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authorPranith Kumar K <pkarampu@redhat.com>2014-04-29 05:49:21 +0530
committerPranith Kumar Karampuri <pkarampu@redhat.com>2014-05-14 17:29:21 -0700
commiteb04dab9992f8f5d4b2d45e1ca10032fededcff1 (patch)
tree2af635b749291849c92f37ec0dc96d8e0136aa36 /xlators/cluster/afr
parenta9df8ccbd331e21bcbccf3abc65abe730d6f0489 (diff)
cluster/afr: Fix bugs in quorum implementation
- Have common place to perform quorum fop wind check - Check if fop succeeded in a way that matches quorum to avoid marking changelog in split-brain. BUG: 1066996 Change-Id: Ibc5b80e01dc206b2abbea2d29e26f3c60ff4f204 Signed-off-by: Pranith Kumar K <pkarampu@redhat.com> Reviewed-on: http://review.gluster.org/7600 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Ravishankar N <ravishankar@redhat.com>
Diffstat (limited to 'xlators/cluster/afr')
-rw-r--r--xlators/cluster/afr/src/afr-common.c14
-rw-r--r--xlators/cluster/afr/src/afr-dir-write.c16
-rw-r--r--xlators/cluster/afr/src/afr-inode-write.c62
-rw-r--r--xlators/cluster/afr/src/afr-open.c4
-rw-r--r--xlators/cluster/afr/src/afr-transaction.c144
-rw-r--r--xlators/cluster/afr/src/afr-transaction.h1
-rw-r--r--xlators/cluster/afr/src/afr.c9
-rw-r--r--xlators/cluster/afr/src/afr.h16
8 files changed, 164 insertions, 102 deletions
diff --git a/xlators/cluster/afr/src/afr-common.c b/xlators/cluster/afr/src/afr-common.c
index 164a651bad5..4c7692bd671 100644
--- a/xlators/cluster/afr/src/afr-common.c
+++ b/xlators/cluster/afr/src/afr-common.c
@@ -3144,6 +3144,8 @@ afr_notify (xlator_t *this, int32_t event,
int up_child = -1;
dict_t *input = NULL;
dict_t *output = NULL;
+ gf_boolean_t had_quorum = _gf_false;
+ gf_boolean_t has_quorum = _gf_false;
priv = this->private;
@@ -3181,6 +3183,8 @@ afr_notify (xlator_t *this, int32_t event,
goto out;
}
+ had_quorum = priv->quorum_count && afr_has_quorum (priv->child_up,
+ this);
switch (event) {
case GF_EVENT_CHILD_UP:
LOCK (&priv->lock);
@@ -3279,6 +3283,16 @@ afr_notify (xlator_t *this, int32_t event,
break;
}
+ if (priv->quorum_count) {
+ has_quorum = afr_has_quorum (priv->child_up, this);
+ if (!had_quorum && has_quorum)
+ gf_log (this->name, GF_LOG_INFO, "Client-quorum"
+ " is met");
+ if (had_quorum && !has_quorum)
+ gf_log (this->name, GF_LOG_WARNING,
+ "Client-quorum is not met");
+ }
+
/* have all subvolumes reported status once by now? */
have_heard_from_all = 1;
for (i = 0; i < priv->child_count; i++) {
diff --git a/xlators/cluster/afr/src/afr-dir-write.c b/xlators/cluster/afr/src/afr-dir-write.c
index 465dde54f9c..d59536fcb48 100644
--- a/xlators/cluster/afr/src/afr-dir-write.c
+++ b/xlators/cluster/afr/src/afr-dir-write.c
@@ -447,8 +447,6 @@ afr_create (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
priv = this->private;
- QUORUM_CHECK(create,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -585,8 +583,6 @@ afr_mknod (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
priv = this->private;
- QUORUM_CHECK(mknod,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -718,8 +714,6 @@ afr_mkdir (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
priv = this->private;
- QUORUM_CHECK(mkdir,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -849,8 +843,6 @@ afr_link (call_frame_t *frame, xlator_t *this, loc_t *oldloc, loc_t *newloc,
priv = this->private;
- QUORUM_CHECK(link,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -981,8 +973,6 @@ afr_symlink (call_frame_t *frame, xlator_t *this, const char *linkpath,
