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kernel-fxtec-pro1x/fs/f2fs/segment.c
Jaegeuk Kim 763bfe1bc5 f2fs: remove reusing any prefree segments 
This patch removes check_prefree_segments initially designed to enhance the
performance by narrowing the range of LBA usage across the whole block device.

When allocating a new segment, previous f2fs tries to find proper prefree
segments, and then, if finds a segment, it reuses the segment for further
data or node block allocation.

However, I found that this was totally wrong approach since the prefree segments
have several data or node blocks that will be used by the roll-forward mechanism
operated after sudden-power-off.

Let's assume the following scenario.

/* write 8MB with fsync */
for (i = 0; i < 2048; i++) {
	offset = i * 4096;
	write(fd, offset, 4KB);
	fsync(fd);
}

In this case, naive segment allocation sequence will be like:
 data segment: x, x+1, x+2, x+3
 node segment: y, y+1, y+2, y+3.

But, if we can reuse prefree segments, the sequence can be like:
 data segment: x, x+1, y, y+1
 node segment: y, y+1, y+2, y+3.
Because, y, y+1, and y+2 became prefree segments one by one, and those are
reused by data allocation.

After conducting this workload, we should consider how to recover the latest
inode with its data.
If we reuse the prefree segments such as y or y+1, we lost the old node blocks
so that f2fs even cannot start roll-forward recovery.

Therefore, I suggest that we should remove reusing prefree segments.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-02 08:48:15 +09:00

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/*
* fs/f2fs/segment.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/f2fs_fs.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/prefetch.h>
#include <linux/vmalloc.h>
#include "f2fs.h"
#include "segment.h"
#include "node.h"
#include <trace/events/f2fs.h>
/*
* This function balances dirty node and dentry pages.
* In addition, it controls garbage collection.
*/
void f2fs_balance_fs(struct f2fs_sb_info *sbi)
{
/*
* We should do GC or end up with checkpoint, if there are so many dirty
* dir/node pages without enough free segments.
*/
if (has_not_enough_free_secs(sbi, 0)) {
mutex_lock(&sbi->gc_mutex);
f2fs_gc(sbi);
}
}
static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
enum dirty_type dirty_type)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
/* need not be added */
if (IS_CURSEG(sbi, segno))
return;
if (!test_and_set_bit(segno, dirty_i->dirty_segmap[dirty_type]))
dirty_i->nr_dirty[dirty_type]++;
if (dirty_type == DIRTY) {
struct seg_entry *sentry = get_seg_entry(sbi, segno);
enum dirty_type t = DIRTY_HOT_DATA;
dirty_type = sentry->type;
if (!test_and_set_bit(segno, dirty_i->dirty_segmap[dirty_type]))
dirty_i->nr_dirty[dirty_type]++;
/* Only one bitmap should be set */
for (; t <= DIRTY_COLD_NODE; t++) {
if (t == dirty_type)
continue;
if (test_and_clear_bit(segno, dirty_i->dirty_segmap[t]))
dirty_i->nr_dirty[t]--;
}
}
}
static void __remove_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
enum dirty_type dirty_type)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
if (test_and_clear_bit(segno, dirty_i->dirty_segmap[dirty_type]))
dirty_i->nr_dirty[dirty_type]--;
if (dirty_type == DIRTY) {
enum dirty_type t = DIRTY_HOT_DATA;
/* clear all the bitmaps */
for (; t <= DIRTY_COLD_NODE; t++)
if (test_and_clear_bit(segno, dirty_i->dirty_segmap[t]))
dirty_i->nr_dirty[t]--;
if (get_valid_blocks(sbi, segno, sbi->segs_per_sec) == 0)
clear_bit(GET_SECNO(sbi, segno),
dirty_i->victim_secmap);
}
}
/*
* Should not occur error such as -ENOMEM.
* Adding dirty entry into seglist is not critical operation.
* If a given segment is one of current working segments, it won't be added.
*/
static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
unsigned short valid_blocks;
if (segno == NULL_SEGNO || IS_CURSEG(sbi, segno))
return;
mutex_lock(&dirty_i->seglist_lock);
valid_blocks = get_valid_blocks(sbi, segno, 0);
if (valid_blocks == 0) {
__locate_dirty_segment(sbi, segno, PRE);
__remove_dirty_segment(sbi, segno, DIRTY);
} else if (valid_blocks < sbi->blocks_per_seg) {
__locate_dirty_segment(sbi, segno, DIRTY);
} else {
/* Recovery routine with SSR needs this */
__remove_dirty_segment(sbi, segno, DIRTY);
}
mutex_unlock(&dirty_i->seglist_lock);
return;
}
/*
* Should call clear_prefree_segments after checkpoint is done.
*/
static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
unsigned int segno = -1;
unsigned int total_segs = TOTAL_SEGS(sbi);
mutex_lock(&dirty_i->seglist_lock);
while (1) {
segno = find_next_bit(dirty_i->dirty_segmap[PRE], total_segs,
segno + 1);
if (segno >= total_segs)
break;
__set_test_and_free(sbi, segno);
}
mutex_unlock(&dirty_i->seglist_lock);
}
void clear_prefree_segments(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
unsigned int segno = -1;
unsigned int total_segs = TOTAL_SEGS(sbi);
mutex_lock(&dirty_i->seglist_lock);
while (1) {
segno = find_next_bit(dirty_i->dirty_segmap[PRE], total_segs,
segno + 1);
if (segno >= total_segs)
break;
if (test_and_clear_bit(segno, dirty_i->dirty_segmap[PRE]))
dirty_i->nr_dirty[PRE]--;
/* Let's use trim */
if (test_opt(sbi, DISCARD))
blkdev_issue_discard(sbi->sb->s_bdev,
START_BLOCK(sbi, segno) <<
sbi->log_sectors_per_block,
1 << (sbi->log_sectors_per_block +
sbi->log_blocks_per_seg),
GFP_NOFS, 0);
}
mutex_unlock(&dirty_i->seglist_lock);
}
static void __mark_sit_entry_dirty(struct f2fs_sb_info *sbi, unsigned int segno)
{
struct sit_info *sit_i = SIT_I(sbi);
if (!__test_and_set_bit(segno, sit_i->dirty_sentries_bitmap))
sit_i->dirty_sentries++;
}
static void __set_sit_entry_type(struct f2fs_sb_info *sbi, int type,
unsigned int segno, int modified)
{
struct seg_entry *se = get_seg_entry(sbi, segno);
se->type = type;
if (modified)
__mark_sit_entry_dirty(sbi, segno);
}
static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
{
struct seg_entry *se;
unsigned int segno, offset;
long int new_vblocks;
segno = GET_SEGNO(sbi, blkaddr);
se = get_seg_entry(sbi, segno);
