static int sysfs_readdir(struct file *file, struct dir_context *ctx) { struct dentry *dentry = file->f_path.dentry; struct sysfs_dirent *parent_sd = dentry->d_fsdata; struct sysfs_dirent *pos = file->private_data; enum kobj_ns_type type; const void *ns; type = sysfs_ns_type(parent_sd); ns = sysfs_info(dentry->d_sb)->ns[type]; if (!dir_emit_dots(file, ctx)) return 0; mutex_lock(&sysfs_mutex); for (pos = sysfs_dir_pos(ns, parent_sd, ctx->pos, pos); pos; pos = sysfs_dir_next_pos(ns, parent_sd, ctx->pos, pos)) { const char *name = pos->s_name; unsigned int type = dt_type(pos); int len = strlen(name); ino_t ino = pos->s_ino; ctx->pos = pos->s_hash; file->private_data = sysfs_get(pos); mutex_unlock(&sysfs_mutex); if (!dir_emit(ctx, name, len, ino, type)) return 0; mutex_lock(&sysfs_mutex); } mutex_unlock(&sysfs_mutex); file->private_data = NULL; ctx->pos = INT_MAX; return 0; }
static struct sysfs_dirent *sysfs_dir_next_pos(struct sysfs_dirent *parent_sd, ino_t ino, struct sysfs_dirent *pos) { pos = sysfs_dir_pos(parent_sd, ino, pos); if (pos) pos = pos->s_sibling; return pos; }
static struct sysfs_dirent *sysfs_dir_next_pos(const void *ns, struct sysfs_dirent *parent_sd, ino_t ino, struct sysfs_dirent *pos) { pos = sysfs_dir_pos(ns, parent_sd, ino, pos); if (pos) do { struct rb_node *node = rb_next(&pos->s_rb); if (!node) pos = NULL; else pos = to_sysfs_dirent(node); } while (pos && pos->s_ns != ns); return pos; }
static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) { struct dentry *dentry = filp->f_path.dentry; struct sysfs_dirent * parent_sd = dentry->d_fsdata; struct sysfs_dirent *pos = filp->private_data; ino_t ino; if (filp->f_pos == 0) { ino = parent_sd->s_ino; if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0) filp->f_pos++; } if (filp->f_pos == 1) { if (parent_sd->s_parent) ino = parent_sd->s_parent->s_ino; else ino = parent_sd->s_ino; if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0) filp->f_pos++; } mutex_lock(&sysfs_mutex); for (pos = sysfs_dir_pos(parent_sd, filp->f_pos, pos); pos; pos = sysfs_dir_next_pos(parent_sd, filp->f_pos, pos)) { const char * name; unsigned int type; int len, ret; name = pos->s_name; len = strlen(name); ino = pos->s_ino; type = dt_type(pos); filp->f_pos = ino; filp->private_data = sysfs_get(pos); mutex_unlock(&sysfs_mutex); ret = filldir(dirent, name, len, filp->f_pos, ino, type); mutex_lock(&sysfs_mutex); if (ret < 0) break; } mutex_unlock(&sysfs_mutex); if ((filp->f_pos > 1) && !pos) { /* EOF */ filp->f_pos = INT_MAX; filp->private_data = NULL; } return 0; }