GENERIC_PERMISSION(9) The Linux VFS GENERIC_PERMISSION(9)NAMEgeneric_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.
COPYRIGHTKernel Hackers Manual 3.11 November 2013 GENERIC_PERMISSION(9)