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segment.c
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segment.c
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// SPDX-License-Identifier: GPL-2.0
/*
* fs/f2fs/segment.c
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*/
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/sched/mm.h>
#include <linux/prefetch.h>
#include <linux/kthread.h>
#include <linux/swap.h>
#include <linux/timer.h>
#include <linux/freezer.h>
#include <linux/sched/signal.h>
#include <linux/random.h>
#include "f2fs.h"
#include "segment.h"
#include "node.h"
#include "gc.h"
#include "iostat.h"
#include <trace/events/f2fs.h>
#define __reverse_ffz(x) __reverse_ffs(~(x))
static struct kmem_cache *discard_entry_slab;
static struct kmem_cache *discard_cmd_slab;
static struct kmem_cache *sit_entry_set_slab;
static struct kmem_cache *revoke_entry_slab;
static unsigned long __reverse_ulong(unsigned char *str)
{
unsigned long tmp = 0;
int shift = 24, idx = 0;
#if BITS_PER_LONG == 64
shift = 56;
#endif
while (shift >= 0) {
tmp |= (unsigned long)str[idx++] << shift;
shift -= BITS_PER_BYTE;
}
return tmp;
}
/*
* __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since
* MSB and LSB are reversed in a byte by f2fs_set_bit.
*/
static inline unsigned long __reverse_ffs(unsigned long word)
{
int num = 0;
#if BITS_PER_LONG == 64
if ((word & 0xffffffff00000000UL) == 0)
num += 32;
else
word >>= 32;
#endif
if ((word & 0xffff0000) == 0)
num += 16;
else
word >>= 16;
if ((word & 0xff00) == 0)
num += 8;
else
word >>= 8;
if ((word & 0xf0) == 0)
num += 4;
else
word >>= 4;
if ((word & 0xc) == 0)
num += 2;
else
word >>= 2;
if ((word & 0x2) == 0)
num += 1;
return num;
}
/*
* __find_rev_next(_zero)_bit is copied from lib/find_next_bit.c because
* f2fs_set_bit makes MSB and LSB reversed in a byte.
* @size must be integral times of unsigned long.
* Example:
* MSB <--> LSB
* f2fs_set_bit(0, bitmap) => 1000 0000
* f2fs_set_bit(7, bitmap) => 0000 0001
*/
static unsigned long __find_rev_next_bit(const unsigned long *addr,
unsigned long size, unsigned long offset)
{
const unsigned long *p = addr + BIT_WORD(offset);
unsigned long result = size;
unsigned long tmp;
if (offset >= size)
return size;
size -= (offset & ~(BITS_PER_LONG - 1));
offset %= BITS_PER_LONG;
while (1) {
if (*p == 0)
goto pass;
tmp = __reverse_ulong((unsigned char *)p);
tmp &= ~0UL >> offset;
if (size < BITS_PER_LONG)
tmp &= (~0UL << (BITS_PER_LONG - size));
if (tmp)
goto found;
pass:
if (size <= BITS_PER_LONG)
break;
size -= BITS_PER_LONG;
offset = 0;
p++;
}
return result;
found:
return result - size + __reverse_ffs(tmp);
}
static unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
unsigned long size, unsigned long offset)
{
const unsigned long *p = addr + BIT_WORD(offset);
unsigned long result = size;
unsigned long tmp;
if (offset >= size)
return size;
size -= (offset & ~(BITS_PER_LONG - 1));
offset %= BITS_PER_LONG;
while (1) {
if (*p == ~0UL)
goto pass;
tmp = __reverse_ulong((unsigned char *)p);
if (offset)
tmp |= ~0UL << (BITS_PER_LONG - offset);
if (size < BITS_PER_LONG)
tmp |= ~0UL >> size;
if (tmp != ~0UL)
goto found;
pass:
if (size <= BITS_PER_LONG)
break;
size -= BITS_PER_LONG;
