lustre: Convert to separately allocated bdi

Allocate struct backing_dev_info separately instead of embedding it
inside superblock. This unifies handling of bdi among users.

CC: Oleg Drokin <oleg.drokin@intel.com>
CC: Andreas Dilger <andreas.dilger@intel.com>
CC: James Simmons <jsimmons@infradead.org>
CC: lustre-devel@lists.lustre.org
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/staging/lustre/lustre/include/lustre_disk.h b/drivers/staging/lustre/lustre/include/lustre_disk.h
index 8886458..a676bcc 100644 (file)
--- a/drivers/staging/lustre/lustre/include/lustre_disk.h
+++ b/drivers/staging/lustre/lustre/include/lustre_disk.h
@@ -133,13 +133,9 @@ struct lustre_sb_info {
        struct obd_export        *lsi_osd_exp;
        char                      lsi_osd_type[16];
        char                      lsi_fstype[16];
-       struct backing_dev_info   lsi_bdi;     /* each client mountpoint needs
-                                               * own backing_dev_info
-                                               */
 };
 
 #define LSI_UMOUNT_FAILOVER          0x00200000
-#define LSI_BDI_INITIALIZED          0x00400000
 
 #define     s2lsi(sb)  ((struct lustre_sb_info *)((sb)->s_fs_info))
 #define     s2lsi_nocast(sb) ((sb)->s_fs_info)

diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c
index b229cbc..d483c44 100644 (file)
--- a/drivers/staging/lustre/lustre/llite/llite_lib.c
+++ b/drivers/staging/lustre/lustre/llite/llite_lib.c
@@ -863,15 +863,6 @@ void ll_lli_init(struct ll_inode_info *lli)
        mutex_init(&lli->lli_layout_mutex);
 }
 
-static inline int ll_bdi_register(struct backing_dev_info *bdi)
-{
-       static atomic_t ll_bdi_num = ATOMIC_INIT(0);
-
-       bdi->name = "lustre";
-       return bdi_register(bdi, NULL, "lustre-%d",
-                           atomic_inc_return(&ll_bdi_num));
-}
-
 int ll_fill_super(struct super_block *sb, struct vfsmount *mnt)
 {
        struct lustre_profile *lprof = NULL;
@@ -881,6 +872,7 @@ int ll_fill_super(struct super_block *sb, struct vfsmount *mnt)
        char  *profilenm = get_profile_name(sb);
        struct config_llog_instance *cfg;
        int    err;
+       static atomic_t ll_bdi_num = ATOMIC_INIT(0);
 
        CDEBUG(D_VFSTRACE, "VFS Op: sb %p\n", sb);
 
@@ -903,16 +895,11 @@ int ll_fill_super(struct super_block *sb, struct vfsmount *mnt)
        if (err)
                goto out_free;
 
-       err = bdi_init(&lsi->lsi_bdi);
-       if (err)
-               goto out_free;
-       lsi->lsi_flags |= LSI_BDI_INITIALIZED;
-       lsi->lsi_bdi.capabilities = 0;
-       err = ll_bdi_register(&lsi->lsi_bdi);
+       err = super_setup_bdi_name(sb, "lustre-%d",
+                                  atomic_inc_return(&ll_bdi_num));
        if (err)
                goto out_free;
 
-       sb->s_bdi = &lsi->lsi_bdi;
        /* kernel >= 2.6.38 store dentry operations in sb->s_d_op. */
        sb->s_d_op = &ll_d_ops;
 
@@ -1033,11 +1020,6 @@ void ll_put_super(struct super_block *sb)
        if (profilenm)
                class_del_profile(profilenm);
 
-       if (lsi->lsi_flags & LSI_BDI_INITIALIZED) {
-               bdi_destroy(&lsi->lsi_bdi);
-               lsi->lsi_flags &= ~LSI_BDI_INITIALIZED;
-       }
-
        ll_free_sbi(sb);
        lsi->lsi_llsbi = NULL;