ext4: fix quota accounting during migration

The tmp_inode should have same uid/gid as the original inode.
Otherwise new metadata blocks will be accounted to wrong quota-id,
which will result in a quota leak after the inode migration is
completed.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

4 files changed, 17 insertions, 10 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 3647ae0b21ab..657e82649fa5 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1811,7 +1811,8 @@ 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 e007fecdaedc..acdde93b74d7 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -691,7 +691,7 @@ 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;
@@ -852,8 +852,11 @@ 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 8a9a0912fdae..f729377bf043 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -439,6 +439,7 @@ 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
@@ -466,10 +467,12 @@ 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 4a550aa07614..f73d582e89f9 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1754,7 +1754,7 @@ 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;
@@ -1790,7 +1790,7 @@ 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);
@@ -1830,7 +1830,7 @@ 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;
@@ -2277,7 +2277,7 @@ 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;