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nfsd: fix compose_entry_fh() failure exits 

Restore the original logics ("fail on mountpoints, negatives and in
case of fh_compose() failures").  Since commit 8177e (nfsd: clean up
readdirplus encoding) that got broken -
	rv = fh_compose(fhp, exp, dchild, &cd->fh);
	if (rv)
	       goto out;
	if (!dchild->d_inode)
		goto out;
	rv = 0;
out:
is equivalent to
	rv = fh_compose(fhp, exp, dchild, &cd->fh);
out:
and the second check has no effect whatsoever...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-04-13 00:32:14 -04:00
parent afcf6792af
commit efe39651f0
1 changed files with 8 additions and 14 deletions
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22
fs/nfsd/nfs3xdr.c
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@ -803,13 +803,13 @@ encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
return p;
}
static int
static __be32
compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
const char *name, int namlen)
{
struct svc_export *exp;
struct dentry *dparent, *dchild;
int rv = 0;
__be32 rv = nfserr_noent;
dparent = cd->fh.fh_dentry;
exp = cd->fh.fh_export;
@ -817,26 +817,20 @@ compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
if (isdotent(name, namlen)) {
if (namlen == 2) {
dchild = dget_parent(dparent);
if (dchild == dparent) {
/* filesystem root - cannot return filehandle for ".." */
dput(dchild);
return -ENOENT;
}
/* filesystem root - cannot return filehandle for ".." */
if (dchild == dparent)
goto out;
} else
dchild = dget(dparent);
} else
dchild = lookup_one_len(name, dparent, namlen);
if (IS_ERR(dchild))
return -ENOENT;
rv = -ENOENT;
return rv;
if (d_mountpoint(dchild))
goto out;
rv = fh_compose(fhp, exp, dchild, &cd->fh);
if (rv)
goto out;
if (!dchild->d_inode)
goto out;
rv = 0;
rv = fh_compose(fhp, exp, dchild, &cd->fh);
out:
dput(dchild);
return rv;
@ -845,7 +839,7 @@ out:
static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
{
struct svc_fh fh;
int err;
__be32 err;
fh_init(&fh, NFS3_FHSIZE);
err = compose_entry_fh(cd, &fh, name, namlen);