file_permission(9) [suse man page]

FILE_PERMISSION(9)						   The Linux VFS						FILE_PERMISSION(9)

NAME

       file_permission - check for additional access rights to a given file

SYNOPSIS

       int file_permission(struct file * file, int mask);

ARGUMENTS

       file
	   file 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 an already opened file.

NOTE

       Do not use this function in new code. All access checks should be done using inode_permission.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010							FILE_PERMISSION(9)

VOP_ACCESS(9)						   BSD Kernel Developer's Manual					     VOP_ACCESS(9)

NAME

     VOP_ACCESS, VOP_ACCESSX -- check access permissions of a file or Unix domain socket

SYNOPSIS

     #include <sys/param.h>
     #include <sys/vnode.h>

     int
     VOP_ACCESS(struct vnode *vp, accmode_t accmode, struct ucred *cred, struct thread *td);

     int
     VOP_ACCESSX(struct vnode *vp, accmode_t accmode, struct ucred *cred, struct thread *td);

DESCRIPTION

     This entry point checks the access permissions of the file against the given credentials.

     Its arguments are:

     vp       The vnode of the file to check.

     accmode  The type of access required.

     cred     The user credentials to check.

     td       The thread which is checking.

     The accmode is a mask which can contain flags described in <sys/vnode.h>, e.g.  VREAD, VWRITE or VEXEC.  For VOP_ACCESS(), the only flags
     that may be set in accmode are VEXEC, VWRITE, VREAD, VADMIN and VAPPEND.  To check for other flags, one has to use VOP_ACCESSX() instead.

LOCKS

     The vnode will be locked on entry and should remain locked on return.

RETURN VALUES

     If the file is accessible in the specified way, then zero is returned, otherwise an appropriate error code is returned.

ERRORS

     [EPERM]		An attempt was made to change an immutable file.

     [EACCES]		The permission bits the file mode or the ACL do not permit the requested access.

SEE ALSO

     vaccess(9), vaccess_acl_nfs4(9), vaccess_acl_posix1e(9), vnode(9)

AUTHORS

     This manual page was written by Doug Rabson.

BSD
								September 18, 2009							       BSD