From 1252bdeaf795629ac34161bc59a263e998483247 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Mon, 8 Aug 2022 01:00:48 +0200
Subject: user: separate tmpfs into its own executable, add `mount`
---
src/user/app/init/driver/tmpfs.c | 132 ---------------------------------------
1 file changed, 132 deletions(-)
delete mode 100644 src/user/app/init/driver/tmpfs.c
(limited to 'src/user/app/init/driver/tmpfs.c')
diff --git a/src/user/app/init/driver/tmpfs.c b/src/user/app/init/driver/tmpfs.c
deleted file mode 100644
index c7abf50..0000000
--- a/src/user/app/init/driver/tmpfs.c
+++ /dev/null
@@ -1,132 +0,0 @@
-#include <camellia/fsutil.h>
-#include <camellia/syscalls.h>
-#include <shared/mem.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <user/lib/fs/dir.h>
-
-struct node {
- const char *name;
- size_t namelen;
- struct node *next;
- char *buf;
- size_t size, capacity;
-};
-
-struct node *root = NULL;
-static struct node special_root = {
- .size = 0,
-};
-
-static struct node *lookup(const char *path, size_t len) {
- for (struct node *iter = root; iter; iter = iter->next) {
- if (iter->namelen == len && !memcmp(path, iter->name, len))
- return iter;
- }
- return NULL;
-}
-
-static struct node *tmpfs_open(const char *path, struct fs_wait_response *res) {
- struct node *node;
- if (res->len == 0) return NULL;
- path++;
- res->len--;
-
- if (res->len == 0) return &special_root;
-
- // no directory support (yet)
- if (memchr(path, '/', res->len)) return NULL;
-
- node = lookup(path, res->len);
- if (!node && (res->flags & OPEN_CREATE)) {
- node = malloc(sizeof *node);
- memset(node, 0, sizeof *node);
-
- char *namebuf = malloc(res->len + 1);
- memcpy(namebuf, path, res->len);
- namebuf[res->len] = '\0';
- node->name = namebuf;
- node->namelen = res->len;
- node->next = root;
- root = node;
- }
- return node;
-}
-
-void tmpfs_drv(void) {
- const size_t buflen = 4096;
- char *buf = malloc(buflen);
- struct fs_wait_response res;
- struct node *ptr;
- while (!_syscall_fs_wait(buf, buflen, &res)) {
- switch (res.op) {
- case VFSOP_OPEN:
- ptr = tmpfs_open(buf, &res);
- _syscall_fs_respond(ptr, ptr ? 0 : -1, 0);
- break;
-
- case VFSOP_READ:
- ptr = (void*)res.id;
- if (ptr == &special_root) {
- struct dirbuild db;
- dir_start(&db, res.offset, buf, buflen);
- for (struct node *iter = root; iter; iter = iter->next)
- dir_append(&db, iter->name);
- _syscall_fs_respond(buf, dir_finish(&db), 0);
- } else {
- fs_normslice(&res.offset, &res.len, ptr->size, false);
- _syscall_fs_respond(ptr->buf + res.offset, res.len, 0);
- break;
- }
- break;
-
- case VFSOP_WRITE:
- ptr = (void*)res.id;
- if (ptr == &special_root) {
- _syscall_fs_respond(NULL, -1, 0);
- break;
- }
- if (res.len > 0 && !ptr->buf) {
- ptr->buf = malloc(256);
- if (!ptr->buf) {
- _syscall_fs_respond(NULL, -1, 0);
- break;
- }
- memset(ptr->buf, 0, 256);
- ptr->capacity = 256;
- }
-
- fs_normslice(&res.offset, &res.len, ptr->size, true);
- if (ptr->capacity <= res.offset + res.len) {
- size_t newcap = 1;
- while (newcap && newcap <= res.offset + res.len)
- newcap *= 2;
- if (!newcap) { /* overflow */
- _syscall_fs_respond(NULL, -1, 0);
- break;
- }
- ptr->capacity = newcap;
- ptr->buf = realloc(ptr->buf, ptr->capacity);
- }
-
- memcpy(ptr->buf + res.offset, buf, res.len);
- if ((res.flags & WRITE_TRUNCATE) || ptr->size < res.offset + res.len) {
- ptr->size = res.offset + res.len;
- }
- _syscall_fs_respond(NULL, res.len, 0);
- break;
-
- case VFSOP_GETSIZE:
- ptr = (void*)res.id;
- _syscall_fs_respond(NULL, ptr->size, 0);
- break;
-
- default:
- _syscall_fs_respond(NULL, -1, 0);
- break;
- }
- }
-
- exit(1);
-}
--
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