new_vblocks = se->valid_blocks + del;
offset = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) & (sbi->blocks_per_seg - 1);
BUG_ON((new_vblocks >> (sizeof(unsigned short) << 3) ||
(new_vblocks > sbi->blocks_per_seg)));
se->valid_blocks = new_vblocks;
se->mtime = get_mtime(sbi);
SIT_I(sbi)->max_mtime = se->mtime;
/* Update valid block bitmap */
if (del > 0) {
if (f2fs_set_bit(offset, se->cur_valid_map))
BUG();
} else {
if (!f2fs_clear_bit(offset, se->cur_valid_map))
BUG();
}
if (!f2fs_test_bit(offset, se->ckpt_valid_map))
se->ckpt_valid_blocks += del;
__mark_sit_entry_dirty(sbi, segno);
/* update total number of valid blocks to be written in ckpt area */
SIT_I(sbi)->written_valid_blocks += del;
if (sbi->segs_per_sec > 1)
get_sec_entry(sbi, segno)->valid_blocks += del;
}
static void refresh_sit_entry(struct f2fs_sb_info *sbi,
block_t old_blkaddr, block_t new_blkaddr)
{
update_sit_entry(sbi, new_blkaddr, 1);
if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
update_sit_entry(sbi, old_blkaddr, -1);
}
void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
{
unsigned int segno = GET_SEGNO(sbi, addr);
struct sit_info *sit_i = SIT_I(sbi);
BUG_ON(addr == NULL_ADDR);
if (addr == NEW_ADDR)
return;
/* add it into sit main buffer */
mutex_lock(&sit_i->sentry_lock);
update_sit_entry(sbi, addr, -1);
/* add it into dirty seglist */
locate_dirty_segment(sbi, segno);
mutex_unlock(&sit_i->sentry_lock);
}
/*
* This function should be resided under the curseg_mutex lock
*/
static void __add_sum_entry(struct f2fs_sb_info *sbi, int type,
struct f2fs_summary *sum)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
void *addr = curseg->sum_blk;
addr += curseg->next_blkoff * sizeof(struct f2fs_summary);
memcpy(addr, sum, sizeof(struct f2fs_summary));
return;
}
/*
* Calculate the number of current summary pages for writing
*/
int npages_for_summary_flush(struct f2fs_sb_info *sbi)
{
int total_size_bytes = 0;
int valid_sum_count = 0;
int i, sum_space;
for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
if (sbi->ckpt->alloc_type[i] == SSR)
valid_sum_count += sbi->blocks_per_seg;
else
valid_sum_count += curseg_blkoff(sbi, i);
}
total_size_bytes = valid_sum_count * (SUMMARY_SIZE + 1)
+ sizeof(struct nat_journal) + 2
+ sizeof(struct sit_journal) + 2;
sum_space = PAGE_CACHE_SIZE - SUM_FOOTER_SIZE;
if (total_size_bytes < sum_space)
return 1;
else if (total_size_bytes < 2 * sum_space)
return 2;
return 3;
}
/*
* Caller should put this summary page
*/
struct page *get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno)
{
return get_meta_page(sbi, GET_SUM_BLOCK(sbi, segno));
}
static void write_sum_page(struct f2fs_sb_info *sbi,
struct f2fs_summary_block *sum_blk, block_t blk_addr)
{
struct page *page = grab_meta_page(sbi, blk_addr);
void *kaddr = page_address(page);
memcpy(kaddr, sum_blk, PAGE_CACHE_SIZE);
set_page_dirty(page);
f2fs_put_page(page, 1);
}
static int is_next_segment_free(struct f2fs_sb_info *sbi, int type)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
unsigned int segno = curseg->segno + 1;
struct free_segmap_info *free_i = FREE_I(sbi);
if (segno < TOTAL_SEGS(sbi) && segno % sbi->segs_per_sec)
return !test_bit(segno, free_i->free_segmap);
return 0;
}
/*
* Find a new segment from the free segments bitmap to right order
* This function should be returned with success, otherwise BUG
*/
static void get_new_segment(struct f2fs_sb_info *sbi,
unsigned int *newseg, bool new_sec, int dir)
{
struct free_segmap_info *free_i = FREE_I(sbi);
unsigned int segno, secno, zoneno;
unsigned int total_zones = TOTAL_SECS(sbi) / sbi->secs_per_zone;
unsigned int hint = *newseg / sbi->segs_per_sec;
unsigned int old_zoneno = GET_ZONENO_FROM_SEGNO(sbi, *newseg);
unsigned int left_start = hint;
bool init = true;
int go_left = 0;
int i;
write_lock(&free_i->segmap_lock);
if (!new_sec && ((*newseg + 1) % sbi->segs_per_sec)) {
segno = find_next_zero_bit(free_i->free_segmap,
TOTAL_SEGS(sbi), *newseg + 1);
if (segno - *newseg < sbi->segs_per_sec -
(*newseg % sbi->segs_per_sec))
goto got_it;
}
find_other_zone:
secno = find_next_zero_bit(free_i->free_secmap, TOTAL_SECS(sbi), hint);
if (secno >= TOTAL_SECS(sbi)) {
if (dir == ALLOC_RIGHT) {
secno = find_next_zero_bit(free_i->free_secmap,
TOTAL_SECS(sbi), 0);
BUG_ON(secno >= TOTAL_SECS(sbi));
} else {
go_left = 1;
left_start = hint - 1;
}
}
if (go_left == 0)
goto skip_left;
while (test_bit(left_start, free_i->free_secmap)) {
if (left_start > 0) {
left_start--;
continue;
}
left_start = find_next_zero_bit(free_i->free_secmap,
TOTAL_SECS(sbi), 0);
BUG_ON(left_start >= TOTAL_SECS(sbi));
break;
}
secno = left_start;
skip_left:
hint = secno;
segno = secno * sbi->segs_per_sec;
zoneno = secno / sbi->secs_per_zone;
/* give up on finding another zone */
if (!init)
goto got_it;
if (sbi->secs_per_zone == 1)
goto got_it;
if (zoneno == old_zoneno)
goto got_it;
if (dir == ALLOC_LEFT) {
if (!go_left && zoneno + 1 >= total_zones)
goto got_it;
if (go_left && zoneno == 0)
goto got_it;
}
for (i = 0; i < NR_CURSEG_TYPE; i++)
if (CURSEG_I(sbi, i)->zone == zoneno)
break;
if (i < NR_CURSEG_TYPE) {
/* zone is in user, try another */
if (go_left)
hint = zoneno * sbi->secs_per_zone - 1;
else if (zoneno + 1 >= total_zones)
hint = 0;
else
hint = (zoneno + 1) * sbi->secs_per_zone;
init = false;
goto find_other_zone;
}
got_it:
/* set it as dirty segment in free segmap */
BUG_ON(test_bit(segno, free_i->free_segmap));
__set_inuse(sbi, segno);
*newseg = segno;
write_unlock(&free_i->segmap_lock);
}
static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
struct summary_footer *sum_footer;
curseg->segno = curseg->next_segno;
curseg->zone = GET_ZONENO_FROM_SEGNO(sbi, curseg->segno);
curseg->next_blkoff = 0;
curseg->next_segno = NULL_SEGNO;
sum_footer = &(curseg->sum_blk->footer);
memset(sum_footer, 0, sizeof(struct summary_footer));
if (IS_DATASEG(type))
SET_SUM_TYPE(sum_footer, SUM_TYPE_DATA);
if (IS_NODESEG(type))
SET_SUM_TYPE(sum_footer, SUM_TYPE_NODE);
__set_sit_entry_type(sbi, type, curseg->segno, modified);
}
/*
* Allocate a current working segment.
