blob: 3d77594f92451f77667e33e2c6d6f441db02cf8f [file] [log] [blame]
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +05301/*
Wei Liu3b9ca042015-11-18 18:03:14 +00002 * 9p handle callback
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +05303 *
4 * Copyright IBM, Corp. 2011
5 *
6 * Authors:
7 * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.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
Peter Maydellfbc04122016-01-26 18:17:10 +000014#include "qemu/osdep.h"
Wei Liuebe74f82016-01-07 18:18:02 +000015#include "9p.h"
Wei Liu267ae092015-11-18 18:31:52 +000016#include "9p-xattr.h"
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +053017#include <arpa/inet.h>
18#include <pwd.h>
19#include <grp.h>
20#include <sys/socket.h>
21#include <sys/un.h>
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010022#include "qemu/xattr.h"
Veronia Bahaaf348b6d2016-03-20 19:16:19 +020023#include "qemu/cutils.h"
Greg Kurz63325b12016-01-22 15:12:17 +010024#include "qemu/error-report.h"
Harsh Prateek Boraedb9eb72011-10-12 19:11:25 +053025#include <linux/fs.h>
26#ifdef CONFIG_LINUX_MAGIC_H
27#include <linux/magic.h>
28#endif
29#include <sys/ioctl.h>
30
31#ifndef XFS_SUPER_MAGIC
32#define XFS_SUPER_MAGIC 0x58465342
33#endif
34#ifndef EXT2_SUPER_MAGIC
35#define EXT2_SUPER_MAGIC 0xEF53
36#endif
37#ifndef REISERFS_SUPER_MAGIC
38#define REISERFS_SUPER_MAGIC 0x52654973
39#endif
40#ifndef BTRFS_SUPER_MAGIC
41#define BTRFS_SUPER_MAGIC 0x9123683E
42#endif
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +053043
44struct handle_data {
45 int mountfd;
46 int handle_bytes;
47};
48
Aneesh Kumar K.Vd2042372011-10-12 19:11:24 +053049static inline int name_to_handle(int dirfd, const char *name,
50 struct file_handle *fh, int *mnt_id, int flags)
51{
52 return name_to_handle_at(dirfd, name, fh, mnt_id, flags);
53}
54
55static inline int open_by_handle(int mountfd, const char *fh, int flags)
56{
57 return open_by_handle_at(mountfd, (struct file_handle *)fh, flags);
58}
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +053059
60static int handle_update_file_cred(int dirfd, const char *name, FsCred *credp)
61{
62 int fd, ret;
Dong Xu Wang3a931132011-11-29 16:52:38 +080063 fd = openat(dirfd, name, O_NONBLOCK | O_NOFOLLOW);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +053064 if (fd < 0) {
65 return fd;
66 }
M. Mohan Kumar2d405642012-01-19 12:21:12 +053067 ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +053068 if (ret < 0) {
69 goto err_out;
70 }
M. Mohan Kumar2d405642012-01-19 12:21:12 +053071 ret = fchmod(fd, credp->fc_mode & 07777);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +053072err_out:
73 close(fd);
74 return ret;
75}
76
77
78static int handle_lstat(FsContext *fs_ctx, V9fsPath *fs_path,
79 struct stat *stbuf)
80{
81 int fd, ret;
82 struct handle_data *data = (struct handle_data *)fs_ctx->private;
83
84 fd = open_by_handle(data->mountfd, fs_path->data, O_PATH);
85 if (fd < 0) {
86 return fd;
87 }
88 ret = fstatat(fd, "", stbuf, AT_EMPTY_PATH);
89 close(fd);
90 return ret;
91}
92
93static ssize_t handle_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
94 char *buf, size_t bufsz)
95{
96 int fd, ret;
97 struct handle_data *data = (struct handle_data *)fs_ctx->private;
98
99 fd = open_by_handle(data->mountfd, fs_path->data, O_PATH);
100 if (fd < 0) {
101 return fd;
102 }
103 ret = readlinkat(fd, "", buf, bufsz);
104 close(fd);
105 return ret;
106}
107
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530108static int handle_close(FsContext *ctx, V9fsFidOpenState *fs)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530109{
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530110 return close(fs->fd);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530111}
112
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530113static int handle_closedir(FsContext *ctx, V9fsFidOpenState *fs)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530114{
Greg Kurzf314ea42016-06-06 11:52:34 +0200115 return closedir(fs->dir.stream);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530116}
117
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530118static int handle_open(FsContext *ctx, V9fsPath *fs_path,
119 int flags, V9fsFidOpenState *fs)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530120{
