ext4: drop lock_super()/unlock_super()

We don't need lock_super()/unlock_super() any more, since the places
where it is used, we are protected by the s_umount r/w semaphore.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Marco Stornelli <marco.stornelli@gmail.com>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 3ab798d..bae4124 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -861,7 +861,6 @@ static void ext4_put_super(struct super_block *sb)
        flush_workqueue(sbi->dio_unwritten_wq);
        destroy_workqueue(sbi->dio_unwritten_wq);
 
-       lock_super(sb);
        if (sbi->s_journal) {
                err = jbd2_journal_destroy(sbi->s_journal);
                sbi->s_journal = NULL;
@@ -928,7 +927,6 @@ static void ext4_put_super(struct super_block *sb)
         * Now that we are completely done shutting down the
         * superblock, we need to actually destroy the kobject.
         */
-       unlock_super(sb);
        kobject_put(&sbi->s_kobj);
        wait_for_completion(&sbi->s_kobj_unregister);
        if (sbi->s_chksum_driver)
@@ -4535,11 +4533,9 @@ static int ext4_unfreeze(struct super_block *sb)
        if (sb->s_flags & MS_RDONLY)
                return 0;
 
-       lock_super(sb);
        /* Reset the needs_recovery flag before the fs is unlocked. */
        EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
        ext4_commit_super(sb, 1);
-       unlock_super(sb);
        return 0;
 }
 
@@ -4575,7 +4571,6 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
        char *orig_data = kstrdup(data, GFP_KERNEL);
 
        /* Store the original options */
-       lock_super(sb);
        old_sb_flags = sb->s_flags;
        old_opts.s_mount_opt = sbi->s_mount_opt;
        old_opts.s_mount_opt2 = sbi->s_mount_opt2;
@@ -4717,7 +4712,6 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
        if (sbi->s_journal == NULL)
                ext4_commit_super(sb, 1);
 
-       unlock_super(sb);
 #ifdef CONFIG_QUOTA
        /* Release old quota file names */
        for (i = 0; i < MAXQUOTAS; i++)
@@ -4730,10 +4724,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
                else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
                                        EXT4_FEATURE_RO_COMPAT_QUOTA)) {
                        err = ext4_enable_quotas(sb);
-                       if (err) {
-                               lock_super(sb);
+                       if (err)
                                goto restore_opts;
-                       }
                }
        }
 #endif
@@ -4760,7 +4752,6 @@ restore_opts:
                sbi->s_qf_names[i] = old_opts.s_qf_names[i];
        }
 #endif
-       unlock_super(sb);
        kfree(orig_data);
        return err;
 }