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authorAnand Avati <avati@gluster.com>2011-09-24 16:14:11 +0530
committerAnand Avati <avati@redhat.com>2012-02-20 21:14:28 -0800
commitc41a9d1c3fe4002bdf8849c4e8ae7c2e10841c69 (patch)
treefc206a62f4b044846bf710db85f2cc046c0551fe /xlators/performance
parent1206437fcfc1f3e1bd4a6faec3341c240bae5cf2 (diff)
md-cache: meta-data caching translator
This is a metadata caching translator which is well integrated with glusterfs core framework and leverages some of the recent protocol changes to do a better job at caching. - It uses the attributes returned along callbacks of all calls to update its attribute cache as frequently as possible without issuing calls on its own (i.e, very low overhead) - It caches attributes returned via readdirp into the inode contexts corresponding to those entries (i.e, well integrated) - It caches and updates xattrs and not just inode attributes (i.e, eliminates the need for a separate xattr-prefetch translator) In its current form it has a timeout based consistency model Change-Id: I891f6225c1a4c08bb111e287571d5f6d326dbe97 BUG: 765785 Reviewed-on: http://review.gluster.com/2713 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
Diffstat (limited to 'xlators/performance')
-rw-r--r--xlators/performance/Makefile.am2
-rw-r--r--xlators/performance/md-cache/Makefile.am1
-rw-r--r--xlators/performance/md-cache/src/Makefile.am14
-rw-r--r--xlators/performance/md-cache/src/md-cache-mem-types.h33
-rw-r--r--xlators/performance/md-cache/src/md-cache.c1764
5 files changed, 1813 insertions, 1 deletions
diff --git a/xlators/performance/Makefile.am b/xlators/performance/Makefile.am
index e91d5f6efc8..2fc145e4021 100644
--- a/xlators/performance/Makefile.am
+++ b/xlators/performance/Makefile.am
@@ -1,3 +1,3 @@
-SUBDIRS = write-behind read-ahead io-threads io-cache symlink-cache quick-read stat-prefetch
+SUBDIRS = write-behind read-ahead io-threads io-cache symlink-cache quick-read stat-prefetch md-cache
CLEANFILES =
diff --git a/xlators/performance/md-cache/Makefile.am b/xlators/performance/md-cache/Makefile.am
new file mode 100644
index 00000000000..af437a64d6d
--- /dev/null
+++ b/xlators/performance/md-cache/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = src
diff --git a/xlators/performance/md-cache/src/Makefile.am b/xlators/performance/md-cache/src/Makefile.am
new file mode 100644
index 00000000000..6031c223fa9
--- /dev/null
+++ b/xlators/performance/md-cache/src/Makefile.am
@@ -0,0 +1,14 @@
+xlator_LTLIBRARIES = md-cache.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/performance
+
+md_cache_la_LDFLAGS = -module -avoidversion
+
+md_cache_la_SOURCES = md-cache.c
+md_cache_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+noinst_HEADERS = md-cache-mem-types.h
+
+AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -Wall -D$(GF_HOST_OS) \
+ -I$(top_srcdir)/libglusterfs/src -I$(CONTRIBDIR)/rbtree -shared -nostartfiles $(GF_CFLAGS)
+
+CLEANFILES =
diff --git a/xlators/performance/md-cache/src/md-cache-mem-types.h b/xlators/performance/md-cache/src/md-cache-mem-types.h
new file mode 100644
index 00000000000..f09e882573c
--- /dev/null
+++ b/xlators/performance/md-cache/src/md-cache-mem-types.h
@@ -0,0 +1,33 @@
+/*
+ Copyright (c) 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/>.
+*/
+
+
+#ifndef __MDC_MEM_TYPES_H__
+#define __MDC_MEM_TYPES_H__
+
+#include "mem-types.h"
+
+enum gf_mdc_mem_types_ {
+ gf_mdc_mt_mdc_local_t = gf_common_mt_end + 1,
+ gf_mdc_mt_md_cache_t,
+ gf_mdc_mt_mdc_conf_t,
+ gf_mdc_mt_end
+};
+#endif
+
diff --git a/xlators/performance/md-cache/src/md-cache.c b/xlators/performance/md-cache/src/md-cache.c
new file mode 100644
index 00000000000..dd9a8d6d09a
--- /dev/null
+++ b/xlators/performance/md-cache/src/md-cache.c
@@ -0,0 +1,1764 @@
+/*
+ Copyright (c) 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/>.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "md-cache-mem-types.h"
+#include <assert.h>
+#include <sys/time.h>
+
+
+/* TODO:
+ - cache symlink() link names and nuke symlink-cache
+ - send proper postbuf in setattr_cbk even when op_ret = -1
+*/
+
+
+struct mdc_conf {
+ int timeout;
+};
+
+
