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NFSD: Get response size before operation for all RPCs
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NFSD usess PAGE_SIZE as the reply size estimate for RPCs which don't
support op_rsize_bop(), A PAGE_SIZE (4096) is larger than many real
response sizes, eg, access (op_encode_hdr_size + 2), seek
(op_encode_hdr_size + 3).

This patch just adds op_rsize_bop() for all RPCs getting response size.

An overestimate is generally safe but the tighter estimates are probably
better.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Kinglong Mee authored and J. Bruce Fields committed Feb 17, 2017
1 parent 8274338 commit 2282cd2
Showing 1 changed file with 63 additions and 6 deletions.
69 changes: 63 additions & 6 deletions fs/nfsd/nfs4proc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1842,6 +1842,12 @@ static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd
return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
}

static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
/* ac_supported, ac_resp_access */
return (op_encode_hdr_size + 2)* sizeof(__be32);
}

static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
Expand Down Expand Up @@ -1896,6 +1902,11 @@ static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
return ret;
}

static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
}

static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + op_encode_change_info_maxsz)
Expand Down Expand Up @@ -1937,6 +1948,11 @@ static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *o
XDR_QUADLEN(rlen)) * sizeof(__be32);
}

static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
}

static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + op_encode_change_info_maxsz)
Expand All @@ -1956,11 +1972,23 @@ static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
}

static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
* sizeof(__be32);
}

static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
}

static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
(4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
}

static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
Expand Down Expand Up @@ -2015,6 +2043,19 @@ static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
}

#ifdef CONFIG_NFSD_PNFS
static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
u32 maxcount = 0, rlen = 0;

maxcount = svc_max_payload(rqstp);
rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);

return (op_encode_hdr_size +
1 /* gd_layout_type*/ +
XDR_QUADLEN(rlen) +
2 /* gd_notify_types */) * sizeof(__be32);
}

/*
* At this stage we don't really know what layout driver will handle the request,
* so we need to define an arbitrary upper bound here.
Expand Down Expand Up @@ -2044,10 +2085,17 @@ static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_
}
#endif /* CONFIG_NFSD_PNFS */


static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
return (op_encode_hdr_size + 3) * sizeof(__be32);
}

static struct nfsd4_operation nfsd4_ops[] = {
[OP_ACCESS] = {
.op_func = (nfsd4op_func)nfsd4_access,
.op_name = "OP_ACCESS",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_access_rsize,
},
[OP_CLOSE] = {
.op_func = (nfsd4op_func)nfsd4_close,
Expand Down Expand Up @@ -2085,6 +2133,7 @@ static struct nfsd4_operation nfsd4_ops[] = {
[OP_GETFH] = {
.op_func = (nfsd4op_func)nfsd4_getfh,
.op_name = "OP_GETFH",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_getfh_rsize,
},
[OP_LINK] = {
.op_func = (nfsd4op_func)nfsd4_link,
Expand All @@ -2103,6 +2152,7 @@ static struct nfsd4_operation nfsd4_ops[] = {
[OP_LOCKT] = {
.op_func = (nfsd4op_func)nfsd4_lockt,
.op_name = "OP_LOCKT",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
},
[OP_LOCKU] = {
.op_func = (nfsd4op_func)nfsd4_locku,
Expand All @@ -2115,15 +2165,18 @@ static struct nfsd4_operation nfsd4_ops[] = {
.op_func = (nfsd4op_func)nfsd4_lookup,
.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
.op_name = "OP_LOOKUP",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
},
[OP_LOOKUPP] = {
.op_func = (nfsd4op_func)nfsd4_lookupp,
.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
.op_name = "OP_LOOKUPP",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
},
[OP_NVERIFY] = {
.op_func = (nfsd4op_func)nfsd4_nverify,
.op_name = "OP_NVERIFY",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
},
[OP_OPEN] = {
.op_func = (nfsd4op_func)nfsd4_open,
Expand Down Expand Up @@ -2181,6 +2234,7 @@ static struct nfsd4_operation nfsd4_ops[] = {
[OP_READLINK] = {
.op_func = (nfsd4op_func)nfsd4_readlink,
.op_name = "OP_READLINK",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_readlink_rsize,
},
[OP_REMOVE] = {
.op_func = (nfsd4op_func)nfsd4_remove,
Expand Down Expand Up @@ -2219,6 +2273,7 @@ static struct nfsd4_operation nfsd4_ops[] = {
.op_func = (nfsd4op_func)nfsd4_secinfo,
.op_flags = OP_HANDLES_WRONGSEC,
.op_name = "OP_SECINFO",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_secinfo_rsize,
},
[OP_SETATTR] = {
.op_func = (nfsd4op_func)nfsd4_setattr,
Expand All @@ -2244,6 +2299,7 @@ static struct nfsd4_operation nfsd4_ops[] = {
[OP_VERIFY] = {
.op_func = (nfsd4op_func)nfsd4_verify,
.op_name = "OP_VERIFY",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
},
[OP_WRITE] = {
.op_func = (nfsd4op_func)nfsd4_write,
Expand Down Expand Up @@ -2318,11 +2374,13 @@ static struct nfsd4_operation nfsd4_ops[] = {
.op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
.op_flags = OP_HANDLES_WRONGSEC,
.op_name = "OP_SECINFO_NO_NAME",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_secinfo_rsize,
},
[OP_TEST_STATEID] = {
.op_func = (nfsd4op_func)nfsd4_test_stateid,
.op_flags = ALLOWED_WITHOUT_FH,
.op_name = "OP_TEST_STATEID",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_test_stateid_rsize,
},
[OP_FREE_STATEID] = {
.op_func = (nfsd4op_func)nfsd4_free_stateid,
Expand All @@ -2336,6 +2394,7 @@ static struct nfsd4_operation nfsd4_ops[] = {
.op_func = (nfsd4op_func)nfsd4_getdeviceinfo,
.op_flags = ALLOWED_WITHOUT_FH,
.op_name = "OP_GETDEVICEINFO",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_getdeviceinfo_rsize,
},
[OP_LAYOUTGET] = {
.op_func = (nfsd4op_func)nfsd4_layoutget,
Expand Down Expand Up @@ -2385,6 +2444,7 @@ static struct nfsd4_operation nfsd4_ops[] = {
[OP_SEEK] = {
.op_func = (nfsd4op_func)nfsd4_seek,
.op_name = "OP_SEEK",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_seek_rsize,
},
};

Expand Down Expand Up @@ -2429,14 +2489,11 @@ bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)

int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
struct nfsd4_operation *opdesc;
nfsd4op_rsize estimator;

if (op->opnum == OP_ILLEGAL)
return op_encode_hdr_size * sizeof(__be32);
opdesc = OPDESC(op);
estimator = opdesc->op_rsize_bop;
return estimator ? estimator(rqstp, op) : PAGE_SIZE;

BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
return OPDESC(op)->op_rsize_bop(rqstp, op);
}

void warn_on_nonidempotent_op(struct nfsd4_op *op)
Expand Down

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