priv = this->private;
- QUORUM_CHECK(symlink,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -1116,8 +1106,6 @@ afr_rename (call_frame_t *frame, xlator_t *this, loc_t *oldloc, loc_t *newloc,
priv = this->private;
- QUORUM_CHECK(rename,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
op_errno = ENOMEM;
@@ -1271,8 +1259,6 @@ afr_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int xflag,
priv = this->private;
- QUORUM_CHECK(unlink,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -1400,8 +1386,6 @@ afr_rmdir (call_frame_t *frame, xlator_t *this, loc_t *loc, int flags,
priv = this->private;
- QUORUM_CHECK(rmdir,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
diff --git a/xlators/cluster/afr/src/afr-inode-write.c b/xlators/cluster/afr/src/afr-inode-write.c
index 00e0d26768b..0c3ba920937 100644
--- a/xlators/cluster/afr/src/afr-inode-write.c
+++ b/xlators/cluster/afr/src/afr-inode-write.c
@@ -229,7 +229,7 @@ afr_writev_handle_short_writes (call_frame_t *frame, xlator_t *this)
continue;
if (local->replies[i].op_ret < local->op_ret)
- afr_transaction_fop_failed(frame, this, i);
+ afr_transaction_fop_failed (frame, this, i);
}
}
@@ -402,14 +402,9 @@ afr_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
struct iovec *vector, int32_t count, off_t offset,
uint32_t flags, struct iobref *iobref, dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
int op_errno = ENOMEM;
- priv = this->private;
-
- QUORUM_CHECK(writev,out);
-
local = AFR_FRAME_INIT (frame, op_errno);
if (!local)
goto out;
@@ -528,16 +523,11 @@ int
afr_truncate (call_frame_t *frame, xlator_t *this,
loc_t *loc, off_t offset, dict_t *xdata)
{
- afr_private_t * priv = NULL;
afr_local_t * local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
int op_errno = ENOMEM;
- priv = this->private;
-
- QUORUM_CHECK(truncate,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -652,16 +642,11 @@ int
afr_ftruncate (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
int op_errno = ENOMEM;
- priv = this->private;
-
- QUORUM_CHECK(ftruncate,out);
-
transaction_frame = copy_frame (frame);
if (!frame)
goto out;
@@ -769,16 +754,11 @@ int
afr_setattr (call_frame_t *frame, xlator_t *this, loc_t *loc, struct iatt *buf,
int32_t valid, dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
int op_errno = ENOMEM;
- priv = this->private;
-
- QUORUM_CHECK(setattr,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -879,16 +859,11 @@ int
afr_fsetattr (call_frame_t *frame, xlator_t *this,
fd_t *fd, struct iatt *buf, int32_t valid, dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
int op_errno = ENOMEM;
- priv = this->private;
-
- QUORUM_CHECK(fsetattr,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -991,7 +966,6 @@ int
afr_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *dict,
int32_t flags, dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
@@ -1003,10 +977,6 @@ afr_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *dict,
GF_IF_INTERNAL_XATTR_GOTO ("trusted.glusterfs.afr.*", dict,
op_errno, out);
- priv = this->private;
-
- QUORUM_CHECK(setxattr,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -1107,7 +1077,6 @@ int
afr_fsetxattr (call_frame_t *frame, xlator_t *this,
fd_t *fd, dict_t *dict, int32_t flags, dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
@@ -1119,10 +1088,6 @@ afr_fsetxattr (call_frame_t *frame, xlator_t *this,
GF_IF_INTERNAL_XATTR_GOTO ("trusted.glusterfs.afr.*", dict,
op_errno, out);
