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Message-Id: <20250602-dir-deleg-v2-13-a7919700de86@kernel.org>
Date: Mon, 02 Jun 2025 10:01:56 -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 13/28] nfsd: wire up GET_DIR_DELEGATION handling
Add a new routine for acquiring a read delegation on a directory. Since
the same CB_RECALL/DELEGRETURN infrastrure is used for regular and
directory delegations, we can just use a normal nfs4_delegation to
represent it.
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
fs/nfsd/nfs4proc.c | 21 +++++++++++++-
fs/nfsd/nfs4state.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nfsd/state.h | 5 ++++
3 files changed, 107 insertions(+), 1 deletion(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index f13abbb13b388d223165b1168dc2c07eafb259cb..fa6f2980bcacd798c41387c71d55a59fdbc8043c 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -2298,6 +2298,13 @@ nfsd4_get_dir_delegation(struct svc_rqst *rqstp,
union nfsd4_op_u *u)
{
struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation;
+ struct nfs4_delegation *dd;
+ struct nfsd_file *nf;
+ __be32 status;
+
+ status = nfsd_file_acquire_dir(rqstp, &cstate->current_fh, &nf);
+ if (status != nfs_ok)
+ return status;
/*
* RFC 8881, section 18.39.3 says:
@@ -2311,7 +2318,19 @@ nfsd4_get_dir_delegation(struct svc_rqst *rqstp,
* return NFS4_OK with a non-fatal status of GDD4_UNAVAIL in this
* situation.
*/
- gdd->gddrnf_status = GDD4_UNAVAIL;
+ dd = nfsd_get_dir_deleg(cstate, gdd, nf);
+ if (IS_ERR(dd)) {
+ int err = PTR_ERR(dd);
+
+ if (err != -EAGAIN)
+ return nfserrno(err);
+ gdd->gddrnf_status = GDD4_UNAVAIL;
+ return nfs_ok;
+ }
+
+ gdd->gddrnf_status = GDD4_OK;
+ memcpy(&gdd->gddr_stateid, &dd->dl_stid.sc_stateid, sizeof(gdd->gddr_stateid));
+ nfs4_put_stid(&dd->dl_stid);
return nfs_ok;
}
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 12f20e3c9c54b68cdd4c62aa2904c22c9ccfae0a..ed5d6486d171ea0c886bd1f1ea1129bf4ccf429c 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -9307,3 +9307,85 @@ nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct dentry *dentry,
nfs4_put_stid(&dp->dl_stid);
return status;
}
+
+/**
+ * nfsd_get_dir_deleg - attempt to get a directory delegation
+ * @cstate: compound state
+ * @gdd: GET_DIR_DELEGATION arg/resp structure
+ * @nf: nfsd_file opened on the directory
+ *
+ * Given a GET_DIR_DELEGATION request @gdd, attempt to acquire a delegation
+ * on the directory to which @nf refers. Note that this does not set up any
+ * sort of async notifications for the delegation.
+ */
+struct nfs4_delegation *
+nfsd_get_dir_deleg(struct nfsd4_compound_state *cstate,
+ struct nfsd4_get_dir_delegation *gdd,
+ struct nfsd_file *nf)
+{
+ struct nfs4_client *clp = cstate->clp;
+ struct nfs4_delegation *dp;
+ struct file_lease *fl;
+ struct nfs4_file *fp;
+ int status = 0;
+
+ fp = nfsd4_alloc_file();
+ if (!fp)
+ return ERR_PTR(-ENOMEM);
+
+ nfsd4_file_init(&cstate->current_fh, fp);
+ fp->fi_deleg_file = nf;
+ fp->fi_delegees = 1;
+
+ /* if this client already has one, return that it's unavailable */
+ spin_lock(&state_lock);
+ spin_lock(&fp->fi_lock);
+ if (nfs4_delegation_exists(clp, fp))
+ status = -EAGAIN;
+ spin_unlock(&fp->fi_lock);
+ spin_unlock(&state_lock);
+
+ if (status)
+ goto out_delegees;
+
+ /* Try to set up the lease */
+ status = -ENOMEM;
+ dp = alloc_init_deleg(clp, fp, NULL, NFS4_OPEN_DELEGATE_READ);
+ if (!dp)
+ goto out_delegees;
+
+ fl = nfs4_alloc_init_lease(dp);
+ if (!fl)
+ goto out_put_stid;
+
+ status = kernel_setlease(nf->nf_file,
+ fl->c.flc_type, &fl, NULL);
+ if (fl)
+ locks_free_lease(fl);
+ if (status)
+ goto out_put_stid;
+
+ /*
+ * Now, try to hash it. This can fail if we race another nfsd task
+ * trying to set a delegation on the same file. If that happens,
+ * then just say UNAVAIL.
+ */
+ spin_lock(&state_lock);
+ spin_lock(&clp->cl_lock);
+ spin_lock(&fp->fi_lock);
+ status = hash_delegation_locked(dp, fp);
+ spin_unlock(&fp->fi_lock);
+ spin_unlock(&clp->cl_lock);
+ spin_unlock(&state_lock);
+
+ if (!status)
+ 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);
+out_put_stid:
+ nfs4_put_stid(&dp->dl_stid);
+out_delegees:
+ put_deleg_file(fp);
+ return ERR_PTR(status);
+}
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 8adc2550129e67a4e6646395fa2811e1c2acb98e..0eeecd824770c4df8e1cc29fc738e568d91d5e5f 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -855,4 +855,9 @@ static inline bool try_to_expire_client(struct nfs4_client *clp)
extern __be32 nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp,
struct dentry *dentry, struct nfs4_delegation **pdp);
+
+struct nfsd4_get_dir_delegation;
+struct nfs4_delegation *nfsd_get_dir_deleg(struct nfsd4_compound_state *cstate,
+ struct nfsd4_get_dir_delegation *gdd,
+ struct nfsd_file *nf);
#endif /* NFSD4_STATE_H */
--
2.49.0
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