From: Lai Siyao <laisiyao@whamcloud.com>
Date: Wed, 2 Feb 2011 12:45:02 +0000 (+0100)
Subject: b=23064 create proper macro check for bdi interface
X-Git-Tag: 1.8.5.54~1
X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=f86d6d4635dd41cb825c4269bd997b0d0a513b12;p=fs%2Flustre-release.git

b=23064 create proper macro check for bdi interface

i=johann
---

diff --git a/lustre/ChangeLog b/lustre/ChangeLog
index b16175c..1e8ab27 100644
--- a/lustre/ChangeLog
+++ b/lustre/ChangeLog
@@ -95,6 +95,10 @@ Description: ASSERTION(atomic_read(&client_stat->nid_exp_ref_count) == 0)
 Details    : Reconnecting from a different nid causes old per-nid stats not to be
              released.
 
+Severity   : normal
+Bugzilla   : 23064
+Description: create proper macro check for bdi interface.
+
 -------------------------------------------------------------------------------
 
 2010-10-29 Oracle, Inc.
diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index 006f3b1..057ded5 100644
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -1764,18 +1764,28 @@ LB_LINUX_TRY_COMPILE([
 ])
 ])
 
-# 2.6.32 has new BDI interface.
-AC_DEFUN([LC_NEW_BACKING_DEV_INFO],
-[AC_MSG_CHECKING([if backing_dev_info has a bdi_list field])
+# 2.6.32 has bdi_register() functions.
+AC_DEFUN([LC_EXPORT_BDI_REGISTER],
+[LB_CHECK_SYMBOL_EXPORT([bdi_register],
+[mm/backing-dev.c],[
+        AC_DEFINE(HAVE_BDI_REGISTER, 1,
+                [bdi_register function is present])
+],[
+])
+])
+
+# 2.6.32 add s_bdi for super block
+AC_DEFUN([LC_SB_BDI],
+[AC_MSG_CHECKING([if super_block has s_bdi field])
 LB_LINUX_TRY_COMPILE([
-        #include <linux/backing-dev.h>
+        #include <linux/fs.h>
 ],[
-        struct backing_dev_info bdi;
-        memset(&bdi.bdi_list, 0x00, sizeof(bdi.bdi_list));
+        struct super_block sb;
+        sb.s_bdi = NULL;
 ],[
         AC_MSG_RESULT(yes)
-        AC_DEFINE(HAVE_NEW_BACKING_DEV_INFO, 1,
-                  [backing_dev_info has a bdi_list field])
+        AC_DEFINE(HAVE_SB_BDI, 1,
+                  [super_block has s_bdi field])
 ],[
         AC_MSG_RESULT(no)
 ])
@@ -1989,7 +1999,8 @@ AC_DEFUN([LC_PROG_LINUX],
           LC_BLK_QUEUE_LOG_BLK_SIZE
 
           # 2.6.32
-          LC_NEW_BACKING_DEV_INFO
+          LC_EXPORT_BDI_REGISTER
+          LC_SB_BDI
           if test x$enable_server = xyes ; then
               LC_WALK_SPACE_HAS_DATA_SEM
           fi
diff --git a/lustre/include/lustre_disk.h b/lustre/include/lustre_disk.h
index 791f356..7446b9f 100644
--- a/lustre/include/lustre_disk.h
+++ b/lustre/include/lustre_disk.h
@@ -297,12 +297,13 @@ struct lustre_sb_info {
         struct ll_sb_info        *lsi_llsbi;   /* add'l client sbi info */
         struct vfsmount          *lsi_srv_mnt; /* the one server mount */
         atomic_t                  lsi_mounts;  /* references to the srv_mnt */
-        struct backing_dev_info   bdi;         /* Each client mountpoint needs own backing_dev_info */
+        struct backing_dev_info   lsi_bdi;     /* each client mountpoint needs own backing_dev_info */
 };
 
 #define LSI_SERVER                       0x00000001
 #define LSI_UMOUNT_FORCE                 0x00000010
 #define LSI_UMOUNT_FAILOVER              0x00000020
+#define LSI_BDI_INITIALIZED              0x00000040
 
 #define    s2lsi(sb)        ((struct lustre_sb_info *)((sb)->s_fs_info))
 #define    s2lsi_nocast(sb) ((sb)->s_fs_info)
diff --git a/lustre/llite/llite_lib.c b/lustre/llite/llite_lib.c
index dcc0862..72f9b13 100644
--- a/lustre/llite/llite_lib.c
+++ b/lustre/llite/llite_lib.c
@@ -998,7 +998,7 @@ out:
 }
 /* end COMPAT_146 */
 
-#ifdef HAVE_NEW_BACKING_DEV_INFO
+#ifdef HAVE_BDI_REGISTER
 static atomic_t ll_bdi_num = ATOMIC_INIT(0);
 #endif
 
@@ -1134,16 +1134,19 @@ int ll_fill_super(struct super_block *sb)
                 GOTO(out_free, err);
 
 #ifdef HAVE_BDI_INIT
-        err = bdi_init(&lsi->bdi);
+        err = bdi_init(&lsi->lsi_bdi);
         if (err)
                 GOTO(out_free, err);
+        lsi->lsi_flags |= LSI_BDI_INITIALIZED;
+        lsi->lsi_bdi.capabilities = BDI_CAP_MAP_COPY;
+#ifdef HAVE_BDI_REGISTER
+        err = bdi_register(&lsi->lsi_bdi, NULL, "lustre-%d",
+                           atomic_inc_return(&ll_bdi_num));
 #endif
-#ifdef HAVE_NEW_BACKING_DEV_INFO
-        lsi->bdi.name = "lustre";
-        lsi->bdi.capabilities = BDI_CAP_MAP_COPY;
-        err = bdi_register(&lsi->bdi, NULL, "lustre-%d",
-                                atomic_inc_return(&ll_bdi_num));
-        sb->s_bdi = &lsi->bdi;
+#endif
+
+#ifdef HAVE_SB_BDI
+        sb->s_bdi    = &lsi->lsi_bdi;
 #endif
 
 out_free:
@@ -1208,13 +1211,10 @@ void ll_put_super(struct super_block *sb)
         if (profilenm)
                 class_del_profile(profilenm);
 
-#ifdef HAVE_NEW_BACKING_DEV_INFO
-        if (lsi->bdi.wb_cnt > 0) {
-#endif
 #ifdef HAVE_BDI_INIT
-                bdi_destroy(&lsi->bdi);
-#endif
-#ifdef HAVE_NEW_BACKING_DEV_INFO
+        if (lsi->lsi_flags & LSI_BDI_INITIALIZED) {
+                bdi_destroy(&lsi->lsi_bdi);
+                lsi->lsi_flags &= ~LSI_BDI_INITIALIZED;
         }
 #endif
 
@@ -2014,7 +2014,7 @@ void ll_read_inode2(struct inode *inode, void *opaque)
         /* OIDEBUG(inode); */
 
         /* initializing backing dev info. */
-        inode->i_mapping->backing_dev_info = &(s2lsi(inode->i_sb)->bdi);
+        inode->i_mapping->backing_dev_info = &s2lsi(inode->i_sb)->lsi_bdi;
 
         if (S_ISREG(inode->i_mode)) {
                 struct ll_sb_info *sbi = ll_i2sbi(inode);