writeback: fix done_index when hitting the wbc->nr_to_write
When write_cache_pages finishes writing out a folio, it fails to update done_index to account for the number of pages in the folio just written. That means when range_cyclic writeback is restarted, it will be restarted at this folio instead of after it as it should. Fix that by updating done_index before breaking out of the loop. Link: https://lkml.kernel.org/r/20240215063649.2164017-4-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Jan Kara <jack@suse.cz> Acked-by: Dave Chinner <dchinner@redhat.com> Cc: Christian Brauner <brauner@kernel.org> Cc: David Howells <dhowells@redhat.com> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -2505,6 +2505,7 @@ continue_unlock:
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* keep going until we have written all the pages
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* we tagged for writeback prior to entering this loop.
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*/
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done_index = folio->index + nr;
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wbc->nr_to_write -= nr;
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if (wbc->nr_to_write <= 0 &&
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wbc->sync_mode == WB_SYNC_NONE) {
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