offset = 0;
p++;
}
return result;
found:
return result - size + __reverse_ffz(tmp);
}
bool f2fs_need_SSR(struct f2fs_sb_info *sbi)
{
int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
int imeta_secs = get_blocktype_secs(sbi, F2FS_DIRTY_IMETA);
if (f2fs_lfs_mode(sbi))
return false;
if (sbi->gc_mode == GC_URGENT_HIGH)
return true;
if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
return true;
return free_sections(sbi) <= (node_secs + 2 * dent_secs + imeta_secs +
SM_I(sbi)->min_ssr_sections + reserved_sections(sbi));
}
void f2fs_abort_atomic_write(struct inode *inode, bool clean)
{
struct f2fs_inode_info *fi = F2FS_I(inode);
if (!f2fs_is_atomic_file(inode))
return;
release_atomic_write_cnt(inode);
clear_inode_flag(inode, FI_ATOMIC_COMMITTED);
clear_inode_flag(inode, FI_ATOMIC_REPLACE);
clear_inode_flag(inode, FI_ATOMIC_FILE);
stat_dec_atomic_inode(inode);
F2FS_I(inode)->atomic_write_task = NULL;
if (clean) {
truncate_inode_pages_final(inode->i_mapping);
f2fs_i_size_write(inode, fi->original_i_size);
fi->original_i_size = 0;
}
/* avoid stale dirty inode during eviction */
sync_inode_metadata(inode, 0);
}
static int __replace_atomic_write_block(struct inode *inode, pgoff_t index,
block_t new_addr, block_t *old_addr, bool recover)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct dnode_of_data dn;
struct node_info ni;
int err;
retry:
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = f2fs_get_dnode_of_data(&dn, index, ALLOC_NODE);
if (err) {
if (err == -ENOMEM) {
f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
goto retry;
}
return err;
}
err = f2fs_get_node_info(sbi, dn.nid, &ni, false);
if (err) {
f2fs_put_dnode(&dn);
return err;
}
if (recover) {
/* dn.data_blkaddr is always valid */
if (!__is_valid_data_blkaddr(new_addr)) {
if (new_addr == NULL_ADDR)
dec_valid_block_count(sbi, inode, 1);
f2fs_invalidate_blocks(sbi, dn.data_blkaddr);
f2fs_update_data_blkaddr(&dn, new_addr);
} else {
f2fs_replace_block(sbi, &dn, dn.data_blkaddr,
new_addr, ni.version, true, true);
}
} else {
blkcnt_t count = 1;
err = inc_valid_block_count(sbi, inode, &count);
if (err) {
f2fs_put_dnode(&dn);
return err;
}
*old_addr = dn.data_blkaddr;
f2fs_truncate_data_blocks_range(&dn, 1);
dec_valid_block_count(sbi, F2FS_I(inode)->cow_inode, count);
f2fs_replace_block(sbi, &dn, dn.data_blkaddr, new_addr,
ni.version, true, false);
}
f2fs_put_dnode(&dn);
trace_f2fs_replace_atomic_write_block(inode, F2FS_I(inode)->cow_inode,
index, old_addr ? *old_addr : 0, new_addr, recover);
return 0;
}
static void __complete_revoke_list(struct inode *inode, struct list_head *head,
bool revoke)
{
struct revoke_entry *cur, *tmp;
pgoff_t start_index = 0;
bool truncate = is_inode_flag_set(inode, FI_ATOMIC_REPLACE);
list_for_each_entry_safe(cur, tmp, head, list) {
if (revoke) {
__replace_atomic_write_block(inode, cur->index,
cur->old_addr, NULL, true);
} else if (truncate) {
f2fs_truncate_hole(inode, start_index, cur->index);
start_index = cur->index + 1;
}
list_del(&cur->list);
kmem_cache_free(revoke_entry_slab, cur);
}
if (!revoke && truncate)
f2fs_do_truncate_blocks(inode, start_index * PAGE_SIZE, false);
}
static int __f2fs_commit_atomic_write(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct f2fs_inode_info *fi = F2FS_I(inode);
