332 lines
7.8 KiB
C
332 lines
7.8 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011, 2016 by Delphix. All rights reserved.
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*/
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/spa_impl.h>
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#include <sys/vdev_file.h>
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#include <sys/vdev_impl.h>
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#include <sys/vdev_trim.h>
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#include <sys/zio.h>
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#include <sys/fs/zfs.h>
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#include <sys/fm/fs/zfs.h>
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#include <sys/abd.h>
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#include <sys/fcntl.h>
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#include <sys/vnode.h>
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/*
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* Virtual device vector for files.
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*/
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static taskq_t *vdev_file_taskq;
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static void
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vdev_file_hold(vdev_t *vd)
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{
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ASSERT(vd->vdev_path != NULL);
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}
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static void
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vdev_file_rele(vdev_t *vd)
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{
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ASSERT(vd->vdev_path != NULL);
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}
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static int
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vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
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uint64_t *ashift)
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{
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vdev_file_t *vf;
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vnode_t *vp;
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vattr_t vattr;
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int error;
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/*
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* Rotational optimizations only make sense on block devices.
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*/
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vd->vdev_nonrot = B_TRUE;
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/*
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* Allow TRIM on file based vdevs. This may not always be supported,
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* since it depends on your kernel version and underlying filesystem
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* type but it is always safe to attempt.
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*/
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vd->vdev_has_trim = B_TRUE;
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/*
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* Disable secure TRIM on file based vdevs. There is no way to
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* request this behavior from the underlying filesystem.
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*/
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vd->vdev_has_securetrim = B_FALSE;
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/*
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* We must have a pathname, and it must be absolute.
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*/
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if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
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vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
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return (SET_ERROR(EINVAL));
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}
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/*
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* Reopen the device if it's not currently open. Otherwise,
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* just update the physical size of the device.
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*/
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if (vd->vdev_tsd != NULL) {
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ASSERT(vd->vdev_reopening);
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vf = vd->vdev_tsd;
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goto skip_open;
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}
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vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP);
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/*
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* We always open the files from the root of the global zone, even if
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* we're in a local zone. If the user has gotten to this point, the
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* administrator has already decided that the pool should be available
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* to local zone users, so the underlying devices should be as well.
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*/
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ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/');
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error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE,
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spa_mode(vd->vdev_spa) | FOFFMAX, 0, &vp, 0, 0, rootdir, -1);
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if (error) {
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vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
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return (error);
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}
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vf->vf_vnode = vp;
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#ifdef _KERNEL
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/*
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* Make sure it's a regular file.
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*/
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if (vp->v_type != VREG) {
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vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
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return (SET_ERROR(ENODEV));
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}
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#endif
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skip_open:
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/*
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* Determine the physical size of the file.
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*/
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vattr.va_mask = AT_SIZE;
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error = VOP_GETATTR(vf->vf_vnode, &vattr, 0, kcred, NULL);
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if (error) {
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vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
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return (error);
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}
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*max_psize = *psize = vattr.va_size;
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*ashift = SPA_MINBLOCKSHIFT;
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return (0);
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}
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static void
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vdev_file_close(vdev_t *vd)
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{
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vdev_file_t *vf = vd->vdev_tsd;
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if (vd->vdev_reopening || vf == NULL)
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return;
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if (vf->vf_vnode != NULL) {
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(void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL);
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(void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0,
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kcred, NULL);
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}
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vd->vdev_delayed_close = B_FALSE;
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kmem_free(vf, sizeof (vdev_file_t));
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vd->vdev_tsd = NULL;
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}
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static void
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vdev_file_io_strategy(void *arg)
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{
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zio_t *zio = (zio_t *)arg;
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vdev_t *vd = zio->io_vd;
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vdev_file_t *vf = vd->vdev_tsd;
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ssize_t resid;
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void *buf;
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if (zio->io_type == ZIO_TYPE_READ)
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buf = abd_borrow_buf(zio->io_abd, zio->io_size);
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else
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buf = abd_borrow_buf_copy(zio->io_abd, zio->io_size);
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zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ?
