LCOV - code coverage report
Current view: top level - misc/kabi/lvm2.git/tools - polldaemon.c (source / functions) Hit Total Coverage
Test: unnamed Lines: 0 146 0.0 %
Date: 2010-04-13 Functions: 0 9 0.0 %
Branches: 0 90 0.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
       3                 :            :  * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
       4                 :            :  *
       5                 :            :  * This file is part of LVM2.
       6                 :            :  *
       7                 :            :  * This copyrighted material is made available to anyone wishing to use,
       8                 :            :  * modify, copy, or redistribute it subject to the terms and conditions
       9                 :            :  * of the GNU Lesser General Public License v.2.1.
      10                 :            :  *
      11                 :            :  * You should have received a copy of the GNU Lesser General Public License
      12                 :            :  * along with this program; if not, write to the Free Software Foundation,
      13                 :            :  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
      14                 :            :  */
      15                 :            : 
      16                 :            : #include "tools.h"
      17                 :            : #include "polldaemon.h"
      18                 :            : #include "lvm2cmdline.h"
      19                 :            : #include <signal.h>
      20                 :            : #include <sys/wait.h>
      21                 :            : 
      22                 :          0 : static void _sigchld_handler(int sig __attribute((unused)))
      23                 :            : {
      24         [ #  # ]:          0 :         while (wait4(-1, NULL, WNOHANG | WUNTRACED, NULL) > 0) ;
      25                 :          0 : }
      26                 :            : 
      27                 :            : /*
      28                 :            :  * returns:
      29                 :            :  * -1 if the fork failed
      30                 :            :  *  0 if the parent
      31                 :            :  *  1 if the child
      32                 :            :  */
      33                 :          0 : static int _become_daemon(struct cmd_context *cmd)
      34                 :            : {
      35                 :            :         pid_t pid;
      36                 :            :         struct sigaction act = {
      37                 :            :                 {_sigchld_handler},
      38                 :            :                 .sa_flags = SA_NOCLDSTOP,
      39                 :          0 :         };
      40                 :            : 
      41                 :          0 :         log_verbose("Forking background process");
      42                 :            : 
      43                 :          0 :         sigaction(SIGCHLD, &act, NULL);
      44                 :            : 
      45         [ #  # ]:          0 :         if ((pid = fork()) == -1) {
      46                 :          0 :                 log_error("fork failed: %s", strerror(errno));
      47                 :          0 :                 return -1;
      48                 :            :         }
      49                 :            : 
      50                 :            :         /* Parent */
      51         [ #  # ]:          0 :         if (pid > 0)
      52                 :          0 :                 return 0;
      53                 :            : 
      54                 :            :         /* Child */
      55         [ #  # ]:          0 :         if (setsid() == -1)
      56                 :          0 :                 log_error("Background process failed to setsid: %s",
      57                 :            :                           strerror(errno));
      58                 :          0 :         init_verbose(VERBOSE_BASE_LEVEL);
      59                 :            : 
      60                 :          0 :         close(STDIN_FILENO);
      61                 :          0 :         close(STDOUT_FILENO);
      62                 :          0 :         close(STDERR_FILENO);
      63                 :            : 
      64                 :          0 :         strncpy(*cmd->argv, "(lvm2)", strlen(*cmd->argv));
      65                 :            : 
      66                 :          0 :         reset_locking();
      67                 :          0 :         lvmcache_init();
      68                 :          0 :         dev_close_all();
      69                 :            : 
      70                 :          0 :         return 1;
      71                 :            : }
      72                 :            : 
      73                 :          0 : progress_t poll_mirror_progress(struct cmd_context *cmd,
      74                 :            :                                 struct logical_volume *lv, const char *name,
      75                 :            :                                 struct daemon_parms *parms)
      76                 :            : {
      77                 :          0 :         float segment_percent = 0.0, overall_percent = 0.0;
      78                 :            :         percent_range_t percent_range, overall_percent_range;
      79                 :          0 :         uint32_t event_nr = 0;
      80                 :            : 
      81 [ #  # ][ #  # ]:          0 :         if (!lv_mirror_percent(cmd, lv, !parms->interval, &segment_percent,
      82                 :            :                                &percent_range, &event_nr) ||
      83                 :          0 :             (percent_range == PERCENT_INVALID)) {
      84                 :          0 :                 log_error("ABORTING: Mirror percentage check failed.");
      85                 :          0 :                 return PROGRESS_CHECK_FAILED;
      86                 :            :         }
      87                 :            : 
      88                 :          0 :         overall_percent = copy_percent(lv, &overall_percent_range);
      89         [ #  # ]:          0 :         if (parms->progress_display)
      90                 :          0 :                 log_print("%s: %s: %.1f%%", name, parms->progress_title,
      91                 :            :                           overall_percent);
      92                 :            :         else
      93                 :          0 :                 log_verbose("%s: %s: %.1f%%", name, parms->progress_title,