struct inode *cow_inode = fi->cow_inode;
struct revoke_entry *new;
struct list_head revoke_list;
block_t blkaddr;
struct dnode_of_data dn;
pgoff_t len = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
pgoff_t off = 0, blen, index;
int ret = 0, i;
INIT_LIST_HEAD(&revoke_list);
while (len) {
blen = min_t(pgoff_t, ADDRS_PER_BLOCK(cow_inode), len);
set_new_dnode(&dn, cow_inode, NULL, NULL, 0);
ret = f2fs_get_dnode_of_data(&dn, off, LOOKUP_NODE_RA);
if (ret && ret != -ENOENT) {
goto out;
} else if (ret == -ENOENT) {
ret = 0;
if (dn.max_level == 0)
goto out;
goto next;
}
blen = min((pgoff_t)ADDRS_PER_PAGE(dn.node_page, cow_inode),
len);
index = off;
for (i = 0; i < blen; i++, dn.ofs_in_node++, index++) {
blkaddr = f2fs_data_blkaddr(&dn);
if (!__is_valid_data_blkaddr(blkaddr)) {
continue;
} else if (!f2fs_is_valid_blkaddr(sbi, blkaddr,
DATA_GENERIC_ENHANCE)) {
f2fs_put_dnode(&dn);
ret = -EFSCORRUPTED;
f2fs_handle_error(sbi,
ERROR_INVALID_BLKADDR);
goto out;
}
new = f2fs_kmem_cache_alloc(revoke_entry_slab, GFP_NOFS,
true, NULL);
ret = __replace_atomic_write_block(inode, index, blkaddr,
&new->old_addr, false);
if (ret) {
f2fs_put_dnode(&dn);
kmem_cache_free(revoke_entry_slab, new);
goto out;
}
f2fs_update_data_blkaddr(&dn, NULL_ADDR);
new->index = index;
list_add_tail(&new->list, &revoke_list);
}
f2fs_put_dnode(&dn);
next:
off += blen;
len -= blen;
}
out:
if (ret) {
sbi->revoked_atomic_block += fi->atomic_write_cnt;
} else {
sbi->committed_atomic_block += fi->atomic_write_cnt;
set_inode_flag(inode, FI_ATOMIC_COMMITTED);
}
__complete_revoke_list(inode, &revoke_list, ret ? true : false);
return ret;
}
int f2fs_commit_atomic_write(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct f2fs_inode_info *fi = F2FS_I(inode);
int err;
err = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
if (err)
return err;
f2fs_down_write(&fi->i_gc_rwsem[WRITE]);
f2fs_lock_op(sbi);
err = __f2fs_commit_atomic_write(inode);
f2fs_unlock_op(sbi);
f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
return err;
}
/*
* This function balances dirty node and dentry pages.
* In addition, it controls garbage collection.
*/
void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
{
if (time_to_inject(sbi, FAULT_CHECKPOINT))
f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_FAULT_INJECT);
/* balance_fs_bg is able to be pending */
if (need && excess_cached_nats(sbi))
f2fs_balance_fs_bg(sbi, false);
if (!f2fs_is_checkpoint_ready(sbi))
return;
/*
* We should do GC or end up with checkpoint, if there are so many dirty
* dir/node pages without enough free segments.
*/
if (has_enough_free_secs(sbi, 0, 0))
return;
if (test_opt(sbi, GC_MERGE) && sbi->gc_thread &&
sbi->gc_thread->f2fs_gc_task) {
DEFINE_WAIT(wait);
prepare_to_wait(&sbi->gc_thread->fggc_wq, &wait,
TASK_UNINTERRUPTIBLE);
wake_up(&sbi->gc_thread->gc_wait_queue_head);
io_schedule();
finish_wait(&sbi->gc_thread->fggc_wq, &wait);
} else {
struct f2fs_gc_control gc_control = {
.victim_segno = NULL_SEGNO,
.init_gc_type = BG_GC,
.no_bg_gc = true,
.should_migrate_blocks = false,
.err_gc_skipped = false,
.nr_free_secs = 1 };
f2fs_down_write(&sbi->gc_lock);
