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authorAnand Avati <avati@redhat.com>2014-01-16 16:14:36 -0800
committerVijay Bellur <vbellur@redhat.com>2014-03-22 05:25:57 -0700
commit6d3739292b7b51d2ddbab75b5f884fb38925b943 (patch)
treecf332a881a49c0904a7e023935750c2d080fc1c5 /xlators/cluster/afr/src/afr-self-heal-name.c
parenteb87c96f49b3dd2c7460e58c54ce909c706cd475 (diff)
cluster/afr: refactor
- Remove client side self-healing completely (opendir, openfd, lookup) - Re-work readdir-failover to work reliably in case of NFS - Remove unused/dead lock recovery code - Consistently use xdata in both calls and callbacks in all FOPs - Per-inode event generation, used to force inode ctx refresh - Implement dirty flag support (in place of pending counts) - Eliminate inode ctx structure, use read subvol bits + event_generation - Implement inode ctx refreshing based on event generation - Provide backward compatibility in transactions - remove unused variables and functions - make code more consistent in style and pattern - regularize and clean up inode-write transaction code - regularize and clean up dir-write transaction code - regularize and clean up common FOPs - reorganize transaction framework code - skip setting xattrs in pending dict if nothing is pending - re-write self-healing code using syncops - re-write simpler self-heal-daemon Change-Id: I1e4080c9796c8a2815c2dab4be3073f389d614a8 BUG: 1021686 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/6010 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Diffstat (limited to 'xlators/cluster/afr/src/afr-self-heal-name.c')
-rw-r--r--xlators/cluster/afr/src/afr-self-heal-name.c457
1 files changed, 457 insertions, 0 deletions
diff --git a/xlators/cluster/afr/src/afr-self-heal-name.c b/xlators/cluster/afr/src/afr-self-heal-name.c
new file mode 100644
index 000000000..ce80b8da3
--- /dev/null
+++ b/xlators/cluster/afr/src/afr-self-heal-name.c
@@ -0,0 +1,457 @@
+/*
+ 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"
+
+
+int
+__afr_selfheal_assign_gfid (call_frame_t *frame, xlator_t *this, inode_t *parent,
+ uuid_t pargfid, const char *bname, inode_t *inode,
+ struct afr_reply *replies, int gfid_idx)
+{
+ int i = 0;
+ afr_private_t *priv = NULL;
+ dict_t *xdata = NULL;
+ int ret = 0;
+ loc_t loc = {0, };
+
+ priv = this->private;
+
+ uuid_copy (parent->gfid, pargfid);
+
+ xdata = dict_new ();
+ if (!xdata) {
+ return -ENOMEM;
+ }
+
+ ret = dict_set_static_bin (xdata, "gfid-req",
+ replies[gfid_idx].poststat.ia_gfid, 16);
+ if (ret) {
+ dict_destroy (xdata);
+ return -ENOMEM;
+ }
+
+ loc.parent = inode_ref (parent);
+ loc.inode = inode_ref (inode);
+ uuid_copy (loc.pargfid, pargfid);
+ loc.name = bname;
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (replies[i].op_ret == 0 || replies[i].op_errno != ENODATA)
+ continue;
+
+ ret = syncop_lookup (priv->children[i], &loc, xdata, 0, 0, 0);
+ }
+
+ loc_wipe (&loc);
+ dict_unref (xdata);
+
+ return ret;
+}
+
+
+int
+__afr_selfheal_name_impunge (call_frame_t *frame, xlator_t *this, inode_t *parent,
+ uuid_t pargfid, const char *bname, inode_t *inode,
+ struct afr_reply *replies, int gfid_idx)
+{
+ int i = 0;
+ afr_private_t *priv = NULL;
+ int ret = 0;
+
+ priv = this->private;
+
+ uuid_copy (parent->gfid, pargfid);
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (!replies[i].valid)
+ continue;
+
+ if (uuid_compare (replies[i].poststat.ia_gfid,
+ replies[gfid_idx].poststat.ia_gfid) == 0)
+ continue;
+
+ ret |= afr_selfheal_recreate_entry (frame, this, i, gfid_idx,
+ parent, bname, inode, replies);
+ }
+
+ return ret;
+}
+
+
+int
+__afr_selfheal_name_expunge (call_frame_t *frame, xlator_t *this, inode_t *parent,
+ uuid_t pargfid, const char *bname, inode_t *inode,
+ struct afr_reply *replies)
+{
+ loc_t loc = {0, };
+ int i = 0;
+ afr_private_t *priv = NULL;
+ char g[64];
+ int ret = 0;
+
+ priv = this->private;
+
+ loc.parent = inode_ref (parent);
+ uuid_copy (loc.pargfid, pargfid);
+ loc.name = bname;
+ loc.inode = inode_ref (inode);
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (!replies[i].valid)
+ continue;
+
+ if (replies[i].op_ret)
+ continue;
+
+ switch (replies[i].poststat.ia_type) {
+ case IA_IFDIR:
+ gf_log (this->name, GF_LOG_WARNING,
+ "expunging dir %s/%s (%s) on %s",
+ uuid_utoa (pargfid), bname,
+ uuid_utoa_r (replies[i].poststat.ia_gfid, g),
