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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. |
619f0976 | 23 | * Copyright (c) 2011, 2016 by Delphix. All rights reserved. |
34dc7c2f BB |
24 | */ |
25 | ||
34dc7c2f BB |
26 | #include <sys/zfs_context.h> |
27 | #include <sys/spa.h> | |
5853fe79 | 28 | #include <sys/spa_impl.h> |
34dc7c2f BB |
29 | #include <sys/vdev_file.h> |
30 | #include <sys/vdev_impl.h> | |
1b939560 | 31 | #include <sys/vdev_trim.h> |
34dc7c2f BB |
32 | #include <sys/zio.h> |
33 | #include <sys/fs/zfs.h> | |
b128c09f | 34 | #include <sys/fm/fs/zfs.h> |
a6255b7f | 35 | #include <sys/abd.h> |
1b939560 BB |
36 | #include <sys/fcntl.h> |
37 | #include <sys/vnode.h> | |
34dc7c2f BB |
38 | |
39 | /* | |
40 | * Virtual device vector for files. | |
41 | */ | |
42 | ||
da8f51e1 CC |
43 | static taskq_t *vdev_file_taskq; |
44 | ||
428870ff BB |
45 | static void |
46 | vdev_file_hold(vdev_t *vd) | |
47 | { | |
48 | ASSERT(vd->vdev_path != NULL); | |
49 | } | |
50 | ||
51 | static void | |
52 | vdev_file_rele(vdev_t *vd) | |
53 | { | |
54 | ASSERT(vd->vdev_path != NULL); | |
55 | } | |
56 | ||
34dc7c2f | 57 | static int |
1bd201e7 CS |
58 | vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, |
59 | uint64_t *ashift) | |
34dc7c2f BB |
60 | { |
61 | vdev_file_t *vf; | |
62 | vnode_t *vp; | |
b128c09f | 63 | vattr_t vattr; |
34dc7c2f BB |
64 | int error; |
65 | ||
1b939560 BB |
66 | /* |
67 | * Rotational optimizations only make sense on block devices. | |
68 | */ | |
fb40095f RY |
69 | vd->vdev_nonrot = B_TRUE; |
70 | ||
1b939560 BB |
71 | /* |
72 | * Allow TRIM on file based vdevs. This may not always be supported, | |
73 | * since it depends on your kernel version and underlying filesystem | |
74 | * type but it is always safe to attempt. | |
75 | */ | |
76 | vd->vdev_has_trim = B_TRUE; | |
77 | ||
78 | /* | |
79 | * Disable secure TRIM on file based vdevs. There is no way to | |
80 | * request this behavior from the underlying filesystem. | |
81 | */ | |
82 | vd->vdev_has_securetrim = B_FALSE; | |
83 | ||
34dc7c2f BB |
84 | /* |
85 | * We must have a pathname, and it must be absolute. | |
86 | */ | |
87 | if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { | |
88 | vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; | |
2e528b49 | 89 | return (SET_ERROR(EINVAL)); |
34dc7c2f BB |
90 | } |
91 | ||
428870ff BB |
92 | /* |
93 | * Reopen the device if it's not currently open. Otherwise, | |
94 | * just update the physical size of the device. | |
95 | */ | |
96 | if (vd->vdev_tsd != NULL) { | |
97 | ASSERT(vd->vdev_reopening); | |
98 | vf = vd->vdev_tsd; | |
99 | goto skip_open; | |
100 | } | |
101 | ||
79c76d5b | 102 | vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP); |
34dc7c2f BB |
103 | |
104 | /* | |
105 | * We always open the files from the root of the global zone, even if | |
106 | * we're in a local zone. If the user has gotten to this point, the | |
107 | * administrator has already decided that the pool should be available | |
108 | * to local zone users, so the underlying devices should be as well. | |
109 | */ | |
110 | ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/'); | |
111 | error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE, | |
fb5f0bc8 | 112 | spa_mode(vd->vdev_spa) | FOFFMAX, 0, &vp, 0, 0, rootdir, -1); |
34dc7c2f BB |
113 | |
114 | if (error) { | |
115 | vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
116 | return (error); | |
117 | } | |
118 | ||
119 | vf->vf_vnode = vp; | |
120 | ||
121 | #ifdef _KERNEL | |
122 | /* | |
123 | * Make sure it's a regular file. | |
124 | */ | |
