path: root/storage/tokudb/PerconaFT/portability/file.cc

/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*======
This file is part of PerconaFT.


Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.

----------------------------------------

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License, version 3,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
======= */

#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."

#include <toku_portability.h>
#include <unistd.h>
#include <errno.h>
#include <toku_assert.h>
#include <stdio.h>
#include <string.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "memory.h"
#include "toku_time.h"
#include "toku_path.h"
#include <portability/toku_atomic.h>

toku_instr_key *tokudb_file_data_key;

static int toku_assert_on_write_enospc = 0;
static const int toku_write_enospc_sleep = 1;
static uint64_t toku_write_enospc_last_report;      // timestamp of most recent
                                                    // report to error log
static time_t   toku_write_enospc_last_time;        // timestamp of most recent ENOSPC
static uint32_t toku_write_enospc_current;          // number of threads currently blocked on ENOSPC
static uint64_t toku_write_enospc_total;            // total number of times ENOSPC was returned from an attempt to write

void toku_set_assert_on_write_enospc(int do_assert) {
    toku_assert_on_write_enospc = do_assert;
}

void toku_fs_get_write_info(time_t *enospc_last_time, uint64_t *enospc_current, uint64_t *enospc_total) {
    *enospc_last_time = toku_write_enospc_last_time;
    *enospc_current = toku_write_enospc_current;
    *enospc_total = toku_write_enospc_total;
}

//Print any necessary errors
//Return whether we should try the write again.
static void
try_again_after_handling_write_error(int fd, size_t len, ssize_t r_write) {
    int try_again = 0;

    assert(r_write < 0);
    int errno_write = get_error_errno();
    switch (errno_write) {
    case EINTR: { //The call was interrupted by a signal before any data was written; see signal(7).
	char err_msg[sizeof("Write of [] bytes to fd=[] interrupted.  Retrying.") + 20+10]; //64 bit is 20 chars, 32 bit is 10 chars
	snprintf(err_msg, sizeof(err_msg), "Write of [%" PRIu64 "] bytes to fd=[%d] interrupted.  Retrying.", (uint64_t)len, fd);
	perror(err_msg);
	fflush(stderr);
	try_again = 1;
	break;
    }
    case ENOSPC: {
        if (toku_assert_on_write_enospc) {
            char err_msg[sizeof("Failed write of [] bytes to fd=[].") + 20+10]; //64 bit is 20 chars, 32 bit is 10 chars
            snprintf(err_msg, sizeof(err_msg), "Failed write of [%" PRIu64 "] bytes to fd=[%d].", (uint64_t)len, fd);
            perror(err_msg);
            fflush(stderr);
            int out_of_disk_space = 1;
            assert(!out_of_disk_space); //Give an error message that might be useful if this is the only one that survives.
        } else {
            toku_sync_fetch_and_add(&toku_write_enospc_total, 1);
            toku_sync_fetch_and_add(&toku_write_enospc_current, 1);

            time_t tnow = time(0);
            toku_write_enospc_last_time = tnow;
            if (toku_write_enospc_last_report == 0 || tnow - toku_write_enospc_last_report >= 60) {
                toku_write_enospc_last_report = tnow;

                const int tstr_length = 26;
                char tstr[tstr_length];
                time_t t = time(0);
                ctime_r(&t, tstr);

                const int MY_MAX_PATH = 256;
                char fname[MY_MAX_PATH], symname[MY_MAX_PATH+1];
                sprintf(fname, "/proc/%d/fd/%d", getpid(), fd);
                ssize_t n = readlink(fname, symname, MY_MAX_PATH);

                if ((int)n == -1)
                    fprintf(stderr, "%.24s PerconaFT No space when writing %" PRIu64 " bytes to fd=%d ", tstr, (uint64_t) len, fd);
                else {
		    tstr[n] = 0; // readlink doesn't append a NUL to the end of the buffer.
                    fprintf(stderr, "%.24s PerconaFT No space when writing %" PRIu64 " bytes to %*s ", tstr, (uint64_t) len, (int) n, symname);
		}
                fprintf(stderr, "retry in %d second%s\n", toku_write_enospc_sleep, toku_write_enospc_sleep > 1 ? "s" : "");
                fflush(stderr);
            }
            sleep(toku_write_enospc_sleep);
            try_again = 1;
            toku_sync_fetch_and_sub(&toku_write_enospc_current, 1);
            break;
        }
    }
    default:
	break;
    }
    assert(try_again);
    errno = errno_write;
}

