4 * Copyright IBM, Corp. 2010
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 | AT_EMPTY_PATH) < 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);
440 fs->dir.stream = stream;
444 static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
446 rewinddir(fs->dir.stream);
449 static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
451 return telldir(fs->dir.stream);
454 static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs)
456 struct dirent *entry;
459 entry = readdir(fs->dir.stream);
464 if (ctx->export_flags & V9FS_SM_MAPPED) {
465 entry->d_type = DT_UNKNOWN;
466 } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
467 if (!strcmp(entry->d_name, VIRTFS_META_DIR)) {
468 /* skp the meta data directory */
471 entry->d_type = DT_UNKNOWN;
477 static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
479 seekdir(fs->dir.stream, off);
482 static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
483 const struct iovec *iov,
484 int iovcnt, off_t offset)
487 return preadv(fs->fd, iov, iovcnt, offset);
489 int err = lseek(fs->fd, offset, SEEK_SET);
493 return readv(fs->fd, iov, iovcnt);
498 static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
499 const struct iovec *iov,
500 int iovcnt, off_t offset)
504 ret = pwritev(fs->fd, iov, iovcnt, offset);
506 int err = lseek(fs->fd, offset, SEEK_SET);
510 ret = writev(fs->fd, iov, iovcnt);
513 #ifdef CONFIG_SYNC_FILE_RANGE
514 if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
516 * Initiate a writeback. This is not a data integrity sync.
517 * We want to ensure that we don't leave dirty pages in the cache
518 * after write when writeout=immediate is sepcified.
520 sync_file_range(fs->fd, offset, ret,
521 SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
527 static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
529 char *dirpath = g_path_get_dirname(fs_path->data);
530 char *name = g_path_get_basename(fs_path->data);
534 dirfd = local_opendir_nofollow(fs_ctx, dirpath);
539 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
540 ret = local_set_xattrat(dirfd, name, credp);
541 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
542 ret = local_set_mapped_file_attrat(dirfd, name, credp);
543 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
544 fs_ctx->export_flags & V9FS_SM_NONE) {
545 ret = fchmodat_nofollow(dirfd, name, credp->fc_mode);
547 close_preserve_errno(dirfd);
555 static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
556 const char *name, FsCred *credp)
561 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
566 if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
567 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
568 err = mknodat(dirfd, name, SM_LOCAL_MODE_BITS | S_IFREG, 0);
573 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
574 err = local_set_xattrat(dirfd, name, credp);
576 err = local_set_mapped_file_attrat(dirfd, name, credp);
581 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
582 fs_ctx->export_flags & V9FS_SM_NONE) {
583 err = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev);
587 err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp);
595 unlinkat_preserve_errno(dirfd, name, 0);
597 close_preserve_errno(dirfd);
601 static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
602 const char *name, FsCred *credp)
607 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
612 if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
613 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
614 err = mkdirat(dirfd, name, SM_LOCAL_DIR_MODE_BITS);
618 credp->fc_mode = credp->fc_mode | S_IFDIR;
620 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
621 err = local_set_xattrat(dirfd, name, credp);
623 err = local_set_mapped_file_attrat(dirfd, name, credp);
628 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
629 fs_ctx->export_flags & V9FS_SM_NONE) {
630 err = mkdirat(dirfd, name, credp->fc_mode);
634 err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp);
642 unlinkat_preserve_errno(dirfd, name, AT_REMOVEDIR);
644 close_preserve_errno(dirfd);
648 static int local_fstat(FsContext *fs_ctx, int fid_type,
649 V9fsFidOpenState *fs, struct stat *stbuf)
653 if (fid_type == P9_FID_DIR) {
654 fd = dirfd(fs->dir.stream);
659 err = fstat(fd, stbuf);
663 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
664 /* Actual credentials are part of extended attrs */
670 if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
671 stbuf->st_uid = le32_to_cpu(tmp_uid);
673 if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
674 stbuf->st_gid = le32_to_cpu(tmp_gid);
676 if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
677 stbuf->st_mode = le32_to_cpu(tmp_mode);
679 if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
680 stbuf->st_rdev = le64_to_cpu(tmp_dev);
682 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
689 static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
690 int flags, FsCred *credp, V9fsFidOpenState *fs)
697 * Mark all the open to not follow symlinks
701 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
706 /* Determine the security model */
707 if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
