1 | #include <machine/rtems-bsd-kernel-space.h> |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 2000-2004 |
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5 | * Poul-Henning Kamp. All rights reserved. |
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6 | * Copyright (c) 1989, 1992-1993, 1995 |
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7 | * The Regents of the University of California. All rights reserved. |
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8 | * |
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9 | * This code is derived from software donated to Berkeley by |
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10 | * Jan-Simon Pendry. |
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11 | * |
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12 | * Redistribution and use in source and binary forms, with or without |
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13 | * modification, are permitted provided that the following conditions |
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14 | * are met: |
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15 | * 1. Redistributions of source code must retain the above copyright |
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16 | * notice, this list of conditions and the following disclaimer. |
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17 | * 2. Neither the name of the University nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | * |
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33 | * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95 |
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34 | * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43 |
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35 | * |
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36 | * $FreeBSD$ |
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37 | */ |
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38 | |
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39 | /* |
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40 | * TODO: |
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41 | * mkdir: want it ? |
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42 | */ |
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43 | |
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44 | #include <rtems/bsd/sys/param.h> |
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45 | #include <sys/systm.h> |
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46 | #include <sys/conf.h> |
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47 | #include <sys/dirent.h> |
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48 | #include <sys/fcntl.h> |
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49 | #include <sys/file.h> |
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50 | #include <sys/filedesc.h> |
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51 | #include <sys/filio.h> |
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52 | #include <sys/jail.h> |
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53 | #include <sys/kernel.h> |
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54 | #include <rtems/bsd/sys/lock.h> |
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55 | #include <sys/malloc.h> |
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56 | #include <sys/mman.h> |
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57 | #include <sys/mount.h> |
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58 | #include <sys/namei.h> |
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59 | #include <sys/priv.h> |
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60 | #include <sys/proc.h> |
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61 | #include <sys/stat.h> |
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62 | #include <sys/sx.h> |
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63 | #include <sys/sysctl.h> |
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64 | #include <sys/time.h> |
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65 | #include <sys/ttycom.h> |
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66 | #include <rtems/bsd/sys/unistd.h> |
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67 | #include <sys/vnode.h> |
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68 | |
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69 | static struct vop_vector devfs_vnodeops; |
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70 | static struct vop_vector devfs_specops; |
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71 | static struct fileops devfs_ops_f; |
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72 | |
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73 | #include <fs/devfs/devfs.h> |
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74 | #include <fs/devfs/devfs_int.h> |
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75 | |
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76 | #include <security/mac/mac_framework.h> |
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77 | |
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78 | #include <vm/vm.h> |
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79 | #include <vm/vm_extern.h> |
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80 | #include <vm/vm_object.h> |
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81 | |
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82 | static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); |
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83 | |
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84 | struct mtx devfs_de_interlock; |
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85 | MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); |
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86 | struct sx clone_drain_lock; |
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87 | SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock"); |
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88 | struct mtx cdevpriv_mtx; |
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89 | MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF); |
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90 | |
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91 | SYSCTL_DECL(_vfs_devfs); |
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92 | |
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93 | static int devfs_dotimes; |
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94 | SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW, |
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95 | &devfs_dotimes, 0, "Update timestamps on DEVFS with default precision"); |
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96 | |
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97 | /* |
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98 | * Update devfs node timestamp. Note that updates are unlocked and |
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99 | * stat(2) could see partially updated times. |
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100 | */ |
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101 | static void |
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102 | devfs_timestamp(struct timespec *tsp) |
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103 | { |
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104 | time_t ts; |
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105 | |
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106 | if (devfs_dotimes) { |
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107 | vfs_timestamp(tsp); |
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108 | } else { |
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109 | ts = time_second; |
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110 | if (tsp->tv_sec != ts) { |
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111 | tsp->tv_sec = ts; |
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112 | tsp->tv_nsec = 0; |
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113 | } |
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114 | } |
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115 | } |
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116 | |
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117 | static int |
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118 | devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp, |
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119 | int *ref) |
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120 | { |
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121 | |
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122 | *dswp = devvn_refthread(fp->f_vnode, devp, ref); |
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123 | if (*devp != fp->f_data) { |
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124 | if (*dswp != NULL) |
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125 | dev_relthread(*devp, *ref); |
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126 | return (ENXIO); |
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127 | } |
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128 | KASSERT((*devp)->si_refcount > 0, |
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129 | ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); |
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130 | if (*dswp == NULL) |
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131 | return (ENXIO); |
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132 | curthread->td_fpop = fp; |
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133 | return (0); |
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134 | } |
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135 | |
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136 | int |
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137 | devfs_get_cdevpriv(void **datap) |
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138 | { |
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139 | struct file *fp; |
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140 | struct cdev_privdata *p; |
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141 | int error; |
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142 | |
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143 | fp = curthread->td_fpop; |
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144 | if (fp == NULL) |
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145 | return (EBADF); |
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146 | p = fp->f_cdevpriv; |
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147 | if (p != NULL) { |
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148 | error = 0; |
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149 | *datap = p->cdpd_data; |
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150 | } else |
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151 | error = ENOENT; |
