]>
Commit | Line | Data |
---|---|---|
87d546d8 TG |
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 | /* | |
22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. | |
23 | * Copyright (c) 2011, 2014 by Delphix. All rights reserved. | |
24 | */ | |
25 | ||
26 | #include <sys/zfs_context.h> | |
27 | #include <sys/spa.h> | |
28 | #include <sys/spa_impl.h> | |
29 | #include <sys/vdev_file.h> | |
30 | #include <sys/vdev_impl.h> | |
31 | #include <sys/zio.h> | |
32 | #include <sys/fs/zfs.h> | |
33 | #include <sys/fm/fs/zfs.h> | |
34 | ||
35 | /* | |
36 | * Virtual device vector for files. | |
37 | */ | |
38 | ||
39 | static void | |
40 | vdev_file_hold(vdev_t *vd) | |
41 | { | |
42 | ASSERT(vd->vdev_path != NULL); | |
43 | } | |
44 | ||
45 | static void | |
46 | vdev_file_rele(vdev_t *vd) | |
47 | { | |
48 | ASSERT(vd->vdev_path != NULL); | |
49 | } | |
50 | ||
51 | static int | |
52 | vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, | |
53 | uint64_t *ashift) | |
54 | { | |
55 | vdev_file_t *vf; | |
56 | vnode_t *vp; | |
57 | vattr_t vattr; | |
58 | int error; | |
59 | ||
60 | /* Rotational optimizations only make sense on block devices */ | |
61 | vd->vdev_nonrot = B_TRUE; | |
62 | ||
63 | /* | |
64 | * We must have a pathname, and it must be absolute. | |
65 | */ | |
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)); | |
69 | } | |
70 | ||
71 | /* | |
72 | * Reopen the device if it's not currently open. Otherwise, | |
73 | * just update the physical size of the device. | |
74 | */ | |
75 | if (vd->vdev_tsd != NULL) { | |
76 | ASSERT(vd->vdev_reopening); | |
77 | vf = vd->vdev_tsd; | |
78 | goto skip_open; | |
79 | } | |
80 | ||
81 | vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP); | |
82 | ||
83 | /* | |
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. | |
88 | */ | |
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); | |
92 | ||
93 | if (error) { | |
94 | vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
95 | return (error); | |
96 | } | |
97 | ||
98 | vf->vf_vnode = vp; | |
99 | ||
100 | #ifdef _KERNEL | |
101 | /* | |
102 | * Make sure it's a regular file. | |
103 | */ | |
104 | if (vp->v_type != VREG) { | |
105 | vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
106 | return (SET_ERROR(ENODEV)); | |
107 | } | |
108 | #endif | |
109 | ||
110 | skip_open: | |
111 | /* | |
112 | * Determine the physical size of the file. | |
113 | */ | |
114 | vattr.va_mask = AT_SIZE; | |
115 | error = VOP_GETATTR(vf->vf_vnode, &vattr, 0, kcred, NULL); | |
116 | if (error) { | |
117 | vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
118 | return (error); | |
119 | } | |
120 | ||
121 | *max_psize = *psize = vattr.va_size; | |
122 | *ashift = SPA_MINBLOCKSHIFT; | |
123 | ||
124 | return (0); | |
125 | } | |
126 | ||
127 | static void | |
128 | vdev_file_close(vdev_t *vd) | |
129 | { | |
130 | vdev_file_t *vf = vd->vdev_tsd; | |
131 | ||
132 | if (vd->vdev_reopening || vf == NULL) | |
133 | return; | |
134 | ||
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, | |
138 | kcred, NULL); | |
