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iolog.c
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iolog.c
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/*
* Code related to writing an iolog of what a thread is doing, and to
* later read that back and replay
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef CONFIG_ZLIB
#include <zlib.h>
#endif
#include "flist.h"
#include "fio.h"
#include "trim.h"
#include "filelock.h"
#include "smalloc.h"
#include "blktrace.h"
#include "pshared.h"
#include "lib/roundup.h"
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
static int iolog_flush(struct io_log *log);
static const char iolog_ver2[] = "fio version 2 iolog";
void queue_io_piece(struct thread_data *td, struct io_piece *ipo)
{
flist_add_tail(&ipo->list, &td->io_log_list);
td->total_io_size += ipo->len;
}
void log_io_u(const struct thread_data *td, const struct io_u *io_u)
{
if (!td->o.write_iolog_file)
return;
fprintf(td->iolog_f, "%s %s %llu %llu\n", io_u->file->file_name,
io_ddir_name(io_u->ddir),
io_u->offset, io_u->buflen);
}
void log_file(struct thread_data *td, struct fio_file *f,
enum file_log_act what)
{
const char *act[] = { "add", "open", "close" };
assert(what < 3);
if (!td->o.write_iolog_file)
return;
/*
* this happens on the pre-open/close done before the job starts
*/
if (!td->iolog_f)
return;
fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
}
static void iolog_delay(struct thread_data *td, unsigned long delay)
{
uint64_t usec = utime_since_now(&td->last_issue);
unsigned long orig_delay = delay;
uint64_t this_delay;
struct timespec ts;
if (delay < td->time_offset) {
td->time_offset = 0;
return;
}
delay -= td->time_offset;
if (delay < usec)
return;
delay -= usec;
fio_gettime(&ts, NULL);
while (delay && !td->terminate) {
this_delay = delay;
if (this_delay > 500000)
this_delay = 500000;
usec_sleep(td, this_delay);
delay -= this_delay;
}
usec = utime_since_now(&ts);
if (usec > orig_delay)
td->time_offset = usec - orig_delay;
else
td->time_offset = 0;
}
static int ipo_special(struct thread_data *td, struct io_piece *ipo)
{
struct fio_file *f;
int ret;
/*
* Not a special ipo
*/
if (ipo->ddir != DDIR_INVAL)
return 0;
f = td->files[ipo->fileno];
switch (ipo->file_action) {
case FIO_LOG_OPEN_FILE:
if (td->o.replay_redirect && fio_file_open(f)) {
dprint(FD_FILE, "iolog: ignoring re-open of file %s\n",
f->file_name);
break;
}
ret = td_io_open_file(td, f);
if (!ret)
break;
td_verror(td, ret, "iolog open file");
return -1;
case FIO_LOG_CLOSE_FILE:
td_io_close_file(td, f);
break;
case FIO_LOG_UNLINK_FILE:
td_io_unlink_file(td, f);
break;
default:
log_err("fio: bad file action %d\n", ipo->file_action);
break;
}
return 1;
}
static bool read_iolog2(struct thread_data *td);
int read_iolog_get(struct thread_data *td, struct io_u *io_u)
{
struct io_piece *ipo;
unsigned long elapsed;
while (!flist_empty(&td->io_log_list)) {
int ret;
if (td->o.read_iolog_chunked) {
if (td->io_log_checkmark == td->io_log_current) {
if (td->io_log_blktrace) {
if (!read_blktrace(td))
return 1;
} else {
if (!read_iolog2(td))
return 1;
}
}
td->io_log_current--;
}
ipo = flist_first_entry(&td->io_log_list, struct io_piece, list);
flist_del(&ipo->list);
remove_trim_entry(td, ipo);
ret = ipo_special(td, ipo);
if (ret < 0) {
free(ipo);
break;
} else if (ret > 0) {