125 | if (vp->v_type != VREG) { | |
126 | vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
2e528b49 | 127 | return (SET_ERROR(ENODEV)); |
34dc7c2f BB |
128 | } |
129 | #endif | |
428870ff BB |
130 | |
131 | skip_open: | |
34dc7c2f BB |
132 | /* |
133 | * Determine the physical size of the file. | |
134 | */ | |
135 | vattr.va_mask = AT_SIZE; | |
136 | error = VOP_GETATTR(vf->vf_vnode, &vattr, 0, kcred, NULL); | |
137 | if (error) { | |
138 | vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
139 | return (error); | |
140 | } | |
141 | ||
1bd201e7 | 142 | *max_psize = *psize = vattr.va_size; |
34dc7c2f BB |
143 | *ashift = SPA_MINBLOCKSHIFT; |
144 | ||
145 | return (0); | |
146 | } | |
147 | ||
148 | static void | |
149 | vdev_file_close(vdev_t *vd) | |
150 | { | |
151 | vdev_file_t *vf = vd->vdev_tsd; | |
152 | ||
428870ff | 153 | if (vd->vdev_reopening || vf == NULL) |
34dc7c2f BB |
154 | return; |
155 | ||
156 | if (vf->vf_vnode != NULL) { | |
157 | (void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL); | |
fb5f0bc8 BB |
158 | (void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0, |
159 | kcred, NULL); | |
34dc7c2f BB |
160 | } |
161 | ||
428870ff | 162 | vd->vdev_delayed_close = B_FALSE; |
34dc7c2f BB |
163 | kmem_free(vf, sizeof (vdev_file_t)); |
164 | vd->vdev_tsd = NULL; | |
165 | } | |
166 | ||
5853fe79 GW |
167 | static void |
168 | vdev_file_io_strategy(void *arg) | |
34dc7c2f | 169 | { |
5853fe79 | 170 | zio_t *zio = (zio_t *)arg; |
34dc7c2f | 171 | vdev_t *vd = zio->io_vd; |
5853fe79 GW |
172 | vdev_file_t *vf = vd->vdev_tsd; |
173 | ssize_t resid; | |
a6255b7f DQ |
174 | void *buf; |
175 | ||
176 | if (zio->io_type == ZIO_TYPE_READ) | |
177 | buf = abd_borrow_buf(zio->io_abd, zio->io_size); | |
178 | else | |
179 | buf = abd_borrow_buf_copy(zio->io_abd, zio->io_size); | |
34dc7c2f | 180 | |
5853fe79 | 181 | zio->io_error = vn_rdwr(zio->io_type == ZIO_TYPE_READ ? |
a6255b7f DQ |
182 | UIO_READ : UIO_WRITE, vf->vf_vnode, buf, zio->io_size, |
183 | zio->io_offset, UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, &resid); | |
184 | ||
185 | if (zio->io_type == ZIO_TYPE_READ) | |
186 | abd_return_buf_copy(zio->io_abd, buf, zio->io_size); | |
187 | else | |
188 | abd_return_buf(zio->io_abd, buf, zio->io_size); | |
5853fe79 GW |
189 | |
190 | if (resid != 0 && zio->io_error == 0) | |
2e528b49 | 191 | zio->io_error = SET_ERROR(ENOSPC); |
3adfc400 | 192 | |
26ef0cc7 | 193 | zio_delay_interrupt(zio); |
5853fe79 GW |
194 | } |
195 | ||
92119cc2 BB |
196 | static void |
197 | vdev_file_io_fsync(void *arg) | |
198 | { | |
199 | zio_t *zio = (zio_t *)arg; | |
200 | vdev_file_t *vf = zio->io_vd->vdev_tsd; | |
201 | ||
202 | zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC, kcred, NULL); | |
203 | ||
204 | zio_interrupt(zio); | |
205 | } | |
206 | ||
98b25418 | 207 | static void |
5853fe79 GW |
208 | vdev_file_io_start(zio_t *zio) |
209 | { | |
5853fe79 GW |
210 | vdev_t *vd = zio->io_vd; |
211 | vdev_file_t *vf = vd->vdev_tsd; | |
34dc7c2f | 212 | |
3adfc400 | 213 | if (zio->io_type == ZIO_TYPE_IOCTL) { |
5853fe79 GW |
214 | /* XXPOLICY */ |
215 | if (!vdev_readable(vd)) { | |
2e528b49 | 216 | zio->io_error = SET_ERROR(ENXIO); |
98b25418 GW |
217 | zio_interrupt(zio); |
218 | return; | |
5853fe79 GW |
219 | } |
220 | ||
34dc7c2f BB |
221 | switch (zio->io_cmd) { |
222 | case DKIOCFLUSHWRITECACHE: | |
f9a1ac4d H |
223 | |
224 | if (zfs_nocacheflush) | |
225 | break; | |
226 | ||
92119cc2 BB |
227 | /* |
228 | * We cannot safely call vfs_fsync() when PF_FSTRANS | |
229 | * is set in the current context. Filesystems like | |
