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![Jaegeuk Kim](/assets/img/avatar_default.png)
This patch adds f2fs_bmap operation to the data address space. This enables f2fs to support swapfile. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
718 lines
17 KiB
C
718 lines
17 KiB
C
/*
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* fs/f2fs/data.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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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 as
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* published by the Free Software Foundation.
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include <linux/buffer_head.h>
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#include <linux/mpage.h>
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#include <linux/writeback.h>
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#include <linux/backing-dev.h>
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#include <linux/blkdev.h>
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#include <linux/bio.h>
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#include <linux/prefetch.h>
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#include "f2fs.h"
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#include "node.h"
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#include "segment.h"
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/*
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* Lock ordering for the change of data block address:
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* ->data_page
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* ->node_page
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* update block addresses in the node page
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*/
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static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr)
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{
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struct f2fs_node *rn;
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__le32 *addr_array;
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struct page *node_page = dn->node_page;
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unsigned int ofs_in_node = dn->ofs_in_node;
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wait_on_page_writeback(node_page);
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rn = (struct f2fs_node *)page_address(node_page);
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/* Get physical address of data block */
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addr_array = blkaddr_in_node(rn);
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addr_array[ofs_in_node] = cpu_to_le32(new_addr);
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set_page_dirty(node_page);
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}
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int reserve_new_block(struct dnode_of_data *dn)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
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if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))
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return -EPERM;
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if (!inc_valid_block_count(sbi, dn->inode, 1))
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return -ENOSPC;
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__set_data_blkaddr(dn, NEW_ADDR);
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dn->data_blkaddr = NEW_ADDR;
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sync_inode_page(dn);
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return 0;
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}
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static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
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struct buffer_head *bh_result)
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{
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struct f2fs_inode_info *fi = F2FS_I(inode);
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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pgoff_t start_fofs, end_fofs;
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block_t start_blkaddr;
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read_lock(&fi->ext.ext_lock);
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if (fi->ext.len == 0) {
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read_unlock(&fi->ext.ext_lock);
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return 0;
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}
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sbi->total_hit_ext++;
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start_fofs = fi->ext.fofs;
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end_fofs = fi->ext.fofs + fi->ext.len - 1;
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start_blkaddr = fi->ext.blk_addr;
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if (pgofs >= start_fofs && pgofs <= end_fofs) {
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unsigned int blkbits = inode->i_sb->s_blocksize_bits;
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size_t count;
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clear_buffer_new(bh_result);
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map_bh(bh_result, inode->i_sb,
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start_blkaddr + pgofs - start_fofs);
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count = end_fofs - pgofs + 1;
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if (count < (UINT_MAX >> blkbits))
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bh_result->b_size = (count << blkbits);
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else
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bh_result->b_size = UINT_MAX;
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sbi->read_hit_ext++;
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read_unlock(&fi->ext.ext_lock);
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return 1;
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}
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read_unlock(&fi->ext.ext_lock);
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return 0;
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}
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void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn)
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{
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struct f2fs_inode_info *fi = F2FS_I(dn->inode);
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pgoff_t fofs, start_fofs, end_fofs;
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block_t start_blkaddr, end_blkaddr;
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BUG_ON(blk_addr == NEW_ADDR);
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fofs = start_bidx_of_node(ofs_of_node(dn->node_page)) + dn->ofs_in_node;
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/* Update the page address in the parent node */
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__set_data_blkaddr(dn, blk_addr);
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write_lock(&fi->ext.ext_lock);
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start_fofs = fi->ext.fofs;
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end_fofs = fi->ext.fofs + fi->ext.len - 1;
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start_blkaddr = fi->ext.blk_addr;
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end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1;
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/* Drop and initialize the matched extent */
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if (fi->ext.len == 1 && fofs == start_fofs)
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fi->ext.len = 0;
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/* Initial extent */
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if (fi->ext.len == 0) {
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if (blk_addr != NULL_ADDR) {
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fi->ext.fofs = fofs;
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fi->ext.blk_addr = blk_addr;
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fi->ext.len = 1;
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}
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goto end_update;
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}
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/* Frone merge */
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if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) {
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fi->ext.fofs--;
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fi->ext.blk_addr--;
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fi->ext.len++;
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goto end_update;
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}
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/* Back merge */
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if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) {
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fi->ext.len++;
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goto end_update;
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}
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/* Split the existing extent */
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if (fi->ext.len > 1 &&
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fofs >= start_fofs && fofs <= end_fofs) {
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if ((end_fofs - fofs) < (fi->ext.len >> 1)) {
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fi->ext.len = fofs - start_fofs;
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} else {
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fi->ext.fofs = fofs + 1;
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fi->ext.blk_addr = start_blkaddr +
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fofs - start_fofs + 1;
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fi->ext.len -= fofs - start_fofs + 1;
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}
