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filesetup.c
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filesetup.c
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#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <assert.h>
#include <dirent.h>
#include <libgen.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/types.h>
#include "fio.h"
#include "smalloc.h"
#include "filehash.h"
#include "options.h"
#include "os/os.h"
#include "hash.h"
#include "lib/axmap.h"
#ifdef CONFIG_LINUX_FALLOCATE
#include <linux/falloc.h>
#endif
static int root_warn;
static FLIST_HEAD(filename_list);
static inline void clear_error(struct thread_data *td)
{
td->error = 0;
td->verror[0] = '\0';
}
/*
* Leaves f->fd open on success, caller must close
*/
static int extend_file(struct thread_data *td, struct fio_file *f)
{
int r, new_layout = 0, unlink_file = 0, flags;
unsigned long long left;
unsigned int bs;
char *b = NULL;
if (read_only) {
log_err("fio: refusing extend of file due to read-only\n");
return 0;
}
/*
* check if we need to lay the file out complete again. fio
* does that for operations involving reads, or for writes
* where overwrite is set
*/
if (td_read(td) ||
(td_write(td) && td->o.overwrite && !td->o.file_append) ||
(td_write(td) && td_ioengine_flagged(td, FIO_NOEXTEND)))
new_layout = 1;
if (td_write(td) && !td->o.overwrite && !td->o.file_append)
unlink_file = 1;
if (unlink_file || new_layout) {
int ret;
dprint(FD_FILE, "layout unlink %s\n", f->file_name);
ret = td_io_unlink_file(td, f);
if (ret != 0 && ret != ENOENT) {
td_verror(td, errno, "unlink");
return 1;
}
}
flags = O_WRONLY;
if (td->o.allow_create)
flags |= O_CREAT;
if (new_layout)
flags |= O_TRUNC;
#ifdef WIN32
flags |= _O_BINARY;
#endif
dprint(FD_FILE, "open file %s, flags %x\n", f->file_name, flags);
f->fd = open(f->file_name, flags, 0644);
if (f->fd < 0) {
int err = errno;
if (err == ENOENT && !td->o.allow_create)
log_err("fio: file creation disallowed by "
"allow_file_create=0\n");
else
td_verror(td, err, "open");
return 1;
}
#ifdef CONFIG_POSIX_FALLOCATE
if (!td->o.fill_device) {
switch (td->o.fallocate_mode) {
case FIO_FALLOCATE_NONE:
break;
case FIO_FALLOCATE_POSIX:
dprint(FD_FILE, "posix_fallocate file %s size %llu\n",
f->file_name,
(unsigned long long) f->real_file_size);
r = posix_fallocate(f->fd, 0, f->real_file_size);
if (r > 0) {
log_err("fio: posix_fallocate fails: %s\n",
strerror(r));
}
break;
#ifdef CONFIG_LINUX_FALLOCATE
case FIO_FALLOCATE_KEEP_SIZE:
dprint(FD_FILE,
"fallocate(FALLOC_FL_KEEP_SIZE) "
"file %s size %llu\n", f->file_name,
(unsigned long long) f->real_file_size);
r = fallocate(f->fd, FALLOC_FL_KEEP_SIZE, 0,
f->real_file_size);
if (r != 0)
td_verror(td, errno, "fallocate");
break;
#endif /* CONFIG_LINUX_FALLOCATE */
default:
log_err("fio: unknown fallocate mode: %d\n",
td->o.fallocate_mode);
assert(0);
}
}
#endif /* CONFIG_POSIX_FALLOCATE */
/*
* If our jobs don't require regular files initially, we're done.