static ssize_t (*t_write)(int, const void *, size_t);
static ssize_t (*t_full_write)(int, const void *, size_t);
static ssize_t (*t_pwrite)(int, const void *, size_t, off_t);
static ssize_t (*t_full_pwrite)(int, const void *, size_t, off_t);
static FILE *  (*t_fdopen)(int, const char *);
static FILE *  (*t_fopen)(const char *, const char *);
static int     (*t_open)(const char *, int, int);
static int (*t_fclose)(FILE *);
static ssize_t (*t_read)(int, void *, size_t);
static ssize_t (*t_pread)(int, void *, size_t, off_t);
static size_t (*os_fwrite_fun)(const void *, size_t, size_t, FILE *) = nullptr;

void toku_set_func_fwrite(
    size_t (*fwrite_fun)(const void *, size_t, size_t, FILE *)) {
    os_fwrite_fun = fwrite_fun;
}

void toku_set_func_write(ssize_t (*write_fun)(int, const void *, size_t)) {
    t_write = write_fun;
}

void toku_set_func_full_write (ssize_t (*write_fun)(int, const void *, size_t)) {
    t_full_write = write_fun;
}

void toku_set_func_pwrite (ssize_t (*pwrite_fun)(int, const void *, size_t, off_t)) {
    t_pwrite = pwrite_fun;
}

void toku_set_func_full_pwrite (ssize_t (*pwrite_fun)(int, const void *, size_t, off_t)) {
    t_full_pwrite = pwrite_fun;
}

void toku_set_func_fdopen(FILE * (*fdopen_fun)(int, const char *)) {
    t_fdopen = fdopen_fun;
}

void toku_set_func_fopen(FILE * (*fopen_fun)(const char *, const char *)) {
    t_fopen = fopen_fun;
}

void toku_set_func_open(int (*open_fun)(const char *, int, int)) {
    t_open = open_fun;
}

void toku_set_func_fclose(int (*fclose_fun)(FILE*)) {
    t_fclose = fclose_fun;
}

void toku_set_func_read (ssize_t (*read_fun)(int, void *, size_t)) {
    t_read = read_fun;
}

void toku_set_func_pread (ssize_t (*pread_fun)(int, void *, size_t, off_t)) {
    t_pread = pread_fun;
}

int toku_os_delete_with_source_location(const char *name,
                                        const char *src_file,
                                        uint src_line) {

    toku_io_instrumentation io_annotation;
    toku_instr_file_name_close_begin(io_annotation,
                                     *tokudb_file_data_key,
                                     toku_instr_file_op::file_delete,
                                     name,
                                     src_file,
                                     src_line);
    const int result = unlink(name);

    /* Register the result value with the instrumentation system */
    toku_instr_file_close_end(io_annotation, result);

    return result;
}

int toku_os_rename_with_source_location(const char *old_name,
                                        const char *new_name,
                                        const char *src_file,
                                        uint src_line) {
    int result;

    toku_io_instrumentation io_annotation;
    toku_instr_file_name_io_begin(io_annotation,
                                  *tokudb_file_data_key,
                                  toku_instr_file_op::file_rename,
                                  new_name,
                                  0,
                                  src_file,
                                  src_line);

    result = rename(old_name, new_name);
    /* Regsiter the result value with the instrumentation system */
    toku_instr_file_io_end(io_annotation, 0);

    return result;
}

void toku_os_full_write_with_source_location(int fd,
                                             const void *buf,
                                             size_t len,
                                             const char *src_file,
                                             uint src_line) {
    const char *bp = (const char *)buf;
    size_t bytes_written = len;

    toku_io_instrumentation io_annotation;
    toku_instr_file_io_begin(io_annotation,
                             toku_instr_file_op::file_write,
                             fd,
                             len,
                             src_file,
                             src_line);

    while (len > 0) {
        ssize_t r;
        if (t_full_write) {
            r = t_full_write(fd, bp, len);
        } else {
            r = write(fd, bp, len);
        }
        if (r > 0) {
            len           -= r;
            bp            += r;
        }
        else {
            try_again_after_handling_write_error(fd, len, r);
        }
    }
    assert(len == 0);

