src/sys/miscfs, branch releng/12.4

- FDESC, FIFO, NULL, PORTAL, PROC, UMAP and UNION file

2001-05-23T09:42:29Z

systems were repo-copied from sys/miscfs to sys/fs. - Renamed the following file systems and their modules: fdesc -> fdescfs, portal -> portalfs, union -> unionfs. - Renamed corresponding kernel options: FDESC -> FDESCFS, PORTAL -> PORTALFS, UNION -> UNIONFS. - Install header files for the above file systems. - Removed bogus -I${.CURDIR}/../../sys CFLAGS from userland Makefiles.

Sort includes from previous commit.

2001-05-21T23:19:50Z

Introduce a global lock for the vm subsystem (vm_mtx).

2001-05-19T01:28:09Z

vm_mtx does not recurse and is required for most low level vm operations. faults can not be taken without holding Giant. Memory subsystems can now call the base page allocators safely. Almost all atomic ops were removed as they are covered under the vm mutex. Alpha and ia64 now need to catch up to i386's trap handlers. FFS and NFS have been tested, other filesystems will need minor changes (grabbing the vm lock when twiddling page properties). Reviewed (partially) by: jake, jhb

Currently there is no way to tell if write operation invoked via

2001-05-18T07:43:13Z

vn_start_write() on the given vnode will be successful. VOP_LEASE() may help to solve this problem, but its return value ignored nearly everywhere. For now just assume that the missing upper layer on write means insufficient access rights (which is correct for most cases).

VOP getwritemount() can be invoked on vnodes with VFREE flag set (used in

2001-05-17T04:58:25Z

snapshots code). At this point upper vp may not exist.

Use vop_*vobject() VOPs to get reference to VM object from upper or lower fs.

2001-05-17T04:52:57Z

Do not leave an extra reference on vnode.

2001-05-17T04:40:01Z

PR: kern/27250 Submitted by: "Vladimir B. Grebenschikov" MFC after: 2 weeks

Change the second argument of vflush() to an integer that specifies

2001-05-16T18:04:37Z

the number of references on the filesystem root vnode to be both expected and released. Many filesystems hold an extra reference on the filesystem root vnode, which must be accounted for when determining if the filesystem is busy and then released if it isn't busy. The old `skipvp' approach required individual filesystem xxx_unmount functions to re-implement much of vflush()'s logic to deal with the root vnode. All 9 filesystems that hold an extra reference on the root vnode got the logic wrong in the case of forced unmounts, so `umount -f' would always fail if there were any extra root vnode references. Fix this issue centrally in vflush(), now that we can. This commit also fixes a vnode reference leak in devfs, which could result in idle devfs filesystems that refuse to unmount. Reviewed by: phk, bp

GC prototype for procfs_bmap() missed during a previous commit.

2001-05-11T23:37:37Z

Implement vop_std{get|put}pages() and add them to the default vop[].

2001-05-01T08:34:45Z

Un-copy&paste all the VOP_{GET|PUT}PAGES() functions which do nothing but the default.