From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
hch@lst.de, kent.overstreet@gmail.com
Subject: [PATCH 10/17] mm/filemap: Move the iocb checks into filemap_update_page
Date: Mon, 2 Nov 2020 18:43:05 +0000 [thread overview]
Message-ID: <20201102184312.25926-11-willy@infradead.org> (raw)
In-Reply-To: <20201102184312.25926-1-willy@infradead.org>
We don't need to give up when a special request sees a !Uptodate page.
We may be able to satisfy the read from a partially-uptodate page.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
mm/filemap.c | 28 ++++++++++++----------------
1 file changed, 12 insertions(+), 16 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index ebb14fdec0cc..41b90243f4ee 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2230,17 +2230,21 @@ static int filemap_read_page(struct file *file, struct address_space *mapping,
static int filemap_update_page(struct kiocb *iocb,
struct address_space *mapping, struct iov_iter *iter,
- struct page *page, loff_t pos, loff_t count)
+ struct page *page, loff_t pos, loff_t count, bool first)
{
struct inode *inode = mapping->host;
- int error;
+ int error = -EAGAIN;
- if (iocb->ki_flags & IOCB_WAITQ) {
- error = lock_page_async(page, iocb->ki_waitq);
- if (error)
+ if (!trylock_page(page)) {
+ if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_NOIO))
goto error;
- } else {
- if (!trylock_page(page)) {
+ if (iocb->ki_flags & IOCB_WAITQ) {
+ if (!first)
+ goto error;
+ error = __lock_page_async(page, iocb->ki_waitq);
+ if (error)
+ goto error;
+ } else {
put_and_wait_on_page_locked(page, TASK_KILLABLE);
return AOP_TRUNCATED_PAGE;
}
@@ -2359,16 +2363,8 @@ static int filemap_get_pages(struct kiocb *iocb, struct iov_iter *iter,
}
if (!PageUptodate(page)) {
- if ((iocb->ki_flags & IOCB_NOWAIT) ||
- ((iocb->ki_flags & IOCB_WAITQ) && nr_got > 1)) {
- put_page(page);
- nr_got--;
- err = -EAGAIN;
- goto err;
- }
-
err = filemap_update_page(iocb, mapping, iter, page,
- pg_pos, pg_count);
+ pg_pos, pg_count, nr_got == 1);
if (err)
nr_got--;
}
--
2.28.0
next prev parent reply other threads:[~2020-11-02 18:43 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-02 18:42 [PATCH 00/17] Refactor generic_file_buffered_read Matthew Wilcox (Oracle)
2020-11-02 18:42 ` [PATCH 01/17] mm/filemap: Rename generic_file_buffered_read subfunctions Matthew Wilcox (Oracle)
2020-11-02 18:53 ` Kent Overstreet
2020-11-03 7:27 ` Christoph Hellwig
2020-11-03 14:52 ` Matthew Wilcox
2020-11-03 15:02 ` Amy Parker
2020-11-02 18:42 ` [PATCH 02/17] mm/filemap: Use THPs in generic_file_buffered_read Matthew Wilcox (Oracle)
2020-11-02 18:55 ` Kent Overstreet
2020-11-03 7:28 ` Christoph Hellwig
2020-11-02 18:42 ` [PATCH 03/17] mm/filemap: Pass a sleep state to put_and_wait_on_page_locked Matthew Wilcox (Oracle)
2020-11-02 18:56 ` Kent Overstreet
2020-11-03 7:28 ` Christoph Hellwig
2020-11-02 18:42 ` [PATCH 04/17] mm/filemap: Support readpage splitting a page Matthew Wilcox (Oracle)
