4
* Copyright IBM, Corp. 2010
7
* Anthony Liguori <aliguori@us.ibm.com>
9
* This work is licensed under the terms of the GNU GPL, version 2. See
10
* the COPYING file in the top-level directory.
14
#include "qemu/osdep.h"
19
#include "fsdev/qemu-fsdev.h" /* local_ops */
20
#include <arpa/inet.h>
23
#include <sys/socket.h>
25
#include "qemu/xattr.h"
26
#include "qemu/cutils.h"
27
#include "qemu/error-report.h"
30
#ifdef CONFIG_LINUX_MAGIC_H
31
#include <linux/magic.h>
33
#include <sys/ioctl.h>
35
#ifndef XFS_SUPER_MAGIC
36
#define XFS_SUPER_MAGIC 0x58465342
38
#ifndef EXT2_SUPER_MAGIC
39
#define EXT2_SUPER_MAGIC 0xEF53
41
#ifndef REISERFS_SUPER_MAGIC
42
#define REISERFS_SUPER_MAGIC 0x52654973
44
#ifndef BTRFS_SUPER_MAGIC
45
#define BTRFS_SUPER_MAGIC 0x9123683E
52
int local_open_nofollow(FsContext *fs_ctx, const char *path, int flags,
55
LocalData *data = fs_ctx->private;
57
/* All paths are relative to the path data->mountfd points to */
58
while (*path == '/') {
62
return relative_openat_nofollow(data->mountfd, path, flags, mode);
65
int local_opendir_nofollow(FsContext *fs_ctx, const char *path)
67
return local_open_nofollow(fs_ctx, path, O_DIRECTORY | O_RDONLY, 0);
70
static void renameat_preserve_errno(int odirfd, const char *opath, int ndirfd,
74
renameat(odirfd, opath, ndirfd, npath);
78
static void unlinkat_preserve_errno(int dirfd, const char *path, int flags)
81
unlinkat(dirfd, path, flags);
85
#define VIRTFS_META_DIR ".virtfs_metadata"
87
static FILE *local_fopenat(int dirfd, const char *name, const char *mode)
93
* only supports two modes
97
} else if (mode[0] == 'w') {
98
flags = O_WRONLY | O_TRUNC | O_CREAT;
99
o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
103
fd = openat_file(dirfd, name, flags, o_mode);
107
fp = fdopen(fd, mode);
115
static void local_mapped_file_attr(int dirfd, const char *name,
122
map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR);
123
if (map_dirfd == -1) {
127
fp = local_fopenat(map_dirfd, name, "r");
128
close_preserve_errno(map_dirfd);
132
memset(buf, 0, ATTR_MAX);
133
while (fgets(buf, ATTR_MAX, fp)) {
134
if (!strncmp(buf, "virtfs.uid", 10)) {
135
stbuf->st_uid = atoi(buf+11);
136
} else if (!strncmp(buf, "virtfs.gid", 10)) {
137
stbuf->st_gid = atoi(buf+11);
138
} else if (!strncmp(buf, "virtfs.mode", 11)) {
139
stbuf->st_mode = atoi(buf+12);
140
} else if (!strncmp(buf, "virtfs.rdev", 11)) {
141
stbuf->st_rdev = atoi(buf+12);
143
memset(buf, 0, ATTR_MAX);
148
static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
151
char *dirpath = g_path_get_dirname(fs_path->data);
152
char *name = g_path_get_basename(fs_path->data);
155
dirfd = local_opendir_nofollow(fs_ctx, dirpath);
160
err = fstatat(dirfd, name, stbuf, AT_SYMLINK_NOFOLLOW);
164
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
165
/* Actual credentials are part of extended attrs */
171
if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.uid", &tmp_uid,
172
sizeof(uid_t)) > 0) {
173
stbuf->st_uid = le32_to_cpu(tmp_uid);
175
if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.gid", &tmp_gid,
176
sizeof(gid_t)) > 0) {
177
stbuf->st_gid = le32_to_cpu(tmp_gid);
179
if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.mode", &tmp_mode,
