568 строки
16 KiB
C
568 строки
16 KiB
C
/*
|
|
* alloc.c - NILFS dat/inode allocator
|
|
*
|
|
* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* Original code was written by Koji Sato <koji@osrg.net>.
|
|
* Two allocators were unified by Ryusuke Konishi <ryusuke@osrg.net>,
|
|
* Amagai Yoshiji <amagai@osrg.net>.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/slab.h>
|
|
#include "mdt.h"
|
|
#include "alloc.h"
|
|
|
|
|
|
static inline unsigned long
|
|
nilfs_palloc_groups_per_desc_block(const struct inode *inode)
|
|
{
|
|
return (1UL << inode->i_blkbits) /
|
|
sizeof(struct nilfs_palloc_group_desc);
|
|
}
|
|
|
|
static inline unsigned long
|
|
nilfs_palloc_groups_count(const struct inode *inode)
|
|
{
|
|
return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */));
|
|
}
|
|
|
|
int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned entry_size)
|
|
{
|
|
struct nilfs_mdt_info *mi = NILFS_MDT(inode);
|
|
|
|
mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS);
|
|
if (!mi->mi_bgl)
|
|
return -ENOMEM;
|
|
|
|
bgl_lock_init(mi->mi_bgl);
|
|
|
|
nilfs_mdt_set_entry_size(inode, entry_size, 0);
|
|
|
|
mi->mi_blocks_per_group =
|
|
DIV_ROUND_UP(nilfs_palloc_entries_per_group(inode),
|
|
mi->mi_entries_per_block) + 1;
|
|
/* Number of blocks in a group including entry blocks and
|
|
a bitmap block */
|
|
mi->mi_blocks_per_desc_block =
|
|
nilfs_palloc_groups_per_desc_block(inode) *
|
|
mi->mi_blocks_per_group + 1;
|
|
/* Number of blocks per descriptor including the
|
|
descriptor block */
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long nilfs_palloc_group(const struct inode *inode, __u64 nr,
|
|
unsigned long *offset)
|
|
{
|
|
__u64 group = nr;
|
|
|
|
*offset = do_div(group, nilfs_palloc_entries_per_group(inode));
|
|
return group;
|
|
}
|
|
|
|
static unsigned long
|
|
nilfs_palloc_desc_blkoff(const struct inode *inode, unsigned long group)
|
|
{
|
|
unsigned long desc_block =
|
|
group / nilfs_palloc_groups_per_desc_block(inode);
|
|
return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block;
|
|
}
|
|
|
|
static unsigned long
|
|
nilfs_palloc_bitmap_blkoff(const struct inode *inode, unsigned long group)
|
|
{
|
|
unsigned long desc_offset =
|
|
group % nilfs_palloc_groups_per_desc_block(inode);
|
|
return nilfs_palloc_desc_blkoff(inode, group) + 1 +
|
|
desc_offset * NILFS_MDT(inode)->mi_blocks_per_group;
|
|
}
|
|
|
|
static unsigned long
|
|
nilfs_palloc_group_desc_nfrees(struct inode *inode, unsigned long group,
|
|
const struct nilfs_palloc_group_desc *desc)
|
|
{
|
|
unsigned long nfree;
|
|
|
|
spin_lock(nilfs_mdt_bgl_lock(inode, group));
|
|
nfree = le32_to_cpu(desc->pg_nfrees);
|
|
spin_unlock(nilfs_mdt_bgl_lock(inode, group));
|
|
return nfree;
|
|
}
|
|
|
|
static void
|
|
nilfs_palloc_group_desc_add_entries(struct inode *inode,
|
|
unsigned long group,
|
|
struct nilfs_palloc_group_desc *desc,
|
|
u32 n)
|
|
{
|
|
spin_lock(nilfs_mdt_bgl_lock(inode, group));
|
|
le32_add_cpu(&desc->pg_nfrees, n);
|
|
spin_unlock(nilfs_mdt_bgl_lock(inode, group));
|
|
}
|
|
|
|
static unsigned long
|
|
nilfs_palloc_entry_blkoff(const struct inode *inode, __u64 nr)
|
|
{
|
|
unsigned long group, group_offset;
