From: yangsheng <Sheng.Yang@sun.com>
Date: Thu, 29 Jul 2010 09:49:18 +0000 (+0800)
Subject: b=23064 improve bdi usage
X-Git-Tag: v1_8_4_50~28
X-Git-Url: https://git.whamcloud.com/gitweb?a=commitdiff_plain;ds=sidebyside;h=53c88894ae6ab76d26ec44066efba3dc4036d71d;p=fs%2Flustre-release.git

b=23064 improve bdi usage

i=andreas
i=kalpak
i=johann
---

diff --git a/lustre/include/lustre_disk.h b/lustre/include/lustre_disk.h
index b3aaf54..791f356 100644
--- a/lustre/include/lustre_disk.h
+++ b/lustre/include/lustre_disk.h
@@ -297,9 +297,7 @@ 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 */
-#ifdef HAVE_NEW_BACKING_DEV_INFO
         struct backing_dev_info   bdi;         /* Each client mountpoint needs own backing_dev_info */
-#endif
 };
 
 #define LSI_SERVER                       0x00000001
diff --git a/lustre/llite/llite_lib.c b/lustre/llite/llite_lib.c
index fd7964d..c3ca662 100644
--- a/lustre/llite/llite_lib.c
+++ b/lustre/llite/llite_lib.c
@@ -991,18 +991,6 @@ out:
 }
 /* end COMPAT_146 */
 
-static struct backing_dev_info ll_backing_dev_info = {
-        .ra_pages       = 0,    /* No readahead */
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12))
-        .capabilities   = 0,    /* Does contribute to dirty memory */
-#else
-        .memory_backed  = 0,    /* Does contribute to dirty memory */
-#endif
-#ifdef HAVE_NEW_BACKING_DEV_INFO
-        .wb_cnt = 0,
-#endif
-};
-
 #ifdef HAVE_NEW_BACKING_DEV_INFO
 static atomic_t ll_bdi_num = ATOMIC_INIT(0);
 #endif
@@ -1138,8 +1126,10 @@ int ll_fill_super(struct super_block *sb)
         if (err)
                 GOTO(out_free, err);
 
+        memset(&lsi->bdi, 0, sizeof(lsi->bdi));
 #ifdef HAVE_NEW_BACKING_DEV_INFO
-        lsi->bdi = ll_backing_dev_info;
+        lsi->bdi.name = "lustre",
+        lsi->bdi.capabilities   = BDI_CAP_MAP_COPY,
         err = bdi_init(&lsi->bdi);
         if (err)
                 GOTO(out_free, err);
@@ -1150,6 +1140,7 @@ int ll_fill_super(struct super_block *sb)
                 bdi_destroy(&lsi->bdi);
                 GOTO(out_free, err);
         }
+        sb->s_bdi = &lsi->bdi;
 #endif
 
 out_free:
@@ -2013,6 +2004,9 @@ 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);
+
         if (S_ISREG(inode->i_mode)) {
                 struct ll_sb_info *sbi = ll_i2sbi(inode);
                 inode->i_op = &ll_file_inode_operations;
@@ -2031,12 +2025,6 @@ void ll_read_inode2(struct inode *inode, void *opaque)
                 inode->i_op = &ll_special_inode_operations;
                 init_special_inode(inode, inode->i_mode,
                                    kdev_t_to_nr(inode->i_rdev));
-                /* initializing backing dev info. */
-#ifdef HAVE_NEW_BACKING_DEV_INFO
-                inode->i_mapping->backing_dev_info = &(s2lsi(inode->i_sb)->bdi);
-#else
-                inode->i_mapping->backing_dev_info = &ll_backing_dev_info;
-#endif
                 EXIT;
         }
 }