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SubjectRe: [PATCH v3 1/2] f2fs: fix to avoid broken of dnode block list
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On 2018/7/23 20:25, Jaegeuk Kim wrote:
> On 07/20, Chao Yu wrote:
>> Hi Jaegeuk,
>>
>> On 2018/7/15 9:30, Chao Yu wrote:
>>> On 2018/7/14 13:44, Jaegeuk Kim wrote:
>>>> On 07/08, Chao Yu wrote:
>>>>> From: Chao Yu <yuchao0@huawei.com>
>>>>>
>>>>> f2fs recovery flow is relying on dnode block link list, it means fsynced
>>>>> file recovery depends on previous dnode's persistence in the list, so
>>>>> during fsync() we should wait on all regular inode's dnode writebacked
>>>>> before issuing flush.
>>>>>
>>>>> By this way, we can avoid dnode block list being broken by out-of-order
>>>>> IO submission due to IO scheduler or driver.
>>>>
>>>> Hi Chao,
>>>>
>>>> Just in case, can we measure some performance numbers with this?
>>>
>>> Hi Jaegeuk,
>>>
>>> OK, let me do some tests on this.
>>
>> Sheng Yong helps to do the test with this patch:
>>
>> # Microbenchmark
>> Target:/data (f2fs, -)
>> 64MB / 32768KB / 4KB / 8
>>
>> # SQLite benchmark
>> 1 / PERSIST / Index
>>
>> Base:
>> SEQ-RD(MB/s) SEQ-WR(MB/s) RND-RD(IOPS) RND-WR(IOPS) Insert(TPS) Update(TPS) Delete(TPS)
>> 1 867.82 204.15 41440.03 41370.54 680.8 1025.94 1031.08
>> 2 871.87 205.87 41370.3 40275.2 791.14 1065.84 1101.7
>> 3 866.52 205.69 41795.67 40596.16 694.69 1037.16 1031.48
>> Avg 868.7366667 205.2366667 41535.33333 40747.3 722.21 1042.98 1054.753333
>>
>> After:
>> SEQ-RD(MB/s) SEQ-WR(MB/s) RND-RD(IOPS) RND-WR(IOPS) Insert(TPS) Update(TPS) Delete(TPS)
>> 1 798.81 202.5 41143 40613.87 602.71 838.08 913.83
>> 2 805.79 206.47 40297.2 41291.46 604.44 840.75 924.27
>> 3 814.83 206.17 41209.57 40453.62 602.85 834.66 927.91
>> Avg 806.4766667 205.0466667 40883.25667 40786.31667 603.3333333 837.83 922.0033333
>>
>> Orig/Patched:
>> 0.928332713 0.999074239 0.984300676 1.000957528 0.835398753 0.803303994 0.874141189
>>
>> It looks like atomic write will suffer performance regression.
>>
>> I suspect that the criminal is that we forcing to wait all dnode being in
>> storage cache before we issue PREFLUSH+FUA.
>>
>> BTW, will commit ("f2fs: don't need to wait for node writes for atomic write")
>> cause the problem: we will lose data of last transaction after SPO, even if
>> atomic write return no error:
>
> Practically, I don't see db corruption becase of this. We can excuse to lose
> the last transaction.

So, let me add these numbers in log of the patch, and change to skip waiting
node page for atomic write.

Thanks,

>
> Thanks,
>
>>
>> - atomic_open();
>> - write() P1, P2, P3;
>> - atomic_commit();
>> - writeback data: P1, P2, P3;
>> - writeback node: N1, N2, N3; <--- If N1, N2 is not writebacked, N3 with fsync_mark is
>> writebacked, In SPOR, we won't find N3 since node chain is broken, turns out that losing
>> last transaction.
>> - preflush + fua;
>> - power-cut
>>
>> Thanks,
>>
>>>
>>> Thanks,
>>>
>>>>
>>>> Thanks,
>>>>
>>>>>
>>>>> Signed-off-by: Chao Yu <yuchao0@huawei.com>
>>>>> ---
>>>>> v3:
>>>>> - add a list to link all writebacked dnodes, let fsync() only wait on
>>>>> necessary dnode.