*/
if (!new_layout)
goto done;
/*
* The size will be -1ULL when fill_device is used, so don't truncate
* or fallocate this file, just write it
*/
if (!td->o.fill_device) {
dprint(FD_FILE, "truncate file %s, size %llu\n", f->file_name,
(unsigned long long) f->real_file_size);
if (ftruncate(f->fd, f->real_file_size) == -1) {
if (errno != EFBIG) {
td_verror(td, errno, "ftruncate");
goto err;
}
}
}
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 = write(f->fd, b, bs);
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 (td->terminate) {
dprint(FD_FILE, "terminate unlink %s\n", f->file_name);
td_io_unlink_file(td, f);
} else if (td->o.create_fsync) {
if (fsync(f->fd) < 0) {
td_verror(td, errno, "fsync");
goto err;
}
}
if (td->o.fill_device && !td_write(td)) {
fio_file_clear_size_known(f);
if (td_io_get_file_size(td, f))
goto err;
if (f->io_size > f->real_file_size)
f->io_size = f->real_file_size;
}
free(b);
done:
return 0;
err:
close(f->fd);
f->fd = -1;
if (b)
free(b);
return 1;
}
static int pre_read_file(struct thread_data *td, struct fio_file *f)
{
int ret = 0, r, did_open = 0, old_runstate;
unsigned long long left;
unsigned int bs;
char *b;
if (td_ioengine_flagged(td, FIO_PIPEIO))
return 0;
if (!fio_file_open(f)) {
if (td->io_ops->open_file(td, f)) {
log_err("fio: cannot pre-read, failed to open file\n");
return 1;
}
did_open = 1;
}
old_runstate = td_bump_runstate(td, TD_PRE_READING);
bs = td->o.max_bs[DDIR_READ];
b = malloc(bs);
memset(b, 0, bs);
if (lseek(f->fd, f->file_offset, SEEK_SET) < 0) {
td_verror(td, errno, "lseek");
log_err("fio: failed to lseek pre-read file\n");
ret = 1;
goto error;
}
left = f->io_size;
while (left && !td->terminate) {
if (bs > left)
bs = left;
r = read(f->fd, b, bs);
if (r == (int) bs) {
left -= bs;
continue;
} else {
td_verror(td, EIO, "pre_read");
break;
}
}
error:
td_restore_runstate(td, old_runstate);
if (did_open)
td->io_ops->close_file(td, f);
free(b);
return ret;
}
unsigned long long get_rand_file_size(struct thread_data *td)
{
unsigned long long ret, sized;
uint64_t frand_max;
unsigned long r;
frand_max = rand_max(&td->file_size_state);
r = __rand(&td->file_size_state);
sized = td->o.file_size_high - td->o.file_size_low;
ret = (unsigned long long) ((double) sized * (r / (frand_max + 1.0)));
ret += td->o.file_size_low;
ret -= (ret % td->o.rw_min_bs);
return ret;
}
static int file_size(struct thread_data *td, struct fio_file *f)
{
struct stat st;
if (stat(f->file_name, &st) == -1) {
td_verror(td, errno, "fstat");
return 1;
}
f->real_file_size = st.st_size;
return 0;
}
static int bdev_size(struct thread_data *td, struct fio_file *f)
{
unsigned long long bytes = 0;
int r;
if (td->io_ops->open_file(td, f)) {
log_err("fio: failed opening blockdev %s for size check\n",
f->file_name);
return 1;
}
r = blockdev_size(f, &bytes);
if (r) {
td_verror(td, r, "blockdev_size");
goto err;
}
if (!bytes) {
log_err("%s: zero sized block device?\n", f->file_name);
goto err;
}
f->real_file_size = bytes;
td->io_ops->close_file(td, f);
return 0;
err:
td->io_ops->close_file(td, f);
return 1;
}
static int char_size(struct thread_data *td, struct fio_file *f)
{
#ifdef FIO_HAVE_CHARDEV_SIZE
unsigned long long bytes = 0;
int r;
if (td->io_ops->open_file(td, f)) {
log_err("fio: failed opening chardev %s for size check\n",
f->file_name);
return 1;
}
r = chardev_size(f, &bytes);
if (r) {
td_verror(td, r, "chardev_size");
goto err;
}
if (!bytes) {
log_err("%s: zero sized char device?\n", f->file_name);
goto err;
}
f->real_file_size = bytes;
td->io_ops->close_file(td, f);
return 0;
err:
td->io_ops->close_file(td, f);
return 1;
#else
f->real_file_size = -1ULL;
return 0;
#endif
}
static int get_file_size(struct thread_data *td, struct fio_file *f)
{
int ret = 0;
if (fio_file_size_known(f))
return 0;
if (f->filetype == FIO_TYPE_FILE)
ret = file_size(td, f);
else if (f->filetype == FIO_TYPE_BLOCK)
ret = bdev_size(td, f);
else if (f->filetype == FIO_TYPE_CHAR)
ret = char_size(td, f);
else {
f->real_file_size = -1;
log_info("%s: failed to get file size of %s\n", td->o.name,
f->file_name);
return 1; /* avoid offset extends end error message */
}
/*
* Leave ->real_file_size with 0 since it could be expectation
* of initial setup for regular files.
