Jaegeuk,
Let's consider this patch in next Linux version.
BTW, do you still encounter consistency problem w/o this version?
On 2020/6/8 20:01, Chao Yu wrote:
> 71.07% 0.01% kworker/u256:1+ [kernel.kallsyms] [k] wb_writeback
> |
> --71.06%--wb_writeback
> |
> |--68.96%--__writeback_inodes_wb
> | |
> | --68.95%--writeback_sb_inodes
> | |
> |
> |--65.08%--__writeback_single_inode
> | | |
> | |
> --64.35%--do_writepages
> | | |
> | |
> |--59.83%--f2fs_write_node_pages
> | | |
> |
> | | |
> --59.74%--f2fs_sync_node_pages
> | | |
> |
> | | |
> |--27.91%--pagevec_lookup_range_tag
> | | |
> | |
> | | |
> | --27.90%--find_get_pages_range_tag
>
> If filesystem was injected checkpoint errror, before umount, kworker will
> always hold one core in order to writeback a large number of node pages,
> that looks not reasonable, to avoid that, we can allow data/node write in
> such case, since we can force all data/node writes with OPU mode, and
> clear recovery flag on node, and checkpoint is not allowed as well, so we
> don't need to worry about writeback's effect on data/node in previous
> checkpoint, then with this way, it can decrease memory footprint cost by
> node/data pages and avoid looping into data/node writeback process.
>
> Signed-off-by: Chao Yu <yuch...@huawei.com>
> ---
> fs/f2fs/checkpoint.c | 7 +++++++
> fs/f2fs/data.c | 22 +++++++++++++++-------
> fs/f2fs/node.c | 7 +++++--
> 3 files changed, 27 insertions(+), 9 deletions(-)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 236064930251..1bb8278a1c4a 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -1238,6 +1238,13 @@ static int block_operations(struct f2fs_sb_info *sbi)
> goto retry_flush_nodes;
> }
>
> + if (unlikely(f2fs_cp_error(sbi))) {
> + up_write(&sbi->node_write);
> + up_write(&sbi->node_change);
> + f2fs_unlock_all(sbi);
> + return -EIO;
> + }
> +
> /*
> * sbi->node_change is used only for AIO write_begin path which produces
> * dirty node blocks and some checkpoint values by block allocation.
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 267b5e76a02b..808e7734db19 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2508,6 +2508,8 @@ bool f2fs_should_update_outplace(struct inode *inode,
> struct f2fs_io_info *fio)
> {
> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>
> + if (unlikely(f2fs_cp_error(sbi)))
> + return true;
> if (f2fs_lfs_mode(sbi))
> return true;
> if (S_ISDIR(inode->i_mode))
> @@ -2691,13 +2693,19 @@ int f2fs_write_single_data_page(struct page *page,
> int *submitted,
> /* we should bypass data pages to proceed the kworkder jobs */
> if (unlikely(f2fs_cp_error(sbi))) {
> mapping_set_error(page->mapping, -EIO);
> - /*
> - * don't drop any dirty dentry pages for keeping lastest
> - * directory structure.
> - */
> - if (S_ISDIR(inode->i_mode))
> - goto redirty_out;
> - goto out;
> +
> + if (is_sbi_flag_set(sbi, SBI_IS_CLOSE))
> + goto out;
> +
> + if (has_not_enough_free_secs(sbi, 0, 0)) {
> + /*
> + * don't drop any dirty dentry pages for keeping lastest
> + * directory structure.
> + */
> + if (S_ISDIR(inode->i_mode))
> + goto redirty_out;
> + goto out;
> + }
> }
>
> if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index 03e24df1c84f..372c04efad38 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1527,7 +1527,10 @@ static int __write_node_page(struct page *page, bool
> atomic, bool *submitted,
> unlock_page(page);
> return 0;
> }
> - goto redirty_out;
> + if (has_not_enough_free_secs(sbi, 0, 0))
> + goto redirty_out;
> + set_fsync_mark(page, 0);
> + set_dentry_mark(page, 0);
> }
>
> if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
> @@ -1568,7 +1571,7 @@ static int __write_node_page(struct page *page, bool
> atomic, bool *submitted,
> goto redirty_out;
> }
>
> - if (atomic && !test_opt(sbi, NOBARRIER))
> + if (atomic && !test_opt(sbi, NOBARRIER) && !f2fs_cp_error(sbi))
> fio.op_flags |= REQ_PREFLUSH | REQ_FUA;
>
> /* should add to global list before clearing PAGECACHE status */
>