>>>>> fs/f2fs/checkpoint.c | 2 +
>>>>> fs/f2fs/data.c | 2 +
>>>>> fs/f2fs/f2fs.h | 21 +++++++-
>>>>> fs/f2fs/file.c | 20 +++----
>>>>> fs/f2fs/node.c | 148 +++++++++++++++++++++++++++++++++++++++++----------
>>>>> fs/f2fs/super.c | 4 ++
>>>>> 6 files changed, 153 insertions(+), 44 deletions(-)
>>>>>
>>>>> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
>>>>> index 8b698bd54490..d5e60d76362e 100644
>>>>> --- a/fs/f2fs/checkpoint.c
>>>>> +++ b/fs/f2fs/checkpoint.c
>>>>> @@ -1379,6 +1379,8 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
>>>>>
>>>>> f2fs_release_ino_entry(sbi, false);
>>>>>
>>>>> + f2fs_reset_fsync_node_info(sbi);
>>>>> +
>>>>> if (unlikely(f2fs_cp_error(sbi)))
>>>>> return -EIO;
>>>>>
>>>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>>>>> index 70813a4dda3e..afe76d87575c 100644
>>>>> --- a/fs/f2fs/data.c
>>>>> +++ b/fs/f2fs/data.c
>>>>> @@ -176,6 +176,8 @@ static void f2fs_write_end_io(struct bio *bio)
>>>>> page->index != nid_of_node(page));
>>>>>
>>>>> dec_page_count(sbi, WB_DATA_TYPE(page));
>>>>> + if (f2fs_in_warm_node_list(sbi, page))
>>>>> + f2fs_del_fsync_node_entry(sbi, page);
>>>>> clear_cold_data(page);
>>>>> end_page_writeback(page);
>>>>> }
>>>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>>>> index c8c865fa8450..bf5f7a336ace 100644
>>>>> --- a/fs/f2fs/f2fs.h
>>>>> +++ b/fs/f2fs/f2fs.h
>>>>> @@ -228,6 +228,12 @@ struct inode_entry {
>>>>> struct inode *inode; /* vfs inode pointer */
>>>>> };
>>>>>
>>>>> +struct fsync_node_entry {
>>>>> + struct list_head list; /* list head */
>>>>> + struct page *page; /* warm node page pointer */
>>>>> + unsigned int seq_id; /* sequence id */
>>>>> +};
>>>>> +
>>>>> /* for the bitmap indicate blocks to be discarded */
>>>>> struct discard_entry {
>>>>> struct list_head list; /* list head */
>>>>> @@ -1152,6 +1158,11 @@ struct f2fs_sb_info {
>>>>>
>>>>> struct inode_management im[MAX_INO_ENTRY]; /* manage inode cache */
>>>>>
>>>>> + spinlock_t fsync_node_lock; /* for node entry lock */
>>>>> + struct list_head fsync_node_list; /* node list head */
>>>>> + unsigned int fsync_seg_id; /* sequence id */
>>>>> + unsigned int fsync_node_num; /* number of node entries */
>>>>> +
>>>>> /* for orphan inode, use 0'th array */
>>>>> unsigned int max_orphans; /* max orphan inodes */
>>>>>
>>>>> @@ -2816,6 +2827,10 @@ struct node_info;
>>>>>
>>>>> int f2fs_check_nid_range(struct f2fs_sb_info *sbi, nid_t nid);
>>>>> bool f2fs_available_free_memory(struct f2fs_sb_info *sbi, int type);
>>>>> +bool f2fs_in_warm_node_list(struct f2fs_sb_info *sbi, struct page *page);
>>>>> +void f2fs_init_fsync_node_info(struct f2fs_sb_info *sbi);
>>>>> +void f2fs_del_fsync_node_entry(struct f2fs_sb_info *sbi, struct page *page);
>>>>> +void f2fs_reset_fsync_node_info(struct f2fs_sb_info *sbi);
>>>>> int f2fs_need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid);
>>>>> bool f2fs_is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid);
>>>>> bool f2fs_need_inode_block_update(struct f2fs_sb_info *sbi, nid_t ino);
>>>>> @@ -2825,7 +2840,8 @@ pgoff_t f2fs_get_next_page_offset(struct dnode_of_data *dn, pgoff_t pgofs);
>>>>> int f2fs_get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode);
