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https://github.com/drasko/codezero.git
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107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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* FS0. Filesystem implementation
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#include <stdio.h>
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#include <string.h>
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#include <l4lib/arch/syscalls.h>
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#include <l4lib/arch/syslib.h>
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#include <l4lib/kip.h>
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#include <l4lib/utcb.h>
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#include <l4lib/ipcdefs.h>
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#include <fs.h>
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#include <init.h>
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#include <kdata.h>
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#include <syscalls.h>
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#include <task.h>
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/*
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* TODO:
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* - Have a dentry cache searchable by name
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* - Have a vnode cache searchable by vnum (and name?)
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* - fs-specific readdir would read contents by page range, and add vnodes/dentries
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* to their caches, while populating the directory vnode being read.
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* - Have 2 vfs_lookup() flavors, one that searches a path, one that searches a vnum.
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* - dirbuf is either allocated by low-level readdir, or else by a higher level, i.e.
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* either high-level vfs code, or the mm0 page cache.
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* - readdir provides a posix-compliant dirent structure list in dirbuf.
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* - memfs dentries should be identical to posix struct dirents.
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*
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* ALL DONE!!! But untested.
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*
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* - Add mkdir
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* - Add create
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* - Add read/write -> This will need page cache and mm0 involvement.
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*/
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/* TODO:
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* Assign memfs dentry fields same as in posix
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*/
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/* Synchronise with pager via a `wait' tagged ipc with destination as pager */
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void wait_pager(l4id_t partner)
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{
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l4_send(partner, L4_IPC_TAG_WAIT);
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printf("%s: Pager synced with us.\n", __TASKNAME__);
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}
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void handle_fs_requests(void)
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{
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u32 mr[MR_UNUSED_TOTAL];
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l4id_t sender;
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int err;
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u32 tag;
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printf("%s: Listening requests.\n", __TASKNAME__);
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if ((err = l4_receive(L4_ANYTHREAD)) < 0) {
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printf("%s: %s: IPC Error: %d. Quitting...\n", __TASKNAME__,
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__FUNCTION__, err);
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BUG();
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}
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/* Read conventional ipc data */
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tag = l4_get_tag();
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sender = l4_get_sender();
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/* Read mrs not used by syslib */
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for (int i = 0; i < MR_UNUSED_TOTAL; i++)
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mr[i] = read_mr(i);
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switch(tag) {
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case L4_IPC_TAG_WAIT:
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printf("%s: Synced with waiting thread.\n", __TASKNAME__);
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break;
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case L4_IPC_TAG_OPEN:
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sys_open(sender, (void *)mr[0], (int)mr[1], (u32)mr[2]);
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break;
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case L4_IPC_TAG_READ:
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sys_read(sender, (int)mr[0], (void *)mr[1], (int)mr[2]);
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break;
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case L4_IPC_TAG_WRITE:
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sys_write(sender, (int)mr[0], (void *)mr[1], (int)mr[2]);
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break;
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case L4_IPC_TAG_LSEEK:
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sys_lseek(sender, (int)mr[0], (int)mr[1], (int)mr[2]);
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break;
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default:
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printf("%s: Unrecognised ipc tag (%d)"
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"received. Ignoring.\n", __TASKNAME__, mr[MR_TAG]);
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}
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}
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void main(void)
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{
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printf("\n%s: Started with tid: %d\n", __TASKNAME__, self_tid());
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initialise();
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wait_pager(PAGER_TID);
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while (1) {
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handle_fs_requests();
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}
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}
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