summaryrefslogtreecommitdiffstats
path: root/xlators/features/changelog/src/changelog-helpers.c
diff options
context:
space:
mode:
authorKotresh HR <khiremat@redhat.com>2015-04-14 14:42:46 +0530
committerVijay Bellur <vbellur@redhat.com>2015-05-05 06:02:22 -0700
commitedfe56dfd8ceb4ef0c160484de04af30e8f5b7df (patch)
treee6097bb4a8e10289d94efbf5208ad54427e7f626 /xlators/features/changelog/src/changelog-helpers.c
parentbbed54fbac0073e494e354bea45ff725b0560714 (diff)
feature/changelog: Capture path for deletes
PROBLEM: There is no way to get the path of deleted file if we have gfid from changelog since the file is already deleted. SOLUTION: Do a recursive readlink on parent gfid in backend .glusterfs path to get the complete path in I/O callpath in changelog translator and capture it in callback. The path captured is relative from the brick root. The field separator used is '\0'. e.g., ......\0<pgfid>/bname\0<relative-path>\0<next-record> ADDITIONAL REQUIRED CHANGES: 1. The changelog translator option called "changelog.capture-del-path" is introduced to enable or disable the capturing of deleted entry path. e.g., gluster vol set <vol-name> changelog.capture-del-path on/off If capture-del-path is disabled, '\0' is captured instead of relative path. e.g., ......\0<pgfid>/bname\0\0\0<next-record> 2. The minor number in the version of changelog is bumped up from v1.1 to v1.2. 3. If recursive readlink is failed for some reason, it will capture \0 in place of <relative path>. e.g., ......\0<pgfid>/bname\0\0\0<next-record> (same as when caputre-del-path option is disabled) 4. If bname argument passed to "resolve_pargfid_to_path" function is NULL and pargfid is ROOT, "." is returned. This is not the case with changelog, where bname is always passed. This is applicable to other consumers of "resolve_pargfid_to_path" routine. NOTE: Changelog parser should consider the above new changes and should parse accordingly. BUG: 1218383 Change-Id: I5d89cf4157befd207771f6c0248d2493fbf85832 Signed-off-by: Kotresh HR <khiremat@redhat.com> Reviewed-on: http://review.gluster.org/10288 Reviewed-on: http://review.gluster.org/10535 Tested-by: Gluster Build System <jenkins@build.gluster.com> Tested-by: NetBSD Build System Reviewed-by: Aravinda VK <avishwan@redhat.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Diffstat (limited to 'xlators/features/changelog/src/changelog-helpers.c')
-rw-r--r--xlators/features/changelog/src/changelog-helpers.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/xlators/features/changelog/src/changelog-helpers.c b/xlators/features/changelog/src/changelog-helpers.c
index a72ad25e4bc..0a29969194e 100644
--- a/xlators/features/changelog/src/changelog-helpers.c
+++ b/xlators/features/changelog/src/changelog-helpers.c
@@ -1735,3 +1735,88 @@ err:
inode_unref (parent);
return -1;
}
+
+/*
+ * resolve_pargfid_to_path:
+ * It converts given pargfid to path by doing recursive readlinks at the
+ * backend. If bname is given, it suffixes bname to pargfid to form the
+ * complete path else it doesn't. It allocates memory for the path and is
+ * caller's responsibility to free the same. If bname is NULL and pargfid
+ * is ROOT, then it returns "."
+ */
+
+int
+resolve_pargfid_to_path (xlator_t *this, uuid_t pargfid,
+ char **path, char *bname)
+{
+ char *linkname = NULL;
+ char *dir_handle = NULL;
+ char *pgfidstr = NULL;
+ char *saveptr = NULL;
+ ssize_t len = 0;
+ int ret = 0;
+ uuid_t tmp_gfid = {0, };
+ changelog_priv_t *priv = NULL;
+ char gpath[PATH_MAX] = {0,};
+ char result[PATH_MAX] = {0,};
+ char *dir_name = NULL;
+ char pre_dir_name[PATH_MAX] = {0,};
+
+ GF_ASSERT (this);
+ priv = this->private;
+ GF_ASSERT (priv);
+
+ if (!path || gf_uuid_is_null (pargfid)) {
+ ret = -1;
+ goto out;
+ }
+
+ if (__is_root_gfid (pargfid)) {
+ if (bname)
+ *path = gf_strdup (bname);
+ else
+ *path = gf_strdup (".");
+ return ret;
+ }
+
+ dir_handle = alloca (PATH_MAX);
+ linkname = alloca (PATH_MAX);
+ (void) snprintf (gpath, PATH_MAX, "%s/.glusterfs/",
+ priv->changelog_brick);
+
+ while (!(__is_root_gfid (pargfid))) {
+ snprintf (dir_handle, PATH_MAX, "%s/%02x/%02x/%s", gpath,
+ pargfid[0], pargfid[1], uuid_utoa (pargfid));
+
+ len = readlink (dir_handle, linkname, PATH_MAX);
+ if (len < 0) {
+ gf_log (this->name, GF_LOG_ERROR, "could not read the "
+ "link from the gfid handle %s (%s)", dir_handle,
+ strerror (errno));
+ ret = -1;
+ goto out;
+ }
+
+ linkname[len] = '\0';
+
+ pgfidstr = strtok_r (linkname + strlen("../../00/00/"), "/",
+ &saveptr);
+ dir_name = strtok_r (NULL, "/", &saveptr);
+
+ strncpy (result, dir_name, PATH_MAX);
+ strncat (result, "/", 1);
+ strncat (result, pre_dir_name, PATH_MAX);
+ strncpy (pre_dir_name, result, PATH_MAX);
+
+ gf_uuid_parse (pgfidstr, tmp_gfid);
+ gf_uuid_copy (pargfid, tmp_gfid);
+ }
+
+ if (bname)
+ strncat (result, bname, PATH_MAX);
+
+ *path = gf_strdup (result);
+
+out:
+ return ret;
+}