tools/setgfid2path: Tool to set GFID to Path xattr in brick backend

Once storage/gfid2path feature is enabled using `gluster volume set
<volname> storage.gfid2path enable`, it starts recording the gfid2path
xattr on each files. But this feature will not add xattr to the existing
files.

This tool accepts the file path as argument and sets the necessary xattr
required for this feature.

> Reviewed-on: https://review.gluster.org/17839
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Niels de Vos <ndevos@redhat.com>
> Reviewed-by: Kotresh HR <khiremat@redhat.com>
> Tested-by: Kotresh HR <khiremat@redhat.com>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
>  (cherry picked from commit 1ae254ddcf397b101d291342272e13af25b0b1a1)

Change-Id: I75ad82c86ce482950645e687ff2e33b413fa53da
Updates: #139
Signed-off-by: Aravinda VK <avishwan@redhat.com>
Reviewed-on: https://review.gluster.org/17914
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Kotresh HR <khiremat@redhat.com>
Smoke: Gluster Build System <jenkins@build.gluster.org>

9 files changed, 232 insertions, 4 deletions

diff --git a/.gitignore b/.gitignore
index cc4399dfef3..ccda5aa8783 100644
--- a/.gitignore
+++ b/.gitignore
@@ -121,3 +121,4 @@ libglusterfs/src/eventtypes.h
 extras/init.d/glustereventsd-Debian
 extras/init.d/glustereventsd-FreeBSD
 extras/init.d/glustereventsd-Redhat
+tools/setgfid2path/src/gluster-setgfid2path
diff --git a/configure.ac b/configure.ac
index b1593b30a02..413d071c1db 100644
--- a/configure.ac
+++ b/configure.ac
@@ -282,6 +282,8 @@ AC_CONFIG_FILES([Makefile
 	        tools/glusterfind/glusterfind
 	        tools/glusterfind/Makefile
                 tools/glusterfind/src/Makefile
+                tools/setgfid2path/Makefile
+                tools/setgfid2path/src/Makefile
                 tests/basic/fuse/Makefile
                 tests/basic/gfapi/Makefile])
 
diff --git a/glusterfs.spec.in b/glusterfs.spec.in
index d9730f0821d..f26611bf845 100644
--- a/glusterfs.spec.in
+++ b/glusterfs.spec.in
@@ -1223,10 +1223,14 @@ exit 0
 %{_sbindir}/glusterd
 %{_sbindir}/glfsheal
 %{_sbindir}/gf_attach
+%{_sbindir}/gluster-setgfid2path
 # {_sbindir}/glusterfsd is the actual binary, but glusterfs (client) is a
 # symlink. The binary itself (and symlink) are part of the glusterfs-fuse
 # package, because glusterfs-server depends on that anyway.
 
+# Manpages
+%{_mandir}/man8/gluster-setgfid2path.8*
+
 # xlators
      %{_libdir}/libposix2common.so
 %dir %{_libdir}/glusterfs/%{version}%{?prereltag}/xlator
@@ -1369,6 +1373,9 @@ exit 0
 %endif
 
 %changelog
+* Thu Jul 20 2017 Aravinda VK <avishwan@redhat.com>
+- Added new tool/binary to set the gfid2path xattr on files
+
 * Thu Jul 13 2017 Kaleb S. KEITHLEY <kkeithle@redhat.com>
 - various directories not owned by any package
 
diff --git a/tests/gfid2path/gfid2path_fuse.t b/tests/gfid2path/gfid2path_fuse.t
index 38798cf60d0..a66ab183683 100644
--- a/tests/gfid2path/gfid2path_fuse.t
+++ b/tests/gfid2path/gfid2path_fuse.t
@@ -3,6 +3,8 @@
 . $(dirname $0)/../include.rc
 . $(dirname $0)/../volume.rc
 
+CLI_SETGFID2PATH="gluster-setgfid2path";
+
 cleanup;
 
 XXHSUM_SOURCE="$(dirname $0)/../../contrib/xxhash/xxhsum.c $(dirname $0)/../../contrib/xxhash/xxhash.c"
@@ -25,15 +27,30 @@ EXPECT '1' brick_count $V0
 TEST $CLI volume start $V0;
 EXPECT 'Started' volinfo_field $V0 'Status';
 
