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 (u_int32_t version,
  42     char *pfs_snapshots, char *mountedon, int *errorp);
  43
  44 void
  45 hammer_cmd_info(void)
  46 {
  47         struct statfs *stfsbuf;
  48         int mntsize, i, first = 1;
  49         char *fstype, *path;
  50
  51         tzset();
  52         mntsize = getmntinfo(&stfsbuf, MNT_NOWAIT);
  53         if (mntsize > 0) {
  54                 for (i = 0; i < mntsize; i++) {
  55                         fstype = stfsbuf[i].f_fstypename;
  56                         path = stfsbuf[i].f_mntonname;
  57                         if ((strcmp(fstype, "hammer")) == 0) {
  58                                 if (first)
  59                                         first = 0;
  60                                 else
  61                                         fprintf(stdout, "\n");
  62                                 show_info(path);
  63                         }
  64                 }
  65         } else {
  66                 fprintf(stdout, "No mounted filesystems found\n");
  67         }
  68
  69 }
  70
  71 void
  72 show_info(char *path)
  73 {
  74         struct      hammer_pseudofs_data pfs_od;
  75         struct      hammer_ioc_pseudofs_rw pfs;
  76         int64_t     usedbigblocks;
  77         int64_t     usedbytes, rsvbytes;
  78         int64_t     totalbytes, freebytes;
  79         struct      hammer_ioc_info info;
  80         int         fd, pfs_id, ismaster, error;
  81         char        *fsid;
  82         char        *mountedon;
  83         char        buf[6];
  84         u_int32_t   sc;
  85
  86         fsid = mountedon = NULL;
  87         usedbigblocks = 0;
  88         pfs_id = 0;           /* Include PFS#0 */
  89         usedbytes = totalbytes = rsvbytes = freebytes = 0;
  90         sc = error = 0;
  91
  92         bzero(&info, sizeof(struct hammer_ioc_info));
  93
  94         /* Try to get a file descriptor based on the path given */
  95         fd = open(path, O_RDONLY);
  96         if (fd < 0) {
  97                 perror("show_info");
  98                 exit(EXIT_FAILURE);
  99         }
 100
 101         if ((ioctl(fd, HAMMERIOC_GET_INFO, &info)) < 0) {
 102                 perror("show_info");
 103                 exit(EXIT_FAILURE);
 104         }
 105
 106         /* Find out the UUID strings */
 107         uuid_to_string(&info.vol_fsid, &fsid, NULL);
 108
 109         /* Volume information */
 110         fprintf(stdout, "Volume identification\n");
 111         fprintf(stdout, "\tLabel               %s\n", info.vol_name);
 112         fprintf(stdout, "\tNo. Volumes         %d\n", info.nvolumes);
 113         fprintf(stdout, "\tFSID                %s\n", fsid);
 114         fprintf(stdout, "\tHAMMER Version      %d\n", info.version);
 115
 116         /* Big blocks information */
 117         usedbigblocks = info.bigblocks - info.freebigblocks;
 118
 119         fprintf(stdout, "Big block information\n");
 120         fprintf(stdout, "\tTotal      %10jd\n", (intmax_t)info.bigblocks);
 121         fprintf(stdout, "\tUsed       %10jd (%.2lf%%)\n"
 122                         "\tReserved   %10jd (%.2lf%%)\n"
 123                         "\tFree       %10jd (%.2lf%%)\n",
 124                         (intmax_t)usedbigblocks,
 125                         percent(usedbigblocks, info.bigblocks),
 126                         (intmax_t)info.rsvbigblocks,
 127                         percent(info.rsvbigblocks, info.bigblocks),
 128                         (intmax_t)(info.freebigblocks - info.rsvbigblocks),
 129                         percent(info.freebigblocks - info.rsvbigblocks,
 130                                 info.bigblocks));
 131         fprintf(stdout, "Space information\n");
 132
 133         /* Space information */
 134         totalbytes = (info.bigblocks << HAMMER_LARGEBLOCK_BITS);
 135         usedbytes = (usedbigblocks << HAMMER_LARGEBLOCK_BITS);
 136         rsvbytes = (info.rsvbigblocks << HAMMER_LARGEBLOCK_BITS);
 137         freebytes = ((info.freebigblocks - info.rsvbigblocks)
 138             << HAMMER_LARGEBLOCK_BITS);
 139