      94                 :            :                             overall_percent);
      95                 :            : 
      96         [ #  # ]:          0 :         if (percent_range != PERCENT_100)
      97                 :          0 :                 return PROGRESS_UNFINISHED;
      98                 :            : 
      99         [ #  # ]:          0 :         if (overall_percent_range == PERCENT_100)
     100                 :          0 :                 return PROGRESS_FINISHED_ALL;
     101                 :            : 
     102                 :          0 :         return PROGRESS_FINISHED_SEGMENT;
     103                 :            : }
     104                 :            : 
     105                 :          0 : static int _check_lv_status(struct cmd_context *cmd,
     106                 :            :                             struct volume_group *vg,
     107                 :            :                             struct logical_volume *lv,
     108                 :            :                             const char *name, struct daemon_parms *parms,
     109                 :            :                             int *finished)
     110                 :            : {
     111                 :            :         struct dm_list *lvs_changed;
     112                 :            :         progress_t progress;
     113                 :            : 
     114                 :            :         /* By default, caller should not retry */
     115                 :          0 :         *finished = 1;
     116                 :            : 
     117         [ #  # ]:          0 :         if (parms->aborting) {
     118         [ #  # ]:          0 :                 if (!(lvs_changed = lvs_using_lv(cmd, vg, lv))) {
     119                 :          0 :                         log_error("Failed to generate list of copied LVs: "
     120                 :            :                                   "can't abort.");
     121                 :          0 :                         return 0;
     122                 :            :                 }
     123                 :          0 :                 parms->poll_fns->finish_copy(cmd, vg, lv, lvs_changed);
     124                 :          0 :                 return 0;
     125                 :            :         }
     126                 :            : 
     127                 :          0 :         progress = parms->poll_fns->poll_progress(cmd, lv, name, parms);
     128         [ #  # ]:          0 :         if (progress == PROGRESS_CHECK_FAILED)
     129                 :          0 :                 return_0;
     130                 :            : 
     131         [ #  # ]:          0 :         if (progress == PROGRESS_UNFINISHED) {
     132                 :            :                 /* The only case the caller *should* try again later */
     133                 :          0 :                 *finished = 0;
     134                 :          0 :                 return 1;
     135                 :            :         }
     136                 :            : 
     137         [ #  # ]:          0 :         if (!(lvs_changed = lvs_using_lv(cmd, vg, lv))) {
     138                 :          0 :                 log_error("ABORTING: Failed to generate list of copied LVs");
     139                 :          0 :                 return 0;
     140                 :            :         }
     141                 :            : 
     142                 :            :         /* Finished? Or progress to next segment? */
     143         [ #  # ]:          0 :         if (progress == PROGRESS_FINISHED_ALL) {
     144         [ #  # ]:          0 :                 if (!parms->poll_fns->finish_copy(cmd, vg, lv, lvs_changed))
     145                 :          0 :                         return 0;
     146                 :            :         } else {
     147   [ #  #  #  # ]:          0 :                 if (parms->poll_fns->update_metadata &&
     148                 :          0 :                     !parms->poll_fns->update_metadata(cmd, vg, lv, lvs_changed, 0)) {
     149                 :          0 :                         log_error("ABORTING: Segment progression failed.");
     150                 :          0 :                         parms->poll_fns->finish_copy(cmd, vg, lv, lvs_changed);
     151                 :          0 :                         return 0;
     152                 :            :                 }
     153                 :          0 :                 *finished = 0;  /* Another segment */
     154                 :            :         }
     155                 :            : 
     156                 :          0 :         return 1;
     157                 :            : }
     158                 :            : 
     159                 :          0 : static void _sleep_and_rescan_devices(struct daemon_parms *parms)
     160                 :            : {
     161                 :            :         /* FIXME Use alarm for regular intervals instead */
     162 [ #  # ][ #  # ]:          0 :         if (parms->interval && !parms->aborting) {
     163                 :          0 :                 sleep(parms->interval);
     164                 :            :                 /* Devices might have changed while we slept */
     165                 :          0 :                 init_full_scan_done(0);
     166                 :            :         }
     167                 :          0 : }
     168                 :            : 
     169                 :          0 : static int _wait_for_single_lv(struct cmd_context *cmd, const char *name, const char *uuid,
     170                 :            :                                struct daemon_parms *parms)
     171                 :            : {
     172                 :            :         struct volume_group *vg;
     173                 :            :         struct logical_volume *lv;
     174                 :          0 :         int finished = 0;
     175                 :            : 
     176                 :            :         /* Poll for completion */
     177         [ #  # ]:          0 :         while (!finished) {
     178         [ #  # ]:          0 :                 if (parms->wait_before_testing)
     179                 :          0 :                         _sleep_and_rescan_devices(parms);
     180                 :            : 
     181                 :            :                 /* Locks the (possibly renamed) VG again */
