📄 super.c
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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/fs/super.c</title><meta http-equiv=Content-Type content="text/html; charset=gb2312"><base href="http://oldlinux.org/lxr/http/"></head><body bgcolor=white><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/fs/super.c">区别标定</a>] [<a href="ident">标识符搜索</a>] [<a href="search">文本搜索</a>] [<a href="find">文件搜索</a>]</div><h1 align=center> <a href="http:/"> OldLinux</a> <a href="http:blurb.html"> 交叉引用</a><br> <a href="source/">Linux</a>/<a href="source/fs/">fs</a>/<a href="source/fs/super.c">super.c</a></h1><div align=center> <b>版本:</b> [<a href="source/fs/super.c?v=1.0">1.0</a>] [<a href="source/fs/super.c?v=0.99.11">0.99.11</a>] [<a href="source/fs/super.c?v=0.99">0.99</a>] [<a href="source/fs/super.c?v=0.97">0.97</a>] [<a href="source/fs/super.c?v=0.96a">0.96a</a>] [<a href="source/fs/super.c?v=0.95">0.95</a>] [<a href="source/fs/super.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/fs/super.c?v=0.01">0.01</a>] <br> <b>体系结构:</b> [<b><i>i386</i></b>] <br></div><hr><pre> <a name=L1 href="source/fs/super.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/fs/super.c#L2">2</a> <b><i> * linux/fs/super.c</i></b> <a name=L3 href="source/fs/super.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/fs/super.c#L4">4</a> <b><i> * (C) 1991 Linus Torvalds</i></b> <a name=L5 href="source/fs/super.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/fs/super.c#L6">6</a> <a name=L7 href="source/fs/super.c#L7">7</a> <b><i>/*</i></b> <a name=L8 href="source/fs/super.c#L8">8</a> <b><i> * super.c contains code to handle the super-block tables.</i></b> <a name=L9 href="source/fs/super.c#L9">9</a> <b><i> */</i></b> <a name=L10 href="source/fs/super.c#L10">10</a> #include <linux/config.h> <a name=L11 href="source/fs/super.c#L11">11</a> #include <linux/sched.h> <a name=L12 href="source/fs/super.c#L12">12</a> #include <linux/kernel.h> <a name=L13 href="source/fs/super.c#L13">13</a> #include <asm/system.h> <a name=L14 href="source/fs/super.c#L14">14</a> <a name=L15 href="source/fs/super.c#L15">15</a> #include <errno.h> <a name=L16 href="source/fs/super.c#L16">16</a> #include <sys/stat.h> <a name=L17 href="source/fs/super.c#L17">17</a> <a name=L18 href="source/fs/super.c#L18">18</a> int <a href="ident?i=sync_dev">sync_dev</a>(int dev); <a name=L19 href="source/fs/super.c#L19">19</a> void <a href="ident?i=wait_for_keypress">wait_for_keypress</a>(void); <a name=L20 href="source/fs/super.c#L20">20</a> <a name=L21 href="source/fs/super.c#L21">21</a> <b><i>/* set_bit uses setb, as gas doesn't recognize setc */</i></b> <a name=L22 href="source/fs/super.c#L22">22</a> #define <a href="ident?i=set_bit">set_bit</a>(bitnr,addr) ({ \ <a name=L23 href="source/fs/super.c#L23">23</a> register int __res __asm__(<i>"ax"</i>); \ <a name=L24 href="source/fs/super.c#L24">24</a> __asm__(<i>"bt %2,%3;setb %%al"</i>:<i>"=a"</i> (__res):<i>"a"</i> (0),<i>"r"</i> (bitnr),<i>"m"</i> (*(addr))); \ <a name=L25 href="source/fs/super.c#L25">25</a> __res; }) <a name=L26 href="source/fs/super.c#L26">26</a> <a name=L27 href="source/fs/super.c#L27">27</a> struct <a href="ident?i=super_block">super_block</a> <a href="ident?i=super_block">super_block</a>[<a href="ident?i=NR_SUPER">NR_SUPER</a>]; <a name=L28 href="source/fs/super.c#L28">28</a> <b><i>/* this is initialized in init/main.c */</i></b> <a name=L29 href="source/fs/super.c#L29">29</a> int <a href="ident?i=ROOT_DEV">ROOT_DEV</a> = 0; <a name=L30 href="source/fs/super.c#L30">30</a> <a name=L31 href="source/fs/super.c#L31">31</a> static void <a href="ident?i=lock_super">lock_super</a>(struct <a href="ident?i=super_block">super_block</a> * sb) <a name=L32 href="source/fs/super.c#L32">32</a> { <a name=L33 href="source/fs/super.c#L33">33</a> <a href="ident?i=cli">cli</a>(); <a name=L34 href="source/fs/super.c#L34">34</a> while (sb->s_lock) <a name=L35 href="source/fs/super.c#L35">35</a> <a