stat_inc_gc_call_count(sbi, FOREGROUND);
f2fs_gc(sbi, &gc_control);
}
}
static inline bool excess_dirty_threshold(struct f2fs_sb_info *sbi)
{
int factor = f2fs_rwsem_is_locked(&sbi->cp_rwsem) ? 3 : 2;
unsigned int dents = get_pages(sbi, F2FS_DIRTY_DENTS);
unsigned int qdata = get_pages(sbi, F2FS_DIRTY_QDATA);
unsigned int nodes = get_pages(sbi, F2FS_DIRTY_NODES);
unsigned int meta = get_pages(sbi, F2FS_DIRTY_META);
unsigned int imeta = get_pages(sbi, F2FS_DIRTY_IMETA);
unsigned int threshold = sbi->blocks_per_seg * factor *
DEFAULT_DIRTY_THRESHOLD;
unsigned int global_threshold = threshold * 3 / 2;
if (dents >= threshold || qdata >= threshold ||
nodes >= threshold || meta >= threshold ||
imeta >= threshold)
return true;
return dents + qdata + nodes + meta + imeta > global_threshold;
}
void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg)
{
if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
return;
/* try to shrink extent cache when there is no enough memory */
if (!f2fs_available_free_memory(sbi, READ_EXTENT_CACHE))
f2fs_shrink_read_extent_tree(sbi,
READ_EXTENT_CACHE_SHRINK_NUMBER);
/* try to shrink age extent cache when there is no enough memory */
if (!f2fs_available_free_memory(sbi, AGE_EXTENT_CACHE))
f2fs_shrink_age_extent_tree(sbi,
AGE_EXTENT_CACHE_SHRINK_NUMBER);
/* check the # of cached NAT entries */
if (!f2fs_available_free_memory(sbi, NAT_ENTRIES))
f2fs_try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK);
if (!f2fs_available_free_memory(sbi, FREE_NIDS))
f2fs_try_to_free_nids(sbi, MAX_FREE_NIDS);
else
f2fs_build_free_nids(sbi, false, false);
if (excess_dirty_nats(sbi) || excess_dirty_threshold(sbi) ||
excess_prefree_segs(sbi) || !f2fs_space_for_roll_forward(sbi))
goto do_sync;
/* there is background inflight IO or foreground operation recently */
if (is_inflight_io(sbi, REQ_TIME) ||
(!f2fs_time_over(sbi, REQ_TIME) && f2fs_rwsem_is_locked(&sbi->cp_rwsem)))
return;
/* exceed periodical checkpoint timeout threshold */
if (f2fs_time_over(sbi, CP_TIME))
goto do_sync;
/* checkpoint is the only way to shrink partial cached entries */
if (f2fs_available_free_memory(sbi, NAT_ENTRIES) &&
f2fs_available_free_memory(sbi, INO_ENTRIES))
return;
do_sync:
if (test_opt(sbi, DATA_FLUSH) && from_bg) {
struct blk_plug plug;
mutex_lock(&sbi->flush_lock);
blk_start_plug(&plug);
f2fs_sync_dirty_inodes(sbi, FILE_INODE, false);
blk_finish_plug(&plug);
mutex_unlock(&sbi->flush_lock);
}
stat_inc_cp_call_count(sbi, BACKGROUND);
f2fs_sync_fs(sbi->sb, 1);
}
static int __submit_flush_wait(struct f2fs_sb_info *sbi,
struct block_device *bdev)
{
int ret = blkdev_issue_flush(bdev);
trace_f2fs_issue_flush(bdev, test_opt(sbi, NOBARRIER),
test_opt(sbi, FLUSH_MERGE), ret);
if (!ret)
f2fs_update_iostat(sbi, NULL, FS_FLUSH_IO, 0);
return ret;
}
static int submit_flush_wait(struct f2fs_sb_info *sbi, nid_t ino)
{
int ret = 0;
int i;
if (!f2fs_is_multi_device(sbi))
return __submit_flush_wait(sbi, sbi->sb->s_bdev);
for (i = 0; i < sbi->s_ndevs; i++) {
if (!f2fs_is_dirty_device(sbi, ino, i, FLUSH_INO))
continue;
ret = __submit_flush_wait(sbi, FDEV(i).bdev);
if (ret)
break;
}
return ret;
}
static int issue_flush_thread(void *data)
{
struct f2fs_sb_info *sbi = data;