     182                 :          0 :                 vg = parms->poll_fns->get_copy_vg(cmd, name, uuid);
     183         [ #  # ]:          0 :                 if (vg_read_error(vg)) {
     184                 :          0 :                         vg_release(vg);
     185                 :          0 :                         log_error("ABORTING: Can't reread VG for %s", name);
     186                 :            :                         /* What more could we do here? */
     187                 :          0 :                         return 0;
     188                 :            :                 }
     189                 :            : 
     190         [ #  # ]:          0 :                 if (!(lv = parms->poll_fns->get_copy_lv(cmd, vg, name, uuid,
     191                 :            :                                                         parms->lv_type))) {
     192                 :          0 :                         log_error("ABORTING: Can't find LV in %s for %s",
     193                 :            :                                   vg->name, name);
     194                 :          0 :                         unlock_and_release_vg(cmd, vg, vg->name);
     195                 :          0 :                         return 0;
     196                 :            :                 }
     197                 :            : 
     198         [ #  # ]:          0 :                 if (!_check_lv_status(cmd, vg, lv, name, parms, &finished)) {
     199                 :          0 :                         unlock_and_release_vg(cmd, vg, vg->name);
     200                 :          0 :                         return 0;
     201                 :            :                 }
     202                 :            : 
     203                 :          0 :                 unlock_and_release_vg(cmd, vg, vg->name);
     204                 :            : 
     205                 :            :                 /*
     206                 :            :                  * FIXME Sleeping after testing, while preferred, also works around
     207                 :            :                  * unreliable "finished" state checking in _percent_run.  If the
     208                 :            :                  * above _check_lv_status is deferred until after the first sleep it
     209                 :            :                  * may be that a polldaemon will run without ever completing.
     210                 :            :                  *
     211                 :            :                  * This happens when one snapshot-merge polldaemon is racing with
     212                 :            :                  * another (polling the same LV).  The first to see the LV status
     213                 :            :                  * reach the "finished" state will alter the LV that the other
     214                 :            :                  * polldaemon(s) are polling.  These other polldaemon(s) can then
     215                 :            :                  * continue polling an LV that doesn't have a "status".
     216                 :            :                  */
     217         [ #  # ]:          0 :                 if (!parms->wait_before_testing)
     218                 :          0 :                         _sleep_and_rescan_devices(parms);
     219                 :            :         }
     220                 :            : 
     221                 :          0 :         return 1;
     222                 :            : }
     223                 :            : 
     224                 :          0 : static int _poll_vg(struct cmd_context *cmd, const char *vgname,
     225                 :            :                     struct volume_group *vg, void *handle)
     226                 :            : {
     227                 :          0 :         struct daemon_parms *parms = (struct daemon_parms *) handle;
     228                 :            :         struct lv_list *lvl;
     229                 :            :         struct logical_volume *lv;
     230                 :            :         const char *name;
     231                 :            :         int finished;
     232                 :            : 
     233         [ #  # ]:          0 :         dm_list_iterate_items(lvl, &vg->lvs) {
     234                 :          0 :                 lv = lvl->lv;
     235         [ #  # ]:          0 :                 if (!(lv->status & parms->lv_type))
     236                 :          0 :                         continue;
     237         [ #  # ]:          0 :                 if (!(name = parms->poll_fns->get_copy_name_from_lv(lv)))
     238                 :          0 :                         continue;
     239                 :            :                 /* FIXME Need to do the activation from _set_up_pvmove here
     240                 :            :                  *       if it's not running and we're not aborting */
     241 [ #  # ][ #  # ]:          0 :                 if (_check_lv_status(cmd, vg, lv, name, parms, &finished) &&
     242                 :          0 :                     !finished)
     243                 :          0 :                         parms->outstanding_count++;
     244                 :            :         }
     245                 :            : 
     246                 :          0 :         return ECMD_PROCESSED;
     247                 :            : 
     248                 :            : }
     249                 :            : 
     250                 :          0 : static void _poll_for_all_vgs(struct cmd_context *cmd,
     251                 :            :                               struct daemon_parms *parms)
     252                 :            : {
     253                 :            :         while (1) {
     254                 :          0 :                 parms->outstanding_count = 0;
     255                 :          0 :                 process_each_vg(cmd, 0, NULL, READ_FOR_UPDATE, parms, _poll_vg);
     256         [ #  # ]:          0 :                 if (!parms->outstanding_count)
     257                 :            :                         break;
     258                 :          0 :                 sleep(parms->interval);
     259                 :          0 :         }
     260                 :          0 : }
     261                 :            : 
     262                 :            : /*
     263                 :            :  * Only allow *one* return from poll_daemon() (the parent).