121 struct handle_data *data = (struct handle_data *)ctx->private;
122
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530123 fs->fd = open_by_handle(data->mountfd, fs_path->data, flags);
124 return fs->fd;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530125}
126
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530127static int handle_opendir(FsContext *ctx,
128 V9fsPath *fs_path, V9fsFidOpenState *fs)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530129{
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530130 int ret;
131 ret = handle_open(ctx, fs_path, O_DIRECTORY, fs);
132 if (ret < 0) {
133 return -1;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530134 }
Greg Kurzf314ea42016-06-06 11:52:34 +0200135 fs->dir.stream = fdopendir(ret);
136 if (!fs->dir.stream) {
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530137 return -1;
138 }
139 return 0;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530140}
141
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530142static void handle_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530143{
Greg Kurzf314ea42016-06-06 11:52:34 +0200144 rewinddir(fs->dir.stream);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530145}
146
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530147static off_t handle_telldir(FsContext *ctx, V9fsFidOpenState *fs)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530148{
Greg Kurzf314ea42016-06-06 11:52:34 +0200149 return telldir(fs->dir.stream);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530150}
151
Greg Kurz635324e2016-06-06 11:52:34 +0200152static struct dirent *handle_readdir(FsContext *ctx, V9fsFidOpenState *fs)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530153{
Greg Kurz635324e2016-06-06 11:52:34 +0200154 return readdir(fs->dir.stream);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530155}
156
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530157static void handle_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530158{
Greg Kurzf314ea42016-06-06 11:52:34 +0200159 seekdir(fs->dir.stream, off);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530160}
161
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530162static ssize_t handle_preadv(FsContext *ctx, V9fsFidOpenState *fs,
163 const struct iovec *iov,
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530164 int iovcnt, off_t offset)
165{
166#ifdef CONFIG_PREADV
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530167 return preadv(fs->fd, iov, iovcnt, offset);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530168#else
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530169 int err = lseek(fs->fd, offset, SEEK_SET);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530170 if (err == -1) {
171 return err;
172 } else {
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530173 return readv(fs->fd, iov, iovcnt);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530174 }
175#endif
176}
177
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530178static ssize_t handle_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
179 const struct iovec *iov,
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530180 int iovcnt, off_t offset)
181{
Aneesh Kumar K.Vd3ab98e2011-10-12 19:11:23 +0530182 ssize_t ret;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530183#ifdef CONFIG_PREADV
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530184 ret = pwritev(fs->fd, iov, iovcnt, offset);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530185#else
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530186 int err = lseek(fs->fd, offset, SEEK_SET);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530187 if (err == -1) {
188 return err;
189 } else {
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530190 ret = writev(fs->fd, iov, iovcnt);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530191 }
192#endif
Aneesh Kumar K.Vd3ab98e2011-10-12 19:11:23 +0530193#ifdef CONFIG_SYNC_FILE_RANGE
194 if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
195 /*
196 * Initiate a writeback. This is not a data integrity sync.
197 * We want to ensure that we don't leave dirty pages in the cache
198 * after write when writeout=immediate is sepcified.
