[PATCH 0/6] fs: implement tree and truncate

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Turn opendir inside out, so it uses directory fds internally.
This is an important change, because it means that the inode
iterate operation will now operate on a real struct file.

This is a prerequisite for porting 9pfs from Linux as it expects
directories to be openend before iteration.

To aid with future development of file systems, introduce a tree and
a truncate command on top.

Ahmad Fatoum (6):
  fs: use filename_create/filename_lookup instead of open-coding
  fs: implement O_DIRECTORY
  fs: implement opendir in terms of fdopendir
  commands: implement tree command
  commands: add new truncate command
  Documentation: devel: add short section on file systems

 Documentation/devel/background-execution.rst |   2 +
 Documentation/devel/devel.rst                |   1 +
 Documentation/devel/filesystems.rst          |  73 +++++++
 commands/Kconfig                             |  24 +++
 commands/Makefile                            |   2 +
 commands/stat.c                              |   2 +-
 commands/tree.c                              | 159 ++++++++++++++
 commands/truncate.c                          | 100 +++++++++
 fs/fs.c                                      | 207 +++++++------------
 include/dirent.h                             |   3 +-
 test/self/dirfd.c                            |  11 +-
 11 files changed, 438 insertions(+), 146 deletions(-)
 create mode 100644 Documentation/devel/filesystems.rst
 create mode 100644 commands/tree.c
 create mode 100644 commands/truncate.c

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2.39.5