kib f16ea99007 The r241025 fixed the case when a binary, executed from nullfs mount, ... was still possible to open for write from the lower filesystem. There is a symmetric situation where the binary could already has file descriptors opened for write, but it can be executed from the nullfs overlay. Handle the issue by passing one v_writecount reference to the lower vnode if nullfs vnode has non-zero v_writecount. Note that only one write reference can be donated, since nullfs only keeps one use reference on the lower vnode. Always use the lower vnode v_writecount for the checks. Introduce the VOP_GET_WRITECOUNT to read v_writecount, which is currently always bypassed to the lower vnode, and VOP_ADD_WRITECOUNT to manipulate the v_writecount value, which manages a single bypass reference to the lower vnode. Caling the VOPs instead of directly accessing v_writecount provide the fix described in the previous paragraph. Tested by: pho MFC after: 3 weeks		2012-11-02 13:56:36 +00:00
..
default_pager.c	Replace pointer to "struct uidinfo" with pointer to "struct ucred"	2010-12-02 17:37:16 +00:00
device_pager.c	After the PHYS_TO_VM_PAGE() function was de-inlined, the main reason	2012-08-05 14:11:42 +00:00
memguard.c	Fix a bug with memguard(9) on 32-bit architectures without a	2012-07-15 20:29:48 +00:00
memguard.h	Fix a bug with memguard(9) on 32-bit architectures without a	2012-07-15 20:29:48 +00:00
phys_pager.c	Remove unneeded includes of <sys/linker_set.h>. Other headers that use	2011-01-11 13:59:06 +00:00
pmap.h	The page flag PGA_WRITEABLE is set and cleared exclusively by the pmap	2012-06-16 18:56:19 +00:00
redzone.c	Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.	2011-11-07 15:43:11 +00:00
redzone.h
sg_pager.c	After the PHYS_TO_VM_PAGE() function was de-inlined, the main reason	2012-08-05 14:11:42 +00:00
swap_pager.c	Whitespace cleanup.	2012-09-05 12:24:50 +00:00
swap_pager.h	Implement the linprocfs swaps file, providing information about the	2011-08-01 19:12:15 +00:00
uma_core.c	Const-ify the zone name argument to uma_zcreate(9).	2012-10-26 17:51:05 +00:00
uma_dbg.c
uma_dbg.h
uma_int.h	Const-ify the zone name argument to uma_zcreate(9).	2012-10-26 17:51:05 +00:00
uma.h	Const-ify the zone name argument to uma_zcreate(9).	2012-10-26 17:51:05 +00:00
vm_extern.h	Eliminate vm_phys_bootstrap_alloc(). It was a failed attempt at	2011-10-30 05:06:14 +00:00
vm_fault.c	Commit the actual text provided by Alan, instead of the wrong update	2012-10-24 18:32:37 +00:00
vm_glue.c	Move the corresponding MTX_SYSINIT() next to their struct mtx declaration	2012-10-26 17:31:35 +00:00
vm_init.c
vm_kern.c	Move what remains of vm/vm_contig.c into vm/vm_pageout.c, where similar	2012-07-18 05:21:34 +00:00
vm_kern.h
vm_map.c	- After r240026 sgrowsiz should be used in a safer maner.	2012-09-03 09:34:46 +00:00
vm_map.h	Fix a bug with memguard(9) on 32-bit architectures without a	2012-07-15 20:29:48 +00:00
vm_meter.c	- The previous commit (r228449) accidentally moved the vm.stats.vm.* sysctls	2011-12-14 13:25:00 +00:00
vm_mmap.c	Remove the support for using non-mpsafe filesystem modules.	2012-10-22 17:50:54 +00:00
vm_object.c	Remove the support for using non-mpsafe filesystem modules.	2012-10-22 17:50:54 +00:00
vm_object.h	- Add a comment explaining the locking of the cached pages pool held	2012-06-22 18:34:11 +00:00
vm_page.c	In general, we call pmap_remove_all() before calling vm_page_cache(). So,	2012-11-01 16:20:02 +00:00
vm_page.h	Rework the known mutexes to benefit about staying on their own	2012-10-31 18:07:18 +00:00
vm_pageout.c	In general, we call pmap_remove_all() before calling vm_page_cache(). So,	2012-11-01 16:20:02 +00:00
vm_pageout.h	Move what remains of vm/vm_contig.c into vm/vm_pageout.c, where similar	2012-07-18 05:21:34 +00:00
vm_pager.c	vm_pager_object_lookup: small performance optimization	2012-05-23 12:51:49 +00:00
vm_pager.h	Add new pager type, OBJT_MGTDEVICE. It provides the device pager	2012-05-12 20:49:58 +00:00
vm_param.h
vm_phys.c	Add a facility to register a range of physical addresses to be used	2012-05-12 20:42:56 +00:00
vm_phys.h	Add a facility to register a range of physical addresses to be used	2012-05-12 20:42:56 +00:00
vm_reserv.c	Correct an off-by-one error in vm_reserv_alloc_contig() that resulted in	2012-07-15 21:46:19 +00:00
vm_reserv.h	Introduce vm_reserv_alloc_contig() and teach vm_page_alloc_contig() how to	2011-12-05 18:29:25 +00:00
vm_unix.c	Control the execution permission of the readable segments for	2011-10-15 12:35:18 +00:00
vm_zeroidle.c
vm.h	Add new pager type, OBJT_MGTDEVICE. It provides the device pager	2012-05-12 20:49:58 +00:00
vnode_pager.c	The r241025 fixed the case when a binary, executed from nullfs mount,	2012-11-02 13:56:36 +00:00
vnode_pager.h	Account the writeable shared mappings backed by file in the vnode	2012-02-23 21:07:16 +00:00