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Message-Id: <11972545383828-git-send-email-ezk@cs.sunysb.edu> Date: Sun, 9 Dec 2007 21:41:39 -0500 From: Erez Zadok <ezk@...sunysb.edu> To: hch@...radead.org, viro@....linux.org.uk, akpm@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, Erez Zadok <ezk@...sunysb.edu> Subject: [PATCH 06/42] Unionfs: documentation about renaming operations Signed-off-by: Erez Zadok <ezk@...sunysb.edu> --- Documentation/filesystems/unionfs/rename.txt | 31 ++++++++++++++++++++++++++ 1 files changed, 31 insertions(+), 0 deletions(-) create mode 100644 Documentation/filesystems/unionfs/rename.txt diff --git a/Documentation/filesystems/unionfs/rename.txt b/Documentation/filesystems/unionfs/rename.txt new file mode 100644 index 0000000..e20bb82 --- /dev/null +++ b/Documentation/filesystems/unionfs/rename.txt @@ -0,0 +1,31 @@ +Rename is a complex beast. The following table shows which rename(2) operations +should succeed and which should fail. + +o: success +E: error (either unionfs or vfs) +X: EXDEV + +none = file does not exist +file = file is a file +dir = file is a empty directory +child= file is a non-empty directory +wh = file is a directory containing only whiteouts; this makes it logically + empty + + none file dir child wh +file o o E E E +dir o E o E o +child X E X E X +wh o E o E o + + +Renaming directories: +===================== + +Whenever a empty (either physically or logically) directory is being renamed, +the following sequence of events should take place: + +1) Remove whiteouts from both source and destination directory +2) Rename source to destination +3) Make destination opaque to prevent anything under it from showing up + -- 1.5.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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