i386 removal, part 54/x: Remove perfmon(4) remains.

[dragonfly.git] / sbin / hammer / cmd_pfs.c

/*
 * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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.
 *
 * $DragonFly: src/sbin/hammer/cmd_pseudofs.c,v 1.12 2008/10/08 21:01:54 thomas Exp $
 */

#include <libgen.h>

#include "hammer.h"

static int scanpfsid(struct hammer_ioc_pseudofs_rw *pfs, const char *path);
static void parse_pfsd_options(char **av, int ac, hammer_pseudofs_data_t pfsd);
static void init_pfsd(hammer_pseudofs_data_t pfsd, int is_slave);
static void pseudofs_usage(int code);
static int timetosecs(char *str);

/*
 * Return a directory that contains path.
 * If '/' is not found in the path then '.' is returned.
 * A caller need to free the returned pointer.
 */
static char*
getdir(const char *path)
{
        char *dirpath;

        dirpath = strdup(path);
        if (strrchr(dirpath, '/')) {
                *strrchr(dirpath, '/') = 0;
                if (strlen(dirpath) == 0) {
                        free(dirpath);
                        dirpath = strdup("/");
                }
        } else {
                free(dirpath);
                dirpath = strdup(".");
        }

        return(dirpath);
}

/*
 * Calculate the pfs_id given a path to a directory or a @@PFS or @@%llx:%d
 * softlink.
 */
int
getpfs(struct hammer_ioc_pseudofs_rw *pfs, char *path)
{
        int fd;
        char *p;

        bzero(pfs, sizeof(*pfs));
        pfs->ondisk = malloc(sizeof(*pfs->ondisk));
        bzero(pfs->ondisk, sizeof(*pfs->ondisk));
        pfs->bytes = sizeof(*pfs->ondisk);

        /*
         * Trailing '/' must be removed so that upon pfs-destroy
         * the symlink can be deleted without problems.
         * Root directory (/) must be excluded from this.
         */
        p = path + (int)strlen(path) - 1;
        assert(p >= path);
        while (p != path && *p == '/')
                *p-- = 0;

        fd = scanpfsid(pfs, path);
        if (fd < 0) {
                /*
                 * Once it comes here the hammer command may fail even if
                 * this function returns valid file descriptor.
                 */
                fd = open(path, O_RDONLY);
                if (fd >= 0) {
                        pfs->pfs_id = -1;
                        ioctl(fd, HAMMERIOC_GET_PSEUDOFS, pfs);
                        if (pfs->pfs_id == -1) {
                                close(fd);
                                fd = -1;
                        }
                }
        }

        if (fd < 0) {
                fprintf(stderr, "Cannot access PFS %s: %s\n",
                        path, strerror(errno));
                exit(1);
        }

        /*
         * pfs.pfs_id should have been set to non -1.  In this case fd
         * could be any fd of HAMMER inodes since HAMMERIOC_GET_PSEUDOFS
         * doesn't depend on inode attributes if it's set to a valid id.
         */
        if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, pfs) < 0) {
                fprintf(stderr, "Cannot access PFS %s: %s\n",
                        path, strerror(errno));
                exit(1);
        }
        return(fd);
}

/*
 * Extract the PFS id from path.  Return a file descriptor of
 * the parent directory which is expected to be located under
 * the root filesystem (not another PFS).
 */
static int
scanpfsid(struct hammer_ioc_pseudofs_rw *pfs, const char *path)
{
        int fd;
        int n;
        const char *p;
        char *dirpath;
        char buf[64];
        uintmax_t dummy_tid;
        struct stat st;

        if (stat(path, &st)) {
                /* possibly slave PFS */
        } else if (S_ISDIR(st.st_mode)) {
                /* possibly master or slave PFS */
        } else {
                return -1;  /* neither */
        }

        /*
         * If the path is a link read the link.
         */
        if (lstat(path, &st) == 0 && S_ISLNK(st.st_mode)) {
                n = readlink(path, buf, sizeof(buf) - 1);
                if (n < 0)
                        n = 0;
                buf[n] = 0;
                p = buf;
        } else {
                p = path;
        }