199 */
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530200 sync_file_range(fs->fd, offset, ret,
Aneesh Kumar K.Vd3ab98e2011-10-12 19:11:23 +0530201 SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
202 }
203#endif
204 return ret;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530205}
206
207static int handle_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
208{
209 int fd, ret;
210 struct handle_data *data = (struct handle_data *)fs_ctx->private;
211
212 fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
213 if (fd < 0) {
214 return fd;
215 }
216 ret = fchmod(fd, credp->fc_mode);
217 close(fd);
218 return ret;
219}
220
221static int handle_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
222 const char *name, FsCred *credp)
223{
224 int dirfd, ret;
225 struct handle_data *data = (struct handle_data *)fs_ctx->private;
226
227 dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
228 if (dirfd < 0) {
229 return dirfd;
230 }
231 ret = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev);
232 if (!ret) {
233 ret = handle_update_file_cred(dirfd, name, credp);
234 }
235 close(dirfd);
236 return ret;
237}
238
239static int handle_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
240 const char *name, FsCred *credp)
241{
242 int dirfd, ret;
243 struct handle_data *data = (struct handle_data *)fs_ctx->private;
244
245 dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
246 if (dirfd < 0) {
247 return dirfd;
248 }
249 ret = mkdirat(dirfd, name, credp->fc_mode);
250 if (!ret) {
251 ret = handle_update_file_cred(dirfd, name, credp);
252 }
253 close(dirfd);
254 return ret;
255}
256
Aneesh Kumar K.V8b888272011-12-04 22:35:28 +0530257static int handle_fstat(FsContext *fs_ctx, int fid_type,
258 V9fsFidOpenState *fs, struct stat *stbuf)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530259{
Aneesh Kumar K.V8b888272011-12-04 22:35:28 +0530260 int fd;
261
262 if (fid_type == P9_FID_DIR) {
Greg Kurzf314ea42016-06-06 11:52:34 +0200263 fd = dirfd(fs->dir.stream);
Aneesh Kumar K.V8b888272011-12-04 22:35:28 +0530264 } else {
265 fd = fs->fd;
266 }
267 return fstat(fd, stbuf);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530268}
269
270static int handle_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530271 int flags, FsCred *credp, V9fsFidOpenState *fs)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530272{
273 int ret;
274 int dirfd, fd;
275 struct handle_data *data = (struct handle_data *)fs_ctx->private;
276
277 dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
278 if (dirfd < 0) {
279 return dirfd;
280 }
281 fd = openat(dirfd, name, flags | O_NOFOLLOW, credp->fc_mode);
282 if (fd >= 0) {
283 ret = handle_update_file_cred(dirfd, name, credp);
284 if (ret < 0) {
285 close(fd);
286 fd = ret;
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530287 } else {
288 fs->fd = fd;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530289 }
290 }
291 close(dirfd);
292 return fd;
293}
294
295
296static int handle_symlink(FsContext *fs_ctx, const char *oldpath,
297 V9fsPath *dir_path, const char *name, FsCred *credp)
298{
299 int fd, dirfd, ret;
300 struct handle_data *data = (struct handle_data *)fs_ctx->private;
301
302 dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
303 if (dirfd < 0) {
304 return dirfd;
305 }
306 ret = symlinkat(oldpath, dirfd, name);
307 if (!ret) {
308 fd = openat(dirfd, name, O_PATH | O_NOFOLLOW);
309 if (fd < 0) {
310 ret = fd;
311 goto err_out;
312 }
313 ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
314 close(fd);
315 }
316err_out:
317 close(dirfd);
318 return ret;
319}
320
321static int handle_link(FsContext *ctx, V9fsPath *oldpath,
322 V9fsPath *dirpath, const char *name)
323{
324 int oldfd, newdirfd, ret;
325 struct handle_data *data = (struct handle_data *)ctx->private;
326
327 oldfd = open_by_handle(data->mountfd, oldpath->data, O_PATH);
328 if (oldfd < 0) {
329 return oldfd;
330 }
331 newdirfd = open_by_handle(data->mountfd, dirpath->data, O_PATH);