     264                 :            :  * If there is a child it must exit (ignoring the memory leak messages).
     265                 :            :  * - 'background' is advisory so a child polldaemon may not be used even
     266                 :            :  *   if it was requested.
     267                 :            :  */
     268                 :          0 : int poll_daemon(struct cmd_context *cmd, const char *name, const char *uuid,
     269                 :            :                 unsigned background,
     270                 :            :                 uint32_t lv_type, struct poll_functions *poll_fns,
     271                 :            :                 const char *progress_title)
     272                 :            : {
     273                 :            :         struct daemon_parms parms;
     274                 :          0 :         int daemon_mode = 0;
     275                 :          0 :         int ret = ECMD_PROCESSED;
     276                 :            :         sign_t interval_sign;
     277                 :            : 
     278                 :          0 :         parms.aborting = arg_is_set(cmd, abort_ARG);
     279                 :          0 :         parms.background = background;
     280                 :          0 :         interval_sign = arg_sign_value(cmd, interval_ARG, 0);
     281         [ #  # ]:          0 :         if (interval_sign == SIGN_MINUS)
     282                 :          0 :                 log_error("Argument to --interval cannot be negative");
     283                 :          0 :         parms.interval = arg_uint_value(cmd, interval_ARG,
     284                 :          0 :                                         find_config_tree_int(cmd, "activation/polling_interval",
     285                 :            :                                                              DEFAULT_INTERVAL));
     286                 :          0 :         parms.wait_before_testing = (interval_sign == SIGN_PLUS);
     287                 :          0 :         parms.progress_display = 1;
     288                 :          0 :         parms.progress_title = progress_title;
     289                 :          0 :         parms.lv_type = lv_type;
     290                 :          0 :         parms.poll_fns = poll_fns;
     291                 :            : 
     292   [ #  #  #  # ]:          0 :         if (parms.interval && !parms.aborting)
     293         [ #  # ]:          0 :                 log_verbose("Checking progress %s waiting every %u seconds",
     294                 :            :                             (parms.wait_before_testing ? "after" : "before"),
     295                 :            :                             parms.interval);
     296                 :            : 
     297         [ #  # ]:          0 :         if (!parms.interval) {
     298                 :          0 :                 parms.progress_display = 0;
     299                 :            : 
     300                 :            :                 /* FIXME Disabled multiple-copy wait_event */
     301         [ #  # ]:          0 :                 if (!name)
     302                 :          0 :                         parms.interval = find_config_tree_int(cmd, "activation/polling_interval",
     303                 :            :                                                               DEFAULT_INTERVAL);
     304                 :            :         }
     305                 :            : 
     306         [ #  # ]:          0 :         if (parms.background) {
     307                 :          0 :                 daemon_mode = _become_daemon(cmd);
     308         [ #  # ]:          0 :                 if (daemon_mode == 0)
     309                 :          0 :                         return ECMD_PROCESSED;      /* Parent */
     310         [ #  # ]:          0 :                 else if (daemon_mode == 1)
     311                 :          0 :                         parms.progress_display = 0; /* Child */
     312                 :            :                 /* FIXME Use wait_event (i.e. interval = 0) and */
     313                 :            :                 /*       fork one daemon per copy? */
     314                 :            :         }
     315                 :            : 
     316                 :            :         /*
     317                 :            :          * Process one specific task or all incomplete tasks?
     318                 :            :          */
     319         [ #  # ]:          0 :         if (name) {
     320         [ #  # ]:          0 :                 if (!_wait_for_single_lv(cmd, name, uuid, &parms)) {
     321                 :          0 :                         stack;
     322                 :          0 :                         ret = ECMD_FAILED;
     323                 :            :                 }
     324                 :            :         } else
     325                 :          0 :                 _poll_for_all_vgs(cmd, &parms);
     326                 :            : 
     327 [ #  # ][ #  # ]:          0 :         if (parms.background && daemon_mode == 1) {
     328                 :            :                 /*
     329                 :            :                  * child was successfully forked:
     330                 :            :                  * background polldaemon must not return to the caller
     331                 :            :                  * because it will redundantly continue performing the
     332                 :            :                  * caller's task (that the parent already performed)
     333                 :            :                  */
     334                 :            :                 /* FIXME Attempt proper cleanup */
     335                 :          0 :                 _exit(lvm_return_code(ret));
     336                 :            :         }
     337                 :            : 
     338                 :          0 :         return ret;
     339                 :            : }

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