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

On 07/27, Yunlong Song wrote:
> v1->v2, fix some dead lock problems under some heavy load test

So, does this patch resolve the previous GC problem?

Thanks,

>
> 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.
> >
> > 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;
>
> --
> Thanks,
> Yunlong Song
>

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