free(ipo);
continue;
}
io_u->ddir = ipo->ddir;
if (ipo->ddir != DDIR_WAIT) {
io_u->offset = ipo->offset;
io_u->verify_offset = ipo->offset;
io_u->buflen = ipo->len;
io_u->file = td->files[ipo->fileno];
get_file(io_u->file);
dprint(FD_IO, "iolog: get %llu/%llu/%s\n", io_u->offset,
io_u->buflen, io_u->file->file_name);
if (ipo->delay)
iolog_delay(td, ipo->delay);
} else {
elapsed = mtime_since_genesis();
if (ipo->delay > elapsed)
usec_sleep(td, (ipo->delay - elapsed) * 1000);
}
free(ipo);
if (io_u->ddir != DDIR_WAIT)
return 0;
}
td->done = 1;
return 1;
}
void prune_io_piece_log(struct thread_data *td)
{
struct io_piece *ipo;
struct fio_rb_node *n;
while ((n = rb_first(&td->io_hist_tree)) != NULL) {
ipo = rb_entry(n, struct io_piece, rb_node);
rb_erase(n, &td->io_hist_tree);
remove_trim_entry(td, ipo);
td->io_hist_len--;
free(ipo);
}
while (!flist_empty(&td->io_hist_list)) {
ipo = flist_first_entry(&td->io_hist_list, struct io_piece, list);
flist_del(&ipo->list);
remove_trim_entry(td, ipo);
td->io_hist_len--;
free(ipo);
}
}
/*
* log a successful write, so we can unwind the log for verify
*/
void log_io_piece(struct thread_data *td, struct io_u *io_u)
{
struct fio_rb_node **p, *parent;
struct io_piece *ipo, *__ipo;
ipo = calloc(1, sizeof(struct io_piece));
init_ipo(ipo);
ipo->file = io_u->file;
ipo->offset = io_u->offset;
ipo->len = io_u->buflen;
ipo->numberio = io_u->numberio;
ipo->flags = IP_F_IN_FLIGHT;
io_u->ipo = ipo;
if (io_u_should_trim(td, io_u)) {
flist_add_tail(&ipo->trim_list, &td->trim_list);
td->trim_entries++;
}
/*
* Only sort writes if we don't have a random map in which case we need
* to check for duplicate blocks and drop the old one, which we rely on
* the rb insert/lookup for handling.
*/
if (file_randommap(td, ipo->file)) {
INIT_FLIST_HEAD(&ipo->list);
flist_add_tail(&ipo->list, &td->io_hist_list);
ipo->flags |= IP_F_ONLIST;
td->io_hist_len++;
return;
}
RB_CLEAR_NODE(&ipo->rb_node);
/*
* Sort the entry into the verification list
*/
restart:
p = &td->io_hist_tree.rb_node;
parent = NULL;
while (*p) {
int overlap = 0;
parent = *p;
__ipo = rb_entry(parent, struct io_piece, rb_node);
if (ipo->file < __ipo->file)
p = &(*p)->rb_left;
else if (ipo->file > __ipo->file)
p = &(*p)->rb_right;
else if (ipo->offset < __ipo->offset) {
p = &(*p)->rb_left;
overlap = ipo->offset + ipo->len > __ipo->offset;
}
else if (ipo->offset > __ipo->offset) {
p = &(*p)->rb_right;
overlap = __ipo->offset + __ipo->len > ipo->offset;
}
else
overlap = 1;
if (overlap) {
dprint(FD_IO, "iolog: overlap %llu/%lu, %llu/%lu\n",
__ipo->offset, __ipo->len,
ipo->offset, ipo->len);
td->io_hist_len--;
rb_erase(parent, &td->io_hist_tree);
remove_trim_entry(td, __ipo);
if (!(__ipo->flags & IP_F_IN_FLIGHT))
free(__ipo);
goto restart;
}
}
rb_link_node(&ipo->rb_node, parent, p);
rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
ipo->flags |= IP_F_ONRB;
td->io_hist_len++;
}
void unlog_io_piece(struct thread_data *td, struct io_u *io_u)
{
struct io_piece *ipo = io_u->ipo;
if (td->ts.nr_block_infos) {
uint32_t *info = io_u_block_info(td, io_u);
if (BLOCK_INFO_STATE(*info) < BLOCK_STATE_TRIM_FAILURE) {
if (io_u->ddir == DDIR_TRIM)
*info = BLOCK_INFO_SET_STATE(*info,
BLOCK_STATE_TRIM_FAILURE);
else if (io_u->ddir == DDIR_WRITE)
*info = BLOCK_INFO_SET_STATE(*info,
BLOCK_STATE_WRITE_FAILURE);
