generic_permission - check for access rights on a Posix-like filesystem
2. SYNOPSIS ▲
int generic_permission(struct inode * inode , int mask );
3. ARGUMENTS ▲
inode to check access rights for
right to check for (MAY_READ, MAY_WRITE, MAY_EXEC, ...)
4. DESCRIPTION ▲
Used to check for read/write/execute permissions on a file. We use « fsuid » for this, letting us set arbitrary permissions for filesystem access without changing the « normal » uids which are used for other things.
generic_permission is rcu-walk aware. It returns -ECHILD in case an rcu-walk request cannot be satisfied (eg. requires blocking or too much complexity). It would then be called again in ref-walk mode.
5. COPYRIGHT ▲