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UIO_READ : UIO_WRITE, vf->vf_vnode, buf, zio->io_size,
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zio->io_offset, UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, &resid);
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if (zio->io_type == ZIO_TYPE_READ)
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abd_return_buf_copy(zio->io_abd, buf, zio->io_size);
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else
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abd_return_buf(zio->io_abd, buf, zio->io_size);
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if (resid != 0 && zio->io_error == 0)
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zio->io_error = SET_ERROR(ENOSPC);
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zio_delay_interrupt(zio);
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}
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static void
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vdev_file_io_fsync(void *arg)
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{
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zio_t *zio = (zio_t *)arg;
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vdev_file_t *vf = zio->io_vd->vdev_tsd;
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zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC, kcred, NULL);
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zio_interrupt(zio);
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}
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static void
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vdev_file_io_start(zio_t *zio)
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{
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vdev_t *vd = zio->io_vd;
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vdev_file_t *vf = vd->vdev_tsd;
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if (zio->io_type == ZIO_TYPE_IOCTL) {
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/* XXPOLICY */
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if (!vdev_readable(vd)) {
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zio->io_error = SET_ERROR(ENXIO);
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zio_interrupt(zio);
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return;
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}
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switch (zio->io_cmd) {
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case DKIOCFLUSHWRITECACHE:
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if (zfs_nocacheflush)
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break;
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/*
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* We cannot safely call vfs_fsync() when PF_FSTRANS
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* is set in the current context. Filesystems like
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* XFS include sanity checks to verify it is not
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* already set, see xfs_vm_writepage(). Therefore
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* the sync must be dispatched to a different context.
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*/
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if (__spl_pf_fstrans_check()) {
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VERIFY3U(taskq_dispatch(vdev_file_taskq,
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vdev_file_io_fsync, zio, TQ_SLEEP), !=,
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TASKQID_INVALID);
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return;
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}
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zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC,
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kcred, NULL);
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break;
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default:
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zio->io_error = SET_ERROR(ENOTSUP);
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}
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zio_execute(zio);
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return;
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} else if (zio->io_type == ZIO_TYPE_TRIM) {
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struct flock flck;
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ASSERT3U(zio->io_size, !=, 0);
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bzero(&flck, sizeof (flck));
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flck.l_type = F_FREESP;
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flck.l_start = zio->io_offset;
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flck.l_len = zio->io_size;
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flck.l_whence = SEEK_SET;
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zio->io_error = VOP_SPACE(vf->vf_vnode, F_FREESP, &flck,
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0, 0, kcred, NULL);
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zio_execute(zio);
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return;
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}
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zio->io_target_timestamp = zio_handle_io_delay(zio);
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VERIFY3U(taskq_dispatch(vdev_file_taskq, vdev_file_io_strategy, zio,
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TQ_SLEEP), !=, TASKQID_INVALID);
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}
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/* ARGSUSED */
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static void
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vdev_file_io_done(zio_t *zio)
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{
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}
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vdev_ops_t vdev_file_ops = {
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.vdev_op_open = vdev_file_open,
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.vdev_op_close = vdev_file_close,
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.vdev_op_asize = vdev_default_asize,
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.vdev_op_io_start = vdev_file_io_start,
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.vdev_op_io_done = vdev_file_io_done,
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.vdev_op_state_change = NULL,
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.vdev_op_need_resilver = NULL,
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.vdev_op_hold = vdev_file_hold,
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.vdev_op_rele = vdev_file_rele,
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.vdev_op_remap = NULL,
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.vdev_op_xlate = vdev_default_xlate,
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.vdev_op_type = VDEV_TYPE_FILE, /* name of this vdev type */
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.vdev_op_leaf = B_TRUE /* leaf vdev */
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};
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void
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vdev_file_init(void)
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{
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vdev_file_taskq = taskq_create("z_vdev_file", MAX(boot_ncpus, 16),
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minclsyspri, boot_ncpus, INT_MAX, TASKQ_DYNAMIC);
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VERIFY(vdev_file_taskq);
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}
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void
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vdev_file_fini(void)
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{
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taskq_destroy(vdev_file_taskq);
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}
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/*
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* From userland we access disks just like files.
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*/
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#ifndef _KERNEL
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vdev_ops_t vdev_disk_ops = {
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.vdev_op_open = vdev_file_open,
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.vdev_op_close = vdev_file_close,
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.vdev_op_asize = vdev_default_asize,
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.vdev_op_io_start = vdev_file_io_start,
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.vdev_op_io_done = vdev_file_io_done,
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.vdev_op_state_change = NULL,
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.vdev_op_need_resilver = NULL,
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.vdev_op_hold = vdev_file_hold,
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.vdev_op_rele = vdev_file_rele,
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.vdev_op_remap = NULL,
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.vdev_op_xlate = vdev_default_xlate,
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.vdev_op_type = VDEV_TYPE_DISK, /* name of this vdev type */
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.vdev_op_leaf = B_TRUE /* leaf vdev */
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};
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#endif
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