diff options
Diffstat (limited to 'qemu/hw/9pfs/9p-local.c')
| -rw-r--r-- | qemu/hw/9pfs/9p-local.c | 1282 |
1 files changed, 1282 insertions, 0 deletions
diff --git a/qemu/hw/9pfs/9p-local.c b/qemu/hw/9pfs/9p-local.c new file mode 100644 index 000000000..16f45f485 --- /dev/null +++ b/qemu/hw/9pfs/9p-local.c @@ -0,0 +1,1282 @@ +/* + * 9p Posix callback + * + * Copyright IBM, Corp. 2010 + * + * Authors: + * Anthony Liguori <aliguori@us.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#include "qemu/osdep.h" +#include "9p.h" +#include "9p-xattr.h" +#include "fsdev/qemu-fsdev.h" /* local_ops */ +#include <arpa/inet.h> +#include <pwd.h> +#include <grp.h> +#include <sys/socket.h> +#include <sys/un.h> +#include "qemu/xattr.h" +#include "qemu/cutils.h" +#include "qemu/error-report.h" +#include <libgen.h> +#include <linux/fs.h> +#ifdef CONFIG_LINUX_MAGIC_H +#include <linux/magic.h> +#endif +#include <sys/ioctl.h> + +#ifndef XFS_SUPER_MAGIC +#define XFS_SUPER_MAGIC 0x58465342 +#endif +#ifndef EXT2_SUPER_MAGIC +#define EXT2_SUPER_MAGIC 0xEF53 +#endif +#ifndef REISERFS_SUPER_MAGIC +#define REISERFS_SUPER_MAGIC 0x52654973 +#endif +#ifndef BTRFS_SUPER_MAGIC +#define BTRFS_SUPER_MAGIC 0x9123683E +#endif + +#define VIRTFS_META_DIR ".virtfs_metadata" + +static char *local_mapped_attr_path(FsContext *ctx, const char *path) +{ + int dirlen; + const char *name = strrchr(path, '/'); + if (name) { + dirlen = name - path; + ++name; + } else { + name = path; + dirlen = 0; + } + return g_strdup_printf("%s/%.*s/%s/%s", ctx->fs_root, + dirlen, path, VIRTFS_META_DIR, name); +} + +static FILE *local_fopen(const char *path, const char *mode) +{ + int fd, o_mode = 0; + FILE *fp; + int flags = O_NOFOLLOW; + /* + * only supports two modes + */ + if (mode[0] == 'r') { + flags |= O_RDONLY; + } else if (mode[0] == 'w') { + flags |= O_WRONLY | O_TRUNC | O_CREAT; + o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; + } else { + return NULL; + } + fd = open(path, flags, o_mode); + if (fd == -1) { + return NULL; + } + fp = fdopen(fd, mode); + if (!fp) { + close(fd); + } + return fp; +} + +#define ATTR_MAX 100 +static void local_mapped_file_attr(FsContext *ctx, const char *path, + struct stat *stbuf) +{ + FILE *fp; + char buf[ATTR_MAX]; + char *attr_path; + + attr_path = local_mapped_attr_path(ctx, path); + fp = local_fopen(attr_path, "r"); + g_free(attr_path); + if (!fp) { + return; + } + memset(buf, 0, ATTR_MAX); + while (fgets(buf, ATTR_MAX, fp)) { + if (!strncmp(buf, "virtfs.uid", 10)) { + stbuf->st_uid = atoi(buf+11); + } else if (!strncmp(buf, "virtfs.gid", 10)) { + stbuf->st_gid = atoi(buf+11); + } else if (!strncmp(buf, "virtfs.mode", 11)) { + stbuf->st_mode = atoi(buf+12); + } else if (!strncmp(buf, "virtfs.rdev", 11)) { + stbuf->st_rdev = atoi(buf+12); + } + memset(buf, 0, ATTR_MAX); + } + fclose(fp); +} + +static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf) +{ + int err; + char *buffer; + char *path = fs_path->data; + + buffer = rpath(fs_ctx, path); + err = lstat(buffer, stbuf); + if (err) { + goto err_out; + } + if (fs_ctx->export_flags & V9FS_SM_MAPPED) { + /* Actual credentials are part of extended attrs */ + uid_t tmp_uid; + gid_t tmp_gid; + mode_t tmp_mode; + dev_t tmp_dev; + if (getxattr(buffer, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) { + stbuf->st_uid = le32_to_cpu(tmp_uid); + } + if (getxattr(buffer, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) { + stbuf->st_gid = le32_to_cpu(tmp_gid); + } + if (getxattr(buffer, "user.virtfs.mode", + &tmp_mode, sizeof(mode_t)) > 0) { + stbuf->st_mode = le32_to_cpu(tmp_mode); + } + if (getxattr(buffer, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) { + stbuf->st_rdev = le64_to_cpu(tmp_dev); + } + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { + local_mapped_file_attr(fs_ctx, path, stbuf); + } + +err_out: + g_free(buffer); + return err; +} + +static int local_create_mapped_attr_dir(FsContext *ctx, const char *path) +{ + int err; + char *attr_dir; + char *tmp_path = g_strdup(path); + + attr_dir = g_strdup_printf("%s/%s/%s", + ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR); + + err = mkdir(attr_dir, 0700); + if (err < 0 && errno == EEXIST) { + err = 0; + } + g_free(attr_dir); + g_free(tmp_path); + return err; +} + +static int local_set_mapped_file_attr(FsContext *ctx, + const char *path, FsCred *credp) +{ + FILE *fp; + int ret = 0; + char buf[ATTR_MAX]; + char *attr_path; + int uid = -1, gid = -1, mode = -1, rdev = -1; + + attr_path = local_mapped_attr_path(ctx, path); + fp = local_fopen(attr_path, "r"); + if (!fp) { + goto create_map_file; + } + memset(buf, 0, ATTR_MAX); + while (fgets(buf, ATTR_MAX, fp)) { + if (!strncmp(buf, "virtfs.uid", 10)) { + uid = atoi(buf+11); + } else if (!strncmp(buf, "virtfs.gid", 10)) { + gid = atoi(buf+11); + } else if (!strncmp(buf, "virtfs.mode", 11)) { + mode = atoi(buf+12); + } else if (!strncmp(buf, "virtfs.rdev", 11)) { + rdev = atoi(buf+12); + } + memset(buf, 0, ATTR_MAX); + } + fclose(fp); + goto update_map_file; + +create_map_file: + ret = local_create_mapped_attr_dir(ctx, path); + if (ret < 0) { + goto err_out; + } + +update_map_file: + fp = local_fopen(attr_path, "w"); + if (!fp) { + ret = -1; + goto err_out; + } + + if (credp->fc_uid != -1) { + uid = credp->fc_uid; + } + if (credp->fc_gid != -1) { + gid = credp->fc_gid; + } + if (credp->fc_mode != -1) { + mode = credp->fc_mode; + } + if (credp->fc_rdev != -1) { + rdev = credp->fc_rdev; + } + + + if (uid != -1) { + fprintf(fp, "virtfs.uid=%d\n", uid); + } + if (gid != -1) { + fprintf(fp, "virtfs.gid=%d\n", gid); + } + if (mode != -1) { + fprintf(fp, "virtfs.mode=%d\n", mode); + } + if (rdev != -1) { + fprintf(fp, "virtfs.rdev=%d\n", rdev); + } + fclose(fp); + +err_out: + g_free(attr_path); + return ret; +} + +static int local_set_xattr(const char *path, FsCred *credp) +{ + int err; + + if (credp->fc_uid != -1) { + uint32_t tmp_uid = cpu_to_le32(credp->fc_uid); + err = setxattr(path, "user.virtfs.uid", &tmp_uid, sizeof(uid_t), 0); + if (err) { + return err; + } + } + if (credp->fc_gid != -1) { + uint32_t tmp_gid = cpu_to_le32(credp->fc_gid); + err = setxattr(path, "user.virtfs.gid", &tmp_gid, sizeof(gid_t), 0); + if (err) { + return err; + } + } + if (credp->fc_mode != -1) { + uint32_t tmp_mode = cpu_to_le32(credp->fc_mode); + err = setxattr(path, "user.virtfs.mode", &tmp_mode, sizeof(mode_t), 0); + if (err) { + return err; + } + } + if (credp->fc_rdev != -1) { + uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev); + err = setxattr(path, "user.virtfs.rdev", &tmp_rdev, sizeof(dev_t), 0); + if (err) { + return err; + } + } + return 0; +} + +static int local_post_create_passthrough(FsContext *fs_ctx, const char *path, + FsCred *credp) +{ + char *buffer; + + buffer = rpath(fs_ctx, path); + if (lchown(buffer, credp->fc_uid, credp->fc_gid) < 0) { + /* + * If we fail to change ownership and if we are + * using security model none. Ignore the error + */ + if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) { + goto err; + } + } + + if (chmod(buffer, credp->fc_mode & 07777) < 0) { + goto err; + } + + g_free(buffer); + return 0; +err: + g_free(buffer); + return -1; +} + +static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path, + char *buf, size_t bufsz) +{ + ssize_t tsize = -1; + char *buffer; + char *path = fs_path->data; + + if ((fs_ctx->export_flags & V9FS_SM_MAPPED) || + (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) { + int