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authorChristoph Hellwig <hch@lst.de>2023-12-07 08:26:57 +0100
committerChristian Brauner <brauner@kernel.org>2024-02-01 14:20:06 +0100
commit7ea1d9b4a840c2dd01d1234663d4a8ef256cfe39 (patch)
tree6dc566c1a592494d2e5030e0f15c3b15bd71e2e9 /fs/iomap
parent6613476e225e090cc9aad49be7fa504e290dd33d (diff)
iomap: clear the per-folio dirty bits on all writeback failures
write_cache_pages always clear the page dirty bit before calling into the file systems, and leaves folios with a writeback failure without the dirty bit after return. We also clear the per-block writeback bits for writeback failures unless no I/O has submitted, which will leave the folio in an inconsistent state where it doesn't have the folio dirty, but one or more per-block dirty bits. This seems to be due the place where the iomap_clear_range_dirty call was inserted into the existing not very clearly structured code when adding per-block dirty bit support and not actually intentional. Switch to always clearing the dirty on writeback failure. Fixes: 4ce02c679722 ("iomap: Add per-block dirty state tracking to improve performance") Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20231207072710.176093-2-hch@lst.de Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/iomap')
-rw-r--r--fs/iomap/buffered-io.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 093c4515b22a..228fd2e05e12 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1833,16 +1833,10 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
if (unlikely(error)) {
/*
* Let the filesystem know what portion of the current page
- * failed to map. If the page hasn't been added to ioend, it
- * won't be affected by I/O completion and we must unlock it
- * now.
+ * failed to map.
*/
if (wpc->ops->discard_folio)
wpc->ops->discard_folio(folio, pos);
- if (!count) {
- folio_unlock(folio);
- goto done;
- }
}
/*
@@ -1851,6 +1845,16 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
* all the dirty bits in the folio here.
*/
iomap_clear_range_dirty(folio, 0, folio_size(folio));
+
+ /*
+ * If the page hasn't been added to the ioend, it won't be affected by
+ * I/O completion and we must unlock it now.
+ */
+ if (error && !count) {
+ folio_unlock(folio);
+ goto done;
+ }
+
folio_start_writeback(folio);
folio_unlock(folio);