struct flush_cmd_control *fcc = SM_I(sbi)->fcc_info;
wait_queue_head_t *q = &fcc->flush_wait_queue;
repeat:
if (kthread_should_stop())
return 0;
if (!llist_empty(&fcc->issue_list)) {
struct flush_cmd *cmd, *next;
int ret;
fcc->dispatch_list = llist_del_all(&fcc->issue_list);
fcc->dispatch_list = llist_reverse_order(fcc->dispatch_list);
cmd = llist_entry(fcc->dispatch_list, struct flush_cmd, llnode);
ret = submit_flush_wait(sbi, cmd->ino);
atomic_inc(&fcc->issued_flush);
llist_for_each_entry_safe(cmd, next,
fcc->dispatch_list, llnode) {
cmd->ret = ret;
complete(&cmd->wait);
}
fcc->dispatch_list = NULL;
}
wait_event_interruptible(*q,
kthread_should_stop() || !llist_empty(&fcc->issue_list));
goto repeat;
}
int f2fs_issue_flush(struct f2fs_sb_info *sbi, nid_t ino)
{
struct flush_cmd_control *fcc = SM_I(sbi)->fcc_info;
struct flush_cmd cmd;
int ret;
if (test_opt(sbi, NOBARRIER))
return 0;
if (!test_opt(sbi, FLUSH_MERGE)) {
atomic_inc(&fcc->queued_flush);
ret = submit_flush_wait(sbi, ino);
atomic_dec(&fcc->queued_flush);
atomic_inc(&fcc->issued_flush);
return ret;
}
if (atomic_inc_return(&fcc->queued_flush) == 1 ||
f2fs_is_multi_device(sbi)) {
ret = submit_flush_wait(sbi, ino);
atomic_dec(&fcc->queued_flush);
atomic_inc(&fcc->issued_flush);
return ret;
}
cmd.ino = ino;
init_completion(&cmd.wait);
llist_add(&cmd.llnode, &fcc->issue_list);
/*
* update issue_list before we wake up issue_flush thread, this
* smp_mb() pairs with another barrier in ___wait_event(), see
* more details in comments of waitqueue_active().
*/
smp_mb();
if (waitqueue_active(&fcc->flush_wait_queue))
wake_up(&fcc->flush_wait_queue);
if (fcc->f2fs_issue_flush) {
wait_for_completion(&cmd.wait);
atomic_dec(&fcc->queued_flush);
} else {
struct llist_node *list;
list = llist_del_all(&fcc->issue_list);
if (!list) {
wait_for_completion(&cmd.wait);
atomic_dec(&fcc->queued_flush);
} else {
struct flush_cmd *tmp, *next;
ret = submit_flush_wait(sbi, ino);
llist_for_each_entry_safe(tmp, next, list, llnode) {
if (tmp == &cmd) {
cmd.ret = ret;
atomic_dec(&fcc->queued_flush);
continue;
}
tmp->ret = ret;
complete(&tmp->wait);
}
}
}
return cmd.ret;
}
int f2fs_create_flush_cmd_control(struct f2fs_sb_info *sbi)
{
dev_t dev = sbi->sb->s_bdev->bd_dev;
struct flush_cmd_control *fcc;
if (SM_I(sbi)->fcc_info) {
fcc = SM_I(sbi)->fcc_info;
if (fcc->f2fs_issue_flush)
return 0;
goto init_thread;
}
fcc = f2fs_kzalloc(sbi, sizeof(struct flush_cmd_control), GFP_KERNEL);
if (!fcc)
return -ENOMEM;
atomic_set(&fcc->issued_flush, 0);
atomic_set(&fcc->queued_flush, 0);
init_waitqueue_head(&fcc->flush_wait_queue);
init_llist_head(&fcc->issue_list);
SM_I(sbi)->fcc_info = fcc;
if (!test_opt(sbi, FLUSH_MERGE))
return 0;
init_thread:
fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
"f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
if (IS_ERR(fcc->f2fs_issue_flush)) {
int err = PTR_ERR(fcc->f2fs_issue_flush);
fcc->f2fs_issue_flush = NULL;
return err;
}
return 0;
}
void f2fs_destroy_flush_cmd_control(struct f2fs_sb_info *sbi, bool free)
{
struct flush_cmd_control *fcc = SM_I(sbi)->fcc_info;
if (fcc && fcc->f2fs_issue_flush) {
struct task_struct *flush_thread = fcc->f2fs_issue_flush;
fcc->f2fs_issue_flush = NULL;
kthread_stop(flush_thread);
