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88b88a6679
This patch introduces a very limited functionality for atomic write support. In order to support atomic write, this patch adds two ioctls: o F2FS_IOC_START_ATOMIC_WRITE o F2FS_IOC_COMMIT_ATOMIC_WRITE The database engine should be aware of the following sequence. 1. open -> ioctl(F2FS_IOC_START_ATOMIC_WRITE); 2. writes : all the written data will be treated as atomic pages. 3. commit -> ioctl(F2FS_IOC_COMMIT_ATOMIC_WRITE); : this flushes all the data blocks to the disk, which will be shown all or nothing by f2fs recovery procedure. 4. repeat to #2. The IO pattens should be: ,- START_ATOMIC_WRITE ,- COMMIT_ATOMIC_WRITE CP | D D D D D D | FSYNC | D D D D | FSYNC ... `- COMMIT_ATOMIC_WRITE Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
260 lines
6.2 KiB
C
260 lines
6.2 KiB
C
/*
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* fs/f2fs/inline.c
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* Copyright (c) 2013, Intel Corporation
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* Authors: Huajun Li <huajun.li@intel.com>
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* Haicheng Li <haicheng.li@intel.com>
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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 "f2fs.h"
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bool f2fs_may_inline(struct inode *inode)
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{
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block_t nr_blocks;
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loff_t i_size;
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if (!test_opt(F2FS_I_SB(inode), INLINE_DATA))
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return false;
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if (f2fs_is_atomic_file(inode))
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return false;
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nr_blocks = F2FS_I(inode)->i_xattr_nid ? 3 : 2;
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if (inode->i_blocks > nr_blocks)
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return false;
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i_size = i_size_read(inode);
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if (i_size > MAX_INLINE_DATA)
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return false;
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return true;
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}
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int f2fs_read_inline_data(struct inode *inode, struct page *page)
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{
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struct page *ipage;
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void *src_addr, *dst_addr;
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if (page->index) {
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zero_user_segment(page, 0, PAGE_CACHE_SIZE);
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goto out;
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}
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ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
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if (IS_ERR(ipage)) {
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unlock_page(page);
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return PTR_ERR(ipage);
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}
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zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
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/* Copy the whole inline data block */
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src_addr = inline_data_addr(ipage);
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dst_addr = kmap(page);
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memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
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kunmap(page);
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f2fs_put_page(ipage, 1);
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out:
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SetPageUptodate(page);
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unlock_page(page);
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return 0;
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}
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static int __f2fs_convert_inline_data(struct inode *inode, struct page *page)
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{
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int err = 0;
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struct page *ipage;
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struct dnode_of_data dn;
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void *src_addr, *dst_addr;
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block_t new_blk_addr;
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struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
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struct f2fs_io_info fio = {
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.type = DATA,
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.rw = WRITE_SYNC | REQ_PRIO,
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};
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f2fs_lock_op(sbi);
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ipage = get_node_page(sbi, inode->i_ino);
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if (IS_ERR(ipage)) {
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err = PTR_ERR(ipage);
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goto out;
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}
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/* someone else converted inline_data already */
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if (!f2fs_has_inline_data(inode))
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goto out;
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/*
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* i_addr[0] is not used for inline data,
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* so reserving new block will not destroy inline data
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*/
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set_new_dnode(&dn, inode, ipage, NULL, 0);
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err = f2fs_reserve_block(&dn, 0);
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if (err)
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goto out;
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f2fs_wait_on_page_writeback(page, DATA);
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zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
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/* Copy the whole inline data block */
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src_addr = inline_data_addr(ipage);
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dst_addr = kmap(page);
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memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
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kunmap(page);
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SetPageUptodate(page);
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/* write data page to try to make data consistent */
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set_page_writeback(page);
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write_data_page(page, &dn, &new_blk_addr, &fio);
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update_extent_cache(new_blk_addr, &dn);
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f2fs_wait_on_page_writeback(page, DATA);
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/* clear inline data and flag after data writeback */
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zero_user_segment(ipage, INLINE_DATA_OFFSET,
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INLINE_DATA_OFFSET + MAX_INLINE_DATA);
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clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
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stat_dec_inline_inode(inode);
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sync_inode_page(&dn);
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f2fs_put_dnode(&dn);
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out:
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f2fs_unlock_op(sbi);
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return err;
