/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#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 - NM_I(sbi)->dirty_nat_cnt;
}

static unsigned long __count_free_nids(struct f2fs_sb_info *sbi)
{
	if (NM_I(sbi)->fcnt > MAX_FREE_NIDS)
		return NM_I(sbi)->fcnt - MAX_FREE_NIDS;
	return 0;
}

static unsigned long __count_extent_cache(struct f2fs_sb_info *sbi)
{
	return atomic_read(&sbi->total_zombie_tree) +
				atomic_read(&sbi->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 extent cache entries */
		count += __count_extent_cache(sbi);

		/* shrink 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;
}

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_extent_tree(sbi, nr >> 1);

		/* shrink clean nat cache entries */
		if (freed < nr)
			freed += try_to_free_nats(sbi, nr - freed);

		/* shrink free nids cache entries */
		if (freed < nr)
			freed += 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;
}

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_extent_tree(sbi, __count_extent_cache(sbi));

	spin_lock(&f2fs_list_lock);
	list_del(&sbi->s_list);
	spin_unlock(&f2fs_list_lock);
}
trl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Kalle Valo &lt;kvalo@codeaurora.org&gt;</td><td class='right'>2017-01-27 14:19:25 +0200</td></tr>
<tr><th>committer</th><td>Kalle Valo &lt;kvalo@codeaurora.org&gt;</td><td class='right'>2017-01-28 09:15:50 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/nfsd/nfs3proc.c?id=2b1d530cb3157f828fcaadd259613f59db3c6d1c'>2b1d530cb3157f828fcaadd259613f59db3c6d1c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/fs/nfsd/nfs3proc.c?id=2b1d530cb3157f828fcaadd259613f59db3c6d1c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=2b1d530cb3157f828fcaadd259613f59db3c6d1c'>fb5dfe8f2e6956f54377c7275f330cd158ead259</a> /<a href='/cgit.cgi/linux/net-next.git/tree/fs/nfsd/nfs3proc.c?id=2b1d530cb3157f828fcaadd259613f59db3c6d1c'>fs/nfsd/nfs3proc.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/nfsd/nfs3proc.c?id=bd19b5ab1da654de456e102250822ec06311d6ad'>bd19b5ab1da654de456e102250822ec06311d6ad</a> (<a href='/cgit.cgi/linux/net-next.git/diff/fs/nfsd/nfs3proc.c?id=2b1d530cb3157f828fcaadd259613f59db3c6d1c&amp;id2=bd19b5ab1da654de456e102250822ec06311d6ad'>diff</a>)</td></tr></table>
<div class='commit-subject'>MAINTAINERS: ath9k-devel is closed</div><div class='commit-msg'>ath9k-devel list is now closed, only linux-wireless should be used.

Reported-by: Michael Renzmann &lt;mrenzmann@madwifi-project.org&gt;
Signed-off-by: Kalle Valo &lt;kvalo@codeaurora.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=2b1d530cb3157f828fcaadd259613f59db3c6d1c'>Diffstat</a> (limited to 'fs/nfsd/nfs3proc.c')</div><table summary='diffstat' class='diffstat'>