#undef _GNU_SOURCE
#include <string.h>
#include <stdio.h>
#include <linux/string.h>

/*
 * The tools so far have been using the strerror_r() GNU variant, that returns
 * a string, be it the buffer passed or something else.
 *
 * But that, besides being tricky in cases where we expect that the function
 * using strerror_r() returns the error formatted in a provided buffer (we have
 * to check if it returned something else and copy that instead), breaks the
 * build on systems not using glibc, like Alpine Linux, where musl libc is
 * used.
 *
 * So, introduce yet another wrapper, str_error_r(), that has the GNU
 * interface, but uses the portable XSI variant of strerror_r(), so that users
 * rest asured that the provided buffer is used and it is what is returned.
 */
char *str_error_r(int errnum, char *buf, size_t buflen)
{
	int err = strerror_r(errnum, buf, buflen);
	if (err)
		snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, %p, %zd)=%d", errnum, buf, buflen, err);
	return buf;
}
/><select name='h' onchange='this.form.submit();'>
<option value='emaclite-cleanup'>emaclite-cleanup</option>
<option value='master'>master</option>
<option value='nds-private-remove' selected='selected'>nds-private-remove</option>
<option value='packet-loop-back'>packet-loop-back</option>
<option value='packet-rx-pump-back'>packet-rx-pump-back</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
<table class='tabs'><tr><td>
<a href='/cgit.cgi/linux/net-next.git/?h=nds-private-remove'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?h=nds-private-remove&amp;id=ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4'>refs</a><a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/'>
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<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>David Sterba &lt;dsterba@suse.com&gt;</td><td class='right'>2017-01-06 14:12:51 +0100</td></tr>
<tr><th>committer</th><td>David Sterba &lt;dsterba@suse.com&gt;</td><td class='right'>2017-01-09 11:24:50 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4'>ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4'>ec90457b5fe8979eeb3f3d63cc6131ed53b1f735</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=2939e1a86f758b55cdba73e29397dd3d94df13bc'>2939e1a86f758b55cdba73e29397dd3d94df13bc</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4&amp;id2=2939e1a86f758b55cdba73e29397dd3d94df13bc'>diff</a>)</td></tr></table>
<div class='commit-subject'>btrfs: fix crash when tracepoint arguments are freed by wq callbacks</div><div class='commit-msg'>Enabling btrfs tracepoints leads to instant crash, as reported. The wq
callbacks could free the memory and the tracepoints started to
dereference the members to get to fs_info.

The proposed fix https://marc.info/?l=linux-btrfs&amp;m=148172436722606&amp;w=2
removed the tracepoints but we could preserve them by passing only the
required data in a safe way.

Fixes: bc074524e123 ("btrfs: prefix fsid to all trace events")
CC: stable@vger.kernel.org # 4.8+
Reported-by: Sebastian Andrzej Siewior &lt;bigeasy@linutronix.de&gt;
Reviewed-by: Qu Wenruo &lt;quwenruo@cn.fujitsu.com&gt;
Signed-off-by: David Sterba &lt;dsterba@suse.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=ac0c7cf8be00f269f82964cf7b144ca3edc5dbc4'>Diffstat</a></div><table summary='diffstat' class='diffstat'>