>>>>> int f2fs_truncate_inode_blocks(struct inode *inode, pgoff_t from);
>>>>> int f2fs_truncate_xattr_node(struct inode *inode);
>>>>> -int f2fs_wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino);
>>>>> +int f2fs_wait_on_node_pages_writeback(struct f2fs_sb_info *sbi,
>>>>> + unsigned int seq_id);
>>>>> int f2fs_remove_inode_page(struct inode *inode);
>>>>> struct page *f2fs_new_inode_page(struct inode *inode);
>>>>> struct page *f2fs_new_node_page(struct dnode_of_data *dn, unsigned int ofs);
>>>>> @@ -2834,7 +2850,8 @@ struct page *f2fs_get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid);
>>>>> struct page *f2fs_get_node_page_ra(struct page *parent, int start);
>>>>> void f2fs_move_node_page(struct page *node_page, int gc_type);
>>>>> int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
>>>>> - struct writeback_control *wbc, bool atomic);
>>>>> + struct writeback_control *wbc, bool atomic,
>>>>> + unsigned int *seq_id);
>>>>> int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
>>>>> struct writeback_control *wbc,
>>>>> bool do_balance, enum iostat_type io_type);
>>>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>>>>> index 5e29d4053748..ddea2bfd4042 100644
>>>>> --- a/fs/f2fs/file.c
>>>>> +++ b/fs/f2fs/file.c
>>>>> @@ -213,6 +213,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
>>>>> .nr_to_write = LONG_MAX,
>>>>> .for_reclaim = 0,
>>>>> };
>>>>> + unsigned int seq_id = 0;
>>>>>
>>>>> if (unlikely(f2fs_readonly(inode->i_sb)))
>>>>> return 0;
>>>>> @@ -275,7 +276,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
>>>>> }
>>>>> sync_nodes:
>>>>> atomic_inc(&sbi->wb_sync_req[NODE]);
>>>>> - ret = f2fs_fsync_node_pages(sbi, inode, &wbc, atomic);
>>>>> + ret = f2fs_fsync_node_pages(sbi, inode, &wbc, atomic, &seq_id);
>>>>> atomic_dec(&sbi->wb_sync_req[NODE]);
>>>>> if (ret)
>>>>> goto out;
>>>>> @@ -292,19 +293,10 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
>>>>> goto sync_nodes;
>>>>> }
>>>>>
>>>>> - /*
>>>>> - * If it's atomic_write, it's just fine to keep write ordering. So
>>>>> - * here we don't need to wait for node write completion, since we use
>>>>> - * node chain which serializes node blocks. If one of node writes are
>>>>> - * reordered, we can see simply broken chain, resulting in stopping
>>>>> - * roll-forward recovery. It means we'll recover all or none node blocks
>>>>> - * given fsync mark.
>>>>> - */
>>>>> - if (!atomic) {
>>>>> - ret = f2fs_wait_on_node_pages_writeback(sbi, ino);
>>>>> - if (ret)
>>>>> - goto out;
>>>>> - }
>>>>> +
>>>>> + ret = f2fs_wait_on_node_pages_writeback(sbi, seq_id);
>>>>> + if (ret)
>>>>> + goto out;
>>>>>
>>>>> /* once recovery info is written, don't need to tack this */
>>>>> f2fs_remove_ino_entry(sbi, ino, APPEND_INO);
>>>>> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
>>>>> index 1e30bc305243..31dc372c56a0 100644
>>>>> --- a/fs/f2fs/node.c
>>>>> +++ b/fs/f2fs/node.c
>>>>> @@ -28,6 +28,7 @@
>>>>> static struct kmem_cache *nat_entry_slab;
>>>>> static struct kmem_cache *free_nid_slab;
>>>>> static struct kmem_cache *nat_entry_set_slab;
>>>>> +static struct kmem_cache *fsync_node_entry_slab;
>>>>>
>>>>> /*
>>>>> * Check whether the given nid is within node id range.
