2 * Virtio 9p Posix callback
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 "hw/virtio/virtio.h"
15 #include "virtio-9p.h"
16 #include "virtio-9p-xattr.h"
17 #include "fsdev/qemu-fsdev.h" /* local_ops */
18 #include <arpa/inet.h>
21 #include <sys/socket.h>
23 #include "qemu/xattr.h"
26 #ifdef CONFIG_LINUX_MAGIC_H
27 #include <linux/magic.h>
29 #include <sys/ioctl.h>
31 #ifndef XFS_SUPER_MAGIC
32 #define XFS_SUPER_MAGIC 0x58465342
34 #ifndef EXT2_SUPER_MAGIC
35 #define EXT2_SUPER_MAGIC 0xEF53
37 #ifndef REISERFS_SUPER_MAGIC
38 #define REISERFS_SUPER_MAGIC 0x52654973
40 #ifndef BTRFS_SUPER_MAGIC
41 #define BTRFS_SUPER_MAGIC 0x9123683E
44 #define VIRTFS_META_DIR ".virtfs_metadata"
46 static char *local_mapped_attr_path(FsContext *ctx, const char *path)
49 const char *name = strrchr(path, '/');
57 return g_strdup_printf("%s/%.*s/%s/%s", ctx->fs_root,
58 dirlen, path, VIRTFS_META_DIR, name);
61 static FILE *local_fopen(const char *path, const char *mode)
65 int flags = O_NOFOLLOW;
67 * only supports two modes
71 } else if (mode[0] == 'w') {
72 flags |= O_WRONLY | O_TRUNC | O_CREAT;
73 o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
77 fd = open(path, flags, o_mode);
81 fp = fdopen(fd, mode);
89 static void local_mapped_file_attr(FsContext *ctx, const char *path,
96 attr_path = local_mapped_attr_path(ctx, path);
97 fp = local_fopen(attr_path, "r");
102 memset(buf, 0, ATTR_MAX);
103 while (fgets(buf, ATTR_MAX, fp)) {
104 if (!strncmp(buf, "virtfs.uid", 10)) {
105 stbuf->st_uid = atoi(buf+11);
106 } else if (!strncmp(buf, "virtfs.gid", 10)) {
107 stbuf->st_gid = atoi(buf+11);
108 } else if (!strncmp(buf, "virtfs.mode", 11)) {
109 stbuf->st_mode = atoi(buf+12);
110 } else if (!strncmp(buf, "virtfs.rdev", 11)) {
111 stbuf->st_rdev = atoi(buf+12);
113 memset(buf, 0, ATTR_MAX);
118 static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
122 char *path = fs_path->data;
124 buffer = rpath(fs_ctx, path);
125 err = lstat(buffer, stbuf);
129 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
130 /* Actual credentials are part of extended attrs */
135 if (getxattr(buffer, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
136 stbuf->st_uid = le32_to_cpu(tmp_uid);
138 if (getxattr(buffer, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
139 stbuf->st_gid = le32_to_cpu(tmp_gid);
141 if (getxattr(buffer, "user.virtfs.mode",
142 &tmp_mode, sizeof(mode_t)) > 0) {
143 stbuf->st_mode = le32_to_cpu(tmp_mode);
145 if (getxattr(buffer, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
146 stbuf->st_rdev = le64_to_cpu(tmp_dev);
148 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
149 local_mapped_file_attr(fs_ctx, path, stbuf);
157 static int local_create_mapped_attr_dir(FsContext *ctx, const char *path)
161 char *tmp_path = g_strdup(path);
163 attr_dir = g_strdup_printf("%s/%s/%s",
164 ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR);
166 err = mkdir(attr_dir, 0700);
167 if (err < 0 && errno == EEXIST) {
175 static int local_set_mapped_file_attr(FsContext *ctx,
176 const char *path, FsCred *credp)
182 int uid = -1, gid = -1, mode = -1, rdev = -1;
184 attr_path = local_mapped_attr_path(ctx, path);
185 fp = local_fopen(attr_path, "r");
187 goto create_map_file;
189 memset(buf, 0, ATTR_MAX);
190 while (fgets(buf, ATTR_MAX, fp)) {
191 if (!strncmp(buf, "virtfs.uid", 10)) {
193 } else if (!strncmp(buf, "virtfs.gid", 10)) {
195 } else if (!strncmp(buf, "virtfs.mode", 11)) {
197 } else if (!strncmp(buf, "virtfs.rdev", 11)) {
200 memset(buf, 0, ATTR_MAX);
203 goto update_map_file;
206 ret = local_create_mapped_attr_dir(ctx, path);
212 fp = local_fopen(attr_path, "w");
218 if (credp->fc_uid != -1) {
221 if (credp->fc_gid != -1) {
224 if (credp->fc_mode != -1) {
225 mode = credp->fc_mode;
227 if (credp->fc_rdev != -1) {
228 rdev = credp->fc_rdev;
