer)); |
| 1017 |
if (ret < 0 && errno != ENOENT) { |
| 1018 |
/*
|
| 1019 |
* We didn't had the .virtfs_metadata file. May be file created
|
| 1020 |
* in non-mapped mode ?. Ignore ENOENT.
|
| 1021 |
*/
|
| 1022 |
goto err_out;
|
| 1023 |
} |
| 1024 |
} |
| 1025 |
/* Remove the name finally */
|
| 1026 |
ret = remove(rpath(ctx, fullname.data, buffer)); |
| 1027 |
v9fs_string_free(&fullname); |
| 1028 |
|
| 1029 |
err_out:
|
| 1030 |
return ret;
|
| 1031 |
} |
| 1032 |
|
| 1033 |
static int local_ioc_getversion(FsContext *ctx, V9fsPath *path, |
| 1034 |
mode_t st_mode, uint64_t *st_gen) |
| 1035 |
{
|
| 1036 |
int err;
|
| 1037 |
#ifdef FS_IOC_GETVERSION
|
| 1038 |
V9fsFidOpenState fid_open; |
| 1039 |
|
| 1040 |
/*
|
| 1041 |
* Do not try to open special files like device nodes, fifos etc
|
| 1042 |
* We can get fd for regular files and directories only
|
| 1043 |
*/
|
| 1044 |
if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
|
| 1045 |
return 0; |
| 1046 |
} |
| 1047 |
err = local_open(ctx, path, O_RDONLY, &fid_open); |
| 1048 |
if (err < 0) { |
| 1049 |
return err;
|
| 1050 |
} |
| 1051 |
err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen); |
| 1052 |
local_close(ctx, &fid_open); |
| 1053 |
#else
|
| 1054 |
err = -ENOTTY; |
| 1055 |
#endif
|
| 1056 |
return err;
|
| 1057 |
} |
| 1058 |
|
| 1059 |
static int local_init(FsContext *ctx) |
| 1060 |
{
|
| 1061 |
int err = 0; |
| 1062 |
struct statfs stbuf;
|
| 1063 |
|
| 1064 |
if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
|
| 1065 |
ctx->xops = passthrough_xattr_ops; |
| 1066 |
} else if (ctx->export_flags & V9FS_SM_MAPPED) { |
| 1067 |
ctx->xops = mapped_xattr_ops; |
| 1068 |
} else if (ctx->export_flags & V9FS_SM_NONE) { |
| 1069 |
ctx->xops = none_xattr_ops; |
| 1070 |
} else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { |
| 1071 |
/*
|
| 1072 |
* xattr operation for mapped-file and passthrough
|
| 1073 |
* remain same.
|
| 1074 |
*/
|
| 1075 |
ctx->xops = passthrough_xattr_ops; |
| 1076 |
} |
| 1077 |
ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT; |
| 1078 |
#ifdef FS_IOC_GETVERSION
|
| 1079 |
/*
|
| 1080 |
* use ioc_getversion only if the iocl is definied
|
| 1081 |
*/
|
| 1082 |
err = statfs(ctx->fs_root, &stbuf); |
| 1083 |
if (!err) {
|
| 1084 |
switch (stbuf.f_type) {
|
| 1085 |
case EXT2_SUPER_MAGIC:
|
| 1086 |
case BTRFS_SUPER_MAGIC:
|
| 1087 |
case REISERFS_SUPER_MAGIC:
|
| 1088 |
case XFS_SUPER_MAGIC:
|
| 1089 |
ctx->exops.get_st_gen = local_ioc_getversion; |
| 1090 |
break;
|
| 1091 |
} |
| 1092 |
} |
| 1093 |
#endif
|
| 1094 |
return err;
|
| 1095 |
} |
| 1096 |
|
| 1097 |
static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse) |
| 1098 |
{
|
| 1099 |
const char *sec_model = qemu_opt_get(opts, "security_model"); |
| 1100 |
const char *path = qemu_opt_get(opts, "path"); |
| 1101 |
|
| 1102 |
if (!sec_model) {
|
| 1103 |
fprintf(stderr, "security model not specified, "
|
| 1104 |
"local fs needs security model\nvalid options are:"
|
| 1105 |
"\tsecurity_model=[passthrough|mapped|none]\n");
|
| 1106 |
return -1; |
| 1107 |
} |
| 1108 |
|
| 1109 |
if (!strcmp(sec_model, "passthrough")) { |
| 1110 |
fse->export_flags |= V9FS_SM_PASSTHROUGH; |
| 1111 |
} else if (!strcmp(sec_model, "mapped") || |
| 1112 |
!strcmp(sec_model, "mapped-xattr")) {
|
| 1113 |
fse->export_flags |= V9FS_SM_MAPPED; |
| 1114 |
} else if (!strcmp(sec_model, "none")) { |
| 1115 |
fse->export_flags |= V9FS_SM_NONE; |
| 1116 |
} else if (!strcmp(sec_model, "mapped-file")) { |
| 1117 |
fse->export_flags |= V9FS_SM_MAPPED_FILE; |
| 1118 |
} else {
|
| 1119 |
fprintf(stderr, "Invalid security model %s specified, valid options are"
|
| 1120 |
"\n\t [passthrough|mapped-xattr|mapped-file|none]\n",
|
| 1121 |
sec_model); |
| 1122 |
return -1; |
| 1123 |
} |
| 1124 |
|
| 1125 |
if (!path) {
|
| 1126 |
fprintf(stderr, "fsdev: No path specified.\n");
|
| 1127 |
return -1; |
| 1128 |
} |
| 1129 |
fse->path = g_strdup(path); |
| 1130 |
|
| 1131 |
return 0; |
| 1132 |
} |
| 1133 |
|
| 1134 |
FileOperations local_ops = {
|
| 1135 |
.parse_opts = local_parse_opts, |
| 1136 |
.init = local_init, |
| 1137 |
.lstat = local_lstat, |
| 1138 |
.readlink = local_readlink, |
| 1139 |
.close = local_close, |
| 1140 |
.closedir = local_closedir, |
| 1141 |
.open = local_open, |
| 1142 |
.opendir = local_opendir, |
| 1143 |
.rewinddir = local_rewinddir, |
| 1144 |
.telldir = local_telldir, |
| 1145 |
.readdir_r = local_readdir_r, |
| 1146 |
.seekdir = local_seekdir, |
| 1147 |
.preadv = local_preadv, |
| 1148 |
.pwritev = local_pwritev, |
| 1149 |
.chmod = local_chmod, |
| 1150 |
.mknod = local_mknod, |
| 1151 |
.mkdir = local_mkdir, |
| 1152 |
.fstat = local_fstat, |
| 1153 |
.open2 = local_open2, |
| 1154 |
.symlink = local_symlink, |
| 1155 |
.link = local_link, |
| 1156 |
.truncate = local_truncate, |
| 1157 |
.rename = local_rename, |
| 1158 |
.chown = local_chown, |
| 1159 |
.utimensat = local_utimensat, |
| 1160 |
.remove = local_remove, |
| 1161 |
.fsync = local_fsync, |
| 1162 |
.statfs = local_statfs, |
| 1163 |
.lgetxattr = local_lgetxattr, |
| 1164 |
.llistxattr = local_llistxattr, |
| 1165 |
.lsetxattr = local_lsetxattr, |
| 1166 |
.lremovexattr = local_lremovexattr, |
| 1167 |
.name_to_path = local_name_to_path, |
| 1168 |
.renameat = local_renameat, |
| 1169 |
.unlinkat = local_unlinkat, |
| 1170 |
}; |