+struct mdc_key {
+ const char *name;
+ int load;
+ int check;
+} mdc_keys[] = {
+ {
+ .name = "system.posix_acl_access",
+ .load = 1,
+ .check = 1,
+ },
+ {
+ .name = "system.posix_acl_default",
+ .load = 1,
+ .check = 1,
+ },
+ {
+ .name = "security.selinux",
+ .load = 1,
+ .check = 1,
+ },
+ {
+ .name = "security.capability",
+ .load = 1,
+ .check = 1,
+ },
+ {
+ .name = "gfid-req",
+ .load = 0,
+ .check = 1,
+ },
+ {},
+};
+
+
+static uint64_t
+gfid_to_ino (uuid_t gfid)
+{
+ uint64_t ino = 0;
+ int i = 0, j = 0;
+
+ for (i = 15; i > (15 - 8); i--) {
+ ino += (uint64_t)(gfid[i]) << j;
+ j += 8;
+ }
+
+ return ino;
+}
+
+
+struct mdc_local;
+typedef struct mdc_local mdc_local_t;
+
+#define MDC_STACK_UNWIND(fop, frame, params ...) do { \
+ mdc_local_t *__local = NULL; \
+ xlator_t *__xl = NULL; \
+ if (frame) { \
+ __xl = frame->this; \
+ __local = frame->local; \
+ frame->local = NULL; \
+ } \
+ STACK_UNWIND_STRICT (fop, frame, params); \
+ mdc_local_wipe (__xl, __local); \
+ } while (0)
+
+
+struct md_cache {
+ ia_prot_t md_prot;
+ uint32_t md_nlink;
+ uint32_t md_uid;
+ uint32_t md_gid;
+ uint32_t md_atime;
+ uint32_t md_atime_nsec;
+ uint32_t md_mtime;
+ uint32_t md_mtime_nsec;
+ uint32_t md_ctime;
+ uint32_t md_ctime_nsec;
+ uint64_t md_rdev;
+ uint64_t md_size;
+ uint64_t md_blocks;
+ dict_t *xattr;
+ char *linkname;
+ time_t ia_time;
+ time_t xa_time;
+};
+
+
+struct mdc_local {
+ loc_t loc;
+ loc_t loc2;
+ fd_t *fd;
+ char *linkname;
+ dict_t *xattr;
+};
+
+
+int
+__mdc_inode_ctx_get (xlator_t *this, inode_t *inode, struct md_cache **mdc_p)
+{
+ int ret = 0;
+ struct md_cache *mdc = NULL;
+ uint64_t mdc_int = 0;
+
+ ret = __inode_ctx_get (inode, this, &mdc_int);
+ mdc = (void *) (long) (mdc_int);
+ if (ret == 0 && mdc_p)
+ *mdc_p = mdc;
+
+ return ret;
+}
+
+
+int
+mdc_inode_ctx_get (xlator_t *this, inode_t *inode, struct md_cache **mdc_p)
+{
+ int ret;
+
+ LOCK(&inode->lock);
+ {
+ ret = __mdc_inode_ctx_get (this, inode, mdc_p);
+ }
+ UNLOCK(&inode->lock);
+
+ return ret;
+}
+
+
+int
+__mdc_inode_ctx_set (xlator_t *this, inode_t *inode, struct md_cache *mdc)
+{
+ int ret = 0;
+ uint64_t mdc_int = 0;
+
+ mdc_int = (long) mdc;
+ ret = __inode_ctx_set2 (inode, this, &mdc_int, 0);
+
+ return ret;
+}
+
+
+int
+mdc_inode_ctx_set (xlator_t *this, inode_t *inode, struct md_cache *mdc)
+{
+ int ret;
+
+ LOCK(&inode->lock);
+ {
+ ret = __mdc_inode_ctx_set (this, inode, mdc);
+ }
+ UNLOCK(&inode->lock);
+
+ return ret;
+}
+
+
+mdc_local_t *
+mdc_local_get (call_frame_t *frame)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+ if (local)
+ goto out;
+
+ local = GF_CALLOC (sizeof (*local), 1, gf_mdc_mt_mdc_local_t);
+ if (!local)
+ goto out;
+
+ frame->local = local;
+out:
+ return local;
+}
+
+
+void
+mdc_local_wipe (xlator_t *this, mdc_local_t *local)
+{
+ if (!local)
+ return;
+
+ loc_wipe (&local->loc);
+
+ loc_wipe (&local->loc2);
+
+ if (local->fd)
+ fd_unref (local->fd);
+
+ if (local->linkname)
+ GF_FREE (local->linkname);
+
+ if (local->xattr)
+ dict_unref (local->xattr);
+
+ GF_FREE (local);
+ return;
+}
+
+
+int
+mdc_inode_wipe (xlator_t *this, inode_t *inode)
+{
+ int ret = 0;
+ uint64_t mdc_int = 0;
+ struct md_cache *mdc = NULL;
+
+ ret = inode_ctx_del (inode, this, &mdc_int);
+ if (ret != 0)
+ goto out;
+
+ mdc = (void *) (long) mdc_int;
+
+ if (mdc->xattr)
+ dict_unref (mdc->xattr);
+
+ if (mdc->linkname)
+ GF_FREE (mdc->linkname);
+
+ GF_FREE (mdc);
+
+ ret = 0;
+out:
+ return ret;
+}
+
+
+struct md_cache *
+mdc_inode_prep (xlator_t *this, inode_t *inode)
+{
+ int ret = 0;
+ struct md_cache *mdc = NULL;
+
+ LOCK (&inode->lock);
+ {
+ ret = __mdc_inode_ctx_get (this, inode, &mdc);
+ if (ret == 0)
+ goto unlock;
+
+ mdc = GF_CALLOC (sizeof (*mdc), 1, gf_mdc_mt_md_cache_t);
+ if (!mdc) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "out of memory :(");
+ goto unlock;
+ }
+
+ ret = __mdc_inode_ctx_set (this, inode, mdc);
+ if (ret) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "out of memory :(");
+ GF_FREE (mdc);
+ mdc = NULL;
+ }
+ }
+unlock:
+ UNLOCK (&inode->lock);
+
+ return mdc;
+}
+
+
+static gf_boolean_t
+is_md_cache_iatt_valid (xlator_t *this, struct md_cache *mdc)