* This function always allocates a free segment in LFS manner.
*/
static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
unsigned int segno = curseg->segno;
int dir = ALLOC_LEFT;
write_sum_page(sbi, curseg->sum_blk,
GET_SUM_BLOCK(sbi, segno));
if (type == CURSEG_WARM_DATA || type == CURSEG_COLD_DATA)
dir = ALLOC_RIGHT;
if (test_opt(sbi, NOHEAP))
dir = ALLOC_RIGHT;
get_new_segment(sbi, &segno, new_sec, dir);
curseg->next_segno = segno;
reset_curseg(sbi, type, 1);
curseg->alloc_type = LFS;
}
static void __next_free_blkoff(struct f2fs_sb_info *sbi,
struct curseg_info *seg, block_t start)
{
struct seg_entry *se = get_seg_entry(sbi, seg->segno);
block_t ofs;
for (ofs = start; ofs < sbi->blocks_per_seg; ofs++) {
if (!f2fs_test_bit(ofs, se->ckpt_valid_map)
&& !f2fs_test_bit(ofs, se->cur_valid_map))
break;
}
seg->next_blkoff = ofs;
}
/*
* If a segment is written by LFS manner, next block offset is just obtained
* by increasing the current block offset. However, if a segment is written by
* SSR manner, next block offset obtained by calling __next_free_blkoff
*/
static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
struct curseg_info *seg)
{
if (seg->alloc_type == SSR)
__next_free_blkoff(sbi, seg, seg->next_blkoff + 1);
else
seg->next_blkoff++;
}
/*
* This function always allocates a used segment (from dirty seglist) by SSR
* manner, so it should recover the existing segment information of valid blocks
*/
static void change_curseg(struct f2fs_sb_info *sbi, int type, bool reuse)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
struct curseg_info *curseg = CURSEG_I(sbi, type);
unsigned int new_segno = curseg->next_segno;
struct f2fs_summary_block *sum_node;
struct page *sum_page;
write_sum_page(sbi, curseg->sum_blk,
GET_SUM_BLOCK(sbi, curseg->segno));
__set_test_and_inuse(sbi, new_segno);
mutex_lock(&dirty_i->seglist_lock);
__remove_dirty_segment(sbi, new_segno, PRE);
__remove_dirty_segment(sbi, new_segno, DIRTY);
mutex_unlock(&dirty_i->seglist_lock);
reset_curseg(sbi, type, 1);
curseg->alloc_type = SSR;
__next_free_blkoff(sbi, curseg, 0);
if (reuse) {
sum_page = get_sum_page(sbi, new_segno);
sum_node = (struct f2fs_summary_block *)page_address(sum_page);
memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
f2fs_put_page(sum_page, 1);
}
}
static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
if (IS_NODESEG(type) || !has_not_enough_free_secs(sbi, 0))
return v_ops->get_victim(sbi,
&(curseg)->next_segno, BG_GC, type, SSR);
/* For data segments, let's do SSR more intensively */
for (; type >= CURSEG_HOT_DATA; type--)
if (v_ops->get_victim(sbi, &(curseg)->next_segno,
BG_GC, type, SSR))
return 1;
return 0;
}
/*
* flush out current segment and replace it with new segment
* This function should be returned with success, otherwise BUG
*/
static void allocate_segment_by_default(struct f2fs_sb_info *sbi,
int type, bool force)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
if (force) {
new_curseg(sbi, type, true);
goto out;
}
if (type == CURSEG_WARM_NODE)
new_curseg(sbi, type, false);
else if (curseg->alloc_type == LFS && is_next_segment_free(sbi, type))
new_curseg(sbi, type, false);
else if (need_SSR(sbi) && get_ssr_segment(sbi, type))
change_curseg(sbi, type, true);
else
new_curseg(sbi, type, false);
out:
#ifdef CONFIG_F2FS_STAT_FS
sbi->segment_count[curseg->alloc_type]++;
#endif
return;
}
void allocate_new_segments(struct f2fs_sb_info *sbi)
{
struct curseg_info *curseg;
unsigned int old_curseg;
int i;
for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
curseg = CURSEG_I(sbi, i);
old_curseg = curseg->segno;
SIT_I(sbi)->s_ops->allocate_segment(sbi, i, true);
locate_dirty_segment(sbi, old_curseg);
}
}
static const struct segment_allocation default_salloc_ops = {
.allocate_segment = allocate_segment_by_default,
};
static void f2fs_end_io_write(struct bio *bio, int err)
{
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct bio_private *p = bio->bi_private;
do {
struct page *page = bvec->bv_page;
if (--bvec >= bio->bi_io_vec)
prefetchw(&bvec->bv_page->flags);
if (!uptodate) {
SetPageError(page);
if (page->mapping)
set_bit(AS_EIO, &page->mapping->flags);
set_ckpt_flags(p->sbi->ckpt, CP_ERROR_FLAG);
p->sbi->sb->s_flags |= MS_RDONLY;
}
end_page_writeback(page);
dec_page_count(p->sbi, F2FS_WRITEBACK);
} while (bvec >= bio->bi_io_vec);
if (p->is_sync)
complete(p->wait);
kfree(p);
bio_put(bio);
}
struct bio *f2fs_bio_alloc(struct block_device *bdev, int npages)
{
struct bio *bio;
struct bio_private *priv;
retry:
priv = kmalloc(sizeof(struct bio_private), GFP_NOFS);
if (!priv) {
cond_resched();
goto retry;
}
/* No failure on bio allocation */
bio = bio_alloc(GFP_NOIO, npages);
bio->bi_bdev = bdev;
bio->bi_private = priv;
return bio;
}
static void do_submit_bio(struct f2fs_sb_info *sbi,
enum page_type type, bool sync)
{
int rw = sync ? WRITE_SYNC : WRITE;
enum page_type btype = type > META ? META : type;
if (type >= META_FLUSH)
rw = WRITE_FLUSH_FUA;
if (btype == META)
rw |= REQ_META;
if (sbi->bio[btype]) {
struct bio_private *p = sbi->bio[btype]->bi_private;
p->sbi = sbi;
sbi->bio[btype]->bi_end_io = f2fs_end_io_write;
trace_f2fs_do_submit_bio(sbi->sb, btype, sync, sbi->bio[btype]);
if (type == META_FLUSH) {
DECLARE_COMPLETION_ONSTACK(wait);
p->is_sync = true;
p->wait = &wait;
submit_bio(rw, sbi->bio[btype]);
wait_for_completion(&wait);
} else {
p->is_sync = false;
submit_bio(rw, sbi->bio[btype]);
}
sbi->bio[btype] = NULL;
}
}
void f2fs_submit_bio(struct f2fs_sb_info *sbi, enum page_type type, bool sync)
{
down_write(&sbi->bio_sem);
do_submit_bio(sbi, type, sync);
up_write(&sbi->bio_sem);
}
static void submit_write_page(struct f2fs_sb_info *sbi, struct page *page,
block_t blk_addr, enum page_type type)
{
struct block_device *bdev = sbi->sb->s_bdev;
verify_block_addr(sbi, blk_addr);
down_write(&sbi->bio_sem);
inc_page_count(sbi, F2FS_WRITEBACK);
if (sbi->bio[type] && sbi->last_block_in_bio[type] != blk_addr - 1)
do_submit_bio(sbi, type, false);
alloc_new:
if (sbi->bio[type] == NULL) {
sbi->bio[type] = f2fs_bio_alloc(bdev, max_hw_blocks(sbi));
sbi->bio[type]->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
/*
* The end_io will be assigned at the sumbission phase.
