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hannken 1b9c6382e3 New file system suspension API to replace vn_start_write and vn_finished_write. 
The suspension helpers are now put into file system specific operations.
This means every file system not supporting these helpers cannot be suspended
and therefore snapshots are no longer possible.

Implemented for file systems of type ffs.

The new API is enabled on a kernel option NEWVNGATE.  This option is
not enabled by default in any kernel config.

Presented and discussed on tech-kern with much input from
Bill Studenmund <wrstuden@netbsd.org> and YAMAMOTO Takashi <yamt@netbsd.org>.

Welcome to 4.99.9 (new vfs op vfs_suspendctl).
 		2007-01-19 14:49:08 +00:00
..
TODO Audit kqueue notifications. The reference behavior is taken from MFS and 2006-11-09 15:06:03 +00:00
files.tmpfs merge ktrace-lwp. 2005-12-11 12:16:03 +00:00
tmpfs.h Fix typo in comment. 2006-11-13 11:47:37 +00:00
tmpfs_fifoops.c merge ktrace-lwp. 2005-12-11 12:16:03 +00:00
tmpfs_fifoops.h - protect userland exported files against multiple inclusion. 2005-12-03 17:34:43 +00:00
tmpfs_pool.c Add 2006 to the copyright notice; should have done this when touching the 2006-11-09 16:20:06 +00:00
tmpfs_pool.h Add 2006 to the copyright notice; should have done this when touching the 2006-11-09 16:20:06 +00:00
tmpfs_specops.c merge ktrace-lwp. 2005-12-11 12:16:03 +00:00
tmpfs_specops.h - protect userland exported files against multiple inclusion. 2005-12-03 17:34:43 +00:00
tmpfs_subr.c Consistent usage of KAUTH_GENERIC_ISSUSER. 2007-01-04 15:42:37 +00:00
tmpfs_vfsops.c New file system suspension API to replace vn_start_write and vn_finished_write. 2007-01-19 14:49:08 +00:00
tmpfs_vnops.c Consistent usage of KAUTH_GENERIC_ISSUSER. 2007-01-04 15:42:37 +00:00
tmpfs_vnops.h Add 2006 to the copyright notice; should have done this when touching the 2006-11-09 16:20:06 +00:00