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NFSD: Implement FATTR4_CLONE_BLKSIZE attribute

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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>
This commit is contained in:
Chuck Lever
2025-05-07 10:45:15 -04:00
parent c2c90a8b26
commit d6ca7d2643
1 changed files with 18 additions and 1 deletions
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19
fs/nfsd/nfs4xdr.c
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@@ -3391,6 +3391,23 @@ 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)
@@ -3545,7 +3562,7 @@ 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,