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NFSD: Update the MKNOD3args decoder to use struct xdr_stream 

This commit removes the last usage of the original decode_sattr3(),
so it is removed as a clean-up.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-10-20 17:04:03 -04:00
parent da39201637
commit f8a38e2d6c
1 changed files with 35 additions and 72 deletions
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107
fs/nfsd/nfs3xdr.c
View File

@ -103,26 +103,6 @@ encode_fh(__be32 *p, struct svc_fh *fhp)
return p + XDR_QUADLEN(size);
}
/*
* Decode a file name and make sure that the path contains
* no slashes or null bytes.
*/
static __be32 *
decode_filename(__be32 *p, char **namp, unsigned int *lenp)
{
char *name;
unsigned int i;
if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
for (i = 0, name = *namp; i < *lenp; i++, name++) {
if (*name == '\0' || *name == '/')
return NULL;
}
}
return p;
}
static bool
svcxdr_decode_filename3(struct xdr_stream *xdr, char **name, unsigned int *len)
{
@ -262,49 +242,26 @@ svcxdr_decode_sattrguard3(struct xdr_stream *xdr, struct nfsd3_sattrargs *args)
return true;
}
static __be32 *
decode_sattr3(__be32 *p, struct iattr *iap, struct user_namespace *userns)
static bool
svcxdr_decode_specdata3(struct xdr_stream *xdr, struct nfsd3_mknodargs *args)
{
u32 tmp;
__be32 *p;
iap->ia_valid = 0;
p = xdr_inline_decode(xdr, XDR_UNIT * 2);
if (!p)
return false;
args->major = be32_to_cpup(p++);
args->minor = be32_to_cpup(p);
if (*p++) {
iap->ia_valid |= ATTR_MODE;
iap->ia_mode = ntohl(*p++);
}
if (*p++) {
iap->ia_uid = make_kuid(userns, ntohl(*p++));
if (uid_valid(iap->ia_uid))
iap->ia_valid |= ATTR_UID;
}
if (*p++) {
iap->ia_gid = make_kgid(userns, ntohl(*p++));
if (gid_valid(iap->ia_gid))
iap->ia_valid |= ATTR_GID;
}
if (*p++) {
u64 newsize;
return true;
}
iap->ia_valid |= ATTR_SIZE;
p = xdr_decode_hyper(p, &newsize);
iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX);
}
if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
iap->ia_valid |= ATTR_ATIME;
} else if (tmp == 2) { /* set to client time */
iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
iap->ia_atime.tv_sec = ntohl(*p++);
iap->ia_atime.tv_nsec = ntohl(*p++);
}
if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
iap->ia_valid |= ATTR_MTIME;
} else if (tmp == 2) { /* set to client time */
iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
iap->ia_mtime.tv_sec = ntohl(*p++);
iap->ia_mtime.tv_nsec = ntohl(*p++);
}
return p;
static bool
svcxdr_decode_devicedata3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
struct nfsd3_mknodargs *args)
{
return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) &&
svcxdr_decode_specdata3(xdr, args);
}
static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
@ -644,24 +601,30 @@ nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
int
nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd3_mknodargs *args = rqstp->rq_argp;
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_filename(p, &args->name, &args->len)))
if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
return 0;
if (xdr_stream_decode_u32(xdr, &args->ftype) < 0)
return 0;
switch (args->ftype) {
case NF3CHR:
case NF3BLK:
return svcxdr_decode_devicedata3(rqstp, xdr, args);
case NF3SOCK:
case NF3FIFO:
return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
case NF3REG:
case NF3DIR:
case NF3LNK:
/* Valid XDR but illegal file types */
break;
default:
return 0;
args->ftype = ntohl(*p++);
if (args->ftype == NF3BLK || args->ftype == NF3CHR
|| args->ftype == NF3SOCK || args->ftype == NF3FIFO)
p = decode_sattr3(p, &args->attrs, nfsd_user_namespace(rqstp));
if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
args->major = ntohl(*p++);
args->minor = ntohl(*p++);
}
return xdr_argsize_check(rqstp, p);
return 1;
}
int