Mercurial > illumos > illumos-gate
annotate usr/src/uts/common/fs/zfs/vdev_file.c @ 13971:d1648d817bd6
3581 spa_zio_taskq[ZIO_TYPE_FREE][ZIO_TASKQ_ISSUE]->tq_lock is piping hot
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Gordon Ross <gordon.ross@nexenta.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
| author | Adam Leventhal <ahl@delphix.com> |
|---|---|
| date | Mon, 25 Feb 2013 21:41:47 -0800 |
| parents | a9c12c2c1647 |
| children | d7059eb1884c |
| rev | line source |
|---|---|
| 789 | 1 /* |
| 2 * CDDL HEADER START | |
| 3 * | |
| 4 * The contents of this file are subject to the terms of the | |
| 1544 | 5 * Common Development and Distribution License (the "License"). |
| 6 * You may not use this file except in compliance with the License. | |
| 789 | 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 /* | |
|
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22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
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23 * Copyright (c) 2012 by Delphix. All rights reserved. |
| 789 | 24 */ |
| 25 | |
| 26 #include <sys/zfs_context.h> | |
| 27 #include <sys/spa.h> | |
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28 #include <sys/spa_impl.h> |
| 789 | 29 #include <sys/vdev_file.h> |
| 30 #include <sys/vdev_impl.h> | |
| 31 #include <sys/zio.h> | |
| 32 #include <sys/fs/zfs.h> | |
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33 #include <sys/fm/fs/zfs.h> |
| 789 | 34 |
| 35 /* | |
| 36 * Virtual device vector for files. | |
| 37 */ | |
| 38 | |
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39 static void |
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40 vdev_file_hold(vdev_t *vd) |
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41 { |
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42 ASSERT(vd->vdev_path != NULL); |
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43 } |
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44 |
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45 static void |
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46 vdev_file_rele(vdev_t *vd) |
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47 { |
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48 ASSERT(vd->vdev_path != NULL); |
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49 } |
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50 |
| 789 | 51 static int |
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52 vdev_file_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, |
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53 uint64_t *ashift) |
| 789 | 54 { |
| 55 vdev_file_t *vf; | |
| 56 vnode_t *vp; | |
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57 vattr_t vattr; |
| 789 | 58 int error; |
| 59 | |
| 60 /* | |
| 61 * We must have a pathname, and it must be absolute. | |
| 62 */ | |
| 63 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { | |
| 64 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; | |
| 65 return (EINVAL); | |
| 66 } | |
| 67 | |
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68 /* |
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69 * Reopen the device if it's not currently open. Otherwise, |
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70 * just update the physical size of the device. |
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71 */ |
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72 if (vd->vdev_tsd != NULL) { |
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73 ASSERT(vd->vdev_reopening); |
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74 vf = vd->vdev_tsd; |
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75 goto skip_open; |
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76 } |
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77 |
| 789 | 78 vf = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_file_t), KM_SLEEP); |
| 79 | |
| 80 /* | |
| 81 * We always open the files from the root of the global zone, even if | |
| 82 * we're in a local zone. If the user has gotten to this point, the | |
| 83 * administrator has already decided that the pool should be available | |
| 84 * to local zone users, so the underlying devices should be as well. | |
| 85 */ | |
| 86 ASSERT(vd->vdev_path != NULL && vd->vdev_path[0] == '/'); | |
| 5329 | 87 error = vn_openat(vd->vdev_path + 1, UIO_SYSSPACE, |
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88 spa_mode(vd->vdev_spa) | FOFFMAX, 0, &vp, 0, 0, rootdir, -1); |
| 789 | 89 |
| 90 if (error) { | |
| 91 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
| 92 return (error); | |
| 93 } | |
| 94 | |
| 95 vf->vf_vnode = vp; | |
| 96 | |
| 97 #ifdef _KERNEL | |
| 98 /* | |
| 99 * Make sure it's a regular file. | |
| 100 */ | |
| 101 if (vp->v_type != VREG) { | |
| 102 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
| 103 return (ENODEV); | |
| 104 } | |
| 105 #endif | |
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106 |
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107 skip_open: |
| 789 | 108 /* |
| 109 * Determine the physical size of the file. | |
| 110 */ | |
| 111 vattr.va_mask = AT_SIZE; | |
| 5331 | 112 error = VOP_GETATTR(vf->vf_vnode, &vattr, 0, kcred, NULL); |
| 789 | 113 if (error) { |
| 114 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; | |
| 115 return (error); | |
| 116 } | |
| 117 | |
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118 *max_psize = *psize = vattr.va_size; |
| 789 | 119 *ashift = SPA_MINBLOCKSHIFT; |
| 120 | |
| 121 return (0); | |
| 122 } | |
| 123 | |
| 124 static void | |
| 125 vdev_file_close(vdev_t *vd) | |
| 126 { | |
| 127 vdev_file_t *vf = vd->vdev_tsd; | |
| 128 | |
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129 if (vd->vdev_reopening || vf == NULL) |
| 789 | 130 return; |
| 131 | |
| 132 if (vf->vf_vnode != NULL) { | |
| 5331 | 133 (void) VOP_PUTPAGE(vf->vf_vnode, 0, 0, B_INVAL, kcred, NULL); |
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134 (void) VOP_CLOSE(vf->vf_vnode, spa_mode(vd->vdev_spa), 1, 0, |
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135 kcred, NULL); |
| 789 | 136 VN_RELE(vf->vf_vnode); |
| 137 } | |
| 138 | |
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139 vd->vdev_delayed_close = B_FALSE; |
| 789 | 140 kmem_free(vf, sizeof (vdev_file_t)); |
| 141 vd->vdev_tsd = NULL; | |
| 142 } | |
| 143 | |
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144 /* |
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145 * Implements the interrupt side for file vdev types. This routine will be |
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146 * called when the I/O completes allowing us to transfer the I/O to the |
