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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-18 02:04:05 +08:00
linux-next/fs/f2fs/checkpoint.c
Jaegeuk Kim 3cb5ad152b f2fs: call f2fs_wait_on_page_writeback instead of native function
If a page is on writeback, f2fs can face with deadlock due to under writepages.
This is caused by merging IOs inside f2fs, so if it comes to detect, let's throw
merged IOs, which is implemented by f2fs_wait_on_page_writeback.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2014-03-20 22:10:04 +09:00

959 lines
24 KiB
C

/*
* fs/f2fs/checkpoint.c
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.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/bio.h>
#include <linux/mpage.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/f2fs_fs.h>
#include <linux/pagevec.h>
#include <linux/swap.h>
#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include <trace/events/f2fs.h>
static struct kmem_cache *orphan_entry_slab;
static struct kmem_cache *inode_entry_slab;
/*
* We guarantee no failure on the returned page.
*/
struct page *grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
{
struct address_space *mapping = META_MAPPING(sbi);
struct page *page = NULL;
repeat:
page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS);
if (!page) {
cond_resched();
goto repeat;
}
SetPageUptodate(page);
return page;
}
/*
* We guarantee no failure on the returned page.
*/
struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index)
{
struct address_space *mapping = META_MAPPING(sbi);
struct page *page;
repeat:
page = grab_cache_page(mapping, index);
if (!page) {
cond_resched();
goto repeat;
}
if (PageUptodate(page))
goto out;
if (f2fs_submit_page_bio(sbi, page, index,
READ_SYNC | REQ_META | REQ_PRIO))
goto repeat;
lock_page(page);
if (unlikely(page->mapping != mapping)) {
f2fs_put_page(page, 1);
goto repeat;
}
out:
mark_page_accessed(page);
return page;
}
inline int get_max_meta_blks(struct f2fs_sb_info *sbi, int type)
{
switch (type) {
case META_NAT:
return NM_I(sbi)->max_nid / NAT_ENTRY_PER_BLOCK;
case META_SIT:
return SIT_BLK_CNT(sbi);
case META_SSA:
case META_CP:
return 0;
default:
BUG();
}
}
/*
* Readahead CP/NAT/SIT/SSA pages
*/
int ra_meta_pages(struct f2fs_sb_info *sbi, int start, int nrpages, int type)
{
block_t prev_blk_addr = 0;
struct page *page;
int blkno = start;
int max_blks = get_max_meta_blks(sbi, type);
struct f2fs_io_info fio = {
.type = META,
.rw = READ_SYNC | REQ_META | REQ_PRIO
};
for (; nrpages-- > 0; blkno++) {
block_t blk_addr;
switch (type) {
case META_NAT:
/* get nat block addr */
if (unlikely(blkno >= max_blks))
blkno = 0;
blk_addr = current_nat_addr(sbi,
blkno * NAT_ENTRY_PER_BLOCK);
break;
case META_SIT:
/* get sit block addr */
if (unlikely(blkno >= max_blks))
goto out;
blk_addr = current_sit_addr(sbi,
blkno * SIT_ENTRY_PER_BLOCK);
if (blkno != start && prev_blk_addr + 1 != blk_addr)
goto out;
prev_blk_addr = blk_addr;
break;
case META_SSA:
case META_CP:
/* get ssa/cp block addr */
blk_addr = blkno;
break;
default:
BUG();
}
page = grab_cache_page(META_MAPPING(sbi), blk_addr);
if (!page)
continue;
if (PageUptodate(page)) {
mark_page_accessed(page);
f2fs_put_page(page, 1);
continue;
}
f2fs_submit_page_mbio(sbi, page, blk_addr, &fio);
mark_page_accessed(page);
f2fs_put_page(page, 0);
}
out:
f2fs_submit_merged_bio(sbi, META, READ);
return blkno - start;
}
static int f2fs_write_meta_page(struct page *page,
struct writeback_control *wbc)
{
struct inode *inode = page->mapping->host;
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
if (unlikely(sbi->por_doing))
goto redirty_out;
if (wbc->for_reclaim)
goto redirty_out;
/* Should not write any meta pages, if any IO error was occurred */
if (unlikely(is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ERROR_FLAG)))
goto no_write;
f2fs_wait_on_page_writeback(page, META);
write_meta_page(sbi, page);
no_write:
dec_page_count(sbi, F2FS_DIRTY_META);
unlock_page(page);
return 0;
redirty_out:
dec_page_count(sbi, F2FS_DIRTY_META);
