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SUNRPC: Introduce rpc_prepare_reply_pages()

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prepare_reply_buffer() and its NFSv4 equivalents expose the details
of the RPC header and the auth slack values to upper layer
consumers, creating a layering violation, and duplicating code.

Remedy these issues by adding a new RPC client API that hides those
details from upper layers in a common helper function.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever
2019-02-11 11:25:20 -05:00
committed by Anna Schumaker
parent 2573a46499
commit cf500bac8f
7 changed files with 102 additions and 73 deletions
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27
fs/nfs/nfs2xdr.c
View File

@@ -65,21 +65,6 @@
static int nfs_stat_to_errno(enum nfs_stat);
/*
* While encoding arguments, set up the reply buffer in advance to
* receive reply data directly into the page cache.
*/
static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
unsigned int base, unsigned int len,
unsigned int bufsize)
{
struct rpc_auth *auth = req->rq_cred->cr_auth;
unsigned int replen;
replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
}
/*
* Encode/decode NFSv2 basic data types
*
@@ -593,8 +578,8 @@ static void nfs2_xdr_enc_readlinkargs(struct rpc_rqst *req,
const struct nfs_readlinkargs *args = data;
encode_fhandle(xdr, args->fh);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->pglen, NFS_readlinkres_sz);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->pglen, NFS_readlinkres_sz);
}
/*
@@ -629,8 +614,8 @@ static void nfs2_xdr_enc_readargs(struct rpc_rqst *req,
const struct nfs_pgio_args *args = data;
encode_readargs(xdr, args);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->count, NFS_readres_sz);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->count, NFS_readres_sz);
req->rq_rcv_buf.flags |= XDRBUF_READ;
}
@@ -787,8 +772,8 @@ static void nfs2_xdr_enc_readdirargs(struct rpc_rqst *req,
const struct nfs_readdirargs *args = data;
encode_readdirargs(xdr, args);
prepare_reply_buffer(req, args->pages, 0,
args->count, NFS_readdirres_sz);
rpc_prepare_reply_pages(req, args->pages, 0,
args->count, NFS_readdirres_sz);
}
/*

29
fs/nfs/nfs3xdr.c
View File

@@ -104,21 +104,6 @@ static const umode_t nfs_type2fmt[] = {
[NF3FIFO] = S_IFIFO,
};
/*
* While encoding arguments, set up the reply buffer in advance to
* receive reply data directly into the page cache.
*/
static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
unsigned int base, unsigned int len,
unsigned int bufsize)
{
struct rpc_auth *auth = req->rq_cred->cr_auth;
unsigned int replen;
replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
}
/*
* Encode/decode NFSv3 basic data types
*
@@ -910,8 +895,8 @@ static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
const struct nfs3_readlinkargs *args = data;
encode_nfs_fh3(xdr, args->fh);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->pglen, NFS3_readlinkres_sz);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->pglen, NFS3_readlinkres_sz);
}
/*
@@ -943,8 +928,8 @@ static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
encode_read3args(xdr, args);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->count, replen);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->count, replen);
req->rq_rcv_buf.flags |= XDRBUF_READ;
}
@@ -1236,7 +1221,7 @@ static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
const struct nfs3_readdirargs *args = data;
encode_readdir3args(xdr, args);
prepare_reply_buffer(req, args->pages, 0,
rpc_prepare_reply_pages(req, args->pages, 0,
args->count, NFS3_readdirres_sz);
}
@@ -1278,7 +1263,7 @@ static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
const struct nfs3_readdirargs *args = data;
encode_readdirplus3args(xdr, args);
prepare_reply_buffer(req, args->pages, 0,
rpc_prepare_reply_pages(req, args->pages, 0,
args->count, NFS3_readdirres_sz);
}
@@ -1323,7 +1308,7 @@ static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
encode_nfs_fh3(xdr, args->fh);
encode_uint32(xdr, args->mask);
if (args->mask & (NFS_ACL | NFS_DFACL)) {
prepare_reply_buffer(req, args->pages, 0,
rpc_prepare_reply_pages(req, args->pages, 0,
NFSACL_MAXPAGES << PAGE_SHIFT,
ACL3_getaclres_sz);
req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;