}
if (free) {
kfree(fcc);
SM_I(sbi)->fcc_info = NULL;
}
}
int f2fs_flush_device_cache(struct f2fs_sb_info *sbi)
{
int ret = 0, i;
if (!f2fs_is_multi_device(sbi))
return 0;
if (test_opt(sbi, NOBARRIER))
return 0;
for (i = 1; i < sbi->s_ndevs; i++) {
int count = DEFAULT_RETRY_IO_COUNT;
if (!f2fs_test_bit(i, (char *)&sbi->dirty_device))
continue;
do {
ret = __submit_flush_wait(sbi, FDEV(i).bdev);
if (ret)
f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
} while (ret && --count);
if (ret) {
f2fs_stop_checkpoint(sbi, false,
STOP_CP_REASON_FLUSH_FAIL);
break;
}
spin_lock(&sbi->dev_lock);
f2fs_clear_bit(i, (char *)&sbi->dirty_device);
spin_unlock(&sbi->dev_lock);
}
return ret;
}
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 = sentry->type;
if (unlikely(t >= DIRTY)) {
f2fs_bug_on(sbi, 1);
return;
}
if (!test_and_set_bit(segno, dirty_i->dirty_segmap[t]))
dirty_i->nr_dirty[t]++;
if (__is_large_section(sbi)) {
unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
block_t valid_blocks =
get_valid_blocks(sbi, segno, true);
f2fs_bug_on(sbi, unlikely(!valid_blocks ||
valid_blocks == CAP_BLKS_PER_SEC(sbi)));
if (!IS_CURSEC(sbi, secno))
set_bit(secno, dirty_i->dirty_secmap);
}
}
}
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);
block_t valid_blocks;
if (test_and_clear_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 = sentry->type;
if (test_and_clear_bit(segno, dirty_i->dirty_segmap[t]))
dirty_i->nr_dirty[t]--;
valid_blocks = get_valid_blocks(sbi, segno, true);
if (valid_blocks == 0) {
clear_bit(GET_SEC_FROM_SEG(sbi, segno),
dirty_i->victim_secmap);
#ifdef CONFIG_F2FS_CHECK_FS
clear_bit(segno, SIT_I(sbi)->invalid_segmap);
#endif
}
if (__is_large_section(sbi)) {
unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
if (!valid_blocks ||
valid_blocks == CAP_BLKS_PER_SEC(sbi)) {
clear_bit(secno, dirty_i->dirty_secmap);
return;
}
if (!IS_CURSEC(sbi, secno))
set_bit(secno, dirty_i->dirty_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, ckpt_valid_blocks;
unsigned int usable_blocks;
if (segno == NULL_SEGNO || IS_CURSEG(sbi, segno))
return;
usable_blocks = f2fs_usable_blks_in_seg(sbi, segno);
mutex_lock(&dirty_i->seglist_lock);
valid_blocks = get_valid_blocks(sbi, segno, false);
ckpt_valid_blocks = get_ckpt_valid_blocks(sbi, segno, false);
if (valid_blocks == 0 && (!is_sbi_flag_set(sbi, SBI_CP_DISABLED) ||
ckpt_valid_blocks == usable_blocks)) {
__locate_dirty_segment(sbi, segno, PRE);
__remove_dirty_segment(sbi, segno, DIRTY);
} else if (valid_blocks < usable_blocks) {
__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);
}
/* This moves currently empty dirty blocks to prefree. Must hold seglist_lock */
void f2fs_dirty_to_prefree(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
unsigned int segno;
mutex_lock(&dirty_i->seglist_lock);
for_each_set_bit(segno, dirty_i->dirty_segmap[DIRTY], MAIN_SEGS(sbi)) {
if (get_valid_blocks(sbi, segno, false))
continue;
if (IS_CURSEG(sbi, segno))
continue;
__locate_dirty_segment(sbi, segno, PRE);
__remove_dirty_segment(sbi, segno, DIRTY);
}
mutex_unlock(&dirty_i->seglist_lock);
}
block_t f2fs_get_unusable_blocks(struct f2fs_sb_info *sbi)
{
int ovp_hole_segs =
(overprovision_segments(sbi) - reserved_segments(sbi));
