Handle IMNT_GONE on the file system we want suspended not its
lowest mount we really suspend.

Make mntvnode_lock per-mount, and address false sharing of struct mount.

Attach "mnt_transinfo" to "dead_rootmount" so every mount has a
valid "mnt_transinfo" and remove now unneeded flag IMNT_HAS_TRANS.

Run fstrans_start()/fstrans_done() on dead_rootmount if FSTRANS_DEAD_ENABLED.
Should become the default for DIAGNOSTIC in the future.

Bring back three state file system suspension:

NORMAL -> SUSPENDING -> SUSPENDED

and add operation fstrans_start_lazy() that only blocks while SUSPENDED.

Change vndthread() support operation handle_with_rdwr() to bracket
its file system operations by fstrans_start_lazy() and fstrans_done().

PR kern/53624 (dom0 freeze on domU exit)

branches: 1.7.2; 1.7.8; 1.7.10;
With dounmount() working on a suspended file system remove no longer
needed fields mnt_busynest and mnt_unmounting from struct mount.

Welcome to 7.99.73

Return ENOENT if trying to suspend an unmounted file system.

branches: 1.5.4;
Change last users of FSTRANS_LAZY to FSTRANS_SHARED and change
genfs_suspendctl() to move from FSTRANS_NORMAL to FSTRANS_SUSPENDED
and vice versa.

Add generic genfs_suspendctl() and use it for all file systems.
Layered file systems need work.

branches: 1.3.22; 1.3.40; 1.3.44; 1.3.48;
Introduce genfs_statvfs() as pretty much a no-info statvfs and
convert several pseudo file systems to use it.

Remove clause 3 and 4 from TNF licenses

branches: 1.1.2; 1.1.4; 1.1.10; 1.1.12; 1.1.14; 1.1.16;
Part of the rename patches *doh*

Make mntvnode_lock per-mount, and address false sharing of struct mount.

Attach "mnt_transinfo" to "dead_rootmount" so every mount has a
valid "mnt_transinfo" and remove now unneeded flag IMNT_HAS_TRANS.

Run fstrans_start()/fstrans_done() on dead_rootmount if FSTRANS_DEAD_ENABLED.
Should become the default for DIAGNOSTIC in the future.

Bring back three state file system suspension:

NORMAL -> SUSPENDING -> SUSPENDED

and add operation fstrans_start_lazy() that only blocks while SUSPENDED.

Change vndthread() support operation handle_with_rdwr() to bracket
its file system operations by fstrans_start_lazy() and fstrans_done().

PR kern/53624 (dom0 freeze on domU exit)

branches: 1.7.2; 1.7.8; 1.7.10;
With dounmount() working on a suspended file system remove no longer
needed fields mnt_busynest and mnt_unmounting from struct mount.

Welcome to 7.99.73

Return ENOENT if trying to suspend an unmounted file system.

branches: 1.5.4;
Change last users of FSTRANS_LAZY to FSTRANS_SHARED and change
genfs_suspendctl() to move from FSTRANS_NORMAL to FSTRANS_SUSPENDED
and vice versa.

Add generic genfs_suspendctl() and use it for all file systems.
Layered file systems need work.

branches: 1.3.22; 1.3.40; 1.3.44; 1.3.48;
Introduce genfs_statvfs() as pretty much a no-info statvfs and
convert several pseudo file systems to use it.

Remove clause 3 and 4 from TNF licenses

branches: 1.1.2; 1.1.4; 1.1.10; 1.1.12; 1.1.14; 1.1.16;
Part of the rename patches *doh*

Attach "mnt_transinfo" to "dead_rootmount" so every mount has a
valid "mnt_transinfo" and remove now unneeded flag IMNT_HAS_TRANS.

Run fstrans_start()/fstrans_done() on dead_rootmount if FSTRANS_DEAD_ENABLED.
Should become the default for DIAGNOSTIC in the future.

Bring back three state file system suspension:

NORMAL -> SUSPENDING -> SUSPENDED

and add operation fstrans_start_lazy() that only blocks while SUSPENDED.

Change vndthread() support operation handle_with_rdwr() to bracket
its file system operations by fstrans_start_lazy() and fstrans_done().

PR kern/53624 (dom0 freeze on domU exit)

branches: 1.7.2; 1.7.8;
With dounmount() working on a suspended file system remove no longer
needed fields mnt_busynest and mnt_unmounting from struct mount.

Welcome to 7.99.73

Return ENOENT if trying to suspend an unmounted file system.

branches: 1.5.4;
Change last users of FSTRANS_LAZY to FSTRANS_SHARED and change
genfs_suspendctl() to move from FSTRANS_NORMAL to FSTRANS_SUSPENDED
and vice versa.

Add generic genfs_suspendctl() and use it for all file systems.
Layered file systems need work.

branches: 1.3.22; 1.3.40; 1.3.44; 1.3.48;
Introduce genfs_statvfs() as pretty much a no-info statvfs and
convert several pseudo file systems to use it.

Remove clause 3 and 4 from TNF licenses

branches: 1.1.2; 1.1.4; 1.1.10; 1.1.12; 1.1.14; 1.1.16;
Part of the rename patches *doh*

With dounmount() working on a suspended file system remove no longer
needed fields mnt_busynest and mnt_unmounting from struct mount.

Welcome to 7.99.73

Return ENOENT if trying to suspend an unmounted file system.

branches: 1.5.4;
Change last users of FSTRANS_LAZY to FSTRANS_SHARED and change
genfs_suspendctl() to move from FSTRANS_NORMAL to FSTRANS_SUSPENDED
and vice versa.

Add generic genfs_suspendctl() and use it for all file systems.
Layered file systems need work.

branches: 1.3.44; 1.3.48;
Introduce genfs_statvfs() as pretty much a no-info statvfs and
convert several pseudo file systems to use it.

Remove clause 3 and 4 from TNF licenses

branches: 1.1.2; 1.1.4; 1.1.10; 1.1.12; 1.1.14; 1.1.16;
Part of the rename patches *doh*

Return ENOENT if trying to suspend an unmounted file system.

Change last users of FSTRANS_LAZY to FSTRANS_SHARED and change
genfs_suspendctl() to move from FSTRANS_NORMAL to FSTRANS_SUSPENDED
and vice versa.

Add generic genfs_suspendctl() and use it for all file systems.
Layered file systems need work.

branches: 1.3.44; 1.3.48;
Introduce genfs_statvfs() as pretty much a no-info statvfs and
convert several pseudo file systems to use it.

Remove clause 3 and 4 from TNF licenses

branches: 1.1.2; 1.1.4; 1.1.10; 1.1.12; 1.1.14; 1.1.16;
Part of the rename patches *doh*

Change last users of FSTRANS_LAZY to FSTRANS_SHARED and change
genfs_suspendctl() to move from FSTRANS_NORMAL to FSTRANS_SUSPENDED
and vice versa.

Add generic genfs_suspendctl() and use it for all file systems.
Layered file systems need work.

branches: 1.3.44; 1.3.48;
Introduce genfs_statvfs() as pretty much a no-info statvfs and
convert several pseudo file systems to use it.

Remove clause 3 and 4 from TNF licenses

branches: 1.1.2; 1.1.4; 1.1.10; 1.1.12; 1.1.14; 1.1.16;
Part of the rename patches *doh*