+{
+ struct mdc_conf *conf = NULL;
+ time_t now = 0;
+
+ conf = this->private;
+
+ time (&now);
+
+ if (now > (mdc->ia_time + conf->timeout))
+ return _gf_false;
+
+ return _gf_true;
+}
+
+
+static gf_boolean_t
+is_md_cache_xatt_valid (xlator_t *this, struct md_cache *mdc)
+{
+ struct mdc_conf *conf = NULL;
+ time_t now = 0;
+
+ conf = this->private;
+
+ time (&now);
+
+ if (now > (mdc->xa_time + conf->timeout))
+ return _gf_false;
+
+ return _gf_true;
+}
+
+
+void
+mdc_from_iatt (struct md_cache *mdc, struct iatt *iatt)
+{
+ mdc->md_prot = iatt->ia_prot;
+ mdc->md_nlink = iatt->ia_nlink;
+ mdc->md_uid = iatt->ia_uid;
+ mdc->md_gid = iatt->ia_gid;
+ mdc->md_atime = iatt->ia_atime;
+ mdc->md_atime_nsec = iatt->ia_atime_nsec;
+ mdc->md_mtime = iatt->ia_mtime;
+ mdc->md_mtime_nsec = iatt->ia_mtime_nsec;
+ mdc->md_ctime = iatt->ia_ctime;
+ mdc->md_ctime_nsec = iatt->ia_ctime_nsec;
+ mdc->md_rdev = iatt->ia_rdev;
+ mdc->md_size = iatt->ia_size;
+ mdc->md_blocks = iatt->ia_blocks;
+}
+
+
+void
+mdc_to_iatt (struct md_cache *mdc, struct iatt *iatt)
+{
+ iatt->ia_prot = mdc->md_prot;
+ iatt->ia_nlink = mdc->md_nlink;
+ iatt->ia_uid = mdc->md_uid;
+ iatt->ia_gid = mdc->md_gid;
+ iatt->ia_atime = mdc->md_atime;
+ iatt->ia_atime_nsec = mdc->md_atime_nsec;
+ iatt->ia_mtime = mdc->md_mtime;
+ iatt->ia_mtime_nsec = mdc->md_mtime_nsec;
+ iatt->ia_ctime = mdc->md_ctime;
+ iatt->ia_ctime_nsec = mdc->md_ctime_nsec;
+ iatt->ia_rdev = mdc->md_rdev;
+ iatt->ia_size = mdc->md_size;
+ iatt->ia_blocks = mdc->md_blocks;
+}
+
+
+int
+mdc_inode_iatt_set (xlator_t *this, inode_t *inode, struct iatt *iatt)
+{
+ int ret = -1;
+ struct md_cache *mdc = NULL;
+
+ mdc = mdc_inode_prep (this, inode);
+ if (!mdc)
+ goto out;
+
+ if (!iatt || !iatt->ia_ctime) {
+ mdc->ia_time = 0;
+ return 0;
+ }
+
+ mdc_from_iatt (mdc, iatt);
+
+ time (&mdc->ia_time);
+
+ ret = 0;
+out:
+ return ret;
+}
+
+
+int
+mdc_inode_iatt_get (xlator_t *this, inode_t *inode, struct iatt *iatt)
+{
+ int ret = -1;
+ struct md_cache *mdc = NULL;
+
+ if (mdc_inode_ctx_get (this, inode, &mdc) != 0)
+ goto out;
+
+ if (!is_md_cache_iatt_valid (this, mdc))
+ goto out;
+
+ mdc_to_iatt (mdc, iatt);
+
+ uuid_copy (iatt->ia_gfid, inode->gfid);
+ iatt->ia_ino = gfid_to_ino (inode->gfid);
+ iatt->ia_dev = 42;
+ iatt->ia_type = inode->ia_type;
+
+ ret = 0;
+out:
+ return ret;
+}
+
+
+int
+mdc_inode_xatt_set (xlator_t *this, inode_t *inode, dict_t *dict)
+{
+ int ret = -1;
+ struct md_cache *mdc = NULL;
+
+ mdc = mdc_inode_prep (this, inode);
+ if (!mdc)
+ goto out;
+
+ if (!dict)
+ goto out;
+
+ if (mdc->xattr)
+ dict_unref (mdc->xattr);
+
+ mdc->xattr = dict_ref (dict);
+
+ time (&mdc->xa_time);
+
+ ret = 0;
+out:
+ return ret;
+}
+
+
+int
+mdc_inode_xatt_update (xlator_t *this, inode_t *inode, dict_t *dict)
+{
+ int ret = -1;
+ struct md_cache *mdc = NULL;
+
+ mdc = mdc_inode_prep (this, inode);
+ if (!mdc)
+ goto out;
+
+ if (!dict)
+ goto out;
+
+ if (!mdc->xattr)
+ mdc->xattr = dict_ref (dict);
+ else
+ dict_copy (dict, mdc->xattr);
+
+ mdc->xattr = dict_ref (dict);
+
+ time (&mdc->xa_time);
+
+ ret = 0;
+out:
+ return ret;
+}
+
+
+int
+mdc_inode_xatt_get (xlator_t *this, inode_t *inode, dict_t **dict)
+{
+ int ret = -1;
+ struct md_cache *mdc = NULL;
+
+ if (mdc_inode_ctx_get (this, inode, &mdc) != 0)
+ goto out;
+
+ if (!is_md_cache_xatt_valid (this, mdc))
+ goto out;
+
+ if (!mdc->xattr)
+ goto out;
+
+ if (dict)
+ *dict = dict_ref (mdc->xattr);
+
+ ret = 0;
+out:
+ return ret;
+}
+
+
+void
+mdc_load_reqs (xlator_t *this, dict_t *dict)
+{
+ const char *mdc_key = NULL;
+ int i = 0;
+ int ret = 0;
+
+ for (mdc_key = mdc_keys[i].name; (mdc_key = mdc_keys[i].name); i++) {
+ if (!mdc_keys[i].load)
+ continue;
+ ret = dict_set_int8 (dict, (char *)mdc_key, 0);
+ if (ret)
+ return;
+ }
+}
+
+
+struct checkpair {
+ int ret;
+ dict_t *rsp;
+};
+
+
+static int
+is_mdc_key_satisfied (const char *key)
+{
+ const char *mdc_key = NULL;
+ int i = 0;
+
+ if (!key)
+ return 0;
+
+ for (mdc_key = mdc_keys[i].name; (mdc_key = mdc_keys[i].name); i++) {
+ if (!mdc_keys[i].check)
+ continue;
+ if (strcmp (mdc_key, key) == 0)
+ return 1;
+ }
+
+ return 0;
+}
+
+
+static void
