path: root/xlators/cluster/afr/src/afr.c

/*
  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 <libgen.h>
#include <unistd.h>
#include <fnmatch.h>
#include <sys/time.h>
#include <stdlib.h>
#include <signal.h>

#include "afr-common.c"
#include "afr-messages.h"

struct volume_options options[];

static char *afr_favorite_child_policies[AFR_FAV_CHILD_POLICY_MAX + 1] = {
        [AFR_FAV_CHILD_NONE] = "none",
        [AFR_FAV_CHILD_BY_SIZE] = "size",
        [AFR_FAV_CHILD_BY_CTIME] = "ctime",
        [AFR_FAV_CHILD_BY_MTIME] = "mtime",
        [AFR_FAV_CHILD_BY_MAJORITY] = "majority",
        [AFR_FAV_CHILD_POLICY_MAX] = NULL,
};

int32_t
notify (xlator_t *this, int32_t event,
        void *data, ...)
{
        int ret = -1;
        va_list         ap;
        void *data2 = NULL;

        va_start (ap, data);
        data2 = va_arg (ap, dict_t*);
        va_end (ap);
        ret = afr_notify (this, event, data, data2);

        return ret;
}

int32_t
mem_acct_init (xlator_t *this)
{
        int     ret = -1;

        if (!this)
                return ret;

        ret = xlator_mem_acct_init (this, gf_afr_mt_end + 1);

        if (ret != 0) {
                return ret;
        }

        return ret;
}


int
xlator_subvolume_index (xlator_t *this, xlator_t *subvol)
{
        int index = -1;
        int i = 0;
        xlator_list_t *list = NULL;

        list = this->children;

        while (list) {
                if (subvol == list->xlator ||
                    strcmp (subvol->name, list->xlator->name) == 0) {
                        index = i;
                        break;
                }
                list = list->next;
                i++;
        }

        return index;
}

static void
fix_quorum_options (xlator_t *this, afr_private_t *priv, char *qtype,
                    dict_t *options)
{

        if (dict_get (options, "quorum-type") == NULL) {
                /* If user doesn't configure anything enable auto-quorum if the
                 * replica has more than two subvolumes */
                if (priv->child_count > 2)
                        qtype = "auto";
        }

        if (priv->quorum_count && strcmp (qtype, "fixed")) {
                gf_msg (this->name,GF_LOG_WARNING, 0, AFR_MSG_QUORUM_OVERRIDE,
                       "quorum-type %s overriding quorum-count %u",
                       qtype, priv->quorum_count);
        }

        if (!strcmp (qtype, "none")) {
                priv->quorum_count = 0;
        } else if (!strcmp (qtype, "auto")) {
                priv->quorum_count = AFR_QUORUM_AUTO;
        }

}

int
afr_set_favorite_child_policy (afr_private_t *priv, char *policy)
{
        int index = -1;

        index = gf_get_index_by_elem (afr_favorite_child_policies, policy);
        if (index  < 0 || index >= AFR_FAV_CHILD_POLICY_MAX)
                return -1;

        priv->fav_child_policy = index;

        return 0;
}
int
reconfigure (xlator_t *this, dict_t *options)
{
        afr_private_t *priv        = NULL;
        xlator_t      *read_subvol = NULL;
        int            read_subvol_index = -1;
        int            ret         = -1;
        int            index       = -1;
        char          *qtype       = NULL;
        char          *fav_child_policy = NULL;
        gf_boolean_t   consistent_io = _gf_false;
        gf_boolean_t   choose_local_old = _gf_false;

        priv = this->private;

	GF_OPTION_RECONF ("afr-dirty-xattr",
			  priv->afr_dirty, options, str,
			  out);

	GF_OPTION_RECONF ("metadata-splitbrain-forced-heal",
			  priv->metadata_splitbrain_forced_heal, options, bool,
			  out);

        GF_OPTION_RECONF ("background-self-heal-count",
                          priv->background_self_heal_count, options, uint32,
                          out);

        GF_OPTION_RECONF ("heal-wait-queue-length",
                          priv->heal_wait_qlen, options, uint32, out);


        GF_OPTION_RECONF ("metadata-self-heal",
                          priv->metadata_self_heal, options, bool, out);

        GF_OPTION_RECONF ("data-self-heal", priv->data_self_heal, options, str,
                          out);

        GF_OPTION_RECONF ("entry-self-heal", priv->entry_self_heal, options,
                          bool, out);

        GF_OPTION_RECONF ("data-self-heal-window-size",
                          priv->data_self_heal_window_size, options,
                          uint32, out);

        GF_OPTION_RECONF ("data-self-heal-algorithm",
                          priv->data_self_heal_algorithm, options, str, out);

        GF_OPTION_RECONF ("halo-enabled",
                          priv->halo_enabled, options, bool,
                          out);

        GF_OPTION_RECONF ("halo-shd-max-latency",
                          priv->shd.halo_max_latency_msec, options, uint32,
                          out);

