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Date: Thu, 27 Sep 2018 13:10:58 +0530
From: Sahitya Tummala <stummala@...eaurora.org>
To: Chao Yu <chao@...nel.org>
Cc: jaegeuk@...nel.org, linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH RESEND v2] Revert: "f2fs: check last page
index in cached bio to decide submission"
On Wed, Sep 26, 2018 at 10:44:56PM +0800, Chao Yu wrote:
> From: Chao Yu <yuchao0@...wei.com>
>
> There is one case that we can leave bio in f2fs, result in hanging
> page writeback waiter.
>
> Thread A Thread B
> - f2fs_write_cache_pages
> - f2fs_submit_page_write
> page #0 cached in bio #0 of cold log
> - f2fs_submit_page_write
> page #1 cached in bio #1 of warm log
> - f2fs_write_cache_pages
> - f2fs_submit_page_write
> bio is full, submit bio #1 contain page #1
> - f2fs_submit_merged_write_cond(, page #1)
> fail to submit bio #0 due to page #1 is not in any cached bios.
>
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
> v2:
> - rebase to dev-test
> fs/f2fs/checkpoint.c | 2 +-
> fs/f2fs/data.c | 38 +++++++++++++++++++-------------------
> fs/f2fs/f2fs.h | 4 ++--
> fs/f2fs/node.c | 12 ++++++------
> fs/f2fs/segment.c | 11 +++++------
> 5 files changed, 33 insertions(+), 34 deletions(-)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index d624d7983197..2f63b362ce63 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -280,7 +280,7 @@ static int __f2fs_write_meta_page(struct page *page,
>
> if (wbc->for_reclaim)
> f2fs_submit_merged_write_cond(sbi, page->mapping->host,
> - 0, page->index, META);
> + page, 0, META);
>
> unlock_page(page);
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index be69b6ac6870..b03f9d163175 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -322,8 +322,8 @@ static void __submit_merged_bio(struct f2fs_bio_info *io)
> io->bio = NULL;
> }
>
> -static bool __has_merged_page(struct f2fs_bio_info *io,
> - struct inode *inode, nid_t ino, pgoff_t idx)
> +static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
> + struct page *page, nid_t ino)
> {
> struct bio_vec *bvec;
> struct page *target;
> @@ -332,7 +332,7 @@ static bool __has_merged_page(struct f2fs_bio_info *io,
> if (!io->bio)
> return false;
>
> - if (!inode && !ino)
> + if (!inode && !page && !ino)
> return true;
>
> bio_for_each_segment_all(bvec, io->bio, i) {
> @@ -342,11 +342,10 @@ static bool __has_merged_page(struct f2fs_bio_info *io,
> else
> target = fscrypt_control_page(bvec->bv_page);
>
> - if (idx != target->index)
> - continue;
> -
> if (inode && inode == target->mapping->host)
> return true;
> + if (page && page == target)
> + return true;
If both inode and page are passed, then I think it we should check for page first
followed by inode checks. What do you think?
> if (ino && ino == ino_of_node(target))
> return true;
> }
> @@ -355,7 +354,8 @@ static bool __has_merged_page(struct f2fs_bio_info *io,
> }
>
> static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
> - nid_t ino, pgoff_t idx, enum page_type type)
> + struct page *page, nid_t ino,
> + enum page_type type)
> {
> enum page_type btype = PAGE_TYPE_OF_BIO(type);
> enum temp_type temp;
> @@ -366,7 +366,7 @@ static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
> io = sbi->write_io[btype] + temp;
>
> down_read(&io->io_rwsem);
> - ret = __has_merged_page(io, inode, ino, idx);
> + ret = __has_merged_page(io, inode, page, ino);
> up_read(&io->io_rwsem);
>
> /* TODO: use HOT temp only for meta pages now. */
> @@ -397,12 +397,12 @@ static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
> }
>
> static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
> - struct inode *inode, nid_t ino, pgoff_t idx,
> - enum page_type type, bool force)
> + struct inode *inode, struct page *page,
> + nid_t ino, enum page_type type, bool force)
> {
> enum temp_type temp;
>
> - if (!force && !has_merged_page(sbi, inode, ino, idx, type))
> + if (!force && !has_merged_page(sbi, inode, page, ino, type))
> return;
>
> for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
> @@ -421,10 +421,10 @@ void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type)
> }
>
> void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
> - struct inode *inode, nid_t ino, pgoff_t idx,
> - enum page_type type)
> + struct inode *inode, struct page *page,
> + nid_t ino, enum page_type type)
> {
> - __submit_merged_write_cond(sbi, inode, ino, idx, type, false);
> + __submit_merged_write_cond(sbi, inode, page, ino, type, false);
> }
>
> void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi)
> @@ -1962,7 +1962,7 @@ static int __write_data_page(struct page *page, bool *submitted,