+checkfn (dict_t *this, char *key, data_t *value, void *data)
+{
+ struct checkpair *pair = data;
+
+ if (!is_mdc_key_satisfied (key))
+ pair->ret = 0;
+}
+
+
+int
+mdc_xattr_satisfied (xlator_t *this, dict_t *req, dict_t *rsp)
+{
+ struct checkpair pair = {
+ .ret = 1,
+ .rsp = rsp,
+ };
+
+ dict_foreach (req, checkfn, &pair);
+
+ return pair.ret;
+}
+
+
+int
+mdc_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, inode_t *inode,
+ struct iatt *stbuf, dict_t *dict, struct iatt *postparent)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ if (local->loc.parent) {
+ mdc_inode_iatt_set (this, local->loc.parent, postparent);
+ }
+
+ if (local->loc.inode) {
+ mdc_inode_iatt_set (this, local->loc.inode, stbuf);
+ mdc_inode_xatt_set (this, local->loc.inode, dict);
+ }
+out:
+ MDC_STACK_UNWIND (lookup, frame, op_ret, op_errno, inode, stbuf,
+ dict, postparent);
+ return 0;
+}
+
+
+int
+mdc_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc,
+ dict_t *xattr_req)
+{
+ int ret = 0;
+ struct iatt stbuf = {0, };
+ struct iatt postparent = {0, };
+ dict_t *xattr_rsp = NULL;
+ mdc_local_t *local = NULL;
+
+
+ local = mdc_local_get (frame);
+ if (!local)
+ goto uncached;
+
+ loc_copy (&local->loc, loc);
+
+ ret = mdc_inode_iatt_get (this, loc->inode, &stbuf);
+ if (ret != 0)
+ goto uncached;
+
+ if (xattr_req) {
+ ret = mdc_inode_xatt_get (this, loc->inode, &xattr_rsp);
+ if (ret != 0)
+ goto uncached;
+
+ if (!mdc_xattr_satisfied (this, xattr_req, xattr_rsp))
+ goto uncached;
+ }
+
+ MDC_STACK_UNWIND (lookup, frame, 0, 0, loc->inode, &stbuf,
+ xattr_rsp, &postparent);
+
+ if (xattr_rsp)
+ dict_unref (xattr_rsp);
+
+ return 0;
+
+uncached:
+ if (xattr_req)
+ mdc_load_reqs (this, xattr_req);
+
+ STACK_WIND (frame, mdc_lookup_cbk, FIRST_CHILD (this),
+ FIRST_CHILD (this)->fops->lookup, loc, xattr_req);
+
+ if (xattr_rsp)
+ dict_unref (xattr_rsp);
+
+ return 0;
+}
+
+
+int
+mdc_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, struct iatt *buf)
+{
+ mdc_local_t *local = NULL;
+
+ if (op_ret != 0)
+ goto out;
+
+ local = frame->local;
+ if (!local)
+ goto out;
+
+ mdc_inode_iatt_set (this, local->loc.inode, buf);
+
+out:
+ MDC_STACK_UNWIND (stat, frame, op_ret, op_errno, buf);
+
+ return 0;
+}
+
+
+int
+mdc_stat (call_frame_t *frame, xlator_t *this, loc_t *loc)
+{
+ int ret;
+ struct iatt stbuf;
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+ if (!local)
+ goto uncached;
+
+ loc_copy (&local->loc, loc);
+
+ ret = mdc_inode_iatt_get (this, loc->inode, &stbuf);
+ if (ret != 0)
+ goto uncached;
+
+ MDC_STACK_UNWIND (stat, frame, 0, 0, &stbuf);
+
+ return 0;
+
+uncached:
+ STACK_WIND (frame, mdc_stat_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->stat,
+ loc);
+ return 0;
+}
+
+
+int
+mdc_fstat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, struct iatt *buf)
+{
+ mdc_local_t *local = NULL;
+
+ if (op_ret != 0)
+ goto out;
+
+ local = frame->local;
+ if (!local)
+ goto out;
+
+ mdc_inode_iatt_set (this, local->fd->inode, buf);
+
+out:
+ MDC_STACK_UNWIND (fstat, frame, op_ret, op_errno, buf);
+
+ return 0;
+}
+
+
+int
+mdc_fstat (call_frame_t *frame, xlator_t *this, fd_t *fd)
+{
+ int ret;
+ struct iatt stbuf;
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+ if (!local)
+ goto uncached;
+
+ local->fd = fd_ref (fd);
+
+ ret = mdc_inode_iatt_get (this, fd->inode, &stbuf);
+ if (ret != 0)
+ goto uncached;
+
+ MDC_STACK_UNWIND (fstat, frame, 0, 0, &stbuf);
+
+ return 0;
+
+uncached:
+ STACK_WIND (frame, mdc_fstat_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->fstat,
+ fd);
+ return 0;
+}
+
+
+int
+mdc_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *prebuf, struct iatt *postbuf)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ mdc_inode_iatt_set (this, local->loc.inode, postbuf);
+
+out:
+ MDC_STACK_UNWIND (truncate, frame, op_ret, op_errno, prebuf, postbuf);
+
+ return 0;
+}
+
+
+int
+mdc_truncate (call_frame_t *frame, xlator_t *this, loc_t *loc,
+ off_t offset)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ local->loc.inode = inode_ref (loc->inode);
+
+ STACK_WIND (frame, mdc_truncate_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->truncate,
+ loc, offset);
+ return 0;