180
sizeof(mode_t)) > 0) {
181
stbuf->st_mode = le32_to_cpu(tmp_mode);
183
if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.rdev", &tmp_dev,
184
sizeof(dev_t)) > 0) {
185
stbuf->st_rdev = le64_to_cpu(tmp_dev);
187
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
188
local_mapped_file_attr(dirfd, name, stbuf);
192
close_preserve_errno(dirfd);
199
static int local_set_mapped_file_attrat(int dirfd, const char *name,
205
int uid = -1, gid = -1, mode = -1, rdev = -1;
208
ret = mkdirat(dirfd, VIRTFS_META_DIR, 0700);
209
if (ret < 0 && errno != EEXIST) {
213
map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR);
214
if (map_dirfd == -1) {
218
fp = local_fopenat(map_dirfd, name, "r");
220
if (errno == ENOENT) {
221
goto update_map_file;
223
close_preserve_errno(map_dirfd);
227
memset(buf, 0, ATTR_MAX);
228
while (fgets(buf, ATTR_MAX, fp)) {
229
if (!strncmp(buf, "virtfs.uid", 10)) {
230
uid = atoi(buf + 11);
231
} else if (!strncmp(buf, "virtfs.gid", 10)) {
232
gid = atoi(buf + 11);
233
} else if (!strncmp(buf, "virtfs.mode", 11)) {
234
mode = atoi(buf + 12);
235
} else if (!strncmp(buf, "virtfs.rdev", 11)) {
236
rdev = atoi(buf + 12);
238
memset(buf, 0, ATTR_MAX);
243
fp = local_fopenat(map_dirfd, name, "w");
244
close_preserve_errno(map_dirfd);
249
if (credp->fc_uid != -1) {
252
if (credp->fc_gid != -1) {
255
if (credp->fc_mode != -1) {
256
mode = credp->fc_mode;
258
if (credp->fc_rdev != -1) {
259
rdev = credp->fc_rdev;
263
fprintf(fp, "virtfs.uid=%d\n", uid);
266
fprintf(fp, "virtfs.gid=%d\n", gid);
269
fprintf(fp, "virtfs.mode=%d\n", mode);
272
fprintf(fp, "virtfs.rdev=%d\n", rdev);
279
static int fchmodat_nofollow(int dirfd, const char *name, mode_t mode)
283
/* FIXME: this should be handled with fchmodat(AT_SYMLINK_NOFOLLOW).
284
* Unfortunately, the linux kernel doesn't implement it yet. As an
285
* alternative, let's open the file and use fchmod() instead. This
286
* may fail depending on the permissions of the file, but it is the
287
* best we can do to avoid TOCTTOU. We first try to open read-only
288
* in case name points to a directory. If that fails, we try write-only
289
* in case name doesn't point to a directory.
291
fd = openat_file(dirfd, name, O_RDONLY, 0);
293
/* In case the file is writable-only and isn't a directory. */
294
if (errno == EACCES) {
295
fd = openat_file(dirfd, name, O_WRONLY, 0);
297
if (fd == -1 && errno == EISDIR) {
304
ret = fchmod(fd, mode);
305
close_preserve_errno(fd);
309
static int local_set_xattrat(int dirfd, const char *path, FsCred *credp)
313
if (credp->fc_uid != -1) {
314
uint32_t tmp_uid = cpu_to_le32(credp->fc_uid);
315
err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.uid", &tmp_uid,
321
if (credp->fc_gid != -1) {
322
uint32_t tmp_gid = cpu_to_le32(credp->fc_gid);
323
err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.gid", &tmp_gid,
329
if (credp->fc_mode != -1) {
330
uint32_t tmp_mode = cpu_to_le32(credp->fc_mode);
331
err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.mode", &tmp_mode,
337
if (credp->fc_rdev != -1) {
338
uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev);
339
err = fsetxattrat_nofollow(dirfd, path, "user.virtfs.rdev", &tmp_rdev,
348
