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/*
Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "afr.h"
#include "afr-self-heal.h"
#include "byte-order.h"
#define AFR_HEAL_ATTR (GF_SET_ATTR_UID|GF_SET_ATTR_GID|GF_SET_ATTR_MODE)
int
__afr_selfheal_metadata_do (call_frame_t *frame, xlator_t *this, inode_t *inode,
int source, unsigned char *healed_sinks,
struct afr_reply *locked_replies)
{
int ret = -1;
loc_t loc = {0,};
dict_t *xattr = NULL;
dict_t *old_xattr = NULL;
afr_private_t *priv = NULL;
int i = 0;
priv = this->private;
loc.inode = inode_ref (inode);
uuid_copy (loc.gfid, inode->gfid);
gf_log (this->name, GF_LOG_INFO, "performing metadata selfheal on %s",
uuid_utoa (inode->gfid));
ret = syncop_getxattr (priv->children[source], &loc, &xattr, NULL);
if (ret < 0) {
loc_wipe (&loc);
return -EIO;
}
afr_filter_xattrs (xattr);
dict_del (xattr, GF_SELINUX_XATTR_KEY);
for (i = 0; i < priv->child_count; i++) {
if (!healed_sinks[i])
continue;
ret = syncop_setattr (priv->children[i], &loc,
&locked_replies[source].poststat,
AFR_HEAL_ATTR, NULL, NULL);
if (ret)
healed_sinks[i] = 0;
old_xattr = NULL;
ret = syncop_getxattr (priv->children[i], &loc, &old_xattr, 0);
if (old_xattr) {
dict_del (old_xattr, GF_SELINUX_XATTR_KEY);
afr_filter_xattrs (old_xattr);
ret = syncop_removexattr (priv->children[i], &loc, "",
old_xattr);
}
ret = syncop_setxattr (priv->children[i], &loc, xattr, 0);
if (ret)
healed_sinks[i] = 0;
}
loc_wipe (&loc);
if (xattr)
dict_unref (xattr);
return 0;
}
/*
* Look for mismatching uid/gid or mode or user xattrs even if
* AFR xattrs don't say so, and pick one arbitrarily as winner. */
static int
__afr_selfheal_metadata_finalize_source (call_frame_t *frame, xlator_t *this,
unsigned char *sources,
unsigned char *healed_sinks,
unsigned char *locked_on,
struct afr_reply *replies)
{
int i = 0;
afr_private_t *priv = NULL;
struct iatt first = {0, };
int source = -1;
int sources_count = 0;
int ret = 0;
priv = this->private;
sources_count = AFR_COUNT (sources, priv->child_count);
if ((AFR_CMP (locked_on, healed_sinks, priv->child_count) == 0)
|| !sources_count) {
if (!priv->metadata_splitbrain_forced_heal) {
return -EIO;
}
/* Metadata split brain, select one subvol
arbitrarily */
for (i = 0; i < priv->child_count; i++) {
if (locked_on[i] && healed_sinks[i]) {
sources[i] = 1;
healed_sinks[i] = 0;
break;
}
}
}
for (i = 0; i < priv->child_count; i++) {
if (!sources[i])
continue;
if (source == -1) {
source = i;
first = replies[i].poststat;
break;
}
}
for (i = 0; i < priv->child_count; i++) {
if (!sources[i] || i == source)
continue;
if (!IA_EQUAL (first, replies[i].poststat, type) ||
!IA_EQUAL (first, replies[i].poststat, uid) ||
!IA_EQUAL (first, replies[i].poststat, gid) ||
!IA_EQUAL (first, replies[i].poststat, prot)) {
sources[i] = 0;
healed_sinks[i] = 1;
}
}
for (i =0; i < priv->child_count; i++) {
if (!sources[i] || i == source)
continue;
if (replies[source].xdata->count != replies[i].xdata->count) {
sources[i] = 0;
healed_sinks[i] = 1;
continue;
}
ret = dict_foreach(replies[source].xdata, xattr_is_equal,
(void*)replies[i].xdata);
if (ret == -1) {
sources[i] = 0;
healed_sinks[i] = 1;
}
}
return source;
}
static int
__afr_selfheal_metadata_prepare (call_frame_t *frame, xlator_t *this, inode_t *inode,
unsigned char *locked_on, unsigned char *sources,
unsigned char *sinks, unsigned char *healed_sinks,
struct afr_reply *replies)
{
int ret = -1;
int source = -1;
afr_private_t *priv = NULL;
priv = this->private;
ret = afr_selfheal_unlocked_discover (frame, inode, inode->gfid,
replies);
if (ret)
return ret;
ret = afr_selfheal_find_direction (this, replies,
AFR_METADATA_TRANSACTION,
locked_on, sources, sinks);
if (ret)
return ret;
/* Initialize the healed_sinks[] array optimistically to
the intersection of to-be-healed (i.e sinks[]) and
the list of servers which are up (i.e locked_on[]).