wbc->pages_skipped++;
account_page_redirty(page);
set_page_dirty(page);
return AOP_WRITEPAGE_ACTIVATE;
}
static int f2fs_write_meta_pages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
long diff, written;
/* collect a number of dirty meta pages and write together */
if (wbc->for_kupdate ||
get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
goto skip_write;
/* if mounting is failed, skip writing node pages */
mutex_lock(&sbi->cp_mutex);
diff = nr_pages_to_write(sbi, META, wbc);
written = sync_meta_pages(sbi, META, wbc->nr_to_write);
mutex_unlock(&sbi->cp_mutex);
wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
return 0;
skip_write:
wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META);
return 0;
}
long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type,
long nr_to_write)
{
struct address_space *mapping = META_MAPPING(sbi);
pgoff_t index = 0, end = LONG_MAX;
struct pagevec pvec;
long nwritten = 0;
struct writeback_control wbc = {
.for_reclaim = 0,
};
pagevec_init(&pvec, 0);
while (index <= end) {
int i, nr_pages;
nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
PAGECACHE_TAG_DIRTY,
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
if (unlikely(nr_pages == 0))
break;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
lock_page(page);
if (unlikely(page->mapping != mapping)) {
continue_unlock:
unlock_page(page);
continue;
}
if (!PageDirty(page)) {
/* someone wrote it for us */
goto continue_unlock;
}
if (!clear_page_dirty_for_io(page))
goto continue_unlock;
if (f2fs_write_meta_page(page, &wbc)) {
unlock_page(page);
break;
}
nwritten++;
if (unlikely(nwritten >= nr_to_write))
break;
}
pagevec_release(&pvec);
cond_resched();
}
if (nwritten)
f2fs_submit_merged_bio(sbi, type, WRITE);
return nwritten;
}
static int f2fs_set_meta_page_dirty(struct page *page)
{
struct address_space *mapping = page->mapping;
struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
trace_f2fs_set_page_dirty(page, META);
SetPageUptodate(page);
if (!PageDirty(page)) {
__set_page_dirty_nobuffers(page);
inc_page_count(sbi, F2FS_DIRTY_META);
return 1;
}
return 0;
}
const struct address_space_operations f2fs_meta_aops = {
.writepage = f2fs_write_meta_page,
.writepages = f2fs_write_meta_pages,
.set_page_dirty = f2fs_set_meta_page_dirty,
};
int acquire_orphan_inode(struct f2fs_sb_info *sbi)
{
int err = 0;
spin_lock(&sbi->orphan_inode_lock);
if (unlikely(sbi->n_orphans >= sbi->max_orphans))
err = -ENOSPC;
else
sbi->n_orphans++;
spin_unlock(&sbi->orphan_inode_lock);
return err;
}
void release_orphan_inode(struct f2fs_sb_info *sbi)
{
spin_lock(&sbi->orphan_inode_lock);
f2fs_bug_on(sbi->n_orphans == 0);
sbi->n_orphans--;
spin_unlock(&sbi->orphan_inode_lock);
}
void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
{
struct list_head *head, *this;
struct orphan_inode_entry *new = NULL, *orphan = NULL;
new = f2fs_kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC);
new->ino = ino;
spin_lock(&sbi->orphan_inode_lock);
head = &sbi->orphan_inode_list;
list_for_each(this, head) {
orphan = list_entry(this, struct orphan_inode_entry, list);
if (orphan->ino == ino) {
spin_unlock(&sbi->orphan_inode_lock);
kmem_cache_free(orphan_entry_slab, new);
return;
}
if (orphan->ino > ino)
break;
orphan = NULL;
}
/* add new_oentry into list which is sorted by inode number */
if (orphan)
list_add(&new->list, this->prev);
else
list_add_tail(&new->list, head);
spin_unlock(&sbi->orphan_inode_lock);
}
void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
{
struct list_head *head;
struct orphan_inode_entry *orphan;
spin_lock(&sbi->orphan_inode_lock);
head = &sbi->orphan_inode_list;
list_for_each_entry(orphan, head, list) {
if (orphan->ino == ino) {
list_del(&orphan->list);
kmem_cache_free(orphan_entry_slab, orphan);
f2fs_bug_on(sbi->n_orphans == 0);
sbi->n_orphans--;
break;
}
}
spin_unlock(&sbi->orphan_inode_lock);
}
static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
{
struct inode *inode = f2fs_iget(sbi->sb, ino);
f2fs_bug_on(IS_ERR(inode));
clear_nlink(inode);