        GF_OPTION_RECONF ("halo-nfsd-max-latency",
                          priv->nfsd.halo_max_latency_msec, options, uint32,
                          out);

        GF_OPTION_RECONF ("halo-max-latency", priv->halo_max_latency_msec,
                          options, uint32, out);

        GF_OPTION_RECONF ("halo-max-replicas", priv->halo_max_replicas, options,
                              uint32, out);

        GF_OPTION_RECONF ("halo-min-replicas", priv->halo_min_replicas, options,
                              uint32, out);

        GF_OPTION_RECONF ("read-subvolume", read_subvol, options, xlator, out);

        choose_local_old = priv->choose_local;
        GF_OPTION_RECONF ("choose-local", priv->choose_local, options, bool,
                          out);

        if (choose_local_old != priv->choose_local) {
                priv->read_child = -1;
                if (choose_local_old == _gf_false)
                        priv->did_discovery = _gf_false;
        }

        GF_OPTION_RECONF ("read-hash-mode", priv->hash_mode,
                          options, uint32, out);

        if (read_subvol) {
                index = xlator_subvolume_index (this, read_subvol);
                if (index == -1) {
                        gf_msg (this->name, GF_LOG_ERROR, 0,
                                AFR_MSG_INVALID_SUBVOL, "%s not a subvolume",
                                read_subvol->name);
                        goto out;
                }
                priv->read_child = index;
        }

        GF_OPTION_RECONF ("read-subvolume-index",read_subvol_index, options,int32,out);

        if (read_subvol_index >-1) {
                index=read_subvol_index;
                if (index >= priv->child_count) {
                        gf_msg (this->name, GF_LOG_ERROR, 0,
                                AFR_MSG_INVALID_SUBVOL,
                                "%d not a subvolume-index", index);
                        goto out;
                }
                priv->read_child = index;
        }

        GF_OPTION_RECONF ("pre-op-compat", priv->pre_op_compat, options, bool,
                          out);
        GF_OPTION_RECONF ("locking-scheme", priv->locking_scheme, options, str,
                          out);
        GF_OPTION_RECONF ("full-lock", priv->full_lock, options, bool, out);
        GF_OPTION_RECONF ("granular-entry-heal", priv->esh_granular, options,
                          bool, out);

        GF_OPTION_RECONF ("eager-lock", priv->eager_lock, options, bool, out);
        GF_OPTION_RECONF ("quorum-type", qtype, options, str, out);
        GF_OPTION_RECONF ("quorum-count", priv->quorum_count, options,
                          uint32, out);
        fix_quorum_options (this, priv, qtype, options);
        if (priv->quorum_count && !afr_has_quorum (priv->child_up, this))
                gf_msg (this->name, GF_LOG_WARNING, 0, AFR_MSG_QUORUM_FAIL,
                        "Client-quorum is not met");


	GF_OPTION_RECONF ("post-op-delay-secs", priv->post_op_delay_secs, options,
			  uint32, out);

        GF_OPTION_RECONF (AFR_SH_READDIR_SIZE_KEY, priv->sh_readdir_size,
                          options, size_uint64, out);
        /* Reset this so we re-discover in case the topology changed.  */
        GF_OPTION_RECONF ("ensure-durability", priv->ensure_durability, options,
                          bool, out);

	GF_OPTION_RECONF ("self-heal-daemon", priv->shd.enabled, options,
			  bool, out);

	GF_OPTION_RECONF ("iam-self-heal-daemon", priv->shd.iamshd, options,
			  bool, out);

        GF_OPTION_RECONF ("heal-timeout", priv->shd.timeout, options,
                          int32, out);

        GF_OPTION_RECONF ("consistent-metadata", priv->consistent_metadata,
                          options, bool, out);

        GF_OPTION_RECONF ("shd-max-threads", priv->shd.max_threads,
                          options, uint32, out);

        GF_OPTION_RECONF ("shd-wait-qlength", priv->shd.wait_qlength,
                          options, uint32, out);

        GF_OPTION_RECONF ("favorite-child-policy", fav_child_policy, options,
                          str, out);
        if (afr_set_favorite_child_policy (priv, fav_child_policy) == -1)
                goto out;

        priv->did_discovery = _gf_false;

        GF_OPTION_RECONF ("consistent-io", consistent_io, options, bool, out);
        if (priv->quorum_count != 0)
                consistent_io = _gf_false;
        priv->consistent_io = consistent_io;

        ret = 0;
out:
        return ret;

}

static int
afr_pending_xattrs_init (afr_private_t *priv, xlator_t *this)
{
        int ret = -1;
        int i = 0;
        char *ptr = NULL;
        char *ptr1 = NULL;
        char *xattrs_list = NULL;
        xlator_list_t *trav = NULL;
        int child_count = -1;

        trav = this->children;
        child_count = priv->child_count;
        if (priv->thin_arbiter_count) {
                /* priv->pending_key[THIN_ARBITER_BRICK_INDEX] is used as the
                 * name of the thin arbiter file for persistence across add/
                 * removal of DHT subvols.*/
                child_count++;
        }

