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<td class='lines'><pre><code><style>.highlight .hll { background-color: #ffffcc }
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<span class="cm"> * linux/fs/bad_inode.c</span>
<span class="cm"> *</span>
<span class="cm"> * Copyright (C) 1997, Stephen Tweedie</span>
<span class="cm"> *</span>
<span class="cm"> * Provide stub functions for unreadable inodes</span>
<span class="cm"> *</span>
<span class="cm"> * Fabian Frederick : August 2003 - All file operations assigned to EIO</span>
<span class="cm"> */</span>
<span class="cp">#include</span> <span class="cpf"><linux/fs.h></span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><linux/export.h></span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><linux/stat.h></span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><linux/time.h></span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><linux/namei.h></span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><linux/poll.h></span><span class="cp"></span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_file_open</span><span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">inode</span><span class="p">,</span> <span class="k">struct</span> <span class="n">file</span> <span class="o">*</span><span class="n">filp</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="k">const</span> <span class="k">struct</span> <span class="n">file_operations</span> <span class="n">bad_file_ops</span> <span class="o">=</span>
<span class="p">{</span>
<span class="p">.</span><span class="n">open</span> <span class="o">=</span> <span class="n">bad_file_open</span><span class="p">,</span>
<span class="p">};</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_create</span> <span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">dir</span><span class="p">,</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span>
<span class="n">umode_t</span> <span class="n">mode</span><span class="p">,</span> <span class="kt">bool</span> <span class="n">excl</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="nf">bad_inode_lookup</span><span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">dir</span><span class="p">,</span>
<span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span> <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="n">ERR_PTR</span><span class="p">(</span><span class="o">-</span><span class="n">EIO</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_link</span> <span class="p">(</span><span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">old_dentry</span><span class="p">,</span> <span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">dir</span><span class="p">,</span>
<span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_unlink</span><span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">dir</span><span class="p">,</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_symlink</span> <span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">dir</span><span class="p">,</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">symname</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_mkdir</span><span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">dir</span><span class="p">,</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span>
<span class="n">umode_t</span> <span class="n">mode</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_rmdir</span> <span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">dir</span><span class="p">,</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_mknod</span> <span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">dir</span><span class="p">,</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span>
<span class="n">umode_t</span> <span class="n">mode</span><span class="p">,</span> <span class="kt">dev_t</span> <span class="n">rdev</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_rename2</span><span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">old_dir</span><span class="p">,</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">old_dentry</span><span class="p">,</span>
<span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">new_dir</span><span class="p">,</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">new_dentry</span><span class="p">,</span>
<span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_readlink</span><span class="p">(</span><span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span> <span class="kt">char</span> <span class="n">__user</span> <span class="o">*</span><span class="n">buffer</span><span class="p">,</span>
<span class="kt">int</span> <span class="n">buflen</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_permission</span><span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">inode</span><span class="p">,</span> <span class="kt">int</span> <span class="n">mask</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_getattr</span><span class="p">(</span><span class="k">struct</span> <span class="n">vfsmount</span> <span class="o">*</span><span class="n">mnt</span><span class="p">,</span> <span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span>
<span class="k">struct</span> <span class="n">kstat</span> <span class="o">*</span><span class="n">stat</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_setattr</span><span class="p">(</span><span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">direntry</span><span class="p">,</span> <span class="k">struct</span> <span class="n">iattr</span> <span class="o">*</span><span class="n">attrs</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_setxattr</span><span class="p">(</span><span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">name</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">void</span> <span class="o">*</span><span class="n">value</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">size</span><span class="p">,</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">ssize_t</span> <span class="nf">bad_inode_getxattr</span><span class="p">(</span><span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">name</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">buffer</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">size</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">ssize_t</span> <span class="nf">bad_inode_listxattr</span><span class="p">(</span><span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">buffer</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">buffer_size</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">bad_inode_removexattr</span><span class="p">(</span><span class="k">struct</span> <span class="n">dentry</span> <span class="o">*</span><span class="n">dentry</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">name</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="n">EIO</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="k">const</span> <span class="k">struct</span> <span class="n">inode_operations</span> <span class="n">bad_inode_ops</span> <span class="o">=</span>
<span class="p">{</span>
<span class="p">.</span><span class="n">create</span> <span class="o">=</span> <span class="n">bad_inode_create</span><span class="p">,</span>