|
|
|
|
group = nilfs_palloc_group(inode, nr, &group_offset);
|
|
|
|
return nilfs_palloc_bitmap_blkoff(inode, group) + 1 +
|
|
group_offset / NILFS_MDT(inode)->mi_entries_per_block;
|
|
}
|
|
|
|
static void nilfs_palloc_desc_block_init(struct inode *inode,
|
|
struct buffer_head *bh, void *kaddr)
|
|
{
|
|
struct nilfs_palloc_group_desc *desc = kaddr + bh_offset(bh);
|
|
unsigned long n = nilfs_palloc_groups_per_desc_block(inode);
|
|
__le32 nfrees;
|
|
|
|
nfrees = cpu_to_le32(nilfs_palloc_entries_per_group(inode));
|
|
while (n-- > 0) {
|
|
desc->pg_nfrees = nfrees;
|
|
desc++;
|
|
}
|
|
}
|
|
|
|
static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff,
|
|
int create,
|
|
void (*init_block)(struct inode *,
|
|
struct buffer_head *,
|
|
void *),
|
|
struct buffer_head **bhp,
|
|
struct nilfs_bh_assoc *prev,
|
|
spinlock_t *lock)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock(lock);
|
|
if (prev->bh && blkoff == prev->blkoff) {
|
|
get_bh(prev->bh);
|
|
*bhp = prev->bh;
|
|
spin_unlock(lock);
|
|
return 0;
|
|
}
|
|
spin_unlock(lock);
|
|
|
|
ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp);
|
|
if (!ret) {
|
|
spin_lock(lock);
|
|
/*
|
|
* The following code must be safe for change of the
|
|
* cache contents during the get block call.
|
|
*/
|
|
brelse(prev->bh);
|
|
get_bh(*bhp);
|
|
prev->bh = *bhp;
|
|
prev->blkoff = blkoff;
|
|
spin_unlock(lock);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_palloc_get_desc_block(struct inode *inode,
|
|
unsigned long group,
|
|
int create, struct buffer_head **bhp)
|
|
{
|
|
struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
|
|
|
|
return nilfs_palloc_get_block(inode,
|
|
nilfs_palloc_desc_blkoff(inode, group),
|
|
create, nilfs_palloc_desc_block_init,
|
|
bhp, &cache->prev_desc, &cache->lock);
|
|
}
|
|
|
|
static int nilfs_palloc_get_bitmap_block(struct inode *inode,
|
|
unsigned long group,
|
|
int create, struct buffer_head **bhp)
|
|
{
|
|
struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
|
|
|
|
return nilfs_palloc_get_block(inode,
|
|
nilfs_palloc_bitmap_blkoff(inode, group),
|
|
create, NULL, bhp,
|
|
&cache->prev_bitmap, &cache->lock);
|
|
}
|
|
|
|
int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr,
|
|
int create, struct buffer_head **bhp)
|
|
{
|
|
struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
|
|
|
|
return nilfs_palloc_get_block(inode,
|
|
nilfs_palloc_entry_blkoff(inode, nr),
|
|
create, NULL, bhp,
|
|
&cache->prev_entry, &cache->lock);
|
|
}
|
|
|
|
static struct nilfs_palloc_group_desc *
|
|
nilfs_palloc_block_get_group_desc(const struct inode *inode,
|
|
unsigned long group,
|
|
const struct buffer_head *bh, void *kaddr)
|
|
{
|
|
return (struct nilfs_palloc_group_desc *)(kaddr + bh_offset(bh)) +
|
|
group % nilfs_palloc_groups_per_desc_block(inode);
|
|
}
|
|
|
|
void *nilfs_palloc_block_get_entry(const struct inode *inode, __u64 nr,
|
|
const struct buffer_head *bh, void *kaddr)
|
|
{
|
|
unsigned long entry_offset, group_offset;
|
|
|
|
nilfs_palloc_group(inode, nr, &group_offset);
|
|
entry_offset = group_offset % NILFS_MDT(inode)->mi_entries_per_block;
|
|
|
|
return kaddr + bh_offset(bh) +
