Implement Filelock

LICENSE

@@ -8564,3 +8564,72 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+include/search.h
+======================
+$NetBSD: search.h,v 1.12 1999/02/22 10:34:28 christos Exp $
+$FreeBSD: src/include/search.h,v 1.4 2002/03/23 17:24:53 imp Exp $
+
+Written by J.T. Conklin <[email protected]>
+Public domain.
+
+libs/libc/search/hcreate.c
+libs/libc/search/hcreate_r.c
+======================
+$NetBSD: hcreate.c,v 1.2 2001/02/19 21:26:04 ross Exp $
+
+Copyright (c) 2001 Christopher G. Demetriou
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. The name of the author may not be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+libs/libc/search/hash_func.c
+======================
+Copyright (c) 1990, 1993
+The Regents of the University of California.  All rights reserved.
+
+This code is derived from software contributed to Berkeley by
+Margo Seltzer.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of the University nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.

fs/Kconfig

@@ -64,6 +64,10 @@ config FS_NEPOLL_DESCRIPTORS
 	---help---
 		The maximum number of default epoll descriptors for epoll_create1(2)
 
+config FS_LOCK_BUCKET_SIZE
+	int "Maximum number of hash bucket using file locks"
+	default 0
+
 config DISABLE_PSEUDOFS_OPERATIONS
 	bool "Disable pseudo-filesystem operations"
 	default DEFAULT_SMALL

fs/fs_initialize.c

@@ -29,6 +29,7 @@
 #include "rpmsgfs/rpmsgfs.h"
 #include "inode/inode.h"
 #include "aio/aio.h"
+#include "vfs/lock.h"
 
 /****************************************************************************
  * Private Functions
@@ -83,6 +84,8 @@ void fs_initialize(void)
 
   inode_initialize();
 
+  file_initlk();
+
 #ifdef CONFIG_FS_AIO
   /* Initialize for asynchronous I/O */
 

fs/vfs/CMakeLists.txt

@@ -48,6 +48,12 @@ set(SRCS
     fs_fsync.c
     fs_truncate.c)
 
+# File lock support
+
+if(NOT "${CONFIG_FS_LOCK_BUCKET_SIZE}" STREQUAL "0")
+  list(APPEND SRCS fs_lock.c)
+endif()
+
 # Certain interfaces are not available if there is no mountpoint support
 
 if(NOT "${CONFIG_PSEUDOFS_SOFTLINKS}" STREQUAL "0")

fs/vfs/Make.defs

@@ -29,6 +29,10 @@ CSRCS += fs_syncfs.c fs_truncate.c
 
 # Certain interfaces are not available if there is no mountpoint support
 
+ifneq ($(CONFIG_FS_LOCK_BUCKET_SIZE),0)
+CSRCS += fs_lock.c
+endif
+
 ifneq ($(CONFIG_PSEUDOFS_SOFTLINKS),0)
 CSRCS += fs_link.c fs_symlink.c fs_readlink.c
 endif

fs/vfs/fs_close.c

@@ -32,6 +32,7 @@
 #include <nuttx/fs/fs.h>
 
 #include "inode/inode.h"
+#include "vfs/lock.h"
 
 /****************************************************************************
  * Public Functions
@@ -65,6 +66,8 @@ int file_close(FAR struct file *filep)
 
   if (inode)
     {
+      file_closelk(filep);
+
       /* Close the file, driver, or mountpoint. */
 
       if (inode->u.i_ops && inode->u.i_ops->close)

fs/vfs/fs_fcntl.c

@@ -35,6 +35,7 @@
 #include <nuttx/fs/fs.h>
 
 #include "inode/inode.h"
+#include "lock.h"
 
 /****************************************************************************
  * Private Functions
@@ -195,6 +196,12 @@ static int file_vfcntl(FAR struct file *filep, int cmd, va_list ap)
          * for the lock type which shall be set to F_UNLCK.
          */
 
+        {
+          FAR struct flock *flock = va_arg(ap, FAR struct flock *);
+          ret = file_getlk(filep, flock);
+        }
+
+        break;
       case F_SETLK:
         /* Set or clear a file segment lock according to the lock
          * description pointed to by the third argument, arg, taken as a
@@ -206,6 +213,12 @@ static int file_vfcntl(FAR struct file *filep, int cmd, va_list ap)
          * shall return immediately with a return value of -1.
          */
 
+        {
+          FAR struct flock *flock = va_arg(ap, FAR struct flock *);
+          ret = file_setlk(filep, flock, true);
+        }
+
+        break;
       case F_SETLKW:
         /* This command shall be equivalent to F_SETLK except that if a
          * shared or exclusive lock is blocked by other locks, the thread
@@ -216,9 +229,12 @@ static int file_vfcntl(FAR struct file *filep, int cmd, va_list ap)
          * the lock operation shall not be done.
          */
 
-        ret = -ENOSYS; /* Not implemented */
-        break;
+        {
+          FAR struct flock *flock = va_arg(ap, FAR struct flock *);
+          ret = file_setlk(filep, flock, false);
+        }
 
+        break;
       case F_GETPATH:
         /* Get the path of the file descriptor. The argument must be a buffer
          * of size PATH_MAX or greater.