Kirk McKusick f2a2857bb3 Add snapshots to the fast filesystem. Most of the changes support ... the gating of system calls that cause modifications to the underlying filesystem. The gating can be enabled by any filesystem that needs to consistently suspend operations by adding the vop_stdgetwritemount to their set of vnops. Once gating is enabled, the function vfs_write_suspend stops all new write operations to a filesystem, allows any filesystem modifying system calls already in progress to complete, then sync's the filesystem to disk and returns. The function vfs_write_resume allows the suspended write operations to begin again. Gating is not added by default for all filesystems as for SMP systems it adds two extra locks to such critical kernel paths as the write system call. Thus, gating should only be added as needed. Details on the use and current status of snapshots in FFS can be found in /sys/ufs/ffs/README.snapshot so for brevity and timelyness is not included here. Unless and until you create a snapshot file, these changes should have no effect on your system (famous last words).		2000-07-11 22:07:57 +00:00
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default_pager.c
device_pager.c
phys_pager.c	This is a cleanup patch to Peter's new OBJT_PHYS VM object type	2000-05-29 22:40:54 +00:00
pmap.h	Brucify the pmap_enter_temporary() changes.	2000-05-29 19:21:01 +00:00
swap_pager.c	Implement an optimization of the VM<->pmap API. Pass vm_page_t's directly	2000-05-21 12:50:18 +00:00
swap_pager.h
vm_extern.h
vm_fault.c	This is a cleanup patch to Peter's new OBJT_PHYS VM object type	2000-05-29 22:40:54 +00:00
vm_glue.c
vm_init.c
vm_kern.c	Implement an optimization of the VM<->pmap API. Pass vm_page_t's directly	2000-05-21 12:50:18 +00:00
vm_kern.h
vm_map.c	Fixed bug in madvise() / MADV_WILLNEED. When the request is offset	2000-05-14 18:46:40 +00:00
vm_map.h
vm_meter.c	Support for unsigned integer and long sysctl variables. Update the	2000-07-05 07:46:41 +00:00
vm_mmap.c	Nifty idea from Jeroen van Gelderen; don't call a routine to check if	2000-06-25 09:44:32 +00:00
vm_object.c	This is a cleanup patch to Peter's new OBJT_PHYS VM object type	2000-05-29 22:40:54 +00:00
vm_object.h	This is a cleanup patch to Peter's new OBJT_PHYS VM object type	2000-05-29 22:40:54 +00:00
vm_page.c	Simplify and rationalise the management of the vnode free list	2000-07-04 04:32:40 +00:00
vm_page.h	#elsif -> #elif	2000-07-11 09:41:29 +00:00
vm_pageout.c	Add snapshots to the fast filesystem. Most of the changes support	2000-07-11 22:07:57 +00:00
vm_pageout.h
vm_pager.c	Checkpoint of a new physical memory backed object type, that does not	2000-05-21 13:41:29 +00:00
vm_pager.h	Back out the previous change to the queue(3) interface.	2000-05-26 02:09:24 +00:00
vm_param.h
vm_swap.c	Separate the struct bio related stuff out of <sys/buf.h> into	2000-05-05 09:59:14 +00:00
vm_unix.c
vm_zone.c	Previous commit changing SYSCTL_HANDLER_ARGS violated KNF.	2000-07-04 11:25:35 +00:00
vm_zone.h
vm.h
vnode_pager.c	Add snapshots to the fast filesystem. Most of the changes support	2000-07-11 22:07:57 +00:00
vnode_pager.h