diff options
| author | Chuck Lever <chuck.lever@oracle.com> | 2025-05-07 10:45:15 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-06-27 11:11:15 +0100 |
| commit | 07862d4f7c357697f5af7d557d8a6707608f419e (patch) | |
| tree | 435395c7527706b6f5be61b777f2e1b03a2aec5a | |
| parent | 2029ca75cdfa6a25716a5a76b751486cce7e3822 (diff) | |
NFSD: Implement FATTR4_CLONE_BLKSIZE attribute
commit d6ca7d2643eebe09cf46840bdc7d68b6e07aba77 upstream.
RFC 7862 states that if an NFS server implements a CLONE operation,
it MUST also implement FATTR4_CLONE_BLKSIZE. NFSD implements CLONE,
but does not implement FATTR4_CLONE_BLKSIZE.
Note that in Section 12.2, RFC 7862 claims that
FATTR4_CLONE_BLKSIZE is RECOMMENDED, not REQUIRED. Likely this is
because a minor version is not permitted to add a REQUIRED
attribute. Confusing.
We assume this attribute reports a block size as a count of bytes,
as RFC 7862 does not specify a unit.
Reported-by: Roland Mainz <roland.mainz@nrubsig.org>
Suggested-by: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Roland Mainz <roland.mainz@nrubsig.org>
Cc: stable@vger.kernel.org # v6.7+
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/nfsd/nfs4xdr.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 2fc1919dd3c0..6edeb3bdf81b 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -3382,6 +3382,23 @@ static __be32 nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream *xdr, return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]); } +/* + * Copied from generic_remap_checks/generic_remap_file_range_prep. + * + * These generic functions use the file system's s_blocksize, but + * individual file systems aren't required to use + * generic_remap_file_range_prep. Until there is a mechanism for + * determining a particular file system's (or file's) clone block + * size, this is the best NFSD can do. + */ +static __be32 nfsd4_encode_fattr4_clone_blksize(struct xdr_stream *xdr, + const struct nfsd4_fattr_args *args) +{ + struct inode *inode = d_inode(args->dentry); + + return nfsd4_encode_uint32_t(xdr, inode->i_sb->s_blocksize); +} + #ifdef CONFIG_NFSD_V4_SECURITY_LABEL static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr, const struct nfsd4_fattr_args *args) @@ -3487,7 +3504,7 @@ static const nfsd4_enc_attr nfsd4_enc_fattr4_encode_ops[] = { [FATTR4_MODE_SET_MASKED] = nfsd4_encode_fattr4__noop, [FATTR4_SUPPATTR_EXCLCREAT] = nfsd4_encode_fattr4_suppattr_exclcreat, [FATTR4_FS_CHARSET_CAP] = nfsd4_encode_fattr4__noop, - [FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4__noop, + [FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4_clone_blksize, [FATTR4_SPACE_FREED] = nfsd4_encode_fattr4__noop, [FATTR4_CHANGE_ATTR_TYPE] = nfsd4_encode_fattr4__noop, |