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152 | return (error); |
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153 | } |
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154 | |
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155 | int |
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156 | devfs_set_cdevpriv(void *priv, d_priv_dtor_t *priv_dtr) |
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157 | { |
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158 | struct file *fp; |
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159 | struct cdev_priv *cdp; |
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160 | struct cdev_privdata *p; |
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161 | int error; |
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162 | |
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163 | fp = curthread->td_fpop; |
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164 | if (fp == NULL) |
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165 | return (ENOENT); |
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166 | cdp = cdev2priv((struct cdev *)fp->f_data); |
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167 | p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK); |
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168 | p->cdpd_data = priv; |
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169 | p->cdpd_dtr = priv_dtr; |
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170 | p->cdpd_fp = fp; |
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171 | mtx_lock(&cdevpriv_mtx); |
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172 | if (fp->f_cdevpriv == NULL) { |
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173 | LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list); |
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174 | fp->f_cdevpriv = p; |
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175 | mtx_unlock(&cdevpriv_mtx); |
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176 | error = 0; |
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177 | } else { |
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178 | mtx_unlock(&cdevpriv_mtx); |
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179 | free(p, M_CDEVPDATA); |
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180 | error = EBUSY; |
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181 | } |
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182 | return (error); |
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183 | } |
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184 | |
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185 | void |
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186 | devfs_destroy_cdevpriv(struct cdev_privdata *p) |
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187 | { |
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188 | |
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189 | mtx_assert(&cdevpriv_mtx, MA_OWNED); |
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190 | KASSERT(p->cdpd_fp->f_cdevpriv == p, |
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191 | ("devfs_destoy_cdevpriv %p != %p", p->cdpd_fp->f_cdevpriv, p)); |
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192 | p->cdpd_fp->f_cdevpriv = NULL; |
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193 | LIST_REMOVE(p, cdpd_list); |
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194 | mtx_unlock(&cdevpriv_mtx); |
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195 | (p->cdpd_dtr)(p->cdpd_data); |
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196 | free(p, M_CDEVPDATA); |
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197 | } |
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198 | |
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199 | static void |
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200 | devfs_fpdrop(struct file *fp) |
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201 | { |
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202 | struct cdev_privdata *p; |
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203 | |
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204 | mtx_lock(&cdevpriv_mtx); |
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205 | if ((p = fp->f_cdevpriv) == NULL) { |
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206 | mtx_unlock(&cdevpriv_mtx); |
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207 | return; |
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208 | } |
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209 | devfs_destroy_cdevpriv(p); |
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210 | } |
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211 | |
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212 | void |
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213 | devfs_clear_cdevpriv(void) |
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214 | { |
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215 | struct file *fp; |
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216 | |
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217 | fp = curthread->td_fpop; |
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218 | if (fp == NULL) |
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219 | return; |
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220 | devfs_fpdrop(fp); |
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221 | } |
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222 | |
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223 | /* |
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224 | * On success devfs_populate_vp() returns with dmp->dm_lock held. |
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225 | */ |
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226 | static int |
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227 | devfs_populate_vp(struct vnode *vp) |
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228 | { |
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229 | struct devfs_dirent *de; |
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230 | struct devfs_mount *dmp; |
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231 | int locked; |
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232 | |
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233 | ASSERT_VOP_LOCKED(vp, "devfs_populate_vp"); |
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234 | |
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235 | dmp = VFSTODEVFS(vp->v_mount); |
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236 | locked = VOP_ISLOCKED(vp); |
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237 | |
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238 | sx_xlock(&dmp->dm_lock); |
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239 | DEVFS_DMP_HOLD(dmp); |
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240 | |
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241 | /* Can't call devfs_populate() with the vnode lock held. */ |
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242 | VOP_UNLOCK(vp, 0); |
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243 | devfs_populate(dmp); |
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244 | |
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245 | sx_xunlock(&dmp->dm_lock); |
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246 | vn_lock(vp, locked | LK_RETRY); |
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247 | sx_xlock(&dmp->dm_lock); |
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248 | if (DEVFS_DMP_DROP(dmp)) { |
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249 | sx_xunlock(&dmp->dm_lock); |
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250 | devfs_unmount_final(dmp); |
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251 | return (ERESTART); |
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252 | } |
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253 | if ((vp->v_iflag & VI_DOOMED) != 0) { |
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254 | sx_xunlock(&dmp->dm_lock); |
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255 | return (ERESTART); |
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256 | } |
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257 | de = vp->v_data; |
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258 | KASSERT(de != NULL, |
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259 | ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed")); |
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260 | if ((de->de_flags & DE_DOOMED) != 0) { |
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261 | sx_xunlock(&dmp->dm_lock); |
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262 | return (ERESTART); |
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263 | } |
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264 | |
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265 | return (0); |
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266 | } |
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267 | |
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268 | static int |
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269 | devfs_vptocnp(struct vop_vptocnp_args *ap) |
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270 | { |
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271 | struct vnode *vp = ap->a_vp; |
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272 | struct vnode **dvp = ap->a_vpp; |
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273 | struct devfs_mount *dmp; |
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274 | char *buf = ap->a_buf; |
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275 | int *buflen = ap->a_buflen; |
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276 | struct devfs_dirent *dd, *de; |
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277 | int i, error; |
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278 | |
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279 | dmp = VFSTODEVFS(vp->v_mount); |
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280 | |
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281 | error = devfs_populate_vp(vp); |
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282 | if (error != 0) |
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283 | return (error); |
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284 | |
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285 | i = *buflen; |
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286 | dd = vp->v_data; |
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287 | |
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288 | if (vp->v_type == VCHR) { |
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289 | i -= strlen(dd->de_cdp->cdp_c.si_name); |
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290 | if (i < 0) { |
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291 | error = ENOMEM; |
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292 | goto finished; |
