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Date: Tue, 16 Nov 2021 20:34:26 -0800
From: "Darrick J. Wong" <djwong@...nel.org>
To: "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc: linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
Jens Axboe <axboe@...nel.dk>,
Christoph Hellwig <hch@...radead.org>,
Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 25/28] iomap: Convert iomap_add_to_ioend() to take a
folio
On Mon, Nov 08, 2021 at 04:05:48AM +0000, Matthew Wilcox (Oracle) wrote:
> We still iterate one block at a time, but now we call compound_head()
> less often.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
Looks good!
Reviewed-by: Darrick J. Wong <djwong@...nel.org>
--D
> ---
> fs/iomap/buffered-io.c | 70 ++++++++++++++++++++----------------------
> 1 file changed, 34 insertions(+), 36 deletions(-)
>
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index b168cc0fe8be..90f9f33ffe41 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -1249,29 +1249,29 @@ iomap_can_add_to_ioend(struct iomap_writepage_ctx *wpc, loff_t offset,
> * first; otherwise finish off the current ioend and start another.
> */
> static void
> -iomap_add_to_ioend(struct inode *inode, loff_t offset, struct page *page,
> +iomap_add_to_ioend(struct inode *inode, loff_t pos, struct folio *folio,
> struct iomap_page *iop, struct iomap_writepage_ctx *wpc,
> struct writeback_control *wbc, struct list_head *iolist)
> {
> - sector_t sector = iomap_sector(&wpc->iomap, offset);
> + sector_t sector = iomap_sector(&wpc->iomap, pos);
> unsigned len = i_blocksize(inode);
> - unsigned poff = offset & (PAGE_SIZE - 1);
> + size_t poff = offset_in_folio(folio, pos);
>
> - if (!wpc->ioend || !iomap_can_add_to_ioend(wpc, offset, sector)) {
> + if (!wpc->ioend || !iomap_can_add_to_ioend(wpc, pos, sector)) {
> if (wpc->ioend)
> list_add(&wpc->ioend->io_list, iolist);
> - wpc->ioend = iomap_alloc_ioend(inode, wpc, offset, sector, wbc);
> + wpc->ioend = iomap_alloc_ioend(inode, wpc, pos, sector, wbc);
> }
>
> - if (bio_add_page(wpc->ioend->io_bio, page, len, poff) != len) {
> + if (!bio_add_folio(wpc->ioend->io_bio, folio, len, poff)) {
> wpc->ioend->io_bio = iomap_chain_bio(wpc->ioend->io_bio);
> - __bio_add_page(wpc->ioend->io_bio, page, len, poff);
> + bio_add_folio(wpc->ioend->io_bio, folio, len, poff);
> }
>
> if (iop)
> atomic_add(len, &iop->write_bytes_pending);
> wpc->ioend->io_size += len;
> - wbc_account_cgroup_owner(wbc, page, len);
> + wbc_account_cgroup_owner(wbc, &folio->page, len);
> }
>
> /*
> @@ -1293,9 +1293,8 @@ iomap_add_to_ioend(struct inode *inode, loff_t offset, struct page *page,
> static int
> iomap_writepage_map(struct iomap_writepage_ctx *wpc,
> struct writeback_control *wbc, struct inode *inode,
> - struct page *page, u64 end_pos)
> + struct folio *folio, u64 end_pos)
> {
> - struct folio *folio = page_folio(page);
> struct iomap_page *iop = iomap_page_create(inode, folio);
> struct iomap_ioend *ioend, *next;
> unsigned len = i_blocksize(inode);
> @@ -1322,15 +1321,15 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
> continue;
> if (wpc->iomap.type == IOMAP_HOLE)
> continue;
> - iomap_add_to_ioend(inode, pos, page, iop, wpc, wbc,
> + iomap_add_to_ioend(inode, pos, folio, iop, wpc, wbc,
> &submit_list);
> count++;
> }
>
> WARN_ON_ONCE(!wpc->ioend && !list_empty(&submit_list));
> - WARN_ON_ONCE(!PageLocked(page));
> - WARN_ON_ONCE(PageWriteback(page));
> - WARN_ON_ONCE(PageDirty(page));
> + WARN_ON_ONCE(!folio_test_locked(folio));
> + WARN_ON_ONCE(folio_test_writeback(folio));
> + WARN_ON_ONCE(folio_test_dirty(folio));
>
> /*
> * We cannot cancel the ioend directly here on error. We may have
> @@ -1348,14 +1347,14 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
> if (wpc->ops->discard_folio)
> wpc->ops->discard_folio(folio, pos);
> if (!count) {
> - ClearPageUptodate(page);
> - unlock_page(page);
> + folio_clear_uptodate(folio);
> + folio_unlock(folio);
> goto done;
> }
> }
>
> - set_page_writeback(page);
> - unlock_page(page);
> + folio_start_writeback(folio);
> + folio_unlock(folio);
>
> /*
> * Preserve the original error if there was one; catch
> @@ -1376,9 +1375,9 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
> * with a partial page truncate on a sub-page block sized filesystem.
