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<div class="title">invalidate_path.c File Reference</div> </div>
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<div class="textblock"><code>#include <<a class="el" href="fuse_8h_source.html">fuse.h</a>></code><br />
<code>#include <<a class="el" href="fuse__lowlevel_8h_source.html">fuse_lowlevel.h</a>></code><br />
<code>#include <stdio.h></code><br />
<code>#include <stdlib.h></code><br />
<code>#include <string.h></code><br />
<code>#include <errno.h></code><br />
<code>#include <fcntl.h></code><br />
<code>#include <assert.h></code><br />
<code>#include <stddef.h></code><br />
<code>#include <unistd.h></code><br />
<code>#include <pthread.h></code><br />
</div>
<p><a href="invalidate__path_8c_source.html">Go to the source code of this file.</a></p>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>This example implements a file system with two files:</p><ul>
<li>'current-time', whose contents change dynamically: it always contains the current time (same as in <a class="el" href="notify__inval__inode_8c.html">notify_inval_inode.c</a>).</li>
<li>'growing', whose size changes dynamically, growing by 1 byte after each update. This aims to check if cached file metadata is also invalidated.</li>
</ul>
<h2>Compilation</h2>
<pre class="fragment">gcc -Wall invalidate_path.c `pkg-config fuse3 --cflags --libs` -o invalidate_path
</pre><h2>Source code</h2>
<div class="fragment"><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> FUSE: Filesystem in Userspace</span></div><div class="line"><span class="comment"> Copyright (C) 2016 Nikolaus Rath <Nikolaus@rath.org></span></div><div class="line"><span class="comment"> (C) 2017 EditShare LLC <slawek.rudnicki@editshare.com></span></div><div class="line"><span class="comment"></span></div><div class="line"><span class="comment"> This program can be distributed under the terms of the GNU GPLv2.</span></div><div class="line"><span class="comment"> See the file COPYING.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"></div><div class="line"><span class="preprocessor">#define FUSE_USE_VERSION 34</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <<a class="code" href="fuse_8h.html">fuse.h</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="fuse__lowlevel_8h.html">fuse_lowlevel.h</a>></span> <span class="comment">/* for fuse_cmdline_opts */</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <stdio.h></span></div><div class="line"><span class="preprocessor">#include <stdlib.h></span></div><div class="line"><span class="preprocessor">#include <string.h></span></div><div class="line"><span class="preprocessor">#include <errno.h></span></div><div class="line"><span class="preprocessor">#include <fcntl.h></span></div><div class="line"><span class="preprocessor">#include <assert.h></span></div><div class="line"><span class="preprocessor">#include <stddef.h></span></div><div class="line"><span class="preprocessor">#include <unistd.h></span></div><div class="line"><span class="preprocessor">#include <pthread.h></span></div><div class="line"></div><div class="line"><span class="comment">/* We can't actually tell the kernel that there is no</span></div><div class="line"><span class="comment"> timeout, so we just send a big value */</span></div><div class="line"><span class="preprocessor">#define NO_TIMEOUT 500000</span></div><div class="line"></div><div class="line"><span class="preprocessor">#define MAX_STR_LEN 128</span></div><div class="line"><span class="preprocessor">#define TIME_FILE_NAME "current_time"</span></div><div class="line"><span class="preprocessor">#define TIME_FILE_INO 2</span></div><div class="line"><span class="preprocessor">#define GROW_FILE_NAME "growing"</span></div><div class="line"><span class="preprocessor">#define GROW_FILE_INO 3</span></div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">char</span> time_file_contents[MAX_STR_LEN];</div><div class="line"><span class="keyword">static</span> <span class="keywordtype">size_t</span> grow_file_size;</div><div