lib/libhammer/info.c

   1 /*
   2  * Copyright (c) 2011 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Antonio Huete <tuxillo@quantumachine.net>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <dirent.h>
  36 #include <err.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <sys/param.h>
  43 #include <sys/stat.h>
  44 #include <unistd.h>
  45
  46 #include "libhammer.h"
  47
  48 libhammer_fsinfo_t
  49 libhammer_get_fsinfo(const char *path)
  50 {
  51         struct hammer_pseudofs_data *pfs_od;
  52         struct hammer_ioc_pseudofs_rw pfs;
  53         struct hammer_ioc_info info;
  54         libhammer_pfsinfo_t pip;
  55         libhammer_fsinfo_t fip;
  56         int error = 0;
  57         int fd;
  58
  59         if ((fd = open(path, O_RDONLY)) < 0)
  60                 return NULL;
  61
  62         fip = _libhammer_malloc(sizeof(*fip));
  63         TAILQ_INIT(&fip->list_pseudo);
  64         if ((ioctl(fd, HAMMERIOC_GET_INFO, &info)) < 0) {
  65                 libhammer_free_fsinfo(fip);
  66                 close(fd);
  67                 return NULL;
  68         }
  69
  70         /* Fill filesystem information */
  71         snprintf(fip->vol_name, TXTLEN, "%s", info.vol_label);
  72         fip->vol_fsid = info.vol_fsid;
  73         fip->version = info.version;
  74         fip->nvolumes = info.nvolumes;
  75         fip->rootvol = info.rootvol;
  76         fip->inodes = info.inodes;
  77         fip->bigblocks = info.bigblocks;
  78         fip->freebigblocks = info.freebigblocks;
  79         fip->rsvbigblocks = info.rsvbigblocks;
  80
  81         bzero(&pfs, sizeof(pfs));
  82         pfs.pfs_id = 0; /* start off with root PFS */
  83         pfs.ondisk = _libhammer_malloc(sizeof(*pfs_od));
  84         pfs.bytes = sizeof(struct hammer_pseudofs_data);
  85
  86         while(error == 0) {
  87                 error = ioctl(fd, HAMMERIOC_SCAN_PSEUDOFS, &pfs);
  88                 if (error == 0 && !hammer_is_pfs_deleted(pfs.ondisk)) {
  89                         pip = _libhammer_malloc(sizeof(*pip));
  90                         pfs_od = pfs.ondisk;
  91                         pip->ismaster = hammer_is_pfs_master(pfs_od);
  92
  93                         /*
  94                          * Fill in structs used in the library. We don't rely on
  95                          * HAMMER structs but we do fill our own.
  96                          */
  97                         pip->version = fip->version;
  98                         pip->pfs_id = pfs.pfs_id;
  99                         pip->mirror_flags = pfs_od->mirror_flags;
 100                         pip->beg_tid = pfs_od->sync_beg_tid;
 101                         pip->end_tid = pfs_od->sync_end_tid;
 102                         pip->mountedon =
 103                             libhammer_find_pfs_mount(&pfs_od->unique_uuid);
 104                         if (fip->version < 3) {
 105                                 libhammer_compat_old_snapcount(pip);
 106                         } else {
 107                                 TAILQ_INIT(&pip->list_snap);
 108                                 if (libhammer_pfs_get_snapshots(fip, pip) < 0)
 109                                         pip->snapcount = 0;
 110                         }
 111
 112                         /*
 113                          * PFS retrieval goes 0..n so inserting in the tail
 114                          * leaves the TAILQ sorted by pfs_id.
 115                          * This is important since quickly getting PFS #0 is
 116                          * required for some functions so *DO NOT CHANGE IT*.
 117                          */
 118                         TAILQ_INSERT_TAIL(&fip->list_pseudo, pip, entries);
 119
 120                 }
 121                 pfs.pfs_id++;
 122         }
 123         free(pfs.ondisk);
 124
 125         close (fd);
 126
 127         return (fip);
 128 }
 129
 130 void
 131 libhammer_free_fsinfo(libhammer_fsinfo_t fip)
 132 {
 133         struct libhammer_pfsinfo *pfstmp;
 134
 135         while(!TAILQ_EMPTY(&fip->list_pseudo)) {
 136                 pfstmp = TAILQ_FIRST(&fip->list_pseudo);
 137                 libhammer_pfs_free_snapshots(pfstmp);
 138                 if (pfstmp->mountedon)
 139                         free(pfstmp->mountedon);
 140                 TAILQ_REMOVE(&fip->list_pseudo, pfstmp, entries);
 141                 free(pfstmp);
 142         }
 143         free(fip);
 144 }