        /*
         * The symlink created by pfs-master|slave is just a symlink.
         * One could happen to remove a symlink and relink PFS as
         * # ln -s ./@@-1:00001 ./link
         * which results PFS having something extra before @@.
         * One could also directly use the PFS and results the same.
         * Get rid of it before we extract the PFS id.
         */
        if (strchr(p, '/')) {
                p = basename(p);
                if (p == NULL)
                        err(1, "basename");
        }

        /*
         * Extract the PFS from the link.  HAMMER will automatically
         * convert @@PFS%05d links so if actually see one in that
         * form the target PFS may not exist or may be corrupt.  But
         * we can extract the PFS id anyway.
         */
        dirpath = getdir(path);
        if (sscanf(p, "@@PFS%d", &pfs->pfs_id) == 1) {
                fd = open(dirpath, O_RDONLY);
        } else if (sscanf(p, "@@%jx:%d", &dummy_tid, &pfs->pfs_id) == 2) {
                fd = open(dirpath, O_RDONLY);
        } else {
                fd = -1;  /* Failed to scan PFS id */
        }
        free(dirpath);
        return(fd);
}

void
relpfs(int fd, struct hammer_ioc_pseudofs_rw *pfs)
{
        if (fd >= 0)
                close(fd);
        if (pfs->ondisk) {
                free(pfs->ondisk);
                pfs->ondisk = NULL;
        }
}

void
hammer_cmd_pseudofs_status(char **av, int ac)
{
        struct hammer_ioc_pseudofs_rw pfs;
        int i;
        int fd;

        if (ac == 0)
                pseudofs_usage(1);

        for (i = 0; i < ac; ++i) {
                fd = getpfs(&pfs, av[i]);
                printf("%s\t", av[i]);
                if (fd < 0 || ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0) {
                        printf("Invalid PFS path %s\n", av[i]);
                } else {
                        printf("PFS #%d {\n", pfs.pfs_id);
                        dump_pfsd(pfs.ondisk, fd);
                        printf("}\n");
                }
                if (fd >= 0)
                        close(fd);
                if (pfs.ondisk)
                        free(pfs.ondisk);
                relpfs(fd, &pfs);
        }
}

void
hammer_cmd_pseudofs_create(char **av, int ac, int is_slave)
{
        struct hammer_ioc_pseudofs_rw pfs;
        struct hammer_pseudofs_data pfsd;
        struct stat st;
        const char *path;
        char *dirpath;
        char *linkpath;
        int pfs_id;
        int fd;
        int error;

        if (ac == 0)
                pseudofs_usage(1);
        path = av[0];
        if (lstat(path, &st) == 0) {
                fprintf(stderr, "Cannot create %s, file exists!\n", path);
                exit(1);
        }

        /*
         * Figure out the directory prefix, taking care of degenerate
         * cases.
         */
        dirpath = getdir(path);
        fd = open(dirpath, O_RDONLY);
        if (fd < 0) {
                fprintf(stderr, "Cannot open directory %s\n", dirpath);
                exit(1);
        }

        /*
         * Avoid foot-shooting.  Don't let the user create a PFS
         * softlink via a PFS.  PFS softlinks may only be accessed
         * via the master filesystem.  Checking it here ensures
         * other PFS commands access PFS under the master filesystem.
         */
        bzero(&pfs, sizeof(pfs));
        bzero(&pfsd, sizeof(pfsd));
        pfs.pfs_id = -1;
        pfs.ondisk = &pfsd;
        pfs.bytes = sizeof(pfsd);

        ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs);
        if (pfs.pfs_id != HAMMER_ROOT_PFSID) {
                fprintf(stderr,
                        "You are attempting to access a PFS softlink "
                        "from a PFS.  It may not represent the PFS\n"
                        "on the main filesystem mount that you "
                        "expect!  You may only access PFS softlinks\n"
                        "via the main filesystem mount!\n");
                exit(1);
        }

        error = 0;
        for (pfs_id = 0; pfs_id < HAMMER_MAX_PFS; ++pfs_id) {
                bzero(&pfs, sizeof(pfs));
                bzero(&pfsd, sizeof(pfsd));
                pfs.pfs_id = pfs_id;
                pfs.ondisk = &pfsd;
                pfs.bytes = sizeof(pfsd);
                pfs.version = HAMMER_IOC_PSEUDOFS_VERSION;
                if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) < 0) {
                        error = errno;
                        break;
                }
        }
        if (pfs_id == HAMMER_MAX_PFS) {
                fprintf(stderr, "Cannot create %s, all PFSs in use\n", path);
                exit(1);
        } else if (pfs_id == HAMMER_ROOT_PFSID) {
                fprintf(stderr, "Fatal error: PFS#%d must exist\n",
                        HAMMER_ROOT_PFSID);
                exit(1);
        }

        if (error != ENOENT) {
                fprintf(stderr, "Cannot create %s, got %s during scan\n",
                        path, strerror(error));
                exit(1);
        }

