1 | #include <machine/rtems-bsd-kernel-space.h> |
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2 | |
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3 | /*- |
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4 | * SPDX-License-Identifier: BSD-3-Clause |
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5 | * |
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6 | * Copyright (c) 1989, 1993 |
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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 contributed to Berkeley by |
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10 | * Rick Macklem at The University of Guelph. |
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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. Redistributions in binary form must reproduce the above copyright |
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18 | * notice, this list of conditions and the following disclaimer in the |
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19 | * documentation and/or other materials provided with the distribution. |
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20 | * 3. Neither the name of the University nor the names of its contributors |
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21 | * may be used to endorse or promote products derived from this software |
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22 | * without specific prior written permission. |
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23 | * |
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24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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34 | * SUCH DAMAGE. |
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35 | * |
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36 | * from nfs_subs.c 8.8 (Berkeley) 5/22/95 |
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37 | */ |
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38 | |
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39 | #include <sys/cdefs.h> |
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40 | __FBSDID("$FreeBSD$"); |
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41 | |
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42 | /* |
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43 | * These functions support the macros and help fiddle mbuf chains for |
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44 | * the nfs op functions. They do things like create the rpc header and |
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45 | * copy data between mbuf chains and uio lists. |
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46 | */ |
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47 | |
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48 | #include <sys/param.h> |
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49 | #include <sys/systm.h> |
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50 | #include <sys/kernel.h> |
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51 | #include <sys/bio.h> |
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52 | #include <sys/buf.h> |
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53 | #include <sys/proc.h> |
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54 | #include <sys/mount.h> |
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55 | #include <sys/vnode.h> |
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56 | #include <sys/namei.h> |
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57 | #include <sys/mbuf.h> |
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58 | #include <sys/socket.h> |
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59 | #include <sys/stat.h> |
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60 | #include <sys/malloc.h> |
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61 | #include <sys/sysent.h> |
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62 | #ifndef __rtems__ |
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63 | #include <sys/syscall.h> |
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64 | #endif /* __rtems__ */ |
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65 | #include <sys/sysproto.h> |
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66 | #include <sys/taskqueue.h> |
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67 | |
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68 | #include <vm/vm.h> |
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69 | #include <vm/vm_object.h> |
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70 | #include <vm/vm_extern.h> |
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71 | #include <vm/uma.h> |
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72 | |
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73 | #include <fs/nfs/nfsport.h> |
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74 | #include <fs/nfsclient/nfsnode.h> |
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75 | #include <fs/nfsclient/nfsmount.h> |
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76 | #include <fs/nfsclient/nfs.h> |
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77 | #include <fs/nfsclient/nfs_kdtrace.h> |
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78 | |
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79 | #include <netinet/in.h> |
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80 | |
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81 | /* |
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82 | * Note that stdarg.h and the ANSI style va_start macro is used for both |
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83 | * ANSI and traditional C compilers. |
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84 | */ |
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85 | #include <machine/stdarg.h> |
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86 | |
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87 | extern struct mtx ncl_iod_mutex; |
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88 | extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON]; |
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89 | extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON]; |
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90 | extern int ncl_numasync; |
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91 | extern unsigned int ncl_iodmax; |
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92 | extern struct nfsstatsv1 nfsstatsv1; |
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93 | |
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94 | struct task ncl_nfsiodnew_task; |
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95 | |
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96 | int |
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97 | ncl_uninit(struct vfsconf *vfsp) |
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98 | { |
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99 | /* |
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100 | * XXX: Unloading of nfscl module is unsupported. |
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101 | */ |
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102 | #if 0 |
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103 | int i; |
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104 | |
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105 | /* |
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106 | * Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup |
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107 | * any sleeping nfsiods so they check ncl_iodmax and exit. |
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108 | */ |
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109 | NFSLOCKIOD(); |
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110 | ncl_iodmax = 0; |
