inode_permission (9) Linux Manual Page
inode_permission – Check for access rights to a given inode
Synopsis
int inode_permission(struct inode *inode, int mask);Arguments
inode
-
- Inode to check permission on
mask
- Right to check for (MAY_READ, MAY_WRITE, MAY_EXEC)
Description
Check for read/write/execute permissions on an inode. We use fs[ug]id for this, letting us set arbitrary permissions for filesystem access without changing the “normal” UIDs which are used for other things.
When checking for MAY_APPEND, MAY_WRITE must also be set in mask.