adding libxlator, to ensure proper client side aggregation of marks by clustering translators

Signed-off-by: Kaushik BV <kaushikbv@gluster.com>
Signed-off-by: Csaba Henk <csaba@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 2310 (georeplication)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2310

2 files changed, 457 insertions, 0 deletions

diff --git a/xlators/lib/src/libxlator.c b/xlators/lib/src/libxlator.c
new file mode 100644
index 000000000..7708f86e6
--- /dev/null
+++ b/xlators/lib/src/libxlator.c
@@ -0,0 +1,371 @@
+#include "mem-types.h"
+#include "libxlator.h"
+
+
+/*Copy the contents of oldtimebuf to newtimbuf*/
+static void
+update_timebuf (uint32_t *oldtimbuf, uint32_t *newtimebuf)
+{
+        newtimebuf[0] =  (oldtimbuf[0]);
+        newtimebuf[1] =  (oldtimbuf[1]);
+}
+
+/* Convert Timebuf in network order to host order */
+static void
+get_hosttime (uint32_t *oldtimbuf, uint32_t *newtimebuf)
+{
+        newtimebuf[0] = ntohl (oldtimbuf[0]);
+        newtimebuf[1] = ntohl (oldtimbuf[1]);
+}
+
+
+
+/* Match the Incoming trusted.glusterfs.<uuid>.xtime against volume uuid */
+int
+match_uuid_local (const char *name, char *uuid)
+{
+        name = strtail ((char *)name, MARKER_XATTR_PREFIX);
+        if (!name || name++[0] != '.')
+                return -1;
+
+        name = strtail ((char *)name, uuid);
+        if (!name || strcmp (name, ".xtime") != 0)
+                return -1;
+
+        return 0;
+}
+
+
+
+
+/* Aggregate all the <volid>.xtime attrs of the cluster and send the max*/
+int32_t
+cluster_markerxtime_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                        int op_ret, int op_errno, dict_t *dict)
+
+{
+
+        int32_t            callcnt = 0;
+        int                ret = -1;
+        uint32_t          *net_timebuf;
+        uint32_t           host_timebuf[2];
+        char              *marker_xattr;
+        struct marker_str *local;
+        char              *vol_uuid;
+
+        if (!this || !frame || !frame->local || !cookie) {
+                gf_log (this->name, GF_LOG_DEBUG, "possible NULL deref");
+                goto out;
+        }
+
+        local = frame->local;
+        if (!local || !local->vol_uuid) {
+                gf_log (this->name, GF_LOG_DEBUG, "possible NULL deref");
+                goto out;
+        }
+
+        vol_uuid = local->vol_uuid;
+
+        if (op_ret && op_errno == ENOENT) {
+                LOCK (&frame->lock);
+                {
+                        callcnt = --local->call_count;
+                        local->enoent_count++;
+                }
+                goto done;
+        }
+
+        if (op_ret && op_errno == ENOTCONN) {
+                LOCK (&frame->lock);
+                {
+                        callcnt = --local->call_count;
+                        local->enotconn_count++;
+                }
+                goto done;
+        }
+
+
+        LOCK (&frame->lock);
+        {
+                callcnt = --local->call_count;
+                if (!gf_asprintf (& marker_xattr, "%s.%s.%s",
+                                MARKER_XATTR_PREFIX, vol_uuid, XTIME)) {
+                        op_errno = ENOMEM;
+                        goto out;
+                }
+
+
+                if (dict_get_ptr (dict, marker_xattr, (void **)&net_timebuf)) {
+                        gf_log (this->name, GF_LOG_WARNING,
+                                "Unable to get <uuid>.xtime attr");
+
+                        goto done;
+                }
+
+                if (local->has_xtime) {
+
+                        get_hosttime (net_timebuf, host_timebuf);
+                        if ( (host_timebuf[0]>local->host_timebuf[0]) ||
+                                (host_timebuf[0] == local->host_timebuf[0] &&
+                                 host_timebuf[1] >= local->host_timebuf[1])) {
+
+                                update_timebuf (net_timebuf, local->net_timebuf);
+                                update_timebuf (host_timebuf, local->host_timebuf);
+
+                        }
+
+                }
+                else {
+                        get_hosttime (net_timebuf, local->host_timebuf);
+                        update_timebuf (net_timebuf, local->net_timebuf);
+                        local->has_xtime = _gf_true;
+                }
+
+
+
+        }
+done:
+        UNLOCK (&frame->lock);
+
+        if (!callcnt) {
+
+                op_ret = 0;
+                op_errno = 0;
+                if (local->has_xtime) {
+                        if (!dict) {
+                                dict = dict_new();
+                                if (ret) {
+                                        op_ret = -1;
+                                        op_errno = ENOMEM;
+                                        goto out;
+                                }
+                        }