|
|
entry_offset * NILFS_MDT(inode)->mi_entry_size;
|
|
}
|
|
|
|
static int nilfs_palloc_find_available_slot(struct inode *inode,
|
|
unsigned long group,
|
|
unsigned long target,
|
|
unsigned char *bitmap,
|
|
int bsize) /* size in bits */
|
|
{
|
|
int curr, pos, end, i;
|
|
|
|
if (target > 0) {
|
|
end = (target + BITS_PER_LONG - 1) & ~(BITS_PER_LONG - 1);
|
|
if (end > bsize)
|
|
end = bsize;
|
|
pos = nilfs_find_next_zero_bit(bitmap, end, target);
|
|
if (pos < end &&
|
|
!nilfs_set_bit_atomic(
|
|
nilfs_mdt_bgl_lock(inode, group), pos, bitmap))
|
|
return pos;
|
|
} else
|
|
end = 0;
|
|
|
|
for (i = 0, curr = end;
|
|
i < bsize;
|
|
i += BITS_PER_LONG, curr += BITS_PER_LONG) {
|
|
/* wrap around */
|
|
if (curr >= bsize)
|
|
curr = 0;
|
|
while (*((unsigned long *)bitmap + curr / BITS_PER_LONG)
|
|
!= ~0UL) {
|
|
end = curr + BITS_PER_LONG;
|
|
if (end > bsize)
|
|
end = bsize;
|
|
pos = nilfs_find_next_zero_bit(bitmap, end, curr);
|
|
if ((pos < end) &&
|
|
!nilfs_set_bit_atomic(
|
|
nilfs_mdt_bgl_lock(inode, group), pos,
|
|
bitmap))
|
|
return pos;
|
|
}
|
|
}
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static unsigned long
|
|
nilfs_palloc_rest_groups_in_desc_block(const struct inode *inode,
|
|
unsigned long curr, unsigned long max)
|
|
{
|
|
return min_t(unsigned long,
|
|
nilfs_palloc_groups_per_desc_block(inode) -
|
|
curr % nilfs_palloc_groups_per_desc_block(inode),
|
|
max - curr + 1);
|
|
}
|
|
|
|
int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
struct buffer_head *desc_bh, *bitmap_bh;
|
|
struct nilfs_palloc_group_desc *desc;
|
|
unsigned char *bitmap;
|
|
void *desc_kaddr, *bitmap_kaddr;
|
|
unsigned long group, maxgroup, ngroups;
|
|
unsigned long group_offset, maxgroup_offset;
|
|
unsigned long n, entries_per_group, groups_per_desc_block;
|
|
unsigned long i, j;
|
|
int pos, ret;
|
|
|
|
ngroups = nilfs_palloc_groups_count(inode);
|
|
maxgroup = ngroups - 1;
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
|
|
entries_per_group = nilfs_palloc_entries_per_group(inode);
|
|
groups_per_desc_block = nilfs_palloc_groups_per_desc_block(inode);
|
|
|
|
for (i = 0; i < ngroups; i += n) {
|
|
if (group >= ngroups) {
|
|
/* wrap around */
|
|
group = 0;
|
|
maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr,
|
|
&maxgroup_offset) - 1;
|
|
}
|
|
ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
desc_kaddr = kmap(desc_bh->b_page);
|
|
desc = nilfs_palloc_block_get_group_desc(
|
|
inode, group, desc_bh, desc_kaddr);
|
|
n = nilfs_palloc_rest_groups_in_desc_block(inode, group,
|
|
maxgroup);
|
|
for (j = 0; j < n; j++, desc++, group++) {
|
|
if (nilfs_palloc_group_desc_nfrees(inode, group, desc)
|
|
> 0) {
|
|
ret = nilfs_palloc_get_bitmap_block(
|
|
inode, group, 1, &bitmap_bh);
|
|
if (ret < 0)
|
|
goto out_desc;
|
|
bitmap_kaddr = kmap(bitmap_bh->b_page);
|
|
bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
|
|
pos = nilfs_palloc_find_available_slot(
|
|
inode, group, group_offset, bitmap,
|
|
entries_per_group);
|
|
if (pos >= 0) {
|
|
/* found a free entry */
|
|
nilfs_palloc_group_desc_add_entries(
|
|
inode, group, desc, -1);
|
|
req->pr_entry_nr =
|
|
entries_per_group * group + pos;