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147 * interrupt taskqs. For consistency, the code structure mimics disk vdev |
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148 * types. |
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149 */ |
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150 static void |
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151 vdev_file_io_intr(buf_t *bp) |
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152 { |
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153 vdev_buf_t *vb = (vdev_buf_t *)bp; |
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154 zio_t *zio = vb->vb_io; |
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155 |
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156 zio->io_error = (geterror(bp) != 0 ? EIO : 0); |
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157 if (zio->io_error == 0 && bp->b_resid != 0) |
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158 zio->io_error = ENOSPC; |
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159 |
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160 kmem_free(vb, sizeof (vdev_buf_t)); |
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161 zio_interrupt(zio); |
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162 } |
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163 |
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164 static void |
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165 vdev_file_io_strategy(void *arg) |
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166 { |
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167 buf_t *bp = arg; |
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168 vnode_t *vp = bp->b_private; |
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169 ssize_t resid; |
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170 int error; |
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171 |
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172 error = vn_rdwr((bp->b_flags & B_READ) ? UIO_READ : UIO_WRITE, |
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173 vp, bp->b_un.b_addr, bp->b_bcount, ldbtob(bp->b_lblkno), |
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174 UIO_SYSSPACE, 0, RLIM64_INFINITY, kcred, &resid); |
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175 |
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176 if (error == 0) { |
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177 bp->b_resid = resid; |
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178 biodone(bp); |
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179 } else { |
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180 bioerror(bp, error); |
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181 biodone(bp); |
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182 } |
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183 } |
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184 |
| 5329 | 185 static int |
| 789 | 186 vdev_file_io_start(zio_t *zio) |
| 187 { | |
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188 spa_t *spa = zio->io_spa; |
| 789 | 189 vdev_t *vd = zio->io_vd; |
| 190 vdev_file_t *vf = vd->vdev_tsd; | |
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191 vdev_buf_t *vb; |
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192 buf_t *bp; |
| 789 | 193 |
| 194 if (zio->io_type == ZIO_TYPE_IOCTL) { | |
| 195 /* XXPOLICY */ | |
| 5329 | 196 if (!vdev_readable(vd)) { |
| 789 | 197 zio->io_error = ENXIO; |
| 5530 | 198 return (ZIO_PIPELINE_CONTINUE); |
| 789 | 199 } |
| 200 | |
| 201 switch (zio->io_cmd) { | |
| 202 case DKIOCFLUSHWRITECACHE: | |
| 203 zio->io_error = VOP_FSYNC(vf->vf_vnode, FSYNC | FDSYNC, | |
| 5331 | 204 kcred, NULL); |
| 789 | 205 break; |
| 206 default: | |
| 207 zio->io_error = ENOTSUP; | |
| 208 } | |
| 209 | |
| 5530 | 210 return (ZIO_PIPELINE_CONTINUE); |
| 789 | 211 } |
| 212 | |
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213 vb = kmem_alloc(sizeof (vdev_buf_t), KM_SLEEP); |
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214 |
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215 vb->vb_io = zio; |
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216 bp = &vb->vb_buf; |
| 789 | 217 |
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218 bioinit(bp); |
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219 bp->b_flags = (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE); |
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220 bp->b_bcount = zio->io_size; |
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221 bp->b_un.b_addr = zio->io_data; |
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222 bp->b_lblkno = lbtodb(zio->io_offset); |
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223 bp->b_bufsize = zio->io_size; |
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224 bp->b_private = vf->vf_vnode; |
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225 bp->b_iodone = (int (*)())vdev_file_io_intr; |
| 789 | 226 |
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227 spa_taskq_dispatch_ent(spa, ZIO_TYPE_FREE, ZIO_TASKQ_ISSUE, |
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228 vdev_file_io_strategy, bp, 0, &zio->io_tqent); |
| 5530 | 229 |
| 230 return (ZIO_PIPELINE_STOP); | |
| 789 | 231 } |
| 232 | |
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233 /* ARGSUSED */ |
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234 static void |
| 789 | 235 vdev_file_io_done(zio_t *zio) |
| 236 { | |
| 237 } | |
| 238 | |
| 239 vdev_ops_t vdev_file_ops = { | |
| 240 vdev_file_open, | |
| 241 vdev_file_close, | |
| 242 vdev_default_asize, | |
| 243 vdev_file_io_start, | |
| 244 vdev_file_io_done, | |
| 245 NULL, | |
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246 vdev_file_hold, |
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247 vdev_file_rele, |
| 789 | 248 VDEV_TYPE_FILE, /* name of this vdev type */ |
| 249 B_TRUE /* leaf vdev */ | |
| 250 }; | |
| 251 | |
| 252 /* | |
| 253 * From userland we access disks just like files. | |
| 254 */ | |
| 255 #ifndef _KERNEL | |
| 256 | |
| 257 vdev_ops_t vdev_disk_ops = { | |
| 258 vdev_file_open, | |
| 259 vdev_file_close, | |
| 260 vdev_default_asize, | |
| 261 vdev_file_io_start, | |
| 262 vdev_file_io_done, | |
| 263 NULL, | |
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264 vdev_file_hold, |
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265 vdev_file_rele, |
| 789 | 266 VDEV_TYPE_DISK, /* name of this vdev type */ |
| 267 B_TRUE /* leaf vdev */ | |
| 268 }; | |
| 269 | |
| 270 #endif |