engines/glusterfs.c

/*
 * glusterfs engine
 *
 * common Glusterfs's gfapi interface
 *
 */

#include "gfapi.h"

struct fio_option gfapi_options[] = {
    {
        .name     = "volume",
        .lname    = "Glusterfs volume",
        .type     = FIO_OPT_STR_STORE,
        .help     = "Name of the Glusterfs volume",
        .off1     = offsetof(struct gf_options, gf_vol),
        .category = FIO_OPT_C_ENGINE,
        .group    = FIO_OPT_G_GFAPI,
    },
    {
        .name     = "brick",
        .lname    = "Glusterfs brick name",
        .type     = FIO_OPT_STR_STORE,
        .help     = "Name of the Glusterfs brick to connect",
        .off1     = offsetof(struct gf_options, gf_brick),
        .category = FIO_OPT_C_ENGINE,
        .group    = FIO_OPT_G_GFAPI,
    },
    {
        .name = NULL,
    },
};

int fio_gf_setup(struct thread_data *td)
{
	int r = 0;
	struct gf_data *g = NULL;
	struct gf_options *opt = td->eo;
    struct stat sb = {0, };

	dprint(FD_IO, "fio setup\n");

	if (td->io_ops->data)
	    return 0;

	g = malloc(sizeof(struct gf_data));
	if (!g){
	    log_err("malloc failed.\n");
	    return -ENOMEM;
	}
	g->fs = NULL; g->fd = NULL; g->aio_events = NULL;

	g->fs = glfs_new (opt->gf_vol);
	if (!g->fs){
	    log_err("glfs_new failed.\n");
	    goto cleanup;
	}
	glfs_set_logging (g->fs, "/tmp/fio_gfapi.log", 7);
	/* default to tcp */
	r = glfs_set_volfile_server(g->fs, "tcp", opt->gf_brick, 0);
	if (r){
	    log_err("glfs_set_volfile_server failed.\n");
	    goto cleanup;
	}
	r = glfs_init(g->fs);
	if (r){
	    log_err("glfs_init failed. Is glusterd running on brick?\n");
	    goto cleanup;
	}
	sleep(2);
	r = glfs_lstat (g->fs, ".", &sb);
	if (r){
	    log_err("glfs_lstat failed.\n");
	    goto cleanup;
	}
	dprint(FD_FILE, "fio setup %p\n", g->fs);
	td->io_ops->data = g;
cleanup:
	if (r){
	    if (g){
            if (g->fs){
                glfs_fini(g->fs);
            }
            free(g);
            td->io_ops->data = NULL;
	    }
	}
	return r;
}

void fio_gf_cleanup(struct thread_data *td)
{
	struct gf_data *g = td->io_ops->data;

	if (g) {
        if (g->aio_events)
            free(g->aio_events);
        if (g->fd)
            glfs_close(g->fd);
        if (g->fs)
            glfs_fini(g->fs);
        free(g);
        td->io_ops->data = NULL;
	}
}

int fio_gf_get_file_size(struct thread_data *td, struct fio_file *f)
{
    struct stat buf;
    int ret;
    struct gf_data *g = td->io_ops->data;

    dprint(FD_FILE, "get file size %s\n", f->file_name);

    if (!g || !g->fs)
    {
        return 0;
    }
    if (fio_file_size_known(f))
        return 0;

    ret = glfs_lstat (g->fs, f->file_name, &buf);
    if (ret < 0){
        log_err("glfs_lstat failed.\n");
        return ret;
    }

    f->real_file_size = buf.st_size;
    fio_file_set_size_known(f);

    return 0;

}

int fio_gf_open_file(struct thread_data *td, struct fio_file *f)
{

    int flags = 0;
    int ret = 0;
    struct gf_data *g = td->io_ops->data;
    struct stat sb = {0, };

    if (td_write(td)) {
        if (!read_only)
            flags = O_RDWR;
    } else if (td_read(td)) {
        if (!read_only)
            flags = O_RDWR;
        else
            flags = O_RDONLY;
    }
    dprint(FD_FILE, "fio file %s open mode %s td rw %s\n", f->file_name,
           flags == O_RDONLY? "ro":"rw", td_read(td)? "read":"write");
    g->fd = glfs_creat(g->fs, f->file_name, flags, 0644);    
    if (!g->fd){
        log_err("glfs_creat failed.\n");
        ret = errno;
    }
    /* file for read doesn't exist or shorter than required, create/extend it */
    if (td_read(td)){
        if (glfs_lstat (g->fs, f->file_name, &sb) || sb.st_size < f->real_file_size){
            dprint(FD_FILE, "fio extend file %s from %ld to %ld\n", f->file_name, sb.st_size, f->real_file_size);
            ret = glfs_ftruncate (g->fd, f->real_file_size);
            if (ret){
                log_err("failed fio extend file %s to %ld\n", f->file_name, f->real_file_size);
            }else{
                unsigned long long left;
                unsigned int bs;
                char *b;
                int r;

                /* fill the file, copied from extend_file */
                b = malloc(td->o.max_bs[DDIR_WRITE]);

                left = f->real_file_size;
                while (left && !td->terminate) {
                    bs = td->o.max_bs[DDIR_WRITE];
                    if (bs > left)
                        bs = left;

                    fill_io_buffer(td, b, bs, bs);

                    r = glfs_write(g->fd, b, bs, 0);
                    dprint(FD_IO, "fio write %d of %ld file %s\n", r, f->real_file_size, f->file_name);

                    if (r > 0) {
                        left -= r;
                        continue;
                    } else {
                        if (r < 0) {
                            int __e = errno;

                            if (__e == ENOSPC) {
                                if (td->o.fill_device)
                                    break;
                                log_info("fio: ENOSPC on laying out "
                                         "file, stopping\n");
                                break;
                            }
                            td_verror(td, errno, "write");
                        } else
                            td_verror(td, EIO, "write");

                        break;
                    }
                }

                if (b) free(b);
                glfs_lseek(g->fd, 0, SEEK_SET);

                if (td->terminate) {
                    dprint(FD_FILE, "terminate unlink %s\n", f->file_name);
                    unlink(f->file_name);
                } else if (td->o.create_fsync) {
                    if (glfs_fsync(g->fd) < 0) {
                        dprint(FD_FILE, "failed to sync, close %s\n", f->file_name);
                        td_verror(td, errno, "fsync");
                        glfs_close(g->fd);
                        g->fd = NULL;
                        return 1;
                    }
                }
            }
        }
    }
    dprint(FD_FILE, "fio %p created %s\n", g->fs, f->file_name);
    f->fd = -1;
    f->shadow_fd = -1;    

    return ret;
}

int fio_gf_close_file(struct thread_data *td, struct fio_file *f)
{
	int ret = 0;
	struct gf_data *g = td->io_ops->data;

	dprint(FD_FILE, "fd close %s\n", f->file_name);

    if (g){
        if (g->fd && glfs_close(g->fd) < 0)
            ret = errno;

        if (g->fs)
            glfs_fini(g->fs);

        g->fd = NULL;
        free(g);
    }
	td->io_ops->data = NULL;
	f->engine_data = 0;

	return ret;
}