- priv = this->private;
-
- QUORUM_CHECK(fsetxattr,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -1226,7 +1191,6 @@ int
afr_removexattr (call_frame_t *frame, xlator_t *this,
loc_t *loc, const char *name, dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
@@ -1238,10 +1202,6 @@ afr_removexattr (call_frame_t *frame, xlator_t *this,
GF_IF_NATIVE_XATTR_GOTO ("trusted.glusterfs.afr.*",
name, op_errno, out);
- priv = this->private;
-
- QUORUM_CHECK(removexattr,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -1339,7 +1299,6 @@ int
afr_fremovexattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
const char *name, dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
@@ -1351,10 +1310,6 @@ afr_fremovexattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
GF_IF_NATIVE_XATTR_GOTO ("trusted.glusterfs.afr.*",
name, op_errno, out);
- priv = this->private;
-
- QUORUM_CHECK(fremovexattr, out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -1455,16 +1410,11 @@ int
afr_fallocate (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
off_t offset, size_t len, dict_t *xdata)
{
- afr_private_t *priv = NULL;
call_frame_t *transaction_frame = NULL;
afr_local_t *local = NULL;
int ret = -1;
int op_errno = ENOMEM;
- priv = this->private;
-
- QUORUM_CHECK(fallocate,out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -1573,16 +1523,11 @@ int
afr_discard (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
size_t len, dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
int op_errno = ENOMEM;
- priv = this->private;
-
- QUORUM_CHECK(discard, out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
@@ -1687,16 +1632,11 @@ int
afr_zerofill (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
size_t len, dict_t *xdata)
{
- afr_private_t *priv = NULL;
afr_local_t *local = NULL;
call_frame_t *transaction_frame = NULL;
int ret = -1;
int op_errno = ENOMEM;
- priv = this->private;
-
- QUORUM_CHECK(discard, out);
-
transaction_frame = copy_frame (frame);
if (!transaction_frame)
goto out;
diff --git a/xlators/cluster/afr/src/afr-open.c b/xlators/cluster/afr/src/afr-open.c
index f86aa7fd80d..83da86053f4 100644
--- a/xlators/cluster/afr/src/afr-open.c
+++ b/xlators/cluster/afr/src/afr-open.c
@@ -131,10 +131,6 @@ afr_open (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
priv = this->private;
- if (flags & (O_CREAT|O_TRUNC)) {
- QUORUM_CHECK(open,out);
- }
-
local = AFR_FRAME_INIT (frame, op_errno);
if (!local)
goto out;
diff --git a/xlators/cluster/afr/src/afr-transaction.c b/xlators/cluster/afr/src/afr-transaction.c
index 205ff759ef5..270e2212913 100644
--- a/xlators/cluster/afr/src/afr-transaction.c
+++ b/xlators/cluster/afr/src/afr-transaction.c
@@ -430,6 +430,135 @@ afr_handle_symmetric_errors (call_frame_t *frame, xlator_t *this)
__mark_all_success (frame, this);
}
+gf_boolean_t
+afr_has_quorum (unsigned char *subvols, xlator_t *this)
+{
+ unsigned int quorum_count = 0;
+ afr_private_t *priv = NULL;
+ unsigned int up_children_count = 0;
+
+ priv = this->private;
+ up_children_count = AFR_COUNT (subvols, priv->child_count);
+
+ if (priv->quorum_count == AFR_QUORUM_AUTO) {
+ /*
+ * Special case for even numbers of nodes in auto-quorum:
+ * if we have exactly half children up
+ * and that includes the first ("senior-most") node, then that counts
+ * as quorum even if it wouldn't otherwise. This supports e.g. N=2
+ * while preserving the critical property that there can only be one
+ * such group.
