1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>__bread_gfp</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Filesystems API"><link rel="up" href="other_functions.html" title="Other Functions"><link rel="prev" href="API-mark-buffer-dirty.html" title="mark_buffer_dirty"><link rel="next" href="API-block-invalidatepage.html" title="block_invalidatepage"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">__bread_gfp</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-mark-buffer-dirty.html">Prev</a>&#160;</td><th width="60%" align="center">Other Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-block-invalidatepage.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API---bread-gfp"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>__bread_gfp &#8212; 
2     reads a specified block and returns the bh
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">struct buffer_head * <b class="fsfunc">__bread_gfp </b>(</code></td><td>struct block_device * <var class="pdparam">bdev</var>, </td></tr><tr><td>&#160;</td><td>sector_t <var class="pdparam">block</var>, </td></tr><tr><td>&#160;</td><td>unsigned <var class="pdparam">size</var>, </td></tr><tr><td>&#160;</td><td>gfp_t <var class="pdparam">gfp</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1102268884"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>bdev</code></em></span></dt><dd><p>
4     the block_device to read from
5    </p></dd><dt><span class="term"><em class="parameter"><code>block</code></em></span></dt><dd><p>
6     number of block
7    </p></dd><dt><span class="term"><em class="parameter"><code>size</code></em></span></dt><dd><p>
8     size (in bytes) to read
9    </p></dd><dt><span class="term"><em class="parameter"><code>gfp</code></em></span></dt><dd><p>
10     page allocation flag
11    </p></dd></dl></div></div><div class="refsect1"><a name="idp1102273556"></a><h2>Description</h2><p>
12   Reads a specified block, and returns buffer head that contains it.
13   The page cache can be allocated from non-movable area
14   not to prevent page migration if you set gfp to zero.
15   It returns NULL if the block was unreadable.
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