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293 | } |
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294 | bcopy(dd->de_cdp->cdp_c.si_name, buf + i, |
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295 | strlen(dd->de_cdp->cdp_c.si_name)); |
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296 | de = dd->de_dir; |
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297 | } else if (vp->v_type == VDIR) { |
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298 | if (dd == dmp->dm_rootdir) { |
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299 | *dvp = vp; |
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300 | vref(*dvp); |
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301 | goto finished; |
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302 | } |
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303 | i -= dd->de_dirent->d_namlen; |
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304 | if (i < 0) { |
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305 | error = ENOMEM; |
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306 | goto finished; |
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307 | } |
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308 | bcopy(dd->de_dirent->d_name, buf + i, |
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309 | dd->de_dirent->d_namlen); |
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310 | de = dd; |
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311 | } else { |
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312 | error = ENOENT; |
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313 | goto finished; |
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314 | } |
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315 | *buflen = i; |
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316 | de = devfs_parent_dirent(de); |
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317 | if (de == NULL) { |
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318 | error = ENOENT; |
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319 | goto finished; |
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320 | } |
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321 | mtx_lock(&devfs_de_interlock); |
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322 | *dvp = de->de_vnode; |
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323 | if (*dvp != NULL) { |
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324 | VI_LOCK(*dvp); |
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325 | mtx_unlock(&devfs_de_interlock); |
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326 | vholdl(*dvp); |
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327 | VI_UNLOCK(*dvp); |
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328 | vref(*dvp); |
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329 | vdrop(*dvp); |
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330 | } else { |
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331 | mtx_unlock(&devfs_de_interlock); |
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332 | error = ENOENT; |
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333 | } |
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334 | finished: |
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335 | sx_xunlock(&dmp->dm_lock); |
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336 | return (error); |
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337 | } |
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338 | |
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339 | /* |
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340 | * Construct the fully qualified path name relative to the mountpoint. |
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341 | * If a NULL cnp is provided, no '/' is appended to the resulting path. |
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342 | */ |
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343 | char * |
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344 | devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd, |
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345 | struct componentname *cnp) |
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346 | { |
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347 | int i; |
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348 | struct devfs_dirent *de; |
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349 | |
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350 | sx_assert(&dmp->dm_lock, SA_LOCKED); |
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351 | |
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352 | i = SPECNAMELEN; |
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353 | buf[i] = '\0'; |
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354 | if (cnp != NULL) |
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355 | i -= cnp->cn_namelen; |
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356 | if (i < 0) |
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357 | return (NULL); |
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358 | if (cnp != NULL) |
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359 | bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); |
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360 | de = dd; |
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361 | while (de != dmp->dm_rootdir) { |
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362 | if (cnp != NULL || i < SPECNAMELEN) { |
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363 | i--; |
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364 | if (i < 0) |
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365 | return (NULL); |
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366 | buf[i] = '/'; |
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367 | } |
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368 | i -= de->de_dirent->d_namlen; |
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369 | if (i < 0) |
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370 | return (NULL); |
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371 | bcopy(de->de_dirent->d_name, buf + i, |
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372 | de->de_dirent->d_namlen); |
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373 | de = devfs_parent_dirent(de); |
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374 | if (de == NULL) |
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375 | return (NULL); |
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376 | } |
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377 | return (buf + i); |
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378 | } |
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379 | |
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380 | static int |
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381 | devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, |
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382 | struct devfs_dirent *de) |
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383 | { |
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384 | int not_found; |
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385 | |
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386 | not_found = 0; |
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387 | if (de->de_flags & DE_DOOMED) |
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388 | not_found = 1; |
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389 | if (DEVFS_DE_DROP(de)) { |
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390 | KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); |
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391 | devfs_dirent_free(de); |
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392 | } |
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393 | if (DEVFS_DMP_DROP(dmp)) { |
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394 | KASSERT(not_found == 1, |
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395 | ("DEVFS mount struct freed before dirent")); |
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396 | not_found = 2; |
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397 | sx_xunlock(&dmp->dm_lock); |
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398 | devfs_unmount_final(dmp); |
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399 | } |
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400 | if (not_found == 1 || (drop_dm_lock && not_found != 2)) |
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401 | sx_unlock(&dmp->dm_lock); |
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402 | return (not_found); |
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403 | } |
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404 | |
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405 | static void |
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406 | devfs_insmntque_dtr(struct vnode *vp, void *arg) |
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407 | { |
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408 | struct devfs_dirent *de; |
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409 | |
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410 | de = (struct devfs_dirent *)arg; |
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411 | mtx_lock(&devfs_de_interlock); |
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412 | vp->v_data = NULL; |
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413 | de->de_vnode = NULL; |
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414 | mtx_unlock(&devfs_de_interlock); |
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415 | vgone(vp); |
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416 | vput(vp); |
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417 | } |
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418 | |
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419 | /* |
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420 | * devfs_allocv shall be entered with dmp->dm_lock held, and it drops |
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421 | * it on return. |
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422 | */ |
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423 | int |
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424 | devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode, |
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425 | struct vnode **vpp) |
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426 | { |
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427 | int error; |
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428 | struct vnode *vp; |
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429 | struct cdev *dev; |
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430 | struct devfs_mount *dmp; |
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431 | struct cdevsw *dsw; |
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432 | |