+                        ret = dict_set_static_bin (dict, marker_xattr,
+                                           (void *)local->net_timebuf, 8);
+                        if (ret) {
+                                op_ret = -1;
+                                op_errno = ENOMEM;
+                                goto out;
+                        }
+                }
+                else {
+                        op_ret = -1;
+                        if (local->enotconn_count) {
+                                op_errno = ENOTCONN;
+                                goto out;
+                        }
+                        if (local->enoent_count) {
+                                op_errno = ENOENT;
+                                goto out;
+                        }
+                        else {
+                                op_errno = EINVAL;
+                                goto out;
+                        }
+                }
+out:
+                if (local->xl_specf_unwind) {
+                        frame->local = local->xl_local;
+                        local->xl_specf_unwind (getxattr, frame, op_ret,
+                                                 op_errno, dict);
+                        return 0;
+                }
+                STACK_UNWIND_STRICT (getxattr, frame, op_ret, op_errno, dict);
+
+        }
+
+        return 0;
+
+}
+
+int32_t
+cluster_markeruuid_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                        int op_ret, int op_errno, dict_t *dict)
+{
+        int32_t              callcnt = 0;
+        data_t              *data = NULL;
+        struct volume_mark  *volmark = NULL;
+        struct marker_str   *marker = NULL;
+        char                *vol_uuid;
+
+
+        if (!this || !frame || !cookie) {
+                gf_log (this->name, GF_LOG_DEBUG, "possible NULL deref");
+                goto out;
+        }
+
+        marker = frame->local;
+
+        if (!marker) {
+                gf_log (this->name, GF_LOG_DEBUG, "possible NULL deref");
+                goto out;
+        }
+
+        vol_uuid = marker->vol_uuid;
+
+        if (op_ret && (ENOENT == op_errno)) {
+                LOCK (&frame->lock);
+                {
+                        callcnt = --marker->call_count;
+                        marker->enoent_count++;
+                }
+                goto done;
+        }
+
+        if (op_ret && (ENOTCONN == op_errno)) {
+                LOCK (&frame->lock);
+                {
+                        callcnt = --marker->call_count;
+                        marker->enotconn_count++;
+                }
+                goto done;
+        }
+
+        if (!(data = dict_get (dict, GF_XATTR_MARKER_KEY))) {
+                LOCK (&frame->lock);
+                {
+                        callcnt = --marker->call_count;
+                }
+                goto done;
+        }
+
+        volmark = (struct volume_mark *)data->data;
+
+        LOCK (&frame->lock);
+        {
+                callcnt = --marker->call_count;
+
+                if (marker_has_volinfo (marker)) {
+
+                        if ((marker->volmark->major != volmark->major) ||
+                            (marker->volmark->minor != volmark->minor)) {
+                                op_ret = -1;
+                                op_errno = EINVAL;
+                                goto out;
+                        }
+                        else if (volmark->retval) {
+                                data_unref ((data_t *) marker->volmark);
+                                marker->volmark = volmark;
+                                callcnt = 0;
+                        }
+                        else if ( (volmark->sec > marker->volmark->sec) ||
+                                   ((volmark->sec == marker->volmark->sec)
+                                      && (volmark->usec >= marker->volmark->usec))) {
+
+                                marker->volmark = volmark;
+                        }
+
+                } else {
+                        marker->volmark = volmark;
+                        uuid_unparse (volmark->uuid, vol_uuid);
+                        if (volmark->retval)
+                                callcnt = 0;
+                }
+        }
+done:
+        UNLOCK (&frame->lock);
+
+        if (!callcnt) {
+                op_ret = 0;
+                op_errno = 0;
+                if (marker_has_volinfo (marker)) {
+                        if (!dict) {
+                                dict = dict_new();
+                                if (!dict) {
+                                        op_ret = -1;
+                                        op_errno = ENOMEM;
+                                        goto out;
+                                }
+                        }
+                        if (dict_set_static_bin (dict, GF_XATTR_MARKER_KEY,
