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34dc7c2f BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
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. | |
7 | * | |
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. | |
12 | * | |
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] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
34dc7c2f BB |
23 | */ |
24 | ||
34dc7c2f BB |
25 | #include <sys/zfs_context.h> |
26 | #include <sys/spa.h> | |
27 | #include <sys/vdev_file.h> | |
28 | #include <sys/vdev_impl.h> | |
29 | #include <sys/zio.h> | |
30 | #include <sys/fs/zfs.h> | |
b128c09f | 31 | #include <sys/fm/fs/zfs.h> |
34dc7c2f BB |
32 | |
33 | /* | |
34 | * Virtual device vector for files. | |
35 | */ | |
36 | ||
428870ff BB |
37 | static void |
38 | vdev_file_hold(vdev_t *vd) | |
39 | { | |
40 | ASSERT(vd->vdev_path != NULL); | |
41 | } | |
42 | ||
43 | static void | |
44 | vdev_file_rele(vdev_t *vd) | |
45 | { | |
46 | ASSERT(vd->vdev_path != NULL); | |
47 | } | |
48 | ||
34dc7c2f | 49 | static int |
b128c09f | 50 | vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) |
34dc7c2f BB |
51 | { |
52 | vdev_file_t *vf; | |
53 | vnode_t *vp; | |
b128c09f | 54 | vattr_t vattr; |
34dc7c2f BB |
55 | int error; |
56 | ||
57 | /* | |
58 | * We must have a pathname, and it must be absolute. | |
59 | */ | |
60 | if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { | |
61 | vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; | |
62 | return (EINVAL); | |
63 | } | |
64 | ||
428870ff BB |
65 | /* |
66 | * Reopen the device if it's not currently open. Otherwise, | |
67 | * just update the physical size of the device. | |
68 | */ | |
69 | if (vd->vdev_tsd != NULL) { | |
70 | ASSERT(vd->vdev_reopening); | |
71 | vf = vd->vdev_tsd; | |
72 | goto skip_open; | |
73 | } | |
74 | ||
b8d06fca | 75 | vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_PUSHPAGE); |
34dc7c2f BB |
76 | |
77 | /* | |
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. | |
82 | */ | |
83 | ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/'); | |
84 | error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE, | |
fb5f0bc8 | 85 | spa_mode(vd->vdev_spa) | FOFFMAX, 0, &vp, 0, 0, rootdir, -1); |
34dc7c2f BB |
86 | |
87 | if (error) { | |
88 | vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
89 | return (error); | |
90 | } | |
91 | ||
92 | vf->vf_vnode = vp; | |
93 | ||
94 | #ifdef _KERNEL | |
95 | /* | |
96 | * Make sure it's a regular file. | |
97 | */ | |
98 | if (vp->v_type != VREG) { | |
99 | vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
100 | return (ENODEV); | |
101 | } | |
102 | #endif | |
428870ff BB |
103 | |
104 | skip_open: | |
34dc7c2f BB |
105 | /* |
106 | * Determine the physical size of the file. | |
107 | */ | |
108 | vattr.va_mask = AT_SIZE; | |
109 | error = VOP_GETATTR(vf->vf_vnode, &vattr, 0, kcred, NULL); | |
110 | if (error) { | |
111 | vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
112 | return (error); | |
113 | } | |
114 | ||
115 | *psize = vattr.va_size; | |
116 | *ashift = SPA_MINBLOCKSHIFT; | |
117 | ||
118 | return (0); | |
119 | } | |
120 | ||
121 | static void | |
122 | vdev_file_close(vdev_t *vd) | |
123 | { | |
124 | vdev_file_t *vf = vd->vdev_tsd; | |
125 | ||
428870ff | 126 | if (vd->vdev_reopening || vf == NULL) |
34dc7c2f BB |
127 | return; |
128 | ||
129 | if (vf->vf_vnode != NULL) { | |
130 | (void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL); | |
fb5f0bc8 BB |
131 | (void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0, |
132 | kcred, NULL); | |
34dc7c2f BB |
133 | } |
134 | ||
428870ff | 135 | vd->vdev_delayed_close = B_FALSE; |
34dc7c2f BB |
136 | kmem_free(vf, sizeof (vdev_file_t)); |
137 | vd->vdev_tsd = NULL; | |
138 | } | |
139 | ||
34dc7c2f BB |
140 | static int |
141 | vdev_file_io_start(zio_t *zio) | |
142 | { | |
143 | vdev_t *vd = zio->io_vd; | |
3adfc400 | 144 | vdev_file_t *vf; |
d4ed6673 | 145 | ssize_t resid = 0; |
34dc7c2f | 146 | |
3adfc400 AG |
147 | if (!vdev_readable(vd)) { |
148 | zio->io_error = ENXIO; | |
149 | return (ZIO_PIPELINE_CONTINUE); | |
150 | } | |
151 | ||
152 | vf = vd->vdev_tsd; | |
34dc7c2f | 153 | |
3adfc400 | 154 | if (zio->io_type == ZIO_TYPE_IOCTL) { |
34dc7c2f BB |
155 | switch (zio->io_cmd) { |
156 | case DKIOCFLUSHWRITECACHE: | |
157 | zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC, | |
158 | kcred, NULL); | |
34dc7c2f BB |
159 | break; |
160 | default: | |
161 | zio->io_error = ENOTSUP; | |
162 | } | |
163 | ||
164 | return (ZIO_PIPELINE_CONTINUE); | |
165 | } | |
166 | ||
34dc7c2f BB |
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); | |
171 | ||
172 | if (resid != 0 && zio->io_error == 0) | |
173 | zio->io_error = ENOSPC; | |
174 | ||
175 | zio_interrupt(zio); | |
176 | ||
177 | return (ZIO_PIPELINE_STOP); | |
178 | } | |
179 | ||
b128c09f BB |
180 | /* ARGSUSED */ |
181 | static void | |
34dc7c2f BB |
182 | vdev_file_io_done(zio_t *zio) |
183 | { | |
34dc7c2f BB |
184 | } |
185 | ||
186 | vdev_ops_t vdev_file_ops = { | |
187 | vdev_file_open, | |
188 | vdev_file_close, | |
34dc7c2f BB |
189 | vdev_default_asize, |
190 | vdev_file_io_start, | |
191 | vdev_file_io_done, | |
192 | NULL, | |
428870ff BB |
193 | vdev_file_hold, |
194 | vdev_file_rele, | |
34dc7c2f BB |
195 | VDEV_TYPE_FILE, /* name of this vdev type */ |
196 | B_TRUE /* leaf vdev */ | |
197 | }; | |
198 | ||
199 | /* | |
200 | * From userland we access disks just like files. | |
201 | */ | |
202 | #ifndef _KERNEL | |
203 | ||
204 | vdev_ops_t vdev_disk_ops = { | |
205 | vdev_file_open, | |
206 | vdev_file_close, | |
34dc7c2f BB |
207 | vdev_default_asize, |
208 | vdev_file_io_start, | |
209 | vdev_file_io_done, | |
210 | NULL, | |
428870ff BB |
211 | vdev_file_hold, |
212 | vdev_file_rele, | |
34dc7c2f BB |
213 | VDEV_TYPE_DISK, /* name of this vdev type */ |
214 | B_TRUE /* leaf vdev */ | |
215 | }; | |
216 | ||
217 | #endif |