>>>>> @@ -267,6 +268,72 @@ static unsigned int __gang_lookup_nat_set(struct f2fs_nm_info *nm_i,
>>>>> start, nr);
>>>>> }
>>>>>
>>>>> +bool f2fs_in_warm_node_list(struct f2fs_sb_info *sbi, struct page *page)
>>>>> +{
>>>>> + return NODE_MAPPING(sbi) == page->mapping &&
>>>>> + IS_DNODE(page) && is_cold_node(page);
>>>>> +}
>>>>> +
>>>>> +void f2fs_init_fsync_node_info(struct f2fs_sb_info *sbi)
>>>>> +{
>>>>> + spin_lock_init(&sbi->fsync_node_lock);
>>>>> + INIT_LIST_HEAD(&sbi->fsync_node_list);
>>>>> + sbi->fsync_seg_id = 0;
>>>>> + sbi->fsync_node_num = 0;
>>>>> +}
>>>>> +
>>>>> +static unsigned int f2fs_add_fsync_node_entry(struct f2fs_sb_info *sbi,
>>>>> + struct page *page)
>>>>> +{
>>>>> + struct fsync_node_entry *fn;
>>>>> + unsigned long flags;
>>>>> + unsigned int seq_id;
>>>>> +
>>>>> + fn = f2fs_kmem_cache_alloc(fsync_node_entry_slab, GFP_NOFS);
>>>>> +
>>>>> + get_page(page);
>>>>> + fn->page = page;
>>>>> + INIT_LIST_HEAD(&fn->list);
>>>>> +
>>>>> + spin_lock_irqsave(&sbi->fsync_node_lock, flags);
>>>>> + list_add_tail(&fn->list, &sbi->fsync_node_list);
>>>>> + fn->seq_id = sbi->fsync_seg_id++;
>>>>> + seq_id = fn->seq_id;
>>>>> + sbi->fsync_node_num++;
>>>>> + spin_unlock_irqrestore(&sbi->fsync_node_lock, flags);
>>>>> +
>>>>> + return seq_id;
>>>>> +}
>>>>> +
>>>>> +void f2fs_del_fsync_node_entry(struct f2fs_sb_info *sbi, struct page *page)
>>>>> +{
>>>>> + struct fsync_node_entry *fn;
>>>>> + unsigned long flags;
>>>>> +
>>>>> + spin_lock_irqsave(&sbi->fsync_node_lock, flags);
>>>>> + list_for_each_entry(fn, &sbi->fsync_node_list, list) {
>>>>> + if (fn->page == page) {
>>>>> + list_del(&fn->list);
>>>>> + sbi->fsync_node_num--;
>>>>> + spin_unlock_irqrestore(&sbi->fsync_node_lock, flags);
>>>>> + kmem_cache_free(fsync_node_entry_slab, fn);
>>>>> + put_page(page);
>>>>> + return;
>>>>> + }
>>>>> + }
>>>>> + spin_unlock_irqrestore(&sbi->fsync_node_lock, flags);
>>>>> + f2fs_bug_on(sbi, 1);
>>>>> +}
>>>>> +
>>>>> +void f2fs_reset_fsync_node_info(struct f2fs_sb_info *sbi)
>>>>> +{
>>>>> + unsigned long flags;
>>>>> +
>>>>> + spin_lock_irqsave(&sbi->fsync_node_lock, flags);
>>>>> + sbi->fsync_node_num = 0;
>>>>> + spin_unlock_irqrestore(&sbi->fsync_node_lock, flags);
>>>>> +}
>>>>> +
>>>>> int f2fs_need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid)
>>>>> {
>>>>> struct f2fs_nm_info *nm_i = NM_I(sbi);
>>>>> @@ -1353,7 +1420,7 @@ static struct page *last_fsync_dnode(struct f2fs_sb_info *sbi, nid_t ino)
>>>>>
>>>>> static int __write_node_page(struct page *page, bool atomic, bool *submitted,
>>>>> struct writeback_control *wbc, bool do_balance,
>>>>> - enum iostat_type io_type)
>>>>> + enum iostat_type io_type, unsigned int *seq_id)
>>>>> {
>>>>> struct f2fs_sb_info *sbi = F2FS_P_SB(page);
>>>>> nid_t nid;
>>>>> @@ -1370,6 +1437,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
>>>>> .io_type = io_type,
>>>>> .io_wbc = wbc,