        GF_OPTION_INIT ("afr-pending-xattr", xattrs_list, str, out);
        priv->pending_key = GF_CALLOC (sizeof (*priv->pending_key),
                                       child_count, gf_afr_mt_char);
        if (!priv->pending_key) {
                ret = -ENOMEM;
                goto out;
        }
        if (!xattrs_list) {
                gf_msg (this->name, GF_LOG_WARNING, 0, AFR_MSG_NO_CHANGELOG,
                        "Unable to fetch afr-pending-xattr option from volfile."
                        " Falling back to using client translator names. ");

                while (i < child_count) {
                        ret = gf_asprintf (&priv->pending_key[i], "%s.%s",
                                           AFR_XATTR_PREFIX,
                                           trav->xlator->name);
                        if (ret == -1) {
                                ret = -ENOMEM;
                                goto out;
                        }
                        trav = trav->next;
                        i++;
                }
                ret = 0;
                goto out;
        }

        ptr = ptr1 = gf_strdup (xattrs_list);
        if (!ptr) {
                ret = -ENOMEM;
                goto out;
        }
        for (i = 0, ptr = strtok (ptr, ","); ptr; ptr = strtok (NULL, ",")) {
                ret = gf_asprintf (&priv->pending_key[i], "%s.%s",
                                   AFR_XATTR_PREFIX, ptr);
                if (ret == -1) {
                        ret = -ENOMEM;
                        goto out;
                }
                i++;
        }
        ret = 0;

out:
        GF_FREE (ptr1);
        return ret;

}

int32_t
init (xlator_t *this)
{
        afr_private_t *priv        = NULL;
        int            child_count = 0;
        xlator_list_t *trav        = NULL;
        int            i           = 0;
        int            ret         = -1;
        GF_UNUSED int  op_errno    = 0;
        xlator_t      *read_subvol = NULL;
        int            read_subvol_index = -1;
        char          *qtype       = NULL;
        char          *fav_child_policy = NULL;
        char          *thin_arbiter = NULL;

        if (!this->children) {
                gf_msg (this->name, GF_LOG_ERROR, 0,
                        AFR_MSG_CHILD_MISCONFIGURED,
                        "replicate translator needs more than one "
                        "subvolume defined.");
                return -1;
        }

        if (!this->parents) {
                gf_msg (this->name, GF_LOG_WARNING, 0,
                        AFR_MSG_VOL_MISCONFIGURED, "Volume is dangling.");
        }

	this->private = GF_CALLOC (1, sizeof (afr_private_t),
                                   gf_afr_mt_afr_private_t);
        if (!this->private)
                goto out;

        priv = this->private;
        LOCK_INIT (&priv->lock);

        child_count = xlator_subvolume_count (this);

        priv->child_count = child_count;

        priv->read_child = -1;

        GF_OPTION_INIT ("arbiter-count", priv->arbiter_count, uint32, out);
        GF_OPTION_INIT ("thin-arbiter", thin_arbiter, str, out);
        if (thin_arbiter && strlen(thin_arbiter) > 0) {
                priv->thin_arbiter_count = 1;
                priv->child_count--;
                priv->ta_bad_child_index = AFR_CHILD_UNKNOWN;
                priv->ta_notify_dom_lock_offset = 0;
        }
        INIT_LIST_HEAD (&priv->healing);
        INIT_LIST_HEAD (&priv->heal_waiting);

        priv->spb_choice_timeout = AFR_DEFAULT_SPB_CHOICE_TIMEOUT;

	GF_OPTION_INIT ("afr-dirty-xattr", priv->afr_dirty, str, out);

	GF_OPTION_INIT ("metadata-splitbrain-forced-heal",
			priv->metadata_splitbrain_forced_heal, bool, out);

        GF_OPTION_INIT ("read-subvolume", read_subvol, xlator, out);
        if (read_subvol) {
                priv->read_child = xlator_subvolume_index (this, read_subvol);
                if (priv->read_child == -1) {
                        gf_msg (this->name, GF_LOG_ERROR, 0,
                                AFR_MSG_INVALID_SUBVOL, "%s not a subvolume",
                                read_subvol->name);
                        goto out;
                }
        }
        GF_OPTION_INIT ("read-subvolume-index",read_subvol_index,int32,out);
        if (read_subvol_index > -1) {
                if (read_subvol_index >= priv->child_count) {
                        gf_msg (this->name, GF_LOG_ERROR, 0,
                                AFR_MSG_INVALID_SUBVOL,
                                "%d not a subvolume-index", read_subvol_index);
                        goto out;
                }
                priv->read_child = read_subvol_index;
        }
        GF_OPTION_INIT ("choose-local", priv->choose_local, bool, out);

        priv->pending_reads = GF_CALLOC (sizeof(*priv->pending_reads),
                                         priv->child_count, gf_afr_mt_atomic_t);

