From: nathan <nathan>
Date: Thu, 18 Jun 2009 21:48:04 +0000 (+0000)
Subject: b=19669
X-Git-Tag: v1_9_220~126
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=b8785c155c81701a6e0d0ef397a347365e7de504;ds=sidebyside

b=19669
i=nrutman
i=adilger
add compat/incompat flags to lma
---

diff --git a/lustre/include/lustre/lustre_idl.h b/lustre/include/lustre/lustre_idl.h
index 3310fac..e648bda 100644
--- a/lustre/include/lustre/lustre_idl.h
+++ b/lustre/include/lustre/lustre_idl.h
@@ -253,10 +253,38 @@ static inline int range_is_exhausted(const struct lu_seq_range *range)
  * @{ */
 
 /**
+ * Flags for lustre_mdt_attrs::lma_compat and lustre_mdt_attrs::lma_incompat.
+ */
+enum lma_compat {
+        LMAC_HSM = 0x00000001,
+        LMAC_SOM = 0x00000002,
+};
+
+/**
+ * Masks for all features that should be supported by a Lustre version to
+ * access a specific file.
+ * This information is stored in lustre_mdt_attrs::lma_incompat.
+ *
+ * NOTE: No incompat feature should be added before bug #17670 is landed.
+ */
+#define LMA_INCOMPAT_SUPP 0x0
+
+/**
  * Following struct for MDT attributes, that will be kept inode's EA.
  * Introduced in 2.0 release (please see b15993, for details)
  */
 struct lustre_mdt_attrs {
+        /**
+         * Bitfield for supported data in this structure. From enum lma_compat.
+         * lma_self_fid and lma_flags are always available.
+         */
+        __u32   lma_compat;
+	/**
+         * Per-file incompat feature list. Lustre version should support all
+         * flags set in this field. The supported feature mask is available in
+         * LMA_INCOMPAT_SUPP.
+         */
+        __u32   lma_incompat;
         /** FID of this inode */
         struct lu_fid  lma_self_fid;
         /** SOM state, mdt/ost type, others */
diff --git a/lustre/mdd/mdd_device.c b/lustre/mdd/mdd_device.c
index 58de195..ac8133a 100644
--- a/lustre/mdd/mdd_device.c
+++ b/lustre/mdd/mdd_device.c
@@ -116,8 +116,10 @@ static void mdd_device_shutdown(const struct lu_env *env,
         ENTRY;
         mdd_changelog_fini(env, m);
         dt_txn_callback_del(m->mdd_child, &m->mdd_txn_cb);
-        mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_obf);
-        mdd_object_put(env, m->mdd_dot_lustre);
+        if (m->mdd_dot_lustre_objs.mdd_obf)
+                mdd_object_put(env, m->mdd_dot_lustre_objs.mdd_obf);
+        if (m->mdd_dot_lustre)
+                mdd_object_put(env, m->mdd_dot_lustre);
         if (m->mdd_obd_dev)
                 mdd_fini_obd(env, m, cfg);
         orph_index_fini(env, m);
diff --git a/lustre/osd/osd_handler.c b/lustre/osd/osd_handler.c
index 117547f..c584859 100644
--- a/lustre/osd/osd_handler.c
+++ b/lustre/osd/osd_handler.c
@@ -964,7 +964,7 @@ static const int osd_dto_credits_quota[DTO_NR] = {
         [DTO_INDEX_DELETE]  = 20,
         /**
          * Unused now.
-         */ 
+         */
         [DTO_IDNEX_UPDATE]  = 16,
         /*
          * Create a object. Same as create object in EXT3 filesystem.
@@ -980,7 +980,7 @@ static const int osd_dto_credits_quota[DTO_NR] = {
          * INDEX_EXTRA_BLOCKS(8) +
          * 3(inode bits, groups, GDT) +
          * QUOTA(?)
-         */ 
+         */
         [DTO_OBJECT_DELETE] = 27,
         /**
          * Attr set credits.
@@ -1772,6 +1772,15 @@ static int osd_ea_fid_get(const struct lu_env *env, struct dentry *dentry,
         rc = inode->i_op->getxattr(dentry, XATTR_NAME_LMA, (void *)mdt_attrs,
                                    sizeof *mdt_attrs);
 
+        /* Check LMA compatibility */
+        if (rc > 0 &&
+            (mdt_attrs->lma_incompat & ~cpu_to_be32(LMA_INCOMPAT_SUPP))) {
+                CWARN("Inode %lx: Unsupported incompat LMA feature(s) %#x\n",
+                      inode->i_ino, be32_to_cpu(mdt_attrs->lma_incompat) &
+                      ~LMA_INCOMPAT_SUPP);
+                return -ENOSYS;
+        }
+
         if (rc > 0) {
                 fid_be_to_cpu(fid, &mdt_attrs->lma_self_fid);
                 rc = 0;