As we encounter failures in the healing process, we
will unmark the respective servers in the healed_sinks[]
array.
*/
AFR_INTERSECT (healed_sinks, sinks, locked_on, priv->child_count);
source = __afr_selfheal_metadata_finalize_source (frame, this, sources,
healed_sinks,
locked_on, replies);
if (source < 0)
return -EIO;
return source;
}
static int
__afr_selfheal_metadata (call_frame_t *frame, xlator_t *this, inode_t *inode,
unsigned char *locked_on)
{
afr_private_t *priv = NULL;
int ret = -1;
unsigned char *sources = NULL;
unsigned char *sinks = NULL;
unsigned char *data_lock = NULL;
unsigned char *healed_sinks = NULL;
struct afr_reply *locked_replies = NULL;
int source = -1;
priv = this->private;
sources = alloca0 (priv->child_count);
sinks = alloca0 (priv->child_count);
healed_sinks = alloca0 (priv->child_count);
data_lock = alloca0 (priv->child_count);
locked_replies = alloca0 (sizeof (*locked_replies) * priv->child_count);
ret = afr_selfheal_inodelk (frame, this, inode, this->name,
LLONG_MAX - 1, 0, data_lock);
{
if (ret < AFR_SH_MIN_PARTICIPANTS) {
ret = -ENOTCONN;
goto unlock;
}
ret = __afr_selfheal_metadata_prepare (frame, this, inode,
data_lock, sources,
sinks, healed_sinks,
locked_replies);
if (ret < 0)
goto unlock;
source = ret;
ret = __afr_selfheal_metadata_do (frame, this, inode, source,
healed_sinks, locked_replies);
if (ret)
goto unlock;
ret = afr_selfheal_undo_pending (frame, this, inode, sources,
sinks, healed_sinks,
AFR_METADATA_TRANSACTION,
locked_replies, data_lock);
}
unlock:
afr_selfheal_uninodelk (frame, this, inode, this->name,
LLONG_MAX -1, 0, data_lock);
if (locked_replies)
afr_replies_wipe (locked_replies, priv->child_count);
return ret;
}
int
afr_selfheal_metadata (call_frame_t *frame, xlator_t *this, inode_t *inode)
{
afr_private_t *priv = NULL;
unsigned char *locked_on = NULL;
int ret = 0;
priv = this->private;
locked_on = alloca0 (priv->child_count);
ret = afr_selfheal_tryinodelk (frame, this, inode, priv->sh_domain, 0, 0,
locked_on);
{
if (ret < AFR_SH_MIN_PARTICIPANTS) {
/* Either less than two subvols available, or another
selfheal (from another server) is in progress. Skip
for now in any case there isn't anything to do.
*/
ret = -ENOTCONN;
goto unlock;
}
ret = __afr_selfheal_metadata (frame, this, inode, locked_on);
}
unlock:
afr_selfheal_uninodelk (frame, this, inode, priv->sh_domain, 0, 0, locked_on);
return ret;
}
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