[PATCH v3 33/38] nfsd: allow encoding a filehandle into fattr4 without a svc_fh
From: Jeff Layton <jlayton@kernel.org>
Date: 2025-09-24 18:08:09
Also in:
linux-cifs, linux-doc, linux-fsdevel, linux-nfs, linux-unionfs, linux-xfs, lkml, netfs
Subsystem:
filesystems (vfs and infrastructure), kernel nfsd, sunrpc, and lockd servers, the rest · Maintainers:
Alexander Viro, Christian Brauner, Chuck Lever, Jeff Layton, Linus Torvalds
The current fattr4 encoder requires a svc_fh in order to encode the filehandle. This is not available in a CB_NOTIFY callback. Add a a new "fhandle" field to struct nfsd4_fattr_args and copy the filehandle into there from the svc_fh. CB_NOTIFY will populate it via other means. Signed-off-by: Jeff Layton <jlayton@kernel.org> --- fs/nfsd/nfs4xdr.c | 35 ++++++++++++++++++++--------------- 1 file changed, 20 insertions(+), 15 deletions(-)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 1db2bd974bfa9d899f590f4b4e869115ab73aff6..822a9d47dd88df579e4f57f04dd6737653f71c94 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c@@ -2561,7 +2561,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp) } static __be32 nfsd4_encode_nfs_fh4(struct xdr_stream *xdr, - struct knfsd_fh *fh_handle) + const struct knfsd_fh *fh_handle) { return nfsd4_encode_opaque(xdr, fh_handle->fh_raw, fh_handle->fh_size); }
@@ -2924,6 +2924,7 @@ struct nfsd4_fattr_args { struct svc_fh *fhp; struct svc_export *exp; struct dentry *dentry; + struct knfsd_fh fhandle; struct kstat stat; struct kstatfs statfs; struct nfs4_acl *acl;
@@ -3129,7 +3130,7 @@ static __be32 nfsd4_encode_fattr4_acl(struct xdr_stream *xdr, static __be32 nfsd4_encode_fattr4_filehandle(struct xdr_stream *xdr, const struct nfsd4_fattr_args *args) { - return nfsd4_encode_nfs_fh4(xdr, &args->fhp->fh_handle); + return nfsd4_encode_nfs_fh4(xdr, &args->fhandle); } static __be32 nfsd4_encode_fattr4_fileid(struct xdr_stream *xdr,
@@ -3678,19 +3679,23 @@ nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr, if (err) goto out_nfserr; } - if ((attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && - !fhp) { - tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); - status = nfserr_jukebox; - if (!tempfh) - goto out; - fh_init(tempfh, NFS4_FHSIZE); - status = fh_compose(tempfh, exp, dentry, NULL); - if (status) - goto out; - args.fhp = tempfh; - } else - args.fhp = fhp; + + args.fhp = fhp; + if ((attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID))) { + if (!args.fhp) { + tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); + status = nfserr_jukebox; + if (!tempfh) + goto out; + fh_init(tempfh, NFS4_FHSIZE); + status = fh_compose(tempfh, exp, dentry, NULL); + if (status) + goto out; + args.fhp = tempfh; + } + if (args.fhp) + fh_copy_shallow(&args.fhandle, &args.fhp->fh_handle); + } if (attrmask[0] & FATTR4_WORD0_ACL) { err = nfsd4_get_nfs4_acl(rqstp, dentry, &args.acl);
--
2.51.0