LU-11025 dne: introduce new directory hash type: "crush"

[fs/lustre-release.git] / lustre / lod / lproc_lod.c

diff --git a/lustre/lod/lproc_lod.c b/lustre/lod/lproc_lod.c
index bcc09b9..8143d8c 100644 (file)
--- a/lustre/lod/lproc_lod.c
+++ b/lustre/lod/lproc_lod.c
@@ -869,6 +869,50 @@ static ssize_t lmv_failout_store(struct kobject *kobj, struct attribute *attr,
 }
 LUSTRE_RW_ATTR(lmv_failout);
 
+char *mdt_hash_name[] = { "none",
+                         LMV_HASH_NAME_ALL_CHARS,
+                         LMV_HASH_NAME_FNV_1A_64,
+                         LMV_HASH_NAME_CRUSH,
+};
+
+static ssize_t mdt_hash_show(struct kobject *kobj, struct attribute *attr,
+                            char *buf)
+{
+       struct dt_device *dt = container_of(kobj, struct dt_device, dd_kobj);
+       struct lod_device *lod = dt2lod_dev(dt);
+
+       return snprintf(buf, PAGE_SIZE, "%s\n",
+               mdt_hash_name[lod->lod_mdt_descs.ltd_lmv_desc.ld_pattern]);
+}
+
+static ssize_t mdt_hash_store(struct kobject *kobj, struct attribute *attr,
+                             const char *buffer, size_t count)
+{
+       struct dt_device *dt = container_of(kobj, struct dt_device, dd_kobj);
+       struct lod_device *lod = dt2lod_dev(dt);
+       char *hash;
+       int len;
+       int i;
+
+       hash = kstrndup(buffer, count, GFP_KERNEL);
+       if (!hash)
+               return -ENOMEM;
+
+       len = strcspn(hash, "\n ");
+       hash[len] = '\0';
+       for (i = LMV_HASH_TYPE_ALL_CHARS; i < LMV_HASH_TYPE_MAX; i++) {
+               if (!strcmp(hash, mdt_hash_name[i])) {
+                       lod->lod_mdt_descs.ltd_lmv_desc.ld_pattern = i;
+                       kfree(hash);
+                       return count;
+               }
+       }
+       kfree(hash);
+
+       return -EINVAL;
+}
+LUSTRE_RW_ATTR(mdt_hash);
+
 static struct lprocfs_vars lprocfs_lod_obd_vars[] = {
        { NULL }
 };
@@ -909,6 +953,7 @@ static struct attribute *lod_attrs[] = {
        &lustre_attr_mdt_qos_maxage.attr,
        &lustre_attr_mdt_qos_prio_free.attr,
        &lustre_attr_mdt_qos_threshold_rr.attr,
+       &lustre_attr_mdt_hash.attr,
        NULL,
 };