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433 | dmp = VFSTODEVFS(mp); |
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434 | if (de->de_flags & DE_DOOMED) { |
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435 | sx_xunlock(&dmp->dm_lock); |
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436 | return (ENOENT); |
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437 | } |
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438 | loop: |
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439 | DEVFS_DE_HOLD(de); |
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440 | DEVFS_DMP_HOLD(dmp); |
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441 | mtx_lock(&devfs_de_interlock); |
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442 | vp = de->de_vnode; |
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443 | if (vp != NULL) { |
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444 | VI_LOCK(vp); |
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445 | mtx_unlock(&devfs_de_interlock); |
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446 | sx_xunlock(&dmp->dm_lock); |
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447 | vget(vp, lockmode | LK_INTERLOCK | LK_RETRY, curthread); |
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448 | sx_xlock(&dmp->dm_lock); |
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449 | if (devfs_allocv_drop_refs(0, dmp, de)) { |
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450 | vput(vp); |
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451 | return (ENOENT); |
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452 | } |
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453 | else if ((vp->v_iflag & VI_DOOMED) != 0) { |
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454 | mtx_lock(&devfs_de_interlock); |
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455 | if (de->de_vnode == vp) { |
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456 | de->de_vnode = NULL; |
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457 | vp->v_data = NULL; |
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458 | } |
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459 | mtx_unlock(&devfs_de_interlock); |
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460 | vput(vp); |
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461 | goto loop; |
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462 | } |
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463 | sx_xunlock(&dmp->dm_lock); |
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464 | *vpp = vp; |
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465 | return (0); |
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466 | } |
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467 | mtx_unlock(&devfs_de_interlock); |
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468 | if (de->de_dirent->d_type == DT_CHR) { |
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469 | if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { |
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470 | devfs_allocv_drop_refs(1, dmp, de); |
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471 | return (ENOENT); |
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472 | } |
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473 | dev = &de->de_cdp->cdp_c; |
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474 | } else { |
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475 | dev = NULL; |
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476 | } |
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477 | error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); |
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478 | if (error != 0) { |
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479 | devfs_allocv_drop_refs(1, dmp, de); |
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480 | printf("devfs_allocv: failed to allocate new vnode\n"); |
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481 | return (error); |
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482 | } |
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483 | |
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484 | if (de->de_dirent->d_type == DT_CHR) { |
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485 | vp->v_type = VCHR; |
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486 | VI_LOCK(vp); |
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487 | dev_lock(); |
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488 | dev_refl(dev); |
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489 | /* XXX: v_rdev should be protect by vnode lock */ |
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490 | vp->v_rdev = dev; |
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491 | KASSERT(vp->v_usecount == 1, |
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492 | ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount)); |
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493 | dev->si_usecount += vp->v_usecount; |
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494 | /* Special casing of ttys for deadfs. Probably redundant. */ |
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495 | dsw = dev->si_devsw; |
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496 | if (dsw != NULL && (dsw->d_flags & D_TTY) != 0) |
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497 | vp->v_vflag |= VV_ISTTY; |
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498 | dev_unlock(); |
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499 | VI_UNLOCK(vp); |
---|
500 | if ((dev->si_flags & SI_ETERNAL) != 0) |
---|
501 | vp->v_vflag |= VV_ETERNALDEV; |
---|
502 | vp->v_op = &devfs_specops; |
---|
503 | } else if (de->de_dirent->d_type == DT_DIR) { |
---|
504 | vp->v_type = VDIR; |
---|
505 | } else if (de->de_dirent->d_type == DT_LNK) { |
---|
506 | vp->v_type = VLNK; |
---|
507 | } else { |
---|
508 | vp->v_type = VBAD; |
---|
509 | } |
---|
510 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); |
---|
511 | VN_LOCK_ASHARE(vp); |
---|
512 | mtx_lock(&devfs_de_interlock); |
---|
513 | vp->v_data = de; |
---|
514 | de->de_vnode = vp; |
---|
515 | mtx_unlock(&devfs_de_interlock); |
---|
516 | error = insmntque1(vp, mp, devfs_insmntque_dtr, de); |
---|
517 | if (error != 0) { |
---|
518 | (void) devfs_allocv_drop_refs(1, dmp, de); |
---|
519 | return (error); |
---|
520 | } |
---|
521 | if (devfs_allocv_drop_refs(0, dmp, de)) { |
---|
522 | vput(vp); |
---|
523 | return (ENOENT); |
---|
524 | } |
---|
525 | #ifdef MAC |
---|
526 | mac_devfs_vnode_associate(mp, de, vp); |
---|
527 | #endif |
---|
528 | sx_xunlock(&dmp->dm_lock); |
---|
529 | *vpp = vp; |
---|
530 | return (0); |
---|
531 | } |
---|
532 | |
---|
533 | static int |
---|
534 | devfs_access(struct vop_access_args *ap) |
---|
535 | { |
---|
536 | struct vnode *vp = ap->a_vp; |
---|
537 | struct devfs_dirent *de; |
---|
538 | struct proc *p; |
---|
539 | int error; |
---|
540 | |
---|
541 | de = vp->v_data; |
---|
542 | if (vp->v_type == VDIR) |
---|
543 | de = de->de_dir; |
---|
544 | |
---|
545 | error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, |
---|
546 | ap->a_accmode, ap->a_cred, NULL); |
---|
547 | if (error == 0) |
---|
548 | return (0); |
---|
549 | if (error != EACCES) |
---|
550 | return (error); |
---|
551 | p = ap->a_td->td_proc; |
---|
552 | /* We do, however, allow access to the controlling terminal */ |
---|
553 | PROC_LOCK(p); |
---|
554 | if (!(p->p_flag & P_CONTROLT)) { |
---|
555 | PROC_UNLOCK(p); |
---|
556 | return (error); |
---|
557 | } |
---|
558 | if (p->p_session->s_ttydp == de->de_cdp) |
---|
559 | error = 0; |
---|
560 | PROC_UNLOCK(p); |
---|
561 | return (error); |
---|
562 | } |
---|
563 | |
---|
564 | _Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0, |
---|
565 | "devfs-only flag reuse failed"); |
---|
566 | |
---|
567 | static int |
---|
568 | devfs_close(struct vop_close_args *ap) |
---|
569 | { |
---|
570 | struct vnode *vp = ap->a_vp, *oldvp; |
---|
571 | struct thread *td = ap->a_td; |
---|
572 | struct proc *p; |
---|
573 | struct cdev *dev = vp->v_rdev; |
---|
574 | struct cdevsw *dsw; |
---|
575 | int dflags, error, ref, vp_locked; |
---|
576 | |
---|
577 | /* |
---|
578 | * XXX: Don't call d_close() if we were called because of |
---|
579 | * XXX: insmntque1() failure. |
---|
580 | */ |
---|
581 | if (vp->v_data == NULL) |
---|
582 | return (0); |
---|
583 | |
---|
584 | /* |
---|
585 | * Hack: a tty device that is a controlling terminal |
---|
586 | * has a reference from the session structure. |
---|
587 | * We cannot easily tell that a character device is |
---|
588 | * a controlling terminal, unless it is the closing |
---|
589 | * process' controlling terminal. In that case, |
---|
590 | * if the reference count is 2 (this last descriptor |
---|
591 | * plus the session), release the reference from the session. |
---|
592 | */ |
---|
593 | if (td != NULL) { |
---|
594 | p = td->td_proc; |
---|
595 | PROC_LOCK(p); |
---|
596 | if (vp == p->p_session->s_ttyvp) { |
---|
597 | PROC_UNLOCK(p); |
---|
598 | oldvp = NULL; |
---|
599 | sx_xlock(&proctree_lock); |
---|
600 | if (vp == p->p_session->s_ttyvp) { |
---|
601 | SESS_LOCK(p->p_session); |
---|
602 | VI_LOCK(vp); |
---|
603 | if (count_dev(dev) == 2 && |
---|
604 | (vp->v_iflag & VI_DOOMED) == 0) { |
---|
605 | p->p_session->s_ttyvp = NULL; |
---|
606 | p->p_session->s_ttydp = NULL; |
---|
607 | oldvp = vp; |
---|
608 | } |
---|
609 | VI_UNLOCK(vp); |
---|
610 | SESS_UNLOCK(p->p_session); |
---|
611 | } |
---|
612 | sx_xunlock(&proctree_lock); |
---|
613 | if (oldvp != NULL) |
---|
614 | vrele(oldvp); |
---|
615 | } else |
---|
616 | PROC_UNLOCK(p); |
---|
617 | } |
---|
618 | /* |
---|
619 | * We do not want to really close the device if it |
---|
620 | * is still in use unless we are trying to close it |
---|
621 | * forcibly. Since every use (buffer, vnode, swap, cmap) |
---|
622 | * holds a reference to the vnode, and because we mark |
---|
623 | * any other vnodes that alias this device, when the |
---|
624 | * sum of the reference counts on all the aliased |
---|
625 | * vnodes descends to one, we are on last close. |
---|
626 | */ |
---|
627 | dsw = dev_refthread(dev, &ref); |
---|
628 | if (dsw == NULL) |
---|
629 | return (ENXIO); |
---|
630 | dflags = 0; |
---|
631 | VI_LOCK(vp); |
---|
632 | if (vp->v_iflag & VI_DOOMED) { |
---|
633 | /* Forced close. */ |
---|
634 | dflags |= FREVOKE | FNONBLOCK; |
---|
635 | } else if (dsw->d_flags & D_TRACKCLOSE) { |
---|
636 | /* Keep device updated on status. */ |
---|
637 | } else if (count_dev(dev) > 1) { |
---|
638 | VI_UNLOCK(vp); |
---|
639 | dev_relthread(dev, ref); |
---|
640 | return (0); |
---|
641 | } |
---|
642 | if (count_dev(dev) == 1) |
---|
643 | dflags |= FLASTCLOSE; |
---|
644 | vholdl(vp); |
---|
645 | VI_UNLOCK(vp); |
---|
646 | vp_locked = VOP_ISLOCKED(vp); |
---|
647 | VOP_UNLOCK(vp, 0); |
---|
648 | KASSERT(dev->si_refcount > 0, |
---|
649 | ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); |
---|