        /*
         * Create the new PFS
         */
        printf("Creating PFS #%d\t", pfs_id);
        init_pfsd(&pfsd, is_slave);
        pfs.pfs_id = pfs_id;
        pfs.ondisk = &pfsd;
        pfs.bytes = sizeof(pfsd);
        pfs.version = HAMMER_IOC_PSEUDOFS_VERSION;

        if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) < 0) {
                printf("failed: %s\n", strerror(errno));
        } else {
                /* special symlink, must be exactly 10 characters */
                asprintf(&linkpath, "@@PFS%05d", pfs_id);
                if (symlink(linkpath, path) < 0) {
                        printf("failed: cannot create symlink: %s\n",
                                strerror(errno));
                } else {
                        printf("succeeded!\n");
                        hammer_cmd_pseudofs_update(av, ac);
                }
        }
        free(dirpath);
        close(fd);
}

void
hammer_cmd_pseudofs_destroy(char **av, int ac)
{
        struct hammer_ioc_pseudofs_rw pfs;
        struct hammer_pseudofs_data pfsd;
        struct stat st;
        int fd;
        int i;

        if (ac == 0)
                pseudofs_usage(1);
        fd = getpfs(&pfs, av[0]);

        if (pfs.pfs_id == HAMMER_ROOT_PFSID) {
                fprintf(stderr, "You cannot destroy PFS#0\n");
                exit(1);
        }
        printf("You have requested that PFS#%d (%s) be destroyed\n",
                pfs.pfs_id, pfs.ondisk->label);
        printf("This will irrevocably destroy all data on this PFS!!!!!\n");
        printf("Do you really want to do this? ");
        fflush(stdout);
        if (getyn() == 0) {
                fprintf(stderr, "No action taken on PFS#%d\n", pfs.pfs_id);
                exit(1);
        }

        if (hammer_is_pfs_master(pfs.ondisk)) {
                printf("This PFS is currently setup as a MASTER!\n");
                printf("Are you absolutely sure you want to destroy it? ");
                fflush(stdout);
                if (getyn() == 0) {
                        fprintf(stderr, "No action taken on PFS#%d\n",
                                pfs.pfs_id);
                        exit(1);
                }
        }

        printf("Destroying PFS #%d (%s) in ", pfs.pfs_id, pfs.ondisk->label);
        for (i = 5; i; --i) {
                printf(" %d", i);
                fflush(stdout);
                sleep(1);
        }
        printf(".. starting destruction pass\n");
        fflush(stdout);

        /*
         * Save the original PFS data so we can restore if on failure.
         * It fails to destroy, for example, if the PFS is still mounted.
         */
        bcopy(pfs.ondisk, &pfsd, sizeof(pfsd));

        /*
         * Set the sync_beg_tid and sync_end_tid's to 1, once we start the
         * RMR the PFS is basically destroyed even if someone ^C's it.
         */
        pfs.ondisk->mirror_flags |= HAMMER_PFSD_SLAVE;
        pfs.ondisk->reserved01 = -1;
        pfs.ondisk->sync_beg_tid = 1;
        pfs.ondisk->sync_end_tid = 1;

        if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) < 0) {
                fprintf(stderr, "Unable to update the PFS configuration: %s\n",
                        strerror(errno));
                exit(1);
        }