-## enable gfid2path
-TEST $CLI volume set $V0 gfid2path enable
-
 ## Mount the volume
 TEST $GFS --volfile-server=$H0 --volfile-id=$V0 $M0;
 
 pgfid="00000000-0000-0000-0000-000000000001"
 xxh64_file=$B0/${V0}1/xxh64_file
 
+# Create a file before enabling gfid2path
+fname=$M0/before_file1
+touch $fname;
+backpath=$B0/${V0}1/before_file1
+
+# Set gfid2path xattr
+TEST $CLI_SETGFID2PATH $backpath
+
+#Check for the presence of xattr
+pgfid_bname=$pgfid/before_file1
+echo -n $pgfid_bname > $xxh64_file
+xxh64sum=$($XXHSUM_EXEC $xxh64_file | awk '{print $1}')
+key="trusted.gfid2path.$xxh64sum"
+EXPECT $pgfid_bname get_text_xattr $key $backpath
+
+## enable gfid2path
+TEST $CLI volume set $V0 gfid2path enable
+
 #CREATE
 fname=$M0/file1
 touch $fname;
diff --git a/tools/Makefile.am b/tools/Makefile.am
index d689f60fa52..5808a3728cd 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -1,3 +1,3 @@
-SUBDIRS = gfind_missing_files glusterfind
+SUBDIRS = gfind_missing_files glusterfind setgfid2path
 
