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mm: add folio_end_read()

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Provide a function for filesystems to call when they have finished reading
an entire folio.

Link: https://lkml.kernel.org/r/20231004165317.1061855-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-10-04 17:53:03 +01:00 committed by Andrew Morton
parent f45b494e2a
commit 0b237047d5
2 changed files with 23 additions and 0 deletions
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1
include/linux/pagemap.h
View File

@ -1101,6 +1101,7 @@ static inline void wait_on_page_locked(struct page *page)
folio_wait_locked(page_folio(page));
}
void folio_end_read(struct folio *folio, bool success);
void wait_on_page_writeback(struct page *page);
void folio_wait_writeback(struct folio *folio);
int folio_wait_writeback_killable(struct folio *folio);

22
mm/filemap.c
View File

@ -1525,6 +1525,28 @@ void folio_unlock(struct folio *folio)
}
EXPORT_SYMBOL(folio_unlock);
/**
* folio_end_read - End read on a folio.
* @folio: The folio.
* @success: True if all reads completed successfully.
*
* When all reads against a folio have completed, filesystems should
* call this function to let the pagecache know that no more reads
* are outstanding. This will unlock the folio and wake up any thread
* sleeping on the lock. The folio will also be marked uptodate if all
* reads succeeded.
*
* Context: May be called from interrupt or process context. May not be
* called from NMI context.
*/
void folio_end_read(struct folio *folio, bool success)
{
if (likely(success))
folio_mark_uptodate(folio);
folio_unlock(folio);
}
EXPORT_SYMBOL(folio_end_read);
/**
* folio_end_private_2 - Clear PG_private_2 and wake any waiters.
* @folio: The folio.