+                                          marker->volmark,
+                                          sizeof (struct volume_mark))) {
+                                op_ret = -1;
+                                op_errno = ENOMEM;
+                        }
+                        goto out;
+                }
+                if (marker->enotconn_count) {
+                        op_ret = -1;
+                        op_errno = ENOTCONN;
+                        goto out;
+                }
+                if (marker->enoent_count) {
+                        op_ret = -1;
+                        op_errno = ENOENT;
+                }
+                else {
+                        op_ret = -1;
+                        op_errno = EINVAL;
+                }
+
+ out:
+                if (marker->xl_specf_unwind) {
+                        frame->local = marker->xl_local;
+                        marker->xl_specf_unwind (getxattr, frame, op_ret,
+                                                 op_errno, dict);
+                        return 0;
+                }
+                STACK_UNWIND_STRICT (getxattr, frame, op_ret, op_errno, dict);
+        }
+        return 0;
+}
+
+
+int32_t
+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               i;
+        struct marker_str *local;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (loc, err);
+        VALIDATE_OR_GOTO (loc->path, err);
+        VALIDATE_OR_GOTO (loc->inode, err);
+        VALIDATE_OR_GOTO (name, err);
+        VALIDATE_OR_GOTO (xl_specf_getxattr_unwind, err);
+
+        local = GF_CALLOC (sizeof (struct marker_str), 1,
+                            gf_common_mt_libxl_marker_local);
+
+        local->xl_local = xl_local;
+        frame->local = local;
+
+        local->call_count = count;
+
+        local->xl_specf_unwind = xl_specf_getxattr_unwind;
+
+        local->vol_uuid = vol_uuid;
+
+        for (i=0; i < count; i++) {
+                if (MARKER_UUID_TYPE == type)
+                        STACK_WIND (frame, cluster_markeruuid_cbk,
+                                    *(sub_volumes + i),
+                                    (*(sub_volumes + i))->fops->getxattr,
+                                    loc, name);
+                else if (MARKER_XTIME_TYPE == type)
+                        STACK_WIND (frame, cluster_markerxtime_cbk,
+                                    *(sub_volumes + i),
+                                    (*(sub_volumes + i))->fops->getxattr,
+                                    loc, name);
+                else {
+                        gf_log (this->name, GF_LOG_WARNING,
+                                 "Unrecognized type of marker attr recived");
+                        STACK_WIND (frame, default_getxattr_cbk,
+                                    *(sub_volumes + i),
+                                    (*(sub_volumes + i))->fops->getxattr,
+                                    loc, name);
+                        break;
+                }
+        }
+
+        return 0;
+err:
+        return -1;
+
+}
diff --git a/xlators/lib/src/libxlator.h b/xlators/lib/src/libxlator.h
new file mode 100644
index 000000000..be8a00936
--- /dev/null
+++ b/xlators/lib/src/libxlator.h
@@ -0,0 +1,86 @@
+#ifndef _LIBXLATOR_H
+#define _LIBXLATOR_H
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "logging.h"
+#include "defaults.h"
+#include "common-utils.h"
+#include "compat.h"
+#include "compat-errno.h"
+
+
+#define MARKER_XATTR_PREFIX "trusted.glusterfs"
+#define XTIME               "xtime"
+#define VOLUME_MARK         "volume-mark"
+#define GF_XATTR_MARKER_KEY MARKER_XATTR_PREFIX "." VOLUME_MARK
+#define UUID_SIZE 36
+#define MARKER_UUID_TYPE    1
+#define MARKER_XTIME_TYPE   2
+
+
+typedef int32_t (*xlator_specf_unwind_t) (void *getxattr, call_frame_t *frame,
+                                         int op_ret, int op_errno, dict_t *dict);
+
+
+struct volume_mark {
+        uint8_t major;
+        uint8_t minor;
+        uint8_t uuid[16];
+        uint8_t retval;
+        uint32_t sec;
+        uint32_t usec;
+}__attribute__ ((__packed__));
+
+struct marker_str {
+        struct volume_mark    *volmark;
+        data_t                *data;
+
+        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;
+
+        xlator_specf_unwind_t  xl_specf_unwind;
+        void                  *xl_local;
+        char                  *vol_uuid;
+};
+
+static inline gf_boolean_t
+marker_has_volinfo (struct marker_str *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);
+
+int32_t
+cluster_markeruuid_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                        int op_ret, int op_errno, dict_t *dict);
+
+int32_t
+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
+match_uuid_local (const char *name, char *uuid);
+
+
+
+
+#endif /* !_LIBXLATOR_H */