233 fprintf(fp, "virtfs.uid=%d\n", uid);
236 fprintf(fp, "virtfs.gid=%d\n", gid);
239 fprintf(fp, "virtfs.mode=%d\n", mode);
242 fprintf(fp, "virtfs.rdev=%d\n", rdev);
251 static int local_set_xattr(const char *path, FsCred *credp)
255 if (credp->fc_uid != -1) {
256 uint32_t tmp_uid = cpu_to_le32(credp->fc_uid);
257 err = setxattr(path, "user.virtfs.uid", &tmp_uid, sizeof(uid_t), 0);
262 if (credp->fc_gid != -1) {
263 uint32_t tmp_gid = cpu_to_le32(credp->fc_gid);
264 err = setxattr(path, "user.virtfs.gid", &tmp_gid, sizeof(gid_t), 0);
269 if (credp->fc_mode != -1) {
270 uint32_t tmp_mode = cpu_to_le32(credp->fc_mode);
271 err = setxattr(path, "user.virtfs.mode", &tmp_mode, sizeof(mode_t), 0);
276 if (credp->fc_rdev != -1) {
277 uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev);
278 err = setxattr(path, "user.virtfs.rdev", &tmp_rdev, sizeof(dev_t), 0);
286 static int local_post_create_passthrough(FsContext *fs_ctx, const char *path,
291 buffer = rpath(fs_ctx, path);
292 if (lchown(buffer, credp->fc_uid, credp->fc_gid) < 0) {
294 * If we fail to change ownership and if we are
295 * using security model none. Ignore the error
297 if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
302 if (chmod(buffer, credp->fc_mode & 07777) < 0) {
313 static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
314 char *buf, size_t bufsz)
318 char *path = fs_path->data;
320 if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
321 (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
323 buffer = rpath(fs_ctx, path);
324 fd = open(buffer, O_RDONLY | O_NOFOLLOW);
330 tsize = read(fd, (void *)buf, bufsz);
331 } while (tsize == -1 && errno == EINTR);
333 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
334 (fs_ctx->export_flags & V9FS_SM_NONE)) {
335 buffer = rpath(fs_ctx, path);
336 tsize = readlink(buffer, buf, bufsz);
342 static int local_close(FsContext *ctx, V9fsFidOpenState *fs)
344 return close(fs->fd);
347 static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs)
349 return closedir(fs->dir);
352 static int local_open(FsContext *ctx, V9fsPath *fs_path,
353 int flags, V9fsFidOpenState *fs)
356 char *path = fs_path->data;
358 buffer = rpath(ctx, path);
359 fs->fd = open(buffer, flags | O_NOFOLLOW);
364 static int local_opendir(FsContext *ctx,
365 V9fsPath *fs_path, V9fsFidOpenState *fs)
368 char *path = fs_path->data;
370 buffer = rpath(ctx, path);
371 fs->dir = opendir(buffer);
379 static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
384 static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
386 return telldir(fs->dir);
389 static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
390 struct dirent *entry,
391 struct dirent **result)
396 ret = readdir_r(fs->dir, entry, result);
397 if (ctx->export_flags & V9FS_SM_MAPPED) {
398 entry->d_type = DT_UNKNOWN;
399 } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
400 if (!ret && *result != NULL &&
401 !strcmp(entry->d_name, VIRTFS_META_DIR)) {
402 /* skp the meta data directory */
405 entry->d_type = DT_UNKNOWN;
410 static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
412 seekdir(fs->dir, off);
415 static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
416 const struct iovec *iov,
417 int iovcnt, off_t offset)
420 return preadv(fs->fd, iov, iovcnt, offset);
422 int err = lseek(fs->fd, offset, SEEK_SET);
426 return readv(fs->fd, iov, iovcnt);
431 static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
432 const struct iovec *iov,
433 int iovcnt, off_t offset)
438 ret = pwritev(fs->fd, iov, iovcnt, offset);
440 int err = lseek(fs->fd, offset, SEEK_SET);
444 ret = writev(fs->fd, iov, iovcnt);
447 #ifdef CONFIG_SYNC_FILE_RANGE
448 if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
450 * Initiate a writeback. This is not a data integrity sync.
