3 files changed, 33 insertions, 5 deletions

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 395e582ee542..d04cff2273b6 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1045,10 +1045,14 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
         }
 
         inode->i_uid = le32_to_cpu(fe->uid);
-        if ( inode->i_uid == -1 ) inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
+        if (inode->i_uid == -1 || UDF_QUERY_FLAG(inode->i_sb,
+                                        UDF_FLAG_UID_IGNORE))
+                inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
 
         inode->i_gid = le32_to_cpu(fe->gid);
-        if ( inode->i_gid == -1 ) inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
+        if (inode->i_gid == -1 || UDF_QUERY_FLAG(inode->i_sb,
+                                        UDF_FLAG_GID_IGNORE))
+                inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
 
         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
         if (!inode->i_nlink)
@@ -1335,10 +1339,14 @@ udf_update_inode(struct inode *inode, int do_sync)
                 return err;
         }
 
-        if (inode->i_uid != UDF_SB(inode->i_sb)->s_uid)
+        if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
+                fe->uid = cpu_to_le32(-1);
+        else if (inode->i_uid != UDF_SB(inode->i_sb)->s_uid)
                 fe->uid = cpu_to_le32(inode->i_uid);
 
-        if (inode->i_gid != UDF_SB(inode->i_sb)->s_gid)
+        if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
+                fe->gid = cpu_to_le32(-1);
+        else if (inode->i_gid != UDF_SB(inode->i_sb)->s_gid)
                 fe->gid = cpu_to_le32(inode->i_gid);
 
         udfperms =      ((inode->i_mode & S_IRWXO)     ) |
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 4a6f49adc609..368d8f81fe54 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -269,7 +269,7 @@ enum {
         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
         Opt_rootdir, Opt_utf8, Opt_iocharset,
-        Opt_err
+        Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
 };
 
 static match_table_t tokens = {
@@ -282,6 +282,10 @@ static match_table_t tokens = {
         {Opt_adinicb, "adinicb"},
         {Opt_shortad, "shortad"},
         {Opt_longad, "longad"},
+        {Opt_uforget, "uid=forget"},
+        {Opt_uignore, "uid=ignore"},
+        {Opt_gforget, "gid=forget"},
+        {Opt_gignore, "gid=ignore"},
         {Opt_gid, "gid=%u"},
         {Opt_uid, "uid=%u"},
         {Opt_umask, "umask=%o"},
@@ -414,6 +418,18 @@ udf_parse_options(char *options, struct udf_options *uopt)
                                 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
                                 break;
 #endif
+                        case Opt_uignore:
+                                uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
+                                break;
+                        case Opt_uforget:
+                                uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
+                                break;
+                        case Opt_gignore:
+                            uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
+                                break;
+                        case Opt_gforget:
+                            uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
+                                break;
                         default:
                                 printk(KERN_ERR "udf: bad mount option \"%s\" "
                                                 "or missing value\n", p);
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index 663669810be6..110f8d62616f 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -20,6 +20,10 @@
 #define UDF_FLAG_VARCONV                8
 #define UDF_FLAG_NLS_MAP                9
 #define UDF_FLAG_UTF8                   10
+#define UDF_FLAG_UID_FORGET     11    /* save -1 for uid to disk */
+#define UDF_FLAG_UID_IGNORE     12    /* use sb uid instead of on disk uid */
+#define UDF_FLAG_GID_FORGET     13
+#define UDF_FLAG_GID_IGNORE     14
 
 #define UDF_PART_FLAG_UNALLOC_BITMAP    0x0001
 #define UDF_PART_FLAG_UNALLOC_TABLE     0x0002