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}
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int f2fs_convert_inline_data(struct inode *inode, pgoff_t to_size,
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struct page *page)
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{
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struct page *new_page = page;
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int err;
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if (!f2fs_has_inline_data(inode))
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return 0;
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else if (to_size <= MAX_INLINE_DATA)
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return 0;
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if (!page || page->index != 0) {
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new_page = grab_cache_page(inode->i_mapping, 0);
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if (!new_page)
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return -ENOMEM;
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}
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err = __f2fs_convert_inline_data(inode, new_page);
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if (!page || page->index != 0)
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f2fs_put_page(new_page, 1);
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return err;
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}
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int f2fs_write_inline_data(struct inode *inode,
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struct page *page, unsigned size)
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{
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void *src_addr, *dst_addr;
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struct page *ipage;
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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, 0, LOOKUP_NODE);
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if (err)
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return err;
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ipage = dn.inode_page;
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f2fs_wait_on_page_writeback(ipage, NODE);
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zero_user_segment(ipage, INLINE_DATA_OFFSET,
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INLINE_DATA_OFFSET + MAX_INLINE_DATA);
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src_addr = kmap(page);
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dst_addr = inline_data_addr(ipage);
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memcpy(dst_addr, src_addr, size);
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kunmap(page);
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/* Release the first data block if it is allocated */
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if (!f2fs_has_inline_data(inode)) {
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truncate_data_blocks_range(&dn, 1);
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set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
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stat_inc_inline_inode(inode);
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}
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set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
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sync_inode_page(&dn);
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f2fs_put_dnode(&dn);
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return 0;
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}
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void truncate_inline_data(struct inode *inode, u64 from)
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{
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struct page *ipage;
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if (from >= MAX_INLINE_DATA)
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return;
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ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
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if (IS_ERR(ipage))
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return;
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f2fs_wait_on_page_writeback(ipage, NODE);
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zero_user_segment(ipage, INLINE_DATA_OFFSET + from,
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INLINE_DATA_OFFSET + MAX_INLINE_DATA);
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set_page_dirty(ipage);
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f2fs_put_page(ipage, 1);
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}
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bool recover_inline_data(struct inode *inode, struct page *npage)
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{
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struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
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struct f2fs_inode *ri = NULL;
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void *src_addr, *dst_addr;
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struct page *ipage;
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/*
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* The inline_data recovery policy is as follows.
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* [prev.] [next] of inline_data flag
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* o o -> recover inline_data
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* o x -> remove inline_data, and then recover data blocks
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* x o -> remove inline_data, and then recover inline_data
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* x x -> recover data blocks
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*/
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if (IS_INODE(npage))
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ri = F2FS_INODE(npage);
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if (f2fs_has_inline_data(inode) &&
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ri && (ri->i_inline & F2FS_INLINE_DATA)) {
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process_inline:
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ipage = get_node_page(sbi, inode->i_ino);
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f2fs_bug_on(sbi, IS_ERR(ipage));
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f2fs_wait_on_page_writeback(ipage, NODE);
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src_addr = inline_data_addr(npage);
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dst_addr = inline_data_addr(ipage);
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memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
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update_inode(inode, ipage);
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f2fs_put_page(ipage, 1);
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return true;
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}
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if (f2fs_has_inline_data(inode)) {
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ipage = get_node_page(sbi, inode->i_ino);
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f2fs_bug_on(sbi, IS_ERR(ipage));
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f2fs_wait_on_page_writeback(ipage, NODE);
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zero_user_segment(ipage, INLINE_DATA_OFFSET,
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INLINE_DATA_OFFSET + MAX_INLINE_DATA);
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clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
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update_inode(inode, ipage);
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f2fs_put_page(ipage, 1);
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} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
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truncate_blocks(inode, 0, false);
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set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
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goto process_inline;
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}
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return false;
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}
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