LCOV - code coverage report
Current view: top level - mkfs - metafs.c (source / functions) Hit Total Coverage
Test: gfs2-utils.info Lines: 0 75 0.0 %
Date: 2023-09-27 13:48:55 Functions: 0 6 0.0 %

          Line data    Source code
       1             : #include <stdlib.h>
       2             : #include <string.h>
       3             : #include <stdio.h>
       4             : #include <unistd.h>
       5             : #include <sys/file.h>
       6             : #include <sys/types.h>
       7             : #include <sys/stat.h>
       8             : #include <sys/mount.h>
       9             : #include <fcntl.h>
      10             : #include <errno.h>
      11             : #include <signal.h>
      12             : #include <mntent.h>
      13             : #include <libintl.h>
      14             : #include <locale.h>
      15             : #define _(String) gettext(String)
      16             : 
      17             : #include "metafs.h"
      18             : 
      19             : int metafs_interrupted;
      20             : 
      21           0 : static int lock_for_admin(struct metafs *mfs, int debug)
      22             : {
      23             :         int error;
      24             : 
      25           0 :         if (debug)
      26           0 :                 printf(_("Trying to get admin lock..."));
      27             : 
      28           0 :         mfs->fd = open(mfs->path, O_RDONLY | O_NOFOLLOW);
      29           0 :         if (mfs->fd < 0)
      30           0 :                 return -1;
      31             : 
      32           0 :         error = flock(mfs->fd, LOCK_EX);
      33           0 :         if (error) {
      34           0 :                 close(mfs->fd);
      35           0 :                 return -1;
      36             :         }
      37           0 :         if (debug)
      38           0 :                 printf(_("locked.\n"));
      39           0 :         return 0;
      40             : }
      41             : 
      42           0 : static void sighandler(int error)
      43             : {
      44           0 :         metafs_interrupted = 1;
      45           0 : }
      46             : 
      47           0 : static void setsigs(void (*handler)(int))
      48             : {
      49           0 :         struct sigaction sa = { .sa_handler = handler };
      50             : 
      51           0 :         sigaction(SIGINT, &sa, NULL);
      52           0 :         sigaction(SIGILL, &sa, NULL);
      53           0 :         sigaction(SIGTERM, &sa, NULL);
      54           0 :         sigaction(SIGHUP, &sa, NULL);
      55           0 :         sigaction(SIGABRT, &sa, NULL);
      56           0 :         sigaction(SIGCONT, &sa, NULL);
      57           0 :         sigaction(SIGUSR1, &sa, NULL);
      58           0 :         sigaction(SIGUSR2, &sa, NULL);
      59           0 : }
      60             : 
      61           0 : int mount_gfs2_meta(struct metafs *mfs, const char *path, int debug)
      62             : {
      63             :         int ret;
      64             : 
      65           0 :         mfs->path = strdup("/tmp/.gfs2meta.XXXXXX");
      66           0 :         if (mfs->path == NULL)
      67           0 :                 return -1;
      68             : 
      69           0 :         if(!mkdtemp(mfs->path))
      70           0 :                 goto err_free;
      71             : 
      72           0 :         setsigs(sighandler);
      73             : 
      74           0 :         ret = mount(path, mfs->path, "gfs2meta", 0, mfs->context);
      75           0 :         if (ret)
      76           0 :                 goto err_rmdir;
      77             : 
      78           0 :         if (lock_for_admin(mfs, debug))
      79           0 :                 goto err_umount;
      80             : 
      81           0 :         return 0;
      82             : 
      83           0 : err_umount:
      84           0 :         if (umount(mfs->path))
      85             :                 /* Translators: the first %s here is a path, the second is an error message */
      86           0 :                 fprintf(stderr, _("Could not unmount %s: %s\n"),
      87           0 :                                     mfs->path, strerror(errno));
      88           0 :         setsigs(SIG_DFL);
      89           0 : err_rmdir:
      90           0 :         rmdir(mfs->path);
      91           0 : err_free:
      92           0 :         free(mfs->path);
      93           0 :         mfs->path = NULL;
      94           0 :         return -1;
      95             : }
      96             : 
      97           0 : void cleanup_metafs(struct metafs *mfs)
      98             : {
      99             :         int ret;
     100             : 
     101           0 :         if (mfs->fd <= 0)
     102           0 :                 return;
     103             : 
     104           0 :         fsync(mfs->fd);
     105           0 :         close(mfs->fd);
     106           0 :         ret = umount(mfs->path);
     107           0 :         if (ret)
     108             :                 /* Translators: the first %s here is a path, the second is an error message */
     109           0 :                 fprintf(stderr, "Could not unmount %s : %s\n",
     110           0 :                         mfs->path, strerror(errno));
     111             :         else
     112           0 :                 rmdir(mfs->path);
     113             : 
     114           0 :         setsigs(SIG_DFL);
     115           0 :         metafs_interrupted = 0;
     116             : 
     117           0 :         free(mfs->path);
     118           0 :         mfs->path = NULL;
     119           0 :         free(mfs->context);
     120           0 :         mfs->context = NULL;
     121             : }
     122             : 
     123             : /**
     124             :  * Returns a duplicate of the 'context' mount option, or NULL if not found.
     125             :  */
     126           0 : char *copy_context_opt(struct mntent *mnt)
     127             : {
     128             :         char *ctx, *end;
     129             : 
     130           0 :         ctx = hasmntopt(mnt, "context");
     131           0 :         if (ctx == NULL)
     132           0 :                 return NULL;
     133             : 
     134           0 :         end = strchr(ctx, ',');
     135           0 :         if (end == NULL)
     136           0 :                 return NULL;
     137             : 
     138           0 :         return strndup(ctx, end - ctx);
     139             : }

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