From: Vitaly Fertman <vitaly.fertman@sun.com>
Date: Thu, 4 Nov 2010 20:53:32 +0000 (+0300)
Subject: b=23064 Adopt for new backing_dev_info interface.
X-Git-Tag: 2.0.55.0~1
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=e218d06f97d0c3bb8ddba68060320a1ff45984b8

b=23064 Adopt for new backing_dev_info interface.

o=yangsheng
i=dmitry
---

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index 07d339e..bb9bf6e 100644
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -1899,6 +1899,33 @@ 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 wb_cnt field])
+LB_LINUX_TRY_COMPILE([
+        #include <linux/backing-dev.h>
+],[
+        struct backing_dev_info bdi;
+        bdi.wb_cnt = 0;
+],[
+        AC_MSG_RESULT(yes)
+        AC_DEFINE(HAVE_NEW_BACKING_DEV_INFO, 1,
+                  [backing_dev_info has a wb_cnt field])
+],[
+        AC_MSG_RESULT(no)
+])
+])
+
+# 2.6.24 has bdi_init()/bdi_destroy() functions.
+AC_DEFUN([LC_EXPORT_BDI_INIT],
+[LB_CHECK_SYMBOL_EXPORT([bdi_init],
+[mm/backing-dev.c],[
+        AC_DEFINE(HAVE_BDI_INIT, 1,
+                [bdi_init/bdi_destroy functions are present])
+],[
+])
+])
+
 #
 # LC_PROG_LINUX
 #
@@ -2011,6 +2038,7 @@ AC_DEFUN([LC_PROG_LINUX],
          LC_STRUCT_HASH_DESC
          LC_STRUCT_BLKCIPHER_DESC
          LC_FS_RENAME_DOES_D_MOVE
+
          # 2.6.23
          LC_UNREGISTER_BLKDEV_RETURN_INT
          LC_KERNEL_SPLICE_READ
@@ -2024,6 +2052,7 @@ AC_DEFUN([LC_PROG_LINUX],
          LC_BIO_ENDIO_2ARG
          LC_FH_TO_DENTRY
          LC_PROCFS_DELETED
+         LC_EXPORT_BDI_INIT
 
          #2.6.25
          LC_MAPPING_CAP_WRITEBACK_DIRTY
@@ -2055,6 +2084,7 @@ AC_DEFUN([LC_PROG_LINUX],
          # 2.6.32
          LC_DQUOT_INIT
          LC_REQUEST_QUEUE_LIMITS
+         LC_NEW_BACKING_DEV_INFO
 
          #
          if test x$enable_server = xyes ; then
diff --git a/lustre/include/linux/lustre_compat25.h b/lustre/include/linux/lustre_compat25.h
index d2b3f80..05af255 100644
--- a/lustre/include/linux/lustre_compat25.h
+++ b/lustre/include/linux/lustre_compat25.h
@@ -805,5 +805,19 @@ static inline int ll_quota_off(struct super_block *sb, int off, int remount)
 # define ll_vfs_dq_drop vfs_dq_drop
 #endif
 
+#ifdef HAVE_BDI_INIT
+#define ll_bdi_init(bdi)    bdi_init(bdi)
+#define ll_bdi_destroy(bdi) bdi_destroy(bdi)
+#else
+#define ll_bdi_init(bdi)    0
+#define ll_bdi_destroy(bdi) do { } while(0)
+#endif
+
+#ifdef HAVE_NEW_BACKING_DEV_INFO
+#define ll_bdi_wb_cnt(bdi) ((bdi).wb_cnt)
+#else
+#define ll_bdi_wb_cnt(bdi) 1
+#endif
+
 #endif /* __KERNEL__ */
 #endif /* _COMPAT25_H */
diff --git a/lustre/include/lustre_disk.h b/lustre/include/lustre_disk.h
index 0915d80..8c3e8c8 100644
--- a/lustre/include/lustre_disk.h
+++ b/lustre/include/lustre_disk.h
@@ -436,6 +436,7 @@ struct lustre_sb_info {
         struct ll_sb_info        *lsi_llsbi;   /* add'l client sbi info */
         struct vfsmount          *lsi_srv_mnt; /* the one server mount */
         cfs_atomic_t              lsi_mounts;  /* references to the srv_mnt */
+        struct backing_dev_info   bdi;         /* Each client mountpoint needs own backing_dev_info */
 };
 
 #define LSI_SERVER                       0x00000001
diff --git a/lustre/llite/llite_lib.c b/lustre/llite/llite_lib.c
index 5c98d39..c3e66ba 100644
--- a/lustre/llite/llite_lib.c
+++ b/lustre/llite/llite_lib.c
@@ -817,6 +817,10 @@ void ll_lli_init(struct ll_inode_info *lli)
         cfs_spin_lock_init(&lli->lli_sa_lock);
 }
 
+#ifdef HAVE_NEW_BACKING_DEV_INFO
+static atomic_t ll_bdi_num = ATOMIC_INIT(0);
+#endif
+
 int ll_fill_super(struct super_block *sb)
 {
         struct lustre_profile *lprof;
@@ -844,6 +848,18 @@ int ll_fill_super(struct super_block *sb)
         if (err)
                 GOTO(out_free, err);
 
+        err = ll_bdi_init(&lsi->bdi);
+        if (err)
+                GOTO(out_free, err);
+
+#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
+
         /* Generate a string unique to this super, in case some joker tries
            to mount the same fs at two mount points.
            Use the address of the super itself.*/
@@ -948,6 +964,9 @@ void ll_put_super(struct super_block *sb)
         if (profilenm)
                 class_del_profile(profilenm);
 
+        if (ll_bdi_wb_cnt(lsi->bdi) > 0)
+                ll_bdi_destroy(&lsi->bdi);
+
         ll_free_sbi(sb);
         lsi->lsi_llsbi = NULL;
 
@@ -1613,15 +1632,6 @@ void ll_update_inode(struct inode *inode, struct lustre_md *md)
         }
 }
 
-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
-};
-
 void ll_read_inode2(struct inode *inode, void *opaque)
 {
         struct lustre_md *md = opaque;
@@ -1647,6 +1657,10 @@ 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;
@@ -1667,9 +1681,6 @@ void ll_read_inode2(struct inode *inode, void *opaque)
                 init_special_inode(inode, inode->i_mode,
                                    kdev_t_to_nr(inode->i_rdev));
 
-                /* initializing backing dev info. */
-                inode->i_mapping->backing_dev_info = &ll_backing_dev_info;
-
                 EXIT;
         }
 }