/* truncate all the data during iput */
iput(inode);
}
void recover_orphan_inodes(struct f2fs_sb_info *sbi)
{
block_t start_blk, orphan_blkaddr, i, j;
if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG))
return;
sbi->por_doing = true;
start_blk = __start_cp_addr(sbi) + 1;
orphan_blkaddr = __start_sum_addr(sbi) - 1;
ra_meta_pages(sbi, start_blk, orphan_blkaddr, META_CP);
for (i = 0; i < orphan_blkaddr; i++) {
struct page *page = get_meta_page(sbi, start_blk + i);
struct f2fs_orphan_block *orphan_blk;
orphan_blk = (struct f2fs_orphan_block *)page_address(page);
for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) {
nid_t ino = le32_to_cpu(orphan_blk->ino[j]);
recover_orphan_inode(sbi, ino);
}
f2fs_put_page(page, 1);
}
/* clear Orphan Flag */
clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG);
sbi->por_doing = false;
return;
}
static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk)
{
struct list_head *head;
struct f2fs_orphan_block *orphan_blk = NULL;
unsigned int nentries = 0;
unsigned short index;
unsigned short orphan_blocks = (unsigned short)((sbi->n_orphans +
(F2FS_ORPHANS_PER_BLOCK - 1)) / F2FS_ORPHANS_PER_BLOCK);
struct page *page = NULL;
struct orphan_inode_entry *orphan = NULL;
for (index = 0; index < orphan_blocks; index++)
grab_meta_page(sbi, start_blk + index);
index = 1;
spin_lock(&sbi->orphan_inode_lock);
head = &sbi->orphan_inode_list;
/* loop for each orphan inode entry and write them in Jornal block */
list_for_each_entry(orphan, head, list) {
if (!page) {
page = find_get_page(META_MAPPING(sbi), start_blk++);
f2fs_bug_on(!page);
orphan_blk =
(struct f2fs_orphan_block *)page_address(page);
memset(orphan_blk, 0, sizeof(*orphan_blk));
f2fs_put_page(page, 0);
}
orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino);
if (nentries == F2FS_ORPHANS_PER_BLOCK) {
/*
* an orphan block is full of 1020 entries,
* then we need to flush current orphan blocks
* and bring another one in memory
*/
orphan_blk->blk_addr = cpu_to_le16(index);
orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
orphan_blk->entry_count = cpu_to_le32(nentries);
set_page_dirty(page);
f2fs_put_page(page, 1);
index++;
nentries = 0;
page = NULL;
}
}
if (page) {
orphan_blk->blk_addr = cpu_to_le16(index);
orphan_blk->blk_count = cpu_to_le16(orphan_blocks);
orphan_blk->entry_count = cpu_to_le32(nentries);
set_page_dirty(page);
f2fs_put_page(page, 1);
}
spin_unlock(&sbi->orphan_inode_lock);
}
static struct page *validate_checkpoint(struct f2fs_sb_info *sbi,
block_t cp_addr, unsigned long long *version)
{
struct page *cp_page_1, *cp_page_2 = NULL;
unsigned long blk_size = sbi->blocksize;
struct f2fs_checkpoint *cp_block;
unsigned long long cur_version = 0, pre_version = 0;
size_t crc_offset;
__u32 crc = 0;
/* Read the 1st cp block in this CP pack */
cp_page_1 = get_meta_page(sbi, cp_addr);
/* get the version number */
cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1);
crc_offset = le32_to_cpu(cp_block->checksum_offset);
if (crc_offset >= blk_size)
goto invalid_cp1;
crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset)));
if (!f2fs_crc_valid(crc, cp_block, crc_offset))
goto invalid_cp1;
pre_version = cur_cp_version(cp_block);
/* Read the 2nd cp block in this CP pack */
cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
cp_page_2 = get_meta_page(sbi, cp_addr);
cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2);
crc_offset = le32_to_cpu(cp_block->checksum_offset);
if (crc_offset >= blk_size)
goto invalid_cp2;
crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset)));
if (!f2fs_crc_valid(crc, cp_block, crc_offset))
goto invalid_cp2;
cur_version = cur_cp_version(cp_block);
if (cur_version == pre_version) {
*version = cur_version;
f2fs_put_page(cp_page_2, 1);
return cp_page_1;
}
invalid_cp2:
f2fs_put_page(cp_page_2, 1);
invalid_cp1:
f2fs_put_page(cp_page_1, 1);
return NULL;
}
int get_valid_checkpoint(struct f2fs_sb_info *sbi)
{
struct f2fs_checkpoint *cp_block;
struct f2fs_super_block *fsb = sbi->raw_super;
struct page *cp1, *cp2, *cur_page;