}
}
if (!ipo)
return;
if (ipo->flags & IP_F_ONRB)
rb_erase(&ipo->rb_node, &td->io_hist_tree);
else if (ipo->flags & IP_F_ONLIST)
flist_del(&ipo->list);
free(ipo);
io_u->ipo = NULL;
td->io_hist_len--;
}
void trim_io_piece(const struct io_u *io_u)
{
struct io_piece *ipo = io_u->ipo;
if (!ipo)
return;
ipo->len = io_u->xfer_buflen - io_u->resid;
}
void write_iolog_close(struct thread_data *td)
{
if (!td->iolog_f)
return;
fflush(td->iolog_f);
fclose(td->iolog_f);
free(td->iolog_buf);
td->iolog_f = NULL;
td->iolog_buf = NULL;
}
int64_t iolog_items_to_fetch(struct thread_data *td)
{
struct timespec now;
uint64_t elapsed;
uint64_t for_1s;
int64_t items_to_fetch;
if (!td->io_log_highmark)
return 10;
fio_gettime(&now, NULL);
elapsed = ntime_since(&td->io_log_highmark_time, &now);
if (elapsed) {
for_1s = (td->io_log_highmark - td->io_log_current) * 1000000000 / elapsed;
items_to_fetch = for_1s - td->io_log_current;
if (items_to_fetch < 0)
items_to_fetch = 0;
} else
items_to_fetch = 0;
td->io_log_highmark = td->io_log_current + items_to_fetch;
td->io_log_checkmark = (td->io_log_highmark + 1) / 2;
fio_gettime(&td->io_log_highmark_time, NULL);
return items_to_fetch;
}
/*
* Read version 2 iolog data. It is enhanced to include per-file logging,
* syncs, etc.
*/
static bool read_iolog2(struct thread_data *td)
{
unsigned long long offset;
unsigned int bytes;
int reads, writes, waits, fileno = 0, file_action = 0; /* stupid gcc */
char *rfname, *fname, *act;
char *str, *p;
enum fio_ddir rw;
bool realloc = false;
int64_t items_to_fetch = 0;
if (td->o.read_iolog_chunked) {
items_to_fetch = iolog_items_to_fetch(td);
if (!items_to_fetch)
return true;
}
/*
* Read in the read iolog and store it, reuse the infrastructure
* for doing verifications.
*/
str = malloc(4096);
rfname = fname = malloc(256+16);
act = malloc(256+16);
reads = writes = waits = 0;
while ((p = fgets(str, 4096, td->io_log_rfile)) != NULL) {
struct io_piece *ipo;
int r;
r = sscanf(p, "%256s %256s %llu %u", rfname, act, &offset,
&bytes);
if (td->o.replay_redirect)
fname = td->o.replay_redirect;
if (r == 4) {
/*
* Check action first
*/
if (!strcmp(act, "wait"))
rw = DDIR_WAIT;
else if (!strcmp(act, "read"))
rw = DDIR_READ;
else if (!strcmp(act, "write"))
rw = DDIR_WRITE;
else if (!strcmp(act, "sync"))
rw = DDIR_SYNC;
else if (!strcmp(act, "datasync"))
rw = DDIR_DATASYNC;
else if (!strcmp(act, "trim"))
rw = DDIR_TRIM;
else {
log_err("fio: bad iolog file action: %s\n",
act);
continue;
}
fileno = get_fileno(td, fname);
} else if (r == 2) {
rw = DDIR_INVAL;
if (!strcmp(act, "add")) {
if (td->o.replay_redirect &&
get_fileno(td, fname) != -1) {
dprint(FD_FILE, "iolog: ignoring"
" re-add of file %s\n", fname);
} else {
fileno = add_file(td, fname, td->subjob_number, 1);
file_action = FIO_LOG_ADD_FILE;
}
continue;
} else if (!strcmp(act, "open")) {
fileno = get_fileno(td, fname);
file_action = FIO_LOG_OPEN_FILE;
} else if (!strcmp(act, "close")) {
fileno = get_fileno(td, fname);
file_action = FIO_LOG_CLOSE_FILE;
} else {
log_err("fio: bad iolog file action: %s\n",
act);
continue;
}
} else {
log_err("bad iolog2: %s\n", p);
continue;
}
if (rw == DDIR_READ)
reads++;
else if (rw == DDIR_WRITE) {
/*
* Don't add a write for ro mode
*/
if (read_only)
continue;
writes++;
} else if (rw == DDIR_WAIT) {
if (td->o.no_stall)