139 | } | |
140 | ||
141 | vd->vdev_delayed_close = B_FALSE; | |
142 | kmem_free(vf, sizeof (vdev_file_t)); | |
143 | vd->vdev_tsd = NULL; | |
144 | } | |
145 | ||
146 | static void | |
147 | vdev_file_io_strategy(void *arg) | |
148 | { | |
149 | zio_t *zio = (zio_t *)arg; | |
150 | vdev_t *vd = zio->io_vd; | |
151 | vdev_file_t *vf = vd->vdev_tsd; | |
152 | ssize_t resid; | |
153 | ||
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); | |
158 | ||
159 | if (resid != 0 && zio->io_error == 0) | |
160 | zio->io_error = SET_ERROR(ENOSPC); | |
161 | ||
162 | zio_interrupt(zio); | |
163 | } | |
164 | ||
165 | static void | |
166 | vdev_file_io_fsync(void *arg) | |
167 | { | |
168 | zio_t *zio = (zio_t *)arg; | |
169 | vdev_file_t *vf = zio->io_vd->vdev_tsd; | |
170 | ||
171 | zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC, kcred, NULL); | |
172 | ||
173 | zio_interrupt(zio); | |
174 | } | |
175 | ||
176 | static void | |
177 | vdev_file_io_start(zio_t *zio) | |
178 | { | |
179 | vdev_t *vd = zio->io_vd; | |
180 | vdev_file_t *vf = vd->vdev_tsd; | |
181 | ||
182 | if (zio->io_type == ZIO_TYPE_IOCTL) { | |
183 | /* XXPOLICY */ | |
184 | if (!vdev_readable(vd)) { | |
185 | zio->io_error = SET_ERROR(ENXIO); | |
186 | zio_interrupt(zio); | |
187 | return; | |
188 | } | |
189 | ||
190 | switch (zio->io_cmd) { | |
191 | case DKIOCFLUSHWRITECACHE: | |
192 | ||
193 | if (zfs_nocacheflush) | |
194 | break; | |
195 | ||
196 | /* | |
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. | |
202 | */ | |
5b5f25ca | 203 | if (spl_fstrans_check()) { |
87d546d8 TG |
204 | VERIFY3U(taskq_dispatch(system_taskq, |
205 | vdev_file_io_fsync, zio, TQ_SLEEP), !=, 0); | |
206 | return; | |
207 | } | |
208 | ||
209 | zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC, | |
210 | kcred, NULL); | |
211 | break; | |
212 | default: | |
213 | zio->io_error = SET_ERROR(ENOTSUP); | |
214 | } | |
215 | ||
216 | zio_execute(zio); | |
217 | return; | |
218 | } | |
219 | ||
220 | VERIFY3U(taskq_dispatch(system_taskq, vdev_file_io_strategy, zio, | |
221 | TQ_SLEEP), !=, 0); | |
222 | } | |
223 | ||
224 | /* ARGSUSED */ | |
225 | static void | |
226 | vdev_file_io_done(zio_t *zio) | |
227 | { | |
228 | } | |
229 | ||
230 | vdev_ops_t vdev_file_ops = { | |
231 | vdev_file_open, | |
232 | vdev_file_close, | |
233 | vdev_default_asize, | |
234 | vdev_file_io_start, | |
235 | vdev_file_io_done, | |
236 | NULL, | |
237 | vdev_file_hold, | |
238 | vdev_file_rele, | |
239 | VDEV_TYPE_FILE, /* name of this vdev type */ | |
240 | B_TRUE /* leaf vdev */ | |
241 | }; | |
242 | ||
243 | /* | |
244 | * From userland we access disks just like files. | |
245 | */ | |
246 | #ifndef _KERNEL | |
247 | ||
248 | vdev_ops_t vdev_disk_ops = { | |
249 | vdev_file_open, | |
250 | vdev_file_close, | |
251 | vdev_default_asize, | |
252 | vdev_file_io_start, | |
253 | vdev_file_io_done, | |
254 | NULL, | |
255 | vdev_file_hold, | |
256 | vdev_file_rele, | |
257 | VDEV_TYPE_DISK, /* name of this vdev type */ | |
258 | B_TRUE /* leaf vdev */ | |
259 | }; | |
260 | ||
261 | #endif |