sbin/hammer2/cmd_snapshot.c

   1 /*
   2  * Copyright (c) 2011-2013 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@dragonflybsd.org>
   6  * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "hammer2.h"
  37
  38 /*
  39  * The snapshot is named <PFSNAME>_<YYYYMMDD.HHMMSS.TRANSID> unless
  40  * overridden by a label.
  41  *
  42  * When local non-cache media is involved the media is
  43  * first synchronized and the snapshot is then based on
  44  * the media.
  45  *
  46  * If the media is remote the snapshot is created on the remote
  47  * end (if you have sufficient administrative rights) and a local
  48  * ADMIN or CACHE PFS is created with a connection to the snapshot
  49  * on the remote.
  50  *
  51  * If the client has snapshot rights to multiple remotes then TBD.
  52  */
  53
  54 int
  55 cmd_pfs_snapshot(const char *sel_path, const char *path, const char *label)
  56 {
  57         hammer2_ioc_pfs_t pfs;
  58         int ecode = 0;
  59         int fd;
  60         char filename[HAMMER2_INODE_MAXNAME];
  61         char *xname;
  62         time_t t;
  63         struct tm *tp;
  64
  65         if (path == NULL) {
  66                 fd = hammer2_ioctl_handle(sel_path);
  67                 xname = strdup("");
  68         } else {
  69                 fd = open(path, O_RDONLY);
  70                 if (fd < 0)
  71                         fprintf(stderr, "Unable to open %s\n", path);
  72                 if (strrchr(path, '/'))
  73                         asprintf(&xname, ".%s", strrchr(path, '/') + 1);
  74                 else if (*path)
  75                         asprintf(&xname, ".%s", path);
  76                 else
  77                         xname = strdup("");
  78         }
  79         if (fd < 0)
  80                 return 1;
  81
  82         if (label == NULL) {
  83                 time(&t);
  84                 tp = localtime(&t);
  85                 bzero(&pfs, sizeof(pfs));
  86                 pfs.name_key = (hammer2_key_t)-1;
  87                 if (ioctl(fd, HAMMER2IOC_PFS_GET, &pfs) < 0) {
  88                         perror("ioctl");
  89                 }
  90                 snprintf(filename, sizeof(filename),
  91                          "%s%s.%04d%02d%02d.%02d%02d%02d",
  92                          pfs.name,
  93                          xname,
  94                          tp->tm_year + 1900,
  95                          tp->tm_mon + 1,
  96                          tp->tm_mday,
  97                          tp->tm_hour,
  98                          tp->tm_min,
  99                          tp->tm_sec);
 100                 label = filename;
 101         }
 102
 103         bzero(&pfs, sizeof(pfs));
 104         snprintf(pfs.name, sizeof(pfs.name), "%s", label);
 105
 106         if (ioctl(fd, HAMMER2IOC_PFS_SNAPSHOT, &pfs) < 0) {
 107                 perror("ioctl");
 108                 ecode = 1;
 109         } else {
 110                 printf("created snapshot %s\n", label);
 111         }
 112         return ecode;
 113 }