unsigned long blk_size = sbi->blocksize;
unsigned long long cp1_version = 0, cp2_version = 0;
unsigned long long cp_start_blk_no;
sbi->ckpt = kzalloc(blk_size, GFP_KERNEL);
if (!sbi->ckpt)
return -ENOMEM;
/*
* Finding out valid cp block involves read both
* sets( cp pack1 and cp pack 2)
*/
cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr);
cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version);
/* The second checkpoint pack should start at the next segment */
cp_start_blk_no += ((unsigned long long)1) <<
le32_to_cpu(fsb->log_blocks_per_seg);
cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version);
if (cp1 && cp2) {
if (ver_after(cp2_version, cp1_version))
cur_page = cp2;
else
cur_page = cp1;
} else if (cp1) {
cur_page = cp1;
} else if (cp2) {
cur_page = cp2;
} else {
goto fail_no_cp;
}
cp_block = (struct f2fs_checkpoint *)page_address(cur_page);
memcpy(sbi->ckpt, cp_block, blk_size);
f2fs_put_page(cp1, 1);
f2fs_put_page(cp2, 1);
return 0;
fail_no_cp:
kfree(sbi->ckpt);
return -EINVAL;
}
static int __add_dirty_inode(struct inode *inode, struct dir_inode_entry *new)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct list_head *head = &sbi->dir_inode_list;
struct list_head *this;
list_for_each(this, head) {
struct dir_inode_entry *entry;
entry = list_entry(this, struct dir_inode_entry, list);
if (unlikely(entry->inode == inode))
return -EEXIST;
}
list_add_tail(&new->list, head);
stat_inc_dirty_dir(sbi);
return 0;
}
void set_dirty_dir_page(struct inode *inode, struct page *page)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct dir_inode_entry *new;
if (!S_ISDIR(inode->i_mode))
return;
new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
new->inode = inode;
INIT_LIST_HEAD(&new->list);
spin_lock(&sbi->dir_inode_lock);
if (__add_dirty_inode(inode, new))
kmem_cache_free(inode_entry_slab, new);
inode_inc_dirty_dents(inode);
SetPagePrivate(page);
spin_unlock(&sbi->dir_inode_lock);
}
void add_dirty_dir_inode(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct dir_inode_entry *new =
f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
new->inode = inode;
INIT_LIST_HEAD(&new->list);
spin_lock(&sbi->dir_inode_lock);
if (__add_dirty_inode(inode, new))
kmem_cache_free(inode_entry_slab, new);
spin_unlock(&sbi->dir_inode_lock);
}
void remove_dirty_dir_inode(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct list_head *this, *head;
if (!S_ISDIR(inode->i_mode))
return;
spin_lock(&sbi->dir_inode_lock);
if (get_dirty_dents(inode)) {
spin_unlock(&sbi->dir_inode_lock);
return;
}
head = &sbi->dir_inode_list;
list_for_each(this, head) {
struct dir_inode_entry *entry;
entry = list_entry(this, struct dir_inode_entry, list);
if (entry->inode == inode) {
list_del(&entry->list);
kmem_cache_free(inode_entry_slab, entry);
stat_dec_dirty_dir(sbi);
break;
}
}
spin_unlock(&sbi->dir_inode_lock);
/* Only from the recovery routine */
if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) {
clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT);
iput(inode);
}
}
struct inode *check_dirty_dir_inode(struct f2fs_sb_info *sbi, nid_t ino)
{
struct list_head *this, *head;
struct inode *inode = NULL;
spin_lock(&sbi->dir_inode_lock);
head = &sbi->dir_inode_list;
list_for_each(this, head) {
struct dir_inode_entry *entry;
entry = list_entry(this, struct dir_inode_entry, list);
if (entry->inode->i_ino == ino) {
inode = entry->inode;
break;
}
}
spin_unlock(&sbi->dir_inode_lock);
return inode;
}
void sync_dirty_dir_inodes(struct f2fs_sb_info *sbi)
{
struct list_head *head;
struct dir_inode_entry *entry;
struct inode *inode;
retry:
spin_lock(&sbi->dir_inode_lock);
head = &sbi->dir_inode_list;
if (list_empty(head)) {
spin_unlock(&sbi->dir_inode_lock);
return;
}
entry = list_entry(head->next, struct dir_inode_entry, list);
inode = igrab(entry->inode);
spin_unlock(&sbi->dir_inode_lock);
if (inode) {
filemap_fdatawrite(inode->i_mapping);
iput(inode);
} else {
/*
* We should submit bio, since it exists several
* wribacking dentry pages in the freeing inode.