* Until then, let bio_add_page() merge consecutive IOs as much
* as possible.
*/
}
if (bio_add_page(sbi->bio[type], page, PAGE_CACHE_SIZE, 0) <
PAGE_CACHE_SIZE) {
do_submit_bio(sbi, type, false);
goto alloc_new;
}
sbi->last_block_in_bio[type] = blk_addr;
up_write(&sbi->bio_sem);
trace_f2fs_submit_write_page(page, blk_addr, type);
}
static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
if (curseg->next_blkoff < sbi->blocks_per_seg)
return true;
return false;
}
static int __get_segment_type_2(struct page *page, enum page_type p_type)
{
if (p_type == DATA)
return CURSEG_HOT_DATA;
else
return CURSEG_HOT_NODE;
}
static int __get_segment_type_4(struct page *page, enum page_type p_type)
{
if (p_type == DATA) {
struct inode *inode = page->mapping->host;
if (S_ISDIR(inode->i_mode))
return CURSEG_HOT_DATA;
else
return CURSEG_COLD_DATA;
} else {
if (IS_DNODE(page) && !is_cold_node(page))
return CURSEG_HOT_NODE;
else
return CURSEG_COLD_NODE;
}
}
static int __get_segment_type_6(struct page *page, enum page_type p_type)
{
if (p_type == DATA) {
struct inode *inode = page->mapping->host;
if (S_ISDIR(inode->i_mode))
return CURSEG_HOT_DATA;
else if (is_cold_data(page) || file_is_cold(inode))
return CURSEG_COLD_DATA;
else
return CURSEG_WARM_DATA;
} else {
if (IS_DNODE(page))
return is_cold_node(page) ? CURSEG_WARM_NODE :
CURSEG_HOT_NODE;
else
return CURSEG_COLD_NODE;
}
}
static int __get_segment_type(struct page *page, enum page_type p_type)
{
struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
switch (sbi->active_logs) {
case 2:
return __get_segment_type_2(page, p_type);
case 4:
return __get_segment_type_4(page, p_type);
}
/* NR_CURSEG_TYPE(6) logs by default */
BUG_ON(sbi->active_logs != NR_CURSEG_TYPE);
return __get_segment_type_6(page, p_type);
}
static void do_write_page(struct f2fs_sb_info *sbi, struct page *page,
block_t old_blkaddr, block_t *new_blkaddr,
struct f2fs_summary *sum, enum page_type p_type)
{
struct sit_info *sit_i = SIT_I(sbi);
struct curseg_info *curseg;
unsigned int old_cursegno;
int type;
type = __get_segment_type(page, p_type);
curseg = CURSEG_I(sbi, type);
mutex_lock(&curseg->curseg_mutex);
*new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
old_cursegno = curseg->segno;
/*
* __add_sum_entry should be resided under the curseg_mutex
* because, this function updates a summary entry in the
* current summary block.
*/
__add_sum_entry(sbi, type, sum);
mutex_lock(&sit_i->sentry_lock);
__refresh_next_blkoff(sbi, curseg);
#ifdef CONFIG_F2FS_STAT_FS
sbi->block_count[curseg->alloc_type]++;
#endif
/*
* SIT information should be updated before segment allocation,
* since SSR needs latest valid block information.
*/
refresh_sit_entry(sbi, old_blkaddr, *new_blkaddr);
if (!__has_curseg_space(sbi, type))
sit_i->s_ops->allocate_segment(sbi, type, false);
locate_dirty_segment(sbi, old_cursegno);
locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
mutex_unlock(&sit_i->sentry_lock);
if (p_type == NODE)
fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg));
/* writeout dirty page into bdev */
submit_write_page(sbi, page, *new_blkaddr, p_type);
mutex_unlock(&curseg->curseg_mutex);
}
void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
{
set_page_writeback(page);
submit_write_page(sbi, page, page->index, META);
}
void write_node_page(struct f2fs_sb_info *sbi, struct page *page,
unsigned int nid, block_t old_blkaddr, block_t *new_blkaddr)
{
struct f2fs_summary sum;
set_summary(&sum, nid, 0, 0);
do_write_page(sbi, page, old_blkaddr, new_blkaddr, &sum, NODE);
}
void write_data_page(struct inode *inode, struct page *page,
struct dnode_of_data *dn, block_t old_blkaddr,
block_t *new_blkaddr)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
struct f2fs_summary sum;
struct node_info ni;
BUG_ON(old_blkaddr == NULL_ADDR);
get_node_info(sbi, dn->nid, &ni);
set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
do_write_page(sbi, page, old_blkaddr,
new_blkaddr, &sum, DATA);
}
void rewrite_data_page(struct f2fs_sb_info *sbi, struct page *page,
block_t old_blk_addr)
{
submit_write_page(sbi, page, old_blk_addr, DATA);
}
void recover_data_page(struct f2fs_sb_info *sbi,
struct page *page, struct f2fs_summary *sum,
block_t old_blkaddr, block_t new_blkaddr)
{
struct sit_info *sit_i = SIT_I(sbi);
struct curseg_info *curseg;
unsigned int segno, old_cursegno;
struct seg_entry *se;
int type;
segno = GET_SEGNO(sbi, new_blkaddr);
se = get_seg_entry(sbi, segno);
type = se->type;
if (se->valid_blocks == 0 && !IS_CURSEG(sbi, segno)) {
if (old_blkaddr == NULL_ADDR)
type = CURSEG_COLD_DATA;
else
type = CURSEG_WARM_DATA;
}
curseg = CURSEG_I(sbi, type);
mutex_lock(&curseg->curseg_mutex);
mutex_lock(&sit_i->sentry_lock);
old_cursegno = curseg->segno;
/* change the current segment */
if (segno != curseg->segno) {
curseg->next_segno = segno;
change_curseg(sbi, type, true);
}
curseg->next_blkoff = GET_SEGOFF_FROM_SEG0(sbi, new_blkaddr) &
(sbi->blocks_per_seg - 1);
__add_sum_entry(sbi, type, sum);
refresh_sit_entry(sbi, old_blkaddr, new_blkaddr);
locate_dirty_segment(sbi, old_cursegno);
locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