static int local_set_cred_passthrough(FsContext *fs_ctx, int dirfd,
349
const char *name, FsCred *credp)
351
if (fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
352
AT_SYMLINK_NOFOLLOW) < 0) {
354
* If we fail to change ownership and if we are
355
* using security model none. Ignore the error
357
if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
362
return fchmodat_nofollow(dirfd, name, credp->fc_mode & 07777);
365
static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
366
char *buf, size_t bufsz)
370
if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
371
(fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
374
fd = local_open_nofollow(fs_ctx, fs_path->data, O_RDONLY, 0);
379
tsize = read(fd, (void *)buf, bufsz);
380
} while (tsize == -1 && errno == EINTR);
381
close_preserve_errno(fd);
382
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
383
(fs_ctx->export_flags & V9FS_SM_NONE)) {
384
char *dirpath = g_path_get_dirname(fs_path->data);
385
char *name = g_path_get_basename(fs_path->data);
388
dirfd = local_opendir_nofollow(fs_ctx, dirpath);
393
tsize = readlinkat(dirfd, name, buf, bufsz);
394
close_preserve_errno(dirfd);
402
static int local_close(FsContext *ctx, V9fsFidOpenState *fs)
404
return close(fs->fd);
407
static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs)
409
return closedir(fs->dir.stream);
412
static int local_open(FsContext *ctx, V9fsPath *fs_path,
413
int flags, V9fsFidOpenState *fs)
417
fd = local_open_nofollow(ctx, fs_path->data, flags, 0);
425
static int local_opendir(FsContext *ctx,
426
V9fsPath *fs_path, V9fsFidOpenState *fs)
431
dirfd = local_opendir_nofollow(ctx, fs_path->data);
436
stream = fdopendir(dirfd);
441
fs->dir.stream = stream;
445
static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
447
rewinddir(fs->dir.stream);
450
static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
452
return telldir(fs->dir.stream);
455
static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs)
457
struct dirent *entry;
460
entry = readdir(fs->dir.stream);
465
if (ctx->export_flags & V9FS_SM_MAPPED) {
466
entry->d_type = DT_UNKNOWN;
467
} else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
468
if (!strcmp(entry->d_name, VIRTFS_META_DIR)) {
469
/* skp the meta data directory */
472
entry->d_type = DT_UNKNOWN;
478
static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
480
seekdir(fs->dir.stream, off);
483
static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
484
const struct iovec *iov,
485
int iovcnt, off_t offset)
488
return preadv(fs->fd, iov, iovcnt, offset);
490
int err = lseek(fs->fd, offset, SEEK_SET);
494
return readv(fs->fd, iov, iovcnt);
499
static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
500
const struct iovec *iov,
501
int iovcnt, off_t offset)
506
ret = pwritev(fs->fd, iov, iovcnt, offset);
508
int err = lseek(fs->fd, offset, SEEK_SET);
512
ret = writev(fs->fd, iov, iovcnt);
515
#ifdef CONFIG_SYNC_FILE_RANGE
516
if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
518
* Initiate a writeback. This is not a data integrity sync.
519
* We want to ensure that we don't leave dirty pages in the cache
520
* after write when writeout=immediate is sepcified.