    /* Register the result value with the instrumentaion system */
    toku_instr_file_io_end(io_annotation, bytes_written);
}

int toku_os_write_with_source_location(int fd,
                                       const void *buf,
                                       size_t len,
                                       const char *src_file,
                                       uint src_line) {
    const char *bp = (const char *)buf;
    int result = 0;
    ssize_t r;

    size_t bytes_written = len;
    toku_io_instrumentation io_annotation;
    toku_instr_file_io_begin(io_annotation,
                             toku_instr_file_op::file_write,
                             fd,
                             len,
                             src_file,
                             src_line);

    while (len > 0) {
        if (t_write) {
            r = t_write(fd, bp, len);
        } else {
            r = write(fd, bp, len);
        }
        if (r < 0) {
            result = errno;
            break;
        }
        len -= r;
        bp += r;
    }
    /* Register the result value with the instrumentation system */
    toku_instr_file_io_end(io_annotation, bytes_written - len);

    return result;
}

void toku_os_full_pwrite_with_source_location(int fd,
                                              const void *buf,
                                              size_t len,
                                              toku_off_t off,
                                              const char *src_file,
                                              uint src_line) {
    assert(0 == ((long long)buf) % 512);
    assert((len % 512 == 0) && (off % 512) == 0);  // to make pwrite work.
    const char *bp = (const char *)buf;

    size_t bytes_written = len;
    toku_io_instrumentation io_annotation;
    toku_instr_file_io_begin(io_annotation,
                             toku_instr_file_op::file_write,
                             fd,
                             len,
                             src_file,
                             src_line);
    while (len > 0) {
        ssize_t r;
        if (t_full_pwrite) {
            r = t_full_pwrite(fd, bp, len, off);
        } else {
            r = pwrite(fd, bp, len, off);
        }
        if (r > 0) {
            len           -= r;
            bp            += r;
            off           += r;
        }
        else {
            try_again_after_handling_write_error(fd, len, r);
        }
    }
    assert(len == 0);

    /* Register the result value with the instrumentation system */
    toku_instr_file_io_end(io_annotation, bytes_written);
}

ssize_t toku_os_pwrite_with_source_location(int fd,
                                            const void *buf,
                                            size_t len,
                                            toku_off_t off,
                                            const char *src_file,
                                            uint src_line) {
    assert(0 ==
           ((long long)buf) %
               512);  // these asserts are to ensure that direct I/O will work.
    assert(0 == len % 512);
    assert(0 == off % 512);
    const char *bp = (const char *)buf;
    ssize_t result = 0;
    ssize_t r;

    size_t bytes_written = len;
    toku_io_instrumentation io_annotation;
    toku_instr_file_io_begin(io_annotation,
                             toku_instr_file_op::file_write,
                             fd,
                             len,
                             src_file,
                             src_line);
    while (len > 0) {
        r = (t_pwrite) ? t_pwrite(fd, bp, len, off) : pwrite(fd, bp, len, off);

        if (r < 0) {
            result = errno;
            break;
        }
        len           -= r;
        bp += r;
        off += r;
    }
    /* Register the result value with the instrumentation system */
    toku_instr_file_io_end(io_annotation, bytes_written - len);

    return result;
}

int toku_os_fwrite_with_source_location(const void *ptr,
                                        size_t size,
                                        size_t nmemb,
                                        TOKU_FILE *stream,
                                        const char *src_file,
                                        uint src_line) {
    int result = 0;
    size_t bytes_written;

    toku_io_instrumentation io_annotation;
    toku_instr_file_stream_io_begin(io_annotation,
                                    toku_instr_file_op::file_write,
                                    *stream,
                                    nmemb,
                                    src_file,
                                    src_line);

    if (os_fwrite_fun) {
        bytes_written = os_fwrite_fun(ptr, size, nmemb, stream->file);
    } else {
        bytes_written = fwrite(ptr, size, nmemb, stream->file);
    }