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111 | for (i = 0; i < ncl_numasync; i++) |
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112 | if (ncl_iodwant[i] == NFSIOD_AVAILABLE) |
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113 | wakeup(&ncl_iodwant[i]); |
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114 | /* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */ |
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115 | while (ncl_numasync) |
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116 | msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0); |
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117 | NFSUNLOCKIOD(); |
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118 | ncl_nhuninit(); |
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119 | return (0); |
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120 | #else |
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121 | return (EOPNOTSUPP); |
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122 | #endif |
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123 | } |
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124 | |
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125 | void |
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126 | ncl_dircookie_lock(struct nfsnode *np) |
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127 | { |
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128 | NFSLOCKNODE(np); |
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129 | while (np->n_flag & NDIRCOOKIELK) |
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130 | (void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0); |
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131 | np->n_flag |= NDIRCOOKIELK; |
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132 | NFSUNLOCKNODE(np); |
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133 | } |
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134 | |
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135 | void |
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136 | ncl_dircookie_unlock(struct nfsnode *np) |
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137 | { |
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138 | NFSLOCKNODE(np); |
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139 | np->n_flag &= ~NDIRCOOKIELK; |
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140 | wakeup(&np->n_flag); |
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141 | NFSUNLOCKNODE(np); |
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142 | } |
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143 | |
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144 | bool |
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145 | ncl_excl_start(struct vnode *vp) |
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146 | { |
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147 | struct nfsnode *np; |
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148 | int vn_lk; |
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149 | |
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150 | ASSERT_VOP_LOCKED(vp, "ncl_excl_start"); |
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151 | vn_lk = NFSVOPISLOCKED(vp); |
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152 | if (vn_lk == LK_EXCLUSIVE) |
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153 | return (false); |
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154 | KASSERT(vn_lk == LK_SHARED, |
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155 | ("ncl_excl_start: wrong vnode lock %d", vn_lk)); |
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156 | /* Ensure exclusive access, this might block */ |
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157 | np = VTONFS(vp); |
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158 | lockmgr(&np->n_excl, LK_EXCLUSIVE, NULL); |
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159 | return (true); |
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160 | } |
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161 | |
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162 | void |
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163 | ncl_excl_finish(struct vnode *vp, bool old_lock) |
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164 | { |
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165 | struct nfsnode *np; |
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166 | |
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167 | if (!old_lock) |
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168 | return; |
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169 | np = VTONFS(vp); |
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170 | lockmgr(&np->n_excl, LK_RELEASE, NULL); |
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171 | } |
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172 | |
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173 | #ifdef NFS_ACDEBUG |
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174 | #include <sys/sysctl.h> |
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175 | SYSCTL_DECL(_vfs_nfs); |
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176 | static int nfs_acdebug; |
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177 | SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, ""); |
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178 | #endif |
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179 | |
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180 | /* |
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181 | * Check the time stamp |
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182 | * If the cache is valid, copy contents to *vap and return 0 |
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183 | * otherwise return an error |
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184 | */ |
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185 | int |
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186 | ncl_getattrcache(struct vnode *vp, struct vattr *vaper) |
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187 | { |
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188 | struct nfsnode *np; |
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189 | struct vattr *vap; |
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190 | struct nfsmount *nmp; |
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191 | int timeo, mustflush; |
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192 | u_quad_t nsize; |
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193 | bool setnsize; |
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194 | |
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195 | np = VTONFS(vp); |
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196 | vap = &np->n_vattr.na_vattr; |
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197 | nmp = VFSTONFS(vp->v_mount); |
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198 | mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */ |
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199 | NFSLOCKNODE(np); |
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200 | /* XXX n_mtime doesn't seem to be updated on a miss-and-reload */ |
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201 | timeo = (time_second - np->n_mtime.tv_sec) / 10; |
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202 | |
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203 | #ifdef NFS_ACDEBUG |
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204 | if (nfs_acdebug>1) |
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205 | printf("ncl_getattrcache: initial timeo = %d\n", timeo); |
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206 | #endif |
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207 | |
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208 | if (vap->va_type == VDIR) { |
