nfsd: open-code special directory-hardlink check
We allow the fh_verify caller to specify that any object *except* those
of a given type is allowed, by passing a negative type. But only one
caller actually uses it. Open-code that check in the one caller.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 90c6aa6..8cd49b9 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -61,7 +61,6 @@
static inline __be32
nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
{
- /* Type can be negative when creating hardlinks - not to a dir */
if (type > 0 && (mode & S_IFMT) != type) {
if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
return nfserr_symlink;
@@ -72,14 +71,6 @@
else
return nfserr_inval;
}
- if (type < 0 && (mode & S_IFMT) == -type) {
- if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
- return nfserr_symlink;
- else if (type == -S_IFDIR)
- return nfserr_isdir;
- else
- return nfserr_notdir;
- }
return 0;
}
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index fd0acca..0c92a17 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1632,10 +1632,12 @@
err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE);
if (err)
goto out;
- err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP);
+ err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP);
if (err)
goto out;
-
+ err = nfserr_isdir;
+ if (S_ISDIR(tfhp->fh_dentry->d_inode->i_mode))
+ goto out;
err = nfserr_perm;
if (!len)
goto out;