class="line"></div><div class="line"><span class="comment">/* Command line parsing */</span></div><div class="line"><span class="keyword">struct </span>options {</div><div class="line"> <span class="keywordtype">int</span> no_notify;</div><div class="line"> <span class="keywordtype">int</span> update_interval;</div><div class="line">};</div><div class="line"><span class="keyword">static</span> <span class="keyword">struct </span>options options = {</div><div class="line"> .no_notify = 0,</div><div class="line"> .update_interval = 1,</div><div class="line">};</div><div class="line"></div><div class="line"><span class="preprocessor">#define OPTION(t, p) { t, offsetof(struct options, p), 1 }</span></div><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">struct </span><a class="code" href="structfuse__opt.html">fuse_opt</a> option_spec[] = {</div><div class="line"> OPTION(<span class="stringliteral">"--no-notify"</span>, no_notify),</div><div class="line"> OPTION(<span class="stringliteral">"--update-interval=%d"</span>, update_interval),</div><div class="line"> <a class="code" href="fuse__opt_8h.html#aca35962e17d189ceb5447f8eea11bd33">FUSE_OPT_END</a></div><div class="line">};</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> *xmp_init(<span class="keyword">struct</span> <a class="code" href="structfuse__conn__info.html">fuse_conn_info</a> *conn, <span class="keyword">struct</span> <a class="code" href="structfuse__config.html">fuse_config</a> *cfg)</div><div class="line">{</div><div class="line"> (void) conn;</div><div class="line"> cfg-><a class="code" href="structfuse__config.html#a9bc2e3b1d8a4410215cd620553e61b62">entry_timeout</a> = NO_TIMEOUT;</div><div class="line"> cfg-><a class="code" href="structfuse__config.html#aeba85551d9498ca85fa2bf13b5e78eda">attr_timeout</a> = NO_TIMEOUT;</div><div class="line"> cfg-><a class="code" href="structfuse__config.html#ab4205f7343afe6e20edfbfb64cb90248">negative_timeout</a> = 0;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> NULL;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_getattr(<span class="keyword">const</span> <span class="keywordtype">char</span> *path,</div><div class="line"> <span class="keyword">struct</span> stat *stbuf, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a>* fi) {</div><div class="line"> (void) fi;</div><div class="line"> <span class="keywordflow">if</span> (strcmp(path, <span class="stringliteral">"/"</span>) == 0) {</div><div class="line"> stbuf->st_ino = 1;</div><div class="line"> stbuf->st_mode = S_IFDIR | 0755;</div><div class="line"> stbuf->st_nlink = 1;</div><div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strcmp(path, <span class="stringliteral">"/"</span> TIME_FILE_NAME) == 0) {</div><div class="line"> stbuf->st_ino = TIME_FILE_INO;</div><div class="line"> stbuf->st_mode = S_IFREG | 0444;</div><div class="line"> stbuf->st_nlink = 1;</div><div class="line"> stbuf->st_size = strlen(time_file_contents);</div><div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strcmp(path, <span class="stringliteral">"/"</span> GROW_FILE_NAME) == 0) {</div><div class="line"> stbuf->st_ino = GROW_FILE_INO;</div><div class="line"> stbuf->st_mode = S_IFREG | 0444;</div><div class="line"> stbuf->st_nlink = 1;</div><div class="line"> stbuf->st_size = grow_file_size;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> <span class="keywordflow">return</span> -ENOENT;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_readdir(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">void</span> *buf, <a class="code" href="fuse_8h.html#a7dd132de66a5cc2add2a4eff5d435660">fuse_fill_dir_t</a> filler,</div><div class="line"> off_t offset, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi,</div><div class="line"> <span class="keyword">enum</span> <a class="code" href="fuse_8h.html#af2bcf2a473b41b3cc8da8c079656a074">fuse_readdir_flags</a> flags) {</div><div class="line"> (void) fi;</div><div class="line"> (void) offset;</div><div class="line"> (void) flags;</div><div class="line"> <span