522
sync_file_range(fs->fd, offset, ret,
523
SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
529
static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
531
char *dirpath = g_path_get_dirname(fs_path->data);
532
char *name = g_path_get_basename(fs_path->data);
536
dirfd = local_opendir_nofollow(fs_ctx, dirpath);
541
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
542
ret = local_set_xattrat(dirfd, name, credp);
543
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
544
ret = local_set_mapped_file_attrat(dirfd, name, credp);
545
} else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
546
fs_ctx->export_flags & V9FS_SM_NONE) {
547
ret = fchmodat_nofollow(dirfd, name, credp->fc_mode);
549
close_preserve_errno(dirfd);
557
static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
558
const char *name, FsCred *credp)
563
dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
568
if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
569
fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
570
err = mknodat(dirfd, name, SM_LOCAL_MODE_BITS | S_IFREG, 0);
575
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
576
err = local_set_xattrat(dirfd, name, credp);
578
err = local_set_mapped_file_attrat(dirfd, name, credp);
583
} else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
584
fs_ctx->export_flags & V9FS_SM_NONE) {
585
err = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev);
589
err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp);
597
unlinkat_preserve_errno(dirfd, name, 0);
599
close_preserve_errno(dirfd);
603
static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
604
const char *name, FsCred *credp)
609
dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
614
if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
615
fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
616
err = mkdirat(dirfd, name, SM_LOCAL_DIR_MODE_BITS);
620
credp->fc_mode = credp->fc_mode | S_IFDIR;
622
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
623
err = local_set_xattrat(dirfd, name, credp);
625
err = local_set_mapped_file_attrat(dirfd, name, credp);
630
} else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
631
fs_ctx->export_flags & V9FS_SM_NONE) {
632
err = mkdirat(dirfd, name, credp->fc_mode);
636
err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp);
644
unlinkat_preserve_errno(dirfd, name, AT_REMOVEDIR);
646
close_preserve_errno(dirfd);
650
static int local_fstat(FsContext *fs_ctx, int fid_type,
651
V9fsFidOpenState *fs, struct stat *stbuf)
655
if (fid_type == P9_FID_DIR) {
656
fd = dirfd(fs->dir.stream);
661
err = fstat(fd, stbuf);
665
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
666
/* Actual credentials are part of extended attrs */
672
if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
673
stbuf->st_uid = le32_to_cpu(tmp_uid);
675
if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
676
stbuf->st_gid = le32_to_cpu(tmp_gid);
678
if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
679
stbuf->st_mode = le32_to_cpu(tmp_mode);
681
if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
682
stbuf->st_rdev = le64_to_cpu(tmp_dev);
684
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
691
static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
692
int flags, FsCred *credp, V9fsFidOpenState *fs)
699
* Mark all the open to not follow symlinks
703
dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
708
/* Determine the security model */
709
if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
710
fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
711
fd = openat_file(dirfd, name, flags, SM_LOCAL_MODE_BITS);
715
credp->fc_mode = credp->fc_mode|S_IFREG;
716
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
717
/* Set cleint credentials in xattr */
718
err = local_set_xattrat(dirfd, name, credp);
720
err = local_set_mapped_file_attrat(dirfd, name, credp);
725
} else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
726
(fs_ctx->export_flags & V9FS_SM_NONE)) {
727
fd = openat_file(dirfd, name, flags, credp->fc_mode);
731
err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp);
741
unlinkat_preserve_errno(dirfd, name,
742
flags & O_DIRECTORY ? AT_REMOVEDIR : 0);
743
close_preserve_errno(fd);
745
close_preserve_errno(dirfd);
750
static int local_symlink(FsContext *fs_ctx, const char *oldpath,
751
V9fsPath *dir_path, const char *name, FsCred *credp)
756
dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
761
/* Determine the security model */