 CLEANFILES =
diff --git a/tools/setgfid2path/Makefile.am b/tools/setgfid2path/Makefile.am
new file mode 100644
index 00000000000..c14787a80ce
--- /dev/null
+++ b/tools/setgfid2path/Makefile.am
@@ -0,0 +1,5 @@
+SUBDIRS = src
+
+EXTRA_DIST = gluster-setgfid2path.8
+
+man8_MANS = gluster-setgfid2path.8
diff --git a/tools/setgfid2path/gluster-setgfid2path.8 b/tools/setgfid2path/gluster-setgfid2path.8
new file mode 100644
index 00000000000..2e228ca8514
--- /dev/null
+++ b/tools/setgfid2path/gluster-setgfid2path.8
@@ -0,0 +1,54 @@
+
+.\"  Copyright (c) 2017 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.
+.\"
+.\"
+.TH gluster-setgfid2path 8 "Command line utility to set GFID to Path Xattrs"
+.SH NAME
+gluster-setgfid2path - Gluster tool to set GFID to Path xattrs
+.SH SYNOPSIS
+.B gluster-setgfid2path
+.IR file
+.SH DESCRIPTION
+New feature introduced with Gluster release 3.12, to find full path from GFID.
+This feature can be enabled using Volume set command \fBgluster volume set
+<VOLUME> storage.gfid2path enable\fR
+.PP
+Once \fBgfid2path\fR feature is enabled, it starts recording the necessary
+xattrs required for the feature. But it will not add xattrs for the already
+existing files. This tool provides facility to update the gfid2path xattrs for
+the given file path.
+
+.SH EXAMPLES
+To add xattrs of a single file,
+.PP
+.nf
+.RS
+gluster-setgfid2path /bricks/b1/hello.txt
+.RE
+.fi
+.PP
+To set xattr for all the existing files, run the below script on each bricks.
+.PP
+.nf
+.RS
+BRICK=/bricks/b1
+find $BRICK -type d \\( -path "${BRICK}/.trashcan" -o -path \\
+    "${BRICK}/.glusterfs" \\) -prune -o -type f \\
+    -exec gluster-setgfid2path {} \\;
+.RE
+.fi
+.PP
+.SH SEE ALSO
+.nf
+\fBgluster\fR(8)
+\fR
+.fi
+.SH COPYRIGHT
+.nf
+Copyright(c) 2017   Red Hat, Inc.   <http://www.redhat.com>
diff --git a/tools/setgfid2path/src/Makefile.am b/tools/setgfid2path/src/Makefile.am
new file mode 100644
index 00000000000..45520cadafb
--- /dev/null
+++ b/tools/setgfid2path/src/Makefile.am
@@ -0,0 +1,14 @@
+gluster_setgfid2pathdir = $(sbindir)
+
+gluster_setgfid2path_PROGRAMS = gluster-setgfid2path
+
+gluster_setgfid2path_SOURCES = main.c
+
+gluster_setgfid2path_LDADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+gluster_setgfid2path_LDFLAGS = $(GF_LDFLAGS)
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src \
+	-I$(top_builddir)/rpc/xdr/src
+
+AM_CFLAGS = -Wall $(GF_CFLAGS)
diff --git a/tools/setgfid2path/src/main.c b/tools/setgfid2path/src/main.c
new file mode 100644
index 00000000000..07d7a48b15d
--- /dev/null
+++ b/tools/setgfid2path/src/main.c
@@ -0,0 +1,128 @@
+/*
+   Copyright (c) 2017 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 <stdio.h>
+#include <libgen.h>
+
+#include "common-utils.h"
+#include "syscall.h"
+
+#define MAX_GFID2PATH_LINK_SUP 500
+#define GFID_SIZE 16
+#define GFID_XATTR_KEY "trusted.gfid"
+
+
+int main(int argc, char **argv)
+{
+        int             ret                               = 0;
+        struct stat     st;
+        char           *dname                             = NULL;
+        char           *bname                             = NULL;
+        ssize_t         ret_size                          = 0;
+        uuid_t          pgfid_raw                         = {0,};
+        char            pgfid[36]                         = "";
+        char            xxh64[GF_XXH64_DIGEST_LENGTH*2+1] = {0,};
+        char            pgfid_bname[1024]                 = {0,};
+        char           *key                               = NULL;
+        char           *val                               = NULL;
+        size_t          key_size                          = 0;
+        size_t          val_size                          = 0;
+        const char     *file_path                         = NULL;
+        char           *file_path1                        = NULL;
+        char           *file_path2                        = NULL;
+
+        if (argc != 2) {
+                fprintf (stderr, "Usage: setgfid2path <file-path>\n");
+                return -1;
+        }
+
+        ret = sys_lstat (argv[1], &st);
+        if (ret != 0) {
+                fprintf (stderr, "Invalid File Path\n");
+                return -1;
+        }
+
+        if (st.st_nlink >= MAX_GFID2PATH_LINK_SUP) {
+                fprintf (stderr,
+                         "Number of Hardlink support exceeded. "
+                         "max=%d\n", MAX_GFID2PATH_LINK_SUP);
+                return -1;
+        }
+
+        file_path = argv[1];
+        file_path1 = strdup (file_path);
+        file_path2 = strdup (file_path);
+
+        dname = dirname (file_path1);
+        bname = basename (file_path2);
+
+        /* Get GFID of Parent directory */
+        ret_size = sys_lgetxattr (dname, GFID_XATTR_KEY, pgfid_raw, GFID_SIZE);
+        if (ret_size != GFID_SIZE) {
+                fprintf (stderr,
+                         "Failed to get GFID of parent directory. dir=%s\n",
+                         dname);
+                ret = -1;
+                goto out;
+        }
+
+        /* Convert to UUID format */
+        if (uuid_utoa_r (pgfid_raw, pgfid) == NULL) {
+                fprintf (stderr,
+                         "Failed to format GFID of parent directory. "
+                         "dir=%s GFID=%s\n", dname, pgfid_raw);
+                ret = -1;
+                goto out;
+        }
+
+        /* Find xxhash for PGFID/BaseName */
+        snprintf (pgfid_bname, sizeof (pgfid_bname), "%s/%s", pgfid, bname);
+        gf_xxh64_wrapper (
+                        (unsigned char *)pgfid_bname,
+                        strlen (pgfid_bname),
+                        GF_XXHSUM64_DEFAULT_SEED,
+                        xxh64
+                        );
+
+        key_size = strlen(GFID2PATH_XATTR_KEY_PREFIX) +
+                GF_XXH64_DIGEST_LENGTH*2+1;
+        key = alloca (key_size);
+        snprintf (key, key_size, GFID2PATH_XATTR_KEY_PREFIX"%s", xxh64);
+
+        val_size = UUID_CANONICAL_FORM_LEN + NAME_MAX + 2;
+        val = alloca (val_size);
+        snprintf (val, val_size, "%s/%s", pgfid, bname);
+
+        /* Set the Xattr, ignore if same key xattr already exists */
+        ret = sys_lsetxattr (file_path, key, val, strlen(val), XATTR_CREATE);
+        if (ret == -1) {
+                if (errno == EEXIST) {
+                        printf ("Xattr already exists, ignoring..\n");
+                        ret = 0;
+                        goto out;
+                }
+
+                fprintf (stderr,
+                         "Failed to set gfid2path xattr. errno=%d\n error=%s",
+                         errno, strerror(errno));
+                ret = -1;
+                goto out;
+        }
+
+        printf ("Success. file=%s key=%s value=%s\n", file_path, key, val);
+
+out:
+        if (file_path1 != NULL)
+                free (file_path1);
+
+        if (file_path2 != NULL)
+                free (file_path2);
+
+        return ret;
+}