Once we let lo_inode.fd be optional, we will need its users to open the file handle stored in lo_inode instead. This function will do that.
For now, it just returns lo_inode.fd, though. Signed-off-by: Max Reitz <mre...@redhat.com> Reviewed-by: Connor Kuehl <cku...@redhat.com> --- tools/virtiofsd/passthrough_ll.c | 138 ++++++++++++++++++++++++++----- 1 file changed, 117 insertions(+), 21 deletions(-) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c index 436f771d2a..46c9dfe200 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -629,6 +629,16 @@ static struct lo_inode *lo_inode(fuse_req_t req, fuse_ino_t ino) return elem->inode; } +static int lo_inode_fd(const struct lo_inode *inode, TempFd *tfd) +{ + *tfd = (TempFd) { + .fd = inode->fd, + .owned = false, + }; + + return 0; +} + /* * TODO Remove this helper and force callers to hold an inode refcount until * they are done with the fd. This will be done in a later patch to make @@ -790,11 +800,11 @@ static int lo_fi_fd(fuse_req_t req, struct fuse_file_info *fi) static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr, int valid, struct fuse_file_info *fi) { + g_auto(TempFd) inode_fd = TEMP_FD_INIT; int saverr; char procname[64]; struct lo_data *lo = lo_data(req); struct lo_inode *inode; - int ifd; int res; int fd = -1; @@ -804,7 +814,11 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr, return; } - ifd = inode->fd; + res = lo_inode_fd(inode, &inode_fd); + if (res < 0) { + saverr = -res; + goto out_err; + } /* If fi->fh is invalid we'll report EBADF later */ if (fi) { @@ -815,7 +829,7 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr, if (fi) { res = fchmod(fd, attr->st_mode); } else { - sprintf(procname, "%i", ifd); + sprintf(procname, "%i", inode_fd.fd); res = fchmodat(lo->proc_self_fd, procname, attr->st_mode, 0); } if (res == -1) { @@ -827,12 +841,13 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr, uid_t uid = (valid & FUSE_SET_ATTR_UID) ? attr->st_uid : (uid_t)-1; gid_t gid = (valid & FUSE_SET_ATTR_GID) ? attr->st_gid : (gid_t)-1; - saverr = drop_security_capability(lo, ifd); + saverr = drop_security_capability(lo, inode_fd.fd); if (saverr) { goto out_err; } - res = fchownat(ifd, "", uid, gid, AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW); + res = fchownat(inode_fd.fd, "", uid, gid, + AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW); if (res == -1) { saverr = errno; goto out_err; @@ -911,7 +926,7 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr, if (fi) { res = futimens(fd, tv); } else { - sprintf(procname, "%i", inode->fd); + sprintf(procname, "%i", inode_fd.fd); res = utimensat(lo->proc_self_fd, procname, tv, 0); } if (res == -1) { @@ -1026,7 +1041,8 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name, struct fuse_entry_param *e, struct lo_inode **inodep) { - int newfd; + g_auto(TempFd) dir_fd = TEMP_FD_INIT; + int newfd = -1; int res; int saverr; uint64_t mnt_id; @@ -1056,7 +1072,13 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name, name = "."; } - newfd = openat(dir->fd, name, O_PATH | O_NOFOLLOW); + res = lo_inode_fd(dir, &dir_fd); + if (res < 0) { + saverr = -res; + goto out; + } + + newfd = openat(dir_fd.fd, name, O_PATH | O_NOFOLLOW); if (newfd == -1) { goto out_err; } @@ -1123,6 +1145,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name, out_err: saverr = errno; +out: if (newfd != -1) { close(newfd); } @@ -1228,6 +1251,7 @@ static void lo_mknod_symlink(fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, dev_t rdev, const char *link) { + g_auto(TempFd) dir_fd = TEMP_FD_INIT; int res; int saverr; struct lo_data *lo = lo_data(req); @@ -1251,12 +1275,18 @@ static void lo_mknod_symlink(fuse_req_t req, fuse_ino_t parent, return; } + res = lo_inode_fd(dir, &dir_fd); + if (res < 0) { + saverr = -res; + goto out; + } + saverr = lo_change_cred(req, &old); if (saverr) { goto out; } - res = mknod_wrapper(dir->fd, name, link, mode, rdev); + res = mknod_wrapper(dir_fd.fd, name, link, mode, rdev); saverr = errno; @@ -1304,6 +1334,8 @@ static void lo_symlink(fuse_req_t req, const char *link, fuse_ino_t parent, static void lo_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t parent, const char *name) { + g_auto(TempFd) inode_fd = TEMP_FD_INIT; + g_auto(TempFd) parent_fd = TEMP_FD_INIT; int res; struct lo_data *lo = lo_data(req); struct lo_inode *parent_inode; @@ -1329,18 +1361,31 @@ static void lo_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t parent, goto out_err; } + res = lo_inode_fd(inode, &inode_fd); + if (res < 0) { + errno = -res; + goto out_err; + } + + res = lo_inode_fd(parent_inode, &parent_fd); + if (res < 0) { + errno = -res; + goto out_err; + } + memset(&e, 0, sizeof(struct fuse_entry_param)); e.attr_timeout = lo->timeout; e.entry_timeout = lo->timeout; - sprintf(procname, "%i", inode->fd); - res = linkat(lo->proc_self_fd, procname, parent_inode->fd, name, + sprintf(procname, "%i", inode_fd.fd); + res = linkat(lo->proc_self_fd, procname, parent_fd.fd, name, AT_SYMLINK_FOLLOW); if (res == -1) { goto out_err; } - res = fstatat(inode->fd, "", &e.attr, AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW); + res = fstatat(inode_fd.fd, "", &e.attr, + AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW); if (res == -1) { goto out_err; } @@ -1369,6 +1414,7 @@ out_err: static struct lo_inode *lookup_name(fuse_req_t req, fuse_ino_t parent, const char *name) { + g_auto(TempFd) dir_fd = TEMP_FD_INIT; int res; uint64_t mnt_id; struct stat attr; @@ -1379,7 +1425,12 @@ static struct lo_inode *lookup_name(fuse_req_t req, fuse_ino_t parent, return NULL; } - res = do_statx(lo, dir->fd, name, &attr, AT_SYMLINK_NOFOLLOW, &mnt_id); + res = lo_inode_fd(dir, &dir_fd); + if (res < 0) { + return NULL; + } + + res = do_statx(lo, dir_fd.fd, name, &attr, AT_SYMLINK_NOFOLLOW, &mnt_id); lo_inode_put(lo, &dir); if (res == -1) { return NULL; @@ -1421,6 +1472,8 @@ static void lo_rename(fuse_req_t req, fuse_ino_t parent, const char *name, fuse_ino_t newparent, const char *newname, unsigned int flags) { + g_auto(TempFd) parent_fd = TEMP_FD_INIT; + g_auto(TempFd) newparent_fd = TEMP_FD_INIT; int res; struct lo_inode *parent_inode; struct lo_inode *newparent_inode; @@ -1453,12 +1506,24 @@ static void lo_rename(fuse_req_t req, fuse_ino_t parent, const char *name, goto out; } + res = lo_inode_fd(parent_inode, &parent_fd); + if (res < 0) { + fuse_reply_err(req, -res); + goto out; + } + + res = lo_inode_fd(newparent_inode, &newparent_fd); + if (res < 0) { + fuse_reply_err(req, -res); + goto out; + } + if (flags) { #ifndef SYS_renameat2 fuse_reply_err(req, EINVAL); #else - res = syscall(SYS_renameat2, parent_inode->fd, name, - newparent_inode->fd, newname, flags); + res = syscall(SYS_renameat2, parent_fd.fd, name, + newparent_fd.fd, newname, flags); if (res == -1 && errno == ENOSYS) { fuse_reply_err(req, EINVAL); } else { @@ -1468,7 +1533,7 @@ static void lo_rename(fuse_req_t req, fuse_ino_t parent, const char *name, goto out; } - res = renameat(parent_inode->fd, name, newparent_inode->fd, newname); + res = renameat(parent_fd.fd, name, newparent_fd.fd, newname); fuse_reply_err(req, res == -1 ? errno : 0); out: @@ -1953,6 +2018,7 @@ static int lo_do_open(struct lo_data *lo, struct lo_inode *inode, static void lo_create(fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, struct fuse_file_info *fi) { + g_auto(TempFd) parent_fd = TEMP_FD_INIT; int fd = -1; struct lo_data *lo = lo_data(req); struct lo_inode *parent_inode; @@ -1975,6 +2041,12 @@ static void lo_create(fuse_req_t req, fuse_ino_t parent, const char *name, return; } + err = lo_inode_fd(parent_inode, &parent_fd); + if (err < 0) { + err = -err; + goto out; + } + err = lo_change_cred(req, &old); if (err) { goto out; @@ -1983,7 +2055,7 @@ static void lo_create(fuse_req_t req, fuse_ino_t parent, const char *name, update_open_flags(lo->writeback, lo->allow_direct_io, fi); /* Try to create a new file but don't open existing files */ - fd = openat(parent_inode->fd, name, fi->flags | O_CREAT | O_EXCL, mode); + fd = openat(parent_fd.fd, name, fi->flags | O_CREAT | O_EXCL, mode); err = fd == -1 ? errno : 0; lo_restore_cred(&old); @@ -2788,6 +2860,7 @@ static int xattr_map_server(const struct lo_data *lo, const char *server_name, static void lo_getxattr(fuse_req_t req, fuse_ino_t ino, const char *in_name, size_t size) { + g_auto(TempFd) inode_fd = TEMP_FD_INIT; struct lo_data *lo = lo_data(req); g_autofree char *value = NULL; char procname[64]; @@ -2850,7 +2923,12 @@ static void lo_getxattr(fuse_req_t req, fuse_ino_t ino, const char *in_name, } ret = fgetxattr(fd, name, value, size); } else { - sprintf(procname, "%i", inode->fd); + ret = lo_inode_fd(inode, &inode_fd); + if (ret < 0) { + saverr = -ret; + goto out; + } + sprintf(procname, "%i", inode_fd.fd); /* fchdir should not fail here */ FCHDIR_NOFAIL(lo->proc_self_fd); ret = getxattr(procname, name, value, size); @@ -2887,6 +2965,7 @@ out: static void lo_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size) { + g_auto(TempFd) inode_fd = TEMP_FD_INIT; struct lo_data *lo = lo_data(req); g_autofree char *value = NULL; char procname[64]; @@ -2924,7 +3003,12 @@ static void lo_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size) } ret = flistxattr(fd, value, size); } else { - sprintf(procname, "%i", inode->fd); + ret = lo_inode_fd(inode, &inode_fd); + if (ret < 0) { + saverr = -ret; + goto out; + } + sprintf(procname, "%i", inode_fd.fd); /* fchdir should not fail here */ FCHDIR_NOFAIL(lo->proc_self_fd); ret = listxattr(procname, value, size); @@ -3013,6 +3097,7 @@ out: static void lo_setxattr(fuse_req_t req, fuse_ino_t ino, const char *in_name, const char *value, size_t size, int flags) { + g_auto(TempFd) inode_fd = TEMP_FD_INIT; char procname[64]; const char *name; char *mapped_name; @@ -3058,7 +3143,12 @@ static void lo_setxattr(fuse_req_t req, fuse_ino_t ino, const char *in_name, } ret = fsetxattr(fd, name, value, size, flags); } else { - sprintf(procname, "%i", inode->fd); + ret = lo_inode_fd(inode, &inode_fd); + if (ret < 0) { + saverr = -ret; + goto out; + } + sprintf(procname, "%i", inode_fd.fd); /* fchdir should not fail here */ FCHDIR_NOFAIL(lo->proc_self_fd); ret = setxattr(procname, name, value, size, flags); @@ -3079,6 +3169,7 @@ out: static void lo_removexattr(fuse_req_t req, fuse_ino_t ino, const char *in_name) { + g_auto(TempFd) inode_fd = TEMP_FD_INIT; char procname[64]; const char *name; char *mapped_name; @@ -3124,7 +3215,12 @@ static void lo_removexattr(fuse_req_t req, fuse_ino_t ino, const char *in_name) } ret = fremovexattr(fd, name); } else { - sprintf(procname, "%i", inode->fd); + ret = lo_inode_fd(inode, &inode_fd); + if (ret < 0) { + saverr = -ret; + goto out; + } + sprintf(procname, "%i", inode_fd.fd); /* fchdir should not fail here */ FCHDIR_NOFAIL(lo->proc_self_fd); ret = removexattr(procname, name); -- 2.31.1