Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / hfsplus / posix_acl.c

diff --git a/kernel/fs/hfsplus/posix_acl.c b/kernel/fs/hfsplus/posix_acl.c
new file mode 100644 (file)
index 0000000..df0c9af
--- /dev/null
+++ b/kernel/fs/hfsplus/posix_acl.c
@@ -0,0 +1,140 @@
+/*
+ * linux/fs/hfsplus/posix_acl.c
+ *
+ * Vyacheslav Dubeyko <slava@dubeyko.com>
+ *
+ * Handler for Posix Access Control Lists (ACLs) support.
+ */
+
+#include "hfsplus_fs.h"
+#include "xattr.h"
+#include "acl.h"
+
+struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
+{
+       struct posix_acl *acl;
+       char *xattr_name;
+       char *value = NULL;
+       ssize_t size;
+
+       hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
+
+       switch (type) {
+       case ACL_TYPE_ACCESS:
+               xattr_name = POSIX_ACL_XATTR_ACCESS;
+               break;
+       case ACL_TYPE_DEFAULT:
+               xattr_name = POSIX_ACL_XATTR_DEFAULT;
+               break;
+       default:
+               return ERR_PTR(-EINVAL);
+       }
+
+       size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);
+
+       if (size > 0) {
+               value = (char *)hfsplus_alloc_attr_entry();
+               if (unlikely(!value))
+                       return ERR_PTR(-ENOMEM);
+               size = __hfsplus_getxattr(inode, xattr_name, value, size);
+       }
+
+       if (size > 0)
+               acl = posix_acl_from_xattr(&init_user_ns, value, size);
+       else if (size == -ENODATA)
+               acl = NULL;
+       else
+               acl = ERR_PTR(size);
+
+       hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
+
+       if (!IS_ERR(acl))
+               set_cached_acl(inode, type, acl);
+
+       return acl;
+}
+
+int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl,
+               int type)
+{
+       int err;
+       char *xattr_name;
+       size_t size = 0;
+       char *value = NULL;
+
+       hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
+
+       switch (type) {
+       case ACL_TYPE_ACCESS:
+               xattr_name = POSIX_ACL_XATTR_ACCESS;
+               if (acl) {
+                       err = posix_acl_equiv_mode(acl, &inode->i_mode);
+                       if (err < 0)
+                               return err;
+               }
+               err = 0;
+               break;
+
+       case ACL_TYPE_DEFAULT:
+               xattr_name = POSIX_ACL_XATTR_DEFAULT;
+               if (!S_ISDIR(inode->i_mode))
+                       return acl ? -EACCES : 0;
+               break;
+
+       default:
+               return -EINVAL;
+       }
+
+       if (acl) {
+               size = posix_acl_xattr_size(acl->a_count);
+               if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
+                       return -ENOMEM;
+               value = (char *)hfsplus_alloc_attr_entry();
+               if (unlikely(!value))
+                       return -ENOMEM;
+               err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
+               if (unlikely(err < 0))
+                       goto end_set_acl;
+       }
+
+       err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);
+
+end_set_acl:
+       hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
+
+       if (!err)
+               set_cached_acl(inode, type, acl);
+
+       return err;
+}
+
+int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
+{
+       int err = 0;
+       struct posix_acl *default_acl, *acl;
+
+       hfs_dbg(ACL_MOD,
+               "[%s]: ino %lu, dir->ino %lu\n",
+               __func__, inode->i_ino, dir->i_ino);
+
+       if (S_ISLNK(inode->i_mode))
+               return 0;
+
+       err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
+       if (err)
+               return err;
+
+       if (default_acl) {
+               err = hfsplus_set_posix_acl(inode, default_acl,
+                                           ACL_TYPE_DEFAULT);
+               posix_acl_release(default_acl);
+       }
+
+       if (acl) {
+               if (!err)
+                       err = hfsplus_set_posix_acl(inode, acl,
+                                                   ACL_TYPE_ACCESS);
+               posix_acl_release(acl);
+       }
+       return err;
+}