650 | error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td); |
---|
651 | dev_relthread(dev, ref); |
---|
652 | vn_lock(vp, vp_locked | LK_RETRY); |
---|
653 | vdrop(vp); |
---|
654 | return (error); |
---|
655 | } |
---|
656 | |
---|
657 | static int |
---|
658 | devfs_close_f(struct file *fp, struct thread *td) |
---|
659 | { |
---|
660 | int error; |
---|
661 | struct file *fpop; |
---|
662 | |
---|
663 | /* |
---|
664 | * NB: td may be NULL if this descriptor is closed due to |
---|
665 | * garbage collection from a closed UNIX domain socket. |
---|
666 | */ |
---|
667 | fpop = curthread->td_fpop; |
---|
668 | curthread->td_fpop = fp; |
---|
669 | error = vnops.fo_close(fp, td); |
---|
670 | curthread->td_fpop = fpop; |
---|
671 | |
---|
672 | /* |
---|
673 | * The f_cdevpriv cannot be assigned non-NULL value while we |
---|
674 | * are destroying the file. |
---|
675 | */ |
---|
676 | if (fp->f_cdevpriv != NULL) |
---|
677 | devfs_fpdrop(fp); |
---|
678 | return (error); |
---|
679 | } |
---|
680 | |
---|
681 | static int |
---|
682 | devfs_getattr(struct vop_getattr_args *ap) |
---|
683 | { |
---|
684 | struct vnode *vp = ap->a_vp; |
---|
685 | struct vattr *vap = ap->a_vap; |
---|
686 | struct devfs_dirent *de; |
---|
687 | struct devfs_mount *dmp; |
---|
688 | struct cdev *dev; |
---|
689 | struct timeval boottime; |
---|
690 | int error; |
---|
691 | |
---|
692 | error = devfs_populate_vp(vp); |
---|
693 | if (error != 0) |
---|
694 | return (error); |
---|
695 | |
---|
696 | dmp = VFSTODEVFS(vp->v_mount); |
---|
697 | sx_xunlock(&dmp->dm_lock); |
---|
698 | |
---|
699 | de = vp->v_data; |
---|
700 | KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); |
---|
701 | if (vp->v_type == VDIR) { |
---|
702 | de = de->de_dir; |
---|
703 | KASSERT(de != NULL, |
---|
704 | ("Null dir dirent in devfs_getattr vp=%p", vp)); |
---|
705 | } |
---|
706 | vap->va_uid = de->de_uid; |
---|
707 | vap->va_gid = de->de_gid; |
---|
708 | vap->va_mode = de->de_mode; |
---|
709 | if (vp->v_type == VLNK) |
---|
710 | vap->va_size = strlen(de->de_symlink); |
---|
711 | else if (vp->v_type == VDIR) |
---|
712 | vap->va_size = vap->va_bytes = DEV_BSIZE; |
---|
713 | else |
---|
714 | vap->va_size = 0; |
---|
715 | if (vp->v_type != VDIR) |
---|
716 | vap->va_bytes = 0; |
---|
717 | vap->va_blocksize = DEV_BSIZE; |
---|
718 | vap->va_type = vp->v_type; |
---|
719 | |
---|
720 | getboottime(&boottime); |
---|
721 | #define fix(aa) \ |
---|
722 | do { \ |
---|
723 | if ((aa).tv_sec <= 3600) { \ |
---|
724 | (aa).tv_sec = boottime.tv_sec; \ |
---|
725 | (aa).tv_nsec = boottime.tv_usec * 1000; \ |
---|
726 | } \ |
---|
727 | } while (0) |
---|
728 | |
---|
729 | if (vp->v_type != VCHR) { |
---|
730 | fix(de->de_atime); |
---|
731 | vap->va_atime = de->de_atime; |
---|
732 | fix(de->de_mtime); |
---|
733 | vap->va_mtime = de->de_mtime; |
---|
734 | fix(de->de_ctime); |
---|
735 | vap->va_ctime = de->de_ctime; |
---|
736 | } else { |
---|
737 | dev = vp->v_rdev; |
---|
738 | fix(dev->si_atime); |
---|
739 | vap->va_atime = dev->si_atime; |
---|
740 | fix(dev->si_mtime); |
---|
741 | vap->va_mtime = dev->si_mtime; |
---|
742 | fix(dev->si_ctime); |
---|
743 | vap->va_ctime = dev->si_ctime; |
---|
744 | |
---|
745 | vap->va_rdev = cdev2priv(dev)->cdp_inode; |
---|
746 | } |
---|
747 | vap->va_gen = 0; |
---|
748 | vap->va_flags = 0; |
---|
749 | vap->va_filerev = 0; |
---|
750 | vap->va_nlink = de->de_links; |
---|
751 | vap->va_fileid = de->de_inode; |
---|
752 | |
---|
753 | return (error); |
---|
754 | } |
---|
755 | |
---|
756 | /* ARGSUSED */ |
---|
757 | static int |
---|
758 | devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) |
---|
759 | { |
---|
760 | struct file *fpop; |
---|
761 | int error; |
---|
762 | |
---|
763 | fpop = td->td_fpop; |
---|
764 | td->td_fpop = fp; |
---|
765 | error = vnops.fo_ioctl(fp, com, data, cred, td); |
---|
766 | td->td_fpop = fpop; |
---|
767 | return (error); |
---|
768 | } |
---|
769 | |
---|
770 | static int |
---|
771 | devfs_ioctl(struct vop_ioctl_args *ap) |
---|
772 | { |
---|
773 | struct fiodgname_arg *fgn; |
---|
774 | struct vnode *vpold, *vp; |
---|
775 | struct cdevsw *dsw; |
---|
776 | struct thread *td; |
---|
777 | struct cdev *dev; |
---|
778 | int error, ref, i; |
---|
779 | const char *p; |
---|
780 | u_long com; |
---|
781 | |
---|
782 | vp = ap->a_vp; |
---|
783 | com = ap->a_command; |
---|
784 | td = ap->a_td; |
---|
785 | |
---|
786 | dsw = devvn_refthread(vp, &dev, &ref); |
---|
787 | if (dsw == NULL) |
---|
788 | return (ENXIO); |
---|
789 | KASSERT(dev->si_refcount > 0, |
---|
790 | ("devfs: un-referenced struct cdev *(%s)", devtoname(dev))); |
---|
791 | |
---|
792 | if (com == FIODTYPE) { |
---|
793 | *(int *)ap->a_data = dsw->d_flags & D_TYPEMASK; |
---|
794 | error = 0; |
---|
795 | goto out; |
---|
796 | } else if (com == FIODGNAME) { |
---|
797 | fgn = ap->a_data; |
---|
798 | p = devtoname(dev); |
---|
799 | i = strlen(p) + 1; |
---|
800 | if (i > fgn->len) |
---|
801 | error = EINVAL; |
---|
802 | else |
---|
803 | error = copyout(p, fgn->buf, i); |
---|
804 | goto out; |
---|
805 | } |
---|
806 | |
---|
807 | error = dsw->d_ioctl(dev, com, ap->a_data, ap->a_fflag, td); |
---|
808 | |
---|
809 | out: |
---|
810 | dev_relthread(dev, ref); |
---|
811 | if (error == ENOIOCTL) |
---|
812 | error = ENOTTY; |
---|
813 | |
---|
814 | if (error == 0 && com == TIOCSCTTY) { |
---|
815 | /* Do nothing if reassigning same control tty */ |
---|
816 | sx_slock(&proctree_lock); |
---|
817 | if (td->td_proc->p_session->s_ttyvp == vp) { |
---|
818 | sx_sunlock(&proctree_lock); |
---|
819 | return (0); |
---|
820 | } |
---|
821 | |
---|
822 | vpold = td->td_proc->p_session->s_ttyvp; |
---|
823 | VREF(vp); |
---|
824 | SESS_LOCK(td->td_proc->p_session); |
---|
825 | td->td_proc->p_session->s_ttyvp = vp; |
---|
826 | td->td_proc->p_session->s_ttydp = cdev2priv(dev); |
---|
827 | SESS_UNLOCK(td->td_proc->p_session); |
---|
828 | |
---|
829 | sx_sunlock(&proctree_lock); |
---|
830 | |
---|
831 | /* Get rid of reference to old control tty */ |
---|
832 | if (vpold) |
---|
833 | vrele(vpold); |
---|
834 | } |
---|
835 | return (error); |
---|
836 | } |
---|
837 | |
---|
838 | /* ARGSUSED */ |
---|
839 | static int |
---|
840 | devfs_kqfilter_f(struct file *fp, struct knote *kn) |
---|
841 | { |
---|
842 | struct cdev *dev; |
---|
843 | struct cdevsw *dsw; |
---|
844 | int error, ref; |
---|
845 | struct file *fpop; |
---|
846 | struct thread *td; |
---|
847 | |
---|
848 | td = curthread; |
---|
849 | fpop = td->td_fpop; |
---|
850 | error = devfs_fp_check(fp, &dev, &dsw, &ref); |
---|
851 | if (error) |
---|
852 | return (error); |
---|
853 | error = dsw->d_kqfilter(dev, kn); |
---|
854 | td->td_fpop = fpop; |
---|
855 | dev_relthread(dev, ref); |
---|
856 | return (error); |
---|
857 | } |
---|
858 | |
---|
859 | static inline int |
---|
860 | devfs_prison_check(struct devfs_dirent *de, struct thread *td) |
---|
861 | { |
---|
862 | struct cdev_priv *cdp; |
---|
863 | struct ucred *dcr; |
---|
864 | struct proc *p; |
---|
865 | int error; |
---|
866 | |
---|
867 | cdp = de->de_cdp; |
---|
868 | if (cdp == NULL) |
---|
869 | return (0); |
---|
870 | dcr = cdp->cdp_c.si_cred; |
---|
871 | if (dcr == NULL) |
---|
872 | return (0); |
---|
873 | |
---|
874 | error = prison_check(td->td_ucred, dcr); |
---|
875 | if (error == 0) |
---|
876 | return (0); |
---|
877 | /* We do, however, allow access to the controlling terminal */ |
---|
878 | p = td->td_proc; |
---|
879 | PROC_LOCK(p); |
---|
880 | if (!(p->p_flag & P_CONTROLT)) { |
---|
881 | PROC_UNLOCK(p); |
---|
882 | return (error); |
---|
883 | } |
---|
884 | if (p->p_session->s_ttydp == cdp) |
---|
885 | error = 0; |
---|
886 | PROC_UNLOCK(p); |
---|
887 | return (error); |
---|
888 | } |
---|
889 | |
---|
890 | static int |
---|
891 | devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) |
---|
892 | { |
---|
893 | struct componentname *cnp; |
---|
894 | struct vnode *dvp, **vpp; |
---|
895 | struct thread *td; |
---|
896 | struct devfs_dirent *de, *dd; |
---|
897 | struct devfs_dirent **dde; |
---|
898 | struct devfs_mount *dmp; |
---|
899 | struct cdev *cdev; |
---|
900 | int error, flags, nameiop, dvplocked; |
---|
901 | char specname[SPECNAMELEN + 1], *pname; |
---|
902 | |
---|
903 | cnp = ap->a_cnp; |
---|
904 | vpp = ap->a_vpp; |
---|
905 | dvp = ap->a_dvp; |
---|
906 | pname = cnp->cn_nameptr; |
---|
907 | td = cnp->cn_thread; |
---|
908 | flags = cnp->cn_flags; |
---|
909 | nameiop = cnp->cn_nameiop; |
---|
910 | dmp = VFSTODEVFS(dvp->v_mount); |
---|
911 | dd = dvp->v_data; |
---|
912 | *vpp = NULLVP; |
---|
913 | |
---|
914 | if ((flags & ISLASTCN) && nameiop == RENAME) |
---|
915 | return (EOPNOTSUPP); |
---|
916 | |
---|
917 | if (dvp->v_type != VDIR) |
---|
918 | return (ENOTDIR); |
---|
919 | |
---|
920 | if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) |
---|
921 | return (EIO); |
---|
922 | |
---|
923 | error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); |
---|
924 | if (error) |
---|
925 | return (error); |
---|
926 | |
---|
927 | if (cnp->cn_namelen == 1 && *pname == '.') { |
---|
928 | if ((flags & ISLASTCN) && nameiop != LOOKUP) |
---|
929 | return (EINVAL); |
---|
930 | *vpp = dvp; |
---|
931 | VREF(dvp); |
---|
932 | return (0); |
---|
933 | } |
---|
934 | |
---|
935 | if (flags & ISDOTDOT) { |
---|
936 | if ((flags & ISLASTCN) && nameiop != LOOKUP) |
---|
937 | return (EINVAL); |
---|
938 | de = devfs_parent_dirent(dd); |
---|
939 | if (de == NULL) |
---|
940 | return (ENOENT); |
---|
941 | dvplocked = VOP_ISLOCKED(dvp); |
---|
942 | VOP_UNLOCK(dvp, 0); |
---|
943 | error = devfs_allocv(de, dvp->v_mount, |
---|
944 | cnp->cn_lkflags & LK_TYPE_MASK, vpp); |
---|
945 | *dm_unlock = 0; |
---|
946 | vn_lock(dvp, dvplocked | LK_RETRY); |
---|
947 | return (error); |
---|
948 | } |
---|
949 | |
---|
950 | dd = dvp->v_data; |
---|
951 | de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0); |
---|
952 | while (de == NULL) { /* While(...) so we can use break */ |
---|
953 | |
---|
954 | if (nameiop == DELETE) |
---|
955 | return (ENOENT); |
---|
956 | |
---|
957 | /* |
---|
958 | * OK, we didn't have an entry for the name we were asked for |
---|
959 | * so we try to see if anybody can create it on demand. |
---|
960 | */ |
---|
961 | pname = devfs_fqpn(specname, dmp, dd, cnp); |
---|
962 | if (pname == NULL) |
---|
963 | break; |
---|
964 | |
---|
965 | cdev = NULL; |
---|
966 | DEVFS_DMP_HOLD(dmp); |
---|
967 | sx_xunlock(&dmp->dm_lock); |
---|
968 | sx_slock(&clone_drain_lock); |
---|
969 | EVENTHANDLER_INVOKE(dev_clone, |
---|
970 | td->td_ucred, pname, strlen(pname), &cdev); |
---|
971 | sx_sunlock(&clone_drain_lock); |
---|
972 | |
---|
973 | if (cdev == NULL) |
---|
974 | sx_xlock(&dmp->dm_lock); |
---|
975 | else if (devfs_populate_vp(dvp) != 0) { |
---|
976 | *dm_unlock = 0; |
---|
977 | sx_xlock(&dmp->dm_lock); |
---|
978 | if (DEVFS_DMP_DROP(dmp)) { |
---|
979 | sx_xunlock(&dmp->dm_lock); |
---|
980 | devfs_unmount_final(dmp); |
---|
981 | } else |
---|
982 | sx_xunlock(&dmp->dm_lock); |
---|
983 | dev_rel(cdev); |
---|
984 | return (ENOENT); |
---|
985 | } |
