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Man Pages
VOP_ATTRIB(9) FreeBSD Kernel Developer's Manual VOP_ATTRIB(9)

VOP_GETATTR, VOP_SETATTR
get and set attributes on a file or directory

#include <sys/param.h>
#include <sys/vnode.h>
int
VOP_GETATTR(struct vnode *vp, struct vattr *vap, struct ucred *cred);
int
VOP_SETATTR(struct vnode *vp, struct vattr *vap, struct ucred *cred);

These entry points manipulate various attributes of a file or directory, including file permissions, owner, group, size, access time and modification time.
The arguments are:
vp
The vnode of the file.
vap
The attributes of the file.
cred
The user credentials of the calling process.
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.

VOP_GETATTR() expects the vnode to be locked on entry and will leave the vnode locked on return. The lock type can be either shared or exclusive.
VOP_SETATTR() expects the vnode to be locked on entry and will leave the vnode locked on return. The lock type must be exclusive.

VOP_GETATTR() returns 0 if it was able to retrieve the attribute data via *vap, otherwise an appropriate error is returned. VOP_SETATTR() returns zero if the attributes were changed successfully, otherwise an appropriate error is returned.

[]
The file is immutable.
[]
The caller does not have permission to modify the file or directory attributes.
[]
The file system is read-only.

VFS(9), vnode(9), VOP_ACCESS(9)

This manual page was written by Doug Rabson.
August 29, 2008 FreeBSD 12.0-RELEASE

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