These entry points manipulate various attributes of a file or directory,
including file permissions, owner, group, size,
access time and modification time.
VOP_STAT()
returns data in a format suitable for the
stat(2)
system call and by default is implemented as a wrapper around
VOP_GETATTR().
Filesystems may want to implement their own variant for performance reasons.
For
VOP_GETATTR()
and
VOP_SETATTR()
the arguments are:
|
| vp
|
| |
The vnode of the file.
|
| vap
|
| |
The attributes of the file.
|
| cred
|
| |
The user credentials of the calling thread.
|
|
For
VOP_STAT()
the arguments are:
| vp
|
| |
The vnode of the file.
|
| sb
|
| |
The attributes of the file.
|
| active_cred
|
| |
The user credentials of the calling thread.
|
| file_cred
|
| |
The credentials installed on the file description pointing to the vnode or NOCRED.
|
| td
|
| |
The calling thread.
|
|
Attributes which are not being modified by
VOP_SETATTR()
should be set to the value
VNOVAL;
VATTR_NULL()
may be used to clear all the values, and should generally be used to reset
the contents of
*vap
prior to setting specific values.