class="keywordflow">if</span> (strcmp(path, <span class="stringliteral">"/"</span>) != 0) {</div><div class="line"> <span class="keywordflow">return</span> -ENOTDIR;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> (void) filler;</div><div class="line"> (void) buf;</div><div class="line"> <span class="keyword">struct </span>stat file_stat;</div><div class="line"> xmp_getattr(<span class="stringliteral">"/"</span> TIME_FILE_NAME, &file_stat, NULL);</div><div class="line"> filler(buf, TIME_FILE_NAME, &file_stat, 0, 0);</div><div class="line"> xmp_getattr(<span class="stringliteral">"/"</span> GROW_FILE_NAME, &file_stat, NULL);</div><div class="line"> filler(buf, GROW_FILE_NAME, &file_stat, 0, 0);</div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_open(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi) {</div><div class="line"> (void) path;</div><div class="line"> <span class="comment">/* Make cache persistent even if file is closed,</span></div><div class="line"><span class="comment"> this makes it easier to see the effects */</span></div><div class="line"> fi-><a class="code" href="structfuse__file__info.html#a23a64eaecbf83f99aba8ee79e6de2780">keep_cache</a> = 1;</div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_read(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> size, off_t offset,</div><div class="line"> <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi) {</div><div class="line"> (void) fi;</div><div class="line"> (void) offset;</div><div class="line"> <span class="keywordflow">if</span> (strcmp(path, <span class="stringliteral">"/"</span> TIME_FILE_NAME) == 0) {</div><div class="line"> <span class="keywordtype">int</span> file_length = strlen(time_file_contents);</div><div class="line"> <span class="keywordtype">int</span> to_copy = offset + size <= file_length</div><div class="line"> ? size</div><div class="line"> : file_length - offset;</div><div class="line"> memcpy(buf, time_file_contents, to_copy);</div><div class="line"> <span class="keywordflow">return</span> to_copy;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> assert(strcmp(path, <span class="stringliteral">"/"</span> GROW_FILE_NAME) == 0);</div><div class="line"> <span class="keywordtype">int</span> to_copy = offset + size <= grow_file_size</div><div class="line"> ? size</div><div class="line"> : grow_file_size - offset;</div><div class="line"> memset(buf, <span class="charliteral">'x'</span>, to_copy);</div><div class="line"> <span class="keywordflow">return</span> to_copy;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">struct </span><a class="code" href="structfuse__operations.html">fuse_operations</a> xmp_oper = {</div><div class="line"> .<a class="code" href="structfuse__operations.html#a0ad1f7c4105ee062528c767da88060f0">init</a> = xmp_init,</div><div class="line"> .getattr = xmp_getattr,</div><div class="line"> .readdir = xmp_readdir,</div><div class="line"> .open = xmp_open,</div><div class="line"> .read = xmp_read,</div><div class="line">};</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> update_fs(<span class="keywordtype">void</span>) {</div><div class="line"> <span class="keyword">static</span> <span class="keywordtype">int</span> count = 0;</div><div class="line"> <span class="keyword">struct </span>tm *now;</div><div class="line"> time_t t;</div><div class="line"> t = time(NULL);</div><div class="line"> now = localtime(&t);</div><div class="line"> assert(now != NULL);</div><div class="line"></div><div class="line"> <span class="keywordtype">int</span> time_file_size = strftime(time_file_contents, MAX_STR_LEN,</div><div class="line"> <span class="stringliteral">"The current time is %H:%M:%S\n"</span>, now);</div><div class="line"> assert(time_file_size != 0);</div><div class="line"></div><div class="line"> grow_file_size = count++;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> invalidate(<span class="keyword">struct</span> fuse *fuse, <span class="keyword">const</span> <span class="keywordtype">char</span> *path) {</div><div class="line"> <span