The patch titled
Subject: mm/filemap: split filemap_readahead out of filemap_get_pages
has been added to the -mm tree. Its filename is
mm-filemap-split-filemap_readahead-out-of-filemap_get_pages.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-filemap-split-filemap_readahead-out-of-filemap_get_pages.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-filemap-split-filemap_readahead-out-of-filemap_get_pages.patch
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm/filemap: split filemap_readahead out of filemap_get_pages
This simplifies the error handling.
Link: https://lkml.kernel.org/r/20210122160140.223228-15-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 | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
--- a/mm/filemap.c~mm-filemap-split-filemap_readahead-out-of-filemap_get_pages
+++ a/mm/filemap.c
@@ -2323,6 +2323,17 @@ error:
return error;
}
+static int filemap_readahead(struct kiocb *iocb, struct file *file,
+ struct address_space *mapping, struct page *page,
+ pgoff_t last_index)
+{
+ if (iocb->ki_flags & IOCB_NOIO)
+ return -EAGAIN;
+ page_cache_async_readahead(mapping, &file->f_ra, file, page,
+ page->index, last_index - page->index);
+ return 0;
+}
+
static int filemap_get_pages(struct kiocb *iocb, struct iov_iter *iter,
struct pagevec *pvec)
{
@@ -2360,17 +2371,15 @@ find_page:
got_pages:
{
struct page *page = pvec->pages[pvec->nr - 1];
- pgoff_t pg_index = page->index;
if (PageReadahead(page)) {
- if (iocb->ki_flags & IOCB_NOIO) {
+ err = filemap_readahead(iocb, filp, mapping, page,
+ last_index);
+ if (err) {
put_page(page);
pvec->nr--;
- err = -EAGAIN;
goto err;
}
- page_cache_async_readahead(mapping, ra, filp, page,
- pg_index, last_index - pg_index);
}
if (!PageUptodate(page)) {
_
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