continue;
waits++;
} else if (rw == DDIR_INVAL) {
} else if (!ddir_sync(rw)) {
log_err("bad ddir: %d\n", rw);
continue;
}
/*
* Make note of file
*/
ipo = calloc(1, sizeof(*ipo));
init_ipo(ipo);
ipo->ddir = rw;
if (rw == DDIR_WAIT) {
ipo->delay = offset;
} else {
if (td->o.replay_scale)
ipo->offset = offset / td->o.replay_scale;
else
ipo->offset = offset;
ipo_bytes_align(td->o.replay_align, ipo);
ipo->len = bytes;
if (rw != DDIR_INVAL && bytes > td->o.max_bs[rw]) {
realloc = true;
td->o.max_bs[rw] = bytes;
}
ipo->fileno = fileno;
ipo->file_action = file_action;
td->o.size += bytes;
}
queue_io_piece(td, ipo);
if (td->o.read_iolog_chunked) {
td->io_log_current++;
items_to_fetch--;
if (items_to_fetch == 0)
break;
}
}
free(str);
free(act);
free(rfname);
if (td->o.read_iolog_chunked) {
td->io_log_highmark = td->io_log_current;
td->io_log_checkmark = (td->io_log_highmark + 1) / 2;
fio_gettime(&td->io_log_highmark_time, NULL);
}
if (writes && read_only) {
log_err("fio: <%s> skips replay of %d writes due to"
" read-only\n", td->o.name, writes);
writes = 0;
}
if (td->o.read_iolog_chunked) {
if (td->io_log_current == 0) {
return false;
}
td->o.td_ddir = TD_DDIR_RW;
if (realloc && td->orig_buffer)
{
io_u_quiesce(td);
free_io_mem(td);
init_io_u_buffers(td);
}
return true;
}
if (!reads && !writes && !waits)
return false;
else if (reads && !writes)
td->o.td_ddir = TD_DDIR_READ;
else if (!reads && writes)
td->o.td_ddir = TD_DDIR_WRITE;
else
td->o.td_ddir = TD_DDIR_RW;
return true;
}
static bool is_socket(const char *path)
{
struct stat buf;
int r;
r = stat(path, &buf);
if (r == -1)
return false;
return S_ISSOCK(buf.st_mode);
}
static int open_socket(const char *path)
{
struct sockaddr_un addr;
int ret, fd;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return fd;
addr.sun_family = AF_UNIX;
if (snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", path) >=
sizeof(addr.sun_path)) {
log_err("%s: path name %s is too long for a Unix socket\n",
__func__, path);
}
ret = connect(fd, (const struct sockaddr *)&addr, strlen(path) + sizeof(addr.sun_family));
if (!ret)
return fd;
close(fd);
return -1;
}
/*
* open iolog, check version, and call appropriate parser
*/
static bool init_iolog_read(struct thread_data *td, char *fname)
{
char buffer[256], *p;
FILE *f = NULL;
dprint(FD_IO, "iolog: name=%s\n", fname);
if (is_socket(fname)) {
int fd;
fd = open_socket(fname);
if (fd >= 0)
f = fdopen(fd, "r");
} else if (!strcmp(fname, "-")) {
f = stdin;
} else
f = fopen(fname, "r");
if (!f) {
perror("fopen read iolog");
return false;
}
p = fgets(buffer, sizeof(buffer), f);
if (!p) {
td_verror(td, errno, "iolog read");
log_err("fio: unable to read iolog\n");
fclose(f);
return false;
}
/*
* version 2 of the iolog stores a specific string as the
* first line, check for that
*/
if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2))) {
free_release_files(td);
td->io_log_rfile = f;
return read_iolog2(td);
}
log_err("fio: iolog version 1 is no longer supported\n");
fclose(f);
return false;
}
/*
* Set up a log for storing io patterns.
*/
static bool init_iolog_write(struct thread_data *td)
{
struct fio_file *ff;
FILE *f;
unsigned int i;
f = fopen(td->o.write_iolog_file, "a");
if (!f) {
perror("fopen write iolog");
return false;
}
/*
* That's it for writing, setup a log buffer and we're done.