>>>>> };
>>>>> + unsigned int seq;
>>>>>
>>>>> trace_f2fs_writepage(page, NODE);
>>>>>
>>>>> @@ -1416,6 +1484,13 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
>>>>>
>>>>> set_page_writeback(page);
>>>>> ClearPageError(page);
>>>>> +
>>>>> + if (f2fs_in_warm_node_list(sbi, page)) {
>>>>> + seq = f2fs_add_fsync_node_entry(sbi, page);
>>>>> + if (seq_id)
>>>>> + *seq_id = seq;
>>>>> + }
>>>>> +
>>>>> fio.old_blkaddr = ni.blk_addr;
>>>>> f2fs_do_write_node_page(nid, &fio);
>>>>> set_node_addr(sbi, &ni, fio.new_blkaddr, is_fsync_dnode(page));
>>>>> @@ -1463,7 +1538,7 @@ void f2fs_move_node_page(struct page *node_page, int gc_type)
>>>>> goto out_page;
>>>>>
>>>>> if (__write_node_page(node_page, false, NULL,
>>>>> - &wbc, false, FS_GC_NODE_IO))
>>>>> + &wbc, false, FS_GC_NODE_IO, NULL))
>>>>> unlock_page(node_page);
>>>>> goto release_page;
>>>>> } else {
>>>>> @@ -1480,11 +1555,13 @@ void f2fs_move_node_page(struct page *node_page, int gc_type)
>>>>> static int f2fs_write_node_page(struct page *page,
>>>>> struct writeback_control *wbc)
>>>>> {
>>>>> - return __write_node_page(page, false, NULL, wbc, false, FS_NODE_IO);
>>>>> + return __write_node_page(page, false, NULL, wbc, false,
>>>>> + FS_NODE_IO, NULL);
>>>>> }
>>>>>
>>>>> int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
>>>>> - struct writeback_control *wbc, bool atomic)
>>>>> + struct writeback_control *wbc, bool atomic,
>>>>> + unsigned int *seq_id)
>>>>> {
>>>>> pgoff_t index;
>>>>> pgoff_t last_idx = ULONG_MAX;
>>>>> @@ -1565,7 +1642,7 @@ int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
>>>>> ret = __write_node_page(page, atomic &&
>>>>> page == last_page,
>>>>> &submitted, wbc, true,
>>>>> - FS_NODE_IO);
>>>>> + FS_NODE_IO, seq_id);
>>>>> if (ret) {
>>>>> unlock_page(page);
>>>>> f2fs_put_page(last_page, 0);
>>>>> @@ -1682,7 +1759,7 @@ int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
>>>>> set_dentry_mark(page, 0);
>>>>>
>>>>> ret = __write_node_page(page, false, &submitted,
>>>>> - wbc, do_balance, io_type);
>>>>> + wbc, do_balance, io_type, NULL);
>>>>> if (ret)
>>>>> unlock_page(page);
>>>>> else if (submitted)
>>>>> @@ -1713,35 +1790,42 @@ int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
>>>>> return ret;
>>>>> }
>>>>>
>>>>> -int f2fs_wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
>>>>> +int f2fs_wait_on_node_pages_writeback(struct f2fs_sb_info *sbi,
>>>>> + unsigned int seq_id)
>>>>> {
>>>>> - pgoff_t index = 0;
>>>>> - struct pagevec pvec;
>>>>> - int ret2, ret = 0;
>>>>> - int nr_pages;
>>>>> + struct fsync_node_entry *fn;
>>>>> + struct page *page;
>>>>> + struct list_head *head = &sbi->fsync_node_list;
>>>>> + unsigned long flags;
>>>>> + unsigned int cur_seq_id = 0;
>>>>> + int ret = 0;
>>>>>
>>>>> - pagevec_init(&pvec);
>>>>> + while (seq_id && cur_seq_id < seq_id) {
>>>>> + spin_lock_irqsave(&sbi->fsync_node_lock, flags);
