/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009 - 2013 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

#include "pcap_io.h"
#include "built_in.h"
#include "die.h"
#include "iosched.h"
#include "ioops.h"

static ssize_t pcap_rw_write(int fd, pcap_pkthdr_t *phdr, enum pcap_type type,
			     const uint8_t *packet, size_t len)
{
	ssize_t ret, hdrsize = pcap_get_hdr_length(phdr, type), hdrlen = 0;

	ret = write_or_die(fd, &phdr->raw, hdrsize);
	if (unlikely(ret != hdrsize))
		panic("Failed to write pkt header!\n");

	hdrlen = pcap_get_length(phdr, type);
	if (unlikely(hdrlen != (ssize_t) len))
		return -EINVAL;

	ret = write_or_die(fd, packet, hdrlen);
	if (unlikely(ret != hdrlen))
		panic("Failed to write pkt payload!\n");

	return hdrsize + hdrlen;
}

static ssize_t pcap_rw_read(int fd, pcap_pkthdr_t *phdr, enum pcap_type type,
			    uint8_t *packet, size_t len)
{
	ssize_t ret, hdrsize = pcap_get_hdr_length(phdr, type), hdrlen = 0;

	ret = read_or_die(fd, &phdr->raw, hdrsize);
	if (unlikely(ret != hdrsize))
		return -EIO;

	hdrlen = pcap_get_length(phdr, type);
	if (unlikely(hdrlen == 0 || hdrlen > (ssize_t) len))
                return -EINVAL;

	ret = read(fd, packet, hdrlen);
	if (unlikely(ret != hdrlen))
		return -EIO;

	return hdrsize + hdrlen;
}

static void pcap_rw_init_once(bool enforce_prio)
{
	if (enforce_prio)
		set_ioprio_rt();
}

static void pcap_rw_fsync(int fd)
{
	fdatasync(fd);
}

const struct pcap_file_ops pcap_rw_ops = {
	.init_once_pcap = pcap_rw_init_once,
	.pull_fhdr_pcap = pcap_generic_pull_fhdr,
	.push_fhdr_pcap = pcap_generic_push_fhdr,
	.read_pcap = pcap_rw_read,
	.write_pcap = pcap_rw_write,
	.fsync_pcap = pcap_rw_fsync,
};
a class='active' href='/cgit.cgi/linux/net-next.git/commit/?id=0ee7a3f6b5b2f22bb69bfc6c60d0ea0777003098'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/?id=0ee7a3f6b5b2f22bb69bfc6c60d0ea0777003098'>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='id' value='0ee7a3f6b5b2f22bb69bfc6c60d0ea0777003098'/><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>Christoph Hellwig &lt;hch@lst.de&gt;</td><td class='right'>2016-10-20 15:44:14 +1100</td></tr>
<tr><th>committer</th><td>Dave Chinner &lt;david@fromorbit.com&gt;</td><td class='right'>2016-10-20 15:44:14 +1100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=0ee7a3f6b5b2f22bb69bfc6c60d0ea0777003098'>0ee7a3f6b5b2f22bb69bfc6c60d0ea0777003098</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=0ee7a3f6b5b2f22bb69bfc6c60d0ea0777003098'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=0ee7a3f6b5b2f22bb69bfc6c60d0ea0777003098'>278d0568b458b31cda20fdafd0c60745b69a34c6</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=f1b8243c55ca6fd2a3898e2f586b8cfcfff684bb'>f1b8243c55ca6fd2a3898e2f586b8cfcfff684bb</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=0ee7a3f6b5b2f22bb69bfc6c60d0ea0777003098&amp;id2=f1b8243c55ca6fd2a3898e2f586b8cfcfff684bb'>diff</a>)</td></tr></table>
<div class='commit-subject'>xfs: don't take the IOLOCK exclusive for direct I/O page invalidation</div><div class='commit-msg'>XFS historically took the iolock exclusive when invalidating pages
before direct I/O operations to protect against writeback starvations.

But this writeback starvation issues has been fixed a long time ago
in the core writeback code, and all other file systems manage to do
without the exclusive lock.  Convert XFS over to avoid the exclusive
lock in this case, and also move to range invalidations like done
by the other file systems.

Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
Reviewed-by: Jan Kara &lt;jack@suse.cz&gt;
Reviewed-by: Carlos Maiolino &lt;cmaiolino@redhat.com&gt;
Signed-off-by: Dave Chinner &lt;david@fromorbit.com&gt;


</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=0ee7a3f6b5b2f22bb69bfc6c60d0ea0777003098'>Diffstat</a></div><table summary='diffstat' class='diffstat'>