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