        /*
         * Ok, do it.  Remove the softlink on success.
         */
        if (ioctl(fd, HAMMERIOC_RMR_PSEUDOFS, &pfs) == 0) {
                printf("pfs-destroy of PFS#%d succeeded!\n", pfs.pfs_id);
                if (lstat(av[0], &st) == 0 && S_ISLNK(st.st_mode)) {
                        if (remove(av[0]) < 0) {
                                fprintf(stderr, "Unable to remove softlink: %s "
                                        "(but the PFS has been destroyed)\n",
                                        av[0]);
                                /* exit status 0 anyway */
                        }
                }
        } else {
                printf("pfs-destroy of PFS#%d failed: %s\n",
                        pfs.pfs_id, strerror(errno));
                /*
                 * Restore the pfsd as we don't want to keep it downgraded.
                 * This simply restores ondisk PFS with the original data
                 * without creating a new root inode as it already exists.
                 */
                bcopy(&pfsd, pfs.ondisk, sizeof(pfsd));
                if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) < 0) {
                        printf("Failed to restore the original PFS#%d data\n",
                                pfs.pfs_id);
                        exit(1);
                }
        }
        relpfs(fd, &pfs);
}

void
hammer_cmd_pseudofs_upgrade(char **av, int ac)
{
        struct hammer_ioc_pseudofs_rw pfs;
        int fd;

        if (ac == 0)
                pseudofs_usage(1);
        fd = getpfs(&pfs, av[0]);

        if (pfs.pfs_id == HAMMER_ROOT_PFSID) {
                fprintf(stderr, "You cannot upgrade PFS#0"
                                " (It should already be a master)\n");
                exit(1);
        } else if (hammer_is_pfs_master(pfs.ondisk)) {
                printf("It is already a master\n");
                exit(1);
        }

        if (ioctl(fd, HAMMERIOC_UPG_PSEUDOFS, &pfs) == 0) {
                printf("pfs-upgrade of PFS#%d (%s) succeeded\n",
                        pfs.pfs_id, pfs.ondisk->label);
        } else {
                fprintf(stderr, "pfs-upgrade of PFS#%d (%s) failed: %s\n",
                        pfs.pfs_id, pfs.ondisk->label, strerror(errno));
        }
        relpfs(fd, &pfs);
}

void
hammer_cmd_pseudofs_downgrade(char **av, int ac)
{
        struct hammer_ioc_pseudofs_rw pfs;
        int fd;

        if (ac == 0)
                pseudofs_usage(1);
        fd = getpfs(&pfs, av[0]);

        if (pfs.pfs_id == HAMMER_ROOT_PFSID) {
                fprintf(stderr, "You cannot downgrade PFS#0\n");
                exit(1);
        } else if (hammer_is_pfs_slave(pfs.ondisk)) {
                printf("It is already a slave\n");
                exit(1);
        }

        if (ioctl(fd, HAMMERIOC_DGD_PSEUDOFS, &pfs) == 0) {
                printf("pfs-downgrade of PFS#%d (%s) succeeded\n",
                        pfs.pfs_id, pfs.ondisk->label);
        } else {
                fprintf(stderr, "pfs-downgrade of PFS#%d (%s) failed: %s\n",
                        pfs.pfs_id, pfs.ondisk->label, strerror(errno));
        }
        relpfs(fd, &pfs);
}

void
hammer_cmd_pseudofs_update(char **av, int ac)
{
        struct hammer_ioc_pseudofs_rw pfs;
        int fd;

        if (ac == 0)
                pseudofs_usage(1);
        fd = getpfs(&pfs, av[0]);

        printf("%s\n", av[0]);
        fflush(stdout);

        if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) == 0) {
                parse_pfsd_options(av + 1, ac - 1, pfs.ondisk);
                if (hammer_is_pfs_slave(pfs.ondisk) &&
                    pfs.pfs_id == HAMMER_ROOT_PFSID) {
                        printf("The real mount point cannot be made a PFS "
                               "slave, only PFS sub-directories can be made "
                               "slaves\n");
                        exit(1);
                }
                pfs.bytes = sizeof(*pfs.ondisk);
                if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) == 0) {
                        if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) == 0) {
                                dump_pfsd(pfs.ondisk, fd);
                        } else {
                                printf("Unable to retrieve PFS configuration "
                                        "after successful update: %s\n",
                                        strerror(errno));
                                exit(1);
                        }
                } else {
                        printf("Unable to adjust PFS configuration: %s\n",
                                strerror(errno));
                        exit(1);
                }
        }
        relpfs(fd, &pfs);
}

static void
init_pfsd(hammer_pseudofs_data_t pfsd, int is_slave)
{
        uint32_t status;