mutex_unlock(&sit_i->sentry_lock);
mutex_unlock(&curseg->curseg_mutex);
}
void rewrite_node_page(struct f2fs_sb_info *sbi,
struct page *page, struct f2fs_summary *sum,
block_t old_blkaddr, block_t new_blkaddr)
{
struct sit_info *sit_i = SIT_I(sbi);
int type = CURSEG_WARM_NODE;
struct curseg_info *curseg;
unsigned int segno, old_cursegno;
block_t next_blkaddr = next_blkaddr_of_node(page);
unsigned int next_segno = GET_SEGNO(sbi, next_blkaddr);
curseg = CURSEG_I(sbi, type);
mutex_lock(&curseg->curseg_mutex);
mutex_lock(&sit_i->sentry_lock);
segno = GET_SEGNO(sbi, new_blkaddr);
old_cursegno = curseg->segno;
/* change the current segment */
if (segno != curseg->segno) {
curseg->next_segno = segno;
change_curseg(sbi, type, true);
}
curseg->next_blkoff = GET_SEGOFF_FROM_SEG0(sbi, new_blkaddr) &
(sbi->blocks_per_seg - 1);
__add_sum_entry(sbi, type, sum);
/* change the current log to the next block addr in advance */
if (next_segno != segno) {
curseg->next_segno = next_segno;
change_curseg(sbi, type, true);
}
curseg->next_blkoff = GET_SEGOFF_FROM_SEG0(sbi, next_blkaddr) &
(sbi->blocks_per_seg - 1);
/* rewrite node page */
set_page_writeback(page);
submit_write_page(sbi, page, new_blkaddr, NODE);
f2fs_submit_bio(sbi, NODE, true);
refresh_sit_entry(sbi, old_blkaddr, new_blkaddr);
locate_dirty_segment(sbi, old_cursegno);
locate_dirty_segment(sbi, GET_SEGNO(sbi, old_blkaddr));
mutex_unlock(&sit_i->sentry_lock);
mutex_unlock(&curseg->curseg_mutex);
}
static int read_compacted_summaries(struct f2fs_sb_info *sbi)
{
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
struct curseg_info *seg_i;
unsigned char *kaddr;
struct page *page;
block_t start;
int i, j, offset;
start = start_sum_block(sbi);
page = get_meta_page(sbi, start++);
kaddr = (unsigned char *)page_address(page);
/* Step 1: restore nat cache */
seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
memcpy(&seg_i->sum_blk->n_nats, kaddr, SUM_JOURNAL_SIZE);
/* Step 2: restore sit cache */
seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
memcpy(&seg_i->sum_blk->n_sits, kaddr + SUM_JOURNAL_SIZE,
SUM_JOURNAL_SIZE);
offset = 2 * SUM_JOURNAL_SIZE;
/* Step 3: restore summary entries */
for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
unsigned short blk_off;
unsigned int segno;
seg_i = CURSEG_I(sbi, i);
segno = le32_to_cpu(ckpt->cur_data_segno[i]);
blk_off = le16_to_cpu(ckpt->cur_data_blkoff[i]);
seg_i->next_segno = segno;
reset_curseg(sbi, i, 0);
seg_i->alloc_type = ckpt->alloc_type[i];
seg_i->next_blkoff = blk_off;
if (seg_i->alloc_type == SSR)
blk_off = sbi->blocks_per_seg;
for (j = 0; j < blk_off; j++) {
struct f2fs_summary *s;
s = (struct f2fs_summary *)(kaddr + offset);
seg_i->sum_blk->entries[j] = *s;
offset += SUMMARY_SIZE;
if (offset + SUMMARY_SIZE <= PAGE_CACHE_SIZE -
SUM_FOOTER_SIZE)
continue;
f2fs_put_page(page, 1);
page = NULL;
page = get_meta_page(sbi, start++);
kaddr = (unsigned char *)page_address(page);
offset = 0;
}
}
f2fs_put_page(page, 1);
return 0;
}
static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
{
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
struct f2fs_summary_block *sum;
struct curseg_info *curseg;
struct page *new;
unsigned short blk_off;
unsigned int segno = 0;
block_t blk_addr = 0;
/* get segment number and block addr */
if (IS_DATASEG(type)) {
segno = le32_to_cpu(ckpt->cur_data_segno[type]);
blk_off = le16_to_cpu(ckpt->cur_data_blkoff[type -
CURSEG_HOT_DATA]);
if (is_set_ckpt_flags(ckpt, CP_UMOUNT_FLAG))
blk_addr = sum_blk_addr(sbi, NR_CURSEG_TYPE, type);
else
blk_addr = sum_blk_addr(sbi, NR_CURSEG_DATA_TYPE, type);
} else {
segno = le32_to_cpu(ckpt->cur_node_segno[type -
CURSEG_HOT_NODE]);
blk_off = le16_to_cpu(ckpt->cur_node_blkoff[type -
CURSEG_HOT_NODE]);
if (is_set_ckpt_flags(ckpt, CP_UMOUNT_FLAG))
blk_addr = sum_blk_addr(sbi, NR_CURSEG_NODE_TYPE,
type - CURSEG_HOT_NODE);
else
blk_addr = GET_SUM_BLOCK(sbi, segno);
}
new = get_meta_page(sbi, blk_addr);
sum = (struct f2fs_summary_block *)page_address(new);
if (IS_NODESEG(type)) {
if (is_set_ckpt_flags(ckpt, CP_UMOUNT_FLAG)) {
struct f2fs_summary *ns = &sum->entries[0];
int i;
for (i = 0; i < sbi->blocks_per_seg; i++, ns++) {
ns->version = 0;
ns->ofs_in_node = 0;
}
} else {
if (restore_node_summary(sbi, segno, sum)) {
f2fs_put_page(new, 1);
return -EINVAL;
}
}
}
/* set uncompleted segment to curseg */
curseg = CURSEG_I(sbi, type);
mutex_lock(&curseg->curseg_mutex);
memcpy(curseg->sum_blk, sum, PAGE_CACHE_SIZE);
curseg->next_segno = segno;
reset_curseg(sbi, type, 0);
curseg->alloc_type = ckpt->alloc_type[type];
curseg->next_blkoff = blk_off;
mutex_unlock(&curseg->curseg_mutex);
f2fs_put_page(new, 1);
return 0;
}
static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
{
int type = CURSEG_HOT_DATA;
if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG)) {
/* restore for compacted data summary */
if (read_compacted_summaries(sbi))
return -EINVAL;
type = CURSEG_HOT_NODE;
}
for (; type <= CURSEG_COLD_NODE; type++)
if (read_normal_summaries(sbi, type))
return -EINVAL;
return 0;
}
static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr)
{
struct page *page;
