diff mbox series

[v5,09/23] cifs: Convert wdata_alloc_and_fillpages() to use filemap_get_folios_tag()

Message ID 20230104211448.4804-10-vishal.moola@gmail.com
State New
Headers show
Series Convert to filemap_get_folios_tag() | expand

Commit Message

Vishal Moola Jan. 4, 2023, 9:14 p.m. UTC 
This is in preparation for the removal of find_get_pages_range_tag(). Now also
supports the use of large folios.

Since tofind might be larger than the max number of folios in a
folio_batch (15), we loop through filling in wdata->pages pulling more
batches until we either reach tofind pages or run out of folios.

This function may not return all pages in the last found folio before
tofind pages are reached.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
---
 fs/cifs/file.c | 32 +++++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

Comments

Paulo Alcantara Jan. 12, 2023, 7:23 p.m. UTC | #1 
"Vishal Moola (Oracle)" <vishal.moola@gmail.com> writes:

> This is in preparation for the removal of find_get_pages_range_tag(). Now also
> supports the use of large folios.
>
> Since tofind might be larger than the max number of folios in a
> folio_batch (15), we loop through filling in wdata->pages pulling more
> batches until we either reach tofind pages or run out of folios.
>
> This function may not return all pages in the last found folio before
> tofind pages are reached.
>
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
> ---
>  fs/cifs/file.c | 32 +++++++++++++++++++++++++++++---
>  1 file changed, 29 insertions(+), 3 deletions(-)

Looks good.

Acked-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
diff mbox series

Patch

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 22dfc1f8b4f1..8cdd2f67af24 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2527,14 +2527,40 @@  wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping,
 			  unsigned int *found_pages)
 {
 	struct cifs_writedata *wdata;
-
+	struct folio_batch fbatch;
+	unsigned int i, idx, p, nr;
 	wdata = cifs_writedata_alloc((unsigned int)tofind,
 				     cifs_writev_complete);
 	if (!wdata)
 		return NULL;
 
-	*found_pages = find_get_pages_range_tag(mapping, index, end,
-				PAGECACHE_TAG_DIRTY, tofind, wdata->pages);
+	folio_batch_init(&fbatch);
+	*found_pages = 0;
+
+again:
+	nr = filemap_get_folios_tag(mapping, index, end,
+				PAGECACHE_TAG_DIRTY, &fbatch);
+	if (!nr)
+		goto out; /* No dirty pages left in the range */
+
+	for (i = 0; i < nr; i++) {
+		struct folio *folio = fbatch.folios[i];
+
+		idx = 0;
+		p = folio_nr_pages(folio);
+add_more:
+		wdata->pages[*found_pages] = folio_page(folio, idx);
+		folio_get(folio);
+		if (++*found_pages == tofind) {
+			folio_batch_release(&fbatch);
+			goto out;
+		}
+		if (++idx < p)
+			goto add_more;
+	}
+	folio_batch_release(&fbatch);
+	goto again;
+out:
 	return wdata;
 }