+}
+
+
+int
+mdc_ftruncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *prebuf, struct iatt *postbuf)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ mdc_inode_iatt_set (this, local->fd->inode, postbuf);
+
+out:
+ MDC_STACK_UNWIND (ftruncate, frame, op_ret, op_errno, prebuf, postbuf);
+
+ return 0;
+}
+
+
+int
+mdc_ftruncate (call_frame_t *frame, xlator_t *this, fd_t *fd,
+ off_t offset)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ local->fd = fd_ref (fd);
+
+ STACK_WIND (frame, mdc_ftruncate_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->ftruncate,
+ fd, offset);
+ return 0;
+}
+
+
+int
+mdc_mknod_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, inode_t *inode,
+ struct iatt *buf, struct iatt *preparent, struct iatt *postparent)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ if (local->loc.parent) {
+ mdc_inode_iatt_set (this, local->loc.parent, postparent);
+ }
+
+ if (local->loc.inode) {
+ mdc_inode_iatt_set (this, local->loc.inode, buf);
+ mdc_inode_xatt_set (this, local->loc.inode, local->xattr);
+ }
+out:
+ MDC_STACK_UNWIND (mknod, frame, op_ret, op_errno, inode, buf,
+ preparent, postparent);
+ return 0;
+}
+
+
+int
+mdc_mknod (call_frame_t *frame, xlator_t *this, loc_t *loc,
+ mode_t mode, dev_t rdev, dict_t *params)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, loc);
+ local->xattr = dict_ref (params);
+
+ STACK_WIND (frame, mdc_mknod_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->mknod,
+ loc, mode, rdev, params);
+ return 0;
+}
+
+
+int
+mdc_mkdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, inode_t *inode,
+ struct iatt *buf, struct iatt *preparent, struct iatt *postparent)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ if (local->loc.parent) {
+ mdc_inode_iatt_set (this, local->loc.parent, postparent);
+ }
+
+ if (local->loc.inode) {
+ mdc_inode_iatt_set (this, local->loc.inode, buf);
+ mdc_inode_xatt_set (this, local->loc.inode, local->xattr);
+ }
+out:
+ MDC_STACK_UNWIND (mkdir, frame, op_ret, op_errno, inode, buf,
+ preparent, postparent);
+ return 0;
+}
+
+
+int
+mdc_mkdir (call_frame_t *frame, xlator_t *this, loc_t *loc,
+ mode_t mode, dict_t *params)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, loc);
+ local->xattr = dict_ref (params);
+
+ STACK_WIND (frame, mdc_mkdir_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->mkdir,
+ loc, mode, params);
+ return 0;
+}
+
+
+int
+mdc_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *preparent, struct iatt *postparent)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ if (local->loc.parent) {
+ mdc_inode_iatt_set (this, local->loc.parent, postparent);
+ }
+
+ if (local->loc.inode) {
+ mdc_inode_iatt_set (this, local->loc.inode, NULL);
+ }
+
+out:
+ MDC_STACK_UNWIND (unlink, frame, op_ret, op_errno,
+ preparent, postparent);
+ return 0;
+}
+
+
+int
+mdc_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, loc);
+
+ STACK_WIND (frame, mdc_unlink_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->unlink,
+ loc);
+ return 0;
+}
+
+
+int
+mdc_rmdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *preparent, struct iatt *postparent)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ if (local->loc.parent) {
+ mdc_inode_iatt_set (this, local->loc.parent, postparent);
+ }
+
+out:
+ MDC_STACK_UNWIND (rmdir, frame, op_ret, op_errno,
+ preparent, postparent);
+ return 0;
+}
+
+
+int
+mdc_rmdir (call_frame_t *frame, xlator_t *this, loc_t *loc, int flag)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, loc);
+
+ STACK_WIND (frame, mdc_rmdir_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->rmdir,
+ loc, flag);
+ return 0;
+}
+
+
+int
+mdc_symlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, inode_t *inode,
+ struct iatt *buf, struct iatt *preparent, struct iatt *postparent)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ if (local->loc.parent) {
+ mdc_inode_iatt_set (this, local->loc.parent, postparent);
+ }
+
+ if (local->loc.inode) {
+ mdc_inode_iatt_set (this, local->loc.inode, buf);
+ }
+out:
+ MDC_STACK_UNWIND (symlink, frame, op_ret, op_errno, inode, buf,
+ preparent, postparent);
+ return 0;
+}
+
+
+int
