linux-kernel - [PATCH RFC v2 22/28] nfsd: update the fsnotify mark when setting or removing a dir delegation

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Message-Id: <20250602-dir-deleg-v2-22-a7919700de86@kernel.org>
Date: Mon, 02 Jun 2025 10:02:05 -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 22/28] nfsd: update the fsnotify mark when setting
 or removing a dir delegation

Add a new helper function that will update the mask on the nfsd_file's
fsnotify_mark to be a union of all current directory delegations on an
inode. Call that when directory delegations are added or removed.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/nfs4state.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index ebebfd6d304627d6c82bae5b84ea6c599d9e9474..164020a01b737f76d2780b30274e75dcc3def819 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1302,6 +1302,37 @@ static void put_deleg_file(struct nfs4_file *fp)
 		nfs4_file_put_access(fp, NFS4_SHARE_ACCESS_READ);
 }
 
+static void nfsd_fsnotify_recalc_mask(struct nfsd_file *nf)
+{
+	struct fsnotify_mark *fsn_mark = &nf->nf_mark->nfm_mark;
+	struct inode *inode = file_inode(nf->nf_file);
+	u32 lease_mask, mask = 0;
+	bool recalc = false;
+
+	/* This is only needed when adding or removing dir delegs */
+	if (!S_ISDIR(inode->i_mode))
+		return;
+
+	/* Set up notifications for any ignored delegation events */
+	lease_mask = inode_lease_ignore_mask(inode);
+	if (lease_mask & FL_IGN_DIR_CREATE)
+		mask |= FS_CREATE;
+	if (lease_mask & FL_IGN_DIR_DELETE)
+		mask |= FS_DELETE;
+	if (lease_mask & FL_IGN_DIR_RENAME)
+		mask |= FS_RENAME;
+
+	spin_lock(&fsn_mark->lock);
+	if (fsn_mark->mask != mask) {
+		fsn_mark->mask = mask;
+		recalc = true;
+	}
+	spin_unlock(&fsn_mark->lock);
+
+	if (recalc)
+		fsnotify_recalc_mask(fsn_mark->connector);
+}
+
 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
 {
 	struct nfs4_file *fp = dp->dl_stid.sc_file;
@@ -1309,6 +1340,7 @@ static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
 
 	WARN_ON_ONCE(!fp->fi_delegees);
 
+	nfsd_fsnotify_recalc_mask(nf);
 	kernel_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
 	put_deleg_file(fp);
 }
@@ -9487,8 +9519,10 @@ nfsd_get_dir_deleg(struct nfsd4_compound_state *cstate,
 	spin_unlock(&clp->cl_lock);
 	spin_unlock(&state_lock);
 
-	if (!status)
+	if (!status) {
+		nfsd_fsnotify_recalc_mask(nf);
 		return dp;
+	}
 
 	/* Something failed. Drop the lease and clean up the stid */
 	kernel_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);

-- 
2.49.0