 140         fprintf(stdout, "\tNo. Inodes %10jd\n", (intmax_t)info.inodes);
 141         humanize_number(buf, sizeof(buf)  - (totalbytes < 0 ? 0 : 1),
 142             totalbytes, "", HN_AUTOSCALE, HN_DECIMAL | HN_NOSPACE | HN_B);
 143         fprintf(stdout, "\tTotal size     %6s (%jd bytes)\n",
 144             buf, (intmax_t)totalbytes);
 145
 146         humanize_number(buf, sizeof(buf)  - (usedbytes < 0 ? 0 : 1),
 147             usedbytes, "", HN_AUTOSCALE, HN_DECIMAL | HN_NOSPACE | HN_B);
 148         fprintf(stdout, "\tUsed           %6s (%.2lf%%)\n", buf,
 149             percent(usedbytes, totalbytes));
 150
 151         humanize_number(buf, sizeof(buf)  - (rsvbytes < 0 ? 0 : 1),
 152             rsvbytes, "", HN_AUTOSCALE, HN_DECIMAL | HN_NOSPACE | HN_B);
 153         fprintf(stdout, "\tReserved       %6s (%.2lf%%)\n", buf,
 154             percent(rsvbytes, totalbytes));
 155
 156         humanize_number(buf, sizeof(buf)  - (freebytes < 0 ? 0 : 1),
 157             freebytes, "", HN_AUTOSCALE, HN_DECIMAL | HN_NOSPACE | HN_B);
 158         fprintf(stdout, "\tFree           %6s (%.2lf%%)\n", buf,
 159             percent(freebytes, totalbytes));
 160
 161         /* Pseudo-filesystem information */
 162         fprintf(stdout, "PFS information\n");
 163         fprintf(stdout, "\tPFS ID  Mode    Snaps  Mounted on\n");
 164
 165         while(pfs_id < HAMMER_MAX_PFS) {
 166                 bzero(&pfs, sizeof(pfs));
 167                 bzero(&pfs_od, sizeof(pfs_od));
 168                 pfs.pfs_id = pfs_id;
 169                 pfs.ondisk = &pfs_od;
 170                 pfs.bytes = sizeof(pfs_od);
 171                 pfs.version = HAMMER_IOC_PSEUDOFS_VERSION;
 172                 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) >= 0) {
 173                         ismaster = (pfs_od.mirror_flags & HAMMER_PFSD_SLAVE)
 174                             ? 0 : 1;
 175                         if (pfs_id == 0)
 176                                 mountedon = strdup(path);
 177                         else
 178                                 mountedon = find_pfs_mount(pfs_id,
 179                                     info.vol_fsid, ismaster);
 180
 181                         sc = count_snapshots(info.version, pfs_od.snapshots,
 182                             mountedon, &error);
 183
 184                         fprintf(stdout, "\t%6d  %-6s",
 185                             pfs_id, (ismaster ? "MASTER" : "SLAVE"));
 186
 187                         snprintf(buf, 6, "%d", sc);
 188                         fprintf(stdout, " %6s  ", (error && sc == 0) ? "-" : buf);
 189
 190                         if (mountedon)
 191                                 fprintf(stdout, "%s", mountedon);
 192                         else
 193                                 fprintf(stdout, "not mounted");
 194                         fprintf(stdout, "\n");
 195                 }
 196                 pfs_id++;
 197         }
 198
 199         free(fsid);
 200         free(mountedon);
 201 }
 202
 203 char *
 204 find_pfs_mount(int pfsid, uuid_t parentuuid, int ismaster)
 205 {
 206         struct hammer_ioc_info hi;
 207         struct statfs *mntbuf;
 208         int mntsize;
 209         int curmount;
 210         int fd;
 211         size_t  mntbufsize;
 212         char *trailstr;
 213         char *retval;
 214
 215         retval = NULL;
 216
 217         /* Do not continue if there are no mounted filesystems */
 218         mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
 219         if (mntsize <= 0)
 220                 return retval;
 221
 222         mntbufsize = (mntsize) * sizeof(struct statfs);
 223         mntbuf = malloc(mntbufsize);
 224         if (mntbuf == NULL) {
 225                 perror("show_info");
 226                 exit(EXIT_FAILURE);
 227         }
 228
 229         mntsize = getfsstat(mntbuf, (long)mntbufsize, MNT_NOWAIT);
 230         curmount = mntsize - 1;
 231
 232         asprintf(&trailstr, ":%05d", pfsid);
 233
 234         /*
 235          * Iterate all the mounted points looking for the PFS passed to
 236          * this function.
