FreeBSD Manual Pages
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 con- sidered a successful operation. For a non-partial successful comple- tion, *len is updated 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 14.3 August 25, 2021 VOP_DEALLOCATE(9)
NAME | SYNOPSIS | DESCRIPTION | LOCKS | RETURN VALUES | ERRORS | SEE ALSO | AUTHORS
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