        GF_OPTION_INIT ("read-hash-mode", priv->hash_mode, uint32, out);

        priv->favorite_child = -1;

        GF_OPTION_INIT ("favorite-child-policy", fav_child_policy, str, out);
        if (afr_set_favorite_child_policy(priv, fav_child_policy) == -1)
                goto out;

        GF_OPTION_INIT ("shd-max-threads", priv->shd.max_threads,
                         uint32, out);

        GF_OPTION_INIT ("shd-wait-qlength", priv->shd.wait_qlength,
                         uint32, out);

        GF_OPTION_INIT ("background-self-heal-count",
                        priv->background_self_heal_count, uint32, out);

        GF_OPTION_INIT ("heal-wait-queue-length",
                        priv->heal_wait_qlen, uint32, out);

        GF_OPTION_INIT ("data-self-heal", priv->data_self_heal, str, out);

        GF_OPTION_INIT ("data-self-heal-algorithm",
                        priv->data_self_heal_algorithm, str, out);

        GF_OPTION_INIT ("data-self-heal-window-size",
                        priv->data_self_heal_window_size, uint32, out);

        GF_OPTION_INIT ("metadata-self-heal", priv->metadata_self_heal, bool,
                        out);

        GF_OPTION_INIT ("entry-self-heal", priv->entry_self_heal, bool, out);

        GF_OPTION_INIT ("halo-shd-max-latency", priv->shd.halo_max_latency_msec,
                        uint32, out);

        GF_OPTION_INIT ("halo-max-latency", priv->halo_max_latency_msec,
                        uint32, out);
        GF_OPTION_INIT ("halo-max-replicas", priv->halo_max_replicas, uint32,
                        out);
        GF_OPTION_INIT ("halo-min-replicas", priv->halo_min_replicas, uint32,
                        out);

        GF_OPTION_INIT ("halo-enabled",
                        priv->halo_enabled, bool, out);

        GF_OPTION_INIT ("halo-nfsd-max-latency",
                        priv->nfsd.halo_max_latency_msec, uint32, out);

        GF_OPTION_INIT ("iam-nfs-daemon", priv->nfsd.iamnfsd, bool, out);

        GF_OPTION_INIT ("optimistic-change-log", priv->optimistic_change_log,
                        bool, out);

        GF_OPTION_INIT ("pre-op-compat", priv->pre_op_compat, bool, out);
        GF_OPTION_INIT ("locking-scheme", priv->locking_scheme, str, out);
        GF_OPTION_INIT ("full-lock", priv->full_lock, bool, out);
        GF_OPTION_INIT ("granular-entry-heal", priv->esh_granular, bool, out);

        GF_OPTION_INIT ("eager-lock", priv->eager_lock, bool, out);
        GF_OPTION_INIT ("quorum-type", qtype, str, out);
        GF_OPTION_INIT ("quorum-count", priv->quorum_count, uint32, out);
        GF_OPTION_INIT (AFR_SH_READDIR_SIZE_KEY, priv->sh_readdir_size, size_uint64,
                        out);
        fix_quorum_options (this, priv, qtype, this->options);

	GF_OPTION_INIT ("post-op-delay-secs", priv->post_op_delay_secs, uint32, out);
        GF_OPTION_INIT ("ensure-durability", priv->ensure_durability, bool,
                        out);

	GF_OPTION_INIT ("self-heal-daemon", priv->shd.enabled, bool, out);

	GF_OPTION_INIT ("iam-self-heal-daemon", priv->shd.iamshd, bool, out);
        GF_OPTION_INIT ("heal-timeout", priv->shd.timeout, int32, out);

        GF_OPTION_INIT ("consistent-metadata", priv->consistent_metadata, bool,
                        out);
        GF_OPTION_INIT ("consistent-io", priv->consistent_io, bool, out);

        if (priv->quorum_count != 0)
                priv->consistent_io = _gf_false;

        priv->wait_count = 1;

        priv->local = GF_CALLOC (sizeof (unsigned char), child_count,
                                 gf_afr_mt_char);
        if (!priv->local) {
                ret = -ENOMEM;
                goto out;
        }

        priv->child_up = GF_CALLOC (sizeof (unsigned char), child_count,
                                    gf_afr_mt_char);

        priv->child_latency = GF_MALLOC (sizeof (*priv->child_latency)
                                         * child_count,
                                         gf_afr_mt_child_latency_t);

        if (!priv->child_up || !priv->child_latency) {
                ret = -ENOMEM;
                goto out;
        }
        /*Initialize to -ve ping timeout so that they are not considered
         * in child-up events until ping-event comes*/
        for (i = 0; i < child_count; i++)
                priv->child_latency[i] = -1;

        priv->children = GF_CALLOC (sizeof (xlator_t *), child_count,
                                    gf_afr_mt_xlator_t);
        if (!priv->children) {
                ret = -ENOMEM;
                goto out;
        }

