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mm: assert the folio is locked in folio_start_writeback()

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The folio must be locked when we start writeback in order to prevent
writeback from being started twice on the same folio.  I don't expect this
to catch any problems, but it should be good documentation.

Link: https://lkml.kernel.org/r/20250226153614.3774896-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2025-02-26 15:36:12 +00:00 committed by Andrew Morton
parent a58f3dcf20
commit 173a3dc051
1 changed files with 1 additions and 0 deletions
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mm/page-writeback.c
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@ -3109,6 +3109,7 @@ void __folio_start_writeback(struct folio *folio, bool keep_write)
int access_ret;
VM_BUG_ON_FOLIO(folio_test_writeback(folio), folio);
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
if (mapping && mapping_use_writeback_tags(mapping)) {
XA_STATE(xas, &mapping->i_pages, folio_index(folio));