451 * We want to ensure that we don't leave dirty pages in the cache
452 * after write when writeout=immediate is sepcified.
454 sync_file_range(fs->fd, offset, ret,
455 SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
461 static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
465 char *path = fs_path->data;
467 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
468 buffer = rpath(fs_ctx, path);
469 ret = local_set_xattr(buffer, credp);
471 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
472 return local_set_mapped_file_attr(fs_ctx, path, credp);
473 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
474 (fs_ctx->export_flags & V9FS_SM_NONE)) {
475 buffer = rpath(fs_ctx, path);
476 ret = chmod(buffer, credp->fc_mode);
482 static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
483 const char *name, FsCred *credp)
491 v9fs_string_init(&fullname);
492 v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
493 path = fullname.data;
495 /* Determine the security model */
496 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
497 buffer = rpath(fs_ctx, path);
498 err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0);
502 err = local_set_xattr(buffer, credp);
507 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
509 buffer = rpath(fs_ctx, path);
510 err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0);
514 err = local_set_mapped_file_attr(fs_ctx, path, credp);
519 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
520 (fs_ctx->export_flags & V9FS_SM_NONE)) {
521 buffer = rpath(fs_ctx, path);
522 err = mknod(buffer, credp->fc_mode, credp->fc_rdev);
526 err = local_post_create_passthrough(fs_ctx, path, credp);
539 v9fs_string_free(&fullname);
543 static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
544 const char *name, FsCred *credp)
552 v9fs_string_init(&fullname);
553 v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
554 path = fullname.data;
556 /* Determine the security model */
557 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
558 buffer = rpath(fs_ctx, path);
559 err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS);
563 credp->fc_mode = credp->fc_mode|S_IFDIR;
564 err = local_set_xattr(buffer, credp);
569 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
570 buffer = rpath(fs_ctx, path);
571 err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS);
575 credp->fc_mode = credp->fc_mode|S_IFDIR;
576 err = local_set_mapped_file_attr(fs_ctx, path, credp);
581 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
582 (fs_ctx->export_flags & V9FS_SM_NONE)) {
583 buffer = rpath(fs_ctx, path);
584 err = mkdir(buffer, credp->fc_mode);
588 err = local_post_create_passthrough(fs_ctx, path, credp);
601 v9fs_string_free(&fullname);
605 static int local_fstat(FsContext *fs_ctx, int fid_type,
606 V9fsFidOpenState *fs, struct stat *stbuf)
610 if (fid_type == P9_FID_DIR) {
616 err = fstat(fd, stbuf);
620 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
621 /* Actual credentials are part of extended attrs */
627 if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
628 stbuf->st_uid = le32_to_cpu(tmp_uid);
630 if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
631 stbuf->st_gid = le32_to_cpu(tmp_gid);
633 if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
634 stbuf->st_mode = le32_to_cpu(tmp_mode);
636 if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
637 stbuf->st_rdev = le64_to_cpu(tmp_dev);
639 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
646 static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
647 int flags, FsCred *credp, V9fsFidOpenState *fs)
657 * Mark all the open to not follow symlinks
661 v9fs_string_init(&fullname);
662 v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
663 path = fullname.data;
665 /* Determine the security model */
666 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
667 buffer = rpath(fs_ctx, path);
668 fd = open(buffer, flags, SM_LOCAL_MODE_BITS);
673 credp->fc_mode = credp->fc_mode|S_IFREG;
674 /* Set cleint credentials in xattr */
675 err = local_set_xattr(buffer, credp);
680 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
681 buffer = rpath(fs_ctx, path);
682 fd = open(buffer, flags, SM_LOCAL_MODE_BITS);
687 credp->fc_mode = credp->fc_mode|S_IFREG;
688 /* Set client credentials in .virtfs_metadata directory files */
689 err = local_set_mapped_file_attr(fs_ctx, path, credp);
694 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
695 (fs_ctx->export_flags & V9FS_SM_NONE)) {
696 buffer = rpath(fs_ctx, path);
697 fd = open(buffer, flags, credp->fc_mode);
702 err = local_post_create_passthrough(fs_ctx, path, credp);
718 v9fs_string_free(&fullname);