708 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
709 fd = openat_file(dirfd, name, flags, SM_LOCAL_MODE_BITS);
713 credp->fc_mode = credp->fc_mode|S_IFREG;
714 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
715 /* Set cleint credentials in xattr */
716 err = local_set_xattrat(dirfd, name, credp);
718 err = local_set_mapped_file_attrat(dirfd, name, credp);
723 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
724 (fs_ctx->export_flags & V9FS_SM_NONE)) {
725 fd = openat_file(dirfd, name, flags, credp->fc_mode);
729 err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp);
739 unlinkat_preserve_errno(dirfd, name,
740 flags & O_DIRECTORY ? AT_REMOVEDIR : 0);
741 close_preserve_errno(fd);
743 close_preserve_errno(dirfd);
748 static int local_symlink(FsContext *fs_ctx, const char *oldpath,
749 V9fsPath *dir_path, const char *name, FsCred *credp)
754 dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
759 /* Determine the security model */
760 if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
761 fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
763 ssize_t oldpath_size, write_size;
765 fd = openat_file(dirfd, name, O_CREAT | O_EXCL | O_RDWR,
770 /* Write the oldpath (target) to the file. */
771 oldpath_size = strlen(oldpath);
773 write_size = write(fd, (void *)oldpath, oldpath_size);
774 } while (write_size == -1 && errno == EINTR);
775 close_preserve_errno(fd);
777 if (write_size != oldpath_size) {
780 /* Set cleint credentials in symlink's xattr */
781 credp->fc_mode = credp->fc_mode | S_IFLNK;
783 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
784 err = local_set_xattrat(dirfd, name, credp);
786 err = local_set_mapped_file_attrat(dirfd, name, credp);
791 } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
792 fs_ctx->export_flags & V9FS_SM_NONE) {
793 err = symlinkat(oldpath, dirfd, name);
797 err = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
798 AT_SYMLINK_NOFOLLOW);
801 * If we fail to change ownership and if we are
802 * using security model none. Ignore the error
804 if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
814 unlinkat_preserve_errno(dirfd, name, 0);
816 close_preserve_errno(dirfd);
820 static int local_link(FsContext *ctx, V9fsPath *oldpath,
821 V9fsPath *dirpath, const char *name)
823 char *odirpath = g_path_get_dirname(oldpath->data);
824 char *oname = g_path_get_basename(oldpath->data);
828 odirfd = local_opendir_nofollow(ctx, odirpath);
833 ndirfd = local_opendir_nofollow(ctx, dirpath->data);
835 close_preserve_errno(odirfd);
839 ret = linkat(odirfd, oname, ndirfd, name, 0);
844 /* now link the virtfs_metadata files */
845 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
846 int omap_dirfd, nmap_dirfd;
848 ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700);
849 if (ret < 0 && errno != EEXIST) {
853 omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR);
854 if (omap_dirfd == -1) {
858 nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR);
859 if (nmap_dirfd == -1) {
860 close_preserve_errno(omap_dirfd);
864 ret = linkat(omap_dirfd, oname, nmap_dirfd, name, 0);
865 close_preserve_errno(nmap_dirfd);
866 close_preserve_errno(omap_dirfd);
867 if (ret < 0 && errno != ENOENT) {
878 unlinkat_preserve_errno(ndirfd, name, 0);
880 close_preserve_errno(ndirfd);
881 close_preserve_errno(odirfd);
888 static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
892 fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0);
896 ret = ftruncate(fd, size);
897 close_preserve_errno(fd);
901 static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
903 char *dirpath = g_path_get_dirname(fs_path->data);
904 char *name = g_path_get_basename(fs_path->data);
908 dirfd = local_opendir_nofollow(fs_ctx, dirpath);
913 if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
914 (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
915 (fs_ctx->export_flags & V9FS_SM_NONE)) {
916 ret = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
917 AT_SYMLINK_NOFOLLOW);
918 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
919 ret = local_set_xattrat(dirfd, name, credp);
920 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
921 ret = local_set_mapped_file_attrat(dirfd, name, credp);
924 close_preserve_errno(dirfd);
931 static int local_utimensat(FsContext *s, V9fsPath *fs_path,
932 const struct timespec *buf)
934 char *dirpath = g_path_get_dirname(fs_path->data);
935 char *name = g_path_get_basename(fs_path->data);
938 dirfd = local_opendir_nofollow(s, dirpath);
943 ret = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW);
944 close_preserve_errno(dirfd);
951 static int local_unlinkat_common(FsContext *ctx, int dirfd, const char *name,
956 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
959 if (flags == AT_REMOVEDIR) {
962 fd = openat(dirfd, name, O_RDONLY | O_DIRECTORY | O_PATH);
967 * If directory remove .virtfs_metadata contained in the
970 ret = unlinkat(fd, VIRTFS_META_DIR, AT_REMOVEDIR);
971 close_preserve_errno(fd);
972 if (ret < 0 && errno != ENOENT) {
974 * We didn't had the .virtfs_metadata file. May be file created
975 * in non-mapped mode ?. Ignore ENOENT.
