77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/*
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* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/spinlock.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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#include "../internal.h"
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void ecryptfs_drop_pagecache_sb(struct super_block *sb, void *unused)
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{
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struct inode *inode, *toput_inode = NULL;
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spin_lock(&inode_sb_list_lock);
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list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
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spin_lock(&inode->i_lock);
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if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
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(inode->i_mapping->nrpages == 0)) {
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spin_unlock(&inode->i_lock);
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continue;
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}
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__iget(inode);
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spin_unlock(&inode->i_lock);
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spin_unlock(&inode_sb_list_lock);
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invalidate_mapping_pages(inode->i_mapping, 0, -1);
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iput(toput_inode);
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toput_inode = inode;
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spin_lock(&inode_sb_list_lock);
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}
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spin_unlock(&inode_sb_list_lock);
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iput(toput_inode);
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}
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void clean_inode_pages(struct address_space *mapping,
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pgoff_t start, pgoff_t end)
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{
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struct pagevec pvec;
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pgoff_t index = start;
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int i;
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pagevec_init(&pvec, 0);
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while (index <= end && pagevec_lookup(&pvec, mapping, index,
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min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
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for (i = 0; i < pagevec_count(&pvec); i++) {
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struct page *page = pvec.pages[i];
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/**
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* We rely upon deletion
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* not changing page->index
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*/
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index = page->index;
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if (index > end)
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break;
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if (!trylock_page(page))
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continue;
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WARN_ON(page->index != index);
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zero_user(page, 0, PAGE_CACHE_SIZE);
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unlock_page(page);
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}
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pagevec_release(&pvec);
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cond_resched();
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index++;
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}
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}
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