*/
if (ret)
return ret;
/*
* ->file_offset normally hasn't been initialized yet, so this
* is basically always false unless ->real_file_size is -1, but
* if ->real_file_size is -1 this message doesn't make sense.
* As a result, this message is basically useless.
*/
if (f->file_offset > f->real_file_size) {
log_err("%s: offset extends end (%llu > %llu)\n", td->o.name,
(unsigned long long) f->file_offset,
(unsigned long long) f->real_file_size);
return 1;
}
fio_file_set_size_known(f);
return 0;
}
static int __file_invalidate_cache(struct thread_data *td, struct fio_file *f,
unsigned long long off,
unsigned long long len)
{
int errval = 0, ret = 0;
#ifdef CONFIG_ESX
return 0;
#endif
if (len == -1ULL)
len = f->io_size;
if (off == -1ULL)
off = f->file_offset;
if (len == -1ULL || off == -1ULL)
return 0;
dprint(FD_IO, "invalidate cache %s: %llu/%llu\n", f->file_name, off,
len);
if (td->io_ops->invalidate) {
ret = td->io_ops->invalidate(td, f);
if (ret < 0)
errval = ret;
} else if (f->filetype == FIO_TYPE_FILE) {
ret = posix_fadvise(f->fd, off, len, POSIX_FADV_DONTNEED);
if (ret)
errval = ret;
} else if (f->filetype == FIO_TYPE_BLOCK) {
int retry_count = 0;
ret = blockdev_invalidate_cache(f);
while (ret < 0 && errno == EAGAIN && retry_count++ < 25) {
/*
* Linux multipath devices reject ioctl while
* the maps are being updated. That window can
* last tens of milliseconds; we'll try up to
* a quarter of a second.
*/
usleep(10000);
ret = blockdev_invalidate_cache(f);
}
if (ret < 0 && errno == EACCES && geteuid()) {
if (!root_warn) {
log_err("fio: only root may flush block "
"devices. Cache flush bypassed!\n");
root_warn = 1;
}
ret = 0;
}
if (ret < 0)
errval = errno;
} else if (f->filetype == FIO_TYPE_CHAR || f->filetype == FIO_TYPE_PIPE)
ret = 0;
/*
* Cache flushing isn't a fatal condition, and we know it will
* happen on some platforms where we don't have the proper
* function to flush eg block device caches. So just warn and
* continue on our way.
*/
if (errval)
log_info("fio: cache invalidation of %s failed: %s\n", f->file_name, strerror(errval));
return 0;
}
int file_invalidate_cache(struct thread_data *td, struct fio_file *f)
{
if (!fio_file_open(f))
return 0;
return __file_invalidate_cache(td, f, -1ULL, -1ULL);
}
int generic_close_file(struct thread_data fio_unused *td, struct fio_file *f)
{
int ret = 0;
dprint(FD_FILE, "fd close %s\n", f->file_name);
remove_file_hash(f);
if (close(f->fd) < 0)
ret = errno;
f->fd = -1;
if (f->shadow_fd != -1) {
close(f->shadow_fd);
f->shadow_fd = -1;
}
f->engine_data = 0;
return ret;
}
int file_lookup_open(struct fio_file *f, int flags)
{
struct fio_file *__f;
int from_hash;
__f = lookup_file_hash(f->file_name);
if (__f) {
dprint(FD_FILE, "found file in hash %s\n", f->file_name);
f->lock = __f->lock;
from_hash = 1;
} else {
dprint(FD_FILE, "file not found in hash %s\n", f->file_name);
from_hash = 0;
}
#ifdef WIN32
flags |= _O_BINARY;
#endif
f->fd = open(f->file_name, flags, 0600);
return from_hash;
}
static int file_close_shadow_fds(struct thread_data *td)
{
struct fio_file *f;
int num_closed = 0;
unsigned int i;
for_each_file(td, f, i) {
