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#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <glusterfs/api/glfs.h>
#include <glusterfs/api/glfs-handles.h>

enum fallocate_flag {
    TEST_FALLOCATE_NONE,
    TEST_FALLOCATE_KEEP_SIZE,
    TEST_FALLOCATE_ZERO_RANGE,
    TEST_FALLOCATE_PUNCH_HOLE,
    TEST_FALLOCATE_MAX,
};

int
get_fallocate_flag(int opcode)
{
    int ret = 0;

    switch (opcode) {
        case TEST_FALLOCATE_NONE:
            ret = 0;
            break;
        case TEST_FALLOCATE_KEEP_SIZE:
            ret = FALLOC_FL_KEEP_SIZE;
            break;
        case TEST_FALLOCATE_ZERO_RANGE:
            ret = FALLOC_FL_ZERO_RANGE;
            break;
        case TEST_FALLOCATE_PUNCH_HOLE:
            ret = FALLOC_FL_PUNCH_HOLE;
            break;
        default:
            ret = -1;
            break;
    }
    return ret;
}

int
main(int argc, char *argv[])
{
    int ret = 1;
    int opcode = -1;
    off_t offset = 0;
    size_t len = 0;
    glfs_t *fs = NULL;
    glfs_fd_t *fd = NULL;

    if (argc != 8) {
        fprintf(stderr,
                "Syntax: %s <host> <volname> <opcode> <offset> <len> "
                "<file-path> <log-file>\n",
                argv[0]);
        return 1;
    }

    fs = glfs_new(argv[2]);
    if (!fs) {
        fprintf(stderr, "glfs_new: returned NULL\n");
        return 1;
    }

    ret = glfs_set_volfile_server(fs, "tcp", argv[1], 24007);
    if (ret != 0) {
        fprintf(stderr, "glfs_set_volfile_server: returned %d\n", ret);
        goto out;
    }

    ret = glfs_set_logging(fs, argv[7], 7);
    if (ret != 0) {
        fprintf(stderr, "glfs_set_logging: returned %d\n", ret);
        goto out;
    }

    ret = glfs_init(fs);
    if (ret != 0) {
        fprintf(stderr, "glfs_init: returned %d\n", ret);
        goto out;
    }

    opcode = atoi(argv[3]);
    opcode = get_fallocate_flag(opcode);
    if (opcode < 0) {
        fprintf(stderr, "get_fallocate_flag: invalid flag \n");
        goto out;
    }

    offset = atoi(argv[4]);
    len = atoi(argv[5]);

    fd = glfs_open(fs, argv[6], O_RDWR);
    if (fd == NULL) {
        fprintf(stderr, "glfs_open: returned NULL\n");
        goto out;
    }

    ret = glfs_fallocate(fd, opcode, offset, len);
    if (ret <= 0) {
        fprintf(stderr, "glfs_fallocate: returned %d\n", ret);
        goto out;
    }

    ret = 0;

out:
    if (fd)
        glfs_close(fd);
    glfs_fini(fs);
    return ret;
}