unsigned char *kaddr;
struct f2fs_summary *summary;
struct curseg_info *seg_i;
int written_size = 0;
int i, j;
page = grab_meta_page(sbi, blkaddr++);
kaddr = (unsigned char *)page_address(page);
/* Step 1: write nat cache */
seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
memcpy(kaddr, &seg_i->sum_blk->n_nats, SUM_JOURNAL_SIZE);
written_size += SUM_JOURNAL_SIZE;
/* Step 2: write sit cache */
seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
memcpy(kaddr + written_size, &seg_i->sum_blk->n_sits,
SUM_JOURNAL_SIZE);
written_size += SUM_JOURNAL_SIZE;
set_page_dirty(page);
/* Step 3: write summary entries */
for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
unsigned short blkoff;
seg_i = CURSEG_I(sbi, i);
if (sbi->ckpt->alloc_type[i] == SSR)
blkoff = sbi->blocks_per_seg;
else
blkoff = curseg_blkoff(sbi, i);
for (j = 0; j < blkoff; j++) {
if (!page) {
page = grab_meta_page(sbi, blkaddr++);
kaddr = (unsigned char *)page_address(page);
written_size = 0;
}
summary = (struct f2fs_summary *)(kaddr + written_size);
*summary = seg_i->sum_blk->entries[j];
written_size += SUMMARY_SIZE;
set_page_dirty(page);
if (written_size + SUMMARY_SIZE <= PAGE_CACHE_SIZE -
SUM_FOOTER_SIZE)
continue;
f2fs_put_page(page, 1);
page = NULL;
}
}
if (page)
f2fs_put_page(page, 1);
}
static void write_normal_summaries(struct f2fs_sb_info *sbi,
block_t blkaddr, int type)
{
int i, end;
if (IS_DATASEG(type))
end = type + NR_CURSEG_DATA_TYPE;
else
end = type + NR_CURSEG_NODE_TYPE;
for (i = type; i < end; i++) {
struct curseg_info *sum = CURSEG_I(sbi, i);
mutex_lock(&sum->curseg_mutex);
write_sum_page(sbi, sum->sum_blk, blkaddr + (i - type));
mutex_unlock(&sum->curseg_mutex);
}
}
void write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
{
if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG))
write_compacted_summaries(sbi, start_blk);
else
write_normal_summaries(sbi, start_blk, CURSEG_HOT_DATA);
}
void write_node_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
{
if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG))
write_normal_summaries(sbi, start_blk, CURSEG_HOT_NODE);
return;
}
int lookup_journal_in_cursum(struct f2fs_summary_block *sum, int type,
unsigned int val, int alloc)
{
int i;
if (type == NAT_JOURNAL) {
for (i = 0; i < nats_in_cursum(sum); i++) {
if (le32_to_cpu(nid_in_journal(sum, i)) == val)
return i;
}
if (alloc && nats_in_cursum(sum) < NAT_JOURNAL_ENTRIES)
return update_nats_in_cursum(sum, 1);
} else if (type == SIT_JOURNAL) {
for (i = 0; i < sits_in_cursum(sum); i++)
if (le32_to_cpu(segno_in_journal(sum, i)) == val)
return i;
if (alloc && sits_in_cursum(sum) < SIT_JOURNAL_ENTRIES)
return update_sits_in_cursum(sum, 1);
}
return -1;
}
static struct page *get_current_sit_page(struct f2fs_sb_info *sbi,
unsigned int segno)
{
struct sit_info *sit_i = SIT_I(sbi);
unsigned int offset = SIT_BLOCK_OFFSET(sit_i, segno);
block_t blk_addr = sit_i->sit_base_addr + offset;
check_seg_range(sbi, segno);
/* calculate sit block address */
if (f2fs_test_bit(offset, sit_i->sit_bitmap))
blk_addr += sit_i->sit_blocks;
return get_meta_page(sbi, blk_addr);
}
static struct page *get_next_sit_page(struct f2fs_sb_info *sbi,
unsigned int start)
{
struct sit_info *sit_i = SIT_I(sbi);
struct page *src_page, *dst_page;
pgoff_t src_off, dst_off;
void *src_addr, *dst_addr;
src_off = current_sit_addr(sbi, start);
dst_off = next_sit_addr(sbi, src_off);
/* get current sit block page without lock */
src_page = get_meta_page(sbi, src_off);
dst_page = grab_meta_page(sbi, dst_off);
BUG_ON(PageDirty(src_page));
src_addr = page_address(src_page);
dst_addr = page_address(dst_page);
memcpy(dst_addr, src_addr, PAGE_CACHE_SIZE);
set_page_dirty(dst_page);
f2fs_put_page(src_page, 1);
set_to_next_sit(sit_i, start);
return dst_page;
}
static bool flush_sits_in_journal(struct f2fs_sb_info *sbi)
{
struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
struct f2fs_summary_block *sum = curseg->sum_blk;
int i;
/*
* If the journal area in the current summary is full of sit entries,
* all the sit entries will be flushed. Otherwise the sit entries
* are not able to replace with newly hot sit entries.
*/
if (sits_in_cursum(sum) >= SIT_JOURNAL_ENTRIES) {
for (i = sits_in_cursum(sum) - 1; i >= 0; i--) {
unsigned int segno;
segno = le32_to_cpu(segno_in_journal(sum, i));
__mark_sit_entry_dirty(sbi, segno);
}
update_sits_in_cursum(sum, -sits_in_cursum(sum));
return 1;
}
return 0;
}
/*
* CP calls this function, which flushes SIT entries including sit_journal,
* and moves prefree segs to free segs.
*/
void flush_sit_entries(struct f2fs_sb_info *sbi)
{
struct sit_info *sit_i = SIT_I(sbi);
unsigned long *bitmap = sit_i->dirty_sentries_bitmap;
struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
struct f2fs_summary_block *sum = curseg->sum_blk;
unsigned long nsegs = TOTAL_SEGS(sbi);
struct page *page = NULL;
struct f2fs_sit_block *raw_sit = NULL;
unsigned int start = 0, end = 0;
unsigned int segno = -1;
bool flushed;
mutex_lock(&curseg->curseg_mutex);
mutex_lock(&sit_i->sentry_lock);
/*
* "flushed" indicates whether sit entries in journal are flushed
* to the SIT area or not.
