More class/struct mixup fixes.

Spotted by Clang.

nfs4: support hard links properly

The main purpose of this patch is to prevent VFS from removing a vnode to early
what might have happened if the NFS client knew it had more than one name but
then one of them was deleted. Moreover, all discovered and still valid names
are stored what may be useful in proper file handle recovery when they are
volatile.

This patch fixes both #9558 and #9561.

nfs4: Fix wrong parenthesising in ReplyInterpreter::_FlattenPathname

This patch solves CID 990966.

nfs4: Add attribute directory related hooks

nfs4: Return delegations when asked to

nfs4: Use global open owner, check whether delegation was granted

nfs4: Use unstable writes and commit before close

nfs4: Fix several issues introduced in previous commits

nfs4: Do not let local changes invalidate cache

nfs4: Rename Filehandle to FileHandle and Filesystem to FileSystem

nfs4: Move file handle recovery code out of Inode class

nfs4: Allow the server to release unused lock owners

nfs4: Add proper lock owners management

nfs4: Add support for file locking

nfs4: Add write_stat() hook

nfs4: Fix removing nodes other than NF4DIR or NF4REG

nfs4: Improve handling errors in NFS replies

nfs4: Add write() hook

nfs4: Add create_symlink() hook

nfs4: Add link() hook

nfs4: unlink() and remove_dir() should check node type

nfs4: Add unlink() and remove_dir() hooks

nfs4: Add rename() hook

nfs4: close*() should wake all blocked operations

nfs4: Add support for server migration

nfs4: Let ReplyInterpreter provide original NFS4 error codes

nfs4: Add read_symlink() hook

nfs4: Renew all owned and used leases

nfs4: Let stat() retrieve access, change, etc dates

nfs4: Add Request class for better handling of NFS4 requests

nfs4: Add close() and free_cookie() hooks

nfs4: Add read() hook

nfs4: Add open() hook

nfs4: Add lookup() and get_vnode() hooks

get_vnode() needs a way to retrieve filehandle knowing only inode number.
Since NFS4 sever does not provide such services client manages its own mapping
between ino_t and filehandles.

nfs4: Add read_dir() hook

nfs4: Add stub Inode class, fix and extend Filesystem class

Additionally PUTFH support is added to both RequestBuilder and
ReplyInterpreter.

nfs4: Add NFS4 reply interpreter

Currently supported operations are: ACCESS, GETATTR (partially), GETFH,
LOOKUP and PUTROOTFH.

nfs4: support hard links properly

The main purpose of this patch is to prevent VFS from removing a vnode to early
what might have happened if the NFS client knew it had more than one name but
then one of them was deleted. Moreover, all discovered and still valid names
are stored what may be useful in proper file handle recovery when they are
volatile.

This patch fixes both #9558 and #9561.

nfs4: Fix wrong parenthesising in ReplyInterpreter::_FlattenPathname

This patch solves CID 990966.

nfs4: Add attribute directory related hooks

nfs4: Return delegations when asked to

nfs4: Use global open owner, check whether delegation was granted

nfs4: Use unstable writes and commit before close

nfs4: Fix several issues introduced in previous commits

nfs4: Do not let local changes invalidate cache

nfs4: Rename Filehandle to FileHandle and Filesystem to FileSystem

nfs4: Move file handle recovery code out of Inode class

nfs4: Allow the server to release unused lock owners

nfs4: Add proper lock owners management

nfs4: Add support for file locking

nfs4: Add write_stat() hook

nfs4: Fix removing nodes other than NF4DIR or NF4REG

nfs4: Improve handling errors in NFS replies

nfs4: Add write() hook

nfs4: Add create_symlink() hook

nfs4: Add link() hook

nfs4: unlink() and remove_dir() should check node type

nfs4: Add unlink() and remove_dir() hooks

nfs4: Add rename() hook

nfs4: close*() should wake all blocked operations

nfs4: Add support for server migration

nfs4: Let ReplyInterpreter provide original NFS4 error codes

nfs4: Add read_symlink() hook

nfs4: Renew all owned and used leases

nfs4: Let stat() retrieve access, change, etc dates

nfs4: Add Request class for better handling of NFS4 requests

nfs4: Add close() and free_cookie() hooks

nfs4: Add read() hook

nfs4: Add open() hook

nfs4: Add lookup() and get_vnode() hooks

get_vnode() needs a way to retrieve filehandle knowing only inode number.
Since NFS4 sever does not provide such services client manages its own mapping
between ino_t and filehandles.

nfs4: Add read_dir() hook

nfs4: Add stub Inode class, fix and extend Filesystem class

Additionally PUTFH support is added to both RequestBuilder and
ReplyInterpreter.

nfs4: Add NFS4 reply interpreter

Currently supported operations are: ACCESS, GETATTR (partially), GETFH,
LOOKUP and PUTROOTFH.