/*
 * 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_reblock.c,v 1.11 2008/07/16 00:53:48 thomas Exp $
 */

#include "hammer.h"

static void reblock_usage(int exit_code);

/*
 * reblock <filesystem> [fill_percentage] (default 100%)
 */
void
hammer_cmd_reblock(char **av, int ac, int flags)
{
        struct hammer_ioc_reblock reblock;
        const char *filesystem;
        int fd;
        int perc;

        if (TimeoutOpt > 0)
                alarm(TimeoutOpt);

        bzero(&reblock, sizeof(reblock));

        reblock.key_beg.obj_id = HAMMER_MIN_OBJID;
        reblock.key_end.obj_id = HAMMER_MAX_OBJID;
        hammer_get_cycle(&reblock.key_beg, NULL);

        reblock.head.flags = flags & HAMMER_IOC_DO_FLAGS;
        reblock.allpfs = AllPFS;
        reblock.vol_no = -1;    /* Don't select a volume */

        /*
         * Restrict the localization domain if asked to do inodes or data,
         * but not both.  Note that using INODE or MISC for localization
         * adds a limitation to reblock range of B-Tree node, if BTREE is
         * used with INODES or (DATA and/or DIRS) but not both.
         */
        switch(flags & (HAMMER_IOC_DO_INODES|HAMMER_IOC_DO_DATA|HAMMER_IOC_DO_DIRS)) {
        case HAMMER_IOC_DO_INODES:
                reblock.key_beg.localization = HAMMER_LOCALIZE_INODE;
                reblock.key_end.localization = HAMMER_LOCALIZE_INODE;
                break;
        case HAMMER_IOC_DO_DATA:
        case HAMMER_IOC_DO_DIRS:
        case HAMMER_IOC_DO_DATA | HAMMER_IOC_DO_DIRS:
                reblock.key_beg.localization = HAMMER_LOCALIZE_MISC;
                reblock.key_end.localization = HAMMER_LOCALIZE_MISC;
                break;
        default:
                reblock.key_beg.localization = HAMMER_MIN_LOCALIZATION;
                reblock.key_end.localization = HAMMER_MAX_LOCALIZATION;
                break;
        }

        if (ac == 0) {
                reblock_usage(1);
                /* not reached */
        }
        filesystem = av[0];
        if (ac == 1) {
                perc = 100;
        } else {
                perc = strtol(av[1], NULL, 0);
                if (perc < 0 || perc > 100) {
                        reblock_usage(1);
                        /* not reached */
                }
        }
        reblock.free_level = (int)((int64_t)perc *
                                   HAMMER_BIGBLOCK_SIZE / 100);
        reblock.free_level = HAMMER_BIGBLOCK_SIZE - reblock.free_level;
        if (reblock.free_level < 0)
                reblock.free_level = 0;
        printf("reblock start %016jx:%04x\nfree level %d/%d\n",
                (uintmax_t)reblock.key_beg.obj_id,
                reblock.key_beg.localization,
                reblock.free_level,
                HAMMER_BIGBLOCK_SIZE);

        fd = open(filesystem, O_RDONLY);
        if (fd < 0) {
                err(1, "Unable to open %s", filesystem);
                /* not reached */
        }
        RunningIoctl = 1;
        if (ioctl(fd, HAMMERIOC_REBLOCK, &reblock) < 0) {
                printf("Reblock %s failed: %s\n", filesystem, strerror(errno));
        } else if (reblock.head.flags & HAMMER_IOC_HEAD_INTR) {
                printf("Reblock %s interrupted by timer at %016jx:%04x\n",
                        filesystem,
                        (uintmax_t)reblock.key_cur.obj_id,
                        reblock.key_cur.localization);
                if (CyclePath)
                        hammer_set_cycle(&reblock.key_cur, 0);
        } else {
                if (CyclePath)
                        hammer_reset_cycle();
                printf("Reblock %s succeeded\n", filesystem);
        }
        RunningIoctl = 0;
        close(fd);
        printf("Reblocked:\n"
               "    %jd/%jd B-Tree nodes\n"
               "    %jd/%jd B-Tree bytes\n"
               "    %jd/%jd data elements\n"
               "    %jd/%jd data bytes\n",
               (intmax_t)reblock.btree_moves, (intmax_t)reblock.btree_count,
               (intmax_t)(reblock.btree_moves *
                       sizeof(struct hammer_node_ondisk)),
               (intmax_t)(reblock.btree_count *
                       sizeof(struct hammer_node_ondisk)),
               (intmax_t)reblock.data_moves, (intmax_t)reblock.data_count,
               (intmax_t)reblock.data_byte_moves,
               (intmax_t)reblock.data_byte_count
        );
}

static
void
reblock_usage(int exit_code)
{
        fprintf(stderr, "hammer reblock <filesystem> [fill_percentage]\n");
        fprintf(stderr, "hammer reblock-btree <filesystem> [fill_percentage]\n");
        fprintf(stderr, "hammer reblock-inodes <filesystem> [fill_percentage]\n");
        fprintf(stderr, "hammer reblock-dirs <filesystem> [fill_percentage]\n");
        fprintf(stderr, "hammer reblock-data <filesystem> [fill_percentage]\n");
        fprintf(stderr, "By default 100%% is used.\n");
        exit(exit_code);
}