sbin/hammer/cmd_info.c

   1 /*
   2  * Copyright (c) 2009 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 "hammer.h"
  36 #include <libutil.h>
  37
  38 void    show_info(char *path);
  39 char    *find_pfs_mount(int pfsid, uuid_t parentuuid, int ismaster);
  40 double  percent(int64_t value, int64_t total);
  41 u_int32_t count_snapshots(int fd, u_int32_t version, char *pfs_snapshots, char *mountedon);
  42
  43 void
  44 hammer_cmd_info(void)
  45 {
  46         struct statfs *stfsbuf;
  47         int mntsize, i, first = 1;
  48         char *fstype, *path;
  49
  50         tzset();
  51         mntsize = getmntinfo(&stfsbuf, MNT_NOWAIT);
  52         if (mntsize > 0) {
  53                 for (i=0; i < mntsize; i++) {
  54                         fstype = stfsbuf[i].f_fstypename;
  55                         path = stfsbuf[i].f_mntonname;
  56                         if ((strcmp(fstype, "hammer")) == 0) {
  57                                 if (first)
  58                                         first = 0;
  59                                 else
  60                                         fprintf(stdout, "\n");
  61                                 show_info(path);
  62                         }
  63                 }
  64         } else {
  65                 fprintf(stdout, "No mounted filesystems found\n");
  66         }
  67
  68 }
  69
  70 void
  71 show_info(char *path)
  72 {
  73         struct      hammer_pseudofs_data pfs_od;
  74         struct      hammer_ioc_pseudofs_rw pfs;
  75         int64_t     usedbigblocks, bytes;
  76         struct      hammer_ioc_info info;
  77         int         fd, pfs_id, ismaster;
  78         char        *fsid;
  79         char        *mountedon;
  80         char        buf[6];
  81         u_int32_t   sc;
  82
  83         fsid = mountedon = NULL;
  84         usedbigblocks = 0;
  85         pfs_id = 0;           /* Include PFS#0 */
  86         bytes = 0;
  87         sc = 0;
  88
  89         bzero(&info, sizeof(struct hammer_ioc_info));
  90
  91         /* Try to get a file descriptor based on the path given */
  92         fd = open(path, O_RDONLY);
  93         if (fd < 0) {
  94                 perror("show_info");
  95                 exit(EXIT_FAILURE);
  96         }
  97
  98         if ((ioctl(fd, HAMMERIOC_GET_INFO, &info)) < 0) {
  99                 perror("show_info");
 100                 exit(EXIT_FAILURE);
 101         }
 102
 103         /* Find out the UUID strings */
 104         uuid_to_string(&info.vol_fsid, &fsid, NULL);
 105
 106         /* Volume information */
 107         fprintf(stdout, "Volume identification\n");
 108         fprintf(stdout, "\tLabel               %s\n", info.vol_name);
 109         fprintf(stdout, "\tNo. Volumes         %d\n", info.nvolumes);
 110         fprintf(stdout, "\tFSID                %s\n", fsid);
 111         fprintf(stdout, "\tHAMMER Version      %d\n", info.version);
 112
 113         /* Big blocks information */
 114         usedbigblocks = info.bigblocks - info.freebigblocks;
 115
 116         fprintf(stdout, "Big block information\n");
 117         fprintf(stdout, "\tTotal      %10jd\n", (intmax_t)info.bigblocks);
 118         fprintf(stdout, "\tUsed       %10jd (%.2lf%%)\n"
 119                         "\tReserved   %10jd (%.2lf%%)\n"
 120                         "\tFree       %10jd (%.2lf%%)\n",
 121                         (intmax_t)usedbigblocks,
 122                         percent(usedbigblocks, info.bigblocks),
 123                         (intmax_t)info.rsvbigblocks,
 124                         percent(info.rsvbigblocks, info.bigblocks),
 125                         (intmax_t)(info.freebigblocks - info.rsvbigblocks),
 126                         percent(info.freebigblocks - info.rsvbigblocks,
 127                                 info.bigblocks));
 128         fprintf(stdout, "Space information\n");
 129
 130         /* Space information */