block_t ovp_holes = ovp_hole_segs << sbi->log_blocks_per_seg;
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
block_t holes[2] = {0, 0}; /* DATA and NODE */
block_t unusable;
struct seg_entry *se;
unsigned int segno;
mutex_lock(&dirty_i->seglist_lock);
for_each_set_bit(segno, dirty_i->dirty_segmap[DIRTY], MAIN_SEGS(sbi)) {
se = get_seg_entry(sbi, segno);
if (IS_NODESEG(se->type))
holes[NODE] += f2fs_usable_blks_in_seg(sbi, segno) -
se->valid_blocks;
else
holes[DATA] += f2fs_usable_blks_in_seg(sbi, segno) -
se->valid_blocks;
}
mutex_unlock(&dirty_i->seglist_lock);
unusable = max(holes[DATA], holes[NODE]);
if (unusable > ovp_holes)
return unusable - ovp_holes;
return 0;
}
int f2fs_disable_cp_again(struct f2fs_sb_info *sbi, block_t unusable)
{
int ovp_hole_segs =
(overprovision_segments(sbi) - reserved_segments(sbi));
if (unusable > F2FS_OPTION(sbi).unusable_cap)
return -EAGAIN;
if (is_sbi_flag_set(sbi, SBI_CP_DISABLED_QUICK) &&
dirty_segments(sbi) > ovp_hole_segs)
return -EAGAIN;
return 0;
}
/* This is only used by SBI_CP_DISABLED */
static unsigned int get_free_segment(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
unsigned int segno = 0;
mutex_lock(&dirty_i->seglist_lock);
for_each_set_bit(segno, dirty_i->dirty_segmap[DIRTY], MAIN_SEGS(sbi)) {
if (get_valid_blocks(sbi, segno, false))
continue;
if (get_ckpt_valid_blocks(sbi, segno, false))
continue;
mutex_unlock(&dirty_i->seglist_lock);
return segno;
}
mutex_unlock(&dirty_i->seglist_lock);
return NULL_SEGNO;
}
static struct discard_cmd *__create_discard_cmd(struct f2fs_sb_info *sbi,
struct block_device *bdev, block_t lstart,
block_t start, block_t len)
{
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
struct list_head *pend_list;
struct discard_cmd *dc;
f2fs_bug_on(sbi, !len);
pend_list = &dcc->pend_list[plist_idx(len)];
dc = f2fs_kmem_cache_alloc(discard_cmd_slab, GFP_NOFS, true, NULL);
INIT_LIST_HEAD(&dc->list);
dc->bdev = bdev;
dc->di.lstart = lstart;
dc->di.start = start;
dc->di.len = len;
dc->ref = 0;
dc->state = D_PREP;
dc->queued = 0;
dc->error = 0;
init_completion(&dc->wait);
list_add_tail(&dc->list, pend_list);
spin_lock_init(&dc->lock);
dc->bio_ref = 0;
atomic_inc(&dcc->discard_cmd_cnt);
dcc->undiscard_blks += len;
return dc;
}
static bool f2fs_check_discard_tree(struct f2fs_sb_info *sbi)
{
#ifdef CONFIG_F2FS_CHECK_FS
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
struct rb_node *cur = rb_first_cached(&dcc->root), *next;
struct discard_cmd *cur_dc, *next_dc;
while (cur) {
next = rb_next(cur);
if (!next)
return true;
cur_dc = rb_entry(cur, struct discard_cmd, rb_node);
next_dc = rb_entry(next, struct discard_cmd, rb_node);
if (cur_dc->di.lstart + cur_dc->di.len > next_dc->di.lstart) {
f2fs_info(sbi, "broken discard_rbtree, "
"cur(%u, %u) next(%u, %u)",
cur_dc->di.lstart, cur_dc->di.len,
next_dc->di.lstart, next_dc->di.len);
return false;
}
cur = next;
}
#endif
return true;
}
static struct discard_cmd *__lookup_discard_cmd(struct f2fs_sb_info *sbi,
block_t blkaddr)
{
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
struct rb_node *node = dcc->root.rb_root.rb_node;
struct discard_cmd *dc;
while (node) {
dc = rb_entry(node, struct discard_cmd, rb_node);