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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>bio_alloc_bioset</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Filesystems API" /><link rel="up" href="ch01s06.html" title="Other Functions" /><link rel="prev" href="re89.html" title="bh_submit_read" /><link rel="next" href="re91.html" title="bio_alloc" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>bio_alloc_bioset</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re89.html">Prev</a> </td><th width="60%" align="center">Other Functions</th><td width="20%" align="right"> <a accesskey="n" href="re91.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="bio_alloc_bioset"><a id="API-bio-alloc-bioset"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>bio_alloc_bioset —
allocate a bio for I/O
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">struct bio * <b class="fsfunc">bio_alloc_bioset </b>(</code></td><td>gfp_t <var class="pdparam">gfp_mask</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">nr_iovecs</var>, </td></tr><tr><td> </td><td>struct bio_set * <var class="pdparam">bs</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3015425"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>gfp_mask</code></em></span></dt><dd><p>
the GFP_ mask given to the slab allocator
</p></dd><dt><span class="term"><em class="parameter"><code>nr_iovecs</code></em></span></dt><dd><p>
number of iovecs to pre-allocate
</p></dd><dt><span class="term"><em class="parameter"><code>bs</code></em></span></dt><dd><p>
the bio_set to allocate from. If <code class="constant">NULL</code>, just use kmalloc
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3015488"></a><h2>Description</h2><p>
bio_alloc_bioset will first try its own mempool to satisfy the allocation.
If <code class="constant">__GFP_WAIT</code> is set then we will block on the internal pool waiting
for a <span class="structname">struct bio</span> to become free. If a <code class="constant">NULL</code> <em class="parameter"><code>bs</code></em> is passed in, we will
fall back to just using <em class="parameter"><code>kmalloc</code></em> to allocate the required memory.
</p><p>
Note that the caller must set ->bi_destructor on succesful return
of a bio, to do the appropriate freeing of the bio once the reference
count drops to zero.
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