*/
f2fs_submit_merged_bio(sbi, DATA, WRITE);
}
goto retry;
}
/*
* Freeze all the FS-operations for checkpoint.
*/
static void block_operations(struct f2fs_sb_info *sbi)
{
struct writeback_control wbc = {
.sync_mode = WB_SYNC_ALL,
.nr_to_write = LONG_MAX,
.for_reclaim = 0,
};
struct blk_plug plug;
blk_start_plug(&plug);
retry_flush_dents:
f2fs_lock_all(sbi);
/* write all the dirty dentry pages */
if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
f2fs_unlock_all(sbi);
sync_dirty_dir_inodes(sbi);
goto retry_flush_dents;
}
/*
* POR: we should ensure that there is no dirty node pages
* until finishing nat/sit flush.
*/
retry_flush_nodes:
mutex_lock(&sbi->node_write);
if (get_pages(sbi, F2FS_DIRTY_NODES)) {
mutex_unlock(&sbi->node_write);
sync_node_pages(sbi, 0, &wbc);
goto retry_flush_nodes;
}
blk_finish_plug(&plug);
}
static void unblock_operations(struct f2fs_sb_info *sbi)
{
mutex_unlock(&sbi->node_write);
f2fs_unlock_all(sbi);
}
static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
{
DEFINE_WAIT(wait);
for (;;) {
prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE);
if (!get_pages(sbi, F2FS_WRITEBACK))
break;
io_schedule();
}
finish_wait(&sbi->cp_wait, &wait);
}
static void do_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
{
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
nid_t last_nid = 0;
block_t start_blk;
struct page *cp_page;
unsigned int data_sum_blocks, orphan_blocks;
__u32 crc32 = 0;
void *kaddr;
int i;
/* Flush all the NAT/SIT pages */
while (get_pages(sbi, F2FS_DIRTY_META))
sync_meta_pages(sbi, META, LONG_MAX);
next_free_nid(sbi, &last_nid);
/*
* modify checkpoint
* version number is already updated
*/
ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi));
ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi));
ckpt->free_segment_count = cpu_to_le32(free_segments(sbi));
for (i = 0; i < 3; i++) {
ckpt->cur_node_segno[i] =
cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE));
ckpt->cur_node_blkoff[i] =
cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE));
ckpt->alloc_type[i + CURSEG_HOT_NODE] =
curseg_alloc_type(sbi, i + CURSEG_HOT_NODE);
}
for (i = 0; i < 3; i++) {
ckpt->cur_data_segno[i] =
cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA));
ckpt->cur_data_blkoff[i] =
cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA));
ckpt->alloc_type[i + CURSEG_HOT_DATA] =
curseg_alloc_type(sbi, i + CURSEG_HOT_DATA);
}
ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi));
ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi));
ckpt->next_free_nid = cpu_to_le32(last_nid);
/* 2 cp + n data seg summary + orphan inode blocks */
data_sum_blocks = npages_for_summary_flush(sbi);
if (data_sum_blocks < 3)
set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
else
clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
orphan_blocks = (sbi->n_orphans + F2FS_ORPHANS_PER_BLOCK - 1)
/ F2FS_ORPHANS_PER_BLOCK;
ckpt->cp_pack_start_sum = cpu_to_le32(1 + orphan_blocks);
if (is_umount) {
set_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
ckpt->cp_pack_total_block_count = cpu_to_le32(2 +
data_sum_blocks + orphan_blocks + NR_CURSEG_NODE_TYPE);
} else {
clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG);
ckpt->cp_pack_total_block_count = cpu_to_le32(2 +
data_sum_blocks + orphan_blocks);
}
if (sbi->n_orphans)
set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
else
clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG);
/* update SIT/NAT bitmap */
get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP));
