linux-ext4 - [PATCH 3/8] ext3: remove lock/unlock super

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Date:	Thu, 16 Aug 2012 12:00:26 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	bharrosh@...asas.com, bhalevy@...ian.com, jack@...e.cz,
	Andrew Morton <akpm@...ux-foundation.org>,
	adilger.kernel@...ger.ca, tytso@....edu,
	hirofumi@...l.parknet.co.jp, mikulas@...ax.karlin.mff.cuni.cz,
	Al Viro <viro@...IV.linux.org.uk>, hch@...radead.org,
	dushistov@...l.ru, osd-dev@...n-osd.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: [PATCH 3/8] ext3: remove lock/unlock super

From: Marco Stornelli <marco.stornelli@...il.com>

Replaced lock and unlock super with a new fs mutex s_lock.

Signed-off-by: Marco Stornelli <marco.stornelli@...il.com>
---

diff -Nurp linux-3.6-rc1-orig/fs/ext3/ext3.h linux-3.6-rc1/fs/ext3/ext3.h
--- linux-3.6-rc1-orig/fs/ext3/ext3.h	2012-08-16 09:37:31.000000000 +0200
+++ linux-3.6-rc1/fs/ext3/ext3.h	2012-08-16 09:46:39.000000000 +0200
@@ -672,6 +672,7 @@ struct ext3_sb_info {
 	char *s_qf_names[MAXQUOTAS];		/* Names of quota files with journalled quota */
 	int s_jquota_fmt;			/* Format of quota to use */
 #endif
+	struct mutex s_lock;
 };
  static inline spinlock_t *
diff -Nurp linux-3.6-rc1-orig/fs/ext3/super.c linux-3.6-rc1/fs/ext3/super.c
--- linux-3.6-rc1-orig/fs/ext3/super.c	2012-08-16 09:37:31.000000000 +0200
+++ linux-3.6-rc1/fs/ext3/super.c	2012-08-16 09:49:11.000000000 +0200
@@ -1939,6 +1939,7 @@ static int ext3_fill_super (struct super
 	sbi->s_gdb_count = db_count;
 	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 	spin_lock_init(&sbi->s_next_gen_lock);
+	mutex_init(&sbi->s_lock);
  	/* per fileystem reservation list head & lock */
 	spin_lock_init(&sbi->s_rsv_window_lock);
@@ -2582,11 +2583,11 @@ out:
 static int ext3_unfreeze(struct super_block *sb)
 {
 	if (!(sb->s_flags & MS_RDONLY)) {
-		lock_super(sb);
+		mutex_lock(&EXT3_SB(sb)->s_lock);
 		/* Reser the needs_recovery flag before the fs is unlocked. */
 		EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 		ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
-		unlock_super(sb);
+		mutex_unlock(&EXT3_SB(sb)->s_lock);
 		journal_unlock_updates(EXT3_SB(sb)->s_journal);
 	}
 	return 0;
@@ -2606,7 +2607,7 @@ static int ext3_remount (struct super_bl
 #endif
  	/* Store the original options */
-	lock_super(sb);
+	mutex_lock(&EXT3_SB(sb)->s_lock);
 	old_sb_flags = sb->s_flags;
 	old_opts.s_mount_opt = sbi->s_mount_opt;
 	old_opts.s_resuid = sbi->s_resuid;
@@ -2712,7 +2713,7 @@ static int ext3_remount (struct super_bl
 		    old_opts.s_qf_names[i] != sbi->s_qf_names[i])
 			kfree(old_opts.s_qf_names[i]);
 #endif
-	unlock_super(sb);
+	mutex_unlock(&EXT3_SB(sb)->s_lock);
  	if (enable_quota)
 		dquot_resume(sb, -1);
@@ -2732,7 +2733,7 @@ restore_opts:
 		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
 	}
 #endif
-	unlock_super(sb);
+	mutex_unlock(&EXT3_SB(sb)->s_lock);
 	return err;
 }
 
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