213 lines
5.7 KiB
C
213 lines
5.7 KiB
C
#include "fs.h"
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#include <assert.h>
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#include <minix/callnr.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.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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/* Declare some local functions. */
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FORWARD _PROTOTYPE(void get_work, (message *m_in) );
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FORWARD _PROTOTYPE( void reply, (endpoint_t who, message *m_out) );
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/* SEF functions and variables. */
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FORWARD _PROTOTYPE( void sef_local_startup, (void) );
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FORWARD _PROTOTYPE( int sef_cb_init_fresh, (int type, sef_init_info_t *info) );
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FORWARD _PROTOTYPE( void sef_cb_signal_handler, (int signo) );
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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 = OK, ind, transid;
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/* SEF local startup. */
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env_setargs(argc, argv);
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sef_local_startup();
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while(!unmountdone || !exitsignaled) {
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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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transid = TRNS_GET_ID(fs_m_in.m_type);
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fs_m_in.m_type = TRNS_DEL_ID(fs_m_in.m_type);
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if (fs_m_in.m_type == 0) {
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assert(!IS_VFS_FS_TRANSID(transid));
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fs_m_in.m_type = transid; /* Backwards compat. */
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transid = 0;
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} else
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assert(IS_VFS_FS_TRANSID(transid));
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src = fs_m_in.m_source;
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caller_uid = INVAL_UID; /* To trap errors */
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caller_gid = INVAL_GID;
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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("MFS: bad request %d from %d\n", req_nr, src);
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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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/*cch_check();*/
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}
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fs_m_out.m_type = error;
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if (IS_VFS_FS_TRANSID(transid)) {
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/* If a transaction ID was set, reset it */
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fs_m_out.m_type = TRNS_ADD_ID(fs_m_out.m_type, transid);
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}
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reply(src, &fs_m_out);
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if (error == OK)
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read_ahead(); /* do block read ahead */
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}
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}
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/*===========================================================================*
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* sef_local_startup *
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*===========================================================================*/
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PRIVATE void sef_local_startup()
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{
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/* Register init callbacks. */
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sef_setcb_init_fresh(sef_cb_init_fresh);
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sef_setcb_init_restart(sef_cb_init_fail);
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/* No live update support for now. */
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/* Register signal callbacks. */
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sef_setcb_signal_handler(sef_cb_signal_handler);
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/* Let SEF perform startup. */
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sef_startup();
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}
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/*===========================================================================*
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* sef_cb_init_fresh *
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*===========================================================================*/
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PRIVATE int sef_cb_init_fresh(int type, sef_init_info_t *info)
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{
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/* Initialize the Minix file server. */
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int i;
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may_use_vmcache = 1;
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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(DEFAULT_NR_BUFS);
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fs_block_size = _MIN_BLOCK_SIZE;
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return(OK);
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}
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/*===========================================================================*
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* sef_cb_signal_handler *
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*===========================================================================*/
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PRIVATE void sef_cb_signal_handler(int signo)
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{
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/* Only check for termination signal, ignore anything else. */
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if (signo != SIGTERM) return;
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exitsignaled = 1;
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(void) fs_sync();
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/* If unmounting has already been performed, exit immediately.
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* We might not get another message.
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*/
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if (unmountdone) exit(0);
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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 = sef_receive(ANY, m_in)) != OK) /* wait for message */
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panic("sef_receive failed: %d", r);
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src = m_in->m_source;
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if(src == VFS_PROC_NR) {
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if(unmountdone)
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printf("MFS: unmounted: unexpected message from FS\n");
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else
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srcok = 1; /* Normal FS request. */
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} else
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printf("MFS: unexpected source %d\n", src);
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} while(!srcok);
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assert((src == VFS_PROC_NR && !unmountdone));
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}
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/*===========================================================================*
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* reply *
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*===========================================================================*/
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PRIVATE void reply(
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endpoint_t who,
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message *m_out /* report result */
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)
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{
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if (OK != send(who, m_out)) /* send the message */
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printf("MFS(%d) was unable to send reply\n", SELF_E);
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}
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#if 0
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/*===========================================================================*
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* cch_check *
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*===========================================================================*/
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PRIVATE void cch_check(void)
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{
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int i;
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for (i = 0; i < NR_INODES; ++i) {
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if (inode[i].i_count != cch[i] && req_nr != REQ_GETNODE &&
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req_nr != REQ_PUTNODE && req_nr != REQ_READSUPER &&
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req_nr != REQ_MOUNTPOINT && req_nr != REQ_UNMOUNT &&
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req_nr != REQ_SYNC && req_nr != REQ_LOOKUP) {
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printf("MFS(%d) inode(%lu) cc: %d req_nr: %d\n", SELF_E,
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inode[i].i_num, inode[i].i_count - cch[i], req_nr);
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}
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cch[i] = inode[i].i_count;
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}
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}
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#endif
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