get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP));
crc32 = f2fs_crc32(ckpt, le32_to_cpu(ckpt->checksum_offset));
*((__le32 *)((unsigned char *)ckpt +
le32_to_cpu(ckpt->checksum_offset)))
= cpu_to_le32(crc32);
start_blk = __start_cp_addr(sbi);
/* write out checkpoint buffer at block 0 */
cp_page = grab_meta_page(sbi, start_blk++);
kaddr = page_address(cp_page);
memcpy(kaddr, ckpt, (1 << sbi->log_blocksize));
set_page_dirty(cp_page);
f2fs_put_page(cp_page, 1);
if (sbi->n_orphans) {
write_orphan_inodes(sbi, start_blk);
start_blk += orphan_blocks;
}
write_data_summaries(sbi, start_blk);
start_blk += data_sum_blocks;
if (is_umount) {
write_node_summaries(sbi, start_blk);
start_blk += NR_CURSEG_NODE_TYPE;
}
/* writeout checkpoint block */
cp_page = grab_meta_page(sbi, start_blk);
kaddr = page_address(cp_page);
memcpy(kaddr, ckpt, (1 << sbi->log_blocksize));
set_page_dirty(cp_page);
f2fs_put_page(cp_page, 1);
/* wait for previous submitted node/meta pages writeback */
wait_on_all_pages_writeback(sbi);
filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LONG_MAX);
filemap_fdatawait_range(META_MAPPING(sbi), 0, LONG_MAX);
/* update user_block_counts */
sbi->last_valid_block_count = sbi->total_valid_block_count;
sbi->alloc_valid_block_count = 0;
/* Here, we only have one bio having CP pack */
sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
if (unlikely(!is_set_ckpt_flags(ckpt, CP_ERROR_FLAG))) {
clear_prefree_segments(sbi);
F2FS_RESET_SB_DIRT(sbi);
}
}
/*
* We guarantee that this checkpoint procedure should not fail.
*/
void write_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
{
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
unsigned long long ckpt_ver;
trace_f2fs_write_checkpoint(sbi->sb, is_umount, "start block_ops");
mutex_lock(&sbi->cp_mutex);
block_operations(sbi);
trace_f2fs_write_checkpoint(sbi->sb, is_umount, "finish block_ops");
f2fs_submit_merged_bio(sbi, DATA, WRITE);
f2fs_submit_merged_bio(sbi, NODE, WRITE);
f2fs_submit_merged_bio(sbi, META, WRITE);
/*
* update checkpoint pack index
* Increase the version number so that
* SIT entries and seg summaries are written at correct place
*/
ckpt_ver = cur_cp_version(ckpt);
ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver);
/* write cached NAT/SIT entries to NAT/SIT area */
flush_nat_entries(sbi);
flush_sit_entries(sbi);
/* unlock all the fs_lock[] in do_checkpoint() */
do_checkpoint(sbi, is_umount);
unblock_operations(sbi);
mutex_unlock(&sbi->cp_mutex);
stat_inc_cp_count(sbi->stat_info);
trace_f2fs_write_checkpoint(sbi->sb, is_umount, "finish checkpoint");
}
void init_orphan_info(struct f2fs_sb_info *sbi)
{
spin_lock_init(&sbi->orphan_inode_lock);
INIT_LIST_HEAD(&sbi->orphan_inode_list);
sbi->n_orphans = 0;
/*
* considering 512 blocks in a segment 8 blocks are needed for cp
* and log segment summaries. Remaining blocks are used to keep
* orphan entries with the limitation one reserved segment
* for cp pack we can have max 1020*504 orphan entries
*/
sbi->max_orphans = (sbi->blocks_per_seg - 2 - NR_CURSEG_TYPE)
* F2FS_ORPHANS_PER_BLOCK;
}
int __init create_checkpoint_caches(void)
{
orphan_entry_slab = f2fs_kmem_cache_create("f2fs_orphan_entry",
sizeof(struct orphan_inode_entry));
if (!orphan_entry_slab)
return -ENOMEM;
inode_entry_slab = f2fs_kmem_cache_create("f2fs_dirty_dir_entry",
sizeof(struct dir_inode_entry));
if (!inode_entry_slab) {
kmem_cache_destroy(orphan_entry_slab);
return -ENOMEM;
}
return 0;
}
void destroy_checkpoint_caches(void)
{
kmem_cache_destroy(orphan_entry_slab);
kmem_cache_destroy(inode_entry_slab);
}