|
|
kunmap(desc_bh->b_page);
|
|
kunmap(bitmap_bh->b_page);
|
|
|
|
req->pr_desc_bh = desc_bh;
|
|
req->pr_bitmap_bh = bitmap_bh;
|
|
return 0;
|
|
}
|
|
kunmap(bitmap_bh->b_page);
|
|
brelse(bitmap_bh);
|
|
}
|
|
|
|
group_offset = 0;
|
|
}
|
|
|
|
kunmap(desc_bh->b_page);
|
|
brelse(desc_bh);
|
|
}
|
|
|
|
/* no entries left */
|
|
return -ENOSPC;
|
|
|
|
out_desc:
|
|
kunmap(desc_bh->b_page);
|
|
brelse(desc_bh);
|
|
return ret;
|
|
}
|
|
|
|
void nilfs_palloc_commit_alloc_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
nilfs_mdt_mark_buffer_dirty(req->pr_bitmap_bh);
|
|
nilfs_mdt_mark_buffer_dirty(req->pr_desc_bh);
|
|
nilfs_mdt_mark_dirty(inode);
|
|
|
|
brelse(req->pr_bitmap_bh);
|
|
brelse(req->pr_desc_bh);
|
|
}
|
|
|
|
void nilfs_palloc_commit_free_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
struct nilfs_palloc_group_desc *desc;
|
|
unsigned long group, group_offset;
|
|
unsigned char *bitmap;
|
|
void *desc_kaddr, *bitmap_kaddr;
|
|
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
|
|
desc_kaddr = kmap(req->pr_desc_bh->b_page);
|
|
desc = nilfs_palloc_block_get_group_desc(inode, group,
|
|
req->pr_desc_bh, desc_kaddr);
|
|
bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
|
|
bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
|
|
|
|
if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
|
|
group_offset, bitmap))
|
|
printk(KERN_WARNING "%s: entry number %llu already freed\n",
|
|
__func__, (unsigned long long)req->pr_entry_nr);
|
|
|
|
nilfs_palloc_group_desc_add_entries(inode, group, desc, 1);
|
|
|
|
kunmap(req->pr_bitmap_bh->b_page);
|
|
kunmap(req->pr_desc_bh->b_page);
|
|
|
|
nilfs_mdt_mark_buffer_dirty(req->pr_desc_bh);
|
|
nilfs_mdt_mark_buffer_dirty(req->pr_bitmap_bh);
|
|
nilfs_mdt_mark_dirty(inode);
|
|
|
|
brelse(req->pr_bitmap_bh);
|
|
brelse(req->pr_desc_bh);
|
|
}
|
|
|
|
void nilfs_palloc_abort_alloc_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
struct nilfs_palloc_group_desc *desc;
|
|
void *desc_kaddr, *bitmap_kaddr;
|
|
unsigned char *bitmap;
|
|
unsigned long group, group_offset;
|
|
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
|
|
desc_kaddr = kmap(req->pr_desc_bh->b_page);
|
|
desc = nilfs_palloc_block_get_group_desc(inode, group,
|
|
req->pr_desc_bh, desc_kaddr);
|
|
bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
|
|
bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
|
|
if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
|
|
group_offset, bitmap))
|
|
printk(KERN_WARNING "%s: entry number %llu already freed\n",
|
|
__func__, (unsigned long long)req->pr_entry_nr);
|
|
|
|
nilfs_palloc_group_desc_add_entries(inode, group, desc, 1);
|
|
|
|
kunmap(req->pr_bitmap_bh->b_page);
|
|
kunmap(req->pr_desc_bh->b_page);
|
|
|
|
brelse(req->pr_bitmap_bh);
|
|
brelse(req->pr_desc_bh);
|
|
|
|
req->pr_entry_nr = 0;
|
|
req->pr_bitmap_bh = NULL;
|
|
req->pr_desc_bh = NULL;
|
|
}
|
|
|
|
int nilfs_palloc_prepare_free_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
struct buffer_head *desc_bh, *bitmap_bh;
|
|
unsigned long group, group_offset;
|
|
int ret;
|
|
|
|
group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
|
|
ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = nilfs_palloc_get_bitmap_block(inode, group, 1, &bitmap_bh);
|
|
if (ret < 0) {
|
|
brelse(desc_bh);
|
|
return ret;
|
|
}
|
|
|
|
req->pr_desc_bh = desc_bh;
|
|
req->pr_bitmap_bh = bitmap_bh;
|
|
return 0;
|
|
}
|
|
|
|
void nilfs_palloc_abort_free_entry(struct inode *inode,
|
|
struct nilfs_palloc_req *req)
|
|
{
|
|
brelse(req->pr_bitmap_bh);
|
|
brelse(req->pr_desc_bh);
|
|
|
|
req->pr_entry_nr = 0;
|
|
req->pr_bitmap_bh = NULL;
|
|
req->pr_desc_bh = NULL;
|
|
}
|
|
|
|
static int
|
|
nilfs_palloc_group_is_in(struct inode *inode, unsigned long group, __u64 nr)
|
|
{
|
|
__u64 first, last;
|
|
|
|
first = group * nilfs_palloc_entries_per_group(inode);
|
|
last = first + nilfs_palloc_entries_per_group(inode) - 1;
|
|
return (nr >= first) && (nr <= last);
|
|
}
|
|
|
|
int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
|
|
{
|
|
struct buffer_head *desc_bh, *bitmap_bh;
|
|
struct nilfs_palloc_group_desc *desc;
|
|
unsigned char *bitmap;
|
|
void *desc_kaddr, *bitmap_kaddr;
|
|
unsigned long group, group_offset;
|
|
int i, j, n, ret;
|
|
|
|
for (i = 0; i < nitems; i += n) {
|
|
group = nilfs_palloc_group(inode, entry_nrs[i], &group_offset);
|
|
ret = nilfs_palloc_get_desc_block(inode, group, 0, &desc_bh);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = nilfs_palloc_get_bitmap_block(inode, group, 0,
|
|
&bitmap_bh);
|
|
if (ret < 0) {
|
|
brelse(desc_bh);
|
|
return ret;
|
|
}
|
|
desc_kaddr = kmap(desc_bh->b_page);
|
|
desc = nilfs_palloc_block_get_group_desc(
|
|
inode, group, desc_bh, desc_kaddr);
|
|
bitmap_kaddr = kmap(bitmap_bh->b_page);
|
|
bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
|
|
for (j = i, n = 0;
|
|
(j < nitems) && nilfs_palloc_group_is_in(inode, group,
|
|
entry_nrs[j]);
|
|
j++, n++) {
|
|
nilfs_palloc_group(inode, entry_nrs[j], &group_offset);
|
|
if (!nilfs_clear_bit_atomic(
|
|
nilfs_mdt_bgl_lock(inode, group),
|
|
group_offset, bitmap)) {
|
|
printk(KERN_WARNING
|
|
"%s: entry number %llu already freed\n",
|
|
__func__,
|
|
(unsigned long long)entry_nrs[j]);
|
|
}
|
|
}
|
|
nilfs_palloc_group_desc_add_entries(inode, group, desc, n);
|
|
|
|
kunmap(bitmap_bh->b_page);
|
|
kunmap(desc_bh->b_page);
|
|
|
|
nilfs_mdt_mark_buffer_dirty(desc_bh);
|
|
nilfs_mdt_mark_buffer_dirty(bitmap_bh);
|
|
nilfs_mdt_mark_dirty(inode);
|
|
|
|
brelse(bitmap_bh);
|
|
brelse(desc_bh);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void nilfs_palloc_setup_cache(struct inode *inode,
|
|
struct nilfs_palloc_cache *cache)
|
|
{
|
|
NILFS_MDT(inode)->mi_palloc_cache = cache;
|
|
spin_lock_init(&cache->lock);
|
|
}
|
|
|
|
void nilfs_palloc_clear_cache(struct inode *inode)
|
|
{
|
|
struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
|
|
|
|
spin_lock(&cache->lock);
|
|
brelse(cache->prev_desc.bh);
|
|
brelse(cache->prev_bitmap.bh);
|
|
brelse(cache->prev_entry.bh);
|
|
cache->prev_desc.bh = NULL;
|
|
cache->prev_bitmap.bh = NULL;
|
|
cache->prev_entry.bh = NULL;
|
|
spin_unlock(&cache->lock);
|
|
}
|
|
|
|
void nilfs_palloc_destroy_cache(struct inode *inode)
|
|
{
|
|
nilfs_palloc_clear_cache(inode);
|
|
NILFS_MDT(inode)->mi_palloc_cache = NULL;
|
|
}
|