nfsd4: tweak nfsd4_encode_getattr to take xdr_stream

[firefly-linux-kernel-4.4.55.git] / fs / nfsd / nfs4xdr.c

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 911372590ae140abd05cc8de3bf0aabbb4fd408b..187925065d162933e3abbb5c45a63dcc36118b27 100644 (file)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2045,12 +2045,11 @@ static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
 /*
  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
  * ourselves.
- *
- * countp is the buffer size in _words_
  */
 __be32
-nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
-               struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
+nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
+               struct svc_export *exp,
+               struct dentry *dentry, u32 *bmval,
                struct svc_rqst *rqstp, int ignore_crossmnt)
 {
        u32 bmval0 = bmval[0];
@@ -2059,12 +2058,12 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
        struct kstat stat;
        struct svc_fh *tempfh = NULL;
        struct kstatfs statfs;
-       int buflen = count << 2;
+       __be32 *p = xdr->p;
+       int buflen = xdr->buf->buflen;
        __be32 *attrlenp;
        u32 dummy;
        u64 dummy64;
        u32 rdattr_err = 0;
-       __be32 *p = *buffer;
        __be32 status;
        int err;
        int aclsupport = 0;
@@ -2491,7 +2490,7 @@ out_acl:
        }
 
        *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
-       *buffer = p;
+       xdr->p = p;
        status = nfs_ok;
 
 out:
@@ -2513,6 +2512,27 @@ out_resource:
        goto out;
 }
 
+__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
+                       struct svc_fh *fhp, struct svc_export *exp,
+                       struct dentry *dentry, u32 *bmval,
+                       struct svc_rqst *rqstp, int ignore_crossmnt)
+{
+       struct xdr_buf dummy = {
+                       .head[0] = {
+                               .iov_base = *p,
+                       },
+                       .buflen = words << 2,
+               };
+       struct xdr_stream xdr;
+       __be32 ret;
+
+       xdr_init_encode(&xdr, &dummy, NULL);
+       ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
+                                                       ignore_crossmnt);
+       *p = xdr.p;
+       return ret;
+}
+
 static inline int attributes_need_mount(u32 *bmval)
 {
        if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
@@ -2576,7 +2596,8 @@ nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
 
        }
 out_encode:
-       nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
+       nfserr = nfsd4_encode_fattr_to_buf(p, buflen, NULL, exp, dentry,
+                                       cd->rd_bmval,
                                        cd->rd_rqstp, ignore_crossmnt);
 out_put:
        dput(dentry);
@@ -2746,14 +2767,16 @@ static __be32
 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
 {
        struct svc_fh *fhp = getattr->ga_fhp;
-       int buflen;
+       struct xdr_stream *xdr = &resp->xdr;
+       struct xdr_buf *buf = resp->xdr.buf;
 
        if (nfserr)
                return nfserr;
 
-       buflen = resp->xdr.end - resp->xdr.p - (COMPOUND_ERR_SLACK_SPACE >> 2);
-       nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
-                                   &resp->xdr.p, buflen, getattr->ga_bmval,
+       buf->buflen = (void *)resp->xdr.end - (void *)resp->xdr.p
+                       - COMPOUND_ERR_SLACK_SPACE;
+       nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
+                                   getattr->ga_bmval,
                                    resp->rqstp, 0);
        return nfserr;
 }