762
if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
763
fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
765
ssize_t oldpath_size, write_size;
767
fd = openat_file(dirfd, name, O_CREAT | O_EXCL | O_RDWR,
772
/* Write the oldpath (target) to the file. */
773
oldpath_size = strlen(oldpath);
775
write_size = write(fd, (void *)oldpath, oldpath_size);
776
} while (write_size == -1 && errno == EINTR);
777
close_preserve_errno(fd);
779
if (write_size != oldpath_size) {
782
/* Set cleint credentials in symlink's xattr */
783
credp->fc_mode = credp->fc_mode | S_IFLNK;
785
if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
786
err = local_set_xattrat(dirfd, name, credp);
788
err = local_set_mapped_file_attrat(dirfd, name, credp);
793
} else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
794
fs_ctx->export_flags & V9FS_SM_NONE) {
795
err = symlinkat(oldpath, dirfd, name);
799
err = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
800
AT_SYMLINK_NOFOLLOW);
803
* If we fail to change ownership and if we are
804
* using security model none. Ignore the error
806
if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
816
unlinkat_preserve_errno(dirfd, name, 0);
818
close_preserve_errno(dirfd);
822
static int local_link(FsContext *ctx, V9fsPath *oldpath,
823
V9fsPath *dirpath, const char *name)
825
char *odirpath = g_path_get_dirname(oldpath->data);
826
char *oname = g_path_get_basename(oldpath->data);
830
odirfd = local_opendir_nofollow(ctx, odirpath);
835
ndirfd = local_opendir_nofollow(ctx, dirpath->data);
837
close_preserve_errno(odirfd);
841
ret = linkat(odirfd, oname, ndirfd, name, 0);
846
/* now link the virtfs_metadata files */
847
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
848
int omap_dirfd, nmap_dirfd;
850
ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700);
851
if (ret < 0 && errno != EEXIST) {
855
omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR);
856
if (omap_dirfd == -1) {
860
nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR);
861
if (nmap_dirfd == -1) {
862
close_preserve_errno(omap_dirfd);
866
ret = linkat(omap_dirfd, oname, nmap_dirfd, name, 0);
867
close_preserve_errno(nmap_dirfd);
868
close_preserve_errno(omap_dirfd);
869
if (ret < 0 && errno != ENOENT) {
880
unlinkat_preserve_errno(ndirfd, name, 0);
882
close_preserve_errno(ndirfd);
883
close_preserve_errno(odirfd);
890
static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
894
fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0);
898
ret = ftruncate(fd, size);
899
close_preserve_errno(fd);
903
static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
905
char *dirpath = g_path_get_dirname(fs_path->data);
906
char *name = g_path_get_basename(fs_path->data);
910
dirfd = local_opendir_nofollow(fs_ctx, dirpath);
915
if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
916
(fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
917
(fs_ctx->export_flags & V9FS_SM_NONE)) {
918
ret = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
919
AT_SYMLINK_NOFOLLOW);
920
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
921
ret = local_set_xattrat(dirfd, name, credp);
922
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
923
ret = local_set_mapped_file_attrat(dirfd, name, credp);
926
close_preserve_errno(dirfd);
933
static int local_utimensat(FsContext *s, V9fsPath *fs_path,
934
const struct timespec *buf)
936
char *dirpath = g_path_get_dirname(fs_path->data);
937
char *name = g_path_get_basename(fs_path->data);
940
dirfd = local_opendir_nofollow(s, dirpath);
945
ret = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW);
946
close_preserve_errno(dirfd);
953
static int local_unlinkat_common(FsContext *ctx, int dirfd, const char *name,
958
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
961
if (flags == AT_REMOVEDIR) {
964
fd = openat_dir(dirfd, name);
969
* If directory remove .virtfs_metadata contained in the
972
ret = unlinkat(fd, VIRTFS_META_DIR, AT_REMOVEDIR);
973
close_preserve_errno(fd);
974
if (ret < 0 && errno != ENOENT) {
976
* We didn't had the .virtfs_metadata file. May be file created
977
* in non-mapped mode ?. Ignore ENOENT.
983
* Now remove the name from parent directory
984
* .virtfs_metadata directory.
986
map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR);
987
ret = unlinkat(map_dirfd, name, 0);
988
close_preserve_errno(map_dirfd);
989
if (ret < 0 && errno != ENOENT) {
991
* We didn't had the .virtfs_metadata file. May be file created
992
* in non-mapped mode ?. Ignore ENOENT.
