[PATCH 6.18 234/377] netfs: Fix netfs_read_to_pagecache() to pause on subreq failure

6.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <[email protected]>

[ Upstream commit 8a8c0cfdf4658fc5b295b7fc87be56e0d76741f4 ]

Fix netfs_read_to_pagecache() so that it pauses the generation of new
subrequests if an already-issued subrequest fails.

Fixes: ee4cdf7ba857 ("netfs: Speed up buffered reading")
Closes: https://sashiko.dev/#/patchset/20260425125426.3855807-1-dhowells%40redhat.com
Signed-off-by: David Howells <[email protected]>
Link: https://patch.msgid.link/[email protected]
cc: Paulo Alcantara <[email protected]>
cc: [email protected]
cc: [email protected]
Signed-off-by: Christian Brauner <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
 fs/netfs/buffered_read.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c
index 10b13924ed543..e6157122da3a4 100644
--- a/fs/netfs/buffered_read.c
+++ b/fs/netfs/buffered_read.c
@@ -299,6 +299,11 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq,
 		}
 
 		netfs_issue_read(rreq, subreq);
+
+		if (test_bit(NETFS_RREQ_PAUSE, &rreq->flags))
+			netfs_wait_for_paused_read(rreq);
+		if (test_bit(NETFS_RREQ_FAILED, &rreq->flags))
+			break;
 		cond_resched();
 	} while (size > 0);
 
-- 
2.53.0