The patch titled
Subject: mm/filemap: move the iocb checks into filemap_update_page
has been added to the -mm tree. Its filename is
mm-filemap-move-the-iocb-checks-into-filemap_update_page.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-filemap-move-the-iocb-checks-into-filemap_update_page.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-filemap-move-the-iocb-checks-into-filemap_update_page.patch
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/filemap.c | 24 ++++++++++--------------
1 file changed, 10 insertions(+), 14 deletions(-)
--- a/mm/filemap.c~mm-filemap-move-the-iocb-checks-into-filemap_update_page
+++ a/mm/filemap.c
@@ -2234,15 +2234,16 @@ static int filemap_update_page(struct ki
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)
@@ -2360,14 +2361,9 @@ 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) {
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-debug-improve-memcg-debugging.patch
mm-filemap-rename-generic_file_buffered_read-subfunctions.patch
mm-filemap-remove-dynamically-allocated-array-from-filemap_read.patch
mm-filemap-convert-filemap_get_pages-to-take-a-pagevec.patch
mm-filemap-use-head-pages-in-generic_file_buffered_read.patch
mm-filemap-pass-a-sleep-state-to-put_and_wait_on_page_locked.patch
mm-filemap-support-readpage-splitting-a-page.patch
mm-filemap-inline-__wait_on_page_locked_async-into-caller.patch
mm-filemap-dont-call-readpage-if-iocb_waitq-is-set.patch
mm-filemap-change-filemap_read_page-calling-conventions.patch
mm-filemap-change-filemap_create_page-calling-conventions.patch
mm-filemap-convert-filemap_update_page-to-return-an-errno.patch
mm-filemap-move-the-iocb-checks-into-filemap_update_page.patch
mm-filemap-add-filemap_range_uptodate.patch
mm-filemap-split-filemap_readahead-out-of-filemap_get_pages.patch
mm-filemap-restructure-filemap_get_pages.patch
mm-filemap-dont-relock-the-page-after-calling-readpage.patch
mm-make-pagecache-tagged-lookups-return-only-head-pages.patch
mm-shmem-use-pagevec_lookup-in-shmem_unlock_mapping.patch
mm-swap-optimise-get_shadow_from_swap_cache.patch
mm-add-fgp_entry.patch
mm-filemap-rename-find_get_entry-to-mapping_get_entry.patch
mm-filemap-add-helper-for-finding-pages.patch
mm-filemap-add-helper-for-finding-pages-fix.patch
mm-filemap-add-mapping_seek_hole_data.patch
mm-filemap-add-mapping_seek_hole_data-fix.patch
iomap-use-mapping_seek_hole_data.patch
mm-add-and-use-find_lock_entries.patch
mm-add-and-use-find_lock_entries-fix.patch
mm-add-an-end-parameter-to-find_get_entries.patch
mm-add-an-end-parameter-to-pagevec_lookup_entries.patch
mm-remove-nr_entries-parameter-from-pagevec_lookup_entries.patch
mm-pass-pvec-directly-to-find_get_entries.patch
mm-remove-pagevec_lookup_entries.patch