 131         fprintf(stdout, "\tNo. Inodes %10jd\n", (intmax_t)info.inodes);
 132         bytes = (info.bigblocks << HAMMER_LARGEBLOCK_BITS);
 133         humanize_number(buf, sizeof(buf)  - (bytes < 0 ? 0 : 1), bytes, "",
 134                         HN_AUTOSCALE, HN_DECIMAL | HN_NOSPACE | HN_B);
 135         fprintf(stdout, "\tTotal size     %6s (%jd bytes)\n",
 136                 buf, (intmax_t)bytes);
 137
 138         bytes = (usedbigblocks << HAMMER_LARGEBLOCK_BITS);
 139         humanize_number(buf, sizeof(buf)  - (bytes < 0 ? 0 : 1), bytes, "",
 140                         HN_AUTOSCALE, HN_DECIMAL | HN_NOSPACE | HN_B);
 141         fprintf(stdout, "\tUsed space     %6s\n", buf);
 142
 143         bytes = (info.rsvbigblocks << HAMMER_LARGEBLOCK_BITS);
 144         humanize_number(buf, sizeof(buf)  - (bytes < 0 ? 0 : 1), bytes, "",
 145                         HN_AUTOSCALE, HN_DECIMAL | HN_NOSPACE | HN_B);
 146         fprintf(stdout, "\tReserved space %6s\n", buf);
 147
 148         bytes = ((info.freebigblocks - info.rsvbigblocks) << HAMMER_LARGEBLOCK_BITS);
 149         humanize_number(buf, sizeof(buf)  - (bytes < 0 ? 0 : 1), bytes, "",
 150                         HN_AUTOSCALE, HN_DECIMAL | HN_NOSPACE | HN_B);
 151         fprintf(stdout, "\tFree space     %6s\n", buf);
 152
 153         /* Pseudo-filesystem information */
 154         fprintf(stdout, "PFS information\n");
 155         fprintf(stdout, "\tPFS-Id  Mode    Snaps  Mounted-on\n");
 156
 157         while(pfs_id < HAMMER_MAX_PFS) {
 158                 bzero(&pfs, sizeof(pfs));
 159                 bzero(&pfs_od, sizeof(pfs_od));
 160                 pfs.pfs_id = pfs_id;
 161                 pfs.ondisk = &pfs_od;
 162                 pfs.bytes = sizeof(pfs_od);
 163                 pfs.version = HAMMER_IOC_PSEUDOFS_VERSION;
 164                 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) >= 0) {
 165                         ismaster = (pfs_od.mirror_flags & HAMMER_PFSD_SLAVE) ? 0 : 1;
 166                         if (pfs_id == 0)
 167                                 mountedon = strdup(path);
 168                         else
 169                                 mountedon = find_pfs_mount(pfs_id, info.vol_fsid, ismaster);
 170
 171                         sc = count_snapshots(fd, info.version, pfs_od.snapshots, mountedon);
 172
 173                         fprintf(stdout, "\t%6d  %-6s %6d  ",
 174                                 pfs_id, (ismaster ? "MASTER" : "SLAVE"), sc);
 175                         if (mountedon)
 176                                 fprintf(stdout, "%s", mountedon);
 177                         else
 178                                 fprintf(stdout, "not-mounted");
 179                         fprintf(stdout, "\n");
 180                 }
 181                 pfs_id++;
 182         }
 183
 184         free(fsid);
 185         free(mountedon);
 186 }
 187
 188 char *
 189 find_pfs_mount(int pfsid, uuid_t parentuuid, int ismaster)
 190 {
 191         struct hammer_ioc_info hi;
 192         struct statfs *mntbuf;
 193         int mntsize;
 194         int curmount;
 195         int fd;
 196         size_t  mntbufsize;
 197         char *trailstr;
 198         char *retval;
 199
 200         retval = NULL;
 201
 202         /* Do not continue if there are no mounted filesystems */
 203         mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
 204         if (mntsize <= 0)
 205                 return retval;
 206
 207         mntbufsize = (mntsize) * sizeof(struct statfs);
 208         mntbuf = malloc(mntbufsize);
 209         if (mntbuf == NULL) {
 210                 perror("show_info");
 211                 exit(EXIT_FAILURE);
 212         }
 213
 214         mntsize = getfsstat(mntbuf, (long)mntbufsize, MNT_NOWAIT);
 215         curmount = mntsize - 1;
 216
 217         asprintf(&trailstr, ":%05d", pfsid);
 218
 219         /*
 220          * Iterate all the mounted points looking for the PFS passed to
 221          * this function.
