GENERIC_PERMISSION(9)                     The Linux VFS                     GENERIC_PERMISSION(9)



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

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

ARGUMENTS
       inode
           inode to check access rights for

       mask
           right to check for (MAY_READ, MAY_WRITE, MAY_EXEC, ...)

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.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                     GENERIC_PERMISSION(9)