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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - zfs/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
,
60 /* Rotational optimizations only make sense on block devices */
61 vd
->vdev_nonrot
= B_TRUE
;
64 * We must have a pathname, and it must be absolute.
66 if (vd
->vdev_path
== NULL
|| vd
->vdev_path
[0] != '/') {
67 vd
->vdev_stat
.vs_aux
= VDEV_AUX_BAD_LABEL
;
68 return (SET_ERROR(EINVAL
));
72 * Reopen the device if it's not currently open. Otherwise,
73 * just update the physical size of the device.
75 if (vd
->vdev_tsd
!= NULL
) {
76 ASSERT(vd
->vdev_reopening
);
81 vf
= vd
->vdev_tsd
= kmem_zalloc(sizeof (vdev_file_t
), KM_SLEEP
);
84 * We always open the files from the root of the global zone, even if
85 * we're in a local zone. If the user has gotten to this point, the
86 * administrator has already decided that the pool should be available
87 * to local zone users, so the underlying devices should be as well.
89 ASSERT(vd
->vdev_path
!= NULL
&& vd
->vdev_path
[0] == '/');
90 error
= vn_openat(vd
->vdev_path
+ 1, UIO_SYSSPACE
,
91 spa_mode(vd
->vdev_spa
) | FOFFMAX
, 0, &vp
, 0, 0, rootdir
, -1);
94 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
102 * Make sure it's a regular file.
104 if (vp
->v_type
!= VREG
) {
105 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
106 return (SET_ERROR(ENODEV
));
112 * Determine the physical size of the file.
114 vattr
.va_mask
= AT_SIZE
;
115 error
= VOP_GETATTR(vf
->vf_vnode
, &vattr
, 0, kcred
, NULL
);
117 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
121 *max_psize
= *psize
= vattr
.va_size
;
122 *ashift
= SPA_MINBLOCKSHIFT
;
128 vdev_file_close(vdev_t
*vd
)
130 vdev_file_t
*vf
= vd
->vdev_tsd
;
132 if (vd
->vdev_reopening
|| vf
== NULL
)
135 if (vf
->vf_vnode
!= NULL
) {
136 (void) VOP_PUTPAGE(vf
->vf_vnode
, 0, 0, B_INVAL
, kcred
, NULL
);
137 (void) VOP_CLOSE(vf
->vf_vnode
, spa_mode(vd
->vdev_spa
), 1, 0,
141 vd
->vdev_delayed_close
= B_FALSE
;
142 kmem_free(vf
, sizeof (vdev_file_t
));
147 vdev_file_io_strategy(void *arg
)
149 zio_t
*zio
= (zio_t
*)arg
;
150 vdev_t
*vd
= zio
->io_vd
;
151 vdev_file_t
*vf
= vd
->vdev_tsd
;
154 zio
->io_error
= vn_rdwr(zio
->io_type
== ZIO_TYPE_READ
?
155 UIO_READ
: UIO_WRITE
, vf
->vf_vnode
, zio
->io_data
,
156 zio
->io_size
, zio
->io_offset
, UIO_SYSSPACE
,
157 0, RLIM64_INFINITY
, kcred
, &resid
);
159 if (resid
!= 0 && zio
->io_error
== 0)
160 zio
->io_error
= SET_ERROR(ENOSPC
);
166 vdev_file_io_fsync(void *arg
)
168 zio_t
*zio
= (zio_t
*)arg
;
169 vdev_file_t
*vf
= zio
->io_vd
->vdev_tsd
;
171 zio
->io_error
= VOP_FSYNC(vf
->vf_vnode
, FSYNC
| FDSYNC
, kcred
, NULL
);
177 vdev_file_io_start(zio_t
*zio
)
179 vdev_t
*vd
= zio
->io_vd
;
180 vdev_file_t
*vf
= vd
->vdev_tsd
;
182 if (zio
->io_type
== ZIO_TYPE_IOCTL
) {
184 if (!vdev_readable(vd
)) {
185 zio
->io_error
= SET_ERROR(ENXIO
);
190 switch (zio
->io_cmd
) {
191 case DKIOCFLUSHWRITECACHE
:
193 if (zfs_nocacheflush
)
197 * We cannot safely call vfs_fsync() when PF_FSTRANS
198 * is set in the current context. Filesystems like
199 * XFS include sanity checks to verify it is not
200 * already set, see xfs_vm_writepage(). Therefore
201 * the sync must be dispatched to a different context.
203 if (__spl_pf_fstrans_check()) {
204 VERIFY3U(taskq_dispatch(system_taskq
,
205 vdev_file_io_fsync
, zio
, TQ_SLEEP
), !=, 0);
209 zio
->io_error
= VOP_FSYNC(vf
->vf_vnode
, FSYNC
| FDSYNC
,
213 zio
->io_error
= SET_ERROR(ENOTSUP
);
220 VERIFY3U(taskq_dispatch(system_taskq
, vdev_file_io_strategy
, zio
,
226 vdev_file_io_done(zio_t
*zio
)
230 vdev_ops_t vdev_file_ops
= {
239 VDEV_TYPE_FILE
, /* name of this vdev type */
240 B_TRUE
/* leaf vdev */
244 * From userland we access disks just like files.
248 vdev_ops_t vdev_disk_ops
= {
257 VDEV_TYPE_DISK
, /* name of this vdev type */
258 B_TRUE
/* leaf vdev */