>>>>> + if (list_empty(head)) {
>>>>> + spin_unlock_irqrestore(&sbi->fsync_node_lock, flags);
>>>>> + break;
>>>>> + }
>>>>> + fn = list_first_entry(head, struct fsync_node_entry, list);
>>>>> + if (fn->seq_id > seq_id) {
>>>>> + spin_unlock_irqrestore(&sbi->fsync_node_lock, flags);
>>>>> + break;
>>>>> + }
>>>>> + cur_seq_id = fn->seq_id;
>>>>> + page = fn->page;
>>>>> + get_page(page);
>>>>> + spin_unlock_irqrestore(&sbi->fsync_node_lock, flags);
>>>>>
>>>>> - while ((nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
>>>>> - PAGECACHE_TAG_WRITEBACK))) {
>>>>> - int i;
>>>>> + f2fs_wait_on_page_writeback(page, NODE, true);
>>>>> + if (TestClearPageError(page))
>>>>> + ret = -EIO;
>>>>>
>>>>> - for (i = 0; i < nr_pages; i++) {
>>>>> - struct page *page = pvec.pages[i];
>>>>> + put_page(page);
>>>>>
>>>>> - if (ino && ino_of_node(page) == ino) {
>>>>> - f2fs_wait_on_page_writeback(page, NODE, true);
>>>>> - if (TestClearPageError(page))
>>>>> - ret = -EIO;
>>>>> - }
>>>>> - }
>>>>> - pagevec_release(&pvec);
>>>>> - cond_resched();
>>>>> + if (ret)
>>>>> + break;
>>>>> }
>>>>>
>>>>> - ret2 = filemap_check_errors(NODE_MAPPING(sbi));
>>>>> - if (!ret)
>>>>> - ret = ret2;
>>>>> return ret;
>>>>> }
>>>>>
>>>>> @@ -2939,8 +3023,15 @@ int __init f2fs_create_node_manager_caches(void)
>>>>> sizeof(struct nat_entry_set));
>>>>> if (!nat_entry_set_slab)
>>>>> goto destroy_free_nid;
>>>>> +
>>>>> + fsync_node_entry_slab = f2fs_kmem_cache_create("fsync_node_entry",
>>>>> + sizeof(struct fsync_node_entry));
>>>>> + if (!fsync_node_entry_slab)
>>>>> + goto destroy_nat_entry_set;
>>>>> return 0;
>>>>>
>>>>> +destroy_nat_entry_set:
>>>>> + kmem_cache_destroy(nat_entry_set_slab);
>>>>> destroy_free_nid:
>>>>> kmem_cache_destroy(free_nid_slab);
>>>>> destroy_nat_entry:
>>>>> @@ -2951,6 +3042,7 @@ int __init f2fs_create_node_manager_caches(void)
>>>>>
>>>>> void f2fs_destroy_node_manager_caches(void)
>>>>> {
>>>>> + kmem_cache_destroy(fsync_node_entry_slab);
>>>>> kmem_cache_destroy(nat_entry_set_slab);
>>>>> kmem_cache_destroy(free_nid_slab);
>>>>> kmem_cache_destroy(nat_entry_slab);
>>>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>>>> index 143ed321076e..34321932754d 100644
>>>>> --- a/fs/f2fs/super.c
>>>>> +++ b/fs/f2fs/super.c
>>>>> @@ -1023,6 +1023,8 @@ static void f2fs_put_super(struct super_block *sb)
>>>>> */
>>>>> f2fs_release_ino_entry(sbi, true);
>>>>>
>>>>> + f2fs_bug_on(sbi, sbi->fsync_node_num);
>>>>> +
>>>>> f2fs_leave_shrinker(sbi);
>>>>> mutex_unlock(&sbi->umount_mutex);
>>>>>
>>>>> @@ -2903,6 +2905,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>>>>>
>>>>> f2fs_init_ino_entry_info(sbi);
>>>>>
>>>>> + f2fs_init_fsync_node_info(sbi);
>>>>> +
>>>>> /* setup f2fs internal modules */
>>>>> err = f2fs_build_segment_manager(sbi);
>>>>> if (err) {
>>>>> --
>>>>> 2.16.2.17.g38e79b1fd
>>>
>>> .
>>>

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