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FAILED: patch "[PATCH] NFSv4.1: Apply session size limits on clone path" failed to apply to 6.12-stable tree

PATCH [email protected] 1 participant 1 message May 4

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The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 8c787b286f39c7584440b97b92f87cbe934c13ff
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026050421-record-carnivore-1a7e@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8c787b286f39c7584440b97b92f87cbe934c13ff Mon Sep 17 00:00:00 2001
From: Tushar Sariya <[email protected]>
Date: Sat, 4 Apr 2026 11:58:03 -0230
Subject: [PATCH] NFSv4.1: Apply session size limits on clone path

nfs4_clone_server() builds a child nfs_server for same-server automounted submounts but never calls nfs4_session_limit_rwsize() or nfs4_session_limit_xasize() after nfs_clone_server(). This means the child mount can end up with rsize/wsize values that exceed the negotiated session channel limits, causing NFS4ERR_REQ_TOO_BIG and EIO on servers that enforce tight max_request_size budgets.

Top-level mounts go through nfs4_server_common_setup() which calls these limiters after nfs_probe_server(). Apply the same clamping on the clone path for consistency.

Fixes 2b092175f5e3 ("NFS: Fix inheritance of the block sizes when automounting")
Cc [email protected]
Signed-off-by Tushar Sariya <[email protected]>
Signed-off-by Trond Myklebust <[email protected]>
fs/nfs/internal.h +2 -0
index 63e09dfc27a8..0338603e9674 100644
@@ -253,6 +253,8 @@ extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 					     u32 minor_version);
 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
 						struct inode *);
+extern void nfs4_session_limit_rwsize(struct nfs_server *server);
+extern void nfs4_session_limit_xasize(struct nfs_server *server);
 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
 			const struct sockaddr_storage *ds_addr, int ds_addrlen,
 			int ds_proto, unsigned int ds_timeo,
fs/nfs/nfs4client.c +2 -2
index c211639949c2..71c271a1700a 100644
@@ -855,7 +855,7 @@ EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
  * Limit the mount rsize, wsize and dtsize using negotiated fore
  * channel attributes.
  */
-static void nfs4_session_limit_rwsize(struct nfs_server *server)
+void nfs4_session_limit_rwsize(struct nfs_server *server)
 {
 	struct nfs4_session *sess;
 	u32 server_resp_sz;

@@ -878,7 +878,7 @@ static void nfs4_session_limit_rwsize(struct nfs_server *server)
 /*
  * Limit xattr sizes using the channel attributes.
  */
-static void nfs4_session_limit_xasize(struct nfs_server *server)
+void nfs4_session_limit_xasize(struct nfs_server *server)
 {
 #ifdef CONFIG_NFS_V4_2
 	struct nfs4_session *sess;
fs/nfs/nfs4proc.c +3 -0
index c2078545242e..7225b4cfa6c2 100644
@@ -10637,6 +10637,9 @@ static struct nfs_server *nfs4_clone_server(struct nfs_server *source,
 	if (IS_ERR(server))
 		return server;
 
+	nfs4_session_limit_rwsize(server);
+	nfs4_session_limit_xasize(server);
+
 	error = nfs4_delegation_hash_alloc(server);
 	if (error) {
 		nfs_free_server(server);