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209 | if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin) |
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210 | timeo = nmp->nm_acdirmin; |
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211 | else if (timeo > nmp->nm_acdirmax) |
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212 | timeo = nmp->nm_acdirmax; |
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213 | } else { |
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214 | if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin) |
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215 | timeo = nmp->nm_acregmin; |
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216 | else if (timeo > nmp->nm_acregmax) |
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217 | timeo = nmp->nm_acregmax; |
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218 | } |
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219 | |
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220 | #ifdef NFS_ACDEBUG |
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221 | if (nfs_acdebug > 2) |
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222 | printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n", |
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223 | nmp->nm_acregmin, nmp->nm_acregmax, |
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224 | nmp->nm_acdirmin, nmp->nm_acdirmax); |
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225 | |
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226 | if (nfs_acdebug) |
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227 | printf("ncl_getattrcache: age = %d; final timeo = %d\n", |
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228 | (time_second - np->n_attrstamp), timeo); |
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229 | #endif |
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230 | |
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231 | if ((time_second - np->n_attrstamp) >= timeo && |
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232 | (mustflush != 0 || np->n_attrstamp == 0)) { |
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233 | nfsstatsv1.attrcache_misses++; |
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234 | NFSUNLOCKNODE(np); |
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235 | KDTRACE_NFS_ATTRCACHE_GET_MISS(vp); |
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236 | return( ENOENT); |
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237 | } |
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238 | nfsstatsv1.attrcache_hits++; |
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239 | setnsize = false; |
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240 | if (vap->va_size != np->n_size) { |
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241 | if (vap->va_type == VREG) { |
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242 | if (np->n_flag & NMODIFIED) { |
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243 | if (vap->va_size < np->n_size) |
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244 | vap->va_size = np->n_size; |
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245 | else |
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246 | np->n_size = vap->va_size; |
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247 | } else { |
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248 | np->n_size = vap->va_size; |
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249 | } |
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250 | setnsize = ncl_pager_setsize(vp, &nsize); |
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251 | } else { |
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252 | np->n_size = vap->va_size; |
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253 | } |
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254 | } |
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255 | bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); |
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256 | if (np->n_flag & NCHG) { |
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257 | if (np->n_flag & NACC) |
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258 | vaper->va_atime = np->n_atim; |
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259 | if (np->n_flag & NUPD) |
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260 | vaper->va_mtime = np->n_mtim; |
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261 | } |
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262 | NFSUNLOCKNODE(np); |
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263 | #ifndef __rtems__ |
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264 | if (setnsize) |
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265 | vnode_pager_setsize(vp, nsize); |
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266 | #endif /* __rtems__ */ |
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267 | KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap); |
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268 | return (0); |
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269 | } |
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270 | |
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271 | static nfsuint64 nfs_nullcookie = { { 0, 0 } }; |
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272 | /* |
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273 | * This function finds the directory cookie that corresponds to the |
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274 | * logical byte offset given. |
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275 | */ |
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276 | nfsuint64 * |
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277 | ncl_getcookie(struct nfsnode *np, off_t off, int add) |
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278 | { |
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279 | struct nfsdmap *dp, *dp2; |
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280 | int pos; |
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281 | nfsuint64 *retval = NULL; |
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282 | |
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283 | pos = (uoff_t)off / NFS_DIRBLKSIZ; |
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284 | if (pos == 0 || off < 0) { |
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285 | KASSERT(!add, ("nfs getcookie add at <= 0")); |
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286 | return (&nfs_nullcookie); |
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287 | } |
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288 | pos--; |
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289 | dp = LIST_FIRST(&np->n_cookies); |
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290 | if (!dp) { |
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291 | if (add) { |
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292 | dp = malloc(sizeof (struct nfsdmap), |
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293 | M_NFSDIROFF, M_WAITOK); |
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294 | dp->ndm_eocookie = 0; |
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295 | LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list); |
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296 | } else |
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297 | goto out; |
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298 | } |
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299 | while (pos >= NFSNUMCOOKIES) { |
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300 | pos -= NFSNUMCOOKIES; |
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301 | if (LIST_NEXT(dp, ndm_list)) { |
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302 | if (!add && dp->ndm_eocookie < NFSNUMCOOKIES && |
