2021-06-29 09:12:30

by David Wysochanski

[permalink] [raw]
Subject: [PATCH v2 2/4] NFS: Ensure nfs_readpage returns promptly when internal error occurs

A previous refactoring of nfs_readpage() might end up calling
wait_on_page_locked_killable() even if readpage_async_filler() failed
with an internal error and pg_error was non-zero (for example, if
nfs_create_request() failed). In the case of an internal error,
skip over wait_on_page_locked_killable() as this is only needed
when the read is sent and an error occurs during completion handling.

Signed-off-by: Dave Wysochanski <[email protected]>
---
fs/nfs/read.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 684a730f6670..eb390eb618b3 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -373,10 +373,10 @@ int nfs_readpage(struct file *file, struct page *page)
&nfs_async_read_completion_ops);

ret = readpage_async_filler(&desc, page);
+ if (ret)
+ goto out;

- if (!ret)
- nfs_pageio_complete_read(&desc.pgio);
-
+ nfs_pageio_complete_read(&desc.pgio);
ret = desc.pgio.pg_error < 0 ? desc.pgio.pg_error : 0;
if (!ret) {
ret = wait_on_page_locked_killable(page);
--
1.8.3.1