linux-kernel - [PATCH RFC v2 09/28] filelock: lift the ban on directory leases in generic

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Message-Id: <20250602-dir-deleg-v2-9-a7919700de86@kernel.org>
Date: Mon, 02 Jun 2025 10:01:52 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 Chuck Lever <chuck.lever@...cle.com>, 
 Alexander Aring <alex.aring@...il.com>, 
 Trond Myklebust <trondmy@...nel.org>, Anna Schumaker <anna@...nel.org>, 
 Steve French <sfrench@...ba.org>, Paulo Alcantara <pc@...guebit.com>, 
 Ronnie Sahlberg <ronniesahlberg@...il.com>, 
 Shyam Prasad N <sprasad@...rosoft.com>, Tom Talpey <tom@...pey.com>, 
 Bharath SM <bharathsm@...rosoft.com>, NeilBrown <neil@...wn.name>, 
 Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
 Jonathan Corbet <corbet@....net>, Amir Goldstein <amir73il@...il.com>, 
 Miklos Szeredi <miklos@...redi.hu>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org, 
 samba-technical@...ts.samba.org, linux-doc@...r.kernel.org, 
 Jeff Layton <jlayton@...nel.org>
Subject: [PATCH RFC v2 09/28] filelock: lift the ban on directory leases in
 generic_setlease

With the addition of the try_break_lease calls in directory changing
operations, allow generic_setlease to hand them out.

Note that this also makes directory leases available to userland via
fcntl(). I don't see a real reason to prevent userland from acquiring
one, but we could reinstate the prohibition if that's preferable.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/locks.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/locks.c b/fs/locks.c
index 1985f38d326d938f58009e0880b45e588af6a422..82a1b528dc9dae8c1f3a81084072e649d481e8f1 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1934,7 +1934,9 @@ static int generic_delete_lease(struct file *filp, void *owner)
 int generic_setlease(struct file *filp, int arg, struct file_lease **flp,
 			void **priv)
 {
-	if (!S_ISREG(file_inode(filp)->i_mode))
+	struct inode *inode = file_inode(filp);
+
+	if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
 		return -EINVAL;
 
 	switch (arg) {

-- 
2.49.0