minix/servers/ext2/main.c
Thomas Veerman 6c597561bc EXT2: various fixes
.enable all compile time warnings and make them errors
.refactor functions with unused parameters
.fix null pointer dereference before checking for null
.proper variable initialization
.use safe string copy functions
.fix massive memory corruption bug in fs_getdents
2012-07-30 09:44:58 +00:00

219 lines
6 KiB
C

#include "fs.h"
#include <assert.h>
#include <minix/callnr.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <minix/dmap.h>
#include <minix/endpoint.h>
#include <minix/vfsif.h>
#include <minix/optset.h>
#include "buf.h"
#include "inode.h"
/* Declare some local functions. */
static void get_work(message *m_in);
static void reply(endpoint_t who, message *m_out);
/* SEF functions and variables. */
static void sef_local_startup(void);
static int sef_cb_init_fresh(int type, sef_init_info_t *info);
static void sef_cb_signal_handler(int signo);
EXTERN int env_argc;
EXTERN char **env_argv;
static struct optset optset_table[] = {
{ "sb", OPT_INT, &opt.block_with_super, 0 },
{ "orlov", OPT_BOOL, &opt.use_orlov, TRUE },
{ "oldalloc", OPT_BOOL, &opt.use_orlov, FALSE },
{ "mfsalloc", OPT_BOOL, &opt.mfsalloc, TRUE },
{ "reserved", OPT_BOOL, &opt.use_reserved_blocks, TRUE },
{ "prealloc", OPT_BOOL, &opt.use_prealloc, TRUE },
{ "noprealloc", OPT_BOOL, &opt.use_prealloc, FALSE },
{ NULL, 0, NULL, 0 }
};
/*===========================================================================*
* main *
*===========================================================================*/
int main(int argc, char *argv[])
{
/* This is the main routine of this service. The main loop consists of
* three major activities: getting new work, processing the work, and
* sending the reply. The loop never terminates, unless a panic occurs.
*/
int error = OK, ind, transid;
unsigned short test_endian = 1;
/* SEF local startup. */
env_setargs(argc, argv);
sef_local_startup();
le_CPU = (*(unsigned char *) &test_endian == 0 ? 0 : 1);
/* Server isn't tested on big endian CPU */
ASSERT(le_CPU == 1);
while(!unmountdone || !exitsignaled) {
endpoint_t src;
/* Wait for request message. */
get_work(&fs_m_in);
transid = TRNS_GET_ID(fs_m_in.m_type);
fs_m_in.m_type = TRNS_DEL_ID(fs_m_in.m_type);
if (fs_m_in.m_type == 0) {
assert(!IS_VFS_FS_TRANSID(transid));
fs_m_in.m_type = transid; /* Backwards compat. */
transid = 0;
} else
assert(IS_VFS_FS_TRANSID(transid));
src = fs_m_in.m_source;
caller_uid = INVAL_UID; /* To trap errors */
caller_gid = INVAL_GID;
req_nr = fs_m_in.m_type;
if (req_nr < VFS_BASE) {
fs_m_in.m_type += VFS_BASE;
req_nr = fs_m_in.m_type;
}
ind = req_nr - VFS_BASE;
if (ind < 0 || ind >= NREQS) {
printf("mfs: bad request %d\n", req_nr);
printf("ind = %d\n", ind);
error = EINVAL;
} else {
error = (*fs_call_vec[ind])();
}
fs_m_out.m_type = error;
if (IS_VFS_FS_TRANSID(transid)) {
/* If a transaction ID was set, reset it */
fs_m_out.m_type = TRNS_ADD_ID(fs_m_out.m_type, transid);
}
reply(src, &fs_m_out);
if (error == OK)
read_ahead(); /* do block read ahead */
}
return 0;
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
static void sef_local_startup()
{
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fail);
/* No live update support for now. */
/* Register signal callbacks. */
sef_setcb_signal_handler(sef_cb_signal_handler);
/* Let SEF perform startup. */
sef_startup();
}
/*===========================================================================*
* sef_cb_init_fresh *
*===========================================================================*/
static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
{
/* Initialize the Minix file server. */
int i;
/* Defaults */
opt.use_orlov = TRUE;
opt.mfsalloc = FALSE;
opt.use_reserved_blocks = FALSE;
opt.block_with_super = 0;
opt.use_prealloc = FALSE;
/* If we have been given an options string, parse options from there. */
for (i = 1; i < env_argc - 1; i++)
if (!strcmp(env_argv[i], "-o"))
optset_parse(optset_table, env_argv[++i]);
may_use_vmcache = 1;
/* Init inode table */
for (i = 0; i < NR_INODES; ++i) {
inode[i].i_count = 0;
cch[i] = 0;
}
init_inode_cache();
SELF_E = getprocnr();
/* just a small number before we find out the block size at mount time */
buf_pool(10);
fs_block_size = _MIN_BLOCK_SIZE;
return(OK);
}
/*===========================================================================*
* sef_cb_signal_handler *
*===========================================================================*/
static void sef_cb_signal_handler(int signo)
{
/* Only check for termination signal, ignore anything else. */
if (signo != SIGTERM) return;
exitsignaled = 1;
(void) fs_sync();
/* If unmounting has already been performed, exit immediately.
* We might not get another message.
*/
if (unmountdone) exit(0);
}
/*===========================================================================*
* get_work *
*===========================================================================*/
static void get_work(m_in)
message *m_in; /* pointer to message */
{
int r, srcok = 0;
endpoint_t src;
do {
if ((r = sef_receive(ANY, m_in)) != OK) /* wait for message */
panic("sef_receive failed: %d", r);
src = m_in->m_source;
if(src == VFS_PROC_NR) {
if(unmountdone)
printf("ext2: unmounted: unexpected message from FS\n");
else
srcok = 1; /* Normal FS request. */
} else
printf("ext2: unexpected source %d\n", src);
} while(!srcok);
assert((src == VFS_PROC_NR && !unmountdone));
}
/*===========================================================================*
* reply *
*===========================================================================*/
static void reply(
endpoint_t who,
message *m_out /* report result */
)
{
if (OK != send(who, m_out)) /* send the message */
printf("ext2(%d) was unable to send reply\n", SELF_E);
}