998
ret = unlinkat(dirfd, name, flags);
1003
static int local_remove(FsContext *ctx, const char *path)
1006
char *dirpath = g_path_get_dirname(path);
1007
char *name = g_path_get_basename(path);
1012
dirfd = local_opendir_nofollow(ctx, dirpath);
1017
if (fstatat(dirfd, path, &stbuf, AT_SYMLINK_NOFOLLOW) < 0) {
1021
if (S_ISDIR(stbuf.st_mode)) {
1022
flags |= AT_REMOVEDIR;
1025
err = local_unlinkat_common(ctx, dirfd, name, flags);
1027
close_preserve_errno(dirfd);
1034
static int local_fsync(FsContext *ctx, int fid_type,
1035
V9fsFidOpenState *fs, int datasync)
1039
if (fid_type == P9_FID_DIR) {
1040
fd = dirfd(fs->dir.stream);
1046
return qemu_fdatasync(fd);
1052
static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf)
1056
fd = local_open_nofollow(s, fs_path->data, O_RDONLY, 0);
1060
ret = fstatfs(fd, stbuf);
1061
close_preserve_errno(fd);
1065
static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
1066
const char *name, void *value, size_t size)
1068
char *path = fs_path->data;
1070
return v9fs_get_xattr(ctx, path, name, value, size);
1073
static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path,
1074
void *value, size_t size)
1076
char *path = fs_path->data;
1078
return v9fs_list_xattr(ctx, path, value, size);
1081
static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
1082
void *value, size_t size, int flags)
1084
char *path = fs_path->data;
1086
return v9fs_set_xattr(ctx, path, name, value, size, flags);
1089
static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
1092
char *path = fs_path->data;
1094
return v9fs_remove_xattr(ctx, path, name);
1097
static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path,
1098
const char *name, V9fsPath *target)
1101
v9fs_path_sprintf(target, "%s/%s", dir_path->data, name);
1102
} else if (strcmp(name, "/")) {
1103
v9fs_path_sprintf(target, "%s", name);
1105
/* We want the path of the export root to be relative, otherwise
1106
* "*at()" syscalls would treat it as "/" in the host.
1108
v9fs_path_sprintf(target, "%s", ".");
1113
static int local_renameat(FsContext *ctx, V9fsPath *olddir,
1114
const char *old_name, V9fsPath *newdir,
1115
const char *new_name)
1120
odirfd = local_opendir_nofollow(ctx, olddir->data);
1125
ndirfd = local_opendir_nofollow(ctx, newdir->data);
1127
close_preserve_errno(odirfd);
1131
ret = renameat(odirfd, old_name, ndirfd, new_name);
1136
if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1137
int omap_dirfd, nmap_dirfd;
1139
ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700);
1140
if (ret < 0 && errno != EEXIST) {
1141
goto err_undo_rename;
1144
omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR);
1145
if (omap_dirfd == -1) {
1149
nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR);
1150
if (nmap_dirfd == -1) {
1151
close_preserve_errno(omap_dirfd);
1155
/* rename the .virtfs_metadata files */
1156
ret = renameat(omap_dirfd, old_name, nmap_dirfd, new_name);
1157
close_preserve_errno(nmap_dirfd);
1158
close_preserve_errno(omap_dirfd);
1159
if (ret < 0 && errno != ENOENT) {
1160
goto err_undo_rename;
1170
renameat_preserve_errno(ndirfd, new_name, odirfd, old_name);
1172
close_preserve_errno(ndirfd);
1173
close_preserve_errno(odirfd);
1177
static void v9fs_path_init_dirname(V9fsPath *path, const char *str)
1179
path->data = g_path_get_dirname(str);
1180
path->size = strlen(path->data) + 1;
1183
static int local_rename(FsContext *ctx, const char *oldpath,
1184
const char *newpath)
1187
char *oname = g_path_get_basename(oldpath);
1188
char *nname = g_path_get_basename(newpath);
1189
V9fsPath olddir, newdir;
1191
v9fs_path_init_dirname(&olddir, oldpath);
1192
v9fs_path_init_dirname(&newdir, newpath);
1194
err = local_renameat(ctx, &olddir, oname, &newdir, nname);
1196
v9fs_path_free(&newdir);
1197
v9fs_path_free(&olddir);
1204
static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
1205
const char *name, int flags)
1210
dirfd = local_opendir_nofollow(ctx, dir->data);
