fs: add symlink and readlink support

HI,

v5:
fix rmdir
fix test -L

v4:
drop the mounted path added to absolute symlink

v3:
- fix support
mkdir mymount
mount -t ramfs none mymount/
ln /env/boot/net /mymount/link

- addres comments

v2:
addres comments

please pull
The following changes since commit 5b1583d994c0e63b4588a75b631011e2bf41bab8:

nhk8815: fix nand IO_DATA end resource (2012-09-03 11:06:49 +0200)

are available in the git repository at:

git://git.jcrosoft.org/barebox.git tags/fs-symlink

for you to fetch changes up to b65e60792376bb209adfa128e1783cf67af9f13b:

defautenv: add support of symlink (2012-09-05 03:22:14 +0800)

----------------------------------------------------------------
fs: add symlink and readlink support

This patch series introduce the support of symlink and readlink at

1) vfs level

2) libc API
- symlink
- readlink

3) commands
- ln
- readlink

3) filesystem
- ramfs
- nfs
- envfs

----------------------------------------------------------------
Jean-Christophe PLAGNIOL-VILLARD (19):
fs: add readlink support
fs: fix rmdir with symlink
fs: rename stat to lstat as we implement lstat
fs: add symlink support
fs: implement stat
fs: open: add symlink support
fs: introduce get_mounted_path to get the path where a file is mounted
ramfs: add symlink and readlink support
nfs: add readlink support
test: add -L support to test if it's a symbolic link
command: add readlink support
command: add ln support
ls: add symlink support to -l
dirname: add -V option to return only path related to the mountpoint
recursive_action: add ACTION_FOLLOWLINKS support
envfs: introduce version major and minor
envfs: add support of variable inode size
envfs: add support of symlink
defautenv: add support of symlink

 MAKEALL                |    1 +
 commands/Kconfig       |   10 ++++++++
 commands/Makefile      |    2 ++
 commands/dirname.c     |   24 +++++++++++++++---
 commands/ln.c          |   51 ++++++++++++++++++++++++++++++++++++++
 commands/ls.c          |   31 +++++++++++++++--------
 commands/readlink.c    |   80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 commands/test.c        |   11 +++++++--
 common/Makefile        |    2 +-
 common/environment.c   |  150 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------
 fs/fs.c                |  229 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------
 fs/nfs.c               |   86 ++++++++++++++++++++++++++++++++++++++++++---------------------
 fs/ramfs.c             |   61 ++++++++++++++++++++++++++++++++++++++++-----
 include/envfs.h        |   15 +++++++++--
 include/fs.h           |   12 +++++++++
 include/libbb.h        |    2 +-
 lib/recursive_action.c |    7 +++++-
 scripts/bareboxenv.c   |    2 +-
 18 files changed, 676 insertions(+), 100 deletions(-)
 create mode 100644 commands/ln.c
 create mode 100644 commands/readlink.c

Best Regards,
J.

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