servers/ext2/main.c

   1 #include "fs.h"
   2 #include <assert.h>
   3 #include <minix/callnr.h>
   4 #include <signal.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8 #include <minix/dmap.h>
   9 #include <minix/endpoint.h>
  10 #include <minix/vfsif.h>
  11 #include <minix/optset.h>
  12 #include "buf.h"
  13 #include "inode.h"
  14
  15 /* Declare some local functions. */
  16 static void get_work(message *m_in);
  17 static void reply(endpoint_t who, message *m_out);
  18
  19 /* SEF functions and variables. */
  20 static void sef_local_startup(void);
  21 static int sef_cb_init_fresh(int type, sef_init_info_t *info);
  22 static void sef_cb_signal_handler(int signo);
  23
  24 EXTERN int env_argc;
  25 EXTERN char **env_argv;
  26
  27 static struct optset optset_table[] = {
  28   { "sb",               OPT_INT,    &opt.block_with_super,      0       },
  29   { "orlov",            OPT_BOOL,   &opt.use_orlov,             TRUE    },
  30   { "oldalloc",         OPT_BOOL,   &opt.use_orlov,             FALSE   },
  31   { "mfsalloc",         OPT_BOOL,   &opt.mfsalloc,              TRUE    },
  32   { "reserved",         OPT_BOOL,   &opt.use_reserved_blocks,   TRUE    },
  33   { "prealloc",         OPT_BOOL,   &opt.use_prealloc,          TRUE    },
  34   { "noprealloc",       OPT_BOOL,   &opt.use_prealloc,          FALSE   },
  35   { NULL,               0,          NULL,                       0                                                               }
  36 };
  37
  38 /*===========================================================================*
  39  *                              main                                         *
  40  *===========================================================================*/
  41 int main(int argc, char *argv[])
  42 {
  43 /* This is the main routine of this service. The main loop consists of
  44  * three major activities: getting new work, processing the work, and
  45  * sending the reply. The loop never terminates, unless a panic occurs.
  46  */
  47   int error = OK, ind, transid;
  48   unsigned short test_endian = 1;
  49
  50   /* SEF local startup. */
  51   env_setargs(argc, argv);
  52   sef_local_startup();
  53
  54   le_CPU = (*(unsigned char *) &test_endian == 0 ? 0 : 1);
  55
  56   /* Server isn't tested on big endian CPU */
  57   ASSERT(le_CPU == 1);
  58
  59   while(!unmountdone || !exitsignaled) {
  60         endpoint_t src;
  61
  62         /* Wait for request message. */
  63         get_work(&fs_m_in);
  64
  65         transid = TRNS_GET_ID(fs_m_in.m_type);
  66         fs_m_in.m_type = TRNS_DEL_ID(fs_m_in.m_type);
  67         if (fs_m_in.m_type == 0) {
  68                 assert(!IS_VFS_FS_TRANSID(transid));
  69                 fs_m_in.m_type = transid;       /* Backwards compat. */
  70                 transid = 0;
  71         } else
  72                 assert(IS_VFS_FS_TRANSID(transid));
  73
  74         src = fs_m_in.m_source;
  75         caller_uid = INVAL_UID; /* To trap errors */
  76         caller_gid = INVAL_GID;
  77         req_nr = fs_m_in.m_type;
  78
  79         if (req_nr < VFS_BASE) {
  80                 fs_m_in.m_type += VFS_BASE;
  81                 req_nr = fs_m_in.m_type;
  82         }
  83         ind = req_nr - VFS_BASE;
  84
  85         if (ind < 0 || ind >= NREQS) {
  86                 printf("mfs: bad request %d\n", req_nr);
  87                 printf("ind = %d\n", ind);
  88                 error = EINVAL;
  89         } else {
  90                 error = (*fs_call_vec[ind])();
  91         }
  92
  93         fs_m_out.m_type = error;
  94         if (IS_VFS_FS_TRANSID(transid)) {
  95                 /* If a transaction ID was set, reset it */
  96                 fs_m_out.m_type = TRNS_ADD_ID(fs_m_out.m_type, transid);
  97         }
  98         reply(src, &fs_m_out);
  99
 100         if (error == OK)
 101                 read_ahead(); /* do block read ahead */
 102   }
 103
 104   return 0;
 105 }
 106
 107 /*===========================================================================*
