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<p class="MsoNormal"><span lang="EN-US">Hi</span><span style="font-family:宋体">，</span><span lang="EN-US"></span></p>
<p class="MsoNormal"><span lang="EN-US"> In Linux 3.18 kenrel, when fstrim a ocfs2 file system, fstrim shows IO error. Some logs in syslog:</span></p>
<p class="MsoNormal"><span lang="EN-US"> attempt to access beyond end of device</span></p>
<p class="MsoNormal"><span lang="EN-US"> sdb: rw=129, want=8390656, limit=8388608</span></p>
<p class="MsoNormal"><span lang="EN-US"> (fstrim,36298,6):ocfs2_trim_group:7274 ERROR: status = -5</span></p>
<p class="MsoNormal"><span lang="EN-US"> (fstrim,36298,6):ocfs2_trim_fs:7374 ERROR: status = -5</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> In ocfs2_trim_group, next shoud compare with ip_clusters before call ocfs2_trim_extent.</span></p>
<p class="MsoNormal"><span lang="EN-US"> while (start < max) {</span></p>
<p class="MsoNormal"><span lang="EN-US"> start = ocfs2_find_next_zero_bit(bitmap, max, start);</span></p>
<p class="MsoNormal"><span lang="EN-US"> if (start >= max)</span></p>
<p class="MsoNormal"><span lang="EN-US"> break;</span></p>
<p class="MsoNormal"><span lang="EN-US"> next = ocfs2_find_next_bit(bitmap, max, start);</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> /* next should compare with ip_clusters, ensure within device. But how to get ip_clusters here? Should pass inode from the caller? */</span></p>
<p class="MsoNormal"><span lang="EN-US"> if (next > ip_clusters)</span></p>
<p class="MsoNormal"><span lang="EN-US"> next = ip_clusters;</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> if (next > start && (next - start) >= minbits) {</span></p>
<p class="MsoNormal"><span lang="EN-US"> ret = ocfs2_trim_extent(sb, gd,</span></p>
<p class="MsoNormal"><span lang="EN-US"> start, next - start);</span></p>
<p class="MsoNormal"><span lang="EN-US"> if (ret < 0) {</span></p>
<p class="MsoNormal"><span lang="EN-US"> mlog_errno(ret);</span></p>
<p class="MsoNormal"><span lang="EN-US"> break;</span></p>
<p class="MsoNormal"><span lang="EN-US"> }</span></p>
<p class="MsoNormal"><span lang="EN-US"> count += next - start;</span></p>
<p class="MsoNormal"><span lang="EN-US"> }</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,</span></p>
<p class="MsoNormal"><span lang="EN-US">Changlimin</span></p>
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