Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
filemap: Add a version of folio_end_writeback that ignores dropbehind
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>
authored by
Trond Myklebust
and committed by
Anna Schumaker
010054a5
24bbd533
+24
-6
+1
include/linux/pagemap.h
+1
include/linux/pagemap.h
···
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int folio_wait_writeback_killable(struct folio *folio);
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void end_page_writeback(struct page *page);
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void folio_end_writeback(struct folio *folio);
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+
void folio_end_writeback_no_dropbehind(struct folio *folio);
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void folio_end_dropbehind(struct folio *folio);
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void folio_wait_stable(struct folio *folio);
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void __folio_mark_dirty(struct folio *folio, struct address_space *, int warn);
+23
-6
mm/filemap.c
+23
-6
mm/filemap.c
···
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EXPORT_SYMBOL_GPL(folio_end_dropbehind);
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/**
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-
* folio_end_writeback - End writeback against a folio.
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* folio_end_writeback_no_dropbehind - End writeback against a folio.
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* @folio: The folio.
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*
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* The folio must actually be under writeback.
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* This call is intended for filesystems that need to defer dropbehind.
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*
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* Context: May be called from process or interrupt context.
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*/
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-
void folio_end_writeback(struct folio *folio)
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void folio_end_writeback_no_dropbehind(struct folio *folio)
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{
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VM_BUG_ON_FOLIO(!folio_test_writeback(folio), folio);
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···
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folio_rotate_reclaimable(folio);
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}
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+
if (__folio_end_writeback(folio))
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+
folio_wake_bit(folio, PG_writeback);
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+
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acct_reclaim_writeback(folio);
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+
}
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EXPORT_SYMBOL_GPL(folio_end_writeback_no_dropbehind);
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+
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/**
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* folio_end_writeback - End writeback against a folio.
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* @folio: The folio.
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*
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* The folio must actually be under writeback.
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*
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* Context: May be called from process or interrupt context.
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*/
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void folio_end_writeback(struct folio *folio)
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{
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VM_BUG_ON_FOLIO(!folio_test_writeback(folio), folio);
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+
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/*
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* Writeback does not hold a folio reference of its own, relying
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* on truncation to wait for the clearing of PG_writeback.
···
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* reused before the folio_wake_bit().
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*/
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folio_get(folio);
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-
if (__folio_end_writeback(folio))
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folio_wake_bit(folio, PG_writeback);
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-
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folio_end_writeback_no_dropbehind(folio);
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folio_end_dropbehind(folio);
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-
acct_reclaim_writeback(folio);
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folio_put(folio);
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}
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EXPORT_SYMBOL(folio_end_writeback);