linux-ext4 - [PATCH 2/3] ext4: fix quota accounting during migration

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Message-Id: <1316266379-18737-2-git-send-email-dmonakhov@openvz.org>
Date:	Sat, 17 Sep 2011 17:32:58 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	linux-ext4@...r.kernel.org
Cc:	aneesh.kumar@...ux.vnet.ibm.com, tytso@....edu,
	Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH 2/3] ext4: fix quota accounting during migration

tmp_inode should have same uid/gid as  original inode.
Otherwise new metadata blocks will be accounted in to wrong
quota-id which result in quota leak after indirect blocks swap.

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/ext4/ext4.h    |    3 ++-
 fs/ext4/ialloc.c  |    9 ++++++---
 fs/ext4/migrate.c |    7 +++++--
 fs/ext4/namei.c   |    8 ++++----
 4 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index e717dfd..3aa2f7c 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1775,7 +1775,8 @@ extern int ext4fs_dirhash(const char *name, int len, struct
 
 /* ialloc.c */
 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
-				    const struct qstr *qstr, __u32 goal);
+				const struct qstr *qstr, __u32 goal,
+				uid_t *owner);
 extern void ext4_free_inode(handle_t *, struct inode *);
 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
 extern unsigned long ext4_count_free_inodes(struct super_block *);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 9c63f27..9bfa93e 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -802,7 +802,7 @@ err_ret:
  * group to find a free inode.
  */
 struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, int mode,
-			     const struct qstr *qstr, __u32 goal)
+			const struct qstr *qstr, __u32 goal, uid_t *owner)
 {
 	struct super_block *sb;
 	struct buffer_head *inode_bitmap_bh = NULL;
@@ -987,8 +987,11 @@ got:
 		flex_group = ext4_flex_group(sbi, group);
 		atomic_dec(&sbi->s_flex_groups[flex_group].free_inodes);
 	}
-
-	if (test_opt(sb, GRPID)) {
+	if (owner) {
+		inode->i_mode = mode;
+		inode->i_uid = owner[0];
+		inode->i_gid = owner[1];
+	} else if (test_opt(sb, GRPID)) {
 		inode->i_mode = mode;
 		inode->i_uid = current_fsuid();
 		inode->i_gid = dir->i_gid;
diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index e263d78..74f2900 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -438,6 +438,7 @@ int ext4_ext_migrate(struct inode *inode)
 	struct migrate_struct lb;
 	unsigned long max_entries;
 	__u32 goal;
+	uid_t owner[2];
 
 	/*
 	 * If the filesystem does not support extents, or the inode
@@ -465,10 +466,12 @@ int ext4_ext_migrate(struct inode *inode)
 	}
 	goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
 		EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
+	owner[0] = inode->i_uid;
+	owner[1] = inode->i_gid;
 	tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
-				   S_IFREG, NULL, goal);
+				S_IFREG, NULL, goal, owner);
 	if (IS_ERR(tmp_inode)) {
-		retval = -ENOMEM;
+		retval = PTR_ERR(inode);
 		ext4_journal_stop(handle);
 		return retval;
 	}
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index f8068c7..d5f50de 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1755,7 +1755,7 @@ retry:
 	if (IS_DIRSYNC(dir))
 		ext4_handle_sync(handle);
 
-	inode = ext4_new_inode(handle, dir, mode, &dentry->d_name, 0);
+	inode = ext4_new_inode(handle, dir, mode, &dentry->d_name, 0, NULL);
 	err = PTR_ERR(inode);
 	if (!IS_ERR(inode)) {
 		inode->i_op = &ext4_file_inode_operations;
@@ -1791,7 +1791,7 @@ retry:
 	if (IS_DIRSYNC(dir))
 		ext4_handle_sync(handle);
 
-	inode = ext4_new_inode(handle, dir, mode, &dentry->d_name, 0);
+	inode = ext4_new_inode(handle, dir, mode, &dentry->d_name, 0, NULL);
 	err = PTR_ERR(inode);
 	if (!IS_ERR(inode)) {
 		init_special_inode(inode, inode->i_mode, rdev);
@@ -1831,7 +1831,7 @@ retry:
 		ext4_handle_sync(handle);
 
 	inode = ext4_new_inode(handle, dir, S_IFDIR | mode,
-			       &dentry->d_name, 0);
+				&dentry->d_name, 0, NULL);
 	err = PTR_ERR(inode);
 	if (IS_ERR(inode))
 		goto out_stop;
@@ -2278,7 +2278,7 @@ retry:
 		ext4_handle_sync(handle);
 
 	inode = ext4_new_inode(handle, dir, S_IFLNK|S_IRWXUGO,
-			       &dentry->d_name, 0);
+				&dentry->d_name, 0, NULL);
 	err = PTR_ERR(inode);
 	if (IS_ERR(inode))
 		goto out_stop;
-- 
1.7.2.3

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