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mm/filemap: move the iocb checks into filemap_update_page 

We don't need to give up when a non-blocking request sees a !Uptodate
page.  We may be able to satisfy the read from a partially-uptodate page.

Link: https://lkml.kernel.org/r/20210122160140.223228-13-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Kent Overstreet <kent.overstreet@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-02-24 12:02:25 -08:00 committed by Linus Torvalds
parent 4612aeef09
commit 87d1d7b688
1 changed files with 10 additions and 14 deletions
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24
mm/filemap.c
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@ -2240,15 +2240,16 @@ static int filemap_update_page(struct kiocb *iocb,
struct inode *inode = mapping->host;
int error;
if (iocb->ki_flags & IOCB_WAITQ) {
error = lock_page_async(page, iocb->ki_waitq);
if (error)
return error;
} else {
if (!trylock_page(page)) {
if (!trylock_page(page)) {
if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_NOIO))
return -EAGAIN;
if (!(iocb->ki_flags & IOCB_WAITQ)) {
put_and_wait_on_page_locked(page, TASK_KILLABLE);
return AOP_TRUNCATED_PAGE;
}
error = __lock_page_async(page, iocb->ki_waitq);
if (error)
return error;
}
if (!page->mapping)
@ -2366,14 +2367,9 @@ got_pages:
}
if (!PageUptodate(page)) {
if ((iocb->ki_flags & IOCB_NOWAIT) ||
((iocb->ki_flags & IOCB_WAITQ) && pvec->nr > 1)) {
put_page(page);
pvec->nr--;
err = -EAGAIN;
goto err;
}
if ((iocb->ki_flags & IOCB_WAITQ) &&
pagevec_count(pvec) > 1)
iocb->ki_flags |= IOCB_NOWAIT;
err = filemap_update_page(iocb, mapping, iter, page,
pg_pos, pg_count);
if (err) {