 222          */
 223         while(curmount >= 0) {
 224                 /*
 225                  * We need to avoid that PFS belonging to other HAMMER
 226                  * filesystems are showed as mounted, so we compare
 227                  * against the FSID, which is presumable to be unique.
 228                  */
 229                 bzero(&hi, sizeof(hi));
 230                 if ((fd = open(mntbuf[curmount].f_mntfromname, O_RDONLY)) < 0) {
 231                         curmount--;
 232                         continue;
 233                 }
 234
 235                 if ((ioctl(fd, HAMMERIOC_GET_INFO, &hi)) < 0) {
 236                         curmount--;
 237                         continue;
 238                 }
 239
 240                 if (strstr(mntbuf[curmount].f_mntfromname, trailstr) != NULL &&
 241                     (uuid_compare(&hi.vol_fsid, &parentuuid, NULL)) == 0) {
 242                         if (ismaster) {
 243                                 if (strstr(mntbuf[curmount].f_mntfromname, "@@-1") != NULL) {
 244                                         retval = strdup(mntbuf[curmount].f_mntonname);
 245                                         break;
 246                                 }
 247                         } else {
 248                                 if (strstr(mntbuf[curmount].f_mntfromname, "@@0x") != NULL ) {
 249                                         retval = strdup(mntbuf[curmount].f_mntonname);
 250                                         break;
 251                                 }
 252                         }
 253                 }
 254                 curmount--;
 255         }
 256         free(trailstr);
 257         return retval;
 258 }
 259
 260 double
 261 percent(int64_t value, int64_t total)
 262 {
 263         /* Avoid divide-by-zero */
 264         if (total == 0)
 265                 return 100.0;
 266
 267         return ((value * 100.0) / (double)total);
 268 }
 269
 270 u_int32_t
 271 count_snapshots(int fd, u_int32_t version, char *pfs_snapshots, char *mountedon)
 272 {
 273         struct hammer_ioc_snapshot snapinfo;
 274         char *snapshots_path, *fpath;
 275         struct dirent *den;
 276         struct stat st;
 277         DIR *dir;
 278         u_int32_t snapshot_count = 0;
 279
 280         bzero(&snapinfo, sizeof(struct hammer_ioc_snapshot));
 281         if (version < 3) {
 282                 /*
 283                  * old style: count the number of softlinks in the snapshots dir
 284                  */
 285                 if (pfs_snapshots[0])
 286                         snapshots_path = pfs_snapshots;
 287                 else
 288                         asprintf(&snapshots_path, "%s/snapshots", mountedon);
 289                 if ((dir = opendir(snapshots_path)) != NULL) {
 290                         while ((den = readdir(dir)) != NULL) {
 291                                 if (den->d_name[0] == '.')
 292                                         continue;
 293                                 asprintf(&fpath, "%s/%s", snapshots_path, den->d_name);
 294                                 if (lstat(fpath, &st) == 0 && S_ISLNK(st.st_mode))
 295                                         snapshot_count++;
 296                                 free(fpath);
 297                         }
 298                         closedir(dir);
 299                 }
 300         } else {
 301                 /*
 302                  * new style: file system meta-data
 303                  */
 304                 do {
 305                         if (ioctl(fd, HAMMERIOC_GET_SNAPSHOT, &snapinfo) < 0) {
 306                                 perror("count_snapshots");
 307                                 exit(EXIT_FAILURE);
 308                         }
 309                         snapshot_count += snapinfo.count;
 310                 } while (snapinfo.head.error == 0 && snapinfo.count);
 311         }
 312         return snapshot_count;
 313 }