Re: [PATCH v14 128/138] iomap: Support multi-page folios in invalidatepage
From: "Darrick J. Wong" <djwong@kernel.org>
Date: 2021-07-15 22:10:20
Also in:
linux-fsdevel, lkml
On Thu, Jul 15, 2021 at 04:36:54AM +0100, Matthew Wilcox (Oracle) wrote:
If we're punching a hole in a multi-page folio, we need to remove the per-page iomap data as the folio is about to be split and each page will need its own. This means that writepage can now come across a page with no iop allocated, so remove the assertion that there is already one, and just create one (with the uptodate bits set) if there isn't one. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Lol, Andreas already did the bottom half of the change for you. Reviewed-by: Darrick J. Wong <djwong@kernel.org> --D
quoted hunk ↗ jump to hunk
--- fs/iomap/buffered-io.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 48de198c5603..7f78256fc0ba 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c@@ -474,13 +474,17 @@ iomap_invalidatepage(struct page *page, unsigned int offset, unsigned int len) trace_iomap_invalidatepage(folio->mapping->host, offset, len); /* - * If we are invalidating the entire page, clear the dirty state from it - * and release it to avoid unnecessary buildup of the LRU. + * If we are invalidating the entire folio, clear the dirty state + * from it and release it to avoid unnecessary buildup of the LRU. */ if (offset == 0 && len == folio_size(folio)) { WARN_ON_ONCE(folio_test_writeback(folio)); folio_cancel_dirty(folio); iomap_page_release(folio); + } else if (folio_multi(folio)) { + /* Must release the iop so the page can be split */ + WARN_ON_ONCE(!folio_test_uptodate(folio) && folio_test_dirty(folio)); + iomap_page_release(folio); } } EXPORT_SYMBOL_GPL(iomap_invalidatepage);@@ -1300,7 +1304,7 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, struct writeback_control *wbc, struct inode *inode, struct folio *folio, loff_t end_pos) { - struct iomap_page *iop = to_iomap_page(folio); + struct iomap_page *iop = iomap_page_create(inode, folio); struct iomap_ioend *ioend, *next; unsigned len = i_blocksize(inode); unsigned nblocks = i_blocks_per_folio(inode, folio);@@ -1308,7 +1312,6 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, int error = 0, count = 0, i; LIST_HEAD(submit_list); - WARN_ON_ONCE(nblocks > 1 && !iop); WARN_ON_ONCE(iop && atomic_read(&iop->write_bytes_pending) != 0); /*-- 2.30.2