332 if (newdirfd < 0) {
333 close(oldfd);
334 return newdirfd;
335 }
336 ret = linkat(oldfd, "", newdirfd, name, AT_EMPTY_PATH);
337 close(newdirfd);
338 close(oldfd);
339 return ret;
340}
341
342static int handle_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
343{
344 int fd, ret;
345 struct handle_data *data = (struct handle_data *)ctx->private;
346
347 fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK | O_WRONLY);
348 if (fd < 0) {
349 return fd;
350 }
351 ret = ftruncate(fd, size);
352 close(fd);
353 return ret;
354}
355
356static int handle_rename(FsContext *ctx, const char *oldpath,
357 const char *newpath)
358{
359 errno = EOPNOTSUPP;
360 return -1;
361}
362
363static int handle_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
364{
365 int fd, ret;
366 struct handle_data *data = (struct handle_data *)fs_ctx->private;
367
368 fd = open_by_handle(data->mountfd, fs_path->data, O_PATH);
369 if (fd < 0) {
370 return fd;
371 }
372 ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
373 close(fd);
374 return ret;
375}
376
377static int handle_utimensat(FsContext *ctx, V9fsPath *fs_path,
378 const struct timespec *buf)
379{
Aneesh Kumar K.Vd2042372011-10-12 19:11:24 +0530380 int ret;
381#ifdef CONFIG_UTIMENSAT
382 int fd;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530383 struct handle_data *data = (struct handle_data *)ctx->private;
384
385 fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
386 if (fd < 0) {
387 return fd;
388 }
389 ret = futimens(fd, buf);
390 close(fd);
Aneesh Kumar K.Vd2042372011-10-12 19:11:24 +0530391#else
392 ret = -1;
393 errno = ENOSYS;
394#endif
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530395 return ret;
396}
397
398static int handle_remove(FsContext *ctx, const char *path)
399{
400 errno = EOPNOTSUPP;
401 return -1;
402}
403
Aneesh Kumar K.V8b888272011-12-04 22:35:28 +0530404static int handle_fsync(FsContext *ctx, int fid_type,
405 V9fsFidOpenState *fs, int datasync)
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530406{
Aneesh Kumar K.V8b888272011-12-04 22:35:28 +0530407 int fd;
408
409 if (fid_type == P9_FID_DIR) {
Greg Kurzf314ea42016-06-06 11:52:34 +0200410 fd = dirfd(fs->dir.stream);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530411 } else {
Aneesh Kumar K.V8b888272011-12-04 22:35:28 +0530412 fd = fs->fd;
413 }
414
415 if (datasync) {
416 return qemu_fdatasync(fd);
417 } else {
418 return fsync(fd);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530419 }
420}
421
422static int handle_statfs(FsContext *ctx, V9fsPath *fs_path,
423 struct statfs *stbuf)
424{
425 int fd, ret;
426 struct handle_data *data = (struct handle_data *)ctx->private;
427
428 fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
429 if (fd < 0) {
430 return fd;
431 }
432 ret = fstatfs(fd, stbuf);
433 close(fd);
434 return ret;
435}
436
437static ssize_t handle_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
438 const char *name, void *value, size_t size)
439{
440 int fd, ret;
441 struct handle_data *data = (struct handle_data *)ctx->private;
442
443 fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
444 if (fd < 0) {
445 return fd;
446 }
447 ret = fgetxattr(fd, name, value, size);
448 close(fd);
449 return ret;
450}
451
452static ssize_t handle_llistxattr(FsContext *ctx, V9fsPath *fs_path,
453 void *value, size_t size)
454{
455 int fd, ret;
456 struct handle_data *data = (struct handle_data *)ctx->private;
457
458 fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
459 if (fd < 0) {
460 return fd;
461 }
462 ret = flistxattr(fd, value, size);
463 close(fd);
464 return ret;
465}
466
467static int handle_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
468 void *value, size_t size, int flags)
469{
470 int fd, ret;
471 struct handle_data *data = (struct handle_data *)ctx->private;
472
473 fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
474 if (fd < 0) {
475 return fd;
476 }
477 ret = fsetxattr(fd, name, value, size, flags);
478 close(fd);
479 return ret;
480}
481