    if (bytes_written != nmemb) {
        if (os_fwrite_fun)  // if using hook to induce artificial errors (for
                            // testing) ...
            result = get_maybe_error_errno();  // ... then there is no error in
                                               // the stream, but there is one
                                               // in errno
        else
            result = ferror(stream->file);
        invariant(result != 0);  // Should we assert here?
    }
    /* Register the result value with the instrumentation system */
    toku_instr_file_io_end(io_annotation, bytes_written);

    return result;
}

int toku_os_fread_with_source_location(void *ptr,
                                       size_t size,
                                       size_t nmemb,
                                       TOKU_FILE *stream,
                                       const char *src_file,
                                       uint src_line) {
    int result = 0;
    size_t bytes_read;

    toku_io_instrumentation io_annotation;
    toku_instr_file_stream_io_begin(io_annotation,
                                    toku_instr_file_op::file_read,
                                    *stream,
                                    nmemb,
                                    src_file,
                                    src_line);

    if ((bytes_read = fread(ptr, size, nmemb, stream->file)) != nmemb) {
        if ((feof(stream->file)))
            result = EOF;
        else
            result = ferror(stream->file);
        invariant(result != 0);  // Should we assert here?
    }
    /* Register the result value with the instrumentation system */
    toku_instr_file_io_end(io_annotation, bytes_read);

    return result;
}

TOKU_FILE *toku_os_fdopen_with_source_location(int fildes,
                                               const char *mode,
                                               const char *filename,
                                               const toku_instr_key &instr_key,
                                               const char *src_file,
                                               uint src_line) {
    TOKU_FILE *XMALLOC(rval);
    if (FT_LIKELY(rval != nullptr)) {
        toku_io_instrumentation io_annotation;
        toku_instr_file_open_begin(io_annotation,
                                   instr_key,
                                   toku_instr_file_op::file_stream_open,
                                   filename,
                                   src_file,
                                   src_line);

        rval->file = (t_fdopen) ? t_fdopen(fildes, mode) : fdopen(fildes, mode);
        toku_instr_file_stream_open_end(io_annotation, *rval);

        if (FT_UNLIKELY(rval->file == nullptr)) {
            toku_free(rval);
            rval = nullptr;
        }
    }
    return rval;
}

TOKU_FILE *toku_os_fopen_with_source_location(const char *filename,
                                              const char *mode,
                                              const toku_instr_key &instr_key,
                                              const char *src_file,
                                              uint src_line) {
    TOKU_FILE *XMALLOC(rval);
    if (FT_UNLIKELY(rval == nullptr))
        return nullptr;

    toku_io_instrumentation io_annotation;
    toku_instr_file_open_begin(io_annotation,
                               instr_key,
                               toku_instr_file_op::file_stream_open,
                               filename,
                               src_file,
                               src_line);
    rval->file = t_fopen ? t_fopen(filename, mode) : fopen(filename, mode);
    /* Register the returning "file" value with the system */
    toku_instr_file_stream_open_end(io_annotation, *rval);

    if (FT_UNLIKELY(rval->file == nullptr)) {
        toku_free(rval);
        rval = nullptr;
    }
    return rval;
}

int toku_os_open_with_source_location(const char *path,
                                      int oflag,
                                      int mode,
                                      const toku_instr_key &instr_key,
                                      const char *src_file,
                                      uint src_line) {
    int fd;
    toku_io_instrumentation io_annotation;
    /* register a file open or creation depending on "oflag" */
    toku_instr_file_open_begin(
        io_annotation,
        instr_key,
        ((oflag & O_CREAT) ? toku_instr_file_op::file_create
                           : toku_instr_file_op::file_open),
        path,
        src_file,
        src_line);
    if (t_open)
        fd = t_open(path, oflag, mode);
    else
        fd = open(path, oflag, mode);

    toku_instr_file_open_end(io_annotation, fd);
    return fd;
}

int toku_os_open_direct(const char *path,
                        int oflag,
                        int mode,
                        const toku_instr_key &instr_key) {
    int rval;
#if defined(HAVE_O_DIRECT)
    rval = toku_os_open(path, oflag | O_DIRECT, mode, instr_key);
#elif defined(HAVE_F_NOCACHE)
    rval = toku_os_open(path, oflag, mode, instr_key);
    if (rval >= 0) {
        int r = fcntl(rval, F_NOCACHE, 1);
        if (r == -1) {
            perror("setting F_NOCACHE");
        }
    }
#else
# error "No direct I/O implementation found."
#endif
    return rval;
}