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goto end_update;
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}
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write_unlock(&fi->ext.ext_lock);
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return;
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end_update:
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write_unlock(&fi->ext.ext_lock);
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sync_inode_page(dn);
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return;
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}
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struct page *find_data_page(struct inode *inode, pgoff_t index)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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struct address_space *mapping = inode->i_mapping;
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struct dnode_of_data dn;
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struct page *page;
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int err;
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page = find_get_page(mapping, index);
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if (page && PageUptodate(page))
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return page;
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f2fs_put_page(page, 0);
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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err = get_dnode_of_data(&dn, index, RDONLY_NODE);
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if (err)
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return ERR_PTR(err);
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f2fs_put_dnode(&dn);
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if (dn.data_blkaddr == NULL_ADDR)
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return ERR_PTR(-ENOENT);
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/* By fallocate(), there is no cached page, but with NEW_ADDR */
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if (dn.data_blkaddr == NEW_ADDR)
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return ERR_PTR(-EINVAL);
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page = grab_cache_page(mapping, index);
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if (!page)
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return ERR_PTR(-ENOMEM);
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err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC);
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if (err) {
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f2fs_put_page(page, 1);
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return ERR_PTR(err);
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}
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unlock_page(page);
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return page;
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}
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/*
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* If it tries to access a hole, return an error.
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* Because, the callers, functions in dir.c and GC, should be able to know
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* whether this page exists or not.
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*/
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struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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struct address_space *mapping = inode->i_mapping;
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struct dnode_of_data dn;
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struct page *page;
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int err;
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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err = get_dnode_of_data(&dn, index, RDONLY_NODE);
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if (err)
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return ERR_PTR(err);
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f2fs_put_dnode(&dn);
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if (dn.data_blkaddr == NULL_ADDR)
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return ERR_PTR(-ENOENT);
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page = grab_cache_page(mapping, index);
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if (!page)
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return ERR_PTR(-ENOMEM);
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if (PageUptodate(page))
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return page;
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BUG_ON(dn.data_blkaddr == NEW_ADDR);
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BUG_ON(dn.data_blkaddr == NULL_ADDR);
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err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC);
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if (err) {
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f2fs_put_page(page, 1);
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return ERR_PTR(err);
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}
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return page;
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}
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/*
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* Caller ensures that this data page is never allocated.
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* A new zero-filled data page is allocated in the page cache.
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*/
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struct page *get_new_data_page(struct inode *inode, pgoff_t index,
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bool new_i_size)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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struct address_space *mapping = inode->i_mapping;
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struct page *page;
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struct dnode_of_data dn;
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int err;
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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err = get_dnode_of_data(&dn, index, 0);
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if (err)
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return ERR_PTR(err);
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if (dn.data_blkaddr == NULL_ADDR) {
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if (reserve_new_block(&dn)) {
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f2fs_put_dnode(&dn);
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return ERR_PTR(-ENOSPC);
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}
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}
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f2fs_put_dnode(&dn);
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page = grab_cache_page(mapping, index);
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if (!page)
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return ERR_PTR(-ENOMEM);
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if (PageUptodate(page))
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return page;
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if (dn.data_blkaddr == NEW_ADDR) {
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zero_user_segment(page, 0, PAGE_CACHE_SIZE);
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} else {
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err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC);
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if (err) {
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f2fs_put_page(page, 1);
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return ERR_PTR(err);
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}
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}
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SetPageUptodate(page);
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if (new_i_size &&
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i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) {
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i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT));
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mark_inode_dirty_sync(inode);
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}
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return page;
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}
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static void read_end_io(struct bio *bio, int err)
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{
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const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
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struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
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do {
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struct page *page = bvec->bv_page;
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if (--bvec >= bio->bi_io_vec)
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prefetchw(&bvec->bv_page->flags);
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if (uptodate) {
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SetPageUptodate(page);
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} else {
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ClearPageUptodate(page);
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SetPageError(page);
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}
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unlock_page(page);
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} while (bvec >= bio->bi_io_vec);
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kfree(bio->bi_private);
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bio_put(bio);
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}
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/*
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* Fill the locked page with data located in the block address.
