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nfsd: clean up nfsd_mode_check() 

Add some more comments, simplify logic, do & S_IFMT just once, name
"type" more helpfully.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2011-08-15 17:04:19 -04:00
parent 7d818a7b8f
commit e10f9e1413
1 changed files with 18 additions and 12 deletions
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30
fs/nfsd/nfsfh.c
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@ -59,19 +59,25 @@ static int nfsd_acceptable(void *expv, struct dentry *dentry)
* the write call).
*/
static inline __be32
nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int requested)
{
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_notdir;
else if ((mode & S_IFMT) == S_IFDIR)
return nfserr_isdir;
else
return nfserr_inval;
}
return 0;
mode &= S_IFMT;
if (requested == 0) /* the caller doesn't care */
return nfs_ok;
if (mode == requested)
return nfs_ok;
/*
* v4 has an error more specific than err_notdir which we should
* return in preference to err_notdir:
*/
if (rqstp->rq_vers == 4 && mode == S_IFLNK)
return nfserr_symlink;
if (requested == S_IFDIR)
return nfserr_notdir;
if (mode == S_IFDIR)
return nfserr_isdir;
return nfserr_inval;
}
static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,