int toku_os_fclose_with_source_location(TOKU_FILE *stream,
                                        const char *src_file,
                                        uint src_line) {
    int rval = -1;
    if (FT_LIKELY(stream != nullptr)) {
        /* register a file stream close " */
        toku_io_instrumentation io_annotation;
        toku_instr_file_stream_close_begin(
            io_annotation,
            toku_instr_file_op::file_stream_close,
            *stream,
            src_file,
            src_line);

        if (t_fclose)
            rval = t_fclose(stream->file);
        else {  // if EINTR, retry until success
            while (rval != 0) {
                rval = fclose(stream->file);
                if (rval && (errno != EINTR))
                    break;
            }
        }
        /* Register the returning "rval" value with the system */
        toku_instr_file_close_end(io_annotation, rval);
        toku_free(stream);
        stream = nullptr;
    }
    return rval;
}

int toku_os_close_with_source_location(
    int fd,
    const char *src_file,
    uint src_line) {  // if EINTR, retry until success
    /* register the file close */
    int r = -1;

    /* register a file descriptor close " */
    toku_io_instrumentation io_annotation;
    toku_instr_file_fd_close_begin(
        io_annotation, toku_instr_file_op::file_close, fd, src_file, src_line);
    while (r != 0) {
        r = close(fd);
        if (r) {
            int rr = errno;
            if (rr != EINTR)
                printf("rr=%d (%s)\n", rr, strerror(rr));
            assert(rr == EINTR);
        }
    }

    /* Regsiter the returning value with the system */
    toku_instr_file_close_end(io_annotation, r);

    return r;
}

ssize_t toku_os_read_with_source_location(int fd,
                                          void *buf,
                                          size_t count,
                                          const char *src_file,
                                          uint src_line) {
    ssize_t bytes_read;

    toku_io_instrumentation io_annotation;
    toku_instr_file_io_begin(io_annotation,
                             toku_instr_file_op::file_read,
                             fd,
                             count,
                             src_file,
                             src_line);

    bytes_read = (t_read) ? t_read(fd, buf, count) : read(fd, buf, count);

    toku_instr_file_io_end(io_annotation, bytes_read);

    return bytes_read;
}

ssize_t inline_toku_os_pread_with_source_location(int fd,
                                                  void *buf,
                                                  size_t count,
                                                  off_t offset,
                                                  const char *src_file,
                                                  uint src_line) {
    assert(0 == ((long long)buf) % 512);
    assert(0 == count % 512);
    assert(0 == offset % 512);
    ssize_t bytes_read;

    toku_io_instrumentation io_annotation;
    toku_instr_file_io_begin(io_annotation,
                             toku_instr_file_op::file_read,
                             fd,
                             count,
                             src_file,
                             src_line);
    if (t_pread) {
        bytes_read = t_pread(fd, buf, count, offset);
    } else {
        bytes_read = pread(fd, buf, count, offset);
    }
    toku_instr_file_io_end(io_annotation, bytes_read);

    return bytes_read;
}

void toku_os_recursive_delete(const char *path) {
    char buf[TOKU_PATH_MAX + sizeof("rm -rf ")];
    strcpy(buf, "rm -rf ");
    strncat(buf, path, TOKU_PATH_MAX);
    int r = system(buf);
    assert_zero(r);
}

// fsync logic:

// t_fsync exists for testing purposes only
static int (*t_fsync)(int) = 0;
static uint64_t toku_fsync_count;
static uint64_t toku_fsync_time;
static uint64_t toku_long_fsync_threshold = 1000000;
static uint64_t toku_long_fsync_count;
static uint64_t toku_long_fsync_time;
static uint64_t toku_long_fsync_eintr_count;
static int toku_fsync_debug = 0;

void toku_set_func_fsync(int (*fsync_function)(int)) {
    t_fsync = fsync_function;
}

