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NFSD: add support for CB_GETATTR callback

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Includes:
   . CB_GETATTR proc for nfs4_cb_procedures[]
   . XDR encoding and decoding function for CB_GETATTR request/reply
   . add nfs4_cb_fattr to nfs4_delegation for sending CB_GETATTR
     and store file attributes from client's reply.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Dai Ngo 2023-09-13 16:38:20 -07:00 committed by Chuck Lever
parent 15d39883ee
commit 738401a9bd
3 changed files with 128 additions and 1 deletions
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97
fs/nfsd/nfs4callback.c
View File

@ -84,7 +84,21 @@ static void encode_uint32(struct xdr_stream *xdr, u32 n)
static void encode_bitmap4(struct xdr_stream *xdr, const __u32 *bitmap,
size_t len)
{
WARN_ON_ONCE(xdr_stream_encode_uint32_array(xdr, bitmap, len) < 0);
xdr_stream_encode_uint32_array(xdr, bitmap, len);
}
static int decode_cb_fattr4(struct xdr_stream *xdr, uint32_t *bitmap,
struct nfs4_cb_fattr *fattr)
{
fattr->ncf_cb_change = 0;
fattr->ncf_cb_fsize = 0;
if (bitmap[0] & FATTR4_WORD0_CHANGE)
if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_change) < 0)
return -NFSERR_BAD_XDR;
if (bitmap[0] & FATTR4_WORD0_SIZE)
if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_fsize) < 0)
return -NFSERR_BAD_XDR;
return 0;
}
/*
@ -357,6 +371,30 @@ encode_cb_recallany4args(struct xdr_stream *xdr,
hdr->nops++;
}
/*
* CB_GETATTR4args
* struct CB_GETATTR4args {
* nfs_fh4 fh;
* bitmap4 attr_request;
* };
*
* The size and change attributes are the only one
* guaranteed to be serviced by the client.
*/
static void
encode_cb_getattr4args(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr,
struct nfs4_cb_fattr *fattr)
{
struct nfs4_delegation *dp =
container_of(fattr, struct nfs4_delegation, dl_cb_fattr);
struct knfsd_fh *fh = &dp->dl_stid.sc_file->fi_fhandle;
encode_nfs_cb_opnum4(xdr, OP_CB_GETATTR);
encode_nfs_fh4(xdr, fh);
encode_bitmap4(xdr, fattr->ncf_cb_bmap, ARRAY_SIZE(fattr->ncf_cb_bmap));
hdr->nops++;
}
/*
* CB_SEQUENCE4args
*
@ -492,6 +530,26 @@ static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
xdr_reserve_space(xdr, 0);
}
/*
* 20.1. Operation 3: CB_GETATTR - Get Attributes
*/
static void nfs4_xdr_enc_cb_getattr(struct rpc_rqst *req,
struct xdr_stream *xdr, const void *data)
{
const struct nfsd4_callback *cb = data;
struct nfs4_cb_fattr *ncf =
container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
struct nfs4_cb_compound_hdr hdr = {
.ident = cb->cb_clp->cl_cb_ident,
.minorversion = cb->cb_clp->cl_minorversion,
};
encode_cb_compound4args(xdr, &hdr);
encode_cb_sequence4args(xdr, cb, &hdr);
encode_cb_getattr4args(xdr, &hdr, ncf);
encode_cb_nops(&hdr);
}
/*
* 20.2. Operation 4: CB_RECALL - Recall a Delegation
*/
@ -547,6 +605,42 @@ static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
return 0;
}
/*
* 20.1. Operation 3: CB_GETATTR - Get Attributes
*/
static int nfs4_xdr_dec_cb_getattr(struct rpc_rqst *rqstp,
struct xdr_stream *xdr,
void *data)
{
struct nfsd4_callback *cb = data;
struct nfs4_cb_compound_hdr hdr;
int status;
u32 bitmap[3] = {0};
u32 attrlen;
struct nfs4_cb_fattr *ncf =
container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
status = decode_cb_compound4res(xdr, &hdr);
if (unlikely(status))
return status;
status = decode_cb_sequence4res(xdr, cb);
if (unlikely(status || cb->cb_seq_status))
return status;
status = decode_cb_op_status(xdr, OP_CB_GETATTR, &cb->cb_status);
if (status)
return status;
if (xdr_stream_decode_uint32_array(xdr, bitmap, 3) < 0)
return -NFSERR_BAD_XDR;
if (xdr_stream_decode_u32(xdr, &attrlen) < 0)
return -NFSERR_BAD_XDR;
if (attrlen > (sizeof(ncf->ncf_cb_change) + sizeof(ncf->ncf_cb_fsize)))
return -NFSERR_BAD_XDR;
status = decode_cb_fattr4(xdr, bitmap, ncf);
return status;
}
/*
* 20.2. Operation 4: CB_RECALL - Recall a Delegation
*/
@ -855,6 +949,7 @@ static const struct rpc_procinfo nfs4_cb_procedures[] = {
PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock),
PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload),
PROC(CB_RECALL_ANY, COMPOUND, cb_recall_any, cb_recall_any),
PROC(CB_GETATTR, COMPOUND, cb_getattr, cb_getattr),
};
static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)];

14
fs/nfsd/state.h
View File

@ -117,6 +117,16 @@ struct nfs4_cpntf_state {
time64_t cpntf_time; /* last time stateid used */
};
struct nfs4_cb_fattr {
struct nfsd4_callback ncf_getattr;
u32 ncf_cb_status;
u32 ncf_cb_bmap[1];
/* from CB_GETATTR reply */
u64 ncf_cb_change;
u64 ncf_cb_fsize;
};
/*
* Represents a delegation stateid. The nfs4_client holds references to these
* and they are put when it is being destroyed or when the delegation is
@ -150,6 +160,9 @@ struct nfs4_delegation {
int dl_retries;
struct nfsd4_callback dl_recall;
bool dl_recalled;
/* for CB_GETATTR */
struct nfs4_cb_fattr dl_cb_fattr;
};
#define cb_to_delegation(cb) \
@ -642,6 +655,7 @@ enum nfsd4_cb_op {
NFSPROC4_CLNT_CB_SEQUENCE,
NFSPROC4_CLNT_CB_NOTIFY_LOCK,
NFSPROC4_CLNT_CB_RECALL_ANY,
NFSPROC4_CLNT_CB_GETATTR,
};
/* Returns true iff a is later than b: */

18
fs/nfsd/xdr4cb.h
View File

@ -54,3 +54,21 @@
#define NFS4_dec_cb_recall_any_sz (cb_compound_dec_hdr_sz + \
cb_sequence_dec_sz + \
op_dec_sz)
/*
* 1: CB_GETATTR opcode (32-bit)
* N: file_handle
* 1: number of entry in attribute array (32-bit)
* 1: entry 0 in attribute array (32-bit)
*/
#define NFS4_enc_cb_getattr_sz (cb_compound_enc_hdr_sz + \
cb_sequence_enc_sz + \
1 + enc_nfs4_fh_sz + 1 + 1)
/*
* 4: fattr_bitmap_maxsz
* 1: attribute array len
* 2: change attr (64-bit)
* 2: size (64-bit)
*/
#define NFS4_dec_cb_getattr_sz (cb_compound_dec_hdr_sz + \
cb_sequence_dec_sz + 4 + 1 + 2 + 2 + op_dec_sz)