mm/writeback: Add folio_start_writeback()

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Rename set_page_writeback() to folio_start_writeback() to match
folio_end_writeback().  Do not bother with wrappers that return void;
callers are perfectly capable of ignoring return values.

Add wrappers for set_page_writeback(), set_page_writeback_keepwrite() and
test_set_page_writeback() for compatibililty with existing filesystems.
The main advantage of this patch is getting the statistics right,
although it does eliminate a couple of calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>

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This commit is contained in:

Matthew Wilcox (Oracle) 2021-04-24 12:00:48 -04:00

parent 269ccca389

commit f143f1ea5a

3 changed files with 36 additions and 28 deletions

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23

include/linux/page-flags.h

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6

mm/folio-compat.c

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39

mm/page-writeback.c

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