diff options
Diffstat (limited to 'tools/virtiofsd/passthrough_ll.c')
| -rw-r--r-- | tools/virtiofsd/passthrough_ll.c | 175 |
1 files changed, 6 insertions, 169 deletions
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c index 3ba1d90984..2ce7c96085 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -140,7 +140,6 @@ enum { struct lo_data { pthread_mutex_t mutex; int debug; - int norace; int writeback; int flock; int posix_lock; @@ -176,7 +175,6 @@ static const struct fuse_opt lo_opts[] = { { "cache=none", offsetof(struct lo_data, cache), CACHE_NONE }, { "cache=auto", offsetof(struct lo_data, cache), CACHE_AUTO }, { "cache=always", offsetof(struct lo_data, cache), CACHE_ALWAYS }, - { "norace", offsetof(struct lo_data, norace), 1 }, { "readdirplus", offsetof(struct lo_data, readdirplus_set), 1 }, { "no_readdirplus", offsetof(struct lo_data, readdirplus_clear), 1 }, FUSE_OPT_END @@ -592,136 +590,6 @@ static void lo_getattr(fuse_req_t req, fuse_ino_t ino, fuse_reply_attr(req, &buf, lo->timeout); } -/* - * Increments parent->nlookup and caller must release refcount using - * lo_inode_put(&parent). - */ -static int lo_parent_and_name(struct lo_data *lo, struct lo_inode *inode, - char path[PATH_MAX], struct lo_inode **parent) -{ - char procname[64]; - char *last; - struct stat stat; - struct lo_inode *p; - int retries = 2; - int res; - -retry: - sprintf(procname, "%i", inode->fd); - - res = readlinkat(lo->proc_self_fd, procname, path, PATH_MAX); - if (res < 0) { - fuse_log(FUSE_LOG_WARNING, "%s: readlink failed: %m\n", __func__); - goto fail_noretry; - } - - if (res >= PATH_MAX) { - fuse_log(FUSE_LOG_WARNING, "%s: readlink overflowed\n", __func__); - goto fail_noretry; - } - path[res] = '\0'; - - last = strrchr(path, '/'); - if (last == NULL) { - /* Shouldn't happen */ - fuse_log( - FUSE_LOG_WARNING, - "%s: INTERNAL ERROR: bad path read from proc\n", __func__); - goto fail_noretry; - } - if (last == path) { - p = &lo->root; - pthread_mutex_lock(&lo->mutex); - p->nlookup++; - g_atomic_int_inc(&p->refcount); - pthread_mutex_unlock(&lo->mutex); - } else { - *last = '\0'; - res = fstatat(AT_FDCWD, last == path ? "/" : path, &stat, 0); - if (res == -1) { - if (!retries) { - fuse_log(FUSE_LOG_WARNING, - "%s: failed to stat parent: %m\n", __func__); - } - goto fail; - } - p = lo_find(lo, &stat); - if (p == NULL) { - if (!retries) { - fuse_log(FUSE_LOG_WARNING, - "%s: failed to find parent\n", __func__); - } - goto fail; - } - } - last++; - res = fstatat(p->fd, last, &stat, AT_SYMLINK_NOFOLLOW); - if (res == -1) { - if (!retries) { - fuse_log(FUSE_LOG_WARNING, - "%s: failed to stat last\n", __func__); - } - goto fail_unref; - } - if (stat.st_dev != inode->key.dev || stat.st_ino != inode->key.ino) { - if (!retries) { - fuse_log(FUSE_LOG_WARNING, - "%s: failed to match last\n", __func__); - } - goto fail_unref; - } - *parent = p; - memmove(path, last, strlen(last) + 1); - - return 0; - -fail_unref: - unref_inode_lolocked(lo, p, 1); - lo_inode_put(lo, &p); -fail: - if (retries) { - retries--; - goto retry; - } -fail_noretry: - errno = EIO; - return -1; -} - -static int utimensat_empty(struct lo_data *lo, struct lo_inode *inode, - const struct timespec *tv) -{ - int res; - struct lo_inode *parent; - char path[PATH_MAX]; - - if (S_ISLNK(inode->filetype)) { - res = utimensat(inode->fd, "", tv, AT_EMPTY_PATH); - if (res == -1 && errno == EINVAL) { - /* Sorry, no race free way to set times on symlink. */ - if (lo->norace) { - errno = EPERM; - } else { - goto fallback; - } - } - return res; - } - sprintf(path, "%i", inode->fd); - - return utimensat(lo->proc_self_fd, path, tv, 0); - -fallback: - res = lo_parent_and_name(lo, inode, path, &parent); - if (res != -1) { - res = utimensat(parent->fd, path, tv, AT_SYMLINK_NOFOLLOW); - unref_inode_lolocked(lo, parent, 1); - lo_inode_put(lo, &parent); - } - - return res; -} - static int lo_fi_fd(fuse_req_t req, struct fuse_file_info *fi) { struct lo_data *lo = lo_data(req); @@ -828,7 +696,8 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr, if (fi) { res = futimens(fd, tv); } else { - res = utimensat_empty(lo, inode, tv); + sprintf(procname, "%i", inode->fd); + res = utimensat(lo->proc_self_fd, procname, tv, 0); } if (res == -1) { goto out_err; @@ -1129,41 +998,6 @@ static void lo_symlink(fuse_req_t req, const char *link, fuse_ino_t parent, lo_mknod_symlink(req, parent, name, S_IFLNK, 0, link); } -static int linkat_empty_nofollow(struct lo_data *lo, struct lo_inode *inode, - int dfd, const char *name) -{ - int res; - struct lo_inode *parent; - char path[PATH_MAX]; - - if (S_ISLNK(inode->filetype)) { - res = linkat(inode->fd, "", dfd, name, AT_EMPTY_PATH); - if (res == -1 && (errno == ENOENT || errno == EINVAL)) { - /* Sorry, no race free way to hard-link a symlink. */ - if (lo->norace) { - errno = EPERM; - } else { - goto fallback; - } - } - return res; - } - - sprintf(path, "%i", inode->fd); - - return linkat(lo->proc_self_fd, path, dfd, name, AT_SYMLINK_FOLLOW); - -fallback: - res = lo_parent_and_name(lo, inode, path, &parent); - if (res != -1) { - res = linkat(parent->fd, path, dfd, name, 0); - unref_inode_lolocked(lo, parent, 1); - lo_inode_put(lo, &parent); - } - - return res; -} - static void lo_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t parent, const char *name) { @@ -1172,6 +1006,7 @@ static void lo_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t parent, struct lo_inode *parent_inode; struct lo_inode *inode; struct fuse_entry_param e; + char procname[64]; int saverr; if (!is_safe_path_component(name)) { @@ -1190,7 +1025,9 @@ static void lo_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t parent, e.attr_timeout = lo->timeout; e.entry_timeout = lo->timeout; - res = linkat_empty_nofollow(lo, inode, parent_inode->fd, name); + sprintf(procname, "%i", inode->fd); + res = linkat(lo->proc_self_fd, procname, parent_inode->fd, name, + AT_SYMLINK_FOLLOW); if (res == -1) { goto out_err; } |