2020-11-02 19:00 ` Kent Overstreet
2020-11-02 19:03 ` Matthew Wilcox
2020-11-02 19:12 ` Kent Overstreet
2020-11-03 7:31 ` Christoph Hellwig
2020-11-02 18:43 ` [PATCH 05/17] mm/filemap: Inline __wait_on_page_locked_async into caller Matthew Wilcox (Oracle)
2020-11-02 19:00 ` Kent Overstreet
2020-11-03 7:31 ` Christoph Hellwig
2020-11-02 18:43 ` [PATCH 06/17] mm/filemap: Don't call ->readpage if IOCB_WAITQ is set Matthew Wilcox (Oracle)
2020-11-02 19:17 ` Kent Overstreet
2020-11-03 7:31 ` Christoph Hellwig
2020-11-05 7:22 ` Nikolay Borisov
2020-11-02 18:43 ` [PATCH 07/17] mm/filemap: Change filemap_read_page calling conventions Matthew Wilcox (Oracle)
2020-11-02 19:37 ` Kent Overstreet
2020-11-03 7:34 ` Christoph Hellwig
2020-11-03 15:11 ` Matthew Wilcox
2020-11-02 18:43 ` [PATCH 08/17] mm/filemap: Change filemap_create_page arguments Matthew Wilcox (Oracle)
2020-11-02 19:38 ` Kent Overstreet
2020-11-03 7:35 ` Christoph Hellwig
2020-11-02 18:43 ` [PATCH 09/17] mm/filemap: Convert filemap_update_page to return an errno Matthew Wilcox (Oracle)
2020-11-02 19:39 ` Kent Overstreet
2020-11-03 7:36 ` Christoph Hellwig
2020-11-02 18:43 ` Matthew Wilcox (Oracle) [this message]
2020-11-02 19:45 ` [PATCH 10/17] mm/filemap: Move the iocb checks into filemap_update_page Kent Overstreet
2020-11-03 7:41 ` Christoph Hellwig
2020-11-02 18:43 ` [PATCH 11/17] mm/filemap: Add filemap_range_uptodate Matthew Wilcox (Oracle)
2020-11-02 19:50 ` Kent Overstreet
2020-11-02 20:09 ` Matthew Wilcox
2020-11-03 7:49 ` Christoph Hellwig
2020-11-03 15:18 ` Matthew Wilcox
2020-11-03 15:31 ` Christoph Hellwig
2020-11-03 15:42 ` Matthew Wilcox
2020-11-02 18:43 ` [PATCH 12/17] mm/filemap: Split filemap_readahead out of filemap_get_pages Matthew Wilcox (Oracle)
2020-11-02 19:52 ` Kent Overstreet
2020-11-02 18:43 ` [PATCH 13/17] mm/filemap: Remove parameters from filemap_update_page() Matthew Wilcox (Oracle)
2020-11-02 19:52 ` Kent Overstreet
2020-11-03 7:50 ` Christoph Hellwig
2020-11-02 18:43 ` [PATCH 14/17] mm/filemap: Restructure filemap_get_pages Matthew Wilcox (Oracle)
2020-11-02 20:05 ` Kent Overstreet
2020-11-03 7:57 ` Christoph Hellwig
2020-11-03 14:46 ` Matthew Wilcox
2020-11-03 15:29 ` Christoph Hellwig
2020-11-02 18:43 ` [PATCH 15/17] mm/filemap: Don't relock the page after calling readpage Matthew Wilcox (Oracle)
2020-11-02 20:06 ` Kent Overstreet
2020-11-03 8:00 ` Christoph Hellwig
2020-11-03 15:24 ` Matthew Wilcox
2020-11-03 17:13 ` Christoph Hellwig
2020-11-03 18:55 ` Matthew Wilcox
2020-11-02 18:43 ` [PATCH 16/17] mm/filemap: rename generic_file_buffered_read to filemap_read Matthew Wilcox (Oracle)
2020-11-02 20:06 ` Kent Overstreet
2020-11-02 18:43 ` [PATCH 17/17] mm: simplify generic_file_read_iter Matthew Wilcox (Oracle)
2020-11-02 20:07 ` Kent Overstreet
2020-11-02 20:14 ` [PATCH 00/17] Refactor generic_file_buffered_read Kent Overstreet
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