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#define _FASTWRITER_DEFAULT_C
#define _GNU_SOURCE
#define _XOPEN_SOURCE 600
#define _POSIX_C_SOURCE 200112L
#define _LARGEFILE64_SOURCE
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#ifdef HAVE_LINUX_FALLOC_H
# include <linux/falloc.h>
#endif /* HAVE_LINUX_FALLOC_H */
#include "fastwriter.h"
#include "private.h"
#include "sysinfo.h"
#include "default.h"
#define SYNC_MODE
#define HAVE_FALLOCATE
#define EXT4_WRITEBLOCK 4194304
#define EXT4_PREALLOCATE 1073741824
typedef struct {
int fd;
int sync_mode;
size_t prior_size; /**< original size of file */
size_t preallocated; /**< preallocated bytes */
size_t wr_block; /**< minimal block of data to write */
size_t pa_block; /**< preallocation setp */
} fastwriter_default_t;
int fastwriter_default_open(fastwriter_t *fw, const char *name, fastwriter_flags_t flags) {
int err;
char fs[16];
int open_flags = (O_CREAT|O_WRONLY|O_NOATIME|O_LARGEFILE);
int open_mode = (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
fastwriter_default_t *ctx;
err = fastwriter_get_file_fs(name, sizeof(fs) - 1, fs);
if (err) return err;
ctx = (fastwriter_default_t*)malloc(sizeof(fastwriter_default_t));
if (!ctx) return ENOMEM;
memset(ctx, 0, sizeof(fastwriter_default_t));
fw->ctx = ctx;
#ifdef SYNC_MODE
ctx->sync_mode = 1;
#endif /* SYNC_MODE */
ctx->prior_size = 0;
if (!strcmp(fs, "raw")) {
ctx->wr_block = EXT4_WRITEBLOCK;
ctx->pa_block = 0;
ctx->prior_size = (size_t)-1;
#ifdef SYNC_MODE
ctx->sync_mode = 0;
#endif /* SYNC_MODE */
} else if (!strcmp(fs, "ext4")) {
ctx->wr_block = EXT4_WRITEBLOCK;
ctx->pa_block = EXT4_PREALLOCATE;
} else if (!strcmp(fs, "btrfs")) {
ctx->wr_block = EXT4_WRITEBLOCK;
ctx->pa_block = EXT4_PREALLOCATE;
} else if (!strcmp(fs, "xfs")) {
ctx->wr_block = EXT4_WRITEBLOCK;
ctx->pa_block = EXT4_PREALLOCATE;
} else {
ctx->wr_block = EXT4_WRITEBLOCK;
ctx->pa_block = 0;
}
#ifdef SYNC_MODE
if (ctx->sync_mode) {
open_flags |= O_DIRECT;
}
#endif /* SYNC_MODE */
if (flags&FASTWRITER_FLAGS_OVERWRITE)
open_flags |= O_TRUNC;
ctx->fd = open(name, open_flags, open_mode);
if (ctx->fd < 0) return errno;
if (((open_flags&FASTWRITER_FLAGS_OVERWRITE)==0)&&(strcmp(fs, "raw"))) {
ctx->prior_size = lseek(ctx->fd, 0, SEEK_END);
# ifdef SYNC_MODE
if (ctx->prior_size%FASTWRITER_SYNCIO_ALIGN) {
close(ctx->fd);
ctx->fd = open(name, open_flags&~O_DIRECT, open_mode);
if (ctx->fd < 0) return errno;
ctx->prior_size = lseek(ctx->fd, 0, SEEK_END);
ctx->sync_mode = 0;
}
# endif /* SYNC_MODE */
}
ctx->preallocated = 0;
return 0;
}
void fastwriter_default_close(fastwriter_t *fw) {
if (fw->ctx) {
fastwriter_default_t *ctx = (fastwriter_default_t*)fw->ctx;
if (ctx->fd >= 0) {
#if defined(SYNC_MODE)||!defined(HAVE_LINUX_FALLOC_H)
if (ctx->prior_size != (size_t)-1) {
ftruncate(ctx->fd, ctx->prior_size + fw->written);
}
#endif
close(ctx->fd);
}
free(ctx);
fw->ctx = NULL;
}
}
int fastwriter_default_write(fastwriter_t *fw, fastwriter_write_flags_t flags, size_t size, void *data, size_t *written) {
size_t sum = 0;
size_t delta = 0;
ssize_t res;
fastwriter_default_t *ctx = (fastwriter_default_t*)fw->ctx;
if ((flags&FASTWRITER_WRITE_FLAG_FORCE)==0) {
if (size < ctx->wr_block) {
*written = 0;
return 0;
}
size -= size % ctx->wr_block;
}
if ((ctx->pa_block)&&((fw->written + size) > ctx->preallocated)) {
#ifdef HAVE_LINUX_FALLOC_H
if (fallocate(ctx->fd, FALLOC_FL_KEEP_SIZE, ctx->preallocated, ctx->pa_block)) {
#else /* HAVE_LINUX_FALLOC_H */
if (posix_fallocate(ctx->fd, ctx->preallocated, ctx->pa_block)) {
#endif /* HAVE_LINUX_FALLOC_H */
ctx->pa_block = 0;
} else {
ctx->preallocated += ctx->pa_block;
}
}
#ifdef SYNC_MODE
// we expect this to happen only at last iteration (buffer is multiply of the required align)
if ((ctx->sync_mode)&&(size%FASTWRITER_SYNCIO_ALIGN)) {
delta = FASTWRITER_SYNCIO_ALIGN - size%FASTWRITER_SYNCIO_ALIGN;
}
#endif /* SYNC_MODE */
do {
res = write(ctx->fd, data + sum, size + delta - sum);
if (res < 0) {
*written = sum;
return errno;
}
sum += res;
} while (sum < size);
#ifdef SYNC_MODE
posix_fadvise(ctx->fd, fw->written, size, POSIX_FADV_DONTNEED);
#endif /* SYNC_MODE */
*written = size;
return 0;
}
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