 108  *                             sef_local_startup                             *
 109  *===========================================================================*/
 110 static void sef_local_startup()
 111 {
 112   /* Register init callbacks. */
 113   sef_setcb_init_fresh(sef_cb_init_fresh);
 114   sef_setcb_init_restart(sef_cb_init_fail);
 115
 116   /* No live update support for now. */
 117
 118   /* Register signal callbacks. */
 119   sef_setcb_signal_handler(sef_cb_signal_handler);
 120
 121   /* Let SEF perform startup. */
 122   sef_startup();
 123 }
 124
 125 /*===========================================================================*
 126  *                          sef_cb_init_fresh                                *
 127  *===========================================================================*/
 128 static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
 129 {
 130 /* Initialize the Minix file server. */
 131   int i;
 132
 133   /* Defaults */
 134   opt.use_orlov = TRUE;
 135   opt.mfsalloc = FALSE;
 136   opt.use_reserved_blocks = FALSE;
 137   opt.block_with_super = 0;
 138   opt.use_prealloc = FALSE;
 139
 140   /* If we have been given an options string, parse options from there. */
 141   for (i = 1; i < env_argc - 1; i++)
 142         if (!strcmp(env_argv[i], "-o"))
 143                 optset_parse(optset_table, env_argv[++i]);
 144
 145   lmfs_may_use_vmcache(1);
 146
 147   /* Init inode table */
 148   for (i = 0; i < NR_INODES; ++i) {
 149         inode[i].i_count = 0;
 150         cch[i] = 0;
 151   }
 152
 153   init_inode_cache();
 154
 155   SELF_E = getprocnr();
 156
 157   /* just a small number before we find out the block size at mount time */
 158   lmfs_buf_pool(10);
 159
 160   return(OK);
 161 }
 162
 163 /*===========================================================================*
 164  *                         sef_cb_signal_handler                             *
 165  *===========================================================================*/
 166 static void sef_cb_signal_handler(int signo)
 167 {
 168   /* Only check for termination signal, ignore anything else. */
 169   if (signo != SIGTERM) return;
 170
 171   exitsignaled = 1;
 172   (void) fs_sync();
 173
 174   /* If unmounting has already been performed, exit immediately.
 175    * We might not get another message.
 176    */
 177   if (unmountdone) exit(0);
 178 }
 179
 180 /*===========================================================================*
 181  *                              get_work                                     *
 182  *===========================================================================*/
 183 static void get_work(m_in)
 184 message *m_in;                          /* pointer to message */
 185 {
 186   int r, srcok = 0;
 187   endpoint_t src;
 188
 189   do {
 190         if ((r = sef_receive(ANY, m_in)) != OK)         /* wait for message */
 191                 panic("sef_receive failed: %d", r);
 192         src = m_in->m_source;
 193
 194         if(src == VFS_PROC_NR) {
 195                 if(unmountdone)
 196                         printf("ext2: unmounted: unexpected message from FS\n");
 197                 else
 198                         srcok = 1;              /* Normal FS request. */
 199
 200         } else
 201                 printf("ext2: unexpected source %d\n", src);
 202   } while(!srcok);
 203
 204    assert((src == VFS_PROC_NR && !unmountdone));
 205 }
 206
 207
 208 /*===========================================================================*
 209  *                              reply                                        *
 210  *===========================================================================*/
 211 static void reply(
 212   endpoint_t who,
 213   message *m_out                        /* report result */
 214 )
 215 {
 216   if (OK != send(who, m_out))    /* send the message */
 217         printf("ext2(%d) was unable to send reply\n", SELF_E);
 218 }