1. NAME▲

generic_permission - check for access rights on a Posix-like filesystem

2. SYNOPSIS ▲

int generic_permission(struct inode *  inode , int  mask );

3. ARGUMENTS ▲

inode
    inode to check access rights for

mask
    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 ▲