723 static int local_symlink(FsContext *fs_ctx, const char *oldpath,
724 V9fsPath *dir_path, const char *name, FsCred *credp)
732 v9fs_string_init(&fullname);
733 v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
734 newpath = fullname.data;
736 /* Determine the security model */
737 if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
739 ssize_t oldpath_size, write_size;
740 buffer = rpath(fs_ctx, newpath);
741 fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS);
746 /* Write the oldpath (target) to the file. */
747 oldpath_size = strlen(oldpath);
749 write_size = write(fd, (void *)oldpath, oldpath_size);
750 } while (write_size == -1 && errno == EINTR);
752 if (write_size != oldpath_size) {
759 /* Set cleint credentials in symlink's xattr */
760 credp->fc_mode = credp->fc_mode|S_IFLNK;
761 err = local_set_xattr(buffer, credp);
766 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
768 ssize_t oldpath_size, write_size;
769 buffer = rpath(fs_ctx, newpath);
770 fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS);
775 /* Write the oldpath (target) to the file. */
776 oldpath_size = strlen(oldpath);
778 write_size = write(fd, (void *)oldpath, oldpath_size);
779 } while (write_size == -1 && errno == EINTR);
781 if (write_size != oldpath_size) {
788 /* Set cleint credentials in symlink's xattr */
789 credp->fc_mode = credp->fc_mode|S_IFLNK;
790 err = local_set_mapped_file_attr(fs_ctx, newpath, credp);
795 } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
796 (fs_ctx->export_flags & V9FS_SM_NONE)) {
797 buffer = rpath(fs_ctx, newpath);
798 err = symlink(oldpath, buffer);
802 err = lchown(buffer, credp->fc_uid, credp->fc_gid);
805 * If we fail to change ownership and if we are
806 * using security model none. Ignore the error
808 if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
822 v9fs_string_free(&fullname);
826 static int local_link(FsContext *ctx, V9fsPath *oldpath,
827 V9fsPath *dirpath, const char *name)
831 char *buffer, *buffer1;
833 v9fs_string_init(&newpath);
834 v9fs_string_sprintf(&newpath, "%s/%s", dirpath->data, name);
836 buffer = rpath(ctx, oldpath->data);
837 buffer1 = rpath(ctx, newpath.data);
838 ret = link(buffer, buffer1);
842 /* now link the virtfs_metadata files */
843 if (!ret && (ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
844 /* Link the .virtfs_metadata files. Create the metada directory */
845 ret = local_create_mapped_attr_dir(ctx, newpath.data);
849 buffer = local_mapped_attr_path(ctx, oldpath->data);
850 buffer1 = local_mapped_attr_path(ctx, newpath.data);
851 ret = link(buffer, buffer1);
854 if (ret < 0 && errno != ENOENT) {
859 v9fs_string_free(&newpath);
863 static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
867 char *path = fs_path->data;
869 buffer = rpath(ctx, path);
870 ret = truncate(buffer, size);
875 static int local_rename(FsContext *ctx, const char *oldpath,
879 char *buffer, *buffer1;
881 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
882 err = local_create_mapped_attr_dir(ctx, newpath);
886 /* rename the .virtfs_metadata files */
887 buffer = local_mapped_attr_path(ctx, oldpath);
888 buffer1 = local_mapped_attr_path(ctx, newpath);
889 err = rename(buffer, buffer1);
892 if (err < 0 && errno != ENOENT) {
897 buffer = rpath(ctx, oldpath);
898 buffer1 = rpath(ctx, newpath);
899 err = rename(buffer, buffer1);
905 static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
909 char *path = fs_path->data;
911 if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
912 (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
913 (fs_ctx->export_flags & V9FS_SM_NONE)) {
914 buffer = rpath(fs_ctx, path);
915 ret = lchown(buffer, credp->fc_uid, credp->fc_gid);
917 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
918 buffer = rpath(fs_ctx, path);
919 ret = local_set_xattr(buffer, credp);
921 } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
922 return local_set_mapped_file_attr(fs_ctx, path, credp);
927 static int local_utimensat(FsContext *s, V9fsPath *fs_path,
928 const struct timespec *buf)
932 char *path = fs_path->data;
934 buffer = rpath(s, path);
935 ret = qemu_utimens(buffer, buf);
940 static int local_remove(FsContext *ctx, const char *path)
946 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
947 buffer = rpath(ctx, path);
948 err = lstat(buffer, &stbuf);
954 * If directory remove .virtfs_metadata contained in the
957 if (S_ISDIR(stbuf.st_mode)) {
958 buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root,
959 path, VIRTFS_META_DIR);
960 err = remove(buffer);
962 if (err < 0 && errno != ENOENT) {
964 * We didn't had the .virtfs_metadata file. May be file created
965 * in non-mapped mode ?. Ignore ENOENT.
