Manual Reference Pages - VOP_ADVISE (9)
- apply advice about use of file data
VOP_ADVISE struct vnode *vp off_t start off_t end int advice
This call applies advice for a range of a files data.
It is used to implement the
Its arguments are:
The vnode of the file.
The start of the range of file data.
The end of the range of file data.
A value of
indicates that the advice is to be applied up to the end of the file.
The type of operation to apply to the file data.
Possible values are:
Initiate an asynchronous read of the file data if it is not already resident.
Decrease the in-memory priority of clean file data or discard clean file data.
offsets are both zero,
then the operation should be applied to the entire file.
Note that this call is advisory only and may perform the requested
operation on a subset of the requested range
(including not performing it at all)
and still return success.
The file should be unlocked on entry.
Zero is returned if the call is successful, otherwise an appropriate
error code is returned.
An invalid value was given for
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