[NaCl SDK] nacl_io: Add chmod/fchmod

[NaCl SDK] nacl_io: Add chmod/fchmod

This change includes implementation for MemFs and FuseFs.

I've also reordered the fuse_operations struct to match the order used in the
real FUSE implementation.

BUG=414793
R=sbc@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/a4ef3a9c60553b3bcc8708587ea7832fc7cac29e

[Sam Clegg, 2014-09-24 20:48:28]

lgtm

https://codereview.chromium.org/604513002/diff/1/native_client_sdk/src/librar...
File native_client_sdk/src/libraries/nacl_io/dir_node.cc (right):

https://codereview.chromium.org/604513002/diff/1/native_client_sdk/src/librar...
native_client_sdk/src/libraries/nacl_io/dir_node.cc:75: return 0;
Could we not just put this in the Nade base class?

https://codereview.chromium.org/604513002/diff/1/native_client_sdk/src/librar...
File native_client_sdk/src/libraries/nacl_io/fuse.h (right):

https://codereview.chromium.org/604513002/diff/1/native_client_sdk/src/librar...
native_client_sdk/src/libraries/nacl_io/fuse.h:11: // These interfaces are
copied from the FUSE library.
We should probably convert these to C-style comments given that this file can be
used in C programs, but thats a different CL i guess.

[binji, 2014-09-24 21:30:50]

https://codereview.chromium.org/604513002/diff/1/native_client_sdk/src/librar...
File native_client_sdk/src/libraries/nacl_io/dir_node.cc (right):

https://codereview.chromium.org/604513002/diff/1/native_client_sdk/src/librar...
native_client_sdk/src/libraries/nacl_io/dir_node.cc:75: return 0;
On 2014/09/24 20:48:28, Sam Clegg wrote:
> Could we not just put this in the Nade base class?

I thought about that. It made more sense to me to "opt-in" to supporting fchmod,
considering that some filesystems don't use the built-in stat_ at all. Having it
default to setting the node seemed weird.

https://codereview.chromium.org/604513002/diff/1/native_client_sdk/src/librar...
File native_client_sdk/src/libraries/nacl_io/fuse.h (right):

https://codereview.chromium.org/604513002/diff/1/native_client_sdk/src/librar...
native_client_sdk/src/libraries/nacl_io/fuse.h:11: // These interfaces are
copied from the FUSE library.
On 2014/09/24 20:48:28, Sam Clegg wrote:
> We should probably convert these to C-style comments given that this file can
be
> used in C programs, but thats a different CL i guess.

Acknowledged.

[commit-bot: I haz the power, 2014-09-25 00:16:38]

Patchset 1 (id:??) landed as
https://crrev.com/a4ef3a9c60553b3bcc8708587ea7832fc7cac29e
Cr-Commit-Position: refs/heads/master@{#296588}

[binji, 2014-09-25 00:46:58]

Committed patchset #1 (id:1) manually as a4ef3a9 (presubmit successful).