*/
td->iolog_f = f;
td->iolog_buf = malloc(8192);
setvbuf(f, td->iolog_buf, _IOFBF, 8192);
/*
* write our version line
*/
if (fprintf(f, "%s\n", iolog_ver2) < 0) {
perror("iolog init\n");
return false;
}
/*
* add all known files
*/
for_each_file(td, ff, i)
log_file(td, ff, FIO_LOG_ADD_FILE);
return true;
}
bool init_iolog(struct thread_data *td)
{
bool ret;
if (td->o.read_iolog_file) {
int need_swap;
char * fname = get_name_by_idx(td->o.read_iolog_file, td->subjob_number);
/*
* Check if it's a blktrace file and load that if possible.
* Otherwise assume it's a normal log file and load that.
*/
if (is_blktrace(fname, &need_swap)) {
td->io_log_blktrace = 1;
ret = init_blktrace_read(td, fname, need_swap);
} else {
td->io_log_blktrace = 0;
ret = init_iolog_read(td, fname);
}
free(fname);
} else if (td->o.write_iolog_file)
ret = init_iolog_write(td);
else
ret = true;
if (!ret)
td_verror(td, EINVAL, "failed initializing iolog");
return ret;
}
void setup_log(struct io_log **log, struct log_params *p,
const char *filename)
{
struct io_log *l;
int i;
struct io_u_plat_entry *entry;
struct flist_head *list;
l = scalloc(1, sizeof(*l));
INIT_FLIST_HEAD(&l->io_logs);
l->log_type = p->log_type;
l->log_offset = p->log_offset;
l->log_prio = p->log_prio;
l->log_gz = p->log_gz;
l->log_gz_store = p->log_gz_store;
l->avg_msec = p->avg_msec;
l->hist_msec = p->hist_msec;
l->hist_coarseness = p->hist_coarseness;
l->filename = strdup(filename);
l->td = p->td;
/* Initialize histogram lists for each r/w direction,
* with initial io_u_plat of all zeros:
*/
for (i = 0; i < DDIR_RWDIR_CNT; i++) {
list = &l->hist_window[i].list;
INIT_FLIST_HEAD(list);
entry = calloc(1, sizeof(struct io_u_plat_entry));
flist_add(&entry->list, list);
}
if (l->td && l->td->o.io_submit_mode != IO_MODE_OFFLOAD) {
unsigned int def_samples = DEF_LOG_ENTRIES;
struct io_logs *__p;
__p = calloc(1, sizeof(*l->pending));
if (l->td->o.iodepth > DEF_LOG_ENTRIES)
def_samples = roundup_pow2(l->td->o.iodepth);
__p->max_samples = def_samples;
__p->log = calloc(__p->max_samples, log_entry_sz(l));
l->pending = __p;
}
if (l->log_offset)
l->log_ddir_mask = LOG_OFFSET_SAMPLE_BIT;
if (l->log_prio)
l->log_ddir_mask |= LOG_PRIO_SAMPLE_BIT;
INIT_FLIST_HEAD(&l->chunk_list);
if (l->log_gz && !p->td)
l->log_gz = 0;
else if (l->log_gz || l->log_gz_store) {
mutex_init_pshared(&l->chunk_lock);
mutex_init_pshared(&l->deferred_free_lock);
p->td->flags |= TD_F_COMPRESS_LOG;
}
*log = l;
}
#ifdef CONFIG_SETVBUF
static void *set_file_buffer(FILE *f)
{
size_t size = 1048576;
void *buf;
buf = malloc(size);
setvbuf(f, buf, _IOFBF, size);
return buf;
}
static void clear_file_buffer(void *buf)
{
free(buf);
}
#else
static void *set_file_buffer(FILE *f)
{
return NULL;
}
static void clear_file_buffer(void *buf)
{
}
#endif
void free_log(struct io_log *log)
{
while (!flist_empty(&log->io_logs)) {
struct io_logs *cur_log;
cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
flist_del_init(&cur_log->list);
free(cur_log->log);
sfree(cur_log);
}
if (log->pending) {
free(log->pending->log);
free(log->pending);
log->pending = NULL;
}
free(log->pending);
free(log->filename);
sfree(log);
}
uint64_t hist_sum(int j, int stride, uint64_t *io_u_plat,
uint64_t *io_u_plat_last)
{
uint64_t sum;
int k;
if (io_u_plat_last) {
