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filemap: Add a version of folio_end_writeback that ignores dropbehind

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Filesystems such as NFS may need to defer dropbehind until after their
2-stage writes are done. This adds a helper
folio_end_writeback_no_dropbehind() that allows them to release the
writeback flag without immediately dropping the folio.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
This commit is contained in:
Trond Myklebust 2025-09-06 12:48:15 -04:00 committed by Anna Schumaker
parent 24bbd533f5
commit 010054a530
2 changed files with 24 additions and 6 deletions
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1
include/linux/pagemap.h
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@ -1221,6 +1221,7 @@ void folio_wait_writeback(struct folio *folio);
int folio_wait_writeback_killable(struct folio *folio);
void end_page_writeback(struct page *page);
void folio_end_writeback(struct folio *folio);
void folio_end_writeback_no_dropbehind(struct folio *folio);
void folio_end_dropbehind(struct folio *folio);
void folio_wait_stable(struct folio *folio);
void __folio_mark_dirty(struct folio *folio, struct address_space *, int warn);

29
mm/filemap.c
View File

@ -1628,14 +1628,15 @@ void folio_end_dropbehind(struct folio *folio)
EXPORT_SYMBOL_GPL(folio_end_dropbehind);
/**
* folio_end_writeback - End writeback against a folio.
* folio_end_writeback_no_dropbehind - End writeback against a folio.
* @folio: The folio.
*
* The folio must actually be under writeback.
* This call is intended for filesystems that need to defer dropbehind.
*
* Context: May be called from process or interrupt context.
*/
void folio_end_writeback(struct folio *folio)
void folio_end_writeback_no_dropbehind(struct folio *folio)
{
VM_BUG_ON_FOLIO(!folio_test_writeback(folio), folio);
@ -1651,6 +1652,25 @@ void folio_end_writeback(struct folio *folio)
folio_rotate_reclaimable(folio);
}
if (__folio_end_writeback(folio))
folio_wake_bit(folio, PG_writeback);
acct_reclaim_writeback(folio);
}
EXPORT_SYMBOL_GPL(folio_end_writeback_no_dropbehind);
/**
* folio_end_writeback - End writeback against a folio.
* @folio: The folio.
*
* The folio must actually be under writeback.
*
* Context: May be called from process or interrupt context.
*/
void folio_end_writeback(struct folio *folio)
{
VM_BUG_ON_FOLIO(!folio_test_writeback(folio), folio);
/*
* Writeback does not hold a folio reference of its own, relying
* on truncation to wait for the clearing of PG_writeback.
@ -1658,11 +1678,8 @@ void folio_end_writeback(struct folio *folio)
* reused before the folio_wake_bit().
*/
folio_get(folio);
if (__folio_end_writeback(folio))
folio_wake_bit(folio, PG_writeback);
folio_end_writeback_no_dropbehind(folio);
folio_end_dropbehind(folio);
acct_reclaim_writeback(folio);
folio_put(folio);
}
EXPORT_SYMBOL(folio_end_writeback);