230 | * XFS include sanity checks to verify it is not | |
231 | * already set, see xfs_vm_writepage(). Therefore | |
232 | * the sync must be dispatched to a different context. | |
233 | */ | |
e624cd19 | 234 | if (__spl_pf_fstrans_check()) { |
da8f51e1 | 235 | VERIFY3U(taskq_dispatch(vdev_file_taskq, |
48d3eb40 BB |
236 | vdev_file_io_fsync, zio, TQ_SLEEP), !=, |
237 | TASKQID_INVALID); | |
98b25418 | 238 | return; |
92119cc2 BB |
239 | } |
240 | ||
34dc7c2f BB |
241 | zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC, |
242 | kcred, NULL); | |
34dc7c2f BB |
243 | break; |
244 | default: | |
2e528b49 | 245 | zio->io_error = SET_ERROR(ENOTSUP); |
34dc7c2f BB |
246 | } |
247 | ||
1b939560 BB |
248 | zio_execute(zio); |
249 | return; | |
250 | } else if (zio->io_type == ZIO_TYPE_TRIM) { | |
251 | struct flock flck; | |
252 | ||
253 | ASSERT3U(zio->io_size, !=, 0); | |
254 | bzero(&flck, sizeof (flck)); | |
255 | flck.l_type = F_FREESP; | |
256 | flck.l_start = zio->io_offset; | |
257 | flck.l_len = zio->io_size; | |
126d0fa7 | 258 | flck.l_whence = SEEK_SET; |
1b939560 BB |
259 | |
260 | zio->io_error = VOP_SPACE(vf->vf_vnode, F_FREESP, &flck, | |
261 | 0, 0, kcred, NULL); | |
262 | ||
98b25418 GW |
263 | zio_execute(zio); |
264 | return; | |
34dc7c2f BB |
265 | } |
266 | ||
26ef0cc7 TH |
267 | zio->io_target_timestamp = zio_handle_io_delay(zio); |
268 | ||
da8f51e1 | 269 | VERIFY3U(taskq_dispatch(vdev_file_taskq, vdev_file_io_strategy, zio, |
48d3eb40 | 270 | TQ_SLEEP), !=, TASKQID_INVALID); |
34dc7c2f BB |
271 | } |
272 | ||
b128c09f BB |
273 | /* ARGSUSED */ |
274 | static void | |
34dc7c2f BB |
275 | vdev_file_io_done(zio_t *zio) |
276 | { | |
34dc7c2f BB |
277 | } |
278 | ||
279 | vdev_ops_t vdev_file_ops = { | |
a64f8276 I |
280 | .vdev_op_open = vdev_file_open, |
281 | .vdev_op_close = vdev_file_close, | |
282 | .vdev_op_asize = vdev_default_asize, | |
283 | .vdev_op_io_start = vdev_file_io_start, | |
284 | .vdev_op_io_done = vdev_file_io_done, | |
285 | .vdev_op_state_change = NULL, | |
286 | .vdev_op_need_resilver = NULL, | |
287 | .vdev_op_hold = vdev_file_hold, | |
288 | .vdev_op_rele = vdev_file_rele, | |
289 | .vdev_op_remap = NULL, | |
290 | .vdev_op_xlate = vdev_default_xlate, | |
291 | .vdev_op_type = VDEV_TYPE_FILE, /* name of this vdev type */ | |
292 | .vdev_op_leaf = B_TRUE /* leaf vdev */ | |
34dc7c2f BB |
293 | }; |
294 | ||
da8f51e1 CC |
295 | void |
296 | vdev_file_init(void) | |
297 | { | |
298 | vdev_file_taskq = taskq_create("z_vdev_file", MAX(boot_ncpus, 16), | |
299 | minclsyspri, boot_ncpus, INT_MAX, TASKQ_DYNAMIC); | |
300 | ||
301 | VERIFY(vdev_file_taskq); | |
302 | } | |
303 | ||
304 | void | |
305 | vdev_file_fini(void) | |
306 | { | |
307 | taskq_destroy(vdev_file_taskq); | |
308 | } | |
309 | ||
34dc7c2f BB |
310 | /* |
311 | * From userland we access disks just like files. | |
312 | */ | |
313 | #ifndef _KERNEL | |
314 | ||
315 | vdev_ops_t vdev_disk_ops = { | |
a64f8276 I |
316 | .vdev_op_open = vdev_file_open, |
317 | .vdev_op_close = vdev_file_close, | |
318 | .vdev_op_asize = vdev_default_asize, | |
319 | .vdev_op_io_start = vdev_file_io_start, | |
320 | .vdev_op_io_done = vdev_file_io_done, | |
321 | .vdev_op_state_change = NULL, | |
322 | .vdev_op_need_resilver = NULL, | |
323 | .vdev_op_hold = vdev_file_hold, | |
324 | .vdev_op_rele = vdev_file_rele, | |
325 | .vdev_op_remap = NULL, | |
326 | .vdev_op_xlate = vdev_default_xlate, | |
327 | .vdev_op_type = VDEV_TYPE_DISK, /* name of this vdev type */ | |
328 | .vdev_op_leaf = B_TRUE /* leaf vdev */ | |
34dc7c2f BB |
329 | }; |
330 | ||
331 | #endif |