for (k = sum = 0; k < stride; k++)
sum += io_u_plat[j + k] - io_u_plat_last[j + k];
} else {
for (k = sum = 0; k < stride; k++)
sum += io_u_plat[j + k];
}
return sum;
}
static void flush_hist_samples(FILE *f, int hist_coarseness, void *samples,
uint64_t sample_size)
{
struct io_sample *s;
int log_offset;
uint64_t i, j, nr_samples;
struct io_u_plat_entry *entry, *entry_before;
uint64_t *io_u_plat;
uint64_t *io_u_plat_before;
int stride = 1 << hist_coarseness;
if (!sample_size)
return;
s = __get_sample(samples, 0, 0);
log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
nr_samples = sample_size / __log_entry_sz(log_offset);
for (i = 0; i < nr_samples; i++) {
s = __get_sample(samples, log_offset, i);
entry = s->data.plat_entry;
io_u_plat = entry->io_u_plat;
entry_before = flist_first_entry(&entry->list, struct io_u_plat_entry, list);
io_u_plat_before = entry_before->io_u_plat;
fprintf(f, "%lu, %u, %llu, ", (unsigned long) s->time,
io_sample_ddir(s), (unsigned long long) s->bs);
for (j = 0; j < FIO_IO_U_PLAT_NR - stride; j += stride) {
fprintf(f, "%llu, ", (unsigned long long)
hist_sum(j, stride, io_u_plat, io_u_plat_before));
}
fprintf(f, "%llu\n", (unsigned long long)
hist_sum(FIO_IO_U_PLAT_NR - stride, stride, io_u_plat,
io_u_plat_before));
flist_del(&entry_before->list);
free(entry_before);
}
}
void flush_samples(FILE *f, void *samples, uint64_t sample_size)
{
struct io_sample *s;
int log_offset, log_prio;
uint64_t i, nr_samples;
unsigned int prio_val;
const char *fmt;
if (!sample_size)
return;
s = __get_sample(samples, 0, 0);
log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
log_prio = (s->__ddir & LOG_PRIO_SAMPLE_BIT) != 0;
if (log_offset) {
if (log_prio)
fmt = "%lu, %" PRId64 ", %u, %llu, %llu, 0x%04x\n";
else
fmt = "%lu, %" PRId64 ", %u, %llu, %llu, %u\n";
} else {
if (log_prio)
fmt = "%lu, %" PRId64 ", %u, %llu, 0x%04x\n";
else
fmt = "%lu, %" PRId64 ", %u, %llu, %u\n";
}
nr_samples = sample_size / __log_entry_sz(log_offset);
for (i = 0; i < nr_samples; i++) {
s = __get_sample(samples, log_offset, i);
if (log_prio)
prio_val = s->priority;
else
prio_val = ioprio_value_is_class_rt(s->priority);
if (!log_offset) {
fprintf(f, fmt,
(unsigned long) s->time,
s->data.val,
io_sample_ddir(s), (unsigned long long) s->bs,
prio_val);
} else {
struct io_sample_offset *so = (void *) s;
fprintf(f, fmt,
(unsigned long) s->time,
s->data.val,
io_sample_ddir(s), (unsigned long long) s->bs,
(unsigned long long) so->offset,
prio_val);
}
}
}
#ifdef CONFIG_ZLIB
struct iolog_flush_data {
struct workqueue_work work;
struct io_log *log;
void *samples;
uint32_t nr_samples;
bool free;
};
#define GZ_CHUNK 131072
static struct iolog_compress *get_new_chunk(unsigned int seq)
{
struct iolog_compress *c;
c = malloc(sizeof(*c));
INIT_FLIST_HEAD(&c->list);
c->buf = malloc(GZ_CHUNK);
c->len = 0;
c->seq = seq;
return c;
}
static void free_chunk(struct iolog_compress *ic)
{
free(ic->buf);
free(ic);
}
static int z_stream_init(z_stream *stream, int gz_hdr)
{
int wbits = 15;
memset(stream, 0, sizeof(*stream));
stream->zalloc = Z_NULL;
stream->zfree = Z_NULL;
stream->opaque = Z_NULL;
stream->next_in = Z_NULL;
/*
* zlib magic - add 32 for auto-detection of gz header or not,
* if we decide to store files in a gzip friendly format.