+mdc_symlink (call_frame_t *frame, xlator_t *this, const char *linkname,
+ loc_t *loc, dict_t *params)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, loc);
+
+ local->linkname = strdup (linkname);
+
+ STACK_WIND (frame, mdc_symlink_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->symlink,
+ linkname, loc, params);
+ return 0;
+}
+
+
+int
+mdc_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, struct iatt *buf,
+ struct iatt *preoldparent, struct iatt *postoldparent,
+ struct iatt *prenewparent, struct iatt *postnewparent)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ if (local->loc.parent) {
+ mdc_inode_iatt_set (this, local->loc.parent, postoldparent);
+ }
+
+ if (local->loc.inode) {
+ /* TODO: fix dht_rename() not to return linkfile
+ attributes before setting attributes here
+ */
+
+ mdc_inode_iatt_set (this, local->loc.inode, NULL);
+ }
+
+ if (local->loc2.parent) {
+ mdc_inode_iatt_set (this, local->loc2.parent, postnewparent);
+ }
+out:
+ MDC_STACK_UNWIND (rename, frame, op_ret, op_errno, buf,
+ preoldparent, postoldparent, prenewparent, postnewparent);
+ return 0;
+}
+
+
+int
+mdc_rename (call_frame_t *frame, xlator_t *this,
+ loc_t *oldloc, loc_t *newloc)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, oldloc);
+ loc_copy (&local->loc2, newloc);
+
+ STACK_WIND (frame, mdc_rename_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->rename,
+ oldloc, newloc);
+ return 0;
+}
+
+
+int
+mdc_link_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, inode_t *inode, struct iatt *buf,
+ struct iatt *preparent, struct iatt *postparent)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ if (local->loc.inode) {
+ mdc_inode_iatt_set (this, local->loc.inode, buf);
+ }
+
+ if (local->loc2.parent) {
+ mdc_inode_iatt_set (this, local->loc2.parent, postparent);
+ }
+out:
+ MDC_STACK_UNWIND (link, frame, op_ret, op_errno, inode, buf,
+ preparent, postparent);
+ return 0;
+}
+
+
+int
+mdc_link (call_frame_t *frame, xlator_t *this,
+ loc_t *oldloc, loc_t *newloc)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, oldloc);
+ loc_copy (&local->loc2, newloc);
+
+ STACK_WIND (frame, mdc_link_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->link,
+ oldloc, newloc);
+ return 0;
+}
+
+
+int
+mdc_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, fd_t *fd, inode_t *inode,
+ struct iatt *buf, struct iatt *preparent, struct iatt *postparent)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ if (local->loc.parent) {
+ mdc_inode_iatt_set (this, local->loc.parent, postparent);
+ }
+
+ if (local->loc.inode) {
+ mdc_inode_iatt_set (this, inode, buf);
+ mdc_inode_xatt_set (this, local->loc.inode, local->xattr);
+ }
+out:
+ MDC_STACK_UNWIND (create, frame, op_ret, op_errno, fd, inode, buf,
+ preparent, postparent);
+ return 0;
+}
+
+
+int
+mdc_create (call_frame_t *frame, xlator_t *this, loc_t *loc, int flags,
+ mode_t mode, fd_t *fd, dict_t *params)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, loc);
+ local->xattr = dict_ref (params);
+
+ STACK_WIND (frame, mdc_create_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->create,
+ loc, flags, mode, fd, params);
+ return 0;
+}
+
+
+int
+mdc_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iovec *vector, int32_t count,
+ struct iatt *stbuf, struct iobref *iobref)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ mdc_inode_iatt_set (this, local->fd->inode, stbuf);
+
+out:
+ MDC_STACK_UNWIND (readv, frame, op_ret, op_errno, vector, count,
+ stbuf, iobref);
+
+ return 0;
+}
+
+
+int
+mdc_readv (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+ off_t offset, uint32_t flags)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ local->fd = fd_ref (fd);
+
+ STACK_WIND (frame, mdc_readv_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->readv,
+ fd, size, offset, flags);
+ return 0;
+}
+
+
+int
+mdc_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *prebuf, struct iatt *postbuf)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret == -1)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ mdc_inode_iatt_set (this, local->fd->inode, postbuf);
+
+out:
+ MDC_STACK_UNWIND (writev, frame, op_ret, op_errno, prebuf, postbuf);
+
+ return 0;