*/
flushed = flush_sits_in_journal(sbi);
while ((segno = find_next_bit(bitmap, nsegs, segno + 1)) < nsegs) {
struct seg_entry *se = get_seg_entry(sbi, segno);
int sit_offset, offset;
sit_offset = SIT_ENTRY_OFFSET(sit_i, segno);
if (flushed)
goto to_sit_page;
offset = lookup_journal_in_cursum(sum, SIT_JOURNAL, segno, 1);
if (offset >= 0) {
segno_in_journal(sum, offset) = cpu_to_le32(segno);
seg_info_to_raw_sit(se, &sit_in_journal(sum, offset));
goto flush_done;
}
to_sit_page:
if (!page || (start > segno) || (segno > end)) {
if (page) {
f2fs_put_page(page, 1);
page = NULL;
}
start = START_SEGNO(sit_i, segno);
end = start + SIT_ENTRY_PER_BLOCK - 1;
/* read sit block that will be updated */
page = get_next_sit_page(sbi, start);
raw_sit = page_address(page);
}
/* udpate entry in SIT block */
seg_info_to_raw_sit(se, &raw_sit->entries[sit_offset]);
flush_done:
__clear_bit(segno, bitmap);
sit_i->dirty_sentries--;
}
mutex_unlock(&sit_i->sentry_lock);
mutex_unlock(&curseg->curseg_mutex);
/* writeout last modified SIT block */
f2fs_put_page(page, 1);
set_prefree_as_free_segments(sbi);
}
static int build_sit_info(struct f2fs_sb_info *sbi)
{
struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
struct sit_info *sit_i;
unsigned int sit_segs, start;
char *src_bitmap, *dst_bitmap;
unsigned int bitmap_size;
/* allocate memory for SIT information */
sit_i = kzalloc(sizeof(struct sit_info), GFP_KERNEL);
if (!sit_i)
return -ENOMEM;
SM_I(sbi)->sit_info = sit_i;
sit_i->sentries = vzalloc(TOTAL_SEGS(sbi) * sizeof(struct seg_entry));
if (!sit_i->sentries)
return -ENOMEM;
bitmap_size = f2fs_bitmap_size(TOTAL_SEGS(sbi));
sit_i->dirty_sentries_bitmap = kzalloc(bitmap_size, GFP_KERNEL);
if (!sit_i->dirty_sentries_bitmap)
return -ENOMEM;
for (start = 0; start < TOTAL_SEGS(sbi); start++) {
sit_i->sentries[start].cur_valid_map
= kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
sit_i->sentries[start].ckpt_valid_map
= kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
if (!sit_i->sentries[start].cur_valid_map
|| !sit_i->sentries[start].ckpt_valid_map)
return -ENOMEM;
}
if (sbi->segs_per_sec > 1) {
sit_i->sec_entries = vzalloc(TOTAL_SECS(sbi) *
sizeof(struct sec_entry));
if (!sit_i->sec_entries)
return -ENOMEM;
}
/* get information related with SIT */
sit_segs = le32_to_cpu(raw_super->segment_count_sit) >> 1;
/* setup SIT bitmap from ckeckpoint pack */
bitmap_size = __bitmap_size(sbi, SIT_BITMAP);
src_bitmap = __bitmap_ptr(sbi, SIT_BITMAP);
dst_bitmap = kmemdup(src_bitmap, bitmap_size, GFP_KERNEL);
if (!dst_bitmap)
return -ENOMEM;
/* init SIT information */
sit_i->s_ops = &default_salloc_ops;
sit_i->sit_base_addr = le32_to_cpu(raw_super->sit_blkaddr);
sit_i->sit_blocks = sit_segs << sbi->log_blocks_per_seg;
sit_i->written_valid_blocks = le64_to_cpu(ckpt->valid_block_count);
sit_i->sit_bitmap = dst_bitmap;
sit_i->bitmap_size = bitmap_size;
sit_i->dirty_sentries = 0;
sit_i->sents_per_block = SIT_ENTRY_PER_BLOCK;
sit_i->elapsed_time = le64_to_cpu(sbi->ckpt->elapsed_time);
sit_i->mounted_time = CURRENT_TIME_SEC.tv_sec;
mutex_init(&sit_i->sentry_lock);
return 0;
}
static int build_free_segmap(struct f2fs_sb_info *sbi)
{
struct f2fs_sm_info *sm_info = SM_I(sbi);
struct free_segmap_info *free_i;
unsigned int bitmap_size, sec_bitmap_size;
/* allocate memory for free segmap information */
free_i = kzalloc(sizeof(struct free_segmap_info), GFP_KERNEL);
if (!free_i)
return -ENOMEM;
SM_I(sbi)->free_info = free_i;
bitmap_size = f2fs_bitmap_size(TOTAL_SEGS(sbi));
free_i->free_segmap = kmalloc(bitmap_size, GFP_KERNEL);
if (!free_i->free_segmap)
return -ENOMEM;
sec_bitmap_size = f2fs_bitmap_size(TOTAL_SECS(sbi));
free_i->free_secmap = kmalloc(sec_bitmap_size, GFP_KERNEL);
if (!free_i->free_secmap)
return -ENOMEM;
/* set all segments as dirty temporarily */
memset(free_i->free_segmap, 0xff, bitmap_size);
memset(free_i->free_secmap, 0xff, sec_bitmap_size);
/* init free segmap information */
free_i->start_segno =
(unsigned int) GET_SEGNO_FROM_SEG0(sbi, sm_info->main_blkaddr);
free_i->free_segments = 0;
free_i->free_sections = 0;
rwlock_init(&free_i->segmap_lock);
return 0;
}
static int build_curseg(struct f2fs_sb_info *sbi)
{
struct curseg_info *array;
int i;
array = kzalloc(sizeof(*array) * NR_CURSEG_TYPE, GFP_KERNEL);
if (!array)
return -ENOMEM;
SM_I(sbi)->curseg_array = array;
for (i = 0; i < NR_CURSEG_TYPE; i++) {
mutex_init(&array[i].curseg_mutex);
array[i].sum_blk = kzalloc(PAGE_CACHE_SIZE, GFP_KERNEL);
if (!array[i].sum_blk)
return -ENOMEM;
array[i].segno = NULL_SEGNO;
array[i].next_blkoff = 0;
}
return restore_curseg_summaries(sbi);
}
static void build_sit_entries(struct f2fs_sb_info *sbi)
{
struct sit_info *sit_i = SIT_I(sbi);
struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
struct f2fs_summary_block *sum = curseg->sum_blk;
unsigned int start;
for (start = 0; start < TOTAL_SEGS(sbi); start++) {
struct seg_entry *se = &sit_i->sentries[start];
struct f2fs_sit_block *sit_blk;
struct f2fs_sit_entry sit;
struct page *page;
int i;
mutex_lock(&curseg->curseg_mutex);
for (i = 0; i < sits_in_cursum(sum); i++) {
if (le32_to_cpu(segno_in_journal(sum, i)) == start) {
sit = sit_in_journal(sum, i);
mutex_unlock(&curseg->curseg_mutex);
goto got_it;
}
}
mutex_unlock(&curseg->curseg_mutex);
page = get_current_sit_page(sbi, start);
sit_blk = (struct f2fs_sit_block *)page_address(page);
sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
f2fs_put_page(page, 1);
got_it:
check_block_count(sbi, start, &sit);
seg_info_from_raw_sit(se, &sit);
if (sbi->segs_per_sec > 1) {
struct sec_entry *e = get_sec_entry(sbi, start);