971 * Now remove the name from parent directory
972 * .virtfs_metadata directory
974 buffer = local_mapped_attr_path(ctx, path);
975 err = remove(buffer);
977 if (err < 0 && errno != ENOENT) {
979 * We didn't had the .virtfs_metadata file. May be file created
980 * in non-mapped mode ?. Ignore ENOENT.
986 buffer = rpath(ctx, path);
987 err = remove(buffer);
993 static int local_fsync(FsContext *ctx, int fid_type,
994 V9fsFidOpenState *fs, int datasync)
998 if (fid_type == P9_FID_DIR) {
1005 return qemu_fdatasync(fd);
1011 static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf)
1015 char *path = fs_path->data;
1017 buffer = rpath(s, path);
1018 ret = statfs(buffer, stbuf);
1023 static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
1024 const char *name, void *value, size_t size)
1026 char *path = fs_path->data;
1028 return v9fs_get_xattr(ctx, path, name, value, size);
1031 static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path,
1032 void *value, size_t size)
1034 char *path = fs_path->data;
1036 return v9fs_list_xattr(ctx, path, value, size);
1039 static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
1040 void *value, size_t size, int flags)
1042 char *path = fs_path->data;
1044 return v9fs_set_xattr(ctx, path, name, value, size, flags);
1047 static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
1050 char *path = fs_path->data;
1052 return v9fs_remove_xattr(ctx, path, name);
1055 static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path,
1056 const char *name, V9fsPath *target)
1059 v9fs_string_sprintf((V9fsString *)target, "%s/%s",
1060 dir_path->data, name);
1062 v9fs_string_sprintf((V9fsString *)target, "%s", name);
1064 /* Bump the size for including terminating NULL */
1069 static int local_renameat(FsContext *ctx, V9fsPath *olddir,
1070 const char *old_name, V9fsPath *newdir,
1071 const char *new_name)
1074 V9fsString old_full_name, new_full_name;
1076 v9fs_string_init(&old_full_name);
1077 v9fs_string_init(&new_full_name);
1079 v9fs_string_sprintf(&old_full_name, "%s/%s", olddir->data, old_name);
1080 v9fs_string_sprintf(&new_full_name, "%s/%s", newdir->data, new_name);
1082 ret = local_rename(ctx, old_full_name.data, new_full_name.data);
1083 v9fs_string_free(&old_full_name);
1084 v9fs_string_free(&new_full_name);
1088 static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
1089 const char *name, int flags)
1092 V9fsString fullname;
1095 v9fs_string_init(&fullname);
1097 v9fs_string_sprintf(&fullname, "%s/%s", dir->data, name);
1098 if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1099 if (flags == AT_REMOVEDIR) {
1101 * If directory remove .virtfs_metadata contained in the
1104 buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root,
1105 fullname.data, VIRTFS_META_DIR);
1106 ret = remove(buffer);
1108 if (ret < 0 && errno != ENOENT) {
1110 * We didn't had the .virtfs_metadata file. May be file created
1111 * in non-mapped mode ?. Ignore ENOENT.
1117 * Now remove the name from parent directory
1118 * .virtfs_metadata directory.
1120 buffer = local_mapped_attr_path(ctx, fullname.data);
1121 ret = remove(buffer);
1123 if (ret < 0 && errno != ENOENT) {
1125 * We didn't had the .virtfs_metadata file. May be file created
1126 * in non-mapped mode ?. Ignore ENOENT.