fd; + buffer = rpath(fs_ctx, path); + fd = open(buffer, O_RDONLY | O_NOFOLLOW); + g_free(buffer); + if (fd == -1) { + return -1; + } + do { + tsize = read(fd, (void *)buf, bufsz); + } while (tsize == -1 && errno == EINTR); + close(fd); + } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || + (fs_ctx->export_flags & V9FS_SM_NONE)) { + buffer = rpath(fs_ctx, path); + tsize = readlink(buffer, buf, bufsz); + g_free(buffer); + } + return tsize; +} + +static int local_close(FsContext *ctx, V9fsFidOpenState *fs) +{ + return close(fs->fd); +} + +static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs) +{ + return closedir(fs->dir); +} + +static int local_open(FsContext *ctx, V9fsPath *fs_path, + int flags, V9fsFidOpenState *fs) +{ + char *buffer; + char *path = fs_path->data; + + buffer = rpath(ctx, path); + fs->fd = open(buffer, flags | O_NOFOLLOW); + g_free(buffer); + return fs->fd; +} + +static int local_opendir(FsContext *ctx, + V9fsPath *fs_path, V9fsFidOpenState *fs) +{ + char *buffer; + char *path = fs_path->data; + + buffer = rpath(ctx, path); + fs->dir = opendir(buffer); + g_free(buffer); + if (!fs->dir) { + return -1; + } + return 0; +} + +static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs) +{ + rewinddir(fs->dir); +} + +static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs) +{ + return telldir(fs->dir); +} + +static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs, + struct dirent *entry, + struct dirent **result) +{ + int ret; + +again: + ret = readdir_r(fs->dir, entry, result); + if (ctx->export_flags & V9FS_SM_MAPPED) { + entry->d_type = DT_UNKNOWN; + } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { + if (!ret && *result != NULL && + !strcmp(entry->d_name, VIRTFS_META_DIR)) { + /* skp the meta data directory */ + goto again; + } + entry->d_type = DT_UNKNOWN; + } + return ret; +} + +static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off) +{ + seekdir(fs->dir, off); +} + +static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs, + const struct iovec *iov, + int iovcnt, off_t offset) +{ +#ifdef CONFIG_PREADV + return preadv(fs->fd, iov, iovcnt, offset); +#else + int err = lseek(fs->fd, offset, SEEK_SET); + if (err == -1) { + return err; + } else { + return readv(fs->fd, iov, iovcnt); + } +#endif +} + +static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs, + const struct iovec *iov, + int iovcnt, off_t offset) +{ + ssize_t ret +; +#ifdef CONFIG_PREADV + ret = pwritev(fs->fd, iov, iovcnt, offset); +#else + int err = lseek(fs->fd, offset, SEEK_SET); + if (err == -1) { + return err; + } else { + ret = writev(fs->fd, iov, iovcnt); + } +#endif +#ifdef CONFIG_SYNC_FILE_RANGE + if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) { + /* + * Initiate a writeback. This is not a data integrity sync. + * We want to ensure that we don't leave dirty pages in the cache + * after write when writeout=immediate is sepcified. + */ + sync_file_range(fs->fd, offset, ret, + SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE); + } +#endif + return ret; +} + +static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) +{ + char *buffer; + int ret = -1; + char *path = fs_path->data; + + if (fs_ctx->export_flags & V9FS_SM_MAPPED) { + buffer = rpath(fs_ctx, path); + ret = local_set_xattr(buffer, credp); + g_free(buffer); + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { + return local_set_mapped_file_attr(fs_ctx, path, credp); + } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || + (fs_ctx->export_flags & V9FS_SM_NONE)) { + buffer = rpath(fs_ctx, path); + ret = chmod(buffer, credp->fc_mode); + g_free(buffer); + } + return ret; +} + +static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path, + const char *name, FsCred *credp) +{ + char *path; + int err = -1; + int serrno = 0; + V9fsString fullname; + char *buffer = NULL; + + v9fs_string_init(&fullname); + v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name); + path = fullname.data; + + /* Determine the security model */ + if (fs_ctx->export_flags & V9FS_SM_MAPPED) { + buffer = rpath(fs_ctx, path); + err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0); + if (err == -1) { + goto out; + } + err = local_set_xattr(buffer, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { + + buffer = rpath(fs_ctx, path); + err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0); + if (err == -1) { + goto out; + } + err = local_set_mapped_file_attr(fs_ctx, path, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || + (fs_ctx->export_flags & V9FS_SM_NONE)) { + buffer = rpath(fs_ctx, path); + err = mknod(buffer, credp->fc_mode, credp->fc_rdev); + if (err == -1) { + goto out; + } + err = local_post_create_passthrough(fs_ctx, path, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } + goto out; + +err_end: + remove(buffer); + errno = serrno; +out: + g_free(buffer); + v9fs_string_free(&fullname); + return err; +} + +static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path, + const char *name, FsCred *credp) +{ + char *path; + int err = -1; + int serrno = 0; + V9fsString fullname; + char *buffer = NULL; + + v9fs_string_init(&fullname); + v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name); + path = fullname.data; + + /* Determine the security model */ + if (fs_ctx->export_flags & V9FS_SM_MAPPED) { + buffer = rpath(fs_ctx, path); + err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS); + if (err == -1) { + goto out; + } + credp->fc_mode = credp->fc_mode|S_IFDIR; + err = local_set_xattr(buffer, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { + buffer = rpath(fs_ctx, path); + err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS); + if (err == -1) { + goto out; + } + credp->fc_mode = credp->fc_mode|S_IFDIR; + err = local_set_mapped_file_attr(fs_ctx, path, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || + (fs_ctx->export_flags & V9FS_SM_NONE)) { + buffer = rpath(fs_ctx, path); + err = mkdir(buffer, credp->fc_mode); + if (err == -1) { + goto out; + } + err = local_post_create_passthrough(fs_ctx, path, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } + goto out; + +err_end: + remove(buffer); + errno = serrno; +out: + g_free(buffer); + v9fs_string_free(&fullname); + return err; +} + +static int local_fstat(FsContext *fs_ctx, int fid_type, + V9fsFidOpenState *fs, struct stat *stbuf) +{ + int err, fd; + + if (fid_type == P9_FID_DIR) { + fd = dirfd(fs->dir); + } else { + fd = fs->fd; + } + + err = fstat(fd, stbuf); + if (err) { + return err; + } + if (fs_ctx->export_flags & V9FS_SM_MAPPED) { + /* Actual credentials are part of extended attrs */ + uid_t tmp_uid; + gid_t tmp_gid; + mode_t tmp_mode; + dev_t tmp_dev; + + if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) { + stbuf->st_uid = le32_to_cpu(tmp_uid); + } + if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) { + stbuf->st_gid = le32_to_cpu(tmp_gid); + } + if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) { + stbuf->st_mode = le32_to_cpu(tmp_mode); + } + if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) { + stbuf->st_rdev = le64_to_cpu(tmp_dev); + } + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { + errno = EOPNOTSUPP; + return -1; + } + return err; +} + +static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name, + int flags, FsCred *credp, V9fsFidOpenState *fs) +{ + char *path; + int fd = -1; + int err = -1; + int serrno = 0; + V9fsString fullname; + char *buffer = NULL; + + /* + * Mark