 237          */
 238         while(curmount >= 0) {
 239                 /*
 240                  * We need to avoid that PFS belonging to other HAMMER
 241                  * filesystems are showed as mounted, so we compare
 242                  * against the FSID, which is presumable to be unique.
 243                  */
 244                 bzero(&hi, sizeof(hi));
 245                 if ((fd = open(mntbuf[curmount].f_mntfromname, O_RDONLY)) < 0) {
 246                         curmount--;
 247                         continue;
 248                 }
 249
 250                 if ((ioctl(fd, HAMMERIOC_GET_INFO, &hi)) < 0) {
 251                         curmount--;
 252                         continue;
 253                 }
 254
 255                 if (strstr(mntbuf[curmount].f_mntfromname, trailstr) != NULL &&
 256                     (uuid_compare(&hi.vol_fsid, &parentuuid, NULL)) == 0) {
 257                         if (ismaster) {
 258                                 if (strstr(mntbuf[curmount].f_mntfromname,
 259                                     "@@-1") != NULL) {
 260                                         retval =
 261                                             strdup(mntbuf[curmount].f_mntonname);
 262                                         break;
 263                                 }
 264                         } else {
 265                                 if (strstr(mntbuf[curmount].f_mntfromname,
 266                                     "@@0x") != NULL ) {
 267                                         retval =
 268                                             strdup(mntbuf[curmount].f_mntonname);
 269                                         break;
 270                                 }
 271                         }
 272                 }
 273                 curmount--;
 274         }
 275         free(trailstr);
 276         return retval;
 277 }
 278
 279 double
 280 percent(int64_t value, int64_t total)
 281 {
 282         /* Avoid divide-by-zero */
 283         if (total == 0)
 284                 return 100.0;
 285
 286         return ((value * 100.0) / (double)total);
 287 }
 288
 289 u_int32_t
 290 count_snapshots(u_int32_t version, char *pfs_snapshots, char *mountedon, int *errorp)
 291 {
 292         struct hammer_ioc_snapshot snapinfo;
 293         char *snapshots_path, *fpath;
 294         struct dirent *den;
 295         struct stat st;
 296         DIR *dir;
 297         u_int32_t snapshot_count = 0;
 298         int fd;
 299
 300         bzero(&snapinfo, sizeof(struct hammer_ioc_snapshot));
 301
 302         fd = open(mountedon, O_RDONLY);
 303         if (fd < 0) {
 304                 *errorp = errno;
 305                 return 0;
 306         }
 307
 308         if (version < 3) {
 309                 /*
 310                  * old style: count the number of softlinks in the snapshots dir
 311                  */
 312                 if (pfs_snapshots[0])
 313                         snapshots_path = pfs_snapshots;
 314                 else
 315                         asprintf(&snapshots_path, "%s/snapshots", mountedon);
 316                 if ((dir = opendir(snapshots_path)) != NULL) {
 317                         while ((den = readdir(dir)) != NULL) {
 318                                 if (den->d_name[0] == '.')
 319                                         continue;
 320                                 asprintf(&fpath, "%s/%s", snapshots_path,
 321                                     den->d_name);
 322                                 if (lstat(fpath, &st) == 0 &&
 323                                     S_ISLNK(st.st_mode))
 324                                         snapshot_count++;
 325                                 free(fpath);
 326                         }
 327                         closedir(dir);
 328                 }
 329         } else {
 330                 /*
 331                  * new style: file system meta-data
 332                  */
 333                 do {
 334                         if (ioctl(fd, HAMMERIOC_GET_SNAPSHOT, &snapinfo) < 0) {
 335                                 *errorp = errno;
 336                                 return 0;
 337                         }
 338                         snapshot_count += snapinfo.count;
 339                 } while (snapinfo.head.error == 0 && snapinfo.count);
 340         }
 341         return snapshot_count;
 342 }