Added set_flags() support where needed. devfs now uses the ioctl() mechanism

via B_SET_(NON)BLOCKING_IO to notify the device about any access mode changes.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9199 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/core/fs/bootfs.c

@@ -977,6 +977,7 @@ file_system_info gBootFileSystem = {
 
 	/* common */
 	&bootfs_ioctl,
+	NULL,	// set_flags
 	&bootfs_fsync,
 
 	NULL,	// read_link

src/kernel/core/fs/devfs.cpp

@@ -1138,6 +1138,22 @@ devfs_ioctl(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, ulong op, void *b
 }
 
 
+static status_t
+devfs_set_flags(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, int flags)
+{
+	struct devfs_vnode *vnode = (struct devfs_vnode *)_vnode;
+	struct devfs_cookie *cookie = (struct devfs_cookie *)_cookie;
+
+	// we need to pass the O_NONBLOCK flag to the underlying device
+
+	if (!S_ISCHR(vnode->stream.type))
+		return B_NOT_ALLOWED;
+
+	return vnode->stream.u.dev.info->control(cookie->u.dev.dcookie, flags & O_NONBLOCK ?
+		B_SET_NONBLOCKING_IO : B_SET_BLOCKING_IO, NULL, 0);
+}
+
+
 static bool
 devfs_can_page(fs_volume _fs, fs_vnode _vnode, fs_cookie cookie)
 {
@@ -1360,6 +1376,7 @@ file_system_info gDeviceFileSystem = {
 
 	/* common */
 	&devfs_ioctl,
+	&devfs_set_flags,
 	&devfs_fsync,
 
 	NULL,	// read_link

src/kernel/core/fs/pipefs.cpp

@@ -1289,6 +1289,16 @@ pipefs_ioctl(fs_volume _volume, fs_vnode _vnode, fs_cookie _cookie, ulong op,
 }
 
 
+static status_t
+pipefs_set_flags(fs_volume _volume, fs_vnode _vnode, fs_cookie _cookie, int flags)
+{
+	file_cookie *cookie = (file_cookie *)_cookie;
+
+	cookie->open_mode = (cookie->open_mode & ~(O_APPEND | O_NONBLOCK)) | flags;
+	return B_OK;
+}
+
+
 static bool
 pipefs_can_page(fs_volume _volume, fs_vnode _v, fs_cookie cookie)
 {
@@ -1432,6 +1442,7 @@ file_system_info gPipeFileSystem = {
 
 	/* common */
 	&pipefs_ioctl,
+	&pipefs_set_flags,
 	&pipefs_fsync,
 
 	NULL,	// fs_read_link()

src/kernel/core/fs/rootfs.c

@@ -1021,6 +1021,7 @@ file_system_info gRootFileSystem = {
 
 	/* common */
 	&rootfs_ioctl,
+	NULL,	// fs_set_flags()
 	&rootfs_fsync,
 
 	&rootfs_read_link,