        ret = afr_pending_xattrs_init (priv, this);
        if (ret)
                goto out;

        trav = this->children;
        i = 0;
        while (i < child_count) {
                priv->children[i] = trav->xlator;
                trav = trav->next;
                i++;
        }

        ret = gf_asprintf (&priv->sh_domain, AFR_SH_DATA_DOMAIN_FMT,
                           this->name);
        if (-1 == ret) {
                ret = -ENOMEM;
                goto out;
        }

        priv->last_event = GF_CALLOC (child_count, sizeof (*priv->last_event),
                                      gf_afr_mt_int32_t);
        if (!priv->last_event) {
                ret = -ENOMEM;
                goto out;
        }

	ret = afr_selfheal_daemon_init (this);
	if (ret) {
		ret = -ENOMEM;
		goto out;
	}

        /* keep more local here as we may need them for self-heal etc */
        this->local_pool = mem_pool_new (afr_local_t, 512);
        if (!this->local_pool) {
                ret = -1;
                goto out;
        }

        priv->root_inode = NULL;

        ret = 0;
out:
        return ret;
}


int
fini (xlator_t *this)
{
        afr_private_t *priv = NULL;

        priv = this->private;
        LOCK (&priv->lock);
        if (priv->timer != NULL) {
                gf_timer_call_cancel(this->ctx, priv->timer);
                priv->timer = NULL;
        }
        UNLOCK (&priv->lock);
        this->private = NULL;
        afr_priv_destroy (priv);
        //if (this->itable);//I don't see any destroy func

        return 0;
}


struct xlator_fops fops = {
        .lookup      = afr_lookup,
        .lk          = afr_lk,
        .flush       = afr_flush,
        .statfs      = afr_statfs,
        .fsyncdir    = afr_fsyncdir,
        .inodelk     = afr_inodelk,
        .finodelk    = afr_finodelk,
        .entrylk     = afr_entrylk,
        .fentrylk    = afr_fentrylk,
        .ipc         = afr_ipc,
        .lease       = afr_lease,

        /* inode read */
        .access      = afr_access,
        .stat        = afr_stat,
        .fstat       = afr_fstat,
        .readlink    = afr_readlink,
        .getxattr    = afr_getxattr,
        .fgetxattr   = afr_fgetxattr,
        .readv       = afr_readv,

        /* inode write */
        .writev      = afr_writev,
        .truncate    = afr_truncate,
        .ftruncate   = afr_ftruncate,
        .setxattr    = afr_setxattr,
        .fsetxattr   = afr_fsetxattr,
        .setattr     = afr_setattr,
        .fsetattr    = afr_fsetattr,
        .removexattr = afr_removexattr,
        .fremovexattr = afr_fremovexattr,
        .fallocate   = afr_fallocate,
        .discard     = afr_discard,
        .zerofill    = afr_zerofill,
        .xattrop     = afr_xattrop,
        .fxattrop    = afr_fxattrop,
        .fsync       = afr_fsync,

        /*inode open*/
        .opendir     = afr_opendir,
        .open        = afr_open,

        /* dir read */
        .readdir     = afr_readdir,
        .readdirp    = afr_readdirp,

        /* dir write */
        .create      = afr_create,
        .mknod       = afr_mknod,
        .mkdir       = afr_mkdir,
        .unlink      = afr_unlink,
        .rmdir       = afr_rmdir,
        .link        = afr_link,
        .symlink     = afr_symlink,
        .rename      = afr_rename,
};


struct xlator_dumpops dumpops = {
        .priv       = afr_priv_dump,
};


struct xlator_cbks cbks = {
        .release     = afr_release,
        .releasedir  = afr_releasedir,
        .forget      = afr_forget,
};