+ priv->children[i]->name);
+ ret |= syncop_rmdir (priv->children[i], &loc, 1);
+ break;
+ default:
+ gf_log (this->name, GF_LOG_WARNING,
+ "expunging file %s/%s (%s) on %s",
+ uuid_utoa (pargfid), bname,
+ uuid_utoa_r (replies[i].poststat.ia_gfid, g),
+ priv->children[i]->name);
+ ret |= syncop_unlink (priv->children[i], &loc);
+ break;
+ }
+ }
+
+ loc_wipe (&loc);
+
+ return ret;
+
+}
+
+
+int
+__afr_selfheal_name_do (call_frame_t *frame, xlator_t *this, inode_t *parent,
+ uuid_t pargfid, const char *bname, inode_t *inode,
+ unsigned char *sources, unsigned char *sinks,
+ unsigned char *healed_sinks, int source,
+ unsigned char *locked_on, struct afr_reply *replies)
+{
+ int i = 0;
+ afr_private_t *priv = NULL;
+ uuid_t gfid = {0, };
+ int gfid_idx = -1;
+ gf_boolean_t source_is_empty = _gf_true;
+ gf_boolean_t need_heal = _gf_false;
+ int first_idx = -1;
+ char g1[64],g2[64];
+
+ priv = this->private;
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (!replies[i].valid)
+ continue;
+
+ if (first_idx == -1) {
+ first_idx = i;
+ continue;
+ }
+
+ if (replies[i].op_ret != replies[first_idx].op_ret)
+ need_heal = _gf_true;
+
+ if (uuid_compare (replies[i].poststat.ia_gfid,
+ replies[first_idx].poststat.ia_gfid))
+ need_heal = _gf_true;
+ }
+
+ if (!need_heal)
+ return 0;
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (!replies[i].valid)
+ continue;
+
+ if (!replies[i].op_ret && (source == -1 || sources[i])) {
+ source_is_empty = _gf_false;
+ break;
+ }
+ }
+
+ if (source_is_empty) {
+ return __afr_selfheal_name_expunge (frame, this, parent, pargfid,
+ bname, inode, replies);
+ }
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (!replies[i].valid)
+ continue;
+
+ if (uuid_is_null (replies[i].poststat.ia_gfid))
+ continue;
+
+ if (uuid_is_null (gfid)) {
+ uuid_copy (gfid, replies[i].poststat.ia_gfid);
+ gfid_idx = i;
+ continue;
+ }
+
+ if (sources[i] || source == -1) {
+ if (gfid_idx != -1 &&
+ (sources[gfid_idx] || source == -1) &&
+ uuid_compare (gfid, replies[i].poststat.ia_gfid)) {
+ gf_log (this->name, GF_LOG_WARNING,
+ "GFID mismatch for <gfid:%s>/%s "
+ "%s on %s and %s on %s",
+ uuid_utoa (pargfid), bname,
+ uuid_utoa_r (replies[i].poststat.ia_gfid, g1),
+ priv->children[i]->name,
+ uuid_utoa_r (replies[gfid_idx].poststat.ia_gfid, g2),
+ priv->children[gfid_idx]->name);
+ return -1;
+ }
+
+ uuid_copy (gfid, replies[i].poststat.ia_gfid);
+ gfid_idx = i;
+ continue;
+ }
+ }
+
+ if (gfid_idx == -1)
+ return -1;
+
+ __afr_selfheal_assign_gfid (frame, this, parent, pargfid, bname, inode,
+ replies, gfid_idx);
+
+ return __afr_selfheal_name_impunge (frame, this, parent, pargfid,
+ bname, inode, replies, gfid_idx);
+}
+
+
+int
+__afr_selfheal_name_finalize_source (xlator_t *this, unsigned char *sources,
+ unsigned char *sinks, unsigned char *locked_on,
+ struct afr_reply *replies)
+{
+ int i = 0;
+ afr_private_t *priv = NULL;
+ int source = -1;
+ int locked_count = 0;
+ int sources_count = 0;
+ int sinks_count = 0;
+
+ priv = this->private;
+
+ locked_count = AFR_COUNT (locked_on, priv->child_count);
+ sources_count = AFR_COUNT (sources, priv->child_count);
+ sinks_count = AFR_COUNT (sinks, priv->child_count);
+
+ if (locked_count == sinks_count || !sources_count) {
+ return -1;
+ }
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (sources[i]) {
+ source = i;
+ break;
+ }
+ }
+
+ return source;
+}
+
+
+int
+__afr_selfheal_name_prepare (call_frame_t *frame, xlator_t *this, inode_t *parent,
+ uuid_t pargfid, unsigned char *locked_on,
+ unsigned char *sources, unsigned char *sinks,
+ unsigned char *healed_sinks, struct afr_reply *replies,
+ int *source_p)
+{
+ int ret = -1;
+ int source = -1;
+ afr_private_t *priv = NULL;
+ int i = 0;
+
+ priv = this->private;
+
+ ret = afr_selfheal_unlocked_discover (frame, parent, pargfid, replies);
+ if (ret)
+ return ret;
+
+ ret = afr_selfheal_find_direction (frame, this, replies,
+ AFR_ENTRY_TRANSACTION,
+ locked_on, sources, sinks);
+ if (ret)
+ return ret;
+
+ source = __afr_selfheal_name_finalize_source (this, sources, sinks,
+ locked_on, replies);
+ if (source < 0) {
+ /* If source is < 0 (typically split-brain), we perform a
+ conservative merge of entries rather than erroring out */
+ }
+ *source_p = source;
+
+ for (i = 0; i < priv->child_count; i++)
+ /* 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.