class="keywordtype">int</span> status = <a class="code" href="fuse_8h.html#a56c1dfbdfaf10818dbc6c2ca6264f19a">fuse_invalidate_path</a>(fuse, path);</div><div class="line"> <span class="keywordflow">if</span> (status == -ENOENT) {</div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line"> } <span class="keywordflow">else</span> {</div><div class="line"> <span class="keywordflow">return</span> status;</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span>* update_fs_loop(<span class="keywordtype">void</span> *data) {</div><div class="line"> <span class="keyword">struct </span>fuse *fuse = (<span class="keyword">struct </span>fuse*) data;</div><div class="line"></div><div class="line"> <span class="keywordflow">while</span> (1) {</div><div class="line"> update_fs();</div><div class="line"> <span class="keywordflow">if</span> (!options.no_notify) {</div><div class="line"> assert(invalidate(fuse, <span class="stringliteral">"/"</span> TIME_FILE_NAME) == 0);</div><div class="line"> assert(invalidate(fuse, <span class="stringliteral">"/"</span> GROW_FILE_NAME) == 0);</div><div class="line"> }</div><div class="line"> sleep(options.update_interval);</div><div class="line"> }</div><div class="line"> <span class="keywordflow">return</span> NULL;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> show_help(<span class="keyword">const</span> <span class="keywordtype">char</span> *progname)</div><div class="line">{</div><div class="line"> printf(<span class="stringliteral">"usage: %s [options] <mountpoint>\n\n"</span>, progname);</div><div class="line"> printf(<span class="stringliteral">"File-system specific options:\n"</span></div><div class="line"> <span class="stringliteral">" --update-interval=<secs> Update-rate of file system contents\n"</span></div><div class="line"> <span class="stringliteral">" --no-notify Disable kernel notifications\n"</span></div><div class="line"> <span class="stringliteral">"\n"</span>);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[]) {</div><div class="line"> <span class="keyword">struct </span><a class="code" href="structfuse__args.html">fuse_args</a> args = <a class="code" href="fuse__opt_8h.html#a9bea40fe56b18be9aa110185ab7387ed">FUSE_ARGS_INIT</a>(argc, argv);</div><div class="line"> <span class="keyword">struct </span>fuse *fuse;</div><div class="line"> <span class="keyword">struct </span>fuse_cmdline_opts opts;</div><div class="line"> <span class="keyword">struct </span><a class="code" href="structfuse__loop__config.html">fuse_loop_config</a> config;</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> <span class="comment">/* Initialize the files */</span></div><div class="line"> update_fs();</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (<a class="code" href="fuse__opt_8h.html#a539ef1f571c34f516c60c4cbe2901c0e">fuse_opt_parse</a>(&args, &options, option_spec, NULL) == -1)</div><div class="line"> <span class="keywordflow">return</span> 1;</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (<a class="code" href="fuse__lowlevel_8h.html#a8421a0cb3b6fb7013c7272c6997d1e08">fuse_parse_cmdline</a>(&args, &opts) != 0)</div><div class="line"> <span class="keywordflow">return</span> 1;</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (opts.show_version) {</div><div class="line"> printf(<span class="stringliteral">"FUSE library version %s\n"</span>, <a class="code" href="fuse__common_8h.html#ac52e27388a7c16eb509173908e5eebd0">fuse_pkgversion</a>());</div><div class="line"> <a class="code" href="fuse__lowlevel_8h.html#ac6e2d0fde62dcf4f0e57afeabeefd7b1">fuse_lowlevel_version</a>();</div><div class="line"> res = 0;</div><div class="line"> <span class="keywordflow">goto</span> out1;</div><div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (opts.show_help) {</div><div class="line"> show_help(argv[0]);</div><div class="line"> <a class="code" href="fuse__lowlevel_8h.html#a7235e3a2d1c780d5e0beaee13c81529f">fuse_cmdline_help</a>();</div><div class="line"> <a class="code" href="fuse_8h.html#a9cef8443ae22c4bcc800d7c45f1496fe">fuse_lib_help</a>(&args);</div><div