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nfsd: open-code special directory-hardlink check

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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>
This commit is contained in:
J. Bruce Fields 2011-08-15 16:59:55 -04:00
parent 3d2544b1e4
commit 7d818a7b8f
2 changed files with 4 additions and 11 deletions
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9
fs/nfsd/nfsfh.c
View file

@ -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;
}

6
fs/nfsd/vfs.c
View file

@ -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;