ext4: each filesystem creates and uses its own mb_cache

[firefly-linux-kernel-4.4.55.git] / fs / ext4 / super.c

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 89baee42f35340809931aed907bcaa4da28e41bb..5a51af7d033524d58e9d7359326c48bba2742529 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -59,6 +59,7 @@ static struct kset *ext4_kset;
 static struct ext4_lazy_init *ext4_li_info;
 static struct mutex ext4_li_mtx;
 static struct ext4_features *ext4_feat;
+static int ext4_mballoc_ready;
 
 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
                             unsigned long journal_devnum);
@@ -845,6 +846,10 @@ static void ext4_put_super(struct super_block *sb)
                invalidate_bdev(sbi->journal_bdev);
                ext4_blkdev_remove(sbi);
        }
+       if (sbi->s_mb_cache) {
+               ext4_xattr_destroy_cache(sbi->s_mb_cache);
+               sbi->s_mb_cache = NULL;
+       }
        if (sbi->s_mmp_tsk)
                kthread_stop(sbi->s_mmp_tsk);
        sb->s_fs_info = NULL;
@@ -4010,6 +4015,14 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
        percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
 
 no_journal:
+       if (ext4_mballoc_ready) {
+               sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
+               if (!sbi->s_mb_cache) {
+                       ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
+                       goto failed_mount_wq;
+               }
+       }
+
        /*
         * Get the # of file system overhead blocks from the
         * superblock if present.
@@ -5518,12 +5531,10 @@ static int __init ext4_init_fs(void)
                goto out4;
 
        err = ext4_init_mballoc();
-       if (err)
-               goto out3;
-
-       err = ext4_init_xattr();
        if (err)
                goto out2;
+       else
+               ext4_mballoc_ready = 1;
        err = init_inodecache();
        if (err)
                goto out1;
@@ -5539,10 +5550,9 @@ out:
        unregister_as_ext3();
        destroy_inodecache();
 out1:
-       ext4_exit_xattr();
-out2:
+       ext4_mballoc_ready = 0;
        ext4_exit_mballoc();
-out3:
+out2:
        ext4_exit_feat_adverts();
 out4:
        if (ext4_proc_root)
@@ -5565,7 +5575,6 @@ static void __exit ext4_exit_fs(void)
        unregister_as_ext3();
        unregister_filesystem(&ext4_fs_type);
        destroy_inodecache();
-       ext4_exit_xattr();
        ext4_exit_mballoc();
        ext4_exit_feat_adverts();
        remove_proc_entry("fs/ext4", NULL);