Add VFS ops for Windows BRL: Lock, Unlock and Cancel:

This patch adds 3 new VFS OPs for Windows byte range locking: BRL_LOCK_WINDOWS,
BRL_UNLOCK_WINDOWS and BRL_CANCEL_WINDOWS. Specifically:

* I renamed brl_lock_windows, brl_unlock_windows and brl_lock_cancel to
  *_default as the default implementations of the VFS ops.
* The blocking_lock_record (BLR) is now passed into the brl_lock_windows and
  brl_cancel_windows paths. The Onefs implementation uses it - future
  implementations may find it useful too.
* Created brl_lock_cancel to do what brl_lock/brl_unlock do: set up a
  lock_struct and call either the Posix or Windows lock function. These happen
  to be the same for the default implementation.
* Added helper functions: increment_current_lock_count() and
  decrement_current_lock_count().
* Minor spelling correction in brl_timeout_fn: brl -> blr.
* Changed blocking_lock_cancel() to return the BLR that it has cancelled. This
  allows us to assert its the lock that we wanted to cancel. If this assert ever
  fires, this path will need to take in the BLR to cancel, rather than choosing
  on its own.
* Adds a small helper function: find_blocking_lock_record_by_id(). Used by the
  OneFS implementation, but could be useful for others.

1 files changed, 9 insertions, 0 deletions

diff --git a/source3/include/vfs_macros.h b/source3/include/vfs_macros.h
index e57cbd2538..dcef63da86 100644
--- a/source3/include/vfs_macros.h
+++ b/source3/include/vfs_macros.h
@@ -88,6 +88,9 @@
 #define SMB_VFS_FILE_ID_CREATE(conn, dev, inode) ((conn)->vfs.ops.file_id_create((conn)->vfs.handles.file_id_create, (dev), (inode)))
 #define SMB_VFS_STREAMINFO(conn, fsp, fname, mem_ctx, num_streams, streams) ((conn)->vfs.ops.streaminfo((conn)->vfs.handles.streaminfo, (fsp), (fname), (mem_ctx), (num_streams), (streams)))
 #define SMB_VFS_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name) ((conn)->vfs.ops.get_real_filename((conn)->vfs.handles.get_real_filename, (path), (name), (mem_ctx), (found_name)))
+#define SMB_VFS_BRL_LOCK_WINDOWS(conn, br_lck, plock, blocking_lock, blr) ((conn)->vfs.ops.brl_lock_windows((conn)->vfs.handles.brl_lock_windows, (br_lck), (plock), (blocking_lock), (blr)))
+#define SMB_VFS_BRL_UNLOCK_WINDOWS(conn, msg_ctx, br_lck, plock) ((conn)->vfs.ops.brl_unlock_windows((conn)->vfs.handles.brl_unlock_windows, (msg_ctx), (br_lck), (plock)))
+#define SMB_VFS_BRL_CANCEL_WINDOWS(conn, br_lck, plock, blr) ((conn)->vfs.ops.brl_cancel_windows((conn)->vfs.handles.brl_cancel_windows, (br_lck), (plock), (blr)))
 
 /* NT ACL operations. */
 #define SMB_VFS_FGET_NT_ACL(fsp, security_info, ppdesc) ((fsp)->conn->vfs.ops.fget_nt_acl((fsp)->conn->vfs.handles.fget_nt_acl, (fsp), (security_info), (ppdesc)))
@@ -217,6 +220,9 @@
 #define SMB_VFS_OPAQUE_FILE_ID_CREATE(conn, dev, inode) ((conn)->vfs.ops_opaque.file_id_create((conn)->vfs_opaque.handles.file_id_create, (dev), (inode)))
 #define SMB_VFS_OPAQUE_STREAMINFO(conn, fsp, fname, mem_ctx, num_streams, streams) ((conn)->vfs_opaque.ops.streaminfo((conn)->vfs_opaque.handles.streaminfo, (fsp), (fname), (mem_ctx), (num_streams), (streams)))
 #define SMB_VFS_OPAQUE_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name) ((conn)->vfs_opaque.ops.get_real_filename((conn)->vfs_opaque.handles.get_real_filename, (path), (name), (mem_ctx), (found_name)))
+#define SMB_VFS_OPAQUE_BRL_LOCK_WINDOWS(conn, br_lck, plock, blocking_lock, blr) ((conn)->vfs_opaque.ops.brl_lock_windows((conn)->vfs_opaque.handles.brl_lock_windows, (br_lck), (plock), (blocking_lock), (blr)))
+#define SMB_VFS_OPAQUE_BRL_UNLOCK_WINDOWS(conn, msg_ctx, br_lck, plock) ((conn)->vfs_opaque.ops.brl_unlock_windows((conn)->vfs_opaque.handles.brl_unlock_windows, (msg_ctx), (br_lck), (plock)))
+#define SMB_VFS_OPAQUE_BRL_CANCEL_WINDOWS(conn, br_lck, plock, blr) ((conn)->vfs_opaque.ops.brl_cancel_windows((conn)->vfs_opaque.handles.brl_cancel_windows, (br_lck), (plock), (blr)))
 
 /* NT ACL operations. */
 #define SMB_VFS_OPAQUE_FGET_NT_ACL(fsp, security_info, ppdesc) ((fsp)->conn->vfs_opaque.ops.fget_nt_acl((fsp)->conn->vfs_opaque.handles.fget_nt_acl, (fsp), (security_info), (ppdesc)))
@@ -347,6 +353,9 @@
 #define SMB_VFS_NEXT_FILE_ID_CREATE(handle, dev, inode) ((handle)->vfs_next.ops.file_id_create((handle)->vfs_next.handles.file_id_create, (dev), (inode)))
 #define SMB_VFS_NEXT_STREAMINFO(handle, fsp, fname, mem_ctx, num_streams, streams) ((handle)->vfs_next.ops.streaminfo((handle)->vfs_next.handles.streaminfo, (fsp), (fname), (mem_ctx), (num_streams), (streams)))
 #define SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name, mem_ctx, found_name) ((handle)->vfs_next.ops.get_real_filename((handle)->vfs_next.handles.get_real_filename, (path), (name), (mem_ctx), (found_name)))
+#define SMB_VFS_NEXT_BRL_LOCK_WINDOWS(handle, br_lck, plock, blocking_lock, blr) ((handle)->vfs_next.ops.brl_lock_windows((handle)->vfs_next.handles.brl_lock_windows, (br_lck), (plock), (blocking_lock), (blr)))
+#define SMB_VFS_NEXT_BRL_UNLOCK_WINDOWS(handle, msg_ctx, br_lck, plock) ((handle)->vfs_next.ops.brl_unlock_windows((handle)->vfs_next.handles.brl_unlock_windows, (msg_ctx), (br_lck), (plock)))
+#define SMB_VFS_NEXT_BRL_CANCEL_WINDOWS(handle, br_lck, plock, blr) ((handle)->vfs_next.ops.brl_cancel_windows((handle)->vfs_next.handles.brl_cancel_windows, (br_lck), (plock), (blr)))
 
 /* NT ACL operations. */
 #define SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info, ppdesc) ((handle)->vfs_next.ops.fget_nt_acl((handle)->vfs_next.handles.fget_nt_acl, (fsp), (security_info), (ppdesc)))