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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.
25 #include <sys/zfs_context.h>
27 #include <sys/vdev_file.h>
28 #include <sys/vdev_impl.h>
30 #include <sys/fs/zfs.h>
31 #include <sys/fm/fs/zfs.h>
34 * Virtual device vector for files.
38 vdev_file_hold(vdev_t
*vd
)
40 ASSERT(vd
->vdev_path
!= NULL
);
44 vdev_file_rele(vdev_t
*vd
)
46 ASSERT(vd
->vdev_path
!= NULL
);
50 vdev_file_open(vdev_t
*vd
, uint64_t *psize
, uint64_t *ashift
)
58 * We must have a pathname, and it must be absolute.
60 if (vd
->vdev_path
== NULL
|| vd
->vdev_path
[0] != '/') {
61 vd
->vdev_stat
.vs_aux
= VDEV_AUX_BAD_LABEL
;
66 * Reopen the device if it's not currently open. Otherwise,
67 * just update the physical size of the device.
69 if (vd
->vdev_tsd
!= NULL
) {
70 ASSERT(vd
->vdev_reopening
);
75 vf
= vd
->vdev_tsd
= kmem_zalloc(sizeof (vdev_file_t
), KM_PUSHPAGE
);
78 * We always open the files from the root of the global zone, even if
79 * we're in a local zone. If the user has gotten to this point, the
80 * administrator has already decided that the pool should be available
81 * to local zone users, so the underlying devices should be as well.
83 ASSERT(vd
->vdev_path
!= NULL
&& vd
->vdev_path
[0] == '/');
84 error
= vn_openat(vd
->vdev_path
+ 1, UIO_SYSSPACE
,
85 spa_mode(vd
->vdev_spa
) | FOFFMAX
, 0, &vp
, 0, 0, rootdir
, -1);
88 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
96 * Make sure it's a regular file.
98 if (vp
->v_type
!= VREG
) {
99 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
106 * Determine the physical size of the file.
108 vattr
.va_mask
= AT_SIZE
;
109 error
= VOP_GETATTR(vf
->vf_vnode
, &vattr
, 0, kcred
, NULL
);
111 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
115 *psize
= vattr
.va_size
;
116 *ashift
= SPA_MINBLOCKSHIFT
;
122 vdev_file_close(vdev_t
*vd
)
124 vdev_file_t
*vf
= vd
->vdev_tsd
;
126 if (vd
->vdev_reopening
|| vf
== NULL
)
129 if (vf
->vf_vnode
!= NULL
) {
130 (void) VOP_PUTPAGE(vf
->vf_vnode
, 0, 0, B_INVAL
, kcred
, NULL
);
131 (void) VOP_CLOSE(vf
->vf_vnode
, spa_mode(vd
->vdev_spa
), 1, 0,
135 vd
->vdev_delayed_close
= B_FALSE
;
136 kmem_free(vf
, sizeof (vdev_file_t
));
141 vdev_file_io_start(zio_t
*zio
)
143 vdev_t
*vd
= zio
->io_vd
;
147 if (!vdev_readable(vd
)) {
148 zio
->io_error
= ENXIO
;
149 return (ZIO_PIPELINE_CONTINUE
);
154 if (zio
->io_type
== ZIO_TYPE_IOCTL
) {
155 switch (zio
->io_cmd
) {
156 case DKIOCFLUSHWRITECACHE
:
157 zio
->io_error
= VOP_FSYNC(vf
->vf_vnode
, FSYNC
| FDSYNC
,
161 zio
->io_error
= ENOTSUP
;
164 return (ZIO_PIPELINE_CONTINUE
);
167 zio
->io_error
= vn_rdwr(zio
->io_type
== ZIO_TYPE_READ
?
168 UIO_READ
: UIO_WRITE
, vf
->vf_vnode
, zio
->io_data
,
169 zio
->io_size
, zio
->io_offset
, UIO_SYSSPACE
,
170 0, RLIM64_INFINITY
, kcred
, &resid
);
172 if (resid
!= 0 && zio
->io_error
== 0)
173 zio
->io_error
= ENOSPC
;
177 return (ZIO_PIPELINE_STOP
);
182 vdev_file_io_done(zio_t
*zio
)
186 vdev_ops_t vdev_file_ops
= {
195 VDEV_TYPE_FILE
, /* name of this vdev type */
196 B_TRUE
/* leaf vdev */
200 * From userland we access disks just like files.
204 vdev_ops_t vdev_disk_ops
= {
213 VDEV_TYPE_DISK
, /* name of this vdev type */
214 B_TRUE
/* leaf vdev */