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authorMatthew Wilcox (Oracle) <willy@infradead.org>2021-02-24 23:02:25 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-25 00:38:28 +0300
commit87d1d7b688319ae1580f057faa460d7f0b381430 (patch)
tree1bcfc3c7dd5844b5f88b2f13591dae2c63fc12b4 /mm
parent4612aeef09ec492ca5877e06f0dbac5383da5e88 (diff)
downloadlinux-87d1d7b688319ae1580f057faa460d7f0b381430.tar.xz
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c24
1 files changed, 10 insertions, 14 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 67c4df82aa41..cd863c4ff9ae 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -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) {