[PATCH v1 24/42] NFSD: Update the NFSv2 READLINK argument decoder to use struct xdr_stream

Chuck Lever
2021-01-05T15:32:18Z

If the code that sets up the sink buffer for nfsd_readlink() is
moved adjacent to the nfsd_readlink() call site that uses it, then
the only argument is a file handle, and the fhandle decoder can be
used instead.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
fs/nfsd/nfsproc.c | 9 +++++----
fs/nfsd/nfsxdr.c | 13 -------------
fs/nfsd/xdr.h | 6 ------
3 files changed, 5 insertions(+), 23 deletions(-)

diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index 814762793f9c..bdb47848f7fd 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -149,14 +149,15 @@ nfsd_proc_lookup(struct svc_rqst *rqstp)
static __be32
nfsd_proc_readlink(struct svc_rqst *rqstp)
{
- struct nfsd_readlinkargs *argp = rqstp->rq_argp;
+ struct nfsd_fhandle *argp = rqstp->rq_argp;
struct nfsd_readlinkres *resp = rqstp->rq_resp;
+ char *buffer = page_address(*(rqstp->rq_next_page++));

dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));

/* Read the symlink. */
resp->len = NFS_MAXPATHLEN;
- resp->status = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
+ resp->status = nfsd_readlink(rqstp, &argp->fh, buffer, &resp->len);

fh_put(&argp->fh);
return rpc_success;
@@ -674,9 +675,9 @@ static const struct svc_procedure nfsd_procedures2[18] = {
},
[NFSPROC_READLINK] = {
.pc_func = nfsd_proc_readlink,
- .pc_decode = nfssvc_decode_readlinkargs,
+ .pc_decode = nfssvc_decode_fhandleargs,
.pc_encode = nfssvc_encode_readlinkres,
- .pc_argsize = sizeof(struct nfsd_readlinkargs),
+ .pc_argsize = sizeof(struct nfsd_fhandle),
.pc_ressize = sizeof(struct nfsd_readlinkres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index 11d27b219cff..02dd9888d93b 100644
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -326,19 +326,6 @@ nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
return xdr_argsize_check(rqstp, p);
}

-int
-nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
-{
- struct nfsd_readlinkargs *args = rqstp->rq_argp;
-
- p = decode_fh(p, &args->fh);
- if (!p)
- return 0;
- args->buffer = page_address(*(rqstp->rq_next_page++));
-
- return xdr_argsize_check(rqstp, p);
-}
-
int
nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
{
diff --git a/fs/nfsd/xdr.h b/fs/nfsd/xdr.h
index d2ffda96975d..288c29a999db 100644
--- a/fs/nfsd/xdr.h
+++ b/fs/nfsd/xdr.h
@@ -52,11 +52,6 @@ struct nfsd_renameargs {
unsigned int tlen;
};

-struct nfsd_readlinkargs {
- struct svc_fh fh;
- char * buffer;
-};
-
struct nfsd_linkargs {
struct svc_fh ffh;
struct svc_fh tfh;
@@ -150,7 +145,6 @@ int nfssvc_decode_readargs(struct svc_rqst *, __be32 *);
int nfssvc_decode_writeargs(struct svc_rqst *, __be32 *);
int nfssvc_decode_createargs(struct svc_rqst *, __be32 *);
int nfssvc_decode_renameargs(struct svc_rqst *, __be32 *);
-int nfssvc_decode_readlinkargs(struct svc_rqst *, __be32 *);
int nfssvc_decode_linkargs(struct svc_rqst *, __be32 *);
int nfssvc_decode_symlinkargs(struct svc_rqst *, __be32 *);
int nfssvc_decode_readdirargs(struct svc_rqst *, __be32 *);