f0a75d274a
ZFS file system was ported from OpenSolaris operating system. The code in under CDDL license. I'd like to thank all SUN developers that created this great piece of software. Supported by: Wheel LTD (http://www.wheel.pl/) Supported by: The FreeBSD Foundation (http://www.freebsdfoundation.org/) Supported by: Sentex (http://www.sentex.net/)
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/*-
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* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/filedesc.h>
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#include <sys/vnode.h>
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#include <sys/fcntl.h>
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#include <sys/kobj.h>
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void
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kobj_free(void *address, size_t size)
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{
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kmem_free(address, size);
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}
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void *
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kobj_alloc(size_t size, int flag)
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{
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return (kmem_alloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP));
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}
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void *
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kobj_zalloc(size_t size, int flag)
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{
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void *p;
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if ((p = kobj_alloc(size, flag)) != NULL)
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bzero(p, size);
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return (p);
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}
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struct _buf *
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kobj_open_file(const char *file)
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{
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struct thread *td = curthread;
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struct nameidata nd;
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int error, flags;
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if (td->td_proc->p_fd->fd_rdir == NULL)
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td->td_proc->p_fd->fd_rdir = rootvnode;
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if (td->td_proc->p_fd->fd_cdir == NULL)
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td->td_proc->p_fd->fd_cdir = rootvnode;
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flags = FREAD;
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NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, file, td);
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error = vn_open_cred(&nd, &flags, 0, td->td_ucred, -1);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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if (error != 0)
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return ((struct _buf *)-1);
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/* We just unlock so we hold a reference. */
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VOP_UNLOCK(nd.ni_vp, 0, td);
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return ((struct _buf *)nd.ni_vp);
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}
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int
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kobj_get_filesize(struct _buf *file, uint64_t *size)
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{
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struct vnode *vp = (struct vnode *)file;
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struct thread *td = curthread;
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struct vattr va;
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int error;
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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error = VOP_GETATTR(vp, &va, td->td_ucred, td);
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VOP_UNLOCK(vp, 0, td);
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if (error == 0)
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*size = (uint64_t)va.va_size;
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return (error);
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}
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int
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kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
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{
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struct vnode *vp = (struct vnode *)file;
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struct thread *td = curthread;
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struct uio auio;
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struct iovec aiov;
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int error;
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bzero(&aiov, sizeof(aiov));
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bzero(&auio, sizeof(auio));
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aiov.iov_base = buf;
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aiov.iov_len = size;
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auio.uio_iov = &aiov;
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auio.uio_offset = (off_t)off;
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auio.uio_segflg = UIO_SYSSPACE;
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auio.uio_rw = UIO_READ;
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auio.uio_iovcnt = 1;
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auio.uio_resid = size;
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auio.uio_td = td;
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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error = VOP_READ(vp, &auio, IO_UNIT | IO_SYNC, td->td_ucred);
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VOP_UNLOCK(vp, 0, td);
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return (error != 0 ? -1 : size - auio.uio_resid);
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}
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void
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kobj_close_file(struct _buf *file)
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{
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struct vnode *vp = (struct vnode *)file;
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struct thread *td = curthread;
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int flags;
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flags = FREAD;
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vn_close(vp, flags, td->td_ucred, td);
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}
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