// keep trying if fsync fails because of EINTR
void file_fsync_internal_with_source_location(int fd,
                                              const char *src_file,
                                              uint src_line) {
    uint64_t tstart = toku_current_time_microsec();
    int r = -1;
    uint64_t eintr_count = 0;

    toku_io_instrumentation io_annotation;
    toku_instr_file_io_begin(io_annotation,
                             toku_instr_file_op::file_sync,
                             fd,
                             0,
                             src_file,
                             src_line);

    while (r != 0) {
        if (t_fsync) {
            r = t_fsync(fd);
        } else {
	    r = fsync(fd);
        }
	if (r) {
            assert(get_error_errno() == EINTR);
            eintr_count++;
	}
    }
    toku_sync_fetch_and_add(&toku_fsync_count, 1);
    uint64_t duration = toku_current_time_microsec() - tstart;
    toku_sync_fetch_and_add(&toku_fsync_time, duration);

    toku_instr_file_io_end(io_annotation, 0);

    if (duration >= toku_long_fsync_threshold) {
        toku_sync_fetch_and_add(&toku_long_fsync_count, 1);
        toku_sync_fetch_and_add(&toku_long_fsync_time, duration);
        toku_sync_fetch_and_add(&toku_long_fsync_eintr_count, eintr_count);
        if (toku_fsync_debug) {
            const int tstr_length = 26;
            char tstr[tstr_length];
            time_t t = time(0);
#if __linux__
            char fdname[256];
            snprintf(fdname, sizeof fdname, "/proc/%d/fd/%d", getpid(), fd);
            char lname[256];
            ssize_t s = readlink(fdname, lname, sizeof lname);
            if (0 < s && s < (ssize_t) sizeof lname)
                lname[s] = 0;
            fprintf(stderr, "%.24s toku_file_fsync %s fd=%d %s duration=%" PRIu64 " usec eintr=%" PRIu64 "\n", 
                    ctime_r(&t, tstr), __FUNCTION__, fd, s > 0 ? lname : "?", duration, eintr_count);
#else
            fprintf(stderr, "%.24s toku_file_fsync  %s fd=%d duration=%" PRIu64 " usec eintr=%" PRIu64 "\n", 
                    ctime_r(&t, tstr), __FUNCTION__, fd, duration, eintr_count);
#endif
            fflush(stderr);
        }
    }
}

void toku_file_fsync_without_accounting(int fd) {
    file_fsync_internal(fd);
}

void toku_fsync_dirfd_without_accounting(DIR *dir) {
    int fd = dirfd(dir);
    toku_file_fsync_without_accounting(fd);
}

int toku_fsync_dir_by_name_without_accounting(const char *dir_name) {
    int r = 0;
    DIR * dir = opendir(dir_name);
    if (!dir) {
        r = get_error_errno();
    } else {
        toku_fsync_dirfd_without_accounting(dir);
        r = closedir(dir);
        if (r != 0) {
            r = get_error_errno();
        }
    }
    return r;
}

// include fsync in scheduling accounting
void toku_file_fsync(int fd) {
    file_fsync_internal (fd);
}

// for real accounting
void toku_get_fsync_times(uint64_t *fsync_count, uint64_t *fsync_time, uint64_t *long_fsync_threshold, uint64_t *long_fsync_count, uint64_t *long_fsync_time) {
    *fsync_count = toku_fsync_count;
    *fsync_time = toku_fsync_time;
    *long_fsync_threshold = toku_long_fsync_threshold;
    *long_fsync_count = toku_long_fsync_count;
    *long_fsync_time = toku_long_fsync_time;
}

int toku_fsync_directory(const char *fname) {
    int result = 0;
    
    // extract dirname from fname
    const char *sp = strrchr(fname, '/');
    size_t len;
    char *dirname = NULL;
    if (sp) {
        resource_assert(sp >= fname);
        len = sp - fname + 1;
        MALLOC_N(len+1, dirname);
        if (dirname == NULL) {
            result = get_error_errno();
        } else {
            strncpy(dirname, fname, len);
            dirname[len] = 0;
        }
    } else {
        dirname = toku_strdup(".");
        if (dirname == NULL) {
            result = get_error_errno();
        }
    }

    if (result == 0) {
        result = toku_fsync_dir_by_name_without_accounting(dirname);
    }
    toku_free(dirname);
    return result;
}