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Subject[PATCH 009 of 9] knfsd: nfsd4: acls: fix handling of zero-length acls

From: J.Bruce Fields <bfields@fieldses.org>

It is legal to have zero-length NFSv4 acls; they just deny everything.

Also, nfs4_acl_nfsv4_to_posix will always return with pacl and dpacl set on
success, so the caller doesn't need to check this.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./fs/nfsd/nfs4acl.c | 15 +--------------
./fs/nfsd/vfs.c | 10 ++++------
2 files changed, 5 insertions(+), 20 deletions(-)
diff .prev/fs/nfsd/nfs4acl.c ./fs/nfsd/nfs4acl.c
--- .prev/fs/nfsd/nfs4acl.c 2006-09-04 17:27:48.000000000 +1000
+++ ./fs/nfsd/nfs4acl.c 2006-09-04 17:28:10.000000000 +1000
@@ -357,33 +357,20 @@ nfs4_acl_nfsv4_to_posix(struct nfs4_acl
goto out;

error = nfs4_acl_split(acl, dacl);
- if (error < 0)
+ if (error)
goto out_acl;

- if (acl->naces == 0) {
- error = -ENODATA;
- goto try_dpacl;
- }
-
*pacl = _nfsv4_to_posix_one(acl, flags);
if (IS_ERR(*pacl)) {
error = PTR_ERR(*pacl);
*pacl = NULL;
goto out_acl;
}
-try_dpacl:
- if (dacl->naces == 0) {
- if (pacl == NULL || *pacl == NULL)
- error = -ENODATA;
- goto out_acl;
- }

- error = 0;
*dpacl = _nfsv4_to_posix_one(dacl, flags);
if (IS_ERR(*dpacl)) {
error = PTR_ERR(*dpacl);
*dpacl = NULL;
- goto out_acl;
}
out_acl:
if (error) {
diff .prev/fs/nfsd/vfs.c ./fs/nfsd/vfs.c
--- .prev/fs/nfsd/vfs.c 2006-09-04 17:09:47.000000000 +1000
+++ ./fs/nfsd/vfs.c 2006-09-04 17:28:10.000000000 +1000
@@ -447,13 +447,11 @@ nfsd4_set_nfs4_acl(struct svc_rqst *rqst
} else if (error < 0)
goto out_nfserr;

- if (pacl) {
- error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
- if (error < 0)
- goto out_nfserr;
- }
+ error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
+ if (error < 0)
+ goto out_nfserr;

- if (dpacl) {
+ if (S_ISDIR(inode->i_mode)) {
error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
if (error < 0)
goto out_nfserr;
-
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