all the open to not follow symlinks + */ + flags |= O_NOFOLLOW; + + v9fs_string_init(&fullname); + v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name); + path = fullname.data; + + /* Determine the security model */ + if (fs_ctx->export_flags & V9FS_SM_MAPPED) { + buffer = rpath(fs_ctx, path); + fd = open(buffer, flags, SM_LOCAL_MODE_BITS); + if (fd == -1) { + err = fd; + goto out; + } + credp->fc_mode = credp->fc_mode|S_IFREG; + /* Set cleint credentials in xattr */ + err = local_set_xattr(buffer, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { + buffer = rpath(fs_ctx, path); + fd = open(buffer, flags, SM_LOCAL_MODE_BITS); + if (fd == -1) { + err = fd; + goto out; + } + credp->fc_mode = credp->fc_mode|S_IFREG; + /* Set client credentials in .virtfs_metadata directory files */ + err = local_set_mapped_file_attr(fs_ctx, path, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || + (fs_ctx->export_flags & V9FS_SM_NONE)) { + buffer = rpath(fs_ctx, path); + fd = open(buffer, flags, credp->fc_mode); + if (fd == -1) { + err = fd; + goto out; + } + err = local_post_create_passthrough(fs_ctx, path, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } + err = fd; + fs->fd = fd; + goto out; + +err_end: + close(fd); + remove(buffer); + errno = serrno; +out: + g_free(buffer); + v9fs_string_free(&fullname); + return err; +} + + +static int local_symlink(FsContext *fs_ctx, const char *oldpath, + V9fsPath *dir_path, const char *name, FsCred *credp) +{ + int err = -1; + int serrno = 0; + char *newpath; + V9fsString fullname; + char *buffer = NULL; + + v9fs_string_init(&fullname); + v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name); + newpath = fullname.data; + + /* Determine the security model */ + if (fs_ctx->export_flags & V9FS_SM_MAPPED) { + int fd; + ssize_t oldpath_size, write_size; + buffer = rpath(fs_ctx, newpath); + fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS); + if (fd == -1) { + err = fd; + goto out; + } + /* Write the oldpath (target) to the file. */ + oldpath_size = strlen(oldpath); + do { + write_size = write(fd, (void *)oldpath, oldpath_size); + } while (write_size == -1 && errno == EINTR); + + if (write_size != oldpath_size) { + serrno = errno; + close(fd); + err = -1; + goto err_end; + } + close(fd); + /* Set cleint credentials in symlink's xattr */ + credp->fc_mode = credp->fc_mode|S_IFLNK; + err = local_set_xattr(buffer, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { + int fd; + ssize_t oldpath_size, write_size; + buffer = rpath(fs_ctx, newpath); + fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS); + if (fd == -1) { + err = fd; + goto out; + } + /* Write the oldpath (target) to the file. */ + oldpath_size = strlen(oldpath); + do { + write_size = write(fd, (void *)oldpath, oldpath_size); + } while (write_size == -1 && errno == EINTR); + + if (write_size != oldpath_size) { + serrno = errno; + close(fd); + err = -1; + goto err_end; + } + close(fd); + /* Set cleint credentials in symlink's xattr */ + credp->fc_mode = credp->fc_mode|S_IFLNK; + err = local_set_mapped_file_attr(fs_ctx, newpath, credp); + if (err == -1) { + serrno = errno; + goto err_end; + } + } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || + (fs_ctx->export_flags & V9FS_SM_NONE)) { + buffer = rpath(fs_ctx, newpath); + err = symlink(oldpath, buffer); + if (err) { + goto out; + } + err = lchown(buffer, credp->fc_uid, credp->fc_gid); + if (err == -1) { + /* + * If we fail to change ownership and if we are + * using security model none. Ignore the error + */ + if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) { + serrno = errno; + goto err_end; + } else + err = 0; + } + } + goto out; + +err_end: + remove(buffer); + errno = serrno; +out: + g_free(buffer); + v9fs_string_free(&fullname); + return err; +} + +static int local_link(FsContext *ctx, V9fsPath *oldpath, + V9fsPath *dirpath, const char *name) +{ + int ret; + V9fsString newpath; + char *buffer, *buffer1; + + v9fs_string_init(&newpath); + v9fs_string_sprintf(&newpath, "%s/%s", dirpath->data, name); + + buffer = rpath(ctx, oldpath->data); + buffer1 = rpath(ctx, newpath.data); + ret = link(buffer, buffer1); + g_free(buffer); + g_free(buffer1); + + /* now link the virtfs_metadata files */ + if (!ret && (ctx->export_flags & V9FS_SM_MAPPED_FILE)) { + /* Link the .virtfs_metadata files. Create the metada directory */ + ret = local_create_mapped_attr_dir(ctx, newpath.data); + if (ret < 0) { + goto err_out; + } + buffer = local_mapped_attr_path(ctx, oldpath->data); + buffer1 = local_mapped_attr_path(ctx, newpath.data); + ret = link(buffer, buffer1); + g_free(buffer); + g_free(buffer1); + if (ret < 0 && errno != ENOENT) { + goto err_out; + } + } +err_out: + v9fs_string_free(&newpath); + return ret; +} + +static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size) +{ + char *buffer; + int ret; + char *path = fs_path->data; + + buffer = rpath(ctx, path); + ret = truncate(buffer, size); + g_free(buffer); + return ret; +} + +static int local_rename(FsContext *ctx, const char *oldpath, + const char *newpath) +{ + int err; + char *buffer, *buffer1; + + if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { + err = local_create_mapped_attr_dir(ctx, newpath); + if (err < 0) { + return err; + } + /* rename the .virtfs_metadata files */ + buffer = local_mapped_attr_path(ctx, oldpath); + buffer1 = local_mapped_attr_path(ctx, newpath); + err = rename(buffer, buffer1); + g_free(buffer); + g_free(buffer1); + if (err < 0 && errno != ENOENT) { + return err; + } + } + + buffer = rpath(ctx, oldpath); + buffer1 = rpath(ctx, newpath); + err = rename(buffer, buffer1); + g_free(buffer); + g_free(buffer1); + return err; +} + +static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp) +{ + char *buffer; + int ret = -1; + char *path = fs_path->data; + + if ((credp->fc_uid == -1 && credp->fc_gid == -1) || + (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) || + (fs_ctx->export_flags & V9FS_SM_NONE)) { + buffer = rpath(fs_ctx, path); + ret = lchown(buffer, credp->fc_uid, credp->fc_gid); + g_free(buffer); + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) { + buffer = rpath(fs_ctx, path); + ret = local_set_xattr(buffer, credp); + g_free(buffer); + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) { + return local_set_mapped_file_attr(fs_ctx, path, credp); + } + return ret; +} + +static int local_utimensat(FsContext *s, V9fsPath *fs_path, + const struct timespec *buf) +{ + char *buffer; + int ret; + char *path = fs_path->data; + + buffer = rpath(s, path); + ret = qemu_utimens(buffer, buf); + g_free(buffer); + return ret; +} + +static int local_remove(FsContext *ctx, const char *path) +{ + int err; + struct stat stbuf; + char *buffer; + + if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { + buffer = rpath(ctx, path); + err = lstat(buffer, &stbuf); + g_free(buffer); + if (err) { + goto err_out; + } + /* + * If directory remove .virtfs_metadata contained in the + * directory + */ + if (S_ISDIR(stbuf.st_mode)) { + buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root, + path, VIRTFS_META_DIR); + err = remove(buffer); + g_free(buffer); + if (err < 0 && errno != ENOENT) { + /* + * We didn't had the .virtfs_metadata file. May be file created + * in non-mapped mode ?. Ignore ENOENT. + */ + goto err_out; + } + } + /* + * Now remove the name from parent directory + * .virtfs_metadata directory + */ + buffer = local_mapped_attr_path(ctx, path); + err = remove(buffer); + g_free(buffer); + if (err < 0 && errno != ENOENT) { + /* + * We didn't had the .virtfs_metadata file. May be file created + * in non-mapped mode ?. Ignore ENOENT. + */ + goto err_out; + } + } + + buffer = rpath(ctx, path); + err = remove(buffer); + g_free(buffer); +err_out: + return err; +} + +static int local_fsync(FsContext *ctx, int fid_type, + V9fsFidOpenState *fs, int datasync) +{ + int fd; + + if (fid_type == P9_FID_DIR) { + fd = dirfd(fs->dir); + } else { + fd = fs->fd; + } + + if (datasync) { + return qemu_fdatasync(fd); + } else { + return fsync(fd); + } +} + +static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf) +{ + char *buffer; + int ret; + char *path = fs_path->data; + + buffer = rpath(s, path); + ret = statfs(buffer, stbuf); + g_free(buffer); + return ret; +} + +static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path, + const char *name, void *value, size_t size) +{ + char *path = fs_path->data; + + return v9fs_get_xattr(ctx, path, name, value, size); +} + +static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path, + void *value, size_t size) +{ + char *path = fs_path->data; + + return v9fs_list_xattr(ctx, path, value, size); +} + +static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name, + void *value, size_t size, int flags) +{ + char *path = fs_path->data; + + return v9fs_set_xattr(ctx, path, name, value, size, flags); +} + +static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path, + const char *name) +{ + char *path = fs_path->data; + + return v9fs_remove_xattr(ctx, path, name); +} + +static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path, + const char *name, V9fsPath *target) +{ + if (dir_path) { + v9fs_string_sprintf((V9fsString *)target, "%s/%s", + dir_path->data, name); + } else { + v9fs_string_sprintf((V9fsString *)target, "%s", name); + } + /* Bump the size for including terminating NULL */ + target->size++; + return 0; +} + +static int local_renameat(FsContext *ctx, V9fsPath *olddir, + const char *old_name, V9fsPath *newdir, + const char *new_name) +{ + int ret; + V9fsString old_full_name, new_full_name; + + v9fs_string_init(&old_full_name); + v9fs_string_init(&new_full_name); + + v9fs_string_sprintf(&old_full_name, "%s/%s", olddir->data, old_name); + v9fs_string_sprintf(&new_full_name, "%s/%s", newdir->data, new_name); + + ret = local_rename(ctx, old_full_name.data, new_full_name.data); + v9fs_string_free(&old_full_name); + v9fs_string_free(&new_full_name); + return ret; +} + +static int local_unlinkat(FsContext *ctx, V9fsPath *dir, + const char *name, int flags) +{ + int ret; + V9fsString fullname; + char *buffer; + + v9fs_string_init(&fullname); + + v9fs_string_sprintf(&fullname, "%s/%s", dir->data, name); + if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { + if (flags == AT_REMOVEDIR) { + /* + * If directory remove .virtfs_metadata contained in the + * directory + */ + buffer = g_strdup_printf("%s/%s/%s", ctx->fs_root, + fullname.data, VIRTFS_META_DIR); + ret = remove(buffer); + g_free(buffer); + if (ret < 0 && errno != ENOENT) { + /* + * We didn't had the .virtfs_metadata file. May be file created + * in non-mapped mode ?. Ignore ENOENT. + */ + goto err_out; + } + } + /* + * Now remove the name from parent directory + * .virtfs_metadata directory. + */ + buffer = local_mapped_attr_path(ctx, fullname.data); + ret = remove(buffer); + g_free(buffer); + if (ret < 0 && errno != ENOENT) { + /* + * We didn't had the .virtfs_metadata file. May be file created + * in non-mapped mode ?. Ignore ENOENT. + */ + goto err_out; + } + } + /* Remove the name finally */ + buffer = rpath(ctx, fullname.data); + ret = remove(buffer); + g_free(buffer); + +err_out: + v9fs_string_free(&fullname); + return ret; +} + +static int local_ioc_getversion(FsContext *ctx, V9fsPath *path, + mode_t st_mode, uint64_t *st_gen) +{ +#ifdef FS_IOC_GETVERSION + int err; + V9fsFidOpenState fid_open; + + /* + * Do not try to open special files like device nodes, fifos etc + * We can get fd for regular files and directories only + */ + if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) { + errno = ENOTTY; + return -1; + } + err = local_open(ctx, path, O_RDONLY, &fid_open); + if (err < 0) { + return err; + } + err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen); + local_close(ctx, &fid_open); + return err; +#else + errno = ENOTTY; + return -1; +#endif +} + +static int local_init(FsContext *ctx) +{ + int err = 0; + struct statfs stbuf; + + if (ctx->export_flags & V9FS_SM_PASSTHROUGH) { + ctx->xops = passthrough_xattr_ops; + } else if (ctx->export_flags & V9FS_SM_MAPPED) { + ctx->xops = mapped_xattr_ops; + } else if (ctx->export_flags & V9FS_SM_NONE) { + ctx->xops = none_xattr_ops; + } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) { + /* + * xattr operation for mapped-file and passthrough + * remain same. + */ + ctx->xops = passthrough_xattr_ops; + } + ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT; +#ifdef FS_IOC_GETVERSION + /* + * use ioc_getversion only if the iocl is definied + */ + err = statfs(ctx->fs_root, &stbuf); + if (!err) { + switch (stbuf.f_type) { + case EXT2_SUPER_MAGIC: + case BTRFS_SUPER_MAGIC: + case REISERFS_SUPER_MAGIC: + case XFS_SUPER_MAGIC: + ctx->exops.get_st_gen = local_ioc_getversion; + break; + } + } +#endif + return err; +} + +static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse) +{ + const char *sec_model = qemu_opt_get(opts, "security_model"); + const char *path = qemu_opt_get(opts, "path"); + + if (!sec_model) { + error_report("Security model not specified, local fs needs security model"); + error_printf("valid options are:" + "\tsecurity_model=[passthrough|mapped-xattr|mapped-file|none]\n"); + return -1; + } + + if (!strcmp(sec_model, "passthrough")) { + fse->export_flags |= V9FS_SM_PASSTHROUGH; + } else if (!strcmp(sec_model, "mapped") || + !strcmp(sec_model, "mapped-xattr")) { + fse->export_flags |= V9FS_SM_MAPPED; + } else if (!strcmp(sec_model, "none")) { + fse->export_flags |= V9FS_SM_NONE; + } else if (!strcmp(sec_model, "mapped-file")) { + fse->export_flags |= V9FS_SM_MAPPED_FILE; + } else { + error_report("Invalid security model %s specified", sec_model); + error_printf("valid options are:" + "\t[passthrough|mapped-xattr|mapped-file|none]\n"); + return -1; + } + + if (!path) { + error_report("fsdev: No path specified"); + return -1; + } + fse->path = g_strdup(path); + + return 0; +} + +FileOperations local_ops = { + .parse_opts = local_parse_opts, + .init = local_init, + .lstat = local_lstat, + .readlink = local_readlink, + .close = local_close, + .closedir = local_closedir, + .open = local_open, + .opendir = local_opendir, + .rewinddir = local_rewinddir, + .telldir = local_telldir, + .readdir_r = local_readdir_r, + .seekdir = local_seekdir, + .preadv = local_preadv, + .pwritev = local_pwritev, + .chmod = local_chmod, + .mknod = local_mknod, + .mkdir = local_mkdir, + .fstat = local_fstat, + .open2 = local_open2, + .symlink = local_symlink, + .link = local_link, + .truncate = local_truncate, + .rename = local_rename, + .chown = local_chown, + .utimensat = local_utimensat, + .remove = local_remove, + .fsync = local_fsync, + .statfs = local_statfs, + .lgetxattr = local_lgetxattr, + .llistxattr = local_llistxattr, + .lsetxattr = local_lsetxattr, + .lremovexattr = local_lremovexattr, + .name_to_path = local_name_to_path, + .renameat = local_renameat, + .unlinkat = local_unlinkat, +}; |