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303 | pos >= dp->ndm_eocookie) |
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304 | goto out; |
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305 | dp = LIST_NEXT(dp, ndm_list); |
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306 | } else if (add) { |
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307 | dp2 = malloc(sizeof (struct nfsdmap), |
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308 | M_NFSDIROFF, M_WAITOK); |
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309 | dp2->ndm_eocookie = 0; |
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310 | LIST_INSERT_AFTER(dp, dp2, ndm_list); |
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311 | dp = dp2; |
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312 | } else |
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313 | goto out; |
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314 | } |
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315 | if (pos >= dp->ndm_eocookie) { |
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316 | if (add) |
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317 | dp->ndm_eocookie = pos + 1; |
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318 | else |
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319 | goto out; |
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320 | } |
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321 | retval = &dp->ndm_cookies[pos]; |
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322 | out: |
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323 | return (retval); |
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324 | } |
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325 | |
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326 | /* |
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327 | * Invalidate cached directory information, except for the actual directory |
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328 | * blocks (which are invalidated separately). |
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329 | * Done mainly to avoid the use of stale offset cookies. |
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330 | */ |
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331 | void |
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332 | ncl_invaldir(struct vnode *vp) |
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333 | { |
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334 | struct nfsnode *np = VTONFS(vp); |
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335 | |
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336 | KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir")); |
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337 | ncl_dircookie_lock(np); |
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338 | np->n_direofoffset = 0; |
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339 | np->n_cookieverf.nfsuquad[0] = 0; |
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340 | np->n_cookieverf.nfsuquad[1] = 0; |
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341 | if (LIST_FIRST(&np->n_cookies)) |
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342 | LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0; |
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343 | ncl_dircookie_unlock(np); |
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344 | } |
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345 | |
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346 | /* |
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347 | * The write verifier has changed (probably due to a server reboot), so all |
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348 | * B_NEEDCOMMIT blocks will have to be written again. Since they are on the |
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349 | * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT |
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350 | * and B_CLUSTEROK flags. Once done the new write verifier can be set for the |
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351 | * mount point. |
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352 | * |
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353 | * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data |
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354 | * writes are not clusterable. |
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355 | */ |
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356 | void |
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357 | ncl_clearcommit(struct mount *mp) |
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358 | { |
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359 | struct vnode *vp, *nvp; |
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360 | struct buf *bp, *nbp; |
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361 | struct bufobj *bo; |
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362 | |
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363 | MNT_VNODE_FOREACH_ALL(vp, mp, nvp) { |
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364 | bo = &vp->v_bufobj; |
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365 | vholdl(vp); |
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366 | VI_UNLOCK(vp); |
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367 | BO_LOCK(bo); |
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368 | TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { |
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369 | if (!BUF_ISLOCKED(bp) && |
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370 | (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) |
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371 | == (B_DELWRI | B_NEEDCOMMIT)) |
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372 | bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); |
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373 | } |
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374 | BO_UNLOCK(bo); |
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375 | vdrop(vp); |
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376 | } |
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377 | } |
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378 | |
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379 | /* |
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380 | * Called once to initialize data structures... |
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381 | */ |
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382 | int |
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383 | ncl_init(struct vfsconf *vfsp) |
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384 | { |
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385 | int i; |
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386 | |
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387 | /* Ensure async daemons disabled */ |
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388 | for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { |
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389 | ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE; |
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390 | ncl_iodmount[i] = NULL; |
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391 | } |
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392 | TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL); |
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393 | ncl_nhinit(); /* Init the nfsnode table */ |
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394 | |
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395 | return (0); |
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396 | } |
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