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-rw-r--r--xlators/lib/src/libxlator.c194
-rw-r--r--xlators/lib/src/libxlator.h112
2 files changed, 224 insertions, 82 deletions
diff --git a/xlators/lib/src/libxlator.c b/xlators/lib/src/libxlator.c
index fe11e35b5..9e5357255 100644
--- a/xlators/lib/src/libxlator.c
+++ b/xlators/lib/src/libxlator.c
@@ -1,25 +1,44 @@
-/*Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
- This file is part of GlusterFS.
-
- GlusterFS is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3 of the License,
- or (at your option) any later version.
-
- GlusterFS is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see
- <http://www.gnu.org/licenses/>.
+/*
+ Copyright (c) 2008-2012 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.
*/
-
#include "mem-types.h"
#include "libxlator.h"
+int marker_xtime_default_gauge[] = {
+ [MCNT_FOUND] = 1,
+ [MCNT_NOTFOUND] = -1,
+ [MCNT_ENODATA] = -1,
+ [MCNT_ENOTCONN] = -1,
+ [MCNT_ENOENT] = -1,
+ [MCNT_EOTHER] = -1,
+};
+
+int marker_uuid_default_gauge[] = {
+ [MCNT_FOUND] = 1,
+ [MCNT_NOTFOUND] = 0,
+ [MCNT_ENODATA] = 0,
+ [MCNT_ENOTCONN] = 0,
+ [MCNT_ENOENT] = 0,
+ [MCNT_EOTHER] = 0,
+};
+
+static int marker_idx_errno_map[] = {
+ [MCNT_FOUND] = EINVAL,
+ [MCNT_NOTFOUND] = EINVAL,
+ [MCNT_ENOENT] = ENOENT,
+ [MCNT_ENOTCONN] = ENOTCONN,
+ [MCNT_ENODATA] = ENODATA,
+ [MCNT_EOTHER] = EINVAL,
+ [MCNT_MAX] = 0,
+};
+
/*Copy the contents of oldtimebuf to newtimbuf*/
static void
update_timebuf (uint32_t *oldtimbuf, uint32_t *newtimebuf)
@@ -56,22 +75,61 @@ match_uuid_local (const char *name, char *uuid)
static void
marker_local_incr_errcount (xl_marker_local_t *local, int op_errno)
{
+ marker_result_idx_t i = -1;
+
if (!local)
return;
switch (op_errno) {
case ENODATA:
- local->enodata_count++;
+ i = MCNT_ENODATA;
break;
case ENOENT:
- local->enoent_count++;
+ i = MCNT_ENOENT;
break;
case ENOTCONN:
- local->enotconn_count++;
+ i = MCNT_ENOTCONN;
break;
default:
+ i = MCNT_EOTHER;
+ break;
+ }
+
+ local->count[i]++;
+}
+
+static int
+evaluate_marker_results (int *gauge, int *count)
+{
+ int i = 0;
+ int op_errno = 0;
+ gf_boolean_t sane = _gf_true;
+
+ /* check if the policy of the gauge is violated;
+ * if yes, try to get the best errno, ie. look
+ * for the first position where there is a more
+ * specific kind of vioilation than the generic EINVAL
+ */
+ for (i = 0; i < MCNT_MAX; i++) {
+ if (sane) {
+ if ((gauge[i] > 0 && count[i] < gauge[i]) ||
+ (gauge[i] < 0 && count[i] >= -gauge[i])) {
+ sane = _gf_false;
+ /* generic action: adopt corresponding errno */
+ op_errno = marker_idx_errno_map[i];
+ }
+ } else {
+ /* already insane; trying to get a more informative
+ * errno by checking subsequent counters
+ */
+ if (count[i] > 0)
+ op_errno = marker_idx_errno_map[i];
+ }
+ if (op_errno && op_errno != EINVAL)
break;
}
+
+ return op_errno;
}
/* Aggregate all the <volid>.xtime attrs of the cluster and send the max*/
@@ -107,14 +165,10 @@ cluster_markerxtime_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
{
callcnt = --local->call_count;
- if (local->esomerr)
- goto unlock;
-
vol_uuid = local->vol_uuid;
if (op_ret) {
marker_local_incr_errcount (local, op_errno);
- local->esomerr = op_errno;
goto unlock;
}
@@ -128,11 +182,11 @@ cluster_markerxtime_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
if (dict_get_ptr (dict, marker_xattr, (void **)&net_timebuf)) {
gf_log (this->name, GF_LOG_WARNING,
"Unable to get <uuid>.xtime attr");
- local->noxtime_count++;
+ local->count[MCNT_NOTFOUND]++;
goto unlock;
}
- if (local->has_xtime) {
+ if (local->count[MCNT_FOUND]) {
get_hosttime (net_timebuf, host_timebuf);
if ( (host_timebuf[0]>local->host_timebuf[0]) ||
(host_timebuf[0] == local->host_timebuf[0] &&
@@ -144,7 +198,7 @@ cluster_markerxtime_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
} else {
get_hosttime (net_timebuf, local->host_timebuf);
update_timebuf (net_timebuf, local->net_timebuf);
- local->has_xtime = _gf_true;
+ local->count[MCNT_FOUND]++;
}
}
@@ -156,7 +210,7 @@ unlock:
