The readpage operation can block in many (most?) filesystems, so we
should punt to a work queue instead of calling it. This was the last
caller of lock_page_async(), so remove it.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
mm/filemap.c | 14 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 7a4101ceb106..5bafd2dc830c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2152,16 +2152,6 @@ static void shrink_readahead_size_eio(struct file_ra_state *ra)
ra->ra_pages /= 4;
}
-static int lock_page_for_iocb(struct kiocb *iocb, struct page *page)
-{
- if (iocb->ki_flags & IOCB_WAITQ)
- return lock_page_async(page, iocb->ki_waitq);
- else if (iocb->ki_flags & IOCB_NOWAIT)
- return trylock_page(page) ? 0 : -EAGAIN;
- else
- return lock_page_killable(page);
-}
-
static unsigned mapping_get_read_thps(struct address_space *mapping,
pgoff_t index, unsigned int nr_pages, struct page **pages)
{
@@ -2210,7 +2200,7 @@ static struct page *filemap_read_page(struct kiocb *iocb, struct file *filp,
struct file_ra_state *ra = &filp->f_ra;
int error;
- if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT)) {
+ if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT | IOCB_WAITQ)) {
unlock_page(page);
put_page(page);
return ERR_PTR(-EAGAIN);
@@ -2231,7 +2221,7 @@ static struct page *filemap_read_page(struct kiocb *iocb, struct file *filp,
}
if (!PageUptodate(page)) {
- error = lock_page_for_iocb(iocb, page);
+ error = lock_page_killable(page);
if (unlikely(error)) {
put_page(page);
return ERR_PTR(error);
--
2.28.0