---|
986 | if (DEVFS_DMP_DROP(dmp)) { |
---|
987 | *dm_unlock = 0; |
---|
988 | sx_xunlock(&dmp->dm_lock); |
---|
989 | devfs_unmount_final(dmp); |
---|
990 | if (cdev != NULL) |
---|
991 | dev_rel(cdev); |
---|
992 | return (ENOENT); |
---|
993 | } |
---|
994 | |
---|
995 | if (cdev == NULL) |
---|
996 | break; |
---|
997 | |
---|
998 | dev_lock(); |
---|
999 | dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; |
---|
1000 | if (dde != NULL && *dde != NULL) |
---|
1001 | de = *dde; |
---|
1002 | dev_unlock(); |
---|
1003 | dev_rel(cdev); |
---|
1004 | break; |
---|
1005 | } |
---|
1006 | |
---|
1007 | if (de == NULL || de->de_flags & DE_WHITEOUT) { |
---|
1008 | if ((nameiop == CREATE || nameiop == RENAME) && |
---|
1009 | (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { |
---|
1010 | cnp->cn_flags |= SAVENAME; |
---|
1011 | return (EJUSTRETURN); |
---|
1012 | } |
---|
1013 | return (ENOENT); |
---|
1014 | } |
---|
1015 | |
---|
1016 | if (devfs_prison_check(de, td)) |
---|
1017 | return (ENOENT); |
---|
1018 | |
---|
1019 | if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { |
---|
1020 | error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); |
---|
1021 | if (error) |
---|
1022 | return (error); |
---|
1023 | if (*vpp == dvp) { |
---|
1024 | VREF(dvp); |
---|
1025 | *vpp = dvp; |
---|
1026 | return (0); |
---|
1027 | } |
---|
1028 | } |
---|
1029 | error = devfs_allocv(de, dvp->v_mount, cnp->cn_lkflags & LK_TYPE_MASK, |
---|
1030 | vpp); |
---|
1031 | *dm_unlock = 0; |
---|
1032 | return (error); |
---|
1033 | } |
---|
1034 | |
---|
1035 | static int |
---|
1036 | devfs_lookup(struct vop_lookup_args *ap) |
---|
1037 | { |
---|
1038 | int j; |
---|
1039 | struct devfs_mount *dmp; |
---|
1040 | int dm_unlock; |
---|
1041 | |
---|
1042 | if (devfs_populate_vp(ap->a_dvp) != 0) |
---|
1043 | return (ENOTDIR); |
---|
1044 | |
---|
1045 | dmp = VFSTODEVFS(ap->a_dvp->v_mount); |
---|
1046 | dm_unlock = 1; |
---|
1047 | j = devfs_lookupx(ap, &dm_unlock); |
---|
1048 | if (dm_unlock == 1) |
---|
1049 | sx_xunlock(&dmp->dm_lock); |
---|
1050 | return (j); |
---|
1051 | } |
---|
1052 | |
---|
1053 | static int |
---|
1054 | devfs_mknod(struct vop_mknod_args *ap) |
---|
1055 | { |
---|
1056 | struct componentname *cnp; |
---|
1057 | struct vnode *dvp, **vpp; |
---|
1058 | struct devfs_dirent *dd, *de; |
---|
1059 | struct devfs_mount *dmp; |
---|
1060 | int error; |
---|
1061 | |
---|
1062 | /* |
---|
1063 | * The only type of node we should be creating here is a |
---|
1064 | * character device, for anything else return EOPNOTSUPP. |
---|
1065 | */ |
---|
1066 | if (ap->a_vap->va_type != VCHR) |
---|
1067 | return (EOPNOTSUPP); |
---|
1068 | dvp = ap->a_dvp; |
---|
1069 | dmp = VFSTODEVFS(dvp->v_mount); |
---|
1070 | |
---|
1071 | cnp = ap->a_cnp; |
---|
1072 | vpp = ap->a_vpp; |
---|
1073 | dd = dvp->v_data; |
---|
1074 | |
---|
1075 | error = ENOENT; |
---|
1076 | sx_xlock(&dmp->dm_lock); |
---|
1077 | TAILQ_FOREACH(de, &dd->de_dlist, de_list) { |
---|
1078 | if (cnp->cn_namelen != de->de_dirent->d_namlen) |
---|
1079 | continue; |
---|
1080 | if (de->de_dirent->d_type == DT_CHR && |
---|
1081 | (de->de_cdp->cdp_flags & CDP_ACTIVE) == 0) |
---|
1082 | continue; |
---|
1083 | if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, |
---|
1084 | de->de_dirent->d_namlen) != 0) |
---|
1085 | continue; |
---|
1086 | if (de->de_flags & DE_WHITEOUT) |
---|
1087 | break; |
---|
1088 | goto notfound; |
---|
1089 | } |
---|
1090 | if (de == NULL) |
---|
1091 | goto notfound; |
---|
1092 | de->de_flags &= ~DE_WHITEOUT; |
---|
1093 | error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp); |
---|
1094 | return (error); |
---|
1095 | notfound: |
---|
1096 | sx_xunlock(&dmp->dm_lock); |
---|
1097 | return (error); |
---|
1098 | } |
---|
1099 | |
---|
1100 | /* ARGSUSED */ |
---|
1101 | static int |
---|
1102 | devfs_open(struct vop_open_args *ap) |
---|
1103 | { |
---|
1104 | struct thread *td = ap->a_td; |
---|
1105 | struct vnode *vp = ap->a_vp; |
---|
1106 | struct cdev *dev = vp->v_rdev; |
---|
1107 | struct file *fp = ap->a_fp; |
---|
1108 | int error, ref, vlocked; |
---|
1109 | struct cdevsw *dsw; |
---|
1110 | struct file *fpop; |
---|
1111 | struct mtx *mtxp; |
---|
1112 | |
---|
1113 | if (vp->v_type == VBLK) |
---|
1114 | return (ENXIO); |
---|
1115 | |
---|
1116 | if (dev == NULL) |
---|
1117 | return (ENXIO); |
---|
1118 | |
---|
1119 | /* Make this field valid before any I/O in d_open. */ |
---|
1120 | if (dev->si_iosize_max == 0) |
---|
1121 | dev->si_iosize_max = DFLTPHYS; |
---|
1122 | |
---|
1123 | dsw = dev_refthread(dev, &ref); |
---|
1124 | if (dsw == NULL) |
---|
1125 | return (ENXIO); |
---|
1126 | if (fp == NULL && dsw->d_fdopen != NULL) { |
---|
1127 | dev_relthread(dev, ref); |
---|
1128 | return (ENXIO); |
---|
1129 | } |
---|
1130 | |
---|
1131 | vlocked = VOP_ISLOCKED(vp); |
---|
1132 | VOP_UNLOCK(vp, 0); |
---|
1133 | |
---|
1134 | fpop = td->td_fpop; |
---|
1135 | td->td_fpop = fp; |
---|
1136 | if (fp != NULL) { |
---|
1137 | fp->f_data = dev; |
---|
1138 | fp->f_vnode = vp; |
---|
1139 | } |
---|
1140 | if (dsw->d_fdopen != NULL) |
---|
1141 | error = dsw->d_fdopen(dev, ap->a_mode, td, fp); |
---|
1142 | else |
---|
1143 | error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); |
---|
1144 | /* Clean up any cdevpriv upon error. */ |
---|
1145 | if (error != 0) |
---|
1146 | devfs_clear_cdevpriv(); |
---|
1147 | td->td_fpop = fpop; |
---|
1148 | |
---|
1149 | vn_lock(vp, vlocked | LK_RETRY); |
---|
1150 | dev_relthread(dev, ref); |
---|
1151 | if (error != 0) { |
---|
1152 | if (error == ERESTART) |
---|
1153 | error = EINTR; |
---|
1154 | return (error); |
---|
1155 | } |
---|
1156 | |
---|
1157 | #if 0 /* /dev/console */ |
---|
1158 | KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp")); |
---|
1159 | #else |
---|
1160 | if (fp == NULL) |
---|
1161 | return (error); |
---|
1162 | #endif |
---|
1163 | if (fp->f_ops == &badfileops) |
---|
1164 | finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); |
---|
1165 | mtxp = mtx_pool_find(mtxpool_sleep, fp); |
---|
1166 | |
---|
1167 | /* |
---|
1168 | * Hint to the dofilewrite() to not force the buffer draining |
---|
1169 | * on the writer to the file. Most likely, the write would |
---|
1170 | * not need normal buffers. |
---|
1171 | */ |
---|
1172 | mtx_lock(mtxp); |
---|
1173 | fp->f_vnread_flags |= FDEVFS_VNODE; |
---|
1174 | mtx_unlock(mtxp); |
---|
1175 | return (error); |
---|
1176 | } |
---|
1177 | |
---|
1178 | static int |
---|
1179 | devfs_pathconf(struct vop_pathconf_args *ap) |
---|
1180 | { |
---|
1181 | |
---|
1182 | switch (ap->a_name) { |
---|
1183 | case _PC_MAC_PRESENT: |
---|
1184 | #ifdef MAC |
---|
1185 | /* |
---|
1186 | * If MAC is enabled, devfs automatically supports |
---|
1187 | * trivial non-persistant label storage. |
---|
1188 | */ |
---|
1189 | *ap->a_retval = 1; |
---|
1190 | #else |
---|
1191 | *ap->a_retval = 0; |
---|
1192 | #endif |
---|
1193 | return (0); |
---|
1194 | default: |
---|
1195 | return (vop_stdpathconf(ap)); |
---|
1196 | } |
---|
1197 | /* NOTREACHED */ |
---|
1198 | } |
---|
1199 | |
---|
1200 | /* ARGSUSED */ |
---|
1201 | static int |
---|
1202 | devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) |
---|
1203 | { |
---|
1204 | struct cdev *dev; |
---|
1205 | struct cdevsw *dsw; |
---|
1206 | int error, ref; |
---|
1207 | struct file *fpop; |
---|
1208 | |
---|
1209 | fpop = td->td_fpop; |
---|
1210 | error = devfs_fp_check(fp, &dev, &dsw, &ref); |
---|
1211 | if (error != 0) { |
---|
1212 | error = vnops.fo_poll(fp, events, cred, td); |
---|
1213 | return (error); |
---|
1214 | } |
---|
1215 | error = dsw->d_poll(dev, events, td); |
---|
1216 | td->td_fpop = fpop; |
---|
1217 | dev_relthread(dev, ref); |
---|
1218 | return(error); |
---|
1219 | } |
---|
1220 | |
---|
1221 | /* |
---|
1222 | * Print out the contents of a special device vnode. |
---|
1223 | */ |
---|
1224 | static int |
---|
1225 | devfs_print(struct vop_print_args *ap) |
---|
1226 | { |
---|
1227 | |
---|
1228 | printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); |
---|
1229 | return (0); |
---|
1230 | } |
---|
1231 | |
---|
1232 | static int |
---|
1233 | devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, |
---|
1234 | int flags, struct thread *td) |
---|
1235 | { |
---|
1236 | struct cdev *dev; |
---|
1237 | int ioflag, error, ref; |
---|
1238 | ssize_t resid; |
---|
1239 | struct cdevsw *dsw; |
---|
1240 | struct file *fpop; |
---|
1241 | |
---|
1242 | if (uio->uio_resid > DEVFS_IOSIZE_MAX) |
---|
1243 | return (EINVAL); |
---|
1244 | fpop = td->td_fpop; |
---|
1245 | error = devfs_fp_check(fp, &dev, &dsw, &ref); |
---|
1246 | if (error != 0) { |
---|
1247 | error = vnops.fo_read(fp, uio, cred, flags, td); |
---|
1248 | return (error); |
---|
1249 | } |
---|
1250 | resid = uio->uio_resid; |
---|
1251 | ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); |
---|
1252 | if (ioflag & O_DIRECT) |
---|
1253 | ioflag |= IO_DIRECT; |
---|
1254 | |
---|
1255 | foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); |
---|
1256 | error = dsw->d_read(dev, uio, ioflag); |
---|
1257 | if (uio->uio_resid != resid || (error == 0 && resid != 0)) |
---|
1258 | devfs_timestamp(&dev->si_atime); |
---|
1259 | td->td_fpop = fpop; |
---|
1260 | dev_relthread(dev, ref); |
---|
1261 | |
---|
1262 | foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF); |
---|
1263 | return (error); |
---|
1264 | } |
---|
1265 | |
---|
1266 | static int |
---|
1267 | devfs_readdir(struct vop_readdir_args *ap) |
---|
1268 | { |
---|
1269 | int error; |
---|
1270 | struct uio *uio; |
---|
1271 | struct dirent *dp; |
---|
1272 | struct devfs_dirent *dd; |
---|
1273 | struct devfs_dirent *de; |
---|
1274 | struct devfs_mount *dmp; |
---|
1275 | off_t off; |
---|
1276 | int *tmp_ncookies = NULL; |
---|
1277 | |
---|
1278 | if (ap->a_vp->v_type != VDIR) |
---|
1279 | return (ENOTDIR); |
---|
1280 | |
---|
1281 | uio = ap->a_uio; |
---|
1282 | if (uio->uio_offset < 0) |
---|
1283 | return (EINVAL); |
---|
1284 | |
---|
1285 | /* |
---|
1286 | * XXX: This is a temporary hack to get around this filesystem not |
---|
1287 | * supporting cookies. We store the location of the ncookies pointer |
---|
1288 | * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() |
---|
1289 | * and set the number of cookies to 0. We then set the pointer to |
---|
1290 | * NULL so that vfs_read_dirent doesn't try to call realloc() on |
---|
1291 | * ap->a_cookies. Later in this function, we restore the ap->a_ncookies |
---|
1292 | * pointer to its original location before returning to the caller. |
---|
1293 | */ |
---|
1294 | if (ap->a_ncookies != NULL) { |
---|
1295 | tmp_ncookies = ap->a_ncookies; |
---|
1296 | *ap->a_ncookies = 0; |
---|
1297 | ap->a_ncookies = NULL; |
---|
1298 | } |
---|
1299 | |
---|
1300 | dmp = VFSTODEVFS(ap->a_vp->v_mount); |
---|
1301 | if (devfs_populate_vp(ap->a_vp) != 0) { |
---|
1302 | if (tmp_ncookies != NULL) |
---|
1303 | ap->a_ncookies = tmp_ncookies; |
---|
1304 | return (EIO); |
---|
1305 | } |
---|
1306 | error = 0; |
---|
1307 | de = ap->a_vp->v_data; |
---|
