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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, 2015 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>
37 * Virtual device vector for files.
40 static taskq_t
*vdev_file_taskq
;
43 vdev_file_hold(vdev_t
*vd
)
45 ASSERT(vd
->vdev_path
!= NULL
);
49 vdev_file_rele(vdev_t
*vd
)
51 ASSERT(vd
->vdev_path
!= NULL
);
55 vdev_file_open(vdev_t
*vd
, uint64_t *psize
, uint64_t *max_psize
,
63 /* Rotational optimizations only make sense on block devices */
64 vd
->vdev_nonrot
= B_TRUE
;
67 * We must have a pathname, and it must be absolute.
69 if (vd
->vdev_path
== NULL
|| vd
->vdev_path
[0] != '/') {
70 vd
->vdev_stat
.vs_aux
= VDEV_AUX_BAD_LABEL
;
71 return (SET_ERROR(EINVAL
));
75 * Reopen the device if it's not currently open. Otherwise,
76 * just update the physical size of the device.
78 if (vd
->vdev_tsd
!= NULL
) {
79 ASSERT(vd
->vdev_reopening
);
84 vf
= vd
->vdev_tsd
= kmem_zalloc(sizeof (vdev_file_t
), KM_SLEEP
);
87 * We always open the files from the root of the global zone, even if
88 * we're in a local zone. If the user has gotten to this point, the
89 * administrator has already decided that the pool should be available
90 * to local zone users, so the underlying devices should be as well.
92 ASSERT(vd
->vdev_path
!= NULL
&& vd
->vdev_path
[0] == '/');
93 error
= vn_openat(vd
->vdev_path
+ 1, UIO_SYSSPACE
,
94 spa_mode(vd
->vdev_spa
) | FOFFMAX
, 0, &vp
, 0, 0, rootdir
, -1);
97 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
105 * Make sure it's a regular file.
107 if (vp
->v_type
!= VREG
) {
108 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
109 return (SET_ERROR(ENODEV
));
115 * Determine the physical size of the file.
117 vattr
.va_mask
= AT_SIZE
;
118 error
= VOP_GETATTR(vf
->vf_vnode
, &vattr
, 0, kcred
, NULL
);
120 vd
->vdev_stat
.vs_aux
= VDEV_AUX_OPEN_FAILED
;
124 *max_psize
= *psize
= vattr
.va_size
;
125 *ashift
= SPA_MINBLOCKSHIFT
;
131 vdev_file_close(vdev_t
*vd
)
133 vdev_file_t
*vf
= vd
->vdev_tsd
;
135 if (vd
->vdev_reopening
|| vf
== NULL
)
138 if (vf
->vf_vnode
!= NULL
) {
139 (void) VOP_PUTPAGE(vf
->vf_vnode
, 0, 0, B_INVAL
, kcred
, NULL
);
140 (void) VOP_CLOSE(vf
->vf_vnode
, spa_mode(vd
->vdev_spa
), 1, 0,
144 vd
->vdev_delayed_close
= B_FALSE
;
145 kmem_free(vf
, sizeof (vdev_file_t
));
150 vdev_file_io_strategy(void *arg
)
152 zio_t
*zio
= (zio_t
*)arg
;
153 vdev_t
*vd
= zio
->io_vd
;
154 vdev_file_t
*vf
= vd
->vdev_tsd
;
158 if (zio
->io_type
== ZIO_TYPE_READ
)
159 buf
= abd_borrow_buf(zio
->io_abd
, zio
->io_size
);
161 buf
= abd_borrow_buf_copy(zio
->io_abd
, zio
->io_size
);
163 zio
->io_error
= vn_rdwr(zio
->io_type
== ZIO_TYPE_READ
?
164 UIO_READ
: UIO_WRITE
, vf
->vf_vnode
, buf
, zio
->io_size
,
165 zio
->io_offset
, UIO_SYSSPACE
, 0, RLIM64_INFINITY
, kcred
, &resid
);
167 if (zio
->io_type
== ZIO_TYPE_READ
)
168 abd_return_buf_copy(zio
->io_abd
, buf
, zio
->io_size
);
170 abd_return_buf(zio
->io_abd
, buf
, zio
->io_size
);
172 if (resid
!= 0 && zio
->io_error
== 0)
173 zio
->io_error
= SET_ERROR(ENOSPC
);
175 zio_delay_interrupt(zio
);
179 vdev_file_io_fsync(void *arg
)
181 zio_t
*zio
= (zio_t
*)arg
;
182 vdev_file_t
*vf
= zio
->io_vd
->vdev_tsd
;
184 zio
->io_error
= VOP_FSYNC(vf
->vf_vnode
, FSYNC
| FDSYNC
, kcred
, NULL
);
190 vdev_file_io_start(zio_t
*zio
)
192 vdev_t
*vd
= zio
->io_vd
;
193 vdev_file_t
*vf
= vd
->vdev_tsd
;
195 if (zio
->io_type
== ZIO_TYPE_IOCTL
) {
197 if (!vdev_readable(vd
)) {
198 zio
->io_error
= SET_ERROR(ENXIO
);
203 switch (zio
->io_cmd
) {
204 case DKIOCFLUSHWRITECACHE
:
206 if (zfs_nocacheflush
)
210 * We cannot safely call vfs_fsync() when PF_FSTRANS
211 * is set in the current context. Filesystems like
212 * XFS include sanity checks to verify it is not
213 * already set, see xfs_vm_writepage(). Therefore
214 * the sync must be dispatched to a different context.
216 if (__spl_pf_fstrans_check()) {
217 VERIFY3U(taskq_dispatch(vdev_file_taskq
,
218 vdev_file_io_fsync
, zio
, TQ_SLEEP
), !=,
223 zio
->io_error
= VOP_FSYNC(vf
->vf_vnode
, FSYNC
| FDSYNC
,
227 zio
->io_error
= SET_ERROR(ENOTSUP
);
234 zio
->io_target_timestamp
= zio_handle_io_delay(zio
);
236 VERIFY3U(taskq_dispatch(vdev_file_taskq
, vdev_file_io_strategy
, zio
,
237 TQ_SLEEP
), !=, TASKQID_INVALID
);
242 vdev_file_io_done(zio_t
*zio
)
246 vdev_ops_t vdev_file_ops
= {
256 VDEV_TYPE_FILE
, /* name of this vdev type */
257 B_TRUE
/* leaf vdev */
263 vdev_file_taskq
= taskq_create("z_vdev_file", MAX(boot_ncpus
, 16),
264 minclsyspri
, boot_ncpus
, INT_MAX
, TASKQ_DYNAMIC
);
266 VERIFY(vdev_file_taskq
);
272 taskq_destroy(vdev_file_taskq
);
276 * From userland we access disks just like files.
280 vdev_ops_t vdev_disk_ops
= {
290 VDEV_TYPE_DISK
, /* name of this vdev type */
291 B_TRUE
/* leaf vdev */