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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2021-02-24 21:02:25 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-24 22:38:28 +0100 |
| commit | 87d1d7b688319ae1580f057faa460d7f0b381430 (patch) | |
| tree | 1bcfc3c7dd5844b5f88b2f13591dae2c63fc12b4 /mm/filemap.c | |
| parent | mm/filemap: convert filemap_update_page to return an errno (diff) | |
| download | linux-87d1d7b688319ae1580f057faa460d7f0b381430.tar.xz linux-87d1d7b688319ae1580f057faa460d7f0b381430.zip | |
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 '')
| -rw-r--r-- | mm/filemap.c | 24 |
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) { |