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authorJ. Bruce Fields <bfields@redhat.com>2011-08-16 00:59:55 +0400
committerJ. Bruce Fields <bfields@redhat.com>2011-08-27 02:22:47 +0400
commit7d818a7b8fc8d26c24ee44ed1c5dece69455a7b6 (patch)
tree660675f24b5dcb74630defb9a576d1cba6fb36a8
parent3d2544b1e4909b6dffa0d140273628913e255e45 (diff)
downloadlinux-7d818a7b8fc8d26c24ee44ed1c5dece69455a7b6.tar.xz
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>
-rw-r--r--fs/nfsd/nfsfh.c9
-rw-r--r--fs/nfsd/vfs.c6
2 files changed, 4 insertions, 11 deletions
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 90c6aa6d5e0f..8cd49b9bf085 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -61,7 +61,6 @@ static int nfsd_acceptable(void *expv, struct dentry *dentry)
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 @@ nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
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 fd0acca5370a..0c92a17d1770 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1632,10 +1632,12 @@ nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
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;