linux-kernel - [PATCH 1/2] cifs: Add some missing xas

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Date:   Thu, 23 Feb 2023 08:15:38 +0000
From:   David Howells <dhowells@...hat.com>
To:     Steve French <smfrench@...il.com>
Cc:     David Howells <dhowells@...hat.com>,
        Shyam Prasad N <nspmangalore@...il.com>,
        Rohith Surabattula <rohiths.msft@...il.com>,
        Tom Talpey <tom@...pey.com>,
        Stefan Metzmacher <metze@...ba.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jeff Layton <jlayton@...nel.org>, linux-cifs@...r.kernel.org,
        linux-kernel@...r.kernel.org, Steve French <sfrench@...ba.org>
Subject: [PATCH 1/2] cifs: Add some missing xas_retry() calls

The xas_for_each loops added into fs/cifs/file.c need to go round again if
indicated by xas_retry().

Fixes: 5f0955c98375 ("cifs: Add some helper functions")
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Steve French <sfrench@...ba.org>
cc: Shyam Prasad N <nspmangalore@...il.com>
cc: Rohith Surabattula <rohiths.msft@...il.com>
cc: Tom Talpey <tom@...pey.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: linux-cifs@...r.kernel.org
---
 fs/cifs/file.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 0e602173ac76..5c60f4044b65 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -52,6 +52,8 @@ static void cifs_undirty_folios(struct inode *inode, loff_t start, unsigned int
 
 	end = (start + len - 1) / PAGE_SIZE;
 	xas_for_each_marked(&xas, folio, end, PAGECACHE_TAG_DIRTY) {
+		if (xas_retry(&xas, folio))
+			continue;
 		xas_pause(&xas);
 		rcu_read_unlock();
 		folio_lock(folio);
@@ -81,6 +83,8 @@ void cifs_pages_written_back(struct inode *inode, loff_t start, unsigned int len
 
 	end = (start + len - 1) / PAGE_SIZE;
 	xas_for_each(&xas, folio, end) {
+		if (xas_retry(&xas, folio))
+			continue;
 		if (!folio_test_writeback(folio)) {
 			WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
 				  len, start, folio_index(folio), end);
@@ -112,6 +116,8 @@ void cifs_pages_write_failed(struct inode *inode, loff_t start, unsigned int len
 
 	end = (start + len - 1) / PAGE_SIZE;
 	xas_for_each(&xas, folio, end) {
+		if (xas_retry(&xas, folio))
+			continue;
 		if (!folio_test_writeback(folio)) {
 			WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
 				  len, start, folio_index(folio), end);