1131 /* Remove the name finally */
1132 buffer = rpath(ctx, fullname.data);
1133 ret = remove(buffer);
1137 v9fs_string_free(&fullname);
1141 static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
1142 mode_t st_mode, uint64_t *st_gen)
1144 #ifdef FS_IOC_GETVERSION
1146 V9fsFidOpenState fid_open;
1149 * Do not try to open special files like device nodes, fifos etc
1150 * We can get fd for regular files and directories only
1152 if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
1156 err = local_open(ctx, path, O_RDONLY, &fid_open);
1160 err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
1161 local_close(ctx, &fid_open);
1169 static int local_init(FsContext *ctx)
1172 struct statfs stbuf;
1174 if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
1175 ctx->xops = passthrough_xattr_ops;
1176 } else if (ctx->export_flags & V9FS_SM_MAPPED) {
1177 ctx->xops = mapped_xattr_ops;
1178 } else if (ctx->export_flags & V9FS_SM_NONE) {
1179 ctx->xops = none_xattr_ops;
1180 } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1182 * xattr operation for mapped-file and passthrough
1185 ctx->xops = passthrough_xattr_ops;
1187 ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
1188 #ifdef FS_IOC_GETVERSION
1190 * use ioc_getversion only if the iocl is definied
1192 err = statfs(ctx->fs_root, &stbuf);
1194 switch (stbuf.f_type) {
1195 case EXT2_SUPER_MAGIC:
1196 case BTRFS_SUPER_MAGIC:
1197 case REISERFS_SUPER_MAGIC:
1198 case XFS_SUPER_MAGIC:
1199 ctx->exops.get_st_gen = local_ioc_getversion;
1207 static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
1209 const char *sec_model = qemu_opt_get(opts, "security_model");
1210 const char *path = qemu_opt_get(opts, "path");
1213 fprintf(stderr, "security model not specified, "
1214 "local fs needs security model\nvalid options are:"
1215 "\tsecurity_model=[passthrough|mapped|none]\n");
1219 if (!strcmp(sec_model, "passthrough")) {
1220 fse->export_flags |= V9FS_SM_PASSTHROUGH;
1221 } else if (!strcmp(sec_model, "mapped") ||
1222 !strcmp(sec_model, "mapped-xattr")) {
1223 fse->export_flags |= V9FS_SM_MAPPED;
1224 } else if (!strcmp(sec_model, "none")) {
1225 fse->export_flags |= V9FS_SM_NONE;
1226 } else if (!strcmp(sec_model, "mapped-file")) {
1227 fse->export_flags |= V9FS_SM_MAPPED_FILE;
1229 fprintf(stderr, "Invalid security model %s specified, valid options are"
1230 "\n\t [passthrough|mapped-xattr|mapped-file|none]\n",
1236 fprintf(stderr, "fsdev: No path specified.\n");
1239 fse->path = g_strdup(path);
1244 FileOperations local_ops = {
1245 .parse_opts = local_parse_opts,
1247 .lstat = local_lstat,
1248 .readlink = local_readlink,
1249 .close = local_close,
1250 .closedir = local_closedir,
1252 .opendir = local_opendir,
1253 .rewinddir = local_rewinddir,
1254 .telldir = local_telldir,
1255 .readdir_r = local_readdir_r,
1256 .seekdir = local_seekdir,
1257 .preadv = local_preadv,
1258 .pwritev = local_pwritev,
1259 .chmod = local_chmod,
1260 .mknod = local_mknod,
1261 .mkdir = local_mkdir,
1262 .fstat = local_fstat,
1263 .open2 = local_open2,
1264 .symlink = local_symlink,
1266 .truncate = local_truncate,
1267 .rename = local_rename,
1268 .chown = local_chown,
1269 .utimensat = local_utimensat,
1270 .remove = local_remove,
1271 .fsync = local_fsync,
1272 .statfs = local_statfs,
1273 .lgetxattr = local_lgetxattr,
1274 .llistxattr = local_llistxattr,
1275 .lsetxattr = local_lsetxattr,
1276 .lremovexattr = local_lremovexattr,
1277 .name_to_path = local_name_to_path,
1278 .renameat = local_renameat,
1279 .unlinkat = local_unlinkat,