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* Read operation is synchronous, and caller must unlock the page.
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*/
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int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page,
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block_t blk_addr, int type)
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{
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struct block_device *bdev = sbi->sb->s_bdev;
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bool sync = (type == READ_SYNC);
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struct bio *bio;
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/* This page can be already read by other threads */
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if (PageUptodate(page)) {
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if (!sync)
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unlock_page(page);
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return 0;
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}
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down_read(&sbi->bio_sem);
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/* Allocate a new bio */
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bio = f2fs_bio_alloc(bdev, 1);
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/* Initialize the bio */
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bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
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bio->bi_end_io = read_end_io;
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if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
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kfree(bio->bi_private);
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bio_put(bio);
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up_read(&sbi->bio_sem);
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return -EFAULT;
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}
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submit_bio(type, bio);
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up_read(&sbi->bio_sem);
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/* wait for read completion if sync */
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if (sync) {
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lock_page(page);
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if (PageError(page))
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return -EIO;
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}
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return 0;
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}
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/*
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* This function should be used by the data read flow only where it
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* does not check the "create" flag that indicates block allocation.
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* The reason for this special functionality is to exploit VFS readahead
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* mechanism.
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*/
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static int get_data_block_ro(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create)
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{
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unsigned int blkbits = inode->i_sb->s_blocksize_bits;
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unsigned maxblocks = bh_result->b_size >> blkbits;
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struct dnode_of_data dn;
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pgoff_t pgofs;
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int err;
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/* Get the page offset from the block offset(iblock) */
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pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));
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if (check_extent_cache(inode, pgofs, bh_result))
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return 0;
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/* When reading holes, we need its node page */
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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err = get_dnode_of_data(&dn, pgofs, RDONLY_NODE);
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if (err)
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return (err == -ENOENT) ? 0 : err;
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/* It does not support data allocation */
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BUG_ON(create);
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if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) {
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int i;
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unsigned int end_offset;
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end_offset = IS_INODE(dn.node_page) ?
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ADDRS_PER_INODE :
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ADDRS_PER_BLOCK;
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clear_buffer_new(bh_result);
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/* Give more consecutive addresses for the read ahead */
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for (i = 0; i < end_offset - dn.ofs_in_node; i++)
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if (((datablock_addr(dn.node_page,
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dn.ofs_in_node + i))
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!= (dn.data_blkaddr + i)) || maxblocks == i)
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break;
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map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
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bh_result->b_size = (i << blkbits);
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}
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f2fs_put_dnode(&dn);
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return 0;
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}
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static int f2fs_read_data_page(struct file *file, struct page *page)
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{
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return mpage_readpage(page, get_data_block_ro);
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}
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static int f2fs_read_data_pages(struct file *file,
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struct address_space *mapping,
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struct list_head *pages, unsigned nr_pages)
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{
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return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro);
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}
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int do_write_data_page(struct page *page)
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{
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struct inode *inode = page->mapping->host;
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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block_t old_blk_addr, new_blk_addr;
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struct dnode_of_data dn;
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int err = 0;
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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err = get_dnode_of_data(&dn, page->index, RDONLY_NODE);
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if (err)
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return err;
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old_blk_addr = dn.data_blkaddr;
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/* This page is already truncated */
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if (old_blk_addr == NULL_ADDR)
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goto out_writepage;
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set_page_writeback(page);
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/*
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* If current allocation needs SSR,
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* it had better in-place writes for updated data.
