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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>
This commit is contained in:
Christoph Hellwig 2024-02-15 07:36:38 +01:00 committed by Andrew Morton
parent 2a6e1a8f4c
commit a02829f011
1 changed files with 1 additions and 0 deletions
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mm/page-writeback.c
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@ -2505,6 +2505,7 @@ continue_unlock:
* keep going until we have written all the pages
* we tagged for writeback prior to entering this loop.
*/
done_index = folio->index + nr;
wbc->nr_to_write -= nr;
if (wbc->nr_to_write <= 0 &&
wbc->sync_mode == WB_SYNC_NONE) {