isofs: let mode and dmode mount options override rock ridge mode setting

So far, permissions set via 'mode' and/or 'dmode' mount options were
effective only if the medium had no rock ridge extensions (or was mounted
without them).  Add 'overriderockmode' mount option to indicate that these
options should override permissions set in rock ridge extensions.  Maybe
this should be default but the current behavior is there since mount
options were created so I think we should not change how they behave.

Cc: <Hans-Joachim.Baader@cjt.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/Documentation/filesystems/isofs.txt b/Documentation/filesystems/isofs.txt
index 6973b980ca2a..3c367c3b3608 100644
--- a/Documentation/filesystems/isofs.txt
+++ b/Documentation/filesystems/isofs.txt
@@ -23,8 +23,13 @@ Mount options unique to the isofs filesystem.
   map=off       Do not map non-Rock Ridge filenames to lower case
   map=normal    Map non-Rock Ridge filenames to lower case
   map=acorn     As map=normal but also apply Acorn extensions if present
-  mode=xxx      Sets the permissions on files to xxx
-  dmode=xxx     Sets the permissions on directories to xxx
+  mode=xxx      Sets the permissions on files to xxx unless Rock Ridge
+                extensions set the permissions otherwise
+  dmode=xxx     Sets the permissions on directories to xxx unless Rock Ridge
+                extensions set the permissions otherwise
+  overriderockperm Set permissions on files and directories according to
+                'mode' and 'dmode' even though Rock Ridge extensions are
+                present.
   nojoliet      Ignore Joliet extensions if they are present.
   norock        Ignore Rock Ridge extensions if they are present.
   hide          Completely strip hidden files from the file system.