981 * Now remove the name from parent directory
982 * .virtfs_metadata directory.
984 map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR);
985 ret = unlinkat(map_dirfd, name, 0);
986 close_preserve_errno(map_dirfd);
987 if (ret < 0 && errno != ENOENT) {
989 * We didn't had the .virtfs_metadata file. May be file created
990 * in non-mapped mode ?. Ignore ENOENT.
996 ret = unlinkat(dirfd, name, flags);
1001 static int local_remove(FsContext *ctx, const char *path)
1004 char *dirpath = g_path_get_dirname(path);
1005 char *name = g_path_get_basename(path);
1010 dirfd = local_opendir_nofollow(ctx, dirpath);
1015 if (fstatat(dirfd, path, &stbuf, AT_SYMLINK_NOFOLLOW) < 0) {
1019 if (S_ISDIR(stbuf.st_mode)) {
1020 flags |= AT_REMOVEDIR;
1023 err = local_unlinkat_common(ctx, dirfd, name, flags);
1025 close_preserve_errno(dirfd);
1032 static int local_fsync(FsContext *ctx, int fid_type,
1033 V9fsFidOpenState *fs, int datasync)
1037 if (fid_type == P9_FID_DIR) {
1038 fd = dirfd(fs->dir.stream);
1044 return qemu_fdatasync(fd);
1050 static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf)
1054 fd = local_open_nofollow(s, fs_path->data, O_RDONLY, 0);
1055 ret = fstatfs(fd, stbuf);
1056 close_preserve_errno(fd);
1060 static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
1061 const char *name, void *value, size_t size)
1063 char *path = fs_path->data;
1065 return v9fs_get_xattr(ctx, path, name, value, size);
1068 static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path,
1069 void *value, size_t size)
1071 char *path = fs_path->data;
1073 return v9fs_list_xattr(ctx, path, value, size);
1076 static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
1077 void *value, size_t size, int flags)
1079 char *path = fs_path->data;
1081 return v9fs_set_xattr(ctx, path, name, value, size, flags);
1084 static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
1087 char *path = fs_path->data;
1089 return v9fs_remove_xattr(ctx, path, name);
1092 static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path,
1093 const char *name, V9fsPath *target)
1096 v9fs_path_sprintf(target, "%s/%s", dir_path->data, name);
1098 v9fs_path_sprintf(target, "%s", name);
1103 static int local_renameat(FsContext *ctx, V9fsPath *olddir,
1104 const char *old_name, V9fsPath *newdir,
1105 const char *new_name)
1110 odirfd = local_opendir_nofollow(ctx, olddir->data);
1115 ndirfd = local_opendir_nofollow(ctx, newdir->data);
1117 close_preserve_errno(odirfd);
1121 ret = renameat(odirfd, old_name, ndirfd, new_name);
1126 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1127 int omap_dirfd, nmap_dirfd;
1129 ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700);
1130 if (ret < 0 && errno != EEXIST) {
1131 goto err_undo_rename;
1134 omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR);
1135 if (omap_dirfd == -1) {
1139 nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR);
1140 if (nmap_dirfd == -1) {
1141 close_preserve_errno(omap_dirfd);
1145 /* rename the .virtfs_metadata files */
1146 ret = renameat(omap_dirfd, old_name, nmap_dirfd, new_name);
1147 close_preserve_errno(nmap_dirfd);
1148 close_preserve_errno(omap_dirfd);
1149 if (ret < 0 && errno != ENOENT) {
1150 goto err_undo_rename;
1160 renameat_preserve_errno(ndirfd, new_name, odirfd, old_name);
1162 close_preserve_errno(ndirfd);
1163 close_preserve_errno(odirfd);
1167 static void v9fs_path_init_dirname(V9fsPath *path, const char *str)
1169 path->data = g_path_get_dirname(str);
1170 path->size = strlen(path->data) + 1;
1173 static int local_rename(FsContext *ctx, const char *oldpath,
1174 const char *newpath)
1177 char *oname = g_path_get_basename(oldpath);
1178 char *nname = g_path_get_basename(newpath);
1179 V9fsPath olddir, newdir;
1181 v9fs_path_init_dirname(&olddir, oldpath);
1182 v9fs_path_init_dirname(&newdir, newpath);
1184 err = local_renameat(ctx, &olddir, oname, &newdir, nname);
1186 v9fs_path_free(&newdir);
1187 v9fs_path_free(&olddir);
1194 static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
1195 const char *name, int flags)