482static int handle_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
483 const char *name)
484{
485 int fd, ret;
486 struct handle_data *data = (struct handle_data *)ctx->private;
487
488 fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
489 if (fd < 0) {
490 return fd;
491 }
492 ret = fremovexattr(fd, name);
493 close(fd);
494 return ret;
495}
496
497static int handle_name_to_path(FsContext *ctx, V9fsPath *dir_path,
498 const char *name, V9fsPath *target)
499{
Chen Gang4fa4ce72014-03-02 01:36:19 +0800500 char *buffer;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530501 struct file_handle *fh;
502 int dirfd, ret, mnt_id;
503 struct handle_data *data = (struct handle_data *)ctx->private;
504
505 /* "." and ".." are not allowed */
506 if (!strcmp(name, ".") || !strcmp(name, "..")) {
507 errno = EINVAL;
508 return -1;
509
510 }
511 if (dir_path) {
512 dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
513 } else {
514 /* relative to export root */
Chen Gang4fa4ce72014-03-02 01:36:19 +0800515 buffer = rpath(ctx, ".");
516 dirfd = open(buffer, O_DIRECTORY);
517 g_free(buffer);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530518 }
519 if (dirfd < 0) {
520 return dirfd;
521 }
522 fh = g_malloc(sizeof(struct file_handle) + data->handle_bytes);
523 fh->handle_bytes = data->handle_bytes;
Dong Xu Wang66a0a2c2011-11-29 16:52:39 +0800524 /* add a "./" at the beginning of the path */
Chen Gang4fa4ce72014-03-02 01:36:19 +0800525 buffer = g_strdup_printf("./%s", name);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530526 /* flag = 0 imply don't follow symlink */
527 ret = name_to_handle(dirfd, buffer, fh, &mnt_id, 0);
528 if (!ret) {
529 target->data = (char *)fh;
530 target->size = sizeof(struct file_handle) + data->handle_bytes;
531 } else {
532 g_free(fh);
533 }
534 close(dirfd);
Chen Gang4fa4ce72014-03-02 01:36:19 +0800535 g_free(buffer);
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530536 return ret;
537}
538
539static int handle_renameat(FsContext *ctx, V9fsPath *olddir,
540 const char *old_name, V9fsPath *newdir,
541 const char *new_name)
542{
543 int olddirfd, newdirfd, ret;
544 struct handle_data *data = (struct handle_data *)ctx->private;
545
546 olddirfd = open_by_handle(data->mountfd, olddir->data, O_PATH);
547 if (olddirfd < 0) {
548 return olddirfd;
549 }
550 newdirfd = open_by_handle(data->mountfd, newdir->data, O_PATH);
551 if (newdirfd < 0) {
552 close(olddirfd);
553 return newdirfd;
554 }
555 ret = renameat(olddirfd, old_name, newdirfd, new_name);
556 close(newdirfd);
557 close(olddirfd);
558 return ret;
559}
560
561static int handle_unlinkat(FsContext *ctx, V9fsPath *dir,
562 const char *name, int flags)
563{
564 int dirfd, ret;
565 struct handle_data *data = (struct handle_data *)ctx->private;
Paolo Bonzini930b5882011-11-18 17:35:38 +0100566 int rflags;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530567
568 dirfd = open_by_handle(data->mountfd, dir->data, O_PATH);
569 if (dirfd < 0) {
570 return dirfd;
571 }
572
Paolo Bonzini930b5882011-11-18 17:35:38 +0100573 rflags = 0;
574 if (flags & P9_DOTL_AT_REMOVEDIR) {
575 rflags |= AT_REMOVEDIR;
576 }
577
578 ret = unlinkat(dirfd, name, rflags);
579
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530580 close(dirfd);
581 return ret;
582}
583
Harsh Prateek Boraedb9eb72011-10-12 19:11:25 +0530584static int handle_ioc_getversion(FsContext *ctx, V9fsPath *path,
585 mode_t st_mode, uint64_t *st_gen)
586{
Kirill A. Shutemovb9317662014-01-28 17:08:25 +0200587#ifdef FS_IOC_GETVERSION
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530588 int err;
589 V9fsFidOpenState fid_open;
Harsh Prateek Boraedb9eb72011-10-12 19:11:25 +0530590
591 /*
592 * Do not try to open special files like device nodes, fifos etc
593 * We can get fd for regular files and directories only
594 */
595 if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
Kirill A. Shutemov1a9978a2014-01-28 17:08:26 +0200596 errno = ENOTTY;
597 return -1;
Harsh Prateek Boraedb9eb72011-10-12 19:11:25 +0530598 }
