diff mbox series

[v2,2/6] iomap: support invalidating partial folios

Message ID 20240812121159.3775074-3-yi.zhang@huaweicloud.com (mailing list archive)
State New
Headers show
Series iomap: some minor non-critical fixes and improvements when block size < folio size | expand

Commit Message

Zhang Yi Aug. 12, 2024, 12:11 p.m. UTC 
From: Zhang Yi <yi.zhang@huawei.com>

Current iomap_invalidate_folio() could only invalidate an entire folio,
if we truncate a partial folio on a filesystem with blocksize < folio
size, it will left over the dirty bits of truncated/punched blocks, and
the write back process will try to map the invalid hole range, but
fortunately it hasn't trigger any real problems now since ->map_blocks()
will fix the length. Fix this by supporting invalidating partial folios.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
 fs/iomap/buffered-io.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Darrick J. Wong Aug. 12, 2024, 4:55 p.m. UTC | #1 
On Mon, Aug 12, 2024 at 08:11:55PM +0800, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@huawei.com>
> 
> Current iomap_invalidate_folio() could only invalidate an entire folio,
> if we truncate a partial folio on a filesystem with blocksize < folio
> size, it will left over the dirty bits of truncated/punched blocks, and
> the write back process will try to map the invalid hole range, but
> fortunately it hasn't trigger any real problems now since ->map_blocks()
> will fix the length. Fix this by supporting invalidating partial folios.
> 
> Signed-off-by: Zhang Yi <yi.zhang@huawei.com>

Seems ok to me
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  fs/iomap/buffered-io.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 4da453394aaf..763deabe8331 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -644,6 +644,8 @@ void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len)
>  		WARN_ON_ONCE(folio_test_writeback(folio));
>  		folio_cancel_dirty(folio);
>  		ifs_free(folio);
> +	} else {
> +		iomap_clear_range_dirty(folio, offset, len);
>  	}
>  }
>  EXPORT_SYMBOL_GPL(iomap_invalidate_folio);
> -- 
> 2.39.2
> 
>
diff mbox series

Patch

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 4da453394aaf..763deabe8331 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -644,6 +644,8 @@  void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len)
 		WARN_ON_ONCE(folio_test_writeback(folio));
 		folio_cancel_dirty(folio);
 		ifs_free(folio);
+	} else {
+		iomap_clear_range_dirty(folio, offset, len);
 	}
 }
 EXPORT_SYMBOL_GPL(iomap_invalidate_folio);