1200 dirfd = local_opendir_nofollow(ctx, dir->data);
1205 ret = local_unlinkat_common(ctx, dirfd, name, flags);
1206 close_preserve_errno(dirfd);
1210 static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
1211 mode_t st_mode, uint64_t *st_gen)
1213 #ifdef FS_IOC_GETVERSION
1215 V9fsFidOpenState fid_open;
1218 * Do not try to open special files like device nodes, fifos etc
1219 * We can get fd for regular files and directories only
1221 if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
1225 err = local_open(ctx, path, O_RDONLY, &fid_open);
1229 err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
1230 local_close(ctx, &fid_open);
1238 static int local_init(FsContext *ctx)
1240 struct statfs stbuf;
1241 LocalData *data = g_malloc(sizeof(*data));
1243 data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY);
1244 if (data->mountfd == -1) {
1248 #ifdef FS_IOC_GETVERSION
1250 * use ioc_getversion only if the ioctl is definied
1252 if (fstatfs(data->mountfd, &stbuf) < 0) {
1253 close_preserve_errno(data->mountfd);
1256 switch (stbuf.f_type) {
1257 case EXT2_SUPER_MAGIC:
1258 case BTRFS_SUPER_MAGIC:
1259 case REISERFS_SUPER_MAGIC:
1260 case XFS_SUPER_MAGIC:
1261 ctx->exops.get_st_gen = local_ioc_getversion;
1266 if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
1267 ctx->xops = passthrough_xattr_ops;
1268 } else if (ctx->export_flags & V9FS_SM_MAPPED) {
1269 ctx->xops = mapped_xattr_ops;
1270 } else if (ctx->export_flags & V9FS_SM_NONE) {
1271 ctx->xops = none_xattr_ops;
1272 } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1274 * xattr operation for mapped-file and passthrough
1277 ctx->xops = passthrough_xattr_ops;
1279 ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
1281 ctx->private = data;
1289 static void local_cleanup(FsContext *ctx)
1291 LocalData *data = ctx->private;
1293 close(data->mountfd);
1297 static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
1299 const char *sec_model = qemu_opt_get(opts, "security_model");
1300 const char *path = qemu_opt_get(opts, "path");
1304 error_report("Security model not specified, local fs needs security model");
1305 error_printf("valid options are:"
1306 "\tsecurity_model=[passthrough|mapped-xattr|mapped-file|none]\n");
1310 if (!strcmp(sec_model, "passthrough")) {
1311 fse->export_flags |= V9FS_SM_PASSTHROUGH;
1312 } else if (!strcmp(sec_model, "mapped") ||
1313 !strcmp(sec_model, "mapped-xattr")) {
1314 fse->export_flags |= V9FS_SM_MAPPED;
1315 } else if (!strcmp(sec_model, "none")) {
1316 fse->export_flags |= V9FS_SM_NONE;
1317 } else if (!strcmp(sec_model, "mapped-file")) {
1318 fse->export_flags |= V9FS_SM_MAPPED_FILE;
1320 error_report("Invalid security model %s specified", sec_model);
1321 error_printf("valid options are:"
1322 "\t[passthrough|mapped-xattr|mapped-file|none]\n");
1327 error_report("fsdev: No path specified");
1331 fsdev_throttle_parse_opts(opts, &fse->fst, &err);
1333 error_reportf_err(err, "Throttle configuration is not valid: ");
1337 fse->path = g_strdup(path);
1342 FileOperations local_ops = {
1343 .parse_opts = local_parse_opts,
1345 .cleanup = local_cleanup,
1346 .lstat = local_lstat,
1347 .readlink = local_readlink,
1348 .close = local_close,
1349 .closedir = local_closedir,
1351 .opendir = local_opendir,
1352 .rewinddir = local_rewinddir,
1353 .telldir = local_telldir,
1354 .readdir = local_readdir,
1355 .seekdir = local_seekdir,
1356 .preadv = local_preadv,
1357 .pwritev = local_pwritev,
1358 .chmod = local_chmod,
1359 .mknod = local_mknod,
1360 .mkdir = local_mkdir,
1361 .fstat = local_fstat,
1362 .open2 = local_open2,
1363 .symlink = local_symlink,
1365 .truncate = local_truncate,
1366 .rename = local_rename,
1367 .chown = local_chown,
1368 .utimensat = local_utimensat,
1369 .remove = local_remove,
1370 .fsync = local_fsync,
1371 .statfs = local_statfs,
1372 .lgetxattr = local_lgetxattr,
1373 .llistxattr = local_llistxattr,
1374 .lsetxattr = local_lsetxattr,
1375 .lremovexattr = local_lremovexattr,
1376 .name_to_path = local_name_to_path,
1377 .renameat = local_renameat,
1378 .unlinkat = local_unlinkat,