1308 | off = 0; |
---|
1309 | TAILQ_FOREACH(dd, &de->de_dlist, de_list) { |
---|
1310 | KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); |
---|
1311 | if (dd->de_flags & (DE_COVERED | DE_WHITEOUT)) |
---|
1312 | continue; |
---|
1313 | if (devfs_prison_check(dd, uio->uio_td)) |
---|
1314 | continue; |
---|
1315 | if (dd->de_dirent->d_type == DT_DIR) |
---|
1316 | de = dd->de_dir; |
---|
1317 | else |
---|
1318 | de = dd; |
---|
1319 | dp = dd->de_dirent; |
---|
1320 | if (dp->d_reclen > uio->uio_resid) |
---|
1321 | break; |
---|
1322 | dp->d_fileno = de->de_inode; |
---|
1323 | if (off >= uio->uio_offset) { |
---|
1324 | error = vfs_read_dirent(ap, dp, off); |
---|
1325 | if (error) |
---|
1326 | break; |
---|
1327 | } |
---|
1328 | off += dp->d_reclen; |
---|
1329 | } |
---|
1330 | sx_xunlock(&dmp->dm_lock); |
---|
1331 | uio->uio_offset = off; |
---|
1332 | |
---|
1333 | /* |
---|
1334 | * Restore ap->a_ncookies if it wasn't originally NULL in the first |
---|
1335 | * place. |
---|
1336 | */ |
---|
1337 | if (tmp_ncookies != NULL) |
---|
1338 | ap->a_ncookies = tmp_ncookies; |
---|
1339 | |
---|
1340 | return (error); |
---|
1341 | } |
---|
1342 | |
---|
1343 | static int |
---|
1344 | devfs_readlink(struct vop_readlink_args *ap) |
---|
1345 | { |
---|
1346 | struct devfs_dirent *de; |
---|
1347 | |
---|
1348 | de = ap->a_vp->v_data; |
---|
1349 | return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); |
---|
1350 | } |
---|
1351 | |
---|
1352 | static int |
---|
1353 | devfs_reclaim(struct vop_reclaim_args *ap) |
---|
1354 | { |
---|
1355 | struct vnode *vp; |
---|
1356 | struct devfs_dirent *de; |
---|
1357 | |
---|
1358 | vp = ap->a_vp; |
---|
1359 | mtx_lock(&devfs_de_interlock); |
---|
1360 | de = vp->v_data; |
---|
1361 | if (de != NULL) { |
---|
1362 | de->de_vnode = NULL; |
---|
1363 | vp->v_data = NULL; |
---|
1364 | } |
---|
1365 | mtx_unlock(&devfs_de_interlock); |
---|
1366 | vnode_destroy_vobject(vp); |
---|
1367 | return (0); |
---|
1368 | } |
---|
1369 | |
---|
1370 | static int |
---|
1371 | devfs_reclaim_vchr(struct vop_reclaim_args *ap) |
---|
1372 | { |
---|
1373 | struct vnode *vp; |
---|
1374 | struct cdev *dev; |
---|
1375 | |
---|
1376 | vp = ap->a_vp; |
---|
1377 | MPASS(vp->v_type == VCHR); |
---|
1378 | |
---|
1379 | devfs_reclaim(ap); |
---|
1380 | |
---|
1381 | VI_LOCK(vp); |
---|
1382 | dev_lock(); |
---|
1383 | dev = vp->v_rdev; |
---|
1384 | vp->v_rdev = NULL; |
---|
1385 | if (dev != NULL) |
---|
1386 | dev->si_usecount -= vp->v_usecount; |
---|
1387 | dev_unlock(); |
---|
1388 | VI_UNLOCK(vp); |
---|
1389 | if (dev != NULL) |
---|
1390 | dev_rel(dev); |
---|
1391 | return (0); |
---|
1392 | } |
---|
1393 | |
---|
1394 | static int |
---|
1395 | devfs_remove(struct vop_remove_args *ap) |
---|
1396 | { |
---|
1397 | struct vnode *dvp = ap->a_dvp; |
---|
1398 | struct vnode *vp = ap->a_vp; |
---|
1399 | struct devfs_dirent *dd; |
---|
1400 | struct devfs_dirent *de, *de_covered; |
---|
1401 | struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); |
---|
1402 | |
---|
1403 | ASSERT_VOP_ELOCKED(dvp, "devfs_remove"); |
---|
1404 | ASSERT_VOP_ELOCKED(vp, "devfs_remove"); |
---|
1405 | |
---|
1406 | sx_xlock(&dmp->dm_lock); |
---|
1407 | dd = ap->a_dvp->v_data; |
---|
1408 | de = vp->v_data; |
---|
1409 | if (de->de_cdp == NULL) { |
---|
1410 | TAILQ_REMOVE(&dd->de_dlist, de, de_list); |
---|
1411 | if (de->de_dirent->d_type == DT_LNK) { |
---|
1412 | de_covered = devfs_find(dd, de->de_dirent->d_name, |
---|
1413 | de->de_dirent->d_namlen, 0); |
---|
1414 | if (de_covered != NULL) |
---|
1415 | de_covered->de_flags &= ~DE_COVERED; |
---|
1416 | } |
---|
1417 | /* We need to unlock dvp because devfs_delete() may lock it. */ |
---|
1418 | VOP_UNLOCK(vp, 0); |
---|
1419 | if (dvp != vp) |
---|
1420 | VOP_UNLOCK(dvp, 0); |
---|
1421 | devfs_delete(dmp, de, 0); |
---|
1422 | sx_xunlock(&dmp->dm_lock); |
---|
1423 | if (dvp != vp) |
---|
1424 | vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); |
---|
1425 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
---|
1426 | } else { |
---|
1427 | de->de_flags |= DE_WHITEOUT; |
---|
1428 | sx_xunlock(&dmp->dm_lock); |
---|
1429 | } |
---|
1430 | return (0); |
---|
1431 | } |
---|
1432 | |
---|
1433 | /* |
---|
1434 | * Revoke is called on a tty when a terminal session ends. The vnode |
---|
1435 | * is orphaned by setting v_op to deadfs so we need to let go of it |
---|
1436 | * as well so that we create a new one next time around. |
---|
1437 | * |
---|
1438 | */ |
---|
1439 | static int |
---|
1440 | devfs_revoke(struct vop_revoke_args *ap) |
---|
1441 | { |
---|
1442 | struct vnode *vp = ap->a_vp, *vp2; |
---|
1443 | struct cdev *dev; |
---|
1444 | struct cdev_priv *cdp; |
---|
1445 | struct devfs_dirent *de; |
---|
1446 | u_int i; |
---|
1447 | |
---|
1448 | KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); |
---|
1449 | |
---|
1450 | dev = vp->v_rdev; |
---|
1451 | cdp = cdev2priv(dev); |
---|
1452 | |
---|
1453 | dev_lock(); |
---|
1454 | cdp->cdp_inuse++; |
---|
1455 | dev_unlock(); |
---|
1456 | |
---|
1457 | vhold(vp); |
---|
1458 | vgone(vp); |
---|
1459 | vdrop(vp); |
---|
1460 | |
---|
1461 | VOP_UNLOCK(vp,0); |
---|
1462 | loop: |
---|
1463 | for (;;) { |
---|
1464 | mtx_lock(&devfs_de_interlock); |
---|
1465 | dev_lock(); |
---|
1466 | vp2 = NULL; |
---|
1467 | for (i = 0; i <= cdp->cdp_maxdirent; i++) { |
---|
1468 | de = cdp->cdp_dirents[i]; |
---|
1469 | if (de == NULL) |
---|
1470 | continue; |
---|
1471 | |
---|
1472 | vp2 = de->de_vnode; |
---|
1473 | if (vp2 != NULL) { |
---|
1474 | dev_unlock(); |
---|
1475 | VI_LOCK(vp2); |
---|
1476 | mtx_unlock(&devfs_de_interlock); |
---|
1477 | if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, |
---|
1478 | curthread)) |
---|
1479 | goto loop; |
---|
1480 | vhold(vp2); |
---|
1481 | vgone(vp2); |
---|
1482 | vdrop(vp2); |
---|
1483 | vput(vp2); |
---|
1484 | break; |
---|
1485 | } |
---|
1486 | } |
---|
1487 | if (vp2 != NULL) { |
---|
1488 | continue; |
---|
1489 | } |
---|
1490 | dev_unlock(); |
---|
1491 | mtx_unlock(&devfs_de_interlock); |
---|
1492 | break; |
---|
1493 | } |
---|
1494 | dev_lock(); |
---|
1495 | cdp->cdp_inuse--; |
---|
1496 | if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { |
---|
1497 | TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); |
---|
1498 | dev_unlock(); |
---|
1499 | dev_rel(&cdp->cdp_c); |
---|
1500 | } else |
---|
1501 | dev_unlock(); |
---|
1502 | |
---|
1503 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
---|
1504 | return (0); |
---|
1505 | } |
---|
1506 | |
---|
1507 | static int |
---|
1508 | devfs_rioctl(struct vop_ioctl_args *ap) |
---|
1509 | { |
---|
1510 | struct vnode *vp; |
---|
1511 | struct devfs_mount *dmp; |
---|
1512 | int error; |
---|
1513 | |
---|
1514 | vp = ap->a_vp; |
---|
1515 | vn_lock(vp, LK_SHARED | LK_RETRY); |
---|
1516 | if (vp->v_iflag & VI_DOOMED) { |
---|
1517 | VOP_UNLOCK(vp, 0); |
---|
1518 | return (EBADF); |
---|
1519 | } |
---|
1520 | dmp = VFSTODEVFS(vp->v_mount); |
---|
1521 | sx_xlock(&dmp->dm_lock); |
---|
1522 | VOP_UNLOCK(vp, 0); |
---|
1523 | DEVFS_DMP_HOLD(dmp); |
---|
1524 | devfs_populate(dmp); |
---|
1525 | if (DEVFS_DMP_DROP(dmp)) { |
---|
1526 | sx_xunlock(&dmp->dm_lock); |
---|
1527 | devfs_unmount_final(dmp); |
---|
1528 | return (ENOENT); |
---|
1529 | } |
---|
1530 | error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); |
---|
1531 | sx_xunlock(&dmp->dm_lock); |
---|
1532 | return (error); |
---|
1533 | } |
---|
1534 | |
---|
1535 | static int |
---|
1536 | devfs_rread(struct vop_read_args *ap) |
---|
1537 | { |
---|
1538 | |
---|
1539 | if (ap->a_vp->v_type != VDIR) |
---|
1540 | return (EINVAL); |
---|
1541 | return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); |
---|
1542 | } |
---|
1543 | |
---|
1544 | static int |
---|
1545 | devfs_setattr(struct vop_setattr_args *ap) |
---|
1546 | { |
---|
1547 | struct devfs_dirent *de; |
---|
1548 | struct vattr *vap; |
---|
1549 | struct vnode *vp; |
---|
1550 | struct thread *td; |
---|
1551 | int c, error; |
---|
1552 | uid_t uid; |
---|
1553 | gid_t gid; |
---|
1554 | |
---|
1555 | vap = ap->a_vap; |
---|
1556 | vp = ap->a_vp; |
---|
1557 | td = curthread; |
---|
1558 | if ((vap->va_type != VNON) || |
---|
1559 | (vap->va_nlink != VNOVAL) || |
---|
1560 | (vap->va_fsid != VNOVAL) || |
---|
1561 | (vap->va_fileid != VNOVAL) || |
---|
1562 | (vap->va_blocksize != VNOVAL) || |
---|
1563 | (vap->va_flags != VNOVAL && vap->va_flags != 0) || |
---|
1564 | (vap->va_rdev != VNOVAL) || |
---|
1565 | ((int)vap->va_bytes != VNOVAL) || |
---|
1566 | (vap->va_gen != VNOVAL)) { |
---|
1567 | return (EINVAL); |
---|
1568 | } |
---|
1569 | |
---|
1570 | error = devfs_populate_vp(vp); |
---|
1571 | if (error != 0) |
---|
1572 | return (error); |
---|
1573 | |
---|
1574 | de = vp->v_data; |
---|
1575 | if (vp->v_type == VDIR) |
---|
1576 | de = de->de_dir; |
---|
1577 | |
---|
1578 | c = 0; |
---|
1579 | if (vap->va_uid == (uid_t)VNOVAL) |
---|
1580 | uid = de->de_uid; |
---|
1581 | else |
---|
1582 | uid = vap->va_uid; |
---|
1583 | if (vap->va_gid == (gid_t)VNOVAL) |
---|
1584 | gid = de->de_gid; |
---|
1585 | else |
---|
1586 | gid = vap->va_gid; |
---|
1587 | if (uid != de->de_uid || gid != de->de_gid) { |
---|
1588 | if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || |
---|
1589 | (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { |
---|
1590 | error = priv_check(td, PRIV_VFS_CHOWN); |
---|
1591 | if (error != 0) |
---|
1592 | goto ret; |
---|
1593 | } |
---|
1594 | de->de_uid = uid; |
---|
1595 | de->de_gid = gid; |
---|
1596 | c = 1; |
---|
1597 | } |
---|
1598 | |
---|
1599 | if (vap->va_mode != (mode_t)VNOVAL) { |
---|
1600 | if (ap->a_cred->cr_uid != de->de_uid) { |
---|
1601 | error = priv_check(td, PRIV_VFS_ADMIN); |
---|
1602 | if (error != 0) |
---|
1603 | goto ret; |
---|
1604 | } |
---|
1605 | de->de_mode = vap->va_mode; |
---|
1606 | c = 1; |
---|
1607 | } |
---|
1608 | |
---|
1609 | if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { |
---|
1610 | error = vn_utimes_perm(vp, vap, ap->a_cred, td); |
---|
1611 | if (error != 0) |
---|
1612 | goto ret; |
---|
1613 | if (vap->va_atime.tv_sec != VNOVAL) { |
---|
1614 | if (vp->v_type == VCHR) |
---|
1615 | vp->v_rdev->si_atime = vap->va_atime; |
---|
1616 | else |
---|
1617 | de->de_atime = vap->va_atime; |
---|
1618 | } |
---|
1619 | if (vap->va_mtime.tv_sec != VNOVAL) { |
---|
1620 | if (vp->v_type == VCHR) |
---|
1621 | vp->v_rdev->si_mtime = vap->va_mtime; |
---|
1622 | else |
---|
1623 | de->de_mtime = vap->va_mtime; |
---|
1624 | } |
---|
1625 | c = 1; |
---|
1626 | } |
---|
1627 | |
---|
1628 | if (c) { |
---|
1629 | if (vp->v_type == VCHR) |
---|
1630 | vfs_timestamp(&vp->v_rdev->si_ctime); |
---|
1631 | else |
---|
1632 | vfs_timestamp(&de->de_mtime); |
---|
1633 | } |
---|
1634 | |
---|
1635 | ret: |
---|
1636 | sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock); |
---|
1637 | return (error); |
---|
1638 | } |
---|
1639 | |
---|
1640 | #ifdef MAC |
---|
1641 | static int |
---|
1642 | devfs_setlabel(struct vop_setlabel_args *ap) |
---|
1643 | { |
---|
1644 | struct vnode *vp; |
