138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
#include "fs.h"
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#include <assert.h>
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#include <minix/dmap.h>
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#include <minix/endpoint.h>
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#include <minix/vfsif.h>
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#include "buf.h"
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#include "inode.h"
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#include "drivers.h"
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FORWARD _PROTOTYPE(void init_server, (void) );
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FORWARD _PROTOTYPE(void get_work, (message *m_in) );
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/*===========================================================================*
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* main *
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*===========================================================================*/
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PUBLIC int main(int argc, char *argv[])
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{
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/* This is the main routine of this service. The main loop consists of
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* three major activities: getting new work, processing the work, and
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* sending the reply. The loop never terminates, unless a panic occurs.
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*/
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int error, ind;
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message m;
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/* Initialize the server, then go to work. */
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init_server();
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while(!exitsignaled || busy) {
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endpoint_t src;
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/* Wait for request message. */
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get_work(&fs_m_in);
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src = fs_m_in.m_source;
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error = OK;
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caller_uid = -1; /* To trap errors */
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caller_gid = -1;
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if (src == PM_PROC_NR) continue; /* Exit signal */
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assert(src == VFS_PROC_NR); /* Otherwise this must be VFS talking */
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req_nr = fs_m_in.m_type;
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if (req_nr < VFS_BASE) {
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fs_m_in.m_type += VFS_BASE;
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req_nr = fs_m_in.m_type;
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}
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ind = req_nr - VFS_BASE;
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if (ind < 0 || ind >= NREQS) {
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printf("pfs: bad request %d\n", req_nr);
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printf("ind = %d\n", ind);
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error = EINVAL;
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} else {
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error = (*fs_call_vec[ind])();
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}
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fs_m_out.m_type = error;
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reply(src, &fs_m_out);
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}
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return(OK);
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}
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/*===========================================================================*
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* init_server *
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*===========================================================================*/
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PRIVATE void init_server(void)
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{
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int i;
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/* Initialize main loop parameters. */
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exitsignaled = 0; /* No exit request seen yet. */
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busy = 0; /* Server is not 'busy' (i.e., inodes in use). */
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/* Init inode table */
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for (i = 0; i < NR_INODES; ++i) {
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inode[i].i_count = 0;
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cch[i] = 0;
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}
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init_inode_cache();
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/* Init driver mapping */
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for (i = 0; i < NR_DEVICES; ++i)
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driver_endpoints[i].driver_e = NONE;
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SELF_E = getprocnr();
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buf_pool();
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}
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/*===========================================================================*
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* get_work *
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*===========================================================================*/
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PRIVATE void get_work(m_in)
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message *m_in; /* pointer to message */
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{
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int r, srcok = 0;
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endpoint_t src;
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do {
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if ((r = receive(ANY, m_in)) != OK) /* wait for message */
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panic("PFS","receive failed", r);
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src = fs_m_in.m_source;
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if (src != VFS_PROC_NR) {
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if(src == PM_PROC_NR) {
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if(is_notify(fs_m_in.m_type)) {
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exitsignaled = 1; /* Normal exit request. */
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srcok = 1;
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} else
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printf("PFS: unexpected message from PM\n");
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} else
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printf("PFS: unexpected source %d\n", src);
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} else if(src == VFS_PROC_NR) {
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srcok = 1; /* Normal FS request. */
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} else
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printf("PFS: unexpected source %d\n", src);
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} while(!srcok);
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assert( src == VFS_PROC_NR ||
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(src == PM_PROC_NR && is_notify(fs_m_in.m_type))
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);
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}
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/*===========================================================================*
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* reply *
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*===========================================================================*/
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PUBLIC void reply(who, m_out)
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int who;
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message *m_out; /* report result */
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{
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if (OK != send(who, m_out)) /* send the message */
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printf("PFS(%d) was unable to send reply\n", SELF_E);
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}
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