+}
+
+
+int
+mdc_writev (call_frame_t *frame, xlator_t *this, fd_t *fd, struct iovec *vector,
+ int count, off_t offset, uint32_t flags, struct iobref *iobref)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ local->fd = fd_ref (fd);
+
+ STACK_WIND (frame, mdc_writev_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->writev,
+ fd, vector, count, offset, flags, iobref);
+ return 0;
+}
+
+
+int
+mdc_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *prebuf, struct iatt *postbuf)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0) {
+ mdc_inode_iatt_set (this, local->loc.inode, NULL);
+ goto out;
+ }
+
+ if (!local)
+ goto out;
+
+ mdc_inode_iatt_set (this, local->loc.inode, postbuf);
+
+out:
+ MDC_STACK_UNWIND (setattr, frame, op_ret, op_errno, prebuf, postbuf);
+
+ return 0;
+}
+
+
+int
+mdc_setattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+ struct iatt *stbuf, int valid)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, loc);
+
+ STACK_WIND (frame, mdc_setattr_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->setattr,
+ loc, stbuf, valid);
+ return 0;
+}
+
+
+int
+mdc_fsetattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *prebuf, struct iatt *postbuf)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ mdc_inode_iatt_set (this, local->fd->inode, postbuf);
+
+out:
+ MDC_STACK_UNWIND (fsetattr, frame, op_ret, op_errno, prebuf, postbuf);
+
+ return 0;
+}
+
+
+int
+mdc_fsetattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+ struct iatt *stbuf, int valid)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ local->fd = fd_ref (fd);
+
+ STACK_WIND (frame, mdc_setattr_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->fsetattr,
+ fd, stbuf, valid);
+ return 0;
+}
+
+
+int
+mdc_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *prebuf, struct iatt *postbuf)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ mdc_inode_iatt_set (this, local->fd->inode, postbuf);
+
+out:
+ MDC_STACK_UNWIND (fsync, frame, op_ret, op_errno, prebuf, postbuf);
+
+ return 0;
+}
+
+
+int
+mdc_fsync (call_frame_t *frame, xlator_t *this, fd_t *fd, int datasync)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ local->fd = fd_ref (fd);
+
+ STACK_WIND (frame, mdc_fsync_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->fsync,
+ fd, datasync);
+ return 0;
+}
+
+
+int
+mdc_setxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ mdc_inode_xatt_update (this, local->loc.inode, local->xattr);
+
+out:
+ MDC_STACK_UNWIND (setxattr, frame, op_ret, op_errno);
+
+ return 0;
+}
+
+
+int
+mdc_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+ dict_t *xattr, int flags)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ loc_copy (&local->loc, loc);
+ local->xattr = dict_ref (xattr);
+
+ STACK_WIND (frame, mdc_setxattr_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->setxattr,
+ loc, xattr, flags);
+ return 0;
+}
+
+
+int
+mdc_fsetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno)
+{
+ mdc_local_t *local = NULL;
+
+ local = frame->local;
+
+ if (op_ret != 0)
+ goto out;
+
+ if (!local)
+ goto out;
+
+ mdc_inode_xatt_update (this, local->fd->inode, local->xattr);
+
+out:
+ MDC_STACK_UNWIND (fsetxattr, frame, op_ret, op_errno);
+
+ return 0;
+}
+
+
+int
+mdc_fsetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+ dict_t *xattr, int flags)
+{
+ mdc_local_t *local = NULL;
+
+ local = mdc_local_get (frame);
+
+ local->fd = fd_ref (fd);
+ local->xattr = dict_ref (xattr);
+
+ STACK_WIND (frame, mdc_fsetxattr_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->fsetxattr,
+ fd, xattr, flags);
+ return 0;
+}
+
+int
+mdc_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, dict_t *xattr)
+{
+ mdc_local_t *local = NULL;
+
+ if (op_ret != 0)
+ goto out;
+
+ local = frame->local;
+ if (!local)
+ goto out;
+
+ mdc_inode_xatt_update (this, local->loc.inode, xattr);
+
+out:
+ MDC_STACK_UNWIND (getxattr, frame, op_ret, op_errno, xattr);
+
+ return 0;
+}
+
+
+int
+mdc_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, const char *key)
+{
+ int ret;
+ mdc_local_t *local = NULL;
+ dict_t *xattr = NULL;
+
+ local = mdc_local_get (frame);
+ if (!local)
+ goto uncached;
+