---|
1645 | struct devfs_dirent *de; |
---|
1646 | |
---|
1647 | vp = ap->a_vp; |
---|
1648 | de = vp->v_data; |
---|
1649 | |
---|
1650 | mac_vnode_relabel(ap->a_cred, vp, ap->a_label); |
---|
1651 | mac_devfs_update(vp->v_mount, de, vp); |
---|
1652 | |
---|
1653 | return (0); |
---|
1654 | } |
---|
1655 | #endif |
---|
1656 | |
---|
1657 | static int |
---|
1658 | devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) |
---|
1659 | { |
---|
1660 | |
---|
1661 | return (vnops.fo_stat(fp, sb, cred, td)); |
---|
1662 | } |
---|
1663 | |
---|
1664 | static int |
---|
1665 | devfs_symlink(struct vop_symlink_args *ap) |
---|
1666 | { |
---|
1667 | int i, error; |
---|
1668 | struct devfs_dirent *dd; |
---|
1669 | struct devfs_dirent *de, *de_covered, *de_dotdot; |
---|
1670 | struct devfs_mount *dmp; |
---|
1671 | |
---|
1672 | error = priv_check(curthread, PRIV_DEVFS_SYMLINK); |
---|
1673 | if (error) |
---|
1674 | return(error); |
---|
1675 | dmp = VFSTODEVFS(ap->a_dvp->v_mount); |
---|
1676 | if (devfs_populate_vp(ap->a_dvp) != 0) |
---|
1677 | return (ENOENT); |
---|
1678 | |
---|
1679 | dd = ap->a_dvp->v_data; |
---|
1680 | de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); |
---|
1681 | de->de_flags = DE_USER; |
---|
1682 | de->de_uid = 0; |
---|
1683 | de->de_gid = 0; |
---|
1684 | de->de_mode = 0755; |
---|
1685 | de->de_inode = alloc_unr(devfs_inos); |
---|
1686 | de->de_dir = dd; |
---|
1687 | de->de_dirent->d_type = DT_LNK; |
---|
1688 | i = strlen(ap->a_target) + 1; |
---|
1689 | de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); |
---|
1690 | bcopy(ap->a_target, de->de_symlink, i); |
---|
1691 | #ifdef MAC |
---|
1692 | mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); |
---|
1693 | #endif |
---|
1694 | de_covered = devfs_find(dd, de->de_dirent->d_name, |
---|
1695 | de->de_dirent->d_namlen, 0); |
---|
1696 | if (de_covered != NULL) { |
---|
1697 | if ((de_covered->de_flags & DE_USER) != 0) { |
---|
1698 | devfs_delete(dmp, de, DEVFS_DEL_NORECURSE); |
---|
1699 | sx_xunlock(&dmp->dm_lock); |
---|
1700 | return (EEXIST); |
---|
1701 | } |
---|
1702 | KASSERT((de_covered->de_flags & DE_COVERED) == 0, |
---|
1703 | ("devfs_symlink: entry %p already covered", de_covered)); |
---|
1704 | de_covered->de_flags |= DE_COVERED; |
---|
1705 | } |
---|
1706 | |
---|
1707 | de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */ |
---|
1708 | de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */ |
---|
1709 | TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list); |
---|
1710 | devfs_dir_ref_de(dmp, dd); |
---|
1711 | devfs_rules_apply(dmp, de); |
---|
1712 | |
---|
1713 | return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp)); |
---|
1714 | } |
---|
1715 | |
---|
1716 | static int |
---|
1717 | devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) |
---|
1718 | { |
---|
1719 | |
---|
1720 | return (vnops.fo_truncate(fp, length, cred, td)); |
---|
1721 | } |
---|
1722 | |
---|
1723 | static int |
---|
1724 | devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, |
---|
1725 | int flags, struct thread *td) |
---|
1726 | { |
---|
1727 | struct cdev *dev; |
---|
1728 | int error, ioflag, ref; |
---|
1729 | ssize_t resid; |
---|
1730 | struct cdevsw *dsw; |
---|
1731 | struct file *fpop; |
---|
1732 | |
---|
1733 | if (uio->uio_resid > DEVFS_IOSIZE_MAX) |
---|
1734 | return (EINVAL); |
---|
1735 | fpop = td->td_fpop; |
---|
1736 | error = devfs_fp_check(fp, &dev, &dsw, &ref); |
---|
1737 | if (error != 0) { |
---|
1738 | error = vnops.fo_write(fp, uio, cred, flags, td); |
---|
1739 | return (error); |
---|
1740 | } |
---|
1741 | KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); |
---|
1742 | ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); |
---|
1743 | if (ioflag & O_DIRECT) |
---|
1744 | ioflag |= IO_DIRECT; |
---|
1745 | foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); |
---|
1746 | |
---|
1747 | resid = uio->uio_resid; |
---|
1748 | |
---|
1749 | error = dsw->d_write(dev, uio, ioflag); |
---|
1750 | if (uio->uio_resid != resid || (error == 0 && resid != 0)) { |
---|
1751 | devfs_timestamp(&dev->si_ctime); |
---|
1752 | dev->si_mtime = dev->si_ctime; |
---|
1753 | } |
---|
1754 | td->td_fpop = fpop; |
---|
1755 | dev_relthread(dev, ref); |
---|
1756 | |
---|
1757 | foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF); |
---|
1758 | return (error); |
---|
1759 | } |
---|
1760 | |
---|
1761 | static int |
---|
1762 | devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size, |
---|
1763 | vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, |
---|
1764 | struct thread *td) |
---|
1765 | { |
---|
1766 | struct cdev *dev; |
---|
1767 | struct cdevsw *dsw; |
---|
1768 | struct mount *mp; |
---|
1769 | struct vnode *vp; |
---|
1770 | struct file *fpop; |
---|
1771 | vm_object_t object; |
---|
1772 | vm_prot_t maxprot; |
---|
1773 | int error, ref; |
---|
1774 | |
---|
1775 | vp = fp->f_vnode; |
---|
1776 | |
---|
1777 | /* |
---|
1778 | * Ensure that file and memory protections are |
---|
1779 | * compatible. |
---|
1780 | */ |
---|
1781 | mp = vp->v_mount; |
---|
1782 | if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) { |
---|
1783 | maxprot = VM_PROT_NONE; |
---|
1784 | if ((prot & VM_PROT_EXECUTE) != 0) |
---|
1785 | return (EACCES); |
---|
1786 | } else |
---|
1787 | maxprot = VM_PROT_EXECUTE; |
---|
1788 | if ((fp->f_flag & FREAD) != 0) |
---|
1789 | maxprot |= VM_PROT_READ; |
---|
1790 | else if ((prot & VM_PROT_READ) != 0) |
---|
1791 | return (EACCES); |
---|
1792 | |
---|
1793 | /* |
---|
1794 | * If we are sharing potential changes via MAP_SHARED and we |
---|
1795 | * are trying to get write permission although we opened it |
---|
1796 | * without asking for it, bail out. |
---|
1797 | * |
---|
1798 | * Note that most character devices always share mappings. |
---|
1799 | * The one exception is that D_MMAP_ANON devices |
---|
1800 | * (i.e. /dev/zero) permit private writable mappings. |
---|
1801 | * |
---|
1802 | * Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests |
---|
1803 | * as well as updating maxprot to permit writing for |
---|
1804 | * D_MMAP_ANON devices rather than doing that here. |
---|
1805 | */ |
---|
1806 | if ((flags & MAP_SHARED) != 0) { |
---|
1807 | if ((fp->f_flag & FWRITE) != 0) |
---|
1808 | maxprot |= VM_PROT_WRITE; |
---|
1809 | else if ((prot & VM_PROT_WRITE) != 0) |
---|
1810 | return (EACCES); |
---|
1811 | } |
---|
1812 | maxprot &= cap_maxprot; |
---|
1813 | |
---|
1814 | fpop = td->td_fpop; |
---|
1815 | error = devfs_fp_check(fp, &dev, &dsw, &ref); |
---|
1816 | if (error != 0) |
---|
1817 | return (error); |
---|
1818 | |
---|
1819 | error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff, |
---|
1820 | &object); |
---|
1821 | td->td_fpop = fpop; |
---|
1822 | dev_relthread(dev, ref); |
---|
1823 | if (error != 0) |
---|
1824 | return (error); |
---|
1825 | |
---|
1826 | error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, |
---|
1827 | foff, FALSE, td); |
---|
1828 | if (error != 0) |
---|
1829 | vm_object_deallocate(object); |
---|
1830 | return (error); |
---|
1831 | } |
---|
1832 | |
---|
1833 | dev_t |
---|
1834 | dev2udev(struct cdev *x) |
---|
1835 | { |
---|
1836 | if (x == NULL) |
---|
1837 | return (NODEV); |
---|
1838 | return (cdev2priv(x)->cdp_inode); |
---|
1839 | } |
---|
1840 | |
---|
1841 | static struct fileops devfs_ops_f = { |
---|
1842 | .fo_read = devfs_read_f, |
---|
1843 | .fo_write = devfs_write_f, |
---|
1844 | .fo_truncate = devfs_truncate_f, |
---|
1845 | .fo_ioctl = devfs_ioctl_f, |
---|
1846 | .fo_poll = devfs_poll_f, |
---|
1847 | .fo_kqfilter = devfs_kqfilter_f, |
---|
1848 | .fo_stat = devfs_stat_f, |
---|
1849 | .fo_close = devfs_close_f, |
---|
1850 | .fo_chmod = vn_chmod, |
---|
1851 | .fo_chown = vn_chown, |
---|
1852 | .fo_sendfile = vn_sendfile, |
---|
1853 | .fo_seek = vn_seek, |
---|
1854 | .fo_fill_kinfo = vn_fill_kinfo, |
---|
1855 | .fo_mmap = devfs_mmap_f, |
---|
1856 | .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE |
---|
1857 | }; |
---|
1858 | |
---|
1859 | /* Vops for non-CHR vnodes in /dev. */ |
---|
1860 | static struct vop_vector devfs_vnodeops = { |
---|
1861 | .vop_default = &default_vnodeops, |
---|
1862 | |
---|
1863 | .vop_access = devfs_access, |
---|
1864 | .vop_getattr = devfs_getattr, |
---|
1865 | .vop_ioctl = devfs_rioctl, |
---|
1866 | .vop_lookup = devfs_lookup, |
---|
1867 | .vop_mknod = devfs_mknod, |
---|
1868 | .vop_pathconf = devfs_pathconf, |
---|
1869 | .vop_read = devfs_rread, |
---|
1870 | .vop_readdir = devfs_readdir, |
---|
1871 | .vop_readlink = devfs_readlink, |
---|
1872 | .vop_reclaim = devfs_reclaim, |
---|
1873 | .vop_remove = devfs_remove, |
---|
1874 | .vop_revoke = devfs_revoke, |
---|
1875 | .vop_setattr = devfs_setattr, |
---|
1876 | #ifdef MAC |
---|
1877 | .vop_setlabel = devfs_setlabel, |
---|
1878 | #endif |
---|
1879 | .vop_symlink = devfs_symlink, |
---|
1880 | .vop_vptocnp = devfs_vptocnp, |
---|
1881 | }; |
---|
1882 | |
---|
1883 | /* Vops for VCHR vnodes in /dev. */ |
---|
1884 | static struct vop_vector devfs_specops = { |
---|
1885 | .vop_default = &default_vnodeops, |
---|
1886 | |
---|
1887 | .vop_access = devfs_access, |
---|
1888 | .vop_bmap = VOP_PANIC, |
---|
1889 | .vop_close = devfs_close, |
---|
1890 | .vop_create = VOP_PANIC, |
---|
1891 | .vop_fsync = vop_stdfsync, |
---|
1892 | .vop_getattr = devfs_getattr, |
---|
1893 | .vop_ioctl = devfs_ioctl, |
---|
1894 | .vop_link = VOP_PANIC, |
---|
1895 | .vop_mkdir = VOP_PANIC, |
---|
1896 | .vop_mknod = VOP_PANIC, |
---|
1897 | .vop_open = devfs_open, |
---|
1898 | .vop_pathconf = devfs_pathconf, |
---|
1899 | .vop_poll = dead_poll, |
---|
1900 | .vop_print = devfs_print, |
---|
1901 | .vop_read = dead_read, |
---|
1902 | .vop_readdir = VOP_PANIC, |
---|
1903 | .vop_readlink = VOP_PANIC, |
---|
1904 | .vop_reallocblks = VOP_PANIC, |
---|
1905 | .vop_reclaim = devfs_reclaim_vchr, |
---|
1906 | .vop_remove = devfs_remove, |
---|
1907 | .vop_rename = VOP_PANIC, |
---|
1908 | .vop_revoke = devfs_revoke, |
---|
1909 | .vop_rmdir = VOP_PANIC, |
---|
1910 | .vop_setattr = devfs_setattr, |
---|
1911 | #ifdef MAC |
---|
1912 | .vop_setlabel = devfs_setlabel, |
---|
1913 | #endif |
---|
1914 | .vop_strategy = VOP_PANIC, |
---|
1915 | .vop_symlink = VOP_PANIC, |
---|
1916 | .vop_vptocnp = devfs_vptocnp, |
---|
1917 | .vop_write = dead_write, |
---|
1918 | }; |
---|
1919 | |
---|
1920 | /* |
---|
1921 | * Our calling convention to the device drivers used to be that we passed |
---|
1922 | * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ |
---|
1923 | * flags instead since that's what open(), close() and ioctl() takes and |
---|
1924 | * we don't really want vnode.h in device drivers. |
---|
1925 | * We solved the source compatibility by redefining some vnode flags to |
---|
1926 | * be the same as the fcntl ones and by sending down the bitwise OR of |
---|
1927 | * the respective fcntl/vnode flags. These CTASSERTS make sure nobody |
---|
1928 | * pulls the rug out under this. |
---|
1929 | */ |
---|
1930 | CTASSERT(O_NONBLOCK == IO_NDELAY); |
---|
1931 | CTASSERT(O_FSYNC == IO_SYNC); |
---|