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.

Change-Id: I75ad82c86ce482950645e687ff2e33b413fa53da
Updates: #139
Signed-off-by: Aravinda VK <avishwan@redhat.com>
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>

1 files changed, 128 insertions, 0 deletions

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;
+}