linux-ext4 - [PATCH 1/2] ext4: force block allocation on quota

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Message-Id: <1275046062-457-1-git-send-email-dmonakhov@openvz.org>
Date:	Fri, 28 May 2010 15:27:41 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Cc:	jack@...e.cz, Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH 1/2] ext4: force block allocation on quota_off

Perform full sync procedure to guarantee quota consistency.

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/ext4/super.c |   15 ++++++++++++++-
 1 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e5166e5..4e8a7b5 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1075,6 +1075,7 @@ static int ext4_mark_dquot_dirty(struct dquot *dquot);
 static int ext4_write_info(struct super_block *sb, int type);
 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
 				char *path, int remount);
+static int ext4_quota_off(struct super_block *sb, int type, int remount);
 static int ext4_quota_on_mount(struct super_block *sb, int type);
 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
 			       size_t len, loff_t off);
@@ -1096,7 +1097,7 @@ static const struct dquot_operations ext4_quota_operations = {
 
 static const struct quotactl_ops ext4_qctl_operations = {
 	.quota_on	= ext4_quota_on,
-	.quota_off	= vfs_quota_off,
+	.quota_off	= ext4_quota_off,
 	.quota_sync	= vfs_quota_sync,
 	.get_info	= vfs_get_dqinfo,
 	.set_info	= vfs_set_dqinfo,
@@ -3986,6 +3987,18 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
 	return err;
 }
 
+static int ext4_quota_off(struct super_block *sb, int type, int remount)
+{
+	/* Force all delayed allocation blocks to be allocated */
+	if (test_opt(sb, DELALLOC) && !remount) {
+		down_read(&sb->s_umount);
+		sync_filesystem(sb);
+		up_read(&sb->s_umount);
+	}
+
+	return vfs_quota_off(sb, type, remount);
+}
+
 /* Read data from quotafile - avoid pagecache and such because we cannot afford
  * acquiring the locks... As quota files are never truncated and quota code
  * itself serializes the operations (and noone else should touch the files)
-- 
1.6.6.1

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