+ */
+ if ((priv->child_count % 2 == 0) &&
+ (up_children_count == (priv->child_count/2)))
+ return subvols[0];
+ }
+
+ if (priv->quorum_count == AFR_QUORUM_AUTO) {
+ quorum_count = priv->child_count/2 + 1;
+ } else {
+ quorum_count = priv->quorum_count;
+ }
+
+ if (up_children_count >= quorum_count)
+ return _gf_true;
+
+ return _gf_false;
+}
+
+static gf_boolean_t
+afr_has_fop_quorum (call_frame_t *frame)
+{
+ xlator_t *this = frame->this;
+ afr_local_t *local = frame->local;
+ unsigned char *locked_nodes = NULL;
+
+ locked_nodes = afr_locked_nodes_get (local->transaction.type,
+ &local->internal_lock);
+ return afr_has_quorum (locked_nodes, this);
+}
+
+static gf_boolean_t
+afr_has_fop_cbk_quorum (call_frame_t *frame)
+{
+ afr_local_t *local = frame->local;
+ xlator_t *this = frame->this;
+ afr_private_t *priv = this->private;
+ unsigned char *success = alloca0(priv->child_count);
+ int i = 0;
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (local->transaction.pre_op[i])
+ if (!local->transaction.failed_subvols[i])
+ success[i] = 1;
+ }
+
+ return afr_has_quorum (success, this);
+}
+
+void
+afr_handle_quorum (call_frame_t *frame)
+{
+ afr_local_t *local = NULL;
+ afr_private_t *priv = NULL;
+ int i = 0;
+ const char *file = NULL;
+ uuid_t gfid = {0};
+
+ local = frame->local;
+ priv = frame->this->private;
+
+ if (priv->quorum_count == 0)
+ return;
+
+ /*
+ * Network split may happen just after the fops are unwound, so check
+ * if the fop succeeded in a way it still follows quorum. If it doesn't,
+ * mark the fop as failure, mark the changelogs so it reflects that
+ * failure.
+ *
+ * Scenario:
+ * There are 3 mounts on 3 machines(node1, node2, node3) all writing to
+ * single file. Network split happened in a way that node1 can't see
+ * node2, node3. Node2, node3 both of them can't see node1. Now at the
+ * time of sending write all the bricks are up. Just after write fop is
+ * wound on node1, network split happens. Node1 thinks write fop failed
+ * on node2, node3 so marks pending changelog for those 2 extended
+ * attributes on node1. Node2, node3 thinks writes failed on node1 so
+ * they mark pending changelog for node1. When the network is stable
+ * again the file already is in split-brain. These checks prevent
+ * marking pending changelog on other subvolumes if the fop doesn't
+ * succeed in a way it is still following quorum. So with this fix what
+ * is happening is, node1 will have all pending changelog(FOOL) because
+ * the write succeeded only on node1 but failed on node2, node3 so
+ * instead of marking pending changelogs on node2, node3 it just treats
+ * the fop as failure and goes into DIRTY state. Where as node2, node3
+ * say they are sources and have pending changelog to node1 so there is
+ * no split-brain with the fix. The problem is eliminated completely.
+ */
+
+ if (afr_has_fop_cbk_quorum (frame))
+ return;
+
+ if (local->fd) {
+ uuid_copy (gfid, local->fd->inode->gfid);
+ file = uuid_utoa (gfid);
+ } else {
+ loc_path (&local->loc, local->loc.name);
+ file = local->loc.path;
+ }
+
+ gf_log (frame->this->name, GF_LOG_WARNING, "%s: Failing %s as quorum "
+ "is not met", file, gf_fop_list[local->op]);
+
+ for (i = 0; i < priv->child_count; i++) {
+ if (local->transaction.pre_op[i])
+ afr_transaction_fop_failed (frame, frame->this, i);
+ }
+
+ local->op_ret = -1;
+ local->op_errno = EROFS;
+}
int
afr_changelog_post_op_now (call_frame_t *frame, xlator_t *this)
@@ -443,6 +572,7 @@ afr_changelog_post_op_now (call_frame_t *frame, xlator_t *this)
int nothing_failed = 1;
gf_boolean_t need_undirty = _gf_false;
+ afr_handle_quorum (frame);
local = frame->local;
idx = afr_index_for_transaction_type (local->transaction.type);
@@ -453,6 +583,14 @@ afr_changelog_post_op_now (call_frame_t *frame, xlator_t *this)
else
need_undirty = _gf_true;
+ //If the fop fails on all the subvols then pending markers are placed
+ //for every subvol on all subvolumes. Which is nothing but split-brain.
+ //Avoid this by not doing post-op in case of failures.