        bzero(pfsd, sizeof(*pfsd));
        pfsd->sync_beg_tid = 1;
        pfsd->sync_end_tid = 1;
        pfsd->sync_beg_ts = 0;
        pfsd->sync_end_ts = 0;
        uuid_create(&pfsd->shared_uuid, &status);
        uuid_create(&pfsd->unique_uuid, &status);
        if (is_slave)
                pfsd->mirror_flags |= HAMMER_PFSD_SLAVE;
}

void
dump_pfsd(hammer_pseudofs_data_t pfsd, int fd)
{
        struct hammer_ioc_version       version;
        uint32_t status;
        char *str = NULL;

        printf("    sync-beg-tid=0x%016jx\n", (uintmax_t)pfsd->sync_beg_tid);
        printf("    sync-end-tid=0x%016jx\n", (uintmax_t)pfsd->sync_end_tid);
        uuid_to_string(&pfsd->shared_uuid, &str, &status);
        printf("    shared-uuid=%s\n", str);
        free(str);
        uuid_to_string(&pfsd->unique_uuid, &str, &status);
        printf("    unique-uuid=%s\n", str);
        free(str);
        printf("    label=\"%s\"\n", pfsd->label);
        if (pfsd->snapshots[0])
                printf("    snapshots=\"%s\"\n", pfsd->snapshots);
        if (pfsd->prune_min < (60 * 60 * 24)) {
                printf("    prune-min=%02d:%02d:%02d\n",
                        pfsd->prune_min / 60 / 60 % 24,
                        pfsd->prune_min / 60 % 60,
                        pfsd->prune_min % 60);
        } else if (pfsd->prune_min % (60 * 60 * 24)) {
                printf("    prune-min=%dd/%02d:%02d:%02d\n",
                        pfsd->prune_min / 60 / 60 / 24,
                        pfsd->prune_min / 60 / 60 % 24,
                        pfsd->prune_min / 60 % 60,
                        pfsd->prune_min % 60);
        } else {
                printf("    prune-min=%dd\n", pfsd->prune_min / 60 / 60 / 24);
        }

        if (hammer_is_pfs_slave(pfsd)) {
                printf("    operating as a SLAVE\n");
        } else {
                printf("    operating as a MASTER\n");
        }

        /*
         * Snapshots directory cannot be shown when there is no fd since
         * hammer version can't be retrieved. mirror-dump passes -1 because
         * its input came from mirror-read output thus no path is available
         * to open(2).
         */
        if (fd >= 0 && pfsd->snapshots[0] == 0) {
                bzero(&version, sizeof(version));
                if (ioctl(fd, HAMMERIOC_GET_VERSION, &version) < 0)
                        return;
                if (version.cur_version < 3) {
                        if (hammer_is_pfs_slave(pfsd)) {
                                printf("    snapshots directory not set for "
                                       "slave\n");
                        } else {
                                printf("    snapshots directory for master "
                                       "defaults to <pfs>/snapshots\n");
                        }
                } else {
                        printf("    snapshots directory defaults to "
                               "/var/hammer/<pfs>\n");
                }
        }
}

static void
parse_pfsd_options(char **av, int ac, hammer_pseudofs_data_t pfsd)
{
        char *cmd;
        char *ptr;
        int len;
        uint32_t status;

        while (ac) {
                cmd = *av;
                if ((ptr = strchr(cmd, '=')) != NULL)
                        *ptr++ = 0;

                /*
                 * Basic assignment value test
                 */
                if (ptr == NULL) {
                        fprintf(stderr,
                                "option %s requires an assignment\n",
                                cmd);
                        exit(1);
                }