struct volume_options options[] = {
        { .key  = {"read-subvolume" },
          .type = GF_OPTION_TYPE_XLATOR,
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "inode-read fops happen only on one of the bricks in "
                         "replicate. Afr will prefer the one specified using "
                         "this option if it is not stale. Option value must be "
                         "one of the xlator names of the children. "
                         "Ex: <volname>-client-0 till "
                         "<volname>-client-<number-of-bricks - 1>"
        },
        { .key  = {"read-subvolume-index" },
          .type = GF_OPTION_TYPE_INT,
          .default_value = "-1",
          .op_version = {2},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "inode-read fops happen only on one of the bricks in "
                         "replicate. AFR will prefer the one specified using "
                         "this option if it is not stale. allowed options"
                         " include -1 till replica-count - 1"
        },
        { .key = {"read-hash-mode" },
          .type = GF_OPTION_TYPE_INT,
          .min = 0,
          .max = 3,
          .default_value = "1",
          .op_version = {2},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "inode-read fops happen only on one of the bricks in "
                         "replicate. AFR will prefer the one computed using "
                         "the method specified using this option.\n"
                         "0 = first readable child of AFR, starting from 1st child.\n"
                         "1 = hash by GFID of file (all clients use "
                                                    "same subvolume).\n"
                         "2 = hash by GFID of file and client PID.\n"
                         "3 = brick having the least outstanding read requests."
        },
        { .key  = {"choose-local" },
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "true",
          .op_version = {2},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "Choose a local subvolume (i.e. Brick) to read from"
	                 " if read-subvolume is not explicitly set.",
        },
        { .key  = {"background-self-heal-count"},
          .type = GF_OPTION_TYPE_INT,
          .min  = 0,
          .max  = 256,
          .default_value = "8",
          .validate = GF_OPT_VALIDATE_MIN,
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "This specifies the number of per client self-heal "
                         "jobs that can perform parallel heals in the "
                         "background."
        },
        { .key   = {"halo-shd-max-latency"},
          .type  = GF_OPTION_TYPE_INT,
          .min   = 1,
          .max   = 99999,
          .default_value = "99999",
          .op_version = {GD_OP_VERSION_3_11_0},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate", "halo"},
          .description = "Maximum latency for shd halo replication in msec."
        },
        { .key   = {"halo-enabled"},
          .type  = GF_OPTION_TYPE_BOOL,
          .default_value = "False",
          .op_version = {GD_OP_VERSION_3_11_0},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate", "halo"},
          .description = "Enable Halo (geo) replication mode."
        },
        { .key   = {"halo-nfsd-max-latency"},
          .type  = GF_OPTION_TYPE_INT,
          .min   = 1,
          .max   = 99999,
          .default_value = "5",
          .op_version = {GD_OP_VERSION_3_11_0},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate", "halo"},
          .description = "Maximum latency for nfsd halo replication in msec."
        },
        { .key   = {"halo-max-latency"},
          .type  = GF_OPTION_TYPE_INT,
          .min   = 1,
          .max   = AFR_HALO_MAX_LATENCY,
          .default_value = "5",
          .op_version = {GD_OP_VERSION_3_11_0},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate", "halo"},
          .description = "Maximum latency for halo replication in msec."
        },
        { .key   = {"halo-max-replicas"},
          .type  = GF_OPTION_TYPE_INT,
          .min   = 1,
          .max   = 99999,
          .default_value = "99999",
          .op_version = {GD_OP_VERSION_3_11_0},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate", "halo"},
          .description = "The maximum number of halo replicas; replicas"
                          " beyond this value will be written asynchronously"
                          "via the SHD."
        },
        { .key   = {"halo-min-replicas"},
          .type  = GF_OPTION_TYPE_INT,
          .min   = 1,
          .max   = 99999,
          .default_value = "2",
          .op_version = {GD_OP_VERSION_3_11_0},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate", "halo"},
          .description = "The minimmum number of halo replicas, before adding "
                          "out of region replicas."
         },
         { .key  = {"heal-wait-queue-length"},
          .type = GF_OPTION_TYPE_INT,
          .min  = 0,
          .max  = 10000, /*Around 100MB with sizeof(afr_local_t)= 10496 bytes*/
          .default_value = "128",
          .validate = GF_OPT_VALIDATE_MIN,
          .op_version = {GD_OP_VERSION_3_7_10},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "This specifies the number of heals that can be queued"
                         " for the parallel background self heal jobs."
        },
        { .key  = {"data-self-heal"},
          .type = GF_OPTION_TYPE_STR,
          .value = {"1", "on", "yes", "true", "enable",
                    "0", "off", "no", "false", "disable",
                    "open"},
          .default_value = "on",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description   = "Using this option we can enable/disable data "
