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git.proxmox.com Git - mirror_zfs.git/blob - module/zfs/vdev_file.c
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
26 #include <sys/zfs_context.h>
28 #include <sys/spa_impl.h>
29 #include <sys/vdev_file.h>
30 #include <sys/vdev_impl.h>
32 #include <sys/fs/zfs.h>
33 #include <sys/fm/fs/zfs.h>
36 * Virtual device vector for files.
40 vdev_file_hold(vdev_t
*vd
)
42 ASSERT(vd
->vdev_path
!= NULL
);
46 vdev_file_rele(vdev_t
*vd
)
48 ASSERT(vd
->vdev_path
!= NULL
);
52 vdev_file_open(vdev_t
*vd
, uint64_t *psize
, uint64_t *max_psize
,
61 * We must have a pathname, and it must be absolute.
63 if (vd
->vdev_path
== NULL
|| vd
->vdev_path
[0] != '/') {
64 vd
->vdev_stat
.vs_aux
= VDEV_AUX_BAD_LABEL
;
65 return (SET_ERROR(EINVAL
));
69 * Reopen the device if it's not currently open. Otherwise,
70 * just update the physical size of the device.
72 if (vd
->vdev_tsd
!= NULL
) {
73 ASSERT(vd
->vdev_reopening
);
78 vf
= vd
->vdev_tsd
= kmem_zalloc(sizeof (vdev_file_t
), KM_SLEEP
);
81 * We always open the files from the root of the global zone, even if
82 * we're in a local zone. If the user has gotten to this point, the
83 * administrator has already decided that the pool should be available
84 * to local zone users, so the underlying devices should be as well.
86 ASSERT(vd
->vdev_path
!= NULL
&& vd
->vdev_path
[0] == '/');
87 error
= vn_openat(vd
->vdev_path
+ 1, UIO_SYSSPACE
,
88 spa_mode(vd
->vdev_spa
) | FOFFMAX
, 0, &vp
, 0, 0, rootdir
, -1);
91 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
99 * Make sure it's a regular file.
101 if (vp
->v_type
!= VREG
) {
102 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
103 return (SET_ERROR(ENODEV
));
109 * Determine the physical size of the file.
111 vattr
.va_mask
= AT_SIZE
;
112 error
= VOP_GETATTR(vf
->vf_vnode
, &vattr
, 0, kcred
, NULL
);
114 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
118 *max_psize
= *psize
= vattr
.va_size
;
119 *ashift
= SPA_MINBLOCKSHIFT
;
125 vdev_file_close(vdev_t
*vd
)
127 vdev_file_t
*vf
= vd
->vdev_tsd
;
129 if (vd
->vdev_reopening
|| vf
== NULL
)
132 if (vf
->vf_vnode
!= NULL
) {
133 (void) VOP_PUTPAGE(vf
->vf_vnode
, 0, 0, B_INVAL
, kcred
, NULL
);
134 (void) VOP_CLOSE(vf
->vf_vnode
, spa_mode(vd
->vdev_spa
), 1, 0,
138 vd
->vdev_delayed_close
= B_FALSE
;
139 kmem_free(vf
, sizeof (vdev_file_t
));
144 vdev_file_io_strategy(void *arg
)
146 zio_t
*zio
= (zio_t
*)arg
;
147 vdev_t
*vd
= zio
->io_vd
;
148 vdev_file_t
*vf
= vd
->vdev_tsd
;
151 zio
->io_error
= vn_rdwr(zio
->io_type
== ZIO_TYPE_READ
?
152 UIO_READ
: UIO_WRITE
, vf
->vf_vnode
, zio
->io_data
,
153 zio
->io_size
, zio
->io_offset
, UIO_SYSSPACE
,
154 0, RLIM64_INFINITY
, kcred
, &resid
);
156 if (resid
!= 0 && zio
->io_error
== 0)
157 zio
->io_error
= SET_ERROR(ENOSPC
);
163 vdev_file_io_fsync(void *arg
)
165 zio_t
*zio
= (zio_t
*)arg
;
166 vdev_file_t
*vf
= zio
->io_vd
->vdev_tsd
;
168 zio
->io_error
= VOP_FSYNC(vf
->vf_vnode
, FSYNC
| FDSYNC
, kcred
, NULL
);
174 vdev_file_io_start(zio_t
*zio
)
176 vdev_t
*vd
= zio
->io_vd
;
177 vdev_file_t
*vf
= vd
->vdev_tsd
;
179 if (zio
->io_type
== ZIO_TYPE_IOCTL
) {
181 if (!vdev_readable(vd
)) {
182 zio
->io_error
= SET_ERROR(ENXIO
);
187 switch (zio
->io_cmd
) {
188 case DKIOCFLUSHWRITECACHE
:
190 if (zfs_nocacheflush
)
194 * We cannot safely call vfs_fsync() when PF_FSTRANS
195 * is set in the current context. Filesystems like
196 * XFS include sanity checks to verify it is not
197 * already set, see xfs_vm_writepage(). Therefore
198 * the sync must be dispatched to a different context.
200 if (spl_fstrans_check()) {
201 VERIFY3U(taskq_dispatch(system_taskq
,
202 vdev_file_io_fsync
, zio
, TQ_SLEEP
), !=, 0);
206 zio
->io_error
= VOP_FSYNC(vf
->vf_vnode
, FSYNC
| FDSYNC
,
210 zio
->io_error
= SET_ERROR(ENOTSUP
);
217 VERIFY3U(taskq_dispatch(system_taskq
, vdev_file_io_strategy
, zio
,
223 vdev_file_io_done(zio_t
*zio
)
227 vdev_ops_t vdev_file_ops
= {
236 VDEV_TYPE_FILE
, /* name of this vdev type */
237 B_TRUE
/* leaf vdev */
241 * From userland we access disks just like files.
245 vdev_ops_t vdev_disk_ops
= {
254 VDEV_TYPE_DISK
, /* name of this vdev type */
255 B_TRUE
/* leaf vdev */