href="ident?i=sleep_on">sleep_on</a>(&(sb->s_wait)); <a name=L36 href="source/fs/super.c#L36">36</a> sb->s_lock = 1; <a name=L37 href="source/fs/super.c#L37">37</a> <a href="ident?i=sti">sti</a>(); <a name=L38 href="source/fs/super.c#L38">38</a> } <a name=L39 href="source/fs/super.c#L39">39</a> <a name=L40 href="source/fs/super.c#L40">40</a> static void <a href="ident?i=free_super">free_super</a>(struct <a href="ident?i=super_block">super_block</a> * sb) <a name=L41 href="source/fs/super.c#L41">41</a> { <a name=L42 href="source/fs/super.c#L42">42</a> <a href="ident?i=cli">cli</a>(); <a name=L43 href="source/fs/super.c#L43">43</a> sb->s_lock = 0; <a name=L44 href="source/fs/super.c#L44">44</a> <a href="ident?i=wake_up">wake_up</a>(&(sb->s_wait)); <a name=L45 href="source/fs/super.c#L45">45</a> <a href="ident?i=sti">sti</a>(); <a name=L46 href="source/fs/super.c#L46">46</a> } <a name=L47 href="source/fs/super.c#L47">47</a> <a name=L48 href="source/fs/super.c#L48">48</a> static void <a href="ident?i=wait_on_super">wait_on_super</a>(struct <a href="ident?i=super_block">super_block</a> * sb) <a name=L49 href="source/fs/super.c#L49">49</a> { <a name=L50 href="source/fs/super.c#L50">50</a> <a href="ident?i=cli">cli</a>(); <a name=L51 href="source/fs/super.c#L51">51</a> while (sb->s_lock) <a name=L52 href="source/fs/super.c#L52">52</a> <a href="ident?i=sleep_on">sleep_on</a>(&(sb->s_wait)); <a name=L53 href="source/fs/super.c#L53">53</a> <a href="ident?i=sti">sti</a>(); <a name=L54 href="source/fs/super.c#L54">54</a> } <a name=L55 href="source/fs/super.c#L55">55</a> <a name=L56 href="source/fs/super.c#L56">56</a> struct <a href="ident?i=super_block">super_block</a> * <a href="ident?i=get_super">get_super</a>(int dev) <a name=L57 href="source/fs/super.c#L57">57</a> { <a name=L58 href="source/fs/super.c#L58">58</a> struct <a href="ident?i=super_block">super_block</a> * s; <a name=L59 href="source/fs/super.c#L59">59</a> <a name=L60 href="source/fs/super.c#L60">60</a> if (!dev) <a name=L61 href="source/fs/super.c#L61">61</a> return <a href="ident?i=NULL">NULL</a>; <a name=L62 href="source/fs/super.c#L62">62</a> s = 0+<a href="ident?i=super_block">super_block</a>; <a name=L63 href="source/fs/super.c#L63">63</a> while (s < <a href="ident?i=NR_SUPER">NR_SUPER</a>+<a href="ident?i=super_block">super_block</a>) <a name=L64 href="source/fs/super.c#L64">64</a> if (s->s_dev == dev) { <a name=L65 href="source/fs/super.c#L65">65</a> <a href="ident?i=wait_on_super">wait_on_super</a>(s); <a name=L66 href="source/fs/super.c#L66">66</a> if (s->s_dev == dev) <a name=L67 href="source/fs/super.c#L67">67</a> return s; <a name=L68 href="source/fs/super.c#L68">68</a> s = 0+<a href="ident?i=super_block">super_block</a>; <a name=L69 href="source/fs/super.c#L69">69</a> } else <a name=L70 href="source/fs/super.c#L70">70</a> s++; <a name=L71 href="source/fs/super.c#L71">71</a> return <a href="ident?i=NULL">NULL</a>; <a name=L72 href="source/fs/super.c#L72">72</a> } <a name=L73 href="source/fs/super.c#L73">73</a> <a name=L74 href="source/fs/super.c#L74">74</a> void <a href="ident?i=put_super">put_super</a>(int dev) <a name=L75 href="source/fs/super.c#L75">75</a> { <a name=L76 href="source/fs/super.c#L76">76</a> struct <a href="ident?i=super_block">super_block</a> * sb; <a name=L77 href="source/fs/super.c#L77">77</a> struct <a href="ident?i=m_inode">m_inode</a> * inode; <a name=L78 href="source/fs/super.c#L78">78</a> int i; <a name=L79 href="source/fs/super.c#L79">79</a> <a name=L80 href="source/fs/super.c#L80">80</a> if (dev == <a href="ident?i=ROOT_DEV">ROOT_DEV</a>) { <a name=L81 href="source/fs/super.c#L81">81</a> <a href="ident?i=printk">printk</a>(<i>"root diskette changed: prepare for armageddon\n\r"</i>); <a name=L82 href="source/fs/super.c#L82">82</a> return; <a name=L83 href="source/fs/super.c#L83">83</a> } <a name=L84 href="source/fs/super.c#L84">84</a> if (!