e->valid_blocks += se->valid_blocks;
}
}
}
static void init_free_segmap(struct f2fs_sb_info *sbi)
{
unsigned int start;
int type;
for (start = 0; start < TOTAL_SEGS(sbi); start++) {
struct seg_entry *sentry = get_seg_entry(sbi, start);
if (!sentry->valid_blocks)
__set_free(sbi, start);
}
/* set use the current segments */
for (type = CURSEG_HOT_DATA; type <= CURSEG_COLD_NODE; type++) {
struct curseg_info *curseg_t = CURSEG_I(sbi, type);
__set_test_and_inuse(sbi, curseg_t->segno);
}
}
static void init_dirty_segmap(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
struct free_segmap_info *free_i = FREE_I(sbi);
unsigned int segno = 0, offset = 0, total_segs = TOTAL_SEGS(sbi);
unsigned short valid_blocks;
while (1) {
/* find dirty segment based on free segmap */
segno = find_next_inuse(free_i, total_segs, offset);
if (segno >= total_segs)
break;
offset = segno + 1;
valid_blocks = get_valid_blocks(sbi, segno, 0);
if (valid_blocks >= sbi->blocks_per_seg || !valid_blocks)
continue;
mutex_lock(&dirty_i->seglist_lock);
__locate_dirty_segment(sbi, segno, DIRTY);
mutex_unlock(&dirty_i->seglist_lock);
}
}
static int init_victim_secmap(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
unsigned int bitmap_size = f2fs_bitmap_size(TOTAL_SECS(sbi));
dirty_i->victim_secmap = kzalloc(bitmap_size, GFP_KERNEL);
if (!dirty_i->victim_secmap)
return -ENOMEM;
return 0;
}
static int build_dirty_segmap(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i;
unsigned int bitmap_size, i;
/* allocate memory for dirty segments list information */
dirty_i = kzalloc(sizeof(struct dirty_seglist_info), GFP_KERNEL);
if (!dirty_i)
return -ENOMEM;
SM_I(sbi)->dirty_info = dirty_i;
mutex_init(&dirty_i->seglist_lock);
bitmap_size = f2fs_bitmap_size(TOTAL_SEGS(sbi));
for (i = 0; i < NR_DIRTY_TYPE; i++) {
dirty_i->dirty_segmap[i] = kzalloc(bitmap_size, GFP_KERNEL);
if (!dirty_i->dirty_segmap[i])
return -ENOMEM;
}
init_dirty_segmap(sbi);
return init_victim_secmap(sbi);
}
/*
* Update min, max modified time for cost-benefit GC algorithm
*/
static void init_min_max_mtime(struct f2fs_sb_info *sbi)
{
struct sit_info *sit_i = SIT_I(sbi);
unsigned int segno;
mutex_lock(&sit_i->sentry_lock);
sit_i->min_mtime = LLONG_MAX;
for (segno = 0; segno < TOTAL_SEGS(sbi); segno += sbi->segs_per_sec) {
unsigned int i;
unsigned long long mtime = 0;
for (i = 0; i < sbi->segs_per_sec; i++)
mtime += get_seg_entry(sbi, segno + i)->mtime;
mtime = div_u64(mtime, sbi->segs_per_sec);
if (sit_i->min_mtime > mtime)
sit_i->min_mtime = mtime;
}
sit_i->max_mtime = get_mtime(sbi);
mutex_unlock(&sit_i->sentry_lock);
}
int build_segment_manager(struct f2fs_sb_info *sbi)
{
struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
struct f2fs_sm_info *sm_info;
int err;
sm_info = kzalloc(sizeof(struct f2fs_sm_info), GFP_KERNEL);
if (!sm_info)
return -ENOMEM;
/* init sm info */
sbi->sm_info = sm_info;
INIT_LIST_HEAD(&sm_info->wblist_head);
spin_lock_init(&sm_info->wblist_lock);
sm_info->seg0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
sm_info->main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
sm_info->segment_count = le32_to_cpu(raw_super->segment_count);
sm_info->reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
sm_info->ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
err = build_sit_info(sbi);
if (err)
return err;
err = build_free_segmap(sbi);
if (err)
return err;
err = build_curseg(sbi);
if (err)
return err;
/* reinit free segmap based on SIT */
build_sit_entries(sbi);
init_free_segmap(sbi);
err = build_dirty_segmap(sbi);
if (err)
return err;
init_min_max_mtime(sbi);
return 0;
}
static void discard_dirty_segmap(struct f2fs_sb_info *sbi,
enum dirty_type dirty_type)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
mutex_lock(&dirty_i->seglist_lock);
kfree(dirty_i->dirty_segmap[dirty_type]);
dirty_i->nr_dirty[dirty_type] = 0;
mutex_unlock(&dirty_i->seglist_lock);
}
static void destroy_victim_secmap(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
kfree(dirty_i->victim_secmap);
}
static void destroy_dirty_segmap(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
int i;
if (!dirty_i)
return;
/* discard pre-free/dirty segments list */
for (i = 0; i < NR_DIRTY_TYPE; i++)
discard_dirty_segmap(sbi, i);
destroy_victim_secmap(sbi);
SM_I(sbi)->dirty_info = NULL;
kfree(dirty_i);
}
static void destroy_curseg(struct f2fs_sb_info *sbi)
{
struct curseg_info *array = SM_I(sbi)->curseg_array;
int i;
if (!array)
return;
SM_I(sbi)->curseg_array = NULL;
for (i = 0; i < NR_CURSEG_TYPE; i++)
kfree(array[i].sum_blk);
kfree(array);
}
static void destroy_free_segmap(struct f2fs_sb_info *sbi)
{
struct free_segmap_info *free_i = SM_I(sbi)->free_info;
if (!free_i)
return;
SM_I(sbi)->free_info = NULL;
kfree(free_i->free_segmap);
kfree(free_i->free_secmap);
kfree(free_i);
}
static void destroy_sit_info(struct f2fs_sb_info *sbi)
{
struct sit_info *sit_i = SIT_I(sbi);
unsigned int start;
if (!sit_i)
return;
if (sit_i->sentries) {
for (start = 0; start < TOTAL_SEGS(sbi); start++) {
kfree(sit_i->sentries[start].cur_valid_map);
kfree(sit_i->sentries[start].ckpt_valid_map);
}
}
vfree(sit_i->sentries);
vfree(sit_i->sec_entries);
kfree(sit_i->dirty_sentries_bitmap);
SM_I(sbi)->sit_info = NULL;
kfree(sit_i->sit_bitmap);
kfree(sit_i);
}
void destroy_segment_manager(struct f2fs_sb_info *sbi)
{
struct f2fs_sm_info *sm_info = SM_I(sbi);
destroy_dirty_segmap(sbi);
destroy_curseg(sbi);
destroy_free_segmap(sbi);
destroy_sit_info(sbi);
sbi->sm_info = NULL;
kfree(sm_info);
}
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