if (f->shadow_fd == -1)
continue;
close(f->shadow_fd);
f->shadow_fd = -1;
num_closed++;
}
return num_closed;
}
int generic_open_file(struct thread_data *td, struct fio_file *f)
{
int is_std = 0;
int flags = 0;
int from_hash = 0;
dprint(FD_FILE, "fd open %s\n", f->file_name);
if (!strcmp(f->file_name, "-")) {
if (td_rw(td)) {
log_err("fio: can't read/write to stdin/out\n");
return 1;
}
is_std = 1;
/*
* move output logging to stderr, if we are writing to stdout
*/
if (td_write(td))
f_out = stderr;
}
if (td_trim(td))
goto skip_flags;
if (td->o.odirect)
flags |= OS_O_DIRECT;
if (td->o.oatomic) {
if (!FIO_O_ATOMIC) {
td_verror(td, EINVAL, "OS does not support atomic IO");
return 1;
}
flags |= OS_O_DIRECT | FIO_O_ATOMIC;
}
if (td->o.sync_io)
flags |= O_SYNC;
if (td->o.create_on_open && td->o.allow_create)
flags |= O_CREAT;
skip_flags:
if (f->filetype != FIO_TYPE_FILE)
flags |= FIO_O_NOATIME;
open_again:
if (td_write(td)) {
if (!read_only)
flags |= O_RDWR;
if (f->filetype == FIO_TYPE_FILE && td->o.allow_create)
flags |= O_CREAT;
if (is_std)
f->fd = dup(STDOUT_FILENO);
else
from_hash = file_lookup_open(f, flags);
} else if (td_read(td)) {
if (f->filetype == FIO_TYPE_CHAR && !read_only)
flags |= O_RDWR;
else
flags |= O_RDONLY;
if (is_std)
f->fd = dup(STDIN_FILENO);
else
from_hash = file_lookup_open(f, flags);
} else { //td trim
flags |= O_RDWR;
from_hash = file_lookup_open(f, flags);
}
if (f->fd == -1) {
char buf[FIO_VERROR_SIZE];
int __e = errno;
if (__e == EPERM && (flags & FIO_O_NOATIME)) {
flags &= ~FIO_O_NOATIME;
goto open_again;
}
if (__e == EMFILE && file_close_shadow_fds(td))
goto open_again;
snprintf(buf, sizeof(buf), "open(%s)", f->file_name);
if (__e == EINVAL && (flags & OS_O_DIRECT)) {
log_err("fio: looks like your file system does not " \
"support direct=1/buffered=0\n");
}
td_verror(td, __e, buf);
return 1;
}
if (!from_hash && f->fd != -1) {
if (add_file_hash(f)) {
int fio_unused ret;
/*
* Stash away descriptor for later close. This is to
* work-around a "feature" on Linux, where a close of
* an fd that has been opened for write will trigger
* udev to call blkid to check partitions, fs id, etc.
* That pollutes the device cache, which can slow down
* unbuffered accesses.
*/
if (f->shadow_fd == -1)
f->shadow_fd = f->fd;
else {
/*
* OK to ignore, we haven't done anything
* with it
*/
ret = generic_close_file(td, f);
}
goto open_again;
}
}
return 0;
}
/*
* This function i.e. get_file_size() is the default .get_file_size
* implementation of majority of I/O engines.
*/
int generic_get_file_size(struct thread_data *td, struct fio_file *f)
{
return get_file_size(td, f);
}
/*
* open/close all files, so that ->real_file_size gets set
*/
static int get_file_sizes(struct thread_data *td)
{
struct fio_file *f;
unsigned int i;
int err = 0;
for_each_file(td, f, i) {
dprint(FD_FILE, "get file size for %p/%d/%p\n", f, i,
f->file_name);
if (td_io_get_file_size(td, f)) {
if (td->error != ENOENT) {
log_err("%s\n", td->verror);
err = 1;
break;
}
clear_error(td);
}
/*
* There are corner cases where we end up with -1 for
* ->real_file_size due to unsupported file type, etc.