op_errno = 0;
need_unwind = 1;
- if (local->has_xtime) {
+ if (local->count[MCNT_FOUND]) {
if (!dict)
dict = dict_new();
@@ -169,17 +223,9 @@ unlock:
}
}
- if (local->noxtime_count)
- goto out;
-
- if (local->enodata_count || local->enotconn_count ||
- local->enoent_count) {
+ op_errno = evaluate_marker_results (local->gauge, local->count);
+ if (op_errno)
op_ret = -1;
- op_errno = local->enodata_count? ENODATA:
- local->enotconn_count? ENOTCONN:
- local->enoent_count? ENOENT:
- local->esomerr;
- }
}
out:
@@ -187,12 +233,12 @@ out:
frame->local = local->xl_local;
local->xl_specf_unwind (frame, op_ret,
op_errno, dict, xdata);
- return 0;
} else if (need_unwind) {
STACK_UNWIND_STRICT (getxattr, frame, op_ret, op_errno,
dict, xdata);
}
+ GF_FREE (marker_xattr);
return 0;
}
@@ -237,7 +283,7 @@ cluster_markeruuid_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
if (ret)
goto unlock;
- if (marker_has_volinfo (local)) {
+ if (local->count[MCNT_FOUND]) {
if ((local->volmark->major != volmark->major) ||
(local->volmark->minor != volmark->minor)) {
op_ret = -1;
@@ -266,6 +312,7 @@ cluster_markeruuid_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
uuid_unparse (volmark->uuid, vol_uuid);
if (volmark->retval)
local->retval = volmark->retval;
+ local->count[MCNT_FOUND]++;
}
}
unlock:
@@ -276,7 +323,7 @@ unlock:
op_errno = 0;
need_unwind = 1;
- if (marker_has_volinfo (local)) {
+ if (local->count[MCNT_FOUND]) {
if (!dict)
dict = dict_new();
@@ -286,11 +333,10 @@ unlock:
op_ret = -1;
op_errno = ENOMEM;
}
- } else {
- op_ret = -1;
- op_errno = local->enotconn_count? ENOTCONN:
- local->enoent_count? ENOENT:EINVAL;
}
+ op_errno = evaluate_marker_results (local->gauge, local->count);
+ if (op_errno)
+ op_ret = -1;
}
out:
@@ -312,7 +358,7 @@ cluster_getmarkerattr (call_frame_t *frame,xlator_t *this, loc_t *loc,
const char *name, void *xl_local,
xlator_specf_unwind_t xl_specf_getxattr_unwind,
xlator_t **sub_volumes, int count, int type,
- char *vol_uuid)
+ int *gauge, char *vol_uuid)
{
int i = 0;
xl_marker_local_t *local = NULL;
@@ -335,6 +381,7 @@ cluster_getmarkerattr (call_frame_t *frame,xlator_t *this, loc_t *loc,
local->call_count = count;
local->xl_specf_unwind = xl_specf_getxattr_unwind;
local->vol_uuid = vol_uuid;
+ memcpy (local->gauge, gauge, sizeof (local->gauge));
frame->local = local;
@@ -366,3 +413,58 @@ err:
return -1;
}
+
+int
+gf_get_min_stime (xlator_t *this, dict_t *dst, char *key, data_t *value)
+{
+ int ret = -1;
+ uint32_t *net_timebuf = NULL;
+ uint32_t *value_timebuf = NULL;
+ uint32_t host_timebuf[2] = {0,};
+ uint32_t host_value_timebuf[2] = {0,};
+
+ /* stime should be minimum of all the other nodes */
+ ret = dict_get_bin (dst, key, (void **)&net_timebuf);
+ if (ret < 0) {
+ net_timebuf = GF_CALLOC (1, sizeof (int64_t),
+ gf_common_mt_char);
+ if (!net_timebuf)
+ goto out;
+
+ ret = dict_set_bin (dst, key, net_timebuf, sizeof (int64_t));
+ if (ret < 0) {
+ gf_log (this->name, GF_LOG_WARNING,
+ "key=%s: dict set failed", key);
+ goto error;
+ }
+ }
+
+ value_timebuf = data_to_bin (value);
+ if (!value_timebuf) {
+ gf_log (this->name, GF_LOG_WARNING,
+ "key=%s: getting value of stime failed", key);
+ ret = -1;
+ goto out;
+ }
+
+ get_hosttime (value_timebuf, host_value_timebuf);
+ get_hosttime (net_timebuf, host_timebuf);
+
+ /* can't use 'min()' macro here as we need to compare two fields
+ in the array, selectively */
+ if ((host_value_timebuf[0] > host_timebuf[0]) ||
+ ((host_value_timebuf[0] == host_timebuf[0]) &&
+ (host_value_timebuf[1] > host_timebuf[1]))) {
+ update_timebuf (value_timebuf, net_timebuf);
+ }
+
+ ret = 0;
+out:
+ return ret;
+error:
+ /* To be used only when net_timebuf is not set in the dict */
+ if (net_timebuf)
+ GF_FREE (net_timebuf);
+
+ return ret;
+}
diff --git a/xlators/lib/src/libxlator.h b/xlators/lib/src/libxlator.h
index 560e388c7..1d5e1657f 100644
--- a/xlators/lib/src/libxlator.h
+++ b/xlators/lib/src/libxlator.h
@@ -1,21 +1,12 @@
-/*Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
- This file is part of GlusterFS.
