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// SPDX-License-Identifier: GPL-2.0
/*
* f2fs shrinker support
* the basic infra was copied from fs/ubifs/shrinker.c
*
* Copyright (c) 2015 Motorola Mobility
* Copyright (c) 2015 Jaegeuk Kim <jaegeuk@kernel.org>
*/
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include "f2fs.h"
#include "node.h"
static LIST_HEAD(f2fs_list);
static DEFINE_SPINLOCK(f2fs_list_lock);
static unsigned int shrinker_run_no;
static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi)
{
return NM_I(sbi)->nat_cnt[RECLAIMABLE_NAT];
}
static unsigned long __count_free_nids(struct f2fs_sb_info *sbi)
{
long count = NM_I(sbi)->nid_cnt[FREE_NID] - MAX_FREE_NIDS;
return count > 0 ? count : 0;
}
static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi,
enum extent_type type)
{
struct extent_tree_info *eti = &sbi->extent_tree[type];
return atomic_read(&eti->total_zombie_tree) +
atomic_read(&eti->total_ext_node);
}
unsigned long f2fs_shrink_count(struct shrinker *shrink,
struct shrink_control *sc)
{
struct f2fs_sb_info *sbi;
struct list_head *p;
unsigned long count = 0;
spin_lock(&f2fs_list_lock);
p = f2fs_list.next;
while (p != &f2fs_list) {
sbi = list_entry(p, struct f2fs_sb_info, s_list);
/* stop f2fs_put_super */
if (!mutex_trylock(&sbi->umount_mutex)) {
p = p->next;
continue;
}
spin_unlock(&f2fs_list_lock);
/* count read extent cache entries */
count += __count_extent_cache(sbi, EX_READ);
/* count block age extent cache entries */
count += __count_extent_cache(sbi, EX_BLOCK_AGE);
/* count clean nat cache entries */
count += __count_nat_entries(sbi);
/* count free nids cache entries */
count += __count_free_nids(sbi);
spin_lock(&f2fs_list_lock);
p = p->next;
mutex_unlock(&sbi->umount_mutex);
}
spin_unlock(&f2fs_list_lock);
return count ?: SHRINK_EMPTY;
}
unsigned long f2fs_shrink_scan(struct shrinker *shrink,
struct shrink_control *sc)
{
unsigned long nr = sc->nr_to_scan;
struct f2fs_sb_info *sbi;
struct list_head *p;
unsigned int run_no;
unsigned long freed = 0;
spin_lock(&f2fs_list_lock);
do {
run_no = ++shrinker_run_no;
} while (run_no == 0);
p = f2fs_list.next;
while (p != &f2fs_list) {
sbi = list_entry(p, struct f2fs_sb_info, s_list);
if (sbi->shrinker_run_no == run_no)
break;
/* stop f2fs_put_super */
if (!mutex_trylock(&sbi->umount_mutex)) {
p = p->next;
continue;
}
spin_unlock(&f2fs_list_lock);
sbi->shrinker_run_no = run_no;
/* shrink extent cache entries */
freed += f2fs_shrink_age_extent_tree(sbi, nr >> 2);
/* shrink read extent cache entries */
freed += f2fs_shrink_read_extent_tree(sbi, nr >> 2);
/* shrink clean nat cache entries */
if (freed < nr)
freed += f2fs_try_to_free_nats(sbi, nr - freed);
/* shrink free nids cache entries */
if (freed < nr)
freed += f2fs_try_to_free_nids(sbi, nr - freed);
spin_lock(&f2fs_list_lock);
p = p->next;
list_move_tail(&sbi->s_list, &f2fs_list);
mutex_unlock(&sbi->umount_mutex);
if (freed >= nr)
break;
}
spin_unlock(&f2fs_list_lock);
return freed;
}
unsigned int f2fs_donate_files(void)
{
struct f2fs_sb_info *sbi;
struct list_head *p;
unsigned int donate_files = 0;
spin_lock(&f2fs_list_lock);
p = f2fs_list.next;
while (p != &f2fs_list) {
sbi = list_entry(p, struct f2fs_sb_info, s_list);
/* stop f2fs_put_super */
if (!mutex_trylock(&sbi->umount_mutex)) {
p = p->next;
continue;
}
spin_unlock(&f2fs_list_lock);
donate_files += sbi->donate_files;
spin_lock(&f2fs_list_lock);
p = p->next;
mutex_unlock(&sbi->umount_mutex);
}
spin_unlock(&f2fs_list_lock);
return donate_files;
}
static unsigned int do_reclaim_caches(struct f2fs_sb_info *sbi,
unsigned int reclaim_caches_kb)
{
struct inode *inode;
struct f2fs_inode_info *fi;
unsigned int nfiles = sbi->donate_files;
pgoff_t npages = reclaim_caches_kb >> (PAGE_SHIFT - 10);
while (npages && nfiles--) {
pgoff_t len;
spin_lock(&sbi->inode_lock[DONATE_INODE]);
if (list_empty(&sbi->inode_list[DONATE_INODE])) {
spin_unlock(&sbi->inode_lock[DONATE_INODE]);
break;
}
fi = list_first_entry(&sbi->inode_list[DONATE_INODE],
struct f2fs_inode_info, gdonate_list);
list_move_tail(&fi->gdonate_list, &sbi->inode_list[DONATE_INODE]);
inode = igrab(&fi->vfs_inode);
spin_unlock(&sbi->inode_lock[DONATE_INODE]);
if (!inode)
continue;
len = fi->donate_end - fi->donate_start + 1;
npages = npages < len ? 0 : npages - len;
invalidate_inode_pages2_range(inode->i_mapping,
fi->donate_start, fi->donate_end);
iput(inode);
cond_resched();
}
return npages << (PAGE_SHIFT - 10);
}
void f2fs_reclaim_caches(unsigned int reclaim_caches_kb)
{
struct f2fs_sb_info *sbi;
struct list_head *p;
spin_lock(&f2fs_list_lock);
p = f2fs_list.next;
while (p != &f2fs_list && reclaim_caches_kb) {
sbi = list_entry(p, struct f2fs_sb_info, s_list);
/* stop f2fs_put_super */
if (!mutex_trylock(&sbi->umount_mutex)) {
p = p->next;
continue;
}
spin_unlock(&f2fs_list_lock);
reclaim_caches_kb = do_reclaim_caches(sbi, reclaim_caches_kb);
spin_lock(&f2fs_list_lock);
p = p->next;
mutex_unlock(&sbi->umount_mutex);
}
spin_unlock(&f2fs_list_lock);
}
void f2fs_join_shrinker(struct f2fs_sb_info *sbi)
{
spin_lock(&f2fs_list_lock);
list_add_tail(&sbi->s_list, &f2fs_list);
spin_unlock(&f2fs_list_lock);
}
void f2fs_leave_shrinker(struct f2fs_sb_info *sbi)
{
f2fs_shrink_read_extent_tree(sbi, __count_extent_cache(sbi, EX_READ));
f2fs_shrink_age_extent_tree(sbi,
__count_extent_cache(sbi, EX_BLOCK_AGE));
spin_lock(&f2fs_list_lock);
list_del_init(&sbi->s_list);
spin_unlock(&f2fs_list_lock);
}
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