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https://github.com/MariaDB/server.git
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127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/* -*- mode: C; c-basic-offset: 4 -*- */
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#include <toku_portability.h>
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#include <toku_atomic.h>
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#include <unistd.h>
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#include <errno.h>
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#include <toku_assert.h>
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#include <stdio.h>
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//Print any necessary errors
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//Return whether we should try the write again.
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static int
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try_again_after_handling_write_error(int fd, size_t len, ssize_t r_write) {
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int try_again = 0;
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if (r_write==-1) {
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int errno_write = errno;
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assert(errno_write != 0);
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switch (errno_write) {
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case EINTR: { //The call was interrupted by a signal before any data was written; see signal(7).
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char err_msg[sizeof("Write of [] bytes to fd=[] interrupted. Retrying.") + 20+10]; //64 bit is 20 chars, 32 bit is 10 chars
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snprintf(err_msg, sizeof(err_msg), "Write of [%"PRIu64"] bytes to fd=[%d] interrupted. Retrying.", (uint64_t)len, fd);
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perror(err_msg);
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fflush(stderr);
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try_again = 1;
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break;
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}
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case ENOSPC: {
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char err_msg[sizeof("Failed write of [] bytes to fd=[].") + 20+10]; //64 bit is 20 chars, 32 bit is 10 chars
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snprintf(err_msg, sizeof(err_msg), "Failed write of [%"PRIu64"] bytes to fd=[%d].", (uint64_t)len, fd);
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perror(err_msg);
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fflush(stderr);
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int out_of_disk_space = 1;
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assert(!out_of_disk_space); //Give an error message that might be useful if this is the only one that survives.
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}
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default:
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break;
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}
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errno = errno_write;
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}
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return try_again;
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}
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static ssize_t (*t_pwrite)(int, const void *, size_t, off_t) = 0;
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int
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toku_set_func_pwrite (ssize_t (*pwrite_fun)(int, const void *, size_t, off_t)) {
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t_pwrite = pwrite_fun;
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return 0;
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}
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void
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toku_os_full_pwrite (int fd, const void *buf, size_t len, off_t off) {
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ssize_t r;
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again:
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if (t_pwrite) {
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r = t_pwrite(fd, buf, len, off);
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} else {
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r = pwrite(fd, buf, len, off);
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}
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if (try_again_after_handling_write_error(fd, len, r))
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goto again;
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assert(r==(ssize_t)len);
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}
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static ssize_t (*t_write)(int, const void *, size_t) = 0;
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int
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toku_set_func_write (ssize_t (*write_fun)(int, const void *, size_t)) {
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t_write = write_fun;
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return 0;
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}
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void
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toku_os_full_write (int fd, const void *buf, size_t len) {
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ssize_t r;
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again:
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if (t_write) {
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r = t_write(fd, buf, len);
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} else {
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r = write(fd, buf, len);
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}
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if (try_again_after_handling_write_error(fd, len, r))
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goto again;
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assert(r==(ssize_t)len);
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}
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static uint64_t get_tnow(void) {
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struct timeval tv;
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int r = gettimeofday(&tv, NULL); assert(r == 0);
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return tv.tv_sec * 1000000ULL + tv.tv_usec;
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}
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// t_fsync exists for testing purposes only
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static int (*t_fsync)(int) = 0;
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static uint64_t toku_fsync_count;
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static uint64_t toku_fsync_time;
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int
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toku_set_func_fsync(int (*fsync_function)(int)) {
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t_fsync = fsync_function;
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return 0;
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}
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// keep trying if fsync fails because of EINTR
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int
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toku_file_fsync(int fd) {
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int r = -1;
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uint64_t tstart = get_tnow();
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while (r != 0) {
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if (t_fsync)
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r = t_fsync(fd);
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else
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r = fsync(fd);
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if (r)
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assert(errno==EINTR);
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}
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toku_sync_fetch_and_add_uint64(&toku_fsync_count, 1);
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toku_sync_fetch_and_add_uint64(&toku_fsync_time, get_tnow() - tstart);
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return r;
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}
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void
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toku_get_fsync_times(uint64_t *fsync_count, uint64_t *fsync_time) {
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*fsync_count = toku_fsync_count;
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*fsync_time = toku_fsync_time;
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}
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