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NFSD: Update the NFSv2 SETATTR argument decoder to use struct xdr_stream

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Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-10-21 12:39:06 -04:00
parent 77edcdf91f
commit 2fdd6bd293
1 changed files with 76 additions and 6 deletions
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82
fs/nfsd/nfsxdr.c
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@ -173,6 +173,79 @@ decode_sattr(__be32 *p, struct iattr *iap, struct user_namespace *userns)
return p;
}
static bool
svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
struct iattr *iap)
{
u32 tmp1, tmp2;
__be32 *p;
p = xdr_inline_decode(xdr, XDR_UNIT * 8);
if (!p)
return false;
iap->ia_valid = 0;
/*
* Some Sun clients put 0xffff in the mode field when they
* mean 0xffffffff.
*/
tmp1 = be32_to_cpup(p++);
if (tmp1 != (u32)-1 && tmp1 != 0xffff) {
iap->ia_valid |= ATTR_MODE;
iap->ia_mode = tmp1;
}
tmp1 = be32_to_cpup(p++);
if (tmp1 != (u32)-1) {
iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1);
if (uid_valid(iap->ia_uid))
iap->ia_valid |= ATTR_UID;
}
tmp1 = be32_to_cpup(p++);
if (tmp1 != (u32)-1) {
iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1);
if (gid_valid(iap->ia_gid))
iap->ia_valid |= ATTR_GID;
}
tmp1 = be32_to_cpup(p++);
if (tmp1 != (u32)-1) {
iap->ia_valid |= ATTR_SIZE;
iap->ia_size = tmp1;
}
tmp1 = be32_to_cpup(p++);
tmp2 = be32_to_cpup(p++);
if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
iap->ia_atime.tv_sec = tmp1;
iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;
}
tmp1 = be32_to_cpup(p++);
tmp2 = be32_to_cpup(p++);
if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
iap->ia_mtime.tv_sec = tmp1;
iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC;
/*
* Passing the invalid value useconds=1000000 for mtime
* is a Sun convention for "set both mtime and atime to
* current server time". It's needed to make permissions
* checks for the "touch" program across v2 mounts to
* Solaris and Irix boxes work correctly. See description of
* sattr in section 6.1 of "NFS Illustrated" by
* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
*/
if (tmp2 == 1000000)
iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
}
return true;
}
static __be32 *
encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
struct kstat *stat)
@ -253,14 +326,11 @@ nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
int
nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct nfsd_sattrargs *args = rqstp->rq_argp;
p = decode_fh(p, &args->fh);
if (!p)
return 0;
p = decode_sattr(p, &args->attrs, nfsd_user_namespace(rqstp));
return xdr_argsize_check(rqstp, p);
return svcxdr_decode_fhandle(xdr, &args->fh) &&
svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
}
int