> */
> if (!count)
> - end_page_writeback(page);
> + folio_end_writeback(folio);
> done:
> - mapping_set_error(page->mapping, error);
> + mapping_set_error(folio->mapping, error);
> return error;
> }
>
> @@ -1392,14 +1391,15 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
> static int
> iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
> {
> + struct folio *folio = page_folio(page);
> struct iomap_writepage_ctx *wpc = data;
> - struct inode *inode = page->mapping->host;
> + struct inode *inode = folio->mapping->host;
> u64 end_pos, isize;
>
> - trace_iomap_writepage(inode, page_offset(page), PAGE_SIZE);
> + trace_iomap_writepage(inode, folio_pos(folio), folio_size(folio));
>
> /*
> - * Refuse to write the page out if we're called from reclaim context.
> + * Refuse to write the folio out if we're called from reclaim context.
> *
> * This avoids stack overflows when called from deeply used stacks in
> * random callers for direct reclaim or memcg reclaim. We explicitly
> @@ -1413,10 +1413,10 @@ iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
> goto redirty;
>
> /*
> - * Is this page beyond the end of the file?
> + * Is this folio beyond the end of the file?
> *
> - * The page index is less than the end_index, adjust the end_offset
> - * to the highest offset that this page should represent.
> + * The folio index is less than the end_index, adjust the end_pos
> + * to the highest offset that this folio should represent.
> * -----------------------------------------------------
> * | file mapping | <EOF> |
> * -----------------------------------------------------
> @@ -1426,7 +1426,7 @@ iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
> * ---------------------------------^------------------|
> */
> isize = i_size_read(inode);
> - end_pos = page_offset(page) + PAGE_SIZE;
> + end_pos = folio_pos(folio) + folio_size(folio);
> if (end_pos > isize) {
> /*
> * Check whether the page to write out is beyond or straddles
> @@ -1439,7 +1439,7 @@ iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
> * | | Straddles |
> * ---------------------------------^-----------|--------|
> */
> - size_t poff = offset_in_page(isize);
> + size_t poff = offset_in_folio(folio, isize);
> pgoff_t end_index = isize >> PAGE_SHIFT;
>
> /*
> @@ -1459,8 +1459,8 @@ iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
> * checking if the page is totally beyond i_size or if its
> * offset is just equal to the EOF.
> */
> - if (page->index > end_index ||
> - (page->index == end_index && poff == 0))
> + if (folio->index > end_index ||
> + (folio->index == end_index && poff == 0))
> goto redirty;
>
> /*
> @@ -1471,17 +1471,15 @@ iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
> * memory is zeroed when mapped, and writes to that region are
> * not written out to the file."
> */
> - zero_user_segment(page, poff, PAGE_SIZE);
> -
> - /* Adjust the end_offset to the end of file */
> + folio_zero_segment(folio, poff, folio_size(folio));
> end_pos = isize;
> }
>
> - return iomap_writepage_map(wpc, wbc, inode, page, end_pos);
> + return iomap_writepage_map(wpc, wbc, inode, folio, end_pos);
>
> redirty:
> - redirty_page_for_writepage(wbc, page);
> - unlock_page(page);
> + folio_redirty_for_writepage(wbc, folio);
> + folio_unlock(folio);
> return 0;
> }
>
> --
> 2.33.0
>
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