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,
  42     char *pfs_snapshots, char *mountedon);
  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;
  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 = 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(fd, info.version, pfs_od.snapshots,
 182                             mountedon);
 183
 184                         fprintf(stdout, "\t%6d  %-6s %6d  ",
 185                             pfs_id, (ismaster ? "MASTER" : "SLAVE"), sc);
 186                         if (mountedon)
 187                                 fprintf(stdout, "%s", mountedon);
 188                         else
 189                                 fprintf(stdout, "not mounted");
 190                         fprintf(stdout, "\n");
 191                 }
 192                 pfs_id++;
 193         }
 194
 195         free(fsid);
 196         free(mountedon);
 197 }
 198
 199 char *
 200 find_pfs_mount(int pfsid, uuid_t parentuuid, int ismaster)
 201 {
 202         struct hammer_ioc_info hi;
 203         struct statfs *mntbuf;
 204         int mntsize;
 205         int curmount;
 206         int fd;
 207         size_t  mntbufsize;
 208         char *trailstr;
 209         char *retval;
 210
 211         retval = NULL;
 212
 213         /* Do not continue if there are no mounted filesystems */
 214         mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
 215         if (mntsize <= 0)
 216                 return retval;
 217
 218         mntbufsize = (mntsize) * sizeof(struct statfs);
 219         mntbuf = malloc(mntbufsize);
 220         if (mntbuf == NULL) {
 221                 perror("show_info");
 222                 exit(EXIT_FAILURE);
 223         }
 224
 225         mntsize = getfsstat(mntbuf, (long)mntbufsize, MNT_NOWAIT);
 226         curmount = mntsize - 1;
 227
 228         asprintf(&trailstr, ":%05d", pfsid);
 229
 230         /*
 231          * Iterate all the mounted points looking for the PFS passed to
 232          * this function.
 233          */
 234         while(curmount >= 0) {
 235                 /*
 236                  * We need to avoid that PFS belonging to other HAMMER
 237                  * filesystems are showed as mounted, so we compare
 238                  * against the FSID, which is presumable to be unique.
 239                  */
 240                 bzero(&hi, sizeof(hi));
 241                 if ((fd = open(mntbuf[curmount].f_mntfromname, O_RDONLY)) < 0) {
 242                         curmount--;
 243                         continue;
 244                 }
 245
 246                 if ((ioctl(fd, HAMMERIOC_GET_INFO, &hi)) < 0) {
 247                         curmount--;
 248                         continue;
 249                 }
 250
 251                 if (strstr(mntbuf[curmount].f_mntfromname, trailstr) != NULL &&
 252                     (uuid_compare(&hi.vol_fsid, &parentuuid, NULL)) == 0) {
 253                         if (ismaster) {
 254                                 if (strstr(mntbuf[curmount].f_mntfromname,
 255                                     "@@-1") != NULL) {
 256                                         retval =
 257                                             strdup(mntbuf[curmount].f_mntonname);
 258                                         break;
 259                                 }
 260                         } else {
 261                                 if (strstr(mntbuf[curmount].f_mntfromname,
 262                                     "@@0x") != NULL ) {
 263                                         retval =
 264                                             strdup(mntbuf[curmount].f_mntonname);
 265                                         break;
 266                                 }
 267                         }
 268                 }
 269                 curmount--;
 270         }
 271         free(trailstr);
 272         return retval;
 273 }
 274
 275 double
 276 percent(int64_t value, int64_t total)
 277 {
 278         /* Avoid divide-by-zero */
 279         if (total == 0)
 280                 return 100.0;
 281
 282         return ((value * 100.0) / (double)total);
 283 }
 284
 285 u_int32_t
 286 count_snapshots(int fd, u_int32_t version, char *pfs_snapshots, char *mountedon)
 287 {
 288         struct hammer_ioc_snapshot snapinfo;
 289         char *snapshots_path, *fpath;
 290         struct dirent *den;
 291         struct stat st;
 292         DIR *dir;
 293         u_int32_t snapshot_count = 0;
 294
 295         bzero(&snapinfo, sizeof(struct hammer_ioc_snapshot));
 296         if (version < 3) {
 297                 /*
 298                  * old style: count the number of softlinks in the snapshots dir
 299                  */
 300                 if (pfs_snapshots[0])
 301                         snapshots_path = pfs_snapshots;
 302                 else
 303                         asprintf(&snapshots_path, "%s/snapshots", mountedon);
 304                 if ((dir = opendir(snapshots_path)) != NULL) {
 305                         while ((den = readdir(dir)) != NULL) {
 306                                 if (den->d_name[0] == '.')
 307                                         continue;
 308                                 asprintf(&fpath, "%s/%s", snapshots_path,
 309                                     den->d_name);
 310                                 if (lstat(fpath, &st) == 0 &&
 311                                     S_ISLNK(st.st_mode))
 312                                         snapshot_count++;
 313                                 free(fpath);
 314                         }
 315                         closedir(dir);
 316                 }
 317         } else {
 318                 /*
 319                  * new style: file system meta-data
 320                  */
 321                 do {
 322                         if (ioctl(fd, HAMMERIOC_GET_SNAPSHOT, &snapinfo) < 0) {
 323                                 perror("count_snapshots");
 324                                 exit(EXIT_FAILURE);
 325                         }
 326                         snapshot_count += snapinfo.count;
 327                 } while (snapinfo.head.error == 0 && snapinfo.count);
 328         }
 329         return snapshot_count;
 330 }