[PATCH v2 0/4] ubifs: Add overlayfs support

[Richard Weinberger]

To support overlayfs in a proper way a filesystem has to offer support
for DT_CHR, RENAME_WHITEOUT and RENAME_EXCHANGE.
While UBIFS supports DT_CHR it lacks support for RENAME_WHITEOUT and
RENAME_EXCHANGE. This patch series implement the missing bits.
RENAME_WHITEOUT itself depends on O_TMPFILE, therefore O_TMPFILE is now
also supported.

Changes since v1:
 - Build fix for CONFIG_LOCKDEP=y
 - Fix for wrong dentry name length calculation in ubifs_jnl_xrename()
 - Fix for wrong directory link count after RENAME_EXCHANGE

Richard Weinberger (4):
  ubifs: Implement O_TMPFILE
  ubifs: Implement RENAME_WHITEOUT
  ubifs: Implement RENAME_EXCHANGE
  ubifs: Use move variable in ubifs_rename()

 fs/ubifs/dir.c     | 242 +++++++++++++++++++++++++++++++++++++++++++++++++----
 fs/ubifs/journal.c | 188 +++++++++++++++++++++++++++++++++++++----
 fs/ubifs/ubifs.h   |   8 +-
 3 files changed, 404 insertions(+), 34 deletions(-)

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2.7.3