+ loc_copy (&local->loc, loc);
+
+ if (!is_mdc_key_satisfied (key))
+ goto uncached;
+
+ ret = mdc_inode_xatt_get (this, loc->inode, &xattr);
+ if (ret != 0)
+ goto uncached;
+
+ if (!dict_get (xattr, (char *)key))
+ goto uncached;
+
+ MDC_STACK_UNWIND (getxattr, frame, 0, 0, xattr);
+
+ return 0;
+
+uncached:
+ STACK_WIND (frame, mdc_getxattr_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->getxattr,
+ loc, key);
+ return 0;
+}
+
+
+int
+mdc_fgetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, dict_t *xattr)
+{
+ mdc_local_t *local = NULL;
+
+ if (op_ret != 0)
+ goto out;
+
+ local = frame->local;
+ if (!local)
+ goto out;
+
+ mdc_inode_xatt_update (this, local->fd->inode, xattr);
+
+out:
+ MDC_STACK_UNWIND (fgetxattr, frame, op_ret, op_errno, xattr);
+
+ return 0;
+}
+
+
+int
+mdc_fgetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd, const char *key)
+{
+ int ret;
+ mdc_local_t *local = NULL;
+ dict_t *xattr = NULL;
+
+ local = mdc_local_get (frame);
+ if (!local)
+ goto uncached;
+
+ local->fd = fd_ref (fd);
+
+ if (!is_mdc_key_satisfied (key))
+ goto uncached;
+
+ ret = mdc_inode_xatt_get (this, fd->inode, &xattr);
+ if (ret != 0)
+ goto uncached;
+
+ if (!dict_get (xattr, (char *)key))
+ goto uncached;
+
+ MDC_STACK_UNWIND (fgetxattr, frame, 0, 0, xattr);
+
+ return 0;
+
+uncached:
+ STACK_WIND (frame, mdc_fgetxattr_cbk,
+ FIRST_CHILD(this), FIRST_CHILD(this)->fops->fgetxattr,
+ fd, key);
+ return 0;
+}
+
+
+int
+mdc_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int op_ret, int op_errno, gf_dirent_t *entries)
+{
+ gf_dirent_t *entry = NULL;
+
+ if (op_ret <= 0)
+ goto unwind;
+
+ list_for_each_entry (entry, &entries->list, list) {
+ if (!entry->inode)
+ continue;
+ mdc_inode_iatt_set (this, entry->inode, &entry->d_stat);
+ mdc_inode_xatt_set (this, entry->inode, entry->dict);
+ }
+
+unwind:
+ STACK_UNWIND_STRICT (readdirp, frame, op_ret, op_errno, entries);
+ return 0;
+}
+
+
+int
+mdc_readdirp (call_frame_t *frame, xlator_t *this, fd_t *fd,
+ size_t size, off_t offset, dict_t *xattr_req)
+{
+ STACK_WIND (frame, mdc_readdirp_cbk,
+ FIRST_CHILD (this), FIRST_CHILD (this)->fops->readdirp,
+ fd, size, offset, xattr_req);
+ return 0;
+}
+
+
+int
+mdc_readdir (call_frame_t *frame, xlator_t *this, fd_t *fd,
+ size_t size, off_t offset)
+{
+ dict_t *xattr_req = NULL;
+
+ xattr_req = dict_new ();
+
+ if (xattr_req) {
+ mdc_load_reqs (this, xattr_req);
+ }
+
+ STACK_WIND (frame, mdc_readdirp_cbk,
+ FIRST_CHILD (this), FIRST_CHILD (this)->fops->readdirp,
+ fd, size, offset, xattr_req);
+ return 0;
+}
+
+
+int
+mdc_forget (xlator_t *this, inode_t *inode)
+{
+ mdc_inode_wipe (this, inode);
+
+ return 0;
+}
+
+
+int
+reconfigure (xlator_t *this, dict_t *options)
+{
+ struct mdc_conf *conf = NULL;
+
+ conf = this->private;
+
+ GF_OPTION_RECONF ("timeout", conf->timeout, options, int32, out);
+out:
+ return 0;
+}
+
+
+int
+init (xlator_t *this)
+{
+ struct mdc_conf *conf = NULL;
+
+ conf = GF_CALLOC (sizeof (*conf), 1, gf_mdc_mt_mdc_conf_t);
+ if (!conf) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "out of memory");
+ return -1;
+ }
+
+ GF_OPTION_INIT ("timeout", conf->timeout, int32, out);
+
+out:
+ this->private = conf;
+
+ return 0;
+}
+
+
+void
+fini (xlator_t *this)
+{
+ return;
+}
+
+
+struct xlator_fops fops = {
+ .lookup = mdc_lookup,
+ .stat = mdc_stat,
+ .fstat = mdc_fstat,
+ .truncate = mdc_truncate,
+ .ftruncate = mdc_ftruncate,
+ .mknod = mdc_mknod,
+ .mkdir = mdc_mkdir,
+ .unlink = mdc_unlink,
+ .rmdir = mdc_rmdir,
+ .symlink = mdc_symlink,
+ .rename = mdc_rename,
+ .link = mdc_link,
+ .create = mdc_create,
+ .readv = mdc_readv,
+ .writev = mdc_writev,
+ .setattr = mdc_setattr,
+ .fsetattr = mdc_fsetattr,
+ .fsync = mdc_fsync,
+ .setxattr = mdc_setxattr,
+ .fsetxattr = mdc_fsetxattr,
+ .getxattr = mdc_getxattr,
+ .fgetxattr = mdc_fgetxattr,
+ .readdirp = mdc_readdirp,
+ .readdir = mdc_readdir
+};
+
+
+struct xlator_cbks cbks = {
+ .forget = mdc_forget,
+};
+
+struct volume_options options[] = {
+ { .key = {"timeout"},
+ .type = GF_OPTION_TYPE_INT,
+ .min = 0,
+ .max = 60,
+ .default_value = "1",
+ .description = "Time period after which cache has to be refreshed",
+ },
+};