* We then just set to size option value divided by number
* of files, similar to the way file ->io_size is set.
* stat(2) failure doesn't set ->real_file_size to -1.
*/
if (f->real_file_size == -1ULL && td->o.size)
f->real_file_size = td->o.size / td->o.nr_files;
}
return err;
}
struct fio_mount {
struct flist_head list;
const char *base;
char __base[256];
unsigned int key;
};
/*
* Get free number of bytes for each file on each unique mount.
*/
static unsigned long long get_fs_free_counts(struct thread_data *td)
{
struct flist_head *n, *tmp;
unsigned long long ret = 0;
struct fio_mount *fm;
FLIST_HEAD(list);
struct fio_file *f;
unsigned int i;
for_each_file(td, f, i) {
struct stat sb;
char buf[256];
if (f->filetype == FIO_TYPE_BLOCK || f->filetype == FIO_TYPE_CHAR) {
if (f->real_file_size != -1ULL)
ret += f->real_file_size;
continue;
} else if (f->filetype != FIO_TYPE_FILE)
continue;
buf[255] = '\0';
strncpy(buf, f->file_name, 255);
if (stat(buf, &sb) < 0) {
if (errno != ENOENT)
break;
strcpy(buf, ".");
if (stat(buf, &sb) < 0)
break;
}
fm = NULL;
flist_for_each(n, &list) {
fm = flist_entry(n, struct fio_mount, list);
if (fm->key == sb.st_dev)
break;
fm = NULL;
}
if (fm)
continue;
fm = calloc(1, sizeof(*fm));
strncpy(fm->__base, buf, sizeof(fm->__base) - 1);
fm->base = basename(fm->__base);
fm->key = sb.st_dev;
flist_add(&fm->list, &list);
}
flist_for_each_safe(n, tmp, &list) {
unsigned long long sz;
fm = flist_entry(n, struct fio_mount, list);
flist_del(&fm->list);
sz = get_fs_free_size(fm->base);
if (sz && sz != -1ULL)
ret += sz;
free(fm);
}
return ret;
}
uint64_t get_start_offset(struct thread_data *td, struct fio_file *f)
{
struct thread_options *o = &td->o;
if (o->file_append && f->filetype == FIO_TYPE_FILE)
return f->real_file_size;
return td->o.start_offset +
td->subjob_number * td->o.offset_increment;
}
/*
* Open the files and setup files sizes, creating files if necessary.
*/
int setup_files(struct thread_data *td)
{
unsigned long long total_size, extend_size;
struct thread_options *o = &td->o;
struct fio_file *f;
unsigned int i, nr_fs_extra = 0;
int err = 0, need_extend;
int old_state;
const unsigned int bs = td_min_bs(td);
uint64_t fs = 0;
dprint(FD_FILE, "setup files\n");
old_state = td_bump_runstate(td, TD_SETTING_UP);
if (o->read_iolog_file)
goto done;
/*
* Find out physical size of files or devices for this thread,
* before we determine I/O size and range of our targets.
* If ioengine defines a setup() method, it's responsible for
* opening the files and setting f->real_file_size to indicate
* the valid range for that file.
*/
if (td->io_ops->setup)
err = td->io_ops->setup(td);
else
err = get_file_sizes(td);
if (err)
goto err_out;
/*
* check sizes. if the files/devices do not exist and the size
* isn't passed to fio, abort.
*/
total_size = 0;
for_each_file(td, f, i) {
f->fileno = i;
if (f->real_file_size == -1ULL)
total_size = -1ULL;
else
total_size += f->real_file_size;
}
if (o->fill_device)
td->fill_device_size = get_fs_free_counts(td);
/*
* device/file sizes are zero and no size given, punt
*/
if ((!total_size || total_size == -1ULL) && !o->size &&
!td_ioengine_flagged(td, FIO_NOIO) && !o->fill_device &&
!(o->nr_files && (o->file_size_low || o->file_size_high))) {
log_err("%s: you need to specify size=\n", o->name);
td_verror(td, EINVAL, "total_file_size");
goto err_out;
}
/*
* Calculate per-file size and potential extra size for the
* first files, if needed (i.e. if we don't have a fixed size).