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*/
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if (old_blk_addr != NEW_ADDR && !is_cold_data(page) &&
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need_inplace_update(inode)) {
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rewrite_data_page(F2FS_SB(inode->i_sb), page,
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old_blk_addr);
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} else {
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write_data_page(inode, page, &dn,
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old_blk_addr, &new_blk_addr);
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update_extent_cache(new_blk_addr, &dn);
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F2FS_I(inode)->data_version =
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le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver);
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}
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out_writepage:
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f2fs_put_dnode(&dn);
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return err;
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}
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static int f2fs_write_data_page(struct page *page,
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struct writeback_control *wbc)
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{
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struct inode *inode = page->mapping->host;
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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loff_t i_size = i_size_read(inode);
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const pgoff_t end_index = ((unsigned long long) i_size)
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>> PAGE_CACHE_SHIFT;
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unsigned offset;
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int err = 0;
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if (page->index < end_index)
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goto out;
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/*
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* If the offset is out-of-range of file size,
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* this page does not have to be written to disk.
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*/
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offset = i_size & (PAGE_CACHE_SIZE - 1);
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if ((page->index >= end_index + 1) || !offset) {
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if (S_ISDIR(inode->i_mode)) {
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dec_page_count(sbi, F2FS_DIRTY_DENTS);
|
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inode_dec_dirty_dents(inode);
|
|
}
|
|
goto unlock_out;
|
|
}
|
|
|
|
zero_user_segment(page, offset, PAGE_CACHE_SIZE);
|
|
out:
|
|
if (sbi->por_doing)
|
|
goto redirty_out;
|
|
|
|
if (wbc->for_reclaim && !S_ISDIR(inode->i_mode) && !is_cold_data(page))
|
|
goto redirty_out;
|
|
|
|
mutex_lock_op(sbi, DATA_WRITE);
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
dec_page_count(sbi, F2FS_DIRTY_DENTS);
|
|
inode_dec_dirty_dents(inode);
|
|
}
|
|
err = do_write_data_page(page);
|
|
if (err && err != -ENOENT) {
|
|
wbc->pages_skipped++;
|
|
set_page_dirty(page);
|
|
}
|
|
mutex_unlock_op(sbi, DATA_WRITE);
|
|
|
|
if (wbc->for_reclaim)
|
|
f2fs_submit_bio(sbi, DATA, true);
|
|
|
|
if (err == -ENOENT)
|
|
goto unlock_out;
|
|
|
|
clear_cold_data(page);
|
|
unlock_page(page);
|
|
|
|
if (!wbc->for_reclaim && !S_ISDIR(inode->i_mode))
|
|
f2fs_balance_fs(sbi);
|
|
return 0;
|
|
|
|
unlock_out:
|
|
unlock_page(page);
|
|
return (err == -ENOENT) ? 0 : err;
|
|
|
|
redirty_out:
|
|
wbc->pages_skipped++;
|
|
set_page_dirty(page);
|
|
return AOP_WRITEPAGE_ACTIVATE;
|
|
}
|
|
|
|
#define MAX_DESIRED_PAGES_WP 4096
|
|
|
|
static int __f2fs_writepage(struct page *page, struct writeback_control *wbc,
