Clustered read and write are switched at mount-option level.

1. Clustered I/O is switched by the MNT_NOCLUSTERR and MNT_NOCLUSTERW
   bits of the mnt_flag.  The sysctl variables, vfs.foo.doclusterread
   and vfs.foo.doclusterwrite are deleted.  Only mount option can
   control clustered I/O from userland.
2. When foofs_mount mounts block device, foofs_mount checks D_CLUSTERR
   and D_CLUSTERW bits of the d_flags member in the block device switch
   table.  If D_NOCLUSTERR / D_NOCLUSTERW are set, MNT_NOCLUSTERR /
   MNT_NOCLUSTERW bits will be set.  In this case, MNT_NOCLUSTERR and
   MNT_NOCLUSTERW cannot be cleared from userland.
3. Vnode driver disables both clustered read and write.
4. Union filesystem disables clutered write.

Reviewed by:	bde

1 files changed, 0 insertions, 13 deletions

diff --git a/sys/gnu/fs/ext2fs/ext2_extern.h b/sys/gnu/fs/ext2fs/ext2_extern.h
index 277106b..4c32799 100644
--- a/sys/gnu/fs/ext2fs/ext2_extern.h
+++ b/sys/gnu/fs/ext2fs/ext2_extern.h
@@ -42,19 +42,6 @@
 #ifndef _SYS_GNU_EXT2FS_EXT2_EXTERN_H_
 #define	_SYS_GNU_EXT2FS_EXT2_EXTERN_H_
 
-/*
- * Sysctl values for the ext2fs filesystem.
- */
-#define	EXT2FS_CLUSTERREAD		1		/* cluster reading enabled */
-#define	EXT2FS_CLUSTERWRITE		2		/* cluster writing enable */
-#define	EXT2FS_MAXID			3		/* number of valid ext2fs ids */
-
-#define	EXT2FS_NAMES {\
-	{0, 0}, \
-	{ "doclusterread", CTLTYPE_INT }, \
-	{ "doculsterwrite", CTLTYPE_INT }, \
-}
-
 struct dinode;
 struct ext2_inode;
 struct inode;