KATO Takenori 81bca6ddae 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		1997-09-27 13:40:20 +00:00
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cd9660	Clustered read and write are switched at mount-option level.	1997-09-27 13:40:20 +00:00
deadfs	Convert select -> poll.	1997-09-14 02:58:12 +00:00
fdescfs	Convert select -> poll.	1997-09-14 02:58:12 +00:00
fifofs	Convert select -> poll.	1997-09-14 02:58:12 +00:00
msdosfs	Change the M_NAMEI allocations to use the zone allocator. This change	1997-09-21 04:24:27 +00:00
nullfs	Executing binaries on a nullfs (or nullfs-based) filesystem results in	1997-09-18 18:33:23 +00:00
portalfs	Convert select -> poll.	1997-09-14 02:58:12 +00:00
procfs	Change the M_NAMEI allocations to use the zone allocator. This change	1997-09-21 04:24:27 +00:00
specfs	Clustered read and write are switched at mount-option level.	1997-09-27 13:40:20 +00:00
umapfs	Executing binaries on a nullfs (or nullfs-based) filesystem results in	1997-09-18 18:33:23 +00:00
unionfs	Clustered read and write are switched at mount-option level.	1997-09-27 13:40:20 +00:00