[PATCH 4.14 170/222] nfs: Fix a missed page unlock after pg_doio()

Greg Kroah-Hartman
2018-11-11T22:33:03Z

From: Benjamin Coddington <bcodding@redhat.com>

commit fdbd1a2e4a71adcb1ae219fcfd964930d77a7f84 upstream.

We must check pg_error and call error_cleanup after any call to pg_doio.
Currently, we are skipping the unlock of a page if we encounter an error in
nfs_pageio_complete() before handing off the work to the RPC layer.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/nfs/pagelist.c | 40 +++++++++++++++++++++-------------------
1 file changed, 21 insertions(+), 19 deletions(-)

--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -1110,6 +1110,20 @@ static int nfs_pageio_add_request_mirror
return ret;
}

+static void nfs_pageio_error_cleanup(struct nfs_pageio_descriptor *desc)
+{
+ u32 midx;
+ struct nfs_pgio_mirror *mirror;
+
+ if (!desc->pg_error)
+ return;
+
+ for (midx = 0; midx < desc->pg_mirror_count; midx++) {
+ mirror = &desc->pg_mirrors[midx];
+ desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
+ }
+}
+
int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
struct nfs_page *req)
{
@@ -1160,25 +1174,11 @@ int nfs_pageio_add_request(struct nfs_pa
return 1;

out_failed:
- /*
- * We might have failed before sending any reqs over wire.
- * Clean up rest of the reqs in mirror pg_list.
- */
- if (desc->pg_error) {
- struct nfs_pgio_mirror *mirror;
- void (*func)(struct list_head *);
-
- /* remember fatal errors */
- if (nfs_error_is_fatal(desc->pg_error))
- nfs_context_set_write_error(req->wb_context,
- desc->pg_error);
-
- func = desc->pg_completion_ops->error_cleanup;
- for (midx = 0; midx < desc->pg_mirror_count; midx++) {
- mirror = &desc->pg_mirrors[midx];
- func(&mirror->pg_list);
- }
- }
+ /* remember fatal errors */
+ if (nfs_error_is_fatal(desc->pg_error))
+ nfs_context_set_write_error(req->wb_context,
+ desc->pg_error);
+ nfs_pageio_error_cleanup(desc);
return 0;
}

@@ -1250,6 +1250,8 @@ void nfs_pageio_complete(struct nfs_page
for (midx = 0; midx < desc->pg_mirror_count; midx++)
nfs_pageio_complete_mirror(desc, midx);

+ if (desc->pg_error < 0)
+ nfs_pageio_error_cleanup(desc);
if (desc->pg_ops->pg_cleanup)
desc->pg_ops->pg_cleanup(desc);
nfs_pageio_cleanup_mirroring(desc);