udf: Apply uid/gid mount options also to new inodes & chown

Currently newly created files belong to current user despite
uid=<number> / gid=<number> mount options. This is confusing to users
(as owner of the file will change after remount / eviction from cache)
and also inconsistent with e.g. FAT with the same mount option. So apply
uid=<number> and gid=<number> also to newly created inodes and similarly
as FAT disallow to change owner of the file in this case.

Reported-by: Steve Kenton <skenton@ou.edu>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c
index b6e420c1bfeb..b7a0d4b4bda1 100644
--- a/fs/udf/ialloc.c
+++ b/fs/udf/ialloc.c
@@ -104,6 +104,10 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode)
         }
 
         inode_init_owner(inode, dir, mode);
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
+                inode->i_uid = sbi->s_uid;
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
+                inode->i_gid = sbi->s_gid;
 
         iinfo->i_location.logicalBlockNum = block;
         iinfo->i_location.partitionReferenceNum =