<span class="p">.</span><span class="n">lookup</span> <span class="o">=</span> <span class="n">bad_inode_lookup</span><span class="p">,</span>
<span class="p">.</span><span class="n">link</span> <span class="o">=</span> <span class="n">bad_inode_link</span><span class="p">,</span>
<span class="p">.</span><span class="n">unlink</span> <span class="o">=</span> <span class="n">bad_inode_unlink</span><span class="p">,</span>
<span class="p">.</span><span class="n">symlink</span> <span class="o">=</span> <span class="n">bad_inode_symlink</span><span class="p">,</span>
<span class="p">.</span><span class="n">mkdir</span> <span class="o">=</span> <span class="n">bad_inode_mkdir</span><span class="p">,</span>
<span class="p">.</span><span class="n">rmdir</span> <span class="o">=</span> <span class="n">bad_inode_rmdir</span><span class="p">,</span>
<span class="p">.</span><span class="n">mknod</span> <span class="o">=</span> <span class="n">bad_inode_mknod</span><span class="p">,</span>
<span class="p">.</span><span class="n">rename2</span> <span class="o">=</span> <span class="n">bad_inode_rename2</span><span class="p">,</span>
<span class="p">.</span><span class="n">readlink</span> <span class="o">=</span> <span class="n">bad_inode_readlink</span><span class="p">,</span>
<span class="cm">/* follow_link must be no-op, otherwise unmounting this inode</span>
<span class="cm"> won't work */</span>
<span class="cm">/* put_link returns void */</span>
<span class="cm">/* truncate returns void */</span>
<span class="p">.</span><span class="n">permission</span> <span class="o">=</span> <span class="n">bad_inode_permission</span><span class="p">,</span>
<span class="p">.</span><span class="n">getattr</span> <span class="o">=</span> <span class="n">bad_inode_getattr</span><span class="p">,</span>
<span class="p">.</span><span class="n">setattr</span> <span class="o">=</span> <span class="n">bad_inode_setattr</span><span class="p">,</span>
<span class="p">.</span><span class="n">setxattr</span> <span class="o">=</span> <span class="n">bad_inode_setxattr</span><span class="p">,</span>
<span class="p">.</span><span class="n">getxattr</span> <span class="o">=</span> <span class="n">bad_inode_getxattr</span><span class="p">,</span>
<span class="p">.</span><span class="n">listxattr</span> <span class="o">=</span> <span class="n">bad_inode_listxattr</span><span class="p">,</span>
<span class="p">.</span><span class="n">removexattr</span> <span class="o">=</span> <span class="n">bad_inode_removexattr</span><span class="p">,</span>
<span class="p">};</span>
<span class="cm">/*</span>
<span class="cm"> * When a filesystem is unable to read an inode due to an I/O error in</span>
<span class="cm"> * its read_inode() function, it can call make_bad_inode() to return a</span>
<span class="cm"> * set of stubs which will return EIO errors as required. </span>
<span class="cm"> *</span>
<span class="cm"> * We only need to do limited initialisation: all other fields are</span>
<span class="cm"> * preinitialised to zero automatically.</span>
<span class="cm"> */</span>
<span class="cm">/**</span>
<span class="cm"> * make_bad_inode - mark an inode bad due to an I/O error</span>
<span class="cm"> * @inode: Inode to mark bad</span>
<span class="cm"> *</span>
<span class="cm"> * When an inode cannot be read due to a media or remote network</span>
<span class="cm"> * failure this function makes the inode "bad" and causes I/O operations</span>
<span class="cm"> * on it to fail from this point on.</span>
<span class="cm"> */</span>
<span class="kt">void</span> <span class="nf">make_bad_inode</span><span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">inode</span><span class="p">)</span>
<span class="p">{</span>
<span class="n">remove_inode_hash</span><span class="p">(</span><span class="n">inode</span><span class="p">);</span>
<span class="n">inode</span><span class="o">-></span><span class="n">i_mode</span> <span class="o">=</span> <span class="n">S_IFREG</span><span class="p">;</span>
<span class="n">inode</span><span class="o">-></span><span class="n">i_atime</span> <span class="o">=</span> <span class="n">inode</span><span class="o">-></span><span class="n">i_mtime</span> <span class="o">=</span> <span class="n">inode</span><span class="o">-></span><span class="n">i_ctime</span> <span class="o">=</span>
<span class="n">current_fs_time</span><span class="p">(</span><span class="n">inode</span><span class="o">-></span><span class="n">i_sb</span><span class="p">);</span>
<span class="n">inode</span><span class="o">-></span><span class="n">i_op</span> <span class="o">=</span> <span class="o">&</span><span class="n">bad_inode_ops</span><span class="p">;</span>
<span class="n">inode</span><span class="o">-></span><span class="n">i_fop</span> <span class="o">=</span> <span class="o">&</span><span class="n">bad_file_ops</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">EXPORT_SYMBOL</span><span class="p">(</span><span class="n">make_bad_inode</span><span class="p">);</span>
<span class="cm">/*</span>
<span class="cm"> * This tests whether an inode has been flagged as bad. The test uses</span>
<span class="cm"> * &bad_inode_ops to cover the case of invalidated inodes as well as</span>
<span class="cm"> * those created by make_bad_inode() above.</span>
<span class="cm"> */</span>
<span class="cm">/**</span>
<span class="cm"> * is_bad_inode - is an inode errored</span>
<span class="cm"> * @inode: inode to test</span>
<span class="cm"> *</span>
<span class="cm"> * Returns true if the inode in question has been marked as bad.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">is_bad_inode</span><span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">inode</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">return</span> <span class="p">(</span><span class="n">inode</span><span class="o">-></span><span class="n">i_op</span> <span class="o">==</span> <span class="o">&</span><span class="n">bad_inode_ops</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">EXPORT_SYMBOL</span><span class="p">(</span><span class="n">is_bad_inode</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * iget_failed - Mark an under-construction inode as dead and release it</span>
<span class="cm"> * @inode: The inode to discard</span>
<span class="cm"> *</span>
<span class="cm"> * Mark an under-construction inode as dead and release it.</span>
<span class="cm"> */</span>
<span class="kt">void</span> <span class="nf">iget_failed</span><span class="p">(</span><span class="k">struct</span> <span class="n">inode</span> <span class="o">*</span><span class="n">inode</span><span class="p">)</span>
<span class="p">{</span>
<span class="n">make_bad_inode</span><span class="p">(</span><span class="n">inode</span><span class="p">);</span>
<span class="n">unlock_new_inode</span><span class="p">(</span><span class="n">inode</span><span class="p">);</span>
<span class="n">iput</span><span class="p">(</span><span class="n">inode</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">EXPORT_SYMBOL</span><span class="p">(</span><span class="n">iget_failed</span><span class="p">);</span>
</pre></div>
</code></pre></td></tr></table>
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