*/
if (!o->file_size_low && o->nr_files) {
uint64_t all_fs;
fs = o->size / o->nr_files;
all_fs = fs * o->nr_files;
if (all_fs < o->size)
nr_fs_extra = (o->size - all_fs) / bs;
}
/*
* now file sizes are known, so we can set ->io_size. if size= is
* not given, ->io_size is just equal to ->real_file_size. if size
* is given, ->io_size is size / nr_files.
*/
extend_size = total_size = 0;
need_extend = 0;
for_each_file(td, f, i) {
f->file_offset = get_start_offset(td, f);
/*
* Update ->io_size depending on options specified.
* ->file_size_low being 0 means filesize option isn't set.
* Non zero ->file_size_low equals ->file_size_high means
* filesize option is set in a fixed size format.
* Non zero ->file_size_low not equals ->file_size_high means
* filesize option is set in a range format.
*/
if (!o->file_size_low) {
/*
* no file size or range given, file size is equal to
* total size divided by number of files. If that is
* zero, set it to the real file size. If the size
* doesn't divide nicely with the min blocksize,
* make the first files bigger.
*/
f->io_size = fs;
if (nr_fs_extra) {
nr_fs_extra--;
f->io_size += bs;
}
if (!f->io_size)
f->io_size = f->real_file_size - f->file_offset;
} else if (f->real_file_size < o->file_size_low ||
f->real_file_size > o->file_size_high) {
if (f->file_offset > o->file_size_low)
goto err_offset;
/*
* file size given. if it's fixed, use that. if it's a
* range, generate a random size in-between.
*/
if (o->file_size_low == o->file_size_high)
f->io_size = o->file_size_low - f->file_offset;
else {
f->io_size = get_rand_file_size(td)
- f->file_offset;
}
} else
f->io_size = f->real_file_size - f->file_offset;
if (f->io_size == -1ULL)
total_size = -1ULL;
else {
if (o->size_percent) {
f->io_size = (f->io_size * o->size_percent) / 100;
f->io_size -= (f->io_size % td_min_bs(td));
}
total_size += f->io_size;
}
if (f->filetype == FIO_TYPE_FILE &&
(f->io_size + f->file_offset) > f->real_file_size &&
!td_ioengine_flagged(td, FIO_DISKLESSIO)) {
if (!o->create_on_open) {
need_extend++;
extend_size += (f->io_size + f->file_offset);
} else
f->real_file_size = f->io_size + f->file_offset;
fio_file_set_extend(f);
}
}
if (td->o.block_error_hist) {
int len;
assert(td->o.nr_files == 1); /* checked in fixup_options */
f = td->files[0];
len = f->io_size / td->o.bs[DDIR_TRIM];
if (len > MAX_NR_BLOCK_INFOS || len <= 0) {
log_err("fio: cannot calculate block histogram with "
"%d trim blocks, maximum %d\n",
len, MAX_NR_BLOCK_INFOS);
td_verror(td, EINVAL, "block_error_hist");
goto err_out;
}
td->ts.nr_block_infos = len;
for (i = 0; i < len; i++)
td->ts.block_infos[i] =
BLOCK_INFO(0, BLOCK_STATE_UNINIT);
} else
td->ts.nr_block_infos = 0;
if (!o->size || (total_size && o->size > total_size))
o->size = total_size;
if (o->size < td_min_bs(td)) {
log_err("fio: blocksize too large for data set\n");
goto err_out;
}
/*
* See if we need to extend some files, typically needed when our
* target regular files don't exist yet, but our jobs require them
* initially due to read I/Os.
*/
if (need_extend) {
temp_stall_ts = 1;
if (output_format & FIO_OUTPUT_NORMAL)
log_info("%s: Laying out IO file(s) (%u file(s) / %lluMiB)\n",
o->name, need_extend, extend_size >> 20);
for_each_file(td, f, i) {
unsigned long long old_len = -1ULL, extend_len = -1ULL;
if (!fio_file_extend(f))
continue;
assert(f->filetype == FIO_TYPE_FILE);
fio_file_clear_extend(f);
if (!o->fill_device) {
old_len = f->real_file_size;