fs/9p: Implement create time inheritance

Inherit default ACL on create

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index 8f2acde74c05..8b3c54a4958c 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -152,6 +152,58 @@ int v9fs_acl_chmod(struct dentry *dentry)
         return retval;
 }
 
+int v9fs_set_create_acl(struct dentry *dentry,
+                        struct posix_acl *dpacl, struct posix_acl *pacl)
+{
+        if (dpacl)
+                v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, dpacl);
+        if (pacl)
+                v9fs_set_acl(dentry, ACL_TYPE_ACCESS, pacl);
+        posix_acl_release(dpacl);
+        posix_acl_release(pacl);
+        return 0;
+}
+
+int v9fs_acl_mode(struct inode *dir, mode_t *modep,
+                  struct posix_acl **dpacl, struct posix_acl **pacl)
+{
+        int retval = 0;
+        mode_t mode = *modep;
+        struct posix_acl *acl = NULL;
+
+        if (!S_ISLNK(mode)) {
+                acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
+                if (IS_ERR(acl))
+                        return PTR_ERR(acl);
+                if (!acl)
+                        mode &= ~current_umask();
+        }
+        if (acl) {
+                struct posix_acl *clone;
+
+                if (S_ISDIR(mode))
+                        *dpacl = acl;
+                clone = posix_acl_clone(acl, GFP_NOFS);
+                retval = -ENOMEM;
+                if (!clone)
+                        goto cleanup;
+
+                retval = posix_acl_create_masq(clone, &mode);
+                if (retval < 0) {
+                        posix_acl_release(clone);
+                        goto cleanup;
+                }
+                if (retval > 0)
+                        *pacl = clone;
+        }
+        *modep  = mode;
+        return 0;
+cleanup:
+        posix_acl_release(acl);
+        return retval;
+
+}
+
 static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name,
                               void *buffer, size_t size, int type)
 {