                status = uuid_s_ok;
                if (strcmp(cmd, "sync-beg-tid") == 0) {
                        pfsd->sync_beg_tid = strtoull(ptr, NULL, 16);
                } else if (strcmp(cmd, "sync-end-tid") == 0) {
                        pfsd->sync_end_tid = strtoull(ptr, NULL, 16);
                } else if (strcmp(cmd, "shared-uuid") == 0) {
                        uuid_from_string(ptr, &pfsd->shared_uuid, &status);
                } else if (strcmp(cmd, "unique-uuid") == 0) {
                        uuid_from_string(ptr, &pfsd->unique_uuid, &status);
                } else if (strcmp(cmd, "label") == 0) {
                        len = strlen(ptr);
                        if (ptr[0] == '"' && ptr[len-1] == '"') {
                                ptr[len-1] = 0;
                                ++ptr;
                        } else if (ptr[0] == '"') {
                                fprintf(stderr,
                                        "option %s: malformed string\n",
                                        cmd);
                                exit(1);
                        }
                        snprintf(pfsd->label, sizeof(pfsd->label), "%s", ptr);
                } else if (strcmp(cmd, "snapshots") == 0) {
                        len = strlen(ptr);
                        if (ptr[0] != '/') {
                                fprintf(stderr,
                                        "option %s: '%s' must be an "
                                        "absolute path\n", cmd, ptr);
                                if (ptr[0] == 0) {
                                        fprintf(stderr,
                                                "use 'snapshots-clear' "
                                                "to unset snapshots dir\n");
                                }
                                exit(1);
                        }
                        if (len >= (int)sizeof(pfsd->snapshots)) {
                                fprintf(stderr,
                                        "option %s: path too long, %d "
                                        "character limit\n", cmd, len);
                                exit(1);
                        }
                        snprintf(pfsd->snapshots, sizeof(pfsd->snapshots),
                                 "%s", ptr);
                } else if (strcmp(cmd, "snapshots-clear") == 0) {
                        pfsd->snapshots[0] = 0;
                } else if (strcmp(cmd, "prune-min") == 0) {
                        pfsd->prune_min = timetosecs(ptr);
                        if (pfsd->prune_min < 0) {
                                fprintf(stderr,
                                        "option %s: illegal time spec, "
                                        "use Nd or [Nd/]hh[:mm[:ss]]\n", ptr);
                                exit(1);
                        }
                } else {
                        fprintf(stderr, "invalid option: %s\n", cmd);
                        exit(1);
                }
                if (status != uuid_s_ok) {
                        fprintf(stderr, "option %s: error parsing uuid %s\n",
                                cmd, ptr);
                        exit(1);
                }
                --ac;
                ++av;
        }
}

static
void
pseudofs_usage(int code)
{
        fprintf(stderr,
                "hammer pfs-status <dirpath> ...\n"
                "hammer pfs-master <dirpath> [options]\n"
                "hammer pfs-slave <dirpath> [options]\n"
                "hammer pfs-update <dirpath> [options]\n"
                "hammer pfs-upgrade <dirpath>\n"
                "hammer pfs-downgrade <dirpath>\n"
                "hammer pfs-destroy <dirpath>\n"
                "\n"
                "options:\n"
                "    sync-beg-tid=0x16llx\n"
                "    sync-end-tid=0x16llx\n"
                "    shared-uuid=0x16llx\n"
                "    unique-uuid=0x16llx\n"
                "    label=\"string\"\n"
                "    snapshots=\"/path\"\n"
                "    snapshots-clear\n"
                "    prune-min=Nd\n"
                "    prune-min=[Nd/]hh[:mm[:ss]]\n"
        );
        exit(code);
}

/*
 * Convert time in the form [Nd/]hh[:mm[:ss]] to seconds.
 *
 * Return -1 if a parse error occurs.
 * Return 0x7FFFFFFF if the time exceeds the maximum allowed.
 */
static
int
timetosecs(char *str)
{
        int days = 0;
        int hrs = 0;
        int mins = 0;
        int secs = 0;
        int n;
        long long v;
        char *ptr;

        n = strtol(str, &ptr, 10);
        if (n < 0)
                return(-1);
        if (*ptr == 'd') {
                days = n;
                ++ptr;
                if (*ptr == '/')
                    n = strtol(ptr + 1, &ptr, 10);
                else
                    n = 0;
        }
        if (n < 0)
                return(-1);
        hrs = n;
        if (*ptr == ':') {
                n = strtol(ptr + 1, &ptr, 10);
                if (n < 0)
                        return(-1);
                mins = n;
                if (*ptr == ':') {
                        n = strtol(ptr + 1, &ptr, 10);
                        if (n < 0)
                                return(-1);
                        secs = n;
                }
        }
        if (*ptr)
                return(-1);
        v = days * 24 * 60 * 60 + hrs *  60 * 60 + mins * 60 + secs;
        if (v > 0x7FFFFFFF)
                v = 0x7FFFFFFF;
        return((int)v);
}