+ */
+ healed_sinks[i] = sinks[i] && locked_on[i];
+
+ return ret;
+}
+
+
+int
+afr_selfheal_name_do (call_frame_t *frame, xlator_t *this, inode_t *parent,
+ uuid_t pargfid, const char *bname)
+{
+ afr_private_t *priv = NULL;
+ unsigned char *sources = NULL;
+ unsigned char *sinks = NULL;
+ unsigned char *healed_sinks = NULL;
+ unsigned char *locked_on = NULL;
+ int source = -1;
+ struct afr_reply *replies = NULL;
+ int ret = -1;
+ inode_t *inode = NULL;
+
+ priv = this->private;
+
+ locked_on = alloca0 (priv->child_count);
+ sources = alloca0 (priv->child_count);
+ sinks = alloca0 (priv->child_count);
+ healed_sinks = alloca0 (priv->child_count);
+
+ replies = alloca0 (priv->child_count * sizeof(*replies));
+
+ ret = afr_selfheal_entrylk (frame, this, parent, this->name, bname,
+ locked_on);
+ {
+ if (ret < 2) {
+ ret = -ENOTCONN;
+ goto unlock;
+ }
+
+ ret = __afr_selfheal_name_prepare (frame, this, parent, pargfid,
+ locked_on, sources, sinks,
+ healed_sinks, replies,
+ &source);
+ if (ret)
+ goto unlock;
+
+ inode = afr_selfheal_unlocked_lookup_on (frame, parent, bname,
+ replies, locked_on);
+ if (!inode) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
+ ret = __afr_selfheal_name_do (frame, this, parent, pargfid, bname,
+ inode, sources, sinks, healed_sinks,
+ source, locked_on, replies);
+ }
+unlock:
+ afr_selfheal_unentrylk (frame, this, parent, this->name, bname,
+ locked_on);
+ if (inode)
+ inode_unref (inode);
+
+ return ret;
+}
+
+
+int
+afr_selfheal_name_unlocked_inspect (call_frame_t *frame, xlator_t *this,
+ inode_t *parent, uuid_t pargfid,
+ const char *bname, gf_boolean_t *need_heal)
+{
+ afr_private_t *priv = NULL;
+ int i = 0;
+ struct afr_reply *replies = NULL;
+ inode_t *inode = NULL;
+ int first_idx = -1;
+
+ priv = this->private;
+
+ replies = alloca0 (sizeof (*replies) * priv->child_count);
+
+ inode = afr_selfheal_unlocked_lookup_on (frame, parent, bname,
+ replies, priv->child_up);
+ if (!inode)
+ return -ENOMEM;
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (!replies[i].valid)
+ continue;
+
+ if (first_idx == -1) {
+ first_idx = i;
+ continue;
+ }
+
+ if (replies[i].op_ret != replies[first_idx].op_ret)
+ *need_heal = _gf_true;
+
+ if (uuid_compare (replies[i].poststat.ia_gfid,
+ replies[first_idx].poststat.ia_gfid))
+ *need_heal = _gf_true;
+ }
+
+ if (inode)
+ inode_unref (inode);
+ return 0;
+}
+
+int
+afr_selfheal_name (xlator_t *this, uuid_t pargfid, const char *bname)
+{
+ inode_t *parent = NULL;
+ call_frame_t *frame = NULL;
+ int ret = -1;
+ gf_boolean_t need_heal = _gf_false;
+
+ parent = afr_inode_find (this, pargfid);
+ if (!parent)
+ goto out;
+
+ frame = afr_frame_create (this);
+ if (!frame)
+ goto out;
+
+ ret = afr_selfheal_name_unlocked_inspect (frame, this, parent, pargfid,
+ bname, &need_heal);
+ if (ret)
+ goto out;
+
+ if (need_heal)
+ afr_selfheal_name_do (frame, this, parent, pargfid, bname);
+out:
+ if (parent)
+ inode_unref (parent);
+ if (frame)
+ AFR_STACK_DESTROY (frame);
+
+ return ret;
+}