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linux-pinenote/fs/f2fs/inline.c
Jaegeuk Kim 88b88a6679 f2fs: support atomic writes 
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>
2014-10-06 17:39:50 -07:00

259 lines
6.2 KiB
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/*
* fs/f2fs/inline.c
* Copyright (c) 2013, Intel Corporation
* Authors: Huajun Li <huajun.li@intel.com>
* Haicheng Li <haicheng.li@intel.com>
* 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"
bool f2fs_may_inline(struct inode *inode)
{
block_t nr_blocks;
loff_t i_size;
if (!test_opt(F2FS_I_SB(inode), INLINE_DATA))
return false;
if (f2fs_is_atomic_file(inode))
return false;
nr_blocks = F2FS_I(inode)->i_xattr_nid ? 3 : 2;
if (inode->i_blocks > nr_blocks)
return false;
i_size = i_size_read(inode);
if (i_size > MAX_INLINE_DATA)
return false;
return true;
}
int f2fs_read_inline_data(struct inode *inode, struct page *page)
{
struct page *ipage;
void *src_addr, *dst_addr;
if (page->index) {
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
goto out;
}
ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
if (IS_ERR(ipage)) {
unlock_page(page);
return PTR_ERR(ipage);
}
zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
/* Copy the whole inline data block */
src_addr = inline_data_addr(ipage);
dst_addr = kmap(page);
memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
kunmap(page);
f2fs_put_page(ipage, 1);
out:
SetPageUptodate(page);
unlock_page(page);
return 0;
}
static int __f2fs_convert_inline_data(struct inode *inode, struct page *page)
{
int err = 0;
struct page *ipage;
struct dnode_of_data dn;
void *src_addr, *dst_addr;
block_t new_blk_addr;
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct f2fs_io_info fio = {
.type = DATA,
.rw = WRITE_SYNC | REQ_PRIO,
};
f2fs_lock_op(sbi);
ipage = get_node_page(sbi, inode->i_ino);
if (IS_ERR(ipage)) {
err = PTR_ERR(ipage);
goto out;
}
/* someone else converted inline_data already */
if (!f2fs_has_inline_data(inode))
goto out;
/*
* i_addr[0] is not used for inline data,
* so reserving new block will not destroy inline data
*/
set_new_dnode(&dn, inode, ipage, NULL, 0);
err = f2fs_reserve_block(&dn, 0);
if (err)
goto out;
f2fs_wait_on_page_writeback(page, DATA);
zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
/* Copy the whole inline data block */
src_addr = inline_data_addr(ipage);
dst_addr = kmap(page);
memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
kunmap(page);
SetPageUptodate(page);
/* write data page to try to make data consistent */
set_page_writeback(page);
write_data_page(page, &dn, &new_blk_addr, &fio);
update_extent_cache(new_blk_addr, &dn);
f2fs_wait_on_page_writeback(page, DATA);
/* clear inline data and flag after data writeback */
zero_user_segment(ipage, INLINE_DATA_OFFSET,
INLINE_DATA_OFFSET + MAX_INLINE_DATA);
clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
stat_dec_inline_inode(inode);
sync_inode_page(&dn);
f2fs_put_dnode(&dn);
out:
f2fs_unlock_op(sbi);
return err;
}
int f2fs_convert_inline_data(struct inode *inode, pgoff_t to_size,
struct page *page)
{
struct page *new_page = page;
int err;
if (!f2fs_has_inline_data(inode))
return 0;
else if (to_size <= MAX_INLINE_DATA)
return 0;
if (!page || page->index != 0) {
new_page = grab_cache_page(inode->i_mapping, 0);
if (!new_page)
return -ENOMEM;
}
err = __f2fs_convert_inline_data(inode, new_page);
if (!page || page->index != 0)
f2fs_put_page(new_page, 1);
return err;
}
int f2fs_write_inline_data(struct inode *inode,
struct page *page, unsigned size)
{
void *src_addr, *dst_addr;
struct page *ipage;
struct dnode_of_data dn;
int err;
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
if (err)
return err;
ipage = dn.inode_page;
f2fs_wait_on_page_writeback(ipage, NODE);
zero_user_segment(ipage, INLINE_DATA_OFFSET,
INLINE_DATA_OFFSET + MAX_INLINE_DATA);
src_addr = kmap(page);
dst_addr = inline_data_addr(ipage);
memcpy(dst_addr, src_addr, size);
kunmap(page);
/* Release the first data block if it is allocated */
if (!f2fs_has_inline_data(inode)) {
truncate_data_blocks_range(&dn, 1);
set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
stat_inc_inline_inode(inode);
}
set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
sync_inode_page(&dn);
f2fs_put_dnode(&dn);
return 0;
}
void truncate_inline_data(struct inode *inode, u64 from)
{
struct page *ipage;
if (from >= MAX_INLINE_DATA)
return;
ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
if (IS_ERR(ipage))
return;
f2fs_wait_on_page_writeback(ipage, NODE);
zero_user_segment(ipage, INLINE_DATA_OFFSET + from,
INLINE_DATA_OFFSET + MAX_INLINE_DATA);
set_page_dirty(ipage);
f2fs_put_page(ipage, 1);
}
bool recover_inline_data(struct inode *inode, struct page *npage)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct f2fs_inode *ri = NULL;
void *src_addr, *dst_addr;
struct page *ipage;
/*
* The inline_data recovery policy is as follows.
* [prev.] [next] of inline_data flag
* o o -> recover inline_data
* o x -> remove inline_data, and then recover data blocks
* x o -> remove inline_data, and then recover inline_data
* x x -> recover data blocks
*/
if (IS_INODE(npage))
ri = F2FS_INODE(npage);
if (f2fs_has_inline_data(inode) &&
ri && (ri->i_inline & F2FS_INLINE_DATA)) {
process_inline:
ipage = get_node_page(sbi, inode->i_ino);
f2fs_bug_on(sbi, IS_ERR(ipage));
f2fs_wait_on_page_writeback(ipage, NODE);
src_addr = inline_data_addr(npage);
dst_addr = inline_data_addr(ipage);
memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
update_inode(inode, ipage);
f2fs_put_page(ipage, 1);
return true;
}
if (f2fs_has_inline_data(inode)) {
ipage = get_node_page(sbi, inode->i_ino);
f2fs_bug_on(sbi, IS_ERR(ipage));
f2fs_wait_on_page_writeback(ipage, NODE);
zero_user_segment(ipage, INLINE_DATA_OFFSET,
INLINE_DATA_OFFSET + MAX_INLINE_DATA);
clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
update_inode(inode, ipage);
f2fs_put_page(ipage, 1);
} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
truncate_blocks(inode, 0, false);
set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
goto process_inline;
}
return false;
}
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