1215
ret = local_unlinkat_common(ctx, dirfd, name, flags);
1216
close_preserve_errno(dirfd);
1220
static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
1221
mode_t st_mode, uint64_t *st_gen)
1223
#ifdef FS_IOC_GETVERSION
1225
V9fsFidOpenState fid_open;
1228
* Do not try to open special files like device nodes, fifos etc
1229
* We can get fd for regular files and directories only
1231
if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
1235
err = local_open(ctx, path, O_RDONLY, &fid_open);
1239
err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
1240
local_close(ctx, &fid_open);
1248
static int local_init(FsContext *ctx)
1250
struct statfs stbuf;
1251
LocalData *data = g_malloc(sizeof(*data));
1253
data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY);
1254
if (data->mountfd == -1) {
1258
#ifdef FS_IOC_GETVERSION
1260
* use ioc_getversion only if the ioctl is definied
1262
if (fstatfs(data->mountfd, &stbuf) < 0) {
1263
close_preserve_errno(data->mountfd);
1266
switch (stbuf.f_type) {
1267
case EXT2_SUPER_MAGIC:
1268
case BTRFS_SUPER_MAGIC:
1269
case REISERFS_SUPER_MAGIC:
1270
case XFS_SUPER_MAGIC:
1271
ctx->exops.get_st_gen = local_ioc_getversion;
1276
if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
1277
ctx->xops = passthrough_xattr_ops;
1278
} else if (ctx->export_flags & V9FS_SM_MAPPED) {
1279
ctx->xops = mapped_xattr_ops;
1280
} else if (ctx->export_flags & V9FS_SM_NONE) {
1281
ctx->xops = none_xattr_ops;
1282
} else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1284
* xattr operation for mapped-file and passthrough
1287
ctx->xops = passthrough_xattr_ops;
1289
ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
1291
ctx->private = data;
1299
static void local_cleanup(FsContext *ctx)
1301
LocalData *data = ctx->private;
1303
close(data->mountfd);
1307
static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
1309
const char *sec_model = qemu_opt_get(opts, "security_model");
1310
const char *path = qemu_opt_get(opts, "path");
1313
error_report("Security model not specified, local fs needs security model");
1314
error_printf("valid options are:"
1315
"\tsecurity_model=[passthrough|mapped-xattr|mapped-file|none]\n");
1319
if (!strcmp(sec_model, "passthrough")) {
1320
fse->export_flags |= V9FS_SM_PASSTHROUGH;
1321
} else if (!strcmp(sec_model, "mapped") ||
1322
!strcmp(sec_model, "mapped-xattr")) {
1323
fse->export_flags |= V9FS_SM_MAPPED;
1324
} else if (!strcmp(sec_model, "none")) {
1325
fse->export_flags |= V9FS_SM_NONE;
1326
} else if (!strcmp(sec_model, "mapped-file")) {
1327
fse->export_flags |= V9FS_SM_MAPPED_FILE;
1329
error_report("Invalid security model %s specified", sec_model);
1330
error_printf("valid options are:"
1331
"\t[passthrough|mapped-xattr|mapped-file|none]\n");
1336
error_report("fsdev: No path specified");
1339
fse->path = g_strdup(path);
1344
FileOperations local_ops = {
1345
.parse_opts = local_parse_opts,
1347
.cleanup = local_cleanup,
1348
.lstat = local_lstat,
1349
.readlink = local_readlink,
1350
.close = local_close,
1351
.closedir = local_closedir,
1353
.opendir = local_opendir,
1354
.rewinddir = local_rewinddir,
1355
.telldir = local_telldir,
1356
.readdir = local_readdir,
1357
.seekdir = local_seekdir,
1358
.preadv = local_preadv,
1359
.pwritev = local_pwritev,
1360
.chmod = local_chmod,
1361
.mknod = local_mknod,
1362
.mkdir = local_mkdir,
1363
.fstat = local_fstat,
1364
.open2 = local_open2,
1365
.symlink = local_symlink,
1367
.truncate = local_truncate,
1368
.rename = local_rename,
1369
.chown = local_chown,
1370
.utimensat = local_utimensat,
1371
.remove = local_remove,
1372
.fsync = local_fsync,
1373
.statfs = local_statfs,
1374
.lgetxattr = local_lgetxattr,
1375
.llistxattr = local_llistxattr,
1376
.lsetxattr = local_lsetxattr,
1377
.lremovexattr = local_lremovexattr,
1378
.name_to_path = local_name_to_path,
1379
.renameat = local_renameat,
1380
.unlinkat = local_unlinkat,