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SubjectRe: [PATCH v2] f2fs: provide f2fs_balance_fs to __write_node_page
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Hi Yunlong,

On 2017/7/27 20:13, Yunlong Song wrote:
> v1->v2, fix some dead lock problems under some heavy load test
>
> On 2017/7/27 20:11, Yunlong Song wrote:
>> Let node writeback also do f2fs_balance_fs to ensure there are always enough free
>> segments.

Could we cover __write_data_page of directory inode with this logic?

Thanks,

>>
>> Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
>> ---
>> fs/f2fs/checkpoint.c | 2 +-
>> fs/f2fs/f2fs.h | 2 +-
>> fs/f2fs/node.c | 14 ++++++++------
>> 3 files changed, 10 insertions(+), 8 deletions(-)
>>
>> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
>> index 5b876f6..3c84a25 100644
>> --- a/fs/f2fs/checkpoint.c
>> +++ b/fs/f2fs/checkpoint.c
>> @@ -1017,7 +1017,7 @@ static int block_operations(struct f2fs_sb_info *sbi)
>>
>> if (get_pages(sbi, F2FS_DIRTY_NODES)) {
>> up_write(&sbi->node_write);
>> - err = sync_node_pages(sbi, &wbc);
>> + err = sync_node_pages(sbi, &wbc, false);
>> if (err) {
>> up_write(&sbi->node_change);
>> f2fs_unlock_all(sbi);
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index 94a88b2..f69051b 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -2293,7 +2293,7 @@ struct page *new_node_page(struct dnode_of_data *dn,
>> void move_node_page(struct page *node_page, int gc_type);
>> int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
>> struct writeback_control *wbc, bool atomic);
>> -int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc);
>> +int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc, bool need);
>> void build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount);
>> bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid);
>> void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid);
>> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
>> index d53fe62..210ec25 100644
>> --- a/fs/f2fs/node.c
>> +++ b/fs/f2fs/node.c
>> @@ -1326,7 +1326,7 @@ 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)
>> + struct writeback_control *wbc, bool need)
>> {
>> struct f2fs_sb_info *sbi = F2FS_P_SB(page);
>> nid_t nid;
>> @@ -1387,6 +1387,8 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
>> }
>>
>> unlock_page(page);
>> + if (need)
>> + f2fs_balance_fs(sbi, false);
>>
>> if (unlikely(f2fs_cp_error(sbi))) {
>> f2fs_submit_merged_write(sbi, NODE);
>> @@ -1405,7 +1407,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
>> static int f2fs_write_node_page(struct page *page,
>> struct writeback_control *wbc)
>> {
>> - return __write_node_page(page, false, NULL, wbc);
>> + return __write_node_page(page, false, NULL, wbc, false);
>> }
>>
>> int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
>> @@ -1493,7 +1495,7 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
>>
>> ret = __write_node_page(page, atomic &&
>> page == last_page,
>> - &submitted, wbc);
>> + &submitted, wbc, true);
>> if (ret) {
>> unlock_page(page);
>> f2fs_put_page(last_page, 0);
>> @@ -1530,7 +1532,7 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
>> return ret ? -EIO: 0;
>> }
>>
>> -int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc)
>> +int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc, bool need)
>> {
>> pgoff_t index, end;
>> struct pagevec pvec;
>> @@ -1608,7 +1610,7 @@ int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc)
>> set_fsync_mark(page, 0);
>> set_dentry_mark(page, 0);
>>
>> - ret = __write_node_page(page, false, &submitted, wbc);
>> + ret = __write_node_page(page, false, &submitted, wbc, need);
>> if (ret)
>> unlock_page(page);
>> else if (submitted)
>> @@ -1697,7 +1699,7 @@ static int f2fs_write_node_pages(struct address_space *mapping,
>> diff = nr_pages_to_write(sbi, NODE, wbc);
>> wbc->sync_mode = WB_SYNC_NONE;
>> blk_start_plug(&plug);
>> - sync_node_pages(sbi, wbc);
>> + sync_node_pages(sbi, wbc, true);
>> blk_finish_plug(&plug);
>> wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
>> return 0;
>

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