                           "self-heal on the file. \"open\" means data "
                           "self-heal action will only be triggered by file "
                           "open operations."
        },
        { .key  = {"data-self-heal-algorithm"},
          .type = GF_OPTION_TYPE_STR,
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description   = "Select between \"full\", \"diff\". The "
                           "\"full\" algorithm copies the entire file from "
                           "source to sink. The \"diff\" algorithm copies to "
                           "sink only those blocks whose checksums don't match "
                           "with those of source. If no option is configured "
                           "the option is chosen dynamically as follows: "
                           "If the file does not exist on one of the sinks "
                           "or empty file exists or if the source file size is "
                           "about the same as page size the entire file will "
                           "be read and written i.e \"full\" algo, "
                           "otherwise \"diff\" algo is chosen.",
          .value = { "diff", "full"}
        },
        { .key  = {"data-self-heal-window-size"},
          .type = GF_OPTION_TYPE_INT,
          .min  = 1,
          .max  = 1024,
          .default_value = "1",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "Maximum number blocks per file for which self-heal "
                         "process would be applied simultaneously."
        },
        { .key  = {"metadata-self-heal"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "on",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          /*.validate_fn = validate_replica*/
          .description = "Using this option we can enable/disable metadata "
                         "i.e. Permissions, ownerships, xattrs self-heal on "
                         "the file/directory."
        },
        { .key  = {"entry-self-heal"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "on",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          /*.validate_fn = validate_replica*/
          .description = "Using this option we can enable/disable entry "
                         "self-heal on the directory."
        },
        { .key  = {"data-change-log"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "on",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "This option exists only for backward compatibility "
                         "and configuring it doesn't have any effect"
        },
        { .key  = {"metadata-change-log"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "on",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "This option exists only for backward compatibility "
                         "and configuring it doesn't have any effect"
        },
        { .key  = {"entry-change-log"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "on",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "This option exists only for backward compatibility "
                         "and configuring it doesn't have any effect"
        },
        { .key  = {"optimistic-change-log"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "on",
          .description = "Entry/Metadata fops will not perform "
                         "pre fop changelog operations in afr transaction "
                         "if this option is enabled."
        },
        { .key = {"inodelk-trace"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "off",
          .description = "Enabling this option logs inode lock/unlocks"
        },
        { .key = {"entrylk-trace"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "off",
          .description = "Enabling this option logs entry lock/unlocks"
        },
	{ .key = {"pre-op-compat"},
	  .type = GF_OPTION_TYPE_BOOL,
	  .default_value = "on",
	  .description = "Use separate pre-op xattrop() FOP rather than "
	                 "overloading xdata of the OP"
	},
        { .key = {"eager-lock"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "on",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "Enable/Disable eager lock for replica volume. "
                         "Lock phase of a transaction has two sub-phases. "
                         "First is an attempt to acquire locks in parallel by "
                         "broadcasting non-blocking lock requests. If lock "
                         "acquisition fails on any server, then the held locks "
                         "are unlocked and we revert to a blocking locks mode "
                         "sequentially on one server after another.  If this "
                         "option is enabled the initial broadcasting lock "
                         "request attempts to acquire a full lock on the entire file. "
                         "If this fails, we revert back to the sequential "
                         "\"regional\" blocking locks as before. In the case "
                         "where such an \"eager\" lock is granted in the "
                         "non-blocking phase, it gives rise to an opportunity "
                         "for optimization. i.e, if the next write transaction "
                         "on the same FD arrives before the unlock phase of "
                         "the first transaction, it \"takes over\" the full "
                         "file lock. Similarly if yet another data transaction "
                         "arrives before the unlock phase of the \"optimized\" "
                         "transaction, that in turn \"takes over\" the lock as "
                         "well. The actual unlock now happens at the end of "
                         "the last \"optimized\" transaction."