|
|
void *data)
|
|
{
|
|
struct address_space *mapping = data;
|
|
int ret = mapping->a_ops->writepage(page, wbc);
|
|
mapping_set_error(mapping, ret);
|
|
return ret;
|
|
}
|
|
|
|
static int f2fs_write_data_pages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
int ret;
|
|
long excess_nrtw = 0, desired_nrtw;
|
|
|
|
if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) {
|
|
desired_nrtw = MAX_DESIRED_PAGES_WP;
|
|
excess_nrtw = desired_nrtw - wbc->nr_to_write;
|
|
wbc->nr_to_write = desired_nrtw;
|
|
}
|
|
|
|
if (!S_ISDIR(inode->i_mode))
|
|
mutex_lock(&sbi->writepages);
|
|
ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping);
|
|
if (!S_ISDIR(inode->i_mode))
|
|
mutex_unlock(&sbi->writepages);
|
|
f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL));
|
|
|
|
remove_dirty_dir_inode(inode);
|
|
|
|
wbc->nr_to_write -= excess_nrtw;
|
|
return ret;
|
|
}
|
|
|
|
static int f2fs_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
struct page *page;
|
|
pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT;
|
|
struct dnode_of_data dn;
|
|
int err = 0;
|
|
|
|
/* for nobh_write_end */
|
|
*fsdata = NULL;
|
|
|
|
f2fs_balance_fs(sbi);
|
|
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
*pagep = page;
|
|
|
|
mutex_lock_op(sbi, DATA_NEW);
|
|
|
|
set_new_dnode(&dn, inode, NULL, NULL, 0);
|
|
err = get_dnode_of_data(&dn, index, 0);
|
|
if (err) {
|
|
mutex_unlock_op(sbi, DATA_NEW);
|
|
f2fs_put_page(page, 1);
|
|
return err;
|
|
}
|
|
|
|
if (dn.data_blkaddr == NULL_ADDR) {
|
|
err = reserve_new_block(&dn);
|
|
if (err) {
|
|
f2fs_put_dnode(&dn);
|
|
mutex_unlock_op(sbi, DATA_NEW);
|
|
f2fs_put_page(page, 1);
|
|
return err;
|
|
}
|
|
}
|
|
f2fs_put_dnode(&dn);
|
|
|
|
mutex_unlock_op(sbi, DATA_NEW);
|
|
|
|
if ((len == PAGE_CACHE_SIZE) || PageUptodate(page))
|
|
return 0;
|
|
|
|
if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) {
|
|
unsigned start = pos & (PAGE_CACHE_SIZE - 1);
|
|
unsigned end = start + len;
|
|
|
|
/* Reading beyond i_size is simple: memset to zero */
|
|
zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
if (dn.data_blkaddr == NEW_ADDR) {
|
|
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
|
|
} else {
|
|
err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC);
|
|
if (err) {
|
|
f2fs_put_page(page, 1);
|
|
return err;
|
|
}
|
|
}
|
|
SetPageUptodate(page);
|
|
clear_cold_data(page);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
|
|
const struct iovec *iov, loff_t offset, unsigned long nr_segs)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
if (rw == WRITE)
|
|
return 0;
|
|
|
|
/* Needs synchronization with the cleaner */
|
|
return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
|
|
get_data_block_ro);
|
|
}
|
|
|
|
static void f2fs_invalidate_data_page(struct page *page, unsigned long offset)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
if (S_ISDIR(inode->i_mode) && PageDirty(page)) {
|
|
dec_page_count(sbi, F2FS_DIRTY_DENTS);
|
|
inode_dec_dirty_dents(inode);
|
|
}
|
|
ClearPagePrivate(page);
|
|
}
|
|
|
|
static int f2fs_release_data_page(struct page *page, gfp_t wait)
|
|
{
|
|
ClearPagePrivate(page);
|
|
return 0;
|
|
}
|
|
|
|
static int f2fs_set_data_page_dirty(struct page *page)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
struct inode *inode = mapping->host;
|
|
|
|
SetPageUptodate(page);
|
|
if (!PageDirty(page)) {
|
|
__set_page_dirty_nobuffers(page);
|
|
set_dirty_dir_page(inode, page);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
|
|
{
|
|
return generic_block_bmap(mapping, block, get_data_block_ro);
|
|
}
|
|
|
|
const struct address_space_operations f2fs_dblock_aops = {
|
|
.readpage = f2fs_read_data_page,
|
|
.readpages = f2fs_read_data_pages,
|
|
.writepage = f2fs_write_data_page,
|
|
.writepages = f2fs_write_data_pages,
|
|
.write_begin = f2fs_write_begin,
|
|
.write_end = nobh_write_end,
|
|
.set_page_dirty = f2fs_set_data_page_dirty,
|
|
.invalidatepage = f2fs_invalidate_data_page,
|
|
.releasepage = f2fs_release_data_page,
|
|
.direct_IO = f2fs_direct_IO,
|
|
.bmap = f2fs_bmap,
|
|
};
|