class="line"> res = 0;</div><div class="line"> <span class="keywordflow">goto</span> out1;</div><div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!opts.mountpoint) {</div><div class="line"> fprintf(stderr, <span class="stringliteral">"error: no mountpoint specified\n"</span>);</div><div class="line"> res = 1;</div><div class="line"> <span class="keywordflow">goto</span> out1;</div><div class="line"> }</div><div class="line"></div><div class="line"> fuse = <a class="code" href="fuse_8h.html#ad866b0fd4d81bdbf3e737f7273ba4520">fuse_new</a>(&args, &xmp_oper, <span class="keyword">sizeof</span>(xmp_oper), NULL);</div><div class="line"> <span class="keywordflow">if</span> (fuse == NULL) {</div><div class="line"> res = 1;</div><div class="line"> <span class="keywordflow">goto</span> out1;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (<a class="code" href="fuse_8h.html#a04baffd979b06663ae9590e34a48b55f">fuse_mount</a>(fuse,opts.mountpoint) != 0) {</div><div class="line"> res = 1;</div><div class="line"> <span class="keywordflow">goto</span> out2;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (<a class="code" href="fuse__common_8h.html#af1857d2209952f49a762aff39f3cd8bd">fuse_daemonize</a>(opts.foreground) != 0) {</div><div class="line"> res = 1;</div><div class="line"> <span class="keywordflow">goto</span> out3;</div><div class="line"> }</div><div class="line"></div><div class="line"> pthread_t updater; <span class="comment">/* Start thread to update file contents */</span></div><div class="line"> <span class="keywordtype">int</span> ret = pthread_create(&updater, NULL, update_fs_loop, (<span class="keywordtype">void</span> *) fuse);</div><div class="line"> <span class="keywordflow">if</span> (ret != 0) {</div><div class="line"> fprintf(stderr, <span class="stringliteral">"pthread_create failed with %s\n"</span>, strerror(ret));</div><div class="line"> <span class="keywordflow">return</span> 1;</div><div class="line"> };</div><div class="line"></div><div class="line"> <span class="keyword">struct </span>fuse_session *se = <a class="code" href="fuse_8h.html#a03baa193b5bfcbe625afbc62e9b97e91">fuse_get_session</a>(fuse);</div><div class="line"> <span class="keywordflow">if</span> (<a class="code" href="fuse__common_8h.html#a292dccc3c7b1799cb054efa2ba0c774b">fuse_set_signal_handlers</a>(se) != 0) {</div><div class="line"> res = 1;</div><div class="line"> <span class="keywordflow">goto</span> out3;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (opts.singlethread)</div><div class="line"> res = <a class="code" href="fuse_8h.html#a6ea805c47ccc960497dfd64e12081159">fuse_loop</a>(fuse);</div><div class="line"> <span class="keywordflow">else</span> {</div><div class="line"> config.clone_fd = opts.clone_fd;</div><div class="line"> config.max_idle_threads = opts.max_idle_threads;</div><div class="line"> res = <a class="code" href="fuse_8h.html#aceafd2ce10ea8fc0abbc071df64b010f">fuse_loop_mt</a>(fuse, &config);</div><div class="line"> }</div><div class="line"> <span class="keywordflow">if</span> (res)</div><div class="line"> res = 1;</div><div class="line"></div><div class="line"> <a class="code" href="fuse__common_8h.html#aeb674bbc11074c4fe520b952d6bfdd30">fuse_remove_signal_handlers</a>(se);</div><div class="line">out3:</div><div class="line"> <a class="code" href="fuse_8h.html#aade4d93e323c341fe2859d759e9cb8d8">fuse_unmount</a>(fuse);</div><div class="line">out2:</div><div class="line"> <a class="code" href="fuse_8h.html#a0d47cac8a295efd5370d7af059e4d14f">fuse_destroy</a>(fuse);</div><div class="line">out1:</div><div class="line"> free(opts.mountpoint);</div><div class="line"> <a class="code" href="fuse__opt_8h.html#a2cdf272429ab3869a5162976141b287d">fuse_opt_free_args</a>(&args);</div><div class="line"> <span class="keywordflow">return</span> res;</div><div class="line">}</div></div><!-- fragment -->
<p class="definition">Definition in file <a class="el" href="invalidate__path_8c_source.html">invalidate_path.c</a>.</p>
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