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530599 err = handle_open(ctx, path, O_RDONLY, &fid_open);
600 if (err < 0) {
601 return err;
Harsh Prateek Boraedb9eb72011-10-12 19:11:25 +0530602 }
Aneesh Kumar K.Vcc720dd2011-10-25 12:10:40 +0530603 err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
604 handle_close(ctx, &fid_open);
Harsh Prateek Boraedb9eb72011-10-12 19:11:25 +0530605 return err;
Kirill A. Shutemovb9317662014-01-28 17:08:25 +0200606#else
607 errno = ENOTTY;
608 return -1;
609#endif
Harsh Prateek Boraedb9eb72011-10-12 19:11:25 +0530610}
611
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530612static int handle_init(FsContext *ctx)
613{
614 int ret, mnt_id;
Harsh Prateek Boraedb9eb72011-10-12 19:11:25 +0530615 struct statfs stbuf;
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530616 struct file_handle fh;
617 struct handle_data *data = g_malloc(sizeof(struct handle_data));
Aneesh Kumar K.Vd2042372011-10-12 19:11:24 +0530618
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530619 data->mountfd = open(ctx->fs_root, O_DIRECTORY);
620 if (data->mountfd < 0) {
621 ret = data->mountfd;
622 goto err_out;
623 }
Harsh Prateek Boraedb9eb72011-10-12 19:11:25 +0530624 ret = statfs(ctx->fs_root, &stbuf);
625 if (!ret) {
626 switch (stbuf.f_type) {
627 case EXT2_SUPER_MAGIC:
628 case BTRFS_SUPER_MAGIC:
629 case REISERFS_SUPER_MAGIC:
630 case XFS_SUPER_MAGIC:
631 ctx->exops.get_st_gen = handle_ioc_getversion;
632 break;
633 }
634 }
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530635 memset(&fh, 0, sizeof(struct file_handle));
636 ret = name_to_handle(data->mountfd, ".", &fh, &mnt_id, 0);
637 if (ret && errno == EOVERFLOW) {
638 data->handle_bytes = fh.handle_bytes;
639 ctx->private = data;
640 ret = 0;
641 goto out;
642 }
643 /* we got 0 byte handle ? */
644 ret = -1;
645 close(data->mountfd);
646err_out:
647 g_free(data);
648out:
649 return ret;
650}
651
Aneesh Kumar K.V99519f02011-12-14 13:48:59 +0530652static int handle_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
653{
654 const char *sec_model = qemu_opt_get(opts, "security_model");
655 const char *path = qemu_opt_get(opts, "path");
656
657 if (sec_model) {
Greg Kurz63325b12016-01-22 15:12:17 +0100658 error_report("Invalid argument security_model specified with handle fsdriver");
Aneesh Kumar K.V99519f02011-12-14 13:48:59 +0530659 return -1;
660 }
661
662 if (!path) {
Greg Kurz63325b12016-01-22 15:12:17 +0100663 error_report("fsdev: No path specified");
Aneesh Kumar K.V99519f02011-12-14 13:48:59 +0530664 return -1;
665 }
666 fse->path = g_strdup(path);
667 return 0;
668
669}
670
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530671FileOperations handle_ops = {
Aneesh Kumar K.V99519f02011-12-14 13:48:59 +0530672 .parse_opts = handle_parse_opts,
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530673 .init = handle_init,
674 .lstat = handle_lstat,
675 .readlink = handle_readlink,
676 .close = handle_close,
677 .closedir = handle_closedir,
678 .open = handle_open,
679 .opendir = handle_opendir,
680 .rewinddir = handle_rewinddir,
681 .telldir = handle_telldir,
Greg Kurz635324e2016-06-06 11:52:34 +0200682 .readdir = handle_readdir,
Aneesh Kumar K.V5f542222011-08-02 11:35:54 +0530683 .seekdir = handle_seekdir,
684 .preadv = handle_preadv,
685 .pwritev = handle_pwritev,
686 .chmod = handle_chmod,
687 .mknod = handle_mknod,
688 .mkdir = handle_mkdir,
689 .fstat = handle_fstat,
690 .open2 = handle_open2,
691 .symlink = handle_symlink,
692 .link = handle_link,
693 .truncate = handle_truncate,
694 .rename = handle_rename,
695 .chown = handle_chown,
696 .utimensat = handle_utimensat,
697 .remove = handle_remove,
698 .fsync = handle_fsync,
699 .statfs = handle_statfs,
700 .lgetxattr = handle_lgetxattr,
701 .llistxattr = handle_llistxattr,
702 .lsetxattr = handle_lsetxattr,
703 .lremovexattr = handle_lremovexattr,
704 .name_to_path = handle_name_to_path,
705 .renameat = handle_renameat,
706 .unlinkat = handle_unlinkat,
707};