> ClearPageUptodate(page);
>
> if (wbc->for_reclaim) {
> - f2fs_submit_merged_write_cond(sbi, inode, 0, page->index, DATA);
> + f2fs_submit_merged_write_cond(sbi, inode, page, 0, DATA);
> clear_inode_flag(inode, FI_HOT_DATA);
> f2fs_remove_dirty_inode(inode);
> submitted = NULL;
> @@ -2020,10 +2020,10 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> pgoff_t index;
> pgoff_t end; /* Inclusive */
> pgoff_t done_index;
> - pgoff_t last_idx = ULONG_MAX;
> int cycled;
> int range_whole = 0;
> int tag;
> + int nwritten = 0;
>
> pagevec_init(&pvec);
>
> @@ -2126,7 +2126,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> done = 1;
> break;
> } else if (submitted) {
> - last_idx = page->index;
> + nwritten++;
> }
>
> if (--wbc->nr_to_write <= 0 &&
> @@ -2148,9 +2148,9 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
> mapping->writeback_index = done_index;
>
> - if (last_idx != ULONG_MAX)
> + if (nwritten)
> f2fs_submit_merged_write_cond(F2FS_M_SB(mapping), mapping->host,
> - 0, last_idx, DATA);
> + NULL, 0, DATA);
>
> return ret;
> }
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index dc9306e87a51..464545e40729 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3049,8 +3049,8 @@ int f2fs_init_post_read_processing(void);
> void f2fs_destroy_post_read_processing(void);
> void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type);
> void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
> - struct inode *inode, nid_t ino, pgoff_t idx,
> - enum page_type type);
> + struct inode *inode, struct page *page,
> + nid_t ino, enum page_type type);
> void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi);
> int f2fs_submit_page_bio(struct f2fs_io_info *fio);
> void f2fs_submit_page_write(struct f2fs_io_info *fio);
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index ea151e07790f..c47ca807e245 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1561,8 +1561,8 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
> up_read(&sbi->node_write);
>
> if (wbc->for_reclaim) {
> - f2fs_submit_merged_write_cond(sbi, page->mapping->host, 0,
> - page->index, NODE);
> + f2fs_submit_merged_write_cond(sbi, page->mapping->host,
> + page, 0, NODE);
> submitted = NULL;
> }
>
> @@ -1634,13 +1634,13 @@ int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
> unsigned int *seq_id)
> {
> pgoff_t index;
> - pgoff_t last_idx = ULONG_MAX;
> struct pagevec pvec;
> int ret = 0;
> struct page *last_page = NULL;
> bool marked = false;
> nid_t ino = inode->i_ino;
> int nr_pages;
> + int nwritten = 0;
>
> if (atomic) {
> last_page = last_fsync_dnode(sbi, ino);
> @@ -1718,7 +1718,7 @@ int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
> f2fs_put_page(last_page, 0);
> break;
> } else if (submitted) {
> - last_idx = page->index;
> + nwritten++;
> }
>
> if (page == last_page) {
> @@ -1744,8 +1744,8 @@ int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
> goto retry;
> }
> out:
> - if (last_idx != ULONG_MAX)
> - f2fs_submit_merged_write_cond(sbi, NULL, ino, last_idx, NODE);
> + if (nwritten)
> + f2fs_submit_merged_write_cond(sbi, NULL, NULL, ino, NODE);
> return ret ? -EIO: 0;
> }
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 97a4fae75651..965ef524e2a2 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -371,7 +371,7 @@ static int __f2fs_commit_inmem_pages(struct inode *inode)
> .io_type = FS_DATA_IO,
> };
> struct list_head revoke_list;
> - pgoff_t last_idx = ULONG_MAX;
> + bool submit_bio = false;
> int err = 0;
>
> INIT_LIST_HEAD(&revoke_list);
> @@ -406,14 +406,14 @@ static int __f2fs_commit_inmem_pages(struct inode *inode)
> }
> /* record old blkaddr for revoking */
> cur->old_addr = fio.old_blkaddr;
> - last_idx = page->index;
> + submit_bio = true;
> }
> unlock_page(page);
> list_move_tail(&cur->list, &revoke_list);
> }
>
> - if (last_idx != ULONG_MAX)
> - f2fs_submit_merged_write_cond(sbi, inode, 0, last_idx, DATA);
> + if (submit_bio)
> + f2fs_submit_merged_write_cond(sbi, inode, NULL, 0, DATA);
>
> if (err) {
> /*
> @@ -3179,8 +3179,7 @@ void f2fs_wait_on_page_writeback(struct page *page,
> if (PageWriteback(page)) {
> struct f2fs_sb_info *sbi = F2FS_P_SB(page);
>
> - f2fs_submit_merged_write_cond(sbi, page->mapping->host,
> - 0, page->index, type);
> + f2fs_submit_merged_write_cond(sbi, NULL, page, 0, type);
> if (ordered)
> wait_on_page_writeback(page);
> else
> --
> 2.18.0
>
>
>
> _______________________________________________
> Linux-f2fs-devel mailing list
> Linux-f2fs-devel@...ts.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
--
--
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