+ if (local->op_ret < 0) {
+ afr_changelog_post_op_done (frame, this);
+ goto out;
+ }
+
if (nothing_failed && !need_undirty) {
afr_changelog_post_op_done (frame, this);
goto out;
@@ -842,7 +980,10 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
}
}
- /* TBD: quorum check w/ call_count */
+ if (priv->quorum_count && !afr_has_fop_quorum (frame)) {
+ op_errno = EROFS;
+ goto err;
+ }
if (call_count == 0) {
op_errno = ENOTCONN;
@@ -1057,7 +1198,6 @@ afr_post_blocking_rename_cbk (call_frame_t *frame, xlator_t *this)
return 0;
}
-
int
afr_post_lower_unlock_cbk (call_frame_t *frame, xlator_t *this)
{
diff --git a/xlators/cluster/afr/src/afr-transaction.h b/xlators/cluster/afr/src/afr-transaction.h
index 77cc8eed019..c3ce333b771 100644
--- a/xlators/cluster/afr/src/afr-transaction.h
+++ b/xlators/cluster/afr/src/afr-transaction.h
@@ -49,5 +49,6 @@ int afr_read_txn_continue (call_frame_t *frame, xlator_t *this, int subvol);
int __afr_txn_write_fop (call_frame_t *frame, xlator_t *this);
int __afr_txn_write_done (call_frame_t *frame, xlator_t *this);
call_frame_t *afr_transaction_detach_fop_frame (call_frame_t *frame);
+gf_boolean_t afr_has_quorum (unsigned char *subvols, xlator_t *this);
#endif /* __TRANSACTION_H__ */
diff --git a/xlators/cluster/afr/src/afr.c b/xlators/cluster/afr/src/afr.c
index ead08425f2c..6af136e9163 100644
--- a/xlators/cluster/afr/src/afr.c
+++ b/xlators/cluster/afr/src/afr.c
@@ -180,6 +180,9 @@ reconfigure (xlator_t *this, dict_t *options)
GF_OPTION_RECONF ("quorum-count", priv->quorum_count, options,
uint32, out);
fix_quorum_options(this,priv,qtype);
+ if (priv->quorum_count && !afr_has_quorum (priv->child_up, this))
+ gf_log (this->name, GF_LOG_WARNING, "Client-quorum is not met");
+
GF_OPTION_RECONF ("post-op-delay-secs", priv->post_op_delay_secs, options,
uint32, out);
@@ -456,9 +459,6 @@ struct xlator_fops fops = {
.finodelk = afr_finodelk,
.entrylk = afr_entrylk,
.fentrylk = afr_fentrylk,
- .fallocate = afr_fallocate,
- .discard = afr_discard,
- .zerofill = afr_zerofill,
/* inode read */
.access = afr_access,
@@ -479,6 +479,9 @@ struct xlator_fops fops = {
.fsetattr = afr_fsetattr,
.removexattr = afr_removexattr,
.fremovexattr = afr_fremovexattr,
+ .fallocate = afr_fallocate,
+ .discard = afr_discard,
+ .zerofill = afr_zerofill,
/* dir read */
.opendir = afr_opendir,
diff --git a/xlators/cluster/afr/src/afr.h b/xlators/cluster/afr/src/afr.h
index 36042f7b2e5..674ea0bf72e 100644
--- a/xlators/cluster/afr/src/afr.h
+++ b/xlators/cluster/afr/src/afr.h
@@ -922,9 +922,6 @@ int
afr_child_fd_ctx_set (xlator_t *this, fd_t *fd, int32_t child,
int flags);
-gf_boolean_t
-afr_have_quorum (char *logname, afr_private_t *priv);
-
void
afr_matrix_cleanup (int32_t **pending, unsigned int m);
@@ -940,19 +937,6 @@ afr_filter_xattrs (dict_t *xattr);
*/
#define AFR_QUORUM_AUTO INT_MAX
-/*
- * Having this as a macro will make debugging a bit weirder, but does reduce
- * the probability of functions handling this check inconsistently.
- */
-#define QUORUM_CHECK(_func,_label) do { \
- if (priv->quorum_count && !afr_have_quorum(this->name,priv)) { \
- gf_log(this->name,GF_LOG_WARNING, \
- "failing "#_func" due to lack of quorum"); \
- op_errno = EROFS; \
- goto _label; \
- } \
-} while (0);
-
int
afr_fd_report_unstable_write (xlator_t *this, fd_t *fd);