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VOP_DEALLOCATE(9)	    Kernel Developer's Manual	       VOP_DEALLOCATE(9)

NAME
     VOP_DEALLOCATE -- zero and/or deallocate storage from a file

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

     int
     VOP_DEALLOCATE(struct vnode *vp, off_t *offset, off_t *len, int flags,
	 int ioflag, struct ucred *cred);

DESCRIPTION
     This VOP call zeroes/deallocates storage for an offset range in a file.  It
     is used to implement the fspacectl(2) system call.

     Its arguments are:

     vp      The vnode of the file.

     offset  The start of the range to deallocate storage in the file.

     len     The length of the range to deallocate storage in the file.

     flags   The flags of this call.  This should be set to 0 for now.

     ioflag  Directives and hints to be given to the file system.

     cred    The credentials of the caller.

     *offset and *len are updated to reflect the portion of the range that still
     needs  to	be zeroed/deallocated on return.  Partial result is considered a
     successful operation.  For a non-partial successful completion, *len is up-
     dated to be the value 0, and *offset is incremented by the number of  bytes
     zeroed before the end-of-file.

LOCKS
     The vnode should be locked on entry and will still be locked on exit.

RETURN VALUES
     Zero  is returned if the call is successful, otherwise an appropriate error
     code is returned.

ERRORS
     [EINVAL]		Invalid offset, len or flags parameters are passed  into
			this VOP call.

     [ENODEV]		The vnode type is not supported by this VOP call.

     [ENOSPC]		The file system is full.

     [EPERM]		An  append-only  flag is set on the file, but the caller
			is attempting to zero before the current end of file.

SEE ALSO
     vnode(9)

AUTHORS
     VOP_DEALLOCATE  and  this	manual	page   was   written   by   Ka	 Ho   Ng
     <khng@FreeBSD.org> under sponsorship from the FreeBSD Foundation.

FreeBSD ports 15.quarterly	 August 25, 2021	       VOP_DEALLOCATE(9)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=VOP_DEALLOCATE&sektion=9&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>

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