        },
        { .key = {"self-heal-daemon"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "on",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE,
          .tags = {"replicate"},
          /*.validate_fn   = validate_replica_heal_enable_disable*/
          .description = "This option applies to only self-heal-daemon. "
                         "Index directory crawl and automatic healing of files "
                         "will not be performed if this option is turned off."
        },
        { .key = {"iam-self-heal-daemon"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "off",
          .description = "This option differentiates if the replicate "
                         "translator is running as part of self-heal-daemon "
                         "or not."
        },
        { .key = {"iam-nfs-daemon"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "off",
          .description = "This option differentiates if the replicate "
                         "translator is running as part of an NFS daemon "
                         "or not."
        },
        { .key = {"quorum-type"},
          .type = GF_OPTION_TYPE_STR,
          .value = { "none", "auto", "fixed"},
          .default_value = "none",
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          /*.option = quorum-type*/
          .description = "If value is \"fixed\" only allow writes if "
                         "quorum-count bricks are present.  If value is "
                         "\"auto\" only allow writes if more than half of "
                         "bricks, or exactly half including the first, are "
                         "present.",
        },
        { .key = {"quorum-count"},
          .type = GF_OPTION_TYPE_INT,
          .min = 1,
          .max = INT_MAX,
          .default_value = 0,
          .op_version = {1},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          /*.option = quorum-count*/
          /*.validate_fn = validate_quorum_count*/
          .description = "If quorum-type is \"fixed\" only allow writes if "
                         "this many bricks are present.  Other quorum types "
                         "will OVERWRITE this value.",
        },
        { .key = {"quorum-reads"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "no",
          .op_version = {GD_OP_VERSION_3_7_0},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "This option has been removed. Reads are not allowed "
                          "if quorum is not met.",
        },
        { .key  = {"node-uuid"},
          .type = GF_OPTION_TYPE_STR,
          .description = "Local glusterd uuid string, used in starting "
                         "self-heal-daemon so that it can crawl only on "
                         "local index directories.",
        },
        { .key  = {"post-op-delay-secs"},
          .type = GF_OPTION_TYPE_INT,
          .min  = 0,
          .max  = INT_MAX,
          .default_value = "1",
          .op_version = {2},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "Time interval induced artificially before "
	                 "post-operation phase of the transaction to "
                         "enhance overlap of adjacent write operations.",
        },
        { .key = {AFR_SH_READDIR_SIZE_KEY},
          .type = GF_OPTION_TYPE_SIZET,
          .description = "readdirp size for performing entry self-heal",
          .min = 1024,
          .max = 131072,
          .op_version = {2},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE,
          .tags = {"replicate"},
          .default_value = "1KB",
        },
        { .key = {"ensure-durability"},
          .type = GF_OPTION_TYPE_BOOL,
          .op_version = {3},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "Afr performs fsyncs for transactions if this "
                         "option is on to make sure the changelogs/data is "
                         "written to the disk",
          .default_value = "on",
        },
	{ .key = {"afr-dirty-xattr"},
	  .type = GF_OPTION_TYPE_STR,
	  .default_value = AFR_DIRTY_DEFAULT,
	},
	{ .key = {"afr-pending-xattr"},
	  .type = GF_OPTION_TYPE_STR,
          .description = "Comma separated list of xattrs that are used to  "
                         "capture information on pending heals."
	},
	{ .key = {"metadata-splitbrain-forced-heal"},
	  .type = GF_OPTION_TYPE_BOOL,
	  .default_value = "off",
	},
        { .key  = {"heal-timeout"},
          .type = GF_OPTION_TYPE_INT,
          .min  = 5,
          .max  = INT_MAX,
          .default_value = "600",
          .op_version = {2},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "time interval for checking the need to self-heal "
                         "in self-heal-daemon"
        },
        { .key = {"consistent-metadata"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "no",
          .op_version = {GD_OP_VERSION_3_7_0},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "If this option is enabled, readdirp will force "
                         "lookups on those entries read whose read child is "
                         "not the same as that of the parent. This will "
                         "guarantee that all read operations on a file serve "
                         "attributes from the same subvol as long as it holds "
                         " a good copy of the file/dir.",
        },
        { .key = {"arbiter-count"},
          .type = GF_OPTION_TYPE_INT,
          .description = "subset of child_count. Has to be 0 or 1."
        },
        { .key = {"thin-arbiter"},
          .type = GF_OPTION_TYPE_STR,
          .op_version = {GD_OP_VERSION_4_1_0},
          .flags = OPT_FLAG_SETTABLE,
          .tags = {"replicate"},
          .description = "contains host:path of thin abriter brick",
        },
        { .key   = {"shd-max-threads"},
          .type  = GF_OPTION_TYPE_INT,
          .min   = 1,
          .max   = 64,
          .default_value = "1",
          .op_version = {GD_OP_VERSION_3_7_12},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "Maximum number of parallel heals SHD can do per "
                          "local brick. This can substantially lower heal times"
                          ", but can also crush your bricks if you don't have "
                          "the storage hardware to support this."
        },
        { .key   = {"shd-wait-qlength"},
          .type  = GF_OPTION_TYPE_INT,
          .min   = 1,
          .max   = 655536,
          .default_value = "1024",
          .op_version = {GD_OP_VERSION_3_7_12},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "This option can be used to control number of heals"
                          " that can wait in SHD per subvolume",
        },
        { .key = {"locking-scheme"},
          .type = GF_OPTION_TYPE_STR,
          .value = { "full", "granular"},
          .default_value = "full",
          .op_version = {GD_OP_VERSION_3_7_12},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "If this option is set to granular, self-heal will "
                         "stop being compatible with afr-v1, which helps afr "
                         "be more granular while self-healing",
        },
        { .key = {"full-lock"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "yes",
          .op_version = {GD_OP_VERSION_3_13_2},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE,
          .tags = {"replicate"},
          .description = "If this option is disabled, then the IOs will take "
                         "range locks same as versions till 3.13.1."
        },
        { .key = {"granular-entry-heal"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "no",
          .op_version = {GD_OP_VERSION_3_8_0},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "If this option is enabled, self-heal will resort to "
                         "granular way of recording changelogs and doing entry "
                         "self-heal.",
        },
        { .key   = {"favorite-child-policy"},
          .type  = GF_OPTION_TYPE_STR,
          .value = {"none", "size", "ctime", "mtime", "majority"},
          .default_value = "none",
          .op_version = {GD_OP_VERSION_3_7_12},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "This option can be used to automatically resolve "
                         "split-brains using various policies without user "
                         "intervention. \"size\" picks the file with the "
                         "biggest size as the source. \"ctime\" and \"mtime\" "
                         "pick the file with the latest ctime and mtime "
                         "respectively as the source. \"majority\" picks a file"
                         " with identical mtime and size in more than half the "
                         "number of bricks in the replica.",
        },
        { .key = {"consistent-io"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "no",
          .description = "If this option is enabled, i/o will fail even if "
                         "one of the bricks is down in the replicas",
        },
        { .key   = {"use-compound-fops"},
          .type  = GF_OPTION_TYPE_BOOL,
          .default_value = "no",
          .op_version = {GD_OP_VERSION_3_8_4},
          .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_SETTABLE | OPT_FLAG_DOC,
          .tags = {"replicate"},
          .description = "This option exists only for backward compatibility "
                         "and configuring it doesn't have any effect"
        },
        { .key  = {NULL} },
};