(sb = <a href="ident?i=get_super">get_super</a>(dev))) <a name=L85 href="source/fs/super.c#L85">85</a> return; <a name=L86 href="source/fs/super.c#L86">86</a> if (sb->s_imount) { <a name=L87 href="source/fs/super.c#L87">87</a> <a href="ident?i=printk">printk</a>(<i>"Mounted disk changed - tssk, tssk\n\r"</i>); <a name=L88 href="source/fs/super.c#L88">88</a> return; <a name=L89 href="source/fs/super.c#L89">89</a> } <a name=L90 href="source/fs/super.c#L90">90</a> <a href="ident?i=lock_super">lock_super</a>(sb); <a name=L91 href="source/fs/super.c#L91">91</a> sb->s_dev = 0; <a name=L92 href="source/fs/super.c#L92">92</a> for(i=0;i<<a href="ident?i=I_MAP_SLOTS">I_MAP_SLOTS</a>;i++) <a name=L93 href="source/fs/super.c#L93">93</a> <a href="ident?i=brelse">brelse</a>(sb->s_imap[i]); <a name=L94 href="source/fs/super.c#L94">94</a> for(i=0;i<<a href="ident?i=Z_MAP_SLOTS">Z_MAP_SLOTS</a>;i++) <a name=L95 href="source/fs/super.c#L95">95</a> <a href="ident?i=brelse">brelse</a>(sb->s_zmap[i]); <a name=L96 href="source/fs/super.c#L96">96</a> <a href="ident?i=free_super">free_super</a>(sb); <a name=L97 href="source/fs/super.c#L97">97</a> return; <a name=L98 href="source/fs/super.c#L98">98</a> } <a name=L99 href="source/fs/super.c#L99">99</a> <a name=L100 href="source/fs/super.c#L100">100</a> static struct <a href="ident?i=super_block">super_block</a> * <a href="ident?i=read_super">read_super</a>(int dev)<a name=L101 href="source/fs/super.c#L101">101</a> {<a name=L102 href="source/fs/super.c#L102">102</a> struct <a href="ident?i=super_block">super_block</a> * s;<a name=L103 href="source/fs/super.c#L103">103</a> struct <a href="ident?i=buffer_head">buffer_head</a> * bh;<a name=L104 href="source/fs/super.c#L104">104</a> int i,block;<a name=L105 href="source/fs/super.c#L105">105</a> <a name=L106 href="source/fs/super.c#L106">106</a> if (!dev)<a name=L107 href="source/fs/super.c#L107">107</a> return <a href="ident?i=NULL">NULL</a>;<a name=L108 href="source/fs/super.c#L108">108</a> <a href="ident?i=check_disk_change">check_disk_change</a>(dev);<a name=L109 href="source/fs/super.c#L109">109</a> if (s = <a href="ident?i=get_super">get_super</a>(dev))<a name=L110 href="source/fs/super.c#L110">110</a> return s;<a name=L111 href="source/fs/super.c#L111">111</a> for (s = 0+<a href="ident?i=super_block">super_block</a> ;; s++) {<a name=L112 href="source/fs/super.c#L112">112</a> if (s >= <a href="ident?i=NR_SUPER">NR_SUPER</a>+<a href="ident?i=super_block">super_block</a>)<a name=L113 href="source/fs/super.c#L113">113</a> return <a href="ident?i=NULL">NULL</a>;<a name=L114 href="source/fs/super.c#L114">114</a> if (!s->s_dev)<a name=L115 href="source/fs/super.c#L115">115</a> break;<a name=L116 href="source/fs/super.c#L116">116</a> }<a name=L117 href="source/fs/super.c#L117">117</a> s->s_dev = dev;<a name=L118 href="source/fs/super.c#L118">118</a> s->s_isup = <a href="ident?i=NULL">NULL</a>;<a name=L119 href="source/fs/super.c#L119">119</a> s->s_imount = <a href="ident?i=NULL">NULL</a>;<a name=L120 href="source/fs/super.c#L120">120</a> s->s_time = 0;<a name=L121 href="source/fs/super.c#L121">121</a> s->s_rd_only = 0;<a name=L122 href="source/fs/super.c#L122">122</a> s->s_dirt = 0;<a name=L123 href="source/fs/super.c#L123">123</a> <a href="ident?i=lock_super">lock_super</a>(s);<a name=L124 href="source/fs/super.c#L124">124</a> if (!(bh = <a href="ident?i=bread">bread</a>(dev,1))) {<a name=L125 href="source/fs/super.c#L125">125</a> s->s_dev=0;<a name=L126 href="source/fs/super.c#L126">126</a> <a href="ident?i=free_super">free_super</a>(s);<a name=L127 href="source/fs/super.c#L127">127</a> return <a href="ident?i=NULL">NULL</a>;<a name=L128 href="source/fs/super.c#L128">128</a> }<a name=L129 href="source/fs/super.c#L129">129</a> *((struct <a href="ident?i=d_super_block">d_super_block</a> *) s) =<a name=L130 href="source/fs/super.c#L130">130</a> *((struct <a href="ident?i=d_super_block">d_super_block</a> *) bh->b_data);<a name=L131 href="source/fs/super.c#L131">131</a> <a href="ident?i=brelse">brelse</a>(bh);⌨️ 快捷键说明
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