FUSE compat: add Haiku extension

* Add a way for a FUSE module to supply Haiku-specific extensions.
This allows it to integrate better with Haiku while only requiring
minimal changes on the FUSE module itself.

* For now, there is only one extension: another function pointer for
"get_fs_info", which lets the FUSE module fill in an fs_info struct.
FUSE provides no good way to otherwise communicate extra information,
such as the volume flags (e.g. B_FS_IS_SHARED).

* A FUSE module can signal that it supports the Haiku extensions by
a) defining HAS_HAIKU_FUSE_EXTENSIONS before including the fuse
headers
b) setting the global variable gHasHaikuFuseExtensions to 1 in
its initialization
Otherwise, the Haiku extensions are completely invisible to the
FUSE module.

Parse the FUSE library options. They aren't used yet, though.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29844 a95241bf-73f2-0310-859d-f6bbb57e9c96

* More work on the file system initialization. Mounting/unmounting works now
with sshfs.
* Added basic node and entry management, which we need, since the FUSE
interface works with paths only, while our VFS plays with node IDs and
node cookies.
* Implemented most of the mandatory hooks (vnode operations, lookup, read stat,
open/close/read dir). I was hoping to get directory listings with sshfs now,
but as I had to find out, it implements the deprecated getdir() while we
only support the new {open,read,release}dir() interface yet.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29619 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added "fuse_api.h" header wrapping the inclusion of <fuse.h>.
* Implemented the fuse_fs_*() functions.
* More work on the initialization procedure for the client file system. We do
now start a separate thread which calls the main() function. It won't return
from fuse_main_real() until unmounting the FS. We create a fuse_fs structure
and call the client FS initialization and cleanup hooks.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29613 a95241bf-73f2-0310-859d-f6bbb57e9c96

Parse the FUSE library options. They aren't used yet, though.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29844 a95241bf-73f2-0310-859d-f6bbb57e9c96

* More work on the file system initialization. Mounting/unmounting works now
with sshfs.
* Added basic node and entry management, which we need, since the FUSE
interface works with paths only, while our VFS plays with node IDs and
node cookies.
* Implemented most of the mandatory hooks (vnode operations, lookup, read stat,
open/close/read dir). I was hoping to get directory listings with sshfs now,
but as I had to find out, it implements the deprecated getdir() while we
only support the new {open,read,release}dir() interface yet.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29619 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added "fuse_api.h" header wrapping the inclusion of <fuse.h>.
* Implemented the fuse_fs_*() functions.
* More work on the initialization procedure for the client file system. We do
now start a separate thread which calls the main() function. It won't return
from fuse_main_real() until unmounting the FS. We create a fuse_fs structure
and call the client FS initialization and cleanup hooks.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29613 a95241bf-73f2-0310-859d-f6bbb57e9c96