-
- GlusterFS is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3 of the License,
- or (at your option) any later version.
-
- GlusterFS is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see
- <http://www.gnu.org/licenses/>.
+/*
+ Copyright (c) 2008-2012 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 _LIBXLATOR_H
#define _LIBXLATOR_H
@@ -57,6 +48,69 @@ struct volume_mark {
uint32_t usec;
}__attribute__ ((__packed__));
+
+/*
+ * The enumerated type here
+ * is used to index two kind
+ * of integer arrays:
+ * - gauges
+ * - counters
+
+ * A counter is used internally,
+ * in getxattr callbacks, to count
+ * the results, categorized as
+ * the enum names suggest. So values
+ * in the counter are always non-negative.
+
+ * Gauges are part of the API.
+ * The caller passes one to the
+ * top-level aggregator function,
+ * cluster_getmarkerattr(). The gauge
+ * defines an evaluation policy for the
+ * counter. That is, at the
+ * end of the aggregation process
+ * the gauge is matched against the
+ * counter, and the policy
+ * represented by the gauge decides
+ * whether to return with success or failure,
+ * and in latter case, what particular failure
+ * case (errno).
+
+ * The rules are the following: for some index i,
+ * - if gauge[i] == 0, no requirement is set
+ * against counter[i];
+ * - if gauge[i] > 0, counter[i] >= gauge[i]
+ * is required;
+ * - if gauge[i] < 0, counter[i] < |gauge[i]|
+ * is required.
+
+ * If the requirement is not met, then i is mapped
+ * to the respective errno (MCNT_ENOENT -> ENOENT),
+ * or in lack of that, EINVAL.
+
+ * Cf. evaluate_marker_results() and marker_idx_errno_map[]
+ * in libxlator.c
+
+ * We provide two default gauges, one inteded for xtime
+ * aggregation, other for volume mark aggregation. The
+ * policies they represent agree with the hard-coded
+ * one prior to gauges. Cf. marker_xtime_default_gauge
+ * and marker_uuid_default_gauge in libxlator.c
+ */
+
+typedef enum {
+ MCNT_FOUND,
+ MCNT_NOTFOUND,
+ MCNT_ENODATA,
+ MCNT_ENOTCONN,
+ MCNT_ENOENT,
+ MCNT_EOTHER,
+ MCNT_MAX
+} marker_result_idx_t;
+
+extern int marker_xtime_default_gauge[];
+extern int marker_uuid_default_gauge[];
+
struct marker_str {
struct volume_mark *volmark;
data_t *data;
@@ -64,13 +118,8 @@ struct marker_str {
uint32_t host_timebuf[2];
uint32_t net_timebuf[2];
int32_t call_count;
- unsigned has_xtime:1;
- int32_t enoent_count;
- int32_t enotconn_count;
- int32_t enodata_count;
- int32_t noxtime_count;
-
- int esomerr;
+ int gauge[MCNT_MAX];
+ int count[MCNT_MAX];
xlator_specf_unwind_t xl_specf_unwind;
void *xl_local;
@@ -80,15 +129,6 @@ struct marker_str {
typedef struct marker_str xl_marker_local_t;
-static inline gf_boolean_t
-marker_has_volinfo (xl_marker_local_t *marker)
-{
- if (marker->volmark)
- return _gf_true;
- else
- return _gf_false;
-}
-
int32_t
cluster_markerxtime_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int op_ret, int op_errno, dict_t *dict, dict_t *xdata);
@@ -102,12 +142,12 @@ cluster_getmarkerattr (call_frame_t *frame,xlator_t *this, loc_t *loc,
const char *name, void *xl_local,
xlator_specf_unwind_t xl_specf_getxattr_unwind,
xlator_t **sub_volumes, int count, int type,
- char *vol_uuid);
+ int *gauge, char *vol_uuid);
int
match_uuid_local (const char *name, char *uuid);
-
-
+int
+gf_get_min_stime (xlator_t *this, dict_t *dst, char *key, data_t *value);
#endif /* !_LIBXLATOR_H */
generated by cgit (git 2.34.1) at 2026-01-11 22:17:37 +0000