diff options
Diffstat (limited to 'usr.sbin/fstyp/hammer.c')
| -rw-r--r-- | usr.sbin/fstyp/hammer.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/usr.sbin/fstyp/hammer.c b/usr.sbin/fstyp/hammer.c new file mode 100644 index 000000000000..45aee42fb53a --- /dev/null +++ b/usr.sbin/fstyp/hammer.c @@ -0,0 +1,209 @@ +/*- + * Copyright (c) 2016-2019 The DragonFly Project + * Copyright (c) 2016-2019 Tomohiro Kusumi <tkusumi@netbsd.org> + * All rights reserved. + * + * This software was developed by Edward Tomasz Napierala under sponsorship + * from the FreeBSD Foundation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <err.h> +#include <assert.h> + +#include <sys/types.h> + +#include "hammer_disk.h" + +#include "fstyp.h" + +extern int fsvtyp_hammer(const char *blkdevs, char *label, size_t size); +extern int fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size); + +static hammer_volume_ondisk_t +read_ondisk(FILE *fp) +{ + hammer_volume_ondisk_t ondisk; + + ondisk = read_buf(fp, 0, sizeof(*ondisk)); + if (ondisk == NULL) + err(1, "failed to read ondisk"); + + return (ondisk); +} + +static int +test_ondisk(const hammer_volume_ondisk_t ondisk) +{ + static int count = 0; + static hammer_uuid_t fsid, fstype; + static char label[64]; + + if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME && + ondisk->vol_signature != HAMMER_FSBUF_VOLUME_REV) + return (1); + if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO) + return (2); + if (ondisk->vol_no < 0 || ondisk->vol_no > HAMMER_MAX_VOLUMES - 1) + return (3); + if (ondisk->vol_count < 1 || ondisk->vol_count > HAMMER_MAX_VOLUMES) + return (4); + + if (count == 0) { + count = ondisk->vol_count; + assert(count != 0); + memcpy(&fsid, &ondisk->vol_fsid, sizeof(fsid)); + memcpy(&fstype, &ondisk->vol_fstype, sizeof(fstype)); + strlcpy(label, ondisk->vol_label, sizeof(label)); + } else { + if (ondisk->vol_count != count) + return (5); + if (memcmp(&ondisk->vol_fsid, &fsid, sizeof(fsid))) + return (6); + if (memcmp(&ondisk->vol_fstype, &fstype, sizeof(fstype))) + return (7); + if (strcmp(ondisk->vol_label, label)) + return (8); + } + + return (0); +} + +int +fstyp_hammer(FILE *fp, char *label, size_t size) +{ + hammer_volume_ondisk_t ondisk; + int error = 1; + + ondisk = read_ondisk(fp); + if (ondisk->vol_no != HAMMER_ROOT_VOLNO) + goto fail; + if (ondisk->vol_count != 1) + goto fail; + if (test_ondisk(ondisk)) + goto fail; + + strlcpy(label, ondisk->vol_label, size); + error = 0; +fail: + free(ondisk); + return (error); +} + +static int +test_volume(const char *volpath) +{ + hammer_volume_ondisk_t ondisk; + FILE *fp; + int volno = -1; + + if ((fp = fopen(volpath, "r")) == NULL) + err(1, "failed to open %s", volpath); + + ondisk = read_ondisk(fp); + fclose(fp); + if (test_ondisk(ondisk)) + goto fail; + + volno = ondisk->vol_no; +fail: + free(ondisk); + return (volno); +} + +static int +__fsvtyp_hammer(const char *blkdevs, char *label, size_t size, int partial) +{ + hammer_volume_ondisk_t ondisk = NULL; + FILE *fp; + char *dup, *p, *volpath, x[HAMMER_MAX_VOLUMES]; + int i, volno, error = 1; + + if (!blkdevs) + goto fail; + + memset(x, 0, sizeof(x)); + dup = strdup(blkdevs); + p = dup; + + volpath = NULL; + volno = -1; + while (p) { + volpath = p; + if ((p = strchr(p, ':')) != NULL) + *p++ = '\0'; + if ((volno = test_volume(volpath)) == -1) + break; + assert(volno >= 0); + assert(volno < HAMMER_MAX_VOLUMES); + x[volno]++; + } + + if (!volpath) + err(1, "invalid path %s", blkdevs); + if ((fp = fopen(volpath, "r")) == NULL) + err(1, "failed to open %s", volpath); + ondisk = read_ondisk(fp); + fclose(fp); + + free(dup); + + if (volno == -1) + goto fail; + if (partial) + goto success; + + for (i = 0; i < HAMMER_MAX_VOLUMES; i++) + if (x[i] > 1) + goto fail; + for (i = 0; i < HAMMER_MAX_VOLUMES; i++) + if (x[i] == 0) + break; + if (ondisk->vol_count != i) + goto fail; + for (; i < HAMMER_MAX_VOLUMES; i++) + if (x[i] != 0) + goto fail; +success: + strlcpy(label, ondisk->vol_label, size); + error = 0; +fail: + free(ondisk); + return (error); +} + +int +fsvtyp_hammer(const char *blkdevs, char *label, size_t size) +{ + return (__fsvtyp_hammer(blkdevs, label, size, 0)); +} + +int +fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size) +{ + return (__fsvtyp_hammer(blkdevs, label, size, 1)); +} |