51
fs/nfs/nfs4xdr.c
View File

@@ -1016,12 +1016,11 @@ static void encode_compound_hdr(struct xdr_stream *xdr,
struct compound_hdr *hdr)
{
__be32 *p;
struct rpc_auth *auth = req->rq_cred->cr_auth;
/* initialize running count of expected bytes in reply.
* NOTE: the replied tag SHOULD be the same is the one sent,
* but this is not required as a MUST for the server to do so. */
hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
hdr->replen = 3 + hdr->taglen;
WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
encode_string(xdr, hdr->taglen, hdr->tag);
@@ -2341,9 +2340,9 @@ static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
if (args->lg_args) {
encode_layoutget(xdr, args->lg_args, &hdr);
xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
args->lg_args->layout.pages,
0, args->lg_args->layout.pglen);
rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
args->lg_args->layout.pglen,
hdr.replen);
}
encode_nops(&hdr);
}
@@ -2387,9 +2386,9 @@ static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
if (args->lg_args) {
encode_layoutget(xdr, args->lg_args, &hdr);
xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
args->lg_args->layout.pages,
0, args->lg_args->layout.pglen);
rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
args->lg_args->layout.pglen,
hdr.replen);
}
encode_nops(&hdr);
}
@@ -2499,8 +2498,8 @@ static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
encode_putfh(xdr, args->fh, &hdr);
encode_readlink(xdr, args, req, &hdr);
xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
args->pgbase, args->pglen);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->pglen, hdr.replen);
encode_nops(&hdr);
}
@@ -2520,11 +2519,8 @@ static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
encode_putfh(xdr, args->fh, &hdr);
encode_readdir(xdr, args, req, &hdr);
xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
args->pgbase, args->count);
dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
__func__, hdr.replen << 2, args->pages,
args->pgbase, args->count);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->count, hdr.replen);
encode_nops(&hdr);
}
@@ -2544,8 +2540,8 @@ static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
encode_putfh(xdr, args->fh, &hdr);
encode_read(xdr, args, &hdr);
xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
args->pages, args->pgbase, args->count);
rpc_prepare_reply_pages(req, args->pages, args->pgbase,
args->count, hdr.replen);
req->rq_rcv_buf.flags |= XDRBUF_READ;
encode_nops(&hdr);
}
@@ -2591,9 +2587,8 @@ static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
encode_getattr(xdr, nfs4_acl_bitmap, NULL,
ARRAY_SIZE(nfs4_acl_bitmap), &hdr);
xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
args->acl_pages, 0, args->acl_len);
rpc_prepare_reply_pages(req, args->acl_pages, 0,
args->acl_len, replen);
encode_nops(&hdr);
}
@@ -2814,9 +2809,8 @@ static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
encode_fs_locations(xdr, args->bitmask, &hdr);
}
/* Set up reply kvec to capture returned fs_locations array. */
xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
(struct page **)&args->page, 0, PAGE_SIZE);
rpc_prepare_reply_pages(req, (struct page **)&args->page, 0,
PAGE_SIZE, replen);
encode_nops(&hdr);
}
@@ -3018,10 +3012,8 @@ static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
/* set up reply kvec. Subtract notification bitmap max size (2)
* so that notification bitmap is put in xdr_buf tail */
xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
args->pdev->pages, args->pdev->pgbase,
args->pdev->pglen);
rpc_prepare_reply_pages(req, args->pdev->pages, args->pdev->pgbase,
args->pdev->pglen, hdr.replen - 2);
encode_nops(&hdr);
}
@@ -3042,9 +3034,8 @@ static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
encode_putfh(xdr, NFS_FH(args->inode), &hdr);
encode_layoutget(xdr, args, &hdr);
xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
args->layout.pages, 0, args->layout.pglen);
rpc_prepare_reply_pages(req, args->layout.pages, 0,
args->layout.pglen, hdr.replen);
encode_nops(&hdr);
}